JPS62175953A - Reel mode switching gear mechanism - Google Patents

Abstract

PURPOSE:To make increase of a driving force of a reel unnecessary without applying a useless load by releasing a pre-load brake, at the time of play, by placing the pre-load brake and a reel brake in the inside and the outside of a fast forward gear and a rewinding gear, and also, constituting them so that they are controlled by a separate control constitution, respectively. CONSTITUTION:At the time of play, a loading motor is rotated from a state that tape loading is completed, and a pinch roller is pressed against a capstan. At the same time, the first control plate 6 is driven in the upper direction, a take-up gar 5 is engaged to a winding reel 2 and a center gear 3 by an energizing force of a spring 7a, both of them are connected, the winding reel 2 rotates through the center gear 3 and the take-up gear 5, and a tape run is executed. In such case, the first control plate 6 is in the upper side, and the first brake release plate 18 is in the right side, therefore, a pre-load brake 16 turns to the center position and fixed to the same position, and a connecting gear 7 for fast forward and rewinding is also held in the center position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a reel mode switching gear mechanism provided in a digital audio tape recorder equipped with a rotary head.

[Technical Background of the Invention and Problems thereof] In recent years, with the development of digital audio technology, technology has been developed for converting analog audio signals into digital signals and recording them on tape. In this way, converting an analog signal into a digital signal requires an extremely wide exclusive frequency band, so the contact area per unit time of the magnetic head for recording or reproducing signals on tape is It needs to be widened. To achieve this, it is essential to adopt a rotating head system instead of the conventional fixed head system, and based on these conditions, various tape recorders equipped with rotating heads have been proposed. There is.

In such a rotating head type tape recorder, after loading the cassette, the tape is pulled out and wound around the rotating head.
The reel rotates as the tape is drawn out. In this case, unless a certain tension is applied to the reel, there is a risk that the tape will be pulled out too much and the tape may become loose.

On the other hand, band brakes that apply pack tension to the supply reel during play have conventionally existed, but their main purpose is to act as a tape tension servo, not to prevent the tape from loosening.

Therefore, a structure in which a preload brake for tape loading and play is provided within the same mechanism has been proposed and put into practical use.

However, when a preload brake is provided, there are many problems such as a load applied to the preload brake in addition to the band brake during play, making it necessary to increase the driving force of the reel.

[Object of the Invention] The present invention was devised in order to eliminate the drawbacks of the prior art as described above, and its purpose is to provide a tape recorder for a magnetic recording/reproducing device such as a digital audio type having a rotary head. This is achieved by providing a reel mode switching gear mechanism that eliminates the need to increase the driving force of the reel without adding unnecessary load by releasing the preload brake during play.

[Summary of the Invention] The reel mode switching gear mechanism according to the present invention includes reel brakes provided on the outside of the fast-forwarding gear and rewinding gear, and a preload brake provided on the inside of the fast-forwarding gear A7 and the rewinding gear. The preload brake is controlled by the same member as the pick-up gear that switches modes during play, and the reel brake is controlled by a separate groove.

With such a configuration, during play, the preload brake can be released at the same time as the mode is switched by meshing the pick-up gear, so no unnecessary load is applied.

[Embodiment of the Invention] An embodiment of the reel mode switching gear mechanism according to the present invention as described above will be specifically described with reference to the drawings.

*Configuration In FIGS. 1 and 2, 1 and 2 are a supply reel and a take-up reel, each of which has a gear. A center gear 3 is attached between each reel 1 and 2. The center gear A'3 is always in mesh with a reel driving gear 4 attached to the lower part of the supply reel 1 coaxially with and independently of the supply reel 1. The reel driving gear 4 is connected to a reversing type reel motor via a belt and a pulley. A pick-up gear 5 is provided between the take-up reel 2 and the center gear 3. This pick-up gear 5 is controlled via an arm 7 by a first control plate 6 that is linked to a loading motor, and during play, as shown in FIG. The arm 7, which has been released, connects the take-up reel 2 and the center gear 3 by rotating under the urging force of the spring 7a.

One end of a fast forward/rewind connecting arm 8 is attached to the center gear 3 so as to have friction, and the center gear 3 is connected to a fast forward/rewind connecting gear attached to the other end of this fast forward/rewind connecting arm 8. It is always engaged with 9. This fast forward/rewind connecting gear 9 is connected to a rewinding gear 10 meshed with each reel 1, 2 in accordance with the rotation of the fast forward/rewind connecting arm 8 in the direction of rotation of the center gear 3.
Alternatively, it meshes with either the fast feed gear 11, thereby causing the supply reel 1 or the take-up reel 2 to rotate at high speed.

A band brake 12 for applying a back tension servo during play is attached to the Zaburi reel 1, and is biased by a spring 13 in the compression direction. The band brake 12 is held in the release direction via a release member before and during tape loading, so as not to apply any extra load to the tape loading.

14 in the figure is a reel brake that presses against the fast forward gear 11 and the rewind gear 10 from the outside by the urging force of a spring 15, and 16 in the figure is a reel brake that presses against the fast forward gear 11 and the rewind gear A712 by the urging force of the spring 17. It is equipped with a preload brake that is crimped from the inside. Among these, the reel brake 14 is for applying a light friction to the fast-forward gear 11 and the rewinding gear 10 when switching between the fast-forward rewinding operation and the play operation to prevent the tape from loosening due to the switching operation, In addition, the Brilonide brake 16 is
At the time of loading and fast forwarding and rewinding, the force for pulling out the tape is relaxed to prevent the tape from becoming loose due to excessive pulling out, and at the same time, during play, the fast forwarding and rewinding connecting gear 9 is biased to the central position. In the figure, 18 indicates a first brake release plate 1 that is interlocked with the first control plate 6.
8, and when it moves to the right, the preload brake 16 is released by the suppressing portion 18a. In addition, 19 in the figure is a second control plate provided overlapping with the first control plate 6, and is interlocked with a second brake release plate 20 provided overlapping with the first brake release plate 18. ing. Second brake release plate 2
0 releases the reel brake 14 by its pressing portion 20a when moving to the right.

*Function The function of the reel mode switching gear mechanism of the present invention having the above configuration is as follows.

■During tape loading When loading a tape, the loading motor rotates at the same time as the loading of the cassette is completed, causing the left and right loading blocks to move forward and wind the tape. Along with this, the tape is pulled out from the supply reel 1 or the take-up reel 2, but at this point, the first brake release plate 18 is on the left side in the figure, so the preload brake 16 is activated by the fast winding gear 11 and the winding reel. Each reel 1 via a return gear 10
. Further, during tape loading, the second brake release plate 20 is on the right side in the figure, so the reel brake 14 is not pressed. Note that during tape loading, the band brake 12 is released from the supply reel 1 by a release member (not shown).

■During play...Figure 1 During play, from the tape loading completion state, the loading motor is rotated to press the pinch roller against the capstan. At the same time, the first control plate 6 is driven upward in the figure, so that the pick-up gear 5, which is released from its regulation, meshes with the take-up reel 2 and the center gear 3 due to the biasing force of the spring 7a. and connect the two.

At this time, the reel drive gear 4 is rotated counterclockwise by the reel motor, so the take-up reel 2 is rotated clockwise, which is the winding direction, via the center gear 3 and the pick-up gear 5, and the tape is running. It will be done.

At this time, the first control plate 6 is on the upper side in the figure, and the first control plate 6 is on the upper side in the figure.
Since the brake release plate 18 is on the right side in the figure, the preload brake 16 is rotated to the center position and fixed at the same position, and accordingly, the fast forward/rewind connecting gear 7 is also held at the center position.

Furthermore, a band brake 12 is crimped onto the sibling reel 1 and a back tension servo is applied.

■During fast forwarding and rewinding...Figure 2 During fast forwarding and rewinding, the loading motor rotates in reverse and the pinch roller separates from the capstan. At this time, the first control plays 1 to 6 move downward in the figure as shown in FIG. Take reel 2
It separates. Further, as the first control plate 6 moves, the first brake release plate 18 moves to the left, so that the preload brake 16 is pressed against the fast forward gear 11 and the rewind gear 10, respectively. Therefore, the position restriction of the fast forward/rewind connecting gear 9 is also released.

On the other hand, since the second control plate 19 moves upward in the figure and the second brake release plate 20 moves to the right,
The reel brake 14 is released by the pressing portion 20a.

That is, during fast forwarding, the reel drive gear 4' rotates clockwise, and the center gear 3 meshing with it rotates counterclockwise, so that following the above switching operation,
The fast-forward/rewind connecting arm 8 rotates clockwise due to friction with the center gear 3, the fast-forward/rewind connecting gear 9 meshes with the fast-forward gear 11, and the take-up reel 2 rotates at high speed to perform a fast-forward operation. . (FIG. 2) In this case, since the preload brake 16 is pressed, the tape does not loosen due to the switching operation and high-speed rotation.

In addition, during rewinding, the reel drive gear 4 rotates counterclockwise and the center gear 3 rotates clockwise, so that the fast forward rewinding connection gear 9 meshes with the rewinding gear 10 and the supply reel 1 is rotated. The rewinding operation is performed by rotating at high speed.

As explained above, according to this embodiment, the preload brake 16 and the reel brake 14 are arranged inside and outside the fast forward gear 1 and the rewind gear 10, and are regulated by separate control structures. , when playing,
Remove the preload brake 16, and also use the preload brake 16 during tape loading and fast forward rewinding.
Since only the player is operated, there is no unnecessary load during play unlike in the past. Therefore, reel brake 1
Even if the crimping directions in the circumferential direction of the preload brake 16 and the preload brake 16 are opposite, the preload brake 16
There is no risk of the gears being jammed.

Furthermore, in this embodiment, the first and second control plates 6.19, which control the preload brake 16 and the reel brake 14, respectively, and the first and second brake release plates 18.20 are arranged in an overlapping manner. This simplifies the configuration.

*Other embodiments The present invention is not limited to the embodiments described above, and the shapes of the preload brake and reel brake can be selected as appropriate, and the arrangement and configuration of the control members can also be changed freely.

[Effects of the Invention] As explained above, according to the present invention, in a digital audio tape recorder having a rotating head, a preload brake and a reel brake are arranged inside and outside a fast forward gear and a rewind gear, and the preload By controlling the brake with the same member as the tick-up gear, the preload brake can be released during play, and the reel can be used without adding unnecessary load or increasing the driving force of the reel. A mode switching gear mechanism can be provided.

[Brief explanation of drawings]

1 and 2 are plan views showing a reel mode switching gear mechanism according to an embodiment of the present invention, with FIG. 1 showing the mode during play and FIG. 2 showing the mode during fast forwarding. 1... Supply reel, 2... Take-up reel, 3...
... Center gear, 4... Reel drive gear, 5...
Tick-up gear, 6... first control plate, 7.
...Arm, 8...Connection arm for fast forwarding and rewinding, 9.
...Fast forward and rewind connection gear, 10...Rewind gear, 11...Fast forward gear, 12...Band brake,
13...Spring, 14...Reel brake, 1
5...Spring, 16...Preload brake,
17... Spring, 18... First brake release plate, one... Second control plate, 20...
Second brake release plate.

Claims (1)

[Scope of Claims] A reel mode switching gear mechanism used in a digital audio tape recorder equipped with a rotating head, comprising: a. A take-up reel for winding a tape during play. b. Supply reel that feeds the tape during play. c. Reel drive gear rotated by the reel motor. d, provided between the take-up reel and the supply reel;
A center gear that constantly meshes with the reel drive gear. e. A take-up gear that is provided between the center gear and the take-up reel and meshes with the center gear and the take-up reel to connect them during play. f. Rapid feed gear that constantly meshes with the take-up reel. g. Rewinding gear that constantly meshes with the supply reel. h. A fast forward/rewind connecting arm whose one end is attached to the shaft of the center gear and has friction between it and the center gear. i. A fast-forward and rewind connection that is attached to the side opposite to the center gear of the fast-forward and rewind connection arm and selectively meshes with the fast-forward gear and the rewind gear depending on the direction of rotation of the fast-forward and rewind connection arm. gear. j. Reel brakes are installed on the outside of the fast-forwarding gear and rewinding gear, and are controlled to press against each gear during play. k. Preload brakes are provided inside the fast-forwarding gear and the rewinding gear, respectively, and are controlled to press against each gear during tape loading and fast-forwarding and rewinding. l, a first control member for controlling the reel brake; m, a second control member that controls the take-up gear and the preload brake; A mode switching gear mechanism for a reel, characterized in that it is constructed from each of the members a to m above.