JP4496027B2 - Document crimping plate opening and closing device - Google Patents

Description

  The present invention relates to an improvement of a document pressing plate opening / closing device with a lift function that is installed in a copying machine, a printing machine, a scanner, or the like and is used for pressing a thick document.

  Conventionally, as shown in FIG. 5, for example, this kind of document crimping plate opening / closing device includes an attachment member (52) attached to the apparatus body (51) side of a copying machine or the like, and a hinge pin ( 53) and a support member (54) whose rear end portion is connected to be rotatable in the vertical direction through the support member (54), and can be rotated in the vertical direction through a support pin (55) at the front end portion of the support member (54). And a lift member (57) attached to the original pressure plate (56) (see Patent Document 1). A cam member (58) is fixed to the mounting member (52) in the vicinity of the hinge pin (53), while the lift member (57) pivots around a support pin (55) as a fulcrum. An actuating member (59) is provided at the position. The support member (54) is provided with a biasing spring (60) between the cam member (58) and the actuating member (59). The lift member (57) is biased by force in a direction overlapping the support member (54).

  In the above prior art, there may be a gap between the original platen (61) and the original platen (61) when the original pressure plate (56) is closed due to a dimensional error or assembly error of the apparatus main body (51). Therefore, in order to be able to adjust this gap, between the mounting member (52) and the lift member (57), the posture adjustment means (62) that can adjust the height position of the rear end side of the lift member (57) Is provided.

  More specifically, the posture adjustment means (62) includes an adjustment operation member (63), a horizontal movement member (64), and an elevating member (65), and the adjustment operation member (63) is an attachment member ( 52) It is screwed into a female screw hole (67) provided in the rear plate (66), and its rear end protrudes rearward of the rear plate (66). The horizontal moving member (64) is incorporated in the mounting member (52) so as to advance and retract in the horizontal direction by forward and reverse rotation of the adjusting operation member (63). The elevating member (65) is incorporated so as to be vertically movable between the hinge pin (53) and the cam member (58), and the upper end of the elevating member (65) is connected to the lift member (57). ) Is in contact with the lower surface of the rear end side. The horizontal moving member (64) is formed with a slope for lowering (68) and a slope for raising (69), and the slope for lowering (68) moves up and down as the horizontal moving member (64) advances. The lifting member (65) is lowered in contact with the member (65), and the lifting slope (69) is brought into contact with the lifting member (65) as the horizontal movement member (64) is retracted. Is linked to the lifting member (65).

JP 2003-280112 A

  Since the adjustment operation member protrudes rearward from the rear plate of the mounting member, when the adjustment operation member is operated, the elevation member is moved up and down to close the original document pressure plate. Can be easily adjusted. However, in this prior art, when the original cover is opened and closed, the lower surface of the lift member moves while being in contact with the tip of the elevating member, so that sliding friction occurs between them. If this frictional force is large, the lift member cannot be rotated smoothly, and resistance may be generated particularly when the original cover is closed, which may prevent the original cover from being reliably closed. In addition, the tip of the elevating member and the lower surface of the lift member that contacts the sliding member are easily worn by the sliding friction. If this wear occurs, the height position of the rear end side of the lift member changes, and the original cover is closed. There is a risk that a gap will be formed between the document table and the document table. For this reason, it is necessary to readjust the height position of the rear end side of the lift member, and there is a problem that it takes time and effort for maintenance.

  The technical problem of the present invention is to eliminate the above-mentioned problems and reduce the frictional force at the contact portion between the tip of the elevating member and the lift member, thereby preventing the occurrence of a gap when the original cover is closed. Another object of the present invention is to provide a document pressure plate opening / closing device that can maintain the height position of the rear end side of the lift member adjusted by the posture adjusting means for a long period of time and reduce the need for readjustment by the posture adjusting means.

In order to solve the above-described problems, the present invention is described as follows, for example, based on FIGS. 1 to 4 showing an embodiment of the present invention.
That is, the present invention relates to a document pressure plate opening / closing device, an attachment member (4) attached to the apparatus main body (2) side, and the attachment member (4) via a hinge pin (8) so as to be rotatable in the vertical direction. A support member (5) having an end connected thereto, and a lift which is connected to the front end of the support member (5) via a support pin (9) so as to be pivotable in the vertical direction and attached to the original pressure plate (3). A biasing spring (17) is disposed on the support member (5), and the lift member (6) is supported by the elastic force of the biasing spring (17). ) And a posture adjusting means (23) for adjusting the height position of the rear end side of the lift member (6) between the mounting member (4) and the lift member (6). The position adjusting means (23) includes an elevating member (26) that moves up and down along the mounting member (4), and an elevating member (26) of the elevating member (26). Up and down An adjustment operation member (24) for adjusting the position, and a rotary contact member (27) is rotatably disposed at the upper end of the elevating member (26), and the rotary contact member (27) is The lift member (6) is configured to be capable of coming into contact with the rear end side from below.

