DE1008926B - Automatic needle insertion device for record players or record changers with controlled tone arm movement - Google Patents

Description

GERMAN

The invention relates to turntables or record changers with controlled tonearm movement and automatic adjustment of the needle engagement to the respective plate size. To make this a reality Adaptation, it is known to set the tone arm within the inlet groove on the disc to be played and then to pivot outwards, wherein the tonearm is equipped with a pivotable guide member, which during the outward pivoting prevents the trailing needle from engaging in the plate groove and prevents this engagement only when the plate edge is exceeded.

With such a design of the device, it is of course necessary that the guide member during the outward pivoting and scanning movement of the tonearm held in such a position is that the needle moves above the disc groove and above it during the playback process to hold the plane in which the stylus 1> e is found. These requirements are well known Suggestions have been taken into account. But this was done in a way that was too mechanical difficult constructions and thus complications with regard to reliable operation leads.

It has also already been proposed that the Fübrungsorgan in a holder with two locking points to use and to load with a spring, which the locking of the guide member in the two Causes end positions. The guide element is not attached in a pivotable manner, but in Slidable in the direction of its axis, so that the two locking points are axially offset from one another. The overpass of the guide member from the engagement-preventing position to the position that the needle insert causes an axial displacement of the guide member is required. The one needed for this Force must be exerted by the needle engaged with the record, which is insufficient is reliable and can therefore lead to damage to the grooved field.

The arrangement according to the invention aims to eliminate this drawback. She goes from a hinge arranged guide member, which is held in its two end positions by a latch, and realizes one that is mechanically simpler and more reliable than the known arrangements Control of the tonearm movement by the fact that the guide member has an outward pivoting direction of the tonearm's trailing button, which, as soon as the guide element crosses the edge of the record, the stylus will only sink with its pivoting forced by the rotating plate lets and thereby the governing body from the

Automatic needle insertion device

for turntables or record changers

with controlled tonearm movement

Applicant:
Emil Knecht, St. Georgen (Black and White)

Emil Knecht, St. Georgen (Black and White),
has been named as the inventor

Working position promoted to the rest position, and has an actuator which has its return from this rest position to the working position before the next lowering of the tonearm.

It has proven to be useful to dimension the button so that it can see during the outward pivoting of the tonearm moved above the record. In this way, during the outward pivoting the tonearm avoids dragging the button on the record.

The guide member according to the invention offers thanks

its latching in the working position the possibility of this latching in the dead center position or from to realize the dead center position of the guide member without the risk of jerky Set-up of the tonearm an unwanted removal of the guide organ from its operating position can be done. The locking of the guide member is in or before the dead center position therefore advantageous because during the pivoting of the guide member from the working position into the Evasion position only takes place a circular arc-shaped movement, during which all Move parts of the guide organ steadily upwards. It can therefore not happen that the management

- organ gives the tonearm an acceleration in a vertical upward direction, which could lead to the tonearm makes a jump movement and the needle touches down incorrectly and too hard.

The above-mentioned device, which the management organ before the next lowering of the Tofi arm readjusts for scanning can be very diverse. For example, you can use the Movement of the tonearm head against the center axis of the turntable or against part of the tonearm rest for the repatriation of the executive organ in

709 510/505

take advantage of its locking position. For the same purpose one can use the shutdown mechanism of the device or the swivel mechanism of the tonearm. For devices that are not controlled Have tonearm movement, you can return the guide member to its locking position also through the movable handle of the tonearm.

There are several options available for training the management body. You can do that Train guide organ in a manner known per se as a role, which by appropriately inclined setting their axis to the radius of the respective point of contact as För the organ for the outward pivoting of the tonearm. The guide member can also be designed as a slider, namely either as a sliding shoe or as a sliding brush, or as a roller which is oriented so that it does not pivot outwards of the tonearm. In all of these cases, the invention allows the outward movement manage the tonearm by means of a corresponding guide curve of the tonearm control, the coupling between the tonearm and the tonearm control when the guide member is transferred from the working position to the rest position. is lifted.

The object of the invention is illustrated in the drawing in one embodiment; in the Drawing shows

Fig. 1 is a side view of the tonearm head with the guide device,

Fig. 2 is an end view of the tonearm head. On the tonearm head is just before the Carrying the alternately usable needles 1, a sliding shoe 2 is attached, which is attached to a lever 3 is attached. The lever 3 is pivotably arranged at 4 in the tonearm head. The pivot axis 4 is as Square formed, on which a spring 5 rests, which forms a locking with the square threads. In the position shown, the sliding shoe 2 is in its working position, i. i.e., it serves as the carrier of the Tonearm by resting on disk 6. In this position, the shoe 2 and its lever 3 is by means the latch 4, 5 secured. The lever 3 carries one Button 7, which is located above the plate 6 during the setting of the sliding shoe 2 according to FIGS. 1 and 2, but 3η slightly smaller distance from the plate than that Needle 1. The button 7 is used to cancel the locking of the slide shoe 2 in the illustrated Working position, namely this cancellation of the locking takes place as soon as the tonearm swings outwards has executed in the direction of arrow 8, in which the sliding shoe 2 exceeds the edge of the disk 6 and the tonearm head moves downwards can perform. The button 7 strikes against the top of the plate 6 so that it is removed from the rotating plate is entrained by friction and the resulting pivoting movement Lever 2 pivoted. This pivoting of the lever 2 takes place through 90 ° and leads to the next one Latched position in which the spring 5 interacts with the adjoining surface of the square 4. During this pivoting of the lever 2, the latching spring 5 has an accelerating effect. In the now existing latched rest position of the lever 3, the sliding shoe 2 takes a position above the disk 6, so that the playback process now beginning, in which the tonearm is moving executes in the direction of arrow 9, is not hindered by the sliding shoe 2.

After the playback process and before the start of a new placement of the tonearm on the next one to be played Plate, the shoe 2 must be returned to the locked position shown. This return is effected by means of a lever attachment 10 on the lever 3. The leverage approach 10 is designed for this purpose so that it has a stop on the turntable shaft or on the armrest hits. But it is also possible to return the sliding shoe 2 to the working position Use the machine's parking mechanism or the tonearm movement control mechanism.

With simple turntables that do not have a mechanical tonearm control, the return of the Glide shoe 2 in the working position also take place with the help of the tonearm handle 11, which in this Case is designed as a movable lever of some kind.

In the illustration shown, it is assumed that the outward movement of the tonearm is caused by a corresponding Guide curve of the tonearm control is accomplished before the playback process begins. Care must be taken to ensure that the coupling between the tonearm and the tonearm control the machine is caught up as soon as the sliding shoe 2 is transferred from the working position to the rest position will. The sliding shoe 2 can be designed as a rigid member or as a grinding brush. It is also possible to attach a roller to the lever 3 instead of the sliding glove 2. If this role is so aligned is that its axis is inclined to the radius of the respective point of contact, so the role is in a known way when placing the tonearm on a rotating plate arrange for the tonearm to be transported outwards. The outward movement of the inside the inlet groove of the In this case, the tonearm to be played may not, of course, be activated by the tonearm control the machine.

Claims (5)

Claim ε-1. Automatic needle insertion device for turntables or record changers with controlled tonearm movement and automatic adjustment of the needle engagement to the respective record size, in which the tonearm has a guide element held in its limit positions by resilient latching, which prevents the stylus from lowering during the outward pivoting of the tonearm Intervention only when the record edge is exceeded, characterized in that the pivotable guide member {2, 4) carries a trailing button (7) in the sense of the outward pivoting of the tonearm, which, as soon as the guide member exceeds the record edge, the stylus with the help of its through the revolving plate can drop forced pivoting while the guide member is promoted from the working position to the rest position, and an actuator (10), which bewi the return from this rest to the working position before the next dropping of the tonearm rkt. 2. Apparatus according to claim 1, characterized in that the button (7) is arranged so that it moves during the outward pivoting of the tonearm above the plate (6). 3. Apparatus according to claim 1 or 2, characterized in that the guide member {2, 4) is in its dead center position or in front of its dead center position when it assumes its working position. 4. Apparatus naeh one of claims 1 to 3, characterized in that the return of the guide member (2, 4) in its working position mediating actuator (10) for the interaction with the turntable wheel or part of the tonearm rest or with the pivoting mechanism of the tonearm or with the shutdown of the device is set up. 5. Apparatus according to any one of claims 1 to 3, characterized in that the actuating member (10) which mediates the return of the guide member {2, 4) into its working position is connected to your movable control handle of the tonearm. Considered publications:
Swiss Patent No. 289 751;
French patent specification No. 882 426. 1 sheet of drawings © 709 5KV205 5.