JPS6141162Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pick-up feeding device such as a video disc player. Since a video disc player requires various modes such as normal play forward, fast forward, and fast rewind, it is necessary to change the pickup speed by some means. However, in the past, when switching the pick-up feed speed by changing the motor rotation speed, it was not possible to obtain a sufficient speed ratio.
In addition, a complicated speed reduction mechanism is required when changing the speed reduction ratio of the speed reduction mechanism while keeping the rotational speed of the motor constant. The present invention was developed in view of the above points, and even if a general-purpose small motor is used, the pick-up feed speed can be switched to two or more speeds using a relatively small and simple speed reduction mechanism that utilizes differential feed of screws. The present invention provides a pick-up feeding mechanism that can be used. An embodiment of the present invention will be described below with reference to the drawings. Figure 1 A, B, and C are respectively a plan view, a side view, and a back view of the pick-up feeding device during normal feeding;
FIGS. 2A and 2B are a side view and a rear view, respectively, in fast forward mode, and FIG. 3 is a sectional view of the main part. In the figure, reference numeral 1 denotes a mounting base that supports a fixed shaft 2 and a rotating shaft 3 that are parallel to each other, and the rotating shaft 3 has a screw 3a in the circumferential direction and one groove 3b in the axial direction, and is rotatable. 4
5 is a first gear that can rotate by engaging with the screw 3a of the rotating shaft 3 , and 5 is a gear that has a smaller number of teeth than the first gear 4 (1
~2) It is a second gear that has many protrusions 5a on its inner surface that engage with the grooves 3b of the rotating shaft 3 and is slidable in the axial direction. Reference numeral 6 denotes a feed bar that is slidably mounted on both the shafts 2 and 3 , and 7 and 8 indicate a feed bar that is provided at the bottom of the feed bar 6 and that is slidably engaged with the fixed shaft 2. 1 bearing and the first gear on the rotating shaft 3
This is a second bearing rotatably engaged with the flange portion 4a of No. 4 . A pick-up holder 1 rotatably supports a pick-up 9 on the feed base 6.
0, a drive motor 11 and a solenoid 12 are arranged; 13 is a worm connected to the shaft of the motor 11 and can be engaged with the first and second gears 4 and 5 ; 14 is a worm that is interlocked with the solenoid 12; This is a slide lever that is slidable in the direction of the rotating shaft 3 and that engages with the flange portion 5b of the second gear 5. 15 is a rotation stopper that stops the rotation of the second gear 5 . Next, the operation of the pick-up feeder having such a configuration will be described. First, during normal reproduction feeding, the first gear 4 is always engaged with the rotating worm 13, as shown in FIG. 1, and when the solenoid 12 is energized, the slide lever 14 slides in the direction A in the figure. , the second gear 5 also slides and the worm 1
3. At this time, the protrusion 14a of the slide lever 14 pushes up the rotation stopper 15 that has been engaged with the second gear 5 to release the engagement, thereby making the second gear 5 freely rotatable. At the same time, a pick-up rotating mechanism (not shown) is operated in conjunction with the slide lever 14 to press the pick-up 9 into contact with the disk. When the second gear 5 engages with the worm 13 and rotates, the rotating shaft 3 that engages with the protrusion 5a of the second gear 5 simultaneously rotates in the same direction as the first gear 4 .
Since the number of teeth of the second gear 5 is greater than the number of teeth of the first gear 4 , the rotating shaft 3 rotates a little slower than the first gear 4 . Therefore, the feed table 6, which is integrated with the first and second gears 4 and 5 , is transferred on the rotating shaft 3 at a relatively slow predetermined speed. Next, the operation during fast forwarding is as shown in Figure 2.
The solenoid 12 is de-energized and the slide lever 1
4 slides in the direction B in the figure, and the second
The gear 5 also slides and separates from the worm 13.
At this time, the rotation stopper 15, which had been pushed up by the protrusion 14a of the slide lever 14 , moves to the protrusion 14a.
By separating from this, the second gear 5 and the rotating shaft 3 are engaged with the teeth of the second gear, and the rotation of the second gear 5 and the rotating shaft 3 is stopped. Then, the pick-up 9 is separated from the disk.
However, since the first gear 4 is always engaged with the worm 13 and rotates, when the rotating shaft 3 stops, the feed bar 6 is rapidly fed at a much higher speed than the normal fast feed rate. become. In addition, quick return is also possible by reversing the drive motor 11 at the same time as the rotating shaft 3 stops. As mentioned above, the pick-up feeder of the present invention uses differential screw feeding for the reduction mechanism, so it can perform normal playback feed speed and very high speed fast feed or fast forwarding at a rotation speed within the usage range of a general-purpose small motor. Return speed can be obtained. Furthermore, the mechanism is simple and the number of parts is small, allowing for miniaturization.

[Brief explanation of the drawing]

The drawings all show one embodiment of the present invention, and Fig. 1 A, B, and C are respectively a plan view, a side view, and a back view of the pick-up feeder during normal feeding, and Fig. 2 A, B are respectively The same side view and back view during fast forwarding, and FIG. 3 are cross-sections of essential parts. Explanation of main drawing numbers, 3 ...Rotating shaft, 4 ...First gear, 5 ...Second gear, 6...Feed stand, 9...Pickup, 11...Drive motor, 12...Solenoid, 13 ... Worm, 14 ... Slide lever, 15 ... Rotation stopper.

Claims (1)

[Scope of utility model registration request] A rotatable rotating shaft having a thread in the circumferential direction; a first gear having a number of teeth Z ₁ whose inner surface meshes with the thread of the rotating shaft disposed coaxially with the rotating shaft; A second gear having a number of Z ₂ teeth which is different in number and always integral with the circumferential direction of the rotating shaft and slidable in the axial direction; A feed table movable in the axial direction of the rotating shaft to transfer the table, a drive source disposed on the feed table for driving the first and second gears, and a coupling between the drive source and the second gear. Alternatively, a pick-up feeding device comprising a clutch means for separating the gears, and a rotation stop means for stopping the rotation of the second gear and the rotating shaft in conjunction with the clutch means.