JPH0596440A - Speed control device for gantry loader - Google Patents

Abstract

PURPOSE:To perform speed control of a gantry loader so as to increase conveying efficiency without damaging a cable rack. CONSTITUTION:An upper foldback part of a flexible cable rack 14 is applied to a gantry loader 2 supported by a supporting member 20 partly in a running interval B. The cable rack 14 is arranged along a running rail 9 to fold back a movable end 14a upward in a U-shape connected to a running body 10. A detecting means for detecting the body placed in the running interval B is constituted of a limit switch 21 provided in the gantry loader 2 and a dog 22 provided on the rail 9. A device provides a deceleration command means 1 for decelerating a running speed of the running body 10 by an override relating to a preset speed command of a quick feed command 26 only at the time of detection by this detecting means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed control device for a gantry loader that supplies a work to a spindle chuck of a lathe.

[0002]

2. Description of the Related Art Conventionally, in a gantry loader, wirings such as signal lines and power supply lines connected to a traveling body are housed in a flexible cable rack arranged along a traveling rail to protect these wirings and traveling. I am trying to secure This cable rack has one end fixed and a movable end folded back in a U shape to be coupled to the traveling body. In the case of a gantry loader having a long traveling distance, the upper folded portion of the cable rack hangs down, so that the folded portion of the cable rack is supported by the support member in the middle of the traveling route.

[0003]

However, in the case where the supporting member is provided as described above, when the traveling body is caused to travel at a high speed close to its maximum capacity in order to improve the transport efficiency, the supporting member of the cable rack causes the traveling member to travel. The support may be damaged by friction. Therefore, there has been a problem that the traveling speed has to be set to a speed considerably lower than the maximum capacity, and the transport efficiency becomes low.

It is an object of the present invention to provide a speed control device for a gantry loader which can improve the transfer efficiency without causing damage to the cable rack.

[0005]

According to the speed control device of the present invention, the movable end of a flexible cable rack arranged along a traveling rail is folded back upward in a U-shape and connected to a traveling body.
It is applied to a gantry loader provided with a support member that supports a folded back portion of a cable rack in a predetermined traveling section. In the gantry loader having this structure, a detection means is provided for detecting that the traveling body is in the traveling section, and a deceleration command means for decelerating the traveling speed of the traveling body with respect to the set speed command is provided only when detected by this means. ..

[0006]

In the traveling section where the folded portion of the cable rack is not supported by the supporting member, the traveling body travels at a high traveling speed based on the set speed command. When the folded portion of the cable rack travels in the traveling section supported by the support member, the detection means detects this and the deceleration command means responds to the detection to set the traveling speed of the traveling body based on the set speed instruction. Decelerate to a running speed that is slower than the speed. This deceleration reduces friction with the support member of the cable rack.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the relationship between a gantry loader 2, a turret type twin-spindle lathe 3, and its control system. The two-axis lathe 3 includes two spindle chucks 4 and two tool turrets 5. A supply / discharge station 8 for supplying and discharging the work is provided on the side of the two-axis lathe 3.

The gantry loader 2 transfers a work between the spindle chuck 4 and the feeding / discharging station 8, and has a traveling body 10 that travels on a rail 9 installed above the biaxial lathe 3. A front-rear moving table 11 is provided on the traveling body 10, an elevating rod 12 is provided on the front-rear moving table 11 so as to be vertically movable, and a loader head 13 for holding a work is provided at a lower end of the elevating rod 12. That is, the loader head 13 is moved by moving the traveling body 10 left and right (X direction), moving the forward and backward moving table 11 forward and backward (Z direction), and moving the lifting rod 12 up and down (Y direction).
Can move in three dimensions.

A flexible cable rack 14 is arranged along the traveling rail 9 and a movable end 14a thereof is folded back in a U-shape to be coupled to the traveling body 10. A support member 20 for supporting the folded-back portion of the cable rack 14 in a predetermined traveling section B is provided in the middle of the rail 9.
That is, in the traveling section B in which the traveling body 10 travels above the twin-spindle lathe 3, the folded portion of the cable rack 14 is supported by the support member 20 so as not to apply a load due to slack.

The cable rack 14 includes a gantry loader 2
A signal line, a power line, and the like that connect between the control device and the power source for controlling the vehicle and the traveling body 10 are housed. Cable rack 14
In FIG. 2, a large number of frame-shaped links 15 are sequentially rotatably connected as shown in FIG. Each link 15 is formed by connecting a pair of left and right side plates 16 with upper and lower cover plates 17, and a connecting pin 18 for connecting the links 15 to each other on the inner surface of the side plate 16.
And a connection hole 19 is provided.

