Hinge device and business machine using the hinge device

Abstract

To provide a hinge device that is constituted by using inexpensive materials and allows easy ground connection between a machine body side and a lid body side during assembly of a business machine, and the business machine.SOLUTION: A hinge device has: an attachment case 21; a support member 22 that supports a lid body attached to the attachment case in an openable and closable manner with a hinge shaft 23 made of a conductive material; a frame member 20 made of a conductive material that is accommodated in the attachment case while connected with the hinge shaft; a slider 23 that is accommodated in the attachment case in a slidable manner; an elastic member 25 that is elastically provided between the slider and the attachment case; and an operation cam part 22c that is provided on the support member in pressure contact with a pressure receiving cam part 24c provided at an apex of the slider. The hinge device further has a conductive cord 27 that is connected with the lid body and in conduction with the hinge shaft, and an electrode member 26 that is provided outside a bottom part of the attachment case and connected with the frame member via an attachment screw 26b made of a conductive material. The electrode member is brought into electrical contact with a device body when the attachment case is inserted into an attachment hole.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention is applicable to, for example, small-sized copying machines and small-sized multifunction machines for home use. About office equipment When attaching the original cover to the device body so that it can be opened and closed, The present invention relates to a hinge device suitable for use in an office machine, and to an office machine using the hinge device. [Background technology]

[0002] Various hinge devices have been proposed for connecting an apparatus body of an office machine such as a small copying machine and an original cover (hereinafter referred to as a cover) attached to the apparatus body in an openable manner. Among them, the one described in the following Patent Document 1 is well known. This hinge device has an upper-open mounting case that is removably attached to a mounting hole provided in the apparatus body, a support member that supports the cover that is openably attached to the mounting case via a hinge shaft, a slider slidably accommodated in the mounting case, an elastic member elastically provided between the slider and the mounting case, and an operating cam portion provided on the support member in pressure contact with a pressure-receiving cam portion provided on the top of the slider.

[0003] In the case of such a hinge device, Mounting case (also called mounting parts) Either the support member or both of the support members are made of a molded non-conductive synthetic resin such as ABS resin. Device body It is necessary to provide a common earth connection between the housing and the lid.

[0004] Therefore, in the hinge device of Patent Document 1, a frame member (sheet metal case) made of a conductive material housed within a mounting case (mounting member) is earthed to an earth member provided on the device body via a second electrode member exposed on the surface of the mounting case, while a first electrode member exposed on the surface of the support member, which is conductive to the cover body, is brought into contact with the second electrode member so as to be rotatable relative to the first electrode member. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2018-5015 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the hinge device of Patent Document 1, it is necessary to provide a second electrode member along the surface of the mounting case, provide a first electrode member along the surface of the support member, and assemble the second electrode member and the first electrode member while maintaining contact and allowing relative rotation, which results in high component and assembly costs.

[0007] Therefore, the object of the present invention is to reduce the cost of parts and assembly, Device body The object of the present invention is to provide a hinge device capable of earthing the cabinet side and the lid side, and an office machine using this hinge device. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the hinge device according to claim 1 of the present invention is a hinge device for opening and closing an office equipment main body and a lid body attached to the main body, comprising: an upper-open mounting case that is removably attached to a mounting hole provided in the main body of the office equipment; a support member that supports the lid body that is openably attached to the mounting case via a hinge shaft made of a conductive material; a frame member made of a conductive material that is connected to the hinge shaft and housed in the mounting case; a slider that is slidably housed in the mounting case; an elastic member that is elastically provided between the slider and the mounting case; an operating cam portion that is provided on the support member and is pressed against a pressure-receiving cam portion provided on the top of the slider; a conductive cord that is electrically connected to the hinge shaft and connected to the lid body; and an electrode member that is provided on the outside of the bottom of the mounting case and connected to the frame member via a mounting screw made of a conductive material, and the electrode member is configured to be in electrical contact with the main body of the office equipment when the mounting case is inserted into the mounting hole.

[0009] Next, the hinge device according to claim 2 of the present invention is characterized in that a pair of sliding portions that rub against the side panels on either side of the frame member are provided on the side surfaces of the slider, a convex rib portion in the sliding direction is provided midway between the pair of sliding portions of the slider, and an accommodation groove that accommodates the convex rib portion of the slider and guides it in the sliding direction is provided on the inside of the mounting case.

[0010] Next, a hinge device according to claim 3 of the present invention is characterized in that it has friction parts that are provided so as to protrude symmetrically inward from both side plates of the frame member and that come into pressure contact with and friction with the side surfaces of the slider.

[0011] Next, the hinge device according to claim 4 of the present invention is characterized in that it includes a conductivity promoting member that passes through the hinge shaft and is sandwiched and held between one side plate of the frame member and an inner wall of the mounting case, and that electrically bypasses the hinge shaft and the side plate.

[0012] An office machine according to a fifth aspect of the present invention is characterized in that a cover is made openable and closable with respect to a machine body by using the hinge device according to any one of the first to fourth aspects. Effect of the Invention

[0013] By configuring the present invention as described above, even if the mounting case and the support member, which are rotatably connected to each other via the hinge shaft, are made of a non-conductive synthetic resin, the electrode member, the frame member and the hinge shaft can be simply configured to ensure electrical continuity as an earth connection circuit. Therefore, the present invention is configured using inexpensive materials and can be easily assembled during the assembly of the office equipment. Device body side and the lid side can be easily electrically connected Continuity It is possible to provide a hinge device and an office machine that can achieve this.

[0014] According to the hinge device of claim 2, the projection portion of the slider is guided in the sliding direction by the receiving groove of the mounting case, so that center shift or tilt of the slider due to the movement of the slider can be prevented.

[0015] According to the hinge device of claim 3, the angle range in which friction acts on the slider from the mounting case can be controlled by the position in the sliding direction and the length of the friction part provided on the frame member. Also, the magnitude of friction can be controlled by the width and height of the friction part provided on the frame member.

[0016] According to the hinge device of claim 4, the electrical conduction between the relatively thick and hard hinge shaft and the frame member is ensured via the relatively thin and soft electrical conduction promoting member, Device body This allows a stable earth connection between the container side and the lid side. According to an office machine using the hinge device according to claim 5, the parts cost and the assembly cost can be reduced. [Brief description of the drawings]

[0017] [Figure 1] 1 is a perspective view of a copying machine as an example of an office machine using a hinge device according to the present invention; [Diagram 2] 2 is a partial cross-sectional view of the office machine including the hinge device shown in FIG. 1 with the cover of the office machine in an open state. [Diagram 3] 2 is a partial cross-sectional view of the office equipment including the hinge device shown in FIG. 1 with the cover of the office equipment in a closed state. [Figure 4] 4 is an overall perspective view of the hinge device as viewed from diagonally below with the conductive cord shown in FIG. 3 removed. FIG. [Diagram 5] FIG. 5 is an exploded perspective view of the hinge device shown in FIG. [Figure 6] 5 is a cross-sectional view of a cross section passing through the center of the hinge shaft in the hinge device shown in FIG. 4 and parallel to the hinge shaft. [Figure 7] 6 is an explanatory diagram of the configuration of the frame member shown in FIG. 5, where (a) is a side view and (b) is a cross-sectional view parallel to the hinge shaft and passing through the center of the hinge shaft. FIG. [Figure 8] 6A and 6B are explanatory views of the configuration of the conductivity promoting member shown in FIG. 5, in which (a) is a perspective view and (b) is a partial perspective view. [Figure 9]FIG. 6 is an explanatory diagram of the configuration of the electrode member shown in FIG. 5, and is a perspective view of the electrode member as viewed from above. [Figure 10] FIG. 13 is an explanatory diagram of a guide structure for the slider and a positioning structure for the frame member, and is a plan view of the mounting case. [Figure 11] 8 is an explanatory diagram of the operation of the sliding portion of the frame member shown in FIG. 7 when the lid is open, and is a vertical sectional view of the hinge device when the lid is open. FIG. [Figure 12] 8 is a diagram illustrating the operation of the sliding portion of the frame member shown in FIG. 7 when the lid is closed, and is a vertical cross-sectional view of the hinge device when the lid is closed. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The hinge device according to the present invention and the office equipment equipped with the hinge device will be described in detail below with reference to the attached drawings. In each of the attached drawings, the same reference symbols indicate components having the same or equivalent configurations and functions. Furthermore, the present invention is not limited to the configurations of the illustrated embodiments, but includes various embodiments within the scope of the claims.

[0019] FIG. 1 is a diagram showing a copying machine as an example of an office machine 1 using hinge devices 2, 2 according to the present invention. FIGS. 2 and 3 are enlarged cross-sectional views of the office machine 1 to which the hinge device 2 according to the present invention is attached. The office machine 1 is Device body 11 and this Device body A cover 12 is provided on the top surface of the document 11, and presses the document or the like placed on the contact glass 13 against the contact glass 13. Device body The hinge device 2 is connected to the door 11 so as to be able to open and close. Reference numeral 14 denotes an operation panel.

[0020] The types of office equipment 1 are exemplified as copiers, printers, facsimiles, scanners, etc., and copiers are particularly preferred, but the present invention is not limited to the embodiments of such specific office equipment. In the embodiments, the same hinge devices 2, 2 are used on the left and right sides of the office equipment 1, but in a copier that opens and closes a cover 12 equipped with an automatic document feeder, it is normal to use different configurations, sizes, materials, etc. of the hinge devices on the heavy side on the left side where the automatic document feeder is attached and on the lighter side on the right side.

[0021] 2 to 10 show an embodiment of the hinge device 2, 2 according to the present invention. Since they have the same configuration, only one of them will be explained. The hinge device 2 has Device body the cover 12 is attached to the mounting case 21 via a hinge shaft 23 made of a conductive material so as to be able to open and close; a frame member 20, also made of a conductive material, housed within the mounting case 21 and connected to the hinge shaft 23; a slider 24 housed slidably within the mounting case 21; an elastic member 25 elastically provided between the slider 24 and the mounting case 21; and an operating cam portion 22c provided on the support member 22 in pressure contact with a pressure-receiving cam portion 24c provided at the top of the slider 24.

[0022] 5, the mounting case 21 is composed of a cylindrical case part 21a with an open top and a bottom part 21b, and a pair of side plates 21c, 21d protruding upward from both sides of the case part 21a at a predetermined interval, and a flange part 21e is provided around the upper part of the outer periphery of the case part 21a. Each of the side plates 21c, 21d is provided with a modified connecting hole 21f and a circular connecting hole 21g, into which the hinge shaft 23 is inserted, with the same axis.

[0023] As shown in FIG. 2 and FIG. 3, the mounting case 21 has a case portion 21a. Device bodyThe mounting case 21 is removably attached by being inserted into a mounting hole 11a provided in the vertical direction at the rear of the top surface of the hinge 11. However, the configuration of this mounting case 21 is not limited to that of the embodiment. When a thick original such as a book is placed on the contact glass 13 for copying, it is necessary for the entire hinge device 2 to be lifted upward so that it can horizontally cover the top of the thick original. The anti-slip protrusion 21j provided on the lower end side of the rear of the case portion 21a serves as a stopper to prevent the mounting case 21 from slipping out of the mounting hole 11a at this time. Designation symbol 11f is a guide groove for the anti-slip protrusion 21j, and 11g is a stopper portion. Note that when the case portion 21a is Device body When inserting the case 21a into the mounting hole 11a of the case 11, the case 21a is tilted and the notch of the conical surface 21p is used. Mounting Hole Then, the case portion 21a is turned vertically to pass through the inlet 11b of the case portion 21a. Mounting Hole When dropped into 11a, the conductive member 28 elastically contacts the electrode member 26, as will be described later.

[0024] As shown in Figs. 2 to 5, the support member 22 is composed of a main body portion 22a and a pair of mounting portions 22b, 22b protruding horizontally from both sides of the main body portion 22a, and the mounting portions 22b, 22b are attached to the cover body 12 via mounting screws 22p, 22p, .... An operating cam portion 22c is protruding from the lower surface side of the main body portion 22a. The mounting case 21 and the support member 22 are rotatably connected to each other by passing a hinge shaft 23 through a deformed connecting hole 21f and a circular connecting hole 21g provided in each side plate 21c, 21d of the mounting case 21 and a circular connecting hole 22d provided in the main body portion 22a of the support member 22. An elastic member 25 made of a compression coil spring is housed in the case portion 21a, and the upper portion of a cylindrical slider 24 covered with the elastic member 25 is always in a pressure contact state with the operating cam portion 22c of the support member 22. The reference symbol 22n denotes a mounting hole for mounting the mounting portions 22b, 22b of the support member 22 to the lid 12.

[0025] 6, the hinge shaft 23 is composed of a circular shaft portion 23a, a deformed shaft portion 23b provided subsequent to the circular shaft portion 23a, and a head portion 23c provided subsequent to the deformed shaft portion 23b, and the circular shaft portion 23a and the deformed shaft portion 23b of the hinge shaft 23 are passed through the deformed connecting holes 21f and the circular connecting holes 21g provided in the side plates 21c and 21d of the mounting case 21 and the circular connecting hole 22d of the support member 22, and the end of the circular shaft portion 23a is tightened so that it does not slip out in the axial direction. The deformed shaft portion 23b of the hinge shaft 23 and the deformed connecting hole 21f provided in the side plate 21c of the mounting case 21 are in an engaging relationship with each other, and the hinge shaft 23 does not rotate in accordance with the rotational movement of the support member 22.

[0026] As shown in Fig. 7, the frame member 20 is made by pressing a rigid metal plate such as SUS, and has a bottom plate portion 20c and a pair of side plates 20b, 20b formed by bending upwards from both sides of the bottom plate portion 20c. The recess 21k shown in Fig. 10 holds the contour of the bottom plate portion 20c of the frame member 20 and positions the frame member 20 in the mounting case 21.

[0027] 6, the frame member 20 reduces the load on the mounting case 21 by bypassing the tensile force that the compressed elastic member 25 exerts between the hinge shaft 23 and the bottom plate portion 20c of the mounting case 21. The frame member 20 is housed in the case portion 21a of the mounting case 21, and is held in the case portion 21a by passing the hinge shaft 23 through connecting holes 20e, 20e provided in the upper portions of the side plates 20b, 20b. The frame member 20 houses an elastic member 25 made of a compression coil spring and a slider 24 that covers the elastic member 25, and the slider 24 is always in pressure contact with the operating cam portion 22c of the support member 22.

[0028] A pair of sliding portions 24b, 24b that slide against the side plates 20b on both sides of the frame member 20 are provided on the side surface of the slider 24, and a protruding portion 24d in the sliding direction is provided between the pair of sliding portions 24b, 24b of the slider 24. As shown in Fig. 10, an accommodation groove 21i that accommodates the protruding portion 24d of the slider 24 and guides it in the sliding direction is provided on the inside of the mounting case 21 in correspondence with the protruding portion 24d. Therefore, the slider 24 is held vertically within the case portion 21a, and the left and right sliding portions 24b, 24b slide against the side plates 20b, 20b on both sides in a well-balanced and stable manner with the protruding portion 24d as the center.

[0029] As shown in Fig. 7(b), frictional portions 20f, 20f are provided symmetrically protruding inward from the side plates 20b on both sides of the frame member 20. As shown in Fig. 6, the frictional portions 20f, 20f press against the side surfaces of the slider 24 to generate friction, thereby generating friction resistance. Device body This reduces the falling speed and the impact of the collision with the contact glass 13 when the cover 12 is accidentally dropped from the sky above the contact glass 13. In addition, by replacing the frame members 20 with different sliding ranges and positions of the friction portions 20f, 20f in the commonly designed hinge device 2, the feel of the opening and closing operation of the cover 12 can be varied to suit the office equipment 1.

[0030] As shown in Figure 12, Device body With the lid 12 closed relative to the hinge 11, the hinge device 2 is in a state in which the operating cam portion 22c of the support member 22 compresses the elastic member 25 via the slider 24 due to the rotational torque generated around the hinge shaft 23 by the weight of the lid 12. At this time, the operating cam portion 22c presses down on the slider 24, increasing the amount of compression of the elastic member 25, and the force lifting the lid 12 is at its maximum.

[0031] Device bodyAs the lid 12 is opened from the state where it is closed relative to the mounting case 11, the hinge device 2 pushes the lid 12 in the opening direction via the support member 22 by the repulsive force of the elastic member 25, so that the weight torque of the lid 12 is reduced and the lid 12 can be opened with a relatively light force. Then, from a predetermined opening angle, the elastic force of the elastic member 25 exceeds the weight of the lid 12, so the lid 12 automatically rises, and as shown in FIG. 2, the protrusion 22e of the support member 22 abuts against the stopper portion 21n provided on the upper edge of the case portion 21a of the mounting case 21, so that the lid 12 is stopped. As shown in FIG. 11, when the lid 12 is open, the slider 24 rises with the rise of the operating cam portion 22c, so that the compression amount of the elastic member 25 is reduced and the force lifting the lid 12 is minimized. When closing the open lid 12, the hinge device 2 can cushion the lid 12 from being suddenly closed by the elastic force of the elastic member 25.

[0032] Next, the earth connection circuit of the hinge device 2 will be described. In this embodiment, the mounting case 21 is made of synthetic resin, the support member 22 is made of synthetic resin, the hinge shaft 23 is made of stainless steel, the frame member 20 is made of stainless steel, the slider 24 is made of synthetic resin, and the elastic member 25 is a steel compression coil spring. For this reason, electrical charges between the cover 12 and the hinge device 21 due to frictional electricity of each part, etc. Device body There is a possibility that unintended high voltage or short-circuit noise may occur between the hinge device 2 and the case 21. Therefore, the hinge device 2 is provided with an earth connection circuit 30 inside the case portion 21a, which uses the existing frame member 20 as a conductive path.

