JP2528318B2 - Electrostatic copier - Google Patents

Description

Description: TECHNICAL FIELD 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 copy sheet as needed.

<Prior art> From the standpoint of saving copy paper and reducing the number of stored documents,
It is often desired to form an image on both sides of a copy sheet, and therefore, in recent years, an electrostatic copying machine that can form an image on both sides of a copy sheet has been proposed and put into practical use. Has come to be offered to.

A typical example of such an electrostatic copying machine is a copy paper conveyance path,
A copy paper supply unit for supplying sheet copy paper to the copy paper transport path, a copy paper return path, a copy paper returned through the copy paper return path, and a copy paper receiving path for the copy paper received path. It is provided with a copy paper retransmitting means for re-feeding. In such an electrostatic copying machine, the copy paper supplied from the copy paper supply means to the copy paper transport path is
An image is formed on one side of the copy paper while being 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 having the image formed on one side is discharged as it is from the copying machine.
On the other hand, when it is desired to form an image on both sides of the copy paper, the copy paper having the image formed on one side is introduced into the copy paper return path, and is passed through the copy paper return path to the copy paper retransmitting means. Accepted. After that, the copy paper is re-supplied from the copy paper retransmitting means to the copy paper transport path, and an image is formed on the other surface of the copy paper while being re-transported through the copy paper transport path, thus forming an image on both sides. The copy paper is discharged outside the copying machine.

However, the conventional electrostatic copying machine described above has the following problems to be solved. That is, when a paper jam occurs in the copy paper return path (or copy paper retransmitting means), it is difficult to remove the jammed paper relatively easily, and the operation for that is complicated.

<Purpose of the Invention> The present invention has been made in view of the above facts, and its main purpose is to remove the jammed paper relatively easily when a paper jam occurs in the copy paper return path and its vicinity. An object is to provide an electrostatic copying machine that can be removed.

<Summary of the Invention> In order to achieve the above object, according to the first invention,
Copy paper conveyance path, copy paper supply means for supplying sheet copy paper to the copy paper conveyance path, copy paper return path, copy paper that has received and received copy paper returned through the copy paper return path And a copy paper re-sending means for re-supplying the copy paper to the copy paper transport path, while the copy paper supplied from the copy paper supply means to the copy paper transport path is transported through the copy paper transport path. ,
An image is formed on one side of the copy paper, and the copy paper on which the image is formed on one side is selectively introduced into the copy paper return path and returned to the copy paper retransmitting means through the copy paper return path, Then, in an electrostatic copying machine of the type in which an image is formed on the other surface of the copy paper while being re-supplied from the copy paper retransmitting means to the copy paper conveyance path and being re-conveyed through the copy paper conveyance path; The copy paper returning path is defined by copy paper returning means for feeding the copy paper introduced into the copy paper returning path to the copy paper retransmitting means, and the copy paper returning means includes a return mechanism and a return control mechanism,
An upstream side of the copy paper return path is defined between a plurality of one-side elements and a plurality of other-side elements of the return mechanism, and the one side element and the plurality of other-side elements of the return control mechanism are defined. A downstream side portion of the copy paper return path is defined between them, and further, the plurality of one-sided elements of the return control mechanism are mounted so as to be movable between a closed position and an open position for retracting upward. A first movable frame body provided and configured to be biased toward the open position; and the first movable frame body against the biasing force acting on the first movable frame body. An electrostatic copying machine comprising: a first holding unit that releasably holds in a closed position.

Further, according to the second aspect of the present invention, the copy paper transport path, the copy paper supply means for supplying the sheet copy paper to the copy paper transport path, the copy paper return path, and the copy paper return path are returned. A copy paper retransmitting means for receiving the copy paper and re-supplying the received copy paper to the copy paper transport path, wherein the copy paper supplied from the copy paper supply means to the copy paper transport path is While being transported through the copy paper transport path,
An image is formed on one side of the copy paper, and the copy paper on which the image is formed on one side is selectively introduced into the copy paper return path and returned to the copy paper retransmitting means through the copy paper return path, Then, in an electrostatic copying machine of the type in which an image is formed on the other surface of the copy paper while being re-supplied from the copy paper retransmitting means to the copy paper conveyance path and being re-conveyed through the copy paper conveyance path; The copy paper returning path is defined by copy paper returning means for feeding the copy paper introduced into the copy paper returning path to the copy paper retransmitting means, and the copy paper returning means includes a return mechanism and a return control mechanism,
An upstream side of the copy paper return path is defined between a plurality of one-side elements and a plurality of other-side elements of the return mechanism, and the one side element and the plurality of other-side elements of the return control mechanism are defined. A downstream side portion of the copy paper return path is defined between them, and further, the plurality of one-sided elements of the return control mechanism are mounted so as to be movable between a closed position and an open position for retracting upward. A first movable frame body that is provided, and a second movable frame body that is rotatably disposed below the first movable frame body and is equipped with the plurality of other elements of the return control mechanism. An electrostatic copying machine is provided, comprising: an actuating unit that pivots the second movable frame body from the operating position when the first movable frame body is pivoted toward the open position. .

