JPS6014401B2 - releasable needle arm coupling device - Google Patents

Description

[Detailed Description of the Invention] This invention provides a video disc player (playback device)
and in particular to releasable coupling means between the connecting plate of the needle arm unit and the support member of the player.

U.S. Pat. No. 3,917,903 to Taylor et al. discloses a method for removably attaching a needle arm to a video disk player (of the type described in U.S. Pat. No. 21, No. 21). A magnetic coupling means for this purpose is described.

However, with the above-mentioned magnetic coupling means, the support member and the needle arm must be coupled by direct manual operation.
Such manual joining requires skill and is inconvenient. Therefore, in order to eliminate the drawbacks of the above magnetic coupling means, the present invention provides a method for imparting reciprocating motion to the support member during the reproducing operation so as to cancel the deviation of the relative speed between the needle and the cord board from a predetermined speed. The reciprocating motion imparting means of the cartridge is moved relative to the cartridge IJ, so that the support section and the needle arm are automatically and precisely connected only when the cartridge is accommodated in the chamber of the carriage. The purpose is to provide a combined bag counterfeit service.

The releasable needle arm coupling device of the present invention is installed and moved laterally relative to the substrate in conjunction with lateral movement of a needle (e.g., needle 55) on the track during a playback operation. (e.g. room 44).
For example, a carriage 34), a needle arm (for example, needle arm 51) holding the needle at one end, and a support member (for example, support member 64) disposed within the carriage, and is rotatable with respect to the substrate. A vinyl record with a counterfeit spiral track on a turntable (
For example, it is used in a device for reproducing signals prerecorded on a record (31), and includes:
a first coupling element (e.g. connecting plate 54) fixed to the other end of said needle arm; configured to be received in said chamber and forming a protective enclosure for said needle and said needle arm; means for resiliently suspending said first coupling element within said cartridge; means (e.g. elastic strips 57, 58) for positioning the first coupling element in a relationship such that it is aligned with the support village when housed in the chamber; means (e.g. arm stretcher 46) movably disposed within said carriage for imparting reciprocating motion to said support section during a regeneration operation so as to counteract deviations from a predetermined speed of said cartridge; The reciprocating force is applied to the cartridge such that the support member and the first coupling element are releasably coupled and in such a manner that the reciprocating movement can be accurately transmitted from the support member to the needle. A means (for example, a cam 67) for moving the motion imparting means is provided.

If the support member is subjected to periodic motion in order to correct for speed errors between the needle and the record rotatably mounted in the brake, the periodic motion can be faithfully transmitted. Therefore, it is particularly important to ensure sufficient bonding between the supporting portion and the connecting plate.

In U.S. Pat. No. 3,711,641 an "arm stretcher" device for imparting periodic movements to a support member is described. The invention will now be described with reference to the drawings.

FIG. 1 shows a video file in the general format shown in US Pat.
Shows the disc player. The record disc 31 is rotatably mounted on a turntable 32 fixed to a motor mounting plate 33. The carriage (carriage) 34 moves against the motor mounting plate 33 in relation to the lateral movement of the needle 55 (FIG. 2) mounted on the spiral track 35 formed on the surface of the record player 31 during the playback operation. It is installed so that it can move laterally. Slot 36 on motor mounting plate 33
and 37 are formed so that the carriage 34 can be moved laterally from a rest position 38 away from the record to a playback position on the record. It's on the track while it's playing. Carriage 34 with respect to needle 55
Reference is made to U.S. Pat. When the carriage 34 is in a rest position 38 away from the record rack, a hinged plate 40 overlies the carriage. There are five basic rooms in the carriage 34. Rooms 41, 42
, 43 is the signal processing circuit of the playback device, i.e., 'a' is a resonant circuit that constitutes a tuning circuit by the needle electrode and the capacitance of the chord board, {b) the oscillator that supplies the UHF oscillation signal to the tuning circuit, and [c' from the tuning circuit. Each circuit board is assigned to accommodate each circuit board for each element of the preconverter amplifier that responds to the detected form of the extracted modulated oscillation signal. The chamber 44 houses a replaceable pickup cartridge 45, a telescoping arm stretcher 46, and a needle arm lifter 47. The arm stretcher may be of the type shown in US Pat. No. 3,711,641. Room 48 constitutes a wiring channel for holding lead wires to various circuit boards. Cartridge 45 contains an insert molded needle arm unit 50 as shown in FIG.

The insert-molded needle arm unit has a needle arm 51 formed of aluminum tubing (e.g., approximately 0.61 rib outside diameter, approximately 51 microns thick);
One end of 1 is fixed to a plastic needle holder 52,
A mirrored member 53 is molded at the other end, thereby connecting needle arm 51 to metal connecting plate 54 . The sacrificial member 53 remains unstrained when aligning the needle arm 51. The angle between the needle arm 51 and the connecting plate 54 is wide for reasons described below. It becomes. Plastic needle holder 52 includes a slot for holding needle 55 secured in place. A small protrusion 56 is attached to the top of the plastic stylus holder 52, which allows the stylus 55 to be moved into the locked groove of the record 31 (some grooves may be damaged due to scratches, etc.) when the spiral track consists of grooves. It connects with the outer groove and engages an actuator 49 (FIG. 6) for releasing the needle from the passage of the same groove over and over again. The structure for suspending needle arm unit 50 within cartridge 45 is described below with reference to FIGS. 3 and 4.

A pair of elastic strips 57 and 58 are secured to connecting plate 54 of needle arm unit 50 as shown in FIG.
Elastic strips 57 and 58 are secured to a pair of inclined support surfaces 59 and 60' provided at the rear end of cartridge 45. The mirrored support surfaces 59 and 60 are set at an angle 80 between the connecting plate 54 and a direction perpendicular to the bottom surface of the cartridge 45. FIG. 7 shows an inclined support surface 60. Cartridge 45 is further provided with a conductive ribbon-like leaf spring 61 which urges stylus 55 toward record track 35 as shown in FIG. 12 during playback.

One end of the spring 61 is fixed to the needle 55 in electrical contact with an electrode contained within the needle. Leaf spring 61
The pond end is fixed to the free end 62 of the cantilever beam 63. As shown in FIG. 1, slots 164 and 65 are formed in the top wall of cartridge 45 so that the spring-like portion of the top wall acts as a cantilever. In this particular embodiment, cantilever 63 is integral with cartridge 45, but it could also be provided separately on the top wall of the cartridge. The position of the free end 62 of the cantilever 63 relative to the bottom of the cartridge, the structure of the leaf spring 61 protects the needle arm 51 so that it is held in a retracted position within the cartridge (FIG. 8). It looks like this.

This retracted position provides for the needle 55 to be retracted into the portion of the cartridge 45 away from the dirty barrier formed in the bottom surface of the cartridge. When the carriage 34 is away from the record or in the set position 38 (FIG. 11) and the playback position (FIG. 12) on the record;
The needle 55 protrudes from the above-mentioned hole. When the cartridge 45 is outside the recycler (FIG. 7) or inside the recycler but not engaged with the arm stretcher 46 (FIG. 8), the needle arm 51 is retracted within the cartridge. It is in a protected position.

When you are in any of these positions, you can
will not bend or be under pressure, thus preventing the mirror from becoming permanently bent into a bowed shape that would cause the needle 55 to mistrack during playback. 7th
12A to 12C show a series of installation operations of the cartridge 45 within the compartment 44 of the carriage.

As can be seen in FIG. 7, the arm stretcher 46 has a support village 64 which engages the connecting plate 54 of the cartridge 45 when the cartridge is accommodated in the compartment 44 of the carriage. . Arm stretcher 46 is slidably mounted within carriage compartment 44 and is responsive to movement of carriage lid 65.
The lid 65 is movable between a retracted position when it is open (FIG. 7) and a closed extended position of the carriage lid. Coil spring 66 coupled between arm stretcher 46 and carriage 34
returns the arm stretcher to the retracted position when the carriage lid 65 is opened. FIG. 5a shows a device for moving arm stretcher 46 within carriage chamber 44 to ensure engagement between support member 64 and connecting plate 54.

A cam 67 is attached to the carriage 34, and the cam 67 responds to movement of the carriage lid 65 to engage the pivot pin P.
Rotate around the center. The circumferential surface of the cam 67 is connected to the arm stretcher 46 to create a relative displacement between the arm stretcher and the carriage 34. Portion 68 of arm stretcher 46 is allowed to be slightly overtraveled by cam 67. Furthermore, this part 68 is
The arm stretcher 46 is adapted to act elastically on the cartridge 45 so that the cartridge occupies a correct position in the carriage chamber when the carriage lid 65 is closed. Furthermore, the presence of this portion 68 allows for some deviation in the dimensions of arm stretcher 46, cartridge 45, and carriage chamber 44. FIG. 5b shows arm stretcher 46 in carriage chamber 44 to ensure engagement between support member 64 and connecting plate 54.
Another embodiment of the device for moving the is shown.

The mover of FIG. 5b is similar in operation to the mover of FIG. 5a, except that the return spring 66 is not required. In the mobile device of FIG. 5b, the carriage lid 65 and cam 67 are fixedly attached to a stop pin rotatably attached to the carriage 34.
When the carriage lid 65 is opened, the cam 67 rotates to pull the arm stretcher 46 back to the retracted position. 8th
FIGS. 12A-12C show that the chamber 4 of the carriage is
The operation of yet another embodiment of the device for moving an arm stretcher 46 within 4 is shown.

As shown in FIG. 8, the cartridge 45 is repositioned into the carriage chamber 44 and the carriage lid 65 is closed.

While the cartridge 45 is housed within the carriage chamber 44, the cartridge 45 is attached to the needle arm lifter 47.
covered over the top. As shown in FIG. 9, support member 64 extends into cartridge 45 through aperture 69 and engages connection plate 54 at its rear end.

When the arm stretcher 46 moves forward, the support member 64 aligns with the engagement surface with the support section from the initial necked position (e.g., 8o as shown in FIG. 8) of the connection plate 54. position (for example, cartridge 4 as shown in FIG.
5) perpendicular to the bottom surface. The elastic strips 57 and 58 ensure that the connecting plate 54 takes up this new straightness precisely. The connecting plate 54 is made of a magnetic material.

Support member 64 is also made of magnetizable material.
Support member 64 has walls forming a recess 70 as shown in FIG. The permanent magnet 71 is in this recess 70
It is centered and embedded inside. This permanent magnet 71
Fixing the connecting plate 54 to the supporting member 64 by the magnetic force of
As a result, while the support member and the connection plate are engaged, the periodic movement of the support member can be reliably transmitted to the connection plate. The distance between the permanent magnet 71 and the connecting plate 54 is greater than the distance between the permanent magnet and the wall of the support member 64. Therefore, the largest magnetic field is formed in the annular cavity. The magnetic field within the annular cavity allows any stray magnetic particles in the vicinity of the interface between connecting plate 54 and support member 64 to be attracted away from the vicinity of said interface. This makes the connection between the support member 64 and the connection plate 54 more reliable. As the carriage lid 65 is further closed, the lever 72 depresses the free end 62 of the cantilever 63 as shown in FIG.

This causes leaf spring 61 to place needle arm 51 onto control punch 73 of needle arm lifter 47. One end of the leaf spring 61 fixed to the cantilever 63 comes into contact with a connecting rivet 74 provided on the resonant circuit board 75, and a conductive path passing through the leaf spring 61 is established between the needle electrode and the signal processing circuit. It is formed. When the carriage lid 65 is closed, a spring 76 attached to the lid pushes the arm stretcher 46 down into the carriage chamber 44, placing the arm stretcher 46 in the correct position as shown in FIG. do.

1, the spring 77 fixed in the carriage chamber 44 presses the arm stretcher 46 toward the side wall of the carriage chamber 44, thereby correcting the lateral position of the arm stretcher 46. It is set. The engagement of lever 72 with cartridge 45 allows the cartridge to remain in proper alignment within chamber 44 of the carriage.

The arm stretcher 46 has a protrusion 78 as shown in FIG. 1 so that the rear end of the cartridge 45 can be laterally aligned with the arm stretcher 46, and the core protrusion 78 is aligned with the arm stretcher and the cartridge 45. During their mutual movement, they fit into a recess 79 provided at the rear end of the cartridge 45. Furthermore, to ensure accurate lateral alignment of the front end of the cartridge 45 and the contact rivet 74, the cartridge has a hole in its front end that allows the resonator to be inserted into the resonator during relative movement between the cartridge and the carriage 34. The fuselage portion provided on the circuit board 75 is iron-fitted to the hole. When the hinged plates 40 are closed, the plates 40
One protrusion 82 is provided in the village 7 of the needle arm lifter 47.
3 is pressed down.

A hole 84 is formed in the top of the cartridge 45 through which a plunger 83 can pass, as shown in FIG. When the carriage 34 is in the rest position 38 under the plate 80 and away from the record, the plunger 83 depresses the needle arm lifter 73 and the needle rests on the needle brush 85, as shown in FIG. be done.

Further, when the carriage 34 moves from the rest position away from the record to the playback position on the chord record, the pressing down action of the plunger 83 by the protrusion 82 is released, and the needle arm lifter 73 lifts the needle arm 51. Also, when the carriage 34 reaches the playback position on the record,
The needle arm lifter 47 is energized to move the needle 55 onto the record 31. Regarding the needle arm lifter and needle arm lowering mechanism, there is a patent application filed in the United States on March 16, 1973 entitled "Needle arm lifting/lowering device for video disc playback device↓ Application No. 66730y, inventor Bleazey. and Leeddom
detailed in the specification.

When the needle 55 rests on the needle brush 85 or the record 31, the frayable member 53 will not bend or be subjected to pressure.

This prevents the flexible member from being permanently warped while the cartridge 45 is housed within the chamber 44 of the carriage. Therefore, while the cartridge is outside the carriage chamber, and while the cartridge is housed in the carriage chamber and the carriage is in the rest position away from the record or in the playback position on the record, the above-mentioned The sexual member is in an unpressured state. As shown in FIG. 10, the flexible member is located between the resting position of the carriage 34 away from the record disc and the playback position on the code disc.
Pressure is only applied when the stylus arm is lifted and the stylus passes over the outer bead of the phonograph, or over the periphery of the phonorecord. This period is very short, and there is no need to worry about any noticeable warping occurring in the flexible area. The needle arm and
It provides a passage for wiring between the lifter 47 and the wiring channel 48.

The cartridge 45 has a protective inner wall located close to the needle arm unit 5 to prevent undesired forces from being applied to said unit 50. Since the end of the cartridge 45 is formed into a hook shape and the entire upper surface is covered with a cover, this cartridge 45 has a chamber 44 for the needle weight.
It cannot be inserted backwards or upside down.

[Brief explanation of the drawing]

FIG. 1 is a top view of a portion of a video disc player embodying the invention. 2 is a perspective view of the needle arm contained within the cartridge of FIG. 1; FIG. 3 is a perspective view of the apparatus used to support the needle arm unit of FIG. 2 within the cartridge of FIG. 1; FIG. 4 is a view showing a support member installed in the cartridge of the video disc player of FIG. 1 for engaging the saddle twill plate of the needle arm unit of FIGS. 2 and 3; FIG. be. 5a and 5b show a device for moving an arm stretcher device disposed within the cartridge to effectuate the engagement of the support member of FIG. 4 with the connecting plate of FIGS. 2 and 3; FIG. It is a figure which shows two Examples of. FIG. 6 shows a locked escape device for moving the needle resting in the groove from the locked groove of the chopper cord. 7 to 12 show a series of operations for driving the cartridge into the carriage of the video disc playback device of FIG. 1 and further implementations for moving the arm stretcher device disposed within the carriage. It is a figure which shows an example. 3
4... Carriage, 44... Room, 4
5... Cartridge, 46... Arm stretcher, 51... Needle arm, 54... Connection plate, 55... Needle, 57, 58... elastic band,
64...Support member, 67...Cam, 7
0...Recess, 71...Permanent magnet. Figure 1 Figure 2 Figure 3 Figure 4 Figure 54 Figure 5b Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12

Claims (1)

[Claims] 1 a carriage mounted and chambered for lateral movement with respect to the substrate in relation to the lateral movement of the needle resting on the track during a playback operation; a needle arm holding said needle at one end; a support member disposed within the carriage, and reproduces a signal prerecorded on a record from a record having a spiral track placed on a turntable rotatably provided with respect to the substrate. A needle arm coupling device used in a device for:
a first coupling element fixed to the other end of the needle arm;
a cartridge configured to be received in the chamber and having a wall forming a protective enclosure for the needle and needle arm; means for resiliently suspending within a cartridge, means for positioning the first coupling element in a relationship such that it is aligned with the support member when the cartridge is received within the chamber; means movably disposed within the cartridge for imparting a reciprocating motion to the support member during a playback operation so as to cancel the deviation of the relative speed between the needle and the record from a predetermined speed; said reciprocating movement with respect to said cartridge such that said support member and said first coupling element can be releasably coupled while in the chamber and in such a manner that said reciprocating movement can be precisely transmitted from said support member to said needle; and means for moving the application means.