JPH0493181A - Vice - Google Patents

Abstract

PURPOSE:To perform the holding of a work correctly with good efficiency, by arranging sliding jaws having the respective left female screws in opposition freely movably forwards and backwards to the front and back parts of a fixed jaw fitted to the center of a vice main body. CONSTITUTION:On rotation of an operation shaft 7, a fastening force is generated via a work between the fixed jaw 2 and each sliding jaws 3, 4 with the front and back sliding jaws 3, 4 being approached or separated simultaneously individually for the center fixed jaw 2. At this time, each sliding jaws 3, 4 are simultaneously moved toward the work placed on both stages, because of the operation shaft 7 being floated in the axial direction together with the sliding jaws 3, 4 even in case of there being a dimensional error on the work, and the work is held with the front and mach uniform load, simultaneously with the fastening force being generated with the both sliding jaws 3, 4 coming into pressure contact with the work.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vise capable of simultaneously holding a large number of workpieces in one operation, and more specifically to a vise that is arranged in front and behind an intermediate fixed jaw. This invention relates to an opposing load distribution type vise in which sliding jaws are moved forward and backward at the same time by a single operation shaft.

[Prior art]

Conventionally, when holding a large number of workpieces on one machine tool such as a milling machine or a drilling machine using vises, usually multiple 1-stage vises were installed in parallel.
Method of tightening each vise individually (8)
Alternatively, method (B) is used in which a large number of workpieces are held in parallel using a long stage type vise.

In addition, as a special vise, a type of vise in which sliding jaws placed in front and behind the central fixed jaw are moved forward and backward using an operating shaft provided on each jaw (Utility Model Publication No. 2-43
1.67), or a type in which a pair of double-sided tightening vises (sliding jaws) are moved forward and backward at the same time with a screw shaft for the opening/closing member (No. Utility Model Application Publication No. 6174275) is known.

[Problem that the invention seeks to solve]

By the way, when using the conventional method (c), it is necessary to individually operate a large number of vises, which makes the operation complicated and takes a lot of effort. In addition, in method (B), the larger the number of pieces held, the more the dimensional errors of the workpiece will accumulate, and the effect of the lack of rigidity of the vise will also be added, causing the workpiece to float and become flattened, resulting in an overall problem. Holding accuracy and ability will decrease. The accumulation of dimensional errors makes it difficult to perform machining within the specified machining accuracy, and in order to satisfy this requirement, the machining accuracy of the pre-process of the workpiece must be made more stringent than necessary. In addition, as the number of pieces held increases, the tightening ability of the workpieces held near the center in the direction perpendicular to the direction decreases, resulting in the workpieces being unable to withstand the cutting force and causing the workpieces to jump out of the line during machining. It has the disadvantages of

Next, in the vise of Utility Model Application No. 2-43167, only one fixed jaw is sufficient, and the sliding jaws on the front and rear that sandwich the jaw can be moved forward and backward by the respective operation shafts provided on the respective sliding jaws. Not only does this not save the labor of operation, but it also makes it impossible to evenly distribute the tightening load between both holding parts. Further
The model No. 74275 does not have fixed jaws, and since the opposing jaws move toward and away from each other at relatively the same time, it has the advantage of being able to hold the workpiece at a high speed. This method has the same drawbacks as method (B), such as when holding a large number of workpieces, the workpieces may float due to insufficient rigidity of the vise.

The present invention addresses this situation by simultaneously holding the workpiece at the front and back positions of the fixed jaw with equal force by rotating a single operation shaft, and also reduces the accumulation of dimensional errors in the workpiece. To accurately and efficiently perform holding work with the least number of steps and labor.

[Failure to solve the problem]

The vise of the present invention has sliding rods with left-hand female threads and right-hand female threads facing each other at the front and rear of a fixed jaw attached to the central part of the vise body so as to be able to move forward and backward. The present invention is characterized in that a single operating shaft having male threads on the right side is screwed together so that the operating shaft can move axially with respect to the base body together with the sliding jaws.

[For production]

When the operating shaft of the vise of the present invention is rotated, the front and rear sliding jaws approach or move away from the central fixed jaw at the same time, causing tightening via the workpiece between the fixed jaw and each sliding jaw. Power is generated. At this time, even if there is a dimensional error in the workpiece, the operating shaft moves axially with the sliding jaws, so each sliding jaw moves simultaneously toward the workpieces placed on both stages, and both sliding jaws By pressing against the workpiece, a clamping force is generated, and at the same time, the workpiece is held with an even load on the front and back. That is, each workpiece on the front and rear stages with the fixed jaw as a reference is 2
4 pieces in total, and the dimensional error of the workpiece is 0.0
5, when using a normal vise, if the four workpieces mentioned above are placed in parallel, the cumulative error will be 0°2 (0.4 if there are 8 workpieces)
However, according to the present invention, two workpieces are placed on each of the front and rear stages, so the angle is 0°1 for the four workpieces (0.2 for eight). Therefore, the cumulative error can be reduced. In addition, since the workpiece is tightened by the front and rear sliding jaws with a fixed jaw in between, the vise of the present invention does not cause loss of tightening force due to the thrust load of the operating shaft, and therefore the vise body The tightening reaction force applied to the grip is also much smaller than that of conventional products, and the holding accuracy can be improved.

〔Example〕

Hereinafter, the present invention will be explained with reference to the embodiments shown in the drawings.

In Figures 1 to 4, a fixed jaw 2 is fixedly installed in the central part of the vise body 1, and a guide groove 1a provided in the vise body 1 is provided at the front and rear of the jaw. Sliding holes (master holes) 3 and 4 are provided so that they can be moved forward and backward by bending at 2, and have a left female thread 3a and a right female thread 4a, respectively, on the same axis. 5 and 6 are fitted and placed on circular bosses 3b and 4b protruding from the horizontal upper surface of the central portion of each of the sliding jaws 3 and 4 so as to be rotatable about the axis of the boss, and It is a balanced jaw whose rotational center is held by set screws 5' and 6', and the jaw has a horizontally concave shape when viewed from above, and is provided with pressing portions 6a and 6b on the left and right sides of one side. 7 is the above sliding jaw 3
, 4, which can be screwed into the left and right female screws 3a and 4a provided in the sliding jaws 3 and 4. By rotating the shaft with the retaining portion 7' at one end while being screwed into each female thread, each of the sliding rods 3, 4 can be moved forward and backward toward the fixed jaw 2 as described above. Note that the operating shaft 7 is connected to the vise body 1.
On the other hand, the screws 7a and 7b are fitted only to the female threads 3a and 4a of the sliding jaws 3 and 4, respectively, and therefore the shaft 7 is connected only when one of the sliding jaws is attached to the fixed jaw 2. It is free to move in the axial direction together with the sliding jaw until it comes into contact.

8 is the operating shaft 7 and the sliding jaws 3 and 4 as described above.
A free movement regulating rod for regulating the free movement in the axial direction of the operating shaft 7 within an appropriate size range, the regulating rod is disposed opposite to both axial end surfaces of the operating shaft 7 with a slight distance. Although they may be fixed to both ends of the vise body 1, the first and second
As shown in the figure, the regulating rod 8 is provided with a required gap between the formed end 7'' of the female thread 4a of the operating shaft 7 and the auxiliary protrusion 9 on the extension shaft.
One end surface 1b of the vise body 1 is in a state where
It may also be fixed to. In the figure, A.

B shows two workpieces placed one on top of the other on the front and rear sides of the fixed jaw 2.

In the above configuration, the workpieces A and B to be held in a rotating manner are placed in two layers between the fixed jaws 2 and the sliding jaws 3 and 4, respectively, and then the operating shaft 7 is By rotating, each sliding jaw 3 and 4 is moved in the direction of tightening. At this time, if there is a difference in the thickness of the workpieces A and B, and one of them is thicker, the sliding jaw 3 first contacts the workpiece A and stops, and at the same time the operating shaft (1.2
(in the figure), and then the other sliding jaw 4 moves in the tightening direction and comes into contact with the workpiece B.

