Abstract:
A disassembling tool pushes first and second coupling members out of a process cartridge that also has an electrophotographic photosensitive member, and first and second coupling members for rotatably coupling first and second frames of the cartridge together. The disassembling tool includes first and second base bodies, first and second engagement portions provided on the first and second base bodies respectively, and engageable with the cartridge to position the cartridge when the tool is mounted on the cartridge, and first and second pushing-out portions provided for movement relative to the first and second base bodies, respectively, for pushing out the first and second coupling members, respectively. The first and second engagement portions are provided at a location opposed to the first and second pushing-out portions, respectively, in a movement direction in which the first and second pushing-out portions are moved, respectively.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
   This application is a divisional application of application Ser. No. 10/653,229, filed Sep. 3, 2003, now U.S. Pat. No. 7,073,251, issued on Jul. 11, 2006. 

   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   This invention relates to a disassembling tool for disassembling a process cartridge detachably attached to an image forming apparatus such as a copying machine, a laser beam printer or a facsimile apparatus. 
   2. Related Background Art 
   In an image forming apparatus using an electrophotographic image forming process, there is adopted a process cartridge comprising an electrophotographic photosensitive member and process means for acting on the electrophotographic photosensitive member integrally made into a cartridge which is made detachably attachable to an image forming apparatus main body. According to this process cartridge system, the maintenance of the image forming apparatus can be done by a user himself without resort to a serviceman and therefore, the usability of the image forming apparatus is markedly improved. 
   As the construction of such a process cartridge, there is one in which two frame bodies are coupled together. For example, a photosensitive member frame body for supporting a photosensitive drum, a charging device and a cleaning device, and a developing device frame body comprising a developing frame body for supporting developing means and a toner frame body having a toner chamber, the developing frame body and the toner frame body being joined together, are coupled together for rotation about a fulcrum. The two frame bodies are biased about the aforementioned fulcrum by a resilient member such as a spring to thereby determine the relative position of the photosensitive drum and the developing means. The functional merits of adopting the above-described construction are that the pressure force of a developing roller against the photosensitive drum can be made proper, and that the interval between the surface of the photosensitive drum and the surface of the developing roller can be maintained constant. Further, the use of the aforedescribed two frame bodies leads to many merits such as the facilitation of the molding of the frame bodies and the facilitation of assembly. 
   In the above-described conventional process cartridge, an engagement pin bringing a developing device unit and a photosensitive member unit into engagement with each other is required to have sufficient withstanding pull-out strength to ensure the engagement between the two units. Also, the engagement pin is installed so as to be fully embedded in a holding portion so that the user may not pull out the engagement pin by mistake. 
   To disassemble the process cartridge, the engagement pin coupling the two units together is pulled out, and the process cartridge is disassembled into the developing device unit and the photosensitive member unit. 
   SUMMARY OF THE INVENTION 
   It is an object of the present invention to provide a disassembling tool which can easily disassemble a process cartridge having a first frame and a second frame. 
   It is another object of the present invention to provide a disassembling tool which can simply detach a coupling member rotatably coupling a first frame and a second frame together. 
   It is another object of the present invention to provide a disassembling tool which can be easily positioned relative to a process cartridge, and can reliably detach a coupling member rotatably coupling a first frame and a second frame together. 
   It is another object of the present invention to provide a disassembling tool which can simply push a coupling member out of a process cartridge. 
   It is another object of the present invention to provide a disassembling tool for pushing a coupling member out of a process cartridge detachably attachable to an image forming apparatus main body and having an electrophotographic photosensitive member, process means for acting on the electrophotographic photosensitive member, a first frame, a second frame and the coupling member for rotatably coupling the first frame and the second frame together, the disassembling tool having a base body, an engagement portion provided on the base body and adapted to be engaged with the process cartridge to thereby position the process cartridge when the disassembling tool is mounted on the process cartridge, a pushing-out portion provided for movement relative to the base body for pushing out the coupling member, and a grip portion adapted to be gripped when the pushing-out portion is to be moved, and connected to the pushing-out portion, the engagement portion being provided at a location opposed to the pushing-out portion in a movement direction in which the pushing portion is moved. 
   It is another object of the present invention to provide a disassembling tool for pushing a first and a second coupling member out of a process cartridge detachably attachable to an image forming apparatus main body, the process cartridge having an electrophotographic photosensitive member, process means for acting on the electrophotographic photosensitive member, a first frame, a second frame, the first coupling member provided on one end side of the electrophotographic photosensitive member in the lengthwise direction thereof for rotatably coupling the first frame and the second frame together, and the second coupling member provided on the other end side of the electrophotographic photosensitive member in the lengthwise direction thereof for rotatably coupling the first frame and the second frame together, the aforedescribed coupling members are to be pushed, the disassembling tool having a first base body, a first engagement portion provided on the first base body and adapted to be engaged with the process cartridge to thereby position the process cartridge when the disassembling tool is mounted on the process cartridge, a first pushing-out portion provided for movement relative to the first base body for pushing out the first coupling member, a second base body, a second engagement portion provided on the second base body and adapted to be engaged with the process cartridge to thereby position the process cartridge when the disassembling tool is mounted on the process cartridge, and a second pushing-out portion provided for movement relative to the second base body for pushing out the second coupling member, the first engagement portion being provided at a location opposed to the first pushing-out portion in a movement direction in which the first pushing-out portion is moved, and the second engagement portion being provided at a location opposed to the second pushing-out portion in a movement direction in which the second pushing-out portion is moved. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a perspective view of a disassembling tool according to a first embodiment of the present invention. 
       FIG. 2  is a perspective view of the disassembling tool according to the first embodiment of the present invention. 
       FIGS. 3A and 3B  are perspective views showing a method of disassembling a process cartridge according to the first embodiment of the present invention. 
       FIGS. 4A and 4B  are cross-sectional views showing the method of disassembling the process cartridge according to the first embodiment of the present invention. 
       FIGS. 5A and 5B  are perspective views showing the method of disassembling the process cartridge according to the first embodiment of the present invention. 
       FIGS. 6A and 6B  are cross-sectional views showing the method of disassembling the process cartridge according to the first embodiment of the present invention. 
       FIG. 7A  is a perspective view of a disassembling tool according to a second embodiment of the present invention, and  FIG. 7B  is a front view of the disassembling tool according to the second embodiment of the present invention. 
       FIG. 8  is a perspective view of a disassembling tool according to a third embodiment of the present invention. 
       FIG. 9A  is a front view of the disassembling tool according to the third embodiment of the present invention, and  FIG. 9B  is a front view of the disassembling tool according to the third embodiment of the present invention. 
       FIG. 10  is a perspective view of a disassembling tool according to a fourth embodiment of the present invention. 
       FIG. 11A  is a perspective view showing the way of holding the disassembling tool according to the fourth embodiment of the present invention, and  FIG. 11B  is a perspective view showing the way of holding the disassembling tool according to the fourth embodiment of the present invention. 
       FIG. 12  is a front view of a disassembling tool according to a fifth embodiment of the present invention. 
       FIG. 13  is a front view of the disassembling tool according to the fifth embodiment of the present invention. 
       FIG. 14  is a front view of a disassembling tool according to a sixth embodiment of the present invention. 
       FIG. 15  is a front view of the disassembling tool according to the sixth embodiment of the present invention. 
       FIG. 16  is a front view of the disassembling tool according to the sixth embodiment of the present invention. 
       FIG. 17A  is a perspective view of a disassembling tool according to a seventh embodiment of the present invention, and  FIG. 17B  is a perspective view of the disassembling tool according to the seventh embodiment of the present invention. 
       FIG. 18  is a cross-sectional view of a process cartridge to be disassembled by the disassembling tool according to the present invention. 
       FIG. 19  is a side view of the process cartridge to be disassembled by the disassembling tool according to the present invention. 
       FIG. 20  is a cross-sectional view of the photosensitive member unit of the process cartridge to be disassembled by the disassembling tool according to the present invention. 
       FIG. 21  is a side view of the process cartridge to be disassembled by the disassembling tool according to the present invention. 
       FIG. 22A  is a perspective view showing the frame body coupling portion of the process cartridge to be disassembled by the disassembling tool according to the present invention, and  FIG. 22B  is a perspective view showing the frame body coupling portion of the process cartridge to be disassembled by the disassembling tool according to the present invention. 
       FIG. 23  is a perspective view of a pin used for the frame body coupling of the process cartridge to be disassembled by the disassembling tool according to the present invention. 
