JP2005250002A - Locking mechanism and developing device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve an operability of attaching/detaching a developing device to/from an image forming apparatus, and to improve an operability of attaching/detaching a toner cartridge to/from the developing apparatus main body. <P>SOLUTION: A disk-like locking plate 70 is arranged on the left plate 41a of a cartridge holding container 40 so that the plate 70 can freely rotate around a center axis 72, and the locking mechanism 60 is arranged, by which an operation of locking/releasing the developing apparatus body 30 to/from a facsimile apparatus 10 and an operation of locking/releasing the toner cartridge 50 to/from the cartridge holding container 40 can be selectively performed by rotating the disk-like locking plate 70 around the center axis 72 with one operation of the plate 70. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lock mechanism suitable for use in a copying machine, a facsimile machine, and a developing device used in an image forming apparatus such as various printers, and a developing device to which this mechanism is applied.

  A developing device is applied to an image forming apparatus such as a copying machine, a facsimile machine, and various printers. The developing device supplies toner toward an electrostatic latent image formed on the peripheral surface of the photosensitive drum to form a toner image. The developing device stirs the toner and the peripheral surface of the photosensitive drum. A developing device main body having a developing roller or the like for supplying toner thereto, and a toner cartridge that is detachably attached to the developing device main body and replenishes the toner to the developing device main body.

  The developing device main body is detachably attached to a predetermined frame of the device main body of the image forming apparatus, and the toner cartridge is detachably attached to the developing device main body attached to the frame of the device main body from above. There is something that is.

As such a structure for attaching and detaching the developing device, those described in, for example, Patent Document 1 and Patent Document 2 are known.
Japanese Patent No. 3273723 Japanese Examined Patent Publication No. 6-95245

  By the way, in the conventional developing device as described above, the locking and unlocking operation of the developing device main body with respect to the device main body frame and the locking and unlocking operation of the toner cartridge with respect to the developing device main body are performed separately. Because it is very troublesome.

  The present invention has been made to solve such problems, and includes a lock and unlock operation when the developing device main body is attached to and detached from the device main body, and a toner cartridge lock and unlock operation with respect to the developing device main body. Provided are a lock mechanism that can be selectively performed with a single touch, thereby ensuring good detachability of the developing device main body and the toner cartridge with respect to the apparatus main body, and a developing device to which this mechanism is applied. The purpose is that.

  According to the first aspect of the present invention, a second device body in which an attachment is attached to a second attachment portion having a second partition wall is attached to the first attachment portion of the first device body having the first partition wall. A locking mechanism for locking, wherein the second partition wall is provided with a rotary lock plate facing one side wall of the attachment, and the lock plate is provided with a first engagement portion. On the other hand, a second engagement portion that engages with the first engagement portion is provided on one side surface of the attachment, and the second engagement portion engages with the first engagement portion, thereby An attachment is attached to the second attachment portion of the second device body, and the first partition wall is provided with a third engagement portion, while the lock plate corresponds to the third engagement portion. A fourth engagement portion is provided, and the fourth engagement portion is connected to the third engagement portion by a rotation operation of the lock plate. The second device main body is prevented from coming off from the first mounting portion of the first device main body due to the interference, while the retaining is released by avoiding interference with the third engaging portion by the rotation operation of the lock plate. It is characterized in that the shape is set in such a manner.

  1A and 1B are explanatory views conceptually showing a locking mechanism according to the present invention. FIG. 1A shows the invention of claim 1 and FIG. 1B shows the invention of claim 2, respectively. First, the lock mechanism 100 according to claim 1 has a second partition wall 104 in the first mounting portion 103 of the first device body 101 having the first partition wall 102 as shown in FIG. The second device main body 105 with the attachment 107 attached to the second attachment portion 106 is attached and locked.

  The second partition wall 104 has a rotary lock plate 109 facing the one side wall 108 of the attachment 107 (in the example shown in FIG. (Supported rotatably around a support shaft 109a protruding from the two partition walls 104).

  The lock plate 109 is provided with a mounting groove (first engaging portion) 114 extending from the peripheral surface to the center of rotation, and on one side of the mounting object 107, a fitting protrusion (first projection) fitted into the mounting groove 114. 2 engaging portion) 115 is provided. The fitting 107 is fitted to the second mounting portion 106 of the second device main body by fitting the fitting protrusion 115 into the rotation center of the fitting groove 114.

  The first partition wall 102 is provided with a third engagement portion 110, while the lock plate 109 is provided with a fourth engagement portion 111 corresponding to the third engagement portion 110. The fourth engagement portion 111 prevents the second device main body 105 from being detached from the first attachment portion 103 of the first device main body 101 due to interference with the third engagement portion 110 due to the rotation operation of the lock plate 109. On the other hand, the shape is set so that the retaining is released by avoiding the interference with the third engaging portion 110 by the turning operation of the lock plate 109.

  According to the lock mechanism 100 according to claim 1 having such a configuration, the fitting 107 is inserted into the fitting groove 114 of the lock plate 109 so that the fitting protrusion 115 is located at the innermost part of the fitting groove 114. It is in a state of being attached to the second device main body 105 at the position (the rotation center position of the lock plate 109). By rotating the lock plate 109 in a predetermined direction with one touch in a state where the second device main body 105 with the attachment 107 attached is attached to the first mounting portion 103 of the first device main body 101, FIG. 4A, the fourth engagement portion 111 of the lock plate 109 interferes with the third engagement portion 110 of the first device main body 101, and the second device main body 105 is prevented from coming off from the first device main body 101. (Ie locked).

  Next, in addition to the structure of the lock mechanism 100 of the first aspect, the lock mechanism 100 ′ according to the second aspect shown in FIG. 1B is provided with a fourth engagement portion 111 of the lock plate 109. A first ridge 112 is provided on a surface opposite to the surface on which the first ridge 112 is provided, while a second ridge 113 is provided on the attachment 107 so as to face the first ridge 112. The first and second ridges 112 and 113 are respectively set so that the attachment 107 is locked to the second mounting portion 106 due to mutual interference caused by the rotation of the lock plate 109.

  According to the lock mechanism 100 according to claim 2 configured as described above, the lock plate 109 can be directed in a predetermined direction with a single touch while the attachment 107 is attached to the second mounting portion 106 of the second device main body 105. By rotating, the first ridge 112 of the lock plate 109 and the second ridge 113 of the attachment 107 interfere with each other, and thereby the attachment state of the attachment 107 to the second device body 105 is locked. The

  And by setting appropriately the relative interference phase of the 1st and 4th engaging parts 110 and 111 and the relative interference phase of the 1st and 2nd protruding item | line 112,113 in the state mutually shifted, it is 2nd When the device main body 105 is locked to the first device main body 101, the second device main body can be operated by one-touch operation of the lock plate 109, such as the attachment 107 can only be locked and unlocked with respect to the second device main body 105. It is possible to cope with various modes of attaching and detaching 105 and the attachment 107.

  In FIG. 1, the mounting groove 114 that is recessed from the peripheral surface of the lock plate 109 to the center position as the first engaging portion, and the fitting protrusion that is fitted into the mounting groove 114 as the second engaging portion. 115 is taken as an example, but the mounting groove 114 is not limited to extending from the peripheral surface of the lock plate 109 to the center position, and may be recessed from the peripheral surface to the middle. On the contrary, the fitting protrusion may be provided on the lock plate 109 side, and the attachment groove may be provided on the attachment 107 side. Furthermore, the mounting groove 114 is not limited to being provided from the peripheral surface of the lock plate 109 toward the center position, and may be extended obliquely with respect to the radial direction from the peripheral surface.

