JPS6211064Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tuning axis in a push-button tuner.

The push button tuner has a tuning shaft for manual operation installed in parallel with the push button for tuning, and by rotating the knob at the front end of this tuning shaft, a desired frequency can be set on the push button, or A frequency other than the one set on the push button is being arbitrarily selected.

Conventionally, such tuning shafts have mainly been made of metal, but in recent years tuning shafts mainly made of plastic have been developed and have already been proposed by the applicant of the present invention. Figure 1 shows a typical configuration example, in which the manual shaft 2, universal joint 3, and driven shaft 4 are fitted into a bearing 1 fixed to the front panel of the tuner. By constructing it from an integrally molded plastic product, it is possible to reduce the number of parts, eliminate the need for assembly work, and reduce costs. In particular, the universal joint 3 has a simple structure in which multiple notches in different directions are provided on the tuning shaft, and has the advantage that it can be bent freely in any direction, up, down, left, or right using the elasticity of plastic. has. Further, this tuning shaft is provided with a friction piece 5 made of polyurethane elastomer or the like instead of a pinion at its tip, and everything except the bearing 1 and the E-ring 11 for locking it is made of plastic.

In the synchronized shaft having such a configuration, the clutch disengaging operation is performed by pressing the operating force point A with a kick arm (not shown), and this pressing bends the universal joint 3, causing the friction piece 5 and the transmission mechanism (not shown) to bend.
This is done by unfastening the crimping.

However, since the driven shaft 4 itself is made of plastic and has flexibility, it bends at the operating force point A and absorbs the pushing force of the kick arm, so the bending at the universal joint 3 is insufficient. If this is not done, the engagement between the friction piece 5 and the transmission mechanism cannot be sufficiently released, resulting in a so-called clutch disengagement failure.

The purpose of this invention is to eliminate this problem of clutch disengagement, and its basic feature is that a reinforcing material such as a metal piece is provided at the core between the operating force point and the friction piece. .

An embodiment of the present invention will be described below with reference to FIG. FIG. 2 is a partially cutaway front view, and the same parts as in FIG. 1 are given the same numbers.

In the present invention, a metal piece 6 serving as a reinforcing material is provided at the core of the friction piece 5, which is a rotation transmission piece, from the operating force point A of the driven shaft 4.

In this embodiment, the reinforcing material 6 is a rod-shaped body with an angular cross section, but it may be of any shape, such as a pipe-like one, or it may be a highly rigid member other than metal. Furthermore, in this embodiment, as a specific arrangement means, the reinforcing material 6 is first press-fitted from the tip of the driven shaft 4, leaving only the tip, and then the friction piece 5 is fitted to the tip. However, the entire tuning shaft and the metal piece may be integrally molded by insert molding.

In the above configuration, when the kick arm presses the operating force point A, the area from the operating force point A to the friction piece 5 loses flexibility due to the reinforcing material 6, so it does not bend here and the universal joint 3 parts are enough to bend. Therefore, the friction piece 5 is largely released from pressure with the vibration transmission mechanism.

As described above, the tuning shaft according to the present invention does not bend at the operating force point and does not absorb the pushing force of the kick arm at this point, so it has the excellent effect of preventing clutch disengagement.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional tuning shaft, and FIG. 2 is a partially cutaway front view showing an embodiment of the tuning shaft according to the present invention. 1... Bearing, 2... Manual shaft, 3... Universal joint, 4... Driven shaft, 5... Friction piece,
6... Reinforcement material, 11... E-ring.

Claims (1)

[Scope of utility model registration request] A tuning shaft for a push button tuner, which is made of plastic and is characterized in that a reinforcing material is provided in the core between the clutch operating force point and the rotation transmission piece.