JPS6316801B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fully automatic record player. It utilizes the cam surface of a cam body that has a gear part on the circumference and engages with the gear part of the turntable shaft and starts rotating in response to the operation of the start button/cut button and the detection of the end of a performance. It is well known that a lead-in operation (rotating the tone arm from an armrest position to a playing position) and a lead-out operation (rotating a tone arm from a playing position to an armrest position) of a tone arm is performed using a tone arm. The main feature of the present invention is that the aforementioned start button and cut button are used as a common button. Hereinafter, a detailed description will be given with reference to embodiments shown in the drawings.
First, the structure of a fully automatic record player according to the present invention will be explained with reference to FIGS. 1 and 2. FIG. 1 is a bottom view, and FIG. 2 is a side view, and in these figures, a tone arm (not shown) is fixed below the tone arm shaft 1. 2 is a turntable shaft for rotationally driving a turntable (not shown), and has a small gear 2a and a protrusion 2b. Reference numeral 3 denotes a cam body for performing lead-in and lead-out operations of the tone arm, and a large gear 3a that meshes with a small gear 2a is formed on the outer periphery. In the stopped state shown in FIG. 1, the small gear 2a faces the notch 3b of the large gear 3a, and the two do not mesh in any way. The cam body is provided with a cam groove 4, the details of which are shown in FIGS. 6 and 7. FIG. 7 is a sectional view taken along line XX' in FIG. The cam groove 4a in the range is used during the lead-out operation, and the cam groove 4b in the range is used during the lead-in operation, and is a shallow groove. Cam groove 4
C is a deep groove to prevent the tone arm from rotating again toward the playing position immediately after the lead-out operation is completed.
This will be explained in detail later. 4d is an inclined portion connecting the shallow cam groove and the deep cam groove. An operation switching lever 5 for selecting which of the cam grooves 4b and 4c to use is rotatably supported on the cam body 3 around a shaft 5a. has been planted. A tone arm lever 6 is fixed to the tone arm shaft 1, and rotation of the cam body 3 is transmitted to the tone arm lever 6 via a drive member 7. That is, the contact piece 7a (having a friction material at the tip) provided at one end of the drive member 7 contacts the tone arm lever 6, and the cam follower pin 7b provided at the other end contacts the cam groove of the cam body 3 . It is inserted in 4. The drive member 7 is rotatable about a shaft 8 and can see-saw about a fulcrum 8a. The drive member 7 is pressed against the fulcrum 8a of the seesaw by a spring coil (not shown), and is urged so that the cam follower pin 7b follows the cam groove 4. Now, in order to detect the position of the tone arm and position the operation switching lever 5 mentioned above, a first detection member 9 and a second detection member 10 are provided.
The position of the tone arm, that is, the position of the tone arm lever is detected, and in response to this, the operation switching lever 5 is positioned. The first detection member 9 is the chassis 11
It is rotatable about a shaft 9a set on the tone arm lever 6, and one end contacts a pin 6a set on the tone arm lever 6, and the other end contacts a through hole provided at one end of the second detection member 10. 10a. The second detection member 10 is rotatable about a shaft 10b installed in the chassis, and has a substantially X-shaped cam groove 10c (first 3) are formed. 12 is a stopper piece of the first detection member 9. Note that the reference number 13 is a tone arm lift shaft for raising the tone arm. Further, the cam body 3 is provided with two trigger means 14, 14' called a rawer trip pawl and an engagement pawl.
b, and thus the small gear 2a and the large gear 3a are brought into an engaged state. For example, this can be seen in
It is well known in JP 53-14165 and the like. Next, the structure of the operation mechanism of the power switch for driving the turntable, which is the gist of the present invention, will be explained with reference to FIG. The power switch 15 is a normally closed switch for the turntable drive motor, and is placed on a switch lever 16 that is rotatable about a shaft 16a. When the power switch 15 is in a stopped state with the tone arm at the armrest position (the state shown in FIG. 8), one end of the switch control lever 17
Since it is in contact with 5a, it is in the off state. That is, the switch control lever 17 is rotatable about the shaft 18, and in the stopped state, the other end is in contact with the bent piece 6b of the tone arm lever 6, so that one end is in contact with the operating piece 15a. Therefore, the power switch 15 is set to the OFF state. The switch actuating member 19 is guided by the shaft 18 and the guide hole 19a and slides when the start/cut button (not shown) is operated and the wire 20 is pulled in the direction of the arrow shown in the figure during a start operation or a cutting operation. It is something that moves. A cam piece 19b is formed on the switch operating member 19, and when the operating member 19 slides downward as shown in FIG. The lever 16 is rotated counterclockwise against the spring 16c, and the contact between the operating piece 15a and the switch control lever 17 is released, and the power switch 15 is turned on. Furthermore, the trigger lever 22 is rotated counterclockwise about the fulcrum 21 by the bent portion 20a of the wire 20, so that its right end is connected to the aforementioned trigger means 14,
14', the small gear 2a and the large gear 3a are brought into engagement, and the cam body 3 starts rotating to perform a lead-in operation or a lead-out operation.
In addition, if you operate the start/cut button to stop the performance and perform the lead-out operation while the record is playing, the power switch 15 is already in the on state, so operating the start/cut button will start the small gear. Only the engagement between the large gear 2a and the large gear 3a is achieved, but this will become clear later in the description. Next, the operation will be explained. 1 and 8 show the tone arm in a stopped state on the armrest stand. At this time, one end of the first detection member 9 is in contact with the pin 6a on the tone arm lever 6 and is in the position shown in FIG.
b engages with the X-shaped cam groove 10c of the second detection member 10. When the cam body 3 rotates from this state, the position of the operation switching lever 5 does not change at all. That is, since the operation switching lever 5 closes the entrance of the cam groove 4c and opens the entrance of the cam groove 4b, the cam groove 4b is in a selected state. Then, when the start/cut button (not shown) is operated, the power switch 15 is turned on as described above, the turntable shaft 2 starts rotating, and the cam body 3 also starts rotating in the direction of the arrow shown in the figure. FIG. 9 shows the state immediately after the start. Since the switch actuating member 19 is held in the position shown in FIG. remains on. That is, the cam body 3
When the lock member 23 rotates, one end of the locking member 23 becomes the outermost peripheral surface 24a of the cam surface 24 formed on the cam body 3 .
The lock member 23 rotates counterclockwise around the shaft 25, and the other end of the lock member 23 comes into contact with the boss 19c on the switch actuating member 19, thereby preventing the switch actuating member 19 from returning. Since the boss 16b of the lever 16 is in contact with the cam piece 19b, the power switch 15 remains in the on state. Now, due to the rotation of the cam body 3 , the pin 7b is moved into the deep groove 4.
When the drive member 7 comes to engage with the shallow groove 4a from the position c, the drive member 7 seesaws around the fulcrum 8a. Therefore, the contact piece 7a contacts the surface of the tone arm lever 6 and the tone arm lift shaft 13
moves in the direction of the arrow shown in FIG. 2, and the tone arm rises from the armrest base. By the way, pin 7b
When the cam body 3 is rotating with the cam body 3 engaged with the cam groove 4a in the range of the cam body 3 , the drive member 7
Since the pin 7b moves toward the center of the cam body 3 , it rotates counterclockwise about the shaft 8. Normally, the counterclockwise rotation of the driving member 7 causes the tone arm lever 6 in contact with the abutment piece 7a to rotate in the direction of arrow a shown in the figure (this is the lead-out direction), but at this point Since the tone arm is in the armrest position, the tone arm lever 6 does not rotate at all, and the drive member 7 rotates counterclockwise with the abutment piece 7a slipped (see FIGS. 3 and 4). (see figure). Now, when the pin 7b comes to engage with the cam groove in the cam body 3 , the pin 7b is guided toward the cam 4b by the operation switching lever 5 as described above, and the contact piece 7a is brought into contact with the tone arm lever 6. In the state of contact, the pin 7b moves in the direction away from the center of the cam body 3, so that the drive member 7 reverses and starts rotating clockwise. In response to the clockwise rotation of the drive member 7, the tone arm lever 6 is rotated in the direction of arrow b in the figure, and a lead-in operation of the tone arm is performed. During the lead-in operation, the rotation range of the tone arm lever 6 is regulated by the well-known pin 26a on the record size selection lever 26, so when the tone arm is rotated to the end where the record starts playing, Subsequent rotation of the tone arm lever 6 is prevented, and the tone arm lever 6 continues to rotate clockwise with only the contact piece 7a slipping. That is, when the cam body 3 rotates until one end of the lever 27 comes into contact with the range 24b of the cam surface formed on the cam body 3 , the lever 27 rotates counterclockwise about the shaft 27a, and responds to this. Then, the size selection lever 26 moves clockwise to restrict the rotation range of the tone arm lever 6. The movement position of the size selection lever 26 is specified by moving the size setting member 28 having a stepped portion 28a in the direction of the arrow shown in the figure, and the pin 26a is in contact with the rotating tip 6c of the tone arm lever 6 or the rotating tip is moved. The record size selection operation is achieved by contacting 6d. Now, when the tone arm moves from the armrest stand to the record playing start position by the lead-in operation, the pin 6a on the tone arm lever 6 and the first
Since the contact relationship with one end of the detection member 9 is released,
The first detection member 9 is moved clockwise by a spring,
Further, the second detection member 10 rotates counterclockwise and moves to the position shown in FIG. Therefore, 1 of the cam body 3
Just before the end of the rotation, the pin 5b on the operation switching lever 5 is guided again to the X-shaped cam groove 10c provided in the second detection member 10, and as a result of the counterclockwise rotation of the second detection member 10, the pin 5b is finally The operation switching lever 5 rotates counterclockwise around the shaft 5a, and rotates in the cam groove 4b.
Since the inlet of the cam groove 4c is closed and the inlet of the cam groove 4c is opened, the cam groove 4c is switched to the selected state. This switching of the operation switching lever 5 is further facilitated by the pin 7b coming into contact with the side surface 5' of the operation switching lever 5. In the state where the pin 7b passes through the inclined portion 4d and moves to the deep cam groove 4c, the driving member 7 moves to the fulcrum 8.
The record seesaws around point a, and the contact piece 7a and tone arm lever 6 are released from contact, and the tone arm lift shaft 13 also descends (moves in the opposite direction of the arrow in FIG. 2). will be in the playing state. Furthermore, just before the end of one rotation of the cam body 3 , both the lever 27 and one end of the locking member 23 fall into the recess 24c of the cam surface 24.
The lever 27 is further rotated counterclockwise by the spring 29, and its bent portion 27b comes into contact with the locking member 23. Therefore, the lock member 2 rotating clockwise
3, the switch actuating member 19 returns to its initial state and the boss 16b of the lever 16 is released from contact with the cam piece 19b, so that the switch lever 16 is also rotated clockwise by the spring 16c. At this time, the tone arm has already rotated to the performance position, the contact between the tone arm lever 6 and the switch control lever 17 is released, and the switch control lever 17 is in a free state.
Even if the power switch 15 is rotated clockwise, the power switch 15 will not be turned off. When the cam body 3 completes one revolution, the small gear 2a faces the notch 3b of the large gear 3a, and the rotation of the cam body 3 stops (see FIGS. 5 and 10). At this time,
One end of the lever 27 is again connected to the outermost peripheral surface 2 of the cam surface 24.
4a, the size selection lever 26 is rotated counterclockwise by this lever 27, and the rotation range of the tone arm lever 6 is no longer restricted by the pin 26a. That is, the tone arm lever 6 is freely rotatable and enters the record playing state. Now, in response to the operation of the start/cut button at the end of the record playing or during the record playing, the small gear 2a and the large gear 3a are brought into mesh again, and the rotation of the cam body 3 is started, and the lead of the tone arm is An out action is made. That is, when the record playing is finished, the pin 6e of the tone arm lever 6 comes into contact with the trigger lever 22 (see Fig. 8), and when the start/cut button is operated, the bent part 20a of the wire 20 comes into contact with the trigger lever 22 (see Fig. 8). 22, the small gear 2a and the large gear 3a are brought into engagement. In response to the rotation of the cam body 3 in a state in which the pin 7b is engaged with the cam groove 4a in the range of the cam body 3 , the tone arm lever 6 rotates in the direction of the arrow a, and a lead-out operation is performed to perform the tone It is clear from the previous description that the arm is returned to the armrest position. When the tone arm returns to the armrest position, the tone arm lever 6 and the switch control lever 17 are in contact again, but at this time, one end of the lock member 23 is in contact with the outermost circumferential surface 24a of the cam surface of the cam body 3 . Since the cage switch operating member 19 is in the position shown in FIG. 9, the power switch 15 will not be turned off. When the pin 7b comes to engage with the cam groove in the range of the cam body 3 , the operation switching lever 5 moves the pin 7b
is guided to the cam groove 4c side. By the way, cam groove 4c
Since this is a deep groove, the driving member 7 moves in a seesaw manner, and the abutting relationship between the abutting piece 7a and the tone arm lever 6 is released. Therefore, the cam groove in the range 4
c, the lead-in operation of the tone arm is not performed, and the tone arm remains located at the armrest position. Now, when the tone arm returns to the armrest position, the pin 6a on the tone arm lever 6 and one end of the first detection member 9 are brought into contact again, and the first detection member 9 and the second detection member 10 are again in contact with each other. Move to the position shown in the diagram. Therefore, when the cam body 3 makes approximately one rotation, the pin 5b on the operation switching lever 5 is guided to the X-shaped cam groove 10c provided in the second detection member 10, and eventually the operation switching lever 5 again selects the cam groove 4b. state (the position shown in FIG. 1). This switching is further facilitated by the pin 7b coming into contact with the side surface 5'' of the operation switching lever 5, as described above.As is clear from the above description, just before the end of one rotation of the cam body 3 , Although the power switch 15 is turned off by the clockwise rotation of the member 23, the cam body 3 continues to rotate slightly due to the inertia of the turntable, and reaches the position shown in FIGS. 1 and 8, that is, complete rotation. When the engagement state between the small gear 2a and the large gear 3a is released, the rotation is stopped and everything returns to the initial state.As explained above, according to the present invention, the start and the By operating the cut button, the power switch of the turntable shaft drive motor is turned on, and the trigger means is activated to start the rotation of the cam body to perform the lead-in operation, and also to cut the record. Sometimes, by operating the start/cut button, the trigger means can be activated to start the rotation of the cam body and execute the lead-out operation, and when the lead-out operation is finished, the switch control lever is activated. This allows the power switch to be turned off reliably. Therefore, the lead-in and lead-out operations of the tone arm can be performed without malfunction using a single start/cut button, which is extremely convenient. It is useful.

[Brief explanation of the drawing]

The drawings all show a fully automatic record player according to the present invention, and FIG. 1 is a bottom view in a stopped state, FIG. 2 is a side view of the same, and FIG. 3 is a bottom view after the cam body starts rotating. Figure 4 is a side view of the same side, Figure 5 is a bottom view in the playing state, Figure 6 is a diagram showing the shape of the cam groove, Figure 7 is a sectional view taken along line X-X' in Figure 6, and Figure 8 ,
9 and 10 show the structure of the operating mechanism of the power switch, FIG. 8 shows the stopped state, FIG. 9 shows the cam body immediately after it starts rotating,
FIG. 10 is a diagram showing the performance state. 1 is the tone arm axis, 2 is the turntable axis,
3 is the cam body, 6 is the tone arm lever, 14,1
4' is a trigger means, 15 is a power switch, 16
is the switch lever, 17 is the switch control lever,
19 is a switch operating member.

Claims (1)

[Claims] 1. (a) A cam body that rotates once when engaged with a turntable shaft by a trigger means; (b) A cam follower pin at one end engages with a cam groove of the cam body. (c) a drive member that is rotatable in the radial direction as the cam body rotates, and is also provided to allow seesaw movement due to the difference in depth of the cam groove; (c) seesaw movement of the drive member; (d) a tone arm lever that rotates the tone arm in a lead-in direction or a lead-out direction in relation to the rotation of the drive member; e) an operation switching lever rotatably provided on the cam body to switch the engagement path of the follower pin of the drive member with the cam groove of the cam body to a first engagement path or a second engagement path; (f) detecting the armrest position of the tone arm, setting the operation switching lever so that the follower pin moves along the first engagement path of the cam groove, and detecting movement of the tone arm to the playing position; (g) a position detection member for setting the operation switching lever so that the follower pin moves along the second engagement path of the cam groove; and (g) a power switch for a motor for driving the turntable shaft. (h) a switch control lever that comes into contact with the tone arm lever when the tone arm is in the armrest position and sets the power switch to the OFF state; (i) a switch lever that serves as a start and cut lever; (j) a switch actuating member that rotates the switch lever in response to a button operation to turn on the power switch and actuates the trigger means to engage the cam body with the turntable shaft; (j) When the following pin of the driving member moves through the first engagement path of the cam groove due to the start of rotation of the cam body based on the operation of the start/cut button, the driving member raises the tone arm lift shaft and moves the tone arm lever. (k) When the cam body starts rotating based on the start/cut button operation, the following pin of the driving member moves into the second engagement of the cam groove. When moving along the merge path, the driving member is configured to raise the tone arm lift shaft, rotate the tone arm lever in the lead-out direction, and then lower the tone arm lift shaft and turn off the power switch. A fully automatic record player featuring: