Hinge device and various machines equipped with the hinge device

Abstract

The present invention provides a hinge device with a simple structure that can be flattened and various machines equipped with the hinge device. The hinge device can prevent the manuscript pressing plate from falling rapidly when closing and allow the user to have a smooth operation experience. The hinge device includes: a mounting member, which is mounted on the side of the machine body; a supporting member, which is mounted on the manuscript pressing plate and is composed of a support shaft and a supporting part; a hinge shaft, which rotatably connects the support shaft of the supporting member to a pair of side plates of the mounting member; a sliding member, which can be slidably stored in the storage part and is provided with a slider cam protrusion on the top; an elastic member, which is arranged between the bottom of the storage part and the sliding member; a damper, which is arranged in the elastic member; and a push rod, which abuts against the first rotating cam part at a predetermined closing angle when the manuscript pressing plate performs a closing action, and is slidably stored in the guide cylinder.

Description

Technical Field

[0001] The present invention relates to a preferred hinge device and various machines equipped with the hinge device, especially for use in office machines such as copiers or compound copiers, or printing machines, or the machine body of various machines including furniture, etc., such as covers installed on original pressing plates that need to be opened and closed. Background Art

[0002] Conventionally, a hinge device and a copier equipped with the hinge device include the following components: a mounting component, which is mounted on a machine body such as a copier, a supporting component, which is rotatably mounted on the mounting component via a hinge shaft to support a document pressing plate; a storage portion provided on the mounting component, which stores a sliding component that applies a unidirectional sliding force; a first rotating cam portion provided on the supporting component abuts against a first sliding cam portion provided on the top of the sliding component, and a damper is retracted into the sliding component; a piston rod of the damper is connected to a push rod, and a second sliding cam portion is provided on the top of the push rod; the push rod protrudes from an opening provided on the top of the sliding component toward the first rotating cam portion; the above-mentioned hinge device structure, etc., is already well known as recorded in the Japanese Patent Gazette No. 2015-183840.

[0003] The hinge device described in the above-mentioned patent publication has not only too many structural parts and high manufacturing cost, but also another problem is that in the closing operation of the manuscript pressing plate, the descending distance of the push rod due to the first rotating cam portion is greater than the distance of the sliding member that is also descended due to the first rotating cam portion. Therefore, the user will feel strange when closing the manuscript pressing plate. In addition, since the push rod simply abuts against the upper part of the piston rod, and the axial length of the guide hole of the push rod formed in the sliding member is short, it is difficult for the push rod to slide smoothly; this makes the user feel strange when closing the manuscript pressing plate, and the push rod and the guide hole will also cause incompatibility due to years of use. Summary of the invention

[0004] The object of the present invention is to provide a hinge device that solves the above-mentioned problems and various machines equipped with the hinge device; the hinge device of the present invention has a simpler structure and is relatively cheap to manufacture, which not only allows users to have a smooth operating experience, but also has excellent durability and will not cause inconsistencies even after long-term use.

[0005] In order to achieve the above-mentioned purpose, the hinge device of the present invention is characterized by: a mounting member, which is mounted on the side of the machine body, has a pair of side plates on the upper part and is provided with a storage part open to the upper part inside; a supporting member, which is mounted on the original pressing plate, and is composed of a support shaft part and a supporting part, and the support shaft part has a first rotating cam part; a hinge shaft, which connects the support shaft part of the supporting member to the pair of side plates of the mounting member in a rotatable manner; a sliding member, which can be slidably stored in the storage part, and has a slider cam protrusion on the top, and the slider cam protrusion is in a state of constant pressure-fit connection with the first rotating cam part; an elastic member, It is arranged between the bottom of the storage part and the sliding member, and causes the sliding member to apply force toward the first rotating cam part; a damper is arranged in the elastic member; and a pushing rod, which abuts against the first rotating cam part at a predetermined closing angle when the original pressing plate performs a closing action, and is slidably accommodated in a guide cylinder part, which is formed in the sliding member and has an opening part on the top. At the same time, one end of the pushing rod is connected to the piston rod of the damper; when the original pressing plate is closed from a predetermined opening angle, the moving distance of the sliding member after being pressed by the first rotating cam part is longer than the moving distance of the pushing rod.

[0006] As described above, the hinge device of the present invention is characterized in that the length of the guide tube is substantially the same as the length of the push rod.

[0007] Furthermore, the hinge device of the present invention is characterized in that when the front end of the piston rod is connected to the push rod, the front end of the piston rod needs to be inserted into the connecting hole provided at the lower end side of the push rod.

[0008] Furthermore, the hinge device of the present invention is characterized in that when the front end of the piston rod is connected to the push rod, the front end side of the piston rod and the lower end side of the push rod are connected by a pin that penetrates in the radial direction.

[0009] Furthermore, the hinge device of the present invention is characterized in that the first rotating cam portion and the second rotating cam portion provided on the support shaft portion sandwich the hinge shaft and abut against the top of the sliding member to limit the maximum rotation angle of the supporting member.

[0010] In addition, various machines related to the present invention include the above-mentioned hinge device, the machine body and the manuscript pressing plate; the machine body has a placement surface for placing manuscripts; the manuscript pressing plate presses the manuscript placed on the placement surface when in a closed state, and changes between a closed state and an open state relative to the placement surface by rotating simultaneously with the supporting component.

[0011] In the present invention, the hinge device is not only simple in structure and can prevent the manuscript pressing plate from falling rapidly, but also allows the user to have a smooth opening and closing operation experience, and its durability will not cause inconsistency even after long-term use.

[0012] In the present invention, when the manuscript pressing plate is opened and closed, even if the push rod is subjected to the force of the first rotating cam portion shaking in the forward and backward directions, the length of the guide tube portion is roughly equal to the length of the push rod, so that the push rod can maintain a smooth sliding action, so there will be no inconsistency even if it is used for many years, and the durability is quite excellent.

[0013] In the present invention, the piston rod and the push rod are not only securely connected and stably operated, but the push rod can also be replaced depending on the machine model, that is, one hinge device can be applicable to various types of MFPs.

[0014] In the present invention, when the manuscript pressing plate is in a fully opened state of less than 90 degrees, the hinge device can still maintain the stability of the manuscript pressing plate in the fully opened state.

[0015] Various machines of the present invention use hinge devices having the above-mentioned characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a perspective view of a copying machine, which is one of various machine examples equipped with the hinge device of the present invention.

[0017] Figure 2 This is a three-dimensional view of the hinge device of the present invention presented separately.

[0018] Figure 3 for Figure 2 The hinge device shown is a longitudinal cross-sectional view of a state where the support member is rotated at an angle of 0°.

[0019] Figure 4 for Figure 3 The hinge device shown is a longitudinal cross-sectional view of a state where the support member is rotated at an angle of 70°.

[0020] Figure 5 for Figure 3 The hinge device shown is a longitudinal cross-sectional view of a state where the support member is rotated at an angle of 35°.

[0021] Figure 6 for Figure 3 The hinge device shown is a longitudinal cross-sectional view of a state where the support member is rotated at an angle of 20°.

[0022] Figure 7 for Figure 3 The hinge device shown is a longitudinal cross-sectional view of a state where the support member is rotated at an angle of 15°.

[0023] Figure 8 for Figure 3 In the hinge device shown, the torque curve diagram of the support member when the rotation angle is from 0° to 70°. DETAILED DESCRIPTION

[0024] The following will illustrate the preferred embodiment of the hinge device of the present invention used in a copier with the accompanying drawings. The copier cover in this description is the original pressing plate, and the term original pressing plate is used to replace the cover in the description; in other machines, the term original pressing plate can be replaced by the cover. In addition, the following description will use and refer to Figure 2 The front-back, left-right, and up-down directions are marked by the rectangular coordinate system shown.

[0025] (Implementation Method 1) Figure 1 The copier 1 shown is provided with a placement surface 2a, which is provided on the upper surface 2b of the machine body 2 and is made of contact glass for placing originals. The copier 1 can read the originals placed on the placement surface 2a, and can be, for example, a copier with only a copying function, or a composite copier with multiple functions such as copying, scanning and faxing. The copier 1 includes a machine body 2, an original pressing plate 3 as a cover of the copier, and hinge devices 10, 10, which are provided on the machine body 2 and support the original pressing plate 3 in a rotatable manner.

[0026] Although the hinge devices 10 and 10 shown in the embodiment of the present invention have the same structure, they are not limited thereto and may have different structures on the left and right sides. Since the hinge devices 10 and 10 in the embodiment of the present invention have the same structure, the following description will use the structure of one of the hinge devices 10 for description.

