JPS603938B2 - Work clamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamping device used for positionally fixing a workpiece.

For example, when cutting a workpiece using a girder milling machine or the like, it is necessary to position and fix the workpiece.

The actuating source for fixing this forgery has traditionally been an actuating tube,
Vacuums, electromagnets, etc. are used, but the object of the present invention is to provide a clamping device that can simultaneously position and fix a workpiece with a balanced force using one operating cylinder. be. To explain the embodiment shown below, FIG. 1 shows that when a long workpiece 2 is to be machined by a girder milling machine 1, the workpiece 2 is clamped onto a workpiece rail 3 using two clamping devices A, A of the present invention. Although it is a perspective view showing a state in which the clamp devices A are used, the number of clamp devices A to be used, installation positions, etc. may be determined as appropriate according to the shape of the workpiece.

To explain the structure of the clamp device A, the work rail stand 4
2 adjacent to one side of the work rail 3 in the longitudinal direction
Two brackets 5 are fixed, and levers 6 and 7 are supported by pins 8 on each bracket 5, respectively.

The levers 6, 7 have horizontal portions 6a, 7a and vertical portions 6b, 7b extending upward and in a direction perpendicular to the longitudinal direction from the pivot point, respectively, and swing in a plane perpendicular to the longitudinal direction. do. The longitudinal protrusions 9, 9 are provided on the lower surfaces of the tips of the horizontal portions 6a, 7a, and the protrusions 11 are formed on the upper surface of the balance member 10, and are perpendicular to the protrusions 9.
1 is formed with a recess 12, and the protrusion 9 of the lever 6 is connected to the protrusion 1.
1 also allows the protrusion 9 of the lever 7 to be supported by the bottom of the recess 12. The protrusions 9 and 11 are in contact with each other with their semi-cylindrical surfaces, and the recess 12 receives the semi-cylindrical protrusion 9 to prevent the balance member 10 from falling. The center part of the lower surface of the balance member 10 is supported in spherical contact with the tip of the ram 14 of the operating cylinder 13 attached to the milling machine 1. Vertical portion 6a of lever 6
A horizontal clamp member 16 is connected by a pin 15 to the tip of the lateral clamp member 16 so as to be able to swing up and down and change its position forward and backward.
a is supported on the upper surface of the work rail 3 so that the horizontal clamp member 16 is substantially horizontal.

The upper end of the vertical portion 7b of the other lever 7 is bent, and the vertical clamp member 17 is fixed thereon with a bolt 18 so as to be adjustable in its longitudinal position. A notch 19 is provided on the lower surface of the tip of the vertical clamp member 17 to engage with the clamp portion 2a of the workpiece 2. Next, the operation of the present invention will be explained.

When the actuating cylinder 13 is shortened, the lever 10 and the horizontal parts 6a, 7a of the lever are lowered by their own weight, the clamp member 16 is retracted to the non-operating position (Fig. 2a), and the vertical clamp member 16 is The member 17 is in an inclined state with the notch 19 raised (FIG. 2b). In this state, there is a gap between the tip of each clamp member 16, 17 and the positioning protrusion 20 of the work rail 3 so that the longest workpiece 2 can be easily moved in and out. 3. War calendar on top. Next, when the actuating cylinder 13 is extended, the balance member 10 swings the levers 6 and 7 at the same time, and the horizontal clamp member 16 moves forward in a substantially horizontal position to position the workpiece 2 on the protrusion 20.
At the same time, the notch 19 of the vertical clamp member 17 engages with the corner 2a of the workpiece 2 to be clamped, and the corner 2a is clamped onto the workpiece rail 3.
Push down to fix the workpiece (Fig. 2d). In this case, after the workpiece is fixed, the actuation force of the actuating cylinder 13 is applied to the levers 6 and 7 via the balance member 10 at a constant rate, but until the workpiece is fixed,
Even if either of the pressing of the workpiece by 6 and the engagement of the notch 19 of the vertical clamp member 17 is completed first, sufficient operating force will not be transmitted to the workpiece 2 until the other is completed. 16 and 17 do not interfere with the smooth operation of each other. Further, the protrusions 9 of each lever 6, 7 rise in a circular pattern, but at the position where sufficient operating force is applied to both clamp members 16, 17, the pressure receiving point of the protrusions 9, 9 is approximately at the center plane of the ram 14. If the lever is located within the center, the actuating force of the actuating barrel 14 can be transmitted to the lever without causing the balance member to fall over. The present invention has the above-mentioned configuration, and can simultaneously perform positioning and fixing of the workpiece using one operating cylinder. Even if there is a difference in the bridge angles of the levers, the balance member only tilts, and the operating force of the actuating cylinder is transmitted to each clamp member at a predetermined ratio, which has the effect of reliably clamping and fixing the workpiece, and the structure is improved. It also has the advantage of being easy to operate.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an inkstone drawing as a whole;
FIGS. 2a and 2b are elevational views showing the horizontal clamp member and the vertical clamping member in the non-operating state, respectively, and FIGS. 2c and 2d are elevational views showing the same in the operating state, respectively. 3... Work rail, 5... Fixed bracket, 6, 7...
...Lever, 6a, 7a...Horizontal part, 10
..... Balance member, 13 ..... Operating tube, 16
...Horizontal clamp member, 17...Vertical clamp member. Figure 1 Figure 2 Figure 2

Claims (1)

[Claims] 1. Two levers each having a horizontal portion extending in a direction substantially perpendicular to the protrusion are pivoted vertically by a fixed bracket provided on the other side of the work rail having a workpiece positioning protrusion on one side. An actuating cylinder is provided for swinging both levers by pressurizing a central part of a balance member that supports the tips of both horizontal parts at both ends, and one lever is provided with an actuating cylinder that swings in a substantially horizontal direction due to the swinging. A workpiece clamping device, characterized in that a horizontal clamping member for positioning and pressing the workpiece against the protrusion is pivotally mounted, and a vertical clamping member for pressing the workpiece down onto the workpiece rail by the swinging movement is attached to the other lever.