Hinge device and office machine using the same

Abstract

The present invention provides a hinge device and an office machine using the hinge device. The hinge device of the present invention connects the main body of the office machine and a cover mounted on the main body so that the cover can be opened and closed. The hinge device includes: a mounting box with an open top and mounted in a mounting hole provided on the main body to enable installation and removal; a support member that supports the cover so that the cover is mounted on the mounting box via a hinge shaft made of a conductive material to enable opening and closing; a frame member also made of a conductive material, connected to the hinge shaft and accommodated in the mounting box; a sliding member that is accommodated in the mounting box and can slide; an elastic member elastically disposed between the sliding member and the mounting box; an action cam portion disposed on the support member and press-fitted with a pressure-receiving cam portion provided on the top of the sliding member; a conductive wire that conducts electricity through the hinge shaft and is connected to the cover; and an electrode member.

Description

Technical Field

[0001] The present invention relates to a hinge device and an office machine using the hinge device. The hinge device is suitable for installing a manuscript pressing plate of an office machine (such as a small household copier or a small multifunction machine) to a machine body so that the machine can be opened and closed. Background Art

[0002] So far, there have been various proposals for hinge devices that connect the main body of an office machine (such as a small copier, etc.) to a manuscript pressing plate (hereinafter referred to as a cover body) installed on the main body so that it can be opened and closed. Among them, the one disclosed in Japanese Patent Gazette No. 2018-5015 is already well known. The aforementioned hinge device includes a mounting box, a supporting member, a sliding member, an elastic member and an action cam portion. The upper portion of the mounting box is open and is mounted on a mounting hole provided on the main body so that it can be loaded and unloaded; the supporting member supports the cover body so that it can be mounted on the mounting box through a hinge shaft so that it can be opened and closed; the sliding member is accommodated in the mounting box so that it can slide; the elastic member is elastically arranged between the sliding member and the mounting box; the action cam portion is arranged on the supporting member and is pressed against the pressure cam portion provided on the top of the sliding member.

[0003] In the aforementioned hinge device, one or both of the mounting box (mounting member) and the supporting member are formed from a non-conductive synthetic resin (such as ABS resin, etc.). In this case, the hinge device must have a common grounding function between the machine body and the cover.

[0004] Therefore, in the hinge device disclosed in Japanese Patent Gazette No. 2018-5015, a frame member (metal plate box) made of conductive material and housed in an installation box (installation member) is grounded by connecting a second electrode member exposed on the surface of the installation box to a grounding wire member provided on the main body; on the other hand, a first electrode member that is exposed on the surface of the supporting member and is connected to the conductive cover is in contact with the second electrode member so as to be able to rotate relative to each other.

[0005] However, in the hinge device disclosed in Patent Gazette No. 2018-5015, a second electrode member must be provided along the surface of the mounting box and a first electrode member must be provided along the surface of the supporting member. During assembly, the second electrode member and the first electrode member must be kept in contact and allowed to rotate relative to each other, resulting in an increase in both parts cost and assembly cost. Summary of the Invention

[0006] The object of the present invention is to provide a hinge device and an office machine using the hinge device, which can not only reduce the cost of parts and assembly costs, but also can stably ground the machine body side and the cover body side.

[0007] To achieve the above-mentioned purpose, the hinge device of the present invention connects the main body of an office machine and the cover mounted on the main body so that they can be opened and closed. The hinge device includes a mounting box, a support member, a frame member, a sliding member, an elastic member, an action cam portion, a conductive wire, and an electrode member. The upper portion of the mounting box is open and is mounted in a mounting hole provided on the main body so that it can be loaded and unloaded; the support member supports the cover so that the cover is mounted on the mounting box via a hinge shaft made of a conductive material so that it can be opened and closed; the frame member is also made of a conductive material, connected to the hinge shaft and accommodated in the mounting box; the sliding member is accommodated in the mounting box so that it can slide; the elastic member is elastically arranged between the sliding member and the mounting box; the action cam is arranged on the support member and is pressed against the pressure cam portion provided on the top of the sliding member; the conductive wire conducts the hinge shaft and is connected to the cover; the electrode member is arranged on the outside of the bottom of the mounting box and is connected to the frame member via mounting screws made of a conductive material. When the mounting box is inserted into the mounting hole, the electrode member forms an electrical contact with the main body.