<Preferred Specific Example of the Invention> A specific example of an electrostatic copying machine configured according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 schematically shows main components in an embodiment of an electrostatic copying machine constructed according to the present invention. The electrostatic copying machine shown in FIG. 1 includes a housing 2 having a substantially rectangular parallelepiped 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. Around the rotary drum 8 which is rotationally driven in the direction shown by the arrow 10, when viewed in the direction shown by the arrow 10, the charging area 12 and the exposure area
14, a developing area 16, a transfer area 18 and a cleaning area 20 are provided. 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. The cleaning area 20 is provided with a residual toner removing blade 32.

Above the rotary drum 8, an optical system generally designated by the numeral 34 is arranged. The optical system 34 includes a movable original illumination lamp 36, a first movable reflecting mirror 38, a second movable reflecting mirror 40, and a third movable reflecting mirror 40.
Movable reflector 42, stationary lens assembly 44 and stationary reflector 46 of
Is included. Movable original illumination lamp for scanning exposure
36 and the first movable reflecting mirror 38 are moved substantially horizontally to the right from the scanning exposure starting position shown in FIG. 1 to the maximum scanning exposure ending position, for example, at the required speed V, and the second movable reflecting mirror 40 is moved. The third movable reflecting mirror 42 is moved substantially horizontally to the right from the scanning exposure start position shown in FIG. 1 to the maximum scanning exposure end position at a speed V / 2 which is half the required speed. At this time, the manuscript placed on the transparent plate 4 is illuminated by the movable manuscript illumination lamp 36, and the reflecting mirror from the manuscript is divided into the first, second and third parts as shown by the one-dot chain line in FIG. Are sequentially reflected by the movable reflecting mirrors 38, 40 and 42 to reach the lens assembly 44, and then are reflected by the stationary reflecting mirror 46 and projected onto the photoconductor in the exposure area 14. When the scanning exposure is completed, the movable original illumination lamp 36 and the first and second movable illumination lamps 36
The third reflecting mirrors 38, 40 and 42 are returned to the scanning exposure start position.

At one end of the housing 2, that is, at the right end in FIG. 1, there is provided copy paper feeding means generally designated by numeral 48. The illustrated copy paper feeding means 48 includes a lower cassette receiving portion 50.
a, an intermediate cassette receiving portion 50b and an upper cassette receiving portion 50c are included. The lower cassette receiving portion 50a, the intermediate cassette receiving portion 50b, and the upper cassette receiving portion 50c each have several types of copy paper cassettes that store sheet copy papers of different sizes.
Any one of 52 is selectively and detachably mounted.
Each of the lower cassette receiving portion 50a, the intermediate cassette receiving portion 50b, and the upper cassette receiving portion 50c has a delivery roller for delivering one copy sheet from the copy sheet cassette 52 mounted therein.
54a, 54b and 54c are provided. Lower cassette receiving part 5
The copy sheet sent from the copy sheet cassette 52 mounted on 0a is introduced into the copy sheet conveying path indicated by numeral 58 through the copy sheet feeding path 56a. The copy paper sent from the copy paper cassette 52 mounted on the intermediate cassette receiver 50b is
It is introduced into the copy paper transport path 58 through the copy paper feed paths 56b and 56a. The copy paper sent from the copy paper cassette 52 mounted on the upper cassette receiving portion 50c is transferred to the copy paper feeding path 56.
It is introduced into the copy paper conveyance path 58 through c, 56b and 56a. The copy paper feed path 56a is defined by the guide plates 62 and 64, the copy paper feed path 56b is defined by the guide plates 66, 68 and 70 and the feed roller pair 72, and the copy paper feed path is also defined.
56c is defined by guide plates 68, 70, 74 and 76 and a pair of feed rollers 78. The illustrated copy paper supply means 48 further includes a paper feed table mechanism 80. The paper feed table mechanism 80 includes a vertically movable table (not shown), and a delivery roller 82 is arranged above the table. The copy paper sent from the table mechanism 80 is transferred to the copy paper feeding path 56.
It is introduced into the copy paper conveyance path 58 through d and the copy paper re-supply path (described later). The copy paper feeding path 56d is provided with the guide plate 8
4 and 86 and the feed roller pair 88.

The copy paper transport path 58 extends from the upstream end 90 to the downstream end 92 substantially horizontally from right to left in FIG. The copy paper transport path 58 is provided at the downstream portion of the guide plate 64 and the guide plate.
Downstream of 94, a pair of transport rollers 96, a pair of guide plates 98, a pair of transport rollers 100, a guide plate 102, the transfer area 18 (that is, between the rotary drum 8 and the corona discharger 26 for transfer and the corona discharger 28 for peeling). ), The transport belt mechanism 104, the guide plate 106, the heat fixing roller pair 108, the guide plate pair 110, and the transport roller pair 112.

