JPS6367242B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a record player that uses a linear tracking system and has a record track interval detection function, in which the position of the arm and the positional relationship of the record groove detection sensor can be easily adjusted. This is what I did.

Structure of a conventional example and its problems FIGS. 1 to 3 show the structure of a conventional record player.

FIG. 1 is a schematic diagram showing the overall configuration of a record player. 1 is a turntable on which a record is placed, 2 is various operation knobs for operating the record player, 3 is a player case containing turntable 1 and circuits for driving turntable 1, etc., and 4 is a record. a shaft 5 for holding the center of the record, a pick-up arm 6 configured to follow the record groove, a cartridge 7 for picking up the signal of the record groove, and a needle attached to the tip of the cartridge 7. This is a dust cover that incorporates the tips 8 and a device for operating them.

FIG. 2 schematically shows a mechanism for operating the pick-up arm 6 incorporated into the dust cover 5. As shown in FIG. In FIG. 2, 9 is a motor for driving the pick-up arm 6;
10 is a belt that transmits the driving force of the motor 9;
1 and 12 are a worm and a worm wheel for reducing the rotation speed and changing the rotation direction of the motor 9; 13 is a wire that can be moved left and right by the rotation of the worm wheel that is closely attached to the worm wheel 12; 14 is a roller for changing the direction of wire 13, 15 is wire 1
A record groove detection sensor 17 is fixed to the wire 13 and is fixed to a cover 18 that moves integrally with the pick-up arm 6. Hooked, 19 is cover 18
This is a shaft for moving the pick-up arm 6 in parallel by guiding a bearing 20 provided therein.

Figure 3 shows hook 17 and cover 1 in Figure 2.
8 is an enlarged perspective view of a portion.

In a record player having such a configuration, there are a record groove detection sensor 15 that detects the position of the record groove 16, a pick-up arm 6 attached to the cover 18, a cartridge 6 fixed to it, and a needle 8 attached to the tip of the pick-up arm 6. Since they are connected by a wire 13, they always move at a constant interval, and the stylus tip 8 moves at a distance from the center of the record detected by the record groove detection sensor 15.
Descend to the same distance r ₂ as r ₁ .

However, in reality, due to differences in the length of the wire 13 and the position of the hook 17 fixed to the wire 13, the distance between the record groove detection sensor 15 and the stylus tip 8 attached to the tip of the cartridge 7 is not constant. , there is a problem in that the stylus tip 8 cannot be lowered to a position r ₂ equal to the distance r ₁ at which the record groove was detected.

OBJECTS OF THE INVENTION The present invention provides a record player in which the positional relationship between the record groove detection sensor and the stylus tip of the cartridge can be easily adjusted.

Structure of the Invention The present invention connects the drive means of a record groove detection sensor made of wire or the like and the pedestal with an adjustable connection means made of a worm, a worm wheel, etc., and adjusts this connection means. In particular, the relative relationship between the position of the stylus tip and the position of the record groove detection sensor can be easily changed.

DESCRIPTION OF THE EMBODIMENTS FIG. 4 shows a main part of an embodiment of the present invention. Fourth
In the figures, parts having the same functions as those in FIGS. 1 to 3 are designated by the same reference numerals, and their explanations will be omitted. 18
18b is a wall surface provided on the substrate 18a, 18c, 18c
21 is a guide pin protruding from the wall surface 18b, 21 is arranged near the wall surface 18b, and a hook 17 is fixed to a part thereof. A pedestal that moves in the AB direction, 21b is pedestal 2
1, a spur gear 21c is a shaft protruding from one end of the pedestal 21, and 22 is fitted onto the shaft 21c between the wall surface 18b and the pedestal 21. 23 is a rotating shaft, 23a is a gear formed on the outer periphery of the rotating shaft 23 and meshed with the spur gear 21b of the pedestal 21, and 23b is a worm provided concentrically with the gear 23a. The wheel 24 is rotatably attached to the base plate 18a, and has a worm 24a at its tip that meshes with the worm wheel 23b,
This is an adjustment screw provided with a head 24c having a groove 24b at the rear end. Note that 25 is a tool such as a flathead screwdriver.

In the above configuration, when the tool 25 is inserted into the groove 24b of the adjusting screw 24 and the adjusting screw 24 is rotated, the rotating shaft 23 is rotated by the engagement of the worm 24a and the worm wheel 23b. When the rotating shaft 23 rotates, the gear 23a and the spur gear 2
1b, the pedestal 21 moves in the direction of the arrow AB, and thereby the cover 18 and the hook 17
The relative position of changes. As a result, wire 13
and the positional relationship between the arm 6 connected via the cover 18 and the record groove detection sensor 15 changes,
The distances r ₁ and r ₂ from the record center axis 4 can be equal. At this time, the spring 22 acts between the gears 21b and 23b or between the worm 24a,
Since the play between the worm wheels 23b is absorbed, the base 21 can be moved accurately.

In addition, in the embodiment, the record groove detection sensor 15
The drive means of the wire 13 is composed of a cover 18.
A connecting means between the wire 13 and the wire 13 is composed of a hook 17 and a pedestal 21, and the adjustment of the connecting means is made by rotating the rotating shaft 2.
3 and the adjusting screw 24, it goes without saying that other configurations may be adopted without departing from the concept of the present invention. Further, the rotating shaft 23 may be directly rotated by the tool 25 without using the adjusting screw 24, or a coin may be inserted into the groove 24b of the adjusting screw 24.

Effects of the Invention The present invention connects the cover that moves together with the pick-up arm and the drive means that drives the record groove detection sensor through an adjustable connecting means, and adjusts this connecting means from the outside to improve the pick-up. Since the relative positional relationship between the arm and the record groove detection sensor is variable, the distances between the stylus tip and the record groove detection sensor from the center of the record can be made equal with a simple operation.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a general linear tracking type record player, Figs. 2 and 3 are a conceptual diagram and a perspective view of main parts of a conventional record player, and Fig. 4 is an embodiment of the present invention. It is a perspective view of the main part of an example. 1...Turntable, 2...Operation knob, 3
... Player case, 4 ... Shaft, 5 ... Dust cover, 6 ... Pickup arm, 7 ... Cartridge, 8 ... Needle tip, 13 ... Wire, 15 ...
...Record groove detection sensor, 17...Hook, 1
8...Cover, 19...Shaft, 20...Bearing, 21
... Pedestal, 22 ... Spring, 23 ... Rotating shaft, 24 ... Adjustment screw, 25 ... Tool.

Claims (1)

[Claims] 1. A pick-up arm that moves linearly in the radial direction of the record, a cover that moves linearly together with the pick-up arm, a record groove detection sensor that moves linearly in the radial direction of the record, and a record groove detection sensor that moves linearly in the radial direction of the record. a connecting means for connecting a part of the driving means to the cover, and configured to move the record groove detection sensor in conjunction with movement of the pickup arm and the cover by the connecting means and the driving means, The connecting means is configured to be adjustable,
A record player in which the relative position of the pick-up arm and the drive means can be varied by the connection means.