US1770972A - Paper-bag bottomer - Google Patents

Description

July 22, 1930.

A} c. coTY AL PAPER BAG BOTTOMER Filed May 17, 1928 9 Sheets-Sheet 1 ATTORNEY.

July 22,1930. A, C, can ET AL 1,770,972

PAPER BAG BOTTOMER Filed May 17. 1928 9 Shets-Sheet 2 July 22, .1930. A} c, cow ET AL PAPER BAG BOTTOMER Fi Ied May 17, 1928 9 Sheets-Sheqt 3 INVENTOR ATTORNEY.

July 22, 1930. A, co-rY ET AL 1,770,972

PAPER BAG BOTfrOMER Filed May-17,1928 9 Sheets-Shget 4 ly 1930. A. c. COTY ET AL 1,770,972

' PAPER BAG BOTTOMER Filed May 17, 1928 9 Sheets-Sheet 5 0 w Q 4 m m N E O Q n W A 0. H vl1ll 0- 11 O O A J z Y gm w v B Y a k\/\ I. :1! %W .1. I \R ill. h w E i HHHHHHH IR HHMH I -11 w m \W x L R l rli4\ vl M I m I m m 58% NR 1% R m r W \J y 1930. A. c; coTY El AL 1,

I PAPER BAG BOTTOMER Filed May 17, 1928 9 Sheets-Sheet 6 I B 4 4 I M WU ATTORNEY July 22', 1930. A, .g, Y ET AL 1,770,972

PAPER BAG BOTTOMER Filed May 17, 1928 9 Sheets-Sheet 7 1 m INVENTORS ATTORNEY.

July 22, 1930; A COTY ET AL 1,770,972

PAPER BAG BOTTOMER Filed May 17, 1928 9 Sheets-Sheet 9- INVENTOR5 VATTORNEY Patented July 22, 1930 UNITED STATES PATENT OFFICE ALFRED CLEMENT COTY AND THOMAS EARL COTY, F WATERTOWN, NEW YORK' PAPER-BAG BOTTOMER Application filed May 17,

Our present invention relates to the paper bag industry and especially to machines for forming the bottom upon paper bags, for which reason we have called'it a paper bag bottomer. While it is adapted to the manufacture of bags of various sizes, such as may be required in many industries, it is particularly suited to the handling of large bags made of heavy material, such asthose used for cement and flour, in which it is very desirable to have the bottom of the bags formed so as to, prevent leakage. While machineshave been-on the market for that purpose, we believe that our device has substantial advantages over those known to us.

In themanufacture of the larger bags, a

system has been increasingly'employed in" which the tube is formed from paperand the, bags cut ofi to an appropriate len th therefrom in a single machine; these are t en stacked in a magazine of'another machine, and by some feeding device are fed into the other machine for the purpose of forming the bottoms. A feeding device for bags of the character described is shown in our Letters Patent 1,668,761, issued May 8, 1928; we have embodied a feeder of that type in the present machine for forming the bottoms. In our present machine, therefore, blanks of a desired length are stacked in' a magazine at one end of the machine, and are then fed into it for forming the bottom. In general, this operation of forming the bottom is performed in a Way common in this art, that is, the thumb-notch and projecting .tab caused by the formation of the thumb-notch are al-' ready embodied in the bag-blanks, and after a blank has been selected from the magazine and fed into the present machine, slits are then cut at appropriate points in the material. The end of the bag is opened and the sides folded in, after which paste is applied and the two flaps are folded over and pressed into place. Of course, this system of operation is old and Well-known in many forms of machines, and our improvements consist in means for performing these operationswhich are new inthemselves so far aswe are advised, and effect-the operation.

with greatspeed and accuracy. In machines 1923. Serial No. 278,459.

which we have built; and operated in prac tice, the feeds are greater than any with which we are acquainted. The quarter-barrel size of the machine, making a bag from 16 inches to 40 inches longand from 12 to 20 inches wide, can be run to turn out 150 bags per minute, the speed which we guarantee to purchasers being 125- per minute for all-day output.

