JP2001022137A - Sheet material carrying device and image reading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To move a stopper member without using a solenoid by providing a drive transmission means with a delay transmission mechanism which transmits drive force of a diving means to the stopper member, and then transmits the drive force to a preliminary carrying means. SOLUTION: When documents are deeply inserted in the direction of the arrow G, the leading ends of the documents butt against a stopper member 68. When an instruction to send a signal is given on the operation panel of an operating part, a drive motor rotates to rotate and drive a required gear. Consequently an ejecting roller and a carrying roller 17a are rotated in a sheet carrying direction and also a separating roller 16a and a preliminary carrying roller 51 are rotated in the sheet carrying direction with delay caused by a mechanical timer. Thus, while the documents held between the preliminary carrying roller 51 and a preliminary carrying press plate 77, constituting a preliminary carrying part are handled by the preliminary carrying part, they are sent between the separating roller 16a and separating piece constituting a document separating part, where they are separated one by one, and each is sent to the carrying roller 17a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a sheet conveying apparatus for sequentially conveying a plurality of sheet members, and an image reading apparatus using the sheet conveying apparatus.

[0002]

2. Description of the Related Art Conventionally, an image forming apparatus such as a facsimile has a document reading device as image input means for inputting image information of a document. In this document reading apparatus, a document using a plurality of sheet materials (hereinafter, referred to as a document)
It is called a compound leaf manuscript. ) Is provided, there is provided a sheet material conveying device that separates the sheets one by one and conveys them to an image input unit (image reading unit).

In a sheet conveying apparatus, a preliminary conveying roller for picking up a lowermost (or uppermost) sheet from a multi-leaf original placed on a sheet mounting surface and preliminarily conveying the sheet to a sheet conveying path; A plurality of rollers such as a separation conveyance roller for separating the originals fed by the conveyance rollers one by one and conveying the originals to the image input unit side are provided. Further, in the sheet material conveying apparatus, a stopper member for stopping and holding the multi-leaf original at a stage after the preliminary conveying roller and before the separation conveying roller is provided.

If the user pushes the multi-leaf original to the position of the separation / conveying roller at a stretch, the stopper member cannot separate the multi-leaf original by the separating / conveying roller. It has a function to hold.

When inputting image information of an original in an original reading apparatus having such a sheet conveying apparatus, the stopper member is retracted to release the stop of the multi-leaf original, and the preliminary conveying roller is rotated. As a result, the sheet material is taken out one by one from the multi-leaf original document and fed to the separation / conveyance roller at the subsequent stage. And is conveyed to a subsequent image reading means to read the image information of the document.

Conventionally, as a document reading apparatus in an image forming apparatus such as a facsimile apparatus, the one shown in FIGS. 13 to 16 has been proposed.

FIG. 16 is an external view of a facsimile apparatus. In this facsimile apparatus, an image placing section for placing an original on the upper right side in FIG. 16 and an openable / closable cover section on the upper left side are shown. A reading means is disposed, and the multi-leaf originals stacked with the original surface (image surface) facing down on the original placing portion are sequentially conveyed to the image reading unit from the lowermost layer, and are placed on the original discharge tray 114. Is discharged to Further, a sheet stacking unit 20 on which a sheet material for recording is stacked
To the sheet material from 0, 201, and 202, a toner image corresponding to an image signal formed by an image forming unit (not shown) is transferred, and is discharged onto a recording paper discharge tray 203 via a fixing device (not shown). It has become so.

[0008] As shown in FIG.
Various rollers and the like are arranged above and below a sheet guide 102 which is connected to the sheet mounting table 101 and forms a document conveyance path. A preliminary conveyance roller 103 having a D-shaped cross section is disposed at the center of the sheet guide 102 in the width direction on the upstream side in the document conveyance direction, so that the D-cut surface of the preliminary conveyance roller 103 does not protrude above the sheet guide 102. Has become.

Further, a plate-shaped weight plate 104 is swingably provided on the cover portion so as to face the preliminary transport roller 103. A lower separation roller 105 and an upper separation roller 106 for separating and conveying the multi-fed original are arranged downstream of the sheet guide 102 in the document conveyance direction following the preliminary conveyance roller 103, and further downstream. Lower transport roller 1
07, an upper conveying roller 108, an image reading unit 111 for reading an image of a document, a lower discharging roller 112 and an upper discharging roller 11 for discharging a document to a document discharging tray 108.
3 are arranged.

Upper separating roller 106 and upper conveying roller 108
Is attached to the pressure lever 109 attached to the cover, and comes into pressure contact with the lower separation roller 105 and the lower transport roller 107 by the spring force of the pressure spring 110, respectively. An upper discharge roller 113 is also attached to the cover, and the document can be removed from the sheet guide 102 by opening the cover.

Further, between the preliminary transport roller 103 and the lower separation roller 105, a locking claw 1 of a stopper member 121 is provided.
22 can project from the sheet guide 102,
The leading edge of the multi-leaf original loaded on the original placing portion is pushed in until the leading edge of the double-leaf original comes into contact with the locking claw 122 through the position where the preliminary transport roller 103 and the weight plate 104 face each other.

Preliminary conveyance roller 103, lower separation roller 10
5. The drive of the lower transport roller 107 and the stopper member 121 is performed by a drive mechanism shown in FIG. 14 by one pulse motor (not shown) via a gear train. A gear of a drive shaft 115 connected to a pulse motor (not shown) meshes with a gear (a part of the second gear train G2) at one end of a separation roller shaft 105a having a lower separation roller 105 to rotate the lower separation roller 105. Let it. A gear (a part of the first gear train G1) on the other end side of the separation roller shaft 105a meshes with an idler gear of the first gear train G1, and this idler gear is input to a spring clutch 116 connected to the preliminary transport roller 103. It is in mesh with the gear attached to the shaft.

The spring clutch 116 generates a frictional force when the locking claw member 118 driven by the solenoid 117 is engaged with the locking portion 116B of the control ring 116A, and rotates the preliminary conveying roller 103. The preliminary transport roller 103 is intermittently driven to make one rotation with the position where the D-cut surface is on the upper side as a stop position, and the solenoid 117 is energized when image information reading is started.
Power is cut off at the timing of rotation. While the preliminary transport roller 103 makes one rotation, the leading edge of the document is
5, and the D-cut surface of the preliminary transport roller 103 faces upward and does not protrude above the sheet guide 102, so that the transport of the original by the separation rollers 105 and 106 is not affected.