[0008] Secondly, the hinge device of the present invention is provided with a pair of sliding friction parts on the side of the sliding part, which slide and rub against the side plates on both sides of the frame component; a convex part consistent with the sliding direction is provided in the middle of the pair of sliding friction parts of the sliding part; and a receiving groove is provided on the inner side of the mounting box, which receives the convex part of the sliding part and guides the convex part to the sliding direction.

[0009] Furthermore, the hinge device of the present invention includes friction portions that protrude inward from the side plates on both sides of the frame member so as to be symmetrical with each other and that come into pressure contact with and rub against the side surfaces of the slider.

[0010] Then, the hinge device of the present invention includes a conductive promoting member, which allows the hinge shaft to pass through and is clamped and held between the side plate on one side of the frame member and the inner wall of the installation box, so that the current passing through the hinge shaft and the side plate can be dispersed.

[0011] The office machine of the present invention uses the hinge device described above to enable the cover of the office machine to be opened and closed relative to the main body of the office machine.

[0012] Due to the above-described structure, even if the mounting box and support member, which are connected by the hinge shaft for relative rotation, are made of a non-conductive synthetic resin, a simple structure can be used to form a grounding circuit between the electrode member, the frame member, and the hinge shaft, thereby ensuring electrical continuity. Therefore, the hinge device provided by the present invention and the office machine using the hinge device can be constructed using inexpensive materials, and electrical continuity can be easily established between the machine body and the cover during assembly.

[0013] In the hinge device of the present invention, the receiving groove in the mounting box guides the protruding strip of the sliding member to slide in the sliding direction, thereby preventing the sliding member from being displaced or tilted when the sliding member moves.

[0014] In the hinge device of the present invention, the angular range of friction generated from the mounting box to the sliding member can be controlled by simply determining the position and length of the friction portion provided on the frame member in the sliding direction. Furthermore, the intensity of the friction can be controlled by simply determining the width and height of the friction portion provided on the frame member.

[0015] In the hinge device of the present invention, the relatively thin and flexible conductive promoting member can reliably conduct electricity between the relatively thick and hard hinge shaft and the frame member, so that the machine body side and the cover body side can be stably grounded.

[0016] If an office machine uses the hinge device of the present invention, the cost of parts and assembly costs can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a perspective view of a copy machine, which is an example of an office machine using the hinge device of the present invention.

[0018] Figure 2 for Figure 1 The present invention is a partial cross-sectional view of the office machine including the hinge device when the cover of the office machine is in an open state.

[0019] Figure 3 for Figure 1 The present invention is a partial cross-sectional view of the office machine including the hinge device when the cover of the office machine is in a closed state.

[0020] Figure 4 for Figure 3 The hinge device shown is in a state where the conductive wires are removed, and is an overall three-dimensional diagram viewed from obliquely below.

[0021] Figure 5 for Figure 4 An exploded perspective view of the hinge assembly is shown.

[0022] Figure 6 for Figure 4 A cross-sectional view of the hinge device shown is taken through the center of the hinge axis and parallel to the hinge axis.

[0023] Figure 7 for Figure 5 The structural illustration of the frame member shown is as follows: (a) is a side view; (b) is a cross-sectional view passing through the center of the hinge axis and parallel to the hinge axis.

[0024] Figure 8 for Figure 5 The diagrams for explaining the structure of the conduction promoting member shown are: (a) a stereoscopic diagram; and (b) a partial stereoscopic diagram.

[0025] Figure 9 for Figure 5The diagram for explaining the structure of the electrode member shown is a perspective view of the electrode member as viewed from above.

[0026] Figure 10 It is an explanatory diagram of the guide structure of the slider and the positioning structure of the frame member, and is also a plan view of the installation box.

[0027] Figure 11 When the cover is in the open state, Figure 7 The diagram illustrating the operation of the sliding friction portion of the frame member is also a longitudinal sectional view of the hinge device when the cover is in the open state.

[0028] Figure 12 When the cover is in the closed state, Figure 7 The diagram illustrating the operation of the sliding friction portion of the frame member is also a longitudinal sectional view of the hinge device when the lid is in the closed state. DETAILED DESCRIPTION

[0029] The following describes in detail the hinge device of the present invention and an office machine using the hinge device, based on the accompanying drawings. In the various drawings, components denoted by the same reference numerals have the same or equivalent structure and function. Furthermore, the present invention is not limited to the illustrated embodiments and encompasses various embodiments within the scope of the claims.

[0030] Figure 1 A copy machine is one example of an office machine 1 using the hinge devices 2, 2 of the present invention. Figures 2 and 3 This is an enlarged cross-sectional view of the hinge device 2 of the present invention installed on an office machine 1. The office machine 1 includes a machine body 11, a cover 12, and hinge devices 2, 2. The cover 12 presses a document placed on an exposure glass 13 provided on the upper surface of the machine body 11 against the exposure glass 13. The hinge devices 2, 2 connect the cover 12 to the machine body 11, allowing it to open and close. Reference numeral 14 denotes an operation panel.

[0031] Examples of office machines 1 include copiers, printers, fax machines, and scanners. While copiers are particularly suitable, the present invention is not limited to this specific office machine. Furthermore, in the embodiment, the hinge devices 2, 2 on the left and right sides of the office machine 1 utilize identical components. However, in a copier that opens and closes a cover 12 attached to an automatic document feeder, the hinge devices typically differ in configuration, size, and material between the left side of the front panel (i.e., the heavier side) and the right side (i.e., the lighter side).

[0032] Figures 2 to 10This is an embodiment of the hinge device 2, 2 of the present invention. Due to the same structure, only one of them is described. The hinge device 2 includes a mounting box 21, a support member 22, a frame member 20, a sliding member 24, an elastic member 25 and an action cam portion 22c. The mounting box 21 is made of synthetic resin, and its upper portion is open and can be loaded and unloaded on the mounting hole 11a provided on the machine body 11; the support member 22 is also made of synthetic resin, supporting the cover body 12 so that it can be opened and closed and installed on the mounting box 21 through the hinge shaft 23 of conductive material; the frame member 20 is also made of conductive material, connected to the hinge shaft 23 and accommodated in the mounting box 21; the sliding member 24 can be slidably accommodated in the mounting box 21; the elastic member 25 is elastically arranged between the sliding member 24 and the mounting box 21; the action cam portion 22c is arranged on the support member 22 so as to be pressed against the pressure cam portion 24c provided on the top of the sliding member 24.

[0033] like Figure 5 As shown, the mounting box 21 comprises a cylindrical box portion 21a with an open top and a bottom 21b, and a pair of side panels 21c and 21d spaced apart upward from either side of the box portion 21a. A flange 21e is circumferentially disposed around the upper periphery of the box portion 21a. Each of the side panels 21c and 21d has a deformable connecting hole 21f and a circular connecting hole 21g, both of which have a common axis for inserting the hinge shaft 23.

[0034] Installation box 21 as Figure 2 、 Figure 3 As shown, a portion of the box portion 21a is inserted into the mounting hole 11a, which is arranged vertically on the upper rear portion of the machine body 11, and can be attached and detached. However, the structure of the mounting box 21 is not limited to the embodiment. A fall-prevention protrusion 21j is provided at the lower rear end of the box portion 21a. When a heavy document, such as a book, is placed on the exposure glass 13 for copying, the hinge assembly 2 is lifted upward to horizontally cover the upper portion of the heavy document. This fall-prevention protrusion 21j serves as a stopper, preventing the mounting box 21 from falling out of the mounting hole 11a. Reference symbol 11f denotes a guide groove for the fall-prevention protrusion 21j, and reference symbol 11g denotes a stopper. Furthermore, when the box portion 21a is inserted into the mounting hole 11a of the machine body 11, the box portion 21a is tilted and passed through the entrance 11b of the mounting hole 11a using the notch in the conical surface 21p. Thereafter, when the box portion 21 a is dropped vertically into the mounting hole 11 a , the conductive member 28 elastically contacts the electrode member 26 as will be described later.

[0035] Support member 22 such as Figures 2 to 5As shown, the mounting box 21 and the supporting member 22 are composed of a main body 22a and a pair of mounting portions 22b, 22b projecting horizontally from either side of the main body 22a. The mounting portions 22b, 22b are mounted to the cover 12 via mounting screws 22p, 22p, ... In addition, an operating cam portion 22c is projecting from the underside of the main body 22a. The mounting box 21 and the supporting member 22 are connected by a hinge shaft 23 extending through deformable connecting holes 21f and circular connecting holes 21g provided on the side panels 21c, 21d of the mounting box 21, and a circular connecting hole 22d provided on the main body 22a of the supporting member 22, allowing for relative rotation. An elastic member 25 composed of a compression coil spring is housed within the box 21a. The upper portion of a cylindrical slider 24 covering the elastic member 25 is in press-fit contact with the operating cam portion 22c of the supporting member 22. Indicated at 22 n are mounting holes for mounting the mounting portions 22 b and 22 b of the support member 22 to be mounted on the cover 12 .

