JP5775852B2 - Open / close cover lock mechanism and image forming apparatus - Google Patents

Description

  The present invention relates to an open / close cover lock mechanism and an image forming apparatus.

  In an image forming apparatus such as a copying machine, a facsimile, or a printer, an opening / closing cover is generally provided for maintenance of components in the apparatus main body. For example, an open / close cover that opens and closes the opening on the side of the apparatus main body is normally supported so that both ends in the horizontal direction of the open / close cover can be opened and closed with the support shaft as a fulcrum through the cover support shaft. When the opening / closing cover is closed, the opening / closing cover is locked by the opening / closing cover locking mechanism, so that the opening of the apparatus body is reliably closed without opening the opening / closing cover.

As described above, the open / close mechanism disclosed in Patent Document 1 is known as an open / close cover lock mechanism that locks the open / close cover to the apparatus main body.
In Patent Document 1, an open / close cover of an image forming apparatus is supported on an apparatus main body through both horizontal ends of the open / close cover via a horizontal open / close cover support shaft so that the open / close cover can be opened and closed with the support shaft as a fulcrum. A lock mechanism for locking the opening / closing cover to the apparatus body is provided between the upper part of the apparatus body and the lower part of the opening / closing cover, and a hook supported rotatably on a hook shaft extending in a horizontal direction in parallel with the opening / closing cover support shaft. The opening / closing cover is locked to the apparatus main body by engaging with the hook receiving portion.

Japanese Patent Laid-Open No. 7-219411

Incidentally, in an electrophotographic image forming apparatus, a transfer roller is pressed against the surface of an image carrier such as a photosensitive drum or an intermediate transfer belt, and an open / close cover serves as an image carrier. May have a function to pressurize. In such a case, a high load that opens to the outside acts on the opening / closing cover in a reactive manner.
In the above prior art, when such a high load is applied to the opening / closing cover, the hook shaft may rotate unexpectedly without operating the lever, the lock may be released, and the opening / closing cover may be opened. There is a problem that there is.

  SUMMARY An advantage of some aspects of the invention is that it provides an open / close cover lock mechanism and an image forming apparatus that can prevent unlocking due to a load applied to the open / close cover.

In order to solve the above-described problems, the present invention provides an opening / closing cover locking mechanism that releases a lock by rotating a lever portion having a rotation shaft around the rotation shaft, and allows the opening / closing cover to be opened and closed with respect to the apparatus main body. A locking portion provided on the apparatus main body, a claw portion provided on the rotating shaft in an axial direction in which the rotating shaft extends, a lock position lockable on the locking portion, and A configuration is adopted in which slide means for sliding the claw portion with respect to the rotating shaft in the axial direction is provided between the retracted position retracted from the lock position.
By adopting this configuration, in the present invention, the claw portion can be locked by sliding in the axial direction instead of rotating the claw portion, and the claw portion is directed in the axial direction other than the rotation direction. The load direction can be made perpendicular to the rotation axis. For this reason, the torque at the center of the rotating shaft is reduced, and rotation of the rotating shaft is prevented even when a load is applied.

Further, in the present invention, a configuration is adopted in which the slide means has an urging means for urging the claw portion from the retracted position toward the lock position.
By adopting this configuration, in the present invention, the claw portion is slid to the lock position and locked by the urging force of the urging means. Further, since the claw portion slides to the retracted position by resisting the urging force of the urging means, it is difficult to release the lock.

In the present invention, the biasing unit further biases the rotating shaft in a rotation direction opposite to the rotation direction for releasing the lock.
By adopting this configuration, in the present invention, the number of parts can be reduced by achieving the urging of the claw portion and the urging of the rotating shaft by one urging means.

In the present invention, the sliding means is provided on the rotating shaft and extends in the axial direction, and the sliding means is slidable in the axial direction with respect to the engaging convex portion. The structure of having an engaging recess to be engaged is adopted.
By adopting this configuration, in the present invention, the engagement of the engaging convex portion and the engaging concave portion enables the claw portion to slide in the axial direction and restricts the relative rotation of the claw portion around the rotation axis. Can do.

Moreover, in this invention, the said latching | locking part employ | adopts the structure of having a groove | channel for canceling | releasing latching with the said nail | claw part, when the said rotating shaft rotates in the rotation direction which cancels | releases the said lock | rock. .
By adopting this configuration, in the present invention, the locking can be released by rotating the rotating shaft by operating the lever portion and dropping the claw portion into the groove.

