JP5811433B2 - Document crimping plate opening and closing device and office equipment - Google Patents

Description

  The present invention relates to a document pressure plate for office equipment such as a copying machine, a printing machine, and a printer, a document pressure plate for office equipment referred to as a so-called multifunction machine having various functions such as a printer, a facsimile, and a scanner in addition to a copying function. Documents with a lift function suitable for use in attaching a document crimping plate with an ADF device (automatic document feeder) (in this application, all of them are referred to as a document crimping plate) to the device main body so as to be opened and closed. The present invention relates to a pressure plate opening / closing device and office equipment provided with the original pressure plate opening / closing device.

  Currently, as described in Patent Document 1 below, most of the commercially available manuscript crimping plates for office equipment are attached to the manuscript crimping plate opening / closing device provided at the rear upper end of the device body. . Such a document crimping plate opening / closing device overlaps the support member, an attachment member attached to the apparatus main body of the office equipment, a support member rotatably supported by the attachment member via the first hinge shaft, and the support member. A lift member that is rotatably supported by a free end of the support member via a second hinge shaft in a direction opposite to the rotation direction of the support member, and is attached to a document crimping plate; the attachment member; Provided with a supporting member, and having elastic means for urging the original pressure plate in the opening direction and for urging the lift member in a direction overlapping with the support member. The end portion is configured to open and close in the vertical direction with the first hinge shaft as a fulcrum.

  In the document crimping plate opening / closing device described in Patent Document 1, in the case of a thick document such as a book, the thick document is placed on the contact glass surface of the scanner unit and the document crimping plate is closed. When the edge portion of the upper surface of the rear portion of the thick document hits the lower surface of the document pressure-bonding plate, the document pressure-bonding plate is further pushed down against the elasticity of the elastic means, thereby using the edge portion of the document as a fulcrum. The document crimping plate is lifted through a lift member according to the lever principle, and the upper surface of the thick document can be covered in a horizontal state.

  Furthermore, as described in the following Patent Document 2, a mounting leg is provided on the mounting member instead of the lift member, and the mounting leg can be slid vertically in an insertion hole provided at the upper rear end of the device body. A document crimping plate opening and closing device configured to be as follows is also known.

  In the document crimping plate opening / closing device described in Patent Document 2, when the document is a thick document such as a book, when the document crimping plate is closed, the lower surface of the document crimping plate hits the lower surface of the thick document. Further, when the original cover is pressed down, the mounting leg portion slides upward in the insertion hole so that the upper surface of the thick original can be covered with the original cover in the horizontal direction.

JP 2006-010979 A Japanese Patent Laid-Open No. 2006-039440

  In the document crimping plate opening / closing device described in each of the above-mentioned Patent Documents 1 and 2, for example, when a thin document such as one sheet is placed on the contact glass of the scanner unit and the document crimping plate is closed, the wind is behind the contact glass. Since the air flows obliquely from the front to the front, there is a problem that the document placement position is easily shifted by this wind. For this reason, it is necessary to close the document crimping plate gently so that the document is not displaced, or to close the document crimping plate while pressing it from above the document. There was a problem that it was easy to pinch.

  Further, in the configuration of the conventional document pressing plate opening / closing device described in Patent Document 1, when the document is a thick document such as a book, a heavy load is applied to the thick document, and a print position shift occurs due to the load. There was a problem that the thick original was damaged and the contact glass of the scanner unit was overloaded.

  The present invention has been made to solve the above-described problems of the prior art, and the first object thereof is to open the original cover from a closed state, and to open the original cover from a predetermined opening angle. It is an object of the present invention to provide a document crimping plate opening / closing device configured so that the document crimping plate is smoothly raised or lowered from the upper surface of the contact glass in a horizontal state when closing.

In order to achieve the above-described object, the present invention provides a selection operation for selecting an opening / closing mechanism, a lift mechanism, an opening / closing mechanism, and an operation of the lift mechanism of a document crimping plate assembled to an attachment member attached to an apparatus main body of an office device. The opening / closing mechanism is attached to the rear side of the both side plates of the mounting member so as to be rotatable via a main shaft, and is attached to the free end side of the both side plates of the upper arm member. The original pressure plate supporting member, a spring case attached to the front side of the both side plates of the mounting member via a spring low shaft, and a spring case slidably received. A slider case attached to a substantially central portion of both side plates of the upper arm member via a spring-up shaft so as to be swingable. And an elastic means elastically provided between the slider case and the spring case, and the lift mechanism includes a lower arm member rotatably connected to the upper end side of the lift mechanism, and the lower arm. A link mechanism comprising a link arm connecting the lower end side of the member and the lower end side of the upper arm member, and the selection operation means includes a first guide groove provided in the attachment member of the opening / closing mechanism; A guide comprising a guide groove comprising a second guide groove and a roller attached to a roller shaft which is fitted in each of the guide grooves and which constitutes the lift mechanism and is fitted in the guide groove. And the opening and closing of the document crimping plate in the horizontal state by the lift mechanism from the end of the lifting operation in the horizontal state. Configuration operates, the lifting mechanism than at closing operation the end of the opening and closing mechanism is characterized by being configured so as to lower the original cover in a horizontal state.

  In this case, the present invention provides an upper arm member rotatably attached to the attachment member, a lower arm member attached to a lower end portion of the upper arm member via a link arm, and the upper arm member. The lower arm member is composed of a supporting member for the original pressure plate that connects the free ends of the lower arm member.

The present invention is also characterized in that the guide member is a roller shaft .

  In the present invention, it is preferable that the elastic means is constituted by a compression coil spring.

  The present invention is characterized in that the document crimping plate opening / closing device having the above-described configuration is used as office equipment.

  According to the present invention, even if the original cover is closed when there is a thin document to be copied on the contact glass, the original cover is closed in a horizontal state. It can be prevented from occurring. If the original is a thick original such as a book, place the thick original on the contact glass with the original pressure plate lifted up horizontally, and close the original pressure plate to close the original. Since the plate is closed in a horizontal state, it is not necessary to press the original pressure plate more strongly and reverse it against the elasticity of the elastic means as in the prior art. It is possible to achieve an effect that the pressing force is not applied to the contact glass.

FIG. 3 is a perspective view of the copying machine as an example of office equipment using the document pressing plate opening / closing device according to the present invention, in which the document pressing plate is opened. 1 is a perspective view of a document crimping plate opening / closing device according to the present invention. It is a side view at the time of closing of a manuscript press board opening and closing device concerning the present invention. It is a side view at the time of lift-up of the original pressure plate of the original pressure plate opening / closing apparatus according to the present invention. FIG. 5 is a side view of the document crimping plate opening / closing apparatus according to the present invention in a state where the document crimping plate is rotated by 10 ° from the lift-up state illustrated in FIG. FIG. 5 is a side view of a document crimping plate opening / closing apparatus according to the present invention in a state where the document crimping plate is rotated and opened by 20 ° from the lift-up state illustrated in FIG. 4. FIG. 3 is an exploded perspective view of a document crimping plate opening / closing device according to the present invention. It is explanatory sectional drawing which shows the state of the lift mechanism in the state of FIG. FIG. 5 is an explanatory sectional view showing the operation of the lift mechanism in the state of FIG. 4. FIG. 6 is an explanatory sectional view showing the operation of the opening / closing mechanism in the state of FIG. 5. It is sectional drawing explaining operation | movement of the opening-and-closing mechanism in the state of FIG. FIG. 5 is a side cutaway view of a state where the original cover is rotated by 25 degrees from the lift-up state shown in FIG. 4 of the original cover according to the present invention. It is a perspective view of an attachment member. It is a perspective view of a spring case. It is a side view of a slider case. It is a top view of an upper arm member It is a top view of a lower arm member.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a configuration of a document crimping plate opening / closing device and office equipment using the document crimping plate opening / closing device according to the present invention will be described in detail with reference to the accompanying drawings. The office equipment is not particularly limited, and examples thereof include office equipment as a single unit such as a copying machine, a printing machine, and a printer, and a multifunction machine having various functions such as a copying machine, a facsimile machine, and a scanner. However, the present invention is not limited to this.

  As shown in FIG. 1, a document crimping plate opening / closing apparatus according to the present invention is configured to attach a document crimping plate 18 to the rear end portion of an apparatus main body 1a of an office machine (the same applies to a copying machine) 1 so as to be opened and closed. Incidentally, a pair of document pressing plate opening / closing devices are usually provided and indicated as instruction symbols 1A and 1B. In the embodiment, the indication symbol 1B has one elastic means, but the basic configuration is the same as that of 1A. However, the same configuration may be used, and the document crimping plate opening / closing device 1B may have a different configuration without elastic means as long as the operation of the document crimping plate opening / closing device 1A is not hindered. In the following description, only the document crimping plate opening / closing device indicated by the instruction symbol 1A will be described.

  For example, an automatic document feeder 18 a having a known configuration is provided on the upper side of the document pressing plate 18. The automatic document feeder 18a is for efficiently copying and transmitting a plurality of documents. The automatic document feeder 18a includes a document feeder (not shown) provided on one side of the upper portion of the document crimping plate 18, and when the document is set in the document feeder, the document is automatically fed out sequentially and copied. And can be sent.

  The document pressing plate opening / closing device 1A according to the present invention is composed of an opening / closing mechanism K and a lift mechanism R assembled to a mounting member 2 mounted on the device main body 1a of the office device 1 as shown in FIG. Has been.

  The attachment member 2 is formed by pressing a metal plate such as SPCC, for example, and a bottom plate 2a attached to the apparatus main body 1a and directions orthogonal to the bottom plate 2a from both side end portions of the bottom plate 2a. The side plates 2b and 2b are folded in a direction (including a substantially perpendicular direction), and folded in a direction (including a substantially perpendicular direction) perpendicular to the bottom plate 2a from one end (rear end) of the bottom plate 2a. It consists of a substantially rectangular rear plate 2c. Of course, a molded product of synthetic resin may be used as long as strength is obtained.

As shown in FIGS. 7 and 13, the mounting member 2 is placed on the apparatus main body 1a through a mounting button having a known configuration (not shown) that is passed through a flat gourd-shaped mounting hole 2e provided in the bottom plate 2a. Removably attached. Both side plates 2b and 2b are provided with first mounting holes 2d and 2d for mounting bearing members 10c and 10c having bearing holes 10b and 10b at the upper ends of the rear portions, and a spring low shaft which will be described later on the front end side. Second attachment holes 2 f and 2 f for attaching the spring case 3 via 9 are provided. The both side plates 2b and 2b of the mounting member 2 are further provided with arc-shaped firsts which are located between the first mounting holes 2d and 2d and the second mounting holes 2f and 2f but have different radii but are continuous with each other. Guide grooves 2i and 2i including guide grooves 2g and 2g and second guide grooves 2h and 2h are provided, and a stopper plate 19 is attached to the rear plate 2c via attachment screws 19a and 19a. . Crossing portions 2j and 2j are provided at the connecting portion between the first guide grooves 2g and 2g and the second guide grooves 2h and 2h.

First, the configuration of the opening / closing mechanism K will be described. The opening / closing mechanism K includes a main shaft 10 connected to bearing holes 10b and 10b of bearing members 10c and 10c attached to first attachment holes 2d and 2d provided on the rear side of both side plates 2b and 2b of the attachment member 2. An upper arm member 6 rotatably attached to the upper arm member 6, a support member 8 of the original cover 18 attached to the free end of the upper arm member 6, and front ends of both side plates 2 b and 2 b of the attachment member 2. A spring case 3 slidably mounted on the side of the upper arm member 6 via a spring low shaft 9, and the spring case 3 is slidably accommodated, and springs up at substantially the center of both side plates 6 b and 6 b of the upper arm member 6. A slider case 4 mounted so as to be swingable via a shaft 11, and an elastic member between the slider case 4 and the spring case 3. And an elastic means 5, which is. In the first embodiment, large and small compression coil springs 5a, 5a, 5b, and 5b are overlapped on the elastic means 5, respectively.

  As shown in FIGS. 7 and 14, the spring case 3 is a molded product having one end opened and formed by molding a synthetic resin such as POM, for example. The spring case 3 has a spring on the bottom (hereinafter also referred to as a tip). It has a connecting hole 3a that is swingably connected to the low shaft 9, and has slits 3b and 3b on both sides. In the embodiment, in order to accommodate the elastic means composed of the compression coil springs arranged in parallel, the shape of the spring accommodating portion 3c has a shape of approximately 8 in cross section. It can also be made into a shape.

  The slider case 4 is made by pressing a metal plate such as SPCC, for example, and as shown in FIGS. 7 and 15, the upper plate 4a is bent downward from one end side of the upper plate 4a. Contact plate portion 4b of elastic means 5, both side plates 4c and 4c bent downward from both side portions of upper plate 4a, and a holding plate formed by bending inward from the lower end portions of both side plates 4c and 4c. 4d and 4d (particularly FIG. 15), and the spring case 3 is slidably accommodated therein. Further, escape grooves 4e and 4e are provided on the front end side of the side plates 4c and 4c of the slider case 4, and the rear end side is connected to the upper arm member 6 via the spring-up shaft 11. Holes 4f and 4f are provided. The slider case 4 can be, for example, a POM or other strong synthetic resin molded product.

  The upper arm member 6 is made by pressing a metal plate such as SPCC, for example, and has an upper plate 6a and both side plates 6b and 6b formed by bending the upper plate 6a from both sides to the lower side. In particular, as shown in FIGS. 7 and 16, the upper plate 6a is provided with a notched portion 6d having a U-shaped flat surface. Further, on the lower end side of both side plates 6b and 6b, first connection holes 6e and 6e connected to the main shaft 10 and second connection connected to link shafts 15 of link arms 12 and 12 of the lift mechanism R described later. Holes 6f and 6f are provided, third connection holes 6g and 6g for connecting the spring-up shaft 11 are provided in the substantially central portion, and the upper end side is connected to the second lift shaft 14 connected to the support member 8. The fourth connection holes 6h, 6h are provided.

  The support member 8 is made by pressing a metal plate such as SPCC, for example. The upper plate 8a, both side plates 8b and 8b bent downward from both side portions of the upper plate 8a, and both side plates. 8b and 8b have attachment plates 8c and 8c of the original cover 18 bent outward from the lower end side, and the second lift shaft 14 is connected to the upper end sides of both side plates 8b and 8b. Connection holes 8d and 8d for connecting to the first lift shaft 13 to be described later are provided.

  Next, the configuration of the lift mechanism R will be described. The lift mechanism R includes a support member 8, a lower arm member 7 whose upper end side is rotatably connected to the support member 8, a lower end side of the lower arm member 7, and a lower end side of the upper arm member 6. Are connected to the upper arm member 6 side of the link arms 12, 12 and are fitted into first guide grooves 2g, 2g provided on both side plates 2b, 2b of the attachment member 2. The roller shafts 16 and 16 and the rollers 17 and 17 constituting the guide member 20 are configured. In this case, the guide member 20 may include only the roller shafts 16 and 16 by omitting the rollers 17 and 17.

  The upper arm member 6, the lower arm member 7, the link arms 12, 12 that connect the lower ends of the upper arm member 6 and the lower arm member 7, and the free ends of the distal ends of the upper arm member 6 and the lower arm member 7. A link mechanism L is configured by the connected support member 8. That is, it can be said that the lift mechanism R is constituted by the link mechanism L.

  The lower arm member 7 is made by pressing a metal plate such as SPCC, for example, and the upper plate 7a is provided with notches 7c as shown in FIG. 15, and is lower than both side ends of the upper plate 7a. The both side plates 7b, 7b suspended from the front side are provided with connecting holes 7d, 7d for connecting the first lift shaft 13 on the upper end side, and fixing holes 7e, 7e for fixing the roller shaft 16 as described above. The position is shifted in the direction. The lower arm member 7 can be made of, for example, POM or other strong synthetic resin.

  The link arms 12, 12 have fixing holes 12a, 12a and connecting holes 12b, 12b, and the second connecting holes 6f of the upper arm member 6 via the link shafts 15, 15 attached to the fixing holes 12a, 12a. While being fixed to 6f, it is connected with the fixing holes 7e and 7e of the lower arm member 7 through the roller shafts 16 and 16 attached to the connecting holes 12b and 12b.

  The selection operation means S includes link arms 12 and 12, guide members 20 including rollers 17 and 17 attached to the link arms 12 and 12, and both side plates 2b of the attachment member 2 into which the guide members 20 are fitted. It comprises guide grooves 2i, 2i comprising first guide grooves 2g, 2g and second guide grooves 2h, 2h provided in 2b. As described above, the guide member 20 may not necessarily be the rollers 17 and 17.

  Next, what is indicated by instruction symbols 16a and 16a in the drawing is a washer for the roller shafts 16 and 16, and instruction symbols 16b and 16b are spacers. Further, the reference symbols 13a, 13a and 14a, 14a are spacers of the first lift shaft 13 and the second lift shaft 14. Furthermore, what is indicated by the instruction symbols 11a and 11a is a color. Further, the spring low shaft 9 has a flange portion 9a at one end, and is fixed by caulking the other end to one side of the second mounting holes 2f, 2f. The main shaft 10 also has a flange portion 10a at one end portion, and has a configuration in which a washer 10d is fitted into the other end portion through the bearing members 10c and 10c. This washer 10d may be an E-ring. Furthermore, the spring-up shaft 11, the first lift shaft 13, and the second lift shaft 14 are also provided with flange portions 11b, 13b, 14b at one end, and the other end portions are caulked to connect the connecting holes 4f, 4f,. It is the structure fixed by crimping to one side of 8d, 8d * 8e, and 8e. Of course, an E ring or other locking ring may be used instead of caulking.

  Next, the function and effect of the original cover 1A will be described.

  First, as shown in FIGS. 3 and 8, when the original cover 18 is closed with respect to the apparatus main body 1a of the office machine 1 such as a copying machine, the lower face of the original cover 18 is weighted. In the case of a thin document, the thin document is pressed onto the contact glass 1b. Further, when the original pressure plate opening / closing device 1A is closed, the slider case 4, the upper arm member 6, the lower arm member 7, and the support member 8 are mutually connected to the mounting member 2 as shown in FIG. It is in an overlapping state.

  Next, in order to open the original cover 18 from its closed state, when the handle 18b (shown in FIG. 1) on the near side is lifted upward to open the original cover 18 first, a selection operation is performed. As shown in FIGS. 4 and 9, the lift mechanism R operates via the means S to lift the original cover 18 with respect to the contact glass 1b horizontally.

  That is, when the handle 18b on the front side of the original cover 18 is lifted by hand, the upper arm member 6 and the lower arm member 7 are formed by the support member 8 and the link arms 12 and 12 constituting the link mechanism L of the lift mechanism R. Since the support member 8 is lifted horizontally with respect to the contact glass 1b, the original cover 18 attached to the support member 8 is similarly lifted in the horizontal state. That is, when the user presses and lifts the front side of the document pressing plate 18, the link arms 12, 12 become the first guide grooves 2 g of the guide grooves 2 i, 2 i of the mounting member 2, as shown in FIGS. 8 and 9. The upper arm member 6 and the lower arm member 7 are rotated rightward in the figure through the rollers 17 and 17 fitted in 2g, and the upper arm member 6 and the lower arm member 7 are rotated rightward in the figure. 4 and 9, the original cover 18 is lifted in a state of being maintained in a horizontal state with respect to the contact glass 1b. . When the weights of the elastic means 5 and the original cover 18 are balanced at the predetermined ascending position, the original cover 18 does not fall naturally even when the hand is released, and can maintain the horizontal open state.

  When the document pressing plate 18 rises to a predetermined height in a horizontal state, the rollers 17 and 17 fitted in the first guide grooves 2g and 2g are intersected by the first guide grooves 2g and 2g and the second guide grooves 2h and 2h. Since the parts 2j and 2j are reached, the ascending operation of the original cover 18 in the horizontal state ends here.

When the front side of the original cover 18 is further lifted upward from this horizontally raised state, the opening / closing mechanism K is operated via the selection operation means S this time. That is, the upper arm member 6 receives a force to rotate rightward with the main shaft 10 as a fulcrum, and the rollers 17 and 17 are fitted into the second guide grooves 2h and 2h of the guide grooves 2i and 2i. Rightward rotation is allowed. Then, the original cover 18 rotates together with the support member 8 while maintaining the height of the horizontally raised state. As shown in FIGS. 5 and 10 , the original cover 18 and the main shaft 10 together with the support member 8. It will be opened by rotating around the fulcrum. Then, since the elastic force of the elastic means 5 acts on the support member 8 via the slider case 4, the original cover 18 is opened without feeling too much weight. When the weight of the original cover 18 is balanced, even if the hand is released from the original cover 18, it does not drop and close naturally.

  Accordingly, the rotational moment of the original cover 18 is balanced with the elasticity of the elastic means 5 in a predetermined opening angle range, so that both hands can be used for contact at the open use angle that does not fall naturally even if the hand is released from the original cover 18. It is possible to place or replace the original on the glass 1b.

  Of course, here, the original pressure plate 18 may be held open with one hand, and the original may be exchanged with the other hand.

  When the original is placed on the contact glass 1b, or after the original is copied, the original is removed from the contact glass 1b, and the handle 18b on the front side of the original crimping plate 18 is pushed downward by hand, the link mechanism L As a result, the lift mechanism R does not operate, the rollers 17 and 17 roll in the second guide grooves 2h and 2h in the opposite direction, and the document pressing plate 18 is closed to the original horizontal state by the opening and closing mechanism K. 4 and FIG. 9, when the lifted horizontal state is restored, the lift mechanism R is now operated and the original cover 18 is closed with respect to the contact glass 1b in a horizontal state.

  Therefore, as shown in FIGS. 4 and 9, even if the original pressure plate 18 is closed when there is a thin original to be copied on the contact glass 1b, the original pressure plate 18 is closed in a horizontal state. It is possible to prevent a positional deviation from being caused by a slanting wind.

  On the other hand, when the original is a thick original G such as a book, the thick original G is placed on the contact glass 1b with the original pressing plate 18 lifted in a horizontal state, and the original pressing plate 18 is closed. Then, since the original cover 18 is closed in a horizontal state, it is not necessary to reverse the original cover against the elasticity of the elastic means unlike the prior art, so that unnecessary force is not required. Therefore, the operability is improved and no excessive pressing force is applied to the contact glass.

  FIG. 12 shows a state in which the original cover 18 is further opened. Even when the original cover 18 is thus opened, the rear portion of the original cover 18 does not unnecessarily protrude toward the back of the office equipment 1. Therefore, the rear space when installing the office equipment 1 near the wall can be omitted.

  As described above, the document crimping plate opening / closing device according to the present invention has various functions such as a document crimping plate for office equipment such as a copying machine, a printing machine, and a printer, a printer, a facsimile machine, a scanner, etc. in addition to a copying function. It is suitably used as an opening / closing device for opening / closing a document crimping plate of an office machine called a so-called multi-function machine or a document crimping plate with an ADF device (automatic document feeder), and the document crimping plate opening / closing device according to the present invention is used. It is also useful as office equipment.

1A, 1B Document Crimping Plate Opening / Closing Device K Opening / Closing Mechanism L Link Mechanism R Lift Mechanism S Selection Operation Means 1 Office Equipment 1a Equipment Main Body 2 Mounting Member 2b, 4c, 6b, 7b, 8b Both Sides Plate 2g First Guide Groove 2h Second Guide Groove 2i guide groove 3 spring case 4 slider case 5 elastic means 5a, 5b compression coil spring 6 upper arm member 7 lower arm member 8 support member 9 spring low shaft 10 main shaft 11 spring up shaft 12 link arm 17 roller 18 original pressure plate 20 Guide member

Claims (5)

An open / close mechanism of a document crimping plate assembled to an attachment member attached to an apparatus main body of office equipment, a lift mechanism, a selection operation means for selecting an operation of the open / close mechanism and the lift mechanism,
The opening / closing mechanism includes an upper arm member rotatably attached to the rear side of both side plates of the attachment member via a main shaft, and the document attached to the free end side of the both side plates of the upper arm member A support member for the crimping plate, a spring case attached to the front side of the both side plates of the attachment member via a spring low shaft, and a slidably received spring member for accommodating the upper arm member. A slider case attached to a substantially central portion of both side plates via a spring-up shaft so as to be swingable, and an elastic means elastically provided between the slider case and the spring case.
The lift mechanism includes a lower arm member whose upper end portion is rotatably connected to the support member, and a link mechanism that connects a lower end portion side of the lower arm member and a lower end portion side of the upper arm member. Consisting of
The selection operation means includes a guide groove including a first guide groove and a second guide groove provided on the attachment member of the opening / closing mechanism, and a link arm constituting the lift mechanism when fitted in each of the guide grooves. And a guide member consisting of a roller attached to a roller shaft fitted in the guide groove,
The selection operation means operates the opening / closing mechanism from the end of the lifting operation of the document pressing plate in the horizontal state by the lift mechanism, and the document in the horizontal state from the end of the closing operation of the opening / closing mechanism. A document crimping plate opening and closing device, characterized in that the crimping plate is lowered . The link mechanism, the upper arm member rotatably attached to said mounting member, and a lower arm member attached via the link arm to the lower end of the upper arm member, the free end of the upper arm member and the lower arm member The document crimping plate opening and closing device according to claim 1, wherein the document crimping plate opening and closing device is connected to the document crimping plate supporting member.   The document crimping plate opening and closing device according to claim 1, wherein the guide member is a roller shaft. 2. The document crimping plate opening and closing device according to claim 1, wherein the elastic means is a compression coil spring. An office machine characterized in that the document crimping plate opening and closing device according to any one of claims 1 to 4 is used.

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