JP2520088B2 - Electrostatic copier - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic copying machine, and more particularly to an electrostatic copying machine capable of forming an image on both sides of a copying paper as required.

[0002]

2. Description of the Related Art It is often desirable to form images on both sides of a copy sheet from the standpoint of saving copy sheets and reducing the number of documents to be stored. An electrostatic copying machine capable of forming an image on both sides of a copy paper has been proposed and put into practical use. A typical example of such an electrostatic copying machine is a copy paper feeding path, copy paper feeding means for feeding a sheet copy paper to the copy paper feeding path, and a copying paper feeding path adjacent to the downstream end of the copying paper feeding path. A transfer control means, a copy paper discharge path extending from an upstream end adjacent to a downstream end of the transfer control means, and a copy paper reverse rotation path extending from an upstream end adjacent to a downstream end of the transfer control means. The copy paper return path extending from the upstream end adjacent to the upstream end of the transfer control means, the copy paper resupply path, and the copy paper returned through the copy paper return path is transferred through the copy paper resupply path to the copy paper transfer path. And a copy sheet retransmitting means for resupplying to the path.
The transport control means includes a lower movable guide member and an upper movable guide member that define a copy paper movement path therebetween. The lower movable guide member and the upper movable guide member are in a raised position for connecting the downstream end of the copy paper transport path and the upstream end of the copy paper discharge path, and the downstream end of the copy paper transport path and the copy paper. It is selectively positioned in the lowered position for communicating with the upstream end of the reverse rotation path.

The supporting frame structure of the electrostatic copying machine is a so-called shell structure, that is, an upper supporting frame mounted on the lower supporting frame so as to be rotatable between a lower supporting frame and an operating position and a non-operating position. Conveniently, the structure comprises a body. In this case, at least most of the copy paper transport path and the copy paper discharge path are between the lower support frame and the upper support frame when the upper support frame is located in the working position. It is defined and is opened when the upper support frame is brought to the non-acting position. The above copy paper reverse path is
It is provided in the upper support frame. At least most of the copy paper return path, the copy paper retransmitting means, and at least most of the copy paper supply path are provided in the lower support frame.

In the electrostatic copying machine as described above, an image is formed on one side of the copy paper while the copy paper supplied from the copy paper supply means to the copy paper carrying path is carried through the copy paper carrying path. To be done. When it is desired to form an image on only one side of the copy sheet, the copy sheet having the image formed on one side has a lower movable guide member and an upper movable guide member which are positioned at the lowered position. It is introduced into the copy paper discharge path through the copy paper moving path between and then discharged through the copy paper discharge path. On the other hand, when it is desired to form an image on both sides of the copy paper, the copying machine having an image formed on one side has a lower movable guide member and an upper movable guide member which are positioned at the raised position. It is introduced into the copy paper reversing path through the copy paper moving path between. Then, after the trailing edge of the copy paper passes 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 path, and the copy paper is returned to the copy paper retransmitting means through the copy paper return path. Will be returned. Thereafter, the copy paper is re-supplied from the copy paper retransmitting means to the copy paper conveying path through the copy paper resupply path. Then, an image is formed on the other surface of the copy paper while the copy paper is re-conveyed through the copy paper conveyance path. Thereafter, the copy paper on which images are formed on both sides is introduced into the copy paper discharge path through the copy paper moving path between the lower movable guide member and the upper movable guide member positioned at the lowered position, and then copied. It is discharged through the paper discharge path.

[0005]

The electrostatic copying machine as described above has the following problems to be solved.
That is, from the standpoint of removing the copy paper which is at least partially present in the copy paper movement path defined between the lower movable guide member and the upper movable guide member which constitutes the transport control means and which has been stopped. For example, the lower movable guide member is mounted on the lower support frame body, and the upper movable guide member is mounted on the upper support frame body. It is hoped that they will be opened. On the other hand, the lower movable guide member and the upper movable guide member are required to be selectively positioned in the lowered position and the raised position, and the above-mentioned positioning of both the lower movable guide member and the upper movable guide member is performed simply. In order to be able to carry out with one actuating means (for example an electromagnetic solenoid), it is intended, for example, to interconnect the lower movable guide member and the upper movable guide member at the front end and / or the rear end. . However, in this case, as will be easily understood, it is necessary to mount both the lower movable guide member and the upper movable guide member on the lower support frame body or the upper support frame body, which satisfies the above-mentioned demand. Can not do it.

The present invention has been made in view of the above facts, and its main technical problem is that the lower movable guide member and the upper movable guide member constituting the transport control means are respectively provided with a lower support frame. It is attached to the upper support frame, and therefore, when the upper support frame is moved to the inoperative position, the copy paper moving path between the lower movable guide member and the upper movable guide member is opened. First, the positioning of both the lower movable guide member and the upper movable guide member is performed by a single actuating means, thus providing an electrostatic copying machine which can solve the above problems.

[0007]

According to the present invention, as an electrostatic copying machine that achieves the above-mentioned main technical problems, the lower support frame and the lower support frame are rotatably movable between a working position and a non-working position. An upper support frame mounted on the support frame, a copy paper conveyance path, copy paper supply means for supplying a sheet copy paper to the copy paper conveyance path, and adjacent to a downstream end of the copy paper conveyance path Transport control means, a copy paper discharge path extending from the upstream end adjacent to the downstream end of the transfer control means, and a copy paper reverse rotation path extending from the upstream end adjacent to the downstream end of the transfer control means. A copy paper return path extending from an upstream end adjacent to the upstream end of the transfer control means, at least a majority of the copy paper transfer path being located when the upper support frame is in the working position. A rule is set between the lower support frame and the upper support frame. Have been, the upper support frame body is opened and allowed to the non-operative position, the copying paper reversing path is
The copy paper return path is provided inside the upper support frame, and the transfer control means is a lower movable guide member that defines a copy paper movement path therebetween. And an upper movable guide member, and the lower movable guide member and the upper movable guide member make the copy paper conveyance path and the upstream end of the copy paper discharge path communicate with each other, and the copy paper. The copy paper, which is selectively positioned at the descending position for connecting the downstream end of the transport path and the upstream end of the copy paper reverse rotation path, and is supplied from the copy paper supply means to the copy paper transport path is An image is formed on one side of the copy sheet while being conveyed through the copy sheet conveying path, and the copy sheet having the image formed on the one side is the lower movable guide member positioned at the lowered position and the lower movable guide member. Copy paper moving diameter between upper movable guide member Through the copy paper discharge path and then discharged through the copy paper discharge path, or an image is formed on one side of the copy paper, the lower movable guide member positioned at the raised position and the upper side. It is introduced into the copy paper reversing path through the copy paper moving path between the movable guide member and the copy paper reversing path, and then the moving direction of the copy paper is reversed after the trailing end of the copy paper passes the downstream end of the copy paper conveying path.
An image is formed on the other surface of the copy paper while being introduced into the copy paper return path, returned through the copy paper return path, re-supplied to the copy paper conveyance path, and re-conveyed through the copy paper conveyance path. After that, it is introduced into the copy paper discharge path through the copy paper moving path between the lower movable guide member and the upper movable guide member which are positioned in the lowered position, and then discharged through the copy paper discharge path. Type electrostatic copier; the lower movable guide member is mounted on the lower support frame body, the upper movable guide member is mounted on the upper support frame body, and the upper support frame body is inoperative. When set to the position, the copy paper movement path between the lower movable guide member and the upper movable guide member is opened, and one of the upper movable guide member and the lower movable guide member is opened. Either the lowered position or the raised position One of the upper movable guide member and the lower movable guide member is provided with an operating means for selectively positioning the upper movable guide member and the lower movable guide member in the lowered position and the raised position. A contact means is formed on the other of the upper movable guide member and the lower movable guide member, and a contacted means is formed on one of the upper movable guide member and the lower movable guide member. When the other of the upper movable guide member and the lower movable guide member is moved from the one of the lowered position and the raised position to the other, the corresponding contact means acts on the contacted means. There is provided an electrostatic copying machine characterized in that one of the upper movable guide member and the lower movable guide member is forcibly moved to the other of the lowered position and the raised position.

