JPS6355143B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape guide device employed in a video tape recorder or the like, and particularly to an improvement in the positioning structure of a guide holder included in the tape guide device.

In a video tape recorder or the like, it is necessary to pull out a tape from a cassette, move it to a predetermined position on a rotating drum equipped with a magnetic head, accurately position the tape, and wind it around the rotating drum. For this reason, tape guide devices are employed in such video tape recorders and the like.

FIG. 1 is a plan view showing a conventional tape guide device. As shown in this drawing, the tape guide device includes tape guide parts 1a and 1b, which are guided through slide holders 4a and 4b that move along elongated holes 3a and 3b provided in a drum base 2. You will be guided to your location. Slide holder 4
Guide holders 6a and 6b are attached to a and 4b with screws 5a and 5b. Screws 5a, 5
b, the guide holders 6a, 6b are attached to the slide holders 4a, 4b in a state where they are received in elongated holes 7a, 7b provided in the guide holders 6a, 6b. Slant poles 9a, 9b are provided on the guide holders 6a, 6b in order to wind the tape at predetermined positions around the rotating drum 8 equipped with a magnetic head. Further, in order to position the tape guide portions 1a, 1b at predetermined positions relative to the stoppers 10a, 10b, a pin 11 is provided.
a and 11b are provided on the guide holders 6a and 6b.

In order to position the tape guide parts 1a, 1b in this way, the slide holders 4a, 4b are aligned with the elongated holes 3a, 3.
The pins 11a and 11b are positioned in the width direction of this elongated hole with respect to the stoppers 10a and 11b.
10b. In such positioning, the inclinations of the slant poles 9a and 9b are particularly determined by adjusting the set angles Aa and 9b.
It is important to adjust to Ab.

However, such conventional devices have the following drawbacks in adjusting the inclinations of the slant poles 9a, 9b. That is, since each part is a die-cast product, in order to adjust the inclination of the slant poles 9a, 9b fixed to the guide holders 6a, 6b, a jig or the like is used during assembly to adjust the inclination of the guide holders 6a, 6b.
It is necessary to adjust the positions of the screws 5a, 5b that attach the slide holders 6b to the slide holders 4a, 4b within the elongated holes 7a, 7b, and such work is extremely complicated.

Therefore, the main object of the present invention is to provide a tape guide device that does not require the adjustment of the inclination of the slant pole, which involves complicated work using the above-mentioned jig, etc., and that allows for reliable positioning. be.

Simply put, this invention provides a reference surface on a part of the guide holder, and a positioning pin that corresponds to this reference surface on the drum base, so that the guide holder is forced against the positioning pin by the reference surface. This is a tape guide device that allows for precise positioning.

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

FIG. 2 is a plan view of an embodiment of the present invention.
In FIG. 2, parts corresponding to those shown in FIG. 1 are given the same reference numerals, and in order to avoid duplication of explanation, only the features of this embodiment will be described below.

First, the positioning pin 12 is attached to the drum base 2.
a, 12b are provided. This positioning pin 12
Guide holders 6 correspond to a and 12b, respectively.
Reference planes 13a and 13b are provided at a and 6b. Although not shown, guide holders 6a, 6
A biasing force in the directions of arrows Ba and Bb is applied to b by appropriate links. Moreover, the slide holders 4a, 4b are arranged with a margin in the elongated holes 3a, 3b, and the slide holders 4a, 4b are arranged with a margin, and
It is designed to ensure that the reference surfaces 13a, 13b come into contact with the positioning pins 12a, 12b by the directional force. And guide holders 6a, 6b
is attached to the slide holder 4a by screws 5a and 5b.
4b, but in order to receive screws 5a, 5b, elongated holes 7a, 7 as shown in FIG.
b is not formed.

In such a configuration, the tape guide section 1
The positioning of a and 1b is carried out by the pins 11a and 11b coming into contact with the stoppers 10a and 10b, and the reference surfaces 13a and 13b coming into contact with the positioning pins 12a and 12b.
This is achieved by contacting the

In a video tape recorder etc., the tape guide parts 1a, 1b have elongated holes 3a, 3b indicated by the arrow Ca.
When the pins 11a and 11b of the guide holders 6a and 6b come into contact with the stoppers 10a and 10b by moving in the Cb direction, the recording and playback state is entered. In this state, the guide holders 6a and 6b are aligned with the arrow Ba,
Since it is biased in the Bb direction, the reference plane 13a,
When the slant poles 13b come into contact with the positioning pins 12a, 12b, the inclinations of the slant poles 9a, 9b fixed to the guide holders 6a, 6b are inevitably set to Aa, Ab. In other words, the guide holders 6a, 6b are aligned with the reference surfaces 13a, 13b relative to the positioning pins 12a, 12b.
This means that the position cannot be determined by anything else.

As described above, according to the present invention, since the drum base is provided with the positioning pin and the guide holder is provided with the reference surface, the structure is simple and does not require complicated angle adjustment using jigs or the like during assembly. A tape guide device that can perform reliable positioning without having to carry out the above operations can be obtained. Also,
It is not necessary to process the hole to receive a screw for attaching the slide holder to the guide holder into an elongated hole as in the conventional case.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a conventional tape guide device. FIG. 2 is a plan view showing an embodiment of the present invention. In the figure, 1a and 1b are tape guide parts, 2
is a drum base, 6a, 6b are guide holders, 8
is a rotating drum, 12a and 12b are positioning pins,
13a and 13b are reference planes.

Claims (1)

[Scope of Claims] 1. A tape guide device for pulling out a tape from a cassette and winding it around a rotating drum having a magnetic head at a predetermined position. A tape guide device characterized in that a guide holder is provided with a reference surface so that the holder is positioned.