By operating the adjustment operation member, the lifting member moves up and down, and the lift member is pressed from below by the rotating contact member disposed at the upper end portion thereof. The vertical position is adjusted.
When the lift member rotates around the hinge pin together with the support member when opening and closing the original cover, the lower surface of the lift member moves on the rotation contact member while contacting the rotation contact member. During this movement, the rotating contact member rotates at the tip of the elevating member, so that a rotational friction force is generated between the rotating contact member and the lift member. Since this rotational friction force is much smaller than the sliding friction force generated in the prior art, the above-mentioned lift member rotates smoothly and is generated at the contact portion between this lift member and the rotation contact member. Wear is greatly reduced.

  The adjustment operation member may be directly linked to the elevating member. However, the posture adjustment means is further provided with a horizontal movement member supported by the attachment member so as to be movable in the horizontal direction. The adjustment operation member may be configured so that the vertical position of the elevating member can be adjusted via the horizontal movement member. In this case, since the adjustment operation member can be disposed at a horizontal position of the attachment member, for example, it can be disposed on the side of the attachment member. However, the height position of the lift member is adjusted so as to eliminate the gap between the original pressure plate and the original platen. The adjustment operation can be easily performed in the closed state, which is more preferable.

  In this case, the horizontal moving member and the elevating member can be linked using, for example, a gear structure or a screw structure, but at least one portion where the horizontal moving member and the elevating member abut each other. Forming a push-up cam surface such as an inclined surface is preferable because the horizontal movement of the horizontal movement member can be converted into the upward movement of the elevating member with a simple configuration.

  In addition, it is also possible to form a pressing cam surface in a portion where the horizontal moving member and the elevating member are in contact with each other. However, the lift member is urged in the direction overlapping the support member by the elastic force of the urging spring. Therefore, the rotary contact member at the upper end of the elevating member is moved downward by the lift member. A pressing force is applied. Therefore, even if the pressing cam surface is omitted, the lifting member can be lowered by the pressing force of the lifting member as the horizontal moving member moves horizontally.

  The elevating member can be arranged so as to be vertically movable between the hinge pin and the cam member. However, if this elevating member is arranged behind the hinge pin, the elevating member can be formed thick without interfering with the support member, and the above rotating contact member can be easily and securely supported by this elevating member. This is preferable. Further, in this case, since the distance from the support pin serving as a fulcrum of rotation of the lift member to the rotation contact member is increased, there is an advantage that the lift member can be lifted with a light lifting force of the lift member.

  The elevating member can be formed of a metal material such as a sheet metal, or can be formed by combining a plurality of materials. However, when the elevating member is made of a synthetic resin, it can be easily molded even if it has a relatively complicated shape, which is preferable because it can be implemented at low cost.

  Since the present invention is configured and operates as described above, the following effects can be obtained.

(1) When the document crimping plate is opened and closed, sliding frictional force is prevented from being generated between the lift member and the rotation contact member of the posture adjusting means, and the lift member and the like are smoothly rotated. Can do. As a result, the original cover can be accurately closed to an appropriate closing position, and a gap generated between the original plate and the original table can be reliably prevented.

(2) Since the wear generated at the contact portion between the lift member and the rotating contact member is significantly reduced as compared with the above-described conventional technology, the height position on the rear end side of the lift member adjusted by the posture adjusting means Can be maintained over a long period of time, and the need for readjustment by the posture adjusting means can be reduced to simplify the maintenance.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of a document crimping plate opening / closing device of the present invention, FIG. 1 is a sectional view of the document crimping plate opening / closing device showing a state in which the document crimping plate is closed, and FIG. FIG. 3 is a partially cutaway perspective view of a mounting member incorporating a posture adjusting means, FIG. 4 shows the operation of a rotating contact member, and FIG. 4 (a) is a lift member. FIG. 4B is an enlarged cross-sectional view in the vicinity of the rotary contact member for explaining the opening / closing operation of the lift member.

  As shown in FIG. 1, the document crimping plate opening / closing device (1) includes an apparatus main body (2) such as a copying machine, and a document crimping plate that is opened and closed with respect to the apparatus main body (2). It is mounted between (3).

  In other words, the document pressing plate opening / closing device (1) includes an attachment member (4), a support member (5), and a lift member (6). The attachment member (4) is screwed to the device body (2). 7) and so on. The support member (5) has a rear end pivotally connected to the mounting member (4) via a hinge pin (8) so as to be rotatable in the vertical direction. The lift member (6) is pivotally connected to the front end of the support member (5) via a support pin (9) so as to be pivotable in the vertical direction, and the original document is crimped to the lift member (6). The rear end of the plate (3) is attached with a screw or the like.

The mounting member (4) has a stopper pin (10) supported in parallel with the hinge pin (8) at a lower position in front of the hinge pin (8), and a cam member (11) around the stopper pin (10). ) Is fixed.
On the other hand, an operating member (12) is fixed to the front end portion of the lift member (6), and a laterally long hole (13) and a vertically long hole (14) are formed in the operating member (12). The support pin (9) is composed of a first support pin (9a) and a second support pin (9b) which are parallel to each other, and the first support pin (9a) is placed in the horizontally elongated hole (13). The second support pins (9b) are inserted through the vertically long holes (14), respectively.

  The support member (5) has a cam follower (15) and a spring receiver (16) formed into a bottomed cylindrical shape made of polyacetal resin or polyamide resin having excellent wear resistance, and the opening faces each other. And is slidably fitted in the front-rear direction. An urging spring (17) is interposed between the cam follower (15) and the spring receiver (16), and the cam follower (15) is configured as described above by the elastic force of the urging spring (17). The spring receiver (16) is pressed toward the actuating member (12).

  As shown in FIG. 1, in a state where the original cover (3) is fully closed, the convex portion (18) provided on the cam follower (15) is formed on the cam surface (19) of the cam member (11). The support member (5) is urged to rotate in the closing direction. On the other hand, the contact surface (20) with the actuating member (12) formed on the spring receiver (16) is the above-mentioned via the actuating member (12) due to the elastic force of the biasing spring (17). The lift member (6) is formed so as to rotate in a direction overlapping the support member (5). As a result, the original cover (3) to which the lift member (6) is attached is held in a closed position.

  The cam surface (19) of the cam member (11) is formed in a cam shape that gradually approaches the stopper pin (10) when the convex portion (18) of the cam follower (15) moves in the opening direction. It is. For this reason, when the original cover (3) is opened, turning force (hinge torque) in the opening direction is generated in the support member (5) by the elastic force of the biasing spring (17). As a result, the document pressing plate (3) is stably stopped and held at a predetermined opening angle where the hinge torque and the rotational force in the closing direction due to its own weight are balanced.

  As shown in FIG. 2, when the thick original (22) is placed on the original table (21) of the apparatus main body (2), the original pressing plate is placed with the support member (5) in the open position. When the front side of (3) is pushed down, the actuating member (12) pushes the spring receiver (16) against the elastic force of the biasing spring (17), and the lift member (6) becomes the support member (5). It rotates in the direction away from the direction, that is, the closing direction. As a result, the rear end side of the original document pressure plate (3) is lifted so as to be substantially parallel to the upper portion of the thick original document (22), and the entire thick original document (22) is evenly placed on the original table (21). Can be crimped with force.

  When the lift member (6) rotates in the direction away from the support member (5) against the elastic force of the biasing spring (17), the actuating member (12) has the horizontally elongated hole ( 13) moves rearward along the first support pin (9a), and the vertically elongated hole (14) rises along the second support pin (9b). As a result, the actuating member (12) rotates while drawing an elliptical orbit, and it is possible to suppress as much as possible that the thick original (22) is dragged horizontally by the original pressing plate (3).

  As shown in FIG. 1, between the mounting member (4) and the lift member (6), there is a posture adjusting means (23) that can adjust the height position of the rear end side of the lift member (6). It is provided. The posture adjusting means (23) includes an adjusting operation member (24), a horizontal moving member (25), an elevating member (26), and a rotating contact member (27).

  As shown in FIG. 3, the horizontal moving member (25) is supported on the upper surface of the rear portion of the cam member (11) fixed to the mounting member (4) so as to be movable in the front-rear direction. A first cam surface (28a) having a rearwardly inclined surface is formed on the upper surface of the horizontal moving member (25), and a fitting groove (29) is recessed on the lower surface. The inclination angle of the first cam surface (28a) with respect to the horizontal direction is preferably 30 to 45 degrees, for example, about 40, but is not limited to a specific inclination angle. By changing this inclination angle, the amount of adjustment of the adjustment member (24), that is, the amount of elevation of the elevating member (26) can be changed relative to the amount of horizontal movement of the horizontal movement member (25). Increasing the angle increases the amount of elevation, and decreasing the angle decreases the amount of elevation.

  The adjustment operation member (24) includes a disk-shaped large-diameter portion (31) at the front end of the screw body (30), and the large-diameter portion (31) is formed by the horizontal moving member (25). It is rotatably inserted into the fitting groove (29). The screw main body (30) is screwed into a female screw hole (33) formed in the rear wall (32) of the mounting member (4). The horizontal movement member (25) moves back and forth in the front-rear direction via the large diameter portion (31).

  The elevating member (26) is constrained from the front-rear direction so that the lower part can move up and down between the rear wall (32) and the rear end of the cam member (11), and the upper part is the hinge pin (8). ) Is located behind. A second cam surface (28b) having the same inclination angle as the first cam surface (28a) of the horizontal moving member (25) is formed on the lower surface of the central portion of the elevating member (26). The cam surface (28b) is in contact with the first cam surface (28a).

  The rotating contact member (27) is formed in a long roller shape on the left and right sides, and both ends are rotatably supported by the upper end portion of the elevating member (26). The rotary abutting member (27) is disposed rearward and above the hinge pin (8) so that it can abut against the rear end side of the lift member (6) from below to support it. . The horizontal moving member (25), the lifting member (26) and the rotating contact member (27) are all excellent in wear resistance such as polyoxymethylene resin (POM) and polyamide resin, and inexpensive. It is made of a synthetic resin that can be molded.

Next, the operation of the posture adjusting means will be described.
When the adjustment operation member (24) is rotated to move the horizontal movement member (25) backward, the first cam surface (28a) on the upper surface thereof causes the second cam surface (28b) of the elevating member (26). ) Is pressed. Since the elevating member (26) is restrained from the front and rear by the rear wall (32) and the cam member (11), the second cam surface (28b) is brought into contact with the first cam surface (28a) by the above pressing. The elevating member (26) moves upward by sliding upward. That is, the first cam surface (28a) and the second cam surface (28b) constitute a push-up cam surface (28) that pushes up the lifting member (26) by the horizontal movement of the horizontal movement member (25).

  As the elevating member (26) rises, as shown by the phantom line in FIG. 4 (a), the rotary contact member (27) is lifted to push up the lower surface on the rear end side of the lift member (6). At this time, the rotary contact member (27) is disposed at a position farther from the support pin (9), which is the rotation center of the lift member (6), than the hinge pin (8). The lift member (6) can be lifted with a light lifting force.

On the contrary, when the adjustment operation member (24) is rotated in the reverse direction to advance the horizontal movement member (25), the first cam surface (28a) tends to be separated from the second cam surface (28b). To do. Since the lift member (6) is biased in the direction overlapping the support member (5) by the elastic force of the bias spring (17), the rotary contact member (27) is the lift member (27). 6) It is pressed downward on the rear end side. For this reason, when the first cam surface (28a) is to be separated from the second cam surface (28b), the elevating member (26) is lowered together with the rotating contact member (27), and the lift member (6) is moved behind. The height of the end side is lowered.
The orientation of the original pressure plate (3) is such that no gap is formed between the lift member (6) and the original plate (21) when the original pressure plate (3) is closed. Is adjusted.

  When the lift member (6) rotates around the hinge pin (8) together with the support member (5) when opening and closing the original cover (3), the rotary contact member (27) Since the rear end side of the lift member (6) is supported behind the hinge pin (8), the rear end side of the lift member (6) is a rotating contact member (see FIG. 4B). Move while abutting on 27). At this time, since the rotary contact member (27) freely rotates at the upper end of the elevating member (26), sliding friction is generated between the rotary contact member (27) and the lower surface of the lift member (6). The original cover (3) can be smoothly opened and closed through the lift member (6) and the like. Moreover, since the contact between the lower surface of the lift member (6) and the rotary contact member (27) is prevented from being worn, the frequency of readjustment by the posture adjusting means (23) is greatly increased. The maintenance can be simplified.

  The document crimping plate opening / closing device described in the above embodiment is exemplified to embody the technical idea of the present invention, and the material, shape, structure, etc. of each member are those of these embodiments. Further, the shape, structure, type, and the like of the apparatus main body and the original pressure plate are not limited to those of the above embodiment, and various modifications can be made within the scope of the claims of the present invention. It can be added.

