JPH0494333A - Automatic paper feeding device - Google Patents

Abstract

PURPOSE:To carry out accurate positioning of each gear by supporting a gear train for transmitting the driving power of a carrier roller to a feeding roller, through one bearing plate installed on a device main body. CONSTITUTION:A bearing plate 130 is butted to three butting parts 133-135 formed on a case main body 129 of a paper feeder driving part 40, and its position is regulated in the axis direction, horizontally and vertically through two positioning parts 136, 137, and is patched and thus stopped by three fixed claws 138-140. Regarding the rotation of a carrier roller that works also as a platen roller of a recording device, a slid contact roller 42 and a feeding roller 41 are rotated at high speed in a gear train composed of gears 48, 94, 95, 96 that are engaged with the carrier roller and the platen roller. The shafts of the gear trains 93-96 are supported by the bearing plate 130. The accurate positioning of each gear train is automatically carried out, and loose-end stopping can thus be ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention provides a method for sorting stacked records (cut sorting).
The present invention relates to an automatic paper feeding device for separating sheets one by one and feeding them to a processing section such as a recording section.

[Prior Art] Recording devices such as printers, copiers, and facsimiles record notes (to be recorded) such as paper, plastic, or thin plates by driving an energy generating body in a recording pen according to recorded information. It is configured to record images on the material.

The above recording device is an inkjet type,
It can be divided into wire dot type, thermal type, laser beam type, etc.

In addition to plain paper, the recording sheets used in the recording apparatus include thick paper such as postcards and envelopes, and special sheets such as plus-thin sheets.

Recording sheets can be fed manually or automatically by an automatic paper feeder.

The automatic paper feeding device generally includes a paper feeding drive section that rotates a feeding roller to feed out the recording sheet, and a paper feeding force center section into which the recording sheet is loaded. ) is used to drive the feeding roller, so that recording sorting is performed by separating and feeding sheets one by one.

In addition, automatic paper feeding devices include a built-in type that is built into a recording device, and an external type that is detachably attached.

This type of automatic paper feeding device is provided with a gear train for transmitting the driving force of the conveying roller of the recording device to the feeding roller.
Each gear constituting the gear train is pivotally supported by the main body of the device.

Further, in the automatic paper feeder, in addition to the gear train,
The feeding roller, various levers, clutch mechanisms, springs, sliding rollers for guiding recording sheets, etc. are also positioned and mounted on the main body of the apparatus.

[Technical Problem to be Solved by the Invention] However, in the conventional automatic paper feeder, each gear of the gear train is individually pivotally supported on the main body of the device, and is prevented from coming off with a retaining ring or the like. The structure was complex, requiring a large number of man-hours to assemble, and there were technical problems in that it was difficult to achieve positional accuracy and parallelism between the gears.

The present invention has been made in view of these technical issues, and it is possible to provide a gear train for transmitting the driving force of the conveyance roller of the recording device to the feeding roller with fewer parts in the main body of the recording device. To provide an automatic paper feeding device which has a simple structure and can be easily mounted with high precision in a positioning and preventing state.

[Means for Solving the Problems] The present invention provides an automatic paper feeding device that is detachably attached to a recording device and includes a gear train for transmitting the driving force of a conveyance roller of the recording device to a feeding roller. By configuring the positioning and locking of each gear in the gear train using a single bearing plate attached to the main body of the device, the structure is simple with a small number of parts, and can be easily and accurately carried out.
The present invention provides an automatic paper feeding device in which a gear train for transmitting driving force to a feeding roller can be mounted to the main body of the device in a positioning and preventive manner.

〔Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

Note that the same reference numerals in each drawing indicate the same (or corresponding) parts.

FIG. 4 shows a state in use of a horizontal type recording device (recording device main body) 10 suitable for carrying out the present invention and also suitable for mounting an automatic paper feeder according to the present invention. FIG. 5 is a perspective view showing a schematic internal configuration of the recording apparatus shown in FIG. 4. FIG.

4 and 5, a recording sheet insertion slot 1 is provided on the top surface of a recording unit W (for example, an ink-end recording device that performs recording by ejecting ink using thermal energy).
1 and a recording sheet ejection port 12 are formed, and an insertion port 11 and a recording sheet ejection port 12 are formed.
The recording sheet 13 inserted from above is brought into close contact with the circumferential surface of a platen roller 14 which also serves as a conveyance roller (feed roller).
The recording sheet is conveyed along a substantially U-shaped recording sheet conveyance path, is recorded while passing through a recording section facing the recording head 15, and is discharged upward from the discharge port 12 after recording.

Here, the paper feed tray 16 is pivotally attached to the top surface of the recording device 10 so that it can be opened and closed, and when in use (recording), it opens and functions as a paper feed tray, but when not in use (when storing, etc.). ) is set in the closed position as shown in FIG. It functions as a protective cover 16.

In FIG. 5, the recording head 15 is mounted on a carriage 22 that reciprocates along a guide shaft 21.21 parallel to a conveyance roller (platen roller) 14.

Note that the recording head 15 disclosed herein is an inkjet recording head, and is configured integrally with an ink tank.

The inkjet recording head 15 is a recording head that discharges ink using thermal energy, and is equipped with an electrothermal converter for generating thermal energy.

Further, the recording head 15 ejects ink from the ejection port by utilizing pressure changes caused by growth and contraction of bubbles due to film boiling caused by thermal energy applied by the electrothermal converter, This is for recording.

A recording sheet 13 is placed on the upstream side of the recording head 15 in the conveyance direction.
A press plate 23 is arranged to press the paper against the conveyance roller 14.

This presser 23 is pressed against the circumferential surface of the conveyance roller (platen roller) 14 by a leaf spring 24 .

Further, the pressing force of the pressing plate 23 is the same as that of the platen roller 1.
The lever 25 can be released by operating the lever 25 which is supported by the shaft 4.

Further, a spur 26 and a roller 27 are provided at the discharge port 12 to assist in discharging the recording sheet 13.

FIG. 6 is a diagram showing the bottom surface of the recording apparatus (main body) 10 (in the upright position, which will be described later, this becomes the back surface on which an automatic paper feeder is attached).

A second recording sheet insertion opening 28 is formed at the bottom of the recording device 10, and a substantially straight line extends from this insertion opening 28 through the recording section between the recording head 15 and the platen roller 14 to the recording sheet discharge opening 12. The second recording sheet transport path is configured to extend in the downward direction of the road (substantially horizontal in the upright state in FIG. 1).

