JPH08217282A - Paper feeding device - Google Patents

Abstract

PURPOSE: To provide a paper feeding device capable of stably separating paper sheets, concerning to the paper feeding device for separating and feeding the stacked and held paper sheets. CONSTITUTION: A paper feeding device is provided with a tray 5 capable of being oscillated to a tray cover 4, and energized and held by a coil spring 8, a pad holder 48 capable of being oscillated to the tray cover 4, and energized and held by a coil spring 9, a pad holding member 49 capable of being slid to the pad holder 48, and energized by coil springs 51, 52, and a separating pad 50 stuck on the pad holding member 49 so as to face a paper feeding roller 66. The separating pad 50 is so constituted as to be brought in pressure-contact with the paper feeding roller 66 even if the distance between the pad holder 48 and the paper feeding roller 66 is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device, and more particularly to a sheet feeding device which separates and feeds stacked and held sheets.

[0002]

2. Description of the Related Art Generally, a printer or the like has a structure in which a plurality of printing sheets are stacked and set, and the sheets can be automatically pulled in one by one to print, and one sheet is separated from the plurality of sheets. A paper feeding device for supplying the printer to the printer is installed.

FIG. 6 shows a block diagram of a conventional example. A conventional sheet feeding device 100 is provided with a pad holder 102 which is rotatably held on a tray cover 101, a pad spring 102 is biased in a direction of an arrow F by a coil spring 103, and a separation pad 104 adhered to the pad holder 102 is coil spring. The sheet 103 is pressed against the sheet feeding roller 106 provided in the printer body 105, and the sheet 107 is separated by the rotation of the sheet feeding roller 106 and conveyed inside the printer body 105.

[0004]

However, since the separation pad 104 is directly fixed to the pad holder 102 in the conventional paper feeding device, as shown in FIG.
02 and the paper feed roller 106, the separation pad 104 separates from the paper feed roller 106 when an unnecessary gap d is generated due to the unwanted biting of the paper 107, and the paper 1
There was a problem that the separation of 07 was impossible.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a sheet feeding device capable of stably separating sheets.

[0006]

According to a first aspect of the present invention, a sheet tray for stacking and holding sheets and a sheet feeding tray for abutting the sheet and feeding the sheet are provided at an end portion of the sheet tray. And a separation pad that separates the paper from the paper tray,
In a sheet feeding device including a pad holder that holds a separation pad, the paper feed device is provided between the separation pad holder and
It is configured to have a biasing unit that biases the separation pad toward the paper feed roller.

According to a second aspect of the present invention, there is provided a separation pad holding member which is provided between the separation pad and the biasing means and holds the separation pad.

[0008]

According to the first aspect of the present invention, since the separation pad facing the paper feed roller is biased toward the paper feed roller from the pad holder that holds the edge of the paper, the pad holder and the paper feed roller are separated. The separation pad and the paper feed roller can be held in contact with each other by the urging means even if they are separated from each other due to the biting of the paper. Therefore, stable paper separation can be achieved without lowering the paper separation function of the separation pad. I can do it.

According to a second aspect of the present invention, the separation pad is held by the separation pad holding member, and the separation pad holding member is urged by the urging means to stabilize the contact between the sheet feeding roller and the separation pad. Since it can be performed, stable paper separation can be performed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a block diagram of an embodiment of the present invention. The paper feeding device 1 is held by the printer body 2 and
The printing paper 3 is supplied to. The paper feeding device 1 is opened at the front and the top, is held by a tray cover 4 and a tray cover 4 that hold the entire device so as to be swingable in the direction of arrow A, and holds a sheet 3 in a stacked state. A paper separating section 6, which is swingably held in the direction of arrow A, and which is provided at the lower end of the tray 5 so as to slightly project to the front of the tray 5 and separates the paper 3 stacked on the tray 5; It is rotatably held on both side surfaces of the tray 5 and is laid horizontally on the front portion of the tray 5 to contact the surface of the paper 3 to feed the paper to the tray 5.
The feeding roller 7 and the tray 5 are further constituted by a coil spring 8 for urging and pressing the tray 5 in the arrow A ₁ direction and a coil spring 9 for urging and pressing the sheet separating portion 6 in the substantially arrow A ₁ direction.

