JP4998453B2 - Photoconductor support structure and image forming apparatus - Google Patents

Description

  The present invention relates to a photoreceptor support structure and an image forming apparatus.

  In the case of an image forming apparatus that requires high image quality, when positioning the photosensitive member, the penetrating shaft that passes through the cylindrical photosensitive member is passed from the back side support plate to the front side, and the position in the direction intersecting the penetrating shaft at the bearing The structure which decides is taken. At this time, the position of the photosensitive member in the direction intersecting with the through shaft is determined by the fit between the through shaft and the bearing.

  On the other hand, regarding the positioning of the photoreceptor in the through-axis direction, the following structures are known.

  In Patent Document 1, the position of the photosensitive member in the axial direction is determined by pushing a wedge-shaped member into the opening of the front frame of the frame having a circular outer surface and supporting the front and rear ends of the photosensitive member. .

Further, in Patent Document 2, a conical recess is formed in the frame of the photoconductor, and an axial position of the photoconductor is determined by pressing a shaft having a conical tip against the recess of the photoconductor frame. .
JP 2001-042587 A JP 2002-206754 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a photosensitive member support structure capable of positioning the photosensitive member in the axial direction and replacing the photosensitive member, and an image forming apparatus having the photosensitive member support structure.

The photoconductor support structure according to claim 1 is a cylindrical photoconductor having both ends supported by two frames having a circular outer surface;
A rotating shaft that passes through the center of each of the two frames and rotates the photosensitive member;
A front support plate that rotatably supports the outer periphery of the front end portion of the rotary shaft and spreads in a direction in which the rotary shaft is a vertical line;
A contact member that contacts the front surface of the first frame located on the front end side of the two frames;
The photoconductor support structure includes a pressing member that is interposed between the front support plate and the contact member and elastically presses the contact member against the first frame.

  According to a second aspect of the present invention, there is provided the photosensitive member support structure according to the first aspect, wherein an operation unit disposed on a front surface of the front support plate and freely contacting and separating from the front support plate, and the front from the operation unit. Extending to the back side of the front support plate through the support plate, and pulling the abutting member toward the front support plate when receiving a first operation in a direction to separate the operation portion from the front support plate The photosensitive member support structure further includes a first operation member having an attracting shaft for separating the contact member and the first frame body.

  Further, the photoreceptor support structure according to claim 3 is the photoreceptor support structure according to claim 2, wherein the front support plate supports the attraction shaft while the operation unit is separated from the front support plate. This is a photoreceptor support structure having an axis support structure.

  According to a fourth aspect of the present invention, there is provided an image forming apparatus comprising the photosensitive member supporting structure according to any one of the first to third aspects, wherein a toner image is formed on the photosensitive member and the toner image is placed on a sheet. An image forming apparatus that forms an image of a fixed toner image on the paper by transferring and fixing.

  The image forming apparatus according to claim 5 is the image forming apparatus according to claim 4, wherein the front support plate includes an element excluding the rotation shaft of the photosensitive member support structure from a housing of the image forming apparatus. 1 is an image forming apparatus configured to be pulled out freely.

Further, an image forming apparatus according to claim 6 is the image forming apparatus according to claim 5,
An intermediate transfer member that is disposed in contact with the photosensitive member and receives a transfer of a toner image formed on the photosensitive member and re-transfers the toner image onto a sheet;
A second operating member for receiving a second operation for separating the intermediate transfer member from the photosensitive member,
The second operation member is positioned on the front surface of the front support plate in a state before receiving the second operation, and has an operation prohibiting piece for prohibiting the drawing operation of the front support plate before the second operation. An image forming apparatus.

  According to the first aspect of the present invention, a photosensitive member support structure is realized in which the photosensitive member is positioned in the axial direction and the photosensitive member can be replaced.

  According to the second aspect of the present invention, it is possible to realize a photosensitive member support structure in which the photosensitive member can be easily replaced as compared with the structure without the first operation member.

  Further, according to the third aspect of the present invention, a photoconductor support structure is realized in which the photoconductor can be replaced more easily than in the case where the shaft support structure is not provided.

