US2032503A - Process and apparatus for sealing paper bags - Google Patents

Description

March 3, 1936. J ROSMAlT 2,032,503

PROCESS AND APPARATUS FOR SEALING PAPER BAGS Filed May 2, 1932 3 Sheets-sheaf; l

. INVENTOR. c/ofin A. Posmaz'b ATTORNEYS.

March '3, 1936. J A ROSMMT 2,032,503

PROCESS AND APPARATUS FOR SEALING PAPER BAGS Filed May 2, 1952 5 Sheets-Sheet 2 llllllllllll l INVENTOR.

ATTORNEY-3.

March 3, 1936. J. A. ROSMAIT 2,032,503

PROCESS AND APPARATUS FOR SE ALING PAPER BAGS Filed May 2, 1932 5 Sheets-Sheet 5 INVENTOR.

ATTORNEYS.

c/o/m A. Fosmai 1: y)

+ k NT LI l ua V v Patented Mar. 3, 1936 UNITED-STATES PATENT OFFICE,

rnocnss AND APPARATUS FOR SEALING rArnn BAGS I John Bosmait, Manistee, Mich. Application May 2, 1932, Serial No. 608,580

' '15 Claims. (01. 93-35) My invention relates to an improved process and apparatus designed, to function in connection with the manufacture of pasted bags to effect 'a permanent and secure closure of the pasted bottoms of the bags.

My improved process and apparatus cooperates with conventional manufacturing mechanism for forming pasted paper bags and is adapted to form a part of the continuous process of manufacturing such bags. It is particularly advantageous in connection with the manufacture of multiple wall pasted bags where difliculty has always been experienced in efiecting a secure closure of the bag bottoms.

The invention relatesto the closing of one end of the bag forming tube or tubes during the manufacturing operation and prior to the filling] of the bag rather than to the closure of a filled bag. An object of my invention is'to so deliver pasted bags in a continuously moving stream that they may be arranged in an' overlapping succession possessing a shingled effect which" successionmoves continuouslyforward and. is subjectedto pressure uponthe pasted bottoms of the bags as they move along for such a length of time as isnecessary to cause the paste to take an initial set.

A further object is to bring this pressure to bear only upon-the pasted bottoms of the bags so that a uniform pressure will be maintained upon those portions of the bag walls which are coated with adhesive and so that .all the pressure brought to bear will be taken upon portions of the bag walls where the desired resulting eifect will be obtained.

Other objects and advantages will more fully appear from the following specification, appended claims and accompanying drawings, wherein:

Fig. 1 is a diagrammatic view of bag forming mechanism embodying my invention.

Fig. 2 is a side elevation of mechanism embodying my invention.

Fig. 3 is a plan of the mechanism shown in 45 Fig. 2. 1

' Fig. 4 is a. perspective of a partially formed bag.

Fig. 5 is a perspective of a bag more completely formed than in Fig. 4 but still incomplete.

Fig. 6 is a perspective of the bag, the bottom 60 of which has been interfolded: and pasted.

7 is an enlarged fragmentary view takenon the same line as Fig. 1.

In the manufactureof paper bags paper is delivered from a roll supported for unwinding 55 andinterfolded and secured together to form a continuously advancing tube. 'This tube is cut off into desired lengthsand ends of the successive lengths are interfolded and secured together to form the complete bag. This is a well known process. In the manufacture of paper bags hav- 5 ing a multiplicity of walls, rolls of paper are supported so that'the tubes formed therefrom are interleaved and. the, complete bag is formed of the several plies. These several plies are inter- -folded at the ends to'form the bottom of the 10 there was a tendency for the pasted bottoms of 20 the bags. to unfold immediately following the application of the paste theretoand the paste may take initial set before the pressure is brought to bear upon the bags in the pile and while the bottoms are partially unfolded.

Applicant's process is designed to overcome this objection in that applicant intends to bring. pressure to bear upon the pasted bottoms of the bags immediately following the application of the adhesive thereto, and to maintain such pres- 30 sure for that-{period ofv time which will insure the adhesive taking an initial set while the bottoms are held together. In the severalfigures of the drawings: applicant shows -means, in the form' of a succession of rolls indicated generally as Ill, 35 for delivering a folded pasted bag l2 to a traveling conveyor I 4 to pass underneath a second conveyor belt l6 and over a large roll l8 and a succession of small rolls indicated as supporting the belts I4 and I6 so' that the bag I! is dis- 40 charged as shown in Fig. 1 with the bottom 20 folded underneath the bag. In Figs. 4, 5 and 6 are shown various steps in the-folding of the bottom of the bag which' is secured together by adhesive. It is apparent that. any conventional neath the side wall of the bag.

