JPS6213080Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for winding a sheet-like material around a rotating body in an electrophotographic copying machine, an electrostatic recording device, a printing machine, etc.

Conventionally, various devices have been proposed for wrapping a sheet material around the peripheral surface of a drum or belt. When wrapping a sheet-like body around a rotating body, the sheet-like body must be brought into close contact with the surface of the rotating body. Therefore, a plurality of pressure rollers are arranged around the rotating body so that the sheet-like body is tightly wound around the rotating body. However, if the pressure rollers are placed around the rotating body, it becomes a considerable constraint in arranging various processing equipment around the rotating body, and there is a drawback that there is no margin in the design. In the case where the sheet-shaped body and the pressure roller should not come into contact with each other, a large number of devices are required to separate the plurality of pressure rollers from the rotating body, and the mechanism for this is complicated and expensive.

Furthermore, when inserting a sheet into the machine, the operator of the sheet presses the sheet lightly with his/her hand to apply a braking action while winding the sheet around the rotating body. However, the drawback is that the operator has to hold the sheet in place until it is completely inside the machine, and even if the operator presses down to the rear end of the sheet, even if the rear end leaves the hand, the Since the whole body is not in close contact with the rotating body, it will become loose again. 1st
The figure shows a conventional method in which a photoreceptor sheet 1 is inserted from a sheet guide plate 2 in the direction of arrow A, and a rotating drum 3 is
It shows what is wrapped around. A groove 4 is formed in the rotating drum 3, and the photoreceptor sheet 1 is inserted into this V-groove 4.
A gripping member 5 is provided to grip the tip of the.
A charging device 6, an exposure device 7, a magnetic brush developing device 8, and a transfer device 9 are arranged around the rotating drum 3. Incidentally, in such an electrophotographic copying machine, a lifting phenomenon of the photoreceptor sheet 1 occurs near the V-groove 4 as shown in the figure. For this reason, various conditions such as charging conditions, development conditions, and transfer conditions are different from those of other parts, so there is a drawback that a uniform toner image cannot be formed not only on the photoreceptor sheet 1 but also on the transfer paper. It was hot.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a novel sheet-shaped body winding device that can tightly wrap a sheet-shaped body around a rotating body.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows one embodiment of the sheet-like body 10 used in the present invention. This sheet-like body 1
0 has a plurality of holes 11 and 12 at the left and right ends, respectively, and a photosensitive layer 13 made of a photoconductive material is formed on the surface except for the left and right ends. As the photoconductive substance, zinc oxide, organic photoconductor, etc. are used. Below the photosensitive layer 13 is an electrically conductive layer (not shown), and further below that is an insulating support 14. At the left and right ends of the sheet-like body 10, the conductive layer and the support 14 are layered.

On the other hand, the electrophotographic copying machine used in the present invention has the configuration shown in FIG. 3, for example. Of course, it is not limited to this configuration. In the figure, a rotating drum 15 rotates in the direction indicated by the arrow, and a photoreceptor sheet is wound around its circumferential surface. A charging device 1 is installed around the rotating drum 15.
6, exposure device 17, developing device 18, transfer device 1
9. The static eliminators 20 are arranged in this order. The exposure device 17 is composed of an illumination lamp 22 that illuminates the document on the document table 21 that reciprocates left and right, and a light converging light transmission member (self-locking optical system) 23 that projects the optical image of the document onto a photoreceptor. has been done. The developing device 18 includes a developing roller 24 having a permanent magnet fixed therein and a non-magnetic aluminum sleeve that rotates counterclockwise, and a toner replenishing device 25 that supplies one-component magnetic toner to the developing roller 24. has been done. The developing roller 24 forms a magnetic brush of one-component magnetic toner on the sleeve by the magnetic force of the magnet. To explain the operation of this copying machine, first, when the print button is pressed, the rotating drum 15 starts rotating in the direction of the arrow, the charging device 16 and the illumination lamp 22 are turned on, and the document table 21 moves forward to the right. . The photosensitive layer is a charging device 16
The original is uniformly charged, and then an optical image of the original on the original placing table 21 is projected by the light-converging optical transmitter 23. In this way, an electrostatic latent image is formed on the photosensitive layer. The surface of the photosensitive layer is rubbed by the magnetic brush of the developing device 18, and the electrostatic latent image is visualized. Since the developing device 18 uses one-component magnetic toner, the distance between the photosensitive layer and the sleeve is significantly narrower than in the case of a normal two-component developing method, and so-called gap management is important. If the gap is large, sufficient density cannot be obtained, and if the gap is small, the density becomes high.

