JPH0725000B2 - Rotating plate holding 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 rotary plate holding device, and more specifically, it precisely processes a workpiece mounted on a rotatable shaft by a rotary cutting blade or the like on another rotary shaft. The present invention relates to devices used for machine tools and the like.

[0002]

2. Description of the Related Art A conventional holding device of this kind is shown in FIGS. In FIG. 3, reference numeral 1 is a rotary plate which is rotated by a rotary shaft 1a, and 2 is a pair of left and right friction plates, which are both side surfaces of the rotary plate 1.
It is arranged opposite to 1b and 1c. The rear mounting portions 4 and 4 of the friction plates 2 and 2 are rotatably connected to the upper ends 3a and 3a of the arms 3 and 3, respectively. Each of the arms 3 and 3 has a central portion pivotally supported by a bearing portion 5a of a main body 5 and has lower end portions 3b connected to each other via a cylinder device 6 for opening and closing the arms.

In this conventional example, the cylinder device 6 drives the upper ends 3a, 3a of the arms 3, 3 in the closing direction,
By pressing the friction plates 2 and 2 against the side surfaces 1b and 1c of the rotary plate 1, the rotary plate 1 is held.

[0004]

By the way, in the above-mentioned prior art, in order to position the workpiece on the same axis as the rotary plate 1 so as not to move, the rotary plate 1 should be kept in a backlash-free state. Must be held securely. Therefore, it is necessary to prevent the rotating plate 1 from moving in the positive or negative direction indicated by the arrow A in FIG. 4 in a state where the friction plates 2 and 2 are pressed against both side surfaces 1b and 1c of the rotating plate 1.

On the other hand, when the arm 3 is rotatably attached to the bearing 5a, it is necessary to provide a radial gap G and a thrust gap G'between the arm 3 and the bearing 5a. In this case, use the friction plates 2 and 2 on both sides of the rotating plate 1.
When pressed against 1b and 1c, a turning force due to friction acts on the upper end portions 3a and 3a of the arms 3 and 3 in the rotating direction of the rotating plate 1. Therefore, movement (backlash) occurs in the arm 3 and the rotating plate 1 swings, so that the workpiece cannot be accurately positioned.

Therefore, even if the clearances G and G'with the arm 3 are set to the minimum by precisely processing the bearing portion 5a, the movement of the friction plate 2 in the rotating direction of the rotating plate 1 is prevented. Although it is minute, it occurs. Even such a minute movement is not allowed in the field of the device for holding the rotating plate 1.

Moreover, even if the above-mentioned gaps G and G ′ are processed to a minimum precision, the condition that the arm 3 must be able to rotate and the gap in the allowable processing accuracy are necessary, which causes a problem in productivity. Not only this, the bearing 5a may become immobile or backlash may increase due to heat expansion during normal operation, expansion and contraction due to thermal changes in the ambient temperature, changes in dust conditions, and progress of wear.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is possible to hold the rotating plate in a state without backlash, and moreover, to improve the productivity. It is to provide a device.

[0009]

In order to solve the above-mentioned problems, the present invention provides a predetermined interval on both side surfaces of a rotating plate.
A pair of friction plates placed facing each other , with the same outside
The leaf springs are fixed to the friction plate mounting portions of a pair of leaf springs that are arranged opposite to each other on both sides of the rotary plate, and the extended ends of each leaf spring are supported by the main body.
Fixed as irrefutable the sandwiching member, the friction plate mounting portion of the respective plate springs drive means to deflect the movable back and forth toward the rotating plate
It is provided .

[0010]

[Operation] If the drive means does not push the friction plate mounting portion of the leaf spring
The friction plate attached to the leaf spring is
It Therefore, the rotating plate rotates regardless of the body. Now
The friction mounting portion is pressed toward the rotating plate by the driving means.
And press the friction plate against the rotating plate, the rotating plate and the friction plate come together.
It becomes a body and the body is also integrated with the rotating plate. At this time, the leaf spring
However, the leaf spring is fixed to the support of the main unit so that it will not move.
Therefore , the leaf spring does not bend in the rotation direction of the rotating plate . Therefore, it is possible to prevent the friction plate from moving toward the rotating plate when the friction plate is pressed against both side surfaces of the rotating plate, and it is possible to reliably hold the rotating plate without backlash.

Further, since the friction plate mounting portion of the plate spring is bent so as to press the friction plate toward the rotating plate side as described above, the parts constituting the driving means of the plate spring, for example, the arm and the bearing portion. It is not necessary to precisely set the gap or to perform precision machining of the bearing portion, which improves productivity.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings.

In FIG. 1, a pair of left and right friction plates 20 and 20 are arranged opposite to each other on both side surfaces of the rotary plate 1 with a predetermined gap G ₁ between them. , Leaf spring 10, 10
It is attached to the friction plate mounting portions 10b, 10b.

