US1577472A - Machine for closing paper sacks - Google Patents

Description

March 23 1926. 1,577,472

F. A. KUCERA ET AL MACHINE FOR CLOSING PAPER SACKS Filed p il 10, 192 e Sheets-Sheet 1 I e J m. @50 1 I.

March 23 1926. '1,577 ,472

F. A. KUCERA ET AL MACHINE FOR CLOSING PAPER SACKS Filed April 10; 1924 s Sheets-Sheet 2 March 23 ,1926; v 1,577,472

F. A. KUCERA ET AL v MACHINE FOR CLOSING PAPER SACKS Filed April 10, 1924 6 Sheets-Sheet 5 March 23 ,1926. 1,577,472

- F. A. KUCERA ET AL MACHINE FOR CLOSING PAPER SACKS Filed April 10, 1924 6 sheets-$118 4' will 1Y 3M MM 57% TVIarch Z3 1926. 1,577,472

F. A. KUCERA ET AL MACHINE FOR CLOSING PAPER SACKS Filed April 10, 2 6 Sheets-Sheet 5 March 23 1926. 1,577,472

F. A. KUCERA ET AL MACHINE FOR CLOSING PAPER SACKS- Filed April 10, 1924 6 Sheets-Sheet 6 i provide a machine of the above type wherein UNITED STATES 1,571,472 PATENT OFFICE.

FRANK A. KUCERA AND CHARLES I". RUBEL, OF CHICAGO, ILLINOISQASSIGNOIR TO OF CHICAGO, ILLINOIS, A CORPORATION OF I UNION SPECIAL MACHINE COMPANY, ILLINOIS.

MACHINE FOB CLOSINQ PAPETR SACKS.

Application filed April 10,1924. Serial No. 705,570.

To all whom it mag] concern:

Be it known that we, FRANK A. KUCERA and CHARLES F. RUBEL, citizens of the United States, residing respectively, at Chicago, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Machines for Closing Paper Sacks, of which the following is a; description, reference being had to theaccompanying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in sewing machines, and more particularly to a sewing machine which is adapted to stitch and close apaper sack.

An object, of the invention is to provide a machine'for closing paper sacks wherein the fabric is placed along the walls of the sack at the mouth thereof as it is stitched so that the stitches for closing the sack pass first through the fabric and then through the paper walls at the mouth of the sack so that the fabric affords an anchorage for the stitches.

Another object of the invention is toprovide a machine of the above type with a trimming mechanism having the trimming blade thereof operating in advance of the stitching mechanism so that the walls at the mouth of the sack are trimmed prior to the closin of the sack.

Afi rther object of the inventionis to the fabric .which serves as an anchorage for the stitches extends about the trimme sides of tlzhe sack, thus enclosing the mouth of-the sacr.

A still further 'object of the invention is to provide a machine of the above type having means for cutting thethreads between successive sacks, wherein the cutting blade cutting the threads andlthetrimming blade for trimming the'paper atthe mouth of the sack are both operated by the same connection with the movingpart of the sewing mechanism. l

A still further object of the invention is to provide a machine of the above type wherein the fabric passes through a folder of the English binder type, which folder is located close to the work supporting arm of the machine and is. ieldingly mounted so that it may be raise the p'ag'ts of the-machine to permit the ready lustration one" or moved away from strip roll is mounted on a bracket carried by "the arm of the machine, so that the entire machine with its fabric support is a unit,

and can beraised and lowered as a unit.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings which show by way of ilembodiment of the inven tion i 1 Figure 1 is a front view ,of a portion of a filled bag closing machine-.ihaving our improvements ap lied theret0;-q..i

Fig. 2 is a sideview of the sewing head from the side of the machine entered by the bag to be closed;

other side from that shown in Fig. 2;

Fig. 4 is an enlarged view showing the end of the cylinder and the stationary cutter of the thread cutting mechanism;

Fig. 5 is an enlargedview of the end of the cylinder and the parts adjacent thereto as viewed from below;

Fig. 6 is a perspective view of the presser foot as viewed from above; T

Fig? is -an enlarged front view of the work cylinder, also showing the resser foot,

the trimming mechanism an guideassoeiated therewith; n

Fig. 8 is :hfront view of the end. of the thread cutter and trimmingmechanism, also showing diagrammatically the fabric strip} passing through the machine, and

Fig. 9 is a section Fig. 7.

