Opening / closing support device

Abstract

To provide an opening / closing support device which can prevent exposure of an elastic member and a pressure reception cam part regardless of the time of opening / closing and prevent dropping of oil and grease of the elastic member and the pressure reception cam part to a document or the like.SOLUTION: An opening / closing support device 10 which connects a device body 2 and a document crimping plate 3 in an office machine 1 having the document crimping plate 3 for opening / closing an upper surface of the device body 2, comprises: an attachment member 11 which is attached to the device body side; a support member 12 which is attached to the document crimping plate side; a pressure reception cam part 34; a first slider 14 which is provided in a slidable manner in the support member; a second slider 15 which is provided in a slidable manner in the support member; an elastic member 16 which is elastically provided between the first slider 14 and the second slider 15; and an oil contamination prevention plate 14c which can simultaneously cover the pressure reception cam part side and the elastic member side on the side of the first slider 14.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to an opening / closing support device, and more particularly to an opening / closing support device used in office equipment such as a copying machine having an original cover, which is more innovative than known devices. [Background technology]

[0002] Conventionally, in office equipment such as copiers, scanners, and printers, an original cover is used to press an original onto a contact glass and prevent external light from entering an exposure system inside the main body of the device. Various types of opening and closing support devices are known for opening and closing this original cover relative to the main body of the device.

[0003] Among these, the one described in Patent Document 1 below is known for preventing the document from becoming dirty with oil such as lubricant used in the opening and closing support device when the document is placed on the contact glass.

[0004] Furthermore, the conventional open / close support device uses an elastic member to prevent the original cover from dropping suddenly when closed and to support the original cover in the open state. However, it is not possible to prevent the original cover, which opens and closes when placing and removing an original on the contact glass, from dropping suddenly when closed or opening suddenly when opened. Therefore, a device using a friction mechanism to prevent this is known, as described in Patent Document 2 below.

[0005] The following Patent Document 1 describes a hinge equipped with an oil fence that is positioned near the outside of the contact portion between the cam member and the slide member and prevents foreign matter from entering the contact portion between the slide member and the cam member from the outside of the slide member and the cam member when the second wing member is in a state from the closed state to the open state. This hinge cannot prevent the oil in the pressure-receiving member from adhering to the document, cannot prevent the oil from leaking from both sides of the oil fence, and has problems such as the complication of the manufacturing process and increased costs because the oil fence is a separate part. Also, it cannot prevent the document cover from suddenly dropping when closed or opening suddenly when opened.

[0006] The following Patent Document 2 discloses a hinge including a first wing member, a cam member, a second wing member, a pressure-receiving member, a first slide member, a second slide member, and a spring member, in which the second slide member is formed with a plate-shaped cover portion extending toward the first slide member at a lower portion when the second wing member is in a closed state relative to the first wing member, and a hole portion into which one end of the spring member is inserted is formed on a surface of the second slide member facing the first slide member, and the rotation of the second slide member in the hole portion is controlled by a spring member. The hinge described herein is such that an insertion hole portion is formed near the axial direction of the axis so as to overlap with the hole portion when viewed in the axial direction of the pivot axis, and a protrusion portion protruding toward the second slide member is formed on the surface of the first slide member facing the second slide member, and when the second wing member is closed relative to the first wing member, the protrusion portion is inserted into the insertion hole portion of the second slide member, and when the second wing member is opened relative to the first wing member, the protrusion portion and the tip portion of the cover portion overlap. With this hinge, it is not possible to prevent the oil in the pressure-receiving member from adhering to the document, nor is it possible to prevent the oil from leaking from both sides of the cover portion. Furthermore, it is clear that there is a downward gap between the tip of the cover portion and the protrusion, which can lead to the problem that the oil or grease in the coil spring can fall through this gap onto the document below, etc.

