JPS6056838A - Clamping device with locking mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a clamping device for holding a workpiece WJ at a predetermined processing position, and particularly to a clamping device with a locking mechanism that allows the clamp to be fixedly removed while being held.

[Prior art]

As a conventional clamp device with a locking mechanism, for example, the first
There is something like the one shown in the figure. This shows what is attached to the processing device 1 via the pedestal 2. 3 is a clamp device main body, and 4 is a clamp mechanism comprising a reciprocating actuator 5 for clamping and a clamp member 6 driven by this actuator 5. 7 is this clamp member 6
The clamping mechanism is composed of a locking member 8 that slides across the locking member, and a reciprocating actuator 9 for driving the locking member. A wedge slope 6a is provided at one end of the clamp member 6,
Further, a wedge slope 8a is formed at the tip of the locking member 8 to engage with the wedge slope 6a. Furthermore, 1011m
An arm connects the rod 5a of the reciprocating actuator 5 for clamping and the clamp member 6, 11 is a sliding guide button, and W is a workpiece.

The conventional clamping device 3 with a locking mechanism is configured as described above, and in the unclamped state, the clamp part @6 is at the position shown by the chain line (A), and the locking member 8 is at the position shown by the chain line (B). At the time of clamping, first, the reciprocating actuator 5 advances the clamp member 6 from the position (a) to the position shown by the solid line. Next, the actuator 9 moves the locking member 8 from the position 16 indicated by the chain line (b). The position of the wedge slope 6a of the clamp member 6 is determined according to the height of the workpiece W, and the wedge slope 8a of the locking member 8, which has moved forward appropriately, is engaged with this wedge slope 6a, and the wedge slope 6a is fixed between the wedge slope 6a and the bush 11. The clamping member 6 is fixed by the acting wedge effect.

However, conventionally, the lock member 8 is
Since the locking mechanism γ is disposed crosswise with respect to the clamping mechanism 4, the locking mechanism γ protrudes from the clamping mechanism 4. Therefore, not only is it necessary to take up a large amount of installation space, but the processing of the workpiece W may be obstructed, and in some cases, it may be difficult to attach the workpiece to the processing device due to the structural limitations of the processing device 1 itself. There were various problems.

[Object of the Invention] This invention solves all of the above problems by arranging the locking mechanism so that it can slide coaxially with the clamping mechanism. It is an object of the present invention to provide a clamping device with a locking mechanism that allows smooth machining work and (3) simplifies the structure related to the actuator.

[Structure of the invention]

The present invention achieves all of the above objects by fixing a knockout member to the output shaft of one reciprocating actuator, and slidably disposing a clamp member in front of the knockout member via an elastic material. A locking member slidingly attached to and detachable from the clamp member along with the knockout member is provided in succession between both members, and the locking member moves slowly when moving forward, and the clamping member moves slowly when moving backward, The structure is such that a predetermined free movement interval is formed between the knockout member, the clamp member, and the lock member.

The present invention will be explained below with reference to embodiments shown in the drawings.

[Embodiment 1] Figures 2 to 5 are diagrams showing one embodiment of the present invention.

First, to explain the structure, Fig. 2 is a sectional view of the clamp in the released state, and 20 is a clamping device body with a locking mechanism attached to a processing device (not shown), into which a cylindrical bushing 21 is inserted. It is fixed with bolts 22.

Reference numeral 23 denotes a reciprocating hydraulic cylinder as an actuator which is coaxially fixed with the bushing 21 and fixed to the outside of the main body 20 with a bolt 24, and a cylinder rod 25 as an output shaft thereof moves back and forth within the bushing 21.

A knockout member 26 is screwed onto the tip of the output shaft 25, and a knockout ring 27f is fixed with a mounting bolt 28. The mounting bolt 28 is prevented from coming off by a set screw 28a. 29 is this knockout member 2
6 through an elastic material such as a compression coil spring 30, and is a member 2271 disposed at the front. This 2
271 member 29 has a tapered cone 31 fully formed at one end,
A clamp head 33 with a flang pad 32 attached to the other end is fixed with a bolt 34, and a t
A through hole 35 having a stepped portion 29a is bored. The mounting bolt 28 is inserted into the through hole 35, and a compression coil spring 30 is interposed between the bolt head 28a and the clamp head 33 in a somewhat compressed state. According to the expansion and contraction of the spring 30, the attachment bolt head 28a and the through-hole stepped portion 29a are engaged with and separated from each other. 3
6 is a locking member, which is connected to the above-mentioned knockout member 26 and 2.
271 and the member 29 so as to be slidable in the axial direction. That is, the lock member 36 has a hollow cylindrical shape, and has a wedge slope 37 formed on the inner surface of one end thereof, and is further connected to the wedge slope 37 by a stepped portion 36a? A retaining portion 38 is provided internally and is loosely fitted to the tip of the output shaft 25. A free movement interval h1e is provided between the shoulder portion 25a of the fitted output shaft 25 and the step portion 36a of the engagement recess 38 and the knockout ring 27 of the knockout member 26 can be engaged with each other in a detachable manner. be. When the knockout member 26 integrally connected to the output shaft 25 advances and retreats, the locking member 36 moves forward and backward in a free manner, and as a result, the wedge slope 37
, the clamp member 29 can be engaged with and detached from the Taber cone 31 near its forward limit.

In order to sequentially and smoothly engage the knockout member 26, clamp member 29, and lock member 36, 3.
Between the members 26, 29, 36, a required free movement distance is formed as follows. That is, in the unclamped state (retraction limit of the output shaft 25) shown in FIG. 37, a floating interval h2 is formed between the two. On the other hand, in the fully clamped state shown in FIG. 3 (advance limit of the output shaft 25),
There is a free movement interval h3 (h3=ht) between the knockout ring 27 of the knockout member 26 and the step portion 36a of the engagement recess 38 of the locking member 36.
The mounting bolt head 28a and the stepped portion 2 of the clamp member 29
9a, the floating interval h4 is h 3 (h 4 and h2
=0. Here, the idle interval h
1, the forward movement of the locking member 36 is caused by the output shaft 25 and the output shaft 227.
1 member 29, the idle interval h2 ensures lock release during forward and backward movement, the idle interval h3 causes the lock member 36 to start moving backwards later when the output shaft 25 starts moving backward, and the idle interval h4 is the 2271 member. Lock member 3 to start the retreat of 29
It is intended to operate more slowly than 6.

Next, the entire operation will be explained.

When the output shaft 25 of the actuator 23 is moved forward from the clamp released state shown in FIG. 2, the clamping operation is started.

First, the mounting bolt 28, which moves forward together with the output shaft 25, fully presses the clamp member 29 via the spring 30 and moves it forward. The output shaft 25 moves forward by the idle distance h1, and the shoulder portion 25a
When the locking member 36 hits, the locking member 36 also starts moving forward with a delay. At this time, an idle interval h3 is formed instead of the idle interval h1. Thereafter, the clamp member 29 and the lock member 36 move forward together with the knockout member 26 while maintaining the expanded free movement distance h2'r.

When the clamp pad 32 comes into contact with the workpiece W (FIG. 4), the forward movement of the 2271 member 29 is stopped.

This impact can be absorbed by the compression coil spring 30.

The output shaft 25 continues to move forward and compresses the spring 30, and at the same time as the idle interval h4 begins to expand, the idle interval h2 begins to decrease. Eventually, the wedge slope 37 of the locking member 36 comes into contact with the cheek cone 31 surface of the clamp member 29, and due to the wedge effect between the wedge slope 37 and the bush 21, 22
71. Lock the member 29 while holding it in a fixed state (FIG. 3).

After machining the workpiece W in this clamped state, the output shaft 25 of the actuator 23 is moved backward in order to completely release the lock. Then, the knockout member 26 moves with the free movement interval h
The mounting bolt head 2 rapidly retreats freely by the equivalent of 3 minutes.
8a collides with the step portion 36a of the locking member 360, the tenor 31 and the wedge slope 37 are separated and locked.
W can be easily released (Figure 5). At this time, the mounting bolt head 28a of the knockout member 26 and the clamp member 290
There is a gap h4 corresponding to h4-h3 between the stepped portion 29a and the stepped portion 29a.
' remains and the elastic force of the spring 30 is also acting, so the clamp member 29 remains at the club/club position. The output shaft 25 continues to move backward, and the distance h4'=
When it reaches O, the knockout member 26, clamp member 29, and lock member 36 move back together while maintaining the free movement distances h1 and h2, and reach the clamp released state shown in FIG. 2.

[Example 2] FIG. 6 shows another embodiment.

In this embodiment, an insertion hole 41 provided in a main body 40 of a clamping device with a locking mechanism, a knockout part moon 42, a clamp part cavity 43, and a locking member 44 that are slidably fitted into the insertion hole 41 each have a rectangular cross section, and Wedge-shaped lock member 44
A locking protrusion 44affi is formed at the tip of the clamp member 43, and the locking protrusion 4affi is formed on the clamp member 43 in series with the tapered surface 43a.
This embodiment differs from the first embodiment in that an engagement recess 43b is formed to engage with the engagement recess 43b.

FIG. 6 shows the locked state when clamping is completed. In this state, the relationship between the free space h11 formed between the knockout member 42 and the lock member 44 and the free space h12 formed between the 2271 member 43 and the lock member 44 is 111 (h12). That's how it is.

In addition, 45 is a cover plate that covers the main body 40, and the bolt 46
It is a solid layer.

This embodiment has the advantage of being simpler in structure, easier to process and manufacture, and cheaper.

〔Effect of the invention〕

As explained above, according to the present invention, the 2271 member is slidably arranged in front of the knockout member attached to the output shaft of one reciprocating actuator with the elastic material fully valved, and both members A locking member that slides between the knockout member and the clamping member and can be attached to and detached from the knockout member is provided between the three members so that the locking member moves slowly when moving forward, and the clamping member moves slowly when moving backward. Since the entire predetermined free movement interval is formed, there is no large protrusion from the clamp shaft, resulting in space savings and ease of machining of the workpiece.

[Brief explanation of drawings]

Fig. 1 is a sectional view of essential parts of a conventional clamp device with a locking mechanism, Figs. 2 to 5 show all embodiments according to the present invention, and Fig. 2 is a side sectional view of the clamp in the released state; 3 is a side sectional view of the clamping completed state, FIG. 4 is an explanatory diagram of the operation of the clamping process, FIG. 5 is an explanatory diagram of the operation of the unlocking process, and FIG. 6 is another embodiment according to the present invention. The figure (at is a side sectional view of the clamped state, BL is the same figure fa) (
b) −(bl sectional view. 23... Actuator 2
5・・・・・・・・・・・・・・・Output shaft 26.42・
...Knockout member 29.43...2
271 member 30・・・・・・・・・・・・Elastic material 36.44
...Song/lock member Fig. 2 Fig. 4 Fig. 5 [Top]

Claims (1)

[Claims] A knockout member is fixed to the output shaft of one reciprocating actuator, and a clamp member is slidably disposed in front of the knockout member via an elastic material, and is engaged with the clamp member along with the knockout member. A locking member that slides so as to be attachable and detachable is connected between both members, and
The knockout member and 227 are arranged so that the locking member moves slowly when moving forward, and the clamping member moves slowly when moving backward.
A clamping device with a locking mechanism, characterized in that a predetermined free movement interval is formed between the seventh member and the locking member.