JP2008208856A - Power transmission change-over mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission change-over mechanism which is inexpensive and simplified in structure. <P>SOLUTION: The power transmission change-over mechanism comprises: a shaft 1 rotatably and slidably supported in right and left trestles 2, 3; a driving gear 5 of a first transmission system spur gear 4 slidably installed in one side of the shaft 1; and a driving gear 11 of a second transmission system spur gear 10 journaled to the other side of the shaft, and is comprised of: a coil spring 17 wound around the shaft between a spring seat 15 fixedly installed in the shaft 1 and the first driving system driving gear 4 between the first transmission system and the second transmission system driving gears; and a collar 21 slidably and loosely fitted in the shaft 1 so that the first driving system driving gear 5 is also moved as a handle 18 is moved between a handle 18 slidably installed in one side end of the shaft 1 and the first driving system driving gear 4. The shaft 1 is formed to such a length that the right end is projected from the right side trestle 3 a little. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a power transmission mechanism when the left or right side of the table needs to be moved separately in the horizontal direction, for example, when a work piece is displaced when performing various operations on the table. The present invention relates to a power transmission switching mechanism for switching between left and right so as to be selectable.

As a conventional power transmission switching device of this type, a slide gear 102 that is always meshed with a drive source M is slidable on a slide shaft 101, and is swingable on a worm 105 fixed to a motor shaft Ma1 of a forward / reverse motor M1. The worm wheel 106 is engaged with the elastic member 107 connected to the swing fulcrum side of the worm wheel 106 to the slide gear 102, and stoppers 103 and 104 are provided on the slide shaft 101, When the slide gear 102 that is slidable on the slide shaft 101 comes into contact with the stopper 103, the slide gear 102 meshes with the transmission gear 111 a fixed to the first transmission shaft 111 of the first transmission system and contacts the stopper 104. When the contact position is reached, the gear is engaged with a transmission gear 112a fixed to the transmission shaft 112 in the second transmission system. In this way, the first transmission gear 111a or the second transmission gear 112a is selectively meshed with either the first transmission gear 111a or the second transmission gear 112a depending on the sliding position of the slide gear 102 sliding on the sliding shaft 101. One that can switch the transmission of power has been proposed (Patent Document 1).
Japanese Patent Laid-Open No. 10-47444

  In the above-mentioned Patent Document 1, a swingable worm wheel 106 is engaged with a worm 105 fixed to a motor shaft Ma1 of a forward / reverse rotation motor M1, and a swing fulcrum side of the worm wheel 106 is connected to an elastic coupling body 107. By connecting this to the slide gear 102 and bringing the slide gear 102 into contact with the stoppers 103 and 104 provided on the slide shaft 101, the power transmission is selectively switched. There is a problem that a motor, a worm, a worm foil, etc. are required, the structure is complicated, and the cost is high. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a power transmission switching mechanism with a low cost and a simple configuration.

  In order to achieve the above object, a power transmission switching mechanism according to the present invention is provided with a shaft that is freely and slidably fitted to left and right bases, and is slidably provided on the left side of the shaft. A drive gear of a first transmission system bevel gear and a drive gear of a second transmission system bevel gear fixed to the right side of the shaft, the shaft between the first transmission system and the drive gear of the second transmission system A coil spring wound around a shaft between a fixed spring seat and the drive gear of the first drive system; a handle slidably provided at the left end of the shaft; and a drive gear of the first drive system And a collar that is slidably fitted to the shaft provided to move the drive gear together with the movement of the handle, and the right end of the shaft is more than the right base. It is characterized by having a length that protrudes slightly.

  The power transmission switching mechanism according to the present invention includes a drive gear of a first drive system bevel gear provided on the left side of the shaft so as to be axially slidable and a bevel gear of the second drive system fixed to the right side of the shaft. A coil spring between a spring seat fixed between the drive gears of the first drive system and the second drive system provided on the shaft and the drive gear of the first drive system. The collar is slidably fitted to the shaft between the handle provided on the left end of the shaft so as to be slidable with respect to the shaft and the drive gear of the first drive system. Since the right end thereof is configured to protrude slightly from the right base, the second shaft is fixed to the shaft if the shaft is moved to the left against the elasticity of the coil spring. The drive gear of the bevel gear of the drive system moves with the shaft, the meshing with the driven gear is released, and the rotation of the shaft is transmitted only by the bevel gear of the first drive system. Rukoto can.

