JP5533634B2 - Gear rotation lock mechanism - Google Patents

Description

  The present invention relates to a gear rotation lock mechanism that locks the rotation of a gear.

A related gear rotation lock mechanism is described in Patent Document 1.
The rotation lock mechanism of the gear of patent document 1 is a mechanism used in a screw type clamp. As shown in FIG. 10, the gear rotation lock mechanism includes a switching latch 114, and a ball 117 and a spring 118 that hold the switching latch 114 in a first position (see FIG. 10) and a second position. ing. Then, the ball 117 presses the first receiving surface 114a of the switching latch 114, and the first protrusion 115 of the switching latch 114 is engaged with the gear 102 (first position). Rotation of the handle 110 in the right direction (B arrow) is prohibited. That is, the rotating body 100 can be rotated rightward (B arrow) by the handle 110. Further, in this state, the left rotation (A arrow) of the handle 110 with respect to the rotating body 100 is allowed, and the handle 110 is rotated left (A arrow) while the rotating body 100 is held by a member to be tightened (not shown). be able to.
When the switching latch 114 is switched to the second position, that is, the ball 117 presses the second receiving surface 114b of the switching latch 114 and the second protrusion 116 is engaged with the gear 102, On the contrary, the left rotation (A arrow) of the handle 110 with respect to the rotating body 100 is prohibited, and the right rotation (B arrow) is allowed against the spring 118.

JP 2004-188510 A

However, the gear rotation lock mechanism described above cannot lock the gear in both forward and reverse directions.
Here, as a structure for locking the gear in both the forward and reverse directions, a configuration using the meshing action of the worm 120 and the worm wheel 122 is conceivable as shown in FIG. That is, the worm wheel 122 can be locked in both the forward and reverse directions by stopping the worm 120 with the motor 124. However, with this configuration, for example, if the worm 120 is held in a stopped state due to a failure of the motor 124 or the like, there is a problem that the rotation lock of the worm wheel 122 cannot be released.

  The present invention has been made to solve the above-mentioned problems, and the problem to be solved by the present invention is that the gear can be locked in both forward and reverse directions and can be easily unlocked. Is to do so.

The above-described problems are solved by the inventions of the claims.
The invention of claim 1 is inserted into a tooth gap of a gear and inserted into another tooth gap of the gear, and a first insertion member capable of holding down the tooth surface of the tooth constituting the tooth groove, Insert a second insertion member capable of holding down the tooth surface of another tooth constituting the tooth gap, and the first insertion member and the second insertion member into the corresponding tooth gap, or the tooth An actuator configured to be able to be pulled out from the groove, the forward rotation of the gear is prohibited in a state where the first insertion member presses the tooth surface of the tooth, and the second insertion member is A rotation lock mechanism for a gear having a configuration in which the reverse rotation of the gear is prohibited while pressing a tooth surface of another tooth , wherein the first insertion member and the second insertion member are formed in a band plate shape. Each base end is pivotally supported by a separate support pin. The first insertion member and the second insertion member are connected in such a way that the midway positions in the longitudinal direction intersect with each other, and the intersecting portion is relatively rotatable by a connection pin. The two insertion members relatively rotate around the connecting pin so that the distal end portion of the first insertion member and the distal end portion of the second insertion member approach each other, whereby the distal end portion of the first insertion member and the second insertion portion The distal end portion of the insertion member is configured to be inserted into a corresponding tooth groove of the gear.

According to the present invention, the first insertion member and the second insertion member are inserted into the corresponding tooth spaces by the operation of the actuator, respectively, and the tooth surface of the tooth is pressed by the first insertion member, The tooth surface of the other tooth can be pressed by the insertion member. Thereby, normal rotation and reverse rotation of the gear are prohibited. That is, the gear can be locked in both forward and reverse directions.
In addition, the gear can be easily unlocked by pulling out the first insertion member and the second insertion member from the corresponding tooth spaces by the operation of the actuator.
Furthermore, since the first insertion member and the second insertion member are coupled via the coupling pin, the first insertion member and the second insertion member can be simultaneously operated by one actuator. Become.

According to the second aspect of the present invention, the first insertion member and the second insertion member are formed with long hole-shaped cam holes through which the connection pins pass, and the functions of the connection pins and the cam holes are as follows. The movement trajectory between the distal end portion of the first insertion member and the distal end portion of the second insertion member is set.

According to the invention of claim 3 , the first insertion member and the second insertion member are configured to receive the rotational force of the gear at the end face in the longitudinal direction, and the rotational force of the gear is the first insertion member or the first insertion member. The first insertion member and the second insertion member are arranged so as to be added in the longitudinal direction of the two insertion members.
That is, the rotational force of the gear is applied to the first insertion member or the second insertion member so as to press the first insertion member and the second insertion member from the longitudinal direction. Accordingly, the rotational force of the gear can be received at the portion where the strength of the first insertion member or the second insertion member is the greatest, and the first insertion member and the second insertion member are thinned to reduce the weight. It becomes possible to plan.

According to a fourth aspect of the present invention, the actuator includes an elastic body that constantly biases the first insertion member and the second insertion member in the insertion direction.
For this reason, it is possible to move the first insertion member and the second insertion member in the pulling direction against the elastic force of the elastic body, and the lock can be released even when the actuator fails.
According to a fifth aspect of the present invention, the actuator includes a solenoid that moves the first insertion member and the second insertion member in the pull-out direction against the elastic force of the elastic body.

  According to the present invention, the gear can be locked in both forward and reverse directions. In addition, the lock can be easily released.

It is a side view showing the rack and pinion mechanism provided with the rotation lock mechanism of the gear concerning Embodiment 1 of the present invention. It is a model side view showing a table slide mechanism. It is the side view (A figure) showing the rotation lock mechanism of the gearwheel which concerns on Embodiment 1 of this invention, and a partially broken side view (B figure). It is IV-IV arrow directional cross-sectional view of FIG. 3 (A). It is a model side view showing lock release operation | movement of the rotation lock mechanism of a gearwheel. It is a model side view showing the normal lock operation | movement of the rotation lock mechanism of a gearwheel. It is a model side view showing the normal lock operation | movement of the rotation lock mechanism of a gearwheel. It is a model side view showing lockable operation | movement of the rotation lock mechanism of a gearwheel. It is a model side view showing lockable operation | movement of the rotation lock mechanism of a gearwheel. It is a side view showing the rotation lock mechanism of the conventional gearwheel. It is a partially broken side view showing the conventional rotation lock mechanism of a gear.

[Embodiment 1]
The gear rotation lock mechanism according to the first embodiment of the present invention will be described below with reference to FIGS. The gear rotation lock mechanism according to the present embodiment is a mechanism for locking the rotation of the pinion of the rack and pinion mechanism used in the table slide mechanism.
Here, the front, rear, left, right, and top and bottom described in the figure correspond to the front, back, left, right, and top and bottom of the table slide mechanism.

<About the table slide mechanism 10>
First, before describing the gear rotation lock mechanism 30, the table slide mechanism 10 will be briefly described.
The table slide mechanism 10 is a mechanism for sliding the horizontal movable table 12 back and forth with respect to the table support base 14 as shown in the schematic diagram of FIG. The table slide mechanism 10 includes a rack and pinion mechanism 20 as a drive mechanism for sliding the movable table 12 back and forth. As shown in FIGS. 1 and 2, the rack and pinion mechanism 20 includes a rack 22 fixed to the lower surface of the movable table 12 so as to extend in the front-rear direction, a motor fixed to the table support base 14 side, and The pinion 25 is fixed to an output shaft 24p of a speed reducer 24 (hereinafter referred to as a motor 24), and a gear rotation lock mechanism 30 that locks the rotation of the pinion 25.

<About the gear rotation lock mechanism 30>
The gear rotation lock mechanism 30 is a mechanism for locking the pinion 25 in both forward and reverse directions. As shown in FIGS. 1, 3A, and 3B, the gear rotation lock mechanism 30 includes a first insertion member 31, a second insertion member 32, a coupling mechanism 34, a solenoid 36, and a coil spring. 38.
The first insertion member 31 is a member that prohibits counterclockwise rotation (forward rotation) of the pinion 25, and as shown in FIG. The base end portion of the first insertion member 31 has a semicircular end surface, and a through hole 31k is formed in the base end portion of the first insertion member 31 so as to be coaxial with the semicircle. Yes. And the support pin part 15p of the 1st support member 15 fixed to the vertical wall 14w of the table support stand 14 is penetrated by the through-hole 31k of the 1st insertion member 31 as shown in FIG.

As shown in FIG. 4, the first support member 15 is fixed at a right angle to the vertical wall 14 w of the table support base 14, and a ring-shaped step 15 d is provided at the tip of the first support member 15. The support pin portion 15p is formed coaxially. The support pin portion 15p of the first support member 15 is inserted into the through hole 31k of the first insertion member 31 and the ring-shaped step 15d presses the back surface of the first insertion member 31. The removal prevention ring 15r of the first insertion member 31 is attached to the tip of the first insertion member 31. Accordingly, the first insertion member 31 can be turned up and down around the support pin portion 15p of the first support member 15.
As shown in FIG. 3 (A), an elongated cam hole 31a is formed at a position near the tip of the center of the first insertion member 31. Further, an insertion corner portion 31k configured to be inserted into the tooth groove 25m of the pinion 25 is formed at the distal end portion of the first insertion member 31. And the front end surface 31f of the insertion corner | angular part 31k is comprised so that the tooth surface 25e of the pinion 25 can contact | abut.

The second insertion member 32 is a member that prohibits the right rotation (reverse rotation) of the pinion 25, and is formed symmetrically with the first insertion member 31 as shown in FIG. That is, a through hole 32k is formed in the base end portion of the second insertion member 32, and the second hole fixed to the vertical wall 14w of the table support gantry 14 in the through hole 32k as shown in FIG. A support pin portion 16p of the support member 16 is inserted. The second support member 16 is fixed at a right angle to the vertical wall 14 w of the table support base 14 at a position diagonally forward and upward of the first support member 15. And the support pin part 16p is coaxially formed in the front-end | tip part of the 2nd support member 16 via the ring-shaped level | step difference (illustration omitted). The support pin portion 16p of the second support member 16 is inserted into the through hole 32k of the second insertion member 32, and the ring-shaped step holds the back surface of the second insertion member 32. The removal prevention ring 16r of the second insertion member 32 is attached to the tip. As a result, the second insertion member 32 can be turned up and down around the support pin portion 16 p of the second support member 16.
As shown in FIG. 3 (B), a slotted cam hole 32a is formed at a position near the center of the second insertion member 32, and a tooth groove 25m of the pinion 25 is formed at the tip. An insertion corner portion 32k configured to be insertable is formed. And the front end surface 32f of the insertion corner | angular part 32k is comprised so that abutment with the tooth surface 25e of the pinion 25 is possible.

  As shown in FIG. 3 and the like, the coupling mechanism 34 is a mechanism for coupling the intersection of the first insertion member 31 and the second insertion member 32 with the solenoid 36. The coupling mechanism 34 includes a strip-shaped coupling bar 34b and a coupling pin 34p, and the coupling bar 34b is located between the first insertion member 31 and the second insertion member 32 as shown in FIG. Is arranged. A connecting pin 34p formed so as to protrude perpendicularly from the front surface and the back surface of the connecting bar 34b is provided at the tip position of the connecting bar 34b. And the connection pin 34p which protruded to the surface side of the connection bar 34b is penetrated by the cam hole 31a of the 1st insertion member 31, as shown to FIG. 3 (A). Further, the connecting pin 34p protruding to the back side of the connecting bar 34b is inserted through the cam hole 32a of the second insertion member 32 as shown in FIG. In other words, the first insertion member 31 and the second insertion member 32 are connected to each other so as to be rotatable relative to each other by the action of the connection pin 34p and the cam holes 31a and 32a.

As shown in FIG. 3 and the like, a pin hole 34n is formed at the base end portion of the connecting bar 34b, and the base end portion of the connecting bar 34b is connected to the drive shaft 36j of the solenoid 36 using the pin hole 34n. It is connected by a split pin 36p (see FIG. 1).
As shown in FIG. 1, the solenoid 36 includes a solenoid body 36m and the drive shaft 36j. The solenoid body 36m is attached to a predetermined position of the vertical wall 14w (see FIG. 4) of the table support base 14 so that the drive shaft 36j of the solenoid 36 is disposed on the extension line of the connection bar 34b of the connection mechanism 34. Yes.
A coil spring 38 is mounted around the drive shaft 36j of the solenoid 36. The coil spring 38 is biased so that the drive shaft 36j protrudes from the solenoid body 36m in the axial direction in a state where the energization of the solenoid body 36m is released. When the solenoid body 36m is energized, the drive shaft 36j is pulled into the solenoid body 36m against the spring force of the coil spring 38.

<Operation of Gear Rotation Locking Mechanism 30>
First, the unlocking operation of the gear rotation lock mechanism 30 will be described.
When releasing the rotation lock of the pinion 25 of the rack and pinion mechanism 20, the solenoid body 36m of the solenoid 36 is energized (energization on). As a result, the drive shaft 36j of the solenoid 36 is pulled into the solenoid body 36m against the spring force of the coil spring 38, and the connection bar 34b of the connection mechanism 34 is pulled by the drive shaft 36j. Move down. Then, as the connecting bar 34b moves diagonally forward and downward, the connecting pin 34p provided at the tip position of the connecting bar 34b moves diagonally forward and downward. As a result, the connecting pin 34p pulls the inner wall surfaces of the cam holes 31a, 32a of the first insertion member 31 and the second insertion member 32 obliquely downward in the front direction. As a result, as shown in FIG. 5, the first insertion member 31 rotates to the left about the support pin portion 15p, and the second insertion member 32 rotates to the right about the support pin portion 16p. The insertion corner portion 31k of the first insertion member 31 and the insertion corner portion 32k of the second insertion member 32 are each pulled out from the tooth groove 25m of the pinion 25. As a result, the rotation lock of the pinion 25 is released.

  When the rotation of the pinion 25 is locked, the energization of the solenoid body 36m of the solenoid 36 is released (energization off). As a result, the drive shaft 36j of the solenoid 36 protrudes in the axial direction from the solenoid body 36m by the spring force of the coil spring 38, and the connection bar 34b of the connection mechanism 34 is pushed by the drive shaft 36j and moves rearward and obliquely upward in FIG. When the connecting pin 34p moves rearward and diagonally upward together with the connecting bar 34b, the connecting pin 34p presses the inner wall surfaces of the cam holes 31a and 32a of the first insertion member 31 and the second insertion member 32 rearward and upward. . Thereby, as shown in FIG. 6, the first insertion member 31 rotates to the right around the support pin portion 15p, and the second insertion member 32 rotates to the left around the support pin portion 16p. As a result, the distal end portion of the first insertion member 31 and the distal end portion of the second insertion member 32 move toward the pinion 25 (moves rearward and obliquely upward) while approaching each other, so that the first insertion member 31 is moved. One tooth 25z of the pinion 25 is sandwiched between the distal end portion of the second insertion member 32 and the distal end portion of the second insertion member 32. Then, the insertion corner portion 31k of the first insertion member 31 and the insertion corner portion 32k of the second insertion member 32 are respectively inserted into the tooth grooves 25m of the pinion 25 formed on both sides of the teeth 25z. Thereby, the rotation of the pinion 25 is locked.

When the pinion 25 is rotated counterclockwise (forward rotation) by the motor 24 in the rotation locked state shown in FIG. 6, it is sandwiched between the first insertion member 31 and the second insertion member 32 as shown in FIG. The tooth surface 25e of the tooth 25z located next to the tooth 25z comes into contact with the distal end surface 31f of the first insertion member 31. That is, since the distal end surface 31f of the first insertion member 31 presses the tooth surface 25e of the pinion 25, the left rotation (forward rotation) of the pinion 25 is prohibited. At this time, as indicated by a thick arrow in FIG. 7, the rotational force of the pinion 25 is applied in the longitudinal direction of the first insertion member 31.
Further, when the pinion 25 is rotated rightward (reversely) in the rotation locked state shown in FIG. 6, the pinion 25 is positioned next to the lower side of the tooth 25 z sandwiched between the first insertion member 31 and the second insertion member 32. The tooth surface 25e of the tooth 25z comes into contact with the distal end surface 32f (see FIG. 7) of the second insertion member 32. Thereby, the right rotation (reverse rotation) of the pinion 25 is prohibited. Also at this time, the rotational force of the pinion 25 is applied in the longitudinal direction of the second insertion member 32.

  Here, in the rotation locked state, as shown in FIG. 8, the teeth 25 z of the pinion 25 are sandwiched between the distal end portion of the first insertion member 31 and the distal end portion of the second insertion member 32. Even in this case, if the tooth surface 25e of the adjacent tooth 25z on the sandwiched tooth 25z is in contact with the distal end surface 31f of the first insertion member 31, the left rotation (forward rotation) of the pinion 25 is prohibited. . Further, when the pinion 25 rotates rightward (reversely) from this state, the tooth surface 25e of the tooth 25z adjacent to the sandwiched tooth 25z comes into contact with the tip surface 32f of the second insertion member 32, Right rotation (reverse rotation) of the pinion 25 is prohibited.

Further, when the two teeth 25z of the pinion 25 are sandwiched between the distal end portion of the first insertion member 31 and the distal end portion of the second insertion member 32 as shown in FIG. The pinion 25 is rotated and locked after being rotated by one tooth 25z.
That is, when the pinion 25 rotates counterclockwise (forward rotation), the sandwiched lower teeth 25z are disengaged from between the first insertion member 31 and the second insertion member 32, and adjacent to the sandwiched teeth 25z. The tooth surface 25e of the tooth 25z abuts on the distal end surface 31f of the first insertion member 31. Thereby, the left rotation (forward rotation) of the pinion 25 is prohibited.
Further, when the pinion 25 rotates rightward (reversely) from the state of FIG. 9, the pinched upper teeth 25z come off between the first insertion member 31 and the second insertion member 32, and the pinched teeth 25z The tooth surface 25e of the lower adjacent tooth 25z comes into contact with the distal end surface 32f of the second insertion member 32. Thereby, the right rotation (reverse rotation) of the pinion 25 is prohibited.
Here, if the solenoid 36 is out of order in the rotation lock state, the connection bar 34b of the connection mechanism 34 is manually moved diagonally forward and downward against the spring force of the coil spring 38, so that the rotation lock state is established. Can be released.
That is, the solenoid 36 and the coil spring 38 correspond to the actuator of the present invention.

<Advantages of the gear rotation lock mechanism 30 according to the present embodiment>
According to the rotation lock mechanism 30 of the gear according to the present embodiment, the first insertion member 31 and the second insertion member 32 are respectively inserted into the corresponding tooth grooves 25m by the operations of the solenoid 36 and the coil spring 38 (actuator). Thus, the tooth surface 25e of the tooth 25z can be pressed by the first insertion member 31, and the tooth surface 25e of another tooth 25z can be pressed by the second insertion member 32. Thereby, normal rotation and reverse rotation of the pinion 25 (gear) are prohibited. That is, the pinion 25 (gear) can be locked in both forward and reverse directions.
Further, the operation of the solenoid 36 makes it possible to easily unlock the pinion 25 (gear) by pulling out the first insertion member 31 and the second insertion member 32 from the corresponding tooth spaces 25m.

Further, since the first insertion member 31 and the second insertion member 32 are coupled via the coupling pin 34p, the first insertion member 31 and the second insertion member 32 are simultaneously coupled to one actuator (solenoid). 36 etc.).
Further, the rotational force of the pinion 25 is applied to the first insertion member 31 or the second insertion member 32 so as to press the first insertion member 31 and the second insertion member 32 from the longitudinal direction. Become. For this reason, the rotational force of the pinion 25 can be received at the portion where the strength of the first insertion member 31 or the second insertion member 32 is the largest, and the first insertion member 31 and the second insertion member 32 are It is possible to reduce the thickness by reducing the thickness.
Further, since the first insertion member 31 and the second insertion member 32 can be moved in the pulling direction against the spring force of the coil spring 38 in the rotation locked state, when the solenoid 36 fails Etc. can be unlocked.

<Example of change>
Here, the present invention is not limited to the above-described embodiment, and can be modified without departing from the gist of the present invention. For example, in the present embodiment, the first insertion member 31 and the second insertion member 32 are crossed and connected by a connection pin 34p, and both the insertion members 31 and 32 are operated simultaneously by a single solenoid 36. Indicated. However, a configuration in which two sets of solenoids 36 are provided and the first insertion member 31 and the second insertion member 32 are individually operated by each solenoid 36 is also possible. Further, when the first insertion member 31 and the second insertion member 32 are individually operated, the first insertion member 31 and the second insertion member 32 are connected to one end side and the other side with the center of the pinion 25 interposed therebetween. It is also possible to arrange them on the end side.
In the present embodiment, the rotation lock mechanism of the pinion 25 of the rack-and-pinion mechanism 20 has been described. However, the present invention can be applied to a circular gear other than the pinion 25.

25... Pinion (gear)
25z ... tooth 25m ... tooth gap 25e ... tooth surface 31 ... first insertion member 31a ... cam hole 31f ... tip surface 32 ... second insertion member 32f ... Tip surface 32a ... Cam hole 34p ... Connecting pin 36 ... Solenoid (actuator)
36j ... Drive shaft (actuator)
38 ... Coil spring (actuator)

Claims (5)

A first insertion member that is inserted into the tooth gap of the gear and can hold down the tooth surface of the tooth that constitutes the tooth gap;
A second insertion member that is inserted into another tooth gap of the gear and can hold down the tooth surface of another tooth constituting the tooth gap;
An actuator configured to insert the first insertion member and the second insertion member into the corresponding tooth spaces, or to be pulled out from the tooth spaces,
Forward rotation of the gear is prohibited with the first insertion member holding the tooth surface of the tooth, and reverse rotation of the gear is performed with the second insertion member holding the tooth surface of the other tooth. A gear rotation lock mechanism that is prohibited ;
The first insertion member and the second insertion member are formed in a band plate shape, and each base end portion is rotatably supported by separate support pin portions,
The intermediate positions in the longitudinal direction of the first insertion member and the second insertion member intersect with each other, and the intersecting portion is connected so as to be relatively rotatable by a connection pin,
The distal ends of the first insertion member and the distal end portion of the second insertion member are rotated relative to each other so that the distal end portion of the first insertion member and the distal end portion of the second insertion member approach each other. And a distal end portion of the second insertion member are inserted into corresponding tooth spaces of the gear. A rotation lock mechanism for a gear according to claim 1,
The first insertion member and the second insertion member are formed with elongated cam holes through which the connection pins pass, and the first insertion is performed by the function of the connection pins and the cam holes. A rotation lock mechanism for a gear, wherein a movement locus between a tip portion of the member and a tip portion of the second insertion member is set . A gear rotation lock mechanism according to any one of claims 1 and 2 ,
The first insertion member and the second insertion member are configured to receive the rotational force of the gear at an end face in the longitudinal direction, and the rotational force of the gear is the longitudinal length of the first insertion member or the second insertion member. A rotation locking mechanism for a gear , wherein the first insertion member and the second insertion member are arranged so as to be added in a direction . A rotation lock mechanism for a gear according to any one of claims 1 to 3,
The gear rotation lock mechanism , wherein the actuator includes an elastic body that constantly biases the first insertion member and the second insertion member in the insertion direction . A gear rotation lock mechanism according to claim 4 ,
The gear rotation lock mechanism according to claim 1, wherein the actuator includes a solenoid that moves the first insertion member and the second insertion member in a pulling direction against an elastic force of the elastic body .

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