JPS62102458A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate a review torque loss and to exactly control a magnetic tape by giving an appropriate brake force to a reel turn table on a winding side at the time of unloading and releasing the force at the time of reviewing. CONSTITUTION:At the time of unloading, a gear 4b is engaged with a clutch gear 3a at a supply side, and a supply side reel turn table 2a is rotated to wind a tape without slack. Simultaneously a clutch 3b stops the winding side reel turn table 2b, whereby consecutive recording can be attained when the tape is again loaded after recording is interrupted. At the time of reviewing a latch claw 9a is turned counterclockwise to release the brake force of the reel turn table 2b, whereby the review torque loss is eliminated to improve the torque efficiency. Accordingly a simple constitution can properly control a magnetic tape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic recording and reproducing apparatus equipped with a braking device for a reel stand during an unloading operation and a review operation of a magnetic tape.

[Background of the invention]

In conventional recording/playback devices such as VTRs, when recording is interrupted and the tape cassette is removed, the tape cassette is inserted again and the magnetic tape is loaded, the last position of the previously recorded portion is set as the recording start position. So that
In other words, continuous shooting is possible. Therefore, in the loading/unloading operation of magnetic tape, if a configuration is adopted in which a weak braking force is applied to the supply side reel stand and a large braking force is applied to the take-up side reel stand, the above-mentioned continuous shooting condition is met. The condition that the last position of the recording becomes the starting position of the next recording can be satisfied.

Specifically, as described in Japanese Utility Model Application Publication No. 58-26751, a system is adopted in which the magnetic tape is wound on a supply reel during the unloading operation of the magnetic tape, and the magnetic tape is fed out during the loading operation. ,
In particular, the take-up reel is braked to prevent the magnetic tape from being unwound from the take-up reel during the unloading operation.

Conventionally, the braking of the take-up reel during the unloading operation has been configured to be set in synchronization with the movement of the pinch roller arm, resulting in a large number of parts and a complex mechanism. In addition, even in a structure in which a take-up reel stand locking member is provided integrally with the idler of the present invention, which will be described later, the idler engages with the supply reel stand during review operation, so the take-up reel stand is Since the braking force and the winding torque act as a braking force, there is a problem in that the beetle cross becomes excessive.

With a simple configuration, the optimal braking force is applied to the take-up reel stand during unloading, and this braking force is released during review operation, allowing accurate control of the magnetic tape during loading/unloading operations. An object of the present invention is to provide a magnetic recording/reproducing device that enables the above-mentioned magnetic recording and reproducing operations.

[Summary of the invention]

In order to achieve this object, the present invention provides an oscillating rail idler that transmits rotation to the supply reel stand during unloading and review operations of the magnetic tape, and transfers the magnetic tape loaded into the rotating cylinder into the tape cassette. A member that locks the rotation of the take-up reel stand via a sliding mechanism to prevent the F1 magnetic tape from cracking during unloading, and a member that locks the rotation of the F1 magnetic tape through a sliding mechanism when unloading the F1 magnetic tape. When sending a magnetic tape at double speed, it has a double structure with a member that prevents the take-up υ reel stand from locking, and these two members are regulated by a spring.
During unloading, it moves in synchronization with the oscillating idler, and during review, the claw that locks the take-up reel is released from the take-up reel using a slider or arm separately from the oscillating idler. It is distinctive in that it did so.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of the mechanism of the magnetic recording/reproducing apparatus according to the present invention, in which 1 is a chassis, 2a is a supply reel stand, 2A is a take-up reel stand, and 6α is a torque limiter. Supply side clutch gear, 3b is a take-up side clutch gear with a torque limiter, 4α (4h) is an idler gear, 5 is a capstan motor, 6 is a capstan shaft, 7 is a pinch roller, 10 is a rotating unit equipped with a magnetic head. It is a cylinder.

In the figure, each element is installed on a chassis 1, and a supply side reel stand 2a and a supply side clutch gear having a torque limiter, and a take-up side reel 2b and a take-up side clutch gear 3b having a torque limiter are always engaged. ing.

The idler gear 4α oscillates and engages with the clutch gears 6α and 3b without going through a torque limiter to transmit rotation for fast forwarding and rewinding of the reel stands 2a and 2h. The idler gear 4A meshes with the clutch gears 3α and 3A via a torque limiter and transmits rotation during constant speed running and review/cue operations. Rotation is transmitted to the five capstan motor idlers via a belt to rotate the capstan shaft 6. The magnetic tape is located between the capstan provided on the capstan shaft 6 and the pinch roller 7, and during play operation, the magnetic tape is placed between the capstan provided on the capstan shaft 6 and the pinch roller 7.
It is driven and driven by crushing the capstan with a predetermined pressure.

2 is a side view showing the reel table rotation drive section in FIG. 1, in which the same reference numerals as in FIG. 1 indicate the same parts;
is the base.

In the figure, an idler 4a transmits rotation during fast forwarding and rewinding operations, and an idler 4b transmits rotation during constant speed forwarding and cue/review operations. The clutch gears 3a, 5j and the idlers 4α, 4b are arranged on a base 15 of the mold, and the base 15 is fixed to the chassis 1. The idler 4b is the capstan motor 5
(Fig. 1) is driven via a belt.

Next, the operation of the configuration of the above embodiment will be explained.

Figures 3 and 4 are explanatory diagrams of the operation of the take-up reel stand locking member during unloading/loading operations, and Figures 5 and 6 are illustrations of the take-up reel stand during review and unloading operations. 7 is a partial structural diagram (al) of a winding-side reel locking member according to the prior art for detailed explanation of the present invention, and a developed partial view (al) thereof; FIG. The same reference numerals indicate the same parts, 8 is the idler gear, 9 is the arm, 9α is the latch claw, 1) is the take-up side brake arm, 12 is the slider for releasing the latch claw 9α, 13 is the torsion spring, and 14 is the eye. The idler base 14α is a latch pawl that is integrally provided with the idler base.

In FIG. 3, the idler gear 4b is connected to the rotating cylinder I.
During the unloading operation to store the loaded magnetic tape in the tape cassette, the clutch gear 3a on the supply side engages with the gear on which the torque limiter operates, and winds the reel base on the supply side counterclockwise with a torque of about 1BOf-m.
To wind up a magnetic tape without twisting and store the magnetic tape in a tape cassette. At this time, in order to rewind the magnetic tape without any cracks, it is necessary to prevent the magnetic tape from being unwound from the take-up reel. Therefore, in this embodiment, in synchronization with the engagement of the idler 4b with the supply side clutch 6α, a latch pawl 9σ on the gear portion of the winding side clutch 3h acts as a stopper on the side where the torque limiter of the winding side clutch 3h is activated, and brakes the torque. The take-up side reel stand 2h that engages with the clutch 3b is locked at approximately -100.

In FIG. 4, since the oscillating gear portions of the idler 4b try to engage with the take-up side clutch 3.6, the locking member 12 changes the oscillating position to the take-up side clutch 3.6. It is regulated to prevent engagement with clutch 3b. After passing through the rope ink operation, the magnetic tape is loaded into the rotating cylinder 10 and runs at a constant speed, and during the play operation in which it is driven to the take-up reel, the take-up reel is moved at three times the constant speed. During the operation, the idler 4b is connected to the supply side clutch 3.
The oscillating gear parts mesh with a, and the supply side reel stand 20
transmits counterclockwise rotation to. At this time, if the configuration shown in FIG. 7 is used, the following disadvantages occur. That is, the configuration of the conventional example shown in FIG.
4 has a latch claw 14 (1 is fixed,
This latch pawl 14a bites into the gear portion of the take-up side clutch 3a, and the take-up side reel stand K10011-c! 1
Gives a braking force of about 1. However, the review torque acting on the supply side reel stand is 1 set by the supply side clutch.
Since it is approximately 8Q)-am, the review torque that actually acts is significantly reduced to approximately 80 t-m.

The review torque is 140, considering the screen noise condition.
Since t-1 or more is required, the setting torque of the latch on the supply side must take into account the loss. This poses a problem of inducing defects such as fluctuations in review torque and clutch vibration. In the present invention, as shown in FIGS. 5 and 6, the idler base 1417i
: A latch pawl 9a is provided on the arm 9 which is attached non-fixedly to the winding side clutch 5.
By forcibly removing it from b, the supply side clutch 3α
The review torque generated by 180? - It is possible to set it as it is. In FIG. 5, the cam of the slider 12 is shaped as shown in the figure, and the latch pawl 9α that has been bitten into the winding side clutch 3h is due to this cam shape.
in the direction of the arrow to release the braking force of the take-up reel stand 2b. However, to ensure stable running of the magnetic tape at the time of review, back tension was applied to the take-up reel.
It is necessary to add about #-m, so brake arm 1
] is crimped onto the take-up reel stand 26.

FIG. 6 is an explanatory diagram of the unloading operation, in which the idler base 14 and the arm 9 having the cam shape shown in the figure 45120 and the latch claw 9a operate together, and at the same time the idler gear 4b engages with the supply side clutch 3α. The latch claw 9α engages with the take-up side latch SbK, and brakes the take-up side reel stand 2h with a predetermined torque. At this time, during the review, the brake arm 1 is crimped onto the take-up reel stand 2b, and the brake arm 1] is released from the take-up reel stand 2b. The crimping operation of the brake arm 1 is in conjunction with the crimping operation of the pinch roller against the capstan.

FIG. 8 is a plan view (α) and a developed perspective view fil showing the structure of the take-up side reel stand locking member in the above embodiment, and shows an arm 9 having an idler base 14 and a latch pawl 9α.
are combined via the torsion spring 13, and
The arm 9 is urged with a predetermined load (approximately 4 to 5 f) in the direction of arrow F shown in . The arm 9 can be fully rotated in the direction opposite to the direction of the arrow F, and is configured to return to a predetermined position by the spring 13 when the force in the direction opposite to the arrow F is removed.

〔Effect of the invention〕

As explained above, according to the present invention, winding of the magnetic tape during unloading operation is performed on the supply side reel stand, and by locking the rotation of the winding υ side reel stand,
Even if the tape cassette is unloaded after a recording operation, the tape cassette is taken out, and the tape cassette is loaded again to perform a recording operation, the final part of the previous recording will not be erased. In addition, during the review operation, the braking force is released from the take-up side clutch, so there is no need to increase the review torque in anticipation of torque loss, and the efficiency of the review torque can be improved. It is possible to provide a functional magnetic recording and reproducing device.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the mechanism of the magnetic recording/reproducing device according to the present invention, Fig. 2 is a side view showing the reel table rotation drive section in Fig. 1, and Figs. 6 and 4 are unloading. / An explanatory diagram of the operation of the take-up reel stand locking member during loading operation, Figures 5 and 6 are explanatory diagrams of the operation of the take-up reel stand locking member during review and unloading operation, and Fig. 7 Figure (a) (At is a structural explanatory diagram of a take-up side IJ-le locking member according to the prior art for detailed explanation of the present invention, and Fig. 8 (cl fhl is a take-up side reel stand locking member according to the present invention). 1... Chassis 2α... Supply side reel stand 2h... Winding side reel stand 6α... Supply side clutch gear 3b... Winding side clutch gear 4α, 4A. ... Swing idler 5 ... Capstan drive motor 6 ... Capstan shaft 7 ... Pinch roller 8 ... Idler gear 9.
・Arm 10 having latch claw 9a ・Rotating cylinder 12 ・

Claims (1)

[Claims] In a magnetic recording and reproducing device that performs recording and reproduction by loading a magnetic tape from a tape cassette into a rotating cylinder equipped with a magnetic head, a neck that transmits rotation to the supply reel stand during magnetic tape unloading and review operations is used. a swing idler; and a take-up reel stand lock provided on the swing idler to lock the rotation of the take-up reel stand during an unloading operation and to release the lock of the take-up reel stand during a review operation. The magnetic tape is provided with a member, which applies an optimum braking force to the take-up reel stand during an unloading operation, releases the braking force during a review operation, eliminates review torque loss, and enables accurate control of the magnetic tape. A magnetic recording/reproducing device characterized by: