TWI444752B - Original press plate opening and closing device and office equipment with original platen - Google Patents

Description

Original platen opening and closing device and office equipment with original platen

The present invention relates to an original platen switch device, and more particularly to an original platen opening and closing device suitable for use in an office equipment having a document platen such as a photocopier, a printing machine, a facsimile machine, a scanner, and the like, and a document platen having the same office equipment.

On the main body of the office equipment such as a photocopier, a printing machine, a facsimile machine, a scanner, etc., the original platen is openably and closably mounted on the rear surface of the upper surface of the apparatus main body via the original platen switch device, and the original platen covers the original of the apparatus main body The upper surface of the glass. The original platen switch device is a hinge mechanism whose shaft supports the original platen so that the original platen can be rotated about the hinge axis, so that the original platen can be brought into close contact with the original platen glass on the upper surface of the apparatus main body, and the original platen glass can be exposed.

In order to mount the original on the original glass, open the original pressure plate (move the original pressure plate in a direction away from the original glass (sometimes called the opening direction), expose the upper surface of the original glass, and place the original on the original After the original glass is placed on the original glass, the original pressure plate is closed, and the original is pressed against the original glass.

In such a document platen opening and closing device, such a document platen opening and closing device is known, and the original platen can be opened by the urging force of the compression spring, and the original platen can be opened (see, for example, Patent Document 1). The original platen opening and closing device has a mounting member mounted on the apparatus main body of the office equipment via a hinge A pin rotatably provided to the mounting member, and a support member attached to the original platen and a compression spring biasing the support member in the opening direction. Since the original platen is rotatably biased in the opening direction by the support member by the compression spring, when the original platen is rotated in the opening direction, the original platen can be opened without the original weight being felt by the urging force of the compression spring.

Patent Document 1: Japanese Patent No. 3262457

In the original platen opening and closing device described in Patent Document 1, when the original platen is closed (rotated in the closing direction), it is necessary to apply force to the compression spring force first, and the original plate is biased by the compression spring in the middle. The force increases the rotational moment at which the original platen is to be closed, so that the original platen can be easily closed, but in the case where the original platen is loaded with the automatic document feeder and has a weight, there is a fear that the original platen rotates faster. Thus, the original platen violently hits the original glass.

However, various methods such as providing a damper device are employed, but both of them cause an increase in manufacturing cost or a poor operation feeling when the original platen is opened and closed, so that an original platen opening and closing device with a brake function is sought without increasing The production cost and structure are simple, and the feeling of opening and closing operations is not affected.

Therefore, how to solve the above problems and problems in the past, that is, the inventors of this case and the relevant manufacturers engaged in this industry are eager to study the direction of improvement.

Accordingly, in order to effectively solve the above problems, the main object of the present invention is to provide a brake work that can be performed by a simple structure that does not increase the manufacturing cost. An original platen opening and closing device that has a good sense of operation and an office equipment having an original platen.

In order to achieve the above object, the original platen opening and closing device of the present invention includes a mounting member, a support member, a slider, a cam member, and an elastic member, the mounting member being on the apparatus main body side of the office equipment having the original platen, the support member being Rotatingly mounted on the mounting member and supporting the original platen, the slider is slidably disposed in one of the support member and the mounting member, the cam member being disposed on the other side of the support member and the mounting member, and The sliding member is in sliding contact with the slider, and the elastic member is disposed between the slider and the supporting member or the mounting member, the elastic member presses the slider into contact with the cam member, and controls an opening operation of the original pressing plate, and the above One of the slider and the cam member is provided with a fitting recess, and the other of the inserting projections is fitted to the fitting recess, and at least one of the fitting recess and the inserting projection is provided with a rotation control portion. When the support member rotates relative to the mounting member, frictional torque is generated in the middle of the rotation to control the original Platen opening and closing operation.

According to the invention, the fitting recessed portion is provided in one of the slider and the cam member, and the insertion convex portion that is fitted to the fitting recessed portion is provided on the other of the slider and the cam member, and the fitting recessed portion and the insertion convex portion are provided. At least one of the portions is provided with the rotation control unit, and when the support member is rotated with respect to the attachment member, a friction torque is generated in the middle of the rotation, and the opening and closing operation of the original platen is controlled. Due to the above configuration, the original platen is formed on the device. a rotation control portion that generates a friction torque near the upper surface of the main body, so that there is no fear that the original platen is violently hit Go to the device body. Further, by forming the rotation control unit, it is possible to improve the operational feeling when the original platen is opened and closed. As a result, it is possible to obtain an original platen opening and closing device that does not increase the manufacturing cost, has a simple structure, and exhibits a good braking function and a good operational feeling.

In the original platen opening and closing device of the present invention, preferably, the fitting recess has an engaging groove portion extending in a sliding direction along the sliding direction of the slider, and the insertion convex portion has a locking tab edge. The sliding direction of the slider extends and protrudes, and a portion of the engaging tab is widened to form the rotation control portion. Further, in the original platen opening and closing device of the present invention, preferably, the fitting recessed portion has the engaging groove portion extending in a sliding direction of the slider to form a slit shape, and a part of the engaging groove portion The width of the portion is narrowed to form the above-described rotation control portion.

Further, in the original platen opening and closing device of the present invention, preferably, the fitting recess has an engaging groove portion extending in a sliding shape along a sliding direction of the slider, and the slit-shaped cross section is concave. The rotation control portion is formed by projecting a part of the bottom portion of the engagement groove portion. Further, in the document platen opening and closing device of the present invention, it is preferable that one or two or more of the fitting concave portion and the insertion convex portion are provided. Further, in the original platen opening and closing device of the present invention, it is preferable that the slider and the cam member are respectively formed in a cam shape, and when the support member is rotated relative to the mounting member, the mounting member and the support are provided The support members are biased in the opening direction between the members, and a friction torque is generated to stop the aforementioned original platen in a free stop manner with respect to the apparatus body.

