JPS6128241Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a record player in which the height of the arm lifter during upward movement can be easily adjusted using an operating knob.

Generally, in a fully automatic record player, an arm lifter is used to move the record needle of the cartridge up and down relative to the surface of the record via a tone arm. In addition, a mechanism is provided to adjust the height from the top of the record surface to the tip of the cartridge stylus when the arm lifter moves upward. It is designed to accommodate changes in the height to the tip of the cartridge, and also to adjust the time it takes for the tip of the cartridge stylus to rest on the surface of the record according to the user's preference.

Next, a mechanism for adjusting the height of the arm lifter of a conventional record player during upward movement will be explained with reference to FIG. That is, cabinet 1
A cylinder 2 is fixed vertically to the upper plate part, and a piston 3 is slidably inserted into the cylinder 2 so that the piston 3 can move up and down.The lower end of the piston 3 is rotated by a support shaft 4. It is brought into contact with the upper surface of one end of the lifter lever 5 which is freely pivoted, and on the upper surface of the other end of the lifter lever 5.
The lower end of the iron core 7 of the electromagnetic coil 6 attached to the lower surface of the upper plate of the cabinet 1 is brought into contact with the lower end of the other end of the lifter lever 5, and the lifter lever 5 is rotated counterclockwise. A stopper 8 is provided to restrict the movement, and a cylindrical pipe 9 with a head is slidably inserted into the upper part of the cylinder 2.
A planar arc-shaped arm lifter 11 having a lifter rubber 10 on the upper surface is fixed to the upper part of the pipe 9, the tone arm 12 is supported by the lifter rubber 10, and an adjustment screw 13 provided on the arm lifter 11 is fixed. The coil spring 1 passes through the head of the pipe 9 and is screwed into the screw hole 3' in the upper part of the piston 3, and the coil spring 1 is inserted into the screw 13 in the pipe 9.
4 to form the pipe 9 and the arm lifter 1.
It has a structure that prevents the wobbling of 1.

Therefore, when adjusting the height from the surface of the record to the tip of the cartridge stylus, that is, the height of the arm lifter 11 during upward movement, the lifter lever 5 must be rotated counterclockwise as shown in the figure. When the arm lifter 11 is moved upward by the lifter lever 5 via the piston 3 and the pipe 9, by rotating the screw 13 to the right or left, the pipe 9 is moved to the piston 2. arm lifter 11
is moved up and down to adjust the height from the surface of the record to the tip of the cartridge stylus.

However, in the height adjustment mechanism of the arm lifter 11 described above, in order to insert the screwdriver into the groove in the head of the screw 13, the tone arm 12 must be rotated out of the way, and the adjustment operation must be performed. Moreover, if a hand or a protruding object comes into contact with the tone arm during adjustment work, the tone arm 12 will be rotated significantly, causing troubles such as the tip of the cartridge needle hitting something and being damaged.

This invention was developed with the above-mentioned drawbacks of the conventional technology in mind, and allows the height of the arm lifter during upward movement to be adjusted by the simple operation of simply rotating the operating knob. Next, this invention will be described in detail with reference to Figs. 2 and 3, which show one embodiment of the invention.

In these figures, the same symbols as those in FIG.
As shown in FIG. 3, the stopper is integrally formed on the other end of the lifter lever 5, and as shown in FIG. The bottom of the ends touch.
17 is an operating knob fixed to one end of the rotating shaft 15. Note that the pipe 9 and screw 13 shown in FIG.
The arm lifter 11 is directly fixed to the upper end of the piston 3'' by removing the coil spring 14.

Next, the operation of the above embodiment will be explained.

When the tone arm 12 is rotated while sliding against the lifter rubber 10 and then positioned above a record or the arm rest, the detection device of the fully automatic mechanism passes current through the coil 6, generating a magnetic field in the coil 6, the magnetic force of which attracts the iron core 7 upward from the state shown in FIG. 2, and when the load on the other end of the lifter lever 5 by the iron core 7 is removed, the lifter lever 5 is rotated clockwise by the load applied to one end of the lifter lever 5 by the piston 3", tone arm 12, etc. As a result, the piston 3" slides downward against the cylinder 2, and the arm lifter 11 also descends together with the piston 3", so that the record needle of the cartridge is placed on the record or the tone arm is placed on the arm rest, and then the piston 3" and arm lifter 11 descend further, and the arm lifter 11 disengages from the tone arm 12.

Furthermore, when the record playing is finished and the record needle reaches the final tone groove of the record, the fully automatic mechanism stops energizing the coil 6, and the gravity of the iron core 7 is applied to the other end of the lifter lever 5. Since the force for rotating the lifter lever 5 counterclockwise by the iron core 7 is set in advance to be greater than the force for rotating the lifter lever 5 clockwise by the piston 3'', the lifter lever 5 is rotated counterclockwise. direction, the piston 3″ is pushed up, and the lifter rubber 10 of the arm lifter 11
touches the tone arm 12 and the tone arm 12
2, the lower part of the other end of the lifter lever 5 comes into contact with the stopper 16 of the rotating shaft 15 and comes to rest.

When the operating knob 17 is rotated when the arm lifter 11 is moved upward, the rotating shaft 15
The stopper 16 rotates through the lifter lever 5, and the contact position of the stopper 16 with the lifter lever 5 changes.Since the stopper 16 has a cam shape, the piston 3'' is moved up or down through the lifter lever 5, and the arm The height of the lifter 11 can be adjusted arbitrarily.

As described above, according to the record player of this invention, the arm lifter supporting the tone arm is fixed to the upper end of the vertically movable piston, the lower end of the piston is brought into contact with the lifter lever for raising and lowering the arm lifter, and the cabinet An operating knob is fixed to one end of the rotating shaft led out to the outside, and a stopper is provided at the other end of the rotating shaft to abut the lifter lever and restrict the upward movement of the piston. With this shape, the height of the arm lifter during upward movement can be adjusted smoothly by simply rotating the operating knob.

[Brief explanation of the drawing]

Fig. 1 is a cutaway front view of a part of a conventional record player, Fig. 2 is a cutaway front view of a main part of an embodiment of the record player of this invention, and Fig. 3 is a cutaway front view taken along line A-A' in Fig. 2. FIG. 1...cabinet, 3''...piston, 5...
...Lifter lever, 11...Arm lifter, 1
2... Tone arm, 15... Rotating shaft, 16...
Stopper, 17...operation knob.

Claims (1)

[Scope of utility model registration request] An arm lifter supporting the tone arm is fixed to the upper end of a vertically movable piston, the lower end of the piston is brought into contact with a lifter lever for raising and lowering the arm lifter, and one end of a rotating shaft led out to the outside of the cabinet is mounted. At the same time as fixing the operating knob,
A record player in which a stopper is provided at the other end of the rotating shaft for abutting against the lifter lever and regulating the upward movement position of the piston, and the circumferential surface of the stopper is shaped like a cam.