KR0183597B1 - A testing jig for drum motor of the head drum assembly - Google Patents

Abstract

According to the present invention, the drum jig 200 is rotatably fixed by supporting the lower and upper parts by inserting the drum motor 200 into the shaft 170 so that the inspection jig can be stably driven as if the drum motor 200 is assembled to the actual head drum assembly. It is to provide.

According to the present invention, the drum 140 is crimped from the upper side of the fixing part 140 rotatably fixing the drum motor 200 and the drum motor 200 installed in the fixing part 140 to prevent the flow of the drum motor 200. Compression unit 180, and the support portion 110 for supporting the fixing portion 140 and the compression unit 180 from the bottom.

The present invention rotates the drum motor 200 in the same condition as the actual assembly state of the drum motor 200 in the head drum assembly to accurately determine whether the defect before the drum motor 200 is coupled to the head drum assembly by making a poor manufacturing The drum motor 200 is prevented from being assembled to the head drum assembly.

Description

Drum Motor Inspection Jig of Head Drum Assembly

The present invention relates to an inspection jig for inspecting the drum motor installed in the head drum assembly, and in particular, to prevent the drum motor from escaping up and down and to the left and right, and to rotatably fix the drum under the same conditions as coupled to the head drum assembly. A drum motor inspection jig of a head drum assembly for inspecting the functional characteristics of a motor.

In general, the head drum assembly is installed in a traveling system of a video cassette recorder to drive a video tape to its outer circumferential surface, thereby reproducing a video signal recorded on a video tape or converting an input video signal into a video tape. Is a device for recording on.

As shown in FIG. 1, the head drum assembly includes an upper drum 10, a lower drum 20, and a drum motor 50. The drum motor is formed by a shaft 30 installed through a central portion of the drum. The driving force of 50 is transmitted to the upper drum 10. Among them, a plurality of heads 12 are installed on the bottom of the upper drum 10 so as to protrude to the outer circumferential surface, and a rotary transformer rotor 40 electrically connected to the heads 12 is fixedly installed below the center. In addition, the lower drum 20 forms a constant gap with the rotary transformer rotor 40, and a rotary transformer stator 42 is installed, and the flexible PC 48 is electrically connected to the rotary transformer stator 42. It is connected to a preamp that amplifies the current.

The upper drum 10 of the head drum assembly having such a configuration is fixed to the shaft 30 so that the drum 12 rotates together with the shaft 30 when the drum motor 50 is driven, and the head 12 is the upper drum 10. Picks up a magnetic force line generated from the video tape in contact with the outer circumferential surface of the sensor and transmits a magnetic signal to the rotary transformer rotor 40, or transfers an electrical signal transmitted from the rotary transformer rotor 40 from the head 12 to the leakage magnetic field. Create and magnetize your videotape.

On the other hand, the structure of the drum motor 50 for rotating the shaft 30 is, as shown in Figure 2, the shaft (30) is fitted in the center and the magnet 62 alternately in the inner and peripheral poles and the S pole is A stator 52 having a rotor 60 provided thereon, a main electrode 54 with coils wound around an annular iron core, and a staple pole 56 formed between the main poles 54, and the stator 52 It consists of a PC 51 provided with a connection terminal 57 provided on the bottom surface and connected to a preamplifier and a Hall element 58 for detecting the position and phase of the main electrode 54.

When a power source and an electric signal are transmitted to the PC 51 of the drum motor 50 through the connection terminal 57, and a current is applied to the coil wound around the main electrode 54 of the stator 52, the main electrode 54 at the main electrode 54. The generated magnetic flux is connected with the magnetic flux of the magnet 62 installed in the rotor 60 to generate a rotational force.

The two Hall elements 58 attached to the stator 52 and having a phase difference of 180 degrees detect the magnetic pole position, the polarity, and the phase of the magnet 62. At this time, if the polarity of the magnet 62 is the negative pole and the magnetic field of the coil of the main electrode 54 to which the current is applied is formed as the negative pole, the rotor 60 rotates about the shaft 30 by mutual repulsive force. When the position of the magnet 62 corresponds to the main electrode 54 formed of the S pole by the rotation of the electron 60, another Hall element 58 having a 180 degree phase difference detects the magnetic pole position and the polarity and instantly switches to the negative pole. The rotor 60 is continuously rotated. That is, the hall element 58 attached to the stator 52 operates as a sensor for continuously rotating the rotor 60 by detecting the position and phase of the main electrode 54.

