JPH0248464B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sheet material lateral deviation correction device, in particular,
For example, the present invention relates to an image forming apparatus such as an electrophotographic copying machine, a micro device, or a recording device.

Hereinafter, a copying machine will be described as an example of an image forming apparatus, but the present invention is not limited thereto.

[Conventional technology]

In recent years, an electrophotographic copying machine has been devised in which a transfer paper conveyance path for double-sided copying or multiple copying is provided within the electrophotographic copying machine, as shown in FIG. In this type of device, for example, the rollers of the transport roller pair may be pressed against each other with uneven force over their entire length, or the rollers may be slightly distorted due to manufacturing reasons, resulting in a conical shape or the like. The transfer paper often does not move properly due to the following reasons: the surface of one of the roller pairs is dirty, or the axis of this roller pair is not perpendicular to the direction of travel of the transfer paper. The conveyance path was oblique to the actual conveyance path, causing the problem of poor conveyance. Therefore, an apparatus using lateral registration rollers 147 as shown in FIG. 8 may be considered.

The configuration of FIG. 8 will be explained below. However, the 8th
The configuration of the figure itself is not publicly known.

FIG. 8 is a sectional view of the copying apparatus. The original 102 placed on the original placing glass 101 is placed on the lamp 10
3, and the light image is reflected by a reflecting mirror 10.
4, 105, 106, 107, 108, 109 and a lens 110, the light is guided onto the photosensitive drum 111. Lamp 103 and mirrors 104, 105, and 106 scan original 102 at a predetermined speed in the direction of the arrow. On the other hand, since the photosensitive drum 111 is also rotated in the direction of the arrow after its surface is uniformly charged by the charger 112,
Electrostatic images corresponding to the original image are sequentially formed on the drum surface. A color developer 11 containing color toner (for example, red, blue, etc.) is located around the photosensitive drum 111.
3. A black developing device 114 containing black toner is provided. Each of these developing devices is movable in the direction of the arrow, and approaches the photosensitive drum 111 to visualize the electrostatic image on the drum depending on a desired color image. In the case of this figure, the color developer 113
Since the drum is separated and the black developing device 114 is close, a black image is formed on the drum. This image is transferred to transfer paper by a transfer charger 115. Thereafter, the photosensitive drum 111 reaches a cleaner 116, where residual toner on the drum surface is removed, and the process returns to the next step.

The transfer paper 117 performs the following operations to copy the original image. There are the following methods for feeding the transfer paper 117 into the copying apparatus. One of the sheets is loaded in a cassette 118 and sent to a pair of rollers 120 by a feed roller 119. The roller pair 120 is designed to separate only the top paper when multiple sheets of transfer paper 117 are fed into the apparatus, and after passing through the roller pair 120, the transfer paper 117 reaches the register roller 123 via guide plates 121 and 122. In the second method, sheets are stacked in a cassette 124 and sent to a pair of rollers 126 by a feed roller 125. roller pair 126
has the same function as the previous roller pair 120, and after the transfer paper 117 passes through the roller pair 126, it is transferred to the guide plate 1.
It reaches the register roller 123 via 27 and 128. The other method is so-called manual paper feeding, in which case the manual feed tray 129
Rotate in the direction of the arrow and insert the transfer paper into the manual feed middle plate 13.
0 and placed on the manual feed tray 129, it is sent to the register rollers 123 in the same manner as in the first method.

The register roller 123 starts rotating at a timing such that the developed image on the photosensitive drum 111 and the transfer paper coincide, and feeds the transfer paper to the drum surface via an upper transfer guide 131 and a lower transfer guide 132. As mentioned earlier, the transfer paper is charged by the transfer charger 11.
5, the image on the drum surface is transferred, separated from the drum surface by a separation charger 133, and sent to a fixing device 135 via a conveying section 134. The image on the transfer paper is fixed as a permanent image by a fixing device 135, and the transfer paper is sent to a first discharge roller 136. After that, it reaches the second ejection roller 139 via the first flapper 137 and the second flapper 138, and is then ejected out of the copying apparatus. In the diagram,
The second flapper 138 is in a state blocking the transfer paper path, but since this second flapper 138 is made of a light material and is rotatable in the direction of the arrow, when the transfer paper passes Since it is pushed up by the leading edge of the transfer paper and takes a retracted position with respect to the transfer paper, there is no problem in passing the transfer paper.

This copying apparatus is capable of performing the following operations in addition to the basic transfer paper operations described above.

