JPS6211071Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a core stroke adjustment mechanism for a push button tuner.

A push button tuner performs tuning by moving a core that is linked to a push button back and forth inside a coil. An example of this will be explained with reference to FIG. 1. First, an upper plate 1 is provided on the back side of the tuner, and a coil mounting plate 2 is vertically connected to the front edge of the upper plate 1. There is. The coil is fixed horizontally to the back surface of the coil mounting plate 2, and the coil mounting plate 2 is provided with a core insertion hole 3 facing the central opening of the coil. On the other hand, on the front of the tuner, a front panel 4 is placed parallel to the coil mounting plate 2.
A guide shaft 5 is provided so as to span the coil mounting plate 2 and the front panel 4. A core slide plate 6 is slidably mounted on the guide shaft 5, and a core 7 is horizontally attached to the upper plate 1 side of the core slide plate 6. The core 7 is inserted through the insertion hole 3 provided in the coil mounting plate 2 into the coil on the back surface of the mounting plate. Further, a protrusion 13 provided at the upper end of the side plate 8 of the rotating crank is engaged with the end of the core slide plate 6.

In the push-button tuner having such a configuration, when the channel selection push button is pressed, the rotating crank in contact with the push button rotates, and the side plate 8 thereof also rotates. Then, the core slide plate 6 engaged with the side plate 8 is guided by the guide shaft 5 and moves back and forth, and the core 7 attached to the core slide plate 6 moves back and forth inside the coil to perform synchronization. It is possible.

By the way, in this type of push-button tuner, the movement width of the core, that is, the core stroke, must be adjusted to prevent the core moving back and forth inside the coil from entering the coil too much or being pulled out too much from the coil. There is a need to do. Among these, the stroke in the direction of pulling out the core is performed by bringing a projecting piece 9 that is integrally raised up on the core slide plate 6 into contact with a locking piece 10 provided on the front panel 4.

On the other hand, in order to make the stroke adjustable in the direction in which the core enters, the upper plate 1
Conventionally, an adjustment mechanism has been employed in which a stopper 12 is fixed using a screw 11 and the tip of the stopper 12 is brought into contact with a protrusion 13 provided on a side plate 8 of the crank. In this conventional type, when adjusting the core stroke, the screw 1
1, moved the stopper 12, and then tightened the screw 11 again. However, such conventional types require screws and stoppers separately from the upper plate, so there are many parts.
Its manufacture was troublesome. Further, when making adjustments, it was necessary to loosen the screws one by one, move the stopper, and then tighten the screws again, which was a time-consuming process. Furthermore, with this method of adjustment, the stopper tends to shift when the screw is tightened again after positioning the stopper, making it extremely difficult to make accurate and minute dimensional adjustments.

Moreover, in recent years, with the miniaturization of push-button tuners, attempts have been made to omit the upper plate provided on the back of the tuner. That is, the back plate of the frame is used as the coil mounting plate 2, the upper part of the coil fixed to the back side of this coil mounting plate is exposed as it is, and the upper plate 1 is omitted. In this way, when the upper plate is not provided on the rear side of the tuner, the upper plate 1
It was impossible to adopt a core stroke adjustment mechanism with a fixed stopper.

The core stroke adjustment mechanism of the present invention was proposed in view of the above points, and includes a screw hole formed in the core mounting plate provided on the back of the frame.
By bringing the tip of the screw screwed into this into contact with the crank rod or side plate of the rotating crank, this screw can be used as a stopper for adjusting the core stroke in a push button tuner without a top plate. Moreover, it is an object of the present invention to provide a "core stroke adjustment mechanism" which allows fine adjustment of the core stroke to be easily performed.

The present invention will be explained in detail below based on the embodiments shown in FIGS. Note that the same reference numerals are given to the same members as those of the conventional type, and the description thereof will be omitted.

2 in the figure is the back plate of the frame of the tuner,
This is the coil mounting plate. This coil mounting plate 2 has a screw hole 20 with a female thread formed on the inner surface.
is perforated. A screw 21 serving as a stopper is screwed into the screw hole 20 with its tip facing toward the front of the coil mounting plate 2. Further, a coil spring 22 for preventing the screw 21 from loosening is compressed between the head of the screw 21 protruding from the rear side of the coil mounting plate 2 and the coil mounting plate.

Incidentally, the screw holes 20 formed in the coil mounting plate 2 are formed at positions such that the tips of the screws 21 come into contact with the crank rod 23 of the rotating crank or the side plate 8 of the rotating crank. That is, as explained in the conventional type, since the side plate 8 of the rotary crank engages with the core slide plate 6, the rotation angle of the rotary crank can be regulated in order to adjust the core stroke. Therefore, in the present invention, the tip of the screw 21 is brought into contact with the crank rod 23 of the rotary crank or the side plate 8, thereby regulating the rotation range of the rotary crank and thereby adjusting the core stroke. Therefore, in order to adjust the core stroke using the device of the present invention, the amount of protrusion of the tip of the screw 21 is changed by rotating the screw 21, which serves as a stopper.
The rotation angle of the rotation crank that contacts this screw 21 is regulated.

As shown in the above embodiments, the core stroke adjustment mechanism of the present invention uses a screw as a stopper, so by changing the amount of rotation of the screw, the amount of protrusion of the screw from the surface of the coil mounting plate can be reduced to an extremely small amount. It is possible to adjust with. Therefore, it is possible to finely adjust the rotation angle of the corresponding rotating crank, that is, the stroke of the core that is moved back and forth by the rotating crank. Moreover, the screw serving as the stopper may be brought into contact with any part of the rotating crank, either the side plate or the crank rod, so it may be provided at any position on the coil mounting plate within the range of the rotating crank. Therefore, it is possible to provide a screw for adjusting the stroke in the margin of the coil mounting space without providing a dedicated space for the stroke adjustment stopper on the coil mounting plate, so the coil mounting plate itself can be made smaller. It's also effective. Further, the adjustment mechanism of the present invention is applicable to a push button tuner without an upper plate, since the screw serving as an adjustment stopper is provided on the coil mounting plate.

In addition, when the spring 22 is compressed between the head of the screw and the coil mounting plate as in the illustrated embodiment, the screw is completely prevented from loosening, so that once the core stroke is set, it will not be accidentally changed. There is no deviation in frequency, and no inconveniences such as frequency deviation occur.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional core stroke adjustment mechanism, FIG. 2 is a plan view showing the core stroke adjustment mechanism of the present invention, and FIG. 3 is a side view of the same. 1... Upper plate, 2... Coil mounting plate, 3... Core insertion slot, 4... Front panel,
5... Guide shaft, 6... Core slide plate,
7...Core, 8...Side plate of rotating crank, 9...
Projecting piece, 10... Locking piece, 20... Screw hole, 21...
...Stopper screw, 22...Coil spring, 23...Crank rod.

Claims (1)

[Scope of utility model registration request] A screw hole is formed in the coil mounting plate provided vertically on the back of the push-button tuner, and a screw with the tip facing the rotating crank is screwed into this screw hole so that it can rotate freely.
A core stroke adjustment mechanism for a push button tuner, characterized in that the tip of this screw serves as a stopper for regulating the rotation angle of a rotating crank.