JPH067457Y2 - Cassette type tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rotary head type reverse type cassette tape recorder.

[Prior art]

In the conventional tape recorder, as shown in FIGS. 5 and 6, the head substrate 7 is provided with the pin 8 and the pin 8 is arranged so as to come into contact with the mode cam 19 to dispose the head substrate 7.
Is moving back and forth. When the tape recorder for moving the head substrate 7 and the like by the mode cam 19 is of the automatic reverse type, the mode cam 19 has a stop mode position a, a fast forward / rewind mode position b, and a tape normal position in the clockwise direction in FIG. A pause mode position c in the running direction, a tape forward running direction recording / playback mode position d, and a tape reverse running direction recording / playback mode position d ′ are provided, and a pause mode position c ′ in the tape reverse running direction is provided to forward or reverse the tape. Independent cam positions are set in, but for the stop mode position a and the fast forward / rewind mode position b,
It is commonly used for reverse rotation.

A gear 21 that is driven to rotate by a motor (not shown) is fixed to the rotation shaft 20 of the mode cam 19, and a mode for detecting the head substrate position determined by the rotation position of the mode cam 19 is provided on the lower surface of the gear 21. A control switch contact piece 10 is integrally provided, and the switch contact piece 10 is slidably contacted with a circuit pattern provided on the printed circuit board 2 so that the rotational position of the mode cam 19 can be detected.

Furthermore, the rotary shaft 20 has reel stands 16 and 17 in the stop mode.
A reel stand brake cam 22 for applying a brake to the pinch roller 23 and a pinch roller control cam 25 for switching the pinch rollers 23, 24 to be pressed against the capstan shaft depending on the tape running direction are provided.

A magnetic head 9 is rotatably mounted on the head substrate 7 and rotates 180 degrees according to the tape running direction. The head rotating mechanism is also moved by a cam, a lever, and the like (not shown) fixed to the rotating shaft 20, but this is not shown.

Therefore, in the conventional auto-reverse type tape recorder, as shown in FIG. 5, the modes of the mode cam 19 are not completely independent in the forward running direction and the reverse running direction of the tape. In the mode, the rotary magnetic head 9 has two directions of forward rotation and reverse rotation. For this reason, the output of the mode control switch should be used to detect the head direction whether the head core is at the upper track position or the lower track position, that is, which direction the head corresponds to the tape running direction. However, a separate switch is provided to detect the position of the lever that rotates the rotary magnetic head, and this output is used for detecting the head direction.

Further, in the mode arrangement of the mode cam 19 shown in FIG. 5, the pause mode position c (which is also used as the cue review mode position in this conventional example) is fast-searched for the tape contacting the pin 8. When switching to the stop mode, the mode cam 19 moves from the pause mode position c to fast forward /
Since it rotates clockwise from the rewind mode position b to the stop mode position a, it takes a long time to brake the reel base after the motor that drives the reel base is stopped, and then the stop mode is set, which causes slack in the tape. There are drawbacks such as swelling.

[Purpose of device]

In view of the above-mentioned drawbacks, the present invention makes it possible to use the output of the mode control switch to display the forward / reverse direction of the head, so that each mode in the forward / reverse direction, fast forward / rewind, stop / pause / record. By setting the playback position independently, the brake of the reel stand operates reliably not only in the fast forward / rewind mode → stop mode but also in cue review (pause) mode → stop mode, causing slack in the tape. The purpose is to propose a cassette type tape recorder that eliminates the need for cost reduction and improved characteristics.

[Constitution of device]

According to the present invention, a mode cam, which is rotationally driven by a motor, is provided with a cam surface in the tape forward running direction and a cam surface in the tape reverse running direction, and the position of the head substrate is switched by the rotation of the mode cam so that the tape runs in both directions. In the cassette type tape recorder, the operation mode is independently provided on the cam surface in the tape forward running direction and the cam surface in the tape reverse running direction, and the cam surface in the tape normal running direction is provided. A fast-forward / rewind mode is arranged near one boundary with the cam surface in the tape reverse running direction, and a recording / reproducing mode is arranged near the other boundary part, and between the fast-forward / rewind mode and the recording / reproducing mode. That is, the stop mode is arranged.

〔Example〕

Hereinafter, the present invention will be described with reference to an illustrated embodiment. In FIG. 1 and FIG. 2, the cassette tape recorder has a printed circuit board 2 attached to the lower side of the chassis 1 for a predetermined period of time, and a rotary shaft 3 is supported by the chassis 1 and the printed circuit board 2 so as to be integrated with the rotary shaft 3. Is provided with a helical gear 4 and a mode cam 5, a worm rotated by a motor (not shown) is meshed with the helical gear 4, and an integrally rotated mode control switch contact piece 10 is provided below the helical gear 4. The circuit board 6 of FIG. 3 provided on the printed circuit board 2 is slidably contacted, and the pins 8 projecting from the lower side of the head circuit board 7 are inserted into the cam grooves 5a of the mode cam 5 so that the head circuit board 7 moves back and forth. The head substrate 7 is supported on the chassis 1 by the pins 11 and 11, and the rotary magnetic head 9 is provided on the head substrate 7. The head substrate 7 is provided on the right and left sides of the head substrate 7 for the tape forward running direction and the tape reverse running direction, respectively. Capstan shaft 12 and pinch lever 14, 15 and the reel base 16, 17 for direction is arranged.

