JP2925939B2 - Copier cover support device - Google Patents

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 support device of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. 60-146232.
The copying machine includes a support member attached to the main body of the copying machine and a rotating member to which a cover of the copying machine is attached. The pivot member has a base end rotatably supported by the support member, and pivots between a closed position in which the cover is substantially horizontal and an open position in which the cover stands up. . An urging mechanism is provided between the support member and the rotating member. The biasing 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 thereof, and a cam follower provided between the cam follower and the rotating member. An elastic member that presses the cam follower against the cam surface and urges the rotating member away from the rotation axis, and opens the rotating member from the closed position side by the urging force of the elastic member. It is urged to the position side.

[0003] The magnitude of the urging force of the urging mechanism is set as follows. That is, a predetermined angle range (eg, 0 ° to 30 °) upward from a substantially horizontal closed position
In a predetermined angle range (e.g., 30 ° to 45 °), which is smaller than the cover's own weight and further upward, such that the cover rotates toward the closed position by its own weight,
Rotating the cover toward the open position in an angle range (e.g., 45 ° to 90 °) substantially equal to its own weight and from the open position to the open position so that the cover can be held at the stop position. Each is set to the size that can be.

[0004]

In the support device having the above structure, when the cover is released from the cover within a predetermined angle range on the closed position side, the cover is rotated toward the closed position by its own weight (hereinafter referred to as closed rotation). And rotation toward the open position is referred to as open rotation.) In addition, the cover is gradually accelerated toward the closed position and is closed at a relatively high speed. When the cover is closed and rotated at high speed, wind is generated with the rotation of the cover,
Due to this wind, there is a problem that the original placed on the original table is shifted from the original set position.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a support member attached to a body of a copying machine, a cover of the copying machine, and a base end portion having the above-mentioned structure. A rotating member rotatably supported by a supporting member between a closed position where the cover is substantially horizontal and an open position where the cover stands, and moving the rotating member from the closed position to the open position. A biasing mechanism for biasing the rotating member, wherein the biasing mechanism is provided on the cam surface provided on the support member, and on the rotating member so as to be movable in a direction approaching and separating from the rotation axis thereof. In a cover supporting apparatus of a copying machine having a cam follower pressed against the cam surface by an elastic member, a storage hole is formed in the support member, the storage hole being coaxial with the rotation axis of the rotation member. Inside, against the support member A movable member that is movable and rotated by the rotating member is disposed, a fixed surface portion extending in the circumferential direction inside the storage hole is provided on the support member so as not to rotate, and a fixed surface portion is provided on the movable member. A movable surface portion that rotates integrally with the rotating member while facing is provided, and a viscous fluid is interposed between a facing surface of the fixed surface portion and the movable surface portion. In this case, for the reason described later, the movable member is formed separately from the rotating member, and the rotating member rotates from the open position to the closed position between the movable member and the rotating member. In this case, the movable member is connected to the rotating member to rotate the two together, and when the rotating member rotates from the closed position to the open position, the connection between the rotating member and the movable member is made. It is desirable to provide a one-way clutch for disconnecting the vehicle. Further, the fixed surface portion and the movable surface portion are each formed as one or more cylindrical surfaces concentric with the storage hole inside the storage hole, and a cylindrical surface forming the fixed surface portion and a cylindrical surface forming the movable surface portion are formed. The fixed surface portion and the movable surface portion may be alternately arranged in the radial direction of the storage hole, or the fixed surface portion and the movable surface portion may be formed as one or more planes perpendicular to the axis of the storage hole inside the storage hole, respectively. May be alternately arranged in the axial direction of the storage hole.

[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, and the fixed surface portion and the movable surface portion are relatively rotated. As a result,
A shear resistance is generated in the viscous fluid interposed between the fixed surface portion and the movable surface portion. Due to this shear resistance, the closing rotation speed of the rotation member is suppressed to a low speed. When a 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, no shear resistance is generated in the viscous fluid. Therefore, the cover and the rotating member are lightened with a slight force,
In addition, it can be opened quickly.

