JP2001122461A - Sheet feeding device and image processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet feeding device in which the sheet hitching amount to separator pawls can be kept approximately constant regardless of dispersion of the dimension across the sheet width and stabilize the sheet feeding performance of the devide effectively. SOLUTION: The arrangement according to the present invention comprises a cassette 103 in which a plurality of sheets 111 can be stacked, a reference guide member 201a to restrict one-side edges of the sheets 111 as reference and guide them, a side guide 205 to restrict the other side edges of the sheets 111 as non-reference side and guide them, a forefront hold-down spring 206 to energize the non-reference side of the sheet 111 toward the reference guide member 201a, separator pawls A207 and B208 to be engaged with the sheet corners downstream in the transporting direction for separating the sheets one by one, and a feed roller 112e positioned upstream of the pawls about the transporting direction for feeding the sheets one by one from the uppermost one, wherein the pawl B208 on the non-reference side is offset toward the reference guide member 201a for making approximately constant the hitching amounts of the two pawls A207 and B208 to the sheet 111.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding apparatus applied to an image processing apparatus such as a copying machine, a printer and a facsimile, and more particularly to a sheet feeding apparatus having a separation claw.

[0002]

2. Description of the Related Art Conventionally, as a sheet feeding apparatus applied to an image processing apparatus such as an ink jet printer, a sheet feeding apparatus using a separation claw as shown in FIG. 80 is generally known.

In this sheet feeding apparatus, the sheets S stacked on the sheet feeding stacker 1001 are always in contact with the reference guide member 1001a by the urging force of the side urging means 1002. In this state, the sheet S is fed by feeding means 1005 located on the upstream side in the transport direction of the separation claws 1003 and 1004. Due to the rotational driving of the feeding means 1005, the leading end of the sheet S first comes near the two corners thereof, and the abutting walls 1003a, 1003a of the separation claws 1003, 1004.
It hits 1004a. The sheet S is conveyed only in the central portion of the sheet S with both corners abutting on the separation claws 1003, 1004.
A loop is formed near 04. At this time, the feeding means 1
005 is made of a material (for example, rubber or the like) such that the coefficient of friction between the feeding means 1005 and the uppermost sheet S is larger than the coefficient of friction between the sheets S.
Only the top sheet S is conveyed by the feeding means 1005, and a loop is formed in the vicinity of both separation claws 1003 and 1004, thereby facilitating separation from the second and lower sheets S. When the feeding means 1005 continues to rotate further and the loop amount of the uppermost sheet S reaches a certain amount or more, the sheet ends are separated by the oblique sides 1003b, 1 of the separation claws 1003, 1004.
004b (a side inclined downward from the edge in the sheet width direction toward the center), the separation claw 1003
The sheet is transported to an image processing unit (not shown) downstream from the sheet 1004 in the transport direction. In this way, while keeping the resist in the width direction perpendicular to the conveyance direction constant by the side urging means 1002, the separation claws 1003, 100
4 feeds the sheet S without double feed.

[0004]

However, in the above conventional example, since the sheet S is pressed against the reference guide member 1001a by the side urging means 1002, there are the following problems.

The non-reference side surface of the sheet S is pressed against the reference guide member 1001a by the urging force of the side urging means 1002 and is always at a uniform position. The size of the sheet S may be changed by about 1 to 2 mm due to size variation at the time of cutting or expansion and contraction of the sheet S due to moisture absorption. Normally, the non-reference side surface of the sheet S abuts on the guide surface of the side regulating means 1006 and the amount of sheet hooking on the separation claw 1004 on the non-reference side is constant. Since the non-reference side surface of the sheet S is urged toward the sheet reference side by the side urging means 1002, the position of the non-reference side surface of the sheet S is shifted toward the sheet reference side by a variation, and the non-reference side separation claw 1 is displaced.
The sheet hooking amount to 004 is also reduced by the variation.
Then, the sheet S having the insufficient hooking amount causes double feeding due to the insufficient loop amount for separation, or the sheet S having the excessive hooking amount has a corner breakage of the sheet due to an increase in the nail pull-out resistance,
Misfeeds sometimes occurred.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and an object of the present invention is to always apply a sheet catching amount to a separation claw irrespective of a variation in a dimension in a sheet width direction. Is maintained substantially constant, and the feeding performance of the feeding device is effectively stabilized.

[0007]

In order to achieve the above object, a typical configuration of the present invention is to regulate a cassette on which a plurality of sheets can be stacked and a side surface in a width direction of the reference sheet. A reference guide member for guiding, a side guide for regulating and guiding the other side in the width direction of the sheet which is a non-reference side facing the reference side, and urging the non-reference side of the sheet toward the reference guide member side A side urging means, a separation claw that engages with both corners on the downstream side in the conveyance direction of the sheet and separates the sheets one by one, and the separation claw is positioned on the upstream side in the conveyance direction of the separation claw one by one from the top. Feeding means for feeding, in order to make the amount of hooking of the separation claw on the reference side and the separation claw on the non-reference side to the sheet substantially constant, the separation claw on the non-reference side is It is characterized by being installed offset to the reference guide member side That.

According to the above configuration, since the separation claw on the non-reference side is offset from the reference side, the dimension in the width direction of the sheet varies, and the non-reference side surface of the sheet is urged by the side urging means. Even if it is shifted to the reference side, the difference in the amount of hooking on the sheet between the separation claw on the reference side and the separation claw on the non-reference side is reduced, so that the sheet separation operation can be suitably performed, double feeding, skewing , Corner breakage, and paper jam can be effectively prevented.

Further, the offset amount of the non-reference side separation claw toward the reference guide member is smaller than the stroke amount of the side urging means toward the reference guide member side.

According to the above construction, the offset amount of the non-reference side separation claw to the reference side is smaller than the stroke amount of the side urging means. It is possible to prevent the hooking amount of the separation claw on the sheet from becoming excessively large, and reduce the difference in the hooking amount on the sheet between the separation claw on the reference side and the separation claw on the non-reference side. The same effect as the effect can be obtained.

Further, the side guide is a guide slidable in the sheet width direction and capable of regulating and releasing the position by engaging and releasing the corresponding latch means. The stroke amount to the reference guide member side is larger than the movement pitch amount of the side guide in the sheet width direction or the interval of the latch means.

According to the above construction, the stroke amount of the side urging means is larger than the movement pitch amount of the side guide in the sheet width direction or the interval of the latch means. Even if the side guide is misaligned by one click of the side guide movement pitch from the non-reference side of the seat due to a mistake,
The side urging means can urge the non-reference side surface of the sheet, press the reference side surface of the sheet against the reference guide member, and can always determine the position of the stacked sheets at a uniform position. Thus, even when the operator makes a mistake, the same effects as those described above can be obtained.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] Next, an embodiment of a recording apparatus to which the above-described means is applied will be described with reference to the drawings.

The present embodiment will be described using a serial type ink jet recording apparatus, and a recording apparatus using a detachable disposable type recording head as a recording head used in the recording apparatus will be described.

[Overall Configuration] FIG. 1 is an external perspective view of a recording apparatus, and FIG. 2 is a right sectional view showing a sheet conveying path of a recording sheet of the recording apparatus.

First, the basic configuration of the recording apparatus will be described with reference to FIGS.

In FIG. 1, reference numeral 101 denotes a base (bottom case), which together with the main case 102 constitutes a housing and a chassis of the main body of the recording apparatus.

Reference numeral 101a denotes an indicator for displaying the remaining amount of sheets, which displays the remaining amount of recording sheets stacked in the sheet cassette 103.

Reference numeral 102a denotes a selection switch, which is a device (computer or STB) for sending data to the recording apparatus.
Etc.) can be selected from two types of modes “A / B” corresponding to the specifications of “A / B”.

A recording sheet discharging section 102b is provided above the sheet feeding cassette 103, and a rib 102c (a sheet receiving rib) extending in the sheet discharging direction at the recording sheet discharging section is provided. The recording sheets are discharged along the (three) and the ribs 102d (two), and the recording sheets discharged thereafter are stocked on the recording sheets discharged earlier.

Reference numeral 201 denotes a base cassette,
03 is a base member, which is detachably attached to the main body of the recording apparatus, stacks a plurality of recording sheets in a paper cassette, and supplies the recording sheets to the recording apparatus by a paper feeding mechanism described later.
Separately supply each sheet.

An operation panel 104 includes a power switch 104a, a reset switch 104b, and a power display 10.
4d, data transfer display 104e, error display 104f,
And an ink remaining amount display for displaying the ink remaining amount for each of the black ink and the color ink.
04c are provided with the remaining amount display for black ink,
104g are provided for the color ink remaining amount display, and three display modes of "no light", "only one light", and "two light" are provided for each color in accordance with the amount of ink used. In the case where there are two types of tank capacities, the meaning of the display is made different depending on each capacity.

Note that the method for detecting the remaining amount of ink in the present invention employs the following method for each of color ink / black ink.
The total number of dots ejected by the recording operation or the recovery operation is counted, and the number of dots is detected by comparing with a preset total ink capacity value (total number of dots).

In the main case 102, a dot count reset key (not shown) for resetting the above-mentioned dot count at the position where the access cover 106 is opened is set to one for color / black.
When the ink tank is replaced and a new tank is used, the counter is reset by pressing the switch corresponding to the replaced tank. If it is turned off.

Reference numeral 105 denotes a paper discharge cover, which covers the above-described recording sheet discharge portion 102b where the recording sheets 111 discharged from the printer are stocked, and is detachably attached to the main case 102. Most of the area on the upper surface of the paper output cover 105 is substantially flat,
It is configured to be substantially flush with the upper surfaces of the main case 102 and other components.

As described above, the paper ejection cover 105 having a substantially flat upper surface area is detachably provided so that the entire upper surface of the device is substantially flat. It becomes possible to install other equipment on the flat part formed as a whole.

A plurality of ribs are provided on the back surface of the discharge cover 105 in the sheet conveyance direction. When the discharged recording sheet curls upward, the conveyance of the recording sheet is guided by the above-described rib. .

Reference numeral 106 denotes an access cover. When a disposable type recording head cartridge or ink tank according to the present embodiment is newly installed or replaced, the access cover 106 is unlocked by the access cover lock 107 and the access cover 106 is opened. To perform the replacement work.

The access cover 106 has a lever 106
is provided, and when the access cover 106 is opened, the lever of the cover switch 501 is turned on via the cover arm 500 rotatably attached to the printer unit to turn on the switch, whereby the access cover is opened. The open state is recognized, the carrier is automatically moved to the cartridge replacement position after the specified time has passed after the cover is opened, and the above-mentioned means that the access cover is closed is detected. In this case, there is a sequence for automatically moving the carrier to a prescribed position (home position or recovery operation position, etc.) (FIG. 2).
reference).

Reference numeral 108 denotes a manual feed cover. When a recording operation is performed on a sheet not conveyed from a paper feed cassette such as an envelope or a postcard, the manual feed cover 108 is opened to expose a manual feed opening 102 e of the main case 102. The sheet 111 is inserted into the recording position from the manual feed slot 102e.

In this case, the recording sheet to be manually fed is supported from below by a plurality of ribs provided on the back surface of the manual feed tray and guided to the paper feed port. Reference numeral 108a denotes a manual feed sub-tray, which is stored in a folded state when the manual feed tray is closed, and is held to assist the length of the manual feed tray when the manual feed tray is open, thereby supporting sheet insertion.

Reference numeral 114 denotes a sheet passing guide, which is a member constituting a recording sheet conveying path described later, and is attached to the printer unit 600.

Reference numeral 502 denotes a flapper, which is a sheet passing guide 11.
4 and guides the sheet to a sheet insertion portion of the printer unit 600 at the time of manual sheet feeding described later (see FIG. 2).

Reference numeral 109 denotes a U-turn cover, which is a member constituting a recording sheet transport path described later, and which is used when a recording sheet is jammed in the recording sheet transport path for some reason (at the time of a jam). This is used when taking out the jammed recording sheet by opening 109.

Reference numeral 110 denotes a paper discharge tray, which prevents the recording sheet from dropping from the apparatus main body (front side) when the recording sheet discharged from the printer unit is discharged to the above-described recording sheet discharge section 102b. It is a sheet support (auxiliary) member for normal use, and is normally housed in the apparatus main body, but is pulled out from the main body as needed and used (see FIG. 2).

[Recording Sheet Conveying Path] The sheet conveying path in the recording apparatus according to the present invention will be described with reference to FIG. In the present invention, there are two methods of sheet feeding means, a "sheet feed cassette" and a "manual feed".

First, the recording sheet transport path by the paper feed cassette will be described.

In FIG. 2, reference numeral 111 denotes a stacked recording sheet, which is mounted at a predetermined position of the paper feed cassette 103, and holds the recording sheet upward below the stacked recording sheet 111. A pressure plate 202 as a member is rotatably attached to the sheet cassette, and is urged upward by a pair of pressure plate springs 203. A pair of separation claws 207 and 208 are installed near the paper outlet of the paper feed cassette so as to cover the uppermost corner of the recording sheet 111 on which the stacked sheets are stacked.

Reference numeral 112 denotes an ASF (Auto Sheet Feed) unit, which plays a role of separating and transporting the uppermost one of the recording sheets stacked on the sheet cassette to the printer unit 600.

The details of the ASF unit 112 will be described later.

In the ASF unit 112, 112e
Reference numeral denotes a paper feed roller as a feeding unit, which separates and conveys only the uppermost recording sheet of the stacked recording sheets 111. 112a and 112b are guide surfaces that constitute a paper feed path, and guide the paper feed path with a guide rib 109a that constitutes a paper feed path installed on the U-turn cover 109 and a guide rib 114b that is installed on the paper feed guide 114. Make up.

The above-mentioned path has a substantially U-turn path, and the sheet is conveyed in a direction in which one sheet is taken out of the cassette and conveyed away from the printer unit, but is formed by the guide surface and the guide rib. The transport direction is turned by approximately 180 degrees with a smooth curvature by the substantially U-turn-shaped paper feed path, and the recording sheet is transported toward the recording start position in the printer unit.

The sheet conveying path ahead of the U-turn path is constituted by a guide surface 114a provided on the sheet passing guide 114 and a rib 622b provided on a platen 622, and guides the sheet to a paper feed roller.

In the ASF unit 112, 112d
Is a U-turn roller, and a U-turn pinch roller 113 rotatably attached to the base is urged against the U-turn roller 112d by an appropriate spring force, and rotates following the rotation of the U-turn roller 112d, Navigate and transport the recording sheet.

The recording sheet 111 is placed in the sheet cassette 103.
Are loaded into the main body of the recording apparatus, and AS
By rotating the sheet feeding roller 112e installed in the F unit 112 in the CCW direction in the figure according to a preset sequence, the recording sheet located on the uppermost surface of the plurality of stacked sheets is set in the sheet feeding cassette 103. Separated claw 2
At the same time, only one sheet is separated by 07 and 208, and sheet conveyance is started at the same time.

The details of the paper feed cassette 103 will be described later.

The recording sheet 111 separated from the paper feed cassette 103 is further conveyed by the above-mentioned paper feed roller. When the recording sheet 111 reaches the U-turn roller 112d, the recording sheet 111 is conveyed by the above-mentioned U-turn roller 112d and U-turn pinch roller 113. Then, the recording sheet 111 is conveyed to an LF (paper feed) roller 620 rotatably attached to the printer unit 600 via the U-turn paper feed path.
At this time, the flapper 502 is flipped up by the recording sheet to open the recording sheet transport path.

The pinch roller 625 rotatably attached to the printer unit 600 is urged by the paper feed roller 620 by an appropriate spring force.
The recording sheet that rotates following the rotation of 0 and reaches the paper feed roller is nipped and conveyed.

Reference numeral 626 denotes a paper discharge roller (two rows), which is a spur 6 rotatably mounted on the printer unit 600.
28 have respective spring rollers 626 by appropriate spring force.
And is rotated by the rotation of the paper discharge roller 626 to convey the recording sheet by nipping.

The details of the printer unit 600 will be described later.

The recording sheet 111 conveyed by the above-mentioned paper feed roller 620 is moved by the above-mentioned paper discharge roller 626 to a position E in FIG.
The sheets are discharged further along the ribs 102c and 102d, which are the above-described discharge receiving ribs, and the sequentially discharged sheets are stocked on the previously discharged sheets. You.

The recording sheet conveying path by the above-described series of sheet feeding cassettes is represented by a two-dot chain line 503 (see FIG. 2).

Reference numeral 629 denotes a paper sensor which is used as a means for detecting the position of the leading end of the recording sheet. The lever is pulled up by the leading end of the recording sheet 111 conveyed by the feed roller 112e and the U-turn roller 112d. After the arrival of the recording sheet 111 is detected and the sensor is detected, the recording sheet 111 is set at the recording start position by conveying the recording sheet 111 by a specified amount.

Reference numeral 604 denotes a carrier, on which a recording head cartridge 601 is detachably mounted, and the recording head cartridge 601 has a replaceable color ink tank 603a and a black ink tank 603b mounted thereon, and the carrier 604 has a guide shaft 606. And a guide rail 607 so as to reciprocate in the main scanning direction.

The details of the carrier will be described later.

Next, a description will be given of a recording sheet conveyance path by manual feeding.

In the case of manual feed, the manual feed cover 108 is opened, and a recording sheet is inserted from the manual feed slot 102e.
The sheet is pushed through the sheet path formed by the guide surface 114 a provided on the sheet passing guide 114 and the rib 622 b provided on the platen 622 until the leading end of the sheet comes into contact with the sheet feed roller 620.

At this time, the flapper 502 is grounded by its own weight to a predetermined position on the platen, and supports the insertion of the recording sheet from below.

When the sheet collides with the paper feed roller 620, the paper sensor 629 installed in front of the paper feed roller 620 is turned on to detect that a recording sheet has been inserted. Roller 6
After the recording sheet is conveyed by a predetermined amount by driving the recording sheet 20 and rotating it by a predetermined amount, the paper feed roller is then rotated in the reverse direction to convey the recording sheet in the reverse direction (upstream direction) and set the recording sheet at the printing start position.

In this series of operations, it is confirmed that the recording sheet has been reliably conveyed by the paper feed roller by detecting ON of the paper discharge sensor 630 attached downstream of the paper feed roller. If not, it is determined that the recording sheet is in an error state in which the recording sheet is not properly set, and a prescribed error process is performed, thereby preventing ink smearing that may occur when printing is performed on a place other than the recording sheet.

Particularly, when a recording sheet having a short dimension (for example, a postcard) is manually inserted, the rear end of the sheet is completely inserted into the manual insertion slot at the time of paper feeding (forward direction) for confirming the sheet insertion described above. However, when the recording sheet is conveyed in the reverse direction, the rear end of the sheet is inserted into the manual feed slot 1 by the slope of the flapper.
In this configuration, the sheet is guided in the 02e direction to avoid a jam that may occur when the rear end of the sheet enters an irregular portion such as the U-turn path described above.

