DE2242308A1 - DRUM-SHAPED CHARACTER MEMORY - Google Patents

Description

Patent attorneys Dipl.-Ing. F. Weickmann,

Dipl.-Ing. H. Weickmann, D1PL.-PHYS. Dr. K. Fincke , F. A. "Weickmann, Dipl.-Chem. B. Hüber

XPE

8 MUNICH? 6, DEN

BOX 86P 820

MÖHLSTRASSE 22, CALL NUMBER 98 39 21/22

Graphic Systems, Inc.,

217 'Jackson Street,

Lowell, Massachusetts, Y.St.A.

Drum-shaped character memory.

The invention relates to a drum-shaped character memory, especially for photocomposing machines, for the selective display of characters on a Figure location.

In light typesetting machines of the known type, drum-shaped character memories are used in which on a film strip several groups of characters or types of characters in groups one behind the other and are arranged distributed over the circumference of the drum. The drum is spun around the characters to bring one after the other to an optical imaging system that is operated in pulses at a high frequency Light source is illuminated. The respective character is selected in that the light source is switched on when this character is aligned with the imaging system. In this way, a photographic printing plate can be made will.

For light setting and other setting processes, you must

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many fonts for optional use accordingly be available in each case given setting tasks. Photocomposing machines are supposed to be able to set a character from as large a number of character groups as possible with as little time and effort as possible -guarantee.

Many typesetting machines working with storage drums contain several types of characters, one after the other are arranged on the circumference of the storage drum. Such machines however, require a preselection of the combinations of fonts that will then be printed on a filmstrip applied and attached to this on the drum circumference. In a known machine of this type is an alternation of the types of characters by use of separate film strips with different types of characters possible on the drum circumference attached and aligned with alignment pins.

However, such an arrangement for ^{changing the font: T} , eichonarten has several disadvantages. The accuracy with which the types of characters can be arranged and held on the drum is in any case, and especially after prolonged use, unsuitable for meeting the high requirements of the typesetting process. The alignment pins are always subject to considerable manufacturing tolerances, the same applies to the alignment openings provided in the respective film. After a long period of use, the openings increase due to handling and the tension of the film strip caused by rapid rotation of the storage drum. Furthermore, in the known arrangement, the optional replacement of individual types of characters is unnecessarily time-consuming and

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complicated, so that some users have a whole storage drum and not just replace individual film strips. It has also been shown that the flexibility of a filmstrip, bending, warping, or otherwise Distortion at high rotational speeds is possible. This is especially the case when the alignment between the characters and their associated time reference marks is distorted. The time reference marks are usually monitored electro-optically by the machine control in order to identify a number about the characters arranged at the imaging point at a given point in time.

The problem of the exact arrangement of the characters arises the drum is particularly present in machines in which the characters are shown enlarged will.

The object of the invention is to provide an improved character memory that allows replacement of fonts is guaranteed with minimal expenditure of time and effort, as well as compliance predetermined accuracy limits of the character arrangement allowed even at high rotational speeds of the storage drum. This accuracy should in particular Dimensions for the alignment of the Zeithezug brands on the Characters are realized.

A character memory of the type mentioned at the beginning is such according to the invention to achieve this object formed that several, each with a character group provided rigid character carriers with partially cylindrical outer surface strung together the

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Drum! Forming the circumference on a rotatable device are fastened interchangeably.

The advantages that can be achieved with the invention | Further developments of the invention and the structure of exemplary embodiments are described below in the form of figures. Show it:

Pig «1 a perspective and partially drawn illustration of a l according to the invention,

Fig * 2 shows the section of the Φί * §ΙϊΑ§1 segment 20 * shown in Fig. 1

Fig. 3 is a perspective view of another AusfÜhrutigsbeispiels the invention and

Fig. 4 shows the section of the AttfiftÜä shown in Fig. 3: PttiigS for example.

Figs. 1 and 2 show one
which, in the form of a storage drum 10, can possibly be used in a Söhrift mark display device or a recording device such as a photo etching machine. This * · Schriftgeichenspeicher summarizes a hub 12 and a plurality of drum segments Ί4-, 16 _S 18 and 2NC, which are mounted on the hub 12 * ¹ Jr ¹ O stm fei ese gmente 14, 16, 18 and 20 are SchriftzeichentrMger and this, in each case with a character group 22 vepee «hen. Each drum segment is provided with a group of characters, but in the same way several groups of characters or, for example, similar types of characters can be provided on an opening segment *

For the arrangement of the characters on the 5? L »öffl © §lßeg-

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elements 14, 16, 18 and 20 is used in the illustrated here Embodiment a photographic film strip 24, which in addition to the characters 22 a number of time reference marks 26, which are assigned to the characters 22 and the machine control information about which character at which point in time is arranged at an imaging point.

Each drum segment 14, 16, 18 and 20 has a cylindrical part 28, the outer surface 30 of which has the characters 22 wears. Furthermore, a radial web 32 is on the cylindrical Part 28 attached. It can be seen - that the Characters on a cylinder moved xverden, the through 'the respective outer surface 30 of the cylindrical Parts 28 of the drum segments is formed. Every character is contrasted in this way with an imaging system (not shown), namely under constant radial distance to the drum axis and thus constant axial position in Imaging system.

In order to create space within the storage drum for a light source to illuminate the characters, ' the web 32 of each drum segment is connected asymmetrically to the cylindrical parts 28. It has has shown that this asymmetry causes distortion of the drum 10 at high rotational speeds. To the Counterweights 34- and 35 on the shorter one are used to compensate for this Side of the cylindrical part 28 is provided.

An important feature of the invention is that a character memory is provided in which the characters with high accuracy at predetermined

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Places are arranged. The problem of the exact arrangement of the characters in the character memory arises from several requirements. The characters must be arranged exactly along the drum axis, i.e. relative to any reference plane normal to the drum axis. In the illustrated embodiment, in which the characters are arranged one behind the other and not next to one another, each results Error in the axial position of a character in a misalignment of this character on the photographic printing plate (not shown) in the direction of a printing line.

Another source of error is the timing of the arrangement of a character at the imaging point, for example by the pulse control of a Light source. An error in the timing of a character display results in a Misalignment of a character on the printing plate with regard to the height in a print line. During the time control of the characters display essentially a function of the accuracy of the electro-optical monitoring system is that the time reference marks 26 scans and counts, it is also important to align the timing marks 26 with the characters 22 of a drum segment is retained. Any major distortion of this alignment, for example caused by centrifugal forces in a loosely held film strip at high angular speeds v / ground will result in timing errors. In a character store according to the invention, however ensures stability of the character position and the associated time reference marks, so that these Mistakes are avoided.

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To ensure that the characters are exactly in the axial direction are aligned in a predetermined position, a film strip 24 is in a further embodiment of the inventive concept init of a character group 22 and associated time reference marks 26 very precisely on the outer surface 30 of the cylindrical leils 28 of a gedeh drum segment 14 * 16, / 18, 20, including adhesive 36, for example may be applied to the back of the filmstrip 24. However, this is only possible in areas that do not have any Character 22 and time reference marks 26 included. Commercially available double-sided adhesive tape can be used for this.

The drum-shaped character memory consists of several separate character carriers that (each wear a font style. If a photocomposition machine works with this character memory, the types of characters are written on a rotary cylinder assess, whereby the character carriers are arranged rigidly at least within the rotary cylinder * A character memory according to the invention can also be realized in such a way that a rigid base for a font group is provided, for example, it may be in the form of a transparent and flat Plate that have been bent into a cylinder shape and attached to one Frame, a hat or other holding device is attached. Such a plate-shaped strip can bent into a cylindrical shape, it should be butted extremely rigid inside its rotary cylinder arrangement, so that any distortion of the synchronization of the characters 22 with the associated time reference marks 26 is prevented during rotation. A söl ^ rather rigid character carrier holds the problem of

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Wear and the associated loss of accuracy the arrangement of characters is minimal, and the previously required film strip arrangements are no longer necessary *

So that the characters are in their exact order a rigid support are arranged very precisely on the drum axis, the drum segments 14, 16, 18 and 20 is provided with a precisely formed fastening surface 37 which, in FIG. 2, represents the lower surface of the web 32. The precisely machined, cast or otherwise manufactured fastening surface 38 of the hub 12 rests on this surface elements, which in the illustrated Ausfühfuhgsbeispiel two spring loaded screws 4-0 and 4-Ί in openings 42 and 43 of the drum segments are used for Connection of the two mounting surfaces 37 and 38 of the Drum segments and the hub 1 ?. Alignment pins 44 and 4 5 with small tolerances sit in the openings of the Web 32, such an opening is shown at 4-6. These elements keep position changes of the drum segments perpendicular to the drum axis to a minimum *

The drum segments can be attached and detached very quickly; in the attached state, the characters can never be extremely accurately positioned. All tolerances of Befentigimgr · elements shown are in the dimensions of the pins 44 and 4S and the Oüi i oil inungen 46 of the drum segments * These tolerances eri the webs stieren only in the plane 32 and therefore uerden not effective in the axial direction * Any Indermireii the Character arrangement as a result of such tolerances result in a change in the position of the

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Character along the axis of the imaging system (not shown). Such changes, for example of the order of 0.13 to 0.25 mm, move within the range of the focal length of commercially available optical systems, so that no deterioration in the ultimately produced photographic Pressure plate is caused.

Several L-shaped shields 47 bridge the distance between the film strips adjacent to one another. Drum segments ,. so that a normally dark condition is maintained for the electro-optic circuitry to monitor the timing marks 26 on the filmstrip ? A.

A character memory according to the invention enables a quick and easy exchange of fonts, so that desired combinations of fonts can be achieved easily and quickly. This is while maintaining extremely high accuracy of the positioning of the characters possible.

When in Fig. 1 and ?. The embodiment shown, the drum segments 14, 16, 18 and ? 0 made of transparent plastic, for example acrylic glass of optical quality. The use of a transparent drum enables a beam of light to pass through, the drum serving as a rigid and dimensionally stable base for the characters. However, for certain applications, a plastic drum may not have the strength required to prevent unacceptable distortion. Therefore it is advisable to use a drum made of a stronger material *

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In i'ig. 3 and 4 are a perspective and a sectional view of another exemplary embodiment of the invention, in which the drum segments, of which drum segment 48 is shown, are made of a material of relatively high strength, such as aluminum. Since aluminum is not translucent, the cylindrical portion 50 of the segment has ^; ! 8 nine recesses 52 and 53 in the areas in which the characters 54 and the time reference marks 56 of the film strip 58 are arranged. As in the embodiment already described, an adhesive 60 can be used to attach the strip 53 to the outer surface of the cylindrical part 50 of the drum segment 48.

Since the drum segment 48 shown in FIGS. 3 and 4 has a greater strength than the plastic segment shown in FIGS. 1 and 2, it is also not subjected to any distortion due to rotation, so that the counterweights described in connection with FIGS. 1 and 2 are not required are. With regard to its further training can then in Fig. 3 and ^; ! drum segment shown as shown in the ^D'r i% 1 and 2 Trommelnop-menben be considered j'hnlich 48th

The invention is not limited to the AusführvmgsboinpicLe, i; ond> u * n ci3 are more au run sfüh * '"info rms and refinements possible example, different from the in IJ ¹ Lg number shown one greater odor smaller number.. - Trommeinegmorite provided no. As already stated, the drum segments can also be made up of parts other than a cylindrical part and an iJteg; no in. There are many other constructions in question, as far as they are equivalent to the described characters. The characters themselves do not have to

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necessarily have to be on a film strip at the ^ eweiligen zeichenträ ^ ^ he secured they can TIEV formed directly on de.n Träg-er example durcn evaporation auoli * - the *

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Claims (8)

Claims M.) Drum-shaped character memory, in particular for phototypesetting machines, for the selective display of characters at an image location, characterized in that several rigid character carriers (14-, 16, 18, 20) with a partially cylindrical outer surface , each provided with a font group (PP-), are lined up next to one another are replaceably attached to a rotatable holding device (12) forming the drum circumference. 2. Font character memory according to claim 1, characterized in that that i each character carrier (14, 16, 18, 20) is provided with a film strip (24) on which the characters (22) are arranged and which is attached to the part-cylindrical outer surface (30) is attached. 3. Character memory according to claim 1 or 2, characterized in that each character carrier (14, 16, 18, 20) has a radial web (32) on its inner surface, with which it is connected to a radial Flat mounting surface (38) of the cylindrical trained holding device (12) is attached without play. 4. Schri.it:^eichenspeicher according to claim 3 »characterized in that the holding device (12) with AucriclituTirnr.ti 'ton ( ¹ ^ l ₁ > \ ¹ },) and dnr ₍ iev; oi3ige web (32) with these Pins (Ί-Ί, > \ ¹ )) assigned Pführungnöfiriuii (\ en ("■ (>) proceed, with pins ('l'f, 4 * 3) and FHhruncnoiTiiunrrn ('! G) parallel to '.I'rommolnchi'o an- Vi .ordne I r'ind. 3 η 98 10 / (UM.! _BAD0RIGINAL 5 · Character memory according to one of the preceding Claims, characterized in that each character carrier (14, 16, 18, 20) has individual fastening elements (40, 41) are assigned. 6. Character memory according to one of the preceding claims, characterized in that the respective Film strips (24) on the outer surface (30) of the character carrier (14, 16, 18, 20) through an adhesive layer (36) is fixed in the area free of characters (22) or control markings (26) of the film strip (24) is arranged. 7. Character memory according to one of the preceding claims, characterized in that the character carriers (14, 16, 18, 20) are made of transparent plastic. 8. Character memory according to one of claims 1 to 6, characterized in that the character carrier (48) are made of metal and in the area of the characters (54) or control marks (56) are provided with recesses (52, 53). 309810/0805