US2250699A - Machine for making satchel-bottom bags - Google Patents

Description

Jul 29, 1941.

L. BISC HOFF 2,250,699

MACHINE FOR MAKING SATCHEL-BOTTOM BAGS Original Filed June 23, 1936 3 Sheets-Shae; l

July 29, 1941. BISCHOFF MACHINE FOR MAKING SATCHEL-BOTTOM BAGS Original Filed June 23, 1936- s Sheets- Shed 2 July 29, 1941. BISCHOFF MACHINE FOR MAKING 'SATCHEL-BOTTOM BAGS 3 Sheets-Sheet 3 Original Filed June 23, 1936 \w w a m Patented July 29, 1941 Ludwig Bischofi, Rockville Centre, N. Y., assignor to Oneida Paper Products, 1110., New York, N. Y., a corporation of New York Original application June 23, 1936, Serial No.

1940, Serial No. 321,957

2 Claims.

This invention is a division of my application Ser. No. 86,750, filed June 23, 1936.

This invention relates'primarily to machines for making satchel-bottom bags, and comprises more particularly mechanism for sealing the bottoms of such bags. Bags of this type are generally made'by forming a web of paper into a tube by longitudinally folding the web and adhering its edges to each other, after which the tube is divided into tubular blanks of the desired length, one end of each blank being closed to form a bag.

The particular apparatus of the present invention is designed to receive a partially formed satchel-bottom bag, i. e., a tubular blank segregated from the main tube and having a diamond fold formed at one end and lying in the plane of the blank, toform a satchel-bottom thereon and to seal the bottom by applying a patch thereto.

The present invention has particular utility in connection with'the manufacture of bags formed of transparent cellulosic materials, but is not to be considered as limited to such materials. Much difiiculty has been experienced in the manufacture of bags from such materials since these materials do not readily adhere to each other and powdered commodities tend to escape through the bottom closure. The present invention overcomes the difficulty heretofore encountered with such materials by not onlyforming an efiicient closure, but by applying an efficient sealing patch to cover the parts of the bottom closure at which leakage is most likely to occur. transparent cellulosic materials when applied to bags of transparent cellulosic material, or may be of the same material as that used in any other bag, or different materials may be used in' the patch and in the bag. Anadvantage of this construction is that a pleasing effect may be obtained by using colored patches, or advertising. may be displayed thereon.

The present invention embodies means operating upon the diamond-folded end of a bag blank progressed bottom foremost through the machine, first tocrease both points of the diamond foldtransversely of the bag in such a manner as to cause the points to project above the plane of the blank, secondly to' grip the leading point at its crease in such a manner as to insure its projecting upwardly above the plane of the blank, thirdly to whip the trailing point of the diamondfold down upon the intermediate portion thereof by mechanism traveling faster than the blank, fourthly to present the leadin The sealing patch may be made of Divided and this application March 2,

point of the diamond fold between convergent traveling surfaces whereby to press the leading point down upon the intermediate portion of the diamond fold partially to cover the trailing I; point, and fifthly, in the process of performing these operations or subsequently thereto, to apply a patch to the bottom of the bag which covers the overlapped points of the diamond fold.

The mechanism operates in a continuousmanher with proper synchronism of all parts whereby patches are adhesively secured to successive bag bottoms and the finished, sealed bags discharged from the machine in completed condition. V

While the invention is particularly directed to apparatus for accomplishing the operations stated, there is nevertheless a newmethod by which these operations are performed.

Objects and advantages of the invention will be apparent from the hereinafter detailed description and claims when read in conjunction with the accompanying drawings wherein like parts are referred to by like numerals through} Fig. 5 is a similar plan view showing the se-' quence of operations in the mechanism of Figs.

2 and 3;

Fig. 6 is a diagrammatic section of a portion of the mechanism of Fig. 1; Fig. 7 is a detail View taken along line 'l-'! of Fig. 1, looking in the direction of the arrows; Fig. 8 is a view partly in section of a modified part which canbe substituted fora part common to both modifications of the machine; and

Fig. an a cross-section taken on line 9-9 of Fig. 8.