The visualized electrostatic latent image is transferred to the transfer section.
Transfer paper 26 fed from a paper feeder (not shown)
A transfer device 19 consisting of a corona discharger is in close contact with
The image is electrostatically transferred to the transfer paper 26 by the . The transfer paper 26 on which the toner image has been transferred is fixed by a fixing device (not shown) and is discharged outside the machine. On the other hand, untransferred residual toner remains on the photosensitive layer after transfer. As a preliminary operation for removing this residual toner, the residual potential on the photosensitive layer is removed by the static eliminator 20. The static eliminator 20 is of the type that emits light at the same time as alternating current corona discharge or reverse polarity corona discharge. Thus, the first rotation of the rotating body 15 is completed, but the second rotation is subsequently performed. In the second rotation, the static eliminating action by the static eliminating device 20 and the cleaning action by the developing device 18 are mainly performed. Not only the charging device 16, the exposure device 17, and the transfer device 19, but also the document mounting table 21.
Forward movement, the paper feed device is inoperative. The photosensitive layer from which the static electricity has been removed is transferred to a developing roller 24 on which a magnetic brush is formed.
The toner remaining thereon is removed by mechanical rubbing force and magnetic attraction force. Since the surface of the photosensitive layer has been neutralized, it will not be developed. Of course, it is also effective to switch the developing device 18 to conditions suitable for cleaning, but this is not necessary in this embodiment. The photosensitive layer thus cleaned by the cleaning action of the developing device 18 is subjected to the above-mentioned action again for the next copying cycle, but if the next copying is not performed, the rotation is stopped or further , one more
The rotation is stopped by applying the same action as the second rotation to the photosensitive layer.

A first embodiment of the apparatus for winding the photoreceptor sheet shown in FIG. 2 around the rotating drum 15 will be described.

FIG. 4 shows a state in which a photoreceptor sheet 10 as a sheet-like body is inserted into a rotary drum 15 as a rotary body from outside the machine. In the figure, there is a groove 27 in a part of the rotating drum 15,
A sheet gripping member (hereinafter simply referred to as "gripping member") for gripping the leading end of the photosensitive sheet 10 from inside the rotating drum 15 protrudes into the groove 27 . Pins 29 are provided at the tip of the gripping member 28 at positions corresponding to the holes 11 of the photoreceptor sheet 10 and in the same number. A guide plate 30 serving as a guide member for inserting the photoreceptor sheet 10 is attached to the rotating drum 15 and arranged in a substantially normal direction on the copying machine casing. It has a curved shape, so that when the photoreceptor sheet 10 is inserted from outside the machine, the photoreceptor sheet 10 is attached to the guide plate 30.
The brake member 31 attached to the tip of the brake member 31 does not come into contact with the brake member 31. The brake member 31 is attached to a downwardly bent end portion 30a of the guide plate 30 close to the rotating drum 15.
Its shape is configured to have a portion that contacts the photoreceptor sheet 10 over a wide area. As the material of this brake member 31, an elastic body having high frictional resistance is used at least in the portion that contacts the photoreceptor sheet 10. For example, resin foam, elastic rubber, etc. are used. A peeling claw 32 is provided on the upper part of the guide plate 30 close to the rotating drum 15. The peeling claw 32 is used to peel the photoreceptor sheet 10 from the rotating drum 15, and is replaced when the photoreceptor sheet 10 is used for copying a predetermined number of times and its life reaches its end.
The used photoreceptor sheet 10 peeled off from the rotating drum 15 by the peeling claw 32 passes through a passage 33.
The photoreceptor sheet is ejected to the insertion slot.

