Patent GB-826179-A (GB)
Title: Paper box-making machine
IPC: B31B50/20
Filed: 1957-02-27
Abstract: 826,179. Making boxes. FOOD MACHINERY & CHEMICAL CORPORATION. Feb. 27, 1957 [March 28, 1956], No. 6622/57. Class 18. [Also in Group VIII] A box-making machine is provided with adjustable devices for cutting the corners of a cardboard or like blank, with means including a receiver for forcibly ejecting the cut corners in a prodetermined direction, and with means for folding the blank and for staying the corners of the folded blank. As shown in Fig. 1, scored blanks B arranged in a stack are adapted to be fed in succession to an operating station beneath a plunger 10 carried by a cross-head 11 supported for vertical reciprocating movement by the upper ends of slide rods 12. Disposal at the four corners of the machine are corner-cutting devices 15 to 18 and pressers for applying stay strips, supplied from stay rolls S, to the corners of the folded blanks. Each blank is fed by feed rollers 80, Fig. 4, and moved by a reciprocating pusher shaft 84 so that the front end of the blank engages a pair of stops 32. The front corners of the blank are cut concurrently followed by the concurrent folding and staying of the four corners. The stayed set-up boxes are delivered on to a conveyer belt 25. Each corner-cutting device comprises an upper knife holder 40, Fig. 6, in the form of an arm pivoted on a shaft 41 which includes an eccentric position, Fig. 6A. The knife holder has resiliently mounted thereon a pair of knives 45, 46 disposed at right angles to each other and co-operable with a pair of lower knives 51, 52 carried by a base 74. The base 74 also carries the knife holder and stay presser and is mounted on an adjustable corner block 73, Fig. 4. By rotating the eccentric shaft 41, the knife holder is adjusted along a line bisecting the right angle formed between the pair of knives 45, 46 and 51, 52. Each knife holder is actuated by means of a solenoid 58, Fig. 6, the operating plunger 60 of which is connected to the knife holder by means of a toggle joint comprising interconnected links 61, 64 normally biased to collapsed position by means of tension springs 67. The lower knife 52 is of channel-like construction to provide a recess for receiving an ejector tray 75. Each knife holder is provided with a slidably mounted spring-influenced spotting plunger 90 which is adapted to press the corner piece cut from a blank into the ejector tray. The corner piece is adapted to be forcibly ejected from the machine by the operation of trigger mechanism which moves the tray from the full-line position to the dotted-line position shown in Figs 3, and 5A. The trigger mechanism is operated by a reciprocating presser bar 95 which also controls the movement of the corner stay pressers. When the bar 95 moves in the direction of the arrow A, Figs. 3 and 5A, away from the plunger 10, it carries with it an operating post 96, Fig. 4, having a pin 98 which moves in a slot 99 in a lever 100 causing the latter to move in the direction of the arrow C about the axis of a vertical pivot shaft 101. As the lever 100 continues to move in the direction of the arrow C, it transmits its arcuate movement through a spring 103 and lever 106 to a lever arm 107 secured to the upper end of the shaft 101. The outer end of the lever arm 107 is provided with a slot 107a to receive a pin 110 projecting above the tray 75. As a result, the tray is moved to the full line position shown in Figs. 3 and 5A preparatory to receiving a cut-out corner from a blank B. The reset movement of the tray is against the bias of a spring 112 and a stop plunger 115, Fig. 4, is pushed upwardly by means of a spring 116 into the path of the lever arm 107 to lock the tray. After the corners have been cut from the blank, deposited in the tray and the knife holders returned to their raised position, the pressure bar 95 moves in the direction of the arrow B and the lever 100 is moved arcuately in the direction of the arrow D. As the lever 100 nears the end of its arcuate travel, the open end of a slot 100a therein passes round the lower end of the plunger 115 to depress it and cause its upper end to withdraw from engagement with the lever arm 107 thereby releasing the spring 112 which then exerts a trigger-like action on the tray 75 to move it to the dotted-line position with the lever-arm 107 engaging a stop 125, Fig. 5A. During the movement of the pressure bar 95 in the direction of the arrow B it operates the pressers to apply stay strips to the corners of the folded box. To prevent the accumulation of cardboard lint and dust in the recess of each lower knife 52, a blast of air is directed thereinto, when the tray 75 has been moved to the dotted-line position, by means of a nozzle 130 extending through the knife holder 40 and secured to tubing 131 which is connected to a source of compressed air. A wiring circuit, Fig. 7 (not shown), for the machine is arranged so that the corner -cutting devices can be operated only when the motor 144, Fig. 1, driving the pressers for the corner stay strips is running or when a switch 147, Fig. 1, is manually operated. U.S.A. Specification 728,086 (Reissue) is referred to.