JPH11123689A - Multi-step sliding arm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To laterally move a work by a distance equivalent to two times as long as the sum of the length of a first rodless cylinder and the length of a second rodless cylinder, and make a multi-step sliding arm compact. SOLUTION: A work W can be laterally moved from a front side endmost part to a rear side endmost part or reversely by letting the cylinder 33b of a first rodless cylinder 33 be fully extended to the front side or the rear side around a moving member 8, and furthermore, letting a second rodless cylinder 39 be fully extended with respect to the first rodless cylinder 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a multi-stage slide arm used for a transfer device or the like.

[0002]

2. Description of the Related Art As a multi-stage slide arm, for example, Japanese Patent Publication No. 59-1651, "Plate-like object transfer device" and Japanese Utility Model Publication No. 48-13978, "Arm device for industrial manipulator" are known. In the above, as shown in FIG. 1 of the publication, a suspension frame 6 is movably mounted on a fixed guide rail 5, and a movable guide rail 10 is attached to the suspension frame 6.
Is movably mounted, and a movable frame 11 is movably mounted on the moving guide rail 10. Further, a forward / reverse rotation motor 19 for driving the suspension frame 6 is provided on the fixed guide rail 5, a forward / reverse rotation motor 24 for driving the movement guide rail 10 is provided on the suspension frame 6, and the movement guide rail 10 runs on the movable frame 11 by itself. A forward / reverse rotation motor 27 is provided. As shown in FIG. 2 of the publication, a bracket 2 is movably mounted on a guide rail 1, a support cylinder 8 is mounted on the bracket 2 via a vertical arm 4, and a horizontal arm 7 is mounted on the support cylinder 8. Is movably mounted.

[0003]

However, in the above, the moving guide rail 10, the suspension frame 6, and the movable frame 11 are provided with forward / reverse rotation motors 19, 24, and 27 as driving means, respectively, and these forward / reverse rotation motors 19 are provided. , 24, 27, it is necessary to increase the rigidity of the guide rails and the frame because the transfer device becomes large and the weight increases. In the above, the bracket 2 that slides on the guide rail 1 and the horizontal arm 7 that slides on the bracket 2 via the vertical arm 4 and the support cylinder 8 constitute a multi-stage slide arm, but the support cylinder 8 is interposed. Therefore, the amount of movement cannot be increased.

Accordingly, an object of the present invention is to provide a multi-stage slide arm which is compact and has a large moving amount.

[0005]

In order to achieve the above object, according to the present invention, a moving member 33a of a first rodless cylinder 33 is mounted on a base member 8, and the first rodless cylinder 33 is attached to the moving member 33a. The cylinder 33b is movably mounted, and the cylinder 33b is mounted in parallel with the cylinder 33b.
b. A bracket 34 having the same length as
4, the second rodless cylinder 39 is attached to the second rodless cylinder 39 so that the cylinder 39a or the moving element 39b of the second rodless cylinder 39 is selectively connected.
9, a slide member 37 having the same length as the cylinder 39a is attached in parallel with the cylinder 39a, and a suspension slider 38 for suspending the work W is slidably attached to the slide member 37, and the suspension slider 38 is attached to the slide member 37 or the third member. When the movable member 39b of the second rodless cylinder 39 is selectively coupled to the movable member 39b, and when the movable member 39b is selected, the bracket 34 is coupled to the cylinder 39a of the second rodless cylinder 39 and the slide member 37 is selected. Bracket 3
The multi-stage slide arm 30 is provided with a clutch mechanism 41 that couples the slide arm 4 to the slide member 37.

[0006] The cylinder 33b of the first rodless cylinder 33 is fully extended to the front side or the rear side with the base member 8 as a center.
3, the second rodless cylinder 33 is fully extended, and the workpiece W can be laterally moved from the frontmost end to the rearmost end, or vice versa.