As will be described later, this second recording sheet conveyance path can be used when the recording apparatus 10 is upright (FIGS. 1 and 2), and since it is not curved, it can be used for carrying postcards, envelopes, etc. This has the advantage that even stiff recording sheets such as thick sheets or special sheets such as plastic sheets can be easily fed.

The above-mentioned recording device 10 can be used in an upright position, and in the upright position, an automatic paper feeder can be detachably attached, and automatic paper feed and Manual paper feeding is possible.

1 to 3 are longitudinal cross-sectional views of the automatic paper feeder 30 attached to the back of the recording apparatus 10 in an upright position. FIG. 2 shows a state in which manual paper feeding is performed, and FIG. 3 shows a stored state.

1 to 3, when the recording apparatus 10 is placed in an upright position, the recording section (recording head 15 and platen roller 14)
(between the
2 is formed.

Therefore, the automatic paper feeder 30 has an entrance (sheet insertion slot) 2.
8, the recording sheet 13 is positioned so as to be fed into this linear conveyance path, and
It is removably attached to the opening surface of 8).

Further, the automatic paper feeder 304 is provided with a paper bus surface 31 for guiding recording sheets that can be continuous with the substantially linear recording sheet feeding path a.

In addition, in front of the paper path surface 310 (on the left side in FIGS. 1 to 3), there is a manual paper feed tray 43 used for manual paper feeding.
is attached so that it can be opened and closed about a shaft 44.

The manual feed tray 43 is folded downward and stored during automatic paper feeding (FIG. 1) and storage (FIG. 3), and protrudes to a horizontal position during manual paper feeding (FIG. 2). made to do,
It forms a recording sheet guide surface that can be connected to the paper bus surface 31.

The automatic paper feeder 30 includes a paper feed drive section 40 fixedly coupled to the recording device 10, and a substantially vertical position W (closed position) and an inclined position (open position) with respect to the paper feed drive section 40. The paper feed cassette section 50 is rotatably mounted between the paper feed cassette section 50.

FIG. 7 is a perspective view of the automatic sheet feeding device 30 during automatic sheet feeding shown in FIG. 1, viewed from the surface connected to the recording apparatus IO.

The paper feed cassette section 50 is a section into which the recording sheet 13 is loaded, and the paper feed drive section 40 is a section where the recording sheet 13 is loaded.
This is the part that sends out the sheets one by one and feeds them to the recording device IO.

In FIGS. 1 to 3 and in the seventh session, the paper feeding force center section 50 is pivotably mounted at a position facing the upper half of the paper feeding drive section 40 so as to be able to rotate (open and close) about a fulcrum 51. has been done.

The position of the paper feed drive unit 40 facing the paper feed cassette unit 50 (
A feeding roller 41 and a sliding roller 42 are attached to the upper half.

The feeding rollers 41 are provided in plural on the same axis, apply feeding force to the loaded recording sheets 13, and separate the recording sheets 13 one by one in cooperation with separating claws 75 and 76, which will be described later. It has a function of sending the data into the recording device 10.

This feeding roller 41 is the conveying roller 14 of the recording device 10.
It is driven using the driving force of

A plurality of the sliding rollers 42 are provided on an axis parallel to the axis of the feeding roller 41, and have a function of guiding the recording sheet 13 sent out by the cough feeding roller 41 to the recording device 10. There is.

This sliding roller 42 is a conveyor roller 14 of the recording device 10.
are driven in conjunction using the driving force of

A foldable paper feed tray 52 is provided in the paper feed tray section 50.
When in use, it can be pulled out to form a tray as shown in FIG. 1, and when stored, it can be folded into the cassette section 50 as shown in the third section.

The lower part 45 of the case body of the paper feed drive unit 40 is connected to the recording device 1.
0 and forms the bottom surface when the automatic paper feeder 30 is installed, and together with the rear surface of the recording device 10 (the bottom surface in FIG. 1), serves as a support surface for stably standing the entire device.

Recording device 1 with automatic paper feeder 30 attached in an upright position
0 is the cover (paper output tray) as shown in FIG.
16, and further, by placing the paper feed cassette section 50 in a vertical state and closing the paper feed tray 52,
It is put into storage.

In this stored state, the outer shape is a substantially rectangular parallelepiped with a flat bottom surface, and it is gathered up in a compact upright position with no overhanging parts.

After loading the recording sheet 13 into the paper feed pinion 21 section 50 and making it ready for recording, when recording by automatic paper feeding, the first
As shown in Figure B, the paper feeding force center section 50 is opened (tilted) to start the recording operation.

On the other hand, when recording by manual paper feed, as shown in FIG. 2, the paper feed cassette section 50 remains in the vertical (closed) state and the manual paper feed table 43 is raised to form an auxiliary guide surface. , the recording sheet 13 is transferred from the nuclide feeder to the paper path surface 3.
1 into the recording device.

In the illustrated example, a gap is formed between the sliding contact roller 42 and the paper path surface 3, through which the recording sheet 13 passes during automatic paper feeding and manual paper feeding.

An outlet 49 for the recording sheet 13 is formed on the joint surface (mounting surface) of the automatic paper feeder 30.

On the other hand, on the side of the exit (discharge port) 12 of the recording sheet conveyance path of the recording apparatus 10, a paper discharge tray configured by opening the cover 16 is provided.

As shown in the figure, the paper ejection tray 16 is installed at a position lower than the recording sheet ejection port 12 by a predetermined height h, and extends substantially horizontally.

Next, a coupling structure between the recording device 10 and the automatic paper feeder 30 will be described.

FIG. 8 is a horizontal sectional view showing the combined state of the recording device 10 and the automatic paper feeder 30, and the ninth time shows the state in which the lock is released from the state shown in FIG.

First, a conveyance roller (
A drive gear 33 that rotates in synchronization with the platen roller (platen roller) 14 is pivotally supported, and a driven gear that meshes with the drive gear 33 is mounted on the mounting surface of the automatic paper feeder 30, as shown in FIGS. 7 to 9. A gear (transfer gear) 48 is pivotally supported, and the recording device W1 is connected via these gears 33 and 48.
The driving force of the conveyance roller 14 of 0 is transmitted to the automatic paper feeder side.

The conveyance roller 14, the conveyance motor 34, etc. are supported by a bearing portion formed on the frame member 35, and the frame member 35 is coupled to a case portion of the recording apparatus IO.

A hook member 38 having a lever 36 and a tip flange 37 is attached to two positions on the left and right sides of the automatic paper feeder 30 in a substantially symmetrical relationship so as to be swingable and movable by a predetermined amount in the front and rear directions. Each hook member 38 is biased inwardly by a tension spring 39.

The hook 37 of each hook member 3B protrudes by a predetermined amount from the mounting surface of the automatic paper feeder 30.

On the other hand, each hook 3 of the frame member 35 of the recording device 10
7 is formed with an opening 53 through which each hook 37 enters, and each hook 37 is inserted into the corresponding opening 5.
It can be hung on the peripheral edge of 3.

As shown in FIGS. 8 and 9, the peripheral edge of each opening 53 is formed with a bead-shaped portion on which the hook 37 can be easily and reliably hooked.

In the state in which the flap 37 in FIG. 8 is hooked, the tension spring 39
is extended (for example, by one or two decorations), and the automatic sheet feeding device 30 is drawn toward the recording device 10 by the spring force, and is brought into pressure contact with the recording device 10.

By pinching and rotating the lever 36 of each hook member 38, the locked state shown in FIG. 8 is released from the released state shown in FIG.
It can be removed from.

At right and left positions above the left and right hook members 38 by a predetermined distance, retaining parts are provided for abutting the automatic paper feeder 30 against the recording part 210 in a positioned state.

The 10th is a horizontal cross-sectional view of this engaging part, and the 11th
10 is a partial sectional view taken along line XI-XI in FIG.

In FIGS. 7, 10, and 11, the engaging portion on the side closer to the driven gear 48 (the right side in FIG. and,
A recess 55 formed in the frame member 35 of the recording apparatus 10 is configured, and by abutting and fitting the protrusion 54 and the recess 55, the automatic paper feeder 3 is connected to the recording apparatus 10.
0 spacing and vertical positioning.

That is, at the engagement portion between the protrusion 54 and the recess 55, a slight play is provided only in the left-right direction.

On the other hand, the side opposite to the driven gear 48 (left side in Figure 1O)
The engaging portion is a protrusion 56 formed on the automatic paper feeder 30 side.
and a recessed hole 51 formed in the frame member 35 of the recording device 10, and by fitting these protrusions 56 and recessed holes 57 against each other, the distance and vertical position of the automatic paper feeder 30 relative to the recording device 10 can be adjusted. Positioning is performed in the left and right direction.

In the illustrated example, the left and right retaining portions for abutting and positioning are connected to the left and right hook members 38 (the eighth
1 and 9), but they may also be arranged below depending on the case.

With the above configuration, the automatic paper feeder 3 has a recording sorting conveyance path formed in a substantially straight line through the recording section in an upright state, and can be driven by the driving force of the conveying means 14.
In the recording apparatus 10 to which the automatic paper feeder 30 is attached, the spring-biased movable hooks 37 attached to two places on the left and right sides of the attachment surface of the automatic paper feeder 30 are attached to the frame member 35 of the recording apparatus main body.
The hooks provided on the left and right sides of the can be secured to the part,
Fitting portions 54, 55, 56 for positioning and abutment at two left and right locations above (or below) the movable hook 37
．． 57 is provided.

According to the recording device having such a configuration, when the automatic paper feeder 30 is attached to the recording device 16, the distance between the shafts of the gears 33 and 48 for transmitting driving force can be determined accurately, and vibrations during use can be determined accurately. It was possible to realize a recording apparatus that can accurately drive the feeding roller 41 without causing any fluctuation in the distance between the axes even due to external forces or external forces, and can provide stable sheet feeding operation.

Furthermore, in the illustrated example, as shown in FIG.
is formed.

These protrusions 58 and 59 are formed so as to face the mounting surface of the recording device 10 with a slight gap (for example, about 0.3 mm) when assembled, and are attached to the attached automatic paper feeder 30. It has a function to prevent rattling from occurring.

FIG. 12 is a longitudinal sectional view of the automatic paper feeding device 30 in an automatic paper feeding state, and Figure 13 is a longitudinal sectional view of the automatic paper feeding device 30 in a manual paper feeding state (or a state in which recording sheets can be loaded). .

In FIGS. 12 and 13, the paper feed cassette 7 section 5
A pressure plate 68 that is spring-biased toward the feeding roller 41 by a pressure plate spring 67 is attached to the roller 0 .

Further, a pair of sliders 71 and 72 whose spacing can be adjusted according to the width of the recording sheet 13 are guided and supported in the paper feeding force center section 50 .

FIG. 14 shows the slider 71.7 with the pressure plate 68 removed.
2 is a partially cutaway front view of the paper feeding force center section 50,
FIG. 15 is a partially cutaway front view of the paper feed force center section 50 showing the sliders 71, 72 and the 02 pressure plate 68.

In FIGS. 12 to 15, the left and right sliders 71.7
2 includes side guides 73, 74 that come into contact with both side edges of the loaded recording sheet 13, and separation claws 75, 76 that can be held at both front end corners of the loaded recording sheet 13.
is provided.

The separating claws 75, 76 are formed at the front end of a separating claw member 77, 78 fixed to the main body of the slider 71, 72.

The separating claw members 77, 78 are generally formed of a metal plate such as a steel plate.

In the illustrated example, the sliders 71 and 72 are attached to the case of the paper feeding force center section 50 so that one can be moved left and right in a large range according to the paper width, and the other can be moved left and right in a small range. Depending on the case, either one of them can be mounted so as to be movable according to the width of the paper.

As shown in FIG. 12, the loaded recording sheet 13 is held between the pressure plate 68 and the separating claws 75, 76,
During automatic paper feeding, the D-shaped (or half-moon-shaped) feeding roller 4
1 rotates and comes into contact with the recording sheet 13, and paper feeding force is applied.

While the feeding roller 41 is moving 1@, one sheet of the uppermost layer is separated and fed through the sliding roller 42 to the cue position 1 in the recording apparatus flO.

The sliding roller 42 is disposed parallel to the feeding roller 41 near the paper path surface 31, and is moved slightly (for example, 8%) from the feeding roller I4 of the recording device 10 in conjunction with the feeding roller I4 of the recording device 10. ) Rotationally driven at high circumferential speed.

On the other hand, the feed roller 41 is also driven using the driving force of the conveyance roller 14, but the feed roller is a one-way club that is controlled to turn on and off during normal rotation and is shut off (off) during reverse rotation. Nochi-shaped spring clutch 9th (Fig. 17)
Since it is driven in the normal rotation direction only at a predetermined timing, such as when the recording sheet 13 is located at its beginning.

FIG. 16 shows various types of operations that operate when the paper feed cassette 7) unit 50 is rotated between a vertical closed position and an inclined open position (automatic paper feed position) with respect to the paper feed drive unit 40. FIG. 3 is a mechanical diagram showing a retaining member.

First, in FIGS. 12 and 16, the paper feed drive unit 4
Stoppers 79 and 79 are provided on both sides of the case of No. 0 to abut against the lower part of the paper feed cassette section 50 to hold the cassette section in an inclined position (automatic paper feed position).

Further, the sliders 71 and 72 on both sides are provided with sheet entry prevention means (sheet entry prevention levers) 81 and 81 for preventing the insertion (loading) of the recording sheet 13 at the automatic paper feeding position.
is provided.

This lever 81.81 has a pin 82 attached to the slider 71.72.
．． 82, and in the automatic sheet feeding position shown in FIG.

Therefore, even if an attempt is made to insert a new recording sheet 13, the leading edge of the recording sheet 13 is obstructed by the sheet entry prevention levers 81, 81 and cannot be inserted into the cassette.

On the other hand, when the paper feed cassette section 50 is rotated to the vertical position,
As shown in Fig. 13, the seat entry prevention lever 81.8
The lower end of 1 hits the case end surface S on the paper feed drive unit 40 side,
The lever 81.81 is rotated counterclockwise by a predetermined amount around the pin 82.82, and its upper end is lifted to open the insertion slot 83, so that the recording sheet 13
can be inserted into the cassette.

In addition, in FIGS. 13 and 16, the paper feed drive unit 4
Pressure plate pushing members 84 and 84 protruding toward the cassette section 50 are provided on both sides of the case of No. It hits the formed ears 85.85 (FIG. 15), and the pressure plate 68 is pushed down.

Therefore, as shown in FIG. 13, the distance between the feeding roller 41 and the pressure plate 68 is widened, an insertion space 86 for the recording sheet 13 is formed, and a new recording sheet 13 can be loaded.

In this state, the fixed separating claws 75 and 76 provided on the left and right sliders 71 and 72 remain at fixed positions that are equal to or slightly overlap the feeding roller 41, as shown in FIG. Furthermore, since a guide protrusion 87 having a height slightly protruding from the feed roller 41 is formed on the inlet side of the feed roller 41, the recording sheet 13 to be inserted is separated by the separating claws 75, 76 and the pressure plate 68. It can be reliably loaded between

The paper feed force center section 50 is held in the vertical position (closed position W) by a latch mechanism that is released when a push button 88 (FIGS. 13 and 16) is pushed, and the paper feeding force center section 50 is held in the vertical position (closed position W) by pushing the push button 88 (FIGS. 13 and 16). When the locking mechanism is released, the biasing spring 6 of the pressure plate 68
It is designed to be automatically rotated to the tilted position (open position) by the reaction force of 7.

As shown in FIG.
It is composed of a hook lever 89 provided on the case body of the paper feed cassette section 50 and a retaining section 91 provided on the case body of the paper feed cassette section 50. is maintained.

In this state, press the push button 88 and press the tip 92.
By elastically deforming the hook lever 89 and separating it from the retaining portion 91 (FIG. 16), the hook is released.

FIG. 17 is a perspective view showing the drive system and arrangement of the feeding roller 41 and the sliding roller 42.

In FIG. 17, the rotation of a driven gear (transfer gear) 48 driven in synchronization with the rotation of the conveyance roller 14 of the recording device 10 is caused by a series of gear trains 93, 94, 95, 46.
．． 96 to the shaft 97 of the feed roller 41.

Note that the gear 95 in the middle is fixed to the shaft 47 of the sliding roller 42.

Further, the gears 93, 94, and 46 are idle gears.

Here, the gear 96 is mounted coaxially with the shaft 97 of the feed roller 41, and the gear 96 and the feed roller shaft 97 are mounted coaxially.
7 is connected via a one-way clutch (for example, a spring clutch) 9.

This one-way clutch 9 is always cut off (off) in the reverse rotation direction, but is configured with a spring clutch that is controlled to be turned on and off in the forward rotation direction as well.

As the one-way clutch 9, for example, one that operates as follows is used.

First, when the conveyance roller (platen roller) 14 slightly reverses (rotates in the direction opposite to the conveyance direction) based on a paper feed signal, the one-way clutch 98 causes the gear 96 to reverse (rotate in the opposite direction).
(flanch trigger).

In this on state, the forward rotation of the conveyance roller 14 causes
The feeding roller 41 is now in a state where it can rotate forward.

At this time, the feeding roller 41, which is a D-shaped (or half-moon-shaped) scalene roller, is at a reference position or an initial position away from the recording sheet 13.

Next, when the conveying roller 14 is rotated in the normal direction by a predetermined amount, the feeding roller 41 rotates in conjunction with this rotation, and the - number of recording sheets 13 are fed to a position beyond the retracting portion of the conveying roller 14.

A sensor detects that the recording sheet 13 is connected to the retracting portion twice, and the stop position of the conveyance roller 14 at this time is controlled by a detection signal from the sensor.

Next, the conveyance roller 14 is reversed by a predetermined amount, and the leading edge of the recording sheet 13 is retracted to a position where it has come out of the sheet drawing section.

At this time, due to the reverse rotation of the & feed roller 14, the recording sort 13
Form a loop at the tip of the paper and register (recording sheet 13)
(the action of making the ends parallel) is performed.

The one-way clutch (e.g., spring clutch) 98
is still in an on state due to the franchise trigger, and is in a state where rotation can be transmitted in the normal rotation direction.

Therefore, the conveyance roller 14 is rotated forward by a predetermined amount, and the recording sheet 13 is conveyed to the recording start position (starting position) by the forward rotation of the conveyance roller 14 and the feeding roller 41.

During this normal rotation, when the D-shaped feeding roller 41 separates from the recording sort 13, that is, when the feeding roller 41 substantially rotates and returns to the reference position (initial position), the one-way clutch 98 is switched off, and the feed roller 41 stops at the reference position.

In this manner, only one recording sheet 13 is fed into the recording apparatus 10 during one rotation of the feeding roller 41, and is set in the cue state.

Thereafter, recording is performed on the recording sheet 13 based on the image information.

During this recording, the one-way club 98 remains off, and the feed roller 41 remains stopped at the reference position despite the normal rotation (paper feeding) of the conveyance roller 14.

