JPS5814423Y2 - Head height adjustment device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a head height adjustment device.

A head height adjustment device as shown in FIG. 1 has been proposed in the past, in which the head 1 is loosely fitted into through holes 3°3 formed on both sides of a head mounting plate 2 on which the head 1 is mounted in the center. Screw the tips of the screws 4.4 into the board 5, and connect the springs 6.6 to the head mounting plate 2 and each screw 4, 40.
Insert it into the body of screw 4.4 while elastically contracting between the heads,
Further, a height adjustment screw 7 is provided which is screwed into the substrate 5 and whose tip abuts against the head mounting plate 2 approximately within the gap forming surface of the head 1.The height adjustment screw 7 is used to adjust the height of the head. This is done by turning the spring 6.60 to change the elastic state.

However, in the configuration of such a conventional device, it is difficult to balance the head mounting plate 2 in the depth direction (perpendicular to the paper surface), and the head mounting plate 2 is difficult to balance in the depth direction (perpendicular to the plane of the paper). 1 causes the so-called tilting, and the head 1 and the magnetic tape do not come into uniform contact, resulting in a large spacing loss (this has the disadvantage that good recording and playback cannot be performed), and adjustment is done by directly touching the head of the adjustment screw 70 with a screwdriver. It was difficult to make fine adjustments because it was turned using tools such as .

The present invention solves these conventional drawbacks and will be described in detail below with reference to the drawings.

FIG. 2 shows an embodiment of the device according to the present invention, in which a head mounting plate 22 is arranged on the lower surface side of a substrate 20 and on which a head 21 is placed. The head 25 of the screw 24 is loosely fitted and the tip is screwed into the board 20.
The spring 27 is elastically compressed between the screw 24 and the lower surface of the head mounting plate 22, and is urged toward the substrate 20 by the elasticity of a spring 27 fitted into the body 26 of the screw 24.

A substrate 20 is disposed on the upper surface near one end of the head mounting plate 22.
The tips of the first and second screws 29 and 30 having the same pitch are screwed into the head 2 to form a height adjustment screw.
It abuts against the upper surface of the mounting plate 22 at a required interval in the depth direction within the approximate gap forming surface A-A of No. 1.

The surfaces of the heads 31.32 of the first and second screws 29.30 are provided with engaging portions in which gears 33.34 having the same number of teeth are formed, respectively.

Both gears 33 and 34 are rotatably supported 35 on the base plate 20, have a required number of teeth smaller than the number of teeth of both gears 33 and 34, and have engaging portions formed of wide gears. The drive members 36 each have a meshing connection with the drive member 36.

The driving member 36, which has a groove 37 formed on its upper surface to be rotated using a tool such as a screwdriver, is provided with a locking means 38 that prohibits free rotation thereof.

The locking means 38 includes a wedge-shaped locking piece 39 made of elastic synthetic resin or the like whose tip engages between the teeth of the driving member 36 .
It is supported by a fixed part 41 fixed at 0.

In the device of the present invention having the above configuration, the head adjustment is performed by first bending the locking piece 39 of the locking means 38 in a desired direction using its elasticity to release the locked state of the driving member 36, and inserting a tool such as a screwdriver into the groove 37. When the driving member 36 is rotated in the required direction, the first and second screws 29, 30
are rotated in the same direction at the same pitch and are equally displaced. Therefore, the head mounting plate 22 rotates in the desired direction using the abutting portion with the vertical adjustment screw 28 as a fulcrum due to the elastic change of the spring 270. Since the parallel state in the depth direction does not change, the height of the head 21 relative to the magnetic tape can be changed without causing tilting.

After adjusting the height, the driving member 36 is locked by the locking means 38, and then the vertical adjustment is performed by turning the vertical adjustment screw 28.

During vertical adjustment, the head mounting plate 22 rotates about the abutting portion of the height adjustment screw located within the gap forming surface as a fulcrum, so that the influence on the height of the head 21 is extremely small.

Also, in height adjustment, the number of teeth of the drive member 36 is set to be smaller than the number of teeth of the gears 33, 34 of the first and second screws 29, 30, so that extremely fine adjustment can be made according to the rotation ratio. .

In the above-described embodiment, the engaging portions formed on the heads of the first and second screws constituting the height adjusting screw and the engaging portion formed on the drive member were both formed of meshing gears. The invention is not limited to this, and a friction member such as rubber that performs frictional engagement may be used in place of the gear, and the height adjustment screw and the driving member may be connected via a belt instead of being directly engaged by the gear. Of course, it may be formed in this manner.

As mentioned above, the device of the present invention prevents the unbalance of the height change in the depth direction of the head mounting plate that occurs with conventional head adjustment, suppresses the occurrence of head tilting, and makes it possible to extremely accurately adjust the head height. An adjustable height adjustment device can be provided.

[Brief explanation of drawings]

FIG. 1 is a sectional front view of a main part of a conventional device, and FIG. 2 is an embodiment of the device of the present invention, in which a shows a sectional front view of the main part and b shows a plan view of the main part. 20... Board, 21... Head, 22
...Head mounting plate, 29.30 ...Height adjustment screw, 31°32 ...Head, 33.34
...Gear, 36...Driving member, A-A
...Gap forming surface.

Claims (5)

[Scope of utility model registration request] (1) A height adjustment device for a head mounted on a head mounting plate that is elastically supported with respect to a substrate, and the tip of the head abuts against the head mounting plate at a required interval on a gap forming surface of the head. two height adjustment screws that are screwed onto the substrate and have a body portion formed with thread grooves having the same pitch and a head portion formed with a required engagement portion on a circumferential surface; a driving member provided on the substrate and provided with required engaging parts formed so as to be connected to each of the engaging parts of the height adjusting screw, and the height adjusting screw is rotated by rotation of the driving member. A head height adjusting device, characterized in that the head height adjusting device is formed so that the height of the head can be changed by rotating in the same direction and at the same angle through the connection of the respective engaging portions. (2) The head according to claim 1, wherein the engaging portion of the height adjusting screw and the engaging portion of the driving member are gears having teeth formed at the same pitch. height adjustment device. (3) A request for registration of a utility model characterized in that the gears forming the respective engaging portions of the height adjustment screw are gears that are equal to each other and have a greater number of teeth than the gears forming the engaging portion of the drive member. The head height adjustment device according to the range 1 or 2. (4) The head height adjusting device according to claim 1, wherein the engaging portion of the height adjusting screw and the engaging portion of the driving member are each formed of a required friction member. . (5) The head height adjustment device according to claim 1, wherein the engagement portion of the height adjustment screw and the engagement portion of the drive member are each connected by a belt.