JPS6017475A - Electrostatic copying device - Google Patents

Abstract

PURPOSE:To remove easily jammed transfer paper without damaging photosensitive body by providing a rotary drum freely attachably and detachably in the vertical direction against its center axis. CONSTITUTION:Guide and supporting members 72a, 72b for guiding and supporting a drum 14 are mounted to side plates 68a, 68b provided at an interval in the direction of the center axis of the drum 14. These supporting members 72a, 72b are provided with notch parts 92a, 92b for supporting each bearing member 78 provided on both ends of the drum. Accordingly, each bearing member 78 of both ends of the drum 14 moves on the guide and supporting member, is engaged to the notch part and supported. As a result, the drum 14 becomes freely attachable and detachable in the vertical direction against its center axis. Since this device is formed in this way, the jammed transfer paper can be removed easily without damaging the photosensitive body.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electrostatic copying device, more specifically, a rotating drum having a photoreceptor on its surface is rotatably and removably disposed at a predetermined position within a static copying device housing. This invention relates to an improvement in the mounting method of a rotating drum in an electrostatic copying apparatus of the type described above.

As is well known to those skilled in the art, in recent years a rotating drum having a photoreceptor on its surface is used in an electrostatic copying machine to image an image of a type that is rotated at a predetermined position within a printer. An apparatus for forming an electrostatic latent image corresponding to an original image on the photoreceptor, or a developed image obtained by developing this electrostatic latent image, and then developing the electrostatic latent image or the developer on the photoreceptor. Electrostatic copying devices that carry out the so-called transfer-type electrostatic copying process of transferring a single image onto transfer paper are widely used for emergency purposes. In order to easily remove a transfer paper jam when it occurs around the rotating drum, and also to be able to replace or clean the photoreceptor as necessary, the photoreceptor is coated on the surface of the rotating drum. The above IL to meet! It is necessary to rotatably mount the J-roll drum at a predetermined position within the device housing and to mount it removably.

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, it has been found that there is an important problem to be solved with such a conventional configuration, namely, in an electrostatographic copying apparatus of a conventional configuration, the paper jam of the transfer paper occurs at the rotating drum stage. If this occurs, the rotating drum must be moved in the direction of its rotational center axis to remove it, but in this way, the jammed transfer paper remains in contact with the photoreceptor on the surface of the rotating drum. The rotating drum is moved against the jammed transfer paper, and when the rotating drum is removed, the jammed transfer paper rubs against the surface of the photoreceptor, which may cause damage or damage to the photoreceptor. There is a risk of deterioration. In conventional copying devices, when transfer paper jams occur around the circumferential surface of the rotating drum, the entire rotating drum is generally moved around the drum in order to remove the jammed transfer paper. It is necessary to move the jammed transfer paper to the outside, and therefore, the operation for removing the jammed transfer paper is complicated.

The present invention has been made in view of the above-mentioned facts, and its main purpose is to provide a rotary drum which ostensibly houses a photoreceptor and is rotatably and removably disposed at a predetermined position outside the housing. It is possible to install and unload the rotary drum by moving it in the direction of its central axis of rotation, and therefore to move the rotary drum in the direction of its rotation center axis. If paper jams occur around the circumference of the rotating drum, the entire rotating drum should be removed from the housing. To provide a new and submerged electrostatic copying device capable of removing a 5H-thick transfer paper without having to move the paper to another location, and thus easily and quickly performing the operation of removing jammed transfer paper. Kotodemeru.

According to the present invention, in an electrostatographic apparatus of the type in which a rotating drum having a photoreceptor on its surface is rotatably and removably disposed in a predetermined juxtaposition in an electrostatographic apparatus housing; Guide and support members are mounted at predetermined positions on the inner surfaces of the valleys of a pair of side plates arranged at intervals in the direction of the rotation center axis of the toad, and the valleys of the guide and support members include: a shaft support hole having a notch opening in a direction substantially perpendicular to the central axis; and a direction substantially perpendicular to the central axis following the notch of the shaft support hole; At least one uninner surface is formed extending in the direction; when an appropriate portion of each of the two sides of the cough rotating drum is moved along the valleys of the guide surface, each of the opposite sides of the rotating drum is positioned in each of the pivot holes through each of the notches, and configured such that the rotating drum is rotatably and removably mounted in a direction substantially perpendicular to the core central axis. A #P electronic copying device is provided.

