JPS6031464A - Curl correcting apparatus for business sheet - Google Patents

Abstract

PURPOSE:To properly correct curl according to the thickness of a business sheet by providing a business-sheet thickness detecting means and adjusting the curl correction amount by a curl correcting means. CONSTITUTION:On the business sheet 1 onto which toner 2 is applied passes through a developing process in a copying machine, and the fixation of toner is carried-out in a fixing apparatus constituted of a heating roller 4 and a pressing roller 5, and curl is generated because of the difference of water content on each face of the business sheet 1. A curl correcting apparatus 6 is installed on the downstram side of the fixing apparatus in order to correct the curl, and correction for curl is carried-out according to the degree of intrusion of the curl correcting roller 10 into a curl correcting belt 9. In this case, the amount of intrusion of the roller 10 is controlled by turning a link 11 around the shaft of a trailing gear 12 by a motor 14 through a driving gear 13 and the trailing gear 12, and the motor 14 is controlled by a controller 15 according to the output of a paper-sheet thickness detecting apparatus 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a paper roll correction device in an electrophotographic copying machine or a facsimile machine, which also serves as a paper presentation and conveyance line.

PRIOR TECHNOLOGY Conventional paper edge correction devices in copying machines, etc. have fixed the amount of correction regardless of the thickness of the paper, so they have little correction effect on thin paper, and on thick paper. However, it had drawbacks such as wrinkles.

In addition, there are some knife drawing devices that allow adjustment of the amount of correction, but the operator must check the thickness of the paper and adjust the amount of correction. Therefore, the operation work for the operator increases, which is inconvenient.

OBJECTS OF THE INVENTION The present invention relates to the invention of a curl correction device for copying machines, etc., which eliminates the above-mentioned drawbacks, and the object thereof is to automatically correct curl correction by providing a paper thickness detection means 7. The purpose of this invention is to provide a copying machine, etc., which can adjust the amount of correction.

Composition of the invention The structure of the present invention will be explained based on FIG.

A is a paper thickness detection means for detecting the thickness l of paper, and B
C is a curl correction amount adjustment means that adjusts the correction amount of the blade based on the information from the detection means, and C is a curl correction amount adjustment means that corrects the curl based on the correction amount set by the adjustment means. This is a correction means.

According to the present invention, the amount of curl correction can be automatically adjusted according to the thickness of the paper using the σ] configured as described above.

Embodiment Below, an embodiment of the present invention applied to a copying machine will be described with reference to FIGS. 2 and 3.

FIG. 2 is a schematic explanatory diagram of an embodiment in which a blade correction device according to the present invention is provided after the fixing process in a copying machine.

() In the same figure, 'fi153=' is a paper that has undergone a developing process and has Yaner Z attached to its surface.

The same 111 al is transferred to the heating roll 4 by the conveyor belt 3.
The toner is conveyed to a fixing device consisting of a pressure roll 5 and a pressure roll 5 facing the paper, and is sandwiched between both rolls.

At this time, moisture existing on the surface side of the paper to which the soot has adhered is removed by the heat of the heating roll 4, the paper fibers shrink, and the paper curls on the back side J side Z outside.

The next curl correction device 6 corrects the curl of this paper.

In the same curl correction device 6, the correction of the blade is carried out with the curl correction bell) 9 which is suspended between the pulleys 7 and 8.
This is done by a curl correction roll 10 that presses the curl correction device 10 in a curved shape, and the amount of correction Z is adjusted depending on the degree of penetration of the curl correction device 10 into the curl correction bell 9.

The curl correction roll 10ci is fixed to one end of a link 11 which rotates in unison with the driven gear 12, and by rotating around the axis of the driven gear 12,
It is possible to adjust the amount of penetration into the blade correction belt 9.

The driven gear 12 meshes with a drive gear 13 that is rotated by the drive of a motor 14.

The motor 14 is driven by the drive control device 1 based on a detection signal from a paper thickness detection device 16 that detects the thickness of the paper.
Controlled by 5.

Paper thickness detection device 6 calculates the thickness of a bundle of several dozen sheets by dividing it by the number of sheets.
This shows the paper thickness and the corresponding paper weight.

