Typewriting machines – Including type-set-assemblage mounted on carrier and... – Imprint by pivoting of type-head-carrier and type-head...
Patent
1979-10-19
1982-09-07
Wright, Jr., Ernest T.
Typewriting machines
Including type-set-assemblage mounted on carrier and...
Imprint by pivoting of type-head-carrier and type-head...
400 8, 400161, B41J 132
Patent
active
043481213
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a strike and non-strike impact control mechanism for a typewriter having a printing element which moves parallel to the platen on a carrier.
In a known mechanism of this type, the carrier comprises notably a drive shaft, two integral cams in rotation around the drive shaft and corresponding to different strike forces, means for displacement of a tracker of the radial contour of the cams designed to cause said tracker to work in connection with one or the other or neither of the cams, means for transmission of the movement of the tracker to the printing element, to assure the striking of a character in particular, and means for receiving control signals given by universal bars arranged parallel to the platen.
In known machines, means for displacement of the tracker are held in their normal position by the action of a spring. Upon the striking of a character requiring a different strike force, particularly a weaker one, universal bars transmit a command impulse and said reception means drive the tracker displacement means into another position in opposition to the force of the spring. During a strike, the position of the reception means is maintained by known blocking apparatus. Following a strike, the means for receiving command impulses are freed and the tracker displacement means return to their normal position by the action of the spring.
Such a mechanism requires a relatively high transfer of mechanical energy within the machine's command components, particularly within the universal bars and strike impulse reception means.
In fact, the control components must transmit sufficient force to compress the return spring and overcome the inertial forces of the parts set in motion.
Furthermore, the amplitude of the command impulses must be quite precise in order for the reception means blocking apparatus to work in connection with them.
In order for such a mechanism to be reliable under these conditions, it is necessary to provide sturdy command components and command impulse amplitude adjustment devices, as well as an apparatus for compensation of component deformation, all of which have the effect of increasing still further the inertial forces of the mechanism, as well as its cost.
The purpose of the present invention is to eliminate these drawbacks and to limit the forces transmitted by the command components in the transmission of an impulse.
The mechanism according to the invention is characterized in that it comprises an abutment apparatus, means for displacement of the tracker into several positions, activation of which is controlled by command impulse reception means, a pressurized spring acting upon the tracker displacement means so as to cause them to work together with said abutment apparatus, and apparatus for returning displacement means to their initial position, said apparatus being driven by the active drive shaft upon each complete rotation of said shaft.
The attached drawing shows schematically and by way of example one form of execution of the mechanism subject of the invention.
FIG. 1 is a cutaway section of the tracker of the machine showing the strike mechanism.
FIG. 2 represents in perspective the strike force control mechanism in its initial position. FIGS. 3 and 6 show the same mechanism in two other positions.
FIGS. 4 and 7 show a detail of FIGS. 3 and 6.
FIGS. 5 and 8 are elevation views of one part of the control mechanism in two positions corresponding to those illustrated in FIGS. 3 and 6.
Since typewriters with a printing element which moves parallel to the platen on a carrier are well known in the art, only those components indispensable to an understanding of the invention will be illustrated and described in the following.
Referring first to FIG. 1, a printing element 1 is integral with a carrier 2 including two lateral walls 2' only one of which is shown, activated by a movement of translation parallel to axis Z of a platen 3. During said movement of translation, the carrier 2 slides along a drive shaft 4 rotatable at its two extremes upon the
REFERENCES:
patent: 3239049 (1966-03-01), Voit
patent: 3618736 (1971-11-01), Abell et al.
patent: 3788443 (1974-01-01), Menzi
patent: 3980169 (1976-09-01), Decker et al.
IBM Technical Disclosure Bulletin, "Print Velocity Control Device", Abell et al., vol. 12, No. 7, Dec. 1969, p. 1032.
Groff, Jr. Emory L.
Hermes Precisa International S.A.
Wright, Jr. Ernest T.
LandOfFree
Strike and non-strike impact control mechanism for typewriter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Strike and non-strike impact control mechanism for typewriter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Strike and non-strike impact control mechanism for typewriter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1340227