JPS61112164A - Copying device - Google Patents

Abstract

PURPOSE:To invert copying paper in a short copying paper passage by inverting the copying paper on the basis of the switch-back method and carrying the inverted copying paper from the back of intermediate copying paper receiving boards to a receiving board. CONSTITUTION:The 2nd movable guide plate 108 is arranged as the 2nd movable guide means between a copying paper inverting means 20 and the intermediate copying paper receiving boards 102, 102. The guide plate 108 is carried by a shaft 59 so as to be rotated between the upper position (shown by a solid line) and the lower position (shown by a virtual line). When the guide plate 108 is located on the upper position, the guide plate 108 guides the copying paper towards the 2nd intermediate copying paper receiving board 103, and at the lower position, guides the copying paper towards the 1st intermediate copying paper receiving board 102. When the copying paper carried to a switch- back guide part 109 is detected 111, a pair of rollers 110 are rotated in the reverse direction against the arrow and the copying paper is inverted at its advancing direction on the basis of the switch-back method and while being guided by the guide plate 108 located on the dotted position, carried to the 1st board 102 from its back.

Description

[Detailed description of the invention] (Technical field)) The present invention relates to a copying apparatus having a single-sided copying function.

(Prior Art) In a copying apparatus using electrophotography, it has been thought to perform so-called double-sided copying, in which copy images are formed on both the front and back sides of a sheet of copy paper (transfer paper). Furthermore, various copying apparatuses have been proposed for achieving such double-sided copying.

In order to perform such double-sided copying, the above copy paper must be
The paper is sent to a copy processing unit including a photosensitive drum, etc., and after a copy image is formed on one side, it must be reversed and sent to the copy processing unit again. Therefore, it has a single-sided copying function. In many cases, a copying device includes a so-called paper feed stack table that can store new copy paper in a stacked manner, and paper sheets that are taken out from the paper feed stack table and fed to the copy processing section, where a copy image is formed on one side. It includes a so-called intermediate copy paper holder for taking in copy paper with its front and back sides reversed and storing it while it is sent to the copy processing section again in the next process. That is, when performing double-sided copying using the method described above, at least two copy paper storage tables are required.

When performing single-sided copying, if there are two copy paper storage trays, two different sizes of copy paper can be preset, and one of the different paper sizes can be selectively taken out by switching operation using a lever, etc. However, when making single-sided copies, even if two copy storage stands are provided,
Only one type of copy paper size can be preset, and in order to make double-sided copies using copy paper of different paper sizes, the size of each copy paper storage section can be variably adjusted according to the paper size of the copy paper. It needs to be configured so that it can be done. However, even if the copy paper storage stand is configured to be variable adjustable so that copy paper of different sizes can be stored, it is still necessary to replace and adjust the copy paper each time the paper size changes. In practice, it is inevitable that this will result in a time loss, and the adjustment is a relatively troublesome task since the two copy paper storage stands must be adjusted in the same way. To solve this problem, it is sufficient to prepare a plurality of copy paper storage stands corresponding to paper sizes.

By the way, as described above, once the copy paper has been copied on one side, it is not possible to copy on the other side unless the front and back sides of the copy paper are reversed, so it is necessary to flip the copy paper.

In this case, it is necessary to invert the copy paper so as not to put any strain on it.

Furthermore, the copy paper with a copy image formed on one side and once stored in the intermediate copy paper holder is fed again in order to form a copy image on the other side.

At this time, the copy paper is required to be fed stably.

(Purpose) The present invention has been proposed in view of the various problems required in conventional copying devices equipped with a double-sided copying function. It is an object of the present invention to provide a copying device that does not require any adjustment work when taking out different types of copy paper, can easily reverse the copy paper, and can stably feed copy paper from an intermediate copy paper holder. do.

(Structure) Hereinafter, the present invention will be described in detail based on an illustrated embodiment.

The attached figure is a schematic diagram showing one embodiment of a copying apparatus according to the present invention. In the figure, numeral 1 is.

2 shows an outer casing of a copying apparatus, and numeral 2 indicates a photosensitive drum rotatably supported on a shaft 3 within the outer casing 1. A copy paper feeding device 4 is disposed on the right side of the photosensitive drum 2 in the drawing for feeding copy paper sheet by sheet toward the photosensitive drum 2.