[0008]

When the actuating means (electromagnetic solenoid) is deenergized, the upper movable guide member, which is positioned at the lower movable guide member descending position and is elastically biased by the tension spring, is the contacted means. Is brought into contact with the lower movable guide member contacting means, and is positioned at the lowered position. On the other hand, when the actuating means (electromagnetic solenoid) is energized, the lower movable guide member is positioned in the raised position, and the abutting means in the lower movable guide member and the contact in the upper movable guide member cooperating therewith. The contact means also positions the upper movable guide member in the raised position against the elastic biasing action of the tension spring. Further, when the upper support frame is moved from the operating position to the non-operating position, the upper movable guide member is separated upward from the lower movable guide member, and the copy paper movement path defined between them is opened. To be done.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of an electrostatic copying machine constructed according to the present invention will be described in detail below with reference to the accompanying drawings.

General Outline of Electrostatic Copier FIG. 1 schematically shows main components in an embodiment of the electrostatic copier constructed according to the present invention. First
The electrostatic copying machine shown in the figure includes a housing 2 having a substantially rectangular shape. On the upper surface of the housing 2, a stationary transparent plate 4 on which a document (not shown) to be copied is placed, and an openable and closable document for covering the transparent plate 4 and the document placed on the transparent plate 4. A pressing member 6 is provided.
A rotary drum 8 having an electrostatic photosensitive member on its peripheral surface is rotatably mounted in a substantially central portion of the housing 2. A charging area 12, an exposure area 14, a developing area 16, a transfer area 18, and a cleaning area 20 are defined in order around the rotary drum 8 which is rotationally driven in the direction indicated by the arrow 10, when viewed in the direction indicated by the arrow 10. Has been done. The charging area 12 is provided with a charging corona discharger 22, the developing area 16 is provided with a developing device 24, and the transfer area 18 is provided with a transfer corona discharger 26 and a peeling corona discharger 28. Then, the cleaning area 20 is provided with a charge eliminating lamp 30 and a residual toner removing blade 32.

Above the rotary drum 8, the reference numeral 34
The optical system indicated by is provided. The optical system 34 includes a movable original illumination lamp 36, a first movable reflecting mirror 38, a second movable reflecting mirror 40, a third movable reflecting mirror 42, a stationary lens assembly 44 and a stationary reflecting mirror 46. . During the scanning exposure, the movable original illumination lamp 36 and the first movable reflecting mirror 38 are moved substantially horizontally from the scanning exposure start position shown by the solid line to a required position (for example, the maximum scanning exposure end position shown by the two-dot chain line). The second movable reflecting mirror 40 and the third movable reflecting mirror 42 are moved at the required speed V, and the second movable reflecting mirror 40 and the third movable reflecting mirror 42 are moved substantially horizontally from the scanning exposure start position indicated by the solid line to the required position (for example, the maximum scanning exposure end indicated by the chain double-dashed line). To a position) at a speed V / 2 which is 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 reflected light from the document is reflected by the first, second and third movable reflecting mirrors 38, 40 and 42. The light is sequentially reflected to reach the lens assembly 44, and then is reflected by the stationary reflecting mirror 46 to be projected on the photoconductor in the exposure area 14. When the scanning exposure is completed, the movable original illumination lamp 36 and the first, second and third reflecting mirrors 38, 40 and 42.
Is returned to the scanning exposure start position indicated by the solid line.

At one end portion of the housing 2, that is, at the right end portion in FIG. The illustrated copy paper feeding means 48 includes a lower cassette receiving portion 50a, an intermediate cassette receiving portion 50b, and an upper cassette receiving portion 50c. Lower cassette receiving part 5
0a, the intermediate cassette receiving portion 50b, and the upper cassette receiving portion 50c are each selectively detachably mounted with one of several types of copy paper cassettes 52 accommodating sheet copy papers of different sizes. It Lower cassette receiving part 50
a, middle cassette receiving portion 50b and upper cassette receiving portion 5
0c has a copy paper cassette 52 mounted therein.
Feeding roller 54a for feeding the copy paper one by one from the
54b and 54c are provided. The copy paper sent from the copy paper cassette 52 mounted on the lower cassette receiving portion 50a is numbered 5 as a whole through the copy paper feeding path 56a.
It is introduced into the copy paper conveyance path indicated by 8. The copy paper delivered from the copy paper cassette 52 mounted on the intermediate cassette receiving portion 50b is introduced into the copy paper transport path 58 through the copy paper feed paths 56b and 56a. The copy paper delivered from the copy paper cassette 52 mounted in the upper cassette receiving portion 50c is introduced into the copy paper transport path 58 through the copy paper feed paths 56c, 56b and 56a. The copy paper feed path 56a is defined by the upstream portion of the guide plate 60 and a part of the guide plate 62, and the copy paper feed path 56b is defined by the guide plate pair 64, and the copy paper feed path 56c.
Is defined by the guide plate pair 66. A pair of feeding rollers 68 are disposed between the upstream end of the copy paper feed path 56a and the downstream end of the copy paper feed path 56b, and the feed roller pair 68 is provided between the upstream end of the copy paper feed path 56b and the copy paper feed path. A feed roller pair 69 is arranged between the downstream end of the path 56c and the downstream end.

