Patent GB-570485-A (GB)
Title: Improvements in numbering machines
IPC: B41K1/16
Filed: 1944-04-11
Abstract: 570,485. Number-printing machines. AKTIEBOLAGET CRYPTOTENKIK. April 11, 1944, No. 6668. Convention date, May 3, 1943. [Class 100 (ii)] A number-printing machine is constructed with a larger space between the figures "9" and " 0 " of the numeral wheels 1, 2, 3, 4, 5, 6, Fig. 1, and the transfer mechanism is adapted to rotate the numeral wheels through a greater angle when changing from " 9 " to " 0 " than for other changes. The wheels can also be held in an intermediate position between the " 9 " and " 0 " so that noughts are not printed in front of the number being printed. The numeral wheels are mounted in a spring-raised sliding frame 8 which as it descends oscillates arms 21 in which are mounted the pawls 19a, 19b ... 19f , Fig. 3 (not shown), for advancing the wheels 1, 2, &c. The wheels are freely mounted on a shaft 7, and are set to positions in which they are held by a spring plunger 15 engaging recesses 14. The pawls are independently mounted on a hollow tube 20 carried by the arms 21, and normally only the units pawl 19a engages one of the ratchet teeth, as the other plaws have projections 26 engaging- the pawl of lower order so as to maintain the pawls 19b, 19c &c. from engaging their ratchets when the arms 21 return in clockwise direction after being swung counterclockwise. The ratchets have one long tooth 17 corresponding to the increased distance between the " 9 " and " 0 " numerals, and the units wheel has a deep tooth 18 which controls the change of the higher units. This transfer can take place however only when wheels 30, Fig. 6, attached to the ratchet of a wheel of lower order is in position in which a notched portion 31 permits the pawl, e.g. 19b, Fig. 6, to engage the ratchet of the higher order. The notches 32 are in positions corresponding to the deep tooth 18, and normally the wheels 30 prevent engagement of the pawls 19c, 19d with their ratchets when the pawl 19a engages the deep tooth, the pawl 19b of the tens wheels being actuated at each 10 movements of the units wheel. Means is provided for repeating a number an adjustable number of times from 2 to 4 times or indefinitely. To effect this an arm 47, Fig. 5, carried by a pawl 45, Fig. 1 and Fig. 4 (not shown), is caused to trip the action of the pawl 19a under control of a set of wheels 40, 41, 42, 43, 44, the teeth of which are engaged by the pawl 45 which is mounted on a shaft 46 carried by the tubular shaft 20. The wheel engaged by the pawl 45 rotates a distance of one tooth for each actuation of the arms 21, and only when the pawl 45 engages a deep tooth does the arm 47 free the pawl 19a, and the wheels 40, 41, are formed with different arrangements of teeth in accordance with the repeat desired. For an indefinite repeat no deep teeth are required as the pawl is held permanently in position to trip the pawl 19a. The angular movement a given to the arms 21, and the angle b subtended by the " 9 " and " 0 " positions on the numeral wheels is related to the angle c subtended by the distance between other consecutive numbers of the ratchet 16a, is arranged so that a is greater than ¢b + c. Also a is greater than b and less than 2c.