JPH0650136Y2 - Machine vice - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention is applicable to, for example, a milling machine,
The present invention relates to a machine vise for accurately grasping and fixing a workpiece (workpiece) of a machine tool such as a drilling machine, a grinder, a planar machine, an electric discharge machine, etc., between the fixed gripping part and the movable gripping member of this machine vise. Relates to a machine vise capable of gripping a work with a substantially constant gripping force.

[0002]

2. Description of the Related Art A machine vise of this type already proposed has a structure as shown in FIGS. 3 to 5 (Japanese Patent Application No. 1-163339).

That is, in FIGS. 3 to 5, for example, one end of a frame 1 having an L-shaped cross section, which is detachably mounted on a table of a machine tool such as a planer (planing machine), a drilling machine, and a milling machine. A fixed grip portion 1a is vertically formed in the portion, and a balance frame body (balance frame body) 2 having a channel-shaped cross section is arranged in the middle of the frame 1 so as to surround the frame 1. ing. One end 2a of the balance frame 2 is connected to the outside of the fixed grip 1a by a pin 3, and the other end of the balance frame 2 faces the fixed grip 1a and rises 2b. Are formed vertically. Further, on the rising portion 2b, the fixing pin 4 is coaxial with the bush 4a made of a synthetic resin material and the frame 1
The guide rails 5 are mounted on the other end of the frame 1, and the guide rails 5 are formed in parallel on the upper portion of the frame 1. Furthermore, a movable gripping member 6 having a gripping portion 6a is slidably fitted to each of the guide rails 5 by a holding member 7 so as not to slip outside, and the gripping portion 6a is oppositely mounted. A spherical seat 6b is formed on a part of the movable gripping member 6 on the side so that a spherical body 14 of a tightening screw rod 10 to be described later abuts.

On the other hand, an insertion hole 8 is formed in the rising portion 2b so as to be orthogonal to the guide rails 5 and horizontally.
A chamfered adjustment nut 9 is loosely fitted in the insertion hole 8 so as not to come out. Further, the adjusting nut 9 is provided with a tightening screw rod 10 having a knob 10a in parallel with each of the guide rails 5, and the shaft center O1 of the tightening screw rod 10 is the shaft of the adjusting nut 9. It is eccentric by a height h from the center O2. Then, when the work W is held between the fixed gripping portion 1a and the gripping portion 6a of the movable gripping member 6 and the work W is strongly gripped by the tightening screw 10, the balance frame body has a channel-shaped cross section. Even when the (balance frame) 2 is bent in a mountain shape, the adjusting nut 9 is relatively rotated, and the tightening screw 10 presses the work W horizontally. Further, as shown in FIG. 5, the movable gripping member 6 is connected to the distal end portion 10 b of the tightening screw rod 10 by a retaining pin 12 via a ball 11.
Further, the tip end portion 10b of the tightening screw rod 10 is provided with a spherical seat 6b of the movable grip member 6 so as to abut via a spherical body 14 and a load cell (pressure sensor) 15. It is connected to a measuring device equipped with a battery and a panel display device (neither is shown).

Therefore, the machine vise described above is
The fixed grip portion 1a and the grip portion 6a of the movable grip member 6
Workpiece W is inserted between and, and then the above-mentioned tightening screw rod 1
When the sphere 14 at the tip of the tightening screw 10 pushes the spherical seat 6a of the movable gripping member 6 by pinching and turning the knob 10a of 0, the movable gripping part 6 is moved through the load cell 15. To move the fixed grip 1
The work W between a and the grip portion 6a of the movable grip portion 6 is strongly gripped. At this time, the stress received by the fixed gripping portion 1a via the work W is pressed against the rising portion 2a of the balance frame body 2, and this becomes a reaction force and via the rising portion 2ba of the balance frame body 2. Added to the adjusting nut 9. At this time, even if the balance frame body 2 having a channel-shaped cross section is bent into a mountain shape, the adjusting nut 9 relatively rotates to balance the force, and the tightening screw 10 presses the work W horizontally. Therefore, the work W is accurately grasped without being tilted, and it is possible to improve the working accuracy by grinding the machine tool. Further, since the adjusting nut 9 is eccentrically screwed with respect to the tightening screw 10, the work W is pressed downward.

On the other hand, the tightening and gripping stress received by the work W is detected by the load cell 15, and the detection signal is calculated by the measuring device, and the detected signal is applied to the panel display device to show an appropriate tightening and gripping force of the work W in the machine vice. indicate.

[0007]

However, since the above-mentioned machine vice incorporates a measuring device such as a measuring device equipped with a load cell and a battery and a panel displaying device as a means for indicating the tightening and tightening of a work, the entire device is indispensable. Not only becomes complicated, but also assembly and adjustment and maintenance and inspection are troublesome and expensive.

The present invention was devised in consideration of the above-mentioned circumstances, and the tightening scale plate provided at the tip of the tightening screw rod is rotated by a predetermined angle with respect to the fixed mark. Accordingly, it is an object of the present invention to provide a machine vise capable of tightly gripping a work with a substantially constant gripping force between the fixed gripping portion and the movable gripping member.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a frame having a fixed grip portion is connected to a frame so as to surround a balancing frame body, each guide rail is formed in the frame, and the movable gripping members are fixed to the both guide rails. In a machine vice that is fitted to the gripping part so as to grip the facing work, and the tightening screw is screwed on the rising part of the balance frame, a tightening scale plate is provided at the tip of this tightening screw, and this tightening screw is installed. An indicator is attached to the outer wall surface of the movable gripping member on which the scale plate is located.

[0010]

According to the present invention, when the work is tightened and tightened, the graduation on the tightening scale when the spherical portion of the tip of the tightening screw starts to push the spherical seat of the movable gripping member. As a result, confirm with a fixed indicator, and further tighten the screw by tightening the tightening screw, and when the amount of movement from the tightening start point reaches a specified value, the screwing of the tightening screw is stopped, and the tightening force of the work is gripped. Can be kept almost constant.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below.

In the present invention, the same components as those in the above-mentioned specific example will be described with the same reference numerals.

In FIGS. 1 to 3, reference numeral 1 denotes a cross section L which is detachably mounted on a table of a machine tool such as a planer (planing machine), a drilling machine, and a milling machine.
A fixed grip portion 1a is vertically formed at one end portion of the frame 1, and in the middle of the frame 1, a frame-shaped cross section having a channel-shaped cross section is formed. A balance frame body 2 is arranged so as to surround the frame 1 (see FIG. 3). Also, this balance frame 2
One end 2a of the balance frame 2 is connected to the outside of the fixed grip 1a by a pin 3, and the other end of the balance frame 2 faces the fixed grip 1a to form a rising portion 2b vertically. .
Further, on the rising portion 2b, a fixing pin 4 is axially mounted on one end of the frame 1 coaxially with a bush 4a made of a synthetic resin material, and each guide rail 5 is parallel to the upper portion of the frame 1. Is formed. Furthermore, a movable gripping member 6 having a gripping portion 6a is slidably fitted to each of the guide rails 5 by a holding member 7 so as not to slip outward, and the opposite side of the gripping portion 6a. A spherical seat 6b is provided on a part of the movable gripping member 6 of FIG.
It is formed so that the sphere 14 of 0 abuts.

On the other hand, in the rising portion 2b, an insertion hole 8 is bored horizontally orthogonal to each of the guide rails 5,
A chamfered adjustment nut 9 is loosely fitted in the insertion hole 8 so as not to come out outward. Further, the adjusting nut 9 is provided with a tightening screw rod 10 having a knob 10a in parallel with each of the guide rails 5, and the shaft center O1 of the tightening screw rod 10 is the shaft of the adjusting nut 9. It is eccentric by a height h from the center O2. Thus, the fixed grip 1a
When the work W is held between the gripping part 6a of the movable gripping member 6 and the work W is strongly gripped by the tightening screw 10, even if the balance frame body 2 having a channel-shaped cross section is bent into a mountain shape,
The adjusting nut 9 rotates relatively, and the tightening screw 10 presses the work W horizontally. further,
As shown in FIG. 5, the tip end portion 10 of the tightening screw rod 10 is described.
In b, the movable gripping member 6 is connected with a retaining pin 12 via a ball 11. Further, this tightening screw rod 10
As shown in FIG. 1, a thin disk-shaped tightening scale plate 20 is provided at the tip end portion 10b of each of the movable gripping member 6 and the outer wall surface 6c of the movable gripping member 6 on which the tightening scale plate 20 is located. Is attached with an index 21. Furthermore, a spherical seat 6b of the movable grip member 6 is provided on the tip end portion 10b of the tightening screw rod 10 so as to abut via a spherical body 14, and the movable grip member 6 is provided with the tightening screw rod 6. By rotating 10 with a fingertip, it slides along the guide rails 5.

