JP2567426B2 - Material feeding device of cutting machine - Google Patents

Description

Description: [Object of the Invention] (Field of Industrial Application) The present invention relates to a cutting machine, and more particularly to a material feeding device capable of accurately determining a cutting position of a workpiece. Is.

(Prior Art) A conventional material feeding device for a cutting machine includes a driving device 3 and a measuring device 5, as shown in FIG. 2, and the driving device 3 includes a pinch roller 9 and a driving roller 11. The measuring device 5 comprises a measuring roller 13 and a free roller 15.

The pinch roller 9 is vertically movable by a pneumatic cylinder 17. The measuring roller 13 is provided at the tip of an arm 19 rotatably provided on the shaft of the pinch roller 9, and is adjusted by a spring 21 so that the lower surface of the roller is slightly lower than the lower surface of the pinch roller 9. The measurement roller 13 has, for example, a rotary encoder or the like built therein, measures the feed distance of the workpiece W, and sends an operation signal to the drive roller 11 and the vise device 35.

When the workpiece W is supplied to the material feeding device, the workpiece W
Is sandwiched between the pinch roller 9 and the drive roller 11 of the drive device 3, and is sent to the right by the drive roller 11. Workpiece W
When the tip of the contact roller comes into contact with the measuring roller 13 of the measuring device 5, the measuring roller 13 rotates and measures the feed distance. When the workpiece W reaches the cutting position, the drive roller 11 is stopped by the signal from the measuring roller 13, and at the same time, the workpiece W is a vice device.
It is gripped and fixed to 35, positioned, and cut by a saw blade 41 (moves up and down as indicated by an arrow).

(Problems to be Solved by the Invention) As described above, in the conventional material feeding device, since the workpiece is fed at a considerable speed from the beginning to the end, even if there is a stop signal of the measuring device, the workpiece is not processed. Things do not stop immediately. For example, in the case of cutting the tip of a round bar, if the stop signal from the measuring roller is set 10 mm past the saw blade cutting position, the round bar will stop 20 mm further.
This is a big problem in terms of yield of the work piece. In addition, recently, there is a growing demand for directly taking a product without cutting the tip, and thus highly accurate positioning is required.

The present invention was made in view of such a problem, and it is possible to feed a work piece at a low speed immediately before positioning, thereby performing highly accurate positioning and improving the yield of the work piece. An object is to provide a material feeding device.

[Structure of the Invention] (Means for Solving Problems) In order to achieve the above-mentioned object, a material feeding device of the present invention includes a drive device for feeding a workpiece at high speed and a tip position of the workpiece. It is composed of a measuring device for measuring and issuing an operation signal, and a vise feeding device for gripping the workpiece immediately before the cutting position and sending it to the cutting position at a low speed in response to a command from the measuring device.

(Operation) With this configuration, the workpiece is sent at high speed by the driving device, and the tip position is sequentially measured by the measuring device. When the workpiece reaches the position just before the cutting position, the driving device is stopped by the command of the measuring device, the workpiece is gripped by the vise feeding device, and thereafter, the device is fed to the cutting position at a low speed. When the workpiece reaches the cutting position, the vise feeding device is immediately stopped by the command of the measuring device. In this way, since the workpiece is fast-forwarded and then positioned slowly, the positioning accuracy is significantly improved.

(Embodiment) Next, an embodiment of the present invention will be described with reference to FIG. As shown in the figure, the material feeding device 1 includes a driving device 3, a measuring device 5, and a feeding vise device 7. The structures of the driving device 3 and the measuring device 5 are the same as the conventional ones, and each of them comprises a pinch roller 9, a driving roller 11, a measuring roller 13, a free roller 15 and the like.

The pinch roller 9 is vertically movable by a pneumatic cylinder 17. The measuring roller 13 is provided at the tip of an arm 19 rotatably provided on the shaft of the pinch roller 9, and is adjusted by a spring 21 so that the lower surface of the roller is slightly lower than the lower surface of the pinch roller 9. The measuring roller 13 has a rotary encoder built therein, measures the feed distance of the workpiece, and sends an operation signal to the drive roller 11 and a feed vise device 7 described later.

The feeding vise device 7 includes a vise 25 for gripping or releasing the workpiece W by the hydraulic resin 23 based on a signal from the rotary encoder built in the measuring roller 13, and a vise 25 for moving the arrow forward and backward (arrow right). It consists of a hydraulic cylinder 27, etc. for slow feed, etc. Hydraulic cylinder
The forward, backward, and slow feed of 27 are performed by switching the electromagnetic switching valves 29, 31. A flow control valve 33 for slow feed is connected to the electromagnetic switching valve 31.

The vise device 35 holds (or releases) the workpiece W positioned by the material feeding device 1 of the present invention for cutting with the saw blade 41. The pneumatic cylinder 37 and the vise 39 are used.
Etc.

In this configuration, when the workpiece W is supplied onto the drive roller 11 of the drive device 3, the pinch roller 9 and the measuring roller 13 are lowered by the pneumatic cylinder 17 to press the workpiece W and simultaneously drive the drive roller 13 Rotates and sends the workpiece W to the right. Since the measuring roller 13 is slightly lower than the pinch roller 9 as described above, when the workpiece W passes, it is pushed up and rotated, and the built-in rotary encoder
The feed distance of the workpiece W is measured from directly below the measuring roller 13.

When the workpiece W reaches the cutting position, the measuring roller
The rotary encoder 13 sends a signal for holding the workpiece W to the feed vise device 7 and a stop signal for the drive roller 11 to the drive device 3. By this signal, the workpiece W is gripped by the vise 25 of the feed vise device 7 and stopped.

Next, the electromagnetic switching valve 29 (the neutral position in the figure) is excited to the forward direction, and the electromagnetic switching valve 31 (the fast feeding position in the figure) is excited to the slow feed, and the pressure oil is supplied from the hydraulic power source S to the hydraulic cylinder 27. Numeral 27 advances the work W with slow feed. When the workpiece W reaches the cutting position, the electromagnetic switching valves 29 and 31 are demagnetized by the length measurement completion signal from the measuring roller 13. As a result, the hydraulic cylinder 27 immediately stops, and the workpiece W also stops. The stopped work W is gripped by the vise device 35,
It is cut by a saw blade 41 (which moves up and down as shown by an arrow).

Since the workpiece W is fed at a low speed by the feeding vise device in this way, it can be stopped promptly by the command of the measuring roller 13. Therefore, the error in the cutting position is reduced. Further, since the high-speed feeding is performed before the low-speed feeding section, it is possible to increase the average feeding speed.

It should be noted that this embodiment is merely an example, and can be implemented in different modes. For example, the solenoid switching valve 29,3
1, the flow control valve 33 and the like may be collectively replaced with an electromagnetic proportional composite valve or the like.

[Effects of the Invention] As can be understood from the above description, since the present invention has the configuration described in the claims, the positioning accuracy of the cutting position of the workpiece becomes much higher than the conventional one, The yield of the work piece can be significantly improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of a material feeding device of the present invention, and FIG. 2 is an explanatory diagram of a conventional material feeding device. The same reference numerals in the drawings indicate the same or equivalent items. DESCRIPTION OF SYMBOLS REPRESENTING MAJOR PART OF DRAWING 1 ... Material feeding device, 3 ... Driving device 5 ... Measuring device, 7 ... Vise feeding device 11 ... Driving roller, 13 ... Measuring roller 25 ... Vise, 27 ... Hydraulic cylinder W ... Cover Workpiece

Claims (1)

(57) [Claims] 1. A drive device for feeding a workpiece at high speed, a measuring device for measuring a tip position of the workpiece and issuing an operation signal, and gripping the workpiece immediately before a cutting position according to a command from the measuring device, A material feeding device for a cutting machine, which includes a vise feeding device that feeds to a cutting position at a low speed.