Patent GB-1047354-A (GB)
IPC: G01G23/18
Abstract: 1,047,354. Selective printers. TOLEDO SCALE CORPORATION. March 3, 1964 [Aug. 23, 1963], No. 9012/64. Heading B6F. A weight recording machine, Fig. 1, is provided with a selective printer arranged in a housing 25 and comprising angularly displaceable type carriers 31, Fig. 10, a corresponding plurality of banks of keys 32, selectively operable for setting the type carriers 31 in a printing position, operation of any one key in a bank releasing any previously operated key in the said bank, the last-operated key being retained in the operated position and reset means operable after printing to reset said lastoperated key automatically. Type-wheel machines; power assisted key actions.-In operation, the ancillary information required with the weight recording is obtained by depressing the necessary keys 32, Fig. 7, one for each bank of keys, whereby the keys are locked in position by key collars 88, Fig. 5, engaging locking end 95 of a latch bar 89 and their corresponding key stems 91 are displaced to obturate the downward movement of a character selecting slide bar 117, associated with each type carrier, by co-operating with the appropriate one of stops 140 ... 149, which stops are associated with the character selected by the key 32. Subsequently, as a mechanism (not shown) makes a weight reading it initiates a printing cycle by rotating a shaft 42, Fig. 10, through one revolution the shaft carrying a cam 43 which drives a roller 44 so as to rock a square shaft 68 through linkage 56, 60, 62. The shaft 68 has fingers 136, Fig. 7, cooperating with stops 129 fast with the slides 117, which when the shaft is rocked counterclockwise move in a downward direction under the influence of springs 134 to set the typecarriers 31 in a printing position by means of Bowden cables 34, Figs. 10, 11. A slide 117 associated with a bank of keys in which none of the keys has been operated moves down with all the other slides under the action of the respective spring 134 and comes to rest when an abutment 140 engages the stop surface 139, whereby the thus set-up type carrier prints a " blank." Alignment for impression.-When the cam 43 reaches the position B, Fig. 11, a detent bar 80 drops into sector slots 82 of the type carriers 31, the bar being removed again when the cam 43 reaches the position C corresponding to the completion of impression. Resetting of type-sheets.-As soon as the cam 43, Fig. 11, falls away from the cam roller 44, Fig. 10, at point C the printing operation being completed by this time, a spring 73 rocks the square shaft 68 in a clockwise direction, Fig. 7, and the fingers 136 lift the slides 117 upwards, the slides coming to rest when stops 138 on the slides abut a fixed stop 139, and the typecarriers are reset to their original position through the intermediary of the Bowden cables 34, The resetting action of the spring 73 is controlled by an air dashpot 76. Keyboards.-The keyboard of the printer is provided with twelve detachable banks of keys 32, Fig. 1, the banks being accessible on removal of a front plate 114 and may be individually detached by removing screws 85, Fig. 7, holding the banks attached to a plate 86. Keys; sound deadening; coupling other machines.-The keys 32, Fig. 5, comprise stems 91, which are slidably mounted in aligned holes of a bracket 83 and a plate 84, intermediate of which each of the stems is provided with a collar 88 for co-operation with a latch bar 89. The keys are returned to their original position by springs 90 acting on the collars 88 and silent return is effected by the provision of a strip of felt 92 between the bracket 83 and collars 88. The keys 32 are also provided with brushes 106, Fig. 7, to provide an electrical read-out of the character selected and co-operate with a printed circuit (Fig. 2, not shown) on a board 107. Key interlocks; key actions for clearing of keyboard. The keys 32 of the keyboard, Fig. 1, are arranged in banks, each bank containing ten keys and each bank is also provided with a pivotally mounted latch bar 89, Fig. 5, whereby any key depressed can be locked in the depressed position by the collar 88 engaging the locking end 95 of the bar 89. Depression of any subsequent key results in the pivoting of the bar 89 whereby any previously depressed key is released and returned to its original position and the last-operated key retained in the operated position. After completion of a printing cycle the last-operated keys in the banks can be cleared either manually or automatically through the intermediary of reset arms 100, Fig. 7, associated with each latch bar 89 the arms 100 being pivoted by lateral displacement of a reset bar 150 having pins 151 co-operating with the arms 100. Automatic clearing of the keyboard after each printing cycle is effected by depression of an automatic reset key 163, Fig. 8, which is locked in its depressed position to disable a manual reset key 162. In operation, when the square shaft 68 is rocked to set the type-carriers 31 a reset finger 178 is pivoted downwardly therewith and rocks idly in a counter-clockwise direction a lever 169 pivotally mounted on a reset slide 167, whereby the finger 178 is received in a notch 176 of the lever 169. Following impression the finger 178 is returned to its home position by the square shaft 68, whereby the free end of the finger 178 catches on the surface 177 of the notch 176 in the lever 169 and lifts the latter and the slide 167 in opposition to a spring 171. This upward movement of the slide 167 causes a cam 175 (also Fig. 6, not shown) to engage a roller 159 on the lever 153 and pivot the lever so as to displace the square bar 150 and its pins 151 into engagement with the reset arms 100, Fig. 7, which in turn pivot the latch bars 89 to release and reset the lastoperated keys. Manual clearing of the keyboard is effected by depressing the manual reset key 162, which pivots a reset bar 89a to release the automatic reset key 163, the stem 166 pushing the lever 169 counter-clockwise out of reach of the automatic reset finger 178. Depression of a reset bar 161 causes the slide 167 to move upwardly under the influence of rollers 181 mounted on a bracket 180 and supported by the stems 164 of the reset bar 161. Simultaneous depression of both reset keys 162 and 163 is prevented by making the stems 165, 166 long enough so that if both are pushed in together they both engage the rocking lever 169 on respective sides of the pivot 168 and are thereby prevented by the lever 169 from being pushed far enough to be both caught and latched by the reset bar 89a. An interlock locking the key reset mechanism during printing comprises a bracket 160, Fig. 7, mounted on each slide 117 arranged to be moved adjacent the bifurcations of the reset arms 100 when the slides are in the downward positions.