JP2023019067A - Hinge and office machine - Google Patents

Abstract

To provide a hinge which can set a more proper torque curve through an entire opening/closing angular range of an opening/closing body with the increased independence and degree of freedom for setting of the torque curve within a second opening/closing angular range.SOLUTION: A hinge comprises: an attachment member which has a case part whose upper part is opened and is attached a device body side; a support member which is provided via a hinge shaft in the attachment member in a rotatable manner and supports an opening/closing body; a slider which slides in the vertical direction in the case part; and a compression coil spring which is elastically provided between the slider and the attachment member. The support member has a first operation cam part and a second operation cam part which protrude toward the case part and are in parallel to each other. The slider comprises: a first pressure reception cam part which is brought into pressure-contact with the first operation cam part; and a second pressure reception cam part which is brought into pressure-contact with the second operation cam part. The first operation cam part and the first pressure reception cam part form a first torque curve within a first opening/closing angular range of the attachment member and the support member. The second operation cam part and the second pressure reception cam part form a second torque curve within a second opening/closing angular range of the attachment member and the support member.SELECTED DRAWING: Figure 3

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hinge suitable for connecting an opening/closing body to a main body of office equipment so that it can be opened and closed.

2. Description of the Related Art Conventionally, most office equipment used in offices, such as copiers, multi-function machines, facsimiles, scanners, and printers, is provided with a document table provided with a contact glass on the upper surface of the device body. It has a document pressing plate that covers the top so that it can be opened and closed. The document pressing plate brings the document placed on the document table into close contact with the document table, thereby preventing external light from affecting the exposure system in the main body of the apparatus through the contact glass. Various types of hinges are known for attaching such a document pressing plate to the main body of the apparatus so that it can be opened and closed.

The hinge described in Patent Document 1 is a hinge that connects an opening/closing body to an apparatus main body so that it can be opened and closed. A support member provided rotatably on a mounting member via a hinge shaft to support the opening/closing body, a slider that slides vertically within the case, and a compression coil resiliently installed between the slider and the mounting member. a spring; The mounting member has an operating cam portion projecting toward the case portion, the slider has a pressure-receiving cam portion that presses against the operating cam portion, and the operating cam portion and the pressure-receiving cam portion A torque curve is formed by pressing the opening/closing body over the entire opening/closing angle range.

JP 2009-71804 A

In the torque curve of the hinge shown in FIG. 16 of Patent Document 1, the opening/closing body is pressed against the apparatus main body in the opening/closing angle range of 0° to 15° on the closing side, while opening/closing at 15° to 70° on the opening side. It is described that in the angular range a so-called free stop is achieved which maintains the opening/closing body in the current open position.

For this reason, the hinge of Patent Document 1 forms a supporting torque larger than the weight moment of the opening and closing body in the opening/closing angle range of 17° to 70° on the open side of the support member. The actuating cam portion and the pressure receiving cam portion are designed to generate a supporting torque smaller than the moment of weight of the opening/closing body within the opening/closing angle range of 17°.

However, it is difficult to set a proper torque curve over the entire opening/closing angle range of the opening/closing member with only one pair of the operating cam portion and the pressure receiving cam portion. If a proper torque curve is set through the first opening/closing angle range on the opening side, it is difficult to set a proper torque curve in the second opening/closing angle range on the closing side that is continuous with the first opening/closing angle range. For example, if the free stop is set in the first opening/closing angle range of 60° to 20°, the falling speed of the opening/closing body becomes excessive in the second opening/closing angle range of 20° to 0°, and the collision with the main body of the device causes impact. may be targeted.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a hinge that increases the independence and degree of freedom in setting the torque curve in the second opening/closing angle range and allows setting of a more appropriate torque curve over the entire opening/closing angle range of the opening/closing member. be.

In order to solve the above-mentioned problems, the hinge of the present invention according to claim 1 is a hinge for connecting an opening/closing body to an apparatus main body so as to be able to open and close, the hinge having a case part with an open top, A mounting member attached to the main body of the device, a supporting member rotatably provided on the mounting member via a hinge shaft and supporting the opening/closing body, a slider sliding vertically in the case, and the slider. a compression coil spring elastically provided between the mounting members, the supporting member having a first operating cam portion and a second operating cam portion protruding toward the case portion and parallel to each other; The slider has a first pressure-receiving cam portion that presses against the first operating cam portion and a second pressure-receiving cam portion that presses against the second operating cam portion, and the first operating cam portion and the first pressure-receiving cam portion The cam portion forms a first torque curve in a first opening/closing angle range of the mounting member and the supporting member, and the second operating cam portion and the second pressure receiving cam portion are configured to move the mounting member and the supporting member to the first opening angle range. The second torque curve is formed in two opening/closing angle ranges.

The hinge according to claim 2 is characterized in that the first operating cam portion and the first pressure receiving cam portion are spaced apart within the second opening/closing angle range.

Further, in the hinge according to claim 3, the second operating cam portion and the second pressure receiving cam portion are spaced apart within the first opening/closing angle range.

In the hinge according to claim 4, the first operating cam portion and the first pressure-receiving cam portion have a first supporting torque larger than the moment of weight of the opening/closing body within the first opening/closing angle range. The second operating cam portion and the second pressure-receiving cam portion generate a second peak of support torque smaller than the moment of weight of the opening/closing body continuous with the first peak in the second opening/closing angle range. characterized by forming

Further, in the hinge according to claim 5, the second operating cam portion is provided so as to protrude further outward than the first operating cam portion in a diametrical direction of the support member centered on the hinge shaft. It is characterized by being

Further, in the hinge according to claim 6, the second operating cam portion pushes down the slider as the support member rotates toward 0 degrees in the second opening/closing angle range, thereby opening the compression coil spring. and a slip surface for reducing the compression of the compression coil spring by causing the second operating cam portion and the second pressure receiving cam portion to slip following the lift surface. and

In the hinge according to claim 7, the second pressure-receiving cam portion has a vertical pressure-receiving slip surface facing the hinge shaft, and the slip surface of the second operating cam portion is 2. In the second opening/closing angle range, as the support member rotates toward 0 degrees, the slip surface faces the pressure-receiving slip surface and starts slipping.

Further, the office equipment according to claim 8 is characterized in that the hinge according to each of claims 1 to 7 is provided between the main body of the apparatus and the document pressing plate.

In the hinge according to claim 1, the first operating cam portion and the first pressure-receiving cam portion are pressed against each other in a first opening/closing angle range equal to or larger than a predetermined opening/closing angle to form the first torque curve, while the second operating cam portion and the second pressure-receiving cam portion are in pressure contact in a second opening/closing angle range that is less than the predetermined opening/closing angle and is continuous with the first opening/closing angle range, thereby forming a second torque curve with a smaller torque than the first torque curve. Therefore, by adjusting the second operating cam portion and the second pressure receiving cam portion, various second torque curves can be set without affecting the first torque curve. Therefore, it is possible to provide a hinge capable of setting a more appropriate torque curve over the entire opening/closing angle range of the opening/closing member by ensuring the independence and flexibility of setting the torque curve in the second opening/closing angle range. Here, the first opening angle range may be an angle range on the opening side equal to or greater than the predetermined opening angle, and the second opening angle range may be an angle on the closing side adjacent to the first opening angle range less than the predetermined opening angle. It can be a range. As will be described later, it is possible to quickly switch the torque curve between the continuous first opening/closing angle range and the second opening/closing angle range. In addition, in the application of office equipment, the opening/closing member presses the main body of the device on the closed side of 0°, so the torque of the second torque curve is smaller than that of the first torque curve.

In the hinge according to claim 2, the first operating cam portion and the first pressure receiving cam portion are separated from each other within the second opening/closing angle range in which the second operating cam portion and the second pressure receiving cam portion are in pressure contact. Therefore, the second torque curve can be set by adjusting the second operating cam portion and the second pressure receiving cam portion without being affected by the first operating cam portion and the first pressure receiving cam portion.

In the hinge according to claim 3, the second operating cam portion and the second pressure receiving cam portion are separated from each other within the first opening/closing angle range in which the first operating cam portion and the first pressure receiving cam portion are in pressure contact. Therefore, the first torque curve can be set by adjusting the first operating cam portion and the first pressure receiving cam portion without being affected by the second operating cam portion and the second pressure receiving cam portion.

In the hinge according to claim 4, the free stop of the opening/closing body can be set using the first peak of the supporting torque larger than the moment of weight of the opening/closing body in the first opening/closing angle range. By using the second peak of the supporting torque smaller than the moment of weight of the opening/closing body in the second opening/closing angle range, the combination of the deceleration pattern of the opening/closing body and the pressing force can be set in a wide range.

In the hinge according to claim 5, the first operating cam portion and the second operating cam portion can be realized with a simple structure of the diametrical difference formed in the support member.

In the hinge according to claim 6, since the compression of the compression coil spring is rapidly reduced by the slip of the slip surface, the second torque curve in the second opening/closing angle range can form a sudden drop pattern of the support torque.

In the hinge according to claim 7, the sudden drop pattern of the support torque of the second torque curve is formed at the rotation angle of the support member at which the pressure receiving slip surface of the second pressure receiving cam portion and the slip surface of the second operating cam portion face each other. can do.

In the business machine according to claim 8, the independence and degree of freedom of setting the torque curve for the second opening/closing angle range of the opening/closing body are ensured, and a more appropriate torque curve can be set over the entire opening/closing angle range of the opening/closing body. Office equipment can be provided.

1 is a front view of a copier, which is an example of office equipment using a hinge according to the present invention; FIG. It is a perspective view of the external appearance of a hinge, (a) is an open state, (b) is a closed state. FIG. 4 is an exploded perspective view of the hinge for explaining the structure of the hinge; FIG. 4 is an explanatory diagram of the configuration of the mounting member, where (a) is a plan view and (b) is a cross-sectional view taken along line EE. FIG. 4 is an explanatory diagram of the structure of the support member, in which (a) is a bottom view, (b) is a DD cross-sectional view, and (c) is a CC cross-sectional view. FIG. 4 is an explanatory diagram of the structure of the slider, where (a) is a plan view, (b) is a sectional view taken along line AA, and (c) is a sectional view taken along line BB. FIG. 10 is an explanatory diagram of the hinge in the closed state of the document pressing plate; FIG. 10 is an explanatory diagram of the relationship between the supporting torque of the document pressure plate and the moment of weight of the document pressure plate, which generates a hinge toward 0 degrees on the closing side of the supporting member; FIG. 10 is an explanatory view of the 60-degree state of the hinge toward 0 degree in the first opening/closing angle range, where (a) is a cross-sectional view of the first operating cam portion and (b) is a cross-sectional view of the second operating cam portion; FIG. 10 is an explanatory view of the 20-degree state of the hinge toward 0 degree in the first opening/closing angle range, where (a) is a cross-sectional view of the first operating cam portion and (b) is a cross-sectional view of the second operating cam portion; FIG. 4 is an explanatory view of a hinge that switches from a first opening/closing angle range to a second opening/closing angle range; FIG. 10A is a cross-sectional view of the first operating cam portion, and FIG. 9B is a cross-sectional view of the second operating cam portion; FIG. FIG. 10A is a cross-sectional view of the first operating cam portion, and FIG. 9B is a cross-sectional view of the second operating cam portion; FIG.

As an example of a hinge according to the present invention and office equipment using this hinge, an embodiment of a copying machine will be described in detail below with reference to the accompanying drawings. As shown in FIG. 1, a copier 1 has a hinge 10, which is an example of an embodiment of the present invention, between a device main body 2 and an original pressing plate 3. As shown in FIG. The copying machine 1 has an apparatus main body 2 provided with a contact glass 2a, and an original pressing plate 3, which is an example of an opening/closing body attached to the apparatus main body 2 via a hinge 10 so as to be openable and closable. The copying machine 1 normally has a pair of left and right hinges 10, but since both hinges have the same structure, one of them will be explained here.

A female screw hole 5 e for attaching the case portion 5 a to the apparatus main body 2 is provided at the rear lower end portion of the case portion 5 a of the mounting member 5 . The hinge 10 is a mounting screw that is inserted from above into an insertion hole 2b provided downward in the rear end portion of the main body 2 of the copier 1 in the case portion 5a of the mounting member 5, and screwed in from the side of the main body 2 of the copying machine. It adheres to the insertion hole 2b by screwing 5f into the female screw hole 5e. At this point, the case portion 5a may be simply inserted and fixed into the insertion hole 2b.

As shown in FIGS. 2 and 3, the hinge 10 connects the document pressing plate 3 to the apparatus main body 2 so as to be openable and closable. a mounting member 5 attached to the side, a supporting member 7 rotatably provided on the mounting member 5 via a hinge shaft 6 and supporting the document pressing plate 3, and a slider 8 sliding vertically within the case portion 5a. , and a compression coil spring 11 resiliently installed between the slider 8 and the mounting member 5 .

The hinge shaft 6 passes through the mounting holes 6a, 6a of the mounting member 5 and the through hole 6e of the supporting member 7 from the head 6d side, and the ring member 6c is fitted into the ring groove 6b to prevent it from falling off. A hollow slider 8 having a planar square shape is accommodated in the case portion 5a so as to be vertically slidable. The slider 8 has a vertical guide groove 8j, and the guide groove 8j is guided by the guide protrusion 5j of the case portion 5a shown in FIG. The lower side of the compression coil spring 11 is pressed against the bottom plate portion 5g of the case portion 5a by inserting the guide projection portion 5h of the case portion 5a. The upper side of the compression coil spring 11 is inserted into the slider main body 8a of the slider 8 shown in FIG. 6 and pressed against the abutting portion 8d.

The mounting member 5 is, in the embodiment, a molded resin product such as POM having high mechanical strength. A pair of mounting pieces 5b, 5b protruding upward from the case portion 5a at a predetermined interval, and a stopper portion 5d horizontally provided at the upper end of the rear plate portion 5c of the case portion 5a between the mounting pieces 5b, 5b. , a stopper portion 5i provided on the opposite side of the stopper portion 5d continuously to the attachment piece portions 5b, 5b, a female screw hole 5e provided in the lower end portion of the rear plate portion 5c in the front-rear direction, and a bottom plate portion 5g. and a guide protrusion 5h provided upward.

The support member 7 in the embodiment is a resin molded product such as POM having high mechanical strength, and includes a connecting portion 7a inserted between the mounting pieces 5b of the mounting member 5 and a connecting portion A mounting piece 7b provided with a mounting hole 7c protruding left and right from 7a, a beam-shaped support portion 7d provided forward from the connecting portion 7a, and a support portion 7d protruding toward the slider 8. and an actuating cam portion 7e. The operating cam portion 7 e rotates integrally with the support member 7 around the hinge shaft 6 . As shown in FIG. 3, the support member 7 is rotatably attached to the attachment pieces 5b, 5b of the attachment member 5 via the hinge shaft 6 at the connecting portion 7a.

The slider 8 has a pressure-receiving cam portion 8e protruding upward at a position shifted forward from the center of the top portion of the outer side thereof. As shown in FIGS. 9 to 13, as the support member 7 rotates about the hinge shaft 6, the operating cam portion 7e rotates while being pressed against the pressure receiving cam portion 8e, and is supported by the compression coil spring 11. slide the slider 8 vertically. At the closing angle of 0 degree shown in FIG. 13, the stopper portion 5i is brought into contact with the mounting piece 7b of the support member 7 to restrict the closing angle. At the opening angle of 60 degrees shown in FIG. 9, the opening angle is regulated by bringing the stopper portion 5d into contact with the end face 7i of the support member 7. As shown in FIG.

As shown in FIG. 7, in the closed state of the document pressing plate 3, the document pressing plate 3 covers the upper surface of the contact glass 2a. At this time, as shown in FIG. 8, the moment of weight of the document pressure plate 3 is greater than the supporting torque generated around the hinge shaft 6 by the compression coil spring 11 via the slider 8. maintains its closed state against the supporting torque.

After that, an operator who performs copying puts a finger on one end of the front side of the document pressing plate 3 and lifts it up in order to set the document on the contact glass 2a. Then, at first, the weight of the document pressing plate 3 is felt, but the support torque of the compression coil spring 11 overcomes in the middle, and the pressure receiving cam portion 8e of the slider 8 pushes the operating cam portion 7e of the support member 7 upward. . Therefore, as shown in FIG. 1, the document pressing plate 3 is opened by rotating the support member 7 counterclockwise with the hinge shaft 6 as a fulcrum without feeling the original weight of the plate.

Subsequently, after the operator sets the document on the contact glass 2a, the document pressing plate 3 is pushed downward in the closing direction. Then, the support member 7 rotates counterclockwise around the hinge shaft 6 , and the operating cam portion 7 e of the support member 7 pushes down the pressure receiving cam portion 8 e of the slider 8 against the elastic force of the compression coil spring 11 . As a result, the document pressing plate 3 is closed without suddenly dropping, and the document is brought into close contact with the contact glass 2a.

By the way, in the hinge 10 of the first embodiment, by adding the following configuration, it is possible to operate as if an oil damper is installed in the angle range of 8 degrees to 0 degrees of the document pressing plate 3. are doing.

First, the mounting member 5 has a first operating cam portion C1 and a second operating cam portion C2 that protrude toward the case portion 5a and are parallel to each other. It has a cam portion D1 and a second pressure receiving cam portion D2 that presses against the second operating cam portion C2. The first operating cam portion C1 and the first pressure-receiving cam portion D1 are in pressure contact within a first opening/closing angle range E1 equal to or larger than the predetermined opening/closing angle of the document pressing plate 3 to form a first torque curve F1, and the second operating cam portion The portion C2 and the second pressure-receiving cam portion D2 are in pressure contact in a second opening/closing angle range E2 which is less than a predetermined opening/closing angle and which is continuous with the first opening/closing angle range E1, and a second torque curve F2 having a smaller torque than the first torque curve F1. to form Therefore, by changing the design of the second operating cam portion C2 and the second pressure receiving cam portion D2, various second torque curves F2 can be set without affecting the first torque curve F1. By ensuring the independence and flexibility of setting the torque curve for the second opening/closing angle range E2, a more appropriate torque curve can be set over the entire opening/closing angle range of the document pressing plate 3. FIG.

That is, the first operating cam portion C1 and the first pressure receiving cam portion D1 are spaced apart within the second opening/closing angle range E2, and the second operating cam portion C1 and the second pressure receiving cam portion D2 are spaced apart within the first opening/closing angle range E1. separated by Therefore, the second torque curve F2 in the second opening/closing angle range E2 is not affected by the first operating cam portion C1 and the first pressure receiving cam portion D1. The first operating cam portion C1 and the second operating cam portion C2 provided in parallel allow the slider 8 to slide without being affected by each other. As shown in FIG. 8, between the first opening/closing angle range E1 and the second opening/closing angle range E2, the driving of the first operating cam portion C1 and the second operating cam portion C2 is instantaneously switched to allow the slider to operate within a narrow angle range. It is possible to greatly change the sliding direction and amount of sliding.

The first operating cam portion C1 and the first pressure-receiving cam portion D1 form a first peak P1 of supporting torque larger than the moment of weight of the document pressing plate 3 in the first opening/closing angle range E1. C2 and the second pressure-receiving cam portion D2 form a second peak P2 of support torque smaller than the moment of weight of the document pressing plate 3, which is continuous with the first peak P1 in the second opening/closing angle range E2. Therefore, in the first opening/closing angle range E1, the support torque corresponding to the weight torque of the document pressure plate 3 is set to realize the free stop of the document pressure plate 3. Various combinations of deceleration patterns and pressing forces can be set for the document pressing plate 3 by using the peak.

In addition, the second operating cam portion C2 is provided so as to protrude further outward than the first operating cam portion C1 in the diametrical direction of the support member 7 centered on the hinge shaft 6 . The first operating cam portion C<b>1 and the second operating cam portion C<b>2 are realized in a compact manner by a simple structure with a diametrical difference formed in the support member 7 .

Further, the second operating cam portion C2 includes a lift surface 7j that presses down the slider 8 and increases the compression of the compression coil spring 11 as the support member 7 rotates toward 0 degrees in the second opening/closing angle range E2, and a lift surface 7j. 7j is followed by a slip surface 7h for causing the second operating cam portion C2 and the second pressure receiving cam portion D2 to slip to reduce the compression of the compression coil spring 11. As shown in FIG. Based on such a configuration, the slip of the slip surface 7h rapidly reduces the compression of the compression coil spring 11, thereby adding a support torque rapid decrease pattern to the second torque curve F2 in the second opening/closing angle range E2. be able to.

The second pressure-receiving cam portion D2 has a vertical pressure-receiving slip surface 8h facing the hinge shaft 6 side, and the slip surface 7h of the second operating cam portion C2 is 0 degrees in the second opening/closing angle range E2. As the support member 7 rotates, it faces the pressure-receiving slip surface 8h and starts slipping. As shown in FIGS. 6A and 6B, the pressure-receiving slip surface 8h is formed by retracting a part of the pressure-receiving cam portion 8e along the moving direction R of the operating cam portion 7e toward the slider 8 side. . Based on such a configuration, the sudden drop pattern of the second torque curve F2 occurs at the rotation angle of the support member 7 at which the pressure receiving slip surface 8h of the second pressure receiving cam portion D2 and the slip surface of the second operating cam portion C2 face each other. formed. In the hinge 10, the support torque can be sharply reduced at the angular position with high reproducibility in the second opening/closing angle range E2 where the slip surface 7h faces the pressure-receiving slip surface 8h.

Further, as shown in FIG. 6(b), the pressure receiving slip surface 8h has an arcuate surface 8n on its upper portion and is connected to the top of the pressure receiving cam portion 8e via the arcuate surface 8n. Therefore, the transition from the engagement (FIG. 12) to the slip (FIG. 13) between the pressure-receiving slip surface 8h and the slip surface 7h becomes smooth, and the stress concentration and friction concentration between the pressure-receiving slip surface 8h and the slip surface 7h become smooth. is avoided.

Further, as shown in FIG. 5A, the first operating cam portion C1 and the second operating cam portion C2 are arranged symmetrically with respect to the width direction H perpendicular to the moving direction R of the operating cam portion 7e. The operating cam portion and the second operating cam portion transmit force symmetrically at positions separated in the width direction H. For this reason, tilting and twisting between the pressure-receiving cam portion 8e and the operating cam portion 7e are unlikely to occur, and the positional relationship between the pressure-receiving cam portion 8e and the operating cam portion 7e is stable. The reproducibility of the support torque accompanying the rotation of the support member 7 toward the degree is high. Further, the friction between the first operating cam portion and the second operating cam portion is dispersed, and the wear of the first operating cam portion and the second operating cam portion is suppressed.

Next, operations of the first operating cam portion C1 and the second operating cam portion C2 will be described in chronological order with reference to FIGS. 9 to 13. FIG. As shown in FIG. 9A, when the document pressing plate 3 is opened at an opening angle of 60 degrees, the end surface 7i of the support member 7 abuts against the stopper portion 5d of the mounting member 5 and stops at the opening angle of 60 degrees. . While the first operating cam portion C1 and the first pressure receiving cam portion D1 are in pressure contact at the position Q0 to push up the support member 4, as shown in FIG. It is separated from the pressure receiving cam portion D2.