A transport control unit 114 is disposed adjacent to the downstream end 92 of the copy paper transport path 58. This transport control means 144,
It includes a lower movable guide member 118 and an upper movable guide member 120 that define a copy paper moving path 116 between them. The lower movable guide member 118 and the upper movable guide member 120 are selectively positioned at the lowered position shown by the solid line and the raised position shown by the chain double-dashed line. A copy paper discharge path 124 having a discharge roller pair 112 is provided on the downstream side of the conveyance control means 114. And
A receiving tray 126 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 114, a copy paper reverse path indicated by the numeral 128 and a copy paper return path indicated by the numeral 130 are provided. The copy paper reversing path 128 defined by the guide plate pair 132 extends in an appropriate curved shape from the upstream end adjacent to the downstream end of the transport control means 114. At the upstream end of the copy paper reversing path 128, a reversing roller 134 that is selectively positioned between a non-acting position shown by a solid line and a working position shown by a chain double-dashed line is arranged.
The copy sheet return path 130 extends from the upstream end adjacent to the upstream end of the conveyance control means 114 to the left to the right in FIG. The copy paper returning path 130 is defined by the copy paper returning means 136, that is, the returning mechanism 138 arranged on the upstream side and the returning control mechanism 140 arranged on the downstream side. The copy paper returning means 136 will be described later. As can be easily understood by referring to FIG. 1, the lower movable guide member 1 of the transfer control means 114 is shown.
When the 18 and the upper movable guide member 120 are positioned at the lower position shown by the solid line, the copy paper conveyance path 58 and the copy paper discharge path 124 communicate with each other via the copy paper movement path 116 in the conveyance control means 114. To be done. On the other hand, when the lower movable guide member 118 and the upper movable guide member 120 are positioned at the ascending position shown by the chain double-dashed line, the copy paper conveyance path 58 and the copy paper reverse rotation path 128 become the copy paper movement path in the conveyance control means 114. The copy paper reversing path 128 and the copy paper returning path 130 are made to communicate with each other via 116, and the conveyance control means 11 is provided.
They are made to communicate with each other via the copy paper moving path 116 at 4.

In the electrostatic copying machine shown in the figure, a copy paper retransmitting unit indicated by reference numeral 141 is provided below the copy paper returning path 130. The copy sheet retransmitting means 141 has a receiving table 142. In the specific example, the front part of the pedestal 142 is defined by the upper surface of the receiving block 144, and the rear part thereof is provided on the upper surface of the receiving block 144 at intervals in the width direction (direction perpendicular to the paper surface in FIG. 1). Is defined by the upper edge of the butt strip 146. The rear portion of the pedestal 142 extends slightly downward in the copy sheet feeding direction, and the front portion thereof extends substantially horizontally. Stop means 148 is provided at the front end of the pedestal 142, that is, at the right end in FIG. The stopping means 148 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 150 is provided on the front end of the pedestal 142. The feeding roller 150 can freely move upward from a position in contact with the upper surface of the pedestal 142 (a position indicated by a chain double-dashed line in FIG. 1) to a predetermined position (a position indicated by a solid line in FIG. 1). And is forced downward by the biasing action of its own weight (optional spring means if necessary).

Further, there is provided a copy paper re-feeding path indicated by reference numeral 152, which extends from the front end of the copy paper retransmitting means 141 to the upstream end 90 of the copy paper transport path 58. The copy sheet re-supply path 152 includes a separation roller pair 154, a guide plate pair 156, a re-supply roller pair 158, a guide plate pair 160, a re-supply roller pair 162, guide plates 84, 86, 164, a re-supply roller pair 168, and Information board 94, 170
Stipulated by

The operation of the illustrated electrostatic copying machine as described above will be outlined below.

The rotating drum 8 is rotated in the direction indicated by the arrow 10,
In the charging area 12, the surface of the photoconductor on the rotary drum 8 is charged to a specific polarity by the charging corona discharger 26, and in the exposure area 14, the image of the original placed on the transparent plate 4 is converted into the optical system. Scanning exposure is performed on the photoconductor by 34, thus forming an electrostatic latent image on the photoconductor. In development 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 (conveyance of copy paper is 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. Then, the copy paper is peeled from the photoconductor by the action of the peeling corona discharger 28. The peeled copy paper is heated by a fixing roller pair 108.
The toner image is fixed on the copy sheet as it is conveyed to the roller pair 108. On the other hand, in the cleaning area 20,
The residual toner removing blade 32 removes the residual toner from the surface of the photoconductor.

The conveyance of copy paper will be described below.
First, a case of forming an image on only one side of copy paper will be described. In this case, the lower movable guide member 118 and the upper movable guide member 120 of the conveyance control unit 114 are positioned at the lowered position shown by the solid line. . Lower cassette receiver 50a,
The copy paper introduced to the copy paper transport path 58 from the copy paper cassette 52 mounted on the intermediate cassette receiving portion 50b or the upper cassette receiving portion 50c or the table (not shown) of the paper feeding table mechanism 80 is the copy paper. It is transported through the transport path 58. During this time, one side (that is, the upper surface) of the copy paper in the transfer area 18
The toner image is transferred onto the copy sheet, and the toner image is fixed on one side of the copy sheet by the action of the heating and fixing roller pair 108, thus forming an image on one side of the copy sheet. Then, the copy paper is transferred from the copy paper transfer path 58 to the transfer control means 114.
Through the copy paper moving path 116 in
And is discharged to the tray 126 through the copy paper discharge path 124. Thus, a copy having an image formed on one side thereof is obtained.

When images are formed on both sides of the copy paper, first, the lower movable guide member 118 and the upper movable guide member 120 of the conveyance control unit 114 are positioned at the raised position indicated by the chain double-dashed line.
Next, when the copying process is started, the lower cassette receiving portion 50
a, a copy paper cassette 52 mounted on the intermediate cassette receiving portion 50b or the upper cassette receiving portion 50c, or a paper feeding table mechanism
The copy paper introduced from the table 80 (not shown) into the copy paper transport path 58 is transported through the copy paper transport 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 180, and thus the one side of the copy paper. An image is formed on.
The copy paper from the copy paper conveyance path 58 is introduced into the copy paper reverse rotation path 128 through the copy paper movement path 116 in the conveyance control means 114, and proceeds through the copy paper reverse rotation path 128. At this time, the lower surface of the copy paper comes into contact with one of the pair of discharge rollers 122, which is being driven to rotate in a predetermined direction, located above the discharge roller pair 122, but slippage occurs between the one discharge roller and the copy paper. Therefore, the copy paper can travel in a predetermined direction, even though such rollers are rotationally driven. When the trailing edge of the copy paper passes through the downstream end of the copy paper transport path 58, that is, the nip portion of the transport roller pair 112, the reversing roller 134 provided at the upstream end of the copy paper reversing path 128 operates as indicated by a chain double-dashed line. The copy paper is pressed against the one roller of the discharge roller pair 122. In this case, the copy sheet is made to move forward and backward by the action of the one discharge roller that is being driven to rotate in the predetermined direction. Then, it is introduced into the copy paper returning path 130 through one of the rollers located below the conveying roller pair 92 and one of the guide plate pair 172, and advances through the copy paper returning path 130. The reverse rotation roller 134 in the copy paper reverse path 128 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 130.

The copy sheet advanced through the copy sheet returning path 130 is guided to the receiving table 142 of the copying sheet retransmitting means 141, and the receiving table 142.
Proceed above to the right in FIG. And the feeding roller 15
0 acts on the copy paper to feed it further to the right, and thus the front end of the copy paper is brought into contact with the stop means 148 located in the working position shown by the solid line. That way,
The copy paper is prevented from proceeding, and the copy paper is retransmitted to the copy paper 141.
It can be stopped at the required position above. Even if the feeding roller 150 is rotated at this point, the feeding roller 150
A slip is created between the copy paper and the copy paper, and the copy paper cannot be advanced further.

When the required number of copy sheets are returned to the copy sheet retransmitting means 141 as described above, the lower movable guide member 118 and the upper movable guide member 120 of the transport control means 114 are returned to the lowered position shown by the solid line. Then, the stop means 148 in the copy paper retransmitting means 141 is positioned at the non-acting position shown by the chain double-dashed line,
By the action of the feeding roller 150 which is rotationally driven in a predetermined direction, the copy paper is re-supplied from the copy paper retransmitting means 141 to the copy paper resupply path 1
Sent to 52. The copy papers sent to the copy paper re-supply path 152 are advanced one by one through the copy paper re-supply path 152 and are supplied again to the copy paper transport 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 resupply path 152, 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, the toner image is transferred to the other surface of the copy paper, that is, the upper surface in the transfer area 18, and the toner image is fixed on the copy paper by the action of the heating and fixing roller pair 108, and thus the image is formed on the other surface of the copy paper. It is formed. Next, the copy paper is introduced from the copy paper transfer path 58 to the copy paper discharge path 124 through the copy paper moving path 116 in the transfer control means 114, and is discharged to the tray 126 through the copy paper discharge path 124. Thus, a copy having an image formed on both sides is obtained.

Thus, the above-described configuration and operation of the illustrated electrostatographic copying machine is merely an example of the electrostatographic copying machine to which the present invention can be applied, and therefore a detailed description thereof will be given. It is omitted in this specification.

Next, referring to FIG. 2 together with FIG. 1, the copy paper returning means 136 and its related elements will be described. The returning mechanism 138 of the illustrated copy paper returning means 136 includes a plurality of one-side elements that define one side of the upstream side of the copy paper return path 130 and a plurality of other side elements that define the other side of the upstream side. In a specific example, the plurality of one-sided elements are the return rollers 17
4, guide plate 176, return roller 178, guide plate 180, return roller
182 and a guide plate 184. The other elements on the other side are a return roller 186, a guide plate 188, a return roller 190, and a guide plate 1.
92, a return roller 194 and a guide plate 196.
Further, the return control mechanism 140 includes a plurality of one-side elements that define one of the downstream side portions of the copy paper return path 130 and a plurality of other-side elements that define the other side of the downstream side portion. The plurality of one-sided elements are composed of a return roller 198, a guide plate 200, a return roller 202, a guide plate 204 and a return roller 206, and the other side elements are a return roller 208, a swing member 210, a return roller 212, It is composed of a swing member 214 and a return roller 216.

