JPS6180271A - Branching device for copying paper conveying path in copying machine - Google Patents

Abstract

PURPOSE:To simplify construction by constituting a conveying direction change device in such a manner that the outlet of a forward path and the inlet of a return path are communicated with the outlet and inlet of a temporarily accepting and reversing part for upsetting and that the outlet of the forward path is communicated with the inlet of a discharge device. CONSTITUTION:The copying paper subjected to fixing 25, 25' is conveyed by guide plates 26, 26' and guide rollers 27, 28 toward a guide roller 30 and free revolving roller 29 of the temporarily accepting and reversing part for upsetting C. The conveying direction change base plate 40 and conveying direction change follow up plate 41 of the conveying direction change device B are in the position of solid lines and therefore the copying paper is conveyed toward the roller 30 and the roller 29. The roller 29 is at the same time in the position of the virtual line where an actuator 51 is preliminarily de-energized and the conveyed copying paper is accepted into the part C. When the actuator 51 is energized in the stage while the rear end of the copying paper is in contact with the roller 30, the roller 29 moves to the position of the solid line and the rear end of the copying paper is pinched by the roller 30 and the roller 29. The copying paper is moved backward by the rotation thereof so as to pass over the base plate 40 and is conveyed by means of the guide rollers 28, 36, guide plates 37, 38 and guide rollers 53, 53'.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a copying machine, and particularly to a branching device for transporting copy paper in a double-sided copying machine.

"Prior Art" Conventionally, copy paper used to copy objects such as manuscripts has been copied only on one side.
The need for double-sided copying has arisen in order to conserve copy paper, and because when a large amount of copy paper is consumed, the amount of paper used is halved, making storage of old copy paper more efficient.

For this reason, various double-sided copying devices have been developed.
Both copying machines incorporate mechanisms such as a paper feed section, a transfer section, a fixing section, and an ejection section, as well as a reversing and branching device for reversing the front and back of copy paper.

In order to reverse this copy paper, the paper is fed from the paper feed section of the copying machine, transferred, fixed, and then proceeded to the output section.The path of the copy paper is then branched and reversed to be returned to the paper feed section. A branching device is required.

This conventional branching device will be explained with reference to FIG. 4. Copy paper is fed from a paper cassette (not shown) installed in a copying machine, transferred to a transfer section (not shown), and transferred to a fixing roller. 71, 71'. Fixing roller 7
1, 71', the copy paper fixed on one side is placed on the guide plate 72.
, 73, 74, and then conveyed by guide rollers 75, 76 to conveyance direction control rollers 79°, 79'. In this case, the guide rollers 75 and 76 and the conveyance direction control rollers 79 and 7
Since the conveyance direction branching plate 87 interposed between the conveyance direction branching plate 7' and the conveyance direction control roller 7' is located at the position indicated by the broken line, the copy paper is not obstructed by the conveyance direction branching plate 87 and is disposed between the conveyance direction control roller 7' and the conveyance direction control roller 7'.
' will be transported. At the same time, the conveyance direction control roller 79 is always rotated clockwise, but the conveyance direction control roller 79
′ is at the position of the solid line.

The leading edge of the copy sheet conveyed to the conveyance direction control rollers 79 and 79' advances along the guide plate 78 and comes into contact with the sponge roller 80, but the rear end thereof touches the conveyance direction control roller 79. At this stage, the conveyance direction control roller 79' moves from the position indicated by the solid line to the position indicated by the broken line, and comes into contact with the conveyance direction control roller 79', so that the rear end of the copy sheet is held between the conveyance direction control rollers 79, 79'. When this copy paper is held, the conveyance direction control roller 79 moves clockwise,
By counterclockwise rotation of the conveyance direction control roller 79', the copy paper passes between the guide plate 73' and the conveyance direction switching plate 87 and is reversely advanced to the guide rollers 76.85.

The single-sided copy paper that has been branched and reversed in this manner is reversed while passing through a return path (not shown) via the guide plate 84 and is conveyed to the paper feed section.

This inverted copy sheet with its back side, which has not yet been copied, facing upward, is fed again. The re-fed copy paper is transferred by a transfer section (not shown) and conveyed to fixing rollers 71, 71'. The copy paper fixed by the fixing rollers 71 and 71' is moved to the guide plates 72 and 73.

74 and guide plate 81.8 by guide rollers 75.76.
2 and conveyed to discharge rollers 83, 83'.

In this case, the conveyance direction switching plate 87 has been rotated about the pivot shaft 86 from the position indicated by the broken line to the position indicated by the solid line in response to a command signal in advance, so that the copy paper conveyed from the guide rollers 75 and 76 is rotated in the conveyance direction. The discharge roller 83 comes into contact with the switching plate 87.
, 83'. Discharge roller 83
, 83', the double-sided copy is completed, and the copy paper is discharged to a copy tray (not shown).

[Problems to be Solved by the Invention] By the way, in such a reversing and branching mechanism, there are two paths, namely, a path where the copy paper goes to the transport direction control rollers 79, 79' and a path where the copy paper goes to the discharge rollers 83, 83'. be. In these two passages, there are two pairs of guide plates, a guide plate 77.7B and a guide plate 81.82, and this guide plate 77.
78, since the copy paper is guided by the guide plates 81 and 82 and conveyed to each path, two pairs of guide plates 77, 78 and 81 and 82 are required, which increases the cost and complicates the structure. There was a point.

In addition, with this reversing and branching mechanism, during single-sided copying, the gap between the conveyance direction branching plate 87 and the guide plate 82 inevitably becomes wider, making it difficult to regulate the copy paper, and as a result, the copy paper traveling in the reverse direction may cause a paper jam phenomenon. There was also the problem of waking up.

``Means for Solving the Problems'' Therefore, the present invention has been made by focusing on the above-mentioned problems. a forward feeding path A for temporarily receiving the copy paper sent from the conveyance direction switching device B, and a reversing temporary receiving and reversing section C for reversing the copy paper, and a reversing temporary receiving and reversing section C for reversing the copy sheet. a discharge device which has an entrance portion adjacent to the entrance portion of the conveyance direction switching device B and discharges the copy paper fed from the conveyance direction switching device B to the outside of the copying machine; and an entrance portion adjacent to the exit portion of the progressive path A. and is disposed at a return path E for returning the copy paper sent from the transport direction switching device B toward the transport path immediately after the sheet feeding, and at an exit portion of the progressive path A. , guide rollers 27 and 28 that feed the copy paper sent from the progressive path A toward the transport direction switching device B;
Guide rollers 28 and 36 are disposed at the entrance of the return path E, and guide rollers 28 and 36 are provided to draw in the copy paper sent from the transport direction switching device B and send it to the return path E, and the transport direction switch Device B includes a transport direction switching board 40 which is rotatably supported with respect to the copying machine main body, and a transport direction switching board 40 facing away from the copy paper transport surface of the transport direction switching board 40. 4o, and a conveyance direction switching follower plate 41 that rotates integrally with the conveyance direction switching board 40 while forming a copy paper conveyance path between the forward conveyance path A and the forward conveyance path A in the first rotational position. The exit of the snow road E and the entrance of the snowy road E are communicated with the entrance of the reversing temporary receiving reverse section C, and in the second rotational position, the exit of the progressive path A is communicated with the entrance of the discharge device. is configured to
It is an object of the present invention to provide a branching device for a copy paper transport path in a copying machine to solve the above-mentioned problems.

``Example'' Hereinafter, how the configuration of the present invention is actually embodied will be explained with reference to the drawings, together with its operation.

FIG. 1 is a longitudinal cross-sectional view of a copying machine in which a branching device for a copy paper conveyance path in a copying machine is incorporated according to an embodiment of the present invention. It is divided into two parts along the lower copying machine stand X and the upper copying machine upper swinging part Y, and the copying machine upper swinging part Y is normally placed on the copying machine stand X in a horizontal position. However, if an accident such as a paper jam occurs in the copying machine, the upper swinging part Y of the copying machine tilts with respect to the copying machine base X as shown in the imaginary line about the pivot shaft 67. This allows the interior of the copying machine to be opened.

A paper feed cassette 1 storing copy paper p is mounted on the right end side of the copying machine base X, and a paper feed roller 2 for feeding the copy paper p is provided above the paper feed cassette 1. ,
The copy paper fed by the paper feed roller 2 is fed to the guide plates 3 and 4.
．． 5, guide rollers 6, 6', guide plates 7, 7', and guide rollers 8, 8'.

