JP2013104245A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch equipped with a magnet brake which prevents unnecessary brake force in a switchover process.SOLUTION: A first permanent magnet 302 is provided on a top face of a switchover gear 132. Furthermore, in a stator/cover portion 306 assembled and fixed to a housing 10 (or integrally provided with the housing), a second permanent magnet 304 is fixed at a position where it faces the first permanent magnet 302 and is magnetically coupled therewith when the switchover gear 132 is in a normal position lock state or a reverse position lock state.

Description

  The present invention relates to a turning machine for converting a branching device of a railway line into a fixed position / inverted position.

  The electric switch generally includes a drive motor, a clutch, a reduction mechanism including a reduction gear group, and a conversion lock mechanism. The power generated by the drive motor is transmitted to the speed reduction mechanism via the clutch, and is converted into an appropriate torque to operate the conversion lock mechanism. In the final stage of the convertible lock mechanism, an operating rod and a rolling rod connected to the two movable rails of the branching device are connected, and the branching device is switched by controlling the drive of the drive motor. Can be made.

  For example, there is a type of electric switch that obtains a required clutch torque by rotating a magnet clutch directly with a motor and rotating it at a high speed. In this type of electric switch, the inertia of the rotor is increased due to the coupling of the magnet clutch to the motor, so that even if the motor power is turned off, the motor is difficult to stop due to the inertial force. Therefore, in this type of electric switch, this is dealt with by attaching a magnet brake to the rotor shaft of the motor (see, for example, FIG. 6 of Patent Document 1). The hysteresis magnetized material plate 95 constitutes a magnet brake.)

  However, such a magnetic brake always has a braking force. For this reason, even when the manual changeover is performed, the turning force tends to be heavy because the braking force is applied. Therefore, in recent years, a magnetic brake having such a characteristic that the braking force is small when not rotating and the braking force increases as the rotational speed increases is used.

Japanese Utility Model Publication No. 2-5401

  Now, in maintenance inspections of turning machines, in order to numerically manage the load fluctuations of turnouts, a method of measuring torque by turning by inserting a torque measuring instrument into the turning handle insertion port of a turning machine has become widespread. ing.

  However, in the type of electric switch that directly connects the magnetic clutch to the motor as described above, the braking force of the magnetic brake is added to the measured torque. Therefore, the braking force must be subtracted from the measured torque. Moreover, since the braking force also changes when the rotational speed of the hand is changed, it is necessary for the measurer to perform training for rotating at a constant speed in advance.

  Further, even under normal use conditions, the magnetic brake always uses the braking force, and therefore requires more power than the configuration without the magnetic brake. Therefore, when replacing the magnetic clutch with a type of electric switch that is directly connected to the motor, the problem is that the power supply and power cable must also be replaced in order to cope with the increase in power against the brake force that is always working. There was also.

  The present invention has been made in view of such circumstances, and an object of the present invention is to realize a turning machine equipped with a magnet brake that does not cause unnecessary braking force during the conversion process.

A first form for solving the above-described problem is a turning machine for driving an operating rod by engaging a conversion roller provided in the conversion gear and a cam portion of the operating rod, A first magnetic body (for example, the first permanent magnet 302 in FIGS. 2 and 3) provided at a predetermined position on the rotation surface of the gear and rotating together with the conversion gear;
Provided at a position that does not oppose the first magnetic body while the conversion roller is engaged with the conversion surface of the cam portion by generating a braking force by being magnetically coupled when facing the first magnetic body. And a second magnetic body (for example, the second permanent magnet 304 shown in FIGS. 2 and 3).

  In the second mode, the second magnetic body is fixed at a predetermined position in the housing so as to face the first magnetic body at the rotational position of the conversion gear when the operating rod is locked. This is a first type of turning machine.

  In the third mode, the second magnetic body is engaged with the escape surface after the engagement position of the conversion roller and the cam portion transitions from the conversion surface of the cam portion to the escape surface. Before or after the end, the first or second type of turning machine has a shape in which the facing of the first magnetic body is started.

  In the fourth embodiment, any one of the first to third components is configured such that a plurality of the first magnetic bodies are provided at symmetrical positions with respect to a line segment connecting the rotation shaft of the conversion gear and the conversion roller. This is a tipping machine.

  In the fifth aspect, the first magnetic body is provided at a position facing the second magnetic body at the time of stereotactic locking and at a position facing the second magnetic body at the time of reverse locking. This is a turning machine of any one of the first to fourth forms.