  The invention according to claim 3 is a developing device to which the lock mechanism according to claim 1 or 2 is applied, wherein the first device main body is a device main body of an image forming apparatus, and the second device main body is A developing device main body for supplying toner to a photosensitive drum, which is detachably mounted on a device main body of the image forming apparatus, and the mounted object is a toner cartridge which is detachably mounted on the developing device main body. It is characterized by.

  By adopting such a configuration, the same effects as in the first and second aspects of the invention can be obtained with regard to locking and unlocking of the developing device with respect to the apparatus main body of the image forming apparatus and locking and unlocking of the toner cartridge with respect to the developing device. .

  According to a fourth aspect of the present invention, in the third aspect of the invention, the developing device main body detachably attached to the device main body of the image forming apparatus, and the toner replenishment detachably attached to the developing device main body. The developing device main body includes a cartridge holding container having an upper surface opening for attaching and detaching the toner cartridge, while the toner cartridge is in a stable state in the cartridge holding container. A lock plate is provided on one side of the opposite wall surface in the longitudinal direction of the cartridge holding container so as to be rotatable around a support shaft, and the developing device main body is locked and locked to the device main body. Unlocking operation and locking and unlocking operation of the toner cartridge with respect to the cartridge holding container Locking mechanism to be selectively carried out by the support axis of rotation operation by one touch of the lock plate is characterized in that is provided.

  By adopting such a configuration, the locking and unlocking operation of the developing device main body with respect to the device main body and the locking and unlocking operation of the toner cartridge with respect to the current feeding device main body can be performed around the support shaft of the lock plate. It can be selectively performed by a one-touch rotation operation.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the lock mechanism is recessed on a surface of the lock plate that faces the other side of the opposed wall surface, and the shaft of the support shaft extends from a peripheral surface. A mounting groove extending to a position including the center, a front-side arc-shaped ridge having a curvature center at a rotation center of a lock plate protruding from a surface facing one side of the opposite wall surface, and protruding from the toner cartridge, And an insertion protrusion that fits into the mounting groove, and an apparatus body side protrusion that protrudes from the first apparatus body toward the upper position of the lock plate, and the arc protrusion has one end. The portion is set at a position overlapping the mounting groove.

  According to such a configuration, when the developing device is mounted on the apparatus main body, the posture may be set to a non-interfering posture in which the front-side arc protrusion does not interfere with the apparatus main body-side protrusion by the rotation operation of the lock plate. By doing so, the developing device can eliminate the interference of the front-side arc protrusion provided on the lock plate with the apparatus main body side protrusion, and can perform the attaching / detaching operation with respect to the apparatus main body. Then, when locking the developing device mounted on the apparatus main body, the lock plate may be set in such a position that the front-side arc ridge interferes with the apparatus main body-side protrusion by rotating the lock plate.

  Further, when the toner cartridge is attached to and detached from the cartridge holding container of the developing device with the developing device main body mounted on the apparatus main body, the direction of the mounting groove of the lock plate is determined by rotating the lock plate. May be directed in the direction of attaching / detaching. By doing so, the toner cartridge can be guided in the mounting groove extending in the mounting direction of the lock plate, thereby being detachable from the cartridge holding container. Then, when locking the toner cartridge to the cartridge holding container, the lock plate may be rotated so that the mounting groove is inclined with respect to the attaching / detaching direction of the toner cartridge.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, a shaft support portion facing the support shaft is provided on the other side of the opposed wall surface of the cartridge holding container. It is comprised so that it can be supported by a shaft support part, and the surface on the opposite side to the surface in which the front side arc ridge of the lock plate is provided corresponds to the front side arc ridge, and has the same center of curvature. While a back-side arc ridge is provided, an interference protrusion that interferes with the back-side arc ridge is provided above the insertion protrusion in the toner cartridge, and the back-side arc ridge extends in a circumferential direction from the mounting groove. The mounting groove has an inclined surface that gradually increases as it moves away, and the mounting groove is provided with a locking piece that prevents relative rotation of the insertion protrusion by interference with the insertion protrusion. What to do That.

  In this way, the locking mechanism is configured to include the back-side arc ridges provided on the lock plate and the interference protrusions that interfere with the back-side arc ridges, and the arc ridges are spaced apart from the mounting grooves in the circumferential direction. In addition, the mounting groove has an inclined surface that gradually increases, and the mounting groove is provided with a locking piece that prevents relative rotation of the insertion protrusion by interference with the insertion protrusion. The toner cartridge is pressed against the inclined surface of the arc ridge by rotating the lock plate around the support shaft in the direction in which the back arc ridge interferes with the interference protrusion after being fitted in the toner cartridge. As a result, the inside of the cartridge holding container moves toward the shaft support portion and is supported by the shaft support portion of the cartridge holding container. It is retaining, whereby the lock on the cartridge holding container of the toner cartridge is performed.

  Further, when removing the toner cartridge from the cartridge holding container, the lock plate may be rotated around the support shaft in the direction opposite to that at the time of mounting. By doing so, the interference protrusion is released from the inclined surface of the back-side arc ridge, and the toner cartridge is detached from the shaft support portion, and the mounting groove faces in the direction of extracting the toner cartridge. Therefore, the toner cartridge can be removed from the cartridge holding container in a state where leakage of toner is prevented.

  According to a seventh aspect of the invention, in the sixth aspect of the invention, the toner cartridge is provided with a shutter that is opened when the toner cartridge is mounted on the developing device main body, and the shutter is a cartridge holding container of the toner cartridge. The lock mechanism is linked with the lock mechanism so that the lock mechanism is opened by a lock operation and closed by a lock release operation.

  By adopting such a configuration, the shutter provided in the toner cartridge is opened by the lock operation with respect to the cartridge holding container, and is closed by the lock release operation, so that the lock of the toner cartridge with respect to the developing device main body by the one-touch operation of the lock plate is performed. The unlocking and the opening / closing operation of the shutter are simultaneously performed.

  The invention according to claim 8 is the invention according to any one of claims 4 to 7, wherein the lock plate is provided with an operation lever for assisting a rotation operation of the lock plate. It is what.

  By adopting such a configuration, it becomes possible to rotate the lock plate around the support shaft by operating the operation lever, and the operability of the lock plate is improved.

  According to a ninth aspect of the present invention, in the invention according to any one of the fourth to eighth aspects, the toner cartridge is provided with a corresponding protrusion corresponding to the shaft supporting portion, and the shaft supporting portion has the corresponding protrusion. It is a recess or hole that can be fitted.

  By adopting such a configuration, the corresponding protrusion of the toner cartridge is simply fitted into the recess or hole of the cartridge holding container, so that the other end of the toner cartridge is securely held by the cartridge holding container, and the structure of the shaft support portion is simple. It will be something.

  According to the first aspect of the present invention, the lock plate is rotated by one-touch rotation in a predetermined direction with the second device main body mounted on the first mounting portion of the first device main body. Since the four engaging portions interfere with the third engaging portion of the first device main body and the mounting state of the second device main body with respect to the first device main body is locked, the second device main body of the second device main body can be locked by a complicated operation as in the past. There is no need to lock and unlock the first device body, thereby improving the maintainability of the first and second device bodies.

