DE1037165B - Magnetic head holder for magnetic sound recording and reproducing devices - Google Patents

Description

The invention relates to a magnetic head holder

for magnetic sound recording and sound reflectors

Giving devices in the form of a swivel arm around a

Sleeve is rotatable, which sits with the magnetic head through which the photocell 10 passes when the picture is bound carries electrical contacts and is used in a projector with photographic sound tracks correct angular position on a precisely determined 5 is the clay roller, over which the one with a clay path ter position attached to the tape roll fixed axis provided film 6 runs so that it is with a large which is characterized in that the part of its periphery is in contact. :

Contacts of the sleeve to the working circuit via For scanning, recording and erasing the traces

Cable connected contacts in such an arrangement 30 ren on the film serve two magnetic heads, namely correspond that they head 8 easily with them when sliding the sleeve carrying the erase head 7 and the recording and scanning swivel arm. These are attached to removable supports System come and thereby the magnetic head connected to them to the working circuit
Connect cables.

The drawing shows an embodiment of the device according to the invention, in which two magnetic heads be carried by swivel arms that

Easily exchangeable stored on a base plate

brought that sit at the ends of swivel arms 9.11. The magnetic heads are placed on the film at such points a and b that, if necessary, they allow the passage of the scanning light beam from the light source to the photocell 10 protruding through the opening 4 between them. The arms 9 and 11, which preferably consist of an insulating molding compound

which are attached to a guide image projector 40 have a U-shaped cross-section and are in the vicinity, which is already provided with an optical scanning device of the magnetic heads 7, 8 with passages for electrical, which is maintained so that optionally cables 20 or 20 ⁷ provided.

Magnetically and photoelectrically operated. Each arm 9, 11 is by means of a hub 12 and 13, respectively

can. on a fixed equiaxed sleeve 14 or

Fig. 1 is a side view of the for recording, 45 15 rotatably mounted.

Scanning or erasing magnetic tracks are used which are the same in the example shown

the parts; and with one each to its cylindrical outer surface

Fig. 2 is a cross section through the axes of the coaxial bore 16 and 17 provided sleeves Swivel arms carrying magnetic heads, which sit in the interest 14,15 on the base plate 1 perpendicular the clarity of the representation opposite in the 5 ° fixed axes 18 and 19, respectively.

Drawing plane are drawn folded over. For easy application of the knurled button

A base plate 1 is fastened to the nuts 23 by screws 2, which are used to fasten the sleeves 14 or

The axes 18, 19 at the ends 21 are attached to the wall 3 of the projector, which is used in the 15 A circular opening 4 is tapered and provided with thread 22 only behind it.

809 596/275

Each axis 18, 19 has a longitudinal groove 24 in which a pin 25 fastened to the sleeve 14 or 15 in Can slide lengthways.

. Each sleeve 14,15 carries on the side of the base plate 1 a collar 26 at a certain distance, from its end abutting an insulating washer 27. The insulating washers 27 surround the feet of the axles 18 and 19 and carry resilient contacts 28, 29 and 31, 32, which are connected by cables 30 and 30 'to a junction box 33 are connected.

The collars 26 carry contacts 34, 35 and 36, 37 which are isolated from one another and which are connected by conductors 20 and 20 ' are connected to the magnetic heads 7 and 8, respectively.

The contacts 34, 35, 36, 37 are against the resilient Contacts 28, 29, 31, 32 pressed when the sleeves 14,15 are in place and be pushed against the insulating washers 27 by the knurled button nuts 23.

The hubs 12, 13 of the swivel arms 9, 11 carrying the magnetic heads 7, 8 each have one on the sleeve 14 and 15 rotatable axial cylindrical part 38, which in the axial direction between the collar 26 and a ring 39 attached to the outside on a bearing surface 41 of the sleeve 14 or 15 is retained.

The rings 39 are fastened by adjusting screws 42 on the sleeves 14, 15, so that they are just as little how these can turn.

The knurled button nuts 23 are freely rotatable in the rings 39, but immovable through each guided a cylindrical approach which is provided with an annular groove 43, in the loose one in the ring 39 screwed pin 44 holds.

In an axial cylindrical bore of each ring 39 is a hub part 38 surrounding Housed helical spring 45, the ends of which are bent parallel to the axis in axially parallel bores 46 and 47 of the axial cylindrical part 38 and the ring 39 engage.

The coil springs 45 pivot the pivot arms 9, 11 on their fixed sleeves 14, 15 and press the magnetic heads 7, 8 with constant pressure on the film 6 running over the sound roll 5.

The pivot arms 9 and 11 are on the axial cylindrical parts -38 of the hubs in the axial direction thereof offset from one another in such a way that they lie in different pivot planes and are in the Fig. 1 visible way can cross. However, the pivot arm 9 is bent at the free end so that the axes of the magnetic heads 7, 8 lie in the same plane perpendicular to the axis of the tape roll 5 to record, scan, or erase the same tracks on film.

The hubs 12,13 of the pivot arms 9 and 11 are provided with lugs 48 and 49 (Fig. 1), between which a cam 51 is adjustable. This cam can be manually operated by means of a in Fig. 1 indicated by dashed lines toggle 52 are rotated. The cam axis passes through a bearing, the Z. B. is attached to a housing 53 forming cover, which with the base plate 1 and the housing wall3 is connected by screws that pass through bores 54 of the base plate 1 in the housing wall 3 are screwed in.

In the drawn, the record! The erase head 7 and the scanning head are in a corresponding position 8 by the action of the coil springs 45 on their swivel arms 9, 11 against the sound roller 5 running film 6 pressed.

When the cam 51 is rotated 90 ° to the right, its action aruf the approach 49 of The erase head 7 is lifted from the film 6, while the scanning head 8 remains in the scanning position.

If you turn it further clockwise by 90 °, the cam 51 also comes into engagement with the projection 48, as a result of which also the scanning head 8 is lifted from the film 6, so that the optical scanning by the photocell 10 can be done.

In a manner known per se, when the cam 51 is rotated, it is also possible to act on devices, which interrupt or establish the corresponding electrical connections.

Claims (12)

Patent claims: 1. Magnetic head holder for magnetic sound recording and sound reproduction devices in the form of a swivel arm which is rotatable around a sleeve, the electrical connected to the magnetic head Contacts carries and in a certain angular position on a precisely defined position to Sound roller fixed axis can be attached, characterized in that the contacts (34, 35 or 36, 37) of the sleeve (14 or 15) connected to the working circuit via cables (30 or 30 ') Contacts (28, 29 and 31, 32) correspond in such an arrangement that they are when pushed the sleeve (14 or 15) carrying the swivel arm (9 or 11) easily with them come to the plant and thereby the associated magnetic head (7 or 8) to the working circuit Connect using the cables (30 or 30 '). 2. Magnetic head holder according to claim 1, characterized in that the sleeve (14 or 15) receiving fixed axis (18 or 19) is parallel to the axis of the clay roller (5). 3. Magnetic head holder according to claim 2, characterized in that the fixed axes (18 or 19) of the swivel arms at the free end a thread (22) and a tapered end (21) and a button nut (23) for tightening the sleeve (14 or 15) receives and that the axis is provided with a longitudinal groove (24) into which a carried by the sleeve Pin (25) engages. 4. Magnetic head holder according to claim 2 and 3, characterized in that the sleeve (14 or 15) is provided with a collar (26) in the vicinity of its foot, in which it is isolated from one another by Contacts (34) connected through the swivel arm (9 or 11) to the magnetic head (7 or 8), 35, 36, 37) are attached, which protrude after the end of the axis carrying the sleeve (18 or 19) and with resilient ones connected to the working circuit via the cables (30 or 30 ') Contacts (28, 29, 31,32) come into contact. 5. Magnetic head holder according to one of claims 1 to 4, characterized in that the Swivel arm (9 or 11) rotatable on the sleeve (14 or 15), but on it in the longitudinal direction is fixed by a ring (39) firmly connected to the sleeve. 6. Magnetic head holder according to one of claims 1 to 5, characterized in that each a helical spring (45) is arranged between the sleeve (14 or 15) and the swivel arm (9 or 11) is that the magnetic head (7 or 8) with constant pressure against the over the sound roller (5) presses the sound carrier (6). 7. Magnetic head holder according to claim 3 and 5, characterized in that the button nut (23) is held in the longitudinal direction by the ring (39), but is freely rotatable in this. 8. Magnetic head holder according to claim 1 to 3, characterized in that two axes (18,19) are attached to the same base plate (1) and receive two magnetic heads (7, 8), one of which one (8) for scanning or recording and the other (7) for erasing the tracks is determined. 9. Magnetic head holder according to claim 8, characterized in that the magnetic heads {7, 8) from the sound roll (5) at points offset in the circumferential direction so that optical sound paths between them can be scanned by the photocell (10) which may be present. 10. Magnetic head holder according to claim 9, characterized in that the pivot arms (9, 11) are provided with lugs (48 or 49), which are connected to one of the base plate (1), to be moved by hand cam (51) can come into contact, by actuating the Magnetic heads (7 or 8) carried by the swivel arms separately or simultaneously from the track can be withdrawn. 11. Magnetic head holder according to claim 9, characterized in that the cam (51) in a housing with a cover (53) is mounted, which the base plate (1) and that carried by it new parts completely or partially covered. 12. Magnetic head holder according to one of claims 1 to 11, characterized in that at a projector provided with an optical scanning device, the base plate (1) with a Opening (4) is provided, which allows the light to pass through to the photocell (10), and on the projector is fastened by screws, which are part of the intended for fastening the ordinary housing Use threaded holes. Considered publications:
German patent specifications No. 853 210, 699 451. 1 sheet of drawings I «09 598/275 β.