JPH0185359U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a simplified cross-sectional view of a specific example of an electrostatic copying machine according to the present invention. FIG. 2 is an enlarged sectional view showing the selection roller means of the selection return mechanism in the electrostatic copying machine shown in FIG. FIG. 3 is a simplified explanatory diagram showing the relationship between the drive selection roller in the selection roller means and the returned copy paper. FIG. 4 is a simplified explanatory diagram showing the relationship between the selection guide means and the returned copy paper in a modified example of the selection return mechanism. 2...Housing, 8...Rotating drum, 40...
... Copy paper supply means, 50 ... Copy paper conveyance path, 9
6... Copy paper return route, 110 and 110'...
Selective return mechanism, 112...copy paper refeeding means, 14
0... Selection roller means, 142... Delivery roller means, 150... Drive selection roller, 152... Driven selection roller, 170 and 172... Guide plate.

Claims (1)

[Claims for Utility Model Registration] 1. An image is formed on one side of the copy paper while the copy paper is supplied from the copy paper supply means to the copy paper conveyance path and is conveyed through the copy paper conveyance route, and Copy paper with an image formed on one side is selectively introduced into a copy paper return path and received by a copy paper retransmission means through the copy paper return path, and then the copies received by the copy paper retransmission means In an electrostatic copying machine of the type in which paper is re-fed from the copy paper refeeding means to the copy paper transport path and an image is formed on the other side of the copy paper while being transported through the copy paper transport path; A selective return mechanism is disposed downstream of the copy paper return path, and the selective return mechanism does not act on relatively narrow copy paper but acts on relatively wide copy paper; When a relatively narrow copy sheet is returned through the path, it is received by the copy sheet refeeding means without being acted upon by the selective return mechanism, while a relatively wide sheet is returned through the copy sheet return path. An electrostatic copying machine characterized in that when copy paper is returned, the copy paper is guided downstream by the action of the selective return mechanism and then received by the copy paper refeeding means. 2. The scope of the utility model registration claim that the selective return mechanism is provided with a selection roller means that does not act on relatively narrow copy paper but acts on relatively wide copy paper to feed it downstream in the return direction. The electrostatic copying machine according to item 1. 3. The selection roller means includes a pair of drive selection rollers that are rotated in a predetermined direction and a driven selection roller that cooperates with each of the drive selection rollers, and the drive selection rollers are spaced apart. The driven selection rollers are mounted at intervals in the axial direction on a rotating shaft rotatably supported between the substrates, and each of the driven selection rollers is mounted on a free end of a support shaft supported on each of the substrates. When a relatively narrow copy paper is returned through the copy paper return path, the copy paper is received by the copy paper refeeding means without being nipped between the driving selection roller and the driven selection roller. On the other hand, when a relatively wide copy paper is returned through the copy paper return path, the copy paper is nipped between the driving selection roller and the driven selection roller, and is fed downstream. An electrostatic copying machine according to claim 2, which is accepted as a retransmission means. 4. The selection return mechanism further includes a delivery roller means disposed downstream of the selection roller means in the return direction, and when relatively narrow copy paper is returned through the copy paper return path. , the copy paper is received by the copy paper refeeding means directly from the downstream end of the copy paper return path without being acted upon by the selection roller means, while relatively wide copy paper is received through the copy paper return path. When the copy paper is returned, the copy paper is fed to the delivery roller means by the action of the selection roller means, and is received from the delivery roller means to the copy paper refeeding means. The electrostatic copying machine according to item 3. 5. The selective return mechanism is provided with selection guide means that does not act on relatively narrow copy paper but acts on relatively wide copy paper and guides it downstream in the return direction. The electrostatic copying machine according to item 1. 6. The selection guide means includes a pair of guide plates arranged at intervals and extending downstream in the return direction, and when relatively narrow copy paper is returned through the copy paper return path, This copy paper is received by the copy paper refeeding means without being guided by the pair of guide plates, and on the other hand, when a relatively wide copy paper is returned through the copy paper return path, this copy paper is not guided by the pair of guide plates. The electrostatic copying machine according to claim 5, wherein the electrostatic copying machine is received by the copy sheet refeeding means after being guided downstream by a guide plate. 7. The electrostatic device according to claim 6, wherein the selection guide means includes a feed roller for feeding the copy paper downstream in cooperation with each of the pair of guide plates. Copy machine.