JPH071269A - Clamp device - Google Patents

Abstract

PURPOSE:To facilitate installation of a work to the table of a tool machine without increasing a cost and to improve working efficiency. CONSTITUTION:A rotary shaft 71 rotated by a lever 73 is rotatably supported to a jig pallet 21. A drive clamp member 63 is arranged on a rotary shaft 71. A clamp member 52 is coupled to the drive clamp member 63 through a link 61. A cam part to cause a clamp shaft 37 to approach and part from the jig pallet 21 through slide of a clamp support member to support the clamp shaft 37 through rotation is formed to the end part of a rotary shaft 46 coupled to the clamp member 52. A claw part 43 to clamp a work by pressing a work W against the reference bed seat 79 of the jig pallet 21 through engagement with the edge part of the shaft hole of the work W when the clamp shaft 37 is moved in the direction of the jig pallet 21 by means of a cam part is arranged on the clamp shaft 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device for mounting a work on a table of a machine tool when machining the work.

[0002]

2. Description of the Related Art When machining a work such as a cylinder head or a crankcase, the work must be positioned and installed on a table of an NC machine tool or a machine tool such as a machining center. Conventionally, when positioning and installing a work on a table, as shown in FIG. 13, the jig pallet 2 is fixed to the table of the machine tool,
The jig pallet 2 was clamped using the shaft hole 1 formed in the work W. When the work W is clamped on the jig pallet 2 by using the shaft hole 1, the work W is placed on the jig pallet 2 via the reference pedestal 3, and in this state, the shaft hole 1 of the work W is formed. Hebolt 4
The bolt 4 into the threaded hole 5 formed in the jig pallet 2 with an impact wrench or the like to firmly engage the clamp washer 6 with the edge of the shaft hole 1 of the work W, W was clamped on the jig pallet 2.

[0003]

However, in the clamping method for clamping the work W on the jig pallet 2 as described above, the bolt 4 at the clamping location is used.
There is a problem in that the tightening work and the removing work of the bolt 4 after the processing are extremely complicated, and when the bolts are clamped at a plurality of places, the work efficiency further decreases. Further, when the bolts 4 and the jig pallet 2 are clamped by the bolts 4, the bolts 4 and the screw holes 4 of the jig pallet 2 are worn out by repeated use. Therefore, the bolts 4 and the jig pallet 2 are regularly replaced with new ones. However, there is a problem that the cost is increased.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a clamp device capable of extremely easily installing a work on a table of a machine tool without increasing the cost. .

[0005]

A clamp device according to a first invention is a clamp device for clamping and fixing a work on a table of a machine tool, the clamp device being fixed to the table.
A jig pallet on which the work is positioned and installed, and a rotation shaft rotatably supported by the jig pallet,
A drive mechanism that is fixed to the end of the rotation shaft and that includes a lever that rotates the rotation shaft, and a rotation mechanism that is fixed to the rotation shaft of the drive mechanism and rotates with the rotation shaft. A swinging drive crank member, a rotary shaft rotatably provided in parallel with the rotary shaft, a crank member fixed to the rotary shaft, the drive crank member and the crank member, respectively. A power transmission mechanism including a link that is rotatably connected to transmit the swing of the drive crank member to the crank member, and a power transmission mechanism that is formed at an end portion of a rotation shaft of the power transmission mechanism. A large-diameter cam portion whose axis is an eccentric position with respect to the axis, and a cam portion that moves with the rotation of the rotary shaft that is rotated by the swinging motion of the crank member move closer to and away from the jig pallet. Clamp moved in the direction A shaft, a spring for urging the clamp shaft toward the cam portion, and a spring provided at the tip end portion of the clamp shaft, which engages with the work by moving the clamp shaft toward the jig pallet. And a clamp portion composed of a locking piece that presses and clamps this work against the jig pallet.

A clamp device according to a second aspect of the present invention is a clamp device for clamping and fixing a work on a table of a machine tool, the base block having a hollow portion inside and fixed to the table, and A drive mechanism including a rotary shaft rotatably provided in the hollow portion of the base block and a lever fixed to an end of the rotary shaft to rotate the rotary shaft, and the base. A connecting member slidably supported in a slide hole formed in a side portion of the block, and a rotating shaft provided between the connecting member and the rotating shaft of the drive mechanism, By means of a drive transmission mechanism composed of a cam portion that slides the connecting member toward and away from the rotary shaft, and is positioned and fixed to a side portion of the base block. A jig pallet having holes to be inserted and the jig pallet And a clamp shaft that is inserted into the hole of the housing and connected to the connecting member, and that is provided at the tip of the clamp shaft and that slides in the rotation axis direction of the drive transmission mechanism. Due to
It is characterized in that it comprises a clamp portion configured to engage with the work and press the work against the jig pallet to clamp the work.

[0007]

According to the clamp device of the first aspect of the invention, when the rotary shaft is rotated by the lever, the drive crank member is swung with the rotation of the rotary shaft. When the drive crank portion is swung, the swing is transmitted to the crank member by the link, the crank member is also swung, and the rotary shaft fixed to the crank member is rotated. As a result, the clamp shaft of the clamp portion is moved by the cam portion of the rotating shaft in the direction in which the clamp shaft moves closer to and away from the jig pallet.

When the clamp shaft is moved in the direction approaching the jig pallet, the locking piece provided at the tip of the clamp shaft engages with the work,
This work is pressed against the jig pallet and clamped, and this work is set on the table of the machine tool.