One of them is an operation for performing double-sided copying. In the case of double-sided copying, the copying operation to the first side of the transfer paper is almost the same as the basic operation described above, and the transfer paper is guided to the second discharge roller 139. The second discharge roller 139 discharges the transfer paper out of the device,
When the double-sided copy mode is specified, the detection arm 140 and the optical sensor 141 detect the trailing edge of the transfer paper, and after the trailing edge of the transfer paper passes the second flapper 138, the second discharge roller 139 moves the rear edge of the transfer paper. Start reversing while holding the end. Therefore, the transfer paper is fed into the copying machine again with the trailing edge first. and,
It is sent to the roller pair 45 via the left side slopes of the first flapper 137 and the second flapper 138 and the guide plate 142, and further via the guide plates 143 and 144. Thereafter, the transfer paper passes through a pair of rollers 46 and reaches a lateral register roller 47. At this point, the lateral register roller 47 has stopped, and after the transfer paper has completely abutted against this roller 47, the roller pair 45, 46
will also stop. Then, the transfer paper waits for copying operation to the other side. Thereafter, when a copy signal for the other side is issued, the pair of lateral registration rollers 47 starts rotating and feeds the transfer paper to the registration roller 123 via the guide plates 148 and 149. Before the transfer paper reaches the register roller 123, the side edge of the transfer paper is detected by an unillustrated optical sensor, and the horizontal register roller is moved in a direction perpendicular to the paper traveling direction so that the side edge is the same as the first side. That is, the lateral position of the transfer paper is corrected by moving in a direction perpendicular to the drawing. The operation after the transfer paper reaches the register roller is the same as the basic operation described above, and the transfer paper with the image copied on the other side is finally ejected out of the apparatus by the second ejection roller 139. Ru.

Another type of operation of the transfer paper is the operation in the case of multiple copying in which copies are made two or more times on one side of the transfer paper. In this operation, the movement of the transfer paper in the first copy is almost the same as in the basic operation, but when the multiple copy mode is specified, the first flapper 137 is in the state shown by the broken line, and the first ejection roller The transfer paper sent out from the first flapper 136 is guided by the right slope of the first flapper 137 and the guide plate 143, and is sent as it is to the lateral register roller 47. The subsequent movement of the transfer paper is the same as in the double-sided copying mode, and the transfer paper on which the second copy has been made on the same side as the first copy is finally ejected from the apparatus by the second paper ejection roller 139. Ru. Note that the first flapper 137 returns to the position indicated by the solid line when the transfer paper is fed into the horizontal register roller 47 after the first copy, in preparation for passing the transfer paper after the second copy.

Next, the above-mentioned lateral register roller will be explained in detail. The horizontal register roller is used to adjust the position of paper in order to copy the paper once again, such as double-sided copying or multiple copying.
This device corrects the position of the paper in a direction perpendicular to its direction of travel.

First, the paper is transported by transport rollers 45 and 46 and enters the nip of lateral register rollers 47. At this time, the horizontal register roller has stopped rotating, and the conveyance roller forms a loop in the paper immediately before the horizontal register roller, and then stops. This is to correct the skew of the paper and to allow the paper to follow the lateral movement of the lateral register rollers with sufficient margin. Next, the horizontal register roller starts rotating and grips the paper. After the paper is sufficiently gripped by the horizontal register roller, the horizontal register roller 47 moves in a direction perpendicular to the direction in which the paper travels. While this operation is being performed, the lateral register rollers continue to rotate and convey the paper.
Through this series of operations, the paper is moved to the correct position set in advance, so that during the second copying operation, the correspondence with the first copied image is accurate, resulting in more accurate and beautiful multiple copies or double-sided copies. It can be taken.

With this configuration, the paper position is corrected in the lateral direction within a shorter conveyance path compared to conventional devices that use oblique feed rollers to bring the edge of the paper into contact with a guide at a reference position. This makes it possible to downsize the entire machine.

[Problem that the invention seeks to solve]

This type of device is used to (1) correct the skew feeding of the paper and ensure that the leading edge of the paper enters the nip of the horizontal register roller, and (2) when the horizontal register roller moves in the horizontal direction, the horizontal register roller 47 A sufficient loop is formed on the inlet side of the lateral registration roller in order to prevent the paper from being stretched in the lateral direction between the paper and the conveying roller 46 in front of the lateral registration roller, and to provide room for the movement of the paper. There is a need. At this time, the paper forms a loop as shown in FIG. 9, so that the paper comes into close contact with the upper entrance guide plate 150 (hereinafter referred to as "upper guide plate") fixed on the main body.
When the lateral registration roller 47 begins to move for lateral registration adjustment in this state, the paper forming the loop rubs against the upper guide plate 50 as it moves. Therefore, there is a problem that the paper may be damaged due to friction between the upper guide plate 50 and the paper. In particular, if the paper rubs against the edges (cut ends of the sheet metal) that are close to the rollers of the guide plate, which is made of iron plates, there are problems such as the paper being damaged or scratches, resulting in paper dust coming out and adhering to the rollers. .

In addition, if the upper guide plate is fixed on the main body when trying to remove paper jammed in the horizontal register roller section, the guide plate may get in the way and cause a jam near the nip of the horizontal register roller. It becomes difficult to remove paper and damaged paper.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide an apparatus that can reduce the load caused by the contact between the guide plate and the paper due to the movement of the lateral register rollers. Additionally, it is an object of the present invention to provide a device that facilitates the removal of jam paper.

[Means for solving problems]

In order to achieve the above-mentioned object, a sheet material lateral shift correction device according to the present invention includes a sheet material lateral shift correction device having a lateral registration roller that displaces a sheet in a direction perpendicular to a predetermined conveyance direction. The present invention is characterized in that it is provided with an entrance guide that guides the user, and that the entrance guide is moved in conjunction with the displacement of the lateral register rollers.

[Effect]

According to the feature of the present invention described above, since the guide also moves in conjunction with the displacement of the lateral register roller, contact slippage between the sheet and the guide does not occur.

〔Example〕

Hereinafter, a detailed explanation will be given based on specific examples.

FIG. 1 is a perspective view of the apparatus of the present invention. FIG. 2 is a front view of the device of the present invention.

This device uses a cam 51 to perform lateral movement of the lateral register roller and an electromagnetic clutch 5.
The rotation of input gear 55a controlled by gear 5
This is a device in which the paper is conveyed to the lower horizontal register roller 47b via the rollers 6 and 57.

Hereinafter, a specific operating procedure of the lateral register roller to which the present invention is directed will be explained.

First of all, paper enters from the direction of arrow A, and a sensor (not shown) detects the passage of paper just in front of the lateral register rollers. The conveyance roller 46 conveys the paper until a specific time elapses based on this timing. At this time, since the lateral register roller 47 is stopped, the conveying roller 46 stops after a predetermined time, and a loop of an appropriate amount is formed between the lateral register roller 47 and the conveying roller 46. Next, when the electromagnetic clutch 55 is turned on, the rotation of the input gear 55a is transmitted, and the lower lateral register roller 47b begins to rotate. At the same time, the spring clutch 53 is turned on and the rotation of the input gear 53a is controlled by the cam 5.
1. The cam 51 pushes the lateral register roller block 52 holding the upper and lower lateral register rollers 47 in the direction of arrow C, and the two upper and lower lateral register rollers are moved in the lateral direction (C) via this lateral register roller block 52. direction). At this time, when the edge of the paper reaches a predetermined position, the light sensor 60 fixed on the main body is blocked by the moving paper and issues a signal, indicating that the horizontal registration correction is complete. Communicate to the controller that cannot be displayed. As a result, the lateral movement of the rollers is stopped, and the electromagnetic clutch 55 continues to be ON to convey the paper until the paper moves away from the lateral register rollers.

Furthermore, compression coil springs 61 are attached to the upper and lower lateral register rollers 47 at four locations to press the rollers in the direction of arrow B. Therefore, when the cam 51 continues to rotate and moves to the limit in the direction of arrow C,
Next, when the inclined surface of the cam is displaced in the direction of arrow B, the compression coil spring presses the upper and lower lateral register rollers in the direction of arrow B so that the roller 47 follows the change in the inclined surface of the cam.

When the roller 47 moves to the home position (a specific position where it waits until paper enters), a light shielding plate 54 mounted coaxially with the spring clutch 53 shields the optical sensor 58 from light. In response to this signal, the spring clutch 53 is turned OFF, the rotation of the cam plate 51 is stopped, and the lateral movement of the roller is completed.

The embodiment of the present invention is particularly characterized by a lateral register roller upper guide plate 150 (hereinafter referred to as "upper guide plate").

The upper guide plate 150 of the present invention has blocks 59 at both ends of the front and back that fit with the upper roller shaft 47d, and the blocks 59 are fixed to the upper guide plate 150 with screws 70. FIG. 3 is a side view of the upper guide plate 150 of the present invention, and the upper guide plate 150 is opened in the direction of the arrow about the center axis of the upper roller 47a.

