JPH04345950A - Tension arm - Google Patents

Abstract

PURPOSE:To attain simplification of a structure of a tension arm and a light weight of it. CONSTITUTION:A tape guide 11 is attached to a tip 17b of the arm 17 formed from a sheet metal and a bendable part 17c is formed at a base end 17c side of the arm 17, and the based end 17a of the arm is attached to an arm shaft 1 and by utilizing bending of the bendable part 17c of the arm 17 the inclination of a tip 17b side of the arm 17 is adjusted with plural adjusting screws 19, 20.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a tension arm suitable for application to, for example, a video tape recorder.
In particular, the present invention relates to a device for adjusting the perpendicularity of a tape guide.

0002

[Prior Art] Conventionally, in video tape recorders,
A tension arm as shown in FIG. 4 is used. This is used for a tension regulator, and an arm base 2 is fixed to the upper end of a vertical and freely rotatable arm shaft 1, and an approximately L-shaped arm adjustment base 3 is attached to the side of the arm base 2. A pair of Y-direction adjustment screws 4 and a pair of tightening screws 5
The arm mounting base 6 is attached to the tip of the arm adjustment base 3 using a pair of X-direction adjustment screws 7 and a pair of tightening screws 8. A guide arm 10 is horizontally and rotatably mounted on the arm mount 6 via a vertical arm rotating shaft 9, and a tape guide 11 is vertically mounted on the tip of the guide arm 10. A tension detector 12 is mounted on the lower end side of the arm rotation shaft 9.
is installed.

This tension arm is configured such that the tape guide 11 is pulled out from the unloading position to the loading position by rotationally driving the entire tension arm in the direction of arrow a by the arm shaft 1, and the magnetic tape is loaded by the tape guide 11. Tape cassette (
(both not shown) from inside to the loading position. During recording and playback, the tape guide 11 is rotated together with the guide arm 10 in the direction of arrow b around the arm rotation axis 9 in response to fluctuations in the tension of the magnetic tape, and the rotation angle is detected by the tension detector 12. This allows the tension of the magnetic tape to be controlled.

In this type of tension arm, since the tension of the magnetic tape is detected by the tape guide 11, it is necessary to adjust both the verticality of the tape guide 11 and the horizontality of the rotating surface of the guide arm 10 with high precision. be.

Conventionally, the loosening and fixing operations using a pair of tightening screws 5 and the operation of loosening and fixing using a pair of Y-direction adjustment screws 4 were performed at the sliding surface 13 between the arm base 2 and the arm adjustment table 3.
The inclination of the arm rotating shaft 9 in the Y direction is adjusted by the adjusting operation, and the loosening and fixing operations are performed using a pair of tightening screws 8 on the sliding surface 14 between the arm adjusting base 3 and the arm mounting base 6. The inclination of the arm rotation shaft 9 in the X direction is adjusted by the adjustment operation using the X direction adjustment screw 7.

[0006]

[Problems to be Solved by the Invention] However, as in the conventional case, two of the arm base 2, arm adjustment base 3, and arm mounting base 6 are
The method of adjusting the X direction using a large number of adjusting screws 4, 7 and a large number of tightening screws 5, 8 on the two sliding surfaces 13, 14 has a complicated structure and requires a large number of parts and assembly man-hours. , which results in significantly higher costs. There is a problem in that the entire tension arm becomes large and heavy, requiring a large installation space for the tension arm and requiring a large rotational driving force.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a tension arm that can be simplified in structure and reduced in weight.

[0008]

[Means for Solving the Problems] A tension arm of the present invention for achieving the above object is formed of an arm shaft, an arm base attached to the arm shaft, and a sheet metal, and the base end is formed of the arm shaft. an arm that is attached to a shaft or an arm base and has a tape guide attached to its tip, a bendable part formed on the proximal end side of the arm, and the arm base on the distal end side of the bendable part of the arm. and a plurality of adjustment screws that are attached between the arm and the arm and adjust the inclination of the distal end side of the arm using the curvature of the bendable portion.

[0009]

[Operation] The tension arm of the present invention configured as described above uses the curvature of the bendable portion of the arm formed of sheet metal to adjust the inclination of the tip side of the arm by adjusting a plurality of screws. It is something.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tension arm in which the present invention is applied to a tension regulator of a video tape recorder will be described below with reference to FIGS. 1 and 2. Note that the same reference numerals are given to the same structural parts as in FIG. 4, and redundant explanation will be omitted.