The above-described recording sheet conveyance path by a series of manual feeds is represented by a two-dot chain line 504 (see FIG. 2).

The recording operation after the recording sheet is set at the print start position is the same as that at the time of cassette feeding.

Hereinafter, each unit will be described in detail.

[Base / Discharge Tray] When the discharge tray 110 is pulled out as shown in FIG. 2, the tray slide surface 101o of the base 101 and the rib 102h of the main case 102 hold the discharge tray 110, and the play in the rotation direction is regulated. Also, the discharge tray 1 is attached to the tray stopper 101p of the base 101.
The ten hooks 110a are engaged to prevent the pull-out direction from coming off. When the paper discharge tray 110 is in the housed state, the convex portion 110b (see FIG. 3) of the paper discharge tray 110 engages with the latch 102i attached to the main case 102,
Fixed. The user once pushes the front surface of the discharge tray 110 to release the engagement with the latch, and pulls the discharge tray 110 to a predetermined position (the position in FIG. 2).

FIG. 13 shows the base 101 and the paper discharge tray 110.
It is sectional drawing which shows the slide part of. The discharge tray 110 is provided with a rib 110c so as to sandwich a tray slide surface 101o provided on the base 101. Here, at least one of them is designed so as to have as little a gap as possible, so that the play of the discharge tray 110 with respect to the base 101 is eliminated. The tray slide surface 101
A slide rib 110d is provided between the above-described ribs 110c so as to abut on the upper surface of the sheet ejection tray 1c.
At the time of pulling out 10, the part always contacts and slides.

[Base / Components] FIG. 3 shows the main case 1
FIG. 2 is a perspective view showing internal components in a state where an upper housing such as 02 is removed. Here, the printer unit and the ASF unit (not shown) incorporated in the base 101 are actually removed. On the lower surface of the center of the base 101, a sheet cassette 1 on which recording sheets 111 are stacked
03 is provided, and the base 10
Reference numeral 1 denotes a surface 101b that covers the upper surface of the sheet cassette 103.

The main board 302 for controlling the printer is similarly attached to the metal component PWB chassis 303 with the mounting surface covered by the metal component PWB guard 304.
It is fixed to the base 101. The PWB guard 304 prevents the spread of fire on a housing such as the base 101 against ignition of a capacitor or the like on the main board 302. Further, since the main substrate 302 is surrounded together with the PWB chassis 303, the main substrate 302 also has a shielding effect of suppressing noise emitted from the main substrate 302.

Main board 302 and cable (not shown)
Is fixed to the base 101 with the mounting surface thereof facing the front of the apparatus main body 100.

A lock nut 306 having a female screw is press-fitted into the rear portion of the base 101 so that the main case 10
By being fastened with 2 and a screw, the engagement of both is strengthened.

At the back side in the insertion direction of the sheet cassette 103,
A path for reversing the transport direction of the recording sheet 111 is provided. A plurality of guide ribs 10 provided on the base 101
1g and a plurality of guide ribs 109a similarly provided on the U-turn cover 109 form a path. Since the guide ribs 101g and 109a are alternately arranged in the direction orthogonal to the traveling direction of the recording sheet 111, the recording sheet 111 is transferred between the two parts without being caught, thereby enabling smooth conveyance. . The U-turn cover 109 has a shaft 101b provided on the base 101 as described later.
It is supported rotatably. Therefore, the recording sheet 11
Even if a trouble such as 1 is left in the conveyance path, the user can easily remove the sheet because the part of the conveyance path described above is opened by rotating the U-turn cover 109. It has become.

A U-turn pinch roller 113 is arranged in this transport path. U-turn pinch roller 113
Is freely rotatable with respect to a pinch roller shaft 305 which is a close contact spring, and since the shaft itself is a spring, an appropriate pressure is always generated when the U-turn roller 112d is pressed.
The stable conveyance of the recording sheet 111 is realized.

The cassette supporting surface 1 for supporting the rail 201d of the cassette 201 is provided on both sides of the cassette 201 mounting portion.
01q is provided. The cassette support surface 101q
A tapered surface 101r is provided at the tip of, so that the cassette 201 can be easily inserted (see FIG. 14).

[Holding of Base / Cassette] As shown in FIG. 3, the base 101 incorporates a torsion coil spring and a cassette side retainer 307 for preventing the cassette 103 from dropping off and for urging it to the printing reference.

FIG. 4 is a plan view (partially perspective view) showing a state where the cassette 103 is mounted on the base 101. The cassette side retainer 307 has two arms, a fixed end 307a regulated by the base 101 and a free end 307b protruding so as to abut the cassette 201. Free end 307
Since b is bent when the cassette 201 is attached and detached and a moderate click feeling is given, the user can surely recognize that the cassette 201 is mounted at a proper position. When the cassette 201 is mounted at a proper position, the reference side surface 201i of the cassette 201 is urged by the cassette side presser 307 toward the cassette abutting reference surface 101m of the base 101. Here, the cassette 201
Of the paper feed cassette by engaging the concave portion 201h provided on the base 101 with the cassette click convex portion 101n provided on the base 101, and engaging the cassette side retainer 307 with the concave portion 201l provided on the side wall of the cassette 201. 1
03 is held without dropping from the base 101.

[Base / Back and Quick Sheet] FIG. 5 is a view showing the back of the apparatus main body 100. Ribs and rubber foot positioning convex portions 101 formed in a square shape on the base 101
A rubber foot 315 is attached inside i. In the installed state, the rubber feet 315 support the apparatus main body 100,
Apart from that, dummy feet 101l are arranged at various places. The dummy foot 101l is formed lower than the rubber foot 315 and is not normally grounded. However, when a load is applied to the apparatus main body 100, it is grounded to prevent deformation of the apparatus main body 100. On the back side of the front surface of the base 101, pull-out clues 101j are formed on both sides, so that the base 101 can be easily pulled out to the front. The transport cue 101 is located substantially at the center of gravity of the apparatus body 100 in the front-rear direction.
k is provided with a certain space so that the hand can easily enter.

At the rear of the base 101, a U-turn cover 1 is provided.
09 is provided, and the shaft 101b of the U-turn cover 109 is rotatably supported.

A quick sheet 316 as a simple manual is rotatably held by using two rubber feet 315 disposed in front of the base 101. The rotation hole 316a provided in the quick seat 316 is attached to one of the rubber feet 31.
5 (right side in the figure) and rotate around here. A quick seat 316 is provided on the other rubber foot 315 (left side).
Cue part 316b abuts and regulates rotation. For this reason, the clue part 316 of the quick sheet 316
5B, the cue portion 316b always projects to the outside as shown in the figure without entering the back from the state of FIG. 5, so that the user can rotate the quick seat 316 in the direction of the arrow 316d to easily pull it out. Become.

FIG. 6 is a rear view showing a state in which the quick sheet is rotated and pulled out. After a certain amount of rotation, the stopper 316c of the quick seat 316 abuts on the left rubber foot 315 to restrict the rotation.

[Explanation of the mechanism for detecting and displaying the remaining amount of the base sheet] FIG. 7 is an exploded perspective view showing the structure of the remaining sheet detection and the display unit. The same portion includes a lever 309 for detecting the remaining amount of the recording sheet 111, a drum 310 for displaying the remaining amount of the recording sheet 111, a tension spring 313 connecting the lever 309 and the drum 310, and a lever 309 for connecting the lever 309 to the cassette 20.
It comprises a cam 311, which operates and retracts in accordance with the insertion and removal of 1, a torsion coil spring 312 for urging the cam 311, and a frame 308 which holds these components. The lever 309, the drum 310, and the cam 311 are rotatably held, respectively, and one shaft ends 309f, 311e of the lever 309 and the cam 311 are held by bearings 101c, 101d provided integrally with the base 101, respectively.

The arm 309a is provided on the lever 309, and the lever 309 is rotated downward from the hole 101e of the base 101.
The recording sheets 111 protruding and stacked on the cassette 201
To come into contact with the upper surface. This rotation is performed by the gear 31 provided on the drum 310 through the gear 309b.
0b. Similarly, a cam portion 309d is provided integrally, and abuts on the cam 311 to restrict the rotation of the lever 309.

Outer peripheral surfaces 310c, 310d of drum 310
Are painted in different colors. In this embodiment, the outer peripheral surface 310d is white and the outer peripheral surface 310c is dark. There are no particular restrictions on this color arrangement, and various colors (however, in the present embodiment, the outer peripheral surface 3
10d is white) or one of them is a drum 310
It is easily conceivable that the use of the material colors described above is effective in reducing printing costs.

The indicator portion 101 a for displaying the remaining amount of sheets provided on the base 101 is covered with a display window 314 formed of a transparent material.
0c and 310d can be visually checked and confirmed, and at the same time, foreign substances are prevented from entering the inside.

The cam 311 is provided with a first cam portion 311a and a second cam portion 311b. The first cam portion 311a protrudes downward from a hole 101f provided in the base 101. When the cassette 201 is mounted, the cam 3 is formed by a step 201x provided on the side wall of the cassette 201.
The whole 11 rotates. Second cam part 3
Reference numeral 11b abuts on a cam portion 309d provided on the lever 309 in the assembled state. A torsion coil spring 312 is attached to the cam 311 and is urged in a direction for restricting the rotation of the lever 309 as described later.

FIG. 8 is a cross-sectional view (partially transparent view) showing the state of the lever 309 and the cam 311 when the cassette 201 is not mounted and when the cassette 201 is being mounted.
The cam 311 is urged in the direction of arrow 311f by the above-mentioned torsion coil spring 312. Therefore, the cam portion 309 of the lever 309 is formed by the second cam 311b of the cam 311.
d is pressed, and rotation of the lever 309 to the arrow 309g is restricted. That is, when the cassette 201 is not mounted, the arm 309a of the lever 309 does not protrude downward and retreats into the base 101 (above the surface 101b), so that the arm 309a is protected from breakage and the like. This posture is maintained even during the mounting of the cassette 201 so that the mounting of the cassette 201 is not hindered. The cam portion 309d of the lever 309 and the cam 311
The second cam portion 311b is located at a position where it does not actually protrude from the surface 101b of the base 101, that is, at a portion where there is no surface 101b in both axial directions.

FIG. 9 is a cross-sectional view (partially transparent view) showing a state of the lever 309 and the cam 311 when the cassette 201 is completely mounted on the printer main body. Paper cassette 10
The first cam 311a of the cam 311 is pushed by the step 201x provided on the side wall of the cam 311.
It rotates in the opposite direction to f. Thereby, the second cam 311
The cam portion 309d of the lever 309 pressed by b
Is free, and the lever 309 rotates in the direction of the arrow 309g by the tension of the tension spring 313, and its arm 309
a comes into contact with the upper surface of the sheet 111, and the sheet remaining amount detection mechanism operates. Here, arm 3 of lever 309
The contact portion 09a of the recording sheet 111 with respect to the recording sheet 111 is set on a plane that does not depend on the operation of the pressure plate 202, as shown in FIG. Is not transmitted to the lever 309, so that the drum 310 associated therewith is not affected by the movement of the pressure plate 202.

FIGS. 10 to 12 are side sectional views showing the operation of detecting the remaining amount of sheets by such a configuration, and FIG. 10A is a view showing a display state of the remaining amount of sheets at that time. First, FIG. 10 shows a state where the cassette 201 is not mounted. In FIG. 10B, the lever 309 is connected to the cam 31.
1, the rotation is restricted to a position where the arm portion 309a does not protrude downward from the upper surface 101b of the base. Lever 30
A tension spring 313 is hung on the spring hook portion 309c of No. 9 and a force rotating in the direction of the arrow 309g is applied. Therefore, while the rotation is restricted by the cam 311, the lever 309 is urged in the direction of the arrow 309 g by the extension spring 313 to maintain a stable posture.

The other end of the tension spring 313 is also hooked on the spring hook 310a of the drum 310, and is urged in the direction of the arrow 310f. Drum 310
The rotation of the edge 310e is restricted by a stopper 308d provided on the frame 308. As a result, similarly to the lever 309, it is urged to one side and can maintain a stable posture. Also, by holding at this position, when a lever 309 described later rotates, the gear portion 309 b and the gear portion 310 of the drum 310 are surely rotated.
b can be engaged at a regular position. Since the gear portion 309b of the lever 309 and the gear portion 310b of the drum 310 are prevented from meshing with each other when the sheet remaining amount detection mechanism is not operating,
Compared to a case where the two gears are always meshed with each other, the gears of the two gears can be minimized, so that the material cost can be reduced, and the space for the rotation of the gears can be reduced.

The remaining sheet display in this state is shown in FIG.
As shown in (a), a white outer peripheral surface 310d is displayed on the whole.

FIG. 11 shows a case where the cassette 201 is mounted and the recording sheet 111 is present. The arm 309a of the lever 309 as shown in FIG.
Is shown in a perspective view. As described above, since the cam 311 is retracted by mounting the cassette 201, the regulation of the lever 309 is released and the tension spring 31 is released.
The lever 309 rotates in the direction of the arrow 309g by the tension of 3, and stops when the arm 309a contacts the upper surface of the recording sheet 111. The gear 309b of the lever 309 meshes with the gear 310b of the drum 310, and both rotate in conjunction with each other. Drum 310 rotates in the direction opposite to arrow 310f.

The remaining sheet display in this state is shown in FIG.
As shown in (a), the rotation of the drum 310 causes the outer peripheral surface 310d of the white color to be hidden, and the outer peripheral surface 310c of the dark color to begin to be seen. Here, if many recording sheets 111 are stacked, the rotation amount of the lever 309 is small,
Therefore, since the rotation amount of the drum 310 is small, the white outer peripheral surface 310d is largely exposed. When the number of recording sheets 111 decreases, the rotation amount of the lever 309 increases, and the rotation of the drum 310 also increases, so that the white outer peripheral surface 310d decreases. Recording sheet 111
Indicates that the recording sheet 11 is mainly white.
Since the white outer peripheral surface 310d of the drum 310 in the indicator portion 101a decreases with the decrease of 1,
It is easy to recognize intuitively.

FIG. 12 shows a state in which the cassette 201 is mounted and the recording sheet 111 does not exist. As in FIG. 11, the state of the arm 309a of the lever 309 is shown in a perspective view in FIG. The cassette 201 has a surface 201w which is one paragraph from the sheet stacking surface.
Is designed so that the arm 309a of the lever 309 enters. Therefore, the recording sheet 111
Changes in the amount of rotation of the lever 309 between the case where there is only one remaining sheet and the case where the recording sheet 111 has been used up.
Therefore, the change in the rotation amount of the drum 310 interlocking is naturally large, and the dark outer peripheral surface 310c of the drum 310 is surely exposed to notify the user that the recording sheet 111 is gone. In addition, by making the change in the rotation amount of the drum 310 large, the dark outer peripheral surface 310c of the drum 310 can be reliably connected to the indicator portion 101a of the base 101 even when, for example, the play at the time of mounting or the component tolerance is considered. It can be displayed on the whole.

Here, in the series of operations shown in FIGS. 10 to 12, the tension spring 313 is designed and arranged so as to always have tension. Gear part 309 of lever 309
Considering the case where the gear b and the gear portion 310b of the drum 310 mesh with each other, both are urged by the tension spring 313 in opposite rotational directions. In order to always rotate this system in a fixed direction, that is, in the direction of the arrow 309g shown in FIG. 11, in this embodiment, the spring hooking position of the tension spring 313 is set at a position far from the rotation center on the lever 309 side, and the tension spring 313 is used. On the other hand, the spring hook 309a is placed near the rotation center so that the generated moment becomes large and the moment generated on the drum 310 becomes small while the urging state is maintained in the drum 310 as shown in FIG. You have set. In other words, the tension spring 313 is designed to rotate the lever 309 in the direction of the arrow 309g and pull back the drum 310 at the same time, and to urge the entire system in one direction. .

[Paper Feed Cassette] FIG. 15 is an overall perspective view of a paper feed cassette 103 according to an embodiment of the present invention. FIG. 16 is an exploded perspective view of the paper feed cassette 103, and FIG.
7 is a plan view. Furthermore, FIG.
3 is a detachable perspective view of FIG.

The paper feed cassette 103 is configured to be detachable from the apparatus main body 100, and as shown in FIGS.
0, the cassette supporting surface 10 of the apparatus main body 100
Two substantially horizontal rails 201 slid and guided on 1q
d, 201e are provided. Cassette support surface 101
q has a tapered surface 101r near the front surface of the apparatus main body 100, and the downstream end of the cassette 201 in the transport direction (arrows in FIG. 17) of the rails 201d and 201e is guided by the tapered surface 101r. The operability at the time of insertion into the apparatus main body 100 is effectively improved. Also,
Tapered portions 201f and 201g are also provided at the downstream ends of the rails 201d and 201e in the transport direction, and the insertability of the sheet cassette 103 into the apparatus main body 100 is further improved.

The rail 201 is placed on the cassette support surface 101q.
When the lower surface of d and 201e is slid and the paper cassette 103 is inserted all the way, the sheets 111 stacked in the paper cassette 103 are warped upward or wavy due to the influence of temperature and humidity. The paper feed roller 112e
Etc. may come into contact. When the sheet 111 comes into contact with the sheet feeding roller 112e, the leading end of the sheet 111 is turned up, or the end of the sheet 111 is separated from separation claws A207 and B208, which will be described later.
In some cases, conveyance failure such as skew or paper jam may occur.
Therefore, as shown in FIG. 25, a notch 101 s partially free of the cassette support surface 101 q is provided near the paper feed roller 112 e on the cassette support surface 101 q of the apparatus main body 100. Since there is no cassette support surface 101q supporting the weight of the sheet cassette 103 in the notch 101s, the downstream end of the sheet cassette 103 in the transport direction is retracted by its own weight in a downward direction away from the sheet feeding roller 112e.

More specifically, when the paper feed cassette 103 is sliding on the cassette support surface 101q, the stacked sheets 11
The gap between the upper surface of the sheet feeding roller 112e and the sheet feeding roller 112e is H1 (see FIG. 25A).
01s, the sheet cassette 103 is retracted downward by its own weight, so that the gap between the sheet 111 stacked on the sheet cassette 103 and the sheet feeding roller 112e is widened to H2 (FIG. 25B). reference). Therefore, even when the sheets 111 stacked on the paper feed cassette 103 warp upward due to the influence of temperature and humidity, or become wavy, and the gap with the paper feed roller 112e disappears, By retreating the sheet feeding cassette 103 downward, the gap between the stacked sheets 111 and the sheet feeding roller 112e is increased, and the sheet 111 and the sheet feeding roller 112e which are warped upward or are wavy are formed. This effectively prevents the leading edge of the sheet 111 from being turned up, coming off from the separation claw A207 and separation claw B208, and double-feeding, skew, and paper jams.