  According to the fourth aspect of the present invention, an image forming apparatus is realized in which the photosensitive member is positioned in the axial direction to contribute to high-quality image formation, and the photosensitive member can be replaced when the photosensitive member is worn.

  According to the fifth aspect of the present invention, the photoconductor can be easily replaced as compared with the configuration in which it cannot be pulled out.

  Further, according to the sixth aspect, it is possible to prevent the intermediate transfer member from being damaged when the photosensitive member is replaced.

  Hereinafter, embodiments of the present invention will be described.

  FIG. 1 is a principle configuration diagram showing an outline of an image forming apparatus.

  In FIG. 1, an image forming apparatus 1 having a paper transport unit 10, an image forming unit 20, and a paper storage unit 30 is shown.

  The image forming unit 20 includes image forming units 21Y, 21M, 21C, and 21K corresponding to colors of Y (yellow), M (magenta), C (cyan), and K (black), an intermediate transfer body 22, A next transfer unit 24 and a fixing device 25 are included. Here, in order to avoid complication of illustration, only components constituting the image forming unit 21Y are described with reference numerals, but the configurations of the remaining image forming units 21M, 21C, and 21K are also handled. The configuration is the same as that of the image forming unit 21Y except that the color of the toner is different.

  The image forming unit 21Y forms a toner image by electrophotography. The image forming unit 21Y includes a photoreceptor 211, a charger 212, an exposure device 213, a developing device 214, a primary transfer device 215, and the like. The image forming unit 21Y and the image forming units 21M, 21C, and 21K transfer toner images of Y (yellow), M (magenta), C (cyan), and K (black) to the intermediate transfer body 22 (primary transfer). To do.

  The description will be continued by taking the image forming unit 21Y as a representative.

  Hereinafter, the image forming units 21Y, 21M, 21C, and 21K may be referred to as the image forming unit 21 as a representative.

  The photoreceptor 211 is a drum-shaped member that rotates in the direction of arrow A. The charger 212 charges the surface of the photoconductor 211. The exposure unit 213 irradiates a charged photoconductor 211 with a beam (reference numeral Bm in the drawing) to form an electrostatic latent image. The developing device 214 forms a toner image by attaching toner to the electrostatic latent image formed on the photoreceptor 211. The primary transfer unit 215 transfers the toner image formed on the photosensitive member 211 to the intermediate transfer member 22. The primary transfer device 215 is applied with a voltage having a polarity opposite to the charging polarity of the toner, and the toner image on each photoconductor 211 constituting each image forming unit 21Y, 21M, 21C, 21K is transferred. The intermediate transfer body 22 is sequentially electrostatically attracted to form a color toner image in which the toner images of the respective colors are superimposed on the intermediate transfer body 22.

  The intermediate transfer member 22 is a belt-like member that is stretched by a plurality of rolls and configured to be rotatable in the direction of arrow B shown in the drawing. Here, the roll which stretches the intermediate transfer member 22 is driven by a motor (not shown) to rotate the intermediate transfer member 22 and applies a certain tension to the intermediate transfer member 22 and intermediate transfer. There are a tension roll 292 having a function of preventing the meandering of the body 22, an idle roll 293 that supports the intermediate transfer body 22, and a backup roll 242.

  The paper transport unit 10 has been transported by the pick-up roll 11 that feeds and transports the paper P stored in the paper storage unit 30, the transport roll 12 that transports the paper P fed by the pickup roll 11, and the transport roll 12. A guide member 234 that feeds the paper P to a secondary transfer position by the secondary transfer unit 24 and a transport belt 235 that transports the paper P after the secondary transfer to the fixing device 25 are provided.

  In the secondary transfer unit 24, a secondary transfer roll 241 disposed in pressure contact with the toner image holding surface side of the intermediate transfer body 22 and a counter electrode of the secondary transfer roll 241 disposed on the back surface side of the intermediate transfer body 22 are provided. A backup roll 242 is provided. Further, a brush roll 244 that removes dirt adhering to the secondary transfer roll 241 is disposed in the secondary transfer section 24 in contact with the secondary transfer roll 241. Furthermore, a metal power supply roll 243 that contacts the backup roll 242 and applies a secondary transfer bias is disposed.

  Further, a belt cleaner 294 for cleaning the surface of the intermediate transfer body 22 after the secondary transfer is provided on the downstream side of the secondary transfer roll 241 in the rotation direction of the intermediate transfer body 22. On the other hand, an image density sensor 295 for measuring the density of the image on the intermediate transfer body 22 for adjusting the image quality is disposed on the upstream side of the secondary transfer roll 241.

  Further, on the upstream side of the image forming unit 21Y, a reference sensor (home position sensor) 296 that generates a reference signal serving as a reference for taking an image forming timing in each image forming unit 21 is disposed. The reference sensor 296 recognizes a mark provided on the back side of the intermediate transfer member 22 and generates a reference signal. Each image forming unit 21 starts image formation at each timing based on the reference signal.

  The fixing device 25 is provided with a roll member for heating and pressurizing the paper P, and fixes the toner image transferred onto the paper P onto the paper P. The paper P on which the toner image has been fixed by the fixing device 25 is sent out of the image forming apparatus 1.

  FIG. 2 is an external perspective view of the image forming apparatus whose principle configuration is shown in FIG. However, here, a state in which the front panel covering the front surface is removed is shown for illustration of the internal structure, and illustration of other elements is partially omitted for illustration of the main elements in this embodiment. Has been.

  A drawer-type sheet storage unit 30 is provided at the lower part of the image forming apparatus shown in FIG. 2, and four image forming units 21Y, 21M, 21C, and 21K are arranged at the upper part. Further, an endless intermediate transfer member 22 extending in contact with the image forming units 21Y, 21M, 21C, and 21K is disposed below the four image forming units 21Y, 21M, 21C, and 21K.

  Further, an operation bar 41 arranged so as to cross the four image forming units 21Y, 21M, 21C, and 21K is provided below the front face of the four image forming units 21Y, 21M, 21C, and 21K. The operation lever 41 is rotated by a manual operation and falls in the direction of arrow A shown in FIG. When the operation lever 41 is tilted in the direction of the arrow A, the intermediate transfer member 22 is slightly moved downward by the movement of the operation lever 41, and the photosensitive member 211 provided in each of the four image forming units 21 (see FIG. 1). A little away from. Since the photoconductor 211 is gradually worn during use, it is necessary to replace it. This is a measure for preventing the photoconductor 211 from rubbing against the intermediate transfer body 22 when the photoconductor 211 is replaced. The operation lever 41 corresponds to an example of a second operation member according to the present invention.

  FIG. 3 is an external perspective view showing the same image forming apparatus as the image forming apparatus shown in FIG. 2, with the image forming unit pulled out, and FIG. 4 is an enlarged perspective view with the image forming unit pulled out. is there.

  The four image forming units 21 can be pulled out independently. In FIG. 3, the operation lever 41 is in a state after the operation (falling state).

  When the operation lever 41 is in the upright state shown in FIG. 2, the intermediate transfer member 22 is in contact with the photosensitive member 211 constituting each image forming unit 21. If the intermediate transfer member 22 is in contact with the photosensitive member 211 when the image forming unit 21 is pulled out, the photosensitive member 211 may be rubbed against the intermediate transfer member 22 to damage the intermediate transfer member 22. Therefore, here, when the operation lever 41 is in the standing state shown in FIG. 2, the operation lever 41 is in the way of preventing the image forming unit 21 from being pulled out. When the operation lever 41 is tilted as shown in FIG. 3, the front surface of the image forming unit 21 is opened, and each image forming unit 21 can be pulled out independently.

  5 and 6 are perspective views showing the front end portion of one image forming unit from the front side and the rear side, respectively. 5 and 6, the photoconductor 211 is in a state of being positioned in the direction of the rotation axis (hereinafter referred to as “positioning state”).

