JPH0516102U - Work delivery machine control device - Google Patents

Abstract

(57) [Summary] [Structure] A loader chuck that holds a workpiece and delivers the workpiece to and from the processing chuck of the processing machine is slid in the axial direction of the processing chuck by a pneumatic cylinder. An exhaust detection device is provided which communicates with the cylinder chamber on the exhaust side when the loader chuck approaches the processing chuck and detects the fluctuation of the exhaust. [Effect] Since it can be detected that the loader chuck has stopped by detecting a decrease in exhaust gas, both end surfaces of the work piece can be reliably brought into contact with the loader chuck and the processing chuck, and the pressure received by the work piece can be properly managed to process the work piece. The work chuck can be held at the optimum position to improve processing accuracy, and the work can be clamped at the proper position of the loader chuck to prevent the work from falling.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a work transfer machine for holding an unprocessed work by a loader chuck to carry it into a working chuck of a working machine, and holding a processed work from the working chuck by a loader chuck to carry it out.

[0002]

[Prior Art]

 Conventionally, as this type of work transfer machine, as shown in Fig. 2, a multi-axis controlled hand [a] is equipped with a loader chuck [b] so that an unprocessed work [e] can be loaded when loading an unprocessed work. It is clamped by the jaws of the chuck [b], carried into the processing machine and pressed against the processing chuck [d], then the loader chuck [b] is opened, and the processing chuck [d] is closed and the processing is started. On the other hand, when the processed work is carried out, the loader chuck [b] that received the work is pressed against the processed work [e], then the loader chuck [b] is closed and the processing chuck [d] is opened to open the processed work [d]. It is known that the work [e] is carried out from the processing machine by sandwiching the work [e] with the claws [c].

[0003]

[Problems to be solved by the device]

 In such a work transfer machine, the above-mentioned pressing force is insufficient in both cases of loading and unloading, and both end faces of the work [e] are in contact with the loader chuck [b] or the processing chuck [d]. If the workpiece [e] is not applied or the pressure applied to the work [e] is weak, the work [e] will not be held at the proper position with respect to the machining chuck [d] when the work is loaded, and the machining accuracy will deteriorate. Also, when the work is carried out, the work [e] may fall without being held securely by the loader chuck [b].

Therefore, in order to solve this problem, conventionally, for example, as shown in FIG. 3, in a work transfer machine of a type in which a loader chuck [b] is pressed against a work [e] by sliding a slide shaft [f], A loader chuck (b) is provided slidably with respect to the arm (h) by a slide bearing (g) and a work (e) is urged by a spring (r), and the load is close to the arm (h). A switch is provided on the proximity switch [nu] to detect that the loader chuck [b] has moved with respect to the arm [chi] against the urging force of the spring [ri], and based on this detection. There is one that controls the slide movement of the slide shaft [f]. However, this increases the weight of the arm [chi] and the hand [a], and the slide bearing [g] is placed in an environment in which chips and cutting oil float, causing the problem of rapid settling.

Further, in the same type of work passing machine, a screw rod [L] which is parallel to the slide shaft [F] is passed through a bracket [W] of the slide shaft [F] and fixed to the machine body, Install a spring [wa] between the screw rod [l] and the bracket [wo], screw a stopper nut [car] that adjusts the mounting length of the spring [wa] to the screw rod [l], and attach it to the bracket. When the limit switch [Yo] is fixed to [Wo] and the slide shaft [F] slides, the spring [W] bends, and when the limit switch [Yo] operates, the slide shaft [F] slides accordingly. There is something to stop. However, in this case, it is necessary to adjust the screwing position of the stopper nut [power] according to the length of the work [e], and when the unprocessed work and the processed work are extremely different in length, There is a problem that the work cannot be pinched during the unloading.

