JPS6230170Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a record disc size selection mechanism for a record player, and is particularly designed to have a simple structure and to be extremely easy to operate.

A detailed description will be given below 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 positioned on the switching lever 5 faces these through holes. That is, the switching lever 5 is normally positioned at a neutral position by a coil spring 7, and the switching lever 5 is rotated about a shaft 6 by an electromagnetic means 8 (see FIG. 7), which will be described later, so that the pin 5a is moved to the left or to the left. The selection lever 3 is rotated to the right, 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.
As can be understood from FIG. 6, the lead-out lever 11 engages only the pin 2b and does not engage the pin 3d. Pins 14 and 15 are levers 10 and 11
This is a pin for changing direction. The feed lever 4 is provided with a lower flat portion 4b following a higher flat portion 4a and an inclined portion 4c, and when the tone arm raising pin 16 is in contact with the higher flat portion 4a, the tone arm is raised. and the lower flat part 4
When in contact with b, the tone arm descends and enters the playing state. The drawing number 4d is such a high level flat part 4a.
This is a cut groove drilled in the feed lever 4 to provide a .

Next, the operation will be described.

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. If the electromagnetic means 8 is set to the on state, pin 5
A faces the short hole 3a or the long hole 3c, and a 30cm record disc or a 17cm record disc 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 through the pin 17a starts rotating clockwise.
In the stopped state, only the lead-in lever 10 is positioned by the leaf spring 13 so that it can engage with the pins 2b and 3d, that is, at the position shown in FIG. 1. Therefore, when the feed lever 4 rotates and the lead-in lever 10 comes to engage with the pins 2b and 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 regulated by a pin 5a set on the record size switching lever 5. 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, further rotation of the selection lever 3 is prevented by the pin 5a. On the other hand, since the feed lever 4 continues to rotate, the lead-in lever 10 eventually
is caused to change direction by the pin 3d against the leaf spring 13, and thus the lead-in lever 10 and the pin 2
b, 3d are disengaged (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 positioned at the lower flat portion 4b of the feed lever 4.
Since the tone arm is located at It enters a standby state for return operation (see Figure 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 rotating 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 then the lead-out 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 10
is changed direction by the pin 14, and the tip 3e of the selection lever 3 is connected to the bent portion 17b of the connecting member 17.
When it comes into contact with , it returns to the initial position shown in FIG. In this way, all operations for one cycle are completed.

Now, the gist of the present invention lies in the electromagnetic means 8 for positioning the pin 5a with respect to the holes 3a, 3b, 3c provided in the selection lever 3. That is, as shown in FIG. 7, the electromagnetic means 8 according to the present invention has a permanent magnet 8.
a, and a moving coil 8b placed within the magnetic field of this permanent magnet 8a.

Therefore, the effects of the present invention are as follows. For example, if the pin of the switching lever corresponds to the center hole of the selection lever in a neutral state with no current flowing through the moving coil, in order to make the pin correspond to the left and right holes, the direction of the current flowing through the moving coil is reversed. Just make it 3
Various sizes can be selected, and the structure and operation are extremely simple. Also, if the pin corresponds to the hole at one end in the neutral state, the same three sizes can be selected by keeping the direction of the current flowing through the moving coil constant and switching the strength to two levels. be.

Furthermore, the record player is used while being held horizontally, and there is some friction in the rotation of the switching lever 5 (it does not rotate completely freely).
Therefore, focusing on this point, by omitting the coil spring 7 for positioning and lightening the load on the switching lever 5, the operation can be further lightened. That is, since the selection lever 3 returns to the initial position during auto-return as described above, if the selection lever 3 is provided with the positioning cam 3f as shown in FIG. It is positioned at a fixed position by the positioning cam 3f, so that the coil spring 7 for positioning can be omitted.

[Brief explanation of the drawing]

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. 6 is a side view of the vicinity of the lead-in lever and lead-out lever, FIG. 7 is a detailed view of the electromagnetic means which is the gist of the present invention, and FIG. 8 is a view showing another embodiment. 2 is a tone arm lever, 3 is a plurality of holes 3a,
3b, 3c and a selection lever having a positioning cam 3f; 4 a feed lever; 5 a switching lever having a pin 5a; 8 an electromagnetic means.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A tone arm lever that rotates in response to the rotation of the tone arm, and a plurality of holes with different lengths corresponding to the size of the record disc are drilled in series. a switching lever having a pin facing the hole; a positioning means provided for positioning the switching lever so that the pin faces one of the holes; an electromagnetic means comprising a magnet provided to position the switching lever so as to face the other one, and a moving coil disposed within the magnetic field of the magnet; and an electromagnetic means for rotating the tone arm lever and the selection lever. the tone arm lever and the selection lever are rotated by the feed lever, the record size is selected by the pin facing the hole formed in the selection lever, and the record size is selected by the pin facing the hole drilled in the selection lever; A record size selection mechanism configured to position a tone arm at the outermost groove position of a record in response to blocking rotation of a lever. (2) The positioning means is provided in contact with the pin of the switching lever and facing the hole of the selection lever in order to position the pin of the switching lever at a predetermined position of the selection lever in a neutral state in which no current is applied to the movable coil. The record size selection mechanism according to claim 1, which is a positioning cam. (3) The selection lever is provided with three holes, and in the neutral state where no current is passed through the moving coil, the pin of the switching lever faces the center hole of the selection lever, and the current flowing through the moving coil is 2. The record size selection mechanism according to claim 1, wherein the pins are positioned at the remaining two positions based on the difference in direction of the pins. (4) The selection lever is provided with three holes, and in the neutral state where no current is passed through the moving coil, the pin of the switching lever faces the hole at one end of the selection lever, and the moving coil is 2. The record size selection mechanism according to claim 1, wherein the pin is positioned at the remaining two positions based on the difference in the strength of the applied current.