JPS61239454A - Motive power transmitting mechanism for tape take-up driver of tape recorder - Google Patents

Abstract

PURPOSE:To break the transmission of drive power at the final stage of rapid traverse or rewinding mode of a tape by providing the rapid traversing and rewinding gears of large diameters separately from an operating pulley to attach them to a shaft with an operating shaft defined as an axial core and providing a clutch between both gears and the pulley for connection. CONSTITUTION:When an operating pulley 6 is rotated, an operating shaft 3 coupled to the pulley 6 via a clutch 10 is rotated. Then a recording/reproduction driving gear 14 of a small diameter is rotated. Thus the drive power of the pulley 6 is transmitted in the form of the drive power for recording/reproduction of a tape by connecting a recording/reproduction gear system to the gear 14. When the tape is not fed any more at the final stage of the tape recording or reproducing mode, the load is applied to the shaft 3. Then the transmission of the drive power is cut off between the pulley 6 and the clutch 10. This prevents the large tension applied to the pulley 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a power transmission mechanism in a tape winding drive device for recording, reproducing, or fast forwarding and rewinding a tape recorder.

(Prior art) A small-diameter recording and playback driving gear is provided on the operating shaft that rotates in response to the rotational force of the operating pulley.

It is possible to record a tape to the playback drive gear, connect the playback feed gear system, and switch it out and record the tape while connected.
While performing regenerative feeding, a large-diameter fast-forward and rewind drive gear is integrally provided on the operating pulley, and a fast-forward gear system or a rewind gear system is connected to the large-diameter fast-forward and rewind drive gear. A power transmission mechanism that can be switched between connection and disconnection, and in which the tape is fast-forwarded or wrapped in the connected state, is known.

When recording or playing back a tape, it must be fed at a constant speed, regardless of the size of the winding diameter of the tape. Therefore, the tape is fed at a constant speed by the action of the capstan shaft and pinch roller, and the difference in rotational speed between the tape take-up reel receiver and the operating pulley is absorbed by the clutch interposed between the operating pulley and the operating shaft. That's what I do.

(Problem to be Solved by the Invention) When recording and playing back a tape, a clutch is interposed between the operating pulley and the operating shaft as described above, so the clutch is interposed between the operating pulley and the operating shaft. However, the operating pulley rotates idly and does not apply enough tension to the tape to damage the tape.

On the other hand, even when the tape is being fast-forwarded or rewound, a large tension is applied to the tape at the end of the tape winding, and the force that causes damage to the tape must be absorbed.

Some high-end tape recorders are equipped with a clutch on the side of the tape take-up reel holder to prevent large tension from being applied to the tape at the end during fast forwarding or rewinding operations. Generally, tape recorders that are not high-end machines are not equipped with this clutch. In other words, if this clutch is installed, the number of parts increases, the time and effort required to assemble it, and the price cannot be reduced.The relatively large tension applied during fast forwarding or rewinding weakens the tape to the extent that it does not break. This was considered to be unavoidable.

In view of the above-mentioned problems of the previously known power transmission mechanism, the present invention provides fast forwarding without significantly increasing the number of parts and without increasing the labor during assembly, that is, without increasing the price even if it is not a high-end machine. Another object of the present invention is to provide a novel power transmission mechanism that can prevent large tension from being applied to the tape at the final point of rewinding.

(Means for Solving the Problem) For this purpose, in the present invention, a clutch is interposed at one end of the operating shaft penetrating the operating pulley to connect the operating pulley and the operating shaft, and a small diameter While the recording and playback drive gears are fixed, a large-diameter fast-forward 1-rewind drive gear is constructed separately from the operating pulley, and this fast-forward 2-rewind drive gear is rotated around the operating shaft. It is characterized in that it is equipped with a clutch and is connected to the operating pulley with a clutch interposed between it.

(Function) In this invention, the rotational force of the pulley is transmitted to the operating shaft via the clutch, and rotates a small-diameter recording/playback drive gear fixed to the other end of the operating shaft.

Therefore, when a load is applied to the recording/playback drive gear, the clutch cuts off the power transmission.

Similarly, the rotational force of the pulley is transmitted via the clutch to the large-diameter fast forward 1 winding and return driving gear, and rotates the fast forwarding 2 winding rewind driving gear. Therefore, if a load is applied to this fast forward/rewind drive gear, the power transmission will be cut off by the clutch.

(Example) The present invention will be described in detail below with reference to preferred embodiments shown in the drawings.

In the figure, reference numeral 1 denotes an operating arm, and an operating shaft 3 rotatably passes through a bearing hole 2 of the operating arm. This operating arm 1 has a cylindrical portion 4 shaped to enclose a gear for driving fast forwarding and rewinding, which will be described later, as well as a known one. and a window opening 5 for allowing connection with a fast forwarding gear system or a rewinding gear system (not shown).
5.

Reference numeral 6 denotes an operating pulley, through which the operating shaft 3 passes through a central shaft hole 8 formed in its central cylinder 7. A clutch plate 11 is attached to one end 9 of the operating shaft 3 protruding from the operating pulley 6.
A clutch felt 12 that comes into contact with the pulley 6 is fixed to the clutch plate 11, thereby forming a friction clutch 10. And this clutch 1o
The operation boot IJ-6 and the operation shaft 3 are connected through the.

On the other hand, the other end 13 of the operating shaft 3 protrudes from the operating arm 1.
A small-diameter recording/playback drive gear 14 is fixedly attached to the main body.

Furthermore, 15 in the figure is a large diameter fast forward 2 rewind drive gear,
In the present invention, this gear 15 is connected to an operating pulley 6 as shown in the figure.
It is configured separately from the . In the embodiment shown in FIGS. 1 and 2, the gear 15 is pivotally supported on the center cylinder 7 of the operating pulley 6 in order to be mounted around the operating shaft 3.

A clutch plate 1) is also provided on this large-diameter fast forward 2 rewind driving gear 15, and a clutch felt 18 is fixed to this to constitute a friction clutch 16.
is brought into contact with the operating pulley 6.

In the figure, reference numeral 19 denotes a spring for maintaining pressure contact between each of the friction clutches 10 and 16 and the operating pulley 6, and a clutch between the spring receiver 20 attached to the operating shaft 3 and the large-diameter fast-forwarding and rewinding drive gear 15. It is interposed between the plate 1).

Another embodiment of the invention is shown in FIGS. 3 and 4, in which parts designated by the same reference numerals as in FIGS. 1 and 2 represent the same parts. That is, the embodiment shown in FIGS. 3 and 4 has a large-diameter fast-forwarding gear 15 and
Clutch 21 interposed between
This is a dog clutch instead of a friction clutch.

For this purpose, tooth-shaped protrusions 22 and 23 are provided on opposing surfaces of the gear 15 and the pulley 6, respectively.

The operation of the mechanism of the present invention having such a configuration will be explained below.

In each of the embodiments shown in FIGS. 1 and 3, when the operating pulley -6 rotates, the operating shaft 3 connected to it through the clutch 10 rotates, and is used for small-diameter recording and playback driving. Gear 14 rotates. Therefore, if a tape recording/playback feeding gear system (not shown) is connected to this gear 14, the driving force of the operating pulley is transmitted as the driving force for tape recording/playback feeding. When the tape stops being fed out at the end of tape recording or playback,
A load is applied to the operating shaft 3, and the operating pulley 6 and clutch 1
0, the transmission of driving force is cut off, and no large tension is applied to the tape.

Similarly, when the operation pulley 6 rotates, the large-diameter fast-forwarding and rewinding drive gear 15, which is connected to it via the clutch 16 or 21, rotates. Therefore, if a fast-forward gear system or a rewind gear system (not shown) is connected to this large-diameter fast-forward and rewind drive gear 15, the driving force of the operation pulley is transmitted as the driving force for fast-forwarding or rewinding the tape. and the tape is driven in fast forward or rewind. When the tape is no longer being fed out at the end of tape fast forwarding or rewinding, a load is applied to the gear 15, and the transmission of driving force is cut off between the operating pulley 6 and the clutch 16 or 21, causing a large tension to be applied to the tape. I won't give it.

(Effect of the invention) As mentioned above, the mechanism of the present invention provides large-diameter fast forwarding.

The rewind drive gear is configured separately from the operating pulley, and this large diameter drive gear is mounted around the operating shaft, and is linked to the operating pulley by interposing a clutch.
Even during fast forwarding or rewinding of the tape, transmission of the driving force is cut off at the end, eliminating the need to apply large tension to the tape. In particular, in the present invention, a clutch is interposed between the large-diameter fast-forwarding, two-rewinding drive gear and the operating pulley, so the tape reel holder can be used without a special clutch mechanism on the side.
This system is designed to absorb the load at the end of fast-forwarding or rewinding the tape, using a structure that is not significantly different from the power transmission mechanism of conventional, non-high-end tape recorders. As a result, there is no significant increase in the number of parts or the number of assembly steps, and this has the great effect that even non-high-end machines can have the same functions as high-end machines at a low price.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the present invention; FIG. 1 is a sectional view of one of the embodiments, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a sectional view of another embodiment, and FIG. is also an exploded slope view.

Claims (3)

[Claims] (1) A clutch is interposed at one end of the operating shaft that penetrates the operating pulley to connect the operating pulley and the operating shaft, and a small-diameter recording/playback drive gear is fixed to the other end of the operating shaft, while a large The gear for driving the rapid forwarding and rewinding of the diameter is constructed separately from the operating pulley, and the gear for driving the rapid forwarding and rewinding is mounted around the operating shaft, and a clutch is interposed between it and the operating pulley. A power transmission mechanism in a tape winding drive device of a tape recorder, characterized in that the power transmission mechanism is connected in a tape winding drive device of a tape recorder. (2) The clutch between the operating pulley and the operating shaft as well as the clutch between the operating pulley and the fast-forwarding and rewinding drive gears are both friction clutches ( The power transmission mechanism according to item 1). (3) The clutch between the operating pulley and the operating shaft is a friction clutch, and the clutch between the operating pulley and the fast forward/rewind drive gear is a dog clutch. The power transmission mechanism described in (1).