Patent GB-191112582-A (GB)
Title: Improvements in or relating to Tabulator Mechanism for Typewriters.
Inventor: SPIRO CHARLES
IPC: B41J25/18
Filed: 1911-05-24
Granted: 1911-12-14
Abstract: 12,582. Spiro, C. May 24. Tabulating - mechanism; tabulating-key actions. -Relates to arrangements wherein column keys mounted on the carriage effect a variable shift of a stoprod carrying tabulating- stops having stop-noses at different levels. (1) The column-keys B are pivoted on a stud A<1> on the carriage A and engages a projection C' on a stop-rod C, which is secured to arms C<2> pivoted at C<3> to the carriage. The keys have different dips determined by engagement with the pivot C<3>, (2) The decimal keys H<1> operate a set of stopreeds H, which are slotted to pass over a guide-stud H<10> and are operated through levers H<3> and links H<8>. To facilitate assemblage, the levers H<3> are pivoted under the ordinary key-levers K on a slotted fulcrum-plate H<5>. The keys H<1> may be read by means of a rotatable bar L, which bears on the faces scales for use in tabulating money, tonnage, &c. The decimal-stop mechanism may be omitted. (3) The stops D are mounted by sockets on the rod C and are looked by engaging over the teeth of a rack C<5> secured to the rod, springs D<4> being provided for maintaining engagement. The stops have fingers D<3>, which may be used for setting the stops with direct reference to the paper, which for this purpose is bent over to bring the top edge on to the fingers. The stops are released by tilting them about the rod C by means of the fingers D", arms D<4X> being provided to limit the tilting movement. The stops are each formed with stop-noses D<5>, D<6>, the noses D<5> being at different levels and adapted to engage a stop-finger G<1> for column-selection. The noses D<6> are at the same level and are adapted to engage the stop-reeds H. (4) The rack C<5> may also carry stops J for use when tabulating by means of the keys H' alone, these stops having noses J<2> adapted to engage the stop-reeds H<1>. The stops each consist of a U-shaped member which can be sprung over the rack, and is formed with lugs to engage the top and bottom of the rack. (5) When a column-key B is depressed the carriage is released as described below, and the stop-rod C is raised to bring the nose D<5> of the selected stop to the level of the finger G<1>. the carriage then being moved under the control of the hand until arrested in the selected column. To permit accurate ' reverse ' tabnlation, the finger G<1> is pivoted at G<2> and may rock until arrested bv the engagement of the wall of a recess G<1> with the pivot-stud G'. The rocking movement is equal to the combined thickness of a nose D' and the finger, so that the carriage is arrested in the same position in both' reverse ' and ' direct ' tabulation. When the column position is reached, the column-key is released, and the decimal-position in the column is selected by one of the keys H<1>; or where the decimal stop mechanism is omitted, the decimal position is reached by means of the space-key or the back-space key. Carriage-releasing arrangements. - (1) The column keys B are adapted to engage a lateral arm on a bell-crank lever E<1> pivoted on the carriage and provided with a member, preferably the usual back-spacing rack E<3>, adapted to engage a lever connected to the escapementmechanism. The lever E<1> is provided with a carriage-release key E<2>. (2) The decimal-keys H' are connected to the member E<3> so as to effect carriage-release; or the margin-release key may be used for carriage-release. The margin-release key is arranged at the end of the bank of keys H<1>. Carriage brakes. - The brake consists of a toothed wheel M journaled on a pin M<1> and pressed frictionally against a stud M<8> by means of a spring M<2>. The pin M<1> is secured to an arm M<3> pivoted on a stud M<4> and formed with an arm M<5> which is connected by a spring M<6> to a bail N. The reeds H are shouldered to engage the bail N, so that when any key H' is depressed the wheel M is moved into engagement with the spring-drum wheel M', the spring M<6> forming a yielding connexion. The braking effect may be regulated by varying the pressure of the spring M<2> by means of the stud M<8>, the wheel M<1> being thick enough to mesh with the wheel M<7> in the adjusted position.