Patent GB-518388-A (GB)
Title: Improvements in apparatus for the assembly of folding blanks for cases
IPC: B27M3/36
Filed: 1938-08-23
Abstract: 518,388. Box-making machines. NO-NAIL CASES PROPRIETARY, Ltd., and KAMPER, A. M. Aug. 23, 1938, No. 24837. [Class 18] Box blanks of the kind in which panels 126, Fig. 2, forming the front, bottom, back and in some cases the lid are secured at opposite edges by two toothed binding strips 41, which may have flanges to locate the ends, are made by feeding two mild steel toothed strips on to a roller chain conveyer 33, Fig. 3, each alternate link of which carries a magnetic block 37; so that the strips are brought with their leading ends in contact with stop levers 98, Fig. 1, whereafter the magnets slip along the strips. Hand actuation of a lever 120, Fig. 11, de-energizes a solenoid 95, Figs. 1 and 8, and disengages conveyer clutch 93, and simultaneously causes members 50, 51, Figs. 1 and 2, to assume positions as indicated by dotted lines in Fig. 2 where they act to keep panels 126 fed by hand in desired spaced position, angle bars 42 locating the panels on the teeth of the strips in transverse direction. Thereafter press heads 47 drive the panels down till they are fully penetrated by the teeth, and thereafter rise as shown at the right and left respectively of Fig. 2. The stop levers 98 are then moved to permit the conveyer, which is again actuated, to discharge the blank, the points of the strip teeth being deflected inwards as they pass under deflectors 117 and the work being consolidated by rollers 81, 82. The press heads 47 and positioning members 50 are actuated when a'solenoid 74 is energized the motion being derived from a motor 76 through belts 77, lay shaft 78, sprocket 79, chain 80, sprocket 68, shaft 65 and the driving member of a clutch 66 of known type, the driven member 67, Fig. 9, of which has, pivoted on it, a trip member' 69. In disengaging the clutch and biased by a spring (not shown), into clutchengaged position shown in Fig. 9, trip member 69 co-operates with abutments 70, 71 on a lever .72 fixed to a shaft 73 rocked by the solenoid 74, so that the required intermittent rolling motion is given to a shaft 63 connected by a resilient shaft 62, which ensures uniformity of pressure in spite of varying thickness of the panels, to a roll shaft 54, Fig. 2, which by cranks 59 and connecting rods 60 actuate levers 61 fixed to first shafts 45 carrying the press heads. The stop levers 98 which have rollers 98A, are fixed to shafts 99 to which are keyed rigid lifting levers 102 pressed down by springs and engaged by a spring pawl 114 on press head shaft 45, so that the noses of stop levers 98 are lifted clear of the blank until they are retained by engagement of tail levers 104 under holding levers 105, pawls 114 finally disengaging upwardly and laterally from lifting arms 102. When the leading edge of the blank strikes trigger lever 107 rigid with holding lever 105, lifting lever 102 and with it the stop lever 98 are released but rollers 98A hold the stop levers clear of the blank by resting on the upper surface thereof, until lever 102 is re-positioned by pawl 114. The control mechanism, Fig. 11, includes a switch lever 120 which closes alternatively contacts 121, 122, the latter energizing solenoid 74 from a source 123 and the former connecting the source 123 to solenoid 95 through an interlocking switch 124 closed when the press heads are fully raised by a lever 125 on crank shaft 63. One of the conveyers and its runway are adjustable laterally for different widths of blank. Specification 470,257, [Group VII], is referred to.