When the pre-conveyance roller 103 is driven, the stopper member 121 is also driven, and its locking claw 122
Retreats below the sheet guide 102. This driving operation is performed by transmitting the driving force of the driving shaft 115 to the one-way clutch 128 such as a spring clutch via the second gear train G2. The one-way clutch 128 in the stopper member 121 does not transmit the rotation in the forward rotation direction but transmits the rotation in the reverse rotation direction, assuming that the direction in which the other rollers rotate for document conveyance is the forward rotation direction. It is configured as follows.

As shown in FIG. 15, a stopper member 12 is provided on a cam surface of a cam member 123 which rotates integrally with the cam shaft 127.
One cam follower 124 is in contact with the stopper member 121. The stopper member 121 is provided with a locking claw 122 at one end, and is rotatable around a pivot 121B at the other end. The locking claw portion 12 of the stopper member 121 shown in FIG.
When the cam shaft 127 rotates in the reverse direction as shown in (2) from the state in which the double-sided document 2 is locked by projecting from the hole 102A of the sheet guide 102, the stopper member 121 also rotates in the reverse direction, and the locking claw portion is gradually rotated. 122 starts retreating into the hole 102A. Then, when the locking portion 126 of the cam member 123 passes through the locking portion 125 of the stopper member 121 as shown in (3), the reverse rotation of the motor is stopped. The reverse rotation control of this motor is based on the standby state shown in FIG.
Until the state of (3), that is, the locking portion 126 is
25, until the stopper member 121 is completely lowered.
The motor is driven by a fixed amount by pulse control, and the number of drive pulses at that time is determined by the shape of the cam member 123.

As a result, the locking of the double leaf document is released,
Next, the motor is rotated in the forward direction for document conveyance. At this time, since the locking portion 125 of the stopper member 121 and the locking portion 126 of the cam member 123 are engaged, the one-way clutch 128 idles, and as shown in (4), the stopper member 121 rises. This is continued until the document conveyance is completed.

When the last discharge of the original by the discharge roller pairs 112 and 123 is detected by the detecting means (not shown), as shown in (5), the predetermined number of pulses for the standby state of (1) is obtained. Reverse the motor.

[0018]

However, in the above-described sheet conveying apparatus of the conventional image forming apparatus, the use of the solenoid 117 for moving the stopper member 121 increases the cost and increases the cost for disposing the solenoid 117. Space needs to be secured, which hinders miniaturization of the device. In addition, since the bundle is pulled out from the solenoid 117, the mounting operation is complicated when assembling the unit of the sheet material conveying device. Further, the power consumption of the solenoid 117 itself is large, and it is necessary to increase the capacity of the power supply, which has been a factor of increasing the cost of the power supply.

An object of the present invention is to provide a low-cost and compact sheet conveying device which enables movement of a stopper member without using a solenoid, and an image reading device provided with the sheet conveying device. To provide.

[0020]

According to the present invention, there is provided a sheet conveying apparatus which solves the above-mentioned problems, comprises a preliminary conveying means for preliminarily conveying a sheet material stacked on a sheet mounting surface to a sheet conveying path, and a preliminary conveying means. A separating and conveying means which is arranged at the subsequent stage and separates and conveys the sheet material preliminarily conveyed by the preliminary conveying means; and A stopper member for stopping the sheet material at a preceding stage of the separation / conveying means by a rotation in a closing direction with respect to the path, a driving means for supplying a driving force to the separation / conveying means, and a stopper for controlling the driving force of the driving means supplied to the separation / conveying means A drive transmission unit that transmits the driving force to the member and the preliminary conveyance unit, wherein the drive transmission unit includes a delay transmission mechanism that transmits the driving force of the driving unit to the stopper member and then transmits the driving force to the preliminary conveyance unit. .

The preliminary conveying means includes a preliminary conveying surface protruding from the sheet mounting surface and a standby surface not protruding from the sheet mounting surface, and the state of protruding from the sheet mounting surface changes depending on the rotation angle. And a preliminary transport roller.

In this case, it is preferable to provide an initial position holding mechanism for holding the preliminary conveyance roller at a rotational position that does not protrude from the sheet mounting surface in the initial state of the start of the conveyance of the sheet material.

The initial position holding mechanism presses the flat portion having a substantially D-shaped cross section provided on the shaft portion of the preliminary transport roller and the shaft portion of the preliminary transport roller, and presses the planar portion at the initial position at the start of sheet material transport. And a plate-like elastic member that elastically abuts the portion and imparts resistance to the rotation direction to the preliminary transport roller.

The separation / conveying means includes at least a conveying roller that is rotationally driven by the driving means, a driven roller that is in pressure contact with the conveying roller and is driven in the reverse direction based on the rotation of the conveying roller, A separation roller that rotates in a sheet material conveyance direction based on the rotation of the conveyance roller, and the drive transmission unit transmits the rotation driving force to the preliminary conveyance roller based on the rotation of the separation roller. And an engagement portion for rotating the stopper member by engaging with the stopper member.

Further, the drive means is a rotary motor, and the drive transmission means has a transmission shaft for transmitting the rotational driving force of the rotary motor transmitted to the transport roller to the separation roller, and the transmission shaft has a drive roller of the transport roller. A configuration is provided that includes a delay transmission mechanism that transmits the rotational driving force of the rotary motor so that the rotation start of the separation roller based on the rotation start is delayed at a predetermined timing.

In this case, there is provided an initialization mechanism for returning the preliminary conveyance roller to the initial position where the conveyance of the sheet material is started by driving the rotary motor in the reverse direction.

An image reading apparatus according to the present invention includes: a sheet conveying apparatus having any one of the above-described structures; an image reading section disposed downstream of the separating and conveying section for inputting image information of an image surface of the sheet; And a sheet material discharging means disposed at a subsequent stage of the reading means and discharging the sheet material.

The sheet material discharging means is driven by a driving means.