The copy paper feeding device 4 includes first and second copy paper storage cassettes 100 and 101, which serve as paper stack stands, arranged in two stages, upper and lower, at the lower right side of the outer casing 1. These copy paper storage cassettes 100, 101
is detachably attached to the cassette mounting portion, which consists of a slit-shaped cassette mounting window formed in the outer casing 1, a cassette bottom support member that supports the bottom of the cassette, an abutment mover for abutting the front wall of the cassette, etc. It is installed.

The first copy paper storage cassette 100 is a rectangular box with an open top for stacking and storing, for example, A-copy paper in four sizes. The second copy paper storage cassette 101 is a rectangular box with an open top for stacking and storing, for example, B row 4 size copy papers. Each cassette 100, 101 is
Copy paper stored in each can be taken out starting from the highest one. Above the first copy paper storage cassette 100 is a first feeding port roller 104, and above the second copy paper storage cassette 101 is a second feeding roller 10.
5 are arranged respectively, and each of the copy sheets stored in each cassette is taken out one by one by each feeding roller, starting from the topmost one.

Each feed roller 104, 105 is supported by an end of a swingable support lever.

At the upper left of the first copy paper storage cassette 100, there are a first intermediate copy paper holder 102 and a second intermediate copy paper holder 1.
03 are arranged respectively. These paper trays are configured such that copy paper with a copy image formed on one side thereof is selectively fed from the rear of each paper tray. have. A third feed roller 106 supported by a swingable support lever is disposed above the first intermediate copy paper holder 102 . A fourth feed roller 107 supported by a swingable support lever is arranged above the second intermediate copy paper holder 103. Each of these rollers feeds the copy paper fed into each paper tray after single-sided copying has been completed.

The copy paper taken out from the first and second copy paper storage cassettes 100 and 101 is conveyed toward the photosensitive drum 2 by a copy paper conveying device described below, and then the intermediate copy paper receiving joint is transferred to the outer casing 1. The paper is sent toward a paper discharge stack stand 30 provided outside.

The copy paper conveyance device includes a first copy paper storage cassette 100.
and a pair of rollers 43 and 39 located in front of the second copy paper storage cassette 101, that is, on the left side in the figure, and conveying the fed copy paper toward the pair of registration rollers 34.
A copy paper path 38 having a copy paper path 38 and a copy paper path 38 located in front of the first intermediate copy paper holder 102 and the second intermediate copy paper holder 103 transport the fed-out copy paper after single-sided copying toward the pair of registration rollers 34. a copy paper path 33 having a pair of rollers 35 that rotate the copy paper path 33; The registration roller pair 34 is as well known.

This serves to synchronize the feeding timing of the copy paper sent toward the photosensitive drum 2 with the rotation of the photosensitive drum 2. The copy paper sent out from the registration roller pair 34 passes through a copy paper path 46 and reaches the photosensitive drum 2.
and a transfer device 47 disposed opposite to the outer peripheral surface of the photoreceptor drum. The transfer device [47 is for transferring the toner image on the surface of the photosensitive drum 2 onto copy paper, and is not limited to the roller transfer method shown in 1, but may also be a charger method that performs corona discharge with a polarity opposite to that of the toner image. The copy paper onto which the toner image has been transferred is peeled off by a peeling claw 48 and then sent to a fixing device 53 by a separation conveyance belt 51. The fixing device 53 functions to substantially permanently fix the toner image transferred to the copy paper. The fixing device is not limited to a roller fixing method and may be of any other type. A discharged copy paper path 54 is configured on the copy paper sending side of the fixing device 53. The discharged copy paper path 54 includes a fixed guide plate 55, a first movable guide plate 58 as a first movable guide provided below the fixed guide plate 55, and a pair of transport rollers 112. It consists of a pair of paper ejection rollers 63. The first movable guide plate 58
7, and is provided so as to be vertically displaceable between an upper position shown by a solid line and a lower position shown by a phantom line in FIG. When in the lower position, this first movable guide plate 58 allows the copy paper from the fixing device to advance to the output stacking platform 30, whereas when in the upper position, the first movable guide plate 58 allows the copy paper to be transferred to the copy paper inversion described below. Means 20
It is designed to guide you to.

The copy paper path formed when the first movable guide plate 58 is in the upper position shown by the solid line is located at the first intermediate copy paper tray 10.
2 and a second intermediate copy paper holder 103. A copy paper reversing means 20 is arranged in this copy paper path. The copy paper reversing means 20 includes a pair of forward/reverse rollers 110 that rotates in the normal direction when receiving the copy paper after single-sided copying, and rotates in the reverse direction when sending out the copy paper from the intermediate copy paper holder.

a switchback guide section 109 that guides copy paper;
It is located deep inside this switchback guide section,
It consists of a detector 111 which outputs a signal to reverse the roller pair 110 when copy paper is detected, and the copy paper is reversed in a switchback manner.

Copy paper reversing means 20 and each intermediate copy paper holder 102.
A second movable guide plate 108 serving as a second movable guide means is arranged between the movable guide plate 103 and the second movable guide plate 103 . Second movable guide plate 108
is carried by a shaft 59 and is rotatably provided between an upper position shown by a solid line in FIG. 1 and a lower position shown by a phantom line. When the second movable guide plate 108 is located at the upper position, it guides the copy paper toward the second intermediate copy paper tray 103, and when it is located at the lower position, it guides the copy paper toward the first intermediate copy paper tray. It is designed to guide you towards the cradle. This second movable guide plate 108
The switching position of the first movable guide plate 58 will be explained in the operation description below.

First, a case will be described in which top-side copying is performed on A-column 4-size copy paper stored in the first copy paper storage cassette 100. When a command to perform double-sided copying on the copy paper stored in the first copy paper storage cassette 100 is given to the control unit (not shown) of the copying device, the first movable guide plate 58 is moved as indicated by the solid line in FIG. At the upper position, a second movable guide plate 1
08 are each rotated to the lower position shown by the chain line in the figure.

Further, the pair of forward and reverse rollers 110 of the copy paper reversing means 20 is rotationally driven in the direction of the arrow. Then, the third feeding port roller 104 rotates and sends out the A-row 4-size copy paper stored in the first copy paper storage cassette 100 to the outside of the cassette.

Conveyance roller pair 43, 39. Copy paper passage 38, registration roller pair 34. Photosensitive drum 2 via copy paper path 46
The toner image is transferred between the drum surface and the transfer means 47, where it is brought into close contact with the drum surface in the area where the toner image is formed, and the toner image is transferred thereto. After the toner image is transferred to the copy paper, the copy paper is peeled off from the drum surface and sent to the fixing device 53 by the one-separation conveyor belt 51, where the toner image is fixed. At this time, since the first movable guide plate 58 is located at the upper position and the second movable guide plate 108 is located at the lower position, the copy paper that has been fixed is guided by these plates and the copied image is The copy sheet is fed into the copy paper reversing means 20 by a pair of rollers 110 rotating normally in the direction of the arrow with the surface on which it is formed facing upward. The copy paper fed into the switchback guide section 109 is detected by the detector 11.
1, the forward/reverse rotation roller pair 110 is rotated in the opposite direction to the arrow by the signal outputted by this. Then, the copy paper that has entered the switchback guide section 109 is reversed in its traveling direction in a switchback manner, and the second movable guide plate 10 is placed at the lower position shown by the chain line.
8 and fed into the first intermediate copy tray 102 from behind. In other words, the copy paper fed into the first intermediate copy paper tray 102 is stored with the copy image formed on one side facing upward. At this time, the third feed roller 106.

It is retracted to the upper position shown by the solid line so that it does not obstruct the entry of copy paper. The copy paper fed into the first intermediate copy paper tray 102 is stored with its leading edge abutting against the front wall 102a of the paper tray.

As described above, copy paper is taken into the first intermediate copy paper holder 102, and when it is time to send out the copy paper, the third feed roller 106 descends to the lower position as shown by the chain line to release the copy paper. is fed toward the transport roller pair 35. At this time, the first movable guide plate 58 is rotated to the lower position shown by the chain line.

The copy paper is transported through a copy paper path 33 by a pair of transport rollers 35.
The photosensitive drum 2 is transferred to the photosensitive drum 2 again by the registration roller pair 34.
The paper is fed into the copy paper path 46 in synchronization with the copy paper path 46. Then, the side of the copy paper on which the copy image is not formed is placed on the photoreceptor drum 2.
, and another copy image is transferred onto that surface. This copy paper.

It is sent to a fixing device 53 by a separation conveyance belt 51, and the toner image transferred immediately before is fixed thereon. At this time,
Since the first movable guide plate 58 is at the chain line position, the copy paper that has been fixed is guided toward the pair of transport rollers 112 in the ejected copy paper path 54, and is guided through the pair of ejecting rollers 63 and the ejecting port 64. After that, the paper is discharged onto the discharge stack table 30.

Next, when double-sided copying is performed using copy paper of the B row 4 size paper, the second feed roller 105 is operated, and the copy paper stored in the second copy paper storage cassette 101 is transferred to the transport roller. All you have to do is send it towards vs. 43. In addition,
This copy paper is also once transferred to the copy paper reversing means 20 in the same manner as described above.
When the copy paper is reversed and sent out from the guide section, the second movable guide plate 10g is rotated to the upper position shown by the solid line, and the copy paper is fed into the switchback guide section 109. The paper is guided toward the second intermediate copy paper tray 103.

In addition, when receiving copy paper, the fourth feed roller 1
07 is retracted to the solid line position, and the copy paper is fed from the rear of the second intermediate copy paper receiver 103 and its front edge is brought into contact with the front wall 103a, which is the same as the above-mentioned operation.

In the above-mentioned embodiment, two different sizes of copy paper can be preset, but when copying is performed using a new copy paper of a different paper size, the copy paper storage cassette and the copies fed from this cassette can be preset. The intermediate copy paper holder that temporarily stores paper, for example, the second copy paper storage cassette 101 and the second intermediate copy paper holder 103, can both be replaced with ones compatible with different paper sizes. It would be advantageous to have a structure in which the intermediate copy paper holder can also be replaced in conjunction with replacement.

(Effects of the Invention) As described above, according to the present invention, copy paper is reversed in a switchback manner and the reversed copy paper is fed into the intermediate copy paper holder from the rear of the intermediate copy paper holder.
When the copy paper is reversed, the copy paper is not strained, and furthermore, the copy paper can be reversed in a relatively short copy paper path.

[Brief explanation of the drawing]

The figure is a schematic configuration diagram showing an embodiment of a copying apparatus according to the present invention. 2... Photosensitive drum, 30... Paper discharge stack stand,
58... First movable guide means, 100... First paper feed stack stand, 101... Second paper feed stack stand, 102...
. . . first intermediate copy paper holder, 103 . . . second intermediate copy paper holder, 108 . . . second movable guide means.

Claims (1)

[Scope of Claim] A copying apparatus equipped with a double-sided copying function includes a plurality of paper feed stack stands each storing copy sheets of different sizes, and uncopied copies stored in these paper feed stack stands. A plurality of paper feed rollers that send out paper, a discharge stacking table that receives copy paper after double-sided or single-sided copying, and a copy paper path between the paper feed stacking table and the discharged paper stacking table. Copy sheets of different sizes are arranged in the same number corresponding to a plurality of paper stacking tables, and are selectively fed out from each of the paper stacking tables.
an intermediate copy paper holder that accepts it from the rear; and a first movable member that selectively switches between guiding the copy paper after single-sided copying to the paper discharge stack holder or toward the intermediate copy paper holder. a guide means, and a switch disposed in a copy paper path between the first movable guide means and the intermediate copy paper holder, the copy paper being sent toward the intermediate copy paper holder after single-sided copying is sent to the intermediate copy paper holder. a copy paper reversing means for inverting the copy paper in a backward manner and feeding the copy paper from behind to the intermediate copy paper holder; A second movable guide means for guiding toward an intermediate copy paper tray corresponding to the paper stack tray, and a feeding roller for feeding out the copy paper stored in the intermediate copy paper tray after single-sided copying has been completed. A copying device characterized by: