US2410731A - Bag turner - Google Patents

Description

4 Sheets-Sheet l iwi Si@ B. A. HANNEWLD lAL BAG TURNER Filed Nov. 8, 1945 Nov. 5, 1946.

Nov. 5, 1946. B A, HANNEWALD ETAL 2,410,731

BAG TURNER 4 Sheets-Sheet 2 Filed Nov. 8, 1945 N0V- 5, 1946. B. A. HANNEWALD ETAL M0531 BAG TURNER Filed Nov. 8, 1945 4 sheets-sheet 4 Patented Nov. 5, 1946 UNITED STATES PATENT oEEicE BAG TURNER Burton A. Hannewald, Joseph J. Lee, and James M. Wheatley, Indianapolis, Ind., assignors to Bemis Bro. Bag Company, St. Louis, Mo., a corporation of Missouri Application NovemberS, 1945, Serial No. 627,402

10 claims. 1

This invention relates to bag turners, and

with regard to certain more specific features, to

so-called stick turners, particularly for turning` paratus of the class described which may readily be adapted to bag turning apparatus now in use. Other objects willbe in part obvious andin part pointed out hereinafter.

The invention accordingly comprises the ele- "ments and combinations of elements, features of construction, and arrangements of parts which vwill be exemplified in the structures hereinafter described, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which one of various possible embodiments of the invention is illustrated,

b Figui is a side elevation showing substantially an' entire bag turning apparatus to which the invention is applied;

Fig. 2 is a plan view of Fig. 1;

Fig. 3 is an enlarged detail plan View of significant portions ci Fig. 2 shown in a retracted position;

Fig. 4 is a view similar to Fig. 3 showing the parts in an advanced position;

Fig. 5 is a fragmentary detail showing certain turning` sticks feeding a bag into take-oli means;

Fig. 6 is a diagrammatic view of parts set according to Fig. 3 but illustrating preliminary operations on a bag; y

Fig. 7 is a front elevation of Fig. 6;

Fig. 8 is a View similar to Fig. 6 but showing an advanced position of parts;

Fig. 9 is a front elevation of Fig. 8;

Fig. 10 is a view similar to Fig. 'K8 but showing a still further advanced position of parts; and,

Fig. 11 is a front elevation of Fig. 10.

Similar reference characters indicate corresponding parts throughout the several views of the drawings.

VSo-'called stick types of turning machines have been used for bag turning. In these a bag mouth is applied overv several sticks, usually four. These sticks are then spread apart by pairs and additional reciprocating sticks are then driven against the bottoms of the bags to push these through the mouths so as to turn the bags inside out. By inside out is meant that bags which are manufactured with` their rough seams outsideA are turned so as to place these rough seams inside. In general, two reciprocating turning sticks are used located quite close to the bag edges. These drive the bag bottoms through their mouths. The purpose of this is to produce a flat turned bag. This former scheme is satisfactory for bags which bear no inside labels or the like prior to turning. Such bags in general have the labels applied after turning.

According to said two applications above mentioned by number, and as further indicated herein, some bags are now made with a girthwise labeling band or the like applied to the fabric before the bag is formed. When the bag is sewn this band or label is on the inside. When such bags are applied to the old turners, the turning sticks operating quite close to the bag edges tend to buckle the bag fabric at these points, and consequently also the labels. The buckling is quite sharp, particularly at the bag edges. Since the stated labels have portions at the bag edges, they also are turned quite sharply and there is some tendency to tear, crack or break these so that they 'become disgured in their iinal outside positions.

`Thepresent invention overcomes this diiculty in respect to this class of labeled bags.

Referring now more particularly to Fig. 1, there is shown at numeral I a frame on whichare guide rails 3 for a reciprocating carriage 5. In the frame I is a rotary crankshaft v'I carrying a crank 9 (counterweightedv at I0) which through a connecting rod Il oscillates a lever I3 pivoted at I5 in the frame I. Shaft 1 is driven from a power shaft 8 through a gear train 4I, 39. The

lever I3 carries a grooved sector I'I, the outer Ycircular'face of which is centered at I5. Looped over a forward edge I9 vof the sector Il and fastened at ZI is a cable 23 which passes tangentially off to the rear from the sector and is attachedvat 25 to the rear end of the carriage 5. Likewise, there is looped over a rear portion 21 of the sector I'I and fastened at 29 a cable l-II Vwhich passes tangentially from the sector forwardly to a fastening 33 at thefront'end of the carriage 5. Thus upon rotation of the crank 9 and oscillation of the lever I3, along with the oscillation of the sector Il, the carriage 5 may be reciprocated on the guide rails 3. The stroke vmay beadjusted by adjusting theposition of the with attachnients on the carriage 5.

pin joint between the connecting rod II and the lever I3 in one of several holes such as shown at 35, thus accommodating the stroke to various lengths of bags.

On the said shaft 8 is also a gear 43 which drives apinion-45. The latter- drives gears 41 and 49 for driving a set of draw rolls 48 and 50 receiving between them turned bags.

In front of the rolls 48 and 59 are mounted rolls 52 and 54, respectively. Belts 56 overY the respective pairs of rolls 50, 54 and 48, 52 move in the direction shown in Fig. 11. to receive turned bags and eject them from the machine. A suitable belt shifter mechanism may be used for the belts 56 to adjust them laterally on the rolls to accommodate them to various bag widths, but since this shifter forms no part of the present invention, it is not shown nor further described'.

On the shaft 'I is a cam 58 which bears against Ha.,follower roll 50, the latter being carried upon 4.alever 62 pivoted at 64. Pinned at 66 at the Qe'ndofi the lever 62 is a connecting rod 53'. At the therend the rod 53" is pivoted at 6| to rocking lever 55. Pivoted at 68 on the lever 55v is a rod IUwhich at its outer end' slides throughv an eye 4T2 on the frame I. A spring 'I4 vreacting from theframe and against a collar' 'I6 carried on the rb'd I0H serves to bias the driving linkage for the lever 55 so that the follower 60is held against thelcarn 5B. Lever 55 is carried on a rock shaft 5l on which also. are held two lower spreaders 59. On xed shaft V80, above the spreadeis 59 are two upper, non-rocking spreaders 63. By a'known suitable ,meananot shown, the members of the respective pairs o'f`sprea'ders 59` and 63 may be adjusted' to various llateral ydistances forr accommodation to .various bag widths.H The shafts 51and 80 are carried upon a support A82. A platen 84 extends from this support toward vthe rolls l52 and' 54. A able |355 is positioned above the frame I`behind lthe Asupport 82. n

The parts above described are old and further description will be`unn`ecessary. The improvements herein described have toV do particularly l Rfi'- now moreparticularly to Figs. 3-11, the carriageSfha's rigidly Amounte'don -it` a crossbar 65 whi Ih is a T-slot 6l. Along it are index marks 'tai' *m the att `e1 are 'adjustable' 'r-tetda 'Studs 'I`| which may be loosened and tightened art any desiredpositionalong the slot S'I. l'Ihesefloolts 'llferm rivets ,for latral. 'SiSeeiegflmeeSlks -'i3. Thesne sticks swing-inlY a horizontal plane.

nacnsuckihas/ attached to it a b1`ock1'5whijch has apivoted 4connectionli with ahead V|91v Each head ,"|9 is'icarriedwonfthe end s oi" apair oilrigid Y10a-rsV .8l extending from a 511016,83- Eeh ,Slide has laV suitable extension in a guide Slot 35. at the respective end of, aseond cross guide4 87A of. the @arriesga ivoiedoneeees. 89 .Serve t@ G011- .riveted at Y95: to the, Carriage, 5f. Ari .extension arcieri, frein the rocker .93 Provides meses-.ier k0,sci1,1ai1ins the ro =ker1-Tliis lexteesoneiml et ,its 4outer VendVV carriesajroltfollower 99 Awhich cillated and cause' opposite 1reciprocatin'g mol tions of the slides ss in the guide slots 85. They heads I9 being rigidly connected with the slides 83 will cause properly timed rocking actions of the turning sticks 'I3' in the horizontal plane about the pivots '|I.

` At numeral I 69 is shown a central turning stick which is slidable longitudinally in bearings III and ||3. The iront portion of the stick is round in bearing |i| and square in bearing ||3, thus preventing it from turning indiscriminately on its axis. Pivoted at ||5 on the stick |09 is an oscillating block which ts in the forked end |fI-.9.of a bell crank I2 i. This bell crank is pivoted f at |23 to anextension part |25 of the carriage 5.

One` leg of the bell crank carries a roll follower |27 which operates in a groove |29 of a second track |31, also attached to the frame This track |31' has an oiiset |33 (Figs. 3 and 4) which upon reciprocation of the carriage 5 provides swinging movement Aof the bell crank |2I with respect to the carriage. This movement is of an oscillating character and atf a predetermined point in the travel of the carriage 5 causes rela.- tive axial advance or retraction of the stick |09 with respect to the carriage.

Operation is as follows:

Rotation of the shaft l turns the crank 9 which through connecting rod oscillates the rocker I5 and the sector Thus the carriage 5 is reciprocated by the exible connections 23 and 3|. The cam 58 drives the follower 60 which, through the lever 62 and' rod 53, oscillates the lever 55. This oscillates the lower set of spread- Vers 59. The upper spreaders63 remain Xed.

