JPS62105828A - Electrostatic copying machine - Google Patents

Abstract

PURPOSE:To eliminate the waste of copy papers by discharging the copy paper in a copy paper re-sending passage after the completion of back copying even if all clear signals are sent to the input of a device for selectively copying one side or double sides of the copy paper. CONSTITUTION:When an all clear key 158 on a control board 144 is depressed for initialization, an all clear signal is generated in a control section. And when this copier detects special conditions, for example, operation of a magnification setting mechanism and abnormal conditions, for example, defective operation due to jam or continuation of printing a specified number of copy papers, then the all clear signal is not received. Next, when said conditions are cancelled and the all clear signal is received, then the copier is initialized to return all copying requirements set by the former user to usual conditions. Then, the copy paper received in a copy paper re-sending means is discharged after the completion of copying the back. Thus, the waste of copy paper is eliminated for initialization.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an electrostatic copying apparatus, and more particularly to an electrostatic copying apparatus capable of forming images on both sides of copy paper as necessary.

Background Art> From the standpoint of saving copy paper and reducing the number of documents to be stored, it is often desirable to form images on both sides of copy paper. Electrostatic copying devices capable of forming images on both sides of paper have been proposed and put into practical use.

A typical example of such an electrostatic copying device includes a copy paper conveyance path,
a copy paper supply means for supplying a sheet of copy paper to the copy paper conveyance path; a conveyance control means disposed adjacent to the downstream end of the copy paper conveyance path; a copy paper discharge path extending from an adjacent upstream end; a copy paper reversing path extending from an upstream end adjacent to the downstream end of the transport control means; and a copy paper return path extending from an upstream end adjacent to the upstream end of the transport control means. a copy paper resupply route; and copy paper refeeding means for resupplying copy paper returned through the copy paper return route to the copy paper transport route through the copy paper resupply route. The conveyance control means includes a lower movable guide member and an upper movable guide member that define a copy paper movement path between them. The lower movable guide member and the upper movable guide member have an elevated position that communicates the downstream end of the copy paper conveyance path with the upstream end of the copy paper ejection route, and the downstream end of the copy paper conveyance path and the copy paper. and a lowered position for communicating with the upstream end of the reversal path.

In the electrostatic copying apparatus as described above, an image is formed on one side of the copy paper while the copy paper is fed from the copy paper supply means to the copy paper conveyance path and is conveyed through the copy paper conveyance path. When it is desired to form an image on only one side of the copy paper, the copy paper with the image formed on one side is moved between the lower movable guide member and the upper movable guide member positioned at the lowered position. The copy paper is introduced into the copy paper ejection path through the copy paper movement path between the two, and is then ejected through the copy paper ejection path. On the other hand, when it is desired to form images on both sides of the copy paper, the copy paper with the image formed on one side is moved between the lower movable guide member and the upper movable guide member positioned at the ascending position 1. The copy paper is introduced into the reversing path through the copy paper movement path between the two. Next, after the trailing edge of the copy paper has passed the downstream end of the copy paper transport path, the moving direction of the copy paper is reversed, the copy paper is introduced into the copy paper return route, and the copy paper is sent through the copy paper return route to the copy paper refeeding means. It will be sent back. Thereafter, the copy paper is re-supplied from the copy paper re-feeding means to the copy paper transport route through the copy paper re-supply route. Then, while the copy paper is being conveyed again through the copy paper conveyance path, an image is formed on the other side of the copy paper. Thereafter, the copy paper with images formed on both sides is introduced into the copy paper ejection path through the copy paper moving path between the lower movable guide member and the upper movable guide member positioned in the lowered position, and then the copy paper is introduced into the copy paper ejection path. The paper is ejected through the paper ejection path.

In addition, in the electrostatic copying apparatus described above that can form images on both sides of copy paper, in addition to the normal first screen copying mode, a second screen copying mode (so-called continuous copying double-sided mode) is selectively operated. There are also some that can be copied. That is, the first
In the screen copying mode, the original placed on the original placing means is copied onto one side of the copy paper while being conveyed from the copy paper supply means through the copy paper transport path, and then the original to be copied is replaced. While the original newly placed on the original placing means is conveyed from the copy paper refeeding means through the copy paper conveying path again, the image is copied onto the other side of the copy paper with the image formed on one side, and thus the image is different. The original is copied onto both sides of the copy paper. On the other hand, in the second screen copying mode, one side of the original placed on the original placing means is placed on one side of the copy paper while being conveyed from the copy paper supply means through the copy paper transport path. While the other of the two parts of the original that has been copied and then placed on the original placing means is conveyed from the copy paper refeeding means through the copy paper conveying path again, the copy paper with an image formed on one side is In this way, one side and the other of the two halves of the same original are copied on both sides of the copy paper, and is suitably used, for example, when making a screen copy of an original such as a book.

However, the conventional electrostatic copying apparatus as described above has the following problems to be solved.

First, in the above-mentioned electrostatic copying device capable of screen copying, in addition to the print key for starting a copying operation, -C is also an initialization key for initializing the device (setting it to normal copying mode). and an ejection key for ejecting the copy paper received by the copy paper refeeding means out of the housing. When the device is completely initialized, initialization of the device is achieved by operating the initialization key, and if the copy paper is received by the copy paper refeeding means in the initialized state, further By operating the ejection key, the copy paper present in the copy paper refeeding means is ejected out of the housing, thus achieving complete initialization of the device.

However, in conventional electrostatic copying machines, in order to completely initialize the machine, it is necessary to operate both the initialization key and the eject key, which makes the operation complicated, and the operator has to operate both the initialization key and eject key. If you forget to operate one of the keys, the following inconvenience will occur.

In other words, if you forget to operate the initialization key, the initialization of the device will not be achieved and copies will be made in the copy mode set in the previous copy operation, and the copies intended by the operator will not be obtained. This results in unnecessary copying. In addition, if you forget to operate the eject key, enter the next new copying operation with the copy paper present in the copy paper refeeding means, and therefore, if you set the screen copy mode in the new copying operation, Then, the copy sheet for a new copying operation is received on top of the copy sheet accepted by the copy sheet retransfer means in the previous copying operation.

Second, in electronic copying devices capable of copying screens in the first screen copying mode and the second screen copying mode, in general, in addition to the print key, there is also a clear stop key for stopping the copying operation. A key is provided. When the copying operation is to be terminated in the middle of the copying operation, the copying operation can be terminated without initializing the apparatus by operating the clear/stop key. That is, when the clear/stop key is operated in the first screen copying mode, the copying operation ends and that state is maintained. Furthermore, if the clear/stop key is operated in the first supply state in which copy paper is supplied from the copy paper supply means in the second screen copying mode, the copying operation ends and the copy paper is supplied to the copy paper refeeding means. If the copy paper is accepted, the copy paper is further ejected from the housing without being copied on the other side, this state is maintained, and the copy paper is further supplied from the copy paper refeeding means in the second screen copy mode. If the clear/stop key is operated while in the second supply state, the copying operation ends and that state is maintained.

However, in the conventional electrostatic copying apparatus described above, when the clear/stop key is operated in the first supply state in the second screen copying mode, the copy paper received by the copy paper refeeding means is removed. Since it is ejected from the housing without being copied on the other side, it often goes against the operator's intention.

More specifically, in the second screen copy mode (so-called quick copy duplex mode), one of the two halves of the original to be copied is copied onto one side of the copy paper, and the other halves of the original are copied onto one side of the copy paper. Therefore, when the operator sets the second screen copy mode, it is intended to be a copy with the desired copy made on both sides of the copy paper, which is different from the conventional If only one side of the copy paper is copied, this goes against the operator's intention, and the copies are often wasted.

<Objects of the Invention> A first object of the present invention is to provide an electrostatic copying apparatus that can achieve complete initialization of the apparatus with a simple operation and can prevent operational errors by the operator.

A second object of the present invention is to provide an electrostatic copying apparatus that can produce copies that more closely match the operator's intentions.

Other objects of the invention will become apparent from the subsequent description with reference to the accompanying drawings.

<Summary of the Invention> According to the present invention, an electrostatic copying apparatus that achieves the first object described above includes an image forming means, a copy paper conveyance path, and a method for supplying sheet-like copy paper to the copy paper conveyance path. a copy paper supplying means, a copy paper return route, a copy paper resupply route, a copy paper receiving unit that receives copy paper returned through the copy paper return route, and transports the received copy paper through the copy paper resupply route. and a copy paper refeeding means for re-feeding the copy paper to the copy paper conveyance path, and while the copy paper supplied from the copy paper supply means to the copy paper conveyance path is conveyed through the copy paper conveyance path, the image forming An image is formed on one side of the copy paper by the action of the means, and the copy paper with the image formed on one side is selectively introduced into the copy paper return path through the copy paper return path. The copy paper is then returned to the copy paper conveyance path from the copy paper refeeding means through the copy paper resupply path, and while being reconveyed through the copy paper conveyance path, the copy paper is In an electrostatographic apparatus of the type in which an image is formed on the other side; comprising control means for controlling the apparatus, the control means comprising:
When an all-clear signal is generated and accepted by the control means, the apparatus is initialized based on the all-clear signal, and if the copy paper is received by the copy paper retransmission means, the copy paper is retransmitted. activating the means, thereby initializing the copy paper received by the copy paper refeeding means to be ejected out of the housing through the copy paper refeed path and the copy paper transport path; A copying device is provided.

According to the present invention, an electrostatic copying apparatus that achieves the second object described above includes an image forming means, a copy paper conveyance path, and a copy paper for supplying sheet-like copy paper to the copy paper conveyance path. a supply means, a copy paper return route, a copy paper resupply route,
a copy paper refeeding means for receiving copy paper returned through the copy paper return route and resupplying the accepted copy paper to the copy paper transport route through the copy paper resupply route; While the copy paper supplied from the means to the copy paper conveyance path is conveyed through the copy paper conveyance path, an image is formed on one side of the copy paper by the action of the cough image forming means, and the image is formed on one side. The formed copy paper is selectively introduced into the copy paper return path, and is returned to the copy paper refeeding means through the copy paper return route, and then from the copy paper refeeding means through the copy paper resupply route, the copy paper is The copy paper is re-supplied to the paper conveyance path, and an image is formed on the other side of the copy paper by the action of the image forming means while being re-conveyed through the copy paper conveyance path, and furthermore, in the first screen copying mode, A desired original is copied onto one side of the copy paper while being conveyed from the copy paper supply means through the copy paper conveyance path, and the copy paper (while being conveyed through the shipping route) is copied from the copy paper retransmission means again. A document different from the desired document is copied onto the other side of the copy paper, while in the second screen copy mode, the desired document is transferred from the copy paper supply means through the copy paper transport path. One of the two halves of the desired original is copied onto one side of the copy paper, and while the desired original is conveyed from the copy paper refeeding means through the copy paper transport path again, the other of the two halves of the desired original is copied onto the other side of the copy paper. an electrostatic copying apparatus of the type in which copies are made; comprising a control means for controlling the image forming means, the copy paper supply means, and the copy paper refeeding means, the copy paper supply in the second screen copying mode; When a clear stop signal is generated and accepted by the control means during the first supply state in which copy paper is supplied from the means to the copy paper transport path, the control means performs a clear stop signal based on the clear stop signal. to temporarily end the copying operation, and if the copy paper is received by the copy paper refeeding means, then to activate the copy paper refeeding means and to bring the image forming means into an image forming state;
As a result, the copy paper received by the copy paper refeeding means is re-supplied to the copy paper transport path through the copy paper resupply path, and while being transported through the copy paper transport path, the desired document is divided into two parts. the other side of the copy paper is copied onto the other side of the copy paper by the action of the image forming means, and then the re-supplied copy paper is ejected from the housing;
<Preferred Embodiment of the Invention> Where an Electrostatic Copying Apparatus is Provided Hereinafter, an example of an electrostatic copying apparatus constructed according to the present invention will be described with reference to the accompanying drawings.

Tomo 11 Kinpeki 41”! FIG. 1 schematically illustrates the main components of one embodiment of an electrostatographic reproduction apparatus constructed in accordance with the present invention. The electrostatic copying apparatus shown in FIG. 1 includes a housing 2 having a substantially rectangular parallelepiped shape. On the upper surface of the housing 2, there is a stationary transparent plate 4 on which a document to be copied (not shown) is placed, and a document that can be opened and closed to cover the transparent plate 4 and the document placed thereon. A pressing member 6 is provided.

A rotary drum 8 having an electrostatic photoreceptor on its circumferential surface is rotatably mounted approximately in the center of the housing 2 . A charging area 12, an exposure area 14, a developing area 16, a transfer area 18, and a cleaning area 2o are defined around the rotating drum 8, which is rotationally driven in the direction shown by the arrow 10, in order when viewed in the direction shown by the arrow 10. has been done. A charging corona discharger 22 is provided in the charging area 12, a developing device 24 is provided in the developing area 16, and a transfer corona discharger 26 and a stripping corona discharger 28 are provided in the transfer area 1. A static eliminating lamp 30 and a residual toner removing blade 32 are provided in the cleaning area 20.

An optical system, generally designated by the number 34, is disposed above the rotating drum 8. This optical system 34 includes a movable original illumination lamp 36, a first movable reflecting mirror 38, and a second movable reflecting mirror 4.
0, a third movable reflector 42, a lens assembly 44, and a stationary reflector 46. During scanning exposure, the movable document illumination lamp 36 and the first movable reflector 38 are moved substantially horizontally from left to right in FIG. The mirror 40 and the third movable reflecting mirror 42 are moved substantially horizontally from left to right in FIG. 1 at half the required speed. At this time, the document placed on the transparent plate 4 is illuminated by the movable document illumination lamp 36, and the light reflected from the document is reflected from the first document. Second and third movable reflector 38.40 and 4
2 and reaches the lens assembly 44, and then reflected by the stationary reflector 46 and projected onto the photoreceptor in the exposure area 14. When the scanning exposure is completed, the movable original illumination lamp 36 and the first . Second and third reflecting mirror 3
8. 40 and 42 are moved from right to left in FIG. 7 and returned to their original positions.

At one end of the housing 2, that is, at the right end in FIG. 1, there is provided copy paper supply means, generally indicated by the numeral 48. The illustrated copy paper supply means 48 includes the lower cassette receiving portion 5
0a, an intermediate cassette receiving part 50b, and an upper cassette receiving part 50c. The lower cassette receiver 50a1, the intermediate cassette receiver 50b, and the upper cassette receiver 50c include
One of several types of copy paper cassettes 52 each containing sheet-like copy paper of different sizes is selectively and detachably mounted. Each of the lower cassette receiver 5Qa, the intermediate cassette receiver 50b, and the upper cassette receiver 50c includes delivery rollers 54a, 54b, and 5 for delivering copy paper sheet by sheet from the copy paper cassette 52 installed therein.
4C is installed. Copy paper sent out from the copy paper cassette 52 mounted on the lower cassette/tray receiving section 50a is introduced into a copy paper conveyance path generally designated by numeral 58 through a copy paper feed path 56a. Intermediate cassette receiver 50
The copy paper sent out from the copy paper cassette 52 attached to the copy paper cassette 52 is introduced into the copy paper transport path 58 through the copy paper feed paths 56b and 56a. The copy paper sent out from the copy paper cassette 52 attached to the upper cassette receiving portion 50c is passed through a copy paper feeding path 56c.