[0007]

FIG. 1 to FIG. 6 show an embodiment of the present invention.
This will be described in detail with reference to FIG. FIGS. 1 to 4 show an embodiment of the present invention. A cover supporting device A of this embodiment includes a support member 1, a rotating member 2, an urging mechanism 3, a movable member 4, and a one-way clutch. 5 is provided.

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 support device A is provided. Is 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 one outer peripheral surface of the outer shell 12. 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 upper and lower ends of the cam surface 12a are formed.

Inside the outer shell 12, there is provided an outer cylinder 14 having one side connected to the outer shell 12 and the other side supported via ribs 13, 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 15 is formed at one end of the storage hole 14a. An inner cylindrical portion 16 coaxial with the outer cylindrical portion 14 is formed on the bottom portion 15, and a middle cylindrical portion 17 coaxial with the inner cylindrical portion 16 is formed between the outer cylindrical portion 14 and the inner cylindrical portion 16. I have. In addition, the outer cylinder part 1
4 and the inner cylindrical portion 16 are formed to have substantially the same length,
The middle cylinder part 17 is formed shorter than them.

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

Next, the urging mechanism 3 will be described. As shown in FIG. 1 and FIG. 4, the inside of the rotating member 2 extends from the base end face between the support arms 22, 22 to the tip end side. The guide hole 31 is formed to extend from the bottom surface of the guide hole 31 toward the distal end of the rotating member 2. Further, guide grooves 33, 33 extending to the bottom of the guide hole 31 along the support arm 22 are formed in the surfaces of the support arms 22, 22 facing each other.

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

When the roller 35 comes into contact with the lower stopper portion 12c, the rotating member 2 cannot rotate further downward. The turning position of the turning member 2 at this time is the closed position. In this closed position, the mounting surface 21 is 5 ° so that the distal end of the mounting surface 21 is located below the base end.
It is designed to incline to a degree. However, when the mounting surface 21 is horizontal, the cover of the copier abuts on the document table, so that the rotating member 2 does not actually rotate downward beyond the horizontal position. Further, the roller 35 is moved to the upper stopper portion 12b.
, The rotating member 2 cannot rotate further upward. The turning position at this time is the open position. In this 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 at the center, and a base end 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 concave portion 43 extending from the distal end surface toward the proximal end side, so that the outer cylindrical portion (movable cylindrical portion) 44 and the inner cylindrical portion coaxial with the through hole 41. (Movable cylinder) 45 in a double cylinder structure. The movable member 4 is provided with the storage hole 1.
4a is rotatably inserted inside. In this case, the inner cylindrical portion 16 of the support member 1 is inserted into the through hole 41,
The outer tube 44 is inserted between the inner peripheral surface of the storage hole 14a and the middle tube 17, and the inner tube 45 is connected to the middle tube 17 and the inner tube 16.
Has been inserted between.

Here, the cylindrical opposing surface 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, the inner peripheral surface of the outer cylindrical portion 44, Cylinder 45
And the inner peripheral surface of the through hole 41 are opposed to each other with a slight gap, and the gap 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, slits 46 are formed in the outer tube portion 44 and the inner tube portion 45 of the movable member 4, and are formed in consideration of circulation of a viscous fluid.

As is apparent from the above points, in this embodiment, each cylindrical surface of the support member 1 is a fixed surface portion, and each cylindrical surface of the movable member 4 is a movable surface portion. Has become. In this embodiment, the distal end surfaces of the bottom portion 15 and the intermediate cylindrical portion 17 of the support member 1 and the distal end surfaces of the outer cylindrical portion 44 and the inner cylindrical portion 45 of the movable member 4 opposed thereto,
In addition, a viscous fluid is also interposed between the bottom surface of the annular concave portion 43, and each of the former surfaces constitutes a part of the fixed surface portion, and each of the latter surfaces 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 for preventing the viscous fluid from leaking out therefrom are respectively mounted.