  7 is a cross-sectional side view of the image forming unit in a positioned state taken along a plane that includes the rotation axis of the photosensitive member and extends vertically, and FIG. 8 is a cross-sectional perspective view showing the cross section of FIG. .

  Further, FIG. 9 is a cross-sectional plan view of the image forming unit in a positioned state taken along a horizontal plane including the rotation axis of the photoconductor, and FIG. 10 is a cross-sectional perspective view showing the cross section of FIG.

  As shown in FIG. 1, the image forming unit 21 includes a developing unit 214 and other components in addition to the photosensitive member 211. The feature of the present embodiment is a support structure of the photosensitive member, and here, a part thereof Elements are not shown, and the support structure for the photoreceptor will be mainly described.

  In the following, description will be made mainly with reference to FIG. 7 and with reference to other drawings as necessary.

  The photoconductor 211 is formed in a cylindrical shape by being supported by two frames 211_2a and 211_2b (see FIG. 5) having both ends of a photoconductor film 211_1 having a photoconductor layer having a circular outer surface. Moreover, the rotating shaft 28 which penetrates the center of these two frames 211_2a and 211_2b is provided here. The rotating shaft 28 is configured such that a rear end portion thereof is freely rotatable and fixedly supported except for rotation, and receives a rotational driving force at the rear end portion. A drive delivery member 28_1 is fixed to the rotation shaft 28. The rotation shaft 28 is connected to the front frame body 211_2a via the drive delivery member 28_1. When the rotation shaft 28 rotates, the rotation is transmitted to the frame body 211_2a. Then, the frame 211_2a and the photosensitive film 211_1 supported by the frame 211_2a also rotate integrally with the rotation shaft 28.

  Further, a front support plate 221 is provided on the front surface of the photosensitive member 211 so as to extend in a direction in which the rotation shaft 28 is a perpendicular line. A support opening 221_1 (see FIG. 7) is formed in the front support plate 221, and a bearing 222 by a ball bearing is disposed in the support opening 221_1, and a rotating shaft front end portion of the photosensitive member 211 is inserted into the bearing 222. It is supported. The position accuracy of the photoconductor 211 in the left and right and up and down directions excluding the rotation axis direction (front and back direction) depends on the position accuracy of the bearing 222, and the left and right and up and down positioning is performed by the bearing 222.

  The front end portion 211_21a of the front frame body 211_2a extends in a cylindrical shape, and the back surface of the contact member 223 is in contact with the front end surface 211_22a. The contact member 223 is formed in a cylindrical shape with an open front surface, and is configured to move back and forth while being guided by a guide member 224 that is also formed in a cylindrical shape and has an open rear surface. A coil spring 225 is disposed in the internal space surrounded by the contact member 223 and the guide member 224. The contact member 223 is pressed by the coil spring 225 to press the front end surface 211_22a of the frame body 211_2a backward. The frame 211_2a is pressed against the drive delivery member 28_1 by the pressing of the frame 211_2a by the abutting member 223, whereby the position of the photoconductor 211 in the front-rear direction (rotation axis direction) is determined.

  Further, here, an operation member 226 is provided, and a disc-shaped operation unit 226 </ b> _ <b> 1 constituting the operation member 226 is disposed on the front surface of the front support plate 221.

  Further, the operation member 226 is provided with two attracting shafts 226_2 that extend from the operation portion 226_1 through the front support plate 221 to the back side of the front support plate 221 (see FIG. 9). Further, a weak coil spring 226_3 is disposed between the front support plate 221 and the operation unit 226_1 so as to surround the attracting shaft 226_2. The rear end portion (the front end portion extending to the back side of the front support plate 221) of the drawing shaft 226_2 is locked to the contact member 223 via the annular member 229. For this reason, the operating member 226 is disposed in a state in which the attracting shaft 226_2 is pulled backward by the action of the coil spring 225 and the operating portion 226_1 is substantially in contact with the front support plate 221. Further, the drawing shaft 226_2 has a hollow portion 226_21 formed in the middle thereof in a small diameter. The effect | action of this hollow part 226_21 is mentioned later.

