Dynamic magnetic information storage or retrieval – Head mounting – For moving head during transducing
Reexamination Certificate
2001-01-24
2004-04-20
Heinz, A. J. (Department: 2653)
Dynamic magnetic information storage or retrieval
Head mounting
For moving head during transducing
C360S271100, C360S271500, C360S271100
Reexamination Certificate
active
06724579
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a head drum assembly, and more particularly to a head drum assembly mounting structure on a deck of a tape recorder.
2. Description of the Background Art
Generally, a tape recorder such as a camcorder, VCR, or the like has a fast rotating head drum assembly mounted on a main base of a deck. The head drum assembly includes a magnetic head which scans a traveling magnetic tape for information recording/reproducing.
As shown in
FIG. 1
, a conventional head drum assembly
20
includes an upper drum
21
and a lower drum
22
. The upper drum
21
and lower drum
22
are disposed on a same shaft
23
in such a manner that the upper drum
21
is rotatably supported by the shaft
23
, and the lower drum
22
is fixed to the lower portion of the upper drum
21
. The head drum assembly
20
, constructed as above, usually employs a Helical scanning type in which the head drum assembly
20
is slanted on a predetermined slant with respect to the main base
10
of the deck to stably guide the running of the magnetic tape.
The Helical scanning type head drum assembly
20
includes a guide groove
22
a
formed on an outer circumference of a lower end of the lower drum
22
. Ends of a plurality of brackets
24
are inserted in the guide groove
22
a
in such a manner as to be spaced from each other by a uniform distance. In this situation, the lower drum
22
and the other ends of the brackets
24
are mounted on the drum base
11
of the main base
10
. The other ends of the brackets
24
are fastened to the drum base
11
by screws (S). A reference numeral
22
b
refers to a lead line, which is an outer circumference of the lower drum
22
stepped to guide the traveling of the magnetic tape. Also, reference numeral
25
is a drum boss received in a central opening of the drum base
11
, and S
1
refers to coupling holes formed in the brackets
24
.
As shown in
FIG. 2
, the drum base
11
is a ring type rib, for example, having an opening formed in the center thereof, three screw coupling holes S
2
formed therein at a uniform distance from each other, and a pair of positioning pins
11
a
and
11
b.
FIG. 3
is a sectional view taken on line III—III of FIG.
2
. The drum base
11
is usually integrally formed with the main base
10
by proper processes such as a drawing, or the like, on a predetermined slant with respect to the main base
10
.
The pair of positioning pins
11
a
and
11
b
stand substantially in a perpendicular relation with the slant plane of the drum base
11
. The positioning pins
11
a
and
11
b
determine the mounting position and posture of the lower drum
22
which is mounted on the drum base
11
, by a complementary connection with a positioning hole (not shown) formed in a lower surface of the drum boss
25
. Accordingly, screw coupling holes (S
1
and S
2
) of the drum base
11
and the brackets
24
are aligned with each other, permitting the screw (S) to pass therethrough and fasten.
In the conventional head drum assembly mounting structure, however, due to the fact that the brackets
24
press the lead line
22
b
while the drum base
11
and the brackets
24
are fastened by the screws (S), the lead line
22
b
of the lower drum
22
is often deformed.
Further, in order to insert one end of each of the brackets
24
to the lower drum
22
, many processes are required, such as a process of processing the guide groove
22
a
for receiving the ends of the brackets
24
, and also many parts are required, such as three brackets
24
, the screw (S) and the pair of positioning pins
11
a
and
11
b
, or the like. Accordingly, due to deteriorated assembly efficiency and increased manufacturing cost, productivity is deteriorated.
SUMMARY OF THE INVENTION
The present invention has been developed to overcome the above-mentioned problems of the related art, and accordingly, it is an object of the present invention to provide a head drum assembly mounting structure on a deck base of a tape recorder capable of accomplishing cost effectiveness by decreasing the number of parts and improving assembly efficiency, and also establishing a quality stabilization by basically preventing any damage to the lead line of the lower drum during the assembly process.
The above object is accomplished by a head drum assembly mounting structure on a deck base of a tape recorder according to the present invention, including a head drum assembly which comprises: an upper drum, a lower drum, and a drum boss, all of which are connected to the same shaft; a drum base slanted on a main base of a deck; and a positioning and connecting means for determining a relative position of the drum base and the drum boss while complementarily connecting the drum base with the drum boss.
The positioning and connecting means includes: at least one positioning hole and at least one first coupling hole formed in a lower portion of the drum boss; a positioning pin formed on the drum base so as to be inserted into the positioning hole; and a second coupling hole formed in the drum base and corresponding to the first coupling hole for receiving a coupling member.
According to another aspect of the present invention, the positioning and connecting means comprise: at least one locking hole formed in a lower portion of the drum boss; and a hook pin formed on the drum base and corresponding to the locking hole for being complementarily connected with the locking hole.
The above object is also accomplished by a head drum assembly mounting structure on a deck base of a tape recorder according to another embodiment of the present invention, and including: a head drum assembly including an upper drum and a lower drum, both of which are connected to the same shaft; a slant boss formed on a lower portion of the lower drum for supporting the head drum assembly so as to be slanted with respect to a main base of a deck for surface-contact between the head drum assembly and the main base of the deck; and a connecting means for connecting the main base and the slant boss.
According to another aspect of the present invention, a positioning means is provided for determining a connecting position of the head drum assembly by a complementary connection between the main base and the lower drum. The positioning means includes: a plurality of positioning holes formed in the main base; and a plurality of guiding bosses protruding from a lower portion of the lower drum by different lengths, and corresponding to the plurality of positioning holes, so as to be inserted into and supported in the plurality of positioning holes.
REFERENCES:
patent: 5459625 (1995-10-01), Ohshima et al.
patent: 5831796 (1998-11-01), Nishida
patent: 5936809 (1999-08-01), Nishida et al.
Blouin Mark
Bushnell Robert E.
Heinz A. J.
Samsung Electronics Co,. Ltd.
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