FIG. 2 shows a perspective view of the tray cover 4. The tray cover 4 is formed by insert molding a resin material, is formed on both side plate portions 10 and 11, and holds tray bearing portions 12 and 13 for holding the tray 5 swingably and rotatably holding the feed roller 7. A release lever 108 that is mounted on the roller bearings 14 and 15 and the tray cover 4 and that swings the tray 5, a release shaft 109 that is a rotation shaft of the release lever 108, and a swing posture holding member of the tray 5. A cam gear 111, which is composed of cam gears 110a and 110b, interlocks the release shaft 109 and the cam gear 110b, and is a retaining member for the release shaft 109, is provided.
Formed in the restriction holes 16 and 17 that restrict the swing range of the tray 5 by engaging the lower end of the tray 5 and the lower part of the front surface, the paper 3
The guide portion 18 for guiding the sheet to the supply port, the mounting portion 19 for mounting the paper separating portion 6, the positioning pins 20, 21, 23 for positioning the coil spring 8, the positioning pins 24, 25 for positioning the coil spring 9, and the tray cover 4. Mounting parts 26 to 29 for mounting to the printer body 1, rear part 3
0 toward the front side (arrow C direction) above both ends of the mounting portion 19
It is composed of separating portion bearing portions 31 and 32 which are provided so as to project and hold the sheet separating portion 6 swingably.

FIG. 3 shows a perspective view of the tray 5. Tray 5
Is attached to the tray main body 33 and the tray main body 33 so as to be slidable in the direction of arrow D, and is slid in accordance with the size of the paper 3 to guide the side edge of the paper 3.
5. The cork piece 36 is adhered to the lower end of the tray main body 33 and applies appropriate friction to the paper 3.

The tray body 33 is integrally formed by insert molding a resin material, and the bearing portions 12, 1 formed on the side plate portions 10, 11 of the tray cover 4 are integrally formed on both side upper ends.
3, swing shafts 37, 38 held by the tray cover 4 so as to be swingable, and side plate portions 10, 11 of the tray cover 4.
Regulating projections 39 and 40 for regulating the swing range by engaging with the regulation hole portions 16 and 17 formed in the edge guide 34,
Guide groove 41 that engages with 35 and guides in the direction of arrow D,
Restricting portions 42, 43, 44 for restricting the slide of the edge guides 34, 35 in the arrow D direction are formed on the lower part of the back surface,
A positioning pin 45 for positioning the other end of the coil spring 8,
It is composed of 46 and 47.

FIG. 4 is a block diagram of the paper separating section 6. The sheet separating portion 6 is engaged with the separating portion bearing portions 31 and 32 of the tray cover 4, and is engaged with the pad holder 48 and the pad holder 48 that are swingably held by the tray cover 4 so as to be movable in the arrow E direction. Pad holding member 49, pad holding member 49
The pad 50 that is bonded to the sheet 3 and generates appropriate friction between the sheet 3 and the coil spring 51 that is provided between the pad holder 48 and the pad holding member 49 and biases and presses the pad holding member 49 in the arrow E ₁ direction. , 52.

The pad holder 48 is integrally molded of a resin material by insert molding or the like, and is formed into a substantially L shape. The separating portion bearing portions 31 formed on the tray cover 4 are formed on both side ends of the upper end portion. Swing shafts 53 and 54 that engage with 32 and are swingably held by the tray cover 4, a U-shaped notch 55 for escaping from the coil spring 8, and a lower end of the sheet 3 formed on the upper surface of the lower end of the paper 3. A holding portion 56 for holding and holding the pad holding member 49 on the end surface so as to be movable in the arrow E direction.
It is composed of

A brim portion 56a for guiding the lower end of the paper 3 between the paper feed roller 66 and the separation pad 50 is formed at the tip of the holding portion 56, and the end surface of the lower portion of the brim portion 56a of the holding portion 56 is concave. The coil springs 51 and 52 are formed inside the concave portion and project in the front direction (arrow E ₁ direction).
Positioning pins 57 and 58 for positioning are formed, and restriction holes 59 and 60 for restricting the movement of the pad holding member 49 in the arrow E direction are formed on the side surface of the concave portion.

