Patent Publication Number: US-4544368-A

Title: Case presenter apparatus and method

Description:
BACKGROUND OF THE INVENTION 
     The case presenter of this invention is designed to permit a single operator to perform the functions required by the case packer device disclosed in the co-pending U.S. patent application, Ser. No. 583,640 filed by Raymond A. Labombarde and Robert A. Tremblay. As explained in that application, in the prior art it has been necessary and customary to provide several operators to handle the production of a high speed folder-gluer such as manufactured by The International Paper Box Machine Company of Nashua, N.H. 
     The folded and glued box blanks delivered by the apron of a stacker in shingled formation has required the operators to travel back and forth between open corrugated cases, each carrying such number of box or tray flats as can be grasped without dropping and manually inserting the lift into the case until a layer is formed, and until the packing case is full. 
     The above mentioned case packer device permits a single operator to grasp an entire counted slug of folded glued flats, slide the slug onto a compression table, compress the slug and slide it bodily into an open corrugated packing case, held in a case gripper, which automatically turns the case back onto its bottom, closes the bottom flaps and discharges the case to a box taper. 
     To accomplish such efficient handling by a single operator, it is clear that the operator could not have a plurality of open, erected corrugated cases cluttering up the work area. Also, that the operator does not have time, or space, to repeatedly move around to the opposite side of the stacker apron to erect, or open, or position, a corrugated case ready for filling and then move back again to the near side to fill the case. 
     SUMMARY OF THIS INVENTION 
     It is for the above mentioned reasons that the invention of this application has been conceived, to enable a single operator to remain at one station, on one side of the packing apparatus and simply reach around, grasp, by the corners, a flat tubular corrugated case, presented at a convenient height, within easy reach, with the leading flaps open and overfolded. In one motion the inward pressure on the corners erects the case into an open tube so that it can be slidably inserted in the guides of the case gripper, for subsequent automatic handling by the case packer device while the operator can be grasping and sliding one or more slugs of flats into the open case. 
     Many more time delaying motions would be required of the operator, if it was necessary to pick a flat tubular corrugated case off a stack, attempt to overfold the four leading flaps with only two hands and hold them folded while erecting the tube and seeking to insert it in a case gripper. By having the leading flaps already overfolded, when each case is presented to the operator, the operators hand on one of the two corners,can hold the flaps open and folded as the case is erected and inserted in the case gripper. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1, is a top plan view; 
     FIG. 2, is a side elevation of the case presenter apparatus of the invention, in section on line 2--2 of FIG. 1; 
     FIG. 3, is a view similar to FIG. 2 showing the overfolding of the upper flaps; 
     FIG. 4, and FIG. 5 are similar views showing the overfolding of the lower flaps; 
     FIG. 6, is a similar view showing a flat in dotted lines, ready to be grasped by an operator; and 
     FIG. 7, is a perspective view of a flat, tubular, corrugated packing case. 
    