Further, in the original platen opening and closing device of the present invention, it is preferable that the rotation control unit is provided when the original platen is located near an upper surface of the apparatus main body and the original platen is in an upright state with respect to the apparatus main body. The friction torque or the rotation control unit is provided when the document pressing plate is located near the upper surface of the apparatus main body or the document pressing plate is in a state of being in an upright state with respect to the apparatus main body to generate a friction torque. Further, in the original platen opening and closing device of the present invention, it is preferable that the mounting member has a bottom plate that is surface-mounted on the apparatus main body, and two side plates that rise from both side portions of the bottom plate, the support member via the support member A hinge pin is rotatably mounted to the side plates, and the cam member is mounted between the two side plates.

Further, in the original platen opening and closing device of the present invention, preferably, the attachment member has a leg portion which is provided in a mounting hole of the apparatus main body in an up-and-down direction, and the leg portion is vertically movable Insert into the above mounting hole. Further, in the original platen opening and closing device of the present invention, it is preferable that the leg portion is formed in a tubular shape, and the slider and the elastic member that slidably bias the slider in one direction are provided inside. Further, in the original platen opening and closing device of the present invention, preferably, the free end of the support member is attached with a lifting member, the lifting member and the supporting member are rotatable in direction, and the rotating direction thereof is different from the supporting member. The aforementioned original platen is attached to the lifting member.

Further, in the original platen opening and closing device of the present invention, preferably, the attachment member has a rotation restricting portion, a base portion of the rotation restricting portion is on an upper end side of the leg portion, and the support member has a restricting portion and The rotation limit The department abuts.

Further, in order to achieve the above object, an office equipment having a document platen of the present invention is characterized by comprising the above-described document plate opening and closing device of the present invention. According to the present invention, in the same manner as described above, the fitting concave portion is provided in one of the slider and the cam member, and the insertion convex portion fitted to the fitting concave portion is provided in the other, and rotation control is provided in at least one of the fitting concave portion and the insertion convex portion. When the support member is rotated relative to the attachment member, frictional torque is generated in the middle of the rotation, and the opening and closing operation of the original platen is controlled. With the above configuration, the production cost can be increased, the structure can be simplified, and the brake function and the operation feeling can be exhibited. Good original platen opening and closing device.

According to the document plate opening and closing device of the present invention and the office equipment having the document platen as described above, the fitting recess is provided in one of the slider and the cam member, and the insertion convex portion of the fitting recess is provided in the other, and the fitting recess and the fitting recess are provided. At least one of the insertion convex portions is provided with a rotation control portion, and when the support member is rotated with respect to the attachment member, friction torque is generated in the middle of the rotation, and the opening and closing operation of the original pressure plate is controlled, and the above configuration can be obtained without increasing the cost and having a simple structure. An original platen opening and closing device that has a good braking function and a good operational feeling.

The detailed description of the present invention and the accompanying drawings are intended to be understood as

The above object of the present invention, as well as its structural and functional features, will be described in accordance with the preferred embodiments of the drawings.

In the following description, a case will be described in which a document platen opening/closing device having a structure in which a slider has a lifting function and a slider and an elastic device are not provided in the leg portion, but the present invention may be implemented as described later. An original platen opening and closing device having a structure other than the structure described in the following embodiments.

The invention relates to an original platen opening and closing device and an office equipment having an original platen. 1 to 3 are views showing an example of an original platen opening and closing device of the present invention. Referring to the first, second, and third embodiments, the original platen opening and closing device of the present invention can open and close the original platen 12 to the rear end portion of the apparatus main body 11 of the office equipment 10. The office equipment 10 is not particularly limited, and is, for example, a photocopier, a printer, a facsimile machine, a scanner, etc., and the above-described photocopier is particularly preferred, but is not particularly limited.

The original platen opening and closing device 1 of the present invention is provided with a mounting member 2 mounted on the apparatus main body 11 side of the office equipment 10 having the original platen 12, and rotatably pivoted by a hinge pin 16. a support member 3 mounted on the mounting member 2 and supporting the original platen 12; slidably provided in either one of the support member 3 and the mounting member 2, for example, a slider 5 provided in the support member 3; The slider 5 is in sliding contact and is disposed on the other side of the support member 3 and the mounting member 2, for example, the cam member 6 provided on the mounting member 2; and an elastic member 17 is disposed between the slider 5 and the supporting member 3, The slider 5 is pressure-contacted to the cam member 6, and the opening operation of the original platen 12 is controlled. The original platen opening and closing device 1 forms a closed state in which the original platen 12 is rotated and the upper surface of the apparatus main body 11 is covered by the original pressing plate 12. And an open shape that exposes the upper surface of the apparatus body 11 state.

In the original platen opening and closing device 1 of the present invention, one of the slider 5 and the cam member 6 is provided with, for example, an insertion convex portion 8 on the cam member 6, and the other of the slider 5 and the cam member 6 is, for example, A fitting recess 7 that is fitted into the insertion convex portion 8 is provided in the slider 5, and a rotation control portion 9 is provided on at least one of the fitting recess 7 and the insertion convex portion 8, and the supporting member 3 is opposed to the mounting member. When the rotation is 2, the friction torque is generated in the middle of the rotation, and the opening and closing operation of the original platen 12 is controlled.

The upper surface of the apparatus main body 11 is provided with an original glass (not shown), and the original is pressed against the original glass by the original pressing plate 12, and the original glass is shielded by the original pressing plate 12. At two places in the vicinity of the rear end portion of the upper surface of the apparatus main body 11, a mounting hole 13 extending in the up and down direction (sometimes referred to as a height direction) and having a concave shape is formed, and the cross section of the mounting hole 13 is formed as a rectangular shape; and a movement permitting recess 14 extending in the height direction is provided on the rear surface of the mounting hole 13, and the length of the movement permitting recess 14 in the height direction determines the range of movement of the original platen opening and closing device 1 in the height direction, It is not particularly limited and can be arbitrarily set.

Next, as shown in FIGS. 1 to 4, the mounting member 2 has a base portion 21, a leg portion 25 extending downward from the lower surface of the base portion 21, and a rotation provided on the upper surface of the base portion 21. Part 22. The mounting member 2 is formed of a synthetic resin, but is not limited thereto and may be formed of other materials.

