JP2012180862A - Rodless cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rodless cylinder which is not enlarged in the axial direction even when a stopper for stopping a slider at an intermediate position is installed.SOLUTION: A first cylinder 10 and a second cylinder 30 are connected in parallel with each other by a connection member 51. A first piston 14 is accommodated in a first cylinder tube 11, a second piston 34 is accommodated in a second cylinder tube 31, and first and second sliders 54, 55 to be moved following the pistons 14, 34 are provided outside the cylinders 10, 30. The first slider 54 is arranged on one end side in the axial direction of the cylinders 10, 30 from the second slider 55. A stopping member 25 is provided in the first cylinder tube 11, and the first piston 14 in contact with the stopping member 25 is stopped.

Description

  The present invention relates to a rodless cylinder in which a slider provided outside a cylinder tube moves following a piston accommodated in the cylinder tube.

As a rodless cylinder, there is one that can stop a slider disposed outside a cylinder tube between both stroke ends (for example, Patent Document 1).
As shown in FIG. 6, in the rodless cylinder 100 described in Patent Document 1, a first cover 102 is attached to one end of the cylinder tube 101, and a cylindrical second cover 103 is attached to the other end. Yes. The cylinder tube 101 accommodates a piston 104, and the piston 104 partitions the cylinder tube 101 into a first pressure chamber 105 on the first cover 102 side and a second pressure chamber 106 on the second cover 103 side. ing. A plurality of permanent magnets 107 and yokes 108 are supported on the piston 104 in a state of being alternately stacked in the axial direction of the cylinder tube 101. A slider 109 is disposed outside the cylinder tube 101, and a plurality of permanent magnets 110 and yokes 111 are supported on the slider 109 in a state of being alternately stacked in the axial direction of the cylinder tube 101. Polarities of the permanent magnet 107 supported by the piston 104 and the permanent magnet 110 supported by the slider 109 are set to be opposite to each other. As a result, a magnetic attraction force acts between the piston 104 and the slider 109 so that the slider 109 moves following the piston 104.

  An intermediate stop cylinder tube 120 having a tube diameter larger than that of the cylinder tube 101 is continuously provided on the same axis of the cylinder tube 101 via a second cover 103. In the intermediate stop cylinder tube 120, a third cover 121 is attached to the end opposite to the second cover 103. The intermediate stop cylinder tube 120 accommodates a piston 122 having a diameter larger than that of the piston 104, and the piston 122 causes the intermediate stop cylinder tube 120 to be connected to the third pressure chamber 123 on the third cover 121 side and the second pressure chamber 123. It is partitioned into a fourth pressure chamber 124 on the cover 103 side. A piston rod 125 is integrally formed with the piston 122, and the piston rod 125 extends toward the cylinder tube 101.

  The rodless cylinder 100 moves the slider 109 from one end to the other end of the cylinder tube 101 together with the piston 104 by switching the supply of fluid to the first pressure chamber 105 and the second pressure chamber 106, and both strokes. It can be moved to the end. Further, when it is desired to stop the slider 109 at one stroke end at an intermediate position between both stroke ends, fluid is supplied to the third pressure chamber 123 and the first pressure chamber 105. At this time, since the pressure receiving area of the piston 122 is larger than the pressure receiving area of the piston 104, when the fluid having the same pressure is supplied, the piston 122 moves until it abuts against the inner end surface of the second cover 103. As the piston 122 moves, the piston rod 125 passes through the second cover 103 and protrudes into the cylinder tube 101, and the piston 104 comes into contact with the tip of the piston rod 125. The movement of the piston 104 is restricted by this contact, and the slider 109 can be stopped at the intermediate position.

  In addition, when the fluid is discharged from the third pressure chamber 123 in a state where the fluid is supplied to the first pressure chamber 105, the piston 104 presses the piston rod 125 toward the outside of the cylinder tube 101 and the inner end surface of the second cover 103. Move until it touches. Thereby, the slider 109 acting on the piston 122 can be moved from the intermediate position to the other stroke end.

