JPH1094929A - Clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To collect a chip or the chip and cutting oil dropped on a bed to an outside one place in which discharge is easy after rolling down the slant bottom surface of a groove by providing the groove with the slant bottom surface in the intermediate part of a guide for guiding a table on the bed and the outside of respective guides and making a bed structure in which a table drive device can be arranged near both sides or one side of the table while keeping an outside groove. SOLUTION: A fulcrum part 5a provided on the way of front/rear direction X of an arm 5 for clamping is supported to a housing 4 swingably in a vertical direction Z by a main spindle 11 extending to a lateral direction Y. In the lower side of a dynamic point 5b provided on the rear part of the arm 5, a support shaft 34 extending to front/rear direction X is supported to the housing 4 and a drive shaft 36 is fitted externally to the support shaft 34 in a off-centered state. The piston rod 29 of a pneumatic cylinder is arranged so as to extend to the lateral direction Y. By moving the output part 6a provided on the tip of the piston rod 29 in the lateral direction Y, the drive shaft 36 is rotated while off-centering around the support shaft 34 by a lever 37. The outer periphery surface of the drive shaft 36 is connected to the dynamic point 5b through a connecting rod 44 and a push-press tool 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for clamping a mold, a work piece, and the like by an arm swingably supported by a housing.

[0002]

2. Description of the Related Art An example of this type of clamping device is shown in an elevation view in FIG. In this method, a mold 102 is pressed and fixed to a movable plate 101 of a horizontal injection molding machine by a plurality of clamp devices 103. The clamp device 103 includes a housing 104 attached to the movable plate 101,
A clamp arm 105 supported by 104 and swinging in a direction perpendicular to the mold 102 (a direction perpendicular to the plane of the drawing).
And the front and rear direction with respect to the arm 105 (left and right direction in the figure)
And a hydraulic cylinder 106 arranged in series.

[0003]

When the injection molding machine is small, the area of the movable plate becomes small.
The space for installing the clamp device is also reduced. For this reason,
When the above-described conventional clamping device 103 is mounted on the movable platen 101, the rear portion of the hydraulic cylinder 106 projects from the outer peripheral surface of the movable platen 101, and the safety door of the injection molding machine, the handling mechanism of the mold, etc. There was a risk of interference. The same adverse effects as described above occur not only in the illustrated horizontal injection molding machine, but also when a clamping device is used in a vertical injection molding machine, a press machine, a work pallet, or the like.
An object of the present invention is to provide a clamp device having a short length in the front-rear direction.

[0004]

According to a first aspect of the present invention, there is provided a clamping device having the following structure, as shown in FIG. 1 to FIG. 8 or FIG. It is characterized by having done.

A clamp arm 5 extending in the front-rear direction X
Is supported by the housing 4 so as to be swingable in the vertical direction Z by a main shaft 11 extending in the horizontal direction Y, and a driving means 6 extending in the horizontal direction Y is attached to the housing 4, and an output portion 6a of the driving means 6 is The output unit 6a is configured to be movable in the lateral direction Y, and the movement of the output unit 6a in the horizontal direction Y is performed between the output unit 6a and the power point unit 5b of the arm 5 in the vertical direction Z of the arm 5. A transmission means 16 for converting into a swing is provided.

According to a second aspect of the present invention, as shown in FIGS. 1 to 8, for example, the clamping device is configured as follows. A fulcrum 5a provided in the middle of the clamping arm 5 in the front-rear direction X is supported by the housing 4 so as to be swingable in the vertical direction Z by a main shaft 11 extending in the horizontal direction Y, and provided at the rear of the arm 5. A drive shaft extending in the front-rear direction X is disposed below the force-point portion 5b, and the drive shaft is eccentrically fitted to the support shaft, and the drive means extends in the lateral direction Y to the housing 4. 6
The output part 6a of the driving means 6 is configured to be movable in the lateral direction Y, and the drive shaft 36 is connected to the support shaft 34 via the lever 37 by the output part 6a.
And the outer peripheral surface of the drive shaft 36 is connected to the power point 5b.

[0007]

FIG. 1 to FIG. 8 show a first embodiment of the present invention. As shown in the elevation view of FIG. 2, the movable platen 1 of the horizontal injection molding machine is
Is pressed and fixed. The clamp device 3 includes a housing 4 attached to the movable platen 1 and a pneumatic cylinder (drive means) 6 for driving a clamp arm 5 supported by the housing 4. The pneumatic cylinder 6
Is fixed to the housing 4 so as to extend along the periphery of the mold 2.

The structure of the clamp device 3 will be described with reference to FIGS. 3 to 6 and FIG. FIG. 3 is a plan view of the clamp device 3 and is an enlarged detailed view of the arrow III in FIG. FIG. 1A is a diagram corresponding to a cross-sectional view taken along the line II in FIG. 3, and FIG. 1B is a diagram corresponding to FIG.
FIG. 3A is a sectional view taken along line BB of FIG. FIG. 4 corresponds to FIG.
FIG. 4A is a sectional view taken along line IV-IV in FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. In the following description, the left-right direction in FIG. 1A is referred to as a front-rear direction X, and the left-right direction in FIG.
The description will be made with the vertical direction in FIG. 1A and FIG.

As shown mainly in FIGS. 1A and 5,
The front part of the housing 4 is fixed to the movable platen 1 by two fastening bolts 8. The clamp arm 5 is supported on a pair of side walls 9 of the housing 4 so as to be movable in the front-rear direction X and swingable in the vertical direction Z.
More specifically, a guide groove 10 extending in the front-rear direction X is formed on each inner surface of the side walls 9.
0, the end of the main shaft 11 extending in the lateral direction Y is fitted.
The receiving surface 10a of the guide groove 10 faces the upward surface 11a provided at the end of the main shaft 11 from above.
A sliding bearing 12 is provided at a central portion of the main shaft 11 in the longitudinal direction.
And the through hole 13 of the fulcrum 5a of the arm 5 is fitted to the sliding bearing 12.

A power point 5b provided at the rear of the arm 5 is transmitted by a transmission means 16 to the output section 6 of the pneumatic cylinder 6.
a. The arm 5 is swung in the vertical direction Z by the forward and backward movement of the output portion 6a in the horizontal direction Y.

[0011] As shown in FIG.
Is composed of first and second end plates 18 and 19 and a cylinder tube 20, and the first end plate 18 is pressed toward the housing 4 by two long bolts (not shown). Is done. A first working chamber 23 for clamping is formed between the piston 21 inserted into the cylinder tube 20 and the first end plate 18, and a spring 24 for holding a clamped state is mounted in the first working chamber 23. You. Between the piston 21 and the second end plate 19, a second working chamber 26 for unclamping is formed. 27 and 28
Are compressed air supply / discharge ports. Incidentally, the pressure of the compressed air is from about 4 kgf / cm ² to about 5 kgf / cm
About ² (about 0.39 MPa to about 0.49 MPa). The output section 6a is provided at the tip of a piston rod 29 protruding from the piston 21.

As shown mainly in FIG. 1, the transmission means 16 comprises a lever-type first conversion mechanism 31 for converting the movement of the output portion 6a in the lateral direction Y into a rotational movement, and an up-and-down rotating mechanism. The second conversion mechanism 32 for converting the movement into the linear movement in the direction Z
It is constituted by and.

The first conversion mechanism 31 is configured as follows. A support shaft 34 extending in the front-rear direction X is supported on the housing 4 by two sliding bearings 35 below the power point 5 b of the arm 5. A drive shaft 36 cut in a semicircular shape is fitted on the support shaft 34 in an eccentric state.
1 (B) and FIG. 4 indicates the axis of the support shaft 34, and the symbol N indicates the axis of the drive shaft 36. An upper portion of a lever 37 projecting upward from the drive shaft 36 is pivotally supported by the output portion 6a of the pneumatic cylinder 6 so as to be movable in the vertical direction Z. That is, a roller 39 is rotatably supported by a pin 38 provided above the lever 37, and the roller 39 is inserted into the upper and lower grooves 40 of the output portion 6a.

The second conversion mechanism 32 includes a pressing member 43 supported on the housing 4 so as to be able to move up and down, and the pressing member 43
3 and a connecting rod 4 provided between the outer peripheral surface of the drive shaft 36
4 is provided. The rotational movement of the drive shaft 36 is converted into the vertical movement of the pressing tool 43 via the connecting rod 44. Reference numeral 45 in FIGS. 1A and 6 denotes a pin for preventing rotation.

As shown in FIG. 1 (A), a torsion coil spring 51 for urging the arm 5 forward and upward is provided between the implantation pin 50 at the lower part of the arm 5 and the lower part of the housing 4.
(Elastic means) is attached. The arm 5 is moved forward by the urging force of the spring 51, and is swung clockwise about the main shaft 11 so that the point of force 5 of the arm 5 is moved.
b comes into contact with the pressing tool 43.

Further, a link 52 for retreating the arm 5 against the spring 51 is provided. As shown in FIGS. 4 and 6, the link 52 is formed in an L-shape, and is rotatably supported by an eccentric pin 54 formed above an adjustment bolt 53. The U-groove 56 of the long link portion of the link 52 is engaged with the implant pin 50. Also,
An operation pin 58 pivotally supported by the piston rod 29 is engaged with a pressure receiving surface 57 of the short link portion of the link 52.

The operation of the clamp device 3 is described in FIG.
4 and FIGS. 7 and 8. In the unclamped state, the piston 21 and the piston rod 2 shown in FIG.
9 is retracted to the right in FIG. When the output section 6a is advanced leftward by supplying compressed air to the first working chamber 23 in the unclamped retracted state, the arm 5 moves from the retracted position T in FIG. The position is switched to the clamp position R in FIG. Conversely, by supplying compressed air to the second working chamber 26 to retract the output section 6a, the arm 5 at the clamp position R in FIG. FIG. 8 through
To the retreat position T.

More specifically, in the advanced state shown in FIGS. 1A, 1B and 4, the arm 5 is advanced by the spring 51, and further advance is prevented by the front wall of the guide groove 10. . When the output portion 6a is further advanced, as shown in FIG. 7B, the lever 37 is swung in a counterclockwise direction, and the drive shaft 36 is moved to the axis M of the support shaft 34. Is rotated in the counterclockwise direction around. As a result, the driving force of the drive shaft 36 causes the power point portion 5b of the arm 5 to swing strongly upward through the connecting rod 44 and the pressing tool 43 in this order. Then, the action point portion 5c of the arm 5
Is swung downward by a clamp, first contacts the upper surface of the mold 2, and then strongly presses the mold 2. Thereby, the arm 5 is switched to the clamp position R.

To release the clamped state shown in FIG. 7, the output section 6a is moved backward. Then, Figure 1
As shown in (B), the lever 37 rotates the drive shaft 36 clockwise to release the clamping operation force. As a result, the pressing tool 43 and the connecting rod 44 are allowed to descend, and the action point 5
The arm 5 is swung upward, and the arm 5 is switched to the advanced position S.

Subsequently, when the output portion 6a is retracted, the lever 37 further rotates the drive shaft 36 in the clockwise direction as shown in FIG.
3 and the connecting rod 44 are allowed to descend, and at the same time, as shown in FIG.
The arm 5 is switched to the retracted position T against the spring 51 via More specifically, in FIG. 6 described above, when the output unit 6a is retracted downward in the figure,
Since the operation pin 58 pivots the link 52 clockwise through the pressure receiving surface 57, the U groove 56 of the link 52 is formed.
Moves the arm 5 at the advanced position S to the right.

When the output portion 6a is advanced in the retracted state shown in FIGS. 8A and 8B, the arm 51 is moved to the advanced position S by the spring 51 as shown in FIG. While being advanced, the link 5 is
2 is returned to the swiveling position of FIG.
Is driven to the clamp position R in FIG. 7A by the transmission means 16 described above.

The forward / backward position of the arm 5 in the front-rear direction X is
As shown in FIGS. 3 and 4, an advance state detection switch 63 and a retreat state detection switch 64 are provided via a cam 61 attached to the side surface of the arm 5 and a rod 62 supported on the upper part of the housing 4. Is detected by In addition,
As shown in FIG. 3, the rod 62 and the switches 63 and 6
4 is covered by a cover 65.

In the above embodiment, since the driving means is constituted by the pneumatic cylinder 6, the piping work is easier and the pressure fluctuation of the working fluid at the time of controlling the temperature of the mold is smaller than that of the hydraulic cylinder. small.

FIG. 9 shows a second embodiment, in which FIG.
It is a figure corresponding to (A). This second embodiment differs from the above-described first embodiment in the following points. In the following description, members having the same configuration as in the first embodiment are described with the same reference numerals in principle.

The first conversion mechanism 31 for converting the movement of the output portion 6a of the pneumatic cylinder 6 in the lateral direction (the direction perpendicular to the plane of the drawing) into rotational movement includes a turning shaft 67 extending in the vertical direction;
And a lever 68 fixed to the turning shaft 67 and swingable in the lateral direction. The tip of the lever 68 is connected to the output section 6a via a pivot pin 69 and a roller 70.

The second conversion mechanism 32 for converting the rotational movement of the turning shaft 67 into a vertical movement includes a male screw member 72 fixed on the upper part of the turning shaft 67 and a male screw member 72.
And a female screw-type pressing tool 73 screwed into the connector. Although the key 74 is used here to prevent the pressing tool 73 from rotating, other means may be used. For example, the outer peripheral surface of the pressing tool 73 is formed in a square or hexagonal shape, and the pressing tool 73 is fitted into the housing 4 in a detent shape.

The elastic means 51 for urging the clamp arm 5 forward and upward is constituted by a compression coil spring. The elastic means 51 is mounted between the bracket 76 fixed to the lower part of the arm 5 and the lower part of the housing 4. The link 52 forcibly retracting the arm 5 is supported by a support pin 78, and a right link portion in the figure engages with a lower portion of the pivot pin 69,
The left link portion in the figure is engaged with the bracket 76.

The second conversion mechanism 32 only needs to convert the rotational movement into the linear movement, and may be changed as follows, instead of the above-described one using the screw engagement.
That is, a helical inclined cam surface is formed on the upper outer periphery of the above-mentioned turning shaft 67 so as to face upward, and a pressure receiving surface that engages with the inclined cam surface from above is formed on the pressing tool 73. In addition, a spiral arc groove is formed on the outer periphery of the upper part of the revolving shaft 67, and a spiral arc groove is also formed on the inner peripheral surface of the cylindrical pressing member 73. May be filled with a large number of balls.

Each of the above embodiments can be modified as follows. Instead of forming the main shaft 11 separately from the clamping arm 5, it is also possible to form the main shaft 11 integrally with the arm 5 or the housing 4. The clamp arm 5 may be provided with only a vertical swing function, omitting the function of moving forward and backward. The pneumatic cylinder 6 as the driving means
May be omitted from the clamp state holding spring 24 (see FIG. 4), and may be configured as a single-acting spring return type instead of the double-acting type. Further, as the driving means, a hydraulic cylinder may be used instead of the pneumatic cylinder, and further, instead of these fluid pressure cylinders,
A mechanism using a mechanism that is advanced and retracted according to the engagement between the male screw and the female screw may be used.

The elastic means 51 may be a tension spring or a leaf spring, instead of a torsion coil spring or a compression coil spring, or may be an elastic body such as rubber. The clamp arm 5 can be changed as follows instead of the exemplified balance type. That is, the arm is formed in an inverted triangular shape, a fulcrum is provided at a lower portion of the arm, a power point is provided at an upper rear portion of the arm, and an action point portion is provided at an upper front portion of the arm. In this case, it is possible to dispose the transmission means 16 on the rear side or lower rear side of the above-mentioned power point portion, and dispose the output section 6a of the driving means 6 on the lower side or rear side of the transmission means 16. Conceivable.

[0031]

The present invention has the following effects because it is constructed and operates as described above. According to the first aspect of the present invention, the driving means is disposed in a direction substantially orthogonal to the clamping arm extending in the front-rear direction, and the arm can be swingably operated via the transmission means by the output of the driving means. Therefore, as compared with the above-described related art, the driving unit is prevented from protruding rearward, and the length of the clamp device in the front-rear direction can be significantly reduced.

According to the second aspect of the present invention, the above-mentioned transmission means comprises a lever-type first conversion mechanism for converting the lateral movement of the output portion into a rotational movement, and a booster for the rotational movement. Since it is constituted by the second conversion mechanism for converting the movement into the straight movement, the capacity of the driving means can be reduced, and as a result, the clamp device can be made compact.

According to the third aspect of the present invention, the rotation of the first conversion mechanism can be converted into a vertical movement by the second conversion mechanism disposed below the point of force of the clamping arm. Therefore, it is possible to prevent the transmission means from projecting rearward, and to further reduce the length of the clamp device in the front-rear direction.

The second invention of claim 4 has basically the same effects as those of the above-mentioned first to third inventions, but also has the following effects. That is, by rotating the drive shaft eccentrically around the support shaft via the lever, the output of the drive means can be reliably transmitted to the clamping arm, so that the power transmission mechanism can be made strong and compact.

The fifth aspect of the present invention provides the above-described first to fourth aspects.
In addition to the effects of the inventions described above, the following effects are further exhibited. That is, since the clamp arm is movably supported in the front-rear direction with respect to the housing, the operating point of the arm can be retracted from the upper surface of the fixed object such as a mold, and the fixed object can be retracted. It is easy to carry out and carry in. Further, when the output portion of the driving means is retracted to the unclamping side, the arm which has been advanced by the elastic means can be retracted by the link. Also, the configuration can be simplified.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a clamping device according to the present invention. FIG. 1A is a diagram corresponding to a cross-sectional view taken along line II of FIG. FIG. 1 (B) is a cross-sectional view of FIG.
FIG. 4 is a cross-sectional view taken along line B.

FIG. 2 is an elevational view showing a state in which a mold of an injection molding machine is fixed by the clamp device.

FIG. 3 is a plan view of the clamp device, and is an enlarged detailed view of arrow III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV in FIG. 1 (A).

FIG. 5 is a cross-sectional view taken along line VV in FIG.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 1 (A).

FIG. 7 shows the clamp device switched to a clamp state. FIG. 7A is a diagram corresponding to FIG. 1A. FIG. 7B is a diagram corresponding to FIG. 1B.

FIG. 8 shows the clamp device switched to a retracted state. FIG. 8A is a diagram corresponding to FIG. 1A. FIG. 8B is a diagram corresponding to FIG. 1B.

FIG. 9 shows a second embodiment of the clamping device, and is a view corresponding to FIG. 1A.

FIG. 10 is a view showing a conventional example and corresponding to FIG. 2 described above.

[Explanation of symbols]

Reference numeral 4: housing, 5: arm, 5a: fulcrum, 5b: force point, 6: driving means (pneumatic cylinder), 6a: output section, 1
DESCRIPTION OF SYMBOLS 1 ... Spindle, 16 ... Transmission means, 31 ... 1st conversion mechanism, 32
... Second conversion mechanism, 34 support shaft, 36 drive shaft, 37 lever, 51 elastic means (spring), 52 link, X front-back direction, Y lateral direction, Z vertical direction.

Claims (5)

[Claims] 1. A clamping arm extending in a front-rear direction (X).
(5) is supported by the housing (4) so as to be swingable in the vertical direction (Z) by a main shaft (11) extending in the horizontal direction (Y), and the drive extends in the horizontal direction (Y) in the housing (4). Means (6)
The output part (6a) of the driving means (6) is configured to be movable in the horizontal direction (Y) as above, and the output part (6a) and the power point part (5b) of the arm (5) are attached. )
A transmission means for converting the movement of the output portion (6a) in the horizontal direction (Y) into the vertical movement (Z) of the arm (5).
A clamping device provided with (16). 2. The clamping device according to claim 1, wherein the transmission means (16) is arranged laterally with respect to the output part (6a).
A lever type first conversion mechanism (31) for converting the movement of (Y) into a rotational movement, and a second conversion mechanism (32) for converting the boosted rotational movement into a straight movement. A clamping device, characterized in that: 3. The clamping device according to claim 2, wherein the second conversion mechanism (32) is arranged below the force-point portion (5b), and the second conversion mechanism (32) is arranged by the second conversion mechanism (32). First
A clamping device, wherein a rotational movement of a conversion mechanism (31) is configured to be convertible into a linear movement in a vertical direction (Z). 4. A fulcrum (5a) provided at an intermediate portion in the front-rear direction (X) of the clamping arm (5) is swung in the vertical direction (Z) by a main shaft (11) extending in the horizontal direction (Y). The arm (5) is movably supported by the housing (4).
A support shaft (34) extending in the front-rear direction (X) is arranged, and
A drive means (6) extending outside in the lateral direction (Y) to the housing (4), with the drive shaft (36) eccentrically fitted to the housing (4).
And an output portion (6a) of the driving means (6) is configured to be movable in the lateral direction (Y) as described above, and the output shaft (6a) is driven by a lever (37) through the lever (37). (36) is constituted so as to be eccentrically rotatable around the support shaft (34), and the outer peripheral surface of the drive shaft (36) is connected to the force point portion (5b). . 5. The clamping device according to claim 1, wherein the arm is attached to the housing.
(5) is supported movably in the front-rear direction (X) within the set range,
An elastic means (51) for urging the arm (5) forward is provided, and the arm (5) is moved when the output portion (6a) of the driving means (6) is retracted to the unclamping side. Elastic means
A clamping device provided with a link (52) for retreating against (51).