JPS58174983A - Dust figure transfer type electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To execute uniform cleaning without damaging the surface of a photoreceptor, by providing a means for rotating and driving the photoreceptor drawn out to the outside of the body by sliding and moving it on an extendable supporting shaft. CONSTITUTION:When taking out a photoreceptor 1 to the outside of a machine and cleaning its surface, an additional joint shaft 45 is screwed to a supporting shaft 30 of the photoreceptor 1 and the photoreceptor 1 and a cleaning device 19 formed one body with it are slided on the joint shaft 45 to be drawn out to the outside of a body 2. Subsequently, the motor is started to rotate the photoreceptor 1 at a low speed, and to clean its surface together with the supporting shaft 30, the joint shaft 45. In this case, the cleaning device 19 is not separated but is rotated underneath the photoreceptor 1 to clean it and to reduce the possibility of damaging the surface of the photoreceptor 1 remarkably, and to obtain a uniform cleaning. Since the opening of the cleaning device 19 is positioned facing upward, a toner does not spill.

Description

[Detailed Description of the Invention] Technical Section The present invention provides an image transfer 'lj: ) I, ') Shigeko photocopying machine;
Particularly, number 11← is something that is committed once every drawer of two light drums is drawn.

With the advent of modern technology, when a photoreceptor drum is used for a long period of time in a photographic reproduction machine, toner is deposited on the surface of the photoreceptor drum and a thin layer of toner is formed. # The problem is that the image quality of the copied image deteriorates due to the occurrence of filming and deterioration of the photoreceptor. Therefore, it is necessary to clean the surface of the photoreceptor drum at regular intervals to remove the thin layer of toner.

Conventionally, the photoreceptor drum has been removed from the support shaft, taken out from the copying machine body, and cleaned manually, or a coupling shaft has been attached to the support shaft, the photoreceptor drum has been pulled out to the outside of the copying machine body, and the photoreceptor drum has been manually cleaned. The surface of the photoreceptor drum was cleaned while rotating.

However, such cleaning operations tend to result in uneven cleaning, and there is a risk that the surface of the photoreceptor drum may be damaged when the photoreceptor drum is removed.

OBJECTS The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a powder image transfer type electrophotographic copying machine that can be cleaned uniformly without damaging the surface of the photosensitive drum.

In order to achieve the above objectives, the powder image transfer pattern according to the present invention is
- The Kameko photocopying machine has a photoconductor drum support shaft that can be extended to the outside of the copying machine main body, a photoconductor drum that can be pulled out to the outside of the copying machine main body by sliding with respect to this support shaft ( As mentioned above, the apparatus is equipped with a means for rotationally driving the photosensitive drum which is pulled out to the outside of the copying machine main body.The drawings of the second embodiment show one part of the powder image transfer type electrophotographic copying machine according to the present invention. An embodiment will first be described with reference to FIG. 1, in which the general structure and copying operation will be described.

The photosensitive drum (1) is installed approximately at the center of the copying machine body (2) so as to be rotatable in the direction of the arrow (a), and after a predetermined charge is applied to its surface by the charger (3). ,
The original image is continuously exposed to light with the slit facing down by an optical system 14 consisting of a projection lens (5), a mirror (6), and a light source (not shown), and an electrostatic latent image is formed. The original is stored in the copier itself (
2) Placed on the original platen (7) provided above, and placed on the original platen (7)
is at a speed A which is equal to the peripheral speed of the photoreceptor drum (1) during exposure (
(In the case of a same-size copy), the image is scanned in the direction of the arrow (b1).

The electrostatic latent image is turned into a toner image by a developing device (8) and reaches a transfer section (-).

On the other hand, the copy paper is fed one by one from the paper feed cassette 9) by the paper feed roller q, and is transported by the transport roller pair (11) to the transfer section (~, where it is discharged from the transfer charger () 21). As a result of this phenomenon, the toner image is transferred to the copy &+91.

Next, the copy paper is separated from the surface of the photoreceptor drum (1) by the AC discharge of the separation charger 031 and its own strength, and is sent to the fixing device (19) by the conveyor bell l- (141). After the toner image is heated and fixed, a pair of discharge rollers (1
6), it is discharged onto the discharge tray (171) outside the machine.

