JPS6043242B2 - Material control equipment for automatic machine tools - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is an automatic machine tool that processes a long and thin material, such as an automatic forging machine, in which the material is supplied as a workpiece of a predetermined length. Regarding material control devices for machines,
In particular, there is a material cutting device that is installed at a cutting position and repeatedly processes a long and thin material to create a workpiece of a predetermined length, a gripping device that transports the cut workpiece to an automatic machine tool, and a gripping device that carries the cut workpiece to an automatic machine tool. A type of automatic machining system that includes a material feed device that intermittently feeds elongated materials of equal length to a cutting position, and a control device that controls the operation of a gripping device and, when the gripping device is inactive, ejects the workpiece. Relating to material control devices for machines.

(Prior Art) J Automatic machine tools include hot forging machines, cold forming machines, automatic screw making machines, press machines, etc. that process metal bars or wires.

Automatic machine tools receive workpieces of a predetermined length and perform predetermined processing using processing or forming tools.
If the supplied work piece does not have the predetermined dimensions, not only will the desired product not be obtained, but there is also a risk of damage to the machine.

Generally, in the case of long and slender materials such as bars and wires, there are areas near both ends that are dimensionally and structurally uneven, and when the workpieces cut from these areas are fed to an automatic machine tool, the problems described above occur. It is known to eject several workpieces near each end and prevent them from being fed into an automatic machine tool due to malfunctions. U.S. Patent No. 32895
No. 08 discloses a material control device for an automatic machine tool of the type mentioned above.

(Problems to be Solved by the Invention) In U.S. Pat. No. 3,289,508, the cutting operation is started by sensing the passage of the front end of a certain length of material,
The gripping device is deactivated until a predetermined number of cutting operations are completed, and the ejecting is performed, then the gripping device is activated during a predetermined number of cutting operations, and the gripping device is turned on again after the predetermined number of cutting operations are completed. As it is inactive, it causes it to pop out,
There is a problem in that the adjustment must be changed depending on the length of the material and the length of the workpiece.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a material control device that does not require readjustment when changing the length of the work piece and the length of the material.

(Means for Solving the Problems) According to the present invention, there is provided a material cutting device which is installed at a cutting position and performs repeated cutting operations on a long and thin material in order to produce a workpiece of a predetermined length; a gripping device that transports the workpiece to an automatic machine tool;
A material feeding device that intermittently feeds the elongated material by lengths equal to the predetermined length to a cutting position and a gripping device are operated. and a control device for ejecting a workpiece when the control device is inactive, the control device for a material control device for an automatic machine tool of the type comprising: a control device for ejecting a workpiece when the control device is inactive; a sensing device located at a remote control position to sense passage of the front end and rear end of the elongated material at the control position and generate detection signals respectively; A measuring device that measures the amount of movement of the elongated material immediately after passing through the material and outputs this amount of movement in the form of a pulse signal that is emitted every fixed amount of movement unrelated to the predetermined length. A counter is provided that starts counting pulse signals in response to a detection signal emitted when the passage of the front end is detected, and when the counter counts a predetermined number of pulse signals, the gripping device is activated and the sensing device is placed after the elongated material. A material control device for an automatic machine tool is provided, including a control mechanism that disables a gripping device in response to a sensing signal sensing the passage of an edge.

A sensing device for sensing the passing of the front and rear edges of the material is preferably a device for applying a load in a direction transverse to the direction of travel of the material, a supporting device for preventing the material from deflecting in the lateral direction, and a device for applying a load in a direction transverse to the direction of travel of the material, and a supporting device for preventing the material from deflecting in the lateral direction. and a detection device for detecting deviation in the direction 7 and detecting engagement of the material with the load applying device.

This can mechanically detect the passage of the edge of the material, is not affected by heat, rust, etc., and is highly reliable compared to optical or radiation sensing devices. It is cheap and sturdy. Embodiment In the illustrated embodiment, an elongate material 10 is pulled by powered feed rollers 11 (material feed device) through a heater device 12 and fed to a material cutting device (cutter device) 13 .