According to the clamp device of the second invention, when the rotating shaft is rotated by the lever, the connecting member is moved to the rotating shaft at the side portion of the base block by the cam portion along with the rotation. It is slid in the direction toward and away from it. And
When these clamp shafts are moved in the direction approaching the rotation axis, the piece of paper diameter provided at the tip of this clamp shaft is engaged with the work, and this work is fixed to the side part of the base block. It is pressed against the jig pallet and clamped, and this work is fixed on the table of the machine tool.

[0010]

Embodiments of the clamp device of the present invention will be described below. (First Embodiment) First, a first embodiment of the clamp device of the present invention will be described with reference to FIGS. 1 and 2
In FIG. 1, reference numeral 11 is a clamp device, and the clamp device 11 is fixed to a side surface of a base block 13 fixed via a base 12 to a table such as an NC machine tool or a machining center. .

The clamp device 11 includes a jig pallet 21 fixed to the base block 13 by bolts or the like.
And a plurality of clamp parts 15a, 15a and clamp parts 15b, 15b provided on the jig pallet 21,
The clamp portions 15a, 15a on the jig pallet 21
The power transmission mechanism 23 is provided between the clamp portions 15b and 15b, and a drive mechanism 24 that applies a driving force to the power transmission mechanism 23. And
The works W are clamped and fixed to the clamp portions 15a and 15b of the clamp device 11, respectively, and machined by a machine tool.

Next, the configuration and structure of the clamp portions 15a and 15b of the clamp device 11 will be described with reference to the clamp portion 15b.
Will be described more specifically with reference to FIG. The clamper holding member 31, which is a component of the clamp portions 15a and 15b, is positioned on the jig pallet 21 by the pin 32, and the jig pallet 2 by the screw 33.
It is fixed to 1. In this clamper holding member 31,
A hole 34 is formed, and a cam support member 35 is slidably held in the hole 34. A clamp holding hole 36 is formed at the tip of the cam support member 35, and a clamp shaft 37 having a claw portion (locking piece) 43 fixed at the tip is slid into the clamp holding hole 36. It is movably and rotatably provided.

The center axis of the clamp shaft 37 is displaced from the center of the shaft hole 1 formed in the work W when the work W is positioned and arranged on the jig pallet 21 by a positioning pin 77 described later. Has been done. Therefore, by rotating the clamp shaft 37, the protruding portion 43a of the claw portion 43 fixed to the tip end portion is moved to the edge portion of the shaft hole 1 of the workpiece W positioned and arranged on the jig pallet 21. The facing position and the edge of the shaft hole 1 can be arranged at positions not facing each other. Here, the position facing the edge of the shaft hole 1 is the engaging position, and the position not facing the edge of the shaft hole 1 is the insertion position.

Then, when the workpiece W is positioned and arranged on the jig pallet 21 in a state where the projecting portion 43a of the claw portion 43 is arranged at the insertion position, the projecting portion 43a of the claw portion 43 is moved to the work W. The clamp shaft 37 can be inserted into the shaft hole 1 of the work W without interfering with.

Further, a hole portion 3 through which the clamp shaft 37 is slidably inserted is provided at a tip portion of the cam support member 35.
A spring holding member 39 formed around 8 is screwed and fixed, and between the flange portion 41 formed at the lower end of the clamp shaft 37 and the spring holding member 39,
A disc spring (spring) 42 is provided.

The disc spring 42 urges the clamp shaft 37 toward the bottom of the clamp holding hole 36, and the bearing 4 provided in the clamp holding hole 36.
It comes into contact with 0 and 40. Further, the clamper holding member 31 is formed with a through hole 44 on its side portion, and the cam support member 35 is formed with an elongated cam support hole 45 communicating with the through hole 44. Then, the clamp holding member 31 and the cam support member 35.
Through hole 44 and cam support hole 45 formed in and communicated with each other
One end of a rotary shaft 46 that constitutes the power transmission mechanism 23 is inserted into and disposed in the.

A cam portion 47 having a large diameter is formed near one end of the rotary shaft 46, and the cam portion 47 is arranged in the cam support hole 45. The cam portion 47 is formed in a state of being eccentric with respect to the axis of the rotating shaft 46, and one portion on the outer periphery thereof is located on the rotating shaft 4.
The outer peripheral surface of 6 is flush with the outer circumferential surface of the rotary shaft 6, and the side opposite to the flush position is protruded by the difference in diameter with the rotary shaft 46.

That is, the rotary shaft 46 is rotated, and the cam portion 47 formed on the rotary shaft 46 is rotated while sliding in the cam support hole 45, whereby the cam portion 47 is projected. The outer periphery is moved up and down, the cam support member 35 is slid along with it, and the clamp shaft 37 is moved in a direction in which the clamp shaft 37 approaches and separates from the jig pallet 21.

Next, the power transmission mechanism 23 including the rotary shaft 46.
The specific configuration and structure of the above will be described with reference to FIGS. The other end of the rotary shaft 46 has a clamp portion 15
a, 15a and clamp parts 15b, 15b are connected to a crank part 51 provided between them.

The crank portion 51 includes a crank member 52.
And a tubular joint member 53 through which the rotary shaft 46 is inserted,
And 53. And these joint members 5
The flange portions 54, 54 formed on the reference numerals 3, 53 are fastened and fixed to the crank member 52, and the joint members 53, 53 are rotatable by the bearings 55, 55 fixed to the jig pallet 21. It is supported.

The crank member 52 has a groove 5 on its side.
6 is formed, and a groove (not shown) formed at the other end of the rotary shaft 46 is fitted into the groove 56 so that the crank member 52 and the rotary shaft 46 rotate integrally. It has become. Further, the crank member 52 of each of the crank portions 51 is formed with a projecting connecting portion 57, which is joined to the connecting portion 57 at a predetermined interval by a spacer 58 provided at an intermediate portion. , The links 6 arranged over the respective crank parts 51, 51
Pins 62 and 62 rotatably connect the ends of the pins 1 and 61, respectively.

A drive crank member 63 formed in the same shape as the crank member 52 in a side view is provided between the crank portions 51, 51, and the connection formed on the drive crank member 63. The portion 64 is rotatably connected to the central portion of the links 61, 61 by a pin 65. Further, an intermediate portion of a rotary drive shaft 71 that constitutes the drive mechanism 24 is fixed to the drive crank member 63, and the drive crank member 63 is also rotated with the rotation of the rotary drive shaft 71. It has become.

Next, a specific configuration and structure of the drive mechanism 24 having the rotary drive shaft 71 will be described. The rotary drive shaft 71 that constitutes the drive mechanism 24 includes the bearing 7
It is rotatably supported by the jig pallet 21 by means of 2, 72, one end of which is projected to the side of the jig pallet 21 and the lever 73 is fixed in a state orthogonal to the axis thereof. That is, when the lever 73 is rotated, the rotary drive shaft 71 is rotated, the drive crank member 63 of the drive transmission mechanism 23 is swung, and the links 61, 61 are slid by the swing of the drive crank member 63. It is supposed to be done.

By sliding the links 61, 61, the rotary shafts 46, 46 are rotated via the crank members 52, 52. Further, as shown in FIG. 5, the lever 73 has a predetermined angle (here, within a range between the lever horizontal holding 74 and the lever rotation restricting member 75 provided on the jig pallet 21).
It is designed to be rotated by 110 °).

Further, the jig pallet 21 is provided with positioning pins 77, 77.
When the work W is installed in the work W, the shaft holes 1 and 1 formed in the work W are inserted into the holes 78 and 78 formed in the work W and the shaft holes 1 and 1 formed in the work W are respectively clamped by the clamp parts 15a and 15.
It is arranged so as to face b.

The reference numerals 79, 79 ... Contact the work W so that the work W is horizontal to the jig pallet 21 when the work W is installed on the jig pallet 21. It is a standard pedestal. Also, reference numerals 81 and 8
Numerals 1 ... Locating pins which are fitted to bushes 82, 82 attached to holes formed in the jig pallet 21 to position the jig pallet 21 with respect to the base block 13.

Next, the work of clamping the work W by the clamp device 11 having the above structure will be described. (1) First, the lever 73 is rotated in the direction of arrow a in FIG. 5, and the lever 73 is held by the lever rotation restricting member 75. By doing so, the lever 73 is rotated by a predetermined angle with respect to the jig pallet 21.
The rotation shaft 71 is rotated in the same direction with the rotation of
With the rotation of the rotation shaft 71, the drive clamp member 63 is swung in the same direction (the arrow B direction in FIG. 4).

As a result, the link 61 connected to the drive clamp member 63 is moved in the direction of arrow C in FIG. 4, and the clamps connected to both ends of the links 61 are moved as the links 61 move. Members 52, 52
Are oscillated in the directions of arrows D in FIG. The swinging of the clamp members 52, 52 causes the rotating shafts 46, 46 to rotate, and the cam portions 47 provided at the ends thereof move the cam support member 35 in the arrow E direction in FIG. Then, the clamp shaft 37 is also moved in the direction of arrow E in FIG. 3 together with the cam support member 35, and the space between the reference pedestal 79 and the claw portion 43 is expanded.

(2) In this state, the clamp device 1
The work W is set in each of the clamp portions 15a and 15b of No. 1. That is, the holes 78, 78 formed in the work W are inserted into the positioning pins 77, 77. In this way, the shaft holes 1 and 1 formed in the work W are placed in positions facing the respective clamp portions 15a and 15b, and the shaft holes 1 and 1 are formed.
The respective clamp shafts 37 of the clamp portions 15a and 15b are inserted, and further, the respective reference pedestals 7 are inserted.
The work W is made horizontal with respect to the jig pallet 21 by 9, 79, ....

At this time, the projecting portion 43a of the claw portion 43 fixed to the tip portion of the clamp shaft 37 is fixed to the work W.
The clamp shaft 37 is rotationally adjusted so that the protruding portion 43a of the claw portion 43 is disposed at the insertion position described above so as not to interfere with.

(3) When the workpiece W is positioned and placed on the jig pallet 21, the respective clamp portions 15 are placed.
By rotating the clamp shafts 37 of a and 15b, the position of the protruding portion 43a of the claw portion 43 is arranged at the above-described engaging position. That is, the protruding portion 43a of the claw portion 43 of the clamp shaft 37 is arranged at a position facing the edge portion of the shaft hole 1 of the work W. At this time, the clamp shaft 37
3 together with the cam support member 35 by the cam portion 47.
Since the reference pedestal 79 and the claw 43 are expanded by moving in the direction of the middle arrow E, the protrusion 43a of the claw 43 is formed.
Is located above the work W.

That is, even if the clamp shaft 37 is rotated, the protruding portion 43a of the claw portion 43 is moved to the engaging position without interfering with the work W, and the protruding portion 43 of the claw portion 43 is moved.
A slight gap is formed between a and the edge of the shaft hole 1 of the work W.

(4) Next, in this state, the lever 7
The lever 73 is held by the lever horizontal holding member 74 by rotating 3 in the direction of the arrow in FIG. By doing so, the rotation shaft 71 is rotated in the same direction as the lever 73 with the rotation of the lever 73, and the drive crank member 63 fixed to the rotation shaft 71 is moved in the direction of arrow T in FIG. The link 61 is moved in the direction of arrow H in FIG.

As the link 61 moves in the direction indicated by the arrow H in FIG. 4, the crank members 52, 52 are swung in the direction indicated by the arrow R in FIG. 4, respectively, and connected to the crank members 52, 52. The rotary shafts 46, 46 are rotated in the same direction as the crank members 52, 52,
The cam support member 35 is formed by the cam portions 47 of 6 and 46 in FIG.
As the cam support member 35 is moved in the direction of the arrow N, the clamp shaft 37 is also moved in the direction of the arrow N in FIG. As a result, the protrusion 43 of the claw 43 of the clamp shaft 37
a is brought into contact with the edge portion of the shaft hole 1 of the work W, and the movement of the clamp shaft 37 is stopped.

When the cam portion 47 is further rotated, the clamp shaft 37 and the cam support member 35 are moved by the urging force of the disc spring 42, and the disc spring 42 is moved.
Due to the urging force of
The work W is securely clamped and fixed to the jig pallet 21 by being sandwiched by the projecting portion 43a of the claw portion 43.

After the work (1) to (4) is performed and the work W is clamped and fixed to the jig pallet 21, the work W is machined by the machine tool. (5) After the machining is finished, the work W is clamped by the clamping device 1
When detaching from No. 1, the lever 37 is rotated in the reverse direction (direction of arrow A in FIG. 5).

By doing so, similarly to the operation (1), the rotation shaft 71 is rotated in the same direction as the lever 73 is rotated, and the rotation shaft 71 is rotated.
The drive clamp member 63 is in the same direction (arrow B direction in FIG. 4)
4, the link 61 connected to the drive clamp member 63 is moved in the direction of arrow C in FIG. 4, and the clamp members connected to both ends of the links 61 are moved as the links 61 move. 52 and 52 are respectively swung in the arrow D direction in FIG.

The swinging of the clamp members 52, 52 causes the rotary shafts 46, 46 to rotate, and the cam portion 47 provided at the end of the rotary shafts 46, 46 causes the cam support member 35 to move in the direction indicated by the arrow in FIG. When the cam support member 35 is moved, the clamp shaft 37 is also moved in the arrow E direction in FIG. 5, and the space between the reference pedestal 79 and the claw portion 43 is expanded.

In this state, the clamp shaft 37
The workpiece W can be detached from the clamp device 11 by rotating the to position the protruding portion 43a of the claw portion 43 at the insertion position where the edge of the shaft hole 1 of the workpiece W is not exposed. When the work W is removed, the next work W is clamped by the clamp device 11 and machined in the same manner as the above work.

As described above, according to the clamp device 11 of the first embodiment, the work W is positioned and arranged on the jig pallet 21 and then the lever 37 is rotated to make it extremely easy. The work W can be clamped to the jig pallet 21 of the clamp device 11 to be in a workable state. That is, the work of clamping the work W, which has been complicated in the past, can be greatly simplified, and the work efficiency can be improved.

Further, since the work can be clamped at a plurality of positions at the same time by rotating the lever 37, the working efficiency of the clamp can be further improved. Further, since it is clamped by the urging force of the disc spring 42, the bolts 4 and the jig pallet 2 are periodically replaced with new ones due to wear as in the conventional method of clamping by the fastening force of the bolts 4. It is not necessary to do so, and the cost can be reduced.

(Second Embodiment) Next, a clamp device according to a second embodiment will be described with reference to FIGS. 6 to 12. 6 and 8, reference numeral 101 is a clamp device,
The clamp device 101 is adapted to be fixed to a table such as an NC machine tool or a machining center.

This clamp device 101 includes an octagonal base block 103 having a hollow portion 102 formed therein,
A plurality of clamp portions 104 attached to the side portions of the base block 103 to clamp the work W, and a plurality of rotary shafts 1 provided in the hollow portion 102 in the vertical direction.
Drive mechanism 106 having 05 and 105, and rotating shaft 10
5, 105 and the clamp portion 104, and a power transmission mechanism 107, and levers 108 and 108 fixed to the upper ends of the rotating shafts 105 and 105.

The lower ends of the rotary shafts 105, 105 are
It is rotatably supported by a bearing 111 provided on the bottom of the base block 103, and the vicinity of its upper end is rotated to a hole 113 formed in a lid 112 fixed to the upper surface of the base block 103. It is inserted and supported as much as possible.
That is, by moving the lever 108, the rotary shafts 105, 105 rotate about their axes.

Next, the structure and structure of the power transmission mechanism 107 provided between the rotary shafts 105, 105 and the clamp portion 104 will be described more specifically. This power transmission mechanism 1
The cam portions 114 constituting 07 are fixed to the intermediate portion of the rotary shaft 105 of the drive mechanism 106, and the cam portion 114 has a pair of upper and lower protruding pieces 11 on its side portions.
5, 115 are formed. These protruding pieces 115, 1
As shown in FIG. 7, a cam hole 116 formed in the shape of a long hole in plan view and communicating vertically is formed in 15, and one end side of these cam holes 116 is an inner diameter part 117 and the other end side is formed. The outer diameter portion 118 is formed at a position radially outward of the inner diameter portion 117.

An intermediate portion 119 connecting the inner diameter portion 117 and the outer diameter portion 118 is formed so as to be gradually separated from the axis of the rotating shaft 105 from the inner diameter portion 117 to the outer diameter portion 118. There is. Also, these protruding pieces 115
One end of a connecting member (connecting member) 122 slidably inserted in a sliding hole 121 formed in a side portion of the base block 103 is arranged between the connecting members.
A cam bar 123 is inserted into a hole formed at one end of the cam 22. Cams 124 are rotatably provided on both ends of the cam rod 123.
4 is arranged in a cam hole 116 formed in the protruding portion 115 of the cam portion 114.

A holding hole 126, which is in communication with the sliding hole 121 and into which the bush 125 is fitted, is formed on the side portion of the base block 103. The holding hole 126 is provided with the bush 125. The holding member 127 is fitted in through. The holding member 127 is formed with a recess 128 having a hole at the bottom, and the clamper connecting member (connecting member) 13 is formed in the recess 128 via a disc spring 131.
2 is slidably provided, and the male screw portion formed at the bottom of the clamper connecting member 132 is inserted into the hole formed at the bottom of the recess 128, and the connecting member 122 is provided.
Therefore, the connecting member 122 and the clamper connecting member 132 are connected to each other by being screwed into the threaded portion.

Further, the clamper connecting member 132 includes
A clamper fixing member (coupling member) 135 is fixed to the end surface, and the base end portion of the clamp shaft 141 constituting the clamp portion 104 is screwed into the screw portion 136 because it is formed on the clamper fixing member 135. ing.

The power transmission mechanism 107 having the above-described structure rotates the lever 108, which constitutes the drive mechanism 106, in the direction of the arrow in FIG.
5 is rotated together with the lever 108, and the rotation shaft 105
The cam portion 114 fixed to the
The cam 124 arranged in the cam hole 116 of FIG.
While rolling in 16, inner diameter part 117 to intermediate part 119
And is moved to the outer diameter portion 118.

Then, as the cam 124 moves to the outer diameter portion 118, that is, outward in the radial direction, the connecting member 122 is moved in the direction of the arrow in FIG. 7 and clamped via the clamper connecting member 132. The fixing member 135 is projected outward from the side portion of the base block 103.

Reference numeral 143 in FIG. 6 indicates the clamp unit 1.
Is a positioning member for positioning the jig pallet 144 constituting 04 on the side surface of the base block 103,
A bush 145 fitted into the hole of the jig pallet 144 is fitted into the positioning member 143. Further, reference numeral 146 in FIGS. 6 and 7 denotes an abutting member provided for supporting the jig pallet 144 in parallel with the side surface of the base block 103.

Next, FIG. 9 and FIG. 1 show the structure and structure of the clamp portion 104 attached to the clamp device 101.
It will be explained by 0. As shown in the figure, the jig pallet 144 constituting the clamp portion 104 has a hole 151 formed at the center thereof, and the hole 151 has a base of a cylindrically formed reference boss 152. The ends are mated. A flange portion 153 is formed at an intermediate portion of the reference boss 152, and the flange portion 153 is fastened and fixed to the jig pallet 144 with a screw.

At the center of the reference boss 152, a clamp shaft 141 having a locking mechanism 154 attached to its tip is inserted.
The male screw portion 141a formed at the base end portion of No. 1 is screwed and fixed to the female screw portion 136 of the clamp fixing member 135. Further, a nut 155 is screwed into the external thread portion 141a of the clamp shaft 141, and the screwing amount of the clamp shaft 141 into the clamp fixing member 135 is adjusted by changing the position of the nut 155. It is like this.

A pressing collar 157 is slidably provided at an intermediate portion of the clamp shaft 141, and a recess 158 is formed on the inner peripheral surface of the pressing collar 157. A spring 161 is provided between the bottom of the recess 158 of the pressing collar 157 and the locking mechanism 154, and the pressing collar 157 is biased toward the base end of the clamp shaft 141.

Further, on the reference boss 152, the claw portions 162a, 16a are formed on the inner peripheral surface in the vicinity of the tip end portion and the base end portion.
2b is fixed, and these claw portions 162a and 162b are fixed.
A pushing collar 163, a biasing collar 164, and a spring 165 having a biasing force smaller than that of the spring 161 are provided in this order from the tip end side. The pushing collar 163 and the biasing collar 164 are respectively the reference boss 1
It is provided slidably on the inner peripheral surface of 52, and the urging force of the spring 165 acts on the pushing collar 163 via the urging collar 164, and the pushing collar 163 is urged toward the tip end portion. It is like this.

Further, the push collar 163 has a tapered surface 163a formed on the outer peripheral surface thereof, the diameter of which gradually decreases toward the base end portion. Further, as shown in FIG. 10, the reference boss 152 has a plurality of centering holes 167 formed on its side surface at intervals in the circumferential direction and having a gradually smaller diameter toward the outer peripheral direction. The centering balls 16 are respectively provided in the holes 167.
8 are arranged.

The end surface of the pressing collar 157 on the base end side and the end surface of the pressing collar 163 on the tip end side are radially overlapped with each other.
Along with the movement of the base end of the push collar 163
Is moved toward the base end portion against the biasing force of the spring 165. And this push collar 16
When 3 is moved in the direction of the base end, the centering ball 168 is pressed radially outward by the tapered surface 163a formed on the outer peripheral side of the pressing collar 163, and a part of the centering ball 168 is removed. The centering hole 167 is projected to the outer periphery of the reference boss 152.

Clamping section 104 constructed as described above
As shown in FIG. 10, a reference pedestal 171 is fixed to the jig pallet 144 on the outer peripheral side of the reference boss 152 of the clamp portion 104.
The workpiece W attached to the jig pallet 144 is positioned with respect to the jig pallet 144.

9 and 10, reference numeral 173 is a positioning portion, and this positioning portion 173 is attached to the boss 174 formed on the bottom surface of the work W when the work W is attached to the clamp portion 104. The work W is fitted and positioned in the circumferential direction. Also,
Reference numeral 175 in FIGS. 9 and 10 indicates the clamp portion 104.
10 is a handle attached for carrying, and reference numeral 176 in FIG. 10 is a support metal fitting for supporting the jig pallet 144 of the clamp part 104 to the side surface of the base block 103.

Next, the structure of the locking mechanism 154 attached to the tip of the clamp shaft 141 will be described with reference to FIGS. 11 and 12. As shown in the drawing, the locking mechanism 154 is formed in an annular shape, and has an annular member 182 having a groove 181 formed in the middle portion in the circumferential direction, and an engagement member arranged in the groove 181 of the annular member 182. It is composed of a stop 183. The annular member 182 is formed such that its diameter is slightly smaller than the diameter of the shaft hole 1 of the work W clamped to the clamp portion 104, and a hole portion (not shown) is formed at the center thereof. ing.

Then, the bolt 184 is inserted into this hole and is screwed into the threaded portion formed at the tip of the clamp shaft 141, so that the locking mechanism 154 is fixed to the tip of the clamp shaft 141. It is like this. Further, in the groove portion 181 of the annular member 182, the annular portions 182a and 182 that form the annular member 182 are formed.
There is provided a pair of locking pieces 186, one end of which is rotatably supported by a pin 185 provided over b, and the locking pieces 186 are attached to these pins 185 about the axis thereof. A spiral spring 187 that urges in the direction of the arrow w in FIG. 12 is provided.

A protrusion 188 is formed on the other end side of the locking piece 186, and an arc-shaped elongated hole 189 centering on the pin 185 is formed in the middle portion thereof. A restriction pin 191 provided in the up-down direction over the annular portions 182a and 182b of the annular member 182 is inserted into the elongated hole 189. And this regulation pin 1
The rotation amount of the locking piece 186 is regulated by 91.

On the other end side of the locking piece 186, the pin 1
A hook 193 rotatably supported by 92 is provided, and the hook 193 has a spiral spring 194.
Is always urged in the direction of arrow F in FIG. Then, the locking portion 1 formed at the tip of the hook 193
95 engages with the protrusion 188 formed on the locking piece 186. Incidentally, reference numeral 196 in FIG.
Is a restriction protrusion that restricts the amount of rotation of the hook 193 in the urging direction.

Further, the annular portion 182a of the annular member 182,
An arcuate notch 197 is formed in a position facing the rear end of the hook 193 in the upper annular part 182a of the 182b, and a finger is inserted into the notch 197 from the outer peripheral side of the annular part 182a. The rear end of the hook 193 can be pressed inward in the radial direction. That is, when the rear end portion of the hook 193 is pressed to rotate the hook 193 in the direction of the arrow Y in FIG. 12 against the biasing force of the spiral spring 194, the locking portion 195 of the hook 193.
Is disengaged from the protrusion 188 of the locking piece 186.

As a result, the engaging portion 195 of the hook 193 is
The engagement piece 186 is disengaged from the protrusion 188, and the engagement piece 186 is moved within the rotation range regulated by the elongated hole 189 and the regulation pin 191 by the urging force of the spiral spring 187. 12 is rotated in the direction of the middle arrow w, a part of which is projected from the outer periphery of the annular member 182, and the radial dimension of the locking mechanism 154 is made larger than that of the shaft hole 1 of the work W. There is.

Next, the work of clamping the work W by the clamp device 101 having the above structure will be described. (6) First, the lever 108 is rotated in the arrow direction in FIG. By doing so, the cam portion 114 is rotated in the same direction via the rotation shaft 105 with the rotation of the lever 108, and the cam 124 is moved within the cam hole 116 with the rotation of the cam portion 114. Move relatively while rolling. That is, the cam 124 passes from the inner diameter portion 117 to the middle portion 119 in the cam hole 116, and the outer diameter portion 118.
By moving to the
Move radially outward from the axis of.

As a result, the cam rod 123 moves the clamper connecting member 132 together with the connecting member 122 connected to the cam portion 114 in the direction away from the rotary shaft 105 (the direction of the arrow in FIG. 7), and this clamper is moved. The clamp fixing member 135 connected to the connecting member 132 is also moved in the direction of the arrow W in FIG. 7 and protruded from the side portion of the base block 103. Then, this clamp fixing member 135
The protrusion from the side portion of the base block 103 causes the clamp shaft 141 of the clamp portion 104 screwed and fixed to the clamp fixing member 135 to move in the direction of arrow T in FIG.

(7) In this state, the clamp portion 10
Set the work W to 4 respectively. That is, the shaft holes 1 formed in the works W are inserted into the clamp shaft 141 to bring the bottoms of the works W into contact with the reference pedestal 171, and the bosses 174 formed in the bottoms are fitted to the positioning member 173. To combine.

In this way, the work W is arranged in a state in which the locking mechanism 154 projects from the shaft hole 1 formed in the work W and is positioned in the jig pallet 144 of the clamp part 104. It At this time, the locking piece 186 of the locking mechanism 154 is stored in the groove 181 of the annular member 182.

(8) When the work W is positioned and arranged on the jig pallet 144, the locking pieces 186 of the locking mechanism 154 are projected outward in the radial direction. That is, each hook 193 is inserted by inserting a finger from the arcuate notch 197 formed in the annular portion 182a of the locking mechanism 154.
The rear end of the rear end is pressed radially inward against the biasing force of the spiral spring 194.

In this way, the hook 193 is rotated around the axis of the pin 192 in the direction of the arrow Y in FIG. 12, and the locking portion 195 at the tip of the hook 193 is projected onto the locking piece 186. Removed from 188. That is, the engagement of the locking piece 186 with the protrusion 188 by the hook 193 is released, and the locking piece 186 is rotated by the long hole 189 around the axis of the pin 185 by the urging force of the spiral spring 187. Within the range, it is rotated in the arrow w direction in FIG.

As a result, the locking pieces 186 are projected outward from the outer periphery of the annular member 182 in the radial direction by a predetermined amount, and the projecting portions of the locking pieces 186 are in the shaft hole 1 of the work W. Is arranged at a position facing the edge of the. At this time, since the clamp shaft 141 is moved in the direction of the arrow in FIG.
The locking piece 186 does not interfere with the work W when projecting the locking piece 186 from the outer periphery of the annular member 182, and the edge of the projecting locking piece 186 and the shaft hole 1 of the work W. A slight gap is formed between the part and the part.

(9) Next, in this state, the lever 1
08 is rotated in the arrow mark direction in FIG. By doing so, the rotation shaft 105 is rotated with the rotation of the lever 108.
At the same time, the cam portion 114 is rotated in the same direction, and the cam 1
24 inside the cam hole 116 from the outer diameter portion 118 to the intermediate portion 11
9 and moves relative to the inner diameter portion 117. As a result, the connecting member 122 connected to the cam portion 114 by the cam rod 123 is moved in the direction of the rotating shaft 105 (the S-direction in FIG. 7), and the clamper connecting member 132 and the clamp are fixed as the connecting member 122 moves. The member 135 is retracted.

In this way, when the clamp fixing member 135 is pulled in, the clamp shaft 141 screwed and fixed in the clamp fixing member 135 is pulled in the direction of arrow T in FIG. As a result, the clamp shaft 1
A pressing collar 157 slidably provided on the outer peripheral side of 41.
Is moved together with the clamp shaft 141 in the direction of the arrow T in FIG.
63 is pressed in the direction of arrow T in FIG. 9 by the urging force of the spring 161.

Since the spring 165 has a smaller biasing force than the spring 161, the pushing collar 16
9, the centering ball 168 is pushed outward by the tapered surface 163a of the pushing collar 163, and a part of the centering ball 168 is projected from the centering hole 167. . The sentan ring ball 168, a part of which is projected, is brought into contact with the inner peripheral surface of the shaft hole 1 of the work W, so that the shaft hole 1 of the work W with respect to the clamp shaft 141.
The work W is accurately positioned so that the positions are on the concentric circles.

Further, when the clamp shaft 141 is pulled in, the locking piece 186 protruding to the outer peripheral side of the annular member 182 comes into contact with the edge of the shaft hole 1 of the work W, so that the work W is engaged. Locking piece 1 of stop mechanism 154
It is sandwiched by 86 and the reference pedestal 171, and is securely clamped and fixed to the jig pallet 144.

After the work of (6) to (9) is performed and the work W is clamped and fixed to the jig pallet 144,
This work W is processed by a machine tool. (10) When the work W is to be removed from the clamp device 101 after completion of the machining, the lever 108 is rotated in the opposite direction (the direction indicated by the arrow in FIG. 8).

By doing so, similarly to the operation of (6), the rotation shaft 10 is rotated with the rotation of the lever 108.
5, the cam portion 114 is rotated in the same direction, and with the rotation of the cam portion 114, the cam 124 is moved to the cam hole 1
The cam 124 moves relatively while rolling in 16
In the cam hole 116 from the inner diameter portion 117 to the intermediate portion 1
By moving through 19 to the outer diameter portion 118, the cam rod 123 moves radially outward from the axis of the rotating shaft 105.

As a result, the cam rod 123 moves the clamper connecting member 132 together with the connecting member 122 connected to the cam portion 114 in the direction away from the rotary shaft 105 (the direction of the arrow in FIG. 7), and this clamper is moved. The clamp fixing member 135 connected to the connecting member 132 is also moved in the direction of the arrow W in FIG. 7 to project from the side portion of the base block 103, and the clamp fixing member 135 projects from the side portion of the base block 103. The clamp portion 10 screwed and fixed to the clamp fixing member 135 by
The clamp shaft 141 of No. 4 is moved in the direction of the arrow T in FIG. 9, and the locking piece 186 of the locking mechanism 154 and the reference pedestal 171.
Is expanded and a gap is formed between the locking piece 186 and the edge of the shaft hole 1 of the work W.

In this state, the locking pieces 186 of the locking mechanism 154 are pressed from the outer peripheral side to house these locking pieces 186 in the groove portion 181 of the annular member 182. By doing so, the protrusions 188 of the locking pieces 186 enter into the locking portions 195 of the hooks 193 to be engaged with each other, and the work W can be removed from the clamp portion 104. And when this work W is removed,
Similar to the above work, the next work W is clamped to the clamp device 101.
Clamp to and machine.

As described above, according to the clamp device 101 of the second embodiment, as in the first embodiment described above,
After positioning and arranging the work W on the jig pallet 144, the work W can be very easily clamped to the jig pallet 144 of the clamp device 101 to be in a workable state simply by rotating the lever 108. be able to. That is, the work of clamping the work W, which has been complicated in the past, can be greatly simplified, and the work efficiency can be improved.

Further, since the work can be simultaneously clamped at a plurality of places by the rotation of the lever 108, the working efficiency of the clamp can be further improved. Further, unlike the conventional method of clamping with the fastening force of the bolt 4, it is not necessary to periodically replace the bolt 4 and the jig pallet 2 with a new one due to wear,
The cost can be reduced. In addition, it goes without saying that the clamp devices 11 and 101 of the above-described embodiment change their structures and configurations depending on the shape and size of the workpiece W to be clamped.

[0083]

As described above, according to the clamp device of the present invention, the following effects can be obtained. After positioning and arranging the work on the jig pallet fixed to the table of the machine tool, and then simply rotating the lever, this work can be clamped to the jig pallet and set on the table very easily. It can be in a processable state. That is, it is possible to greatly simplify the work of clamping the work, which was conventionally complicated, and improve the work efficiency.

Further, unlike the conventional method in which the bolts are clamped by the fastening force, it is not necessary to periodically replace the bolts and jig pallets with new ones due to wear, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a clamp device for explaining a configuration and a structure of a clamp device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the clamp device for explaining the configuration and structure of the clamp device of the first embodiment.

FIG. 3 is a cross-sectional view of a clamp part illustrating the configuration and structure of the clamp part of the clamp device according to the first embodiment.

FIG. 4 is a side view of the power transmission mechanism for explaining the configuration and structure of the power transmission mechanism of the clamp device according to the first embodiment.

FIG. 5 is a side view of a lever for explaining a lever that constitutes a drive mechanism of the clamp device according to the first embodiment.

FIG. 6 is a side sectional view of a clamp device for explaining the configuration and structure of the clamp device of the second embodiment.

FIG. 7 is a sectional view in a horizontal plane of the clamp device for explaining the configuration and structure of the clamp device according to the second embodiment.

FIG. 8 is a plan view of the clamp device for explaining the configuration and structure of the clamp device of the second embodiment.

FIG. 9 is a cross-sectional view of a clamp part illustrating the configuration and structure of the clamp part of the clamp device according to the second embodiment.

FIG. 10 is a plan view of a part of the clamp device for explaining the configuration and structure of the clamp device of the second embodiment in a sectional view.

FIG. 11 is a side sectional view of the locking mechanism for explaining the configuration and structure of the locking mechanism provided in the clamp portion of the clamp device according to the second embodiment.

FIG. 12 is a plan view of a locking mechanism for explaining a configuration and a structure of a locking mechanism provided in a clamp portion of a clamp device according to a second embodiment.

FIG. 13 is a cross-sectional view of a clamp portion for explaining a conventional clamping method for clamping a work on a jig pallet.

[Explanation of symbols]

 11, 101 Clamping device 15a, 15b, 104 Clamping part 21, 144 Jig pallet 23, 107 Power transmission mechanism 24, 106 Driving mechanism 37, 141 Clamp shaft 42 Spring (disc spring) 43 Claw (locking piece) 46 Rotation Shaft 47, 114 Cam part 52 Crank member 61 Link 63 Drive crank member 71, 105 Rotating shaft 73, 108 Lever 102 Hollow part 103 Base block 121 Sliding hole 122 Connecting member (connecting member) 132 Clamper connecting member (connecting member) ) 135 Clamp fixing member (connecting member) 151 Hole 186 Locking piece W Work

Claims (2)

[Claims] 1. A clamp device for clamping and fixing a work on a table of a machine tool, wherein the jig pallet is fixed to the table, the work is positioned and installed, and the jig pallet is rotated. A drive mechanism that is composed of a rotatable shaft that is movably supported and a lever that is fixed to the end of the rotary shaft and that rotates the rotary shaft; and a drive mechanism that is fixed to the rotary shaft of the drive mechanism. A drive crank member that is swung with the rotation of the rotating shaft; a rotating shaft that is rotatably provided in parallel with the rotating shaft; a crank member that is fixed to the rotating shaft; A power transmission mechanism including a drive crank member and a link that rotatably connects the crank member to each other and transmits a swing of the drive crank member to the crank member, and a rotary shaft of the power transmission mechanism. Formed on the edge A large-diameter cam portion having an eccentric position as an axis with respect to the axis of the rotating shaft, and the cam portion accompanying the rotation of the rotating shaft that is rotated by the swinging of the crank member allows the jig pallet to be formed. On the other hand, a clamp shaft that is moved toward and away from each other, a spring that biases the clamp shaft toward the cam portion, and a spring provided at the tip of the clamp shaft that moves the clamp shaft toward the jig pallet. The clamping device is configured to include a locking piece that engages with the work and presses the work against the jig pallet to clamp the work. 2. A clamp device for clamping and fixing a work on a table of a machine tool, comprising a base block having a hollow portion inside and fixed to the table, and a hollow portion of the base block. A drive mechanism that is rotatably provided and a lever that is fixed to an end of the rotation shaft and that rotates the rotation shaft, and a drive mechanism that is formed on a side portion of the base block. Provided between the connecting member slidably supported in the sliding hole and the rotating shaft of the drive mechanism, the connecting member is rotated by the rotation of the rotating shaft. The drive transmission mechanism includes a cam portion that slides toward and away from the moving shaft, and a hole portion that is positioned and fixed to a side portion of the base block and through which the connecting member is inserted. Jig pallet,
A clamp shaft that is inserted into the hole of the jig pallet and is connected to the connecting member, and a clamp shaft that is provided at the tip of the clamp shaft and that slides in the rotation axis direction of the drive transmission mechanism. Accordingly, the clamping device comprises: a clamping portion configured to engage with the work and press the work against the jig pallet to clamp the work.