The base portion 21 is formed in a substantially rectangular flat plate shape. Under the base 21 A leg portion 25 is formed extending downward from the surface, the cross section of the leg portion 25 is formed to be smaller than a slightly rectangular shape of the base portion 21, the leg portion 25 is inserted into the mounting hole 13 of the apparatus main body 11, and the original platen opening and closing device 1 is attached to the apparatus main body 11 . On the upper surface of the four faces (front surface, rear surface, and both side faces) of the leg portion 25, a plurality of guide pieces 25a are provided, and a lower portion of the rear surface of the leg portion 25 is provided with a lower rectangular surface which is slightly rectangular The convex portion 26. When the leg portion 25 is inserted into the mounting hole 13, the convex portion 26 is engaged with the movement permitting concave portion 14, and the support portion is in a range before the abutment portion of the movement permitting recess portion 14 abuts. The leg portion 25 of the 2 is the original platen opening and closing device 1 and is movable in the height direction. In addition, the front surface of the leg portion 25 is inclined downward and formed into a tapered surface 25b. When the convex portion 26 abuts or approaches the upper end portion of the movement permitting concave portion 14, the leg portion 25 is reversed to the rear surface side. Then, the tapered surface 25b is in surface contact with the front wall of the mounting hole 13 or close to the front wall of the mounting hole 13, and the convex portion 26 is separated from the movement permitting recess 14, and the leg portion 25 can be pulled out by the mounting hole 13.

The rotating portion 22 has a slightly smaller cross section in the planar direction than the base portion 21, and the rectangular shape has a substantially rectangular parallelepiped shape. On the rear side of the rotating portion 22, a shaft hole 22a penetrating both side faces is provided. The hinge pin 16 is inserted into the shaft hole 22a via a bearing 28. The cam member 6 that is in sliding contact with the slider 5 in a state where the slider 5 is pressed is formed from the front surface to the upper surface of the rotating portion 22. A corner portion of the front surface and the upper surface of the cam member 6 is formed in a curved shape. Further, the upper surface (upper end) of the side surfaces of the rotating portion 22 on both side surfaces of the base portion 21 is formed into a two-stage structure having a high front surface. The aforementioned formation of the 2-stage structure The wall portion is inclined and forms a rotation restricting portion 23.

The support member 3 is formed of a synthetic resin, but is not limited thereto, and may be formed of another material. Referring to FIGS. 1 to 3, the support member 3 is formed in a rectangular tubular shape by an upper plate 3a, a side plate 3b, and a lower plate 3c. One end portion of the support member 3 is closed to be formed as an elastic member support portion 3d, and the other end portion of the support member 3 is opened.

The side plates 3b are respectively provided with attachment pieces 3e, 3f attached to the rear end side of the original platen 12 by screws or the like, and the ends of the side plates 3b are extended to form a rotating piece 31 between the rotating pieces 31. The length is formed to be longer than the length between the both side portions of the rotating portion 22 of the mounting member 2, for example, a slightly longer dimension. A shaft insertion hole 32 through which the hinge pin 16 is inserted is disposed on the rotating piece 31. The shaft insertion hole 32 of the rotating piece 31 is aligned with the shaft hole 22a of the mounting member 2, and the hinge pin 16 is passed through A washer or the like is inserted through the holes 32, 22a, and the support member 3 is rotatably coupled to the mounting member 2 with the hinge pin 16 as a shaft.

The front end portion of the rotating piece 31 abuts against the rotation restricting portion 23 of the attachment member 2 when the original pressing plate 12 is opened (rotated in the opening direction) (see FIGS. 2(b) and (c)), and the rotating piece The front end portion of the 31 is formed as a restricting portion 33 that restricts the range of rotation of the original platen 12. In addition, the opening direction in the present invention means a direction in which the original platen 12 is separated from the original platen glass when the original platen 12 is rotated. In the present invention, the closing direction means a direction opposite to the opening direction, and refers to a direction in which the original pressing plate 12 approaches the original table glass when the original pressing plate 12 is rotated.

The elastic member 17 biases the original platen 12 in the opening direction, that is, biases in the opening direction. The elastic member 17 is not particularly limited and may be a compression spring 17a housed in the support member 3 and elastically disposed between the elastic member support portion 3d and the cam member 6, the compression spring 17a One end portion is supported by the elastic member support portion 3d, and the other end of the compression spring 17a is housed in the slider 5, and is abutted against the cam member 6 via the slider 5. That is, the compression spring 17a presses the slider 5 into contact with the cam member 6, and urges the original platen 12 in the opening direction. However, the number of the compression springs 17a is not particularly limited, and may be one or two or more, and is one in the illustrated example.

The slider 5 is formed of a synthetic resin, and is not particularly limited, and may be formed of another material. As shown in FIGS. 3 and 5, the slider 5 is housed in the support member 3, and the support is closed. In the member 3, the slider 5 is formed in a rectangular bottomed cylindrical shape, and has a circular shape formed therein as a spring accommodating portion 5b, and the other end portion of the compression spring 17a is housed in the spring accommodating portion 5b. The bottom portion of the slider 5, that is, the abutting portion 5a is in contact with the cam member 6. The abutting portion 5a is provided with a sliding portion 51 that is in sliding contact with the cam member 6. The shape of the cam member 6 is preferably such that when the original pressing plate 12 is rotated in the axial opening direction of the hinge pin 16, the original pressing plate 12 is gradually raised, and the force of the original pressing plate 12 falling in the closing direction due to its own weight is weakened. With this action, the compression spring 17a is stretched, the force thereof is also weakened, and the original platen 12 does not jump.

The fitting recess 7 and the insertion protrusion 8 are fitted to each other, and the fitting recess 7 can be disposed on both the cam member 6 and the slider 5, and is preferably provided. One of the cam member 6 and the slider 5 is provided, for example, on the slider 5. In the fitting recessed portion 7 , a slit-shaped engaging groove portion is formed in a portion from a top side to a lower portion (including the sliding portion 51 ) in a height direction (sliding direction) of a substantially central portion of the abutting portion 5 a of the slider 5 . 71. The width of the engagement groove portion 71 is formed to be substantially the same.

The insertion convex portion 8 is disposed opposite to the fitting concave portion 7 and can be disposed on both the cam member 6 and the slider 5, and is preferably disposed on either one of the cam member 6 and the slider 5, for example, disposed on the cam member 6. . The insertion convex portion 8 is, for example, an insertion tab 81 that extends in the sliding direction of the slider 5 and protrudes, for example, at a substantially central portion of the cam member 6 from a portion from the upper surface to the lower portion of the front surface. . The width of the insertion tab 81 is formed to be narrower than the width of the engaging groove portion 71.

The rotation control unit 9 is configured to generate a friction torque during the rotation of the support member 3 relative to the attachment member 2 to control the rotational speed of the original platen 12, and the rotation control unit 9 may be disposed in the fitting recess 7 Both of the insertion convex portion 8 and the insertion convex portion 8 are preferably provided on one of the fitting concave portion 7 and the insertion convex portion 8, for example, in the insertion convex portion 8 (insertion tab 81). The rotation control unit 9 is not particularly limited as long as it can control the rotational speed of the original platen 12, and can be formed, for example, by widening the width of the insertion tab 81. The width of the rotation control portion 9 is preferably formed to be approximately the same as or slightly wider than the width of the engagement groove portion 71. The boundary between the rotation control portion 9 and the insertion tab 81 can be formed in a stepped shape, and is preferably formed obliquely. That is, it is preferable to gradually widen the width of the insertion tab 81 to form the rotation control portion 9, the rotation control portion 9 The position is arbitrarily determined, for example, at a portion of a portion at a substantially central portion in the height direction of the front surface of the cam member 6, so that the frictional torque is generated in the vicinity of the apparatus main body 11 with the original platen 12.

The operation of the original platen opening and closing device 1 and the office equipment 10 of the present invention will be described below.

The original platen 12 is in close contact with the original glass of the apparatus main body 11 in a state where the apparatus main body 11 is not in use, and the original glass is shielded. At this time, the engagement groove portion 71 is engaged with the insertion tab 81. In order to place the document on the original glass, first, the end portion of the original platen 12 on the side opposite to the portion on which the original platen opening and closing device 1 is attached is held, or the original platen 12 is lifted upward. That is, the original platen 12 is rotated about the hinge pin 16, and the upper surface of the original platen glass is exposed to the outside, and the original platen 12 is placed at the open position. At this time, as shown in FIGS. 2(b) and 2(c), since the regulating portion 33 of the supporting member 3 abuts against the rotation restricting portion 23 of the mounting member 2, the original platen 12 can be positioned at the maximum open position without excessive turn on. Further, when the original platen 12 is rotated, the original platen 12 is biased in the opening direction by the urging force of the compression spring 17a, and can be rotated in the opening direction without feeling the weight. Further, the engagement groove portion 71 is fitted and engaged with the insertion tab 81, and in this state, the support member 3 (original pressure plate 12) is rotated with respect to the attachment member 2.

After the original is placed on the exposed glass surface of the original table, the raised original platen 12 is lowered. That is, the document pressing plate 12 is rotated in the closing direction in contact with the original table glass with the hinge pin 16 as an axis and moved downward to be closed. status. At this time, in order to resist the urging force of the compression spring 17a, it is necessary to apply a force, and by the urging force of the original platen 12 by the compression spring 17a in the middle, the moment of the original platen 12 is increased, so that the original platen can be easily rotated. 12. Further, when the original platen 12 is further rotated, the rotational speed of the original platen 12 is increased, and both side faces of the rotation control portion 9 are in sliding contact with the side wall portions of the engaging groove portion 71, and frictional torque is generated, and the rotational speed of the original platen 12 is generated. reduce. As a result, there is no fear that the original platen 12 will violently hit the original glass. If the original placed on the original glass is a thin object, for example, a thin paper, the original pressing plate 12 is rotated only by the hinge pin 16, and the original is not lifted from the original glass by the original pressing plate 12, but is tight. It is attached to the original glass, so that the original can be copied well.

In the case where the original is thicker than a book, after the original is placed on the original glass, the original pressing plate 12 is rotated in the closing direction, and before the original pressing plate 12 is closed, that is, the original pressing plate 12 and the original platen Before the glass is pressed, the original platen 12 comes into contact with the end portion of the document, and a space is formed between the end portion on the side opposite to the end portion of the document and the original platen 12. In other words, the document platen 12 is in a state in which the end portion on the opposite side of the document platen opening and closing device 1 is floated. The original platen 12 on the floating side is pressed toward the apparatus main body 11 or the leg portion 25 is moved in the direction (upward) from the attachment hole 13 by the weight of the original platen 12, and the original platen opening and closing device 1 is moved upward. And the original platen 12 is rotated about the hinge pin 16. That is, the height of the original platen opening and closing device 1 is automatically adjusted, and the original platen 12 is moved to cover the upper portion of the original. For example, in the case where the upper portion of the original is a flat surface, the original platen 12 and the upper portion Make face contact. As a result, the thicker original is stably attached to the original glass. Thereby, regardless of the thickness of the original document, the original platen 12 can stably adhere the original to the original glass, and can prevent the external light from intruding into the inside of the apparatus main body to hinder the exposure.

In this manner, since the original platen 12 is rotated in the closing direction and close to the original platen glass, the both side faces of the rotation control portion 9 are in sliding contact with the side wall portions of the engaging groove portion 71, and frictional torque is generated, so that the rotational speed of the original platen 12 is generated. Lower, the original platen 12 does not violently hit the original glass. In addition, when the original platen 12 is rotated in the opening direction from the state in which the original platen 12 is closed, in the state where the original platen 12 is slightly raised by hand, even if the hand releases the original platen 12 at a certain moment, the two of the rotation control portions 9 are rotated. Since the side surface is in sliding contact with both side wall portions of the engaging groove portion 71 to generate frictional torque, there is no fear that the original platen 12 will violently hit the original glass at the moment of letting go.

Further, since the rotation control portion 9 is formed by gradually widening the width of the insertion tab 81, the friction torque is not suddenly generated in the middle of the rotation of the original platen 12, and the frictional torque is gradually increased, so that the original platen 12 is opened and closed. The sense of operation is good.

Therefore, the original platen opening and closing device 1 and the office equipment 10 of the present invention have a simple structure, do not increase the manufacturing cost, exhibit a braking function at low cost, and can also have a good operational feeling, and the office equipment 10 can be used with confidence.