  To release the meshing of the bevel gear of the first drive system, the handle provided at the left end is pushed to the right, and accordingly, the handle is moved between the handle and the drive gear of the bevel gear of the first drive system. Along with the movement, the driving gear also pushes the collar loosely fitted on the shaft provided to move, and as a result, the driving gear of the first driving system is moved to the right against the urging force of the coil spring. And can be disengaged from the driven gear.

  As described above, in the present invention, when the engagement of the bevel gear of the first drive system is released due to the presence of the collar and the coil spring loosely fitted to the shaft, the shaft does not move and the handle is operated. The movement of the driving gear of the bevel gear is possible by the movement of the collar, and the shaft is operated against the urging force of the coil spring by operating the handle when releasing the meshing of the bevel gear of the second drive system. Thus, the drive gear fixed to the shaft can be moved by the movement, and the release of the meshing of any bevel gear can be easily performed by operating the handle.

  The embodiment of the present invention will be described. FIG. 1 shows a state in which the drive gear and the driven gear of the bevel gears of the first and second drive systems are both meshed, and FIG. 2 shows the bevel gear of the second drive system. 3 shows a state when the meshing is released, and FIG. 3 shows a state when the meshing of the bevel gear of the first drive system is released. To explain this, 1 is a shaft, and the shaft 1 is The pedestals 2 and 3 are pivotally supported so as to be rotatable and slidable. A bevel gear 4 of a first drive system is provided on the left side of the shaft 1 and inside the left gantry 2, and a key groove (in the drawing) is formed in the axial direction of the inner peripheral surface of the drive gear 5 of the bevel gear 4. The drive gear 5 is rotatable by engaging the key groove formed in the drive gear 5 with the key 8 provided in the shaft 1 and having a required length in the axial direction. It is configured to be slidable in the axial direction. Reference numeral 7 denotes a driven gear of a bevel gear that meshes with the drive gear 5.

  A bevel gear 10 of the second drive system is provided on the right side of the shaft 1 and inside the right gantry 3, and the drive gear 11 of the bevel gear 10 is fixed to the shaft 1. Reference numeral 12 denotes a driven gear of the bevel gear 10 that meshes with the drive gear 11. The drive gear 5 of the first drive system bevel gear 4 and the drive gear 11 of the second drive system bevel gear 10 are both configured as the bevel gears 4 and 10 with their back sides facing inward.

  Reference numeral 15 denotes a spring seat fixed to the shaft 1, and the spring seat 10 is provided slightly to the left of the center of the shaft 1, and the rear portion of the drive gear 5 of the bevel gear 4 of the first drive system described above. Is provided with a spring seat 16, and a coil spring 17 is wound around the shaft 1 between the spring seat 15 and the spring seat 16.

  Reference numeral 18 denotes a handle provided with a key groove (not shown) to be engaged with a key 19 formed with a required length on the shaft 1 at the left end of the shaft 1. The shaft 1 is rotated by the keyway and is slidable in the axial direction. Reference numeral 21 denotes a collar that is slidably fitted to the shaft 1 with one end in contact with the handle 18 and the other end in contact with the drive gear 5 of the first drive system. Accordingly, the collar 21 has a length corresponding to the distance between the handle 18 and the drive gear 5, and the drive gear 5 of the first drive system can be moved simultaneously with the movement of the handle 18. It is something that can be done. Further, the above-described shaft 1 has a length protruding from the right gantry 3 by a length L. The length L may be a length that allows the drive gear 11 of the bevel gear 10 of the second drive system to be disengaged from the driven gear 12. Reference numeral 22 denotes a stopper fixed to the left end of the shaft 1, and reference numeral 23 denotes a stopper fixed to the right end of the shaft 1.

  Since this embodiment is configured as described above, its operation will be described. The left and right first drive system bevel gears 4 and the second drive system bevel gear 10 of the shaft 1 are wound around the shaft 1. Energized by the coil spring 17, both the bevel gears 4 and 10 are engaged with each other. At this time, if the handle 18 is manually rotated, the driven gears 7 and 12 of the first driving system bevel gear 4 and the second driving system bevel gear 10 are rotated, and screw shafts fixed to the driven gears 7 and 12 are rotated. 24 and 25 are rotated and the table 26 is moved in the front-rear direction by a conventionally known mechanism connected to the screw shafts 24 and 25, but various operations are performed on the table. When the work on the table is slightly displaced from the machining tool or the like, it is necessary to move only one of the tables 26 in a plane in order to eliminate the displacement. In such a case, in the present embodiment, this can be easily performed by performing the following operation.

  When only the bevel gear 4 of the first drive system is rotated and the power of the first drive system is transmitted to a necessary mechanism, the handle 1 is moved manually in the direction of the arrow A, so that the shaft 1 Of the handle 18 against the urging force of the coil spring 17 wound between the fixed spring seat 15 and the spring receiving seat 16 provided on the back side of the drive gear 4 of the bevel gear 4 of the first drive system. It is moved in the moving direction (A direction). At this time, since the shaft 1 is configured with a length L that slightly protrudes from the right frame 3, there is no difficulty in moving the shaft 1 to the left (direction A), and the shaft 1 can be moved easily. As a result, the meshing of the drive gear 11 and the driven gear 12 of the bevel gear 10 of the second drive system can be released. At this time, the bevel gear 4 of the first drive system is in an engaged state, and the bevel gear 4 of the first drive system can be rotated by manually rotating the handle 18 in this state. Further, when returning the bevel gear 10 of the second drive system to the original meshed state, the handle 18 is moved so as to be pushed back to the original state, and the original state is easily obtained in combination with the restoring force of the coil spring 17. The bevel gear 10 of the second drive system is meshed.

  When the meshing of the drive gear 5 and the driven gear 7 of the bevel gear 4 of the first drive system is released and the bevel gear 11 of the second drive system is rotated to transmit only the second drive system, When the handle 18 having a key groove engaged with the key 19 provided at the left end portion of 1 and slidable on the shaft 1 is manually moved in the direction of arrow B, the handle 18 and the first drive system The drive gear 5 of the bevel gear 4 is loosely fitted to the shaft 1 so that both ends of the handle gear 18 and the drive gear 5 are brought into contact with each other so as to move the drive gear 5 together with the movement of the handle 18. The driving gear 5 is moved to the right (in the direction of arrow B) against the coil spring 17 by the collar 21 and the meshing of the driving gear 5 of the bevel gear 4 and the driven gear 9 is released. At this time, the bevel gear 10 of the second drive system remains in the meshed state, and if the handle 18 is manually rotated in this state, necessary work can be performed by the second drive system. In order to return to the original engagement, if the handle 18 is moved in the opposite direction, it can be easily brought into engagement with the restoring force of the coil spring 17.

  When the meshing of the bevel gear 4 of the first drive system and the bevel gear 10 of the second drive system is released, the means for stopping in the same state is selected by manually rotating the handle in the released state. The bevel gear of the drive system can be rotated, and it is only necessary to immediately return to the original meshing state after the work is completed, but the means for stopping in the released state can be easily implemented by a notch or the like. .

  As described above, according to the present embodiment, the drive gear 5 of the bevel gear 4 of the first drive system is configured to be rotatable and slidable on the shaft 1, and the drive gear 5 is moved along with the movement of the handle 18. At the time of releasing the meshing of the bevel gear 4 of the first drive system by the collar 21 which is constituted by the distance between the handle 18 and the drive gear 5 to be moved together and is loosely fitted to the shaft 1. It is possible to release the meshing of the bevel gear 4 by moving the drive gear 5 of the bevel gear 4 by the movement of the collar 21 without moving the shaft 21, and the meshing of the bevel gear 10 of the second drive system. At the time of releasing, the movement of the drive gear 11 fixed to the shaft 1 can be easily performed by moving the shaft 1 against the urging force of the coil spring 17. Can be implemented simply by It is intended to achieve the practical effect of the.

  The present invention enables switching of power transmission with a mechanically simple configuration, can be attached to an off-the-shelf machine, etc., and the operation is manual, can be easily performed, and can be provided at low cost. This also has a practical effect.

Explanatory drawing when the bevel gears of the first drive system and the second drive system are both meshed Explanatory drawing when the meshing of the bevel gear of the second drive system is released Explanatory drawing when the meshing of the bevel gear of the first drive system is released Explanatory drawing of a conventional power transmission switching device

Explanation of symbols

1 axis
4 Bevel gear 5 of the first drive system 5 Drive gear 10 Bevel gear 11 of the second drive system 11 Drive gear 17 Coil spring 18 Handle 21 Color

Claims (1)

A shaft freely and slidably fitted to the left and right bases, a drive gear of a first transmission bevel gear provided slidably on the left side of the shaft, and a shaft fixed to the right side of the shaft A drive gear of a bevel gear of the second transmission system, and between a spring seat fixed to the shaft between the drive gear of the first transmission system and the second transmission system and the drive gear of the first drive system In order to move the drive gear together with the movement of the handle between the coil spring wound around the shaft and the handle slidably provided on the left end of the shaft and the drive gear of the first drive system. A power transmission switching characterized by comprising a collar slidably fitted to the shaft, the shaft having a right end protruding slightly from the right base. mechanism.

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