JPS6242821B2 - - 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. This curling pattern increases as the remaining amount of the roll paper wound around the core material decreases, that is, as the winding diameter decreases.

When the above-mentioned roll paper is automatically cut into a predetermined amount and fed into a copying machine, the curling causes poor conveyance, 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 feed mechanism consisting of a second feed roll 4 and a second pinch roller 5 is shown, and the rolled paper fed from the second feed mechanism A2 is cut into a predetermined amount by a rotary cutter 6 and a fixed cutter 7. Sent to the copying department. 8 is a developing device, 9 is a photoreceptor, 10 is a buffer, 11,1
3 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-clean 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 adjust the winding pattern of the roll paper to be supplied without complicating the configuration of the device itself. can be reliably corrected according to the roll diameter, and even in cases where an abnormally high tension is instantaneously applied to the roll paper due to a paper jam, etc., it is effective to some extent to prevent roll paper breakage accidents. An object of the present invention is to provide a curl correction device for a sheet feeding device that can prevent curling.

That is, the present invention is a curl correction device to be disposed in a paper feeding device using roll paper, and for pressing paper to be fed in a tensioned state in a direction opposite to the curl. a pressing member, and a variable mechanism for varying the relative position of the pressing member and the supplied paper by changing the winding diameter as the rolled paper wound around the core material is fed out and supplied, The variable mechanism is composed of a motor that rotates according to changes in the winding diameter of the roll paper and a cam fixed to the drive shaft of the motor, and the pressing member is detachably supported with respect to the variable mechanism. It is something.

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.

(Function) According to the above-mentioned technical means, as the roll paper is fed out one after another, the motor constituting the variable mechanism rotates by a predetermined angle depending on the winding diameter of the roll paper, and the motor A cam fixed to the drive shaft variably sets the position of the pressing member in correspondence with the winding diameter of the 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.

Furthermore, since the pressing member is supported so as to be detachable from the variable mechanism, if an abnormal external force is applied to the pressing member from the roll paper side, the pressing member will separate from the variable mechanism. move in the direction.

(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 under tension between the cutter 1 and the second feed mechanism A2, and its tip is on standby in front of the cutter.

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 stop, 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.

A pressing roller is used as the pressing member 19 for pressing the roll paper 1 fed under tension in the direction opposite to the winding curl, that is, downward, and the shaft has a bearing 19a in a groove 21 formed in the side plate 20.
The paper is fitted through the paper, and its own weight presses the paper to correct it flat.

In addition, if the pressing member is a stationary type, there is a risk that it will act as a large braking force (back tension) when paper curl correction is at its maximum, making it impossible to convey the paper smoothly, so the pressing roller is a free-rotating type. Or it is arranged as a forced rotation type.

A variable mechanism for varying the relative position between the pressing member and the paper by changing the winding diameter as the roll paper wound around the core material is fed and fed, that is, in the embodiment, the pressing roller is moved up and down. The mechanism for this is configured as follows.

The bearing 19a of the pressure roller is the rotating cam 2
3 (for example, an eccentric cam), and the rotating cam 23 is supported by a spacer 25 on the side plate 20.
Motor 2 fixed with mounting screws 26 through
It is fixed to the rotating shaft 24a of No. 4.

As shown in Figure 1, roll paper 1 wrapped around a core material
A roll diameter sensor 22 is provided to sequentially detect the outer diameter of the roll in contact with the roll diameter sensor 22, and as the roll diameter decreases, the roll diameter sensor 2
The motor 24 is rotated by the signal from the rotary cam 23, and the rotary cam 23 is thereby rotated. Therefore, even if the curl amount changes as the winding diameter of the roll paper becomes smaller, the curl correction amount can be increased correspondingly, and the paper can always be fed in a flat form.

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 correcting curls and flatness by pressing in the direction, it is ideal for being incorporated 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 copy errors as seen in conventional copying machines.

Furthermore, in the present invention, the relative position between the pressing member and the paper can be changed even if the roll diameter changes and the curl becomes stronger as the roll paper wound around the core material is fed out and fed. Since it is equipped with a variable mechanism, it is possible to correct curling in response to changes in the roll diameter, and it is possible to constantly feed flat paper, making it extremely useful as a curling correction device for this type of paper feeding device that uses roll paper. It is valid.

Furthermore, in this invention, since the variable mechanism of the pressing member is composed of a motor that rotates according to changes in the roll diameter and a cam fixed to the drive shaft of this motor, the variable mechanism of the variable mechanism is Since the configuration itself can be simplified, it is possible to effectively prevent the device configuration from becoming complicated.

Furthermore, since the pressing member is detachably supported with respect to the variable mechanism, if the weight of the pressing member is adjusted appropriately, for example, the roll paper to be fed may become jammed and cause an accident. If an abnormally high tension is applied to the roll paper, the pressing member will separate from the variable mechanism, which will suppress the temporary excessive tension of the roll paper and prevent roll paper breakage accidents to some extent. It can be prevented.

[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. Explanation of symbols A...Paper feed section side, B...Copying 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, 2
0...Side plate, 21...Groove, 22...Roll diameter sensor,
23... Rotating cam, 24... Motor, 25... Spacer, 26... Installation screw.

Claims (1)

[Scope of Claims] 1. A curl correction device to be disposed in a paper feeding device using roll paper, which presses the paper to be fed in a tensioned state in a direction opposite to the curl. and a variable mechanism for varying the relative position between the pressing member and the paper to be fed by changing the winding diameter as the roll paper wound around the core material is fed out and fed. The variable mechanism is composed of a motor that rotates in response to changes in the winding diameter of the roll paper and a cam fixed to the drive shaft of the motor, and the pressing member is detachably supported with respect to the variable mechanism. A curl correction device for a paper feeding device, characterized in that: 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.