The novel features of our new machine we will point out particularly in the claims, but briefly they are as follows g- We employtwo independent creasers to form the necessary creases on the bottom of the bag instead of using two creasers upon 6 a single cylinder, as has been frequently done heretofore; the timing of this device is such that the creases are formed consecutively at an appropriate distance apart, and this prevents puckering of the rather stiff paper employed in the larger bags. feature of this device we have a notch-roll of diameter an aliquot part. of that of the sweep of the blade, whereby the notch in one of these creaser rolls makes-two revolu- 7 tions for every stroke of the creaser; we thus get an added clearance, which is desirable for the high speed of. the machine.

Another important feature is the use of a large cylinder for folding, and placing a plurality of sets of folding mechanisms, hereinafter called the folding arms, upon the Inside of the cylinder,'so that instead of, pressing the bag inward against the outer periphery of the cylinder, the arms act to press the folds of the bag from the inside.- toward the outside, so that the folds are pressed against the fabric of the bag itself, means being employed to hold the bag under tension so as to afford sufiicient resistance. By doing this We obtain with highdelivery speed a relatively slow speed of the folding arms,'so that the flaps are not snapped over after the paste is applied with so much speed, as is the case in former machines, thus preventing the spattering of paste; while any paste that may be thrown lodges against the bag itself on the inside, where it will be covered b the flap after. the latter is folded over. These folding arms employ two move- As another and claimed in our parallel pending application No. 723,031, filed June 28, 1924. The

arrangement is one of relatively long period,-

since while the bag is being carried forward by the cylinder the arm may be pressing upon the flap until the cam releases the arm after a period of approximately 120 degrees of cylinder revolution.

' Another feature is the employment of clouble stationary cams with a cam-roller mounted upon the outer periphery of the cam to give the movement of translation of the folding arm referred to, and another cam roller moving in a groove in the face of the cam to give the movement of pressure for holding the flap down until the paste is set.

Another feature is the use of a plurality of folding arms in the large cylinder referred to, so that the cylinder may be run at a moderate speed, and yet the output will be large because of the duplication or multiplication of these devices.

Another feature of improvement lies in an automatic stopping device by means of which the' absence of a bag from a selected part of the machine will release a detent and bring into action means for stopping the machine, so as to prevent piling up of defective and mutilated bag blanks, and, throwing the operations out of their proper sequence. This device shifts the belt on the machine from the fast to the loose pulley and may apply a brake, if desired.

Another improvement lies in means for dropping the paste-pad out of registry with the bag at the same time that the machine stops, so that paste will not be applied to any blank which happens to be fed into the machine; it being obvious that a large and heavy machine cannot be stopped instantaneously by any device without danger. This prevents spoiling of bag blanks, which are too costly to be wasted. When the machine is running properly, the paste-pad resumes its usual position in registry with -the bag on its opposing roll. 4

Another feature is the provision of ironing rollers at the exit of the machine by means of which any crinkling or creasing of the bags is straightened out before they are delivered to the boxes.

The accompanying drawings show one embodiment of the invention.

Figure 1 is a side elevation of a complete machine, some parts of the gearing being omitted for clearness.

Figure 2 shows the gearing of the parts shown in Figure 1.

Figure 3 is an enlarged side elevation, partly in section, of some of the parts shown in Figure 1, with some of the parts omitted for clearness.

Figure 4 is another enlarged side-elevation, partly in section, of the mechanism shown in Figure 3, but in a different position.

Figure 5 is an end elevation of some of the parts shown in Figure 3.

Figure 6 is an enlarged detail of the meclr anism for shifting the belt from the fast to the loose pulley, which is operated by parts shown also in Figure 5.

Figures 7 to 10 are enlarged details of the" paste-pad thrown off, operated in conjunction with the mechanism for stopping the machine automatically when a bag is not in its proper place in sequence.