It is introduced into the copy paper transport path 58 through 56b and 56a. The copy paper feeding route 56a is defined by the upstream part of the guide plate 60 and a part of the guide plate 62, the copy paper feeding route 56b is defined by a pair of guide plates 64, and the copy paper feeding route 56C is defined by a pair of guide plates 64. is defined by a pair of guide plates 66. A pair of feeding rollers 68 is disposed between the second end of the copy paper feeding path 56a and the downstream end of the copy paper feeding path 56b, and a pair of feeding rollers 68 are disposed between the upstream end of the copy paper feeding path 56b and the downstream end of the copy paper feeding path 56b. A pair of feed rollers 69 is disposed between the feed path 56e and the downstream end thereof.

The copy paper conveyance path 58 extends from an upstream end 70 to a downstream end 72.
It extends substantially horizontally from right to left in FIG. The copy paper conveyance path 58 includes copy paper conveyance means, that is, in the illustrated example, a downstream portion of the guide plate 60 and a downstream portion of the guide plate 74, a pair of conveyance rollers 76, a pair of guide plates 78,
A pair of conveyance rollers 80, a guide plate 82, the transfer area 18 (that is, between the rotating drum 8 and the corona discharge 26 for transfer and the corona discharge 28 for peeling), a conveyance belt mechanism 84, a guide plate 86,
It is defined by a pair of heating and fixing rollers 88 , a pair of guide plates 90 and a pair of transport rollers 92 .

Adjacent to the downstream end 72 of the copy paper transport path 58.

A transport control means 94 is provided. This conveyance control means 94 includes a lower movable guide member 98 and an upper movable guide member 100 defining a copy paper movement path 96 therebetween. The lower movable guide member 98 and the upper movable guide member 100 are selectively positioned in a lowered position shown by a solid line and a raised position shown by a two-dot chain line. A copy paper ejection path 104 having a pair of ejection rollers 102 is provided downstream of the conveyance control means 94 . A saucer 106 is detachably attached to the other end of the housing 2, that is, the left end in FIG.

Further, in connection with the conveyance control means 94, there are provided a copy paper reversing path, generally designated by numeral 108, and a copy paper return path, generally designated by numeral 110. Information board pair 11
2 extends from the upstream end adjacent to the downstream end of the conveyance control means 94 in an appropriate curved shape. A reversing roller 114 is disposed at the upstream end of the copy paper reversing path 108 and is selectively positioned at a non-operating position shown by a solid line and an active position shown by a two-dot chain line. The copy paper return path 110 extends from the upstream end adjacent to the upstream end of the conveyance control means 94 from the left to the right in FIG. 1 with a slight downward inclination. This copy paper return path 110 includes a copy paper return means, in the illustrated example, a pair of guide plates 115, a pair of return rollers 116, a pair of guide plates 117, a pair of return rollers 118, and a guide plate disposed at the upstream end thereof. 119. As can be easily understood by referring to FIG.
When 0 is positioned at the lowered position indicated by the solid line,
The copy paper transport path 58 and the copy paper discharge path 104 are communicated with each other via a copy paper movement path 96 in the transport control means 94 . On the other hand, when the lower movable guide member 98 and the upper movable guide member 100 are positioned at the raised position shown by the two-dot chain line, the copy paper conveying path 58 and the copy paper reversing path 108
are communicated with each other via a copy paper moving path 96 in the transport control means 94, and a copy paper reversing path 108 and a copy paper return path 110 are connected to the transport control means 94.
They are communicated with each other via a copy paper movement path 96 at.

In the illustrated electrostatic copying machine, a copy paper refeeding means, generally designated by numeral 120, is further provided below the copy paper return path 1i0. This copy paper refeeding means 120 has a copy paper holder 122 that extends substantially horizontally. A copy paper movement blocking means 124 is provided at the front end of the copy paper holder 122, that is, at the right end in FIG. The movement blocking means 124 is selectively positioned at either a blocking position indicated by a solid line or a retracted position indicated by a two-dot chain line.

On the front end of the pedestal 122 is a feeding conveyance roller 126.
is provided. This feed conveyance roller 126 is mounted so that it can freely move upward from the illustrated position where it contacts the top surface of the pedestal 122, and is normally driven by its own weight (by suitable spring means if necessary). It is forced downward by the biasing action.

Further, the entire section extending from the front end of the copy paper refeeding means 120 to the upstream end 70 of the copy paper transport path 58 is designated by the number 12.
A copy paper resupply path indicated at 8 is provided. This copy paper resupply path 128 includes a copy paper resupply means, in the illustrated example, a guide plate 130, a conveyance roller 132 which also performs a copy paper separation function in cooperation with a friction member to be described later, and a resupply roller pair 134. , the guide plate pair 136, and the upstream portion of the guide plate 74.

To summarize the operation of the electrostatic copying machine shown above,
It is as follows.

Rotating drum 8 is rotated in the direction shown by arrow 10,
In the charging area 12, the surface of the photoreceptor on the rotating drum 8 is charged to a specific polarity by the charging corona discharger 26, and in the exposure area 14, the image of the document placed on the transparent plate 4 is exposed to the optical system. 34, the photoreceptor is scanned and exposed, thus forming an electrostatic latent image on the photoreceptor. In the developing area 16, toner is applied to the electrostatic latent image on the photoreceptor by the developing device F24, and the electrostatic latent image is developed into a toner image.

In the transfer area 18, the copy paper conveyed through the transfer area 18 (the conveyance of the copy paper will be further referred to later) is brought into contact with the surface of the photoreceptor, and the transfer corona discharger 2
6, the toner image on the photoreceptor is transferred onto the copy paper. The copy paper is then #IIMed from the photoreceptor by the action of the stripping corona discharger 28. The peeled copy paper is conveyed to a pair of heating and fixing rollers 88 , and the pair of rollers 88
The toner image is fused onto the copy paper as it passes through the paper. On the other hand, in the cleaning area 20, the photoreceptor is irradiated with light from the static elimination lamp 30 to eliminate the residual charge on the photoreceptor, and then the residual toner is removed from the surface of the photoreceptor by the action of the residual toner blade 32. be done.

The conveyance of copy paper will be explained as follows. First, a case will be described in which an image is formed on only one side of copy paper. In this case, the lower movable guide member 98 and the upper movable guide member 100 of the conveyance control means 94 are positioned at the lowered position shown by the solid line. . Lower cassette receiving part 50
a. Middle cassette receiver 50b or upper cassette receiver 5
The copy paper introduced into the copy paper conveyance path 58 from the copy paper cassette 52 installed in the copy paper cassette 0c is conveyed through the copy paper conveyance path 5 days. During this time, a toner image is transferred to one side (i.e., the top side) of the copy paper in the transfer area 18, and the toner image is fixed onto one side of the copy paper by the action of the pair of heated fixing rollers 88. Thus, one side of the copy paper Then, the copy paper is transferred to the copy paper conveyance path 58.
The sheet is then introduced into a copy paper ejection path 104 through a copy paper movement path 96 in a conveyance control means 94, and is ejected into a tray 106 through the copy paper ejection path 104. A copy having an image formed on one side is thus obtained.

