JPH04313783A - Form peeling device for form holding device - Google Patents

Abstract

PURPOSE:To excellent execute a peeling action by providing an auxiliary means for peeling on a transfer drum instead of directly peeling a form through the use of a pawl member when the form is peeled from the transfer drum holding the form, on the device of a color copying machine, etc. CONSTITUTION:The form is held on the surface of the transfer drum 1, and an image from a photosensitive body arranged to be opposite to the transfer drum is transferred on the form. On the transfer drum 1, a jumping member 10 is arranged on a part where the tip end part Pa of the form is located, and the pawl member of the center of a peeling pawl unit 20 presses the jumping member 10. After the tip end part of the form is peeled, the form is peeled by the other pawl members.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a paper holding mechanism in a transfer drum that rotates along an image transfer section while holding paper in a color copying machine or the like. The present invention relates to a device in which a claw member performs a peeling operation via a flip-up member.

0002

2. Description of the Related Art In devices such as color copying machines, a plurality of toner image forming devices are arranged around a transfer drum, and each toner image forming device forms a color image of a different color on the transfer drum. A method is used to transfer the image onto a sheet of paper held at the same time. As the color copying machine, one having a configuration as shown in, for example, Japanese Patent Publication No. 1-107280 is known. In the apparatus shown in the conventional example, the transfer drum is rotated while the paper is electrostatically held around the transfer drum, and a plurality of color toner images are transferred during the rotation of the transfer drum. The images created by the image forming apparatus are transferred in a superimposed manner.

[0003] In the apparatus having the above-mentioned configuration, for example, electrostatic suction and holding means is used to hold the paper around the transfer drum. The transfer drum provided with the suction holding means is provided with a paper peeling mechanism as shown in FIG. 6, for example. In the conventional example shown in FIG. 6, the transfer drum 1 is composed of flanges 2 on both sides, a tie plate 6 connecting the flanges, and a holding drum member 7 formed in a cylindrical shape around the drum. The holding drum member 7
On the other hand, means is used to attract and hold the paper P using static electricity. A photoreceptor 15 is arranged on the drum 1 as shown in FIG. 7, and the toner image formed on the photoreceptor is transferred to a sheet of paper held by the drum. .

The photoreceptor 15 is equipped with a toner image forming means having the same structure as a general electronic copying machine, and a plurality of photoreceptors are arranged around the transfer drum 1. A different color image is formed on each photoreceptor, and each color image is transferred to paper one by one each time the transfer drum rotates once. After all color images have been transferred to the paper, the transfer is performed. Peel the paper from drum 1,
The image is conveyed to a fixing device, where a fixing action is performed to create a copy.

As mentioned above, in order to peel paper from the transfer drum 1, a peeling claw unit 20 is arranged corresponding to the transfer drum 1, and a large number of claw members 30 provided on the peeling claw unit 20 are arranged. ~34 holds the holding drum member 7
The paper is peeled off from the surface of the paper. Further, a hole 8 is provided in the transfer drum holding drum member 7 in correspondence with the central claw member 30 for peeling the paper from the holding drum member 7, and the center claw member 30 first enters the hole 8. Then, the leading edge of the paper is peeled off, and then the claw members 31 to 34 on both sides of the central claw member perform the peeling action.

As mentioned above, the paper P is transferred from the transfer drum 1.
In order to perform the peeling action, the claw holding plate 21 of the peeling claw unit 20 is supported via the support shaft 22, and the claw member is urged to be pressed toward the drum via the arm 23. There is. Further, rollers 25 are provided at both ends of the claw holding plate 21 so that the rollers 25 roll along the flange 2, and when the rollers 25 enter the recess 3 of the flange 2, the claw members are It is swung in a direction that brings it closer to the holding drum member.

In the paper peeling means, the operation of peeling the paper from the drum is performed as shown in FIGS. 8 to 10. The example shown in FIG. 8 shows a state in which an image is being transferred to paper P, and in this case, the peeling claw 30 is located at a position separated from the surface of the transfer drum 1. Therefore, the paper held on the transfer drum 1 is
The paper P is sucked and held by the holding drum member 7.
The tip of the hole 8 is located in the hole 8.

On the other hand, when the roller 25 is inserted into the hole 3 of the flange 2 as shown in FIG. The tip of the claw 30 is brought into engagement with the tip Pa of the paper P so that Then, in the next step, when the central claw member 30 is returned to its original position, the leading edge Pa of the paper is flipped up by the claw, and the claw member adjacent to the claw 30 is lifted up, as shown in FIG. Since the paper is thrust into the lower part of the paper, the paper is peeled off from the surface of the holding drum member 7 by these claw members.

[0009]

However, in the apparatus configured as described above, for example, as shown in FIG. However, setting the state in which the paper is inserted deeply is problematic from the viewpoint of the mechanism of the device, and the work of peeling the paper is usually performed with the tip of the claw inserted into the hole relatively shallowly.

