JP5471015B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus including a moving member movable with respect to an apparatus main body and a mechanism for transmitting a driving force from the apparatus main body to a passive member provided on the moving member.

  2. Description of the Related Art Conventionally, there has been known an image forming apparatus including a photosensitive drum that rotates while carrying a toner image, and a driving coupling that transmits a driving force to the photosensitive drum (see Patent Document 1). Specifically, with this technology, the drive coupling can be moved back and forth in the axial direction, so that it can be attached to and detached from the hole formed at the end of the photosensitive drum. The coupling and the photosensitive drum are engaged with each other in the circumferential direction and rotate integrally.

JP 2005-265951 A

  By the way, when the cartridge having the photosensitive drum is detachable from the apparatus main body, the cartridge may be mounted on the apparatus main body in a state where the central axis of the photosensitive drum and the central axis of the drive coupling are shifted. There is. In this case, in the above-described technique, even if the drive coupling enters the hole formed in the end portion of the photosensitive drum, the drive coupling is brought close to one side of the inner peripheral surface of the hole of the photosensitive drum and strongly driven. In some cases, force transmission was not performed well.

  Accordingly, the present invention provides a central axis of a passive member (for example, a photosensitive drum) that is rotatably provided on a moving member that is movable with respect to the apparatus main body, and a main body drive member (for example, drive coupling) that is rotatably provided on the apparatus main body. It is an object of the present invention to provide an image forming apparatus capable of satisfactorily transmitting a driving force even when the center axis is deviated.

  In order to solve the above problems, an image forming apparatus according to the present invention includes an apparatus main body, a movable member movable between a storage position in the apparatus main body, and a disengagement position outside the apparatus main body, and the apparatus main body. A main body driving member that is rotatably provided to the driving source and a driving force transmitted from a driving source, and a rotating shaft of the main body driving member that is rotatably provided to the moving member and is located at the storage position. The main body driving member is disposed between the main body driving member and the passive member in a rotational direction, and is disposed between the main body driving member and the passive member. A driving force transmission member that transmits a driving force from the passive member to the passive member, and the driving force transmission member is supported by the main body driving member so as to be movable in the direction of the rotation axis. The passive member The first connecting portion, which is a portion where the main body driving member and the driving force transmission member are engaged in the rotational direction, can be switched in a first radial direction orthogonal to the rotational axis direction. The second connecting portion that is engaged with each other so as to be movable, and the driving force transmitting member and the passive member are engaged in the rotational direction, the rotational axis direction and the first radial direction It is characterized by being engaged with each other so as to be movable in a second radial direction orthogonal to the two.

  According to the present invention, even when the center axis of the passive member and the center axis of the main body drive member are deviated, the first driving force transmitting member is engaged with the passive member and the main body drive member in an uneven manner. Since it can move in the radial direction or in the second radial direction orthogonal to the radial direction, the driving force transmission member transmits power to the passive member and the main body driving member while sliding as if it were an Oldham coupling. Therefore, the driving force can be transmitted from the main body driving member to the passive member through the driving force transmitting member.

  According to the present invention, the center axis of the passive member rotatably provided on the movable member movable relative to the apparatus main body and the center axis of the main body drive member rotatably provided on the apparatus main body are shifted. However, it is possible to satisfactorily transmit the driving force by the driving force transmitting member movable in the first radial direction and the second radial direction.

1 is a cross-sectional view illustrating an overall configuration of a color laser printer according to an embodiment of the present invention. It is sectional drawing which shows the state which pulled out the drawer from the apparatus main body. FIG. 4 is an exploded perspective view (a) of the driving force transmission mechanism as seen from the photosensitive drum side and an exploded perspective view (b) as seen from the main body driving gear side. It is sectional drawing (a) which cut the driving force transmission mechanism in the 1st radial direction, and sectional drawing (b) cut in the 2nd radial direction. (A), (b) is explanatory drawing which shows a detachment mechanism simply. They are a top view (a) showing a state where the coupling is not pushed by the cam, and a top view (b) showing a state where the coupling is pushed by the cam. (A), (b) is a disassembled perspective view which shows the modification of the connection part of a coupling and a photosensitive drum.

  Next, an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the following description, first, an overall configuration of a color laser printer as an example of an image forming apparatus according to an embodiment will be briefly described with reference to FIG. 1, and thereafter, characteristic portions of the present invention will be described in detail.