Figure 19 shows the one-way clutch (spring clutch) 9.
Figures 20V to 23 are diagrams showing the control ring in Figure 191121 and the control lever 131 for regulating the operation of the control ring.

A one-way clutch (spring clutch) 98 attached to the feeding port-to-shaft 97 includes a boss portion (winding body) 176 that is integrated with the gear (taranochigya) 96, a coiled flange spring 177, and a clutch. drum 178 and
A control ring 179 is provided.

Further, as shown in FIGS. 20 to 23, the control ring 1
At 79, a control lever 131 for controlling the clutch operation is pressed radially inwardly and axially by a fIIH11 green 132.

The clutch drum 178 is fixed to the feed roller shaft 97 and rotates together with the feed roller shaft 97.

On the other hand, a clutch gear 96 having a boss portion 176 is rotatably fitted to a feeding roller shaft 97.

A clutch spring receiver is provided on the circumferential surface of the boss portion 176 and the clutch drum 178, and a coiled Franch spring 177 is ring-mounted astride both.

One end of the flange spring 177 is engaged with a hole 182 formed in the clutch drum 178, and the clutch drum 17
8 is always connected.

The other end of the crankshaft 2177 is hooked to a notch 183 formed in a control ring 179 that is rotatably fitted around the outer periphery of the crankshaft 177.

The control ring 179 has a shape as shown in FIGS. 20 to 23, and the left rotation in the plan view of FIG. 20 corresponds to the sheet feeding direction of the feeding roller 41.

The control lever 131 is rotatably fitted to a shaft portion 150 provided on the case body 129, and as shown in FIGS. 20 and 21, the control lever 131 is
The control ring 179 is biased axially (rightward in FIG. 21) and radially inward.

In the paper feeding standby state (the reference non-contact position of the feeding roller 41), the control lever 131 is caught in the notch 185 of the control ring 179 and stopped.

When a paper feeding command is received from the control unit, the conveyance roller 14 is first reversed by a predetermined amount, and in synchronization with this, the control ring 179 is rotated in the reverse direction (that is, clockwise rotation direction) via the clutch gear 96 and clutch spring 177. Turn the steering knob the specified number of times.

The rotation at this time reverses the conveyance roller 14 and rotates the clutch gear 96 in the direction in which the clutch gear 2177 wrapped around the boss portion (winding body portion) 176 loosens; however, in reality, Since the feeding roller shaft 97 is subjected to a small load such as contact with the recording sheet 13, the initial tightening torque of the Clasochiha 2177 acts, the rotation of the clutch gear 96 is transmitted, and the spring end of the Clasochiha 2177 is caught. The control ring 179 rotates in the reverse direction by a predetermined number of steps.

By this rotation of the control ring 179 in the opposite direction, the control lever 131 is moved to the slope portion 1 of the notch 185 of the control ring 179.
86 and the control ring moves radially outward along surface 187 .
It will start skating along the 18th.

Next, the control ring 179 is rotated approximately one rotation in the forward direction S.

That is, when the clutch spring 177 is rotated in the normal rotation direction in synchronization with the normal rotation of the conveyance roller 14, the clutch spring 177 wound around the boss portion 176 is rotated in the tightening direction; 176, the clutch spring 1
77 and the roller drum 178 rotate integrally, torque is transmitted to the feed roller shaft 97 and the feed roller 41, and the rollers are driven to rotate in the forward direction. At the same time, the control ring 179 engaged with one end of the clutch spring 177 is also rotated twice in the same direction Q.

Due to the rotation at this time and the biasing force of the control spring 132, the control lever 131 moves onto the surface 18B and is pressed against the surface 187.
88.

This forward rotation (normal rotation) drives the feeding roller 41 and starts feeding the recording note 13.

When forward rotation of a predetermined angle is performed, control lever 1
31 is first lowered by the slope 193 to the surface 189, and is guided to come into contact with the surface 189 following the monkey-two surface 194, and when it further rotates forward, the tip of the control lever 131 comes into contact with the notch 185 of the control ring l''19. The rotation of the control ring 1790 is stopped.

That is, due to the forward rotation of the predetermined angle, the control lever 131 is first dropped onto the surface 189 by the slope 193 and slides along the surfaces 187 and 189 by a predetermined angle.

When further rotated in the forward direction, the control lever 131
is lifted along slope 194 and then faces 189.1
Ski along 90.

Further rotate in the positive direction and after one rotation, the surface 189.19
0, the control ring 179 fits into the notch 185 formed at the position where it collides and falls, is locked in the notch 185, and the rotation of the control ring 179 is stopped.

By stopping the control ring 179, the one-way clutch 98 becomes clutch-off again (a state in which no torque is transmitted even in the forward rotation).

To summarize the above movements, the initial reversal of the control ring 179 (
A predetermined number of pulses) causes a paper feed trigger to rotate the feed roller 41 once, and from there the control ring 179
The feed roller 41 is rotationally driven while the control lever 131 rotates once in the forward direction, and the feed roller 41 and the control ring 179 rotate once and return to their initial positions. The clutch becomes stuck and the clutch is off, and the feeding roller 41 stops at the reference position.

In this way, the feeding operation of the recording sheet 13 is completed by rotating the feeding roller 41 once by using the bending force of the vj feeding roller 14.

As explained in Figure 14 and Part 15,
The sliders 71 and 72 include side guides 73 and 74 for regulating the width of the recording sort 13 and recording sheets 1.
Separation pawls 75, 76 are provided which engage on both sides of the front end of 3.

This separation claw 75.76 is not on the pressure plate 68 pushed down by the feed roller 41, but on the slider 71.7.
2, it is a so-called fixed type separation claw.

In the 14th and Fig. 15, each slider 71.7
2 is manually moved, and the clamp lever 101,
102 in the position shown.

By doing so, the guide groove (not shown) is pinched from both sides by the end cam means (not shown) and set at a predetermined width position by frictional force.

In the 17th time, the feeding roller 41 is integrally provided at a plurality of positions (two locations in the illustrated example) on the feeding roller shaft 97.

The feeding roller shaft 97 further includes each feeding roller 41.
A pseudo roller 103.103 is integrally provided at an outer position of the roller.

These pseudo rollers 103.103 are similar to the feeding roller 41.
．． 41, but the material and width are different, and the frictional resistance with the recording sheet 13 is small, and there is sliding contact during paper feeding, but the feeding force is substantially Consists of rollers that do not generate.