As shown in FIGS. 1 and 4, the one-way clutch 5 includes a clutch cylinder 51 and a clutch spring 5.
And 2. The clutch cylinder 51 is fitted to the outer periphery of the small-diameter cylindrical portion 42 of the movable member 4 and the locking claw 46 of the movable member 4 is fitted into the locking groove 51a, so that the clutch cylinder 51 rotates integrally with the movable member 4. It works. The clutch spring 52 has a coil shape and is fitted around the outer periphery of the clutch cylinder 51. The inner diameter of the clutch spring 52 is substantially the same as or slightly smaller than the outer diameter of the clutch cylinder 51. In addition, one end 52
a is locked to the rotating member 2. When the rotating member 2 rotates from the open position side to the closed position side, the clutch spring 52 contracts in diameter and fits tightly into the clutch cylinder 51. Then, the closing rotation of the rotating member 2 is transmitted to the movable member 4 via the clutch cylinder 51 by the friction between the clutch member 51 and the clutch cylinder 51. On the other hand, when the turning member 2 turns in the opening direction, the diameter of the clutch spring 52 expands. Therefore, in this case, the opening 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 support device 1 having the above configuration will be described. Now, it is assumed that the rotating member 2 is in the open position as shown by a solid line in FIG. When the rotating member 2 in the open position is rotated toward the closed position side to a horizontal position indicated by imaginary lines (a position where the cover abuts the dimming table), a predetermined angle range (for example, 90 ° to 30
Until °), the rotating member 2 is closed and rotated with the cover by hand. In the subsequent angular range up to the horizontal position, the own weight of the cover overcomes the urging force of the urging mechanism 3, so that when the hand is released from the cover, the cover and the rotating member 2 are closed and rotated by the own weight of the cover. At this time, the rotating member 2 is gradually accelerated toward the horizontal position side and attempts to close and rotate at a 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 supporting member 1. Occurs. This shearing force acts as a force that prevents the movable member 4 from rotating. In addition, 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 is suppressed to a low speed. In particular, in this embodiment, the support member 1 has a triple cylinder structure and the movable member 4 has a double cylinder structure. The movable surface portion of the member 4 can be widened, so that the shearing force generated in the viscous fluid can be increased. Therefore, the closing rotation of the rotating member 2 can be more reliably suppressed to a low speed. Therefore, it is possible to prevent the document on the document table from being shifted from the initial set 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 rest position where the biasing force of the biasing mechanism 3 and the weight of the cover are balanced, the cover is opened and rotated by hand. . At the time of this opening rotation, the movable member 4 does not rotate together with the rotation member 2 due to the action of the one-way clutch. Therefore, no shear force is generated in the viscous fluid. Therefore, the cover and the rotating member 2 can be opened and rotated lightly with a small force and at a high speed.

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

As shown in FIGS. 5 and 6, in the cover supporting apparatus B of this embodiment, both ends of the storage hole 14a are open, and a lid 7 having a through hole 71 at one end thereof. Are fitted and fixed in a liquid-tight manner by bonding or the like. A partition 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 14b. The storage chamber 14c is formed inside the storage hole 14a by the movable member 8, the lid 7, and the partition 14b. This storage chamber 14c is filled with a viscous fluid. Symbols 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 (two in this embodiment) fixing plates 9 having a thin ring shape are fitted on the inner peripheral surface of the storage hole 9 in the storage chamber 14c. On the outer periphery of the fixing plate 9,
An engagement projection 91 is formed, and the engagement projection 91 fits into an engagement groove 14d formed on the inner peripheral surface of the storage hole 14a, so that the fixing plate 9 rotates on the support member 1. Supported by the impossible.

The movable member 8 located in the storage chamber 14c has a large-diameter portion 81 formed therein. This large diameter portion 81
Has a plurality of thin rings (two in this embodiment)
Of the movable plate 10 are fitted. An engagement projection 101 is formed on the inner periphery of the movable plate 10.
The movable plate 10 rotates integrally with the movable member 4 by fitting the 01 into the engagement groove 82 formed in the large diameter portion 81. Further, the plurality of movable plates 10 are arranged alternately with the fixed plate 9, and the interval between the adjacent movable plate 10 and the fixed plate 9 or the partition 14 b is determined by the distance between the support member 1 and the movable member 4 in the above embodiment. It is almost the same as the interval between the opposed cylindrical surfaces.

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

In the cover supporting device B having the above structure,
When the turning member 2 is turned in the closing direction, the movable member 8 is turned together with the turning member 2 by the clutch spring 52. As a result, a shear force is generated in the viscous fluid between the opposing surfaces of the fixed plate 9 and the movable plate 10 (end surfaces of the plates 9 and 10) and between the movable plate 10 and the partition 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,
In this embodiment, the end surface of the fixed plate 9 facing the movable plate 10 and the end surface of the partition 14b are fixed surfaces, and the end surface of the movable plate 10 facing the end surfaces of the fixed plate 9 and the partitions 14b is a movable surface portion. I have.

[0027]

As described above, according to the first aspect of the present invention, when the cover and the turning member are closed and turned by the weight of the cover, the turning force of the turning member is generated by the shear force generated in the viscous fluid. The rotation speed can be kept low.
Therefore, it is possible to prevent the document placed on the document table from being displaced from the original set by the wind caused by the cover. Also, since the movable member, fixed surface portion, movable surface portion and one-way clutch are housed in the storage holes,
The effect that the whole can be reduced in size is obtained.
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 the drawings]

FIG. 1 is a view showing one embodiment of the present invention, and is a sectional view taken along line XX of FIG. 3;

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 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]

 DESCRIPTION OF REFERENCE NUMERALS A Copying machine cover supporting device B Copying machine cover supporting device 1 Support 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 17 Middle cylinder part 35 Roller (cam follower) 36 Elastic member 44 Outer cylinder part 45 Inner cylinder part

Claims (4)

(57) [Claims] 1. A support member attached to a body of a copying machine, a cover having a cover attached thereto, and a base end having a closed position where the cover is substantially horizontal to the support member and an open position where the cover stands upright. And a biasing mechanism for biasing the rotating member from the closed position side to the open position side, wherein the biasing mechanism is attached to the support member. The cam surface provided, and provided on the rotating member so as to be movable in a direction approaching and separating from the rotation axis thereof,
In a cover supporting apparatus of a copying machine having a cam follower pressed against the cam surface by an elastic member, a storage hole is formed in the support member, the storage hole being coaxial with the rotation axis of the rotation member. A movable member rotatable with respect to the supporting member and rotated by the rotating member, and a fixed surface portion extending in the circumferential direction inside the storage hole is fixed to the supporting member so as not to rotate. The movable member is provided with a movable surface portion that rotates integrally with the rotating member while facing the fixed surface portion, and a viscous fluid is interposed between the opposed surfaces of the fixed surface portion and the movable surface portion. Copier cover support device. 2. The movable member is formed separately from the rotating member, and between the movable member and the rotating member, when the rotating member rotates from the open position side to the closed position side. The movable member is connected to the rotating member and both are integrally rotated. When the rotating member rotates from the closed position to the open position, the connection between the rotating member and the movable member is disconnected. The apparatus according to claim 1, further comprising a one-way clutch. 3. The fixed surface portion and the movable surface portion are each formed as one or more cylindrical surfaces concentric with the storage hole inside the storage hole, and form a movable surface portion with the cylindrical surface forming the fixed surface portion. 3. The cover supporting device of a copying machine according to claim 1, wherein the cylindrical surface and the cylindrical surface are alternately arranged in a radial direction of the storage hole. 4. The fixed surface portion and the movable surface portion are each formed as one or more planes orthogonal to the axis of the storage hole inside the storage hole, and the plane forming the fixed surface portion and the plane forming the movable surface portion are respectively defined as the above-mentioned. 3. The cover supporting device of a copying machine according to claim 1, wherein the cover holes are alternately arranged in the axial direction of the storage holes.