US1156482A - Sack-stretching machine. - Google Patents

Description

A. V. JENSEN.

SACK STHETCHING MACHINE.

APPLICATION FILED DEC. I7, 1914.

Patented 001;. 12, 1915.

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SACK STRETCHING MACHINE.

APPLICATION FILED DEC. I7. I9I4.

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ALEXANDER v. JENSEN, or DEvILssLInE, Uren.

intense.,

resident of yDevils Slide, Morgan county',

Utah7 have invented certain new and useful :improvements in Sack-StretchingMachines, of which the following is a specification.

This invention relates to a machine for stretching sacks. and similar articles. In many industries the products are shipped in sacks and for business reasons certain standard sizes of ysacks have beendeterminedupon to contain certain fixed standard quantities of material measured by weight or volume, for example, cement is shipped in sacks supposed to contain ninety-five pounds of ce ment. Itis obvious, however, that if for any reason the sacks shrink, they cannot hold the required standard quantity of material and the result is, that sacks, otherwiseusable, are discarded and' thus represent a serious loss. Tn some instances a cement mill or other factory may have several hundreds of thousands of good sacks, which cannot be used because they have shrunk so'y much that they cannot hold the required quantity of material. The reasons' forr `the shrinkage `are several. Thus in the cement industry'the sacks are freouientlyy used as coverings for new work and are therefore exposed to the weather and moisture, and it has been found that even pre-shrinking the sacks is insufflcient because they become still more wet and shrink still further when yused on ythe work. Tf a large sack were used'and the required quantityfilled into it, the sack wouldY appear not filled, ywhich is not desirable and of course, this remedy would not yaffect the sacks now in usefor kdiscarded because'of the shrinkage. y

The object of this invention istherefore to provide a machine or apparatus for the stretching 'of sacks to standard or desired size in aneflicient manner whereby to avoid the loss due to shrunken sacks and whereby discarded sacks may again be usable. The economic advantages of such machine `or appar'atusare obvious iny viewof the "foref going explanation.y 7 Y i Withthis and other objects infview the invention'r is yembodied in a sack stretching machine as hereinafter gdescribed and claimed, and as illustrated the accompanying drawings in which; n "Figure" 1 is rear view of-abattery ,of sack stretchingimachines embodying the ine e Specification 'ofiLetters Yatent Patenten eet., ti2, relis.

Application filed December 17, 1914. Serial No. 877,660. i

vention and driveny from acommon source of power; Fig.,2 is a side yview looking from the yleft in Fig. 1; Fig; 3 is a front view 'or t view of the operators side of a singlema-y chine; and Figsf and 5 are detail views of the stretching` rolls. i i n i `Preferably several sack'y stretching .ma-k chines are mounted upon acommon framework and driven from a common source of power which in this instance is represented by the motor shaft 2 throughgears 3 and f1. The shaft2 is supported in suitable bearings on thefgeneral framework yor machine supporting means 5.

1 which drives a` main orline i The machines arealike and each one com- Vi prises a xed frame 6, 'in which there are ,f mountedtwo sack stretching rollers 7,y and 8.

The roll 7 is mounted in a fixed bearing9 at thetop of thev machine, while the roll 8 is mounted in a movable bearing 10 which Slides in the yopening 11 in the frame To each of the `rolls 7 and 8f there is secured` a gear 12 and 13 respectively which are driven inthe same 'direction by gears 14 and 15 meshing with said gears 12 and 13. gear llt is secured yto the upright shaft 16v andthe gear 15 is in drivingengagement with said shaft by a spline 17 or othersuitable means. The gear 15 is rotatably held to The the movable bearing 10 by suitable jaws 18 i operating Athe The upright shaft 1G is ournaled inbear- Y ings 23 and 2e and carries'a gear 25 which is driven from a gear 26 on the aforesaid main or line shaft 2. f

follows then scription that when line shaft 2Vdrives the-upright shafts 16 from which the rollers' 7 and 8 are rotated. When a sack i's to be stretched, it is' first i from the foregoing de-` the'motoris started the thoroughly soakedin water. Thereafter the y operator takes the sack, depresses the treadle 20, thereby lifting the roll 8 and decreasing the distance then slips they sack 100 over both rolls and lets goof the treadle. 'stretchedr like 'a belt over the rolls 7 and'f8 betweenthe rolls k7 and 8. yHe

The sack is rnow y `mounting the sack on the stretching rolls 2dov and supports the weight of the bearing l() and all the parts thereon. rIhis operation of may be performed whether the rolls 7 and 8 rotate or not. In either case the sack is easily mounted for stretching.

stretched by the weight of the lower roll and bearing l0 and is run over the rolls in the same manner in which abelt runs over its pulleysl and so that the fabric ofthe sack may be evenly stretched all around.V In case the weight of the lower Vroll 8 is not suf- 'cient to completely stretch the sack, a spring,-

30 may be used asv shown and which urges the bearingl downwardly, its upper coil acting against a washer 29 adjustably secured to the shaft 16 by a set screw 3l and whereby the tension of the spring may be adjusted., Preferably another spring V32 is used'beneath the bearing l0 to help Vbalance the force of the spring 30. The spring 32 acts against an adjustable washer 33.

Means are also provided whereby the operator is venabled to setl the lower roll 8 at a predetermined distance from` the upper roll 7 to stretch a sack to a certain size. Y On the framework 5 there is pivoted at 35 a gage plate 36 operable by means of .a handle 37. 0n vthe treadle is placed a stop 38. The gage plate may be marked as shown for different sizes of'sacks. It is obvious, that when the operator` takes his foot off` the treadle, the latter will move up under the weight of'roll 8 and bearing l0 acting on the lifting rod 22, until the stop 38 strikes against'the gage plate v36, and of course vthe roll 8 ycannot move down any farther. In this casethe springs 30 and 32 also assist in Yeasing the strain on the sack. Any suitable means for maintaining the gage Vplate in its various positionsmay be used and are not shown.

