JPS6233584B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for easily and reliably attaching and detaching a sheet-like photoreceptor to and from a drum in an electrophotographic copying machine.

In electrophotographic copying machines, two typical types of photosensitive materials are used as photoreceptors, such as sheet-like selenium-based and zinc oxide-based materials, but the former selenium-based materials have poor photoconductivity and dielectric properties. Although it has excellent properties and can be used repeatedly in many image forming steps, it is extremely expensive.

On the other hand, the latter type of zinc oxide type is considerably cheaper than the selenium type, and its lifespan has also been improved. Therefore, the use of such a zinc oxide-based photoreceptor has the advantage of lowering the cost of copying machines or copying. However, compared to selenium-based products, they have to be replaced more frequently due to their longevity. In particular, for copying machines that use a photoreceptor drum with a sheet-like photoreceptor wrapped around the drum, the photoreceptor wrapped around the drum must be removed and replaced every time the photoreceptor reaches the end of its life. It is necessary to attach a suitable photoreceptor to the drum circumference. For example, if the lifespan of the zinc oxide photoreceptor is equivalent to about 500 prints, it is obvious that the photoreceptor will need to be replaced quite frequently.

In view of these points, the present invention provides a device for attaching and detaching a sheet-like photoconductor to a drum, which allows photoconductor replacement to be performed extremely easily, reliably, and in a short period of time even in situations where the photoconductor is frequently replaced. The purpose is to provide.

The present invention will be explained below with reference to illustrated embodiments.

FIG. 1 shows an example of a transfer type electrophotographic copying machine to which the present invention is applied. In the figure, a sheet-like photoreceptor S (hereinafter referred to as a photoreceptor for convenience) cut into a substantially constant length is wound around the circumferential surface of a drum 1, and its front and rear ends are located at one position on the drum circumferential surface. They are respectively clamped by clamp portions 2 provided in the. The clamp unit 2 is stopped at a steady stop position A (this will be described later) after copying has been completed, and in this state, the original is placed on the original placing table 3 and a print button (not shown) is pressed. Then, the drum 1 starts rotating in the direction of the arrow.

Next, the surface of the photoreceptor S is charged with a charger 4.
An image corresponding to the image of the document on the document table 3 moving forward in the direction of the arrow is formed on this charged surface by the light-converging imaging optical element 5, and the electrostatic potential is An image is formed. This electrostatic latent image is made visible by a developing device 6, and this visible image is transferred by a transfer charger 7 onto the surface of a transfer sheet 9 fed from a paper feed table 8. The transfer sheet 9 on which the visible image has been transferred is conveyed by a conveyor belt 11, and the transfer sheet 9 passes through a pair of fixing rollers 12, thereby fixing the transferred image on the transfer sheet. The paper is discharged to the paper tray 13.
During this time, the residual charge on the photoreceptor S wrapped around the drum circumferential surface is removed by the neutralizing charger 14, and the drum 1 rotates further and the clamp section 2 stops at the A position after having made just two revolutions. Note that, after the exposure by the light-converging imaging optical element 5 is completed, the document mounting table 3 moves back in the direction opposite to the direction of the arrow and returns to the initial position.

The copying process by the present electrophotographic copying machine is performed as described above.Next, the specific structure of the device for attaching and detaching the photoreceptor to and from the drum will be described. In FIG. 2, a photoreceptor S is wound around the circumferential surface of the drum 1 as described above, and its front end Sa and rear end Sb are clamped by a front end clamp member and a rear end clamp member, respectively, which will be described later. has been done. At one position on the circumferential surface of the drum 1, there is a V-shaped groove 1 along the axial direction of the drum, as shown in FIG.
A is formed, and this concave groove 1a is located at the part A in normal life.

A plurality of recess cuts 23 are formed in one inclined wall 1b of the groove, and a plurality of window holes 15 are bored through the window holes 15, and a tip clamp member as shown in FIG. 4 is inserted through the window holes 15. A plurality of protrusions 16a provided at the free end of the clamp 16 extend, and a clamping needle 17 is implanted in the protrusions 16a.