In the present invention, an image forming apparatus having an apparatus main body, an open / close cover that can be opened / closed with respect to the apparatus main body, the open / close cover locking mechanism described above, and an image forming unit is employed.
By adopting this configuration, in the present invention, an image forming apparatus capable of preventing unlocking of the opening / closing cover is obtained.

In the present invention, the image forming unit includes an image carrier and a transfer roller, and the open / close cover presses the transfer roller against the image carrier when the cover is in a closed state. The configuration is adopted.
By adopting this configuration, in the present invention, an image forming apparatus that can prevent the unlocking of the opening / closing cover that is subjected to a high load from the transfer roller can be obtained.

  According to the present invention, it is possible to obtain an open / close cover lock mechanism and an image forming apparatus that can prevent unlocking due to a load applied to the open / close cover.

1 is a schematic configuration diagram of a printer according to a first embodiment of the present invention. 1 is a perspective view illustrating an appearance of a printer according to a first embodiment of the present invention. It is a perspective view which shows the whole structure of the opening-and-closing cover lock mechanism in 1st Embodiment of this invention. It is a disassembled perspective view of the lever part in 1st Embodiment of this invention. It is a perspective view of the nail | claw part provided in the rotating shaft of the lever part in 1st Embodiment of this invention. It is a side view which shows the engagement state of the rotating shaft and claw part in 1st Embodiment of this invention. It is a top view for demonstrating the locking operation | movement of the opening / closing cover lock mechanism in 1st Embodiment of this invention. It is a side view for demonstrating the lock release operation | movement of the opening-and-closing cover lock mechanism in 1st Embodiment of this invention. It is a perspective view which shows the whole structure of the opening-and-closing cover lock mechanism in 2nd Embodiment of this invention. It is a disassembled perspective view of the lever part in 2nd Embodiment of this invention. It is a top view for demonstrating the locking operation of the opening-and-closing cover lock mechanism in 2nd Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, a case where the opening / closing cover lock mechanism of the present invention is applied to an image forming apparatus will be exemplified.

(First embodiment)
FIG. 1 is a schematic configuration diagram of a printer P according to the first embodiment of the present invention.
The printer (image forming apparatus) P includes a discharge portion a, a toner storage portion b, an image forming portion c, and a paper portion d. Further, the printer P is provided with a transport unit e from a paper part d located at the lower part to a discharge part a located at the upper part.

The discharge unit a is configured such that a sheet (sheet material) on which a predetermined image is formed is discharged through the transport unit e. The bottom surface of the discharge part a is inclined so that when a plurality of sheets are discharged, one end side is aligned and stacked.
The toner storage unit b is made of, for example, a black toner (BK) toner container, and is configured to supply toner to the developing unit c2 of the image forming unit c.

The image forming unit c includes a laser scanning unit c1, a developing unit c2, a drum unit c3, a transfer unit c4, and a fixing unit c5.
Similarly to the known laser scanning unit, the laser scanning unit c1 includes a light beam generator that generates laser light, a polygon mirror that scans a light beam emitted from the light beam generator, and the polygon mirror. And an fθ lens (both not shown) that forms an image on a photosensitive drum (image carrier) 1 described later.

The developing unit c <b> 2 develops an electrostatic latent image formed on the peripheral surface of the photosensitive drum 1 by supplying toner to the photosensitive drum 1. The developing roller 2 is disposed so as to face each other in the radial direction.
The drum unit c3 is a photosensitive drum on which an electrostatic latent image is generated on the peripheral surface of the drum by using the laser scanning unit c1 and a toner image is formed by toner supplied from the toner storage unit b to the developing unit c2. 1

Around the photosensitive drum 1, a charger 3 for charging the peripheral surface thereof and a cleaner 4 for removing toner remaining on the peripheral surface after the transfer are opposed to each other. The charger 3 and the cleaner 4 of the present embodiment are detachably united together with the photosensitive drum 1 as a drum unit c3.
The transfer unit c4 includes a transfer roller 5 that is disposed to face the circumferential surface of the photosensitive drum 1 in the radial direction. The transfer roller 5 is provided so as to press the photosensitive drum 1.

  Accordingly, when the photosensitive drum 1 is driven to rotate, the transfer roller 5 can rotate along with the rotation. In addition, when a predetermined sheet material, for example, a sheet has been conveyed through the conveying unit e, the transfer roller 5 can be rotated while the sheet is interposed between the photosensitive drum 1 and the sheet. The sheet can be conveyed to the fixing unit c5 side.