       FIG. 24  is a cross-sectional view showing the method of disassembling the process cartridge by the disassembling tool according to the present invention. 
       FIGS. 25A and 25B  are cross-sectional views showing the method of disassembling the process cartridge by the disassembling tool according to the present invention. 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENT 
   Some embodiments of the present invention will hereinafter be described. 
     FIG. 18  shows a cross-sectional view of a process cartridge P to be disassembled by the use of a disassembling tool which is an embodiment of the present invention. 
   In  FIG. 18 , in the photosensitive member unit B of the process cartridge P, there are disposed a photosensitive drum  10  as an electrophotographic photosensitive member on which an electrostatic latent image is to be formed, a charging device  11  for uniformly charging the surface of the photosensitive layer of the photosensitive drum, and cleaning means  14  for scraping off any residual toner adhering onto the photosensitive drum  10  from the surface of the photosensitive drum  10 , and storing it in a waste toner container  12 . 
   Also, in a developing device unit A, there are disposed a toner container  21  as process means containing a toner therein, a developing roller  20  as process means for supplying the toner to the electrostatic latent image formed on the photosensitive drum  10  to thereby form a visible image, and a developing blade  22  as process means for imparting triboelectrification charges to the toner to thereby form a toner layer on the surface of the developing roller  20 . 
   Now, in  FIG. 18 , the photosensitive drum  10  is rotated clockwise. A predetermined voltage is applied to the charging device  11 , and when the photosensitive drum  10  contacts the charging device  11 , the surface of the photosensitive layer of the photosensitive drum  10  is uniformly charged. Then, a laser beam conforming to image information from an optical system  1  is applied onto the photosensitive drum  10  through an exposure opening portion  2  formed in a cleaning frame body  13  to thereby form an electrostatic latent image on the photosensitive drum  10 . Thereafter, a toner image is formed on the photosensitive drum  10  by developing means. 
   Here, the developing means feeds the toner in the toner container  21  to the developing roller  20  by the rotation of a toner feeding member  23 . The developing roller  20  containing a stationary magnet therein is then rotated. Then, a toner layer having triboelectrification charges imparted thereto by the developing blade  22  is formed on the surface of the developing roller  20 , and the toner is supplied to the developing area of the photosensitive drum  10 . The toner is shifted to the photosensitive drum  10  in conformity with the aforementioned electrostatic latent image to thereby form a toner image. Here, the developing blade  22  prescribes the amount of toner on the peripheral surface of the developing roller  20  and also imparts triboelectrification charges thereto. Also, a toner agitating member  24  for circulating the toner in a developing chamber is rotatably mounted near the developing roller  20 . 
   A voltage opposite in polarity to the aforementioned toner image is applied to a transferring roller  3  provided in an image forming apparatus main body to thereby transfer the toner image formed on the photosensitive drum  10  to a recording medium  4 . Thereafter, any residual toner on the photosensitive drum  10  is removed by the cleaning means  14 . The cleaning means  14  scrapes off the toner residual on the photosensitive drum  10  by an elastic cleaning blade  14   a  provided in abutting relationship with the photosensitive drum  10  and collects it into the waste toner container  12 . 
   Also, as shown in  FIG. 20 , a drum flange  36  is an integrally molded article having a drum gear  10   b , a convex shaft  37  and a convex portion  37   a , and is a driving force transmitting part having the function of transmitting a driving force. A concave portion  39  is provided on the image forming apparatus side to transmit the driving force to the convex portion  37   a . A bearing  38  is of a concave shape in order to receive the concave portion  39  and to effect the positioning of the cartridge P when mounted on the image forming apparatus main body.  FIG. 21  shows the fixing of the bearing  38  to the cleaning frame body  13 , and there are formed concave portions  38   a  and  38   c , in which screws  38   b  are inserted and fixed. 
     FIGS. 22A and 22B  show the coupling of the developing device unit A and the photosensitive member unit B. 
   The developing device unit A and the photosensitive member unit B are pivotally coupled together by a coupling pin  50  having a circular cross section to thereby constitute the cartridge P. That is, as shown in  FIG. 22A , circular pivot apertures  41  are formed parallel to the developing roller  20  at the tip ends of arm portions  19  formed on the opposite sides of a developing frame body  15  in the lengthwise direction thereof (the axial direction of the developing roller  20 ). On the other hand, concave portions  33  for inserting the arm portions  19  thereinto are provided at two locations on the opposite sides of the cleaning frame body  13  in the lengthwise direction thereof. The arm portions  19  are inserted into these concave portions  33 , and the coupling pin  50  is forced into the outer supporting hole  31   a  of the cleaning frame body  13 . The coupling pin  50  is then fitted into the pivot aperture  41  at the end of the arm portion  19  and is further forced into an inner supporting hole  31   b  and is attached thereto, whereby the developing device unit A and the photosensitive member unit B are coupled together for pivotal movement about the coupling pin  50 . 
   A mounting portion for the coupling pin  50  will now be described in detail. The arm portions  19  of the developing device unit A are inserted into the concave portions  33  between the inner side plate B 1  and the outer side plate B 2  of the photosensitive member unit B. Positioning is effected so that the outer supporting hole  31   a , the inner supporting hole  31   b  and the pivot apertures  41  may be disposed substantially coaxially with one another. Thereafter, the coupling pin  50  is forced in from the outside of the outer side plate B 2  of the photosensitive member unit B. The outer diameter portion of the coupling pin  50 , the outer supporting hole  31   a  and the inner supporting hole  31   b  are in a tight fit relationship with one another, and the outer diameter portion of the coupling pin  50  and the pivot apertures  41  are in a loose fit relationship with each other. Consequently, after the coupling pin  50  has been forced in, the developing device unit A is supported for pivotal movement about the coupling pin  50 , while on the other hand, the coupling pin  50  is restrained in the photosensitive member unit B with strength to withstand a predetermined or greater pull-out load. An aperture portion  32  of a bag aperture shape is provided around the inner supporting hole  31   b  to enhance the holding force of the coupling pin  50  and prevent the slipping-out of the pin and the fall of the shavings of the frame body during the insertion thereof. The coupling pin  50  has its rear end portion inserted thereafter to the position of the bag hole bottom  32   b  of the aperture portion  32 . Also, the coupling pin  50  may be such a pin having a level difference in the diametral direction thereof as shown in  FIG. 23 . 
   The coupling of the developing device unit A and the photosensitive member unit B on the lengthwisely opposite side is done in a similar manner. 
   First Embodiment 
   First Disassembling Tool 
   A first disassembling tool  60  shown in  FIG. 1  is such that a first positioning portion  61  and a second positioning portion  62  are provided on a first plate  64  which is a supporting portion or base body. 
   A pushing-out portion  63  is fixed to two connecting bars  66  parallel to each other. Further, the connecting bars  66  extend through the first plate  64  and are fixed to a second plate  67  at fixing portions  67   a  and  67   b . The fixing may be effected by forming holes in the second plate  67  and fitting the connecting bars into the holes, or may be effected by the use of screws. 
   As described above, the connecting bars  66  extend through the first plate  64  and are fixed to the pushing-out portion  63  and the second plate  67  and therefore, the first plate  64  becomes slidable in the direction of arrow C between the second plate  67  and the pushing-out portion  63 . Therefore, the pushing-out portion  63  becomes slidable in the direction of arrow D relative to the first positioning portion  61  and the second positioning portion  62  provided on the first plate  64 . 
   Also, the first positioning portion  61  is of a concave shape so as to be positioned on a convex portion  37   a  provided on one end of the photosensitive drum  10  shown in  FIG. 21 , and is made of resin so as not to injure or bruise the convex portion  37   a  during positioning. Also, the second positioning portion  62  is of a convex shape so as to be engaged with and positioned by a slot  13   b  formed in the cleaning frame body  13 . Thereby the mounting angle of the first disassembling tool  60  onto the cleaning frame body  13  is determined. 
   While in the foregoing, the positioning of the first positioning portion  61  is done relative to the convex portion  37   a  of the photosensitive drum  10 , it may be done anywhere if the first positioning portion  61  can be fixed to the frame, and may be done relative to a bearing  38 , as shown in  FIG. 21 . Also, the positioning may be done by the heads of screws  38   b , or may be done by concave portions  38   a  and  38   c . Also, the second positioning portion  62  may be provided at any location at which the angle of the disassembling tool is determined, and may be provided at a blank portion E between ribs. That is, it may be provided at any location on the outer surface of the cartridge P at which the disassembling tool  60  can be easily positioned. 
   While in the foregoing, the first positioning portion is of a concave shape and the second positioning portion is of a convex shape, it is also possible to select a concave shape or a convex shape in conformity with the shape of the locations at which they are positioned. 
   A pushing-out pin  63   a  is provided on the pushing-out portion  63  in a direction facing the aforedescribed first positioning portion and second positioning portion. The diameter r 1  of the tip end of the pushing-out pin  63   a  is in the relation that r 1 .ltoreq.r 2  relative to the diameter r 2  of the coupling pin  50 . Also, a pin discharging port  64   a  for discharging the pushed-out coupling pin  50  out of the cartridge P may be provided at a location on the first plate  64  which faces the pin  50  (this will be described later in detail in a disassembling method which will be described later). 
   The pushing-out portion  63  is inserted into the interior of the cartridge P from an exposure opening portion  2  provided in the cleaning frame body  13  of the cartridge P shown in  FIG. 21 , and reaches the location of the coupling pin  50 . 
   Second Disassembling Tool 
   The first disassembling tool  60  is a tool for pushing out the coupling pin  50  on the convex portion  37   a  side ( FIG. 21 ) of the photosensitive drum  10 , whereas a second disassembling tool  70  shown in  FIG. 2  is a tool for pushing out the coupling pin  50  provided on the lengthwisely opposite side. The same portions as those of the aforedescribed first disassembling tool  50  need not be described. 
   As shown in  FIGS. 19 and 20 , a cylindrical guide  13   a L for rotatably supporting the photosensitive drum  10  on the cleaning frame body  13  and supporting the process cartridge on the image forming apparatus, and for effecting the grounding of the photosensitive drum  10  is provided on the other end of the photosensitive drum  10 . 
   A first positioning portion  71  of the second disassembling tool  70  is of a concave shape so as to be positioned on the cylindrical guide  13   a L. Also, a second positioning portion  72  is engaged with and positioned by a slot  13   c  (see  FIG. 19 ) formed in the cleaning frame body  13 . Thereby the mounting angle of the second disassembling tool  70  onto the cleaning frame body  13  is determined. 
   While in the foregoing, the positioning of the first positioning portion  71  is done relative to the cylindrical guide  13   a L, the first positioning portion  71  may be positioned anywhere if it can be fixed to the frame, and the positioning thereof may be done by screws  29   a , as shown in  FIG. 19 . Also, the second positioning portion  72  may be provided at any location at which the angle of the disassembling tool is determined, and may be provided in a blank portion F between ribs. 
   While in the foregoing, the first positioning portion is of a concave shape and the second positioning portion is of a convex shape, it is also possible to select a concave shape or a convex shape in conformity with the shape of the locations at which they are positioned. 
   A description will now be provided of a method of disassembling the cartridge P by the use of the above-described first disassembling tool  60  and second disassembling tool  70 . 
   Disassembling Method 
     FIGS. 3A ,  3 B to  FIGS. 6A and 6B  are perspective views and cross-sectional views showing the manner in which the cartridge P is disassembled by the use of the first disassembling tool  60  and the second disassembling tool  70 . 
   When the cartridge P is to be disassembled, use is first made of the first disassembling tool  60  ( FIGS. 3A ,  3 B,  4 A and  4 B). The cleaning frame body  13  is provided with the exposure opening portion  2  for applying therethrough a laser beam from the optical system  1  provided in the image forming apparatus L to the photosensitive drum  10 . 
   The pushing-out portion  63  is inserted into the interior of the cartridge through the exposure opening portion  2  by rotating the tool  60  ( FIG. 3A ). Thereafter, the first positioning portion  61  is positioned by a convex portion  37   a  provided on one end of the photosensitive drum  10  and the second positioning portion is fitted into a slot  13   b  formed in the cleaning frame body  13  ( FIGS. 3B and 4A ). Thereafter, the second plate  67  is slid in the direction of arrow G while the first plate  64  is held down by a hand ( FIGS. 3B and 4B ). Then, the pushing-out portion  63  destroys the bag hole bottom  32   b  provided in the cleaning frame body  13  and pushes the coupling pin  50  out of the cartridge P through the pin discharging port  64   a  formed in the first plate  64  ( FIG. 4B ). In this case, the diameter r 1  of the tip end of the pushing-out pin  63   a  of the pushing-out portion  63  is in the relation that r 1 &lt;r 2  relative to the diameter r 2  of the coupling pin  50  and therefore, after the pushing-out portion  63  has destroyed the bag hole bottom  32   b , it can push the coupling pin  50  out of the cartridge P. Consequently, it never happens that the diameter of the hole  32  with which the coupling pin is engaged is enlarged. That is, it never happens that the coupling pin  50  comes off when it is again inserted during reproduction. 
