Claims
- 1. A typing device comprising:
- a sheet-carrying platen defining a printing line and a typing point;
- a character-bearing disk comprising a plurality of laminae each carrying a type character and terminating in a free end on the periphery of said disk;
- means defining a gap in the outermost periphery of said disk;
- input means for serially entering characters to be printed;
- type character selecting means responsive to a character entered by said input means for rotating said disk and arresting the same so as to align a selected one of said laminae in front of said typing point, such rotation of said disk beginning from a rest variable position defined by the position reached by said disk upon printing the next preceding selected character;
- striking means for impacting the selected lamina to type the selected character, said selecting means maintaining said selected lamina in front of said striking means after the impacting thereof; and
- means responsive to the absence of entered characters in said input means within a predetermined period of time after the entering of the last preceding entered character for rotating said disk from its last position wherein the last selected lamina is in front of said striking means to a position wherein said gap is aligned with said typing point, whereby the last typed characters can be seen through said gap.
- 2. A typing device according to claim 1, wherein said input means comprises an actuatable keyboard and wherein said means responsive to the absence of entered characters comprise a delay circuit operative on said selecting means after said keyboard has not been actuated for at least said predetermined period period of time for aligning a predetermined portion of said gap with said typing point.
- 3. A typing device comprising:
- a sheet-carrying platen defining a printing line and a typing point;
- a character-bearing disk comprising a plurality of laminae each carrying a type character and terminating in a free end on the periphery of said disk;
- means defining a gap in the outermost periphery of said disk;
- input means for serially entering characters to be printed;
- type character selecting means responsive to a character entered by said input means for rotating said disk and arresting the same so as to align a selected one of said laminae in front of said typing point, such rotation of said disk beginning from a rest variable position defined by the position reached by said disk upon printing the next preceding selected character;
- striking means for impacting the selected lamina to type the selected character;
- means responsive to the absence of entered characters in said input means within a predetermined period of time after the entering of the last preceding entered character for rotating said disk to align said gap with said typing point, whereby the last typed characters can be seen through said gap; and
- index means adjacent said gap for indicating the typing point in said printing line.
- 4. A typing device according to claim 3 wherein said index means comprise a lamina which is shorter than the other laminae and carries a (underline) sign.
- 5. A typing device comprising a selector shaft, a character-bearing disk constructed of flexible plastics material and means for removably fixing said disk to said selector shaft, said selector shaft having a shaft axis, a conical end and flange means, extending radially outwardly a predetermined radial distance from said shaft axis and defining a rotation plane perpendicular to said shaft axis, wherein the character-bearing disk includes a plurality of laminae, a central part and a conical seat, cooperative, respectively, with said flange means and said conical end for aligning said laminae in a plane parallel to said rotation plane, wherein said shaft and said disk each comprises attachment portions radially spaced from said shaft axis a distance less than said predetermined radial distance; and wherein said fixing means comprise a hooked element engageable with the attachment portions at said shaft and said disk for fixing the disk to the selector shaft by making said central part adhere to said flange means and said conical seat adhere to said conical end taking up any possible play therebetween, said hooked element being releasable from said attachment portions for the removing of said disk from said selector shaft.
- 6. A typing device according to claim 5, wherein said hooked element is supported by the central part of said disk for being manually operable between a first position and a second position; to cause the disk to be fixed to and, respectively, released from said selector shaft; further comprising;
- a spring member connecting said central part with said hooked element for elastically holding the same stably in either of said first and second positions, passing through an unstable position of the hooked element intermediate said first and said second positions.
- 7. A typing device comprising a character-bearing disk having a central part and a plurality of flexible laminae, each lamina carrying a particular character; a selector shaft having a shaft axis and including a flange fixed to said shaft; and means for removably fixing the disk to the shaft, said fixing means comprising:
- a hooked element supported by the central part of said disk and manually operable between a first position and a second position;
- said hooked element in said first position cooperating with said flange for fixing said central part to said flange coaxially to said shaft axis, and said hooked element, in said second position, releasing said flange for enabling said disk to be manually removed from said selector shaft; and
- a spring member connecting said central part with said hooked element for holding the same stably in either of said first and second positions, passing through an unstable position of the hooked element intermediate said first and said second positions; wherein said flange and said disk are provided with corresponding registering apertures located diametrically opposite with respect to said shaft axis, wherein said flange comprises support edges adjacent to the apertures of said flanges and said hooked element is fulcrumed on said disk and comprises two L-shaped arms for passing through said apertures, and wherein each of said arms has a wedge-shaped end arranged to exert pressure on the support edges of said flange, in the first position of said hooked element.
- 8. A typing device according to claim 7, wherein said hooked element comprises a cylindrical part designed to turn movably on a corresponding concave seat of said disc.
- 9. A typing device according to claim 7, wherein said spring member comprises a C-shaped spring of the compression type, and C-shaped spring having a central part guided by a seat in said central part of said disc and two terminals guided by corresponding seats of said L-shaped arms.
Priority Claims (1)
Number |
Date |
Country |
Kind |
68815 A/73 |
Jun 1973 |
ITX |
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Parent Case Info
This is a continuation, of application Ser. No. 709,126, filed July 27, 1976, now abandoned, which is a division of Ser. No. 475,122, filed May 31, 1974, now U.S. Pat. No. 3,983,985.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2159261 |
Aug 1972 |
DEX |
Divisions (1)
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Number |
Date |
Country |
Parent |
475122 |
May 1974 |
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Continuations (1)
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Number |
Date |
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Parent |
709126 |
Jul 1976 |
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