Patent GB-230803-A (GB)
Title: Apparatus for covering boxes or box blanks with wrappers or cover sheets
IPC: B31B15/00
Filed: 1925-02-12
Abstract: 230,803. Stokes & Smith Co., (Assignees of Federwitz, T. A., and Bailey, W. T.). March 13, 1924, [Convention date]. Apparatus for covering boxes or box-blanks with cover sheets comprises a machine for applying adhesive to the cover sheets, a machine for covering the boxes or boxblanks with the sheets, and an endless conveyer unit or mechanism which forms a bridge or connection between the two machines, receiving the sheets from the gumming- machine and advancing them to the box-covering machine; the conveyer unit may also simultaneously carry the boxes or box-blanks to the covering-machine. The conveyer unit is preferably self-contained so as to be capable of being detachably fitted to any covering-machine and as shown is fitted to a covering-machine W which is broadly of the type described in Specification 19966/01 and more specifically of the type described in Specification 249,967. The conveyer unit comprises sheet-conveying chains &c. 43 and box or blank-conveying chains &c. 91 intermittently actuated through a Geneva gear, the chains &c. 43 carrying gripping-mechanism actuated to grip or release a sheet when the chains are stationary and in timed relation to the machine W; the gripping-devices also eject the completed boxes from the machine W. The chains 43 are arranged around driving and idle sprockets on studs 33, 41, Figs. 6 and 7, carried in spaced housings 29, Fig. 3, mounted on slides 30 adjustable transversely of the apparatus to suit the size of the sheets &c. being conveyed, each driving- sprocket being adjustably connected to a spiral gear driven by gears on shafts 26, 27 carried by the housings and driven by spiral gears &c. from the Geneva gear 11. The chains are arranged over plates 29<a> and are supported thereon by rollers 43a, Fig. 14, carried by some of the links of the chains and the gripping-mechanism comprises a series of palms 56 and co-operating fingers 55 carried by the links; each palm projects from a member 45 forming part of a link and carrying a rotatable pin 47 to which is fixed the finger 55 and an arm 49 having a pin 50 engaging a slot in an arm 51 pivoted in the member 45. The arm 51 has a pair of lugs 53, 54 and a spring 52 disposed in a bore in the arm engages the pin 50 so that as the lug 53 or 54 is depressed, the arm 51 rotates and the spring 52 turns the shaft 47 and finger 55 to grip or release respectively a sheet a lying on the palm 56. The sheets are fed to the palms 56 with the forward edges contacting with stop edges 57 on the members 45 and the lugs 53 are depressed to grip a sheet as the chains advance by tripper bars 88 carried by links 87, 89 pivoted beneath the tops of the housings 29 and actuated by a lever 85 and links &c. from a rod 67 connected to a bell-crank lever 65 having a roller engaging a face cam in the pinion 9 of the Geneva gear; a similar bell-crank lever &c. actuates similar tripper bars at the delivery ends of the chains to depress the lugs 54 and release the sheet. The second set of chains 91 which convey the box-blanks or boxes are disposed in a plane parallel to and above the plane of the chains 43 and are carried by sprockets on studs 95, 101, the driving-sprockets being adjustably secured to spiral gears driven from the shafts 26, 27. The chains are supported by rollers carried by the box-engaging or pusher members 102 and running on plates 104 which have ledges 105 supporting the box-blanks etc.; the ledges, stop short over the platen of the box-covering machine so that the box or box-blank is deposited upon a cover-sheet beneath. The glueing machine G is of any suitable type, the cover-sheets a being taken from a pile, glued and then delivered by belts b, Fig. 4, to a belt h which runs between the belts b and delivers the sheets to the gripping- mechanism or the unit C; inclined bars 115 or rope belts guide the sheets from the belt h to the palms and top edges of the gripping-mechanism. The machine G and belts b, h are actuated from the main cam A of the box-covering machine W by a lug u carried by the cam and actuating a bell-crank lever y connected to the trip-lever a<1> of the machine G so that the latter gums and delivers a sheet while the unit C is at rest. The box-blanks &c. are delivered on to the chains 91 of the unit C by a belt 106.