<Overall configuration of color laser printer>
As shown in FIG. 1, the color laser printer 1 includes a paper feeding unit 30 that supplies a recording sheet SH into the apparatus main body 2 and an image that forms an image on the recording sheet SH fed from the paper feeding unit 30. A forming unit 40 and a paper discharge unit 50 that discharges the recording sheet SH on which an image is formed by the image forming unit 40 from the apparatus main body 2 are provided.

  Note that the vertical, horizontal, and front-back directions indicated by arrows in FIG. 1 are directions viewed from a person standing in front (front side) of the color laser printer 1. Unless otherwise specified, the directions are in accordance with the directions indicated by arrows in FIG.

  An opening 2A for attaching / detaching a drawer 45 as an example of a moving member to be described later is formed on the front wall of the apparatus main body 2, and a front cover 21 for opening and closing the opening 2A is swingably provided. ing.

  The paper feed unit 30 includes a paper feed tray 31 that can be attached to and detached from the apparatus main body 2, and a paper supply mechanism 32 that conveys the recording sheet SH from the paper feed tray 31 to the image forming unit 40. The paper supply mechanism 32 has a known paper feed roller, separation roller, separation pad, etc. (reference numerals omitted), separates the recording sheets SH in the paper feed tray 31 one by one, and conveys them to the upper image forming unit 40. To do.

  The image forming unit 40 includes a scanner unit 41, a process unit 42, a transfer unit 43, and a fixing unit 44.

  Although not shown, the scanner unit 41 includes a laser light emitting unit, a polygon mirror, a plurality of lenses, and a reflecting mirror. The scanner unit 41 irradiates each photosensitive drum 47 </ b> A of the process unit 42 with laser light corresponding to each color of cyan, magenta, yellow, and black.

  The process unit 42 includes a drawer 45 that is disposed between the scanner unit 41 and the transfer unit 43 and is detachably attached to the apparatus main body 2. The drawer 45 is movable between a storage position (position in FIG. 1) in the apparatus main body 2 and a disengagement position (position in FIG. 2) outside the apparatus main body 2 in a state where the front cover 21 is opened. Yes. In the drawer 45, four (plural) process cartridges 46 are arranged along the conveyance direction of the recording sheet SH.

  Each process cartridge 46 includes a drum subunit 47 disposed at a lower portion, a developing unit 48 that is detachably connected to the drum subunit 47, and a developer cartridge 49 that is detachably connected to the developing unit 48. ing.

  The drum subunit 47 includes a photosensitive drum 47A as an example of a passive member (photosensitive member), a scorotron charger (reference numeral omitted), and the like. The photosensitive drum 47A is rotatably supported by the drum subunit 47. That is, the photosensitive drum 47 </ b> A is indirectly supported by the drawer 45 via the drum subunit 47.

  The developing unit 48 includes a developing roller 48B, a supply roller 48A, and the like. The developer cartridge 49 contains non-magnetic one-component toner (developer) of each color of cyan, magenta, yellow, and black.

  In the process unit 42 configured as described above, the surface of the photosensitive drum 47A charged by the scorotron charger is exposed by the laser light emitted from the scanner unit 41, so that the potential of the exposed portion is lowered. An electrostatic latent image based on the image data is formed on the photosensitive drum 47A. Further, the toner charged by the developing roller 48B in contact with the photosensitive drum 47A is supplied to the electrostatic latent image on the photosensitive drum 47A, whereby the toner image is carried on the photosensitive drum 47A.

  The transfer unit 43 includes a drive roller 43A, a driven roller 43B, a transport belt 43C, and a transfer roller 43D.

  The conveyor belt 43C is disposed to face the plurality of photosensitive drums 47A. The conveyor belt 43C is rotationally driven together with the driven roller 43B by the rotational driving of the driving roller 43A. Inside the transport belt 43C, a transfer roller 43D that sandwiches the transport belt 43C with each photosensitive drum 47A is disposed. A transfer bias is applied to the transfer roller 43D from a high voltage substrate (not shown).

  In the transfer unit 43, when the recording sheet SH conveyed by the conveying belt 43C is supplied between the photosensitive drum 47A and the transfer roller 43D, the toner image on the photosensitive drum 47A is transferred to the recording sheet SH.

  The fixing unit 44 includes a heating roller 44A and a pressure roller 44B. The fixing unit 44 heats and fixes the toner image on the recording sheet SH by feeding the recording sheet SH while sandwiching it between the heating roller 44A and the pressure roller 44B.

