• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a cleaning apparatus for a video head that removes foreign matter accumulated in the video head to keep the video head clean. In the present invention, the cleaner 15 is operatively installed at the tip of the bimetal 11, and one end of the bimetal 11 is fixed to the lower drum 32. When the head drum assembly 30 is operated, the head is caused by frictional heat generated between the upper drum 34 and the tape and frictional heat generated between the shaft 36 of the head drum assembly 30 and the bearing 37. The cleaning device 10 is bent because the metal 11a having a large thermal expansion coefficient close to the drum assembly 30 extends more than the metal 11b having a small thermal expansion coefficient. As a result, the cleaner 15, which is in contact with the video head 38 at the beginning of driving, is separated from the video head 38 to stop the cleaning operation.
    公开号:KR19980059058A
    申请号:KR1019960078394
    申请日:1996-12-30
    公开日:1998-10-07
    发明作者:조부현
    申请人:배순훈；대우전자 주식회사；
    IPC主号:
    专利说明:

    V-Cal video head cleaning device
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head drum assembly of a video tape recorder (hereinafter abbreviated as' V'al), and more particularly to cleaning a video head to remove foreign matter accumulated in the video head to keep the video head clean. Relates to a device.
    In general, V-C is composed of a traveling system for moving the tape along a predetermined path, and a drive system including a feed reel, a winding reel, etc. for supporting the tape cassette and transferring the tape in a selected direction.
    Referring to FIG. 1, the odometer is provided with a head drum assembly 30 including a video head 38 which rotates in contact with a tape drawn from a tape cassette and records or reproduces a signal recorded on the tape. have. The head drum assembly 30 is composed of a lower drum 32 fixed to the main base 1 and an upper drum 34 rotatably fixed to the lower drum 32 by the main shaft 36. The head 38 is fixedly attached to the upper drum 34 which rotates at high speed, so that the head 38 rotates together with the upper drum 34. The videohead 38 is of high precision and contacts the tape and reads or records the signal, so it must always be kept clean to obtain good image quality. That is, when foreign matters and the like adhere to the video head 38, the signal scanning ability of the tape is not only sharply lowered, but also a problem occurs that damages the tape. Therefore, maintaining the cleanness of the video head becomes essential.
    Therefore, in the related art, as shown in FIG. 1, the support member 51 having the support shaft 51a and the fixing protrusion 51b is inserted on the main base 1 on one side of the head drum assembly 30. Outsert: A cleaning apparatus 50 is provided, which is fixed to the support member 51 and provided with a cleaner 54 at its tip. The support part 52 is rotatably supported with respect to the support shaft 51a, and an elastic lever 55 which is integrally extended to the support part 52 on one side of the support part 52 and is caught by the fixing protrusion 51b to provide elasticity. ) Is located. In addition, a cleaning lever 53 extending from the support portion 52 to the head drum assembly 30 and having the above-described cleaner 54 fixed to the head drum assembly 30 is provided, and the cleaning lever 53 and the support portion (ie, to have a predetermined elasticity). 52 is narrowly formed.
    On the other hand, on the opposite side of the support portion 52, the operating lever 56 and the support portion 52 so as to interfere with the guide roller (4) installed in the pole base (3) moving along the guide rail (2) on the main base (1) It is arranged integrally. The actuating lever 56 is pushed backward by the pole base 3 when the guide roller 4 is advanced to load the tape, and the support 52 and the cleaning lever 53 are interlocked so that the cleaner ( 54 elastically pressurizes the headdrum assembly 30.
    Accordingly, when the upper drum 34 is rotated, the video head 38 is rotated together with the upper drum 34 so that the cleaner 54, which is elastically pressing the head drum assembly 30, is rotated. By contacting the tip of the 38, foreign matter accumulated in the video head 38 is removed.
    However, the conventional videohead cleaning apparatus has various problems because it always operates while contacting the videohead 38. First, the cleaner 54 must be periodically replaced in order to maintain the cleanness of the video head 38 in the prior art. That is, the cleaner 54 removes the foreign matter from the video head 38 at the first operation, but after a predetermined time, the foreign matter is accumulated in the cleaner 54, so that the cleaning effect is lowered, of course, the cleaner 54 The foreign matter accumulated in the) is reversed to the video head 38 to contaminate the video head 38. Further, when the cleaner 54 is used for a long time, the cleaner 54 is aging and wears out, which further exacerbates the above problem. In this case, it is necessary to replace the cleaner 54, but it is not only difficult for a general user to directly exchange the cleaner, but this also causes considerable inconvenience. Second, since the cleaner 54 is in constant contact with the video head 38 and the video head 38 is rotating at a high speed, the cleaner 54 is made of a soft material having a good cleaning effect such as a sponge. The wear of 38 becomes. If the video head 38 is contaminated or worn as described above, it will eventually adversely affect the playback or recording of the tape, which causes a great problem in the overall performance of the VCA.