Now, when the photoreceptor sheet 10 is inserted into the machine,
Since the photoreceptor sheet 10 is curved to match the shape of the guide plate 30, its leading end is lifted upward and fed between the slope 27a in the groove and the gripping member 28. When the leading end of the photoreceptor sheet 10 abuts against the gripping member 28, the insertion operation ends. It goes without saying that the rotating drum 15 is stopped at the position shown in the figure at this time.

When the insertion operation of the photoreceptor sheet 10 is completed, the operator presses a plate feeding command button (not shown). When the plate feeding command button is pressed, the gripping member 28 rotates counterclockwise and comes into pressure contact with the slope 27a. The pin 29 on the gripping member 28 passes through the hole 11 of the photoreceptor sheet 10 and connects to the hole 27b formed in the slope 27a.
Get into it. This is the state shown in FIG. Next, the rotating drum 10 starts rotating in the direction indicated by the arrow, which causes the brake member 31 to press the photoreceptor sheet 10 fixed to the rotating drum by the gripping member 28 . When the rotating drum 10 rotates by a predetermined angle, the photoreceptor sheet 10 and the brake member 31 come into contact as shown in FIG. That is, the photoreceptor sheet 1 is rotated by the rotating drum 15.
0 and the guide plate 30 of the photoreceptor sheet 10
Since the movement direction is different from the above movement direction, a pressing force F is generated against this brake member 31, and since it is made of a material with a large coefficient of friction, the photoreceptor sheet 10
A braking action occurs against the movement of. This braking effect is caused by the rotating drum 15 of the photoreceptor sheet 10.
At the same time, the photoreceptor sheet 10 is properly aligned with respect to the rotating drum 15, and tilting of the photoreceptor sheet due to the holes 11 and pins 29 is prevented. Furthermore, diagonal feeding of the photoreceptor sheet 10 can be prevented. Since the brake member 31 is made of an elastic material, even if a large force is momentarily applied, the brake member 31 is compressed by the elastic force, so that the photoreceptor sheet 10 is not damaged. Therefore, the tip portion 30a of the guide plate 30 may also be made of an elastic material such as a leaf spring.

6 and 7 show a second embodiment of the present invention. In FIG. 6, the rotating drum 15
The groove 27 is stationary at the position shown.
A tip 34a of the guide plate 34 is bent downward, and a rotating roller 36 rotatably supported around a shaft 35 is attached thereto. In the vicinity of this rotating roller 36 and the photoreceptor sheet 10
A brake member 37 is provided on the insertion port side. The brake member 37 includes a lever 38 rotating around a shaft, an elastic body 39 provided at one end of the lever 38, a spring 40 attached between the shaft and the elastic body 39, and a spring 40 attached to the other end of the lever 38. It is composed of a solenoid 41. Since the solenoid 41 is normally demagnetized, the lever 38 is rotated clockwise by the force of the spring 40;
The elastic body 39 is retracted above the path of the photoreceptor sheet 10. Therefore, even if the photoreceptor sheet 10 is inserted, it will not be hindered by the brake member 37 in any way. When the photoreceptor sheet 10 is inserted and collides with the gripping member 28 of the rotary drum 15, the operator stops inserting the photoreceptor sheet 10. Then, as in the first embodiment, when the plate feeding command button is pressed, the gripping member 28 presses the photoreceptor sheet 10 against the slope 27a of the groove 27 and firmly grips the leading end of the photoreceptor sheet 10. Next, the solenoid 41 is energized at the same time or before or after the rotation of the rotary drum 15 starts. As shown in FIG. 7, when the solenoid 41 is energized, the lever 38 rotates counterclockwise against the force of the spring 40. Therefore, elastic body 3
9 moves downward and presses the photoreceptor sheet 10 on the guide plate 34 with a predetermined pressure. This elastic body is fixed so as not to rotate.

