JP2002079433A - Work support - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work support capable of eliminating the negative pressure in an oil chamber communicated to an outer peripheral side hydraulic chamber, and having a supporting function of high reliability. SOLUTION: A pressurized air supplying mechanism 6 is mounted for supplying the pressurized air to an air passage 41, a pressure intensifying piston member 10 has a block structure divided in the transverse direction, and plural groove parts 54 for the air passage, connecting from pressurized air supplying mechanism 6 to the air passage 41 are formed on a lower face of a first piston member 52 of the pressure intensifying piston member 10, whereby only a second piston member 53 of the pressure intensifying piston member 10 is forcibly driven by the pressurized air, and then the first piston member 52 is downwardly moved by the elastic returning of a sleeve body, in downwardly moving the pressure intensifying piston member 10, to eliminate the negative pressure of an annular oil chamber 57 communicated to the outer peripheral side hydraulic chamber 39, and to prevent the intrusion of the air and the pressurized air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work support that locks a rod by elastically deforming an elastically deformable sleeve body with hydraulic pressure, and more particularly to a work support having a highly reliable support function.

[0002]

2. Description of the Related Art Conventionally, when a work is fixed to a work pallet or the like and subjected to machining, the machining accuracy is reduced due to elastic deformation or chatter vibration of the work. Therefore, a work support for receiving a workpiece to be machined from the side opposite to the machining side has been put to practical use. The applicant of the present invention has proposed and applied for various work supports (also referred to as hydraulic lock devices), and in particular, has proposed and put into practical use a work support with a simplified structure (Japanese Utility Model Laid-Open No. 59-128902; See JP-A-6-47710). These work supports have a structure in which a sleeve body integral with or separate from the piston member is elastically deformed to the diameter reducing side by hydraulic pressure, and the rod is locked by the static friction force acting between the sleeve body and the rod.

In the case of this structure, if the hydraulic pressure for elastically deforming the sleeve is low, the locking force will be small. Generating a large locking force requires a large work support, which is disadvantageous in terms of equipment costs. Alternatively, it is necessary to supply high pressure hydraulic pressure from a hydraulic pressure source,
Hydraulic supply source becomes large and hydraulic leaks easily occur,
It will be expensive.

Accordingly, the inventor of the present application has been developing a work support that locks a rod with pressurized air while miniaturizing and increasing the output of the work support. In this work support, oil is previously sealed in an outer peripheral hydraulic chamber formed on the outer peripheral side of the sleeve body and an annular oil chamber communicating with the outer peripheral hydraulic chamber, and the oil is supplied to the pressure-intensifying piston by pressurized air. Pressure is applied via a member.

When the work is supported by the work support, the work is set, fixed by another clamping device or the like, and then pressurized air is supplied from a pressurized air supply source to the air input port. Then, the piston member moves upward against the urging force of the compression coil spring that returns the rod, and the rod moves upward by the urging force of the compression coil spring that drives the rod.

After the output portion at the tip of the rod lightly abuts the work with a weak force, pressurized air is supplied to the air working chamber below the pressure-intensifying piston member, and the pressure-increasing piston member slides upward. Drive. As a result, the oil in the outer peripheral hydraulic chamber is pressurized, the thin cylindrical portion of the sleeve body is elastically deformed to the reduced diameter side, and is firmly pressed against the rod to lock the rod, and the work is received by the rod. Supported.

When returning the rod, the supply of pressurized air to the lower air working chamber and the air input port communicating with the piston member is stopped, and the upper air working chamber of the pressure increasing piston member is stopped. And pressurized air is supplied to the piston to slidably drive the pressure-intensifying piston member downward. Thereafter, the piston member retreats by the urging force of the compression coil spring, and the rod returns to the retreat side.

[0008]

In the conventional work support that locks a rod with pressurized air, when the rod is returned and moved, the pressure-intensifying piston member is forcibly slidably driven downward by pressurized air. Thus, the annular oil chamber on the inner peripheral side of the pressure-intensifying piston member becomes negative pressure. As a result, air or pressurized air enters the annular oil chamber and the outer peripheral hydraulic chamber. When the compressible gas enters the outer peripheral hydraulic chamber, the hydraulic pressure does not rise, the frictional force between the rod and the sleeve body is reduced, and the support function of the work support is reduced.