[0027] like Figure 2 As shown in the following figures, the hinge device 10 includes a mounting member 20 and a supporting member 30. The mounting member 20 has a cylindrical support portion 21, and the supporting member 30 is rotatably arranged on the mounting member 20 through a hinge shaft 80. The mounting member 20 is a plastic injection product, and a material having mechanical strength such as polypropylene (PP) can be used as a material; at the same time, as long as the support portion 21 is inserted into the mounting hole 2c provided at the upper end of the rear of the machine body 2, the mounting member 20 can be installed on the machine body 2. The depth of the mounting hole 2c is the same as the height of the support portion 21. In addition, the protrusion indicated by the indicator mark 21a is a guide protrusion, which is provided at the rear end of the lower end of the support portion 21; when the support portion 21 is inserted into the mounting hole 2c, the guide protrusion 21a will be fitted into the guide groove provided in the mounting hole 2c to prevent it from being loosened, and can be fixed at the insertion position at all times. However, the structure of the mounting member 20 is not limited to the style shown in the embodiment. Another embodiment may be to design the support portion 21 as a square tube shape, and install mounting plates on both sides, and then assemble the mounting plates into the upper rear end portion of the machine body 2.

[0028] The manuscript pressing plate 3 presses the manuscript placed on the placement surface 2a of the copier 1 from the top to the bottom, so that the wrinkles of the manuscript can be pressed down or the manuscript can be prevented from moving when the machine reads the manuscript. As mentioned above, the manuscript pressing plate 3 pressing the manuscript is in a closed state at this time, covering the placement surface 2a of the machine body 2. On the other hand, when the placement surface 2a of the copier 1 is placed with a manuscript, the user lifts the manuscript pressing plate 3 in the closed state upward to expose the placement surface 2a of the machine body 2. At this time, the manuscript pressing plate is in an open state.

[0029] Furthermore, the state of the hinge device 10 installed on the manuscript pressing plate 3 is the same as that of the manuscript pressing plate 3, and its description is the same as above. Figure 3 As shown in FIG. 1 , when the manuscript pressing plate 3 is in a closed state, the hinge device 10 is also in a closed state, and the rotation angle of the support member 30 relative to the machine body 2 is 0°. In addition, when the manuscript pressing plate 3 is in an open state, the hinge device 10 is also in an open state. When the support member 30 rotates away from the placement surface 2a of the machine body 2, the rotation angle will continue to increase, and the rotation angle will continue to increase. Figure 1 and Figure 4 Taking the state shown as an example, the rotation angle of the support member 30 relative to the machine body 2 is 70°. For the hinge device 10 of the present invention, the rotation angle of 70° is the maximum opening angle of the document pressing plate 3.

[0030] like Figure 3 As shown in the following drawings, the support portion 21 of the mounting member 20 is provided with a storage portion 22 for storing various parts described later; the storage portion is open at the top and has a bottom 22a at the bottom. In addition, the indicator mark 22b provided at the bottom 22a is a hole for exhaust.

[0031] Furthermore, Figure 2 As shown, a pair of side plates 23, 23 are provided on the upper portion of the mounting member 20. The pair of side plates 23, 23 (as shown in FIG. Figure 2 The pair of side plates 23, 23 are respectively formed with shaft insertion holes 23a, 23a (only one side is shown in the figure, Figure 2 The hinge shaft 80 is inserted through the shaft insertion holes 23a, 23a on the pair of side plates 23, 23 and the shaft insertion hole 31a provided on the support shaft portion 31 of the support member 30. With this arrangement, the support member 30 can rotate around the hinge shaft 80. In addition, the position indicated by the indicator mark 24 is a part of the stopper, which is formed at the rear part of the mounting member 20 across the left and right directions. In this embodiment, the stopper 24 is used to prevent the support member from rotating more than 70°.

[0032] The supporting member 30 is also a plastic injection molded product, and can be made of a material having mechanical strength such as polypropylene (PP). Figure 2 As shown in the following drawings, it is composed of a support shaft portion 31 and a support portion 32 extending forward from the support shaft portion 31; the support member 30 is provided with a recess 31d, which is located below the shaft insertion hole 31a provided on the support shaft portion 31, and is sandwiched between the first rotating cam portion 31b and the second rotating cam portion 31c. The first rotating cam portion 31b and the second rotating cam portion 31c are asymmetrical when viewed from the axial direction.