When the rotating drum 15 rotates, the photoreceptor sheet 1
The surface of 0 contacts the rotating roller 39. This rotating roller 36 is driven and rotated by the photoreceptor sheet 10. The rotating roller 36 does not apply a brake to the movement of the photoreceptor sheet 10, but rather reduces the resistance force so as not to damage the surface of the photoreceptor sheet 10. On the other hand, elastic body 3
9 is composed of a material with a large coefficient of friction,
For example, resin foam such as polyurethane foam,
Elastic rubber etc. are used. Since this elastic body 39 is in frictional contact with the back surface of the photoreceptor sheet 10, even if the support is slightly damaged, it will not cause any problem in image formation, so there is a much wider margin in design. . In this embodiment, photoreceptor sheet 1
Although it is convenient because the photosensitive layer 0 does not come into contact with the brake member, it is preferable to make the guide plate 34 corresponding to the elastic body 39 a smooth surface or to arrange it at a position where the rotating roller 36 and the elastic body 39 come into contact with each other. It will be more effective if you do.

In the above-mentioned embodiments, a drum-shaped rotating body was described, but it is also possible to use an endless belt-shaped rotating body. Of course, it can be used not only for photoreceptor sheets in electrophotographic copying machines, but also for a variety of other purposes, such as wrapping printing master paper around a drum in a printing machine, or wrapping an original drawing around a cylinder in an electrostatic recording device. stomach. The sheet-like body to be wound is not limited to one having gripping holes formed at the front and rear ends, and various types can be used depending on the type of gripping device for the rotating body.

Further, in the above-mentioned embodiments, the holding of the rear end of the photoreceptor sheet was not described in detail, but the conventional apparatus can be used as is for this purpose. For example, the apparatus described in Japanese Patent Application No. 52-58344 proposed by the present applicant can be used.

As described above, according to the present invention, when wrapping the sheet-like body around the rotating body, the braking action is applied to the sheet-like body, so that the sheet-like body can be brought into close contact with the surface of the rotating body, and the sheet-like body can be wrapped around the rotating body. Uniform adhesion can be achieved. Furthermore, it is possible to prevent the tip end of the sheet from skewing and wind the sheet around the rotating body in proper alignment. Furthermore, it is also possible to prevent the sheet-like body from being fed diagonally. And since it is a simple device, it is inexpensive.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a conventional electrophotographic copying machine.
FIG. 2 is a plan view of a sheet-like body (photoreceptor sheet) used in the present invention, FIG. 3 is a schematic configuration diagram of an electrophotographic copying machine showing an embodiment of the present invention, and FIG. FIG. 5 is a diagram showing the state of the sheet-like material winding device according to the first embodiment when the photoreceptor sheet is set, and FIG.
A diagram showing the state of the rotating drum of the device shown in FIG.
FIG. 6 is a diagram showing the state of the photoreceptor sheet being set in the sheet-like material wrapping device according to the second embodiment of the present invention, and FIG. 7 is a diagram showing the state of the rotating drum of the device shown in FIG. 6 when it is rotating. FIG. 10... Sheet-shaped body, 15... Rotating drum, 2
8...Gripping member, 30, 34...Guide plate, 3
1, 37... Brake member, 39... Elastic body.

Claims (1)

[Scope of utility model registration request] A rotating body having a groove long in the axial direction on a part of its circumferential surface, and a sheet-like body placed in the groove of the rotating body in a stopped state and arranged in a substantially normal direction to the rotating body. a guide member for guiding the tip;
a sheet gripping member that fixes the tip of the sheet-shaped body guided by the guide member in the groove, and the sheet-shaped body fixed in the groove is oriented in a direction in which the tip of the guide member is pressed. A sheet-like body wrapping device for winding the sheet-like body around the rotary body by rotating the rotary body, the sheet-like body wrapping device wrapping the sheet-like body around the rotary body after fixing the tip of the sheet-like body in the groove. A sheet-like body wrapping device characterized in that a brake member is provided at the tip of the guide member to come into frictional contact with the sheet-like body when the sheet-like body is rotated in the winding direction.