JPS637975Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention drives the turntable by winding a belt around one of at least two pulleys with different diameters attached to the drive shaft and the rim of the turntable. This invention relates to a belt drive type record player in which the rotational speed of a turntable is changed by shifting the rotation speed from one of a plurality of pulleys to another.

Fig. 1 shows the configuration of a conventional belt drive type record player. 1 is a board of the record player, 2 is a small diameter pulley 3 on the upper side, and a large diameter pulley 4 on the lower side integrally arranged side by side. 5 is a rotating shaft of a motor (not shown) fixed to the back side of the substrate 1, and the rotating shaft 5 has the variable speed pulley 2 fixed to the tip thereof protruding from the substrate 1. 6 is a mounting plate installed perpendicularly to the board 1, 7
is a belt shifter in which a push-down piece 8 is protruded from the top of the tip and a push-up piece 9 is protruded from the bottom of the tip. Therefore, it is swingably attached to the mounting plate 6. Reference numeral 11 denotes an operating knob rotatably mounted on the substrate 1, and a cam mechanism (not shown), for example, is fixed to the lower part of the operating knob 11. Reference numeral 12 denotes a lever that is swingably attached to the back surface of the board 1. One end 12a of this lever 12 is engaged with the rear end of the belt shifter 7, and the other end (not shown) is connected to the operating knob 1.
1 cam mechanism. Reference numeral 13 denotes a torsion spring with one end fixed to the mounting plate 6 and the other end fixed to the rear end of the belt shifter 7.
The rear end portion of the belt shifter 7 is urged upward or downward to park the rear end portion of the belt shifter 7 in an upper or lower position. 14 is connected to the pulley 3 or 4 through between the push-down piece 8 and the push-up piece 9 of the belt shifter 7;
A belt wound around a rim (not shown) provided on the inside of the back surface of a turntable (not shown), 15
Reference numeral 16 indicates a notch hole drilled in the substrate 1 for passing the operating knob 11 therethrough, and a notch hole 16 made in the substrate 1 for passing the lever 12 therethrough.

In the conventional example configured in this way, the belt 14
When the belt 14 is wound around the pulley 3 and the rim of the turntable and the motor is driven, the turntable rotates at a low speed, for example, 33 rotations, and the belt 14 is wound around the pulley 4 and the rim of the turntable. When the motor is driven, the turntable rotates at high speed, for example, 45 revolutions. Also, when you want to switch the rotation speed of the turntable from low speed to high speed,
When the operating knob 11 is turned to swing the lever 12 and the tip of the belt shifter 7 is pivoted downward, the push-down piece 8 comes into contact with the upper end of the belt 14 and further moves the belt 14 downward. Therefore, the running belt 14 is guided from pulley 3 to pulley 4 and transposed (see FIG. 1), causing the turntable to rotate at high speed. Furthermore, when you want to switch the rotational speed of the turntable from high speed to low speed, turn the operating knob 11 to swing the lever 12, and then swing the tip of the belt shifter 7 upward, and the push-up piece 9 will move. In addition to contacting the lower end of the belt 14, in order to further press the belt 14 upward,
The running belt 14 is guided from the pulley 4 to the pulley 3 and dislocated, so that the turntable rotates at a low speed. By the way, the belt switching device consisting of the mounting plate 6, the belt shifter 7, the operating knob 11, the cam mechanism, the lever 12, the torsion spring 13, etc. has a drawback that the manufacturing cost is high due to the large number of parts and the number of assembly steps.

In order to eliminate the drawbacks of the conventional example, the present invention provides a belt drive type record player equipped with a switching lever in which an operation knob, a lever, and a belt shifter are integrally formed. below,
Examples of the present invention will be described in detail.

2 to 5 show the configuration of an embodiment of the present invention, in which the same reference numerals as those in FIG. 1 indicate the same parts, and 17 has a downward slope 18. A belt shifter 23 has a belt push-up member 21 having an upward slope 20 inclined in the same direction as the belt push-down member 19 and the downward slope 18 protruding from its tip, and a swing angle regulating hole 22 drilled in the tip. , is a switching lever in which an operating body 25 with an operating knob 24 protruding from the tip and an arm 27 with two latch notches 26 are integrally formed in a substantially T-shape, and the intersection of the switching lever 17 is There is a shaft hole 28 in the part.
is drilled. Reference numeral 29 denotes a shaft screw which passes through the shaft hole 28 of the switching lever 17 and is screwed onto the substrate 1. This shaft screw 29 pivotally supports the switching lever 17 so as to be able to swing freely. Reference numeral 30 denotes a pin protruding from the substrate 1, and this pin 30 is inserted into the deflection angle regulating hole 22 to regulate the deflection angle of the switching lever 17. 31 has the rear end as board 1
A leaf spring is fixed on the top, and the tip of the leaf spring 31 fits into the notch 26 to park the switching lever 17 in two positions.

In this embodiment configured in this way, when it is desired to switch the rotational speed of the turntable 32 (indicated by a dashed line in FIG. 3) from low speed to high speed, the third
In the figure, when the operating lever 24 is pushed from bottom to top and the switching lever 17 is swung clockwise,
The positions of the belt push-down member 19 and the belt push-up member 21 at the tip of the belt shifter 23 are moved from the position shown in FIG. 4 to the position shown in FIG. Therefore, the belt 14 is parked at that position, but when the downward slope 18 that intersects with the belt 14 is pushed onto the running path of the running belt 14, the upper end of the belt 14 that is wound around the pulley 3 is The downward slope 18 is pressed, and the belt 14 is guided downward by the downward slope 18 and transferred to the pulley 4, and the belt 14 is transferred to the pulley 4.
2 will start rotating at high speed. Further, when it is desired to switch the rotational speed of the turntable 32 to a high speed, pull the operating lever 24 from top to bottom and swing the switching lever 17 counterclockwise (see FIG. 3). The positions of the belt push-down member 19 and the belt push-up member 21 at the tip of the belt shifter 23 are moved from the position shown in FIG. 5 to the position shown in FIG. It was then parked in that position, but in the meantime,
When the upward slope 20 that intersects with the belt 14 is pushed onto the running path of the running belt 14, the upward slope 20 is pressed against the lower part of the belt 14 that is wound around the pulley 4, and the belt 14 is pushed onto the upward slope 20. is guided upward and transferred to the pulley 3, causing the turntable 32 to rotate at a low speed.

Furthermore, by providing the lower end of the downward slope 18 to a position lower than the upper end of the pulley 4, and by providing the upper end of the upward slope 20 to a position higher than the lower end of the pulley 3 (see FIGS. 4 and 5), belt 14
The dislocation of can be smoothed.

As described above, according to the present invention, since the belt switching device is only a switching lever, the number of parts and assembly man-hours are reduced, and manufacturing costs are reduced.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view showing the configuration of a conventional belt drive type record player, Fig. 2 is an exploded perspective view of an embodiment of the present invention, Fig. 3 is a plan view of an embodiment of the invention, and Fig. 4 Figures 1 and 5 are explanatory diagrams of the operation of an embodiment of the present invention, 2...speed change pulley, 3, 4...pulley, 5...
Rotating shaft, 14...belt, 17...switching lever,
18...Downward slope, 19...Belt pushing down member, 20...Upward slope, 21...Belt pushing up member, 23...Belt shifting, 24...Operation knob, 25...Operation body, 26...Off Missing, 27...
Arm, 29...shaft screw, 31...plate spring, 32...
Turntable.

Claims (1)

[Claims for Utility Model Registration] Driving the turntable by winding a belt around one of at least two pulleys with different diameters attached to the drive shaft in the vertical direction and the rim of the turntable, A belt drive type record player that changes the rotational speed of the turntable by displacing the belt from one of the plurality of pulleys to another, comprising: a belt pressing member having a downward slope; and the downward slope. The belt shifter has a belt push-up member at its tip that has an upward slope inclined in the same direction as the switching lever that is integrated with the operating body that has an operating knob at the tip, and this switching lever is swung by the board. a mounting member that is freely attached; and latching means for intermittently swinging the switching lever and parking the switching lever in at least two positions; When the intersecting downward slope and the upward slope are pushed onto the running path of the belt, the downward slope is pressed against the upper end of the belt that is wound around the upper pulley, and the belt is pushed onto the downward slope. The belt is transferred along the upward slope to the lower pulley, and the upward slope is pressed against the lower end of the belt that is wound around the lower pulley, and the belt is transferred along the upward slope to the upper pulley. The downward slope is provided with a protrusion whose lower end is located at a position lower than the upper end of the lower pulley, and the upward slope is provided with a protrusion whose upper end is located at a position lower than the upper end of the lower pulley. A belt drive type record player characterized in that a protrusion is provided at a position higher than the lower end of the upper pulley.