JPH09175677A - Paper feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper feeder capable of surely and easily removing the jammed paper and remaining paper at a low cost without using electric parts, improving reliability, capable of reducing the number of part items, and capable of being made compact. SOLUTION: This paper feeder is provided with paper pressing members 23, 24 concurrently having the function of curl preventing pawls preventing the curl of the transfer paper on the tip side of a side fence holding the transfer paper of a paper feed tray section 2 and a lock lever 39 engaged and turned in contact with the steps 44, 45 and the flat face 46 of a lock rail member 43 fixed to the device main body side. The paper pressing member 24 is turn by the lock lever 39, the jammed paper is pinched between the paper pressing member 34 and the flange 8 of a tray 6 in the extracting intermediate process of the paper feed tray section 2, and the jammed paper is easily extracted.

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 provided in a copying machine, a printer, or the like, and more particularly, to jam jammed paper or residual paper when pulling out a paper feeding tray portion to easily remove the jammed paper or residual paper. The present invention relates to a sheet feeding device having a mechanism.

[0002]

2. Description of the Related Art For a paper feeding mechanism such as a copying machine or a printer, a paper feeding device 1a as shown in FIG. 8 has been conventionally used. The sheet feeding device 1a is roughly divided into a sheet feeding tray section 2 having a tray 6a and the like, a sheet feeding section 3 and a conveying section 4 and the like. A frame-shaped tray 6a that is open on the upper surface side and is surrounded by a peripheral edge
Is supported so as to be able to move in and out of the apparatus body. The transfer paper 10 is held by the end fence 19a, the bottom plate 11a and a side fence (not shown) and is stored in the tray 6a. The bottom plate 11a supports the transfer paper 10 so that it can move up and down by an elevator mechanism (not shown).

[0003]

The sheet feeding section 3 is provided with the transfer sheet 1.
0 from the upper surface, a pickup roller 48 for feeding the transfer paper 10 fed by the pickup roller 48, a feed roller 49 for conveying the transfer paper 10 fed by the pickup roller 48, and a plurality of transfer papers 10 fed by the feed roller 49 in pressure contact with each other. It is composed of a reverse roller 50 and the like for classifying the sheets one by one with a predetermined torque. The pick-up roller 48 and the reverse roller 50 are movably supported so as not to get in the way when the paper feed tray unit 2 moves in and out, as indicated by a chain line. This movement is performed by a solenoid mechanism (not shown).

The transport section 4 comprises a grip roller 51, a grip driven roller 52, a vertical transport driven roller 53, etc., and transfers the transfer paper 10 via a vertical transport guide 54 to the apparatus main body 1
5, which is sent to a predetermined part. It should be noted that the vertical conveyance guide 54 and the vertical conveyance driven roller 53 are formed so as to be rotatable around a rotation point 55, as indicated by the one-dot chain line in the figure, which makes it possible to remove jammed paper and residual paper. There is.

Various types of known techniques have been adopted for a sheet feeding device in which a sheet feeding tray part is supported so as to be able to move in and out of the main body of the apparatus. For example, Japanese Patent Laid-Open No. 4-354732 has a mechanism for processing the remaining sheet. Japanese Laid-Open Patent Publication No. 3-227
No. 839 publication is cited. In the former case, in conjunction with the removal of the cassette (tray), the pressure contact between the sheet in the cassette and the paper feed roller is released to eliminate the interference with the paper feed roller and the transport member when the cassette is pulled out, and the transfer paper It is configured to prevent wrinkles and residual paper from being generated.

The latter has a mechanism for reversing the feed roller after the trailing edge of the transfer sheet sent out by the feed roller passes through the contact points of the feed roller and the reverse roller, and forcibly pulling the transfer sheet back into the tray. It is a thing. This makes it possible to remove jammed paper and remaining paper.

