JPH0730603Y2 - Paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a paper feeding device that can be used in a recording device such as a copying machine or a printer.

(B) Conventional Technology As a conventional paper feeding device, for example, as shown in Japanese Patent Publication No. Sho 55-24110, a pair of rollers having concave and convex portions are arranged side by side, and a sheet is placed on the concave and convex portion. However, a paper guide is not provided in this paper feeding device.

In addition, another paper feeding device for transferring paper in a wavy shape is disclosed in
As shown in Japanese Patent Publication No. 29352, this paper feeding device also has no paper guide between the rollers.

(C) Problems to be Solved by the Invention In the conventional paper feeding device, since the paper guide is not provided between the pair of rollers, the paper may skew.

Further, since the paper is forcibly sandwiched by the pair of rollers and formed in a wavy shape, the paper is deformed in a slightly wavy shape, and if the paper is fed to the image forming unit in such a state, the written image is not accurately transferred to the paper. Challenges arise.

(D) Means for Solving the Problem The present invention is directed to a paper processing device for processing a paper to be fed, which is disposed above the paper processing device, and which is parallel to the plane of the paper to be fed and in the paper feeding direction. In a paper feeding device in which a plurality of rollers are respectively mounted on a pair of rotating shafts extending in a direction substantially orthogonal to each other, a pair of rollers of the plurality of rollers are disposed below with a feeding portion sandwiched therebetween. First and second sheet storage sections, a delivery member for individually delivering the sheets stored in the first and second sheet storage sections to the roller pair, and the roller non-roller of the rotating shaft. A paper guide provided between the mounting portions, and the paper delivered from the first paper storage portion abuts one main surface of the paper guide and is guided to the roller pair, and the paper is the roller. Coupled with paired transportation, it will not be deformed in a wave shape during that period. The sheet sent from the second sheet storage section is guided to the roller pair by contacting with the other main surface of the paper guide, and the sheet is guided by the roller pair. Along with the conveyance, the sheet is guided to the upper sheet processing apparatus while being deformed in a wave shape during the period.

(E) Action As described above, one main surface of the paper guide is in contact with the paper from the first storage portion and is guided by the roller pair, and the other main surface is the paper from the second storage portion. It abuts and is guided to the roller pair.

Then, the paper fed along one main surface or the other main surface of the paper guide is guided while being deformed into a wave shape during the period according to the pair of rollers and being conveyed. During the period of deformation, the user becomes moderately stiff and is fed to the sheet processing apparatus arranged above without skewing or bending.

(F) Embodiment Hereinafter, the present invention will be specifically described with reference to the drawings showing an embodiment thereof. FIG. 1 is a left side external perspective view showing a state in which a paper feeding stand according to the present invention is installed in a copying machine, and FIG. 2 is a schematic vertical sectional view showing an internal mechanism thereof. The operation of the copying machine 2 placed on the paper feeding stand 1 is as follows. First, the original set on the platen glass 27 constituting the original placing table is exposed by the exposure lamp 8 and is integrated with the first. The developed image is scanned by the 1-scanning mirror 9 and the second and third scanning mirrors 10 and 11 which move in the arrow a direction, that is, the rightward direction of the copying machine 2 together with the 1-scanning mirror 9. This scanning light passes through the lens 12 and the fourth
Arrow b through the main motor (not shown) via the mirror 13
Reaches the surface of the photosensitive drum 7 rotating in the direction. The photosensitive drum 7 is precharged by the static elimination lamp 14, and is uniformly charged by the charging device 15 provided at the position on the photosensitive drum rotation direction side. The electrostatic latent image is formed by the above-mentioned image exposure. It is formed.

Next, the electrostatic latent image is developed by the developing device 16 provided at the position on the photosensitive drum rotation direction side of the charging device 15 to be visualized with toner, and is provided at the position on the photosensitive drum rotation direction side of the developing device 16. The toner image is transferred to the sheet conveyed from the pair of registration rollers 30 by the transfer device 17 provided below the photosensitive drum 6, that is, on the position of the registration roller 30 on the photosensitive drum rotation direction side.

