JP5295542B2 - Automatic tool changer drive - Google Patents

Description

  The present invention relates to a drive device for an automatic tool changer.

  An automatic tool changer such as a machining center automatically performs a work of taking out a necessary tool from a tool magazine holding many tools on the outer periphery and replacing the tool with a tool held on a spindle. As a drive device for the tool magazine of this type of automatic tool changer, for example, an apparatus as shown in FIGS. 4 and 5 is known (Patent Document 1).

  The rotation of the motor 3 is decelerated by the speed reducer 5 and is taken out as the rotation of the drive sprocket 7. The drive sprocket 7 rotates the endless chain C. On the other hand, in the tool magazine B of the automatic tool changer 9, a large number of tool receiving pots P are connected by this endless chain C at equal intervals. When the endless chain C is rotated by the rotation of the drive sprocket 7 of the speed reducer 5, the tool receiving pot P of the tool magazine B is rotated, and a tool (not shown) can be replaced.

  The entire motor 3 is attached to the frame 14 of the automatic tool changer 9 via bolts 16. The speed reducer 5 is fixed to the casing 11 of the motor 3 with bolts 13. The speed reducer 5 is a so-called swinging internal mesh type planetary gear speed reducer having an external gear 10 and an internal gear 12, and the external gear 10 is moved into the internal gear 12 by the rotation of the motor 3. It swings while being in contact with it, and the relative rotation between the external gear 10 and the internal gear 12 is taken out from the drive sprocket 7 as an output.

  On both sides in the axial direction of the external gear 10, first and second carriers 18 and 20 that are synchronized with the rotation component of the external gear 10 are arranged and connected by the bolt 13. In the speed reducer 5, the rotation of the external gear 10 is restricted and only the swing is allowed by this configuration, and the meshing position of the external gear 10 and the internal gear 12 is moved by the swing. It is said that.

  When the meshing position is rotated once by the external gear 10 swinging once, the external gear 10 and the internal gear 12 rotate relative to each other by the difference in the number of teeth, but the rotation of the external gear 10 is restricted. Therefore, as a result, the relative rotation between the external gear 10 and the internal gear 12 is extracted as the rotation on the internal gear 12 side. As a result, the drive sprocket 7 integrated with the speed reducer casing 26 and the bolt 28 rotates via the speed reducer casing 26 integrated with the internal gear 12.

JP-A-10-151540

  However, in such a conventional automatic tool changer drive device, the motor is attached to the back side of the fixed frame of the automatic tool changer, so that maintenance of the motor of the operator is very difficult. There was a problem that there was. However, in order to facilitate this maintenance, for example, if the motor is to be arranged on the front side for the operator (with respect to the operation panel), a power supply cable for the motor or a detection signal transmission cable for the encoder A new problem arises that it is necessary to route the frame to the front side of the fixed frame.

  The present invention has been made to solve such a problem, and the cable for the motor is used regardless of which side of the frame of the automatic tool changer the motor or the speed reducer is assembled. As a result, for example, an automatic tool changer drive device can be provided that facilitates maintenance of the motor by arranging the motor on the frontmost side of the operator. The challenge is to do that.

The present invention includes an external gear and an internal gear that is internally meshed with the external gear, and a speed reducer that decelerates and outputs the rotation of the motor as relative rotation between the external gear and the internal gear. In the automatic tool changer drive apparatus, the first and second carriers synchronized with the rotation components of the external gear are provided on both sides in the axial direction of the external gear, and the motor includes the first and second carriers. A hollow portion is formed in the radial central portion of the speed reducer including the first and second carriers, and penetrates the speed reducer in the axial direction. A cable for the motor is inserted, and the internal gear also serves as a casing of the speed reducer, and a rotary driving body for driving a movable member of the automatic tool changer is fixed to the casing. The first and second The second carrier located on the motor side of the carrier is connected via an adapter that allows the offset to be installed, and the outer periphery of the adapter and the inner periphery of the second carrier are inlay-fitted, and the second carrier By adopting a configuration in which an oil seal is disposed on the outer periphery of the carrier , the above-described problems are solved.