  The paper discharge unit 50 has a plurality of conveyance rollers (reference numerals omitted), and conveys the recording sheet SH discharged from the fixing unit 44 to the upper paper discharge tray 53.

<Mechanism for transmitting driving force to photosensitive drum>
Next, a driving force transmission mechanism to the photosensitive drum 47A, which is a characteristic part of the present invention, will be described.

  As shown in FIG. 3A, the driving force transmission mechanism 60 that transmits the driving force to the photosensitive drum 47A includes a driving source 61 such as a motor, a main body driving gear 62 as an example of a main body driving member, and an urging member. A coil spring 63 as an example and a coupling 64 as an example of a driving force transmission member.

  The drive source 61 is provided at an appropriate position of the apparatus main body 2 and is connected to the main body drive gear 62 directly or via a predetermined number of gears to indirectly transmit the drive force to the main body drive gear 62. .

  The main body drive gear 62 is rotatably provided in the apparatus main body 2 and mainly includes a gear portion 62A to which the driving force 61 is transmitted from the drive source 61 and the center portion of the gear portion 62A toward the coupling 64. And a protruding portion 62B that protrudes. A pair of first recesses 62 </ b> C are provided on the outer peripheral surface of the projecting portion 62 </ b> B so as to face each other across the rotation axis along the rotation axis direction of the main body drive gear 62. In addition, a pair of recessed part 62D formed between each 1st recessed part 62C among the outer peripheral surfaces of the protrusion part 62B is formed in consideration of the symmetry (rotation balance of the main body drive gear 62) for a gear precision improvement. It is a concave part.

  Then, at the end of each first recess 62C on the coupling 64 side, as shown in FIG. 4A, a locking rib 62E as an example of a locking portion protruding outward in the radial direction of the main body drive gear 62. Are formed respectively.

  The coil spring 63 is disposed between the main body drive gear 62 and the coupling 64, and urges the main body drive gear 62 and the coupling 64 in a direction away from each other.

  As shown in FIGS. 3A and 3B, the coupling 64 is disposed between the main body driving gear 62 and the photosensitive drum 47A, and is engaged with the main body driving gear 62 and the photosensitive drum 47A in the rotational direction. As a result, the driving force is transmitted from the main body driving gear 62 to the photosensitive drum 47A. Specifically, the coupling 64 mainly includes a cylindrical portion 64A into which the protruding portion 62B of the main body driving gear 62 enters, and a wall 64B facing the photosensitive drum 47A by closing the end portion of the cylindrical portion 64A on the photosensitive drum 47A side. Have.

  An annular flange 64C extending radially outward is formed on the outer peripheral surface of the cylindrical portion 64A, and the annular flange 64C and the gear portion 62A of the main body drive gear 62 are pressed away by the coil spring 63 described above. ing.

  A pair of first convex portions 64D along the rotation axis direction are provided on the inner peripheral surface of the cylinder portion 64A so as to face each other across the rotation axis. The first convex portion 64D engages with the first concave portion 62C in the rotational direction in a state where the first convex portion 64D enters the first concave portion 62C of the main body drive gear 62. That is, in the present embodiment, the first connecting portion is configured by the first convex portion 64D and the first concave portion 62C.

  The first convex portion 64D is movable in the rotation axis direction with respect to the first concave portion 62C. In other words, the coupling 64 is supported by the main body drive gear 62 so as to be movable in the direction of the rotation axis, whereby the connection / disconnection between the coupling 64 and the photosensitive drum 47A can be switched.

  Further, a locking claw 64E as an example of a locking portion protruding inward in the radial direction is formed at the end of each first convex portion 64D on the main body drive gear 62 side. As shown in FIG. 4A, each locking claw 64E can be engaged with each locking rib 62E of the main body drive gear 62 in the rotation axis direction, whereby the coupling 64 is photosensitive. Movement to the drum 47A side (removal from the main body drive gear 62) is restricted.

  Further, when the cylindrical portion 64A and the protruding portion 62B of the main body driving gear 62 are fitted to each other, a gap is formed in the direction in which the two first convex portions 64D are arranged (hereinafter referred to as “first radial direction”). It is configured. Further, a gap is also formed between the tip of each locking claw 64E and the bottom surface of each first recess 62C of the main body driving gear 62. Thereby, the coupling 64 is movable in the first radial direction with respect to the main body drive gear 62.