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

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

The illustrated electrostatic copying apparatus has a generally rectangular parallelepiped-shaped housing, the entire body of which is indicated by the numeral 2. The upper surface of the housing 2 is provided with a document placement mechanism for holding a document to be copied. The document placement mechanism 4 in the illustrated example includes a support frame 6 mounted so as to be movable to the right in the document scanning direction (that is, in the left-right direction in FIG. 1 and FIG. 2) by an appropriate method, and A transparent plate 8 is fixed and on which the original to be copied is placed 1 m above, and one edge (the upper edge in FIG. 1) is connected to the support frame 6 to cover the original placed on the transparent plate 8. It consists of a document holding member 10 that can be brought into the state (the state shown in FIGS. 1 and 2), and an appropriate driving means (
(not shown), it can be moved appropriately in the left and right directions in Figures 1 and 2. Also, housing 2
The front part of the control i is equipped with control switches, etc.
An R channel 12 is arranged.

As schematically illustrated in FIG. 2, a cylindrical rotating drum 14 having a photoreceptor on at least a portion of its outer circumferential surface is located approximately at the center of the housing 2 and is rotated by a method that will be explained in detail later. It is attached freely and removably. On the chest circumference of the rotating drum 14, which is rotationally driven in the direction of the arrow 16, a charging corona discharge 'J218 for charging the 7i6 light body and a meter formed on the ji light body are sequentially arranged along the rotation direction of the rotary drum 14 in the direction of the arrow 16. A developing device constitutes a developing means for applying toner particles to the heavy latent image to make it a developed image, and in the illustrated example, also constitutes a cleaning means for removing residual toner particles remaining on the photoreceptor after the transfer process. (and cleaning) device [20, (this developing device 20 will be explained in detail later), a transfer corona discharger 22 for transferring the developed image formed on the photoreceptor to seven copies, and a transfer process corona discharger 22; A static eliminating lamp 24 for removing residual charges remaining on the photoreceptor later is self-extinguished.

An optical system 26 is arranged above the rotating drum 14 for projecting an image of the document held by the document placement 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, the second reflecting mirror 36 and the third reflecting mirror 38. This optical system 2G, as shown by the broken line arrow in FIG. Project the image onto the photoreceptor at the position .

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 that feeds the transfer paper one by one, and a pair of transport rollers that transport the transfer paper fed by the outer feed roller 54 through a pair of guide plates 56 to the transfer area where the transfer corona discharger 22 is arranged. 58. A pair of goose rollers 60 for separating the transfer paper that has been 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; It is comprised of a pressure roller pair 64 for pressurizing the transfer paper and fixing the developed image transferred onto the transfer paper under pressure, and a receiving tray 66 for receiving the transfer paper fed from the pressure roller pair 64.

How to Mount the Rotating Drum Next, the mounting method of the rotating drum 14 will be described with reference to FIGS. 3 to 5.

Referring to FIG. 3, in the specific example shown, the housing 2 (see FIGS. 1 and 2) is provided with a A pair of inner side plates 68α and 68b are disposed at a predetermined distance in the direction (direction). A guide and support member 72 used for the bag layer of the rotating drum 14 is placed at a predetermined position on the inner surface of each of the side plates 68α and 68b.
α and 72b are attached.

Before describing the configuration of the guide and support members 72α and 72b in detail, the rotary drum 1 will be explained with reference to FIG. 4 as well as FIG.
4, the illustrated rotary drum 14 includes a shaft 76, relatively small-diameter bearing members 78 (only one of which is shown in the figure) disposed at both ends of this ll+76. , and a drum member 80 fixed to the shaft 76 between the bearing members 78. A photoreceptor 82 made of a suitable material is disposed on the surface of the main portion of the drum member 80 . An annular curved portion 84 having a diameter somewhat smaller than the outer diameter of the photoreceptor 82 is present on the outer side of both ends of the photoreceptor 82 of the drum member 80, and an annular groove portion 84 is also provided on the outer side of the photoreceptor 82. There is a non-photosensitive region 86 which preferably has an outer diameter that is practically the same as the outer diameter of the photoreceptor 82. In the pair of annular grooves 84, there is a transfer paper that is brought into contact with the surface of the photoreceptor 82 for visual transfer (the transfer paper has a shape that is somewhat larger than the width of the photoreceptor 82, The tips of peeling claws (not shown), which are well known to those skilled in the art, are positioned on both side edges of the annular groove 84 (located at H'') from the surface of the photoreceptor 820 after transfer. In addition, in the pair of non-A!4v f, llJ areas 86, the distance between the surface of the developing sleeve of the developing device 20 and the photoreceptor 82 is set to a predetermined value, as will be explained in detail later. A pair of spacer rings are still abutted. Additionally, the illustrated rotating drum 14 has a diameter somewhat larger than the outside diameter of the photoreceptor 82 and the non-photosensitive area 86 near its negative end (i.e., between one end of the drum member 80 and one bearing member). A gear 88 is provided which preferably has a small outer diameter. A gear 88 that rotates together with the shaft 76 and the drum member 80 is connected to a drive source via a suitable gear mechanism (not shown) when the rotating tram 14 is installed in a predetermined position. is arrow 1 in Figure 2.
It is rotationally driven in the direction shown by 6.