JP 2000-27809 A

  By the way, in the rodless cylinder 100 described in Patent Document 1, in order to move the slider 109 from the intermediate position to the other stroke end, it is necessary to move the piston rod 125 out of the cylinder tube 101 along its axial direction. is there. For this reason, in Patent Document 1, it is necessary to continuously connect the intermediate stop cylinder tube 120 in the axial direction of the cylinder tube 101, and the rodless cylinder 100 is enlarged in the axial direction.

  The present invention has been made paying attention to such problems existing in the prior art, and the purpose thereof is a rodless which does not increase in size in the axial direction even if a stopper for stopping the slider at an intermediate position is provided. To provide a cylinder.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a first cylinder in which a first piston that is moved by supplying and discharging fluid is housed in a first cylinder tube, and a second cylinder that is moved by supplying and discharging fluid. A second cylinder in which the piston is accommodated in the second cylinder tube is connected in parallel by a connecting member, and moves outside the first and second cylinder tubes following the first piston. A first slider and a second slider that moves following the second piston are disposed, and the first slider is disposed closer to one end in the axial direction of both cylinders than the second slider. And the second slider is movable by being pressed against each other, and the first piston is placed in both the straws of the first cylinder in the first cylinder tube. An intermediate position stopper for stopping at an intermediate position between the ends is provided so as to be able to enter and exit the first cylinder tube, and further, the first slider is stopped when the first piston is stopped by the intermediate position stopper. Accordingly, the gist is provided with an intermediate position stop mechanism for stopping the second slider at the intermediate position.

  According to a second aspect of the present invention, in the first aspect of the invention, the intermediate position stop mechanism is a thrust control unit that makes a thrust generated in the second piston smaller than a thrust generated in the first piston. It is a summary.

The invention according to claim 3 is the gist of the invention according to claim 1, wherein the intermediate position stop mechanism is an attachment / detachment mechanism that makes the first slider and the second slider attachable / detachable.
The gist of the invention described in claim 4 is that, in the invention described in claim 3, the attachment / detachment mechanism is a magnet.

  According to the present invention, even if a stopper for stopping the slider at an intermediate position is provided, the rodless cylinder does not increase in size in the axial direction.

Sectional drawing of the rodless cylinder in 1st Embodiment. (A) is sectional drawing which shows the stop state in the intermediate position of the rodless cylinder in 1st Embodiment, (b) is sectional drawing which shows the stop state in the other end side stroke end of the rodless cylinder in 1st Embodiment. . Sectional drawing of the rodless cylinder in 2nd Embodiment. (A) is sectional drawing which shows the stop state in the intermediate position of the rodless cylinder in 2nd Embodiment, (b) is sectional drawing which shows the stop state in the other end side stroke end of the rodless cylinder in 2nd Embodiment. . Sectional drawing which shows another example of the rodless cylinder in 1st Embodiment. Sectional drawing which shows the rodless cylinder of a prior art example.

(First embodiment)
A first embodiment in which the rodless cylinder of the present invention is embodied as a magnet type rodless cylinder will be described below with reference to FIGS.

  As shown in FIG. 1, the magnet type rodless cylinder 1 is configured by connecting a first cylinder 10 and a second cylinder 30 in a parallel state by a connecting member 51. In the first cylinder 10, a first head cap 12 is fitted to one axial end (right end in the figure) of the first cylinder tube 11, and a first end cap 13 is fitted to the other axial end (left end in the figure). Are fitted. A first piston 14 is accommodated in the first cylinder tube 11. The first piston 14 is configured by alternately arranging annular permanent magnets 17 and yokes 18 in a piston main body 19 and inserting a piston shaft 20 through the piston main body 19, permanent magnet 17 and yoke 18. An annular cushion ring 21 is fixed to both ends of the piston body 19.