Accordingly, the rotor 60 rotates together with the shaft 30 to rotate the upper drum 10 fitted to the shaft 30.

In addition, the magnet 60 protruding outward is attached to the outside of the rotor 60, and the magnetic sensor 59 capable of detecting the magnetic force of the magnet 64 is installed in the PCB, so that the rotor ( While the 60 is rotating, the magnetic sensor 59 detects the rotation of the rotor 60 and transmits the electrical signal to the microcomputer through the connection terminal 57. Accordingly, the microcomputer calculates the rotational speed of the rotor 60 and transmits a signal to the PCB 51 again when the rotational speed is out of the reference value, thereby adjusting the rotational speed of the drum motor 50 to the reference value.

The drum motor 50 is separately manufactured and assembled to complete a single piece, and then fitted to the head drum assembly by fitting to the shaft. At this time, if the coil wound on the rotor 60 of the drum motor 50 is disconnected or a short is generated, when the coil is coupled to the head drum assembly without inspection, the head drum assembly is completed. The entire head drum assembly that is rejected and finished the assembly process is treated badly, resulting in a large loss of parts and work. The same result is obtained when the function of the drum motor 50 deviates from the reference value.

Therefore, the drum motor 50 connects the power supply and inspection device to the connection terminal 57 of the PCB 51 and applies current to the magnetic element before the coupling to the head drum assembly. From the rotational speed of the drum motor 50 measured in (59), the disconnection and short generation of the coil and the function should be tested to sort out the poorly manufactured drum motor 50.

However, in order to perform such a test, the power supply and inspection apparatus must be connected to the PC 51 of the drum motor 50, and the drum motor 50 must be driven under the same condition as the state of being assembled to the head drum assembly. There was a problem that it is very difficult to drive the motor 50 stably.

The present invention has been made to solve the above problems, the technical problem of the present invention, the shaft is inserted into the drum motor and supported from the lower and upper, stable under the same conditions as the drum motor is coupled to the head drum assembly It is to provide a drum motor inspection jig of the head drum assembly capable of driving.

The technical problem as described above is an inspection jig for rotatably fixing the drum motor in order to measure the assembly state and the output specifications of the drum motor installed in the head drum assembly, and a fixing part for rotatably fixing the drum motor at the bottom; A drum motor inspection jig of a head drum assembly, comprising: a crimping part which is crimped on the upper side of the drum motor installed in the fixing part to prevent the flow of the drum motor, and a supporting part which supports the fixing part and the crimping part at the bottom. By providing.

1 is an exploded perspective view of a conventional head drum assembly.

2 is an exploded perspective view showing a drum motor of a conventional head drum assembly.

Figure 3 is an exploded perspective view showing a test jig according to the present invention.

Figure 4 is a perspective view of the support according to the invention.

5 is a cross-sectional view showing an inspection jig according to the present invention.

* Explanation of symbols for main parts of the drawings

110: support portion 112: upper plate

114: bottom plate 116: connecting shaft

119: adsorption member 120: adsorber

122: suction pipe 124: switch

126: suction valve 140: fixed part

142: housing 144: bearing

146: adsorption hole 147: bolt

148: center hole 149: bolt hole

150: adsorption plate 152: pin ball

154: fixed pin 170: shaft

171: protrusion groove 172: rotor fixing part

173: second pin hole 174: second fixing pin

176: preload boss 178: balance

180: crimping portion 182: first cover

184: second cover 186: third cover

188: elastic projection 190: protrusion

192: spring 200: drum motor

210: Pcsbee 212: Rotor

220: power supply and inspection device

3 is a perspective view showing an inspection jig according to the present invention, Figure 5 is a cross-sectional view showing the inspection jig according to the present invention, the drum motor inspection jig of the head drum assembly according to the present invention, the bottom surface of the drum motor 200 Fixed part 140 to be rotatably fixed at the upper part, a drum motor 200 installed at the fixed part 140, and a crimping part 180 to prevent flow by pressing the upper part, and the fixing part 140 and crimping. Consists of the support portion 110 for supporting the portion 180 from the bottom, each having the following features.

The fixing part 140 is installed on the upper side of the support 110 and has a shape spanning while being fitted into the shaft 170 for rotating the drum motor 200 and the center hole 148 formed in the support 110. A housing 142 in which a bearing 144 for rotating the shaft 170 is installed, a suction plate 150 provided above the housing 142 to support the drum motor 200 from the bottom, and a drum motor. It consists of an adsorption member 119 for fixing the 200 to the adsorption plate 150.

In addition, the adsorption member 110, as shown in Figure 4, the adsorber 120 for generating a separate suction force, a switch 124 connected to the adsorber 120 to block the suction force, and the switch The drum motor 200 through a plurality of suction valves 126 connected to the 124 to create a vacuum therein, and suction holes 146 connected to the suction valve 126 and formed in the fixing part 140. Adsorption pipe (122) of the bottom of the adsorption pipe (122) is fixed to the adsorption plate (150).

In place of the adsorption method, other fixing methods may be provided within the range of fixing the PC 210.

A plurality of bolt holes 149 are formed in the support part 110, the housing 142, and the suction plate 150, and the bolts 147 fitted into the bolt holes 149 are attracted to the housing 142. The plate 150 is fixed to the support 110.

The lower side is fitted to the plurality of pin holes 152 formed on the adsorption plate 150 and the upper side is fitted to the pin holes 152 formed on the PCB 210 of the drum motor 200 to prevent the PC 210 from flowing. The fixing pin 154 is provided.

The lower part is fitted into the plurality of second pin holes 173 formed in the rotor fixing part 172 of the shaft 170, and the upper part is fitted into the second pin hole 173 formed in the rotor 212. A second fixing pin 174 is provided in which 212 rotates integrally with the shaft 170.

The preload boss 176, which applies a preload to the bearing 144, is fastened to the bottom of the shaft 170 by the bolt 147.

The balancer 178 is screwed to the bottom of the shaft 170 to replace the weight of the head drum assembly in which the drum motor 200 is installed.

The support 110 has a top surface 112 with a horizontal surface, a bottom plate 114 having the same size as the top plate 112, and the top plate 112 and the bottom plate 114 at regular intervals. It consists of a plurality of connecting shaft 116 to be fixed.

The crimping unit 180 is fitted to the first cover 182 fitted to the shaft 170 and the outside of the first cover 182 to support the rotor 212 of the drum motor 200 from above. A second cover 184 and a third cover 186 inserted into the first cover 182 to apply elasticity to the second cover 184.

In addition, a plurality of elastic protrusions 188 are installed inside the third cover 186 to be inserted into the protrusion holes 190 formed on the first cover 182 and detached to the protrusion grooves 171 formed on the shaft 170. Insert it as much as possible.

A plurality of springs 192 are installed between the second cover 184 and the third cover 186 to elastically support the second cover 184.

The assembly process of such inspection jig will be described.

First, the center plate 148, the plurality of adsorption holes 146, and the fastening holes are formed in the upper plate 112, and the upper plate 112 is horizontal to fix the lower plate 114 to the connecting shaft 116. To complete the support 110. In this case, the connecting shaft 116 may be coupled by a bolt 147 or a welding method.

And the adsorber 120 is provided separately, and the switch 124 which cuts off the suction force of the pipe connected to this adsorber 120 is installed in place of the support part 110. FIG. The suction valve 126 connected to the pipe is installed in a plurality of places of the support 110 and connected to the suction pipe 122.

Next, the housing 142 having the bearing 144 installed therein is inserted into the center hole 148 of the upper plate 112 so that the upper portion thereof covers the upper plate 112. Then, the adsorption plate 150 is raised on the housing 142, the upper plate 112 and the bolt hole 149 formed in the housing 142 and the adsorption plate 150 coincide with each other, and then fastened with a bolt 147. The housing 142 and the adsorption plate 150 are fixed to the top plate 112. In addition, the fixing pin 154 is inserted into the pin hole 152 formed on the suction plate 150.

Then, the suction pipe 122 is inserted into the suction hole 146 formed in the upper plate 112 and the housing 142 and the suction plate 150 so that the inlet is directed upward.

Next, the shaft 170 is inserted into the hole of the shaft 170 formed in the suction plate 150 and inserted into the bearing 144 of the housing 142. Then, the preload boss 176 is inserted into the shaft 170 to apply pressure at the bottom of the bearing 144, and then the hexagon bolt is rotated with a hexagon wrench to fix the shaft 170 firmly. Therefore, the bearing 144 is prevented its own minute flow by the preload boss 176.

Then, the balancer 178 is screwed to the end of the shaft 170 by rotating.

The operation of the inspection jig assembled as described above will be described.

First, the PCB 210 in which the stator 212 of the drum motor 200 is installed is inserted into the shaft 170. Then, the second fixing pin 174 is inserted into the second pin hole 173 formed in the rotor 212 fixing part 172 of the shaft 170, and the rotor 212 provided with the magnet is mounted on the shaft 170. The second fixing pin 174 is inserted into the second pin hole 173 formed in the rotor 212 to cover the rotor 212.

Next, the elastic protrusion 188 installed inside the third cover 186 by inserting the second cover 184 into the first cover 182 and inserting the third cover 186 into the first cover 182. Is fitted into the protrusion 190 of the first cover 182. A spring 192 is installed between the second cover 184 and the third cover 186 to allow the second cover 184 to be elastically supported by the spring 192.

Next, the first cover 182 into which the second cover 184 and the third cover 186 are fitted is fitted to the shaft 170. In this case, the elastic protrusion 188 protruding from the protrusion 190 of the first cover 182 is fitted into the protrusion groove 171 formed in the shaft 170. Accordingly, the first cover 182 is fixed to the shaft 170 by the elastic protrusion 188, the second cover 184 elastically supports the upper portion of the rotor 212 of the drum motor 200 and the shaft 170 will be supported from the bottom.

In this state, the power supply and inspection apparatus 220 is connected to the connection terminal provided in the PC 210 of the drum motor 200.

When the assembly of the inspection jig is completed as described above, the adsorber 120 is operated and the switch 124 installed on the support 110 is opened to apply a suction force to the adsorption valve 126 to the drum motor 200 by the suction pipe 122. Of the PCB 210 is adsorbed and compressed to the adsorption plate 150.

Then, when the power is supplied to the connection terminal of the PC 210 by operating the power supply and inspection device 220, a current flows in the coil wound on the main electrode of the rotor 212, the magnetic flux generated at this main electrode And the rotor 212 is continuously rotated by the attraction force and the repulsive force generated by the polarity of the magnetic flux generated in the magnet installed in the rotor 212.

At this time, since the shaft 170 is fixed to the rotor 212 by the second fixing pin 174, it is rotated integrally with the rotor 212. In addition, since the shaft 170 is fitted to the bearing 144 installed in the housing 142, the shaft 170 can be rotated almost without friction, and a balancer 178 is installed at the bottom of the shaft 170 so that the drum motor 200 has a head drum. Instead of the weight of the head drum assembly when installed in the assembly, the rotational speed of the drum motor 200 is the same as when installed in the head drum assembly.

In addition, the first cover 182, the second cover 184, and the third cover 186 supporting the upper portion of the drum motor 200 also rotate together with the shaft 170. Accordingly, the PCB 210 and the stator of the drum motor 200 are fixed to the suction plate 150 by the suction pipe 122, and the rotor 212 rotates integrally with the shaft 170 and the crimping unit 180. Done.

In this state, the magnetic sensor installed in the PCB 210 of the drum motor 200 senses the rotational speed of the rotor 212 from the magnetic flux of the projection magnet installed in the rotor 212 through the connection terminal of the PC 210. Deliver to inspection device.

The inspection apparatus compares the input voltage with the number of revolutions of the rotor 212 and the like, and determines the disconnection of the coil of the drum motor 200, the occurrence of a short, an error in function, and the like, and selects the defective drum motor 200.

After the inspection of one drum motor 200 in accordance with the completion of the above process, by closing the switch 124 to remove the suction force of the intake valve 126 so that the suction pipe 122 is separated from the PCB 210 . Then, the third cover 186 is lifted upward to remove the first cover 182 and the second cover 184 from the shaft 170. At this time, the third cover 186 is provided with an elastic protrusion 188 to elastically escape from the protrusion groove 171 of the shaft 170, the third cover 186, the first cover 182 and the second cover ( 184 may exit the shaft 170.

Then, the power supply and inspection device 220 connected to the connection terminal of the PC 210 is separated.

Then, another drum motor 200 is inspected in the same manner as above.

The present invention is a test jig for rotatably fixing the drum motor 200 in order to inspect the disconnection and short generation or function of the drum motor 200, such as a state in which the drum motor 200 is actually assembled to the head drum assembly. Since the drum motor 200 is stably rotated under the conditions, it is possible to accurately select whether the drum motor 200 is defective by the power supply and inspection device 220, and thus the defective manufactured drum motor 200 is assembled to the head drum assembly. There is an effect that can prevent the entire head drum assembly is poorly processed.

Claims (12)

In a test jig for rotatably fixing the drum motor 200 to measure the assembly state and output specifications of the drum motor 200 installed in the head drum assembly, the drum motor 200 is rotatably fixed on the bottom surface. The fixing unit 140 and the drum motor 200 installed at the fixing unit 140 to squeeze the upper side to prevent the flow, and the fixing unit 140 and the pressing unit 180. Drum motor inspection jig of the head drum assembly, characterized in that consisting of a support 110 for supporting at the bottom. According to claim 1, wherein the fixing portion 140 is installed on the upper side of the support 110, the shaft 170 for rotating the drum motor 200, and fitted in the center hole 148 formed in the support 110. A housing 142 having a shape that is stretched over the inside and having a bearing 144 for rotating the shaft 170 therein; and an adsorption plate installed at an upper side of the housing 142 to support the drum motor 200 from the bottom thereof. And a suction member (119) for fixing the drum motor (200) to the suction plate (150). 3. The adsorption member (119) according to claim 2, wherein the adsorption member (119) includes an adsorber (120) for generating a suction force that is separately installed, a switch (124) connected to the adsorber (120) to block suction force, and the switch (124). PCs 210 of the drum motor 200 through a plurality of suction valves 126 connected to create a vacuum therein, and suction holes 146 connected to the suction valves 126 and formed in the fixing part 140. The drum motor inspection jig of the head drum assembly, characterized in that the adsorption pipe 122 is fixed to the adsorption plate 150 by adsorbing the bottom surface. According to claim 2, The support portion 110, the housing 142 and the suction plate 150 is formed with a plurality of bolt holes 149, by the bolt 147 fitted into the bolt hole 149 Drum motor inspection jig of the head drum assembly, characterized in that the housing 142 and the suction plate 150 is fixed to the support (110). According to claim 2, the lower side is fitted into the plurality of pin holes 152 formed in the adsorption plate 150, the upper side is fitted into the pin hole 152 formed in the PCB 210 of the drum motor 200, the PC ratio 210 Drum motor inspection jig of the head drum assembly, characterized in that the fixing pin 154 is provided to prevent the flow. The lower portion of the second pin hole 173 formed in the rotor fixing part 172 of the shaft 170 and the upper portion of the second pin hole 173 formed in the rotor 212. Drum motor inspection jig of the head drum assembly, characterized in that the rotor is provided with a second fixing pin (174) to rotate integrally with the shaft (170). 3. The drum motor inspection jig according to claim 2, wherein a preload boss (176) for applying a preload to the bearing (144) is fastened by bolts (147) on the bottom surface of the shaft (170). 3. The drum motor inspection jig of the head drum assembly of claim 2, wherein a balancer (178), which replaces the weight of the head drum assembly in which the drum motor (200) is installed, is screwed to the bottom of the shaft (170). According to claim 1, wherein the support 110 is a top plate 112, a horizontal plane is formed, a bottom plate 114 having the same size as the top plate 112, the top plate 112 and the bottom plate ( Drum motor inspection jig of the head drum assembly, characterized in that composed of a plurality of connecting shafts (116) for fixing the 114 at regular intervals. 2. The rotor 212 of claim 1, wherein the crimping unit 180 is fitted to the shaft 170, and the rotor 212 of the drum motor 200 is fitted to the outside of the first cover 182. ) And a second cover 184 supporting the upper side, and a third cover 186 fitted to the first cover 182 to apply elasticity to the second cover 184. Motor inspection jig. The protrusion of claim 10, wherein a plurality of elastic protrusions 188 are installed in the third cover 186 to fit into the protrusions 190 formed in the first cover 182, and the protrusions formed in the shaft 170. Drum motor inspection jig of the head drum assembly, characterized in that inserted in the groove 171 detachably. The head of claim 10, wherein a plurality of springs 192 are installed between the second cover 184 and the third cover 186 to elastically support the second cover 184. Drum motor inspection jig of the drum assembly.