JPS5953335A - Sheet feed device of copying machine - Google Patents

Abstract

PURPOSE:To have good performance of prevention of double sheet feeding always in the same condition regardless of the format and quantity of the sheets used, by such a construction that the distance of feed vane from the double feed preventive pad is maintained constant at all times. CONSTITUTION:When a copying machine is put in service, a motor begins driving a feed vane driving shaft 2, to rotate the feed vane 1 clockwise. Thereby the uppermost one of the sheets 9 is sent forwared by the feed vane 1. When one of the elements of this feed vane 1 comes in contact with a double feed preventive pad 7, the sheets 9 are sent forward one after another while being pressed to this pad 7 by the feed vane 1. If now the feed vane 1 has sent off two sheets 9 simultaneously toward the pad 7, the two sheets are pressed to the pad 7 overlapped one over the other, but because the frictional coefficient of the pad 7 with the sheet is larger than that of the sheets between, the lower sheet will remain on the pad 7 while the upper one is sent off by the feed vane 1. At this time, the distance of the pad 7 from the feed vane driving shaft 2 is maintained constant always, so that performance of double feed prevention can be obtained in the identical condition at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copy paper feeding device that prevents double feeding of copy paper.

Conventional devices of this type have used the following method. The feed roll of the paper feeder and the pad for preventing double feeding are fixed to prevent them from moving. When copy paper is set in the paper feeder, the copy paper is pushed up from below by a spring or the like and pressed against the feed roll.

Copy paper 1'i is fed out in this state by rotating one call. Copy paper (J passes over a double-feed prevention pad).

The pad (to prevent double feeding) is made of a material that causes the frictional force between the copying paper and the pad to be greater than the frictional force between the copying paper and the pad.

If two sheets of copy paper are sent out from the feed roll at the same time, the upper copy paper is fed 1 and the lower paper is sent out by the let pad.

However, in such a slave 11Q device, the copy paper is pushed from below by a spring, so if the weight of the paper fluctuates greatly, the paper cannot be pressed against the feed roll with an appropriate force. becomes difficult fj6. Generally speaking, it is well known that when the size of paper changes, the IBH section also changes greatly. For example, if paper with a small size is sent and the air volume of the paper decreases, the monthly paper will be strongly pressed against the feed roll and double feeding will occur more frequently. −
If you load thick T-size paper, the paper will become weaker and the pressure force of the feed roll against the paper will be weaker, causing a low-life feeding noise.

As mentioned above, the conventional device tt has the disadvantage that paper feeding becomes unstable depending on the size of the paper to be set. Also, as copying progresses, the number of sheets of paper decreases.
There was also the disadvantage that the force of the spring that held the paper gradually increased as the paper was removed, making double feeding more likely.

The purpose of this invention is to eliminate the drawbacks of the prior art described above,
To provide a paper feeding device for a copying machine which can always stably feed paper under the same conditions even if the size of the set paper changes or the number of sheets decreases as copying progresses.

The present invention is characterized by: a positioning roll rotatably mounted on the morning feed drive shaft for always positioning the morning drive shaft at a constant height with respect to the top sheet of paper;
It is equipped with a feed blade provided on the feed cylinder drive shaft, and a double feed prevention upper pad provided in an area shorter than the arm length of the feed blade (7. The feed blade and the double feed prevention pad are is the above position 17
=7 The roll moves up and down as a unit in response to the up and down movement of the deciding roll.

The present invention will be explained below by way of examples. FIG. 1 shows a perspective view of an embodiment of the invention.

Feed blade 1 let feed; p' + qg is fixed to moving shaft 2.

Feed blade 'fill'! *2 is equipped with a positioning roll 4 via a bearing 3. Therefore, the position determining roll 4 makes one rotation of the drive shaft 2;)a)ζ) without resistance. This implementation i≦(: is, positioning 1
1. There are two rows on both sides of the feed feather 1. 1n Rihabe @ lll112 is body + J qil
The drive shaft support 5 is rotatably supported by the shaft f1, and one side of the drive shaft support 5 is supported by the rotation axis J, ? on the β shaft 6. 11"C.Small moving shaft support 50) At the hydraulic end t', there is il'U on a part of its surface.
If the pad support 8 attached to the anti-feeding pad 7+)s is firmly attached, the moving shaft 2 is moved by a motor with a length of 411 m as shown in the figure.
:Transmit +1 + force and rotate.