, vIn korder to properly and quickly f stretch the sack it is necessary that some means be employed to assist and furtherthe evaporationvof the liquid into which the sack was soaked before being mounted on the rolls. For this purpose heat is applied either directly or indirectly. If the latter method is preferred, the operation may take place in warm room andblasts of hot air may be directed toward the sack while it is onthe rolls. lItis not necessaryto illustrate apparatusfor this purpose, as it is similar to that which' is used for the operation of socalled drying'rooms and wellpknown. I

prefer, however, the application of direct heating means as accomplishing the result most quickly and economically. Referring to F ig. 4 which shows a construction suitable for drying the sacks by means of electricity applied to` a heating coil, the stretching roll is shown provided with a socket member 39 of insulating kmaterial and provided with When the operator lets goof the treadle the sack is" lating material.

yinsulated from the roll which preferably is made from steel tubing. The heating eleyment comprises a hollow cylindrical base 44 provided with heads 45 and 46,"all of i'nsun VThe head 46 is provided with two contact pins 47 and 48 adapted to be thrust into the contact sockets 40 and 4l. The terminals of the heating coil 49 are connected to the contacts 47 and 48. Thus itrwill be observed that the heating element is detachable from the roll `as shown in Fig.

4. In order to connect the coil 49, the-heat? ing element is moved fully into the roll when thecontactpins will enter the contact sockets. lurrent is supplied to lthe commutator rings by brushes 50 and 5l to which the cables 52 from a suitable source of current are connected. The shaft 55 for driving thev roll is connected to the latter by Y screws or pins and is cut out as at- 56, 56,

to leave room for the wirestto the commutator rings.

In case steam is'preferred, or hot water,

used, in which `6() represents a suitable supthe construction shown inTig. 5 may be f portingv means for the stationary steam pipes 6l which pass through the shaft 55 and into the roll forming a suitable steam coil 62.V In either case it will be observed that the, sack will be heated while being stretched so that the operation will take but a short time. c

The machine as here described is very simpleand easily operated. One man can attend to a battery of machines and manipulate eachcmachine independently of the others by Ysimply operating `the. treadle, thereby working the rolls without stopping their rotation, nor necessitatingv cuttingoff the heat.,

kIt will be seen that the machine comprises suitable stretching means together with means for heating the same and the necessary adjusting mechanisms. v'

.Details in the construction mayvary and I do not intend limiting my invention to v the precise disclosure, nor to the stretching of sacks only, but I claim all such modications as properly come within the principle Of the invention andthe scope of the apsV pended claims.

`Iclaimv: Y Vl'. In a sack stretching machine the combination of a `pair of rolls adapted to receive the sack to be stretched, meansl for :heating said rolls, means for Voperating one of the rolls toward and away from they other roll and means for rotating the rolls. 2. In a sack stretching machine, the combination of a pair of rolls adapted to receive the sack to be stretched,means for-heating Y said rolls, means for rotating said'rolls inf inside the ysack and whilesaid rolls are ro tated.

3. In a sack stretching machine, the combination of a plurality of pairs of rolls, each pair being adapted to receive a sack to be stretched, means for operatingthe one rol. in each pair of rolls independently of the other pairs oit' rolls to permit a sack to be drawn over said pair, means for hea-ting the rolls and means for rotating the same.V

d. In a sack stretching machine the combination of a pair of rolls adapted to receive the sack to be stretched, one of said rolls being operable toward and away from the other roll7 means for adjusting the extent of the movement of the one roll away from the other roll and means for operating the said rolls.

5. ln a sack stretching machine the combination of a pair of rolls adapted to receive the sack to be stretched, one of said rolls being operable toward and away from the other roll, means fory adjusting the extent of the movement of the said one roll and means for operating the rolls. f

G. In a sack stretching machine the coinbination of, a pair of rolls adapted to receive the sack to be stretched, means for diminishing the distance between the rolls for drawing the sack upon the same, means for operating one ot' said rolls away from the other roll to stretch the sack, means for limiting the movement of the said one roll, means for heating the rolls and means Afor rotating the same.

7. In a sack stretching machine the combination of a frame, a stationary roll mounted to rotate therein, a movable bearing opies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, s

mounted to slide in said frame, ra second roll mounted to rotate in said bearing, means i for moving the said bearing toward the said stationary 'roll to diminish the distancer between the said rolls for drawing a sack upon the same, means for rotating the said rolls and a spring for forcing the said bearingv and the said second roll away from the said iirst roll to stretch the sack upon the rolls.

8. In a sack stretching machine the combination of a frame, a stationary roll mounted to rotate therein, a. movable bearing mounted to slide in said frame, a second roll mounted to rotate in said bearing, means Jfor moving theA said bearing toward the said stationary roll to diminish the distance between the said rolls for drawing a sack upon the same, means for rotating the said rolls and a spring for forcing the said bearing, and the said second roll Vaway from the said first roll to stretch the sack upon the rolls, and means for heating the latter.

9. In a sack stretching machine the conibination of a plurality of pairs of rolls, each pair being adapted to receive a sack to be stretched, means for operating the one roll in each pair of rolls independently of the other pairs of lrolls to permit a sack to be drawn over said pair, means for increasing the distance between the rolls in each pair of rolls independently of the other pairs, means for heating said rolls and driving means for rotating all of the said rolls.

Signed at Devils Slide, Morgan Co., this 9th day of December7 1914.

ALEXANDER V. JENSEN.

Vitnesses:

T. L. BALL, EDWIN A. WILDE.

c Washington, D. C.

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