This application claims the benefit under 35 U.S.C. § 119(a) of Korean Patent Application No. 2003-95752 filed on Dec. 23, 2003 in the Korean Intellectual Property Office, the entire disclosure of which is hereby incorporated by reference.
1. Field of the Invention
The present invention relates to a magnetic recording and reproducing apparatus. More particularly, the present invention relates to a pole base assembly for a magnetic recordingand reproducing apparatus that is adapted to move a magnetic tape into close contact with a head drum at the time of loading of the magnetic tape and to run in close contact with the head drun during running of the magnetic tape. The present invention also relates to a magnetic recording and reproducing apparatus employing such a pole base assembly.
2. Description of the Related Art
Typically, a magnetic recording and reproducing apparatus having a deck mechanism, such as a video tape recorder (VTR) or a camcorder, is an apparatus for recording data into and reproducing data from a magnetic tape while the magnetic tape is running along a predetermined route formed within the deck.
The deck chassis 10 forms the outer wall of the deck 100 and various driving components for recording and reproducing of data, such as the head drum 30, the pole base assemblies 50, etc., are disposed in the deck chassis 10.
The head drum 30 records data onto a magnetic tape 1 running within the deck 10 or reproduces the data recorded in the magnetic tape 1. As is well-known in the art, such a head drum 30 is installed to be slanted by a predetermined angle θ (see
Each pole base assembly 50 draws the magnetic tape 1 out of a tape cassette 90 at the time of loading the magnetic tape 1 to bring the magnetic tape 1 into close contact with the head drum 230 and to guide the magnetic tape 1 to run while being in contact with the head drum 30.
The conventional pole base assembly 50 includes a base member 51, a pole member 53, and a guide roller 55 as shown in
With the conventional deck 100 configured as described above, each of the pole base assemblies 50 are provided with both the pole member 53 and the guide roller 55, as shown in
Accordingly, an object of the present invention is to provide a pole base assembly for a magnetic recording and reproducing apparatus and a magnetic recording and reproducing apparatus employing such a pole base assembly.The pole base assembly is improved in construction to reduce the manufacturing costs and steps for the magnetic recording and reproducing apparatus and realizing the miniaturization of the magnetic recording and reproducing apparatus.
In order to achieve the above-mentioned object, a pole base assembly for a magnetic recording and reproducing apparatus includes a base member provided on a deck adapted to be moved toward the head drum at the time of loading the magnetic tape. A pole member is secured to the top surface of the base member and guides the magnetic tape to angularly run in a section where the magnetic tape contacts the head drum. A top edge guide member is disposed at the top end of the pole member and has a flange adapted to contact the top edge of the magnetic tape when the magnetic tape is running while in contact with the pole member and is moving toward the top end of the pole member.
With this arrangement, the pole member may guide the upward and downward movement of the magnetic tape in place of a conventional guide roller, whereby the manufacturing costs and steps for a magnetic recording and reproducing apparatus may be reduced. In addition, such a magnetic recording and reproducing apparatus may be easily miniaturized.
According to a preferred embodiment, it is preferable that the pole member is angularly connected to the top surface of the base member in such a way that the circumferential surface of the pole member contacting the magnetic tape is parallel to the rotational axis of the head drum when the loading of the magnetic tape has been completed. Preferably, the flange of the top edge guide member is formed to be slanted in relation to the circumferential surface of the pole member in such a way that the flange is parallel to the running direction of the magnetic tape in the section where the magnetic tape and the head drum are in contact with each other.
The top edge guide member preferably has a posture maintaining means to substantially prevent the pole member from being rotated in relation to the top edge guide member. The posture retaining means includes a guide pin extending from one side of the top edge guide member and a guide projection extending from the base member by a predetermined height and connected with the guide pin to prevent the top edge guide member from being rotated in relation to the pole member.
Preferably, the guide pin and the guide projection are slidably engaged in a direction parallel to the main axial direction of the pole member.
Preferably, the pole member has a threaded part formed at the bottom end thereof to be threaded into a fixing hole formed in the top surface of the base memberand the threaded part is subjected to anti-release treatment. The fixing hole has female threads formed on the internal surface of the fixing hole is cut by the male-threads of the threaded part when F the threaded part is press-fitted into the fixing hole.
In addition, a fixing projection and a fixing slot are formed at the bottom end of the thread part and the fixing hole, respectively, in such a way that they are press-fitted with each other when the threaded part is threaded into the fixing hole.
With this arrangement, the slant angle and the height of the pole member may be easily adjusted at the time of connecting the pole member and the base member.
Preferably, a bottom edge guide member is integrally formed on the base member, which comes into contact with the bottom edge of the magnetic tape when the magnetic tape contacts the pole member as the magnetic tape moves toward the bottom end of the pole member.
Preferably, the bottom edge guide member and the base member are integrally formed as a molded product of synthetic resin.
Furthermore, the top surface of the bottom edge guide member preferably forms an obtuse angle with the circumferential surface of the pole member.
The above and other objects and features of the present invention will be more apparent from the description for certain embodiments of the present invention taken with reference to the accompanying drawings, in which:
Throughout the drawings, like reference numbers will be understood to refer to like parts, components and structures.
The pole base assemblies 350 and 350′ draw a magnetic tape 1 (refer to
As shown in FIGS. 4 to 6, the supply side pole base assembly 350 includes a base assembly 351, a pole member 353, a first guide member 355, and a second guide member 357.
The base member 351 is moved to a loading position PI (see
The pole member 353 is secured to the top surface of the base member 351 and moved with the base member 351 at the time of loading the magnetic tape 1 (see
The pole member 353 according to the present embodiment is angularly secured to the top surface of the base member 351. This is because the head drum 30 is angularly installed on the deck chassis 10. The running posture of the magnetic tape 1 in a section B (refer to
In order to angularly connect the pole member 353 on the base member 351, the pole base assembly 350 according to the present embodiment includes a threaded part 356 formed at the bottom end of the pole member 353 and a fixing hole 354 formed in the base member 351. The threaded part 356 is formed in a taptite shape subjected to anti-release treatment. In addition, the male threads of the threads part 356 form female threads on the internal circumferential surface of the fixing hole 354 by cutting the internal circumferential surface of the fixing hole 354 when the threaded part 356 press-fitted into the fixing hole 354. For this purpose, it is preferred that the inner diameter D2 of the fixing hole 354 is somewhat smaller than the outer diameter D1 of the threaded part 356. With the screw connection between the threaded part 356 and the fixing hole 354, it is easy to set the height of the pole member 353 with reference to the base member 351. In addition, because the threaded part 356 is formed in the taptite shape, it is possible to prevent the threaded part from being reversely rotated due to an external impact or vibration, thereby preventing variation of the height of the pole member 353. Meanwhile, according to the present embodiment, a fixing projection 356a is extended from the bottom end of the threaded part 356, and the bottom surface of the fixing hole 354 is additionally formed with a fixing slot 354a (see
The pole base assembly 350 includes first and second guide members 355 and 357 to eliminate the conventional guide roller 55 (see
The first guide member 355 is integrally formed on the top surface of the base member 351 and comes into contact with the bottom edge of the magnetic tape 1 when the magnetic tape 1 is moved toward the bottom end of the pole member 353. The first guide member 355 and the base member 351 are preferably formed as molded products of synthetic resin so that the first guide member 355 and the base member 351 may easily be integrally formed with each other. In addition, it is preferable that the first guide member 355 and the circumferential surface of the pole member 353 form an obtuse angle therebetween. Considering the guiding of the bottom edge of the magnetic tape 1, preferably the angle formed between the first guide member 355 and the circumferential surface of the pole member 353 is about 90 degrees to 130 degrees. With this arrangement, the magnetic tape 1 returns to the center of the pole member 353, thereby avoiding damaging the magnetic tape.
A part of the top surface of the base member 351 adjacent to the bottom end of the pole member 353 is used as the first guide member 355. The guide rail 11 is formed parallel to the reference surface H (see
The second guide member 357 is provided at the top end of the pole member 357 and is provided with a flange 358 adapted to contactthe top edge of the magnetic tape 1 as it moves toward the top end of the pole member 353. Here, the flange 358 of the second guide member 357 is formed parallel to the running direction of the magnetic tape 1 in the section B (see
The second guide member 357 as described above is secured to the top end of the pole member by press-fitting the pole member 353 into the connecting hole 357c formed at the center of the second guide member 357. In addition, the second guide member 357 is enclosed by the cover member 359 at its top endto prevent the second guide member from breaking away from an upper part of the pole member 353.
Since the second guide member 357 and the pole member 353 are connected with each other, the pole base assembly 350 according to the present embodiment further comprises a posture retaining means to prevent the second guide member 357 from being rotated in relation to the pole member 353. The posture retaining means prevents the magnetic tape 1 from being incorrectly guided as the flange 353 formed to be angled in relation to the pole member 353 is rotated at the tope end of the pole member 353 The posture retaining means includes a guide pin 357a and a guide projection 352. A guide slit 357b is formed at the tip end of the guide pin 357a, and the guide slit 357b is slidably connected with the guide projection 352 extending from the base member 351. With this arrangement, the guide slit 357b and the guide projection 352 are substantially prevented from being separated from each other even when the height is varied by adjusting the thread connection between the threaded part 356 and the fixing hole 354.
In the above, the present invention has been described only in terms of the supply side pole base assembly 350 among a pair of pole base assemblies 350 and 350′. However, because the winding side pole base assembly 350′ is substantially similar to the supply side pole base assembly 350 in construction, the present invention is also applicable to the winding side pole base assembly 350′.
In addition, although the present invention has been described with reference to a deck of a camcorder by way of an example, the present invention is also applicable to a deck of a magnetic recording and reproducing apparatus of another type, such as a vide tape recorder (VTR) if such a deck includes a pole base assembly with a pole base and a base member as described above.
According to the present invention as described above, the first and second guide members 355, 355′ and 357 are provided at the top and bottom ends of the pole member 353 of the pole base assemblies 350, 350′ and 350″, respectively, to guide the upward and downward movement of the magnetic tape. Accordingly, it is not required to provide a separate member, such as a conventional guide roller 55 (refer to
While the preferred embodiments of the present invention have been shown and described in order to exemplify the principle of the present invention, the present invention is not limited to the specific embodiments. It will be understood that various modifications and changes can be made by one skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, it shall be considered that such modifications, changes and equivalents thereof are all included within the scope of the present invention.
Number | Date | Country | Kind |
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2003-95752 | Dec 2003 | KR | national |