[0033] The support member 30 and the mounting member 20 are in a connected state. Figure 3 As shown in the following figures, the hinge shaft 80 passes through the shaft insertion hole 31a of the support shaft portion 31 of the support member 30 and passes through the pair of side plates 23, 23 of the mounting member 20, that is, inserted between the pair of side plates 23, 23, thereby connecting the support member 30 and the mounting member 20. Figure 3 As shown in the following figures, according to different rotation angles of the support member 30 around the hinge shaft 80 , the first rotating cam portion 31 b will contact or push the sliding member 40 , the pressing rod 70 and the stopper 24 .

[0034] The support part 32 is mounted on the rear of the manuscript pressing plate 3 through mounting holes 32a, 32a, etc. provided thereon, using generally known connecting means such as a latch or a screw not shown in the figure. The width of the support part 32 in the left-right direction is wider than that of the support shaft part 31. With this arrangement, the support part 32 can be connected to the manuscript pressing plate 3 in a wider range, and support the manuscript pressing plate 3 to keep it in a stable state. Therefore, the manuscript pressing plate 3 operated by the user will rotate together with the support member 30 around the hinge shaft 80.

[0035] In addition, Figure 3 As shown in the following drawings, a sliding member 40 and an elastic member 50 are installed inside the storage portion 22 in the mounting member 20; the sliding member 40 can slide in the up and down directions in the storage portion 22, and the elastic member 50 is composed of a compression coil spring, which is elastically installed between the sliding member 40 and a pressure base member 61, and the pressure base member 61 is arranged at the bottom 22a.

[0036] Again, if Figure 3As shown in the following drawings, the sliding member 40 has an outer cylinder 41, a guide cylinder 42 and a top 43; the outer cylinder 41 is formed into a cylinder, the guide cylinder 42 is arranged inside the outer cylinder 41 and is formed into a concentric cylinder, and the top 43 connects the upper end of the outer cylinder 41 and the upper end of the guide cylinder 42. The height of the outer cylinder 41 is lower than the depth of the storage portion 22, and the height of the guide cylinder 42 is also lower than the height of the outer cylinder 41. When the outer cylinder 41 is cut with a plane perpendicular to the up-down direction, the outer shape of the cross section is circular, and the outer diameter of the outer shape is equal to the inner diameter of the storage portion 22 provided in the mounting member 20. With this arrangement, the sliding member 40 can slide and displace in the storage portion 22 in the up-down direction. In addition, a mountain-shaped and upwardly protruding slider cam protrusion 43a is provided in the front side portion above the top 43. The slider cam protrusion 43a is formed in a horizontal manner along the left and right directions of the support shaft portion 31, and an inclined portion 43b continuing from this slider cam protrusion 43a, and a flat portion 43c continuing from this inclined portion 43b are also formed at the top 43 at the same time.

[0037] The elastic member 50 is formed into a cylindrical compression coil spring, and its upper part is accommodated in the elastic member accommodation portion 40a, which is divided and divided by the outer cylinder portion 41, the guide cylinder portion 42 and the top portion 43 of the sliding member 40. The upper end of the elastic member 50 abuts against the lower side of the top portion 43 of the sliding member 40. In addition, the lower end of the elastic member 50 abuts against the pressure base member 61, which is installed on the bottom 22a of the accommodation portion 22. As described above, the elastic member 50 is elastically installed between the sliding member 40 and the pressure base member 61, which is located at the bottom 22a of the accommodation portion 22. Furthermore, because the elastic member 50 is accommodated in the accommodation portion 22 in a compressed state, the sliding member 40 is constantly forced to face upward, that is, the sliding member 40 faces the first rotating cam portion 31b side. The sliding member 40 exerts force on the first rotating cam portion 31b, and its force pushes the first rotating cam portion 31b upward through the slider cam protrusion 43a. Figure 3 As shown in FIG. 1 , the position where the slider cam protrusion 43a pushes the first rotating cam portion 31b upward is slightly forward of the position of the hinge shaft 80. Therefore, when the hinge device 10 is in a closed state, the force of the sliding member 40 causes the supporting member 30 to rotate in the opening direction, that is, Figure 3 As shown in the clockwise direction to rotate the support member 30; but if Figure 3 When the opening and closing angle of the document pressing plate 3 is shown to be 0°, the elastic force of the sliding member 40 is smaller than the rotation torque generated around the hinge shaft 80 by the document pressing plate 3, so the document pressing plate 3 will not float up by itself due to vibration or the like.

[0038] Furthermore, the receiving portion 22 of the mounting member 20 further receives a damper 60 and a push rod 70 . The damper 60 includes a piston rod 60 a , and the push rod 70 is connected to the piston rod 60 a .

[0039] The damper 60 is mounted on the pressure base member 61 so that the piston rod 60a is pushed upward, and is simultaneously received inside the elastic member 50. The oil and the piston disposed inside the damper 60 are not shown in the figure. Although the damper 60 in this embodiment is a liquid flow damper, the oil encapsulated therein may also be replaced by gas.

[0040] The push rod 70 is formed into a cylindrical shape, and an inclined cam portion 70a inclined forward is provided at its upper end, and can slide in the vertical direction inside the insertion hole 40b of the guide cylinder portion 42 provided inside the sliding member 40 and be accommodated therein. The inner diameter of the insertion hole 40b of the guide cylinder portion 42 is equal to the outer diameter of the push rod 70, and the piston rod 60a is inserted into the connecting hole 70b provided in the axial direction from the lower part of the push rod 70. In this embodiment, the piston rod 60a is connected to the push rod 70 by a pin 60b penetrating the radial direction, but since the push rod 70 is accommodated in the insertion hole 40b of the guide cylinder portion 42, the length of the insertion hole 40b is approximately equal to the length of the push rod 70, so as the original document pressing plate 3 is opened and closed, the push rod 70 can remain stable even if it is subjected to the force of shaking in the front and rear directions from the first rotating cam portion 31b. Therefore, it is sufficient to insert the front end of the piston rod 60a into the connecting hole 70b provided at the lower part of the push rod 70. At this time, in order to prevent the push rod 70 from rotating during use, the push rod 70 must be designed as a quadrangular shape or provided with a guide protrusion. Figure 3 When the document pressing plate 3 shown is in a closed state, the inclined cam portion 70a at the upper end of the pushing rod 70 will protrude upward from the opening portion 42a of the guide cylinder portion 42 and abut against the first rotating cam portion 31b, wherein the opening portion 42a of the guide cylinder portion 42 is arranged at the top of the sliding member 40.

[0041] Next, the hinge device 10 of the present invention is characterized by the action it exhibits when the manuscript pressing plate 3 is closed from the open state. Figures 3 to 8 , explaining the action of the hinge device 10 during the change of the original pressing plate 3 from the open state to the closed state. Furthermore, in order to make the action of the hinge device 10 easy to understand, Figures 3 to 7 The machine body 2 and the manuscript pressing plate 3 are both shown with two-point locking lines.

[0042] The elastic force of the elastic member used in the hinge device of a general copier will only make the user feel its weight slightly when the user wants to open the manuscript pressing plate, and the manuscript pressing plate can be stably stopped at the middle opening and closing angle; and when closing, in order to prevent the manuscript pressing plate from closing rapidly and further stabilize its closed state so that it does not float upward, the elastic force of the elastic member is set to be smaller than the rotational torque, which is the rotational torque generated around the hinge axis when the manuscript pressing plate is closed. Therefore, it is necessary to prevent the manuscript pressing plate 3 from closing rapidly and making a loud noise due to the inertial force generated when closing, or causing the user to accidentally pinch his hand. In order to achieve the above purpose, in addition to using the elastic member, the present invention also uses a damper as another buffer device, but it is necessary to make arrangements to make the damper work at which stage.

[0043] Figure 3 The hinge device 10 is shown in a state where the angle is 0°, and this 0° state is a state where the supporting member 30 and the document pressing plate 3 are relative to the document placing surface 2a of the machine body 2; Figure 4 The hinge device 10 is shown in a state where the rotation angle is 70°, which is the angle between the support member 30 and the document pressing plate 3 and the document placement surface 2a of the machine body 2. Meanwhile, 70° is the maximum opening angle of the document pressing plate 3. Figure 4 As shown, at this time, the first rotating cam portion 31b and the second rotating cam portion 31c of the supporting member 30 will clamp the hinge shaft 80, and abut against the slider cam protrusion 43a arranged on the top of the sliding member 40 and the flat portion 43c arranged at the rear thereof; through this arrangement, the supporting member 30 will not be rotated and force applied in any direction, so even if the user's hand does not hold the original pressing plate, the original pressing plate can stably stop at an opening angle of 70° and will not open or close in any direction.