The cutter device 13 has an ivy member 16 that can reciprocate in the direction of an arrow 17, and a stationary cutter device that cuts the material when the cutter member moves forward (moves diagonally downward to the left in FIG. 1) in cooperation with the cutter member 16. A cutter member (indicated by a chain line in FIG. 1) is included. In the figure, the chain line circle indicates a through hole for attaching a tool provided in a stationary cutter member, and the material 10 is inserted into the through hole.
A tool (not shown) with an inner diameter that closely corresponds to the outer diameter of
is attached and cooperates with the vine member 16. The positional relationship between the material 10 and this circle is not shown correctly. At the retracted position of the cutter member (the solid line position shown in the figure), the workpiece 10 is sent by the feed roller 11, and its front end (lower right end in Figure 1) determines the length of the workpiece 14 to be cut. It comes into contact with a gauge (not shown) for The feed roller 11 operates intermittently to feed the material 10 only when the cutter member 16 is in the retracted position. Note that although the length of the cut piece 14 is shown to be extremely short in the figure, the actual ratio is not shown. The cut work piece 14 is transported to a position (not shown) for further processing.

A gripping device 18 is provided which grips the workpiece during the cutting operation and grips the workpiece as it is conveyed for tightening. When the gripping device 18 is activated, that is, when it is not operating normally, the work piece 14 is not sent for the pulling SX process, and is therefore ejected from the production line. In general, a material of a certain length is often uneven in terms of material, dimensions, etc. near both ends, so workpieces cut from these parts must be carefully protected so that they are not sent for the SX process. It is necessary to make an offer. It is usually sufficient to eject a few workpieces from the front and rear ends of the blank. Between the feed roller 11 and the heater device 12 there is a sensing and measuring device 19 .

There is a sensing and measuring device 19 . Sensing and measuring device 1
Reference numeral 9 denotes a roller 24 for support and movement measurement that is supported by a shaft 26 and rotates;
It includes a load roller 27 and a sensing roller 34. The load roller 27 is rotatably supported by an arm 28 of an arm shaft 29 supported by a pivot shaft 31, and is pressed in a direction toward the roller 24 by a spring 30 acting on another arm of the arm shaft 29. It is preferable that the load roller 27 has a groove in the shape of a square square as shown in the figure. The roller 24 is cylindrical and its rotational movement is not affected by the diameter of the material 10. Axis 2 of roller 24
A pulse generator 32 is connected to 6 and generates a pulse every time the shaft 26 rotates by a predetermined angle. In the preferred embodiment, pulse generator 32 pulses 150 pulses per revolution of shaft 26.
The roller 24 has a diameter of approximately 8.99c7.
7! (3.5 inches). Therefore, the material 10 is about 1.
One pulse is generated every 86 wfL (approximately 0.073 inches) of movement. Note that the roller 27 prevents slippage between the material 10 and the roller 24. The sensing roller 34 is rotatably supported by an arm 36 of an arm shaft 37 rotatably supported by a shaft 38, and is pressed against the material 10 by a spring 39. When the rear end of the material 10 passes the roller 24, the material 1
0 is moved downward by the pressing force of the roller 34 (the position indicated by the chain line in FIG. 1), and the sensing roller 34 also swings around the shaft 38 and moves downward (see FIG. 2). This movement is caused by switch 41,
42 , and a signal is sent to the control mechanism (control circuit) 23 via a conductor 47 . Note that the control mechanism 23 is also connected to the pulse generator 32 by a conductive wire 33.
A pulse signal from the pulse generator 32 is supplied to a counter (not shown) within the control mechanism 23.

During normal operation, as shown in FIG. 2, when the rear end 49 of one material 10 passes through the rollers 24 and 27 and the sensing roller 34 is lowered, the front end of the next material 10 is brought into contact with the rear end 49. The amount of descent of the roller 34 is relatively small, and the engagement between the two materials 10 does not come off.

When the next material 10 advances further from the position shown in FIG. 2, the sensing roller 34 returns to its original position. When the roller 34 is returned to the solid line position in FIG. 1 by the leading edge 48 of the next material, the switches 41 and 42 return to the position shown in FIG. Start. The number of pulses counted by the counter is 1
represents the length of the material that has moved through the control position since the time when the front end of the material passed through the control position. The aforementioned feed roller 11 is arranged in front of the sensing and measuring device 19;
In the illustrated embodiment, this is shown as two pairs of longitudinally spaced rollers (the rear one being shown as 43, 44), with an auxiliary sensor 22 located between both pairs of rollers.

The auxiliary sensor 22 is a S
This detects when the front end of the material is not being fed.
A block 66 provided on a lever 68 under the force of a spring 67 is pressed laterally against the material 10 and is in sliding contact. If the material 10 is not present, the lever 68 swings clockwise in FIG. Movement is switch 69, conductor 71
is detected by the control mechanism 23 via. Roller 4 of the pair of rollers 43 and 44 behind the feed roller 11
4 is subjected to a force toward the opposing roller 43 by an actuator 65 operated, for example, by hydraulic pressure.

When the material 10 is not fed by the pull S, that is, when there is no material at the position of the rollers 43 and 44, the roller 4
Since there is a risk that the front end of the new material will not smoothly enter between the rollers 43 and 44 due to the spacing between the rollers 43 and 44 being too small, the actuator 65 is connected to the control mechanism 23 by a conductive wire 65a, and the new material is After the front end 48 (FIG. 2) returns the roller 34 to the solid line position in FIG. 1, when a predetermined number of pulses are detected, the actuator 65 is actuated to move the roller 44 to the broken line position in FIG. Note that after the front end of the material has surely passed the positions of the rollers 43 and 44, the roller 4
4 takes the normal position, that is, the pressing position toward the roller 43. The material gripping device 18 includes a lever 5 that is swingably provided around a shaft 51 on the cutter member 16 that reciprocates.
0, and the cutter member 1 is configured as one end of the lever 50.
6 to grip the material during cutting, and during normal operation, release the grip at the most advanced position of the cutter member 16 and send the cut workpiece 14 to the next process (not shown) (this position is called the transfer position). When it is necessary to release the cutter member 16 at the rearmost position (this position is called the release position) without releasing it at the destination position (this position is called the release position). 1), a roller 53 provided at the other end of the lever 50, a spring 52 that applies a pressing force to the lever 50 in the counterclockwise direction in FIG. It includes an actuator 59 and a track member 54 that engages with the roller 53 and transmits the operation of the actuator 58 to the lever 58 when the roller 53 reciprocates as the cutter member 16 reciprocates.

Track member 54 is shown as a lever that swings about axis 57. In the above description, the transfer position is the forwardmost position of the cutter member 16, and the spring-out position is the backward position of the cutter member 16, but the reverse may be possible. Actuator 5 at the normal gripping position shown
When the piston rod 59 of No. 8 is in the retracted position, the lever 50 grips the workpiece by the force of the spring 52. Ru. When the actuator 58 is actuated by operating the valve 61, the piston rod 59 extends, the lever 50 swings clockwise in FIG. 1 against the spring 52, and the grip is released. Valve 6
1 is connected to the control device 23 via a conductor 62. The operation of the illustrated embodiment is as follows.

In order to simplify the explanation, it is assumed that the gripping device 18 is inactive when ejecting the workpiece, and operates normally when the cut workpiece is transferred for the next processing. Of course, it is necessary to release the workpiece for transfer, and it is desirable to perform cutting while gripping, so gripping and releasing are related to the respective operations of cutting, transferring, and ejecting. It is something that is done. Generally speaking, in the illustrated embodiment, a length of material 10 is intermittently fed to a material cutting device 13 by feed rollers 11 of a material feeding device, the material cutting device cutting each time from the front end of the material. A workpiece 14 of a predetermined length is cut, and the cut workpiece 14 is transferred to an SX processing position (not shown) where it is pulled by a gripping device 18.

The amount of movement of the material is measured as the number of pulses by a measuring device (measuring roller 24, pulse generator 32), and the control mechanism 23
The number of pulses is determined independently of the length of the workpiece to be cut. When the trailing end 49 of a length of material passes the control position (measuring roller 24), this movement is sensed by the sensing roller 34 and a signal is provided from the sensing switch 41 to the control mechanism 23. When the sensing roller 34 senses that the trailing edge 49 of the workpiece 10 has passed the control position, the gripping device 18 is released and the cut workpiece is no longer sent to the transfer position.

As a result, a plurality of workpieces cut from the rear end of the material are pushed out, and workpieces with defective dimensions or materials are prevented from being sent to the SX processing position. . Note that this may be performed immediately after sensing by the sensing roller 34, or an appropriate delay circuit may be provided within the control mechanism 23 to delay the ejecting operation. In this specification,
The ejecting operation is performed by deactivating the gripping device 18, and the operation of transferring the cut workpiece to the next processing step is performed by bringing the gripping device 18 into the normal operating state. However, this is not directly related to releasing and gripping the workpiece.

In other words, it is necessary to release the grip in order to transfer the workpiece, and it is clear that the ejection position does not need to be limited to the cutting position of the workpiece.Furthermore, when cutting the workpiece, It is also widely practiced to restrain the part of the material to be cut using some kind of device, and in the illustrated embodiment, the ejecting action and the transporting action of the work piece to the next process are the same as cutting. In connection with the operation of the device 13, the timing of the gripping and/or releasing movements of the gripping device is controlled to be different. Normally, as shown in FIG.
passes through rollers 24, 27, and 28.

The counter of the control mechanism 23 is reset by the passage of the rear end 49 of the material, and the counter starts accumulating the number of pulses by the passage of the front end 48 of the material. At this time, as described above, the gripping device 18 is given an inactivation command, but this continues until the material advances a predetermined distance (a predetermined number of pulses) after the front end 48 of the material has passed. If the distance between the sensing and measuring device 19 and the cutting device 13 is set to a first predetermined length, the sum of the lengths of the work pieces cut and ejected from the rear end of the material is smaller than the first predetermined length. It is.

Also, the predetermined distance by which the next material advances until the gripping device 18 is commanded to operate normally after the leading edge 48 of the next material passes the sensing and measuring device 19 is greater than the first predetermined length. . Workpiece 14 cut in FIG.
Although the ratio of the first predetermined length to the first predetermined length is shown as 15 or more, in reality, it is sufficient that only a few pieces of workpiece are projected from each end. When S is pulled to the rear end of one material and the front end of the next material is not fed, the control mechanism 23 detects this and stops the device after performing a predetermined number of feeding and cutting operations. let

The gripping device 18 is maintained in a non-operating or inactive state.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of the material control device according to the present invention, and FIG. 2 is an operational explanatory diagram showing a partial side view thereof. 10...Material, 11...Material feeding device (
feed roller), 13...Material cutting device, 14...
...Processed piece, 16...Cutter member, 18.
... Gripping device, 19 ... Sensing and measuring device, 21 ... Auxiliary roller, 22 ... Auxiliary sensor, 23 ... Control mechanism, 24 ...・・・・・・
Measuring roller, 32...Pulse generator, 34.
...Sensing roller, 41, 42...Switch,
4 no 3, 44...roller, 58...actuator.

Claims (1)

[Claims] 1 A material cutting device installed at a cutting position to perform repeated cutting operations on a long and thin material in order to create a workpiece of a predetermined length; a gripping device for transporting the cut workpiece to an automatic machine tool; An automatic machine tool comprising a material feeding device that intermittently feeds the elongated material in equal lengths to a cutting position, and a control device that controls the operation of a gripping device and causes the workpiece to be ejected when the gripping device is not activated. In the material control device for, the control device is located at a control position separated by a predetermined distance from the cutting position within the course of the elongated material, and senses passage of a front end and a rear end of the elongated material at the control position, respectively. a sensing device for generating a detection signal; and a sensing device provided at a control position to measure the amount of movement of the elongated material immediately after the front end of the elongated material passes the control position, and to determine the amount of movement independent of the predetermined length. A measuring device outputs in the form of a pulse signal every fixed amount of movement, and a counter that starts counting the pulse signals in response to a detection signal generated when the sensing device senses the passing of the front end of the elongated material, and the counter and a control mechanism for activating the gripping device when a number of pulse signals are counted and deactivating the gripping device in response to a detection signal that detects passage of the trailing end of the elongated material by a sensing device. Material control device for machines.