JPS61296555A - Tape take up device - Google Patents

Abstract

PURPOSE:To reduce number of components and to suppress the height of a reel turn table by providing a cam giving clutch torque different in response to the difference in tape take up direction to a clutch. CONSTITUTION:A spring 30 is expanded and compressed properly attended with the action of the cam comprising cam parts 22, 25, the clutch torque is made different in response to the difference in the tape take up direction so as to apply forward and reverse reproduction, no clutch is provided to a reel stand 34 and another reel stand (not shown), and forward and reverse reproduction is applied only with discs 20, 24, 27, 28, a felt 29 and a spring 30. Thus, the number of components is reduced and the manufacture cost is made cheap, the height of the reel turn table is suppressed and miniaturization is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a tape winding device provided in a VTR or the like.

[Background of the invention]

FIG. 5 is an explanatory diagram showing a schematic configuration of a VTR as an example of equipment equipped with a tape winding device. In this figure, 1 is a tape, 2 and 3 are reels on which this tape 1 is wound, 4 is a tape cassette in which the tape 1 is stored,
5 is a drum on which a recording center head is mounted and around which the tape 1 is wound; 6 is an erasing head; 7 is an audio/control head; 8 is a capstan; and 9 is a pinch roller.

In this VTR, by winding the tape 1 in the direction of arrow 10, normal rotation playback can be performed from π, and by feeding the tape 1 in the direction of arrow 11, reverse playback is also possible. By the way, generally, during the above-mentioned normal rotation, the tape 1 is given a feeding force by the capstan 8 and the pinch roller 9 and wound onto the reel 3.

Although the tape winding torque is relatively small, during reverse rotation, since the capstan and pinch roller combination is not arranged on the reel 2 side, the feeding force is not applied by these, and therefore the sliding contact of the drum 5 is Due to resistance, etc., the tape winding torque when winding onto the reel 2 increases.

Figure 6 shows a VT capable of forward and reverse playback.
FIG. 3 is a sectional view of a main part showing an example of a conventional tape winding Stt provided in R.

In this case, 12 is a reel stand on which the reel is mounted;
13 is a disc rotatable with respect to the reel stand 12; 14 is a disc that is movable up and down, and is integral with the reel stand 12;
15 is a felt placed between the discs 13 and 14, and 16 is a spring that biases the disc 13 downward. The spring 16 is arranged in the lower part of the reel stand 12 and constitutes a clutch section that limits the tape winding torque. 17 is a drive source, and 18 is an idler that transmits the rotational force of the drive source 17 to the disk 13. Incidentally, 19 is also an idler, and is capable of engaging with a disk portion 12aK provided at the upper part of the reel stand 12, that is, at a position not involved in the above-mentioned clutch portion.

Then, as shown in this yiA6 figure, the latch part is in the fifth position.
Two reel stands 1 each holding a reel 2.3
There are two springs in total, one for each spring 1.
The biasing force in step 6 is different depending on whether the regeneration is performed in normal rotation or in reverse rotation. That is, in the spring 16 provided in the clutch portion disposed on the reel 2 side in Figure @5, the biasing force is increased to increase the clutch torque, and a large tape winding torque is obtained. In addition, the biasing force of the clutch part VC @ the spring 16 disposed on the reel 3 side is reduced, and the clutch torque is reduced.
This is to obtain a small tape winding torque.

With this tape winding device, during normal rotation playback.

During reverse playback, the rotational force of the drive source 17 is selectively applied to the reel 3 side in FIG. 5 or the reel 24 via the idler 18.
JA11 K is transmitted to the disk 13 provided.

Disk 13 according to the biasing force of spring 16. The clutch torque, that is, the tape winding torque, is limited by the force exerted between the felt 15 and the disk 14, and the desired forward rotation regeneration operation or reverse rotation regeneration operation is performed.

Further, during FF and REW, the rotational force of the drive source 170 is transmitted to the reel stand 12 via the idler 19 and the disc 12a provided on the reel 3 side or the reel 2 side in the selective KtAS diagram, and the desired OFF is performed.

几W operation is performed.

However, the conventional tape winding device fIt configured in this way
Since the clutch part is provided for each reel stand 12 in the K-Atsuko, the total number of parts increases, which increases manufacturing costs, and the height of the 17-inch stand increases, making it difficult to downsize. There is a problem that is difficult to detect.

In addition, in this conventional tape winding device.

A dedicated idler 19 for FF and REW is required.

[Purpose of the invention]

The present invention has been made in view of the actual situation in the prior art, and its purpose is to provide a tape winding device that can reduce the number of parts per unit and suppress the height dimension of the reel stand. be.

[Summary of the invention]

In order to achieve this object, the present invention provides a deodorizer equipped with a clutch section that limits the tape winding torque, and the clutch section has a cam body that provides different clutch torques depending on the tape winding direction. In this way, only one latch portion is provided.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A tape winding device according to the present invention will be explained below with reference to the drawings. Figures 1 to 4 are explanatory diagrams showing one embodiment of the present invention, in which Figure 1 is a cross-sectional view of the main part, and Figure 2 is a perspective view showing a disc to which rotational force from a drive source is transmitted. , Fig. 3 is a perspective view showing a disc placed opposite to the disc shown in Fig. 2, and Fig. 4 shows a stop between the cam part shown in Fig. 2 and the cam part shown in Fig. 3. It is an explanatory diagram showing a state.

In FIG. 1, reference numeral 20 denotes a disk to which rotational force is transmitted from a drive source (not shown), and as shown in FIG. 2, it has a shaft 21 in the center and an inclined surface around this shaft 21. The cam part 22 has pins 23 at two locations on the outside of the cam part 22. Reference numeral 24 denotes a disk that is rotatably and vertically movable mounted on the shaft 21 of the disk 20, and as shown in FIG. It has a protrusion 26 that can be engaged with. The cam portion 22 and the cam portion 25 described above constitute a cam body that provides different clutch torques as described later depending on the tape winding direction.

27 is a disk placed above the disk 24 and has a rising portion on the first circumference side; 28 is a disk placed above the central portion of this disk 27; It is movable up and down by 1 with respect to the shaft 21, and is rotatable integrally with the shaft 21. 29 is a felt placed between the circle @ 24 and the center of the disk 27, and between the center of the disk 27σ) and the disk 28; 30 is a spring that urges the disk 28 downward; be. A disk 20 including the cam portion 22 described above. Disc 24 including cam portion 25. Felt 291 Disc 27, 28. A clutch section is constituted by the four housings 30 and 30.

31 is a center pulley placed above the shaft 21;
The trap is rotatable around a shaft 32 passing through the trap. Note that the above-mentioned rising portion of the circumferential side σ) of the disk 270 and the inner circumferential side of the center pulley 31 are formed in a spline connection, that is, the disk 2
7 is able to move up and down freely and rotates as one (power)℃
There is. Further, reference numeral 33 denotes a shaft that is inserted through the disk 20 so as to be able to rise and fall freely, and is a trap that can be splined to the rising portion of the disk 27 mentioned above. Reference numeral 34 indicates the reel stand 1, for example, a reel stand disposed on the side of the reel 3 shown in FIG. Alternatively, another one (not shown) located on the reel 2 side shown in FIG.
This is an idler that selectively transmits information to two reel stands.

In this embodiment, as shown in Figure S@1, the spline connection between the shaft 33 and the rising portion of the disc 27 is released, and the center pulley 31 and the reel stand 34 are connected by the idler 35. In this state, the driving source is the disk 2
0 rotates in the direction of the arrow A in FIG. The disk 24. rotates integrally with the disk 24. due to the biasing force of the spring 30. With the clutch torque limited by the frictional force between the central portion of the 29% felt disc 27 and the disc 28, the rotational force of the disc 240 is transferred to the disc 27. It is transmitted to the center pulley 31 and further transmitted to the reel stand 34 via the idler 35.

The tape is wound onto the roll 3 side in FIG. 5 described above with a winding torque corresponding to the clutch torque described above, and the desired normal rotation reproduction can be performed.

Further, with the spline connection between the shaft 33 and the rising portion of the disc 27 released, and the idler 35, the center pulley 31 is placed on the other reel stand (not shown), that is, on the side of the reel 2 in FIG. When the disc 20 is rotated in the direction of the arrow 39 in FIG. 2 by the drive source while connected to the reel stand, there is a gap between the cam portion 22 of the first disc 20 and the cam portion 25 of the disc 24 as shown in FIG. As shown, slipping occurs, which causes the cam portion 25, ie, the disk 24, to rise, and the felt 291 and disks 27, 28 to rise accordingly, causing the spring 30 to contract. That is, the biasing force applied to the disc 28Vc increases, and the clutch torque increases. In addition,
This clutch torque is limited by the deactivation of the cam portion 22.25 upon engagement of the pin 23 and the projection 26. In this state, the rotational force of the disc 240 is 1 disc 27.
This is transmitted to the center pulley 31, and further transmitted via the idler 35 to the reel stand located on the reel 2 side in Figure 5, and the tape is wound as described above with a large winding torque corresponding to the increased clutch torque. Reel 2 in Figure 5
It can be wound up on the side to perform the desired reverse playback. ``Also, in a state in which the shaft 33 shown in FIG. 1 is raised and spline-coupled with the rising portion on the circumferential side of the disk n.

When the disk 20 is rotated by the drive source, the rotational force is transmitted directly to the shaft 33, the disk 27, and the center-boot clutch section.

By selectively operating the idler 35, the rotational force is transmitted to the reel stand 34, and the reel 3 shown in FIG.
It is possible to perform an FF operation for winding the tape on the side, or a tEW operation for winding the tape on the reel 2 side in FIG.

In the embodiment configured in this manner, as described above, the spring 30 is expanded and contracted as appropriate with the operation of the cam body consisting of the cam portions 22 and 25, thereby responding to the difference in the winding direction of the tape. By changing the clutch torque, normal rotation regeneration,
In addition to being able to perform a reverse playback operation, the reel stand 34 and another reel stand (not shown) are not provided with a clutch section and have a 1-disc, 20, 24, 27, 28 degree felt 29. Forward rotation regeneration and reverse rotation regeneration operations can be carried out using only one clutch portion constituted by the spring 30. Therefore, the number of parts can be reduced, manufacturing costs can be reduced, and the height dimension of the reel stand can be reduced. can be suppressed and downsized. In addition, due to the raising and lowering operation of the shaft 33 in this embodiment or as shown in FIG.
FF.

)(, EW operation can be realized, therefore FF', REW
The structure is simple and does not require an idler for operation.In the above embodiment, the cam portion 22 has a cam body provided on the disc 20.
and a cam portion 25 provided on one disc 24, but the present invention is not limited to this, and the present invention is not limited to this. A so-called screw cam may be formed by forming a screw on the first circular plate 24 to be screwed into the screw.

Further, in the above embodiment, the clutch portion and the center pulley 31
The shaft 33 and the shaft 33 are provided almost coaxially. It is also possible to configure the reduction ratio to be different when the clutch section is in operation.

〔Effect of the invention〕

Since the tape winding device of the present invention is configured as described above, it is possible to reduce the number of parts per unit and to suppress the height dimension of the reel stand, and therefore, the manufacturing cost is lower than that of the conventional method. This has the effect of realizing miniaturization.

[Brief explanation of the drawing]

1 to 4 are explanatory diagrams showing one embodiment of the tape winding device of the present invention, in which FIG. 1 is a sectional view of the main part, and FIG. 2 is a disc to which the rotational force from the drive source is transmitted. FIG. 3 is a perspective view showing a disk placed opposite to the disk shown in FIG. 2, FIG. 4 is a perspective view showing the force shown in FIG. FIG. 5 is an explanatory diagram showing the schematic configuration of a VTR as an example of equipment equipped with a tape winding device. FIG. 6 is an explanatory diagram showing the state of engagement with the cam portion shown in FIG. 1 is a sectional view of a main part showing an example of a conventional tape winding device included in a possible VTR. 20.24.27.28...disc, 21,32
゜33...Shaft, 22, 25...Cam part, 23...Bin, 26...Protrusion part, 2
9...Felt, 30...Spring, 31
... Center pulley, 34 ... Reel stand, 35 ... Idler. Figure 1 zo 24.27. Zg ----- Enfutan 21.3
2. 33 -------・Shaft 22.25 ----One cam effort P 23- ・Pin 26・-Kuro-suppress 2q-m-・Feltzu θ----- +, l$' Ne3/ ---Pulley 34----'No Lu6] 3ff----Complete μ°Figure 2Figure 4Figure 5Figure 6

Claims (1)

[Claims] A tape winding device equipped with a clutch unit that limits the winding torque of the tape, wherein the clutch unit has a cam body that applies different clutch torques depending on the winding direction of the tape. removal device.