The copy paper transport path 58 extends substantially horizontally from right to left in FIG. 1 from an upstream end 70 to a downstream end 72. The copy sheet conveying path 58 is formed by the guide plate 6 described above.
0 downstream portion and the guide plate 74 downstream portion, the transport roller pair 7
6, a guide plate pair 78, a conveyance roller pair 80, a guide plate 82, the transfer area 18 (that is, the rotary drum 8 and the transfer corona discharge 2
6 and the corona discharge 28 for peeling), the conveyor belt mechanism 84, the guide plate 86, the heat fixing roller pair 88, the guide plate pair 9
0 and the conveying roller pair 92. A conveyance control unit 94 is arranged adjacent to the downstream end 72 of the copy sheet conveyance path 58. This transport control means 94 is
It includes a lower movable guide member 98 and an upper movable guide member 100 that define a copy paper movement path 96 between them. The lower movable guide member 98 and the upper movable guide member 100 are selectively positioned at the lowered position shown by the solid line and the raised position shown by the chain double-dashed line. The transport control means 94 will be described in detail later. A copy paper discharge path 104 having a pair of discharge rollers 102 is provided on the downstream side of the conveyance control unit 94. The tray 106 is detachably attached to the other end of the housing 2, that is, the left end in FIG.

Further, in association with the transport control means 94, there are provided a copy paper reversing path generally designated by numeral 108 and a copy paper returning path generally designated by numeral 110.
The copy paper reverse rotation path 108 defined by the pair of guide plates 112 extends from the upstream end adjacent to the downstream end of the transfer / conveyance control means 94 to an appropriate curved shape. At the upstream end of the copy paper reversing path 108, a reversing roller 114 that is selectively positioned between the non-acting position shown by the solid line and the working position shown by the two-dot chain line is arranged. The copy sheet return path 110 is located from the upstream end adjacent to the upstream end of the conveyance control means 94 to the first end.
In the figure, it extends from left to right with a slight incline.
The copy sheet return path 110 is defined by a guide plate pair 116 arranged at the upstream end thereof and a return control mechanism indicated by reference numeral 118 as a whole on the downstream side of the guide plate pair 116. There is. The return control mechanism 118 is a patent application No. 251565 of 1984 (application name: electrostatic copying machine, filing date: November 30, 1984) filed by the applicant.
The configuration may be as disclosed in the specification and drawings of Japanese. As will be easily understood by referring to FIG. 1, when the lower movable guide member 98 and the upper movable guide member 100 of the conveyance control unit 94 are positioned at the lowered position shown by the solid line, the copy paper conveyance path 58. The copy paper discharge path 104 and the copy paper discharge path 104 are communicated with each other via the copy paper movement path 96 in the conveyance 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 ascending position indicated by the chain double-dashed line, the copy paper conveyance path 58 and the copy paper reverse rotation path 108 become the copy paper movement path in the conveyance control means 94. The copy paper reversing path 108 and the copy paper returning path 110 are connected to each other via the copy paper moving path 96 in the conveyance control means 94.

In the electrostatic copying machine shown in the figure, a copy paper retransmitting means generally designated by 120 is provided below the copy paper returning path 110. This copy paper retransmitting means 1
20 has a pedestal 122 that extends substantially horizontally. Stop means 124 is arranged at the front end of the cradle 122, that is, at the right end in FIG. The stopping means 124 is selectively positioned at either the operating position shown by the solid line or the non-operating position shown by the chain double-dashed line. A feeding roller 126 is provided on the front end of the cradle 122. The feeding roller 126 is mounted so as to be able to freely move upward from the position shown in contact with the upper surface of the pedestal 122, and is normally biased by its own weight (appropriate spring means if necessary). Forced downward by action. Further, the whole number 128 extends from the front end of the copy paper retransmitting means 120 to the upstream end 70 of the copy paper transport path 58.
A copy paper re-feeding path indicated by is provided. The paper feeding path 128 for copying paper is provided with a guide plate 130 and a re-feed roller 13.
2, the re-feed roller pair 134, the guide plate pair 136, and the upstream portion of the guide plate 74.

The outline of the operation of the illustrated electrostatic copying machine as described above is as follows. The rotary drum 8 is rotated in the direction shown by the arrow 10, and in the charging area 12, the surface of the photoconductor on the rotary drum 8 is charged to a characteristic polarity by the charging corona discharger 26, and in the exposure area 14,
The image of the original document placed on the transparent plate 4 is scanned and exposed on the photoconductor by the optical system 34, thus forming an electrostatic latent image on the photoconductor. In the developing area 16, the developing device 24 applies toner to the electrostatic latent image on the photoconductor to develop the electrostatic latent image into a toner image. In the transfer area 18, copy paper conveyed through the transfer area 18 (the transfer of copy paper will be further referred to later) is brought into contact with the surface of the photoconductor, and the transfer corona discharger 26 acts on the photoconductor. The toner image is transferred onto the copy paper. Next, the copy paper is peeled from the photoconductor by the action of the peeling corona discharger 28. The peeled copy paper is conveyed to the heat fixing roller pair 88, and the toner image is fixed on the copy paper when passing through the roller pair 88. On the other hand, in the cleaning area 20, the light from the charge eliminating lamp 30 is applied to the photoconductor to erase the residual charge on the photoconductor, and then the residual toner blade 3 is discharged.
By the action of 2, the residual toner is removed from the surface of the photoconductor.

The conveyance of copy paper will be described below. First, the case where an image is formed on only one side of copy paper will be described. In this case, the transport control means 9
4 lower movable guide member 98 and upper movable guide member 100
Are positioned in the lowered position indicated by the solid line. The copy paper introduced from the copy paper cassette 52 mounted on the lower cassette receiving portion 50a, the intermediate cassette receiving portion 50b, or the upper cassette receiving portion 50c to the copy paper transporting path 58 is transported through the copy paper transporting path 58. During this time, the toner image is transferred to one side (that is, the upper surface) of the copy paper in the transfer area 18, and the toner image is fixed on the one side of the copy paper by the action of the heat fixing roller pair 88, and thus the one side of the copy paper. An image is formed on. Next, the copy sheet is introduced from the copy sheet conveying path 58 to the copy sheet discharging path 104 through the copy sheet moving path 96 in the conveying control means 94, and is discharged to the tray 106 through the copy sheet discharging path 104.
Thus, a copy having an image formed on one side thereof is obtained.

When images are formed on both sides of copy paper,
First, the lower movable guide member 98 and the upper movable guide member 100 of the conveyance control means 94 are positioned at the raised position shown by the chain double-dashed line. Next, when the copying process is started, the copy paper cassette 52 mounted on the lower cassette receiving portion 50a, the intermediate cassette receiving portion 50b or the upper cassette receiving portion 50c.
The copy paper introduced from the copy paper conveyance path 58 is conveyed through the copy paper conveyance path 58. During this period, the toner image is transferred to one surface (that is, the upper surface) of the copy paper in the transfer area 18, and the toner image is heated and fixed by the roller pair 88.
Is fixed on one side of the copy paper, and thus an image is formed on one side of the copy paper. The copy sheet from the copy sheet conveying path 58 is introduced into the copy sheet reversing path 108 through the copy sheet moving path 96 in the conveyance control means 94, and advances in the copy sheet reversing path 108 in the direction indicated by an arrow 138. At this time, the lower surface of the copy paper 102 is one of the pair of discharge rollers 102 that is being driven to rotate in the direction indicated by arrow 140.
a, but a slip is created between the discharge roller 102a and the copy paper, and therefore the copy paper is not
Although a is rotationally driven in the direction indicated by arrow 140, it can proceed in the direction indicated by arrow 138. When the trailing end of the copy paper passes the downstream end of the copy paper transport path 58, that is, the nip portion of the transport roller pair 92, the reverse roller 11 provided at the upstream end of the copy paper reverse rotation path 108.
4 is positioned at the operating position indicated by the chain double-dashed line, whereby the copy paper is pressed against the one 102a of the discharge roller pair 102. As a result, the copy sheet is moved in the direction shown by the arrow 142 with its front and back reversed by the action of the discharge roller 102a which is being rotationally driven in the direction shown by the arrow 140. Then, one side 92a of the conveying roller pair 92, which is being rotationally driven in the direction indicated by the arrow 140.
And the guide plate pair 116 and one of the pair of guide plates 116a are introduced into the copy paper return path 110 and proceed through the copy paper return path 110. The reverse rotation roller 114 in the copy paper reverse rotation path 108 is returned to the non-acting 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 sheet advanced through the copy sheet return path 110 is guided to the receiving table 122 of the copy sheet retransmitting means 120, and moves on the receiving table 122 to the right in FIG.
Then, the feeding roller 126, which is rotated in the direction indicated by the arrow 144, acts on the copy sheet to further feed the copy sheet to the right, and thus the leading edge of the copy sheet is positioned at the operating position indicated by the solid line. It is brought into abutment with the stopping means 124. As a result, the progress of the copy sheet is blocked and the copy sheet is stopped at the required position on the copy sheet retransmitting means 120.
Even if the feeding roller 126 is rotated in the direction indicated by the arrow 144 at this time point, a slip is generated between the feeding roller 126 and the copy sheet, and the copy sheet is not further advanced.

When the required number of copy sheets are returned to the copy sheet retransmitting 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. Be done. Then, the stop means 124 of the copy paper retransmitting means 120 is positioned at the non-acting position indicated by the chain double-dashed line, and by the action of the feeding roller 126 which is rotationally driven in the direction indicated by the arrow 144, the copy paper retransmitting means 120 is operated. Are sent to the copy paper resupply path 128. The copy paper sent to the copy paper resupply path 128 is
The sheets are advanced one by one through the copy paper re-supplying path 128 and are again supplied to the copy paper conveying path 58. As easily understood by referring to FIG. 1, such a copy sheet is turned upside down by passing through a substantially semicircular copy sheet re-supply path 128, and one side on which an image has already been formed is made a bottom side. In this state, it is supplied to the copy paper conveyance path 58. Next, the copy paper is conveyed through the copy paper conveyance path 58. At this time, in the transfer area 18, the toner image is transferred to the other surface of the copy paper, that is, the upper surface, and the toner image is fixed on the copy paper by the action of the heating and fixing roller pair 88, and thus the image is transferred to the other surface of the copy paper. It is formed. Next, the copy sheet is introduced from the copy sheet conveying path 58 to the copy sheet discharging path 104 through the copy sheet moving path 96 in the conveying control means 94, and is discharged to the tray 106 through the copy sheet discharging path 104. Thus, a copy having an image formed on both sides is obtained. Thus, the above-described configuration and operation of the illustrated electrostatic copying machine do not constitute a novel feature improved in accordance with the present invention, but show an example of an electrostatic copying machine to which the present invention can be applied. Rinse, therefore, a detailed description thereof will be omitted herein.

Support Frame Structure Referring to FIG. 2 together with FIG. 1, the housing 2 is composed of a lower support frame 146 and an upper support frame 148. The upper support frame 148 is the support shaft 1
It is rotatably mounted on the lower support frame 146 via 50, and pivots between an operating position (closed position) shown in FIG. 1 and a non-operating position (open position) shown in FIG. Be punished. The upper support frame 14 with respect to the lower support frame 146
The mounting system itself of No. 8 is disclosed in, for example, JP-A-59-10045
No. 9, JP-A-59-152458 or JP-A-59-188670 may be used.

Explaining with reference to FIG. 3, the lower support frame 146 has a substantially box shape with an open upper surface,
The upper support frame 148 has a substantially shape with an open lower surface. The lower support frame body 146 has a lower front substrate 152 and a lower rear substrate 154 arranged therein and arranged substantially vertically in the front-rear direction (direction perpendicular to the paper surface in FIGS. 1 and 2) with a space therebetween. Have. Similarly, the upper support frame 14
8 also has an upper front substrate 156 and an upper rear substrate 158 (FIGS. 1 and 2) which are arranged substantially vertically in the interior thereof at intervals in the front-rear direction. Among the various constituent elements described with reference to FIG. 1, the constituent elements arranged below the dashed-dotted line 160 shown in FIG. 1 are the lower front substrate 152 and the lower rear substrate 154. The components mounted between the upper front substrate 156 and the upper rear substrate 158 are mounted between the upper front substrate 156 and the upper rear substrate 158. Therefore, as will be understood by reference to FIGS. 1 and 2, in the illustrated embodiment, the entire copy paper supply paths 56a, 56b and 56c, and most of the copy paper transport path 58 (more specifically, FIG. Is a portion other than the portion defined by the heating and fixing roller pair 88), and the copy sheet discharge path 104 is lower support frame 146 when the upper support frame 148 is positioned at the operating position shown in FIG. Between the upper support frame body 148 and the upper support frame body 148, and is released when the upper support frame body 148 is brought into the inoperative position shown in FIG. In the illustrated example, the upper roller 88a of the heating and fixing roller pair 88 and its supporting means in the copy paper transport path 58 are in the operating position (closed position) shown in FIG. 1 and the non-operating position shown in FIG. Is mounted so as to be rotatable about the support shaft 162, and therefore, the upper support frame 148 is attached to the second position.
When the upper roller 88a and its supporting means are moved to the non-acting position shown in the figure and then to the non-acting position shown in FIG. 2, the entire copying paper transport path 58 is opened. On the other hand, the copy paper reversing path 108 is provided in the upper support frame 148 more specifically between the upper front substrate 156 and the upper rear substrate, and the copy paper return path 110, the copy paper retransmitting means 120 and the copy paper are provided. The resupply path 128 is provided in the lower support frame 146, and more specifically, the lower front substrate 152.
And the lower rear substrate 154.

Referring to FIG. 4 together with FIGS. 1 and 2, a relatively large single continuous opening 164 is formed in the lower front substrate 152 of the lower support frame 146. Has been done. The opening 164 is continuously formed over a region where most of the copy sheet returning means 110 exists, more specifically, a region defined by the return control mechanism 118, and a region where almost all of the copy sheet retransmitting unit 120 exists. It has been extended. In addition, the right edge of the opening 164 in FIGS. 1 and 4 is adjacent the copy paper refeed path 128. Therefore, when a copy sheet jams in the copy sheet return path 110, the copy sheet retransmitting means 120 and the copy sheet re-supply path 128, the jammed copy sheet is removed by inserting a hand through the opening 164. It can be easily removed. The return control mechanism 118 in the copy sheet return path 110 has a movable frame body 166.
The movable frame 116 is rotatable about a turning axis extending along the rear end edge thereof between a working position shown by a solid line in FIG. 4 and a non-working position shown by a two-dot chain line in FIG.
It is mounted on the lower rear substrate 154 (FIG. 3). As is clear from FIG. 4, the opening 164 exists not only in the region where the movable frame body 166 exists when it is located in the working position, but also when the movable frame body 166 exists in the non-working position. It also extends to the area. The plurality of upper elements (that is, the elements defining the upper side of the copy sheet return path 110) in the return control mechanism 118 are the lower support frame 1.
Although directly attached to the lower front substrate 152 and the lower rear substrate 154 of 46, a plurality of lower elements (that is, elements defining the upper side of the copy sheet return path 110) in the return control mechanism 118 are movable. It is attached to the frame body 166.
Therefore, when a paper jam of copy paper occurs in the return control mechanism 118, the grip portion 168 formed at the front end of the movable frame body 166 is gripped to move the movable frame body 166 from a position indicated by a solid line. The copy paper return path 110 in the return control mechanism 118 is opened by moving it to the non-acting position indicated by the chain double-dashed line, and thus the jammed copy paper can be easily removed.

Referring again to FIG. 3, the front wall of the lower support frame 146 is defined by the lower front cover member 170 which can be opened and closed. The lower front cover member 170 has a closed position (a position indicated by a chain double-dashed line in FIG. 3) that covers almost the entire front surface of the lower support frame 146 around a pivot axis 172 extending along the lower end edge thereof and a lower support. The frame 146 is mounted by an appropriate mounting mechanism (not shown) so as to be rotatable between an open position (a position shown by a solid line in FIG. 3) that exposes almost the entire front surface of the frame 146. Similarly, the portion of the front wall of the upper support frame 148 excluding the upper end is defined by an upper front cover member 174 that can be opened and closed. The upper front cover member 174 is in a closed position (a position indicated by a chain double-dashed line in FIG. 3) that covers a portion of the front surface of the upper support frame 148 excluding the upper end portion around the pivot axis 176 extending along the lower edge of the upper front cover member 174. It is mounted by an appropriate mounting mechanism (not shown) so as to be freely rotatable between an open position (a position shown by a solid line in FIG. 3) which exposes a portion of the front surface of the upper support frame 148 excluding the upper end. ing.

Locking Means and Detecting Means Referring to FIG. 5 together with FIG. 3, a supporting plate 178 extending forward from the upper front substrate 156 in the upper supporting frame 148 is fixed. The first detection element 180 is fixed to one surface of the support plate 178, and the second detection element 182 is fixed to the other surface.
The first detection element 180 may be a limit switch having a detection arm 184 and likewise the second detection element 182 may be a limit switch having a detection arm 186. A restraint member 188, which is a plate-like member extending below the support plate 178 and forward from the upper front substrate 156, is also fixed to the upper front substrate 156 of the upper support frame 148. An opening 190 located below the tip of the detection arm 184 of the first detection element 180 is formed at the tip of the restraining member 188. On the other hand, the lower front cover member 17 of the lower support frame body 146, which can be freely opened and closed.
A piece 192 is fixed to the back surface of 0. As shown clearly in FIG. 3, the free end of this piece 192 has a notch 193 formed in the upper wall of the lower front cover member 170.
Through, and projects beyond the upper end of the lower front cover member 170. As will be apparent from the description below, such a piece 192 functions as a restrained member that constitutes a locking means in cooperation with the restraining member 188, and also cooperates with the first detecting element 180 in the first detecting element 180. It functions as a detected element that constitutes the first detection means. In addition, the upper support frame 14
A piece 194 is fixed to the back surface of the upper front cover member 174 which can be opened and closed in FIG. Such a piece 194
As will be apparent from the description below, the above functions as a detected element that cooperates with the second detecting element 182 and constitutes the second detecting means.

As can be seen by referring to FIGS. 3 and 5, the lower front cover member 170 on the lower support frame 146 is brought to the closed position shown in phantom in FIG. The frame 148 is in the operating position (first
(Fig.), The tip of the piece 192 is received in the opening 190 of the restraining member 188. Thus, the forward movement of the piece 192 is restrained by the restraining member 188, so that the lower front cover member 170 is locked in the closed position shown by the chain double-dashed line in FIG. That is, in the illustrated electrostatic copying machine, when the upper support frame 148 is in the operating position (FIG. 1), the restraining member 188 and the piece 192 are provided.
The lower front cover member 170 is locked in the closed position by co-operation with, and the lower front cover member 170 cannot be moved to the open position shown by the solid line in FIG. When the upper support frame 148 is moved to the non-acting position shown in FIG. 3, the restraining member 188 is separated from the piece 192, and thus the lower front cover member 170 is moved to the open position shown by the solid line in FIG. Will be possible. When the lower front cover member 170 of the lower support frame body 146 is moved to the closed position shown by the chain double-dashed line in FIG. 3, and then the upper support frame body 148 is moved to the operating position (FIG. 1), the parts are moved as described above. Piece 192
5 is received in the opening 190 of the restraining member 188 and the lower front cover member 170 is locked in the closed position, the tip of the piece 192 has the above-mentioned first position. The detection arm 184 of the detection element 180 is pressed, whereby the first detection element 180 is switched on. When the upper front cover member 174 of the upper support frame 148 is moved to the closed position shown by the chain double-dashed line in FIG. 3, the tip of the piece 194 is moved to the second detection element 18 described above.
The second detection arm 186 is pressed, whereby the second detection element 182 is switched on. First detection element 1
The 80 and the second detection element 182 function as a so-called safety switch, and when both the first detection element 180 and the second detection element 182 are ON, the operation of the electrostatic copying machine is permitted. If desired, the constrained member and the detected element can each be composed of separate pieces. Further, the piece 192 is fixed to the upper front substrate 156 of the upper support frame 148,
The first detection element 180 and the restraining member 188 can be fixed to the lower front cover member 170 of the lower support frame body 146. Furthermore, the piece 194 can be fixed to the upper front substrate 156 of the upper support frame 148, and the second detection element 182 can be fixed to the upper front cover member 174 of the upper support frame 148.

