JPH02216649A - Tape guide device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of deviation from a regenerative track by deciding the perpendicularity of a guide roller with contact of cylindrical part and a holding member. CONSTITUTION:The cylindrical part is provided to an arm 4 which pivotally supports the guide roller 4a for a tape and is pivotally supported by a chassis 3. This cylindrical part is pressed by an energizing member 6 of the arm 4 against the holding member 8 fixed to the chassis 3, so as to keep the guide roller 4a vertical. Consequently, even when the arm 4 for pivotally supporting the guide roller 4a can be inclined, the guide roller 4a is always kept under the vertical state, thus making the height and course for traveling the tape constant. By this method, the occurrence of off-track, etc., can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape cassette for video or digital audio, in which a tape is pulled out from a cassette and wound onto a rotating drum to which a magnetic head is attached. This invention relates to an improvement in a tape guide device constituting a tape bus system that determines the running path of a tape in a tape recorder that performs recording and playback by rotating a rotating drum and running a tape.[Prior Art] Figure 7 shows the tape guide device that pulls out the tape from the tape cassette and forms the tape path system.
It is shown in FIG. 10 and will be explained below.

In these figures, 1 is a capstan motor 1a, which is a capstan rotated by the capstan motor, and 2 is a tape that is sandwiched between the capstan and the capstan, and the tape 5a is run at a constant speed by the rotation of the capstan 1a. The pinch roller 2a and the supporting pinch arm are the pinch roller 2a and the supporting pinch arm.

The pinch arm 2 has its shaft 2b rotatably supported by the mechanical chassis 3.

Reference numeral 4 denotes an arm that pivotally supports a guide roller 4a that pulls out the tape 5a from the tape cassette 5 and guides the tape 5a as a tape bus system, and its shaft 4b is rotatably supported by the mechanical chassis 3.

This arm 4 is provided with a spring 6 that biases the guide roller 4a in the direction of pulling out the tape 5a from the tape cassette 5.
has been erected.

A guide roller 7 is fixed to the mechanical chassis 3, and guides the tape 5a toward the guide roller 4a when the guide roller 4a pulls out the tape 5a.

In this tape guide device, when the rotation prevention of the arm 4 is released from the standby state shown in FIGS. 7 and 8 by a drive means (not shown), the arm 4 is biased by a spring 6 as shown in FIG. The guide roller 4a17 guides the tape 5a along the tape path.

At the same time, the pinch arm 2 also rotates as shown in FIG. 9, pinching the tape between the pinch arm 2a and the capstan la, and by rotating the capstan la, the tape 5a
is driven at a constant speed.

[Problem to be solved by the invention]

In the conventional tape guide device of this type, the arm 4
If the contact length between the shaft 4b and the shaft bearing part of the mechanical chassis 3 is short or there is a large play between them, the first
As shown in figure O, the guide roller 4a is tilted by θ due to the biasing force F of the spring 6.

Further, the tension of the tape 5a during running may overcome the biasing force of the spring 6, causing the guide roller 4a to tilt in a direction other than θ (FIG. 11).

This may cause the height and path of the tape 5a to become unstable, causing troubles such as playback track deviation.

[Purpose of the invention]

The present invention is intended to solve the above-mentioned problems of the conventional tape guide device.Even when the arm supporting the guide roller can be tilted, the present invention always keeps the guide roller in a vertical state and improves the tape running height and path. The purpose is to maintain a constant value and prevent track deviations from occurring.

[Summary of the invention]

The present invention relates to a means for a tape guide device for achieving the above-mentioned object, in which a cylindrical part is provided on an arm that pivotally supports a tape guide roller and is pivotally supported on a chassis, and this cylindrical part is attached to the arm. The biasing member presses the guide roller against a holding member fixed to the chassis to keep the guide roller vertical.

[Embodiments of the invention]

Next, an example of implementation of the present invention will be described with reference to FIGS. 1 to 4, in the case where it is implemented in the tape guide device shown in FIGS. 7 to 11.

Therefore, description of the same parts as in FIGS. 7 to 11 will be omitted.

As shown in FIGS. 1 and 2, the outer shape of the bearing portion 4c of the arm 4 that supports the shaft of the guide roller 4a is formed into a cylindrical shape.

A holding member 8 having a V-shaped holding groove 8a formed on its side surface is fixed to the mechanical chassis 3, as shown in FIGS. 1 and 3.

When the arm 4 rotates and pulls out the tape 5a from the tape cassette 5, the shaft bearing part 4a of the arm 4 is held in the holding groove 8a by the biasing force of the spring 6, as shown by the two-dot chain line in FIG. Being pushed.

Therefore, at this time, the shaft bearing part 4a fits into the V-shape of the holding groove 8a, and the upright angle of the shaft bearing part 4C is determined by the two vertical lines where the shaft bearing part 4a and the holding groove 8a are in contact.

Therefore, if the bearing portion 4C is made vertical due to this contact, the guide roller 4a will be vertically supported.

Furthermore, if the biasing force of the spring 6 is made large enough to overcome the running tension of the tape 5a, the guide roller 4a will not be tilted due to play between the shaft 4b and its bearing part due to the running tension of the tape 5a. .

Therefore, the guide roller 4a is always in a vertical state, and the tape 5a is prevented from being vertically displaced or undulated due to its inclination, and the tracks of the head and the tape 5a are kept in alignment.

As shown in FIGS. 5 and 6, the cylindrical portion of the shaft bearing portion 4c may be divided into upper and lower halves, and the holding groove 8a may be divided into upper and lower halves, and these halves may be brought into contact with each other.

〔Effect of the invention〕

As described above, the verticality of the guide roller is determined by the contact between the cylindrical part and the holding member, so that
The guide roller is prevented from tilting due to the short length of the bearing portion of the mechanical chassis that supports the shaft of the arm that pivotally supports the guide roller, or the large play therebetween.

Therefore, it is possible to reduce the deterioration of the space factor due to increasing the bearing length of the shaft of the arm, the increase in cost due to the high precision between the shaft and the bearing part, or the number of steps required to adjust the inclination of the guide roller.

By increasing the biasing force of the spring that presses the cylindrical part against the holding member, the guide roller is prevented from tilting due to the running tension of the tape, so the perpendicularity of the guide roller is stabilized and it is always stable. It is possible to realize tape running.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, FIG. 1 is a plan view thereof, two-dot chain lines indicate the operating state of the arm, FIG. 2 is a sectional view thereof, and FIG. 3 is a top view thereof. 1 is a sectional view of FIG. 1, FIG. 4 is a sectional view taken along the two-dot chain line in FIG. , Fig. 6 is a sectional view thereof, Fig. 7 to Fig. 11 show a conventional tape guide device, Fig. 7 is a plan view in a standby state, Fig. 8 is a sectional view thereof, and Fig. 9 is an operating state. A plan view, FIG. 10, and FIG. 11 are a plan view and a sectional view of the main parts of the same as above. 3... Mechanical chassis, 4... Arm, 4a... Guide roller, 4b... Shaft, 4c... Shaft bearing part, 5...
・Tape cassette, 5a...tape, 6...spring,
8... Holding member, 8a... Holding groove. Figure 1

Claims (1)

[Claims] In order to configure the tape path system, a guide roller is provided to guide the tape, and the guide roller is provided with a cylindrical part provided on an arm that is pivotally supported by the chassis. A tape guide device comprising: a holding member that holds the cylindrical shape; and an urging member that urges the cylindrical shape toward the holding member.