When forming images on both sides of the copy paper, first, the lower movable guide member 98 and the upper movable guide member 100 of the conveyance control means f, 4 are positioned at the raised position shown by the two-dot chain line. Next, when the copying process is started, the copy paper introduced into the copy paper transport path 58 from the copy paper cassette 52 attached to the lower force center receiver 50a1, the intermediate cassette receiver 50b, or the upper cassette receiver 50c is Copy paper conveyance path 5
8. During this time, a toner image is transferred to one side (i.e., the top side) of the copy paper in the transfer area 18, and the toner image is fixed onto one side of the copy paper by the action of the pair of heated fixing rollers 88. Thus, one side of the copy paper An image is formed. The copy paper from the copy paper transport path 58 is introduced into the copy paper reversal path 108 through the copy paper movement path 96 in the transport control means 94, and advances in the direction shown by arrow 138 in the copy paper reversal path 108. At this time, the lower surface of the copy paper comes into contact with one side 102a of the pair of ejection rollers 102, which is rotationally driven in the direction shown by arrow 140, but slippage is generated between the ejection roller 102a and the copy paper. Therefore, when copying paper, the roller 102a is
Although it is rotationally driven in the direction indicated by 40,
It is possible to proceed in the direction indicated by arrow 138. When the trailing edge of the copy paper passes through the downstream end of the copy paper transport path 58, that is, the nip area between the transport roller pair 92, the copy paper reverse path 10
A reversing roller 114 provided at the upstream end of the roller 8 is positioned at the operating position shown by the two-dot chain line, thereby pressing the copy paper against one 102a of the pair of ejection rollers 102.

In this way, by the action of the ejection roller 102a which is rotationally driven in the direction shown by the arrow 140, the copy paper is reversed front to back and is advanced in the direction shown by the arrow 142. One side 92a of the pair of conveyor rollers 92 and the pair of guide plates 1 which are rotationally driven in the direction shown by the arrow 140
Copy paper return route 1 passes between one side 116a of 16
10 and proceeds through a copy paper return path 110. The reversing roller 114 in the copy paper reversing path 108 is returned to the non-operating position shown by the solid line at an appropriate time after the copy paper is introduced into the copy paper return path 110.

The copy paper advanced through the copy paper return path 110 is guided onto the pedestal 122 of the copy paper refeeding means 120, and advances on the pedestal 122 to the right in FIG. Then, the feed conveyance roller 126, which is rotated in the direction shown by the arrow 144, acts on the copy paper to further feed the copy paper to the right, thus positioning the leading edge of the copy paper at the blocking position shown by the solid line. C is brought into contact with the movement blocking means 124 located therein.

In this way, the advance of the copy paper is stopped and the copy paper is stopped at a predetermined position on the copy paper refeeding means 120. Even if the feed conveyance roller 126 is rotated in the direction shown by the arrow 144 at this point, the feed conveyance roller 126
A slippage is generated between the paper and the copy paper, and the copy paper is not advanced further.

When the required number of copies are returned to the copy paper refeeding means 120 as described above, the lower movable guide member 98 and the upper movable guide member 100 of the conveyance control means 94 are returned to the lowered position shown by the solid line. Then, the movement blocking means 124 in the copy paper refeeding means 120 is positioned at the retreat position shown by the two-dot chain line, and the copy paper is transferred from the copy paper refeeding means 120 by the action of the feeding roller 126 which is rotationally driven in the direction shown by the arrow 144. is delivered to the copy paper resupply path 128.

The copy paper sent to the copy paper resupply route 128 is advanced sheet by sheet through the copy paper resupply route 128, and
The copy paper is again supplied to the copy paper transport path 58.

As can be easily understood by referring to FIG.
By passing through the paper, the paper is turned upside down and supplied to the copy paper transport path 58 with one side on which an image has been formed facing downward. The copy paper is then transported through a copy paper transport path 58. At this time, the toner image is transferred to the other surface, that is, the upper surface, of the copy paper in the transfer area 18, and the toner image is fixed onto the copy paper by the action of the pair of heat fixing rollers 88, thus forming an image on the other surface of the copy paper. It is formed.

Next, the copy paper is introduced from the copy paper conveyance path 58 through the copy paper movement path 96 in the conveyance control means 94 to the copy paper discharge path 104, and is discharged through the copy paper discharge path 104 into the receiving tray 106. In this way, a copy having images formed on both sides is obtained.

The above-mentioned electrostatic copying apparatus is capable of performing a full-size copy, a first reduced copy having an area ratio of about 0.67, and a first reduced copy having an area ratio of about 0, for example.
．． The structure is configured such that a copy can be generated at a copy magnification arbitrarily selected from among four types of copy magnification, such as a second reduced copy of 5 times and an enlarged copy of about 1.6 times in terms of area ratio, for example. has been done.

In the case of full-size copying, the lens assembly 44 of the optical system 34 is positioned at the position shown by the solid line in FIG. It is located at the position shown by the solid line in FIG. During scanning exposure, the document irradiation lamp 36 and the first movable reflecting mirror 38 are moved at substantially the same speed (2) as the moving speed (2) of the photoreceptor on the rotating drum 8, and the second movable reflecting mirror 38 is Mirror 40 and third movable reflector 42 are moved at a speed of V/2. In addition, in the specific example, the maximum copyable size is JI
S A3 size, therefore, when copying a JIS A3 size original at the same size, the original irradiation lamp 3G, the first movable reflector 38, the second movable reflector 40, and the third movable reflector are used. 42, they are each scanned and moved from the position shown by the solid line in FIG. 1 to the position shown by the two-dot chain line in FIG.

In addition, in the case of the first reduced copy (or second reduced copy), the lens assembly 44 is located somewhat to the right in FIG. 1 from the position shown by the solid line in FIG. In this case, the second movable reflector 40 and the third movable reflector 42 are positioned further to the right in FIG. It is positioned to the left in FIG. 1 (in the case of the second reduced copy, further left in FIG. 1 than in the case of the first reduced copy).

During scanning exposure, the document irradiation lamp 38 and the first movable reflecting mirror 4o are moved at 110.degree. of the moving speed V of the photoreceptor.
82 times (110,67 times), that is, the speed V70.82 (V
)0.67), and the second movable reflecting mirror 40 and the third movable reflecting mirror 42 move at a speed of V/2X0.82 (V/2
x0.67).

Furthermore, in the case of enlarged copying, the lens assembly 44 is positioned somewhat to the left in FIG. 1 from the position shown by the solid line in FIG.
2 is located somewhat to the left in FIG. 1 of the position shown by the solid line in FIG. 1 (a position between the position in the case of a full size copy and the digit 1 in the case of the first reduced copy). During scanning exposure, the document irradiation lamp 38 and the first movable reflector 11
40 is moved at a speed V/1.27, which is 1/1.27 times the moving speed V of the photoreceptor, and the second movable reflecting mirror 40 and the third movable reflecting mirror 42 are moved at a speed V/2X1. Moved in 27.

The electrostatic copying apparatus described above selectively operates in a first screen copy mode (normal screen copy mode) and a second screen copy mode (continuous double-sided copy mode) when copying on both sides of copy paper. mode). Regarding copying in the first screen copying mode and the second screen copying mode, an example will be described in which a copy is made at the same size and is made on JIS AJ size copy paper.

In the case of the first screen copy mode, copy paper supply means 48
An original of a size corresponding to the copy paper supplied from the transparent plate 4 is placed on the transparent plate 4. In this case, the original to be copied is placed with the left end of the transparent plate 4 in FIG.
Covers the left half area in the figure. Then, while the copy paper supplied from the copy paper supply means 48 is conveyed through the copy paper conveyance path 58, the above-mentioned original image is formed on one side of the copy paper. At this time, the original irradiation lamp 36, the first movable reflector 38, the second movable reflector 40, and the third movable reflector 42 are moved from the position shown by the solid line in FIG. It is scanned and moved to the position shown by the chain line. The copy paper with the image formed on one side is then received on the cradle 122 of the copy paper refeeding means 120 as required.

