JP2003347799A - Work support apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow a single work support apparatus to support works of a plurality of kinds. <P>SOLUTION: A support stage 10 is provided with a plurality of cylinder chambers 12 which house a piston for reciprocation which is provided with a piston rod 14 contacting a work. The cylinder chamber 12 is partitioned into an advancement air-pressure chamber 16 positioned on the rear end side of a piston 13, and a retreatment air-pressure chamber 18 positioned on the front end side of the piston 13. An advancement flow path 22 is connected to the advancement air-pressure chamber 16 while a retreatment flow path 24 is connected to the retreatment air-pressure chamber 18. When the piston 13 comes to an advancement limit position, a seal member 26 which is an opening/closing member shuts off the retreatment flow path 24. When the piston 13 retreats by prescribed strokes, the retreatment flow path 24 is opened. When opened, the piston 13 is applied with a thrust in retreating direction that is larger than that in advancing direction. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work supporting apparatus for supporting a plate-like work by a plurality of rods, and for example, a work useful when applied to a printed circuit board on which components such as ICs are mounted. It relates to a support device.

[0002]

2. Description of the Related Art When applying cream solder to a printed board or a mounting board, cream solder is applied while a masking plate material on which a pattern to be applied with solder is formed is attached to the mounting board.

When mounting components such as ICs, LSIs, capacitors and resistors on a mounting board such as a printed board, the mounting board is transported to a mounting stage by a conveyor or the like, and mounted on the mounting stage. Various components are automatically mounted on a mounting board by a device or the like. On the mounting stage, after positioning the mounting board at a predetermined position, the transfer head of the mounting device, also called a chip mounter, grabs and mounts components from the component storage section, or vacuum-adsorbs components and transports them to the mounting board. To be mounted.

A work supporting device is provided on such a solder coating stage or a mounting stage to support a mounting substrate. The conventional work supporting apparatus has a plurality of bars which move up and down at the same time, and positions the mounting substrate at a predetermined position by supporting the mounting board with the bars at the lower surface thereof.
Under the positioned state, cream solder is applied on the solder application stage, and components are mounted on the upper surface of the mounting board on the mounting stage.

[0005]

However, there are various types of mounting boards on which components are mounted, and electronic components may be mounted not only on the upper surface of the mounting board but also on both upper and lower surfaces. When electronic components are mounted on both upper and lower sides,
The components are further mounted on the upper surface of the mounting board surface on which the components are mounted on the lower surface. In the solder application stage, cream solder is applied to the upper surface while electronic components are mounted on the lower surface. In such a case, when supporting the mounting board on its lower surface, if the support rod material hits the part of the component already mounted on the lower surface, the support rod material contacts the already mounted component. Parts may be damaged.

Therefore, conventionally, it is necessary to prepare a plurality of types of support devices in accordance with the type of mounting substrate, and it is necessary to mount components on various types of mounting substrates on one mounting stage or solder application stage. Therefore, there are various types of supporting devices to be prepared, and it is necessary to replace the supporting device according to the type of the mounting substrate, or to replace the position of the bar in each case according to the mounting substrate. For this reason, there is a problem that the assembling process of the parts becomes complicated, and the assembling cannot be performed efficiently.

An object of the present invention is to enable a plurality of types of works to be easily supported in a short time by one work support device.

[0008]

According to the present invention, there is provided a work supporting apparatus comprising: a support base having a plurality of cylinder chambers for reciprocally accommodating a piston provided with a piston rod contacting a work; A forward flow path communicating with a forward air pressure chamber on the rear end face side of the piston, a retreat flow path communicating with a backward air pressure chamber on the front end face side of the piston in the cylinder chamber, When the forward limit position is reached, the retreat pneumatic chamber is closed,
An opening / closing member for communicating the retreat pneumatic chamber with the retreat channel when the piston moves backward by a predetermined stroke, and between the open / close member and the piston when the piston is at a forward limit position. A leakage member that leaks air leaking from the outside to the outside, a seal member that closes when the piston moves backward by a predetermined stroke, a forward air pressure control unit that controls forward air pressure that applies forward thrust to the piston, A reverse air pressure control unit that controls a reverse air pressure that applies a thrust in the reverse direction to the piston.

In the present invention, even if air supplied to the retreat passage leaks from between the piston and the opening / closing member when the piston rod is at the forward limit position, the air flows through the leak passage. Since the air is exhausted to the outside, the air pressure from the retreating channel does not act on the retreating air pressure chamber, and when the piston retreats by a predetermined stroke, the leakage path is closed by the seal member, and the retreating air pressure is reduced. The pressure is surely applied to the chamber. Thus, it is possible to prevent the piston rod from retreating carelessly due to variations in the processing accuracy of parts and wear of the seal member due to operation.

The opening / closing member may be formed of a resiliently deformable sealing material which comes into contact with a front end face of the piston when the piston is at a forward limit position, and has a stopper surface which comes into contact with the piston. The stopper may be formed by a stopper attached to the support base and a valve member which is movably mounted in the support base in the axial direction and contacts the piston until the piston retreats from the forward limit position by a predetermined stroke. Further, the opening and closing member is formed by a stopper having a stopper surface that contacts the piston and a seal surface that contacts the seal member provided on the piston until the piston retreats by a predetermined stroke from a forward limit position. Is also good.

In the work supporting device of the present invention, when the piston is at the retreat limit position, a flow path opening / closing member that shuts off the forward pneumatic chamber and the forward flow path, and reduces the pressure of the retreat pneumatic chamber. And a spring member for moving the piston to a position at which the forward air pressure chamber and the forward flow path communicate with each other.

In the present invention, when the piston is in the retreat limit position, the flow opening / closing member prevents the air from the forward flow channel from flowing into the forward pneumatic chamber. A high pressure can be supplied in the forward direction to the piston at the forward limit position in a state where the piston rod at the forward limit position and the piston rod at the backward limit position are mixed. Thereby, the piston rod supporting the work at the forward end position can be strongly fixed.

Further, the work support device is characterized in that a scraper formed on the support base and for preventing entry of foreign matter from the outside into the projecting opening of the piston rod is provided on the support base. According to the present invention, it is possible to prevent foreign matter from entering from between the piston rod protruding outside from the work support base and the opening on the support base side.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a work supporting device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG. It is sectional drawing which follows.

As shown in FIG. 1, the work supporting apparatus has a support base 10 formed by a rectangular parallelepiped support block 10a and a cover member 10b fastened by a plurality of screw members 11 to an upper surface thereof. ing. As shown in FIG. 3, twelve cylinder chambers 12 are formed in the support block 10a in the vertical direction.
It is formed in a matrix with three rows and three columns. However, the number of cylinder chambers 12 is not limited to 12, and the number of rows and the number of columns can be set to any number, for example, about 20 to 30, respectively, according to the size of the work.

As shown in FIG. 2, a piston 13 is accommodated in each cylinder chamber 12 so as to be vertically reciprocable. Each piston 13 is provided with a piston rod 14. Rod 14
Protrudes upward through the cover member 10b. Each of the cylinder chambers 12 is defined by a piston 13 into a forward air pressure chamber 16 on the rear end face 15 side of the piston 13 and a backward air pressure chamber 18 on the front end face 17. Are sealed by a seal material 13a attached to the piston 13. Each of the pistons 13 and the piston rods 14
The moving direction projecting from 0 is the forward direction, and the opposite direction is the backward direction.

As shown in FIGS. 1 and 3, a supply / discharge port 21 is formed in the support base 10, and a main flow path 22a formed in the support base 10 in communication with the supply / discharge port 21 is formed by a branch flow path 22b. The main flow path 22a and the branch flow path 22b form a forward flow path 22 which communicates with the respective forward air pressure chambers 16. In addition, support table 1
0, a supply / discharge port 23 is formed.
The main flow path 24a formed in the support base 10 is communicated with the respective retraction air pressure chambers 18 by the branch flow paths 24b, and the main flow path 24a and the branch flow paths 24b communicate with the main flow path 24a. A channel 24 is formed.

As shown in FIG. 2, each piston 13 has a rear end position where its rear end surface 15 contacts a stopper surface 25a which is a bottom surface of the cylinder chamber 12, and a front end surface 1
7 is a stopper surface 25 formed on the inner surface of the cover member 10b.
It reciprocates between a forward limit position abutting on b. As shown in FIG. 2, a sealing member 26 made of rubber or the like and made of rubber or the like as an opening / closing member and elastically deformable and having a rectangular cross section is attached to the cover member 10b of the support base 10, as shown in FIG. Have been. The seal member 26 closes the retraction air pressure chamber 18 when the piston 13 reaches the forward limit position, and does not come into contact with the piston 13 when the piston 13 moves backward from the forward limit position by more than a predetermined stroke L. The chamber 18 communicates with the retreat channel 24.

FIG. 4 shows that compressed air is supplied to the respective retraction pneumatic chambers 18 via the retreat channel 24,
FIG. 2 is a diagram showing a pneumatic circuit for supplying compressed air to each forward air pressure chamber 16 through a second air pressure chamber; A forward air pressure control unit 27 is connected to the supply / discharge port 21 via a flow path, and a retreat air pressure control unit 28 is connected to the supply / discharge port 23 via a flow path. Each air pressure control unit 2
Reference numerals 7 and 28 each include a pressure adjusting valve for adjusting pressurized air from an air pressure source such as a compressor to a predetermined pressure, a flow path opening / closing valve, and the like, and the supply / discharge port 21 has a range of P1 to P2. Compressed air set to an arbitrary pressure is supplied.

The pressure supplied to the supply / discharge port 21 is regulated, for example, to a pressure in the range of P1 = 0.1 Mpa to P2 = 0.4 Mpa. On the other hand, the pressure supplied to the supply / discharge port 23 is supplied by switching between the air pressure of the pressure P3 and the air pressure of the pressure P0. For example, the pressure can be switched between P3 = 0.5 MPa and P0 = 0 MPa.

Therefore, when the supply pressure to the retreat channel 24 is set to a gauge pressure of 0 Mpa, and a pressure of, for example, 0.1 Mpa or more is supplied to the forward channel 22, the piston 13 moves forward as shown in FIG. , All the piston rods 14 are at the forward limit position. As shown in FIG. 1, if twelve piston rods 14 are provided on the work support base 10, all twelve piston rods 14 are at the forward limit position.

In this state, the piston 13 is at the forward limit position, and the front end face 17 thereof comes into contact with the sealing member 26 as an opening / closing member, and the communication between the retreating air pressure chamber 18 and the retreating passage 24 is established. Is shut off. Therefore, the air pressure supplied to the forward flow path 22 is set to P2, for example, 0.4 Mp
Even if the pressure is set to a and a pressure P3 higher than P2, for example, an air pressure of 0.5 MPa is supplied to the retreat channel 24, the piston rod 14 does not retreat.

In this manner, while the piston rod 14 is in the forward limit position as shown in FIG. 4, a thrust in the backward movement direction is applied to any one of the piston rods 14, and 14 is a predetermined stroke,
That is, when the seal member 26 moves backward more than the stroke L shown in FIG. 2, the seal member 26 separates from the front end face 17 of the piston 13, and the air pressure supplied to the backward flow channel 24 flows into the backward air pressure chamber 18. The thrust applied to the piston 13 in the retreating direction by the product of the inflowing pressure P3 and the pressure receiving area of the front end face 17 is determined by the product of the pressure P2 supplied to the forward pneumatic chamber 16 and the pressure receiving area of the rear end face 15. Is set larger than the thrust applied in the forward direction, the piston 13 moves backward to the retreat limit position. FIG.
2, the two piston rods 14 with the reference numeral are at the forward limit position, and the piston rods 14 with the reference numeral are at the retreat limit position, and the other piston rods 14 shown in FIG. Are all shown as the retracted positions.

As described above, if the compressed air is supplied to the retreat passage 24 when the piston rod 14 is at the forward limit position, if the seal member 26 and the piston 13 If a foreign substance enters between the front end face 17 or the seal member 26 is damaged, the compressed air supplied to the retreat passage 24 enters the front end face 17 side of the piston 13. If air enters, the air will enter the front end face 17 side of the piston 13, and the air pressure in the backward direction is applied to the piston 13, so that the piston 13 moves to the retreat limit position.

By the way, a small gap 31 is formed between the piston rod 14 and the cover member 10b so that the piston rod 14 slides smoothly in the axial direction. If the air leaks from between the piston 13 and the seal member 26 when the piston 13 is in the forward limit position as described above, the gap 31 allows the air to leak to the outside. Has become. This allows
Even if a leak occurs, no pressure is generated in the retraction pneumatic chamber 18, so that the piston rod 14 is prevented from retreating carelessly from the forward limit position.

However, when the piston 13 at the forward limit position retreats by a predetermined stroke L or more, the piston 13 retreats by a predetermined stroke L so that the retraction air pressure chamber 18 does not communicate with the outside through the leak path. The sealing member 32 for closing the leakage path
It is provided in. As the seal member 32, for example, an O-ring is used. The piston rod 14 has a predetermined stroke L from the forward limit position.
A constricted portion 33 is formed in order to reliably discharge the leaked air to the outside through the gap until the retracted movement. When the constricted portion 33 is located at a position corresponding to the seal member 32, a sufficient gap is formed between the piston rod 14 and the seal member 32.
On the other hand, when the piston 13 moves backward, the sealing member 32
Is in contact with the outer peripheral surface of the piston rod 14 to reliably prevent air from leaking. Accordingly, it is possible to prevent the seal member 26 serving as the opening / closing member from being damaged and the air supplied to the retreat passage 24 from leaking into the front end face 17 of the piston 13 at the forward limit position. In addition, the durability of the work supporting device can be improved.

FIG. 5 is a process chart showing a procedure for supporting a mounting substrate, which is a work, using the above-described work supporting device. FIG. 5A shows a state in which the mounting substrate W has been transferred to a position directly above the work supporting device by a transfer device (not shown). Components Wa such as ICs and LSIs are mounted on the lower surface of the mounting substrate W in advance. Under this condition, FIG.
As shown in (B), when the mounting substrate W moves closer to the work supporting device, a component Wa that interferes with one of the piston rods 14 comes into contact with the piston rod 14.

FIG. 5 (B) shows a state in which the center two piston rods 14 of the four piston rods 14 shown in FIG. When the mounting substrate W is successively moved toward the work supporting device and the tip surface of another piston rod 14 comes into direct contact with the mounting substrate W, the piston rod 14 in contact with the component Wa retreats by a predetermined stroke L or more. Will move. As a result, as described above, the compressed air supplied to the retreat channel 24 is released from the retreat air pressure chamber 18.
The piston rod 14 is supplied in FIG.
As shown in (C), it moves to the retreat limit position.

Therefore, as shown in FIG. 5C, another piston rod 14 comes into contact with a portion of the mounting substrate W where the component Wa is not mounted, and supports the mounting substrate W. In this state, it is possible to perform an operation of applying cream solder or mount other components on the upper surface of the mounting substrate W, and when performing an operation on the upper surface, it is mounted on the lower surface in advance. It is possible to prevent a load from being applied to the component Wa.

When the mounting substrate W is brought closer to the work supporting device, the mounting substrate W may be moved downward in FIG. 5, or conversely, the work supporting device may be moved upward. . Further, when the piston rods 14 that interfere with the component Wa are moved down to the retreat limit position, the thrust of the respective piston rods 14 in the forward direction is applied to the upper surface as shown in FIG. The pressure supplied to the forward air pressure chamber 16 may be adjusted by the forward air pressure control unit 27 so that the thrust becomes smaller than when performing.

FIG. 6 is an enlarged sectional view showing a part of a work supporting device having another type of opening / closing member. FIG. 6 shows two piston rods 14 at a forward limit position and a backward limit position. I have. In this work support device, a cylindrical stopper 36 constituting an opening / closing member is incorporated in a large-diameter accommodation hole 35 formed in the support block 10a.

FIG. 7 is a partially cutaway perspective view showing the opening and closing member. An annular groove 37 for accommodating the seal member 32 is formed in the stopper 36 on the inner peripheral surface.
2 has a V-shape unlike the seal member shown in FIG. At the lower end of the stopper 36 in FIG. 6, an annular accommodation groove 39 is formed by a large diameter portion 38a and a small diameter portion 38b, and the end surface of the small diameter portion 38b is formed on the stopper surface 25b.
It has become. A valve member 41 made of an elastic member such as rubber is mounted in the accommodation groove 39 so as to be movable in the axial direction. The valve member 41 has an end plate portion 41a, a small-diameter tube portion 41b and a large-diameter tube portion 41c integrated with the end plate portion 41a, and an annular groove portion 41d is provided between the small-diameter tube portion 41b and the large-diameter tube portion 41c. Are formed.

To apply a spring force toward the piston 13 to the valve member 41, the compression coil spring 42 is
The one end of the compression coil spring 42 is inserted into the annular groove 41d. Thereby, the piston 13
Until the valve member 41 moves backward from the forward limit position by a predetermined stroke L, the valve member 41 moves in the receiving groove 39 under the spring force of the compression coil spring 42 while contacting the front end face 17 of the piston 13. More than stroke L of piston 13
Moves backward, the valve member 41 comes into contact with the step surface, and the piston 13 separates from the valve member 41, so that the retreat pneumatic chamber 18 and the retreat channel 24 are in communication. By moving the valve member 41 in the axial direction in this way, in the case shown in FIGS. 6 and 7, the amount of elastic contraction of the valve member 41 when the piston 13 reaches the forward limit position is shown in FIG. The amount of contraction of the sealing member 26 is smaller than the amount of contraction.

FIG. 8 is an enlarged sectional view showing a part of a work supporting apparatus having another type of opening / closing member, and shows a part similar to FIG. In this work supporting device, a cylindrical stopper 36 which is incorporated in a large-diameter receiving hole 35 formed in the supporting block 10a and constitutes an opening / closing member is provided with a sealing member as shown in FIG. Member 32
Is formed in the inner peripheral surface. The stopper 36 has a stopper surface 25b with which the piston 13 comes into contact when the piston 13 reaches the forward limit position, and a fitting cylinder portion 43 into which a part of the piston 13 fits. The fitting cylindrical portion 43 has an inner peripheral surface thereof and the retreating channel 2.
A communication hole 44 that communicates with the piston 4 is formed, and a seal surface 45 that contacts the seal member 13b provided on the piston 13 is formed. Therefore, piston 1
Until 3 moves from the forward limit position by a predetermined stroke L, the sealing member 13b is
, The retreating air pressure chamber 18 and the retreating flow path 24 are shut off, and when the retreating movement is performed for a predetermined stroke or more, the retreating flow path 24 is in communication with the retreating air pressure chamber 18.

As shown in FIG. 8, the support 10 has a cylindrical stopper 4 corresponding to the retreat limit position of the piston 13.
7 is mounted, and a spring receiver 48 is mounted outside the stopper 47. The stopper 47 and the spring receiver 48 constitute a flow path opening / closing member. Stopper 47
Has an end plate portion 47a and a cylindrical portion 47b integrated therewith, and a through hole 49 is formed in the end plate portion 47a.
The spring receiver 48 has an end plate portion 48a and a cylindrical portion 48b integrated with the end plate portion 48a. A bleed hole 51 is formed in the end plate portion 48a, and the end plate portion 47a of the stopper 47 and the spring receiver 48 are formed.
And a compression coil spring 53 for applying a spring force to the valve member 52 in a direction to close the through hole 49.

A communication hole 54 for communicating the forward passage 22 and the forward air pressure chamber 16 is formed in the cylindrical portion 47b of the stopper 47.
Is formed, and when the compressed air is supplied into the forward air pressure chamber 16 through the communication hole 54, the through hole 49 is closed by the valve member 52. A seal surface 55 that contacts the seal member 13c provided on the piston 13 is formed on the inner peripheral surface of the cylindrical portion 47b of the stopper 47, and an operating rod 56 that projects rearward is provided on the rear end surface of the piston 13. When the piston 13 moves to the retreat limit position by the compressed air supplied to the retreat pneumatic chamber 18, the valve member 52 opens the through hole 49 by the operating rod 56, but is moved by the seal member 13 c.
The communication with the through hole 49 is cut off. Further, since the operating rod 56 contracts the compression coil spring 53 via the valve member 52, a forward spring force is applied to the piston 13.

As described above, when the piston 13 moves to the retreat limit position, the communication between the forward passage 22 and the forward pneumatic chamber 16 is cut off. Even if a high pressure is supplied to the forward flow path 22 in order to keep the piston 13 at the position, the piston 13 at the retreat limit position can be prevented from moving forward. Accordingly, the piston rod 14 supporting the work at the forward end position can be strongly fixed, and the piston rod 14 can be prevented from retreating even if the work W is strongly pressed during the work. When the piston rod 14 at the retreat limit position is moved forward, the retraction pneumatic chamber 1
When the pressure supplied to the piston 8 is reduced or the atmosphere is released to the atmosphere, the piston 13 at the retreat limit position moves forward by the spring force of the compression coil spring 53 to a position where the forward passage 22 and the forward air pressure chamber 16 communicate with each other. Then, it moves to the forward limit position by the compressed air from the forward flow path 22.

The channel opening / closing member shown in FIG. 8 may be incorporated in a work supporting device of the type shown in FIGS.

The cover member 10b constituting the support base 10 is an opening on the protruding side of the piston rod 14, and a holder 57 attached to the cover member 10b is provided with a scraper 58 made of a sealing member having a V-shaped cross section. Is held. The scraper 58 always has the piston rod 1
The outer peripheral surface of the piston rod 14 is in contact with the outer peripheral surface of the piston rod 4 to prevent foreign matter from entering from outside due to reciprocation of the piston rod 14 in the axial direction. In this case, air leaking from between the sealing member 13b and the sealing surface 45 cannot leak out from between the scraper 58 and the piston rod 14, so that the leaked air is discharged to the outside. An air vent passage 59 is formed in the support base 10.

The scraper 58 may not be used depending on the environment in which the work supporting device is used, or may be used in the work supporting device shown in FIGS. 2 and 6. 6 to 8, FIG.
The same reference numerals are given to members common to members in the embodiment shown in FIGS.

The present invention is not limited to the above embodiment, but can be variously modified without departing from the gist thereof. For example, the work supporting device shown in FIG. 1 has twelve piston rods 14 for supporting the mounting substrate W as a work, but an arbitrary number of piston rods may be provided depending on the size of the work. Can be. Further, the piston rods may be randomly arranged without being arranged in a matrix as shown in the figure. Further, in the illustrated work support device,
Although the piston rod moves vertically, the piston rod can be used by moving it forward or backward in any direction whether it is horizontal or inclined.

[0042]

According to the present invention, when an arbitrary piston rod of a plurality of piston rods is moved backward by a predetermined stroke, the piston rod moves to the retreat limit position. If there is a projecting surface on the supporting surface of the work that is to be supported, the piston rod corresponding to that surface moves backward, and the piston rod contacts only the predetermined supporting surface to support the work. Can be. Therefore, a plurality of types of works can be supported by one work supporting device.

When the piston rod is at the forward limit position, even if air supplied to the retreat passage leaks from between the piston and the opening / closing member, the air is exhausted to the outside via the leak passage. Therefore, the air pressure from the retreating channel does not act on the retreating air pressure chamber, and when the piston retreats by a predetermined stroke, the leakage path is closed by the seal member, and the pressure is reliably applied to the retreating air pressure chamber. Will be. This can prevent the piston rod from retreating carelessly.

Further, when the piston is at the retreat limit position, if the air from the forward passage is prevented from flowing into the forward pneumatic chamber by the passage opening / closing member, the piston rod at the forward limit position is removed. A high pressure can be supplied in the forward direction to the piston at the forward limit position in a state where the piston rod at the backward limit position is mixed with the piston rod at the backward limit position. Thereby, the piston rod supporting the work at the forward end position can be strongly fixed.

Further, by providing a scraper on the support table, it is possible to prevent foreign matter from entering between the piston rod projecting from the work support table to the outside and the opening on the support table side.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a work supporting device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a sectional view taken along line BB in FIG. 1;

FIG. 4 is a circuit diagram showing a pneumatic circuit of the work supporting device.

5 (A) to 5 (C) are process diagrams each showing a procedure for supporting a work.

FIG. 6 is an enlarged sectional view showing a part of a work supporting device having another type of opening / closing member.

FIG. 7 is a partially cutaway perspective view showing the opening and closing member shown in FIG. 6;

FIG. 8 is an enlarged cross-sectional view showing a part of a work supporting device having another type of opening / closing member.

[Explanation of symbols]

10 Work support 11 Screw member 12 cylinder chamber 13 piston 13a Seal member 14 Piston rod 15 Rear end face 16 pneumatic chamber for advance 17 Front end face 18 Retraction pneumatic chamber 21 Supply / discharge port 22 Forward channel 23 Supply / discharge port 24 Retreat channel 25a, 25b Stopper surface 26 Sealing member (opening / closing member) 27,28 Air pressure controller 31 gap (leakage path) 32 Sealing member 33 Constriction 35 Large-diameter accommodation hole 36 Stopper 37 annular groove 38a Large diameter part 38b small diameter part 39 accommodation groove 41 Valve member 42 Compression coil spring 43 Fitting tube 44 Communication hole 45 Seal surface 47 Stopper 48 Spring support 49 Through hole 51 Bleed hole 52 Valve member 53 Compression coil spring 54 Communication hole 55 sealing surface 56 Operating rod 57 Holder 58 Scraper

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Hirokuni Kurihara             5-2-2 Koyodai, Ryugasaki, Ibaraki Pref.             Hitachi Industries Ryugasaki Office F term (reference) 5E313 AA01 AA02 AA11 CC02 CC07                       CC09 DD01 DD02 DD05 EE01                       EE02 EE05 EE22 EE24 FF12                       FG04

Claims (6)

[Claims] 1. A support base having a plurality of cylinder chambers for reciprocally accommodating a piston provided with a piston rod contacting a work, and a forward air pressure of a rear end face side of the piston in the cylinder chamber. A forward passage communicating with the chamber; a backward passage communicating with a backward air pressure chamber of the cylinder chamber at the front end face side of the piston; and the backward air pressure when the piston reaches the forward limit position. An opening / closing member that closes the chamber and communicates the retreat air pressure chamber and the retreat channel when the piston moves backward by a predetermined stroke; and the open / close member when the piston is at a forward limit position. A sealing member that closes a leakage path that leaks air leaking from between the piston and the outside when the piston moves backward by a predetermined stroke; Work supporting device for the the forward pneumatic control unit for controlling the forward pressure applying thrust, characterized by having a and retracting pneumatic control unit for controlling the retraction pressure applying thrust backward direction to the piston. 2. The work supporting device according to claim 1, wherein the opening / closing member is formed of an elastically deformable sealing material that comes into contact with a front end surface of the piston when the piston reaches a forward limit position. And work supporting device. 3. The work support device according to claim 1, wherein a stopper having a stopper surface that comes into contact with the piston is attached to the support base, and the piston is mounted on the support base so as to be movable in the axial direction, and the piston moves forward. A work supporting device, wherein the opening / closing member is formed by a valve member that comes into contact with the piston until the piston moves backward from a limit position by a predetermined stroke. 4. The work support device according to claim 1, wherein the seal contacts the stopper surface contacting the piston and a seal member provided on the piston until the piston retreats from a forward limit position by a predetermined stroke. A work supporting device, wherein the opening and closing member is formed by a stopper having a surface. 5. A flow opening / closing member according to claim 1, wherein when the piston reaches a retreat limit position, the flow path opening / closing member shuts off the forward air pressure chamber and the forward flow path. And a spring member for moving the piston to a position where the forward pressure chamber and the forward flow path are communicated when the pressure of the backward pressure chamber is reduced. 6. The work support device according to claim 1, wherein the scraper is formed on the support base and prevents entry of foreign matter from the outside into the projecting side opening of the piston rod. A work support device provided on a support base.