The traveling body 10 of the gantry loader 2 is a traveling body.
For example, a limit switch 21 is provided as detection means for detecting that 10 has approached the traveling section B, and a dog 22 for turning on the limit switch 21 is arranged in the traveling section B of the rail 9.

The NC device 23 is a control device having a machining program 24 for controlling the machining operation of the two-axis lathe 3 and a loader program 25 for controlling the operation of the gantry loader 2.
The loader program 25 includes the traveling body 10 of the gantry loader 2.
Is included at a high speed of 100 m / min. The programmable controller 27 is
It is means for executing a sequence control command or the like of the machining program 24 and the loader program 26. In the program of the programmable controller 27, the deceleration command means 1 is provided. The deceleration command means 1 receives the ON signal of the limit switch 21, that is, the detection signal of the traveling section B, and responds to this detection signal, the fast-forward command 26 of the loader program 25.
The traveling speed (100 m / min) determined by is overridden and the traveling speed is halved (50 m / mi).
The process of decelerating to n) is performed. The detection signal line connecting the programmable controller 27 and the limit switch 21 is also stored in the cable rack 14.

The operation of the above configuration will be described. The operation of the gantry loader 2 is controlled by the loader program 25 of the NC device 23, and the traveling speed of the traveling body 10 at the time of fast-forwarding is controlled by the fast-forwarding command 26 of the loader program 25 at a high speed (100 m / mi).
n). Therefore, the traveling section A from the feeding / discharging station 8 to the two-axis lathe 3, that is, the cable rack
When the traveling body 10 travels in a section where the folded-back portion of 14 is not supported by the supporting member 20, the traveling body 10 is driven to travel at a high speed.

On the other hand, when the traveling body 10 travels in the traveling section B, that is, the section where the folded portion of the cable rack 14 is supported by the supporting member 20, as shown in FIG.
The limit switch 21 is turned on by the interference of the dog 22. That is, at this time, the limit switch 21 detects that the traveling body 10 is in the traveling section B, and the detection signal is input to the programmable controller 27. In response to this, the deceleration command means 1 of the programmable controller 27
Overrides the traveling speed (100 m / min) set by the fast-forward command 26 of the loader program 25, and decelerates to 1/2 the traveling speed (50 m / min). Therefore, sliding friction or the like of the folded portion of the cable rack 14 supported by the supporting member 20 is reduced, and as a result,
The cable rack 14 can be prevented from being damaged.

As described above, only the traveling section B rubbed by the supporting member 20 is decelerated and the other traveling section A is driven at a high speed, so that it is possible to improve the transfer efficiency while protecting the cable rack 14. Also, limit switch 21
Since the speed is reduced by the override in response to the detection signal by the loader program 25, it is not necessary to set the speed stage in the fast-forward command 26 of the loader program 25, and the loader program 25 can be simple.

In the above embodiment, the limit switch 21
However, the detection means for detecting that the traveling body 10 is in the traveling section B may be constituted by, for example, a photoelectric switch and a mark to be detected by the photoelectric switch.

[0017]

The speed control device for a gantry loader according to the present invention applies to the speed control device only when the detecting means detects that there is a traveling body in the traveling section where the folded portion of the cable rack is supported by the supporting member. Since the traveling speed of the traveling body is decelerated with respect to the set speed command by the deceleration command means that responds, damage to the cable rack due to sliding friction and the like can be prevented, and in the traveling section where the folded back portion of the cable rack cannot be supported, The traveling body can be traveled at high speed, and the transfer efficiency of the gantry loader can be improved.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a partially enlarged perspective view of a cable rack of the gantry loader in the embodiment.

FIG. 3 is an explanatory diagram showing the operation of the embodiment.

[Explanation of symbols]

1 ... Deceleration command means, 2 ... Gantry loader, 3 ... 2-axis lathe, 9 ... Rail, 10 ... Traveling body, 14 ... Cable rack, 20
… Supporting member, 21… Limit switch, 22… Dog, 25…
Loader program, 26 ... Fast forward command, 27 ... Programmable controller

Claims (1)

[Claims] 1. A support member for supporting a folded-back portion of a cable rack in a predetermined traveling section by folding a movable end of a flexible cable rack arranged along a traveling rail upward in a U-shape and coupling it to a traveling body. And a deceleration command means for decelerating the traveling speed of the traveling body with respect to the set speed command only when the traveling means detects that the traveling body is in the traveling section. Control device.