  For example, in the above-described embodiment, the first cam surface formed on the horizontal movement member and the second cam surface formed on the lifting member constitute the push-up cam surface. It is only necessary to convert the movement into the vertical movement of the elevating member, and the cam surface may be formed only on one side, or the cam surface may be formed as a concave curved surface. Further, in the above embodiment, the push-up cam surface is formed on the back-lowering inclined surface, and the elevating member is raised by the retreat of the horizontal movement member, but this cam surface is formed on the front-lowering inclined surface, You may comprise so that a raising / lowering member may be raised by advance of a horizontal movement member. Further, the linkage between the horizontal movement member and the elevating member can be configured other than the cam surface.

  In the above embodiment, the adjustment operation member protrudes rearward from the rear wall of the mounting member. However, the adjustment operation member only needs to be able to move the lifting member up and down via the horizontal movement member, and the other side such as the side of the mounting member. It is also possible to project in the direction. Further, the rotary contact member may be formed in a shape other than a roller shape such as a spherical shape, and a bearing may be used. Furthermore, it is possible to arrange this rotary contact member in front of the hinge pin, and it goes without saying that this rotary contact member and other members may be formed of a metal material having high strength.

  The document crimping plate opening / closing device of the present invention reduces the frictional force at the contact portion between the tip of the elevating member and the lift member, prevents the occurrence of a gap when the document crimping plate is closed, and is adjusted by the posture adjusting means. The height of the lifted rear end of the lifted member can be maintained for a long period of time, reducing the need for readjustment by the attitude adjustment means. The image forming apparatus is suitably used.

1 is a cross-sectional view of a document crimping plate opening / closing device according to a first embodiment of the present invention, showing a state where a document crimping plate is closed. FIG. FIG. 3 is a cross-sectional view of the document crimping plate opening / closing device showing a usage example when the document is thick according to the first embodiment. It is a partially broken perspective view of the attachment member incorporating the posture adjusting means of the first embodiment. FIG. 4A shows the operation of the rotary contact member of the first embodiment, FIG. 4A is an enlarged sectional view in the vicinity of the rotary contact member for explaining the adjustment of the height position of the lift member, and FIG. It is an expanded sectional view near a rotation contact member explaining opening and closing operation. It is a figure equivalent to FIG. 1 which shows a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Original pressure plate opening / closing device 2 ... Main body 3 ... Original pressure plate 4 ... Mounting member 5 ... Support member 6 ... Lifting member 8 ... Hinge pin 9 ... Support pin
17 ... Biasing spring
23 ... Attitude adjustment means
24 ... Adjustment operation member
25… Horizontal moving member
26 ... Lifting member
27… Rotating contact member
28 ... Push-up cam surface

Claims (5)

An attachment member (4) attached to the apparatus main body (2) side, and a support member (5) having a rear end connected to the attachment member (4) via a hinge pin (8) so as to be rotatable in the vertical direction; A lift member (6) which is connected to the front end portion of the support member (5) via a support pin (9) so as to be rotatable in the vertical direction and attached to the original cover (3).
An urging spring (17) is arranged on the support member (5), and the lift member (6) is urged in an overlapping direction with the support member (5) by the elastic force of the urging spring (17). ,
A document crimping plate opening / closing device provided with posture adjusting means (23) for adjusting the height position of the rear end side of the lift member (6) between the mounting member (4) and the lift member (6). Because
The posture adjusting means (23) includes an elevating member (26) that moves up and down along the mounting member (4), and an adjusting operation member (24) that adjusts the vertical position of the elevating member (26). Prepared,
A rotary contact member (27) is rotatably arranged at the upper end of the lifting member (26), and the rotary contact member (27) is applied to the rear end side of the lift member (6) from below. A document crimping plate opening and closing device, characterized in that it can be contacted.   The posture adjusting means (23) further includes a horizontal moving member (25) supported by the mounting member (4) so as to be movable in the horizontal direction, and the adjusting operation member (24) is the horizontal moving member. 2. The document crimping plate opening / closing device according to claim 1, wherein the vertical position of the elevating member (26) can be adjusted via (25).   A push-up cam surface (28) for pushing up the elevating member (26) by the horizontal movement of the horizontal moving member (25) is provided at least at one part where the horizontal moving member (25) and the elevating member (26) contact each other. The document crimping plate opening / closing device according to claim 2, which is formed.   4. The document pressing plate opening / closing apparatus according to claim 1, wherein the elevating member (26) is disposed rearward of the hinge pin (8).   5. The original cover pressing device according to claim 1, wherein the elevating member (26) is made of synthetic resin.

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