  The fixing unit c5 is provided in a part of the transport unit e on the downstream side of the transfer unit c4, and is a pair of rollers arranged so as to sandwich the paper transported through the transport unit e. It is configured. The fixing unit c5 is configured so that the toner image on the paper transferred by the transfer unit c4 by being pressed and heated by the pair of rollers can be fixed on the paper.

  The paper portion d is a paper feed cassette that is provided so as to be drawable with respect to the apparatus main body 10, and a part of the paper cassette extends from the apparatus main body 10. The paper part d is configured to be able to supply paper one by one from the paper feed cassette to the transport part e.

  The conveyance part e is provided from the paper part d located in the lower part to the discharge part a located in the upper part, and includes a plurality of conveyance rollers and a guide plate. The transport unit e is configured to transport the sheets supplied from the sheet unit d one by one toward the discharge unit a.

  In the printer P configured as described above, an electrostatic latent image is formed by irradiating the photosensitive drum 1 with laser light corresponding to the image data from the laser scanning unit c1, and the toner image is developed with the supplied toner. The toner image carried on the photosensitive drum 1 is transferred to a sheet by the transfer unit c4, and then subjected to a fixing process by being pressurized and heated by the fixing unit c5. Finally, the sheet on which the image is printed is discharged to the discharge unit a.

FIG. 2 is a perspective view illustrating an appearance of the printer P according to the first embodiment of the present invention.
As shown in FIG. 2, an opening / closing cover 11 is provided on the side surface of the apparatus main body 10 of the printer P. The opening / closing cover 11 of this embodiment is provided on the side surface on the side where the transfer roller 5 (see FIG. 1) is provided. The opening / closing cover 11 includes cover support shafts 12 (see FIG. 1) at both ends in the width direction below. For this reason, the open / close cover 11 is supported by the apparatus main body 10 so that it can be opened and closed with the cover support shaft 12 as a fulcrum.

  The open / close cover 11 presses the transfer roller 5 against the photosensitive drum 1 when it is in a closed state. For this reason, a load that causes the opening / closing cover 11 to open outwardly acts in a reactive manner. This load may be a high load depending on the device configuration. As shown in FIG. 2, the opening / closing cover 11 is provided with a lever portion 21. The opening / closing cover 11 is unlocked by pulling up the lever portion 21 and can be opened and closed with respect to the apparatus main body 10. The lever portion 21 constitutes an opening / closing cover lock mechanism 20 described below.

  FIG. 3 is a perspective view showing the overall configuration of the open / close cover lock mechanism 20 in the first embodiment of the present invention. FIG. 4 is an exploded perspective view of the lever portion 21 in the first embodiment of the present invention. FIG. 5 is a perspective view of the claw portion 40 provided on the rotating shaft 30 of the lever portion 21 in the first embodiment of the present invention. FIG. 6 is a side view showing an engaged state of the rotating shaft 30 and the claw portion 40 in the first embodiment of the present invention. FIG. 7 is a plan view for explaining the locking operation of the opening / closing cover locking mechanism 20 in the first embodiment of the present invention. FIG. 8 is a side view for explaining the unlocking operation of the opening / closing cover locking mechanism 20 in the first embodiment of the present invention.

  As shown in FIG. 3, the open / close cover lock mechanism 20 includes a lever portion 21 and a frame portion 22. The lever portion 21 is provided on the opening / closing cover 11. For this reason, the lever portion 21 is configured to be rotatable integrally with the opening / closing cover 11 with the cover support shaft 12 as a fulcrum. The frame portion 22 is provided in the apparatus main body 10. For this reason, the frame portion 22 is fixed at a fixed position. The positional relationship between the lever portion 21 and the frame portion 22 shown in FIG. 3 is that when the open / close cover 11 is in a closed state.

  The frame portion 22 is provided with a locking portion 23. The locking portion 23 is disposed on both sides of the lever portion 21. The locking portion 23 is formed in a plate shape having a predetermined thickness, and has a groove 24 cut out inward from the end surface facing the opening / closing cover 11. The groove 24 includes a first groove 24a and a second groove 24b. The first groove 24 a is a groove extending in the horizontal direction from the end surface of the locking portion 23. The second groove 24b is a groove extending vertically upward from the end of the first groove 24a. Therefore, the groove 24 is formed in an L shape as a whole.

