JP2610116B2 - Rodless cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rodless cylinder, and more particularly to a rodless cylinder provided with a stopper device for fixing a moving body of the rodless cylinder at a predetermined position.

[0002]

2. Description of the Related Art Generally, a rodless cylinder accommodates a piston and a yoke portion movably in an axial direction of a cylinder tube in a cylinder tube formed in a cylindrical shape, and divides the inside of the cylinder tube into two pressure chambers. Sections are formed. A part of the yoke portion is exposed to the outside of the cylinder tube through a slit formed along an axial direction of an upper portion of the cylinder tube, and the exposed portion serves as a work mounting portion. Furthermore, a seal belt for keeping the pressure chamber airtight is stretched inside the slit so as not to restrict the movement of the piston and the yoke. Therefore, 2
When air is supplied to and discharged from the two pressure chambers, the air pressure causes the piston and the yoke to move in the axial direction of the cylinder tube, and the work mounting part also moves together with the piston and the yoke.

In this type of rodless cylinder,
A device provided with a stopper device as disclosed in Japanese Utility Model Laid-Open No. 3-23207 has been proposed. At the lower end of both ends of the cylinder tube of the rodless cylinder, through holes for stopper devices are respectively formed, and the stopper devices are fitted into the through holes. The stopper device includes a locking piston, a coil spring, and a closing cap, and the locking piston is constantly urged toward the axis of the cylinder tube by the coil spring. Then, the tip of the locking piston is projected from the inner wall of the cylinder tube while being urged.

[0004] Locking recesses for engaging with the locking piston are formed on the outer peripheral surfaces of both ends of the piston.
Therefore, when the piston moves and reaches both ends of the cylinder tube, the locking piston and the locking recess engage, and the piston of the rodless cylinder is fixed at that position.

[0005]

However, since this stopper device is provided in the cylinder tube, a failure such as damage to the locking piston occurs, and when performing maintenance work such as replacement of each part, There is a problem that it is necessary to disassemble the rodless cylinder itself, which takes time and labor.

Further, since the locking piston is directly pressed by air when the engagement with the locking recess is released, it is necessary to attach a seal member to the locking piston.
There is a problem that the configuration for supporting the locking piston is complicated.

In addition, since the sealing member is attached to the locking piston, it is necessary to use an extra strong coil spring or apply air pressure for the frictional force of the sealing member. However, there is a problem that the size becomes large.

Similarly, when the diameter of the locking piston is increased in order to increase the holding force at the time of the engagement, it is necessary to use a large-diameter seal member, and the friction by the seal member also increases. For this reason, it is necessary to use a stronger coil spring or the like, which causes a problem that the stopper device is further increased in size.

Further, since the locking piston keeps the piston stationary with respect to the cylinder tube, a force is applied to the locking piston in a direction perpendicular to the moving direction. As a result, when the engagement is released, there is a problem that air leaks into the gap between the piston and the cylinder tube, and the operability of the locking piston is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a rodless cylinder having a small and highly operable stopper device.

[0011]

According to a first aspect of the present invention, there is provided a cylinder tube having a slit formed in a cylinder tube extending in an axial direction thereof, and a working fluid in the cylinder tube. A rodless cylinder in which a piston movable in a direction is accommodated and a moving body moving integrally with the piston is exposed to the outside of the cylinder tube through the slit, either one of the moving body side and the cylinder tube side An engaging member which is always urged in a projecting direction by an urging member is provided, and an engaging recess engageable with the engaging member is provided on the other, and the engaging recess is driven by a working fluid. ,
The gist of the present invention is to provide a release member that moves the engagement member to a release position where the engagement with the engagement recess is released by pressing the engagement member against the urging force of the urging member. And

According to a second aspect of the present invention, in the first aspect of the invention, the release member is housed in a storage hole, and is operated in a working fluid supply chamber formed between the storage hole and a base end surface of the release member. The gist is that a communication passage for supplying a fluid is formed.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the engaging member is provided on at least an entry side of the engagement recess where the engagement member enters, as the engagement member approaches the engagement recess. The gist of the invention is to form a tapered portion that is inclined so as to press against the urging force of the urging member.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, a guide groove extending along the axial direction of the cylinder tube is formed on an outer surface of the cylinder tube, and the guide groove extends along the guide groove. The gist is that a movable and fixable slider member is provided, the engaging member is provided on the moving body side, and the engaging concave portion and the releasing member are provided on the slider member side.

[0015]

According to the first aspect of the present invention, when the working fluid is supplied to and discharged from the cylinder tube, the piston and the moving body move in the axial direction of the cylinder tube by the fluid pressure. Then, when the moving body moves to, for example, the engagement concave side provided on the cylinder tube side, and the engaging member on the moving body comes to a position opposed to the engaging concave side, the engaging member is pushed by the urging force of the urging means. Engages with the engagement recess. As a result, the moving body is fixed to the cylinder tube.

The holding force for fixing the moving body and the cylinder tube by the engagement is determined by the size (for example, diameter) of the engagement member.
Defined by In order to release the engaged state, the releasing member is driven by the working fluid, and the releasing member presses the engaging member to move it to the releasing position. An engagement member may be provided on the cylinder tube side, and an engagement recess may be provided on the moving body side.

According to the second aspect of the present invention, when the working fluid is introduced into the working fluid supply chamber formed on the base end face side of the release member through the communication passage, the release member presses the engagement member. Then, the engagement between the engagement member and the engagement recess is released.

According to the third aspect of the present invention, the engaging member that enters the engaging recess moves along the tapered portion and is easily engaged with the engaging recess. According to the fourth aspect of the present invention, the slider member is moved along the cylinder tube and positioned and fixed at an appropriate position, whereby the position at which the moving body is stopped by the engagement of the engagement member and the engagement recess is appropriately set. Can be changed to

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG. As shown in FIGS. 1 to 3, the cylinder tube 1 is formed in a cylindrical shape extending in the up-down direction. A slit 2 is formed in the cylinder tube 1 in the axial direction of the cylinder tube 1. End brackets 3 are respectively fitted to both open ends of the cylinder tube 1, and each end bracket 3 is provided with a supply / discharge port 4 protruding toward the inside of the cylinder tube 1.

A dust-proof belt 5 having both ends fixed to each end bracket 3 is stretched outside the slit 2, and a seal belt made of urethane rubber having both ends fixed to each end bracket 3 inside the slit 2. 6 is stretched. The dust-proof belt 5 is detachably fitted to the outer fitting portion 2a formed outside the slit 2, and the seal belt 6 is detachably fitted to the inner fitting portion 2b formed inside the slit 2. It has become. Therefore, the seal belt 6 prevents the working fluid (air in the present embodiment) supplied from the supply / discharge port 4 from leaking from the slit 2, and the dust-proof belt 5 prevents the entry of dust and the like into the cylinder tube 1. .

Inside the cylinder tube 1, a pair of pistons 7 are interposed between the pistons 7,
The yoke part 8 connected so as to be able to move integrally with the housing is accommodated. An insertion recess 10 into which the supply / discharge port 4 can be inserted is provided on an outer surface of each piston 7 facing the supply / discharge port 4. The interior of the cylinder tube 1 is divided into two pressure chambers by the respective pistons 7 and the yoke portions 8, and air is supplied to and discharged from the respective pressure chambers from the respective supply / discharge ports 4 so that the respective pistons 7 and the yoke portions 8 are formed. The cylinder tube 1 is moved in the axial direction.
Piston packings 9 are fitted to both outer ends of each piston 7 to prevent air from leaking from the pressure chamber.

As shown in FIG. 3, the yoke portion 8 includes a body portion 8a provided in the cylinder tube 1 and a head portion 8 exposed to the outside of the cylinder tube 1 through the slit 2.
b and a neck 8c connecting the body 8a and the head 8b. Further, a plate-shaped mount table 11 as a work mounting portion is connected to the head 8b. The mount table 11 constitutes the moving body of the present invention. An outer guide groove 12 is recessed in the axial direction of the cylinder tube 1 on the outer surface of the head 8b, and the outer opening of the outer guide groove 12 is closed by the mount table 11. The outer guide groove 12 is formed to be the shallowest at the center of the yoke portion 8, and is formed deeper toward each piston 7. Furthermore, the outer guide groove 1
The dust-proof belt 5 is inserted through 2, so that the head 8b of the yoke 8 does not catch on the dust-proof belt 5 even when it moves.

On the other hand, on the surface of the body 8a opposite to the head 8b, the inner guide groove 13 is formed in the axial direction of the cylinder tube 1.
Is recessed. The inner guide groove 13 is formed to be the shallowest at the center of the yoke portion 8, and is formed deeper toward each piston 7. Furthermore, the inner guide groove 13
The seal belt 6 is inserted through the shaft so that the body 8a does not get caught on the seal belt 6 even when the body 8a moves.

As shown in FIG. 3, first and second guide grooves 1a and 1b are formed on the left and right side walls of the cylinder tube 1 along the axial direction of the cylinder tube 1, respectively. The first guide groove 1a is formed near the center of the side wall of the cylinder tube 1, and the second guide groove 1b is formed in the first guide groove 1
It is formed closer to the mount table 11 than a. On both inner walls at the opening end of the guide groove 1a, fixing rails 14 protruding from both inner walls and extending along the first guide groove 1a are provided. The first guide groove 1a is used, for example, for mounting the cylinder tube 1 on a base or the like or mounting various components such as a piston position detection sensor.

In the second guide groove 1b, the inner surface on the mount table 11 side is formed so that the groove width increases toward the center, and the inner surface forms an engaging surface 1c.

In the thus constructed rodless cylinder, the piston 7 and the like move in the cylinder tube 1 by supplying and discharging air from each supply / discharge port 4 to each pressure chamber. The mount table 11 moves in the axial direction of the cylinder tube 1 according to the movement of the piston 7.

As shown in FIGS. 1, 4, and 5, a stopper device 20 for restricting the movement of the mount table 11 is attached to the cylinder tube 1. The stopper device 20 includes a stopper device main body 21 provided on the cylinder tube 1 side and an engaging body 22 provided on the mount table 11 side.

The stopper device main body 21 is mounted on the upper portion of the cylinder tube 1 and has a U-shape in plan view. Both side portions 23 of the stopper device main body 21 are located outside both wall portions of the cylinder tube 1, respectively. Each side portion 23 has two through holes 24 into which bolts are loosely inserted. A mounting portion 24a for mounting the head of the bolt is formed in the through hole 24.

A fixed plate 25 extending in the axial direction of the cylinder tube 1 is disposed in the second guide groove 1b. The fixing plate 25 is provided with the second guide groove 1b.
Is formed with an oblique concave portion 25a that can be engaged with the engaging surface 1c. Further, screw holes 26 are formed in the fixing plate 25 at two places along the longitudinal direction.

Then, the bolt 27 is inserted into the through hole 24 on the stopper device main body 21 side, and the bolt 27 is screwed into the screw hole 26 with the fixing plate 25 disposed in the second guide groove 1b. Thereafter, when the bolt 27 is tightened in a state where the head 27a of the bolt 27 is mounted on the mounting portion 24a, the engagement surface 1c and the concave portion 25a are pressed against each other,
The stopper device main body 21 is positioned and fixed to the cylinder tube 1. On the other hand, when the bolt 27 is loosened, the press-contact state between the engagement surface 1c and the concave portion 25a is released, so that the second guide groove 1b and the fixing plate 25 are released.
Is disengaged. When the engagement is released, the stopper device main body 21 can move together with the fixed plate 25 along the second guide groove 1b.

The surface of the stopper device main body 21 facing the upper surface of the mount table 11 is a regulating surface 28 for regulating the movement of the mount table 11. Regulatory surface 2
A shock absorber 29 is attached to 8 in the axial direction of the cylinder tube 1, and a rod 29 a of the shock absorber 29 protrudes from the regulating surface 28. Therefore,
Even if the mount table 11 collides with the rod 29 of the stopper device main body 21, the shock is absorbed by the shock absorber 29.

The regulating surface 28 has a shock absorbing amount adjusting bolt 30
Is screwed in, and the position of the tip is moved and adjusted in the axial direction of the cylinder tube 1 by rotating the shock absorption amount adjusting bolt 30. The shock absorption of the shock absorber 29 is adjusted based on the position of the tip of the shock absorption adjustment bolt 30.

As shown in FIGS. 1 and 5, a first storage plate 31 is fixed to a rear side surface of one side 23 of the stopper device main body 21 with a pair of bolts 32. The first storage plate 31 has a storage hole 33 and an air supply port 34 formed therein.
Are communicated with each other by a communication passage 35. The communication passage 35 communicates with the base end of the storage hole 33.

A release pin 38 as a release member is provided in the storage hole 33 so as to be movable along the storage hole 33. That is, the release pin 38 includes a large-diameter base end portion 39 and a small-diameter distal end portion 40. A seal member 41 is fitted on the outer periphery of the base end portion 39, and the seal member 41 is pressed against the entire inner peripheral surface of the storage hole 33. A circular notch 39b is formed on the base end surface 39a of the base end portion 39 along the outer periphery thereof. When the bottom surface of the base end surface 39a and the bottom surface of the storage hole 33 are in contact with each other, the annular space formed by the notch 39b becomes a working fluid supply chamber. Also, the base end face 3
When the bottom surfaces of the storage holes 9a and the storage holes 33 are separated from each other, the space formed by the notches 39b and the base end surface 39a
The space formed by the bottom surface of the storage hole 33 serves as an air supply chamber.

At the opening end of the storage hole 33, a recess 37 having a larger diameter than the storage hole 33 is formed, and a lock plate 41 is fixed to the recess 37. This lock plate 41
An engagement recess 42 is formed in the center of the. An insertion hole 43 that penetrates the lock plate 41 is formed in the bottom surface 42a of the engagement recess 42. The distal end 40 of the release pin 38 is inserted through the insertion hole 43. The surface of the lock plate 41 is formed with a tapered portion 44 which is inclined so as to protrude in a convex shape with the engagement recess 42 as a center. In other words, the tapered portion 44 is
9 toward the engagement recess 42 from the entry side of the engagement pin 4.
9 is pressed.

A spring 45 is provided between the lock plate 41 and the base end 39 of the release pin 38, and the release pin 3
8 is the mounting table 1 always by the spring force of the spring 45.
It is biased to the side opposite to 1.

On the other hand, on the side of the mount table 11,
The second storage plate 46 is fixed by bolts 47. A storage recess 48 is formed in the second storage plate 46. An engagement pin 49 as an engagement member is accommodated in the accommodation recess 48 so as to be movable along the axis of the accommodation recess 48. Engagement pin 49 and bottom surface 48 of storage recess 48
a, a spring 50 as an urging member is disposed between
The engagement pin 49 is urged toward the first storage plate 31 by the spring 50. Also, the bottom surface 48 of the storage recess 48
The air supply / discharge hole 51 for communicating the outside with the storage recess 48 for supplying and discharging the air accumulated in the space between the storage recess 48 and the engagement pin 49 according to the movement of the engagement pin 49 is provided at a.
Are formed.

A flange 49 is provided on the base end side of the engagement pin 49.
a is formed. The storage recess 48 has a flange 4.
A cylindrical body 52 that engages with 9a is fitted. The flange 49a is always connected to the cylindrical body 52 by the spring force of the spring 50.
Is held in a position in contact with the inner end of the.

In this state, the tip of the engaging pin 49 is disposed at a position which is always separated from the surface of the first storage plate 31 on the mount table 11 side. Therefore, the engagement pin 49 does not move while being in contact with the first storage plate 31, so that the engagement pin 49 can move smoothly.

Air is supplied to each supply / discharge port 4 from an air supply source E.
From the electromagnetic valve B. The air supply port 34 is connected to an air supply source via an electromagnetic valve B, so that air from the air supply source E is supplied. That is, the electromagnetic valve B controls the supply destination and the flow rate of the air from the air supply source E.

Next, the operation and effects of the rodless cylinder configured as described above will be described. Figure 1
In FIG. 2, when air from an air supply source is supplied from the lower supply / discharge port 4 based on control of the electromagnetic valve B,
The air pressure causes the pistons 7 and the yoke portion 8 to move upward, and the mount table 11 also moves upward because it is connected to the yoke portion 8. In this case, the second storage plate 46 fixed to the mount table 11 also rises.

When the mount table 11 reaches the portion of the cylinder tube 1 to which the stopper device main body 21 is fixed, first, the engaging pin 49 of the mount table 11 advances along the tapered portion 44. The dowel pin 49 advances while being pressed against the spring force. Then, when reaching the portion corresponding to the engaging recess 42, the engaging pin 49 is inserted into the engaging recess 42 by the spring force of the spring 50, and the engaging pin 49 and the engaging recess 42 are engaged. Therefore, the mount table 11, the piston 7, and the yoke 8 are fixed at that position. That is, even if the supply of air from the lower supply / discharge port 4 is stopped, the mount table 11, the piston 7, and the yoke 8 are fixed at that position and do not fall.

Further, since the shock absorber 29 is fitted to the stopper device main body 21, the shock when the engagement pin 49 and the engagement recess 42 are engaged is absorbed. Further, the regulation surface 28 is provided with a shock absorption adjustment bolt 30 for performing fine adjustment or the like for setting a shock absorption position of the shock absorber 29.

Next, the mount table 11, the piston 7
In order to release the fixed state of the yoke portion 8, first, the air from the air supply source E is supplied to the air supply port 34 based on the control of the solenoid valve B. Then, the air is introduced into the notch 39b and presses the pressing surface 39c of the notch 39b,
When the release pin 39 is pressed toward the mount table 11, the contact state between the base end 39a and the bottom surface of the storage hole 33 is released. Then, since the air is also introduced into the base end surface 39a side, the release pin 39 is quickly moved to the engagement pin 4.
9, the engagement between the engagement pin 49 and the engagement recess 39 is released.

The stopper device main body 21 can be moved along the cylinder tube 1. That is, in order to move the stopper device main body 21, first, the bolts 27 on both side portions 23 are loosened. Then, the engagement between the fixing plate 25 and the second guide groove 1b is released, and the stopper device main body 21 becomes movable along the cylinder tube 1. In this movable state, the stopper device main body 2
1 is moved to a desired place, and the bolt 27 is tightened at that position. Then, the stopper device main body 21 is fixed to the cylinder tube 1 again. At this time, the engagement between the engagement pin 49 and the engagement recess 42 is performed at a position based on the fixed position of the stopper device main body 21, and the mounting table 1
1, the movement of the piston 7 and the yoke portion 8 is performed between one end of the cylinder tube 1 and the stopper device main body 21.
Therefore, the moving range of the mount table 11, the piston 7, and the yoke 8 is adjusted by changing the fixing position of the stopper device main body 21.

Therefore, in this embodiment, the engagement pin 49 and the release pin 39 are separately provided on the mount table 11 side and the cylinder tube 1 side, respectively.
The release pin 39 is used to release the engagement between
Is operated by air. Therefore, there is no need to provide a seal member on the engagement pin 49 side. Therefore, when the engagement pin 49 moves, no friction is generated on the engagement pin 49 side by the seal member, and the engagement pin 49 can be moved smoothly. In addition, since the seal member is not provided on the engagement pin 49 side, even if the diameter of the engagement pin 49 is increased in order to increase the holding force due to the engagement between the engagement pin 49 and the engagement recess 42, the engagement member is not required. The air pressure applied to the release pin 39 may be increased by the increase in the diameter of the mating pin 49, and the engagement with the engagement pin 49 can be easily released. For this reason, the holding force by the engagement between the engagement pin 49 and the engagement recess 42 can be easily increased without increasing the size of the stopper device 20.

Further, since air is supplied to the base end surface 39a of the release pin 39, a seal member may be provided at one place so that air does not escape from the base end surface 39a to the distal end side. The configuration can be simplified as compared with a case where air is supplied to the center portion side and seal members are provided on both sides of the base end side and the distal end side so that air does not escape.

Further, the lock plate 43 has a tapered portion 44.
Is provided, the engagement pin 49 is provided in the engagement recess 42.
When the engagement pin 49 is engaged with the lock plate 43,
It is possible to easily move to the engagement recess 42 along the tapered portion 44 without being caught by the like, and to easily engage with the engagement recess 42.

Since the stopper device main body 21 can move along the guide groove 1b, the engaging recess 42 and the engaging pin 49
The position fixed by the engagement with can be changed as appropriate. Accordingly, this engagement causes the mounting table 1
1, the piston 7 and the yoke portion 8 can be appropriately fixed at desired positions. In addition, the mount table 11, the piston 7, and the yoke 8 move between one end of the cylinder tube 1 and the stopper device main body 21. Therefore, the moving range of the mount table 11, the piston 7, and the yoke 8 can be appropriately adjusted by changing the fixing position of the stopper device main body 21.

In this embodiment, since the shock absorber 29 is provided on the stopper device main body 21, the shock when the mount table 11 and the stopper device main body 21 collide can be absorbed. Further, the shock absorber 23
By adjusting the shock absorption amount adjusting bolt 24 so as to engage the engagement pin 49 with the engagement recess 42 at the time of shock absorption, the engagement pin 49 approaches the engagement recess 42 at a slow speed. , Can be engaged with the engagement concave portion 42, so that the engagement can be surely performed.

The present invention is not limited to the above-described embodiment, but can be implemented as follows with appropriate modifications without departing from the spirit of the invention. (1) In the above embodiment, an engagement mechanism is provided by engagement pins 49 and engagement recesses 42 on both sides of the cylinder tube 1 so that the stopper device 20 fixes the mount table 11 and the like on both sides of the cylinder tube 1. May be configured. In this case, the mount table 11 and the like can be securely fixed on both sides of the cylinder tube 1.

(2) In the above embodiment, the first storage plate 31 may be disposed on the mount table 11 side with respect to the second storage plate 46. In this case, the engagement recess 49
Are located on the mount table 11 side with respect to the engagement pins 49.

(3) In the above embodiment, the engaging recess 4 is provided on the mount table 11 side, that is, in the first storage plate 31.
2 and the like, and the engagement pin 39 may be formed on the cylinder tube 1 side, that is, on the second plate 46.

(4) In the above embodiment, it is not necessary to provide the shock absorber 29 in the stopper device 21. The technical ideas other than the claims that can be grasped from the above embodiment will be described below together with their effects.

The rodless cylinder according to any one of claims 1 to 4, wherein the shock absorber 29 is provided in the stopper device 21 so that the shock absorber 29 operates when the engagement recess 42 is engaged with the engagement pin 49. Cylinder. According to this rodless cylinder, the engagement recess 42
The shock at the time of engagement with the engagement pin 49 can be reduced by the shock absorber 29.

The term “working fluid” used in the present specification is defined as follows. The “working fluid” is a fluid that operates a fluid device such as the rodless cylinder or the release pin of the stopper device shown in the above embodiment by its pressure, and is not only a gas such as the air but also a liquid such as a working oil. It is a meaning including also.

[0057]

As described in detail above, according to the first aspect of the present invention, the engaging member and the releasing member constituting the stopper device of the rodless cylinder are separately provided on the cylinder tube side and the moving body side. Thereby, the operability can be improved with a small size, and the holding force at the time of engagement can be easily changed only by changing the size of the engagement member. Claim 2
According to the invention described above, since the working fluid is supplied to the base end face, the structure can be simplified since it is only necessary to provide the seal member on the front end side so that the working fluid does not leak. According to the third aspect of the present invention, since the engaging member that enters the engaging recess moves along the tapered portion, it can be easily engaged with the engaging recess. According to the invention described in claim 4, the slider member is moved along the cylinder tube and is positioned at a desired position, so that the position at which the moving body is fixed by the engagement of the engagement member and the engagement recess is appropriately set. Can be changed.

[Brief description of the drawings]

FIG. 1 is a side view of a rodless cylinder.

FIG. 2 is a sectional view of a rodless cylinder.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a partially broken plan view of the rodless cylinder.

FIG. 5 is a plan view of a rodless cylinder.

FIG. 6 is a sectional view showing an engagement state between an engagement pin and an engagement recess.

[Explanation of symbols]

1 ... Cylinder tube, 1b ... First and 1st as guide groove
2nd guide groove, 2 slits, 7 pistons, 21 stopper body as a slider member, 11 mount table as a moving body, 33 storage holes, 35 communication passages, 39 release members, 39a base End face, 42: engagement concave portion, 44: tapered portion, 49: engagement pin as an engagement member, 50: spring as a biasing member.

Claims (4)

(57) [Claims] A moving body which has a slit formed in a cylinder tube extending in the axial direction thereof, and a piston movable in the axial direction by a working fluid is accommodated in the cylinder tube, and moves integrally with the piston. In the rodless cylinder, which is exposed to the outside of the cylinder tube through the slit, an engagement member is provided on one of the moving body side and the cylinder tube side, which is always urged by the urging member in a direction in which it is projected. An engaging recess engageable with the engaging member is provided on the other, and the engaging recess is driven by a working fluid to press the engaging member against the urging force of the urging member. A release member for moving the engagement member to a release position at which the engagement with the engagement recess is released. 2. The communication device according to claim 1, wherein the release member is housed in the storage hole, and a communication passage for supplying a working fluid to a working fluid supply chamber formed between the storage hole and a base end surface of the release member is formed. The rodless cylinder according to claim 1. 3. A taper that is inclined toward at least the entry side of the engagement recess where the engagement member enters, so as to push the engagement member toward the engagement recess against the urging force of the urging member. The rodless cylinder according to claim 1 or 2, wherein a portion is formed. 4. A guide groove extending along an axial direction of the cylinder tube is formed on an outer surface of the cylinder tube, and a slider member movable and fixed along the guide groove is provided, and a slider member is provided on the moving body side. Providing the engagement member,
The rodless cylinder according to any one of claims 1 to 3, wherein the engagement recess and the release member are provided on a slider member side.