On the outer periphery of the mode cam 5 as shown in FIG. 4, reel base brake cam surfaces 5b and 5c for braking the reel bases 16 and 17 in the stop mode are formed, and the brake lever 18 is slidably contacted as shown in FIG. Has been done.

The cam groove 5a of the mode cam 5 is formed so that the left side of the line AA 'passing through the rotary shaft 3 in FIG. 4 is the cam surface α in the normal tape traveling direction and the right side is the cam surface β in the reverse tape traveling direction. The operation modes are set independently of each other, and the fast-forward / rewind mode positions b and b'are located near the boundary γ between the cam surface α in the normal tape traveling direction and the cam surface β in the reverse tape traveling direction, and the other boundary. Recording and reproduction mode positions d and d'are respectively arranged near the portions δ and δ ', and stop mode positions a and a are provided between the fast-forward / rewind mode positions b and b'and the recording and reproduction mode positions d and d'. 'And the pause mode positions c and c'are arranged, and the circuit pattern 6 has the same structure.

Further, a part of the circuit pattern 6 is used to form a pattern surface over the entire area corresponding to the cam surface β in the reverse tape traveling direction, and when the tape is in the normal traveling direction [1] in each mode on that side, in the tape reverse traveling direction. Each mode [0] on that side is configured to display the direction of the normal rotation side or the reverse rotation side of the rotary magnetic head 9 by the output of these portions.

When the cassette type tape recorder is constructed as described above, when it is switched from the fast-forward / rewind mode positions b and b'to the stop mode positions a and a ', they are provided adjacent to each other, so that the cassette mode is immediately changed to the stop mode position. Then, the brake is applied to the reel stands 16 and 17, and the reel stands are driven because the mode cam 5 has a small rotation angle provided adjacently in the cue review mode (the cam position is the pause position) to the stop mode. Immediately after the motor is stopped, the brakes are applied to the reel stands 16 and 17. Therefore, it is possible to prevent the slack of the tape. In addition, the output of the mode control switch can be used to detect and display the direction of the magnetic head, that is, whether the head core is at the upper track position or the lower track position, so that the output of the mode control switch can be eliminated. It is possible to simplify the mechanism.

[Effect of device]

As described above, the present invention switches the position of the head substrate by the rotation of the mode cam, and separately provides each operation mode on the cam surface in the tape forward running direction and the cam surface in the tape reverse running direction, thereby enabling the tape forward running. The fast-forward / rewind mode is located near the boundary between the cam surface in the direction of the tape and the cam surface in the reverse tape direction, and the recording / playback mode is located near the boundary of the other side. Since the stop mode is placed between the mode and the mode, when the reel base is turned from the rotational drive state to the stop state, the motor can be stopped immediately and the reel base can be braked immediately. It is possible to provide a cassette-type tape recorder that has excellent practical effects such as that

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a plan view of a main part showing a rotary type cassette tape recorder of the reverse type, and FIG. 2 is a partial sectional side view of the same part. Is a plan view of a circuit pattern, FIG. 4 is an enlarged plan view of a mode cam, FIG. 5 is a plan view of a main portion of a conventional cassette type tape recorder, and FIG. 6 is a partial cross-sectional side view of the main portion. 5: Mode cam, a, a '... Stop mode, b,
b '... fast forward / rewind mode, d, d' ... recording / reproducing mode, α, β ... cam surface, γ ... near one boundary,
δ, δ '... Near the other boundary.

Claims (1)

[Scope of utility model registration request] 1. A mode cam, which is rotationally driven by a motor, is provided with a cam surface in the normal tape running direction and a cam surface in the reverse tape running direction, and the position of the head substrate is switched by the rotation of the mode cam to run the tape in both directions. In the cassette type tape recorder thus configured, each of the operation modes is independently provided on the cam surface in the tape normal running direction and the cam surface in the tape reverse running direction, and the cam surface in the tape normal running direction is provided. , A fast-forward / rewind mode is arranged near one boundary with the cam surface in the tape reverse running direction, and a recording / reproducing mode is arranged near the other boundary portion, respectively, and between the fast-forward / rewind mode and the recording / reproducing mode. A cassette type tape recorder characterized in that a stop mode is arranged in the.