In the above embodiment, the rotation control unit 9 is formed in the insertion convex portion 8 (insertion tab 81). However, the present invention is not limited thereto, and may be provided in the fitting recess 7 as shown in FIG. Slot portion 72). The rotation in the second embodiment The motion control unit 91 is preferably formed to gradually reduce the width of the side portion of the engagement groove portion 72, and is formed, for example, in a size substantially the same as or slightly narrower than the width of the insertion tab 82 (see FIG. 7). Further, as shown in FIG. 7, the insertion fins 82 are formed to have substantially the same width.

Thus, similarly to the case where the rotation control unit 91 is formed in the insertion convex portion 8 (insertion tab 81), when the support member 3 is rotated relative to the attachment member 2, friction torque is generated in the middle of the rotation thereof, and controllable The opening and closing operation of the original platen 12 is simple in structure, does not increase the manufacturing cost, exhibits a braking function at low cost, and also has a good operational feeling. In addition, although not shown in the figure, the shape of the fitting recessed portion (engagement groove portion) may be formed into a wedge shape in the depth direction of the cam member 6 and the slider 5 provided with the fitting recessed portion, in addition to the drawings. With the opening and closing operation of the original platen, a braking action can be generated between the insertion convex portion (insertion tab) and the fitting concave portion (engagement groove portion).

Further, the rotation control unit 9 is provided at one position of the insertion tab 81, but is not limited thereto, and may be provided in two or more places. In the third embodiment, for example, as shown in FIG. 8, the rotation control unit 9 can be provided at two places. Thereby, frictional torque is generated at two places in the middle of the rotation of the original platen 12, and the opening and closing operation of the original platen 12 can be controlled.

Further, although one set of the fitting recessed portion 7 and the insertion convex portion 8 are provided, the present invention is not limited thereto, and two or more sets may be provided. In the fourth embodiment, for example, as shown in FIG. 9, two insertion tabs 81 having the rotation control portion 9 are provided in the cam member 6, and, as shown in FIG. 10, the insertion tab 81 is provided. The fitting recess 7 (the engaging groove portion 71) is provided at two places of the opposing slider 5. Thereby making When the support member 3 is rotated with respect to the attachment member 2, frictional torque is generated by the two sets of fitting recesses 7 and the insertion projections 8 during the rotation, and the opening and closing operation of the original platen 12 can be surely controlled, and the structure is simple and the production is not increased. The cost can be used at a low cost, and the operation feeling can be improved.

In addition, the case where the original platen opening and closing device 1 is attached to the apparatus main body 11 by the leg portion 25 has been described, but the invention is not limited thereto. In the fifth embodiment, for example, as shown in FIG. 11, the mounting member 102 can be mainly detachably attached to the bottom plate 121 of the apparatus main body, and is orthogonal to the bottom plate 121 from both end portions of the bottom plate 121, respectively. The direction (also including the substantially orthogonal direction) is composed of two side plates 122 that extend (erect) and face each other, and a cam member 106 that is disposed between the side plates 122. Further, in this case, the lifting member 104 may be provided.

That is, the cam member 106 is provided with an insertion convex portion 8 (insertion tab 81) having a rotation control portion 9 and disposed between the side plates 122 via a mounting pin 115. The hinge pin 116 is provided to penetrate the both side plates 122 and the cam member 106. A support member 103 is rotatably mounted on the mounting member 102 with the hinge pin 116 as a shaft. In the support member 103, two sliders, that is, a first slider 108 and a second slider 105 having a fitting recess 7 (engagement groove portion 71) having substantially the same configuration as the slider 5 are provided. Between the first slider 108 and the second slider 105, a compression spring 117a as an elastic member 117 that biases the document holding plate 12 in the opening direction, that is, biases in the opening direction, is housed. The lifting member 104 is supported on a support member 103 that coincides with the support member 103 and may be on the free end side of the support member 103 The lift pin 118 is pivoted. The lifting member 104 is mounted on the original platen 12. The lifting member 104 is provided with the work pin 119. When the first slider 108 abuts against the work pin 119, the original can be stably adhered to the original glass regardless of the thickness of the original, and external light can be prevented as much as possible. Intrusion into the inside of the main body of the apparatus hinders the exposure, and the configuration can also be simplified, the manufacturing cost can be increased, the braking function can be exhibited inexpensively, and the operational feeling can be improved.

Further, the leg portion is formed in a cylindrical shape, and a slider can be provided in the leg portion. In the sixth embodiment, that is, as shown in FIG. 12, the leg portion 205 protrudes downward from the attachment member 202. The leg portion 205 is formed of a synthetic resin or the like and has a substantially rectangular tubular shape in which the lower end portion (bottom portion) 205a is closed, that is, has a bottomed cylindrical shape. A compression spring 206 as an elastic member is housed in the leg portion 205. A slider 204 is slidably provided in the leg portion 205. The support member 203 is rotatably coupled to the mounting member 202 with the hinge pin 216 as an axis. The support member 203 is provided with a cam member 207 that is in pressure contact with the slider 204. A reinforcing frame 209 is disposed between the leg portion 205 and the slider 204.

The engagement groove portion 211 as the fitting recess portion may be provided in both the cam member 207 and the slider 204, but is preferably provided in one of the cam member 207 and the slider 204, and is provided, for example, on the slider 204. The insertion fin 212 as the insertion convex portion may be provided to both the cam member 207 and the slider 204, but is preferably provided on any of the cam member 207 and the slider 204, for example, provided on the cam member 207. The rotation control unit 213 is provided to the insertion tab 212. In this configuration, the structure can be simplified, the manufacturing cost can be increased, the braking function can be exhibited inexpensively, and the operational feeling can be improved.

Further, the rotation control unit 9 can be provided at the bottom of the fitting recess 7 (the engagement groove portion 302). As shown in FIGS. 13 and 14, the rotation control unit 301 of the seventh embodiment preferably protrudes a part of the bottom portion of the engagement groove portion 302, and for example, protrudes from the surface in the sliding contact direction and is formed in a curved shape. . Further, the engagement groove portion 302 can be provided in the cam member 311 at a substantially central portion in the width direction of the cam member 311 in a height direction (sliding direction) on a portion from the upper surface to the front surface. A slit shape having a concave cross section is formed. The insertion convex portion 303 protrudes from the sliding portion 314 of the slider 312 as shown in FIG. 15, for example. The width of the insertion convex portion 303 is formed to be narrower than the width of the engagement groove portion 302, for example, a slightly narrower size. The surface of the insertion convex portion 303 in the sliding direction is preferably formed in a curved shape. The protruding shape of the insertion convex portion 303 and the rotation control portion 301 is maximized when the opening angle is about 5 degrees, for example.

Further, as shown in FIGS. 13 to 15 , the cam member 311 and the sliding portion 314 of the slider 312 are preferably formed in a cam shape in which the mounting member 3 is rotated relative to the mounting member 305. Frictional torque is generated between the 305 and the support member 3, and the original platen 12 is stopped in a free stop manner with respect to the apparatus main body 11 as shown in FIG. The cam member 311, for example, the upper surface, the front surface, and the corner portions are formed in a curved shape, and the surface of the sliding portion 314 is formed in a curved shape. That is, the shape of the sliding portion 314 of the cam member 311 and the slider 312 is preferably formed such that when the original pressing plate 12 is rotated in the axial opening direction of the hinge pin 16, the original pressing plate 12 is gradually raised, and the original pressing plate 12 is self-weighted. The force in the reverse direction is weakened, and with this action, the compression spring 17a When the stretching is performed, the force is also weakened, the original platen 12 does not jump, and the frictional torque generated by the sliding contact with each other allows the original platen 12 to be freely stopped with respect to the apparatus main body 11.

This configuration also has the same effects as described above. That is, the original platen 12 is in close contact with the original glass of the apparatus main body 11 in a state where the apparatus main body 11 is not used, and the original glass is shielded. In order to place the document on the original glass, first, the end portion of the original platen 12 on the side opposite to the portion on which the original platen opening and closing device 300 is attached is held, or the original platen 12 is lifted upward, and The original platen 12 is rotated about the hinge pin 16, and the upper surface of the original platen glass is exposed to the outside, so that the original platen 12 is in the open position. At this time, due to the restriction portion 33 of the support member 3 and the rotation restricting portion of the attachment member 305 23 abuts, so the original platen 12 can be in the maximum open position without excessive opening.

Further, when the original platen 12 is rotated, the original platen 12 is biased in the opening direction by the urging force of the compression spring 17a, so that the weight can be sensed without being lifted in the opening direction. Further, the cam member 311 and the sliding portion 314 of the slider 312 are in sliding contact with each other, and the supporting member 3 (original pressing plate 12) is rotated with respect to the mounting member 305. Therefore, if the rotation of the original pressing plate 12 is stopped, the cam member 311 is passed. The frictional torque generated by the sliding contact of the sliding portion 314 causes the original platen 12 to remain stationary at the position where it is stopped. Thereby, the original platen 12 can be freely stopped with respect to the apparatus main body 11.

After the original is placed on the exposed glass surface of the original platen, the raised original platen 12 is lowered, and the original platen 12 is brought into contact with the original platen glass. The closing direction is pivoted about the hinge pin 16 and moved downward to bring it into a closed state. At this time, in order to resist the urging force of the compression spring 17a, it is necessary to apply force, and in the middle, the original platen 12 is applied by the compression spring 17a. The force of the force increases the moment of the original platen 12, so the original platen 12 can be easily rotated. Further, the cam member 311 and the sliding portion 314 are in sliding contact with each other, and at the same time, the supporting member 3 (original pressing plate 12) is rotated with respect to the mounting member 305.

Further, when the original platen 12 is further rotated and approaches the original platen glass, the rotational speed of the original platen 12 is increased, and the rotation control portion 301 is brought into contact with the insertion convex portion 303 due to the state in which the cam member 311 and the sliding portion 314 are in sliding contact with each other. And in a state of sliding contact with each other on the surface, a large torque (or a torque change) is generated between the rotation control portion 301 and the insertion convex portion 303, and therefore, the rotational speed of the original platen 12 is not accelerated, and the reverse is slowed. As a result, the original platen 12 does not violently hit the original glass. When the original placed on the original glass is a thin object, for example, one thin paper, the original pressing plate 12 is rotated only by the hinge pin 16 as an axis, and the original is not lifted from the original glass by the original pressing plate 12, but is tight It is attached to the original glass, so that the original can be copied well.

In the case where the original is thicker than a book, after the original is placed on the original glass, the original pressing plate 12 is rotated in the closing direction, and before the original pressing plate 12 is closed, in other words, the original pressing plate 12 and the original Before the table glass is in close contact, the original platen 12 comes into contact with the end portion of the document, and a space is formed between the end portion on the side opposite to the end portion of the document and the document platen 12. which is, The original platen 12 is in a state in which the end portion on the opposite side of the original platen opening and closing device 300 is floated, and the original platen 12 on the floating side is pressed toward the apparatus main body 11 side or the leg portion 25 is attached to the original portion due to the weight of the original platen 12 The direction in which the hole 13 is pulled out (upward) moves, the original platen opening and closing device 300 moves upward, and the original platen 12 rotates about the hinge pin 16. That is, the height of the original platen opening and closing device 300 is automatically adjusted, and the original platen 12 is moved to cover the upper portion of the original. For example, when the upper portion of the original is a flat surface, the original pressing plate 12 is in surface contact with the upper portion, and as a result, The original having a thick thickness is stably adhered to the original glass, and therefore, regardless of the thickness of the original, the original pressing plate 12 can stably adhere the original to the original glass, and can prevent external light from intruding into the main body of the apparatus. Internal and hinder exposure.

In this manner, when the original platen 12 is rotated in the closing direction and close to the original platen glass, the rotation control portion 301 and the insertion convex portion 303 are in sliding contact with each other and a large rotational torque is generated, so that the rotational speed of the original platen 12 is slowed, and the original platen is lowered. 12 will not violently hit the original glass. Further, when the original platen 12 is rotated from the closed state to the direction in which the original platen 12 is opened, in a state where the original platen 12 is slightly raised by hand, even if the hand leaves the original platen 12 at a certain moment, the force of the friction and compression spring 17a is exerted. It is intended to hold the original platen 12 in its position, so that there is no fear that the original platen 12 will violently hit the original glass at the moment of letting go.

In addition, since the rotational torque is formed to the maximum when the surface of the rotation control unit 301 in the sliding direction is curved and the opening angle is about 5°, a large rotational torque does not suddenly occur in the middle of the rotation of the original platen 12, so that Original The operation feeling of the pressure plate 12 at the time of opening and closing operation is good.

Therefore, the original platen opening and closing device 300 and the office equipment 10 according to the seventh embodiment can be configured to be simple in structure, can increase the manufacturing cost, can exhibit the braking function at low cost, and also have a good operational feeling, so that the office equipment 10 can be used with confidence. .

Referring to Fig. 16, Fig. 16 is a graph showing the correlation between the rotational moment curve of the original platen and the torque curve of the original platen opening and closing device. The torque curve of the original platen and the torque curve of the original platen opening and closing device are as follows. : at a predetermined opening angle (about 17° in the embodiment), when the predetermined opening angle is equal to or greater than the predetermined opening angle, the turning torque of the original platen opening and closing device is shifted in a state beyond the rotational moment of the original platen, at a predetermined When the opening angle is equal to or lower than the opening angle, the rotational torque of the original platen is in a state exceeding the rotational torque of the original platen opening and closing device. Thereby, the original platen 12 can be opened without being able to feel its original weight when it is opened, and in the case of the intermediate opening angle, the original platen 12 can be freely stopped, and the original platen 12 does not fall rapidly when closed. And it can prevent floating phenomenon when closing. The original platen opening and closing device 300 of the present invention can rotate the torque of the original platen 12 at a middle opening angle of the original platen 12, and the rotation torque of the original platen 12 can be rotated by a predetermined opening angle or less. The control portion can prevent the torque of the original platen 12 from rapidly decreasing.

In addition, one rotation control unit 301 is provided at the bottom of the engagement groove portion 302, and a large rotational torque is generated when the original pressure plate 12 is positioned near the upper surface of the apparatus main body 11, but the present invention is not limited thereto and may be set as follows. Rotation control Portion: a large rotational torque is generated when the original platen 12 is in the vicinity of the upright state with respect to the apparatus body 11, and a plurality of rotation control portions may be provided; for example, in the case where a plurality of rotation control portions are provided, the original is When the pressure plate 12 is located near the upper surface of the apparatus main body 11, two rotation control portions may be provided to generate a large rotational torque when the original pressure plate 12 is positioned in the vicinity of the upright state with respect to the apparatus main body 11. Further, the rotation control portion is provided at the bottom of the engaging groove portion and provided on the side of the engaging groove portion, for example, when the original pressing plate 12 is located near the upper surface of the apparatus main body 11, the original pressing plate 12 is opposed to the apparatus main body When the 11 is in the vicinity of the erect state, a large rotational torque and a friction torque can be generated, respectively.

As described above, the document platen opening and closing device of the present invention is configured such that a fitting recess is provided in one of the slider and the cam member, and an insertion convex portion that fits the fitting recess is provided in the other of the slider and the cam member. At least one of the fitting recess and the insertion convex portion is provided with a rotation control portion, and when the support member is rotated with respect to the attachment member, friction torque is generated during the rotation, and the opening and closing operation of the original pressure plate is controlled, or the slider and the cam member are One of the sliders and the cam member is provided with an insertion convex portion that fits the fitting recess, and the rotation control portion is provided in the fitting recess, and when the support member is rotated with respect to the attachment member, In the middle of the rotation, a large rotational torque is generated to control the opening and closing operation of the original platen, thereby making it possible to print the printing machine, the printing machine, and the facsimile machine without increasing the manufacturing cost, simplifying the structure, and exerting the braking function, and the operation feeling is also good. Original platen opening and closing device for office equipment such as scanners.

According to the above, it is only a preferred embodiment of the present invention, but only The features of the invention are not limited thereto, and any changes or modifications that can be easily conceived by those skilled in the art within the scope of the invention are intended to be included in the following claims.

1‧‧‧Original platen opening and closing device

81‧‧‧Insert tab

2‧‧‧Installation components

82‧‧‧Insert tab

21‧‧‧ base

91‧‧‧Rotation Control Department

22‧‧‧Rotation

102‧‧‧Installation components

22a‧‧‧Axis hole

103‧‧‧Support members

23‧‧‧Rotation Restriction

104‧‧‧ Lifting components

25‧‧‧foot

105‧‧‧2nd slider

25a‧‧‧Guiding film

106‧‧‧Cam components

25b‧‧‧Conical surface

108‧‧‧1st slider

26‧‧‧ convex

115‧‧‧Installation pins

28‧‧‧ Bearing

116‧‧‧ Hinge pin

3‧‧‧Support members

117‧‧‧Flexible components

31‧‧‧Rotating piece

117a‧‧‧Compressed spring

32‧‧‧Axis insert through hole

118‧‧‧Promotional sales

33‧‧‧Restrictions

119‧‧‧Work sales

3a‧‧‧Upper board

122‧‧‧ both sides

3b‧‧‧ both sides

121‧‧‧floor

3c‧‧‧ lower board

202‧‧‧Installation components

3e, 3f‧‧‧Installation

204‧‧‧ Slider

3d‧‧‧Elastic member support

203‧‧‧Support members

5‧‧‧ Slider

205‧‧‧ feet

5a‧‧‧Apartment

205a‧‧‧ lower end

5b‧‧‧Spring storage unit

206‧‧‧Compressed spring

6‧‧‧Cam components

207‧‧‧Cam components

7‧‧‧ fitting recess

209‧‧‧Rigid frame

8‧‧‧Insert convex

211‧‧‧Clamping groove

9‧‧‧Rotation Control Department

212‧‧‧Insert tab

10‧‧‧Office equipment

213‧‧‧Rotation Control Department

11‧‧‧Device body

216‧‧‧ Hinge pin

12‧‧‧ Original platen

300‧‧‧Original platen opening and closing device

13‧‧‧Installation holes

301‧‧‧Rotation Control Department

14‧‧‧Moving tolerance recess

302‧‧‧Clamping groove

16‧‧‧ Hinge pin

303‧‧‧Insert convex

17‧‧‧Flexible components

305‧‧‧Installation components

17a‧‧‧Compressed spring

311‧‧‧Cam components

71‧‧‧Clamping groove

312‧‧‧ Slider

72‧‧‧Clamping groove

314‧‧‧Sliding section

1 is a side view showing a state in which an original platen is closed in an example of a document discriminating apparatus of the document platen opening and closing device of the present invention; and FIG. 2 is a view showing an example of the document platen opening and closing device of the present invention, (a) being A side view of the closed state, (b) is a schematic perspective view in an open state, (c) is a side view of the open state, and FIG. 3 is a schematic cross-sectional view showing an example of the original platen opening and closing device of the present invention. (a) is a schematic view showing a closed state, (b) is a schematic view showing an open state, and FIG. 4 is a view showing an example of a mounting member of the present invention, (a) is a perspective view, and (b) is a front view; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 6 is a front elevational view showing an example of a slider according to a second embodiment of the present invention; and FIG. 7 is a second embodiment of the present invention. Fig. 8 is a perspective view showing an example of a mounting member in a third embodiment of the present invention; and Fig. 9 is a view showing a mounting member in a fourth embodiment of the present invention. Example main view intention; 10 is a front view showing an example of a slider in a fourth embodiment of the present invention, and FIG. 11 is a cross-sectional view showing an example of a document plate opening and closing device according to a fifth embodiment of the present invention; Fig. 13 is a schematic cross-sectional view showing an example of a document plate opening and closing device according to a sixth embodiment of the present invention; and Fig. 13 is a perspective view showing an example of a document plate opening and closing device according to a seventh embodiment of the present invention; (a) is a schematic perspective view, (b) is a schematic front view, and (c) is a cross-sectional view taken along the line AA of (b) in the arrow direction of the figure. Fig. 15 is a view showing an example of a slider in a seventh embodiment of the present invention, (a) and (b) are schematic perspective views, (c) is a front view, and (d) is a side view And Fig. 16 is a graph showing the correlation between the torque curve and the torque curve of the document platen opening and closing device in the seventh embodiment of the present invention.

1‧‧‧Original platen opening and closing device

3f‧‧‧Installation

2‧‧‧Installation components

10‧‧‧Office equipment

21‧‧‧ base

11‧‧‧Device body

25‧‧‧foot

12‧‧‧ Original platen

25b‧‧‧Conical surface

13‧‧‧Installation holes

26‧‧‧ convex

14‧‧‧Moving tolerance recess

3‧‧‧Support members

16‧‧‧ Hinge pin

3b‧‧‧ both sides

Claims (14)

An original platen opening and closing device includes: a mounting member mounted on an apparatus main body side of an office equipment having an original pressing plate; a supporting member rotatably mounted to the mounting member and supporting the original pressing plate; a slider a slidably disposed in one of the support member and the mounting member; a cam member disposed on the other side of the support member and the mounting member and in sliding contact with the slider; and an elastic member Provided between the slider and the support member or the mounting member, the elastic member presses the slider into contact with the cam member, and controls an opening operation of the original platen, and one of the slider and the cam member is disposed The fitting recessed portion is provided with an insertion convex portion that is fitted into the fitting concave portion, and at least one of the fitting concave portion and the insertion convex portion is provided with a rotation control portion to rotate the support member relative to the mounting member. A friction torque is generated to control the opening and closing operation of the original platen. The original platen opening and closing device according to the first aspect of the invention, wherein the fitting recess has an engaging groove portion extending in a sliding direction of the slider to form a slit shape, and the insertion convex portion has a locking tab edge The sliding direction of the slider extends to protrude, and a portion of the engaging tab is widened to form the rotation control portion. The original platen opening and closing device according to claim 1, wherein the upper plate The fitting recess has an engaging groove portion extending in a sliding shape along the sliding direction of the slider, and both sides of the engaging groove portion are formed to have a width reduced to form the rotation control portion. The original platen opening and closing device according to the first aspect of the invention, wherein the fitting recess has an engaging groove portion extending in a sliding shape along a sliding direction of the slider, and the slit-shaped cross section is concave. One of the bottom portions of the engaging groove portion protrudes to form the aforementioned rotation control portion. The original platen opening and closing device according to the first aspect of the invention, wherein the fitting recess and the insertion protrusion are respectively provided at least one. The original platen opening and closing device according to the first aspect of the invention, wherein the slider and the cam member are respectively in a cam shape, and the support member is rotated relative to the mounting member to bias the support member in an opening direction and generate friction The torque is such that the aforementioned original platen is stopped in a free stop manner with respect to the aforementioned apparatus main body. The original platen opening and closing device according to claim 1, wherein the rotation control portion is disposed in the vicinity of an upper surface of the apparatus main body and the original pressing plate is in a state of being in an upright state with respect to the apparatus main body Moment. The original platen opening and closing device according to claim 1, wherein the rotation control portion is disposed when the original pressing plate is located near an upper surface of the apparatus main body or the original pressing plate is in a state of being in an upright state with respect to the apparatus main body to generate a frictional rotation. Moment. The original platen opening and closing device of claim 1, wherein the original platen opening and closing device The mounting member has a bottom plate mounted on the surface of the apparatus body, and two side plates rising from both side portions of the bottom plate, the support member being rotatably mounted to the side plates via a hinge pin, and the cam member is mounted on Between the two sides of the aforementioned plates. The original platen opening and closing device according to the first aspect of the invention, wherein the mounting member has a leg portion that is disposed in a mounting hole of the device body in an up-and-down direction, and the leg portion is insertably movable up and down In the aforementioned mounting hole. The original platen opening and closing device according to claim 10, wherein the leg portion is formed in a tubular shape, and the slider and the elastic member that slidably urge the slider in one direction are provided inside. The original platen opening and closing device of claim 1, wherein a free end side of the support member is mounted with a lifting member, the lifting member and the supporting member are rotatable in direction, and the rotating direction thereof is different from the supporting member. The original platen is attached to the lifting member. The original platen opening and closing device according to claim 10, wherein the attachment member has a rotation restricting portion, the base of the rotation restricting portion is on an upper end side of the leg portion, and the support member has a restricting portion and the The rotation restricting portion abuts. An original platen opening and closing device for an office equipment having a document platen according to any one of claims 1 to 13.