    Accordingly, the present invention has been made in view of the above points, and an object of the present invention is to provide a video head cleaning apparatus capable of minimizing recontamination of the video head and wear of the video head while keeping the video head clean. have.
    1 is a perspective view showing the configuration of a conventional video head cleaning apparatus;
    2 is an exploded perspective view showing an embodiment of a video head cleaning apparatus according to the present invention;
    3 is a cross-sectional view showing a state in which the cleaning device according to the embodiment of Figure 2 installed in the head drum assembly,
    4 is an enlarged cross-sectional view of a main part of FIG. 3;
    5 is an enlarged cross-sectional view showing another embodiment of a video head cleaning apparatus according to the present invention.
    * Explanation of symbols for main parts of the drawings
    10: cleaning device 11, 21: bimetal
    15: pin 16, 26: cleaner
    30 head drum assembly 32 lower drum
    34: upper drum 36: axis
    38: videohead
    In order to achieve the above object, the video head cleaning apparatus according to the present invention has a lower drum and an upper drum and a head drum assembly of a video tape recorder having a video head fixed to scan a video cassette tape signal on the upper drum. In one embodiment, one end is fixed in close contact with the lower drum, and the connecting portion is inclined at a predetermined angle with the end, and the other end is formed as a free end, and a bimetal having a surface having a coefficient of thermal expansion close to the lower drum is formed. The free end of the bimetal consists of a cleaner provided to contact the video head.
    Hereinafter, embodiments of a video head cleaning apparatus according to the present invention will be described in detail with reference to the accompanying drawings. The same configuration as in the prior art omits the detailed description, and the same members are assigned the same member numbers.
    First, referring to FIGS. 2 to 4, FIGS. 2 to 4 show a first embodiment of a cleaning apparatus for a video head according to the present invention. 2, the cleaning apparatus 10 includes a bimetal 11, a cleaner 15, and a pin 16 rotatably installing the cleaner 15 on the bimetal 11. As is well known, the bimetal 11 is integrally formed to contact two metals having different thermal expansion coefficients, and the metal 11a having the large thermal expansion coefficient is disposed close to the lower drum 32 and is far from the lower drum 32. On the side, a metal 11b having a small coefficient of thermal expansion is disposed. The end 12 of one end of the bimetal 11 is formed to be in close contact with the lower drum 32, the connecting portion 13 extends to be inclined at a predetermined angle with the end 12, the other end 14 It is formed by a free end capable of thermal expansion. In this embodiment, the end 14 is bent relative to the connection 13 so as to be perpendicular to the axis 36 of the headdrum assembly 30 with reference to FIG. 3.
    On the upper surface of the end 14, the pin 16 is fixedly positioned to face upward. The pin 16 is formed with a groove 16a on the upper side to prevent the cleaner 15 from being separated through the washer 17. In the present embodiment, the cleaner 15 is a cylindrical body and forms a coupling through hole 16a at the center thereof and is rotatably coupled to the pin 16.
    On the other hand, the end 12 of one end of the bimetal 11 has a hole 12a formed therein, and a screw hole 32a is formed at a predetermined position of the lower drum 32. Accordingly, when the holes 12a of the end 12 and the screw holes 32a of the lower drum 32 are aligned and fitted with the screws 18, the bimetal 11 is fixed to the lower drum 32.
    3 shows a state in which the cleaning device 10 according to the configuration of the above-described embodiment is installed in the head drum assembly 30. As shown, the cleaning device 10 has one end securely fixed to the lower drum 32, and once the upper drum 34 is rotated, the cleaning device 10 comes into contact with the face of the video head 38, which is arranged two or four. While removing the foreign matter on the video head (38).
    The operation of the cleaning apparatus of the video head according to the present invention will now be described. 3 and 4, the cleaning device 10 shown in FIG. 4 by a dashed-dotted line, in particular, shows a state spaced apart from the video head 38. This is because the bimetal 11 of the cleaning apparatus 10 acts so that the cleaner 15, which has been in contact with the video head 38, is separated from the video head 38. When the upper drum 34 rotates in contact with the tape in the initial driving of the head drum assembly 30, the cleaner 15 periodically contacts the tip of the rotating video head 38 and removes foreign substances. On the other hand, if the upper drum 34 is continuously rotated, since the upper drum 34 and the tape is in constant surface contact, heat is generated by friction between each other. In addition, when the shaft 36 of the head drum assembly 30 rotates, heat is generated by the interaction between the main shaft 36 and the bearing 37, and the generated heat is in the direction of the arrow as shown in FIG. Is released. Accordingly, the heat transfers heat generated to the metal 11a having a large coefficient of thermal expansion close to the head drum assembly 30. Therefore, due to the inherent characteristics of the bimetal 11, the bimetal 11 is bent outward so that the cleaner 15 is separated from the video head 38.
    In summary, foreign matters of the video head 38 are removed in the initial stage by the above configuration and the action thereof, and the cleaning operation of the video head is stopped when the upper drum 34 is continuously rotated to a normal state. .
    Next, Fig. 5 shows a second embodiment of the video head cleaning apparatus according to the present invention. In FIG. 5, as shown in FIG. 4, the solid line indicates an initial driving state of the cleaning apparatus, and the dashed-dotted line indicates a state in which the cleaning apparatus is stopped. Referring briefly to the configuration of this embodiment with reference to Figure 5, the free end end 24 of the bimetal 21 is bent relative to the connecting portion 23 to be parallel to the axis 36 of the head drum assembly (30) The cleaner 25 is fixed to the inner surface of the end portion 24. In this embodiment as well, the bimetal 21 is bent outwardly in the direction of the arrow due to the frictional heat between the upper drum 34 and the tape and the frictional heat between the shaft 37 of the head drum assembly 30 and the bearing 37. ) Is spaced apart from the videohead 38.
    As described above, the cleaning apparatus of the video head according to the present invention, since the video head and the cleaner are contacted or spaced according to the driving time or state of the video head, while the video head is kept clean, the recontamination of the video head and the video head are performed. Wear can be minimized.
    权利要求:
    Claims (4)
    [1" claim-type="Currently amended] In the head drum assembly 30 of a video tape recorder having a lower drum 32 and an upper drum 34 and to which a video head 38 is fixed for scanning a signal of a video cassette tape to the upper drum 34. One end 12, 22 is tightly fixed to the lower drum 32, the connecting portions 13, 23 are inclined at a predetermined angle with the end 12, 22 and the other ends 14, 24 are free Bimetals 11 and 21 formed of stages and formed of metals 11a and 21a having a large thermal expansion coefficient on a surface adjacent to the lower drum 32 and ends 14 and 24 which are free ends of the bimetals 11 and 21. Cleaning device for a video head comprising a cleaner (15, 25) installed to contact the video head (38).
    [2" claim-type="Currently amended] 2. The free end (14) according to claim 1, wherein the free end (14) is bent relative to the connecting portion (13) of the bimetal (11) so as to be perpendicular to the axis (36) of the headdrum assembly (30). A pin 16 is fixed upwardly on the upper surface of the video head, and the cleaner 15 is rotatably fitted to the pin 16.
    [3" claim-type="Currently amended] The free end portion 24 is bent relative to the connecting portion 23 of the bimetal 21 so as to be parallel to the axis 36 of the head drum assembly 30, and the end portion 24 is formed. The cleaning device of the video head, the cleaner 25 is attached to the inner surface of the.
    [4" claim-type="Currently amended] 4. A screw hole (3) according to claim 2 or 3, wherein the end portions (12, 22) of one ends of the bimetals (11, 21) are tightly fixed to the lower drum (32). 32a, a through-hole 12a, 22a formed in the end portions 12, 22, and a video head fitted with screws 18 in the screw hole 32a and the through holes 12a, 22a. Cleaning device.
    类似技术:
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1996-12-30|Application filed by 배순훈, 대우전자 주식회사
    1996-12-30|Priority to KR1019960078394A
    1998-10-07|Publication of KR19980059058A
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019960078394A|KR19980059058A|1996-12-30|1996-12-30|V-Cal video head cleaning device|
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