[0033] The earth connection circuit 30 has a conductive cord 27 that is electrically connected to the hinge shaft 23 and connected to the cover 12, and an electrode member 26 that is provided on the outside of the bottom of the mounting case 21 and connected to the frame member 20 via a mounting screw 26b made of a conductive material. Device body When the mounting hole 11a of Mounting Hole The part at the inner bottom of 11a Device body11 is electrically connected to the conductive member 28. In other words, the earth connection circuit 30 is configured to electrically contact the electrode member 26. The conductive member 28 is electrically connected to the hinge shaft 23, to which the conductive cord 27 is fixed at the non-rotating end, and the electrode member 26 is provided on the lower surface of the mounting case 21 with the electrode surface exposed. And, Electrical connection is made via the frame member 20 within the mounting case 21 .

[0034] As shown in Figures 2 and 3, Mounting Hole At the inner bottom of 11a, Device body 2, 3, 6, 11, and 12, the conductive member 28 is illustrated to avoid overlapping with surrounding members, and the size and position of the conductive member 28 are not as shown. The conductive member 28 is not limited to the embodiment illustrated, but as an example, an electrode body 28a formed of a thin stainless steel plate is secured to the electrode body 28a by a screw 28b. Device body Attached to 11, Device body The conductive member 28 is soldered to a ground cord 28c connected to the metal chassis of the mounting case 21. The hinge device 2 and the conductive member 28 are configured so that the conductive member 28 comes into electrical contact with the electrode member 26 when the mounting case 21 is inserted into the mounting hole 11a. The conductive member 28 follows the rising and falling of the mounting case 21 due to the spring force of the electrode body 28a, and is capable of absorbing the lifting of the mounting case 21 by a predetermined distance and maintaining contact with the electrode member 26.

[0035] As shown in Fig. 9, the electrode member 26 is formed by pressing a copper plate made of a conductive material into a circle, and at the same time, a thin disk-shaped electrode 26c, a central through hole 26a, and a conical surface 26d for receiving the head of the flat head screw 26b. As shown in Fig. 6, the electrode member 26 is provided on the outside of the bottom of the mounting case 21, and forms a flat electrode surface in which the head of the flat head screw 26b inserted into the through hole 26a is received in the conical surface 26d.

[0036] 6, the frame member 20 is housed in the case portion 21a of the mounting case 21, and the hinge shaft 23 and the electrode member 26 are electrically connected in a state where the frame member 20 is held in the case portion 21a by passing the circular shaft portion 23a of the hinge shaft 23 through the connecting holes 20e, 20e of the side plates 20b, 20b. The frame member 20 is electrically connected to the frame member 20 while fixing the electrode member 26 to the mounting case 21 by fastening the mounting screw 26b, which is a flat head screw made of a conductive material, to the female thread 20d of the bottom plate portion 20c. The hinge shaft 23 is electrically connected to the frame member 20 by being biased by the elastic member 25 to press the circular shaft portion 23a against the upper edges of the connecting holes 20e, 20e.

[0037] As described above, the hinge shaft 23 is fixed to the mounting case 21 by inserting the deformed shaft portion 23b into the deformed connecting hole 21f, and the frame member 20 is fixed to the inside of the mounting case 21. Therefore, when the cover 12 is opened or closed, the hinge shaft 23 does not rotate relative to the frame member 20. Therefore, this configuration basically does not cause poor contact or noise due to friction between the hinge shaft 23 and the frame member 20.

[0038] The conductive cord 27 has crimp terminals 27b, 27c fixed to both ends of a flexible cord body 27a. The crimp terminal 27b at one end of the conductive cord 27 is fixed by tightening a washer 23f and a screw 23g to the female screw 23e at the end of the hinge shaft 23, which is fixed to the mounting case 21 by inserting the deformed shaft portion 23b into the deformed connecting hole 21f described above. Therefore, even if the cover 12 is rotated, the one end of the conductive cord 27 including the crimp terminal 27b maintains a constant posture, and the conductive cord 27 is less likely to fatigue on the crimp terminal 27b side or to become entangled around it. The connection using the crimp terminal 27b may be replaced by welding, soldering, or connector connection using a flexible wire.