When copying on one side of the copy paper is completed, a new original to be copied in place of the original is again placed on the transparent plate 4 in substantially the left half area in FIG. 1. Then, the copy paper retransmitted from the copy paper retransmission means 120 is transferred to the copy paper conveyance path 58.
While being conveyed through the copy paper, a new image of the document is formed on the other side of the copy sheet that has an image formed on one side. Also at this time, the document irradiation lamp 36 and the first movable reflecting mirror 38,
and a second movable reflecting mirror 40 and a third movable reflecting mirror 42
is scanned from the position indicated by the solid line in FIG. 1 to the position substantially indicated by the dashed-dotted line in FIG. The copy paper with images formed on both sides in this manner is then discharged from the housing 2. Thus, in the case of the first screen copy, different originals are copied on both sides of the copy paper.

Further, in the case of the second screen copying mode, an original document substantially twice the size of the copy paper supplied from the copy paper supply means 48 is placed on the transparent plate 4. In this case, the original to be copied is placed with the left end of the transparent plate 4 in FIG. 1 as a reference, and covers substantially the entire area of the transparent plate 4 when placed as required. While the copy paper supplied from the copy paper supply means 48 is conveyed through the copy paper conveyance path 58, one of the two halves of the original document is placed on one side of the copy paper.
That is, an image of the left half area in FIG. 1 of the original document is formed. At this time, as is easily understood, the document irradiation lamp 36, the first movable reflector 38, the second movable reflector 40, and the third movable reflector 42 are moved from the position shown by the solid line in FIG. It is scanned and moved substantially to the position shown by the dashed line in FIG. Copy paper with an image formed on one side is
As in the first screen copying mode, the copy sheet is received on the cradle 122 of the copy sheet refeeding means 120 as required. When the copying on one side of the copy paper is completed, the copy paper re-feeding means 120
The copy paper received in the above is re-supplied towards the copy paper transport path 58, and while being re-transported through the copy paper transport path 58, the copy paper with the image formed on one side is coated with the original. An image of the other half of the document, that is, the right half of the original in FIG. 1, is formed. At this time, as is easily understood, the document irradiation lamp 36, the first movable reflector 38, the second movable reflector 40, and the third movable reflector 42 are located at the positions indicated by the dashed lines in FIG. It is scanned and moved from to the position shown by the two-dot chain line in FIG. The copy paper with images formed on both sides in this manner is then discharged from the housing 2. Thus, in the second screen copying mode, one and the other of the two halves of the same document are copied onto both sides of copy paper. For details of this second screen copying mode, for example, see Japanese Patent Publication No. 57-194.
Please refer to Publication No. 27.

Control System of Copying Machine Next, the control system of the electrostatic copying machine described above will be explained with reference to FIG. 1 as well as FIGS. 2 and 3. The illustrated electrostatic copying apparatus includes a control means 142 for controlling the entire apparatus, including copy paper supply means 48, copy paper refeed means 120, etc., as required, as will be described later. Further, electric motors Ml, M2, and M3 are provided as drive sources. The electric motor M1 constituting the main drive source mainly functions to operate the copy paper transport means. The mirror 3 functions to move the second movable reflector 40 and the third movable reflector 42 as described above.The electric motor M3 is disposed in association with the optical system 34, and is used to move the second movable reflector 40 and the third movable reflector 42 as described above. Clutch means CLI, CL2 and Cl3 are provided in connection with the copy paper supply means 48. When the clutch means CLI is energized, the delivery roller 54
a is drivingly connected to an electric motor M1, and copy paper is sent out from a copy paper cassette 52 mounted on the lower cassette receiving portion 50a. When the clutch means CL2 is energized, the delivery roller 54b is driven and connected to the electric motor M1, and copy paper is delivered from the copy paper cassette 52 mounted on the intermediate cassette receiving portion 50b. When the clutch means CL3 is energized, the delivery roller 54b is driven and connected to the electric motor M1, and copy paper is delivered from the copy paper cassette 52 mounted on the upper paper cassette receiver 50c.

Further, clutch means CL4 and Cl3 are provided in association with the copy paper refeeding means 120 and the like. Clutch means CL
4 is energized, the copy paper return means and the copy paper retransmission means 1
20 and the copy paper refeeding means are drivingly connected as required to electric motor M1 for operation. When the clutch means CL5 is energized, the feed conveyance roller 126 is drivingly connected to the drive system of the copy paper return means and the copy paper resupply means, and is rotated in the direction shown by arrow 144. The electrostatic copying apparatus further includes actuating means SL1 such as an electromagnetic solenoid.
．． SL2. It is equipped with SL, 3 and SL4.

The actuating means SLI is arranged in association with the transport control means 94, and when energized, positions the lower movable guide member 98 and the upper movable guide member 100 in the above-mentioned raised position, and when deenergized, the lower movable guide member 98 and the upper movable guide member 100 are positioned in the lowered position.

The actuating means SL2 is disposed in association with the reversing roller 114, and when energized, the actuating means SL3 positions the reversing roller 114 in the operative position, and when deenergized, the activating means SL3 positions the reversing roller 114 in the non-operative position. Feeding conveyance roller 126
When the feeding conveyance roller 12 is disposed in relation to the
6 is positioned in a non-operating position above the pedestal 122, and when the force is removed, the feeding and conveying roller 126 is brought into contact with the pedestal 122 (if there is copy paper on the pedestal 122, the copy paper 1) in the working position (the position shown in Figure 1). The actuating means SL4 is disposed in association with the copy paper movement preventing means 124, and when energized, positions the movement preventing means 124 at the retracted position, and when deenergized, moves the movement preventing means 1.
24 in the blocking position.

The control means 142 controls the above-mentioned elements, ie, the electric motors M1 to M3, based on signals to be described later. Clutch means C
It controls the operation of LI to CL5 and the operating means SLI to SL4, and also controls the operation of the document irradiation lamp 36, the charging corona discharger 22, the transfer corona discharger 26, and the peeling corona discharger 28.

In connection with the control means 142 described above, an operation panel 144 on which various operation keys are provided is attached. This operation panel 144 is disposed, for example, on the upper front surface of the housing 2. Referring primarily to FIG. 3, the key labeled PB is the print key, and when pressed, a copying operation is started. Ten keys on which numbers O to 9 are displayed are the numeric keypad 146, and by arbitrarily selecting and pressing these keys, the number of copies is set, and the set number of copies is displayed on the display section 148. .

In a specific example, it is possible to set up to three digits, that is, 999 sheets.

The keys labeled D, M, and L are exposure adjustment keys 1
50, and by pressing the M key for normal originals, the L key for light-colored originals, and the D key for dark-colored originals, the original can be adjusted during scanning exposure. The appropriate exposure amount will be automatically obtained. Also, reduction l.

The four keys labeled ``Reduction 21'' and ``Enlarge'' are the keys 152 for setting the magnification. By pressing the ``1-size'' key, the 1-size copy is set, and by pressing the ``Reduce 1'' key, the first copy is set. A reduced copy is set, a second reduced copy is set by pressing the Reduce 2 key, and an enlarged copy is set by pressing the Enlarge key. Additionally, the three keys labeled 1-sided 7 2-sided 1 and 2-sided are copy mode setting keys 154. By pressing the 1-sided key, the normal 1-sided copy mode is set, and the 2-sided ■ key is pressed. By this, the first screen copying mode is set, and by pressing the double-sided 2 key, the second screen copying mode is set. Furthermore, the upper row.

The three keys labeled middle and lower are copy paper cassette selection keys 156, and when the upper key is pressed, copy paper is sent out from the copy paper cassette 52 installed in the upper cassette receiver 50C, When the key is pressed, copy paper is sent out from the copy paper cassette 52 installed in the middle cassette receiver 50b, and when the lower key is pressed, the copy paper cassette 52 installed in the lower cassette receiver 50a is fed out.
Copy paper is sent out from the tray 52. An electrostatographic copying apparatus constructed in accordance with the present invention further includes an all clear key 158 labeled "all clear" and a clear stop key 160 labeled clear stop. When the all clear key 158 is pressed, an all clear signal is generated. Further, when the clear stop key 160 is pressed, a clear stop signal is generated. Note that the control style when these signals, that is, the all clear signal and the clear stop signal are generated, will be described later.

All clear signal 1 has been received 11 Next, while referring to the flowchart shown in Figure 4,
The control style when an all-clear signal is generated will be explained.

When the all clear key 158 is pressed for initialization, an all clear signal is generated by the control means 142, and the process moves from step nu-1 to step n1-2. In step n1-2, the all clear signal is transmitted to the control means 14.
In step 2, it is determined whether or not it is possible to accept the request, in other words, it is determined whether or not to perform the operation described below based on the all clear signal. That is, when the device is in a special state or in an abnormal state, the all-clear signal cannot be accepted and the operation described below will not be performed. Furthermore, the all-clear signal cannot be accepted even during a copying operation. In a specific example, when the magnification setting key 152 is operated and the lens assembly 44, the second movable reflecting mirror 40, and the third movable reflecting mirror 42 are moved to the required positions by the action of the electric motor M3, the above-mentioned enters a special state. Further, when copy paper jams (so-called jam) occur in the copy paper transport path 58 or the like, or when failures or the like occur in various elements, an abnormal state occurs. Further, the period from when the print key PB is pressed after setting the number of copies using the numeric keypad 146 until the copying operation for the set number of copies is completed is a copying operation in progress. still,
In the specific example, if the all-clear key 158 is pressed in the above-mentioned abnormal state, special state, or during a copying operation, an all-clear signal is generated, but the control means 142 does not accept it at all, and initialization is performed. In order to do so, the all clear key 158 must be pressed again after the above-mentioned condition is resolved.

If an abnormal state, a special state, or a copying operation is not in progress, an all-clear signal is accepted by the control means 142, and the process proceeds from step n1-2 to step 01-3.

In step n1-3, it is determined whether or not there is copy paper in the copy paper refeeding means 120, and if there is copy paper, the process moves to step n1-5 via steps nl to 4, and the process moves to step n1-5 where copy paper is present. If not, directly step n1-5
Move to. That is, when the copy sheets are received in the holder 122, it is necessary to discharge them out of the housing 2, and therefore, the above-described copy paper discharge operation is performed in step n1-4. If there is copy paper on the cradle 122 (more specifically, if a copy paper was received in the cradle 122 in a previous copying operation and the copy paper is not completely ejected out of the housing 2 and remains on the cradle 122; If there are any copies remaining), the copy paper refeeding means 120 is activated (
That is, the clutch means CL5 is energized as required, and the actuating means SL4 is also energized), and the copy sheets present on the pedestal 122 are fed out one by one by the action of the feeding conveyance roller 126. The thus delivered copy paper is fed to the copy paper transport route 58 via the copy paper resupply route i28, and is discharged to the outside of the housing 2 via the copy paper transport route 58 and the copy paper discharge route 104. During such transport, no copying operation is substantially performed, and therefore no image is formed on the other side of the copy sheet while it is being re-transported through the copy paper transport path 58. In a specific example in which the ejection of the copy paper received in the cradle 122 is completed, when the detection means (not shown) provided in the copy paper ejection path 104 detects the last copy paper, the ejection of the copy paper is completed. After the discharge operation is completed, the process moves to step n1-5.

In step n1-5, initialization of the device is performed. Initialization of the apparatus refers to bringing the copying state to the normal state, and when the electrostatic copying apparatus shown in the figure is initialized, it enters the following state. To explain with reference to FIG. 3, the number of copies is automatically set to 1 in relation to the numeric keypad 146 (therefore, the display on the display section 148 becomes "1"), and the exposure adjustment key 150, the exposure amount is automatically set to the normal original (the same state as when the M key is pressed). In addition, the copy magnification is automatically set to equal magnification in relation to the magnification setting key 152.

Furthermore, the copy mode is automatically set to single-sided copy mode in conjunction with the copy mode setting key 154.

Furthermore, during initialization, key 1 for copy paper cassette selection is also pressed.
The copy paper cassette from which copy paper is delivered in connection with 56 may be automatically set to a copy paper cassette attached to a specific cassette receiver.

As shown above, when the all clear key 158 is pressed before starting a copying operation, the copying status set in the previous copying operation is cleared and the device is initialized, so that the copying status set by the previous operator is cleared. A desired copy state can be easily achieved regardless of the state. Further, at this time, if the copy paper is received by the copy paper retransmission means 120,
Since the copy paper is automatically sent out from the copy paper refeeding means 120 and discharged out of the housing 2, complete initialization of the apparatus is achieved by operating the single all clear key 158.

The clear stop signal is a mass gathering □□□ turbidity 1-
Next, while referring to the flowchart shown in FIG.
The control style when a clear stop signal is generated will be explained.

When the clear/stop key 160 is pressed, the control means 1
A clear stop signal is generated at 42, and step n
The process moves from step 2-1 to step n2-2. Step n2-2
In this step, it is determined whether a clear stop signal can be accepted. In this subroutine (2), in the above-mentioned abnormal state and in the special operating state where the optical system 34 is in the process of changing the magnification, the clear stop signal is sent to the control means 1.
42, and it is necessary to press the clear/stop key 160 again after these conditions are resolved.

On the other hand, in other states (including during the copying operation), the clear stop signal is accepted by the control means 142, and the process proceeds to step n2-3.

In step n2-3, it is determined whether or not a copying operation is in progress. If the copying operation is not in progress, step n2-3 is determined.
4, the number of copies is automatically set to one (therefore, the display on the display section 148 also becomes "1"). Therefore, if the number of copies is erroneously set by operating the numeric keypad 146, the erroneously set number of copies can be cleared as desired by pressing the clear/stop key 160. On the other hand, if the copying operation is in progress, step n2-
The process proceeds to step 5, where it is determined whether the mode is one-sided copying mode.

If it is one-sided copy mode, directly step 02-7
and the second supply state in the first screen copying mode or the second screen copying mode (copy paper refeeding means 120
), step n2-
6 to step n2-7, where the copying operation is completed as desired. Furthermore, in the case of the first supply form B (copy paper is supplied from the copy paper supply means 48) in the first screen copy mode or the second screen copy mode, the process then proceeds to step n2-8; If the mode is the first screen copying mode, the process proceeds to step n2-9 to complete the copying operation, and if it is the second screen copying mode, the process then proceeds to step n240 to terminate the copying operation. It will be terminated once. That is, when the clear stop key 160 is pressed in the single-sided copy mode, the copy paper supply means 48 is deactivated based on the clear stop signal (
Selectively energized clutch means CLI, CL2 or C
L3 is no longer energized), the supply of the next copy sheet is stopped.

Then, when the charging process for the copy paper existing in the copy paper transport path 58 is completed, the charging corona discharger 22 is deenergized, and when the exposure process is completed, the document irradiation lamp 36 is deenergized, and the image forming The means is in a non-imaging state. That is, in the non-image forming state, the image forming means 1 including the rotating drum 8, the charging corona discharger 22, and the document irradiation lamp 36 rotates in the direction indicated by the arrow 10; Since the charging corona discharger 22 and document illumination lamp 36 are deenergized, no image is generated on the photoreceptor of the rotating drum 8. Next, when the transfer process is completed, the transfer corona discharger 26 is deenergized, and when the peeling process is completed, the peeling corona discharger 2 is deenergized, and the original image formed on the surface of the rotating drum 8 is transferred to the copy paper. It is transferred onto one side of a copy sheet that is conveyed through path 58. The copy paper on which the image has been transferred is conveyed further downstream and passes through the copy paper ejection path 1.
04 and is discharged to the outside of the housing 2 and received in the receiving tray 106. When the copy paper is ejected out of the housing 2, and in a specific example, a detection means (not shown) provided at the downstream end of the copy paper ejection path 104 detects the copy paper, the copy paper is fed from the copy paper supply means 48. Then, the copying operation for the copy paper existing in the copy paper transport path 58 is completed, and since the next copying operation is not performed, the copying operation is completed in step 02-7. Also, the first screen copy mode or the second
When the clear stop key 160 is pressed in the second feeding state in the screen copying mode, the copy paper refeeding means 120 is deactivated based on the clear stop signal (i.e., it is not activated when copy paper is sent out). clutch means CL
5 is no longer energized, the actuating means SL5 is deenergized), and the refeeding of the next copy sheet from the copy sheet refeeding means 120 is stopped. Then, when the charging process for the copy paper existing in the copy paper transport path 58 is completed, the charging corona discharger 22 is deenergized, and when the exposure process is completed, the document irradiation lamp 36 is deenergized, and the image forming means is in a non-image forming state. Further, when the transfer process is completed, the transfer corona discharger 26 is deenergized, and when the peeling process is completed, the peeling corona discharger 28 is deenergized, so that the original image formed on the surface of the rotating drum 8 has already been transferred to the copy paper again. The image is transferred onto copy paper being sent out from the means 120. The copy paper on which the image has been transferred is further conveyed downstream and is discharged out of the housing 2 through a copy paper discharge path 104. Copy paper is in housing 2
In a specific example, when the detection means (not shown) of the copy paper ejection path 104 detects a copy paper, the copy paper is sent out from the copy paper refeeding means 120 and the copy paper existing in the copy paper conveyance path 58 is ejected to the outside. The copying operation is completed and the next copying operation is not performed, so the copying operation is similarly terminated at step n2-7. Furthermore, if the clear stop key 160 is pressed during the first supply state in the first screen copy mode (or second screen copy mode),
Based on the clear stop signal, the copy supply means 48 is deactivated and the supply of the next copy sheet is stopped.

When the copying process is performed as required on the copy sheet fed from the copy m supply means 48 and present in the copy paper conveyance path 58, the image forming means is brought into the non-image forming state as described above. The transfer corona discharger 26 and the peeling corona discharger 28 are also deenergized as required.

The copy paper on which the image has been formed is further conveyed as described above, passes through the copy paper return path 110, and is transferred to the copy paper refeeding means 120.
is received on the pedestal 122 of. Is the copy paper placed on the pedestal 122?
When the detecting means (not shown) provided in the detecting means (not shown) detects the copy paper, the above-mentioned copying operation for the copy paper supplied from the copy paper supply means 48 and existing in the copy paper conveyance path 58 is completed; Step n because the next copying operation is not performed
The copying operation ends at 2-9 (or n2-10). In this specification, the end point of the copying operation for each copy paper means the time when the copy paper conveyed through the copy paper conveyance path 58 is ejected out of the housing 2 through the copy paper ejection path 104, or until the above-mentioned copy paper is This refers to the period until the copy paper is received by the cradle 122 of the copy paper refeeding means 120 (therefore, the detection means (not shown) provided at the downstream end of the copy paper ejection path 104 detects the copy paper, or the copy paper provided in the copy paper refeeding means 120 detects the copy paper. until the detection means (not shown) detected by the copy paper.

When the copying operation is completed in step n2-7 (the copying operation is completed at the second supply letter l, f in the single-sided copying mode, the first screen copying mode, or the second screen copying mode), step n2 -11, it is determined whether or not there is any copy paper in the copy paper retransmission means 120.

If there is no copy paper in the copy paper resending means 120,
Returning to step 2-4, the number of copies is automatically set to one. On the other hand, if there is copy paper in the copy paper refeeding means 120, the process moves to step n2-12, and the number of copies is automatically set to the number of copies accepted by the copy paper refeeding means 120 (display The number of copies accepted by the copy paper retransmission means 120 is displayed in the section 148). Next, the process proceeds to step n2-13, where a one-sided copy mode is started in which an ejection instruction lamp (not shown) is lit;
Alternatively, when the clear/stop key 160 is pressed in the second supply state in the first screen copying mode or the second screen copying mode, it is assumed that no further copying is required, and therefore the specific In the example, an ejection instruction lamp is lit. Note that it is only necessary to press the key PB or the all clear key 158. When the print key PB is pressed, the copy paper received by the copy paper refeeding means 120 is transferred to the copy paper conveyance path 5.
After being copied while being conveyed through 8, it is discharged to the outside of the housing 2. Furthermore, when the all clear key 158 is pressed, as can be easily understood from the above description,
The above-mentioned copy paper passes through the copy paper conveyance path 58 and is discharged outside the housing 2 without being copied.

When the copying operation is completed in step n2-9 (the copying operation is completed in the first supply state in the first screen copying mode), the process proceeds to step n2-14, where the number of copies is accepted by the copy paper re-feeding means 120. (Therefore, the display unit 148 displays the number of copies accepted by the copy paper retransmission means 120).

Next, the process proceeds to step n2-15, and the other side copy instruction lamp (not shown) is turned on. In the first supply state in the first screen copying mode, since the operator specifies the first screen copying mode at the start of the copying operation, normal copying on both sides of the copy paper is intended; In the specific example, when the clear/stop key 160 is pressed, the other side copy instruction lamp (
(not shown) is lit. Even in such a case, if you wish to eject the copy paper to the outside of the housing 2 after copying it to the other side, you only need to press the print key PB, and you can copy the copy paper to the other side. If you wish to discharge the liquid to the outside of the housing 2, you can press the all clear key 158. In the specific example, the ejection instruction lamp and the other side copy instruction lamp are provided, but only the ejection instruction lamp is provided and step n2-
Step n2- is also performed when the copying operation is completed in 9.
Similarly to 13, the discharge instruction lamp may be turned on.

The copying operation ends in step n2-10 (second
(the copying operation is once completed in the first supply state in the screen copying mode), and then sequentially step n2-1
6 to n2-18, the copy paper is automatically copied onto the other side, and then ejected from the housing 2. In the first supply state where the second screen copying mode is set, the operator specifies the second screen copying mode at the start of the copying operation, so that so-called continuous copying on both sides of the copy paper (copy paper For one side, copy one of the two parts of the original to be copied, and for the other side of the copy paper, copy two parts of the original.
(to make a copy of the other divided part).

Therefore, if the copying operation is ended when the clear/stop key 160 is pressed and, for example, the other side copying instruction lamp is turned on, it will be contrary to the operator's intention, and even if the copying operation does not match the operator's intention, If you want to do this, you will have to operate a print key, for example, which will make the operation complicated. Therefore, in the electrostatic copying apparatus according to the present invention, after the copying of one of the two halves of the original is completed, the copy of the other halves of the original is transferred to the copy paper received by the copy paper refeeding means 120. It is configured so that it can be executed continuously without any operation, and by configuring it in this manner, it is made to better match the operator's intention. That is, step n
Once the copying operation is completed in step n2-10, the process then proceeds to step n2-16, where the number of copies is determined by the copy paper refeeding means 1.
20 (therefore, the display section 148 shows the number of copies accepted by the copy paper refeeding means 120).
(Displays the number of copies accepted). Then, in step n-17, the copy paper refeeding means 120
is activated, the above-described copying operation is performed as required on the copy paper fed from the copy paper refeeding means 120, and every time each copying operation is completed (in the specific example, the copy paper ejection path 10
Each time the detection means (not shown) provided at step n2-16 detects a copy sheet), the number of copies detected is subtracted from "1" (therefore, the display section 148 displays
(This will display the number of copy sheets present in the housing 2).

