JPH04286753A - Tape loading unit - Google Patents

Abstract

PURPOSE:To facilitate the assembling of the tape loading unit. CONSTITUTION:The phase reference holes 22d and 24d of rings 22 and 24 and the phase reference hole 18b of a guide rail 18 are arranged in a straight line in accordance with object positional phase relation. The phase reference holes 22e and 24e of the rings 22 and 24 and the phase reference hole 54 of a chassis 52 are arranged in a straight line when the loading motor fixed to the chassis 52 but not shown in the figure is engaged with the peripheral teeth of the ring 24 in accordance with specified phase relation.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape loading unit, and more specifically to a tape loading unit in a helical scan type magnetic recording/reproducing apparatus using a magnetic tape as a recording medium.

0002

[Prior Art] Video tape recorder (VTR) and digital audio tape recorder (DAT)
Helical scan magnetic recording and reproducing devices such as
When loading a tape cassette, the magnetic tape is taken out from the tape cassette and wrapped around a rotating drum at a predetermined angle around the drum surface.
A loading unit is provided. For example, in the conventional 8 mm system, two guide posts guided along the rotating drum by rails placed on both sides of the rotating drum pull out the magnetic tape in the tape cassette and place it on the rotating drum at a predetermined angle. , a structure is adopted in which it is held in a wrapped state. At the end of the rail,
A mechanism is provided to hold the guide post in place.

[0003] Since the tape loading unit consists of a large number of parts and requires precise operation, each part must be arranged so that the correct positional relationship, or phase, is achieved between the parts.

0004

[Problem to be Solved by the Invention] In recent years, due to the demand for downsizing of devices, rotating drums, and thus tape loading and
There is a demand for miniaturization of units, and if individual parts are assembled while adjusting the phase relationship with other parts, assembly work efficiency becomes extremely poor.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a tape loading unit that can be assembled easily and quickly.

[0006]

[Means for Solving the Problems] A tape loading unit according to the present invention is a tape loading unit that wraps a tape member around a rotating drum at a predetermined angle using two guide posts that move in opposite directions along the rotating drum.・It is a unit, and the 1 that constitutes the unit
The present invention is characterized in that a phase reference indicating correct positional and phase relationships between predetermined parts is added to the above parts.

[0007]

[Operation] The above means makes it easy to confirm the positional and phase relationship between parts during assembly work. Further, even when a plurality of parts are assembled and then assembled into other parts, it becomes easy to adjust and check the mutual phase relationship.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an exploded perspective view of an embodiment of the present invention applied to an 8 mm VTR. 10 is an aluminum die-cast drum base that supports a rotating drum (not shown); 12 and 14 are tape bases for supporting a magnetic tape (not shown);
This is a guide post for pulling out the cassette and wrapping it around the rotating drum at a predetermined angle. drum·
The base 10 includes rail grooves 10a and 10b that guide the guide posts 12 and 14 to a specified position with the magnetic tape wrapped around the rotating drum at a predetermined angle;
Locking members 10c and 10d such as hooks for locking the guide posts 12 and 14 are formed at the ends of the guide posts 10b. The locking member 10d of the guide post 14 is formed at a deeper position than the locking member 10c of the guide post 12 in the circumferential direction of the rotating drum.

Guide rails 16 and 18 are formed by molding plastic resin, and have rail grooves 16a and 18a curved in accordance with the desired trajectory of the guide posts 12 and 14, respectively. guide merail 16
, 18, the rail grooves 16a, 18a are respectively drum-shaped.
Continuing with the rail grooves 10a and 10b of the base 10,
It is screwed to the drum base 10.

In the 8 mm method, magnetic tape is wound around a small diameter rotating drum at a large winding angle. Therefore, the running path of the magnetic tape must be greatly curved. To make this possible, the 8 mm system is further provided with a guide post 20. The guide post 20 moves along the outer peripheral surface of the guide rail 18, that is, is guided, during tape loading.

Two loading rings 22 and 24 having gears formed on their outer peripheries are stacked under the drum base 10. Although the inner diameters of the rings 22 and 24 are the same, the outer diameter of the ring 24 is larger than that of the ring 22. Three pins 26 are protruded downward from the drum base 10, and a roller 28 that slides on the inner diameter of the ring 22 is rotatably attached to each pin 26.
A roller 30 that is in sliding contact with the inner diameter of 4 is rotatably attached. This configuration allows the rings 22 and 24 to freely rotate relative to each other about the central axis of the drum base 10.

Guide post 12 is attached to ring 22 via arm 32, and guide posts 14, 20 are attached to ring 24 via arms 34, 36 and shafts 38, 40, respectively. ring 22 and arm 32, arm 32 and guide post 12, arm 34
and shaft 38, arm 36 and shaft 40, and arms 34, 36 and guide posts 14, 20 are rotatably mounted to each other. Further, the shafts 38 and 40 are passed through elongated openings formed in the ring 24 and are attached to the ring 24 so as to be movable a predetermined distance in the circumferential direction of the ring 24, and both are constantly biased counterclockwise by a spring 42. .

Two gears 46 and 48 are attached to the gear plate 44 and are meshed with each other.
It meshes with the outer teeth of No.2. Gear 48 is thinner than gear 46. The gear plate 44 is rotatably attached to a fixed member such as a chassis (not shown) about the center of rotation of the rings 22 and 24, and is biased clockwise by a spring 50. Note that when assembling the gear plate 44, make sure that the gear 48 does not hit the ring 24.
A notch 24 at a predetermined portion of the ring 24 to avoid the gear 48
c is formed.

A rotating drum (not shown) is mounted on the drum base 10 using mounting screws.
The base 10 is provided with holes for the mounting screws, and furthermore, holes are provided at predetermined rotational phase positions of the rings 22 and 24 and at corresponding positions of the gear plate 44 in order to attach and detach the rotating drum using the mounting screws. Screw holes 22a, 22
b, 24a, 24b, and 44a are open.

Further, 52 is a chassis, and 54 is a phase reference hole used for determining the phase when fixing the loading unit to the chassis 52.

Although details will be described later, the rings 22 and 24 must be interlocked in a predetermined phase relationship via gears 46 and 48. In order to easily set this phase relationship during assembly, in this embodiment, minute phase reference holes 22d and 24d are made in the rings 22 and 24, respectively, and a minute phase reference hole 18b is made in the guide rail 18. be. Further, in order to determine the phase when the assembled loading unit is fixed to the chassis 52, the rings 22 and 24 are provided with minute phase reference holes 22e and 24e.

FIG. 2 is a plan view of the loading unit when the rings 22 and 24 are assembled in phase with each other, and FIG. 3 is a rear view thereof. The gears 46 and 48 are attached to the gear plate 44 in advance in a predetermined phase relationship. Then, with the phase reference hole 18b of the guide rail 18 and the phase reference holes 22d, 24d of the rings 22, 24 arranged in a straight line, that is, with the phase reference holes 22d, 24d of the rings 22, 24 penetrating all the way to the bottom, the gears 46, 48 are connected, respectively. The gear plate 44 is attached to the drum base 10 by engaging the teeth on the outer periphery of the rings 24 and 22. This causes the rings 22 and 24 to interlock in the desired phase relationship.

FIG. 4 is a plan view of the loading unit in which parts 10 to 50 are assembled, and FIG. 5 is a rear view thereof.
Such a loading unit is fixed to the chassis 52. That is, first, the phase reference holes 22 of the rings 22 and 24 are
e, 24e and the phase reference hole 18b of the guide rail 18
Rotate the rings 22 and 24 so that they are in a straight line,
The loading unit is fixed to the chassis 52 with the phase reference hole 54 of the chassis 52 positioned on this straight line. As a result, the interlocking relationship between the loading motor (not shown) and the ring 24 is set to a desired phase.

[0020] The loading operation will be briefly explained. A loading motor (not shown) rotates the ring 24 in the counterclockwise direction shown by arrow a. This rotational force is the gear 46, 4
8 to the ring 22, and the ring 22
Rotate clockwise as shown. In response to rotation of rings 22, 24, guide posts 12, 14 move from the position shown in FIG. 4 to the position shown in FIG.
and along the rail grooves 16a, 18a of the drum base 10, and the rail grooves 10a, 10b of the drum base 10.

When the guide posts 12 and 14 reach the position shown in FIG. 2, they engage the locking members 10c and 10d, respectively.
comes into contact with. When the ring 24 further rotates counterclockwise, the guide post 14 cannot move, so the spring 42 is stretched, and its elastic force presses the guide post 14 against the locking member 10d and holds it in an immovable state. Similarly, the guide post 12 cannot be moved any further by the locking member 10c, so the rotation of the ring 22 is prevented, and the rotational force of the ring 24 causes the gears 46, 48 to rotate, and the gears 46, 48 are rotated relative to the rings 22, 24. - The plate 44 rotates (revolutions) counterclockwise, and the spring 50 is stretched. Then, the ring 22 is biased clockwise by the elastic force of the spring 50, and the guide post 12 is pressed against the locking member 10c and held in an immovable state.

On the other hand, during unloading to remove the magnetic tape from the rotating drum, the process is reversed and the guide posts 12, 14 move from the position shown in FIG. 2 to the position shown in FIG.

In this embodiment, the guide rail 18 on the tape winding side is provided with a phase reference hole 18b for determining the phase, but of course, instead of this, the guide rail 16 on the tape supply side or the drum base 10 is provided with a phase reference hole 18b. It may be provided. In addition, holes 18b, 22d, 22e, 24d, 24e,
54 was used, but it does not need to be a hole as long as it serves as a landmark.

[0024]

[Effects of the Invention] As can be easily understood from the above explanation, according to the present invention, a phase reference for determining the phase is attached to a suitable component, so assembly is facilitated, and in particular, it is possible to use small components. It is very effective in cases.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an embodiment of the present invention applied to an 8 mm VTR.

FIG. 2 is a plan view of the loading unit when the rings 22 and 24 are assembled with mutual phase alignment.

FIG. 3 is a rear view of FIG. 2.

FIG. 4 is a plan view of the assembled loading unit.

FIG. 5 is a rear view of FIG. 4.

[Explanation of symbols]

10: Drum base 10a, 10b: Rail groove
10c, 10d: Locking members 12, 14: Guide post 16, 18: Guide rail 16a, 18a
:Rail groove 18b:Phase reference hole 20:Guide・
Post 22, 24: Loading ring 22
a, 22b, 24a, 24b, 44a: Screw hole 22
d, 22e, 24d, 24e: Phase reference hole 24c:
Notch 26: Pin 28, 30: Roller 3
2, 34, 36: Arm 38, 40: Axis 42:
Spring 44: Gear plate 46, 48: Gear
50: Spring 52: Chassis 54: Phase reference hole

Claims (1)

[Claims] 1. A tape loading method in which a tape member is wound around a rotating drum at a predetermined angle by two guide posts that move in opposite directions along the rotating drum.
1. A tape loading unit characterized in that a phase reference indicating a correct positional and phase relationship between predetermined parts is added to one or more parts constituting the unit.