[0036] like Figure 6 As shown, hinge shaft 23 is composed of a circular shaft portion 23a, a deformable shaft portion 23b extending from circular shaft portion 23a, and a head portion 23c extending from deformable shaft portion 23b. The circular shaft portion 23a and deformable shaft portion 23b of hinge shaft 23 are passed through deformable connection holes 21f and circular connection holes 21g provided on the side panels 21c and 21d of mounting box 21, as well as circular connection hole 22d of support member 22. The end of circular shaft portion 23a is locked to prevent it from falling out in the axial direction. The deformable shaft portion 23b of hinge shaft 23 and the deformable connection hole 21f provided on the side panel 21c of mounting box 21 engage with each other, preventing hinge shaft 23 from rotating with support member 22.

[0037] like Figure 7 As shown, the frame member 20 is made by punching a rigid metal plate such as SUS, and includes a bottom plate 20c and a pair of side plates 20b, 20b formed by bending upward from both sides of the bottom plate 20c. Figure 10 The recess 21 k shown maintains the contour of the bottom plate portion 20 c of the frame member 20 and determines the position of the frame member 20 in the mounting box 21 .

[0038] like Figure 6As shown, the compressed elastic member 25 in the frame member 20 disperses the tensile force between the hinge shaft 23 and the bottom plate 20c of the installation box 21, thereby reducing the burden on the installation box 21. The frame member 20 is housed within the box portion 21a of the installation box 21, with the hinge shaft 23 passing through connecting holes 20e, 20e provided in the upper portions of the side plates 20b, 20b, thereby retaining it within the box portion 21a. The frame member 20 houses the elastic member 25, which is composed of a compression coil spring, and the slider 24 covering the elastic member 25. The slider 24 is in press-fit contact with the actuating cam portion 22c of the support member 22.

[0039] The side surface of the sliding member 24 is provided with a pair of sliding friction parts 24b, 24b that slide and rub against the side plates 20b on both sides of the frame member 20, and a convex strip part 24d that is consistent with the sliding direction is provided in the middle of the pair of sliding friction parts 24b, 24b of the sliding member 24. Figure 10 As shown, corresponding to the protrusion 24d, a receiving groove 21i is provided on the inner side of the mounting box 21 to receive the protrusion 24d and guide the slider 24 in the sliding direction. Therefore, the slider 24 is maintained vertically within the box portion 21a, and the left and right sliding friction portions 24b, 24b centered around the protrusion 24d can slide and rub against the side plates 20b, 20b on both sides in a balanced and stable manner.

[0040] like Figure 7 As shown in (b), the side plates 20b on both sides of the frame member 20 protrude symmetrically inward and are provided with friction portions 20f, 20f. Figure 6 As shown, the friction portions 20f, 20f press against the side surfaces of the slider 24 and rub against them, generating frictional resistance. This reduces the speed of the cover 12 and the impact force on the exposure glass 13 if it accidentally falls from the top of the machine body 11. Furthermore, in the hinge device 2 of the common design, by replacing the frame member 20 with different sliding direction ranges and positions of the friction portions 20f, 20f, the response to the opening and closing operation of the cover 12 of the office machine 1 can be set.

[0041] like Figure 12 As shown, when the cover 12 is closed relative to the device body 11, the hinge device 2 generates a rotational torque around the hinge axis 23 due to the weight of the cover 12, causing the operating cam portion 22c of the support member 22 to compress the elastic member 25 via the slider 24. At this time, the operating cam portion 22c presses down the slider 24, increasing the compression of the elastic member 25, thereby maximizing the force to lift the cover 12.

[0042] As the cover 12 is moved from a closed position relative to the machine body 11 to an open position, the hinge device 2 pushes the cover 12 upwards in the opening direction via the support member 22 through the reaction force of the elastic member 25, reducing the weight torque of the cover 12 and allowing it to be opened with less effort. Furthermore, if the elastic force of the elastic member 25 is greater than the weight of the cover 12, the cover 12 will automatically be lifted from a specific opening angle. Figure 2 As shown, the convex portion 22e of the support member 22 abuts against the stopper 21n provided on the upper edge of the box portion 21a of the mounting box 21 and stops. Figure 11 As shown, when the lid 12 is open, the slider 24 rises as the actuating cam portion 22c rises, reducing the compression of the elastic member 25 and minimizing the force required to lift the lid 12. When the hinge device 2 closes the opened lid 12, the elastic force of the elastic member 25 can cushion the sudden closing of the lid 12.

