JPS6017474A - Electrostatic copying device - Google Patents

Abstract

PURPOSE:To remove quickly and easily jammed transfer paper, and also to set precisely an interval between a photosensitive body and a developing sleeve by providing a rotary drum freely attachably and detachably in a prescribed direction, and a developing device freely turnably respectively. CONSTITUTION:A rotary drum 14 having a photosensitive body on the surface is mounted vertically to a revolving center axis and freely detachable in the direction toward a developing device 20. On the other hand, the developing device 20 is mounted freely turnably and can be turned clockwise by the own weight of the developing device. Therefore, a spacer ring provided on the developing device is made to contact with the surface of the drum 14. Accordingly, the jammed transfer paper can be removed quickly and easily by moving the drum 14 to the right against deviating force by the own weight of the developing device 20. Also, the interval between the photosentivie body and a developing sleeve can be set precisely by the spacer ring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electrostatic copying apparatus, more specifically, a rotating drum is rotatably disposed at a predetermined position within the electrostatic copying apparatus, and a developing device is provided adjacent to the rotating drum. The present invention relates to an improvement in the mounting system of a rotating drum and a developing device in an electrostatic copying machine of the type in which the device is installed.

As is well known to those skilled in the art, in recent years, so-called toner image transfer type electrostatic copying apparatuses have been widely put into practical use. In such an electrostatographic apparatus, a rotating drum having a photoreceptor on its surface is rotatably disposed in a predetermined position within the electrostatographic apparatus housing, and still absorbs the electrostatic potential formed on the photoreceptor. A developer device for developing the image into a toner image is disposed within the electrostatographic housing adjacent the rotating drum.

However, in the conventional electrostatic copying apparatus of the form described above,
There are problems to be solved as follows.

As is well known to those skilled in the art, it is possible to easily remove transfer paper jams that occur around the rotating drum, and also to allow the photoreceptor to be replaced or cleaned if necessary. Therefore, it is necessary that the rotating drum having the photoreceptor on its surface be rotatably mounted at a predetermined position within the housing song and also detachably mounted. Therefore, conventional electrostatic copying apparatuses are configured so that the rotary drum can be attached and detached by moving it in the direction of its rotation center axis. However, in such a conventional configuration, if a transfer paper jam occurs on the circumferential surface of the rotating drum, the rotating drum must be moved in the direction of its central axis of rotation to free it. In this way, the rotary drum is not moved relative to the jammed transfer paper while the jammed transfer paper remains in contact with the photoreceptor on the surface of the rotary drum. When the ram is silently removed, the jammed transfer paper may rub against the surface of the photoreceptor, causing damage or deterioration of the photoreceptor.In addition, the transfer paper may rub against the surface of the rotating drum. When a paper jam occurs, in order to remove the jammed transfer paper, it is generally necessary to move the entire rotating drum out of the housing. is complicated.

Furthermore, the developing device includes a hollow cylindrical developing sleeve extending substantially parallel to the central axis of rotation of the rotating drum, a rolled magnet member disposed within the developing sleeve, and a peripheral surface of the developing sleeve. A type of developing device equipped with a developer supply device for supplying developer is preferably used, but when using such a type of developing device, as is well known to those skilled in the art, in particular, When the developer is a so-called component-based developer consisting only of magnetic toner particles, in order to achieve the desired development with good permeability, the photoreceptor provided on the surface of the rotating drum and the surface of the developing sleeve must It is important to set the spacing very precisely. However, in conventional electrostatic copying machines, it is necessary to use a relatively complicated and expensive mechanism to enable the above-mentioned spacing to be set precisely, and the spacing setting operation is also complicated. Ta.

The present invention has been made in view of the above-mentioned facts, and its main purpose is to solve the above-mentioned problems existing in conventional electrostatic copying machines, and to eliminate the need to move the rotating drum in the direction of its central axis of rotation. can be mounted and removed, and therefore there is no risk of damage or deterioration of the photoreceptor surface due to moving the rotating drum in the direction of its central axis of rotation; When a paper jam occurs, the jammed transfer paper can be removed without the need to move the entire rotating drum out of the housing. Furthermore, the spacing between the surface of the hollow cylindrical developing sleeve used in the developing device and the photoreceptor provided on the surface of the rotating drum requires a complicated and expensive mechanism. It is an object of the present invention to provide an electrostatic copying apparatus that can be easily and quickly and precisely set without any problems.

According to the present invention, a rotating drum having a photoreceptor on its surface is rotatably disposed at a predetermined position within an electrostatic copying device housing, and develops an electrostatic latent image formed on the photoreceptor. A developing device is disposed within the housing song adjacent to the rotating drum, and the developing device includes a hollow cylindrical developing sleeve extending substantially parallel to the central axis of rotation of the rotating drum. a roll-shaped magnet member disposed within the developing sleeve; a roll-shaped magnet member disposed coaxially and rotatably with the developing sleeve adjacent to each side end of the developing sleeve; a pair of spacer rings having an outer diameter larger than that by a predetermined dimension, a developer supply device for supplying developer to the circumferential surface of the developing sleeve, the developing sleeve, the magnetic member, and the pair of spacer rings. and a support frame for supporting the developer supply device; wherein the rotating drum is arranged substantially perpendicular to its central axis of rotation and in a direction toward the developing device. The support frame of the developing device is rotatably mounted at a predetermined position within the housing, and the developing device is supported by the weight of the developing device itself or by the biasing action of a suitable elastic means. The entire device is forced toward the rotating drum so that each of the pair of spacer rings comes into contact with the surface of the rotating drum, and the pair of spacer rings reduces the distance between the photoreceptor and the surface of the developing sleeve. is set to a predetermined value, and the rotating drum is prevented from detaching.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific example of an image transfer type electrostatic copying apparatus constructed in accordance with the present invention will be described in more detail with reference to the accompanying drawings.

First, the overall structure of the illustrated electrostatic copying apparatus will be outlined with reference to FIGS. 1 and 2. FIG.

The illustrated electrostatic imaging device has a substantially rectangular parallelepiped-shaped housing (i), which is indicated by the number 2 as a whole. A document mounting mechanism 4 for holding a document to be copied is disposed on the upper surface of the housing 2 . The document placement mechanism 4 in the illustrated example includes a support frame 6 mounted movably in the document scanning direction (that is, in the left-right direction in FIGS. 1 and 2) by an appropriate method, and a support frame 6 fixed to the support frame 6. The transparent plate 8 on which the original to be copied is placed, and the piece P (upper edge in FIG. 1) connected to the support frame 6, covering the original placed on the transparent plate 8 ( 1 and 2), and during the copying process, it is driven by an appropriate drive means (not shown) as shown in FIGS. 1 and 2. In FIG. 2, it can be moved appropriately in the left-right direction. Further, a control panel 12 in which control switches and the like are arranged is arranged on the front side of the housing 2.

As shown in FIG. 2, a cylindrical rotating drum 14 having a photoreceptor on at least a part of its outer circumferential surface is located approximately at the center of the blowfish 2, as will be explained in detail later. Depending on the method, it is attached rotatably and detachably. Rotating drum 14 driven to rotate in the direction of arrow 16
Surrounded by a charging corona discharger 18 for charging the photoreceptor, and a developer for applying toner particles to the electrostatic latent image formed on the photoreceptor to make it a visible image, are sequentially arranged around the photoreceptor along the direction of rotation. a developing (and cleaning) device 20, which constitutes means and in the illustrated embodiment also cleaning means for removing residual toner particles remaining on the photoreceptor after the transfer step; Regarding 20,
(Explained in detail later) A transfer corona discharger 22 for transferring the developed image formed on the photoreceptor to transfer paper, and a static elimination lamp for removing residual charges remaining on the photoreceptor after the transfer process. 24 are arranged.

An optical system 26 is arranged above the rotating drum 14 for projecting an image of the original held by the original placing mechanism 4 onto the photoreceptor. The optical system 26 includes an original irradiation lamp 30 that irradiates the original through an exposure aperture 28 formed on the upper surface of the housing 2, a first reflecting mirror 32 that projects reflected light from the original onto the photoreceptor, and an in-mirror lens. 34, a second reflecting mirror 36, and a third reflecting mirror 38. The power optical system 26 looks at the image of the document held on the document placement mechanism 4 in the direction of rotation of the rotary drum 14, as shown by the broken line arrow in FIG. The image is projected onto the photoreceptor at a position immediately downstream of the image.

