Patent GB-473851-A (GB)
Title: Improvements in or relating to apparatus for making cartons or containers
IPC: B31B5/74
Filed: 1936-04-25
Abstract: 473,851. Making cartons. RITCHIE, M. C., and RITCHIE, Ltd., M. C. April 25, 1936, No. 11837. [Classes 18 and 66] The base of a carton comprising a boxlike structure is formed by folding down the sides of the carton at one end and recessing or insetting the base, in a machine in which the carton carrying mandrels 6, Fig. 1, are mounted on an intermittently rotated wheel 5, and the folding and pressing operations are performed by cam-operated mechanisms. A carton is placed on a mandrel which has a spring loaded end, at station A or B, and at station C, an arm carrying a folding block 26 swings down past a gumming roller 29 and folds in and gums the trailing side of the carton end. The block 26 is either squareended or shaped to form a partial fold in the side wings of the carton. During the passage of the mandrel to station. D where a plunger 88 consolidates the folded base the leading side of the carton end is folded in by a fixed projection 44, the carton passes under twin gumming rollers 30, and the remaining upstanding sides are folded down by plough - shaped guides 46. At station E, a plunger 89 insets the base end and at station F, the finished carton is discharged into a basket 33 which takes the carton through a waxing chamber 32 and a drying chamber 66, and finally releases it on to a conveyer 67. The wheel 5 is duplicated on the opposite side of the machine and fixed on the common axle is a disc 3 with slots 4. This system is given a slight rotation each time a projection on a continuously rotating wheel coupled to the driving wheel 21 engages one of the slots 4. Accurate positioning of the disc 3 is obtained by a spring detent 35 which prevents backward rotation of the disc and a spring-controlled bell-crank lever which engages projections on the wheel 3 to prevent forward rotation, but which is released periodically by a cam from the drive. The folder 26 and plungers 88, 89 are actuated through links 9 ... 11 which are pivoted to a disc 8, the latter deriving a reciprocatory motion from the engagement of a lever thereon with an eccentric driven from the main shaft. The baskets 33 are carried on an endless chain which is intermittently moved from the main drive through an eccentric and levers 68, 70. The recessing plunger 89, Fig. 9, whose face may be embossed in a complementary manner to the folded base of the carton is moved forward by a slidable collar 49 connected to the link 11 through the medium of a spring 50, the inner end of which abuts against a peg 51 on the plunger. After the plunger has inset the base of the carton, the collar 49 slides further inwards and pushes a sliding frame 54 over pincer-like jaws 52, to cause the latter to grip the peripheral edges of the recessed base. To prevent buckling of the carton during the recessing operation, the sides are supported by plates 56 which are moved inwards by sliding bars 58, 59, the latter being actuated by the link 11 through the intermediary of a system of levers and a friction clutch. In a modification, pressing station D is omitted and the mandrels carry spring-loaded collapsable ends which by means of a cam-surface are protruded at stations A, B, C and are retracted at the other stations. The camsurface can be modified by the operator so that the end of a mandrel is also retracted at station C to prevent the mandrel being gummed should a carton not have been placed thereon at station A or B. The recessing plunger is actuated by a pinion which is oscillated by the link 11 and the plunger carries four spaced side members which, with the end of the plunger, define a rubber-lined space to receive the "foot" or "stand" formed on the base of the carton during the recessing operation. According to the Provisional Specification, the folding block on the arm 26 is replaced by a roller.