[0007] As a result, it was found that by providing an oil stain prevention plate on the side of the first slider that can cover both the pressure-receiving cam portion and the elastic member side at the same time, it is possible to prevent the elastic member (coil spring) and pressure-receiving cam portion from being exposed whether the slider is open or closed, and to prevent the oil or grease on the elastic member (coil spring) and pressure-receiving cam portion from falling onto the original or the like underneath; that by further providing a cover portion that covers both sides of the second slider on the oil stain prevention plate, it is also possible to prevent oil from leaking from both sides of the oil stain prevention plate; and that by having a friction mechanism, it is possible to prevent the original pressing plate from falling rapidly when closed or opening suddenly when opened, and thus decided to file the present application. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2019-105775 A [Patent Document 2] Patent No. 6642885 Summary of the Invention [Problem to be solved by the invention]

[0009] The object of the present invention is to provide an opening / closing support device that can prevent the elastic member (coil spring) and the pressure-receiving cam portion from being exposed whether the device is open or closed, and can prevent the elastic member (coil spring) from falling onto the document or the like underneath the oil or grease. Another object of the present invention is to provide an opening / closing support device that can prevent the document pressing plate from suddenly dropping when closed, or suddenly opening when opened. [Means for solving the problem]

[0010] The present invention has the following configuration. (1) In an office machine having an original cover that opens and closes the top surface of a device body, an opening / closing support device that connects the device body and the original cover comprises: a mounting member having a mounting plate attached to the device body side and both side plates raised from both sides of the mounting plate; a support member that is attached to the original cover side, having a back plate and both side plates hanging down from both sides of the back plate, and having both side plates rotatably attached to the both side plates of the mounting member via hinge shafts; a pressure-receiving cam portion attached forward and below the position of the hinge shaft on both side plates of the mounting member; a first slider that is in contact with the pressure-receiving cam portion and slidably provided inside the support member; a second slider that is in contact with the free end side of the support member and slidably provided inside the support member; and an elastic member that is elastically provided between the first slider and the second slider, and characterized in that an oil stain prevention plate that can cover both the pressure-receiving cam portion side and the elastic member side at the same time is provided on the side of the first slider. (2) The opening / closing support device described in (1) further has a back plate on the free end side of the support member and both side plates hanging down from both sides of the back plate, and a lift member rotatably attached to the both side plates on the free end side of the support member via a second hinge shaft, and the second slider abuts against an operating member provided on the side of the second hinge shaft of the lift member. (3) The opening / closing support device described in (1), characterized in that the oil stain prevention plate is further provided with a cover portion that covers both sides of the second slider. (4) The opening / closing support device described in (1) has a friction mechanism on the back plate of the support member, the friction mechanism having a pair of long convex portions for friction spaced a predetermined distance apart, and a convex portion located on each tip side between the pair of long convex portions and shorter than the pair of long convex portions for friction, and each of the convex portions is pressed against the back of the first slider depending on the opening / closing angle when the original cover is opened or closed. Effect of the Invention

[0011] The opening / closing support device of the present invention has the configuration described in (1), and in particular, by providing an oil stain prevention plate on the side of the first slider that can cover both the pressure-receiving cam portion side and the elastic member side at the same time, it is possible to prevent the elastic member (coil spring) and the pressure-receiving cam portion from being exposed regardless of whether the device is open or closed, and to prevent the oil or grease on the elastic member (coil spring) and the pressure-receiving cam portion from falling onto documents or the like underneath.

[0012] The opening and closing support device of the present invention, having the configuration described in (2), can slide the second slider in conjunction with the movement of the lift member to which the original cover is attached.

[0013] The opening / closing support device of the present invention has the configuration described in (3), and therefore the two linear cover portions (ribs) can prevent oil or grease from leaking from the sides of the oil stain prevention plate.

[0014] The opening / closing support device of the present invention, having the configuration described in (4), can prevent the original cover from dropping suddenly when closed, or from opening suddenly when opened. [Brief description of the drawings]

