JPH0836225A - Cover supporting device of copying machine - Google Patents

Abstract

PURPOSE:To keep the speed of a rotating member low in closing rotation and to rotate the member with low power in opening rotation. CONSTITUTION:An outer cylinder 14 with its inner peripheral surface used as a housing hole, an intermediate cylinder 17 connected to the outer cylinder 14 through the bottom 15 and an inner cylinder 16 are formed in a supporting member 1. A movable member 4 to be engaged with the outer periphery of the inner cylinder 16 with a gap in between is freely rotatably arranged in the housing hole. An outer cylinder 44 and an inner cylinder 45 are formed between the outer cylinder 14 and the intermediate cylinder 17 and between the intermediate cylinder 17 and the inner cylinder 16 respectively with a gap in between, in the movable member 4. A viscous fluid is interposed between the cylindrical opposed faces of the supporting member 1 and movable member 4. A one-way clutch 5 transmitting the rotation of a member 2 to the movable member 4 only in closing rotation is furnished between the movable member 4 and the rotating member 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover supporting device for rotatably supporting a cover for pressing a document placed on a document table of a copying machine.

[0002]

2. Description of the Related Art A conventional supporting device of this type is disclosed in, for example, Japanese Unexamined Patent Publication No. 60-146232.
It includes a support member attached to the main body of the copying machine and a rotating member to which the cover of the copying machine is attached. The base end of the rotary member is rotatably supported by the support member, and is rotatable between a closed position where the cover is substantially horizontal and an open position where the cover is upright. . A biasing mechanism is provided between the support member and the rotating member. The urging mechanism includes a cam surface provided on the support member, a cam follower provided on the rotating member so as to be movable toward and away from the rotation axis, and between the cam follower and the rotating member. It is provided with an elastic member that presses the cam follower against the cam surface and biases the rotating member so as to separate it from the rotating axis, and the rotating member is opened from the closed position side by the biasing force of the elastic member. It is designed to bias toward the position side.

The magnitude of the biasing force of the biasing mechanism is set as follows. That is, a predetermined angle range (for example, 0 ° to 30 °) that is directed upward from a substantially horizontal closed position.
In the above, in a predetermined angle range (for example, 30 ° to 45 °) that is smaller than the cover's own weight and further goes upward so that the cover rotates to the closed position side by its own weight,
In order to be able to hold the cover at its stop position, the cover is rotated to the open position side in the angular range from that position to the open position (for example, 45 ° to 90 °), which is almost equal to the weight of the cover. The size is set so that each can.

[0004]

In the supporting device having the above structure, when the hand is released from the cover within a predetermined angle range on the closed position side, the cover is rotated to the closed position side by its own weight (hereinafter referred to as closed rotation). The rotation to the open position side is referred to as the open rotation. Moreover, the cover is gradually accelerated toward the closed position and is rotated in the closing direction at a relatively high speed. When the cover closes and rotates at high speed, wind is generated as the cover rotates,
This wind causes a problem that the document placed on the document table is displaced from the original setting position.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a support member attached to the main body of a copying machine and a cover of the copying machine are attached, and the base end portion is the above-mentioned. A rotation member supported by a support member so as to be rotatable between a closed position where the cover is substantially horizontal and an open position where the cover is erected, and the rotation member facing from the closed position side to the open position side. And a biasing mechanism that biases the cam surface provided on the support member and the rotating member so as to be movable toward and away from the rotation axis. In a cover supporting device of a copying machine having a cam follower that is pressed against the cam surface by an elastic member, an accommodating hole that is concentric with the rotation axis of the rotating member is formed in the supporting member, and the accommodating hole Inside, with respect to the support member A movable member that is movable and that can be rotated by the rotating member is arranged, and a fixed surface portion that extends in the circumferential direction is provided inside the storage hole in the support member such that the movable member does not rotate. It is characterized in that a movable surface portion that rotates integrally with the rotating member while facing each other is provided, and a viscous fluid is interposed between opposed surfaces of the fixed surface portion and the movable surface portion. In this case, for a reason described later, the movable member is formed separately from the rotating member, and the rotating member rotates from the open position side to the closed position side between the movable member and the rotating member. In this case, the movable member is connected to the rotating member to rotate them integrally, and when the rotating member is rotated from the closed position side to the open position side, the connection between the rotating member and the movable member is performed. It is desirable to provide a one-way clutch for disconnecting. Further, the fixed surface portion and the movable surface portion are respectively formed inside the storage hole as one or more cylindrical surfaces concentric with the storage hole, and a cylindrical surface forming a fixed surface portion and a cylindrical surface forming a movable surface portion are formed. Alternatively, the fixed surface portion and the movable surface portion may be formed inside the storage hole as one or more planes orthogonal to the axis of the storage hole. The planes that form the planes and the planes that form the movable surface portions may be alternately arranged in the axial direction of the storage holes.