The filled bagclosing machine which is adapted for closing the'mouth of a paper sack- It is a well-known fact that paper easilytears and is not readily adapted for a sack closed" by stitching, Prior to ourinventio'n, it has been proposed to provide a fabric strip which may beused as an anchorage for the stitched for closing, the stitches thus the" strip 9o Fig. 3 is a side view of the machine at the on the line 9-9 of invention directed broadly a stitches so that the mouth of a bag maybe anchored by the fabric serve to hold the mouth closed under the strain of handling.

The patent to \Veatherwax No. 962,934.", granted June 28, 1910, shows such a bag. This VVeatherwax patent, however, is a specially constructed bag in which the fabric strip is made a part of the bag before it is filled. The present invention has to do with a bag of the type above referred to and includes a machine wherein the fabric strip is applied to the bag as it is stitched, so that the paper bags maybe made up as usual, filled and fed into the machine without any thought or care of the attachment of the fabric strip thereto. The machine includes a trimming mechanism which operates to trim the sack in advance of the needle so that the trimmed side edges will be a definite distance above the line of stitching. A fabric guide of the English binder type is arranged to direct a strip of fabric into the machine and fold the same about the trimmed side faces of the mouth of the bag and in such a way that the needle will pass through a side wall of the folded strip first, and then through the paper walls of the bag, and the fabric strip will afford an anchorage for the stitches so that the threads will not tear through the paper. The improved filled bag closing machine includes means whereby the needle and the bag to be closed have a relative step by step movement during the stitching of the bag for closing the same. This may be brought about by the movement of the bag itself, on a suitable conveyor, a supporting carriage or the like,

' or by the movement of the sewing head.

In Fig. 1 of the drawings we have shown a portion of a filled bag sewing machine wherein the paper bag is indicated at 1. A support for the bag is indicated at 2. As

noted above, said support may be of the traveling belt type as shown in the patent to Bigelow No. 895,311, granted December 1, 1907, or it may be a stationary support and the sewing head mounted to travel back and forth relative to the support. The sewing head of the improved filled bag sewing machine except for the trimming mechanism applied thereto is of the type shown in th patent granted to D. S. Seymour, July 6, 1915, No. 1,145,620 and includes a work supporting cylinder 3 which is carried by a standard 4. Said standard is also provided with an overhanging arm 5 in which a needle bar 6 is reciprocated by the aid of a needle lever 7. Said needle lever 7 is connected to the needle bar 6 by means of a link 8. At the lower end of the work supporting cylinder there is a throat plate 9 provided with slots through which the feed dog 10 operates to feed the parts being stitched. This feed dog and its operating mechanism is similar to that shown in the Seymour patent above referred to, and detail description thereof is not thought necessary. The bag is held against the throat plate by means of a presser foot 11 carried by a presser bar 12 mounted in the head of the machine. The presser foot is pivoted at 13 to a supporting shank carried by the presser bar 12. Said presser foot has a relatively long turned-up extension 14- at its forward end so as 10 aid in the directing of the bag between the presser foot and the throat plate. The work supportingcylinder is rounded off at 15 so as to cooperate with the extension of the presser foot in the directing of the bag to the stitching mechan1sm.-

As has already been noted, the paper sack as it passes beneath the presser foot is trimmed by means of a trimming mechanism. This trimming mechanism includes a movable trimming blade 16 which cooperates with a stationary blade 17 formed as a part of the throat plate (see Fig. 8 of the drawings). The movable blade is carried by a lever 19 which is pivoted at 20 to a depending bracket 21 carried by the head of the machine. The end of the lever 19 opposite the trimmer blade is pivoted at 22 to a link 23 which in turn is pivoted to an arm 24: extending from the thread cutter lever 25. This thread cutter lever and its operating mechanism will be referred to more in detail later. The trimmed ofl' portion of the bag engages a strip deflector 26 which deflects said trimmed oif strip away from the stitching mechanism.

It is rather difficult to bring the extreme edges of the side walls of the bag together, and particularly so of a paper sack. When the trimming mechanism is used, however, for trimming these side walls on a definite line relative to the stitching mechan sm, it is lmmaterial whether the edges of the side. faces of the bag are at the same height or not when the bag goes into the machine.

All that is necessary is that these edges shall be above the trimming line so that both the side walls will be trimmed and thus leave the trimmed portions clamped by the presser foot and in such position that a needle will pass readily through the same as the feed carries the bag to the stitching mechanism.

A needle is indicated at 6 in the drawings, and cooperating with said needle is a thread carrying looper 27 which is preferably of the construction shown in the Seymour patent above referred to. Between the trimming blade 16 and the needle 6 is a guide 28 of the English binder type, which is adapted to guide, fold and invert the fabric strip. This guide 28 is located ina recess 29 in the throat plate, and a recess 30 in the presser foot and extends both to the front and rear of the plane of the throat plate, so that the mouth of the bag passing along the face of bag to the next bag. 7

may be caused to enter a slot 42 in rear of the needle (3 (See Fig. 8). At the rear end.

the throat plate, will pass through the U shaped channel on the forward end ofthe machine as clearly shown in Fig. 1, and then across the guiding post 34 into the guide 28. The stri as it leaves the guide 1s inverted as 0 early shown in Fig. 3, and the sidewalls of the bagpass intothe lnverted strip in such a way-that the needle-will form a line of stitches 35 through the fabrlc strip and through the side walls of the paper sack. Thus it is that the fabric strlp serves as an anchorage for the stitches and also serves as a clamping means for clamping the side walls of the sack one against the other, and thus holding the bag closed. As shown in Fig. 2, it will be noted that thisguide 28 is in front of the removable cover plate 36.

The guide is carried by a shank portion 37 mounted on two bolts 38 and 39 which extend through slots in the shank. While these bolts support the guide, they do not clamp it. It is free to move on the bolts. A spring 40 bears against the left-hand end of the shank and forces the guide toward the cylindricalwork support. The purpose of this ielding mounting of the guide is to permit the guide to be raised slightly to withdraw or insert the cover plate 36. A guard wire or bar 41 is secured to the presser foot and shields the needle and the trimming blade so that the operator will not be caught by these parts during the operation of the machine. After the bag has been stitched, it passes from the machine and the machine forms a chain of stitches extending from one This chain of stitches of this slot there is a cutter 43 carried by a cutting lever 25 referred to above. Said lever is pivoted at 44 to a lug carried by the cylindrical work supporting arm. The lever -is oscillated by means of a link 45 which is pivoted at 46 to the lever, and is pivoted at 47 to the arm 48 (see Fig. 8). Said arm- 48 is in turn oscillated by a moving part of the feeding mechanism of the machine. This cutting member is similar in construction to the thread cutting member-of the Seymour Patent No. 1,170,349 granted February 1, 1916, and further descri tion thereof is not thought necessary. 1V ile, in the present invention, this cutting lever performs the function of cutting the thread, it also preferably performs another function, that is, it operates to cut the tape which is stitched to the mouth of the bag during the closing thereof. In other words, the tape, together with the stitches will run from one bagmto' another, and the severing knife severs bot the tape" and the stitching threads.

The cutting blade 43 cooperates with a-stationary cutting blade 4Qywhich is clamped in a groove in the work's'upport bymeans of a screw 50. An oiling pad 51 is located directly in rear of the cutting blade 43, and the movable blade is pressed against the stationary blade by meansof a spring 52. As shown in the present embodiment of the invention, the cutting blade which severs the stitches and the tape between filled closed .sacks and the trimming blade which trims the walls of the sack, are both operated from the same shaft on the arm of the sewing .head. 'It will be understood, of course, that these members may be otherwise operated without departing from the spiritof the invention as set forth in the appended claims.

The sacks are filled in any desired manner, and are placed on the support therefor and fed to the stitching mechanism, or placed on a suitable support such as weighing scales or the like, and the sewing mechanism fed across the top'of the stationary sack. The

side walls of thes'ack are brought together aid are directed between the presser' foot and the throat plate so that said side walls will be trimmed by the trimmingmember. The trimmed edges passing the trimming blade will enter the fabric guide and the fabi'ic guide will fold the strip of fabric about the side edges so that the fabric and the trimmed edges of the sack will'be entered by the needle and a line of stitches formed parallel with the trimmed edges and anchored in the fabric strip so as to close the bag. The bags after they are closed pass one after the other out from beneath the presser foot and the chain of stitches connecting ad.- jacent bags will drop into the path of the thread cutter 43 which is continuously reciprocating.

It is obvious that minor changes may be made in the details of construction and the arrangement of the parts. The essential features consist in the trimming of the side walls of the bag prior to the closing of the same and the placing of the fabric strip about the mouth of a paper sack so as to form a proper anchorage for the stitches.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, isv 1. A sewing machine for closing a filled. sack comprising a support for the filled sack, a sewing head overhanging the support and including stitching mechanism having a horizontally reciprocating needle, and a trimming mechanism having a trimming blade operating in front of and above said needle to trim and even the side walls of the sack prior to the stitching of said side walls together for closing the sack.

2. A sewing machine for closing a filled paper sack comprising a support for the filled sack, a sewing head overhanging the support and including stitching mechanism having a horizontally reciprocating needle, and a trimming mechanism having a trimming blade operating in front of and above said needle to trim and even the side walls of the sack prior to the stitching of said side walls together for closing the sack, and means operating between the trimming blade and the needle for placing a fabric along each side of the mouth of the sack after it is trimmed and prior to the stitching of the sack so that the stitches Will pass through 'the fabric strip and'the side edges of the sack thereby closing the sack.

3. A sewing machine for closing a filled paper sack comprising a support for the filled sack, a sewing head overhanging the support and incli'iding stitching mechanism having a horizontally reciprocating needle, and a trimming mechanism having a tr'nr ming blade operating in front of and above said needle to trim and even the side walls of the sack prior to the stitching of said side walls together for closing the sack, a strip guide located between the trimming blade and the needle for guiding and folding a strip of fabric about the trimmed side walls of the mouth of the sack and positioning said strip so that the needle will pass through the strip as well as the side walls of the sack and the stitches will be anchored in the fabric strip.

at. A sewing machine for closing a filled paper sack comprising a support for the tilled sack, a sewing head overhanging the support and including stitching mechanism having a horizontally reciprocating needle, a trimming mechanism having a trimming blade operating in front of and above said needle to trim and even the sidewalls of the sack prior to the stitching of said side walls together for closing the sack, a strip guide located between the trimming blade and the needle for guiding and folding a strip of fabric about the trimmed sidewalls of the mouth of the sack and positioning said strip so that the needle will pass through the strip as well as the side walls of the sack and the stitches will be anchored in the fabric strip, and means for yieldingly supporting "said strip guide so that it may be raised vertically to facilitate the removing of the cover plate of the machine.

5. A sewing machine for closing a-filled papersack comprising a support for the filled sack, a sewing head overhanging the support and including stitching mechanism having a horizontally reciprocating needle, and a trimming mechanism having a trimming blade operating in front of and above said needle to trim and even the side walls of the sack prior to the stitching of said side walls together for closing the sack, and means operating between the trimming blade and the needle for placing a fabric along each side of the mouth of the sack after it is trimmed and prior to the stitching of the sack so that the stitches will pass through the fabric strip and the side edges of the sack thereby closing the sack, and a severing mechanism located in rear of the stitching mechanism and operating in a plane at right angles to the line of feed for severing the fabric strip and the enchained stitches extending between the stitching mechanism and the closed bag.

(3. A sewing machine for closing a filled paper sack comprising a support for the filled sack, a sewing head overhanging the support and including stitching mechanism having a horizontally reciprocating needle. and a trimming mechanism having a trimming blade operating in front of and above said needle to trim and even the side walls of'the sack prior to the stitching of said side walls together for closing the sack, a strip guide located between the trimming blade and the needle for guiding and folding a strip of fabric about the trimmed side walls of the mouth of the sack and positioning said strip so that the needle will pass through the strip as well as the side walls of the sack and the stitches anchored in the fabric strip, and a severing mechanism locatediin rear of the stitching mechanisn'i and operating in a plane at right angles to the line of feed for severing the fabric strip and the enchained stitches extending between the stitching mechanism and the closed bag.

In tcstimony whereof, we affix our signatures.

FRANK A. KUCERA. CHAS. F. RUBEL.

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