Patent GB-706914-A (GB)
Title: Improvements in and relating to bread wrapping machinery
IPC: B65B11/10
Filed: 1950-09-26
Abstract: 706,914. Bread-wrapping machines WHITE & CO., Ltd., J., and DORTON, E. W. Dec. 21, 1951 [Sept. 26, 1950], No. 23561/50. Class 94 (1) A bread wrapping machine of the type having a bread receiving feed trolley movable from a bread receiving position to carry an unwrapped loaf to a position for discharge from the feed trolley to bread conveying means is characterised in that the bread receiving feed trolley when in the receiving position is disposed at one end of the machine and is movable in a direction towards the delivery end of the machine to an inner position in which a positioned loaf is discharged to a bread hoist at the commencement of the cycle of wrapping operation, the path of movement of the fully wrapped loaf towards the delivery end of the machine being in the same direction as the inward movement of the feed trolley. Article feed. A feed trolley 3 running on wheels 5, 6 which engage between them rails 7, is reciprocated from an outer loaf-receiving position to an inner position by an endless chain 18 running over a sprocket oscillated by camactuated lever and chain means. At the loafreceiving position rollers 12 on the outer edge of the trolley engage pivoted guide rail end extensions adjustable so that the trolley may assume horizontal position for manual feeding or a tilted position when the machine is used in conjunction with bread-slicing apparatus. Adjustable side plates 13 on the trolley are adapted to co-operate with the guide of the delivery plate of the slicing apparatus to allow automatic loaf feed to the trolley. When a loaf E is placed on the trolley a pressure plate 127. which extends between the guide plates 13, is pushed back against a spring, causing a pin 162 carried by a tappet bar 130 extending from said plate 127 to operate a microswitch 161 on the trolley. This causes a clutch to engage the drive from a continuously running motor to the operating mechanism of the machine. When the trolley reaches its innermost position a cam-operated lever engages the tappet bar 130 to move the plate 127 to push the loaf off the feed trolley 3 and, with a wrapper C brought thereadjacent, on to a bread hoist B in its lowest position, the hoist being slidable vertically on guides 40 by cam-operated lever means 41. Wrapper feed. A roll of wrapping material C is supported on freely rotatable rollers 47, 50 and the web passes under a feed roller 53 which is rotated intermittently by free wheel 61. The free wheel 61 is driven by a chain 62 oscillated by a cam-actuated lever 65, a pull-rod 122 connected to the lever 65 .moving a lever 164 to operate a brake band 163 to brake and release the rolier 50. The web then passes over a guide plate carried by the hoist B below its bread -supporting plate 37, and on to a fixed plate 59 below a platen D, the hoist B being then in its raised position. A blade 73 operated by the hoist severs a wrapper from the web as the hoist descends, the outer end of the wrapper being retained on the plate 59 by clamping means. The clamping means comprises spring- loaded brackets 74 pivoted to the platen D and having a roller 79 on a lower arm 77 adapted to co-operate with the plate 59 to hold the wrapper during the hoist descent, the braakets 74 being lifted when the hoist is in its upper position by an arm 76 engaging the plate 37 of the hoist. Wrapper folding. Adjustable side plates 80 are carried by the plate 37 of the hoist so that as the loaf is pushed from the trolley first endfolds g are formed in the wrapper. Spring- loaded guide members 84 are carried adjacent the entry end of the plates 80 on pivoted arms 86 moved outwardly as the hoist approaches its upper position so as to allow the discharge of the loaf, by pins 91 on the pivots engaging camsurfaces 92 on rods 93 depending from bars 95 adjustably carried by the machine frame. Spring- loaded folding plates 99 pivotally mounted on pins 98 mounted in brackets extending from the bars 95, engage the ends of the wrapping material as the hoist rises, to form upper end folds h, foot-plate extensions 100 of the Plates 99 pressing the wrapping material projecting outwardly from beneath the loaf against the hoist plate 37 to prepare for end folds k. The partially wrapped loaf is moved off the hoist on to the platen D by pusher plates 119 actuated by the rod 122. End folds i are formed by folding plates 101 which may be heated and final end folds k by ploughs 103 carried by the rods 95 above the platen D. The wrapped loaf is moved along a receiving platform 123 by the next loaf. Adjusting means. The bars 95 are adjusted to and from one another, to vary the distance between the folders for different lengths of loaf, by a feed screw 106 (not shown) of opposite handed thread at each end, rotated by a handle. Adjustment of the plates 80 on the hoist B is effected only when the hoist is in its upper position by the same means, the rods 93 entering holes in the plate extensions to couple the plates to the bars 95. The feed screw 106 is locked when the hoist is not in its raised position by a pawl moved by the hoist, engaging a sprocket wheel geared to the feed screw. Cams 110 operated by arms 113 lock the plates 80 to the hoist.