  In the sixth embodiment, the first magnetic body and / or the second magnetic body has a shape in which the facing area gradually increases after the facing of each other starts with the rotation of the conversion gear. This is a tipping machine according to any one of the first to fifth embodiments.

  The seventh embodiment includes first to first cover portions (for example, the stator / cover portion 306 in FIGS. 2 and 3) that cover the moving range of the first magnetic body and the installation position of the second magnetic body. A tipping machine of any of the sixth forms.

  According to the first aspect, the first magnetic body and the second magnetic body are magnetically coupled when they are opposed to generate a braking force, but while the conversion roller is engaged with the conversion surface of the cam portion. Are not opposite. In other words, the braking force does not work during the conversion that does not require the braking force. This does not affect the measurement of the load torque, so it becomes possible to measure the exact load torque during maintenance of the turning machine, and it is also necessary for the measurer to train in advance to rotate at a constant speed. Absent. Of course, it is not necessary to subtract the brake torque from the measured value. Further, since the brake is not working during the conversion, it is not necessary to drive the motor against the brake torque during the conversion, so that the power consumption can be suppressed and the energy can be saved.

  According to the 2nd form, the 1st magnetic body and the 2nd magnetic body oppose in the rotation position of the change gear at the time of locking. For this reason, the magnet brake which works so that a change gear stops in a short time at the end of change which requires braking force is realized.

  According to the third aspect, the first magnetic body and the second magnetic body are started to face each other before and after the engagement between the conversion roller and the escape surface of the cam portion is completed. That is, it is possible to start the braking force as the locking operation ends.

When the first magnetic body is a single body, the braking force can be increased by increasing the area of the magnetic body or by moving the mounting position of the magnetic body away from the shaft of the conversion gear. However, in the conversion process, the area where the brakes are applied is limited.
So, according to the 4th form, it becomes easy to comprise the area | region which works a brake by using the 1st magnetic body in multiple numbers. Further, the cost of the magnetic body for generating the same braking force is lower than that of a single body.

  According to the fifth aspect, the first magnetic body is provided at a position facing the second magnetic body at the time of stereotactic locking and at a position facing the second magnetic body at the time of reverse locking. Therefore, the same effect as any of the first to fourth embodiments can be exhibited regardless of the rotation angle of the conversion gear accompanying the conversion.

  According to the sixth embodiment, since the first magnetic body and / or the second magnetic body have a shape in which the facing area gradually increases after the mutual facing starts, the braking force acting during conversion Can be made to work efficiently.

  According to the seventh aspect, since the moving range of the first magnetic body and the installation position of the second magnetic body are covered by the cover portion, the same effect as any of the first to sixth aspects can be obtained. In addition to being obtained, iron powder can be prevented from entering around the magnetic body.

The top view which shows the periphery of the point for railroad tracks for demonstrating the usage type of an electric switch The longitudinal cross-sectional view which shows the structural example of the internal mechanism of an electric switch. It is a figure which shows the structural example of the magnet brake in 1st Embodiment, Comprising: (1) The partial top view of the surroundings of a change gear, (2) The enlarged view of the surroundings of a cam part. The state transition diagram for demonstrating operation | movement of the magnet brake in 1st Embodiment. The figure which shows the structural example of the magnet brake in 2nd Embodiment. The state transition diagram for demonstrating operation | movement of the magnet brake in 2nd Embodiment. The figure which shows the modification of a magnet brake. The figure which shows the modification of a magnet brake. The figure which shows the modification of a magnet brake.

[First Embodiment]
FIG. 1 is a plan view showing the periphery of a point for explaining a usage pattern of an electric switch in the present embodiment. The electric switch 100 in the present embodiment is fixed at a predetermined position with respect to the branching device 4 at the point 2 and is used by being connected to the branching device 4.

  The branching device 4 supports the movable rail 10 integrally connected by the connecting plate 8 on the floor plate 14 fixed to the sleeper 12 between the basic rails 6 so as to be slidable in the longitudinal direction of the sleeper. The sleepers in the vicinity of the tip of the movable rail 10 are made into a sleeper 12B that is longer than the ordinary sleeper 12, and an iron floor plate connected to the floor plate 14 at a portion extending outside the basic rail 6. 18 is installed.

