JPS6051167B2 - Tape feeding mechanism of magnetic recording/reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape feeding mechanism for a cassette type magnetic recording/reproducing device.

Conventional tape feeding mechanisms of this type typically have a pinch roller on a moving head substrate pressed against a capstan fixed to a chassis via a magnetic tape.

FIG. 1 is a schematic sectional view showing such a conventional example. In the figure, 1 is a fixed board (chassis), 2 is a capstan, 21 is its bearing, 22 is a thrust bearing, 3 is a pinch roller, 31 is a pinch roller arm, 4 is a magnetic tape, 41 is a capstan 2 and pinch roller 3 This shows the part of the magnetic tape sandwiched between the two. 5 is the reel shaft, 5 is the reel pawl, 6 is the reel hub, 7 is the cassette, 2' is the cassette 7
8 is a rubber belt, and 9 is a flywheel.

As shown in the figure, in the conventional device, the capstan 2 is supported in a cantilever state with respect to the chassis 1 protruding above the chassis 1, and a large lateral pressure is applied each time the pinch roller 3 is crimped. Although the stun 2 must be made long in the axial direction, it is not possible to make a bearing that is too long due to space constraints, and a thrust bearing is provided below it. Therefore, a relatively large space is required below the chassis 1, and the overall thickness of the tape recorder is also increased. The present invention eliminates the above-mentioned drawbacks and provides a tape recorder that can be easily made thin by disposing a pinch roller in the position of a conventional capstan and using the conventional pinch roller as a driving roller to perform the function of a conventional capstan. It is an attempt to obtain.

J Hereinafter, the present invention will be specifically explained using the drawings. Second
The figure is a plan view showing an embodiment of the present invention. In the figure, reference numeral 1' denotes a reel board which is configured to be able to reciprocate in the direction of arrow B on a chassis (not shown). The figure shows a state in which the reel board 1' is slid downward in the figure. 10 is a pinch roller fixed to the reel board 1', and 12 is its mounting portion.

Reference numeral 11 denotes a drive roller fixed to the chassis, which pinches the magnetic tape between it and the pinch roller 10 and drives the magnetic tape.

8 is a rubber belt, 9 is a flywheel (with gear teeth).

) 13 is a motor. A reel shaft 5 is fixed to the reel board ``, and a gear is attached to the reel shaft 5 as shown by the dotted line on the back side of the reel board 1'', and when the reel board 1'' is moved forward, the flywheel is 9.The reel shaft 5 has a reel base plate 1''.
A reel claw similar to the conventional example is attached to the front side of the reel board 1'', and is engaged with the reel hub when the tape cassette 7 containing magnetic tape is mounted on the reel board 1''. is inserted into the tape cassette 7 through a positioning hole on the front opening side of the tape cassette 7.The chassis has a magnetic head (not shown) facing the front opening of the tape cassette 7 mounted on the reel board 1''. ) and a drive roller 11 are provided. PB is a push button 14 for reciprocating the reel board 1'' as described above.
, 15 are springs.

The figure shows a state in which the reel board 1'' is slid forward by pushing the push button PB, and the pinch roller 10 is pressed against the drive roller 11 via the magnetic tape. ) It can be configured to also serve as a playback operation button. Then, the reel board 1'' can be slid in conjunction with the recording and/or playback operations of the tape recorder. When the push button PB is unlocked by a suitable known means, the push button PB is returned to its original position by the spring 14, and the reel base plate 1'' is moved back, and the pinch roller 10 and drive port 11 are moved back.
are separated and tape feeding is stopped. In order to guide the reciprocating motion as described above, for example, the reel board 1'' is provided with a plurality of slots 16, and the chassis is provided with a pin 17 that engages with the slots. 1 is a sectional view taken along line A. In the figure, the same parts as those shown in FIGS. 1 and 2 are given the same reference numerals. It is an enlarged view of the pinch roller 10 and the drive roller 11 in the figure.A mounting portion 12 for fixing the pinch roller 10 to the reel substrate 1'' is formed integrally with the reel substrate 1'' using synthetic resin, for example, and The shaft 101 of No. 10 is supported at two locations, upper and lower. No. 10 indicates the bearing portion thereof.

With this configuration, the pinch roller 10 can be made extremely small so that it can be inserted into the positioning hole 2'' of the cassette 7. The vertical surface 121 at the lower end of the mounting portion 12 can be used as a cassette positioning guide. sell.
In some cases, both the vertical surface 121 and the opposing vertical surface 122 can be used as positioning guides. The shaft 111 of the drive roller 11 has its upper half inserted into and fixed to, for example, a metal cylindrical part 91 press-fitted into the center of the roller 11, and its lower half fixed to the chassis 1), which is long in the axial direction. It is supported by a bearing 112. A pulley part 92 that is integrally connected or formed with the flywheel 9 is attached to the cylindrical part 91 by a cylindrical part 95 having a larger diameter than the cylindrical part 91.
to be united with. A deep hole 94 into which the bearing 112 can be inserted is provided inside the combined body of these 9, 92, and 93. A thrust receiver 113 may be provided at the upper end of the shaft 111. 114 indicates a washer.

In this way, the drive roller 1 is placed in the position of the conventional pinch roller.
1, when fixing the drive roller 11 to the chassis 1, there is no space restriction like when fixing the conventional capstan 2 to the chassis 1.
The bearing 11 is sufficiently long in the direction of the shaft 111 of the drive roller 11.
. It becomes possible to configure. Therefore, the thrust receiver 22, which was conventionally provided at the lower end of the capstan 2, is also unnecessary, so the thickness of the tape recorder can be reduced. Also, a flywheel 9 and a pulley part 9.

By reducing the thickness of the combined body, the tape recorder can be made even thinner. In the helical helical mechanism as shown in FIG. 1, no matter how thin the flywheel 9 and pulley portion 92 are made, the distance between the bearing 21 and the thrust receiver 22 cannot be reduced much due to design. Therefore, according to the present invention, it is much easier to design a tape feeding mechanism to be thinner than the conventional one in which a capstan is inserted through a positioning hole provided in a cassette. Regarding the materials of the pinch roller 10 and the drive roller 11, it is common that the pinch roller 10 is made of rubber and the drive roller 11 is made of metal, but the opposite may be used.

Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments, and that the present invention can be modified and changed within the scope of the scope of the claims.

[Brief Description of the Drawings] Fig. 1 is a schematic sectional view showing a conventional example, Fig. 2 is a plan view showing an embodiment of the present invention, Fig. 3 is a sectional view taken along line A-A in Fig. 2; 4 and 5 are enlarged views of the main parts in FIG. 3. 1...Fixed board, 1''...Reel board,
4... Magnetic tape, 5... Reel shaft, 6...
... Reel hub, 7... Tape cassette,
2″...Positioning hole on the front opening side of the cassette, 10...Zench roller, 11...Drive roller, PB...Operation button.

Claims (1)

[Claims] 1. A reel board to which a reel shaft that engages with a reel hub of a tape cassette containing a magnetic tape and a pinch roller that is inserted into the tape cassette through a positioning hole on the front opening side of the tape cassette are fixed; A fixed substrate having a magnetic head and a drive roller arranged opposite to the front opening of the tape cassette bonded to the reel substrate is provided, and by operating a magnetic recording and reproducing device, the reel substrate is connected to the fixed substrate. A tape feeding mechanism of a magnetic recording/reproducing apparatus, wherein a pinch roller slid on the top and inserted into the tape cassette is pressed against a drive roller rotated by a motor via a magnetic tape.