JPS6023950B2 - machine vise - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the provision of a new means for machine vises, with which workpieces can always be placed at the correct squareness between fixed and movable jaws.

A machine tool that holds the workpiece between the mouthpieces of both jaws using a fixed jaw fixed on the main body and a movable jaw mounted on the main body so that it can move forward and backward in a straight line toward the fixed jaw. This method is well known and can be seen, for example, in Japanese Patent Publication No. 47-3396.

However, a common drawback of this type of machine vise is that when a workpiece is clamped and held between both jaws, the workpiece tilts toward the movable jaws. In the JIS standard, the perpendicularity (less than a right angle) between the cap and the sliding surface of the cap in both jaws is regulated to 0.03 squares or less for 100 willows, but the movement of this processed product is limited. The angle of inclination toward the chin varies greatly depending on whether the cough is held at the top of the chin or at the center.Furthermore, because the shape of the processed product varies, the cough is always kept at the correct right angle. It is extremely difficult to maintain this. For this reason, during actual work, skilled workers tighten the inserts for rough machining to sharpen the workpiece to a large or medium size, and conversely tighten the inserts for finishing machining to cut the workpiece to a small or medium size. The idea is to maintain the perpendicularity, but this relies on personal experience and technique, which lacks stability and reliability, and depending on the processed product, it may move if weakly clamped. In some cases, cutting may become impossible, and even if a high-precision machine/device is used, depending on how the jaws are tightened, it may be possible to produce defective or rejected products in terms of dimensional accuracy and perpendicularity. Currently, there are many problems that occur. In order to solve these problems in machines/devices, the present invention is designed to prevent deformation due to large bending stress acting on the main body and jaws when the workpiece is clamped and held between the two jaws as in the past. By eliminating this problem, coughing can be performed at the correct right angle at all times.The main feature of this device is that the moving member that drives the movable jaw, which is mounted on the main body so that it can move forward and backward, moves the movable jaw forward and backward. It is supported by the open low end of a C-shaped frame separately provided along the longitudinal direction of the main body so as to apply a tightening force at a height higher than the upper edge of the mouthpiece attached to the front surface, and the opening □ and other parts of the C-shaped frame are It consists of a point with a fixed jaw attached to the end.

The present invention will be described in detail below with reference to the illustrated embodiments.
Figure 2 is an overall view of the machine noise of the present invention, Figure 3 is a sectional view of the main part taken along line A-A in Figure 1, and Figure 4 shows a modified embodiment. A movable jaw 5 is installed on the main body 1 through a seal 8 and a guide 9 so as to be able to move forward and backward, and a mouthpiece 4b is attached to the front surface of the jaw 8.

In the embodiment shown in FIG. 1, a threaded rod 6 is used as a member for moving the movable jaw 5 back and forth, and 6a is its screw seat, but as in the embodiment shown in FIG. The reciprocating rods 7a of the cylinders 7 are connected to each other. In the case of the screw thread 6, the height of the tip should be greater than the height of the upper green of the cap 4b attached to the front surface of the movable jaw 5, and the tip should be attached as a spherical surface 10 to the movable jaw 5 through a retaining ring 11. and connect. In the present invention, the screw seat 6a of the screw holder 6, which is the advancing/retracting drive member, is fixed to the closed end 2a of the C-shaped frame 2, which is separately installed across the longitudinal center of the main body 1. A fixed jaw 3 is connected to the other open end 2b, and 4a is a base on the side of the jaw 3. Further, the other end of the screw shank 6 is provided with an angular shaft portion 6b for attaching a rotating handle. In the case of the cylinder 7 shown in FIG. 7, the cylinder 7 is supported by the open low end 2a of the C-shaped frame 2. According to the present invention, when a workpiece is inserted between the fixed jaw 3 and the movable jaw 5, and the movable jaw 5 is tightened and held by the advancement of the screw rod 6 or the rod 7a of the cylinder 7. , when a clamping force is applied to the workpiece by the advancing/retracting drive member, the rotating couple due to the force and the reaction force thereof does not turn clockwise in FIGS.
The upper part of the cap 4b does not open when it is crimped to the C-shaped frame 2, and even if bending stress is applied to the C-shaped frame 2, no bending stress is applied to the main body 1 side, and the C-shaped frame 2 is capable of absorbing bending stress. Since there is a deformation margin, no bending stress acts on the fixed jaw 3 or the movable jaw 5. Therefore, if the jaws 4a and 4b of both jaws 3 and 5 are properly formed and placed at right angles, the workpiece can be held at right angles, and no matter how strong the clamping force is, the main body 1. Since no bending force is applied to the jaws 3 and 5, coughing can always be performed at the correct perpendicular angle. There is no need to form the workpiece in such a way that it is fixed, and since the workpiece is held immovably by the strong clamping force and held at the correct right angle, it is possible to form the workpiece accurately and without any deviation in precision. Cutting can be easily achieved, and there is no problem with the conventional method where the perpendicularity is not correct, resulting in inaccurate cutting and large errors in dimensional accuracy. In addition, there is no need for the conventional method of dividing rough machining and finishing machining, adjusting the tightening strength to make them weaker or weaker, and adjusting the machining process.The finished product is always produced by excellent machining with high dimensional accuracy. This is an excellent product in that it does not require a high level of skill or skill on the part of the operator and can facilitate processing work.

[Brief explanation of the drawing]

1 is a cutaway side view of the lozenge portion of an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a cross-sectional view taken along the line A--A in FIG. 1, and FIG. 4 is a side view of a modified embodiment. 1...Main body, 2...C-shaped frame, 3
...Fixed jaw, 4a, 4b...Bag,
5...Movable jaw, 6...Neji shank, 7.
...Fluid pressure cylinder. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 A machine vise that grips a workpiece using a fixed jaw and a movable jaw that moves forward and backward toward the fixed jaw, in which a moving member that drives the movable jaw, which is mounted on the main body so as to be able to move forward and backward, is attached to the front side of the movable jaw. It is supported at one end of the opening of a C-shaped frame separately provided along the longitudinal direction of the main body so as to apply a tightening force at a height higher than the upper edge of the cap attached to the body, and is fixed to the other end of the opening of the C-shaped frame. A machine vise characterized by the addition of jaws.