JPS6230169Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a record size selection mechanism for a record player, and is particularly devised so that its operation can be performed extremely easily.

The following will be described in detail with reference to embodiments shown in the drawings. 1
1 is a tone arm support shaft, to which a tone arm (not shown) and a tone arm lever 2 are fixed, and a record-sized selection lever 3 and a feed lever 4 are loosely fitted. The selection lever 3 cooperates with the switching lever 5 to guide the tone arm to the guide groove (playing start end) on the outermost circumference of the record, and has a pin 3d and a length of 30 cm.
A short hole 3a for a board, a medium hole 3b for a 25cm board, and a long hole 3c for a 17cm board are drilled in series. A pin 5a mounted on the switching lever 5 faces these through holes. That is, the switching lever 5 is normally positioned at a neutral position by the coil spring 7, and when the electromagnetic magnet 8a or 8b is turned on, the switching lever 5 is rotated about the shaft 6 and the pin is rotated. 5a is pressed against the left locking piece 9 or the right side locking piece 9', and the range of rotation of the selection lever 3 is restricted by the pin 5a, thereby selecting the record size. A lead-in lever 10 and a lead-out lever 11 are both rotatably supported on the feed lever 4 about a shaft 12, and both levers are positioned by a leaf spring 13.
The levers 10 and 11 engage with the pin 2b of the tone arm lever 2 and the pin 3d of the selection lever 3 to move the tone arm to the guide groove of the record at the beginning of the performance, and move the tone arm to the armrest at the end of the performance. Return to position. Furthermore, the 6th
As you can understand from the diagram, lead-out lever 1
1 engages only with pin 2d and does not engage with pin 3d. Pins 14 and 15 are pins for changing the direction of levers 10 and 11. The feed lever 4 is provided with a lower flat part 4b following a high flat part 4a and an inclined part 4c, and when the tone arm raising pin 16 is in contact with the high flat part 4a, the tone The arm is raised, and when it is in contact with the lower flat part 4b, the tone arm is lowered and enters the playing state. The figure number 4d is a cut groove drilled in the feed lever 4 to provide such a high level flat portion 4a.

Next, the operation will be explained.

FIG. 1 shows the stopped state. In the state shown in FIG. 1, the pin 5a faces the hollow hole 3b, and a 25 cm record is selected. When the electromagnetic magnet 8a or 8b is turned on, the pin 5a will face the short hole 3a or the long hole 3c, and the pin 5a will face the short hole 3a or the long hole 3c.
A 17cm record is selected. Therefore, in order to start playing the record, the drive circuit of, for example, a tone arm drive motor (not shown) is closed, and the communication member 17 is moved in the direction of the arrow in FIG. 1 in conjunction with the rotation of this motor. Then, the feed lever 4 connected to the communication member 17 by the pin 17a starts rotating clockwise. In the stopped state, the leaf spring 13 is in the position shown in FIG. 1 so that only the lead-in lever 10 can engage with the pins 2b and 3d.
It is positioned at . Therefore, the feed lever 4
When the lead-in lever 10 comes to engage with the pin 2b and the pin 3d, the tone arm lever 2 and the selection lever 3 also start rotating (see FIG. 2). The rotation range of the selection lever 3 is determined by a pin 5a set on the record size switching lever 5.
It is regulated by. That is, after the pin 5a comes into contact with the end of the short hole 3a, medium hole 3b, or long hole 3c provided in the selection lever 3, it is blocked by the rotating pin 5a of the selection lever 3 beyond that point. On the other hand, since the feed lever 4 continues to rotate, the lead-in lever 10 is eventually moved by the leaf spring 13 by the pin 3d.
Then, the lead-in lever 10 is disengaged from the pins 2b and 3d (see FIGS. 3 and 4). Therefore, from then on, only the feed lever 4 continues to rotate, and the selection lever 3 and tone arm lever 2 no longer rotate. In this way, the tone arm is moved to the guide groove of the record. When the feed lever 4 continues to rotate and rotates to a position where the lead-out lever 11 contacts the pin 15, the drive circuit of the tone arm drive motor is opened. At this point, the tone arm lifting pin 16 is exactly aligned with the feed lever 4.
Since the tone arm is located at the lower flat part 4b of the record, the tone arm descends onto the record and enters the playing state, and when the lead-out lever 11 comes into contact with the pin 15, the direction of the lead-out lever 11 is changed. The system enters a standby state for auto-return operation at the end of the performance (see FIG. 5).

During record playing, the tone arm lever 2 also rotates clockwise in FIG. 5 in response to the rotation of the tone arm. Now, when the tone arm starts scanning the silent groove of the record, the tip 2a of the tone arm lever 2 activates a well-known auto-return mechanism. For example, the drive circuit of the tone arm drive motor is closed again, and the communication member 17 begins to move in the direction of the arrow in FIG. 5 in conjunction with the rotation of the motor. Then, the feed lever 4 starts to rotate counterclockwise, but first, when the tone arm lifting pin 16 comes into contact with the upper flat part 4a, the tone arm rises above the record, and further leads out. When the lever 11 comes to engage with the pin 2b, the tone arm lever 2 rotates counterclockwise, and the tone arm rotates back toward the armrest position. When the tone arm comes into contact with the armrest base (not shown), further rotation of the tone arm lever 2 is prevented, but the feed lever 4 continues to rotate, so the lead-out lever 11 is eventually moved by the leaf spring. The direction is changed against 13.

When the feed lever 4 continues to rotate further and reaches a position where the lead-in lever 10 contacts the pin 14, the drive circuit of the tone arm drive motor is opened. At this point, the lead-in lever 1
0 is changed direction by the pin 14, and the tip 3e of the selection lever 3 is connected to the bent portion 17 of the connecting member 17.
When it comes into contact with b, it returns to the initial position shown in FIG. In this way, all operations for one cycle are completed.

According to the record size selection mechanism according to the present invention described above, it is sufficient to simply select the position of the pin on the switching lever, and since the switching lever does not touch any other mechanical members, the operation is easy. is extremely light. Then, the switching lever is the first
Since the position is determined by a coil spring and the other positions are determined by electromagnets, the record size can be changed using a touch switch or remote control.

[Brief explanation of drawings]

The drawings all show the record size selection mechanism of the record player according to the present invention, and FIGS. 1, 2, 3, 4, and 5 show the tone arm in different positions. FIG. 6 is a side view of the vicinity of the lead-in lever and lead-out lever. 2 is the tone arm lever, 3 is the selection lever, 4
1 is a feed lever, 5 is a switching lever having a pin 5a, 7 is a coil spring (biasing means), 8a,
8b is an electromagnetic magnet.

Claims (1)

[Scope of utility model registration request] A tone arm lever that rotates in response to the rotation of the tone arm, a selection lever that has multiple holes of different lengths connected to each other depending on the record size, and a pin that faces these holes. a switching lever having: a biasing means for positioning the switching lever so that the pin faces one of the holes; and a biasing means for positioning the switching lever so that the pin faces the other one of the holes. and a feed lever for rotating the tone arm lever and selection lever, and by rotating the feed lever, the tone arm lever and selection lever are rotated, and the selection lever is perforated. A record disc having a structure in which a record disc size is selected by the pin facing the provided hole, and a tone arm is positioned at the outermost circumferential groove position of the record disc in response to blocking rotation of the selection lever. Size selection mechanism.