  The first piston 14 divides the inside of the first cylinder tube 11 into a first chamber 15 on the first head cap 12 side and a second chamber 16 side on the first end cap 13 side. The first head cap 12 is formed with a first supply / discharge port 12 a that communicates with the first chamber 15 and supplies and discharges air as a fluid to and from the first chamber 15.

  A compressor 62 is connected to the first supply / discharge port 12a via a first switching valve 61. The first switching valve 61 can be switched between two states, a first position a1 and a second position b1. When the first switching valve 61 is switched to the first position a1, the first supply / discharge port 12a is opened to the atmosphere, and air is discharged from the first chamber 15. In addition, when the first switching valve 61 is switched to the second position b1, the first supply / discharge port 12a and the compressor 62 communicate with each other so that air is supplied to the first chamber 15.

  In the second cylinder 30, a second head cap 32 is fitted to one end of the second cylinder tube 31, and a second end cap 33 is fitted to the other end. A second piston 34 is accommodated in the second cylinder tube 31. The second piston 34 is configured by alternately arranging annular permanent magnets 37 and yokes 38 in the piston main body 39 and inserting a piston shaft 40 through the piston main body 39, permanent magnet 37 and yoke 38. An annular cushion ring 41 is fixed to both ends of the piston body 39. The first piston 14 is located closer to one axial end of the magnet type rodless cylinder 1 than the second piston 34.

  The second piston 34 divides the second cylinder tube 31 into a third chamber 35 on the second head cap 32 side and a fourth chamber 36 on the second end cap 33 side. The second head cap 32 is formed with a second supply / exhaust port 32 a communicating with the third chamber 35, and the second end cap 33 is formed with a third supply / exhaust port 33 a communicating with the fourth chamber 36. Yes.

  A second switching valve 63 is connected to the second and third supply / discharge ports 32a and 33a. A compressor 62 is connected to the second switching valve 63 via a regulator 64. The second switching valve 63 can be switched between two states, a first position a2 and a second position b2. When the second switching valve 63 is switched to the first position a2, the second supply / discharge port 32a and the compressor 62 communicate with each other via the regulator 64, whereby air is supplied to the third chamber 35, and Air is discharged from the fourth chamber 36 by opening the third supply / discharge port 33a to the atmosphere. When the second switching valve 63 is switched to the second position b2, the third supply / discharge port 33a and the compressor 62 communicate with each other via the regulator 64, whereby air is supplied to the fourth chamber 36. The air is discharged from the third chamber 35 by opening the second supply / discharge port 32a to the atmosphere.

  The regulator 64 controls the pressure of air supplied from the compressor 62. In the present embodiment, the regulator 64 depressurizes the air supplied from the compressor 62 and makes the pressure of the air acting on the second piston 34 lower than the pressure of the air acting on the first piston 14. Since the air pressure acting on the second piston 34 is lower than the air pressure acting on the first piston 14, the thrust generated on the second piston 34 is smaller than the thrust generated on the first piston 14. Become. Therefore, in the present embodiment, the regulator 64 that controls the air pressure is the thrust control means. And by switching each switching valve 61 and 63, supply and discharge of the air to the 1st, 3rd and 4th chambers 15, 35, and 36 are switched, and each piston 14 and 34 can be moved.

  A first slider 54 and a second slider 55 are provided outside the first and second cylinders 10 and 30. The first slider 54 is provided closer to one end side in the axial direction than the second slider 55. In this embodiment, the second slider 55 constitutes a work transfer table. Each of the sliders 54 and 55 is a cylindrical body whose outer shape is a rectangular parallelepiped shape and has through-holes 54a and 55a having circular cross sections penetrating in the longitudinal direction inside, and the through-holes 54a and 55a have first cylinders respectively. The tube 11 and the second cylinder tube 31 are inserted. Thereby, both sliders 54 and 55 can move along the axial direction outside both cylinders 10 and 30.

  In the first slider 54, the permanent magnets 22 and the yokes 23 are alternately arranged around the through holes 54a. The permanent magnet 22 on the first slider 54 side and the permanent magnet 17 on the first piston 14 side are set so that the polarities are reversed. Due to the magnetic attractive force between the first piston 14 and the first slider 54, The first slider 54 moves following the first piston 14.

  In the second slider 55, the permanent magnets 42 and the yokes 43 are alternately arranged around the through holes 55a. The permanent magnet 42 on the second slider 55 side and the permanent magnet 37 on the second piston 34 side are set so that the polarities are reversed. Due to the magnetic attractive force between the second piston 34 and the second slider 55, The second slider 55 follows the second piston 34 and moves. Further, in each slider 54, 55, a cushion member 56 is provided on an end surface facing each other, and the cushion member 56 is designed to reduce an impact when the sliders come into contact with each other.

  A first stopper 52 is provided between the first head cap 12 and the second head cap 32 in the connecting member 51 provided on one axial end side of each cylinder 10, 30, and on the other axial end side. In the provided connection member 51, a second stopper 53 is provided between the first end cap 13 and the second end cap 33. The second slider 55 stops at one end side stroke end where the first slider 54 contacts the first stopper 52 and at the other end side stroke end where the second slider 55 contacts the second stopper 53. .

  A nut N is fixed to the end face of the first end cap 13 on the other axial end side of the magnet type rodless cylinder 1, and the first end cap 13 extends along the axial direction of the first cylinder tube 11. An extending through hole 13a is formed. A rod 24 is screwed onto the nut N, and the rod 24 protrudes into the first cylinder tube 11 through the through hole 13a. In the rod 24, a stop member 25 is fitted to an end portion in the first cylinder tube 11. When the first piston 14 moves from one axial end of the first cylinder tube 11 toward the other end, the first piston 14 comes into contact with the stop member 25, and the second slider 55 together with the first slider 54 has both stroke ends. It stops at the middle position. Therefore, in this embodiment, the rod 24 and the stop member 25 constitute an intermediate position stopper. The rod 24 can be moved in and out of the first cylinder tube 11 by changing the screwing amount to the nut N. That is, the intermediate position can be arbitrarily changed by changing the screwing amount.

Next, the operation of the magnet type rodless cylinder 1 in this embodiment will be described.
First, as shown in FIG. 1, it is assumed that the first switching valve 61 is switched to the first position a1, and the second switching valve 63 is switched to the second position b2. At this time, in the magnet type rodless cylinder 1, air is supplied to the fourth chamber 36, and the second slider 55 stops at the one end side stroke end.

  As shown in FIG. 2A, when the second slider 55 is stopped at the intermediate position, the first switching valve 61 is moved from the first position a1 to the second position with air supplied to the fourth chamber 36. Switch to b1, and supply air to the first chamber 15. At this time, the pressure of the air acting on the second piston 34 due to the pressure adjustment by the regulator 64 becomes lower than the pressure of the air acting on the first piston 14, so that the first piston 14 is connected to one end in the axial direction of the first cylinder tube 11. The thrust to move to the side exceeds the thrust to move the second piston 34 to the other axial end side of the second cylinder tube 31. As a result, the force with which the first slider 54 presses the second slider 55 exceeds the force with which the second slider 55 presses the first slider 54. Therefore, the first slider 54 moves following the movement of the first piston 14 toward the other end side stroke end, and the second slider 55 moves toward the other end side stroke end while being pressed by the first slider 54. Moving.

  When the first piston 14 contacts the stop member 25, the first piston 14 stops and the second slider 55 stops at the intermediate position. At this time, the second piston 34 and the second slider 55 try to continue moving toward the other end side stroke end by inertial force, but the second piston 34 is moved to the second chamber 36 by the air supplied to the fourth chamber 36. Since the cylinder tube 31 is pressed toward one end in the axial direction, the second slider 55 does not move due to the inertial force but stops at the intermediate position. Further, since the thrust generated in the second piston 34 is smaller than the thrust generated in the first piston 14, the sliders 54 and 55 do not move toward the stroke end on the one end side, and the second slider 55 is at the intermediate position. Stop. That is, in this embodiment, the regulator 64 which is a thrust control means becomes an intermediate position stop mechanism.

  As shown in FIG. 2B, when the second slider 55 is moved from the intermediate position to the other end side stroke end, the second switching valve 63 is moved to the second position b2 while air is supplied to the first chamber 15. Is switched to the first position a2 to supply air to the third chamber 35 and to discharge air from the fourth chamber 36. Then, the second piston 34 moves to the other end side of the second cylinder tube 31, and the second slider 55 follows the second piston 34 and moves to the other end side stroke end.

  On the other hand, as shown in FIG. 1, when the second slider 55 is moved to the one end side stroke end, the first switching valve 61 is switched from the second position b1 to the first position a1, and the second switching valve 63 is switched to the second position. The position is switched from the first position a2 to the second position b2. Then, air is supplied to the fourth chamber 36 and air is discharged from the first and third chambers 15 and 35. Then, the second piston 34 moves from the other end side of the second cylinder tube 31 toward the one end side, and the second slider 55 moves following the second piston 34. Then, the second slider 55 moves to the one end side stroke end while pressing the first slider 54.

According to the above embodiment, the following effects can be obtained.
(1) The first cylinder 10 and the second cylinder 30 are connected in parallel by the connecting member 51. In addition, the first piston 14 was accommodated in the first cylinder 10, and the second piston 34 was accommodated in the second cylinder 30. The first and second sliders 54 and 55 that move following the pistons 14 and 34 are provided outside the cylinders 10 and 30, and the first slider 54 is disposed on one axial end side of the second slider 55. . Since the first slider 54 and the second slider 55 move following the pistons 14 and 34, respectively, a cylinder for moving the second slider 55 from the intermediate position to the stroke end at the other end is required in the axial direction. Therefore, the magnet type rodless cylinder 1 does not increase in size in the axial direction.

(2) The thrust generated in the second piston 34 by the pressure adjustment by the regulator 64 is adjusted to be smaller than the thrust generated in the first piston 14. Therefore, when the second slider 55 is stopped at the intermediate position, the second slider 55 can be prevented from moving to the one end side stroke end, and the second slider 55 can be stopped at the intermediate position.
(Second Embodiment)
Next, a second embodiment in which the rodless cylinder of the present invention is embodied as a magnet type rodless cylinder will be described with reference to FIGS. In the embodiment described below, the same description as in the first embodiment is omitted or simplified.

  As shown in FIG. 3, the magnet type rodless cylinder 2 in the present embodiment is provided with a magnet M <b> 1 on the surface facing the second slider 55 in the first slider 54, and in the second slider 55, the first slider 54. A magnet M <b> 2 is provided on the surface facing the slider 54. The magnet M1 of the first slider 54 and the magnet M2 of the second slider 55 are set so that the polarities are reversed. Thus, the first slider 54 and the second slider 55 are attracted by the magnetic attractive force of the magnets M1 and M2. This magnetic attraction force is strong enough to prevent the second slider 55 and the first slider 54 from being attracted by the inertial force generated when the second slider 55 stops at the intermediate position, and is supplied to the third chamber 35. The strength is set so that the suction is released by the air to be released. That is, in this embodiment, the magnets M1 and M2 constitute an attachment / detachment mechanism. Since the second slider 55 and the first slider 54 are attracted by this attaching / detaching mechanism, when the second slider 55 stops at the intermediate position, the second slider 55 moves to the other end side stroke end by inertial force. There is nothing. Therefore, the attachment / detachment mechanism (magnets M1, M2) serves as an intermediate position stop mechanism.

  A compressor 62 is connected to the second supply / discharge port 32a via a first switching valve 61. When the first switching valve 61 is switched to the first position a1, the air is discharged from the third chamber 35 by opening the second supply / discharge port 32a to the atmosphere. When the first switching valve 61 is switched to the second position b1, the second supply / discharge port 32a and the compressor 62 communicate with each other so that air is supplied to the third chamber 35.

  A compressor 62 is connected to the first supply / discharge port 12 a and the third supply / discharge port 33 a via a second switching valve 63. When the second switching valve 63 is switched to the first position a2, the third supply / discharge port 33a and the compressor 62 communicate with each other so that air is supplied to the fourth chamber 36 and the first supply / discharge port 12a is Air is discharged from the first chamber 15 by being released to the atmosphere. When the second switching valve 63 is switched to the second position b2, the first supply / discharge port 12a and the compressor 62 communicate with each other so that air is supplied to the first chamber 15 and the third supply / discharge Air is discharged from the fourth chamber 36 by opening the port 33a to the atmosphere.

Next, the operation of the magnet type rodless cylinder 2 in this embodiment will be described.
First, as shown in FIG. 3, it is assumed that the first switching valve 61 is switched to the first position a1, and the second switching valve 63 is switched to the first position a2. At this time, in the magnet type rodless cylinder 2, air is supplied to the fourth chamber 36, and the second slider 55 is stopped at the one end side stroke end.

  4A, when the second slider 55 is stopped at the intermediate position, the second switching valve 63 is switched from the first position a2 to the second position b2, and air is supplied to the first chamber 15. At the same time, air is discharged from the fourth chamber 36. Then, the second slider 55 moves from one end in the axial direction toward the other end while being pressed by the first slider 54.

  When the first piston 14 comes into contact with the stop member 25, the second slider 55 stops together with the first slider 54 as the first piston 14 stops. At this time, since the second slider 55 and the first slider 54 are attracted by the magnetic attractive force, the second slider 55 stops at the intermediate position without moving toward the other end side stroke end by the inertial force.

  As shown in FIG. 4B, when the second slider 55 is moved from the intermediate position to the other end side stroke end, the first switching valve 61 is moved to the first position a1 while air is supplied to the first chamber 15. Is switched to the second position b1 to supply air to the third chamber 35. Then, the pressure of air acting on the second piston 34, that is, the thrust generated in the second piston 34 exceeds the magnetic attractive force by the magnets M1 and M2, and the adsorption of the first slider 54 and the second slider 55 is released. . Then, the second piston 34 moves to the other end side of the second cylinder tube 31, and the second slider 55 follows the second piston 34 and moves to the other end side stroke end.

  As shown in FIG. 3, when the second slider 55 is moved to the one-end side stroke end, the first switching valve 61 is switched from the second position b1 to the first position a1, and the second switching valve 63 is switched to the second position b2. To the first position a2. Then, air is supplied to the fourth chamber 36 and air is discharged from the first and third chambers 15 and 35. The second piston 34 moves from the other end of the second cylinder tube 31 toward one end, and the second slider 55 moves following the second piston 34. The second slider 55 continues to move to the one end side stroke end while pressing the first slider 54.

According to the said 2nd Embodiment, in addition to the effect similar to (1) as described in 1st Embodiment, the following effects can be acquired.
(3) The magnets M1 and M2 are provided on the first slider 54 and the second slider 55, and the first slider 54 and the second slider 55 can be attached and detached by the magnetic attractive force of the magnets M1 and M2. For this reason, when the first slider 54 is stopped at the intermediate position, the second slider 55 can be stopped at the intermediate position by the magnetic attractive force of the magnets M1 and M2. As a result, in order to stop the second slider 55 at the intermediate position, it is not necessary to control the thrust so that the thrust generated in the second piston 34 is smaller than the thrust generated in the first piston 14, and the pressure is reduced by the regulator 64. By controlling, it is not necessary to control the thrust generated in the second piston 34. Therefore, even if the regulator 64 is not provided for thrust control, the same effect as that of the first embodiment can be obtained, and the number of parts can be reduced.

In addition, you may change each said embodiment as follows.
In the first and second embodiments, the rodless cylinder may be embodied as a rodless cylinder other than the magnet type rodless cylinder. For example, the present invention may be embodied in a chain type, slit type, wire type rodless cylinder, or the like.

In the first and second embodiments, a rodless cylinder that uses a liquid as a fluid may be used.
In the second embodiment, the attachment / detachment mechanism may be other than the magnets M1 and M2. For example, the attachment / detachment mechanism may be configured by providing a fitting member on the opposing surfaces of the sliders 54 and 55. In this case, the first slider 54 and the second slider come into contact with each other so that the fitting member is fitted. Further, the fitting may be released by applying a pressure exceeding the fitting force of the fitting member to the second piston 34.

  -In 2nd Embodiment, you may provide a magnet only in one slider. In this case, a metal or the like that is attracted by the magnetic attractive force is provided at a position corresponding to the magnet in the other slider.

  In the first embodiment, as shown in FIG. 5, the outer diameter and inner diameter of the second cylinder tube 31 are made smaller than the outer diameter and inner diameter of the first cylinder tube 11, and the second piston 34 is replaced with the first piston 14. The pressure receiving area of the second piston 34 may be smaller than that of the first piston 14. If comprised in this way, even if the pressure of the air which acts on both pistons 14 and 34 is the same, the thrust which generate | occur | produces in the 2nd piston 34 becomes smaller than the thrust which generate | occur | produces in the 1st piston 14. Then, when the thrust generated in the second piston 34 becomes smaller than the thrust generated in the first piston 14, the second slider 55 stops at the intermediate position. That is, the thrust control means and the intermediate position stop mechanism are to make the inner diameter of the second cylinder tube 31 smaller than the inner diameter of the first cylinder tube 11 and to make the second piston 34 smaller than the first piston 14. According to this, even if there is no regulator 64, the same effects as those of the first embodiment can be obtained.

  M1, M2: Magnets as attachment / detachment mechanism and intermediate position stop mechanism, 1, 2 ... Magnet type rodless cylinder as rodless cylinder, 10 ... First cylinder, 11 ... First cylinder tube, 14 ... First piston, 24 ... Rod constituting intermediate position stopper, 25 ... Stop member constituting intermediate position stopper, 30 ... Second cylinder, 31 ... Second cylinder tube, 34 ... Second piston, 51 ... Connecting member, 54 ... First Slider 55 ... second slider 64 ... intermediate position stop mechanism and regulator as thrust control means.

Claims (4)

A first cylinder in which a first piston moving by supply and discharge of fluid is accommodated in a first cylinder tube;
A second cylinder in which a second piston that is moved by supply and discharge of fluid is accommodated in a second cylinder tube;
A first slider that moves following the first piston and a second slider that moves following the second piston are connected to each other in parallel by a connecting member and outside the first and second cylinder tubes. Is disposed, and the first slider is disposed closer to one end in the axial direction of both cylinders than the second slider,
The first slider and the second slider are movable when pressed against each other,
An intermediate position stopper for stopping the first piston at an intermediate position between both stroke ends of the first cylinder is provided in the first cylinder tube so as to enter and exit the first cylinder tube.
The rodless cylinder further comprises an intermediate position stop mechanism that stops the second slider at the intermediate position when the first slider stops when the first piston stops by the intermediate position stopper. .   2. The rodless cylinder according to claim 1, wherein the intermediate position stop mechanism is a thrust control unit that makes a thrust generated in the second piston smaller than a thrust generated in the first piston.   The rodless cylinder according to claim 1, wherein the intermediate position stop mechanism is an attachment / detachment mechanism that allows the first slider and the second slider to be attached / detached.   The rodless cylinder according to claim 3, wherein the attachment / detachment mechanism is a magnet.

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