JP2005199466A - Tire molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the main shaft structure of a tire molding machine having a simple structure capable of increasing and contracting the diameter of a molding drum at an arbitrary speed while always detecting the on-off state of the molding drum and capable of rotating the molding drum while holding a medium expanded diameter at the time of delivery or centering of a band. <P>SOLUTION: The tire molding machine 1 has a rotary shaft having a double shaft structure composed of an inner shaft 10 and a sleeve shaft 20 and is constituted so as to open and close the molding drum 40 by relatively twisting the inner shaft 10 and the sleeve shaft 20. This tire molding machine is equipped with a drive device 30 for rotationally driving the sleeve shaft 20, a clutch 40 for connecting the sleeve shaft 20 and the inner shaft 10, a brake 50 for braking and fixing the inner shaft 10 and a twist angle detecting means 60 for detecting the twist angles of the inner shaft 10 and the sleeve shaft 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tire molding machine that performs rotational driving of a molding drum for attaching a belt-shaped member constituting a tire and expansion / contraction driving of the diameter thereof.

  In a tire molding machine, with the diameter of the molding drum expanded, the inner liner, carcass, sidewalls, etc. are attached in order, the diameter of the molding drum is reduced after the application is completed, and the cylindrical laminate is removed. Yes.

  Therefore, a tire molding machine has a mechanism that forms a molding drum with a plurality of drum segments and slides these drum segments in the radial direction to increase or decrease the diameter, and rotates the relative position of the middle shaft and sleeve shaft. When the twist angle is applied, the drum segment slides to increase or decrease the diameter of the forming drum. In order to efficiently perform the rotational driving of the molding drum and the expansion / contraction driving of the diameter with a small drive source, various ideas have been made regarding the main shaft structure of the tire molding machine.

  In these tire molding machines, in order to reduce the drive source, the arrangement of the clutch and brake is devised, and the central shaft (main shaft, screw shaft) and the sleeve shaft (sleeve, drum shaft) are synchronized by a single motor. By performing the rotation and the relative rotation between the middle shaft and the sleeve shaft, the rotation and expansion / contraction of the forming drum are properly used (see, for example, Patent Document 1 and Patent Document 2).

  Further, there is a conventional tire molding machine as shown in FIG. 10, in which a middle shaft 10 driven and rotated by a motor 30 is supported by a support base, and a sleeve shaft 20 is provided on the outer side, and the sleeve shaft 20 is provided. Is coupled to the middle shaft 10 by a gear clutch 81. In addition, an air clutch 40 is provided at the end of the middle shaft 10 so that it can be connected to an open / close arm 83 that is swung by an open / close cylinder 82, the gear clutch 81 is turned on, and the air clutch 40 is fixed with the sleeve shaft fixed. By turning on and operating the open / close cylinder 82, the middle shaft 10 is twisted, and a twist angle is provided between the middle shaft 10 and the sleeve shaft 20. In the main shaft structure of the tire molding machine as shown in FIG. 10, since the opening / closing cylinder 82 is normally in two positions, it is not possible to achieve an intermediate opening degree only by full opening and full closing.

  However, in a tire manufacturing method called a large-diameter molding method, after forming a band by winding a member with a band molding machine, the band is handed over to the tire molding machine. Since it is smaller than the full opening diameter of the forming drum, it is received by a forming drum having a medium opening diameter, and after receiving this band, the forming drum is expanded, and the tire is formed while rotating in the fully open state.

When delivering this band, it is important to adjust the center opening diameter to match the inner diameter of the band with high accuracy and to perform centering with high accuracy. There is a problem that the quality deteriorates due to slack. Therefore, it is necessary to center the band by rotating the molding drum while maintaining the state of the medium opening diameter with high accuracy. In addition, the forming drum can be changed according to the rim diameter of the tire, and the twist angle corresponding to the full opening diameter, the middle opening diameter, and the full closing diameter differs depending on the drum. It has also been emphasized that it can be easily changed.
Japanese Utility Model Publication No. 61-173328 Japanese Patent Application Laid-Open No. 08-25513

  The object of the present invention is to make the opening and closing degree of the molding drum of the tire molding machine not only fully open and fully closed, but also in the middle open state. An object of the present invention is to provide a tire molding machine having a simple structure capable of rotating a molding drum while maintaining an open diameter with high accuracy.

  In order to achieve the above object, a tire molding machine has a rotary shaft having a double shaft structure including a middle shaft and a sleeve shaft arranged outside the middle shaft, and the middle shaft and the sleeve shaft are relatively A tire molding machine that opens and closes a molding drum by twisting, a drive device that rotationally drives the sleeve shaft, a clutch that connects the sleeve shaft and the middle shaft, and a brake that brakes and fixes the middle shaft, A twist angle detecting means for detecting a twist angle between the middle shaft and the sleeve shaft is provided.

  According to this configuration, by turning on the clutch that connects the sleeve shaft and the middle shaft and rotationally driving the sleeve shaft by the driving device, the middle shaft and the sleeve shaft can be rotated, and the molding drum can be rotated. Further, by turning off the clutch connecting the sleeve shaft and the middle shaft and fixing the middle shaft with a brake, the sleeve shaft is rotated by a driving device, whereby the sleeve shaft is rotated relative to the middle shaft and the twist angle is increased. Can be attached.

  Therefore, the driving device for rotating the main shaft also serves as a driving device for expanding and reducing the diameter of the forming drum, and the clutch is only between the sleeve shaft and the middle shaft, so that the structure is simple and space-saving, and the manufacturing cost is also reduced. descend.

  Furthermore, since the state of the diameter of the forming drum can always be detected by the twist angle detection device, even if the twist angle deviates from the setting due to some cause between the center shaft and the sleeve shaft during drum rotation, it is accurate. And can prevent the occurrence and outflow of abnormal products. Further, even when the brake or the like slips when the drum is opened / closed, the slip amount is not reflected in the twist angle, so that no error occurs in the drum diameter.

  In addition, it is possible to rotate the molding drum while maintaining the intermediate opening diameter even when the drum is open for band transfer and centering. Can be adjusted. Furthermore, since the twist angle can be detected at any time, by obtaining the relationship between the diameter of the forming drum and the twist angle in advance, changing the diameter of the fully open, middle open, and fully closed can change the corresponding twist angle. Can be easily performed.

  Therefore, the opening / closing degree of the molding drum of the tire molding machine can be not only fully opened and fully closed, but also in the middle open state. The molding drum can be rotated while holding it well.

  In addition, when the twist angle is set, if the drive device is configured by a motor and the sleeve shaft is rotated via a speed reducer, the motor is driven when the forming drum is expanded or contracted, so that the impact is reduced. In addition, by adjusting the rotation speed of the motor and appropriately setting the reduction ratio of the speed reducer, the diameter can be increased and decreased at an arbitrary speed, and higher torque than that of an air cylinder or the like can be easily generated.

  In the tire molding machine, the twist angle detection unit rotates in accordance with the rotation of the first shaft having a spline that rotates in accordance with the rotation of one of the central shaft and the sleeve shaft, and the rotation of the other shaft. A second shaft having a multi-threaded screw, a spline female thread portion engaged with the spline, a movable sleeve shaft having a multi-thread female thread portion screwed into the multi-threaded screw, and a linear movement amount of the movable sleeve. A movement amount detecting means for detecting, and a twist angle between the middle shaft and the sleeve shaft is converted into a linear movement amount of the moving sleeve shaft and detected by the movement amount detecting means. Is done.

  The linear movement amount of the moving sleeve can be detected, for example, when the protrusion provided on the moving sleeve approaches the proximity switch arranged in the moving direction of the moving sleeve and the proximity switch is turned on. When this proximity switch is used, the diameters of fully open, intermediate open, and fully closed can be easily changed by changing the position of the proximity switch corresponding to each. Further, the linear movement amount of the moving sleeve may be detected by a length sensor, a displacement sensor, a position sensor, or the like. In this case, the twist angle can be detected continuously.

  According to this configuration, the twist angle between the rotating middle shaft and the sleeve shaft can be converted into a linear movement amount of the moving sleeve, and this linear movement amount is detected by the movement amount detecting means. The twist angle can always be detected with high accuracy.

  According to the tire molding machine of the present invention, since the driving device for rotating the main shaft also serves as the driving device for expanding and reducing the diameter of the forming drum, the structure is simple and the space is saved, and the manufacturing cost is also reduced.

  In addition, even when the drum for the delivery and centering of the band is in the middle open state, the forming drum can be rotated with the intermediate open diameter maintained, and even when the drum is rotating, the opening angle is detected by the twist angle detection device. Therefore, the medium opening diameter can be finely adjusted with high accuracy. In addition, the diameter of the molding drum can be increased and decreased at an arbitrary speed.

  Furthermore, since the state of the diameter of the forming drum can always be detected by the twist angle detection device, even if a slip occurs due to some reason between the center shaft and the sleeve shaft, the twist angle deviates from the setting drum diameter. It can be detected accurately and the occurrence and outflow of abnormal products can be prevented.

  And, in the tire molding machine described above, the twist angle between the middle shaft and the sleeve shaft is converted into the linear movement amount of the moving sleeve shaft of the twist angle detecting device, and is configured to be detected by the movement amount detecting means. A relatively simple sensor can accurately detect the twist angle of the rotating middle shaft and sleeve shaft.

  Therefore, the tire molding machine of the present invention has a simple structure, and can open and close the molding drum not only fully open and fully closed, but also in the middle open state. The molding drum can be rotated while keeping this medium opening diameter with high accuracy.

  Hereinafter, a tire molding machine according to an embodiment of the present invention will be described with reference to the drawings, taking a collapse type molding drum as an example.

  As shown in FIGS. 1 and 2, a tire molding machine according to an embodiment of the present invention is a tire molding machine 1 that opens and closes a collapse-type molding drum 70. The tire molding machine 1 is disposed outside the middle shaft 10. And a motor 30 as a driving device for rotationally driving the sleeve shaft 20, and an air clutch 40 connecting the sleeve shaft 20 and the middle shaft 10. And a disc brake 50 that is a brake for braking and fixing the middle shaft 10, and a twist angle detecting device 60 for the middle shaft 10 and the sleeve shaft 20.

  The middle shaft 10 is disposed inside the sleeve shaft 20, and one end side (A direction end portion) is connected to the first rotating shaft 71 of the forming drum 70 shown in FIG. 3, and the other end side (B direction end portion). As shown in FIGS. 1 and 2, the boss 11 is fitted. An air clutch 40 is provided on the A direction side of the boss 11 and is configured to be connected to the sleeve shaft 20.

  Further, a disc 51 for the disc brake 50 is provided on the B direction side of the boss 11. By pressing a pad (brake lining plate) 52 against the disc 51, the middle shaft 10 is rotated while the middle shaft 10 is rotating. The rotation of the center shaft 10 can be braked and stopped, and when the rotation of the middle shaft 10 is stopped, the middle shaft 10 can be fixed so as not to rotate.

  The sleeve shaft 20 is supported by a support base 23 with a first support portion 21 and a second support portion 22, and one end side (end portion in the A direction) of the sleeve shaft 20 is a second rotation of the forming drum 70 as shown in FIG. 3. The pulley 24 connected to the shaft 72 receives the rotation from the motor 30 via the speed reducer 31, the speed reducer side pulley 32, and the belt 33, as shown in FIGS. 1 and 2. Is provided. Further, a friction (friction) drum or drum 44 for the air clutch 40 is provided on a side surface of the pulley 24.

  The air clutch 40 is driven by air supplied from an air hose 41 via a rotary joint 42 provided at the end of the middle shaft 10 on the B direction side. When air is supplied, the air clutch 40 is fixed to the middle shaft 10 side. The tube 43 is expanded and pressed by the drum 44 on the side surface of the pulley 24 of the sleeve shaft 20 to turn on the clutch. When the supply of air is stopped, the tube 43 is reduced and separated from the drum 44 to turn off the clutch. The air clutch 40 rotates with the middle shaft 10 and can supply air to the tube 43 via the rotary joint 42 even during rotation.

  As shown in FIGS. 3 to 5, the collapse-type forming drum 70 includes a first rotating shaft 71 that engages with the middle shaft 10 and rotates together, and a second rotating shaft that engages with the sleeve shaft 20 and rotates together. 72 and several pairs (four in FIG. 4 and FIG. 5) of drum segments 73 and 74 forming the outer periphery of the drum. The drum segments 73 and 74 are a set of a large-side segment 73 and a small-side segment 74. For example, in the case of a six-split drum, the drum segments 73 and 74 include six sets of drum segments 73 and 74.

  The large drum segment 73 includes a drum flange 73a and a shell 73b, and a first support portion 73c of the shell 73b is fixed to the first rotating shaft 71 by a first hinge 75 (first support portion). 1 link) 71a, and is connected to a second support portion (second link) 77 by a second hinge 76. The second support portion 77 is connected to the second rotating shaft 72 by a third hinge 78. The small piece side segment 74 includes a drum flange 74a and a shell 74b, and the shell 74b is connected to a third support portion (third link) 77 'by a fourth hinge 76'. The third support portion 77 ′ is connected to the second rotating shaft 72 by a fifth hinge 78 ′. In the case of the collapse type, the enlargement / reduction range can be made larger than that of the expansion type.

  Therefore, since the drum segments 73 and 74 are supported by the link mechanism of the first support portion 73c and the second support portion 77 and the third support portion 77 ′, the drum shafts 73 and 74 are moved from the maximum diameter state to the middle shaft 10 and the sleeve shaft 20. When a twist is given and a twist angle (for example, 50 ° to 60 °) is applied, a twist angle is also formed between the first rotating shaft 71 and the second rotating shaft 75, and the third hinge with respect to the first hinge portion 72. Since the part 76 moves relatively in the rotation direction and the link mechanism is opened, the drum segments 73 and 74 supported on the front end side of the link mechanism are reduced in diameter. The state of the segments 73 and 74 at the time of diameter expansion and diameter reduction is shown in FIGS.

  As shown in FIGS. 6 to 9, the twist angle detecting device 60 is synchronized with the first shaft 62 (spline shaft) 62 that rotates in synchronization with the rotation of the middle shaft 10 and one rotation of the sleeve shaft 20. A rotating second shaft (multi-threaded screw shaft) 65, a first shaft 62, and a moving sleeve 69 outside the second shaft 65 are formed. The first shaft 62 has a spline 62 a formed in the A direction and a first sprocket 62 b provided at the end in the B direction. The first shaft 62 is rotatably supported on the support base 61 by a support portion (pillow unit) 63. Yes. The second shaft 65 is provided with a second sprocket 65b at the end in the A direction, and a multi-thread screw 65a is formed in the B direction, and is rotatably supported by the support base 61 by the support portion 66. The first shaft 62 and the second shaft 65 are arranged on the same axis.

  The rotation of the middle shaft 10 is transmitted to the first shaft 62 by the middle shaft rotation transmission mechanism, and the rotation of the sleeve shaft 20 is transmitted to the second shaft 65 by the sleeve rotation transmission mechanism. This center shaft rotation transmission mechanism includes a center shaft sprocket 12 provided on the boss 11 fixed to the center shaft 10, a first shaft sprocket 62b fixed to the first shaft 62, and a first chain 64 connecting the two. The sleeve shaft rotation transmission mechanism is configured by a sleeve shaft sprocket 25 fixed to the sleeve shaft 20, a second shaft sprocket 65b fixed to the second shaft 65, and a second chain 67 connecting the two. Is done.

  Further, a moving sleeve 69 is provided, and a spline female screw portion 69a that engages with a spline 62a of the first shaft 62 at the end in the B direction and is freely movable in the AB direction is fixed. A multi-thread female screw portion 69b that is screwed into the multi-thread screw 65a of the second shaft 65 and moves with relative rotation with the multi-thread screw 65a in the A-B direction is fixed to the end portion in the A direction. It has been. Further, a projecting portion 69c for detecting the movement amount by the proximity switches 68a to 68c is provided.

  With this configuration, the first shaft 62 rotates at a rotational speed proportional to the rotational speed of the middle shaft 10, the second shaft 65 rotates at a rotational speed proportional to the rotational speed of the sleeve shaft 20, and the middle shaft 10 and the sleeve shaft 20. The first shaft 62 and the second shaft 65 rotate with a phase difference proportional to the twist angle between the first shaft 62 and the second shaft 65. Therefore, in the moving sleeve 69, the spline female screw portion 69a at the B direction end rotates with the rotation of the first shaft 62, and the multi-thread female screw portion 69b at the A direction end rotates with the rotation of the second shaft 65.

  When the twist angle between the middle shaft 10 and the sleeve shaft 20 is zero when the forming drum 70 has a minimum diameter (fully closed), for example, as shown in FIGS. 6 and 7, the moving sleeve 69 protrudes in the A direction side. Assuming that the portion 69c faces the proximity switch 68a, when the twist angle is increased from zero, a phase difference is generated in the rotation between the middle shaft 10 and the sleeve shaft 20 by the twist angle. The phase difference is reflected in the phase difference between the first shaft 62 and the second shaft 65 via the center shaft rotation transmission mechanism and the sleeve shaft rotation transmission mechanism, and the first shaft 62 and the second shaft are proportional to the phase difference. A phase difference occurs between 65.

  Since the multi-thread female screw portion 69b relatively rotates around the multi-thread screw 65a by an amount corresponding to the phase difference between the first shaft 62 and the second shaft 65, the multi-thread female screw portion 69b is a multi-thread screw. It moves in the B direction along 65a. Therefore, the moving sleeve 69 that fixes the multi-thread female screw portion 69b moves in the B direction, and the protruding portion 69c moves in the B direction by an amount proportional to the twist angle between the middle shaft 10 and the sleeve shaft 20. Become. The proximity switch 68a, 68b, 68c detects the movement of the protrusion 69c in the AB direction.

  According to this configuration, not only when the forming drum 70 is fully closed (minimum diameter) and fully open (maximum diameter), but also the intermediate diameter can be easily detected by the detection unit (proximity switch) 68b. The proximity switches 68a, 68b, and 68c are provided on the rail so as to be movable in the A-B direction, and are adjusted in accordance with the opening degree of the forming drum 40 (full open, middle open, fully closed) required in the machining process. Set and fixed.

  In the twist angle detection device 60, the ratio of the diameter of the first sprocket 62b and the diameter of the sprocket 12 for the medium shaft is the ratio of the twist angle and the phase difference between the first shaft 62 and the second shaft 65. The twist angle can be increased by the ratio of the diameter of 62b to the diameter of the sprocket 12 for the medium shaft, and the large thread 65a having a large lead and the multiple thread female thread 69b, which is the distance that moves in the axial direction when the screw is rotated once, By the combination, the distance moved by the phase difference between the first shaft 62 and the second shaft 65 depending on the twist angle can be made larger than one screw.

  The ratio of the diameter of the second sprocket 65b and the diameter of the sleeve shaft sprocket 25 is the same as the ratio of the diameter of the first sprocket 62b and the diameter of the middle shaft sprocket 12. Although not shown, a rotation detector that detects the rotation speed of the sleeve shaft 20 is provided, and the rotation speed of the rotation shaft that receives the transmission of the rotation of the second shaft 65 is detected by an encoder.

  According to the main shaft structure 1 of the tire molding machine having this configuration, by supplying air to the air clutch 40 and turning on the clutch, the middle shaft 10 and the sleeve shaft 20 can be integrally rotated and stopped. By stopping the supply of air and turning off the clutch, the middle shaft 10 and the sleeve shaft 20 can be disconnected, and the twist angle can be changed by rotating only the sleeve shaft 20 regardless of the rotation of the middle shaft 10.

  Further, by turning on the brake 50, the middle shaft 10 can be braked, stopped, and fixed. Further, if the clutch 40 is turned on, the sleeve shaft 20 can be braked, stopped, or fixed together with the middle shaft 10.

  Therefore, in the main shaft structure 1 of the tire molding machine, when the motor 30 is driven and rotated with the reduction gear 31 set to an appropriate reduction ratio with the brake 50 turned on and the clutch 40 turned off, the middle shaft 10 is fixed. Since the sleeve shaft 20 is rotated as it is, the sleeve shaft 20 is rotated to the twist angle corresponding to the desired opening degree of the forming drum 70 while detecting the twist angle by the twist angle detection device 60, and the drive of the motor 30 is stopped. To do. Thereby, the desired opening degree of the forming drum 70 is obtained. Note that the relationship between the twist angle and the diameter of the forming drum is known in advance.

  When the air 43 is inflated by inflating the tube 43 via the air hose 41 and the rotary joint 42 to turn on the air clutch 40, the middle shaft 10 and the sleeve shaft 20 are integrated, and the reduction gear 31 is set to an appropriate reduction ratio. When the motor is driven and rotated, the middle shaft 10 and the sleeve shaft 20 rotate at the same rotational speed, and the forming drum 70 also rotates at a desired opening degree. In this rotation, when the brake 50 is turned on with the clutch 40 kept ON, the brake is applied to the middle shaft 10 and both the middle shaft 10 and the sleeve shaft 20 are stopped.

  Here, when the brake 50 is turned on and the clutch 40 is turned off while the middle shaft 10 is fixed and the motor 30 is driven to rotate, only the sleeve shaft 20 rotates, and the twist angle between the middle shaft 10 and the sleeve shaft 20 is increased or decreased. Can be made. Since the diameter of the forming drum 70 is increased or decreased by increasing or decreasing the twist angle, the next desired opening degree is set.

  The diameter of the molding drum 70 is normally changed when the molding drum 70 is stopped. However, in the present invention, if necessary, the degree of clutch ON of the air clutch 40 and the degree of ON of the brake 40 are adjusted. Thus, the rotation of the molding drum 70 can be performed without stopping the rotation without stopping.

  That is, when the degree of pressing of the tube 43 of the air clutch 40 is loosened and the brake 40 is strengthened, a deviation (phase difference, twist angle) occurs in the rotation of the middle shaft 10 and the sleeve shaft 20. After twisting to the twist angle, the pressure of the tube 43 of the air clutch 40 is returned and the brake 40 is turned off, so that the diameter and diameter can be expanded and stopped without stopping the rotation of the middle shaft 10 and the sleeve shaft 20.

It is a figure showing a tire molding machine of an embodiment of the invention. It is a figure which shows typically the main shaft structure of the tire molding machine of embodiment of this invention. It is a figure which shows the structure of a forming drum, (a) shows the sectional side view of a forming drum, (b) shows the cross section of a center axis | shaft, (c) is the 2nd rotating shaft seen from XX 'direction. A transverse section and a diameter increasing direction and a diameter decreasing direction when the sleeve shaft is rotated while the middle shaft is fixed are shown. It is a figure which shows the state at the time of diameter expansion of a forming drum. It is a figure which shows the state at the time of diameter reduction of a forming drum. The forming drum is fully opened in a plan view showing the twist angle detection device. FIG. 7 is a side view of FIG. 6. A plan view showing a twist angle detecting device shows a fully-closed state of the forming drum. It is a side view of FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows typically the main shaft structure of the tire molding machine of a prior art, (a) is a sectional side view, (b) is a figure which shows the relationship between the opening / closing cylinder and the twist of a center shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tire molding machine 10 Middle shaft 20 Sleeve shaft 30 Motor (drive device)
40 Air clutch (clutch)
50 Disc brake (brake)
60 Twist angle detection device (twist angle detection means)
62 1st shaft (spline shaft)
62a Spline 62b First sprocket 65 Second shaft (multiple threaded shaft)
65a Multi-thread 65b Second sprocket 68a, 68b, 68c Proximity switch 69 Moving sleeve 69a Spline female thread 69b Multi-thread female thread 69c Projection 70 Molding drum

Claims (2)

  A tire molding machine having a dual-axis rotating shaft comprising a middle shaft and a sleeve shaft disposed outside the middle shaft, and opening and closing a molding drum by relatively twisting the middle shaft and the sleeve shaft. A drive device for rotating the sleeve shaft; a clutch connecting the sleeve shaft and the middle shaft; a brake for braking and fixing the middle shaft; and a twist for detecting a twist angle between the middle shaft and the sleeve shaft. A tire molding machine comprising an angle detection means.   The twist angle detecting means includes a first shaft having a spline that rotates in accordance with the rotation of one of the central shaft and the sleeve shaft, and a second shaft having a multi-thread screw that rotates in accordance with the rotation of the other shaft. A moving sleeve shaft having a spline female threaded portion that engages with the spline, a multiple threaded female threaded portion that engages with the multiple threaded screw, and a moving amount detecting means that detects a linear moving amount of the moving sleeve. 2. The tire molding according to claim 1, wherein a twist angle between the middle shaft and the sleeve shaft is converted into a linear movement amount of the moving sleeve shaft and detected by the movement amount detecting means. Machine.

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