Internal drive indexer

Abstract

An internally driven indexer includes an indexer unit body. The indexer unit body includes a first fixed seat and a second fixed seat that are spaced apart and stationary, and an output shaft ring. The inner side of the output shaft ring is provided with a first indexing structure and a second indexing structure that are staggered and misaligned. There is also a drive shaft that can be controlled and rotatably located in the output shaft ring. The drive shaft realizes the purpose of pushing the output shaft ring to rotate relative to the fixed seat by guiding and pushing the rollers in the first indexing structure and the second indexing structure. Since the rollers and the drive shaft are located in the surrounding space of the output shaft, the volume of the entire indexer unit body is reduced, making it flexible and applicable.

Description

Technical Field

[0001] The present invention relates to a transmission mechanism in a rotary device; in particular, it refers to an internally driven indexer suitable for a high-precision rotary device. Background Art

[0002] A known transmission mechanism for driving the rotation of a specific component of a machine tool includes a cam divider. The aforementioned cam divider has a heavy-load characteristic and mainly includes a motor, an input shaft, a cam, and a turret. The motor drives the input shaft to rotate, and the rotating input shaft drives the cam to push a roller arranged on the periphery of the turret with its curved surface, thereby causing the turret to rotate. The turret is connected to a specific component of the machine tool. The aforementioned specific component can be, for example, a tool disc in a disc-type tool magazine. A plurality of tool holders are arranged along the periphery of the tool disc. By driving the turret to rotate, the rotation of the tool disc can be controlled to change the position of the tool holders, thereby achieving the purpose of tool change.

[0003] The above-mentioned cam divider can be seen in the utility model patent case with the Taiwan, China patent publication No. M477341, titled "Improvement of Indexing Device and Its Cam Transmission Shaft", or the utility model patent with the China patent publication No. CN210790183, titled "An Output Component in a Cam Divider". However, in the way of these patented technologies that disclose arranging rollers on the outer periphery of the turret and using the combination of the input shaft and the cam to push the rollers, since the input shaft and the cam are located outside the turret, it obviously occupies a lot of space, making it difficult to reduce the overall volume of the machine tool applying the cam divider. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an internally driven indexer that can reduce the volume and make the application more flexible.

[0005] To achieve the above object, the present invention provides an internally driven indexing device comprising an indexing device unit body, which includes a first fixed seat and a second fixed seat that are spaced apart and fixed, as well as an output shaft collar, a first indexing structure, a second indexing structure, and a drive shaft. Among them, the output shaft collar is disposed between the first fixed seat and the second fixed seat, and the output shaft collar can rotate relative to the first fixed seat and the second fixed seat. The inner ring surface of the output shaft collar is divided into an upper ring surface and a lower ring surface; the first indexing structure includes a plurality of first indexing members, and these first indexing members are arranged along the upper ring surface and connected to the output shaft collar; the second indexing structure includes a plurality of second indexing members, and these second indexing members are arranged along the lower ring surface and connected to the output shaft collar, and these second indexing members and these first indexing members are arranged in a staggered manner; the drive shaft is rotatably located in the output shaft collar under control, and a first cam and a second cam are provided on the shaft body of the drive shaft. Among them, the rotating drive shaft pushes the first indexing member with the first cam and pushes the second indexing member with the second cam.

[0006] The effect of the present invention is that the indexing members are connected to the inner side of the output shaft collar, and the drive shaft is disposed in the surrounding space of the output shaft collar, so as to achieve the purpose of reducing the volume by effectively using the space. Brief Description of the Drawings

[0007] Figure 1 is a perspective view of the internally driven indexing device according to a preferred embodiment of the present invention;

[0008] Figure 2 is Figure 1 a side view of

[0009] Figure 3 is Figure 1 an exploded view of the internally driven indexing device shown;

[0010] Figure 4 is Figure 3 another perspective view of

[0011] Figure 5 is Figure 1 a perspective view of the rotating unit of the indexing device unit body in the internally driven indexing device shown;

[0012] Figure 6 is Figure 5 an exploded view of the rotating unit shown;

[0013] Figure 7 is Figure 6 a perspective view of some components of the rotating unit shown;

[0014] Figure 8 is Figure 5 a front view of the rotating unit shown;

[0015] Figure 9 is the sectional view in the 9-9 direction of Figure 8 ;

[0016] Figure 10 is the solid view of the stationary unit of the indexing unit body in the Figure 1 shown internal drive type indexing device;

[0017] Figure 11 is the exploded view of the stationary unit shown in Figure 10 ;