[0007] The second rodless cylinder 39
Mover stopper member 55 for locking mover 39b
A cylinder stopper member 56 for locking the cylinder 39a of the second rodless cylinder 39, and a driving means 54 for driving the stopper members 55, 56 to the lock / unlock side at one end of the bracket 34; A mover stopper member 58 for locking the mover 39b of the second rodless cylinder 39;
The cylinder 34 includes a cylinder stopper member 59 for locking the cylinder 39b and a driving means 57 for driving the stopper members 58 and 59 to the lock / unlock side.
, The clutch mechanism 41 is provided at the other end. Since the clutch mechanism 41 is constituted by the pair of mover stopper members 55 and 58, the pair of cylinder stopper members 56 and 59, and the pair of driving means 54 and 57, the clutch mechanism 41 can be simplified.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. Fr indicates the front side, and Rr indicates the rear side. FIG. 1 is a perspective view of a transfer device according to the present invention.
The transfer device 1 includes a trolley 2 as a base, a pair of left and right support arms 3 and 3 movably attached to the trolley 2, and balancer mechanisms 5 and 5 (for preventing the support arms 3 and 3 from falling down). Only one of them is shown), a cross member 7 extending over the distal ends of the support arms 3, 3, a moving member 8 movably mounted along the cross member 7, and a cross member horizontally mounted on the moving member 8. The multi-stage slide arm 30 is provided with a multi-stage slide arm 30 for extending and contracting the arm in a direction perpendicular to the direction 7, and a gripping mechanism 60 attached to the multi-stage slide arm 30. W indicates a work.

FIG. 2 is a side view of the transfer device according to the present invention. The truck 2 is configured by mounting wheels 12 to the body frame 11 (where a plurality is shown, the same applies hereinafter), and mounting portions 11a and 11c for mounting the support arm 3 and a cylinder 17 to be described later. Support portion 11b for
The balancer mechanism 5 includes support shafts 11d, 11e, 11f and mounting portions 11g, 11g. The support arm 3 is a first parallel link 1 having one end attached to the carriage 2 so as to be vertically movable.
3 and the first parallel link 13 fitted to the other end of the first parallel link 13.
A connecting member 14, a second parallel link 15 having one end rotatably attached to the first connecting member 14, and a second connecting member 16 attached to a tip of the second parallel link 15 for attaching the cross member 7. And an air cylinder 17 for driving the support arm 3. Since the carriage 2 is attached to the transfer device 1, the transfer device 1 can be freely moved.

The first parallel link 13 includes a first main link 18, a first sub link 19 disposed in parallel with the first main link 18, and a first gear portion 18 a provided at one end of the first main link 18. Consists of First connecting member 14
Is a member connecting the first parallel link 13 and the second parallel link 15 so as to be relatively movable, and a support portion 14a for rotatably mounting the rod 17a of the air cylinder 17 and a rotatable mounting for the first main link 18. A supporting shaft 14b, a supporting shaft 14c for rotatably mounting the first sub-link, and a second
Support shafts 14d and 14 for rotatably mounting the parallel link 15
e.

The second parallel link 15 includes a second main link 21, a second sub link 22 disposed in parallel with the second main link 21, and a second gear 21 a provided at one end of the second main link 21. Consists of Second connecting member 16
Are supporting portions 16a, 1 for attaching the cross member 7.
6a, a support shaft 16b for rotatably mounting the second main link 21, and a support shaft 16c for rotatably mounting the second sub-link 22. The support arm 3 is attached to the cart 2
The parallel link 13 is attached so as to be vertically movable, a first gear portion 18a is attached to the tip of the first parallel link 13, and a second gear portion 21a meshing with the first gear portion 18a is provided. Since the second parallel link 15 is attached to the support arm 3, the support arm 3 can operate the work W only in vertical movement.

The balancer mechanism 5 includes a spring holder 23 mounted on the mounting portions 11g of the body frame 11, a compression spring 24 housed in the spring holder 23, and a pressing member 27 for pressing the compression spring against the spring holder 23. ,
A wire 26 is provided as a flexible linear member connecting between the pressing member 27 and the support shaft 14c. Pulley 25a,
25 b and 25 c are pulleys for changing the direction of the wire 26. The spring holder 23 includes a stopper 23a for receiving the compression spring 24 and a holder 23b for covering the outer periphery of the compression spring 34. As described later, the balancer mechanism 5
Is to keep the equilibrium state constantly in conjunction with the movement of the support arm 3.

FIG. 3 is a view taken in the direction of arrow 3 in FIG.
The side of is shown. The cross member 7 includes a second connecting member 16,
16 and supported by the second parallel links 15 and 15 via a support member body 28.
And a rodless cylinder 29 mounted along.
The rodless cylinder 29 includes a cylinder 29a and a moving element 29b that moves the cylinder 29a. The moving member 8 is connected to the moving element 29b, and can move the member main body 28 with the movement of the moving element 29b.

FIGS. 4A and 4B are explanatory views of a multi-stage slide arm according to the present invention, wherein FIG. 4A shows a plane view of the multi-stage slide arm, and FIG. 4B shows a side surface of the multi-stage slide arm. The multi-stage slide arm 30 includes a first arm 31 slidably attached to the cross member 7 via the moving member 8 and a second arm 32 slidably attached to the first arm 31. First arm 31
A moving member 33a of the first rodless cylinder 33 attached to the moving member 8 as a base member;
The first rodless cylinder 33 movably mounted in a
, A bracket 34 attached to the cylinder 33b, a guide rail 35 provided on the bracket 34, and a linear slider 35a that slidably moves the guide rail 35. Since the first rodless cylinder 33 has the moving member 33a attached to the moving member 8, the moving member 33a moves on the cylinder 33b by supplying compressed air to the cylinder 33b.

The second arm 32 is movably mounted on a guide rail 35 via a linear slider 35a, a slide member 37 mounted on the guide rail 36, and slidably mounted on the slide member 37. A suspension slider 38, a cylinder 39a of a second rodless cylinder 39 mounted along the slide member 37, and a movable member 39b of the second rodless cylinder 39 movably mounted in the cylinder 39a. The moving element 39b is a member attached to the linear slider 35a and moves together with the linear slider 35a, and the suspension slider 38 is a member for suspending the gripping mechanism 60. The second rodless cylinder 39 fixes the mover 39b to the first arm 31 and supplies compressed air to the cylinder 39a, so that the cylinder 39a
9b. When the cylinder 39a is fixed to the first arm 31, the moving element 39b moves on the cylinder 39a by supplying compressed air to the cylinder 39a.

Around the moving member 8, the cylinder 33b of the first rodless cylinder 33 is fully extended to the front side or the rear side.
, Fully extend the second rodless cylinder 39,
The workpiece W can be laterally moved from the frontmost end to the rearmost end, or vice versa. That is, the length of the first rodless cylinder 33 and the length of the second rodless cylinder 39
The workpiece W can be moved laterally by a distance corresponding to twice the sum of the length and the length of the workpiece W. And such a multi-stage slide arm 30 can be configured compactly.

The clutch mechanism 41 includes the slide member 37, the suspension slider 38, the moving member 39b of the second rodless cylinder 39, the front cylinder unit 42 provided at one end of the bracket 34, and the And a rear cylinder unit 43 provided. The clutch mechanism 41 will be described with reference to the following drawings.

FIG. 5 is an enlarged view of a main part of the second arm shown in FIG.
7 and the mover 39b are shown. The slide member 37 has holes 37a and 37b into which the suspended slider body 45 is fitted. The suspension slider 38 includes a suspension slider body 45, lock claws 46 a and 46 b rotatably attached to the suspension slider body 45, and a leaf spring 47 that presses the lock claws 46 a and 46 b. When the lock claw 46a is fitted in the hole 37a of the slide member 37 or the lock claw 46b is fitted in the hole 37b, the suspension slider 38 moves together with the slide member 37.

The moving element 39b includes a frame 51 mounted on the moving element body 49, fitting claws 52a and 52b rotatably mounted on the frame 51, and fitting claws 52a and 52b.
And a leaf spring 57 that presses the leaf spring 52b. The spring force of the leaf spring 47 is set to be larger than the spring force of the leaf spring 53. Accordingly, at positions where the lock claws 46a, 46b of the slide member 37 contact the fitting claws 52a, 52b, the fitting claws 52a,
52b pushes the lock claws 46a, 46b, and the moving element 39b
Connects the suspension slider 38 and the suspension slider 38
Moves together with the mover 39b.

FIG. 6 is an enlarged view of a main part of the first arm shown in FIG. 4B, showing the front cylinder unit 42 and the rear cylinder unit 43. The front cylinder unit 42 includes a cylinder 54 serving as a driving means attached to the bracket 34 so as to be able to swing, and a cylinder 5
Mover stopper member 55 fitted to the rod 54a
And a cylinder stopper member 56. Cylinder 5
Reference numeral 4 drives the mover stopper member 55 and the cylinder stopper member 56. Mover stopper member 55
Is provided on the front side of the first arm 31 with a fitting claw 52a (FIG. 5).
(See FIG. 3), the movable member 39b is locked to the first arm 31 side.

The rear cylinder unit 43 includes a cylinder 57 as a driving means mounted on the bracket 34 so as to be swingable, a movable member stopper member 58 and a cylinder stopper member 5 fitted to a rod 57a of the cylinder 57.
9 The cylinder 57 includes the movable member stopper member 5.
8 and the cylinder stopper member 59 are driven. The movable member stopper member 58 locks the movable member 39b to the first arm 31 side by fitting the movable member 39b to the fitting claw 52b (see FIG. 5) on the rear side of the first arm 31.

The cylinder stopper member 55 is
9a is a stopper for locking or releasing the front end of the cylinder 9a.
This is a stopper for locking or releasing the rear end of the lock.
Therefore, by raising the cylinder stopper members 55 and 39 in a state where the cylinder 39a is located in the first arm 31, the cylinder 39a is locked to the first arm 31 side. When the cylinder stopper member 55 is opened, the cylinder 39a can move to the front side,
When the cylinder stopper member 59 is opened, the cylinder 39
a can be moved to the rear side.

That is, a pair of movable member stopper members 5
5 and 58 and a pair of cylinder stopper members 56 and 59
And the pair of driving means 54 and 57 constitute the clutch mechanism 41, so that the clutch mechanism 41 can be simplified. Then, the cylinder 39a of the second rodless cylinder 39 can be reliably switched between the cylinder 39a of the second rodless cylinder 39 and the movable member 39b of the second rodless cylinder 39. The relative movement of the 39 moving elements 39b can be smoothly performed.

The operation of the transfer device 1 described above will now be described. FIGS. 7A to 7C are explanatory diagrams of a first operation of the transfer device according to the present invention. (A) shows that the workpiece W was gripped by the gripping mechanism 60. (B), the bent first parallel link 13 is raised clockwise in FIG.
The parallel link is raised in the counterclockwise direction in the figure, and the work W is lifted as indicated by the arrow. The first parallel link 13 and the second parallel link 15 are connected to the first gear portion 18a and the second gear portion 2 of FIG.
The work W is vertically moved by the distance A as shown by an arrow because the work W is linked at 1a. At this time, no horizontal force is applied to the work W. That is, by moving one of the first and second parallel links 13 and 15, the first and second gear portions 18a and 21a are moved.
The other parallel links 13 and 15 can be linked via the. (C) moves the second arm 32 as shown by the arrow, and moves the second arm 32 within the range of the first arm 31.
To store. By moving the second arm 32 as shown by the arrow, the work W is moved horizontally by the distance B1.

FIGS. 8A and 8B are explanatory views of a second operation of the transfer device according to the present invention. (A) shows that the suspension slider 43 was moved as shown by the arrow. By moving the suspension slider 43 as shown by the arrow, the work W is further horizontally moved by the distance B2. (B) shows that the first arm 31 has been moved by the distance B3 as shown by the arrow. By moving the first arm 31, the workpiece W is further horizontally moved by the distance B3 in the direction of the arrow. The workpiece W gripped by the gripping mechanism 60 can be passed between the pair of left and right support arms 3 and 3 (only one is shown), and the workpiece W can be transferred along the shortest transfer path.

FIGS. 9A and 9B are diagrams for explaining a third operation of the transfer device according to the present invention. (A) shows the second arm 3
2 is moved as shown by the arrow, and the second arm 32 is projected from the first arm 31. By moving the second arm 32 as shown by the arrow, the work W moves horizontally by the distance B. (B), the first and second parallel links 13 and 15 are bent, and the work W is lowered as indicated by arrows. Since the first parallel link 13 and the second parallel link 15 are linked by the first gear portion 18a and the second gear portion 21a in FIG. 2, the work W moves vertically by the distance A as indicated by the arrow.

FIGS. 10A and 10B are explanatory diagrams of the operation of the balancer mechanism according to the present invention. (A) shows that the first and second parallel links 13 and 15 are extended, so that a compression spring 24 is formed.
Indicates a state extended in the direction of the arrow, and its length is L1. Therefore, the balance acting on the support shaft 14c of the first connecting member 14 is minimum. (B) shows that the length of the compression spring 24 pressed by the holding member 27 becomes L2 because the wire 26 is pulled as shown by the arrow by bending the first and second parallel links 13 and 15. . here,
The increased balance amount is F, and the spring constant of the compression spring 24 is k.
Then, F = k (L1−L2). in this way,
The amount of balance acting on the support shaft 14c of the first connecting member 14 increases as the first and second parallel links 13 and 15 are bent.

As shown in the figure, the balancer mechanism 5 is
, And the wire 26 connecting the free end of the compression spring 24 and the support arm 3, the balance state can be always maintained in conjunction with the movement of the support arm 3.

Next, the operation of the multi-stage slide arm 30 will be described. 11 (a) to 11 (c) are explanatory diagrams (first half) of the operation of the multi-stage slide arm according to the present invention, in which a white triangle indicates an unlocked or unlocked state, and a black triangle indicates a locked or coupled state. Indicates that there is. (A): Indicates that the work W is at the frontmost end, the suspension slider 38 that suspends the work W is connected to the slide member 37, and the bracket 34 of the first arm 31 is connected to the mover 39b. More specifically, by fitting the lock claw 46 a into the hole 37 a of the slide member 37, the suspension slider 38 is locked to the slide member 37. Further, the movable member 39b is locked to the first arm 31 side by fitting the movable member stopper member 55 to the fitting claw 52a. To move the workpiece W to the rear side as indicated by the arrow a, the movable member 39b is set to the "fixed side" and the cylinder 39a
May be moved to the “moving side” to move the cylinder 39a.

(B): The result of moving the work W by the length of the second arm 32 by holding the cylinder 39a against the cylinder stopper member 59. Next, for further movement, the connection between the slide member 37 and the suspension slider 38 is released, and the connection between the bracket 34 and the movable member 39b is released.

(C): The suspension slider 38 is connected to the moving member 39b, and the bracket 34 is connected to the cylinder 39a.
To join. Specifically, the cylinder 54 (see FIG. 5) is operated to release the lock pawl 46a from the hole 37a, and to release the slider stopper member 55 from the fitting pawl 52a.
The cylinder stopper member 56 is locked, the front side of the cylinder 39a is pressed, and the fitting claws 52a, 52b are locked to the lock claws 46a, 46b. Next, the work W is moved as indicated by an arrow c, with the cylinder 39a being on the “fixed side” and the mover 39b being on the “moving side”.

FIGS. 12A to 12D are explanatory diagrams (second half) of the operation of the multi-stage slide arm according to the present invention, wherein a white triangle indicates an unlocked or unlocked state, and a black triangle indicates a locked or unlocked state. Indicates that it is in the coupled state. (A): Work W has moved to below moving member 8. Next, the moving element 33 of the first rodless cylinder 33
a as the “fixed side” and the cylinder 33b as the moving side,
The work W is moved to the rear side as indicated by an arrow a. (B): Indicates that the work W has moved by the length of the first arm 31 as shown by the arrow b. For further movement, the connection between the suspension slider 38 and the moving element 39b is released, and the connection between the bracket 34 and the cylinder 39a is released.

(C): The suspension slider 38 is connected to the slide member 37, and the bracket 34 is
b. More specifically, the cylinder 57 (see FIG. 5) is operated, the cylinder stopper member 59 is opened, the rear side of the cylinder 39a is opened, and the fitting claws 52a, 52
b to release the lock claws 46a and 46b from the
The lock pawl 46b is locked to the lock pawl 7b, and the movable member stopper member 58 is locked to the fitting pawl 52b. Next, the work W is moved as indicated by an arrow c, with the movable element 39b being the “fixed side” and the cylinder 39a being the “movable side”. (D): Indicates that the work W is at the rearmost end. In order to move the work W at the rearmost end to the frontmost end, the reverse procedure in the above order may be executed.

In this embodiment, the base is a trolley.
The present invention is not limited to the trolley, and the base pedestal may be fixed or may be moved on a rail. Further, in this embodiment, the multi-stage arm is constituted by two stages of the first arm and the second arm, but may be constituted by three or more stages.