[0044] Furthermore, the slider cam protrusion 43a abuts against the first rotating cam portion 31b, and the slider cam protrusion 43a is provided on the sliding member 40 which is urged upward by the elastic member 50. The force of the slider cam protrusion 43a pushes the first rotating cam portion 31b upward, thereby rotating the supporting member 30 in the opening direction. Figure 1 In order to bear the weight of the document pressing plate 3 shown in the figure, the supporting member 30 must bear the force of the document pressing plate 3 rotating in the closing direction. In addition, if the rotation angle of the supporting member 30 is large, for example, the rotation angle of the supporting member 30 is more than 30°, the force of the supporting member 30 rotating in the opening direction due to the slider cam protrusion 43a will be balanced with the rotation torque of the document pressing plate 3 rotating in the closing direction due to the weight of the document pressing plate 3. Therefore, as long as the user does not try to move the document pressing plate 3 ( Figure 1 ), which can maintain Figure 3 The rotation angle of the hinge device 10 shown in FIG. Figure 6 As shown, when the opening and closing angle of the document pressing plate 3 and the supporting member 30 is 20°, the position of the inclined cam portion 70a of the pushing rod 70 will be retracted below the guide cylinder portion 42 of the sliding member 40, and will not be in abutment with the first rotating cam portion 31b.

[0045] like Figure 4 As shown in FIG. 1 , when the user presses the fully opened document pressing plate 3 in the closing direction, the first rotating cam portion 31b presses the slider cam protrusion 43a downward, and the sliding member 40 is pressed and moved downward. On the other hand, when the document pressing plate 3 moves from the fully opened position to the closed position, the first rotating cam portion 31b presses the slider cam protrusion 43a downward. Figure 7 In the position where the opening and closing angle is 15°, the inclined cam portion 70a of the push rod 70 does not abut against the first rotating cam portion 31b during this transition, so no action is performed. Figure 7 In the state shown, that is, when the rotation angle of the hinge device 10 is 15°, the first rotating cam portion 31b will be connected to the inclined cam portion 70a of the pushing rod 70. Through this connection, the pushing rod 70 will slide downward as the opening and closing angle decreases. The damper 60 will play a stronger role together with the compressed elastic member 50 due to the lowering of the pushing rod 70 to cushion the falling speed of the original pressing plate 3.

[0046] According to the above structure, when the rotation angle of the support member 30 of the hinge device 10 and the opening and closing angle of the document pressing plate 3 are greater than 15° and less than 70°, the first rotating cam portion 31b will abut against the slider cam protrusion 43a of the sliding member 40 which is urged upward by the elastic member 50, but will not abut against the inclined cam portion 70a of the push rod 70. Therefore, the hinge device 10 of the present invention will be as follows: Figure 8 As shown in the torque curve diagram, when the closing angle of the document pressing plate 3 relative to the placing surface 2a of the machine body 2 is 15°, the document pressing plate 3 mostly starts to move from a closing angle that can be automatically closed due to its own weight and inertia force when closing. Therefore, the user will not feel any strangeness in the operation and can smoothly close the document pressing plate, while also preventing the document pressing plate 3 from closing rapidly.

[0047] The above content only needs to be compared Figure 4 and Figure 3 It can be understood and verified that, in the process of the manuscript pressing plate 3 of the present invention moving from the fully open 70° position to the fully closed 0° position, the movement amplitude of the slider cam protrusion 43a of the sliding member 40 after being pressed by the first rotating cam portion 31b is longer than the movement amplitude of the inclined cam portion 70a of the pushing rod 70.

[0048] Figure 8The torque curve of the hinge device 10 of the present invention is shown. As shown in the figure, when the opening and closing angle is between 15° and 20°, the torque curve shown by the manuscript pressing plate 3 intersects with the torque curve of the elastic device 50; at an opening and closing angle above this opening and closing angle, the manuscript pressing plate 3 will not fall down by itself because the elastic force of the elastic member 50 prevails, so the user only needs to apply a little force to operate it, and the manuscript pressing plate 3 will not fall down when the user lets go. If the opening and closing angle is below the angle where the torque curve shown by the manuscript pressing plate 3 intersects with the torque curve of the elastic device 50, the gravity of the manuscript pressing plate 3 prevails, so when the user lets go, the manuscript pressing plate 3 will fall down by itself; but as shown in the figure, the damper 60 will start to operate at this opening and closing angle, so the descending speed of the manuscript pressing plate 3 will be buffered.