From both ends of the pad holding member 49, the pad holding member 49 is held in the pad holder 48 by engaging with the restriction hole portions 59 and 60 of the holding portion 56 in the pad holder 48 direction (arrow E ₂ direction). Engagement portions 61 and 62 for restricting movement in the arrow E direction are formed, and are provided on the back surface so as to face the positioning pins 57 and 58, and the coil springs 51 and 5 are provided.
Positioning pins 63 and 64 for positioning the other end of 2 are formed, and an adhesive portion 65 for adhering the separation pad 50 is formed on the front surface portion.

The separating pad 50 is made of a soft (rubber) resin material having a relatively large friction, and is bonded so as to slightly project from the surface of the pad holding member 49. FIG. 5 shows an operation explanatory diagram of one embodiment of the present invention. Paper 3 to printer body 2
When the sheet 3 is supplied to the tray 5, the tray 5 rotatably supported by the tray cover 4 is pressed against the pull-in roller 7 by the coil spring 8, so that the sheet 3 set between the tray 5 and the pull-in roller 7 is The rotation of the pull-in roller 7 causes the paper 3 to be pulled into the printer body 2 and conveyed. At this time, a plurality of sheets are conveyed. The conveyed plural sheets 3 are separated and conveyed into one sheet at the contact portion between the rotating sheet feeding roller 66 and the separation pad 50. The conveyed sheet 3a passes through the gap between the auxiliary roller 69 and the groove plate 68, and the leading end of the sheet abuts against the pressure contact portion between the feed roller 70 and the counter roller 71. After that, the pull-in roller 7 and the paper feed roller 66
Is stopped, and the auxiliary roller 69 and the feed roller 7 are stopped.
0 is rotated and the paper 3a is conveyed.

At this time, there is a gap a between the paper feed roller 66 and the tip of the pad holder 48, and when a plurality of sheets of paper enter the gap, the pad holder 48 is pushed down in the direction of arrow A ₂ . At this time, the pad holding member 49 can press the separation pad 50 against the paper feed roller 66 at all times by pressing the coil springs 51 and 52. 5
The value of μ (friction) between 0 and the paper is left behind due to the difference between the value of μ of the same paper and separated into one sheet.

As described above, according to the construction of the paper separating section 6 of this embodiment, the paper 3 can be reliably separated and the stable paper supply can be achieved.

[0021]

As described above, according to the first aspect of the present invention, the separation pad facing the paper feed roller is biased toward the paper feed roller from the pad holder that holds the edge of the paper. Even if the pad holder and the paper feed roller are separated due to the biting of the paper, the separation pad and the paper feed roller can be held in contact with each other by the biasing means, so that the paper separation function of the separation pad is not deteriorated. It has features such as stable paper separation.

According to a second aspect of the present invention, the separation pad is held by the separation pad holding member, and the separation pad holding member is urged by the urging means to stabilize the contact between the sheet feeding roller and the separation pad. Since it can be performed, it has features such as stable paper separation.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a perspective view of a tray cover according to an embodiment of the present invention.

FIG. 3 is a perspective view of a tray according to an embodiment of the present invention.

FIG. 4 is an exploded perspective view of a sheet separating unit according to an embodiment of the present invention.

FIG. 5 is an operation explanatory diagram of the embodiment of the present invention.

FIG. 6 is a configuration diagram of a conventional example.

FIG. 7 is a diagram for explaining a problem of a conventional example.

[Explanation of symbols]

 1 Paper Feeding Device 2 Printer Main Body 3 Paper 4 Tray Cover 5 Tray 6 Paper Separation Part 7 Drawing Roller 8,9 Coil Spring 48 Pad Holder 49 Pad Holding Part 50 Separation Pad 51,52 Coil Spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masataka Okamura 1-4-1, Fujimi-cho, Gyoda-shi, Saitama Within GEKO Co., Ltd. (72) Inventor Toru Iwasa 1-4-1, Fujimi-cho, Gyoda-shi, Saitama GEKO Within the corporation

Claims (2)

[Claims] 1. A paper tray for stacking and holding sheets of paper, and an end portion of the paper tray provided opposite to a paper feed roller for abutting the paper and supplying the paper. In a paper feeding device comprising a separation pad for separating the separation pad and a pad holder for holding the paper edge portion and holding the separation pad, the paper feeding device is provided between the separation pad and the pad holder,
A sheet feeding device comprising a biasing unit that biases the separation pad toward the sheet feeding roller. 2. The sheet feeding device according to claim 1, further comprising a separation pad holding member which is provided between the separation pad and the urging means and which holds the separation pad.