[0043] Next, we will explain the grounding circuit of the hinge device 2. In this embodiment, the mounting box 21 is made of synthetic resin, the supporting member 22 is also made of synthetic resin, the hinge shaft 23 is made of stainless steel, the frame member 20 is also made of stainless steel, the slider 24 is made of synthetic resin, and the elastic member 25 is a steel compression coil spring. Therefore, due to factors such as frictional generation between these components, unintended high voltage or short-circuit noise may occur between the cover 12 and the device body 11. Therefore, the hinge device 2 has a grounding circuit 30 inside the box portion 21a, which utilizes the original frame member 20 as a conductive path.

[0044] The ground connection circuit 30 includes a conductive wire 27 connected to the hinge shaft 23 and to the cover 12, and an electrode member 26 connected to the frame member 20 located on the bottom outside of the mounting box 21 via a conductive mounting screw 26b. When the mounting box 21 is inserted into the mounting hole 11a of the device body 11, the conductive member 28 located on the inner bottom of the mounting hole 11a and electrically connected to the device body 11 and the electrode member 26 form electrical contact. In other words, the ground connection circuit 30 electrically connects the hinge shaft 23, with the conductive wire 27 fixed to its non-rotating end, and the electrode member 26, located on the bottom of the mounting box 21 with its electrode surface exposed, via the frame member 20 within the mounting box 21.

[0045] like Figure 2 、 Figure 3 As shown, a conductive member 28 is provided at the inner bottom of the mounting hole 11a and is in elastic contact with the electrode member 26 that is electrically conductive with the machine body 11. Figure 2 、 Figure 3 、 Figure 6 、 Figure 11 、 Figure 12The conductive member 28 is shown avoiding overlapping surrounding members; its size and position are not as shown. The conductive member 28 is not limited to the illustrated embodiment. For example, an electrode body 28a formed from a thin stainless steel plate is attached to the device body 11 using screws 28b and welded to a grounding wire 28c connected to the metal frame of the device body 11. When the hinge device 2 and the conductive member 28 insert the mounting box 21 into the mounting hole 11a, the conductive member 28 and the electrode member 26 come into electrical contact. The conductive member 28 follows the movement of the mounting box 21 using the spring force of the electrode body 28a, absorbing the lifting force of the mounting box 21 only at a specific distance to maintain contact with the electrode member 26.

[0046] like Figure 9 As shown, the electrode member 26 is formed by punching a conductive copper plate into a circular shape, and forming a thin circular plate-shaped electrode 26c, a central through hole 26a and a conical surface 26d for receiving the head of a flat head screw 26b. Figure 6 As shown, the electrode member 26 is provided outside the bottom of the mounting box 21 and forms a flat electrode surface in which the head of the mounting screw 26b of the flat head screw inserted into the through hole 26a is accommodated in the conical surface 26d.

[0047] like Figure 6 As shown, the frame member 20 is housed within the box portion 21a of the mounting box 21. With the circular shaft portion 23a of the hinge shaft 23 inserted through the connection holes 20e, 20e of the side panels 20b, 20b and held within the box portion 21a, the hinge shaft 23 is electrically connected to the electrode member 26. The frame member 20 is secured to the mounting box 21 and electrically connected to the frame member 20 by fastening mounting screws 26b, which are made of conductive flat-head screws, to the internal threads 20d of the bottom plate portion 20c. The elastic member 25 applies force to the circular shaft portion 23a of the hinge shaft 23, causing it to press against the upper edges of the connection holes 20e, 20e, thereby electrically connecting the hinge shaft 23 to the frame member 20.

[0048] As described above, the hinge shaft 23 is fixed to its rotation by inserting the deformable shaft portion 23b into the deformable coupling hole 21f, and the frame member 20 is fixed inside the mounting box 21. Therefore, when the lid 12 is opened or closed, the hinge shaft 23 does not rotate relative to the frame member 20. Therefore, there is essentially no problem of poor contact or noise caused by sliding friction between the hinge shaft 23 and the frame member 20.