As shown in FIG. 10A, even when the document pressing plate 3 is closed at an angle of 20 degrees, the first operating cam portion C1 and the first pressure-receiving cam portion D1 are pressed against each other to push up the support member 4. , as shown in FIG. 10(b), the second operating cam portion C2 and the second pressure receiving cam portion 8e are separated from each other. Therefore, the pressing position between the first operating cam portion C1 and the first pressure receiving cam portion D1 moves from the position Q0 to the position Q1 during the closing process of the document pressing plate 3 from 60 degrees to 20 degrees.

As shown in FIG. 11A, when the document pressing plate 3 is closed at an angle of 8 degrees, the first operating cam portion C1 and the first pressure-receiving cam portion D1 are in pressure contact at the position Q2, and at the same time, the second operating cam portion C2 and The second pressure receiving cam portion D2 is in pressure contact at position Q3. Immediately after that, the first operating cam portion C1 is separated from the first pressure receiving cam portion D1, and the second operating cam portion C2 continues to be in pressure contact with the second pressure receiving cam portion D2. As a result, the supporting torque decreasing process by the first operating cam portion C1 and the first pressure receiving cam portion D2 is sharply switched to the supporting torque increasing process by the second operating cam portion C2 and the second pressure receiving cam portion D2.

As shown in FIG. 12(b), when the document pressing plate 3 is closed at an angle of 4 degrees, the second operating cam portion C2 and the second pressure receiving cam portion D2 are in pressure contact at position Q4. At this time, as shown in FIG. 12(a), the first operating cam portion C1 is separated from the first pressure receiving cam portion D1.

Thereafter, when the support member 7 rotates further, the engagement between the second operating cam portion C2 and the second pressure receiving cam portion D2 at the position Q4 is released, and the slip surface 7h and the pressure receiving slip surface 8h slip while facing each other. As a result, the compression of the compression coil spring 11 is rapidly reduced, and the supporting torque of the document pressing plate 3 is rapidly reduced.

After the slipping, as shown in FIG. 13A, the stopper portion 5i of the hinge 10 is brought into contact with the attachment piece 7b of the support member 7 by the moment of weight of the document pressing plate 3, and the closing angle is set to 0°. Regulated. At this time, as shown in FIG. 13(a), the operating cam portion 7e and the pressure-receiving cam portion 8e come into contact at position Q5, and as shown in FIG. 13(b), the slip surface 7h and the pressure-receiving slip surface 8h facing each other. It should be noted that the actuating cam portion 7e of the support member 7 may be in pressure contact with the flat upper surface of the slider 8 when the hinge 10 is closed at an angle of 0°.

As described above, the hinge 10 according to the first embodiment can change the supporting torque in the opening/closing angle range of the document pressing plate 3 less than the predetermined opening/closing angle compared to the conventional simple combination of the operating cam portion and the pressure-receiving cam portion. You can increase the number of patterns. By using such a change pattern of the support torque, it is possible to set an appropriate change of the support torque through the closing process of the document pressing plate 3. FIG.

In addition, since the second peak of the support torque by the second operating cam portion C2 acts as a brake in the closing process, the speed of the document pressing plate 3 dropped from the opening/closing angle range less than the predetermined opening/closing angle is suppressed to suppress the contact glass. A collision with 2a can be avoided from being impactful.

Since the present invention is constructed as described above, it can be suitably used as a hinge for opening and closing the document pressing plate used in relatively small copiers. It can provide office equipment with good hinges.

Copiers usually have a pair of left and right hinges, and the left and right hinges may have the same structure or different structures. In the first embodiment, the copier is provided with a hinge. It is also possible to have a configuration in which a hinge is provided between the body.

Also, the support torque of the compression coil spring and the moment of weight of the document pressure plate are balanced so that the document pressure plate can stand by itself at an opening angle of about 15° with respect to the contact glass. It is also possible to set such that the rotational torque of the plate exceeds the rotational moment of the original pressing plate. In this case, even if the manuscript pressure plate is released, the manuscript pressure plate does not drop naturally and is held by itself. become.

