JPS59180843A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the load on a magnetic tape by tilting a cylinder part toward a cassette to set the tape horizontally or raise up the tape toward the inner side of a VTR, therefore, reducing the difference in tape height at the take- up side. CONSTITUTION:A magnetic tape which is drawn almost horizontally out of a cassette 9 and set at a position 20A is changed in a different direction by a tape guide 6. Then the tape is twisted by an inclined post 4, wound round an upper cylinder 34 and a lower cylinder 2 and moved down to a position 20C along the cylinder part. Furthermore the tape is changed to another direction by an inclined post 3 and a tape guide 5 and moved up toward a position 20D. Then the twist is released by an inclined post 25 for the tape 20 set at the position 20D, and the tape is stored into the cassette 9.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a magnetic recording/reproducing device.

Conventional configuration and problems thereof A conventional magnetic recording/reproducing apparatus (hereinafter referred to as a VTR) will be explained with reference to FIGS. 1 and 2. When the cassette (9) is installed in the VTR, the tape guide (5), inclined post (3), tape guide (6), and inclined post (4)
pull out the magnetic tape in the direction of the arrow, wrap the magnetic tape around the upper cylinder (1) and the lower cylinder (2), and turn the magnetic head (2) onto a rotating body (by rotating the IJ) equipped with Performs recording and playback on tape (to).

However, in order to make VTRs smaller, it is necessary to fit the cylinder into the space (E) where the tape guide closes the magnetic tape (E) of the cassette (9).
When the cassette :,,)(0) is attached to the VTR, the upper cylinder (1) and the magnetic tape) collide, making the depth of the VTR smaller than the sum of the cylinder drum diameter and the cassette size. was considered impossible.

In Figures 1 and 2, (7) and (8) are guide rollers, 00 is the supply side reel, θυ is the take-up side reel,
■An umbrella is a rotating shaft.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional technology, and provides a four-legged VTR that can further reduce the relative distance between the cullet and the upper and lower cylinders, thereby achieving further miniaturization.
．． The purpose is to

SUMMARY OF THE INVENTION In order to achieve the above object, the VTR of the present invention has a rotating shaft inclined toward the cassette side, and a magnetic head is located on a circumferential orbit around the rotating shaft and is housed in the cassette. a rotating body installed so as to pass under the magnetic tape on the body, a lower cylinder placed below the rotating body and fixed on the substrate, and a lower cylinder arranged above the rotating body and having a diameter of ;) An annular upper cylinder with a portion removed along the center direction, and when the cassette is loaded, the removed portion of the upper cylinder faces the magnetic tape, and the tape loading mode is switched to. - The cylinder is configured such that the magnetic tape is pulled out from the cassette by the tape guide and wound around the outer peripheral surface of the upper cylinder other than the deleted portion.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

8 to 9 show one embodiment of the present invention ("++" and the first
Components that are the same as those shown in the figures and FIG. FIG. 3 is a schematic configuration diagram of a VTR, in which running of the magnetic tape H is controlled by pressing a pinch roller Ijl (9 has two capstans and a pinch roller Ijl onto the capstan θ) to the magnetic tape. It is a capstan motor that performs control. (5) (6
) Oo is a tape guide that pulls out the magnetic tape (A) from the cassette (9) and fixes it in a predetermined position, Oo is a tape guide fixed on the board (1), @ is a tape guide that is fixed on the board (A)
It is a tilted post fixed to the top. Double is the upper cylinder with a deletion part (6), and when the cassette tool is 4, the deletion part (8)
is located on the cassette (9) side. Figure 4 shows the same VTR.
In the cross-sectional view of the cylinder, 01 is the lower cylinder '(2) which holds the upper cylinder → and is fixed to the base plate (A).CD
',...1) A rotating shaft rotatably supported by a receiving part 0)) and tilted toward the cassette (9) side, and has a gear (a) and a rotating motor (not shown). is connected to. (C) (To) is a transformer that transmits the output of the magnetic head 0 and 0, C is a magnet, and □ is a coil that gives rotational motion to the rotating body 04). (G) 01) is a bearing that rotatably holds the rotating body θ fat in the lower cylinder (2).

Next, the operation will be explained. When the VTR switches to the tape loading mode, the upper cylinder is rotated and fixed by the loading motor to the position shown in Fig. 5, and the tape (4) changes to position C (Fig. Figure 3,
Figure 5). Next, the loading motor is switched,
Tape guide 0 → QQ (II, inclined post (31 (4)
, and pinch roller lX! l) moves along the force path for a predetermined displacement 5 and is fixed. At this time, the rotating body (1) rotates clockwise to protect the magnetic tape during tape loading. Figures 6 and 7 show the positions of the magnetic tape handles before and after loading the tape, respectively, on the cassette (9). It is seen through from the side, and in Figure 6 the magnetic tape (
The magnetic tape (E) is located above the rotating body (141), and when the tape loading is completed (Fig. 7), the magnetic tape (E) is located above the rotating body (141).
is wrapped around the upper cylinder (A) and the lower cylinder (2) by the tape guides (5) (6) and (IQ Y' + posts (3) (4). Figure 8 shows the magnetic field when the cassette is installed in the VTR. Figure 9 shows the positional relationship between the cylinder section and magnetic tape 0) when tape loading is completed.
) The magnetic tape (E) at position (7) is pulled out almost underwater from (20A), is changed direction by the tape guide (6), twisted by the inclined post (4), and then moved to the upper cylinder (B). and wrapped around the lower cylinder (2), (
Go down along the cylinder part to position 20C).

Further, the direction is changed by the inclined post (3) and tape guide (5), and the magnetic tape (A) rises in the direction of (20D), and the magnetic tape (E) at the position of (20D) is moved by the inclined post. The twist is removed and the cassette (9
).

As described above, according to the present invention, the first annular upper cylinder is partially removed along the center direction, and when the cassette is loaded, the magnetic tape and the upper cylinder are removed. The tape loading is completed after the upper cylinder rotates 1-1 in the loading mode to the point where the outer peripheral surface other than the deleted portion comes into contact with the magnetic tape without interfering with the cylinder. The distance between the cassette and the cylinder can be reduced, and the device can be made smaller. In addition, when installing the skein and throat, the magnetic head is placed in a position lower than the bottom edge of the magnetic tape. When tape loading is completed, the height of the magnetic tape is adjusted with the inclined post.
Just by providing a relief of one core tape on the upper cylinder only,
The motor section of the cylinder can be arranged in the conventional manner, and furthermore, the cylinder is fixed on the substrate as in the conventional manner, so that the configuration can be made stable in terms of accuracy. Also, by integrating the cylinder part into the cassette 1-(11!l) in the traveling direction of the magnetic tape at the position where the magnetic tape leaves the lower cylinder, the magnetic tape can be raised horizontally or toward the depth of the VTR. Since the tape height difference on the magnetic tape winding side is reduced, the negative J knee I for the magnetic tape can be reduced.
Even if the height difference between the rotating body containing the magnetic head and the center of the magnetic tape in the cassette is set small, the VTR is switched to loading mode and the upper cylinder rotates.
Since a sufficient height difference between the magnetic tape and the magnetic head when the magnetic tape is in contact with the upper cylinder can be ensured, the thickness of the VFR can be set small.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view of a conventional VTR in a tape loading state, Fig. 2 (a) is a schematic plan view of the cylinder section of the same VTR, Fig. 3 is a schematic plan view of a VTR according to an embodiment of the present invention when the cassette is installed, FIG. 4 (A) is a schematic plan view of the cylinder section of the VTR, FIG. The figure is a schematic plan S diagram of the same VTR in the tape loading state, an explanatory diagram showing the positional relationship between the magnetic tape and the cylinder when the cassettes of the 6UA and 8th VTR are installed, and FIGS. 7 and 9 are of the same VTR. It is an explanatory diagram showing the positional relationship between the magnetic tape and the cylinder when tape loading is completed. (2)...lower cylinder, (9)...cassette, (403rd...magnetic head, 04)...・Rotating body, kiln...
・Magnetic tape, (c)...Substrate, ((÷...upper cylinder agent Yoshihiro Morimoto Figure 1 Figure 2 (42) Figure 3 5 Figure 4 (4) Figure 5 Figure 1 Figure 1

Claims (1)

[Claims] 1. It has a rotating shaft inclined toward the cassette side, and is installed so that the magnetic head is located on a circumferential orbit centered on the rotating shaft and passes under the magnetic tape stored in the cassette. a rotating body, a lower cylinder placed below the rotating body and fixed on the substrate, and an annular upper cylinder placed above the rotating body and having a portion removed along the axial direction. When the cassette is loaded, the removed portion of the upper cylinder and the magnetic tape face each other, and when the tape loading mode is switched, the outer peripheral surface of the upper cylinder other than the removed portion comes into contact with the magnetic tape i1. '
The magnetic recording/reproducing device is configured such that the magnetic tape is rotated to a predetermined position and fixed, and then the magnetic tape is pulled out from the cassette by a tape guide and wound around the outer peripheral surface of the upper cylinder other than the removed portion. Device.