[0029]

Embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiment, an example in which the present invention is applied to a facsimile machine will be described.

A facsimile apparatus according to an embodiment of the present invention uses a recording system generally called an ink jet recording apparatus. FIG. 1 is a central sectional view of the facsimile apparatus, and FIG. FIG. 3 shows an electric signal control block.

FIG. 4 is a plan view of a lower document frame unit of a document reading system including a sheet material conveying device provided in the facsimile apparatus, and FIG. 5 is a plan view of an upper document frame unit in the document reading system. 6 shows the configuration of the preliminary transport roller unit in the lower document frame unit, FIG. 7 shows the configuration of the separation roller unit in the lower document frame unit, and FIG. 8 shows each drive gear seen from the direction of arrow F in FIG. FIG. 9 illustrates the movement of the stopper, FIG. 10 illustrates the configuration of the stop spring, and the phase relationship of the preliminary conveyance roller and the like in the initial state. FIG. 11 illustrates the movement of the preliminary conveyance roller and the spring clutch. FIG. 12 shows the operation sequence of the rollers.

First, an overall configuration of a facsimile apparatus according to an embodiment will be described with reference to FIGS.

The facsimile apparatus according to the present embodiment has a two-stage paper feed cassette 1 below a main body 7 as a housing.
a, 1b are detachably arranged, and the sheet cassettes 1a, 1b
The recording sheets 2 stacked on the sheet are fed to a recording system B of an ink jet system by a sheet feeding system A, and are discharged in the direction of arrow a to a discharge path by a discharge roller 10a and a spur 10b, and further discharged rollers 11a and 11b. Upper cassette 1a
To the outside of the machine above the.

For the upper and lower paper cassettes 1a and 1b, a paper feed mechanism having the same configuration is disposed, and the uppermost paper feed mechanism is brought into contact with the claw 4 (4a, 4b) of the paper feed cassette 1 (1a, 1b). The recording sheet 2 (2a, 2b) at the position is fed by the feed roller 3 (3
a, 3b), and is sent to a nip portion of a pair of feed rollers 5a and 5b.
The data is sent to the recording system B by a and 5b.

The recording system B is configured such that a carriage 31 on which an ink head having an ink cartridge 9 is mounted is movable in a width direction (main scanning direction) with respect to a platen 30, and a recording sheet 2 supported by a platen roller 8. Is printed. The ink head of the ink cartridge 9 feeds an image based on an image signal transmitted from another device, an image signal transmitted from a document reading system C described later, and image data output from a computer or the like described later. An image is recorded on the recording sheet 2 supplied from the cassette 1. The ink cartridge 9 can be replaced by opening the recording cover 12 in the direction of arrow c and pulling it out in the direction of arrow d.

In this facsimile apparatus, the original reading system C
And an operation unit D, a document reading device is configured. The document reading device is disposed at an upper portion of the apparatus main body 7 and feeds the document 13 in the same direction as the mounting direction of the sheet feeding cassette 1. A document surface (image surface) on which an image such as a character graphic is described is read.

The document reading system C of the document reading apparatus includes a document tray 15 on which a document made of a plurality of sheet materials (hereinafter, referred to as a multi-leaf document) is placed with the image surface facing down, A preliminary transport unit including a preliminary transport roller 51 and a preliminary transport pressing plate 77 for picking up the lowermost sheet material from the multi-leaf originals stacked on the surface and preliminarily transporting the sheet material to the sheet transport path, and a sheet preliminary transported by the preliminary transport unit A document separation unit including a separation roller 16a that separates sheets one by one and conveys the document to the document reading unit and a separation piece 16b that presses against the document separation unit, and conveyance by a conveyance roller 17a and a conveyance roller 17b located downstream of the document separation unit Roller pair,
A discharge roller pair including a discharge roller 18a and a discharge roller 18b, a stopper member 68 disposed in a stage subsequent to the preliminary transport roller 51, which will be described in detail later, and a photoelectric conversion element 19 as a document reading unit using a contact sensor or the like are provided. .
In the document reading system C, the document tray 15, the preliminary transport roller 5
1. Each of a separation roller 16a, a transport roller 17a, a discharge roller 18a, and a photoelectric conversion element 19 is attached to a lower original frame 50 in the apparatus main body 7. On the other hand, the preliminary transport pressing plate 77 and the spring 78 for urging the preliminary transport pressing plate 77 toward the lower document frame 50, the separation piece 16b, and the transport roller 1
7b, the discharge roller 18b, and the stopper member 68 are attached to the upper document frame 61.

In the original reading system C, the multi-leaf original placed on the sheet placing surface of the original tray 15 is taken out one by one by the preliminary transport unit in the preliminary transport roller unit 301 described later with reference to FIG. Are fed to the separation roller unit 302, and even if double feeding of the sheet material occurs at this time, the sheets are separated and fed one by one by the document separation unit of the separation roller unit 302, and separated and fed. The sheet material is conveyed by a pair of conveying rollers 17a and 17b and a pair of discharge rollers 18a and 18b and discharged out of the apparatus (on the recording cover 12). Until the sheet material is discharged, the image information on the image surface is read by the document reading means by the photoelectric conversion element 19, and the image signal is transmitted to its own recording system in the case of the copy mode. In the case of the transmission mode, the data is transmitted to the recording system of another device. The configuration and operation of the stopper member 68 in the document reading system C will be described later.

The operation unit D of the document reading apparatus is used to perform a mode switching operation for switching between a copy mode, a transmission mode, and a printer mode, and various copy, transmission, and various settings for the printer. Keys are provided according to. This operation unit D
Is configured to be rotatable in a direction indicated by an arrow e in FIG. 1 integrally with a unit of an upper document frame 61 to be described later with respect to the apparatus body 7. Also, the jam can be easily released.

Next, a control system of the facsimile apparatus will be described with reference to a block diagram shown in FIG.

As shown in FIG. 3, the control system of the facsimile apparatus includes a facsimile control unit 121, a power supply unit 122 for supplying power to the entire apparatus, a modem 123, a telephone (handset) 124, and a line 125. An NCU board unit 126, a display unit 127 for displaying the contents input from the operation unit D, a control unit 128 for the recording system B, and a printer for obtaining data from the peripheral computer 129. It has an interface 130 and the like.

