JPS6315219B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a curl correction device for a paper feeder in a copying machine or the like using roll paper.

(Prior Art) In a copying machine that uses roll paper as copy paper, the roll paper is fed into the copy machine via a paper feeder, cut into a predetermined length, and copied. Because it can be stocked in rolls, the stock amount (equivalent amount of cut paper per roll compared to formats that use cut paper) is larger, and roll paper is larger than cut paper for the same size. The use of roll paper is preferred because of its low cost and ease of handling, especially for large-sized paper.

(Problem to be Solved by the Invention) Roll paper in which a long paper is tightly wound around a core material with a constant outer diameter has a strong curling tendency when the roll paper is unraveled due to being stored for a long period of time. (curling pattern), and this curling pattern becomes more pronounced as the thickness of the paper increases.

When the above-mentioned roll paper is automatically cut into a predetermined amount and fed into a copying machine, the curls make it difficult to transport, which not only causes paper jams but also causes copy errors. This may cause some inconvenience.

The causes of copy errors due to curling are as follows.

First, the configuration of this type of copying machine will be briefly explained based on FIG. 1, which is a schematic diagram.
A indicates the paper feeding section side, and B indicates the copying section side. In the figure, 1 is the roll paper, A1 is the first feeding mechanism consisting of the first feed roll 2 and the first pinch roll 3, and A2 is the first feeding mechanism. A second feeding mechanism consisting of a second feed roll 4 and a second pinch roll 5 is shown, and the rolled paper fed from the second feeding mechanism A2 is cut into a predetermined amount by a rotating cutter 6 and a fixed cutter 7. It is sent to the copying unit side B. 8 is a phenomenon device, 9 is a photoreceptor, 10 is a buffer, 11,
13 is a vacuum transport, 12 is a transfer corotron, 14 is a slip finger, 15 is a press roll, and 16 is a heat roll.

Now, if the paper 1a that has been cut and sent through the buttful 10 has a convex curl as shown in FIG. 2, the force of the curl will tend to overcome the electrostatic force of the photoreceptor and cause it to peel off. In particular, thick paper can easily peel off from the photoreceptor when vibration is applied to the paper.
Furthermore, it becomes extremely difficult for the trailing edge (terminus) to come into contact with the photoreceptor, resulting in a copying error in which the image is not transferred over a considerable width of the paper.

On the other hand, if the paper 1a has a concave curl as shown in Figure 3, the paper will not have the force to resist the electrostatic force of the photoreceptor, but on the contrary, the paper will work in a way that helps it conform to the curve of the photoreceptor. , the stripper finger 14 may come into contact with the photoreceptor too tightly and strongly hit the stripper finger 14 that is supposed to peel the paper from the photoreceptor, or parts arranged around the stripper finger 14, for example, as shown in FIG. There is a risk that the unfixed image will come into contact with parts 17 such as the lamp or pre-crane corotron and be damaged, and if it is forcibly peeled off against the force of this adhesion, the impact will cause damage to the paper. Toner equivalent to the image is scattered, causing copy defect (bleeding).

However, in the past, the above-mentioned troubles were considered to be unavoidable.

(Means for Solving the Problems) The present invention has been made in view of the above problems, and it is possible to improve the curling of the roll paper to be supplied without complicating the configuration of the device itself. An object of the present invention is to provide a curl correction device for a paper feeding device that can reliably correct paper curl according to the type of paper.

That is, the present invention is a curl correction device to be disposed in a paper feeding device using roll paper, which is configured to press paper fed under tension in a direction opposite to the curl. A pressing member is provided, and includes a variable mechanism for varying the relative position between the pressing member and the fed paper depending on the type of paper, and rotates depending on the type of paper of the roll paper. The variable mechanism described above is composed of a motor and a cam fixed to the drive shaft of the motor.

In such technical means, the pressing member may be selected as appropriate, but from the viewpoint of reducing the contact resistance with the roll paper,
It is preferable to use a roller-shaped one. The above-mentioned pressure roller includes a free rotation type or a forced rotation type.

Further, the paper type of the roll paper means a type that is distinguished by, for example, the thickness of the paper.

(Function) According to the above-mentioned technical means, when the roll paper is fed out one after another, the motor constituting the variable mechanism rotates by a predetermined angle depending on the type of paper in the roll paper. A cam fixed to the drive shaft of the motor variably sets the position of the pressing member depending on the type of roll paper. Therefore, the pressing member presses the roll paper with a pressing force that corresponds to the degree of curl of the roll paper, even if the curl of the roll paper differs due to the different types of paper.

(Example) An example of the present invention will be described based on the drawings.
In FIG. 1, the roll paper 1 is moved to the first feeding mechanism A.
It is set in a tensioned state between the cutter 1 and the second feed mechanism A2, and its tip is on standby in front of the cutters 6 and 7.

Now, the first and second feed rolls 2 and 4 are rotated by an external signal to start feeding paper, and when a predetermined amount of paper has been fed, both feed rolls 2 and 4 are stopped, and at the same time, the rotary cutter 6 starts rotating. The paper is then pressed against a fixed cutter 7 and cut into a predetermined length.

In the figure, C indicates the entire paper curl correction device, which is disposed between the first feeding mechanism A1 and the second feeding mechanism A2 on the paper feeding section side A, and has the following configuration.

That is, as shown in FIGS. 5 and 6, there is a pressing member 19 for pressing the roll paper 1 fed under tension in the direction opposite to the curl, that is, in the downward direction.
A pressing roller is used, and the shaft is fitted into a groove 21 formed in the side plate 20 via a bearing 19a, and its own weight presses the paper to correct the flatness.

In addition, if the pressing member is stationary, it may act as a large braking force (back tension) on the paper when paper curl correction is at its maximum, and the paper may not be conveyed smoothly, so the pressing roller is free. It is arranged as a rotating type or a forced rotating type.

A variable mechanism for varying the relative position between the pressing member and the paper depending on the type of paper such as paper thickness, that is,
In the embodiment, the mechanism for raising and lowering the pressure roller is constructed as follows.

The bearing 19a of the pressure roller is a plate cam 25
The plate cam 25 is supported by the side plate 2.
It is received by a guide 27 fixed at zero and is slidable laterally. A shaft 26 is fixed to both sides of the plate cam 25, into which a spring 24 is inserted, and the shaft 26 is received by two brackets 23 attached to the side plate 20. Further, one end of the shaft 26 is in contact with a shaft 22a of a motor 22 with a gear assembly (the shaft 22a moves in a straight line as the motor rotates, hereinafter abbreviated as the motor).

Here, when thick paper is set as the roll paper 1, the motor 22 is rotated by an external signal, and the plate cam 25 is slid to receive the bearing 19a at the point 25A of the plate cam 25, so that the paper path of the press roller is set. Correct curl by increasing the amount of fall. Further, when thin paper is set as roll paper, it is supported at point 25B of the plate cam 25 to reduce the amount of fall.

Note that the paper whose curling curl has been corrected as described above is fed out from the second feeding mechanism A2 as described above, and after being cut into a predetermined amount, it is transferred to the buffer 10.
It is transported to the main body side by Vacium Transport 11 via. The latent image inputted onto the photoreceptor 9 is made into a visible image by the developing device 8, and this visible image is transferred onto paper by the transfer corotron 12. The paper is peeled off from the photoreceptor 9 by a stripper finger 14, then conveyed by a vacuum transport 13, and the image is fixed under heat and pressure by a press roll 15 and a heat roll 16, thereby forming a desired image. You will get a copy of

(Effects of the Invention) According to the curl correction device in a paper feeder of the present invention, in a paper feeder using roll paper, the paper is fed in a tensioned state, and the paper is curled with a pressing member to counteract the curl. Since the paper is fed by pressing the paper in the same direction as to correct the curl, it is ideal for incorporating into a paper feeding device such as a copying machine where the paper is then cut into a predetermined amount and transferred to the copying section. This not only improves conveyance, but also prevents paper jams and eliminates the risk of copying errors as seen in conventional copying machines.

Furthermore, the present invention is provided with a variable mechanism for varying the relative positioning of the pressing member and the paper depending on the type of paper. It is possible to automatically perform controls such as reducing the amount of correction for thin paper with relatively little curl, and it is extremely effective as a curl correction device for paper feeding devices that use this type of roll paper. It is.

Furthermore, in this invention, the variable mechanism of the pressing member is composed of a motor that rotates depending on the type of paper in the roll and a cam fixed to the drive shaft of this motor. Since the configuration itself can be simplified, it is possible to effectively prevent the device configuration from becoming complicated, and also to prevent malfunctions from occurring.

[Brief explanation of the drawing]

The drawings show an embodiment of the curl correction device in a paper feeding device according to the present invention, and FIG. 1 is a layout diagram showing an example of the device being incorporated in a paper feeding device of an electrophotographic copying machine using roll paper, and FIGS. Fig. 4 is a side view of the main parts to explain the causes of copy mistakes that can occur in conventional copying machines, Fig. 5 is a perspective view of the paper curl correction device, and Fig. 6 is a sectional view of the main parts of the same. be. Description of symbols: A...Paper feed section side, B...Copy section side,
C... Curling correction device, A1... First feeding mechanism, A2... Second feeding mechanism, 1... Roll paper,
2, 4... Feed roll, 3, 5... Pinch roll, 6... Rotating cutter, 7... Fixed cutter, 19... Pressing member, 20... Side plate, 21...
Groove, 22...Motor with gear assembly, 22
a...Sliding shaft, 23...Bracket, 24...
...Spring, 25...Plate cam, 26...Shaft, 27...Guide.

Claims (1)

[Scope of Claims] 1. A curl correction device to be disposed in a paper feeding device using roll paper, for pressing paper fed under tension in a direction opposite to the curl. A pressing member is provided, and a variable mechanism is provided for varying the relative position between the pressing member and the fed paper depending on the type of paper, and rotates depending on the type of paper in the roll paper. A curl correction device for a sheet feeding device, characterized in that the variable mechanism is constituted by a motor and a cam fixed to a drive shaft of the motor. 2. A curl correction device in a sheet feeding device according to claim 1, wherein the pressing member is a pressing roller, and the pressing roller is configured to rotate.