The base of the tip clamp member 16 is fixed to a mounting shaft 18 provided within the drum and rotatably supported by both inner end walls 1e of the drum. A driven lever 19 adjacent to the outer side of the inner end wall 1e is fixed to one end of the mounting shaft 18, and a bent piece 19a is formed at one end of this arm. As shown in FIG. 8, the driven lever 19 is given a counterclockwise rotational habit about the shaft 18 by the elasticity of the tension spring 21, and the rotation due to this habit is caused by the rotation of the protruding piece 1.
This is prevented by the bottom of 6a coming into contact with the top surface of the inclined wall 1b.

In FIGS. 3 and 4, a drum shaft 22 that is substantially integral with the drum 1 is rotatably supported by substrates on both sides (not shown), and support plates 25 are fitted to both ends of the shaft 22. It is being
The rear end clamp member 26 has a chevron-shaped support portion 26a extending along the generatrix direction of the drum, and a sliding rod portion 26b bent from both ends of the support portion 26a so as to straddle the drum. The rear end clamp member 26 is slidable in the radial direction of the drum by means of a guide hole 27 bored in its sliding rod portion 26b and a riveted shaft 28 implanted in the support plate 25. There is.

A compressible spring 32 is hung between the sliding rod portion 26b and pins 30 and 31 implanted in the support plate 25, respectively. The rear end clamp member 26 is normally in the position shown by A in FIG.
The pin 30, which has passed through the sliding rod portion 26b toward the drum due to the elasticity of the spring 32, is inserted into the bottom of the V-shaped groove 1a and is pressed against both ends thereof. As shown in FIG. 5, a thin metal pressing plate 33 is fixed to the upper surface of the support portion 26a of the rear end clamp member 26, and the pin 30 of the sliding rod portion 26b is inserted into the V-shaped groove 1.
When it is fitted into the bottom of a, it comes into pressure contact with both ends of the bottom. A plurality of clamp claws 34 bent downward at appropriate intervals are formed on the support portion 26a, and the tips of the claws 34 enter the recesses 24 provided in the other inclined wall 1c. (See Figure 8). An opening/closing control member 36 for opening and closing the tip clamp member 16 is pivotally attached to a shaft 35 implanted inside the support plate 25, and a driven lever 19 is attached to this member 36.
A cam portion 36a is formed with which the bent piece 19a engages. Further, a bent piece 36b is formed at one arm end of the control member 36, and a pin 37 for stopping a rear end clamp member 26, which will be described later, is implanted. Note that the opening/closing control member 36 has a shaft 3 in FIG.
The support plate 25 is given a habit of rotating counterclockwise around the support plate 25.
It is blocked by a pin 39 implanted in the.

In FIG. 2, a restraining lever 42 is disposed near one end of the drum 1 by a shaft 41 and pivotally connected to a side board (not shown), and one arm 42a of the lever 42 has a connecting rod 43. via solenoid 4
4 are connected. Other arm 42 of restraint lever 42
Pins 45 and 46 are implanted at each end of the arm 42b and the branch arm 42c, respectively. Note that reference numeral 47 indicates a locking member held in an immovable state for stopping the rear end clamp member 26, as will be described later.

Near the right side of the drum circumferential surface, there is a scraper member 51 pivotally connected to a side substrate (not shown) by a shaft 48.
As shown in FIG. 7, an operating arm 51a is provided at one end of the operating arm 51a.
is pressed against the pin 46 of the restraint lever 42 by the elasticity of the spring 52. A plurality of separating claws 51c are fixed to the support rod portion 51b of the scraper member 51, and are opposed to the circumferential surface of the drum. Support levers 5 located on the right side of the drum 1 in FIG. 2 and facing each other at both ends of the drum as shown in FIG.
3 (the other is not shown), and this lever 53 is pivotally mounted to a side board (not shown) by a shaft 54. One arm 53a of the support lever 53
A discharge roller 56 is mounted on the end of the other arm 53b, and the side edge of the end of the other arm 53b is pressed against a pin 59 fixed to the sliding rod 58 by the elasticity of a tight spring 57. .

The sliding rod 58 has an immovable pin 61 and a guide slot 58.
The pin 6, which is fixed to the sliding rod 58, is capable of sliding vertically by the pin 6a, and is given the habit of sliding downward by the elasticity of the tension spring 62.
3 is held in the position shown in the figure by engaging with the hook portion 64a of the hinge member 64. The hinge member 64 is pivotally connected to an apparatus board (not shown) by a shaft 65, and fixes the base of an opening/closing door 66 disposed on the side of the main body of the copying machine as shown in FIG.

Note that reference numerals 67 and 68 respectively indicate guide plates that guide the photoreceptor when the photoreceptor is fed and discharged.

Here, in FIG. 1, the copying machine in a state where copying has been completed is held in the position shown in the figure, and the clamp part 2 on the drum 1 is at the normal stop position for copying, that is, in the rotational direction of the drum. A slightly retreated from the charger 4.
stopped in position. In this state, the rear end clamp member 26 is in the position shown in FIG.
Both pins 30 of this member 26 are pressed against both bottom ends 1f of the groove 1a in FIG. 3 by the elasticity of a spring 32. As shown in FIG. 8, the tip Sa of the photoreceptor S is connected to the needle 1 of the tip clamp member 16.
The rear end Sb is clamped by the claw 34 of the rear end clamping member 26 thrusting into the rear end. The press plate 33 reinforces the clamp by having both side edges elastically pressed against the top surface of the front and rear ends. Furthermore, the scraper member 51 and the discharge roller 56 in FIG. 1 are in a state separated from the peripheral surface of the drum, and the opening/closing door 66 is in a closed state in the position shown in the figure.

Under these circumstances, when a predetermined number of transfer sheets, for example 500, have been copied to the photoreceptor S wrapped around the drum circumferential surface, a counter (not shown) issues a photoreceptor replacement command. In response to this command, for example, a replacement indicator light provided on the operation panel lights up. In response to this lighting, the second opening/closing door 66 is opened.
From the vertical position in the figure, the ninth
When released to the horizontal position shown in the figure, the tip of the hinge member 64 pushes up the pin 63 and the sliding rod 58
is slid upward against the elasticity of the spring 62. Note that the opening/closing door 58 is locked by a locking member (not shown) in a horizontally released state.

Due to the above-mentioned sliding movement of the sliding rod 58, the other arm 53b
The support lever 53, whose end side edge is in pressure contact with the pin 59, rotates counterclockwise around the shaft 54 under the elasticity of the spring 57, and the ejection roller 56 moves toward the photoreceptor S.
Pressure-contacts to the drum circumferential surface via. On the other hand, sliding rod 5
8, the protrusion 58b provided on one side edge of the sliding rod 58 in FIG. 2 turns on the micro switch MS. In response to a command signal generated by turning on this microswitch, a drum rotation drive mechanism (not shown) is operated, and this operation causes the drum 1 to rotate along with the shaft 22, which is substantially integral with the drum 1, to the second rotation drive mechanism (not shown). From the position shown in the figure, it starts rotating at the same rotational direction (arrow direction) and rotational speed as during copying, and is stopped at the position shown in FIG. That is, the clamp portion 2 on the drum is stopped at a stop position B where it faces the locking member 47 for replacing the photoreceptor. The drum is stopped at position B by disengaging the drive transmission from the rotational drive mechanism for driving the drum to the drum using a suitable clutch mechanism.

After the clamp part 2 is stopped at position B, the solenoid 44 is energized, and this energization causes the restraint lever 42 to move clockwise around the shaft 41 against the elasticity of the spring 49. Rotate. As a result, the pin 45 of the restraint lever 42 is displaced to the position shown in FIGS. Rotate clockwise against the elastic force. Then, the opening/closing control member 36
is separated from the pin 39 implanted in the support plate 25, and the cam portion 36a is separated from the bent piece 1 of the driven lever 19 that rotates together with the drum 1, as shown in FIG.
It reaches within the rotation range of 9a. Further, due to the rotational movement of the control member 36, the pin 37 of the control member 36 is moved from the position shown in FIG. 9 to the position shown in FIG.
It comes into pressure contact with the side edge of the base of the rising portion 25a.

On the other hand, due to the clockwise rotation of the restraint lever 42, the scraper member 51 in FIG.
The pin 46 of the lever 42, which had been in pressure contact with the operating arm 51a, is separated from the operating arm 51a, and at this time, the scraper member 51 is rotated counterclockwise around the shaft 48 by the elasticity of the spring 52, as shown in No. 10. The separating claw 51c (see FIG. 7) comes into pressure contact with the circumferential surface of the drum via the photoreceptor S. From this state, that is, from the state shown in FIGS. 10 and 11, the drum 1 starts rotating in the direction of the arrow again, and the driven lever 19 also rotates integrally with the drum 1. . On the other hand, in FIG. 12, the support plate 25 fitted on the shaft 22 and the opening/closing control member 36 pivotally connected thereto by the shaft 35 are
5, the drum 1 remains stationary at the position shown in the figure regardless of rotation of the drum 1.

On the other hand, as the drum 1 rotates, the pins 30 of the rear end clamp member 26 located at both ends of the bottom of the V-shaped groove
(See FIG. 3) rides on both ends of one inclined wall 1b of the groove against the elasticity of the spring 32.
Along with this, the rear end clamp member 26 slides toward the locking member 47 in the drum radial direction while being guided by the riveted shaft 28 . That is, the clamp member 26
It is displaced from the figure to the position shown in FIG. 12, and during this time, as shown in FIG. 11, the claw 34 stuck to the rear end Sb of the photoconductor is separated from the rear end as shown in FIG. The clamped state of the rear end Sb of the photoreceptor is released.

Furthermore, the drum 1 continues to rotate, and the pin 3
0 is the circumferential rail 1 on both sides of the drum as shown in FIG.
d (see FIG. 3), the pin 30 engages with the recess 47a of the locking member 47. and,
The support plate 25, the opening/closing control member 36, the rear end clamp member 26, etc. are maintained in a stopped state, whereas the drum 1 is moved by the driven lever 1 as shown in FIG.
It continues to rotate integrally with 9 in the direction of the arrow. In this state, the tip Sa of the photoreceptor S is still clamped by the tip clamp member 16.

When the drum 1 rotates continuously from the position shown in FIG. 13 to FIG. 14 and reaches the position shown in FIG. 15,
Driven lever 1 that was rotating integrally with the drum
The inner edge of the bent piece 19a of No. 9 is connected to the oblique side edge 36c of the cam portion 36a of the opening/closing control member 36 in the rest position.
It hits me. When the drum further rotates, the bent piece 19a rides on the cam edge of the cam portion 36a as shown in FIG.
9 resists the elasticity of the spring 21 and moves to the first position in FIG.
Rotate clockwise about the shaft 18 to the position shown in FIG. As a result of this rotation, the tip clamp member 16 whose base is fixed to the shaft 18 also rotates clockwise, and at this time, the needle 17 stuck to the tip Sa of the photoreceptor is separated from the tip Sa. In this state, the clamped state of the tip Sa of the photoreceptor is released as shown in FIG.

During this time, as shown in FIG. 15, the plurality of separating claws 51c of the scraper member 51, which is in pressure contact with the drum circumferential surface due to the elasticity of the spring 52, moves toward the tip of the separating claws 51c as the groove 1a approaches. gradually enters the concave groove 1a, and as shown in FIG. 17, its tip end forms a concave cut 23 (see FIG. 3)
It hits the bottom of the. During this time, the tip of the photoreceptor S
Sa is guided to the upper surface of the separating claw 51c and is completely separated from the tip clamp portion.

On the other hand, as the drum 1 continues to rotate,
The bottom of the recessed cut 23 pushes the separating claw 51c and moves the scraper member 51 around the shaft 48 with the spring 5.
Rotate clockwise against the elasticity of step 2. Then, as shown in FIG. 18, the separating claw 51c comes into pressure contact with the drum circumferential surface again, and during this time, the ejection roller 56 which comes into pressure contact with the drum circumferential surface via the photoreceptor S due to the elasticity of the spring 57 (see FIG. 9) rotates in the direction of the arrow as the drum rotates, and due to this rotational action and the guiding action of the separating claw 51c, the tip of the photoreceptor S
Sa moves toward the guide plate 67.