[0018] Figure 12 is the solid view of the drive shaft in the structure shown in Figure 11 ;

[0019] Figure 13 is the side view of the stationary unit shown in Figure 10 ;

[0020] Figure 14 is the sectional view in the 14-14 direction of Figure 2 ;

[0021] Figure 15 is the sectional view in the 15-15 direction of Figure 2 ;

[0022] Figure 16 is the solid view of the drive shaft in another embodiment of the present invention; and

[0023] Figure 17 is the top view of Figure 16 ;

[0024]

Symbol Explanation

[0025] 100: Indexing unit body

[0026] 101: Coupling seat

[0027] 10: Rotating unit

[0028] 11: Output shaft collar

[0029] 11A: Upper ring surface

[0030] 11B: Lower ring surface

[0031] 111: Coupling ring

[0032] 111a: Mounting hole

[0033] 112: Ridge

[0034] 112a: First surface

[0035] 112b: Second surface

[0036] 112c: Shaft hole

[0037] 113: Screw hole

[0038] 12: First indexing structure

[0039] 12a: Roller

[0040] 12b: Shaft

[0041] 12c: Bolt

[0042] 13: Second indexing structure

[0043] 13a: Roller

[0044] 13b: Shaft

[0045] 13c: Bolt

[0046] 14: First fixing ring

[0047] 14a: First engaging groove

[0048] 15: Second fixing ring

[0049] 15a: Second engaging groove

[0050] 16: First oil seal

[0051] 17: Second oil seal

[0052] 18: Bolt

[0053] 20: Stationary unit

[0054] 21: First fixing seat

[0055] 22: Second fixing seat

[0056] 22a: Second perforation

[0057] 23: Connecting seat

[0058] 231: Disc body

[0059] 231a: Convex ridge

[0060] 231b: First perforation

[0061] 232: Cylinder

[0062] 232a: Avoidance concave surface

[0063] 24: First bearing

[0064] 25: Second bearing

[0065] 26: Roller bearing

[0066] 27: Bolt

[0067] 28: Bolt

[0068] 30: Drive shaft

[0069] 31: Shaft body

[0070] 32: First cam

[0071] 33: Second cam

[0072] 40: Drive shaft

[0073] 41: Shaft body

[0074] 42: First cam

[0075] 43: Second cam

[0076] 200: Inductive connector

[0077] 201: Shaft adapter

[0078] 202: Inductive block

[0079] 202a: Arc segment

[0080] 203: Inductor

[0081] 300: Motor

[0082] 301: Input shaft

[0083] C: Base circle center

[0084] L: Axis Detailed implementation manner

[0085] The internal drive type indexer of the present invention has a heavy load characteristic and can transmit the power generated by a power source to a component and drive the component to rotate by a preset angle. To more clearly illustrate the present invention, a preferred embodiment is given below and described in detail with reference to the accompanying drawings. Please refer to Figures 1 to 4 As shown, the internal drive type indexer of the preferred embodiment of the present invention includes an indexer unit body 100, an inductive connector 200 and a power source taking an alternating current three-phase motor 300 as an example, wherein the indexer unit body 100 is fixedly connected to the motor 300 through a coupling seat 101.

[0086] The indexing unit body 100 of this embodiment includes a rotating unit 10, a stationary unit 20, and a drive shaft 30. The rotating unit 10 is connected to a component. The drive shaft 30 is driven by the input shaft 301 of the motor 300 to push the rotating unit 10 to rotate relative to the stationary unit 20. The aforementioned component is, for example, a tool disc (not shown in the figure) that forms part of a disc-type tool magazine in the field of machine tools. When the tool disc is driven to rotate by a preset angle, the positions of the cutting tools arranged on the periphery of the tool disc are simultaneously changed, so that the subsequent tool change operation can be carried out smoothly. The following description focuses on the relative relationships between the various components, and their assembly order is not limited to the described one.

[0087] Please refer to Figures 5 to 9 As shown, the rotating unit 10 includes an output shaft collar 11, a first indexing structure 12, a second indexing structure 13, a first fixing ring 14, a second fixing ring 15, a first oil seal 16, and a second oil seal 17.

[0088] The output shaft collar 11 is an annular body with an outer ring surface and an inner ring surface. The output shaft collar 11 has a coupling ring 111 protruding from the outer ring surface, a convex ridge 112 protruding from the inner ring surface, and a plurality of screw holes 113 arranged radially along the circumference. Among them, the coupling ring 111 has a plurality of mounting holes 111a arranged along the periphery for locking the tool disc, so that the output shaft collar 11 and the tool disc are combined into one body; the convex ridge 112 divides the inner ring surface into an upper ring surface 11A and a lower ring surface 11B. The upper ring surface 11A is a stepped ring surface. The convex ridge 112 has a first surface 112a and a second surface 112b facing each other, and a plurality of shaft holes 112c penetrating the first surface 112a and the second surface 112b along the periphery. One end of the aforementioned screw hole 113 penetrates the outer ring surface, and the other end communicates with the shaft hole 112c.

[0089] The first indexing structure 12 includes a plurality of first indexing members exemplified by rollers 12a. These rollers 12a are respectively penetrated by a corresponding shaft 12b and can rotate relative to the shaft 12b. One end of the shaft 12b is inserted into the shaft hole 112c of the convex ridge 112, and the shaft 12b is abutted by a bolt 12c locked in the screw hole 113 and fixed to the output shaft collar 11. Thus, the rollers 12a are located on the first surface 112a and are arranged along the upper ring surface 11A. The second indexing structure 13 includes a plurality of second indexing members exemplified by rollers 13a. The rollers 13a are penetrated by a shaft 13b and can rotate. The shaft 13b is inserted into the shaft hole 112c of the convex ridge 112 and is abutted by a bolt 13c locked in the screw hole 113, so that the rollers 13a are located on the second surface 112b and are arranged along the lower ring surface 11B. In particular, the rollers 12a as the first indexing members and the rollers 13a as the second indexing members are arranged in a staggered manner, as Figure 8 andFigure 9 As shown, there will be a roller 13a between two adjacent rollers 12a.

[0090] The first fixing ring 14 and the second fixing ring 15 are annular bodies. A first engaging groove 14a is provided on the inner ring surface of the first fixing ring 14, and a second engaging groove 15a is provided on the inner ring surface of the second fixing ring 15; the first oil seal 16 is placed in the first engaging groove 14a, and the second oil seal 17 is placed in the second engaging groove 15a. The first fixing ring 14 is fixedly connected to the front end of the output shaft ring 11 by a plurality of bolts 18, and the second fixing ring 15 is fixedly connected to the rear end of the output shaft ring 11 by a plurality of bolts 18.

[0091] The combination of the above-mentioned output shaft ring 11, the first indexing structure 12, the second indexing structure 13, the first fixing ring 14, the second fixing ring 15, the first oil seal 16 and the second oil seal 17 is integrated and can be driven to rotate. Among them, it is preferably that the first fixing ring 14 is fixedly connected at the last stage during the assembly of the indexing unit body 100.

[0092] Please cooperate with Figure 10 and Figure 11 As shown, the stationary unit 20 includes a first fixing seat 21, a second fixing seat 22, a connecting seat 23, a first bearing 24, a second bearing 25 and a roller bearing 26.

[0093] Both the first fixing seat 21 and the second fixing seat 22 are disc-shaped. The connecting seat 23 is connected to the first fixing seat 21 at a different first end and to the second fixing seat 22 at a second end. In this embodiment, the first end of the connecting seat 23 is formed by a disc body 231, the second end is formed by a column body 232, and the column body 232 is connected to the disc body 231. The first fixing seat 21 is fixedly connected to the disc body 231 by a plurality of bolts 27, and the second fixing seat 22 is also fixedly connected to the column body 232 by a plurality of bolts 27. Thus, the connecting seat 23 makes the first fixing seat 21 and the second fixing seat 22 be spaced apart. In addition, a convex wall 231a is provided on the circumferential surface of the disc body 231, and the disc body 231 has a first through hole 231b. The first bearing 24 is placed in the first through hole 231b. The column body 232 has an avoidance concave surface 232a ( Figure 4 refer to), the second fixing seat 22 has a second through hole 22a, and the second bearing 25 is placed in the second through hole 22a. The first through hole 231b and the second through hole 22a are arranged at an eccentric position.

[0094] The roller bearing 26 is a component including an inner ring and an outer ring that can rotate relative to each other. Please cooperate with Figure 13As shown, the assembled roller bearing 26 is located between the output shaft collar 11 and the disc body 231. One side surface of the roller bearing 26 is simultaneously abutted by a part of the side surface of the first fixing ring 14 and a part of the side surface of the first fixing seat 21. The other side surface of the roller bearing 26 is simultaneously abutted by the stepped upper ring surface 11A of the output shaft collar 11 and the convex rib 231a of the disc body 231. Thus, the roller bearing 26 is positioned and can bear loads in all directions.

