JP2013050551A - Document pressing plate opening/closing device and office machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a document pressing plate opening/closing device in which bending prevention means in a document pressing plate is arranged in a support member so as not to protrude therefrom, and to provide an office machine using the document pressing plate opening/closing device.SOLUTION: A document pressing plate opening/closing device comprises: an attachment member to be attached to a device body side; a support member whose both end plates are rotatably coupled to both end plates of the attachment member through hinge pins; a lift member which is pivotably attached to free ends of both side plates of the support member through coupling pins to be rotatable in a different direction to the rotational direction of the support member and to which a document pressing plate is attached; an operation member provided at a position which is pivotable around the coupling pins of the lift member; a pressure-receiving member pivotably supported between both side plates on the attachment member side; and a cam slider and a spring-receiving member slidably provided inside the support member while elastic means being functioned between the pressure-receiving member and the operation member. Bending prevention means is provided by being housed and attached inside housing and attaching parts respectively provided in the cam slider and the spring-receiving member.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manuscript crimping plate opening / closing device provided with a mechanism for preventing folding of a manuscript crimping plate of an office device such as a copying machine or a printing machine, and office equipment using the manuscript crimping plate opening / closing device.

  2. Description of the Related Art Conventionally, particularly as a document crimping plate opening / closing device of a copying machine, it has an attachment base and both side plates raised from both sides of the attachment base, an attachment member for attaching the attachment base to the apparatus main body, at least a back plate and a back plate. A support member which has both side plates bent from the plate, and is rotatably connected to both side plates of the mounting member via hinge pins; a back plate to which the original cover is attached; and both side plates bent from the back plate A lift member that is pivotally attached to the free ends of both side plates of the support member via a connecting pin so that both side plates can be rotated in a direction different from the support member, and the lift member A position different from the hinge pin between the actuating member provided on the shaft-attached portion side with respect to the support member and located at a position where the connecting pin pivots around the connecting pin when the lift member rotates. A pressure receiving member that is mounted on a shaft, a cam slider that is slidably accommodated inside the support member with a cam portion abutting against the pressure receiving member, and a free end inside the support member that contacts the operating member. A spring receiving member that is slidably received in contact with the cam slider and the spring receiving member is elastically provided to rotate the biasing member in a direction overlapping the support member. Patent Document 1 listed below discloses an office device using at least an elastic means for urging the support member in the opening direction of the original pressing plate and the original pressing plate opening / closing device.

  In this conventionally known document crimping plate opening and closing device and office equipment, the elastic means pushes the operating member via the spring receiving cam member and presses the lift member in the direction of overlapping with the support member. The opening and closing operation of the heavy document pressing plate with the document feeder can be performed without feeling the weight. When the original is a thick original such as a book, the thick original is placed on the original placement table of the main body of the office equipment, and the lower surface of the original pressure plate is changed to a thick original. When it is closed until it abuts and further pressed down, the original pressing plate allows the reversal of the lift member with the connecting pin as a fulcrum by sliding the spring receiving member against the elastic force of the elastic means. The document crimping plate attached to the can be reversed together with the lift member together with the connecting pin as a fulcrum to cover the upper surface of the thick document horizontally, allowing external light to enter the exposure system inside the main body. It is configured to prevent as much as possible.

  However, if the original pressure plate is closed by pressing strongly with hand to close suddenly, the original pressure plate will resist the elasticity of the elastic means together with the lift member even when the original is not a thick original. In some cases, the connecting pin may be inverted as a fulcrum. This phenomenon is referred to as a middle folding phenomenon of the document crimping plate. If the document crimping plate is closed in this folded state, the document crimping plate cannot be closed in the correct posture or the document is displaced. The problem that it ends up occurred.

  In view of this, in the following Patent Document 2, the present patent applicant has proposed a manuscript crimping plate opening / closing device provided with a middle folding preventing means for preventing the middle folding phenomenon, and office equipment equipped with the manuscript crimping plate opening / closing device.

JP 2001-154287 A JP 2008-257167 A

  Of the document crimping plate opening and closing device proposed by the applicant of the present invention in Patent Document 2, the first embodiment includes an engagement receiving portion provided on one of the support member and the lift member, and the engagement receiving portion. An engaging means comprising an engaging portion that engages and is movably provided on one of the support member and the lift member, and is provided movably on the support member, and the document pressing plate is moved in the closing direction. Disengagement in which the engagement portion is moved to release the engagement between the engagement portion and the engagement receiving portion before the original pressure plate is rotated to contact the original placed on the upper surface of the apparatus main body. Although it was provided with a disengagement means composed of a member, the engagement means had a structure that protruded greatly on the upper part of the back plate of the lift member. The engaging means is accommodated on the lower surface of the original cover. Without providing the pace there is a problem that should not be.

  Moreover, since the thing of Example 2 provided the big accommodation hole in the backplate part of the supporting member, and attached | subjected a folding prevention means to this accommodation hole, it will influence the intensity | strength of a supporting member. There was a fear.

  The object of the present invention is to solve the above-mentioned problems, and by providing the middle break prevention means in the support member so as not to protrude to the outside, the strength of the support member is affected. Documents that do not need to be provided with a large receiving hole, give a person with a clean impression on the appearance of the document crimping plate opening / closing device, and do not need to provide a storage space for the engaging means on the document crimping plate It is an object of the present invention to provide a pressure plate opening / closing device and office equipment using the original pressure plate opening / closing device.

  In order to solve the above-described problems, the present invention provides a mounting member that is attached to the apparatus main body side, a support member that has both side plates rotatably connected to both side plates of the mounting member via hinge pins, and both side plates of the support member. A lift member to which a document pressure plate is attached so as to be rotatable in a direction different from that of the support member via a connecting pin on the free end side of the support member, and pivots on the connecting pin of the lift member as a fulcrum An operating member provided at a position, a pressure receiving member that is pivoted between both side plates on the mounting member side, and an elastic means that acts between the pressure receiving member and the operating member while being accommodated in the support member. In the slidably provided cam slider and spring receiving member, the inner folding prevention means is provided inside the receiving portion provided with the cam slider and the spring receiving member, respectively. It is accommodated, characterized in that provided.

  The present invention also includes a mounting base and both side plates raised from both sides of the mounting base, a mounting member for mounting the mounting base to the apparatus body side, and at least a back plate and both side plates bent from the back plate. A support member rotatably connected to both side plates of the mounting member via hinge pins, a back plate and both side plates bent from the back plate, the free ends of the side plates of the support member A lift member for attaching a document pressure-bonding plate that is pivotally attached so that both side plates can be rotated in a direction different from that of the support member via a connecting pin on the side, and a shaft attachment portion of the lift member with respect to the support member Operating member provided at a position where the connecting pin pivots around the connecting pin when the lift member rotates, a pressure receiving member pivoted between both side plates on the mounting member side, and a cam portion on the pressure receiving member Abutted A cam slider slidably housed inside the support member, a spring receiving member slidably housed in contact with the operating member on a free end side in the support member, and the cam A coil spring that urges the support member in at least the opening direction of the original pressure plate while rotating and urging the lift member in a direction overlapping with the support member by providing a spring between the slider and the spring receiving member; An anti-folding means for preventing the original crimping plate from being bent at a predetermined opening / closing angle of the original crimping plate or more. The intermediate folding prevention means is provided in the cam slider and the spring receiving member, respectively. It is provided so as to be housed inside the mounting portion, and acts on the lift member to prevent its reversal at a predetermined opening / closing angle or more of the original cover. The features.

  In any of the cases described above, the present invention provides that the middle folding preventing means acts on the lift member via a spring receiving member, and the original crimping plate is folded halfway within a predetermined opening / closing angle range. Can be configured to prevent.

  The present invention further provides that the intermediate folding preventing means acts on the spring receiving member in a predetermined opening / closing angle range of the original pressing plate to restrict a pressing operation on the operating member, thereby preventing the predetermined pressing of the original pressing plate. In the open / close angle range, it is also possible to prevent the original crimping plate from being bent.

  The present invention further includes a first link base housed in the first housing portion on the cam slider side and a second housing portion on the spring receiving member side in which the middle break prevention means is housed. A two-link base, a lock plate slidable in the direction of the support member while being overlapped and accommodated in the second storage portion, and the first link base and the second link base And a link arm connected to the lock plate so as to be swingable, and a locking piece provided on the lock plate is provided on the support member at a predetermined opening / closing angle of the original pressure plate. The lift member is engaged with the hole to prevent the lift member from being reversed.

  The present invention further includes a first link base housed in the first housing portion on the cam slider side and a second housing portion on the spring receiving member side in which the middle break prevention means is housed. A two-link base, a lock plate provided at a central portion so as to be slidable in the direction of the support member while inserting the second link base in a direction orthogonal to the slit, the first link base, and the first link base A locking arm provided on the support member at a predetermined opening / closing angle of the original cover. The lift member is engaged with the hole to prevent the lift member from being reversed.

  In addition, the present invention is an office machine using the document crimping plate opening / closing device described above between the apparatus main body and the document crimping plate.

  Since the present invention is configured as described above, it is possible to prevent the original crimping plate from being bent at an opening / closing angle equal to or larger than a predetermined opening / closing angle of the original crimping plate and to prevent the middle folding from being prevented. Is housed in each receiving portion of the cam slider and spring receiving member slidably housed in the support member, so that the appearance of the document crimping plate opening / closing device can be seen without the middle break prevention means protruding outside. In addition, since it is no longer necessary to provide a space for accommodating the folding prevention means in the original cover, it is not necessary to change the design of the conventional original cover and use the original one as it is. Furthermore, even if the middle break prevention means is provided, there is an effect that there is no possibility of affecting the strength of the support member.

It is the perspective view which opened and looked at 90 degrees of original pressure-bonding plates of office equipment provided with the original pressure-bonding plate opening and closing device concerning the present invention. 1 is a side view of a document crimping plate opening / closing device according to a first embodiment of the present invention. FIG. 3 is an exploded perspective view of the document crimping plate opening / closing device shown in FIG. 2. FIGS. 3A and 3B are perspective views of a main part of a middle-break preventing unit of the document pressing plate opening / closing device shown in FIG. 2, in which FIG. 2A shows a state before the operation of the lock plate, and FIG. Represents. 2A and 2B show parts of the document crimping plate opening / closing device shown in FIG. 2, in which FIG. 2A is a plan view of a cam slider, FIG. 2B is a bottom view of a spring receiving member, and FIG. FIG. FIG. 3 is a side sectional view of the original cover opening / closing device shown in FIG. FIG. 3 is a side sectional view of the original cover pressing plate opening / closing device shown in FIG. FIG. 4 is a side sectional view for explaining the operation of the middle break prevention means of the original cover pressing device shown in FIG. 2. FIG. 3 is a side sectional view for explaining the operation when a thick original is copied using the original cover pressing device shown in FIG. 2. FIG. 3 is a side cross-sectional view of a state where the original cover is opened up to 75 ° using the original cover opening / closing device shown in FIG. 2. It is a disassembled perspective view of the original cover pressing and closing device of the second embodiment according to the present invention. FIG. 11 is a perspective view of the spring receiving member of the document crimping plate opening / closing apparatus shown in FIG. FIG. 12 is a perspective view of a main part of the middle-break preventing means of the document pressing plate opening / closing device shown in FIG. 11, where (a) is a state before the operation of the lock plate, and (b) is a state after the operation of the lock plate. Represents. FIG. 12 is a side sectional view of the original pressing plate opening / closing apparatus shown in FIG. FIG. 12 is a side sectional view for explaining the operation of the middle folding preventing means of the document pressing plate opening / closing device shown in FIG. 11.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the document crimping plate opening / closing device used for a copying machine or a multifunction device will be described. However, the document crimping plate opening / closing device according to the present invention is a printing machine, facsimile, scanner other than a copying machine or a multifunction device. It is also used for office equipment.

  FIG. 1 shows a copying machine or a multifunction machine (hereinafter simply referred to as a multifunction machine) as an example of office equipment according to the present invention. According to the drawings, a document crimping plate D with an automatic document feeder B is detachably mounted on the main body A of the multifunction peripheral A according to the present invention via a pair of document crimping plate opening / closing devices B and C. It has been. One of the document crimping plate opening / closing devices B and C, to which one of the automatic document feeders B is attached, the document crimping plate opening / closing device B on the left side in FIG. Since the load applied to the original pressure plate opening / closing device B is large, the coil springs constituting the elastic means 12 are superposed on the large and small sizes 12a and 12b, and two superposed ones are used. The document pressing plate opening / closing device C is not shown in the drawing because it is light in weight, but only one coil spring having large and small coil springs with different diameters is used. However, the document crimping plate opening / closing device according to the present invention is basically different in width only and basically has the same configuration. Therefore, in the following description, the document crimping plate opening / closing device B or F on the left side will be described later. The case where the middle break prevention means E or G is provided will be described. When the present invention is applied to the right document pressing plate opening / closing device C, a receiving portion is provided on each side of the spring receiving member and the slider cam, and the folding prevention means is accommodated in each receiving portion. Can be considered.

  FIGS. 2 to 10 are diagrams specifically showing an example of the original cover pressing device B according to the first embodiment of the present invention. The document crimping plate opening / closing device B according to the present invention includes a mounting member 1 attached to the side of the main body A of the multi-function device A, and both side plates 2b, 2b of the mounting member 1 through hinge pins 3. The support member 2 is rotatably connected to the free end of both side plates 2b, 2b of the support member 2 via a connection pin 4 so as to be rotatable in a direction different from that of the support member 2. However, the lift member 6 to which the original cover D is attached, the pressure receiving member 5 provided between the both side plates 1b and 1b of the mounting member 1, and the cam portion 10a is brought into contact with the pressure receiving member 5 so that the inside of the support member 2 is inside. Cam slider 10 held by holding plates 2i and 2i so as to be slidable by hand, operating member 9 provided between both side plates 6b and 6b of lift member 6, and abutting on this operating member 9 A slide slidably housed inside the support member 2 By providing the ring receiving member 11 between the cam slider 10 and the spring receiving member 11, the support member 2 is at least a document pressing plate while the lift member 6 is rotationally biased in a direction overlapping the support member 2. The elastic means 12, 12 for urging in the opening direction of D, and the middle break prevention means E provided between the cam slider 10, the spring receiving member 11, and the support member 2 are configured.

  More specifically, the mounting member 1 includes a mounting base 1a mounted on the apparatus main body A, and an upward direction (including a substantially orthogonal direction) perpendicular to the mounting base 1a from both end portions of the mounting base 1a. The two side plates 1b and 1b that are bent in a bent direction and one end (rear end) of the mounting base 1a are bent in an upward direction (including a direction substantially perpendicular) to the mounting base 1a. And a substantially rectangular rear plate 1c in which a portion is engaged with both side plates 1b and 1b of the mounting member 1. A stopper member 8 for determining the maximum opening angle (60 °) of the support member when the document pressing plate D is opened / closed is attached to the rear plate 1c via mounting screws 8a and 8a as required. In addition, the designation symbols 1d and 1d are hinge pin mounting holes, the designation symbols 1e and 1e are pressure receiving member mounting holes, and the designation symbols 1f and 1f are locking pin insertion holes (not shown). It is.

  The support member 2 includes a back plate 2a, both side plates 2b and 2b bent downward from both ends of the back plate 2a, and a holding plate 2i bent inward from the lower ends of the both side plates 2b and 2b. The two side plates 2b and 2b are rotatably connected to the side plates 1b and 1b of the mounting member 1 by the hinge pins 3 as described above. On the free ends of the side plates 2b and 2b, there are provided guide grooves 2d and 2d into which the lift member 6 is rotatably mounted via the connecting pins 4 and into which both ends of the operating member 9 enter. In addition, the indication symbols 2e and 2e are hinge pin insertion holes, the indication symbols 2f and 2f are connection pin insertion holes, the indication symbols 2g and 2g are locking holes, and the indication symbols 2h and 2h are stopper holes used during assembly.

  The hinge pin 3 is a metal round bar provided with circumferential grooves 3d and 3d at both ends thereof, and passes through the bearing holes 3e and 3e of the bearing members 3a and 3a attached to the hinge pin attachment holes 1d and 1d of the attachment member 1. Then, the hinge pin insertion holes 2e and 2e of the support member 2 are connected to each other, and are prevented from coming off by E-rings 3c and 3c which are locked to the circumferential grooves 3d and 3d via washers 3b and 3b.

  The lift member 6 includes a back plate 6a, both side plates 6b and 6b bent from both ends of the back plate 6a in a downward direction (including a substantially orthogonal direction) perpendicular to the back plate 6a. The mounting plates 6d and 6d are further bent outward from 6b and 6b, and are configured to cover the support member 2. Actuating member mounting holes 6c, 6c are provided on the side of the lift member 6 that is pivotally attached to the connecting pins 4 of both side plates 6b, 6b. The operating member mounting holes 6c, 6c are provided with pin-shaped operating members. 9 is attached, and the document pressing plate D is attached to the attachment plates 6d and 6d. The height adjusting means 7 includes the adjusting screw 7a and the nut 7b attached to the back plate 6a, and finely adjusts the height of the original pressing plate D with respect to the original placing table g (contact glass). The document crimping plate D is uniformly crimped to the upper surface of the document placing table g (contact glass). Further, the instruction symbol 6f is a stopper pin insertion hole.

  The connection pin 4 is a metal round bar having circumferential grooves 4 c and 4 c on both ends, and is inserted into the connection pin insertion holes 2 f and 2 f of the support member 2 and the connection pin mounting holes 6 e and 6 e of the lift member 6. As a result, the lift member 6 is connected to the support member 2, and the E-rings 4 b and 4 b are locked to the peripheral grooves 4 c and 4 c via the washers 4 a and 4 a, thereby being prevented from coming off.

  In the support member 2, the cam slider 10 and the spring receiving member 11 are slidably accommodated by the holding plates 2i and 2i. The cam slider 10 and the spring receiving member 11 are formed in the shape of a bottomed cylinder having a rectangular cross section, and the cam slider 10 is inclined in one direction on the pressure receiving member 5 side on the one end side and has a flat upper surface. A portion 10 a is provided, and a cover 10 b that covers the exposed side of the pressure receiving member 5 is provided. On the side of the actuating member 9 on one end side of the spring receiving member 11, a contact portion 11a is provided so as to protrude. The contact portion 11a is not essential and may be a flat portion on one surface. The cam slider 10 and the spring receiving member 11 are slidably accommodated in the support member 2 so that the openings 10c, 10c and 11b, 11b (only one of them) face each other. The abutment side is in contact with the pressure receiving member 5, and the abutment portion 11 a side of the spring receiving member 11 is in contact with the operating member 9.

  In the embodiment, the working member 9 has circumferential grooves 9b and 9b on both ends, and is inserted into the working member mounting holes 6c and 6c, and the E-rings 9a and 9a are engaged with the circumferential grooves 9b and 9b. By being stopped, it is attached to both side plates 6b, 6b of the lift member 6 so as to be prevented from coming off. The actuating member 9 is a metal round bar. However, in addition to the above embodiment, the actuating member can be configured by providing a top plate on the lift member 6 and bending the top plate inward. The actuating member 9 can be rotatably or fixedly attached between the side plates 6b, 6b.

  Between the cam slider 10 and the spring receiving member 11, both end portions are inserted into the openings 10c, 10c and 11b, 11b (only one is shown) of the cam slider 10 and the spring receiving member 11, and the large diameter Elastic means 12 and 12 comprising coil springs 12a and 12a and small-diameter coil springs 12b and 12b are elastically provided, so that the cam portion 10a is in pressure contact with the pressure receiving member 5 and the contact portion 11a is in pressure contact with the operating member 9. Is in a state. The elastic means 12, 12 may be one or more, for example, two in parallel, or as shown in the drawing, large diameter coil springs 12a, 12a and small diameter coil springs 12b, 12b are superposed. The cam slider 10 and the spring receiving member 11 are urged in directions away from each other.

  The pressure receiving member 5 passes through a metal pressure receiving pin 5a pivoted between both side plates 1b and 1b of the mounting member 1 and an insertion hole 5d provided in the axial direction with respect to the pressure receiving pin 5a. And a synthetic resin slide roller 5b mounted rotatably. The outer shape of the slide roller 5b has a substantially quadrangular cross section, and one surface on the longer diameter side is brought into contact with the flat cam portion 10a of the cam slider 10 with the slide contact portion 5c. Although not shown, lubrication grease is applied to the contact surface between the cam portion 10a and the slide roller 5b. Further, the insertion hole 5d is provided on the lower side of the slide roller 5b, and round portions 5e are provided at each corner. The material of the slide roller 5b is not limited to synthetic resin, but may be sintered metal, ceramic, machined product, or the like.

  The pressure receiving pin 5a may be fixed to the pressure receiving member mounting holes 1e and 1e by caulking both ends thereof, or may be prevented from coming off by using an E-ring. Moreover, you may make it attach to the pressure receiving member attachment holes 1e and 1e so that rotation is possible. Furthermore, the pressure receiving member 5 may be configured such that the pressure receiving pin 5a and the slide roller 5b are integrally or integrally configured and rotatably mounted in the pressure receiving member mounting holes 1e and 1e. Furthermore, the cam portion can be configured in a curved round shape, and the sliding contact portion side on which the slide roller comes into contact with the cam portion can be configured in a surface contact with the round shape of the cam portion.

  The middle break prevention means E has a main body provided between the openings 10c, 10c, 11b, and 11b of the pair of elastic means 12 and 12 in the central portion where the cam slider 10 and the spring receiving member 11 face each other. The first link base 25 housed in the first housing part 10d and the second housing part 11c, and housed in the first housing part 10d on the cam slider 10 side, and the spring receiving member 11 side A second link base 26 and a lock plate 27 which are accommodated in the second storage portion 11c, and a link arm 28 which connects the first link base 25 and the second link base 26 in a swingable manner. It consists of That is, the first link base 25 is a planar rectangular shape having a bent piece 25a on the lower end side, and is connected with a connecting pin 25b. The second link base 26 and the lock plate 27 have a first guide groove 26a and a second guide groove 27a each having a substantially Z-shape with different sizes on each plane portion, and the first and second guide grooves 26a. 27a is accommodated in the second storage portion 11c in a superimposed manner, and a pair of guide protrusions 26b are provided on the second link base 26, and the guide protrusions 26b are guided on the lock plate 27. A pair of guide long holes 27b are provided.

  Further, a bent piece 26e is also provided on the second link base 26, and on the lock plate 27, a locking hole 2c provided on the back plate 2a of the support member 2 is engaged according to the rotation angle of the support member 2. A mating locking piece 27c is provided. The link arm 28 connects the connecting pin 28b provided at one end to the connecting pin 25b provided at the first link base 25, and locks the connecting pin 28b provided at the other end with the second link base 26. By connecting to the first and second guide grooves 26a, 27a of the plate 27, the first link base 25 and the second link base 26 and the lock plate 27 can be connected to be swingable. The first guide groove 26a and the second guide groove 27a have upper grooves 26c and 27d provided upward from the start ends a and c, and lower ends provided downward from the end portions b and d. The direction grooves 26d and 27e are grooves for releasing the connecting pin 25b of the link arm 28.

  Next, the operation of the document crimping plate opening / closing device B according to the first embodiment will be described. Now, as shown in FIGS. 2 and 6, in the state where the original pressure plate D is closed, the original pressure plate D resists the elasticity of the elastic means 12, 12 mainly due to the weight of the original pressure plate D. Closed and kept in a stable closed state. Here, the original pressing plate D can also be urged to rotate in the closing direction by shifting the line of action of the elastic means 12, 12 below the pressure receiving member 5. In this closed state, the slide roller 5b of the pressure receiving member 5 has the sliding contact portion 5c on the long diameter side thereof in surface contact with the cam portion 10a of the cam slider 10, and the elastic means 12 and 12 in the most compressed state are provided. I am receiving elasticity.

  In this closed state, since the facing distance between the cam slider 10 and the spring receiving member 11 is the narrowest, as shown in FIG. The lock plate 27 is rocked at the position of the start ends a and c of the downward grooves 26d and 27e of the first and second guide grooves 26a and 27a of the second link base 26 and the lock plate 27, respectively. The piece 27 c is not engaged with the locking hole 2 c of the support member 2. The state in which the locking piece 27c is not engaged with the locking hole 2c of the support member 2 continues until the opening / closing angle of the original cover D reaches 30 °, as shown in FIGS. When the original pressure plate D is further opened, the facing distance between the cam slider 10 and the spring receiving member 11 is increased, so that the link arm 28 swings at a position connected to the connection pin 25b of the first link base 25 as a fulcrum. The lock plate 27 is moved up to reach the end of the first guide groove 26a of the lock plate 27, and further pushes the lock plate 27 against the second link base 26, so that the locking piece 27c of the lock plate 27 is supported. The engaging hole 2c provided in the member 2 is engaged. Although this opening angle is not shown, it is about 30 ° or more in the first embodiment, but is not limited to this opening angle.

  When the document pressing plate D is further opened from the state in which the locking piece 27c of the lock plate 27 is engaged with the locking hole 2c of the support member 2, as shown in FIG. 10, the second link base 26 and the lock plate Since the positions of the first guide groove 26a of the first guide groove 26a and the downward grooves 26d and 27e of the second guide groove 27a coincide with each other, the link arm 28 enters the connecting pin 28b side and allows the spring receiving member 11 to slide, Further opening operation of the original cover D is allowed. FIG. 10 shows this open state.

  In the opening angle range of the document crimping plate D in which the locking piece 27c of the lock plate 27 is engaged with the locking hole 2c of the support member 2, the sliding operation of the spring receiving member 11 is restricted, Even if it is to be reversed, the reversing operation of the document pressing plate D, that is, the middle folding phenomenon is prevented because the reversing operation cannot be reversed via the connecting pin 4 of the lift member 6. The opening angle of the original pressing plate D that prevents this folding operation is approximately 30 ° to 90 ° in the embodiment. That is, the connecting pin 28b of the link arm 28 is connected to the first and second guide grooves 26a and 26a of the second link base 26 and the lock plate 27 during the opening angle at which the folding operation is prevented, that is, from the opening angle or more. 27a moves toward the end portions b and d of the door 27a, so that the engagement between the locking piece 27c of the lock plate 27 and the locking hole 2c of the support member 2 is maintained. .

  Therefore, when the original pressure plate D is closed with the original pressure plate D opened at an angle larger than the opening angle at which the locking piece 27c of the lock plate 27 engages with the locking hole 2c of the support member 2, it is strongly closed. Even if the operation is performed, the sliding operation toward the closing direction of the spring receiving member 11 is prevented, so that it is possible to prevent the occurrence of the middle folding phenomenon.

  When the document pressing plate D is further closed at an opening angle of approximately 30 ° at which the locking piece 27c of the lock plate 27 engages with the locking hole 2c of the support member 2, the link arm 28 is moved to the first link base 25. Since the connecting pin 25b swings downward with the connecting pin 25b as a fulcrum to disengage the engaging piece 27c of the lock plate 27 and the engaging hole 2c of the support member 2, the spring receiving member 11 can be slid, As a result of allowing the reversal with the connecting pin 4 of the lift member 6 as a fulcrum, it is possible to reverse the original cover D for accommodating a thick original. In addition, after the closing angle of 30 °, the elasticity of the elastic means 12 and 12 is increased, and even if the original pressure plate D is pressed down considerably strongly, the original pressure plate D is inverted and bent. There is nothing.

  Therefore, as described above, the document crimping plate opening / closing device B according to the present invention prevents unnecessary folding operation of the document crimping plate D at the time of opening / closing operation, thereby causing an abnormal opening / closing operation of the document crimping plate D. Can be prevented.

  Next, the function of the slide roller 5b will be described. When the document pressing plate D is opened from the state shown in FIGS. 2, 6 and 7, the contact position of the cam portion 10a of the cam slider 10 with the slide contact portion 5c of the slide roller 5b is higher in the cam portion 10a. Therefore, the original pressing plate D is opened in a state where its original weight is reduced by the elasticity of the elastic means 12, 12. When the hand is released from the opened document pressing plate D, the contact position of the sliding contact portion 5c of the slide roller 5b is urged to slide in one direction by the elastic means 12, 12, and the cam portion 10a of the cam slider 10 is urged. When encountering the frictional resistance moving to the higher side, the rotation pressure generated by the original cover D around the hinge pin 3 via the support member 2, the elasticity of the elastic means 12, 12, and the cam portion of the cam slider 10 The rotational torque created by the slide roller 5b of the pressure receiving member 5 in contact with 10a is balanced. In the embodiment, the original pressure plate D is stably stopped and held at an opening angle of 10 ° or more of the original pressure plate D.

  Next, when closing the opened document pressure-bonding plate D, the slide-contact portion 5c of the slide roller 5b slides toward the higher side of the cam portion 10a against the elasticity of the elastic means 12, 12. However, when a predetermined closing angle, for example, 10 ° is reached, the original pressure-bonding plate D is closed by the pressing force on the original pressure-bonding plate D by the hand, the weight of the original pressure-bonding plate D, and the inertial force. The moment in the closing direction begins to win, and it will be automatically closed even if the hand is released. Since the sliding contact portion 5c of the slide roller 5b and the cam portion 10a of the cam slider 10 are kept in surface contact during the opening / closing operation of the document pressing plate D, the load applied to the cam slider 10 is dispersed and lubricated. Since the grease holding state is maintained, it is possible to prevent an excessive load from being applied to the cam slider 10 and to prevent wear and noise due to the grease being cut off even when used for many years. .

  At this time, if a grease reservoir is provided on the sliding surface between the slide roller 5b and the cam portion 10a of the cam slider 10, the grease holding ability is further improved. This grease reservoir can be provided on one or both of the slide roller and the cam portion. There is no limitation on the shape and position of the grease reservoir.

  When the original is a thick original such as a book, when the thick original is placed on the original placing table g (contact glass) and the original pressing plate D is pressed down, the above-described angle is 30 ° or more. Since the engagement between the locking piece 27c of the lock plate 27 and the locking hole 2c of the support member 2 of the middle break prevention means E is released, both side plates 6b of the lift member 6 rotating around the connecting pin 4 as a fulcrum. The spring receiving member 11 is pushed by the actuating member 9 attached to 6b and slides toward the cam slider 10 against the elastic force of the elastic means 12, 12, and the original cover D is as shown in FIG. Further, the upper surface of the thick original is horizontally covered by rotating the connecting pin 4 together with the lift member 6. Therefore, the document crimping plate opening / closing device B according to the present invention stably crimps the document to the upper surface of the apparatus body i regardless of the thickness of the document. Especially in the case of a thick document, external light is transmitted from the contact glass to the device. Intrusion into the exposure system in the body can be prevented as much as possible.

  FIGS. 11 to 15 show another embodiment of the document crimping plate opening / closing device and office equipment according to the present invention. In the figure, since the configuration other than the middle break prevention means is the same as that of the first embodiment, detailed description thereof is omitted. The same reference symbols denote the same members as those in the first embodiment.

  In the drawing, the middle folding prevention means G of the document pressing plate opening / closing device F according to the second embodiment includes a first receiving portion 10d and a second receiving portion 10d which are provided at the opposed center portions of the cam slider 10 and the spring receiving member 11, respectively. It is accommodated inside the accommodating part 11c, in the first link base 30 accommodated inside the first accommodating part 10d on the cam slider 10 side, and in the second accommodating part 11c on the spring receiving member 11 side. The second link base 31 accommodated, and a lock plate provided in the center portion and inserted through the slit 32a in a direction orthogonal to the second link base 31, and provided with spring insertion holes 32b and 32b on the left and right sides of the slit 32a 32 and a link arm 33 that connects the first link base 30 and the second link base 31 in a swingable manner. In other words, the first link base 30 has a rectangular shape with a bent piece 30a on the lower end side, and has a connecting pin 30b attached thereto. The second link base 31 has a bent piece 31b on one end portion side and a guide groove 31a having a substantially Z shape on the plane portion thereof. On the side of the lock plate 32, guide long holes 32c, 32c, 32c, 32c are provided at four corners. The guide long holes 32c, 32c, 32c, 32c are provided with spring receiving members, particularly as shown in FIG. 11, guide pins 34, 34, 34, 34 with flanges that are attached to the attachment holes 11 d, 11 d, 11 d, 11 d provided at the four corners on the lower surface side are inserted. Further, the link arm 33 connects a connecting hole 33 a provided at one end thereof to a connecting pin 30 b attached to the first link base 30, and connects the connecting pin 33 b provided at the other end to the guide groove 31 a of the second link base 31. , The opening and closing operation of the original cover D is moved between the upward groove 31c and the downward groove 31d of the guide groove 31a, and the second link base 31 is moved to slide the lock plate 32. is there. The reason why the one end side of the slit 32a of the lock plate 32 is cut is to allow sliding for engaging with the support member of the lock plate 32.

  Next, the operations of the document crimping plate opening / closing device F and the folding prevention means G according to the second embodiment will be described. In the closed state of the original cover D shown in FIG. 14, the link arm 33 that constitutes the middle folding preventing means G has the narrowest facing distance between the cam slider 10 and the spring receiving member 11. Therefore, the locking piece 32 d of the lock plate 32 is not engaged with the locking hole 2 c of the support member 2 at the position of the upward groove 31 c of the guide groove 31 a of the second link base 31. The state in which the locking piece 32d is not engaged with the locking hole 2c of the support member 2 continues until the opening / closing angle of the original cover D is 30 ° as in the first embodiment. When the original pressure plate D is further opened from 30 °, the distance between the cam slider 10 and the spring receiving member 11 increases, so that the link arm 33 is connected to the connecting pin 30b of the first link base 30. Since the second link base 31 is slid with respect to the first link base 30, the second link base 31 is slid with respect to the first link base 30. The two link base 31 pushes the lock plate 32, and the engaging piece 32d continues to engage with the engaging hole 2c provided in the support member. FIG. 15 shows a state where the original cover D is further opened as described above. The opening angle is 30 ° or more in the embodiment, but is not limited to this opening angle.

  When the locking piece 32d of the lock plate 32 reaches the opening angle of the original pressure plate D that engages with the locking hole 2c of the support member, the sliding operation of the spring receiving member 11 is restricted, and the original pressure plate D is to be reversed. However, since the reversing operation cannot be reversed via the connecting pin 4 of the lift member 6, the reversing operation of the document crimping plate D, that is, the middle folding operation does not occur. The opening angle of the original pressing plate D that prevents the folding operation is between 30 ° and 90 ° in the embodiment. Since the connecting pin 33b of the link arm 33 moves to the downward groove 31d of the guide groove 31a of the second link base 31 from the opening angle at which the middle folding operation is prevented, the locking piece 32d of the lock plate 32 and the support member As a result, the reversal of the original pressure plate D is prevented.

  Therefore, when the original pressure plate D is opened with the locking piece 32d of the lock plate 32 being opened more than the opening angle at which the locking piece 32d of the support member 2 is engaged with the locking hole 2c, it is strongly closed. Even if the operation is performed, the sliding operation toward the closing direction of the spring receiving member 11 is prevented, so that it is possible to prevent the occurrence of the middle folding phenomenon.

  When the document pressing plate D is further closed from the opening angle of 30 ° where the locking piece 32d of the lock plate 32 is engaged with the locking hole 2c of the support member 2, the link arm 33 is moved to the first link base. Since the connection pin 30b of 30 is swung downward by its own weight and the engagement between the locking piece 32d of the lock plate 32 and the locking hole 2c of the support member 2 is released, the sliding operation of the spring receiving member 11 As a result, inversion with the connecting pin 4 of the lift member 6 as a fulcrum is allowed, the original crimping plate D for handling thick originals can be inverted. Further, since the elasticity of the elastic means 12 is increased after the closing angle of 30 °, the force for rotating and energizing the lift member 6 through the pressure receiving member 20 in the direction not to be reversed is increased, and the document is considerably strong. Even if the pressure-bonding plate D is pressed down, the original pressure-bonding plate D is not inverted and bent.

  Therefore, as described above, the folding prevention means according to the present invention prevents unnecessary folding phenomenon during the opening / closing operation of the document crimping plate without impairing the appearance of the conventionally known document crimping plate opening / closing device. Therefore, it is possible to prevent an abnormal opening / closing operation of the original pressure bonding plate D. Therefore, the original pressure bonding plate opening / closing device of an office machine such as a copying machine, a printing machine, a printing machine, a facsimile machine, a scanner, or the like is used. It is suitably used for office equipment.

A MFP B Main body B, C, F Document crimping plate opening / closing device D Document crimping plate E, G Middle folding prevention means 1 Mounting member 1a Mounting base 1b Both side plates 2 Support member 2a Back plate 2b Both side plates 2c Locking hole 2g Locking hole 3 Hinge pin 4 Connecting pin 5 Pressure receiving member 6 Lift member 6a Back plate 6b Both side plates 9 Actuating member 10 Cam slider 10a Cam portion 10d First receiving portion 11 Spring receiving member 11c Second receiving portion 12a Large diameter coil spring 12b Small-diameter coil spring 20 Pressure-receiving member 25 First link base 25b Connection pin 26 Second link base 27 Lock plate 27c Locking piece 28 Link arm 28b Connection pin 30 First link base 30b Connection pin 31 Second link base 32 Lock plate 32a Slit 32d Locking piece 33 Link arm 3 b connecting pin

Claims (7)

  A mounting member attached to the apparatus main body side, a support member whose both side plates are rotatably connected to both side plates of the mounting member via hinge pins, and a free pin side of the both side plates of the support member via a connection pin; A lift member for attaching the original cover, which is pivotally mounted so as to be rotatable in a direction different from the support member, an actuating member provided at a position of turning about the connecting pin of the lift member, and the attachment A pressure receiving member that is pivoted between both side plates on the member side, and a cam slider and a spring receiver that are slidably accommodated in the support member while acting elastic means between the pressure receiving member and the operating member In the structure comprising the members, the middle break prevention means is provided by being accommodated inside the accommodation portions provided for the cam slider and the spring receiving member, respectively. Original cover closer.   A mounting base and both side plates raised from both sides of the mounting base; a mounting member for mounting the mounting base to the apparatus body side; and at least a back plate and side plates bent from the back plate. A support member rotatably connected to both side plates of the mounting member via hinge pins, a back plate and both side plates bent from the back plate, and a connection pin is provided on the free end side of the both side plates of the support member. A lift member to which the original cover is attached so that both side plates can be rotated in a direction different from that of the support member, and the lift member on the side of the shaft attachment portion with respect to the support member. An actuating member provided at a position where the connecting pin pivots around a fulcrum when the lift member rotates, a pressure receiving member pivoted between both side plates on the mounting member side, and a cam portion abutting against the pressure receiving member The support part A cam slider slidably accommodated therein, a spring receiving member slidably disposed in contact with the operating member on a free end side in the support member, the cam slider and the spring A coil spring that urges the supporting member in at least the direction of opening the original pressing plate while rotating and urging the lift member in a direction overlapping with the supporting member by being elastically provided between the receiving member and the original pressing plate; Intermediate folding prevention means for preventing the original crimping plate from being folded at a predetermined opening / closing angle of the original, and the middle folding prevention means to the inside of the receiving portion provided respectively for the cam slider and the spring receiving member. It is provided so as to be disposed, and acts on the lift member to prevent its reversal at a predetermined opening / closing angle or more of the original pressure plate. Original cover closer.   The intermediate folding prevention means is configured to act on the lift member via a spring receiving member to prevent the original crimping plate from being folded in a predetermined opening / closing angle range. The document crimping plate opening and closing device according to claim 1 or 2.   In the predetermined opening / closing angle range of the original document crimping plate, the folding prevention means acts on the spring receiving member in the predetermined opening / closing angle range of the original document pressing plate to restrict the pressing operation against the operating member. 3. The document crimping plate opening / closing device according to claim 1, wherein the document crimping plate is prevented from being bent.   The middle break prevention means includes a first link base housed in a first housing portion on the cam slider side, a second link base housed in a second housing portion on the spring receiving member side, A lock plate that is slidable in the direction of the support member while being superimposed on the second link base and accommodated in the second housing portion, and the first link base, the second link base, and the lock plate A locking arm provided on the lock member and engaged with a locking hole provided on the support member at a predetermined opening / closing angle or more of the original pressing plate. 3. The document crimping plate opening / closing apparatus according to claim 1, wherein the lift member is prevented from being reversed. 4.   The middle break prevention means includes: a first link base housed in a first housing portion on the cam slider side; a second link base housed in a second housing portion on the spring receiving member side; A lock plate provided so as to be slidable in the direction of the support member while inserting the second link base in a direction orthogonal to a slit provided in a central portion; and the first link base and the second link base; The locking piece provided on the lock plate is engaged with the locking hole provided on the support member at a predetermined opening / closing angle or more of the original cover. 3. The document crimping plate opening and closing device according to claim 1, wherein the lift member is prevented from reversing. 4.   An office machine characterized in that the document crimping plate opening / closing device according to any one of claims 1 to 6 is used between an apparatus main body and a document crimping plate.

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