First, an arm base 16 made of sheet metal is fixed horizontally to the upper end of the arm shaft 1. Further, the arm 17 formed of sheet metal has its base end 1
Notches 18 are formed on both sides of a position biased towards the proximal end 17a between the distal end 17b and the distal end 17b.
A narrow bendable portion 17c is integrally formed therebetween.

The arm 17 is horizontally fixed to the upper end of the arm shaft 1 (or the arm base 2) by the base end 17a, and the tip 1 is
Three adjustment screws, a pair of X-direction adjustment screws 19 and one Y-direction adjustment screw 20, are vertically installed between the arm base 16 and the arm base 16 on the 7b side. Note that the pair of X-direction adjustment screws 19 are configured as lead-in screws, and the arm 17
A pair of screw insertion holes 21 formed on both sides of the center P of
It is vertically inserted into the arm base 16 from above and is screwed into a pair of female screw holes 22 formed in the arm base 16. Further, one Y-direction adjustment screw 20 is configured as a set screw, and is screwed and inserted into a female screw hole 23 formed at the center P of the arm 17, and vertically abuts on the arm base 16. ing. The guide arm 10 is horizontally and rotatably attached to the tip 17b of the arm 17 via the arm rotation axis 9 perpendicular to the tip 17b of the arm 17, and the tape guide 1 is mounted on the tip of the guide arm 10.
1 is attached vertically, and a tension detector 12 is attached to the lower end of the arm rotation shaft 9.

The magnetic tape pull-out operation and magnetic tape tension detection operation of this tension arm are similar to those of the conventional example explained with reference to FIG.

When adjusting the verticality of the tape guide 11 and the horizontality of the rotating surface of the guide arm 10, the adjustment is performed by mutually adjusting a pair of X-direction adjustment screws 19 and one Y-direction adjustment screw 20. , bendable portion 17c of arm 17
Using the curve of the arm 17, the tip 17b of the arm 17 is connected to the base 17.
With respect to a, adjust the tilt in the Y direction as shown in Figure 2,
As shown in FIG. 3, the tilt can be adjusted in the X direction.

Although one embodiment of the present invention has been described above,
The present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, the guide arm 10 is mounted on the tip 17b of the arm 17 via the arm rotation shaft 9.
Attach the tape guide 1 on the guide arm 10.
1 is attached, but the arm rotation shaft 9 and guide arm 10 are omitted, the tape guide 11 is attached directly to the tip 17b of the arm 17, and the tension detector 12 etc. are attached to the lower end of the arm shaft 1. It may be something.

[0017]

[Effects of the Invention] Since the tension arm of the present invention is constructed as described above, it has the following effects.

[0018] A bendable part is formed on the proximal end side of the arm, which is formed from sheet metal and has a tape guide attached to the tip, and the inclination of the distal end side of the arm is adjusted using the curvature of the bendable part using a plurality of adjustment screws. Since the structure is configured to adjust, the structure is simple, the number of parts and the number of assembly steps can be significantly reduced, and costs can be significantly reduced.

[0019] Since the arm formed of sheet metal is lightweight and the number of adjustment screws can be reduced, the entire tension arm can be made smaller and lighter, and the installation space for the tension arm can be reduced. In addition, it is possible to save the rotational driving force of the tension arm.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a tension arm according to an embodiment of the present invention.

FIG. 2 is a partially cutaway side view taken along the line A-A in FIG. 1;

FIG. 3 is a partially cutaway side view taken along the line B-B in FIG. 1;

FIG. 4 is a perspective view showing a conventional tension arm.

[Explanation of symbols]

1 Arm axis 11 Tape guide 16 Arm base 17 Arm 17a Base end of arm 17b Tip of arm 17c Bendable part of arm 19 X direction adjustment screw 20 Y direction adjustment screw

Claims (1)

[Claims] Claim 1: An arm formed of an arm shaft, an arm base attached to the arm shaft, and a sheet metal, the base end of which is attached to the arm shaft or the arm base, and a tape guide attached to the tip. and a bendable part formed on the proximal end side of the arm, and the arm base on the distal end side of the bendable part of the arm, and the arm is mounted by using the curve of the bendable part. Tension arm with multiple adjustment screws to adjust the tip side inclination.