  The operation member 226 is an operation member that is operated when the photoconductor 211 is replaced, and corresponds to an example of a first operation member according to the present invention.

  A handle 227 (see FIG. 5) is provided on the front surface of the front support plate 221, and the image forming unit 21 is pulled out to the state shown in FIG. 3 by holding the handle 227 by hand. Can be pushed to the state.

  Further, as shown in FIG. 5, a guide shaft 228 is fixed to the front surface of the front support plate 221. Further, the front support plate 221 is formed with a deformed hole 221_2. For example, FIG. 5 and the like show the image forming unit 21 with the charger 212 (see FIG. 1) and the like removed, but the irregularly shaped hole 221_2 and the guide shaft 228 have the charger 212 (see FIG. 1). And a guide shaft for guiding the charger 212 at that time.

  A depression 28_2 is formed on the front end surface of the rotating shaft 28 of the photoconductor 211. The depression 28_2 is for attaching a tachometer for measuring the rotation speed of the photoconductor 211 during maintenance. This is irrelevant to the photoreceptor support structure in the present embodiment.

  11 and 12 are perspective views showing the front side and the back side of the front end portion of one image forming unit, respectively, in the retracted state described below.

  13 is a cross-sectional side view of the image forming unit in the retracted state taken along a plane that includes the rotation axis of the photosensitive member and extends vertically, and FIG. 14 is a cross-sectional perspective view showing the cross section of FIG. is there.

  15 is a cross-sectional plan view of the image forming unit in the retracted state taken along a horizontal plane including the rotation axis of the photoconductor, and FIG. 16 is a cross-sectional perspective view showing the cross section of FIG.

  Here, description will be made mainly with reference to FIG. 15 and with reference to other drawings as necessary.

  A hole 221_1 (see, for example, FIG. 11) of the front support plate 221 through which the drawing shaft 226_2 of the operation member 226 passes has a shape in which two circular holes are connected, and the operation portion 226_1 of the operation member 226 is formed. Is pulled in the direction away from the front support plate 221 and rotated slightly, the recess 226_21 (see, for example, FIG. 9) of the pulling shaft 226_2 is locked to the hole 222_1 of the front support plate 221, and the operation portion 226_1 is supported in the front. The operation member 226 can be supported by the front support plate 221 while being separated from the plate 221. As described above, the front end portion of the pulling shaft 226_2 constituting the operation member 226 is locked to the abutting member 223 via the annular member 229, and the operation portion 226_1 is moved forward in the direction of separating from the front support plate 221. When pulled, the contact member 223 is pulled forward by the pulling shaft 226_2. Then, the contact member 223 is guided by the guide member 224 while contracting the coil spring 225 and moves forward (to the front support plate 221 side) so as to overlap the guide member 224, and the contact member 223 and the photosensitive member 221 are overlapped. A gap 230 is formed between the front end 211_22a of the frame body 211_2a. When the operation portion 226_1 is slightly rotated in this state, the depression portion 226_21 of the pulling shaft 226_2 is locked to the front support plate 221 as described above, and the operation member 226 is fixed to the front support plate 221 in this state. . Here, the state in which the contact member 223 is retracted from the frame body 211_2a is referred to as a retracted state.

