JPH0761628A - Paper feeding and carrying device - Google Patents

Abstract

PURPOSE:To prevent the oblique feed of a paper sheet and obtain a copy image of high quality by providing a load application means at a position off a feed roller over the predetermined distance toward an upstream direction, and off a sheet reference point with one end of the sheet taken as reference for applying a load to the upper surface thereof in contact state. CONSTITUTION:A plate type weight 29 strengthens the flexibility of a thin film sheet 30, and has such length as prohibiting the turning motion thereof between a paper guide (upper) 10 and a paper guide (lower) 11. The weight 29 is pasted to the sheet 30 with a pressure sensitive adhesive, while one end of the sheet 30 is pasted and fixed to the paper guide (upper) 10 with a pressure sensitive adhesive, thereby holding the weight 29. In this case, a gap between the end of the weight 29 and the curled section of the sheet 30 is formed to be minimum possible for allowing the smooth vertical travel of the weight 29. According to this construction, the weight 29 can be prevented from being pulled outside, when a sheet is drawn out at the time of the occurrence of a jam.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding / conveying device of a copying machine, for example, which can feed and convey various kinds of paper.

[0002]

2. Description of the Related Art It is possible to feed various types of paper,
For example, in a sheet feeding device of a copying machine, a sheet stacking device capable of stacking a plurality of sheets of paper is provided with a movable guide mechanism for guiding one side of the sheet to the other side in accordance with the sheet width, For example, in order to feed even narrow paper such as business cards, it is necessary to press the paper feed roller provided at a position closer to the reference side of the paper and the paper feed roller so as to separate the paper one by one. A sheet separating mechanism that is held, a conveying unit that pulls out a sheet from the sheet feeding roller unit by a conveying roller that is provided on the downstream side of the sheet feeding roller, and a driving force of the sheet feeding roller when the sheet is pulled out by the conveying unit. Is controlled to be cut off, and the paper feed roller has a structure capable of being driven and rotated by frictional resistance when the paper is conveyed. A paper transport method by the paper transport device will be described below. The sheet will be referred to as a "sheet" hereinafter.

FIG. 7 is a cross-sectional view of the sheet feeding and conveying section of the copying machine. FIG. 8 is a plan layout view of each paper feed roller.

In FIG. 7, the required amount of sheets 13 is manually set in the sheet stacking device 12, and a copy start signal generated by pressing a copy button or the like causes the manual feed roller 7 to rotate while being driven by a drive mechanism (not shown). Only the uppermost one of the sheets 13 set down in the sheet stacking device 12 is conveyed to the manual sheet feeding roller 6 side which rotates in conjunction with the manual sheet feeding roller 7. The manual feed-in roller 7 is a sheet 13
It is designed to rise when the tip begins to pass through the manual feed roller 6 section. Below the manual paper feed roller 6, there is a masatsu plate 9 which is pressed against the surface of the manual paper feed roller 6 by a spring 8 so as to come into contact with the surface of the manual paper feed roller 6. Is a sheet separating unit that conveys only one sheet when a plurality of sheets are fed from the sheet stacking device 12. Sheet 13 by manual paper feed roller 6
Is sent to the paper feed roller 51 and the PS of the sheet locking portion is
Reach plate 53. When the sheet 13 has reached the PS plate 53, the sheet detection unit 50 such as a reed switch determines that the sheet 13 has a certain amount of deflection, and then the clutch 70 drives the manual feed roller 6 after driving. It is controlled to stop. The reason why the sheet 13 is temporarily stopped by the PS plate 53 is to synchronize with the leading edge of the image on the drum. When the warp time comes, the PS plate 53 is raised by a drive mechanism (not shown), and the sheet 13 is fed by the paper feed roller B51.
Are transported again. At this time, the manual sheet feeding roller 6 is still stopped, and the masatsu plate 9 is also in pressure contact with the sheet 13 to be conveyed so as to apply a load. As shown in FIG. 8, this manual paper feed roller 6 is
It is arranged at a position close to the sheet reference side so that a narrow sheet can be fed.

