JPH01240241A - Fluid pressure returning type spring clamp - Google Patents

Abstract

PURPOSE:To make clamping force constant even when the thickness of an object to be fixed is changed by providing a clamp drive starting position adjusting member between the output portion of a piston and the input portion of a clamp member and enabling the adjusting member to be advancingly/ retractingly operated by means of a fluid pressure control type operating device. CONSTITUTION:In an unclamping condition A, fluid pressure is fed into a fluid pressure operating chamber 7 driving a piston 6 slightly leftward with respect to a clamp body 3 to disconnect a piston output portion 6a from a clamp member input portion 4a. Then, an unshown fluid-pressure control type operating device retracts a clamp drive starting position adjusting member 14 to a lower retracting position Y while moving the clamp body 3 rightward for an unclamping operation by an unshown clamp body returning means. In a clamping condition, the adjusting member 14 is advanced to an upper advanced position X driving the clamp body 3 leftward to be brought into contact with an object to be fixed W. Then, as the pressure in the operating chamber 7 is removed, the output portion 6a is linked to the input portion 4a and a clamp spring 9 presses a clamp member 4.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a fluid pressure return type spring clamp that is unclamped by fluid pressure such as oil pressure or air pressure, and is driven by a clamp spring. This is a technology that keeps the clamping force constant even when the device is turned upside down.

(Basic structure as premise) This type of fluid pressure return type spring clamp is excellent in that the clamp operation can be easily performed remotely, and in that it prevents a decrease in clamping force due to fluid pressure leakage in the clamped state. Its basic structure is as follows.

For example, as shown in FIG. 1 to FIG. 5 or FIG. 9 to FIG. In an unclamping operating state A in which a pressure operating chamber 7 is formed, a clamp spring 9 is attached to the other side of the piston 6, and working fluid is supplied from the fluid pressure supply/discharge port P to the unclamping fluid pressure operating chamber 7. By using the fluid pressure to return the piston 6 to the clamp body 3 against the spring force of the clamp spring 9, the clamping tool 4 interlocked with the piston 6 is driven toward the unclamping side. Fluid pressure supply and discharge port P
In the clamp operating state C in which the working fluid in the unclamping fluid pressure operating chamber 7 is discharged from the clamp body 3, the piston 6 is driven forward with the spring force of the clamp spring 9 against the clamp body 3,
The clamping tool 4 is configured to be driven toward the clamping side.

(Prior Art) In the basic structure shown in lx, the structure of the part connecting the clamping tool 4 to the piston 6 has conventionally been such that the output part 6a of the piston 6 is connected to the piston 6 as shown in FIGS. 9 to 11. The only thing left to do was to fix the input section 4a of the clamp tool 4.

(Problems to be Solved by the Invention) The conventional structure described above operates as shown in FIG.

In each of the drawings (aXb) and (C) of FIG. 11, the symbol A indicates the unclamp operating state, the symbol C1 indicates the thick clamp operating state, and the symbol C2 indicates the thin clamp operating state.

In the unclamping operating state A, as shown in FIG. 1 (C), the piston 6 is
, the clamp body 3 is operated as a right side hair clamp, and the clamp spring 9 has a free length Lo as shown in FIG.
The clamp spring 9 is compressed to the unclamping length Ll, and the clamp spring 9 is at the clamping tension (F+) as shown in FIG.

During clamp driving, the fluid pressure in the fluid pressure working chamber 7 is discharged from the unclamping operating state A described in "1". Then, the clamp spring 9 clamps the clamp body 3 to the left, moves along the spring straight line "2" in the figure (a) from point A to point 0, and as the length of the spring increases, the spring force F increases.
The object W to be fixed is clamped even though the pressure decreases.

1. When the clamp is driven, as shown in FIG. 2 (C), if the object W to be fixed is thick, the thick clamp is in the operating state C1. As shown in Figures (a) and (b), the clamping spring 9 has a small extension film from the unclamping operating state A, and the amount of decrease in the spring force F is small, so the clamping tension F, The clamping tension F is only slightly smaller than the above-mentioned clamping tension F.

