JP2517960B2 - Paper transport device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device, and more particularly to a sheet conveying device applied to a copying machine and an online sheet folding device.

“Conventional technology” Conventionally, for copying machines that can continuously make large copies,
When the paper folding device is connected online, the paper conveyance speed of the paper folding part of the paper folding device is set to a speed slightly higher than the copying speed of the copying machine by design. The factor is
In a copying machine for continuous copying, the paper interval is usually narrowed in order to increase the number of copies per unit time. However, when the paper interval is narrowed, the control time of the mechanism in the paper folding unit of the paper folding device is shortened. Becomes difficult, and also
This is because the occurrence of a slight slip of the paper in the paper folding portion causes a collision between the papers.

[Problems to be Solved by the Invention] However, in the above-described sheet conveying apparatus, when the conveying speed of the sheet folding section is increased, the distance between the transfer section of the drum of the copying machine and the sheet folding apparatus is different from that of the sheet folding apparatus. It must be longer than the maximum folding length.If this length is not set, the paper will be pulled while the image is being transferred on the copier.
The image will be distorted. Therefore, for example, in order to fold a long copy of about 3 m online, there is a problem that a long conveyance path must be provided between the copying machine and the paper folding device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a paper transporting device capable of folding a long copy without requiring a long transporting path between the copying machine and the paper folding device as described above.

"Means for Solving the Problems" The sheet transporting device of the present invention, in order to achieve the above object,
The folding section feed roller for feeding the sheet immediately before the sheet folding section is stopped for a predetermined time to form a paper loop, and the folding operation of the paper is started after the predetermined amount of the paper loop is formed.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of a sheet conveying device showing an embodiment of the present invention. The image formed on the drum 2 in the copying machine 1 is
After being transferred onto the sheet 4 at the transfer position 3, the sheet is conveyed by the sheet conveying section 5 and fixed by the fixing device 6. The sheet 4 after fixing is conveyed by the conveying roller pair 7 and the conveying path 8 to the sheet guide plate 12 just before the sheet folding section 11 in the sheet folding device 9. The sheet 4 is alternately fed to the two pairs of folding rollers 15 and 16 by the folding section feed roller 13 and the direction switching member 14 in the sheet folding section 11 to be folded.

Now, the paper conveyance distance from the transfer position 3 on the drum 2 to the folding part feed roller 13 of the paper folding part 11 is x mm, the copying speed of the copying machine 1 and the conveyance speed to the folding part feed roller 13 are Amm / sec, the paper The conveyance speed of the folding section 11 is Bmm / sec, and the length of the sheet 4 is ymm. In this case, B> A.

The problem to be solved in the present embodiment is when y> x, and when y <x, the copy image is affected even if the folding feed roller 13 is not stopped for a predetermined time to form a paper loop. Do not bring. (Actually, the fixing device 6
When there is the sheet 4 underneath, pulling the sheet 4 affects the fixing property, but it will not be considered here. ) When y> x, for example, after the folding portion feed roller 13 is stopped only during the following equation (y−x) / Asec (1), a paper loop is formed in the space 17 of the paper guide plate 12. When the folding of the paper is started, the trailing edge of the paper 4 has passed below the drum 2, so that the transferred image is not affected. But (1)
If the feed roller 13 for the folding section is stopped for the time indicated by the formula, the sheet of [(y−x) / A] × A = (y−x) (2) will be accumulated in the 17th loop space. It is difficult to accommodate the paper loop in the space 17 when folding a long copy.

Therefore, when a paper loop is created in the space 17, the amount of paper loop accumulated in the space 17 is as follows when the time for stopping the folding feed roller 13 is Csec.

Amm / sec × Csec = A × Cmm When the folding part feed roller 13 is activated here, the paper loop decreases at (BA) mm / sec, so stop the folding part feed roller 13 for Csec. The time that the created paper loop disappears is A × C / (BA) sec.

If the trailing edge of the sheet 4 has passed the drum 2 when this time has elapsed, the copy image is not affected.
The time required for the paper 4 to pass through the drum 2 is (y−
x) / Asec. Therefore, the folding part feed roller is provided by the value of C such that the following expression (y−x) / A ≦ C + A × C / (B−A) (3) holds.
If 13 is stopped, paper 4
You can fold the paper. (Actually, the folding part feed roller
Expect extra downtime at 13. ) When the copying machine 1 makes a copy, the length information of the copy sheet 4 is sent to the sheet folding section 11 so that the sheet folding section
If the paper loop amount is calculated by the microcomputer of the paper folding device 9 of 11, it becomes possible to fold the paper 4 by forming a paper loop according to the copy length of the copying machine 1.

[Advantages of the Invention] As described above, according to the present invention, the fold portion feed roller for folding the paper immediately before the paper folding portion is stopped for a predetermined time to form a paper loop, and a predetermined amount of the paper loop is formed. By controlling so that the folding action of the paper is started after the formation,
In addition, it is possible to continuously convey the paper from the copying machine to the paper folding device without disturbing the copy image.

[Brief description of drawings]

FIG. 1 is a plan view of a sheet conveying device showing an embodiment of the present invention. 1 ... Copying machine, 2 ... Drum, 3 ... Transfer position, 7 ... Conveying roller pair, 8 ... Conveying path, 9 ... Paper folding device, 11 ... Paper folding section, 12 ... Paper guide plate , 13 …… Folding part feed roller, 17 …… Space part.

Claims (2)

(57) [Claims] 1. A sheet on which an image is transferred at an image transfer position of a copying machine is conveyed to a folding section feed roller in a sheet folding apparatus,
In a paper folding apparatus that conveys a sheet to a pair of folding rollers by the folding section feed roller and folds the sheet, a feed speed B of the folding section feed roller of the paper folding apparatus is set higher than a sheet conveyance speed A of the copying machine, and the sheet is fed. In accordance with the length information of the folding section feed roller, the start timing of the sheet feeding of the folding section feed roller is controlled to the copying machine side of the folding section feed roller.
A sheet conveying device, wherein a required amount of sheet loops calculated in advance is formed. 2. When the distance between the transfer position and the folding feed roller is x, the paper length is y, and the folding feed roll stop time for forming a paper loop is C, the value of C is The paper feed according to claim 1, wherein the folding part feed roll is stopped within a time within a range satisfying the following expression (y−x) / A ≦ C + A · C / (B−A). apparatus.