[0006]

When the cover and the rotating member are closed and rotated by the weight of the cover, the movable surface portion is rotated by the rotating member so that the fixed surface portion and the movable surface portion are relatively rotated. As a result,
Shear resistance is generated in the viscous fluid interposed between the fixed surface portion and the movable surface portion. The closing resistance of the rotating member is kept low by this shearing resistance. Further, when the one-way clutch is provided between the rotating member and the movable member, the movable member does not rotate when the cover and the rotating member are opened and rotated. Therefore, shear resistance does not occur in the viscous fluid. Therefore, the cover and the rotating member can be lightened with a little force,
Moreover, it can be opened and rotated quickly.

[0007]

Embodiments of the present invention will now be described with reference to FIGS.
This will be described in detail with reference to FIG. 1 to 4 show an embodiment of the present invention. A cover supporting device A of this embodiment includes a supporting member 1, a rotating member 2, an urging mechanism 3, a movable member 4 and a one-way clutch. 5 and.

The support member 1 has a shaft portion 11 extending vertically, and by inserting the shaft portion 11 into a support hole of a main body (not shown) of the copying machine, the entire supporting device A is copied. It is designed to be supported by the main body. As shown in FIG. 4, a cylindrical outer shell 12 is provided at the upper end of the shaft 11. A cam surface 12 a is formed on the outer peripheral surface of one side of the outer shell 12. Further, on the outer peripheral surface of the outer shell portion 12, an upper stopper portion 12b and a lower stopper portion 12c which are respectively adjacent to the upper and lower end portions of the cam surface 12a are formed.

Inside the outer shell portion 12, an outer cylinder portion 14 is provided, one side portion of which is connected to the outer shell portion 12 and the other side portion of which is supported via ribs 13 and 13. This outer cylinder part 14
Is provided with its axis oriented in the horizontal direction, and the inside thereof is a storage hole 14a. As shown in FIG. 1, a bottom portion 15 is formed at one end of the storage hole 14a. The bottom portion 15 has an inner tubular portion 16 concentric with the outer tubular portion 14 and an intermediate tubular portion 17 concentric therewith formed between the outer tubular portion 14 and the inner tubular portion 16. There is. The outer cylinder part 1
4 and the inner cylindrical portion 16 are formed to have substantially the same length,
The middle tubular portion 17 is formed shorter than them.

As shown in FIGS. 2 and 3, the rotating member 2 is formed in a plate shape, and a flat mounting portion 21 is formed on one surface thereof. A cover (not shown) of the copying machine is attached to the attachment portion 21. Support arm portions 22, 22 are formed on both sides of the base end portion of the rotating member 2 so as to project. As shown in FIGS. 1 and 4, the support arm portions 22 and 22 are formed with insertion holes 22a and 22a whose axes are aligned with each other. The rotating member 2 is rotatably supported by the supporting member 1 through the shaft 6 that penetrates the insertion holes 22a, 22a and the inner cylindrical portion 16 of the supporting member 1.

Next, the urging mechanism 3 will be described. As shown in FIGS. 1 and 4, inside the rotating member 2, the urging mechanism 3 extends from the base end face between the support arm portions 22, 22 toward the front end side. The guide hole 31 extending in the vertical direction is formed, and the spring accommodating holes 32, 32 extending further from the bottom surface of the guide hole 31 toward the tip side of the rotating member 2 are formed. Guide grooves 33, 33 extending along the support arm 22 to the bottom of the guide hole 31 are formed on the surfaces of the support arms 22, 22 facing each other.

A spring receiver 34 is movably inserted in the guide hole 31, and both ends of a roller (cam follower) 35 are movably inserted in the guide grooves 33, 33. The roller 35 is biased toward the base end side of the rotating member 2 via the spring receiver 34 by the compression coil springs 36, 36 inserted into the spring housing holes 32, 32, and is pressed against the cam surface 12a. The compression coil spring 36 urges the rotating member 2 to rotate upward about the shaft 6.

When the roller 35 hits the lower stopper portion 12c, the rotating member 2 cannot rotate further downward. The rotating position of the rotating member 2 at this time is the closed position. In this closed position, the mounting surface 21 is 5 ° so that the tip of the mounting surface 21 is located below the base end.
It is designed to be inclined. However, when the mounting surface 21 becomes horizontal, the cover of the copying machine abuts against the document table, so that the rotating member 2 does not actually rotate downward beyond the horizontal position. Further, the roller 35 is the upper stopper portion 12b.
When it hits against, the rotating member 2 cannot rotate any more upward. The rotating position at this time is the open position. In the open position, the mounting surface 21 stands up at an angle of 80 to 90 ° with respect to the horizontal line.

The movable member 4 is formed as a cylinder having a through hole 41 in the center thereof, and the base end portion thereof is a small diameter cylindrical portion 42. On the other hand, the distal end portion of the movable member 4 is formed with an annular recess 43 extending from the distal end surface toward the base end side, so that the outer tubular portion (movable tubular portion) 44 and the inner tubular portion which are concentric with the through hole 41. (Movable cylinder portion) 45 and has a double cylinder structure. The movable member 4 has the storage hole 1
It is rotatably inserted inside 4a. In this case, the inner cylindrical portion 16 of the support member 1 is inserted into the through hole 41,
The outer tubular portion 44 is inserted between the inner peripheral surface of the storage hole 14 a and the middle tubular portion 17, and the inner tubular portion 45 is inserted into the middle tubular portion 17 and the inner tubular portion 16.
Has been inserted between and.

Here, the cylindrical facing surfaces of the support member 1 and the movable member 4, that is, the storage hole 1 of the support member 1
4a, the outer peripheral surface and the inner peripheral surface of the middle cylindrical portion 17, and the outer peripheral surface of the inner cylindrical portion 16, the outer peripheral surface of the movable member 4 and the inner peripheral surface of the outer cylindrical portion 44, which face each other. Tubular part 45
The outer peripheral surface and the inner peripheral surface of the through hole 41 face each other with a slight clearance, and the clearance is filled with a viscous fluid (not shown). As the viscous fluid, for example, a polymer viscous fluid such as polyisobutylene, pitch, or water glass is used. As shown in FIG. 4, the outer cylinder portion 44 and the inner cylinder portion 45 of the movable member 4 are provided with slits 46, which are formed in consideration of the circulation of the viscous fluid.

As is apparent from the above points, in this embodiment, the cylindrical surfaces of the supporting member 1 are fixed surface portions, and the cylindrical surfaces of the movable member 4 are movable surface portions. Has become. In addition, in this embodiment, the tip surfaces of the bottom portion 15 and the middle tubular portion 17 of the support member 1 and the respective tip surfaces of the outer tubular portion 44 and the inner tubular portion 45 of the movable member 4 facing the bottom portion 15,
The viscous fluid is also interposed between the bottom surface of the annular recess 43 and each surface of the former constitutes a part of the fixed surface portion, and each surface of the latter constitutes a part of the movable surface portion. In addition, between the outer peripheral surface of the inner cylindrical portion 16 of the support member 1 and the inner peripheral surface of the movable member 4, and between the inner peripheral surface of the storage hole 14 of the support member 1 and the outer peripheral surface of the movable member 4, O-rings R ₁ and R ₂ are attached to prevent the viscous fluid from leaking to the outside.

As shown in FIGS. 1 and 4, the one-way clutch 5 includes a clutch cylinder 51 and a clutch spring 5.
2 and. The clutch cylinder 51 is fitted to the outer periphery of the small-diameter cylinder portion 42 of the movable member 4, and the locking claw portion 46 of the movable member 4 is fitted into the locking groove 51a to rotate integrally with the movable member 4. It is designed to move. The clutch spring 52 has a coil shape and is fitted around the outer circumference of the clutch cylinder 51. The inner diameter of the clutch spring 52 is substantially the same as the outer diameter of the clutch cylinder 51 or slightly smaller. Also, the one end 52
a is locked to the rotating member 2. Then, when the rotating member 2 rotates from the open position side to the closed position side, the clutch spring 52 contracts in diameter and tightly fits into the clutch cylinder 51. Then, due to friction with the clutch cylinder 51, the closed rotation of the rotating member 2 is transmitted to the movable member 4 via the clutch cylinder 51. On the other hand, when the rotating member 2 rotates in the opening direction, the diameter of the clutch spring 52 increases. Therefore, in this case, the open rotation of the rotating member 2 is not transmitted to the movable member 4 by the clutch spring 52.

Next, the operation of the cover supporting device 1 having the above structure will be described. Now, it is assumed that the rotating member 2 is in the open position as shown by the solid line in FIG. When the rotating member 2 in the open position is rotated toward the closed position toward the horizontal position indicated by the imaginary line (the position where the cover abuts the dimming table), a predetermined angular range (for example, 90 ° ~ 30
Up to (°), the cover is manually rotated to close and rotate the rotating member 2. In the subsequent angular range up to the horizontal position, the weight of the cover overcomes the urging force of the urging mechanism 3, so when the hand is released from the cover, the cover and the rotation member 2 are closed and rotated by the weight of the cover. At this time, the rotating member 2 is gradually accelerated toward the horizontal position and tends to close and rotate at high speed.
However, since the movable member 4 rotates following the rotation of the rotating member 2 when the rotating member 2 is closed, the shearing force is applied to the viscous fluid interposed between the movable member 4 and the support member 1. Occurs. This shearing force acts as a force that prevents the movable member 4 from rotating. Moreover, the shearing force increases as the movable member 4 rotates at a higher speed. Therefore, the closing rotation speed of the cover and the rotation member 2 can be suppressed to a low speed. In particular, in this embodiment, since the support member 1 has a triple tube structure and the movable member 4 has a double tube structure, the opposing surfaces of the support member 1 and the movable member 4, that is, the fixed surface portion of the support member 1 and the movable member 4 are movable. The movable surface portion of the member 4 can be widened, whereby the shearing force generated in the viscous fluid can be increased. Therefore, the closed rotation of the rotating member 2 can be suppressed more reliably at a low speed. Therefore, it is possible to prevent the document on the document table from being displaced from the original setting position due to the wind generated by the cover.

On the other hand, when the rotating member in the horizontal position is opened and rotated to the open position or the stationary position where the urging force of the urging mechanism 3 and the own weight of the cover are balanced, the cover is manually opened and rotated. . At the time of this open rotation, the movable member 4 does not rotate together with the rotating member 2 due to the action of the one-way clutch. Therefore, no shearing force is generated in the viscous fluid. Therefore, the cover and the rotating member 2 can be opened and rotated at a high speed with a small force and light weight.

Next, another embodiment of the present invention shown in FIGS. 5 and 6 will be described. In this embodiment, only the points different from the above embodiment will be described, the same parts as those in the above embodiment will be designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIGS. 5 and 6, in the cover supporting device B of this embodiment, both ends of the storage hole 14a are opened, and the lid 7 having the through hole 71 at the opening at one end thereof. Are fitted and fixed in a liquid-tight manner by adhesion or the like. Further, a partition wall 14b is formed in the middle of the storage hole 14a.

A cylindrical movable member 8 is rotatably fitted on the outer periphery of the support shaft 6. The outer periphery of the movable member 8 is rotatably fitted to the through hole 71 of the lid 7 and the inner periphery of the partition wall 14b. A storage chamber 14c is formed inside the storage hole 14a by the movable member 8, the lid 7 and the partition wall 14b. The storage chamber 14c is filled with a viscous fluid. Reference characters R ₃ and R ₄ are O for preventing the viscous fluid in the storage chamber 9 from leaking to the outside.
It is a ring.

A plurality of thin ring-shaped (two in this embodiment) fixing plates 9 are fitted to the inner peripheral surface of the storage hole 9 in the storage chamber 14c. On the outer periphery of this fixed plate 9,
Engagement protrusions 91 are formed, and the engagement protrusions 91 are fitted into the engagement grooves 14d formed on the inner peripheral surface of the storage hole 14a, whereby the fixed plate 9 rotates on the support member 1. It is imperatively supported.

A large diameter portion 81 is formed on the movable member 8 located inside the storage chamber 14c. This large diameter part 81
Includes a plurality of thin ring shapes (two in this embodiment).
The movable plate 10 is fitted. An engaging protrusion 101 is formed on the inner periphery of the movable plate 10, and the engaging protrusion 1
By fitting 01 into the engaging groove 82 formed in the large diameter portion 81, the movable plate 10 rotates integrally with the movable member 4. Further, the plurality of movable plates 10 are arranged alternately with the fixed plate 9, and the distance between the adjacent movable plate 10 and the fixed plate 9 or the partition wall 14b is the same as that of the support member 1 and the movable member 4 in the above embodiment. It is almost the same as the interval between the opposing cylindrical surfaces.

In this embodiment, the clutch cylinder 51 in the above embodiment is not used, but the clutch spring 52 is directly fitted to the movable member 4.

In the cover supporting device B having the above structure,
When the rotating member 2 is rotated in the closing direction, the movable member 8 is rotated together with the rotating member 2 by the clutch spring 52. As a result, a shearing force is generated in the viscous fluid between the facing surfaces of the fixed plate 9 and the movable plate 10 (end faces of the plates 9 and 10) and between the movable plate 10 and the partition wall 14b. Therefore, it is possible to prevent the cover and the rotating member 2 from closing and rotating at high speed. As is clear from the above contents,
In this embodiment, the end surface of the fixed plate 9 and the end surface of the partition wall 14b facing the movable plate 10 are fixed surface portions, and the end surface of the movable plate 10 facing the end surface of the fixed plate 9 and the partition wall 14b are the movable surface portion. There is.

[0027]

As described above, according to the first aspect of the present invention, when the cover and the rotating member are closed and rotated by the weight of the cover, the shearing force generated in the viscous fluid causes the rotating member to rotate. The rotation speed can be suppressed to a low speed.
Therefore, it is possible to prevent the document placed on the document table from being displaced from the original set due to the wind from the cover. Further, since the movable member, the fixed surface portion, the movable surface portion and the one-way clutch are stored in the storage hole,
The effect that the whole can be miniaturized is acquired.
According to the invention of claim 2, in addition to the effect of the invention of claim 1, when the rotating member and the cover are opened and rotated, they can be rotated with a small force and at a high speed. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention and is a sectional view taken along line XX of FIG.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a side view of the embodiment.

FIG. 4 is an exploded perspective view of the same embodiment.

FIG. 5 is a sectional view similar to FIG. 1, showing another embodiment of the present invention.

FIG. 6 is an exploded perspective view of a main part of the embodiment.

[Explanation of symbols]

 A cover supporting device for copying machine B cover supporting device for copying machine 1 supporting member 2 rotating member 3 urging mechanism 4 movable member 5 one-way clutch 8 movable member 9 fixed plate 10 movable plate 12a cam surface 14a storage hole 16 inner cylinder portion 17 Middle Tube Section 35 Roller (Cam Follower) 36 Elastic Member 44 Outer Tube Section 45 Inner Tube Section

Claims (4)

[Claims] 1. A support member attached to a main body of a copying machine, a cover of the copying machine is attached, and a base end portion of the support member has a closed position in which the cover is substantially horizontal and an open position in which the cover is erected. And a biasing mechanism that biases the rotary member from the closed position side toward the open position side, and the biasing mechanism serves as the support member. The provided cam surface and the rotating member are provided so as to be movable in a direction toward and away from the rotating axis line,
In a cover supporting device of a copying machine having a cam follower that is pressed against the cam surface by an elastic member, a storage hole that is concentric with the rotation axis of the rotating member is formed in the support member, and the inside of the storage hole is formed. A movable member that is rotatable with respect to the support member and that can be rotated by the rotation member, and a fixed surface portion that extends in the circumferential direction inside the storage hole is fixed to the support member so as not to rotate. And a viscous fluid intervening between the facing surfaces of the fixed surface portion and the movable surface portion, wherein the movable member is provided with a movable surface portion that rotates integrally with the rotating member while facing the fixed surface portion. Cover support device for copiers. 2. The movable member is formed separately from the rotating member, and when the rotating member is rotated from the open position side to the closed position side between the movable member and the rotating member. The movable member is connected to the rotating member to rotate them integrally, and when the rotating member is rotated from the closed position side to the open position side, the connection between the rotating member and the movable member is cut off. The cover supporting device for a copying machine according to claim 1, further comprising a one-way clutch. 3. The fixed surface portion and the movable surface portion are formed inside the storage hole as one or more cylindrical surfaces that are concentric with the storage hole, and form a fixed surface portion and a movable surface portion. 3. The cover supporting device for a copying machine according to claim 1, wherein the cylindrical surface and the cylindrical surface are alternately arranged in the radial direction of the storage hole. 4. The fixed surface portion and the movable surface portion are respectively formed inside the storage hole as one or more planes orthogonal to the axis of the storage hole, and a plane forming the fixed surface portion and a plane forming the movable surface portion are formed. 3. The cover supporting device for a copying machine according to claim 1, wherein the cover supporting devices are arranged alternately in the axial direction of the storage holes.