JP2012112115A - Shunt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shunt that securely performs a proper switching operation for a longer time than in a conventional shunt.SOLUTION: A shunt which performs a switching operation by engaging a partial pinion gear 144 driven by power of a drive mechanism part with a rack 150 provided in an operating rod 102 to move the operating rod 102, comprises a cam part (an urging cam 148) coaxially rotating with the partial pinion gear 144, for pressing and moving the operating rod in a switching operation direction by abutting on a roller part (a first roller 154 or a second roller 156) provided in the operating rod 102 when the switching operation is finished.

Description

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

  As a conventional turning machine, the operating rod is linearly moved in the direction of the switching operation by a rack formed by providing a tooth row on a part of the operating rod and a partial pinion gear lacking a portion of the tooth row. A tipping machine having a rack and pinion mechanism is known (see, for example, Patent Document 1).

In this turning machine, the first engagement member fixed coaxially with the partial pinion gear and the second engagement portion provided on the operating rod immediately before the engagement between the rack and the partial pinion gear is released. It is arranged at a relative value that can be contacted with the movement rod and restricts movement of the operating rod in the reverse direction.
Specifically, as shown by reference numeral 13 in FIG. 2 of Patent Document 1, the first engagement member is a partially different diameter plate provided coaxially with the partial pinion gear, and the partial pinion gear A portion having a larger diameter than the tip circle is formed on the side lacking the teeth, and a portion having a smaller diameter than the tip circle is formed on the portion having the teeth of the partial pinion gear. The outer peripheral side surface of the former large-diameter portion functions as an engagement surface that comes into contact with the second engagement portion to which reference numeral 22 is attached. In the latter small diameter portion, the diameter is insufficient and does not reach the second engaging portion, and becomes the non-engageable portion. Immediately before the engagement between the rack and the partial pinion gear is released, the engagement surface of the first engagement member comes into sliding contact with the second engagement portion, and the contact state is maintained even if the engagement is released. Therefore, even if the operating rod tries to move in the opposite direction, the large-diameter portion of the first engagement member and the second engagement surface come into contact with each other and restrict the movement.
Such a switch can be used in such a manner that the operating rod is linked to the switch rod of the branching device via the escape crank, and the direction of the operating rod changes along the direction of the rail.

  In addition, as an arrangement layout and a connecting configuration of the switch and the branching device, the operation rod is directly connected to the rotation rod, and the direction of the operation rod conversion operation can be used in a form substantially orthogonal to the rail (for example, , See Patent Document 2).

JP-A-11-157448 JP 2001-163221 A

  It has been found that when the above-described turning machine of Patent Document 1 is arranged and used so that its operating rod is orthogonal to the rail, there are the following problems.

FIG. 12 and FIG. 13 are diagrams for explaining the problem. For these figures, reference numerals are given based on the drawings of Patent Document 1, and in the following description, they are indicated with parentheses.
As shown in FIG. 12, the rolling machine described in Patent Document 1 is such that the regulating surface (13a) of the lock body (13) abuts on the regulated portion (22a or 22b) of the operating rod (20). It has a structure that regulates the movement of the operating rod (20). When the pinion (12) is rotated, the regulating surface (13a) of the lock body (13) and the regulated portion (22a or 22b) of the operating rod (20) are in sliding contact with each other, so that the sliding contact portion is worn. .

  Then, when the tipping machine is used for a long period of time, the rack (21) and the pinion (12) are disengaged due to an increase in wear of the sliding contact portion, and the locking surface (13) is restricted ( When the 13a) and the regulated portion (22a or 22b) of the operating rod (20) are to contact, there may be a gap Gp between them. Even if such a gap Gp occurs, in the state shown in FIG. 12, an external force in the direction of engagement with the pinion (12) (the direction of the arrow X1) does not act on the operating rod (20). If (20) does not move in the direction of the arrow X1 by the external force, no problem occurs. Then, if the pinion (12) rotates in the meshing direction (arrow RR direction) with the rack (21), the restriction on the restricted portion (22a or 22b) by the restriction surface (13a) is released and at the same time the pinion (12 ) And the rack (21) mesh appropriately, and the operating rod (20) moves in the direction of the arrow X1.

