JP3220825U - Cam device - Google Patents

Abstract

An object of the present invention is to provide a cam device in which overrun of an output table is suppressed at low cost.
A roller gear cam device 1 has a first rotation shaft (input shaft 12) and a cam groove 11, and is rotatable about a first rotation shaft. A roller gear cam (barrel cam) 10; A rotating member (output table 20) that includes an output shaft 22) and a plurality of cam followers 21 and rotates about the second rotation shaft as the roller gear cam rotates by engaging the cam grooves with the cam followers; And a drive unit (servo motor 30) for driving and rotating the rotation shaft to rotate the roller gear cam. When the drive unit is in the energized state, the restraint of the first rotary shaft is released to make the roller gear cam and the rotatable member rotatable, and when the drive unit is in the non-energized state, the first rotary shaft is restrained. Then, a restraining portion 40 which makes the roller gear cam and the rotating member non-rotatable is provided at a position different from the drive portion.
[Selected figure] Figure 3

Description

  The present invention relates to a cam device.

  It has an input shaft and a cam groove, has a cam rotatable around the input shaft, an output shaft and a plurality of cam followers, and when the cam groove and the cam follower are engaged, it rotates around the output shaft as the cam rotates. A cam device provided with an output table and a servomotor for driving and rotating an input shaft to rotate a cam is already well known.

  Then, when the power supply of the servomotor is suddenly de-energized due to a power failure or the like, the drive shaft of the servomotor is restrained from rotating by the servo lock function so that the output table does not overrun around the output shaft. (See, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 6-296383

  However, in the method of restraining the drive shaft of the servomotor in a non-rotatable manner, the drive shaft of the servomotor and the input shaft are generally coupled by coupling via the reduction gear, etc. An overrun of the output table occurred due to play (gear backlash, clearance at the fastening portion, etc.).

  Therefore, when the overrun due to the play becomes a problem, conventionally, the output table is directly restrained from being rotated by the restraint device, thereby suppressing the overrun of the output table. However, according to such a method, there is a problem that the cost increases and the restraint device becomes complicated because the restraint device for restraint also needs to be enlarged (restraint force) along with the enlargement of the output table.

  The present invention has been made in view of such problems, and an object of the present invention is to realize a cam device in which overrun of the output table is suppressed at low cost.

  The main device for achieving the above object is provided with a first rotation shaft and a cam groove, and comprises a roller gear cam (barrel cam) rotatable around the first rotation shaft, a second rotation shaft and a plurality of cam followers. When the cam groove and the cam follower are engaged, a rotating member that rotates around the second rotation shaft along with the rotation of the roller gear cam (barrel cam), and the roller by driving and rotating the first rotation shaft And a drive unit configured to rotate a gear cam (barrel gear cam), wherein, when the drive unit is in an energized state, the restraint of the first rotation shaft is released to move the roller gear cam (barrel cam) and The rotation member is set to be rotatable, and when the drive unit is not energized, the roller gear cam (barrel cam) and the rotation member can not be rotated by restraining the first rotation shaft. That restraint portion, the said drive unit is a cam device, characterized in that provided in the different positions.

  Other features of the present invention will be apparent from the description of the present specification and the accompanying drawings.

  According to the present invention, it is possible to realize a cam device in which overrun of the output table is suppressed at low cost.

FIG. 1 is a perspective view showing the appearance of the roller gear cam device 1. FIG. 2 is a perspective view showing the inside of the roller gear cam device 1. FIG. 3 is a perspective view showing the main part of the roller gear cam device 1 in cross section. The left view of FIG. 4 is a cross-sectional view of the restraint portion 40 when the restraint portion 40 is not energized, and the right view of FIG. 4 is a cross-sectional view of the restraint portion 40 when the restraint portion 40 is energized. FIG. 5 is a perspective view showing the appearance of the barrel cam device 100. As shown in FIG. FIG. 6 is a perspective view showing the inside of the barrel cam device 100. As shown in FIG. FIG. 7 is a view showing a state in which the cam groove 111 and the cam follower 121 of the barrel cam device 100 are engaged.

  At least the following matters will be made clear by the present specification and the description of the accompanying drawings.

  A roller gear cam having a first rotation shaft and a cam groove, and rotatable about the first rotation shaft, a second rotation shaft and a plurality of cam followers, and the cam groove and the cam follower being engaged with each other A cam device comprising: a rotating member that rotates around the second rotation shaft with rotation of a roller gear cam; and a driving unit that drives and rotates the first rotation shaft to rotate the roller gear cam. When the drive unit is in the energized state, the restriction of the first rotary shaft is released to make the roller gear cam and the rotating member rotatable, and when the drive unit is in the non-energized state, A cam device characterized in that a restraining portion for restraining the first rotation shaft to make the roller gear cam and the rotating member unrotatable is provided at a position different from the drive portion.

  According to such a cam device, it is possible to realize a roller gear cam device in which overrun of the output table is suppressed at low cost.

  The barrel cam includes a first rotation shaft and a cam groove, and includes a barrel cam rotatable about the first rotation shaft, a second rotation shaft, and a plurality of cam followers, and the cam groove and the cam follower are engaged with each other. It is a cam apparatus provided with the rotation member which rotates around the said 2nd rotating shaft with rotation, and the drive part which makes the said 1st rotating shaft drive-rotation and rotates the said barrel cam, Comprising: The said drive part is an energized state In this case, the restraint of the first rotary shaft is released to make the barrel cam and the rotary member rotatable, and the first rotary shaft is restrained when the drive unit is not energized. A cam device characterized in that a constraining portion which makes the barrel cam and the rotating member unrotatable is provided at a position different from the drive portion.

  According to such a cam device, it is possible to realize a barrel cam device in which overrun of the output table is suppressed at low cost.

  In the cam device, the drive unit is provided on one side in the axial direction of the first rotation shaft, and the restraint unit is provided on the other side in the axial direction of the first rotation shaft. Is desirable.

  According to such a cam device, it is possible to realize a cam device in which overrun of the output table is suppressed at lower cost.

=== About the cam device according to the present embodiment ===
The cam device according to the present embodiment is a roller gear cam device 1 using a roller gear cam 10. Below, this roller gear cam apparatus 1 is demonstrated using FIG. 1 thru | or FIG. FIG. 1 is a perspective view showing the appearance of the roller gear cam device 1. FIG. 2 is a perspective view showing the inside of the roller gear cam device 1. FIG. 3 is a perspective view showing the main part of the roller gear cam device 1 in cross section.

  In the drawings according to the present embodiment, the three directions orthogonal to one another are referred to as an X direction, a Y direction, and a Z direction, respectively, and the X direction and the Y direction are respectively directed in the horizontal direction. It is facing vertically. Then, with the direction along the axial direction of the input shaft 12 (corresponding to the first rotation shaft) taken as the X direction, the side provided with the restraint portion 40 (servo motor 30 (corresponding to the drive unit)) of the input shaft 12 is left It is called (right), and the side provided with the roller gear cam 10 (corresponding to the output table 20 (corresponding to a rotating member)) as the Y direction is called the near side (back).

  The roller gear cam device 1 transmits the rotation (rotational force) of the servomotor 30 input to the input shaft 12 of the roller gear cam 10 to the rotation (rotational force) of the table 23 of the output table 20 via the cam mechanism ( Output).

  The roller gear cam device 1 includes a roller gear cam 10 and an output table 20 inside the housing 2, and both ends of the input shaft 12 of the roller gear cam 10 serve as an input unit to the input shaft 12. The twenty tables 23 are exposed to the outside from the housing 2 as output parts. The servomotor 30 is provided at the input portion exposed on the right side of the housing 2, and the restraint portion 40 is provided at the input portion exposed on the left side of the housing 2. That is, the servomotor 30 is provided on one side in the axial direction of the input shaft 12, and the restraint portion 40 is provided on the other side in the axial direction of the input shaft 12.

  Inside the housing 2, both ends of the input shaft 12 of the roller gear cam 10 are rotatably supported by a pair of input shaft supports 13 fixed to the housing 2, and the input shaft 12 extends in the X direction. The direction can be rotated about the axis of rotation. Further, both end sides of the output shaft 22 (corresponding to the second rotation shaft) of the output table 20 are rotatably supported by a pair of output shaft supports (not shown) fixed to the housing 2. The direction along the direction can be rotated as a rotation axis.

  A spiral cam groove 11 is provided along the X direction (axial direction) at a central portion of the roller gear cam 10 (input shaft 12) in the X direction. A plurality of cam grooves 11 and a plurality of output tables 20 are provided. The cam follower 21 is engaged. The plurality of cam followers 21 are provided at equal intervals along the circumferential direction on the lower side of the outer peripheral surface of the output shaft 22 of the output table 20 (that is, the output shaft 22 radially includes a plurality of cam followers 21). ). Then, the table 23 is fixed to the output shaft 22 above the outer peripheral surface of the output shaft 22, and the table 23 rotates as the output shaft 22 rotates.

  That is, in FIGS. 1 to 3, when the roller gear cam 10 (input shaft 12) rotates clockwise as viewed from the right side in the X direction, each of the plurality of cam followers 21 engaged with the cam groove 11 It is guided by the spiral cam groove 11 and moves along the circumferential direction of the output shaft 22 from the right side to the left side in the X direction. That is, the output shaft 22 (table 23) rotates clockwise as viewed from the upper side in the Z direction. That is, as the roller gear cam 10 rotates, the output table 20 rotates.

  The servomotor 30 is a device for driving and rotating the input shaft 12 as a power source of the input shaft 12 and, with the roller gear cam 10 (input shaft 12), on the right side in the axial direction of the roller gear cam 10 (input shaft 12). Connected In the present embodiment, the drive shaft 31 is fastened by the coupling 32 so that the axial direction of the input shaft 12 and the axial direction of the drive shaft 31 of the servomotor 30 are along (the roller gear cam 10 and servo Motor 30 is directly connected). Therefore, when the drive shaft 31 of the servomotor 30 rotates, the input shaft 12 rotates, and the output shaft 22 (table 23) rotates via the cam groove 11 and the cam follower 21.

<<< Regarding the restraint unit 40 >>>
Next, the restraint unit 40 will be described with reference to FIGS. 1 to 4. The left view of FIG. 4 is a cross-sectional schematic view of the restraint portion 40 when the restraint portion 40 is not energized, and the right view of FIG. 4 is a cross-sectional schematic view of the restraint portion 40 when the restraint portion 40 is energized. . In the left and right views of FIG. 4, the vertical direction of the paper surface is the radial direction of the restraint portion 40, and the radial direction and the direction orthogonal to the paper surface are the X direction in FIGS.

  The restraint unit 40 is a device for suppressing an overrun of the output table 20 (table 23) around the output shaft 22 when the power supply of the servomotor 30 is suddenly deenergized due to a power failure or the like. As shown in FIGS. 1 to 3, the roller gear cam 10 (input shaft 12) is connected to the left side of the roller gear cam 10 (input shaft 12) in the X direction. That is, by restraining the roller gear cam 10 (input shaft 12) so as not to rotate, overrun of the output table 20 (table 23) is suppressed via the cam mechanism.

  Note that “overrun” is rotating because the torque transmitted from the servomotor 30 to the output table 20 suddenly becomes zero when the power supply of the servomotor 30 is suddenly deenergized due to a power failure or the like. Inertia force of the output table 20, for example, the self weight of a heavy load (tooling etc.) offset to the output table 20 (disposed radially outward with respect to the outer peripheral surface of the table 23), etc. That is, the output table 20 is rotated by the rotational force (not the rotational force from the servomotor 30), and the position of the output table 20 is deviated from the position which should be originally.

  The restraining portion 40 includes a stator 41, an armature 42, a rotor 43, and a plate 44 so that a substantially cylindrical stator 41 and a substantially disc-like plate 44 have a gap in the X direction. It is fixed. Specifically, a plurality of bolts 40 a are penetrated from the left side of the stator 41 to the right side of the plate 44 on the side near the outer peripheral surface of the stator 41 and the plate 44. A substantially cylindrical gap member 40c through which the respective bolt 40a penetrates is provided between (that is, a gap portion), and on the right side surface of the plate 44, screwing of each projecting bolt 40a and nut 40b is performed. By doing this, the stator 41 and the plate 44 are fixed so as to have a gap in the X direction.

  An armature 42 and a rotor 43 are provided in the gap, and the armature 42 is movable in the X direction of the gap. A coil 45 and a plurality of torque springs 46 are provided inside the stator 41.

  The coil 45 is a member that is excited by flowing a current to generate a magnetic force. That is, the coil 45 is connected to a power supply (not shown) of the coil 45 (restraint portion 40) by the power supply cord 45a, and the armature 42 is attracted to the coil 45 by the magnetic force generated when the power is turned on. Further, in the present embodiment, the power supply of the servomotor 30 and the power supply of the coil 45 are interlocked. That is, when the power supply of the servomotor 30 is off and the servomotor 30 is in the non-energized state, the power supply of the coil 45 (restraint portion 40) is also off and the coil 45 (restriction portion 40) is also deenergized. When the motor 30 is powered on and the servo motor 30 is energized, the coil 45 (restraint portion 40) is also powered on, and the coil 45 (restraint portion 40) is also energized.

  The coil 45 has a substantially cylindrical shape, and is provided inside the stator 41. The coil 45 is provided on the right side in the stator 41. This is because when the coil 45 is excited, the armature 42 can be attracted more magnetically by the closer the distance to the armature 42 is.

  The torque spring 46 is a member for always biasing the armature 42. The torque springs 46 are provided at equal intervals on the outer side in the radial direction of the coil 45 provided inside the stator 41, and provided so that a part of the torque spring 46 protrudes from the side surface of the stator 41. . That is, in FIG. 4, a part of the torque spring 46 is provided so as to project from the right side surface of the stator 41, and energy of the torque spring 46 is accumulated (that is, a state where the torque spring 46 is contracted). The protruding portion of the torque spring 46 is provided to be in contact with the armature 42. That is, in FIG. 4, the torque spring 46 always biases the armature 42 from the left side to the right side in the X direction by the stored energy (repulsive force).

  The rotor 43 is a member fixed to the input shaft 12 and rotating with the rotation of the input shaft 12, and is sandwiched between the armature 42 (left side) and the plate 44 (right side) in the X direction. The rotor 43 has a substantially cylindrical shape in which the length of the inner portion 43a is long in the X direction, and the length of the outer portion 43b is substantially in the shape of a short disk in the X direction. The inner portion 43a is fitted to the input shaft 12, and the rotor 43 and the input shaft 12 are fixed by bolts or the like (not shown). The outer diameter dimension of the outer portion 43b is such that it does not contact the gap member 40c near the outer peripheral surface when the rotor 43 rotates.

  The armature 42 is a metal piece moved by magnetic force when the coil 45 is excited, and is sandwiched between the stator 41 (left side) and the rotor 43 (right side) in the X direction. The armature 42 has a substantially disc shape, and is engaged with the inner portion 43 a of the rotor 43 so as to be movable in the X direction. The outer diameter size of the armature 42 is substantially the same as the outer diameter size of the stator 41 and is in constant contact with the plurality of torque springs 46.

  Next, the change in the state of the restraint unit 40 due to the difference in the energization state of the servomotor 30 will be described. In the present embodiment, as described above, the power supply of the servomotor 30 and the power supply of the restraint unit 40 interlock. And the restraint part 40 at the time of servomotor 30 deenergization corresponds to the left figure of FIG. 4, and the restraint part 40 at the time of servomotor 30 energization corresponds to the right figure of FIG.

  In the left view of FIG. 4 where the power supply of the restraint unit 40 (servo motor 30) is OFF, the coil 45 is not excited, so the armature 42 is not attracted to the coil 45 side. It is pressed against the rotor 43 by the repulsive force (as a result, there is a gap between the armature 42 and the coil 45). The armature 42 is in contact with the left side surface of the rotor 43 and presses the rotor 43 against the plate 44. That is, the armature 42 sandwiches and holds the rotor 43 with the plate 44 by the repulsive force of the torque spring 46. Therefore, a frictional force is generated on the contact surface between the rotor 43 and the armature 42 and the plate 44. The frictional force makes the rotor 43 non-rotatable, and the input shaft 12 (roller gear cam 10) fixed to the rotor 43 Also can not rotate. That is, when the restraint unit 40 is in the non-energized state, the roller gear cam 10 can not rotate, and the output table 20 that rotates via the roller gear cam 10 and the cam mechanism can not rotate.

  In the right view of FIG. 4 which shows the state where the power supply of the restraint part 40 (servo motor 30) is ON, since the coil 45 is excited, the armature 42 is attracted to the coil 45 side and the armature 42 and the coil 45 are (Ie, the coil 45 at the time of excitation has a suction force stronger than the repulsive force of the torque spring 46). Therefore, an air gap is generated between the rotor 43 and the armature 42 and the plate 44. That is, as shown in the left view of FIG. 4, since the rotor 43 contacts the armature 42 and the plate 44 and no frictional force is generated, the input shaft 12 (roller gear cam 10) fixed to the rotor 43 rotates. It is possible. That is, when the restraint unit 40 is in the energized state, the roller gear cam 10 can rotate, and the output table 20 that rotates via the roller gear cam 10 and the cam mechanism can also rotate.

  That is, in the present embodiment, when the servomotor 30 is in the energized state, the restraint of the input shaft 12 is released to make the roller gear cam 10 and the output table 20 rotatable, and the servomotor 30 is not energized. In the state, a constraining portion 40 which restrains the input shaft 12 to make the roller gear cam 10 and the output table 20 non-rotatable is provided at a position different from that of the servomotor 30.

=== Regarding the cam device according to the second embodiment ===
In the above embodiment (first embodiment), the roller gear cam device 1 using the roller gear cam 10 as the cam device has been described by way of an example including the restraint portion 40, but the invention is not limited thereto. . For example, the barrel cam device 100 using the barrel cam 110 as the cam device may be provided with the restraint portion 40. Hereinafter, as a second embodiment, an example in which the barrel cam device 100 includes the restraint portion 40 will be described with reference to FIGS. 5 to 7.

  FIG. 5 is a perspective view showing the appearance of the barrel cam device 100. As shown in FIG. FIG. 6 is a perspective view showing the inside of the barrel cam device 100. As shown in FIG. FIG. 7 is a view showing a state in which the cam groove 111 and the cam follower 121 of the barrel cam device 100 are engaged.

  The barrel cam device 100 outputs the rotation (rotational force) of a servomotor 130 (corresponding to a drive unit) input to the input shaft 112 (corresponding to a first rotation shaft) of the barrel cam 110 through an output table 120 (rotary member) And the rotation (rotational force) of the table 123).

  The barrel cam device 100 is provided with a barrel cam 110 and an output table 120 inside the housing 102, and both ends of the input shaft 112 of the barrel cam 110 are input to the input shaft 112, and the table 123 of the output table 120 is output As a part, each is exposed from the housing 102 to the outside. The servomotor 130 is provided at the input portion exposed on the right side of the housing 102, and the restraint portion 40 is provided at the input portion exposed on the left side of the housing 102. That is, the servomotor 130 is provided on one side of the input shaft 112 in the axial direction, and the restraint portion 40 is provided on the other side of the input shaft 112 in the axial direction.

  Inside the housing 102, both ends of the input shaft 112 of the barrel cam 110 are rotatably supported by a pair of input shaft supports 113 fixed to the housing 102, and the input shaft 112 has a direction along the X direction. The both ends of the output shaft 122 (corresponding to the second rotation shaft) of the output table 120 can be rotated as a rotation shaft, and rotatably supported by a pair of output shaft supports (not shown) fixed to the housing 102 The output shaft 122 can rotate with a direction along the Z direction as a rotation axis.

  A spiral cam groove 111 is provided along the X direction (axial direction) at the center of the barrel cam 110 (input shaft 112) in the X direction. The cam groove 111 and a plurality of cam followers 121 of the output table 120 are provided. And are engaged. The plurality of cam followers 121 are provided at equal intervals along the circumferential direction on the lower surface of the output shaft 122 of the output table 120 (that is, the rotational direction of the cam follower 121 is parallel to the rotational axis of the output shaft 122 Are equally spaced along the circumferential direction). Then, the table 123 is fixed to the output shaft 122 on the upper side of the outer peripheral surface of the output shaft 122, and the table 123 rotates with the rotation of the output shaft 122.

  That is, in FIGS. 5 to 7, when the barrel cam 110 (input shaft 112) rotates clockwise as viewed from the right side in the X direction, each of the plurality of cam followers 121 engaged with the cam groove 111 has a spiral shape. , And move along the circumferential direction of the output shaft 122 from the right side to the left side in the X direction. That is, the output shaft 122 (table 123) rotates clockwise as viewed from the upper side in the Z direction. That is, as the barrel cam 110 rotates, the output table 120 rotates.

  The servomotor 130 is a device for driving and rotating the input shaft 112 as a power source of the input shaft 112, and is connected to the barrel cam 110 (input shaft 112) on the right side in the axial direction of the barrel cam 110 (input shaft 112). . In the second embodiment, the drive shaft 131 is fastened by the coupling 132 so that the axial direction of the input shaft 112 and the axial direction of the drive shaft 131 of the servo motor 130 are in line (barrel cam 110 and servo motor 130 are directly connected). Therefore, when the drive shaft 131 of the servomotor 130 rotates, the input shaft 112 rotates, and the output shaft 122 (table 123) rotates via the cam groove 111 and the cam follower 121.

  The restraint unit 40 according to the second embodiment is the same as the restraint unit 40 according to the first embodiment in the configuration, operation, and effects of the restraint unit 40. Therefore, the detailed description is omitted.

  That is, in the restraint unit 40 according to the second embodiment, when the servo motor 130 is in the non-energized state, the output table 120 can be made non-rotatable by making the input shaft 112 (barrel cam 110) fixed to the rotor 43 unrotatable. The output table 120 is made rotatable by making the input shaft 112 (barrel cam 110) fixed to the rotor 43 rotatable when the servomotor 130 is in a non-rotatable state.

  That is, in the present embodiment, when the servomotor 130 is in the energized state, the restraint of the input shaft 112 is released to make the barrel cam 110 and the output table 120 rotatable, and the servomotor 130 is not energized. In this case, a restraining portion 40 is provided at a position different from that of the servomotor 130. The restraining portion 40 restraining the input shaft 112 to make the barrel cam 110 and the output table 120 non-rotatable.

=== Regarding the effectiveness of the cam device according to the first and second embodiments ===
As described above, the cam device according to the first embodiment includes the input shaft 12 and the cam groove 11, and includes the roller gear cam 10 rotatable around the input shaft 12, the output shaft 22, and the plurality of cam followers 21. By engaging the cam groove 11 with the cam follower 21, the output table 20 rotates around the output shaft 22 with the rotation of the roller gear cam 10, and the servo rotates the roller gear cam 10 by driving the input shaft 12 to rotate. A cam device including the motor 30, and when the servo motor 30 is in the energized state, the restraint of the input shaft 12 is released to make the roller gear cam 10 and the output table 20 rotatable; When the motor is in the non-energized state, the servomotor 30 is configured to restrain the input shaft 12 and make the roller gear cam 10 and the output table 20 non-rotatable. Was that is provided in the different positions. Therefore, it is possible to realize a roller gear cam device in which overrun of the output table 20 is suppressed at low cost.

  The cam device according to the second embodiment includes an input shaft 112 and a cam groove 111, and includes a barrel cam 110 rotatable around the input shaft 112, an output shaft 122, and a plurality of cam followers 121. Cam device comprising: an output table 120 which rotates around the output shaft 122 with the rotation of the barrel cam 110 by engagement of the cam follower 121; and a servomotor 130 which rotates the barrel cam 110 by driving the input shaft 112. When the servomotor 130 is in the energized state, the input shaft 112 is released from the restraint to make the barrel cam 110 and the output table 120 rotatable, and when the servomotor 130 is in the non-energized state, A restraining portion 40 which restrains the shaft 112 to make the barrel cam 110 and the output table 120 non-rotatable is a servomotor Was that provided in a position different from the 30. Therefore, it is possible to realize a barrel cam device in which overrun of the output table 120 is suppressed at low cost.

  Conventionally, when the power supply of the servomotor 30 (servomotor 130) is suddenly de-energized due to a power failure or the like, the drive shaft 31 (driveshaft 131) of the servomotor 30 (servomotor 130) is The rotation is restricted so that the output table 20 (output table 120) does not overrun around the output shaft 22 (output shaft 122).

  However, in the method of restraining the drive shaft 31 (drive shaft 131) of the servomotor 30 (servo motor 130) in a non-rotatable manner, generally, the drive shaft 31 (drive shaft 131) of the servomotor 30 (servo motor 130) and the input Since the shaft 12 (input shaft 112) is coupled by means of a reduction gear, etc., the output table 20 (output table) of the reduction gear or the coupling engagement looseness (gear backlash or clearance of the fastening portion etc.) An overrun of 120) occurred.

  Therefore, when the overrun due to this play becomes a problem, conventionally, the output table 20 (output table 120) is directly restricted by the restraint device so as not to be rotatable. Overruns were suppressed. However, according to such a method, as the size of the output table 20 (the output table 120) increases, the size of the restraining device for restraining also needs to be increased (restriction of the restraining force), so the cost increases and the restraining device becomes complicated. There was a problem that.

  On the other hand, in the present invention, when the servomotor 30 (servomotor 130) is in the energized state, the restraint of the input shaft 12 (input shaft 112) is released and the roller gear cam 10 (barrel cam 110) and the output table 20 (output table 120) is made rotatable, and when the servomotor 30 (servomotor 130) is not energized, the input shaft 12 (input shaft 112) is restrained and the roller gear cam 10 (barrel cam 110) In addition, the restraint unit 40 that makes the output table 20 (output table 120) unrotatable is provided at a position different from that of the servo motor 30 (servo motor 130).

  That is, the cam mechanism of the roller gear cam 10 (barrel cam 110) (the engagement between the cam groove 11 (cam groove 111) and the cam follower 21 (cam follower 121)) does not have a large play such as a reduction gear or coupling engagement. Therefore, according to the method of restraining the input shaft 12 (the input shaft 112), the output table 20 (the output shaft 20 (the output of the cam mechanism) has a smaller amount of play than the method of restraining the drive shaft 31 (the drive shaft 131). It is possible to suppress the overrun of the table 120).

  Furthermore, the output table 20 (output table 120) can not be rotated directly, but the output table 20 (output table 120) can not be rotated via the cam mechanism (that is, the input shaft 12 (input By constraining the shaft 112) and making it impossible to rotate, the constraining portion 40 can be made to have a simple structure, and cost reduction and downsizing of the constraining portion 40 can be realized. That is, it is possible to realize the roller gear cam device 1 (barrel cam device 100) in which overrun of the output table 20 (output table 120) is suppressed at low cost.

  In the first embodiment (second embodiment), the servomotor 30 (servomotor 130) is provided on one side in the axial direction of the input shaft 12 (input shaft 112), and the input shaft 12 (input shaft) The restraint portion 40 is provided on the other side in the axial direction of 112).

  Therefore, it is possible to use a restraint unit 40 that is generally available and readily available, that is, a so-called commercially available restraint unit 40, and cost can be suppressed compared to the case where a custom-made restraint unit 40 is used. Become. That is, it is possible to realize the roller gear cam device 1 (barrel cam device 100) in which the overrun of the output table 20 (output table 120) is suppressed at a lower cost.

=== Other Embodiments ===
As mentioned above, although the cam apparatus which concerns on this invention based on the said embodiment was demonstrated, the embodiment of the invention mentioned above is for making an understanding of this invention easy, and this invention is the said embodiment. It is not limited. The present invention can be modified and improved without departing from the gist thereof, and the present invention naturally includes the equivalents thereof.

  Moreover, in the said embodiment, although the roller gear cam 10 (barrel cam 110) and the servomotor 30 (servomotor 130) were directly connected, it does not restrict to this. For example, they may be connected indirectly via a reduction gear. When the drive shaft 31 (drive shaft 131) is connected indirectly via the reduction gear and locked by the servo lock function, the overrun of the output table 20 (output table 120) is equal to the backlash of the reduction gear. Because it occurs, the present invention works more effectively.

  Moreover, although the restraint part 40 of what is called a commercial item was used in the said embodiment, a non-excitation action | operation type | mold brake (Miki pulley Co., Ltd.) can be mentioned as this specific example. However, it is not limited to this.

Reference Signs List 1 roller gear cam device, 2 housing, 10 roller gear cam, 11 cam groove 12 input shaft, 13 input shaft support, 20 output table, 21 cam follower 22 output shaft, 23 table, 30 servo motor, 31 drive shaft 32 coupling, 40 restraint part, 40a bolt, 40b nut 40c clearance member, 41 stator, 42 armature, 43 rotor 43a rotor inner part, 43b rotor outer part, 44 plate 45 coil 45a power cord, 46 torque spring 100 barrel cam device 102 Housing, 110 roller gear cam 111 cam groove, 112 input shaft, 113 input shaft support, 120 output table 121 cam follower, 122 output shaft, 123 table, 130 servo motor 131 drive shaft, 132 coupling

Claims (3)

A roller gear cam having a first rotation axis and a cam groove, the roller gear cam being rotatable about the first rotation axis;
A rotating member that includes a second rotating shaft and a plurality of cam followers, and the cam groove and the cam follower engage to rotate around the second rotating shaft as the roller gear cam rotates;
A driving unit that drives and rotates the first rotation shaft to rotate the roller gear cam;
A cam device comprising
When the drive unit is in an energized state, the restriction of the first rotation shaft is released to make the roller gear cam and the rotation member rotatable.
When the drive unit is in a non-energized state, a restraint unit that restrains the first rotation shaft to make the roller gear cam and the rotation member non-rotatable is provided at a position different from the drive unit. Cam device characterized by A barrel cam having a first rotation axis and a cam groove, the barrel cam being rotatable about the first rotation axis;
A rotating member that includes a second rotation shaft and a plurality of cam followers, and the cam groove and the cam follower are engaged to rotate around the second rotation shaft as the barrel cam rotates;
A driving unit for driving and rotating the first rotation shaft to rotate the barrel cam;
A cam device comprising
When the drive unit is in an energized state, the restraint of the first rotation shaft is released to make the barrel cam and the rotation member rotatable.
When the drive unit is in the non-energized state, a restraint unit that restrains the first rotation shaft to make the barrel cam and the rotation member non-rotatable is provided at a position different from the drive unit. Features a cam device. The cam device according to claim 1 or 2, wherein
The drive unit is provided on one side in the axial direction of the first rotation shaft,
The cam device characterized in that the restraint portion is provided on the other side of the first rotation shaft in the axial direction.