However, as mentioned above, when the tip of the claw enters the hole shallowly, as shown in FIG.
The tip of the pawl 30 may engage with the tip Pa of the sheet, and the sheet is pushed by the pawl, resulting in poor peeling. As described above, if the paper is not peeled off properly, the tip of the nail may damage the paper or the paper may become unusable. In addition, if the tip of the claw does not penetrate into the hole to the extent necessary for peeling, the paper is not peeled and the jam detection means is activated.
A problem occurs in which the operation of the copying machine stops, and the operator has to deal with subsequent recovery work.

[0011]

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional device, and the purpose of the present invention is to prevent the leading edge of the paper from directly jumping up using the peeling claw member, but to allow the leading edge of the paper to bounce into the hole provided in the holding drum member. A raising member is placed, and via the flipping member,
It is an object of the present invention to provide a device that is configured to perform an operation of peeling off the leading edge of the paper, thereby making it possible to perform the operation of peeling off the paper in a stable state.

0012

[Means for Solving the Problems and Effects] The present invention provides a paper adsorption film on the circumferential surface of a rotating transfer drum, and uses a specific position on the circumference of the drum as the tip to attract the paper by static electricity. The present invention relates to an apparatus configured to hold the paper by suction, position the paper held by the drum at a hole into which a peeling claw is inserted, and peel the paper by the peeling claw means.

[0013] In the apparatus of the present invention, with respect to the hole provided in the holding drum member of the transfer drum, the fixing portion is provided at the upstream portion in the rotational direction, and the downstream portion is made of a free spring material. A flip-up member is provided, and when the peeling claw member presses the flip-up member, the tip of the flip-up member acts to flip up the paper, thereby peeling the tip of the paper from the transfer drum. are doing.

With the above-described structure, in the paper peeling device of the paper holding device of the present invention, a relatively elastic member such as a plastic film is installed in the hole provided in the holding drum member. The structure of the peeling member does not become complicated. Further, in the present invention, since the action of peeling the paper from the drum is performed accurately, problems such as poor peeling can be prevented from occurring, and the operability of the copying machine can be improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the paper peeling device of the paper holding device of the present invention will be explained according to the illustrated example. In the transfer drum 1 of the present invention shown in FIG. 1, a drum member for holding paper is arranged between flanges 2 and 4 on both sides and between the flanges 2 and 4, as in the case of a conventional transfer drum. It is composed of a plurality of tie plates 6 and a cylindrical holding drum member 7. The holding drum member 7 is made of a thin plastic film, and its both sides are fixedly held to the flanges 2 and 4, and also fixed to the tie plate 6 located at a predetermined part inside the cylinder. be done. The drum member is supported by a shaft member 5 that projects outward from the flanges 2 and 4, and is rotated while holding the paper.

Further, a peeling claw unit 20 is arranged at a paper peeling position with respect to the transfer drum 1. The peeling claw unit 20 includes a claw holding plate 21 that is swingably provided via a support shaft 22, and a large number of claw members arranged at predetermined intervals with respect to the claw holding plate 21. Among the pawl members, the central pawl member 30 is configured with a long one, and the other pawl members 31 to 34 are configured with relatively short ones. And, corresponding to the central claw member 30,
A hole 8 is provided in the holding drum member 7, and a central pawl member 30 acts on the hole 8 to peel the paper from the drum surface.

In the transfer drum 1, a recess 3 is provided at a predetermined position of one flange 2, and a roller 2 is provided on the side of the claw holding plate 21 in correspondence with the recess 3.
5 is set. Further, an arm 23 is arranged between the support shaft 22 and the roller shaft with respect to the claw holding plate 21 of the peeling claw unit 20, and a solenoid 27 is provided to the arm 23 via a spring 26. ing. Then, when peeling the paper from the transfer drum 1, by turning on the solenoid 27, the peeling claw unit 2
0 in the clockwise direction in the figure through the shaft 22, and when the roller 25 enters the recess 3, the central pawl member 30
The tip end of the hole 8 enters the hole 8.

In the transfer drum 1 of the present invention, a flip-up member 10 is disposed at the hole 8. The flip-up member 10 is disposed corresponding to the rotational direction of the transfer drum 1, and the base portion 11 of the flip-up member is attached to the tie plate 6, and the tip portion 12 is placed over the end of the hole. It will be placed in Then, the paper is held against the transfer drum 1 in a state where the leading end Pa of the paper P is applied to the hole 8 and the flip-up member 10.

The embodiment shown in FIG. 2 shows the relationship between the transfer drum 1 of the present invention and a photosensitive drum 15 for forming a toner image. A color image is transferred from the photosensitive drum 15 to P, and when the image transfer operation is completed, a peeling means is activated to peel the paper and send the paper toward the fixing device. Make it. In addition, in the example shown in FIG. 2, with respect to the central claw member 30,
A guiding roller 35 can be provided at the predetermined position. When the roller is provided on the central pawl member 30, it is possible to effectively press the flip-up member 10 when performing the paper peeling action, and the pawl member can also press the flip-up member 10 in a good manner. This can prevent problems such as getting caught on the edges.