   Also, when as shown in  FIGS. 23 and 24 , in case that the pin is a coupling pin  51  having a level difference in the diametral direction thereof, a bag hole shape need not be provided in the outer side plate B 2  of the photosensitive member unit. That is, the coupling pin  51  is positioned on the outer side plate B 2  of the photosensitive member unit by the level difference portion  51   a  and therefore, it never happens that the coupling pin  51  comes off relative to the direction of insertion. Accordingly, the level difference portion  51   a  strikes against the outer side plate B 2  of the photosensitive member unit when the coupling pin  51  is inserted again and therefore, it never happens that the coupling pin  51  comes down into the cartridge P. 
   Also, in the above-described embodiment, the pin discharging port  64   a  is provided to take out the coupling pin  50  when the coupling pin  50  is pushed out by the pushing-out portion  63 . However, if as shown in  FIGS. 25A and 25B , the tip end of the coupling pin  50  which has been pushed out is brought outwardly of the outer side plate B 2  of the photosensitive member unit and it is pulled out by a hand, the pin discharging port  64   a  need not be provided. 
   Subsequently, the coupling pin  50  in the lengthwisely opposite direction is likewise taken out by the use of the second disassembling tool  70  ( FIGS. 5A ,  5 B,  6 A and  6 B). 
   The pushing-out portion  73  is inserted through the exposure opening portion  2  while the tool is rotated ( FIG. 5A ). Thereafter, the first positioning portion  71  is positioned by the cylindrical guide  13   a L provided on the other end of the photosensitive drum  10  the second positioning portion  72  is fitted in the slot  13   c  formed in the cleaning frame body  13  ( FIGS. 5B and 6A ). Thereafter, as in the case of the above-described first disassembling tool  60 , the coupling pin  50  is pushed out of the cartridge P ( FIG. 6B ). 
   Second Embodiment 
   As shown in  FIGS. 7A and 7B , level difference portions  66   a  larger in diameter than the through-holes of the first plate  64  are provided on the connecting bars  66  of the first disassembling tool  60  adjacent to the second plate  67 . When the above-described construction is adopted, a prescribed interval g is maintained between the first plate  64  and the second plate  67 . Therefore, after positioning has been effected by the first positioning portion  61  and the second positioning portion  62 , when the second plate  67  is slid in the direction of arrow H while the first plate  64  is held down by a hand, it is possible to put the fingers into the interval g, and the second plate  67  can be gripped easily. It is possible to adopt a similar construction also in the second disassembling tool  70 . 
   Third Embodiment 
   As shown in  FIGS. 8 ,  9 A and  9 B, level difference portions  66   a  larger in diameter than the through-holes of the first plate  64  are provided on the connecting bars  66  of the first disassembling tool  60  adjacent to the second plate  67 . Further, biasing means  100  are provided on the small-diametered portions  66   b  of the connecting bars  66  between the first plate  64  and the pushing-out portion  63 . The biasing means  100  are formed by compression coil springs or the like to bias the first plate  64  and the pushing-out portion  63  away from each other. By the above-described construction, the second plate  67  is slid in the direction of arrow I and the coupling pin  50  is pushed out, whereafter the first plate  64  is biased in the direction of arrow J by the biasing means  100  and is returned to the level difference portions  66   a  ( FIG. 9B ). Thus, when the first disassembling tool  60  is used next time, the prescribed interval g is maintained from the first, and the work of returning the first plate  64  to the level difference portions  66   a  can be omitted. It is possible to adopt a similar construction also in the second disassembling tool  70 . 