[0049] The present invention is not limited to the above-mentioned embodiment, and can also have various changes and applications. In the above-mentioned embodiment, although the maximum opening angle of the support member 30 relative to the machine body 2 has been set at 70°, it is not limited to this, and its angle can be set arbitrarily. In addition, when the rotation angle of the support member 30 is less than 15°, because the first rotating cam portion 31b provided on the support member abuts against the push rod 70 connected to the damper 60, when the closing operation of the manuscript pressing plate 3 is performed, after the rotation torque increases to a considerable extent, the acceleration of the manuscript pressing plate 3 during closing is absorbed by the action of the damper 60, and the manuscript pressing plate 3 will not only not fall rapidly, but also the user can smoothly perform the closing operation.

[0050] In addition, the hinge device 10 of the present invention is not only suitable for the copier 1, but also suitable for various items using the hinge device 10, such as printing machines, boxed containers, dining cabinets and other types of furniture, and its usage is as described above.

[0051] The structure of the present invention has been described above. This hinge device is particularly suitable for the opening and closing of a relatively light manuscript pressing plate with a high opening and closing frequency, and a copier equipped with the hinge device. However, as mentioned above, the application of the present invention is not limited to this. It is also suitable for hinge devices for double-piece opening and closing of various machines with the same purpose, as well as various machines equipped with this hinge device.

Claims

1. A hinge device, comprising: The mounting member is mounted on the side of the machine body, has a pair of side plates on the upper part, and is provided with a storage portion open upward inside; A supporting member, which is composed of a support shaft portion and a support portion extending forward from the support shaft portion, wherein the support portion is equipped with an original pressing plate; a hinge shaft that rotatably connects the fulcrum portion of the support member to between a pair of side plates of the mounting member; A sliding member, which can be slidably received in the receiving portion and has a slider cam protrusion on the top, and the slider cam protrusion and the support shaft portion are in a state of constant press-fit connection; an elastic member disposed between the bottom of the storage portion and the sliding member and biasing the sliding member toward the support shaft portion; a damper disposed in the elastic member; and A push rod, one end of which is detachably connected to the piston rod of the damper, and abuts against the support shaft at a predetermined closing angle when the manuscript pressing plate performs a closing action, and is slidably received in a guide cylinder, which is formed in the sliding member and has an opening at the top; The support shaft portion of the supporting member is provided with a recessed portion below the shaft insertion hole of the hinge shaft, the recessed portion is sandwiched between the first rotating cam portion and the second rotating cam portion, and the first rotating cam portion and the second rotating cam portion are asymmetrical when viewed from the axial direction, The first rotating cam portion and the second rotating cam portion control the opening and closing operation of the document pressing plate. When the document pressing plate is closed from a predetermined opening angle, the moving distance of the sliding member after being pressed by the first rotating cam portion is longer than the moving distance of the pushing rod. At the same time, when the supporting member is in a fully open state, the first rotating cam portion and the second rotating cam portion both clamp the hinge shaft and are abutted against the sliding member. 2 . The hinge device according to claim 1 , wherein the length of the guide tube portion is substantially equal to the length of the push rod. 3 . The hinge device according to claim 1 , wherein when the front end portion of the piston rod is connected to the push rod, the front end portion of the piston rod is inserted into a connection hole provided at a lower end portion of the push rod.

4. The hinge device according to claim 1, when the front end of the piston rod is connected to the push rod, the front end side of the piston rod and the lower end side of the push rod are connected by a pin, and the pin penetrates in the radial direction.

5. The hinge device according to claim 1, wherein the first rotating cam portion and the second rotating cam portion disposed on the support shaft portion sandwich the hinge shaft and are abutted against the top of the sliding member to limit the maximum rotation angle of the supporting member.

6. A machine comprising the hinge device according to any one of claims 1 to 5, a machine body, and a document pressing plate that opens and closes relative to the machine body.

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