JP2513682Y2 - Automatic indexing device for swivel turret - Google Patents

Description

[Detailed Description of the Invention] << Industrial Application Field >> The present invention relates to an automatic indexing device for a tool post in an NC machine tool or a machining center.

<< Prior Art >> In NC machine tools and machining centers, a plurality of cutting tools are held on a tool rest, and the tool rest is rotated to select and use a machining tool.

In a machine tool that holds a plurality of such cutting tools on a tool post, the tool post is automatically indexed. As a conventional automatic indexing device, for example, as shown in FIG.
On the peripheral surface of the rotary ring plate (51) that is fixed to the rotary shaft of the tool post, dogs (5
2) protrudingly formed, the dog (52) of the rotating ring plate (51)
Corresponding to the above, the counting means composed of the origin detection sensor (53) and the two counter sensors (54) and (55) is arranged, and each sensor detects the dog (52), thereby There are some that are automatically indexed.

<Problem to be Solved> However, in the above-described tool post automatic indexing device, the arrangement positions of the two counter sensors constituting the counting means are set at one position while the tool post is stopped at the working position. The counter sensor (54) detects one of the dogs (52), and the other counter sensor (55) detects the adjacent two dogs (52) (5).
2) Since they were set so that they were located in the center of each other, as shown in FIG. 8, both counter sensors (54) (5
In 5), the dog (52) is detected at the same timing during forward rotation (F) and during reverse rotation (R). As a result, the malfunction of the counter sensors (53) (54) could be detected, but the rotation direction could not be checked.
Therefore, there is a problem that even if the command rotation direction and the actual rotation direction are different due to a defect of the magnet switch, the solenoid, etc. in the tool post drive control mechanism, this cannot be detected.

The present invention has been made focusing on such points.
It is an object of the present invention to provide a counting mechanism capable of detecting the rotation direction.

<< Means for Solving the Problem >> In order to achieve the above-mentioned object, the invention of claim 1 is configured such that a tool post 7 holding a plurality of tool tools can be driven to rotate, and a rotary shaft of the tool post 7 is provided. A rotary ring 9 is fixed to the rotary ring 9, a plurality of dogs 11 corresponding to the tool holder of the tool rest 7 are formed on the rotary ring 9, and counting means 10 for detecting the dogs 11 is arranged. Turret 7 based on the results
Is an automatic indexing device for a swivel tool post that detects the rotation direction of the tool, the counting means 10 having a sensor 13 for origin detection and two counter sensors 14 and 15, and the tool post 7 being stopped at the working position. In this state, the origin detection sensor 13 is arranged in a plane including any one of the plurality of dogs 11 and the rotation axis of the rotation ring 9, and the rotation ring is moved from the stopped state at the working position. When 9 rotates forward F and reverse R
Displace the two counter sensors 14 and 15 to one dog side rather than the central part between the adjacent dogs so that the order in which the dog detection signals are output from the two counter sensors 14 and 15 is reversed. Place and two counter sensors 14
The rotation direction of the tool rest 7 is detected based on the order in which the dog detection signal is output from 15.

Further, in the invention of claim 2, the tool rest 7 holding a plurality of cutters is configured so as to be capable of being driven to rotate, the rotary ring 9 is fixed to the rotary shaft of the tool rest 7, and the tool rest 7 is attached to the rotary ring 9. A plurality of dogs 11 corresponding to the blade holding part of the dog 11 are formed, and a counting means 10 for detecting the dogs 11 is arranged.
An automatic indexing device for a swivel tool post that detects the rotation direction of the tool post 7 based on the detection result of 1. The counting means 10 has a sensor 13 for origin detection and one counter sensor 14, and the tool post 7 Is stopped at the working position, set the origin detection sensor 13 to one of the dogs 11 out of the plurality of dogs 11.
And a rotation axis of the rotation ring 9 are arranged in a plane, and the counter sensor is started from the rotation start of the rotation ring 9 depending on whether the rotation ring 9 makes a forward rotation F or a reverse rotation R from a stopped state at the working position. Until the dog 11 is detected by the counter sensor 14, the counter sensor 14 is arranged so as to be displaced to one dog side from the central portion between adjacent dogs so that the time until the dog 11 is detected is different. The rotation direction of the tool rest 7 is detected based on the time.

<< Operation >> The present invention operates as follows, for example, as shown in FIGS. 1 to 6.

For example, as shown in FIG. 1, when the origin detecting sensor 13 is arranged so as to be displaced in the direction of the rotation axis of the rotating ring 9, the origin detecting sensor 13 is in a state where the tool rest 7 is stopped at the working position. Some dogs 11 are not detected by the above, but this is only because the dogs 11 are displaced with respect to the origin detection sensor 13 in the direction of the rotation axis of the rotary ring 9.
The dog 11 is stopped in the plane including the origin detection sensor 13 and the rotating shaft of the rotating ring 9 when the dog is stopped at the working position. That is, even in the case shown in FIG. 1, by shifting the origin detection sensor 13 in the direction of the rotation axis of the rotation ring 9, one of the dogs 11 among the plurality of dogs 11 is stopped while the tool rest 7 is stopped at the working position. Any one of the dogs 11 is detected by the origin detection sensor 13.

 The invention according to claim 1 operates as follows.

That is, when the rotation of the rotary ring 9 is started from the stopped state at the working position, the dog detection signals are output from the counter sensors 14 and 15, respectively. The order of signals is reversed depending on whether the rotating ring 9 makes a forward rotation F or a reverse rotation R.

That is, in the stopped state at the working position, for example, as shown in FIG. 2, the counter sensor 14 is displaced to a position which is advanced in the clockwise direction in FIG. 2 from the central portion between adjacent dogs,
Moreover, when the counter sensor 15 is displaced to a position which is moved counterclockwise in FIG. 2 from the central portion between adjacent dogs, as shown in FIG. When the rotation of 9 is started, the dog 11 is detected in order of the counter sensor 14 and the counter sensor 15. On the other hand, in the case of reverse rotation R, the dog 11 is detected in order of the counter sensor 15 and the counter sensor 14.

That is, the rotation direction of the rotary ring 9 can be detected by the order of the dog detection signals output from the counter sensors 14 and 15, and whether the actual rotation direction of the tool rest 7 and the commanded rotation direction match with each other. Can be detected.

 Further, the device of claim 2 operates as follows.

That is, for example, as shown in FIG.
6 is displaced to a position which is advanced in the clockwise direction in FIG. 5 from the central portion between adjacent dogs, as shown in FIG. 6, in the case of forward rotation F, rotation of the rotary ring 9 is started. The time from when the counter sensor 14 detects the dog 11 is shorter than the time when the counter sensor 14 detects the dog 11 in the case of the reverse rotation R.

That is, the rotation direction of the rotation ring 9 can be detected based on the time from the start of rotation of the rotation ring 9 to the detection of the dog 11 by the counter sensor 14, and the actual rotation direction of the tool rest 7 and the command can be detected. It is possible to detect whether or not the rotation direction is the same.

<< Embodiment >> FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is an overall view of an NC controlled turret lathe to which the present invention is applied.

The turret lathe (1) is composed of main parts such as a headstock (2), a chuck (3), a bed (4), a carriage (5), a lateral feed table (6), and a swivel tool rest (7). Automatic tool post indexing device (8) according to the present invention on the table (7)
Is attached.

This automatic tool post indexing device (8) comprises a ring plate (9) fixed to the rotary shaft of the tool post (7) and a counting means (10) arranged corresponding to the ring plate (9). It is configured. The ring plate (9) has a dog (11) formed on the outer peripheral surface portion thereof so as to correspond to the tool holding portion of the tool rest (7), and one dog (11) of the plurality of dogs (11) is formed.
A) is formed to be slightly longer in the axial direction, and the extended portion is formed in the reference dog (12). In addition, counting means (1
0) is one origin detection sensor (13) arranged corresponding to the rotation area of the reference dog (12) and the counting dog (1
It is composed of two counting counter sensors (14) (15) arranged corresponding to the rotation region of 1), and each sensor (1
3) (14) and (15) are formed by proximity switches or limit switches, respectively.

The origin detection sensor (13) arranged corresponding to the rotation area of the reference dog (12) is the tool post (7).
Is arranged at a position corresponding to one of the dog forming positions in a state where the tool rest (7) is stopped at the working position, and the tool counter (7) is stopped at the working position for the two counting counter sensors (14) (15). It is arranged so as to be located between the dogs (11) (11) adjacent to each other in a state. And this dog (11) (1
1) Each counting counter sensor (1
4) One of the first counting counter sensors (1
4) is arranged at a position that is advanced in the clockwise direction from the center between dogs, and the other second counting counter sensor (15) is in a position that is advanced counterclockwise from the center between dogs. It is located at.

In the tool post automatic indexing device (8) configured in this way,
When the turret (7) is driven to rotate from the state where the origin detection sensor (13) is detecting the reference dog (11a) when the 1st station is used, when the tool is rotated forward as shown in the time chart of FIG. In (F), the first counting counter sensor (14) and the second counting counter sensor (15) detect the dog (11) in this order and transmit a detection signal, and when the tool rest (7) rotates in the reverse direction. In (R), the dog (11) is detected in order of the second counting counter sensor (15) and the first counting counter sensor (14), and the detection signal is transmitted. Detection signals from the counting counter sensors (14) and (15) are transmitted to a central processing unit (CPU) (not shown) to count the number of dogs and monitor the rotation direction of the tool rest (7). In this case, there is a time difference of 16 milliseconds or more between the rising timing of the first counting counter sensor (14) and the rising timing of the second counting counter sensor (15). This time difference is necessary to judge the time difference in PMC control.