The operation of the present invention will be described below.

The work W is inserted in advance between the fixed gripping portion 1a and the gripping portion 6a of the movable gripping member 6, and thereafter, the knob 10a of the tightening screw rod 10 is pinched and rotated, whereby the tightening is performed. When the spherical portion 14 at the tip of the attached screw 10 pushes the spherical seat 6a of the movable grip member 6, the movable grip portion 6 is pushed, whereby the fixed grip portion 1a and the movable grip portion 6 are moved. The work W between the grip portion 6a is gripped so as to eliminate a gap.

As described above, when the work W is gripped without a gap between the fixed gripping portion 1a and the gripping portion 6a of the movable gripping member 6, the ball portion 14 at the tip of the tightening screw rod 10 is held.
Is the time point when the spherical seat 6b of the movable grip member 6 is pushed. At this time, the scale on the tightening scale plate 20 at which the scale matches the fixed mark is visually confirmed, and further, the tightening screw rod 10 is screwed and tightened, and the mark 21
The moving amount of the graduation of the tightening scale plate 20 is read from, and when the moving amount reaches a predetermined value, the screwing of the tightening screw is stopped, and thereby the work W is tightly gripped with a substantially constant gripping force. be able to.

On the other hand, the fixed grip portion 1a has the work W
Although the stress received through the pressing force is applied to the rising portion 2a of the balance frame body 2 and acts as a reaction force and is applied to the adjusting nut 9 through the rising portion 2ba of the balance frame body 2, the cross section has a channel shape. Even if the balance frame 2 forming
The adjusting nut 9 relatively rotates to balance the force, and the tightening screw 10 presses the work W horizontally, so that the work W is accurately grasped without tilting the work W, and the machine tool is It is possible to improve the processing accuracy by the grinding process. Further, since the adjusting nut 9 is eccentrically screwed with respect to the tightening screw 10, the work W is pressed downward.

The present invention is preferably applied to a small work W.

[0020]

As described above, according to the present invention, the tightening scale plate is fixed to the tip of the tightening screw rod for advancing or retracting the movable gripping member with respect to the fixed gripping part. Since the indicator is installed on the outer wall surface of the movable gripping member so as to correspond, when the tightening screw is screwed to tighten the work, the amount of movement of the scale of the tightening scale plate from the fixed mark is read. By stopping the screwing of the tightening screw when the amount of movement from the tightening start point reaches a predetermined value, the work can be tightly gripped between the fixed gripping portion and the movable gripping member with a substantially constant gripping force.

[Brief description of drawings]

FIG. 1 is a sectional view of a machine vise of the present invention.

FIG. 2 is a cross-sectional view taken along the chain line AA of FIG.

FIG. 3 is a perspective view of a machine vise that has already been proposed.

FIG. 4 is a cross-sectional view of an already proposed machine vise.

FIG. 5 is a plan view of an already proposed machine vise.

[Explanation of symbols]

 1 Frame 2 Balance Frame 5 Guide Rail 6 Movable Grip Frame 10 Tightening Screw 20 Tightening Scale Plate 21 Marking

Claims (1)

[Scope of utility model registration request] 1. A balance frame body connected to a frame having a fixed gripping portion so as to surround the frame, guide rails formed on the frame, and both guide rails facing the fixed gripping portion and gripping a workpiece. In a machine vice provided with a movable gripping member fitted so as to have, and a tightening screw rod screwed to the rising portion of the balance frame, a tightening scale plate provided at the tip end of the tightening screw rod, A machine vice, further comprising: an indicator attached to an outer wall surface of the movable grip member on which the tightening scale plate is located.