The control unit 121 is a CPU 131 for controlling the entire facsimile apparatus, a ROM 132 for storing various programs and various data, and is used as a work area of the CPU 131 and temporarily stores various data such as the number of recordings. , A line memory 134 described later, an encoding / decoding unit 135, a memory buffer 136, and an input / output switching interface 137 for switching between a facsimile and a printer.

The line memory 134 of the control section 121 stores the image of each line of the image data. When the original 13 is transmitted or copied, one line from the original reading system C described above is stored. Image data is stored, and in the case of receiving image data, the decoded 1
Line data is stored. The image data stored in the line memory 134 passes through the CPU 131, adds a recording system control code, and sends the CPU 138 of the control unit 128 of the recording system B from the input / output switching interface 137.
The image is recorded by the CPU B1 decoding the recording system control code.

The encoding / decoding section 135 reads out the coded image data stored in the line memory 134, decodes it, and converts it into image data. Further, the encoding / decoding unit 135 includes the modem 123 and the memory buffer 13.
6 is encoded in a format such as MH encoding. The memory buffer 136 is a CPU
131, the encoding / decoding unit 135, and the encoded image data transmitted and received from the modem 123.

To explain the control of the print function, first, the data and the recording system control code output from the peripheral computer 129 are taken into the input / output switching interface 137 via the printer interface 130. Then, the data and the recording system control code are output from the input / output switching interface 137 to the CPU 138 of the control unit 128 in the recording system B.
8 decodes the recording system control code to perform print recording. At this time, the CP in the control unit 121
In U131, print recording control is not performed. With such control, the facsimile function and the print function are simplified.

Next, a sheet conveying device provided in the original reading system C of the facsimile apparatus will be described in detail.

First, the configuration of the lower document frame 50 of the sheet conveying apparatus will be described with reference to FIG.

At the substantial center of the lower document frame 50, the above-described three transport rollers 17a are arranged in the longitudinal direction. Each of the transport rollers 17a is coaxially and integrally rotatably disposed, and a gear 75 described later with reference to FIG. 8 is attached to one end of a shaft portion of the transport roller 17a.

On the downstream side of the transport roller 17a in the lower document frame 50, the above-mentioned photoelectric conversion element 19 is mounted substantially parallel to each transport roller 17a.

Further, on the downstream side of the photoelectric conversion element 19 in the lower document frame 50, the above-mentioned three discharge rollers 18a are arranged in the longitudinal direction.
It is provided at a position corresponding to each transport roller 17a.
Each of the discharge rollers 18a is coaxially and integrally rotatably disposed, and a gear 74 described later with reference to FIG. 8 is attached to one end of a shaft portion of the discharge roller 18a.

On the other hand, on the most upstream side of the lower document frame 50, the separation roller 16a, the gear 55, the spring clutch 56,
A separation roller unit 302 including a gear 57, a metal separation roller shaft 58 to which the gears 57 are attached, a preliminary conveyance roller 51, a clutch shaft 52, and a preliminary conveyance roller shaft 5.
3. A preliminary idler gear 5 for rotating the preliminary transport roller unit 301 including the spring clutch 54 and the like, and rotating the preliminary transport roller 51 in a direction opposite to the transport direction of the document 13.
9 (59a, 59b), the preliminary transport roller 51
Idler gear 60 (6)
0a, 60b) and the like.

A transmission shaft 72 is rotatably supported on the lower document frame 50 downstream of the separation roller unit 302 and upstream of the transport roller 17a.
The transmission shaft 72 has a gear 76 to be described later with reference to FIG. 8 attached to one end side (the left side in FIG. 4). On the other hand, a mechanical timer 99 is fixedly formed on the other end side of the transmission shaft 72, and a gear 73 is rotatably connected to the mechanical timer 99. As a result, as described later with reference to FIG.
The rotation of the transmission shaft 72 is transmitted to the gear 73 with a time delay by the mechanical timer 99. The rotation of the gear 73 is further transmitted to the gear 55 of the separation roller unit 302 and the A idler gear 59 of the preliminary transport roller unit 301, and this operation will be described later.

Next, the configuration of the upper document frame 61 of the sheet conveying apparatus will be described with reference to FIG.

In the sheet conveying apparatus, as shown in FIG. 5, the separation pieces 16 opposed to the separation rollers 16a are used.
b and a separation spring 16c pressing the separation piece 16b against the separation roller 16a are attached to the shaft support of the upper document frame 61. A DS actuator 69 for detecting that the document 13 has been inserted and a DES actuator 70 for detecting the timing of starting reading are supported by the upper document frame 61.

The photo interrupter interrupted by the actuators 69 and 70 is mounted on the back surface of the board of the operation panel (not shown) of the operation section D, and is configured to function when the operation panel is attached.

At substantially the center of the upper document frame 61, a transport roller shaft 65a is rotatably supported. The transport roller shaft 65a has a transport roller short 66, a stopper roller 67, and three transport rollers 17b. Installed. That is, the transport roller 17b facing the transport roller 17a is rotatably supported by the upper document frame 61 via the transport roller shaft 65a. The transport roller short 66 and the stopper roller 67 are also supported by the upper document frame 61 via the transport roller shaft 65a.

The stopper member 68 is, as shown in FIG.
The stopper roller 67 is supported at a position near the stopper roller 67 and the separation piece 16 b in the upper document frame 61.
When the 7 rotates, it engages with the engaging portion 67a and swings up and down.

The transport roller shaft 6 in the upper document frame 61
On the downstream side of 5a, a discharge roller shaft 63a to which three discharge rollers 18b are attached is rotatably supported. The transport roller shaft 65a and the discharge roller shaft 63a are pressed by a shaft pressing spring 62 fixed between the upper document frame 61 and the upper document stay 71.

Next, the configuration of the preliminary transport roller unit 301 on the lower document frame 50 will be described with reference to FIG. As shown in FIG. 6A, the preliminary transport roller 51 of the preliminary transport roller unit 301 is inserted into the preliminary transport roller shaft 53 and rotates integrally with the preliminary transport roller shaft 53.