In such a copying machine, a plurality of one-side elements and a plurality of other-side elements of the return control mechanism 140 are further opened. More specifically, in the specific example, the first movable frame member 2 is provided between the front substrate (not shown) and the rear substrate 218 of the copying machine.
20 is mounted so that it can swing. First movable frame 220
Has a front wall (not shown) and a rear wall 222 which are arranged at intervals in the front-rear direction. One ends of the front wall and the rear wall 222 extend above the receiving projection 146 to the right in FIGS. 1 and 2, and the other ends thereof extend upward. In the specific example, the protrusions 2 are formed in the substantially central portions of the front wall and the rear wall 222.
24 (only the one provided on the rear wall 222 is shown in FIG. 2) is provided, and a protrusion (not shown) provided on the front wall is rotatably attached to the front substrate via a pin member. The protrusion 224 provided on the rear wall 222 is rotatably attached to the rear substrate 218 via the pin member 226. And
A plurality of one-sided elements of the return control mechanism 140 are attached to one end of the first movable frame 220. That is, the first movable frame 22
Return rollers 198, 202 and 206 between the front and rear walls 222 of 0
Is rotatably mounted, and guide plates 200 and 204 are mounted. Further, in the specific example, most of the other elements of the returning mechanism 138 are mounted on the other end of the first movable frame 220. That is, in the specific example, the first movable frame 22
Between the other ends of the front wall 0 and the rear wall 222 of 0, return rollers 190 and 1
94 is rotatably mounted, and guide plates 192 and 196 are mounted. In the specific example, the remaining elements of the plurality of one-side elements and the plurality of other-side elements of the returning mechanism 138 are mounted on the front substrate (not shown) and the rear substrate 218 as required. That is, the return rollers 174, 178, 182 and 186 are rotatably mounted between the front substrate and the rear substrate 218, and the guide plates 176 and 18
0, 184 and 188 are mounted between the front substrate and the rear substrate 218. Thus, as can be understood from FIGS. 2 and 3, the first movable frame body 220 can swing between the closed position shown in FIG. 2 and the open position shown in FIG. When the copying paper is returned to the open position, the copying paper returning path 130 opens from the nip portion of the return rollers 178 and 190 to the nip portion of the transport rollers 206 and 216.

In the specific example, the second movable frame body 228 is disposed below the first movable frame body 220. The second movable frame 228 is also a front wall (not shown) and a rear wall that are arranged at intervals in the front-rear direction.
230, and one end of the front wall and the rear wall 230 has a connecting plate 23.
Connected via 2. In the specific example, the other end of the front wall (not shown) of the second movable frame 228 is rotatably connected to the substantially central portion of the first movable frame 220 via a pin member (not shown). The other end of the rear wall 230 is rotatably connected to a substantially central portion of the first movable frame 220 via a pin member 234.
A plurality of other elements of the return control mechanism 140 are mounted between the front wall and the rear wall 230 as required. That is, in the specific example, the return rollers 208, 212, and 216 are rotatably mounted between the front wall (not shown) and the rear wall 230, and the swing members 210 and 21.
4 is a support shaft 23 rotatably mounted between the front wall and the rear wall 230
It is fixed to 6 and 238 (a plurality of swing members 210 and 214 are provided at intervals in the axial direction of the support shafts 236 and 238, and one of each of them is shown in FIGS. 1 to 3. Indicates).

One end of the first movable frame 220 and one end of the second movable frame 228 are further connected as follows. That is, in the specific example, the short shaft 240 is planted on the inner surface at the one end of the rear wall 222 of the first movable frame body 220, and the second movable frame body 2 is provided.
A short shaft 242 is also planted on the inner surface of one end of the rear wall 230 of the 28, and one end of the connecting member 244 is rotatably connected via the short shaft 242. A long hole 246 is formed in the connecting member 244, and a short shaft 240 provided in the first movable frame 220 is movably received in the long hole 246. Thus, as can be understood from FIGS. 2 and 3, when the first movable frame 220 is in the closed position, the short shaft 240 is positioned at one end of the long hole 246 of the connecting member 244. However, when the first movable frame 220 is rotated by a predetermined angle in the direction indicated by an arrow 248 (FIG. 3) toward the open position, the short shaft 240 comes into contact with the other end of the long hole 246, When the first movable frame 220 is further rotated beyond a predetermined angle, the second movable frame 228 is also rotated in the direction shown by the arrow 248 as the first movable frame 220 is rotated in the direction shown by the arrow 248.

In this way, the one end is rotatably connected to the second movable frame 228 and the connecting member 244 having the elongated hole 246 and the first movable frame 220 is provided with the elongated hole 246 of the connecting member 244. The matching short shaft 240 constitutes an actuating means for turning the second movable frame body 228 from the working position when the first movable frame body 220 is turned toward the open position.

