JPH0441471Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tape guide height adjustment mechanism for guiding tape running in a tape recorder or the like.

[Conventional technology]

A conventional tape recorder will be explained with reference to FIGS. 4 to 6.

A recording/reproducing head 1 and an erasing head 2 are arranged in the tape running direction, and both are fixed to a head mount 4 having a rotating shaft 3 projecting rearward. The rotating shaft 3 is a head fixed by screws 6 to a head base 5 which can be moved on the board using a long notched hole 5a as a guide so that the heads 1 and 2 come into contact with the tape surface in the cassette during operation of the tape recorder. It is rotatably inserted into a bearing 8 provided at the center of the plane of the positioning member 7, and a gear 9 is fixed by press-fitting or the like on the opposite side of the head mount 4, and is connected to the head mount 4 and the rotating shaft 3. It is designed to rotate as one. Further, the gear 9 has a pin 10 whose center portion is established at the lower end of the head positioning member 7.
A sector-shaped gear 11 that is pivotably supported and rotatable is engaged with it. Further, the sector gear 11 is provided with a protrusion 11a that rotates in response to the operation of an operating member of a tape recorder (not shown). Reference numeral 12 designates a torsion spring having one end engaged with an eccentric pin 9a provided at the end of the gear 9 and the other end engaged with the pin 10 to ensure rotation of the head mounting body 4. I am doing it so that I can get it.

The adjustment screws 13a, 13b are engaged with screw holes 7a, 7b provided at both ends of the upper side of the head positioning member 7a via the plate spring 14, and are slightly protruded to the opposite side. are brought into contact alternately. Therefore, by turning the adjustment screws 13a and 13b, the rotation angle of the head mounting body 4 is changed, so that the contact angle (azimuth angle) between the heads 1 and 2 and the tape (not shown) can be adjusted.

On both sides of the head positioning member 7, a shaft 15 that is established on the head base 5 and has a male threaded portion 15a at its tip is provided with a guide portion 16a that guides the tape width direction at one end, and a guide portion 16a that guides the tape width direction is provided on the lower side of the shaft 15. The tape guide is provided with protruding pins 16a and 16b that are inserted into cutout holes 5b and 5c, respectively, and fitted with a through hole 16d provided at an end opposite to the position where the guide portion 16a is disposed. A pair of members 16 are provided. Further, a coil spring 17 is engaged with one pin 16b of each of the tape guide members 16 so as to press the tape guide member 16 upward at all times, and the male threaded portion 13a of the shaft 15 is connected to the fifth pin 16b. As shown in the partial sectional view of FIG. 6, it is screwed by a nut 18 shown in the figure, and by turning the nut 18, it cooperates with the coil spring 17 to adjust the height direction of the tape guide member 16. is possible.

The conventional tape guide height adjustment mechanism is configured as described above. When adjusting the height, first, a jig is used to adjust the guide portion 16a of the tape guide member 16.
After that, in order to make the contact angle between the head and the tape appropriate, adjust the tape guide member 16 by moving it up and down while watching the tape run.

[Problem that the invention attempts to solve]

However, with such a conventional tape guide height adjustment mechanism, even if the head is installed at an inappropriate angle, the contact angle between the head and the tape can be adjusted by adjusting the height of the tape guide member 16. You will be able to set it at an appropriate angle. That is, even if the contact angle between the head and the tape is appropriate, the tape may end up in a so-called curled state in which it strongly slides against one side of the tape guide portion 16a. In such a case, the head must be replaced or reattached, and the same height adjustment of the tape guide must be performed again, making the process complicated and time-consuming. An object of the present invention is to solve the above-mentioned problems and provide a tape guide member height adjustment mechanism with a simple adjustment process.

[Means for solving problems]

In the present invention, a recess is formed in the shaft into which the through hole of the tape guide member is fitted, and the tape guide member is provided with an engaging part that engages with the recess.
The height adjustment range of the tape guide member can be regulated.

[Effect]

Since the recess is formed in the shaft and the tape guide member is provided with an engaging portion that engages with the recess, the height of the tape guide member can be adjusted within a predetermined range.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 3.

Reference numeral 21 denotes a shaft which is inserted into a hole 5d drilled in the head base 5 and fixed with a screw or the like, and has a male threaded portion 21b at its tip, and a shaft having a predetermined width extending around the entire circumference below. A recess 21a is provided. Further, 20 is made of synthetic resin, and has a guide portion 20a on one side that guides the width direction of the tape,
The other side is provided with a through hole 20b that engages with the shaft 21, and a notch hole 5 bored in the head base 5 is provided between the guide portion 20a and the through hole 20b.
The tape guide member is provided with protruding pins 20c and 20d that are inserted into one of the pins 20c and 5b, respectively. In addition, the through hole 20b of the tape guide member 20
Two arm parts 20e and 20f are formed at the upper part of the shaft 21 so as to surround the through hole 20b, and a protrusion 20g that fits into the recess 21a of the shaft 21 is formed inside the tips of the arm parts 20e and 20f. , 20h are each provided integrally. A coil spring 17 is fitted into one of the protruding pins 20d to constantly bias the tape guide member upward. 18 is an adjustment member.

Next, the case of assembling the tape guide height adjustment mechanism will be explained.

As shown in FIG. 1, the tape guide member 20 is inserted into the shaft 21, and the protrusions 20g and 20h provided on the arms 20e and 20f are inserted into the recess 2 of the shaft 21.
1a. Next, adjust the adjustment member 18 to the shaft 21.
of the male thread part 2 while pressing slightly.
Rotate along the threads of 1b and tighten the screws.

[Effect]

In the tape guide height adjustment mechanism configured in this way, the tape guide member 20 is
By engaging with the recess 21a of the tape guide member 20, the adjustment range of the tape guide member 20 can be restricted. That is, when the adjustment member 18 is loosened, the tape guide member 20
is pushed upward by the spring 17, but the protrusions 20g and 20h of the arms 20e and 20f are pushed upward by the shaft 21.
Once it comes into contact with the upper edge of the recess 21a, it will no longer rise. Also, when the adjustment member 18 is screwed in,
Although the tape guide member is pressed down, the protrusion 20
When g and 20h come into contact with the lower edge of the recess 21a, they will no longer go down. Note that the recess 2 of the shaft 21
1a, for the head placed in the proper position,
The position is set so that the tape running position can be adjusted.

[Effect of idea]

As explained above, according to the present invention, the tape guide member is provided with an arm portion having a protrusion, and the protrusion and the recess are engaged by inserting the tape guide member into the shaft provided with the recess. Since the adjustment range of the tape guide member can be restricted to the required adjustment range, there is no need to turn the adjustment member more than necessary when adjusting the height of the tape guide member.
The adjustment process is simplified, and if the tape guide member has to be moved beyond the adjustment range, it can be determined to be defective, making it easier to discover maladjustment of the tape guide.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention,
FIG. 1 is a sectional view of the main part, FIG. 2a is a plan view of the tape guide member, FIG. 2b is a side view of the tape guide member, and FIG. 3 is an exploded perspective view of the main part. 4 to 6 show a conventional example, and FIG. 4 is an exploded perspective view of the tape recorder head and its surroundings. FIG. 5 is a sectional view of the adjustment member. FIG. 6 is a sectional view of the main parts. 20... Tape guide member, 20e, 20f...
...Arm part, 20g, 20h...protrusion, 21...shaft,
21a... recess.

Claims (1)

[Scope of utility model registration request] Equipped with a head that has functions such as recording and playback,
a shaft having one end fixed to a movable head base and a male screw portion at the other end; a tape guide member having a guide portion for regulating movement in the width direction of the tape and having a through hole; , a height adjustment mechanism for a tape guide having an adjustment member that is screwed into a male threaded portion of the shaft to enable height adjustment of the tape guide member in a state where the through hole of the tape guide member is fitted, A tape guide height adjustment mechanism, characterized in that a recess is formed on the outer periphery of the shaft, and the tape guide member is provided with an engaging part that engages with the recess and regulates a height adjustable range. .