[0007]

In the case of the paper feeding device 1a shown in FIG. 8, when a jam such as a paper jam occurs during the operation of the device, all the transfer papers being conveyed are stopped, and the jam paper is fed by the user. However, in this case, the following problems occur depending on the positions of the jammed paper and the remaining paper. That is, when the position of the leading edge of the jammed paper or the remaining paper is at the position A or B shown in the drawing, the vertical conveyance guide 54 is rotated around the rotation point 55 to open the vertical conveyance guide 54 and the like, and the jam is generated. You can take out the paper diagonally upward.

However, if the leading edge of the jammed paper or the like is at the position C shown in the figure, the jammed paper or the like cannot be removed by the above method. Therefore, the jammed paper is removed by pulling out the paper feed tray unit 2. However, when the leading end of the jammed paper or the like is broken, the jammed paper is jammed even if the pickup roller 48 and the reverse roller 50 are released as described above. In some cases, the edge of the paper such as paper is caught in a not-shown roller hole, a notch in the guide plate, the grip roller 51, or the like, and the jammed paper cannot be pulled out. In addition, when the transfer paper is thin or has a small size such as A5 and B5, jammed paper or the like remains in the apparatus, and it may be difficult to pull it out.

On the other hand, even in the case of the above-mentioned known technique, it is difficult to remove the jammed paper or the like described in JP-A-4-354732, and the latter JP-A-3-2.
In the case of Japanese Patent No. 27839, when the transfer paper is a thin paper, the transfer paper may buckle and not be sufficiently returned to the inside of the tray, and a clutch and a motor for reversing the roller are required, and the apparatus structure Are complicated and expensive, and the reliability is lowered.

According to the present invention, instead of forcibly returning the transfer paper,
A paper holding mechanism that holds the transfer paper when pulling out the paper feed tray and can pull out the transfer paper even if the transfer paper is slightly caught is provided to ensure removal of jammed paper and residual paper. An object of the present invention is to provide a sheet feeding device that does not require electric parts, has a simple device structure and can be implemented at low cost, has a small number of parts, is compact, and can improve reliability.

[0011]

According to a first aspect of the present invention, there is provided a sheet feeding device which is a frame-like member having an opening on the upper surface side and having a bottom plate and surrounded by a peripheral edge, and which is supported by a main body of the apparatus so as to be freely inserted and removed. And a paper feed tray unit having a fence that is movably housed in the tray in the vertical and front-rear direction to hold transfer paper of various sizes, and the transfer paper in the paper feed tray unit from above. A paper feeding device, comprising: a paper feeding unit having a mechanism for feeding and separating the sheets one by one; and a feeding unit for feeding the separated one sheet of the transfer paper to a predetermined portion of the apparatus main body. A paper pressing mechanism for pressing and gripping the transfer paper protruding from the paper feeding tray is provided in the section and its vicinity, and the paper pressing mechanism is provided at least when the tray is pulled out from the apparatus main body. Press the transfer paper Characterized in that it is formed so as to.

According to another aspect of the present invention, in the paper feeding device, the paper pressing mechanism portion is provided on the immovable side of the apparatus main body near the paper feeding tray portion along the moving direction of the paper feeding tray portion. A lock rail member that forms a step along the direction,
A lock lever that is rotatably supported on the paper feed tray side and abuts on a step of the lock rail member to rotate, and is supported on the fence side to rotate in synchronization with the rotation of the lock lever. In addition, the sheet pressing member that holds the transfer sheet between the tray and the flange on the peripheral edge of the tray is provided.

According to a third aspect of the present invention, in the sheet feeding device, the sheet pressing member is brought into contact with an upper surface of transfer sheets which are held by the fence and stacked and stored in the sheet feeding tray section. The feature is that it also serves as a curl prevention claw that suppresses curl.

The present invention is based on the paper feed tray section 2 shown in FIG.
A sheet feeding device 1a having a sheet feeding section 3 and a conveying section 4 is provided with a sheet pressing mechanism section. With this paper pressing mechanism part, the transfer paper protruding from the paper feed tray part is nipped by a mechanism that mechanically moves in synchronization with the drawing operation of the paper feed tray part, and is removed as the paper feed tray part is drawn out. It As one of the concrete structures of the paper pressing mechanism, a paper pressing member that rotates by the pulling-out operation of the paper feeding tray is provided on the fence side of the paper feeding tray, and is protruded by the flange of the tray and the paper pressing member. By adopting the structure of sandwiching the transfer paper, it is possible to reliably remove the jammed paper and the residual paper with a simple mechanical mechanism. Further, the paper pressing member also serves as a curl preventing claw for suppressing the curl of the transfer paper, so that the apparatus structure can be made compact.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a sheet feeding device according to the present invention will be described below in detail with reference to the drawings. The sheet feeding device 1 of the present invention has a sheet feeding tray section 2 having substantially the same structure as that shown in FIG.
And a paper pressing mechanism 5 attached to the paper feeding section 3 and the conveying section 4, and FIGS. 1 to 3 mainly show the paper pressing mechanism 5 and the paper feed tray section 2 having the same. FIG. 4 to FIG. 7 are for explaining the method for removing jammed paper or the like according to the present invention.

First, FIG. 1 shows a sheet pressing mechanism section 5 and a sheet feeding tray section 2 having the sheet pressing mechanism section 5. The tray 6 is a frame-like member having an opening on the upper surface side, a bottom plate 7, and a peripheral edge 9 with a flange 8. A bottom plate 11 that directly supports the lower surface of the transfer paper 10 (FIG. 8) is mounted on the bottom plate 7. One end of the bottom plate 11 is pin-supported on the side edge of the tray 6, and is supported by the tray 6 rotatably around the pin. A pressure plate 12 is arranged on the lower surface side of the bottom plate 11 in contact with the bottom plate 11. The pressure plate 12 is cantilevered by a pressure shaft 13.

A pin 14 is fixed to one end of the pressure shaft 13, and a coupling 16 is fixed to the pin 14 and fixed to the stationary side of the apparatus body 15 (FIG. 8).
Engage detachably. Transfer paper 10 in the paper feed tray section 2
When the paper is fed, the transfer motor 10 is tilted by rotating the pressure shaft 13 and the bottom plate 11 via the pressure plate 12 by operating the lifting motor to feed the paper from the tray 6. It is held in a paper-ready posture.

Side fences 17 and 18 for holding both sides of the transfer paper 10 on the bottom plate 11 are provided above the bottom plate 11, and ends for holding the rear end surface of the transfer paper 10 on the bottom plate 11 of the tray 6. The fence 19 is arranged. Racks 20 and 21 are fixed to the side fences 17 and 18, respectively, and a pinion gear 22 meshes with the racks 20 and 21. By rotating this pinion gear 22, the side fences 17 and 18 move in the direction of approaching or separating,
It moves to a position corresponding to the size of the transfer paper 10. Also,
The end fence 19 is also supported on the bottom plate 11 so as to be movable in the front-rear direction by means not shown, and corresponds to the size of the transfer paper 10.

Next, the paper pressing mechanism portion 5 will be described. FIG.
Further, as shown in FIG. 3, sheet pressing members 23 and 24 are cantilevered by pins 25 and 25 at the tip ends of the side fences 17 and 18, respectively. The paper pressing members 23 and 24 are shown in FIG.
And as shown in FIG. 3, the end presser 2 which is relatively heavy
It consists of 6,27. Further, as shown in FIG. 3, the paper pressing member 24 has a bifurcated shape, and an arm member 29 for forming a tongue plate 28 on the tip side is integrally formed on the opposite side of the end pressing member 27. . In the free state, the paper pressing members 23 and 24 have the end pressing members 26 and 27 on the transfer paper 10 side.
It rotates in the direction in which it is pressed against its own weight.

That is, the paper pressing members 23 and 24 are the transfer paper 1.
It also comes into contact with and engages with the leading end of the transfer sheet 0, and also serves as a curl preventing claw for preventing the occurrence of curling of the transfer paper. In addition, as shown in FIG. 3, the lever 30 is provided at the tip of the side fence 18.
Is pivotally supported by a pin 31, one end side of the lever 30 is arranged at a position where it can abut and engage with the tongue plate 28 of the arm member 29, and the other end side is located at a position where it abuts on one pressing plate 34, which will be described later. Will be placed. An anchor portion 33 is fixed to the side fence 18, and the anchor portion 33 and the lever 30 are attached.
The one end side of the lever 30 is connected to the one end side of the arm member 2
Spring 3 for urging the tongue-shaped plate 28 of FIG.
2 is erected.

A pressing shaft 35 is pivotally supported on the lower surface of the tray 6 in a direction orthogonal to the feeding direction of the transfer paper 10. The one-side pressing plate 34 and the bevel gear 36 are fixed to the pressing shaft 35. On the other hand, a lever shaft 37 orthogonal to the pressing shaft 35 is pivotally supported on the lower surface side of the tray 6, and a bevel gear 38 meshing with the bevel gear 36 is fixed to the lever shaft 37. A lock lever 39 is rotatably supported on the lever shaft 37. The lock lever 39 is a lever-shaped member having a locking claw portion 40 at one end side, and a spring 42 is provided between the other end side and the anchor portion 41. The anchor portion 41 is fixed to the tray 6 on the base end side.

A lock rail member 43, which is orthogonal to the paper feeding direction of the transfer paper 10, is arranged near the tip of the tray 6 of the paper feed tray unit 2. As shown in FIG. 2, steps 44 and 45 are formed on the lock rail member 43. Lock lever 3
The locking claw portion 40 of 9 is abuttingly engaged with the upper surface of the lock rail member, is engaged with the steps 44 and 45 and is rotated, and the step 4
It is formed so as to come into contact with the flat surface 46 between 4 and 45 and rotate in the opposite direction.

A step 44 is formed corresponding to the storage position of the paper feed tray section 2 in the mounting body 15, and a step 45 is formed at a position corresponding to the final drawing position of the paper feed tray section 2. . In addition, the flat surface 4 between the step 44 and the step 45
The length L of 6 corresponds to the input / output length of the tray 6 of the paper feed tray unit 2. On the other hand, one pressing plate 34 of the pressing shaft 35 is formed at least by a length corresponding to a range in which the side fence 18 moves in accordance with the size of the transfer paper 10.

The constituent members of the paper feed tray unit 2 and the paper pressing mechanism unit 5 held by the paper feed tray unit 2 are put in and taken out of the main body of the apparatus as a unit. The entrance and exit is guided by the slide rail 47.

Next, the operation of the sheet feeding device 1 of the present invention will be described. The transfer paper 10 is housed between the side fences 17 and 18 and the end fence 19, and the upper surface of the tip end side thereof is held by being held by the end pressers 26 and 27 having the function of the curl prevention claws. In this state, the paper feed tray unit 2 is moved in the direction of insertion and removal (arrangement direction of the lock rail member 43), whereby the paper feed tray unit 2 is stored and pulled out.

As shown in FIG. 2, at the time of storage (when the tray 6 is set), the lock lever 39 locks the locking claw portion 40 to the step 44 and locks the paper feeding tray portion 2. In this case, the lock lever 39 rotates the lever shaft 37 in the clockwise direction. The lock lever 39 is engaged with the step 45 of the lock rail member 43 when the paper feed tray unit 2 is pulled out from the apparatus body 15, and the lever shaft 37 is rotated clockwise at the same time when the lock lever 39 is locked.

As shown in FIG. 2, in the intermediate step of shifting from the stored state to the open state, the locking claw portion 40 of the lock lever 39 contacts the flat surface 46 and the lever shaft 37 is rotated counterclockwise. It Further, as shown in FIG. 1, when the paper feed tray unit 2 is stored in the lock position, the pin 1 of the pressure shaft 13 is
4, the coupling 16 is fitted in, and the pressurizing shaft 13 is rotated by rotating an ascending motor (not shown).
Turns the bottom plate 11 and lifts the transfer paper 10 so that it can be fed.

4 and 5 show a state where the paper feed tray unit 2 is locked (when the tray is set). As shown in the figure, the upper surface of the transfer paper 10 is pressed against the pickup roller 48. As described above, since the lock lever 39 rotates clockwise, the bevel gear 38 of the lever shaft 37 rotates in that direction, and the bevel gear 36 meshing with it rotates in the counterclockwise direction. Therefore, the pressing shaft 35 and the one-side pressing plate 34 rotate counterclockwise as shown in FIG. 4, and the one-side pressing plate 34 rotates the lever 30 around the pin 31 in the clockwise direction. Therefore, the tip end side of the lever 30 is separated from the tongue plate 28 of the arm member.
In this state, as shown in FIG. 4, the end pressing member 27 of the paper pressing member 24 is positioned at a position away from the flange 8 on the peripheral edge 9 of the tray 6, and the transfer paper 10 is smoothly fed.

FIG. 6 shows the related structure between the paper pressing mechanism 5 and the jammed paper 10a when a jam occurs. In order to remove the jammed paper 10a, it is necessary to pull out the paper feed tray unit 2. Therefore, first, the bottom plate 11 is lowered, the transfer paper 10 is lowered as shown, and only the jammed paper 10a is left. As shown in FIG. 7, during the withdrawal of the paper feed tray unit 2, the lever shaft 37 rotates counterclockwise as described above. Therefore, the pressing shaft 35 rotates clockwise.

As a result, the lever 30 is pulled by the spring force of the spring 32 and presses the tongue 28. Therefore, the paper pressing member 23 rotates clockwise, the end presser 27 is pressed toward the flange 8 side, and the jammed paper 10 a is sandwiched between the flange 8 and the end presser 27. Of course, in this case, the pickup roller 48 and the feed roller 49
Moves backward to the position indicated by the solid line in FIG. 6 and moves away from the jammed paper 10a. As described above, when the paper feed tray unit 2 is moved in the pull-out direction, the jammed paper 10a is pulled out in the sandwiched state and can be completely removed.

In the above description, the paper pressing mechanism has the above-mentioned structure, but other mechanism having a structure capable of holding the jammed paper 10a in synchronization with the operation of pulling out the paper feed tray 2 is naturally applied. It Further, although the tongue plate 28 and the like are provided only on the paper pressing member 24 on one side in the above description, they may be provided on the paper pressing member 23 side. Further, although the present embodiment has been described with respect to the central reference paper feeding device, it is similarly applied to the end face reference device. Further, the present invention is applicable to all front-feeding type paper feed trays.

[0032]

According to the paper feeding device of the first aspect, the jammed paper or the remaining paper that has jumped out of the tray is pinched by the tray when the tray is pulled out, so that even thin transfer paper can be easily handled. You can take it out. Further, the transfer paper is sent to the main body of the apparatus one by one by the paper feed unit and the transport unit.

According to the paper feeding device of the second aspect, the paper pressing mechanism portion of the present invention has a mechanical structure and can be implemented at a low cost without using electric parts or its control means, thereby improving reliability. Can be achieved. In addition, since the lock lever holds the paper feed tray at a predetermined position when the paper feed tray is set or opened, the transfer paper is less likely to be displaced even when the paper feed tray is set and pulled out vigorously.

According to the paper feeding device of the third aspect of the present invention, since the curl preventing claw and the paper pressing member are combined,
The number of all components is reduced, and it is compactly assembled.
Reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a detailed structure around a paper feed tray unit and a paper pressing mechanism unit of the present invention.

FIG. 2 is a schematic diagram showing a state in which a lock rail member and a lock lever of the present invention are engaged with each other when a tray is set, pulled out, and in an intermediate step.