    
     DESCRIPTION OF A PREFERRED EMBODIMENT 
     As shown in the drawings, the case presenter apparatus 21 of the invention includes a main frame 22, mounted on wheels such as 23, for movement to a desired location 24, next to the operator station 25, for a single operator handling the operation of the case packer of the above mentioned U.S. patent application, Ser. No. 583,640, filed Feb. 27, 1984. A set of jacks such as 26 and 27 are provided for fixing the apparatus 21 at the correct location 24, within easy reach of the operator, on the floor 28, and for raising, or lowering, the apparatus to the correct height relative to the height of the operator, which is usually waist height. 
     Magazine means 29, includes the magazine 31, for holding a plurality of flat, tubular, corrugated cases 32 in a vertical stack 33, confined by the front wall 34, rear wall 35, and side wall 36, equal in height to the height of the stack, and a fourth, lower side wall 37 which enables a resupply of flat cases to be placed in the magazine 31 from the side. The walls 35, 36, and 37 are movable inwardly and outwardly, and clampable in position to hold flat cases of various dimensions as shown at 38 and 39. A gateway 41 is formed at the bottom of front wall 34, which will pass only one flat tubular corrugated case at a time, the bottom of the gateway 41 being formed by the longitudinally extending horizontal bars 42 and 43, which support the lower face 44 of each successive bottom most case 32 in the stack 33, as it advanced through the gateway 41 and along the horizontal path 45 toward the station 25. 
     As best shown in FIG. 7, each flat, tubular, corrugated case 32 includes leading upper major closure flap 46, leading upper minor closure flap 47 overlying leading lower major closure flap 48, and leading lower minor closure flap 49. It also includes corresponding major and minor side and end wall panels 51, 52, 53, and 54 and trailing upper and lower major and minor closure flaps 55, 56, 57, and 58 as well as leading upper and lower edges 59 and 61, and trailing upper and lower edges 62 and 63. Each case 32 is also of predetermined thickness of corrugated, so that when advancing along path 45 it is of double such thickness due to the overlying flaps and panels of each flat tubular case. 
     Bottom feed mechanism 64 is included in magazine means 29, the mechanism 64 comprising a pair of laterally spaced apart, longitudinally extending chains 65 and 66, trained around sprockets such as 67 and 68. The upper stretches 69 and 71 of chains 65 and 66 extend along the horizontal path 45 from in rear of magazine 31, along the bottom of the magazine, through gateway 41, through an upper flap folding zone 72, a lower flap folding zone 73 to the case presentation zone 74, alongside the operator station 25. Each sprocket 68 of each chain is rotatable on a shaft 75 journalled in bearings 76 and 77 supported on main frame 22, and each sprocket 67 is fastened on a shaft 78 journalled in bearings 79 and 81 supported on main frame 22. As shown in FIG. 1, shaft 78 is driven by a power train 82, from a motor 83, the motor being energized in response to the signals of sensing means 84. 
     A plurality of push lugs such as 85 and 86, are spaced around the chains 65 and 66, each arranged to engage the trailing edges 62 and 63 of the major and minor trailing flaps of each individual and successive bottom-most flat corrugated, tubular case 32, in magazine 31, and push the case through the gateway 41, and along the path 45, to the presentation zone 74, where it is halted by intercepting the beam from the photocell 87 of sensing means 84. The beam from photocell 87 is directed downwardly toward the upper face 88 of each case and the beam is reflected back therefrom to the cell to halt the bottom feed mechanism 64 until the operator has removed the case, whereupon absence of a case triggers the mechanism to respond by advancing the next successive bottom-most case in the stack 33. 
     The upper folding means 89 includes a plurality of upper folding hook assemblies such as 90, 91, and 92, pivotally mounted at 93, above path 45, in the upper flap folding zone 72, downstream from magazine 31, each upper folding hook assembly comprising an elongated straight element 94, pivoted at 95, intermediate of its length to an adjustable clamp 96 on main frame 22 to form a short arm 97 and a long arm 98. The short arm 97 includes a set screw 99, for varying the angle relative to the clamp 96, and the long arm includes an angular fold member 101, mounted at the end thereof and having a set screw 102 for adjustment of angle relative to long arm 98, and having a downwardly directed short element 103, constituting the upper fold hook of predetermined length of the invention. 
     The short element 103, includes a set screw 104, and is of predetermined length equal to the thickness of the corrugated material 105, so that it intercepts the leading edges 59 and 60 of the upper major closure flap 46, and upper minor closure flap 47, without intercepting the leading edges 61, of the lower leading major and minor closure flaps 48 and 49. Thus, the leading upper major and minor closure flaps are overfolded in upper folding zone 72, into open position and held in that position by upper hold down bars such as 106 and 107, which are mounted by clamps such as 108 and 109, on sub-frame 111. 
     Lower folding means 112, is provided in lower flap folding zone 73, comprising a plurality of lower folding hooks such as 113, 114, and 115, each pivoted as at 116, to a transverse shaft 117 mounted in blocks 118 and 119 arranged for longitudinal adjustment relative to main frame 22, so that the hooked portions such as 121, of each hook are correctly positioned to underfold the leading lower major and minor closure flaps 48 and 49 of each successive individual case 32, advanced through zone 73, along path 45. Limit arms 122, and 123, and a stop 124, limit the arc of movement of the lower folding hooks, there being a return spring 125, to return each hook to position after underfold of the lower flaps. 
     Lower hold down bars 126, 127, and 128 maintain the lower leading flaps in open, folded condition in the presentation station 25, ready for the operator to grasp the corners of the case, remove and erect it into a tube and insert it into the case gripper of a case packer device. 
     The lower folding means 112, is downstream of the upper folding means 89, and the upper folding means 89 preferably includes a hold down roller 130, extending laterally above the path 45, downstream of magazine 31, and upstream of the upper fold hook means 89. Roller 130, is journalled in bearings 134 and 135, each on an opposite side of main frame 22, the bearings being longitudinally movable to position the roller just in rear of the fold line 129 of the leading upper major and minor closure flaps as they are contacted and upfolded by the fold hooks 103. Thus, an exact fold on the fold line is assured by causing the flaps to first bow and then bend on the predetermined fold line. 
     The sub-frame 111 is pivoted at 131, to main frame 22, and connected at the front thereto by the quick release latch 132, so that it can be raised with the sensing means 84, control box 133, and upper hold down bars 106 and 107, and clamps 108 and 109 to give access to the fold hooks, adjustable gateway 41, and other parts for a new run of flat cases of different dimensions.