JPH0593732U - Work clamp device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a work clamp device capable of reliably returning the clamp plate at the time of unclamping, even if the return spring is depressed. [Structure] A screw rod is rotatably held on a substrate fixed on a pallet, a clamp plate is movably fitted to the screw rod, and a spring is provided between the clamp plate and the substrate. Further, it is a work clamp device that clamps a work by pressing a clamp plate with a screw cylinder screwed to a screw rod, in which a flange-shaped skirt portion is provided on the screw cylinder, and a set screw is screwed into this skirt portion, and its tip end is attached. Engage with the clamp plate. During unclamping, the crank plate can be pulled up as the screw cylinder rises.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a work clamp device provided on a pallet of a machine tool.

[0002]

[Prior Art]

 Generally, when machining a work with a machine tool, the work is clamped on a pallet. However, if the work a has a special shape such as an automobile part as shown in FIG. There are things you can't do. In such a case, conventionally, for example, a clamp device c is tilted at a required angle with respect to the work reference plane b, and this clamp device c is screwed to the screw rod d by rotating the screw rod d. The workpiece a can be clamped on the pallet g by vertically moving the threaded cylinder e and pushing down the clamp plate f which is biased upward by the spring (not shown).

[0003]

[Problems to be solved by the device]

 In the conventional clamping device, when the work a is unclamped, the screw rod d is rotated in the opposite direction to move the screw cylinder e upward to release the pressing force against the clamp plate f and restore the restoring force of the spring. The clamp plate is pushed up to separate from the work a. However, if the restoring force of the spring is weakened and the pressing force of the screw cylinder e is released at the time of unclamping, the clamp plate f is not sufficiently returned and the function of the clamp device is deteriorated. It was

The present invention has been made in order to solve such a conventional problem, and provides a work clamp device capable of surely returning the clamp plate at the time of unclamping even if the return spring is depressed. The challenge is to provide.

[0005]

Means for Solving the Problem As a means for technically solving this problem, the present invention holds a screw rod on a substrate fixed on a pallet so as to be capable of forward and reverse rotation, and clamps the screw rod. The plate is movably fitted, and a spring is provided between the clamp plate and the substrate, and a screw cylinder is screwed onto the screw rod to abut the clamp plate. A work clamp device for clamping a work by the clamp plate by moving the screw cylinder up and down, wherein a flange-shaped skirt portion is provided on the screw cylinder, and a set screw is screwed into the skirt portion, and the tip end thereof is The main point is to engage with the clamp plate.

[0006]

[Work]

 When the screw rod is turned to raise the screw cylinder during unclamping, the set screw of this screw cylinder engages with the clamp plate, so that the clamp plate can be pulled up as the screw cylinder rises.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In FIG. 1, reference numeral 1 is a pallet of a machine tool, and a work W such as an automobile part having a special shape can be fixed by a clamp device 2.

The clamp device 2 is provided at an angle θ (about 15 ° to 20 °) with respect to the reference plane L of the work W, and the substrate 3 at the bottom thereof is fixed on the pallet 1.

Reference numeral 4 denotes a screw rod erected on the substrate 3, which is rotatably held in the normal and reverse directions, and a clamp plate 5 is fitted in the non-screw portion 4 a so as to be vertically movable along the screw rod 4. Further, a spring 6 is interposed between the clamp plate 5 and the substrate 3 to urge the clamp plate 5 upward.

Reference numeral 7 denotes a screw cylinder screwed into the screw portion 4b of the screw rod 4, and a flange-like skirt portion 7a is formed in the lower portion thereof, and a plurality of set screws 8 are laterally formed in the flange-like skirt portion 7a. From the outer peripheral groove 5a formed in the upper end portion of the clamp plate 5 so that they are engaged with each other.

The clamp device 2 according to the present invention is configured as described above, and when the screw rod 4 is rotated to lower the screw cylinder 7, the clamp plate 5 contracts the spring 6 and pushes down the work W. The end portion Wa can be pressed and fixed to the receiving portion 1a of the pallet 1. FIG. 1 shows the state of the clamp.

On the other hand, when unclamping, the screw rod 4 may be rotated in the opposite direction to raise the screw cylinder 7, that is, the set screw 8 of the screw cylinder 7 may be engaged with the outer peripheral groove 5 a of the clamp plate 5. Therefore, the clamp plate 5 is pulled up as the screw cylinder 7 rises.

Therefore, even if the return spring 6 of the clamp plate 5 is weakened due to sagging or the like, the clamp plate 5 can be reliably lifted, and the function of the clamp device can always be kept good. it can.

Although the clamp plate and the screw cylinder are engaged with each other through the set screw in the above-described embodiment, the engaging means is not limited to this, and for example, an engaging piece is provided on the screw cylinder, You may make it perform via this engaging piece.

[0015]

[Effect of the device]

 As described above, according to the present invention, in a clamping device for fixing a work on a pallet, a flanged skirt portion is provided on a screw cylinder that moves up and down by a screw rod, and a set screw is screwed into this skirt portion. Since the tip of the clamp plate is engaged with the clamp plate, the clamp plate can be forcibly pulled up as the screw cylinder rises during unclamping. However, the clamp plate can be surely returned, and the excellent function of the clamp device can be maintained at all times.

[Brief description of drawings]

FIG. 1 is a partially broken sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is an explanatory diagram of a conventional example.

[Explanation of symbols]

1 ... Pallet 1a ... Receiving part 2 ... Clamping device
3 ... substrate 4 ... screw rod 4a ... non-threaded portion 4b
… Screw part 5… Clamp plate 5a… Outer peripheral groove
6 ... Spring 7 ... Screw cylinder 7a ... Flange-like skirt portion 8 ... Set screw W ... Work Wa ... End portion

Claims (1)

[Scope of utility model registration request] 1. A screw rod is rotatably and rotatably held on a substrate fixed on a pallet, a clamp plate is movably fitted to the screw rod, and a spring is provided between the clamp plate and the substrate. Is provided, and a screw cylinder is screwed onto the screw rod to abut against the clamp plate, and the screw cylinder is moved up and down by rotation of the screw rod to clamp the work by the clamp plate. And a flange-shaped skirt portion is provided on the screw cylinder, a set screw is screwed into the skirt portion, and a tip end portion thereof is engaged with the clamp plate.