KR20010038276A - a heater-coil winding machine for electron gun - Google Patents

Abstract

PURPOSE: A heater winder for electron gun is provided to improve greatly quality, productivity and reliability of heater for electron gun by winding tungsten wire with uniform pitch at molybdenum wire in order to agree correctly with set pitch value. CONSTITUTION: A molybdenum wire supply motor(23) loose molybdenum wire(M) in a proper tension being equipped with supply reel that molybdenum wire(M) is wound. A winding motor(33) winds reel(24) in a proper tension being equipped with reel that molybdenum wire(M) that tungsten wire(T) is wound, is wound. A tungsten wire winding unit(30) is installed between molybdenum wire supply motor(23) and heater coil winding motor(60), winds tungsten wire peripheral of molybdenum wire(M) equipping with tungsten bobbin. A pitch transfer unit(40) transfer molybdenum wire in a predetermined pitch speed. A winding reel shaking unit(50) reciprocates heater coil winding motor(60) in an axis direction so that heater coil is wound uniformly on winding reel. Controller control above each components. A short sensing device make a sense short of molybdenum wire and is connected with controller.

Description

A heater-coil winding machine for electron gun}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of heaters used in electron guns of cathode ray tubes, and more particularly to winding tungsten wires to form heaters on molybdenum wires at desired pitches. It relates to a heater coil winding machine.

As is well known, the cathode ray tube is an image display device that implements an image by landing an electron beam emitted from an electron gun on a fluorescent surface of a screen. Therefore, the performance of the electron gun is very important. The electron gun emits electrons by heating a cathode coated with an electron-emitting material with a heater, and concentrates the emitted electrons by an electrostatic lens formed between a plurality of electrodes to form a beam. Acceleration by the high voltage applied impinges on the fluorescent surface. Therefore, in order to realize a clear image, the electron emission from the cathode must be uniform, which is entirely determined by the heating value distribution of the heater.

On the other hand, since the heater used for the electron gun is very small in size, it is usually configured in the form of a coil (coil) in order to obtain a sufficient heat generation required for electron emission. That is, after winding the tungsten wire on the molybdenum wire at the required pitch interval, it is cut to a certain length, formed into the required shape, and then sintered by applying an insulating film and a graphite film thereon, followed by dissolving and removing the molybdenum wire with a solution. It is manufactured by. Therefore, in order for the heater to have a uniform heating distribution as a whole, the winding pitch of the heater coil must be uniformly formed. In the manufacture of the heater for the electron gun, the winding of the tungsten wire to the molybdenum wire is important.

To this end, conventionally, a bobbin in which tungsten wire is wound is coaxially mounted on a main shaft to rotate at a predetermined rotational speed, and an intermediate part of a molybdenum wire connected to a winding reel penetrating through the main shaft from a supply reel is servo motor. It is wound around a pitch drum driven by the motor and transported at a constant speed corresponding to the set pitch.

However, since the conventional winding machine is a tracking control method using a servo motor, a serious problem may occur in that the winding pitch of the tungsten wire becomes uneven when a voltage change occurs due to an external factor. That is, when the voltage change occurs, the rotation speed of the main shaft and the pitch drum becomes larger or smaller than the set rotation speed.The servo motor automatically returns the speed of the changed pitch drum to the set value, so the relative feed speed of the pitch drum with respect to the rotation speed of the main shaft By shifting, the winding pitch of the tungsten wire becomes uneven.

In addition, an appropriate tension is provided between the supply reel and the winding reel to precisely transport the molybdenum wire, and the molybdenum wire has an extremely fine diameter, so that it is easily disconnected even with a small external force. Accordingly, the conventional winding machine is equipped with a sensor on the main shaft to detect the disconnection of the wire, which detects the disconnection of the fine molybdenum wire by the contact or the detection light, so there is a risk of malfunction, and also the accuracy of the disconnection detection is reduced. do. As a result, even if a disconnection did not occur, the reliability of the device could not be guaranteed, such as stopping the operation of the device or continuing the operation even when the disconnection occurred.

The present invention was completed in view of the above-mentioned conventional problems, and an electron gun heater winding machine capable of winding a tungsten wire at a uniform pitch on a molybdenum wire so as to exactly match a set pitch value regardless of external factors such as voltage fluctuations. The purpose is to provide.

Another object of the present invention is to provide a heater winding machine for an electron gun that can minimize the occurrence of loss of work by quickly and precisely detecting a disconnection of a wire that can be generated during operation without malfunction.

1 is an excerpt perspective view showing a heater winding machine for an electron gun according to the present invention;

2 is a front view of FIG. 1,

3 is a plan view of FIG.

4 is a perspective view taken along the IV of FIG.

5 is a perspective view taken along the line V of FIG.

6 is a front view taken along the VI of FIG.

FIG. 7 is a plan view of FIG. 6.

<Explanation of symbols for main parts of drawing>

20: molybdenum wire supply unit

23: supply motor 24: guide reel

30: tungsten wire winding unit

32: spindle 32b: nozzle (of spindle)

33: winding motor 35: winding guide

37: Slant pole (of winding guide) 39: Guide rod (of winding guide)

40: pitch feed unit

43: pitch drum 44: stepping motor

45: reducer 47: encoder

50: swing unit

51: worm 52: worm wheel

53: cam 55: rocking block

57: guide rod 59: compression coil spring

60: heater coil winding unit 70: disconnection detection cable

SR: Molybdenum wire feed reel TR: Heater coil winding reel

M: Molybdenum Wire T: Tungsten Wire

In order to achieve the above objects, the heater winding machine for an electron gun according to the present invention includes a molybdenum wire supply motor for releasing molybdenum wire to a suitable tension by mounting a supply reel in which molybdenum wire is wound; A heater coil winding motor which mounts a winding reel in which the molybdenum wire wound around the tungsten wire is wound and winds the coil in an appropriate tension; A tungsten wire winding unit installed between the molybdenum wire supply motor and the heater coil winding motor to mount a tungsten bobbin to wind the tungsten wire on the outer circumference of the molybdenum wire; A pitch feed unit for feeding molybdenum wire at a required pitch speed; A winding reel swing unit configured to reciprocate the heater coil winding motor in an axial direction such that the heater coil is uniformly wound on the winding reel; A controller for controlling each of the above elements; And disconnection detecting means connected to the controller and detecting disconnection of the molybdenum wire.

According to one preferred feature of the present invention, the tungsten wire winding unit includes a main shaft through which the molybdenum wire penetrates in the axial direction and coaxially mounts the tungsten bobbin, a winding motor for driving the main shaft at a required rotational speed, and It is composed of a winding guide mounted on the tip to guide the tungsten wire to the molybdenum wire.

According to another preferred feature of the invention, the pitch transfer unit, the pitch drum, the heater coil is wound at least once, the encoder (encoder) connected to the winding motor so as to detect the rotational speed of the main shaft, and the pitch drum A stepping motor rotates at a required pitch speed and is driven in synchronization with the encoder detection signal, and a speed reducer for decelerating the power of the stepping motor and transmitting it to the pitch drum.

According to still another preferred feature of the present invention, the disconnection detecting means comprises a closed circuit between the molybdenum wire and the controller through respective components, and includes at least one of an alarm buzzer and an alarm lamp for alarming the disconnection.

Accordingly, the present invention, the molybdenum so that the tungsten wire to exactly match the set pitch value because the pitch drum is driven in synchronization with the change in the rotation speed of the main shaft even if the voltage fluctuations caused by external factors during operation, the rotation of the main shaft changes from the set value The wire can be wound at a uniform pitch, and wire breakage can be detected quickly and precisely.

Such specific features and other advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

1 to 3, the heater winding machine for the electron gun according to the present invention is equipped with a molybdenum wire supply unit 20 for supplying molybdenum wire (M) with a suitable tension by mounting a supply reel (SR) wound around the molybdenum wire, molybdenum It takes the tungsten wire winding unit 30 for winding the tungsten wire T at the required pitch interval on the outer circumference of the wire M, and the heater coil C in which the tungsten wire T is wound on the molybdenum wire M. A heater coil winding unit (60) for winding the heater coil (C) with a suitable tension by attaching a pitch transfer unit (40) for transferring at a pitch speed of the coil, and a winding reel (TR) on which the heater coil (C) is wound; Winding reel swing unit 50 for reciprocating the heater coil winding unit 60 in its axial direction so that the heater coil (C) is uniformly wound around the winding reel (TR), and each of the above units (20 ~ 60) Body frame 10 with a built-in controller (not shown) to control and Consists of a disconnection detection means for detecting disconnection of the emitter coil (C).

Molybdenum wire supply unit 20 is installed on the body frame 10 through a bracket (bracket: 21) and is connected coaxially with the shaft 22, which supports the supply reel (SR) mounting It consists of a supply motor 23 for rotating the supply reel (SR). Preferably, the supply motor 23 is composed of a tension motor so that the molybdenum wire (M) to be conveyed maintains a proper tension, and the tension adjusting knob (23a) that can properly adjust the tension applied to the molybdenum wire (M) It is provided together. The tension adjusting knob 23a adjusts the tension by slightly changing the voltage applied to the tension motor. On the other hand, the guide reel (24) for guiding the molybdenum wire (M) released from the supply reel (SR) on the body frame 10 to one side of the supply reel (SR) can be transported in alignment with the winding unit (30) It is installed through this bracket 25.

The heater coil winding unit 60 is installed on the body frame 10 through the bracket 61, and is provided with a shaft 62 for mounting and supporting the winding reel TR. The heater coil winding unit 60 is coaxially connected to the shaft 62 to be wound. It consists of a winding motor 63 which rotates TR. The winding motor 63 is also composed of a tension motor to maintain a suitable tension on the molybdenum wire (M), it is provided with a tension adjusting knob (63a) that can appropriately adjust the tension.

The tungsten wire winding unit 30 is hollow so that the molybdenum wire M can penetrate in the axial direction and rotatably supports the main shaft 32 and the main shaft 32 for coaxially mounting the tungsten bobbin B. And the tungsten wire T is attached to the distal end of the molybdenum wire M so that the headstock 31, the winding motor 33 for driving the spindle 32 at a required rotational speed, and the tip end portion of the spindle 32 are mounted. Winding guide 35 for guiding the winding and the nozzle 32b coupled to the tip of the main shaft 32 to support the molybdenum wire (M) in an aligned state.

The main shaft 32 has a driven pulley 32a at one end thereof, as shown in FIG. 4, and is connected to the driving pulley 33a of the winding motor 33 and the electric belt 34, which is the main shaft 32. ) Rotates thousands of RPM at high speed, so the transmission belt 34 is preferably configured with a timing belt to prevent slip during driving.

As shown in FIG. 5, the winding guide 35 is provided with a circular support plate 36 fixed to the main shaft 32 and a periphery of the support plate 36 so that the tungsten wire T is molybdenum wire M. As shown in FIG. Slant pole (37) to form a winding path on the tungsten wire (T) so that it can be wound) and a fixed lever 38 for fixing the tungsten bobbin (B) on the main shaft (32). A guide roller 37a is provided between the tungsten bobbin B and the slant pole 37, and the winding of the tungsten wire T to the molybdenum wire M is preferable on one side of the slant pole 37. An approximately articulated guide rod 39 is provided for guiding this.

The pitch transfer unit 40 is connected to the winding drum 33 and the pitch drum 43 for winding the heater coils C several times so as not to overlap each other and transferring them at the required pitch interval. Stepping motor 44 which rotates the encoder 47 to detect, the pitch drum 43 at a required pitch speed, and decelerates the power of the stepping motor 44 to a predetermined reduction ratio and transmits it to the pitch drum 43 It consists of a reducer 45.

The pitch drum 43 is mounted to the shaft 42 rotatably installed on the bracket 41, and on one side thereof, a guide reel for guiding the heater coil C to be transferred to the winding reel TR in an aligned state ( 46 is also installed on the bracket 41.

The encoder 47 is composed of, for example, 1000 PPR, and includes a driven pulley 47a on its rotating shaft and is connected to the driving pulley 33a of the winding motor 33 and the electric belt 48. The transmission belt 48 is also preferably configured as a timing belt to prevent slip during driving. The encoder 47 is connected to the controller and transmits the detected rotational speed of the main shaft 32 to the controller. In addition, the stepping motor 44 is driven only by an angle corresponding to a pulse puls input therefrom in synchronization with the signal of the encoder 47 transmitted from the controller.

6 and 7, the swing unit 50 to be wound is a worm 51 integrally formed on the shaft 42 of the pitch transfer unit 40 and a worm wheel meshed with the worm 51. (52), a cam (53) electrically connected to the worm wheel (52), and a swing block (55) which reciprocates in contact with the main surface of the cam (53). Cam 53 is provided with a driven pulley (53a) coaxially connected to the drive pulley (52a) coaxially provided on the worm wheel 52 and the electric belt 54, this electric belt 54 also prevents slip To the timing belt. The rocking block 55 is movably coupled to the guide rods 57 at which both ends are fixed to two support blocks 56 spaced apart from each other on the body frame 10, the upper portion of the rocking block 55. The heater coil winding unit 60 is mounted. On one side of the swing block 55, a bracket 58a having a contact roller 58 in rolling contact with the main surface of the cam 53 is fixedly installed. And between the rocking block 55 and the support block 56 in the rear is provided a compression coil spring 59 for elastically biasing the rocking block 55 to the rear.

On the other hand, the disconnection detection means is made by configuring an electrical closed circuit between the molybdenum wire (M) and the controller through each unit (10 ~ 60). That is, as shown in FIG. 3, one of the sensing cables 70 connected to the controller is connected to the bracket 25 of the molybdenum wire supply unit 20, and the other is connected to the body frame 10. . To this end, for example, the molybdenum wire supply unit 20 and the tungsten wire winding unit 30 are electrically isolated from the body frame 10. In addition, the disconnection detecting means preferably includes an alarm buzzer 71 and an alarm lamp 72 connected to the closed circuit so that the disconnection can be quickly alerted to the outside.

The remaining reference numeral 11 is an operation panel of the body frame 10.

Next, the operation of the heater winding machine for the electron gun according to the present invention configured as described above will be described.

First, the tungsten bobbin B on which the tungsten wire T is wound is mounted on the main shaft 32 and fixed, and the supply reel SR on which the molybdenum wire M is wound is mounted on the shaft 22 of the supply unit 20. Mount on. Next, the winding reel TR is mounted on the shaft 62 of the winding unit 60, the molybdenum wire M is released from the supply reel SR, and the guide reel 24 and the main shaft 32 are passed through the pitch. It is connected to the winding reel TR via the guide reel 46 in the state which wound up the drum 43 several times.

In this state, power up the instrument and set the controller to the value you want to work with. Then, one side of the molybdenum wire M is turned on to apply tension to the supply and take-up motors 23 and 63 by turning on a tension switch (not shown), and then the tension adjusting knobs 23a of the respective motors 23 and 63. ) 63a is operated to maintain a proper tension on the molybdenum wire (M).

Next, the position of the guide rod 39 of the winding guide 35 is adjusted to the optimum state, and the tungsten wire T is hooked on the guide roller 37a and the slant pole 37 to set the guide rod 39. Hold the tungsten wire (T) and start the machine.

Then, the motors 23, 33, 44, and 63 are driven so that the molybdenum wire M is transferred to the winding unit 60 to the supply unit 20 and the molybdenum wire to which the tungsten wire T is transferred ( After winding at a pitch interval set on the outer circumference of M), it is wound around the winding reel TR.

That is, when the winding motor 33 is driven, the main shaft 32 connected to the electric belt 34 is rotated, and thus the winding guide 35 is rotated together, so that the tungsten wire T rotates in the slant pole. Unwinding from the bobbin B by the 37 and the guide rod 39 is wound on the molybdenum wire (M). At the same time, the pitch drum 43 is rotated at the set speed by the stepping motor 44, thereby transferring the molybdenum wire M by the set pitch interval. At this time, the rotational speed of the main shaft 32 is detected by the encoder 47 connected to the winding motor 33 and the electric belt 34 and transmitted to the controller, the controller is a stepping motor (stepping the signal input from the encoder 47) 44). Then, the stepping motor 44 is driven only by the angle corresponding to the number of pulse signals fed back from the encoder 47, so that the tungsten wire (T) is wound around the molybdenum wire (M) at a constant pitch interval. Therefore, even if voltage fluctuation occurs due to external factors during operation and the rotation speed of the main shaft 32 changes, the stepping motor 44 is driven in synchronization with the pulse signal fed back from the encoder 47 so that the tungsten wire T is always uniformly pitched. Can be wound.

For example, if the pitch of the tungsten wire T is to be wound at 90 μm, assuming that the circumferential length of the pitch drum 43 is 281.3 mm and the reduction ratio is 21: 1, the controller 144 (281.3 / 21 × 1) Set the dispensing. Then, since the encoder 47 has 1000 pulses, about 7 pulse signals per one revolution of the main shaft 32 are transmitted to the stepping motor 44, and the stepping motor 44 is driven by only this number of pulse signals. Therefore, when the rotational speed of the main shaft 32 is changed by the voltage variation, the speed of the stepping motor 44 is added or reduced correspondingly, so that the tungsten wire T is wound at a uniform pitch interval.

At this time, the worm wheel 52 engaged with the worm 51 formed on the shaft 42 of the pitch transfer unit 40 rotates together, and the cam 53 connected to the electric belt 54 rotates at the same time. do. Then, the swing block 55 is reciprocated in a predetermined stroke by the contact roller 58 and the compression coil spring 59 contacted with the outer circumference of the cam 53 to swing the reel TR in the axial direction. As a result, the heater coil C having the tungsten wire T wound around the molybdenum wire M may be uniformly wound without overlapping the winding reel TR.

On the other hand, if disconnection occurs in the heater coil C during such an operation, an open signal is input to the controller constituting the electrical closed circuit, and the controller immediately stops each unit 20 to 60. At the same time, the alarm buzzer 71 and the alarm lamp 72 are operated to alert the disconnection, which can entail prompt action.

As described above, according to the present invention, the pitch drum for transporting the molybdenum wire is driven in synchronization with the rotational speed of the main shaft. Thus, even if the rotational speed of the main shaft changes from the set value, The molybdenum wire can be wound at a uniform pitch to exactly match the set pitch value. In addition, since the controller is composed of an electrically closed circuit together with molybdenum wire, when a break occurs, the breakage can be detected very quickly and precisely, thereby minimizing work loss.

Therefore, the present invention has a very excellent effect that can greatly improve the quality, productivity and reliability of the heater for the electron gun.

Claims (7)

A molybdenum wire supply motor for mounting a supply reel in which molybdenum wire is wound to release the molybdenum wire to a proper tension; A heater coil winding motor which mounts a winding reel in which the molybdenum wire wound around the tungsten wire is wound and winds the coil in an appropriate tension; A tungsten wire winding unit installed between the molybdenum wire supply motor and the heater coil winding motor to mount a tungsten bobbin to wind the tungsten wire on the outer circumference of the molybdenum wire; A pitch transfer unit for transferring the molybdenum wire at a required pitch speed; A winding reel swing unit which reciprocates the heater coil winding motor in an axial direction such that the heater coil is wound around the winding reel uniformly; A controller for controlling each of the elements; And And a disconnection detecting means connected to the controller and detecting disconnection of the molybdenum wire. The heater winding machine according to claim 1, wherein the molybdenum wire supply motor and the heater coil take-up motor are constituted by a tension motor, and each of the adjusting knobs for appropriately adjusting the tension of the molybdenum wire is provided. 2. The tungsten wire winding unit according to claim 1, wherein the tungsten wire winding unit comprises: a main shaft through which the molybdenum wire penetrates in the axial direction and coaxially mounts the tungsten bobbin; a winding motor for driving the main shaft at a required rotational speed; And a winding guide mounted on the tip and configured to guide the tungsten wire to the molybdenum wire. The method of claim 1, wherein the pitch transfer unit comprises: a pitch drum in which the heater coil is wound at least once, an encoder that is electrically connected to the winding motor to detect the rotational speed of the main shaft, and the pitch drum And a stepping motor which rotates at a pitch speed and is driven in synchronization with a detection signal of the encoder, and a reducer which decelerates the power of the stepping motor and transmits the power to the pitch drum. According to claim 1, wherein the swing unit is to be wound, the worm is coaxially connected to the output shaft of the reducer, the worm wheel to be engaged with the worm, a cam that is electrically connected to the worm wheel, and the winding unit is mounted And a swing block having a contact roller elastically biased backward to have a contact roller in contact with the outer circumference of the cam, and a pair of guide rods to which the swing block is movably coupled. The heater winding machine of claim 1, wherein the disconnection detecting unit comprises an electrical closed circuit between the molybdenum wire and a controller through the respective components. The heater winding machine for an electron gun according to claim 6, further comprising at least one of an alarm buzzer and an alarm lamp for alarming the disconnection of the molybdenum wire.