For example, the outer circumferential surface of the feeding rollers 41 and 41 is made of rubber that generates a large frictional force, but the pseudo roller 1
03.103 is made of plastic material such as Teflon or nylon (eg, integrally molded from the same material as the shaft 97), and has a smooth outer periphery.

By additionally providing the pseudo rollers 103, 103 with such a simple structure, even when the feeding rollers 41, 41 are fixed, the separation function of the separation claws 75, 76 for recording sheets 13 of different widths can always be maintained. Can be maintained properly.

Therefore, it is not necessary to use an expensive sliding structure as the paper feed rollers 41, 41, and costs can be reduced.

On the other hand, the sliding rollers 42 are integrally provided at a plurality of positions (for example, 3 to 5 positions) on the sliding roller shaft 47 at predetermined intervals.

FIG. 18 is a partial sectional view taken along the line X■-X■ during the 14th session.Next, referring to FIGS. 14 and 18,
The guide structure of the sliders 71 and 72 will be explained.

In FIGS. 14 and 18, the paper feed cassette.

Guide rails 105, 106, 107, and 108 are provided at predetermined intervals B on the inner surface 5 of the case of the top portion 50, and the left slider 71 is guided by the guide rails 105, 106, and the right slider 71 is guided by the guide rails 107, A slider 72 is guided.

As shown in FIG. 18, each guide rail 105 to 108 has a dovetail groove (groove with a tapered surface) 109 on the inside.
A dovetail-type guide rail is used.

Each guide rail 105 to 10B is a paper feed cassette.

It is formed integrally with the plastic case body of the front part 50.

On the other hand, a guide roller 110 that rolls in contact with a dovetail groove 109 of each of the guide rails 105 to 108 is rotatably supported on each of the sliders 7I and 72.

In the illustrated example, each slider 71, 72 is guided and supported by a total of three guide rollers 110, one on the upper side and two on the lower side, as shown in the 14th time.

In FIG. 17, the feeding roller shaft 97 has a ratchet portion 11 having a plurality of ratchet teeth on an arcuate outer periphery.
1 is integrally formed, while an automatic paper feeder 30
The case body example (in the illustrated example, the case body of the paper feed drive section 40) is pressed against the ratchet teeth of the ratchet section 111 with a predetermined elastic force, and is engaged with the ratchet teeth to form a sliding roller shaft. A plate-shaped claw portion 112 extending from 47 is provided in a protruding manner.

These ratchet portions 111 and pawl portions 112 constitute a ratchet mechanism for preventing the feeding roller 41 from rotating in reverse.

As shown in FIG. 17, one side of the paper feed drive unit 40 transmits the rotational force transmitted from the conveyance roller 14 of the recording device 10 to the driven gear 48 to the feed roller 41 and the sliding roller 42. Gear train 93.94 for transmission.
95.46.96 are pivoted.

FIG. 24 is a side view showing a state in which the gear train is pivotally supported by - number of bearing plates 130 on one side of the paper feed drive section 4o.

In FIG. 24, the bearing plate 130 is a plate-shaped member made of plastic molding or the like, and the end portion of the sliding roller shaft 47 having the idle gear 93, 94 and the sliding roller gear 95 is A spring clutch (one-way clutch) 9 is connected to the idle gear 46 and the feed roller shaft 97.
A feed roller gear 96 coupled via 8 is pivotally supported.

Furthermore, the bearing plate 130 allows the spring clutch 9 to
The control lever 131 of No. 8 and the control spring 132 of the lever are also prevented from coming off.

Therefore, the bearing plate 130 is removably positioned and fixed to the case body 129 of the paper feed drive section 40 by the following structure.

First, the bearing plate 130 abuts against three abutting portions 133, 134, and 135 formed on the case body 129, thereby restricting the same axial position of each gear of the gear train.

Further, the bearing plate 130 has two positioning fitting portions 136.
．． 137, the position in the left, right, top and bottom directions during the 24th rotation is regulated.

Note that one positioning fitting part 137 is provided at the same position as the abutting part 135.

Next, the bearing plate 130 is fixed by three fixing claws 138, 139, and 140 formed on the case body 129.

As described above, by simply fixing one bearing plate 130 to the case body 129, the multiple gears and roller shafts that make up the gear train can be positioned and prevented from coming off. The levers and biasing springs are positioned and prevented from falling off.

25th to 31 are partial cross-sectional views showing specific structures of the respective parts in FIG. 24.

FIG. 25 shows the bearing structure of the feed roller gear 96 along the line XX to '-xxv in FIG.
The gear 96 coupled via the shaft 141 is connected to the bearing plate 130! By fitting into the formed bearing hole 142, it is positioned and prevented from coming off, and is rotatably supported.

Figure 26 shows the line XX~l -X X', 1 in Figure 24.
along the abutting portion 135 and the positioning fitting portion 1
37, and in the same figure, the bearing plate 130 has:
A linear elongated hole 143 connecting the other positioning fitting portion 136 is formed, and the elongated hole is fitted into the tip shaft portion 144 of the abutment portion 135 of the case body 129, and the bearing plate 130 is By abutting against the end surface of the abutting portion 135, the bearing plate 130 is regulated in its position in the left and right direction in FIG.
The distance H is regulated.

FIG. 27 shows the structure of the abutment portion 133 along the line Xx■-XX■ in FIG. The distance H between the bearing plate and the case body 129 is regulated.

Note that the abutting portion 134 in FIG. 24 also has a structure and dimensions that are substantially spaced from the abutting portion 133.

Therefore, the bearing plate 130 has three abutting portions 13.
3.13 While in contact with 4.135, case body 12
The distance H from 9 to 9 is accurately regulated.

FIG. 28 shows the structure of the positioning fitting portion 136 of the bearing plate 130 along the line XX■-XX■ in FIG. 24, and in the figure, the stepped boss portion 14. A fitting hole 146 is formed on the tip surface of the bearing plate 130, and by fitting a protrusion 147 formed on one side of the bearing plate 130 into the fitting hole 146, the vertical and horizontal positions of the bearing plate 130 can be adjusted. regulated.

Therefore, the position of the bearing plate 130 in the vertical and horizontal directions and in the rotational direction is regulated by the two positioning fitting parts 137 and 136.

Note that the idle gear 46 is rotatably fitted to the outer periphery of the shaft portion 148 of the stepped boss portion 145. Therefore, the positioning fitting portion 136 in FIG. It also has a locking function.

FIG. 29 shows the engagement structure of the fixing claw 138 along the line XXIX-XXIX in FIG. The bearing plate 130 is fixed in a predetermined position by punching the fixing claw 138 through an opening or notch 149 formed in the bearing plate 130 as shown in the figure.

The other two fixing claws 139 and 140 in FIG. 24 also have substantially the same engagement structure as the fixing claw 138 in FIG. On the other hand, there are a total of 3 fixed claws 138.139.
140, it is fixed at a predetermined position (position at interval H).

FIG. 30 shows a structure for preventing the control lever 131 and the spring 132 from coming off along the line XXX-XXX in FIG. This, the control lever 131
g Yohi torsional recoil spring 132 is installed, and by fixing the bearing plate 130 at a predetermined position (position with distance H), the control lever 131 Oyohi HI4
The B spring I32 is held in a predetermined position and prevented from coming off.

Note that the control lever 131 and the control spring 1
Reference numeral 32 is for controlling one rotation operation (heading operation of the recording sheet 13) of the spring clutch (one-way clutch) 98 provided on the feed roller shaft 97.

FIG. 31 shows the bearing structure of the sliding roller shaft 47 along the line XXXI-XXX1 in FIG.
7, and the end of the sliding roller shaft 47 is rotatably fitted into a bearing hole 151 formed in the bearing plate 130.

With the structure shown in FIG. 31, the sliding roller shaft 47,
That is, the sliding roller 42 and the sliding roller gear 95 provided on the shaft are positioned and prevented from coming off.
It is pivoted.

According to the bearing structure of the gear train described above with reference to FIGS. 24 to 31, the bearing structure of the gear train is detachably attached to the recording apparatus 10 and supplies the driving force from the drive mechanism of the conveyance roller 14 of the recording apparatus IO. In an automatic paper feeding device 30 equipped with a gear train for transmitting information to the roller 41 and the sliding roller 42, positioning and prevention of each gear in the gear train, and
An automatic sheet feeding device was obtained in which the rollers 41, 42, lever 131, lotus 132, etc. are positioned and prevented from coming off by one bearing plate 130 which is punch-fixed to the main body 40 of the device.

According to such a bearing structure, a plurality of component parts such as gears and rollers can be assembled with one bearing plate 130 with a simple structure with a small number of parts and with high precision. An automatic sheet feeding device was obtained in which the column module can be made smaller to make the device more compact.

The recording device IO may be a serial scan type recording device in which a recording head is mounted on a carriage that moves along the recording sheet 13, or a serial scan type recording device that has a recording head mounted on a carriage that moves along the recording sheet 13.
Any type of recording device can be used, such as a line-type recording device that uses a recording head that covers a recording area in the paper width direction.

In addition to the recording apparatus 10 that uses one recording head, the recording apparatus 10 may be a color recording apparatus that uses recording heads of multiple colors, or a gradation recording apparatus that uses multiple recording heads that have the same color but different densities. A recording device with any number of recording heads can be used, such as a recording device.

The present invention is particularly effective in a printing apparatus that uses an inkjet printing method among various printing methods, and in particular, uses a bubble jet printing head proposed by Canon Corporation.

As for typical configurations and principles thereof, it is preferable to use the basic principles disclosed in, for example, US Pat. No. 4,723,129 and US Pat. No. 4,740,796.

This method can be applied to both the so-called on-demand type and the continuous type, but in the case of the on-demand type, it is especially applicable to the sorting and liquid paths in which liquid (ink) is held. By applying at least one drive signal to the disposed electrothermal transducer that corresponds to the recorded information and provides a rapid temperature rise exceeding nucleate boiling,
This method is effective because it generates thermal energy in the electrothermal transducer to cause film boiling on the heat-active surface of the recording head, resulting in the formation of bubbles in the liquid (ink) in one-to-one correspondence with this drive signal.

Due to the growth and contraction of these bubbles, liquid (
ink) to form at least one droplet.

If this drive signal is in the form of a pulse, bubble growth and contraction will occur immediately and appropriately, so liquids with particularly excellent responsiveness (
Ink) can be ejected, which is more preferable. As this pulse-shaped drive signal, those described in US Pat. No. 4,463,359 and US Pat. No. 4,345,262 are passed.

Further, if the conditions described in US Pat. No. 4,313,124 concerning the temperature increase rate of the heat acting surface are adopted, even more excellent recording can be achieved.

In addition to the configuration of the ejection port, liquid path, and electrothermal transducer combination (straight liquid flow path or right-angled liquid flow path) as disclosed in the above-mentioned specifications, the configuration of the recording head and the U.S. Pat. No. 4,558,333 and U.S. Pat. No. 4,459, which disclose a structure in which the action part is arranged in a bending region.
A configuration using the specification of No. 0 is also included in the present invention.

In addition, Japanese Patent Application Laid-open No. 123670 of 1982 discloses a configuration in which a common slit is used as a discharge part for a plurality of electrothermal converters, and a hole that absorbs pressure waves of thermal energy is disclosed. The present invention is also effective as a configuration based on Japanese Patent Application Laid-Open No. 138461 of 1981, which discloses a configuration in which a discharge portion corresponds to a discharge portion.

Furthermore, as a full-line type recording head having a length corresponding to the width of the maximum recording medium that can be recorded by the recording apparatus, the length can be increased by combining multiple recording heads as disclosed in the above-mentioned specification. Either a configuration that satisfies the above requirements or a configuration as a single recording head formed integrally may be used, but the present invention can more effectively exhibit the above-mentioned effects.

In addition, by being attached to the main body of the device, it is possible to make electrical connections with the main body of the device and supply ink from the main body of the device. The present invention is also effective when using a cartridge type recording head.

Further, it is preferable to add recovery means, preliminary auxiliary means, etc. for the recording head, which are provided as a configuration of the recording apparatus of the present invention, because the effects of the present invention can be further stabilized.

Specifically, these include preheating of the recording head using a capping means, a cleaning means, a pressurizing or suction means, an electrothermal transducer or a separate heating element, or a combination thereof. It is also effective to perform a preliminary ejection mode in which ejection is performed separately from recording.

Furthermore, the recording mode of the recording apparatus is not limited to a recording mode of only royal colors such as satoiro, the recording head may be configured integrally or a plurality of them may be combined, but it may also be a multiple color of different colors or The present invention is also extremely effective for devices equipped with at least one full color by color mixture.

In the embodiments of the present invention described above, the ink is described as a liquid, but in the present invention, it is possible to use ink that is solid at room temperature or ink that is soft at room temperature. can.