  As shown in FIG. 3A, a pair of second convex portions 64F projecting toward the photosensitive drum 47A are provided on the wall 64B so as to face each other with the rotation axis therebetween. Specifically, each of the second convex portions 64F is disposed so as to be opposed to each other in a second radial direction orthogonal to the first radial direction and the rotation axis direction, and each of the second convex portions 64F is formed in a cylindrical shape having a rounded tip. Yes. Also, a hole 64G is formed in the center of the wall 64B, so that when the coupling 64 moves in a direction approaching the main body drive gear 62, a shaft that rotatably supports the main body drive gear 62 (see FIG. (Not shown) and the wall 64B are prevented from interfering with each other.

  As shown in FIG. 3B, at the end of the photosensitive drum 47A, four second recesses A1 that can be engaged with the second protrusions 64F of the coupling 64 are formed so as to be shifted by 90 ° from each other. ing. Then, in a state where the pair of second convex portions 64F enters the pair of second concave portions A1, the second convex portions 64F and the second concave portions A1 are engaged in the rotation direction. That is, in this embodiment, the 2nd convex part 64F and 2nd recessed part A1 comprise the 2nd connection part.

  Moreover, each 2nd recessed part A1 is formed in the groove shape along a radial direction, respectively. Accordingly, as shown in FIG. 4B, in a state where the pair of second convex portions 64F enters the pair of second concave portions A1, the coupling 64 is in the second radial direction (the pair of pairs) with respect to the photosensitive drum 47A. In the direction in which the second convex portions 64F are arranged).

  Further, as shown in FIGS. 3A and 3B, the apparatus main body 2 has a detaching mechanism 70 for detaching the coupling 64 from the photosensitive drum 47A by pushing the coupling 64 toward the main body driving gear 62. Is provided. 5A, the detachment mechanism 70 includes four cams 71, a support arm 72 that supports each cam 71, and a connection arm 73 that connects the support arm 72 and the front cover 21. It has. In FIG. 5, for convenience, the cam 71 is indicated by dot hatching.

  As shown in FIG. 6A, the cam 71 has an inclined surface 71A that inclines to the left as it goes rearward. In a direction perpendicular to the direction).

  Then, as shown in FIGS. 5A and 5B, when the user opens the front cover 21, the connecting arm 73 and the support arm 72 are pulled forward in conjunction with the opening operation of the front cover 21. The cam 71 moves forward. 6B, the annular flange 64C of the coupling 64 is pushed against the urging force of the coil spring 63 by the inclined surface 71A of the cam 71, and the coupling 64 comes off from the photosensitive drum 47A. The drawer 45 can be pulled out.

  Further, when the drawer 45 is mounted on the apparatus main body 2 by moving the drawer 45 from the disengagement position described above, each photosensitive drum 47A supported by the drawer 45 faces each coupling 64 in the rotation axis direction. In this state, as shown in the order of FIGS. 5B and 5A, when the front cover 21 is closed, the couplings 64 held by the cams 71 are changed as shown in FIG. 6A. The coil spring 63 is moved to the right side by the urging force of the coil spring 63 and is connected to each photosensitive drum 47A.

  At this time, even if the central axis of the photosensitive drum 47A and the central axis of the main body driving gear 62 are deviated, the first radial direction in a state where the coupling 64 is engaged with the photosensitive drum 47A and the main body driving gear 62 in the rotational direction. In addition, since it can move in the second radial direction perpendicular to this, the coupling 64 transmits power to the photosensitive drum 47 </ b> A and the main body drive gear 62 while sliding with respect to the photosensitive drum 47 </ b> A like an Oldham coupling. Therefore, the driving force can be transmitted from the main body driving gear 62 to the photosensitive drum 47A through the coupling 64.

In the present embodiment, the following effects can be obtained in addition to the effects described above.
By providing the first concave portion 62C and the first convex portion 64D on the outer peripheral surface of the protruding portion 62B of the main body driving gear 62 and the inner peripheral surface of the cylindrical portion 64A of the coupling 64, the first concave portion 62C and the first convex portion 64D. Can be covered with the cylindrical portion 64A, and it is possible to suppress the accumulation of dust between the first concave portion 62C and the first convex portion 64D and the deterioration of the slidability.