The sheet cassette 103 once retracted downward in the notch 101s is guided by the tapered surface 101t in front of the cassette support surface 101w at the back of the notch 101s and returns to the original height again. Face 10
1q is guided to a predetermined position, and the mounting operation of the paper feed cassette 103 ends. The cassette support surface 101q and the cassette support surface 101w have substantially the same height, and also have a function of positioning the sheet cassette 103 in the height direction after the completion of the mounting (see FIG. 25C).

The paper feed cassette 103 is provided in the main body 1 of the apparatus.
The cassette side presser 307 is urged in the sheet reference direction, and the reference side surface 201i of the reference side rail 201d of the cassette 201 is brought into contact with the reference surface 101m of the apparatus main body 100. Positioning is being performed. At this time, the cassette side presser 30
7 is provided on the side wall of the cassette 201 corresponding to the recess 20.
11 are provided. A recess 201h is provided on the rail 201d on the opposite side of the recess 201l, and has a function of fitting with the protrusion 101n of the apparatus main body 100 to prevent the sheet cassette 103 from dropping after being mounted. Rail 201
A spacer 201n is provided in the vicinity of the upstream end in the conveyance direction of e, to effectively prevent rattling after the sheet cassette 103 is mounted. In addition, a hand grip 201m is provided on the front surface of the cassette 201 so that the operator can put his hand on the attachment / detachment of the sheet cassette 103, thereby effectively improving the operability when attaching / detaching the cassette.

The sheets 11 stacked in the cassette 201
A reference guide member 201a that regulates one end (reference end) in the width direction is provided. The reference guide member 201a is substantially in the same phase as the sheet reference of the apparatus main body 100 in the sheet width direction when the sheet feeding cassette 103 is mounted on the apparatus main body 100, and is a reference in the width direction of the sheets 111 stacked in the sheet feeding cassette 103. It has become. On the downstream side in the transport direction of the cassette 201, a sheet leading end abutting surface 201 for positioning the leading end of the sheet 111 when the sheet 111 is loaded.
b is provided. The sheet front end contact surface 201b is a surface substantially perpendicular to the guide surface of the reference guide member 201a, and the sheet 111 to be conveyed is moved upward by the sheet conveying path 503.
And a bank 201c formed of a slope for guiding to the outside.
The regulation of the trailing end of the sheet 111 is different between the A4 size sheet and the LTR size sheet. Seat 1 with rib 201v
11 The rear end is regulated. The rear end regulating rib 201v is vertically sized (2
97 mm) + α (variation of the sheet 111), and the rear end of the sheet 111 can be suitably regulated even if the size of the A4 size sheet varies. LTR
In the case of a sheet having a size, the rear end regulating plate 209 is raised, and the rear end of the LTR size sheet 111 is regulated by the guide surface 209a of the rear end regulating plate 209.

On the cassette 201, there is provided a pressure plate 202 for urging the stacked sheets 111 against a sheet feeding roller 112e disposed on the apparatus main body 100 facing the sheet 111. The pressure plate 202 is a pressure plate mounting shaft 201o, 2 of the cassette 201.
01p, and is always urged by a pressure plate spring 203 in the direction of pressing against the sheet feeding roller 112e. The surface of the pressure plate 202 is zinc-plated, and a separation sheet 204 for preventing double feeding of the sheet 111 is provided immediately below the sheet feeding roller 112e. Separation sheet 20
No. 4 is formed of artificial leather, and the friction coefficient μ2 of the surface of the separation sheet 204 is

Μ1 <μ2 <μ3

Μ1: sheet-to-sheet coefficient of friction (0.7
degree)

Μ2: Coefficient of friction between sheet and separation sheet (approximately 0.9)

Μ3: Coefficient of friction between sheet and sheet feed roller (approximately 2.0)

Is set.

The side guide 205 shown in FIGS.
Is a member that regulates the non-reference end of the stacked sheets 111. The cassette 2 is designed to cope with variations in each sheet size (A4, LTR), sheet cutting in the width direction, and the like.
01 is slidably provided in the sheet width direction. The regulation of the non-reference end of the sheet 111 is performed by bringing the guide surface 205e into contact with the non-reference end of the sheet 111. The operation unit 205b of the side guide 205 has a spring property,
A latch 205a is provided in a part of the sliding portion below the cassette 05b with the cassette 201. The latch 205a normally fixes the position of the side guide 205 in a state of being engaged with the corresponding latch 201q of the cassette 201 by the resiliency of the operation unit 205b, but the operation unit 205b is bent against the resiliency. To retract the latch 205a from the latch 201q to make the side guide 205 slidable in the sheet width direction.

The side guide 205 is provided with a tip pressing spring 206 as a side urging means, which constantly urges the loaded sheet 111 to the reference guide member 201a, and always loads the sheet 111 at a uniform position. can do. The stroke amount of the tip pressing spring 206 is determined by the latches 201q and 205a.
5 is set slightly larger than the fixed position interval (latch interval), so that even if the width of the sheet 111 varies in the cutting direction, the sheet 111 is effectively urged to the reference guide member 201a and loaded. Positioning of the sheet 111 in the width direction can be performed. Further, the front end pressing spring 206 installed in the main paper feeding cassette 103 has two pressing portions 206a and 206b on the upstream side and the downstream side in the transport direction.
The relationship between the pressing force of the tip pressing spring 206 is

The downstream pressing portion 206a (196m
N (20 gf)) <upstream pressing portion 206b (3
92 mN (40 gf)

It is assumed that: This is because when the pressing portion 206a on the downstream side in the transport direction of the tip holding spring 206 near the separation claw B208 urges the sheet 111 with a smaller number of stacked sheets, the leading end of the sheet 111 holds the tip holding spring 2
This is to effectively prevent the non-reference side end of the sheet 111 from coming off the separation claw B208 due to deformation such as bending or buckling due to the bias of No. 06.

The pressing portion 20 of the tip pressing spring 206
Reference numerals 6a and 206b denote guide surfaces 205 of the side guides 205 for the strokes of the pressing portions 206a and 206b when the sheets 111 are not stacked in the sheet feeding cassette 103.
e. In this state, the pressing portions 206a and 206b protruding from the guide surface 205e of the side guide 205 that regulates the non-reference end of the sheet 111 when the sheets 111 are stacked are obstructed, and the operability is deteriorated, the pressing portions 206a and 206b are damaged, and the stacking is performed. In some cases, a problem such as breakage of the non-reference end of the sheet 111 may occur. In the main paper cassette 103, an eave 205g is provided on the side guide 205 on the pressing portions 206a and 206b, and the guide surface 20g is provided.
By covering the pressing portions 206a and 206b protruding from 5e, problems such as deterioration in operability when stacking sheets are effectively prevented.

Then, on the downstream side in the transport direction of the reference guide member 201a, the separation portion 207a rotates the reference side separation claw A207 having a predetermined hook amount on the sheet 111 around the inner surface of the reference side wall of the cassette 201 by the shaft 201r. It is movably supported. The separation claw A207 shown in FIG.
By fitting with 1t, the play in the sheet width direction and the twist direction is suppressed, and the hooking amount of the separation portion 207a to the sheet 111 is always constant. The separation claw B208 on the non-reference side is provided on the shaft 205c on the downstream side in the conveyance direction of the side guide 205.
And are rotatably supported. The separation claw B208 shown in FIG. 23 suppresses the play in the sheet width direction and the twist direction by fitting the rib 205d of the side guide 205 and the groove 208b of the separation claw B208. The separation claw A207 and the separation claw B208 are respectively connected to the stopper 201.
s, the rotation angle is regulated by the stopper 205f, and the rotation is possible within a predetermined rotation angle. The separation portions 207a and 208a of the separation claw A 207 and the separation claw B 208
On the loading sheet 111 on the pressure plate 202,
It has a function of restricting the upper limit of the rotation of 2. Separating claw A20 due to restriction of stopper 201s and stopper 205f
7. The upper limit of the rotation of the separation claw B208 is
The pressure plate 202, the pressure plate 202
Upper stacking sheet 111, separation claw A207, separation claw B20
8 is set at a predetermined position where it does not come into contact with the paper feed roller 112e or the like of the apparatus main body 100.

Here, the reference end of the sheet 111 is pressed by the reference guide member 201a by the urging force of the tip pressing spring 206, and is always determined to be a uniform position.
7a is always constant, while sheet 1
The non-reference end of 11 is caused by variations in the size at the time of cutting the sheet, variations due to expansion and contraction of the sheet itself due to moisture absorption, variations in the way the operator sets the side guide 205, and the like.
The separation portion 208a of the separation claw B208 when the sheets 111 are stacked
In some cases, the amount of hooking on the surface may change. As shown in FIG. 26, the non-reference end of the normal sheet 111 abuts on the guide surface 205e of the side guide 205 and the hook amount on the separation claw B208 is W2. The non-reference end 111 is a tip holding spring 206
At the sheet reference side (in the direction away from the separation unit 208a)
, The non-reference end position of the sheet 111 is shifted toward the sheet reference side by ΔW, and the hook amount on the separation claw B208 is also reduced by ΔW to W1. The amount of hooking on the sheet 111 is changed between the separation claw A207 and the separation claw B208, and the sheet 111 having an insufficient hooking amount causes a double feed due to an insufficient loop amount for separation or an excessive hooking amount. The sheet 111 has an increased resistance to nail removal, and the sheet 11
In some cases, misfeeds such as corner breaks, skews, and paper jams occurred.

Therefore, in the present invention, the separation claw A2 on the reference side is used.
07 and the non-reference side separation claw B208 in order to make the hook amount of the separation claw B208 on the sheet 111 substantially constant.
208 is installed offset from the reference side. Specifically, in the present embodiment, the separation unit 20 of the separation claw B208 is used.
The hooking amount of the sheet 8a with respect to the sheet 111 is substantially equal to that of the separation claw A207 in the sheet conveyance direction, but the design value of the hooking amount in the sheet width direction is slightly smaller than that of the separation claw A207 in view of the above-described variation ΔW. (About 0.3 mm).

That is, the separation claw B208 on the non-reference side is slightly offset (about 0.3 mm in this embodiment) from the side guide 205 toward the reference side. In the present embodiment, this offset amount is specifically 0.3 m
The value of about m takes into account the variation in sheet size, the variation in expansion and contraction due to moisture absorption, and the like, and also considers the setting position of the side guide 205 which is most likely to vary. That is, since the movement pitch amount (latch interval) of the side guide 205 to which the separation claw B208 is attached in the sheet width direction is set to about 1 mm in the present embodiment, a maximum shift of about 1 mm occurs. This variation is reduced by offsetting the separation claw B208. Note that the above-described offset amount is appropriately set depending on the device configuration, and is not limited to the above-described value.

With this configuration, the difference in the amount of hooking on the sheet 111 between the separation claw A 207 and the separation claw B 208 is reduced irrespective of the above-described sheet variation, so that the separation operation of the sheet 111 can be performed appropriately. Feeding, skew, corner breakage, and paper jam can be effectively prevented.

Further, since the offset amount of the separation claw B208 to the reference side is smaller than the stroke amount of the tip pressing spring 206, even when the variation in the dimension of the sheet 111 in the width direction is small, the separation claw B208 can be applied to the sheet 111. This effectively prevents the hooking amount from becoming excessively large.

Further, since the stroke amount of the front end presser spring 206 is larger than the moving pitch amount of the side guide 205 in the sheet width direction or the interval between the latches 205a, when the operator loads the sheets 111 on the sheet cassette 103, Due to a mistake, the side guide 205 is moved one pitch less than the non-reference side of the sheet 111.
Even in the case where the outside is clicked, the front end pressing spring 206 can urge the non-reference side surface of the sheet 111 and the reference side surface of the sheet 111 is used as the reference guide member 201a.
, And the position of the stacked sheets 111 can always be determined to be a uniform position.
208, the difference in the amount of hooking on the sheet 111 can be reduced, and the separation operation of the sheet 111 can be suitably performed.

The rear end regulating plate 209 shown in FIG.
At b, it is rotatably fitted to the bearing 201u of the cassette 201, and the cam 209c allows the user to select one of two positions, that is, a state of being substantially horizontally tilted and a state of being substantially vertically raised.
As described above, when stacking A4 size sheets, the rear end regulating plate 209 is in a state where it is tilted substantially horizontally, and when stacking LTR size sheets, it is in a state where it is raised almost vertically.
The rear end portion of the LTR-sized sheet 111 is regulated by the guide surface 209a of the rear end regulating plate 209. With the rear end regulating plate 209 raised, the guide surface 209a is LTR size vertical dimension (279.4 mm) from the sheet front end abutting surface 201b.
+ Α (variation of the sheet 111) and LT
Even if the size of the R size sheet varies, the sheet 1 is suitable.
11 can be regulated.

[Pickup / separation operation] In the standby state,
The half-moon surface of the paper feed roller 112e is the stacked sheet 111.
It is in a substantially horizontal state. Further, the pressure plate 202 and the stacked sheets 111 on the pressure plate 202 are urged by the pressure plate spring 203 and receive a force in a direction of pressing against the sheet feeding roller 112e. However, the rotation of the pressure plate 202 is performed by the separation claw A207 and the separation claw B2.
08. At this time, there is a predetermined gap H1 between the half-moon surface of the feed roller 112e and the stacked sheets 111.

When the paper feed roller 112e starts rotating in response to the paper feed command, the arc-shaped outer peripheral surface of the paper feed roller 112e pushes down the pressure plate 202 and the sheet 111 on the pressure plate against the bias of the pressure plate spring 203. At this time, the sheet 111 on the pressure plate 202 is
A pressing force acts between the arc-shaped outer peripheral surfaces of 12e. Thereby, a frictional force is generated between the arc-shaped outer peripheral surface of the rotationally driven paper feed roller 112e and the uppermost sheet 111a. As described above, the feed roller 112e and the uppermost sheet 1
The coefficient of friction μ3 with 11a is the coefficient of friction μ1 between the sheets.
Therefore, the uppermost sheet 111a is conveyed in the rotation direction of the paper feed roller 112e by the frictional force.
At this time, the two corners of the top end of the uppermost sheet 111a are the abutting walls 207b and 208 of the separation claw A207 and separation claw B208, respectively.
c, the left and right sides of the uppermost sheet 111a form a substantially same loop as the central portion of the uppermost sheet 111a is conveyed, thereby promoting separation from the second and lower sheets 111, and the uppermost sheet 111a. When the loop reaches a predetermined amount or more, the sheet ends are separated by the separation claw A207 and the separation claw B20.
8 begins to slide along the oblique sides 207c and 208d, is pulled out from the separation claws A207 and B208, and is conveyed to the downstream side.

[ASF Unit] Next, referring to FIGS. 27 to 59, the ASF unit 112 which is a paper feed mechanism system will be described.
Will be described.

First, the schematic configuration of the entire ASF unit will be described.

FIGS. 27 to 30 show the configuration and appearance of the ASF unit. The ASF unit is housed and fixed in the device body. FIG. 27 is a front view, and FIG. 28 is a top view. A U-turn guide A403 and a U-turn guide B404 are screwed to the frame A401 and the frame B402. The paper feed shaft 405 and the cam shaft 451 are rotatably supported by the frame A401 and the frame B402. Separation roller rubbers 112c that rotate integrally with the paper feed shaft 405 are adhered to two paper feed roller portions of the paper feed shaft 405, and the two portions have the same cross-sectional shape. FIG.
28 is a right side view of the ASF unit as viewed in the direction of arrow B in FIG. 27. FIG. The ASF motor 406 has a frame A401
Are supported by the frame A401 by the motor flange retainer 408 integrally formed at two places, and the flange fastening projection 41 at the tip of the elastic portion 409 of the frame A401.
The hole of the motor flange is locked at 0. The ASF motor 406 is connected to the main circuit board. Reference numeral 407 denotes a bearing A, which rotatably supports a cam A 420 described later, and is fixed to the frame A 401. FIG. 30 is a left side view of the ASF unit as viewed from the arrow C in FIG. 27. The bearing B411 rotatably supports a cam B421 described later, and is fixed to the frame B402.
The bearing C413 rotatably supports the paper feed shaft 405,
And it is fixed to the frame B402.

FIGS. 31 to 33 show the guide A in the U-turn.
And the ASF unit from which the guide B in the U-turn is deleted. FIG. 31 is a front view, FIG. 32 is a top view, and FIG. 33 is a rear view. The pair of U-turn rollers 112d are fixed to the U-turn roller shaft 414, and rotate integrally with the U-turn roller shaft 414. The U-turn roller shaft 414 is rotatably supported at both left and right ends by a U-turn roller holder A 416 and a U-turn roller holder B 417, respectively. The U-turn roller holder A 416 is rotatably supported by the support shaft 418 of the frame A 401, and the U-turn roller holder B
417 is rotatably supported by a support shaft 419 of the frame B402.

FIG. 34 and FIG. 35 are D-
It is D sectional drawing and EE sectional drawing. In FIG. 34, 4
Reference numeral 22 denotes an up cam follower, and 423 denotes a down cam follower, both of which are integral with the U-turn roller holder A 416. Reference numeral 420a denotes a cam surface of the cam A420 which is driven to rotate by the ASF motor, and acts on the up cam follower portion 422 and the down cam follower portion 423,
U-turn roller holder A with support shaft 418 as the center of rotation
416 is rocked. In FIG. 35, reference numeral 424 denotes an up cam follower, and 425 denotes a down cam follower, both of which are integral with the U-turn roller holder B417. The cam surface 421a of the cam B421 acts on the up cam follower 424 and the down cam follower 425 to swing the U-turn roller holder B417 about the support shaft 419 as the center of rotation. Cam A420 and cam B421
Are connected by a cam shaft 451 and rotate integrally.
In this example, the camshaft 451 uses a metal pressed product having a U-shaped cross section. The cams A420 and B421 have the same cam shape and rotate in the same phase. The shape of the cam follower is the same for the left and right U-turn roller holders. In FIG. 34, reference numeral 450 denotes an ASF sensor described later, which is positioned with respect to the frame A401 and connected to the main circuit board.

Before describing the mechanical elements of each section, an outline of the sheet feeding operation of the present sheet feeding system will be described.

FIG. 36 to FIG. 39 show the F-
It is a block diagram in F section. The state progresses in the order of FIG. 36 to FIG.

FIG. 36 shows a state in which the sheet feeding cassette 103 is mounted on the apparatus main body and the sheet feeding is awaited. The cross section of the separation roller rubber portion is substantially semicircular, and a space is secured between the separation roller rubber portion and the upper surface of the stacking sheet. The inside of the paper feed path to the printer unit is the guide surface 112b of the
It is formed by the guide surface 112a of the in-turn guide B404 and the platen 622. Outside the paper feed path are the bank 201c of the paper feed cassette and the guide rib 101 of the bottom case.
The guide rib 109a of the g and U-turn cover 109, the guide rib 114b of the paper passing guide 114, and the guide surface 114a are formed. 36, the U-turn roller 112d is at a position separated from the U-turn pinch roller 113, and is retracted inside the guide surface 112b of the U-turn inner guide A403.