The lever portion 21 includes a rotating shaft 30, a claw portion 40, and a sliding means 50.
The rotating shaft 30 extends in the horizontal direction, and both ends thereof are rotatably supported by the opening / closing cover 11. The lever portion 21 rotates with the rotary shaft 30 as a fulcrum. As shown in FIG. 4, the rotary shaft 30 is formed in a round bar shape having a predetermined diameter, and steps are provided at both ends thereof. The rotating shaft 30 includes a reduced diameter portion 31 having a reduced diameter at both ends thereof. The rotary shaft 30 of the present embodiment is formed of a resin material such as ABS resin (acrylonitrile, butadiene (Butadiene), styrene (Styrene) copolymer synthetic resin), for example.

  The claw portion 40 is provided on the rotary shaft 30 in the axial direction in which the rotary shaft 30 extends. The nail | claw part 40 is made into outward convex shape in the axial direction. As shown in FIG. 7, the claw portion 40 has a hook shape and includes a sliding portion 41 a and a contact portion 41 b. The sliding portion 41 a is a portion that slides with respect to the locking portion 23 when the opening / closing cover 11 is closed. The sliding portion 41 a is formed obliquely with respect to the direction orthogonal to the rotation shaft 30. That is, the sliding portion 41a is inclined so as to approach the rotating shaft 30 as it goes outward in the axial direction.

The contact portion 41 b is a portion that contacts the side surface of the second groove 24 b when the claw portion 40 is locked to the locking portion 23. The contact portion 41b is formed obliquely at a shallower angle than the sliding portion 41a. The angle of the contact portion 41b with respect to the direction orthogonal to the rotation axis 30 may be 90 or less, and is preferably formed in the range of 50 ° to 90 °, for example.
The nail | claw part 40 is provided with the hole 42 penetrated to an axial direction as shown in FIG. One end of a torsion coil spring 32 (see FIG. 4) is caught in the hole 42. The torsion coil spring 32 applies an urging force in a rotation direction opposite to the rotation direction for releasing the lock (see FIG. 8A).

  As shown in FIG. 4, the claw portion 40 is provided separately from the rotating shaft 30. The claw portion 40 is formed of a material that has good slidability with respect to the rotary shaft 30. For example, when the claw portion 40 is formed of the same ABS resin as that of the rotary shaft 30, the compatibility of the material is good and the sliding property is deteriorated. For this reason, the claw portion 40 is preferably formed of a resin material different from that of the rotating shaft 30. The nail | claw part 40 of this embodiment is formed from resin materials, such as POM (polyacetal) resin, for example.

  As shown in FIG. 7, the slide means 50 has a lock position (see FIG. 7B) that can be locked to the locking portion 23, and a retreat position that retracts from the lock position (FIG. 7A). The claw part 40 is slid with respect to the rotating shaft 30 in the axial direction. That is, the slide means 50 enables the claw portion 40 separate from the rotation shaft 30 to be slidable in an axial direction other than the rotation direction. It is intended to lock by sliding it.

As shown in FIG. 6, the slide means 50 has an engagement convex portion 51 provided on the rotating shaft 30 and an engagement concave portion 52 provided on the claw portion.
As shown in FIG. 4, the engaging convex portion 51 is provided in the reduced diameter portion 31 at both ends of the rotating shaft 30. The engaging convex part 51 is provided extending linearly in the axial direction. Further, as shown in FIG. 6, the engaging convex portion 51 is provided so as to protrude in the radial direction of the rotating shaft 30 (the reduced diameter portion 31). A plurality (three in this embodiment) of the engaging convex portions 51 are provided at equal intervals in the circumferential direction of the rotating shaft 30.

The engagement recess 52 engages with the engagement protrusion 51 so as to be slidable in the axial direction. The engagement recess 52 is provided in the engagement hole 43 provided in the claw portion 40. The engagement recess 52 is provided so as to be recessed in the radial direction from the inner peripheral surface of the engagement hole 43. A plurality (three in this embodiment) of the engagement recesses 52 are provided at equal intervals in the circumferential direction of the engagement hole 43.
As shown in FIG. 5, the claw portion 40 is attached to the reduced diameter portion 31 from the shaft end of the rotating shaft 30. The engagement of the engagement convex portion 51 and the engagement concave portion 52 enables the claw portion 40 to slide in the axial direction and restricts the relative rotation of the claw portion 40 around the rotation axis 30.