  The first concave portion 62C is formed on the outer peripheral surface of the projecting portion 62B of the main body driving gear 62, and the first convex portion 64D is formed on the inner peripheral surface of the cylindrical portion 64A of the coupling 64. Compared with a structure in which a convex portion is formed on the outer peripheral surface and a concave portion is formed on the inner peripheral surface of the cylindrical portion, the root portion of the convex portion can be positioned radially outward. Here, since the force applied to the root portion of the convex portion is calculated by torque / radius, the force applied to the root portion becomes smaller as the root portion of the convex portion is positioned on the radially outer side. Therefore, in the embodiment, since the force applied to the root portion of the first convex portion 64D can be reduced compared to the reverse structure as described above, the first convex portion 64D is difficult to deform, and the two parts The accuracy of the engaging portion can be maintained, and a constant driving force can always be transmitted. Moreover, it can also suppress that the 1st convex part 64D breaks because the force concerning the base part of 1st convex part 64D becomes small.

  Since the coil spring 63 that urges the coupling 64 in a direction away from the main body drive gear 62 is provided, the coupling 64 is exposed to light only by providing the apparatus main body 2 with a cam 71 that pushes the coupling 64 toward the main body drive gear 62. The drum 47A can be advanced and retracted. That is, it is not necessary to separately provide a mechanism for separating the coupling 64 from the main body drive gear 62 in the apparatus main body 2, so that the apparatus can be simplified.

  Since the locking rib 62E provided on the main body drive gear 62 and the locking claw 64E provided on the coupling 64 restrict the movement of the coupling 64 toward the photosensitive drum 47A, the main body is applied by the biasing force of the coil spring 63. It is possible to prevent the coupling 64 from being detached from the drive gear 62.

In addition, this invention is not limited to the said embodiment, It can utilize with various forms so that it may illustrate below.
In the above-described embodiment, the photosensitive drum 47A is employed as the passive member. However, the present invention is not limited to this, and may be, for example, a developing roller. However, when a photosensitive drum is employed as the passive member, even if the axial center is shifted, a plurality of photosensitive drums can always be rotated at a constant rotational speed, so that color misregistration and the like can be prevented.

  In the above-described embodiment, the convex portion (second convex portion 64F) provided on the driving force transmission member (coupling 64) has a cylindrical shape with rounded tips, but the present invention is not limited to this, and the two convex portions. May be formed in different shapes. For example, as shown in FIG. 7A, one convex portion 81 may be formed in a plate shape with a rounded tip, and the other convex portion 82 may be formed longer than the convex portion 81 in the radial direction.

  In this case, as shown in FIG. 7B, only one concave portion 84 that is long in the radial direction is formed on the end surface of the photosensitive drum 83 so as to be engageable with the other convex portion 82 described above. . The remaining three concave portions 85 are formed shorter in the radial direction than the concave portion 84 so that the other convex portion 82 described above cannot be engaged and the one convex portion 81 described above can be engaged.

  According to this, since the other convex part 82 always engages with the concave part 84, the photosensitive drum 83 and the coupling 86 can always be engaged in the same direction (same phase) in the rotational direction. Even when 45 is attached or detached, the phases of the plurality of photosensitive drums 83 can be always aligned. Since the photosensitive drum 83 and the coupling 86 are always engaged in the same direction as described above, it is possible to always adjust the accuracy of the photosensitive drum 83 and the coupling 86 (such as a certain relationship). Therefore, accurate print control can be easily performed, and high image quality can be achieved.

  In the above-described embodiment, the main body driving gear 62 is used as the main body driving member. However, the present invention is not limited to this. For example, a roller that wraps around the belt and transmits the driving force from the belt may be used. Good.

  In the above embodiment, the main body driving member (main body driving gear 62) is provided with the concave portion (first concave portion 62C), and the driving force transmitting member (coupling 64) is provided with the convex portion (first convex portion 64D). The invention is not limited to this, and the main body driving member may be provided with a convex portion, and the driving force transmitting member may be provided with a concave portion. In contrast to the above-described embodiment, the driving force transmission member may be provided with a recess, and the protrusion that engages with the recess may be provided on the passive member (photosensitive drum 47A). Further, contrary to the above-described embodiment, the main body driving member may be provided with a cylindrical portion, and the driving force transmitting member may be provided with a protruding portion.

In the above-described embodiment, the cam 71 is moved in the front-rear direction. However, the present invention is not limited to this. For example, the driving force transmission member may be pushed in the rotation axis direction by moving the cam in the up-down direction. .
In the above-described embodiment, the coil spring 63 is employed as the biasing member. However, the present invention is not limited to this, and for example, a wire spring or a disc spring may be employed.

  In the embodiment, the locking portions (locking ribs 62E and locking claws 64E) are provided on both the main body driving member (main body driving gear 62) and the driving force transmission member (coupling 64). However, the engaging portion may be provided on at least one of the main body driving member and the driving force transmitting member. For example, only a hook-shaped locking portion that extends from the main body drive member so as to penetrate the center of the drive force transmission member and contacts the end surface of the drive force transmission member on the passive member side may be provided.