Embossed (protruded) 63 is the upper guide plate 150
This is to maintain a gap between the lower guide plate 162 and the lower guide plate 162, and the paper passes through this gap. Block 5
9 is the upper roller 47a at both ends of the upper roller 47a.
When the upper roller 47a moves in the lateral direction, the upper guide 15
0 also moves at the same time.

Furthermore, the block 59 has a shape as shown in the figure (the protrusion 5
9a), when the upper guide plate 150 is rotated in the direction of the arrow in FIG.
contact with the central axis 47d of b. Therefore, when the lower roller 47b is fixed at a specific position on the main body and the upper roller 47a is supported so as to be able to move away from the surface of the lower roller, the protrusion 59a of the block
The tip of the upper roller lifts the upper roller in the direction of the arrow in FIG. 4 with respect to the lower roller, and the nip between the upper and lower rollers is opened. Therefore, jamming becomes easier.

Next, other embodiments of the present invention will be specifically described in detail.

FIG. 5 is a perspective view showing another embodiment of the invention.

The upper guide plate 165 of this embodiment is cut at both ends to form a vertically bent portion 165a, and this vertically bent portion is provided with two holes for holding the center shaft 47d of the upper roller 47a. Further, a shaft 164 is fixed at a fixed position on the main body (not shown), and this shaft 164 also passes through holes on the vertically bent portions at both ends of the upper guide plate 165. The horizontal register block 152 has a guide groove 152a formed therein, into which the center shaft 47d is fitted.

FIG. 6 is a side view of this embodiment, and the upper guide plate 165 rotates about a shaft 164. At this time, the upper guide plate 165
Since the upper guide plate 165 is rotated in the direction of the arrow as in the previous embodiment, the upper guide plate 165 opens as shown in FIG. 7, the upper and lower rollers are separated, and the upper and lower roller nip This makes it very easy to dispose of paper that is jammed in the section. Note that when the roller moves in the axial direction for lateral registration adjustment, the upper guide plate 165 also moves at the same time. The shaft 164 slides in the fitting hole with the upper guide plate 165, and there is no problem with the movement of the rollers.

In the paper lateral registration adjustment device of an electronic copying machine that can automatically make multiple copies or double-sided copies as described above, the lateral registration roller entrance guide moves integrally with the rollers as in the embodiment of the present invention. However, if it is configured to rotate around a roller or other shaft, the contact resistance between the paper and the guide plate during horizontal registration adjustment will be reduced, and the paper will be conveyed smoothly. By opening and closing, it becomes easier to dispose of jams.

〔Effect of the invention〕

Since the image forming apparatus according to the present invention has the above-described configuration, there is no contact rubbing between the sheet and the guide when the lateral register rollers are displaced, and there is an effect that damage to the sheet material can be prevented. Also,
By configuring the guide to be openable, there is an effect that jamming etc. can be easily performed.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the device of the present invention, Fig. 2 is a schematic diagram illustrating the mechanism of the device of the present invention, Fig. 3 is a side view of the device of the present invention, and Fig. 4 shows the upper guide plate of the device of the present invention. FIG. 5 is a perspective view showing another embodiment of the present invention, FIG. 6 is a side view showing another embodiment of the present invention, and FIG. 7 is a perspective view showing another embodiment of the present invention. FIG. 8 shows the situation when the upper guide plate of the embodiment opens.
The figure is a sectional view of a copying machine to which the present invention is applied, and FIG. 9 is a diagram showing a situation in which paper forms a loop at the inlet side of the lateral register rollers. 47...Horizontal registration roller, 150, 165...
...Top guide.

Claims (1)

[Scope of Claims] 1. A sheet material lateral shift correction device having lateral registration rollers 47 for displacing the sheet in a direction perpendicular to a predetermined conveyance direction, comprising entrance guides 150, 165 for guiding the sheet to the lateral registration rollers, A sheet material lateral shift correcting device characterized in that the entrance guide is moved in conjunction with the displacement of a lateral registration roller. 2. The entrance guide 150 is connected to the shaft 47 of the roller.
The sheet material lateral shift correcting device according to claim 1, characterized in that the device rotates around d. 3. The sheet material lateral deviation correcting device according to claim 1, wherein the entrance guide 165 is rotatably locked around a shaft 164 fixed on the main body of the device.