[0095] The combination of the above-mentioned first fixing seat 21, second fixing seat 22, connecting seat 23, first bearing 24, second bearing 25 and roller bearing 26 forms an integral body, and the second fixing seat 22 is fixedly connected to the joint seat 101 by a plurality of bolts 28 so that the foregoing components are in a stationary state. The structural relationship between the assembled rotating unit 10 and the stationary unit 20 includes: the output shaft collar 11 is located between the first fixing seat 21 and the second fixing seat 22, the connecting seat 23 is located in the output shaft collar 11, and the first oil seal 16 is located between the first fixing ring 14 and the first fixing seat 21, and the second oil seal 17 is located between the second fixing ring 15 and the second fixing seat 22.

[0096] Please continue to refer to Figures 11 to 15 As shown, the drive shaft 30 has a shaft body 31 and a first cam 32 and a second cam 33 that are arranged at intervals before and after and are connected to the shaft body 31. The first cam 32 and the second cam 33 take the center C of the base circle of the shaft body 31 as the center, and the first cam 32 and the second cam 33 are arranged with different biases. The drive shaft 30 passes through the first bearing 24 and the second bearing 25 respectively at two different ends of its shaft body 31, so that the drive shaft 30 can rotate around the axis L of the shaft body 31, and the drive shaft 30 is located in the output shaft collar 11 and deviates from the center of the output shaft collar 11. At the same time, the first cam 32 can push the roller 12a of the first indexing structure 12 ( Figure 14 Refer to), and the second cam 33 can push the roller 13a of the second indexing structure 13 ( Figure 15 Refer to). The avoidance concave surface 232a of the connecting seat 23 in this embodiment is located outside the range of the longest distance from the base circle center C to the working curve of the cam. Thus, when the drive shaft 30 rotates, the first cam 32 and the second cam 33 will not touch the column 232 of the connecting seat 23.

[0097] As Figure 11As shown in the figure, the induction connector 200 includes a shaft connecting tube 201, an induction block 202, and an inductor 203. Both ends of the shaft connecting tube 201 are respectively connected to the shaft body 31 of the drive shaft 30 and the input shaft 301 of the motor 300, so that the drive shaft 30 can be controlled by the motor 300 to rotate; the induction block 202 is connected to the shaft connecting tube 201 and moves synchronously with the shaft connecting tube 201. The induction block 202 has an arc segment 202a; the inductor 203 is connected to the joint seat 101. When the inductor 203 detects the arc segment 202a of the induction block 202, it will issue a control command to control the input shaft 301 of the motor 300 to stop rotating.

[0098] As can be seen from the above, when the motor 300 is started to drive the input shaft 301 to rotate, in addition to the induction block 202 rotating with the shaft connecting tube 201, the drive shaft 30 will also synchronously drive the first cam 32 and the second cam 33 to rotate in the same direction. The rotating drive shaft 30 will guide and push a roller 12a in the first indexing structure 12 to displace. Immediately afterwards, the second cam 33 will continue to push a roller 13a in the second indexing structure 13 to displace. When the drive shaft 30 rotates one circle, the total displacement of the aforementioned rollers 12a and 13a is equal to the rotation amount of the output shaft ring 11. When the component is a cutter head, it means that the cutter on the periphery of the cutter head is controlled to change a cutter position; conversely, during the interval when the drive shaft 30 rotates one circle and the first cam 32 and the second cam 33 do not guide and push the rollers, it means that the output shaft ring 11 stops operating. The aforementioned interval corresponds to the arc segment 202a of the induction block 202.

[0099] In the indexing unit body 100 of the above-mentioned internally driven indexing device, the rollers 12a and 13a that realize the indexing function are arranged inside the output shaft ring 11, reducing the space occupation. Moreover, the drive shaft 30 used to guide and push the aforementioned rollers 12a (13a) also effectively utilizes the surrounding space of the output shaft ring 11 and is arranged therein, so that the volume of the entire indexing unit body 100 is significantly reduced, making the internally driven indexing device of the present invention more flexible in application. Furthermore, the drive shaft 30 and the input shaft 301 of the motor 300 are coaxially arranged, which can reduce the loss of power transmission.