An object of the present invention is to provide a work support having a highly reliable support function by eliminating negative pressure in an oil chamber communicating with an outer peripheral hydraulic chamber.

[0010]

According to a first aspect of the present invention, there is provided a work support comprising: a rod; a sleeve member which is externally fitted to the rod and is elastically deformable to a reduced diameter side; a case member which supports the sleeve member; A workpiece that has a scraper that is externally fitted to the tip of the case member and scrapes off extraneous matter on the outer peripheral surface of the rod when the rod returns, and an outer peripheral hydraulic chamber that is formed on the outer peripheral side of the sleeve body. In the support, pressure-intensifying pressurizing means for pressurizing oil filled in the outer peripheral side hydraulic chamber with pressurized air via a pressure-increasing piston member,
An air passage formed between the rod and the inner peripheral surface of the sleeve body, the air passage communicating with the gap between the rod and the scraper, and pressurized air supply means for supplying pressurized air to the air passage. Comprising a dividing structure in which the pressure-intensifying piston member is divided transversely, and at least one of the divided surfaces of the pressure-increasing piston member has a plurality of grooves for an air passage communicating from the pressurized air supply means to the air passage. It is characterized by having been formed.

When a workpiece to be machined is received and supported by the workpiece support, the workpiece is set from above the workpiece support and fixed by a separately provided clamping device or the like. Then, the rod is advanced and the output portion at the tip of the rod is lightly abutted against the work with a very weak force, and then the pressure-increasing piston member of the pressure-increasing pressurizing means is slidably driven. As a result, the oil in the outer peripheral side hydraulic chamber is pressurized, the sleeve body is elastically deformed to the reduced diameter side, and is firmly pressed against the rod to lock the rod, and the work is received and supported by the rod.

When returning the rod, the drive of the pressure-increasing pressurizing means is stopped, and pressurized air is supplied to the air passage through a plurality of grooves by the pressurized air supply means. Spout from the gap. By the pressurized air, the input-side split body of the pressure-intensifying piston member is separated from the output-side split body and slidably driven, the output-side split body moves with a slight delay, and the oil in the outer hydraulic chamber is reduced in pressure. . Then, after releasing the locked state of the rod, the rod returns to the retreating side.

According to a second aspect of the present invention, there is provided a work support comprising: a rod;
In a work support provided with a sleeve body fitted to the rod and elastically deformable to a reduced diameter side, a case member supporting the sleeve body, and an outer peripheral hydraulic chamber formed on the outer peripheral side of the sleeve body. A pressure-intensifying pressurizing means for pressurizing the oil filled in the outer peripheral-side hydraulic chamber through a pressure-intensifying piston member by pressurized air, and a base end portion of the rod to urge the rod toward the advance side. A pressure receiving chamber for receiving pressurized air, and pressurized air supply means for supplying pressurized air to the pressure receiving chamber; A plurality of grooves for an air passage leading from the pressurized air supply means to the pressure receiving chamber are formed on at least one of the divided surfaces.

When a workpiece to be machined is received and supported by the workpiece support, the workpiece is set from above the workpiece support and fixed by a separately provided clamping device or the like. Next, when pressurized air is supplied to the pressure receiving chamber through the plurality of grooves by the pressurized air supply means,
The rod moves upward and the output portion at the tip of the rod lightly abuts the work with a very weak force.

Next, when the pressure-intensifying piston member of the pressure-intensifying and pressurizing means is slid and driven in the same manner as described above, the oil in the outer peripheral hydraulic chamber is pressurized, and the sleeve body is elastically deformed to the reduced diameter side and the rod body is deformed. The rod is firmly pressed against the rod to lock it, and the work is received and supported by the rod. When the rod is returned, when the drive of the pressure-intensifying and pressurizing means is stopped, the input side divided body of the pressure-intensifying piston member is separated from the output-side divided body and slidably driven by the pressurized air. The output side split body moves with a delay. As a result, the pressure of the oil in the outer hydraulic chamber is reduced, and after the locked state of the rod is released, the rod returns to the retreating side.

According to a third aspect of the present invention, there is provided a work support according to the first or second aspect, wherein air working chambers are respectively formed on upper and lower sides of a pressure-intensifying piston member of the pressure-increasing pressurizing means. . By supplying pressurized air to the lower air working chamber, the input-side split body and the output-side split body of the pressure-increasing piston member are integrally driven upward, and the oil in the outer hydraulic chamber is pressurized.

According to a fourth aspect of the present invention, in the invention of the third aspect, the pressure-intensifying and pressurizing means has an annular oil chamber communicating with an inner-peripheral-side hydraulic chamber on the inner peripheral side of the pressure-increasing piston member. It is a feature. Therefore, the pressure of the annular oil chamber is increased or decreased by slidingly driving the pressure-intensifying piston member, and the hydraulic pressure of the outer peripheral hydraulic chamber is controlled.

According to a fifth aspect of the present invention, there is provided the work support according to the first aspect of the invention, further comprising a compression coil spring for driving the rod to advance. After releasing the mechanism for restricting the rod from moving toward the workpiece, the rod is driven upward by the urging force of the compression coil spring.

According to a sixth aspect of the present invention, there is provided a work support according to the first or second aspect of the invention, further comprising a coil spring for returning the rod. After the pressure of the oil in the outer peripheral hydraulic chamber is reduced by sliding the pressure-increasing piston member, the rod is returned to the retreating side by the urging force of the coil spring.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the work support 1 of the present embodiment is for supporting a central portion of a workpiece 2 to be machined from below to prevent elastic deformation and vibration of the workpiece 2. As shown in FIGS. 2 to 4, the work support 1 includes a substantially cylindrical case member 3,
A rod 4, an air cylinder 5 for driving the rod 4,
A pressurized air supply mechanism 6, compression coil springs 7 and 8, a sleeve body 9 slidably fitted on the rod 4, and a pressurizing pressurizing unit that pressurizes oil by pressurized air via a pressurizing piston member 10. It has a pressure mechanism 11 and the like.

First, the case member 3 will be described. As shown in FIGS. 2 to 4, the case member 3 is for mounting and supporting the rod 4 and the sleeve body 9, and includes an outer case 12, a bottom case 13, and an inner case 14 open at both ends. Etc. A bottom case 13 is internally screwed into a lower end portion of the outer case 12, and air input ports 15, 16, and 17 are formed in the bottom case 13. An inner case 14 is provided at the upper end of the outer case 12.
The inner case 14 has an inner peripheral side formed with a sleeve housing hole 18 and a scraper 19 and seal members 20 and 21 mounted thereon.

The scraper 19 made of synthetic resin is
A sharp tip portion 19a is formed so as to be externally fitted to the upper end wall portion of the inner case 14 and to scrape off the attached matter on the outer peripheral surface of the rod 4 when the rod 4 returns. The large-diameter portion 26 and the small-diameter portion 27 in the lower half of the inner case 14 are formed on the same axis. A plurality of horizontal communication passages 28 are formed in the wall near the step between the large-diameter portion 26 and the small-diameter portion 27, and a part of the pressure-intensifying piston member 10 is formed in the large-diameter portion 26 and the small-diameter portion 27. It is slidably fitted outside. The seal members 25a, 25b, 25c are also mounted.

Next, the rod 4 will be described. Figure 2
As shown in FIG. 4, the rod 4 is slidably inserted into the sleeve body 9, and a cylindrical hole 29 having a length of about ／ of the entire length of the rod 4 is formed in the lower half of the rod 4 from the lower end. A cylindrical hole 31 having a smaller diameter than the cylindrical hole 29 is formed with the intermediate wall portion 30 interposed therebetween. The cylinder body 32 of the air cylinder 5 is fitted in the cylindrical hole 29, and the rod 4 is guided by the sleeve body 9 and the cylinder body 32 so as to be vertically slidable. An output unit 33 is screwed and fixed to the upper end of the rod 4.
Abut.

Next, the sleeve body 9 will be described. The sleeve body 9 is composed of an outer metal outer sleeve 34 and an inner synthetic resin inner sleeve 35, and the inner sleeve 35 is slidably fitted to the rod 4 with little clearance. A fixing ring upper portion 36, a thin-walled tube portion 37, and a fixing ring lower portion 38 are formed in the outer sleeve 34 in order from the upper portion to the lower portion.
6, the thin cylindrical portion 37 and the lower portion of the fixing ring 38 are integrally formed.

The upper portion 36 of the fixing ring is engaged with the upper end wall of the inner case 14 from above, and the upper end of the inner sleeve 35 is engaged with the scraper 19 from above. A lower fixing ring 38 is integrally engaged with a flange 35 a formed at a lower end portion of the inner sleeve 35, and the flange 35 a and the lower fixing ring 38 are connected to the inner case 14.
And the air cylinder 5 and are fixed. The thin cylindrical portion 37 is configured to be elastically deformable toward the diameter reduction side, and an annular outer hydraulic chamber 39 is provided on the outer peripheral side of the thin cylindrical portion 37.
Are formed. The outer side hydraulic chamber 39 contains oil filled from a plurality of filling ports 40 formed in the upper wall of the inner case 14.

An air passage 41 is formed between the rod 4 and the inner peripheral surface of the inner sleeve 35, and a pressure (for example, 0.02 MPa) higher than the contact pressure of the scraper 19 is applied from the air input port 17 to the air passage 41. The pressurized air is supplied, and the pressurized air is supplied to the minute gap δ between the rod 4 and the scraper 19 through the air passage 41 to be ejected to the outside.

Next, the air cylinder 5 will be described. The air cylinder 5 has a cylinder body 32 and a piston member 42 as shown in FIGS. A flange 43 is provided in the middle of the outer circumference of the cylinder body 32 in the longitudinal direction.
Is formed, and the flange portion 43 is screwed into the lower end portion of the inner case 14. A plurality of vertical communication passages 4 for guiding pressurized air supplied to the air working chamber 44 a by the pressurized air supply mechanism 6 to the air passage 41 are provided in the flange portion 43.
3a are formed.

The cylinder body 32 is formed with a cylinder hole 45 also serving as a spring receiving hole, and a piston member 42 is slidably mounted in the cylinder hole 45. An opening 47 is formed in the upper wall 46 of the upper end of the cylinder body 32. The air working chamber 48 of the air cylinder 5 is defined by the inner peripheral surface of the cylinder hole 45, the piston member 42, and the bottom case 13. The pressurized air is supplied to 48 to drive the piston member 42 to slide upward. still,
A seal member 49 is also provided.

Next, the compression coil spring 7 for returning the piston member 42 and the rod 4 to the lower position will be described. A compression coil spring 7 that elastically urges the piston member 42 and the rod 4 downward is accommodated in the cylinder hole 45.
The lower end of the compression coil spring 7 is received by the piston member 42, and the upper end of the compression coil spring 7 is received by the upper wall 46. When the air cylinder 5 shown in FIG.
And the rod 4 are returned downward.

Next, the piston rod 50, the shaft member 51,
The compression coil spring 8 will be described. Piston member 42
, An upright piston rod 50 is integrally connected,
The piston rod 50 includes a large diameter portion 50a and a small diameter portion 50b, and a shaft member 51 with a flange is screwed to an upper end of the small diameter portion 50b. The small diameter portion 50b is the upper wall portion 46
The shaft member 51 is inserted into the cylindrical hole 31 on the upper side of the intermediate wall portion 30 so as to be able to move up and down.

An output member in which the lower end of the compression coil spring 8 for driving the rod 4 to advance is received by the flange 51a of the shaft member 51 and the upper end of the compression coil spring 8 is screwed and fixed to the upper end of the rod 4. 33, the rod 4 is elastically urged upward. When supporting the work 2, the rod 4 can be driven upward against the weight of the rod 4 so that the rod 4 comes into contact with the work 2 with a very weak urging force such that the work 2 is hardly elastically deformed. , The urging force of the compression coil spring 8 (that is, the spring length and the spring constant) is set.

Next, the pressure increasing and pressurizing mechanism 11 will be described. As shown in FIG. 2 to FIG. 4, the annular space defined by the outer case 12, the inner case 14, the cylinder body 32, and the bottom case 13 has a pressure-increasing piston member of the pressure-increasing pressure mechanism 11. 10 is provided so as to be able to slide up and down. The pressure-intensifying piston member 10 has a first piston member 52 serving as an upper half portion and a second piston member 53 serving as a lower half portion, and is configured to have a transversely divided structure. An air working chamber 44b is formed on the upper side of
An air working chamber 44c is formed below the pressure-increasing piston member 10.

Of the divided surfaces of the pressure-increasing piston member 10, on the lower surface of the first piston member 52, air flowing from the pressurized air supply source to the air passage 41 via the air working chamber 44a and the plurality of communication passages 43a is provided. A plurality of grooves 54 for the passage are formed. About 2 / upper part on the inner peripheral side of the first piston member 52
The three portions are slidably fitted to the large diameter portion 26 of the inner case 14, the lower approximately 1/3 portion is slidably fitted to the small diameter portion 27 of the inner case 14, and the sealing members 55, 56 are also provided. It is installed. An annular oil chamber 57 communicating with the inner and outer hydraulic chambers 39 of the first piston member 52 via the plurality of communication passages 28 is formed.

The second piston member 53 has a large-diameter portion 58 formed in an upper half portion, and a small-diameter portion 59 formed in a lower half portion and integrally connected to the large-diameter portion 58. Large diameter part 58
Is slidably fitted inside the bottom case 13, and the inner circumferential surface of the small diameter portion 59 is slidably fitted outside the cylinder body 32, and mainly includes the cylinder body 32 and the second piston member 53. Defines an air working chamber 44a. Seal members 60 and 61 are also provided. The volume of the annular oil chamber 57 is reduced by supplying pressurized air from the pressurized air supply source to the air input port 16 and integrally driving the first and second piston members 52 and 53 upward. The oil in the chamber 39 is pressurized.

Next, the pressurized air supply mechanism 6 will be described. The pressurized air supply mechanism 6 that supplies pressurized air to the air passage 41 includes a pressurized air supply source, the air input port 17,
It comprises a plurality of passages 62, 63, 64, a groove 54, an air passage 41 and the like. In the bottom case 13, an oblique passage 62, which extends upward from the air input port 17, an annular passage 63, and a groove-like passage 64 partially formed in a screw portion of the bottom case 13 are formed. Pressurized air is supplied from the pressurized air supply source to the air input port 17, passes through the oblique passage 62, the annular passage 63, the grooved passage 64, passes through the plurality of grooves 54, and flows through the plurality of communication passages 43 a. Passage 4
1 is supplied.

Next, the operation of the work support 1 will be described. When a workpiece 2 to be machined is received and supported by one or more workpiece supports 1 from below, as shown in FIG. 1, the workpiece 2 is set from above the workpiece support 1 and a plurality of clamping devices (not shown) are set. Then, pressurized air is supplied from a pressurized air supply source through the air input port 15 to the air working chamber 4.
8 to drive the air cylinder 5.

Then, as shown in FIG. 2, the piston member 42, the piston rod 50, and the shaft member 51 are slid upwardly against the urging force of the compression coil spring 7, and the compression coil spring 8 contracts. The urging force is slightly increased, and the rod 4 moves upward by the weak urging force of the compression coil spring 8.
After the output member 33 of the rod 4 is lightly abutted against the workpiece 2 with a weak force and the rod 4 is stopped, the pressure increasing pressure mechanism 11
Is driven to slide.

That is, as shown in FIG. 3, pressurized air is supplied to the air input port 16 from a pressurized air supply source,
The piston members 52 and 53 are integrally driven upward to reduce the volume of the annular oil chamber 57. As a result, the oil in the outer peripheral side hydraulic chamber 39 is pressurized, and the thin cylindrical portion 37 of the outer sleeve 34 is elastically deformed toward the reduced diameter side, and the inner sleeve 35 is firmly pressed against the rod 4 to lock the rod 4. The work 2 is received and supported by the rod 4. In this manner, with the work 2 supported by one or a plurality of work supports 1, the clamping device is operated as required to clamp the work 2, and machining is performed in that state.

When the rod 4 is returned after the work 2 is completed, as shown in FIG.
Then, the driving of the pressure increasing and pressurizing mechanism 11 is stopped, and the pressurized air supply mechanism 6 is driven. That is, the direction switching valve is switched to introduce the pressurized air supplied from the pressurized air supply source into the air input port 17. Then, pressurized air having a pressure equal to or higher than the contact pressure of the scraper 19 (e.g.
2. Through the annular passage 63, the grooved passage 64, and the plurality of grooves 54, the air is supplied to the air passage 41 through the air working chamber 44a and the plurality of communication passages 43a, and is ejected from the minute gap δ between the rod 4 and the scraper 19. Let it.

When the rod 4 returns, the scraper 19
Cutting oil, fine chips,
Most of the deposits such as dust are scraped off, and the deposits that have been scraped off and separated from the surface of the rod 4 form fine gaps δ.
Is reliably blown off by the pressurized air jet 65 ejected from the nozzle.

The pressurized air causes the second piston member 53 to separate from the first piston member 52 and to slide downward, and with a slight delay, the first piston member 52 moves downward by the elastic return of the sleeve body 9. Go to This allows
The volume of the annular oil chamber 57 increases, and the hydraulic pressure of the outer hydraulic chamber 39 decreases. After the lock state of the rod 4 by the sleeve body 9 is released, the piston member 42, the piston rod 50, and the shaft member 51 move downward by the urging force of the compression coil spring 7, and the flange 51 a contacts the intermediate wall portion 30. As shown in FIG. 2, the rod 4 also returns downward in conjunction with the downward return movement of the shaft member 51.

In the work support 1 described above, the pressure-intensifying piston member 10 is constructed in a divided structure in which the pressure-increasing piston member 10 is divided transversely. Since the plurality of grooves 54 for the passage are formed, when the pressure-intensifying piston member 10 is slid downward, first, the second piston member 53
Only the first piston member 52 is forcibly driven to slide by the pressurized air, and then the first piston member 52 is returned downward.

Therefore, the annular oil chamber 57 does not become a negative pressure, and it is possible to prevent air and pressurized air from entering the annular oil chamber 57 and the outer peripheral hydraulic chamber 39. in this way,
Since no compressive gas enters the outer peripheral side hydraulic chamber 39, the oil in the outer peripheral side hydraulic chamber 39 can be reliably pressurized, and the rod 4 can be securely locked to support the work 2. Further, since the rod 4 and the pressure-intensifying piston member 10 can be driven only by the pressurized air and the compression coil springs 7, 8, a hydraulic supply unit is not required, and the equipment cost can be reduced.

Next, a modified embodiment in which this embodiment is partially modified will be described. However, the same members as those in the above-described embodiment are denoted by the same reference numerals, and the description will be appropriately omitted. 1] As shown in FIG. 5, in the work support 1A according to the modified embodiment, an annular pressure receiving chamber 70 for receiving pressurized air is formed at a base end portion of the rod 4 in order to urge the rod 4 toward the advance side. The pressure receiving chamber 70 is defined by the lower half of the rod 4, the sleeve body 9, and a substantially cylindrical rod support member 71. A pressurized air supply mechanism 72 that supplies pressurized air to the pressure receiving chamber 70 is also provided.

A flange 73 is formed at the lower end of the rod support member 71, and the flange 73 is screwed into the lower end of the inner case 14. The flange portion 73 is formed with a plurality of vertical communication passages 73a for guiding the pressurized air supplied from the pressurized air supply mechanism 72 to the air operating chamber 44a to the pressure receiving chamber 70. A piston receiving hole 74 is formed in the rod support member 71, and the second piston member 53A
The center shaft 75 is supported so as to be vertically slidable.

A shaft 77 is formed integrally with the upper end of the rod supporting member 71 via a tapered portion 76.
A shaft member 51 is screwed to the upper end of the shaft. A part of the shaft portion 77 extends through the center hole of the intermediate wall portion 30 into the cylindrical hole 31, and the shaft member 51 is inserted into the cylindrical hole 31. The lower end of the compression coil spring 78 for returning the rod is fixed to the flange 51a of the shaft member 51, the upper end of the compression coil spring 78 is fixed to the output member 33 of the rod 4, and the rod 4 is elastically moved downward. I'm going.

When the work 2 is supported by the work support 1A, similarly to the above-described embodiment, the work support 1A is used.
After setting the work 2 from above A and fixing it with the clamp device, pressurized air is supplied to the air input port 17 to
Pressure on the base end side of As a result, the rod 4 moves upward against the urging force of the compression coil spring 78 for returning the rod 4, and the output portion 33 at the tip of the rod 4 lightly contacts the work 2 with a weak force.

Next, pressurized air is supplied from a pressurized air supply source to the air input port 16, and the first and second piston members 52,
The volume of the annular oil chamber 57 is reduced by integrally sliding and driving the 53A upward, and thereafter, after the work 2 is fixed in the same manner as in the above embodiment, machining is performed. At this time, the pressurized air is supplied to the oblique passage 62, the annular passage 63, the groove-like passage 64,
By supplying the air to the air passage 41 through the plurality of grooves 54 through the air working chamber 44a and the plurality of communication passages 43a, and ejecting the air from the minute gap δ between the rod 4 and the scraper 19,
Cutting oil, minute chips, dust and the like can be prevented from entering between the rod 4 and the sleeve body 9.

When the rod 4 is returned, the driving of the pressure-increasing pressure mechanism 11 is stopped.
Pressurized air supplied from the second piston member 53
A separates from the first piston member 52 and slides downward, and the first piston member 52 moves downward with a slight delay due to the elastic return of the sleeve body 9. After the lock state of the rod 4 by the sleeve body 9 is released, the compression coil spring 7
The urging force of 8 causes the rod 4 to return downward. Therefore,
It has substantially the same effect as the above embodiment.

2) A plurality of grooves for an air passage can also be formed on the upper surface of the second piston member, and a plurality of grooves are formed only in one of the first piston member and the second piston member. There may be. 3) The sleeve body may be a single metal sleeve body without the synthetic resin inner sleeve. In addition, various modifications can be made to the above embodiments without departing from the spirit of the present invention.

[0051]

According to the first aspect of the present invention, the pressure-intensifying piston member is configured to have a divided structure in which the pressure-increasing piston member is divided transversely, and at least one of the divided surfaces of the pressure-increasing piston member is provided with the air passage from the pressurized air supply means. When the rod is moved back, first, only the input-side split body of the pressure-intensifying piston member is forcibly driven to slide by pressurized air, and then the pressure is increased. The output-side split body of the piston member moves downward due to the elastic return of the sleeve body.

Therefore, the oil chamber communicating with the outer peripheral hydraulic chamber does not become negative pressure, and it is possible to prevent air or pressurized air from entering the outer hydraulic chamber. As described above, since the compressive gas does not enter the outer peripheral hydraulic chamber, the oil in the outer hydraulic chamber can be reliably pressurized, and the rod can be securely locked to support the work.

According to the second aspect of the present invention, the pressure receiving chamber for receiving the pressurized air is provided at the base end portion of the rod, and the pressurized air supply means is provided. Although the mechanism for urging the pressure is limited, the divided structure of the pressure-intensifying piston member and the plurality of grooves for the air passage are basically the same configuration, so that substantially the same effects as those of the first aspect are achieved.

According to the third aspect of the present invention, by supplying pressurized air to the lower air working chamber, the output-side split body and the input-side split body of the pressure-intensifying piston member are driven integrally, and The oil in the side hydraulic chamber can be pressurized. The other effects are the same as those of the first or second aspect. According to the fourth aspect of the present invention, the volume of the annular oil chamber is increased or decreased by sliding the pressure-intensifying piston member, so that the hydraulic pressure of the outer hydraulic chamber can be easily controlled. The other effects are the same as those of the third aspect.

According to the fifth aspect of the present invention, since the compression coil spring for driving the rod to advance is provided, the mechanism for restricting the rod from moving toward the workpiece is released, and then the rod is moved by the urging force of the compression coil spring. It can be driven forward.
The other effects are the same as those of the first aspect. According to the invention of claim 6, since the coil spring for returning the rod is provided, the pressure of the oil in the outer hydraulic chamber is reduced by driving the pressure-intensifying piston member to slide, and then the rod is biased by the urging force of the coil spring. It can return to the exit side. The other effects are the same as those of the first or second aspect.

[Brief description of the drawings]

FIG. 1 is a front view of a cutaway main part of a work support and a work according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a work support (during a rod return operation).

FIG. 3 is a longitudinal sectional view of a work support (in a locked state of a rod).

FIG. 4 is a longitudinal sectional view of a work support (unlocked state of a rod).

FIG. 5 is a modified form of work support (work contact state).
FIG.

[Explanation of symbols]

 1, 1A Work support 3 Case member 4 Rod 6 Pressurized air supply mechanism 7, 8 Compression coil spring 9 Sleeve body 10 Booster piston member 11 Booster pressurization mechanism 19 Scraper 39 Outer hydraulic chamber 41 Air passage 44b, 44c Air operation Chamber 54 Groove 57 Annular oil chamber δ Gap 70 Pressure receiving chamber 72 Pressurized air supply mechanism 78 Compression coil spring

Claims (6)

[Claims] 1. A rod, a sleeve body fitted externally to the rod and elastically deformable to a reduced diameter side, a case member supporting the sleeve body, and a case member externally fitted to the rod and held at a distal end of the case member. And a work support including a scraper that scrapes off deposits on the outer peripheral surface of the rod during the return movement of the rod, and an outer peripheral hydraulic chamber formed on the outer peripheral side of the sleeve body, wherein the outer peripheral hydraulic chamber is filled. Pressurizing means for pressurizing the oil with pressurized air via a pressure-increasing piston member; and an air passage formed between the rod and the inner peripheral surface of the sleeve body, wherein a gap between the rod and the scraper is provided. And a pressurized air supply unit for supplying pressurized air to the air passage. The pressurized piston member is configured to have a divided structure that is divided transversely. Little At least on one side,
A work support wherein a plurality of grooves for an air passage leading from the pressurized air supply means to the air passage are formed. 2. A rod, a sleeve member fitted to the rod and elastically deformable to a reduced diameter side, a case member supporting the sleeve member, and an outer hydraulic chamber formed on an outer peripheral side of the sleeve member. And a pressure increasing pressurizing means for pressurizing the oil filled in the outer peripheral side hydraulic chamber with pressurized air via a pressure increasing piston member, and for urging the rod toward the advance side. A pressure receiving chamber for receiving pressurized air at a base end portion of the rod, and pressurized air supply means for supplying pressurized air to the pressure received chamber, wherein the pressure-increasing piston member is divided transversely. And at least one of the divided surfaces of the pressure-intensifying piston member,
A work support wherein a plurality of grooves for an air passage leading from the pressurized air supply means to the pressure receiving chamber are formed. 3. The work support according to claim 1, wherein air working chambers are respectively formed on upper and lower sides of a pressure-intensifying piston member of the pressure-increasing pressurizing means. 4. The work support according to claim 3, wherein the pressure-intensifying and pressurizing means has an annular oil chamber communicating with the hydraulic pressure chamber on the inner peripheral side of the pressure-intensifying piston member. 5. The work support according to claim 1, further comprising a compression coil spring for driving the rod to advance. 6. The work support according to claim 1, wherein a coil spring for returning the rod is provided.