  The slide means 50 has a compression spring (biasing means) 53. The compression spring 53 is provided in the reduced diameter portion 31 and is disposed between the step of the rotating shaft 30 and the claw portion 40. As shown in FIG. 7, the compression spring 53 biases the claw portion 40 outward in the axial direction from the retracted position toward the lock position. Therefore, when moving to the lock position, the claw portion 40 slides outward in the axial direction by the bias of the compression spring 53, and when moving to the retracted position, the claw portion 40 resists the bias of the compression spring 53. Will slide inward in the axial direction.

  Next, the lock operation and the lock release operation by the open / close cover lock mechanism 20 having the above-described configuration will be described.

  In the printer P having the opening / closing cover locking mechanism 20, when the opening / closing cover 11 is closed to the apparatus main body 10, the lever portion 21 rotates together with the opening / closing cover 11 with the cover support shaft 12 as a fulcrum. When closing the opening / closing cover 11, the claw portion 40 provided in the lever portion 21 first comes into contact with the end surface of the locking portion 23 provided in the apparatus main body 10. Since the sliding portion 41 a of the claw portion 40 is inclined as shown in FIG. 7A, the claw portion 40 is retracted inside the locking portion 23 against the bias of the compression spring 53. Can slide into position.

  When the lever portion 21 is further pushed forward, the claw portion 40 moves to a position corresponding to the groove 24 of the locking portion 23 as shown in FIG. When it moves to the said position, the nail | claw part 40 provided facing in the axial direction will slide to an axial direction outer side by the urging | biasing of the compression spring 53, and will be located in a locked position. When positioned at the lock position, the contact portion 41b of the claw portion 40 is locked in the second groove 24b formed in the vertical direction, and the opening / closing cover 11 is locked to the apparatus main body 10. Become.

  Thus, in this embodiment, the slide means 50 is provided so that it can be locked not by the rotation of the claw portion 40 but by the sliding of the claw portion 40 in the axial direction, and the claw portion 40 is directed in the axial direction other than the rotation direction. Therefore, the load direction applied to the claw portion 40 can be made to act perpendicularly to the rotation shaft 30. For this reason, even when a high load is applied to the opening / closing cover 11 from the transfer roller 5, the torque generated around the rotating shaft 30 is reduced, and the unlocking due to the rotating shaft 30 rotating is prevented. be able to. For this reason, even when a high load is applied from the transfer roller 5, the printer P that can reliably prevent the unlocking of the open / close cover 11 is obtained.

  The slide means 50 has a compression spring 53 that biases the claw portion 40 from the retracted position toward the lock position. For this reason, after the claw portion 40 is slid to the locked position by the bias of the compression spring 53 and locked, the claw portion 40 slides to the retracted position by resisting the bias of the compression spring 53. Even when a high load is applied to the opening / closing cover 11, it is possible to make it difficult to release the lock. Moreover, since the contact part 41b of the nail | claw part 40 becomes a shape where the component force which goes to a retracted position does not act even if it receives a load, it can make it harder to remove | release a lock | rock.

  On the other hand, when the opening / closing cover 11 is opened, the lock is released by rotating the lever portion 21 around the rotation shaft 30 as shown in FIG. Since the rotating shaft 30 is biased by the torsion coil spring 32 in the rotational direction opposite to the rotational direction for releasing the lock, the lever portion 21 is rotated against the biasing. Specifically, as shown in FIG. 2, the lever portion 21 provided on the opening / closing cover 11 is operated to be lifted upward.

  The locking portion 23 has a groove 24 for releasing the locking with the claw portion 40 when the rotary shaft 30 rotates in the rotation direction for releasing the lock. In the present embodiment, when the rotary shaft 30 is rotated by operating the lever portion 21, the tip of the claw portion 40 moves below the second groove 24b as shown in FIG. The lock is released by being dropped into the first groove 24a communicating with the lower end of 24b. And as shown in FIG.8 (b), the nail | claw part 40 can be extracted from the 1st groove | channel 24a, and the opening-and-closing cover 11 can be opened.