  According to the second aspect of the present invention, the lock plate is rotated by one-touch operation in a predetermined direction in a state in which the attachment is attached to the second attachment portion of the second device main body. Since the first ridge and the second ridge of the attachment interfere with each other, and the attachment state of the attachment to the second device main body is locked, the second device of the attachment by a complicated operation as before. There is no need to lock and unlock the main body, thereby improving the workability of the replacement work of the mounted object and the maintainability of the mounted object and the second device main body.

  According to the third aspect of the present invention, the same effects as those of the second aspect of the invention can be obtained with respect to locking and unlocking of the developing device with respect to the apparatus main body of the image forming apparatus and locking and unlocking of the toner cartridge with respect to the developing device. Can be obtained.

  According to the fourth aspect of the present invention, the locking and unlocking operation of the developing device main body with respect to the apparatus main body and the locking and unlocking operation of the toner cartridge with respect to the current feeding device main body are performed by the lock shaft support shaft Since it can be selectively performed by a one-touch turning operation around, the developing device main body can be locked and unlocked with respect to the apparatus main body, and the toner cartridge can be locked and unlocked with respect to the current feeding apparatus main body. Compared with the case where it has to be performed separately, the operability of the lock and unlock operations related to the developing device can be improved.

  According to the fifth aspect of the present invention, the lock mechanism includes a mounting groove provided in the lock plate, the arc ridge, the fitting protrusion provided in the toner cartridge, and an interference protrusion that interferes with the arc ridge. In addition, the arc ridge is provided with an inclined surface that gradually increases in projection as it moves away from the mounting groove in the circumferential direction, thus making the toner cartridge locking mechanism simple and one-touch. By the operation, the toner cartridge can be locked and unlocked with respect to the developing device main body, and the shutter can be opened and closed simultaneously.

  According to the sixth aspect of the present invention, the toner cartridge in the cartridge holding container is orthogonal to the lock plate by the interference of the interference protrusion with the back side arc convex line and the interference release by the forward / reverse rotation operation around the support shaft of the lock plate. Since the toner cartridge can be moved forward and backward in the direction, it is possible to engage and disengage the other end with respect to the cartridge holding container in addition to one end where the lock plate of the toner cartridge is provided. The toner cartridge can be locked more reliably by the one-touch rotation operation of the plate.

  According to the seventh aspect of the present invention, since the shutter provided in the toner cartridge is opened by the lock operation with respect to the cartridge holding container and is closed by the lock release operation, the toner cartridge developing device main body is operated by the one-touch operation of the lock plate. Thus, the operability of the attaching / detaching operation of the toner cartridge can be further improved because the shutter opening / closing operation and the shutter opening / closing operation are simultaneously performed, and it is not necessary to perform a separate operation for opening / closing the shutter.

  According to the invention described in claim 8, since the lock plate is provided with the operation lever for assisting the rotation operation of the lock plate, the lock plate is rotated around the support shaft by the operation of the operation lever. It becomes possible to operate, and the operability of the lock plate can be improved.

  According to the ninth aspect of the present invention, the toner cartridge is provided with a corresponding protrusion corresponding to the shaft support portion, and a recess or a hole into which the corresponding protrusion can be fitted is adopted as the shaft support portion. In addition, the toner cartridge can be securely attached to the cartridge holding container.

  FIG. 2 is an external perspective view showing an embodiment of a facsimile machine to which the developing device according to the present invention is applied, and FIG. 3 is an explanatory diagram for explaining the outline of the internal structure. As shown in these drawings, a facsimile apparatus (image forming apparatus) 10 includes a reading unit 1 for reading image information of a document placed on the upper part, and received image information arranged at a substantially central part of the apparatus main body. The image forming apparatus has a basic configuration including a transfer unit 2 formed on the sheet surface and a supply unit 3 that is disposed at the bottom of the apparatus main body and supplies the sheet to the transfer unit 2.

  The reading unit 1 includes a document table 5 on which a document is placed, a document transport unit 6 that transports a document, and a document discharge tray 7 that stores a document ejected from the document transport unit 6. . The document transport unit 6 is provided with an image information reading sensor 8 for reading image information of the document. An operation panel 9 having various keys and a display unit is disposed on the upper surface of the apparatus. Further, a handset 91 is disposed at the top of the apparatus.

  The transfer unit 2 includes an imaging unit 11 including a photosensitive drum 11a and the like, a developing device 20 that develops an electrostatic latent image formed on the photosensitive drum 11a with toner, and a toner formed on the photosensitive drum 11a. A transfer roller 12 for transferring the image onto the paper, a laser device 13 for forming an image corresponding to the received information on the surface of the photosensitive drum 11a of the imaging unit 11, and a toner image transferred onto the surface of the paper by the transfer roller 12. And a fixing conveyance device 14 for fixing the toner. A paper discharge tray 15 is provided on the downstream side of the fixing conveyance device 14.

  The sheet feeding unit 3 feeds a sheet from the sheet feeding cassette 16 that is detachably mounted through an opening provided in a side portion of the apparatus main body, and feeds the sheet from the sheet feeding cassette 16 to the transfer unit 2. A paper feeding device 17.

  The apparatus main body is divided into an upper case 10a and a lower case 10b. The upper case 10a is openable and closable with respect to the lower case 10b with a hinge 10c as a center. The reading unit 1 and the imaging unit 11, the developing device 20, and the laser device 13 of the transfer unit 2 are mounted on the upper case 10a, and the transfer roller 12 and the transfer unit 12 of the transfer unit 2 are mounted on the lower case 26. A fixing conveyance device 14 and a paper feed unit 3 are arranged.

  FIG. 4 is a partially cutaway exploded perspective view showing an embodiment of the developing device 20 according to the present invention. 5 to 7 are partially cut-away perspective views of the developing device 20 shown in FIG. 4, and FIG. 5 shows a state in which the disk-shaped lock plate 70 is set in the developing device locking posture, FIG. FIG. 7 shows a state in which the disc-like lock plate 70 is set in the toner cartridge locking posture, and FIG. 7 shows a state in which the disc-like lock plate 70 is set in the developing device unlocking posture. 8 is a cross-sectional view taken along line AA in FIG. 5, and FIG. 9 is a cross-sectional view taken along line BB in FIG. 4 to 9, the XX direction is referred to as the width direction, and the YY direction is referred to as the front-rear direction. In particular, the -X direction is leftward, the + X direction is rightward, the -Y direction is forward, and the + Y direction is forward. It is called the back.

  As shown in these drawings, the developing device 20 is detachably attached to the facsimile machine 10, and includes a developing device main body 30, a cartridge holding container 40 formed on the upper portion of the developing device main body 30, and A toner cartridge 50 that is detachably attached to the cartridge holding container 40, a lock of the toner cartridge 50 attached to the cartridge holding container 40, and a lock of the developing device 20 attached to the facsimile apparatus 10 are locked. It has a basic configuration with a locking mechanism 60 to perform.

  The developing device main body 30 supplies toner to the peripheral surface of the photosensitive drum 11a to form a toner image on the peripheral surface, and is arranged in parallel with the photosensitive drum 11a as shown in FIG. The housing 31 is long in the width direction, the developing roller 32 is provided at a front position in the housing 31, and the spiral feeder 33 is provided at a rear position of the developing roller 32.

  The developing roller 32 includes a roller shaft 321 provided between a pair of side walls 311 of the housing 31, and a roller body 322 made of an elastic material such as rubber that is concentrically and integrally fitted to the roller shaft 321. The toner in the housing 31 is transferred from the peripheral surface of the roller main body 322 to the peripheral surface of the photosensitive drum 11a while rotating around the roller shaft 321.

  The spiral feeder 33 includes a feeder shaft 331 installed between a pair of side walls 311 of the housing 31 and a spiral fin 332 screwed around the feeder shaft 331, and the spiral feeder 332 is provided around the feeder shaft 331. The toner in the developing device main body 30 is agitated by rotation, thereby destroying the toner agglomerates and making the toner particle size distribution uniform.

  The cartridge holding container 40 is for detachably mounting a toner cartridge 50 pre-filled with toner. The cartridge holding container 40 has a pair of side plates 41 (left side plate (first side plate) having the same shape and having a lower portion formed in an arc shape. Two partition walls 104) 41a and right side plate 41b), an arc bottom plate 42 having an arc shape in a side view provided between the arc edges of each side plate 41, and a front side installed between the front edges of each side plate 41 The plate 43 and a rear plate 44 provided between the rear edges of the side plates 41 are provided.

  In the present embodiment, an inclined plate inclined upward from the front edge portion of the arc bottom plate 42 is extended. In this inclined plate, the upper edge portion is integrally joined to the substantially central portion of the front plate 43 in the vertical direction, and an inclined plate similar to the previous period is provided from the rear edge portion of the arc bottom plate 42 toward the rear plate 44. As a result, the front and rear wall portions of the cartridge holding container 40 have a double structure from the substantially central position in the vertical direction, but the double structure is not particularly required.

  The left side plate 41a is provided with a curvature center hole 411 at the center of curvature of the arc bottom plate 42, and the upper part of the left side plate 41a is cut out in an arc shape with the center of curvature of the curvature center hole 411 as the center of curvature. A circular arc plate 412 is formed. The upper side of the arc plate 414 in the left side plate 41a is opened. In addition, a circular curvature center concave portion (shaft support portion) 413 that is opposed to the curvature center hole 411 in the width direction is provided on the inner surface side of the right side plate 41b.

  As shown in FIG. 4, a toner supply port 48 that is long in the width direction is provided at the left position of the arc bottom plate 42, and an opening / closing mechanism 45 that opens and closes the toner supply port 48 is provided. Yes. FIG. 10 is a cross-sectional view showing an embodiment of the opening / closing mechanism 45. (A) is a state where the gate member 46 is set at the closed position, and (B) is a position where the gate member 46 is set at the open position. Each state is shown.

  As shown in FIG. 10, the opening / closing mechanism 45 includes a gate member 46 that opens and closes the toner supply port 48 and a coil spring 47 that presses the gate member 46 toward the toner supply port 48. Yes. The gate member 46 protrudes upward from a slide plate 461 that slides in the front-rear direction on the front top plate 312 in the housing 31 of the developing device main body 30, and from the center portion of the slide plate 461 in the front-rear direction. And a rib 462 extending in the width direction (direction orthogonal to the paper surface of FIG. 10).

  On the other hand, the circular arc bottom plate 42 of the cartridge holding container 40 has an insertion window 421 through which the gate member 46 is inserted at the front position thereof. The slide plate 461 is connected to the front side of the gate member 46 through the insertion window 421. By moving forward and backward on the top plate 312 in the forward and backward direction, the position of the rear portion of the slide plate 461 can be changed between a closed position where the toner supply port 48 is closed and an open position where the toner supply port 48 is opened. It has become.

  When the toner cartridge 50 is not mounted in the cartridge holding container 40, the gate member 46 closes the toner supply port 48 by the urging force of the coil spring 47 as shown in FIG. On the other hand, when the toner cartridge 50 is mounted in the cartridge holding container 40, the arc bottom plate 52 of the toner cartridge 50 interferes with the rib 462 to resist the biasing force of the coil spring 47. By moving forward in the insertion window 421, the toner supply port 48 is opened as shown in FIG.

  According to the opening / closing mechanism 45, when the toner cartridge 50 is pushed into the cartridge holding container 40, the gate member 46 that has been closed is automatically opened, while the toner cartridge 50 is removed from the cartridge holding container 40. Thus, the gate member 46 is automatically closed by the biasing force of the coil spring 47, so that the toner supply port 48 is necessary when the gate member 46 is not opened and closed separately (that is, the toner in the toner cartridge 50 is removed from the cartridge holding container). The toner is always closed except when the toner is replenished into the toner supply 40, and the scattering of the toner from the developing device main body 30 through the toner supply port 48 is effectively prevented.

  The toner cartridge 50 is installed between a pair of side plates 51 (a left side plate (one side wall) 51a and a right side plate 51b) having the same shape and having a lower portion formed in an arc shape, and an arc edge portion of each side plate 51. An arc bottom plate 52 having an arc shape when viewed from the side, a front plate 53 laid between the front edges of each side plate 51, a rear plate 54 laid between the rear edges of each side plate 41, and the top opening are closed. The lid body 55 is configured to be provided. The lid 55 is fixed to the upper edge portions of the side plate 51, the front plate 53, and the rear plate 54 after the toner cartridge 50 is filled with toner.

  The radius of curvature of the arc portion of each side plate 51 is set to be slightly smaller than the radius of curvature of the arc portion of the side plate 41 of the cartridge holding container 40, whereby the toner cartridge 50 is placed in the cartridge holding container 40 in a substantially tight state. It can be inserted.

  The left side plate 51a is provided with a curvature center hole 511 corresponding to the curvature center hole 411 of the cartridge holding container 40 at the position of the center of curvature of the lower arc-shaped portion, and the right side plate. On the outer surface side of 51 b, a columnar protrusion 512 that protrudes in a sliding contact state with a curvature center concave portion 413 provided on the right side plate 41 b of the cartridge holding container 40 is projected. The columnar protrusion 512 is fitted into the curvature center concave portion 413 of the cartridge holding container 40 when the toner cartridge 50 is attached to the cartridge holding container 40.

  Further, at an appropriate position above the curvature center hole 511 in the left side plate 51a, an interference protrusion (second protrusion 113) protruding outward corresponding to a right circular arc protrusion 76 of a disc-like lock plate 70 described later. 57 is provided.

  Further, as shown in FIG. 4, a toner discharge port 56 that is long in the width direction corresponding to the toner supply port 48 of the cartridge holding container 40 is provided at the left position of the arc bottom plate 52. The toner inside is supplied to the developing device main body 30 through the toner discharge port 56 and the toner supply port 48.

  As shown in FIG. 4, the lock mechanism 60 includes a locking projection (third engagement portion 110) 181 protruding from the frame 18 toward the left side plate 41 a of the cartridge holding container 40, and the cartridge holding container 40. A disk-like lock plate (lock plate) 70 attached to the left side plate 41 a and a toner cartridge 50 are provided. The toner cartridge 50 is attached to the cartridge holding container 40, so that it is linked to the disk-like lock plate 70. And a shutter 80.

  In FIG. 4, the disc-shaped lock plate 70 is a state in which the disc-shaped lock plate 70 is rotated 90 ° clockwise in plan view from the mounted position on the cartridge holding container 40 in order to show the right side thereof. Shown on the outside. The disk-like lock plate 70 shown on the outside is mounted in the cartridge holding container 40 by turning it 90 ° counterclockwise in plan view as indicated by a white arrow.

  Such a disk-shaped lock plate 70 includes a circular plate main body 71, a central axis (support shaft) 72 projecting concentrically from the central position of the plate main body 71 toward the left, and a periphery of the plate main body 71. And an operation lever 73 projecting radially outward from the surface. The outer diameter of the center shaft 72 is fitted into the curvature center hole 411 of the cartridge holding container 40 in a sliding state, and the amount of protrusion from the plate body 71 is set slightly larger than the thickness of the left side plate 41a. ing.