My invention comprises apparatus adapted to cooperate with this mechanism for folding and pasting a bag and which receives the bags as they are delivered in the substantially continuous stream from the bag forming machine. I pro-v vide a supporting structure of frame work 22. This supporting frame carries an endless chain conveyor 24 which travels over sprockets 264 One of these sprockets is driven from a suitable source of power 28 as shown in Fig.2. The other sprocket is provided with an adjustment 30 to vary the tension on the chainwhich travels over the sprockets. Supporting-guide rails32 are provided as shown in Figs. 2 and 'I. This conveyor 'chain 24 is provided with a succession of closely 'spaced rigid blocks 34 which extend crosswise of the chain and bear directly on the guide rails 32.

superimposing the endless conveyor 24 is a second endless chain structure 36. This chain travels over sprockets 38. One of these sprockets is provided with an adjustment 4|]. The sprocket member 42 is mounted upon a lever 44 which .carries an adjustable counterweight 46 and this sprocket member 42 rides upon the lowermost stretch of the upper chain to hold the same with considerable pressure against the uppermost stretch of the lower chain. The upper chain carries a closely associated series of weighted blocks 48 which may be formed of cast iron and which are arranged to superimpose the blocks 34 of the chain conveyor 24. A conveyor 50 is arranged to receive the bags discharged from'the conveyor 24 to carry them to a suitable container or place of storage. In Figs. 1, 2 and 3 the bags are shown being subjected to the operation de-:

scribed.

In addition to the chain conveyor and the endless chain pressure mechanism the supporting frame is provided with a second endless chain conveyor device-wherein the chain is indicated as 52 and the sprockets as 54. A guide rail 56 is shown disposed ,between the chain '52 and thechain 24 and extending parallel thereto and adapted to form an additio nal support to the bags. In the operation of the device the bags, with the bottoms pasted, are.de1ivered as shown from the mechanism indicated in Fig. 1 with the interfolded pasted bottoms folded over underneaththe bag in a continuously advancing endwise moving stream on to the chain conveyor 24. The bags are deposited on to this chain conveyor so as to be advanced sideways by the conveyor. The pasted bottoms are disposed immediately over the conveyor blocks 34. The bags are deposited on the conveyor as shown in Figs. 2, 3 and '1, namely, in an overlapping shingled relationship.

In Fig. '7 a succession of the bags with pasted bottoms are shown as they lie upon the conveyor.

The same is true of Fig. 2 and this arrangement is more clearly brought out in Fig. 3. The

weighted endless chain 36 superimposes the end- 5 less chain conveyor 24 and the weighted blocks 48 rest directly upon the pasted bag bottoms.

The chain conveyor 24 rides over the guide rails those coated with adhesive.

the pressure exerting members are arranged on an excessively long conveyor upon which pressure is placed. It is apparent that the conveyor upon which pressure is brought to bear may travel at a far slower rate of speed than the conveyor which delivers the bags from the pasting machine to the pressure conveyor for advancement there: 7

by. Due to the fact that the pressure is brought to bear only upon the pasted-bottoms of the bags,

there is no tendency upon the part of other portions of the bags to take such pressure to the disadvantage of the pasted bottoms. are arranged merely in piles and pressure distributed evenly thereover it may happen that this pressure may be taken by portions other than In my arrangement opposite sides of the adhesively coated bottoms only and the remainder of the bag is free except that it is supported by the rail 50 and the con-. veyor 52 so that the bag stream moves along at a uniform rate.

Due to the delivery of the bags with the pasted bottoms folded underneath the bags are stacked When bagsin a moving line with the bottoms-in alignment. I

A further advantage of'delivering the bags in what might be termed the shingle method of arrangement is that it is possible for the operator to grasp a large number of bags which are fed out in delivering much more readily than when the I bags are delivered singly without'this method of overlapping.

As the bags are delivered continuously in an to take care of a large number'of bags in a relatively short time and such a method of delivery overlapping shingled arrangement it is possible accommodates itself to the most expeditious bag I of bag movement delivers the bags to an operator I in such a manner that the operator is readily able tocollect the bags in stacks orpiles and'withdraw them to other places of deposit. The operv-' ator is therefore enabled by this process to take care of the production of the most rapid type of bagv forming mechanism.

Whatlclaimis: 1.. That step in the process of sealing the pasted bottoms of multiple wall paper bags which comprises advancing a' plurality of said bags inqa substantially continuous line sidewise over a sup! port with the several bags overlying each other in a shingled effect and with the pasted bottoms of the several bags superimposing'each' other and with the pasted bottom of each bag'folded underneath the bag and bringing pressure to bear upon the pasted bottom portions only of .the bags as they travel over the support.

' forming mechanism. Furthermore, this method- 2. That step in the process of sealing the interfolded pasted bottoms of paper bags which comprises, following the posting of the bottoms of the bags, delivering a succession of said bags in a substantially continuous stream with the bags moving endwise and with the pasted bottom of each bag folded underneath the bag into a substantially continuous moving stream of bags moving sidewise and arranged in an overlapping shingled relationship with the pasted bottoms of the bags overlying each,oth er and with each pasted bottom folded underneath its bag, and

bringing pressure to bear upon] the pasted bottoms of the bags as they are advanced sidewise in such substantially continuously. movingstream.

'3. Apparatus for sealing the pasted-bottoms of 'paper bags comprislngcontinuously advancing supporting means adapted to receive a succession of paper bags for sidewise advancement thereby,

to v

and continuously advancing pressure means superimposing said supporting means to exert a pressure upon that portion of the bags which rests directly upon the supporting means, said pressure means comprising a plurality of weighted members freely adjustable during their advance to adapt themselves to the formation of the paper bags therebeneath.

4. Apparatus for sealing the pasted ends 0 paper bags comprising a continuously advancing conveyor supported to withstand pressure from above while moving, bag/supporting means extending along parallel to such conveyor, means for delivering paper bags onto said conveyor for sidewise advancement thereby and continuously advancing pressure means superimposing said conveyor to exert a pressure upon the ends of the bags which rest directly upon the conveyor.

5. Apparatus for sealing the pasted bottoms of a. plurality of paper bags comprising a continuously advancing bag supporting conveyor supported to withstand pressure from above, bag

- supportingmeans extending along one side of said conveyor, means for delivering paper bags in a substantially continuous succession to said conveyor to lie crosswise thereover with the pasted bottoms of the bags resting directly upon the conveyor, and a continuously advancing pressure imposing conveyor superimposing said bag supporting conveyor to exert a pressure on the pasted bottoms of the bags resting directly upon said bag supporting conveyor.

6. Apparatus for sealing the pasted bottoms of multiple wall paper bags comprising a chain conveyor provided with a succession of rigid supports extending crosswise thereof, supporting means over which said conveyor travels to take the weight and pressure imposed thereon, means for delivering pasted paper bags to said conveyor bear upon the pasted bottoms of the bags resting .upon the chain conveyor, said blocks being pivotally suspended from said chain mechanism as they bear upon the'bags to adapt themselves to the formations assumed by the travelling bags.

'7. Apparatus for sealing the ,pasted bottoms of paper'bags comprising an endless chain conveyor provided with a closely spaced apart succession of transversely arranged rigid bag supporting blocks, supporting means over which the uppermost stretch of said conveyor travels, means for delivering pasted paper bags in a substantially continuously advancing stream to said endless conveyor to be carried along thereby with the pasted bottoms. of the bags resting directly upon said conveyor, a second endless chain structure superimposing saidchain conveyor and provided with a closely spaced succession of transversely arranged rigidly weighted blocks pivotally suspended from the chain structure and bearing directly upon the pasted bottoms of the bags carried by said conveyor, and counterweight mechanism adapted to act on each'block individually to press the same downward against delivering paper bags in asubstantially continuous succession to said conveyor to be carried thereby, and a continuously advancing weighted vancing e pressure from above and adapted to receive and carry a substantially continuous succession of means superimposing said bag supporting conveyor to exert a pressure on the pasted edges.

ment, and means for tensioning said endless conveyors whereby the pressure exerted on the paper bags during their'advancement is varied.

10. Apparatus for sealing the pasted edges of paper bags comprising a supporting conveyor upon which paper bags are deposited to be advanced thereby, a weighted means superimposing said conveyor and adapted to advance at a speed corresponding therewith, said advancing weighted means exerting a pressure on the pasted edges of paper bags throughout their advancement,

, and means for tensioning said weighted means whereby the pressure exerted on the paper bags by-said weighted means is varied. I

11. Apparatus for sealing the pasted,edges of paper bags comprising. a supporting conveyor upon which paper bags are deposited to be advanced thereby, a conveyor superimposing said supporting conveyor and carrying a plurality of weighted members adapted to bear downv upon the pasted edges of the-paper bags throughout their advancement, and means for varying the tension of said superimposing conveyor in order to vary the extent to which the weighted membersbear down upon the paper bags.

12. Apparatus for sealing the pasted edges of paper bags confprising a supporting conveyor upon which paper bags are deposited to be advanced thereby, a conveyor superimposing said supporting conveyor and carrying a plurality of self adjusting weighted members to bear down upon the pasted edges of the paper bags throughout their advancement, and a pressure exerting means operable to act upon each weighted member alone for a portion of its advancement to urge the same downward-to a greater extent than its own weight is capable of doing, each of said weighted members adapted to adjust itself to'the irregularities of the paper bags therebeneath as it bears down upon the same.

13. Apparatus for sealing the pasted bottoms of paper bags comprising a continuously ad ess conveyor adapted to withstand paper bags arranged in shingled overlapping relationship crosswise thereof with the pasted bottoms in alignment, an endless pressure conveyor arranged in opposed superimposed alignment to' said supporting conveyor, said pressure conveyor provided with a plurality of weighted pressure elements arranged in succession lengthwise thereof, and means adapted to successively engage said elements urging each element in succession toward the supporting conveyor.

14. That method of sealing the pasted, bottoms 4- I de s-2,503 w in alignment, bringing pressure to bear upon the pasted bottoms only of the bags and upon each bag individually during its advancement.

15. That method of sealing pasted bottoms of paper bags including advancing a. plurality of said bags sidewise upon a support in continuously moving succession and arranged with pasted bottoms in shingled overlapping relationship, bringing a plurality of pressure members to bear on the pasted bottom of each bag and advancing said pressure members in the same direction as the bags at substantially the same rate of travel to seal said pasted bottoms together.

' JOHN A. ROSMAIT;

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