As shown in FIG. 6B, the preliminary transport roller 51 has a distorted circular cross section in which the distance from the center of rotation to the roller surface is not constant, and the roller surface having a high curvature holds the original. A preliminary transport surface 51a for preliminary transport is provided, and a roller surface having a low curvature is a standby surface 51b. The preliminary conveyance roller 51 changes the state of projection of the document tray 15 with respect to the sheet mounting surface depending on the rotation angle. As will be described later with reference to FIGS. By rotating from this initial state without the surface 51b facing upward and protruding from the sheet mounting surface, the preliminary conveyance surface 51a protrudes from the sheet mounting surface to remove the lowermost sheet material from the stacked multi-leaf original. The pickup is picked up and preliminarily conveyed to the sheet conveyance path on the separation roller 16a side.

The auxiliary transport roller shaft 53 has a B
A gear 60b meshing with the gear 60a of the idler gear 60 is formed. The center of the shaft is a roller mounting portion 53a to which the preliminary transport roller 51 is mounted, and the other end is a clutch shaft 52.
And an insertion portion 53b into which the spring clutch 54 is inserted. As shown in FIG. 6B, a flat portion 53c is formed between the roller mounting portion 53a and the insertion portion 53b of the preliminary transport roller shaft 53, and this portion has a substantially “D” shape. The cross-sectional shape is as follows. Further, a notch 53d for engaging one end of the spring clutch 54 is formed in the insertion portion 53b of the preliminary transport roller shaft 53 in the axial direction.

The spring clutch 54 is formed by winding a spring member in a coil shape, has a generally cylindrical outer shape, and has one end inserted into the preliminary transport roller shaft 53 and the inner peripheral side of the cylindrical shape. A bent portion 54a is formed, and a bent portion 54b bent outward is formed on the other end side.

The clutch shaft 52 is formed at one end with a spring clutch mounting portion 52a into which a bent portion 54b of the spring clutch 54 is formed and inserted at one end, and at the other end, a gear of the A idler gear 59 in FIG. A gear 59b meshed with 59a is formed.

Then, the preliminary transport roller 51 is attached to the roller mounting portion 53a of the preliminary transport roller shaft 53, and the spring clutch 54 is inserted while the bent portion 54a of the spring clutch 54 is fitted into the notch 53a of the preliminary transport roller shaft 53. Further, by inserting the spring clutch 54 into the spring clutch mounting portion 52a of the clutch shaft 52, the pre-conveyance roller shaft 53 is connected to the clutch shaft 5 via the spring clutch 54.
2 are connected. Here, the mounting position (phase) relationship of each member in the rotation direction is as shown in FIG. 6B, and the bent portion 54a inside the spring clutch 54 enters the cutout portion 53a, so that the spring clutch 54 And the phase in the rotational direction of the preliminary transport roller 51 is matched.

When the clutch shaft 52 is rotated in a direction indicated by an arrow d in FIG. 6A, the coil-like spring member is tightened, and the preliminary transport roller shaft 53 and the preliminary transport roller 51 move in the original transport direction. Rotate in the opposite direction,
When rotated in the direction, the coil-shaped spring member is loosened to prevent the rotation from being transmitted to the preliminary transport roller shaft 53 and the preliminary transport roller 51. That is, the spring clutch 54 transmits the rotation of the clutch shaft 52 only in the direction of the arrow d to the preliminary transport roller shaft 53 and the preliminary transport roller 51.

Further, the bending-raising portion 5 of the spring clutch 54
4b, as shown in FIG. 11, abuts on a pendulum 80 rotatably attached to the lower document frame 50.

Next, the structure of the separation roller unit 302 on the lower original frame 50 will be described with reference to FIGS.

The metal separation roller shaft 58 of the separation roller unit 302 has a mold portion 58a mounted by press-fitting, and rotates integrally with the mold portion 58a. A gear 57 meshed with the separation roller 16a and the B idler gear 60 is attached to the separation roller shaft 58 from one end, and a spring member is wound in a coil shape from the other end, and the entirety is substantially formed. A spring clutch 56 having a cylindrical outer shape and a gear 55 meshing with the gear 73 described above are attached.

When the separation roller 16a is fitted into the mold portion 58a of the separation roller shaft 58, the separation roller 16a rotates integrally with the separation roller shaft 58 and relatively slides and rotates with an appropriate frictional force against the mold portion 58a. It is supposed to. The gear 57 includes a separation roller shaft 58
By being fitted into the gear mounting portion 58b having a D-shaped cross section, it rotates integrally with the separation roller shaft 58.

The spring clutch 56 has one end inserted into the gear 55 and the other end inserted into the mold portion 58a, so that the transmission shaft 72 shown in FIG.
3 is transmitted to the gear 55 via the
Has a function of transmitting only the rotation in the document conveying direction to the separation roller shaft 58. That is, the spring clutch 56
When the gear 55 rotates in the direction of the arrow 55b in FIG. 7A, the coiled spring member tightens to transmit the rotation of the gear 55 to the separation roller shaft 58, and the gear integrated with the separation roller shaft 58. The B idler gear 60 meshing with the gear 57 and the gear 57 is driven to rotate, and the winding direction is such that the separation roller 16a rotates in the conveying direction of the document 13.

On the other hand, the gear 55 is connected to an arrow 55a shown in FIG.
, The spring clutch 56 is loosened, the rotation of the gear 55 is not transmitted to the separation roller shaft 58, and none of the separation roller 16a, the gear 57 and the B idler gear 60 is driven to rotate. .

Further, even when the gear 55 rotates in the direction of the arrow 55b, if the separation roller 16a is rotated at a speed higher than the rotation speed in the conveying direction of the original 13, the spring clutch 56 Gear 57 and B
The idler gear 60 is not driven to rotate.

The operation of the transmission shaft 72 of the separation roller unit 302, the mechanical timer 99, and the gear 73 will be described below with reference to FIGS. As described above, the mechanical timer 99 is fixed to the transmission shaft 72, and the gear 73 connected to the mechanical timer 99 is rotatably supported coaxially with the transmission shaft 72.