Figure 8 is a perspective sketch of the mechanism for dropping the paste-pad at the time when the machine is stopped.

Figure 1-1 is a side-elevation, partly in section, and upon a larger scale, of the folding mechanism for folding the flaps at the bottom of the bag.

Figure 12 is an enlarged detail of one of the folding arms shown in Figure 11, being upon the line 11-11 of Figure 13.

Figure 13 is a plan view of the folding mechanism shown in Figures 11 to 16, and of the ironing mechanism for smoothing out creases in the paper of the bag, shown in Figure 11.

Figure 14 is an end elevation, partly in section upon the line li -14 of Figure 11, of the folding mechanism shown in Figure 13.

Figures 15 and 16 are side elevations partly in section of the folding mechanism shown in Figures 11, 13 and 14, in more advanced positions.

Figures 17 to 19 are perspective sketches showing the end of the bag in various stages of manufacture.

In Figures 1 and 2, A is the frame of the machine provided with a central extension A and a second extension A on the right, and brackets A and A, which carry parts of the apparatus. It will be understooclthat the frame is so cast for convenience and that the arrangements may be varied. The frame is,

as indicated, of heavy cast iron and is provided with flanges-for stiffening, so .as to form a firm support for the various mechanisms, which are rotated at high speed and necessarily subjected to some strain. Bis a magazine containing a pile of blanks C These blanks have been previously formed in a tuber and out off to suitable lengths, after which they are assembled in proper order in the magazine, At various points in the machine single blanks C, C, are shown under operation. To insert a blank in the machine a feeding device, such as is shown in our Letters Patent 1,668,? 61, dated May S, 1928, is employed, which is indicated only diagrammatically in Figures 1 and 2 and is shown in a little more detail in Figure 3. This bears the reference character D. There seems to be no necessity for describing this more fully,

to. This is operated by the gear D provided with adjustments so as to alter the timing of the feeding device as may be required,

which is shown in Figures 1 and 2. As this is not the subject of any claim in this application no further description of it will be given. After leaving the feeding device, as seen best in Figure 3, thebag-blank passes between the feeding rollers E, E F, G (more fully described later) and is engaged by the belt or tape Z, running between the rolls H and G. The bag is carried by the belt over the supporting roll H around the roll K which it will be seen is provided with a notch into which the creaser-blade K enters for. forming the first or rearmost crease in the bottom of the bag, after which it passes up between the roll K and a second creaser-blade K, which forms a second crease in the bag, turning the flaps up at a substantial angle to the bagin the well-known way. The bag is then engaged between the sets of belts Z, Z one of which, the belt Z, passes around the roll L;- thence aroundthe'c .linder M, which carries the folding blades or the opposing flaps ofv the bag, then passes out of the machine through the ironing roller N, presently to be described. The belt Z passes around the roll L the roll L and the roll L back to the roll L while the belt or tape Z passes from the bottoming cylinder M around the roll L* and roll L back to the roll L'. It will be understood that these belts or tapes as are in sets which engage with the side edges of the bag so that the central part of the bag which carries the flaps ofthe bottom is held under a tension against which the folding devices act, as presently to be explained more fully. It will be observed that the rolls L and L at the bottom and top of the machine respectively are carried upon swin ing links centered upon'the shafts of the ro l respectively. These are tension devices of well-known form, and may be operated by springs or otherwise, as may be desired. I In passing under the roll K'-, with which the creaser-blade K for the first crease operates, the bag-bottom passes over the roll I, which, as more fully explained presently, carries the shoe or ad I which stamps paste upon the flaps. is roll I cooperates with the roll J, which runs in the tank J ,0011- taining the paste, the roller J smoothing out 55 the paste on the roller J and removing any excess therefrom. .The reference letter N in Figure 1, applied to the bracket A of the frame, is intended to refer to the ironing rollers as a whole, presently more fully explained. At the bottom of the drawings is shown the shaft C, carrying handles 0, O which is a belt-shifting arrangement.-

Figure 2 shows the gearing by which the operation of the various parts is effected, a .65 pulley 1 receiving power from a belt 2 to drive the central shaft. The various gears are designated by the letters applied tothe rolls which they operate, and their directions of rotation are sufficiently indicated by the arrows. As all this is well understood by designers of these machines, no further description is. necessary.

eral course of the bag through the machine,

and indicate the various operations, without being exhaustively descriptive.

