Patent GB-1276160-A (GB)
Title: Automatic warehouse apparatus
Inventor: VLIET WILLIAM GEORGE VAN
IPC: B65G1/04
Filed: 1969-10-17
Abstract: 1276160 Automatic warehouse systems LUMMUS CO. 17 Oct 1969 [21 Oct 1968] 51109/69 Heading G4H Apparatus for automatically retrieving or depositing loads 23 in pre-selected storage spaces 24 in a warehouse comprises a support 12 containing a number of adjacent columns 1a-15a of storage spaces, a stacker 29 movable in a horizontal direction in front of the columns, a first circuit for supplying current signals of different carrier frequencies to the support, each column being identified by a different predetermined multi-element code signal comprising the signals of different carrier frequencies, a second circuit for providing a pre-selected one of the code signals corresponding to the column at which the stacker is to stop and a signal comparator 29a for comparing each code signal derived successively from the first circuit with the pre-selected code signal to move the stacker until the latter signals are identical. The stacker comprises a frame 34, 35 movable in a horizontal " X " direction by a motor 36, a carriage 40, movable in a vertical " Y " direction by a motor 37 and a chain 39 and a load-handling fork 43 movable in a " Z " direction by a motor 41. A conductor 49 divided into segments 1b-15b, each of which is associated with a different column is mounted adjacent the top of the support and a conductor 60 divided into segments 1-7, each of which is associated with a different row of the support, is mounted on the frame 34. Contact shoes 54a-54c which move with the frame and contact shoes 60a-60c or 60d-60f which move with the carriage are connected to the comparator 29a which consists of a remote computer. Continuous conductors 45-48 connect a central computer 70 to the stacker 29 via contact shoes 50-53, the central computer generating signals B, C, D, E of different carrier frequencies which are fed according to a four element Gray code to the segments 1b-15b, thus providing each segment with a different address code. The central computer also generates signals K, L, M which provide each segment of conductor 60 with a different address according to a three element Gray code. The " Z " movement of the fork 43 into and out of a storage space 24 is provided by signals generated by the central computer according to a two element Gray code. To enable the stacker to move a load from an initial storage space to a final storage space, a push-button control panel 71 is provided with a first array of switches (85a), Fig. 8 (not shown), selected ones of which corresponding to a digital number representing the initial address of the load are depressed. On depression also of a pick-up switch (77) an initial address signal is sent to the comparator 29a which also receives via the shoes 54a-54c and the shoes 60a-60c, the existing address of the stacker. Any difference in the two addresses causes the comparator to generate signals which are fed to the motors 36, 37, thus moving the carriage in the " X " and " Y " directions until its address is identical with the required initial address. The computer 70 also generates command signals such as A and J which indicate " X " and " Y " movements. On arrival of the carriage at the initial address green lights are illuminated on the panel 71. A command signal to move the fork into the storage space to pick up the load is then sent from the computer 70 to the comparator 29a. After the successful picking up of a load on the fork has been indicated on the control panel by the illumination of a lamp, selected switches of a second array of switches (85) corresponding to a digital number representing the final address of the load are depressed. A deposit switch (78) is also depressed and the comparator compares the initial and final addresses, thereby generating signals to drive the motors 36, 37 until the load is positioned at the final address. As the stacker moves, the shoes inductively co-operate with or conductively engage successive segments of the conductors 49, 60 to continuously supply the changing stacker address information to the comparator. Three shoes are provided for each contact to enable the carriage to be centrally positioned with respect to each storage space and to enable a slowing down of the movement of the carriage as it approaches its destiny. Errors in the operation of the apparatus are signalled to systems of lamps on the control panel by command signals generated in the stacker computer.