[0015] [Figure 1] 1 is a perspective view showing an example of an office machine using an opening / closing support device of the present invention; [Diagram 2] FIG. 1 is a perspective view showing an example of an opening / closing support device of the present invention, illustrating an open state. [Diagram 3] FIG. 1 is a perspective view showing an example of an opening / closing support device of the present invention, illustrating a closed state. [Figure 4] 1 is a perspective exploded view showing an example of an opening / closing support device of the present invention; [Diagram 5] 1A to 1C are diagrams showing an example of a mounting member for an opening / closing support device of the present invention, in which (a) is a plan view, (b) is a front view, and (c) is a left side view. [Figure 6] 1A, 1B, and 1C are diagrams showing an example of a support member of an opening / closing support device of the present invention, in which (a) is a front view, (b) is a bottom view, and (c) is a left side view. [Figure 7]1A to 1C are diagrams showing an example of a first slider of an opening / closing support device of the present invention, in which (a) is a plan view, (b) is a front view, and (c) is a cross-sectional view taken along line AA. [Figure 8] 1A to 1C are diagrams showing an example of a second slider of an opening / closing support device of the present invention, in which (a) is a plan view, (b) is a perspective view, and (c) is a cross-sectional view taken along line BB. [Figure 9] FIG. 2 is a front view showing an example of the opening / closing support device of the present invention, illustrating a closed state. [Figure 10] FIG. 2 is a cross-sectional view taken along line CC showing an example of an opening / closing support device of the present invention, illustrating a closed state. [Figure 11] FIG. 2 is a cross-sectional view taken along line CC showing an example of an opening / closing support device of the present invention, illustrating an open state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An opening / closing support device according to a preferred embodiment of the present invention and an office machine equipped with this opening / closing support device will be described below with reference to the drawings. In the following description, the front-rear, left-right, and up-down directions shown in the Cartesian coordinate system in FIG. 1 will be referred to as appropriate. In the present invention, the office equipment includes copying machines such as copying machines and multifunction machines, printing machines, facsimiles, scanners, etc., but is not limited to these.

[0017] (Embodiment 1) In FIG. 1, the reference numeral 1 denotes a copying machine, which is an example of an office machine. Other examples of office machines include multifunction machines, printing machines, etc. machine, Examples of such devices include fax machines and scanners. Office equipment 1 is abbreviated cubeThe document presser has a shaped device main body 2, a contact glass 4 on the top surface 2a of the device main body 2, an operation unit 5 at the lower right of the top surface 2a, and an original cover 3 for opening and closing the top surface 2a of the device main body 2. There are two types of original cover 3: one with an automatic document feeder and one without, which is lightweight. In this embodiment, the one with an automatic document feeder is shown. In the one with the automatic document feeder, the left side is heavier, so the opening / closing support device on the left side and the opening / closing support device on the right side usually have different configurations. In this embodiment, the one designated by reference numeral 10, which is attached to the left side which is heavier, will be described. The opening / closing support device designated by reference numeral 10A will not be described. An original cover 3 is attached to the opening / closing support devices 10 and 10A so as to be openable and closable, and in Fig. 1, the original cover 3 is in an open state. Note that the closed state refers to a state in which the lower surface 3a of the original cover 3 is in contact with the upper surface 2a of the device body 2.

[0018] As shown in Figures 2 to 4 and 9 to 11, the opening / closing support device 10 of the present invention has an attachment member 11, a support member 12, a lift member 13, a first slider 14, a second slider 15, an elastic member (coil spring) 16, a damper 17, a hinge shaft 21, a second hinge shaft 22, an operating member 31, a pressure-receiving cam portion 34, and a second elastic member (coil spring) 36.

[0019] "Mounting parts" As shown in FIG. 5, the mounting member 11 is composed of a mounting plate (bottom plate) 11a that is attached to the device main body 2, a pair of side plates 11b, 11b that rise upward from both side ends of the mounting plate (bottom plate) 11a, and a substantially rectangular rear plate 11c that extends from one end (rear end) of the mounting plate (bottom plate) 11a in a direction perpendicular to the mounting plate (bottom plate) 11a. The mounting plate (bottom plate) 11a is formed in a roughly rectangular shape when viewed from above, and has a flat keyhole-shaped mounting hole 11g through which the mounting screw 40 (see Figure 10) is inserted and engaged, and a mounting hole 11f through which the mounting screw 40 (see Figure 10) is attached, and is attached to the upper rear end of the device main body 2 by the mounting screw 40. The mounting member 11 is formed by bending a single metal plate that has been processed into a predetermined shape.

[0020] Holes 11d, 11e are provided in the pair of side plates 11b, 11b of the mounting member 11, and a hinge shaft 21 and a pressure-receiving cam portion 34 are attached to the holes 11d in the upper rear portion of the mounting member 11. The mounting member 11 rotatably supports the support member 12 via the hinge shaft 21. In this manner, the mounting member 11 has a mounting plate (bottom plate) 11a attached to the device body side and both side plates 11b, 11b standing up from both sides of the mounting plate (bottom plate) 11a.

[0021] The pressure-receiving cam portion 34 has a pressure-receiving shaft 33 and a roller member 32 through which the pressure-receiving shaft 33 is detachably inserted. The pressure-receiving shaft 33 is a rod-shaped member having a circular cross section, and is inserted into an insertion hole 11e formed in the pair of side plates 11b, 11b. In FIG. 5, reference symbols 11h and 11j indicate holes, and reference symbols 11i and 11k indicate protrusions.

[0022] The roller member 32 is formed in a cylindrical shape having a circular cavity 32a in the longitudinal direction. The inner diameter of the cavity 32a is larger than the outer diameter of the pressure-receiving shaft 33, and the outer diameter of the roller member 32 is larger than the hole diameter of the insertion hole 11e. The length of the roller member 32 is smaller than the distance between the inner surfaces of the pair of side plates 11b, 11b. When the mounting member 11 is assembled, the roller member 32 formed with such dimensions is first placed between the pair of side plates 11b, 11b so that the position of the cavity 32a coincides with the insertion holes 11e, 11e. Then, the pressure-receiving shaft 33 is inserted into the insertion holes 11e, 11e and the cavity 32a. As a result, the roller member 32 is rotatably supported by the pressure-receiving shaft 33 that penetrates through it.

[0023] "Support member" As shown in FIG. 6, the support member 12 is composed of a back plate (upper plate) 12a, a pair of side plates 12b, 12b that hang down from both side ends of the back plate (upper plate) 12a in a direction perpendicular to the back plate (upper plate) 12a, and holding pieces 12c, 12c that are bent inward from the lower ends of the pair of side plates 12b, 12b. As a result, an accommodation space 12f for accommodating various parts is formed inside the support member 12. The pair of side plates 12b, 12b of the support member 12 are provided with holes 12d, and the rear parts of the pair of side plates 12b, 12b are attached to the pair of side plates 11b, 11b of the attachment member 11 via hinge shafts 21. As a result, the support member 12 is rotatably supported by the attachment member 11. Two long linear protruding portions 12e and one short linear protruding portion 12k are provided on the inner surface of the back plate (upper plate) 12a. Further, as suggested in Figures 3, 4 and 6, designations 12g, 12h, 12i, and 12j are holes. In this way, the back plate 12a and this back plate 12a The side plates 12b, 12b are hung down from both sides of the mounting member 11, and the side plates 12b, 12b are rotatably connected to the side plates 11b, 11b of the mounting member 11 via hinge shafts 21. Nihara Paper pressure bonding board 3 It has a support member 12 attached to its side.

[0024] "Lifting components" The lift member 13 is formed by bending a single metal plate that has been machined into a predetermined shape. The lift member 13 is composed of a back plate (upper plate) 13a, a pair of side plates 13b, 13b hanging downward from both sides of the back plate (upper plate) 13a, and mounting plates 13c, 13c bent outward from the lower ends of the pair of side plates 13b, 13b. The lift member 13 has a hole 13d formed in the pair of side plates 13b, 13b, and the pair of side plates 13b, 13b are attached to the free end side (front side) of the pair of side plates 12b, 12b of the support member 12 via the second hinge shaft 22 and an E-ring 42. In contrast It is rotatably supported. The lift member 13 has holes 13f formed in the pair of side plates 13b, 13b, and an operating member 31 is attached to the holes 13f. The support member 12 rotates clockwise around the hinge shaft 21 from the closed state. On the other hand, the lift member 13 rotates counterclockwise around the second hinge shaft 22 from the closed state. In this way, the lift member 13 is attached to be rotatable in the opposite direction to the support member 12. The lift member 13 is a pair of Mounting plate A hole 13e is provided in the mounting plates 13c, 13c, and the rear part of the original cover 3 is attached to the mounting plates 13c, 13c.

[0025] Height adjustment means The lift member 13 is provided with a height adjustment screw constituting the height adjustment means 7 of the original cover 3. 48 and nuts 47 is attached to a female screw portion 46 provided on the back plate (upper plate) 13a. height Adjustment screw 48 The tip of the support member 12 is in contact with the back plate (upper plate) 12a of the support member 12.

[0026] The lift member 13 further includes an actuating member 31 that passes through the pair of side plates 13b, 13b in the left-right direction. The actuating member 31 is a rod-shaped member with a circular cross section, and is located adjacent to the second hinge shaft 22. 、 The support members 13a and 13b are provided at the front of the pair of side plates 13b.

[0027] A pair of first slider 14 and second slider 15 held by holding pieces 12c, 12c are slidably accommodated in the accommodation space 12f of the support member 12. Between the opposing first slider 14 and second slider 15, , bullets A spring member (coil spring) 16 is provided. Bullet One end of the spring member (coil spring) 16 is accommodated in the first spring accommodating portion 14b of the first slider 14. , bullets The other end of the spring member (coil spring) 16 is accommodated in the second spring accommodating portion 15b of the second slider 15. One end side top surface 14k of the first slider 14 is formed as a cam portion, and is in pressure contact with a roller member 32 of a pressure-receiving cam portion 34 provided between the pair of side plates 11b, 11b of the mounting member 11. In particular, reference symbols 52 and 53 in FIG. 4 indicate a ring-shaped member and a disk member. Further, the other end side top surface 15e of the second slider 15 is in pressure contact with the operating member 31 attached to the second hinge shaft 22 side (front side) of the support member 12. In this manner, the mounting member 11 has pressure-receiving cam portions 34 attached forward and below the position of the hinge shaft 21 on both side plates.

[0028] "First slider" As shown in FIG. 7, the first slider 14 is accommodated in the accommodation space 12f of the support member 12 on the hinge shaft 21 side. The first slider 14 includes a first spring receiving portion 14a and an oil stain prevention plate 14c. The oil stain prevention plate 14c is integrated with one side of the first spring receiving portion 14a, extends from the first spring receiving portion 14a side to the second hinge shaft 22 side, and has a tip portion 14h extending toward the second hinge shaft 22 side, and extends from the first spring receiving portion 14a side to the hinge shaft 21 side, and has a rear end portion 14i extending toward the hinge shaft 21 side. The first spring receiving portion 14a is provided with a first spring housing portion 14b and two notches 14j. One end of an elastic member (coil spring) 16 is fitted into the first spring housing portion 14b, and a protrusion 15c of the second slider 15 is fitted into the notch 14j in the closed state. The oil stain prevention plate 14c has a front surface 14f and a back surface 14g. Six linear ribs 14d that protrude vertically and run parallel to each other at equal intervals are formed on the front surface 14f, and two linear cover portions (ribs) 14e that protrude vertically and run along the edge of the oil stain prevention plate 14c are formed on the back surface 14g. By providing the six linear ribs 14d, the horizontality of the oil stain prevention plate 14c can be ensured, and the movement of the moving mechanism can be ensured. The two linear cover portions (ribs) 14e can prevent oil or grease from leaking from the sides of the oil stain prevention plate 14c. 。 No. One end side top surface 14k of first spring receiving portion 14a is formed as a cam portion, and is brought into pressure contact with pressure receiving cam portion . The upper surface of the first spring receiving portion 14a is defined as a back portion 14m. In this way, the oil stain prevention plate 14c capable of simultaneously covering the pressure-receiving cam portion side and the elastic member side is provided on the side of the first slider 14. Also, the first slider 14 is provided in contact with the pressure-receiving cam portion 34 so as to be slidable inside the support member.

[0029] "Second slider" As shown in FIG. 8, the second slider 15 is accommodated in the accommodation space 12f of the support member 12 on the second hinge shaft 22 side. The second slider 15 has a second spring receiving portion 15a, which is provided with a second spring accommodating portion 15b and two protruding portions 15c. The other end side 16b of the elastic member (coil spring) 16 is fitted into the second spring accommodating portion 15b, and the protruding portion 15c is fitted into the notch portion 14j of the first slider 14 in the closed state. The other end side top surface 15e of the second slider 15 is in pressure contact with the operating member 31 attached to the second hinge shaft 22 side (front side) of the support member 12. In this manner, the second slider 15 is provided in contact with the free end side of the support member 12 so as to be slidable inside the support member.

[0030] "Elastic material (coil spring)" Elastic member (coil spring) 16 has one end 16a fitted in first spring accommodating portion 14b of first spring receiving portion 14a, and the other end 16b fitted in second spring accommodating portion 15b of second spring receiving portion 15a. 4, 10, and 11, in this embodiment, a left-handed second elastic member (coil spring) 36 is also inserted between the right-handed elastic member (coil spring) 16 and the damper 17 from the second slider 15 toward the first slider 14. It is preferable to reverse the winding directions of the elastic member (coil spring) 16 and the second elastic member (coil spring) 36. This allows for more precise adjustment of the elastic force. The elastic member (coil spring) 16 may be wound left-handed, and the second elastic member (coil spring) 36 may be wound right-handed. If adjustment of the elastic force is not required to a great extent, the second elastic member (coil spring) 36 may be omitted. In this manner, the elastic member 16 is provided between the first slider 14 and the second slider 15 .

[0031] "Damper" The damper 17 is coaxially disposed within the spiral of a second elastic member (coil spring) 36 which is coaxially disposed within the spiral of the elastic member (coil spring) 16.

[0032] "Operating member, pressure-receiving cam portion" The actuating member 31 is attached to the lift member 13 . The pressure-receiving cam portion 34 is made up of a pressure-receiving shaft 33 serving as an axis and a roller member 32 , and is attached to the attachment member 11 . When the closed state is changed to the open state, the operating member 31 moves to the second slider. 15 The pressure-receiving cam portion 34 presses the other end top surface 15e of the first slider 14, and the pressure-receiving cam portion 34 receives the pressure at the one end top surface 14k of the first slider 14. Opening and closing support device 10 further has a back plate 13a on the free end side of the support member 12 and both side plates 13b, 13b hanging down from both sides of the back plate 13a, and has a lift member 13 in which both side plates 13b, 13b are rotatably attached to both side plates 12b, 12b on the free end side of the support member 12 via a second hinge shaft 22, and the second slider 15 abuts against an operating member 31 provided on the side of the second hinge shaft 22 of the lift member 13.

[0033] "A mechanism that can simultaneously cover the pressure-receiving cam portion side and the elastic member side on the first slider side" As shown in FIGS. 10 and 11, when the original cover 3 is changed from the closed state to the open state, the second slider 15 moves in a direction away from the first slider 14. Whether in the closed state or the open state, when viewed from a direction perpendicular to the surface 14f of the oil stain prevention plate 14c, the tip side portion 14h of the oil stain prevention plate 14c extending toward the second hinge shaft 22 covers the open tip portion 15d of the second slider 15. This prevents the elastic member (coil spring) 16 from being exposed whether in the open state or the closed state, and covers the elastic member (coil spring) so as to scoop up any oil or grease from the elastic member (coil spring) that falls onto the document or the like underneath, thereby preventing the oil or grease from the elastic member (coil spring) 16 from falling onto the document or the like. In addition, the rear end portion 14i of the oil stain prevention plate 14c extending toward the hinge shaft 21 covers the axis center O of the pressure receiving cam portion 34. This prevents the pressure receiving cam portion 34 from being exposed regardless of whether the door is open or closed. 34 This prevents oil or grease from falling onto documents, etc. In other words, the mechanism that can cover both the pressure-receiving cam portion side and the elastic member side on the first slider side simultaneously prevents the elastic member (coil spring) and pressure-receiving cam portion from being exposed whether the slider is open or closed, and prevents the elastic member (coil spring) and pressure-receiving cam portion from falling onto documents or other items underneath the oil or grease.

[0034] "Friction mechanism" The back plate 12a of the support member 12 has a friction mechanism, which has a pair of long convex portions 12e for friction spaced a predetermined distance apart, and convex portions 12k located on each tip side between the pair of long convex portions 12e and shorter than the pair of long convex portions 12e for friction, and each convex portion is pressed against the back portion 14m of the first slider 14 depending on the opening and closing angle when the original cover 3 is opened or closed. The two long convex portions 12e and the short convex portion 12k are pressed against the three concave portions 14l of the back portion 14m of the first slider 14, generating friction. The friction mechanism can prevent the original cover from dropping suddenly when closed or from opening suddenly when opened. [Industrial Applicability]

[0035] The opening / closing support device of the present invention is provided with an oil stain prevention plate on the side of the first slider that can cover both the pressure-receiving cam portion and the elastic member side at the same time, thereby preventing the elastic member (coil spring) and pressure-receiving cam portion from being exposed whether the device is open or closed, and preventing the oil or grease on the elastic member (coil spring) and pressure-receiving cam portion from falling onto the original or the like underneath. A part of the oil stain prevention plate is provided with cover portions on both sides that cover both sides of the second slider, thereby preventing oil from leaking from both sides of the oil stain prevention plate. The friction mechanism prevents the original pressure plate from falling rapidly when closed or opening suddenly when opened, so the device can be expected to be used as an opening / closing support device for office equipment equipped with a contact glass for reading originals. [Explanation of symbols]

[0036] 1 office equipment 2. Device body 2a Top side 3 Original pressure plate 3a Lower surface 4. Contact Glass 5 Control section 7 Height adjustment means 10 Opening and closing support device 10A Opening and closing support device 11 Mounting material 11a Mounting plate (bottom plate) 11b Side plate 11c rear plate 11d Hole 11e Hole 11f Mounting hole 11g Mounting hole 11h Hole 11i Convex part 11j Hole 11k convex part 12 Support member 12a Backboard (upper board) 12b Side plate 12c holding piece 12d hole 12e long Convex part 12th floor storage space 12g hole 12h hole 12i hole 12j Hole 12k short Convex Department 1 3 Lifting materials 13a Backboard (upper board) 13b Side plate 13c Mounting plate 13d hole 13e Hole 13f hole 14 First Slider 14a First spring bearing part 14b First spring housing 14c Oil stain prevention plate 14d Rib 14e Cover part (rib) 14f surface 14g back side 14h Tip side part 14i rear end part 14j Notch 14k One end side top surface 14l Recess 14m back 15 Second Slider 15a Second spring bearing part 15b Second spring housing 15c protrusion 15d Opening tip 15e Other end side top surface 16 Elastic member (coil spring) 16a One end side 16b Other end side 17 Damper 21 Hinge shaft 22 Second hinge shaft 31 Actuating member 32 Roller member 32a cavity 33 Pressure shaft 34 Pressure receiving cam part 36 Second elastic member (coil spring) 40 Mounting screw 46 Female thread 47 nut 48 Height adjustment screw 50 Ring-shaped member 51 Ring-shaped member 52 Ring-shaped member 53 Disc member O axis center

Claims

1. In an office machine having an original cover that opens and closes the top surface of a main body of the machine, there is provided an opening and closing support device that connects the main body of the machine and the original cover, a mounting member having a mounting plate attached to the device body side and side plates extending from both sides of the mounting plate; a support member attached to the original cover side, the support member having a back plate and side plates hanging down from both sides of the back plate, the side plates being rotatably attached to the side plates of the attachment member via hinge shafts; a pressure-receiving cam portion attached to each of the side plates of the mounting member forward and below the position of the hinge shaft; a first slider that is slidably provided inside the support member in contact with the pressure-receiving cam portion; a second slider that is in contact with the free end side of the support member and is slidably provided inside the support member; an elastic member elastically disposed between the first slider and the second slider, An opening / closing support device characterized in that an oil stain prevention plate capable of covering the pressure-receiving cam portion side and the elastic member side at the same time is provided on the side of the first slider.

2. The opening / closing support device described in claim 1 further has a back plate on the free end side of the support member and side plates hanging down from both sides of the back plate, and has a lift member rotatably attached to the side plates on the free end side of the support member via a second hinge shaft, and the second slider abuts against an operating member provided on the side of the second hinge shaft of the lift member.

3. The opening / closing support device according to claim 1 , wherein the oil stain prevention plate is further provided with cover portions for covering both sides of the second slider.

4. 2. The opening / closing support device according to claim 1, characterized in that the back plate of the support member has a friction mechanism, which has a pair of long convex portions for friction spaced apart at a predetermined distance, and a convex portion located at each tip end between the pair of long convex portions and shorter than the pair of long convex portions for friction, and each of the convex portions presses against the back of the first slider depending on the opening / closing angle when the document cover is opened or closed.

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