JPH06315840A - Positioning confirming device for tool magazine - Google Patents

Abstract

PURPOSE:To provide a positioning confirming device utilizing two types of signals: the tool pot count signal and the tool count signal from a tool pot position detecting sensor, and confirming the correct stop position of a tool via the coincidence/noncoincidence of them. CONSTITUTION:When a tool magazine 2 is rotated, two count numbers of the tool pot count signal output from a tool magazine rotation control unit 9 counting the tool pot 3 and the tool pot count signal output from a tool pot position detecting sensor are collated, and the correct positioning state of a specified tool is confirmed via the coincidence/noncoincidence of them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning confirmation device for confirming a correct stop state of a tool associated with a cyclic indexing operation of a tool magazine in a machine tool.

[0002]

2. Description of the Related Art Conventionally, the correct stop state of a tool associated with the cyclic indexing operation of a tool magazine of a machine tool is to rotate the tool magazine and position a command pot to stop the tool pot counter. This is executed only by the signal for the tool pot counter output from the rotation control unit. For this reason, the tool pot counter signal output from the tool magazine rotation control unit is instructed due to electrical noise, a defective feedback signal from the accessory pulse coder for tool magazine rotation, or a trouble in the tool magazine drive transmission gear. Occasionally, the pot counter signals do not match.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention According to the present invention, the conventional tool pot counter signal is caused by electrical noise, a defective feedback signal from an accessory pulse coder for rotating a tool magazine, or a trouble of a gear for transmitting a tool magazine drive. In view of this, it is an object to solve this. In view of the above problems, a positioning confirmation device for confirming a correct stopped state of a tool by using a double signal of a tool pot counter signal and a counter signal from a tool pot position detection sensor is used to confirm whether the two tools match or do not match. The purpose is to provide.

[0004]

SUMMARY OF THE INVENTION The present invention provides a tool pot count signal output from a tool magazine rotation control unit that counts the tool pot when the tool magazine rotates, and a tool pot count signal based on a tool pot position detection sensor signal. Match the two count values with the output,
This is a confirmation device characterized by confirming the correct positioning state of the designated tool based on whether or not they match.

According to the present invention, it is possible to check the correct positioning state of the designated tool by comparing the two count values, and confirming the correct positioning state of the specified tool based on the match / mismatch between the two, and when it is abnormal, It is possible to prevent machining errors and damages of tools and workpieces due to erroneous selection of command tools by stopping operation.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments shown in the drawings will be described below. Figure 1
2 is a schematic block diagram showing a tool magazine positioning confirmation device of the present invention, and FIGS. 2A and 2B are flow chart diagrams showing the processing of the present invention.

FIG. 1 shows a machining center 1 and its automatic tool changer ATC. A tool magazine 2 is provided with tool pots 3 ..., and a tool of the tool pot 3 in a tool change position (a) is provided by a change arm 4. And replace the tool T of the spindle 5. Each tool pot 3 of the tool magazine 2 is attached to a chain wound around two front and rear sprockets 6 and 7, and on the drive side of the tool magazine 2 is a motor M1 for driving the magazine rotation via a gear train 8 and an accessory. It is cyclically driven by the pulse encoder P1. Further, the motor M1 for driving the magazine rotation and the attached pulse encoder P
1 is controlled by the magazine rotation control unit 9 and the programmable controller PC, and the counter CA in the programmable controller 10 counts the tool pot count signal output. The tool change position (a)
Is provided with a tool pot position detection sensor 11, and the counter CB counts the output of the sensor 11 as a tool pot count signal output. The programmable controller PC collates the count values of the counters CA and CB, and if the count values of both counters are "mismatch", "tool pot positioning stop error" and "alarm message and prohibit next operation". . Further, if the count values of both are "match", it is programmed to the constituent function of "continuing the next operation" as "normal tool pot positioning stop". 10
NC device is the programmable controller PC
While being coupled to each axis of the machining center 1 (X,
It is connected to a Y, Z) servo motor (not shown) and controlled in operation.

The configuration of the present invention is as described above, and will be described below with reference to the flow chart of FIG. Prior to tool exchange, the "tool magazine unit" 2,100 is "stop magazine rotation" (20) or "magazine rotation command" to rotationally position the next tool at the tool exchange position (a).
(21) as "control unit for rotating tool magazine" (2
Command 2). With this, the "tool magazine rotation gear" (8) is rotated while the "tool magazine rotation motor" (M1) is activated to detect rotation of the "magazine rotation detection pulse encoder" (P1), and the "tool magazine rotation pulse" (P1) is rotated. Circulate the tool pot of the magazine ”(3). The "tool magazine position detection sensor signal" (28) is output as the "tool pot count signal" (b) while the "tool magazine rotation or stop" (27) is performed by the above operation. Further, the "tool magazine rotation control unit" (9) also outputs the "tool pot count signal" (a).

The "tool pot count signal" (a)
(B) indicates "Count command input of counter CA".
(30), "Count command input of counter CB" (3
3), "preset counter CA" (31), "preset counter CB" (34), and "counter CA"
After executing "count value" (32) and "counter CB / count value" (35), "count value comparison of counter CA and CB" (36) is performed. If the count values of both are "mismatch" (37), "tool pot positioning stop abnormality" (38) and "alarm message and prohibit next operation" (39) are performed. In addition, the count value of both is "match"
If it is (37), "Tool pot positioning stop normal" (4
0) is a program that "continues the next operation" (41).

However, the circuit using the double tool pot count signal determines whether the operation is normal or abnormal, and when the operation is abnormal, the operation stop processing is stopped. Damage can be prevented.

It is needless to say that the present invention is not limited to the above-mentioned one embodiment, and design changes can be made within the scope of the invention. The system of the tool magazine 2 is not limited to the one shown in the figure, and may be a drum system.

[0012]

[Effect] When the tool magazine positioning confirmation device according to the present invention is used, the two count values are collated, and the correct positioning state of the designated tool is confirmed by the coincidence and non-coincidence of the two to determine whether it is normal or abnormal. When there is an abnormality, the operation is stopped, and there is the effect that machining errors due to erroneous selection of the command tool and damage to the tool and work can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing a positioning confirmation device for a tool magazine of the present invention.

FIG. 2 is a flowchart showing a process of the present invention.

[Explanation of symbols]

 1 Machining center 2 Tool magazine 3 Tool pot 8 Gear train 9 Tool magazine rotation control unit 10 NC device 11 Tool pot position detection sensor PC programmable controller CA counter CB counter (a) Tool pot count signal (b) Tool pot count signal ( a) Tool change position

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[Procedure amendment]

[Submission date] September 22, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Added

[Correction content]

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing a positioning confirmation device for a tool magazine of the present invention.

FIG. 2 is a flow chart showing the process of the present invention.

FIG. 3 is a flow chart showing the process of the present invention.

[Explanation of symbols] 1 Machining center 2 Tool magazine 3 Tool pot 8 Gear train 9 Tool magazine rotation control unit 10 NC device 11 Tool pot position detection sensor PC Programmable controller CA, CB Counter

Claims (1)

[Claims] 1. When the tool magazine rotates, two count numerical values are output: a tool pot count signal output from a tool magazine rotation control unit that counts the tool pot and a tool pot count signal output from a tool pot position detection sensor signal. A tool magazine positioning confirmation device characterized by performing collation and confirming the correct positioning state of the specified tool based on whether they match or not.