JPH0677011U - Head adjustment mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to perform tilt adjustment without disturbing the height, and a height adjusting unit and a tilt adjusting unit can be provided in one device, and further, an adjustment error occurs due to backlash or the like. A head adjusting mechanism that does not exist is provided. [Configuration] Head block 2 with respect to head base 15
Leaf spring 33 for biasing 6 in the direction of head base 15
To provide. Further, coaxially with the pressing portion 33B of the leaf spring 33,
An azimuth adjusting screw 28C for urging the head block 26 against the head base 15 in the direction opposite to the pressing direction of the coil spring 37 for pressing the head block 26 in the direction opposite to the head base 15 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a head adjusting mechanism in a tape recorder.

[0002]

[Prior art]

 As an example of a head adjusting mechanism in a conventional tape recorder, a structure as shown in FIG. 7 is known. A head base 15 is movably provided on the chassis 11, and the head base 15 has a head support portion 17 in which a part is bent and a bent portion 18 in which the tip end portion is further bent. . A rotary shaft 21 is rotatably supported by the head support 17 via a bearing metal 43, and a magnetic head 19 is attached to the rotary shaft 21 via a head mounting member 20.

A ball 46 rotatably supported by a ball receiver 47 on the chassis 11 is in contact with the lower surface of the head base 15. An adjusting screw portion 23 is screwed onto the tip end side of the head base 15 from the lower surface side, and the adjusting screw portion 23 is provided on a pin 31 together with a flange 24, and the pin 31 is provided on the head base 15 and the chassis 1. It is attached between 1 and.

In such a structure, when the adjusting screw portion 23 is rotated, the height of the head base 15 with respect to the chassis 11 on the tip side changes, so that the height of the magnetic head 19 attached to the head base 15 changes. The height of the head can be adjusted as the height changes. Further, the rotation of the adjusting screw portion 23 causes the head base 15 to rotate about the ball 46 as a fulcrum to change the inclination in the front-rear direction, so that the inclination of the magnetic head 19 can be adjusted. That is, according to such a head adjusting mechanism, it becomes possible to adjust the height and the tilt of the magnetic head 19 by using the adjusting screw portion 23.

[0005]

By the way, in the conventional head adjusting mechanism, the adjusting screw portion 23 as the height adjusting screw is not provided at the position directly below the head guide. There is the problem of going crazy. Further, it is difficult to provide the height adjusting unit and the tilt adjusting unit in one device due to the structure.

The present invention has been made in consideration of the above problems, and tilt adjustment can be performed without disturbing the height, and a height adjusting unit and a tilt adjusting unit can be provided in one device. It is possible to apply the biasing load of the pressure spring directly above the support point of the head block so that bending stress does not occur in the head block and eliminate the risk of head adjustment error due to creep deformation of the head block. Another object of the present invention is to provide a head adjusting mechanism that prevents adjustment errors due to backlash.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention includes a head base that moves on a chassis, a head block provided on the head base, a magnetic head provided on the head block, and a magnetic head provided on the magnetic head. In a head adjusting mechanism of a tape recorder, which is equipped with a tape guide and which records or reproduces a signal by bringing the magnetic head into contact with a tape, the head block is moved in the direction of the head base with respect to the head base. A leaf spring for biasing the leaf spring and an adjusting screw provided coaxially with the pushing portion of the leaf spring for biasing the head block against the head base in a direction opposite to the pushing direction of the leaf spring are provided. The pressing portion of the leaf spring and the adjusting screw should be provided on the extension line of the magnetic head in the height direction from the tape guide. It is characterized in.

