Typewriting machines – Carriage or carriage-moving or movement-regulating mechanism – Carriage-feed mechanism
Patent
1979-09-07
1982-08-17
Wright, Jr., Ernest T.
Typewriting machines
Carriage or carriage-moving or movement-regulating mechanism
Carriage-feed mechanism
4003291, 400345, B41J 1966
Patent
active
043447147
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a device for positioning the beginning of a line in a typewriter of the type which has a type ball carried by a carriage moving parallel to a platen.
Known devices of this kind include at least a margin stop for the carriage capable of being set in position in relation to a margin rack for defining the beginning of the lines of writing. The margin rack is mounted and slidable against the action of an elastic element in a direction parallel to that of the movement of the carriage, with an escapement pawl being carried by the carriage and working with a fixed rack bar and a universal bar which ensures that the pawl is kept in a disengaged position relative to the rack bar during the return of the carriage to the beginning of the line.
At the end of the line, in order to pass to the following line, the carriage is brought back to position at the beginning of the line by a motor, and the escapement pawl is removed from position on the rack bar by the action of a universal bar, while the platen rotates a space corresponding to the space between the lines. At the end of the return movement, the carriage comes to a stop against the margin stop, which causes a movement of the sliding margin rack on which the margin stop is fixed. The movement of the margin rack in relation to the chassis is used to control the stopping the movement of the carriage and the action of the universal bar acting on the escapement pawl. Because of the presence of an elastic element such as a spring between the sliding margin rack and the chassis of the machine, there may be a sufficient distortion of these elastic elements at the time of impact of the carriage against the margin stop to make the escapement pawl fall back into a notch of the rack bar, the notch being displaced in relation to that which is determined by the position of the margin stop. In the case of a more rigid construction in which the movement of the sliding margin rack is limited at the most to one step of the rack bar, there may be a repeated jump of the carriage also causing a poor position at the beginning of the line of writing.
The invention has for its object assuring the positioning of the first column of writing by the use of parts which are lightweight and thus inexpensive.
The device for positioning the beginning of the line, which is the object of the invention, is characterized by the fact that the sliding margin rack works together with the means for locking the pawl in a disengaged position relative to the rack bar during the movement of said sliding margin rack.
The single FIGURE of the attached drawing shows, schematically, and by way of example, a perspective view of a preferred manner of execution of the device, which is the object of the invention.
A carriage, 1, slides parallel to the axis of a platen 35, and carries a typing 34 ball. It includes a stop, 2, which abuts margin stop 13 to effect sliding of the stop 2 along the length of an axle, 3, against the action of a compression spring, 4. The axle, 3, is secured at each end to lateral walls 1a and 1b of the carriage, 1. An escapement pawl, 5, is mounted on a pivot, 6, of the carriage 1. A tooth, 8, of the pawl, 5, is engaged under the effect of a traction spring, 7, in the notches, 9, of a rack bar, 10, which is solidly joined to the typewriter.
A universal bar, 11, pivoting around an axis parallel to the platen 35, is capable of working together with a spur, 12, of the pawl, 5.
A margin stop, 13, includes two hooks, 14 and 15, surrounding a shaft, 16, attached to the chassis 36 of the typewriter, and a spur, 17, engaged in one of the notches, 18, of a margin rack, 19. The margin rack, 19, is provided with two oblong holes, 20 and 21, at its ends, through which pass two shafts, 22 and 23, attached to the chassis 36. The margin rack, 19, guided by the shafts, 22 and 23, may slide in a direction parallel to the direction of movement of the carriage, 1, against the action of a spring, 24, attached, on the one hand, to the chassis 36 and, on the other hand, to said ma
REFERENCES:
patent: 1955614 (1934-04-01), Thompson et al.
patent: 2872013 (1959-02-01), Wittwer
patent: 3126998 (1964-03-01), Palmer
patent: 3263793 (1966-08-01), Brignole, Jr.
patent: 3441119 (1969-04-01), Schweizer
patent: 3572487 (1971-03-01), Rolph et al.
patent: 3625332 (1971-12-01), McGrath
patent: 3752289 (1973-08-01), Link
patent: 3978967 (1976-09-01), Gagnebin
Hermes Precisa International S.A.
Wright, Jr. Ernest T.
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