JPH056040A - Image forming device - Google Patents

Abstract

PURPOSE:To provide an image forming device having a hinge part which is obtained by improving the hinge part of an opening and closing cover, can open and close at about 180 deg., and is not exposed to outside appearance and with which the covers do not mutually and impactively contact. CONSTITUTION:One end of an arm A32 and one end of an arm B33 are pivotally supported to members 35 and 39, 37 and 41, which are erectly provided on a main body cover 30 and the opening and closing cover 31, with the center of rotation 38 and the center of rotation 36, respectively. The other ends of the respective arms A32 and B33 are engaged with sliding grooves 40 and 42 through pins 32a and 33a. Then, both arms are rotatably combined through a hinge pin 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus provided with a door-shaped opening / closing cover mounting device.

[0002]

2 is a longitudinal sectional view of a laser beam printer which is an electrophotographic image forming apparatus which is the background of the present invention.
3 shows.

A frame 3 holds a laser scanner 1 for scanning a laser beam, a process unit 2 including a photosensitive drum 2a, a developing device 2b, a cleaning device 2c, a charging device 2d and the like. The image signal sent from the laser scanner 1 is rotated in the direction of the arrow in the drawing and written on the photosensitive drum 2a that is uniformly charged by the charger 2d to form a latent image, which is developed by the developing device 2b.
The sheet S is fed from the cassette 4 storing the sheet S to the sheet feeding roller 5
The sheets are separated and fed one by one, the skew and the like are corrected by the registration roller pair 6, and then the image is transferred to the transfer portion between the photosensitive drum 2a and the transfer roller 7, and then the fixing device 8 is provided.
It is fixed by and is discharged to the paper discharge unit 9.

The process unit 2 is inserted from an opening 10 provided in the main body of the apparatus, guided by a guide formed on the frame 3, and advanced to a predetermined position for positioning. An opening / closing cover 22 is arranged in the opening 10 so as to be rotatable around a hinge 23 attached to the main body cover 21, and opens and closes when the process unit 2 is attached or detached.
Further, a pressure spring (not shown) is attached to the opening / closing cover 22, and when the opening / closing cover 22 is closed, pressure is applied to the process unit 2 so that the position of the process unit 2 is changed and the image is adversely affected. prevent.

In such a structure, since the laser scanner 1 is fixed, it is easy to guarantee the image writing position and the depth of focus, is not easily affected by vibration, and only the opening / closing cover 22 is opened / closed. It has the feature of being easy to open and close.

[0006]

In the conventional device, as shown in FIG.
As shown in FIG. 3, the opening / closing cover 22 occupies a large area in order to make it easy to take out the process unit 2 and to facilitate the jam processing. On the other hand, when opening a large cover, for example, if the cover is only opened up to about 90 °, if a force acts in the direction to further open the cover, an excessive force acts on the hinge portion and there is a great risk of breaking. 23, the position of the alternate long and short dash line 24;
It will be opened to the hit position. 18 like this
When the hinge is rotatable near 0 °, when the opening / closing cover 22 is closed, the hinge 23 is exposed to the outside, which is a design limitation, and when the opening / closing cover 22 is opened, the cover 21 is exposed to a shocking force. , 22 There was a problem that they would come into contact with each other and cause scratches.

According to the present invention, the hinge portion of the opening / closing cover of the image forming apparatus is improved so that it can be opened / closed by about 180 °, and the cover portions do not come into contact with each other, and the hinge portion does not appear in the appearance. The purpose is to provide a device.

[0008]

A first invention of the present invention has a door-shaped opening / closing cover, and a mounting device for the opening / closing cover is arranged on the inner side, and the opening / closing cover is closed from the closed position to the outer side.
The image forming apparatus is characterized in that it can be opened.

According to a second aspect of the present invention, the opening / closing cover is located on a substantially horizontal upper surface, and a spring member for urging the opening / closing cover in the closing direction is provided in the opening / closing cover mounting device at least in a fully opened state. The image forming apparatus according to the first invention.

