JPH11196233A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device with the lock performance more excellent than that of a conventional image forming device. SOLUTION: A stationary member 13 that moves an image read means 12 reading an image of a sheet at a fixed position is provided to a main body movably in the case of moving the main body, and an energizing means 15 energizes the stationary member 13 to be moved to the fixed position. Then usually, while the stationary member 13 is locked by a lock means 17 against the energizing force of the energizing means 15, the lock means 17 is moved in a direction of relieving the lock of the stationary member 13 to move the stationary member 13 to a position at which the image read means 12 is fixed. Furthermore, after the movement of the main body, the lock means 17 is returned to the position at which the stationary member 13 is locked, and the stationary member 13 at the fixed position is moved in an opposite direction to the fixed direction by a fixing release means 16 to release the fixed image read means 12 and to allow the lock means 17 to lock the means 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image forming apparatus, and more particularly to a fixing structure of image reading means when the image forming apparatus is transported.

[0002]

2. Description of the Related Art Conventionally, there is an image forming apparatus provided with an image reading means for placing a sheet on an upper surface of a main body while being arranged below the sheet and moving in a scanning direction to read an image of the sheet. In such an image forming apparatus, particularly, an image reading means such as a mirror scanning table is precisely assembled.

Therefore, when a strong external force such as vibration is applied at the time of product shipment or movement of the apparatus, the mirror or lens is shaken and displaced, so that good image formation is not performed. Therefore, in order to prevent this, conventionally, a transport lock screw for locking and fixing the lens and the mirror base has been tightened in advance and shipped. The transport lock screw is designed to be easily detachable by a user, and can be copied by removing the lock screw at the time of initial installation.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image forming apparatus having better lock performance than a conventional image forming apparatus.

[0005]

According to the present invention, there is provided an image forming apparatus for reading an image of a sheet by placing an image on a top surface of a main body and moving an image reading means disposed below the sheet. A fixing member that is movably provided on the main body so as to fix the image reading unit, and that moves the main body to a position where the image reading unit is fixed, and biases the fixing member to move to the fixing position. The urging means, which normally locks the fixing member while resisting the urging force of the urging means, moves in the direction of releasing the locking of the fixing member during the movement of the main body, and moves after the main body moves. A locking means for returning to a position for locking the fixing member, and after the main body is moved, the fixing member moved to the fixing position is moved in a direction opposite to a fixing direction to release the fixing of the image reading means. Solid It is characterized in that it comprises a release means.

Further, the present invention is characterized in that after the fixing member is moved in the fixing releasing direction by the fixing releasing means, it is locked again by the locking means which has returned to the position for locking the fixing member. Things.

Further, in the present invention, the locking means has a locking portion for locking the fixing member, and the locking portion returns to a position where the locking means locks the fixing member. While entering the moving path of the fixing member and being retracted and rotated by being pressed by the fixing member moved by the fixing releasing means, returning to lock the fixing member after the fixing member passes. It is configured to move.

Further, in the present invention, the locking means moves downward to retract the locking portion from a moving path of the fixing member in accordance with a lifting operation of the main body when the main body is moved. Is what you do.

Further, the present invention is characterized in that vibration detecting means for detecting that vibration is applied to the main body is provided, and the locking portion is retracted from the moving path of the fixing member by the vibration detecting means. Things.

Further, in the present invention, the fixing releasing means is a solenoid.

Further, according to the present invention, the fixing releasing means includes an eccentric cam for pressing the fixing member, and a driving means for rotating the eccentric cam.
The fixing member moved to the fixing position is pressed by an eccentric cam rotated by the driving means, and is moved to a fixing releasing position.

Further, according to the present invention, the driving means has a toothless gear for rotating the eccentric cam, and a transmission gear for transmitting a driving force to the toothless gear, and the eccentric cam connects the fixing member. After being moved to the fixing release position, rotation is stopped by the missing tooth portion of the missing tooth gear.