  As seen in FIG. 5 of Patent Document 1, the turning machine is arranged so that its operating rod is parallel to the rails (R1, R2), and the operating rod switches the branching device via the escape crank. When used in this way, when the train passes over the turnout (100), even if the train lateral pressure is applied to the movable rails (T1, T2), the force works only by applying the lateral pressure to the escape crank. It does not act or is extremely unlikely to act as an external force in the movement direction (arrow X1 direction) with respect to the kite (20). Therefore, a problem is unlikely to occur when the turning machine is arranged so that its operating rod (20) is parallel to the rail and the branching device is switched via the escape crank.

  However, when the rolling machine described in Patent Document 1 is used so that its operation rod (20) is orthogonal to the rails (R1, R2), the train passes over the branching unit (100). When train lateral pressure is applied to the movable rails (T1, T2), the force acts as an external force in the moving direction (arrow X1 direction) with respect to the operating rod (20), or is extremely easy to act. It becomes.

  Then, in the state where the gap Gp shown in FIG. 12 is generated, an external force in the meshing direction (arrow X1 direction) with the pinion (12) acts on the operating rod (20), and the external force causes the gap Gp to be reduced. After the movement rod (20) has moved in the direction of the arrow X1 so as to fill, when the pinion (12) rotates in the meshing direction with the rack (21) (in the direction of the arrow RR) as shown in FIG. Since the engagement start position of the pinion (12) and the rack (21) is deviated only, the teeth (12a) of the pinion (12) and the rack (rack teeth 21) are improperly in contact with each other. Inappropriate wear or scraping. A portion where the rack (rack tooth 21) is worn or scraped improperly in this manner is exaggerated by a broken line (22) in FIG.

  Such deformation of the tooth profile due to inappropriate wear or the like is caused when the pinion (12) rotates in the direction of the arrow RL and moves the operation rod (20) in the arrow direction X2 during the subsequent rolling operation. (20) brings about a decrease in the amount of movement, leading to an increase in the sliding contact force between the regulating surface (13a) of the lock (13) and the regulated portion (22a or 22b) of the operating rod (20). Helps the wear of the contact.

  If the above phenomenon is repeated, there is a possibility that an appropriate falling operation may not be performed.

  An object of the present invention is to solve the above-mentioned problems and to provide a turning machine capable of reliably performing an appropriate turning action over a longer period than before.

  A first form for solving the above-described problem is that the partial pinion gear driven by the power of the drive mechanism unit meshes with the rack provided on the operating rod and moves the operating rod to perform a conversion operation. Which rotates on the same axis as the partial pinion gear and hits the roller portions (for example, the first roller 154 and the second roller 156 in FIG. 2) provided at the operation rod at the end of the conversion operation. This is a turning machine provided with a cam portion (for example, an urging cam 148 in FIG. 2) that contacts and pushes the operating rod in the direction of conversion operation.

  More preferably, as a second form, the cam portion starts to push the roller immediately before the partial pinion gear and the rack are disengaged, and the end teeth of the partial pinion gear are separated from the rack. A first type of turning machine having a moving radius can be configured.

  Even more preferably, as a third form, the cam portion has a moving radius that maintains a terminal tooth of the partial pinion gear in a state of being separated from the rack after completion of the conversion operation. A tipping machine of the second form can be configured.

  Further, as a fourth form, it rotates coaxially with the partial pinion gear and engages with a lock fixing plate (for example, a locked body 152 in FIG. 2) provided on the operating rod after the conversion operation. Thus, it is possible to constitute a turning machine of any one of the first to third forms further provided with a lock rotating plate (for example, the lock body 146 of FIG. 2) for locking the operating rod.

  Further, as a fifth form, the cam portion comes into contact with the roller portion before the locking rotary plate engages with the lock fixing plate by the coaxial rotation of the partial pinion gear. A fourth type of turning machine having a moving radius that pushes and moves can be configured.

  Still further, as a sixth mode, the cam portion disengages the lock rotation plate and the lock fixing plate by coaxial rotation of the partial pinion gear when the operating rod is unlocked. Then, the fourth or fifth type of turning machine having a moving radius that is separated from the roller portion can be configured.