   Fourth Embodiment 
   As shown in  FIG. 10 , two connecting bars  68  parallel to each other are fixed onto the first plate  64  of the first disassembling tool  60 . The connecting bars  68  extend through the second plate  67  and are fixed to a third plate  69  by fixing portions  69   a  and  69   b . By adopting the above-described construction, the second plate  67  and the third plate  69  provide grip portions when disassembly is effected. That is, as shown in  FIG. 11A , the third plate  69  can be held by one hand and the second plate  67  can be slid in the direction of arrow K by the other hand to thereby push out the coupling pin  50 . Alternatively, as shown in  FIG. 11B , the third plate  69  can be held by the thumb and the palm and the second plate  67  can be slid in the direction of arrow L by the other fingers than the thumb. The above-described construction is also possible in the second disassembling tool  70 . 
   Fifth Embodiment 
   In the disassembling tool shown in the fourth embodiment, it is also possible to adopt the construction shown in the second embodiment. That is, as shown in  FIG. 12 , level difference portions  66   a  larger in diameter than the through-holes of the first plate  64  may be provided on the connecting bars  66  adjacent to the second plate  67 . Also, as shown in  FIG. 13 , level difference portions  68   a  larger in diameter than the through-holes of the second plate  67  may be provided on connecting bars  68  adjacent to the first plate  64 . The above-described constructions are also possible in the second disassembling tool  70 . 
   Sixth Embodiment 
   In the disassembling tool shown in the fifth embodiment, it is also possible to adopt the construction shown in the third embodiment. That is, as shown in  FIG. 14 , urging means  100  may be provided on the small-diametered portions  66   b  of the connecting bars  66  between the pushing-out portion  63  and the first plate  64 . Also, as shown in  FIG. 15 , biasing means  100  may be provided on the small-diametered portions  68   b  of the connecting bars  68  between the second plate  67  and the third plate  69 . Also, as shown in  FIG. 16 , the urging means  100  may be provided on both of the connecting bars  66  and  68 . The above-described constructions are also possible in the second disassembling tool  70 . 
   Seventh Embodiment 
   Third Disassembling Tool 
     FIGS. 17A and 17B  show a third disassembling tool  80 . A first positioning portion  81  and a second positioning portion  82  are provided on a first plate  84 , which comprises a first base body. A first pushing-out portion  83  is fixed to two connecting bars  86  parallel to each other, and the connecting bars  86  extend through the first plate  84  and are fixed to a second plate  87 , which comprises a second base body, by fixing portions  87   b  and  87   c . A first positioning portion (unillustrated) and a second positioning portion  92  are provided on the opposite surfaces of the fixing portions  87   b  and  87   c  on the second plate  87 . A second pushing-out portion  93  is fixed to two connecting bars parallel to each other, and the connecting bars extend through the second plate  87  and are fixed to the first plate  84  by fixing portions  84   b  and  84   c.    
   As described above, the connecting bars  86  extend through the first plate  84  and are fixed to the first pushing-out portion  83  and the second plate  87 . Consequently, the first plate  84  becomes slidable in the direction of arrow M between the second plate  87  and the first pushing-out portion  83 . Therefore, the first pushing-out portion  83  becomes slidable in the direction of arrow N relative to the first positioning portion  81  and the second positioning portion  82  provided on the first plate  84 . 
   Also, the connecting bars extend through the second plate  87  and are fixed to the second pushing-out portion  93  and the first plate  84 . Consequently, the second plate  87  becomes slidable in the direction of arrow O between the first plate  84  and the second pushing-out portion  93 . Therefore, the second pushing-out portion  93  becomes slidable in the direction of arrow P relative to the first positioning portion and the second positioning portion  92  provided on the second plate  87 . 
   The first positioning portion  81  is of a concave shape so as to be positioned on the convex portion  37   a  provided on one end of the photosensitive drum  10  shown in  FIG. 21 . The first positioning portion  81  is made of resin so as not to injure or bruise the convex portion  37   a . Also, the second positioning portion  82  is of a convex shape so as to be positioned relative to the slot  13   b  formed in the cleaning frame body  13 . The second positioning portion  82  determines the mounting angle of the third disassembling tool  80  onto the cleaning frame body  13 . 