According to the present invention, a fixing member for moving an image reading means for reading an image of a sheet placed on the upper surface of the main body when the main body is moved is provided on the main body so as to be movable. The fixing member is urged by the urging means to move to the fixed position. Normally, the fixing member is locked by the locking means while resisting the urging force of the urging means, and when the main body is moved, the locking means is moved in a direction for releasing the locking of the fixing member. Thereby, the fixing member is moved to a position where the image reading unit is fixed.
After the main body is moved, the locking means is returned to the position for locking the fixing member, and the fixing member at the fixing position is moved in the direction opposite to the fixing direction by the fixing releasing means to release the fixing of the image reading means. At the same time, and locked by the locking means.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view for explaining an overall configuration of an electrophotographic image forming apparatus which forms an image using an electrophotographic image forming method as an example of an image forming apparatus according to a first embodiment of the present invention. FIG. In FIG. 1, reference numeral A denotes an electrophotographic image forming apparatus. The electrophotographic image forming apparatus A includes an image reading unit 1, a photosensitive drum 7 serving as an image carrier, a developing unit 9, a fixing unit 5, and the like. .

Here, the image reading means 1 includes a sheet (not shown) placed on a document glass 1a provided on an upper surface of an electrophotographic image forming apparatus main body (hereinafter, referred to as an apparatus main body) A1 with its image surface facing downward. The original is irradiated with light from a light source 1b, and reflected light of the original is reflected by first, second and third mirrors 1.
e, 1f, 1g, the focusing lens 1d, and the fourth and fifth mirrors 1c, 1c 'to irradiate the photosensitive drum 7 in the process cartridge B to form a latent image. Thereby, a visible image is formed as a toner image.

Incidentally, in synchronization with the formation of the toner image, the recording medium 2 is transferred from the paper feed cassette 3a to the pickup roller 3
b, a reversing roller 3c, and a conveying means 3 including a conveying roller pair 3d, a registration roller pair 3e, and the like. Thereafter, in the image forming section, the toner image formed on the photosensitive drum 7 is transferred to the recording medium 2 by the transfer roller 4 as a transfer unit.

Thereafter, the recording medium 2 is transported by the transport belt 3f to the fixing rotator 5a which receives heat from the heater.
And a driving roller 5b that presses and conveys the recording medium 2 to the fixing rotator 5a, and is applied when passing between the fixing rotator 5a and the roller 5b. The toner image is fixed on the recording medium 2 by heat and pressure. The recording medium 2 that has passed the fixing unit 5 is discharged to a discharge tray 6.

In the process cartridge B constituting the image forming means, the photosensitive drum 7 having the photosensitive layer is rotated, and the surface thereof is uniformly charged by applying a voltage to a charging roller 8 serving as a charging means. The light image from the means 1 is exposed to the photosensitive drum 7 through an exposure opening to form a latent image, and is developed by the developing means 9.

The developing means 9 sends out the toner in the toner reservoir 9a by a toner sending member 9b, rotates a developing roller 9c containing a fixed magnet, and removes the toner layer to which a triboelectric charge is applied by a developing blade 9d. The toner image is formed on the surface of the developing roller 9c, and the toner is transferred to the photosensitive drum 7 in accordance with the latent image, thereby forming a toner image and visualizing the toner image.

After the transfer roller 4 transfers the toner image to the recording medium 2 as described above, the process cartridge B removes the toner remaining on the photosensitive drum 7 by the cleaning blade and collects the waste toner. The toner remaining on the photosensitive drum 7 is removed by the cleaning means 10 for collecting the toner.

In the figure, reference numeral 11 denotes a first mirror base for holding the first mirror 1e, and reference numeral 12 denotes a second mirror base for holding the second and third mirrors 1f and 1g. , 12 are provided with an optical motor (not shown) and an optical wire (not shown) driven by a gear train.

When reading an original, the optical motor is operated, and the mirror tables 11 and 12 are moved and scanned in the direction of arrow C from the image reading start position shown in FIG. When the original is read, an arrow D is displayed.
, And returns to the image reading start position again.

On the other hand, in FIG. 1, reference numeral 20 denotes a lock device for locking (fixing) the image reading means 1, specifically, the mirror bases 11 and 12, and 13 oscillates (moves) with an oscillating shaft 14 as a fulcrum. A lock member 12a, which is a fixing member, is an engagement portion. The engagement portion 12a is provided on a side portion of the second mirror base 12 so as to be engaged with the lock member 13. Note that the lock member 13 and the engagement portion 12a are
It constitutes a part of the lock device 20.

Here, at the upper end of the lock member 13,
As shown in FIG. 2, a lock claw 13 a that engages with the engagement portion 12 a of the second mirror base 12 is formed. The lock member 13 is urged in a clockwise direction by a lock spring 15 which is an urging means attached between the lock claw 13a and the swing shaft 14, and as described later, the device body A1 is urged. When moving, the lock spring 15 swings clockwise so that the engagement portion 12a of the second mirror base 12 is moved.
And is adapted to be engaged.

Further, a plunger 16a of a solenoid 16, which is an example of a fixing releasing means, is connected to the lower end of the lock member 13, and after the apparatus main body A1 is moved as described later, the power is turned on, and the copy is performed. When the button is pressed, the solenoid 16 operates for a predetermined time, whereby the lock member 13 swings in a direction in which the engagement with the second mirror base 12 is released, that is, in a counterclockwise direction. It moves to the lock release position shown.

In the same figure, reference numeral 30 denotes an opening 30a.
An optical frame plate provided with the first and second mirror bases 11,
When the second mirror stand 12 is at the reading start position,
Is in a state of protruding from the opening 31a. When the lock member 13 swings due to the protruding engagement portion 12a, the lock claw 13a
Are adapted to engage.

On the other hand, reference numeral 17 denotes a slide bar which is a locking means which comes into contact with the lower end of the lock member 13 to prevent the lock member 13 from swinging in the locking direction. The main body 17b, a return spring 17c, and a projection spring 17g are provided. The slide bar 17, the solenoid 16, and the lock spring 15 form another part of the lock device 20.

Here, the rotating portion 17a is rotatably supported at the upper end of the main body portion 17b.
When the lock member 13 returns from the lock position to the lock release position after moving the apparatus main body A1 as described later, a direction orthogonal to the swing direction of the lock member 13 is provided. It is designed to retreat and rotate. Thereby, the lock member 13 can return to the lock release position through the slide bar 17.

The rotating portion 17a is connected to the main body 17b.
When the lock member 13 passes and the pressing by the lock member 13 is released, the return spring 17c prevents the lock member 13 from swinging in the locking direction shown in FIG. It returns to the original state and rotates.

When the rotating portion 17a returns to the original state, the lock member 13 which returns to the lock position by the urging force of the lock spring 15 with the stop of the operation of the solenoid 16 after a predetermined time elapses, As shown in FIG. 3, it comes into contact with the abutting portion 17e formed on the rotating portion 17a, so that the locking member 13 is prevented from swinging in the locking direction.

In the drawing, reference numeral 17h denotes a contact portion of the rotating portion 17a with which the pressing surface 13b of the locking member 13 contacts when the locking member 13 passes while pressing the rotating portion 17a. The abutting portion 17h is provided with a tapered surface so that the lock member 13 can reliably pass through the rotating portion 17a while retreating and rotating. Further, the pressing surface 13b of the lock member 13 is also provided with a tapered surface.

The main body 17b is provided with a protruding spring 17g.
1, the lower end portion 17f is urged to project from the hole 18 formed in the bottom plate A2 of the apparatus main body A1. Normally, when the apparatus main body A1 is installed, the lower end of the main body portion 17b comes into contact with an installation surface (not shown), so that the slide bar 17 compresses the projecting spring 17g while holding the locking member 13 in place. It is in a state in which swinging is prevented.

On the other hand, when the apparatus main body A1 is moved, when the apparatus main body A1 is lifted, the main body 1 is moved by the projecting spring 17g.
7b moves in the direction in which the lower end portion 17f protrudes, and when the main body portion 17b moves downward in this way, the rotating portion 17a also moves downward, whereby the contact with the lock member 13 is released. Thereby, the lock member 13 moves in the lock direction by the urging force of the lock spring 15, and the lock claw 13a is engaged with the engagement portion 12a.