The illustrated electrostatographic reproduction apparatus is further provided with a copy paper transport system, designated generally by the numeral 50. This copy paper conveyance system 50
A paper feed cassette 52 whose tip end is partially inserted into the housing 2 through an insertion opening formed in the right end wall of the housing 2, and a sheet of transfer paper stored in the cassette 52. A supply roller 54 for feeding out the transfer paper one by one, and a pair of conveyance rollers 58 for carrying the transfer paper fed out by the supply roller 54 through a pair of guide plates 56 to the transfer area where the corona discharger 22 for transfer is arranged. , a pair of separating rollers 60 for separating the transfer paper that is brought into close contact with the surface of the rotating drum 14 from the rotating drum 14 in the transfer area and carrying it out from the transfer area; a transfer paper that is sent from the separating roller pair 60 over the guide plate 62; a pair of pressure rollers 64 for pressurizing and fixing the developed image transferred onto the transfer paper; and a receiving tray 6 for receiving the transfer paper fed from the pair of pressure rollers 64.
It consists of 6.

Next, a method of mounting the rotating drum 14 will be described with reference to FIGS. 3 to 5.

Referring to Section 3, in the specific example shown in the drawings, the housing 2 (see FIGS. 1 and 2) includes a A pair of internal side plates 68cL and 68b are disposed at a predetermined distance in the direction (direction). Then, at a predetermined position on the inner surface of each of the side plates 68α and 68b,
Guide and support member 7 used for mounting the rotating drum 14
2α and 72b are installed.

Before describing the structure of the guide and support members 72α and 726 in detail, the structure of the rotating drum 4 will be explained with reference to FIG. 4 together with FIG. Consisting of relatively small-diameter bearing members 78 (only one of which is shown in the drawing) disposed at both ends of the shaft 76, and a drum member 80 fixed to the shaft 76 between the bearing members 78. has been done. A photoreceptor 82 made of a suitable material is disposed on the main surface of the drum member 80 . An annular groove 84 having a diameter somewhat smaller than the outer diameter of the photoreceptor 82 is present on the outside of both ends of the photoreceptor 82 of the drum member 8o. There is a non-photosensitive region 86 that preferably has an outer diameter that is substantially the same as the outer diameter of photoreceptor 82 . The pair of annular grooves 84 are provided with a transfer paper that is brought into contact with the surface of the photoreceptor 82 for the purpose of image transfer (the transfer paper has a width somewhat larger than the width of the photoreceptor 82, and both edges thereof are annular). The tip of a peeling claw (not shown), which is well known to those skilled in the art, is positioned to ensure that the photoreceptor 82 (located at groove 840) is removed from the surface of photoreceptor 82 after transfer. Further, in the pair of non-photosensitive areas 86, as will be explained in detail later, a pair of spacer rings are provided for setting the distance between the surface of the developing sleeve of the developing device 20 and the photoreceptor 82 to a predetermined value. be brought into contact. Further, the illustrated rotating drum 14 has a photoreceptor 82 near its negative end (that is, between one end of the drum member 80 and one bearing member).
and a gear 88 which preferably has an outer diameter somewhat smaller than the outer diameter of the non-photosensitive area 86. A gear 88, which rotates together with the shaft 76 and the drum assembly 80, is connected to a drive source via a suitable gear mechanism (not shown) when the rotating drum 14 is installed in a predetermined position. 14 is rotationally driven in the direction shown by arrow 16 in FIG.

Next, the structure of the pair of guide and support members 72α and 72b will be described with reference to FIG. It has shaft support holes 90α and 90b for receiving each of the disposed bearing members 78. The shaft support holes 90α and 90b are opened in an appropriate direction substantially perpendicular to the central axis of rotation of the rotating drum 14 (in the illustrated case, on the right side in FIG. 2 and in a substantially horizontal direction). It is important to have cutouts 92a and 92b that are similar to each other. Each of the guide and support members 72α and 72b is further provided with the shaft support hole 90 (the notch 92 of Z and 90b).
(Continuing to Z and 92b, it extends in a direction substantially perpendicular to the rotation center axis of the rotating drum 14, and
4 is heavily mounted, guide surfaces are provided to guide appropriate parts on both sides of the rotating drum 14 when the rotary drum 14 is mounted.

In the illustrated embodiment, such guide surfaces are defined by the upper surfaces of the parts forming the guide and support parts 72a and 72bf, and are defined by the lower ends of the notches 92α and 92b of the pivot holes 90α and 90b. first guide surfaces 94σ and 94b that extend substantially horizontally (or somewhat upwardly) and then somewhat inclined toward the lower blade, and inside such first guide surfaces 94α and 94b and @ The first guide surfaces 94α and 94b are also comprised of second guide surfaces 96α and 96b that extend downward substantially horizontally, then extend slightly upwardly at an angle, and further extend substantially horizontally. Each of the guide and support members 72α and T2b further includes the shaft support holes 90α and 90.
A circular position on the outer surface corresponding to the position b is a protrusion 98.
Preferably, a and 98b are provided.

The passage guide and support members 72a and 72b are positioned by inserting the protrusions 98α and 98b into circular openings formed at predetermined positions of the side plates 68 (+ and 68b),
In this way, the positions of the shaft support holes 9Qtz and 90b are adjusted to the side plate 6.
8α and 68b, and then tighten the setscrew 100 on the arithmetic side to the side plates 68α and 68b.
The guide and support member T2 passes through the through hole formed in 8b.
By screwing into a and 726, the side plate 68α
and 68b at a predetermined position on the inner surface.

The rotating drum 14 is attached to the guide and support members 727Z and 72b in the following manner.

Referring to FIG. 2 as well as FIGS. 3 to 5, when installing the rotating drum 14, the developing device 20 (to be described in detail later), the right end wall 102 of the housing 2 (see FIG. and Fig. 2) have not yet been installed in the predetermined position and need to be removed. In such a state, the rotating drum 14 is first inserted into the No-Uji Fugu 2 through the opening that will later be closed by the right end wall 102, that is, the right end opening of the housing 2, and the rotating drum 14
Each of the pair of non-photosensitive areas 86 near both ends of is placed on each end of the second guide surfaces 96a and 96b of the guide and support members 72α and 72b. Next, the rotary drum 14 is inserted into the support hole 9 along the second guide surfaces 96α and 96b.
0α and 90b (ie, to the left in FIG. 2). That is, by rotating the rotary drum 14 on the second guide surfaces 96α and 96b,
move it towards. During such movement, the rotating drum 1
40 at one end (FIGS. 3 and 5), not only the non-photosensitive area 86 but also the gear 88 are located on the second guide surface 96b (therefore, in the illustrated embodiment, the guide and support The width of the second guide surface 96b of the member 72b is also wider than the width of the second guide surface 96α of the other guide and support member 72α by the width of the gear 88).

However, since the outer diameter of the gear 88 is also somewhat smaller than the outer diameter of the non-photosensitive area 86 described above, the gear 88 does not come into contact with the second guide surface 96b.

When the rotating drum 14 is moved by a predetermined amount along the second guide surfaces 96α and 9'6b, each of the bearing members 78 disposed at both ends of the rotating drum 14 moves along the guide and support members 72α and 9'6b. 2b are located on each of the first guide surfaces 94α and 94b. After that,
The bearing member 78 is caused to rotate on the first guide surfaces 94a and 94b, and the first guide surfaces 94a and 94a
4b, the rotating drum 14 is further provided with pivot holes 90a and 9.
0b, the non-photosensitive area 86 of the rotating drum 14 separates from the second guide surfaces 96α and 96b, and the bearing part 78 is positioned in the pivot holes 90a and 90b through the notches 92α and 92b. Thus, the rotating drum 14 is rotatably and removably attached to the shaft support holes 90α and 90b via the bearing members 78 provided at both ends thereof. The removal of the rotating drum 14 from the shaft support holes 90a and 90b is as explained in detail later.
The developing device M2 is mounted subsequent to the mounting of the rotating drum 14.
0 spacer ring is the non-photosensitive area 86 of the rotating drum 14.
This is prevented by abutting the rotary drum 14 in the shaft support holes 90α and 90b.

Note that the guide surfaces (first
The guide surfaces 94a and 94b and the second guide surfaces 96α and 96b) are not twisted as shown in the figure, and may guide the rotating drum 14 to the required passage through the shaft support holes 90α and 90b. When moving the rotary drum 14 along the guide surface, various components already installed in the housing 2 (for example, a feeder located below the rotary drum mounting position) can be moved in any form. roller 54, guide plate pair 56, conveyance roller pair 58, etc.) and the rotating drum 14.
It is important that the rotary drum 14 is arranged so as to guide the rotating drum 14 without causing collisions. Furthermore, if the photosensitive area of the rotating drum 14, that is, the surface of the photosensitive member 82 comes into contact with the guide surface, the photosensitive member 82 may be damaged. It is preferable that both ends of the drum 140 are in contact with a guide surface and guided.

In an electrostatic copying apparatus in which the rotating drum 14 is mounted in the manner described above, if paper jam occurs on the circumferential surface of the rotating drum 14, the guide and support member 72
By moving the rotary drum 14 by the required amount to the right in FIG. 2 along the α and 7260 guide surfaces, the jammed transfer paper can be easily removed. Rotating drum 14
The direction of movement is not in the direction of the central axis of rotation, but in a direction perpendicular to this, so that the jammed transfer paper does not rub against the surface of the photoreceptor 820 when the rotating drum 14 moves. Therefore, there is no possibility that the surface of the photoreceptor 82 will be damaged or deteriorated. In addition, since the moving direction of the rotating drum 14 is perpendicular to the rotation axis, the rotating drum 14 can be moved only by the required amount without completely moving outside the How Song 2, and the transfer paper packed with paper can be removed. This makes it easy to remove jammed transfer paper.

Structure and Mounting Method of Developing Device Next, the structure and mounting method of the developing device 20 will be described with reference to FIGS. 6 to 8 as well as FIGS. 1 and 2.

First, the configuration of the developing device 20 will be described. The illustrated developing device 20 has a support frame 106 whose front surface (that is, the surface facing the rotating drum 14) is open. A support shaft 108 extending substantially parallel to the center axis of rotation of the rotary drum 140 is fixed near the lower front surface of the support frame 106 . A hollow cylindrical developing sleeve 110 and a roll-shaped magnet member 112 are attached to this support shaft 108. In the illustrated example, the rotating drum 1
A developing sleeve 110 is rotatably mounted on the support shaft 108, while a developing sleeve 110, which extends substantially parallel to the central axis of rotation of the rotary drum 14 and close to the circumferential surface of the rotary drum 14, is rotatably mounted on the support shaft 108; The positioned magnet member 112 is fixed to a support shaft 1084. Furthermore, support #J108
, a pair of spacer rings 114 (FIG. 8) are in momentary contact with each of the opposite ends of the developing sleeve 110.
10 so that it can freely rotate independently. Such a spacer cylinder 114 is connected to the developing sleeve 1.
It is important to have an outer diameter that is a predetermined dimension larger than the outer diameter of 10. A gear 116 is connected to one end of the developing sleeve 110 shown in FIG.
Gear 1 engaged with gear 116 connected to 10
18, and the gear 1 that rotates integrally with this gear 118.
20 is rotatably attached. When the developing device 20 is installed in the No-Uji Fugu 2 as required in a manner described later, the gear 120 is connected to the gear 88 (see FIGS. 3 and 3) disposed at one end of the rotating drum 140. 4) and therefore the gear 88.120.118
The rotation of the rotary drum 14 is transmitted to the developing sleeve 110 via 116 and 116, and thus the developing sleeve 110 is rotated in the direction indicated by an arrow 122. In the illustrated developing device, the developing sleeve 110 is rotated, but as is well known to those skilled in the art, the magnetic member 112 may be used instead of the developing sleeve 110, or both the developing sleeve 110 and the magnetic member 112 may be rotated in a desired direction. It can also be made to rotate.

The developing device 20 further includes a developer supply device 1 fixed to the support frame 106 or formed integrally with the support frame 106.
It is equipped with 24. The developer supply device 124 has a developer outlet at a lower end located close to the periphery of the developing sleeve 110, and has a developer 126 (in the illustrated embodiment, a magnetic toner) contained in the developer supply device 124. A so-called component type developer consisting only of particles is supplied to the circumferential surface of the developing sleeve 110 through the developer outlet, and the magnetic member 11
It is held magnetically by the action of 2. Developing sleeve 1
The thickness of the layer of the developer 126 that is retained for 100 turns is the same as that of the developer 126 which is disposed below the developer outlet and whose leading edge is the developing
The size of the jar is controlled by the action of a known cutting board 128, which is located at a predetermined distance from the circumferential surface of the jar. A lid iao is provided on the upper surface of the developer supply device 124, and its inner edge (ie, the left edge in FIG. 7) is pivotally connected to the front wall of the developer supply container 124. Further, on the upper surface of the lid 130, an engagement arrow 132 projecting upward is formed. When the developing operation is performed, the developer 126 contained in the developer supply device 124 is extinguished, so that a predetermined number of developing operations can be performed. After the completion of the process, it is necessary to replenish the developer into the developer supply device 124. To replenish the developer into the developer supply device 124, the lid 130 is pivoted upward around its inner edge. This is accomplished by opening the top surface of the developer supply device 124 (the pivoting operation of the lid 130 when replenishing the developer and the action of the retaining protrusion 132 at that time will be described in detail later).

