JPH0313851Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a magnetic head retraction position holding mechanism.
In particular, in a reversible tape recorder, when changing the tape running from forward recording to reverse recording, for example, the magnetic head on the head board is mechanically moved away from and retracted from the magnetic tape using a head reversal switching lever. The present invention relates to a magnetic head retracted position holding mechanism which maintains the retracted position of the magnetic head while the magnetic head is inverted.

(Prior Art) Conventionally, the drive mechanism of this type of reversible tape recorder has been composed of a combination of a large number of gears, rotary levers, cams, etc., making the drive mechanism complex.

(Problems to be solved by the invention) In particular, since the reversing trigger lever that reverses the magnetic head and the drive lever that retracts the head board are composed of two members, the device has a large number of parts and requires a large number of assembly steps. Not only was the cost high, but the reliability of the equipment was poor.

(Means for Solving the Problems) The present invention has been made to solve the above-mentioned conventional drawbacks, and includes a cam portion 6 and a magnetic head 11.
a reversing gear 5 for reversing the
It consists of a rotatable reversing trigger lever 7 which faces the head so that it can be latched to the head, and whose other end is latched to the head reversal switching lever 8 and which locks the head board 10 on which the magnetic head 11 is mounted. By operating the reversing switching lever 8, the reversing trigger lever 7 is rotated, and the head board 10 is rotated.
This invention provides a magnetic head retracted position holding mechanism characterized in that the rotational position of the reversing trigger lever 7 is held by the cam 6 when the magnetic head is retracted from the reproduction position.

(Embodiment) Fig. 1 is a plan view showing a part of the main part of the magnetic head retracted position holding mechanism of the present invention, in which Fig. 1A shows the state during recording and playback, and Fig. 1B shows the state when the head is reversed.

On the front panel side (not shown) of the device, a pause button, fast forward button, rewind button, play button, record button, stop button, and magnetic head reversal button (not shown) are arranged in a row. ing.

In the figure, 1 and 2 are a forward rotation capstan and a reverse rotation capstan, which rotate integrally with a flywheel (not shown) and rotate counterclockwise and clockwise, respectively, in the directions indicated by arrows by a motor (not shown). being driven. Note that 1a and 2a are flywheel gears.

The intermediate gear 3 that constantly meshes with the flywheel gear 1a is equipped with a small gear (driving gear) 4, and this small gear 4 is a reversing gear (a partially toothed cam gear) having a toothless portion that controls the reversing operation of the magnetic head. It is possible to mesh with 5. That is, the flywheel gear 1a and the reversing gear 5 rotate in the same direction (counterclockwise). Further, a cam 6 having a shape in which two fan-shaped cams are joined together is integrally formed on the reversing gear 5 so as to be rotationally symmetrical.

Reference numeral 7 denotes a reversing trigger lever, whose tip bent portion 7a locks the cam groove 6a of the cam 6, and its rear end portion 7b locks with the lever 8 of the head reversing switch button, and rotates clockwise with respect to the shaft 9. It is rotatable.

Reference numeral 10 designates a head board on which a magnetic head 11 is mounted, and a protrusion 10a hanging down from the head board is in constant contact with a pin 15 implanted in the reversing trigger lever 7.

A gear 1 is attached to the tip of the rotating shaft 12 of the magnetic head 11.
3 is fixed, and a sector gear 14 meshes with this gear 13. A protrusion extending downward and integrally attached to the sector gear 14 is engaged with a connecting member (not shown) such as a rotating lever that cooperates with the reversing gear 5. When the magnetic head 11 rotates, the magnetic head 11 is rotated in the opposite direction about the axis via the sector gear 14 and the gear 13 meshed therewith.

Note that 16 is a motor SW that is operated by clockwise rotation of the reversing trigger lever 7, and when the reversing trigger lever 7 is rotated by operating the lever 8, this turns the motor SW 16 ON. As a result, the reversing gear 5 is driven in reverse.

Here, the reversing operation of the magnetic head will be explained.

When the reversing switching lever 8 is pressed, the reversing trigger lever 7 rotates clockwise about the shaft 9, as shown in FIG. This reversing trigger lever 7
Due to the rotational force of the head board 10, which is locked to the pin 15, moves downward (clockwise) in the figure, breaking contact between the magnetic tape (not shown) and the magnetic head 11, and triggering the reversing trigger. The bent end portion 7a of the lever 7 escapes from the cam groove 6a of the cam 6, allowing rotation of the reversing gear. At this time, by rotating the reversing trigger lever 7 clockwise, the motor SW1
6 is turned ON, the reversing gear 5 is driven, and the tip bent portion 7a of the trigger lever 7 slides on the cam 6 and contacts the protrusion 10a of the head board 10, thereby self-maintaining the rotating position of the trigger lever. At the same time, the head substrate 10, which is locked to the trigger lever 7, is self-held at a position retracted from the recording/reproducing position.

Therefore, while the head board 10 is retracting, the magnetic head 11 can be reversed via the sector gear 14 and the gear 13 by a rotating lever (not shown), so that the cam gear can be operated as in the conventional manner. without applying any load to the drive mechanism and without causing uneven rotation of the flywheel.
Stable operation of equipment is possible. In addition, unpleasant driving noise and shaking can be prevented when the head is turned over.

(Effects of the invention) As described above, in the magnetic head reversal position holding mechanism according to the present invention, the reversal trigger lever for reversing the magnetic head operates to retreat the head board, and the reversing trigger lever and the cam It has the advantage that the retracted position of the head board is self-maintained through interaction with the head board, no extra load is applied to the drive gear, and it can be constructed at low cost with a small number of components.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a part of the main part of the magnetic head retracted position holding mechanism according to the present invention, in which FIG. 1A shows the state during recording and playback, and FIG. 1B shows the state when the head is reversed. 1a, 2a...flywheel gear, 3...intermediate gear, 4...pinion gear, 5...reversing gear, 6...cam, 7...
Reversing trigger lever, 8... Head reversing switching lever, 10... Head board, 11... Magnetic head.

Claims (1)

[Scope of utility model registration request] A reversing gear comprising a cam portion and reversing the magnetic head, and a head having one end facing the cam portion so as to be latched thereto, the other end being latched to a head reversal switching lever, and equipped with a magnetic head. It consists of a rotatable reversing trigger lever that locks the board, and when the reversing trigger lever is rotated and the head board is retreated from the recording/reproducing position by operating the reversing switching lever, the cam 1. A magnetic head retraction position holding mechanism, characterized in that the rotational position of said reversing trigger lever is held by said reversing trigger lever.