Opening / closing device, and office machine using the same

Abstract

To provide an opening / closing device that does not cause an opening / closing operation failure even after opening / closing operation or inverse operation over a long period of an opening / closing body, and can prevent generation of noise, and to provide an office machine using the opening / closing device.SOLUTION: An opening / closing device has: a second slider 32 that serves as a slide member; a first slider that serves as the slide member; and an elastic member storage part 32b that is composed of a compression coil spring resiliently provided between the second slider and the first slider, houses an end face of the compression coil spring in at least any of the first slider and second slider, and has a first inner diameter larger than an external diameter of the compression coil spring. A plurality of ribs 32c is provided that protrudes radially inward the elastic member storage part, and forms a second inner diameter smaller than the first inner diameter aligning the end face of the compression coil spring, and almost equal to the exterior diameter of the compression coil spring or larger than that.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to an opening and closing device suitable for use in office equipment such as copying machines, multifunction machines, and printing machines, and to office equipment using this opening and closing device. [Background technology]

[0002] Conventionally, a device body of an office machine such as a copier, multifunction device, printer, or facsimile machine has a door / opening body attached to the rear top surface of the device body via a pair of door / opening devices so as to be openable and closable. This door / opening device, also known as a document cover closer, is a type of hinge mechanism. One of the door / opening devices, as described in Patent Document 1 below, for example, includes a support member rotatably attached to a mounting member attached to the device body via a first hinge shaft, a lift member attached to the free end of the support member via a second hinge shaft so as to be rotatable in the opposite direction to the support member, a first slider slidably mounted inside the support member in contact with an actuating member attached to the lift member, and a second slider slidably mounted inside the support member in contact with a pressure-receiving member attached to the lift member, and an elastic member resiliently mounted between the first slider and the second slider, housed in an elastic member housing provided in each slider.

[0003] In an opening / closing device configured as described above, when the opening / closing body is opened or closed, the first and second sliders slide against the elastic force of the elastic member inside the support member. This sliding motion also occurs when a thick document, such as a book, is placed on the contact glass of the document table and the opening / closing body is closed to cover the top surface of the document. That is, it occurs when the opening / closing body is closed, its underside contacts the thick document, and further presses it downward. At this time, the lift member reverses and pushes the first slider via the actuating member, causing the first slider to slide inside the support member. A predetermined gap is provided between the outer peripheries of the first and second sliders and the inner wall of the elastic member housing to allow smooth compression and expansion of the elastic member. In such cases, when assembling the opening and closing device, the elastic member to be accommodated in the elastic member accommodating section is often assembled in a biased state to one side within the elastic member accommodating section. As a result, each slider rubs against the inner wall of the elastic member accommodating section when sliding, causing problems such as abnormal noises being generated when the opening and closing body is opened and closed, or an impaired operating feel during the opening and closing operation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-8038 A Summary of the Invention [Problem to be solved by the invention]

[0005] The above-mentioned conventional opening / closing devices are naturally shipped with lubricating grease applied to the sliding surfaces of the slider and support member, but over time the grease runs out, causing problems with the opening and closing operation of the opening / closing body and generating abnormal noise. This problem tends to become more apparent when the slider is press-fit tightly against the support member. The present invention has been made to solve these problems, and its purpose is to provide an opening / closing device and office equipment using this opening / closing device that do not cause opening / closing operation problems and prevent the generation of abnormal noise even after many years of opening / closing or reversing operations of the opening / closing body. [Means for solving the problem]

[0006] In order to achieve the above object, the opening and closing device according to claim 1 of the present application comprises a mounting member attached to the device main body side, a support member that supports the opening and closing body side and is rotatably attached to the mounting member via a hinge shaft, a slider that is housed inside the support member and is slidably in contact with a pressure-receiving member provided on the mounting member side, and an elastic member that is housed in an elastic member housing portion provided on the slider and is elastically attached between the free end side of the support member, and a predetermined gap is provided between the elastic member and the elastic member housing portion, and a positioning portion for the elastic member is provided on the base side of the elastic member housing portion.

[0007] Next, the opening and closing device according to claim 2 of the present application is the opening and closing device according to claim 1, Elastic member storage section The inner wall of the base side of the casing is characterized by being composed of a plurality of ribs, a plurality of arc-shaped convex portions, or a ring-shaped convex strip portion.