[0008]

[Action]

 Since the adjustment screw is provided directly below the head guide, the height will not be disturbed when performing tilt adjustment. Further, the height adjusting unit and the tilt adjusting unit can be provided in one device. Furthermore, since the head block is pressed toward the chassis, there is no backlash in the adjustment screw, so adjustment does not go wrong.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 are a plan view, a front view and a side view showing an embodiment of a head adjusting mechanism of the present invention. A head base 15 is movably provided on the chassis 11, and a head block 26 as shown in FIG. 6 is provided on the head base 15, and a magnetic head 19 is provided on the head block 26. A tape guide 25 is provided on the magnetic head 19.

Each of the head blocks 26 is provided with a positioning hole 27A, a pair of head mounting screw holes 27B and 27B, an azimuth adjusting hole 27C, a height adjusting screw hole 27D, and a tilt adjusting screw hole 27E. The head block 26 is fixed to the head base 15 by inserting a positioning pin 28A, a pair of head mounting screws 28B and 28B, an azimuth adjusting screw 28C, a height adjusting screw 28D, and a tilt adjusting screw 28E, respectively. Here, the pair of head mounting screws 28B and 28B are inserted through the head mounting plate 29, and the height adjusting screw 28D and the tilt adjusting screw 28E are push screws. Further, the height adjusting screw 28D is provided immediately below the tape guide 25.

FIG. 5 is a perspective view showing the magnetic head 19 having the head mounting plate 29 fixed to the lower surface. Here, the XX ′ axis indicates a rotation axis for azimuth adjustment, the YY ′ axis indicates a rotation axis for tilt adjustment, and the ZZ ′ axis indicates height adjustment. The rotation axis of is shown.

Reference numeral 33 denotes a leaf spring having a shape as shown in FIG. 4. A pair of pressing portions 33B and 33B are provided in a direction orthogonal to each other from the long portion 33A through the step portion, and each of them has a pressing portion 33B. A height adjusting screw hole 34A and a tilt adjusting screw hole 34B are provided. A protruding piece 33C is provided between the pair of pressing portions 33B and 33B, and a leaf spring fixing screw hole 34C is provided therein. 34D is a dowel hole.

The leaf spring 33 is provided in the height adjusting screw hole 34 A and the tilt adjusting screw hole 34 B, respectively, so as to press the head block 26 against the head base 15 toward the head base 15. The height adjusting screw 28D and the tilt adjusting screw 28E, which are push screws, are inserted, the plate spring fixing screw 35 is inserted into the plate spring fixing screw hole 34C, and the dowel 36 is inserted into the dowel hole 34D. As a result, the weight adjusting screw 28D and the tilt adjusting screw 28E are provided coaxially with the pressing portion 33B by one plate spring 33, and the head block 26 is moved in the direction opposite to the pressing direction of the plate spring 33 with respect to the head base 15. Acts to urge.

Below the azimuth adjustment 28C, as shown in FIG. 2, an azimuth spring 37 composed of a compression coil is wound. Further, as shown in FIGS. 1 and 3, a cassette 38 and a decorative plate 39 are arranged near the magnetic head 19.

Next, the operation of this embodiment will be described. When the height of the magnetic head 19 is adjusted, the height position of the head block 26 is changed by rotating the height adjusting screw 28D that is pressed by one pressing portion 33B of the leaf spring 33. You can adjust the height. At this time, the tilt adjustment screw can be turned in the same direction by the same amount to prevent tilt tilt.

Next, when the tilt of the magnetic head 19 is adjusted, the tilt adjusting screw 28E pressed by the other pressing portion 33B of the leaf spring 33 is rotated, whereby the head block 26 is moved to the height adjusting screw and the azimuth adjusting screw. Rotate around the line connecting the adjustment screws. Since this shaft is located directly below the head guide, the tilt of the magnetic head 19 can be adjusted without the height changing. Subsequently, when the azimuth adjustment of the magnetic head 19 is performed, the azimuth adjustment of the magnetic head 19 can be performed by rotating the azimuth adjusting screw 28C and adjusting the head lock angle by the urging force of the azimuth spring 37. it can.

When such height adjustment, tilt adjustment, and azimuth adjustment are performed, since the head base 15 is pressed toward the chassis 11 by the leaf spring 33, each adjustment screw does not rattle, and each adjustment is accurately performed. It can be carried out. Further, by using the leaf spring 33, it becomes possible to provide the height adjusting section and the tilt adjusting section with one member (device). Further, by providing the height adjusting screw 28D at a position directly below the tape guide 25, the height of the tape guide can be kept unchanged during tilt adjustment and azimuth adjustment.

Further, even though the height adjusting screw 28D is provided directly below the tape guide 25, the height of the height adjusting screw 28D is kept low by the structure of the leaf spring, so that when the height adjusting screw 28D is adjusted, The space for inserting the tool can be secured, and the adjustment work can be performed easily. As shown in FIG. 3, when the coil spring 40 is used, the height becomes large, and the tip of the spring guide rod 41 that holds the coil spring 40 hits the cassette 38, which makes it impossible to realize. Become . Therefore, the spring and the adjusting screw cannot be provided coaxially.

Since the height dimension of the leaf spring 33 that simultaneously presses the head base 15 is small as in the present embodiment, the push screws used as the height adjusting screw 28D and the tilt adjusting screw 28E do not protrude below the head base 15. So, don't take extra space. The present embodiment is not limited to a normal tape recorder, but can be applied to an auto-reverse type tape recorder.

[0020]

[Effect of device]

 As described above, according to the present invention, the plate spring for pressing the head block toward the head base and the adjusting screw for urging the head block in the direction opposite to the pressing direction of the plate spring are provided coaxially with the pressing portion. The tilt adjustment can be performed without disturbing the height, and the height adjustment unit and the tilt adjustment unit can be provided in one device, and a head adjustment mechanism that prevents the adjustment error from being caused by rattling, etc. Can be provided.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a head adjusting mechanism of the present invention.

FIG. 2 is a front view showing the present embodiment.

FIG. 3 is a side view showing the present embodiment.

FIG. 4 is a perspective view showing a leaf spring used in this embodiment.

FIG. 5 is a perspective view showing a magnetic head used in this embodiment.

FIG. 6 is a perspective view showing a head block used in this embodiment.

[Explanation of symbols]

 11 chassis 15 head base 19 magnetic head 25 tape guide 26 head block 28C azimuth 28D height adjusting screw (pushing screw) 28E tilt adjusting screw (pushing screw) 33 leaf spring 33B leaf spring pressing portion

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[Procedure amendment]

[Submission date] March 16, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a head adjusting mechanism of the present invention.

FIG. 2 is a front view showing the present embodiment.

FIG. 3 is a side view showing the present embodiment.

FIG. 4 is a perspective view showing a leaf spring used in this embodiment.

FIG. 5 is a perspective view showing a magnetic head used in this embodiment.

FIG. 6 is a perspective view showing a head block used in this embodiment.

FIG. 7 is a side view showing a conventional head adjusting mechanism.

[Explanation of reference numerals] 11 chassis 15 head base 19 magnetic head 25 tape guide 26 head block 28C azimuth 28D height adjusting screw (pushing screw) 28E tilt adjusting screw (pushing screw) 33 leaf spring 33B leaf spring pushing portion

Claims (1)

[Scope of utility model registration request] 1. A head base that moves on a chassis,
A head block provided on the head base, a magnetic head provided on the head block, and a tape guide provided on the magnetic head are provided, and the magnetic head is brought into contact with the tape to record or reproduce a signal. In the head adjusting mechanism of the tape recorder, the plate spring for pressing the head block against the head base in the direction of the head base, and the head provided coaxially with the pressing portion of the plate spring are used. An adjusting screw for urging the head block in a direction opposite to the pressing direction of the leaf spring with respect to the base is provided, and the pressing portion of the leaf spring and the adjusting screw are moved from the tape guide in the height direction of the magnetic head. Head adjustment mechanism provided on the extension line to.