Next, the structure of the pair of guide and support members '12a and 72b will be explained with reference to FIG. 5 together with FIG.
Each of the illustrated guide and support members 72α and 72b is a bearing member 78 disposed at both ends of the rotating drum 14.
It has shaft support holes 90α and 9obp for receiving each of them. 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 and in a substantially horizontal direction in Fig. 2). It is important to have the notches 92α and 92b. Guide and support member 72α and ? 2b further includes a notch 92 of the shaft support hole 90α and 90b.
a and 92b, extending in a direction substantially perpendicular to the central axis of rotation of the rotating drum 14;
It is important that guide surfaces are provided to guide appropriate parts on both sides of the rotating drum 140 when layering the drum. In the illustrated embodiment, such guide surfaces include guide and support members 72α and ? 26, and extends approximately horizontally (or slightly tilted upward) from the lower ends of the notches 92a and 92b of the shaft support holes 90α and 90b. The first one extends somewhat downwardly.
The striped surfaces 94α and 94b and the first striped surface 9
4α and 94b and the first striped surfaces 94α and 9
4b, the second guide surfaces 96α and 96 extend substantially horizontally below the guide surface 4b, then extend slightly upwardly, and further extend substantially horizontally.
It is composed of b. Guide and support members 72α and T
2b is preferably provided with circularly positioned protrusions 98α and 98b on the outer surface corresponding to the positions of the shaft support holes 90α and 90b.

The above guide and support members 72+z and 72b are as follows:
Their positions are determined by inserting the protrusions 98α and 9s b (r) into circular openings formed at predetermined positions of the side plates 68α and 68b, and aligning the positions of the shaft support holes 90α and 90b with the circular openings formed at predetermined positions of the side plates 68α and 68b. After that, the plurality of setscrews 100 are inserted into the side plate 68a.
The guide and support members 72α and T2b are screwed through the through holes formed in the side plates 68α and 68b to be mounted at predetermined positions on the inner surfaces of the side plates 68α and 68b.

The rotating drum 14 is attached to the guide and support members 72a and 72I as follows.