Further, as a publicly known material, JP-A-2-7063
These include 0. These have a rotation axis that is substantially parallel to the rotation axis of the paper feed roller on the top lid of the paper cassette, and a paper bending prevention roller that comes into contact with the top surface of the paper and is driven to rotate by the movement of the paper is provided. It is characterized by that.

[0006]

As described above, after the sheet 13 is fed by the manual feed roller, the sheet conveying operation is temporarily stopped at the sheet leading edge aligning portion, and the image on the photoreceptor and the sheet are The mechanism is so controlled that the rotation drive of the previous manual paper feed roller 6 is cut off when the sheet conveyance is started again by the paper feed roller B51 so that the front ends are aligned. At this time, the sheet is subject to the manual feed roller 6, the pressure contact force of the sheet separating mechanism that is in pressure contact with the manual feed roller 6, and the load when the manual feed roller 6 is driven to rotate. Become. When the sheet 13 is further conveyed in this state, a moment is generated in the sheet 13, so that the sheet 13 is conveyed straight, not straight. This skew feed continues until the sheet 13 passes through the manual feed roller 6, and the image on the photoconductor appears diagonally on the sheet (actually, the sheet is skewed). Can no longer be provided. Also, a roller is attached to the upper lid of the cassette.
In the case of, it is difficult to keep the roller parallel to the paper feeding roller with high accuracy, and there is a concern that the roller may be slightly inclined compared to the paper feeding roller every time the cassette is attached or detached. Rather than prevent paper curl, it may help. This is because the cassette lid, the cassette body, the cassette positioning, and the device body, which are a total of four parts, are interposed between the roller and the paper feed roller, so the relative positional relationship between the roller and the paper feed roller is very ambiguous. Because it will be something.

[0007]

According to a first aspect of the present invention, there is provided a sheet feeding device which is movable with respect to one end of a sheet, and a movable guide means which guides the other end parallel to the end according to the width of the sheet. A sheet stacking unit capable of stacking a plurality of sheets, and a sheet stacking unit that is close to the reference side of the sheet so that the sheet can be fed and conveyed even when the width of the end portion and the other end portion of the sheet is narrow. The paper feed roller and the transport roller provided at the position, the paper separating means that is pressed against and held by the paper feed roller, and the transport roller provided on the downstream side of the paper transport path of the paper feed roller to feed the paper. In a paper feeding / conveying device comprising: a conveying unit that pulls out from a paper roller unit; and a releasing unit that cancels the driving of the paper feeding roller while the paper is being conveyed by the conveying roller and is driven to rotate by frictional resistance with the paper. Paper feed And a loading means for contacting the upper surface of the sheet with a predetermined distance to the upstream side of the roller and a predetermined distance from the sheet reference with one end of the sheet as a reference. Is a sheet feeding / conveying device.

According to a second aspect of the present invention, there is provided a paper feeding / conveying apparatus.
The sheet feeding / conveying device according to claim 1, further comprising: a loading unit and a sheet guiding unit that guides an upper portion of the sheet on a sheet guide surface on a sheet reference side of the sheet stacking unit. is there.

[0009]

With the above structure, it is possible to prevent the sheet 13 from being obliquely fed as described above and to provide a high quality copy image. That is, at the time of sheet conveyance, which is the above-mentioned problem, the sheet 1 is inserted between the manual sheet feeding roller 6 and the sheet separating mechanism which is in pressure contact with the manual sheet feeding roller 6.
3 is being conveyed, and the pressure contact force of this sheet separating mechanism,
It is added to the load sheet 13 when the manual sheet feeding roller 6 is driven to rotate. In this state, a moment is generated in the sheet 13 to which the sheet 13 is further conveyed.
3 is not conveyed straight, but is conveyed obliquely. Therefore, if a load is applied to the sheet 13 at a position away from the manual feed roller 6 so as to cancel this moment, the sheet will be fed obliquely. Can be prevented. That is, a distortion-free copy can be obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details will be described below based on the embodiments of the present invention shown in the drawings. Needless to say, the present invention is not limited to these examples.

1 (a) (b), 2 (a) (b), FIG. 3, FIG. 5, FIG. 5 (a) (b), and FIG. 6 are sectional views and views of an embodiment of the present invention. The figure is shown. That is, each example is shown as a method for applying a load to the upper surface of the sheet. In general, the magnitude of the moment that causes oblique feeding increases as the width of the conveyed sheet increases, so it is advisable to apply a load to the vicinity of the end of the maximum width sheet that can be conveyed by the sheet conveying apparatus. However, at that position, it is not possible to cope with the case where a sheet having an intermediate width is conveyed. Therefore, it is assumed that the load mechanism is installed near the seat reference position by about 100 to 180 mm. This position is near the edge of a sheet of B5 size or the like, and it is possible to simultaneously apply a load to a wider sheet. On the other hand, width 100m
For a sheet of m or less, the magnitude of the moment applied to the sheet at the time of conveyance is small, and the sheet length is generally short, so that it is not easily affected by oblique feeding, and thus it is often good without applying a load to the sheet.

As shown in FIG. 8, when the load is applied in the range of 100 to 180 mm from the sheet reference side,
It is near the sheet edge of 5R and B5R. Within this range, it is possible to deal with wider sheets of A4R and letter R. The load may be applied to the vicinity of the letter width end, but in order to reduce the cost, it is preferable to configure the load mechanism with as few members as possible within the range as small as possible. In order to take it as an example, it is good to configure the load mechanism with a small number of members in the smallest possible range. Although the sheet conveying apparatus taken as an example allows up to a letter size, it goes without saying that the sheet conveying apparatus can be applied to a conveying apparatus capable of handling a sheet having a width larger than this. In developing today's office machines and other products, whose cost is becoming lower, it is desired to realize a load mechanism that is as simple and low cost as possible.

Therefore, FIGS. 1 (a), 1 (b) and 2 (a)
(B) proposes a method of applying a load to the upper sheet surface stacked on the sheet stacking device 12 by utilizing the spring force and the spring property of the member. However, although it has a simple structure, it is necessary to increase the mounting accuracy of the members in order to apply a predetermined constant force. Details are shown in Figure 1 (a) and (b).
As shown in FIG.
3 is provided between a paper guide (upper) 10 and a paper guide (lower) 11 provided to guide the sheet at the time of conveyance,
In order to apply a load when the sheet 13 is set on the sheet stacking device 12, a member having a spring property, for example, a load mechanism such as a leaf spring 19 is joined to the paper guide (upper) 10 side with a screw 24 or the like. . The contact surface with the sheet 13 has a smooth curved surface so as not to damage the sheet 13 and to suppress load fluctuations. Sheet 1
The magnitude of the load applied to 3 can be determined by the plate thickness t of the plate spring 19, the width w, and the deflection e. Moreover, FIG.
As in (a) and (b), one end of the plate-shaped member 20 is rotatably held by the shaft portion 22 of the attachment member 23 fixed to the paper guide (upper) 10 with screws 24 or the like, and the spring 21 With the structure in which the end portion of the plate-shaped member 20 is pressed in the direction of the arrow, the magnitude of the load applied to the seat 13 can be determined by changing the spring force. However, since the load mechanism of FIGS. 1 and 2 utilizes the spring property, it is necessary to manage the variation of the spring force. Although the cost of the used parts is low, the cost for management becomes high.

Therefore, FIGS. 1 (a), 1 (b) and 2 (a)
(B) By adding a load mechanism to the load mechanism in the spring property utilization, it is possible to adjust the variation of the load to be applied and loosen the mounting accuracy, and to provide a stable load mechanism more easily. You can As shown in FIG. 3, a paper guide (upper) provided to guide the sheets 13 stacked on the sheet stacking device 12 during conveyance.
10 and the paper guide (lower) 11 between the paper guide (upper) 10 side and the paper guide (lower) 11 so that a load is applied when the sheet 13 is set in the sheet stacking device 12. Paper load (upper) to the load mechanism that is joined with screws 24 etc.
A load adjusting mechanism that changes the deflection of the leaf spring 19 by screwing through 10 and pressing the tip thereof against the load mechanism portion. This load adjuster has a head-shaped driver groove 25 that can be easily rotated by a driver.
In addition, it is pressed from below by a spring 26 so as not to loosen due to vibration or the like. That is, the load can be adjusted by changing the contact angle of the leaf spring 19 with respect to the seat 13 as shown by the broken line in FIG. By the way, when the load is applied by contacting the uppermost surface of the stacked sheets by utilizing the spring property of the member, the amount of load applied to the sheet 13 differs depending on whether the number of sheets is large or small. In some cases, the load may be so strong that the sheet being conveyed may be obliquely fed in the direction opposite to the normal diagonal feeding, or may exceed the regulation of the guide on the sheet reference side of the sheet stacking device 12. .

Therefore, as shown in FIGS. 4A and 4B, a part of the side guide portion on the sheet reference side of the sheet stacking device 12 is slightly higher than the maximum height of sheets stacked on the sheet stacking device 12. A sheet upper guide 18 that regulates the upper side of the sheet 13 is provided at the position, and
The diagonal feed of the seat can be regulated so as not to get over. The sheet upper guide 18 regulates the sheet end portion from above at a position slightly higher than the sheet height that can be stacked on the sheet stacking device 12, on a part or the entire surface of the sheet reference side guide part of the sheet stacking device 12. It has a shape. The sheet guide 18 is used for the sheet stacking device 1
The convex amount is small, for example, about 0.3 to 0.5 mm, so as not to get in the way when the sheets 13 are stacked on the sheet 2. If the load strength of the load mechanism in the front is large, a force is applied to the reference side guide on the sheet 13 during sheet conveyance, and the sheet 13 rides on the reference side guide, and even if the amount of protrusion is small. The seat can be regulated sufficiently.
The above-mentioned sheet guide 18 can be handled by attaching a sheet-like member with an adhesive or the like, or by incorporating the shape of the above-sheet guide 18 into the sheet stacking device 12 itself by injection molding, for example.

As described above, when the spring force is used, the amount of load applied changes depending on the amount of seats.
In (a), a load mechanism having a structure in which weights (for example, round bar-shaped members so as not to damage the sheet surface) are joined by a thin film sheet 27 so that only its own weight is applied to the sheet 13 with almost no elasticity. Is proposed. With this structure,
Since only the self-weight of the weight is applied to the upper surface of the sheet, a substantially constant load can be applied to the surface of the sheet even if the stacking amount of the sheet changes. This loading mechanism is composed of a round bar-shaped weight 28 and a thin film sheet 27 around the outer circumference of the weight. An adhesive is applied to the thin film sheet 27, and the weight 28 is attached so as not to fall off. The round bar-shaped weight 28 is effective because it does not damage the surface of the sheet 13 when it comes into contact with the surface of the sheet 13. The other end of the thin film sheet 27 is fixed to the paper guide (upper) 10 with an adhesive or the like. However, with this structure, when the fed sheet 13 causes jamming due to some trouble or the like, and the jammed sheet is automatically pulled out to the sheet stacking device 12 side,
As shown in FIG. 5B, the damaged portion of the sheet 13 may catch the weight portion and be pulled out to the outside, possibly damaging the thin film portion.

FIG. 6 is composed of a plate-like weight 29 and a thin film sheet 30 for holding the plate-like weight. The plate-shaped weight 29 reinforces the flexibility of the sheet 30 on which the thin film is placed, and has a length such that the plate-shaped weight 29 cannot rotate between the paper guide (upper) 10 and the paper guide (lower) 31. There is. The plate-shaped weight 29 is adhered to the thin film sheet 30 with an adhesive or the like, and the other end of the thin film sheet 30 is adhered and fixed to the paper guide (upper) 10 with an adhesive or the like. Holds 29. At this time, the distance between the end portion of the weight and the curved portion of the thin film sheet is arranged so as to be kept to the minimum so that the weight can move up and down smoothly. By doing so, it is possible to prevent the weight from being pulled out when the sheet is pulled out during jamming. It should be noted that the thin film sheet 3 is brought into contact with the sheet 13 in order to apply a load to the sheet surface even on the side of the plate-like weight 29.
It is possible on either side 0. The load applied to the sheet 13 depends on the size of the plate-shaped weight 29 and the thin film sheet 3.
It can be easily changed with 0 material or the like.

Others The present invention is not limited to the actual examples described above and shown in the drawings, and it is needless to say that the present invention can be appropriately modified and implemented without departing from the scope of the invention.

[0019]

According to the present invention, the sheet 13 is used as described above.
It is possible to prevent the image from being slanted and provide a high quality copy image. That is, at the time of sheet conveyance, which is the above-mentioned problem, the sheet 13 is conveyed between the manual sheet feeding roller 6 and the sheet separating mechanism that is in pressure contact with the manual sheet feeding roller 6, and the pressure contact force of the sheet separating mechanism A load is applied to the sheet 13 when the manual feed roller 6 is driven to rotate. Sheet 1 further in this state
Since a moment is generated in the sheet 13 when 3 is conveyed, the sheet 13 is not conveyed straight but is conveyed obliquely. Therefore, it is necessary to cancel this moment.
If a load is applied to the sheet 13 at a position distant from the manual feed roller 6, the sheet can be prevented from being obliquely fed, and as a result, a very high quality copy image without distortion can be obtained.

[Brief description of drawings]

FIG. 1A is a sectional view showing a first embodiment of the present invention. (B) It is an arrow A figure of a sectional view showing the 1st example of the present invention.

FIG. 2 (a) is a sectional view showing a second embodiment of the present invention. (B) It is a B arrow line view of a sectional view showing the 2nd example of the present invention.

FIG. 3 is a sectional view showing a third embodiment of the present invention.

FIG. 4A is a sectional view showing a fourth embodiment of the present invention. (B) It is a C arrow line view of a sectional view showing the 4th example of the present invention.

FIG. 5A is a sectional view showing a fifth embodiment of the present invention. (B) It is sectional drawing which shows the jamming state of the 5th Example of this invention.

FIG. 6 is a sectional view showing a sixth embodiment of the present invention.

FIG. 7 is a cross-sectional view of a conventional device.

FIG. 8 is a top view of a conventional device.

[Explanation of symbols]

 6 Manual Feeding Roller 7 Manual Feeding Roller 8 Spring 9 Mass Plate 10 Paper Guide (Upper) 11 Paper Guide (Lower) 12 Sheet Stacking Device 13 Sheet (Paper) 18 Sheet Top Guide 19 Leaf Spring 20 Plate-like Member 21 Spring 22 Axis Part 23 Mounting member 24 Screw 25 Driver groove 26 Spring 27 Thin film sheet 28 Weight 29 Plate-like weight 30 Thin film sheet 50 Paper entry detection unit 51 Paper feed roller B 53 PS plate 70 Clutch

Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical location G03G 15/00 (72) Inventor Toshiki Ogita 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Within Sharp Corporation

Claims (2)

[Claims] 1. A movable guide means for guiding the other end parallel to the one end of the paper in accordance with the width of the paper with one end of the paper as a reference, a paper stacking means for stacking a plurality of papers, and A paper feed roller and a feed roller provided in a position close to the reference side of the paper so that the paper can be fed and fed even when the width of the end portion and the other end portion of the paper is narrow; A sheet separating means that is held in pressure contact with the roller,
Conveying means for pulling the sheet out of the sheet feeding roller section by the conveying roller provided on the downstream side of the sheet feeding path of the sheet feeding roller, and releasing the driving force of the sheet feeding roller during sheet conveying by the conveying roller. A sheet feeding / conveying device including a releasing unit that is driven to rotate by frictional resistance with the sheet, and is separated from the sheet reference by a predetermined distance to the upstream side of the sheet feeding roller and by using one end of the sheet as a reference. A sheet feeding and conveying device, characterized in that it has a loading means for contacting the upper surface of the sheet and applying a load at a position separated by a predetermined distance. 2. The sheet feeding / conveying device according to claim 1,
A paper feeding / conveying device comprising: a paper loading unit, and a paper guide unit that guides an upper part of a paper on a paper guide surface on a paper reference side of a paper stacking unit.