[0100] In the above embodiments, the power source uses an AC three-phase motor 300. Therefore, the driving shaft 30 it is paired with only has cams provided in specific intervals on the circumference, and there are no cams in other intervals. When the driving shaft 30 pushes the roller with its cams, it causes the output shaft collar 11 to rotate. On the contrary, when the driving shaft 30 rotates to an interval without a cam, the output shaft collar 11 is stationary. In other words, the stationary state of the output shaft collar 11 is achieved by the driving shaft 30 having intervals without cams. However, when the power source uses a servo motor, there must be a plurality of cams continuously and equidistantly arranged along the circumference on the circumference of the driving shaft. As shown in Figure 16 and Figure 17 the driving shaft 40 shown, which has a continuously arranged first cam 42 and second cam 43 at different positions on the shaft body 41. The input shaft of the servo motor has a positioning control function and can control the rotation or stationary state of the output shaft collar 11.

[0101] The above are only the preferred and feasible embodiments of the present invention. All equivalent changes made by applying the specification and claims of the present invention should be included within the scope of the patent of the present invention.

Claims

1. An internally driven indexer, characterized in that, Comprising a dividing unit body, the dividing unit body includes: A first fixed seat and a second fixed seat which are spaced apart and stationary; An output shaft collar, which is disposed between the first fixed seat and the second fixed seat, and the output shaft collar can rotate relative to the first fixed seat and the second fixed seat. The inner ring surface of the output shaft collar is divided into an upper ring surface and a lower ring surface; A first dividing structure, including a plurality of first dividing members, which are arranged along the upper ring surface and connected to the output shaft collar; A second dividing structure, including a plurality of second dividing members, which are arranged along the lower ring surface and connected to the output shaft collar, and the second dividing members and the first dividing members are arranged in a staggered manner; and A driving shaft, which is controllably rotatably located in the output shaft collar. A first cam and a second cam are provided on the shaft body of the driving shaft. Wherein, the rotating driving shaft pushes the first dividing member with the first cam and pushes the second dividing member with the second cam.

2. The internally driven indexer according to claim 1, wherein, The output shaft collar has a convex ridge protruding from the inner ring surface. The inner ring surface is divided into the upper ring surface and the lower ring surface with the convex ridge as the boundary. The convex ridge has a first surface and a second surface facing away from each other. The first dividing members are connected to the convex ridge and located on the first surface. The second dividing members are connected to the convex ridge and located on the second surface.

3. The internal drive type indexing device according to claim 1, characterized in that, The driving shaft rotates around an axis as the center of rotation, and the axis deviates from the center of the output shaft collar.

4. The internally-driven indexing device according to any one of claims 1 to 3, characterized in that, Including a connecting seat, the connecting seat is located in the output shaft collar and has a first end and a second end which are different. The first end is connected to the first fixed seat, and the second end is connected to the second fixed seat.

5. The inner-driven indexer according to claim 4, wherein, Including a first fixed ring, a second fixed ring, a first oil seal and a second oil seal. Wherein, the output shaft collar has a front end and a rear end which are different. The first fixed ring is fixedly connected to the front end of the output shaft collar, and the second fixed ring is fixedly connected to the rear end of the output shaft collar. The first oil seal is located between the first fixed ring and the first fixed seat, and the second oil seal is located between the second fixed ring and the second fixed seat.

6. The internally driven indexer according to claim 4, characterized in that, Including a roller bearing. The first end of the connecting seat is formed by a disc body. The roller bearing is located between the upper ring surface of the output shaft collar and the outer peripheral surface of the disc body.

7. The inner-driven indexer according to claim 6, wherein, The first cam and the second cam of the driving shaft have the same base circle center. The second end of the connecting seat is formed by a cylinder. The cylinder is connected to the disc body and has an avoidance concave surface, and the avoidance concave surface is located outside the longest distance range from the base circle center to the working curve of the cam.

8. The internally-driven indexer according to claim 6, characterized in that, The disc body has a first through hole, and the second fixed seat has a second through hole. A first bearing is arranged in the first through hole, and a second bearing is arranged in the second through hole; The two different ends of the driving shaft respectively pass through the first bearing and the second bearing.

9. The internally driven indexer according to claim 1, characterized in that, Including an induction connector and a motor. The induction connector includes an induction block and an inductor. The motor has an input shaft, and the input shaft is controllably driven to drive the induction block and the driving shaft to rotate synchronously. The inductor issues a control command when detecting the induction block.

10. The internally driven indexer according to claim 1, wherein, It includes a servo motor which has an input shaft. The input shaft is controlled to drive the drive shaft to rotate. The drive shaft has a first cam and a second cam which are continuously arranged along the circumference at different positions.

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