For example, on a tray that stores paper,
As the paper is fed, the position of the top layer paper decreases, but for a certain amount of decrease, [Number of sheets of paper fed (n'l (the thickness and weight of the paper by holding it) TiT= −
(K is a constant).

Based on this detected value, the drive control device (5) controls the lack of driving of the motor 14.

Since the present embodiment is configured as described above, when the thickness of the paper is detected by the paper thickness detection device 16 at the stage when the paper is fed from the tray, the motor t4Y is driven according to the detected value. , adjust the amount i (if amount) of the curl correction roll 10 into the curl correction belt 9, and perform correction 1 and correction 2.

In general, thin paper is better than thick paper because the curl of the sword is better.
, it is necessary to increase the amount of penetration of the curl correction roll IO into the curl correction roll 9.

Also, for thick paper, the amount of indentation Z of the roll correction roll
If it is increased, wrinkles will occur, so it is not possible to increase the amount of penetration beyond a certain point.

Based on the above-mentioned properties of the paper, the amount of curl of the paper that has undergone correction 2 relative to the amount of penetration of the correction roll is shown in FIG. 3 as a graph.

Here, the amount of bite is the distance from the belt position t when the correction roll is not in sliding contact with the curl correction bell b to the deepest position when the correction roll bites and the belt becomes curved. This means the amount of correction.

Weight is also expressed as the height from the flat surface to the edge of the paper when the edge of the curled paper is placed on a flat surface with the outside facing back and the paper is balanced. It is assumed that

In FIG. 3, the curve 2 indicates the case of thin paper, and the curve 2 indicates the case of thick paper.

Similarly, regarding the amount of intrusion, thin paper has a larger amount of curl after correction than thick paper, indicating that it is difficult to correct.

The broken line indicates the upper limit level at which stable paper feeding can be expected, and a sword weight below the same level is acceptable.

In the case of the thin paper shown here, if there is no penetration depth of approximately 5 or more, it will not be possible to obtain a sword weight below the upper limit level, and there is a possibility that practical problems will occur. An amount of penetration of about 1 mm is enough to fall below the upper limit level 1, and if the amount of penetration is too large, wrinkles will occur.

The amount of penetration that causes wrinkles in this cardboard is 4.
At a temperature slightly exceeding mrn, it is located at the position indicated by the dashed line in rJ1 Fig. 3.

Conventionally, in the case of a copying machine in which the amount of correction is not adjusted, the amount of penetration (σ) has sometimes been too large to cause wrinkles to occur in cardboard, and the amount of curl caused by pressure release.

Conventionally, when the amount of penetration is increased, wrinkles occur on thick paper, and when it is decreased, correction is not performed satisfactorily on thin paper.

In this embodiment, since the insertion amount can be automatically adjusted according to the thickness of the paper, this conventional problem Z can be solved.

In the above embodiments, in the case of single-sided copying, Z is assumed to be L, but in the case of double-sided copying, it is especially necessary to correct curl.

If the amount of paper curl is large at the stage where one side of the paper has been copied and fixed, and the other side is being copied,
This is because paper jams can cause copy errors.

Effects of the Invention As described above, in the present invention E, since the amount of correction can be appropriately set according to the thickness of the paper, the correction amount of the paper can be set below a certain value regardless of the thickness of the paper. This enables stable paper conveyance.

[Brief explanation of drawings]

FIG. 1 is a diagram corresponding to claims, FIG. 2 is a schematic explanatory diagram of an embodiment according to the present invention, and FIG. 3 is a diagram showing the relationship 7 between the amount of curling and the amount of curl after correction. 1...Paper, 2...Fner, 3...Transport belt,
4...K710-l, 5...7JDIEO-/l'
, 6. Curl correction device, 7.8... Gooley, 9...
Sword correction belt, 10・Parameter correction roll, 11・
... Link, 12 ... Driven gear, 13 ... Drive gear, 14 ... Motor, 15 ... Drive control device, 16.
...#1 Paper thickness detection device. Agent: Patent attorney Nozomi Ehara (1 person) Figure 1

Claims (1)

[Claims] In the paper processing device, 1) a paper thickness detection means for detecting the thickness l of the paper, a curl correction amount adjustment means for adjusting the curl correction amount of the paper based on information from the detection means, and setting by the adjustment means; Correction of sword rule 2 based on the correction amount
11.
1. Curl correction device for paper processing equipment.