  In exchanging the photoconductor 211, first, the image forming unit 21 including the front support plate 221 and the photoconductor 211 is pulled out from the housing of the image forming apparatus 1 as shown in FIG. 3. Here, since the rear end of the rotating shaft 28 is fixed to the housing side of the image forming apparatus 1, when the image forming unit 21 is pulled out from the housing, the rotating shaft 28 is pulled out from the photosensitive member 211. Therefore, the operation unit 226_1 is further operated to be in the retracted state, and the photosensitive member 211 is removed using the gap 230. After the photosensitive member 211 is removed, a new photosensitive member 211 is attached, and when the operation unit 226_1 is slightly rotated in the opposite direction, the recess 226_21 of the pulling shaft 226_2 is detached from the front support plate 221, and the operation member 226 is operated by the action of the coil spring 225. Is pulled rearward, the back surface of the contact member 223 comes into contact with the front end surface 221_22a of the frame 221_2a of the photoconductor 221, and pushes the photoconductor 211 backward. As a result, the frame 211_2b (see FIG. 5) on the rear end side of the photoconductor 211 comes into contact with a rear support plate (not shown) constituting the drawn image forming unit 21. Thereafter, when the image forming unit 21 is pushed into the housing of the image forming apparatus 1, the rotating shaft 28 passes through the photosensitive member 211 and enters the positioning state shown in FIG. Immediately before the final positioning state shown in FIG. 7 is reached, the drive delivery member 28_1 fixed to the rotary shaft 28 abuts against the front end side frame body 211_2a, and the entire image forming unit 21 is pushed slightly thereafter. The rear end side frame body 211_2a floats from the rear support plate (not shown), and the photoconductor 211 is positioned at a position where the front end side frame body 211_2a is pressed against the drive delivery member 28_1. The

  FIG. 17 is a perspective view showing the positional relationship between the plurality of image forming units and the operating lever in the positioning state, and FIG. 18 is a side sectional view showing the positional relationship between the plurality of image forming units and the operating lever in the positioning state. is there.

  FIG. 19 is a side cross-sectional view showing the operation lever in a slightly tilted state. 20 is a perspective view showing a plurality of image forming units in the retracted state, and FIG. 21 is a side sectional view showing the plurality of image forming units in the retracted state.

  As described above, the operation lever 41 is disposed below the front surface of the four image forming units 21Y, 21M, 21C, and 21K arranged side by side, and extends to the left and right across the four image forming units 21Y, 21M, 21C, and 21K. ing.

  The operation lever 41 is provided with an operation prohibiting piece 411 extending upward corresponding to each of the image forming units 21Y, 21M, 21C, and 21K. The operation member 226 is provided with a locking tongue 226_4 below the operation portion 226_1.

  In the positioning state shown in FIGS. 17 and 18, the operation lever 41 is in an upright state, and the operation prohibiting piece 411 of the operation lever 41 spreads up to a position where it overlaps with the locking tongue piece 216_4 of the operation member 226 in the vertical direction. Yes.

  In this state, when the image forming unit 21 is pulled out or the operation unit 226_1 is pulled out, the locking tongue piece 226_4 hits the operation prohibiting piece 411 and cannot be pulled out.

  Therefore, the operation lever 41 is rotated in the direction of arrow A shown in FIG. 19 (same as the direction of arrow A shown in FIG. 2). Then, the operation prohibiting piece 411 is retracted from the front surface of the locking tongue piece 226_4, and the image forming unit 21 and the operation unit 226_1 can be pulled out. The operation lever 41 is originally operated until it is turned sideways as shown in FIG. 3, and the intermediate transfer member 22 is separated from the photosensitive member 211. However, in FIG. 20 and FIG. It is shown in a rotated state.

  As described above, the operation order is uniquely determined by making the drawer of the image forming unit 21 and the operation of the operation member 226 impossible only after the operation lever 41 is operated. This eliminates the risk of scuffing and scratching.