FIG. 37 shows that the sheet feeding operation is started and the sheet 111 is started.
a is picked up and sent to the paper feed path. The separation roller rubber 112c rotates in the direction of the arrow and contacts the sheet 111a to pick up the sheet 111a, and the U-turn roller 112d is pressed against the U-turn pinch roller 113 while rotating in the direction of the arrow. Due to the deformation reaction force of the pinch roller shaft 305, a conveyance force acts on the sheet that has reached the nip between the U-turn roller 112d and the U-turn pinch roller 113, and the sheet feeding operation further proceeds. Here, the drive reduction system is configured so that the peripheral speeds of the separation roller rubber 112c and the U-turn roller 112d are the same. The paper feed shaft 405 and the U-turn roller 112d continue to rotate for paper feeding, and when the paper feed shaft makes one rotation, only the U-turn roller 112d continues to rotate as shown in FIG. Thereafter, when a predetermined sheet feeding operation is completed in cooperation with the paper feed roller 620 of the printer unit, the U-turn roller 112d separates from the U-turn pinch roller 113 while rotating the paper in the direction of the arrow as shown in FIG. Then, the paper feeding mechanism system returns to the paper feeding waiting state in FIG. At this time, the sheet is released from the load on the upstream side of the printer unit. After that, when the printer unit performs a paper feeding and printing operation, almost no paper passing load so-called back tension remains in the ASF paper feeding system.
The sheet conveyance of the printer section is stabilized, and good recording performance is obtained.

Hereinafter, the mechanical components of each section will be described. Each mechanism description shows only relevant parts. The overall arrangement of the components is shown in FIGS.

First, the driving system of the paper feed shaft 405 will be described. FIG. 40 shows a gear train for driving the paper feed shaft 405. 415 is an ASF motor 40 which is a power source
6 is a pinion gear on the output shaft. Reference numeral 426 denotes a motor reduction gear rotatably supported by the frame A401, and an input gear 426a and an output gear 426b are integrally formed. Reference numeral 427 denotes a paper feed reduction gear rotatably supported by the frame A401. An input gear 427a, an output gear A427b, and an output gear B427c are integrally formed, and the output gear B427c is connected to the frame A40.
The rotation is transmitted to a sheet feeding idler gear 428 which is rotatably supported by the first roller. An ASF clutch 429 has an input gear 429a. When the pinion gear 415 rotates clockwise toward the drawing (hereinafter referred to as CW rotation), the input gear 429a of the ASF clutch 429 rotates CW, and the pinion gear 415 rotates counterclockwise toward the drawing (hereinafter referred to as CCW rotation). Then, the input gear 429a of the ASF clutch 429 rotates CCW.

Next, the swinging system of the U-turn roller holder A 416, that is, the operating system for the U-turn roller 112d to move in and out will be described. Left and right U-turn roller holder A4
The fact that the U-turn roller holder B 416 and the U-turn roller holder B 417 swing synchronously and in phase has been described above.

FIG. 42 shows the retracted state of the U-turn roller, and FIG. 43 shows the retracted state of the U-turn roller. FIG.
The gear train for driving the cam A420 will be described with reference to FIG. FIG. 42 (c) shows a gear train from the pinion gear 415 of the driving source to the feed reduction gear 427 via the motor reduction gear 426. FIG. 42 (b) shows the paper feed reduction gear 427.
4 shows a gear train from to a cam gear 433. FIG.
In (b), the output gear A 427 of the feed reduction gear 427
b is connected to the cam sun gear 430. The cam sun gear 430 is rotatably supported by the frame A401 on the same rotation shaft as the motor reduction gear 426. A cam planet gear A431 and a cam planet gear B432 are connected to the cam sun gear 430. Cam planetary gear A431
And the cam planet gear B 432 is formed by a cam planet holder 434 having the same rotation center as the cam sun gear 430.
It is held so as to be able to rotate integrally with the cam sun gear 430.
Reference numeral 435 denotes a cam planetary holder spring for applying a clamping load to the cam planetary gear A 431, which rotates the cam planetary holder 434 as the cam sun gear 430 rotates. The cam gear 433 includes a cam planet gear A43.
1 or the cam planet gear B432 is engaged.

FIG. 44 shows the phase relationship of the cam planet holder 434, the cam sun gear 430, the cam planet gear A431, the cam planet gear B 432, and the cam gear 433 in the direction of the rotation axis. 430a is a flange portion at the center of the face width of the cam sun gear 430. The cam gear 433 is formed integrally with the cam A420. Cam planetary gear A4
31 is a cam gear A43 in the right half of the cam gear 433 in the width direction.
3a, and the cam planet gear B432 can be connected to the left half cam gear B433b of the cam gear 433 in the width direction. The cam gear A433a is provided with a missing tooth portion A433c shown in FIG. 42 (b), and FIG. 42 (b) shows an HH cross section of FIG. FIG. 43 shows the cam gear B433b.
A missing tooth portion B433d shown in FIG.
FIG. 43 (b) shows a G section.

With reference to FIGS. 42 and 43, the swing of the U-turn roller holder A416, that is, the retraction and retreat of the U-turn roller 112d will be described. FIG.
2 shows a retracted state, and FIG. 43 shows a retracted state.

The retracting operation of the U-turn roller 112d is an operation until the state of FIG. 43 becomes the state of FIG. In the retracted state of FIG. 43, when the pinion gear 415 rotates CW, the drive system is sequentially driven to rotate in the direction of the arrow as shown in FIG. In FIG. 42, the cam planet gear A
431 drives the cam gear A 433a, and the cam 420
CW rotation causes cam surface 420a to move down cam follower 4
23, the U-turn roller holder A 416 is driven to rotate CW about the rotation shaft 418. The U-turn roller 112 d is pressed against the U-turn pinch roller 113. FIG. 42 shows that the cam planet gear A431 is the cam gear A.
433a is driven to the missing tooth portion A433c, and even if the pinion gear 415 continues CW rotation, the cam A42
0 indicates that the U-turn roller holder A 416 has a stable posture without being driven to rotate. Overcoming A4
Reference numeral 20b denotes a reverse taper portion of the cam surface 420a, which uses a reaction force from the U-turn pinch roller 113 to generate a cam A42.
It has the effect of slightly over-rotating 0. Cam planetary gear A
431 drives the cam gear A433a to the toothless portion A433c, and then drives the final gear A43 of the cam gear A433a.
This has the effect of preventing 3e from being hit by the teeth of the cam planet gear A431. Incidentally, reference numeral 434a denotes a planetary stopper which is a part of the cam planetary holder 434.
By contacting the stopper rib 436 provided on
The maximum rotation amount of the cam planet holder 434 is regulated.

That is, in FIG. 42, the planetary stopper 4
34a comes into contact with the stopper rib A436a, so that the cam planetary gear A431 is connected to the toothless portion A of the cam gear A433a.
In FIG. 43, the planetary stopper 434a abuts against the stopper rib B 436b to prevent the cam planetary gear B 432 from moving into the cam gear B 433c.
433b is prevented from being excessively sunk into the missing tooth portion B433d.

The retracting operation of the U-turn roller 112d is an operation until the state of FIG. 42 becomes the state of FIG. 42, the pinion gear 415 is in the CCW state.
When rotated, the drive system is sequentially driven to rotate in the direction of the arrow, as shown in FIG. In FIG. 43, a cam planetary gear B432 drives a cam gear B433b and a cam A420.
Is rotated CW, the cam surface 420a acts on the up cam follower portion 422, and the U-turn roller holder A 416 is driven to rotate CCW about the rotation shaft 418. And U
The turn roller 112d is separated from the U-turn pinch roller 113. FIG. 43 shows that the cam planetary gear B432 drives the cam gear B433b to the toothless portion B433d,
Even if the pinion gear 415 continues CCW rotation, the cam A420 is no longer rotationally driven, and the U-turn roller holder A4
16 shows a state in which the posture is stable. The overcam B420c is a reverse tapered portion of the cam surface 420a,
Utilizing the reaction force due to the weight of the U-turn roller 112d and the U-turn roller shaft 414, the cam A420 is slightly over-rotated. After the cam planet gear B432 drives the cam gear B433b to reach the toothless portion B433d, there is an effect of preventing the final teeth B433f of the cam gear B433b from being hit by the teeth of the cam planet gear B432.

Reference numeral 420d is a cam stopper integrated with the cam A420. At the time of the U-turn roller retracting operation, since the driving reaction force is weak only by the weight of the U-turn roller 112d and the U-turn roller shaft 414, the cam A420
And the U-turn roller holder A 416 may rotate excessively. At this time, the cam stopper 420d and the down cam follower portion 423 interfere with each other, thereby preventing excessive rotation of each other.

Next, the gear train related to the rotational drive of the U-turn roller 112d will be described. FIGS. 45 and 46
Shows a drive system for the U-turn roller 112d.

In both figures, the pinion gear 41 of the driving source is shown.
5 rotates through the motor reduction gear 426 to the frame A
U-turn reduction gear 449 rotatably supported by 401
Is transmitted to The U-turn reduction gear 449 is the input gear 44
9a and the output gear 449b are integrally formed. U
The rotation of the turn reduction gear 449 is transmitted to a U-turn sun gear 437 via a U-turn idler gear A412 having a cam A420 as a rotation axis. U-turn sun gear 437
Is the same rotation shaft 418 as the U-turn roller holder A 416
Are rotatably supported by the frame A401. U
The rotation of the turn sun gear 437 is performed by the U-turn planetary gear A4.
38 and the U-turn planetary gear B439. The U-turn planetary holder 442 is rotatably supported on the rotating shaft 418 about the same rotation center as the U-turn sun gear 437, and includes a U-turn planetary gear A438 and a U-turn planetary gear B.
439 is rotatably held. Reference numeral 443 denotes a U-turn planetary holder spring for applying a pinching load to the U-turn planetary gear B 439, so that the U-turn planetary holder 442 rotates as the U-turn sun gear 437 rotates. The U-turn idler gear B440 is rotatably supported by the U-turn roller holder A416. U
The turn roller gear 441 is a U-turn roller holder A4.
16 rotatably supported. U-turn roller shaft 4
14 is supported by the U-turn roller gear 441 so as to rotate integrally with the U-turn roller gear 441. As described below, the U-turn roller 112d always rotates in the CW rotation, that is, in the paper feeding direction, regardless of whether the pinion gear 415 is in the CW rotation or the CCW rotation.

FIG. 45 shows a driving state when the pinion gear 415 rotates in the CW direction. At this time, U-turn sun gear 43
7 and the U-turn planetary holder 442 rotate CW, the U-turn planetary gear A 438 bites into the U-turn roller gear 441, and rotates the U-turn roller 112d CW.

FIG. 46 shows a driving state when the pinion gear 415 rotates CCW. At this time, U-turn sun gear 4
37 and U-turn planet holder 442 rotate CCW
Turn planetary gear B439 is U-turn idler gear B44
0, and the U-turn roller 112d rotates CW.

Next, the structure and operation principle of the ASF clutch 429 and a lock mechanism for the ASF clutch 429 will be described. First, the ASF clutch 429 will be described, and based on this, the lock mechanism will be described below.

The structure of the ASF clutch 429 is shown in FIG. 429a is an input gear, and 429b is an output shaft. A clutch spring 429d is wound around the input gear 429a and the output shaft 429b. A release collar 429c is rotatably attached to the outside of the clutch spring 429d. The clutch spring 429d has one end 429h on the side wound around the input gear 429a.
Is engaged with the notch groove 429g of the release collar 429c, and the other end 429i of the other side wound around the output shaft 429b is engaged with the hole 429j of the output shaft 429b. The clutch spring 429d is wound so that when the CW rotation is input to the input gear 429a, the clutch spring 429d is tightened, and conversely, when the CCW rotation is input to the input gear 429a, the clutch spring 429d is loosened. That is, when there is a CW rotation torque input to the input gear 429a, the clutch spring 429d tends to tighten, and sufficient torque can be transmitted to the output shaft 429b. On the other hand, even if the input gear 429a receives a CW rotation or CCW rotation torque input, the input gear 429a can be idled without transmitting torque to the output shaft 429b. When the CW rotation is input, the locking portion 42 of the release collar 429c is used.
9e, the clutch spring 429d
A loosening action occurs at one end 429h of the motor, and only the input gear 429a idles. Further, when a CCW rotation is input, if a rotation preventing load is applied to the flange locking portion 429f of the output shaft 429b, the other end 429i of the clutch spring 429d is loosened and the input gear 42 is released.
Only 9a idles in the CCW direction. The output shaft 429b
The paper feed shaft 40 is rotated so as to rotate integrally with the paper feed shaft 405.
5 is attached.

Next, the lock mechanism of the ASF clutch 429 will be described with reference to FIGS. 47 to 50, the rotation phase of the paper feed shaft 405 is also shown.

FIG. 47 shows a stand-by state before the sheet pickup. In the immediately preceding operation, the pinion gear 415 has completed the CCW rotation. ASF lock 444 is for frame A40
The first lock pawl shaft 448 is rotatably supported by one lock pawl shaft 448. 4
44a is a lock claw integrated with the ASF lock 444,
In the standby state of FIG. 47, the flange locking portion 429f of the ASF clutch 429 is in contact. Reference numeral 444b denotes a lock elastic portion integrated with the ASF lock 444, and has a spring property in a direction perpendicular to the paper surface. The lock spring 445 is a torsion coil spring wound around the rotation shaft 444d of the ASF lock 444. One arm is locked to the frame A401, and the other arm is locked to the ASF lock 444. By the action of the lock spring 445, the ASF lock 44
4 is urged clockwise, ie, the lock pawl 44
4a is urged by the notch 429k of the output shaft 429b of the ASF clutch 429.

FIGS. 51 and 52 are enlarged views of a portion K in FIG. FIG. 51 shows the lock elastic portion 444b of the ASF lock 444, and FIG. 52 shows the U-turn roller holder A41.
No. 6 drive projection 447 is shown. In FIG. 51, reference numeral 446 denotes a driven projection integral with the lock elastic portion 444b, and has a driven ridge line 446a and a driven slope 446b. FIG.
In the drawing, reference numeral 447 denotes a drive projection integral with the U-turn roller holder A 416, and the drive slope 447a and the drive ridge 4
47b.

As described above, when the pinion gear 415 is
When the W rotation starts, the U-turn roller holder A 416 starts the CW rotation, and the input gear 4 of the ASF clutch 429.
29a starts the CW rotation, and this state is shown in FIG.

Driving projection 4 of U-turn roller holder 416
The ASF lock 444 is driven counterclockwise against the urging force of the lock spring 445 due to the interference between the ASF lock 446 and the driven protrusion 447 of the ASF lock 444. That is, the lock claw 444
a escapes above the notch 429k. as a result,
The output shaft 429b of the ASF clutch 429 is in a CW rotatable state. This will be described with reference to FIG. FIG.
3 is an enlarged view of a portion L in FIG. When the U-turn roller holder A 416 rotates in the direction of arrow I, the drive projection 447
Of the driven projection 446 is driven ridge line 446
A is pushed upward, and the ASF lock 444 is driven in the direction of arrow I.

When the pinion gear 415 further continues the CW rotation, the state shown in FIG. 49 is obtained. In this state, the feed shaft 40
5 is a pair of separation roller rubbers 112c which continue the CW rotation drive.
Picks up the sheets in the cassette. The U-turn roller holder A 416 and the ASF lock 444 are in a stable posture and do not operate. Since the lift-up process of the driven projection 446 by the driving projection 447 has been completed, the ASF
The lock 444 is rotatable clockwise by the urging force of the lock spring 445, and the lock claw 444a is
The posture is stable when it comes into contact with the flange portion outer periphery 429m of 29b.

When the pinion gear 415 further continues the CW rotation, the state shown in FIG. 50 is obtained. The input gear 429a of the ASF clutch 429 continues CW rotation.
05 completes one rotation stroke and no longer rotates, and the clearance between the separation roller rubber 112c and the sheet is secured. The feed shaft 405 does not rotate, that is, the output shaft 429b
Does not rotate because the lock claw 444a is locked to the locking portion 429e of the release collar 429c.
This is as described in the description of the ASF clutch 429. In this state, as described in FIG. 45, only the U-turn roller 112d is conveying the sheet. The state in FIG. 50 is continued until the predetermined sheet conveying operation is completed.

At the final stage of the sheet feeding operation, the pinion gear 415 rotates CCW to perform the retreating operation,
State 7 is reached. From the state of FIG.
When 5 rotates CCW, as shown in FIG. 47, the input gear 429a of the ASF clutch 429 rotates CCW, and the U-turn roller holder A 416 rotates CCW. At this time, the driving protrusion 447 and the driven protrusion 446 interfere with each other, but the interference load is absorbed by the elastic deformation of the lock elastic portion 444b, the ASF lock 444 does not rotate, and the lock claw 444a
Remains biased to the notch 429k.

FIG. 54 is a view taken in the direction of the arrow M in FIG. At the time of the evacuation operation, FIG. 54 (c) changes from FIG. 54 (a) through FIG. 54 (b).
State. When the U-turn roller holder A 416 performs the retreat operation from the state of FIG. 54A, the drive ridge 447b acts on the driven slope 446b as shown in FIG. 54B, and the lock elastic portion 444b is elastically deformed and escapes. When the retraction operation of the U-turn roller holder A 416 further proceeds and exceeds the interference area, the lock elastic portion 444 as shown in FIG.
b returns to the original state and reaches the state of FIG. On the other hand, even during these operations, the input gear 4 of the ASF clutch 429
29a continues CCW rotation. However, at this time, as shown in FIG. 47, since the flange locking portion 429f abuts on the lock claw 444a, the output shaft 429b does not rotate CCW by the above-described clutch mechanism. That is, the paper feed shaft 40
5 keeps the standby state without rotating. When the predetermined operation is completed, the driving of the ASF motor is stopped, and the evacuation operation is completed.

47 to 50, reference numeral 444c denotes a lock sensor plate integrated with the ASF lock 444.
It moves up and down by the rotation of the SF lock 444. 32 and 34 show the positional relationship between the lock sensor plate 444c and the ASF sensor 450. The ASF sensor 450 is a transmissive photosensor. In the standby state shown in FIGS. 34 and 47, the lock sensor plate 444c cuts off between the light emitting unit and the light receiving unit of the ASF sensor 450.
It is recognized that the sensor 450 is ON. When the lock claw 444a is located above and the output shaft 429b is in the unlocked state, as in the sheet pickup state of FIG. 49, the lock sensor plate 444c is located above the ASF sensor 450 and the ASF sensor 450 The light emitting part and the light receiving part are not blocked. At this time, the control logic recognizes that the ASF sensor 450 is OFF.

The above is the description of the mechanical elements of each part. Although the outline of the paper feeding operation has been described before the description of the mechanism elements, a state in which the mechanism elements perform the basic paper feeding operation in conjunction with each other will be described below.