This type of double feed prevention function is applied to the square V-shaped paper feed device.
When the paper 9 is set, the drive shaft support 5 and the pad support 8, each having a one-piece structure, and the drive shaft support 1. ′? The feed vane movable shaft 2 cap supported by the body 5 falls onto the paper 9 due to its own weight. At this time, the positioning roll 4 hits the upper surface of the paper 9, and the feed blade part moving shaft 2. The drive shaft support 5 and pad support 8 retain their shape. For this reason, the height of the feed morning drive shaft 2 relative to the top sheet of paper is approximately 1? depending on the radius of the positioning roll 4. ? ,
[Determination 4], the distance between the top sheet of paper to be sent out and the morning drive shaft 2 is constant regardless of the size and number of sheets.

Therefore, the pressure applied to the paper by the feed blade 1 is always constant. Further, the positional relationship between the top sheet of paper to be sent out I' and the line-feed prevention pad 7 is also constant regardless of the size of the sheet or the position of the sheet.

Send feather 1, arm length 2! As not shown in the 21st schematic diagram, R is longer than the distance () between the morning feed drive shaft 2 and the double-feed prevention pad 7, and has a length γ of 1. Therefore, when one of the feathers of the feed blade 1 hits the pad 7 for preventing electric transmission, it bends as shown in part 11 and rotates while pressing the pad 7 for preventing double feeding.

Next, the operation of the full length embodiment will be explained. As shown in FIG.
When the paper 9 is placed directly on top of the paper 9, the paper setting is completed.

When the copying machine starts operating, a motor (not shown) appropriately moves the drive shaft 2 in the direction j', and the feed blade l rotates in the direction J'7J.

By kneading, paper 90]-moon θ month j on cloth, feed feather 1
When the single force of the feeder blade 1 hits the double-feed μJ market output pad, the paper is pressed against the paper 1 and 7 by the feeder blade 1 and advances toward the feeder. .

In this way, the paper is fed out one by one.By the way, as shown in FIG.
If 2 sheets of paper are sent out at the same time in the direction of the double-feed prevention pad 7, the two sheets will be 11 times heavier than the feed blade 1! lj Pressure liquid is applied to pad 7 for preventing lj feeding +l
'R feed 1F, J eye pad 7 is made of foamed urethane etc. 4
When pressed with the same force, the pad -
The friction between the sheets is greater than the wf friction between the sheets.

Therefore, the lower paper remains on the pad 7, and only the upper paper is sent first by the feed feather l. This table, the distance between the feed morning drive shaft 2 and the double-feed prevention pad 7 is related to the feed rate of the paper being fed and remains constant.
You can make them do the work.

As described above, according to the present invention, the distance between the feed morning drive shaft 2 and the top surface of the paper is set, and the size of the paper,
The radius of the positioning roll is fixed regardless of the spear, so the feed blade is 14t? The pressing force applied to the upper paper is always constant, and it is possible to feed the paper by adding it to the left.

In addition, since the distance between the feed blade and the double feed prevention pad is always constant, the +111 operation of the claw feed prevention IF can be performed with the same condition r4: no matter how the paper size or acid changes. can. Therefore, in the event that double feeding occurs due to poor paper handling, etc., only the second paper will be fed (i. The bottom paper remains in the pad to prevent electrical transmission), thereby preventing double feeding. It is possible to go up - C kiru 1,

[Brief explanation of drawings]

FIG. 1 shows an example of an embodiment of the present invention.
A schematic diagram to explain the 1st and 9th months of the 1st Neri feather and 1r delivery city pad. It is a schematic diagram. 1...Feeding blade, 2...1＼Riving blade (4・λ force axis, :U・Bearing, 41st position 1 steaming roll, 5-!, j
A<Efficacy 1; 1 branch 1. Integral, 6. Fixed shaft, 7. Double feeding prevention pad, 8. Pad support, 9. Paper agent Michi Hiraki, patent attorney, 1 non-person.

Claims (1)

[Claims] (1) A drive shaft support whose one end is rotatably held on a shaft, a pad support fixed to the other end of the 1% drive shaft support, and a drive shaft support that is attached to the pad support. (1) Pad for preventing double feeding; (11) Rotatably held in the center of the K drive shaft support;
11 fixed to l1jll, and continuous feeding I) 4'27 (4'27) (4'27) rotatably attached to the wing part driving shaft, and a positioning roll is also provided, and the positioning roll is placed on the paper. , the paper is fed by rotating the feed blade. Front 11[;Okuriba,
A paper feeding device for a copying machine according to a patent, characterized in that the distance between the ringing shaft and the 1F feed prevention pad is longer than the distance between the ringing shaft and the 1F feeding prevention pad.