   While in the foregoing, the positioning of the first positioning portion  81  is effected relative to the convex portion  37   a  of the photosensitive drum  10 , it may be done anywhere if the first positioning portion  81  can be fixed to the frame, and as shown in  FIG. 21 , the positioning may be effected relative to the bearing  38 . Also, the positioning may be effected by the heads of the screws  38   b , or may be effected by the concave portions  38   a  and  38   c . Also, the second positioning portion may be provided at any location at which the angle of the disassembling tool is determined, and may be provided in the blank portion E between ribs. 
   A pushing-out pin  83   a  is provided on the first pushing-out portion  83  in a direction facing the aforedescribed first positioning portion and second positioning portion, and the diameter r 1  of the tip end thereof is in the relation that r 1 &lt;r 2  relative to the diameter r 2  of the coupling pin  50 . Also, a pin discharging port  84   a  for discharging the pushed-out coupling pin  50  out of the cartridge P may be provided at a location on the first plate  84  which faces the pin  50 . 
   The first positioning portion on the second plate  87  is of a concave shape so as to be positioned on the cylindrical guide  13   a L shown in  FIGS. 19 and 20 . Also, the second positioning portion  92  is positioned relative to the slot  13   c  formed in the cleaning frame body  13 , and determines the mounting angle of the third disassembling tool  80  onto the cleaning frame  13 . 
   While in the foregoing, the positioning of the first positioning portion on the second plate  87  is effected relative to the cylindrical guide  13   a L, the positioning may be done anywhere if the first positioning portion on the second plate  87  can be fixed, and may be effected by the screws  29   a , as shown in  FIG. 19 . Also, the second positioning portion  92  may be provided at any location at which the angle of the disassembling tool is determined, and may be provided in a blank portion F between ribs. 
   While in the foregoing, the first positioning portion is of a concave shape and the second positioning portion is of a convex shape, it is also possible to select a concave shape or a convex shape in conformity with the shapes of the locations at which they are positioned. It is also possible for the third disassembling tool shown above to adopt the constructions shown in the fifth embodiment and the sixth embodiment. That is, the connecting bars can be provided with level difference portions, and an interval into which fingers can be put can be provided between the plates. Also, biasing means can be provided on the small-diametered portions of the connecting bars, whereby after the coupling pin has been pulled out, the plate can be returned to the level difference portions by the biasing means to thereby always maintain a prescribed minimum interval. 
   A description will now be provided of a method of disassembling the cartridge P by the use of the above-described third disassembling tool  80 . 
   Disassembling Method 
   This disassembling method is carried out in a manner similar to the disassembling methods using the aforedescribed first disassembling tool  60  and second disassembling tool  70 . The first pushing-out portion  83  is inserted into the interior of the cartridge through the exposure opening portion  2  provided in the cleaning frame body  13  by rotating the tool. Thereafter, the first positioning portion  81  and the second positioning portion  82  are positioned by the convex portion  37   a  provided on one end of the photosensitive drum  10  being fitted into the slot  13   b  formed in the cleaning frame body  13 . Thereafter, the second plate  87  is slid, whereby the pushing-out portion  83  destroys the bag hole bottom  32   b  provided in the cleaning frame body  13 . The coupling pin  50  is pushed out of the cartridge P through the pin discharging port  84   a  provided in the first plate  84 . Subsequently, the second pushing-out portion  93  is inserted into the interior of the cartridge through the exposure opening portion  2  in the lengthwisely opposite side of the cartridge while the tool is rotated. 
   Thereafter, the first positioning portion on the second plate  87  and the second positioning portion  92  are positioned by the cylindrical guide  13   a L provided on the other end of the photosensitive drum  10  being fitted into the slot  13   c  formed in the cleaning frame body  13 . Thereafter, in the same manner as described above, the coupling pin  50  is pushed out of the cartridge P. Also, while in the above-described embodiments, the pin discharging ports  84   a  and  87   a  are provided, the pin discharging ports  84   a  and  87   a  need not be provided if as shown in  FIGS. 25A and 25B , the tip end of the pushed-out coupling pin  50  is put outside the outer side plate B 2  of the photosensitive member unit and it is pulled out by a hand. 
   As has been described above, according to the present invention, the disassembling tool can be easily positioned relative to the process cartridge, and a coupling member for rotatably coupling a first frame and a second frame together can be reliably removed, and a process cartridge having the first frame and the second frame can be disassembled easily.