1 is a principle configuration diagram showing an outline of an image forming apparatus. 1 is an external perspective view of an image forming apparatus. FIG. 3 is an external perspective view showing a state in which the image forming unit is pulled out. FIG. 3 is an enlarged perspective view in a state where an image forming unit is pulled out. FIG. 3 is a perspective view showing a front end portion of the image forming unit from the front side. FIG. 3 is a perspective view showing a front end portion of the image forming unit from the rear side. FIG. 3 is a cross-sectional side view when the image forming unit in a positioned state is cut along a plane that includes the rotation axis of the photoconductor and extends vertically. It is the cross-sectional perspective view which showed the cross section of FIG. FIG. 3 is a cross-sectional plan view when the image forming unit in a positioned state is cut along a horizontal plane including the rotation axis of the photoreceptor. FIG. 10 is a cross-sectional perspective view showing a cross section of FIG. 9. FIG. 3 is a perspective view showing a front side of the front end portion of the image forming unit in a retracted state. FIG. 3 is a perspective view showing a rear side of the front end portion of the image forming unit in a retracted state. FIG. 4 is a cross-sectional side view of the image forming unit in a retracted state taken along a plane that includes the rotation axis of the photoconductor and extends vertically. It is a cross-sectional perspective view which showed the cross section of FIG. FIG. 3 is a cross-sectional plan view when the image forming unit in the retracted state is cut along a horizontal plane including the rotation axis of the photoconductor. It is the cross-sectional perspective view which showed the cross section of FIG. FIG. 5 is a perspective view showing a positional relationship between a plurality of image forming units and an operation lever in a positioning state. FIG. 5 is a side cross-sectional view illustrating a positional relationship between a plurality of image forming units and an operation lever in a positioning state. It is side surface sectional drawing which shows the operation lever in the state which fell slightly. FIG. 4 is a perspective view showing a plurality of image forming units in a retracted state. FIG. 4 is a side cross-sectional view illustrating a plurality of image forming units in a retracted state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 10 Paper conveyance part 11 Pickup roll 12 Conveyance roll 20 Image formation part 21Y, 21M, 21C, 21K Image formation unit 22 Intermediate transfer body 24 Secondary transfer part 25 Fixing device 28 Rotating shaft 28_1 Drive delivery member 30 Paper accommodation Unit 41 operation lever 211 photoconductor 211_1 photoconductor film 211_2a, 211_2b frame 211_3 rotating shaft 211_21a front end 211_22a front end surface 211_31 recess 212 charger 213 exposure unit 214 developing unit 215 primary transfer unit 221_1 front support plate 221_1 Contact member 224 Guide member 225 Coil spring 225_4 Locking tongue piece 226 First operation member 226_1 Operation part 226_2 Reducing shaft 226_21 Depression part 227 Handle 229 Annular member 2 0 gap-out between 411 operation prohibition piece

Claims (6)

A cylindrical photoconductor having both ends supported by two frames having a circular outer surface;
A rotating shaft that passes through the center of each of the two frames and rotates the photosensitive member;
A front support plate that rotatably supports the outer periphery of the front end portion of the rotary shaft and spreads in a direction in which the rotary shaft is a vertical line;
A contact member that contacts the front surface of the first frame located on the front end side of the two frames;
A photoreceptor support structure comprising a pressing member interposed between the front support plate and the contact member and elastically pressing the contact member against the first frame.   An operation portion disposed on the front surface of the front support plate and freely contacting and separating from the front support plate, and extending from the operation portion to the back side of the front support plate through the front support plate, the operation portion being connected to the front support plate A first pulling shaft for pulling the contact member away from the first frame body by pulling the abutting member toward the front support plate when receiving a first operation in a direction away from the first support plate; The photoreceptor support structure according to claim 1, further comprising an operation member.   3. The photoreceptor support structure according to claim 2, wherein the front support plate has a shaft support structure that supports the drawing shaft while the operation unit is separated from the front support plate.   A photoconductor support structure according to claim 1, wherein a toner image is formed on the photoconductor, and the toner image is fixed on the paper by transferring and fixing the toner image on the paper. An image forming apparatus for forming an image including a toner image.   5. The front support plate according to claim 4, wherein the front support plate is configured such that it can be pulled out from a housing of the image forming apparatus together with elements other than the rotation shaft of the photosensitive member support structure. Image forming apparatus. An intermediate transfer member that is disposed in contact with the photosensitive member and receives a transfer of a toner image formed on the photosensitive member and re-transfers the toner image onto a sheet;
A second operating member for receiving a second operation for separating the intermediate transfer member from the photosensitive member,
The second operation member is positioned on the front surface of the front support plate in a state before receiving the second operation, and has an operation prohibiting piece for prohibiting the drawing operation of the front support plate before the second operation. The image forming apparatus according to claim 5.

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