  Still further, as a seventh form, the cam portion abuts on the roller portion to push and move the operating rod by the coaxial rotation of the partial pinion gear when the operating rod is unlocked. The roll of any one of the first to sixth forms having a moving radius that is defined in a range in which the tooth at the starting end of the partial pinion gear does not contact the second tooth of the rack until it meshes with the first tooth of the rack. One machine can be configured.

According to the embodiment of the present invention, at the end of the conversion operation, the roller portion provided on the operating rod is provided with the cam portion that rotates coaxially with the partial pinion gear immediately before the meshing between the partial pinion gear and the rack is released. The operating rod can be pushed and moved in the direction of the switching operation. Therefore, when the teeth of the partial pinion gear and the teeth of the rack that are meshed with each other are separated from each other, it is possible to suppress tooth galling and wear of those teeth. Then, by appropriately setting the moving radius of the cam portion, it is possible to prevent inappropriate wear when the teeth that are meshed at the end are separated from each other.
Therefore, it is possible to provide a turning machine capable of reliably performing an appropriate turning action over a longer period than before.

The top view which shows the periphery of the point for railroad tracks for demonstrating the usage type of the electric switch in embodiment. The enlarged view which shows selectively the conversion mechanism part in embodiment. AA sectional drawing of FIG. The elements on larger scale and the partial detail figure for demonstrating the mode of the conversion mechanism part from the start of conversion operation to completion. The elements on larger scale and the partial detail figure for demonstrating the mode of the conversion mechanism part from the start of conversion operation to completion. The elements on larger scale and the partial detail figure for demonstrating the mode of the conversion mechanism part from the start of conversion operation to completion. The elements on larger scale and the partial detail figure for demonstrating the mode of the conversion mechanism part from the start of conversion operation to completion. The elements on larger scale and the partial detail figure for demonstrating the mode of the conversion mechanism part from the start of conversion operation to completion. The elements on larger scale and the partial detail figure for demonstrating the mode of the conversion mechanism part from the start of conversion operation to completion. The elements on larger scale and the partial detail figure for demonstrating the mode of the conversion mechanism part from the start of conversion operation to completion. The figure which shows the modification of a conversion mechanism part. The figure which shows the state with which the lock | rock part was abraded in the conventional turning machine which used the rack & pinion mechanism for the conversion mechanism part. The figure which shows the state which started conversion operation | movement from the state of FIG.

  FIG. 1 is a plan view showing the vicinity of a railroad track point for explaining how to use the electric switch in this embodiment. In addition, a part of the upper lid of the case of the electric switch is cut so that the inside of the case can be seen.

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 of the railway track, 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 operating rod 102 via the rolling rod 16, and the distal end portion of the movable rail 10 is connected to the locking rod 104 via the connecting rod 20.

  The electric switch 100 includes an openable case 101, a circuit controller 110, a control relay 112, an external terminal plate 114, a speed reduction mechanism 120, a conversion mechanism 140, a locking mechanism ( Each mechanism part (not shown) is incorporated. The side portion of the case 101 includes a drive mechanism unit 200 that integrates the brake 260, the motor 250, and the clutch unit 210.

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 from the case 101 as a cable bundle 109.
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 unit 210, the speed reduction mechanism unit 120, and the conversion mechanism unit 140. A series of operations of unlocking, converting, and locking the electric switch 100 is performed. Then, at the end of the 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 an enlarged view that selectively shows the conversion mechanism 140 in the present embodiment. 3 is a cross-sectional view taken along line AA in FIG.
The conversion mechanism unit 140 converts the rotational power decelerated by the speed reduction mechanism unit 120 into a linear motion of the operating rod 102. For example, the conversion mechanism unit 140 includes a partial pinion gear 144, a locking body 146, and an urging cam 148 fixed to a rotation shaft 142 that is coaxial with the conversion gear 132. These are coaxially fixed adjacent to each other in the order of the partial pinion gear 144, the locking body 146, and the urging cam 148 from the conversion gear 132 side (the left side in FIG. 3).

In addition, the conversion mechanism 140 includes (1) a rack 150 formed of a dentition provided on the operating rod 102, (2) a locked body 152 fixed beside the rack, and (3) the chain. Two first rollers 154 and second rollers 156 which are roller portions protruding outward from the lock body (the right side in FIG. 3), and (4) a first stopper protruding from the operating rod 102 158 and a pair of second stoppers 160.
Compared with the configuration of Patent Literature 1, the lock body 146 corresponds to the first engagement member of Patent Literature 1, and the locked body 152 corresponds to the second engagement portion of Patent Literature 1.

  A general pinion gear has teeth on the entire circumference, whereas the partial pinion gear 144 is a gear lacking about half a tooth. The portion lacking the teeth has a smaller diameter than the root circle. The partial pinion gear 144 is disposed so as to be able to mesh with the rack 150 of the operating rod 102.

  The lock body 146 is a partially different-diameter plate in which the disk is partially reduced in diameter, and has a substantially half-moon-shaped large-diameter portion 146a having a diameter larger than the tip circle of the partial pinion gear 144, and the partial pinion gear 144. And a small-diameter portion 146b having a smaller diameter than the root circle. The large-diameter portion 146a straddles the tooth missing portion of the partial pinion gear 144, and both ends of the large-diameter portion 146a are applied to the teeth at both ends of the partial pinion gear 144 (starting tooth 144a to terminal tooth 144b).

  The biasing cam 148 is a partially different-diameter plate in which a substantially half-moon-shaped portion is left from a disk having a larger diameter than the large-diameter portion 146a of the lock body 146, and the remainder is partially reduced in diameter. The half moon portion is referred to as a cam portion 148a. In other words, a change in the diameter of the substantially meniscus portion forms a cam moving radius (so-called cam profile) in the cam mechanism.

  The locked body 152 is a plate member having a thickness that is the same as or slightly thinner than the locked body 146, and has a first concave curved surface having the same curvature as the diameter of the large-diameter portion 146 a of the locked body 146 at the left and right corners. 152a and a second concave curved surface 152b. Then, the first concave curved surface 152a and the second concave curved surface 152b are fixed to the front side as shown in FIG.

  More specifically, the first concave curved surface 152a and the second concave curved surface 152b are respectively located between the second left end second tooth 150a from the left end of the rack 150 and the second right end second tooth 150b from the right end. It is arranged like that. In other words, the locked body 152 is disposed on substantially the same surface as the rotation surface of the lock body 146, and when the two approach each other, (1) the rack 150 is on the right relative to the rotation shaft 142. The outer peripheral side surface of the large diameter portion 146a is in sliding contact with the first concave curved surface 152a, and (2) when the rack 150 is relatively left with respect to the rotating shaft 142, the outer peripheral side surface of the large diameter portion 146a is It can be in sliding contact with the second concave curved surface 152b.

  The first roller 154 and the second roller 156 are portions that are urged and pushed in contact with the outer periphery of the urging cam 148 and correspond to the receiving surface of the cam. The first roller 154 and the second roller 156 are realized by, for example, a structure in which an annular part is pivotally supported around an axis, and the annular part protrudes further forward than the locked body 152 toward FIG. It is provided to do.

  When the urging cam 148 rotates about the rotation shaft 142, (1) when the rack 150 is on the right relative to the rotation shaft 142, the outer peripheral side surface of the cam portion 148a contacts the first roller 154. (2) When the rack 150 is on the left relative to the rotating shaft 142, the outer peripheral side surface of the cam portion 148 a can contact the second roller 156. In this embodiment, the portion that is urged and pushed by the urging cam 148 is composed of two rollers, the first roller 154 and the second roller 156, but the cam portion 148a has a larger diameter. 2 may be realized by providing one roller at the center of the left and right of the first roller 154 and the second roller 156 in FIG.

[Description of operation]
Next, operation | movement around the conversion mechanism part 140 of the electric switch 100 in this embodiment is demonstrated in detail. 4 to 10 are a partially enlarged view and a partial detail view thereof for explaining the state of the conversion mechanism 140 from the start to the completion of the conversion operation for moving the operation rod 102 in the X1 direction (left direction in the figure). And they are numbered in chronological order.

  FIG. 4 shows a state where the conversion operation is started. In the state at the start time, the partial pinion gear 144 and the rack 150 are not engaged with each other. At this time, the outer peripheral side surface of the large-diameter portion 146a of the lock body 146 is in contact with the first concave curved surface 152a of the lock body 152. In the detailed view of part B, the biasing cam 148 is shown in a transparent manner so that the engagement relationship between the lock body 146 and the locked body 152 is clear.

  The left and right of the operating rod 102 are inserted and guided by the insertion hole 101 a of the case 101. Even if the operating rod 102 tries to move in the X1 direction, the first concave curved surface 152a is stopped by the large diameter portion 146a, so that the operating rod 102 does not move in the X1 direction (locked state). In addition, the first roller 154 is in contact with the outer peripheral side surface of the cam portion 148a of the biasing cam 148. This contact can also restrict the movement of the operating rod 102 in the X1 direction.

  That is, even if wear occurs on the contact surface between the locking body 146 and the locked body 152 and a gap Gp (see FIG. 12) is generated as in the prior art, the contact between the biasing cam 148 and the first roller 154 The locked state is maintained by the regulation by.

  If there is a gap between the urging cam 148 and the first roller 154, the movement restricting function is not exhibited, but the urging cam 148 and the first roller 154 are in rolling contact in the first place. Therefore, a gap due to wear is extremely difficult to occur.

  Now, when the rotating shaft 142 is driven clockwise from the state of FIG. 4, as shown in FIG. 5, the outer peripheral side surface of the large-diameter portion 146 a of the locked body 146 and the first concave curved surface of the locked body 152. The contact with 152a is released. That is, the lock by the lock body 146 and the locked body 152 is unlocked. On the other hand, even at this stage, the outer peripheral side surface of the cam portion 148 a of the urging cam 148 is kept in contact with the first roller 154. At this time, the tooth 144a at the starting end of the partial pinion gear 144 is not in contact with any tooth of the rack 150.

  When the rotating shaft 142 further rotates clockwise, as shown in FIG. 6 (in the detailed view of the portion D, the locking body 146, the urging cam 148, and the locked body 152 are shown in a transparent manner), the urging cam 148 first. The contact between the outer peripheral side surface of the cam portion 148a and the first roller 154 is released. Next, the start tooth 144a first comes into contact with the first left end first tooth 150c from the left end of the rack 150 as shown in FIG. 6, and the rotational force of the rotating shaft 142 starts to be converted into the direct power of the operating rod 102.

  FIG. 7 shows a state during the conversion operation when the rotating shaft 142 further rotates clockwise. Due to the meshing of the partial pinion gear 144 and the rack 150, the operating rod 102 is moved in the X1 direction.

  When the rotating shaft 142 further rotates clockwise and the rack 150 relatively reaches the left side of the rotating shaft 142, the engagement between the partial pinion gear 144 and the rack 150 is released as shown in FIG. Immediately before the engagement is released, more specifically, the contact position between the second right end second tooth 150b from the right end of the rack 150 and the terminal tooth 144b of the partial pinion gear 144 is the right end second tooth 150b. Prior to reaching the tooth tip, the cam portion 148a of the biasing cam 148 comes into contact with the second roller 156, and biases and pushes the roller in the X1 direction. A dashed line in the detail view of the E portion indicates the position of the right end second tooth 150b when it is assumed that the biasing cam 148 does not “contact” the second roller 156. That is, the biasing cam 148 biases the second roller 156 and slightly pushes it in the direction of the change operation, so that the contact pressure between the terminal tooth 144b of the partial pinion gear 144 and the right end second tooth 150b of the rack 150 is increased. Can be reduced and wear can be suppressed.

Therefore, it can be said that the moving radius of the cam portion 148a of the biasing cam 148 is defined as follows. That is, the moving diameter of the cam portion 148a is set so that the second roller 156 starts to be pushed immediately before the partial pinion gear 144 and the rack 150 are disengaged, and the terminal tooth 144b of the partial pinion gear 144 is separated from the rack 150. Yes.
More specifically, the radial diameter of the urging cam 148 is maintained so that the right end second tooth 150b is separated from the terminal tooth 144b in the X1 direction and the separated state is maintained even if the rotating shaft 142 further rotates clockwise. Is determined.

When the engagement between the partial pinion gear 144 and the rack 150 is released and the cam portion 148a of the biasing cam 148 comes into contact with the second roller 156, the operation of the operation rod 102 in the current conversion operation is substantially completed. become.
When the rotary shaft 142 further rotates clockwise from there, as shown in FIG. 9 (the biasing cam 148 is transparently shown in the detailed view of the F portion), the outer peripheral side surface of the large-diameter portion 146a of the lock body 146 is The second locked surface 152b provided at the upper right end of the body to be locked 152 is brought into proximity or sliding contact with the second concave curved surface 152b to be locked. That is, even if the operating rod 102 tries to go backward in the X2 direction, it is restricted by the locking body 146 and the locked body 152 and cannot move. In addition, the moving diameter of the cam portion 148a of the biasing cam 148 is set so as to maintain the terminal tooth 144b of the partial pinion gear 144 away from the rack 150. Roller 156 also maintains contact. Therefore, the retrograde restriction of the operation rod 102 by these becomes effective.

  If the meshing between the partial pinion gear 144 and the rack 150 is released and the rotation shaft 142 is rotated to a predetermined angle that the locking by the locking body 146 and the locked body 152 is considered to be completed, The motor 250 is controlled to stop rotating, and the conversion operation for moving the operation rod 102 in the X1 direction is completed as shown in FIG. 10 (in the detailed view of the G section, the biasing cam 148 is transparent).

  The conversion operation for moving the operation rod 102 in the X2 direction is realized by performing the operation in the reverse order of the description of the operation so far (in the descending order from FIG. 10 to FIG. 4).

  As described above, according to the present embodiment, at the end of the conversion operation, immediately before the engagement between the partial pinion gear 144 and the rack 150 is released, the biasing cam 148 that rotates coaxially with the partial pinion gear 144 is The operating roller can be pushed and moved in the direction of the changing operation by contacting the first roller 154 or the second roller 156 provided in 102. Accordingly, when the teeth of the partial pinion gear 144 that are meshed with the teeth of the rack 150 are separated from each other in the reverse direction, it is possible to suppress tooth galling and wear of those teeth.

[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.

  For example, the moving radius of the biasing cam 148 can be changed as appropriate. As shown in FIG. 11, the moving radius of the urging cam 148 is set so that the cam portion 148 a maintains a contact state with the first roller 154 or the second roller 156 at the start and end of the conversion operation. Then, since it can be said that the locked state can be maintained, the locked body 146 and the locked body 152 can be omitted.

2 Point 4 Branching device 16 Rolling rod 100 Electric rolling device 102 Operating rod 140 Conversion mechanism 142 Rotating shaft 144 Partial pinion gear 146 Locking body
146a Large diameter part
146b Small diameter portion 148 Energizing cam
148a Cam part 150 Rack 152 Locked body
152a First concave curved surface
152b Second concave curved surface 154 First roller 156 Second roller

Claims (7)

A partial pinion gear driven by the power of the drive mechanism unit and a rack provided on the operating rod mesh with each other and move by moving the operating rod.
A rolling machine provided with a cam portion that rotates coaxially with the partial pinion gear and abuts against a roller portion provided on the operating rod and pushes the operating rod in the direction of the switching operation at the end of the converting operation. . 2. The rolling device according to claim 1, wherein the cam portion has a moving radius that starts pressing the roller immediately before the partial pinion gear and the rack are disengaged, and separates a terminal tooth of the partial pinion gear from the rack. 3. Tetsu machine. 3. The turning machine according to claim 1, wherein the cam portion has a moving radius that maintains a terminal tooth of the partial pinion gear in a state of being separated from the rack after completion of the conversion operation. Further provided with a lock rotation plate that rotates coaxially with the partial pinion gear and locks the operation rod by engaging with a lock fixing plate provided on the operation rod after the conversion operation.
The turning machine according to any one of claims 1 to 3. The cam portion has a moving radius that pushes the operating rod by contacting the roller portion before the locking rotary plate engages with the lock fixing plate by coaxial rotation of the partial pinion gear. 4. A tipping machine according to item 4. The cam portion is separated from the roller portion after the engagement between the lock rotating plate and the lock fixing plate is released by the coaxial rotation of the partial pinion gear when the operating rod is unlocked. The turning machine according to claim 4 or 5, wherein the turning machine has a moving radius. The cam portion abuts the roller portion to push and move the operating rod, and when the operating rod is unlocked, the tooth at the start of the partial pinion gear is rotated by the coaxial rotation of the partial pinion gear. The turning machine according to any one of claims 1 to 6, which has a moving radius that is defined in a range that does not contact the second teeth of the rack until the first teeth are engaged.

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