Referring to FIG. 2 as well as FIGS. 3 to 5, when installing the rotating drum 14, the developing device 20 and the right end wall 102 (the first
1 and 2) are not yet in place and have been removed, a force f is required. In such a state, the rotating drum 14 is first inserted into the housing 2 through an opening that will later be closed by the right end wall 102, that is, the right end opening of the housing 2, and a pair of non-photosensitive holes near both ends of the rotating drum 14 are Each of the regions 86 is provided with a guiding and supporting member? 2a and 72b second guide surfaces 96a and 9
6b on each end. Next, the rotary drum 14 is inserted into the support hole 9 along the second guide surfaces 96a and 961].
0a and 901) (i.e. to the left in Figure 2)
Make it move. That is, the guide surfaces 96a and 96b in FIG.
Rotating the upper part of the rotary drum 14 through the supporting holes 90a and 9
0b.During this movement, not only the non-photosensitive area 86 but also the gear 88 at one end of the rotating drum 14 (FIGS. 3 and 5) are moved toward the second guide surface 96.
b (therefore, in the illustrated example,
The width of the second guide surface 96b of the guide and support member 72b is wider than the width of the second guide surface 96a of the other guide and support member 72a by the width of the gearwheel 88). As described above, the outer diameter of the gear 88 is
Since the outer diameter of the gear 88 is somewhat smaller than the outer diameter of the second guide surface 96I, the gear 88 does not come into contact with the second guide surface 96I). The rotating drum 14 is
When the rotating drum 14 is moved by a predetermined amount along the guide surfaces 96a and 96b, each of the bearing members 78 disposed at both ends of the rotating drum 14 becomes a guide and support member. 2a and? 2b, respectively, on the first guide surfaces 94a and 94b. Thereafter, the bearing member 78 is caused to rotate on the first guide surfaces 94a and 941], and the rotating drum 14 is further moved along the first guide surfaces 94a and 94b into the support holes 90a and 901]. When the rotating drum 14 is moved in the opposite direction, the non-photosensitive area 86 of the rotating drum 14 separates from the second guide surfaces 96a and 96b, and the bearing member 78 passes through the notches 92a and 92b to the pivot holes 90a and 90b.
located within. Thus, the rotating drum 14 is rotatably and removably attached to the shaft support holes 90a and 9'Ob via the bearing members 78 disposed at both ends thereof. Rotating drum 14 with shaft support holes 90a and 90b
In the illustrated example, the spacer ring of the developing device 2o, which is mounted subsequent to the mounting of the rotating drum 14, comes into contact with the non-photosensitive area 86 of the rotating drum 14 and rotates, as will be explained in detail later. This is prevented by restraining the drum 24 within the shaft support holes 90a and 9o1]. If desired, an appropriate releasable restraint mechanism is provided to prevent the rotary drum 14 from coming off from the shaft support holes 90a and 9o1) through the notches 92a and 92b. You can also do that.

Note that the guide surfaces (first
The guide surfaces 94a and 94b and the second guide surfaces 96a and 96b) are not limited to those shown in the figures, but may be of any type as long as they guide the rotating drum 14 to the shaft support holes 90a and 90b as required. When the rotating drum 14 is moved along the guide surface, various components already installed in the housing 2 (for example, the supply roller 54 located below the rotating drum mounting position, It is important that the ram 14 is arranged so as to guide the rotating drum j4 without causing the ram 14 to collide with the pair of guide plates 56, the pair of conveyor rollers 58, etc. during rotation.

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 end portions of the drum 14 are brought into contact with the guide surface and guided.

In an electrostatic copying apparatus in which the rotating drum 14 is mounted in the manner described above, if a 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 guide surfaces a and 72b, 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 jammed transfer paper does not rub against the surface of the photoreceptor 82 when the rotating drum 14 moves. There is no fear that the surface of the photoreceptor 82 will be damaged or deteriorated. Furthermore, 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 out of the How Song 2, and the jammed transfer paper can be removed. This makes it easy to remove jammed transfer paper.

Next, the configuration 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 rotation center axis of the rotating drum 14 is fixed near the lower front surface of the support frame 106.The support shaft 108 has a hollow cylindrical shape. A developing sleeve 110 and a rolled magnet member 112 are attached.In the illustrated example, the developing sleeve 110 and the rolled magnet member 112 extend close to the circumferential surface of the rotating drum 14 and substantially parallel to the central axis of rotation of the rotating drum 14. The developing sleeve 110, which is important, is rotatably mounted on the support shaft 108,
On the other hand, a magnet member 112 located inside the developing sleeve 110 is fixed to the support shaft 108. Further, on the support shaft 108, a pair of spacer rings 114 (FIG. 8) are provided adjacent to each of both side ends of the developing sleeve 110.
It is mounted so that it can freely rotate independently of the 0. This spacer ring 114 is attached to the developing sleeve 11.
It is important to have an outer diameter that is a predetermined dimension larger than the zero outer diameter. Further, as shown in FIG. 8, a gear 116 is connected to one end of the developing sleeve 110, and a gear 116 is connected to one end of the supporting frame 106.
gear 118 engaged with gear 116 connected to
, and a gear 120 that rotates integrally with this gear 118.
is rotatably mounted. Once the developing device 20 is installed as required within the housing 2 as will be described later, the gear 120 is connected to the gear 88 (FIGS. (see also FIG.
10, and thus the developing sleeve 110 moves in the direction of arrow 1.
It is rotated in the direction indicated by 22. Note that in the illustrated developing device, the developing sleeve 110 is rotated;
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.

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 buckling developer supply 124 has a developer outlet at its lower end located proximate the periphery of the developer sleeve 110, and has a developer 126 (in the illustrated embodiment) contained within the developer supply 124. A so-called -component developer consisting only of magnetic toner particles is supplied to the circumferential surface of the developing sleeve 110 through the developer outlet, and the magnetic member 112
is held magnetically by the action of Developing sleeve 11
The thickness of the layer of developer 126 held on the circumferential surface of the developing sleeve 126 is such that the leading edge of the developing sleeve 126 is located below the developer outlet and has a leading edge of
The cutting board 128 is positioned at a predetermined distance from the circumferential surface of the cutting board 128 and is controlled to a desired size by the action of a well-known cutting board 128. On the upper surface of the developer supply device 124, there is provided 11307!11' whose inner edge (that is, the left edge in FIG. 7) is pivotally connected to the front wall of the developer supply device 124. An engaging protrusion 132 that projects upward is formed on the second surface of the lid 130. The developer 126 contained in the developer supply device 124 is consumed by performing the development operation, and therefore, it is necessary to replenish the developer in the developer supply device 124 after performing the development operation a predetermined number of times. However, replenishment of the developer into the developer supply device 124 is accomplished by rotating the M2B5 upward around its inner edge to open the top surface of the developer supply device 124 (when replenishing the developer The turning operation of the lid 130 and the action of the engaging protrusion 132 at that time will be described in detail later).

Next, a method of mounting the developing device 20 as described above will be explained. In the illustrated example, short shafts 134 are provided near the upper end of each side end of the support frame 106 of the developing device 20 . In addition, the pair of internal side plates 68a described above
and 68b (FIGS. 3 and 8), shaft support members 136a and 136b for rotatably supporting the short shaft 134 are fixed at predetermined positions on the inner surfaces of the shafts 134 and 68b (FIGS. 3 and 8).

In the illustrated embodiment, after the rotating drum 14 has been mounted in place within the housing 2 in a "double-column manner" and
The developing device 20 is installed before closing the right end of the housing 2 by installing the developing device 20 into the housing 2 through an opening that is later closed by the right end wall 102. and insert each of the short shafts 134 provided in the support frame 106 of the developing device 20 into the shaft support members 136a and 136b.
The shaft support member 136 is inserted through each slit portion 138 of
a and ] 36b, and is thus very easily accomplished by mounting it in a predetermined position between the pair of inner side plates 68a and 68b so as to be pivotable about the short axis 134. In this way, the developing device 2
0 is rotatably mounted, the developing device 20 moves in the direction of the rotating drum 14, that is, the second
The developing device 20 is rotated clockwise in the drawings and FIG. 7, so that the pair of spacer rings 114 of the developing device 20 are brought into contact with the non-photosensitive areas 86 at both ends of the rotating drum 14. Thus, as described in 1) 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 14 of the developing device 20 has a diameter smaller than the outer diameter of the developing sleeve 110. Because the outer diameter is larger by a predetermined dimension, the spacing between the photoreceptor 82 and the surface of the developer sleeve 110 (i.e., the spacing that is important to set accurately in order to achieve good development) can be adjusted with special repeatability. The value is precisely set to half the difference between the outer diameter of the spacer ring 114 and the outer diameter of the developing sleeve 110 automatically without requiring any operation. At the same time, the biasing effect (
(i.e. clockwise biasing action in Figures 2 and 7)
1! Therefore, 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,
A force acting to the left in FIGS. 2 and 7 acts on the rotating drum 14, causing the bearing members 78 disposed at both ends of the rotating drum 14 to move toward the guide and support portion 44.
' ? 2a and 72b (see also FIGS. 3 to 5), and prevents the rotary drum 14 from detaching from the shaft support holes 90a and 901).

As described above, although the mounting mechanism for the developing device 20 is relatively simple and inexpensive, it is possible to attach and detach the developing device 20 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 N10 of the developing device 20 can be precisely set to a desired value without requiring special operations.

When the developing device 20 is installed subsequent to the rotating drum 14, the right end wall 102 of the housing 2 is secured in place using suitable means such as a set screw 142 (FIGS. 1 and 2). Then, the right end opening of the housing 2 is closed.

