Original document pressing plate opening / closing device and office equipment equipped with this original document pressing plate opening / closing device

Abstract

To provide an original crimping plate opening / closing device capable of preventing contamination with lubricating oil on an end part of a document and adhesion of a floating matter into the document crimping plate opening / closing device, and a terminal device using the document crimping plate opening / closing device.SOLUTION: A document crimping plate opening / closing device 1A has: a mounting member 4; a support member 5 rotatably and pivotally supported via a first hinge shaft 11; a lift member 6 attached to a document crimping plate rotatably and pivotally supported in the opposite direction to the support member via a second hinge shaft 12; a cam slider 32 provided in contact with a pressure receiving member 13; an actuation slider 31 provided in contact with an actuation member 14; and an elastic member 21 elastically installed between the cam slider and the actuation slider. The document crimping plate opening / closing device is provided with: a first fire spread prevention cover C1 having one end side attached to the support member, covering the front side of the second hinge shaft, the actuation member and the support member, and having the other end side attached to the other end side of the support member; and a second fire spread prevention cover C2 attached to the cam slider, and wrapping around and covering the pressure receiving member.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a document pressing plate opening / closing device provided in office equipment such as copiers, multifunction devices, printers, facsimiles, scanners, etc., and office equipment equipped with this document pressing plate opening / closing device.

Background Art

[0002] In the apparatus main body of office equipment such as copiers, printers, facsimiles, scanners, etc., a document pressing plate that covers the document placement surface provided on the upper surface of the apparatus main body is attached via an opening / closing device so as to be openable and closable. This opening / closing device is called a document pressing plate opening / closing device, and is configured to be able to press a document against the document placement surface and prevent external light from entering the apparatus main body and interfering with normal copying.

[0003] Among such document pressing plate opening / closing devices, there is a known device provided with a fire spread prevention cover so that, for example, the end of a document placed on the document placement table is not soiled by lubricating oil such as grease applied to a pressure receiving member provided on the attachment member side, as described in Patent Document 1 below. However, since it does not sufficiently cover the internal mechanism of the document pressing plate opening / closing device (such as a slider, an elastic member, a pressure receiving member in contact with the slider, an operating member, etc.), for example, when a fire breaks out from the peripheral electronic equipment of the document pressing plate opening / closing device, there is a problem that the internal mechanism is exposed to the flame and the fire spreads.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention has been made to solve the above problems, and an object thereof is to provide a fire spread prevention cover that can almost completely cover the internal mechanism of a document pressing plate opening / closing device, so as to prevent the internal mechanism from being exposed to flames when a fire breaks out from surrounding electronic devices, and to provide such a document pressing plate opening / closing device. At the same time, it is also an object to provide a document pressing plate opening / closing device that almost completely covers the front side of the internal mechanism where parts coated with lubricating oil or rust preventive oil are exposed by the fire spread prevention cover, and can almost surely prevent the ends of the documents placed on the document placement table from being soiled by the lubricating oil or rust preventive oil, and an office machine equipped with such a document pressing plate opening / closing device.

Means for Solving the Problems

[0006] In order to achieve the above object, the document pressing plate opening / closing device according to claim 1 of the present application includes a mounting member attached to the device body side of an office machine having a document pressing plate, a support member rotatably supported on the mounting member via a first hinge shaft, a lift member attached to the document pressing plate that overlaps the support member and is rotatably supported on the free end side of the support member via a second hinge shaft in a direction opposite to that of the support member, a cam slider provided inside the support member in contact with a pressure receiving member attached to the mounting member, and an operation slider provided in contact with an operation member provided on the lift member, and an elastic member elastically provided between the cam slider and the operation slider. In the document pressing plate opening / closing device, a first fire spread prevention cover having one end side attached to the support member, covering the second hinge shaft, the operation member, and the front side of the support member, and having the other end side attached to the other end side of the support member, and a second fire spread prevention cover attached to the cam slider and covering the pressure receiving member by wrapping around it are provided.

[0007] In order to achieve the above object, the document pressing plate opening / closing device according to claim 2 of the present application is characterized in that a locking piece provided on one end side of the first fire spread prevention cover is inserted and locked into a locking hole provided on the back plate of the support member, and the other end side is fixed to both side plates of the support member.

[0008] In order to achieve the above object, the document pressing plate opening / closing device according to claim 3 of the present application is characterized in that one end side of the second fire spread prevention cover is fixed to the cam slider, and the other end side is curved so as to have a length capable of covering the pressure receiving member even when the document pressing plate attached to the lift member is opened.

[0009] In order to achieve the above object, the document pressing plate opening / closing device according to claim 4 of the present application is characterized in that the cam slider is provided with a recess for attaching the second fire spread prevention cover.

[0010] In order to achieve the above object, the document pressing plate opening / closing device according to claim 5 of the present application is characterized in that the first fire spread prevention cover is provided with a recess for allowing a part of the second fire spread prevention cover to pass through.

[0011] In order to achieve the above object, the document pressing plate opening / closing device according to claim 6 of the present application is characterized in that an office device uses the document pressing plate opening / closing device described above.

Advantages of the Invention

[0012] Since the present invention is configured as described above, the front side where the internal mechanism of the document pressing plate opening / closing device is exposed can be almost completely covered by the first fire spread prevention cover and the second fire spread prevention cover. Therefore, even if ignition occurs from peripheral electronic components, the internal mechanism will not be exposed to the flame, so that fire spread can be prevented as much as possible. Further, the first fire spread prevention cover and the second fire spread prevention cover can almost completely cover the front portion of the document pressing plate opening / closing device on which the ends of the documents placed and removed on the document placement table are Lubricating oil and Rust preventive oil are applied. Thus, it is possible to almost surely prevent the documents from being soiled by lubricating oil or rust preventive oil. Furthermore, it is possible to prevent dust and other floating substances floating in the air from adhering to the document pressing plate opening / closing device.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 6

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Figure 8

Figure 9

Figure 10

Figure 11

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Figure 14

Figure 15

Embodiment for Carrying Out the Invention

[0014] Hereinafter, the original pressing plate opening / closing device of the present invention and this original pressing plate opening / closing device equipped with will be described in detail based on the drawings attached with examples of office equipment.

Example

[0015] Figs. 1 to 15 show preferred embodiments of the original pressing plate opening / closing device according to the present invention and this original pressing plate opening / closing device equipped with as an example of office equipment. According to the drawings, the original pressing plate opening / closing devices 1A and 1B of the present invention are a kind of hinge device for attachably and detachably mounting an original pressing plate 3 to the upper surface of a device body 2B of office equipment such as a copying machine, a printer, a facsimile machine, and a scanner, although they differ in size.

[0016] The original pressing plate opening / closing device according to the present invention is composed of a large one 1A on the left side and a small one 1B on the right side as shown in Fig. 1. left side For the one 1A, a double coil spring or an oil damper is used. right side The small one 1B uses a single coil spring or has no coil spring. Or an oil damper may be used with this single coil spring. This is because, due to the relationship that an automatic document feeder is provided on one side of the original pressing plate 3, a load is unevenly applied to the original pressing plate opening / closing device 1A in the drawing. left side As shown in the drawing, a first fire spread prevention cover C1 and a second fire spread prevention cover C2 according to the present invention are attached to both. Even if they differ in size, their configurations are the same. Hereinafter, the large original pressing plate opening / closing device with the reference symbol 1A will be described. However, the left and right original pressing plate opening / closing devices 1A and 1B may have the same size and the same configuration even though they are different in size in the example.

[0017] The original document pressing plate opening / closing device 1A according to the present invention includes a mounting member 4 attached to the upper rear end of the device body 2B of the copying machine 2A, a support member 5 rotatably connected to both side plates 42, 42 of the mounting member 4 via a first hinge shaft 11, and a support member 5 rotatably connected to both side plates 52, 52 on the free end side of the support member 5 via a second hinge shaft 12 in a direction different from that of the support member 5. A lift member 6 for attaching the original document pressing plate 3 is provided. Inside the support member 5, there is a cam slider 32 in contact with a pressure receiving member 13 provided on the mounting member 4, an operating slider 31 provided in contact with an operating member 14 provided on the lift member 6, and an elastic member 21 composed of a compression coil spring elastically provided between the operating slider 31 and the cam slider 32. In particular, as shown in FIGS. 2 and 12 to 15, a first fire spread prevention cover C1 and a second fire spread prevention cover C2 are installed on the front side of the original document pressing plate opening / closing device 1A. Further, a finger pinching prevention cover 7A is attached to the rear side of the lift member 6 and the support member 5. Note that although the first hinge shaft 11 and the second hinge shaft 12 are shown as one in the drawing, they may be divided into two and axially attached to both side plates 42, 42 of the mounting member 4 and both side plates 52, 52 of the support member 5, and both side plates 52, 52 of the support member 5 and both side plates 62, 62 of the lift member 6 separately. In the present invention, when referring to the first hinge shaft 11 and the second hinge shaft 12, those including these are meant. Note that in particular, in FIG. 4, the reference signs 11a, 11a denote bearing members, and the reference signs 11b, 11b denote washers.

[0018] As shown in FIGS. 4 and 10, the mounting member 4 includes a bottom plate 41 attached to the upper rear end side of the device body 2B, both side plates 42, 42 extending from both side ends of the bottom plate 41 in a direction perpendicular to the bottom plate 41 (including a substantially perpendicular direction), and 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 substantially perpendicular direction).

[0019] The bottom plate 41 is formed in a substantially rectangular shape, and is provided with large and small mounting holes 41a and 41b for mounting to the apparatus main body 2B with mounting bolts T or the like. The both side plates 42, 42 are formed in a substantially L-shaped cross section, and are provided with first hinge shaft holes 46, 46 at positions extending upward orthogonally to the bottom plate 41. both side plates 42, 42 Pressure receiving member holes 47, 47 are provided on the bottom plate 41 side (downward) and at positions biased inward (forward) from the first hinge shaft holes 46, 46. The pressure receiving members 13 are inserted through the pressure receiving member holes 47, 47 provided in the both side plates 42, 42. Note that the pressure receiving members 13 do not have to be pin-shaped, and curved members or resin-made members may be attached between the both side plates 42, 42.

[0020] Furthermore, on the attachment member 4, along both sides along both sides of the rear plate 43 plate the both side plates 42, 42 are extended rearward, and further, each tip end portion thereof is bent parallel with a space between it and the rear plate 43, thereby forming rail portions 48, 48 for a finger pinching prevention cover 7A described later.

[0021] The support member 5 includes an upper plate 51, and both side plates 52, 52 extending in a direction orthogonal (including a substantially orthogonal direction) to the upper plate 51 so as to cover the both side plates 42, 42 of the attachment member 4 from both side end portions along the direction in which a pair of operation sliders 31 and a cam slider 32 described later slide among the end portions of the upper plate 51, and holding pieces 54, 54 formed by bending the tip end portions of the both side plates 52, 52 at 90° toward the opposing sides, and further, stopper pieces 55, 55 are provided upward from the both side plates 52, 52.

[0022] At one end (front end) of both side plates 52, 52, there are provided second hinge shaft holes 53, 53 (only one is shown) through which the second hinge shaft 12 is inserted, and notches 56, 56 (only one is shown) into which an operating member 14 to be described later enters. At the other end (rear end) of both side plates 52, 52, there are provided first hinge shaft holes 58, 58. The first hinge shaft holes 58, 58 of both side plates 52, 52 and the first hinge shaft holes 46, 46 of the attachment member 4 are axially aligned, and the first hinge shaft 11 is inserted through these holes, whereby the support member 5 is rotatably connected to the attachment member 4 about the first hinge shaft 11.

[0023] Inside the support member 5, an operating slider 31 and a cam slider 32 are accommodated and held by holding pieces 54, 54 bent inward from both side plates 52, 52. The operating slider 31 and the cam slider 32 have closing surfaces 31a, 32a which are the bottom surfaces, and are formed in a bottomed cylindrical shape with a rectangular cross section. The operating slider 31 and the cam slider 32 are individually accommodated in the support member 5 such that their openings face each other, and elastic members 21 each composed of a compression coil spring 21a are elastically provided inside the operating slider 31 and the cam slider 32. That is, the concave interiors of the operating slider 31 and the cam slider 32 are formed as spring accommodation portions 31b, 32b for accommodating the compression coil springs 21a, 21a. The compression coil springs 21a, 21a may be one or two or more. For example, two are provided in parallel or superposed, and bias the pair of operating slider 31 and cam slider 32 in directions away from each other. Further, an oil damper 9 is accommodated in one of the compression coil springs 21a, 21a and is installed between the operating slider 31 and the cam slider 32. As shown in FIGS. 12 to 15, when the original pressing plate 3 is closed from its open state to a predetermined closing angle, the tip of the piston 9a abuts against the inner bottom of the cam slider 32, thereby preventing the oil damper 9 from closing suddenly and providing a buffering action.

[0024] The pair of operating sliders 31 and the cam slider 32 are formed to have a length that is housed within the support member 5 when the bottom plate 41 of the attachment member 4 and the upper plate 51 of the support member 5 are substantially parallel (for example, when the original pressing plate opening / closing device 1A of the present invention is attached to a copying machine 2A or the like, and the original pressing plate 3 is brought into close contact with the contact glass 2c on the upper surface of the apparatus main body 2B (when the original pressing plate is in close contact)).

[0025] On the operating slider 31 on the tip end side, the outer surface of the closing surface 31a, which is the bottom surface thereof, is formed as a flat surface. This closing surface 31a presses the operating member 14 by the biasing force of the elastic member 21 so that the support member 5 and the lift member 6 overlap. In this case, the position where the lift member 6 is connected to the support member 5 by the second hinge shaft 12 is moved upward compared to the conventionally known one, and the lower surface side of the upper plate 61 of the lift member 6 is configured to abut against the stopper pieces 55, 55 that project upward from both side plates 52, 52 of the support member 5, creating a gap between the upper plate 51 of the support member 5 and the upper plate 61 of the lift member 6 so that the lift member 6 does not tilt with respect to the support member 5.

[0026] On the lower surface side of the cam slider 32, as shown particularly in FIG. 8, a recess 32c for attaching the second fire spread prevention cover C2 is provided on the lower surface side, and attachment holes 32d, 32d are provided in the recess 32c. With this configuration, since the second fire spread prevention cover C2 does not project to the lower surface side of the cam slider 32, there is no concern of hitting the first fire spread prevention cover C1 during sliding.

[0027] The lift member 6 includes an upper plate 61 having mounting holes 61a, 61a, 61a to be attached to the rear end side of the original pressing plate 3 with screws or the like, and both side plates 62, 62 extending from both end portions of the upper plate 61 in a direction orthogonal to the upper plate 61 (including a substantially orthogonal direction). Second hinge shaft holes 63, 63 (only one is shown) are provided on the tip end side of both side plates 62, 62 of the lift member 6, and below the second hinge shaft holes 63, 63, there are provided operating member holes 64, 64 through which the operating member 14 is inserted. The operating member 14 is inserted and fixed in the operating member holes 64, 64 of both side plates 62, 62. The second hinge shaft holes 63, 63 of both side plates 62, 62 of the lift member 6 and the second hinge shaft holes 53, 53 (only one is shown) of the support member 5 are axially aligned, and the second hinge shaft 12 is inserted through these second hinge shaft holes 63, 63 and the second hinge shaft holes 53, 53, whereby the lift member 6 and the support member 5 are rotatably connected to each other about the second hinge shaft 12. Incidentally, although the operating member 14 is shown as a single pin or a shaft-like member, other forms or those protruding integrally or separately from the tip end side of the lift member 6 may be used. The operating member 14 shall also include this type of member.

[0028] And in the present invention, on the front side of the original pressing plate opening / closing device 1A, a first fire spread prevention cover C1 is provided which has one end portion side attached to the lift member 6, covers the front side of the second hinge shaft 12, the operating member 14, and the support member 5, and has the other end portion side attached to the rear end portion side of the support member 5, and a second fire spread prevention cover C2 is provided which is attached to the cam slider 32 and covers the pressure receiving member 13.

[0029] The first fire prevention cover C1 has a pair of locking pieces C1a, C1a that are engaged with a pair of locking holes 51a, 51a provided at a predetermined interval on the tip side of the upper plate 51 of the support member 5 on one end side thereof. As shown in FIGS. 12 to 15, the curved portion C1b covers and wraps around the outside of the second hinge shaft 12 and the operating member 14, further covers the front side of the support member 5 and extends to the rear side of the support member 5, and is provided with mounting holes C1d, C1d provided in the mounting pieces C1c, C1c provided by folding back on the other end side thereof. The mounting screws 52b, 52b passed through the mounting holes 52a, 52a provided on both side plates 52, 52 of the support member 5 are screwed therein, thereby being fixed to the support member 5. The first fire prevention cover C1 is further provided with a recess C1e at a portion in contact with the cam slider 32 and the curved portion C1b covering the second hinge shaft 12 and the operating member 14.

[0030] The second fire prevention cover C2 is composed of a flat mounting portion C2a and a covering portion C2b curved from this mounting portion C2a. The mounting holes C2c, C2c provided in the mounting portion C2a are fixed to the mounting holes 32d, 32d provided on the lower surface side of the cam slider 32 with mounting screws C2e, C2e. As shown in FIGS. 12 to 15, the covering portion C2b wraps around the lower surface of the pressure receiving member 13 and covers it up to the rear side thereof. Further, protruding pieces C2d, C2d are provided on both sides of the mounting portion C2a.

[0031] Therefore, even if a fire breaks out around the document pressing plate opening / closing device 1A attached to the office equipment, the flame generated at that time is the first fire prevention cover C1 and the second fire prevention cover C2It can be blocked by [relevant means] to prevent the internal mechanism from being exposed to fire. Also, even if the end of the document placed on the document placement table 2C comes into contact with the front side of the document pressure plate opening / closing device 1A, the contact part is covered by the first fire spread prevention cover C1 and the second fire spread prevention cover C2, so there is no worry that the lubricating oil applied there will be soiled by the part where the lubricating oil is applied. Furthermore, the first fire spread prevention cover C1 and the second fire spread prevention cover C2 prevent airborne dust and floating substances from entering the inside of the document pressure plate opening / closing device 1A, so there is no worry that the function of the document pressure plate opening / closing device will be impaired by floating substances.

[0032] Moreover, a finger pinching prevention cover 7A is provided between the rear end part side of the support member 5 and the rear end part side of the lift member 6. As particularly shown in FIGS. 9(a) and 9(b), this finger pinching prevention cover 7A has substantially the same lateral width as that of the lift member 6 and a vertical width that fills the gap between the two when the lift member 6 is inverted with respect to the support member 5. This finger pinching prevention cover 7A is composed of a substrate part 8, both side plates 8a, 8a provided on both sides of this substrate part 8, and engaging protrusions 8c, 8c protruding from both end parts on the lower end part side of an engaging plate part 8b that is bent slightly inward from the substrate part 8 to be narrower in width. And as shown in FIG. 11, mounting holes 62a, 62a (only one is shown) are provided at the right end parts of both side plates 62, 62 of the lift member 6, and through the mounting holes 8d, 8d provided at the upper end parts of both side plates 8a, 8a of the finger pinching prevention cover 7A, it is rotatably connected by shaft support pins 8e, 8e. Furthermore, the engaging protrusions 8c, 8c provided on the lower end part side of this finger pinching prevention cover 7A are slidably engaged with rail parts 48, 48 provided on the mounting member 4 side in the vertical direction.

[0033] The document pressure plate opening / closing device 1A of this embodiment can further prevent a person from accidentally putting a finger or the like into the gap R (shown in FIG. 15) between the rear parts of the lift member 6 and the support member 5 formed during lift start-up by the finger pinching prevention cover 7A.

[0034] In addition, in the document pressing plate opening / closing device 1A according to this embodiment, the lower surface of the upper plate 61 of the lift member 6 abuts against the stopper pieces 55, 55 of the support member 5 by the biasing force of the elastic member 21, so that the upper plate 51 of the support member 5 and the upper plate 61 of the lift member 6 are substantially parallel and close to each other. Therefore, the rear end portion of the lift member 6 does not rotate downward. For this reason, when lifting the document pressing plate 3 and placing the document on the contact glass 2c surface on the upper surface of the apparatus main body 2B, usually, when lifting the document pressing plate 3 upward by holding the gripping portion provided at the end portion on the side opposite to the portion where the lift member 6 of the document pressing plate 3 is attached or in the vicinity thereof, the document pressing plate 3 rotates about the first hinge shaft 11, and the contact glass 2c surface is exposed to the outside. The document is placed on the exposed contact glass 2c surface.

[0035] After placement, when lowering the lifted document pressing plate 3, the document pressing plate 3 rotates (moves downward) about the first hinge shaft 11 in the direction of contacting the contact glass 2c surface. At this time, with the upper plate 61 of the lift member 6 remaining in contact with the stopper pieces 55, 55 of the support member 5 by the biasing force of the elastic member 21, that is, without the document pressing plate 3 (lift member 6) rotating about the second hinge shaft 12, the document pressing plate 3 rotates.

[0036] At this time, when the document (not shown) placed on the contact glass 2c surface is as thin as paper, the document pressing plate 3 makes surface contact when contacting the paper. As a result, the entire document is pressed against the document pressing plate 3 and the document is pressed against the contact glass 2c surface, so that the document stably adheres to the contact glass 2c surface.

[0037] On the other hand, when the document 90 placed on the contact glass 2c is thick like a book, as shown in FIGS. 14 and 15, when the document pressing plate 3 is closed, a part of the support member 5 of the document pressing plate 3 contacts the end portion 90a on the support member 5 side of the document 90 or the vicinity thereof, and the lift member 6 is reversed, whereby a gap R is formed between the rear end portion on the support member 5 side and the rear end portion of the lift member 6. That is, when the vicinity of the end portion on, for example, the gripping portion side of the document pressing plate 3 is pressed toward the document placing table 2C side, the operating member 14 presses the operating slider 31 toward the cam slider 32 side, and the operating slider 31 moves toward the cam slider 32 side against the biasing force of the elastic member 21, and the document pressing plate 3 (lift member 6) rotates about the second hinge shaft 12. That is, the document pressing plate 3 is reversed so as to cover the upper portion of the document 90. For example, when the upper portion of the document 90 is a flat surface, the document pressing plate 3 is in surface contact with this upper portion. Therefore, a thick document 90 like a book can be stably adhered to the contact glass surface on the document placing table 2C. And when the lift member 6 is reversed about the second hinge shaft 12, a gap R is formed between the rear end portion of the lift member 6 and the rear end portion of the support member 5. However, when the finger pinching prevention cover 7A is not provided, there is a risk that a person's finger or the like may enter this gap R. In the present invention, since this gap R is shielded by the finger pinching prevention cover 7A, it is possible to prevent a person's finger or the like from entering the gap R.

[0038] Furthermore, the finger pinching prevention cover 7A according to the present invention is connected to the lift member 6 by pivot pins 8e, 8e on the upper end portion side thereof, and the lower end portion side is engaged with rail portions 48, 48 provided on the attachment member 4 by engaging protrusions 8c, 8c. Therefore, after the document pressing plate opening / closing device 1A is attached to the copying machine 2A, it is configured so that it cannot be artificially removed, so the safety is further enhanced.

Industrial Applicability

[0039] As described in detail above, the document pressing plate opening / closing device 1A according to the present invention can prevent the influence caused by the ignition of peripheral electronic devices by the first fire spread prevention cover and the second fire spread prevention cover. Furthermore, compared with the conventional ones, the documentlubricating oil It can prevent dirt from lubricating oil . Also, with the finger pinching prevention cover, the user can use it safely without the worry of pinching their fingers. In particular, it is suitable for use as an original pressing and opening / closing device for office equipment such as copiers, and this original pressing plate opening / closing device equipped with is preferably used as office equipment.

Explanation of Signs

[0040] 1A Original pressing plate opening / closing device 2A Copier 2B Device body 3 Original pressing plate 4 Mounting member 5 Support member 6 Lift member C1 First fire spread prevention cover C2 Second fire spread prevention cover 7A Finger pinching prevention cover 11 First hinge shaft 12 Second hinge shaft 13 Pressure receiving member 14 Actuating member 21 Elastic member 21a Compression coil spring 31 Actuating slider 32 Cam slider

Claims

1. An attachment member attached to the apparatus main body side of an office machine having an original pressing plate, a support member rotatably supported on the attachment member via a first hinge shaft, and overlapping the support member and rotatably supported on the free end side of the support member via a second hinge shaft in a direction opposite to that of the support member. A lift member attached to the original pressing plate, a cam slider provided inside the support member in contact with a pressure receiving member attached to the attachment member, and an operation slider provided in contact with an operation member provided on the lift member, and an elastic member elastically provided between the cam slider and the operation slider. In the original pressing plate opening and closing device, a first fire spread prevention cover having one end attached to the support member, covering the second hinge shaft, the operation member, and the front side of the support member, and the other end attached to the other end side of the support member, and a second fire spread prevention cover attached to the cam slider and covering the pressure receiving member. The original pressing plate opening and closing device is characterized in that it is provided.

2. The first fire spread prevention cover is characterized in that a locking piece provided on one end side thereof is inserted and locked into a locking hole provided on the back plate of the support member, and the other end side is fixed to both side plates of the support member. The original pressing plate opening and closing device according to claim 1.

3. The second fire spread prevention cover is characterized in that one end side thereof is fixed to the cam slider, and the other end side is curved and has a length capable of covering the pressure receiving member even when the original pressing plate attached to the lift member is opened. The original pressing plate opening and closing device according to claim 1.

4. The original pressing plate opening and closing device is characterized in that the cam slider is provided with a recess for attaching the second fire spread prevention cover. The original pressing plate opening and closing device according to claim 1.

5. The first fire spread prevention cover is characterized in that a recess for allowing a portion of the second fire spread prevention cover to escape is provided. The original pressing plate opening and closing device according to any one of claims 1 to 4.

6. An office machine, characterized by comprising the original pressing plate opening and closing device according to each of claims 1 to 4.

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