JPH04219663A - Tape guide device - Google Patents

Abstract

PURPOSE:To provide a means which can accurately adjust the height of a tape. CONSTITUTION:A wedge-shaped notched part 13a provided with a surface having an angle of alpha deg. with respect to a plane surface which makes a right angle with a supporting shaft 15 is formed on the outside circumferential part of a lower side flange 13, and a thin plat 16 is engaged with the part 13a of the flange 13. By turning the flange 13, the thin plate 16 is guided to the part 13a and the flange 13 is moved in a top and bottom direction.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape guide device used in a tape running adjustment mechanism of a video cassette recorder or the like.

0002

2. Description of the Related Art Generally, in a recording and reproducing apparatus such as a video cassette recorder, in order to perform recording and reproducing using a video head protruding from a rotating cylinder, a tape is wound around the rotating cylinder at a predetermined angle. Alternatively, a tape guide device is provided as an auxiliary means for storing the tape in the tape cassette.

The structure of a conventional tape guide device will be explained below. FIG. 5 is a sectional view of a conventional tape guide device. In the figure, a support shaft 5 is vertically installed in the support chassis 8 by fixing means such as press fitting. A threaded portion 5a is formed at one end of the support shaft 5, and the upper flange 2 is screwed into the threaded portion 5a. On the other hand, the support shaft 5
A lower flange 3 is rotatably attached to the lower flange 3. Further, the collar 6 rotatably holds a guide member 4 which is somewhat narrower than the collar 6 and guides the tape 9 while keeping the distance between the upper flange 2 and the lower flange 3 constant. The lower flange 3 is urged upward by a compression spring 7.

The operation of the tape guide device configured as described above when adjusting the tape height will be explained.

First, when the upper flange 2 is rotated clockwise, the upper flange 2 is guided by the threaded portion 5a and moves downward, and the collar 6 resists the biasing force of the compression spring 7 in the direction A. Move and push down the lower flange 3. By this operation, the roller member 4 also moves in the direction A, and moves the tape 9 downward while maintaining its sliding surface with the tape 9. Further, when the upper flange 2 is rotated counterclockwise, the collar 6 moves in the direction B by the biasing force of the compression spring 7 and pushes up the lower flange. By this operation, the guide member 4 also moves in the direction B, and moves the tape 9 upward while maintaining the sliding surface with the tape 9. By the above-described operation, the tape height in the tape guide device is adjusted and set to a predetermined height.

[0006]

However, in the conventional configuration described above, when adjusting the tape height, the height is adjusted by screwing the upper flange into the threaded part formed on the support shaft. The problem has been that it is difficult to make minute height adjustments because the height is determined by the pitch width of the screw and the precision of the threaded engagement between the threaded portion and the flange.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a tape guide device that allows highly accurate height adjustment.

[0008]

[Means for Solving the Problems] In order to achieve this object, the tape guide device of the present invention includes a shaft, a guide member that is fitted into the shaft and guides the tape, and is located above or below the guide member, It consists of a flange member whose outer peripheral surface is formed with a surface somewhat inclined with respect to a plane perpendicular to the shaft, and a guide means that engages with the inclined surface of the flange member.

[0009]

[Operation] According to the above-described structure, the present invention uses a flange member whose outer peripheral surface is formed with a surface slightly inclined with respect to a plane perpendicular to the shaft, and a guide means that engages with the inclined surface of the flange member. Since the tape height is adjusted, the angle of one surface somewhat inclined with respect to the plane perpendicular to the shaft can be arbitrarily set, making it possible to adjust the tape height by a minute amount.

0010

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

FIG. 1 shows a sectional view of a tape guide device according to a first embodiment of the present invention. In the figure, a support shaft 15 is erected with respect to the support chassis 18 with some clearance. An upper flange 12 is attached to one end of the support shaft 15, and a lower flange 13 has a width slightly narrower than the distance between the upper flange 12 and the lower flange 13, and a guide member 14 for guiding the tape 19 is rotatably mounted. It is fixed to the support shaft 15 by fixing means such as press-fitting in a position where it can be held. A support shaft 1 is provided on the outer peripheral surface of the lower flange 13 as shown in FIG.
A wedge-shaped notch 13a is formed with a surface having an angle of α° with respect to a plane perpendicular to 5. Support chassis 18
A thin plate 16 is fixed to the holder with a set screw 17. This thin plate 16 has a wedge-shaped cutout 13 in the lower flange 13.
a, and locks the rotation of the lower flange 13 and maintains the height of the lower flange 13.

The operation of the tape guide device configured as described above when adjusting the tape height will be explained.

When the lower flange 13 is rotated, the lower flange 13 is guided by the wedge-shaped notch 13a on the outer periphery of the lower flange 13 and moves in the vertical direction. At the same time, the support shaft 15, the upper flange 12 and the guide member 14
The height of the tape 19 is adjusted by moving the tape 19 in the vertical direction.

FIG. 3 shows a sectional view of a tape guide device according to a second embodiment of the present invention.

Components with the same numbers as in the first embodiment have the same functions, and their explanation will be omitted. Lower flange 20
is fixed to the support shaft 15 by fixing means such as press-fitting in a position where the guide member 14 that guides the tape 19 can be rotatably held with a width slightly narrower than the interval between the upper flange 12 and the lower flange 20. There is. As shown in FIG.
It is formed at an angle of α° to a plane perpendicular to . The thin plate 16 engages with the protrusion 20a of the lower flange 20, and counteracts the spring force of the compression spring 21 to stop the rotation of the lower flange 20 and to reduce the height of the lower flange 20. keeping.

The operation of the tape guide device configured as described above when adjusting the tape height will be explained.

When the lower flange 20 is rotated, the lower flange 20 is guided by the protrusion 20a of the lower flange 20.
moves in the vertical direction against the spring force of the compression spring 21. At the same time, the support shaft 15, upper flange 12, and guide member 14 are also moved in the vertical direction to adjust the height of the tape 19.

[0018]

[Effects of the Invention] The tape guide device of the present invention allows arbitrary tape height adjustment to be made using the guide means that engages with the inclined surface of the flange member. becomes stable.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a tape guide device in a first embodiment of the present invention.

[Fig. 2] Side view of the height adjustment member of the tape guide device of the same embodiment.

[Fig. 3] Side sectional view of main parts of a tape guide device in another embodiment

FIG. 4 is a side view of the height adjustment member of the tape guide device in the embodiment of FIG. 3;

[Figure 5] Side sectional view of a conventional tape guide device

[Explanation of symbols]

11 Tape guide device 12 Upper flange 13 Lower flange 14 Guide member 15 Support shaft

Claims (1)

[Claims] 1. A shaft, a guide member that is fitted into the shaft and guides the tape, and a surface that is located above or below the guide member and that is slightly inclined with respect to a plane perpendicular to the shaft, on the outer peripheral surface. A tape guide device comprising a formed flange member and guide means that engages with an inclined surface of the flange member.