Then, when the rotation direction detected by the counting counter sensors (14) (15) and the command rotation direction are different, an alarm is issued. In addition, when only the dog detection signal from one counting counter sensor is continuously input, the counting counter sensor is in a malfunction state, so an alarm should be issued in this case as well. There is.

FIG. 5 shows another embodiment of the present invention in which the second counting counter sensor in the above-mentioned embodiment is omitted, and the dog detecting timing in this case is as shown in FIG. In this case, the rotation direction is determined after the start of rotation until the first dock detection signal rises. When the first dock detection signal rises within a certain period of time, a positive rotation (F) occurs. When the time until the first dock detection signal rises is longer than the fixed time, the reverse rotation (R) is determined.

Then, the dock detection signal is counted to control the turning amount as in the conventional case.

In the above embodiment, the tool post of the lathe is described, but it goes without saying that a rotary type indexing mechanism can be applied to a tool magazine, a work magazine or the like.

<Effect> Based on the order of the dog detection signals output from the two counter sensors or the time until the dog is detected by one counter sensor, the actual rotation direction of the tool rest and the command rotation direction match. Since it is configured so that it can be determined whether or not it is present, an alarm can be issued when the actual rotation direction of the tool rest and the command rotation direction do not match. This can prevent the work piece from being processed by an incorrect cutting tool.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, FIG. 1 is a perspective view showing one embodiment, FIG. 2 is a front view thereof, and FIG. 3 is an NC control type to which the present invention is applied. Fig. 4 is an overall view of the turret lathe, Fig. 4 is a time chart showing the dog detection timing in the first embodiment, Fig. 5 is a view corresponding to Fig. 2 of another embodiment, and Fig. 6 is a view corresponding to Fig. 4 of another embodiment. FIGS. 7 and 8 show a conventional example, FIG. 7 is a diagram corresponding to FIG. 2 of the conventional example, and FIG. 8 is a diagram corresponding to FIG. 7 ... Turret, 9 ... Rotating ring, 11 ... Dog, 10 ... Counting means, 13 ... Origin detection sensor, 14/15 ... Counting counter sensor.

Claims (2)

(57) [Scope of utility model registration request] 1. A turret (7) holding a plurality of turrets is configured to be capable of being driven to rotate, and a rotary ring (9) is fixed to a rotary shaft of the turret (7). ) Is formed with a plurality of dogs (11) corresponding to the tool holder of the tool rest (7), and counting means (10) for detecting the dogs (11) is arranged, and the counting means (10) detects An automatic indexing device for a swivel tool post that detects the rotational direction of the tool post (7) based on the result, wherein the counting means (10) is an origin detection sensor (13) and two counter sensors (14). (15) with the tool rest (7) stopped at the working position, the origin detection sensor (13) is connected to any one of the dogs (11) ( 11) and the rotation axis of the rotating ring (9), and arrange them in a plane and stop at the working position. Depending on the state, the order in which the dog detection signals are output from the two counter sensors (14) and (15) is reversed depending on whether the rotating ring (9) rotates forward (F) or reversely (R). The two counter sensors (14) and (15) are arranged so as to be displaced to one dog side with respect to the central portion between adjacent dogs, and the dog detection signal is output from the two counter sensors (14) and (15). An automatic indexing device for a swivel tool post, characterized in that it is configured to detect the rotational direction of the tool post (7) based on the order in which it is performed. 2. A turret (7) holding a plurality of knives is constructed so as to be capable of rotating and driving, and a rotary ring (9) is fixed to a rotary shaft of the turret (7), and the rotary ring (9) is fixed. ) Is formed with a plurality of dogs (11) corresponding to the tool holder of the tool rest (7), and counting means (10) for detecting the dogs (11) is arranged, and the counting means (10) detects An automatic indexing device for a swivel tool post that detects the rotation direction of the tool post (7) based on the result, wherein the counting means (10) is an origin detection sensor (13) and one counter sensor (14). With the tool rest (7) stopped at the working position, the origin detection sensor (13) is connected to one of the dogs (11) among the plurality of dogs (11). Placed in a plane including the rotation axis of the rotation ring (9) and stopped at the working position From the start of rotation of the rotating ring (9) depending on whether the rotating ring (9) rotates forward (F) or reverse (R), the counter sensor (1
The counter sensor (14) is arranged so as to be displaced to one dog side from the central portion between adjacent dogs so that the time until the dog (11) is detected by 4) differs. ) Is configured to detect the rotation direction of the tool post (7) based on the time until the dog (11) is detected by (1).