[0008] Next, the opening and closing device according to claim 3 of the present application is characterized in that the plurality of ribs, the plurality of arc-shaped convex portions, or the ring-shaped convex rib portion in claim 2 are provided with guide portions that are inclined toward the outside of the elastic member accommodating portion.

[0009] Next, the opening and closing device according to claim 4 of the present application comprises a mounting member attached to the device main body side, a support member rotatably attached to this mounting member via a first hinge shaft, a lift member rotatably attached to the free end side of this support member via a second hinge shaft, a first slider provided inside the support member so as to be slidable in contact with an operating member provided on the lift member side, a second slider facing the first slider and provided inside the support member so as to be slidable in contact with a pressure-receiving member provided on the mounting member side, and elastic members provided and accommodated in a first elastic member accommodating portion provided on the first slider and a second elastic member accommodating portion provided on the second slider, wherein a predetermined gap is provided between this elastic member and the first elastic member accommodating portion and the second elastic member accommodating portion, and wherein a first positioning portion and a second positioning portion for the elastic member are provided on the base sides of the first elastic member accommodating portion and the second elastic member accommodating portion, respectively.

[0010] Next, the opening and closing device according to claim 5 of the present application is characterized in that the first positioning portion and the second positioning portion in claim 4 are composed of a plurality of first ribs and second ribs provided on the inner walls of the first base side and the second base side of the first elastic member accommodating portion and the second elastic member accommodating portion, a plurality of first convex portions and second convex portions having an arc shape, or a first convex strip portion and a second convex portion having a ring shape.

[0011] Next, the opening and closing device according to claim 6 of the present application is characterized in that in claim 5, the plurality of first ribs and second ribs, the plurality of arc-shaped first convex portions and second convex portions, or the ring-shaped first convex streak portion and second convex streak portion are provided with guide portions that incline toward the outside of the first elastic member accommodating portion and second elastic member accommodating portion. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view schematically illustrating an opening and closing device according to the present invention. [Figure 2] 1 is a perspective view of an opening and closing device according to the present invention; [Figure 3] FIG. 2 is an exploded perspective view of the opening and closing device according to the present invention. [Figure 4] FIG. 2 is a perspective view of a first slider according to the present invention. [Figure 5] FIG. 2 is a plan view of a first slider according to the present invention. [Figure 6] FIG. 6 is a cross-sectional view taken along line AA in FIG. 5. [Figure 7] FIG. 2 is a perspective view of a second slider according to the present invention. [Figure 8] FIG. 2 is a plan view of a second slider according to the present invention. [Figure 9] FIG. 9 is a cross-sectional view taken along line BB in FIG. 8. [Figure 10] FIG. 3 is a cross-sectional view of a first slider according to the present invention with an elastic member attached thereto. [Figure 11] FIG. 10 is a cross-sectional view of a second slider according to the present invention with an elastic member attached thereto. [Figure 12] 3 is a cross-sectional view of the opening / closing device according to the present invention when the opening / closing body is closed. FIG. [Figure 13] 5A to 5C are cross-sectional views showing a process of opening the opening / closing body of the opening / closing device according to the present invention. [Figure 14] 1 is a cross-sectional view of an opening / closing body of an opening / closing device according to the present invention when opened. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an opening and closing device of the present invention will be described with reference to the accompanying drawings. [Example]

[0014] 1 shows a copier as an example of an office machine using an opening / closing device according to the present invention. As shown in the drawing, an opening / closing body C is attached to a main body a of the copier A according to the present invention via a pair of opening / closing devices B and B', allowing it to be opened and closed. The opening / closing devices B and B' enable the opening / closing body C to be opened and closed from a closed position in contact with the top surface of the main body a to a maximum open position for use. The opening / closing devices B and B' do not usually have the same configuration; the opening / closing device B on the left, which is equipped with an automatic document feed mechanism, is according to the present invention, while the opening / closing device B' on the right has a simpler configuration, so a description thereof will be omitted.

[0015] 2 to 14 are diagrams specifically illustrating an example of an opening / closing device B according to an embodiment of the present invention. As shown in the perspective view of FIG. 2, the opening / closing device of the present invention has a mounting member 4, a support member 5, and a lift member 6. The support member 5 houses sliding members, namely, a first slider 31 and a second slider 32, and an elastic member 21 made of a compression coil spring that biases the first slider 31 and the second slider 32 in directions separating them from each other. The mounting member 4 and the support member 5 are rotatably connected to each other by a first hinge shaft 11. The support member 5 and the lift member 6 are attached to the free end of the support member 5 by a second hinge shaft 12 so as to be rotatable in the opposite direction to the support member 5. An adjustment plate 71 housed in the mounting member 4 is provided to adjust the mounting position of the mounting member 4 relative to the device main body a.

[0016] In the exploded oblique view of Figure 3, the mounting member 4 is composed of a bottom plate 41 attached to the device main body a, side plates 42 extending from both side ends of the bottom plate 41 in a direction perpendicular to the bottom plate 41 (including a direction approximately perpendicular to the bottom plate 41), a substantially rectangular rear plate 43 extending from one end (rear end) of the bottom plate 41 in a direction perpendicular to the bottom plate 41 (including a direction approximately perpendicular to the bottom plate 41), and a curved recess 44 formed on one side of the side plate 42, and a stopper portion 48 is provided on the rear plate 43 side of the side plate 42.

[0017] The bottom plate 41 is formed in a substantially rectangular shape and has mounting holes 45 for mounting to the device main body a with screws or the like. and mounting holes 49a, 49b are provided. Both side plates 42 are formed in a roughly L-shape, and first hinge shaft holes 46 are provided at their tip ends (upper portions). Pin-shaped pressure-receiving member holes 47 are provided at positions closer to (below) the bottom plate 41 than the first hinge shaft holes 46 and offset inward (forward). A pressure-receiving member 13 is inserted through the pressure-receiving member holes 47. This pressure-receiving member 13 is pin-shaped, but is not limited to this. It may also be a cam-shaped member made of synthetic resin.

[0018] An adjustment plate 71 is provided on the bottom plate 41 of the mounting member 4 so as to be slidable relative to the adjustment plate 71. As shown in FIG. 12, an adjustment screw 74 is threadedly engaged with a substantially rectangular rear plate 75 extending from one end (rear end) of the adjustment plate 71 in a direction perpendicular to the adjustment plate 71 (including a direction substantially perpendicular to the adjustment plate 71). Mounting hole Reference numerals 72 and 73 denote mounting holes for attaching the adjustment plate 71 to the device main body a. The adjustment plate 71 is secured to the device main body a with mounting screws 81 and 82, sandwiching the bottom 41 of the mounting member 4. At this time, the screw tightening torque is set to such an extent that the mounting member 4 can move in the direction of arrow 76 relative to the adjustment plate 71 when the adjustment screw 74 is turned with a screwdriver or the like. The reference symbol 77 denotes a guide hole.

[0019] Then, the opening / closing body is attached to the opening / closing device, and with the opening / closing body closed relative to the device main body a, the adjustment screw 74 is turned until the relative positions are correct. Once it has been confirmed that the relative positions are correct, the screw tightening torque of the mounting holes 72 and 73 is increased, and the mounting member 4 and the device main body a are also screwed in place using button head screws 83 through the mounting holes 45 provided in the bottom plate 41 of the mounting member 4.

[0020] In the exploded perspective view of FIG. 3, the support member 5 includes an upper plate 51, and two side plates 52 extending perpendicularly from both side ends of the upper plate 51 in a direction perpendicular to the upper plate 51 (including a direction substantially perpendicular to the upper plate 51), Both side panels The tip of the clamping piece 52 is bent at an angle of 90 degrees to the opposite side, and the clamping piece 53 is formed by bending the tip of the clamping piece 52 at an angle of 90 degrees to the opposite side.

[0021] A second hinge shaft hole 55, through which the second hinge shaft 12 is inserted, is provided at one end (rear end) of each of the side plates 52 of the support member 5, and a notch 54 into which the operating member 14, described later, fits. A first hinge shaft insertion hole 56 is provided at the other end (front end) of each of the side plates 52. The first hinge shaft insertion hole 56 of each of the side plates 52 and the first hinge shaft hole 46 of the mounting member 4 are aligned with each other, and the first hinge shaft 11 is inserted into these holes, thereby connecting the support member 5 to the mounting member 4 so as to be rotatable about the first hinge shaft 11. The first hinge shaft 11 is inserted through the bearing portion of the bearing member 84, and is prevented from coming off by E-rings 86, which are provided on both ends of the first hinge shaft and engaged in circumferential grooves 11a via washers 85.

[0022] lift Materials The lift unit 6 is generally U-shaped and includes an upper plate 61 attached to the rear end of the opening / closing body C with screws or the like, and side plates 62 suspended from both ends of the upper plate 61 in a direction perpendicular to the upper plate 61 (including a direction approximately perpendicular to the upper plate 61), and is formed to cover the support member 5. Support plates 66 are bent at approximately right angles to the ends of the side plates 62 opposite the upper plate 61, and have multiple holes 67 formed in the support plates 66 that serve as screw connection holes for connecting the lift unit 6 to the opening / closing body C. A second hinge shaft insertion hole 63 is provided at one end (front end) of the lift unit 6 closer to the upper plate 61 than the center, and an actuating member hole 64, through which the actuating member 14 is inserted, is provided at the same side as the second hinge shaft insertion hole 63 but on the opposite side of the center from the upper plate 61. The actuating member 14 is inserted into the actuating member hole 64 of the side plates 62 and fixed there. The second hinge shaft insertion hole 63 of the side plates 62 of the lift member 6 and the second hinge shaft hole 55 of the side plates 52 of the support member 5 are aligned with each other, and the second hinge shaft 12 is inserted through these holes, thereby Materials The upper plate 61 is connected to the support member 5 so that it can rotate in the opposite direction to the rotation direction of the support member 5. The upper plate 61 is provided with a screw 65 for adjusting the parallelism between the support member 5 and the upper plate 51.

[0023] A pair of first and second sliders 31 and 32 are slidably housed within the support member 5. The pair of first and second sliders 31 and 32 is formed into a cylindrical shape with a rectangular cross section and a closed base. The first and second sliders 31 and 32 are held by respective holding pieces 53 within the support member 5 so that the openings of the first elastic member accommodating portion 31b and the second elastic member accommodating portion 32b face each other, thereby allowing the first and second sliders 31 and 32 to be individually housed and slidably mounted between the support member 5. A compression coil spring 21 is elastically mounted between the pair of first and second sliders 31 and 32, housed in the first elastic member accommodating portion 31b and the second elastic member accommodating portion 32b. In other words, the concave interiors of the first and second sliders 31 and 32 are formed as the first elastic member accommodating portion 31b and the second elastic member accommodating portion 32b that accommodate the compression coil spring 21. The compression coil spring 21 may be one or two or more, for example, two arranged in parallel or stacked, and biases the pair of first slider 31 and second slider 32 in directions separating them from each other.

[0024] 4 is a perspective view of the first slider 31, and the inner diameter 31k (FIG. 10) of the first elastic member accommodating portion 31b is set to be larger than the compression coil spring diameter 21a of the compression coil spring 21. The inner peripheral wall of the base side of the first elastic member accommodating portion 31b is provided with a plurality of No. 1 A first positioning portion D is provided, which is made up of a plurality of protrusions made up of ribs 31c, 31c, 31c... (the range of rib diameter 31d surrounded by dashed line 31e).

[0025] FIG. 5 is a plan view of the first slider 31, and shows eight elastic members arranged vertically along the inner circumferential wall of the first elastic member accommodating portion 31b. No. 1 Ribs 31c are provided at equal intervals. No. 1 The rib diameter 31d, which is the diameter of the narrowest circumference formed by the rib 31c, is set to be approximately equal to or slightly larger than the compression coil spring diameter 21a when the compression coil spring 21 is at its free length (intermediate tolerance). No. 1The position of the outer diameter of the compression coil spring is determined by providing equally spaced ribs that protrude vertically on the inner diameter side (towards the center) inside the elastic member accommodating portion 31b.

[0026] In the embodiment, the convex portions that make up the first positioning portion D and the second positioning portion D' (described later) are composed of a plurality of first ribs 31c, 31c, 31c... and second ribs 32c, 32c, 32c..., but are not limited to this and may be composed of a continuous ring-shaped portion having an inner diameter that matches the outer shape of the elastic member, or a plurality of arcuate portions. In this case, it is desirable to provide tapered guide portions toward the inlet sides of the first elastic member accommodating portion 31b and the second elastic member accommodating portion 32b in both cases to make it easier to insert the elastic member.

[0027] No. 1 The lattice-shaped beams 31f provided in the elastic member accommodating portion 31b are reinforcing beams to prevent the bottom portion 31h (FIG. 6) of the first slider 31 from being deformed even when the biasing force of the compression coil spring 21 is applied. FIG. 6 is a side cross-sectional view of the first slider 31 (cross-section AA in FIG. 5). No. 1 The elastic member accommodating portion 31b has an inner peripheral wall and a bottom portion 31h. No. 1 A rib 31c is provided. No. 1 The rib 31c has a plurality of No. 1 The diameter connecting the apexes of the rib 31c is No. 1 The elastic member accommodating portion 31b becomes larger toward the opening side, and finally No. 1 The tapered portion 31g is provided so as to have the same diameter as the opening of the elastic member accommodating portion 31b. No. 1 When the compression coil spring 21 is pressed into the elastic member accommodating portion 31b, the action of the tapered portions 31g, 31g, 31g... No. 1 The tapered portion 31g is positioned at the center of the elastic member accommodating portion 31b. That is, the tapered portion 31g serves as a guide when positioning the compression coil spring 21.

[0028] FIG. 10 shows the first slider 31 during assembly. No. 11 is a cross-sectional view of the elastic member accommodating portion 31b when the compression coil spring 21 is inserted into the elastic member accommodating portion 31b. No. 1 Since the first positioning portion D is provided by the ribs 31c, 31c, the compression coil spring 21 is No. 1 It is positioned in the center of the elastic member accommodating portion 31b, and the installation position can be prevented from shifting. No. 1 Since a gap 31j is provided in the elastic member accommodating portion 31b other than the location where the compression coil spring 21 is installed, the outer periphery of the compression coil spring 21 is in contact with the first slider 31. No. 1 There is no friction with the inner peripheral wall of the elastic member accommodating portion 31b.

[0029] FIG. 7 is a perspective view of the second slider 32. No. 2 The inner diameter 32k of the elastic member accommodating portion 32b is set to be sufficiently larger than the compression coil spring diameter 21a of the compression coil spring 21. No. 2 The inner peripheral wall of the elastic member accommodating portion 32b is provided with a plurality of No. 2 A second positioning portion D' (the range of the inner diameter 32d surrounded by the dashed line 32e in FIG. 8) consisting of ribs 32c, 32c, 32c . . . is provided.

[0030] FIG. 8 is a plan view of the second slider 32. No. 2 Eight locations are provided vertically along the inner peripheral wall of the elastic member accommodating portion 32b. No. 2 Ribs 32c, 32c, 32c... are provided at equal intervals. No. 2 The rib diameter 32d, which is the diameter of the narrowest circumference formed by the ribs 32c, 32c, 32c..., is set to a dimension (intermediate tolerance) that is approximately equal to the outer diameter of the compression coil spring 21 when it is in its free length, or a dimension slightly larger than that. No. 2 The elastic member accommodating portion 32b is provided with ribs that protrude vertically at regular intervals on the inner diameter side (towards the center) to form a compression coil spring. 21 The position of the outer diameter is determined. No. 2The lattice-shaped beams 32f provided in the elastic member accommodating portion 32b are reinforcing beams to prevent the bottom portion 32h (FIG. 9) of the second slider 32 from being deformed even when the biasing force of the compression coil spring 21 is applied. FIG. 9 is a side cross-sectional view (cross-section BB in FIG. 8) of the first slider 32. No. 2 At the corner defined by the inner peripheral wall of the elastic member accommodating portion 32b and the bottom portion 32h No. 2 A rib 32c is provided. No. 2 The rib 32c has a plurality of No. 2 The diameter connecting the apexes of the rib 32c is No. 2 The elastic member accommodating portion 32b becomes larger toward the opening side, and finally No. 2 A tapered portion 32g is provided so that the diameter of the tapered portion 32g is the same as the diameter of the opening of the elastic member accommodating portion 32b. No. 2 When the compression coil spring 21 is pressed into the elastic member accommodating portion 32b, the action of the tapered portion 32g No. 2 It is positioned at the center of the elastic member accommodating portion 32b.

[0031] FIG. 11 shows the second slider 32 during assembly. No. 2 1 is a cross-sectional view of the elastic member accommodating portion 32b when the compression coil spring 21 is inserted into the elastic member accommodating portion 32b. No. 2 Since the second positioning portion D' is provided by the rib portions 32c, 32c, ..., the compression coil spring 21 is No. 2 It is positioned in the center of the elastic member accommodating portion 32b, and the installation position can be prevented from shifting. No. 2 Since a gap 32j is provided in the elastic member accommodating portion 32b other than the location where the compression coil spring 21 is installed, the outer periphery of the compression coil spring 21 is in contact with the second slider 32. No. 2 There is no friction with the inner peripheral wall of the elastic member accommodating portion 32b.

[0032] The outer surface of the closed surface 31a, which is the bottom surface of the first slider 31 on the tip side, is formed into a flat surface. This closed surface 31a presses the operating member 14 with the biasing force of the compression coil spring 21, so that the support member 5 and the lift member 6 overlap. That is, the biasing force of the compression coil spring 21 causes the screw 65 provided on the upper plate 61 of the lift member 6 to abut against the upper plate 51 of the support member 5, so that the upper plate 51 of the support member 5 and the upper plate 61 of the lift member 6 are approximately parallel and close to each other.

[0033] A protrusion 33 is provided at approximately the center of the outer surface of the closed surface of the second slider 32 on the rear end side. (Figure 9). Furthermore, the protrusion 33 has a gradually inclined slope 34 formed on the side facing the holding piece 53. When the opening / closing body is closed, the protrusion 33 abuts against a fixed member, for example, the pressure-receiving member 13, and the lift member 6 rotates around the second hinge shaft 12. As a result, the portion of the pressure-receiving member 13 that abuts slides gradually from the protrusion 33 to the slope 34. Grease is normally applied to the outer periphery of this pressure-receiving member 13 for lubrication. An oil contamination prevention piece 38 is provided that protrudes forward from the lower side of the second slider 32 and covers the surface side of the pressure-receiving member 13.

[0034] When the opening / closing body C is in the closed state shown in FIG. 12 , the holding piece 53 of the support member 5 fits into the curved recess 44 of the mounting member 4, and the oil stain prevention piece 38 covers the periphery of the pressure-receiving member 13, particularly the side of the device main body a. This is to prevent grease applied to the pressure-receiving member 13 from adhering to the device main body a. From this state, if the opening / closing body C is held by the side opposite to the side where the opening / closing device B is attached and rotated about the first hinge shaft 11 in a direction away from the top surface of the device main body a (upward), as shown in FIG. 13 , the portion of the second slider 32 that abuts against the pressure-receiving member 13 gradually slides from the protrusion 33 to the inclined portion 34, and the second slider 32 is pressed by the compression coil spring 21 to slide within the support member 5 toward its rear end, gradually expanding the compression coil spring 21. When the opening / closing body C reaches the maximum open position relative to the top surface of the device main body a, as shown in FIG. 14 , the compression coil spring 21 reaches its maximum extension.

[0035] As mentioned above, the diameter 21a of the compression coil spring 21 and the diameters 31d and 32d of the ribs are set to be intermediately fitted when the compression coil spring 21 is at its free length. Even when the opening / closing body B is in the maximum usable open position relative to the top surface of the device main body a and the compression coil spring 21 is in its most extended state, the compression coil spring is still compressed from its free length, so the diameter 21a of the compression coil spring at the tip of the compression coil spring 21 is No. 1 Rib 31c, Second Rib Therefore, the compression coil spring 21 is firmly positioned relative to the first slider 31 and the second slider 32 by the first positioning portion D and the second positioning portion D', and it is possible to prevent the spring from shifting even after long-term use.

[0036] In this opening / closing device, by providing a positioning portion for positioning the compression coil spring 21 on at least one of the first slider 31 and the second slider 32, the compression coil spring 21 does not rub against the inner walls of the first elastic member accommodating portion 31b and the second elastic member accommodating portion 32b of the first slider 31 and the second slider 32, even when the opening / closing body C is repeatedly opened and closed during assembly and after long-term use after assembly, thereby preventing the generation of discomfort and abnormal noise during operation. In the embodiment, a slight gap is provided between the base of the compression coil spring 21 and the first positioning portion D and the second positioning portion D', but it is possible to configure the device without this gap. Such an embodiment is also within the scope of the present invention.

[0037] The opening and closing device B shown in the above embodiment is shown as having the lift member 6 attached to the free end of the support member 5 so as to be rotatable in the opposite direction to the support member 5, but the opening and closing device according to the present invention is not limited to this and can also be applied to a known configuration in which the lift member is omitted and the opening and closing body C is directly attached to the support member. In that case, the slider is a second slider 32The opening and closing device according to the present invention includes an opening and closing device having such a configuration. Therefore, the opening and closing device having this configuration is recited in claim 1 and its dependent claims. [Industrial Applicability]

[0038] As the present invention is configured as described above, it is possible to provide an opening and closing device that prevents malfunctions in the opening and closing operation of the opening and closing body and the generation of abnormal noises even after years of use, as well as office equipment that uses this opening and closing device. [Explanation of symbols]

[0039] A. Copying machine (office equipment) B. Switchgear C. Opening and closing body (original pressure plate) 4 Mounting parts 5 Support member 6 Lifting members 11 First hinge shaft 12 Second hinge shaft 13 Pressure-receiving member 14 Actuating member 21 Compression coil spring (elastic member) 21a compression coil spring diameter 31 First slider (sliding member) 31b No. 1 Elastic member accommodating section (compression coil spring elastic member accommodating section) 31c No. 1 rib 32 Second slider (sliding member) 32b No. 2 Elastic member accommodating section (compression coil spring elastic member accommodating section) 32c No. 2 rib 38 Oil stain prevention strip 41 Bottom plate 51 Upper board 52 Side boards 53 Holding piece

Claims

1. An opening and closing device comprising: a mounting member attached to the device main body; a support member supporting the opening and closing body which is rotatably attached to the mounting member via a hinge shaft; a slider which is slidably accommodated inside the support member in contact with a pressure-receiving member provided on the mounting member side; and an elastic member which is accommodated in an elastic member accommodating portion provided on the slider and is elastically attached between the support member and a free end side, wherein a predetermined gap is provided between the elastic member and the elastic member accommodating portion, and wherein a positioning portion for the elastic member is provided on the base side of the elastic member accommodating portion.

2. The opening and closing device according to claim 1, characterized in that the positioning portion is composed of a plurality of ribs, a plurality of arc-shaped convex portions, or a ring-shaped convex strip portion provided on an inner wall on the base side of the elastic member accommodating portion.

3. 3. The opening and closing device according to claim 2, characterized in that the plurality of ribs, the plurality of arc-shaped convex portions, or the ring-shaped convex strip portion are provided with guide portions inclined toward the outside of the elastic member accommodating portion.

4. an opening and closing device comprising: a mounting member attached to an apparatus main body side; a support member rotatably attached to the mounting member via a first hinge shaft; a lift member rotatably attached to a free end side of the support member via a second hinge shaft; a first slider provided inside the support member so as to be slidable in contact with an operating member provided on the lift member side; a second slider opposed to the first slider and provided inside the support member so as to be slidable in contact with a pressure-receiving member provided on the mounting member side; and an elastic member provided and accommodated in a first elastic member accommodating portion provided on the first slider and a second elastic member accommodating portion provided on the second slider, wherein a predetermined gap is provided between the elastic member and the first elastic member accommodating portion and the second elastic member accommodating portion, and wherein a first positioning portion and a second positioning portion are provided for the elastic member on the base side of the first elastic member accommodating portion and the second elastic member accommodating portion,

5. The opening and closing device described in claim 4, characterized in that the first positioning portion and the second positioning portion are composed of a plurality of first ribs and second ribs provided on each inner wall of the first base side and the second base side of the first elastic member accommodating portion and the second elastic member accommodating portion, a plurality of first convex portions and second convex portions having an arc shape, or the first convex streak portion and the second convex portion having the ring shape.

6. The opening and closing device as described in claim 5, characterized in that the plurality of first ribs and second ribs, the plurality of arc-shaped first convex portions and second convex portions, or the ring-shaped first convex streak portion and second convex streak portion are provided with guide portions inclined toward the outside of the first elastic member accommodating portion and the second elastic member accommodating portion.

7. An office machine using the opening and closing device according to any one of claims 1 to 6.

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