When the copying on the other side of the copy paper is completed, the copy paper refeeding means 120 becomes inactive, the image forming means enters a non-image forming state, and the transfer corona discharger 26 and the like are also deenergized. , the copying operation for the other side of the copy paper is completed.

[Brief explanation of drawings]

FIG. 1 is a simplified sectional view showing a specific example of an electrostatic copying apparatus constructed in accordance with the present invention. FIG. 2 is a diagram showing a simplified control system of the electrostatic copying apparatus shown in FIG. 1. FIG. 3 is a plan view showing the operation panel of the first electrostatic copying apparatus. FIG. 4 is a flowchart showing a part of the control method of the electrostatic copying apparatus of FIG. FIG. 5 is a flowchart showing another part of the control method of the electrostatic copying apparatus of FIG. 2... Housing 8... Rotating drum 34... Optical system 48... Copy paper supply means 58... Copy paper conveyance path 110... Copy paper return path 120... Copy paper refeeding means 128 ... Copy paper re-supply path 142 ... Control means 144 ... Operation panel 158 ... All clear key 160 ... Clear stop key Patent applicant: Sanda Kogyo Co., Ltd. Figure 2

Claims (1)

[Scope of Claims] 1. An image forming means, a copy paper conveyance path, and a copy paper supply means for supplying sheet-like copy paper to the copy paper conveyance path;
a copy paper return route, a copy paper re-supply route, and a system for receiving copy paper returned through the copy paper return route and resupplying the accepted copy paper to the copy paper transport route through the copy paper re-supply route; copy paper refeeding means, wherein the copy paper supplied from the copy paper supply means to the copy paper conveyance path is conveyed through the copy paper conveyance path by the action of the image forming means. The copy paper with an image formed on one side, and the copy paper with the image formed on one side, is selectively introduced into the copy paper return path and returned to the copy paper retransmission means through the copy paper return path, and then the copy paper is The copy paper is resupplied from the paper refeeding means through the copy paper resupply path to the copy paper conveyance path, and an image is formed on the other side of the copy paper by the action of the image forming means while being conveyed again through the copy paper conveyance path. an electrostatographic copying apparatus of the type that is used; comprising a control means for controlling the apparatus; the control means is configured to perform an all-clear signal based on the all-clear signal when the all-clear signal is generated and received by the control means; When the apparatus is initialized and a copy paper is received by the copy paper refeeding means, the copy paper refeeding means is activated, so that the copy paper received by the copy paper refeeding means is An electrostatic copying apparatus characterized in that the copy paper is discharged out of the housing through a copy paper resupply path and the copy paper transport path. 2. When the all-clear signal is accepted by the control means, the control means initializes the apparatus based on the all-clear signal if there is no copy paper in the copy paper retransmission means; When copy paper is received by the copy paper refeeding means, the copy paper refeeding means is activated based on the all clear signal, thereby causing the copy paper received by the copy paper refeeding means to be activated. The electrostatic copying device according to claim 1, wherein the copy paper is discharged from the housing through the copy paper re-supply path and the copy paper conveyance path without forming an image on other surfaces, and the apparatus is then initialized. Device. 3. If the all-clear signal is generated in an abnormal state or special state of the apparatus or during a copying operation, the control means does not accept the all-clear signal, as claimed in claim 1 or 2. The electrostatographic apparatus described. 4. an image forming means, a copy paper conveyance path, and a copy paper supply means for supplying a sheet of copy paper to the copy paper conveyance path;
a copy paper return route, a copy paper re-supply route, and a system for receiving copy paper returned through the copy paper return route and resupplying the accepted copy paper to the copy paper transport route through the copy paper re-supply route; copy paper refeeding means, wherein the copy paper supplied from the copy paper supply means to the copy paper conveyance path is conveyed through the copy paper conveyance path by the action of the image forming means. The copy paper with an image formed on one side, and the copy paper with the image formed on one side, is selectively introduced into the copy paper return path and returned to the copy paper retransmission means through the copy paper return path, and then the copy paper is The copy paper is resupplied from the paper refeeding means through the copy paper resupply path to the copy paper conveyance path, and an image is formed on the other side of the copy paper by the action of the image forming means while being conveyed again through the copy paper conveyance path. Furthermore, in the first double-sided copying mode, a desired original is copied onto one side of the copy paper while being conveyed from the copy paper supply means through the copy paper transport path, and is copied again from the copy paper refeeding means. While the copy paper is conveyed through the copy paper conveyance path, another original document different from the desired original document is copied on the other side of the copy paper,
On the other hand, in the second double-sided copy mode, one of the two halves of the desired document is copied onto one side of the copy paper while being conveyed from the copy paper supply means through the copy paper conveyance path;
In an electrostatic copying apparatus of the type in which the other half of the desired document is copied onto the other side of the copy paper while being conveyed from the copy paper refeeding means through the copy paper conveying path again; a first means for supplying copy paper from the copy paper supply means to the copy paper conveying path in the second double-sided copying mode; When a clear stop signal is generated and accepted by the control means when the paper is being supplied, the control means temporarily ends the copying operation based on the clear stop signal and transfers the copy to the copy paper retransmission means. If paper has been received, then the copy paper refeeding means is activated and the image forming means is brought into an image forming state, whereby the copy paper received by the copy paper refeeding means is transferred to the copy paper refeeding means. The copy paper transport path is resupplied through the paper resupply path, and while being transported through the copy paper transport path, the other of the two halves of the desired original is formed on the other side of the copy paper by the action of the image forming means. An electrostatic copying apparatus characterized in that copy paper that has been copied and then re-supplied is discharged from the housing. 5. When the clear stop signal is received by the control means in the first supply state in the second double-sided copying mode and during copying operation, the control means starts copying based on the clear stop signal. The electrostatic copying apparatus according to claim 4, wherein the copying operation is temporarily terminated after the operation is completed. 6. When the clear stop signal is generated and accepted by the control means during the first supply state in the second double-sided copying mode, the control means performs the clear stop signal based on the clear stop signal. 6. An electrostatic copying apparatus according to claim 4, wherein the copy paper feeding means is brought into a non-operating state and the image forming means is brought into a non-image forming state, thereby temporarily terminating the copying operation. 7. In the second supply state in which copy paper is supplied from the copy paper refeeding means to the copy paper transport path in the first double-sided copy mode or the second screen copy mode, the clear
The apparatus according to any one of claims 4 to 6, wherein when a stop signal is generated and accepted by the control means, the control means terminates the copying operation based on the clear stop signal. Electrostatographic equipment. 8. When the clear stop signal is received by the control means during the copying operation in the first double-sided copying mode or in the second supply state and copying operation in the second double-sided copying mode, 8. The electrostatic copying apparatus according to claim 7, wherein the control means terminates the copying operation after the copying operation is completed based on the clear stop signal. 9. When the clear stop signal is received by the control means in the first supply state in the first double-sided copying mode, the control means controls the copy paper supply based on the clear stop signal. the means for inactivation and the imaging means for non-imaging, thus terminating the copying operation, and the second supply state in the first duplex mode or the second duplex mode. When the corresponding clear
When the stop signal is received by the control means, the control means deactivates the copy sheet refeeding means and puts the image forming means into the non-image forming state based on the clear stop signal, thus preventing copying. An electrostatographic copying apparatus according to claim 7 or claim 8, wherein the operation is completed. 10. In abnormal and special conditions of the device, the clearing and
If a stop signal is generated, the control means does not accept the clear stop signal.
The electrostatic copying apparatus according to any one of items 1 to 9.