JPH03259829A - Automatic paper feeding device - Google Patents

Abstract

PURPOSE:To simplify the structure by making a feed roller into a semi-circular form, and providing a one-rotation spring clutch for controlling on/off of a clutch every rotation on a driving force transmitting means. CONSTITUTION:Two semi-circular feed roller 53 (53A and 53B) is installed to a paper feed shaft 52 in such a manner as to rotate integrally, and a concentric and circular free rotating roller 64 is rotatably fitted thereto. The outer diameter of the free rotating roller 64 is selected to a size slightly smaller than the feed surface outer diameter of the feed roller 53A and larger than the notch part of the feed roller. The rotation of an input gear is transmitted to a gear (clutch gear) 74 on the paper feed shaft 52, and a rotating spring clutch 75 is provided between the gear 74 and the paper feed shaft 52. Thus, paper feed operation is terminated by one rotation of the feed roller 53. Hence, the semi-circular notch part is not in contact with a recording sheet 54 but opposite thereto, and only the free rotating roller 64 can be pressed onto the recording sheet 54 and certainly refed.

Description

[Detailed description of the invention] [Industrial application field] The present invention provides a method for processing stacked recording sheets (cut sheets),
-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.

[Conventional technology]

Recording devices such as printers, copiers, and facsimile machines print a recording sheet 1 such as paper or a thin plastic plate by driving an energy generator in a recording head according to recorded information.
- It is configured to record images on (recording 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 I used in the recording apparatus include thick paper such as postcards and envelopes, and special sheets such as thin plastic plates.

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

The automatic paper feeding device generally includes a paper feeding drive unit that rotates a feeding roller to feed out the recording sheets, and a sheet stacking unit that stacks and holds the recording sheets, and feeds the recording sheets in synchronization with the conveyance system of the recording device. The recording sheet is configured to be separated and fed one by one by driving the paper feed drive section.

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.

The automatic paper feeding device described in 2 below includes a feeding roller that feeds the stacked recording sheets I, a separating means that separates the recording sheets one by one, and a conveying roller of the recording device in synchronization with the conveying roller of the recording device. 2. Description of the Related Art An automatic sheet feeding apparatus is known that includes a driving force transmission means capable of driving the feeding roller.

In this type of automatic sheet feeder, generally, a plurality of recording sheets stacked on a sheet stacking plate are pressed against the feed roller by a spring biasing means, and the feed roller is rotationally driven. The uppermost recording sheet is separated by a mold separating means or bank separating means arranged in front of the feeding roller, and is fed one by one to a predetermined position within the recording apparatus.

Documents disclosing this type of prior art include Japanese Patent Publication No. 58-6
No. 633, Japanese Patent Publication No. 60-25776, Special Publication No. 63-6
7477 etc.

[Technical problem to be solved by the invention] By the way, in this type of automatic paper feeder, when the first recording sheet is fed or conveyed, the second and subsequent recording sheets are need to be prevented from being brought in.

Furthermore, in order to reliably draw in the recording sheet with the conveyance roller of the recording apparatus, it is necessary to eliminate the frictional resistance (brake) when the conveyance roller stops, but to make it slight.

Therefore, in conventional automatic paper feeding devices of this type, since the above conditions are not met, the driving force transmission mechanism (transmission mechanism) of the feeding roller is
A one-way clutch is provided in the motor vehicle, but the structure provided with this one-way clutch has a problem that the structure is complicated and large, and the cost increases.

Furthermore, in the conventional configuration, since the feeding roller is always in pressure contact with the recording sheet, it is difficult to sufficiently reduce the resistance when drawing out the recording sheet.

Furthermore, since the one-way clutch is provided, there is a problem in that noise is generated not only when the clutch is turned on and off, but also when it rotates.

The present invention has been made in view of such technical problems, and even in a configuration in which the feeding roller is driven using the driving force of the conveying roller of the recording device, a one-way clutch or the like is not included in the feeding roller drive system. It is possible to reliably separate the stacked sheets one by one with a simple, compact, and inexpensive structure that would otherwise require a complicated structure, and the force to pull out the recording sheet is extremely small because the feeding roller does not come into contact with the recording sheet when it is stopped. The purpose of the present invention is to provide an automatic paper feeding device that can.