The leaf springs 10, 10 are arranged in parallel with the rotary plate 1, and the extended ends 10 of the friction plate mounting portions 10b, 10b thereof are arranged.
The a and 10a are fastened and fixed to the support portion 5b of the main body 5 with four bolts 11. The friction plate mounting portions 10b, 10b can be bent in directions B approaching or moving away from the rotating plate 1, respectively, but can be bent in the same direction as the rotating direction A of the rotating plate 1 in FIG. It has unrivaled rigidity. As a result, even when the leaf springs 10 and 10 are bent and the friction plates 20 and 20 are pressed against the rotating plate 1 and the turning force due to the friction in the forward or reverse direction A acts on the friction plates 20, It is possible to prevent minute movements from occurring in 20.

Further, as shown in FIG. 1, the friction plate mounting portions 10b, 10b
A pair of left and right pressing members 30 and 30 are arranged to face each other on the back surface of the pair with a constant gap G ₂ . The pressing member 3
0 and 30 are rotatably supported on the upper ends 3a and 3a of the arms 3 and 3, respectively, and the center of each arm 3 is rotatably supported by the bearing portion 5a of the main body 5 as in the conventional case. The lower end 3b is pivotally supported and is connected to the cylinder device 6 for opening and closing the arm.

Next, the operation of the above configuration will be described.

First, when the rotary plate 1 is held, the upper end portions 3a, 3a of the arms 3, 3 are driven by the cylinder device 6 in the closing direction. As a result, the pressing members 30, 30 press the friction plate mounting portions 10b, 10b to bend them toward the rotating plate 1 side, so that the friction plates 20, 20 are pressed against both side faces 1b, 1c of the rotating plate 1. Then, the rotating plate 1 is held. In this state, the friction plate 20,
Rotational force due to friction acts on the rotating plate 1 in the rotating direction A (FIG. 2) of the rotating plate 1, but the leaf springs 10 and 10 themselves do not rotate.
The friction plates 20 and 20 do not move in the rotation direction of the rotation plate 1 because they do not bend in the rotation direction A.

After that, when the holding of the rotary plate 1 is released, the cylinder device 6 is used to move the upper end portions 3a of the arms 3 and 3.
Drive 3a in the opening direction. Thereby, each pressing member 30,3
Since 0 is retracted and the bent leaf springs 10 and 10 are elastically restored, the friction plates 20 and 20 are separated from the rotating plate 1 and the rotating plate 1 can be rotated.

In the above structure, the friction plate 20 is attached to the friction plate attachment portion 10b of the leaf spring 10 and the friction plate attachment portion 10b is bent toward the rotating plate 1.
Even though 20 is bent toward the turning plate 1 side B, the turning direction A of the turning plate 1 is
Does not bend. Therefore, the friction plate 20 is attached to both side surfaces 1 of the rotary plate 1.
The friction plate 20 can be prevented from moving in the rotation direction A of the rotating plate 1 when pressed against b and 1c, and the rotating plate 1 can be reliably held without backlash. As a result, the workpiece on the same axis as the rotating plate 1 can be accurately positioned so as not to move, and the machining accuracy is improved.

Further, since the leaf spring 10 is bent to press the friction plate 20 against the rotary plate 1, the gaps G, G'between the arm 3 and the bearing portion 5b can be precisely adjusted as described in the prior art. It is not necessary to set or perform precision machining of the bearing portion 5b.
That is, even if a slight movement (backlash) occurs in the arm 3 due to the gaps G, G ′, such movement does not affect the leaf springs 10, 10.
As a result, there is no possibility that the rotating plate 1 will swing. Therefore,
Since precision processing is not required, not only cost, but also production can be improved.

[0021]

As described above, according to the present invention,
The friction plate mounting portion of the leaf spring is bent so as to move back and forth toward the rotating plate, and the extension portion of the leaf spring is supported by the main body.
Since the friction plate is fixed so as not to move, it is possible to prevent the friction plate from moving in the rotating direction of the rotating plate when the friction plate is pressed against both side surfaces of the rotating plate. Therefore, the rotating plate can be securely held without backlash.

Further, since the plate spring is bent so as to press the friction plate toward the rotary plate as described above, the parts constituting the driving means of the plate spring, for example, the bearing portion of the arm is subjected to precision machining. There is no need to do anything. Therefore, the work is improved and the productivity is improved.

[Brief description of drawings]

FIG. 1 is a front view showing a rotating plate holding device according to an embodiment of the present invention.

FIG. 2 is a side view of the same holding device.

FIG. 3 is a front view showing a conventional rotary plate holding device.

FIG. 4 is a conventional side view of the same.

[Explanation of symbols]

1 Rotating plate 1b, 1c Side surface of rotating plate 5 Main body 5a Support member 6 Driving means 10 Leaf spring 10a Extended end 10b Friction plate mounting portion 20 Friction plate A Rotation direction G ₁ Predetermined interval

Claims (1)

[Claims] 1. A rotating plate holding device for holding a rotating plate by pressing a friction plate against a side surface of the rotating plate, wherein a pair of opposing side faces of the rotating plate are arranged at a predetermined interval. Friction plate
On the outside, facing both sides of the rotating plate
Fix it to the friction mounting parts of the pair of leaf springs that are
Secure the extended end of the spring to the support of the main unit so that it does not move,
Holding device rotating plate, wherein a friction plate mounting portion of the respective plate springs provided with drive means for deflecting the movable back and forth toward the rotating plate.