On the other hand, as shown in FIG. 3 (C), when the object W to be fixed is thin, the thin clamp is in the operating state C7. As shown in Figures (a) and (b), the clamp spring 9 is in the unclamp operating state A.
Since the tangle elongation jln is large and the amount of decrease in the spring force F is large, the clamping tension F3 becomes automatically small.

Since the conventional structure operates as described above, there are the following problems.

(a) As the thickness of the object W to be fixed becomes thinner, the clamping force becomes smaller.

(b) As the thickness of the fixed object W becomes thinner, the amount of expansion of the clamp spring 9 increases, and the required supply amount of working fluid for unclamping operation also increases in proportion to this, which consumes manpower and labor. The quantity is large.

(c) Furthermore, as described above, the required supply amount of working fluid for unclamping operation increases, and therefore the operation time for clamping and unclamping becomes longer.

The purpose of the present invention is to maintain a constant clamping force even if the thickness of the object to be fixed changes, to reduce the amount of labor and labor consumed during the operation of the anno-clamp, and to shorten the operation time for clamping and unclamping. shall be.

(Means for Solving the Problems) In order to achieve the above-mentioned objects, the present invention provides, for example, as shown in FIG. 1 to FIG. 5, FIG. 6, FIG. 7, or FIG.
The basic structure described above is characterized in that the structure of the portion connecting the clamp tool 4 to the piston 6 is configured as follows.

That is, a clamp drive start position adjuster 14 is interposed between the output part 6a of the piston 6 and the manual force part 4a of the clamp tool A, and the clamp drive start position adjuster 14 is a fluid pressure controlled operating device 17, The tool input section 4a is connected to the piston output section 6.
The fluid pressure-controlled operating device 17 is configured to be able to move forward and backward from a retreat position Y where it retreats toward the unclamp side with respect to a toward an advance position X where it advances toward the clamp side.
Then, after the fluid pressure in the fluid pressure operating chamber 7 starts to unclamp the piston 6, the clamp drive start position adjuster 14 is retracted to the retracted position Y, and in the clamp operating state C, the clamp spring 9 is A horizontal line is drawn so that the clamp drive start position adjuster 14 is advanced to the advanced position X before the piston 6 is driven to clamp.

(Operation) The spring clamp 2 of the present invention operates as shown in FIG. 5, for example.

In each of the figures (a), (b), and (c) of FIG. 5, the symbol A indicates the unclamp operating state, the symbol C1 indicates the thick clamp operating state, and the symbol C6 indicates the thin clamp operating state.

In the unclamp operating state A, the operation is as shown in FIG. 1 (C). That is, by pressurizing fluid pressure into the fluid pressure working chamber 7, the piston 6 is slightly driven to the left with respect to the clamp body 3, and the connection between the piston output section 6a and the clamp tool input section 4a is released. Subsequently, a fluid pressure controlled operating device 17 (not shown) moves the clamp drive start position adjuster 14 backward to the lower retreat position Y, and a clamp body returning means 15 (not shown) moves the clamp body 3 to the right side hair clamp operation. let In this unclamp operation letter benefactor (
b) Clamp spring 9 or free length as shown. The length for unclamping is compressed from 1 to 2, and the spring force F of the clamp spring 9 becomes the tension for clamping F1 as shown in FIG.
It has become.

Ku. Then, first, the fluid pressure controlled operating device 17 advances the clamp drive start position adjuster 14 to the upper advanced position X, thereby driving the clamp body 3 to the left and bringing it into contact with the object W to be fixed. When the fluid pressure is subsequently discharged from the fluid pressure working chamber 7, the clamp spring 9 slightly drives the piston 6 to the right, thereby connecting the piston output portion 6a to the clamp tool input portion 4a. As a result, the clamp spring 9
However, the clamping tool 4 is pushed to the right side via the piston 6 and the clamp drive start position adjusting tool 14, and the clamp body 3 suppresses the object W by the reaction force of the pushing.

When the clamp is driven, as shown in FIG. 2 (C), if the object W to be fixed is thick, the thick clamp is in the operating state C4. And unclamp operation state A
When switching from to thick clamp state C1, <a)
As shown in the figure and (b), as the clamp body 3 moves to the left, the clamp spring 9 moves from point A to the free running distance Q while keeping its spring force F at the clamping tension F1. move to the left side, and then move the clamp to the left side.
The piston 6 is driven to clamp by the tension F2 for clamping.

Furthermore, when switching from the unclamping operating state A to the thin clamping operating state C7 shown in FIG. Therefore, as shown in FIGS. (a) and (b), as the clamp body 3 moves to the left, the clamp spring 9 moves away from point A while keeping its spring force F at the clamping tension F1. The piston 6 is moved entirely to the left over an empty running distance Q, and then extended by a clamping extension jle, and the piston 6 is driven to be clamped using the clamping tension F.

In this way, even in the thin-walled clamp operating state C2, the elongation star of the clamp spring 9 extends in the same way as in the thick-walled clamp operating state C1, so that the clamping force does not decrease.

Further, the spring force of the clamp spring 9 in the clamp operating state C becomes smaller by an amount corresponding to the clamping extension me from the spring force F in the unclamping operating state. This spring extension ff1e is the piston output portion 6a
Since only a small amount is required to connect and disconnect the clamping device input section 4a, the clamping spring 9 has a strong spring force that is almost the same as that in the unclamping operating state A. can get.

(Effects of the Invention) Since the present invention is configured and operates as described in item 1, it has the following effects.

(a) Even if the thickness of the object to be fixed changes, the amount of extension of the clamp spring does not change, so the clamping force can be kept constant.

Moreover, since the amount of elongation described in ``1'' is only required to connect and disconnect the piston output part and the clamp tool input part, the amount of decrease in spring force is small and is almost the same as in the unclamped state. A spring force is obtained. Therefore, the spring clamp is strong and can secure the lamp force.

(0) Also, even if the thickness of the object to be fixed becomes thinner, the amount of the clamp spring remains the same, so the required supply amount of working fluid to operate the anno-clamp is the same as in the case of thick-walled clamps. Yes, it consumes less energy.

(c) Furthermore, as mentioned above, the required supply amount of working fluid for unclamping operation is small, so the IMI during clamping/unclamping operation is short.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

(First example) 1 to 5 show a first embodiment.

In the longitudinal cross-sectional view of FIG. 2, a workpiece (object to be fixed) W placed on two sides of a fixing base 1 such as a work pallet can be pressed and fixed by a hydraulic (fluid pressure) return type spring clamp 2.

This spring clamp 2 applies pressure 4]](
The clamping tool 4 is driven to return to the unclamping side by supplying working fluid), and the pressure oil is discharged from the clamp body 3 to drive the clamping tool 4 toward the clamping side by a springing force.

The piston 6 is slidably inserted into the clamp body 3 in a tight and slidable manner. An unclamping fluid pressure chamber 7 is formed on one side of the piston 6, which is the second side. Further, a clamp spring 9 is attached to a spring chamber 8 formed on the lower side, which is the other side of the piston 6. This clamp spring 9 is formed by laminating a large number of disc springs. Further, the clamp tool 4 has its T leg 11
The T-groove of the fixing base 1 is fitted and fixed, and the mid-height portion 12 of the clamp tool passes through the piston 6 in a slidable manner.

A clamp drive start position adjuster 14 made of an inclined cam is interposed between the output portion 6a of the histone 6 and the input portion /Ia of the clamp tool 4. This clamp drive start position adjuster 14 is pressed toward the 1st wall 7a of the unclamp hydraulic oil chamber 7 by the clamp body return means consisting of a pressing spring 15, and by the fluid pressure controlled operating device 1. ,
From the retreat position Y (see FIG. 1(a)) where the clamp tool input portion 4a is retracted toward the unclamping side with respect to the piston output portion 6a, to the advance position X (see FIG. 1(a)) where the clamp tool input portion 4a is advanced toward the clamp side.
(See b)).

Fluid pressure supply/discharge port I of the fluid pressure working chamber 7 for unclamping]
As shown in FIG. 1, is selectively connected to a hydraulic source S or an oil tank T at an oil supply/discharge well (2).

In the unclamping operating state A shown in FIG. 1(a), first, the fluid pressure supplied from the fluid pressure supply υ10P
The piston 6 is driven to unclamp downward with respect to the clamp body 3 to release the connection between the piston output section 6a and the clamp tool input section 4a, and then the fluid pressure controlled operating device 17 is used to adjust the clamp drive start position. By driving the tool 1/I backward to the right retreat position Y, the clamp body return means 15 moves the clamp body 3 with respect to the clamp tool 4.
An empty running distance ρ for unclamping is formed between the lower surface of the clamp body 3 and the two surfaces of the workpiece W.

At the initial stage of the clamp operating state C shown in FIG.
7, and is driven forward to the left advancing position X, thereby lowering the clamp body 3 with respect to the clamp tool 4 by an idle distance ρ, and bringing the lower surface of the clamp body 3 into contact with the upper surface of the workpiece W.

At the final stage of the clamp operating state C shown in FIG. Clamp tool input section 6a via 14
transmitted to. As a result, the clamp body 3 and the work W
is pressed and fixed on two sides of the fixing base 1.

”-The fluid pressure controlled operating device 17 operates as follows. In other words, in the unclamp operation state A of FIG. 1(a),
After the 411 pressure in the fluid pressure working chamber 7 starts to unclamp the piston 6 downward, the clamp drive start position adjuster 171 is retreated to the retreat position Y, while the clamp drive start position adjuster 171 is moved back to the retreat position Y.
In the clamp operating state C, the clamp drive start position adjuster 1/I is advanced to the advanced position X side before clamping the clamp spring 9 or the piston 6 in two directions. Hereinafter, the above fluid pressure controlled operating device 17 will be explained in detail with reference to FIGS. 2 to 4.

This allows the clamp drive start position adjuster 14 to be adjusted to the single-acting type 4.
The adjuster retracting piston 21 of the 11-pressure linter 20 is configured to be able to be driven backward to the retracted position Y, and the adjuster advancing pressure springs 22, 22 can be driven to be advanced to the advanced position X. An operating chamber 24 for moving the adjusting tool forward is formed on the left side of the adjusting tool advancing piston 21 in FIG. And the hydraulic oil chamber 2 for retracting the adjuster.
4, the clamp drive start position adjuster 14 is pushed to the retract position Y via the adjuster retracting piston 21 and piston rod 26, and the return spring 25 returns the adjuster retracting piston 21. ing. In addition, the hydraulic fluid chamber 24 for retracting the adjustment tool is connected to the fluid pressure supply/discharge port P.
・Communicates with the unclamping fluid pressure chamber 7 via the check valve seat 28 and the check valve chamber 29 in this order. The check valve body 30 in the check valve chamber 29 is brought into close contact with the check valve seat 28 by a valve closing spring 31, and the hydraulic oil chamber 2 for retracting the regulator is connected to the check valve body 30.
The valve opening operating tool 32 is opposed from the 4th side. This valve opening operating tool 32 is fixed to the adjusting tool retraction piston 21.

In the unclamping operating state A, first pressurized oil is injected into the hydraulic oil chamber 24 for retracting the adjuster, and the check valve body 30 is pushed open by the hydraulic pressure J to prevent the hydraulic oil chamber 24 for retracting the adjuster.
4 is communicated with the unclamping fluid pressure operating chamber 7, and the piston 6 is unclamped downward against the clamp spring 9. Subsequently, the clamp drive start position adjustment tool 14 is adjusted using the adjustment tool retraction piston 21 and the piston rod 26.
is suppressed and driven to the backward position Y (see FIG. 1(a)).

On the other hand, in the clamp operating state C, at the beginning of discharging the pressure oil from the fluid pressure supply/discharge port P, the pressure in the hydraulic oil chamber 24 for retracting the adjuster decreases and the check valve body 30 is kept in a closed state. The hydraulic pressure in the unclamping fluid pressure working chamber 7 is maintained at the clamping pressure. On the other hand, in the latter stage of the extraction of pressure oil from the fluid pressure supply JIJI port P, the piston 21 for retracting the regulator returns to the hydraulic oil chamber 24 side for retracting the first joint via the valve opening operating tool 32. The check valve body 30 is opened. As a result, the pressure oil in the unclamping fluid pressure working chamber 7 is discharged from the fluid pressure supply υ10P (see FIG. 1(b)), and the clamping tool 4 is clamped upward by the piston 6 or the clamping spring 9. (See Figure 1(c)).

FIGS. 6 to 8 each show other embodiments, and explanations will be given of configurations different from the first embodiment.

Note that members having the same functions as those in the first embodiment are given the same reference numerals.

(Second Embodiment) FIG. 6 shows a second embodiment, in which a clamp body 3 is fixed to the upper surface of a fixed base 1, and a clamping tool 4 is mounted between the clamp body 3 and the fixed base 1. penetrated in the direction. Then, by clamping the clamp input part 4a formed on the upper part of the clamp tool 4 upward through the piston output part 6a via the clamp drive start position adjustment tool 14 and the pressing tool 41, it can be freely attached to and detached from the leg screw part 42. The workpiece W is pressed and fixed to the lower surface of the fixing table 1 with a nut 43 that has been removed.

(Third Embodiment) FIG. 7 shows a third embodiment, in which a midway portion of a swing type clamp tool 4 is pivotably supported on the top of a clamp body 3 placed on the top surface of a fixed base 1 so as to be able to swing vertically. A clamp tool input section /la is formed at the right swing end in the figure, and a clamp tool output section 4b is formed at the left swing end. Then, by clamping the clamping tool input section 4a upward with the piston output section 6a via the clamp drive start position adjusting tool 14 and the pressing tool 45, the workpiece W is moved onto the "2" side of the fixing table 1 using the clamping tool output section 4b. It suppresses and fixes it on the surface.

In addition, when the piston 6 returns, the clamp tool 4
The clamp tool is driven to be unclamped by a return spring 46.

(Fourth Embodiment) FIG. 8 shows a fourth embodiment, which is partially modified from the one shown in FIG. 7 as follows.

That is, the clamp start position adjustment tool 14, which is placed on the upper left surface 3a of the clamp body 3 so as to be slidable in the left-right direction, is directly driven to clamp the clamp tool input section 71a. In the unclamp operating state A, pressurized oil is supplied from the fluid pressure supply/discharge port P, and the screw output part 6a is moved in and out from the left side 3a of the clamp body 3, and the clamp drive start position is adjusted. The tool 14 is retracted to the retracted position Y using the adjustment tool retracting piston 21 and the piston rod 50. On the other hand, the pressure oil from the fluid pressure supply lJl:l is discharged, and the clamp drive amount starting position adjuster 1/l is advanced by the adjustment tool advancing press spring 22, and the piston output portion 6a is A clamp drive start position adjusting tool 1 protrudes from the upper surface 3a of the clamp body.
4, the clamping tool 4 is driven toward the clamp side.

In addition, in each of the embodiments described in Section 2, the working fluid is at a pressure of AJ1
Alternatively, the working fluid may be a gas such as air.

Furthermore, instead of the disc spring, the clamp spring 9 may be made of a highly compressible material such as an elastic body such as a comb, a sealed liquid such as silicone oil, or a sealed gas.

[Brief explanation of the drawing]

1 to 8 show embodiments of the invention. Figures 1 to 5 show the first embodiment, Figure 1 is an explanatory diagram of the operation of the clamp, Figure 1 (a) is a diagram showing the unclamp operation state, and Figure 1 (b) is a diagram showing the clamp operation. Figure 1 (C
) is a diagram showing the final state of clamp operation, Figure 2 is a longitudinal sectional view of the hydraulic pressure return type spring clamp, and Figure 3 is a diagram showing the [-
4 is a sectional view taken along the line IV-IV in FIG. 2, and FIG.
Figure (a) is a diagram showing the relationship between spring force and spring compression amount, Figure 5 (b) is a diagram showing changes in spring length, Figure 5 (C)
are diagrams showing changes in the state of the clamp, (c) Figure (1) is a diagram showing the unclamp operating state, (C) Figure (2) is a diagram showing the thick wall clamp operating state, (C) Figure (3) FIG. 2 is a diagram showing a thin-walled clamp operating state. 6 to 8 show other embodiments, FIG. 6 is a diagram equivalent to FIG. 2 showing the second embodiment, FIG. 7 is a diagram equivalent to FIG. 2 showing the third embodiment, and FIG. 2 is a diagram corresponding to FIG. 2 showing the fourth embodiment. 9 to 11 show conventional examples. Figure 9 is a diagram equivalent to Figure 2, Figure 10 is a diagram equivalent to Figure 1, Figure 10 (a) is a diagram showing the unclamping operating state, Figure 1
Figure 0(b) is a diagram showing the clamp operating state, Figure 11 is a diagram equivalent to Figure 5, Figure 11(a) is a diagram equivalent to Figure 5(a), and Figure 11(b) is a diagram equivalent to Figure 5(a).
is a diagram equivalent to Figure 5(b), and Figure 11(C) is equivalent to Figure 5(C).
This is a corresponding diagram. 3. Clamp body, 4. Clamp tool, 4a. Clamp tool input part, 6. Piston, 6a. Piston output part, 7. Fluid pressure working chamber for unclamping, 9. Clamp spring, 14. Clamp. Drive start position adjuster, 17.
・Fluid pressure control type operating device, A... Unclamp operating state, C... Clamp operating state, P ・Fluid pressure supply/exhaust port, X...
...Advance position, Y/retreat position. Patent applicant: Cosmec Co., Ltd.-23=

Claims (1)

[Claims] 1. A piston (6) is inserted into the clamp body (3) so as to be slidable vertically and securely, and a fluid pressure operating chamber (7) for unclamping is formed on one side of the piston (6). At the same time, a clamp spring (9) is attached to the other side of the piston (6), and a fluid pressure operating chamber for unclamping (
7) Unclamping operating state (A) supplying working fluid to
Now, use that fluid pressure to move the piston (6) to the clamp body (3).
) against the spring force of the clamp spring (9) to drive the clamping tool (4) interlockingly connected to the piston (6) toward the unclamping side, and fluid pressure is supplied. From the discharge port (P) to the fluid pressure operating chamber for unclamping (
In the clamp operating state (C) in which the working fluid in the clamp body (7) is discharged, the piston (6) is driven forward and backward with respect to the clamp body (3) by the spring force of the clamp spring (9), and the clamp tool (
4) in a fluid pressure return type spring clamp configured to drive the clamp toward the clamp side, there is a clamp drive start position between the output part (6a) of the piston (6) and the input part (4a) of the clamp tool (4). Adjustment tool (
14), and a clamp drive start position adjuster (14)
is a fluid pressure-controlled operating device (17), which moves from a retreat position (Y) in which the clamp tool input portion (4a) is retracted toward the unclamping side relative to the piston output portion (6a) to an advanced position (X) in which it is advanced toward the clamping side. ), and in the unclamping state (A), the fluid pressure in the fluid pressure operating chamber (7) unclamps the piston (6). After the clamp drive start position adjuster (14) is moved back to the retracted position (Y), the clamp drive start position adjuster (14) is moved back to the retracted position (Y). A fluid pressure return type spring clamp characterized in that a drive start position adjuster (14) is configured to advance toward an advanced position (X).