JPS5847733A - Sheet feeder of copying machine - Google Patents

Abstract

PURPOSE:To enable to surely feed out sheets of paper with various sizes by a structure wherein sheet feed rollers located conformably to the minimum paper size and a pair of paddles, which are located near separating pawls and serve to control and push out the curved part of a sheet of paper, is provided. CONSTITUTION:A pair of the sheet feed rollers 3 located conformably to the paper with the minimum size 2 is mounted onto a roll shaft 1 and the separating pawls 4 and 4 are located to the shaft 1. At least one pair of paddles 5 consisting of a plurality of radially formed vane portions 7 is installed on the roll shaft 1 at both sides of the sheet feed rollers 3 and serves to control the curved part 8 of the paper with larger size 2' as well as to push out the curved part 8 by means of the elastic deformation of their vane portions 7. The controlling and pushing-out functions of the paddles 5 are effective to a sheet of thicker paper. Furthermore, even if a cassette or the like comes just below the paddles 5, the paddles 5 can manage various sizes of paper with no trouble, because the vane portions 7 elastically stand back.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device for a copying machine, and particularly to a corner and snapper type paper feeding device.

It is known that the positional relationship between the separation claws and the feed roll is important in order to stabilize performance in paper feeding devices that have a pair of separation claws on both ends of the paper feed side (corner snapper type). There are.

However, as the paper size increases, it becomes difficult to arrange the optimum position KO-rule for all paper sizes, and the following methods have been devised as an alternative.

(1) As shown in Fig. 1, the feed lever 1 can be moved in the axial direction of the roll shaft by 5 Kt, and the feed lever P is moved to the optimum position according to the paper size.

(2) As shown in FIG. 2, a method in which a plurality of rolls a are arranged on a roll axis cVc to correspond to the paper size.

(3) As shown in Figures 3 and 4, the roll e is arranged according to the minimum paper size, and the trunk material f is arranged outside the roll e to restrict the curvature of the paper (4) m5 As shown in FIGS. 3 and 6, the member f for regulating the curvature of the paper shown in FIGS. 3 and 4 is rolled gl'c.

However, regarding (1), although the performance is stable, the mechanism has multiple MEs, resulting in high cost.

(2) Regarding K, there was a drawback that it could not cope with the increase in paper sizes as they became smaller.

(3) and (4) With respect to K, there is a drawback that when paper is stiff, the member f that restricts the curvature becomes a load and obstructs the feeding of the paper.

The present invention has been made in view of the above circumstances, and its purpose is to provide a paper feed device for a copying machine that has a simple mechanism and is capable of reliably feeding sheets of various sizes. There is a particular thing.

Hereinafter, the present invention will be explained with reference to FIG. 7 and subsequent figures.

In the drawing, reference numeral 1 denotes a roll shaft, and a pair of feed rolls 3 corresponding to the smallest size paper 2 are attached to the roll shaft IK.

In the drawing, numeral 4 indicates a pair of separation claws.

The roll shaft IK is located on both sides of the feed roll 30, and the paddles 5 are attached thereto.

These paddles 5 have a plurality of blades 7 formed radially around the outer periphery of a boss 6 that is fitted onto the roll shaft 1, and the blades 7 are elastically variable.

These paddles 5 function to regulate the curved portion g of the large size paper 2' and to push out the curved portion 8.

When the diameter of the blade part 7 of the paddle 5 is smaller than the diameter of the feed roll 3, the blade part 7 comes into contact with the initial raised portion 8' of the curved part 8 of the paper 2', as shown in FIG.
If the diameter of the blade part 7 is larger than the diameter of the feed roll 3, the blade part 7 comes into contact with the front part of the curved part 80 and pushes out the curved part 8, as shown in FIG. It acts on.

The paddle 5 controls the curved section 8 of the paper 2' at the same time.
Because it has the force to push out paper, it functions similarly to cardboard.

Further, since the blade portion 7 of the paddle 50 escapes, even if a cassette or the like is placed under the paddle 5i1, it is possible to handle various sizes of paper without any problem.

Since the present invention has been described in detail above, the paddle 5 functions to restrict the curved portion 8 of the paper and at the same time push out the curved portion 6, so that paper of various sizes can be reliably fed out. The mechanism is simple and costs can be reduced.

[Brief explanation of the drawing]

Figures 1, 2, and 3 are respectively plan views of the paper feed device of a conventional copying machine, Figure 4 is a view taken from the arrow direction in Figure 3, and Figure 5 is a diagram of another conventional copying machine. 6 is a front view of the paper feeding device, FIG. 7 is a plan view of an embodiment of the present invention, FIG. 8 is a front view of the same, FIG. 9 is a perspective view of the same, FIGS. FIG. 11 is an explanatory diagram of the functions of the paddles. 3 is a feed roll, 4 is a separation claw, 5) is), and 8 is a curved part. Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 7 Figure 8

Claims (1)

[Claims] A pair of separating claws 4 arranged at both ends of the paper sending side, and a feeding wheel 3 arranged at a position matching the smallest size paper.
and at least a pair of paddles 5 which are arranged near the separating claw 4 and which regulate the curved portion 8 of the paper and push out the curved portion 8.