  A screw hole 721 is screwed at the center position of the central shaft 72. Then, in a state where the center shaft 72 is inserted from the inside of the side plate 41 into the curvature center hole 411, a male screw 74 having a washer 741 having a diameter larger than the inner diameter dimension of the curvature center hole 411 is screwed into the screw hole 721. As a result, the disc-like lock plate 70 is attached to the left side plate 41a of the cartridge holding container 40 in a state of being prevented from coming off so as to be rotatable about the central axis 72.

  Further, the plate body 71 is recessed on the right surface side (the rear surface side in the case of 90 ° clockwise rotation from the normal mounting position in FIG. 4) so as to extend radially from the peripheral surface toward the center position. A mounting groove (first engagement portion) 75 orthogonal to the operation lever 73 is provided. The mounting groove 75 has a groove width dimension set to be slightly wider than a diameter dimension of a fitting protrusion (second engaging portion) 84 to be described later. A locking piece 751 is provided in a central position so as to project in the direction in which the mounting groove 75 extends.

  Further, the plate main body 71 is provided with a right-side circular arc ridge (first ridge 112) 76 concentrically bulging from the substantially central position in the longitudinal direction of the mounting groove 75 toward the operation lever 73. The right circular arc ridge 76 is provided at a position facing the interference protrusion 57 protruding from the left side plate 51 a of the toner cartridge 50. The right circular arc ridge 76 has an inclined surface 761 whose thickness dimension (bulge amount) gradually increases from the mounting groove 75 toward the operation lever 73.

  Further, the plate main body 71 is provided with a left-side circular arc ridge (fourth engaging portion 111) 77 having a center of curvature at the center of the central axis 72 on the left side. The left circular arc ridge 77 is a member in which the developing device 20 protrudes from a predetermined frame (first partition wall 102) 18 in the upper case 10a (FIG. 2) of the facsimile device 10 toward the developing device 20. A stop protrusion (apparatus body side protrusion) 181 is provided. The left circular arc ridge 77 has a radius of curvature (radius) dimension with the center of the plate body 71 as the center of curvature and is set slightly larger than the radius of curvature of the arc plate 412 of the left side plate 41a. The amount of protrusion from 71 is set to be slightly larger than the thickness dimension of the left side plate 41 a, so that the left circular arc ridge 77 protrudes to the left from the male screw 74 in a state where the center shaft 72 is fitted in the curvature center hole 411. It has become.

  Such a left circular arc ridge 77 is shown in FIG. 6 from a state in which the disc-shaped lock plate 70 is set to the developing device lock posture shown in FIG. 5 (in this posture, the operation lever 73 faces forward). The curvature circumference is set so as to be below the locking projection 181 and contact and interfere with the locking projection 181 until the toner cartridge lock position shown (the operation lever 73 faces upward in this position) is reached. ing.

  Therefore, as shown in FIG. 7, in the state in which the operation lever 73 is inclined obliquely backward and forward and the disc-like lock plate 70 is set to the developing device unlocking posture, the engagement of the left circular arc ridge 77 is increased. Interference with the stop protrusion 181 is eliminated (that is, the locked state is released), so that the developing device 20 can be detached from the frame 18.

  In the toner cartridge 50, the mounting groove 75 faces upward only when the disc-shaped lock plate 70 is set in the developing device lock position (FIG. 5), so that a later-described insertion protrusion 84 enters the mounting groove 75. It is guided and thereby becomes detachable with respect to the cartridge holding container 40. On the other hand, the toner cartridge 50 set to a posture other than the developing device lock posture is prevented from being detached from the cartridge holding container 40 when the mounting groove 75 is inclined.

  Such a disk-like lock plate 70 can be easily changed in posture by forward / reverse rotation operation around the central axis 72 of the operation lever 73 projecting radially outward from the circumferential surface. ing. The front plate 43 of the cartridge holding container 40 is provided with a relief groove 431 for releasing the operation lever 73 of the disc-like lock plate 70 set in the developing device lock posture.

  The shutter 80 includes a shutter body 81 that closes the toner discharge port 56 of the toner cartridge 50 so as to be openable and closable, and a pair of widthwise directions that extend from both widthwise ends of the shutter body 81 toward the center of curvature of the side plate 51. The support arm 82 is configured. The shutter main body 81 is dimensioned so as to cover the toner discharge port 56, and the cross-sectional shape viewed from the X direction has an arc shape so that the shutter main body 81 can be in sliding contact with the inner surface of the arc bottom plate 52 of the toner cartridge 50. The shape is set.

  In order to support the support arm 82 on the right side of the shutter 80, the arc bottom plate 52 is provided with a support plate 521 that protrudes upward slightly to the right from the right end of the toner discharge port 56. . The right support arm 82 is pivotally supported around a support shaft 83 concentric with the center of curvature of the side plate 51 provided on the support plate 521 and is supported on the left support arm 82 on the left side. An insertion protrusion 84 is provided that protrudes outward from a position corresponding to the curvature center hole 511 formed in the plate 51a. The fitting projection 84 is set to have a diameter dimension slightly smaller than the inner diameter dimension of the curvature center hole 511, and can be fitted into the curvature center hole 511 in a sliding state.

  The insertion protrusion 84 is inserted into the curvature center hole 511, and the right support arm 82 is pivotally supported by the support shaft 83, so that the shutter 80 rotates around the common axis of the support shaft 83 and the insertion protrusion 84. The shutter body 81 is rotatably mounted in the toner cartridge 50 so that the posture can be changed between a closed posture in which the shutter body 81 covers the toner discharge port 56 and an open posture in which the shutter body 81 opens the toner discharge port 56. It has become.

  Further, the insertion protrusion 84 is provided with a notch recess 841 formed by being cut from the lower position of the peripheral surface toward the axial center. The cut recess 841 is shaped so that it can be fitted over a locking piece 751 provided in the inner part of the mounting groove 75 of the plate body 71. Therefore, when the toner cartridge 50 is fitted into the cartridge holding container 40 in a state where the disc-like lock plate 70 is set to the developing device lock posture, as shown in FIG. , While being guided by the mounting groove 75, the cut recess 841 is fitted onto the locking piece 751 so that both can be rotated concentrically and integrally.

  Hereinafter, the operation of the present invention will be described in detail with reference to FIGS. 11 and 12. 11 and 12 are explanatory views for explaining the operation of the lock mechanism 60 according to the present invention. FIG. 11 (a) shows a state in which the disc-like lock plate 70 is set to the developing device lock posture. FIG. 11B shows a state immediately after the toner cartridge 50 is fitted in the cartridge holding container 40, and FIG. 12B shows a disk shape. In the state where the toner cartridge 50 fitted in the cartridge holding container 40 is locked (prevented from being detached) by changing the posture of the lock plate 70 to the toner cartridge lock posture, FIG. Each of the states is set to the developing device unlocking posture.

  In FIGS. 11 and 12, the subscript “a” attached to (a) and (b) indicates that the cross-sectional view is a front view, and the subscript “b” is a side view. It shows that it is a sectional view. Also, in FIG. 11, the opening / closing mechanism 45 is not shown because the drawing becomes complicated and difficult to see.

  First, as shown in FIG. 11A, when the toner cartridge 50 is attached to or detached from the cartridge holding container 40 attached to the frame 18 of the upper case 10a of the facsimile apparatus 10, the disk-shaped lock plate 70 is developed. The posture is set to the device lock posture. As a result, the mounting groove 75 of the disk-shaped lock plate 70 faces upward, and the toner cartridge 50 is attached to and detached from the cartridge holding container 40 by guiding the insertion protrusion 84 of the shutter 80 in the upward mounting groove 75. can do.