According to a third aspect of the present invention, in a mounting device for an opening / closing cover, an arm A having a rotation center on the opening / closing cover side and an arm B having a rotation center on the fixed body cover side are rotated by a hinge pin. The arm A is movably engaged with a slide groove provided on the body cover side, and the tip of the arm B is movably engaged with a slide groove provided on the opening / closing cover side. The image forming apparatus according to the first invention is characterized in that.

According to a fourth aspect of the present invention, when the opening / closing cover is opened, a leaf spring is provided for urging the arm A in a direction of separating from the opening / closing cover, and a leaf spring for urging the arm B in a direction of separating from the main body cover. And an urging force of a leaf spring is applied in a direction of closing the opening / closing cover.

According to a fifth aspect of the present invention, the other end of a tension spring having one end locked at the slide groove engaging portions of the arm A and the arm B is urged in the direction in which the slide groove engaging portion separates from the hinge pin. As described above, the image forming apparatus according to the second invention is characterized in that the main body cover and the opening / closing cover are respectively locked, and the biasing force of the tension spring is applied in the direction of closing the opening / closing cover.

According to a sixth aspect of the present invention, the opening / closing cover and the body cover end surface are in contact with each other, and chamfers are provided on the respective ridges on the outside of the joining surface of the opening / closing cover and the body cover, and inside the joining surface of the opening / closing cover and the body cover. The image forming apparatus according to the second aspect of the present invention is characterized in that a tension spring is applied to a boss standing near the side in a direction to draw the open / close cover and the main body cover.

[0014]

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

[Embodiment 1] FIG. 1 is a side view showing details of a mounting device for an opening / closing cover according to a first embodiment of the present invention. These are a part of the opening / closing cover of an already completed image forming apparatus, for example, a laser beam printer.

FIG. 2 is a bottom view showing a partial cross section of FIG. 1 and 2 show a state in which the open / close cover is closed.

In the figure, a main body cover 30 on the fixed side,
The open / close cover 31 is on the same plane at least in the vicinity of the mounting portion and overlaps with the overlap portion 50 provided on the main body cover 30. One end of the arm A32 is rotatably fitted by a pin to a rotation center 38 provided on members 37 and 41 which are vertically arranged on the opening / closing cover 31, and the other end is vertically arranged on the main body cover 30. There is a pin 32a that is movably fitted along a slide groove 40 that is substantially parallel to the main body cover 30 provided on the member 39. On the other hand, arm A3
The arm B33 having the same shape as that of 2 has one end rotatably fitted with a pin to a rotation center 36 provided on members 35 and 39 which are vertically erected on the body cover 30, and the other end has an opening / closing cover 31. There is a pin 33a that is movably fitted along a slide groove 42 that is substantially parallel to the opening / closing cover 31 provided on a member 41 that is vertically erected. Also, arm A3
2. The arm B33 has an axial slide 34 near its center.
b Stepped hinge pin 34 with detents 34a on both sides
Are rotatably coupled to each other so as not to move laterally. In the above description, the vertical line passing through the hinge pin 34 is left-right symmetric, and the arm A 32 and the arm B 33, the rotation centers 36 and 38, the slide grooves 40 and 42 are provided.
Etc. are symmetrical.

Next, the operating state of the opening / closing cover mounting device will be described with reference to FIGS. In the figure, reference numeral 43 is an equal-division line of an angle formed by the opening / closing cover 31 and the main body cover 30. When the open / close cover 31 is opened, the arm A 32 and the arm B are opened.
33 is restricted by the rotation centers 38, 36 and the slide grooves 40, 42 and rotates at the rotation centers 38, 36, and the pin 32
a and 33 a are hinge pins 34 in the slide grooves 40 and 41.
It slides toward the side, and as shown in the figure, it always operates symmetrically with respect to the bisector 43, and the bisected angle between the main body cover 30 and the opening / closing cover 31 becomes smaller in the order of αβγ, and the hinge pin 34 becomes a pin. It rotates counterclockwise around 36 and rises above the main body cover 30 to allow 180 ° opening and closing. Actually, the operation of the opening / closing cover 31 is stabilized only by providing another set of the above devices. Also, the main body cover 30
Even if the overlap portion 50 is provided on the side, the main body cover 30
The mounting portion side of the opening / closing cover 31 opens from the closed position and has no influence on the opening / closing. When closed, the mounting device of the opening / closing cover is not visible from the outside of the image forming apparatus.
It can be opened and closed at 80 °. To close it, reverse the above operation.

[Second Embodiment] FIGS. 6 to 10 show a second embodiment of the present invention.
It is an example of. In the figure, components having the same functions as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
Protrusions 46 and 47 are provided on the main body cover 30 and the opening / closing cover 31. The protrusions 46 and 47 are provided on the rectangular base portion having substantially the same width as that of the leaf springs 44 and 45 as a rectangular protrusion smaller than the rectangular base portion. The leaf springs 44 and 45 are provided with holes on the root side, and cuts are made from both sides of the hole in the longitudinal direction of the leaf spring, and the above-mentioned holes are irreversibly formed on the protrusion 46 of the opening / closing cover 31 and the protrusion 47 of the main body cover 30, respectively. It is inserted and fitted, has a cantilever shape, and when the opening / closing cover 31 is closed, the front ends thereof face away from the opening / closing cover 31 and the main body cover 30, respectively.

When the opening / closing cover 31 is opened, the pins 32a and 33a are slid toward the rotation centers 36 and 38.
Since it slides through 0 and 42, the end portions 49 and 48 of the arm A 32 and the arm B 33 and the leaf springs 45 and 44 start contact, and then the leaf springs 45 and 44 are pressed and bent. The deflection of the leaf spring is caused by an opening / closing angle of the opening / closing cover 31 near 180 ° (γ≈
It becomes the maximum when it becomes 0). As a reaction force of the spring force of the leaf springs 44 and 45, a force for lifting the open / close cover 31 is generated.

Arm B3 in the direction of arrows 51 and 52 in FIG.
3, the member for preventing the arm A32 from slipping cannot be integrally formed with the members 35 and 39 vertically set up from the main body cover 30, and the members 37 and 41 vertically set up from the opening / closing cover 31. This can be easily done by modifying the newly provided leaf spring. For example, as shown in FIG. 7, the slit 4 is formed in the center of the leaf springs 44 and 45.
4a and 45a are inserted, projections 48a and 49a are provided on the ends 48 and 49 of the arm A32 and arm B33, respectively, and are engaged with the slits 45a and 45b. Alternatively, the leaf spring 44,
A bent portion (not shown) is provided on the side of the root side of 45, or bent portions 44b and 45 in the directions of arrows 51 and 52 are provided at the ends.
b is provided and brought into close contact with the side surface of the rectangular base portion provided with the protrusions 46 and 47 to regulate the positions of the arm A32 and the arm B33.
With this simple device, the position of the arm can be reliably regulated, and the opening / closing cover can be opened and closed more firmly.

[Embodiment 3] FIGS. 11 to 15 show a third embodiment of the present invention. In the figure, components having the same functions as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Slide grooves 40 and 4 of arm A32 and arm B33
The tension springs 61, 64 are provided between the bosses 62, 65 provided on the opposite side surfaces at the same positions as the pins 32a, 33a contained in 1 and the hooks 60, 63 provided on the main body cover 30 and the opening / closing cover 31. It is stretched.

As the opening / closing cover 31 is opened, as shown in FIGS.
The spring force of the tension springs 61, 64 increases as the tension springs 61, 64 move away from the hooks 60, 63 by moving along 42, and a force for lifting the open / close cover 31 is generated as a reaction force. The spring force at that time may be balanced with the weight of the opening / closing cover 31.
In addition, the tension springs 61 and 64 are stretched so that the main body cover 3
0, the tension spring 6 on a plane substantially parallel to the open / close cover 31.
A moment is generated in which the distance between the springs 61 and 64 perpendicular to the tensioning direction of 1 and 64 is an arm, and the position of the arm A32 and the arm B33 in the directions of the arrows 52 and 51 is also regulated, as in the second embodiment. You can

[Fourth Embodiment] FIGS. 16 to 22 show a fourth embodiment of the present invention. 16 to 18 are three-side views showing a state in which the cover is closed, FIG. 16 is a front view, FIG. 17 is a bottom view, and FIG. 18 is a side view. Open / close cover 1 for main body cover 100
The tension spring 108, between the bosses 102, 103, 104 that are erected on the inner side of each cover near the joint surface 116 with 01 and the bosses 105, 106, 107 that are also erected on the opening / closing cover 101. 109, 110 and 111 are stretched in a zigzag pattern. The positioning boss 112 provided upright on the main body cover 100 is fitted with the V-grooved member 113 provided on the opening / closing cover 101. Body cover 1
00 and the outer cover ridge line 1 of the joint surface 116 of the open / close cover 101
Larger arc-shaped chamfers are formed on the parts 14 and 115.

