Abstract
The present invention provides an indexing driving device for a turntable, which is provided with a plurality of roller followers arranged at equal angular intervals; and a barrel component, which is provided on one side of the turntable, the cam component is provided with a first side rib wall with a continuous cam curved surface in a first direction and a second side rib wall with a continuous cam curved surface in a second direction, and the first side rib wall and the second side rib wall are facing opposite sides to form a cam groove with variable groove width, for introducing the roller followers and rotating the turntable; wherein the cam groove with variable groove width makes the first side rib wall and the second side rib wall respectively pre-compress to at least one pair of the roller followers of the turntable symmetrically in different directions, so as to effectively eliminate the backlash problem between the cam component and the roller followers and improve the positioning accuracy of the turntable.
Claims
1. An indexing driving device of turntable, which includes: a machine base; a turntable, which is provided on the machine base, and the turntable is having-a plurality of roller followers arranged at equal angular intervals; a cam component, which is provided on one side of the turntable, the cam component is provided with a first side rib wall with a continuous cam curved surface in a first direction and a second side rib wall with a continuous cam curved surface in a second direction, and the first side rib wall and the second side rib wall are facing opposite sides to form a cam groove with variable groove width, for introducing the roller followers and rotating the turntable; wherein the cam groove with variable groove width makes the first side rib wall and the second side rib wall respectively pre-compress to at least one pair of the roller followers of the turntable symmetrically in different directions.
2. The indexing drive device of turntable according of claim 1, wherein the turntable is provided with a plurality of roller followers on the turntable surface, and the central axis of the plurality of roller followers are parallel to the central axis of the turntable, and the cam component is barrel cam.
3. The indexing drive device of turntable according of claim 1, wherein the cam component is having a cam axle, one end of the cam axle is connected to a driving source to drive the cam component to rotate.
4. The indexing drive device of turntable according of claim 3, wherein the driving source of the cam component is connected to a reducer, the reducer is driving connected to the cam axle of the cam component.
5. The indexing drive device of turntable according of claim 1, wherein the cam component is provided with a first side rib wall with a continuous cam curved surface in a first direction formed by machining, and a second side rib wall with a continuous cam curved surface in a second direction formed by machining.
6. The indexing drive device of turntable according of claim 1, a leading end of the first side rib wall of the cam component extends with a progressive guiding cam curved surface for progressively leading or introducing the rollers followers.
7. The indexing drive device of turntable according of claim 1, a leading end of the second side rib wall of the cam component extends with a progressive guiding cam curved surface for progressively leading or introducing the rollers followers.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1: Schematic diagram of the driving mode of conventional roller gear cam.
[0014] FIG. 2: Schematic diagram of the driving mode of conventional barrel cam.
[0015] FIG. 3: Figure shows the relative positional relationship diagram of the left and right rib walls of each roller followers, when the barrel cam of FIG. 2 is rotated counterclockwise.
[0016] FIG. 4: Shows the relative positional relationship diagram of the left and right rib walls of each roller followers, when the barrel cam of FIG. 2 is rotated clockwise
[0017] The relative positional relationship diagram of the left and right rib walls of the wheel.
[0018] FIG. 5: Schematic diagram of the structure of the present invention.
[0019] FIG. 6: Schematic diagram of the cam component in the present invention.
[0020] FIG. 7: Schematic view showing the roller follower is placed in the cam complement of the present invention.
[0021] FIG. 8: Schematic diagram shows the relative positional relationship between each of the roller follower and the first and second side rib walls of the cam component in FIG. 7.
[0022] FIG. 9: Schematic diagram shows the counterclockwise rotation of the cam component of the present invention.
[0023] FIG. 10: Schematic diagram shows the cam component of the present invention rotated 360 degrees counterclockwise.
[0024] FIG. 11: Schematic diagram shows the relative positional relationship between each of the roller follower and the first and second side rib walls of the cam component in FIG. 10.
[0025] FIG. 12: Schematic diagram shows the clockwise rotation of the cam member of the present invention.
[0026] FIG. 13: Schematic diagram shows the cam member of the present invention rotated 360 degrees clockwise.
[0027] FIG. 14: Schematic diagram shows the relative positional relationship between each of the roller follower and the first and second side rib walls of the cam component in FIG. 13.
DETAILED DESCRIPTION OF THE INVENTION
[0028] In order to let the reviewer further understand the present invention, the preferred embodiment will be described in detail as the following description:
[0029] Please refer to FIG. 5, the driving mode of present invention can be roller gear cam and barrel cam; in one of the embodiments of the present invention, the barrel cam is used as driving mode for description; in the driving mode of barrel cam, the turntable 31 is provided on a machine base 30, the turntable 31 is freely rotatable on the machine base 30, the turntable 31 is having a plurality of roller followers 32 arranged at equal angular intervals.
