JPH035388Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamping device for restraining a workpiece when processing the workpiece.

FIGS. 3 and 4 show conventional examples of this type of device, in which a pressing arm 1 capable of approximately circular arc movement by a hydraulic device (not shown) is swingably supported via a spherical joint 5 such as a spherical bearing. A plate 2 is provided, and three pressers 3 for restraining the workpiece 6 are fixed to the support plate 2, and these three pressers 3 each hold the workpiece 6.
The position is determined in advance with respect to the support plate 2 so that the presser arm 1 is actuated by a hydraulic device, and the presser 3 provided on the support plate 2 presses against the workpiece 6, and the drill The workpiece 6 is restrained by the hydraulic pressure of the hydraulic system when processing the workpiece 6 by means of a hydraulic system.

This device has the advantage of being small and simple in structure, but depending on the processing conditions of the processed product 6,
There is a desire to press and restrain four or more places on the workpiece 6, and for example, if four pressers 3 are provided on the support plate 2, even if the support plate 2 is swingable,
Any one of the four pressers will float away from the workpiece 6, making it impossible to press all four locations on the workpiece 6. If processing is performed in this state,
Vibrations are generated in the workpiece 6 during machining, causing problems such as damage to cutters such as drills and defective dimensions at the workpiece. Even if the number of pressers is increased to 5 or 6, the same result will occur as more than 3 pressers will be in a floating state. For this purpose, it is possible to use multiple hydraulic devices to operate each presser independently, but it is not preferable to use a large and complicated clamping device for small workpieces. I can not say.

The present invention has been devised in view of these points, and provides a clamping device that reliably presses and restrains four or more parts of a processed product without causing any inconvenience during processing, without increasing the size or complexity. The present invention will be described below based on embodiments shown in the accompanying drawings.

Figures 1 and 2 show an embodiment of the present invention.
In the drawing, four pressers 3 are provided on a support plate 2 provided on a presser arm 1 via a spherical joint 5 such as a spherical bearing, and the main body 7 of one presser 3a is attached to the support plate 2. A spring means 4 is provided between the presser element 3a and the support plate 2 and is slidably inserted into the formed hole 8, and this spring means 4 is made up of several plate springs stacked one on top of the other. Incidentally, reference numeral 10 in the figure is a locking portion that prevents the presser 3a from falling off the support plate 2. The other pressers 3 are fixed to the support plate 2 as in the conventional example. As described above, when the hydraulic system is activated and the pressing arm 1 descends and the pressing element 3a comes into contact with the workpiece 6, the spring means 4 provided between the pressing element 3a and the support plate 2 is activated. The compressed force acts on the support plate 2, causing it to swing, and the other three pressers 3 reliably abut against the workpiece 6, and the compressive force of the spring means 4 causes the slide. Since the flexible presser 3a is also brought into pressure contact with the workpiece 6, four locations on the workpiece 6 are reliably pressed and restrained.

In the above embodiment, there were four pressers, but in the case of five or more pressers, the number of pressers in excess of three is the same as the presser 3a. As a result, 4
Even if more than one presser is provided on the support plate, all the pressers will come into contact with the workpiece and reliably restrain it.

Since the present invention is as described above, the clamp device is small in size and has a simple structure, and each of the four or more pressers provided on the swingable support plate reliably presses and restrains the workpiece. This makes it possible to eliminate inconveniences during processing.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a clamping device showing an embodiment of the present invention, Fig. 2 is a bottom view of a clamping device showing an embodiment of the invention, Fig. 3 is a longitudinal sectional view of a clamping device showing a conventional example, and Fig. 4 is a longitudinal sectional view of a clamping device showing an embodiment of the invention. The figure is a bottom view of a conventional clamp device. Explanation of symbols: 1...pressing arm, 2...support plate,
3, 3a...presser, 4...spring means.

Claims (1)

[Scope of utility model registration request] A support plate 2 is provided on the press arm 1 via a spherical joint 5 so as to be able to swing freely, and four or more pressers 3 are provided on the support plate 2 to suppress the processed product. In a clamping device that restrains a workpiece by pressing against the support plate 2, more than three pressers 3 provided on the support plate 2 are slidable on the support plate 2, and the slidable pressers 3 A clamp device characterized in that a spring means 4 is provided between the support plate 2 and the support plate 3a.