When the drum 1 further rotates from the position shown in FIG. 18 to the position shown in FIG. The pin 30 of
Due to the elasticity of the spring 32, it falls again to both ends of the bottom of the groove 1a. As a result, the rear end Sb of the photoreceptor S is clamped again by the rear end clamp member 26, but since the drum 1 continues to rotate continuously, as shown in FIG. 3
0 rides on the circumferential rail 1d at both ends of the drum again and releases the rear end Sb of the photoreceptor again.

In FIG. 20, the pin 30 is connected to the circumferential rail 1d.
After the solenoid 44 rides on and engages with the recess 47a of the locking member 47, the excitation state of the solenoid 44 is released.
2 from FIG. 10 under the elasticity of the spring 49.
Rotate counterclockwise to the original position shown in Figure 0. As a result, the pin 45 of the lever 42 is displaced from the position shown in FIG. 10 to FIG. 20, and the restraining operation on the opening/closing control member 36 is released. Along with this, the control member 36 is rotated counterclockwise around the shaft 35 by the elasticity of the spring 38, and the control member 36 is rotated counterclockwise around the shaft 35.
In the figure, it is locked by a pin 39.
That is, the cam portion 36a of the control member 36 is retracted from the rotation range of the bent piece 19a of the driven lever 19. Further, due to the rotational movement of the restraining lever 42 in the counterclockwise direction, the pin 46 of the lever 42 is displaced from the position shown in FIG. 18 to FIG.
The separating claw 51c is separated from the drum surface by rotating clockwise around the drum surface.

Now, when the drum 1 rotates from the position shown in FIG. 19 to FIG. 20 to the position shown in FIG. The drum 1 falls to both ends of the bottom, and the drum 1 stops in this state. While this drum 1 rotates, the opening/closing control member 3 shown in FIG.
The cam portion 36a of No. 6 is the bent piece 19a of the driven member 19.
Since the cam part 36a and the bent piece 19a do not engage with each other,
Therefore, the distal end clamp member 16 is not released again. Note that this point will be discussed later. By the way, as shown in FIG. 20, the used photoreceptor S with its rear end Sb released is guided by the upper surface of the separation claw 51c and moves toward the discharge direction, and then passes through the opening/closing door 66 shown in FIG. is discharged out of the machine along the top surface of the machine. In other words, the used photoreceptor has been discarded.

As described above, the photoreceptor S wrapped around the drum circumferential surface is ejected from the drum, but next,
We will describe a new method for wrapping the photoreceptor around the drum surface. That is, the clamp portion 2 of the drum 1 is in a stopped state at a stop position B for replacing the photoreceptor, as shown in FIG. That is, it is in a plate feeding standby state. Further, each movable element is in the position shown in FIG. 9, and the movements of the movable elements during plate feeding are exactly the same as during plate discharging. Therefore, as shown in FIG. 22, a new photoreceptor S is inserted along the upper surface of the opening/closing door 66 (see FIG. 9) and the guide plate 67, and the tip of the photoreceptor S is
hit against the circumferential surface of drum 1. Then, by pressing a plate ejection command button (not shown) or by a detection means for detecting the tip Sa of the photoreceptor, the ninth
Solenoid 44 in the figure is energized. Then, in the same way as the above-mentioned operation, the restraint lever 42 rotates clockwise, and as shown in FIG.
Rotate clockwise around.

That is, the cam portion 36a of the opening/closing control member 36 is
As shown in FIG. 1, the bent piece 19a of the driven lever 19
reaches within the rotation range. When the drum 1 rotates to the position shown in FIG. 16, the tip clamp member 16 changes from the closed state to the released state.
When the drum 1 has further rotated and reached the position shown in FIG. and the inclined wall 1b. When the drum 1 further rotates from this state and reaches the position shown in FIG. The needle 17 is inserted and the tip Sa is clamped.