FIG. 19 of the front view and FIG. 21 of the side view show a state in which the opening / closing cover 101 is opened 90 °. The tension springs 108, 109, 110, 111 extend while being twisted, and the contact lines move while the surfaces of the two ridge portions 114, 115 contact each other.

20 in a front view and FIG. 22 in a side view in FIG.
Shows the state in which the open / close cover 101 is opened 180 °. In this state, the tension springs 108, 109, 110, 1
It suffices to balance the spring force of 11 for returning and the weight of the opening / closing cover 101. In addition, positioning in the closed state is easy to provide in addition to the positioning boss 112 and the V-grooved member 113, and the opening / closing cover 1 in the closed state.
01 can be more reliably positioned with respect to the main body cover 100. Also, in the open state, the tension springs 108, 109,
In order to make 110 and 111 hard to see, a cover having a shape like a vertically split cylinder is fixed to the opening / closing cover 101 side as shown by a chain double-dashed line in FIG.
The spring can be hidden from the line of sight from above by disposing the spring so as to be evenly applied to the main body cover 100 side on the surface including the.

[0027]

As described above, (1) it has a door-shaped opening / closing cover, the mounting device of the opening / closing cover is arranged on the inner side, and it is possible to open the opening / closing cover 180 ° from the closed position to the outside. Since the image forming apparatus is characterized in that it is not visible from the outside when the opening / closing cover is closed, there is no restriction on the design of the opening / closing cover mounting device, and the member on the side to which the opening / closing cover is mounted is not restricted. It can also be dustproof because it can touch or overlap. (2) In the above (1), if the mounting device for the opening / closing cover is provided with a spring member for urging the opening / closing cover in the closing direction, in addition to the above effects, excessive force is inadvertently applied with the opening / closing cover open. Even if you do, the hinge part will not break,
Further, since the opening / closing cover and a member to which the opening / closing cover is attached do not contact with each other due to impact and are not scratched, the opening operation is easy to handle, and the opening / closing cover can be closed with a light force. (3) In the above (1), the attachment device of the open / close cover is rotatably connected by the hinge pin to the arm A having the rotation center on the open / close cover side and the arm B having the rotation center on the fixed body cover side. If the tip of the arm A is movably engaged with a slide groove provided on the body cover side and the tip of the arm B is movably engaged with a slide groove provided on the opening / closing cover side, When opening and closing the opening and closing cover, the opening and closing cover and the body cover overlap, the apparent center of rotation moves as the opening and closing cover is opened, the mounting part side is separated from each other, and the opening and closing cover and the body cover mounting part side are separated. Therefore, even if the opening / closing cover is inadvertently applied with a force, a large expanded force is not applied to the opening / closing cover mounting device. (4) In the above (2), when the opening / closing cover is opened, a leaf spring for urging the arm A in the direction of separating from the opening / closing cover, and a leaf spring for urging the arm B in the direction of separating from the main body cover are provided. When the biasing force of the leaf spring is applied in the closing direction of the opening / closing cover, a member that achieves the effect of (2) is housed in the opening / closing cover mounting device. (5) In the above (2), the other end of the tension spring having one end locked at the slide groove engaging portion of the arm A and the arm B is urged in a direction away from the hinge pin by moving the slide groove engaging portion. When the urging force of the tension spring is applied to the main body cover and the opening / closing cover respectively in the direction to close the opening / closing cover, the member that achieves the effect of (2) above is arm A and arm B side. Eliminate the force that tends to deflect toward you. Further, because of the tension spring, it is easy to balance the force in the opening direction based on the own weight of the open / close cover with the spring force. (6) In (2) above, the end faces of the opening / closing cover and the body cover are abutted against each other, and chamfers are provided on the respective ridges on the outside of the joining surface of the opening / closing cover and the body cover. When a tension spring is applied to the standing boss in the direction to draw the open / close cover and the main body cover, the open / close covers open approximately 180 ° along the chamfers of the outer side ridges of both covers, so the configuration is simple and the tension It is easy to balance the spring force of the spring with the weight of the fully opened / closed cover.