Paper jam processing procedure : Referring to FIGS. 1, 2, and 3, the copying paper supply path 56a is operated while the electrostatic copying machine is operating in a mode in which an image is formed on only one side of the copying paper. , 56b and 56c, the copy paper transport path 58 or the copy paper discharge path 104, and when the operation of the electrostatic copying machine is stopped due to paper jam of the copy paper, the upper support frame 148 is moved to the position shown in FIG. Set it to the non-acting position shown in FIG. As a result, the entire copy paper supply paths 56a, 56b and 56c and the copy paper transport path 58 are provided.
(More specifically, a portion other than the portion defined by the heat fixing roller pair 88), and the copy paper discharge path 1
The whole 04 is opened. Then, if necessary, the upper roller 88a of the heating and fixing roller pair 88 and its supporting means are brought to the non-acting position shown in FIG. 2, and thus the entire copy paper conveyance path 58 is opened. Next, the copy paper existing in the copy paper supply paths 56a, 56b and 56c, the copy paper transport path 58 or the copy paper discharge path 104 is removed.

Next, a description will be given of the processing when the electrostatic copying machine is operated in the mode of forming images on both sides of the copying paper and the copying paper is jammed and the operation of the electrostatic copying machine is stopped. To do. In this case, the following facts should be noted. That is, in the case of so-called multiple copy in which multiple copies are obtained from the same original, for example, when the copy paper is jammed in the copy paper return path 110 or the copy paper retransmitting means 120,
As long as the jammed copy paper is not the copy paper for the final copy, there are subsequent copy papers in the copy paper supply paths 56a, 56b and 56c, the copy paper transport path 58, or the copy paper reverse path 108. It is also necessary to remove such copy paper. Thus, in the illustrated electrostatic copying machine, the copy paper return path 1 disposed in the lower support frame body 146.
10, copy paper retransmitting means 120 or copy paper resupply path 1
Even if the lower front cover member 170 is moved to the open position shown by the solid line in FIG. 3 to remove the copy paper to be removed in 28, the upper support frame 148 is moved to the working position shown in FIG. To some extent, the action of the locking means described above (ie the restraining member 188 and the piece 192) prevents the lower front cover member 170 from opening. Therefore, prior to the opening of the lower front cover member 170, the upper support frame 14
It is necessary to bring 8 into the inoperative position shown in FIGS. 2 and 3. Then, if necessary, the upper roller 88a of the heat fixing roller pair 88 and its supporting means are brought to the non-acting position shown in FIG. Then, the copy paper existing in the copy paper supply paths 56a, 56b and 56c, the copy paper transport path 58 or the copy paper reverse rotation path 108 is removed. The copy paper existing in the copy paper reversing path 108 can be removed sufficiently easily by inserting a hand from the open lower surface of the upper support frame 148. Thereafter, the lower front cover member 170 is moved to the open position shown by the solid line in FIG. Then, if necessary, the movable frame body 166 of the return control mechanism 118 is set to the non-acting position shown by the chain double-dashed line in FIG. When the lower front cover member 170 is moved to the open position, the opening 164 formed in the lower front substrate 152 is opened.
Therefore, by inserting a hand through the opening 164, the copy paper to be removed existing in the copy paper return path 110, the copy paper retransmitting means 120 or the copy paper resupply path 128 can be easily removed. You can Therefore, in the illustrated electrostatic copying machine,
For example, the copy sheet return path 110 or the copy sheet retransmitting means 1
The copy paper is removed from only 20 and the copy paper supply path 56a,
It is sufficiently certain that the copy papers 56b and 56c, the copy paper transport path 58, or the copy paper reverse path 108 are inadvertently left behind to restart the operation of the electrostatic copying machine, thus causing various inconveniences. To be prevented.

Transport Control Means Next, with reference to FIGS. 6 to 8, the transport control means 94.
Will be described in detail. As described above, the illustrated conveyance control means 94 includes the lower movable guide member 98 and the upper movable guide member 100. As shown most clearly in FIG. 8, the lower movable guide member 98 has a support shaft 196, and the support shaft 196 is provided with a plurality of substantially triangular lower guides at appropriate intervals in the axial direction. The piece 198 is integrally formed. Both ends of the support shaft 196 are respectively provided on the lower front substrate 152 and the lower rear substrate 154 of the lower support frame 146.
Rotatably mounted on the lower movable guide member 98.
Is rotatably mounted at a predetermined position of the lower support frame 146 (see also FIG. 3), and a connecting piece 200 (FIGS. 6 and 7) is also integrally formed with the support shaft 196. .
The connecting piece 200 includes an electromagnetic solenoid 202.
Activating means are connected. More specifically, the main body of the electromagnetic solenoid 202 has a lower support frame 146 (7th
The core 204 is fixed to a predetermined position in the drawing) and is pivotally connected to the connecting piece 200 by a connecting pin 206. When the electromagnetic solenoid 202 is deenergized, the lower movable guide member 98 is positioned at the position shown by the solid line in FIG. 6, that is, the lowered position. When the electromagnetic solenoid 202 is energized, the lower movable guide member 98 is
It is swung to a position shown by a chain double-dashed line in FIG. 6, that is, a raised position. The lower movable guide member 98 is further provided with a projection 20 protruding outward from the outer surface of each of the lower guide piece 198 located on both sides of the plurality of lower guide piece 198.
8 is also integrally formed. The projection 208 constitutes a contact means that acts on the upper movable guide member 100, as will be apparent from the description below. On the other hand, the upper movable guide member 100 has an elongated plate member 212 integrally formed with a plurality of substantially triangular upper guide pieces 210 at appropriate intervals in the longitudinal direction. Each of the upper guide pieces 210 is positioned corresponding to each of the plurality of lower guide pieces 198 of the lower movable guide member 98. Substantially rectangular parts 214 are integrally formed on both ends of the plate member 212, and a short shaft 216 extending outward is integrally formed on the outer surface of each of the parts 214. The piece 214 constitutes an abutted member that cooperates with the protrusion of the lower movable guide member 98, that is, the abutting member 208. Each of the short shafts 216 has an upper front substrate 156 (FIG. 3) and an upper rear substrate 158 (seventh portion) in the upper support frame 148.
In the figure, the upper movable guide member 100 is pivotally mounted at a predetermined position on the upper support frame 148. A pin 218 is integrally formed on the outer surface of the rear end of each of the upper guide pieces 210 on both sides of the plurality of upper guide pieces 210 of the upper movable guide member 100. Corresponding to this, the upper support frame 14
The pins 220 are also fixed to the inner surfaces of the upper front substrate 156 (FIG. 3) and the upper rear substrate 158 in FIG.
An elastic means, which may be a tension spring 222, is disposed between each of the pins 218 and each of the pins 220.
The tension spring 222 elastically biases the upper movable guide member 100 counterclockwise in FIG. If desired, the weight of the upper movable guide member 100 itself may cause the upper movable guide member 100 to be biased counterclockwise in FIG. Further, in the illustrated specific example, a limiting means 224 formed of a plate-like member is fixed at a predetermined position in the upper support frame 148.