  According to the present invention, the motor is mounted offset from the axial center of the first and second carriers, that is, the radial center of the speed reducer, and the speed reducer is installed at the radial center of the speed reducer. A hollow portion penetrating in the axial direction is formed. For this reason, a hollow part can be easily formed in the radial direction center part of a reduction gear, and the cable for motors can be passed by utilizing this hollow part. Therefore, handling of the cable is easy, and no problem arises in routing the cable, no matter how the motor and the speed reducer are attached to the fixed frame of the automatic tool changer. Therefore, for example, it is possible for the operator to easily arrange the motor on the front side (relative to the operation panel) without any particular difficulty.

  Regardless of how the motor or reducer is arranged relative to the fixed frame of the automatic tool changer, the motor cable can be easily routed. It becomes possible to easily arrange them at various positions.

  Hereinafter, an example of an embodiment of the present invention will be described in detail based on the drawings.

  FIG. 1 is a longitudinal sectional view showing an example of an embodiment of a drive device for an automatic tool changer according to the present invention, and FIG. 2 is an enlarged view of a main part thereof. 3 is a cross-sectional view taken along the line III-III in FIG.

  Referring mainly to FIG. 1, the drive device 48 of the automatic tool changer 46 decelerates and outputs the rotation of the motor 54 as relative rotation between the external gear 50 and the internal gear 52. 56. The external gear 50 is in mesh with the internal gear 52 while swinging.

  First and second carriers 60 and 62 that are synchronized with the rotation component of the external gear 50 (synchronized in a fixed state in this embodiment) are arranged on both sides in the axial direction of the external gear 50. ing.

  The first carrier 60 is fixed to the fixed frame 64 of the automatic tool changer 46 through bolts 67. The motor 54 is coupled to the second carrier 62 with an offset amount L1 offset from the axis O1 of the first and second carriers 60 and 62 via an adapter (described later) 92. A hollow portion 65 that penetrates the speed reducer 56 in the axial direction is formed at the center in the radial direction of the speed reducer 56 including the first and second carriers 60 and 62, and a cable 66 for the motor 54 is formed in the hollow portion 65. (66A, 66B) are inserted.

  The internal gear 52 also serves as the casing 68 of the speed reducer 56. First and second carriers 60 and 62 are rotatably supported by the casing 68 via bearings 61A and 61B, and are used to drive an endless chain 70 which is a movable member of the automatic tool changer 46. A drive sprocket (rotary drive) 72 is fixed via a bolt 71. A tool receiving pot 73 of a tool magazine 71 of the automatic tool changer 46 is attached to the endless chain 70. That is, when the endless chain 70 rotates, the tool receiving pot 73 is driven so that a tool (not shown) can be replaced.

  In this embodiment, the right side of FIGS. 1 and 2 with respect to the fixed frame 64 is the operator side. That is, the motor 54 is positioned on the forefront side (as viewed from the operator) with respect to an operation panel (not shown).

  Hereinafter, the configuration of each unit will be described in more detail with reference mainly to FIGS. 2 and 3.

  A pinion 74 is disposed on the motor shaft 54 </ b> A of the motor 54 so as to be integrally rotatable, and meshes with a gear 78. The gear 78 is incorporated on the input shaft 76 of the speed reducer 56 via a spline 77. An eccentric body 80 (two of 80A and 80B) is integrally formed on the input shaft 76, and the external gear 50 (50A and 50B) is provided via a bearing 82 (82A and 82B) using a plurality of rollers. Are fitted so that they can swing.

  The external gear 50 is formed with 59 trochoidal external teeth 51 and is in mesh with the internal gear 52. The internal teeth of the internal gear 52 are constituted by roller-shaped pins 53, and the number (namely, the number of teeth) is 60. As described above, the internal gear 52 also serves as the casing 68 of the speed reducer 56 and is connected to the drive sprocket 72 via the bolt 71.