[Means for solving problems]

The present invention provides a feeding roller that feeds a stack of recording sheets, a separating means that separates the recording sheets one by one, and a driving force capable of driving the feeding roller in synchronization with a conveying roller of a recording device. an automatic paper feeding device having a transmission means, wherein the feeding roller is a half-moon roller whose cross section has an equal radius surface and an unequal radius surface, and the driving force transmission means includes a clutch gear having a boss portion. a clutch spring having one end connected to the driven side and mounted across the boss portion and the driven side; a control ring that engages the other end of the clutch spring; and a control ring that controls the rotation and stopping of the control ring. By providing a one-rotation spring clutch with a control means that regulates the on/off of the clutch for each rotation, the feeding roller can be driven using the driving force of the conveying roller of the recording device. Even in a configuration where the feed roller drive system does not require a complicated structure such as a one-way clutch, it is possible to reliably separate the stacked sheets one by one with a simple, compact, and inexpensive structure, and it is possible to record when the feed roller is stopped. The present invention provides an automatic paper feeder that can extremely reduce the force required to pull out the recording sheet 1- since it does not come into contact with the sheet.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings. FIG. 1 shows an embodiment of the automatic paper feeder according to the present invention, along the line I in FIG. 2.
- This is a front view seen from 1, and the second is the line ■- in Figure 1.
FIG. 3 is a cross-sectional view of the automatic paper feeder of FIG. 1 attached to a recording apparatus, and FIG. 4 is a plan view of FIG. 3.

In FIGS. 1 to 4, the frame 51 of the automatic paper feeder 50
The left side part has a gear box part 51A, and the middle part has a sheet stacking plate support part 51B.
However, a cover portion 51C is formed on the right side portion.

The paper feed shaft 52 passes above the sheet I/loading plate support section 51B, and its both ends are rotatably supported by the gear box section 51A and the cover section 51C.

Two feed rollers 53 (53A and 53B) are attached to the paper feed shaft 52 so as to rotate together, and in the illustrated example, one feed roller 53A is attached to the sheet along the shaft 52. 1 so as to be movable in the width direction, and the other feeding roller 53B is fixed to the shaft 52.

A sheet stacking plate 55 capable of stacking a plurality of recording sheets (cut sheet 1-) 54 is stably held in the sheet stacking plate supporting portion 51B of the frame 51 so as to be movable in the vertical direction. 55 is connected to the feeding roller 5 by a pressing spring 56 (FIG. 2) installed between the frame body 51 and the feeding roller 55.
3A and 53B.

Therefore, the recording sheets 54 stacked on the sheet stacking plate 55 are transferred to the feed roller 5 by the springs 56.
3A and 53B are always biased.

When using sheets of different sizes as the recording sheet 54, or depending on whether sheets of the same size are fed vertically or horizontally, the position of the feeding roller 53A can be adjusted together with a sheet guide 65, which will be described later. ing.

In front of the feeding roller 53 (generic symbols 53A, 53B) in the feeding direction or at a position adjacent to the front end of the sheet stacking plate 55, there is a bank separation consisting of a slope on which the uppermost recording sheet 54 can ride. Means 57 are provided.

In this embodiment, the bank separation means 57 is formed in part with the frame 51.

As the feeding roller 53, a half-moon-shaped roller whose cross section has a half-moon shape (or D-shape) having an equal radius surface and an uneven radius surface is used.

The equal radial surface is a circumferential surface that presses against the recording sheet 54 to feed the recording sheet, and the unequal radial surface is a peripheral surface that presses against the recording sheet 54 and feeds the recording sheet, and the unequal radial surface is a peripheral surface that presses against the recording sheet 54 and feeds the recording sheet, and the unequal radial surface is a peripheral surface that presses against the recording sheet 54 and feeds the recording sheet, and the unequal radius surface is a peripheral surface that presses against the recording sheet 54 and feeds the recording sheet. This is the peripheral surface away from the recording sheet 54.

The automatic paper feeder 50 of this embodiment is mounted externally to the recording apparatus 10 and is driven using power from a conveying roller driving source of the recording apparatus 10 or the like.

FIG. 5 is a longitudinal sectional view of the feed roller 53A on the paper feed shaft 52, FIG. 6 is a sectional view taken along line V-■ in FIG. 5, and FIG. FIG. 6 is an end view taken along the line ■-■ in FIG. 5;

In FIGS. 5 to 7, the feeding roller 53A includes a boss portion 58 formed of hard plastic or the like and fitted onto the paper feed shaft 52, and a rubber layer fixed to the outer peripheral surface of the boss portion by adhesive or the like. It consists of 59.

As described above, the rubber layer 59 has an equal radial surface that generates a feeding force and an unequal radial surface that separates from the recording sheet 1-54, and its cross-sectional shape is a part of a circular arc as shown in the figure. It has a half-moon or D shape with the string cut off.

The host portion 58 is integrally connected to the paper feed shaft 52 by engaging and fitting an axial protrusion 60 formed on the inner diameter surface with an axial groove 61 formed on the paper feed shaft 52. It is attached so that it can rotate and slide within a predetermined range in the axial direction.

The boss portion 58 integrally includes a cylindrical portion 62 having a smaller diameter than the feed roller portion and extending in the axial direction concentrically with the paper feed shaft 52, and a flange portion 63 for preventing removal at the tip of the cylindrical portion 62. It is formed.

A concentric, perfectly circular, freely rotatable l-r 64 is rotatably fitted onto the outer circumferential surface of the cylindrical portion 62 .

The outer diameter of this freely rotating roller 64 is the same as that of the feeding roller 53.
The dimension is selected to be slightly smaller than the outer diameter of the sheet feeding surface (uniform radius surface) of A, and larger than the notch portion (unequal radius surface) of the feeding roller.

The free rotation roller 64 is made of a material with a relatively small coefficient of friction, such as hard plastic.

Further, the cylindrical portion 62 of the boss portion 58 of the feeding roller 53A is provided with a tip portion 113 (see FIG. 18 and
9) shows the flange portion 63 and the free rotation roller 64.
is engaged with the end face of the seat, so that the position can be adjusted simultaneously in the width direction of the seat.

As will be described later with reference to FIGS. 18 and 19, this sheet guide 65 is arranged to
It is attached so that it can move (slide) over a predetermined range in the seat width direction.

The sheet guide 65 moves toward and away from the feeding roller 53 together with the sheet stacking plate 55 (in the illustrated example, in the vertical direction), so that the front end of the sheet guide 65 engages with the flange portion 63. The portion 113 is formed substantially vertically so as to be properly engaged regardless of the vertical position of the sheet stacking plate 55 (the stacking height of the recording sheets 54).

The feeding roller 53B and free rotation roller 64 on the right side in FIG. 1 are attached to fixed positions on the paper feeding shaft 52, and have a structure that is substantially symmetrical in top view with the feeding roller 53A described above.

However, since the feed roller 53I3 is fixed to the paper feed shaft 52, in the illustrated example, the flange portion 63 and the sea I/Guy I 565 are omitted, and the same functions as these are provided by the cover of the frame 51. It is configured to be exerted on the inner wall surface of the portion 5LC.

In addition, the position of the right feeding roller 53B can be adjusted,
Of course, a free rotating roller 64 and a sheet guide 65, or parts equivalent to these, can be provided on the right side along with the feeding roller 53B, so that the structure can be symmetrically formed.

2 The automatic paper feeder 50 according to the embodiment of the present invention described above has a recording section W.
10, and is driven using the driving force of the conveyance roller of the recording apparatus 10.

Note that the recording apparatus 10 of this embodiment is used in an upright state as shown in FIGS. 3 and 4 when the automatic paper feeder 50 is attached, and is used alone without the automatic paper feeder 50 attached. When in use, it can be placed horizontally as shown in Figure 8.

A schematic configuration of the recording apparatus 10 will be explained using FIG. 3 and FIG. 8.

3 and 8, a recording device (for example, a recording device that uses the bubble sheller I recording method and that forms an image using a recording liquid that uses thermal energy to form droplets of the recording liquid) ) 10 has a seat insertion slot 11 and a seat 1-ill' exit 12 on the top surface (front in standing position).
is formed, and the recording sheet inserted from the sheet I/insertion port 11 is moved by a platen roller 1 which also serves as a sheet feeding roller.
The recording sheet 1 formed in a substantially U-shape is generally fed once in the direction of arrow A along the general feeding path, and is recorded while passing through the recording section facing the recording head 15. , after recording, from the sticker outlet 12 upwards (in front when standing)
is discharged to.

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.). ), the cell I is in the closed position as shown by the solid line in Figure 3.
・Recording section N1 in which a sheet insertion port 11, a sheet discharge port 12, and other switches, indicators, etc. are arranged.
This functions as a cover 16 that covers and protects the top surface of the 0.

In FIG. 3, the recording head 15 is connected to the platen roller 1.
It is mounted on a carriage 22 that reciprocates along a guide shaft 21, 21 parallel to 4.

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

A sheet pressing member 23 for pressing the recording sheet 1 against the platen roller 14 is disposed on the downstream side in the conveyance direction of the recording sheet 15.

This sheet pressing member 23 is pressed against the peripheral surface of the platen roller 14 by a spring (not shown).

Further, the pressing force of the sheet pressing member 23 can be released by operating a lever or the like.

Furthermore, a spur 26 and a paper ejection roller 27 are provided at the sheet ejection port 12 to assist in ejecting the recording sheet I.

FIG. 14 is a diagram showing the bottom surface of the recording apparatus 10 (the back surface on which the automatic paper feeder 50 is attached in the upright position).

A second sheet insertion port 28 is formed on the back side of the recording device 10, and the sheet passes through the recording section between the recording head 15 and the conveyance roller (platen roller) 14 from this insertion port 28 to the sheet discharge port 12. The generally linear second recording sea H general feeding path is configured to extend in a substantially horizontal direction.

This second recording sheet general feed path can be used when the recording section W 105 is upright, and since it is not curved, it can be used for thick sheets such as postcards and envelopes, or special sheets such as plastic sheets. This method has the advantage that even stiff recording sheets can be easily fed in duplicate.

In this upright position, as shown in Figures 3 and 4,
The automatic paper feeder 50 is detachably attached, and the recording sheets 54 are automatically fed one by one from the sheet insertion slot 28 on the back (when erected).

Therefore, the automatic paper feeder 50 has an entrance (sheet insertion slot) 2.
8 to feed the recording sheet 54 into this linear conveyance path, and
It is removably attached to the opening surface of the

When the automatic paper feeder 50 is installed in the recording apparatus 10, in the illustrated example, the paper feed tray 16 is placed in the open position as shown by the dotted chain line in FIG. used.

The recording sheet 54 fed from the automatic paper feeder 50 through the sheet insertion hole 28 is first fed between the six conveyance rollers 14 and the sheet pressing member 23, and is rotated synchronously at approximately the same circumferential speed. The paper is fed to the paper feeding position (usually the cue position) by the conveying roller 14 and the feeding roller 53.

After the half-moon-shaped feeding roller 53 returns to the initial position and the sheet feeding force is released, the recording operation is started, and recording is performed on the recording sheet 54 while being conveyed by the conveying roller 14.

The recording sheet 54 sent by the conveyance roller 14 is transported by a paper ejection roller 27 and a spur 26 disposed near the sheet ejection port 12.
Thereafter, the sheet is conveyed by the conveyance roller 14 and the discharge roller 27, which are driven synchronously.

This paper ejection roller 27 is also driven synchronously with the transport roller 14 at approximately the same circumferential speed, and during subsequent recording operations, the recording sheet 54 is transported by the transport roller 14 and the paper ejection roller 27. The recording sheet 54 that has been recorded is discharged onto a paper discharge tray 16 (a cover that also serves as a paper feed tray of the recording apparatus 10).

Note that the recording sheet 54 is pulled out by the conveyance roller 14 or the first general feed roller and the paper ejection roller 27,
When the recording sheet 5 is transported, the recording sheet 5 is placed in the automatic paper feeder 50.
4, the recording sheet 54 at this time is in pressure contact only with the freely rotatable roller 64 and is separated from the feeding roller 53, so the recording sheet 54 can be pulled out with almost no resistance. This makes it possible to eliminate the braking action during conveyance of the recording sheet, and also to prevent double feeding of the second and subsequent recording sheets.

When the automatic paper feeder 50 is attached to the recording device 10,
A gear (output gear from the recording device 10) 71 fixed to the shaft of the sheet 1-II feed roller 14 and an input gear 72 provided in the gear box 51A of the automatic paper feeder 50 mesh (
1M and 3).

Therefore, the input gear 72 is rotationally driven in synchronization with sheet conveyance of the recording apparatus 10.

The rotation of this input gear is transmitted to a gear (clutch gear) 74 on the paper feed shaft 52 via a gear 73 8 Here, a rotating spring clutch 75 is provided between the gear 74 and the paper feed shaft 52 . It is provided.

This one-turn spring clutch 75 operates as follows.

That is, in conjunction with a small amount of reverse rotation (rotation in the opposite direction to the conveying direction) of the sheet 1 general feed roller (platen roller) 14 based on the paper feed signal, the rotational spring clutch 75
In this case, the feed roller 53 is reversed at the reference position or initial position away from the recording sheet 54, and due to this reverse movement, the locking with the control means such as the control lever (hook) to prevent rotation in the recording direction is released. Then, the spring clutch 75 is switched from off to on.

Note that even when the feeding roller 53 is separated from the recording sheet 54, the free rotating roller 64, which has a perfect circular cross section, is in pressure contact with the recording sheet 54.

Convey roller (platen roller) 1 with clutch on
By rotating the feeding roller (D-shaped roller or half-moon roller) 53 by a predetermined amount of rotation in the recording direction of 4, the recording sheet 59 is separated by one sheet and the platen roller] 4 is rotated. When the paper is fed to a position beyond the sheet pull-in portion and returned to the initial position (a position where a gap occurs between the feeding roller 53 and the recording sheet 54), the control means is again locked at the recording direction rotation prevention position. Then, the honey cruncher 5 is turned off to cut off the interlock between the platen roller 14 and the feeding roller 53, and the feeding roller 53 is stopped.

In this way, only one recording sheet 54 is separated and fed during one rotation of the feeding roller 53 (paper feeding shaft 52).

FIG. 9 is a longitudinal sectional view showing the structure of the one-turn spring clutch 75, and FIGS. 10 to 13 are views showing the control lever (control means) and control ring in FIG. 9.

One-turn spring clutch 7 attached to the paper feed shaft 52
5 includes a boss portion (winding body portion) 76 that is integral with the clutch gear (input gear) 74, a coiled clutch spring 77, a clutch drum 78, and a control ring 79.

0 Also, as shown in FIGS. 10 to 13, the control ring 7
At 9, a control means (control lever) 80 for controlling the clutch operation is connected to a control spring 8.
1 in the radial inward direction and in the axial direction.

The clutch drum 78 is fixed to the paper feed shaft 52 with a parallel pitch or the like, and rotates integrally with the paper feed shaft 52.

On the other hand, the clutch gear 74 having the boss portion 76 is connected to the paper feed shaft 5.
2 is rotatably fitted. A clutch spring receiver is provided on the circumferential surface of the boss portion 76 and the clutch drum 78, and a coiled clutch spring 77 is installed astride both sides.

One end of the clutch spring 77 is engaged with a hole 82 formed in the clutch drum 78, and is constantly connected to the clutch drum 78.

The other end of the clutch spring 77 is hooked onto a notch 83 formed in a control ring 79 rotatably fitted around the outer periphery of the clutch spring 77.

The 11i11 fff11 ring 79 has a shape as shown in FIGS. 10 to 13, and the left rotation in the plan view of FIG. 10 corresponds to the sheet feeding direction of the feeding roller 53.

The control lever 80 is rotatably fitted to a shaft 84 provided in the gear box portion 51A of the frame 51, and as shown in FIGS. 11, and is biased inward in the axial direction (to the right in FIG. 11) and in the radial direction.

In the paper feeding standby state (the reference non-contact position of the feeding roller 53), the control lever 80 is caught in the notch 85 of the control ring 79 and stopped.

At this time, the recording sheet 54 is transferred to the freely rotating roller 64.
64.

When a paper feeding command is received from the control section, first, the conveying roller 14 is reversed by a predetermined amount, and in synchronization with this, the control ring 7 is
9 is rotated by a predetermined number of steps in the reverse rotation direction (that is, clockwise rotation direction).

The rotation at this time is to reversely rotate the conveying roller 14 and rotate the clutch gear 74 in the direction in which the clutch spring 77 wrapped around the boss portion (winding body portion) 76 is loosened. In this case, the paper feed shaft 52 is the recording sheet 5.
4, the initial tightening torque of the clutch spring 77 acts, the rotation of the clutch gear (transmission means) 74 is transmitted, and the spring end of the clutch spring 77 is hooked. The ring 79 rotates in the opposite direction by a predetermined number of steps.

By rotating the control ring 79 in the opposite direction, the control 0-)Ii
The lever 80 moves radially outwards of the control ring along the ramp 86 of the notch 85 of the control ring 79 and slides along the surface 87.88.

Next, the control ring 79 is rotated approximately one rotation in the forward direction.

That is, when the clutch gear 74 is rotated in the forward direction in synchronization with the rotation of the conveyance roller 14, the clutch spring 77 wound around the boss portion 76 is rotated in the direction of tightening, and the boss portion 76 and the clutch The spring 77 and the clutch drum 78 rotate integrally, and the torque is applied to the paper feed shaft 5.
2 and feeding 3 are transmitted to the 0-ra 53 and rotated in the forward direction.

At the same time, the control ring 79 engaged with one end of the clutch spring 77 is also rotated in the same direction.

Due to the rotation at this time and the biasing force of the control spring 81, the control lever 80 moves onto the surface 88 and is pushed toward the surface 87.
8.

This forward rotation drives the feeding roller 53 and starts feeding the recording sheets 1 to 54.

When the control lever 80 is rotated forward by a predetermined angle, the control lever 80 first descends to the surface 89 by the slope 93 and then guided by the surface 94 to come into contact with the surface 89. When the control lever 80 is rotated further forward, the tip of the control lever 80 comes into contact with the control ring 79. The control ring 79 is caught in the notch 85 and stops rotating.

That is, when the control lever 80 is rotated forward by a predetermined angle, the control lever 80 is first dropped onto the surface 89 by the slope 93, and then the control lever 80 is dropped onto the surface 89.
．． 89 at a predetermined angle.

Upon further rotation in the forward direction, the control lever 80 is lifted along the slope 94 and then slides along the four sides 89,90.

When it further rotates forward and rotates once, it fits into the notch 85 formed at the position where it collides and falls from the surface 89.90, and is locked in the notch 85, and the rotation of the control ring 79 is stopped. do.

By stopping the control ring 79, the one-turn spring clutch 75 is brought into the clutch-off state again.

To summarize the above movements, the initial reverse rotation of the control ring 79 (a predetermined number of pulses) triggers the paper feed to rotate the feed roller 53 once, and from there, the control ring 79 rotates once in the forward direction. In the meantime, the feed roller 53 is rotationally driven, and when the feed roller 53 and the control ring 79 have made one rotation and returned to the initial position, the control lever 80 is fitted into the notch 85 again and the clutch is off. , the feeding roller 53 stops at the reference position.

In this way, the feeding roller 53 rotates once in synchronization with the conveying roller 14, and the paper feeding operation is completed.

The number of pulses of the reversal trigger described above is determined by the fact that when the feed roller 53 rotates in the reverse direction due to the rotation of the motor for driving the conveyance roller of the recording device 10, the control lever 80 moves along the slope portion 86 of the control ring 79. In addition, the feed roller 53 should not interfere with other parts, such as the recording sheet 54, and cause adverse effects such as sheet displacement. Good to have.

According to the one-rotation spring clutch 75 described above, the feeding roller 5
Since the recording sheet 54 is controlled to rotate reliably once, in the sheet feeding standby state, the recording sheet 54 is at a position protruding in the feeding direction from the predetermined initial position, that is, the bank separation means 57
The recording device 1 is brought into a position beyond the
It is possible to prevent the required amount of feed into 0 from decreasing.

That is, even if the paper feeding is completed before the feeding roller 53 makes one revolution, the control ring 79 returns to the initial position after that due to the setting range of the equal radial surface that is pressed against the recording sheet 54.
Further, even after the rotation of the feeding roller 53 is stopped, the drive source continues to rotate in order to eject the recording sheet 54, so the rotation of the control ring 79 is insufficient and engagement with the control lever 80 becomes uncertain. That is nothing (and therefore, the control ring 79
so that it always returns to its initial position (a position where the half-moon or D-shaped cross-section notch faces the recording sheet I-54 without contacting it, and only the free rotation roller 64 is pressed against the recording sheet I-54). controlled.

Furthermore, even if misalignment or slippage occurs and a paper feeding error is about to occur, the paper can be re-feeded reliably.

Next, a detachable coupling structure between the recording device 10 and the automatic paper feed bag W50 will be described.

FIG. 14 is a rear view showing the mounting surface of the automatic paper feeder of the recording apparatus 10, FIG. 15 is a perspective view showing the mounting surface (front) of the automatic paper feeder 50, and FIG. 16 is a rear view showing the mounting surface of the automatic paper feeder 50. FIG. 5 is a horizontal cross-sectional view showing a state in which the automatic paper feeder 50 and the automatic paper feeder 50 are connected;
FIG. 17 shows a state in which the lock is released from the state shown in FIG. 16.

First, on the rear side of the recording device 10, as shown in FIGS. 14, 16, and 17, the output gear 71 that rotates in synchronization with the platen roller 14 is supported on the shaft 7, and the automatic paper feed On the mounting surface side of the device 50, as shown in FIGS. 15 to 17, there is a feeding roller 53 (
The input gear 72 capable of transmitting rotational force to the paper feed shaft 52) is supported by a shaft, and by meshing these gears 71 and 72 when coupled, the driving force of the feed roller 53 is transferred to the automatic paper feed device side. communicated.

Inside the recording device 10, there are a platen roller 14 and a sheet 1.
- A frame member 35 is provided that supports bearings such as the transport motor 34, and the case portion is attached to the frame member 35.

The automatic paper feeder 50 includes a lever 101 and a tip hook 10.
A hook member 103 having a diameter of 2 is attached to be swingable and movable by a predetermined amount in the front and rear directions, and this hook member 103 is urged inward by a tension spring 104.

On the other hand, the hook 10 of the frame member 35 of the recording device 10
2, an opening 201 through which the hook 102 enters through the opening of the case is formed, and the hook 102
is adapted to engage with the peripheral edge 8 of the opening 201. Figures 16 and 17M
As shown in FIG. 2, a bead-shaped portion is formed on the peripheral edge of the opening 201 so that engagement with the hook 102 can be smoothly performed.

When the hook 102 in FIG. 16 is engaged, the tension spring 104 is stretched (for example, 1 to 2 mm), and the automatic paper feeder 50 is pressed against and connected to the recording device 10 by the spring force.

By pinching and rotating the lever 101, the hook member 103 is unlocked as shown in FIG. 17, and the automatic paper feeder 50 can be removed from the recording apparatus 10.

The pressure contact force in this coupled state is exerted by a total of three contact surfaces.

As shown in FIGS. 14 to 16, on the automatic paper feeder 50 side, there is a first contact surface 105 that serves as a contact reference surface, and a second contact surface 105 that serves as a contact reference surface.
and third abutment surfaces 106, 107 are formed.

The contact reference surface 105 is connected to the input gear 72 as shown in the figure.
Located nearby.

A reference contact surface 202 that is a counterpart surface of this contact reference surface 105
is formed on the frame member 35 having high strength and rigidity,
Its location is chosen close to the meshing part of the gears 71,72.

Further, the hook member 103 that applies pressure contact force of the joint portion
The line of action of the three abutment surfaces 105.10 as shown
6. Considering the position of 107, the position is selected so that stable bonding can be obtained.

Note that the second and third contact surfaces 106 and 107 can also be brought into direct contact with the back surface of the recording device 10.

Further, a positioning pin 2 is provided on the mounting surface of the automatic paper feeder 50.
03.204 are formed and these bins 203.
204 is a positioning hole 2 formed on the back surface of the recording device 10.
05.206, the automatic paper feeding device 50 is positioned with respect to the recording device 10.

In addition, one hole 20 of the positioning holes 205 and 206
5 is a long hole as shown in FIG.

FIG. 18 shows the sheet stacking plate 55 and the sheet guide 6.
5, and FIG. 19 is a plan view showing line XI in FIG. 18.
It is a sectional view along X-XIX.

In FIGS. 18 and 19, a guide groove 111 is formed in a predetermined range in the paper width direction of the sheet stacking plate 55, and
An engaging portion 112 that is slidable along the guide groove 111 is formed at the lower part of the guide 65 .

As shown in FIG. 19, the first surface of the engaging portion 112 is
It forms the same surface as the upper surface of the sheet stacking plate 55, so that the stacked recording sheets 54 can be stacked on the same surface.

The front end 113 of the sea I guide 65 is connected to the feed roller 5.
3A (FIGS. 5 and 7), and therefore aligns the sheet guide 65 with the paper width.
When the feed roller 53A and the free rotation roller 64 adjacent thereto are moved, the positions of the feed roller 53A and the free rotation roller 64 adjacent thereto can be adjusted at the same time.

[Effects of the Invention] As is clear from the above description, according to the present invention, a feeding roller 1 that feeds the stacked recording sheets I, a separating means that separates the recording sheets one by one, and a recording sheet I. an automatic sheet feeding device comprising: a driving force transmission means capable of driving the feeding roller in synchronization with a conveyance roller of the device, wherein the feeding roller has a half-moon shape in cross section having a uniform radius surface and an unequal radius surface; A clutch gear using a roller and having a boss part in the driving force transmission means, a clutch spring whose one end is connected to the driven side and is mounted across the boss part and the driven side, and the clutch spring. A one-turn spring clutch is provided, which has a control ring that engages at the other end, and a control means that controls the rotation and stopping of the control ring to control on/off of the clutch for each rotation. Even in a configuration in which the feeding roller is driven using the driving force of the conveying roller of the recording device, the feeding roller drive system does not require a complicated structure such as a one-way clutch, and the stacking sheet can be easily, compactly, and inexpensively configured. To provide an automatic paper feeding bag 2 system which can reliably separate recording sheets one by one, and can further reduce resistance when pulling out recording sheets to a very low level, and can reduce noise during operation.

[Brief explanation of drawings]

Fig. 1 is a partially broken pressure surface view of an automatic paper feeder according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line - H in Fig. 1, and Fig. 3 is an automatic 4 is a plan view of FIG. 3; FIG. 5 is a vertical sectional view showing details of the feeding roller and freely rotating roller in FIG. 1; FIG. 6 is a sectional view taken along the line V+-V+ in FIG. 5, and FIG. 7 is an end view taken along the line ■-■ in FIG.
FIG. 8 is a schematic perspective view showing the recording device in FIG. 3 used in a horizontal position, FIG. 9 is a vertical sectional view showing details of the one-rotation spring clutch in FIG. 1, and FIG. 10 is a front view showing the control ring and control lever in Fig. 9, Fig. 11 is a side view taken from line XIXI in Fig. 10, and Fig. 12 is a control seen from line xn-xn in Fig. 10. FIG. 13 is a side view of the control ring seen from line xm-xm in FIG. 10, and FIG. 14 is a rear view of the automatic paper feeding device mounting surface of the recording device in FIG. 3. , FIG. 15 is a perspective view of the first automatic paper feeder seen from the surface where it is attached to the recording device, and FIG. 16 shows the locked state of the joint between the recording device and the automatic paper feeder in FIG. 3. 17 is a sectional view of the main part showing the unlocked state in FIG. 16; FIG. 18 is a plan view showing the sheet stacking plate and sheet guide of the automatic paper feeder of FIG. 1; FIG. The figure is a sectional view taken along line XI>'-XIX in FIG. 18. Below, symbols representing main components in the drawings are listed. 10--Recording device, 14-----Conveyance roller, 15
Recording head, 2 F3---1 sheet insertion slot, 34 conveyance motor, 50-automatic paper feeder, 51 frame, 52-1---
Paper picking shaft, 53 (53A, 53B) Feeding roller, 54-
Recording sheet, 55 sheet stacking plate, 56-one pressure contact spring, 57-bank separation means, 58-housing section (feeding roller)
, 63 -- flange portion, 64 free rotation roller, 65
- Seat guide, 71 output gear, 72 person key gear,
74 clutch gear, 75 rotation spring clutch, 76-
--Boss part, 7hoooooooo clutch spring, 79-
-------1 control ring, 80-----control lever (control means), 81--1--control ring, L 03-------hook member, 111 guide groove (sheet loading plate), 112--one engaging portion (seat guide).

Claims (1)

[Claims] (1) A feeding roller that feeds the stacked recording sheets;
In an automatic paper feeder comprising: a separation means for separating the recording sheets one by one; and a driving force transmission means capable of driving the feed roller in synchronization with a conveyance roller of a recording device, as the feed roller; A half-moon-shaped roller whose cross section has an equal radius surface and an uneven radius surface is used, and the driving force transmission means includes a clutch gear having a boss portion, one end of which is connected to a driven side, and the boss portion and the driven side. a clutch spring mounted across the clutch spring, a control ring that engages the other end of the clutch spring, and a control means that controls rotation and stopping of the control ring to control on/off of the clutch for each rotation. An automatic paper feeding device characterized by being provided with a one-rotation spring clutch.