Turning now to Figure 3, we show the parts of the machine which operate before the folding cylinder M acts, on a somewhat larger scale and in more detail. In this figuretheletters are as before, the selector D for drawing out the bag from the bottom of the stack C being shown in the same manner as in our Letters-Patent 1,668,761, issued May 8,1928. This will not be further described, except to say that the blades d, d, are thrust in beneath the pile of ba -blanks'G and depress one of the blanfis C as shown here towards the rollers E, E the bag-blanks enga e with a hook e carried on an arm 6 of a bell-crank, the other arm whereof is brought under tension by a spring 6 forcing a cam-roller contained thereon against a stationary cam E gage the bag against the surface of thef'oll The timing is such that. the bag is-held by the hook e, which movesup under the control of the cam so as toen- E, and is-then carried-down against a guide E When the ha is engaged betweefi 'the rolls E, E the hoo e is released as its camroller descends from the high point of the cam. The roll F carries properly spaced slitting-knives, commonly used in these ma chines to form slits which enable the bottom of the bag to be turned in; by the folding mechanism. These are old and well known.

Passing over the guide E, the bag then proceeds between the rolls F, G. Centeredv on the shaft of the roll F are two cams F F; F is stationary, F revolves with the shaft (see also Figures 4 and 5). The cam F operates the pins f by means of a bell-crank f; one arm i carries the cam-roller f to 00- operate with the cam F The timing of this cam is such that as the bag C enters between the rolls F, G, the pins f engage the upper layer of the paper, while on the roll G a gripping finger G engages the tab on the lower layer about on the center line of the roller, and the pins i also pierce the web about on that line. As the rolls revolve the walls are pulled'apart the proper distance. The pins then release the up er wall, allowing it to drop upon a finger f, operated by means of the link F which works one arm of the bell-crank F centered on the shaftv 7; F is operated by a cam-roller f" operating by the cam F which is also shown in dotted lines. The cam F may be adjusted by the usual slot and bolt F to give correct timing. The arm or finger F is then pressed down as shown in dotted line position to follow the upper web of the bag by means of the roller f operating on the cam F the arm holding open the bag until the finger Gr engages, and then being withdrawn entirely out of the way to avoid danger of tearing the bag. The office of the finger F is to hold up the upper flap of the bag-bottom until about the time that the roller g, travelling on the cam G lifts the hook G to release the lower flap as it enters between the rolls G and H, at which time the upper flap slides off the finger F which then returns to its position shown in solid lines, ready for the next bag. Upon the roll G we have provided an arrangement by which the machine will be immediately stopped if the bag does not maintain its position or if no bag is fed through to the roll. The stationary cam G lS-COIII posed of two parts, Gr indicating another parallel disk or piece of metal (see the end elevation in Figure 5) having ahigh point corresponding to that of the other part of the cam. The two may be moved relatively to adjust the position at which the high point of the cam comes into action, and may then be locked in position by the bolt 9 This cam 0 erates a bell-crank lever G having an arm a roller 9 operates the arm of the bell crank as it rotates around the cam G toraise and lower the arm or finger G Another cam G is also provided with which the cam button 9 on the lever G operates. The

lever G is centered at g and is also a bellerank, the other arm of which is connected to a pin g (see also Figure 5). Tripping mechanism is centered at G, consisting of a lever Gr attached to a rod through a link G This lever Gr is held against the hub of the cam G and ordinarily is out action. The lever Gr is provided with a toe g and is pivoted at 9 as already stated.

The operation of these parts is as follows:

When a bag, carried between the rolls F and G, is engaged by the gripping finger G, it is under tension and presses down on the pin 9 (see also Figure 5). That holds the hook g on the end" of the lever G out of contact or registry with the point of the lever G, and as long as the bag is thus present to hold down the pin the machine continues to operate. If, however, no bag should be fed into the machine, then the pin g projects beyond the periphery of the cylinder G; the hook g drops and engages with the lever G, swinging it around its cent-er and lifting the link G to throw the machine out of gear. Of course, if desired, there may be a brake operated by this apparatus, but we have not deemed it necessary to illustrate or describe that, because such devices are well known. The bag, as already indicated, now passes out from between the rolls Gr andF "to belt Z and rolls H H and on to the point where the paste is applied to it. It then passes between the paste-pad 1 more fully described in connection with Figure 4, and up between the roll K carrying the notch and the first creaser-blade K. It will be observed from the positions of the blades that the actions of the two creaser-blades are consecutive and not simultaneous, as we have found by this action there is less tendency to crumple the bag and cause it to move out of the plane of operation. It then passes on between the rolls K and belt Z while the second creaser-blade K comes into co-action with notch 70 in the roll K It will be seen that the diameter of the roll K is an aliquot part of that of the roll K in this case onehalf, so that the roll K makes two revolutions for every revolution of the creaserblade K thus presenting the notch 70 twice for every revolution of blade K at one time the blade registering with the notch and at its other appearance the blade being 180 away; by this arrangement we et sharper entrance and exit, with better 0 earance; The same arrangement may be used. with the blade K, if desired.

Turning now to Figure 4 we'show some of the same, parts as shown in Figure 3, but in somewhat different position. In this case there is no bag between the rolls F and G; the ping has been projected beyond the periphery of the roll'G, the arm Gr has descended until the hook g engages with the lever G. The further progress of the roll G presses on the lever, which is pivoted at G, and raises the link G in order to throw the belt and stop the machine. A cam-button carried upon the arm G is operated by the stationary cam G and withdraws the hook g when'the high part of the cam G is reached. It will be obvious that this action does not restore the belt to the fast pulley, however, as will be apparent from Figure 5 and others. Attached to the link G in anysuitable way, as by a collar and bolt H is another link H operating a lever H, by means of the adjusting nuts H the lever H is pivoted at H on a stud shaft afiixed to the frame and of course is not attached to the roll H as might be'inferred from Figure 4 alone. This lever H has a notch or hook H co-operating with a sliding pin I in a stationary cam P, the

:lever being held by a spring it (see Figures 7 or shoe is immediately withdrawn, preventing marring of any bag which may be in the machine. The further detail of this is best understood from Figures 7 to 10. In these figures a stationary cam I is fixed to the frame of the machine. Passing through the cam is a sliding pin I which is engaged 'by the hook. The position of the pin I is determlned by the cam I", which rotates with the shaft 1 to which it is attached (see Figures 8 and 8") This cam has a high part I which restores the in to registry with the hookshaped part 1 of the lever H at every revolution,

Turning now to Figure 7, which must be read in connection with the other figures, it will be seen that the toggle I has been collapsed, because in this figure the hook H" has been withdrawn from the pin 1 and the pin has been shot in towards the cam I". In so doing it is brought into the path of an arm 1 of a bell-crank, the other arm of which is marked I and is notched or shouldered to engage with a detent 71 upon the' other toggle member I. As shown in Fi ure 4, when the toggle is set the arm I hol s the toggle in place against the tension of a spring 71 When the toggle is set the shoe I is elevated to the position shown in dotted lines in Figure 7 or in solid lines in Figure 4 at this time the pin I does not register with the other arm I of the bell-crank, of which the detent or pawl I is a member. When the machine stops and the hook H permitsthe pin I to be shot inward by the spring 71', the arm 1 is engaged by the pin, the detent I" is withdrawn from the corresponding detent.

71 on the toggle and the spring '5 collapses the'toggle. All of these partsare carried upon an arm I shown in Figures 7, 8 and 10. As the roll I rotates, the cam roller I at the joint in the toggle moves around the cam I, and the toggle is straightened to restore the shoe 1 so that it will register with the-bag as it comes through. At the same the pin I so that the hook H enters the reduced portion or notch I and holds it back out of registry with the arm I. Of course in the meantime the defective bag, if any, has been removed and the operator has restored the. sequence of feeding, so that the machine is ready for operation as soon as the belt is shifted. The parts are shown best in their several relations in the perspective sketch in Figure 8.

Referring now to Figures 5 and 6, the operation of the belt shifter is indicated. The bar Q, shifts the belt marked 2 and is held undertension by the spring 9, which tends to ush it to the left, so as to throw the belt 2 y means of the fork Q from the fast pulley I to the loose pulley I". The bar is held from movement by a notch g, in which a pin g registers. The pin g is upon the link Q time the high part I of the cam I restores pivoted at g and having a detent q formed upon an elbow integral with the link Q The arm 0 on the shaft 0 has a hub provided with a notch 9 which is engaged by the detent g, the arm being fixed upon the shaft 0, and carrying a crank, which in turn carries a pin which works in a slot in the rod or link Q. The operation of these parts is as follows: When it is desired to stop the machine by shifting the belt the handle 0 is raised, whereupon the notch g presses upon the detent g, lifts the link Q}, so that the pin 9 is lifted from'the notch or detent g in the rod Q, whereupon the spring 9 forces the rod to the left through the fork Q to the left, and movipg the belt from the fast to the loose pulley. hen the automatic stop arrangements shown in connection with the roll Gare brought into 0 eration, the link G, by means of the collar will lift the link Q (see Figures 5 and 6) and withdraw the pin g from the notch g to effect the same operation. It will be seen that the two methods or means of stopping the machine, though connected, are independently operative, the automatic device comin into action whenever a bag is absent from t e machine, but not interfering in any way with the stopping of the machine b hand when desired. When the belt is s iftedto the fast pulley I, seen best in F igure 5, by the hand-lever O, the roll G (Figure 4) begins to revolve, the hook G having been lifted by the cam-button 9 so that it clears the member G". The position of the pin 9 at this time may be as illustrated in Figure 4, as a bag will have been inserted between the rolls F and G before the book 9 revolves into re-engagement with the member G, the

bag thus depressing the pin 9 If necessary, bags may be introduced by hand as the machine is inched along until the feed begins to work, as is customary in the trade. At the same time the cam I (see Figure 8) will revolve until the lift I drives back the rod I against the pressureof the spring z" until the hook H engages the notch 71, thus restoring these parts to the position shown in Figure 4:. The toggle arms 1 1 then straighten out to lift the paste-pad into registry, as already described. V I

The bottoming mechanism is shown in Figure 11,. whichshouldbe read in connection with Figures 13 and 14, 15 and 16.- The first three figures show the construction of the folding cylinder M and the latter two show advanced positions of this mechanism. 1

Figure 12 shows one of the folding arms in detail. I have called the part M taken as an integer a cylinder, though as seen in Figure 14 in reality it consists of two separate disks between which the bag 0 is stretched, being carried forward by the pairs of tapes Z-Z-, the first of' which runs upon these two disks and the second upon the rollers-L L etc., as already described in connection with Flgures 1 and 2.

notch of the roll K At this time the notch 7: on the roll K is on the part of the roll which has been cut away and the creaserblade K does not register with it until the bag has moved along such a distance as to make the creaser-blade K register with the notch when the two flaps are at the proper distance apart, as shown at C G on the left side of the cylinder M in the upper part of Figure 11. WVhen the bag is in the position shown in this figure, the lower one of the folding arms'lW 2 at the bottom of the cylinder M advances and folds over the rear flap C and presses it in place, after which by the forward movement of the cylinder the second arm M at the upper left side of the cylinder in Figure 11 comes forward and presses in place the first fold C the first arm M being withdrawn just before this occurs. These arms are both constructed as shown in Figure 12. In that figure M is a spring member of steel or phosphor bronze. A hub M rotates upon a shaft M and a projection from the hub M carries the Presser-blade M" upon a lever M The lever is fulcrumed at m and turns against the pressure of the spring M regulated by a nut M The lever is rotated around shaft m by means of a camroller m pivoted to the hub M is an arm M worked by a cam-roller m The position of the hub M may be adjusted by the nuts m in a well-known way.

Returning to the upper part of Figure 11 it will be seen that there is a plurality, in this case four, of these arms, arranged in pairs. The cam-roller m travels upon the outside of one of the cams M M (see particularly Figure 14) and this controls the movement 0 the arm M M, around the shaft M. On the other hand the cam-roller m moves'in a groove in the face of the cam M that is,

two of these rollers move in the groove of the cam M and two of them move in the groove of the cam M. It will be observed that the cams M 1 are held respectively in position by means of bars M, attached to the frame, and their positions may be adjusted by means of the nuts M working in slotsin the bars M These cams are stationary and are centered upon the shaft M The four arms M etc., are mounted on a hub M (see Figure 14) and each is carried by a disk M the positions of which are independently adjustable by means of bolts, as shown, with reference to the hub M The operation of these parts is as follows: As the flaps C C approach the cylinder M a blade M is earried'forward by means of the cam-roller on operating in the groove of one of the cams M M giving an ordinary movement of rotation around the shaft of a speed sufficiently great to overtake the flap C and turn it over. After it is folded in this way the cam-roller m working on the outside is depressed and forces out the folding plate M around the center-077;, so as to press out the flap firmly, thus pressing the flap against the web of the bag C, which as shown in Figure 1 1, extends from one of the disks M to the other. These disks constitute what we'have called for convenience the cylinder? M. After this flap is folded over the upper lefthand blade M folds over the flap C in a precisely identical manner, in the opposite direction, being first advanced by means of its cam-roller m operating in the grooveof its cam, and then pressed out by means of the cam-roller m These operations are clearly indicated in Figure 15 and 16. In Figure 15 the parts are illustrated as the first flap is about to be folded over; and in Figure 16 the first flap has just been folded over (at the upper right-hand part of the figure), and the second flap C is just about to be folded over by the second one of the arms M So far as we are advised it is new to fold the flaps against the web ofthe bags from the inside of the folding mechanism or cylinder, and to press them into place while holding the webs under lateral tension. The advantage of this arrangement is that we are enabled to use a very large cylinder and to employ more than one set of folding arms upon it, working in alternation upon alternate bags. The movement of the cylinder does not need to be so rapid, or give so much centrifugal impetus, as when a smaller cylinder is used, employing only one set of folding mechanisms; and in addition the speed of rotation of the flaps C C about their creases as centers is only moderate, so that they are not snapped over hurriedly and do not throw paste, as is apt to be the case with prior devices known to us. In addition, also, any paste which is thrown will fall directly upon the spot which the flap will cover when it is finally pressed down, and does not scatter around the machine and upon the face of the bag.

Figures 17 to 19 showthe bag in its various stages of manufacture. In Figure 17 the paste-pad has printed paste upon the bag ready for folding. I11 Figure 18 the flap C has just been bent over on the crease C* and C has been bent over on the crease C as shown in side-elevation in Figure 15 at the top of the folding cylinder M; while in Figure 18 both flaps have been tucked into place and pressed down firmly.

Referring now to Figure 13, the parts are the same as those shown in Figure 14, except for the device N on the right of-the figure.

