Patent GB-906295-A (GB)
Title: Coded information reading apparatus
Filed: 1959-10-02
Abstract: 906,295. Sensing punched records; recognising characters. CUMMINS-CHICAGO CORPORATION. Oct. 2, 1959 [Oct. 20, 1958], No. 33441/59. Class 106 (1). Apparatus for sensing records e.g. cheques, Fig. 1, having data representations in either or both of two different codes has two corresponding sets of sensing means, means for feeding the cheques past both sets and means for rendering one or the other operative according to the code being used. The data is punched in the upper strip of the cheque, that on the left being represented in a single-column code having holes in any of five positions (positions " 1 " and " 6 " are blank). On the right the characters are represented by a three-column code which provides a legible pattern of holes. A line of holes 50 is used for feeding the cheque through the machine by means of a pin drum as described below. In the three-column code, there are six positions in each column and a seventh position in the third column. The significant positions of the character number only four, Fig. 2, and the seventh position c is a parity check bit which is introduced where necessary to make the number of significant holes always even. In the single-column code the characters are represented by holes in combinations of positions " 2 " to " 5 " a parity check hole being added in the seventh position to make the number of holes always even. The single-column coded data is preceded by a symbol " I " in the three-column code which sets the sensing means to read in the singlecolumn code. The three-column coded data is similarly preceded by a symbol " L " in the single-column code adapted to reset the sensing means. Pin type senser.-In the apparatus shown in Fig. 7 the cheques are fed singly from a stack by a friction roller 53 and forwarded by a belt 52 to a pin drum 51 the pins 51a of which engage the sprocket holes on the cheque as described in Specification 906,293 [Groups VIII and XIX]. Having passed a quarter arc round drum 51, the cheque passes to a second drum 52 which engages the cheque in the same way. The drums are rotated synchronously in steps by ratchet wheels which are engaged by a doubleended pawl 70 operated through lever 69 by a cam 68 on shaft 61 rotating under the control of a single revolution clutch actuated by a coil 66. Between the two drums there is a row of pins P2-P5 and P7. The pins are raised for the sensing operation by spring-loaded levers normally held down by a bail 76a on a lever 76 which is controlled by a cam on shaft 61. At a certain point in sensing cycle the pins rise, and where there is a hole they pass through so that the tips of corresponding levers 82a are released from abutments on the associated levers 79. The lower ends of those levers which have been released allow contacts S2-S5 and S7 to close. Later in the cycle the levers 79 are reset by lever 76 which at the same time, by means of a cam roller 85 spreads members 84 to reset the levers 82a. When a clutch coil 93a is energized a shaft 90 is driven through gears 91 from shaft 61, the ratio being such that shaft 90 makes a quarter turn for each turn of shaft 61. A cam 92 on shaft 90 operates six switches CS1, CS2, CS3, CSR. CSU and CSH. The switches CS1-CS3 are operated in turn during the sensing of the three columns of a character in the threecolumn code, corresponding to three revolutions of the shaft 61. In the fourth revolution switch CSR is closed to effect a reading operation and the switch CSU unlocks the circuit to allow the shaft 90 to return to the home position in which it is located by the operation of switch CSH. Circuit.-When a latching relay LR is in the position shown in Fig. 8 the apparatus is ready to sense data in the single-column code. Those contacts S2-S5 and S7 that are closed by the sensing of a column cause the corresponding relays R2-R5 and R7 to pick. The contacts of these relays are connected in a network 95 and provide a signal on one of a group of output terminals 1-9, o, +, -, and L. A signal on the " L " output terminal energized the coil of the latching relay which is thereby picked and latched in this position by arm 100. The apparatus is now set to read data in the threecolumn code. Closure of contacts LR6 causes energization of clutch coil 93a so that shaft 90 is coupled to shaft 61 as described above. The sensing contacts S2-S5 and S7 are connected to the supply B+ only by switches CS1, CS2 and CS3, contacts LR2-LR4 now being open. The switch CS1 energizes contacts S4 in the first column time, switch CS2 energized contacts S3 in second column time and switch CS3, contacts S2, S5 and S7 in third column time. By this means the array of points shown in Fig. 2 is sensed, the relays R2-R5 and R7 being picked in succeeding cycles. Upon closure of switch CSR network 95 again produces an output on one of the terminals 1-9, 0, +, - and I. At the end of the fourth cycle the homing switch CSH opens to de-energize the coil 66 and bring the shaft 61 to rest. When an " I " symbol is sensed the coil 102 is energized to release the latching relay and return the apparatus to the condition for sensing the singlecolumn code. If the cheque is missing and all the contacts S2-S5 and S7 close no output is produced by the network 95 nor is an output produced if none of the contacts close owing to the column over the sensing pins being blank. Photo-electric sensing.-Cheques from a stack 20, Fig. 9, are fed singly by friction roller 112 to a feeding band 114 against which the cheques are pressed by balls. The cheques are then taken by drum 115, the pins 115a engaging in the feed holes 50 and carried round an arc. A band 116 holds the cheque against the drum until it is delivered to a band 118 which takes it to an output hopper. As shown in Fig. 11 the feed drum 115 co-operates with an idle drum 122, there being a space between the drums through which light from a lamp 124 may fall on to the punched portion of the cheque and, passing through the holes, activate photo-cells in a sensing head 119. The inner face 119a of the head 119 has openings PC, Fig. 10, communicating with photo-cells. The openings have the same arrangement as the significant perforations of the three-column code indicated in Fig. 2, with the addition of positions 9 and 12 which are necessary for sensing the singlecolumn coded data. Further cells 130 and 131 are used to indicate when a cheque is passing through the sensing station. For the generation of timing pulses the drum is formed with two rings of holes 134, 136 through which light passes to photo-cells 135 and 138. The holes 136 correspond to the spacing of single-column characters and holes 134 to three-column characters. The latter are spaced at four-column intervals, there being a blank column between the threecolumn characters. The cheque is accurately located with reference to the timing holes by the pins 115a on the drum engaging the feed holes 50 in the cheque so that a pulse is generated from holes 134 each time a column is aligned with photo-cells in positions 2-5 and 7, Fig. 10, and from holes 136 when a threecolumn pattern is aligned with the three columns of photo-cell positions. Circuit.-A latching relay LR, Fig. 12, sets the circuit to read data in the single- or threecolumn code. In the released position contacts LRb and LRc connect photo-cells PC8 and PC10 to the amplifiers A8 and A10 while in the picked position photo-cells PC9 and PC12 are connected instead. Contact LRa selects the appropriate timing photo-cell 135 or 138. The timing pulses are used in gates G6, G8, G10, G15 and Gc to gate out the amplified signals from the photo-cells and apply them to a diode matrix 210 which delivers an output on one of the terminals " I," " L," " 1-9," "0," " + " or "-." If there is no cheque in the sensing station a signal is produced by photo-cell 130 which is inverted and used to block the timing pulses in gate 170. No output is produced therefore unless the cheque is present. A symbol " I " on the cheque (Fig. 1) in three-column code provides signals from photo-cells PC6 and PC10 and, via diode connections in the decoder 210, generates a pulse on terminal " I " to energize the coil 99 of latching relay. LR. This sets the apparatus to sense data in the singlecolumn code by transferring all the contacts LRa-LRc. After this data has been sensed the symbol " L " on the cheque, by energizing photo-cells PC15 and PCc, produces a pulse at terminal " L " which energizes the reset coil 102 of relay LR to restore the circuit to the original condition. The other photo-cell 131 produces a signal on terminal S (spacer) indicating that one cheque has passed and that subsequent data will be from the following cheque.