Patent GB-1136351-A (GB)
Title: Improved apparatus for handling articles
IPC: B65G17/06
Filed: 1965-12-10
Abstract: 1,136,351. Loading and unloading pallets. MATHEWS CONVEYER CO. Ltd. 10 Dec., 1965 [11 Dec., 1964], No. 52429/65. Headings B8A and B8C. Stacking articles on pallets; unstacking.- Pallets P (Fig. 1) are unloaded by a device 3, and transferred to a stack 225 from which they are fed to a station 15 where they are loaded by a device 8. In the form illustrated loaded pallets are delivered by a roller conveyer 1 to the unloading point 12 (Fig. 12) from which the stack is transferred by grippers 84 on a straddle truck 4 to a conveyer platform 5. All but the bottom layer of the stack is then lifted by the straddle truck so that the bottom layer can be carried away (see Conveying the articles below). At the pallet loading point articles A (Fig. 1) are batched in groups of 3 (see Conveying the articles below) and the batches are then transferred into an area 8. When limit switches detect that a layer has been completed in the area 8 a straddle truck similar to the straddle truck 4 (Fig. 12) raises the layer so that a further layer may be formed beneath it. When a further limit switch detects that a stack of the required height has been built up in this way the whole stack is transferred to a pallet at the station 15. A roller conveyer 16 then carries the loaded pallet away. Conveying and batching the articles.-The stack lifted from the pallet is lowered on to members 38 (Fig. 6) and, after the rest of the stack has been raised leaving the bottom layer, two sets of the members 38 are lowered so that the end row of articles is engaged by live rollers 30 which transfer the articles to a roller conveyer 6 (Fig. 1). The remaining rows of the bottom layer are similarly removed in turn by lowering the sets of members 38 in pairs. The articles to be loaded on to a pallet are deliveredby a roller conveyer 198 (Figs. 1 and 19) to abut against the end of a conveyer unit 195 (Fig. 19). The conveyer unit 195 can be lowered by a ram 199 so that articles from the conveyer 198 are carried by live rollers on the conveyer unit 195 until the leading article engages a stop 205 and limit switches indicate that three articles have entered the unit 195. The unit 195 is then raised about its pivot 197 so that the three articles clear the stop 205 and are carried by live rollers 202 to abut against a stop 211. The conveyer unit 195 is then lowered so that the articles are engaged by chains 213 which carry them into the stacking area 8 (Fig. 1). Stacking and unstacking pallets.-Unloaded pallets are delivered in the direction 227 (Fig. 30) on to a pair of spaced chains 230 by which they can be conveyed on to the loading point 15 (Fig. 1) if required. If a pallet delivered to the chains 230 is not immediately required for loading it is raised by a platform 244 into contact with a stack supported by latches (not shown) retracted temporarily by movement about shafts 237. A similar operation serves to lower the bottom pallet from the stack when there is no pallet on the chains 230 and a pallet is required for loading. The front of the stacking machine of Fig. 30 is open so that pallets may be introduced into or removed from the system. Controls and alarms; forming stacks of different sizes.-The completion of each operation in the system is detected by limit switches engaging the pallets or the articles and automatically are rotated by means of an air cylinder 52 via a spindle 42 so that the apertures in each plate alternately are brought into and out of register respectively to take delivery of and to effect discharge of the measured quantity of beads. initiating the next operation. A horn is sounded if the pallet store is empty or over-filled. The size of the stack formed at the stacking station 8 may be altered by switching in different limit switches to detect the height of the stack. Manual overrides are provided for each operation.