DE2138649A1 - Magnetic strip cassette - Google Patents

Description

84 REGENSBURG ZOLLERSTRASSE 13 TELEPHONE (0941) 5 38 02

File number: Regensburg, the «. »Λ *? Λ

Homed. Annw Scovill Manufacturing Co., 99 Mill Street, Waterbury , Connecticut, USA

My reference: S 111

L / Ka

Magnetic strip cassette

The invention relates to drum cartridges for winding of magnetic recording strips "

The known and customary cassettes for winding Magnetauf zeiclmungsstreif en consist of molded plastic Parts that are put together. Guide pins for the Stripes are molded into these parts and where stripes

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guide rollers are used, they are also made of plastic * The guide pins, which are integral with the cassette parts are shaped, do not have an exact cylinder shape, but are bevelled with small sliding angles as a result of the manufacture. This prevents the strip from running in a regular straight path. Because the guide pins and guide rollers are not made In addition, static charges which form on the recording strip cannot be avoided are and often generate higher internal friction, imprecise winding packages in the cassette and undesirable noises in the pickup of the playback device. The invention has set itself the task of the previous structural design of the usual drum cartridges to avoid·

The invention solves the problem in that a housing with a lower and an upper shell made of such a material it is provided that electrical charging of the housing and the cassette is prevented. In particular, there is the housing made of metal. The new structural design according to the invention has, in addition to higher strength, a few more remarkable ones Advantages.

The metal cassette according to the invention is heat-resistant and Moisture-repellent, dimensionally stable and independent of the outside Environmental conditions. The guide pins for the magnetic strips are exactly cylindrical and fitted at right angles to the cassette by pressing and are exactly parallel to the surface of the sound

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atoehmerkopfes · to the strip on exactly straight Balin lead to ■■ This is important because the strips usually have two soundtracks and should not dodge sideways, otherwise the pick-up head would not be right. The strip runs τοη the full spool over the guide rollers and guide pins and · the pickup head to the winding spool. The flat cassette works similarly in the opposite direction. In order to reduce the frictional forces on the strip to a minimum, the guide rollers running on ball bearings or similar reibungsaraea Hitteln "Since most of the parts of the cassette of metal bestShSn ₉ are grounded all static charges about emerging and icönnen leave no difficulties arise, such as inner Seibung , incorrect winding in the cassette with the consequence of wear of the strip edges and indeterminable Störnngea on the cartridge head. A new misshapen screen shields the probe head against radiation both from the sides and from the front, since the elastic leaf spring ₉ which carries the soft, flexible strip pressure pad "is held independently of the screen and the support supports of the leaf spring are arranged at a greater distance from one another ₉ by the resilient Dodge Fedsr exerts to allow, when the strip is pressed by the pick-up head against the soft pressure pad * the dimensions of the Druekkissens are enlarged and Au improve the stability of Straifoalaufs by achieving a greater contact with the Tonabaehmerkopf and the strip. The pillow itself "b © - is made of white <3m ₅ flexible fabric ₃ sB" felt or plastic foam and has a surface with little rexbrag "

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Piece of pliable, resilient fabric of suitable thickness used attached to the cassette so that it is in the same place as the pressure pad and leaf spring.

In the following description and claims, the For the sake of simplicity, parts are marked with special hats, but these names should be generally valid in their application also for similar parts according to the state of the art. Same Reference symbols apply to the same parts in the various figures

Pig. _N 1 is a plan view of an inventive Trommelkassetta

Pig. 2 is a front view of the cassette in the direction of arrow 2 the pig. 1,

Pig. 3 is a view of the rear surface of the cassette looking towards FIG of arrow 3 the pig. 1 ,

Pig «4 along a section through the strip guide roller the line 4-4 in Pig. 1,

Pig. 5 is a front view of the press pad and leaf spring of the cassette;

Pig »6 a top view of the In Pig. 5 illustrated compression spring _:

Mg. 7 an enlarged view of one of the elongated guide ends of the compression spring looking at arrow 7 of the pig » 5-,

Pig «8 a top view of the reels of the cassette,

Fig. 9 is a cross-section along Maie 9-9 in Pig. 8 putted plate ₉

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S ¹ Ig. Fig. 10 is a plan view, on an enlarged scale, of the lower part of the cassette shown in Fig. 1,

fig. 11 is a view of the front of the in Pig. 10 illustrated lower part,

. Figure 12 shows another embodiment of the Pig's press pad.

In Pig. 1 shows a plan view of a drum cassette 20 "which has a lower half-shell 21 and an upper half-shell 22. Both are preferably made of metal. They have essentially the same shape and complement one another. Particularly suitable metals are aluminum, stainless steel and the like. The shells 21 and 22 fit exactly into one another and are preferably held together by screws 23 (Pig. 1). Two identical holes 24, 25 (Pig x 10) are made in the lower and upper shells 21, 22 to accommodate the usual cheek plates 26, 27 of the reels 28, 29 of a magnetic recording tape 30. Five "Penster ° openings 31 to 35 are arranged in the end face of the cassette 20, ytle from Pig. The penster 33, which is the central opening, is placed so that the pickup head (not shown in the drawing) of the book game device ( also not shown in the drawing) can be pressed against the magnetic strip 30 (Pig. 11), which is carried in the receiving area by a press pad 36 (Pig. 1, 6, 10, 11). Openings 31, 32 and 34 _S 35 are arranged to the right and left of the central opening 33 for easier insertion of the cassette be knocked out

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can, for example, to prevent friction and wear and tear or to fix the working side of the cassette 20. Guide rims 40, 41 (Pig. 10) are arranged on the side surfaces of the cassette 20 such that mating end halves are formed on the lower and upper shells which conform when assembled. A tape guide roller 42 is arranged on both sides of the cassette 20 in the corners of the front. The guide roller 42 (Pig. 10) forms the outer cage of a low-friction ball bearing _f while an inner inlet 43 », which forms the inner cage for the balls 44, on a socket or pin 45 (Fig. 10, 11). which is part of the lower molded shell 21 is pressed. Guide roller 42 has flaps 62 and 63 to hold the strip on surface 64. Of course, the guide rollers 42 can have any type of low friction bearings. Two strip guide pins 46, 47 are arranged near the guide rollers 42 and two further strip guide pins 48, 49 are arranged on the right side and on the left side of the central opening 33 for guiding the strip across the pressure pad 36 and cartridge head (not shown). The guide pins 46-49 are made of metal, preferably steel, and are straight and cylindrical with no warping or skew in contrast to pins in plastic molded cartridges. The metal construction of the cassette part in which the pins are inserted ₅ allows pins to be inserted exactly at right angles to the path of the strip 30. This construction ensures that the strip runs precisely over the pickup head. Because the pens are made of metal, they dissipate static electricity from the strip, which plastic molded pens do not

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= - 7 -

can. An exactly U-shaped screen 50 is arranged in the area of the head opening 33 to protect the strip 30 against radiation from the rear and from the side, in order to keep any disturbances of the normal pickup activity away from the pickup head. The legs 51, 51 * (Pig "10) of the screen 50 are brought closer to the cartridge, but the leg 51 _s 51 ⁸ ausgeschnitten5 so that the leaf spring blade 52, which the rich and resilient, the strip bearing pressure pad 36 carries allowed to pass and can extend sideways to achieve greater flexibility «The spring blade 52 is supported by pins 54 outside the legs 5], 51 ^s . The spring blade 52 has a precisely elongated shape without lateral bends _{9 in} order to hold it exactly in place. As shown in Fig. 5 ₉ vertical upper and lower extensions 55 '55' are provided with folds 56, 56 ^s (Fig * T) ₅ which fit into the elongated openings 57 in the upper and lower shells 21, 22 for a longitudinal movement " to prevent the blade 52 - but the lateral movement thereof, perpendicular allow the strip 30 "the very small longitudinal movement of the pressure pad 33 facilitates the travel of the strip 30 _β seals in both the structural design of the Federkliag © 52 and the arrangement of the wearer also dampens any vibration * which could cause the action of the spring when the strip is held against the head of the spring blade 52 can be replaced by a pressure pad of greater thickness, for higher pressure _9, which is glued to the screen 50. This pad should be made of soft, resilient materials, itfie ZoB ₀ felt or foam plastics, consist or any combination with a surface that is low in moisture. The low-friction

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2.2.

Cheek plates 53 (FIG. 8) are accommodated in the trays £ #, 21 (Pig. 10) to protect the strip coils 28, 29 by reducing them the friction and also to reduce or discharge static charges during winding or unwinding. The cheek plates 53 may have diagonal folds which form ridges 53 'around the strip 30 during winding and unwinding to lead exactly. Windows 58 in both shell halves 21, 22 and corresponding windows 39 in the cheek plates 53 are provided, in order to optically cover the running strip coils 28, 29

P guards. A particular feature of the cassette is that all working ile T _e, as rollers 42, pins 46, 47, 48, 49,
So that no parts can fall out screen 50 and pressure pad 36 and support spring blade 52 in the lower shell 21 (Fig. 10, 11) are installed, when a reassembly is necessary _r when the cassette is opened to insert a new strip coil. Supplementary wall pieces 60 (Fig. 2) covering the front wall are placed on the upper shell 22 to facilitate threading a strip into the open lower shell during coil assembly.

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Claims (8)

Claims 1. Cassette for magnetic strips with carrier coils for the magnetic " strips, one of which is used to unwind while another spool is used to receive the unwound strip, as well as means for carrying and guiding the strip during the transfer of the strip from one reel to another, characterized in that a housing (20) with a lower and an upper shell (21, 22) made of such a material for the strip (50) it is provided that electrical charging of the housing or the cassette (20) is prevented. 2. Cassette according to claim 1, characterized in that the substance is at least partially electrically conductive. 3. Cassette according to claim 1 and 2, characterized in that the fabric is dimensionally stable, heat-resistant and moisture-repellent is. 4. Cassette according to claims 1 to 3, characterized in that exactly cylindrical, preferably also electrical conductive, rigid, in particular metallic guide pins (46-49) are provided in the housing (20) for guiding the strip (30). 5. Cassette according to claims 1 to 4, characterized in that a resiliently resilient one for supporting the strip (30) Pressure pad (36) is provided. 209809/1463 6. Cassette according to Claims 1 to 5, characterized in that that two pressure pads (36) are provided to support the strip (30). 7. Cassette according to Claims 1 to 6, characterized in that the guide rollers (42) for the strip have low friction have bearings (43, 44). ™ 8. Cassette according to Claims 1 to 7, characterized in that that the strip support device has a leaf spring (52), the ends of pins (48, 49, 54) in the lower Shell (21) are carried and that a soft, resilient pressure pad (36) supporting the strip on the leaf spring (52) is attached. 9. Cassette according to claims 1 to 8, characterized in that the lower and upper shell (21, 22) each have a longitudinal opening (33) and the leaf spring (52) has vertical upper and lower extensions (55, -55 ') with means (56, 56') for Prevention of jamming in the opening, whereby the extensions fit into the openings around the leaf spring (52) to protect longitudinal movements, while a lateral movement perpendicular to the strip is allowed. 10. Cassette according to claims 1 to 9, characterized in that that a U-shaped screen (50, 51, 51 ■) in the lower shell (21) is provided to protect the pickup against radiation and that the ends of the leaf spring (52) extend over 209809 / U63 the correspondingly recessed legs (51, 51 ') of the screen (50) extend. ο Cassette according to claims 1 "to 10, characterized in that that the bobbin cheeks (53) at both ends of the strip bobbins (26, 28, 27, 29) are low-friction and ribs (53 *) for the Have guidance of the strip (30). 12. Cassette according to claims 1 "to 11, characterized in that that the upper shell (22) carries all the front wall parts (60) to allow the insertion of the strip (30) in the lower shell (21) to facilitate. 209809 / U63