[0039] In this embodiment, the crimp terminal 27c at the other end of the conductive cord 27 is fixed to a metal part of the lid body 12 by tightening a screw 23g. The metal part of the lid body 12 can be considered to be the metal chassis of the lid body 12, but since the cord body 27a of the conductive cord 27 has flexibility and freedom in length, it may be selected arbitrarily, or it may be a circuit board or a motor (not shown) housed in the lid body 12.

[0040] 6, the hinge shaft 23 is electrically connected to the frame member 20 with the circular shaft portion 23a pressed against the upper edges of the connecting holes 20e, 20e. The conduction promotion member 29 penetrates the hinge shaft 23 and is sandwiched and held between one side plate 20b of the frame member 20 and the inner wall of the mounting case 21, electrically bypassing the hinge shaft 23 and the side plate 20b. It has been confirmed that the presence of the conduction promotion member 29 makes it difficult for noise to occur in the ground potential due to vibration or impact of the lid 12.

[0041] As shown in FIG. 8(a), the conductivity promotion member 29 is formed by pressing a thin copper plate made of conductive material, and has a through hole 29a in the center of its U-shaped outer shape, a rotation restriction portion 29b at the top, and a convex portion 29c formed on the edge of the lower end of the through hole 29a.

[0042] 2 and 3, the rotation of the conductivity promoting member 29 is restricted by engaging the rotation restricting portion 29b with the side plate 21c of the mounting case 21. As shown in FIG. Conduction promoting material 29 The protrusion 29c is held by the step portion 23d of the circular shaft portion 23a and the deformed shaft portion 23b to prevent the shape from being crushed. The protrusion 29c eliminates play and rattle of the conductivity promoting member 29, ensuring electrical contact with the hinge shaft 23. [Industrial Applicability]

[0043] By having the above-mentioned configuration, the present invention can provide a simple structure in which the mounting member and the support case, both of which are made of non-conductive materials, are rotatably connected via the hinge shaft, Device bodyThe hinge device can be suitably used as an office equipment hinge device capable of earthing the cover and the cabinet, and as an office equipment using this hinge device alone or in pairs. [Explanation of symbols]

[0044] 1 Office equipment 2 Hinge device 11 Device body 11a Mounting hole 12 Lid 13 Contact Glass 20 Frame members 20b side plate 20d female thread 20e connection hole 20f Friction part 21 Mounting case (mounting parts) 21i Storage Groove 22 Support member 22c Operating cam part 23 Hinge shaft 23a Circular shaft 23b Deformed shaft 23e Female thread 24 Slider 24b Sliding part 24c Pressure receiving cam part 24d Convex part 25 Elastic member 26 Electrode materials 27 Conductive Cord 28 Conductive materials 29 Conduction promoting materials 30 Earth connection circuit

Claims

1. A hinge device that connects a device body of an office machine and a cover body attached to the device body so as to be able to open and close, an upper-open mounting case that is detachably mounted in a mounting hole provided in the device body; a support member for supporting the lid, which is attached to the mounting case via a hinge shaft made of a conductive material so as to be able to open and close; a frame member, also made of a conductive material, housed in the mounting case and connected to the hinge shaft; a slider slidably accommodated in the mounting case; an elastic member elastically provided between the slider and the mounting case; an operating cam portion provided on the support member in pressure contact with a pressure-receiving cam portion provided on the top of the slider, a conductive cord electrically connected to the hinge shaft and to the lid; an electrode member provided on the outside of the bottom of the mounting case and connected to the frame member via a mounting screw made of a conductive material; A hinge device characterized in that the electrode member is in electrical contact with the device body when the mounting case is inserted into the mounting hole.

2. A pair of sliding portions that slide against the side plates of the frame member are provided on the side surfaces of the slider, A convex portion is provided in the sliding direction between the pair of sliding portions of the slider, 2. The hinge device according to claim 1, wherein an accommodation groove for accommodating the ridge portion of the slider and guiding it in the sliding direction is provided inside the mounting case.

3. 2. The hinge device according to claim 1, further comprising friction portions that are provided symmetrically inward from both side plates of the frame member and that press against and frictionally contact the side surfaces of the slider.

4. The hinge device according to claim 1, further comprising a conductivity promoting member that is sandwiched and held between one side plate of the frame member and the inner wall of the mounting case, through which the hinge shaft passes, and electrically bypasses the hinge shaft and the side plate.

5. 5. An office machine comprising a hinge device according to claim 1, wherein a cover is adapted to be opened and closed relative to a main body of the machine.

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