Patent GB-1048699-A (GB)
Title: Printing mechanism for calculating, accounting and like machines
Inventor: THEVIS PAUL
IPC: G06C11/04
Filed: 1963-08-30
Abstract: 1,048,699. Selective printers. OLYMPIA WERKE A.G. Aug. 30, 1963, No. 34397/63. Heading B6F. [Also in Division G4] Type-wheel machines.-A printing mechanism for calculating or accounting machines, wherein type wheels 1, one for each digital place, are separated from their associated setting members 2 during a printing operation and are locked in the set position by a pin 19 entering a slot 21 in jaw 17 of a hammer lever 13 and type wheel rocking lever 15, respectively, is characterized in that when the printing operation is initiated the hammer lever 13 engages inner teeth 24 in the set position to align the type wheel both radially and axially and then to impel the type wheel segment 23 against a platen 27. Hammer impression arrangements; aligning for impression.-In operation the digital value setting member 2. is turned counterclockwise to cause the type wheel 1 to turn and bring the selected numerical type 26 opposite the platen 27. As the setting member 2 rotates its spin 3 releases a release bar 4, which is spring-urged into contact with a rocker 8, which when displaced by control means (not shown) pushes the release bar 4 to the right to pivot a support lever 6 counter-clockwise. As the lever 6 pivots, its shoulder 10 releases a hook 11 of the hammer lever 13, which pivots clockwise, whereby the hammer head 13a engages with its slot 25 one of the inner teeth 24 of the type segment 23 to align the type wheel both axially and radially, whilst the type wheel is still in contact with the setting member 2. Further pivotal movement of the hammer lever 13 under the action of a spring 14 causes a pin 19, attached to a locking bar 18 and, passing through a slot 21 in the hammer lever 13, to enter a jaw 17 in the type wheel rocking lever 15, so as to lock the rocking lever and hammer lever 13 together, which takes place subsequently. Following impression the hammer lever 13 is restored by a restoring bar 30, controlled by a machine drive (not shown) and the notched end of the lever 15 comes to rest against a stop 29, the lever being locked against movement by the pin 19, engaging a chamfered surface 17a of a jaw 17. When the hammer lever 13 has re-engaged the shoulder 10 of the support lever 6 the setting member 2 restores the type wheel 1 to its initial position. Zero-suppression arrangements; hammer suppression arrangements.-The printing of the first insignificant zeros is inhibited by provision of pins 3 on the setting members 2, which are not displaced as the zero digits correspond to the lowermost type 26 on the type segment 23. Since the setting member is not displaced counter-clockwise the pin 3 does not permit the release bar 4 to move into contact with the rocker 8, so that the latter cannot engage the notched portion of the bar 4, which pivots the support lever 6, whose shoulder 10 triggers the hammer lever 13 to effect impression. Printing of significant zeros.-Significant zeros intermediate a numerical value are printed in that a lug 32 on the support lever 6 of the successive digital value engages the support lever 6 of a zero digit to trigger the hammer lever 13.