FIG. 34 shows a standby state, which is an initial state, and corresponds to FIG. 36 for schematically describing the operation. When the sheet feeding command is executed, first, the ASF motor 406 starts normal rotation, that is, the pinion gear 415 starts CW rotation. U
The turn roller holder A 416 is released to the position shown in FIG. 42 by the cam A 420, and in the course of its operation, as shown in FIG.
The lock 444 is driven upward, and the lock claw 444a is released. The paper feed shaft 405 that rotates integrally with the output shaft 429b of the unlocked ASF clutch 429 rotates forward in the sheet pickup direction as shown in FIG. 49, and picks up a sheet in the paper feed cassette.

On the other hand, the U-turn roller 112d is
At the same time as being pressed against the U-turn pinch roller 113, the U-turn roller gear 441 rotates forward in the paper feed direction as shown in FIG. Subsequently, the ASF motor 406 rotates forward, and the U-turn roller 112d keeps rotating forward while maintaining the position in contact with the U-turn pinch roller 113. The feed shaft 405 continues to rotate forward, and the separation roller rubber 1
The sheet picked up by 12c reaches the nip between the U-turn roller 112d and the U-turn pinch roller 113. For a while, the sheet is conveyed by the separation roller rubber 112c and the U-turn roller 112d having the same paper feed speed.
This is the state shown in FIG.

Further, the ASF motor 406 continues to rotate forward,
The U-turn roller 112d continues sheet conveyance. The feed shaft 405 also continues to rotate forward, but after one rotation, as shown in FIG. 50, the lock claw 444a falls into a notch 429k provided on the output shaft 429b of the ASF clutch 429, and the locking portion of the release collar 429c. 429e is the lock claw 44
4a. Thereafter, even if the input gear 429a of the ASF clutch 429 rotates forward, the output shaft 429b does not rotate, the rotation angle phase of the paper supply shaft 405 is constant, and the separation between the separation roller rubber 112c and the sheet of the paper supply cassette. There is space between them. It is a state shown in FIG. 38 for the outline of operation.

Further, the ASF motor 406 continues to rotate forward,
The turn roller 112d keeps feeding the sheet, intermittently suspends the sheet conveyance to the printer unit 600, and stops the ASF motor 40 until the predetermined sheet conveyance is completed.
6 rotates forward. When the predetermined sheet conveyance is completed, the rotation of the ASF motor 406 is temporarily stopped.

Thereafter, the ASF motor 406 starts reverse rotation, and the pinion gear 415 starts CCW rotation. The U-turn roller holder A 416 is retracted to the position shown in FIG. 43 by the cam A 420, and in the operation process, as shown in FIG. 54, the driving projection 447 kicks the driven projection 446, and the ASF lock 444 Do not work. At this time, as shown in FIG. 46, the U-turn roller 112d rotates in the paper feed direction while rotating in the forward direction.
13, no back tension is generated on the sheet by the drive system. At the same time,
The input gear 429a of the ASF clutch 429 is rotating CCW, and tries to reverse the output shaft 429b in the paper reverse feed direction. At this time, as shown in FIG. 47, since the flange locking portion 429f is locked to the lock claw 444a, the output shaft 429b does not reversely rotate, and only the input gear 429a continues CCW rotation. The rotation angle phase of the paper feed shaft 405 is constant,
A space is provided between the separation roller rubber 112c and the sheet of the sheet cassette.

The ASF motor 406 stops after a predetermined amount of reverse rotation, and enters a standby state. It is a state shown in FIG. 39 for the outline of operation. In the standby state, as shown in FIG. 47, the lock claw 444a has fallen into the notch 429k of the ASF clutch 429, and even if the paper feed shaft 405 is rotated by some disturbance, the release collar 42
9c or the flange locking portion 429f of the output shaft 429b abuts against the lock claw 444a, and the paper feeding shaft 405 does not over rotate, and the phase is stable. The above is the description of the interlocking of the mechanism elements.

Next, the flow of the entire sheet feed control will be described with reference to the flowcharts of FIGS. FIG. 55, FIG. 56
57 shows a basic flow of automatic paper feed, FIG. 57 shows a forced paper discharge flow, and FIG. 58 shows a retreat flow of the U-turn roller. Note that these flows are performed by the CPU, the controller, and the R
This is realized by a main body control circuit including an OM, a RAM, and the like, and a block diagram will be described later. Hereinafter, the flow of the sheet feeding operation will be described.

First, the basic flow of FIGS. 55 and 56 will be described. When the automatic sheet feeding is started, first, the number of sheet feeding tries is initialized, and the first try is started (S10).
1). Then, the rotation amount counter of the ASF motor is reset. In this example, the ASF motor uses a stepping motor, and counts the number of drive pulses (S10).
2). The ASF motor is rotated forward to start the sheet feeding operation (S
103). The forward rotation is the rotation of the pinion gear CW at the time of explanation of the mechanical system. When the paper feeding operation is started, the state of the paper sensor is monitored (S104). The paper sensor 629 shown in FIGS. 2 and 36 to 39 is turned off when there is no sheet, and turned on when the sheet passes. As for the ASF motor, the paper sensor is turned off when the allowable driving amount P1 pulse set in advance is limited.
The normal rotation is continued until N is reached (S104, S107). If the paper sensor is turned on by the pulse of the permissible driving amount P1, the ASF motor is temporarily stopped and the process proceeds to the next sequence (S105). If the pulse counter value exceeds the P1 pulse while the paper sensor is OFF, the ASF motor is stopped (S108), and the evacuation sequence is executed (S1).
09).

The retreat sequence retreats the U-turn roller by reversing the ASF motor, and returns the drive system to the initial state. FIG. 58 shows the flow. The number of evacuation tries is initialized (S301), and the ASF motor is
Reverse the preset Pd pulse (S30
2). The reverse rotation is the rotation of the pinion gear CCW at the time of explanation of the mechanical system. If the ASF sensor is ON (S303), the evacuation operation is normal, the ASF motor is stopped (S306), the process ends, and the next sequence can be performed. If the ASF sensor is OFF, the evacuation retry is performed once (S303, S304, S305). Still AS
If the F sensor is not turned on, the sequence is terminated as a save error.

Returning to the description of FIG. 55, when the retraction sequence is completed (S109), a paper feed retry is executed once (S110, S111). If the paper sensor is not turned on even after the retry, the sequence ends as a paper feed error (S104, S107 to S111).

When the sheet is conveyed to the paper sensor and the paper sensor is turned on, the ASF motor is stopped (S105), and the registration operation is performed after the determination in S106. In S106, the pulse count value is compared with a preset slip feed determination reference value P2 to determine the degree of slip of the sheet. If it is determined that the sheet has been relatively smoothly conveyed, the flow shifts to FIG. 56B to perform registration taking into account the slippage. If it is determined that the sheet has been conveyed without slipping relatively, the flow shifts to FIG. 56A to perform normal registration. Each registration is performed by generating a sheet loop.

In FIG. 56 (A), first, the paper feed motor is reversed in the direction opposite to the sheet conveyance (S116), and the ASF motor is rotated forward to strike the sheet against the nip of the paper feed roller, thereby forming a sheet loop. It is generated (S117). Where A
The feed pulse number Pa of the SF motor is a pulse number set in advance to obtain a desired sheet loop amount. ASF
The motor is stopped (S118), the paper feed motor is stopped (S119), and the registration is completed.

In FIG. 56B, S112 to S115
At the cash register, but the flow of (A) is ASF
The number of forward rotation pulses of the motor is different. In S113, A
The number of normal rotation pulses of the SF motor is incremented to f pulses in consideration of the slipperiness of the sheet. The value obtained by dividing the feed amount count value actually required to the paper sensor by the preset theoretical feed amount P0 to the paper sensor is the slip increment rate. The value obtained by multiplying the increment rate by the loop generation pulse Pa during normal feeding is f. By incrementing to f pulses, an appropriate loop amount is secured.

Steps S120 to S125 are a sequence for leading the sheet to the printer unit and retracting the U-turn roller.
The ASF motor and the paper feed motor are driven synchronously.
In S120 and S123, the ASF motor and the paper feed motor start driving at the same time so that the U-turn roller and the paper feed roller rotate forward at the same rotation speed and the same paper feed amount. It is driven by a preset Pb pulse and Pc pulse. In S121 and S124, both motors are temporarily stopped. As a result, the sheet is stably engaged with the paper feed roller. Thereafter, the cueing is performed using the paper feed motor as a main drive source. In S122 and S125, at the same time as the ASF motor starts executing the evacuation sequence, the paper feed motor executes the cueing sequence set in advance according to various printing conditions. At this time, A
The SF motor rotates reversely at a preset desired speed, and
The turn roller retracts while rotating forward in the paper feed direction at the same paper feed speed as the paper feed roller. Therefore, no load is generated by the U-turn roller at the time of sheet cueing in the printer section, and the cueing accuracy is improved. Finally A
The state of the SF sensor is checked, and if the ASF sensor is ON, it is normal and the automatic sheet feeding is completed (S126). Thereafter, a recording operation is performed. However, since the U-turn roller is retracted, no back tension occurs, and good recording image quality can be obtained.

Next, forced ejection will be described. When the ASF sensor is OFF in the last step S126 in FIG. 56, the paper feed shaft is not at the original standby position, and stops at a halfway rotational phase. For example, if the paper feed shaft 405 is located at a position as shown in FIG. 37, the separation roller rubber 112c presses the sheet 111a of the cassette, and back tension is generated in the printer unit after cueing. Such a state can occur in the case of the paper feed retry in FIG. In other words, in the state where the sheet slips in the first sheet feeding and reaches just before the paper sensor, reaches the paper sensor with a small feed amount by retry, and ends the cueing operation and the retreat operation of the U-turn roller. is there. At this time, the paper feed shaft is stopped during rotation. In this example, in order to secure the recording performance and to take care of unexpected attachment / detachment of the cassette, in such a state, the sheet is discharged and the sheet feeding system is completely returned to the initial state.

FIG. 57 shows the flow of forced paper ejection. Figure 56
If the ASF sensor is OFF in the final step S126, the sheet whose cueing has been completed is discharged by cooperation of the ASF motor and the paper feed motor as shown in FIG. First AS
The F motor is rotated forward (S201), and the paper feed motor is rotated forward (S207) to start feeding the sheet. A
If the ASF sensor is turned on for the SF motor (S202)
The normal rotation is stopped (S203), and the evacuation sequence is executed (S204). In this state, the lock pawl is locked on the output shaft of the clutch, that is, the position of the paper feed shaft is initialized. Since the U-turn roller has been retracted, the subsequent forced discharge is performed by the transport system of the printer unit. If the ASF sensor does not turn on even when the driving amount of the ASF motor reaches the preset upper limit Pf pulse, a sheet jam or the like is considered, and the sequence is terminated as a forced ejection error (S205, S206). On the other hand, the paper feed motor that has started rotating forward with the ASF motor
When the value reaches F (S208), a preset Pe pulse is rotated forward (S209), and the sheet is discharged from the paper discharge roller.
If the paper sensor is not turned off even if the drive amount of the paper feed motor reaches the preset upper limit Pg pulse, there is a possibility of sheet jam, and the sequence is terminated as a forced paper ejection error (S213, S214). Pe in S209
After the pulse feed, the paper discharge retry counter is reset (S
210), if the paper ejection sensor is OFF (S211),
The paper feed motor is stopped (S212), and the process ends. If the sheet ejection sensor is ON (S211), since sheets remain in the sheet ejection sensor unit, additional feeding is performed by a predetermined amount of Ph pulses while counting up the number of retries, and even if 10 additional feedings are executed. If the paper ejection sensor remains ON, the process ends with a forced paper ejection error (S215, S216, S2).
17).

The flow relating to the automatic sheet feeding has been described above.

Next, with reference to the block diagram shown in FIG. 59, a main body control circuit for controlling the entire apparatus including the above-described paper feed control will be described. A controller 701 executes various programs, includes a gate array circuit for performing high-speed data arithmetic processing, and has various timers and counters for performing various timing controls. ROM70
4 stores various reference information such as a control table and setting value information. The MPU 702 is a so-called central processing chip that performs various calculations and the like. A RAM 703 is mainly used as a work area for the controller and the MPU. Controller 701, MPU 702, R
Various operations and instructions are executed by cooperation of the AM 703 and the ROM 704 to control the devices. ASF sensor 4
The states of the paper sensor 50, the paper sensor 629, the home position sensor 613, and the paper discharge sensor 630 are used for determining conditions in various controls as necessary. The ASF motor 406 is driven via an ASF driver 705, the carrier motor 608 is driven via a carrier driver 706, and the paper feed motor 609 is driven via a paper feed driver 707. The recording head 602 receives the output of the gate array circuit of the controller 701 and performs a recording operation.

[Printer / Carrier Scanning Unit] FIG.
FIG. 2 is an exploded perspective view of an internal configuration of a printing apparatus printer according to an embodiment of the present invention, as viewed from a sheet discharging side.

This apparatus is similar to the recording head cartridge 601 shown in FIG.
And a carrier 604 for detachably holding the carrier. The carrier 604 includes a recording sheet (a recording medium including a recordable flexible sheet such as a plastic sheet) on a guide shaft 606 and a guide rail 607, both ends of which are fixed to the printer frame 605 and arranged in parallel with each other. And is slidably supported in a main scanning direction which is orthogonal to the conveying direction of the recording sheet and parallel to the surface of the recording sheet.

The guide shaft 606 is a solid shaft with a smooth surface, and has a groove at one end for fixing it to the printer frame 605.

The carrier 604 includes a drive pulley 610 that is driven to rotate by a carrier motor 608 fixed to the printer frame 605, and a guide shaft 606.
The belt 6 looped between an idler pulley 611 supported by a printer frame 605 via a spring (not shown) so as to be slidable and rotatable in a direction parallel to
12 and is connected to the carrier motor 608
, The belt 612 is driven, and the carrier 604 is moved by the guide shaft 606 and the guide rail 607.
Reciprocating in the above-mentioned direction.
In this embodiment, the belt 612 is provided with a belt stopper formed by a urethane-based flexible member, and the shaft-shaped part of the belt stopper is used as the carrier 60.
4 is rotatably and slidably fixed in a minute range.

An ink tank 603 is detachably mounted on the recording head cartridge 601, and when ink is exhausted by recording, the ink tank 603 is removed.
The next recording can be performed by exchanging.

A home position sensor 613 for detecting the position of the carrier 604 by detecting the passage of the carrier 604, a recording head cartridge 6
01 has a flexible cable 614 for transmitting an electric signal from the main board 302.

A flexible guide 615 made of a flexible member is provided near the outlet of the carrier 604 to restrict the posture of the flexible cable 614.

[Printer / Paper Feed Unit] Next, the configuration for transporting the recording sheet 111 will be described with reference to FIG.

A paper feed roller 620 is rotatably supported by the printer frame 605.
The LF gear 621 is fixed to the 0 shaft end. The paper feed roller 620 has an outer diameter of φ7.5 coated with urethane to increase the coefficient of friction with the recording sheet 111.
61 is the solid axis.

The paper feed roller 620 is driven to rotate by the paper feed motor 609 via the LF gear 621.

FIG. 62 is a side sectional view of a printer of a recording apparatus according to an embodiment of the present invention.

As shown in this figure, the lower side of the paper transport surface is mainly composed of a platen 622. The platen 622 is fixedly incorporated into the base 101, and forms a box structure having a gap between the base 101 and the waste ink absorber 623 described later. By screwing the platen 622 and the base 101 in this state,
It corrects the warpage of individual parts and improves the rigidity of the device.

On the surface of the platen 622, projecting ribs 622b for reducing a sliding load during conveyance are formed in a plurality of rows along the recording sheet 111 conveyance direction.

A pinch roller 625 held by a pinch roller holder 624 rotatably mounted on the platen 622 is moved by a spring (not shown) to the paper feed roller 6.
20 from below, the paper feed roller 6
The recording sheet (not shown) sandwiched between the sheet feeding roller 20 and the pinch roller 625 is conveyed by driving the paper feed motor 609.

The pinch roller 625 is connected to the paper feed roller 62.
0, the diameter of the outer peripheral portion that sandwiches the recording sheet 111 is
It is almost the same as the paper feed roller 620 and slightly smaller, and has an outer diameter φ6. Further, the outer diameter of the rotating shaft portion held by the pinch roller holder 624 and the pinch roller 62
The ratio of the diameter of the outer peripheral portion of No. 5 is 1: 7.5, and the shaft diameter is φ0.8. Thereby, since the rotation load is light, the recording sheet 111 can be transported with almost no loss. Further, since the outer diameter of the pinch roller 625 and the outer diameter of the paper feed roller 620 are almost the same, it is easy to guide a recording sheet (not shown) to a contact point (nip) between the pinch roller 625 and the paper feed roller 620 when feeding paper. In addition, it is possible to reduce the force for pushing the leading end of the recording sheet into the nip.

Further, the outer peripheral portion of the pinch roller 625
Both the shaft portions are subjected to nickel plating, and are discharged from the recording head cartridge 601 to be corroded by ink mist contained in the atmosphere inside the apparatus, or to be worn when sliding with the pinch roller holder 624 for a long time. The pinch roller 6 even after long-term use.
The rotation load of 25 is hardly increased.

On the opposite side of the paper feed roller 620 across the recording head cartridge 601, paper discharge rollers 626 for discharging the recording sheet after recording outside the machine are attached to the platen 622 in two rows. Discharge roller 62
The driving force is transmitted from the paper feed roller 620 via the idler gear train 627 to the paper feed roller 6.
It rotates in synchronization with 20. A spur 628 attached to the guide rail 607 is disposed above the paper discharge roller 626. When the paper discharge roller 626 is pressed against the spur 628 from below by a spring (not shown), the recording sheet is discharged. 626 and the spur 628 are conveyed.

A paper sensor 629 is provided on the side of the manual feed slot 102e opposite to the recording head cartridge 601 across the paper feed roller 620, and a paper discharge sensor 630 is provided between two rows of paper discharge rollers 626. Of the recording sheet 111 is detected.

The platen 622 has the recording sheet 111 at the left end.
Has a paper guide portion 622a, which serves as an approximate reference when inserting a sheet. Further, among the plurality of protruding ribs 622b formed on the surface of the platen 622, the paper guide portion 622a is formed.
The rib closest to the paper guide portion 622a prevents the recording sheet from being caught when approaching the paper guide portion 622a.
A gentle slope is formed on the slope opposite to a (see FIG. 61).

From the ASF unit to the printer unit 60
Since the recording sheet 111 conveyed to the recording sheet 111 is conveyed while being held in a posture by the U-turn roller 112d, the recording sheet 111 does not positively come into contact with the paper guide portion 622a. When manual paper is fed, the paper may be inserted obliquely and contact the paper guide 622a depending on the degree of insertion by the operator.

