JP2006017855A - Original press-cover opening/closing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stop and hold an original press-cover at an opening angle at a middle position and moreover, to prevent a mount leg part from being sprung up, even if the mount leg part comes off from the mount hole of a device body. <P>SOLUTION: The original press-cover opening/closing device is equipped with a mounting member (2), a support member (3) and a hinge pin (4). The mounting member (2) is equipped with the mounting leg part (5) and a cam member (11) around the hinge pin (4). The support member (3) is equipped with a slider (12) and an energizing spring (13), and the slider (12) is equipped with an abutting part (15) sliding on a cam surface (14). A step part (16) is formed at the middle part of the cam surface (14). Rotational force, required when the abutting part (15) moves from the step part (16) to a closing side against the elastic force of the energizing spring (13), is set stronger than the rotational force in a closing direction by the gravity of the original cover (8) at this time. The cam surface (14) other than the step part (16) is formed in cam shape that a normal at an abutting point on the abutting part (15) passes through the hinge pin (4). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document crimping plate opening / closing device used for crimping a document by a copying machine, a printing machine, a scanner, etc. More specifically, the document crimping plate can be held by being stopped at an opening angle at an intermediate position. However, the present invention relates to a manuscript crimping plate opening / closing device that prevents the leg from repelling even if the mounting leg portion comes out of the mounting hole of the apparatus main body.

  2. Description of the Related Art Conventionally, in this type of document crimping plate opening / closing device, for example, as shown in FIGS. (54) and a hinge pin (55) that rotatably connects the support member (54) to the mounting member (52) (see Patent Document 1).

  As shown in FIG. 5, the mounting member (52) includes a mounting leg (57) that is removably inserted into a mounting hole (56) formed in the apparatus main body (51). In some cases, a thick original (59) may be placed on the original table (58) of the apparatus main body (51). In this case, the original pressure plate (53) is substantially parallel to the original table (58). The mounting leg (57) is moved up and down in the mounting hole (56) so as to be in a closed posture, and the position of the hinge pin (55), which is the rotation center of the original pressure plate (53), is determined. ) Can be moved up and down.

  A cam member (60) is fixed to the mounting member (52) around the hinge pin (55). The support member (54) is provided with a slider (61) and a biasing spring (62) for biasing the slider (61) toward the cam member (60). The slider (61) includes a contact portion (64) that slides on the cam surface (63) of the cam member (60). As shown in FIG. 6, the cam surface (63) is perpendicular to the tangent at the point where the abutting portion (64) abuts when the original pressing plate (53) is opened at a predetermined angle (α). The normal line (65) is formed in a cam shape deviated from the hinge pin (55) which is the center of rotation. For this reason, at this opening angle (α), a hinge torque in the direction of opening the document pressing plate (53) is generated by the elastic force of the biasing spring (62). As a result, the document pressing plate (53) has an intermediate position opening in which the rotational force (F) in the closing direction due to its own weight balances the hinge torque in the opening direction due to the elastic force of the biasing spring (62). Stopped and held at an angle.

Japanese Utility Model Publication 4-28094

  The mounting leg (57) can be inserted into and removed from the mounting hole (56) and can be moved up and down in the mounting hole (56). You may get out of your way. At this time, if the hinge torque is generated by the biasing spring (62), the mounting leg (57) that has come out of the mounting hole (56) loses the support force by the main body (51) and repels rapidly. There is a risk that it may go up and collide with other objects or be damaged by the impact.

  The technical problem of the present invention is that the above-mentioned problems can be solved and the original cover can be held at an intermediate opening angle, and it can be repelled even if the mounting leg part comes out of the mounting hole of the apparatus body. An object of the present invention is to provide a manuscript crimping plate opening / closing device that does not rise.

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 manuscript crimping plate opening / closing device, an attachment member (2) attached to the apparatus main body (6), a supporting member (3) holding the manuscript crimping plate (8), and the supporting member (3). A hinge pin (4) rotatably connected to the mounting member (2), and the mounting member (2) is mounted to be removably inserted into a mounting hole (7) formed in the apparatus body (6). A leg member (5) is provided, a cam member (11) is provided around the hinge pin (4) of one of the mounting member (2) and the support member (3), and a slider (12) is provided on the other side. And an urging spring (13) for urging the slider (12) toward the cam member (11), and the slider (12) is a cam surface (14) of the cam member (11). ) Is provided with an abutting portion (15) that slides, and at least one step portion (16) is formed at an intermediate portion of the cam surface (14) to Joint (15) The rotational force required to move from the step (16) to the closing side against the elastic force of the biasing spring (13) is closed by the weight of the original cover (8). The cam surface (14) other than the stepped portion (16) is set to a normal line (19) at the contact point with the contact portion (15). It is formed in a cam shape that passes through the hinge pin (4).

  The rotational force required for the contact portion to overcome this step portion against the elastic force of the biasing spring and move to the closing side is set to be larger than the rotational force in the closing direction due to the weight of the original pressure plate. Therefore, the abutting portion that slides in the closing direction on the cam surface when the document pressing plate is closed is received by the stepped portion and stops moving. On the other hand, the cam surface other than the stepped portion has a cam shape in which the normal line at the point where the abutting portion abuts passes through the hinge pin serving as the rotation center of the support member. Rotational force (so-called hinge torque) for rotating the original document pressing plate in the opening direction is not generated.

  The above-mentioned stepped portion is not particularly limited as long as it can hold the original cover by stopping at the opening angle of the intermediate position, and can be formed at any position on the cam surface. However, the formation position is preferably received in a state where the document is opened to the extent that it can be manipulated. Usually, the opening angle of the document pressing plate with respect to the apparatus main body is within a range of 10 to 70 degrees, and more preferably 30 to 60. Within the range of degrees, and more preferably within the range of 40 to 50 degrees, it is formed on the cam surface at the position where the abutting part abuts.

  When the second step portion closer to the hinge pin than the other cam surface is formed at a position where the contact portion comes into contact when the original document crimping plate is switched to the fully open position, the contact portion is moved to this position. It is preferable because it is easy to recognize that the original cover has been switched to the fully open position with the feeling of being fitted in the second step portion, and the original cover can be easily held in this fully open position.

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

  (1) Since the contact portion is received by the above-mentioned step portion when sliding on the cam surface in the closing direction, the original pressing plate is stopped at an opening angle at an intermediate position corresponding to this step portion. Can be held.

  (2) Moreover, since the elastic force of the urging spring that urges the slider toward the cam surface other than the stepped portion does not generate a hinge torque for opening and closing the original pressure plate, the mounting leg portion is temporarily Even if it comes out of the mounting hole of the apparatus main body, it does not repel, and collision with other objects due to this repelling can be prevented.

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 partially cutaway 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 cross-sectional view of the original pressure plate opening / closing apparatus showing a state in which the original pressure plate is stopped at the opening angle at the intermediate position, and FIG. 4 is an enlarged view of the vicinity of the cam member. It is sectional drawing.

As shown in FIG. 1, the document pressure plate opening / closing device (1) has an attachment member (2), a support member (3), and the support member (3) can be rotated to the attachment member (2). Hinge pin (4) connected to
The mounting member (2) includes a mounting leg (5). The mounting leg (5) is removably inserted into a mounting hole (7) formed in an apparatus body (6) such as a copying machine. Is done. On the other hand, the support member (3) is fixed to the original pressure plate (8), and is rotated about the hinge pin (4) so that the original pressure plate (8) is attached to the main body (6). The document table (9) is opened and closed.

  As shown in FIG. 2, when the thick original (10) is placed on the original table (9), the mounting leg (5) moves up and down in the mounting hole (7). The hinge pin (4), which is the center of rotation of the original cover (8), moves up and down relative to the apparatus body (6). As a result, the original pressure plate (8) is substantially parallel to the thick original (10) on the original table (9), and the thick original (10) can be covered in a substantially pressed state.

  As shown in FIGS. 1 and 2, the mounting member (3) is integrally provided with a cam member (11) above the mounting leg (5). The hinge pin (4) penetrates the cam member (11) and is inserted into one end side of the support member (3), whereby the support member ( 3) is rotatably connected to the mounting member (2).

  On the other hand, a slider (12) and an urging spring (13) that can advance and retreat along the inner surface of the support member (3) are arranged inside the support member (3). The slider (12) Is urged against the cam member (11) by the urging force of the urging spring (13). The slider (12) is integrally formed with a contact portion (15) that slides in contact with the cam surface (14) of the cam member (11).

  As shown in FIG. 3, when the opening angle (α) of the original cover (8) with respect to the intermediate portion of the cam surface (14), specifically, the original table (9), is about 45 degrees. A step portion (16) is formed at a position where the contact portion (15) contacts. In this embodiment, the step portion (16) is formed at a position corresponding to an opening angle (α) of 45 degrees, but in the present invention, it is 10 to 70 degrees, preferably 30 to 60 degrees, and more preferably 40 to 50 degrees. This step (16) can be formed at any position within the range of degrees.

  The step (16) is the rotation required when the contact portion (15) moves from the step (16) to the closing side against the elastic force of the biasing spring (13). The height is slightly larger than the rotational force (F) in the closing direction due to the weight of the original pressure plate (8) at this time, so that the height is the elastic pressure of the biasing spring (13) and the original pressure plate ( It is set considering the weight of 8). For this reason, when the document pressing plate (8) is closed, the contact portion (15) that slides and moves on the cam surface (14) in the closing direction reaches the step portion (16). ) To stop the sliding movement. When the operator rotates the document crimping plate (8) in the closing direction, the contact portion (15) is stepped by the rotational force and the rotational force (F) due to the weight of the document crimping plate (8). From the section (16), it easily rides on the cam surface (14) on the closing side, whereby the original cover (8) is easily closed.

As shown by the phantom line in FIG. 3, the contact surface (15) contacts the cam surface (14) when the original cover (8) is switched to the fully open position (O). In addition, a second step portion (18) closer to the hinge pin (4) than the other cam surface (14) is formed. When the operator fully opens the document crimping plate (8), the contact portion (15) is fitted into the second step portion (18), and the document crimping plate (8) is fully opened (O) by the touch. It can be easily recognized that it has been switched to.
The contact portion (15) fitted in the second step portion (18) is camped against the elastic force of the biasing spring (13) when moving to the closing side. Therefore, the original cover (8) is easily held in this fully open position (O) until the operator rotates it in the closing direction.

  As shown in FIG. 4, the cam surface (14) other than the stepped portion (16) and the second stepped portion (18) is at the contact point with the contacted portion (15) at any position. The normal line (19) is formed in a cam shape that passes through the hinge pin (4), which is the rotation center of the support member (3). For this reason, the pressing force by the biasing spring (13) does not generate a hinge torque that rotates the support member (3) in the opening direction with respect to the mounting member (2). Accordingly, even if the mounting leg portion (5) of the mounting member (2) comes out of the mounting hole (7) of the apparatus main body (6), the mounting leg (5) is compressed by the elastic force of the biasing spring (13). The part (5) does not repel.

  In addition, since the hinge torque for rotating the document pressing plate (8) to the opening side due to the elastic force of the biasing spring (13) is not generated, the document is placed on the document table (9) of the apparatus body (6). When the pressure-bonding plate (8) is closed, the original pressure-bonding plate (8) is securely held in the closed position by the rotational force in the closing direction due to its own weight.

  The document crimping plate opening and closing device described in the above embodiment is illustrated to embody the technical idea of the present invention, and the material, shape, structure, etc. of each member are the same as those in this embodiment. The present invention is not limited, and the shape, structure, type, and the like of the apparatus main body and the original pressing plate are not limited to those of the above-described embodiment, and various modifications are made within the scope of the claims of the present invention. To get.

For example, in the above embodiment, the cam member is formed on the mounting member, and the slider and the biasing spring are provided on the support member. However, in the present invention, the cam member is provided on the support member, and the slider and the biasing spring are provided on the mounting member. May be provided. Further, the cam member only needs to be fixed to an attachment member or the like, and is not necessarily formed integrally.
Furthermore, in the above embodiment, one step portion is formed at the intermediate portion of the cam surface. However, in the present invention, a plurality of step portions can be formed.

  Since the document crimping plate opening and closing device of the present invention can hold the document crimping plate by stopping at the opening angle of the intermediate position, it does not repel even if the mounting leg part comes out of the mounting hole of the apparatus body. In particular, it is suitably used for various image forming apparatuses, as well as copying machines, printing machines, scanners, etc., which handle thick originals.

FIG. 3 is a partially cutaway view of the document crimping plate opening / closing apparatus showing the embodiment of the present invention and showing a state in which the document crimping plate is closed. FIG. 4 is a partially cutaway view of the document crimping plate opening / closing device showing the embodiment of the present invention and showing an example of use when the document is thick. FIG. 3 is a cross-sectional view of the document crimping plate opening / closing device according to the embodiment of the present invention, showing a state in which the document crimping plate is stopped at an opening angle at an intermediate position. It is an expanded sectional view near a cam member showing an embodiment of the present invention. FIG. 3 is a view corresponding to FIG. FIG. 4 is a view corresponding to FIG. 3 showing a conventional technique.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Document crimping plate opening / closing device 2 ... Mounting member 3 ... Supporting member 4 ... Hinge pin 5 ... Mounting leg 6 ... Apparatus body 7 ... Mounting hole 8 ... Document crimping plate
11 ... Cam member
12 ... Slider
13 ... Biasing spring
14 ... Cam surface
15 ... Contact part
16 ... Step
18 ... Second stage
19: Normal at the contact point F: Rotational force in the closing direction due to the weight of the original pressure plate (8) O: Full open position of the original pressure plate (8) α: Opening angle at an intermediate position of the original pressure plate (8)

Claims (3)

An attachment member (2) attached to the apparatus main body (6), a support member (3) for holding the original cover (8), and the support member (3) can be rotated to the attachment member (2). A hinge pin (4) to be connected,
The mounting member (2) includes a mounting leg (5) that is removably inserted into a mounting hole (7) formed in the apparatus body (6).
A cam member (11) is provided around the hinge pin (4) of either the mounting member (2) or the support member (3), and the slider (12) and the slider (12) are provided on the other side. An urging spring (13) for urging and biasing toward the cam member (11),
The slider (12) is a document crimping plate opening and closing device provided with a contact portion (15) that slides on the cam surface (14) of the cam member (11),
Forming at least one step (16) in the middle of the cam surface (14);
The rotational force required when the contact portion (15) moves from the step portion (16) to the closing side against the elastic force of the biasing spring (13), Set larger than the rotational force (F) in the closing direction due to the weight of the pressure plate (8),
The cam surface (14) other than the step portion (16) is formed in a cam shape in which the normal line (19) at the contact point with the contact portion (15) passes through the hinge pin (4). A document crimping plate opening and closing device.   The contact portion (15) contacts the step portion (16) when the opening angle (α) of the original cover (8) with respect to the apparatus body (6) is within a range of 10 to 70 degrees. 2. The document crimping plate opening / closing device according to claim 1, wherein the document pressing plate opening / closing device is formed on a cam surface (14) at a position.   When the original cover (8) is switched to the fully open position (O), the contact portion (15) comes closer to the hinge pin (4) than the other cam surface (14). 3. The document crimping plate opening / closing device according to claim 1, wherein a second step portion (18) is formed.

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