A separating device is provided at a position on the photosensitive drum rotation direction side of the transfer device 17.
18 is provided, and the paper on which the toner image is transferred is separated from the photosensitive drum 7, and is conveyed to the fixing device 20 by the conveyor belt 19. A cleaning device 25 is provided at a position on the photosensitive drum rotation side of the separating device 18, and a cleaning blade is provided.
At 26, the toner remaining on the surface of the photosensitive drum 7 is peeled off,
to clean.

The toner image on the paper sent to the fixing device 20 is fused and fixed by the heating roller 21 and the pressure roller 22, and a pair of paper discharge rollers is provided.
At 23, the paper is discharged onto the paper discharge tray 24.

Paper cassettes 3 and 4 are detachably mounted on the right side of the copying machine 2, and the paper loaded in each cassette is sent out by a paper feed roller 28 or 29 equipped in each cassette, and the above-mentioned registration is performed. It comes into contact with the roller 30 and is temporarily stopped. After that, as described above, the sheet is driven by the registration roller 30 at the same timing as the leading edge position of the toner image formed on the photosensitive drum 7, and the photosensitive drum 7 is driven.
And the transfer device 17. Registration roller 30
A paper transport path to and from the paper cassettes 3 and 4 is formed at the bottom of the copying machine 2 separately from
Horizontal hole-shaped paper feed port with a width that allows the maximum width of paper to pass
It is also configured between plate-shaped paper guides 50 and 51 which are erected from both sides of 52. The end of these conveying paths, that is, the position immediately before the registration roller 30, and the paper feed port
For example, photoelectric sensors 53 and 54 for detecting the conveyance of the paper are provided at intermediate positions of the conveyance path formed by 52 to the paper guides 50 and 51, respectively.

FIG. 3 is a vertical cross-sectional view showing the internal structure of the paper feed tray, FIG. 4 is a left exploded perspective view showing the configuration, and FIG. 5 is a right external perspective view showing the released state. The paper tray 1 is a copying machine 2
It has a rectangular parallelepiped-shaped pedestal body 100 having an upper surface having substantially the same size as the bottom portion of the pedestal. The upper cover 60 having the side wall is supported by these.

Then, on the front end and the rear end side of the upper surface of the upper cover 60, prism-shaped support bodies 71, 71 whose length directions are aligned in the left-right direction of the gantry body 100 are provided, and a copying machine is provided on the support bodies 71, 71. 2 is placed. Further, on the lower surface of the bottom plate 48, support members 76, 76 similar to the support member 71 are provided so as to face the support members 71, 71 via the gantry body 100, respectively.
That is, in the copying machine 2, the load is transmitted to the upper supporting members 71, 71, and the lower supporting members are passed through the columns 72, 73 and 74, 75, respectively.
Supported by being transmitted to 76,76.

The gantry body 100 is provided with two paper feed mechanisms, one of which is a right side cassette part for mounting a part of the paper cassette 5 on the right side of the gantry body 100 like the copying machine 2 in a protruding state.
In the right cassette portion 34, a side wall 36 having a mounting opening for the paper cassette 5 also serves as a detachable right side wall of the gantry body 100, and a sliding member provided under the right cassette portion 34.
63, 63 are provided on the lower surface of the bottom plate 48 so that the right side cassette portion 34 can be pulled out to the right side of the gantry body 100, and a handle 37 therefor is provided at the end of the side wall 36 on the front side of the gantry body 100. It is provided. The other side of the paper feeding mechanism is a left side cassette portion 35 for accommodating the paper cassette 6 inside the gantry body 100, and the left side cassette portion 35 has a supporting plate 47 which is one size smaller than the bottom plate 48 at the lower part thereof. By providing the sliding members 40, 40 between the lower surface of the support plate 47 and the upper surface of the bottom plate 48, the support plate 47 in a state where the front cover 38 of the gantry body 100 is pulled down to the front side and opened, that is, The left cassette portion 35 is constructed so that it can be pulled out to the front side, and a handle 39 for this is provided at the upper end portion of the support plate 47. As described above, the left side cassette unit 35 can store the entire unit including the sheet cassette 6 in the gantry main body 100, so that the surrounding work space is not narrowed.