Next, a method of mounting the above-described developing device 20 will be explained. In the illustrated example, shaft support members 136a and x36b are fixed at predetermined positions on the inner surfaces of the pair of inner side plates 68α and 68b (FIGS. 3 and 8). As clearly shown in FIGS. 7 and 8, each of the shaft support members 136α and 136b has a circular hole 140 and an insertion slit 138 extending from the circular hole 140 with a width smaller than the diameter of the circular hole 140. have

On the other hand, short shafts 134 constituting shafted supports are provided near the upper ends of both ends of the support frame 106 of the developing device 2o. Each of such short axes 134 is shown in FIGS.
As clearly shown in the figure, it has a cross-sectional shape in which a circular cross-section corresponding to the circular hole 140 is cut along two chords that are parallel to each other and the distance between them is equal to or less than the width of the slit 1380. .

In the illustrated embodiment, after the rotating drum 14 has been installed in position within the housing 2 in the manner described above and after the right end wall 102 (FIGS. 1 and 2) of the how song 2 has been installed. The developing device 20 is installed before the right end of the housing 2 is closed.
The developing device 20 is inserted into the housing 2 through an opening that is later closed by the right end wall 102, and the above-mentioned short shaft 1 is provided in the support frame 106 of the developing device 20.
34 is positioned in the circular hole 140 of each of the shaft support members 136α and 136b through the slit 138 of each of the shaft support members 136α and 136b, and thus the short shaft is positioned in a predetermined position between the pair of inner side plates 68α and 68b. This is very easily accomplished by pivoting the mounting around the shaft 134. When the developing device 20 is rotatably mounted in this manner, the position of the short shaft 134 and the developing device 2
00 center of gravity, the developing device 20 is pivoted by its own it in the direction of the rotating drum 14, i.e. in the clockwise direction in FIGS. 2 and 7, so that the pair of spacer rings 114 of the developing device 20 are It is brought into contact with non-photosensitive areas 86 at both ends of the rotating drum 14.

Thus, as described above, the non-photosensitive area 86 of the rotating drum 14 has substantially the same outer diameter as the photoreceptor 82, and the spacer ring 114 of the developing device 20 has the same outer diameter as the developing sleeve 110.
Since it has an outer diameter larger than the outer diameter by a predetermined dimension,
The distance between the photoreceptor 82 and the surface of the developing sleeve 110 (that is, the distance that is important to set closely in order to perform good development) is automatically adjusted without the need for any special operation. It is closely set to a value that is half the difference between the outer diameter of the thermal ring 114 and the outer diameter of the developing sleeve 110. At the same time, the biasing effect (
That is, since the spacer ring 114 of the developing device 20 is brought into contact with the non-photosensitive area 86 of the rotating drum 14 due to the clockwise bias in FIGS. 2 and 7,
A leftward force acts on the rotating drum 14 in FIGS. 2 and 7, and this causes the bearing members 78 disposed at both ends of the rotating drum 140 to move inside the system and the supporting members 72α and 72b. It is restrained by the shaft support holes 90α and 90b (see also FIGS. 3 to 5), and
And separation of the rotating drum 14 from the 90b is prevented.

As described above, although the mounting mechanism for the developing device 20 is relatively simple and inexpensive, the developing device 20 can be mounted and removed extremely easily and quickly. It will be easily understood that the distance between the photoreceptor 82 of the rotating drum 14 and the developing sleeve 110 of the developing device 20 can be precisely set to a desired value without requiring special operations.

When the developing device 2o is installed following the rotating drum 14, the right end t43o2 of the housing 2 is connected to the set screw 142 (
It is mounted in a predetermined position using appropriate means such as those shown in FIGS. 1 and 2), and the right end opening of the housing 2 is closed.

In the specific example shown in FIG.
44 is installed. The elastic member 144 has its free end in contact with the support frame 106 of the developing device 2o, and
The developing device 20 is elastically biased toward the rotating drum 14, that is, clockwise in FIGS. 2 and 7. Therefore, in the specific example shown, the developing device 20 is forced clockwise in FIGS. The spacer ring 114 is brought into reliable contact with the non-photosensitive area 86 of the rotating drum 14,
In this way, the distance between the photoreceptor 82 of the rotating drum 14 and the developing sleeve 110 of the developing device 20 is reliably maintained at a predetermined value, and the rotational drum 14 is reliably maintained at a predetermined value. This will surely prevent their departure. However, if desired, the developing device 2
It is also possible to force the developing device 20 in the clockwise direction in FIGS. 2 and 7 by either the biasing action due to the weight of the roller itself or the action of the elastic side 14 by the elastic member 144.

In the illustrated example in which the rotating drum 14 and the developing device 20 are attached by the above-mentioned through-hole method,
For example, if a paper jam p occurs on the circumferential surface of the rotating drum 14, the right end wall 102 of the housing song 2 is removed, and then the rotating drum 14 is moved to the second position against the deflection effect due to the weight of the developing device 2. By moving the transfer paper by the required amount to the right in FIGS. 2 and 7, the jammed transfer paper can be easily removed. When replacing the photoreceptor 82 of the rotating drum 14, the developing device 20 is removed from the right end wall 102 of the housing 2, and then the rotating drum 14 is removed.

As is clear from FIGS. 2 and 7, in the illustrated electrostatic copying apparatus, a developing device 20 is mounted at a predetermined position within the housing 2, f'1. Then, the developer supply device 124 of the developing device 20 is connected to an outer wall defining a part of the housing 2;
In the illustrated case, the off-line 1 is located close to the right end wall 102. A portion of this right end wall 102 is formed of a developer supply device 146 that is closed by a rotary screw. In detail with reference to FIGS. 1, 132 and 7, the right end wall 102
A rectangular developer replenishment opening 148 is formed in the upper portion of the developer replenishment opening 148 , and this opening 140 is closed by a developer replenishment layer 146 forming a portion of the right end wall 102 . The upper edge of the developer replenishing layer 146 is pivotally connected to the main portion of the right end wall 102, so that it can be pivoted open inward, that is, in the direction indicated by arrow 150 in FIG. There is. Then, the developer supply layer 146 is pushed from the outside and rotated in the direction of the arrow 150, and the lower edge of the developer supply layer 146 is engaged with the developer supply layer 124 provided on the upper surface of the lid 130. The lid 130 comes into contact with the protrusion 132, and as the developer supply layer 146 pivots in the direction of the arrow 150, the lid 130 pivots about its inner edge (i.e., the left edge in FIG. 7) in the direction of the arrow 152. It is designed to be forced.

Therefore, when the developer supply layer 146 is turned to the position shown by the two-dot chain line in FIG. 7 and the opening 148 in the right end wall 102 is opened, the lid 130 of the developer supply device 124 is also rotated as shown in FIG. The upper surface of the developer supplying device 124 is also opened by rotating it at a position ffl''t shown by the two-dot chain line. When the developer supply layer 146 is returned to the position shown by the solid line and the opening 148 in the right end wall 102 is closed, the lid is closed. 130 is also returned to the position shown by the solid line due to its own weight, and the upper surface of the developer supply device 124 is closed.

If necessary, an appropriate elastic member (not shown) is provided to elastically force the C lid 13θ (and the developer replenishing layer 146) to the closed position shown by the solid line.
It is also possible to ensure that 46 is returned to the closed position by elastic action.

According to the above-mentioned opening structure, by simply pushing the lower part of the developer replenishing door 146 to open the opening 148 in the right end wall 102, the lid 130 can also be opened accordingly. It is possible to very easily and quickly replenish the developer into the developer supply device 124 through the opening 148 of the right end wall 102 and the upper surface of the developer supply device 124 without having to pull out the development device 20 from the housing 2 as shown in FIG. can.

Further, when the developer supply layer 146 is closed, the tray 130 is also automatically closed. Therefore, if the tray 130 is forgotten to close, the developer in the developer supply device 124 may pass through the upper surface of the developer supply device 124. Splashing into the housing 2 is reliably prevented.