Here, when the transmission shaft 72 rotates in the direction of the arrow P from the state shown in FIG. 7B, this rotation is not immediately transmitted to the gear 73 by the operation of the mechanical timer 99, but is transmitted to the transmission shaft 72. When the mechanical timer 72 and the mechanical timer 99 are in the state shown in FIG. 7C, the signals are transmitted to the gear 73 with a time delay. This operation is the same even when the transmission shaft 72 rotates in the direction of arrow q opposite to the direction of arrow P from the state shown in FIG. 7C, and in the state of FIG. 7C, the transmission shaft in the direction of arrow q. The rotation of 72 is not immediately transmitted to the gear 73 by the operation of the mechanical timer 99, but is transmitted to the gear 73 with a time delay when the state shown in FIG.

FIG. 8 is a view as seen from the direction of arrow F in FIG. 4, and shows a drive gear for driving the discharge roller 18a, the transport roller 17a, and the transmission shaft 72. 8, the gear 74 is connected to the shaft of the discharge roller 18a via a one-way clutch (not shown). When the gear 74 rotates in the direction of the arrow 74a that is the document discharge direction, the rotation is applied to the discharge roller 18a. The rotation is not transmitted when it is rotated in the direction of the opposite arrow 74b.

The gear 75 has a D-shaped center hole, and is integrated with the shaft of the transport roller 17a.
The gear 76 is a gear that is rotated by the gear 75 in a direction opposite to the rotation of the gear 75. This gear 76 has a central hole D
It is integral with the transmission shaft 72 of FIG. M is a rotary drive motor, which drives the gears 74 and 75 to rotate in the same direction by a drive gear (not shown).

When the drive motor M drives the gears 74 and 75 to rotate in the direction of the arrow 74a, the discharge roller 18a and the transport roller 17a rotate in the document discharge (transport) direction. When the gear 74 and the gear 75 are driven in the direction of the arrow 74b, the transport roller 17a rotates in the direction opposite to the document transport direction, but the drive is not transmitted to the discharge roller 18a by the one-way clutch connected to the gear 74. Therefore, the discharge roller 18a rotates only in the document discharge direction.

The driving motor M is driven by a gear 74 and a gear 75.
Is rotated in the direction of arrow 74a or 74b,
The gear 76 rotates in the direction opposite to the gear 75, and the transmission shaft 72 in FIG. 4 is driven to rotate. When the transmission shaft 72 rotates, the gear 73 starts rotating with a time delay via the mechanical timer 99 as described with reference to FIGS.

The driving motor M is driven by the gear 74 and the gear 75.
Is rotated in the direction of arrow 74a, the separation roller 1
The feed speed of 6a is set to be lower than the feed speed of the transport roller 17a.

Next, the operation of the document feeder when a double leaf document is actually fed will be described with reference to FIG. FIG. 9A shows a state after the start of document conveyance.
(B) shows an initial state before the start of conveyance, respectively. When the user inserts the multi-leaf original in the direction of arrow G in FIG. 9B, the DS actuator 69 is turned on at a point where the leading end of the original exceeds the rotation center position of the preliminary transport roller 51, and the bi-leaf original is further turned on. When the document is inserted deeply, the leading end of the document abuts against the stopper member 68.

Thereafter, when a copy or transmission instruction is given on the operation panel of the operation section D, the drive motor M rotates to rotate the gear 74 and the gear 75 in the direction of 74a, so that the discharge roller 18a and the transport roller 1
7a rotates in the sheet conveyance direction, and with a time delay by the mechanical timer 99, the separation roller 16a and the preliminary conveyance roller 51 rotate in the sheet conveyance direction.

At this time, as shown in FIG. 9A, when the conveying roller 17a rotates in the direction of the arrow H, which is the sheet conveying direction, the stopper roller 67 presses against the roller.
Rotate in the direction of arrow J, which is the opposite direction. At this time, the engaging portion 67a of the stopper roller 67 engages with the engaging arm portion 68a of the stopper member 68 to rotate the stopper member 68, so that the stopper member 68 is flipped up and the document is moved on the document conveying path. Can be passed.

Next, with a time delay by the mechanical timer 99, the separation roller 16a and the preliminary transport roller 51 start rotating in the direction of arrow H which is the sheet transport direction. As a result, the document sandwiched between the preliminary transport roller 51 and the preliminary transport pressing plate 77 constituting the preliminary transport section is separated from the separation roller 16a constituting the document separation section by the separation sheet while being separated by the preliminary transport section. 16b, where they are separated one by one and sent to a transport roller 17a.

At this time, as described above, the separation roller 1
6A, the rotation speed of the separation roller 16a exceeds the rotation speed of the gear 55 when the leading end of the document is sent to the conveyance roller 17a. The clutch 56 is loosened, and the gear 57 and the B idler gear 60 are not driven to rotate, and the rotation of the preliminary transport roller 51 stops.

However, in practice, since a slight idling torque or the like is generated, the rotational force is transmitted to the gear 57 and the B idler gear 60, and the preliminary transport roller 51 tries to rotate. At this time, a stop spring 7 as a plate-like elastic member shown in FIG.
As shown in FIG. 10, when 9 comes into contact with the flat portion 53 c of the preliminary transport roller shaft 53, it becomes a resistance in the rotation direction.
The preliminary transport roller 51 stops when its standby surface 51b is oriented in the direction of arrow K in FIGS. 10 and 11, and the preliminary transport roller 51 does not protrude from the sheet placement surface of the document tray 15.

As described above, when a document is being conveyed by the conveyance roller 17a and the separation roller 16a,
Always stop with the standby surface 51b of the preliminary transport roller 51 facing in the direction of the arrow K, and the gap between the preliminary transport roller 51 and the preliminary transport pressing plate 77 is opened, and the document is not pulled backward. The document can be smoothly conveyed without obstruction such as elongation.

Thereafter, the leading end of the original is conveyed by the transport roller 17a.
DES actuator 70 is turned on at a point beyond
Then, the image information is read by the photoelectric conversion element 19 and is discharged onto the recording cover 12 by the discharge roller 18a.