After the front end of the photoreceptor is clamped by the front end clamp member 16, the pins 30 of the rear end clamp member 26 shown in FIG. 24 fall into both ends of the bottom of the V-shaped groove 1a as shown in FIG. 25. When the pin 30 rides on the circumferential rail 1d of the drum from both ends of the bottom as shown in FIG.
passes the stop position B for replacing the photoreceptor, the solenoid 44 is deenergized, and as a result,
The opening/closing control member 36 rotates counterclockwise around the shaft 35 until it comes into contact with the pin 39. Therefore, the second
In FIG. 0, the cam portion 36a of the control member 36 is retracted from within the rotation range of the bent piece 19a of the driven lever 19. Therefore, while the drum 1 rotates from the position shown in FIG. 25 to FIG. There is no problem in that the tip clamping member 16 that has clamped the tip Sa is opened again.

The drum 1 is moved from the plate feeding standby position shown in FIG.
As the drum rotates, the pin 30 falls into both ends of the bottom of the groove as shown in FIG. 25, and as the drum further rotates, it passes through the positions shown in FIGS. 26 and 27, and in the second rotation, the pin 30 falls into the position shown in FIG. As shown, the photoreceptor falls to both ends of the bottom again, but at this time, the rear end Sb of the photoreceptor is pressed against the pressing plate 33 of the rear end clamp member 26.
However, since the photoreceptor falls toward the bottom of the groove while being pressed against the wall surface of the groove, the pressure plate 33 at this time
This means that it is clamped while being subjected to tension due to the movement of. In addition, in FIG. 28, the rear end of the photoreceptor
After Sb is clamped, while performing this clamping operation, the drum 1 is integrally moved from the position in the figure with the driven lever 19, the rear end clamp member 26 that has been in a stopped state, and the opening/closing control member 36. It rotates to the position shown in Figure 2 and stops at the same position.

That is, the clamp section 2 on the drum stops at a regular stop position A for copying. In this state, when the opening/closing door 66, which has been opened horizontally as shown in FIG. 9, is closed in a vertical position as shown in FIG. Then, it slides downward, and at this time, the sliding rod 58
The pin 59 contacts the other arm 53b of the support lever 53 and pushes the arm 53b to move the support lever 5.
3 in a clockwise direction around the shaft 54. Therefore, the discharge roller 56 is separated from the drum circumferential surface. In this state, all the movable elements return to their original positions shown in FIG. In this way, a new photoreceptor is wrapped around the drum circumferential surface, and in this state, the next copy can be started immediately.