In the illustrated example, the lower edge of the developer replenishment door 146 is engaged with the engagement protrusion 132 provided on the top surface of the lid 130, thereby allowing the opening of the developer replenishment field 146 to be performed. The lid 130 is configured to be opened, but instead of this, the developer supply field 146 and the lid 130 are connected by an appropriate link mechanism so that the developer supply field 146 is moved around (and closed). The lid 130 opens (and closes)
You can also do what you are forced to do. Further, in the illustrated example, the developer replenishment door 146 is opened by pivoting toward the inside of the housing 2, but the developer supply field 146 is opened by pivoting toward the outside of the housing 2. It can also be made to open by forcing it.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a specific example of an electrostatic copying apparatus according to the present invention. FIG. 2 is a simplified sectional view of the electrostatic copying apparatus shown in FIG. 1. FIG. 3 is a partial perspective view showing a method of mounting a rotating drum in the electrostatic copying apparatus shown in FIGS. 1 and 2. FIG. FIG. 4 is a perspective view of the rotating drum. FIG. 5 is a perspective view of a guide and support member used for mounting the rotating drum. FIG. 6 is a partially cutaway perspective view showing the developing device used in the copying machine shown in FIGS. 1 and 2. FIG. FIG. 7 is a simplified sectional view showing the rotating drum and developing device in the electrostatic copying apparatus shown in FIGS. 1 and 2. FIG. FIG. 8 is a partial perspective view showing the developing device used in the electrostatic copying apparatus shown in FIGS. 1 and 2. FIG. 2...Housing 14...Rotating drum 20...Developing devices 68α and 68b...Inner side plates 72α and 72b...Inside the system and supporting member 78...Rotating drum bearing member 80...Rotation Drum member 82 of the drum...Rotating drum photoreceptor 86...Non/i% light areas 90α and 90 of the rotating drum
b... Pivot support hole 92α and 92b of the guide and support member... Notch portions 94α and 94 of the shaft support hole
b...First certain inner surfaces 96α and 96b of the guide and support member...Second guide surface 102 of the guide and support member...Right end wall 106 of the housing...Support frame 110 of the developing device. Developing sleeve 112...Magnetic member 114-fist/spacer ring 124...Developer supply device 130...Developer supply device lid 132...Lid retaining protrusion 144...Bulging part control 46...Developer replenishment industry patent applicant Sanda Kogyo Co., Ltd. Procedural amendment supplementary form) July 30, 1980 Manabu Shiga, Commissioner of the Patent Office 1, Case indication patent application No. 113179 1982 2, Invention Name of electrostatic copying device 3, Relationship to the case of the person making the amendment Patent applicant address 1-2-28 Tamatsukuri, Kiku-ku, Osaka Name (6)
15) Sanda Kogyo Co., Ltd. 4, Agent 〒107 6, Subject of amendment

Claims (1)

[Claims] 1. A rotating drum having a photoreceptor on its surface is rotatably disposed at a predetermined position in an electrostatic copying device, and an electrostatic latent image is formed on the photoreceptor. A developing device for developing a hollow cylindrical developing device is disposed within the housing adjacent to the rotating drum, and the developing device includes a hollow cylindrical developing device extending substantially parallel to the central axis of rotation of the rotating drum. a sleeve, a roll-shaped magnet member disposed in a trap within the challenge sleeve, and a roll-shaped magnet member disposed coaxially and rotatably with the developing sleeve adjacent to each of both side ends of the developing sleeve; a pair of spacer rings having an outer diameter larger than the outer diameter by a predetermined dimension; a developer supply device for supplying developer to the circumferential surface of the developing sleeve; the developing series; the magnet member; In an electrostatographic reproduction apparatus of the type comprising a spacer ring and a support frame for supporting the developer supply device; The support frame of the developing device is rotatably mounted in a predetermined position within the housing, and the support frame of the developing device is rotatably mounted in a direction r; The entire developing device is forced toward the rotating drum by the biasing action, so that each of the pair of spacer rings is brought into contact with the surface of the rotating drum, and the photoreceptor and the developing sleeve are forced by the pair of spacer rings. An electrostatic copying apparatus characterized in that a distance from a surface of the rotary drum is set to a predetermined value, and detachment of the rotary drum is prevented. 2 A pair of shaft support members are provided within the housing song at intervals in the direction of the central axis of the rotating drum, and the pair of shaft support members are provided at both ends of the support frame of the developing device. Each of the members is provided with a pivoted support that is rotatably attached to each member, the pivot support member having a circular hole and a slit extending from the circular hole with a width smaller than the diameter of the circular hole, The pivoted support has a cross-sectional shape obtained by cutting a circular cross-section corresponding to the circular hole along two chords that are parallel to each other and the distance between them is equal to or less than the width of the slit, The electrostatic copying device according to claim 1, wherein the electrostatic copying device is detachably installed in the circular hole through the slit.