In the transport control means 94 as described above, the electromagnetic solenoid 202 is placed in a state where the upper support frame 148 is positioned at the working position shown in FIG.
As described above, the lower movable guide member 98 is positioned at the lowered position shown by the solid line in FIG. The upper movable guide member 100 elastically biased counterclockwise in FIG. 6 by the tension spring 222.
The part thereof, that is, the contacted means 214, is brought into contact with the projection or contact means 208 of the lower movable guide member 98, and thus is positioned at the position shown by the solid line in FIG. 6, that is, the lowered position. Referring to FIG. 1 together with FIG. 6, when the lower movable guide member 98 and the upper movable guide member 100 are positioned at the lowered position shown by the solid line, the lower guide of the lower movable guide member 98 is shown. A copy paper movement path 96 defined between the upper edge of the piece 198 and the lower edge of the upper guide piece 210 of the upper movable guide member 100 mutually connects the copy paper transport path 58 and the copy paper discharge path 104. I can communicate.

On the other hand, when the electromagnetic solenoid 202 is urged, the lower movable guide member 98 is swung clockwise in FIG. 6 and positioned at the raised position shown by the chain double-dashed line in FIG. 6 as described above. . Thus, the upper movable guide member 100 is also elastically biased by the tension spring 222 by the projection or contact means 208 of the lower movable guide member 98 and the piece or contacted means 214 of the upper movable guide member 100 cooperating therewith. It is swung clockwise in FIG. 6 against the action and positioned in the position shown by the chain double-dashed line in FIG. 6, that is, in the raised position. Describing with reference to FIG. 1 together with FIG. 6, when the lower movable guide member 98 and the upper movable guide member 100 are positioned at the raised position shown by the chain double-dashed line, the lower guide of the lower movable guide member 98 will be described. Piece 19
8 and the lower edge of the upper guide piece 210 of the upper movable guide member 100, the copy paper movement path 96 is defined.
Makes the copy paper conveyance path 58 and the copy paper reverse rotation path 108 communicate with each other, and also makes the copy paper reverse rotation path 108 and the copy paper return path 110 communicate with each other.

The lower movable guide member 98 is the lower support frame body 14.
6 (FIG. 7), the upper movable guide member 100 is mounted on the upper support frame 148 (FIG. 7). Therefore, as shown in FIG. 7, the upper support frame body 148 moves from the operating position shown in FIG.
When moved toward the non-acting position shown in the figure,
The upper movable guide member 100 is separated upward from the lower movable guide member 98, and thus the copy paper movement path 96 (FIG. 6) defined between them is opened. When the upper movable guide member 98 is separated upward from the lower movable guide member 100, the piece of the upper movable guide member 100, that is, the contacted means 214 is separated from the protrusion of the lower movable guide member 98, that is, the contact means 208. To do. Therefore, the tension spring 222
Due to the elastic biasing action of, the upper movable guide member 100 is swung counterclockwise in FIG. However, when the upper movable guide member 100 is pivoted in a counterclockwise direction, one or more rear end upper edges of the upper guide portion pieces 210 of the upper movable guide member 100 are fixed to the upper support frame body 148. The upper movable guide member 100 is further prevented from pivoting counterclockwise in FIG. 7 by abutting against the restricted means 224. If desired, the upper guide piece 21 of the upper movable guide member 100 with the upper support frame 148 in the non-acting position and the electromagnetic solenoid 202 deenergized.
The upper edge of the rear end portion of 0 abuts on the limiting means 224, whereby the upper movable guide member 100 is positioned at the lowered position shown by the solid line in FIG. 6, and at this time, the projection or contact of the lower movable guide member 98. Means 208 and upper movable guide member 10
It is also possible that there is a slight gap between the piece 0 and the contacted means 214. Further, when the upper movable guide member 100 is biased to the raised position and the lower movable guide member 98 is moved to the lowered position, the upper movable guide member 100 is moved to the lowered position by the action of the contact means and the contacted means. You can also do so. Contrary to the illustrated example, the upper movable guide member 100 is provided with an operating means such as an electromagnetic solenoid so that the upper movable guide member 100 moves from the raised position (or lowered position) to the lowered position (or raised position). The lower movable guide member 98, which is biased to the raised position (or the lowered position) when it is biased, may be biased to the lowered position (or the raised position) by the action of the contact means and the contacted means. it can.

The specific example of the electrostatic copying machine constructed according to the present invention has been described in detail with reference to the accompanying drawings. However, the present invention is not limited to the specific example, and the scope of the present invention is not limited thereto. It is not necessary to say that various changes and modifications can be made without departing from the above.

[0034]

The electrostatic copying machine according to the present invention comprises a lower supporting frame and an upper supporting frame mounted on the lower supporting frame so as to be rotatable between an operating position and a non-operating position. The lower movable guide member, which constitutes the conveyance control means disposed adjacent to the downstream end of the copy paper conveyance path, is mounted on the lower support frame body, and the upper movable guide member is mounted on the upper support frame body. , One of the upper movable guide member and the lower movable guide member is biased to one of the lowered position and the raised position, the other of the upper movable guide member and the lower movable guide member, An actuating means for selectively positioning it in the lowered position and the raised position is provided, and an abutting means is formed on the other of the upper movable guide member and the lower movable guide member to form the upper movable guide member and the lower movable guide member. A contacted means is formed on one side of the movable guide member. When the other of the upper movable guide member and the lower movable guide member is moved from one of the lowered position and the raised position to the other, the contact means acts on the contacted means and the upper movable guide member and the lower movable guide member. Since one of the side movable guide members is forcibly moved to the other of the lowered position and the raised position, when the upper support frame is moved to the non-acting position, the lower movable guide member and the upper movable guide member are moved. The lower movable guide member and the upper movable guide member can be positioned in the lowered position and the raised position, despite the opening of the copy paper movement path between the two. .

