Cylinder device

Abstract

To provide a cylinder device that does not require preparation of a power supply environment and is capable of detecting the position of a piston.SOLUTION: A cylinder device 40 is provided with a shaft member 5 that moves up and down in a direction of a centerline C by means of pressurized oil, compressed air, or the like. The up-and-down motion of the shaft member 5 is converted into motion in a core axis direction c1, which is a radial direction of the centerline C, to operate an autonomous power generation device. A displacement portion having a radial distance from the centerline C that changes depending on a shape such as a taper, a hole, a recess, or a groove is provided, and the displacement portion is moved in response to the movement of the shaft member 5. When the displacement portion faces a probe portion 11 of the autonomous power generation device, motion in the core axis direction c1 of the core is generated.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a cylinder device for detecting the position of a piston.

Background Art

[0002] Cylinder devices are applied to various uses such as clamping devices and pressure detection devices. For example, in the case of a clamping device, a clamping object such as a workpiece, a mold, or a tool is fixed to a table or a robot hand by operating a piston. Release and lock operations are performed according to the position of the piston. Clamping failure occurs when the piston is not in a position between the release position and the lock position. A cylinder device is provided with a mechanism for detecting the position of these pistons as an operating state. For example, according to the cylinder device disclosed in Patent Document 1, a passage that is closed and a passage that is opened are provided according to the position of the piston, and compressed air is supplied to the passage to detect the position of the piston according to the passage state. Further, a technique for installing a coil and a magnet in a cylinder device and changing the overlapping distance between the coil and the magnet according to the moving position of the piston to detect the operating state of the cylinder device as a change in the inductance of the coil is shown in, for example, Patent Document 2.

[0003] In a cylinder device that uses compressed air for detecting an operating state, it is necessary to arrange the installation of a compressed air source, the handling of compressed air, and the power supply environment for the compressed air source. Further, in a technique that uses a change in inductance for detecting an operating state, it is necessary to arrange the power supply environment for the cylinder device so that current can be supplied to the coil.

[0004] As a device that generates current independently without a power source and without being connected to external electrical wiring and transmits mechanical fluctuations to the outside, self-powered generators as exemplified in Patent Documents 3 to 5 are known. As shown in any of the patent documents, a very small wireless radio is arranged in the vicinity of the self-powered generator. A series of operations in which the power generated by mechanical fluctuations is supplied to the wireless radio and the wireless radio wirelessly transmits the occurrence of mechanical fluctuations are performed in cooperation.

[0005] According to the technologies of Patent Documents 3 and 4, a magnetic circuit passing through a central opening of an excitation coil, and upper and lower operating pieces respectively connected to upper and lower poles of a permanent magnet are disclosed. Both ends of the magnetic circuit are arranged between the upper and lower operating pieces. By swinging the upper and lower operating pieces, one end of the magnetic circuit comes into contact with the upper operating piece, and the other end of the magnetic circuit comes into contact with the lower operating piece at a first extreme position, and the other end of the magnetic circuit comes into contact with the upper operating piece, and one end of the magnetic circuit comes into contact with the lower operating piece at a second extreme position. By varying the positions, the direction of the magnetic flux of the magnetic circuit is varied. A wireless module is operated by the electrical energy generated by the excitation coil to perform wireless transmission. According to the technology of Patent Document 5, magnetic conductive plates are respectively attached to both poles of a permanent magnet, the iron core of a coil is arranged to face one of the magnetic conductive plates, and the magnetic conductive plates facing the iron core of the coil are arranged with the S-pole one and the N-pole one swapped up and down to vary the direction of the magnetic flux of the iron core.

[0006] The self-powered generator is not a device such as a rotary generator that generates electricity when a continuous rotational motion is applied as a mechanical variation, but captures mechanical variations that occur instantaneously and intermittently and generates electricity instantaneously. Since the power generation amount of the self-powered generator depends on the change in magnetic flux, in the technologies of each patent document, a device has been devised to further accelerate the variation speed of external mechanical variations using an elastic body to increase the change amount of magnetic flux.

[0007] As such a device, in the technologies of Patent Documents 3-4, mechanical variations are accelerated by temporarily storing external mechanical variations in an elastic body and then releasing them all at once. For example, in Patent Document 3, a leaf spring is used as such an elastic body, in Patent Document 4, a spring element is used, and in Patent Document 5, an elastic piece is used.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Disclosure of the Invention

Problems to be Solved by the Invention

[0009] In the technologies of the self-powered generators of Patent Documents 3 and 4, the magnetic circuit and the permanent magnet change their relative positions with respect to external mechanical fluctuations by swinging around a predetermined rotation axis.

[0010] Also, in the technology of the self-powered generator of Patent Document 5, a permanent magnet is movably installed between two chute panels with chutes extending vertically on opposite surfaces, and the permanent magnet is linearly moved up and down along the chute to change the relative positions of the magnetic circuit and the permanent magnet with respect to external mechanical fluctuations. However, in this technology, the magnetic circuit including the permanent magnet does not form a closed loop by the magnetic conductive plate, and the magnetic flux density passing through the magnetic conductive plate is low.

[0011] And the technologies of the self-powered generators of Patent Documents 3 to 5 move the entire magnetic circuit side or the entire permanent magnet side, and since the mass to be moved is large, there is a limit to increasing the acceleration of mechanical fluctuations even if the elastic force stored in the elastic body is used, and no electromotive force can be expected. Moreover, these are assumed to be used as switches operated by natural persons. The cylinder device includes a piston and a shaft member. The shaft member is moving up and down, and in such a movement, the conventional self-powered generator cannot be operated.

[0012] In addition, in a cylinder device, it is necessary to detect various positions such as the release position, lock position, and position that can be regarded as a clamping failure of the shaft member, like in a clamp device. It is difficult to install a self-power generation device at each location within the limited size range of the cylinder device.

[0013] An object of the present invention is to provide a cylinder device that can detect the position of a piston without the need to arrange a compressed air source, handle compressed air, or provide a power supply environment for the compressed air source or coil by using a self-power generation device for detecting the position of the piston.

Means for Solving the Problems

[0014] The cylinder device of the present invention includes a shaft member that moves up and down in the direction of the center line C by means of pressure oil, compressed air, or the like. The up-and-down movement of the shaft member is converted into movement in the core axis direction c1, which is the radial direction of the center line C, to operate a self-power generation device. Then, a displacement portion is provided whose distance in the radial direction of the center line C changes due to shapes such as a taper, hole, concave portion, groove, etc., and the displacement portion is moved in correspondence with the movement of the shaft member. Further, when the displacement portion faces the probe portion of the self-power generation device, movement in the core axis direction c1 of the core is generated.

Effects of the Invention

[0015] According to the cylinder device of the present invention, the up-and-down movement of the shaft body is converted into movement that moves the core body in the core axis direction c1. Contact terminals are provided in front of and behind the core body respectively, and between both ends of a U-shaped magnetic flux path that overlaps with a gap, each contact terminal contacts from one side to the other side by linear movement, so that the direction of the magnetic flux passing through the center of the coil of the coil unit can be reversed without magnetic flux leakage.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

BEST MODE FOR CARRYING OUT THE INVENTION

[0017] First, the self - generating power device applied to the cylinder device of the present invention will be described. In FIG. 1A, the self - generating device 1 includes a magnet unit 13 fixed to a housing 2 with bolts 23, and a coil unit 12 movable in the core axis direction c1 by a probing part 11 made of balls. The magnet unit 13 includes a permanent magnet 14, an upper magnetic flux path 15 and a lower magnetic flux path 16 made of a soft magnetic material. Magnetic flux paths of the soft magnetic material are provided for the upper and lower magnetic poles of the permanent magnet 14 respectively. The two magnetic flux paths 15, 16 are U - shaped in side view with the permanent magnet 14 sandwiched therebetween, and are arranged such that one magnetic flux path 15 overlaps inside and the other magnetic flux path 16 overlaps outside with a gap therebetween. Both ends of the magnetic flux path 15 become pole pieces 15a, 15b, and both ends of the magnetic flux path 16 become pole pieces 16a, 16b.

[0018] The coil unit 12 has a core 17, a coil 19 wound around the outer periphery of the core 17 via a bobbin 19a, and ring - shaped contact terminals 21, 22 sandwiching the coil 19. The pole piece 15a and the pole piece 16a face each other as a pair on the front side of the coil 19, and the pole piece 15b and the pole piece 16b face each other as a pair on the rear side of the coil 19. The core 17 has a front end portion 17a on the front side (right in the figure) in the core axis direction c1, a core body 17b in the center, and a rear end portion 17c on the rear side (left in the figure), and is cylindrical with the core axis direction c1 aligned with the radial direction of the center line C. Hereinafter, in the drawings, the right side in the core axis direction c1 is referred to as the front side, and the left side is referred to as the rear side. The length of the core 17 in the core axis direction c1 is mostly the core body 17b, and the coil 19 is wound around the outer periphery of the core body 17b. Although not obvious in the figure, the bobbin 19a is adhesively fixed to the magnetic flux path 15. The core body 17b and the coil 19 are not fixed, and the core body 17b can move in the core axis direction c1 via the hollow of the bobbin 19a which is the center of the coil 19.

[0019] The core body 17b is made of a soft magnetic material. The front end portion 17a and the rear end portion 17c may be made of a soft magnetic material or a non - magnetic material. However, when these are made of a soft magnetic material, it is necessary to provide a gap so as not to be magnetically short - circuited with the upper and lower magnetic flux paths 15, 16.

[0020] The core body 17b, the front end portion 17a, and the core body 17b and the rear end portion 17c are provided with a convex portion a and a concave portion b so as to fit into each other. And, on the outer peripheral surfaces between the core body 17b and the front end portion 17a and between the core body 17b and the rear end portion 17c, sliding surfaces 17d and 17e whose diameters are reduced more than those of other outer peripheries at a distance d are provided. The contact terminals 21 and 22 are soft magnetic, and each is fitted on the outer periphery of the sliding surfaces 17d and 17e. The contact terminals 21 and 22 can move freely within a range of the distance d in the core axis direction c1 on the sliding surfaces 17d and 17e. The large-diameter portion of the core body 17b, the front end portion 17a, and the rear end portion 17c restrict the movement of the contact terminals 21 and 22 beyond the distance d. The two contact terminals 21 and 22 are always in contact with the corresponding sliding surfaces 17d and 17e, and magnetic flux passes through without a magnetic gap between the core body 17b and the contact terminals 21 and 22.

[0021] The front end portion 17a of the core 17 is in contact with the detecting portion 11. When the movement in the radial direction of the center line C from the detecting portion 11 is transmitted to the core 17, the rear end portion 17c of the core 17 moves in the core axis direction c1 with respect to the magnet unit 13.

[0022] FIG. 2 is a view for taking out the coil unit 12 and the contact terminals 21 and 22 and explaining the details thereof. In the figure, the coil 19 (and the bobbin 19a) is shown by a broken line. When the front end portion 17a and the rear end portion 17c of the core 17 are removed from the core body 17b, the contact terminals 21 and 22 can be removed from the sliding surfaces 17d and 17e. The front end portion 17a has an input end p that abuts against the detecting portion 11, a first base portion q having a larger diameter than the sliding surface 17d, and a concave portion b that fits with the convex portion a of the core body 17b. The rear end portion 17c has a pedestal portion r that abuts against the elastic body 18, a second base portion s having a larger diameter than the sliding surface 17e, and a concave portion b (FIG. 2) that fits with the convex portion a of the core body 17b. The contact terminals 21 and 22 are cylindrical with a height h, and the height h is shorter than the distance d. Each of the contact terminals 21 and 22 has contact surfaces 21a, 21b and contact surfaces 22a, 22b perpendicular to the core axis direction c1 on the front and back, respectively.

[0023] FIG. 3 is a diagram showing the relationship between the magnet unit 13 and the core 17. The magnet unit 13 sandwiches the permanent magnet 14 between the upper and lower magnetic flux paths 15 and 16 and is fixed to the housing 2 by bolts 23. The upper and lower magnetic flux paths 15 and 16 are formed by bending a plate material into a U shape. The pole pieces 15a, 15b, 16a, and 16b, which are the ends of the respective upper and lower magnetic flux paths 15 and 16, are arranged at intervals from the core body 17b, the front end portion 17a, and the rear end portion 17c. Moreover, this is to prevent contact during the process before, during, or after the core body 17b, the front end portion 17a, and the rear end portion 17c are pushed by the probe portion 11 or the elastic body 18 and move, and to prevent the formation of a magnetic flux path.

[0024] The magnetic poles of the permanent magnet 14 appear on the pole pieces 15a and 16b of the upper and lower magnetic flux paths 15 and 16. The pole pieces 15a, 15b of the upper magnetic flux path 15 and the pole pieces 16a, 16b of the lower magnetic flux path are arranged in parallel with a gap t therebetween. The front and back contact surfaces 21b, 21a of the contact terminal 21 can respectively come into contact with the pole pieces 15a, 16a. The front and back contact surfaces 22a, 22b of the contact terminal 22 can respectively come into contact with the pole pieces 15b, 16b. The pole pieces 15a, 15b, 16a, and 16b are provided with arc-shaped notches x to increase the contact area with the contact terminals 21 and 22. When the contact terminals 21 and 22 slide on the sliding surfaces 17d and 17e, the contact terminals 21 and 22 come into contact with the pole pieces 15a, 15b, 16a, and 16b and are blocked from sliding, so the range within which the contact terminals 21 and 22 can move is within this gap t.

[0025] Figure 4 shows the operation of the self - generating device 1. The rear end portion 17c of the core 17 of the self - generating device 1 is brought into contact with an elastic body 18 which is a compression spring, and the elastic body 18 is housed in a spring chamber 24. The elastic body 18 accumulates elastic force by the core 17 moving rearward in the core axis direction c1, and the elastic force stored in the elastic body is utilized as a force to push the core 17 forward. Note that the mechanism for pushing the core 17 forward is not limited to the elastic body 18, and a mechanism that supplies pressure oil, compressed air, etc. to an operating chamber and pushes it forward by that pressure, as shown in the first embodiment described below, may also be used. In Fig. 4A, the pole piece 15b behind the upper magnetic flux path 15, the contact terminal 22, the core body 17b, the contact terminal 21, and the pole piece 16a in front of the lower magnetic flux path 16 are magnetically short - circuited to form a magnetic circuit φ1. The magnetic circuit φ1 is a path that makes a complete loop without any leakage in the middle.

[0026] Fig. 4B shows a state where the core 17 is moving rearward in the core axis direction c1. The contact terminals 21 and 22 are respectively pushed by the front end portion 17a and the large - diameter portion of the core body 17b, and the pole piece 15b behind the upper magnetic flux path 15 starts to separate from the contact terminal 22, the contact terminal 21, and the pole piece 16a in front of the lower magnetic flux path 16, and a gap g is generated. And the moving speed v1 of the core 17 and the contact terminals 21 and 22 moving until this time is the moving speed of the detecting portion 11. The magnetic force between the pole piece 15b behind the upper magnetic flux path 15 and the contact terminal 22, and the magnetic force between the contact terminal 21 and the pole piece 16a in front of the lower magnetic flux path 16 weaken.

[0027] In Fig. 4C, at the moment when the magnetic force between the pole piece 16b behind the lower magnetic flux path 15 and the contact terminal 22, and the magnetic force between the contact terminal 21 and the pole piece 15a in front of the upper magnetic flux path 15 become dominant, the contact terminals 21 and 22 disengage from the state of the moving speed v1 and are accelerated on the sliding surfaces 17d and 17e and collide with the pole piece 15a and the pole piece 16b respectively. Note that Figs. 4B and 4C show the states before and after the contact terminals 21 and 22 are suddenly accelerated and move while the core 17 has hardly moved.

[0028] In FIG. 4C, as is clear, the rear ends of the sliding surfaces 17d and 17e are designed such that the distance d between the sliding surfaces 17d and 17e is set to move to the positions of the pole pieces 16b on the rear side of the lower magnetic flux path 16 and the positions of the pole pieces 15a on the front side of the upper magnetic flux path 15 or beyond them, respectively. In this state, the pole piece 15a on the front side of the upper magnetic flux path 15, the contact terminal 21, the core body 17b, the contact terminal 22, and the pole piece 16b on the rear side of the lower magnetic flux path 16 are magnetically short-circuited to form a magnetic circuit φ2. The magnetic circuit φ2 is also a path that circulates without any leakage in the middle. Focusing on the core body 17b, the direction of the magnetic flux passing through the core body 17b is opposite between the magnetic circuit φ1 and the magnetic circuit φ2. By instantaneously switching from the magnetic circuit φ1 to the magnetic circuit φ2, the amount of change in the magnetic flux is large.

[0029] FIG. 5 is an explanatory diagram regarding the performance evaluation of the self-power generation device 1. FIG. 5A shows a test circuit 200 for evaluation. FIG. 5B shows the result of measuring the electromotive force of the self-power generation device 1' (see FIG. 1B) using the contact terminals 21' and 22'. The contact terminals 21' and 22' have a configuration in which the contact terminals 21 and 22 of the self-power generation device 1 are replaced, and are different only in that they are fixed to the core body 17b unlike the movable contact terminals 21 and 22, and the other configurations are the same as those of the self-power generation device 1. In the self-power generation device 1', the contact terminals 21' and 22' cannot move independently from the core body. FIG. 5C shows the result of measuring the electromotive force of the self-power generation device 1 in which the contact terminals can move independently from the core body..

[0030] In the self-power generation device 1' of FIG. 5B, the peak of the electromotive force is around 10 msec (0.01 seconds), while in the self-power generation device 1 of FIG. 5C, it is around 4 msec (0.004 seconds), and the response speed of FIG. 5C is faster. And it can be observed that the electromotive force also increases from about 2 V to about 8 V.

[0031] Even in the self - generating device 1' of Fig. 5B, there is an attracting effect on the core 17 due to the magnetic force from the pole pieces 15a and 16b. However, the mass of the entire core is large, and it cannot be greatly accelerated from the moving speed of the detecting part 11, so the response speed is considered to be slow. On the other hand, in the self - generating device 1 of Fig. 5C, the masses of the contact terminals 21 and 22 moving on the sliding surfaces 17d and 17e are extremely small compared to the entire core 17. Since the acceleration of the contact terminals 21 and 22 is large, the change in the magnetic flux passing through the coil 19 (passing through the core body 17b) becomes large and the electromotive force increases. In addition, the fact that the contact terminals 21 and 22 are not affected by the elastic force on the front side in the core axis direction c1 from the elastic body 18 also contributes to the increase in acceleration.

[0032] As described above, in the self - generating device 1, the linear motion by the detecting part 11 can be directly utilized as the movement of the core body 17b. Also, the masses of the contact terminals 21 and 22 are extremely small compared to the core 17, and the acceleration can be increased, so the response speed is fast. Further, by increasing the response speed, the change in the magnetic flux passing through the coil 19 becomes large, and there is an effect that the electromotive force can be increased. Also, by using the two moving contact terminals 21 and 22, the magnetic circuits φ1 and φ2 are closed loops, so the magnetic flux passing through the coil 19 can be increased. On the other hand, in the self - generating device 1', although the magnetic flux cannot be increased more than that of the self - generating device 1, since the entire core is a closed loop, the leakage of the magnetic flux generated by the linear motion can be reduced and passed through the coil 19.

[0033] [Overview of Each Embodiment] The cylinder device includes a shaft member that moves up and down in the direction of the center line C by pressure oil, compressed air, or the like. The up - and - down movement of the shaft member is converted into the movement in the core axis direction c1, which is the radial direction of the center line C, to operate the self - generating device. And in each embodiment, a displacement part is provided whose distance in the radial direction of the center line C changes due to shapes such as a taper, a hole, and a concave groove, and the displacement part is moved corresponding to the movement of the shaft member. Then, when the displacement part faces the detecting part of the self - generating device, the movement of the core in the core axis direction c1 is generated.

[0034] In the cylinder devices according to the embodiments, there are size limitations, and the self - power generation device cannot be installed anywhere within the up - and - down stroke range of the shaft member. The installable location is above the stroke range of the piston portion of the shaft member, and the number is limited to one. Regarding how the displacement portion corresponds to the movement of the shaft member in the events such as the locked state, release state, clamp failure, slip state, etc., there are differences in each embodiment. The following is a rough classification of each embodiment. Incidentally, a plurality of self - power generation devices may be installed in the cylinder device of each embodiment. Also, in the cylinder device of each embodiment, instead of providing the self - power generation device on the flange portion, a self - power generation measure may be provided at other locations such as inside the lower wall of the cylinder device with an increased height dimension.

[0035] 1) Those in which the displacement portion and the shaft member move in an integrated manner The first embodiment, the third embodiment, and the fourth embodiment described below fall under this category. In the first embodiment and the third embodiment, the displacement portion is provided on the shaft member itself. In the fourth embodiment, although it is not the shaft member itself, a sleeve that operates almost integrally when the shaft member descends surrounds the shaft member, and the displacement portion is provided on the sleeve.

[0036] 2) Those provided with a sleeve that surrounds the shaft member and moves up and down, and the displacement portion is provided on the sleeve The second embodiment and the fifth embodiment described below fall under this category. The displacement portion is provided on the sleeve. A predetermined first range for interlocking the movement of the sleeve and the shaft member is defined within the up - and - down movement range of the shaft member. In the second embodiment, a stepped portion is provided on the shaft member, and in the first range, the sleeve is engaged and lowered. When lowered, the sleeve rises due to the elastic force of the stored elastic body. In the fifth embodiment, two stepped portions are provided on the shaft member vertically. When the shaft member descends, the sleeve is engaged with the upper stepped portion in the first range and lowered. When the shaft member rises, the sleeve is engaged with the lower stepped portion in the second range and raised.

[0037] 3) Those provided with a sleeve that surrounds the shaft member and swings about the center line C, and one or more displacement portions are provided on the sleeve The sixth and seventh embodiments described below are applicable. A mechanism for converting the vertical movement of the shaft member into a turning movement is provided to turn the sleeve. Since the sleeve aligns the rotational position corresponding to the vertical position of the shaft member with the probe portion, one or more displacement portions are provided so that the timing for operating the self - power generation device can be set one or more times.

[0038] [First Embodiment] FIG. 6A shows a cross - section of a cylinder device 40 equipped with a self - power generation device 1. The cylinder device 40 is provided with a shaft member 5 that moves vertically. The self - power generation device 1 is installed in the cylinder device 40 together with a wireless module 101.

[0039] The shaft member 5 has a shaft body 5a formed in order from the upper side, a piston portion 5b having a larger diameter than the shaft body 5a, and a lower shaft 5c on the lower side. In the cylinder device 40, pressure oil, compressed air, or the like is supplied to a cylinder hole 3 drilled in a housing 2 to move the piston portion 5b up and down. The cylinder hole 3 is a space formed inside a barrel wall 2c extending in the vertical direction between a ceiling portion 2a, a bottom portion 2b, and the barrel wall 2c. When pressure oil, compressed air, or the like is supplied to a chamber 3a above the piston portion 5b, the piston portion 5b descends, and when pressure oil, compressed air, or the like is supplied to a chamber 3b below, the piston portion 5b ascends.

[0040] A cylindrical hole 4 formed in the ceiling portion 2a of the housing 2 surrounds the shaft body 5a, and a part of the shaft member 5 penetrates the ceiling portion 2a and extends outside the housing 2. The shaft member 5 is rotatable around a center line C and movable in the vertical direction (the direction of the center line C). A guide groove 6 is provided on the outer wall of the lower shaft 5c. The guide groove 6 has a turning groove 6a and a straight groove 6b in order from the lower side. A ball 7 is inserted into the guide groove 6. Thus, when the shaft member 5 moves in the vertical direction, the ball 7 is guided along the turning groove 6a, and the shaft member 5 moves in the vertical direction while turning. Also, when the ball 7 is guided along the straight groove 6b, the shaft member 5 moves linearly in the vertical direction.

[0041] In the middle of the height of the shaft body 5a, a tapered displacement portion 8 is provided. On the other hand, an opening 9 perpendicular to the center line C is drilled in the peripheral wall surface of the cylindrical hole 4. The drilling position of the opening 9 is within the range where the displacement portion 8 moves when the shaft body 5a moves up and down. A detecting portion 11 in the form of a ball is fitted into the opening 9 and protrudes. When the displacement portion 8 faces the opening 9 at a predetermined position and the detecting portion 11 overlaps and rides on the displacement portion 8, the vertical movement of the shaft body 5a is converted into a movement in a direction perpendicular to the center line C (c1 direction, the radial direction of the center line C). The displacement portion 8 is tapered. The detecting portion 11 is used to detect the opening 9.

[0042] The movement of the detecting portion 11 is transmitted to the front end portion 17a of the core 17 of the self - power generation device 1. The self - power generation device 1 converts the kinetic energy of the detecting portion 11 into electrical energy and supplies power to the wireless module 101 to drive it. The wireless module 101 wirelessly transmits a signal indicating that it has ridden up.

[0043] Also, the rear end portion 17c of the core 17 of the self - power generation device 1 is in contact with an elastic body 18 which is a compression spring at the rear side. The elastic body 18 is housed in the spring chamber 24, and the elastic force is accumulated in the spring chamber 24 by the core 17 moving in the core axis direction c1. The elastic force stored in the elastic body is used as a force to push the core forward when the shaft body 5a descends and the detecting portion 11 descends from the displacement portion 8.

[0044] According to the cylinder device 40 of the first embodiment, the condition for the self - power generation device 1 to generate power can be determined by the position of the displacement portion 8 provided in the middle of the height of the shaft body 5a. According to the first embodiment, by riding on the displacement portion 8, the vertical movement of the shaft body 5a is converted into a movement in a direction perpendicular to the center line C (c1 direction, the radial direction of the center line C). Therefore, when the piston portion 5b rises, the self - power generation device 1 can operate the wireless module 101 and notify the outside by a wireless signal.

[0045] Incidentally, when the probing unit 11 rides on the displacement unit 8, a change in magnetic flux occurs in the core 17 of the self - power generation device 1 whether the probing unit 11 is moving down on the displacement unit 8 or up. However, the direction of the magnetic flux is in the reverse direction, and the polarities of the generated voltages are different. Therefore, the wireless module 101 may wirelessly emit different signals based on the voltage polarities to notify the outside in which direction the change has occurred. Alternatively, the same signal may be wirelessly emitted even if the polarities of the generated voltages are different. In this case, since it cannot be distinguished only by the wireless signal of the wireless module 101, the cylinder device 40 determines whether it is in the release position or the lock position based on either the condition of whether it is in the operation process of moving to the release position or the operation process of moving to the lock position.

[0046] Also, in the self - power generation device 1, the force that pushes the core 17 forward uses the biasing force of the elastic body 18. However, instead of the biasing force of the elastic body 18, pressure such as hydraulic oil or compressed air may be used. FIG. 6B shows this modification as another embodiment. The spring chamber 24 where the elastic body 18 is mounted is changed to an operation chamber 25 to which hydraulic oil or compressed air is supplied, and the rear end portion 17c is changed to a piston 27. The piston 27 is moved forward in the c1 direction by the pressure of hydraulic oil or compressed air supplied to the operation chamber to push the core body 17b. In this case, the hydraulic oil or compressed air supplied to the operation chamber 25 may be supplied through the flow path 26 in communication with the chamber 3a above the piston portion 5b within the cylinder hole 3. Thus, when hydraulic oil or compressed air is supplied to the chamber 3a, it is also supplied to this operation chamber 25 through the flow path 26 from the chamber 3a. Therefore, at the timing when it is desired to operate the core body 17b forward in the core axis direction c1, hydraulic oil or compressed air is supplied to the operation chamber 25, and the hydraulic oil or compressed air can accurately operate the core body 17b.

[0047] [Second Embodiment] In the cylinder device 40 of the first embodiment, the self - power generation device 1 operates when the shaft member 5 is in the raised position. However, in the cylinder device 50 of the second embodiment, the self - power generation device 1 operates when the shaft member 5 is in the lowered position.

[0048] In FIG. 7, the same components as those of the cylinder device 40 in FIG. 6 are denoted by the same reference numerals and the description thereof is omitted. In the drawing, the range within which the shaft member 5 strokes is indicated by ST. This range indicates the vertical movement range of the shaft member 5 between the positions marked with "*" in the drawing. The cylinder device 50 is provided with a link clamping mechanism 30 composed of links 30a and 30b at the tip of the shaft member 5, and can clamp the workpiece W at the action point 30c.

[0049] The shaft member 5 has a shaft body 5a formed in order from the upper side and a piston portion 5b having a larger diameter than that of the shaft body 5a. A stepped portion 5d is provided in the middle of the length of the shaft body 5a, and the diameter of the shaft body 5a is larger on the upper side of the stepped portion 5d than on the lower side.

[0050] A sleeve 51 is externally fitted on the outer periphery of the shaft body 5a on the upper side of the stepped portion 5d. The sleeve 51 is surrounded by the cylindrical hole 4. The lower end 51a of the sleeve 51 has a reduced diameter and is engaged with the stepped portion 5d. The upper end 51b of the sleeve 51 has its movement range restricted by the ceiling portion 2a of the housing 2. That is, even if the shaft body 5a rises, if the upper end 51b of the sleeve 51 abuts against the ceiling portion 2a of the housing 2, the sleeve 51 can no longer rise, and only the shaft body 5a rises.

[0051] A displacement portion 53 is provided on the outer periphery in the middle of the height of the sleeve 51. An opening 9 is drilled in the range where the displacement portion 53 moves. The detection portion 11 in the opening 9 detects the displacement portion 53 and protrudes from the opening 9. When the opening 9 faces the displacement portion 53 and the detection portion 11 overlaps the displacement portion 53, the vertical movement of the shaft body 5a is converted into movement in a direction perpendicular to the center line C (c1 direction, the radial direction of the center line C). The sleeve 51 is biased upward by an elastic body 55 having a fixed end 54 provided on the housing 2 side as a base end.

[0052] In FIG. 7, the piston portion 5b of the cylinder device 50 is descending, and the link clamp mechanism 30 is in a state of releasing the workpiece W. The stepped portion 5d of the shaft body 5a is pushing down the sleeve 51, showing the state immediately after the probe portion 11 has disengaged from the concave displacement portion 43. That is, it is the state immediately after the self - power generation device 1 has operated the wireless module 101 to notify the outside by a wireless signal.

[0053] FIG. 8 shows the cylinder device 50 in an intermediate state of switching from the release state to the lock state, or in an intermediate state of switching from the lock state to the release state. The sleeve 51 is pushed up by the elastic body 32, and the probe portion 11 has fallen into the displacement portion 53. At the moment when the probe portion 11 overlaps with the displacement portion 53, the self - power generation device 1 can operate the wireless module 101 to notify the outside by a wireless signal.

[0054] FIG. 9 shows the cylinder device 50 in the locked state. The sleeve 51 cannot rise, and only the shaft body 5a has risen. The probe portion 11 has fallen into the displacement portion 53. Therefore, the range in which the sleeve 51 engages with the stepped portion 5d and descends in conjunction is the lower first range ex11 within the range ST of the stroke of the shaft member 5, and this range corresponds to the distance ex1 between the upper end 51b of the sleeve 51 and the ceiling portion 2a in FIG. 7.

[0055] According to the cylinder device 50 of the second embodiment, since the probe portion 11 in the opening 9 overlaps with the displacement portion 53, the vertical movement of the shaft body 5a is converted into a movement in the direction perpendicular to the center line C (c1 direction, the radial direction of the center line C). Therefore, when the piston portion 5b is at the descending position, the self - power generation device 1 can operate the wireless module 101 to notify the outside by a wireless signal.

[0056] [Third Embodiment] The cylinder device 60 of the third embodiment is a cylinder device used for pressure detection. The same components as those of the cylinder device 40 in FIG. 6 are denoted by the same reference numerals and the description thereof is omitted. The cylinder device 60 includes a safety valve 61, adjusting screws 64a and 64b, and a spring seat 62. The spring seat 62 defines the position of the other end of the elastic body 18. The cylinder hole 3 communicates with a path P through which a fluid whose pressure is to be detected flows.

[0057] A hole-shaped displacement portion 68 is provided in the middle of the height of the shaft body 5a. On the other hand, an opening 9 perpendicular to the center line C is drilled in the peripheral wall surface of the cylinder hole 4. When the probing portion 11 protruding from the opening 9 overlaps with the displacement portion 68, the vertical movement of the shaft body 5a is converted into a movement in the direction perpendicular to the center line C (c1 direction, radial direction of the center line C).

[0058] The biasing force of the elastic body 18 can be adjusted by the adjusting screws 64a and 64b and the spring seat 62. The piston portion 5b receives the pressure of the fluid in the path P, but even if it tries to move upward, the probing portion 11 cannot be pushed into the right side in the c1 direction unless it exceeds the biasing force of the elastic body 18 (FIG. 10A). On the other hand, when the pressure of the fluid in the path P exceeds the biasing force of the elastic body 18, the probing portion 11 can be pushed into the right side in the c1 direction (FIG. 10B). At this time, the self-power generation device 1 can operate the wireless module 101 to notify the outside by wireless signal that the specified pressure has been exceeded.

[0059] [Fourth Embodiment] The cylinder device 70 of the fourth embodiment is a cylinder device used for the application of a clamping device. In FIG. 11, the same components as those of the cylinder device 40 in FIG. 6 are denoted by the same reference numerals, and the description thereof is omitted. The cylinder device 70 has a grip member 71 that engages with a hole Wh provided in a workpiece W, and a tapered shaft portion 5e inserted into the grip member 71. The tapered shaft portion 5e is a part of the shaft member 5, and the shaft member 5 includes a shaft body 5a and a piston portion 5b, similar to the second and third embodiments. The shaft body 5a, the piston portion 5b, and the tapered shaft portion 5e of the shaft member 5 move up and down integrally. Further, the lower end of the grip member 71 abuts against a sleeve 72 that surrounds the shaft member 5. The sleeve 72 is surrounded by the peripheral surface of the cylindrical hole 4. When the grip member 71 descends, the sleeve 72 also descends, and when the sleeve 72 ascends, the grip member 71 also ascends.

[0060] When pressure oil, compressed air, or the like is supplied to the upper chamber 3a of the cylinder hole 3, the piston portion 5b descends and the sleeve 72 ascends. When pressure oil, compressed air, or the like is supplied to the lower chamber 3b of the cylinder hole 3, the piston portion 5b ascends. By lowering the piston portion 5b and attracting the shaft member 5 toward the seating surface ss side, the tapered shaft portion 5e expands the diameter of the grip claws 71a and engages them with the inner peripheral surface of the hole Wh, and then by attracting the grip member 71 further toward the seating surface ss side, the workpiece W is fixed. At this time, if the engagement of the grip member 71 with the hole Wh is performed normally, the grip member 71 does not descend in conjunction with the attraction. Even if the grip member 71 descends slightly, when it is in the release state, it is pushed up by the piston portion 5b and returns to the original position.

[0061] FIG. 11A shows the state before the attraction by the grip member 71, and FIG. 11B shows the state where the workpiece W is clamped by the attraction. When pressure oil, compressed air, or the like is supplied to the upper chamber 3a, the piston portion 5b descends and the chamber 3a expands.

[0062] Figure 12 shows that an attempt to clamp the workpiece W has failed and a slipping state has occurred. The slipping state occurs when the hole Wh of the workpiece W is larger than expected or when the gripping claw 71a is damaged. In such a case, the gripping member 71 slips without engaging with the hole Wh, and the piston portion 5b descends more than expected.

[0063] On the outer periphery in the middle of the height of the sleeve 72, a concave displacement portion 73 is provided. An opening 9 is drilled in the range where the displacement portion 73 moves. The probe portion 11 in the opening 9 converts the vertical movement of the shaft body 5a into a movement in a direction perpendicular to the center line C (c1 direction, radial direction of the center line C) by overlapping the displacement portion 73.

[0064] Since the gripping member 71 is not engaged with the hole Wh, the gripping member 71 and the sleeve 72 descend in conjunction with the descent of the piston portion 5b. When the probe portion 11 descends to a position overlapping the displacement portion 73, the self - power generation device 1 can operate the wireless module 101 to notify the outside by a wireless signal that a gripping failure has occurred.

[0065] Note that for the above - mentioned gripping member 71, the diameter expansion of the gripping claw 71a by the tapered shaft portion 5e was due to deflection, but it may also be configured as a mechanism that can move the gripping claw 71a left and right.

[0066] [Fifth Embodiment] The cylinder device 80 of the fifth embodiment is configured to be able to detect two positions with one self - power generation device 1. In FIG. 13, the same components as those of the cylinder device 40 in FIG. 6 are denoted by the same reference numerals and the description thereof is omitted. The cylinder device 80 includes a link clamping mechanism 30 composed of links 30a and 30b, and can clamp the workpiece W at the action point 30c. In the figure, the process of the shaft member 5 stroking is shown by the range ST. This range indicates the vertical movement range of the position marked with "*" on the shaft member 5 in the figure.

[0067] The shaft member 5 has a shaft body 5a formed in order from above and a piston portion 5b having a larger diameter than the shaft body 5a. A stepped portion 5d is provided in the middle of the length of the shaft body 5a, and the diameter of the shaft body 5a is larger on the upper side of the stepped portion 5d than on the lower side. A sleeve 81 is externally fitted on the outer periphery of the shaft body 5a. The cylindrical hole 4 surrounds the sleeve 81. The lower end 81a of the sleeve 81 has a reduced diameter and is configured to catch on the stepped portion 5d. The upper end 81b of the sleeve 81 has its movement range restricted by the ceiling portion 2a of the housing 2. That is, even when the shaft body 5a rises with the lower end 81a caught on the stepped portion 5d, if the upper end 81b of the sleeve 81 abuts against the ceiling portion 2a of the housing 2, the sleeve 81 can no longer rise further, and only the shaft body 5a rises.

[0068] A braking member 84 is attached to the outer periphery of the sleeve 81. The braking member 84 is a member that applies braking to the vertical movement of the sleeve 81 by elastic force, and for example, an O-ring, rectangular rubber, etc. can be used. A stepped portion 5f is further provided on the shaft member 5 below the stepped portion 5d. The stepped portion 5f also serves as the upper surface of the piston portion 5b. The lower end 81a of the sleeve 81 abuts against the stepped portion 5f when the piston portion 5b rises. If the lower end 81a of the sleeve 81 is caught on the stepped portion 5d, the sleeve 81 rises as the piston portion 5b rises regardless of the braking by the braking member 84.

[0069] A displacement portion 83 is provided on the outer periphery in the middle of the height of the sleeve 81. An opening 9 is drilled in the range where the displacement portion 83 moves. The probe portion 11 in the opening 9 converts the vertical movement of the shaft body 5a into movement in a direction perpendicular (c1 direction, radial direction of the center line C) to the center line C by falling onto the displacement portion 83.

[0070] In FIG. 13, the cylinder device 80 has the piston portion 5b descending, and the link clamp mechanism 30 is in a state of releasing the workpiece W. The stepped portion 5d of the shaft body 5a presses down the sleeve 81, showing the state immediately after the probe portion 11 has disengaged from the displacement portion 83. That is, it is the state immediately after the self - power generation device 1 has operated the wireless module 101 to reach the release position by a wireless signal and informed the outside of this fact.

[0071] Thereafter, in the intermediate state of switching from the release state to the lock state, the downward movement of the sleeve 81 is braked by the braking member 84, and the sleeve 81 is held at the position shown in FIG. 13.

[0072] FIG. 14A shows the cylinder device 80 in the locked state. It is the state immediately after the self - power generation device 1 has operated the wireless module 101 to reach the lock position by a wireless signal and informed the outside of this fact. The lower end 81a of the sleeve 81 abuts against the stepped portion 5f which is the upper surface of the piston portion 5b, and the sleeve 81 rises regardless of the braking by the braking member 84. It is the state immediately after the probe portion 11 has overlapped the displacement portion 83. From the state of FIG. 13 to the state of FIG. 14A, the sleeve 81 moves by a distance ex2 (see FIG. 13). When the lower end 81a of the sleeve 81 engages with the stepped portion 5f and the piston portion 5b has risen by a distance ex2, the probe portion 11 overlaps the displacement portion 83. In FIG. 14A, within the range ST in which the shaft member 5 strokes, the second range in which the sleeve 81 engages with the stepped portion 5f and moves is shown as ex22. It is the last position where the shaft member 5 ascends the stroke. Conversely, even from the state of FIG. 14A to the state of FIG. 13, the lower end 81a of the sleeve 81 engages with the stepped portion 5d and moves by a distance ex2. In FIG. 14A, within the process of the range ST, the first range in which the sleeve 81 engages with the stepped portion 5d and moves is shown as ex21. It is the last position where the shaft member 5 descends the stroke.

[0073] According to the cylinder device 80 of the fifth embodiment, the probing portion 11 in the opening 9 is converted into a movement in the direction perpendicular to the center line C (c1 direction, radial direction of the center line C) of the vertical movement of the shaft body 5a by falling onto the displacement portion 83. Therefore, when the piston portion 5b is at the lowered position and the raised position, the self - power generation device 1 can operate the wireless module 101 to notify the outside by wireless signals.

[0074] In the fifth embodiment, the probing portion 11 is disengaged from the displacement portion 83 at the release position, and the probing portion 11 is dropped onto the displacement portion 83 at the lock position. However, the vertical position of the displacement portion 83 may be changed so that the opposite is true.

[0075] Also, as the braking member 84, a retaining ring 84a made of spring steel may be used. In this case, as shown in FIG. 14B, a minute groove 4a is formed in the cylinder hole 4, and when the retaining ring 84a expands in diameter due to the elastic restoring force and fits into it, braking may be applied to the vertical movement of the sleeve 81.

[0076] [Sixth Embodiment] The cylinder device 90 of the sixth embodiment is another example that enables two positions to be detected by one self - power generation device 1. In FIG. 15, the same components as those of the cylinder device 40 in FIG. 6 are denoted by the same reference numerals and the description thereof is omitted.

[0077] In FIG. 15A, the shaft body 5a is externally fitted with a sleeve 91. The cylinder hole 4 surrounds the sleeve 91. The sleeve 91 is restricted in its vertical movement by a stop ring 92, but it can rotate about the shaft body 5a. A turning mechanism 93 is provided between the shaft body 5a and the sleeve 91. The turning mechanism 93 includes a guide groove 94 and a ball (engaging tool) 95. The guide groove 94 is configured by connecting a spiral turning groove 94a and a straight - advance groove 94b upward. The ball 95 is inserted into the guide groove 94. The ball 95 is rotatably supported by a support opening 98 provided on the inner wall of the sleeve 91. When the piston portion 5b moves between the uppermost position and the lowermost position, the sleeve 91 turns 90 degrees by the turning mechanism 93.

[0078] In FIG. 15B, on the outer periphery of the sleeve 91, circular displacement portions 96 and 97, which the detecting portion 11 overlaps, are provided on the same circumference at different angular positions (separated by an angle of 90 degrees) with respect to the center line C. The displacement portions 96 and 97 are holes having a diameter smaller than that of the detecting portion 11 perforated at the same height position as the opening 9. When the detecting portion 11 in the opening 9 overlaps the displacement portions 96 and 97, the vertical movement of the shaft main body 5a is converted into movement in a direction perpendicular to the center line C (c1 direction, the radial direction of the center line C).

[0079] FIG. 15A shows the cylinder device 90 in the released state. The piston portion 5b is at the lowest descending position, and the detecting portion 11 overlaps the displacement portion 96. When the detecting portion 11 overlaps the displacement portion 96, the self - power generation device 1 operates the wireless module 101 to notify the outside that it has reached the release position by a wireless signal.

[0080] FIG. 16A shows the cylinder device 90 in the locked state. The piston portion 5b is at the highest ascending position, and the detecting portion 11 overlaps the displacement portion 97. When the detecting portion 11 overlaps the displacement portion 97, the self - power generation device 1 operates the wireless module 101 to notify the outside that it has reached the lock position by a wireless signal.

[0081] In the cylinder device 90 of the sixth embodiment, in the self - power generation device 1, although a change in magnetic flux occurs in the core 17, the direction of the magnetic flux is the same direction and cannot be distinguished only by the wireless signal of the wireless module 101. Therefore, it is necessary to determine whether it is in the release position or the lock position according to whether the cylinder device 90 is in the operation process of moving to the release position or the operation process of moving to the lock position. In this case, by combining the pressure increase signal in the lower chamber 3b and the signal transmitted when the detecting portion 11 is inserted into the hole on the lock - position side, or by combining the pressure increase signal in the upper chamber 3a and the signal when the detecting portion 11 is inserted into the hole on the release - side position, the controller can determine that the piston has reached a predetermined position by combining the information.

[0082] In the sixth embodiment, the displacement portions 96 and 97 are provided on the outer periphery of the sleeve 91, but only one of the displacement portion 96 or the displacement portion 97 may be provided. Instead of this, as shown in Fig. 16B, a groove 99 may be provided on the outer periphery of the sleeve 91 so that the detection portion 11 rides on the outer periphery of the sleeve 91 at the displacement portions before the release position tp1 and the lock position tp2 shown in light ink. According to the cylinder device 90 of the sixth embodiment, one or two positions can be detected by one self - contained power generation device 1. If more displacement portions are added, positions at other locations can also be detected.

[0083] [Seventh Embodiment] The seventh embodiment is another example in which the sixth embodiment, which enables two positions to be detected by one self - contained power generation device 1, is modified. In Fig. 17A, the same components as those of the cylinder device 90 in Fig. 16 are denoted by the same reference numerals and the description thereof is omitted. In the seventh embodiment, the sleeve 91 is replaced by a sleeve 111, and similar to the sleeve 91, it rotates 90 degrees by the rotation mechanism 93.

[0084] In Figs. 17B and 17C, on the sleeve 111, displacement portions 116 and 117 are provided on the same circumference at different angular positions of the center line C. The displacement portions 116 and 117 have different radial distances from the center line C. In this example, the displacement portion 116 is closer to the center line C and the displacement portion 117 is farther away. On the same circumference between the displacement portions 116 and 117, a groove 119 having a radial distance from the center line C intermediate between the displacement portions 116 and 117 is provided. The depth of the groove 119 of the groove is set to a depth such that the contact terminal 22 of the self - contained generator 1 is not affected by any of the pole pieces 15a, 15b, 16a, and 16b and does not move.

[0085] FIG. 17D shows the electromotive force of the self - power generator 1 when the probe 11 moves from the displacement part 116 to the displacement part 117. When moving from the displacement part 116 to the groove 119, the contact terminal 22 only varies the distance from the displacement part 116 to the groove 119 according to the rotational speed of the sleeve 111. Therefore, the electromotive force during this movement cannot generate enough power to transmit a signal. When the probe 11 is moved to the displacement part 117 at the end stage of the rotational movement process of the sleeve 111, a large electromotive force is generated because the probe 11 is instantaneously moved by the magnetic force of the pole pieces 15a and 16b.

[0086] When the sleeve 111 rotates and moves in the reverse direction, the reverse phenomenon occurs. That is, when moving out of the displacement part 117 and moving along the groove 119, it cannot generate enough power to transmit a signal. However, when the probe 11 is moved to the displacement part 116 at the end stage of the rotational movement process of the sleeve 111, a large electromotive force is generated.

[0087] In each of the above - described embodiments, the vertical movement of the shaft body 5a is converted into a movement that moves the core body 17b in the core - axis direction c1. Contact terminals are provided in front of and behind the core body 17b respectively. Between both ends of the U - shaped magnetic - flux path that overlaps with a gap, when each contact terminal contacts from one side to the other side by linear movement, the direction of the magnetic flux passing through the coil center of the coil unit can be reversed without magnetic - flux leakage. Although the self - power generator 1 is used, the self - power generator 1' may be used instead.

Explanation of Reference Numerals

[0088] 1, 1' Self - power generator 2 Housing 2a Ceiling part 2b Bottom part 2c Barrel wall 3 Cylinder hole 3a Chamber 3b Chamber 4 Cylindrical hole 4a Groove 5 Shaft member 5a Shaft body 5b Piston part 5c Lower shaft 5d Step part 5e Taper shaft part 6 Guide groove 7 Ball 8, 43, 53, 68, 73, 83, 96, 97, 116, 117 Displacement part 9 Opening 11 Probe part 12 Coil unit 13 Magnet unit 14 Permanent magnet 15, 16 Magnetic flux path 15a, 15b, 16a, 16b Pole piece 17 Core 17a Front end part 17b Core body 17c Rear end part 17d, 17e Sliding surface 18 Elastic body 19 Coil 19a Bobbin 21, 22, 21’, 22’ Contact terminal 21a, 21b, 22a, 22b Contact surface 23 Bolt 24 Spring chamber 25 Actuating chamber 26 Flow path 27 Piston 30 Link clamp mechanism 30a, 30b Link 30c Point of action 31 Sleeve 32 Elastic body 34 Fixed end 40 Cylinder device 50 Cylinder device 51 Sleeve 51a Lower end 51b Upper end 54 Fixed end 55 Elastic body 60 Cylinder device 61 Safety valve 62 Spring seat 64a, 64b Adjusting screw 70 Cylinder device 71 Gripping member 71a Gripping claw 72 Sleeve 80 Cylinder device 81 Sleeve 81a Lower end 81b Upper end 84 Braking member 84a Stop ring 90 Cylinder device 91 Sleeve 92 Stop ring 93 Swiveling mechanism 94 Guide groove 94a Swiveling groove 94b Straight movement groove 95 Ball (engaging tool) 98 Support opening 99 Groove 101 Wireless module 111 Sleeve 119 Groove 200 Test circuit C Center line P Path W Workpiece Wh Hole a Protrusion b Recess c1 Core axis direction d Distance g Gap p Input end r Pedestal part ss Seating surface t Interval tp1 Release position tp2 Lock position v1 Moving speed x Notch φ1 Magnetic circuit φ2 Magnetic circuit

Claims

1. A piston part that moves in the vertical direction, a shaft body following the piston part, a cylindrical hole surrounding the shaft body provided with an opening in the middle of its height, and a self - generating power device, wherein a displacement part is provided on the shaft body so as to face the opening at a predetermined position while the piston part moves up and down, On the other hand, the self - generating power device, A coil unit in which a coil is wound around the outer periphery of a core having the core axis direction as the length direction, and having contact terminals on the front and rear of the outer periphery of the core with the coil interposed therebetween, and A magnetic flux path in a U - shape in a side view of a soft magnetic body provided respectively for the upper and lower magnetic poles of a permanent magnet. With the permanent magnet interposed therebetween, one magnetic flux path is on the inside and the other magnetic flux path is on the outside, and they overlap with a space therebetween. The pole pieces at both ends thereof are paired with each other facing each other, and a magnet unit arranged on the front side and the rear side of the coil, and The pair of pole pieces on the front side sandwich the contact terminal on the front side in the core axis direction, and the pair of pole pieces on the rear side are arranged so as to sandwich the contact terminal on the rear side in the core axis direction, When the core is in the first position on the front side, the front contact terminal is in contact with the front pole piece among the pair of front pole pieces, and the rear contact terminal is in contact with the front pole piece among the pair of rear pole pieces, When the core is in the second position on the rear side, the front contact terminal is in contact with the rear pole piece among the pair of front pole pieces, and the rear contact terminal is in contact with the rear pole piece among the pair of rear pole pieces, A cylinder device characterized in that the contact portion of the core protruding from the opening overlaps the displacement part, thereby converting the vertical movement of the piston part into a movement in the core axis direction.

2. A piston part that moves in the vertical direction, a shaft body following the piston part, a sleeve surrounding the shaft body and biased in the upward direction, a cylindrical hole surrounding the sleeve provided with an opening in the middle of its height, and a self - generating power device, wherein a displacement part is provided on the sleeve so as to face the opening at a predetermined position while the piston part moves up and down, and the sleeve engages with the stepped portion of the shaft body and moves only within a predetermined first range during the process of the shaft body descending, On the other hand, the self - generating power device, A coil unit in which a coil is wound around the outer periphery of a core having the core axis direction as the length direction, and having contact terminals on the front and rear of the outer periphery of the core with the coil interposed therebetween, In a side view of soft magnetic bodies respectively provided for the upper and lower magnetic poles of a permanent magnet, U-shaped magnetic flux paths overlap with each other at intervals, with one magnetic flux path on the inner side and the other on the outer side, sandwiching the permanent magnet. The pole pieces at both ends thereof face each other in a pair and are disposed on the front side and the rear side of the coil, and the pair of pole pieces on the front side sandwich the front contact terminal in the core axis direction, and the pair of pole pieces on the rear side are disposed so as to sandwich the rear contact terminal in the core axis direction. When the core is in the first position on the front side, the front contact terminal is in contact with the front pole piece among the pair of front pole pieces, and the rear contact terminal is in contact with the front pole piece among the pair of rear pole pieces. When the core is in the second position on the rear side, the front contact terminal is in contact with the rear pole piece among the pair of front pole pieces, and the rear contact terminal is in contact with the rear pole piece among the pair of rear pole pieces. A cylinder device characterized in that the probing portion of the core protruding from the opening overlaps the displacement portion, thereby converting the vertical movement of the piston portion into a movement in the core axis direction.

3. A piston portion that moves in the vertical direction, a shaft body following the piston portion, a sleeve surrounding the shaft body, a cylindrical hole surrounding the sleeve provided with an opening in the middle of its height, and a self-powered generator. The sleeve is provided with a displacement portion so as to face the opening at a predetermined position while the piston portion moves up and down, and the sleeve engages with the first stepped portion of the shaft body and moves only in the first range at the end of the process of the shaft body descending, and engages with the first and second stepped portions of the shaft body and moves only in the second range at the end of the process of the shaft body ascending. On the other hand, the self-powered generator A coil unit in which a coil is wound around the outer periphery of a core having the core axis direction as the length direction, and having contact terminals respectively on the front and rear of the outer periphery of the core with the coil interposed therebetween. In a side view of soft magnetic bodies respectively provided for the upper and lower magnetic poles of a permanent magnet, U-shaped magnetic flux paths overlap with each other at intervals, with one magnetic flux path on the inner side and the other on the outer side, sandwiching the permanent magnet. The pole pieces at both ends thereof face each other in a pair and are disposed on the front side and the rear side of the coil, and The pair of pole pieces on the front side sandwich the front contact terminal in the core axis direction, and the pair of pole pieces on the rear side are arranged to sandwich the rear contact terminal in the core axis direction. When the core is in the first position on the front side, the front contact terminal is in contact with the front pole piece among the pair of front pole pieces, and the rear contact terminal is in contact with the front pole piece among the pair of rear pole pieces. When the core is in the second position on the rear side, the front contact terminal is in contact with the rear pole piece among the pair of front pole pieces, and the rear contact terminal is in contact with the rear pole piece among the pair of rear pole pieces. A cylinder device characterized in that the probing portion of the core protruding from the opening overlaps the displacement portion, and the vertical movement of the piston portion is converted into a movement in the core axis direction.

4. It includes a piston portion that moves in the vertical direction, a shaft body following the piston portion, a sleeve that surrounds the shaft body, a cylindrical hole that surrounds the sleeve provided with an opening in the middle of its height, and a self-powered generator. One or more displacement portions are provided on the same circumference of the sleeve so as to face the opening, and the sleeve rotates during the vertical movement of the shaft body. On the other hand, the self-powered generator A coil is wound around the outer circumference of a core having the core axis direction as its length direction, and a coil unit having contact terminals on the front and rear of the outer circumference of the core sandwiching the coil. A U-shaped magnetic flux path in a side view of a soft magnetic material provided for the upper and lower magnetic poles of a permanent magnet overlaps with a space between them with one magnetic flux path on the inner side and the other magnetic flux path on the outer side with the permanent magnet sandwiched therebetween, and pole pieces at both ends thereof face each other in a pair and are arranged on the front and rear sides of the coil, and The pair of pole pieces on the front side sandwich the front contact terminal in the core axis direction, and the pair of pole pieces on the rear side are arranged to sandwich the rear contact terminal in the core axis direction. When the core is in the first position on the front side, the front contact terminal is in contact with the front pole piece among the pair of front pole pieces, and the rear contact terminal is in contact with the front pole piece among the pair of rear pole pieces. When the core is in the second position on the rear side, the front contact terminal is in contact with the rear pole piece among the pair of front pole pieces, and the rear contact terminal is in contact with the rear pole piece among the pair of rear pole pieces. A cylinder device characterized in that the probing portion of the core protruding from the opening overlaps the displacement portion, and the vertical movement of the piston portion is converted into a movement in the core axis direction. **Claim 5** In the cylinder device according to claims 1 to 4, the coil unit is provided with sliding surfaces having a predetermined distance in the core axis direction before and after the outer periphery of the core with the coil interposed therebetween, and the front and rear contact terminals can slide on the front and rear sliding surfaces respectively. A cylinder device characterized in that in the process of the core moving from the first position to the second position, the two contact terminals move on the sliding surface by the magnetic force from the pole piece. **Claim 6** A piston portion that moves in the vertical direction, a shaft body following the piston portion, a sleeve surrounding the shaft body, a cylindrical hole surrounding the sleeve provided with an opening in the middle of the height, and a self - power generation device. The sleeve is provided with two displacement portions having different distances from the center on the same circumference facing the opening, and a groove having a depth in the middle of the two displacement portions on the same circumference. And the sleeve rotates in the process of the shaft body moving up and down. On the other hand, the self - power generation device A coil is wound around the outer periphery of a core having the core axis direction as the length direction, and a coil unit having contact terminals before and after the outer periphery of the core with the coil interposed therebetween. U - shaped magnetic flux paths in side view of soft magnetic bodies provided respectively for the upper and lower magnetic poles of a permanent magnet overlap with a space between them with the permanent magnet interposed therebetween, one magnetic flux path on the inner side and the other magnetic flux path on the outer side, and pole pieces at both ends of them face each other in pairs and are arranged on the front side and the rear side of the coil, and The pair of front pole pieces sandwich the front contact terminal in the core axis direction, and the pair of rear pole pieces sandwich the rear contact terminal in the core axis direction. The coil unit is provided with sliding surfaces having a predetermined distance in the core axis direction before and after the outer periphery of the core with the coil interposed therebetween, and the front and rear contact terminals can slide on the front and rear sliding surfaces respectively. When the core is in the first position on the front side, the front contact terminal is in contact with the front pole piece among the pair of front pole pieces, and the rear contact terminal is in contact with the front pole piece among the pair of rear pole pieces. When the core is in the second position on the rear side, the front contact terminal is in contact with the rear pole piece among the pair of front pole pieces, and the rear contact terminal is in contact with the rear pole piece among the pair of rear pole pieces. A cylinder device characterized in that the vertical movement of the piston part is converted into the movement in the core axis direction by the probing part of the core protruding from the opening overlapping the displacement part, and in the process of the core moving from the first position to the second position, the two contact terminals move on the sliding surface by the magnetic force from the pole piece.

Images