In the above embodiment, the present invention is applied to the color laser printer 1, but the present invention is not limited to this, and the present invention may be applied to other image forming apparatuses such as a copying machine and a multifunction machine.
In the embodiment, the photosensitive drum 47A is used as the photosensitive member. However, the present invention is not limited to this, and for example, a belt-shaped photosensitive member may be used.

DESCRIPTION OF SYMBOLS 1 Color laser printer 2 Apparatus main body 2A Opening part 21 Front cover 45 Drawer 47A Photosensitive drum 60 Driving force transmission mechanism 61 Drive source 62 Main body drive gear 62B Protrusion part 62C 1st recessed part 62E Locking rib 63 Coil spring 64 Coupling 64A Tube part 64B Wall 64D 1st convex part 64E Locking claw 64F 2nd convex part 70 Separation mechanism 71 Cam 72 Support arm 73 Connection arm A1 2nd recessed part

Claims (7)

The device body;
A movable member movable between a storage position in the apparatus main body and a disengagement position outside the apparatus main body,
A main body driving member that is rotatably provided in the apparatus main body and transmits a driving force from a driving source;
A passive member that is rotatably provided on the moving member and faces the main body driving member in the rotation axis direction of the main body driving member when the moving member is located at the storage position;
Driving force transmission disposed between the main body driving member and the passive member, and transmitting driving force from the main body driving member to the passive member by engaging the main body driving member and the passive member in a rotational direction. A member, and
The driving force transmission member is supported by the main body driving member so as to be movable in the direction of the rotation axis, so that connection / disconnection between the driving force transmission member and the passive member can be switched,
The first connection portion, which is a portion where the main body driving member and the driving force transmission member are engaged in the rotation direction, is engaged with each other in an uneven manner so as to be movable in a first radial direction orthogonal to the rotation axis direction. Together
The second connecting portion, which is a portion where the driving force transmitting member and the passive member are engaged in the rotational direction, is movable in a second radial direction orthogonal to the rotational axis direction and the first radial direction. Are engaged with each other in a concavo-convex manner ,
One of the main body driving member and the driving force transmission member is provided with a protruding portion that protrudes toward the other, and the other is provided with a cylindrical portion into which the protruding portion enters,
The projecting portion and the tubular portion are configured to have a gap in the first radial direction when fitted to each other,
The first connecting portion is an unevenness provided on the outer peripheral surface of the protruding portion and the inner peripheral surface of the cylindrical portion,
The main body drive member is provided with the protrusion,
The driving force transmission member is provided with the cylindrical portion,
A first recess along the rotation axis direction is provided on the outer peripheral surface of the protrusion;
The 1st convex part along the said rotating shaft direction is provided in the internal peripheral surface of the said cylinder part.
Image forming apparatus characterized by. The driving force transmission member has a wall facing the passive member by closing an end portion of the cylindrical portion on the passive member side,
The second connecting portion is configured by a second convex portion provided on one of the wall and the passive member, and a second concave portion provided on the other and engaged with the second convex portion. The image forming apparatus according to claim 1 . 3. The image according to claim 1, further comprising: a detaching mechanism that detaches the driving force transmitting member from the passive member by pushing the driving force transmitting member toward the main body driving member. Forming equipment. An opening formed in the apparatus main body for moving the moving member from the storage position to the disengagement position;
A cover for opening and closing the opening,
The detachment mechanism is
It has a cam that moves in a direction perpendicular to the rotation axis direction in conjunction with the opening operation of the cover, and is configured to push the driving force transmission member toward the main body driving member with the cam. The image forming apparatus according to claim 3 . Between the main body driving member and the driving force transmission member, a biasing member for biasing the main body driving member and the driving force transmission member in a direction away from each other is provided.
Wherein at least one of the body drive member and said driving force transmission member according to claim 3 wherein the driving force transmitting member, characterized in that the locking portion is provided for restricting the movement to the passive member side or The image forming apparatus according to claim 4 .   6. The image forming apparatus according to claim 5, wherein the driving force transmission member is provided with a flange portion that contacts the urging member on one surface and contacts the separation mechanism on the other surface. apparatus. The passive member, the image forming apparatus according to any one of claims 1 to 6, characterized in that the photosensitive member on which an electrostatic latent image is formed.

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