[Brief description of drawings]

FIG. 1 is a side view showing a mounting device for an opening / closing cover according to a first embodiment of the present invention.

FIG. 2 is a bottom view showing a partial cross section of FIG. 1 as viewed from below.

FIG. 3 is a side view showing an operating state of the first embodiment.

FIG. 4 is a side view showing an operating state of the first embodiment.

FIG. 5 is a side view showing an operating state of the first embodiment.

FIG. 6 is a side view showing an attachment device for an opening / closing cover according to a second embodiment.

FIG. 7 is a bottom view of FIG. 6 seen from below.

FIG. 8 is a side view showing an operating state of the second embodiment.

FIG. 9 is a side view showing an operating state of the second embodiment.

FIG. 10 is a side view showing an operating state of the second embodiment.

FIG. 11 is a view showing an attachment device for an opening / closing cover according to a third embodiment.

FIG. 12 is a bottom view of FIG. 11 seen from below.

FIG. 13 is a side view showing an operating state of the third embodiment.

FIG. 14 is a side view showing an operating state of the third embodiment.

FIG. 15 is a side view showing an operating state of the third embodiment.

FIG. 16 is a front view of an opening / closing cover attachment device of a fourth embodiment.

FIG. 17 is a bottom view of FIG. 16 seen from below.

FIG. 18 is a side view of FIG. 16 viewed from the lateral direction.

FIG. 19 is a front view showing an operating state of the fourth embodiment.

FIG. 20 is a front view showing an operating state of the fourth embodiment.

FIG. 21 is a side view of FIG. 19 seen from the lateral direction.

22 is a side view of FIG. 20 seen from the lateral direction.

FIG. 23 is a side view of a conventional example.

[Explanation of symbols]

30 body cover 31 Open / close cover 32 Arm A 33 Arm B 34 Hinge pin 36 Rotation center of arm B 38 Rotation center of arm A 40 slide groove 42 slide groove

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinji Goto             3-30-2 Shimomaruko, Ota-ku, Tokyo             Non non corporation

Claims (6)

[Claims] 1. An image having a door-shaped opening / closing cover, wherein a device for mounting the opening / closing cover is arranged on the inner side, and the opening / closing cover can be opened 180 ° to the outside from the closed position. Forming equipment. 2. The opening / closing cover is positioned on a substantially horizontal upper surface, and a spring member for urging the opening / closing cover in the closing direction is provided in the opening / closing cover attaching device at least in a fully opened state. Image forming device. 3. The opening / closing cover mounting device comprises an arm A having a rotation center on the opening / closing cover side and an arm B having a rotation center on the fixed body cover side, which are rotatably coupled by a hinge pin. The tip of the arm A is movably engaged with a slide groove provided on the body cover side, and the tip of the arm B is movably engaged with a slide groove provided on the opening / closing cover side. The image forming apparatus according to Item 1. 4. A leaf spring for urging the arm A in a direction separating from the cover when the opening cover is opened, and a leaf spring urging arm B in a direction separating from the main body cover are provided. The image forming apparatus according to claim 2, wherein a biasing force is applied in a direction of closing the opening / closing cover. 5. A main body cover for biasing the other ends of the tension springs, one end of which is respectively locked to the slide groove engaging portions of the arm A and the arm B, in a direction in which the slide groove engaging portions are separated from the hinge pins. 3. The image forming apparatus according to claim 2, wherein the image forming apparatus is locked to the opening / closing cover and a biasing force of a tension spring is applied in a direction of closing the opening / closing cover. 6. The opening / closing cover and the end surface of the body cover are abutted against each other,
A chamfer is provided on each ridge line on the outer side of the joint surface of the open / close cover and the body cover, and a tension spring is applied to the boss standing near the inner side of the joint between the open / close cover and the body cover in the direction to draw the open / close cover and the body cover. The image forming apparatus according to claim 2, wherein: