DE1943643U - SWITCHING DEVICE FOR RECORD DEVICES. - Google Patents

Description

? 050 * 22 ./,. 66

Dipl.-Ing. Egon Prince Dr. Gertrud Hauser ⁸⁰⁰⁰ Munich-Pasing, £ 1, April

. I. ^ * .... ι]. Ernsbergerstrasse 19

ipl.-lng. Gottfried Leiser

Patent attorneys

Telegrams: Labyrinth Munich

Telephone: 83 15 10 Postal checking account: Munich 117078

GARRARD ENGINEERING LIMITED

Newcastle Street, Swindon, Wiltshire, England

Our sign; G 995

Switching device for record devices

The invention relates to an improved switching device for record devices, which after playing
a record comes into operation, for example to switch off the motor of the record device and /
or initiate a so-called cycle of operation to lift the cartridge off the platter and other operations that may be desired in connection therewith, such as returning the cartridge arm to a
Edition or the initiation of a plate change cycle or the like. Usually, one makes use of the fact that the switching device is actuated
the run-out groove into which the needle enters after playing
occurs, is much more curved than this at

From / Sr

the greatest curvature used for clearance grooves is the case. One therefore sees for the above Purpose of a shift control member, generally a lever, which by frictional force at least against the The end of the record is coupled with the inward movement of the tape head arm and, as soon as its resulting movement goes beyond a certain position, comes into engagement with an abutment, that rotates around the turntable axis at a speed proportional to the speed of the turntable The mutual interaction of the abutment and the switching control element is used to trigger the desired Operation is used while means are provided which, when such interaction is over a fixed path of rotation, generally approximately one full turn of the plate, is not established will return the switching control member to a position in which its distance from the path of the abutment is greater than its advance, which is maximum during such a section of revolution through a groove Curvature is generated.

The aim of the invention is to provide a switching device of the type described in which

the

the periodic return movement of the switching control member is effected without physical contact. According to the invention the backward movement of the first control member by a Magnetic circuit, whose line of force field is an element that takes part in the rotation of the counter bearing and another element that interacts with the switching control element moves, includes, so that the magnetic circuit is periodically effective, whereby the switching control member is moved away by the desired distance, which the interaction with the rotating counter bearing for the purpose the circuit manufactures. For the present purpose, the magnetic repulsive force is preferably used, For this purpose, preferably two permanent magnets are used, one of which is from the switching control element while the other rotates with the counter bearing to during each revolution of the turntable to become effective once, if the switching control element does not previously trigger interaction in the circuit came with the rotating counter bearing.

The features of the invention can be incorporated into the automatic switching device of British patent Ήν. 673 * 852 are inserted and replace the mechanical reset device for the shift control element, she read

sen

but can also "be used in a construction that in British patent application Ir. 24738/63 is, i.e. a record player that does not have an automatic record changer »

The invention is described in the drawing using an exemplary embodiment. In the drawing are;

ig. 1 is a plan view of the switching device without Turntable,

Pig. 2 shows a partial section along the line 2-2 of Pig. 1, and Pig. 3 is a partial section along the line 3-3 of Pig. 1.

From the drawing it can be seen that when the needle of a record player equipped with the switching device towards the end of the playing of a disc moves towards the center of the disc, a circuit controlling the Member, which is represented by a lever 1, is moved inwards by a Priktionsscheibe 2. This Priktionsscheibe is preferably by means of a pin 3 with the pickup arm 19 of the turntable

through

coupled through a backlash device, so that any Inhibits the inward movement of the pickup arm

Ί is prevented until the last few play grooves in the

Record are reached. The lever 1 actuating the gearshift is connected to a pivot 10 so that that it not only moves freely around the pivot 10 in a horizontal plane, but also its opposite End 1A can lift out of its normal plane, whereby an arm 17 of a switching device 18 is raised, which is pivotable in the fixed part of the turntable or changer is arranged. This upward movement of the arm 17 is used to initiate the next cycle of record changes, pause the record player, or any other desired To begin operation «, normally the lever 1 is held in its normal horizontal position, in which it is coupled at the same time with the friction disc 2 by a friction buffer 12, which from the The underside of the lever 1 protrudes so that the lever 1 is supported on the friction buffer 2. The lifting of the lever 1 at the end of the turntable is effected by a face cam 14, which is on a part 15 is located by the axis of rotation assembly 7 of the turntable protrudes. The face cam works together with a ramp surface 13 on a bracket 4,

the

which is riveted to the underside of the lever 1.

About the movement of the lever 1 against the axis of the turntable rotation axis structure 7 in a sufficient way to prevent it only then with the face cam 14 comes into contact when the stylus reaches the strongly curved run-out groove of the record has, a small permanent magnet 5 is clamped to the arm 1 by the bracket 4 5 and a second permanent magnet 6 is similarly attached to the pivot assembly 7 by a bracket 8. The order of the two magnets 5 and 6 is such that their axes lie in a common horizontal plane, and that if during the rotation of the turntable the Magnet 6 assumes the position shown in Fig. 1, the same poles of the two magnets 5 and 6 are opposite one another. In this way, a repulsive force is generated, the lever 1 from the axis of the turntable so moved far away until the opposite pole faces of magnets 5 and 6 are further apart, corresponds to the largest possible amount of the approach movement of the lever 1, which is caused by the advancement of the Pickup arm is generated when this one complete revolution of a record groove of maximum curvature passes through. However, if the wand hits the outlet ril

le of the plate, the curvature of which is a multiple of the maximum curvature of the plate groove, approaches the lever 1 moves sufficiently far during a single rotation of the turntable of the axis of rotation 7, whereby the ramp surface 13 with the face cam 14 is brought into contact on the part 15, as can best be seen from Pig »1, the part around the axis of the axis of rotation 7, relative to the magnet in such a direction that the Plank cam meets the ramp 13 and in this way lifts the lever 1 and causes the switching device 18 to be actuated by its arm 17 before the magnet 6 meets the magnet 5 of the arm.

The axis of rotation structure is preferably also equipped with a driving cam 16 which is positioned above the magnet 5 is arranged and, after the switching device has been operated, the lever 1 in the horizontal direction pushes back and brings out of contact with the face cam 14, whereby an unnecessary repetition Raising and lowering the shift lever 1 is avoided.

the

The switching device 18 has only been described symbolically, it will be readily understood that they can take a variety of conventional or convenient forms, including that in the aforementioned Ir. 673j852 described may own. You will also see that, if desired, the actual switching process can be carried out without the Shift actuator is raised, as shown, for example, in British patent application Wr » 24738/63 is described.

Protection claims

Claims (3)

New protection claims 1. Switching device for record devices, characterized by a switching control member and a rotating Counter-bearing that interacts with this, with the return movement during playback of the disk the switching control element is caused by a magnetic circuit, the force line field of which encloses an element, that takes part in the rotation of the counter bearing, and another element that interacts with the Shift control member moved so that the magnetic circuit is periodically effective to the switch control member to move the desired distance out of the position that interacts with the triggering circuit the rotating counter bearing causes. 2. Switching device for record devices according to claim 1, characterized in that the element (6). St. - 2 - that takes part in the rotation, and the element (5) that moves with the shift control member (1) such are arranged that like poles are opposite so that they move during their mutual movement generate a magnetic repulsive force. 3. Switching device for record devices according to claim 1, characterized in that two permanent magnets are used, of which one of the Shift control member is carried while the other rotates with the counter bearing, causing them once during every rotation of the turntable take effect if the switching control element is not previously in the Circuit-triggering mutual effect with the rotating counter bearing has come. vi «#» Ut Ditae Untertoge (8escfe # ell5unq um} Schutzonspr.) is dte rent »submitted; It deviates from the Wm joss «™ der ursortngBch emgsretcl ^ n Üniertoger whether. The legal B * Ieu'un _{e of} the deviation has not been checked The official authority can still be viewed without the need for a revenge. On request, photocopiers, oco r can also be delivered at the Dbfchen price. Deutsoh «Pomnmmt. GÄhÄiwtel