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing main components of an electrostatic copying machine configured according to the present invention.

2 is a sectional view similar to FIG. 1, showing a state in which an upper support frame body in the electrostatic copying machine of FIG. 1 is in a non-operating position.

FIG. 3 shows a support frame structure in the electrostatic copying machine of FIG.
FIG. 3 is a simplified perspective view showing the upper support frame body in a non-acting position.

4 is a partial front view showing a part of a lower front substrate of a lower support frame in the electrostatic copying machine of FIG.

5 is a partial perspective view showing locking means and detection means in the electrostatic copying machine of FIG.

FIG. 6 is a partial cross-sectional view showing a conveyance control means in the electrostatic copying machine of FIG.

FIG. 7 shows a conveyance control means in the electrostatic copying machine of FIG.
FIG. 7 is a partial cross-sectional view similar to FIG. 6, showing a state in which the upper support frame has been moved somewhat from the operating position to the non-operating position.

8 is a partial perspective view showing a conveyance control means in the electrostatic copying machine of FIG.

[Explanation of symbols]

 2: housing 8: rotating drum 48: copy paper supply means 56a, 56b, 56c: copy paper supply path 58: copy paper transport path 94: transfer control means 96: copy paper movement path 98: lower movable guide member 100: upper side Movable guide member 104: Copy paper discharge path 108: Copy paper reverse rotation path 110: Copy paper return path 118: Return control mechanism 120: Copy paper resending means 128: Copy paper resupply path 146: Lower support frame 148: Upper support frame Body 152: Lower front substrate 154: Lower rear substrate 156: Lower front substrate 158: Upper rear substrate 164: Lower front substrate opening 170: Lower front cover member 174: Upper front cover member 180: First detection element (detection means) 182. Second posting element (detection means) 188: Restraining member (locking means) 192: Piece (restrained means and detected element) 194: Piece (detected element) 196: Support shaft 198: Lower guide piece 200: Connecting piece 202: Electromagnetic solenoid (operating means) 208: Protrusion (contact means) 210: Upper guide piece 214: Piece (Abutting means) 222: Tension spring (elastic means) 224: Limiting means

Claims (6)

(57) [Claims] 1. A lower supporting frame, an upper supporting frame mounted on the lower supporting frame so as to be rotatable between an operating position and a non-operating position, a copy sheet conveying path, and the copy sheet conveying path. From the upstream end adjacent to the downstream end of the transfer control means, and the transfer control means disposed adjacent to the downstream end of the copy paper transfer path. A copy paper discharge path, a copy paper reverse 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. At least most of the copy paper transport path is defined between the lower support frame and the upper support frame when the upper support frame is positioned at the operating position, and the upper support frame is When the body is moved to the non-acting position, it is released, Is provided in the upper support frame, the copy paper return path is provided in the lower support frame, and the transport control means is a lower movable part that defines a copy paper movement path therebetween. A lower movable guide member and an upper movable guide member, wherein the lower movable guide member and the upper movable guide member connect the downstream end of the copy paper transport path and the upstream end of the copy paper discharge path to a raised position; The copy paper fed to the copy paper feed path from the copy paper feed means is selectively positioned at a descending position for connecting the downstream end of the copy paper feed path and the upstream end of the copy paper reverse rotation path. An image is formed on one side of the copy sheet while being conveyed through the copy sheet conveying path, and the copy sheet having the image formed on one side is positioned at the lower position of the lower movable guide member. Between the upper movable guide member and The copy paper introduced into the copy paper discharge path through the moving path and then discharged through the copy paper discharge path, or the copy paper having an image formed on one side thereof is provided with the lower movable guide member positioned in the raised position. It is introduced into the copy paper reversing path through the copy paper moving path between the upper movable guide member, and then the trailing edge of the copy paper is reversed in the moving direction of the copy paper after passing the downstream end of the copy paper conveying path. Is introduced into the copy paper return path, returned through the copy paper return path, re-supplied to the copy paper transport path, and an image is formed on the other surface of the copy paper while being re-transferred through the copy paper transport path. Formed and then introduced into the copy paper discharge path through a copy paper movement path between the lower movable guide member and the upper movable guide member, which are positioned in the lowered position, and then the copy paper discharge path. Through In a discharge type electrostatic copying machine; the lower movable guide member is attached to the lower support frame body, the upper movable guide member is attached to the upper support frame body, and the upper support frame body is When set to the non-acting position, the copy paper movement path between the lower movable guide member and the upper movable guide member is opened, and either the upper movable guide member or the lower movable guide member is opened. Is biased to one of the lowered position and the raised position, and the other of the upper movable guide member and the lower movable guide member is selectively placed between the lowered position and the raised position. And an abutting means is formed on the other of the upper movable guide member and the lower movable guide member, and the upper movable guide member and the lower movable guide member are connected to each other. An abutted means is formed on one side of the upper movable guide member. When the other of the lower movable guide member is moved from the one of the lowered position and the raised position to the other, the contact means acts on the contacted means and the upper movable guide member and An electrostatic copying machine characterized in that one of the lower movable guide member is forcibly moved to the other of the lowered position and the raised position. 2. When the other of the upper movable guide member and the lower movable guide member is in the one of the lowered position and the raised position, the corresponding contact means contacts the contacted means. By the one of the upper movable guide member and the lower movable guide member is limited to the one of the lowered position and the raised position,
The electrostatic copying machine according to claim 1. 3. A control means is provided on either one of the upper support frame and the lower support frame, and the upper movable guide is provided even when the upper support frame is set to the non-acting position. The one of the upper movable guide member and the lower movable guide member may be moved beyond a predetermined limit position by contacting the one of the member and the lower movable guide member with the limiting means. The electrostatographic copying machine of claim 2, wherein the electrostatographic copying machine is blocked. 4. The upper movable guide member is lowered between the one of the upper movable guide member and the lower movable guide member and the one of the upper support frame body and the lower support frame body. Elastic means for elastically biasing in a direction is provided.
The described electrostatic copying machine. 5. The actuating means is composed of an electromagnetic solenoid, and when the electromagnetic solenoid is deenergized, the other of the upper movable guide member and the lower movable guide member has the lower position and the lower position. When the electromagnetic solenoid is energized, the other of the upper movable guide member and the lower movable guide member is positioned at the other of the lowered position and the raised position. The electrostatic copying machine according to claim 1. 6. The copy paper discharge path is defined between the lower support frame and the upper support frame when the upper support frame is positioned at the operating position, and the upper support frame is defined by the upper support frame. The electrostatic copying machine according to claim 1, wherein the electrostatic copying machine is opened when the frame is brought to the non-acting position.