EP0437005B1 - Daisy wheel for typewriters or the like - Google Patents
Daisy wheel for typewriters or the like Download PDFInfo
- Publication number
- EP0437005B1 EP0437005B1 EP90250327A EP90250327A EP0437005B1 EP 0437005 B1 EP0437005 B1 EP 0437005B1 EP 90250327 A EP90250327 A EP 90250327A EP 90250327 A EP90250327 A EP 90250327A EP 0437005 B1 EP0437005 B1 EP 0437005B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hub
- daisy wheel
- drive shaft
- webs
- wheel according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
- B41J1/22—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection
- B41J1/24—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection the plane of the type or die face being perpendicular to the axis of rotation
- B41J1/28—Carriers stationary for impression, e.g. with the types or dies not moving relative to the carriers
- B41J1/30—Carriers stationary for impression, e.g. with the types or dies not moving relative to the carriers with the types or dies moving relative to the carriers or mounted on flexible carriers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
- B41J1/22—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection
- B41J1/24—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection the plane of the type or die face being perpendicular to the axis of rotation
- B41J1/243—Mounting or fixing the carriers
Definitions
- the invention relates to a type disk for typewriters or the like.
- a hub made of resilient plastic and with radially outwardly directed from the hub, designed as a type support, resilient spokes, in which the hub has a central hole for initiating rotary movements in the type disk
- Serving drive shaft of the typewriter is provided and has on its side facing the free end of the drive shaft projecting resilient webs with locking lugs that can snap into an annular groove of the drive shaft, the rear sides of the webs being at a distance from the axis of the type plate that is less than half the diameter of the central hole of the hub.
- the invention has for its object to provide a type plate of the type under consideration, which can be produced with simple injection molding tools and which ensures a secure fit on the drive shaft with easy assembly and disassembly despite low production costs.
- This object is achieved according to the invention in a relevant type plate in that the latching lugs are arranged at the free ends of the webs which are designed as cantilever arms which are deformable in a plane parallel to the object.
- the type plate according to the invention offers the advantage of low manufacturing costs and high flexibility of the cantilever arms in the radial direction with high rigidity in the axial direction.
- FIGS. 1 to 3 1 is the property of a type disk, from which spring-elastic spokes, not shown in a known manner, extend outward with types arranged at their free ends.
- the hub 1 has a central hole 2, the diameter of which corresponds to the diameter of a drive shaft 3.
- the locking lugs 7 are arranged on the inner sides of the free ends of crescent-shaped cantilever arm sections 8, the backs 9 of which, viewed in the axial direction of the type plate (cf. FIG. 1), are at a distance from the inner wall 10 of the central hole.
- the ends of the cantilever arm sections facing away from the latching lugs 7 are connected to the hub 1 via short, radially outwardly directed cantilever arm sections 11, the cantilever arm sections 11 forming integral components of the hub 1.
- Around the cantilever arm sections 8 in the axial direction A sufficient rigidity, but to impart sufficient flexibility in the radial direction, they have a substantially rectangular cross section, ie viewed in Figures 2 and 3, their height is greater than their width.
- the cantilever arm sections 8 can be injection molded with simple means, that is, in particular, there is no need for metallic inserts which ensure the mobility or resilience of the resilient cantilever arm sections 8 .
- FIGS. 1 to 3 show the hub of a type plate, which is intended for drive shafts 3, the expansion head has a significantly smaller diameter than the hole 2 of the type plate.
- FIGS. 4 to 6 show an embodiment which is intended for drive shafts 12, the expansion head 13 of which has a diameter which is only slightly smaller than the diameter of the main part of the drive shaft 12.
- the hub 1 it is necessary to have the hub 1 to provide the type plate with a central hole 14, the diameter of which is larger than the diameter of the expansion head 13.
- too, gaps are obtained between the back 9 of the cantilever arm sections 8 and the inner wall 16 of the central hole 14 in the axial direction of the drive shaft 12 and the type plate, which enable inexpensive production of the type plate.
Description
Die Erfindung betrifft eine Typenscheibe für Schreibmaschinen od. dgl. mit einer Nabe aus federelastischem Kunststoff und mit von der Nabe strahlenartig nach außen gerichteten, als Typenträger ausgebildeten federelastischen Speichen, bei der die Nabe mit einem zentralen Loch für eine zur Einleitung von Drehbewegungen in die Typenscheibe dienende Antriebswelle der Schreibmaschine versehen ist und über ihre dem freien Ende der Antriebswelle zugewandten Seite vorstehende federnde Stege mit Rastnasen aufweist, die in eine Ringnut der Antriebswelle einrasten können, wobei die Rückseiten der Stege von der Achse der Typenscheibe einen Abstand haben, der kleiner ist als der halbe Durchmesser des zentralen Loches der Nabe.The invention relates to a type disk for typewriters or the like. With a hub made of resilient plastic and with radially outwardly directed from the hub, designed as a type support, resilient spokes, in which the hub has a central hole for initiating rotary movements in the type disk Serving drive shaft of the typewriter is provided and has on its side facing the free end of the drive shaft projecting resilient webs with locking lugs that can snap into an annular groove of the drive shaft, the rear sides of the webs being at a distance from the axis of the type plate that is less than half the diameter of the central hole of the hub.
Aus der DE-OS 36 37 437 ist eine Typenscheibe der vorstehenden Art bekannt, bei der als federnde Stege ausgebildete Rastelemente mit wulstartigen Rastnasen verwendet werden, die in eine Ringnut einer Antriebswelle greifen. Die Nachgiebigkeit der gewissermaßen an beiden Enden eingespannten Stege ist stark begrenzt, d.h. sie lassen sich in Radialrichtung nicht hinreichend deformieren. Eine ausreichende Deformationsmöglichkeit ist aber nicht nur im Hinblick auf die bequeme Montage und Demontage erforderlich, sondern auch insofern vonnöten, als durch sie unvermeidbare Herstellungstoleranzen ausgeglichen werden können.From DE-OS 36 37 437 a type plate of the above type is known, in which locking elements designed as resilient webs with bead-like locking lugs are used, which engage in an annular groove of a drive shaft. The flexibility of the webs, which are clamped at both ends, is severely limited, i.e. they cannot be deformed sufficiently in the radial direction. A sufficient possibility of deformation is not only necessary with regard to the convenient assembly and disassembly, but also insofar as it can compensate for inevitable manufacturing tolerances.
Bekannt ist außerdem aus der US-PS 39 86 593 eine Typenscheibe, bei der die Rastelemente von zwei zangenartigen Vorsprüngen der Nabe gebildet werden. Die Vorsprünge bilden in Achsrichtung verlaufende federnde Stege, an deren freie Enden sich Anschlagwinkel anschließen, von denen ein jeder jeweils ein Joch trägt, das in eine Ringnut der Antriebswelle einrasten kann. Um den Überstand der Vorsprünge in Grenzen zu halten und gleichzeitig eine ausreichende Festigkeit der Stege zu gewährleisten, bedarf es bei der Montage und Demontage der zweiten bekannten Typenscheibe zusätzlicher, vom Benutzer aufzubringender Kräfte. Die Vorsprünge haben zudem eine derart komplizierte Form, daß sie spritztechnisch, wenn überhaupt, dann nur mit einem erheblichen Werkzeugaufwand realisierbar sind.From US-PS 39 86 593 is also known a type plate in which the locking elements are formed by two pliers-like projections of the hub. The projections form in the axial direction running resilient webs, at the free ends of which stop angles are connected, each of which carries a yoke, which can snap into an annular groove in the drive shaft. In order to keep the protrusion of the protrusions within limits and at the same time to ensure sufficient strength of the webs, additional forces which are to be exerted by the user are required for the assembly and disassembly of the second known type plate. The projections also have such a complicated shape that they can only be realized by injection molding, if at all, with a considerable amount of tools.
Der Erfindung liegt die Aufgabe zugrunde, eine Typenscheibe der in Betracht gezogenen Art zu schaffen, die sich mit einfachen Spritzgußwerkzeugen herstellen läßt und die trotz niedriger Produktionskosten einen sicheren Sitz auf der Antriebswelle bei leichter Montier- und Demontierbarkeit gewährleistet. Diese Aufgabe wird bei einer einschlägigen Typenscheibe erfindungsgemäß dadurch gelöst, daß die Rastnasen an den freien Enden der als in einer zur Habe parallelen Ebene verformbare Auslegerarme ausgebildeten Stege angeordnet sind.The invention has for its object to provide a type plate of the type under consideration, which can be produced with simple injection molding tools and which ensures a secure fit on the drive shaft with easy assembly and disassembly despite low production costs. This object is achieved according to the invention in a relevant type plate in that the latching lugs are arranged at the free ends of the webs which are designed as cantilever arms which are deformable in a plane parallel to the object.
Die erfindungsgemäße Typenscheibe bietet den Vorteil niedriger Herstellungskosten und einer hohen Flexibilität der Auslegerarme in Radialrichtung bei hoher Steifigkeit in Axialrichtung.The type plate according to the invention offers the advantage of low manufacturing costs and high flexibility of the cantilever arms in the radial direction with high rigidity in the axial direction.
Weitere Einzelheiten und Merkmale der Erfindung ergeben sich aus den Unteransprüchen und der nachstehenden Beschreibung zweier in der den Kern der Erfindung verdeutlichenden Zeichnung dargestellter Ausführungsformen. Es zeigen:
- Fig. 1
- die Draufsicht auf den Nabenkörper einer ersten Typenscheibe,
- Fig. 2
- einen Schnitt längs der Linie II-II in Fig. 1,
- Fig. 3
- einen Schnitt längs der Linie III-III in Fig. 1.
- Fig. 4
- die Draufsicht auf den Nabenkörper einer zweiten Typenscheibe,
- Fig. 5
- einen Schnitt längs der Linie V-V in Fig. 4 und
- Fig. 6
- einen Schnitt längs der Linie VI-VI in Fig. 4.
- Fig. 1
- the top view of the hub body of a first type plate,
- Fig. 2
- 2 shows a section along the line II-II in FIG. 1,
- Fig. 3
- a section along the line III-III in Fig. 1st
- Fig. 4
- the top view of the hub body of a second type plate,
- Fig. 5
- a section along the line VV in Fig. 4 and
- Fig. 6
- a section along the line VI-VI in Fig. 4th
In den Figuren 1 bis 3 ist 1 die Habe einer Typenscheibe, von der aus sich in bekannter Weise nicht dargestellte federelastische Speichen mit an ihren freien Enden angeordneten Typen nach außen erstrecken. Die Nabe 1 weist ein zentrales Loch 2 auf, dessen Durchmesser dem Durchmesser einer Antriebswelle 3 entspricht. An der Stirnseite der Antriebswelle 3 ist diese mit einem Spreizkopf 4 versehen, dessen der Antriebswelle 3 abgewandtes Ende einen Spreizkegel 5 bildet und dessen der Antriebswelle 3 zugewandtes Ende zusammen mit der Stirnseite der Antriebswelle 3 eine umlaufende Nut 6 zur Aufnahme von zur Arretierung der Typenscheibe auf der Antriebswelle 3 dienenden Rastnasen 7 formt. Die Rastnasen 7 sind an den Innenseiten der freien Enden sichelförmiger Auslegerarmabschnitte 8 angeordnet, deren Rücken 9 in Axialrichtung der Typenscheibe betrachtet (vgl. Fig. 1) einen Abstand zur Innenwand 10 des zentralen Loches einnehmen. Die den Rastnasen 7 abgewandten Enden der Auslegerarmabschnitte sind mit der Nabe 1 über kurze radial nach außen gerichtete Auslegerarmabschnitte 11 verbunden, wobei die Auslegerarmabschnitte 11 integrale Bestandteile der Nabe 1 bilden. Um den Auslegerarmabschnitten 8 in axialer Richtung eine hinreichende Steifigkeit, in