Further, the supporting torque of the compression coil spring acting on the document pressing plate may be set so that the document pressing plate 3 is automatically pushed up to 60 degrees when the opening angle (20 degrees) of the document pressing plate is exceeded. As described above, the stopper portion 5d that contacts the support member 7 and regulates the opening angle of the support member 7 is provided on the upper surface of the case portion 5a on the side where the hinge shaft 6 is provided. The document pressing plate is automatically opened at an opening angle of 20° or more until the end face 7i of the support member 7 on the side of the connecting portion 7a comes into contact with the stopper portion 5d provided on the mounting member 5, and is opened at an opening angle of 60°. Stop.

1 copying machine 2 apparatus main body 2a contact glass 3 document pressing plate 5 mounting member 5a case portions 5b, 5b mounting piece portion 5d stopper portion 5e female screw hole 5f mounting screw 5g bottom plate portion 5h guide projection portion 5i stopper portion 5j guide projection portion 6 Hinge shaft 6a Mounting hole 6b Ring groove 6c Ring member 6d Head 6e Through hole 7 Supporting member 7a Connecting portion 7b Mounting piece 7c Mounting hole 7d Supporting portion 7e Operating cam portion 7h Slip surface 7j Lift surface 8 Slider 8a Slider main body 8d Impact Portion 8e Pressure-receiving cam portion 8h Pressure-receiving slip surface 8j Guide groove 10 Hinge 11 Compression coil spring C1 First operating cam portion C2 Second operating cam portion D1 First pressure-receiving cam portion D2 Second pressure-receiving cam portion E1 First opening/closing angle range E2 2 Opening and closing angle range F1 First torque curve F2 Second torque curve

Claims (8)

A hinge that connects the opening/closing body to the apparatus main body so as to be openable and closable,
an attachment member having a case portion with an open top and attached to the device main body;
a support member rotatably provided on the mounting member via a hinge shaft and supporting the opening and closing body;
a slider that slides vertically in the case;
a compression coil spring elastically installed between the slider and the mounting member,
The support member has a first operating cam portion and a second operating cam portion protruding toward the case portion and parallel to each other,
The slider has a first pressure-receiving cam portion that presses against the first operating cam portion and a second pressure-receiving cam portion that presses against the second operating cam portion,
the first operating cam portion and the first pressure-receiving cam portion form a first torque curve in a first opening/closing angle range of the mounting member and the support member;
The hinge, wherein the second operating cam portion and the second pressure-receiving cam portion form a second torque curve in a second opening/closing angle range of the mounting member and the supporting member. 2. The hinge according to claim 1, wherein said first operating cam portion and said first pressure receiving cam portion are spaced apart within said second opening/closing angle range. 3. The hinge according to claim 2, wherein said second operating cam portion and said second pressure receiving cam portion are spaced apart within said first opening/closing angle range. the first operating cam portion and the first pressure-receiving cam portion form a first peak of support torque greater than the moment of weight of the opening/closing body within the first opening/closing angle range;
The second operating cam portion and the second pressure-receiving cam portion form a second peak of supporting torque smaller than the moment of weight of the opening/closing body continuous with the first peak in the second opening/closing angle range. 2. The hinge of claim 1, wherein: 2. The second operating cam portion according to claim 1, wherein the second operating cam portion is provided so as to protrude further outward than the first operating cam portion in a diametrical direction of the support member about the hinge shaft. hinge. The second operating cam portion has a lift surface that presses down the slider to increase the compression of the compression coil spring as the support member rotates toward 0 degrees in the second opening/closing angle range, and a lift surface that follows the lift surface. 6. The hinge of claim 5, further comprising a slip surface for slipping said second actuating cam portion and said second pressure receiving cam portion to reduce compression of said compression coil spring. The second pressure-receiving cam portion has a vertical pressure-receiving slip surface facing the hinge shaft,
The slip surface of the second operating cam portion faces the pressure-receiving slip surface and starts slipping as the support member rotates toward 0 degrees in the second opening/closing angle range. 7. A hinge according to Item 6. 8. An office equipment, characterized in that the hinge according to any one of claims 1 to 7 is provided between an apparatus main body and an original pressing plate.

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