Патент USA US2132546код для вставки
Oct. 11, 1938. E. L. sM‘rrH ' 4 2,132,546 TUGKING DEVICE FOR WRAPPING MACHINES Filed NOV. 4, 1936 _% a - v 37 I INVENTOR Zbvm Zara: 6mm )7; BY ' I ' *WM. ‘ITORNEYS Patented Oct. 11, 1938 - UNITED STATES PATENT OFFICE 2,132,546 TUCKING DEVICE FOR WRAPPING MACHINES Elmer Lovell Smith, Longmeadow, Mass., as signor to Package Machinery Company, Spring ?eld, Mass., a corporation of Massachusetts Application November 4, 1936, Serial No. 109,085 5 Claims. This invention relates to wrapping machines and more particularly to means for forming folds or tucks in the portion of the wrapper which extends beyond the ends of the article 5 after the latter has been partially enclosed in the wrapper. > In wrapping relatively thin articles, such as sticks of gum, it is customary after the wrapper has been carried around the article by means 10 of a tumble box, or equivalent devices, to fold the extending ends of the wrapper ?at against one face of the article without side tucks being formed in the end extensions. It has been found that with a fold of this character the flattening 15 of the tubular extension against the face of the article projects the folded ends beyond the sides of the article, interfering with the smooth appli cation of a label to the individual articles or to a stack of wrapped articles such as constitute 20 the usual gum package. To overcome this difficulty it has been found desirable to form a. tuck in at least one side of the tubular extensions before they are folded over onto the article so that the wrapper will 25 present a smooth surface on at least one side of the article or package of articles. Because of the thinness of articles such as gum sticks, and the speed at which wrapping machines of this character must be operated if 30 production costs are to be kept within accepta ble limits, the usual type of end folders or tuck ers cannot in practice be employed. It is the principal object of my invention to provide a tucking or end folding device which will operate 35 satisfactorily on thin articles such as sticks of gum and which can be incorporated with the wrapping instrumentalities heretofore used with out interference with the operation of the latter and without increasing the time of operation. In 40 accordance with the invention the folding device is mounted in the path of motion of the portion of the wrapper to be folded, and operates by allowing the wrapper to impinge upon it during the motion of the article. It is generally neces 45 sary to withdraw the folder from adjacency with the article to avoid interference with other parts of the wrapper; and this is conveniently done by giving the folder a motion, preferably of ro tation, synchronized with the motion of the ar 50 ticle and coordinated with the shape of the folder so that the form of fold desired will be made dur ing the withdrawal of the folder from the article rather than during its approach towards the ar ticle as in the usual case. In the accompanying drawing I have illus (Cl. 93——2) trated one embodiment of my invention in con nection with those parts of a conventional tum ble box type of gum wrapping machine, showing only such parts of the latter as are necessary to an understanding of the invention. 5 Fig. l is a side view showing a tumble box, transfer device and end folder according to my invention; ' Fig. 2 is a top plan view of the structure shown in Fig. 1, the tumble box being omitted; 10 Fig. 3 is a view looking from the left of Fig. 1. the tumble box being omitted; Fig. 4 is a fragmentary view similar to Fig. 1 with the end folder removed to show the relative positions of the tumble box, transfer device and 15 article at the start of the end folding operation; Fig. 5 is a plan view of the structure of Fig. 4 showing the end folders in‘ their position at the start of the folding operation; Fig. 6 is a view similar to Fig. 5 but showing 20 the position of the parts as the end fold is be ing completed; Fig. '7 is an end view of the partially wrapped article after the end fold has been completed; . Fig. 8 is a bottom view of the completely 25 wrapped article; ‘ Fig. 9 is a section of the folding member sub stantially on line 9—9 of Fig. 5; Fig. 10 is a modi?cation showing additional end folding members associated with the tum- 30 ble box; and Fig. 11 is a bottom view of a completely Wrapped article in the production of which the ' modi?cation of Fig. 10 has been employed. Referring to the drawing, l0 indicates frame 35 members of the wrapping machine which form the support for the various wrapping members and their operating means. As shown, these comprise a tumble box H and a ?ngered trans port device l2, both of conventional form, the 40 latter being given a generally circular or ellipti cal movement, as indicated by the arrow in Fig. 1, to transfer the partially wrapped articles from the tumble box into the folding channel I3 ,_ formed by top plate I4 and rails l5. 4° The end folders comprise ?ngers l6 pinned or otherwise secured to vertical shafts l'l jour naled in bearings I8 secured as by machine bolts I9 to a bracket 20 supported from the outer 50 frame member Ill. The lower ends of shafts I‘! are provided with bevel gears 2| engaging bevel gears 22 pinned to a horizontal shaft 23. Shaft 23 is journaled in a bearing 24, positioned be tween gears 22 and secured to bracket 20, and 55 2 2,182,546 ' extends through bearings formed in frame mem Intermediate the frame members In the shaft 23 is provided with an arm 25 pivotally connected to an arm 26 extending from a strap 21 engaged around an eccentric 28 mounted on a shaft 23. Collars 30 secured to shaft 29 keep the strap on the eccentric. Shaft 28 is constantly rotated by means of a sprocket 3i and chain 32 from a 10 source of power notrshown, in properly timed relation to the movements of the tumble box and the transport device. ‘ As will be obvious, rotation of shaft 29 will impart through eccentric 28 and linkage 28-25 15 an oscillating movement to shaft 23 which is transmitted through gears 22--2| and shafts I‘! to the ?ngers Hi to oscillate the latter between the full and dotted line positions of Fig. 2. The parts are timed so that when the ?rst fin 20 gers of the transport device i 2 are in the posi tion shown in Figs. 1, 2, 4, and 5, and are ready to transfer the partially wrapped article 35 from the tumble box, the ?ngers i6 are at their ex treme inward position as best shown in Figs. 25 2 and 5, and are positioned immediately in front of the extending tubular wrapper portions 36. The ?ngers 16 start their outward swing sub stantially simultaneously with the forward move ment- of the transport ?ngers. The speed of 30 shaft 29 and the character of the eccentric 28 are such that the forward movement of ?ngers I6 is slower than the forward movement im parted to the article by the transport device ‘with the result that ?ngers l6 engage the leading edge of the tubular wrapper extensions 36 and form a tuck or fold 31 therein. The fold 31 partakes of the character of a bellows fold due to the fact that while ?ngers I 6 are retreating before the advancing article they are also simul 40 taneously being drawn outwardly from the path of the wrapper. The forward and outward com ponents of the ?nger movements in the form shown have a resultant pivotal movement. I claim: ' 1. In bers l0. The desired folding operation is accomplished with 45 out in any way changing or altering the normal movement of the article and the fold is made more gradually and with less tendency to tear the wrapper thanvwould be the case if the fold ing members were stationary at the time the fold 50 was made or if the folders were moving to meet the article. The movement of the folder is co ordinated with its contour and cross-sectional shape so that the tuck desired will be formed easily and to the ?nal form desired while exert C1 (it ing the least ‘possible disturbing action upon the wrapper. After passing the folders I6 the tucked out standing end portions 36 are folded around against the face of the article as shown in Fig. 8 by any suitable folding means and it will be noted that due to the infold 31 the edge 38 of the wrapped article is smooth from end to end and without projecting portions such as appear at 39 at the untucked side. In some cases, particularly when the article is of substantial width, such as that shown at 4|! in Fig. 11, it is desirable to form tucks at both sides of the article. To accomplish this I place ?ngers 4| (Fig. 10) at the ends of the article re ceiving slots 42 of the tumble box which form a wrapping machine which includes means for advancing a partially wrapped article with a tubular portion of the wrapper extending outwardly from an end thereof transversely to‘ the direction of its movement, a folding member positioned to engage the leading side of said ex tending wrapper portion as the partially wrapped article is advanced, and means to'gradually with draw said folding member, transversely, from the l) path of the extending wrapper portion during the advance of the article while maintaining the moving member in contact with the wrapper to progressively form a fold therein as the member~ is withdrawn. 2. In a wrapping machine which includes means for advancing a partially wrapped article with a tubular portion of the wrapper extend ing outwardly from an end thereof transversely to the direction of its movement, a folding mem 20 ber positioned in the path of said extending tu bular portion of the wrapper as the article ad vances, and means to move the folding member to withdraw it from the path of- the extending portion of the wrapper during the continued ad vance of the article, a component of said with drawing movement being in the direction of ad vance of the article and having a slower speed _ in said direction than the speed of the article whereby the extending tubular portion of the 30 wrapper will be folded by said folding member during the withdrawing movement of the fold ing member. 3. In a wrapping machine which includes means for advancing a partially wrapped arti cle with a tubular portion of the wrapper ex~ tending outwardly from an end thereof trans versely to the direction.of its movement, a fold ing member pivotally mounted adjacent the path of movement of the article, and means to swing the folding member about its pivot from a po sition in the path of said extending wrap per portion to a position outside of said path, said pivotal movement of the member being in the direction of, and at a slower rate than, 45 the movement of the article whereby the so moving folder engages the leading edge of the extending wrapper portion to form a fold therein. 4. In a wrapping machine which includes a tumble box for receiving an article and wrapper to apply the wrapper about the article with a tubular portion of the wrapper extending out wardly from the ends thereof, relatively station ary folding members secured to the ends of the tumble box in position to form a fold in the edge of the extending wrapper portion seated in the tumble box, means for moving the partially wrapped article from the tumble box, movable folding members positioned to engage the lead ing sides of said extending wrapper portions as (1.’) the article is moved from the tumble box, and means to gradually withdraw said movable fold ing members, transversely, from the path of the extending wrapper portions during the advance of the article while maintaining the moving fold ing members in contact with the wrapper to progressively form a fold therein as the member is withdrawn. ' ii. In a wrapping machine which includes means for advancing a partially wrapped arti cle with a portion of the wrapper extending out the tucks 43 as the articles and wrappers are wardly therefrom transversely ‘to the direction seated in the slots. The tucks 31 in the wrapper of article 40 are made by folders i6 as previously of its movement, a folding member positioned to engage the leading side of said extending wrapper portion as the partially wrapped article 75 described. 2,182,548 is advanced, and means to withdraw said fold- in; member, transversely, from the path of the extending wrapper portion during the advance of the article while maintaining the moving 5 member in contact with the wrapper to form a fold therein as the member is withdrawn, the 3 contour and cross-sectional shape of the folder being so coordinated with its movement‘ that the fold will be formed progressively and without substantial disturbing force exerted on the wrap per. ELMER LOVELL SMITH.