JPS6058535B2 - tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder equipped with a pair of one-way clutches.

In conventionally known tape recorders, the tape is rewinded by switching the idler using an idler switching mechanism and driving the take-up reel by reversing the motor.

Known tape recorders that switch the idler in a conventional manner require an idler switching mechanism, resulting in a larger structure.
It has the disadvantage of complicating things. JP-A-50-10606 is known as a tape recorder equipped with a one-way clutch to eliminate the idler switching mechanism. This tape recorder employs a dual capstan system, with a first belt stretched between each capstan wheel and the motor pulley, and a pair of reels fitted with a one-way clutch and the motor pulley. Constant speed drive and rewinding are possible by driving the second belt stretched between the belts in a predetermined direction by forward and reverse rotation of the motor. Such a belt drive requires the belt to have a certain thickness, making it difficult to reduce the thickness of the belt, and has the disadvantage of poor low-temperature characteristics. Furthermore, since it uses two belts and employs a dual capstan system, it has the disadvantage of having a large number of parts, making the structure larger and more complex. The object of the present invention is to provide a tape recorder that is equipped with a one-way clutch, eliminates the idler switching mechanism, and can be made thinner and smaller.

In order to achieve this object, one embodiment of the present invention employs a center capstan system and is equipped with a power transmission mechanism consisting of a gear train.

An embodiment of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, a tape recorder 1 according to the present invention
0 is a "reel mechanism 1" equipped with a pair of reels 12 and 112
It is equipped with 4.

Needless to say, the reels 12 and 112 change to the supply side or the winding side depending on the rotational direction of the motor.

Regarding the configuration of the supply side reel 12 during forward running, as shown in FIGS. 2 and 3, the reel 12 is a flanged reel shaft with a thread cut at the upper end and a slit formed therein. 16, and a reel stand 20 which has a key fitted into a slit in the reel shaft and is attached to the reel shaft via a one-way clutch 18.
and have. Then, on the outer periphery of the reel stand 20, N, S
A pulse generating magnetic ring 22 having alternating poles is attached. A magnetically sensitive element 23 (see FIG. 1) that senses variations in the magnetic force of the magnetic ring 22 is arranged opposite the magnetic ring 22. Further, a drive pawl 26 is screwed into the externally threaded portion of the reel shaft 16 via a compression spring 24. Here, the reel shaft 16 is loosely fitted around the outer periphery of a gear shaft 29 of a reel gear 28 that constitutes a part of a power transmission mechanism 33, which will be described later. The reel gear 28 is fixed to a gear shaft 29 via a collar 30, and the shaft 2
The reel stand 12 is fixed to the chassis 34 by screwing a nut 32 onto the male threaded portion of the lower end of the reel stand 9 . An E ring 38 is inserted into the annular groove 36 at the free end of this gear shaft 29.
By attaching the reel stand 20 to the reel shaft 1
It is attached to 6. The one-way clutch 18 includes a clutch plate 40 in which three spiral notches are equiangularly formed on the outer periphery, a felt plate 42 disposed between the clutch plate and the reel stand 20, and a clutch plate 40. Three steel balls 44 are respectively disposed within the spiral notches. These steel balls 44 are formed in a size that allows them to move freely within a gap formed between an inner circumferential surface 46 of the reel gear 28 and a notch in the clutch plate. Further, as shown in FIG. 1, the take-up reel 112 is the same as the supply reel 12 except that the spiral direction of the spiral notch in the clutch plate is opposite and that it does not have the magnet ring 22. It has the following configuration. Components of the take-up reel 112 are designated by reference numerals with 100 added to the corresponding components of the supply reel 12. The rotational force of the motor 48 is transmitted from the motor pulley 50 without passing through an idler lever or the like as in the conventional case.
The power is transmitted to the kipstand shaft 52 and the reel shafts 16, 116 via a power transmission mechanism 33 consisting of a gear train.

As shown in FIG. 1, this power transmission mechanism 33 includes a capstan gear 54 attached to a capstan shaft 52.
, a pair of reel gears 28 and 128 attached to the reel shafts 16 and 116, and an intermediate gear 56. The rotational force of the motor 48 is transmitted from the motor pulley 1J50 to the capstan shaft 5 via the flywheel 58.
2, and from there to the respective reel gears 28, 128 via the capstan gear 5 and intermediate gear 56. Here, a rubber tire 60 is arranged on the rim of the flywheel 58. Reference numeral 61 indicates a pinch roller. The motor pulley 50 of the motor 48 is
When rotated counterclockwise as shown in FIG. 1, the capstan shaft 52 and reel gears 28, 128 all rotate clockwise.

Considering the reel 12 on the supply side, the reel gear 28
When the steel ball 44 rotates clockwise, the inner circumferential surface 46 of the reel gear causes the steel ball 44 to escape in the direction of the larger gap and idle between the inner circumferential surface and the clutch plate 40, creating a frictional force between them. does not occur. Therefore, the clutch plate 40 does not rotate, and naturally the reel stand 20 and reel shaft 16 do not rotate. On the other hand, on the reel 112 on the take-up side, the steel ball 144 is moved in the direction of the smaller gap by the inner circumferential surface 146 of the reel gear 128, creating a wedge effect between the inner circumferential surface and the clutch plate 140. , which generates a frictional force and rotates the clutch plate 140 clockwise. Due to the rotation of the clutch plate 140, the felt plate 142
The reel stand 120 also rotates through the reel 1
12 performs a tape winding function. The other motor pulley 50
When the clutch plate 40 rotates in a clockwise direction (not shown), the clutch plate 40, reel stand 20, etc. rotate by an operation opposite to the above, and the reel stand 20 performs a tape winding function. In this way, the power transmission mechanism 33 connects the flywheel 58 and the capstan gear 5.
4, an intermediate gear 56 and reel gears 28, 128 are provided, and the corresponding reel gears 28, 128 of the reels 12, 112 on the take-up side and the supply side are rotated simultaneously. Therefore, only one of the reels to be taken up can be rotated by the one-way clutches 18 and 118, and rewinding can be easily performed by rotating the motor 48 in the reverse direction. A magnetic ring 22 that generates pulses is attached to the outer periphery of the reel stand 20. However, the motor pulley 50 can be a magnetic ring, and if configured in this way, the number of parts will be reduced and assembly will be easier. In that case, it goes without saying that the magnetic response element 23 is arranged adjacent to the motor pulley 50. As described above, according to the present invention, a tape recorder includes a flywheel and a capstan gear attached to a capstan shaft located at the center, and a reel equipped with a pair of one-way latches that operate effectively in opposite directions. The power transmission mechanism includes a pair of reel gears attached to a reel shaft of the mechanism, and an intermediate gear that meshes with the capstan gear and the pair of reel gears at the same time.

By using a one-way clutch in this way, the idler switching mechanism can be eliminated, and the center capstan is used instead of a belt drive, which is driven by a combination of gears that can be made extremely thin, so low-temperature characteristics are not an issue due to the number of parts. This facilitates thinning and miniaturization. The above-mentioned embodiments are for illustrating the present invention and are not intended to limit the present invention in any way, and all modifications and modifications within the technical scope of the present invention are also included in the present invention. Needless to say.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing the main parts of a tape recorder according to an embodiment of the present invention, and FIGS. 2 and 3 are an exploded perspective view and a vertical sectional view of a reel mechanism incorporated in the tape recorder. DESCRIPTION OF SYMBOLS 10...Tape recorder, 12,112...Reel, 14...Reel mechanism, 18,118...One-way clutch, 28,128...Reel gear, 33...
Power transmission mechanism, 48... Motor, 50... Motor pulley, 52... Capstan shaft, 54... Capstan gear, 56... Intermediate gear, 58... Flywheel.

Claims (1)

[Claims] 1. A flywheel and a capstan gear attached to a capstan shaft located at the center, and a pair of reel gears attached to a reel shaft of a reel mechanism equipped with a pair of one-way clutches that act effectively in opposite directions. and an intermediate gear that meshes with a capstan gear and a pair of reel gears at the same time.