[0030] In one of the embodiments of the present invention, the turntable 31 is having 20 roller followers 32 arranged at equal angular intervals. The central axis of the plurality of roller followers are parallel to the central axis of the turntable, and the cam component is barrel cam. A barrel component 40 is provided on one side of the turntable 31. In one of the embodiments of the present invention, the cam component 40 is barrel cam, wherein the cam component 40 is having a cam axle 41, one end of the cam axle 41 is connected to a driving source 50 to drive the cam component 40 to rotate. The driving source 50 of the cam component 40 is connected to a reducer 51, the reducer is driving connected to the cam axle 41 of the can component 40.
[0031] Please refer to FIG. 6, the cam component 40 is provided with a first side rib wall 42 with a continuous cam curved surface in a first direction and a second side rib wall 43 with a continuous cam curved surface in a second direction, and the first side rib wall 42 and the second side rib wall 43 are facing opposite sides to form a cam groove with variable groove width, for introducing the roller followers 32 and rotating the turntable 31; Besides, the leading end of the first side rib wall 42 and the second side rib wall 43 of the cam component extends with a progressive guiding can curved surface 421, 431 for progressively leading or introducing the rollers followers 32 smoothly. In one of the embodiments of the present invention, the cam component 40 is designed according to various conditions, and the can component 40 is provided with a first side rib wall 42 with a continuous cam curved surface in a first direction (from right to left) formed by machining, and the cam component 40 is provided with a second side rib wall 43 with a continuous cam curved surface in a second direction (from left to right) formed by machining to form a cam groove with variable groove width. That is, the conventional technology first constructs the can groove, and the first side rib wall and the second side rib wall are naturally formed on the two sides of the cam groove, so that the equal groove width of can groove is obtained. However, the invention firstly constructs a continuous cam curved surface of the first side rib wall 42 and the second side rib wall 43, so that the cam groove with variable groove width can be obtained between the first side rib wall 42 and the second side rib wall 43.
[0032] Please refer to FIG. 7, when the cam groove 44 of the cam component 40 of the present invention is placed in the roller follower of the turntable 31, since the cam groove 44 is designed to be variable groove width, the cam groove with variable groove width makes the first side rib wall 42 and the second side rib wall 43 respectively pre-stress on at least one pair of the roller followers of the turntable 31 symmetrically in different directions. In one embodiment of the present invention, the first side rib wall 42 and the second side rib wall 43 are pre-compressed by the first and second directions respectively, the first pair of roller followers 32b, 32o and the second pair of roller followers 32d, 32e. The center position of roller follower 32a maintains a gap with the first side rib wall 42 and the second side rib wall 43 without contact. Please refer to FIG. 8 for the relative positional relationship between each of the roller followers 32a, 32b, 32c, 32d, and 32e and the first side rib wall 42 and the second side rib wall 43. The A1 section represents the pre-compression zone of the first side rib wall 42, the A2 section represents the pre-compression import and export area of the first side rib wall 42, and the B1 section represents the pre-compression zone of the second side rib wall 43. The B2 section indicates the pre-compression import and export area of the second side rib wall 43, and the C section indicates the pre-compression reversing area.
[0033] In the present invention, since the cam groove 44 has a design of variable groove width, it can be found from the relative positional relationship diagram that the roller follower 32a located in the pre-compression reversing zone of the C section does not contact the first side rib wall 42 and the second side rib wall 43. The first pair of roller followers 32b and the second pair of roller followers 32d are located in the pre-compression zone of the first side rib wall 42 in the A1 section, and the gap between the first side rib wall 42 is 0 mm; that is, the first pair of roller followers 32b and the second pair of roller followers 32d are in contact with the first side rib wall 42, and are pre-compressed by the first side rib wall 42. As for the first pair of roller followers 320 and the second pair of roller followers 32e are fall in the pre-compression zone of the second side rib wall 43 of the B1 section, and the gap between the second side rib walls 43 is 0 mm; that is, the first pair of roller followers 32c and the second pair of roller followers 32e are in contact with the second side rib wall 43 and are pre-compressed by the second side rib wall 43, so that the first side rib wall 42 and the second side rib wall 43 can be symmetrically pre-compressed from different directions respectively with the first pair of roller followers 32b, 320 and the second pair of roller followers 32d, 32e.
[0034] Please refer to FIG. 9, when the cam component 40 is rotated counterclockwise (CCW), the second side rib wall 43 pre-compresses to the first pair of roller followers 32o and the second pair of roller followers 32e. Therefore, the second side rib wall 43 of the cam component 40 can be used to immediately move the first pair of roller followers 32c and the second pair of roller followers 32e to drive the turntable 31 clockwise (CW) to rotate, and effectively avoid the impact between the can component 40 and each of the roller followers, thereby effectively reducing the noise and vibration of the transmission. Please refer to FIGS. 10 and 11, after the cam component 40 is rotated 360 degrees counterclockwise (CCW), the guiding cam curved surface 431 of the leading end of the second side rib wall 43 of the cam component 40 can be gradually derived from the pre-compression import and export area of the second side rib wall 43 of the B2 section, so that the pre-compression zone of the second side rib wall 43 of the B1 section is changed to pre-compresses on the roller followers 320, 32a. Meanwhile, the rotation of the turntable 31 is also synchronized with the roller follower 32b to the pre-compression reversing zone of the C section without contacting the first side rib wall 42 and the second side rib wall 43, and the roller follower 32d is maintained in the first side rib of the A1 section. The pre-compression zone of the first side rib wall 42 and the guiding cam surface 421 of the leading end of the first side rib wall 42 are progressively introduced into the roller follower 32f from the pre-compression import and export area of the first side rib wall 42 of the A2 section, and the roller follower 32f enters the pre-compression zone of the first side rib wall 42 of the A1 section, and is in contact with the first side rib wall 42. The first side rib wall 42 and the second side rib wall 43 can be symmetrically pre-compressed from different directions respectively with the first pair of roller followers 32d, 32a and the second pair of roller followers 32f, 32c. Therefore, when the cam member 40 stops rotating, the roller followers 32d, 32f also simultaneously causes the turntable 31 to stop rotating immediately, so that the turntable 31 is accurately positioned at the preset indexing position.
[0035] Please refer to FIG. 12, which is continued from the state of FIG. 10, when the cam component 40 is rotated clockwise (CW), the first side rib wall 42 pre-compresses to the first pair of roller followers 32d and the second pair of roller followers 32f. Therefore, the first side rib wall 42 of the cam component 40 can be used to immediately move the first pair of roller followers 32d and the second pair of roller followers 32f to drive the turntable 31 counterclockwise (CCW) to rotate, and effectively avoid the impact between the cam component 40 and each of the roller followers, thereby effectively reducing the noise and vibration of the transmission. Please refer to FIGS. 13 and 14, after the cam component 40 is rotated 360 degrees clockwise (CCW), the guiding cam curved surface 421 of the leading end of the first side rib wall 42 of the cam component 40 can be gradually derived from the pre-compression import and export area of the first side rib wall 42 of the A2 section, so that the pre-compression zone of the first side rib wall 42 of the A1 section is changed to pre-compress on the roller followers 32b, 32d. Meanwhile, the rotation of the turntable 31 is also synchronized with the roller follower 32c to the pre-compression reversing zone of the C section without contacting the first side rib wall 42 and the second side rib wall 43, and the roller follower 32c is maintained in the second side rib of the B1 section. The pre-compression zone of the second side rib wall 43 and the guiding cam surface 431 of the leading end of the second side rib wall 43 are progressively introduced into the roller follower 32e from the pre-compression import and export area of the second side rib wall 43 of the B2 section, and the roller follower 32e enters the pre-compression zone of the second side rib wall 43 of the B1 section, and is in contact with the second side rib wall 43. The first side rib wall 42 and the second side rib wall 43 can be symmetrically pre-compressed from different directions respectively with the first pair of roller followers 32b, 32c and the second pair of roller followers 32d, 32e. Therefore, when the cam member 40 stops rotating, the roller followers 32c, 32e also simultaneously causes the turntable 31 to stop rotating immediately, so that the turntable 31 is accurately positioned at the preset indexing position.
[0036] According to the above description, the can component provides the design of the cam groove with variable groove width. Therefore, the cam component can pre-compress to at least one pair of roller followers on the first side rib wall with a continuous cam curved surface in a first direction and on the second side rib wall with a continuous cam curved surface in a second direction, so as to keep the zero backlash state between the first side rib wall, the second side rib wall and at least one pair of roller followers. The cam component can be positively or reversely started or stopped at any angular position without causing impact vibration between the rib wall and the roller followers, which not only makes the turntable accurately located at the preset indexing position and ensures the machining accuracy of the workpiece on the turntable.
[0037] Accordingly, the present invention is a practical and progressive design, but it has not been disclosed that the same products and publications are disclosed, thereby permitting the invention patent application requirements, and applying in accordance with the law.
[0038] Although the present invention has been described in terms of specific exemplary embodiments and examples, it will be appreciated that the embodiments disclosed herein are for illustrative purposes only and various modifications and alterations might be made by those skilled in the art without departing from the spirit and scope of the invention as set forth in the following claims.
SYMBOLS
[0039] The Prior Art: [0040] 10 roller follower [0041] 11 turntable [0042] 12 roller gear cam [0043] 121 roller gear cam [0044] 20 roller follower [0045] 21 turntable [0046] 22 barrel cam [0047] 221 cam groove [0048] 222 left rib wall [0049] 223 right rib wall
[0050] The present invention: [0051] 30 machine base [0052] 31 turntable [0053] 32 roller follower [0054] 32a roller follower [0055] 32b roller follower [0056] 32o roller follower [0057] 32d roller follower [0058] 32e roller follower [0059] 32f roller follower [0060] 40 can component [0061] 41 cam axle [0062] 42 first side rib wall [0063] 421 guiding cam curved surface [0064] 43 second side rib wall [0065] 431 guiding cam surface [0066] 44 cam groove [0067] 50 driving source [0068] 51 reducer [0069] A1 section: pre-compression zone of the first side rib wall [0070] A2 section: pre-compression import and export area of the first side rib wall [0071] B1 section: pre-compression zone of the second side rib wall [0072] B2 section: pre-compression import and export area of the second side rib wall [0073] C section: pre-compression reversing area