When the rear end of the document passes through the separation roller 16a and the document is conveyed only by the conveyance roller 17a, the rotation speed of the separation roller 16a becomes the same as the rotation speed of the gear 55. As a result, the spring clutch 56 is tightened, the gear 57 and the B idler gear 60 are driven to rotate, and the preliminary conveyance roller 51 is rotated again, so that the conveyance operation of the next document is started.

FIG. 12 shows an operation sequence of the stopper member 68 and the preliminary transport roller 51 when the drive motor M is rotated in the document transport direction. Among the operations of the preliminary transport roller 51 in FIG. 12, the operation indicated by the solid line is the operation according to the embodiment. In this operation, the original is transported by the preliminary transport roller 51 after the stopper member 68 is opened as shown in FIG. Among the operations of the preliminary transport roller 51, the operation indicated by the two-dot broken line is a reference operation when the mechanical timer 99 is not provided.

If the DS actuator 69 has not detected the original and the DES actuator 70 has detected the original, and the control system determines that all originals have been read after a fixed original feed has been completed, An initialization operation for setting the rotation stop position of the preliminary transport roller 51 to an initial position is performed.

This initialization operation is performed by the drive motor M
Is reversed. When the drive motor M is rotated in the reverse direction, the transmission shaft 72 and the gear 73 rotate via the gears 75 and 76 in FIG. 8, and the gear 55 meshing with the gear 73 rotates in the direction opposite to the document conveying direction. At this time, the spring clutch 56 is loosened, and the gear 57 and the B idler gear 60
Is not driven to rotate and the stop of the rotation of the preliminary transport roller 51 is maintained, the A idler gear 59 meshing with the gear 55 rotates, the spring clutch 54 is tightened, and the rotation of the gear 59b rotates the preliminary transport roller shaft. 53, the spring clutch 54 and the preliminary transport roller 51
Rotates in the direction of arrow L in FIG.

When the pre-conveyance roller 51 rotates in the direction of arrow L, the bent and raised portion 54b of the spring clutch 54 abuts on the pendulum 80 as shown in FIG. Since it abuts on the rib 50a, the rotation of the pendulum 80 is prevented. At this time, since the spring clutch 54 is loosened, the drive from the clutch shaft 52 to the preliminary conveyance roller shaft 53 is cut off.
The preliminary transport roller 51 stops. At this time, as shown in FIG. 6B, the bending relationship between the bent portion 54b of the spring clutch 54 and each surface of the preliminary transport roller 51 is constant, so that the standby surface 51b of the preliminary transport roller 51 always has an arrow. Face K direction.

At this time, as shown in FIG.
Flat portion 53c of preliminary transport roller shaft 53 and stopper spring 7
9 is kept in contact with the auxiliary transport roller shaft 53, so that the phase between the bent portion 54b of the spring clutch and the standby surface 51b of the auxiliary transport roller 51 is slightly shifted due to manufacturing accuracy. The standby surface 51b of the preliminary transport roller 51 can be stopped in the direction of arrow K.
This ensures that the next time a document is inserted, the preliminary transport roller 51 and the preliminary transport pressing plate 77 are in an open state.
The stopper member 68 can be smoothly moved without the original being caught.
Can reach the end of.

Further, when the drive motor M is rotated in the reverse direction by the initialization operation, the gear 75 shown in FIG. 8 is rotated, and the conveying roller 17a is opposite to the original conveying direction in FIG.
(B) rotates in the direction of arrow N,
The stopper roller 67 which is in pressure contact with 7a rotates in the direction of arrow P. At this time, when the engaging portion 67a of the stopper roller 67 is engaged with the engaging arm portion 68a of the stopper member 68 to rotate the stopper member 68, the stopper member 68 is lowered to a predetermined position, and the document feeding path is closed. State.
The stopper member 68 abuts on a not-shown abutting portion of the lower document frame 50 when the document conveying path is closed, and is prevented from rotating.

At this time, since the rotation of the stopper roller 67 in the direction of the arrow P is stopped and the stopper roller 67 stops, the transport roller 17a and the stopper roller 67 enter a slip state.

By performing such an initializing operation, the stopper member 68 moves down to close the document conveying path, so that when the document is inserted from this state, the document hits the stopper member 68. It will not be forced into the separation section.

According to the facsimile apparatus provided with the original conveying device, the preliminary conveying roller 51, the separation roller 16a,
Since the rotation control of the transport roller 17a and the discharge roller 18a and the movement control of the stopper member 68 are realized only by the rotation drive of the drive motor M without using a solenoid, cost reduction, downsizing, and ease of assembly are achieved. It has become possible to contribute to the improvement of

[0098]

As described above in detail, according to the present invention, the preliminary conveying means for preliminarily conveying the sheet material on the sheet conveying path, and the preliminary conveying means are disposed at the subsequent stage of the preliminary conveying means and are preliminarily conveyed by the preliminary conveying means. A separating and conveying means for separating and conveying the sheet material, and a separating and conveying means disposed at a subsequent stage of the preliminary conveying means so as to be rotatable in the opening and closing direction of the sheet conveying path, and rotating the sheet material in the closing direction of the sheet conveying path. A stopper member that stops at the preceding stage, a driving unit that supplies a driving force to the separation and conveyance unit, and a drive transmission unit that transmits the driving force of the driving unit supplied to the separation and conveyance unit to the stopper member and the preliminary conveyance unit. The drive transmission unit includes a delay transmission mechanism that transmits the driving force of the drive unit to the stopper member and then transmits the drive force to the preliminary conveyance unit, so that the movement of the stopper member can be performed without using a solenoid. And ability, it is possible to provide to provide a compact sheet conveying device at a low cost, and an image reading apparatus having the sheet conveying device.

[Brief description of the drawings]

FIG. 1 is a central sectional view of a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is an external perspective view of the facsimile machine.

FIG. 3 is an electric signal control block diagram of the facsimile apparatus.

FIG. 4 is a plan view of a lower document frame unit in a document reading system of the facsimile apparatus.

FIG. 5 is a plan view of an upper document frame unit in the document reading system.

FIGS. 6A and 6B are diagrams illustrating a configuration of a preliminary transport roller unit in the lower document frame unit, wherein FIG. 6A is an exploded view and FIG. 6B is a diagram illustrating a phase relationship between members;

7A and 7B are configuration diagrams of a separation roller unit in a lower document frame unit, where FIG. 7A is an exploded view and FIG.
(D) is sectional drawing explaining operation | movement of a mechanical timer.

FIG. 8 is a diagram showing each drive gear as viewed from the direction of arrow F in FIG. 4;

FIGS. 9A and 9B are diagrams for explaining the movement of a stopper member in the document feeder, wherein FIG.
(B) shows the state at the time of the initialization operation.

FIG. 10 is a diagram illustrating a configuration of a stop spring and a phase relationship of a preliminary transport roller and the like in an initial state.

11A and 11B are diagrams illustrating movements of a preliminary conveyance roller, a spring clutch, and the like. FIG. 11A illustrates a state at the time of an initialization operation, and FIGS.

FIG. 12 is an operation sequence diagram of a stopper and a preliminary conveyance roller.

FIG. 13 is a central sectional view of a reading unit of a conventional facsimile machine.

FIG. 14 is a plan view of a reading unit of a conventional facsimile machine.

FIG. 15 is an explanatory view of a stopper movement of the conventional facsimile machine.

FIG. 16 is an external view of a conventional facsimile machine.

[Explanation of symbols]

 A Paper feed system B Recording system C Document reading system D Operation unit 1 (1a, 1b) Paper feed cassette 2 (2a, 2b) Recording sheet 3 (3a, 3b) Feed roller 1 Ink cartridge 11a, 11b Discharge roller 13 Document 15 Document Tray 16a Separation Roller 16b Separation Piece 16c Separation Spring 17a Conveyance Roller 17b Conveyance Roller 18a Discharge Roller Pair 18b Discharge Roller 19 Photoelectric Conversion Element 301 Preliminary Conveyance Roller Unit 50 Lower Document Frame 51 Preliminary Conveyance Roller 51a Preliminary Conveyance Surface 51b Standby Surface 52 Clutch shaft 53 Preliminary conveyance roller shaft 53a Notch portion 53c Flat portion 54 Spring clutch 54a Bending portion 54b Bending portion 55 Gear 56 Spring clutch 302 Separation roller unit 59 A idler gear 60 B idler gear 61 Upper document frame 67 Stopper B 67a engaging portion 68 stopper member 72 transmission shaft 73, 74, 75 and 76 gears 79 stop spring 80 pendulum 99 Mekataima (delay transmission mechanism)

Continued on the front page F-term (reference) 2H076 BA07 BA17 BA24 BA33 3F343 FA03 FB03 FC01 GA01 GB02 GC01 GD01 HA12 HB01 JA06 JA19 JD03 JD09 JD33 KA06 KA13 KA17 LA04 LA16 LC09 LC19 LC25 LD24 MB04 MB13 MB14 MB15 MB16 MC08 MC09 MC21 A AB31 AB32 AC11 AD02 AD06 BA01

Claims (9)

[Claims] A pre-conveying means for pre-conveying the sheet material stacked on the sheet mounting surface to a sheet conveying path; and a sheet material pre-conveyed by the pre-conveying means which is disposed at a subsequent stage of the pre-conveying means. A separating / conveying means for separating and conveying the sheet material; a separating / conveying means disposed behind the preliminary conveying means so as to be rotatable in an opening / closing direction with respect to the sheet conveying path; A stopper member that stops at a stage preceding the unit, a driving unit that supplies a driving force to the separation and conveyance unit, and a driving force of the driving unit that is supplied to the separation and conveyance unit is transmitted to the stopper member and the preliminary conveyance unit. And a delay transmission mechanism that transmits the driving force of the driving unit to the stopper member and then transmits the driving force to the preliminary conveyance unit. Sheet conveying apparatus characterized by. 2. The pre-transporting means includes a preliminary transport surface protruding from the sheet mounting surface and a standby surface not protruding from the sheet mounting surface. 2. The sheet conveying apparatus according to claim 1, further comprising a preliminary conveying roller that changes its protruding state with respect to the surface. 3. An initial position holding mechanism for holding the preliminary conveyance roller at a rotational position that does not protrude from the sheet mounting surface in an initial state of starting conveyance of the sheet material. A sheet material conveying device as described in the above. 4. The initial position holding mechanism presses a flat portion having a substantially D-shaped cross section provided on a shaft portion of the preliminary conveyance roller and a shaft portion of the preliminary conveyance roller to start conveyance of a sheet material. 4. The sheet conveying apparatus according to claim 3, further comprising: a plate-shaped elastic member that elastically abuts on the flat portion at an initial position and imparts a resistance to a rotation direction to the preliminary conveying roller. 5. The separation / conveyance means includes at least a conveyance roller rotationally driven by the driving means, a driven roller which is in pressure contact with the conveyance roller and is driven in a reverse direction based on the rotation of the conveyance roller, and A separation roller that is located at a stage preceding the roller and that rotates in the sheet material conveyance direction based on the rotation of the conveyance roller, wherein the drive transmission unit rotates the preliminary conveyance roller based on the rotation of the separation roller. The sheet material according to any one of claims 2 to 4, wherein a driving force is transmitted, and the driven roller includes an engagement portion that rotates the stopper member by engaging with the stopper member. Transport device. 6. The drive unit is a rotary motor, and the drive transmission unit is provided with a transmission shaft for transmitting the rotational driving force of the rotary motor transmitted to the transport roller to the separation roller, The transmission shaft is provided with the delay transmission mechanism that transmits the rotational driving force of the rotary motor so as to delay the rotation start of the separation roller based on the start of rotation of the transport roller at a predetermined timing. The sheet conveying apparatus according to claim 5, wherein 7. The sheet according to claim 6, wherein an initialization mechanism is provided for returning the preliminary conveyance roller to a position in an initial state of the start of conveyance of the sheet material by driving the rotary motor to rotate in the reverse direction. Material transfer device. 8. A sheet conveying device according to claim 1, further comprising: an image reading unit disposed downstream of the separating and conveying unit to input image information of an image surface of the sheet. An image reading apparatus, comprising: a sheet material discharging unit that is disposed at a subsequent stage of the image reading unit and discharges the sheet material. 9. The image reading apparatus according to claim 8, wherein the sheet material discharging unit is driven by the driving unit.