(In the illustrated example, as shown in FIG. 7, an elastic member 1 is provided on the inner surface of the right end wall 102 of the housing 2.
44 has been taken. The bending elastic member 144 is
Its free end abuts the support frame 106 of the developer device 20, elastically biasing the developer device 20 in the direction of the rotating drum 14, ie, clockwise in FIGS. 2 and 7. Therefore, in the illustrated example, the developing device 20 is forced clockwise in FIGS. 2 and 7 due to the biasing action due to the weight of the developing device 2o itself and the biasing action of the elastic member 144. The ring 114 is securely brought into contact with the non-photosensitive area 86 of the rotating drum 14, and thus the photoreceptor 82 of the rotating drum 14 and the developing device 20 are
The distance between the guide and support member 72a and the developing sleeve 110 is reliably maintained at a predetermined value. The rotary drum 14 is reliably prevented from coming off from the shaft support holes 90a and 90b of the rotary drum 2b. If you wish, develop device 2
It is also possible to force the developing device 20 clockwise in FIGS. 2 and 7 by only one of the biasing action due to the weight of the roller itself and the elastic biasing action of the elastic member 144.

In the illustrated example in which the rotating drum 14 and the developing device 20 are installed in the manner described above,
For example, if a paper jam occurs on the circumferential surface of the rotating drum 14, the right end wall 102 of the housing 2 is removed, and then the rotating drum 14 is moved against the biasing action caused by the weight of the developing device 20 as shown in FIG. By moving the paper by the required amount to the right in FIG. 7, the jammed transfer paper can be easily removed. When replacing the photoreceptor 82 of the rotating drum 14, the developing device 20 may be removed following the right end wall 102 of the housing 2, and then the rotating drum 14 may be removed.

As is clear from FIGS. 2 and 7 in Chapter 1, in the illustrated electrostatic copying apparatus, when the developing device 20 is installed at a predetermined position in the housing 2, the developer in the developing device 20 is Supply device 12
Reference numeral 4 is configured to be located close to an outer wall defining a part of the housing 2, which is the right end wall 102 in the illustrated case. A portion of this right end wall 102 is formed of a developer replenishing section 146 that is opened and closed by rotating. To explain in detail with reference to FIGS. 1, 2, and 7, a rectangular developer supply opening 148 is formed in the upper part of the right end wall 102, and this frontage 148 is formed in the upper part of the right end wall 102.
48 is the developer replenishment layer 14 forming part of the right end wall 102;
Closed by 6. The upper edge of the developer replenishing section 146 is rotatably connected to the main portion of the right end wall 102, and can be opened by pivoting inward, that is, in the direction indicated by an arrow 150 in FIG. There is. When the developer supply section 46 is pushed from the outside and turned in the direction of arrow 150, the lower edge of the developer supply section 146 engages with the upper surface of the lid 30 of the developer supply device 124. The lid 130 comes into contact with the protrusion 132, and as the developer replenishing section 146 pivots in the direction of arrow 150, the lid 130 pivots about its inner edge (i.e., the left edge in FIG. 7) in the direction of arrow 152. It is designed to be forced. Therefore, when the developer replenishing section 146 is rotated to the position shown in FIG. It is rotated to the position shown by the two-dot chain line, and the upper surface of the developer supply device 124 is also opened. Developer supply section 146
When the lid 130 returns to the position shown by the solid line and the opening 148 of the right end wall 102 is closed, the lid 130 also returns to the position shown by the solid line due to its own weight and closes the upper surface of the developer supply device 124. If necessary, a suitable elastic member (not shown) may be provided to close the lid 130.
(and the developer replenishment section 146) may be elastically forced into the closed position shown by the solid line to ensure that the lid 130 and the developer replenishment 5146 are returned to the closed position by elastic action.

'' - According to the configuration as described, by simply pushing the lower part of the developer supply door 146 to open the opening 148 on the right end wall ''02, the lid 130 can also be opened accordingly. Developer can be replenished very easily and quickly into the developer supply device 124 through the opening 148 in 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 in a copying machine. It ends with that.

Furthermore, when the developer supply layer 146 is closed, the lid 130 is also automatically closed. Therefore, if the lid 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, by engaging the lower edge of the developer supply layer 146 with the engagement protrusion 132 provided on the upper surface of the lid 130, the lid opens as the developer supply layer 146 opens. However, instead of this, the developer supply layer 146 and the lid 130 are connected by an appropriate link mechanism, and the opening (and closing) of the developer supply layer 146 is controlled (=J Accordingly, the lid 130 can also be configured to be opened (and closed).
In the illustrated example, the developer supply layer 146 is opened by pivoting toward the inside of the housing 2, but the developer supply layer 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 electrostatic copying apparatus 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 68a and 68b...Inner side plates 72a and 72b...Guiding and supporting member 78...Rotating drum bearing member 80...Rotating drum Drum member 82... Rotating drum photoreceptor 86... Non-photosensitive areas 90a and 9. of the rotating drum. Ob...Guide and support member shaft support hole 9
2a and 9211...notches 94a and 94 of the shaft support hole
b...First guide surfaces 96'a and 961 of the guide and support member]...Second guide surface 102 of the guide and support part shrine...Right end wall 106 of the housing...Support frame of the developing device 110... Developing sleeve 112... Magnet member 114... Spacer ring 124... Developer supply device 130... Developer supply device lid 132... Lid engagement protrusion 144... Elasticity Member 146... Developer replenishment door procedure amendment () Seki, July 1980 30L1 Commissioner of the Japan Patent Office Manabu Shiga 1, Indication of the case Patent application No. 113178/1982 2, Name of the invention Electrostatic copying device 3 , Person making the amendment) Relationship with cows Patent applicant Place: 1-2-28 Tamatsukuri, Higashi-ku, Osaka Name (6
15) Sanda Kogyo Co., Ltd. 4, agent 107 Engraving of drawings (no changes to the contents)

Claims (1)

[Scope of Claims] 1. In an electrostatic copying apparatus of the type in which a rotating drum having a surface active photoreceptor is rotatably and removably disposed at a predetermined position within an electrostatic copying apparatus housing, 1. A guide and support member is attached to a predetermined position on the inner surface of each of a pair of side plates arranged with a gap in the direction of the rotation center axis of the drum; each of the guide and support members. includes a shaft support hole having a notch that is open in a direction substantially perpendicular to the central axis, and a shaft support hole that is substantially perpendicular to the central axis following the notch of the shaft support hole. At least one guide surface is formed that extends in a vertical direction; when a suitable portion of each side of the rotating drum is moved along each of the guide surfaces, the sides of the rotating drum are moved. each is positioned in each of the pivot holes through each of the notches, and is configured such that the rotating drum is rotatably and removably mounted in a direction substantially perpendicular to the central axis. An electrostatic copying device characterized by: 2. The rotating drum includes a shaft, relatively small-diameter bearing members disposed at each of both ends of the shaft, and a drum member attached to the shaft between the bearing members, The photoreceptor is disposed on the surface of the main portion of the drum member, and non-photosensitive regions having substantially the same outer diameter as the surface of the photoreceptor are present at both end portions of the drum member, and The guide surfaces formed on each of the guide and support members include a first guide surface extending from the lower end of the cutout portion of the shaft support hole, and a second guide surface extending inside the first guide surface. and a guide surface: when each of the non-photosensitive areas of the rotating drum is moved along each of the second guide surfaces, each cherry bearing member of the rotating drum is formed with the first guide surface. and each of the bearing members is positioned on each of the first bearing members.
When the bearing members are moved along each of the guide surfaces of the second guide surface, each of the non-photosensitive areas separates from the valleys of the second guide surface, and each of the bearing members passes through each of the notches and extends into the pivot hole. 2. A silent copying apparatus according to claim 1, wherein the copying apparatus is configured to be positioned within each of the following. 3. An inner-walled cylindrical developing sleeve extending substantially parallel to the central axis of the rotating drum, a rolled magnet member disposed within the developing sleeve, and each of the opposite ends of the developing sleeve. A pair of spacer rings are adjacently disposed coaxially and rotatably with the developing sleeve and have a predetermined outer diameter larger than the outer diameter of the developing sleeve; A developing device includes a developer supply device for supplying developer, an eye development sleeve, the magnet member, the pair of spacer rings, and a support frame for supporting the developer supply device. The supporting frame body is disposed adjacent to the periphery of the drum; the support frame body is rotatably mounted at a predetermined position between the pair of side plates, and the support frame body is rotatably mounted at a predetermined position between the pair of side plates; The electrostatic copying device according to claim 2, wherein the entire developing device is forced toward the rotating drum so that each of the pair of spacer rings comes into contact with each of the non-photosensitive areas of the rotating drum. Device. The electrostatic copying apparatus according to claim 3, wherein the developing device is disposed behind the rotary drum when viewed in the direction of movement of the rotary drum when the rotary drum is mounted.