The photosensitive drum (1) is then rotated in the direction of the arrow (a), and the residual charge is erased by the eraser assembly 8), and the residual toner is removed by the blade (2 (g)) of the cleaning device 09). It is removed and prepared for the next copy.

Next, the support structure of the photoreceptor drum (1) and its cleaning operation will be explained with reference to FIG. 2 and subsequent figures.

The photoreceptor drum (1) and the cleaning device (additional unit) are integrally attached. That is, the cleaning device (19)
The side pieces (22a) and (22b) provided on the case) are connected to the boss portions (35 m
), (35b) to form a unit.The photoconductor drum) is set so as to be able to slide in the axial direction on a support shaft supported cantilevered at the back of the copying machine body (g+). In addition, the boss portions (35a) and (35b) of the photoreceptor drum 11) are provided with pins G fixed to the support shaft (3).
ll and the pin fixed to the joint shaft (c) described below (
Grooves (a6a) and (36b) through which the pins (47) can be inserted are formed, and when the photoreceptor drum (1) is set, the pins (31) are inserted into the grooves (36a) of the boss (35a).
) can rotate integrally with the support shaft (2). In addition, the cleaning device (191 is a support shaft (1), which is rotatable with respect to the photoreceptor drum (1), and when set in the copying machine main body (2), the protrusion (2 small) formed on the case 011 is attached to the copying machine. It is slidably engaged with the guide (8) provided on the main body (2), and is inserted into the main body (2) from the hole tube of the bracket mother provided on the front side piece (22b) of the case (21). By screwing the bolt (c) into the fixed nut @ (see Figure 3), it is fixed without rattling and is positioned in the axial direction.

Drive means (4■ is a motor (41) as shown in Fig. 5)
A gear (0) provided on the rotating shaft of the motor (41) is meshed with a gear (43) provided on the support shaft (to).During copying operation, a constant voltage is supplied to the motor (41) by a control circuit including a main switch. Yes, the support shaft is rotated at a relatively high speed.

- 10,000, during the cleaning described below, when the service month is turned on, the control circuit including this switch supplies the △ motor (4I) with a weight lower than the above-mentioned constant voltage, and rotates the support shaft 1dol at a relatively low speed. Drive. The serviceman switch is a maintenance-only switch installed inside the copier, and is normally not used by anyone other than service personnel.

In the above configuration, when cleaning the surface of the photoreceptor drum (1), the auxiliary stand (48) is used between the joint shafts.

That is, the threaded part (46) of the joint shaft 145) is screwed into the screw hole formed at the end on the support shaft side, and the end of the joint shaft (4ω) is inserted into the hole I49) of the auxiliary stand 148). I support it.

Next, remove the bolts and attach the photoreceptor drum (1) to the cleaning device (+!'I), the support shaft □□□, and the joint shaft (4).
9 and pull it out to the outside of the copying machine main body 12) (FIG. 3, 4 Ivl (A)). In this state, the groove (
36a), (3sa) pin 471 fixed between joint shafts
are engaged, and the photoreceptor drum ) can rotate integrally with the support shaft (1) and the joint shaft. Further, by being pulled out of the copying machine main body 12), the cleaning device 09 does not disengage from the protrusion or guide (25), and also prevents the cleaning device 09 from disengaging from the developing device (8) and the transfer charger (p etc. is the copy machine body (2)
Since it is fixed inside, it is rotatable about the joint shaft (45) as a fulcrum. Therefore, as shown in FIGS. 4(b) and 5, by rotating the cleaning device (19) below the photosensitive drum (1) and turning on the serviceman switch, the motor (41) is activated. It is activated to rotate the support shaft and the joint shaft (the photoreceptor drum as well as the center), and in this state, the surface of the photoreceptor drum (1) is cleaned.

It is preferable that the rotation speed of the photosensitive drum mountain during cleaning is relatively low; in this embodiment, the peripheral speed during copying operation is 360 mm/sec, while the peripheral speed during cleaning is 250 wn/sec. It is said to be less than sec.

Note that the groove (36b) formed in the front boss (35b) of the photoreceptor drum (1) is connected to the pin (4η) of the joint shaft (45).
It functions as an escape groove.