[0049] The crimp terminals 27b and 27c of the conductive wire 27 are fixed to the ends of the flexible wire body 27a. The deformable shaft portion 23b of the conductive wire 27 is inserted into the deformable connecting hole 21f, and the crimp terminal 27b at one end is secured to the internal thread 23e at the end of the hinge shaft 23, which is fixed and rotatable in the mounting box 21. Therefore, even when the cover 12 is rotated, the end of the conductive wire 27, including the crimp terminal 27b, remains in a fixed position, preventing the conductive wire 27 from becoming fatigued or tangled around the crimp terminal 27b. Furthermore, the connection using the crimp terminal 27b can be replaced with welding, soldering, or joining using flexible metal wire.

[0050] In this embodiment, the crimping terminal 27c at the other end of the conductive wire 27 is secured to the metal portion of the cover 12 by a screw 23g. While the metal frame of the cover 12 can be used as the metal portion of the cover 12, the wire body 27a of the conductive wire 27 is flexible and can be arbitrarily sized. Therefore, it can be a circuit board or motor housed in the cover 12 (not shown).

[0051] like Figure 6 As shown, the circular shaft portion 23a of the hinge shaft 23 is pressed against the upper edges of the connecting holes 20e, 20e, electrically connected to the frame member 20. A conductive member 29 extends through the hinge shaft 23 and is held between one side plate 20b of the frame member 20 and the inner wall of the mounting box 21, electrically separating the hinge shaft 23 and the side plate 20b. The interposition of the conductive member 29 reduces the generation of noise at ground potential in response to vibration and impact on the cover 12.

[0052] like Figure 8 As shown in (a), the conductive promoting member 29 is formed by punching a thin conductive copper plate, and a through hole 29a is provided in the center of the U-shaped outer shape, a rotation regulating portion 29b is provided above, and a convex portion 29c is formed at the lower end edge of the through hole 29a.

[0053] like Figure 2 、 Figure 3 As shown, the conduction promoting member 29 regulates the rotation by engaging the rotation regulating portion 29b with the side plate 21c of the mounting box 21. Figure 6 As shown, the convex portion 29c of the conduction promoting member 29 is held on the circular shaft portion 23a and the stepped portion 23d of the deformable shaft portion 23b, preventing deformation. The convex portion 29c does not allow the conduction promoting member 29 to have any play or looseness, and ensures electrical contact with the hinge shaft 23.

[0054] Because the present invention has the above-mentioned structure, even if the mounting components and the support box that are connected to each other through the hinge shaft to be rotated are made of non-conductive materials, it can be applied to the hinge device of an office machine whose machine body and cover can be grounded, and the office machine that uses the hinge device as a single one or a pair with a simple structure.

Claims

1. A hinge device that connects a main body of an office machine and a cover mounted on the main body to enable opening and closing, the hinge device comprising: The mounting box has an opening at its upper portion and is mounted in a mounting hole provided on the main body so as to be assembled and disassembled; A supporting member, which supports the cover so that the cover is mounted on the mounting box via a hinge shaft made of a conductive material so as to be opened and closed; a frame member made of a conductive material, connected to the hinge shaft and accommodated in the installation box; a sliding member accommodated in the installation box and capable of sliding; an elastic member elastically disposed between the sliding member and the mounting box; an action cam portion, which is provided on the support member and is in pressure contact with a pressure-receiving cam portion provided on the top of the sliding member; a conductive wire, which conducts through the hinge axis and is connected to the cover; and an electrode member, which is disposed on the outside of the bottom of the mounting box and is connected to the frame member via mounting screws made of conductive material; When the mounting box is inserted into the mounting hole, the electrode component forms electrical contact with the body.

2. The hinge device according to claim 1, wherein a pair of sliding friction parts are provided on the side of the sliding member, which slide and rub against the side plates on both sides of the frame member; a convex portion consistent with the sliding direction is provided in the middle of the pair of sliding friction parts of the sliding member; a receiving groove is provided on the inner side of the mounting box, and the receiving groove receives the convex portion of the sliding member and guides the convex portion to the sliding direction.

3. The hinge device according to claim 1, further comprising friction portions protruding inward from side plates on both sides of the frame member so as to be symmetrical with each other and press-contacting and rubbing against side surfaces of the sliding member.

4. The hinge device as described in claim 1 further includes a conductive promoting component, which allows the hinge shaft to pass through and is clamped and held between the side plate on one side of the frame member and the inner wall of the installation box, so that the current passing through the hinge shaft and the side plate can be dispersed.

5. An office machine, using the hinge device according to any one of claims 1 to 4, so that a cover of the office machine can be opened and closed relative to a main body of the office machine.

Images