JPH058278Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a paper feeding device for base paper in, for example, a rotary copying machine.

(Prior Art) Conventional rotary copying machines and the like are equipped with an automatic paper feeding device that sets a plurality of printing papers and takes out and transports the papers one by one.

In this type of automatic paper feeding device, a plurality of sheets stacked in a paper storage section such as a tray are taken out one by one by a feed roller that is in contact with the top surface of the paper, and the feed roller In a state in which the paper is buckled (so-called a state in which the paper is curved) by a guide member provided along and near the outer periphery of the rotating and feeding roller,
The sheet is transferred to a paper feed roller behind the feed roller.

(Problem to be solved by the invention) However, in such a paper feeding device, the amount of rotation of the feed roller for sequentially transporting the plurality of sheets by a certain amount (feeding amount) was constant. , the first sheet of a plurality of sheets that is first taken out from a storage unit such as a tray depending on the amount of rotation of the feed roller, and the leading edge of the second sheet of the plurality of sheets are the same as the first sheet. Paper handling (that is, friction occurs between the first sheet of paper and the second sheet of paper that is taken out, and this friction causes the leading edge of the second sheet of paper to be dragged by the first sheet of paper. ) and guided to the guide member, the starting position for taking out the second and subsequent sheets will be different depending on the amount of rotation of the feed roller. For this reason, the feed amount of the first sheet of paper transferred to the paper feed roller by the feed roller is different from that of the second and subsequent sheets, and furthermore, due to the amount of rotation of the feed roller and the guide member, the first sheet of paper is Not only will the amount of buckle (the degree of bending of the paper) differ between the paper and the second and subsequent sheets, but also the difference in the amount of buckle will cause the first sheet to be transferred to the paper feed roller of the device. the leading edge of the paper,
There was a problem in that there was a shift in conveyance between the leading edge of the second and subsequent sheets of paper, and it was therefore difficult to reliably convey the leading edge of the first sheet to the paper feed roller.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a paper feeding device that can maintain a constant amount of buckle on each of a plurality of sheets of paper, thereby increasing the reliability of transporting a plurality of sheets of paper. be.

(Means for Solving the Problems) In order to achieve the above object, the present invention takes out the first sheet of paper from a plurality of sheets of paper 8 and
1, the initial rotation amount of the feed roller 9 is set to be larger than the rotation amount of the feed roller 9 when the second and subsequent sheets of paper 8 are taken out and transferred, and the rotation of the feed roller 9 is increased. This is because the paper 8 is made to have a buckle due to the amount of paper 8 and the guide member 10 disposed along the outer periphery of the feed roller 9.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the accompanying drawings.

FIG. 1 is an overall configuration diagram of a paper feeding device according to the present invention.
FIG. 2 is an explanatory diagram of the state of the feed roller according to the present invention.

Reference numeral 1 denotes a rotary copying machine, and the rotary copying machine 1 includes a cylindrical plate cylinder 2 and a press roller 3 that presses a base paper (not shown) fitted onto the outer surface 2a of the plate cylinder 2.
A paper feeding device 4 is provided on the plate cylinder 2 for feeding printing paper through a pair of guide plates 17, 17.

The plate cylinder 2 is rotated by a belt pulley mechanism 6 provided between the drive wheel 5 of the rotary press 1 and the plate cylinder 2, and print paper is inserted between the plate cylinder 2 and the press roller 3. Perform ink transfer.

The paper feeding device 4 includes a plurality of printing papers 8 stacked in a storage section 7 such as a tray, a feed roller 9 that takes out and transports the printing papers 8 one by one, and a guide member 10 along the outer periphery of the roller 9. , a paper feed roller 11 that feeds the printing paper 8 taken out and transferred by the feed roller 9 to the plate cylinder 2, and a set of guides that guide the printing paper 8 from the feed roller 9 to the paper feed roller 11. With the plates 12, 12 provided, the device 4
The plurality of printing papers 8 are taken out one by one by the feed roller 9, which will be described later.
The printing paper 8a taken out by the rotation amount and the guide member 10 is conveyed to the paper feed roller 11 with a buckle (a so-called curved portion of the printing paper) shown in FIG. 1R.

Next, the amount of rotation of the feed roller 9 mentioned above will be specifically explained.

The feed roller 9 sets the initial rotation amount of the feed roller 9 when taking out the first sheet of the plurality of sheets 8 from the storage section such as the tray 7 during continuous operation of the roller 9 to the second sheet of the sheets 8. The rotation amount is set to be greater than the predetermined amount of rotation of the feed roller 9 when taking out subsequent sheets from the tray 7. That is, the initial rotation amount is determined by one rotation of the feed roller 9 shown in FIG. Take out the first sheet of paper from tray 7 and press the paper feed roller 1.
1, the feed roller 9 and the guide member 1
0 creates a buckle on the first sheet of paper (dashed line in Figure 2).
R ₁ ), and further increase the amount of rotation from the one rotation to the position of the guide member 10 (see FIG. 2 B) (see arrow C in FIG. 2) to hold the first sheet of paper. Increase the amount of buckles (see broken line _R2 in Figure 2).

The paper feeding device 4 having the above configuration allows the feed roller 9 of the device 4 to feed the first sheet of the plurality of printing sheets 8 by the initial rotation amount of the feed roller 9 that is greater than the predetermined rotation amount of the roller 9. While taking out the paper, the second and subsequent papers are separated into the first paper by the rotation of the feed roller 9 and the guide member 10, and the position of the guide member 10 (see FIG. 2B). ), it is possible to provide a constant amount of paper feed that is the same as the amount of paper fed to the paper feed roller 11 starting from the paper feed roller 11 of the device 4, thereby ensuring that the first sheet of paper is transferred to the paper feed roller 11 of the device 4. You can increase your sexuality. As a result, the amount of buckling that the first sheet of the plurality of printing sheets 8 has, and the leading edge of the second sheet of the plurality of sheets 8 are separated by the first sheet and reach the guide member 10. In the guided state, by the predetermined amount of rotation of the feed roller 9 and the guide member 10, it is possible to make the amount of buckle on the second and subsequent sheets constant, and therefore the feeding of the device 4 is made constant. Since it is possible to easily prevent misalignment between the leading edge of the first printing paper 8 transferred to the paper roller 11 and the second or more printing paper 8, the leading edges of the plurality of printing papers 8 can be easily prevented. Paper feed roller 1
It is possible to increase the reliability of rapid transfer to No. 1.

In the embodiments described above, the paper feeder according to the present invention was used for supplying paper to a rotary copying machine, but it can also be used as a paper feeder for supplying predetermined paper in various other applications.

(Effects of the invention) As is clear from the above explanation, according to the invention,
It is possible to make the amount of buckle on each of a plurality of sheets of paper constant, which has the effect of increasing the reliability of transporting a plurality of sheets of paper.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a paper feeding device according to the present invention.
FIG. 2 is an explanatory diagram of the state of the feed roller according to the present invention. In addition, in the drawing, 8 is printing paper, 9 is a feed roller, 1
1 is a paper feed roller.

Claims (1)

[Scope of utility model registration request] In a paper feeding device, in which a plurality of sheets of paper stacked in a paper storage section are taken out one by one by a feed roller in contact with the top surface of the paper and transferred to a paper feed roller, one sheet of the plurality of sheets is The initial rotation amount of the feed roller when the first sheet of paper is taken out and transferred to the paper feed roller is made to be larger than the rotation amount of the feed roller when the second and subsequent sheets of the paper are taken out and transferred. A paper feeding device characterized in that the paper is buckled by the amount of rotation of the feed roller and a guide member disposed along the outer periphery of the feed roller.