KR200309518Y1 - A wire cutting machine which is able to control a position of a cutter using a servo motor - Google Patents

Abstract

The present invention relates to a wire cutter capable of controlling the position and speed of a cutter using a servo motor, which can be precisely controlled by a servo motor. To this end, in the electric wire cutter in which the speed of the electric wire 5 conveyed by the traction belt 36 is measured by the encoder 34, it is installed on the conveying path of the electric wire 5, A cutter 45 for cutting the electric wire 5; A servo motor 50 installed on the rotating body 44 to which the cutter 45 is fixed to control the rotation angle of the rotating body 44; A first proximity sensor 64 installed at the cutting speed start position P1 and a second proximity sensor 65 installed at the cutting speed end position P3 during the rotational movement of the rotating body 44; And the cutter 45 rotates at a cutting speed between the first proximity sensor 64 and the second proximity sensor 65 at a cutting speed based on the output signals of the proximity sensors 64 and 65, and other sections. And control means for controlling the servomotor 50 to rotate at a speed different from the cutting speed at SP2.

Description

A wire cutting machine which is able to control a position of a cutter using a servo motor}

The present invention relates to a wire cutter, and more particularly, to a wire cutter capable of controlling the position and speed of the cutter using a servo motor, the position of the rotation angle of the cutter for cutting the wire can be precisely controlled by the servo motor. .

In general, in order to produce electric wires, cord wires, etc. of electrical appliances and home appliances, the produced wires must be cut at regular lengths. It is a common electric wire cutter used at the time of such cutting | disconnection.

1 is a front view of a conventional wire cutter. As shown in FIG. 1, the electric wire 5 is continuously supplied through the tension pulley 8 driven by the DC motor from one side. The wire 5 to be transferred transmits a pulse signal to the control box 12 while passing between the pair of encoders 14, and counts the pulse signal of the control box 12 to cut the cutting module 18 at a predetermined timing. Operate once.

After passing through the encoder 14 in the tension pulley 8, the electric wire 5 is cut by a predetermined length by a cutter (not shown) installed in the cutting module 12 as soon as it passes through the towing belt 16. The cut wires 5 are stacked on the stacking table 19 in turn.

In such a conventional wire cutter 10, the cutting module 18 is equipped with a rotating cutter. Therefore, the electric wire 5 is cut by one rotation of the cutter. By the way, the cutting speed and the starting position of the cutter is important in order to cut the wire with the correct length. For this purpose, the clutch and the position sensor are used in the rotation of the cutter.

However, as the cutting process with the production speed of the product more than 100 meters per minute is repeated at high speeds of several tens to hundreds of times, minute cutting error (for example, deterioration and error due to the accumulated current and time constant of the clutch coil) ), The starting position of the cutter changes little by little. As these cutting errors continued to accumulate, the wires were cut to a length beyond the tolerance at some point. Since all the cut wires were treated as defective and reworked, even though the cutting process was automatic, the worker approached regularly (for example, every hundreds of times) to stop the device or lower the production speed.

Therefore, the present invention has been devised in view of the above problems, and the first object of the present invention is to precisely control the rotation angle position of the cutter by a servo motor, so that the cutting process is performed at a high speed (for example, several hundred times or more). It is to provide a wire cutter capable of controlling the position and the speed of the cutter using a servo motor that can be limited within a certain range without cutting errors accumulate even if repeated at a wire feed speed of 300 meters per minute).

The second object of the present invention is to divide the rotational speed of the cutter into two or more speeds, and by installing a proximity sensor at the starting position of each speed, using a servomotor that can control precise rotational speed as well as the position of the cutter. It is to provide a wire cutter capable of controlling the position and speed of the cutter.

The purpose of the present invention as described above, the DC motor (not shown) to automatically pull the wire 5, the wire 5 is conveyed by the traction belt 36 to automatically pull the wire by the DC motor An electric wire cutter whose speed is measured by an encoder (34), comprising: a cutter (45) installed on a conveying path of the electric wire (5) and cutting the electric wire (5) by a rotational movement; A servo motor 50 installed on the rotating body 44 to which the cutter 45 is fixed to control the rotation angle of the rotating body 44; A first proximity sensor 64 installed at the cutting speed start position P1 and a second proximity sensor 65 installed at the cutting speed end position P3 during the rotational movement of the rotating body 44; And the cutter 45 rotates at a cutting speed between the first proximity sensor 64 and the second proximity sensor 65 at a cutting speed based on the output signals of the proximity sensors 64 and 65, and other sections. Control means for controlling the servo motor 50 to rotate at a speed different from the cutting speed at (SP2) to be achieved by a wire cutter capable of controlling the position and speed of the cutter using the servomotor Can be.