  The electric switch 100 is fixed to the floor plate 18. Then, the connecting plate 8 is connected to the operation rod 102 via the tip 16, and the distal end portion of the movable rail 10 is connected to the locking rod 104 via the connection rod 20. Then, the rotational power generated by the motor 250 is converted into a linear motion of the operating rod 102 by the built-in conversion mechanism unit, and the branching device 4 is converted to the normal / inverted position, and the built-in locking mechanism unit By fixing, the fixed / inverted state of the movable rail 10 is fixed, and the state of the branching device 4 is not changed by the external force when passing through the railway vehicle.

  The electric switch 100 includes a circuit controller 110, a control relay 112, and an external terminal board 114 in an openable casing 101.

  Cables necessary for a signal with a power source or an external device (for example, an interlocking device) are collected on the external terminal board 114 and then pulled out as a signal cable bundle 109 from the housing 101. When the conversion command signal is received from the interlocking device, electric power is supplied from the control relay 112 to the motor 250, and the rotational force of the motor 250 is transmitted to the clutch, the reduction gear, and the conversion mechanism, and the electric switch 100 is unlocked by the conversion mechanism. , Conversion and locking are performed. Then, near the end of conversion, the circuit controller 110 shuts off the motor power supply, confirms the locked state of the locking mechanism, and transmits a conversion completion signal to the interlocking device.

  FIG. 2 is a longitudinal sectional view showing a configuration example of the internal mechanism of the electric switch 100 according to this embodiment. In order to facilitate understanding of the internal mechanism, the circuit controller 110, the control relay 112, the external terminal board 114, and the like are not shown.

  The casing 101 of the electric switch 100 according to this embodiment includes an upper casing 101U and a lower casing 101L corresponding to a case main body. The speed reduction mechanism unit 120 and the conversion lock mechanism unit 140 are housed in the lower housing 101L, and the motor 250 is fixed to the outer side surface (the left side surface in FIG. 2) of the lower housing 101L. The motor 250 has a built-in magnet clutch (not shown), but does not have a conventional magnetic brake directly connected to the rotor shaft.

  The drive shaft 202 of the motor 250 passes through the side portion of the housing 101 and is connected to the speed reduction mechanism portion 120 provided in the lower housing 101L, and the rotational power generated by the motor 250 is reduced by the speed reduction mechanism portion. The torque is converted to an appropriate torque at 120 and transmitted to the conversion lock mechanism 140.

  The reduction mechanism 120 includes, for example, a pinion gear 122 attached to the drive shaft 202 of the motor 250, a bevel gear 124 that meshes with the pinion gear 122, and an intermediate gear 128 that meshes with the first reduction gear 126 provided on the rotation shaft of the bevel gear 124. The second reduction gear 130 provided on the rotation shaft of the intermediate gear 128 and the conversion gear 132 that is the final gear meshing with the second reduction gear 130 are configured.

  The conversion lock mechanism 140 converts the rotational power decelerated by the speed reduction mechanism 120 into the linear motion of the operating rod 102, and locks / releases the locking rod 104, and is a known mechanism. It can be realized in the same way as a turning machine. For example, the conversion is realized by engaging the conversion roller 142 projecting from the lower surface of the conversion gear 132 and the cam portion 144 engraved in the operation rod 102 in a direction crossing the operation direction of the operation rod 102. Is done. Although not shown in the drawings, the lock is realized in the same manner as in the known technique. The conversion roller 142 is engaged with lock piece drive mechanisms 175 and 176 made of cam plates or the like to move the lock pieces 155 and 156. The position of the operation rod 102 is locked in a fixed / inverted position.

[Description of structure of magnet brake]
Then, the structure of the magnet brake in this embodiment is demonstrated, referring FIG.2 and FIG.3. FIGS. 3A and 3B are diagrams showing a configuration example of the magnet brake in the present embodiment, and are (1) a partial top view around the conversion gear and (2) an enlarged view around the cam portion.

  The magnet brake 300 according to the present embodiment is opposed to the first permanent magnet 302 (first magnetic body) provided on the upper surface of the conversion gear 132 in a fixed and inverted state (more specifically, locked). And a second permanent magnet 304 (second magnetic body) provided at a position to be magnetically coupled and a stator / cover portion 306.

The first permanent magnet 302 and the second permanent magnet 304 face each other with different polarities so as to be magnetically coupled to each other.
The stator / cover portion 306 corresponds to a fixed beam that passes the left and right wall portions of the lower housing 101L (the front and bottom wall portions in FIG. 2 and the upper and lower wall portions in FIG. 3). A circular recess 308 that opens downward is formed on the lower surface of the lower surface, and a shaft 134 of the conversion gear 132 is provided at the center of the circle. Therefore, the stator / cover portion 306 and the second permanent magnet 304 are fixedly provided at predetermined positions in the housing 101. In other words, it can be said that it is provided integrally with the housing 101.

  More specifically, the first permanent magnet 302 has an arc shape (arc band shape) with a predetermined width around the shaft 134 of the conversion gear 132, and is convexly provided on the lower surface of the conversion gear 132. It is installed at a position symmetrical with the conversion roller 142 (see FIG. 3).

  The second permanent magnet 304 has an arc belt shape centered on the shaft 134 and is fixed to the ceiling surface of the circular recess 308. When the conversion gear 132 is in a fixed / inverted state (locked state), the conversion gear 132 is fixed at a position facing the first permanent magnet 302 with a predetermined gap, and is fixed regardless of the rotation of the conversion gear 132. It is fixed to.

  The edge of the circular recess 308 is close enough to be slightly away from the upper surface of the conversion gear 132 (see FIG. 2), and the entry of dust such as iron powder from the outside to the circular recess 308 is suppressed. Preferably, as shown in the partially enlarged view in FIG. 2, it is preferable that the gap between the edge of the circular recess 308 and the upper surface of the conversion gear 132 is filled with an O-ring 310 or a rubber fin, and the circular recess 308 is substantially sealed. It is. In addition, the stator / cover portion 306 also produces a magnetic shielding effect.

  The strength of the magnetic force and the opposing area of the first permanent magnet 302 and the second permanent magnet 304 can be set as appropriate according to the required braking force. Further, since the stator / cover portion 306 and the second permanent magnet 304 only need to be fixedly provided at predetermined positions in the housing 101, the stator / cover portion 306 is provided as shown in FIGS. It may be assembled and fixed to the housing 101 as a separate part, or may be integrally formed with the housing 101 (for example, integrally formed on the back surface side of the upper housing 101U).

[Description of magnet brake operation]
FIG. 4 is a state transition diagram for explaining the operation of the magnet brake 300 in the present embodiment, in which (1) to (6) are changed from the fixed locked state to the inverted locked state (or vice versa). Shows the staged state of the conversion process. In order to facilitate understanding, the conversion gear 132, the conversion roller 142, and the first permanent magnet 302 are regarded as transparent bodies, and the relative positional relationship of the operating rod 102 that would otherwise be hidden under them is understood. It is shown for ease of operation.

  As shown in FIG. 4 (1), in the fixed locked state, the operating rod 102 is close to a predetermined side wall (upper side in FIG. 4) of the lower housing 101L, and the first permanent magnet 302 and the second permanent magnet. 304 is in an opposing state so as to overlap vertically. That is, the brake is applied by the attractive force of these permanent magnets.

  As shown in FIG. 4 (2), when the conversion operation starts, the first permanent magnet 302 starts to deviate from the position directly opposite to the second permanent magnet 304, and when the conversion roller 142 approaches the operation rod 102, The opposite is completely cancelled.

  As shown in FIG. 4 (3), when the conversion operation further proceeds and the conversion gear 132 rotates, the first permanent magnet 302 and the second permanent magnet 304 come out of the affected area where they attract each other, and the brake is completely released. It becomes. Then, the conversion roller 142 approaches the cam portion 144 of the operating rod 102, and finally comes into contact with the escape surface 144s of the cam portion 144 and enters the conversion surface 144t (see FIG. 3B). In this process, the lock piece 156 is separated from the operating rod 102, and the lock is released.

  When the conversion operation further proceeds, as shown in FIG. 4 (4), the conversion roller 142 enters the conversion surface 144t, and the conversion gear 132 and the operation rod 102 are engaged. As the conversion gear 132 rotates, the operating rod 102 moves to the opposite side (from the top to the bottom in the figure).

  As shown in FIG. 4 (5), when the operating rod 102 eventually reaches the inverted position, the conversion roller 142 is removed from the conversion surface 144t of the cam portion 144 to the escape surface 144s, and the operating rod 102 does not move any further. . When the conversion roller 142 comes off the cam portion 144, the first permanent magnet 302 and the second permanent magnet 304 come close to each other and start to face each other. As shown in FIG. 4 (6), when the two are in a frontal facing relationship, the magnetic coupling is maximized and the braking force is maximized.

  Energization of the motor 250 is cut at an appropriate timing in FIGS. 4 (5) to 4 (6), but the conversion gear 132 may continue to rotate due to the inertia of the rotor. However, by appropriately setting the magnetic force and opposing areas of the first permanent magnet 302 and the second permanent magnet 304, a braking force sufficient to cancel the inertia of the rotor of the motor 250 is exhibited. The same applies to the reverse conversion process from inversion to localization.

  As described above, according to the present embodiment, the second permanent magnet 304 is turned over so as to be magnetically coupled to face the first permanent magnet 302 at least at the rotational position of the conversion gear 132 when the operating rod 102 is locked. It is fixed to the housing side. And the arrangement position and shape of both are provided so that the opposing part does not arise at least while the conversion roller 142 is engaged with the conversion surface 144t of the cam portion 144. Therefore, to realize a turning machine equipped with a magnetic brake in which the brake force during the conversion hardly works, and yet the brake force works reliably in the stop state after the conversion (stereoscopic locked state and reverse locked state). Is possible.

  The brake does not work while the operation rod 102 is moving, and the brake works so that the rotation of the conversion gear 132 stops in a short time as soon as the lock is completed after the conversion, so that the load torque measurement is not affected. Therefore, an accurate load torque can be measured during maintenance of the turning machine. Further, it is not necessary for the measurer to train in advance to rotate at a constant speed. Of course, it is not necessary to subtract the brake torque from the measured value. In addition, since the brake is not working during the conversion, it is not necessary to drive the motor 250 against the brake torque during the conversion, thereby reducing power consumption and contributing to energy saving.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. This embodiment basically has the same configuration as that of the first embodiment, but in this embodiment, the rotation angle required for the conversion gear 132 to change the position / inversion is less than 360 °. The number and arrangement position of the magnetic bodies corresponding to the first permanent magnets 302 in the embodiment are changed. In addition, about the structure similar to 1st Embodiment, the same code | symbol is provided and description is abbreviate | omitted.

  FIG. 5 is a diagram illustrating a configuration example of the magnet brake 300B in the present embodiment. The magnet brake 300 </ b> B of the present embodiment includes a first permanent magnet 302, a second permanent magnet 304, and a third permanent magnet 305.

  The third permanent magnet 305 is a permanent magnet having the same polarity and the same size as the first permanent magnet 302. The first permanent magnet 302 and the third permanent magnet 305 are both disposed on the upper surface of the conversion gear 132. More specifically, it is arranged at a line-symmetrical position with respect to the gear diameter connecting the shaft 134 and the mounting shaft of the conversion roller 142. The relative angle around the axis 134 of the first permanent magnet 302 and the third permanent magnet 305 (the obtuse angle θ in the figure) is the same as the rotation angle required for the conversion gear 132 in the present embodiment for conversion.

  FIG. 6 is a state transition diagram for explaining the operation of the magnet brake 300B in the present embodiment, in which (1) to (6) are changed from the fixed locked state to the inverted locked state (or vice versa). It shows the staged state of the conversion process. In order to facilitate understanding, the conversion gear 132, the conversion roller 142, the first permanent magnet 302, and the third permanent magnet 305 are regarded as transparent bodies, and the operation rod 102 that would otherwise be hidden under them. The relative positional relationship is shown so that it can be easily understood.

  The basic operation is the same as in the first embodiment. However, in the localization state in the present embodiment, as shown in FIG. 6A, the first permanent magnet 302 and the second permanent magnet 304 are opposed to each other, and the brake works by magnetic coupling.

When the conversion operation proceeds, as shown in FIGS. 6 (2) to 6 (4), the opposing positional relationship between the first permanent magnet 302 and the second permanent magnet 304 shifts, and the brake does not work during the conversion operation.
Then, as shown in FIG. 6 (5) to FIG. 6 (6), as the conversion is completed, the third permanent magnet 305 and the second permanent magnet 304 approach each other, and are magnetically coupled to perform braking again. Come to work.

[Modification]
As described above, the embodiments to which the present invention is applied have been described. However, the application forms of the present invention are not limited to these, and additions, omissions, and modifications of components may be appropriately made without departing from the gist of the invention. it can.

  Moreover, in the said embodiment, although the shape of the permanent magnet was made into circular arc belt shape, a shape, a number, and an arrangement position can be changed and set suitably. For example, as shown in FIG. 7, it may be a crescent moon type. Or the shape which tapered both ends of the circular arc shape may be sufficient. In this case, the influence of the magnetic force can be gradually increased or decreased in the process in which the permanent magnets approach or separate from each other.

  For example, as shown in FIG. 8, it is good also as a rectangle long in a radial direction. In this case, since the permanent magnet having the existing shape can be used, the effect of reducing the procurement cost can be expected. In consideration of procurement costs, it is also possible to use a disk or columnar shape that is a general magnet shape. In this case, as shown in FIG. 9, the first permanent magnet 302 and the second permanent magnet 304 can be constituted by a magnetic body group in which a plurality of discs and cylindrical small magnets are closely arranged. In this case, it is preferable to arrange them so as to be line-symmetric with respect to a line segment connecting the rotation shaft 134 of the conversion gear 132 and the conversion roller 142. Moreover, it is good also as making variable the influence degree of a magnetic force in the process in which a permanent magnet adjoins or separates with the arrangement pattern.

  Further, as shown in the above-described embodiments and modifications, the shapes of the first permanent magnet 302, the second permanent magnet 304, and the third permanent magnet 305 are not limited to the same or similar shapes. The shapes shown in FIGS. 3, 7, 8, and 9 may be combined as appropriate.

2 ... Point 4 ... Branch 6 ... Basic rail 8 ... Connecting plate 10 ... Moveable rail 12 ... Sleeve 12B ... Folding sleeper 14 ... Floor plate 16 ... Flip bar 18 ... Plate 20 TETSU machine 101 ... housing 101U ... upper housing 101L ... lower housing 102 ... operating rod 103 ... maintenance space 104 ... lock lock rod 109 ... signal cable bundle 110 ... circuit controller 112 ... control relay 114 ... external terminal board 120 ... Deceleration mechanism 122 ... Pinion gear 124 ... Bevel gear 126 ... Deceleration gear 128 ... Intermediate gear 130 ... Deceleration gear 132 ... Conversion gear 134 ... Shaft 140 ... Conversion locking mechanism 142 ... Conversion roller 144 ... Cam part 144s ... Escape surface 144t ... Conversion surface 153 ... Locking plate 154 ... Locking plate 155, 156 ... Lock piece 175,176 Lock piece drive mechanism 202 ... drive shaft 250 ... motor 300 ... magnet brake 302 ... first permanent magnet (first magnetic body)
304: Second permanent magnet (second magnetic body)
305 ... Third permanent magnet (first magnetic body)
306 ... Stator and cover part 310 ... O-ring (O-ring)

Claims (7)

A turning machine that drives the operation rod by engaging a conversion roller provided in the conversion gear and a cam portion of the operation rod,
A first magnetic body provided at a predetermined position on the rotation surface of the conversion gear and rotating together with the conversion gear;
Provided at a position that does not oppose the first magnetic body while the conversion roller is engaged with the conversion surface of the cam portion by generating a braking force by being magnetically coupled when facing the first magnetic body. A second magnetic body formed,
A tumble machine equipped with. The second magnetic body is fixedly provided at a predetermined position in the housing so as to face the first magnetic body at a rotational position of the conversion gear when the operating rod is locked. A tipping machine as described in The second magnetic body is moved back and forth after the engagement position between the conversion roller and the cam portion transitions from the conversion surface of the cam portion to the escape surface, and then the engagement with the escape surface ends. 3. The turning machine according to claim 1, wherein the first magnetic body has a shape to be opposed to the first magnetic body. The rolling according to any one of claims 1 to 3, wherein a plurality of the first magnetic bodies are provided at positions symmetrical to each other with respect to a line segment connecting a rotation shaft of the conversion gear and the conversion roller. Tetsu machine. The first magnetic body is provided at a position facing the second magnetic body at the time of stereotactic locking and a position facing the second magnetic body at the time of reverse locking. A tipping machine according to any one of the above. The first magnetic body and / or the second magnetic body have a shape in which the facing area gradually increases after the opposing gears start to rotate with the rotation of the conversion gear. A tipping machine according to any one of the above. The switch machine according to any one of claims 1 to 6, further comprising a cover portion that covers a moving range of the first magnetic body and an installation position of the second magnetic body.

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