As is clear from the above description, according to the present invention, when replacing the sheet-like photoreceptor with respect to the drum, especially when feeding the plate, the sheet-like photoreceptor whose tip is clamped rotates together with the drum. When the rear end is clamped, the rear end pressing member provided on the rear end clamp member presses the sheet-like photoreceptor against the V-shaped recessed part, which is the clamp part of the drum, and presses the sheet-like photoreceptor inside the recessed part. , the rear end of the sheet-like photoreceptor can be pulled and squeezed, and the sheet-like photoreceptor can be clamped onto the drum without any wrinkles or sagging that may occur therein.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a transfer type electrophotographic copying machine to which the present invention is applied, FIG. 2 is a front view showing the original state of the photoreceptor attaching/detaching device according to the embodiment of the present invention, and FIG. FIG. 4 is an exploded perspective view showing the opening/closing mechanism of the front and rear end clamp members attached to the drum; FIG. 5 is a front sectional view showing the main parts of the rear end clamp member; Figure 6 is a perspective view showing how the ejection roller is attached to the support lever, Figure 7 is a perspective view of the scraper member, and Figure 8 shows how the front and rear ends of the photoreceptor are clamped to the drum in its original position. 9 is a front view of the main part of the drum shown in FIG. 2. FIG. 9 is a front view of the drum in the photoconductor attachment/detachment device shown in FIG. A front view of the main part of the photoconductor attachment/detachment device in which the solenoid is energized to stop the position at the above-mentioned stop position, and FIG. 11 is a front view of the drum showing the state of clamping the front and rear ends of the photoconductor in the clamp section stopped at the above-mentioned stop position. Fig. 12 is a front view of the drum showing the drum starting to rotate from the position shown in Fig. 11, and Fig. 13 is a front view of the drum showing the state in which the pin of the rear end clamp member rides on the circumferential rail of the drum. ,
FIG. 14 is a front view of the drum showing a state in which the drum has been further rotated from the position shown in FIG. Fig. 16 is a front view of the main part of the photoconductor attachment/detaching device with the tip clamp member released, and Fig. 17 is a main part of the photoconductor attachment/detachment device showing the state where the tip of the photoconductor is separated by the scraper member. 18 is a front view of the main part of the photoconductor attaching/detaching device showing the manner in which the photoconductor is guided along the upper surface of the separation claw of the scraper member, and FIG. 19 is a front view of the drum from the position shown in FIG. 9. FIG. 20 is a front view of the main part of the photoreceptor attachment/detachment device showing how the pin of the rear end clamp member has fallen into the bottom of the concave groove of the drum after one rotation, and the drum has rotated slightly from the position shown in FIG. 19. FIG. 21 is a front view of the principal part of the photoconductor attachment/detaching device showing the state in which the pin rides on the drum circumferential rail from the bottom of the concave groove, and FIG. A front view of the main part of the photoconductor attaching/detaching device showing the photoconductor being ejected as the photoconductor falls into the bottom of the concave groove, and Figure 22 shows the state in which the tip of the photoconductor is in contact with the drum circumferential surface during plate feeding. FIG. 23 is a front view of the main parts of the photoconductor attachment/detaching device, showing a mode in which the tip of the photoconductor has entered between the tip clamp member in the released state and the inclined wall of the concave groove of the drum. FIG. 24 is a front view of the main part of the photoconductor attaching/detaching device showing a situation where the tip of the photoconductor is clamped;
FIG. 25 is a front view of the main part of the drum showing the state in which the pin of the rear end clamping member in FIG. Fig. 27 is a front view of the main part of the drum showing the state immediately before the rear end of the photoreceptor is clamped, and Fig. 28 shows the state where both the front and rear ends of the photoreceptor are clamped. FIG. 3 is a front view of main parts of the photoconductor attachment/detachment device. DESCRIPTION OF SYMBOLS 1...Drum, 2...Clamp part, 16...Tip clamp member, 26...Rear end clamp member, 3
6... Opening/closing control member, 47... Locking member.

Claims (1)

[Scope of Claims] 1. In an electrophotographic copying machine using a sheet-like photoreceptor wrapped around a drum circumferential surface, an electrophotographic copying machine provided at one position on the drum circumferential surface for clamping the front and rear ends of the sheet-like photoreceptor. a clamp section consisting of a substantially V-shaped recessed fitting section; a distal end clamp member provided on the clamp section; a support section along the generatrix of the drum; The sliding rod part has a curved sliding rod part, and the supporting part has a rear end pressing member for pressing the rear end of the sheet-like photoreceptor, and the sliding rod part has a rear end pressing member that presses the rear end of the sheet-like photoreceptor. Each pin is provided with a pin that comes into contact with the peripheral edge of the drum including the recessed fitting part, and during copying, the pin is located in the clamp part and rotates integrally with the drum, and when replacing the sheet-like photoconductor, the pin is placed in the clamp part and rotates integrally with the drum. a rear end that is attached to the drum so as to be movable independently of the tip clamp member, is slidable in the radial direction of the drum, and has a tendency to move in the direction of pressing against the circumferential surface of the drum; a clamp member, and a rear end clamp on the drum that is rotated to displace the clamp part, which is normally at a steady stop position for copying, to a stop position for replacing the sheet-like photoreceptor. Stopping the member at a stop position for replacing the sheet-like photoreceptor, releasing the rear end clamping state of the photoreceptor by the rear end clamping member when discharging the plate, and clamping the rear end of the photoreceptor when feeding the plate. and an opening/closing control member for opening and closing a leading end clamping member to release the clamped state of the leading end of the photoreceptor in conjunction with the rotation of the drum at the time of plate discharge and to clamp the leading end at the time of plate feeding, During plate feeding of the sheet-like photoreceptor, the pin that is in contact with the peripheral edge of the drum falls into the clamp section, and the rear end pressing member is displaced to the clamp section, causing the sheet-like photoreceptor to be loaded. A device for attaching and detaching a sheet-like photoconductor to a drum, characterized by squeezing the rear end of the photoconductor.