  The external gear 50 is formed with a plurality of inner pin holes 84 penetrating in the axial direction of the external gear 50, and an inner pin 88 covered with the inner roller 86 is loosely fitted. The inner pin 88 is integrally formed on the first carrier 60 and is connected to the second carrier 62 by the bolt 90 in a state where the tip is inserted until it abuts against a recess 62A formed on the second carrier 62. Has been.

  Since the first carrier 60 is fixed to the fixed frame 64 of the automatic tool changer 46 via the bolt 67, the rotation of the external gear 50 is restricted via the inner pin 88 and the inner roller 86.

  The motor 54 is attached to the second carrier 62 with a bolt 94 via an adapter 92. The adapter 92 includes a cylindrical opening 93 that fits with the spigot 63 of the second carrier 62 and has a center O2 that is offset from the axis O1 of the first and second carriers 60, 62 by a dimension L1. The motor 54 is fitted in the cylindrical opening 93. That is, the motor 54 is attached to the second carrier 62 while being offset from the axis O1 of the first and second carriers 60 and 62 by the dimension L1 via the adapter 92. Since the adapter 92 is attached to the second carrier 62 and the second carrier 62 is fixed to the fixed frame 64 of the automatic tool changer 46 via the first carrier 60 as described above, the motor 54 eventually becomes Indirectly, it is fixed to the fixed frame 64 of the automatic tool changer 46.

  Since the motor 54 is attached to the second carrier 62 with the offset amount L1 being offset from the axis O1 of the first and second carriers 60, 62, the first, second carriers 60, Empty spaces are secured on both sides in the axial direction of the central portion in the radial direction centered on the 62 axial center O1. In this embodiment, a hollow portion 65 penetrating the speed reducer 56 in the axial direction is formed at the radial center of the speed reducer 56 including the first and second carriers 60 and 62, and this empty space is formed in the hollow space. A cable 65 for the motor 54 (a power supply cable 66A and an encoder detection signal transmission cable 66B (not shown)) is inserted therethrough. That is, the cables 66A and 66B are guided from the back surface side of the fixed frame 64 to the front surface side through the mounting holes 63 of the fixed frame 64, and are connected to the motor 54 via the hollow portion 65 of the speed reducer 56. .

  Reference numeral 96 in the figure denotes a protective pipe connected to the first carrier 60 via a bolt 97, and the inside of the protective pipe 96 is the hollow portion 65. In addition, an oil seal 98A is incorporated in the motor side end of the protective pipe 96, and seals the lubricant in the speed reducer 56 in cooperation with the oil seals 98B and 98C. The oil seal 98A may be a sealing member such as an O-ring.

  Next, the operation of the drive device 48 will be described.

  When the motor 54 is driven through the power supply cable 66 </ b> A and the motor shaft 54 </ b> A rotates, the input shaft 76 rotates through the pinion 74 and the gear 78. When the input shaft 76 rotates, the eccentric body 80 formed integrally with the input shaft 76 rotates, and the external gear 50 swings and rotates via the bearing 82. Since the external gear 50 is constrained to rotate by an inner pin 88 integrally projecting from the first carrier 60 and an inner roller 86 covered by the inner pin 88, the external gear 50 swings once. Each time, the internal gear 52 rotates relative to the external gear 50 by the difference in the number of teeth (60−59) = 1. This relative rotation is transmitted to the drive sprocket 72 via the casing 68 integrated with the internal gear 52, and the tool receiving pot 73 of the tool magazine 71 rotates via the endless chain 70.

  Here, although the motor 54 is disposed in the forefront of the operator, the cables 66A and 66B necessary for driving the motor 54 are routed from the back surface side of the fixed frame 64 via the hollow portion 65 of the speed reducer 56. Since the motor 54 is routed to the motor 54 and the motor 54 is disposed at a position offset from the axis O1 of the speed reducer 56 by the offset amount L1, the cables 66A and 66B are not very wasteful. In this manner, wiring can be made up to the motor 54. Further, since the motor 54 is disposed in the forefront of the operator, maintenance of the motor 54 including the encoder can be performed very easily.

  In addition, according to this invention, it can respond easily even if it is a case where a motor and a reduction gear are attached to the front or back side with respect to the fixed frame of an automatic tool changer by utilizing a hollow part. However, it is not always required that the motor be attached to the front surface of the operator with respect to the fixed frame. This is because the front side is not always easier to maintain as to which side of the fixed frame is easier to maintain. The same applies to the point from which side the motor cable can be easily routed. It is permissible to appropriately determine the arrangement side in consideration of these factors comprehensively including the relationship with other members.

  In the above embodiment, an example is shown in which the first carrier is directly fixed to the fixed frame, and the motor is attached to the second carrier via the adapter. However, in the present invention, the main point is the first carrier. Can be fixed to the fixed frame, and the motor may be mounted in a state offset from the shaft centers of the first and second carriers, and the specific mounting method beyond that is not limited. For example, the first carrier may be fixed to the fixed frame (not directly) via an adapter or a bracket. Further, the motor may be structured to be attached to a fixed frame (not to the second carrier). In this case, a structure that is directly attached to the fixed frame or a structure that is attached via an adapter or a bracket may be used. Furthermore, the motor mounting side may be the opposite side to the side where the fixed frame is present with respect to the first and second carriers (as in the above embodiment) or the same side.

  Further, in the above embodiment, the rotation of the internal gear integrated with the casing rotates the endless chain of the automatic tool changer via the drive sprocket. However, in the present invention, the automatic tool The rotary drive body for driving the movable member of the changer is not necessarily a drive sprocket, and may be a rotary drive body such as a toothed pulley or a gear.

  It can be widely used as an apparatus for driving an automatic tool changer.

The longitudinal cross-sectional view which shows the example of embodiment of the drive device of the automatic tool changer which concerns on this invention 1 is an enlarged view of the main part of FIG. Sectional view along line III-III in FIG. FIG. 1 is a longitudinal sectional view showing an example of a conventional automatic tool changer drive device. FIG. 4 is an overall schematic perspective view of an automatic tool changer in which the driving device of FIG. 4 is incorporated.

Explanation of symbols

46 ... Automatic tool changer 48 ... Drive device 50 ... External gear 52 ... Internal gear 54 ... Motor 56 ... Reduction gear 60 ... First carrier 62 ... Second carrier 64 ... Fixed frame 65 ... Hollow section 66 ... Cable 68 ... Casing 70 ... endless chain (movable member)
72 ... Drive sprocket (rotary drive)
76 ... Input shaft 80 ... Eccentric body 88 ... Inner pin hole 86 ... Inner pin 92 ... Adapter 96 ... Protective pipe O1 ... First and second carrier shaft centers L1 ... Offset amount

Claims (3)

An automatic tool having an external gear and an internal gear with which the external gear internally meshes, and a speed reducer that decelerates and outputs the rotation of the motor as a relative rotation between the external gear and the internal gear In the changer drive,
First and second carriers synchronized with the rotation component of the external gear on both axial sides of the external gear,
The motor is mounted offset from the axis of the first and second carriers;
A hollow portion that penetrates the speed reducer in the axial direction is formed at a radial center portion of the speed reducer including the first and second carriers,
A cable for the motor is inserted into the hollow portion, and the internal gear also serves as a casing of the speed reducer, and a rotary driving body for driving a movable member of the automatic tool changer is fixed to the casing. It is,
The motor is connected to a second carrier located on the motor side of the first and second carriers via an adapter that allows the offset to be installed,
The outer periphery of the adapter and the inner periphery of the second carrier are inlay fitted,
An automatic tool changer drive device, wherein an oil seal is disposed on an outer periphery of the second carrier . Te claim 1 smell,
Before SL first, the first carrier is located in the anti-motor side of the second carrier, protective pipe inside constituting the hollow portion is fixed,
An automatic tool changer drive device, wherein an oil seal is disposed between the protective pipe and the adapter. In claim 1 or 2,
An automatic tool changer drive device characterized in that an inlay fitting portion between the outer periphery of the adapter and the inner periphery of the second carrier and an oil seal disposed on the outer periphery of the second carrier overlap each other when viewed from the radial direction .

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