In the specific example, further, in order to releasably hold the first movable frame body 220 in the closed position, the first holding means 250 and the second holding means 250 are provided.
Second holding means 252 for holding the movable frame body 228 in the working position shown in FIG. 2 is provided. To further describe with reference to FIGS. 2 and 3, the first holding means 250 comprises a first member 254 and a second member 256 slidably mounted within the first member 254. . One end of the first member 254 is fixed to a shaft member 258 rotatably mounted between a front substrate (not shown) and a rear substrate 218, and the first member 2
A biasing means 260 such as a coil spring for biasing the second member 256 in the extension direction is interposed between the 54 and the second member 256, and a roller 262 is freely rotatable at the tip of the second member 256. Is attached to. In the specific example, further, one end of the shaft member 258 penetrates a front substrate (not shown) and projects forward, and the scanning lever 264 (see FIGS. 2 and 3) is attached to the projecting end of the shaft member 258. (Indicated by the dotted chain line). Further, in relation to the first holding means 250, a plate member 266 is fixed between the front wall (not shown) and the rear wall 222 of the first movable frame body 220, and the upper surface of this plate member 266. The roller 262 is designed to work. In the specific example, the first movable frame 220 is also configured to be biased in the direction indicated by the arrow 248 by the self-weight of itself and the various components attached thereto, and in this connection, Blocking means (not shown) for blocking the swinging motion of the first movable frame 220 beyond the open position is attached. Since this is the case, when the operating lever 264 is operated to the release position shown in FIG. 3, the roller 262 of the first holding means 250 separates from the plate member 266 of the first movable frame 220, By rotating a part of the first movable frame 220 in the direction indicated by the arrow 248 and contacting the blocking means (not shown), the first movable frame 220 is moved to the open position shown in FIG. Held in. On the other hand, when the operation lever 264 is operated to the locked position shown in FIG. 2, the roller 2 of the first holding means 250 is moved as shown in FIG.
62 acts on the upper surface of the plate member 266 of the first movable frame body 220 to rotate it in the direction opposite to the direction indicated by the arrow 248.
The movable frame body 250 is held in the closed position shown in FIG. In the specific example, one end of the plate member 266 is bent upwards, and therefore the roller 262 of the first holding means 250.
Is abutted against this bent portion, the operation lever 264
The turning motion of the vehicle beyond the above lock position is reliably prevented.

Further, the second holding means 252 includes a support member 268 rotatably arranged below the second movable frame 228, and a roller 270 is rotatably attached to the tip of the support member 268. ing. Although not shown in the drawings, the operating lever
264 and this support member 268 are drivingly connected via a gear train, and when the operating lever 264 is in the lock position, the support member 268 is in the operating position shown in FIG. 2 (when in this operating position, the supporting member 268 is substantially When the operating lever 264 is releasably positioned, the supporting member 268 is in the non-acting position shown in FIG. 3 (when in the non-acting position, the supporting member 268 is the second movable frame body). 228
(Located substantially horizontally below the cradle 142).

In the specific example, an electromagnetic solenoid (not shown) is attached to each of the support shafts 236 and 238.
When a relatively long copy sheet is returned through the copy sheet return path 130, one electromagnetic solenoid (not shown) is energized and the swing member 210 is moved to the position shown by the solid line in FIG.
(The position shown in FIGS. 3 and 4) to the position shown by the chain double-dashed line in FIG. Therefore, a relatively long copy sheet is guided by the lower surface of the swing member 210 and received by the upper edge of the receiving projection 146, that is, the receiving table 142. Further, when an intermediate length copy sheet is returned through the copy sheet return path 130, the other electromagnetic solenoid (not shown) is energized to cause the swing member 214.
Is positioned from the position shown by the solid line in FIG. 1 (the position shown in FIGS. 2 and 3) to the position shown by the chain double-dashed line in FIG. Therefore, the copy paper of the intermediate length passes through the upper surface of the rocking member 210 and then is guided to the lower surface of the rocking member 214 to receive the projection 146.
It is received in the upper end edge, that is, the receiving table 142. On the other hand, when a relatively short copy sheet is returned, the electromagnetic solenoid is not energized. Therefore, at this time, the copy sheet is received in the receiving table 142 by the action of the return roller pairs 206 and 216 through the upper surfaces of the swing members 210 and 214.

Next, the operation and effect of the copying machine provided with the above-mentioned copy paper return path 136 will be described.

When a paper jam occurs in the copy paper return path 103 or the copy paper retransmitting means 141, the operation lever 264 is operated to release the paper jam. Thus, the roller 262 of the first holding means 250 is separated from the plate member 266 of the first movable frame body 220, the first movable frame body 220 is rotated by its own weight in the direction indicated by the arrow 248, and When the first movable frame body 220 rotates by a predetermined amount or more, the second movable frame body 228 is integrated with the first movable frame body 220.
Is also rotated in the direction indicated by the arrow 248, and thus the first movable frame 220 is held in the open position shown in FIG. 3 (a part of the first movable frame 220 is held in the open position by contacting a blocking means (not shown)). The second movable frame 228 is a connecting member 244.
And is held in the position shown in FIG. That way,
As shown in FIG. 3, between the first movable frame 220 and the second movable frame 228, that is, a plurality of one-side elements of the return control mechanism 140 that defines the downstream side of the copy paper return path 130. The space between the plurality of other side elements is opened as required. Further, in the specific example, most of the plurality of one-side elements that define the upstream side portion of the copy paper return path 130 and the plurality of other-side elements are also opened as required. Therefore, when a paper jam occurs in the copy paper return path 130, most of the copy paper return path 130 is opened, so that the paper jammed in the copy paper return path 130 can be easily removed. Further, in the specific example, the following points are particularly noted. That is, a plurality of one-side elements of the return control mechanism 140 that defines one (upper side) of the downstream side of the copy paper return path 130 is moved upward with respect to the plurality of other-side elements. Therefore, even if the first movable frame 220 is moved to the open position, there is a space above the pedestal 142 of the copy sheet resending means 141, and therefore, when a paper jam occurs in the copy sheet resending means 141. The jammed paper can be easily removed through this space. Particularly, in the illustrated example, when the first movable frame body 220 is moved to the open position, the second movable frame body 228 is also moved upward accordingly, and therefore the first movable frame body is moved. By moving the body 220 to the open position, a sufficient space is secured between the second movable frame body 228 and the receiving table 142 of the copy sheet retransmitting means 141, and the paper jammed in the copy sheet retransmitting means 141 can be more easily handled. Can be removed. Further, when the operation lever 264 is operated in this way, the second holding means is passed through a gear train (not shown).
252 is biased to the inoperative position shown in FIG. In this way, the supporting member 268 is located substantially below the pedestal 142, and as can be understood from FIG. 3, it becomes even easier to remove the jammed paper in the copy paper resending means 141.

After removing the jammed paper as described above, the operation lever 264 is moved from the release position to the lock position. As a result, the roller 262 of the first holding means 250 becomes the first movable frame 220.
Acting on the plate member 266 of the first movable frame 220
It is turned in the direction opposite to the direction indicated by 248 (which causes the second movable frame body 228 to also turn). on the other hand,
When operating the operating lever 264, the gear train (not shown)
The support member 268 of the second holding means 252 is positioned in the working position shown in FIG. Therefore, when this operation is performed, the lower surface of the connecting plate 232 of the second movable frame body 228 moves to the second position.
By making contact with the roller 270 of the holding means 252, pivoting movement beyond the operating position shown in FIG. 2 is reliably prevented, and thus the second movable frame 228 is reliably held in the operating position. Also, in connection with the second movable frame 228 being held in the working position, the pivoting movement of the first movable frame 220 causes the return rollers 208, 212 and 216 and the return rollers 198, 202.
And 206 are pressed against each other, and thus the first movable frame 220 is securely held in the closed position by the biasing action of the biasing means 260.

In the specific example described above, one end of the first movable frame 220 and one end of the second movable frame 228 are connected via the connecting member 244, and the first movable frame 220 is oriented in the opening direction. The second movable frame 228 is also configured to be swung upward by the action of the connecting member 244 when swung by a predetermined amount, but instead of this, the second holding means 252 is used to make the second movable frame 228 swivel upward. Two
The movable frame body 228 can be swung. Referring to FIG. 4 showing a modified example (in FIG. 4, the same members as those in the concrete example shown in FIGS. 1 to 3 are designated by the same reference numerals). A connecting plate 232 ′ connecting a front wall (not shown) and a rear wall 230 of the movable frame 228 is provided with an action projection 302 protruding downward. And in connection with this, the second holding means
The 252 is mounted so that it is always located at the first position shown in FIG. 4 (therefore, in this modified example, the first movable frame 22).
The second holding means 252 along with the turning movement toward the closed position of 0
The gear train for moving the second movable frame body 228 and the connecting member for rotating the second movable frame body 228 in association with the swinging movement of the first movable frame body 220 toward the closed position can be omitted). The other structure of this modification is substantially the same as that of the specific example shown in FIGS.

In such a modified example, when the first movable frame 220 is swung upward as indicated by the arrow 248 in the same manner as described above, as will be understood from FIG. 4, the central axis of rotation of the first movable frame 220 (pin Since the member 226) is located above and away from the center axis of rotation of the second movable frame body 228 (pin member 234), the second movable frame body 228 is rotated with the rotation of the first movable frame body 220.
The operating protrusion 302 provided on the connecting plate 232 'of FIG. 2 rides on the roller 270 of the second holding means 252. And
When the first movable frame 220 is moved to the closed position partially shown by the chain double-dashed line in FIG. 4, as shown by the chain double-dashed line, the connecting plate 23
The 2'action protrusion 302 completely rides on the second holding means 252, whereby the second movable frame body 228 is moved slightly upward from the action position shown by the solid line, as in the above-described embodiment. Between the plurality of one-side elements and the plurality of other-side elements of the return control mechanism 140 are opened as required, and a sufficient space is created above the receiving table 142 of the copy sheet retransmitting means 141. In this way, the second holding means 252 for holding the second movable frame body 228 in the working position and the action projection 302 provided on the bottom of the second movable frame body 228 are the first movable When the frame body 220 is swung toward the open position, it constitutes an actuating means for swiveling the second movable frame body 228 from the working position. This action protrusion
In order to allow 302 to easily get on the roller 270 of the second holding means 252, it is preferable to incline the tip of the working protrusion 302 as shown in FIG. In addition, the action protrusion 302 acts to turn the second movable frame 228 upward,
The desired effect can be achieved without the action protrusion 302.