A photosensitive drum 9 whose entire circumferential surface is coated with a photosensitive layer (not shown) is rotatably mounted approximately in the center of the copying machine, and a light source 15 projects light onto the original on a transparent plate 14. The reflected light passes through the reflecting mirror 16, movable reflecting mirrors 17 and 18, and lens 2.
The image of the document is projected onto the photosensitive layer through the movable reflecting mirror 19 to form an electrostatic latent image on the photosensitive layer.

Around the photosensitive layer 9, there is a charging corona discharger 11 that sequentially charges the photosensitive layer along the direction of rotation, and a toner image that visualizes the electrostatic latent image formed on the photosensitive layer. a developing device 12 for transferring the toner image formed on the photosensitive layer onto copy paper; a transfer corona discharge device 101 for transferring the toner image formed on the photosensitive layer onto copy paper;
0', devices such as a cleaning device 13 for removing toner remaining on the photosensitive layer after transfer are arranged.

Reference numerals 21 and 22 denote a pair of rollers, and a roller 23 is stretched between the rollers 21 and 22 to send the copy paper transferred from the photosensitive drum 9 to the fixing roller 25 and 25' via a guide plate 24. has been done.

The copy paper heat-fixed by the fixing rollers 25, 25' is conveyed along a progressive path A to guide rollers 27 and 28 toward a conveyance direction switching device B, as shown in FIG. The guide rollers 27 and 2B temporarily accept the copy paper and then move it backwards through the first path toward the free rotation roller 29 with the guide roller 30 of the reversing temporary receiving and reversing section C, and the guide roller 27. , 28, the copy paper is conveyed along a second guide path toward the discharge roller 34 of the discharge device D, which discharges the copy paper directly toward the discharge port 35, which discharges the copy paper outside the copying machine, and the discharge roller 30, which also serves as the guide roller 30. .

The conveyance direction switching device B branches these two guide paths into a first guide path for copying the opposite side of the copy paper with one side fixed, and a second guide path for copying both sides.
It is. As shown in FIGS. 2 and 3, this conveyance direction switching device B includes a conveyance direction switching board 40 that can rotate about a pivot 39 with respect to the main body of the copying machine, and this conveyance direction switching board 40. and a conveyance direction switching follower plate 41 facing away from and facing away from the copy paper conveyance surface. This conveyance direction switching follower plate 41 forms a copy paper conveyance path S between it and the conveyance direction switching board 40, and rotates integrally with the conveyance direction switching board 40, so that the copy paper conveyance path S always has a constant interval. are doing.

An arm 42 projects from the pivot 39 of the transport direction switching board 40, and the other end of the arm 42 is pivotally supported by a pivot 43 on a rod 45 of the actuator 44. Then, when the actuator 44 is energized, the transport direction switching board 40 and the transport direction switching follower plate 4
1 is located at the position indicated by the solid line in FIG. That is, the progressive path A
It is in the first rotational position where the exit of the reversing path and the entrance of the return path E are communicated with the entrance and exit of the reversing temporary receiving and reversing section C1. Furthermore, when the actuator 44 is de-energized, the conveyance direction switching board 40
Then, the conveyance direction switching follower plate 41 moves from the position indicated by the solid line to the position indicated by the imaginary line. In other words, the second rotational position is reached in which the outlet of the progressive passage A is communicated with the inlet of the discharge device.

Is the guide roller 39 of the reversing temporary receiving and reversing section C always in the clockwise direction? It is rotating. Also, the free rotating roller 29
is pivotally supported by its rotating shaft 46 or arm 47, the other end of this arm 47 is pivotally supported by a link 49 at a pivot 48, and the other end of this link 49 is pivoted by a rod 52 of an actuator 51 and its pivot 50. It is centrally supported. Then, when the actuator 51 is energized, the free rotation roller 29 reaches the position shown by the solid line, contacts the guide roller 30, and rotates counterclockwise. When the actuator 51 is de-energized, the free rotation roller 29 is displaced from the position shown by the solid line to the position shown by the imaginary line, and the engagement between the guide roller 30 and the free rotation roller 29 is released. When the freely rotating roller 29 is positioned on the imaginary line and is spaced apart from the guide roller 30, the front end of the copy paper sent from the guide rollers 27 and 28 passes through and is placed on the temporary reversing guide plates 31 and 32. .33 accepted.

Then, when the rear end of the copy paper is still in contact with the guide roller 30 or in the vicinity thereof, the actuator 51 is energized to move the freely rotating roller 29 from the position of the imaginary line to the position of the solid line to copy the copy paper. The rear end portion is clamped, and the copy paper is moved backward toward the guide rollers 28 and 36 by clockwise rotation of the guide roller 30 and counterclockwise rotation of the freely rotating roller 29. The copy paper conveyed to the guide rollers 28 and 36 passes through the guide plates 37 and 38 of the return path E, and then reaches the guide roller 5.
3.5.3'.

The copy paper conveyed to the guide rollers 53, 53' passes through the guide plate 54, 54', the guide rollers 55, 55', and the guide plate 56, 56', and then reaches the guide rollers 57, 57, as shown in FIG. ' will be transported to.

Reference numeral 60 denotes a copy paper width aligner for aligning the widths of the copy sheets conveyed from the guide rollers 57 and 57'; the copy sheets whose widths have been made equal here are brought into contact with a stopper 62 by the conveyance roller 61; The tips are aligned. 63.6
3' is a paper feed roller that refeeds the copy paper that has come into contact with the stopper 44, and the copy paper fed here is passed through the guide plates 64 and 64.
', guide rollers 65, 65', guide plates 66, 66'
You will be guided to the information board 5 via the .

Next, the operation of the branching device for the copy paper transport path in the copying machine with the above configuration will be explained.First, as shown in FIG. Feed the paper.

The fed copy paper is transferred to the guide plates 3, 5 and the guide roller 6.
, 6', guide rollers 8, via guide plates 7, 7',
The photosensitive layer 8' is fed into close contact with the photosensitive layer of the photosensitive laminate 9, and one side thereof is transferred.

The copy paper onto which one side has been transferred is conveyed by a route 23 via a guide plate 24 to fixing rollers 25 and 25'.

The copy paper fixed by the fixing rollers 25, 25' is
As shown in FIG. The copied paper is conveyed by the guide rollers 27 and 28 toward the guide roller 30 and the freely rotating roller 29 of the reversing temporary receiving and reversing section C. In this case, the guide roller 27.
The conveyance direction switching board 40 and the conveyance direction switching follower plate 41 of the conveyance direction switching device B, which are interposed between the guide roller 30 and the free rotation roller 29, are at the position indicated by the solid line, that is, the first rotation position. Because of this, the copy paper moves smoothly through the guide roller 3.
0 and is conveyed toward the freely rotating roller 29. At the same time, the free rotation roller 29 is at the position of the imaginary line due to the actuator 51 being de-energized in advance, so the guide roller 30. The leading edge of the copy paper conveyed to the free rotation roller 29 passes through the gap between the guide roller 30 and the free rotation roller 29, and is received by the guide plate 31, 32, 33 of the temporary receiving and reversing section C for reversal. It will be done.

Then, when the actuator 51 is energized when the rear end of the copy paper is in contact with the guide roller 30 or is located between the guide roller 30 and the freely rotating roller 29, the free rotating roller 29 moves along the imaginary line. Move from the position to the solid line position,
The rear end of the copy paper is held between the guide roller 30 and the rear end of the copy paper.

When the rear end of the copy paper is clamped, the copy paper is moved backwards by the clockwise rotation of the guide roller 30 and the counterclockwise rotation of the freely rotating roller 29, and the copy paper is moved backward to the conveyance direction switching board 40.
It passes above and is conveyed to guide rollers 28°36.

The copy paper that has been reversed by the guide rollers 28, 36 passes through the guide plates 37, 38 of the return path E, the guide rollers 53, 53', and the guide plate 54, shown in FIG. '54', guide rollers 55, 55
', guide plates 56, 56', guide rollers 57, 57'
The copy paper is then conveyed to the paper width aligner 60. The copy paper whose width has been aligned by the copy paper width aligner 60 is transferred to the conveyor roller 61.
1. The tip is conveyed by the stopper 62 and aligned with the stopper 62. Ru.

The copy paper with its leading edge aligned is fed to the paper feed roller 63°63'.
The guide rollers 65 and 6 pass through the guide plates 64 and 64'.
5', and is conveyed to the guide plate 66.66' by the guide roller 65°65', and then to the guide roller 6.6 through the guide plate 5.
’. The copy paper on which one side has been copied is fed by paper feed rollers 63, 63', guide plates 64, 64. ', guide roller 65
, 65', and guide plates 66 and 66', the paper is reversed and transported with the uncopied back side facing up. This inverted copy sheet is guided from guide rollers 6,6' to guide plates 7,7' and conveyed to guide rollers 8.8'.

The uncopied copy paper, which has been conveyed to the guide rollers 8 and 8' with its back side facing up, is transferred to a transfer corona discharger 10.
The back side of the photosensitive P ram 9, which is opposite to the photosensitive P ram 9, is transferred so as to be brought into close contact with the photosensitive layer, and the back surface which has not been copied yet is transferred. After the transfer is completed, the copy paper is sent by the conveyor belt 23 via the guide plate 24 to the fixing roller 25, 25', where it is fixed.

The fixed copy paper is placed on the guide plate 26.2 shown in FIG.
6' to the guide rollers 27' and 28 to the discharge roller 30.
, 34, and the first
It is discharged from the discharge port 35 into the copy receiver 59 via the guide plates 58, 58' shown in the figure. In this way, double-sided copying is completed. In this case, the i general feed direction switching board 40 and the conveyance direction switching follower plate 41 of the first general feed direction switching device B are operated by de-energizing the actuator 44 in advance as shown in FIG. 2, the copy paper sent out from the guide rollers 27 and 28 smoothly passes between the conveyance direction switching board 40 and the conveyance direction follower plate 41 and is transferred to the discharge roller. 30.34.

"Effects of the Present Invention" According to the present invention, when the conveyance direction switching device is in the first rotational position, the exit of the forward path and the entrance of the return path are connected to the entrance of the reversing temporary receiving and reversing section. In addition to communicating,
In the second rotational position, the outlet of the progressive path is configured to communicate with the inlet of the ejecting device, so there is no need to provide a guide plate between the outlet of the progressive path and the inlet of the extraction device. , the number of parts can be saved and the configuration can be simplified.

The transport direction switching device is composed of a transport direction switching board and a transport direction switching follower plate, the transport direction switching board and the transport direction switching follower plate facing each other and being separated from each other, and In addition to forming a copy paper transport path with a constant interval between the two sides, the transport direction switching board and the transport direction follower plate are designed to rotate together, so the transport direction switching device can be rotated to move the copy paper. Even when the copy paper is transported, the copy paper transport path within the transport direction switching device is always the same, so the copy paper advances smoothly and does not cause malfunctions such as paper jams, and the transport of the copy paper is stable. There is.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal section of a copying machine incorporating a branching device for a copy paper transport path in a copying machine according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the branching device for a copy paper transport path, and FIG. FIG. 2 is a perspective view of a main part, and FIG. 4 is an explanatory diagram of a conventional copy paper conveyance path branching device. A...Progressive path, B...Conveyance direction switching device, C...Reversing-standby/reverse section, D...
...Discharge device, E...Return path, 25.25' ...Fixing roller, 27.28
...Guide roller, 40...Transportation direction switching board, 41...Transportation direction switching follower plate.

Claims (1)

[Claims] A progressive path A for conveying the copy paper sent from the fixing rollers 25, 25' toward the conveyance direction switching device B, and after temporarily receiving the copy paper sent from the conveyance direction switching device B. It has a reversing temporary receiving and reversing section C for reversing, and an entrance section adjacent to the inlet/output section of this reversing temporary receiving and reversing section C, and transfers the copy paper sent from the conveyance direction switching device B to the outside of the copying machine. It has a discharge device D that discharges the copy paper to the feed path A, and an entrance portion adjacent to the exit portion of the progressive path A, and returns the copy paper sent from the conveyance direction switching device B toward the conveyance path immediately after the sheet is fed. guide rollers 27 and 28, which are disposed at the exit of the progressive path A and feed the copy paper sent from the progressive path A toward the conveyance direction switching device B; and,
Guide rollers 28 and 36 are disposed at the entrance of the return path E, and guide rollers 28 and 36 are provided to draw in the copy paper sent from the transport direction switching device B and send it to the return path E, and the transport direction switch Device B includes a transport direction switching board 40 which is rotatably supported with respect to the copying machine main body, and a transport direction switching board 40 facing away from the copy paper transport surface of the transport direction switching board 40. 40, and a conveyance direction switching follower plate 41 that rotates integrally with the conveyance direction switching board 40 while forming a copy paper conveyance path between the forward conveyance path A and the forward conveyance path A in the first rotational position. and the entrance of the return path E are communicated with the entrance and exit of the temporary reversing receiving and reversing section C;
A branching device for a copy paper conveyance path in a copying machine, configured to communicate an outlet of the progressive path A with an inlet of the discharge device D in a second rotational position.