US689499A - Art of manufacturing square-bottom paper bags. - Google Patents

Description

No. 689,499. Patented Dec. 24, I901. W. A. LORENZ.

ART 0F MANUFACTURING SQUARE BOTTOM PAPER BAGS. (Application filed. my. 19, 1901.

(No Model.)

Fag. ,2. d B Fzgn. 10

mtnesses l five}: tor:

UNITED STATES PATENT OFFICE.

PAPER BAG MACHINE COMPANY,

OF PHILADELPHIA, PENNSYLVANIA,

A CORPORATION OF PENNSYLVANIA. I

ART OF MANUFACTURING SQUARE-BOTTOM PAPER BAGS.

SPECIFICATION forming part of Letters Patent No. 689,499, dated December 24, 1901. Application filed March 19, 1901. Serial No. 51,818. (No model.) I

To all whom it may concern:

Be it known that 1, WILLIAM A. LORENZ, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in the Art of Manufacturing Square-Bottom Paper Bags, of which the following is a full, clear, and exact specification. This invention relates to the art of manufacturing square-bottom paper bags; and it has for its object an improved method of forming the so-called diamond'fold in a bellows-sided or tucked tube or blank, such r5 method being adapted for use in connection with any well-known method of previously forming the tube or blank and of subse-.

quently pasting and folding the diamond to complete the bag.

My inve'ntiomhas more particularly for its object an improved method of opening out the open or bottom-forming end of the blank, so as to form the inside triangular folds in an easy and rapid manner.

My improved method includes as one of its features the engagement separately of the upper and lower plies of the tube-and then folding the same in opposite directions over and around adjacent folding edges, the dis tance from each of said pointsof engage- 'ment to the folding edges being primarily less than the depth of the tucks; Furthermore, after said plies have been folded back, so that the engagement-points have arrived in positions at opposite sides of the adjacent folding line'sor edges and substantially. at right angleswith the body of the blank at said lines, thedistance betweensaid points of engagement is increased until the tucked sides have been completely stretched out be tween them, so that finally the distance from said points to the folding-lines will be substantially equal to the depth of the tucks.

V One of the ordinary methods of forming the diamond on a bag-blank comprises the engage'ment of the upper and lower plies there- -of by suitable devices generally known as tuck and box holders at such points,-

of the tucks, so that as said points are separated said tucked sides will be gradually stretched out to develop the inside triangular folds. The method of straightening out the tucked'sides is usually carried out by swingsequently the distance between such points must be increased in order fully to stretch the tucked sides of the tube;

QFurthermore, my improved method comprises as one of its features the manipulation of the blank in the above manner, while the upper and lower plies are preferably maintained in close proximity to each other during the period when the distance between the box-holders and tuck-holders is increased 'to 'distend or stretch the tucked sides to-the required extent. Furthermore, I have found in practice that when theline of travel or movement of the box and tuck holders is substantially atvright angles with the body: of the blank while the tube plies are kept close together the inside triangular folds may be developed gradually and in an easy manner,

said folds maturing in the nature of a run ning fold during the distension of the tucked sides.

My improved method is clearly'illustrated in the accompanying drawingsfin which similar characters denote, similar parts, and in which- Figure 1 is a side view of a blank, illustrating the manner in which the blank plies are engaged by the several instrumentalities employed during the diamond-forming operathe distance of which from the bottom-defining line is substantially equal to the depth ing the devices which engage one ply of the been increased, but the sides have not been I fully distended; and Figs. 8 and'9's'howa side view and front view, respectively, of the blank 5 when the distance between the box-holders and tuck-holders is substantially equal to the depth of the tucked side, so that thelatteris completely stretched out and the inside triangular folds have been fully developed.

formingsection A,tl1e boundary-line between said sections being generally known as the defining-line and indicated in :the' present instance by (1 cl.

Referring to Figs. land'2, it will be seen I that the upper'p-ly-of the blank is engaged by the so-calledbox-holders B, which, in conjunction with grippersb,.serveto fold theup- L per ply 12 around the edge fof a member F,

which constitutes the folding member for the upper ply of the .blank,-whilea:sim=ilar nem- 5 her F, having an edge f, forms the folding lower ply is herein shown engaged by tuc'kholders '1, w hicheooperate with pincers tand F whereby said lower ply 13 is folded around the edge f, the positions .of the box-hoslders and tuck-holders B and T after performingi :member for-the'lower-ply 1 3 of theztube.

theirproper-fnnction in folding the respective plies around the folding edges f and f being clearly/shown in Fig. 4.

, .a distance from the defining-line olat equal to the-depth of'the .tncksa-nd that, furthermore, the folding edges ,7 and f are disposed between the points 15and said defining-line dd, 1 the position of the folding-linerelative to the defining line remaining substantially the same .as the plies of the tube are bent ou-tward from the position shown in Fig. ,1 to that j shown in Fig. 4, in which the plies of thetube are shown substantially at right angles with the bodyof the tube .at the folding-lines. In .thefu-rther manipulationof the blank the'boxholders and th ck-jholders are :movedi-n the di- 1 rection of the arrows 16 [and 17, respectively,

thereby drawing the plies over their respective folding edgesfand f, and thusgradually forming the inside triangular folds after passing'the intermediate position shown in Figs.

6 and 7 to that shown in Figs. 8 and 9,when the tucked tube sides have been fully distended or stretched to complete the box, which may then be transformed into thediamond. (Shown in dot-and-dash lines in Figs. 8 and 9.) V i I In the present case I have shown the fold- Figs. 6 and 7 movement of the box-holders and tuck-holders will produce a running fold in each of the tube plies over the edges f and f, while the In the drawings the blank 10 is shown as having tucked or bellows sides 11 andcomprising the bag-section A and the bottom-- closed position. 1

Having described my invention, what I claim as new,.and desire-tozsec-ure by Letters Patent, is-

1 Theimprovernent in the art of forminga diamond insquare-bottom paper bagsw hich comprises folding over the tube plies in opposite directions and between such points thereof, the distance of which from the primary folding l-ine is less than the depthof it-he tucks.

2. The improvement in theartof forming a diamond in square-bottom paper bags'whi'ch com-prises folding over the tubepliesfin-opposite directions and between such points thereof, the distanoeef which from the primary folding-line is less than thezdepthef the tucks, and increasing the distance between .saidpoin'ts until the tube sides areicompletely distended between them.

3. The improvement in the-artao'fforming a diamond of square-bottom paper bags which consists in the engagement-of the sides-of the Again referring to Fig. 1, it willbe seen that the points of engagement 15 are disposed at upperran-d lower tube plies at-points, thedistanceof which from the primaryfolding-line is less than the depthef the tucks, folding over both plies in .oppositedirectionsto positions, substantially to form right angles with the ,tube bodyat the folding-line, and sub sequent-1y increasing the distance between said points to'develop the inside triangular 4. The improvement in the art of forming the diamond of square --'bettoni paper bags which comprises'the engagement of tli'esides of the upper and lower tube plies at such points -thereof,-'thedistance of which fromthe primary folding-line is lessit'han the depthof the tucks, maintaining the tubeplies in closed condition, folding over both plies inopposite directions to positions substantially at right angles withithe tube-body-at thefoldingline, increasing the distance between .t-hepointsof engagement to develop :the inside triangular folds, and subsequentlycompleting the diamond.

5. The improvement in the art of forming the diamond of :square -2bo-ttom paper bags which consists in engaging the plies at such points thereof, thed-istance of which from the defining-line is equal to the depth of the tucks, distended between them and until the definfolding over said plies in opposite directions ing-line and the folding-line substantially 00-' at and around corresponding primary foldingincide.

lines located between the points of engage- WILLIAM A. LORENZ. 5 ment and the defining-line, and subsequently Witnesses:

increasing the distance between said points CHAS. F. SCHMELZ,

of engagement until the tucked sides are fully NELLIE PHOENIX.

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