  In this case, the toner cartridge 50 is attached to and detached from the cartridge holding container 40 in a state where the columnar protrusion 512 provided on the right side plate 51 b of the toner cartridge 50 is in sliding contact with the right side plate 41 b of the cartridge holding container 40. .

  Next, immediately after the toner cartridge 50 is fitted into the cartridge holding container 40, the notch recess 841 of the fitting projection 84 is fitted into the locking piece 751 of the plate main body 71 as shown in FIG. Thus, the insertion protrusion 84 and the plate body 71 are relatively prevented from rotating, and the toner cartridge 50 is moved to the left in the cartridge holding container 40, so that the columnar protrusion 512 of the toner cartridge 50 is In this state, the cartridge holding container 40 is in the unlocked state where it is not yet fitted into the curvature center recess 413.

  In this state, the toner discharge port 56 of the toner cartridge 50 is closed by the shutter body 81 by setting the shutter 80 to the closed posture. Therefore, the toner filled in the toner cartridge 50 is not discharged through the toner discharge port 56.

  Next, when the operation lever 73 is grasped with a finger and the plate main body 71 is rotated 90 ° in the clockwise direction in FIG. 11B, it becomes possible to rotate together via the locking piece 751 and the notch recess 841. As shown in FIG. 12A, the disc-like lock plate 70 is set to the open posture.

  In this state, as shown in FIG. 12A, the interference protrusion 57 of the toner cartridge 50 relatively lifts the inclined surface 761 of the right circular arc ridge 76 of the disk-shaped lock plate 70. Since the toner cartridge 50 is pressed rightward, the columnar protrusion 512 is fitted into the curvature center concave portion 413 of the cartridge holding container 40 by the movement of the toner cartridge 50 rightward.

  In this case, the insertion protrusion 84 protruding from the left support arm 82 of the shutter 80 does not come off the mounting groove 75 even if the toner cartridge 50 moves rightward in the cartridge holding container 40. The amount of protrusion from the support arm 82 is set. Accordingly, the disk-shaped lock plate 70 shown in FIG. 11B is rotated clockwise from the developing device lock position by the operation of the operation lever 73, and the disk-like lock plate 70 shown in FIG. By changing the posture to the toner cartridge locking posture, the toner cartridge 50 is locked to the cartridge holding container 40.

  Then, when the disk-shaped lock plate 70 is changed from the developing device lock position to the toner cartridge lock position, the insertion protrusion 84 in which the notch recess 841 is fitted in the locking piece 751 is turned clockwise around the axis. As a result, the shutter main body 81 is also rotated integrally with the fitting protrusion 84 and is set to the open posture as shown in FIG. As a result, the toner in the toner cartridge 50 is discharged toward the developing device main body 30 through the toner discharge port 56.

  Next, when the developing device 20 having the toner cartridge 50 mounted on the cartridge holding container 40 is removed from the frame 18 of the facsimile apparatus 10, the disk-shaped lock plate 70 is unlocked as shown in FIG. Change posture to posture. By doing so, the left circular arc ridge 77 does not interfere with the locking projection 181 of the frame 18 of the facsimile machine 10, so that the developing device 20 can be removed from the frame 18. Even when the developing device 20 is mounted on the facsimile machine 10, the disc-like lock plate 70 is naturally set to the developing device unlocking posture.

  Further, when only the toner cartridge 50 attached to the cartridge holding container 40 is attached or detached while the developing device 20 is attached to the facsimile machine 10, the disk-shaped lock plate 70 is as shown in FIG. In addition, the posture is set to the developing device lock posture. As a result, the shutter body 81 rotates counterclockwise around the axis of the support shaft 83 and the fitting protrusion 84 so that the toner discharge port 56 is closed by the shutter body 81, and the plate body of the disk-shaped lock plate 70. 71 rotates to eliminate the interference of the right circular arc ridge 76 with respect to the interference projection 57.

  When the toner cartridge 50 is moved to the left in this state, the columnar protrusion 512 is detached from the curvature center concave portion 413 (state (A) in FIG. 11), so that the toner cartridge 50 is attached to and detached from the cartridge holding container 40. be able to.

  As described above in detail, the developing device 20 according to the present embodiment includes the developing device main body 30 that is detachably attached to the frame 18 that is a part of the device main body of the facsimile apparatus 10, and the developing device main body 30. And a toner cartridge 50 for toner replenishment that is detachably attached to the toner cartridge 50. The developing device main body 30 includes a cartridge holding container 40 having an upper surface opening for attaching and detaching the toner cartridge 50, while the toner cartridge 50 is shaped and set so as to be stably accommodated in the cartridge holding container 40.

  A disc-like lock plate 70 is provided on the left side plate 41a of the cartridge holding container 40 so as to be rotatable around the central axis 72. The developing device body 30 can be locked and unlocked with respect to the facsimile apparatus 10 and the toner cartridge 50 can be unlocked. Since the lock mechanism 60 that can selectively perform the locking and unlocking operation on the cartridge holding container 40 by the rotation operation around the central axis 72 by one touch of the disk-shaped lock plate 70 is provided, the center of the disk-shaped lock plate 70 is With the one-touch rotation operation around the shaft 72, the developing device 20 can be locked and unlocked with respect to the facsimile apparatus 10 and the toner cartridge 50 can be selectively locked and unlocked with respect to the developing apparatus 20.

  Therefore, the developing device 20 and the toner cartridge 50 are attached and detached as compared with the conventional locking mechanism in which the locking operation of the developing device 20 with respect to the facsimile device 10 and the locking operation of the toner cartridge 50 with respect to the developing device 20 had to be performed separately. The operability of the operation is remarkably improved, whereby the replacement operation of the toner cartridge 50 and the maintenance operation of the developing device 20 can be performed efficiently.

  In addition, the toner cartridge 50 is provided with a shutter 80 that is opened when the toner cartridge 50 is attached to the cartridge holding container 40, and the lock mechanism 60 locks and unlocks the toner cartridge 50 with respect to the cartridge holding container 40 and the toner cartridge 50. The shutter 80 can be opened and closed at the same time by a one-touch rotation of the disk-shaped lock plate 70 around the central axis 72. Therefore, when the toner cartridge 50 is mounted on the cartridge holding container 40, the disk-shaped lock plate 70 is opened. By rotating the lock plate 70 in a predetermined direction by a one-touch operation, the toner cartridge 50 is locked with respect to the cartridge holding container 40 and the shutter 80 is simultaneously opened. And unlocking the shutter 80 closed is performed at the same time by one-touch operation toward the same opposite direction upon removal from 0. Therefore, also in this respect, the workability of the replacement operation of the toner cartridge 50 can be greatly improved as compared with the conventional developing device in which the locking or unlocking operation and the opening / closing operation of the shutter 80 have to be performed separately. it can.

  Since the lock mechanism 60 has a locking protrusion 181 that protrudes from the frame 18 of the facsimile apparatus 10 to the upper side of the left circular arc ridge 77 of the lock plate 70, the rotation of the disk-shaped lock plate 70. By changing the posture of the disk-shaped lock plate 70 between the developing device locking posture and the unlocking posture by a moving operation, the locking protrusion 181 interferes with the left circular arc ridge 77 or interference is avoided. Therefore, the developing device 20 can be easily locked and unlocked with the one-touch operation of the disk-shaped lock plate 70.

  Moreover, in this embodiment, the lock mechanism 60 is mounted so as to extend from the peripheral surface recessed in the inner surface of the disk-shaped lock plate 70 to the position including the axis of the central shaft 72 in addition to the locking protrusion 181. A groove 75, a right-surface arc ridge 76 centering on the axis projecting from the inner surface of the groove 75, and a fitting protrusion 84 projecting from the left side plate 51 a of the toner cartridge 50 and fitting into the mounting groove 75. And an interference protrusion 57 that protrudes from the left side plate 51 a and interferes with the right-side arc ridge 76.

  The right circular arc ridge 76 is provided with an inclined surface 761 whose protrusion amount gradually increases as it is separated from the mounting groove 75 in the circumferential direction, and is interfered with the insertion protrusion 84 at the axial position of the mounting groove 75. A locking piece 751 for preventing the relative rotation of the projection is provided. The fitting projection 84 closes the shutter 80 when the disk-like lock plate 70 is unlocked, and the shutter 80 when the locking operation is performed. Since the toner cartridge 50 is linked to the shutter 80 so as to open the toner cartridge 50, when the toner cartridge 50 is attached to the cartridge holding container 40, the toner cartridge 50 is attached to the attachment groove 75 whose fitting protrusion 84 extends in the attachment direction of the plate body 71. The toner cartridge 50 is inserted into the cartridge holding container 40 in a state where the toner cartridge 50 is fitted in the cartridge. Go fitted in lifting container 40.

  Therefore, after the toner cartridge 50 is fitted in the cartridge holding container 40, the disk-shaped lock plate 70 is rotated around the central axis 72 in the direction in which the right circular arc ridge 76 interferes with the interference protrusion 57. The toner cartridge 50 has its interference projection 57 pressed against the inclined surface 761 of the right circular arc ridge 76, thereby moving in the cartridge holding container 40 toward the curvature center concave 413 and moving the cartridge holding container 40. The fitting protrusion 84 is inserted into the curvature center concave portion 413 and is prevented from coming off from the mounting groove 75 which is turned sideways, whereby the toner cartridge 50 is locked to the cartridge holding container 40 and the shutter 80 of the toner cartridge 50 is moved. The toner inside the toner cartridge 50 is opened. There is replenished to the developing device main body 30.

  Further, when removing the toner cartridge 50 from the cartridge holding container 40, the disk-shaped lock plate 70 may be rotated around the central axis 72 in the opposite direction to that when the toner cartridge 50 is mounted. As a result, the interference projection 57 is released from the inclined surface 761 of the right circular arc ridge 76, and the toner cartridge 50 is removed from the curvature center recess 413, and the mounting groove 75 faces in the direction of extracting the toner cartridge 50. Therefore, the shutter 80 is closed in conjunction with this, so that the toner cartridge 50 can be removed from the cartridge holding container 40 in a state where leakage of the toner is prevented.

  As described above, the locking protrusion 181 provided on the facsimile apparatus 10 side as the lock mechanism 60, the left circular arc protrusion 77, the mounting groove 75, the right circular arc protrusion 76, and the toner cartridge 50 provided on the disk-like lock plate 70 are provided. The projections 84 and the interference projections 57 that interfere with the right-side arc ridges 76 are provided, and the projection amount of the right-side arc ridges 76 gradually increases as they are separated from the mounting grooves 75 in the circumferential direction. By providing such an inclined surface 761, the lock mechanism 60 is simplified, and the developing device 20 is locked and unlocked with respect to the facsimile machine 10, and the toner cartridge 50 is locked and unlocked with respect to the cartridge holding container 40. In addition to performing one-touch operation, the shutter 80 can be opened and closed simultaneously. It becomes possible.

  Further, since the disk-shaped lock plate 70 is provided with an operation lever 73 for assisting the rotation operation of the disk-shaped lock plate 70, the disk-shaped lock plate 70 is moved to the central axis 72 by the operation of the operation lever 73. It becomes possible to rotate around, and good operability of the disk-shaped lock plate 70 can be ensured.

  The present invention is not limited to the above embodiment, and includes the following contents.

  (1) In the above embodiment, the lock mechanism 100 according to claim 1 of the present invention is applied to the developing device 20 of the facsimile apparatus 10. However, in the present invention, the lock mechanism 100 is applied to the developing device 20. It is not limited thereto, and may be interposed between a so-called drum unit in which the photosensitive drum 110 is unitized and a predetermined frame of the upper case 10a of the facsimile apparatus 10 that supports the drum unit. The unit may be interposed between the fixing and conveying device 14 in a unit and a predetermined frame of the upper case 10a of the facsimile apparatus 10 that supports the fixing and conveying device 14.

  (2) In the above embodiment, a coil spring may be housed in the curvature center recess 413 provided on the right side plate 41 b of the cartridge holding container 40. As a result, the columnar protrusion 512 of the toner cartridge 50 fitted in the curvature center recess 413 is pressed toward the disk-shaped lock plate 70 by the biasing force of the coil spring, so that the toner cartridge 50 can be operated manually. Thus, even if it is not moved to the disk-shaped lock plate 70 side, it is automatically moved by the urging force of the coil spring, and the operability of the removal operation of the toner cartridge 50 from the cartridge holding container 40 can be improved accordingly.

  (3) In the above-described embodiment, the curvature center recess 413 is formed in the right side plate 41 b of the cartridge holding container 40, while the columnar protrusion 512 facing the curvature center recess 413 is protruded from the side plate 51 of the toner cartridge 50. However, instead of this, a concave portion may be provided on the side plate 51 side of the toner cartridge 50 and a convex portion that fits into the concave portion may be provided on the side plate 41 side of the cartridge holding container 40.

  (4) In the embodiment described above, the right circular arc ridge 76 is provided on the disk-shaped lock plate 70 side, and the interference projection 57 facing the right circular arc ridge 76 is provided on the toner cartridge 50 side. However, instead of this, an interference protrusion may be provided on the disk-shaped lock plate 70 side, and an arc ridge may be provided on the toner cartridge 50 side.

  (5) In the above embodiment, the rotation range of the disk-shaped lock plate 70 is set to 90 °, but the present invention is limited to the rotation range of the disk-shaped lock plate 70 being 90 °. However, it may be 90 ° or less, or may exceed 90 °.

  (6) In the above embodiment, the facsimile apparatus 10 is employed as the image forming apparatus to which the developing device 20 according to the present invention is applied. However, in the present invention, the image forming apparatus to which the developing device 20 is applied is employed. The facsimile apparatus 10 is not limited to the facsimile machine 10 and may be a copying machine or various printers connected to a computer.

It is explanatory drawing which showed the invention of Claim 1 and 2 notionally, (a) has shown invention of Claim 1, (b) has shown invention of Claim 2, respectively. 1 is an external perspective view showing an embodiment of a facsimile machine to which a developing device according to the present invention is applied. It is explanatory drawing for demonstrating the outline | summary of the internal structure of the facsimile apparatus shown in FIG. FIG. 2 is a partially cutaway exploded perspective view showing an embodiment of a developing device according to the present invention. FIG. 5 is a partially cut-out assembly perspective view of the developing device shown in FIG. 4, showing a state in which the disk-shaped lock plate is set to the developing device locking posture. FIG. 5 is a partially cut-out assembly perspective view of the developing device shown in FIG. 4, showing a state in which the disc-like lock plate is set in a toner cartridge lock posture. FIG. 5 is a partially cut-out assembly perspective view of the developing device shown in FIG. 4, showing a state in which the disc-shaped lock plate is set in a developing device unlocking posture. It is the sectional view on the AA line of FIG. FIG. 6 is a sectional view taken along line B-B in FIG. 5. It is sectional drawing which shows one Embodiment of an opening-closing mechanism, (a) shows the state in which the gate member was set to the closed position, (b) shows the state in which the gate member was set to the open position, respectively. Yes. FIG. 6B is an explanatory diagram for explaining the operation of the lock mechanism according to the present invention, in which (A) shows that the toner cartridge is being attached to the cartridge holding container in a state where the disk-like lock plate is set to the developing device lock posture. The state (b) shows the state immediately after the toner cartridge is fitted into the cartridge holding container. FIG. 6 is an explanatory diagram for explaining the operation of the lock mechanism 60 according to the present invention, in which (a) shows a toner cartridge fitted into a cartridge holding container by changing the posture of a disk-like lock plate to a toner cartridge lock posture; The locked state (retained) and (b) indicate the state where the disc-like lock plate is set to the developing device unlocking posture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100,100 'Lock mechanism 101 1st apparatus main body 102 1st division wall 103 1st attachment part 104 2nd division wall 105 2nd apparatus main body 106 2nd attachment part 107 Attachment 108 One side wall 109 Lock plate 109a Support shaft 110 1st 3 Engagement part (apparatus body side protrusion)
111 4th engaging part 112 1st protruding item | line 113 2nd protruding item | line 114 Mounting groove | channel (1st engaging part)
115 Insertion protrusion (second engagement part)
10 Facsimile device (image forming device)
10a Upper case 10b Lower case 10c Hinge part 1 Reading part 2 Transfer part 11 Imaging unit 11a Photosensitive drum 12 Transfer roller 13 Laser device 14 Fixing and conveying apparatus 3 Paper feed part 15 Paper discharge tray 16 Paper feed cassette 17 Paper feed apparatus 18 Frame (First partition wall) 181 Locking projection (third engaging portion)
20 Developing Device 30 Developing Device Main Body 31 Housing 311 Side Wall 312 Front Top Plate 32 Developing Roller 321 Roller Shaft 322 Roller Main Body 33 Spiral Feeder 331 Feeder Shaft 332 Spiral Fin 40 Cartridge Holding Container 41 Side Plate 41a Left Side Plate (Second Partition Wall) 41b Right side plate 411 Curvature center hole 412 Bush 413 Curvature center concave part (shaft support part) 414 Arc plate 42 Arc bottom plate 421 Insertion window 43 Front plate 431 Escape concave groove 431 Escape concave groove 44 Rear plate 45 Opening mechanism 46 Gate member 461 Slide plate 462 Rib 47 Coil spring 48 Toner supply port 50 Toner cartridge 51 Side plate 51a Left side plate (one side wall)
51b Right side plate 511 Curvature center hole 512 Columnar projection 52 Arc bottom plate 521 Support plate 53 Front plate 54 Rear plate 55 Cover 56 Toner discharge port 57 Interference projection (second protrusion)
60 Locking mechanism 70 Disc-shaped lock plate (lock plate)
71 Plate body 72 Central axis (support axis)
721 Screw hole 73 Operation lever 74 Male screw 75 Mounting groove (first engaging portion)
751 Locking piece 76 Right arc ridge (first ridge)
761 Inclined surface 77 Left circular arc ridge (4th engaging part)
80 Shutter 81 Shutter body 82 Support arm 83 Support shaft 84 Insertion protrusion (second engagement portion) 841 Cut recess

Claims (9)

A locking mechanism for mounting and locking a second device main body in which an attachment is mounted on a second mounting portion having a second partition wall on a first mounting portion of a first device main body having a first partition wall;
The second partition wall is provided with a rotary lock plate facing one side wall of the attachment,
The lock plate is provided with a first engagement portion, while one side surface of the attachment is provided with a second engagement portion that engages with the first engagement portion,
When the second engagement portion engages with the first engagement portion, the attachment is attached to the second attachment portion of the second device main body,
The first partition wall is provided with a third engagement portion, while the lock plate is provided with a fourth engagement portion corresponding to the third engagement portion,
The fourth engagement portion is configured to prevent the second device main body from being detached from the first attachment portion of the first device main body due to interference with the third engagement portion by a rotation operation of the lock plate, A lock mechanism characterized in that the shape is set so that the retaining is released by avoiding interference with the third engagement portion by a rotation operation of a lock plate. The surface of the lock plate opposite to the surface on which the fourth engaging portion is provided is provided with a first ridge, while the attachment is provided with a second ridge facing the first ridge. Is provided,
2. The shape of each of the first and second ridges is set such that the attachment is locked to the second mounting portion by mutual interference caused by the rotation of the lock plate. The locking mechanism described.   3. The developing device to which the lock mechanism according to claim 1 is applied, wherein the first device main body is a device main body of the image forming apparatus, and the second device main body is connected to the device main body of the image forming apparatus. A developing device main body which is detachably attached and supplies toner to a photosensitive drum, and the attachment is a toner cartridge which is detachably attached to the developing device main body. The developing device main body includes a cartridge holding container having an upper surface opening for attaching and detaching the toner cartridge,
The lock plate is pivotally supported on one side of the opposing wall surface in the longitudinal direction of the cartridge holding container so as to be rotatable around a support shaft,
The developing device main body is selectively locked and unlocked with respect to the first apparatus main body, and the toner cartridge is locked and unlocked with respect to the cartridge holding container by a rotation operation around the support shaft by one touch of the lock plate. The developing device according to claim 3, further comprising a locking mechanism that obtains the locking mechanism. The locking mechanism is recessed on a surface of the lock plate facing the other side of the opposing wall surface, and has a mounting groove extending from a peripheral surface to a position including the axis of the support shaft;
A front arcuate ridge having a center of curvature at the center of rotation of the lock plate protruding from the surface opposite to one side of the opposite wall surface;
An insertion protrusion that protrudes from the toner cartridge and fits into the attachment groove;
A device body-side protrusion that protrudes from the first device body toward the upper position of the lock plate,
The developing device according to claim 4, wherein the front-side arc ridge is positioned at a position where one end thereof overlaps the mounting groove. On the other side of the opposing wall surface of the cartridge holding container, a shaft support portion that is opposed to the support shaft is provided, while the toner cartridge is configured to be supported by the shaft support portion,
While the surface on the opposite side to the surface on which the front-side arc ridges of the lock plate are provided corresponds to the front-side arc ridges, and the back-side arc ridges having the same center of curvature are provided, An interference protrusion that interferes with the back-side arc ridge is provided above the insertion protrusion in the toner cartridge,
The back-side arc ridge has an inclined surface in which the amount of protrusion gradually increases with distance from the mounting groove in the circumferential direction,
The developing device according to claim 5, wherein the mounting groove is provided with a locking piece that prevents relative rotation of the insertion protrusion by interference with the insertion protrusion. The toner cartridge is provided with a shutter that is opened in a state of being mounted on the developing device main body,
The developing device according to claim 6, wherein the shutter is linked to the lock mechanism so as to be opened by a lock operation of the toner cartridge with respect to a cartridge holding container and to be closed by a lock release operation.   The developing device according to claim 4, wherein the lock plate is provided with an operation lever for assisting a rotation operation of the lock plate.   9. The toner cartridge is provided with a corresponding protrusion corresponding to the shaft support portion, and the shaft support portion is a recess or a hole into which the corresponding protrusion can be fitted. The developing device described.

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