  As described above, according to the above-described embodiment, the lever 21 having the rotation shaft 30 is rotated around the rotation shaft 30 to release the lock, and the opening / closing cover 11 can be opened / closed with respect to the apparatus main body 10. The opening / closing cover lock mechanism 20 is configured such that a locking portion 23 provided in the apparatus main body 10, a claw portion 40 provided on the rotating shaft 30 in the axial direction in which the rotating shaft 30 extends, and a locking portion 23 are provided. By adopting a configuration in which there is a slide means 50 that slides the claw portion 40 with respect to the rotary shaft 30 in the axial direction between a lock position where locking is possible and a retreat position where the lock position is retracted. The unlocking due to the load applied to the opening / closing cover 11 can be reliably prevented.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

FIG. 9 is a perspective view showing the overall configuration of the open / close cover lock mechanism 20 according to the second embodiment of the present invention. FIG. 10 is an exploded perspective view of the lever portion 21 in the second embodiment of the present invention. FIG. 11 is a plan view for explaining the locking operation of the opening / closing cover locking mechanism 20 in the second embodiment of the present invention.
As shown in FIGS. 9 and 10, in the second embodiment, the compression spring 53B has the function of the torsion coil spring 32 in addition to the function of the compression spring 53 of the first embodiment. Different from form.

  The compression spring 53B is a combination of the compression spring 53 and the torsion coil spring 32 of the first embodiment. The compression spring 53 </ b> B is provided in the reduced diameter portion 31 and is disposed between the step of the rotating shaft 30 and the claw portion 40. One end 53 </ b> B <b> 1 of the compression spring 53 </ b> B is disposed outward in the axial direction and is hooked into the hole 42 of the claw portion 40. The other end 53B2 of the compression spring 53B is arranged inward in the axial direction and presses against the opening / closing cover 11.

According to the compression spring 53B having the above-described configuration, not only can the claw portion 40 be urged outward in the axial direction, but also the rotary shaft 30 can be urged in a rotational direction opposite to the rotational direction for releasing the lock. Therefore, according to the second embodiment, the number of parts can be reduced by achieving the urging of the claw portion 40 and the urging of the rotating shaft 30 with one urging means.
Further, according to the compression spring 53B having the above-described configuration, as shown in FIG. 11, both when in the retracted position (see FIG. 11 (a)) and when in the locked position (see FIG. 11 (b)). The position of the other end 53B2 arranged inward in the axial direction does not change. For this reason, it is possible to smoothly slide the claw portion 40 without the other end 53B2 scratching the opening / closing cover 11 without taking any measures.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above embodiment, a printer is exemplified as the image forming apparatus. However, the present invention is applicable to an image forming apparatus such as a copying machine and a facsimile machine, and other apparatuses as well as the image forming apparatus. Is possible.

  P ... printer (image forming apparatus), c ... image forming unit, 1 ... photosensitive drum (image carrier), 5 ... transfer roller, 10 ... main body, 11 ... open / close cover, 20 ... open / close cover lock mechanism, 21 ... Lever part, 23 ... locking part, 24 ... groove, 30 ... rotating shaft, 40 ... claw part, 50 ... sliding means, 51 ... engaging convex part, 52 ... engaging concave part, 53 ... compression spring (biasing means) , 53B ... Compression spring (biasing means)

Claims (6)

An opening / closing cover locking mechanism that releases a lock by rotating a lever portion having a rotating shaft around the rotating shaft, and allows the opening / closing cover to be opened and closed with respect to the apparatus body,
A locking portion provided in the apparatus body;
Claw portions provided on the rotary shaft in the axial direction in which the rotary shaft extends;
Between a retracted position retracted from the lockable locking position and the locking position with the locking part, have a, a sliding means for sliding relative to said rotation axis the pawl portion in the axial direction,
The opening / closing cover locking mechanism , wherein the locking portion has a groove for releasing the locking with the claw portion when the rotating shaft rotates in a rotation direction for releasing the lock.   The opening / closing cover lock mechanism according to claim 1, wherein the slide unit includes a biasing unit that biases the claw portion from the retracted position toward the lock position. Said slide means is adapted to urge said retracted position said locking said claw portion toward the position from having biasing means for urging said rotary shaft in a rotational direction opposite to the rotation direction to release the lock, The opening / closing cover lock mechanism according to claim 1 . The sliding means is
An engaging projection provided on the rotating shaft and extending in the axial direction;
It has an engagement recessed part provided in the said nail | claw part, and engaging with the said engagement convex part so that it can slide to the said axial direction, The opening and closing as described in any one of Claims 1-3 characterized by the above-mentioned. Cover lock mechanism. The device body;
An opening and closing cover that can be opened and closed with respect to the apparatus body;
The open / close cover lock mechanism according to any one of claims 1 to 4 ,
And an image forming unit. The image forming unit includes an image carrier and a transfer roller,
The image forming apparatus according to claim 5 , wherein the open / close cover presses the transfer roller against the image carrier when the open / close cover is in a closed state.