JPH04364Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transfer type electrostatic copying machine, and more particularly to an improvement in the structure of a conveying means for conveying copy paper near a photosensitive drum.

Generally, copy paper jams are likely to occur near the transfer area where the toner image formed on the photosensitive drum is transferred to copy paper. In the prior art, it cannot be said that sufficient measures have been taken to easily pull out jammed copy paper.

SUMMARY OF THE INVENTION An object of the present invention is to provide a transfer type electrostatic copying machine in which copy paper jammed near a photosensitive drum can be easily pulled out.

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention. At the top of the body 1, a document mounting table 4, which is composed of a transparent plate 2 and a document holding cover 3 for holding the document on the transparent plate 2, is provided so as to be horizontally movable as shown by the imaginary line. The document is illuminated by an exposure lamp 5 provided on the body 1. The original image is formed on the outer peripheral surface of the photosensitive drum 11 via the reflecting mirrors 6, 7, 8, the lens 9, and the reflecting mirror 10. The photosensitive drum 11 is charged by a corona discharger 12 during copying, and then an electrostatic latent image corresponding to the original is formed in the exposure area 13. This electrostatic latent image is developed into a toner image by a magnetic brush developing device 14.

The copy paper 16 stored in the cassette 15 is fed by the paper feed roller 17, and the copy paper 16 is fed by the paper feed roller 17.
19; conveyed toward the photosensitive drum 11 by 20 and 21. This transported copy paper contains
The toner image is transferred by the action of the corona discharger 22. The copy paper on which the transfer has been completed is separated from the photosensitive drum 11 by the separating claw 23, and is conveyed onto the guide plate 26 by being pinched by a separating roller 24 as an upper conveying member and a separating roller 25 as a lower conveying member. be done. The copy paper after this transfer is transferred to the roller 2.
The image is fixed by a fixing device 29 including 7 and 28,
Thereafter, the paper is discharged onto a tray 32 provided on the side of the machine body 1 by discharge rollers 30 and 31. Heat dissipation fans 33 and 34 are provided within the fuselage 1.

2 is a perspective view of the support body 35 including the photosensitive drum 11 and the developing device 14, FIG. 3 is a simplified front view of the vicinity of the photosensitive drum 11, and FIG.
The figure is a simplified perspective view of the vicinity of the photosensitive drum 11. Photosensitive drum 11 and magnetic brush developing device 1
4 is attached to the support body 35, and by pulling the handle 88, the side plate 36 on the near side of the body 1 can be removed.
It can be pulled out parallel to the axis of the photosensitive drum 11 by rails 37 and 38. The support body 35 includes a support side plate 40 on the front side and a support side plate 41 on the rear side.

The photosensitive drum 11 includes a portion on which a photosensitive layer 43 is formed and a small diameter portion 44 formed at the front end of the photosensitive drum 11 in the axial direction. This small diameter part 4
4, an end 45 of the separation claw 23 is close to the separation claw 23. This end portion 45 extends further inward in the radial direction of the photosensitive drum 11 than the surface of the photosensitive layer 43 . The separation roller 25 is parallel to the axial direction of the photosensitive drum 11 and extends over its entire length. Separation roller 24
is arranged downstream of the separation claw 23 in the copy paper conveyance direction. The separation roller 24 is rotatably supported around a support shaft 47 fixed to one end of a lever 46. The lever 46 is pivotally supported by a mounting member 50 integrally fixed to the support side plate 40 by a pin 48 so as to be freely angularly displaceable. Pin 48 of lever 46
One end of a spring 49 is locked to the opposite end of the separation roller 24. The other end of the spring 49 is locked to a mounting member 50 fixed to the support side plate 40. In this way the lever 46 is connected to the pin 48.
3 in the clockwise direction in FIG.