A U-shaped notch 47a is provided at an end of the support plate 47 on the rear side of the gantry body 100, and the notch 47a connects the support plate 47 to the gantry body.
Pin 4 protruding from the bottom plate 48 when inserted into 100
When the left cassette portion 35 is fitted, the positioning is performed when the left cassette portion 35 is fitted. Part of the peripheral surface of the pin 49 is tapered from the tip end side and the base end side, respectively,
This portion is adapted to fit in the cutout portion 47a.
That is, even when the support plate 47 is inserted in a state in which it is slightly displaced in the vertical direction, the notch 47a is fitted to the reduced diameter portion of the pin 49 along the inclined surface of the pin 49, so that the support plate 47 moves vertically. The positions in the left-right direction and the insertion direction are determined. The right side cassette part 34 is easily integrated with the right side wall of the gantry body 100 so that positioning at the time of loading is easy, but the same configuration as the left side cassette part 35 may be adopted.

As shown in FIG. 3, each of these cassette parts is provided with a cassette guide 4 which supports both side ends of the paper cassette.
A sheet cassette common to the copying machine 2 is mounted by 5 or 46 to feed the sheet. Each cassette unit has a paper feed roller and a paper guide, and a paper feed roller 32 and paper guides 41 and 42 are provided near the left end of the cassette 5 loaded in the right cassette unit 34. In addition, the left cassette part that opposes these by separating them for a suitable length
A paper feed roller 31 and paper guides 43, 44 are provided near the right end of the cassette 6 of 35. Each paper feed roller 31 and 3
Reference numeral 2 designates these rotation axes in parallel with the rotation axis of the registration roller 30. Each of these paper guides is extended so as to approach the upper part between the cassettes 5 and 6, and a pair of intermediate rollers 33 are connected to the rotary shafts of the paper feed rollers 31 and 32 in this portion. And are located in parallel with each other and are provided on the right side cassette portion 34. A sensor 55 similar to the sensor 53 is provided below one of the intermediate rollers 33 near the cassette 5.

FIG. 6 is a plan view around the intermediate roller 33 on the upper surface of the gantry body 100, which is the main part of the present invention. A rectangular notch is formed on the right end of the upper cover 60 of the gantry body 100. ,
The upper portion of the right side cassette portion 34 is configured to fit into this cutout portion, and an intermediate upper cover 59 is disposed so as to be exposed at the left end side (upper end side in FIG. 6) of the right side cassette portion 34. They are arranged substantially flush with each other, and these are also arranged substantially flush with the upper cover 60 of the gantry body 100. The intermediate roller 33 is composed of a plurality of roller pairs.
33a and 33b are provided with a proper distance from each other in the axial direction.
It is suitable that the distance between the roller pairs is 1-2 mm. A plurality of notches are formed between the rotating shafts 33a and 33b of the roller pairs so that the upper end of the paper guide 41 provided on the center side of the gantry body 100 of the right cassette portion 34 does not contact the roller pairs. The center of the plate thickness is aligned with the centers of the rotating shafts 33a and 33b so as to face the rotating shafts in parallel, and the upper end of the paper guide 41 is substantially flush with the upper peripheral surface of the intermediate roller 33. It is located at It is suitable that the paper guide 41 has a thickness of 2 to 3 mm. Then, the intermediate roller 33
It is made to face directly below the paper feed port 52 at the bottom of the copying machine 2.

Further, the rotating shaft 33b may be biased in the direction of the rotating shaft 33a by the elastic member, so that one roller of the intermediate rollers 33, 33 may be appropriately pressed against the other roller.

The sheets fed from the left and right cassette units need to be conveyed to a predetermined position without shifting in the lateral direction of the photosensitive drum 7. For this purpose, the sheet feeding roller axial direction of the sheet feeding unit of each cassette unit is set. The adjustment of the mounting position in is performed as follows. First, as for the right side cassette portion 34, as shown in FIG. 4, when the bottom plate 66 of the chassis 65 including the intermediate roller 33, the paper feed roller 32, etc. is attached to the support plate 64 to which the sliding member 63 is fixed by screws. By providing the bottom plate 66 with the long hole 66a having an adjustment width in the axial direction of each roller, the roller can be fixed after the position adjustment in the axial direction of the roller. On the other hand, for the left cassette portion 35, in addition to the adjustment in the axial direction of the photosensitive drum 7, it is necessary to adjust the parallelism of the right cassette portion 34 with respect to the intermediate roller 33. FIG. 7 shows a chassis including the paper feed roller 31 of the left cassette portion 35.
67 is a perspective view of the left side of the support plate 47 and the support plate 47, the bottom plate 68 to which the chassis 67 is fixed, the long hole 70 having the adjustment width in the axial length direction of the paper feed roller 31 and the direction orthogonal thereto at the four corners thereof.
b is provided at four positions, and an elongated hole 70a having an adjustment width in the axial direction of the paper feed roller 31 is also provided at the central position. The bottom plate 68 including the chassis 67 is adapted to be screwed to the right side portion of the support plate 47 using the elongated hole 70b, and the right side portion of the support plate 47 is provided with a screw hole 47b therefor.
Are provided at four positions corresponding to the central positions of the long holes 70b. A pin 69 that fits into the elongated hole 70b of the bottom plate 68 is provided at the central position of these screw holes 47b. The diameter of the pin 69 is substantially equal to the width of the elongated hole 70b in the direction orthogonal to the axial direction of the paper feed roller 31. Now, in order to positionally adjust and attach the bottom plate 68 to the support plate 47, first, the elongated hole 70b of the bottom plate 68 and the screw hole 47b of the support plate 47 are temporarily fixed using screws. Then, the copying operation of the copying machine 2 is performed, and here, the left side cassette portion 35
If there is no deviation of the paper fed from the photosensitive drum 7 in the axial direction, the process proceeds to the adjustment of the parallelism with the intermediate roller 33. If there is a deviation, loosen the screw to attach the bottom plate 68 to the photosensitive drum 7. The position is adjusted by moving along the long hole 70b in the axial direction of. To adjust the parallelism with the intermediate roller 33, the screw is loosened and the bottom plate 68 is rotated about the pin 69 fitted in the elongated hole 70b of the bottom plate 68 so as to be parallel to the intermediate roller 33. Since the pin 69 has a diameter substantially equal to the width of the elongated hole 70a in the direction orthogonal to the axial direction of the paper feed roller 31 as described above, the bottom plate 68, that is, the paper feed mechanism Only the parallelism with the intermediate roller 33 can be adjusted without shifting in a direction orthogonal to the axial direction of 31.

In the paper feed tray 1 configured as described above, first, the paper feed cassette to be used by the copying machine 2 is selected.
When the cassette 5 is selected, the paper loaded in the cassette 5 is carried out by the driving of the paper feed roller 32 at the start of copying, and is conveyed between the paper guides 41 and 42.
When the cassette 6 is selected, the paper feed roller is also used.
The sheet is conveyed between the paper guides 43 and 44 by driving 31. Then, the sheet sent out from any of the cassettes reaches the intermediate roller 33 which is rotated in the direction of conveying the sheet to the copying machine 2 side.

The sheet passing between the intermediate rollers 33 is formed on the sheet by the paper guide 41 which is partially located between the rotation shafts 33a and 33b between the roller pairs of the intermediate rollers 33 as described above. The direction orthogonal to the transport direction of is formed in a wave shape (FIG. 6). As a result, the sheet exiting from the intermediate roller 33 and heading into the copying machine 2 becomes stiff and easily reaches the registration roller 30. The sheet conveyed to the registration roller 30 comes into contact with the surface of the photosensitive drum 7 as described above, and the toner image is transferred.