In addition, in this embodiment, as described above, the photosensitive drum 11) and the cleaning device (19) are integrated into a unit, and when this unit is pulled out from the copying machine main body 2), the cleaning device +t91 is rotated to expose the photosensitive drum. Since the cleaning device (19) can be attached to the lower part of the photoreceptor drum (1), the drum surface can be cleaned without separating the cleaning device (19) from the photoreceptor drum (1). Moreover, the photosensitive drum 1
When the photoreceptor drum (1) is removed from the copying machine main body (2), the cleaning device 119) functions as a stand for the photoreceptor drum (1), and the risk of damaging the drum surface is largely eliminated. The cleaning device (mQ9) is used as a stand, and when replacing the photoreceptor drum (), the opening on the cleaning device side faces upward, so toner will not spill out. It becomes unnecessary.

On the other hand, in recent years, in order to make handling easier during assembly, etc. In recent years, the optical drum and the cleaning device have been integrated into a unit. However, if the cleaning device is simply fixed to the upper part of the photoreceptor drum, even if the support shaft (■) is extended and the photoreceptor drum (1) is
), it is difficult to clean the drum surface.

Therefore, as in this embodiment, the cleaning device IItαg
It is necessary to install the photoreceptor drum (1) so as to be rotatable with respect to the photoreceptor drum (1) and to retract it from above the photoreceptor drum (1), thereby achieving the various advantages described above.

Note that the present invention is not limited to the above embodiments,
Various changes can be made within the scope of the gist. For example, instead of extending the support shaft (J) between the joint shafts, the support shaft (2) itself may have a double structure.

Also, during cleaning, the photoreceptor drum (41) is used in common with the main drive motor (41), that is, as a rotation drive means for the photoreceptor drum (41).
Switching the city pressure (corresponding to the above example), gear +4
2, +43), or alternatively, a cleaning drive motor may be installed separately from the main drive motor (41) and this motor may be rotated only during cleaning.

In this case, in the transmission path from the cleaning drive motor to the support shaft (to), there is a
It is necessary to provide a one-way Clara thousand, etc. to slip the rotation of the motor. Furthermore, a gear may be fixed to the side of the photoreceptor drum (1), and the photoreceptor drum mount may be rotationally driven via this gear without using the support shaft rigidity.

As is clear from the above description, the present invention has a photoconductor drum support shaft that is extendable to the outside of the copying machine main body, and a photoreceptor drum that can be extended to the outside of the copying machine main body by sliding and moving 1υj with respect to this support shaft. (b) The photosensitive drum that can be pulled out, and the photosensitive drum that has been pulled out of the copying machine main body as described above.
Since the photosensitive drum is equipped with a means for rotating and driving, the photosensitive drum can be pulled out along the extended support shaft for cleaning, which not only eliminates the possibility of damaging the drum surface, but also allows the photosensitive drum to be moved in the pulled out state. It is possible to clean the surface of the body drum while cleaning it, making it possible to clean evenly and evenly compared to conventional cleaning work that is done in a fixed state or without rotating it by hand. .

[Brief explanation of the drawing]

The drawings show an embodiment of the powder image transfer type Ichiko photocopying machine according to the present invention, and FIG. 1 is a schematic diagram of the overall configuration, and FIGS. 2 and 3 are perspective views showing the procedure for pulling out the photoreceptor drum. Figure, Figure 4 (
A) and (B) are front views showing the installation and retracted positions of the cleaning device, and FIG. 5 is a sectional view during cleaning. 11)...Photosensitive drum, (2)...Copier main body,
(30)...Support shaft, (40)...Driving means, (4
1)...Main drive motor, (45)...Joint shaft.

Claims (1)

[Claims] 11B; 1 A photosensitive drum support shaft that can be extended to the outside of the copying machine main body, and a photosensitive drum support shaft that can be slid relative to this support shaft, and by sliding it can be pulled out to the outside of the copying machine main body. The photoreceptor drum that can be removed is pulled out to the outside of the binaural machine body as described above! A powder image transfer type d characterized in that a means for rotationally driving the photoreceptor drum of
Child photo ~ photo shoot.