Patent GB-716491-A (GB)
Title: Improvements in the coating of paper or like cartons with wax or like proofing material
IPC: B31B1/74
Filed: 1951-03-29
Abstract: Cartons are coated with wax or like proofing materials, by feeding them in succession, singly or in groups, firstly into a bath of molten wax, then to a draining station at which each carton, while arrested at that station, is continuously rotated at a speed sufficient to fling off surplus wax, and then to a delivery station. In the apparatus shown in Fig. 1, cartons 11, carried in pockets 13 on an intermittently-driven conveyer 12, are delivered in succession to a transfer station 17 and are there transferred by a reciprocating pusher 15 to a holder 16 arranged at the periphery of a rotable carrier member 14, which is driven intermittently, in timed relationship with the conveyer 12.  Each holder 16 has a spring catch 19, for retaining the carton in the holder, this being released by striking abutments at the loading and unloading stations, and is secured to a shaft rotatably mounted on a bracket 29.  This shaft is formed with a gear which engages a rack secured to a member 33, slidable on a shaft 34 secured in the bracket 29.  A roller 35, freely mounted on a stub shaft on the member 33, is arranged to engage a track 37 on a member 38 as the holder approaches the draining station 26, after having carried the carton through the wax bath 24.  The member 38 is pivoted at 39 and has a cam roller 41 arranged to engage a cam 42, which rotates once as the holder approaches the draining station, causing the arm 38 to make one complete oscillation; the movement thus given to the member 33 causes the holder 16 to rotate first in one direction and then in the other, by means of the rack-and-pinion connection.  Locking means are provided to hold the rack stationary at all other times.  The carrier member 14 then moves the holder 16 to a delivery station 23 where the carton is trans <FORM:0716491/III/1> <FORM:0716491/III/2> ferred by a reciprocating pusher 47 to a pivoted pocket 49 in an intermittently rotated transfer device 50 which delivers it to a conveyer 56, the pocket 49 being caused to pivot and deliver the carton in an upright position.  The cartons are removed in batches on to a cooling conveyer by a pusher 57.  In the modified form shown in Fig.5, batches of cartons 11 are transferred from a conveyer 68 to holders 62, which are rotatably mounted on the four sides of a frame 61, spring-pressed clamping bars 64 being meanwhile released by a member 67 acting on a rod 66.  The holders 62 are carried through a bath 63 by rotation of the frame 61, after which they arrive at a draining station at which they are caused to rotate rapidly by a driven clutch member 69, mounted on a pivoted housing 71, being brought into engagement with a clutch member 73 on the holder 62.  A heart-shaped cam 74, normally engaged by a spring plunger 75, is provided for returning the holder 62 to its correct position after spinning and locating it therein; the plunger 75 is withdrawn during the spinning operation.  The holder is then moved to the uppermost station, where the cartons are removed from the holders by fingers 76, and deposited on a pivoted member which transfers them to a delivery conveyer.