In the-manufacture of bags by'th machine of Fig. 1, and according to the process disclosed in Fig. 4, a bag blank 20 provided with a diamond fold 2! at one end lying in the plane of the blank,

the points of which are provided'with adhesive" as at 22','the folding of which and the application of. adhesivethe'reto having been accom-i plished by known means common in the art, is introduced between tapes and 26 traveling in the direction of the arrows, the diamond fold of the blank being foremost. The lower belts 26 pass about guide rolls located near to the surface of a revolving crimping drum 21, about a portion of which the bag is progressed while gripped against the surface of the drum by the tapes 25, which are spaced so as to engage the blank close to its longitudinal edges, and a tape 28 which is guided in a groove in the drum 2'! so as to engage the opposite surface of the bag close to its center. A pair of crimping blades 29 upon a rotating shaft 30 cooperate withthe crimping drum 21 to form creases 2| and 32 in the diamond-folded portion, thereby defining a leading point 33 and a trailing point 34 which by reason of the formation of the fold lines by the crimping blades naturally project upward above the plane of the blank between the tapes 25. The foremost crimping blade tucks the folded portion between a clamping surface 35 formed on drum 2! and a clamping blade 36 operated by a cam follower 31 and a fixed cam 38 to clamp the foremost crease immediately upon the formation thereof and positively carry the bag around the axis of the drum. The second creasing blade 29 presses against one of a series of rubber bars 39, each designed for a certain size of bag. Traveling chains 40 pass about the shaft 30 and are guided outside of tapes 25. Chains 40 carry a folding bar 4| extending transversely of the blank and traveling in the direction of the arrow at a higher rate of speed when adjacent the drum so that immediately after the fold line 32 is formed the folding bar 4| engages the upstanding point 34 and whips it down onto the main portion of the diamond fold where the adhesive 22 tends to retain it. Chains 40 pass about a guide roll 42 and carry the bar back to engage the next bag. Immediately after the bottom leaves the vicinity of guide roll 42 it is engaged between the surface of a transfer roll 45 and the surface of drum 21, the surface of the transfer roll engaging the leading point 33 and pressing it down into overlapping engagement with the trailing point. Blade 36 is now released and the bag is held between belt 28 and transfer roll 45 while the adhesive partially sets.

At the other side of roll 45 there is provided a feeding drum 46 rotating in the direction of the arrow and having associated therewith a stationary cam 41. Four sets of feeding fingers 48 are carried by the feeding drum 46, and are provided with cam followers 49 operating the fingers in accordance with the contour of a stationary cam 41. As the fingers 48 approach the nip between drum 46 and roll 45 they are held in raised position and fit into a recess 58 in the surface of the roll. The leading edge of the bottom of the bag is introduced under the tips of the feeding fingers 48 which immediately grip the bag. The bag is now progressed by the feeding drum 46 and the tapes 25 and 28 to a point adjacent a patch applying cylinder 55.

The patch applying cylinder is supplied with patches severed from a strip 56 unwound from a roll 51 by feed rolls 58 and 59. The strip passes about a fixed tensioning roll 60 and a movable slack-providing roll 6|, which is operated by a cam 62 fixed to a rotating knife carrier 63, in order that slack may be provided in the strip at the instant a patch is severed between the rotating blade 64 and a cooperating blade 65 operated by a second cam 66 likewise rotating with the knife carrier 63. The foregoing patch cutter and slack providing means'is the same as mechanism for accomplishing the same purpose disclosed in my prior United States Letters Patent No. 2,037,110, dated April 14, 1936. As the patch 18 is separated from the strip 55 it is fed between the surface of the knife carrier 63 and tapes H engaging its longitudinal edges. The patch applying cylinder 55 is positioned between the knife carrier 63 and the feeding drum 46 and is provided with one or more fingers l2 operated by a stationary cam 13 to grip the leading edge of the patch (as shown in dotted outline), as in the said patent. As the finger travels around toward the feeding drum the cam does not alter its position, but at about the instant that the finger reaches the periphery of the drum 46 it is raised by a high point on the cam. Likewise, the bag gripping finger 48 is sharply raised by a high point 15 of cam 41 and extends into an opening 14 in the patch applying drum. The high point 15 of cam 41 is of short extent so that as a patch is positioned over the bottom of the bag and released by finger II it is immediately clamped onto the bag bottom by the gripping fingers 48. The patch is provided with adhesive before it reaches the bag by a conventional applying roll 16 engaging a fountain roll 11.

The patch holding tapes 1| leave the surface of the feed drum 46 substantially as soon as gripping fingers 48 engage the bag and the bag bottom with the patch applied thereto is then pressed between the surface of the drum 46 and a pressing roll 88 thereby assuring even application of the patch and its firm adherence to the bag. The tapes 25 then leave the surface of the feeding drum 46 and return to the initial point of introduction of bag blanks to the machine. The bag is now held between the surface of the drum 46 and the fingers 48. The drum 46 is provided with grooves 8| into which extend stationary strippers 82 mounted upon a magazine 83. The tape 2 8v extends away from the surface of roll 46 substantially parallel to the strippers 82, which arrangement assists the strippers in positioning the lead ing edge of the bag in the magazine 83. At the instant that the leading edge of the bag reaches the bottom of the magazine the fingers 48 are raised by cam 41 and are then held in raised position until they engage another blank at transfer roll 45. The finished bags are retained in upright position between the stripper fingers 82 and, a receding, pressing anvil 84, by which the fin-v ished bags with the applied patches are held in.

the magazine until the adhesive finally sets.

The foregoing embodiment of the invention.

7 may be more desirable by reason of a different plant arrangement, but nevertheless embodies a practical, working arrangement having the same advantages as the previous form, but operating in a different sequence. The machine of the second embodiment is shown in Figs. 2 and 3 and the sequence of operation is shown in Fig. 5.

Referring to these figures, there is diagrammatically disclosed a former I00 about which a web is drawn by rolls Hll', formed into a continu-v ous tube m2 and cut into tubular blanks by a shear 1&3. At I04 the blanks 20 are provided with a diamond fold 21 by known means; The mechanism I04 passes the blanks between traveli ng tapes 25' and 26' with the diamond-foldedportion foremost. Tapes 26 extend close to the surface of a patch applying cylinder 55' located tangentially to the tapes 25'. The patch applying cylinder 55' is supplied with patches I cut from a web 56' drawn from a roll 51' of the patch material by pairs of feed rolls 58- and 59. Theweb is drawn about a slack providing roll BI operated by a cam 62 fixed to a knife carrier 63' so that slack is provided in the web 56 at the instant of cutting. The knife carrier carries a rotating blade 64' which cooperates with a movable blade 65' operated by a cam 66 also fixed to the knife carrier. As the patch I0 is severed from the web it is fed between the surface-of the knife carrier and travelling tapes H which grip the longitudinal edges of the patch and present the leading edge of the patch beneath the finger I2 carried by the patch applying cylinder 55' and operated by a stationary cam 13' in the manner previously described. As the patch travels about the surface of the cylinder 55' it is provided with adhesive by an applying roll 16' engaging a fountain roll 11'. As the finger comes into engagement with the leading edge of a bag it is raised by cam I3 into a recess I4 provided in a pressing roll I05. The mechanism is timed to adhere the patch to the lower surface of the foremost point of the diamond fold. The bag is then progressed between the tapes 25' and H until the tapes II return to the patch forming mechanism and the bag is then gripped between tapes 25' and a lower feeding belt H0. As the bag is progressed it passes beneath an adhesive applier I II rotating into periodic engagement with a fountain roll H2 and applying adhesive as at 22 to the surface of the diamond fold. Belts III! extend close to the surface of a crimping drum 2'! which is provided with a clamping surface 35, a clamping finger 36, a finger operating cam follower 31 engaging a fixed cam 38', and a set of rubber bars 39' similar to and for the purposes of corresponding parts described in connection with the crimping drum 21. The tapes 25' are guided partially around the surface of drum 2'! and engage the outer edges of the bag as previously described. Crimping blades 29' mounted upon a shaft 3 provide transverse creases 3| and 32 which define upstanding points 33 and 34 in the diamond folded portion of the bag, the foremost crease 3| being gripped between the surface 35' and the finger 36' positively to progress the bag. Spaced chains 4!! guided about the surface of shaft 3|! and a guide roll 42' carry a bar M which is travelling at a higher rate of speed than the bag and which whips the trailing point 34 down onto the intermediate portion of the diamond-folded end as previously described. Tapes 25' are guided about a roll H positioned closely adjacent to the surface of drum 2'! and thereafter return to the initial position. The foremost point 33 with the attached patch 10. which is held in substantially upright position by the clamping surface and clamping finger, is engaged between the convergin traveling surfaces of drum 2'! and roll H5 and thereby smoothly adhered to the intermediate portion. of the diamond fold and the trailing point 34. Immediately thereafter fin er 36' is released by cam 38' and the bags are ejected from the machine into a magazine as previously described or into other mechanism of known construction.

In Figs. 8 and 9 there is disclosed a modified part which can be substituted for the patch applying cylinder 55-. of Fig. 1, or 55" of Fig. 2, and comprises suction operated means for engaging and applying the patch to the bag. A drum I2Il is provided with grooves I2I within which the patch feeding tapes II are guided while passingabout the drum. The shaft I22 is provided with a passage I23 communicating with a chamber I24 fixed to the inner surface of the drum. The chamber communicates with the outer surface of the drum through a line of perforations.

I25 extending longitudinally of the drum. The passage I23 communicates with a conduit I26 extending to a vacuum pump or other means for producing suction within the chamber I24. A by-pass I21 communicates with an opening I28 in a collar I29 during a portion of the cycle of rotation as shown in Fig. 9. As the leading edge of a patch I0 is presented to the drum I20 by the tapes II and knife carrier 63 the by-pass I2! is blocked by the solid portion of collar I29, as shown, and the immediate differential in pressure within the chamber I24 causes the leading edge of the patch to be fed by the drum until the by-pass again reaches the opening I28, at which time the patch has been adhered to the leading point 33 of the diamond fold (Fig. 4) or to the,

bottom of the bag (Fig. 5).

Having described the illustrated embodiments of my invention it will be readily apparent to those skilled in the art that other modifications in arrangement and detail may be substituted for those shown. All such alterations, modifications are rearrangements as come within the scope of the following claims are a part of my invention.

I claim:

1. In a machine for manufacturing satchelbottom bags, a crimping drum having spaced belts passing partially thereabout for holding the longitudinal edges of a diamond-folded bag blank against the surface of the drum, said drum being provided with clamping mean-s and a resilient block in spaced relation, in combination with a pair-of creasing blades mounted adjacent the surface of said drum, the foremost of said. blades being adapted transversely to crease the foremost point of the diamond-fold and to tuck the crease so formed into said clamping means and the second of said creasing blades being adapted to crease the trailing point of the diamond-fold by pressing the same against said resilient block,

means traveling faster than said bag blank to overtake and whip the said trailing point down onto the intermediate portion of the diamondfold, a roll adjacent said crimping drum presenting therewith converging travelling surfaces adapted to fold the foremost point of said diamond-fold into overlapping relation with the trailing point, and means located prior to the foregoing mechanism for adhesively securing a patch to the foremost point of said diamond-fold with the patch extending beyond the said point whereby the patch will be caused to cover the overlapped points when positioned by said foregoing mechanism.

2. In a machine for manufacturing satchelbottom bags. a crimping drum having spaced belts passing partially thereabout for holding the longitudinal edges of a diamond-folded bag blank against the surface of the drum, said drum being provided with clamping means and a resilient block in spaced relation, in combination with a pair of creasing blades mounted adjacent the surface of said drum, the foremost of said blades being adapted transversely to crease the foremost point of the diamond-fold and to tuck the crease so formed into said clamping means and the sec- 0nd of said creasing blades being adapted to crease the trailing point of the diamond-fold by pressing the same against said resilient block means traveling faster than said bag blank to overtake and whip the said trailing pointdown onto the intermediate portion of the diamond fold, a roll adjacent said crimping drum presenting therewith converging traveling surfaceslo' adapted to fold the foremost point of the diamond-fold. into overlapping relation withthe-

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