And a reduction gear 56 installed between the servo motor 50 and the rotating body 44; Deceleration means connected to an input side of the deceleration gear 56 to decelerate a rotational speed at a predetermined rate; And a wire guide rod 48 connected to the output side of the deceleration means to guide the drop of the cut wire 5 to a predetermined position as it rotates.

In addition, the wire 5 may pass between the rotating body 44 and the idler 41, and a protective cover 43 may be further provided between the rotating body 44 and the idler 41.

In addition, the cutting speed of the cutter 45 is the same as the feed speed of the wire 5, the rotation speed of the SP2 section is more preferably a constant speed slower than the cutting speed.

Here, the coupling 61 is installed between the servo motor 50 and the rotating body 44; And a fixing member 62 through which the coupling 61 passes through the center region, and the guide groove 63 penetrates in the circumferential direction, wherein the first and second proximity sensors 64 and 65 are guided. Most preferably, it is fixed in the groove 63.

In addition, the feed speed of the wire 5 is 10 ~ 300 meters per minute, the diameter of the rotor 44 is 230mm ~ 270mm, the distance between the rotor 44 and the wire 5 is 10mm ~ 30mm It is appropriate that it is a range.

The angle between the cutting speed starting position P1 and the cutting speed ending position P3 of the rotating body 44 may be in the range of 70 ° to 100 °.

In addition, the wire 5 is most preferably a power line having a thickness of 2mm ~ 15mm range.

The present invention will become more apparent from the following detailed description and the preferred embodiments, in which the objects, specific advantages and novel features are associated with the accompanying drawings.

1 is a front view of a conventional wire cutter,

2 is a front view of a wire cutter capable of controlling the position and speed of a cutter using a servomotor according to the present invention;

3 is a partial front view of the cutting module of the wire cutter shown in FIG.

4 is a side view of the cutting module shown in FIG.

5 is a plan view of the cutting module shown in FIG.

6 is a graph showing the rotation angle of the cutter and the corresponding rotation speed in the wire cutter capable of controlling the position and speed of the cutter using the servomotor according to the present invention.

<Description of the symbols for the main parts of the drawings>

5: wire, 8: tension pulley, 10: wire cutter,

12: control box, 14: encoder, 16: towing belt,

18: cutting module, 19: lamination table, 30: wire cutting machine,

34: encoder, 36: towing belt, 38: tension pulley,

39: lamination table, 41: idler, 43: protective cover,

44: rotating body, 45: cutter, 46: reducer,

47: connecting belt, 48: wire guide rod, 49: guide rod rotating body,

50: servo motor, 51: feedback wire, 52: power wire,

54: reduction gear, 55: input side gear, 56: reduction gear,

60: shaft joint, 61: coupling, 62: fixing member,

63: guide groove, 64: first proximity sensor, 65: second proximity sensor,

70: Servo motor drive box, 90: control box, P1: cutting speed start point,

P2: Cutting point, P3: Cutting speed end point.

Hereinafter, with reference to the accompanying drawings with respect to the configuration of the wire cutter capable of controlling the position and speed of the cutter using the servomotor according to the present invention will be described in detail.

2 is a front view of a wire cutter capable of controlling the position and speed of the cutter using the servomotor according to the present invention. As shown in Figure 2, the wire cutter 30 of the present invention is approximately tension pulley 38, encoder 34, control box 90, towing belt 36, cutting module 40 and the stacking table ( 39) and a servomotor drive box 70.

The tension pulley 38 is a device for receiving the wire 5 completed and transferred in the previous process at a production speed.

The encoder 34 is installed downstream of the tension pulley 38 and consists of two pulleys, and the electric wire 5 passes between them to rotate the pulley by the frictional force. The encoder 34 is installed integrally with one of these pulleys and outputs a pulse signal as it rotates to transmit to the control box 90.

The control box 90 collectively controls the rotation and stoppage of the cutter for electrical control and cutting timing of the entire wire cutter 30, and the various states of the cutter 30 (for example, normal operation or abnormality). And the like through the flashing of the lamp.

Traction belt 36 is similar in construction to a pair of conveyor belts that are in contact with each other. The pair of towing belts 36 having a constant width are forcibly interviewed with each other to rotate, and the electric wire 5 passes therebetween. That is, the electric wire 5 is pulled forward by the friction force between the traction belt 36 and the electric wire 5.

The cutting module 40 is a configuration in which the cutting of the wire 5 is actually performed, and a servo motor, a reduction gear, a belt, a coupling (shaft joint), and the like are embedded therein, and a detailed internal configuration will be described later in the drawings. do.

The stacking table 39 is a holder on which the electric wires 5 cut to a predetermined length are stacked in an unfolded state. The wires 5 stacked in a certain number (for example, 50 units) on the loading table 39 are automatically bundled in bundles and packed by the worker.

The servo motor drive box 70 includes a PLC, a microcomputer, a relay, an I / O, a power supply, a status display LCD display, and the servo motor 50 at a predetermined position according to a pre-programmed command. It starts and stops at a designated position, and has a configuration to control each section to rotate at different accurate speeds.

In the control box 90, the linear velocity of the wire 5, the start of operation, the stop of operation, the number of cuts, the number of cuts, and the like are indicated by a lamp and a numerical display, and the necessary buttons are provided.

3 is a partial front view of the cutting module 40 of the wire cutter shown in FIG. As shown in FIG. 3, the cutter 45 protrudes by a predetermined length in the radial direction and is fixed on the rotating body 44 rotated by the servomotor 50. Therefore, the rotating body 44 and the cutter 45 rotate integrally with the rotation of the servomotor 50.

The idler 41 is installed adjacent to the lower side of the rotating body 44 and is rotatably installed. The idler 41 rotates as the cutter 45 cuts the wires 5 to support the bottom, and is rotated by a separate motor.

The diameter of the rotor 44 is 230mm ~ 270mm, the distance between the rotor 44 and the wire 5 is suitable in the range of 10mm ~ 30mm. In view of these dimensions, the protrusion length of the cutter 45 may be selected.

The protective cover 43 is installed between the rotating body 44 and the idler 41, and the inside of the protective cover 43 is empty so that the wire 5 can be passed through in the longitudinal direction. In addition, the cutter 45 is opened by a predetermined area on the rotating body 44 side and the idler 41 side so that the cutter 45 can enter and exit.

The reduction gear 46 is a device for transmitting a portion of power of the servomotor 50 to reduce a predetermined reduction ratio, and a connection belt 47 is connected to the reduced output side. This connecting belt 47 is configured to rotate the guide rod rotating body 49 for rotating the wire guide rod 48.

The electric wire guide rod 48 is a function of guiding the electric wire 5 which is cut and rotated so as to prevent the cut electric wire 5 from being thrown out or falling to an arbitrary position by slowly rotating the electric wire 5 to be placed at a designated position of the lamination table 39. Do it.

4 is a side view of the cutting module shown in FIG. As shown in FIG. 4, a power wire 52 is connected to a feedback wire 51 between the servo motor 50 and the servo motor drive box 70.

The servo motor 50 is connected to the rotating body 44 through the shaft coupling portion 60 with a built-in coupling. An input side gear 55 is provided on the input side of the reduction gear 46, and the reduction belt 54 is connected between the reduction gear 56 and the input side gear 55 in the shaft joint 60.

Since it is for deceleration, the size of the input side gear 55 is larger than that of the reduction gear 56, and the reduction gear 46 is configured not only to reduce the speed but also to convert the power by 90 degrees.

5 is a plan view of the cutting module shown in FIG. As shown in FIG. 5, the rotation shaft of the servomotor 50 is connected to the coupling 61, and is then integrally formed with the reduction gear 56 through the central area of the fixing member 62. Is connected to the whole 44.

The coupling 61 is a structure for connecting the shaft of the rotating body 44 and the shaft of the servomotor 50.

The fixing member 62 is a member for fixing the proximity sensors 64 and 65. The coupling 61 passes through the central region of the fixing member 62, and a circumferential guide groove 63 penetrates through the region passing therethrough.

The first proximity sensor 64 and the second proximity sensor 65 are installed at any angle on the guide groove 63, and the cutter 45 is installed on the non-exposed surface (exposed surface) of both surfaces of the rotating body 44. It is configured to measure the rotation angle of the).

The reduction gear 56 is integrally formed on the axis of the rotating shaft of the rotating body 44, and the reduction gear 56 is connected to the input side gear 55 of the reduction gear 46 by the reduction belt 54. The reduction gear 56 may be formed at an arbitrary position between the servo motor 50 and the rotating body 44.

6 is a graph showing the rotation angle of the cutter and the corresponding rotation speed in the wire cutter capable of controlling the position and speed of the cutter according to the present invention. As shown in FIG. 6, the cutter 45 of 360 ° of the rotating body 44 starts at the cutting speed at the P1 position, is actually cut at the P2 position, and the cutting speed is terminated at the P3 position. (SP1 angular distance). Then, the counterclockwise angular distance SP2 from the P3 position to the P1 position rotates at a constant speed. To this end, the first proximity sensor 64 is installed at the P3 position of the guide groove 63, and the second proximity sensor 65 is installed at the P1 position of the guide groove 63.

The rotating body 44 rotates to have the same linear speed as that of the wire 5 in the SP1 section, and travels at a lower speed than the SP1 section to return to the P1 position in the SP2 section. This low speed is usually selected from about 1/2 to 2/3 of the cutting speed. The reason for returning to the low speed is that when the rotor 44 approaches the P1 position and tries to stop, if the speed is high, an overshoot occurs and stops through the P1 position. Therefore, the SP2 section is allowed to travel at a constant speed and at a low speed.

It is preferable that the SP1 angle has a range of about 90 degrees symmetrically about the center line, but can be symmetrically adjusted in consideration of the thickness or the feeding speed of the wire 5 within a range of 70 ° to 100 °. For example, if the angle of SP1 is within 70 °, it is not enough to cut the 110V power line of minimum thickness, and if it is above 100 °, it consumes a lot of time in the SP1 section and requires high speed in the SP2 section, giving a burden to the device. There is a disadvantage that the maximum feed rate of (5) is limited to low.

Hereinafter, with reference to the accompanying drawings with respect to the operation of the wire cutter capable of controlling the position and speed of the cutter having the above configuration will be described in detail.

The wire 5 completed in the previous process passes through the pulley 38 is equipped with the encoder 34 via the tension pulley 38. At this time, while the pulley rotates by the friction force, the encoder 34 rotates together to output a predetermined pulse signal. The output pulse signal is transmitted to the servo motor drive box 70, and counts this to transmit the drive signal to the servo motor 50 at the cutting timing.

The drive of the servomotor 50 is coupled to the rotation of the reduction gear 56, the rotating body 44 and the cutter 45 via the coupling 61, and the rotation of the reduction gear 56 is guided with the reduction gear 46. This leads to the rotation of the rod rotor 49.

The servo motor 50 in which the cutter 45 is waiting at the P1 position receives the driving signal, and then rotates the P1 position-> P2 position-> P3 position at a constant cutting speed. Therefore, when the cutter 45 reaches the P2 position, the cutting is actually performed at the wire 5 sandwiched between the cutter 45 and the idler 41.

After cutting, the cutter 45 arriving at the P3 position is detected by the first proximity sensor 64 to rotate to the P1 position at a low speed and at a constant return speed. Upon arrival at the P1 position, it stops without overshooting each position by the detection of the second proximity sensor 65, and stays in the standby state for the next cutting.

Deceleration is performed while power is transmitted from the reduction gear 56 to the work force gear 55 by the reduction belt 54, and the reduction is made secondly in the reduction gear 46, and the connecting belt 47 and the guide rod are rotated. Deceleration takes place in three directions between the entirety 49. Therefore, the wire guide rod 48 rotates slowly with respect to the rapid rotation of the cutter 45.

The electric wire 5 cut | disconnected by the cutter 45 will collide obliquely with the electric wire guide rod 48, converging to the fixed place of the lamination table 39, as the cut | disconnected edge part falls. When the number of the cut wires 5 is 50, an automatic string wrapping machine (not shown) is operated to bundle the 50 wires 5 in a bundle.

The electric wire 5 used in the present invention is representative of a power line having a thickness of 2 mm to 15 mm, but when adjusting the rotational position and the rotation speed of the cutter, it can be used for cutting various wires such as communication lines, telephone lines, and wire cutting. .

In this embodiment, the feed rate of the wire 5 was 250 m per minute in the range of 220 to 300 meters per minute. When the feed rate is less than 220mpm, the productivity is too low, it takes too much time to produce a certain amount of wires, and when the feed rate is more than 300 mpm, process errors accumulate even when the servomotor is precisely controlled.

As described above, according to the wire cutting machine capable of controlling the position and speed of the cutter using the servomotor according to the present invention, the cutting angle is precisely controlled by the servomotor, so that the cutting process may be repeated hundreds of times at high speed. Cutting errors do not accumulate, there is an advantage that can be limited within a certain range (up to 8mm).

In addition, it has the ability to achieve a minimum cutting length of about 20 cm.

In addition, by dividing the rotational speed of the cutter into two or more speeds, by installing a proximity sensor at the start position of each speed, precise control of the rotational speed as well as the position of the cutter can be made.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, various other modifications and variations may be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the appended utility model registration claims is intended to include such modifications and variations as fall within the true scope of the present invention.

Claims (8)

In the electric wire cutter in which the speed of the electric wire 5 conveyed by the towing belt 36 is measured by the encoder 34, A cutter 45 installed on a transfer path of the wire 5 to cut the wire 5 by a rotational movement; A servo motor 50 installed on the rotating body 44 to which the cutter 45 is fixed to control the rotation angle of the rotating body 44; A first proximity sensor 64 installed at the cutting speed start position P1 and a second proximity sensor 65 installed at the cutting speed end position P3 during the rotational movement of the rotating body 44; And The cutter 45 rotates at a cutting speed between the first proximity sensor 64 and the second proximity sensor 65 at SP1 based on the output signals of the proximity sensors 64 and 65, and the rest of the section ( Control means for controlling the servo motor to rotate at a speed different from the cutting speed in SP2); Wire cutters capable of controlling the position and speed of the cutter using a servomotor. The method of claim 1, A reduction gear 56 installed between the servo motor 50 and the rotating body 44; Deceleration means connected to an input side of the deceleration gear 56 to decelerate a rotational speed at a predetermined rate; And Is connected to the output side of the deceleration means, the wire guide bar 48 for guiding the fall of the cut wire (5) as it rotates to a predetermined position; position and speed of the cutter using a servomotor further comprises Wire cutters with control. The electric wire of claim 1, wherein the electric wire 5 passes between the rotating body 44 and the idler 41, Wire cutters capable of controlling the position and speed of the cutter using a servomotor, characterized in that the protective cover 43 is further provided between the rotating body 44 and the idler 41. The cutting speed of the cutter 45 is the same as the feed speed of the wire 5, The rotation speed of the SP2 section is a wire cutter capable of controlling the position and speed of the cutter using a servomotor, characterized in that the constant speed is slower than the cutting speed. According to claim 1, Coupling (61) provided between the servo motor (50) and the rotating body (44); And The coupling 61 passes through the central region, and further includes a fixing member 62 through which the guide groove 63 in the circumferential direction, The first and second proximity sensors (64, 65) are wire cutters capable of controlling the position and speed of the cutter using a servomotor, characterized in that fixed in the guide groove (63). The method according to any one of claims 1 to 5, The feed rate of the wire 5 is 220 ~ 300 meters per minute, The diameter of the rotating body 44 is 230mm ~ 270mm, The distance between the rotor 44 and the wire (5) is a wire cutter capable of controlling the position and speed of the cutter using a servo motor, characterized in that the range of 10mm ~ 30mm. The position of the cutter using the servomotor according to claim 1, wherein the angle between the cutting speed start position P1 and the cutting speed end position P3 of the rotating body 44 is in the range of 70 ° to 100 °. And wire cutters with speed control. 2. The wire cutter according to claim 1, wherein the wire (5) is a power line having a thickness of 2 mm to 15 mm.