JP3253309B2 - Vise - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vise, and more particularly to a thrust force (thrust) from a pressing force generating mechanism, which is increased by a mechanical boosting mechanism provided inside a frame, through a pressing force transmitting member. To improve the technique of acting on a movable jaw.

[0002]

2. Description of the Related Art Generally, in the vise of a machine tool, a fixed jaw is provided on a frame (also referred to as a base) fixed to a machine table, and a movable jaw is opposed to the fixed jaw. The work screw is tightened by rotating a drive screw horizontally mounted on a frame that is screwed with the movable jaw and moving the movable jaw in the tightening direction.

[0003] In this specification, the expression "front and rear" will be used hereinafter, where "front" indicates the fixed jaw side and "rear" indicates the movable jaw side.

[0004] Some vises incorporate a booster mechanism to further increase the thrust force by the rotation of the drive screw to obtain a large tightening force. This includes a hydraulic type and a mechanical type. The mechanical booster mechanism is more frequently used than the hydraulic booster mechanism because it does not require a complicated structure for supplying hydraulic pressure and has high structural strength.

[0005] In these conventional vise, a mechanical booster mechanism is arranged behind a fastening area formed between the fixed jaw and the movable jaw, that is, near the movable jaw. In this case, the strong tightening force generated when the work is tightened presses the movable jaw against the fixed jaw using the drive screw screwed into the rear portion of the frame as a foothold. For this reason, the reaction force of this strong tightening force acts rearward on the rear end of the frame via the drive screw. Due to this reaction force, the frame is greatly warped, and is displaced in a direction in which the base in contact with the work spreads. As a result, the accuracy of the tightening position and, consequently, the working accuracy for the tightened work are reduced. If a reinforcement structure is provided at the rear end of the frame in order to avoid this, the retreat position of the movable jaw is restricted by the presence of the reinforcement structure, and the tightening width is reduced accordingly. On the other hand, by arranging the booster mechanism at a position below the movable jaw in the frame, the length of the entire frame can be reduced, but in this case, the height of the frame becomes large, and the whole vise is large. I can't help escaping.

In the device proposed in US Pat. No. 4,223,879, a hydraulic chamber is provided on the fixed jaw side of the frame, and pressure oil is externally supplied to the hydraulic chamber. . With this structure, the base can be prevented from spreading due to the warpage of the frame. However, this device has a complicated structure including hydraulic equipment and piping in order to supply pressure oil from the outside. Further, since the pipe extends in the shape of a machine table, workability is poor.

[0007]

For the above reasons, in the conventional vise, the booster mechanism is generally arranged on the rear side in the frame, that is, near the movable jaw.
For this reason, the frame warps at the time of tightening and the base spreads,
Machining accuracy is greatly reduced. In addition, the vise could not be reduced in size. The provision of an externally supplied hydraulic chamber as in the US patent complicates the structure and reduces workability.

[0008]

According to a vise of the present invention, a fixed jaw is fixed on a frame, and a movable jaw movable in the longitudinal direction of the frame behind the fixed jaw on the frame. A first support shaft having a threaded portion screwed to the movable jaw at the rear portion is rotatably and axially slidable with respect to the frame, and is provided at the front portion of the first support shaft. A first projection having a first surface directed rearward is provided in the radial direction, and a second support shaft connected to the first support shaft at the rear portion so as to be relatively non-rotatable is connected to the first support shaft. A second surface, which is coaxial with, rotatably and axially immovably disposed at the front of the frame, and having a second surface facing forward.
Of the second support shaft is protruded radially inward at the rear portion of the second support shaft, and a pressing force transmitting member is slidably inserted in any of the supporting shafts in the axial direction, and is connected to the pressing force transmitting member. The booster mechanism is disposed at a position below the fixed jaw, the pressing force transmitting member is provided with a pressing force generating mechanism for generating a pressing force directed toward the mechanical booster mechanism, and the first mechanically boosting mechanism is used as the mechanical booster mechanism. An actuating member is provided which comes into contact with each of the surface and the second surface, and presses the first and second surfaces by inputting an axial force received from the pressing force transmitting member.

[0009]

According to the above construction, the pressing force generated by the pressing force generating mechanism such as the drive screw or the cylinder acts on the operating member of the booster mechanism via the pressing force transmitting member. The pressing force applied to this operating member is increased and acts on the first and second support shafts via the first and second surfaces.
Further, the force applied to the first support shaft moves the movable jaw connected thereto toward the fastening direction fixed jaw. The force acting on the second support shaft acts to prevent the frame from warping from the fixed jaw toward the movable jaw.

[0010]

FIG. 1 shows a first embodiment of a vise according to the present invention, in which a booster structure is a lever type. In the figure, the upper half shows the state at the time of tightening, and the lower half shows the state at the time of non-tightening. The essential parts of this lever-type booster mechanism are shown in FIGS.

A fixed jaw 4 is fixed at a position near a front end on a frame 2 provided on a machine table (not shown). A first support shaft 6 is horizontally disposed in the frame 2 and is assembled to the frame 2 so as to rotate and slide in the axial direction. The movement of the first support shaft 6 in the sliding direction is restricted by the second support shaft 12 and a mechanical booster mechanism as described later.
The first support shaft 6 has a hollow structure over its entire length, and has a rearwardly directed first end at an end near the fixed jaw.
A first projection 6a having a surface 6b is provided to project inward in the radial direction. A space for accommodating the rear end of the second support shaft 12 is further formed at this end. This first
The support shaft 6 is operatively connected to the movable jaw 10 via a nut 16 which is screwed with a screw portion 6c in the middle in the longitudinal direction. The movable jaw 10 is opposed to the fixed jaw 4 with the tightening area therebetween, and moves toward the fixed jaw 4 with the rotation of the first support shaft 6 to tighten and clamp the work between the two jaws.

A second support shaft 12 is provided at the front end of the frame 2.
Are rotatably mounted coaxially with the first support shaft 6. The flange portion of the second support shaft 12 is
It is accommodated between the bracket 8 fixed to the front end of the frame 2 with bolts 35 and the front end surface of the frame 2 via a bearing 36 so as to be rotatable and prevented from moving in the axial direction. As shown in FIG. 4, the second support shaft 12
The rear end has a second surface 12b facing forward.
Projection 12a extends radially inward. As shown in FIG. 5, the second protrusion 12 of the second support shaft 12
a is housed in the internal space of the first support shaft 6. Second
The pin 14 provided at the rear end of the support shaft 12 is loosely fitted into the pin hole 15 formed in the front end surface of the hollow portion of the first support shaft 6, so that the second support shaft 12 is It can rotate together with the support shaft 6 and does not interfere with the axial movement of the first support shaft 6.

A compression spring 26 is interposed between the support shafts 6 and 12, and the urging force of the compression spring 26 acts on the front end face of the support shaft 6 as a rearward force from the frame 2. This backward force pushes the first support shaft 6 rearward into the frame 2 as shown in the lower half of FIG. 1 when not tightened, and is compressed as shown in the upper half when tightened and the first support shaft 6 In the frame 2 is allowed to move forward.

A driving screw 18 extends in the first support shaft 6 so as to be slidable in the axial direction, and the front end of the screw is located below the fixed jaw 4. A male screw is formed slightly behind this, and a sleeve 20 fixed to the first support shaft 6 by a pin 22 is screwed into the male screw. The sleeve 20 is connected to the drive screw 18 via a clutch 24 that is rotationally locked (for example, by a key) at the front end of the drive screw 18. Here, the screw portion of the driving screw 18 and the sleeve 20 screwed thereto constitute a pressing force generating mechanism for generating a thrust force applied to the booster mechanism, and the shaft portion of the driving screw 18 forms a pressing force transmitting member. ing.

A mechanical booster mechanism 30 is connected to the front end of the drive screw 18 at a position below the fixed jaw 4. This intensifying mechanism 30 is, for example, a Japanese Utility Model Laid-Open No. 2-12774.
No. 1, the lever-type structure disclosed in US Pat. In the present invention, a special structure as described below is employed to dispose such a booster mechanism near the fixed jaw 4.

As shown in FIGS. 2, 4 and 5, the above-described booster mechanism 30 is a pair of upper and lower wedge-shaped booster levers 31.
(Functioning as an operating member) and a wedge-shaped cotter 32 rotatably attached to the front end of the drive screw 18. Here, the rear slope of the booster lever 31 and the front slope of the cotter 32 are engaged via balls 33 housed in the respective long grooves. The pair of upper and lower boost levers 31 are arranged so as to slightly swing about a contact portion 31c of the second projection 12a of the second support shaft 12 with the second surface 12b as a fulcrum.

More specifically, each booster lever 3
1 has a first shoulder having a front-facing surface 31a, and this shoulder is the first projection 6a of the first projection 6a formed in the hollow portion of the first support shaft 6. Abuts on the surface 6b. Each of the boost levers 31 is formed with a second shoulder having a rearward-facing surface 31b, and this shoulder is formed on the second projection 1 formed on the second support shaft 12 described above.
It is in contact with the second surface 12b of 2a from the front. These contact states are always maintained by the urging force of the spring 26.

The operation of the first embodiment of the present invention will be described below. First, when the drive screw 18 is rotated in the tightening direction by manual or automatic operation, this rotation is performed via the clutch 24 which is keyed to the drive screw 18 and the sleeve 20 which is engaged with the clutch.
Is transmitted to the supporting shaft 6, and the shaft starts rotating. With this rotation, the movable jaw 10 screwed to the first support shaft 6 moves in the tightening direction. This movable jaw 1
When the work starts to be tightened between the jaws 4 and 10 due to the movement of 0, the tightening torque increases. When the torque exceeds a predetermined value, the clutch 24 and the sleeve 20 are disengaged, and the rotation of the first support shaft 6 stops.

When the drive screw 18 is further rotated in this state, the drive screw 18 screwed to the sleeve 20 moves in the tightening direction with respect to the first support shaft 6. Along with this, the cotter 32 attached to the front end of the drive screw 18 also moves in the tightening direction.
Invade between one. At this time, the first shoulder 31a of the booster lever 31 is regulated by the inner peripheral surface of the first support shaft 6, so that the booster lever 31 swings around the contact point 31c. Then, using the second surface 12 b of the second support shaft 12 as a scaffold, the surface 31 a of the booster lever 31
The first surface 6b of the projection 6a is pressed in the tightening direction.

At this time, the rearward movement of the second support shaft 12 is restricted by the front end of the frame 2 via the bearing 36, while the first support shaft 6 is free to move forward. Has become. For this reason, the pressing force increased by the wedge effect of the booster mechanism and the boosting action by the lever ratio is directly transmitted to the movable jaw 10 via the first support shaft 6, and contributes to an increase in the work clamping force. In this way, the tightening reaction force of the movable jaw 10 is received by the front end of the frame 2 on the fixed jaw 4 side via the first support shaft 6, the booster mechanism 30, and the second support shaft 12. Therefore, it is not necessary to provide a member for receiving the force increased by the force increasing mechanism at the rear end of the frame 2 as in the related art. Also, the frame 2 does not warp.

FIG. 3 shows a second embodiment of a vise of the present invention, in which a booster mechanism is a toggle type. Hereinafter, only portions different from the embodiment of FIG. 1 will be described. Also in this case, the upper half in the drawing shows the state at the time of tightening, and the lower half shows the state at the time of non-tightening. Here, a toggle structure is provided between a first surface 6b which is located at a front portion of the first support shaft 6 and faces rearward and a first surface 12b which is located at a rear portion of the second support shaft 12 and is directed forward. Are located in

A plurality of slits 12c are formed in the cylindrical portion at the rear of the second support shaft 12. An extension member 6d, which is a part of a cylindrical portion extending rearward from the front portion of the first support shaft 6, enters the inside of these slits 12c so as to be able to advance and retreat. The second support shaft 12 is connected in the rotation direction. A nut 12a is screwed into a rear inner peripheral surface of the second support shaft 12, and a front side surface of the nut 12a constitutes the above-described front-facing second surface 12b. The extension member 6
A storage unit is provided further forward of d. The storage portion stores the cup-shaped toggle that has entered the cylindrical portion of the second support shaft 12, and the bottom portion 6a forms the first surface 6b facing backward. In this embodiment, the bottom 6a of the storage section corresponds to the projection in the first embodiment of the present invention. The operation of this embodiment is substantially the same as that of the first embodiment, and a description thereof will be omitted.

In the above embodiment, a pressing force generating mechanism is constituted by a screw provided on the drive shaft and a sleeve screwed to the screw, and the driving screw itself has a pressing force transmitting member. The cotter 32 is moved by applying a thrust force to the cotter 32 by the drive screw and the drive screw. A hydraulic cylinder may be used instead of such a drive screw. In this case, the drive source is not limited to human power, and a hydraulic pump or a motor may be used.

In the above-described embodiment, not only the thrust force is applied to the mechanical booster mechanism by the rotation of the drive screw 18 but also the movable support jaw 6 is rotated to move the movable jaw 10. . However, the present invention is not limited to this, and the drive screw may be used only to apply a thrust force to the mechanical booster mechanism, and the rotation of the first support shaft 6 may be directly performed by another lever. Further, the mechanism for moving the cotter 32 may be installed at any of the front end, the rear end and the inside of the vise.

[0025]

According to the present invention, in the frame below the fixed jaw, these surfaces are provided between the surface facing forward of the first support shaft and the surface facing backward of the second support shaft. , And the thrust force of the cotter increased by the booster mechanism is applied to the movable jaw via the first support shaft on the one hand, and originally to the movable jaw via the second support shaft. It acts on the front end of the structurally strong frame. Therefore, not only a large clamping force is obtained, but also the clamping force of the movable jaw is moved rearward with respect to the fixed jaw side frame via the first support shaft, the mechanical booster mechanism, and the second support shaft. Although it acts, it does not act rearward on the rear end of the frame via the second support shaft, so that the frame does not warp and the accuracy of the tightening position is improved. Further, since the reaction force does not act on the rear portion of the frame, there is no need to arrange a member for receiving the reaction force in the rear portion. Therefore, the tightening width is not restricted, so that the frame length can be increased and the size can be reduced as compared with the conventional vise.

[0026]

[Brief description of the drawings]

FIG. 1 is a sectional side view showing a vise position embodiment of the present invention.

FIG. 2 is a perspective view of a booster lever of the lever type booster mechanism.

FIG. 3 is a sectional side view showing another embodiment of the vise of the present invention.

FIG. 4 is a perspective view of a main part of the first embodiment.

FIG. 5 is a perspective view of a main part in the same manner.

[Explanation of symbols]

 2 Frame 4 Fixed jaw 6 First support shaft 10 Movable jaw 12 Second support shaft 18 Pressing force transmitting member 30 Mechanical booster mechanism

Claims (3)

(57) [Claims] 1. A fixed jaw fixed on a frame ,
Solid and longitudinally movable in the movable jaw of the oppositely arranged been frame to the constant jaw is slidably provided inside capable and in axial rotation relative to the frame, a screw portion screwed to the movable jaw to the rear A first support shaft having: a first protrusion having a first surface projecting in a radial direction at a front portion of the first support shaft, and having a first surface facing rearward; and a first support shaft coaxial with the first support shaft. A second support shaft rotatably and axially immovably disposed at the front of the frame and connected to the first support shaft so as to be relatively non-rotatable, and a radius at a rear portion of the second support shaft. A second protrusion protruding inward in the direction, having a second surface facing forward, a pressing force transmitting member slidably inserted in any of the support shafts in the axial direction, and a lower portion of the fixed jaw. A mechanical booster mechanism disposed at the side of the side and connected to the pressing force transmitting member; Comprising a pressing force generating mechanism for generating a pressing force toward the mechanism, it is arranged below the fixed jaw
An operation in which the mechanical booster mechanism contacts the first surface and the second surface, and presses the first and second surfaces by inputting an axial force received from the pressing force transmitting member as an input. A vise characterized by having members. 2. The vice according to claim 1, wherein the mechanical booster mechanism is a lever type. 3. A vise according to claim 1, wherein said mechanical booster mechanism is of a toggle type.