The present invention has been made in view of such a point, and its purpose is to presume a work passing machine of a type in which a loader chuck is slid in the axial direction of a chuck by a pneumatic cylinder. To provide a control device for a work transfer machine, which can reliably transfer a work without causing a problem unlike the conventional one by detecting the stop of the loader chuck through reduction of exhaust of a pneumatic cylinder. is there.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the solution means of the present invention is premised on a work transfer machine that holds a work by a loader chuck and transfers the work to and from the processing chuck of the processing machine. On the other hand, the loader chuck is configured to slide in the axial direction of the chuck for machining by the pneumatic cylinder. Further, when the loader chuck approaches the processing chuck, it is connected to a cylinder chamber on the exhaust side to provide an exhaust detection device for detecting fluctuations in exhaust gas.

[0008]

[Action]

 With the above structure, in the present invention, when the unprocessed work is carried in, the unprocessed work is held by the loader chuck, and then the air is exhausted from the cylinder chamber when brought into contact with the working chuck by the operation of the pneumatic cylinder. .. When the unworked work is pressed against the working chuck, the exhaust flow is reduced. On the other hand, when the processed work is carried out, the air is exhausted from the cylinder chamber when the loader chuck is brought closer to the processed work by the operation of the pneumatic cylinder. Then, when the loader chuck is pressed against the machined work, the exhaust flow is reduced. Therefore, if the decrease in the exhaust flow is detected and the next operation is started, both end faces of the work are surely brought into contact with the loader chuck and the machining chuck, and the pressure received by the work is properly controlled.

[0009]

【Example】

 Embodiments will be described below with reference to the drawings. In FIG. 1, 1 is a slide shaft that slides in the axial direction, 2 is an arm that extends in the radial direction from the tip of the slide shaft 1, and 3 is a hand fixed to the tip of the arm 2 that does not slide on the hand 3. A loader chuck 4 having a pair of claws 5 and 5 for sandwiching a work 7 is provided. On the other hand, 6 is a chuck for machining an NC lathe.

A bracket 8 is fixed to the slide shaft 1. Reference numeral 9 denotes a pneumatic cylinder fixed to the machine body so that the cylinder shaft extends in the axial direction of the machining chuck 6, the piston rod 9a of which is fixed to the bracket 8 to move a piston (not shown). Thus, the loader chuck 4 slides in the axial direction of the chuck for machining. A first pipe 11 is connected to the cylinder chamber (located on the left side in FIG. 1) that contracts when the loader chuck 4 approaches the processing chuck 6, and the other end of the first pipe 11 is connected to the atmosphere. It is open. On the contrary, a second pipe 12 is connected to the cylinder chamber on the side of expansion (located on the right side in FIG. 1), and the other end of the second pipe 12 is a pressurized air supply source such as a compressor (not shown). ) Are connected. Electromagnetic valves (not shown) are provided in the first pipe 11 and the second pipe 12, and the operation thereof supplies pressurized air to the cylinder chamber and exhausts air from the cylinder chamber. The solenoid valve, the loader chuck 4, the processing chuck 6 and the like are controlled by the controller 15. Further, the first pipe 11 is provided with an orifice having a predetermined inner diameter (for example, 2.4 mm) and a threshold sensor 14 as an exhaust gas detection device. The threshold sensor 14 detects a change in exhaust pressure, that is, a drop in exhaust pressure near the stroke end, and outputs an electric signal. Further, the second pipe 12 is provided with a pressure regulator 13 which maintains the pressure at a predetermined value. The output signal of the threshold sensor 14 is input to the controller 15. When an electric signal is input from the threshold sensor 14 to the controller 15, the solenoid valve is controlled to supply pressurized air to the expansion side cylinder chamber. In addition, while maintaining the state of exhausting from the contraction side cylinder chamber, it is controlled to immediately move to the next operation. The next operation is an operation of opening the loader chuck 4 and then closing the processing chuck 6 when moving in an unprocessed workpiece, and moving to a processing operation. On the other hand, when transferring out a processed workpiece. This is an operation of closing the loader chuck 4 and then opening the machining chuck 6 to clamp the machined work 7 with the claws 5, and carry out the machined work 7 from the machining machine.