radialer Richtung dagegen eine hinreichende Flexibilität zu vermitteln, haben sie einen im wesentlichen rechteckigen Querschnitt, d.h. in den Figuren 2 und 3 betrachtet ist ihre Höhe größer als ihre Breite. Dadurch, daß der Rücken 9 der Auslegerarmabschnitte 8 gegenüber der Innenwand 10 des Loches 2 radial nach innen versetzt ist, lassen sich die Auslegerarmabschnitte 8 spritztechnisch mit einfachen Mitteln realisieren, d.h. es bedarf insbesondere keiner die Beweglichkeit bzw. Nachgiebigkeit der federnden Auslegerarmabschnitte 8 sicherstellenden metallischen Einlagen.In FIGS. 1 to 3, 1 is the property of a type disk, from which spring-elastic spokes, not shown in a known manner, extend outward with types arranged at their free ends. The
Die Figuren 1 bis 3 zeigen die Nabe einer Typenscheibe, die für Antriebswellen 3 bestimmt ist, deren Spreizkopf einen deutlich kleineren Durchmesser als das Loch 2 der Typenscheibe hat. In den Figuren 4 bis 6 dagegen ist eine Ausführungsform dargestellt, die für Antriebswellen 12 bestimmt ist, deren Spreizkopf 13 einen Durchmesser hat, der nur wenig kleiner ist als der Durchmesser des Hauptteiles der Antriebswelle 12. In diesem Fall ist es erforderlich, die Nabe 1 der Typenscheibe mit einem zentralen Loch 14 zu versehen, dessen Durchmesser größer ist als der Durchmesser des Spreizkopfes 13. Um trotzdem einen einwandfreien Sitz der Typenscheibe auf der Antriebswelle 12 zu gewährleisten, sind im Bereich der Übergänge zwischen den sichelförmigen Auslegerarmabschnitten 8 und den geraden Auslegerarmabschnitten 11 Führungsstege 15 für die Antriebswelle 12 angeordnet. Auch bei der zweiten Ausführungsform erhält man mithin zwischen dem Rücken 9 der Auslegerarmabschnitte 8 und der Innenwand 16 des zentralen Loches 14 in Axialrichtung von Antriebswelle 12 und Typenscheibe betrachtet Spalte, die eine kostengünstige Fertigung der Typenscheibe ermöglichen.Figures 1 to 3 show the hub of a type plate, which is intended for
Claims (6)
- A daisy wheel for typewriters or the like, with a hub (1) of an elastic plastics material and with elastic spokes carrying printing type radiating outwardly from the hub (1) wherein the hub (1) is provided with a central hole (2) for a drive shaft (3) of the typewriter which serves to impart rotary motion to the daisy wheel and is provided with elastic webs with detent lugs (7) projecting above the side facing the free end of the drive shaft (3), the said detent lugs (7) engagable in the annular groove (6) of the drive shaft (3), with the reverse sides of the webs set at a distance from the axis of the daisy wheel which is less than half the diameter of the central hole (2) of the hub (1), characterised in that the detent lugs (7) are arranged on the free ends of the webs, the latter being in the form of bracket arms (8, 11) and being deformable in a plane parallel to the hub (1).
- A daisy wheel according to claim 1, characterised in that guide webs (15) for the drive shaft (12) are arranged in the region of the ends of the bracket arms (8, 11) facing away from the detent lugs (7).
- A daisy wheel according to either claim 1 or claim 2, characterised in that the bracket arms (8, 11) are provided with bow or sickle-shaped bracket arm sections (8), which merge into straight bracket arm sections (11) which are connected to the hub (1).
- A daisy wheel according to claim 3, characterised in that the straight bracket arm sections (11) extend radially outwards.
- A daisy wheel according to any one of claims 1 to 4, characterised in that it is provided with three bracket arms (8, 11) distributed uniformly around the hub (1).
- A daisy wheel according to any one of claims 1 to 5, characterised in that the bracket arms (8, 11) have a substantially rectangular cross-section, with the narrow sides of the rectangle oriented parallel to the hub (1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4001080 | 1990-01-12 | ||
DE4001080A DE4001080A1 (en) | 1990-01-12 | 1990-01-12 | TYPE DISC FOR TYPEWRITERS OR THE LIKE |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0437005A1 EP0437005A1 (en) | 1991-07-17 |
EP0437005B1 true EP0437005B1 (en) | 1995-06-14 |
Family
ID=6398168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90250327A Expired - Lifetime EP0437005B1 (en) | 1990-01-12 | 1990-12-21 | Daisy wheel for typewriters or the like |
Country Status (5)
Country | Link |
---|---|
US (1) | US5106214A (en) |
EP (1) | EP0437005B1 (en) |
JP (1) | JPH04314549A (en) |
KR (1) | KR910014217A (en) |
DE (1) | DE4001080A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4339239C1 (en) * | 1993-11-12 | 1995-04-27 | Ransmayer A & Rodrian A | Type plate for a typewriter |
US8580326B2 (en) | 2004-04-08 | 2013-11-12 | Cargill, Incorporated | Treating meat from dark-cutting carcasses using an acidification process |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3878929A (en) * | 1973-11-23 | 1975-04-22 | Pitney Bowes Inc | Type disc with integral coupling device |
US3986593A (en) * | 1975-05-14 | 1976-10-19 | Pitney-Bowes, Inc. | Snap-action fastener assembly |
DE8129561U1 (en) * | 1981-10-08 | 1982-03-11 | Alfred Ransmayer & Albert Rodrian, 1000 Berlin | TYPE WHEEL |
DE3140177A1 (en) * | 1981-10-08 | 1983-04-28 | Alfred Ransmayer & Albert Rodrian, 1000 Berlin | Daisywheel |
CH648790A5 (en) * | 1982-04-05 | 1985-04-15 | Caracteres Sa | DEVICE FOR THE REMOVABLE FIXING OF A PRINTING MACHINE CHARACTER DISC ON THE DRIVE SHAFT WHICH DRIVES IT. |
US4465387A (en) * | 1982-09-30 | 1984-08-14 | Data Motion, Inc. | Daisy wheel mounting apparatus |
CH651503A5 (en) * | 1983-02-09 | 1985-09-30 | Caracteres Sa | CHARACTER-HOLDER DISC FOR PRINTER MACHINE. |
US4496254A (en) * | 1983-03-18 | 1985-01-29 | Primages, Inc. | Method and apparatus for mounting a daisy print wheel on the shaft of a print head |
SU1260252A1 (en) * | 1983-05-12 | 1986-09-30 | Специальное Конструкторское Бюро Средств Отображения Информации | Tab-disk tyre carrier |
CH654526A5 (en) * | 1983-11-25 | 1986-02-28 | Caracteres Sa | CHARACTER-HOLDER DISC FOR PRINTER MACHINE. |
CH656836A5 (en) * | 1984-05-22 | 1986-07-31 | Caracteres Sa | CHARACTER-HOLDER DISC FOR PRINTER MACHINE. |
US4591282A (en) * | 1984-06-29 | 1986-05-27 | International Business Machines Corporation | Drive mechanism for a ribbon disc |
DE3637437A1 (en) * | 1985-11-07 | 1987-05-14 | Caracteres Sa | Type wheel for a printer |
-
1990
- 1990-01-12 DE DE4001080A patent/DE4001080A1/en active Granted
- 1990-12-21 EP EP90250327A patent/EP0437005B1/en not_active Expired - Lifetime
- 1990-12-21 US US07/633,046 patent/US5106214A/en not_active Expired - Fee Related
-
1991
- 1991-01-10 JP JP3013037A patent/JPH04314549A/en active Pending
- 1991-01-11 KR KR1019910000321A patent/KR910014217A/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
EP0437005A1 (en) | 1991-07-17 |
DE4001080A1 (en) | 1991-07-18 |
US5106214A (en) | 1992-04-21 |
JPH04314549A (en) | 1992-11-05 |
KR910014217A (en) | 1991-08-31 |
DE4001080C2 (en) | 1991-10-24 |
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