Patent GB-837111-A (GB)
Title: Improvements in storage devices with correction means
IPC: B41B25/24
Filed: 1956-12-29
Abstract: 837,111. Strip-perforating machines. DIRKS, G. Dec. 24, 1957 [Dec. 29, 1956], No. 39573/56. Class 100(3) Apparatus for correcting stored signals representing items corresponding to data items recorded sequentially comprises means for generating signals representing a corresponding subsidiary item as each data item is recorded, a subsidiary item storage device for registering said signals, means for indicating a recorded data item which is to be corrected, means for sending the recorded data items, means for rendering the signal generating, means responsive to the sensed data items and means for terminating said sequential sensing on detectors of the indicated item, whereby the registration of the storage device is corrected to correspond to data items recorded prior to the indicated item. A subsidiary item is defined as a numerical value not part of but associated with a data item to provide additional information relating to the item. In the production of lines of justified type by a line-composing machine or justifying typewriter, subsidiary items may be the character widths associated with the characters. In response to depression of keys 7, character signals are punched in the tape 43 by means of flip-flops 2<SP>1</SP>-2<SP>7</SP>, triodes 3<SP>1</SP>-3<SP>7</SP>, relays in units 4<SP>1</SP>-4<SP>7</SP>, and magnets in a punching unit 6. A motor 30 drives a shaft 29 carrying a drum 27 having a magnetic insert 34 and inserts 37<SP>1</SP>- 37<SP>n</SP> sensed by heads 33, 36. Operation of any relay in units 4 switches on a flipflop 31 and opens a gate 32, whereupon a signal from insert 34 switches on a flipflop 46 and opens a gate 35. A signal from insert 37<SP>1</SP> then ionizes a triode 38; causing operation of the selected punches and feed of the tape by a roller 55 released for rotation by a motor 57 by means of a magnet 51. All the inserts 37 are sensed before the triode 38 is de-energized, so that the latter is ionized only once for each key depression. After the setting of the flip-flops 2 by the key, signals from the inserts 37 are fed to the flip-flop 2<SP>1</SP>, and the flip-flops 2 then act as a counter, producing a signal on an output line 63 at a time depending on the setting of the flip-flops 2. This signal closes the gates 32, 35, leaving the flip-flops 2 in zero position, and switches on a flip-flop 64. Inserts 67<SP>1</SP>-71<SP>1</SP> in a drum 28 on the shaft 27 and coded to represent character width in binary form are sensed by heads 66<SP>1</SP>-66<SP>5</SP>. When the flip-flop 64 is switched on, gates 65<SP>1</SP>-65<SP>5</SP> are opened to admit a signal from a head 66 to flip-flops 24<SP>1</SP>-24<SP>5</SP> forming a binary counter; the signal sensed being from one line of inserts 67<SP>1</SP>-71<SP>1</SP> corresponding to the setting of flip-flops 2. The counter 24 is then returned to zero by a train of pulses from a vibrator 74 through a gate 73 controlled by the flip-flop 64 and a flip-flop 72. When the counter 24 reaches zero it produces a pulse on a line 77 to switch off the flip-flop 72. The pulses from the gate 73 are also fed to an amplifier 75 and to a counter 76 for character width from which the operator can see when the line is justifiable, and depresses an " end-of-line " key 103 to punch an " end-of-line signal. The depression of the key 103 also zeroizes the counter 76. If during the recording of a line an incorrect character is discovered, a back-space key. 105 is depressed repeatedly to bring the incorrect character back to punching position. A flip-flop 108 is switched on and activates a triode 109, whereupon a magnet 84 is energized to release a roller 78 for rotation by a motor 81 for one revolution in the opposite direction to the normal tape feed. The " erased " key 104 is then depressed, causing punching of the " erased " signal of a perforation in all seven code positions, through the flip-flops 2. In this case, the output pulse on line 63 is produced when insert 37<SP>1</SP> is sensed, and there are no inserts on the drum 28 on this line, so that no entry is made into the counter 76. A contact 104b is shifted, so that ionization of the triode 38 causes the roller 78, instead of the roller 55, to be continuously driven, by means of a flip-flop 113. A relay 40 is energized from the triode 38, whereupon a contact 40<SP>5</SP> opens to extinguish the triode 38, and a contact 40<SP>2</SP> closes to activate the sensing unit 6. The elements of the unit 6 are connected by a cable 92<SP>1-7</SP> to the flip-flops 2, which are thus set up as each character is sensed, the punches not operating because contacts 40<SP>3</SP> &c. in the units 4 are open. When the end-of-line signal before the line containing the incorrect character is sensed, the particular combination of energized relays in the units 4 completes a circuit to a relay 93 to open a contact 93<SP>8</SP> and stop the reverse tape feed. Contact 93b closes to zeroize the counter 76. Closing of contact 93<SP>3</SP> energizes a relay 96, and contact 96<SP>2</SP> then closes to activate the sensing unit 6, while contact 96<SP>6</SP> opens to break the connection to the punch magnets. The tape comes to rest at the character preceding the " end-of-line signal. Closing of contact 93<SP>9</SP> energizes the magnet 51 and starts forward tape feed. When the relay 96 is energized, the "end-of-line" signal is in sensing position, the flip-flops 2 are set to enter the width in the counter 76, and the tape is fed on, characters being thus sensed in turn and the widths. registered. When the " erased " code is reached, the setting of the relays in the units 4 completes a circuit to a relay 98, causing de-energization of all the correction relays. The remaining characters are all erased by depression of the key 104 and the "cancelled" key 110 simultaneously. Key 104 causes punching of the " erased " code, while the triode 38 causes feed of the tape. Recording of the required characters is then resumed.