FIG. 3 is a partial perspective view showing a detailed structure of a paper pressing mechanism portion of the present invention.

FIG. 4 is a partial side view showing an engaged state of a paper pressing mechanism portion and a transfer paper at the time of paper feeding of the present invention.

FIG. 5 is a schematic diagram showing an engagement state of a lock rail portion and a lock lever when setting or pulling out a paper feed tray portion.

FIG. 6 is a partial side view showing an engaged state of a sheet pressing mechanism section and a transfer sheet in an intermediate step of pulling out a sheet feeding tray section.

FIG. 7 is a schematic diagram showing an engagement state of a lock rail portion and a lock lever in an intermediate drawing process.

FIG. 8 is a side view showing a schematic structure of a paper feed tray unit, a paper feed unit, and a conveyance unit in a conventional paper feed device.

[Explanation of symbols]

 1 Paper Feeding Device 2 Paper Feeding Tray Part 3 Paper Feeding Part 4 Conveying Part 5 Paper Holding Mechanism Part 6 Tray 7 Bottom Plate 8 Flange 9 Edge 10 Transfer Paper 10a Jam Paper 11 Bottom Plate 12 Pressure Plate 13 Pressure Shaft 14 Pins 15 Device Main Body 16 Coupling 17 Side fence 18 Side fence 19 End fence 20 Rack 21 Rack 22 Pinion gear 23 Paper pressing member 24 Paper pressing member 25 Pin 26 End pressing 27 End pressing 28 Tongue plate 29 Arm member 30 Lever 31 pin 32 Spring 33 Anchor Part 34 One-side pressing plate 35 Presser shaft 36 Bevel gear 37 Lever shaft 38 Bevel gear 39 Lock lever 40 Locking claw 41 Anchor 42 Spring 43 Lock rail member 44 Step 45 Step 46 Flat surface 47 Slide rail 48 Pickup roller 49 Idorora 50 reverse roller 51 grip roller 52 clip follower roller 53 vertical transport driven roller 54 vertical conveying guide 55 pivot point

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location G03G 15/00 516 G03G 15/00 516

Claims (3)

[Claims] 1. A tray, which is formed of a frame-like member having an opening on the upper surface side and a bottom plate and is surrounded by a peripheral edge, and which is supported in and out of the apparatus main body, and the tray for holding transfer sheets of various sizes. A sheet feeding tray section having a fence that is movably stored in the vertical and front-rear direction, and a sheet feeding section having a mechanism for feeding the transfer sheets in the sheet feeding tray section from the upper surface and separating the sheets one by one. A sheet feeding device including a conveying unit that feeds the separated one sheet of transfer paper to a predetermined portion of the apparatus main body, and the sheet feeding tray unit and the vicinity thereof protrude from the sheet feeding tray unit. A paper pressing mechanism for pressing and holding the transfer paper is provided, and the paper pressing mechanism is formed to press and hold the transfer paper at least when the tray is pulled out from the apparatus main body. Paper feeding device. 2. A lock, wherein the paper pressing mechanism portion is provided on the immovable side of the apparatus main body near the paper feeding tray portion along the moving direction of the paper feeding tray portion and forms a step along the moving direction. A rail member, a lock lever rotatably supported on the side of the paper feed tray, and abutting on a step of the lock rail member to rotate, and the fence side to rotate in synchronization with the rotation of the lock lever. The sheet feeding device according to claim 1, further comprising: a sheet pressing member that is supported by the sheet holding member and holds the transfer sheet between the sheet holding member and the flange on the peripheral edge of the tray. 3. The paper pressing member also serves as a curl preventing claw that holds the transfer paper held by the fence and abuts against the upper surface of the transfer paper stacked and stored in the paper feed tray portion to suppress curling of the transfer paper. The sheet feeding device according to claim 2, wherein the sheet feeding device is a sheet feeding device.