The first mirror base 11 is connected to the second mirror base 1
2 is connected to the second mirror base 1 by an optical wire.
At the same time as 2 is locked, the first mirror base 11 is also locked. Therefore, even when an external force due to transportation is applied, neither of the mirror stands 11 and 12 moves.

On the other hand, when the apparatus is transported and the apparatus main body A1 is placed on the floor again, the slide bar 17 is pushed back from the floor, and the rotating portion 17a enters into the swing path which is the moving path of the lock member 13. It will be in the state of having done.

When the power is turned on and the copy button (not shown) is pressed after the apparatus main assembly A1 is installed, a sensor (not shown) detects that the second mirror base 12 is at the lock position, and thereby the solenoid 16 Operates, and as described above, the lock member 13 swings and the engaging portion 12a
Is released from. Thereby, the second mirror base 12 can be moved.

After that, when the energization of the solenoid 16 is completed, the lock member 13 tries to swing in the lock direction by the lock spring 15, but at this time, the rotating portion 17 has already been rotated.
Since a has entered the rocking path of the lock member 13,
The movement of the lock member 13 in the locking direction is prevented by the rotating portion 17a.

Next, the apparatus main body A1 constructed as described above
Will be described.

Normally, the slide bar 17 is at a position where the lock member 13 is locked as shown in FIGS. 1 and 2, whereby the second mirror base 12 is movable.

On the other hand, as shown in FIG. 4, when the apparatus main body A1 is lifted for carrying (moving), the slide bar 17 slides by a predetermined amount in a direction in which the lower end portion 17f is protruded by the protruding spring 17g, that is, downward. As a result, the rotating portion 17a also moves downward, and the contact with the lock member 13 is released. Thereby, as shown in FIG.
Is rocked in the locking direction by the lock spring 15 and engages with the engaging portion 12a of the second mirror base 12. Thereby, the lock of the second mirror base 12 is established.

On the other hand, after the second mirror base 12 is locked in this way, transport is performed, and the apparatus main body A1 is again placed on the floor, and the slide bar 17 is pushed back from the floor, and
As shown in FIG. 6, the rotating portion 17a enters a state in which the locking member 13 swings. At this time, the second mirror base 12 remains locked.

In this state, when the power is turned on again and the copy button is pressed, the solenoid 16 operates based on the detection signal from the sensor. As a result, as shown in FIG. 7, the lock member 13 swings counterclockwise to
2a, the second mirror base 12 can be moved.

When the lock member 13 swings as described above, the rotating portion 17a is rotated by being pressed by the lock member 13 and retreats from the swing path of the lock member 13, but the lock member 13 passes. After that, it returns to the vertical state shown in FIG. 2 again. Then, as the rotating portion 17a returns to the vertical state, the locking member 13 is prevented from swinging in the locking direction.

As described above, while the lock member 13 is normally locked by the slide bar 17 while resisting the urging force of the lock spring 15, the lock by the slide bar 17 is released when the apparatus body A1 is moved. The second mirror base 12 can be fixed by the lock member 13.

Thus, when the user moves the apparatus main body A1 over a long distance and a long time, for example, when the user moves.
Even if you forget to attach the transport lock screw or turn off the power during copying, and the mirror table is transported regardless of the mirror table being in the middle of scanning, the mirror table shifts and the image deteriorates Such a phenomenon can be prevented from occurring. In addition, the lock screw for the scanning mirror for transportation is not required, and the trouble of mounting and removing the lock screw can be omitted.

In the above description, the lock operation is performed when the apparatus main body A1 is lifted. However, the present invention is not limited to this, and the lock operation is performed when the apparatus main body A1 is lifted. Device body A1
The lock operation can be performed similarly even when vibration is applied to the motor.

Next, such a second embodiment of the present invention will be described.

FIG. 8 is a perspective view of a main part of the image forming apparatus according to the present embodiment, in which reference numeral 40 denotes a vibration detecting means.
And a support spring 23, one end of which is fixed to the lower surface and the other end of which is fixed to a bottom plate A2 of the apparatus main body. Note that the weight 21 is normally placed on the bottom plate A2 of the apparatus main body A1 via the support spring 23 by its own weight.

On the other hand, reference numeral 22 denotes a connecting string whose one end is fixed to the rotating portion 17a of the slide bar 17, and the other end of the connecting string 22 is fixed to the upper surface of the weight 21. Here, the connecting string 22 is connected to the horizontal bar 25 and the apparatus main body A1.
Through the vertical hole 26 formed in the frame A4, the rotating portion 17a and the weight 21 are connected almost without slack. Note that the vertical hole 26 is located almost directly above the weight 21, and the connection string 22 is substantially vertical between the vertical hole 26 and the weight 21.

Then, with this configuration,
When vibration, particularly rolling, is applied to the apparatus main body A1, FIG.
As shown in the figure, the weight 21 swings relatively to the apparatus main body A1 due to its inertia. At this time, the support spring 23 is also
, But the amount of extension is set to such an extent that it hardly extends from the close contact state. Thus, the turning portion 17a is pulled via the connecting cord 22 by the lateral displacement of the weight 21.

Here, the rotating portion 17a pulled by the weight 21 does not displace in the vertical direction, but rotates at that position in the direction of releasing the contact with the lock member 13.
Thereby, the lock member 13 is moved to the lock position by the lock spring 15.

On the other hand, when the horizontal swing of the apparatus main body A1 is reduced, the support spring 23 is also restored to the vertical position in time against the weight of the weight 21. As a result, the weight 21 also returns to the original position, and the rotating portion 17a is rotated by being pulled by the connecting string 22 accordingly.
Also returns to the vertical state.

Here, the state when the rotating portion 17a returns to the rotating state is the same as that in FIG. 6 described above. Thereafter, when the copy button is pressed again, the return solenoid 1
6, whereby the lock member moves to the lock release position while rotating the rotating portion 17a as shown in FIG.

FIG. 11 shows the operation when the apparatus main body A1 is lifted. The slide bar 17 slides down and the lock member 13 is locked. At this time, the weight 21 and the support spring 23 can be displaced upward by the connecting string 22 and do not hinder the operation of the slide bar 17.

As described above, the mirror stand 11 can be automatically locked when the apparatus main body A1 is transported, and at the same time, the vibration detecting means 40 can be automatically locked against a severe roll such as an earthquake. Also, the connecting string 22 is
Through the vertical hole 26 located almost right above, the locking operation can be performed regardless of the direction in which the device main body A1 rolls 360 °. The release is also automatically released by operating the copy button.

Next, a third embodiment of the present invention will be described.

FIG. 12 is a perspective view of a main part of the image forming apparatus according to the present embodiment. In FIG. 12, reference numeral 27 denotes a release cam which is an eccentric cam, and reference numerals 28 and 29 denote driving means for rotating the release cam 27. The missing tooth gear and the connection gear that is the transmission gear. Here, the release cam 27 is provided with the toothless gear 28.
The lock member 13 is pressed for a predetermined period during one rotation with the toothless gear 28.

The connecting gear 29 rotates the release cam 27 via the toothless gear 28 while meshing with the toothed portion 28a of the toothless gear 28. The connecting gear 29 rotates by receiving a rotational force from the gear train of the optical motor of the apparatus main body A1, for example, and is not provided exclusively for locking.

FIG. 7 shows a normal unlocked state. In this state, the release cam 27 is positioned at its own center of gravity, and the most protruding portion 27a (the position of the V mark) is rotated by the rotation shaft 27b.
, And the cam surface is separated from the lock member 13. At this time, the toothless gear 2
Reference numeral 8 denotes a state in which the missing tooth portion 28b faces the connecting gear 29, and thus the missing tooth gear 28 and the connecting gear 29 are not engaged. Therefore, even if the connecting gear 29 rotates, the release cam 27 is not driven.

On the other hand, when the apparatus main body A1 is lifted upward from this state, as shown in FIG.
7 slides and retreats downward in the same manner as in the first embodiment, for example, and the lock member 13 swings accordingly,
Reach the lock position. Here, the lock member 13
Swings, the lower end surface of the lock member 13
Of the cam surface.

When the cam surface is pressed by the lock member 13 as described above, the release cam 27 rotates clockwise by approximately 45 °, and accordingly, the toothless gear 28 rotates together with the release cam 27, and The toothed portion 28a of the tooth gear 28 meshes with the connection gear 29. After this, the device body A
When the slide bar 1 is installed, as shown in FIG.
7 returns to the original position as in FIG. At this time, the release cam 27 does not rotate.

When the copy button is pressed after the power is turned on in this state, the driving gear (not shown) rotates the connecting gear 29 in a counterclockwise direction.
By the rotation of No. 9, the toothless gear 28 and the release cam 27 rotate clockwise as shown in FIG. Note that the state of FIG. 15 shows a halfway progress of approximately 45 ° rotation with respect to FIG.

When the connecting gear 29 and the toothless gear 28 continue to rotate further, the most protruding portion 27a of the release cam 27 gradually approaches the locking member 13 as shown in FIG. Start pressing 13.
Thereby, the pressing surface 13b (see FIG. 3) of the lock member 13 and the contact portion 17h (see FIG. 3) of the rotating portion 17a come into contact with each other, and the rotating portion 17a starts rotating.

Further, when the release cam 27 rotates, the lock member 13 completely slides through the rotating portion 17a, whereby the rotating portion 17a returns to the vertical state, and the locking member 13
Lock prevention state.

Since the toothless gear 28 rotates thereafter, the release cam 27 is separated from the end of the lock member 13 again. Finally, the engagement with the connection gear 29 is completed, and the weight returns to the posture shown in FIG. After that, even if the drive source of the connection gear 29 continues to operate for the copy operation, the connection gear 29
Since the toothless gear 28 is not rotated, the position of the release cam 27 is maintained as it is. The automatic release is performed by the above operation.

Then, with this configuration,
Even if the solenoid 16 dedicated to unlocking is omitted, a lock device that can be automatically unlocked using a sequence at the time of image formation can be realized by receiving the supply of rotational force from the gear train of the motor of the apparatus main body, and can be realized at lower cost. is there.

In each of the embodiments described above, an image reading section such as a copying machine, that is, mirror bases 11 and 12 has been described as an example of a movable section. However, the present invention is not limited to this, and a zoom lens may be used. It can also be applied to a table, a blank exposure table, and the like. Further, the present invention is effective not only for copying machines but also for image forming apparatuses in general.

[0069]

As described above, according to the present invention, when the main body is moved, the locking of the fixing member is released, and the fixing member is moved to the position for fixing the image reading means.
The image reading means can be automatically fixed before transportation, so that the user can be prevented from forgetting to lock, and the transportation lock screw can be omitted.

After the main body is moved, the fixing member at the fixing position is moved in the direction opposite to the fixing direction by the fixing releasing means to release the fixing of the image reading means.
Unlocking can also be done automatically.

Further, since the automatic locking can be performed even against a severe vibration such as an earthquake, it is possible to prevent the apparatus from malfunctioning even if the vibration due to the earthquake or the collision of a person or an object is applied.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration of an electrophotographic image forming apparatus as an example of an image forming apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective view illustrating a configuration of a lock device of the electrophotographic image forming apparatus.

FIG. 3 is a plan view of a rotating portion and a lock member of a slide bar constituting the lock device.

FIG. 4 is a cross-sectional view illustrating a state when the image forming apparatus is lifted from a floor surface.

FIG. 5 is a perspective view showing a state when a lock member of the lock device is engaged with an engagement portion of a second mirror base.

FIG. 6 is a perspective view showing a state in which a slide bar of the lock device is pushed back from a floor surface, and a rotating unit enters a swing path of a lock member.

FIG. 7 is a perspective view showing a state when the lock of the lock device is released.

FIG. 8 is a perspective view illustrating a configuration of a vibration detecting unit of an image forming apparatus according to a second embodiment of the present invention.

FIG. 9 is a perspective view illustrating a state in which the weight of the vibration detecting means swings relatively to the apparatus main body due to vibration.

FIG. 10 is a perspective view showing a state where a lock member of a lock device provided in the image forming apparatus moves to a lock release position.

FIG. 11 is a perspective view showing a state of a lock device and a vibration detecting unit when the image forming apparatus is lifted.

FIG. 12 is a perspective view illustrating a configuration of a lock device of an image forming apparatus according to a third embodiment of the present invention.

FIG. 13 is a perspective view showing a state of the lock device when the image forming apparatus is lifted.

FIG. 14 is a perspective view showing a state of the lock device when the image forming apparatus is installed.

FIG. 15 is a perspective view showing a state in which a release cam of the lock device rotates.

FIG. 16 is a perspective view showing a state in which a release cam of the lock device approaches a lock member.

[Explanation of symbols]

 A Image Forming Apparatus A1 Apparatus Main Body A2 Bottom 1 Image Reading Means 11 First Mirror Base 12 Second Mirror Base 12a Locking Part 13 Locking Member 15 Lock Spring 16 Solenoid 17 Slide Bar 17a Rotating Part 17c Return Spring 21 Weight 23 Support Spring 27 release cam 28 missing tooth gear 28a toothed portion 29 connecting gear 40 vibration detection means

Claims (8)

[Claims] 1. An image forming apparatus for reading an image of a sheet by placing a sheet on an upper surface of a main body and moving an image reading unit disposed below the sheet, wherein the image reading unit is fixed. A fixing member movably provided on the main body, the fixing member moving to a position for fixing the image reading means when the main body moves, and an urging means for urging the fixing member to move to the fixing position. While the fixing member is locked while resisting the urging force of the urging means, when the main body is moved, the fixing member is moved in a direction to release the locking, and after the main body is moved, the fixing member is locked. Locking means that returns to a position where the image reading means is moved to the fixing position after the main body is moved, and fixing means which releases the fixing of the image reading means by moving the fixing member moved to the fixing position in a direction opposite to a fixing direction. An image forming apparatus comprising and. 2. The fixing device according to claim 1, wherein the fixing member is moved in the fixing releasing direction by the fixing releasing device and then locked again by the locking device that has returned to the position for locking the fixing member. The image forming apparatus as described in the above. 3. The locking means has a locking portion for locking the fixing member, and the locking portion fixes the fixing member when the locking means returns to a position for locking the fixing member. While entering the movement path of the member, the member is pressed by the fixing member moved by the fixing releasing means and retreats and turns, and after the fixing member passes, the member returns and turns to lock the fixing member. The image forming apparatus according to claim 1, wherein: 4. The apparatus according to claim 1, wherein said locking means moves downward to retreat said locking portion from a moving path of said fixed member in accordance with a lifting operation of said main body when said main body is moved. An image forming apparatus according to any one of claims 1 to 3. 5. The apparatus according to claim 3, further comprising: vibration detecting means for detecting that vibration has been applied to the main body, wherein the vibration detecting means retracts the locking portion from a moving path of the fixing member. The image forming apparatus as described in the above. 6. An image forming apparatus according to claim 1, wherein said fixing releasing means is a solenoid. 7. The fixing release means includes an eccentric cam for pressing the fixing member and a driving means for rotating the eccentric cam, and the fixing member is moved to the fixing position when the main body is moved. 2. The image forming apparatus according to claim 1, wherein the member is pressed by an eccentric cam rotated by the driving unit, and is moved to a fixed release position. 8. The driving means has a toothless gear for rotating the eccentric cam, and a transmission gear for transmitting a driving force to the toothless gear, wherein the eccentric cam fixes the fixing member to a fixing release position. 8. The image forming apparatus according to claim 7, wherein the rotation is stopped by the missing tooth portion of the missing tooth gear after being moved to the second position.