When the paper is stopped between the intermediate roller 33 and the registration roller 30, that is, when the paper is jammed, the above-mentioned three sensors are used.
The presence / absence of paper in each detection area is detected by 53, 54, and 55. If only the sensor 53 detects the sheet, it means that the sheet has already been ejected from the intermediate roller 33 and is sandwiched by the registration rollers 30, and the paper jam position of the copying machine 2 is near the registration rollers 30. Display that there is.

On the other hand, when the sensors 53 and 54, all the sensors, or the sensors 54 and 55 detect the paper, the intermediate roller 33 is rotated in the reverse direction, and the stopped paper is pulled back from the copying machine 2 to the paper feed tray 1 side. I do. This operation may be restricted by time or distance. Next, after the intermediate roller 33 is rotated in the reverse direction, all the sensors detect the paper again. If the sensor 53 detects the sheet here, it means that the sheet is sandwiched by the registration rollers 30 and cannot be removed even if the intermediate roller 33 is rotated in the reverse direction. It is displayed that it is near. Based on this display, the operator pulls the front cover 56 of the copying machine 2 forward to open it, and rotates the registration roller 30 to remove the jammed paper.

On the other hand, if the sensor 53 does not detect the sheet, it means that the sheet is not sandwiched by the registration rollers 30 but by the intermediate roller 33, and an instruction to pull out the right side cassette unit 34 is displayed on the copying machine 2. Let FIG. 8 and FIG. 9 are vertical sectional views showing the pulled-out state of the right side cassette portion 34. The sheet 57 in FIG. 8 is fed from the right side cassette section 34, and the sheet 58 in FIG. 9 is fed from the left side cassette section 35. As described above, since the intermediate roller 33 is provided in the right side cassette part 34, the right side cassette part 34 is pulled out to be exposed and removed to the outside of the gantry body 100, and the sheet fed from the left side cassette part 35 is also removed. Since 58 is also sandwiched by the intermediate roller 33, it can be easily removed from the intermediate roller 33 like the paper 57 fed from the right side cassette portion 34. In addition, the upper cover 59 of the right cassette portion 34 is separated from the upper cover 60 of the gantry body 100 as described above, and the right cassette portion 34 is pulled out so that it is located below the paper feed port 52 of the copying machine 2. Since the space is formed, even if the sheet is not pinched by the intermediate roller 33 and remains near the sheet feeding port 52, the sheet can be easily removed from the right side of the gantry body 100 as shown in FIG. Further, the upper cover 59 of the right cassette portion 34 prevents parts such as the paper feed roller 32 from being exposed to the outside when the right cassette portion 34 is pulled out.

Now, in the case where a paper jam occurs in this way, the paper is removed after the right side cassette unit 34 is pulled out as described above, but the paper is jammed due to being fed from the left side cassette unit 35, When the left cassette portion 35 is first pulled out after the intermediate roller 33 is rotated in the reverse direction, the paper that is in a state of straddling the inside of the copying machine 2 and the inside of the left cassette portion 35 is conveyed on the paper. The paper is damaged because it is pulled out in the direction orthogonal to the direction. The 10th means to prevent this
The members shown in the figure are provided. FIG. 10 is a plan view showing a mounting state of the hook member 61 and the projecting member 62 provided in the vicinity of each end of the front cover 38 of the gantry body 100 and the side wall 36 of the right side cassette portion 34, and FIG. FIG. 11 is a view taken along line XI-XI in FIG. The hook member 61 has a U shape, and the left end of the U shape is wound like a spring around a shaft 61a provided on the back surface of the front cover 38 with its length direction aligned with the height direction of the front cover 38. By this drag force, the upper and lower side portions of the U-shape are configured to stand substantially vertically with respect to the back surface of the front cover 38. The protruding member 62 is provided on the back surface of the side wall 36 and has a rectangular portion that fits within the U-shape of the hook member 61, and the tip end portion of this protruding portion has an inclined portion 62a having a pointed side that is isolated from the front cover 38. Has been formed.

In the hook member 61 and the projecting member 62 configured as described above, when the right side cassette portion 34 is housed in the gantry body 100 and the front cover 38 is in the closed state, as shown in FIGS. 10 and 11. As shown in the drawing, the projection member 62 is fitted in the hook member 61, and it is impossible to pull down the front cover 38 to the front side of the front cover 38 to open it, and it is necessary to first pull out the side wall 36, that is, the right side cassette portion 34. is there. This allows the gantry body
It is impossible to pull out the left side cassette section 35 stored in 100 first, and the sheets fed from the left side cassette section 35, jammed, and pulled back by the intermediate roller 33 are returned to the right side cassette section 34 first. It will not be damaged because it is removed as described above by being pulled out. Further, the hook member 61 and the projection member 62 are not hindered when the pulled-out right side cassette portion 34 and the opened front cover 38 are housed or closed in the gantry body 100, respectively. Without returning to the original state. That is, when the front cover 38 is closed first, the right side cassette portion 34
When the projection member 62 is inserted into the hook member 61 in the opposite direction from the time of pulling out by sliding to store the right cassette portion 34 and the right side cassette portion 34 is first stored, the operation explanatory view of FIG. When the front cover 38 is closed as shown in the order of abc, the left side portion of the U-shaped hook member 61 is protruding member 62.
The shaft 61a rotates leftward in the figure along the inclined portion 62a against the spring, and is fitted onto the projecting member 62 with the front cover 38 closed.

(G) Effect of the Invention In the present invention, since the paper guide is inserted between the pair of rollers, the paper does not skew.

Further, since the sheet is not strongly formed in the wavy shape, the sheet is not deformed in the wavy shape and the transfer failure does not occur.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and FIG. 1 is a perspective view of a left side appearance showing a state in which the apparatus of the present invention is installed in a copying machine,
FIG. 2 is a schematic longitudinal sectional view showing the internal structure of the same, FIG.
FIG. 4 is a vertical cross-sectional view of the device of the present invention, FIG. 4 is an exploded perspective view of the left side of the device, FIG. 5 is a perspective view of the right side of the device in an open state, and FIG. FIG. 7 is a left side external perspective view showing the configuration of the left side cassette part, FIGS. 8 and 9 are vertical sectional views showing the right side cassette part in a pulled-out state, and FIG. Fig. 10
FIG. 12 is a view for explaining the operation, taken along the line XI-XI. 1 ... Feeding stand, 2 ... Copying machine, 5, 6 ... Paper cassette, 31, 32
... Paper feed roller, 30 ... Registration roller, 33 ... Intermediate roller,
33a, 33b ... Rotating shaft, 34 ... Right side cassette part, 35 ... Left side cassette part, 40, 63 ... Sliding member, 41 ... Paper guide, 100 ...
The gantry body.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Jiro Miyazaki, 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (56) Reference JP-A-52-79998 (JP, A) JP-A-55 -61548 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A sheet processing device for processing a fed sheet is arranged above and extends in a direction parallel to the plane of the fed sheet and substantially orthogonal to the sheet feeding direction. In a paper feeding device in which a plurality of rollers are respectively mounted on a pair of existing rotating shafts, first and second rollers arranged below each feeding pair of rollers of the plurality of rollers. A sheet storage unit, a delivery member for individually delivering the sheets stored in the first and second sheet storage units to the roller pair, and a paper guide provided between the roller non-attachment unit of the rotation shaft. The sheet sent out from the first sheet storage section abuts on one main surface of the paper guide and is guided to the roller pair, and the sheet is conveyed by the roller pair during that period, While deforming into a wavy shape, the upper paper processing device The sheet sent out from the second sheet storage section comes into contact with the other main surface of the paper guide and is guided to the roller pair, and the sheet is wavy during that period in combination with the conveyance by the roller pair. The sheet feeding device, wherein the sheet feeding device is guided to the upper sheet processing device while being transformed into the sheet feeding device.