At this point, the axial movement of the operating shaft 7 stops, and a force is generated when the equal load is applied to the workpieces A and B at the same time, so the specified tightening continues by applying a rotational force to the operating shaft in accordance with the force. By adding it, tightening is completed.

In addition, by making the clearance l in which the operating shaft 7 can freely move, which is defined by the free-foot regulating rod 8, slightly larger than the dimensional difference between the workpieces A and B, the movement of the sliding jaw 3.4 can be improved. Furthermore, the regulating rod serves to stop the operating shaft and the jaw from descending, for example, when the vise is used vertically.

In addition to the configuration of the embodiment shown in FIGS. 1 to 4, the embodiment shown in FIG. It is equipped with a branching rod 10 that also serves as a stop for positioning the workpiece. According to this configuration, the front and rear stages of the fixed jaw 2 can be divided into left and right halves, respectively, resulting in a four-stage system for positioning the workpiece. The number of objects to be held can be doubled, and this can be useful mainly for holding a plurality of small workpieces in parallel. Furthermore, when there is a dimensional difference in the thickness of the workpieces placed on the left and right sides of the branch rod 1o, the concave balance rods 5 and 6 rotate around the bosses 3b and 4b, respectively, to compensate for the dimensional difference. It can be absorbed and tightened with equal load on both sides.

The one shown in Fig. 6.7 has several sets of vises 12 supported in parallel on a long vise main body 11. According to this, it is possible to install multiple vises independently. Compared to the above, it can improve overall accuracy, reduce installation time, and reduce equipment costs.
Not only can a large number of small objects be held, but also long objects can be held with high precision even if the clamping force of each vise is slightly different.

Moreover, the one shown in FIG.
The body structure is -.

〔Effect of the invention〕

According to the present invention, by rotating a single operating shaft, the workpiece can be evenly tightened and held from both sides of the fixed jaw, so that the workpiece can be efficiently and accurately held by the vise. In particular, the vise of the present invention is advantageous in holding a large number of workpieces, and furthermore, the reaction force applied to the fixed jaw is canceled out, and the displacement of the fixed jaw can be eliminated. The amount of distortion in the vise body can be suppressed as much as possible, and the cumulative error that occurs when holding a large number of workpieces can be reduced to 1/2 compared to the conventional 1-stage type 2 vise.
Alternatively, since it can be reduced to 1/4, highly accurate machining work can be performed.

[Brief explanation of drawings]

The figures show an embodiment of the vice of the present invention, in which Figure 1 is a plan view, Figure 2 is a side view, and Figures 3 and 4 are respectively similar to Figure 1.
5 is a plan view showing another embodiment; FIG. 6 is a partially omitted plan view showing another embodiment; FIG. 7 is a front view of the same; FIG. 8 is a side view showing yet another different embodiment. 1.11 is the vise body, 2 is the fixed jaw, 3 and 4 are the sliding jaws, 3a and 4a are the left and right female screws, 7 is the operating shaft, 7a,
Reference numeral 7b indicates left and right male screws, and 10 indicates a branch rod.

Claims (4)

[Claims] (1) Sliding jaws having a left female thread and a right female thread are arranged facing each other in a movable manner in the front and rear of the fixed jaw attached to the center of the vise body, and the left and right By screwing together a single operating shaft with a male thread,
A vice characterized in that the operating shaft is movable in the axial direction with respect to the base body together with the sliding jaws. (2) At the upper position of the fixed jaw divided into left and right halves,
The vice according to claim 1, further comprising a branching rod that projects toward each of the front and rear sliding jaws. (3) Claim (1) characterized in that a circular projection is formed on the upper surface of the sliding jaw, and a balance jaw is fitted and mounted on the sliding jaw with the projection as the center of rotation. Vice as described. (4) Claim (1) characterized in that the range of movement of the operating shaft in the axial direction with respect to the vice body is restricted to a predetermined dimension.
).