JPS60256171A - Form separating device of copying machine or the like - Google Patents

Abstract

PURPOSE:To obtain an image with good quality for a long period without flawing the surface of a photosensitive body by separating a copy form, etc., from the photosensitive body by air suction without contating the phototsensitive body. CONSTITUTION:The form separating device 1 has an internal pipe 2 arranged so that the outer peripheral surface 2a faces the surface of the photosensitive body 20 and an external pipe 3 provided outside of the internal pipe 2. One terminal of the internal pipe 2 is closed and the other terminal is connected to a vacuum pump 6 through piping 5; and the internal pipe 2 is provided with four air intakes axially and successively to make a communication between the inside and outside through the air intakes 7, and the internal pipe 2 is arranged so that the air intakes 7 face the surface 20a of the photosensitive body. The external pipe 3 is set at a stand-by position where, for example, an air suction port 8 faces sideway before form separation; and the copy form 21 contacts the surface 20a of the photosensitive body and the transfer of a toner image 22 is started. When the front end part 21a of the copy form 21 is sent to a separation position near the external pipe 3, a motor 12 is driven and the external pipe 3 is rotated as shown by an arrow B until the air suction port 8 meets an air intake 7, so that the copy form 21 contacting the photosensitive body 20 is sucked with air to separate from the surface 20a.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a method for peeling paper such as copy paper that is in close contact with the surface of a photoreceptor in a copying machine or the like from the photoreceptor for 1 m or more. The present invention relates to a paper peeling device, particularly a paper peeling device 11, which uses air suction to peel paper without contacting the photoreceptor surface and the image transfer side surface of the paper.

(Prior Art) Normally, in an electronic copying machine, after forming an image of a document on the surface of a rotating drum-type electronic photoreceptor, copy paper is placed on the surface of the photoreceptor using electrostatic attraction. The toner image is transferred to the copy paper by adsorption. In order to peel the copy paper with the toner image transferred from the photoreceptor, conventionally, the paper is fed in close contact with the photoreceptor surface. A peeling claw was inserted between the leading end and the surface of the photoreceptor, or an 8-inch belt was placed between the left and right ends of the paper and the surface of the photoreceptor.

However, J
3, since the peeling nail is constantly in contact with the surface of the photoreceptor, the surface of the photoreceptor is damaged by the peeling nail, resulting in a problem in which the image in the area 1) comes off as white.

In addition, in this device, the tip of the peeling claw scrapes the surface of the paper on the image transfer side, destroying the transferred image, and the developer attached to the tip of the peeling claw also adheres to the paper when the paper is peeled off. Problems have been recognized in which the paper may become stained by the paper, and furthermore, when the peeling claw receives an external force due to vibration or the like, a peeling error occurs. When the paper is peeled off using the aforementioned belt, the left and right edges of the paper are covered with this belt, making it impossible to copy. A black line appears on the side edge.
Furthermore, if the paper is shifted in the left-right direction by more than the width of the belt, a peeling error may occur.

The problem of copy paper peeling in electronic copying machines has been explained above, but the exact same problem occurs in facsimile machines that reproduce received images using electrophotography, for example!
I do it.

(Problems to be Solved by the Invention 1)) Therefore, the present invention solves problems such as damage to the photoreceptor of copying machines, destruction of transferred images, staining of paper by developer, peeling errors, and furthermore, the image forming area is small. The purpose of this paper is to provide a solution to the problem of paper stripping in copiers, copy machines, etc.

(Means for Solving the Problems) The paper peeling device of the present invention, such as a copying machine, has an inner tube arranged such that its outer peripheral surface faces the surface of a photoreceptor of a copying machine, etc. an air inlet provided in the inner tube at a position close to the surface of the photoreceptor to communicate the inside and outside of the inner tube; and an air inlet provided on the outside of the inner tube at a predetermined distance from the surface of the photoreceptor. , an outer tube that is rotatable while maintaining airtightness with the outer circumferential surface of the inner tube; an air suction port provided in the outer tube that communicates the inside and outside of the outer tube; and an air suction port provided in the outer tube; The apparatus is characterized in that it is comprised of an air suction means communicated with the inner tube, and a rotation drive means for rotating the outer tube around the inner tube.

(Function) When the outer tube is rotated by the rotation drive means and the air suction port is aligned and communicated with the air intake port of the inner tube, air is drawn from the air suction port by the air suction means communicating with the inner tube. is attracted. When air suction is performed in this way,
The paper that has been in close contact with the surface of the photoreceptor is attracted by the air and adsorbed to the air suction port of the outer tube. Then, as the outer tube continues to rotate, the paper is pulled by the outer tube and peeled off from the surface of the photoreceptor.

The above-mentioned air suction starts when the outer tube reaches a predetermined rotational position and the air suction port and air intake port are aligned, so the paper can always be peeled off from a predetermined position on the photoreceptor, and When the air suction port of the tube is displaced from the air inlet port of the inner tube, air suction is stopped and the paper is separated from the outer tube and is transported by, for example, a paper transport or the like and hangs.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIGS. 1 and 2 show an embodiment of the paper peeling device of the present invention. Paper Peeling-4 of this Embodiment The apparatus 1 is, for example, formed to peel a copying paper 21 from the surface 20a of a drum-shaped photoreceptor 20 of a copying machine. In FIG. 2, a toner image 22 of the original is formed on the surface 20a of the photoreceptor 20, which is rotated in the six directions of arrows, by a known h-brushing process, and then the copy paper 21 is attached to the surface 20a by electrostatic attraction. [Transfer] The toner f&22 is transferred onto the copy paper 21 by the rotron 23.

The paper peeling device 1 includes an inner tube 2 arranged such that an outer circumferential surface 2a faces the surface 20a of the photoreceptor 20, and this inner tube 2.
It has an outer tube 3 provided on the outside of the tube. Above inner tube 2
One end is closed, and the other end is connected via piping 5 to a vacuum pump 6 as air suction means. Also, inner pipe 2
The inner tube 2 is provided with four air introduction lowers arranged in the tube axis direction, and the inside and outside of the inner tube 2 are communicated with each other by these air introduction lowers. The inner tube 2 is arranged such that the air introduction lower part faces the surface 20a of the photoreceptor 20.

On the other hand, the outer tube 3 has an inner diameter set to be slightly smaller than the outer diameter of the inner tube 2, and can rotate around the inner tube 2 while maintaining airtightness with the outer peripheral surface 2a of the inner tube 2. Therefore, four air suction ports 8 are installed in this outer tube, arranged in the tube axis direction so as to be aligned with the air introduction lower of the inner tube 2, and communicating between the inside and outside of the tube. A tube 9 made of, for example, rubber is fitted into the air suction port 8 . Further, a gear 10 is coaxially fixed to the outer tube 3, and the tooth width 10 is rotated by a motor 12 via a gear train 11, so that the outer tube 3 is rotationally driven in the direction of arrow B in the figure. .

A cleaning brush 13 is disposed near the outer tube 3 so as to be able to come into contact with the outer tube 9.

Before paper separation, the outer tube 3 is set, for example, in a standby position with its air suction port 8 facing in the horizontal direction (rightward in FIG. 2). Then, as described above, the copying M21 comes into close contact with the surface 20a of the photoreceptor 20 and transfer of the toner image 22 is started, and when the leading end 21a of the copying paper 21 is sent to a peeling position close to the outer tube 3, The motor 12 is driven, and the outer tube 3
is rotated in the direction of arrow B. In order to control the drive of the motor 12 in this way, the position n of the tip 21a of the copying M21 is detected by the sensor 9, and the detection signal of
The drive of the remoter 12 may be controlled, or the motor 12 may be driven down after 200 revolutions of the photoreceptor and an R71 period.

When the outer tube 3 rotates, its air suction port 8 aligns with and communicates with the air introduction lower of the inner tube 2, so that the vacuum pump 6 sucks air from the duplex 9 toward the inner tube 2. When covered, the copy paper 21 that is in close contact with the photoreceptor 20 is attracted by this air and is attracted to the tube 9, and its tip 21a is peeled off from the surface 20a of the photoreceptor 20. As is, outer tube 3
When the copying paper 21 is rotated, the copying paper 21 is pulled by the outer tube 3, and the leading end 21a of the copying paper 21 is transferred to the transbow 1 in front of the outer tube 3.
4 Guide 25”]. In this state, the outer tube 3
advances to the position where the air suction port 8 is removed from the air introduction [-17 of the inner tube 2, and the communication between the air suction port 8 and the air introduction [-17 is cut off, and the air suction from the duplex 9 becomes fL+
t will be done. Therefore, here M21 for copying is tube 9.
The model is separated from the machine and transported to the transport 24. Note that the above-mentioned air suction is performed while the air suction port 8 and the air introduction lower are aligned and communicated 1), so that the copy paper 21 always starts to be peeled off at a predetermined position on the photoreceptor 20. , and is separated from the tube 9 at a predetermined position. By changing the length of the air introduction lower, it is possible to appropriately set the position where the copying M21 leaves the outer tube 3. Therefore, the copying paper M21 can be moved away from the outer tube 3 at the most preferable position to reliably send the copying paper 21 to the transport 24. 21 may be separated from the outer tube 3.

The outer tube 3 continues to rotate until it reaches the standby position and is stopped at this standby position.
contacts the cleaning brush 13, and the tube 9 is cleaned by this cleaning brush 13.

Therefore, even if the tube 9 becomes dirty with developer or the like, this dirt is cleaned every time the outer tube 3 rotates, so that the back surface of the copy paper 21 (the surface opposite to the image transfer side) is not contaminated by the tube 9. Of course, the duplex 9 is the photoreceptor 20.
surface 20a and surface of M21 for copying (image transfer side surface)
Since the surface 20a of the photoreceptor 20 may be damaged, the transferred image transferred to the copy paper 21 may be destroyed, or the surface of the copy paper 21 may be stained by the developer.

As shown in FIG. 3 of the tube, a plurality of notches 9a are provided at the tip, and these notches 9a are formed during the cleaning.
The part between A and J is designed to freely deform and improve the cleaning effect. Further, the tube 9 is made of rubber or other bamboo material as described above, and therefore the photoreceptor 2
Even if the surface 20a of the photoreceptor 20 is uneven and the tube 9 comes into contact with the surface 20a, the tube 9 will not damage the surface 20a of the photoreceptor 20.

The number of air introduction lowers and air suction ports 8 is not limited to four each in the above embodiment, but may be set to any other suitable number. Alternatively, the copying paper 21 may be directly attracted to the outer circumferential surface of the outer tube 3 without providing the above-mentioned round tube 9.

(Effects of the Invention) As explained in detail above, the paper peeling device for copying machines, etc. of the present invention is capable of peeling paper such as copy paper from the photoreceptor without contact with the photoreceptor by air suction. Because of this, the surface of the photoreceptor does not become uneven (therefore, the above-mentioned white spots are not generated, a high quality image can be obtained, and the life of the photoreceptor is extended.Also, according to the present invention, Since the paper peeling device is designed to attract the back side of the paper, it does not destroy the transferred image, stain the paper surface with developer, or narrow the image forming area of the paper, and furthermore, it does not remove the paper. Since the paper is adsorbed and peeled off from the photoreceptor by air suction, the paper can be reliably peeled off even if an external force such as vibration is applied, or even if the paper is misaligned in the width direction. It is possible.

[Brief explanation of the drawing]

1 and 2 are a partially cutaway perspective view and a side view showing an embodiment of the device of the present invention, respectively, and FIG. 3 is a perspective view showing an enlarged part of the -1-2 actual male side device. It is. 1... Paper stripping device N 2... Inner tube 2a... Outer peripheral surface of inner tube 3... Outer tube 5... Piping
6...Vacuum pump 7...Air inlet 8...Air suction port 10...Southeast 11...Gear train 12...Motor 2o...Photoreceptor

Claims (1)

[Claims] An inner tube is arranged such that its outer circumferential surface faces the surface of a photoconductor of a copying machine or the like in which paper is densely packed, and an inner tube is provided in the inner tube at a position close to the surface of the photoconductor. an air inlet for communicating with the outside; an outer tube provided on the outside of the inner tube at a predetermined distance from the surface and rotatable while maintaining airtightness with the outer peripheral surface of the inner tube; and an inner tube of the outer tube. A copying machine comprising an air suction port provided in the outer tube so as to communicate with the outside, and rotational drive means for rotating the outer tube around the inner tube, such as air suction means communicated with the inner tube. etc. paper peeling device.