A detection piece 52 can be fitted into a detection hole 51 formed in the guide plate 26 . A rotating shaft 53 is fixed to this detection piece 52 . The rotating shaft 53 is rotatably inserted into the mounting member 50. A permanent magnet piece 54 is fixed to the other end of the rotating shaft 53. A detection element 55 that detects the angular displacement of the permanent magnet piece 54 is fixed to the side plate 36 of the body 1 . Also other configurations,
For example, a micro switch, a limit switch, or an optical detection means may be used. When the copy paper passes over the guide plate 26, the detection piece 52 is displaced above the detection hole 51 by the copy paper. As a result, the detection element 55 changes its switching mode. In this way, the passage of copy paper is identified. The support side plate 40 is provided with a stopper 56 for limiting the amount of clockwise angular displacement of the lever 46 in FIG. In this way, the separation claw 23, separation roller 24, lever 46, mounting member 50, etc. are fixed to the support body 35. The copy paper conveyed by the conveyance rollers 20 and 21 is guided by a guide plate 57 fixed to the side plate 36 of the machine body 1 and a guide plate 58 provided below the guide plate 57, and is guided to the photosensitive drum. 11 and a corona discharger 22. Conveyance rollers 20, 21
, the separation roller 24 , the separation roller 25 , and the guide plates 26 , 57 , and 58 constitute a conveyance means 60 .

With the support body 35 attached to the aircraft body 1,
One side of the copy paper after the transfer is completed is separated from the photosensitive drum 11 by a separating claw 23. The one side portion of the separated copy paper is pinched and pressed by the separation roller 24 and the separation roller 25 and sent out to the guide plate 26 side.

5 is a simplified front view of the vicinity of the photosensitive drum 11 on the upstream side in the copy paper conveyance direction, FIG. 6 is a sectional view taken from the cutting plane line - in FIG. 5, and FIG. 21 is a simplified horizontal sectional view of the fuselage 1 in relation to FIG. Conveyance roller 2
0 is supported by a side plate 36 in front of the body 1, and the other end is rotatably supported by a side plate 62 (see FIG. 7) provided at the rear of the body 1. Another conveyance roller 21 that comes into contact with this conveyance roller 20 is supported by a frame 63. Frame body 6
3 includes a support member 64 that supports one end of the transport roller 21 and a support member 65 that supports the other end of the transport roller 21 . The support member 64 is located inside the side plate 36 of the fuselage 1 (to the right in FIG. 6),
It has a contact surface 67 extending toward the front, that is, toward the side plate 36. A bracket 6 is attached to the side plate 36 of the fuselage 1.
8 and 69 are provided, and this bracket 6
A support shaft 70 having a horizontal axis is supported at 8 and 69 so as to be freely angularly displaceable. Cams 71 and 72 are fixed to both ends of the support shaft 70. The protrusions 73 of the cams 71 and 72 are provided so as to be able to abut against the contact surface 67 according to the angular displacement of the support shaft 70, and the support member 64 is moved up and down. One end of an actuation lever 74 is fixed to the support shaft 70 . The actuating lever 74 extends outward from the side plate 36 (to the left in FIG. 6) by passing through a long hole 75 formed in the side plate 36.
The other end portion extends toward the front side of the side plate 40 of the support body 35 attached to the body 1. This operating lever 74
A contact piece 76 that can come into contact with the support side plate 40 and a handle 74a are formed at the other end of the support side plate 40 . The support member 65 is supported by the side plate 62 by hinges 77 and 78 so as to be freely angularly displaceable. Support body 35
As is clear from FIG. 2, the support side plate 40 is formed with a handle 88 for pulling out the support body 35 toward the front. The frame body 63 also supports the separation roller 25 and the corona discharger 22, and also supports the guide plate 5.
8 is fixed.

When the support body 35 is attached to the machine body 1 and the operating lever 74 is raised as shown by the solid line in FIG. It abuts against the contact surface 67 on the inward (right side in FIG. 6) side of the body 1 from the line 82. As a result, the contact state between the transport roller 20 and the transport roller 21 is stably achieved, and the contact state between the separation roller 24 and the separation roller 25 is maintained stably. A copying operation is performed in this state.

When a paper jam occurs near the photosensitive drum 11, the handle 88 is pulled toward the user and the support body 35 is pulled out as shown in FIG. During this drawing operation, the photosensitive drum 11 and the support side plate 4
0 is the position indicated by reference numerals 11a and 40a in FIG. 6, respectively. At the beginning of such a drawing operation, the supporting side plate 40 comes into contact with the abutting piece 76 of the operating lever 74, thereby causing the operating lever 74 to
is angularly displaced around the support shaft 70 in the direction of the arrow 79 counterclockwise in FIG. As a result, cam 71
The protrusion 73 is released from contact with the contact surface 67 of the support member 64. The actuating lever 74 is now in the position indicated by reference numeral 80 in FIG. Therefore, the frame body 63 is moved by its own weight to the hinges 77, 7.
8, and the support member 64 is displaced downwardly. The abutment surface 67 abuts against a stopper 81 protruding inward on the side plate 36 . In this state, the conveyance roller 21 is at the position indicated by reference numeral 21a in FIG. 5, and is separated from the conveyance roller 20. Further, the separation roller 25 is referred to as reference numeral 25.
Displaced to the position indicated by a. Therefore, the separation roller 24 is displaced downward in FIG. 3 by the spring force of the spring 49. At this time, the lever 46 is moved to the stopper 56.
, and further angular displacement by the spring 49 is prevented. The separation roller 24 is thus displaced to the position indicated by reference numeral 24a in FIG. In this way, the separation roller 24 and the separation roller 25 are separated. Similarly, the corona discharger 22 and the guide plate 58 are displaced downward as shown by the imaginary lines in FIG. In this way, when the support body 35 is pulled out by the machine body 1, it becomes possible to easily pull out the copy paper that is jammed near the photosensitive drum 11.

FIG. 8 is a perspective view of a portion of another embodiment of the present invention, and FIG. 9 is a simplified longitudinal sectional view thereof.
This embodiment is similar to the previous embodiment and corresponding parts are provided with the same reference numerals. Reference numeral 90 indicates the side plate 36 and the fuselage 1 in front of the side plate 36.
This is a cover that covers the support body 35 attached to the holder, and can be opened and closed by a hinge 91.
An abutment member 93 is installed between the support side plate 40 on the front side of the support body 35 and the support side plate 41 on the back side. A front end 94 of the contact member 93 is bent upward. A support shaft 70 extending horizontally at right angles to the axis of the photosensitive drum 11 is supported on the body 1 so as to be freely angularly displaceable in the same manner as in the previous embodiment. A cam 97 having a protrusion 96 is fixed to this support shaft 70 . Spring receiver 98 fixed to support shaft 70
A spring 100 is interposed between the projecting piece 99 of the body 1, and this causes the support shaft 70 and the cam 97 to rotate around the axis of the support shaft 70 as shown by the arrow 101 in FIG. is biased clockwise. Support shaft 70
At different positions in the axial direction of the cam 97,
The cams 71, 72 shown in the previous embodiment are fixed. A contact surface 67 formed on the support member 64 of the frame body 63 can come into contact with the protrusion 73 of this cam 71, and the same applies to the other cam 72. In this embodiment, the aforementioned actuation lever 74 is unnecessary, and the other configurations are the same as in the previous embodiment.

When the support body 35 is attached to the body 1, the cam 97 is attached to the end 94 of the abutment member 93 by the spring 1.
As a result, the cam 71 (see FIG. 6) comes into contact with the contact surface 67 of the support member 64, causing the conveyance roller 21 to come into contact with the conveyance roller 20, and The separation roller 25 is in contact with the separation claw 24.

When copy paper jams near the photosensitive drum 11, pull the handle 88 and remove the paper from the support 35.
is pulled out in the direction of arrow 102. This causes the protrusion 96 of the cam 97 to abut against the lower surface 103 of the abutment member 93 from the end 94 of the abutment member 93, thereby causing the cam 97 to resist the spring force of the spring 100. The state shown at 105 is reached. Therefore cam 7
1 and 72, the contact state of the support member 64 with the contact surface 67 is released, and the support member 64 is displaced downward and comes into contact with the stopper 81. In this way, the conveyance roller 21 is separated from the conveyance roller 20, and the separation roller 25 is separated from the separation roller 24. Therefore, it becomes possible to easily pull out the jammed copy paper.

After removing the copy paper, move the support 35 to the arrow 1.
Push in the opposite direction of 02 to attach it to aircraft 1. As a result, the cam 97 is angularly displaced in the direction of the arrow 101 by the spring force of the spring 100 and returns to its original state. Therefore, the conveyance roller 21 comes into contact with the conveyance roller 20, and the separation roller 25 comes into contact with the separation roller 24. In this way, the state returns to a state where copying is possible.

As another embodiment of the present invention, hinges 77, 78
Instead, a cam or the like may be used so that the support member 65 is displaced downward in the same manner as the support member 64 in conjunction with the displacement of the actuating lever 74 in the direction of the arrow 79. In addition, in the above-mentioned embodiment, the separation roller 2
4 and the separation roller 25 are used, but in another embodiment, a pair of belts may be used instead of the separation roller 24 and the separation roller 25. A roller may be rotatably attached to the tip of the cams 71, 72, 97 so as to smoothly contact the contact surfaces 67, 93.

As described above, according to the present invention, the clamping state of the conveying means that clamps and conveys the copy paper vertically is released by pulling out the support body that supports the photosensitive drum from the machine body. To easily pull out the jammed copy paper, and to avoid accidentally damaging the outer circumferential surface of the photosensitive drum when pulling out the copy paper.

In particular, according to the present invention, since the support body is pulled out along with the photosensitive drum in the axial direction of the photosensitive drum, maintenance such as photosensitive drum replacement and toner replenishment work can be performed outside the machine, improving work efficiency. It is. In addition, since the support is pulled out together with the photosensitive drum, even if a paper jam occurs near the photosensitive drum, there is no risk that the paper will be pulled between the photosensitive drum and the conveyance means, and therefore the photosensitive drum will be removed. It is possible to prevent the paper from being damaged, and there is no fear that the paper will be torn and remain inside the machine. In this way, the jammed paper can be reliably taken out of the machine.

[Brief explanation of drawings]

FIG. 1 is an overall vertical cross-sectional view of an embodiment of the present invention;
Figure 2 shows the photosensitive drum 11 and magnetic brush developing device 1.
3 is a simplified front view of the vicinity of the photosensitive drum 11, and FIG. 4 is a simplified perspective view of the vicinity of the photosensitive drum 11 seen from the front side in the copy paper conveyance direction. Figure 5 shows the photosensitive drum 1.
6 is a front view showing in detail the rear area in the transport direction of No. 1;
The figure is a simplified sectional view taken from the cutting plane line - of Fig. 5, Fig. 7 is a simplified sectional view taken from the cutting plane line - of Fig. 6, and Fig. 8 is a simplified sectional view taken from the cutting plane line - of Fig. 6. FIG. 9, which is a perspective view of a part of the example, is a longitudinal cross-sectional view of the vicinity of the abutment member 93 shown in FIG. 8. DESCRIPTION OF SYMBOLS 1... Body, 4... Original table, 5... Exposure lamp, 11... Photosensitive drum, 12, 22... Corona discharger, 14... Magnetic brush developing device, 15...
...Cassette, 16... Copy paper, 17... Paper feed roller, 18, 19, 20, 21... Conveyance roller, 2
3... Separation claw, 24... Separation roller, 25... Separation roller, 26... Guide plate, 29... Fixing device, 3
5... Support body, 40, 41... Support side plate, 46...
...Lever, 49...Spring, 63...Frame, 64,
65... Support member, 70... Support shaft, 71, 72,
97... cam, 74... operating lever, 93... contact member.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a transfer type electrostatic copying machine in which a support for supporting a photosensitive drum etc. is removable from the machine body along the axial direction of the photosensitive drum, the transfer is performed near the photosensitive drum. At least one of the upper and lower conveyance means that pinches and conveys the paper,
A transfer type electrostatic copying machine characterized in that the support is displaced in a direction away from the other by the action of pulling out the support from the machine body, thereby releasing the mutually pinched state. . (2) At least one of the upper and lower conveyance means is displaced in a direction approaching the other of the upper and lower conveyance means and brought into pressure contact with each other by the operation of attaching the support to the aircraft body. A transfer type electrostatic copying machine according to claim 1, which is characterized by: