JPH0448902Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a work clamp device for fixing a work to be machined by a drilling machine.

[Conventional technology]

Conventionally, in drilling machines that have multiple drill units and can machine workpieces simultaneously or continuously using these drill units, the workpiece to be machined is fixed in a predetermined position by a workpiece clamp device. .

[Problem that the invention attempts to solve]

Conventional work clamp devices have fixed the work using clamp claws driven by hydraulic or pneumatic actuators, or fixed the work using clamp claws that can be repositioned.

However, with the former type of actuator that drives the clamp claw, in order to widen the range of workpieces that can be clamped, it is necessary to use an actuator with a large stroke, and it cannot be used if there is a restriction in the height direction, and the pressure source Because the system requires pressure piping, etc., the configuration is complicated and expensive.

In addition, the latter type of clamp device having repositionable clamp claws has problems such as complicated operation because it is necessary to attach and detach the clamp claws and change the position each time the height of the workpiece changes.

This invention was made for the purpose of improving the above-mentioned problems.

[Means and actions for solving problems]

A locking rod that can be moved up and down by a clamp cylinder is provided at a fixed position of the workpiece to be machined by the drilling machine, and a movable clamp claw that can be locked at any position is provided on the locking rod, and the movable clamp claw A work clamping device for a drilling machine that is capable of clamping workpieces of various sizes with a clamp cylinder with a small stroke by providing a fixed clamp claw that fixes the work between the movable clamp claw and a movable clamp claw at a position facing the movable clamp claw.

[Embodiment] An embodiment of this invention will be described in detail with reference to the drawings.

In the figure, reference numeral 1 denotes the main body of this device installed in an automatic drilling machine (not shown), in which a fixing claw 3 and a clamp cylinder 4 are attached to a bracket 2. The clamp cylinder 4 is fixed to the bracket 2 with the piston rod 4a facing upward, and a locking rod 5 is connected to the tip of the piston rod 4a via a joint 6.
The bottom end of is connected.

The upper end side of the locking rod 5 is supported by a guide tube 7a provided on the upper part of the bracket 7 so as to be movable up and down, and from the inner circumference of the guide tube 7a, the upper end side of the locking rod 5 is formed on the upper outer circumference of the locking rod 5. A locking pin 8 whose tip fits into the groove 5a is protruded and prevents the locking rod 5 from rotating.

Further, on the outer circumferential surface of the locking rod 5 on the side opposite to the concave groove 5a, a large number of locking teeth 5b in the form of a rack are formed in the axial direction. The locking portion 11a of the locking pawl 11 can be locked. One end of the movable clamp claw 10 is fitted into the outer circumference of the locking rod 5,
It is movable up and down along the locking rod 5, and a positioning mechanism 12 is provided at the end.
The positioning mechanism 12 includes a ball 12a that is selectively fitted into a plurality of positioning grooves, for example, three positioning grooves 5c formed on the outer periphery of the locking rod 5;
Compression spring 1 that urges 2a toward the positioning groove 5c
2b, and a movable clamp claw 10
can be positioned at three locations: the solid line position and the imaginary line position in FIG.

On the other hand, the locking pawl 11 housed in the movable clamp pawl 10 has a locking portion 11a that is shaped to engage with the locking tooth 5b of the locking rod 5 when an external force is applied to the movable clamp pawl 10 from below. A recess 11b is formed at the other end, and one end of the compression spring 13 is accommodated in the recess 11b. The other end of the compression spring 13 is in contact with a spring seat 14 provided at the tip of the movable clamp claw 10, and the compression spring 13 causes the locking claw 11 to
is urged toward the locking rod 5 side.

Next, the operation will be described. A workpiece 15 to be processed by the automatic drilling machine is carried in from a direction perpendicular to the plane of the paper by a carrying means (not shown) and is stopped in front of the main body 1.

If the workpiece 15 to be clamped is large as shown by the solid line in FIG. 1, the movable clamp claw 10 is raised along the locking rod 5 according to the workpiece 15. To move the movable clamp claw 10 upward, first
When the locking rod 5 is rotated from the position shown by the solid line to the position shown by the imaginary line to the right or left, the locking portion 11a of the locking claw 11 that is engaged with the locking tooth 5b of the locking rod 5 is rotated to the right or left. Because it rides on the outer periphery and comes off from the locking teeth 5b,
The movable clamp claw 10 can be freely moved up and down along the locking rod 5.

Once the movable clamp claw 10 has been raised to the solid line position shown in Fig. 1, it is rotated again to the original position (the solid line position in Fig. 2) to engage the locking portion 11a with the locking teeth 5b, and this state is maintained. By pulling the engaging rod 5 by the clamp cylinder 4 and lowering the movable clamp claw 10 to the position indicated by the imaginary line in FIG. be able to clamp.

On the other hand, if the workpiece 15 is small, the first
It is possible to clamp from a large workpiece 15 shown by the solid line in the figure to a small workpiece shown by the imaginary line.

[Effect of idea]

As described in detail above, this device is equipped with a movable clamp pawl that can move up and down and rotate freely on a locking rod that can be moved up and down by a clamp cylinder. Since a locking claw is provided that is locked to the formed locking tooth and is released when the movable clamp claw is moved downward or rotated, various sizes of workpieces to be clamped can be used. Even if the size of the workpiece changes, the workpiece can be clamped by simply moving the movable clamp claw according to the size of the workpiece and then lowering the locking rod using the clamp cylinder. Compared to the method in which a locking rod equipped with a claw is moved up and down, this can be done in a shorter time, improving productivity.

In addition, the movable clamp claw can be roughly positioned to match the workpiece, then pushed down until it contacts the workpiece, and then the workpiece can be clamped by the clamp cylinder, so the clamp cylinder only needs to be able to move the movable clamp claw slightly downward. This makes it possible to use a clamp cylinder with a small stroke, making it possible to reduce the size and weight of the entire device, as well as to reduce its cost.

Moreover, by using a clamp cylinder with a small stroke, the rigidity of the piston rod increases, so a larger clamping force can be obtained with a smaller cylinder, and even if the size of the workpiece changes, the clamp claws and locking can be adjusted according to the workpiece. Work efficiency is further improved as there is no need to replace the rod.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, with FIG. 1 being a longitudinal sectional view and FIG. 2 being a plan view. 4 is a clamp cylinder, 3 is a fixed clamp claw,
5 is a locking rod, 10 is a movable clamp claw, and 15 is a workpiece.

Claims (1)

[Scope of utility model registration request] A locking rod 5 that is movable up and down by a clamp cylinder 4 is provided at a fixed position of the workpiece 15 to be machined by the drilling machine, and the locking rod 5 is provided with a movable clamp claw 10 that is movable up and down and can be rotated. The movable clamp claw 10 is provided with the locking rod 5.
When the movable clamp pawl 10 is moved downward, it is engaged with the locking teeth 5b formed on the locking rod 5, and when the movable clamp claw 10 is moved downward and rotated, it is engaged with the locking teeth 5b of the locking rod 5. In addition to providing a locking claw 11 that is released from engagement,
A drilling machine provided with a fixed clamp claw 3 for fixing the workpiece 15 between the movable clamp claw 10 and the movable clamp claw 10, which is in a locked state with the locking teeth 5b of the locking rod 5. work clamp device.