JPS6216267A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To use the previous recording final part as the first part of the next recording without fail by providing a protrusion to lock to a winding clutch gear and stopping the rotation when a supply reel turn table being unloaded is driven. CONSTITUTION:At unloading, a winding clutch gear 3b is locked by a protrusion 9, the rotation of the winding reel turn table to gear with it is stopped, an idle gear 4 and a supply clutch gear 3a are geared, the supply reel turn table to gear with it is rotated and the tape is wound without sagging. Even when the protrusion locks a clutch 3b, the clutch 3b can be rotated at prescribed torque or above by a sliding mechanism. At loading, the clutch 3a is locked and the gear 4 and the clutch 3b are geared. After the recording action, even when the unloading is executed, even the cassette is taken out, charged again, and loaded, the previous recording final part can be used as the first part of the next recording, and the previous final part is not deleted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic recording and reproducing device that has an improved braking structure for a reel stand that operates during an unloading operation.

[Background of the invention]

Conventionally, in magnetic recording and reproducing devices, when recording is interrupted, the cassette is taken out, and then the cassette is loaded onto the cassette reel stand again and the tape is loaded, the last position of the previously recorded section is set as the recording start position. Roating/
For unloading, the following configuration is used.
ing. The structure is such that a weak braking force is applied to the reel stand on the supply side and a greater braking force is applied to the reel stand on the winding side than that on the supply side, and the tape is wound up on the reel on the supply side. The reel table rotational torque for winding the tape during unloading is set by a torque limiter to prevent excessive tape tension from being applied. Conventionally, the brake during unloading has been set in synchronization with the movement of the pinch roller arm, which tends to require a large number of parts and requires space. Although there has not been a conventional system using a pinch roller system, a continuous photographing mechanism using an idler is known from Japanese Utility Model Application No. 58-26751. However, this type uses a link system, and the number of parts tends to increase.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and it reduces the number of parts, and when the cassette is removed after recording and the cassette is loaded again, it ensures that the last part of the previous recording becomes the beginning of the next recording. The object of the present invention is to provide a magnetic recording/reproducing device that can perform the following functions.

[Summary of the invention]

The magnetic recording/reproducing device of the present invention includes: a supply side clutch gear having a sliding mechanism that meshes with the supply side reel stand; a take-up side clutch gear that has a sliding mechanism that meshes with the take-up side reel stand; The tape in the magnetic tape cassette is connected to a rotating magnetic head. Loading into the mounted cylinder.

The eye is configured to be unloaded, and the eye is provided with a protrusion that engages with the take-up side clutch gear and stops rotation of the take-up side clutch gear when the unloading supply side reel table is driven. Installed on the drive base
fC- thing.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The magnetic recording/reproducing apparatus of the present invention will be explained below using embodiments with reference to FIGS. 1 to 3. Figure 1 is a plan view, Figure 2 is a plan view,
Figure 3 shows the unloading process.

It is an explanatory diagram of a reel stand drive part in a loading state.

In the figure, 1 is the chassis, 2a is the supply side reel stand, 2
b is a take-up side reel stand, 5a and 5b are a supply side clutch gear and a take-up side clutch gear each having a sliding mechanism. The supply side reel stand 2 and the supply side clutch gear 3a are always engaged at 9 degrees, and the take-up side reel stand 2b and the take-up side clutch gear 6b are also engaged at 9 degrees. Reference numeral 4 is an idler gear that oscillates and meshes with the supply side clutch gear 3a and the take-up side clutch gear 3b to transmit rotational force, and is supported on an idler base 5 that is swingably mounted. has been done. A capstan motor 6 rotates the idle gear 4, and a capstan 7 is driven by the capstan motor 6 via a belt (not shown). Reference numeral 8 denotes a pinch roller, which acts as a trap to press against the capstan 7 with a predetermined pressure when the roller is gray. 10 is a cylinder on which a magnetic head is mounted.

FIG. 2 shows the time of unloading, and the rotational force from the capstan motor 6 is reversely transmitted to the belt drive, causing the idle gear 4 to swing nine revolutions. At the time of unrotting, the supply side reel stand 2a'ft is rotated to wind the tape without causing any slack. At that time, the protrusion 9 integrally formed in the idler base 5 in the shape of a claw is connected to the winding side clutch gear 313.
The rotation of the take-up reel stand 2, which engages with the take-up clutch 3b, is stopped. and.

As shown in FIG. 4, the protrusion 9 is adapted to be engaged with the lower gear of the two-stage gear of the winding side clutch gear 3b.

The take-up side clutch 3b has a sliding mechanism, and even if the protrusion 9 of the idler base 5 is engaged with the take-up side clutch 3b, it is structured so that it can rotate above a certain predetermined torque.

FIG. 3 explains the operation during loading, in which the idler 4 attempts to swing the take-up side clutch gear 3b, but another locking member 11 [latches at a predetermined position]. It is formed so as not to come into contact with the supply side clutch gear 3b. Therefore, when unloading the magnetic tape to be stored in the cassette, it is certain that the tape slackens from the take-up reel stand 3b side because the take-up side clutch gear 2a of the take-up side reel stand 5b is stopped from rotating. be prevented. For this reason, when unloading, the take-up side reel stand 2
It is possible to give the optimum braking force to b.

In this way, the magnetic recording/reproducing apparatus of this embodiment performs unloading after the recording operation by winding the tape on the supply side reel stand and stopping the rotation of the take-up reel stand during unloading. Even if the cassette is removed, the cassette is inserted again, and the cassette is loaded, the last part of the previous recording can be ensured to be the beginning of the next recording, and the last part of the previous recording part can be erased. There is no. Further, since the protrusion of the take-up side clutch gear locking member is provided integrally with the idler base of the oscillating Fidra gear, the movement of the pinch roller arm is not used, so a link mechanism is not required, and the number of parts can be reduced.

〔Effect of the invention〕

As described above, the magnetic recording/reproducing apparatus of the present invention has a simple structure, reduces the number of parts, and when the cassette is taken out after the recording operation and the cassette is loaded again, the last part of the previous recording is reliably placed in the place where the next recording will be. This has the effect that K can be adjusted so that

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the magnetic recording and reproducing apparatus of the present invention;
2 and 6 are respectively explanatory views of the reel stand drive unit in the unloading and rope ink state of FIG. 1, and FIG. 4 is a detailed perspective view of section A in FIG. 2. 2a...supply side reel stand, 2b...take-up side reel stand, 3a...supply side clutch gear, 3b...take-up side clutch gear, 4...oscillation 9 idler, 5...・
Idler base, 6... Capstan motor, 9...
...Protrusion, 10... Cylinder. Figure l Figure 2 Figure 3b

Claims (1)

[Claims] 1. A supply side clutch gear having a sliding mechanism that meshes with the supply side reel stand, a take-up side clutch gear having a sliding mechanism that meshes with the take-up side reel stand, and the above-mentioned supply side clutch gear supported by the idler base and driven by the carbstan motor. It has a clutch gear and an oscillating idler gear formed to be able to swing and engage with the take-up side clutch gear, and the tape in the magnetic tape cassette is loaded and unloaded into a cylinder on which a rotating magnetic head is mounted. In the idler base, a protrusion that engages with the take-up side clutch gear and stops rotation of the take-up side clutch gear when the supply side reel stand of the unloading unit is driven is provided on the idler base. A magnetic recording/reproducing device characterized in that it is provided in a.