In the above-mentioned inkjet device, the ink itself is heated to 30°C.
It is common to adjust the temperature within the above range of 70°C or less so that the viscosity of the ink is within the stable ejection range, so if the ink is in a liquid state when the recording signal is applied, then In addition, it is possible to prevent the temperature increase due to active thermal processing by using it as energy to transform the ink from a solid state to a liquid state, or to prevent the ink from evaporating by leaving it for the purpose of preventing evaporation. Some use ink that solidifies, but in any case, the ink liquefies and is ejected as a liquid ink by applying thermal energy in response to a recording signal, and some that already begin to solidify when reaching the recording material. It is also applicable to the present invention to use inks that are liquefied only by thermal energy, such as inks such as inks that are liquefied only by thermal energy.

In such a case, the ink is held in a liquid or solid state in the recesses or through holes of the porous sheet, as described in JP-A-54-56847 or JP-A-60-71260. In this case, it may be arranged so as to face the electrothermal converter.

In the present invention, the most effective method for each of the above-mentioned inks is to implement the above-mentioned film boiling method.

Effects of the Invention: As is clear from the above description, according to the present invention, a gear is detachably attached to a recording device and transmits the driving force of the conveying roller of the recording device to the feeding roller. In an automatic paper feeder equipped with a row of gears, each gear of the gear row is positioned and prevented from coming off by a single bearing plate attached to the main body of the device, so the structure is simple with a small number of parts, and The gear train for transmitting driving force to the feeding rollers can be easily and precisely mounted to the device body in a positioning and non-removable state, and the gear train module can be made smaller to accommodate the equipment. Provided is an automatic paper feeder that can be made more compact.

[Brief explanation of the drawing]

The first section is a schematic longitudinal cross-sectional view showing a state in which an automatic sheet feeding device according to an embodiment of the present invention is installed in a recording device during automatic sheet feeding;
Fig. 2 is a schematic vertical cross-sectional view showing the state during the first manual feeding, the third view is a schematic longitudinal cross-sectional view showing the state during the tenth storage, and Fig. 4 is a schematic vertical cross-sectional view showing the state during the first manual feeding. FIG. 5 is a schematic perspective view showing a state in which the recording device is used horizontally; FIG. 5 is a partially cutaway perspective view schematically showing the internal structure of the recording device in FIG. Schematic bottom view showing the bottom of the recording device in Figure 7.
The figure is a schematic perspective view of the first automatic paper feeder as seen from the installation side, and Figure 8 is the main part showing the long state of the hook connection part between the recording device and the automatic paper feeder in Figure 1. A sectional view, No. 9V is a main part sectional view showing the unlocked state in FIG. 8, No. 1
0th time is a sectional view of the main part showing the positioning and securing part of the recording device and automatic paper feeder in FIG. 1, and FIG. 11 is a line XI in FIG. 10.
-XI, FIG. 12 is a schematic vertical cross-sectional view of the automatic paper feeder in the automatic paper feeding state in FIG. A schematic vertical cross-sectional view of the state, Fig. 14 is a partially removed front view of the paper feed cassette section of the 12th automatic paper feeder, and Fig. 15 is a partially removed front view of the paper feed cassette section of the 121211 automatic paper feeder. 161 is a partially removed perspective view showing the operating mechanism between the paper feed drive section and the paper feed mechanism of the automatic paper feeder shown in FIG. 12, and No. 17
The figure is a partially removed perspective view schematically showing the drive mechanism of the paper feed roller of the automatic paper feeder in the 12th view, and the guide roller of the slider is shown in FIG. FIG. 19 is a joint sectional view schematically showing the structure of the one-way clutch in FIG. 17, and FIG.
front view V showing the control ring and control lever in l;
Fig. 21 is a side view of the control ring seen from the line XX I - XX l in Fig. 20, Fig. 221 is a side view of the control ring seen from the line Line XX in the diagram
A side view of the control ring seen from I line XXv
A cross-sectional view along XXv, FIG. 26 is the line x in FIG. 24.
x vi-x cross-sectional view, second
Figure 9 is a cross-sectional view taken along the line XXIX-XX■ in Figure 24, Figure 30 is a cross-sectional view taken along the line XX N-X Line XXX l-\
FIG. 3 is a cross-sectional view along XXI. Below, symbols representing important components in the drawings are listed. 10--recording device, 13--recording sheet, 14 conveyance roller, 15- recording head, 16 ejection tray, 22
-----Kijima Sunji, 2B---- Recording sheet insertion slot (
recording device), 30---automatic paper feeder, 31---
G bus surface, 33-1 drive gear, 34 transport motor, 35-
Frame member (recording device), 3 B---Hook member, 40
---Paper feed drive unit, 41 feeding roller, 42--111 sliding contact roller, 47 sliding contact roller shaft, 48-=-driven gear (transfer gear), 49--exit (automatic paper feeding device )
, 50--Paper feed force center section, 54.55.56.57 Positioning engagement section, 6 B----One pressure plate, 71.72 Slider, 73.74---Side guide, 75.76=-Fixed Mold separation claw, 95 --- Gear (sliding roller shaft), 96
---Gear (Thalassochi gear), 97--Feeding roller shaft, 98-1-One-way clutch (spring clutch)
, 129 - case body (paper feed drive section), 130 -
Bearing plate, 131- Control lever, 132--Control C♀, 133.134.135- Abutting portion, 1
36.137 Positioning fitting part, 138.139.140
Fixed claw, 142 - bearing hole, 145 - stepped boss part,
l 47---Protrusion for positioning, 149 opening or notch, 150--Shaft portion, 151 Bearing hole. Figure 7 Figure 29

Claims (4)

[Claims] (1) In an automatic paper feeding device that is detachably attached to a recording device and includes a gear train for transmitting the driving force of the conveyance roller of the recording device to the feeding roller, positioning of each gear of the gear train An automatic paper feeding device characterized in that the sheet feeding device is prevented from coming off by a single bearing plate attached to the main body of the device. (2) The automatic paper feeder according to claim 1, wherein the bearing plate also serves to position and prevent a roller, a lever, a spring, or the like from coming off. (3) The automatic paper feeding device according to claim 1 or 2, wherein the bearing plate is snap-fastened to the main body of the device by fixing claws at three locations. (4) The automatic paper feeder according to any one of claims 1 to 3, wherein the recording device is an inkjet recording device that performs recording by ejecting ink using thermal energy.