Typewriter mechanism for automatically loading and ejecting paper
AssigneeHermes Precisa International S.A.
InventorOtto Aebi
Life of this patent
Estimating the term…
Abstract
The typist sets a scale to the desired length of paper to be introduced, thereby determining the angle through which a toothed third wheel rotates. Depression of the automatic loading key opens the paper bail and couples the third wheel to a driven toothed first wheel and to a toothed second wheel, which latter turns the platen. The third wheel turns until a finger thereon operates on mechanical linkage to uncouple the three wheels and disconnect the first wheel from the motor. When the automatic ejection key is depressed, the second wheel is meshed with the first wheel, which is coupled to the motor as long as the key is held down, thereby rotating the platen.
Claims11
In a mechanism for automatically loading paper into and ejecting paper from a typewriter, said typewriter having an electric motor, a platen, means for rotating said platen, adjusting means under control of the typist for setting the amount of angular movement of said platen depending on the length of paper that is to be loaded into the typewriter, and a paper bail, the improvement wherein said means for rotating said platen comprises a first control means for continuously rotating said platen to eject paper from the typewriter, and a second control means for rotating said platen for a limited period of time depending on the setting of said adjusting means so as to automatically introduce the desired length of paper into the typewriter for typing, means cooperating with said second control means and controlled thereby for opening said paper bail whenever said second control means is operative, actuating means for selectively rendering said first or second control means operative, said means for rotating said platen further including first toothed wheel means, a rotatable shaft on which said first toothed wheel means is rotationally rigidly mounted, said electric motor including a drive shaft, means for drivingly coupling said drive shaft to said rotatable shaft to rotate the latter whenever said first or second control means is operative, said first control means including second toothed wheel means, said second control means including third toothed wheel means, said first control means including connecting means for meshing said first and second toothed wheel means whenever said first control means is operative, said second control means including connecting means for meshing said first, second and third toothed wheel means whenever said second control means is operative, said second and third toothed wheel means mounted on said rotatable shaft and free to rotate thereon and to move lengthwise therealong, and said second toothed wheel means being drivingly connected to said platen to rotate the latter.
In a mechanism for automatically loading paper into and ejecting paper from a typewriter, said typewriter having an electric motor, a platen, means for rotating said platen, adjusting means under control of the typist for setting the amount of angular movement of said platen depending on the length of paper that is to be loaded into the typewriter, and a paper bail, the improvement wherein said means for rotating said platen comprises a first control means for continuously rotating said platen to eject paper from the typewriter, and a second control means for rotating said platen for a limited period of time depending on the setting of said adjusting means so as to automatically introduce the desired length of paper into the typewriter for typing, means cooperating with said second control means and controlled thereby for opening said paper bail whenever said second control means is operative, actuating means for selectively rendering said first or second control means operative, said means for rotating said platen further including first toothed wheel means, a rotatable shaft on which said first toothed wheel means is rotationally rigidly mounted, said electric motor including a drive shaft, means for drivingly coupling said drive shaft to said rotatable shaft to rotate the latter whenever said first or second control means is operative, said first control means including second toothed wheel means, said second control means including third toothed wheel means, said first control means including connecting means for meshing said first and second toothed wheel means whenever said first control means is operative, said second control means including connecting means for meshing said first, second and third toothed wheel means whenever said second control means is operative, said second toothed wheel means being drivingly connected to said platen to rotate the latter, said first and second control means capable of functioning independently of each other.
Dependencies are inferred from the claim text.