Further, the platen 622 has a concave portion 622c, and stores the leading end of the paper sensor 629 when the recording sheet 111 is not inserted. In addition, platen 6
The ribs 622b described above are provided on both sides of the concave portion 622c of No. 22, but the height of the ribs is about 0.5 mm higher than the other ribs 622b. With this configuration, the leading end of the paper sensor 629 can be securely stored, and the sheet can be prevented from being partially dented by the lever pressing force of the paper sensor 629 and erroneously detected. Further, the recording sheet 111 is
9, when the recording sheet 111 is conveyed in a direction opposite to the normal sheet discharging direction, the leading end of the paper sensor 629 bites into the recording sheet 111 and is forcibly returned to a state in which the absence of the recording sheet is detected. However, when the rib is raised, the angle between the lever of the paper sensor 629 and the recording sheet 111 becomes shallower, so that the above-described state of biting does not occur. It is possible to prevent erroneous detection, damage to the recording sheet 111, and the like (see FIG. 61).

When the recording operation on the recording sheet 111 is completed by a procedure described later, the recording sheet 111 is sandwiched between the discharge roller 626 and the spur 628, and the discharge roller 62
6, the discharge tray 1 is driven by a so-called discharge operation.
10 is discharged. At this time, if the recording sheet 111 is not completely discharged onto the paper discharge tray 110 and remains on the paper discharge rollers 626, the recording sheet 111 will not hit the previous recording sheet when the recording operation by the next recording sheet 111 starts. Contact with the paper discharge sensor 630 because a so-called jam may occur.
After confirming that the recording sheet has been completely discharged, the next recording sheet is fed.

[Printer / Recording Unit] The function of this device as a recording device is that the recording head cartridge 601 discharges ink downward in FIG. 62 in response to a recording signal in synchronization with the reciprocation of the carrier 604. By
One line is recorded on a recording sheet. That is, the recording head cartridge 601 generates a fine liquid discharge port (orifice), a liquid path, an energy action section provided in a part of the liquid path, and a droplet forming energy to act on the liquid in the action section. Energy generating means.

Examples of the energy generating means for generating such energy include a recording method using an electromechanical transducer such as a piezo element, and irradiation with electromagnetic waves such as a laser to generate heat.
A recording method using energy generating means for discharging droplets by the action of the heat generation, or a recording method using energy generating means for discharging liquid by heating the liquid with an electrothermal converter such as a heating element having a heating resistance. There are.

Among them, a recording head used in an ink jet recording method for discharging a liquid by thermal energy has a high density of liquid discharge ports for discharging a recording liquid to form discharge droplets. This makes it possible to record at a high resolution. Among them, a recording head using an electrothermal transducer as an energy generation source can easily be made compact, and has the advantages of IC technology and micro-machining technology, which have recently made remarkable progress in technology in the semiconductor field and markedly improved reliability. This is advantageous because it can be used for two reasons, high-density mounting is easy, and the manufacturing cost is low.

The recording head cartridge 601
When one line is recorded by moving the recording sheet 111, the recording sheet 111 is conveyed one line by the paper feed motor 609 in the direction of the arrow shown as the conveying direction on the recording sheet 111 in FIG. ing.

[Printer / Recovery Section] The present apparatus has a recovery mechanism described later, which removes ink and foreign matters accumulated in the nozzles of the recording head cartridge 601 by suction. In addition, an operation called a preliminary ejection operation is performed to remove a small amount of foreign matter and ink remaining in the nozzles even when the recovery operation is performed. In the preliminary ejection operation, the recording head driving for normal printing is performed at a predetermined position other than on the recording sheet. The waste ink discharged by these operations is stored in a waste ink absorber 623 incorporated in the inner wall of the platen 622.

FIG. 63 is a diagram showing a piston drive transmission path from the paper feed motor to the recovery system of the recording apparatus according to one embodiment of the present invention.

The rotation of the paper feed motor 609 changes from the LF motor gear 609 a and the LF double gear 631 to the LF gear 6.
21 and the paper feed roller 620 rotates. When the carrier 604 reaches the non-recording area and the trigger gear 632 (coaxially slidably and rotatably mounted on the paper feed roller) is pressed by the clutch switching protrusion 604c formed on the carrier 604, the trigger is released. Gear 632
Moves in the direction of the LF gear 621, and the driving of the LF gear 621 is performed by the engagement gear described later in detail.
2 is transmitted. Trigger gear 632 and pump gear 63
3 is engaged in this state, so that the drive is transmitted to the pump gear 633. Usually, the trigger gear 632
Is separated from the LF gear 621 and the pump gear 6
The drive from the LF gear 621 is not transmitted to the pump gear 633 because the notch 33 is provided at a position where the 33 engages with the LF gear 621.

At the same time when the LF gear 621 and the pump gear 633 engage with each other, the carrier 604 moves to the capping position, and
01 ink ejection port is closed. The pump gear 633 is
The piston in the cylinder 635 is moved via the cylinder gear 634, and accordingly, ink is sucked into the cylinder 636 from the ink ejection port of the recording head cartridge 601 via the cap 636, and the ink is ejected from the recording head cartridge 601. Function is restored.

Thus, the transmission of the driving force from the paper feed motor 609 to the pump gear 633 is performed by the pump gear 63
4, controlled by the movements of the LF gear 621, the trigger gear 632, and the carrier 604.

FIG. 64 is an enlarged view around the switching mechanism of the recording apparatus according to one embodiment of the present invention.

In FIG. 64, the trigger gear 632 is provided concentrically and slidably on the paper feed roller. The trigger gear 632 and the pump gear 633 are in an engaged state. In this state, the trigger gear 632 and the L
The trigger gear 632 is separated from the F gear 621.
From the LF gear 621 is not transmitted. In addition, the pump gear 633 does not receive the driving force of the LF gear 621 because the portion that meshes with the LF gear 621 is missing (missing teeth). When the carrier 604 moves further in the direction of the LF gear 621, the trigger gear 632 further moves to the LF gear 621.
Side, and the trigger gear 632 and the LF gear 621 come into contact with each other.

[0209] Triangular teeth that mesh with each other are provided on the contact surfaces (opposite surfaces). FIG.
5 is a diagram showing an engagement shape between the LF gear 621 and the trigger gear 632; FIG. 5A is a diagram showing a shape of a contact surface of the LF gear 621 with the trigger gear 632;
(B) is a cross-sectional view of the contact surface 621a of the LF gear 621 in (a), (c) is a diagram showing the shape of the contact surface with the LF gear 621 provided on the trigger gear 632, and (d) is (c). 5 is a cross-sectional view of a contact surface 632a of the trigger gear 632 of FIG.

As shown in FIGS. 65 (a) and (b), L
The contact surface 621a of the F gear 621 has triangular teeth (hereinafter, triangular teeth). The pitch is gear 62
1b, and the valley of the triangular teeth is set to be the same as the peak of the gear 621b. Also, as shown in FIGS. 65 (c) and (d), the contact surface 6
The shape of 32a is the same triangular tooth as the shape of the contact surface 621a of the LF gear 621. And the pitch is gear 632
b, and the peak of the triangular teeth is set to be the same as the peak of the gear 632b.

With the above configuration, when the LF gear 621 and the trigger gear 632 come into contact with each other, the contact surface 6 of the LF gear 621
Contact surface 6 between triangular tooth valley 21a and trigger gear 632
The ridges of the triangular teeth 32a mesh with each other, and the LF gear 621 and the gears 621b and 632b of the trigger gear 632 have the same phase. Accordingly, the trigger gear 632 rotates with the rotation of the LF gear 621. Trigger gear 632 is L
Even when the gear 621 moves to the F gear 621 side, the engagement between the pump gear 633 and the trigger gear 632 is not released, so that the rotation of the trigger gear 632 causes the pump gear 633 to rotate.

However, in such indirect driving of the pump gear 633 via the trigger gear 632 by the LF gear 621, the driving force is limited.

Therefore, as shown in FIG. 64, a wide cutout portion 633a extending in the radial direction is formed at the peripheral portion of the pump gear 633. That is, the pump gear 633 has a portion formed to be thicker than the trigger gear 632 and the LF gear 621, and further, the periphery of the pump gear 633 has a portion of the carved tooth from the vicinity of the center in the axial direction to one end (in FIG. 64). , Notch 633 cut out to arrow E)
a.

FIGS. 66A and 66B are diagrams showing the arrangement of the pump gear 633 and the trigger gear 632. FIG. 66A is a diagram viewed from the right side, and FIG. 66B is a diagram viewed from the left side.

As shown in FIG. 66 (a), the width of the notch (arrow F in the figure) depends on the pump gear 633 and the LF gear 62.
Even when the notches 1 and 2 are located at positions where they engage with each other, the width is at least such that the notch does not contact the teeth of the LF gear 621.

However, when the trigger gear 632 rotates slightly, the pump gear 633 rotates and the notch moves, so that the pump gear 633 and the LF gear 621 directly mesh with each other, whereby a large driving force is obtained.

In this state, the carrier 604 is connected to the LF gear 62.
Even when the pump gear 633 and the LF gear 621 are disengaged from each other by moving the trigger gear 632 and the LF gear 621 by a mechanism described in detail later, the driving force is continuously transmitted.

Further, the trigger gear 632 is connected to the pump gear 6.
33 while being engaged with the LF gear 621.
Is disengaged, so that a problem such as a collision of the tooth surface due to the movement of the trigger gear 632 does not occur.

The pump gear 633 and the trigger gear 6
32 meshes with the pump gear 633 and the LF gear 6
Since the gear 21 is not required at the time of the meshing state, the meshing region of the pump gear 633 with the trigger gear 632 is at least the meshing portion (hatched portion, It is only necessary to provide the arrow G).

As a result, the tooth width can be reduced in portions other than the portion where the pump gear 633 meshes with the trigger gear 632, so that different mechanical parts and the like can be arranged in that region.

Next, the pump gear 633 and the LF gear 621
Trigger gear 632 and LF gear 62 after
1 will be described.

As described above, the trigger gear 632 and the L
When the F gear 621 is engaged, the triangular teeth formed on the contact surfaces of both gears are in the engaged state. Even if the carrier 604 is separated from the trigger gear 632 and further rotated from this state, the driving force is directly transmitted by the pump gear 633 and the LF gear 621, and the driving force is not transmitted to the trigger gear 632, so that the trigger gear 632 is not transmitted. Is trying to maintain the meshing state with the LF gear 621 (actually, the meshing may be released by vibration or the like).

From this state, the LF gear 621 is used to cancel the drive transmission from the LF gear 621 to the pump gear 633.
Is rotated in the reverse direction. Then, the cut-out portion 633a of the pump gear appears again, and at the same time, the gear portion (FIG. 66 (b), G portion) of the pump gear 633 that meshes with the trigger gear 632 is again meshed with the trigger gear 632. When the LF gear 621 is further rotated, the direct transmission of drive between the pump gear 633 and the LF gear 621 is stopped, and the rotation of the pump gear stops. However, the trigger gear 632 is further rotated because it is meshed with the LF gear 621, so that the drive transmission to the pump gear 633 is performed through the trigger gear 632.
At this time, as shown in FIG.
No. 3 does not rotate in the missing tooth position because the arm 635a of the cylinder 635 collides with the concave wall surface 633c of the pump gear 633 to prevent rotation. For this reason,
A force in the thrust direction acts on the trigger gear 632 along the tooth surface of the gear of the pump gear 633, and the trigger gear 632 is separated from the LF gear 621.

Next, referring to FIGS. 67 to 72, a detailed description will be given of the recovery means including a cap and a cylinder.

FIGS. 67 to 72 are explanatory views of the operation of the recovery system in the recording apparatus according to one embodiment of the present invention.

A cap 636 made of chlorinated butyl rubber or another suitable elastic material is integrally held by a cap holder 637. The cap holder 637 includes an arm 635a integrally extending from the cylinder 635.
Is held rotatably.

The cylinder 635 has a piston 641 made of an elastic material such as rubber inside.
By driving 0, a negative pressure can be generated in the cylinder 635. The movement of the piston shaft 640 and the piston 641 will be described later in detail.

The cap 636 is provided with a joint portion 636a formed integrally with the cap 636. The joint portion 636a is press-fitted into a joint portion 635b provided on the cylinder 635 with an interference, so that the cylinder 635 and cap 636 are joined in a sealed state. In addition, an ink suction port 635c is provided inside the joint portion 635b provided in the cylinder 635, and the cap 636 communicates with the inside of the cylinder.

Next, a method of pressing the cap 636 against the recording head cartridge 601 and releasing the cap 636 will be described with reference to FIG.
7 and FIG. 68 and FIG. 69.

As described above, the cap 636 integrally held by the cap holder 637 is hermetically connected to the cylinder 635.
Is rotatably held by a cylinder arm 635a with respect to the cylinder 635.

Here, the cap 636 and the cylinder 635
Are connected by the joints 636a and 635b, but the joint 636a is made of an elastic body such as chlorinated butyl rubber and is integrally formed with the cap 636, and is also made of an L-shape so as to be deformable. There is no hindrance to the rotation (see FIG. 68).

As shown in FIG. 68, the cap holder 63
7 has a platen 6 with a compression cap spring 638 having a different diameter.
22 and the cap holder 637, and constantly biases the cap holder 637 toward the recording head cartridge. Here, the cylinder 635 is a platen 6
The support member 22 is rotatably supported on a cylinder shaft.

Therefore, a rotational force is applied to the cylinder 635 and the cap 636 by the compression cap spring 638 of different diameter about the cylinder axis. Further, as shown in FIG.
35d are integrally formed, and the cylinder control unit 63
The tip of 5d is in contact with the cap control cam portion 633b, which is the first cam member of the pump gear 633.

Therefore, the rotation of the cylinder 635 is controlled by the cap control cam portion 633b of the pump gear 633 via the cylinder control portion 635d.

That is, when the cylinder control section 635d moves up and down along the cap control cam section 633b of the pump gear 633, the cap 63 moves through the cylinder 635.
6, capping and uncapping of the recording head cartridge 601 can be performed.

FIG. 68 shows the cap 636 pressed against the recording head cartridge 601, and FIG. 69 shows the released state. In FIG. 68, reference numeral 639 denotes a cap control spring. The entire length of the cap control spring 639 is limited by the spring restricting portion 622d of the platen 622 and is separated from the lower surface of the cap holder 637. Therefore, the cap 636
Has no effect on the pressure-contact state.

FIG. 69 shows a state in which the cylinder 635 is rotated by the rotation of the pump gear 633, and the cap 636 is separated. In this state, the cap control spring 63
Reference numeral 9 abuts on the lower surface of the cap holder 637 to apply clockwise turning power to the cap holder 637. Accordingly, the cap holder 637 rotates clockwise, but stops when the stopper 637a provided on the cap holder 637 in a protruding state contacts the cylinder arm 635a.

At this time, the stopper 637a is set so that the cap 636 and the recording head cartridge 601 are parallel.
If you set the position of
36 and the recording head cartridge 601 can always be kept parallel.

As described above, since the posture when the cap is released is stabilized, even if the amount of movement for opening the cap 636 is reduced, the cap 636 and the cap holder 6
Since the cap 636 and the recording head cartridge 601 do not come into contact with each other due to the inclination of the 37, the size of the apparatus can be reduced.

Incidentally, the pump gear 633 can be selectively connected to the LF gear 621, and the driving force of the paper feed motor (not shown) is supplied to the LF gear 621 via a gear train (not shown).
After that, when the clutch operation is performed by the movement of the carrier 604, the driving force transmitted to the LF gear 621 is transmitted to the pump gear 633. Here, if the carrier 604 does not perform the clutch operation, the pump gear 6
33 is provided with a notch, so that the LF gear 6
21 is cut off, and the driving force is not transmitted to the pump gear 633.

Here, the piston shaft 640 and the piston 64
1 will be described.

In FIG. 67, the pump gear 633 is connected to the cylinder gear 634. That is, the LF gear 621 is operated by the above-described carrier 604 performing a clutch operation.
Is transmitted to the pump gear 633 and further transmitted to the cylinder gear 634. Further, a boss 634 a provided on the inner wall of the cylinder gear 634 is fitted into a lead groove 640 a provided on the piston shaft 640, and a cylinder 635 is fitted into a groove 640 b provided on the tip of the piston shaft 640.
The guide 635e provided on the piston shaft 6
The rotation of the pump gear 633 can be converted into a linear movement of the piston shaft 640 by stopping the rotation of the piston 40.

The piston shaft 640 is provided with two flange portions 640c and 640d formed integrally with the shaft.

Silicon rubber, N
A so-called donut-shaped piston 641 made of an elastic member such as BR rubber and having a through hole in the center is set. Naturally, the cylinder 635 and the piston 641 have a cylindrical shape, and the outer diameter of the piston 641 is larger than the inner diameter of the cylinder 635, and a certain interference (approximately,
(About 0.2 mm to 0.5 mm).

Therefore, even when the piston 641 moves, the inner wall of the cylinder and the outer wall of the piston can maintain the sealing property.

The cylinder seal 642 also has a donut shape. The outer diameter of the cylinder seal 642 has sealing properties with the inner diameter of the cylinder, and the inner diameter of the cylinder seal 642 maintains sealing properties with the piston shaft 640. The cylinder washer is locked by a step provided on the cylinder 635. A rib 641 is provided on the side of the piston 641.
a is provided to face the flange portion 640c over the entire circumference, and the inner diameter of the piston 641 is larger than the outer diameter of the piston shaft 640, so that play is provided.

The width of the piston 641 is smaller than the distance between the two flanges provided on the piston shaft 640. These play are for discharging the sucked ink and will be described later.

In the initial state of the pump, the piston shaft is pulled up as shown in FIG.
Is also pushed by the flange portion 640d and is at the position shown in FIG.

Next, when a suction signal is output from the control unit,
The carrier 604 performs a latch operation, and the LF gear 621
The drive is transmitted to the pump gear 633 and the cylinder gear 634 from the transmission, and the rotation to the cylinder gear 634 becomes a linear motion of the piston shaft 640.

When the piston shaft 640 moves leftward in the figure, the flange portion 640c is pressed against the piston side rib 641a as shown in FIG. 70, and the space 635f on the right side of the piston 641 is closed.

Further, as the piston shaft 640 moves to the left, the volume of the space 635f increases while the space 635f remains closed, so that the space 635f gradually becomes lower than the atmospheric pressure (negative pressure state).
This negative pressure gradually increases as the piston shaft 640 (piston 641) moves, and becomes maximum when the end of the side surface of the piston 641 passes through the ink suction port 635c (see FIG. 71).

The reason is that the space 635f and the ink suction port 6
This is because the communication of 35c allows ink or air to flow into the space 635f from the outside via the ink suction port 635c and the cap 636, so that the negative pressure in the space 635f is eliminated. Here, when the piston 641 passes through the ink suction port 635c, the pump gear 633 is closed so that the cap 636 hermetically seals the recording head cartridge.
By forming the cap control cam portion 633b provided in the above, ink suction becomes possible.

Next, the discharge of ink from the cylinder will be described with reference to FIG. As described above, the ink sucked from the recording head cartridge 601 is applied to the space 6 in the cylinder.
When the piston shaft 640 is pulled up by rotating the motor in the reverse direction (in the direction of arrow B), the width of the piston 641 is smaller than that between the flanges of the piston shaft 640. Since it is larger than the outer diameter of the shaft 640, the piston shaft 640 (piston 64
With the lifting of 1), the piston 641 and the piston shaft 64
Through the zero play, the ink in the space 635f moves to the space 635h on the left side of the piston 641 (flow of arrow C in FIG. 72). Therefore, the piston shaft 640
While the reciprocating operation of the (piston 641) is repeated, the cylinder 635 is gradually discharged from the end 635g.

A cylinder absorber 643 is inserted into the cylinder end 635g. The cylinder absorber 643 is formed of a foamed sponge, and a material having good ink transmission properties is selected. That is, it is required to efficiently discharge the ink in the cylinder 635 to the outside. In this embodiment, a melamine resin-based foam material is used.

The cylinder absorber 643 is in contact with the waste ink absorber 623 contained in the platen 622. As the waste ink absorber 326, a material having a high ink holding ability such as a laminated sheet of paper or a polymer absorber is selected.

With this configuration, the waste ink sucked from the recording head cartridge 601 reaches the waste ink absorber 623 via the cylinder 635 and the cylinder absorber 643, and is held there.

[Printer / Head Mounting Unit] Next, a head that can be mounted on this apparatus will be described.

In the above description, the recording head cartridge 6 is detachably mounted on the carrier 604 of the recording apparatus.
Although the description has been made in the example in which 01 is mounted, this point will be described in more detail with reference to FIGS. 73, 74, 75, and 76.

The recording head cartridge 601 has two types, namely, a monochrome recording head section 650 shown in FIG. 74 and a color recording head section 651 shown in FIG. 75. Further, the recording sheet cartridge 601 shown in FIG. Instead, any one of a total of three types of head units, capable of reading an inserted document, such as a scanner head 652, can be mounted on the carrier 604 of the present apparatus. Hereinafter, when the three types of the monochrome recording head unit 650, the color recording head unit 651, and the scanner head 652 are collectively referred to as a head unit.

First, a description will be given of FIG. 73 for mounting the above three types of heads in a detachable manner.

FIG. 73 is a perspective view of the carrier 604 when no head is mounted.

At one end of the carrier 604, a cable terminal portion 614a of the flexible cable 614 is provided. The cable terminal portion 614 a is provided on the carrier 604 with the monochrome recording head portion 650 and the color recording head portion 65.
1. When one of the scanner heads 652 is attached,
The head terminal portion 653 of each head portion (see FIGS. 74 and 7)
5, see FIG. 76), which makes electrical connection to the head.

The cable terminal 614a of the carrier 604
Is located on the surface where two head part positioning projections 60 are located.
4a and 604b are provided integrally. Carrier 6
In a state where the head portion is mounted on the head portion 04, the head portion positioning protrusion 604a is positioned by the positioning notch 654 on the head portion side.
In addition, the head portion positioning protrusions 604b are fitted into the positioning holes 655 on the head portion side, and accurate positioning of the head portion with respect to the carrier 604 is performed.

Further, a contact spring 656 is provided on the carrier 604 at a position facing the cable terminal portion 614, and a head guide 657 formed of resin is fixed to the tip of the contact spring 656. That is, the head guide 657
Are elastically supported by the carrier 604.

When the head portion is mounted on the carrier 604, the head guide 657 urges the head portion toward the cable terminal portion 614a so that the cable terminal portion 614a is pressed.
14a and the head terminal portion are electrically connected.

Further, the head guide 657 has a function to be able to be attached and detached by bending when replacing the head part, and to hold the mounted head part so as not to come off upward.

With such a configuration, when the user replaces the head unit, the user inserts the head terminal side of the head unit so as to face the cable terminal unit 614a of the carrier 604, and then replaces the head unit. By pressing the upper surface of the head downward, the head guide 657 bends and the mounting of the head portion is completed with a click feeling, and at that time, the electrical connection is completed.

When removing the head unit, the head unit attachment / detachment operation units 658a, 659a, 659
When the finger 52a is pulled up with a finger, the head guide 657 bends, and the head portion can be removed from the carrier 604.

[Printer Head Unit] Next, each of the above head units will be described with reference to FIGS. 74, 75 and 76.

FIG. 74 is a perspective view of a monochrome recording head section 650 for performing only monochrome printing (usually black). In FIG. 74, reference numeral 658 denotes a monochrome recording head cartridge.
An ejection port surface 658b having a nozzle for ejecting ink for recording is formed in a portion before 58. 65
Reference numeral 3 denotes a head terminal for receiving an electric signal for performing ejection. By supplying an electric signal from the printer unit 600 to the monochrome recording head cartridge 658 via the head terminal unit 653, ink can be ejected downward from the nozzles provided on the ejection port surface 658b in FIG. 74 to perform recording. Reference numeral 654 denotes a positioning notch, and reference numeral 655 denotes a positioning hole. The positioning notch 654 and the positioning hole 655 are fitted with the head positioning protrusions 604a and 604b provided on the carrier 604, so that positioning with respect to the carrier 604 is ensured. It is to be.

Reference numeral 603c denotes a monochrome ink tank.
The inside contains ink. The monochrome ink tank 603c is detachably fixed to the monochrome recording head cartridge 658 by a latch section 603d formed integrally and elastically with the monochrome ink tank 603c. The monochrome ink tank 603c and the monochrome recording head cartridge 658 have an ink flow path formed by a detachable joint (not shown).

Therefore, ink is consumed by recording, and
When the ink in the monochrome ink tank 603c is exhausted, the latch unit 603d is bent to move the monochrome ink tank 603c to the monochrome recording head cartridge 658.
The recording can be continued by detaching and installing a new monochrome ink tank 603c.

FIG. 75 is a view for explaining color printing.
FIG. 6 is a perspective view of a color recording head unit 651. In FIG. 75, reference numeral 659 denotes a color recording head cartridge,
An ejection port surface 6 having a nozzle portion for ejecting ink for recording is provided in a portion in front of the recording head cartridge 659.
59b are formed. Hereinafter, only differences from the monochrome recording head unit 650 will be described. Discharge port surface 65
9b is provided with four independent nozzle groups for discharging four colors of yellow, magenta, cyan, and black, respectively, in order to perform color printing. Reference numeral 603b denotes a black ink tank. The black ink tank 603b contains black ink therein, and the discharge port surface 659 is connected via a detachable joint (not shown).
b. It is connected to the black nozzle group provided in b.

Reference numeral 603a indicates a color ink tank, and the inside of the color ink tank 603a is an independent three-color ink tank.
Divided into two volumes, each containing a yellow ink, a magenta ink, and a cyan ink. The color ink tank 603a is also the black ink tank 60
Similarly to 3b, the yellow ink is connected to the yellow nozzle group, the magenta ink is connected to the magenta nozzle group, and the cyan ink is connected to the cyan nozzle group via three independent detachable joints (not shown). I have.

The 603 on the black ink tank 603b side
“d” indicates a latch unit for replacing the black ink tank 603b, and 603d on the side of the color ink tank 603a indicates a latch unit for replacing the color ink tank 603a.

As described above, by installing the color recording head unit 651 in the printer unit 600, color recording becomes possible, and when the black ink runs out, only the black ink tank 603b is replaced, and yellow and magenta are replaced. When one or all of cyan and cyan are exhausted, the color ink tank 603a
It is only possible to exchange.

FIG. 76 is a perspective view of the scanner head 652. A detailed description will be given later.

In FIGS. 74 and 75, X represents the distance from the positioning notch 654 to the discharge port surfaces 658b and 659b, and is the same value in the monochrome recording head cartridge 658 and the color recording head cartridge 659. Is about 13 mm. On the other hand, in the scanner head 652 in FIG.
Represents the distance between the positioning notch 654 and the reading section surface 652b, and is set shorter than X, and is about 9 mm in the present invention.

From the Y value, the difference between the position of the discharge port surface and the horizontal line of the reading unit surface in the vertical direction is 4 mm, which is the difference between the above 13 mm and 9 mm.

For this reason, when the scanner head 652 is mounted, even when the capping operation and the wiping operation are performed, the cap 636 and the blade 644 do not touch the reading surface 652b of the scanner head 652.

As a result of such a configuration, when the scanner head 652 is mounted, the cap 63 dirty with ink is
6 and the blade 644 can prevent the reading surface 652b from being soiled.

[Printer / Scanner Unit] Next, the scanner unit, which is one of the features of the recording apparatus of the present invention, will be described.

FIG. 77 shows a schematic sectional view and a perspective view of the scanner head 652.

In FIG. 77, reference numeral 670 denotes an LED for illuminating the document surface 675, and L emitted from the LED 670.
The ED light 672 passes through the LED opening 673 and the original surface 67.
5, the image light 676 on the document surface 675 passes through a field lens 677 provided in the sensor opening 674, the optical path is bent at a right angle by a mirror 678, passes through an imaging lens 679, and forms on the sensor 671. Image.

The center of the sensor opening 674 is larger than the distance between the ink ejection port 660 of the monochrome recording head cartridge 658 and the color recording head cartridge 659 from the surface where each recording head cartridge is in contact with the carrier 604. In this embodiment, it is shifted by about 4 mm.

[0286] The LED 670 and the sensor 671 are electrically connected to each other and are drawn out to the outside by the wiring board 680. Electrodes are formed on the head terminal portion 653 of the wiring board 680, and the electrodes are brought into contact with the electrodes of the carrier 604 (not shown) by pressure contact, so that signals can be guided to the main body side control circuit.

The appearance of the scanner head 652 is the same as that of the recording head cartridge 601 with the ink tank 603 mounted thereon, and similarly to the recording head cartridge 601, the claw portion 681 which is a part of the exterior is transferred to the carrier 604.
It can be mounted by the latch of. In addition, when removing, the head unit attaching / detaching operation unit 652a is lifted and the claw unit 6 is lifted.
The latch 81 is released and can be easily removed.

When mounted on the carrier 604, the control unit automatically identifies the scanner and enters the scanner mode.

When a scanner reading signal is input from a host computer or the like, the control unit conveys the read original to a predetermined position by driving the paper feed motor 609, turns on the LED 670, and then turns on the carrier motor. While driving the 608, the image signal is read via the scanner driver unit.

Here, the driving speed of the carrier motor 608 can be changed depending on the original reading mode of the scanner head 652. The mode is a combination of the reading resolution and the gradation of each read value. The main scanning direction, which is the paper transport direction, has a resolution of 360 dpi, and the scanning direction of the scanner head 652 is the sub scanning direction, which is the scanning direction of the carrier 604. Since the resolution of the sensor 671 is 360 dpi and an output of 64 gradations is obtained, for example, 360 dpi in the main scanning direction and 360 dpi in the sub-scanning direction
From the reading at 64 gradations, 90 dpi in the main scanning direction,
Reading in two gradations at 90 dpi in the sub-scanning direction, reading at a resolution of 200 dpi in the main scanning direction, FAX
There is also a mode that considers consistency with Main scanning direction 360
In a mode having a large amount of data, such as reading in 64 dpi in the sub-scanning direction of 360 dpi, it takes time to process and transfer data. In the gradation reading, the carrier driving speed can be increased.

When the reading of one line is completed, the sheet is conveyed by one line by the paper feed motor 609 to read the next line.
Such an operation is performed until the end of the document.

As described above, the recording apparatus according to the present embodiment employs the recording sheet 1 by the recording head cartridge 601.
11, and the reading of a document by the scanner head 652 can be performed. In the following description, in the case of the recording sheet 111, the document includes the document except for the case of recording only.

[Recovery Operation During Printer / Printing] Next, the recovery operation during printing of the recording head cartridge 601 of the recording apparatus of the present invention will be described with reference to the flowchart in FIG.

The ejection of ink from the recording head cartridge 601 is controlled by the MPU 702 and the controller 701. When recording is started according to the recording command, the recording head cartridge 601 is moved to the monochrome recording head cartridge 65.
It is determined whether the cartridge is 8 or a color recording head cartridge 659 (S601).

If it is determined that the recording head cartridge 601 is the monochrome recording head cartridge 658, it is determined by the wiping timer whether or not the elapsed time from the previous wiping has exceeded a preset time T1 (S602). ). This preset time T
For example, it is set to 120 seconds as 1. And
Elapsed time from this wiping is a preset time T
If it exceeds 1, the ink adhering to the discharge port surface 658b of the monochrome recording head cartridge 658 is fixed and becomes difficult to remove, so that a wiping operation is performed and the discharge port surface 658b of the monochrome recording head cartridge 658 is performed.
The ink adhering to is wiped off by the blade 644 (S603).

When this wiping operation is completed, the wiping timer is set to 0 seconds (S604). Then, thereafter, a dot counter during wiping described later is set to 0 (S605). By the wiping operation, the ink adhering to the ejection port surface 658b of the monochrome recording head cartridge 658 is removed by the blade 644. When the blade 644 passes through each ejection port, the removed ink is applied to each ejection port. There is a risk of being pushed. If printing is performed in this state, the print quality will be degraded. Therefore, after the wiping operation, preliminary ejection B1 is performed to remove the pushed ink (S606). This preliminary ejection B1
The number of times of ink ejection from each ejection port is the same for each ejection port, for example, 250 times, and the ejection frequency is 2 kHz. After the end of the preliminary ejection B1, a preliminary ejection timer to be described later is set to 0 second (S607), and the process ends.

On the other hand, when the elapsed time from the previous wiping does not exceed the preset time T1, the number of inks ejected from each ejection port from the previous wiping is counted by the dot counter during wiping. It is determined whether this value exceeds a preset number C1 (S608). The preset number C1 is set to, for example, 24,883,200. Then, the number of inks ejected from each ejection port is a predetermined number C1.
In the case where the distance exceeds the predetermined value, the ink mist generated during printing adheres to the ejection port surface 658b, and the periphery of the ejection port may become wet with ink and deteriorate the ink landing accuracy. Execute and end.

On the other hand, if the number of inks ejected from each ejection port does not exceed the predetermined number C1, the elapsed time from the previous preliminary ejection (the elapsed time measured by the wiping timer) is determined by the preliminary ejection timer. Is different from the preset time P1 (S6).
12). The preset time P1 is set to, for example, 12 seconds. When the elapsed time from the previous preliminary ejection exceeds the preset time P1, the preliminary ejection A1 is performed (S613). The number of ink ejections from each ejection port in the preliminary ejection A1 is, for example, the same for each ejection port, and is 9 times, and the ejection frequency is 2 kHz. After the completion of the preliminary discharge A1, the preliminary discharge timer is set to 0 second (S607), and the process ends. On the other hand, if the lapse of time from the previous preliminary ejection has not exceeded the preset time P1, the process ends.

On the other hand, if it is determined that the recording head cartridge 601 is the color recording head cartridge 659, it is determined by the wiping timer whether or not the elapsed time from the previous wiping has exceeded a preset time T2 ( S622). This preset time T
For example, 2 is set to 60 seconds. If the elapsed time from the previous wiping exceeds the preset time T2, the ink adhered to the discharge port surface 659b of the color recording head cartridge 659 sticks and becomes difficult to remove. The operation is performed, and the ejection port surface 659b of the color recording head cartridge 659 is operated.
The ink adhering to is wiped off by the blade 644 (S623).

When this wiping operation is completed, the wiping timer is set to 0 seconds (S624). Thereafter, a Bk dot counter during wiping and a color dot counter during wiping, which will be described later, are set to 0 (S
625). By the wiping operation, the ink adhering to the ejection port surface 659b of the color recording head cartridge 659 is removed by the blade 644.
When 44 passes through each ejection port, the removed ink may be pushed into each ejection port. If printing is performed in this state, mixed ink is ejected from each ejection port, and the print quality deteriorates. Therefore, after the wiping operation, preliminary ejection B2 is performed to remove the mixed ink (S62).
6). The number of ink ejections from each ejection port in the preliminary ejection B2 is, for example, 90% for all black ink ejection ports.
And the ejection frequency is 2 kHz. Further, the ejection ports of the yellow ink, the magenta ink, and the cyan ink are the same for each color ejection port, and are set to 200 times, and the ejection frequency is set to 2 kHz. After the completion of the preliminary ejection B2, a preliminary ejection timer to be described later is set to 0 second (S627), and the process ends.

On the other hand, if the elapsed time from the previous wiping does not exceed the preset time T2, the number of black ink ejected from each ejection opening of the black ink from the previous wiping is determined by the Bk dot counter during wiping. And this value is set to a preset number C
It is determined whether the number exceeds 2 (S628). The preset number C2 is set to, for example, 6,220,800. When the number of black inks discharged from the respective black ink discharge ports exceeds a preset number C2, ink mist generated during printing adheres to the discharge port surface 659b, and the periphery of the discharge ports is reduced. Since there is a possibility that the ink may become wet and deteriorate the landing accuracy of the ink,
The processing is performed from 623 to S627, and the processing ends.

On the other hand, if the number of black inks discharged from the respective black ink discharge ports does not exceed the preset number C2, the color ink (yellow ink, yellow ink, The number of color inks ejected from the respective ejection ports is counted, and it is determined whether or not this value exceeds a preset number C3 (S6).
29). The preset number C3 is set to, for example, 2,488,320. If the number of color inks ejected from each color ink ejection port exceeds a preset number C3, ink mist generated during printing adheres to the ejection port surface 659b, and the periphery of the ejection port becomes Since there is a possibility that the ink may become wet and the landing accuracy of the ink may be deteriorated, the above-described steps S623 to S627 are performed and the process is terminated.

On the other hand, if the number of color inks ejected from the respective color ink ejection ports does not exceed the preset number C3, it is determined whether the recording mode is fine recording (S630). If the printing mode is fine printing, the preliminary ejection A2d is performed to further improve the printing quality (S631). The number of ink ejections from each ejection port in the preliminary ejection A2d is, for example, the same for all black ink ejection ports, and is set to three times, and the ejection frequency is 2 kHz. Further, the discharge ports of the yellow ink, the magenta ink, and the cyan ink are the same for all the discharge ports, and the discharge frequency is 2 kHz.
And The reason why the number of times of preliminary ejection of the black ink and the color ink are different is that unevenness of the color ink is easily noticeable with respect to the recording quality, unevenness of the black ink is hardly noticeable, and ink consumption is suppressed as much as possible. It is. Then, after the end of the preliminary discharge A2d, a preliminary discharge timer to be described later is set to 0 second (S627), and the processing ends.

On the other hand, when the recording mode is not the fine recording, the elapsed time from the previous preliminary ejection (different from the elapsed time measured by the wiping timer) exceeds the preset time P2 by the preliminary ejection timer. Is determined (S632). The preset time P2 is set to, for example, 10 seconds. Then, the elapsed time from the previous preliminary ejection is set to a preset time P2.
Is exceeded, the preliminary ejection A2 is performed (S63).
3). The number of times of ink ejection from each ejection port in the preliminary ejection A2 is, for example, the same for all ejection ports, that is, 9 times, and the ejection frequency is 2 kHz. After the completion of the preliminary ejection A2, the preliminary ejection timer is set to 0 second (S627), and the process ends.

The above flow is repeated for each line until a print end command comes.

As described above, in the present embodiment, the separation claw B208 on the non-reference side is offset from the reference side. Even when the non-reference side surface of the sheet is shifted to the reference side, the separation claw A207 on the reference side
And the separation claw B208 on the non-reference side reduces the difference in the amount of hooking on the sheet 111, thereby suitably performing the sheet separation operation.
Double feed, skewing, corner folding, and paper jam can be effectively prevented.

Further, since the offset amount of the separation claw B208 on the non-reference side to the reference side is smaller than the stroke amount of the front end pressing spring 206, even if the variation in the width direction of the sheet is small, the separation on the non-reference side can be performed. This prevents the amount of hooking of the claws B208 onto the sheet 111 from becoming excessively large.

Further, the stroke amount of the front end pressing spring 206 is larger than the moving pitch amount of the side guide 205 in the sheet width direction or the interval of the latch 205a.
When the operator stacks sheets on the apparatus, even if the side guide 205 is set to be outside the non-reference side of the sheet 111 by one click of the movement pitch of the side guide 205 due to an operation error, the tip pressing spring 206 is The non-reference side of the seat 111 can be biased,
One reference side is pressed against the reference guide member 201a, and the position of the stacked sheets can always be determined to be a uniform position.

[Other Embodiments] In the above-described embodiment, the roller-type paper feed roller 112e is exemplified as the feeding means for feeding the stacked sheets one by one from the uppermost position. However, the present invention is not limited to this, and may be configured by, for example, a rotating belt.

In the above-described embodiment, the sheet feeding apparatus to which the present invention is applied includes a recording head cartridge 601 as recording means and a scanner head 65 as reading means.
2 is used in an exchangeable image processing apparatus, but the present invention is not limited to this. For example, a recording device such as a printer that records an image on a recording sheet, or a scanner that reads an image of a document It can also be suitably used for a reading device or the like.

[0311]

As described above, according to the present invention,
Even if there are variations in the width direction of the sheet, the difference in the amount of hooking on the sheet between the reference side separation claw and the non-reference side separation claw is reduced, so that the sheet separation operation can be suitably performed and the multi-feed operation can be performed. Skew, corner breakage, and paper jam can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a sheet conveying apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the sheet conveying apparatus according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a base component (excluding an ASF unit and a printer unit).

FIG. 4 is a plan view showing a mounted state of the cassette.

FIG. 5 is a rear view showing a stored state of the quick seat.

FIG. 6 is a rear view showing a use state of the quick seat.

FIG. 7 is an exploded perspective view showing the remaining sheet amount detection and the configuration of its display unit.

FIG. 8 is a sectional view showing a sheet remaining amount detecting unit when a cassette is not mounted.

FIG. 9 is a cross-sectional view showing a sheet remaining amount detection unit when a cassette is mounted.

FIG. 10 is a perspective view showing a cassette installation, detection of a remaining amount of sheets when sheets are fully loaded, and a display unit thereof.

FIG. 11 is a perspective view showing a cassette installation, detection of the remaining amount of sheets when the number of sheets is reduced, and a display unit thereof.

FIG. 12 is a perspective view showing a cassette mounted, detection of a remaining sheet amount when there is no sheet, and a display unit thereof.

FIG. 13 is a sectional view showing a slide portion of the tray.

FIG. 14 is a sectional view showing a cassette insertion portion (rail) of the base.

FIG. 15 is an overall perspective view of a sheet cassette.

FIG. 16 is an exploded perspective view of a sheet cassette.

FIG. 17 is a plan view of a paper feed cassette.

FIG. 18 is an overall perspective view of a cassette.

FIG. 19 is a plan view of a cassette.

FIG. 20 is an overall perspective view of a side guide.

FIG. 21 is a side view of a side guide.

FIG. 22 is an overall perspective view of a separation claw A;

FIG. 23 is an overall perspective view of a separation claw B;

FIG. 24 is a side view of a rear end regulating plate.

FIG. 25 is a conceptual diagram when a paper cassette is mounted.

FIG. 26 is a conceptual diagram of a non-reference end of a stacked sheet;

FIG. 27 is a front view of an ASF unit.

FIG. 28 is a top view of the ASF unit.

FIG. 29 is a right side view of the ASF unit.

FIG. 30 is a left side view of the ASF unit.

FIG. 31 is a schematic front view of an ASF unit.

FIG. 32 is a schematic top view of an ASF unit.

FIG. 33 is a rear view of a substantially ASF unit.

FIG. 34 is a sectional view of an ASF unit.

FIG. 35 is a sectional view of an ASF unit.

FIG. 36 is a schematic cross-sectional view of a sheet feeding path (in a sheet feeding waiting state).

FIG. 37 is a schematic sectional view of a sheet feeding path (sheet pickup).

FIG. 38 is a schematic sectional view of a sheet feeding path (sheet conveyance).

FIG. 39 is a schematic cross-sectional view of a paper feeding path (U-turn roller retracted).

FIG. 40 is a gear train diagram of a feed shaft driving system.

FIG. 41 is a diagram showing the configuration of an ASF clutch.

FIG. 42 is a view showing a state where a U-turn roller appears and disappears.

FIG. 43 is a U-turn roller retracted state diagram.

FIG. 44 is a phase relationship diagram of a cam planet holder, a cam sun gear, a cam planet gear, and a cam gear.

FIG. 45 is a U-turn roller drive system diagram (pinion gear CW).
rotation)

FIG. 46: U-turn roller drive system diagram (pinion gear CC)
W rotation)

FIG. 47 is a diagram showing a lock mechanism of an ASF clutch (CCW rotation locked state).

FIG. 48 is a diagram showing a lock mechanism of an ASF clutch (unlocking operation).

FIG. 49 is a diagram showing a lock mechanism of an ASF clutch (clutch output shaft CW rotating state).

FIG. 50 is a diagram showing a lock mechanism of an ASF clutch (in a CW rotation locked state).

FIG. 51 is an enlarged view of a lock elastic portion of the ASF lock.

FIG. 52 is an enlarged view of a drive protrusion of the U-turn roller holder A.

FIG. 53 is an enlarged view of a lock release unit (release operation).

FIG. 54 is an enlarged view of a lock release portion (a kick elastic portion kicking operation).

FIG. 55 is an automatic sheet feeding flowchart (basic flow).

FIG. 56 is an automatic sheet feeding flowchart (basic flow).

FIG. 57 is an automatic sheet feeding flowchart (forced sheet ejection flow).

FIG. 58 is an automatic sheet feeding flowchart (evacuation flow).

FIG. 59 is a block diagram of a control system.

FIG. 60 is an exploded perspective view of the internal configuration of a printing apparatus printer according to an embodiment of the present invention, as viewed from the paper discharge side.

FIG. 61 is an enlarged perspective view of a platen of a printer of a recording apparatus according to an embodiment of the present invention as viewed from a sheet discharge side.

FIG. 62 is a side sectional view of a printing apparatus printer unit according to an embodiment of the present invention.

FIG. 63 is a diagram showing a piston drive transmission path from a paper feed motor to a recovery system of the printer unit of the recording apparatus according to the embodiment of the present invention.

FIG. 64 is an enlarged view around a switching mechanism of a printing apparatus printer according to an embodiment of the present invention;

FIG. 65 is a view showing an engagement shape of the LF gear and the trigger gear shown in FIG. 64;

FIG. 66 is a diagram showing a configuration and arrangement of a pump gear and a trigger gear shown in FIG. 64;

FIG. 67 is an explanatory diagram of an operation of a recovery system in a printing apparatus printer unit according to an embodiment of the present invention.

FIG. 68 is an explanatory diagram of an operation of a recovery system in the printing apparatus printer unit according to an embodiment of the present invention.

FIG. 69 is an explanatory diagram of an operation of a recovery system in the printing apparatus printer unit according to an embodiment of the present invention;

FIG. 70 is an explanatory diagram of an operation of a recovery system in a printing apparatus printer unit according to an embodiment of the present invention.

FIG. 71 is an explanatory diagram of an operation of a recovery system in the printing apparatus printer unit according to an embodiment of the present invention.

FIG. 72 is an explanatory diagram of an operation of a recovery system in the printing apparatus printer unit according to an embodiment of the present invention;

FIG. 73 is a perspective view of the carrier section when no head section is mounted.

FIG. 74 is a perspective view of a monochrome recording head used in a printer of a recording apparatus according to an embodiment of the present invention.

FIG. 75 is a perspective view of a color recording head used in a printer of a recording apparatus according to an embodiment of the present invention.

FIG. 76 is a perspective view of a scanner head used in a printer of a printing apparatus according to an embodiment of the present invention.

FIG. 77 is a schematic sectional view and a perspective view of a scanner head used in a printer unit of a printing apparatus according to an embodiment of the present invention.

FIG. 78 is a flowchart showing a recovery operation during printing used in the printer unit of the recording apparatus according to the embodiment of the present invention;

FIG. 79 is a perspective view of the attachment / detachment of the paper feed cassette.

FIG. 80 is a conceptual view of a conventional sheet feeding apparatus as viewed from above.

[Explanation of symbols]

 Reference Signs List 100 apparatus main body 101 base 101a indicator section 101b surface 101c, 101d bearing 101e hole 101f hole 101g guide rib 101h bearing 101i rubber foot positioning convex part 101j pull-out cue part 101k transport Cue part 101l: dummy foot 101m: cassette abutting reference surface 101n: cassette click convex portion 101o: tray slide surface 101p: tray stopper 101q: cassette support surface 101r: taper surface 101s: cutout portion 101t: taper surface 101w: cassette support Surface 102: Main case 102a: Selection switch 102b: Recording sheet discharge unit 102c, 102d: Rib 102e: Manual feed slot 102h: Rib 102i: Latch 103: Paper cassette 104 ... operation panel 104a ... power switch 104b ... reset switch 104c, 104g ... ink remaining amount display 104d ... power supply display 104e ... data transfer display 104f ... error display 105 ... paper ejection cover 106 ... access cover 106a ... lever part 107 ... access cover Lock 108: manual feed cover 108a: manual feed sub-tray 109: U-turn cover 109a: guide rib 109b: shaft 110: discharge tray 110a: claw 110b: convex portion 110c: rib 110d: slide rib 111: recording sheet 111a: sheet 112: ASF Units 112a, 112b: Guide surface 112c: Separation roller rubber 112d: U-turn roller 112e: Paper feed roller 113: U-turn pinch roller 114: Paper passing guide 1 4a ... guide surface 114b ... guide rib 201 ... base cassette 201a ... reference guide member 201b ... sheet front end abutment surface 201c ... bank 201d, 201e ... rail 201f, 201g ... taper portion 201h ... concave portion 201i ... reference side surface 201l ... concave portion 201m ... hand Handle part 201n ... spacer 201o, 201p ... pressure plate mounting shaft 201q ... latch 201r ... shaft 201s ... stopper 201t ... gap 201u ... bearing 201v ... rear end regulating rib 201w ... surface 201x ... step 202 ... pressure plate 203 ... pressure plate spring 204 ... separation sheet 205 ... side guide 205a ... latch 205b ... operating part 205c ... shaft 205d ... rib 205e ... guide surface 205f ... stopper 205g ... eaves 206 ... tip holding springs 206a, 206b ... Pressing part 207 ... Separation claw A 207a ... Separation part 207b, 208c ... Abutment wall 207c, 208d ... Slanting side 208 ... Separation claw B 208b ... Groove 209 ... Rear end regulating plate 209a ... Guide surface 209b ... Shaft 209c ... Cam 301 ... Operation panel board 302 Main board 303 PWB chassis 304 PWB guard 305 Pinch roller shaft 306 Lock nut 307 Cassette side holder 307a Fixed end 307b Free end 308 Frame 308d Stopper part 309 Lever 309a Arm 309b ... gear part 309c ... spring hook part 309d ... cam part 309f, 311e ... shaft end 310 ... drum 310b ... gear part 310c, 310d ... outer peripheral surface 310e ... edge part 311 ... cam 311a ... first cam part 311b ... second Mosquito Part 312: Torsion coil spring 313: Tension spring 314: Display window 315: Rubber foot 316: Quick sheet 316a: Rotating hole 316b: Clue part 401: Frame A 402: Frame B 403: U-turn guide A 404: U-turn guide B 405: Feeding shaft 406: ASF motor 407: Bearing A 408: Motor flange retainer 409: Elastic part 410: Flange retaining projection 411: Bearing B 412: U-turn idler gear A 413: Bearing C 414: U-turn roller shaft 415 … Pinion gear 416… U-turn roller holder A 417… U-turn roller holder B 418… Support shaft 419… Support shaft 420… Cam A 420a… Cam surface 420b… Overcam A 420c… Overcam B 420d… Camst 421… Cam B 421a… Cam surface 422… Up cam follower 423… Down cam follower 424… Up cam follower 425… Down cam follower 426… Motor reduction gear 426a… Input gear 426b… Output gear 427… Feeding reduction gear 427a… Input gear 427b Output gear A 427c Output gear B 428 Feeder idler gear 429 ASF clutch 429a Input gear 429b Output shaft 429c Release collar 429d Clutch spring 429e Locking portion 429f Flange locking portion 429g Notch groove 429h ... end 429i ... end 429k ... notch 430 ... cam sun gear 430a ... flange 431 ... cam planet gear A 432 ... cam planet gear B 433 ... cam gear 433a ... power Gear A 433b… Cam gear B 433c… Toothless part A 433d… Toothless part B 433e… Final tooth A 433f… Final tooth B 434… Cam planet holder 434a… Planet stopper 435… Cam planet holder spring 436… Stopper rib 436b… Stopper rib A 436 … Stopper rib B 437… U-turn sun gear 438… U-turn planetary gear A 439… U-turn planetary gear B 440… U-turn idler gear B 441… U-turn roller gear 442… U-turn planetary holder 443… U-turn planetary holder spring 444… ASF lock 444a ... lock claw 444b ... lock elastic part 444c ... lock sensor plate 444d ... rotation shaft 445 ... lock spring 446 ... driven protrusion 446a ... driven ridgeline 446b ... driven slope 447 ... drive protrusion 447a ... drive slant Surface 447b… Drive ridgeline 448… Lock claw shaft 449… U-turn reduction gear 449a… Input gear 449b… Output gear 450… ASF sensor 451… Cam shaft 500… Cover arm 501… Cover switch 502… Flapper 503… Recording sheet conveyance path 504 ... Recording sheet transport path 600 Printer unit 601 Recording head cartridge 602 Recording head 603 Ink tank 603a Color ink tank 603b Black ink tank 603c Monochrome ink tank 603d Latch section 604 Carrier 604a, 604b Head section Positioning projection 604c Clutch switching projection 605 Printer frame 606 Guide shaft 607 Guide rail 608 Carrier motor 609 Paper feed motor 609a LF motor gear 610 drive pulley 611 idler pulley 612 belt 613 home position sensor 614 flexible cable 614a cable terminal 615 flexible guide 620 paper feed roller 621 LF gear 621a contact surface 621b gear 622 ... Platen 622a ... Paper guide part 622b ... Rib 622c ... Recess 622d ... Spring regulating part 623 ... Waste ink absorber 624 ... Pinch roller holder 625 ... Pinch roller 626 ... Discharge roller 627 ... Idler gear train 628 ... Spur 629 ... Paper sensor 630 ... Paper discharge sensor 631 LF double gear 632 Trigger gear 632a Contact surface 632b Gear 633 Pump gear 633a Notch 633b Cap control Section 633c ... concave wall surface 634 ... cylinder gear 634a ... boss 635 ... cylinder 635a ... cylinder arm section 635b ... joint section 635c ... ink suction port 635d ... cylinder control section 635e ... guide 635f ... space 635g ... cylinder end section 635h ... space 636 ... Cap 636a ... Joint section 637 ... Cap holder 637a ... Stopper 638 ... Cap spring 639 ... Cap control spring 640 ... Piston shaft 640a ... Lead groove 640b ... Groove 640c, 640d ... Flange section 641 ... Piston 641a ... Rib 642 ... Cylinder seal 643 ... Cylinder absorber 644 ... Blade 650 ... Monochrome recording head 651 ... Color recording head 652 ... Scanner head 652b ... Reading surface 653 ... Head terminal part 654 ... Positioning notch 655 ... Positioning hole 656 ... Contact spring 657 ... Head guide 658 ... Monochrome recording head cartridge 658a, 659a, 652a ... Head part attaching / detaching operation part 658b ... Discharge port surface 659 ... Color recording head cartridge 659b ... Discharge port surface 670 ... LED 671 ... Sensor 672 ... LED light 673 ... LED opening 674 ... Sensor opening 675 ... Document surface 676 ... Image light 677 ... Field lens 678 ... Mirror 679 ... Imaging lens 680 ... ... claw part 701 ... controller 702 ... MPU 703 ... RAM 704 ... ROM 705 ... ASF driver 706 ... carrier driver 707 ... paper feed driver

Claims (5)

[Claims] A cassette on which a plurality of sheets can be stacked; a reference guide member that regulates and guides one side in a width direction of the sheet serving as a reference side; and a sheet serving as a non-reference side facing the reference side. A side guide that regulates and guides the other side in the width direction of the sheet, a side urging unit that urges the non-reference side of the sheet toward the reference guide member, A separation claw that separates the sheets one by one; and a feeding unit that is positioned upstream of the separation claw in the conveyance direction and feeds the sheets one by one from the top. A sheet feeding apparatus, wherein the non-reference side separation claw is offset from the reference guide member so as to make the hook amount of the non-reference side separation claw on the sheet substantially constant. 2. An offset amount of said non-reference side separating claw toward said reference guide member is smaller than a stroke amount of said side urging means toward said reference guide member side. 3. The sheet feeding device according to 1. 3. The side guide is a guide that is slidable in the sheet width direction and is capable of regulating and releasing the position by engaging and releasing a corresponding latch. The sheet feeding device according to claim 1, wherein a stroke amount toward the reference guide member is larger than a movement pitch amount of the side guide in a sheet width direction or an interval between latching means. 4. An image processing apparatus comprising: a sheet supply unit that feeds sheets one by one; and an image processing unit that performs image processing on a sheet supplied from the sheet supply unit. An image processing apparatus comprising the sheet feeding device according to any one of claims 1 to 3. 5. The image processing apparatus according to claim 4, wherein the image processing unit is a recording unit that records an image on a sheet or a reading unit that reads an image on a sheet.