In the apparatus of the present invention constructed as described above, the action of the pawl member when performing the paper peeling operation will be explained with reference to FIGS. 3 to 5. The example shown in FIG. 3 shows a case where an image is transferred while a sheet of paper is held on the surface of the transfer drum 1. As shown in FIG. 3, when transferring an image, the leading edge Pa of the paper P is held at the intermediate portion of the flip-up member 10, and the peeling claw device is attached to the transfer drum. It is located at a distance from the surface of 1.

When the transfer of the image onto the paper is completed and the solenoid shown in FIG. The tip of the central pawl member 30 is still held at a position away from the transfer drum until the roller provided at the flange enters the recess of the flange. Then, transfer drum 1
When the roller enters the recess provided in the flange due to the rotation of It will be in a state where it will be pressed towards the target. When the flip-up member 10 is pressed, the tip end 1 of the member 10
2 exerts an action of flipping up the leading edge of the paper, and the central claw member 30 enters the lower part of the leading edge Pa of the paper, and the action of peeling the paper by the claw member is activated. will be started.

In the state shown in FIG. 4, the transfer drum 1
When further rotates, as shown in FIG. 5, the paper P is peeled off from the transfer drum 1 by the central claw member 30 and other claw members, and even after the claw holding plate returns to its original position, The action of peeling off the paper by the claw member continues. Further, when the pressing member 10 at the center is released, the flip-up member 10 returns to its original position as shown in FIG. 3, and can be adapted to support the next sheet.

In the apparatus of the present invention constructed as described above, corotron means or the like is used as a means for holding the paper on the surface of the transfer drum 1 by static electricity, as in the case of the conventional apparatus. Therefore, as the holding drum member 7, a plastic film member with good charging property can be used.

[0024]

[Effects of the Invention] Since the paper peeling device of the paper holding device of the present invention has the above-described configuration, a relatively elastic material such as a plastic film is used in the hole portion provided in the holding drum member. Since only a member having a large property is disposed, the structure of the peeling member does not become complicated. Further, in the present invention, since the action of peeling the paper from the drum is performed accurately, problems such as poor peeling can be prevented from occurring, and the operability of the copying machine can be improved. Furthermore, in the paper peeling means of the present invention, since the claw member does not directly perform a peeling action on the leading edge of the paper, the claw member does not insert deeply into the hole, and the tip of the claw member does not touch the edge of the hole. This prevents the transfer drum from getting caught and damage to the transfer drum.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the relationship between a transfer drum and a peeling device of the present invention.

FIG. 2 is an explanatory diagram showing the relationship between a transfer drum and a photosensitive drum of the present invention.

FIG. 3 is an explanatory diagram showing the relationship between the claw member and paper while an image is being transferred.

FIG. 4 is an explanatory diagram of the first stage of peeling paper from the transfer drum.

FIG. 5 is an explanatory diagram of an operation for peeling paper.

FIG. 6 is a perspective view showing the structure of a conventional transfer drum.

FIG. 7: A transfer drum and a peeling member in a conventional device;
FIG. 3 is an explanatory diagram showing the relationship between the photoreceptor drum and the photoreceptor drum.

FIG. 8 is an explanatory diagram showing the relationship between a claw member and a sheet of paper while an image is being transferred in a conventional device.

FIG. 9 is an explanatory diagram of the first stage of separating paper from a transfer drum in a conventional apparatus.

10 is an explanatory diagram of the peeling action following FIG. 9. FIG.

FIG. 11 is an explanatory diagram of a state in which paper separation failure occurs.

[Symbols in the diagram]

1 Transfer drum 2.4 Flange 3 Recessed part 6　　　　Tie plate 7 Holding drum member 8 holes 10 Flip-up member 15 Photosensitive drum 20 Peeling claw unit 21 Claw holding plate 22 Support shaft 23 Arm 25 Roller 26 Spring 27 Solenoid 30 Central claw member 31-34 Claw member

Claims (1)

[Claims] 1. A paper suction film is provided on the circumferential surface of a rotating transfer drum, and the paper is attracted and held by static electricity, with a specific position on the circumference of the drum as the tip, and the paper is sucked and held by the drum. In the device, the paper is positioned in a hole in which a peeling claw is inserted, and the paper is peeled off by the peeling claw means, with respect to a hole provided in the drum in a rotating direction. A flip-up member is provided which has a fixed part in the upstream part and is made of a spring material with a free downstream part, and by pressing the flip-up member with the peeling claw member, the tip of the flip-up member is A paper peeling device for a paper holding device, characterized in that the paper peeling device performs an action of flipping up the paper to peel the leading end of the paper from the transfer drum.