Although the specific examples of the electrostatic copying machine configured according to the present invention have been described above, the present invention is not limited to the specific examples, and various modifications and corrections can be made without departing from the scope of the present invention. Is.

For example, in the illustrated example, the first movable frame 22
0 is a structure that can be biased toward the open position by its own weight.However, a biasing means is separately provided, and the first movable frame 220 is biased toward the open position by the action of the biasing means. You can

Further, for example, in the illustrated specific example, the second movable frame body 228 is rotatably attached to the first movable frame body 220, but instead of this, the second movable frame body 228 is used. It may be mounted between the front substrate and the rear substrate 218 in a freely rotatable manner.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a specific example of an electrostatic copying machine constructed in accordance with the present invention. FIG. 2 is a sectional view showing a part of the copy sheet returning means of the electrostatic copying machine of FIG. 1 and its vicinity. FIG. 3 is a cross-sectional view corresponding to FIG. 2, showing a state in which the copy paper return path defined by the copy paper return means is opened. FIG. 4 is a sectional view showing a modified example of the copy sheet returning means and the vicinity thereof. 2 ... Housing 8 ... Rotating drum 48 ... Copy paper supply means 58 ... Copy paper transport path 130 ... Copy paper return path 136 ... Copy paper return means 138 ... Return mechanism 140 ... Return control mechanism 141 ... ... copy paper retransmitting means 220 ...... first movable frame 228 ...... second movable frame 250 ...... first holding means 252 ...... second holding means

Claims (4)

(57) [Claims] 1. A copy paper transport path, a copy paper supply means for supplying a sheet copy paper to the copy paper transport path, a copy paper return path, and a copy paper returned through the copy paper return path. And a copy paper retransmitting means for re-supplying the received copy paper to the copy paper transport path, wherein the copy paper supplied from the copy paper supply means to the copy paper transport path passes through the copy paper transport path. An image is formed on one side of the copy paper while being conveyed, and the copy paper having the image formed on one side is selectively introduced into the copy paper return path and passes through the copy paper return path. A mold of a type in which an image is formed on the other side of the copy paper while being returned to the re-transmitting means, then re-transmitted from the copy paper re-transmitting means to the copy paper conveying path, and being re-conveyed through the copy paper conveying path. In electro-copying machines; after returning the copy paper Is defined by copy paper returning means for feeding the copy paper introduced into the copy paper returning path to the copy paper retransmitting means, and the copy paper returning means includes a return mechanism and a return control mechanism, An upstream side of the copy paper return path is defined between a plurality of one-side elements and a plurality of other-side elements, and the copy is provided between the plurality of one-side elements and a plurality of other-side elements of the return control mechanism. A downstream side portion of the paper return path is defined, and further, the plurality of one-sided elements of the return control mechanism are mounted and movably arranged between a closed position and an open position for retracting upward. A first movable frame body configured to be biased toward an open position, and released to the closed position against the biasing force acting on the first movable frame body to the first movable frame body. An electrostatic copying machine, comprising: a first holding means for holding freely. 2. A copy paper conveyance path, copy paper supply means for supplying sheet copy paper to the copy paper conveyance path, copy paper return path, and copy paper returned through the copy paper return path. And a copy paper retransmitting means for re-supplying the received copy paper to the copy paper transport path, wherein the copy paper supplied from the copy paper supply means to the copy paper transport path passes through the copy paper transport path. An image is formed on one side of the copy paper while being conveyed, and the copy paper having the image formed on one side is selectively introduced into the copy paper return path and passes through the copy paper return path. A mold of a type in which an image is formed on the other side of the copy paper while being returned to the re-transmitting means, then re-transmitted from the copy paper re-transmitting means to the copy paper conveying path, and being re-conveyed through the copy paper conveying path. In electro-copying machines; after returning the copy paper Is defined by copy paper returning means for feeding the copy paper introduced into the copy paper returning path to the copy paper retransmitting means, and the copy paper returning means includes a return mechanism and a return control mechanism, An upstream side of the copy paper return path is defined between a plurality of one-side elements and a plurality of other-side elements, and the copy is provided between the plurality of one-side elements and a plurality of other-side elements of the return control mechanism. A downstream side portion of the paper return path is defined, and the plurality of one-sided elements of the return control mechanism are mounted to be movable between a closed position and an open position retracted upward. A first movable frame body, a second movable frame body that is rotatably disposed below the first movable frame body, and has the plurality of other side elements of the return control mechanism mounted thereon, and the first movable frame body. An actuating means for swiveling the second movable frame from the working position when the movable frame is swung toward the open position. An electrostatic copier characterized by the following. 3. The actuating means includes a connecting member having one end rotatably connected to the second movable frame body and provided with an elongated hole, and the length of the connecting member provided on the first movable frame body. The electrostatic copying machine according to claim 2, wherein the electrostatic copying machine is configured by a shaft member fitted into the hole. 4. The actuating means includes a second holding means for holding the second movable frame body in the working position, and an operating projection provided on a bottom portion of the second movable frame body. Composed by
When the first movable frame is swung from the closed position toward the open position, the acting protrusion rides on the second holding means,
The electrostatic copying machine according to claim 2, wherein the second movable frame is swung upward from the operating position.