Next, the operation of the above-described embodiment will be described. When the unmachined work is loaded, the unmachined work 7 is held by the loader chuck 4, and the pneumatic cylinder 9 operates to move the unmachined work 7 to the machining chuck 6. When approached, air is exhausted from the cylinder chamber to the first pipe 11. When the unmachined work 7 is pressed against the machining chuck 6, the exhaust pressure drops, an electric signal is output from the threshold sensor 14, the loader chuck 4 is opened by the control of the controller 15, and then the machining chuck 6 is opened. Closes and moves to processing work.

On the other hand, when the processed work is carried out, when the loader chuck 4 is brought closer to the processed work 7 by the operation of the pneumatic cylinder 9, air is exhausted from the cylinder chamber to the first pipe 11. When the loader chuck 4 is pressed against the processed work 7, the exhaust pressure drops, an electric signal is output from the threshold sensor 14, and the loader chuck 4 is closed by the control of the controller 15, and then the processing chuck 6 is opened. The processed work 7 is clamped by the claw 5.

Therefore, in both cases of carrying in an unmachined work and carrying out a machined work, both end faces of the work 7 are surely brought into contact with the loader chuck 4 and the machining chuck 6 and the pressure received by the work is received. Is properly managed, the work 7 can be held at the optimum position of the machining chuck 6 to improve the machining accuracy, and the work 7 can be clamped at the proper position of the loader chuck 4 and prevented from falling.

Further, since the orifice is provided in the first pipe 11 to adjust the flow rate, the drop in exhaust pressure by the threshold hold sensor 14 can be accurately detected. In that case, since an orifice with a constant inner diameter is provided, the need for individual flow rate adjustments, such as with a flow rate adjustment valve, is eliminated, and mass productivity is high.

In the above embodiment, when an air pressure signal is input from the threshold sensor 14 to the controller 15, the solenoid valve is controlled to supply pressurized air to the expansion side cylinder chamber and exhaust it from the contraction side cylinder chamber. However, when the electric signal is input, the solenoid valve may be controlled to close both cylinder chambers and immediately move to the next operation. Further, the pressure control of the cylinder chamber is not necessarily performed by the solenoid valve, but may be performed by other pressure adjusting means.

Further, although the threshold sensor 14 of the above embodiment outputs a signal when the exhaust pressure drops, it may detect the exhaust flow rate and output a signal when the exhaust flow rate drops. Further, although the threshold sensor 14 is shown as an example of the exhaust gas detection device, another type may be used as long as it detects a drop in exhaust gas pressure or exhaust gas flow rate and outputs a signal. Further, although the working machine is an NC lathe in the above-described embodiment, the present invention can be applied to a control device for a work passing machine that delivers a work to another type of working machine.

[0017]

[Effect of the device]

 As described above, the control device for the workpiece transfer machine of the present invention detects the fluctuation of the exhaust of the pneumatic cylinder that slides the loader chuck in the axial direction of the chuck for processing. Since it is possible to detect that the chuck has stopped, both end surfaces of the workpiece are in firm contact with the loader chuck and the machining chuck, and the pressure received by the workpiece is properly controlled to hold the workpiece at the optimum position of the machining chuck. The processing accuracy can be improved and the work can be clamped at the proper position of the loader chuck to prevent it from falling. In this case, the structure of the present invention is advantageous because there is no increase in the weight of the moving parts and there are no points of failure due to adhesion of cutting chips or cutting oil. Moreover, there is no need to adjust each part of the work delivery machine according to the work length, and the operation is simple.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment,

FIG. 2 is a side view of a main part showing a conventional example,

FIG. 3 is a side view showing another conventional example,

FIG. 4 is a view corresponding to FIG. 3 showing still another conventional example.

[Explanation of symbols]

 4 Loader chuck 6 Machining chuck 7 Workpiece 9 Pneumatic cylinder 14 Threshold sensor (exhaust gas detection device) Lo loader chuck 2 Machining chuck

Claims (1)

[Scope of utility model registration request] 1. A work transfer machine for holding a work by a loader chuck and delivering the work to and from the processing chuck of a processing machine, wherein the loader chuck is slid in the axial direction of the processing chuck by a pneumatic cylinder. In addition, when the loader chuck approaches the processing chuck, an exhaust detection device that communicates with the cylinder chamber on the exhaust side to detect fluctuations in exhaust gas is provided.