Further, in the first aspect, the clutch mechanism may be a mechanism for selecting the suspension slider as the slide member or the moving element of the second rodless cylinder, and
In addition to the pawl connection, a gear connection or a band connection may be used as long as the two members come and go, and the drive source for connection or disconnection may be various actuators such as an electromagnetic cylinder and a motor in addition to a leaf spring. The same applies to the mechanism for selecting the bracket as the moving element of the second rodless cylinder or the cylinder of the second rodless cylinder.

[0036]

According to the present invention, the following effects are exhibited by the above configuration. Claim 1 extends the cylinder of the first rodless cylinder fully to the front side or the rear side around the base member, further extends the second rodless cylinder fully to the first rodless cylinder, The workpiece can be laterally moved from the frontmost end to the rearmost end, or vice versa. That is, the workpiece can be moved laterally by a distance corresponding to twice the sum of the length of the first rodless cylinder and the length of the second rodless cylinder. And such a multistage slide arm can be comprised compactly.

In the second aspect, the clutch mechanism is constituted by the pair of mover stoppers, the pair of cylinder stopper members, and the pair of driving means, so that the clutch mechanism can be simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view of a transfer device according to the present invention.

FIG. 2 is a side view of the transfer device according to the present invention.

FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2;

FIG. 4 is an explanatory view of a multi-stage slide arm according to the present invention.

FIG. 5 is an enlarged view of a main part of a second arm shown in FIG.

FIG. 6 is an enlarged view of a main part of the first arm shown in FIG. 4 (b).

FIG. 7 is an explanatory view of a first operation of the transfer device according to the present invention.

FIG. 8 is an explanatory view of a second operation of the transfer device according to the present invention.

FIG. 9 is a diagram illustrating a third operation of the transfer device according to the present invention.

FIG. 10 is a diagram illustrating the operation of the balancer mechanism according to the present invention.

FIG. 11 is a diagram illustrating the operation of the multi-stage slide arm according to the present invention (first half).

FIG. 12 is a diagram illustrating the operation of the multi-stage slide arm according to the present invention (second half).

[Explanation of symbols]

8: base member (moving member), 30: multi-stage slide arm, 33: first rodless cylinder, 33a: moving element,
33b: cylinder, 34: bracket, 37: slide member, 38: suspension slider, 39: second rodless cylinder, 39a: cylinder, 39b: mover, 41: clutch mechanism, 54, 57 ... driving means (cylinder) , 5
5, 58: mover stopper member, 56, 59: cylinder stopper member, W: work.

Claims (2)

[Claims] A moving member (33a) of a first rodless cylinder (33) is attached to a base member (8).
The cylinder 33b of the rodless cylinder 33 is movably mounted.
Attach a bracket 34 of the same length as
The second rodless cylinder 39 is attached to the second rodless cylinder 39 so that the cylinder 39a or the moving element 39b of the second rodless cylinder 39 is selectively connected to the second rodless cylinder 39.
A slide member 37 having the same length as the cylinder 39a is attached in parallel with the cylinder 39a, and a suspension slider 38 for suspending the work W is slidably attached to the slide member 37, and the suspension slider 38 is attached to the slide member 37 or the When the slider 39b is selected, the bracket 34 is coupled to the cylinder 39a of the second rodless cylinder 39, and the slide member 37 is selected. A multi-stage slide arm including a clutch mechanism 41 that sometimes couples the bracket 34 to the slide member 37. The clutch mechanism 41 includes a movable member stopper member 55 for locking the movable member 39b of the second rodless cylinder 39, a cylinder stopper member 56 for locking the cylinder 39a of the second rodless cylinder 39, and And a driving means 54 for driving the stopper members 55 and 56 to the lock / unlock side at one end of the bracket 34, and the moving element 39b of the second rodless cylinder 39.
A stopper member 58 for locking the cylinder 39a of the second rodless cylinder 39, and a stopper member 58 for locking the cylinder 39a of the second rodless cylinder 39.
2. The multi-stage slide arm according to claim 1, further comprising a driving means 57 for driving the lock member to the lock / unlock side at the other end of the bracket 34.