Patent GB-1188201-A (GB)
Title: Improvements in or relating to Article Sorting Systems
IPC: E04H3/04
Filed: 1967-02-23
Abstract: 1,188,201. Endless conveyers; roller conveyers. FMC CORP. 23 Feb., 1967 [25 Feb., 1966], No. 8592/67. Heading B8A. A system for sorting articles L in accordance with labels bearing visual data, comprises a plurality of article storage units 32, an operatorcarrier 30 movable to positions alongside the units 32, and having means for applying labels to selected articles, conveyer means 60 for advancing the labelled articles, means operable to enable the data on the labels to be viewed as the articles are advanced by the conveyer means, and means for discharging the articles at selected stations 71, 72, 73 . . . in accordance with the data on the labels. General description.-An operator standing on a platform 31 (Fig. 4), of a traversing elevator 48 sucoesisvely selects articles from storage racks 32 (Fig. 1) according to instructions on respective labels carried by a tape T (Fig. 8), viewed through a viewer screen 265. He places the articles successively on a rollerway 33 or 34 leading via a ball-bearing table to a rollerway 39 having a pusher 43. The latter aligns each article with a head 232 which is projected by a cylinder 243 to secure the appropriate label on the article. The articles then pass one by one on to forks 45, 46 from which they are picked up by respective platforms 47 on endless chains 117, 118 of the elevator 48. These deliver the articles to an endless conveyer 57 which feeds an endless conveyer 58 leading to a driven roller conveyer 60. The articles are thereby carried to a viewer 76 which is associated with electronic circuitry (Fig. 17) which controls pushers 312 at a series of discharge stations 71-75 of the conveyer 60. The arrangement is such that operation is effected of the pusher 312 of the station corresponding to the code on the label read at the viewer 76. The article then passes down a shoot 78 and is loaded manually in a road vehicle T-2, T-3 &c. In a modification, each shoot 78 is replaced by a further roller conveyer (480), (Figs. 18-20, not shown) leading to a loading station 475 at which the articles are manually loaded on to a pallet on a scissorstype lift table 486. The latter extends upwardly between the chains of an endless conveyer on to which the pallet is subsequently deposited for transit therefrom to a station at which it is loaded into a road vehicle by a fork lift truck. The elevator 48.-In order to prevent feed of an article on to the forks 45, 46, when a platform 47 is in an unsuitable position, a bar 282 carrying a series of stops 280 is raised by the de-energization of a solenoid 294 to form a stop on the end of the rollerway 39. The solenoid 294 is energized by a member 134 of the platform 47 engaging an actuator member (302), (Fig. 3A, not shown) of a switch SWC. The platform 47 each comprise a control bar 134 carrying T-shaped members 133, the horizontal elements of which form the load-supporting platform. Each platform is maintained horizontal by the action of control members 143, 144 (Fig. 6) which are rigid with one end of the bar 134 and engage oval guide channels 147, 148. A member 140 rigid with the other end of the bar 140 engages an oval guide channel 154. The platform 31 carries guide rollers 163, 164, 165 and is connected by lifting cables 170 to a hoist drum 171 driven by a reversible motor 173. Tho elevator is mounted by wheels 178, 179 (Fig. 6) to run on overhead rails 180, 181, under the action of a motor 192. The load carriers 47 discharge on to a roller conveyer 55 which is carried by the elevator frame. The article labelling device.-Tape T (Fig. 8) is fed from a container 225 between a presser shoe 23 and a heated plate 226 and around the upper edge of the latter so that each label L is peeled off the tape. A tape feed roller 222 is stopped when a feeler of a sensor unit 240 drops into a space between two labels. The label is then drawn by suction to face an opening in a plate 244 against which the article P is held by the pusher 43. A presser foot 232 is projected by compressed air cylinder and piston 243 to apply the label L on to the article P when the article engages a switch (SWA), (Fig. 10, not shown). A viewing screen 265 enables the operator to read the label, following the label engaged by the presser foot, by means of an optical system (Fig. 11, not shown). This enables the operator to select the next article from the storage racks (according to the label indicia) while the previous article is being labelled. The sorting conveyer 60.-At the station 76 the rollers of the conveyer are canted slightly so as to urge each article against a rail 402. A photo-transistor head 425 (Figs. 12 and 14) is mounted to scan the labels L successively through a window in the rail 402. The head is operative only in an interval defined by the passing of the loading edge of the article between photo-electric gates L1-G1 and L2- G2. A code on the label comprises clock indicia 426 and code indicia 428 these are scanned respectively by two pairs of photo transistors 440 and 442. The output of the latter is fed into a series of flip-flop circuits FF1-FF5 (Fig. 17) respective to the marks of the clock indicia. Thus the label code indicia is translated into settings of the circuits FF1-FF5 and the outputs of these are fed into a primary shift register R. When the package eclipses the gate L2-G2, information in register F is fed into a register store R.S. When the article reaches the first discharge station 71, its trailing edge restores the beam of a light gate P.C.1 respective to this station, and this causes the information in store R.S. to be fed into a Register 1. The code is compared by a comparison unit CoMP 1 and if the codes do not match that required for station 71, no diversion signal is produced. When the article reaches station 72 and its trailing edge restores P.C.2, the information is forwarded to Register 2 and so on. A diversion signal when produced causes operation of the associated diverter 400, to deflect the article to the associated shoot 78.