Folding fingers M M, are shown in their The ironing device on the-right of Figure 13 consists of a series of rollers N the rollers being provided with diagonal bands n projecting above their surfaces. These bands are run substantially in contact with one another, or nearly so, and the rollers serve to straighten out any creases which-may have been formed in the bag by a sort of pressing operation, the action being to put the bag under tension laterally and While under this tension to press the web from the center toward the sides.- I

It will be observed that the movement of the folding arms M M is somewhat similar to that imparted to the arms K in our parallel pending application. S. N. 723,031,

filed June 28, 1924.

We have used herein the term folding cylinder as a convenient one to describe a rotatory mechanism employed as an operating part, whether technically a cylinder, or a series of co-axial disks such as is often so designated in the trade, or some other construction.

What is claimed is:

1. In a paper-bag machine, means for automatically stopping the machine, such means brought into action by the failure of a bag to feed into a desired position, and

means brought into action by starting the machine for restoring the stopping means to an inoperative position.

2. In a paper-bag machine, means for antomatically stopping the machinewhen' a bag is absent from a desired part thereof, a paste-pad, an opposing roll therefor and means for retracting the paste-pad out of registry with its opposing roll brought into action by operation of the stopping means, both of said means being automatically r'estored to inoperative position when the machine is started after the stoppage.

3. In a paper-bag machine, mechanism for automatically'stopping the machine at desired times, a paste-pad, anopposing roll therefor, and means for moving the pad o'ut of registry with the roll; such means operated by the actuation of the stopping mechanism.

4. In a paper-bag machine, mechanism for automatically stopping the machine at desired times, a paste-pad, anopposing roll means for moving the pad out of registry with the roll, and means brought into action by starting, the machine for restoring the paste-pad to its normal registry with its roll and for putting the stopping means into inoperative position.

5. As a combination of elements in a paper-bag machine, a folding finger located between the axis and the periphery of the cylinder, the said'finger having two movements, one substantiallyconcentric with the cylinder, and the other outward from the axis toward the periphery of the cylinder it againstthe web; the

-which the web is disposed under tension,

, speed means for and cylinder rotating at substantially the to'press the flap into place after it is folded over; and a cam having a periphery, a roller upon the folding finger moving upon the periphery of the cam to impart one of said movements to the finger, 'a groove in the face of the cam and another roller on the finger co-operating with the groove to cause the second movement of the finger.

6. As a combination in a bag-machine, a folding cylinder, means for carrying the bag under tension upon the periphery thereof, and means acting outward from the axis toward the periphery for folding over and pressing down the flaps of-the bag-bottom; such means including a presser finger, and cams for giving the finger two motions, one substantially parallel to the periphery of the cylinder at a' speed suiiicient to turn overthe flap and the other substantially radial so as to press down the flap against the bag; S5 under tension while the finger and the cylin-E; der move at substantially the same speedf whereby the flap is first turned and then pressed into secure engagement with the web.

In a paper bag machine, a folding cylinder composed of disks spaced apart upon a shaft, means cooperating with the disks for holding the web of the bag under tension upon the periphery of the cylinder, and means between the axisand the periphery for first folding over a flap and then pressing said means including a presser finger and means for giving it a circumferential movement to fold the flap and then aradial movement to press it into contact with the web, rotation of the cylinder and the finger during the pressing being substantially the same.

As a combination in a paper-bag machine, a cylinder upon the periphery of separate fingers for folding the flap of the bag-bottom; means for causing one of the fingers to fold over and then press the first flap radially against the web while the finger and cylinder rotate at substantially the same withdrawing thehfirst finger, and means for, causing the second finger first to fold the second flap and then press it radially against the web, the finger same speed during 'the pressing. I

Signed at Watertown, in the county of Jefferson and State of New York, this 7th day of May, A. D. 1928..

ALFRED CLEMENT COTY. THOMAS EARL OOTY. a e

Images