Also, through the gear train 43, 4I and 49 is eiected turning of the rolls 59, 48 and movement of the belts 55. Adjacent belt reaches move from the apron 94 toward'theV outlet of the machine. n Assuming that the carriage 5 is retracted to the right as far as possible (see Fig. 3), the lower spreaders59` become raised so that they are close to the spreaders S3. The operator slides the open mouth of a bagover the spreaders 63 and 59, the body' portion of the bag resting on table |35. This is done at the time that the carriage 5 is about to advance to the left.

As the carriage 5 begins to move forward, the spreaders 59 are caused to be withdrawn from the spreaders 53 so as to hold the mouth of the bag' open and taut, providing an opening through which the body of the bag may be pushed to turn itinside out.

As the carriage advancesthe turning sticks 'I3 are together as shown in Fig. 3 with the end |39 of stick |09 in advanced position of ends |31 on the vsticks 13. A. substantial lead of stick |09 relative to sticks 'I3 is maintained during the early part of the travel.

The conditions are diagrammed in Figs. 6v to V1l. As-the carriage 5Y advances the ball end |39 of the central turning stick. |09 enters the center of one side of the bag and starts turning the bag inside ont from its center (Figs. 6 and '7). AS turning proceeds (Figs. 8 and 9) the sticks 'I3 follow in, at rst without spreading. The lead of stick |09 is maintained. As the action continues the bag turns inside out at the center so that most of the inside label band |4| has been turned by a pull onA the fabric from. the center,

as caused by the central stick |09., By first pushing the bag through its mouth by acentralpush as described, the label -band |4| is. bent withI the leastbuckling. It should be noted that this band fis.generally made of paperA attached by means of paste to the insideof Vthe bag, which is vmade of fabric. Therefore this gentle initial central turning action is doubly important.

' After most or all of the label has been turned by the central stick |99, the follower 99 reaches vthe offset |05 in groove IUI. This causes a clockwise rotation of the rocker 93 with a spreading of the slides 83 in the guides 85. This causes spreading of the pivots 11 and angling out of the lateral turning sticks 13. Thus these sticks take over the turning action after the danger to the label strip has passed. Turning is then completed by the sticks 13 (see Figs. 5, 10 and 1l), which in spreading also flatten out the bag being turned. At the time that the turning action is taken over by the sticks 13, the follower |21 reaches the offset |33 in groove |29, which causes the bell crank |2| to rotate clockwise relative to the carriage 5. This causes retraction of the central stick |99 with respect to the carriage. Thus the central stick |99 loses ground with respect to forward movement of the sticks 13 and the turning is completed by the spread sticks 13. The ends |31 of these sticks feed the bottom end of Athe bag between the belts 53, which frictionally grasp the bag and feed it out of the machine from the platen 34. It will be noted that reciprocation of the turning sticks 13 and |99 is -just above said platen 84.

It may be noted that the timing is such that as the bag reaches the end of the turning operation with its turned bottom near the belts 56, the lower spreaders 59 ibegin to rise so as to loosen the grip of all of the spreaders 59 and "93 on the bag mouth. Hence continued forward motion of the sticks 13 serves to strip the turned mouth of the bag from the ends of the spreaders 59 and 63. The ends of these spreaders are rounded so that this stripping action occurs Without damage to the bag, The stripping action continues as the turned bottoms of the bags are fed in between the belts 56. Thus the bags are flattened throughout their lengths.

It will be understood that it is not desirable to continue the turning operation at the center by means of the ball |39 in advance of the ends |31 Y after the label has been satisfactorily either partially or completely turned. This is because the ball |39 might tend to punch a hole in the bottom of the bag if the timing of the action of spreaders 59 were not perfect. Therefore it is desirable during the final part of the turning operation as described to have the ball head |39 fall back relatively to the ends |31 until the ball is at least not substantially in advance of said ends |31. In other words, the ball |39 in the final stages of turning may be about between the ends |31 or behind them.

After the carriage 5 has reached the left-hand end of its trovel, the sector |1 oscillates back and retracts it. This causes a reverse order of the events above described and the withdrawal of the sticks into position under the table I5. At the time that the carriage 5 has retracted to the right its maximum distance, the operator applies another -bag to the spreaders 59 and 63, which at this time have gone back to their non-spreading positions close to one another.

Advantages of the invention include the broad one stated, which is a starting of the turning action of the bag by means of a centrally applied turning stick which causes the easiest possible bending action on the materials of the inside paper or like attached label. Then as the functions of this central stick have been accomplished, the advancing, separating sticks 13 take over and 6 complete the turning in such a way as to present the turned bags flatwise into the belts 56 for delivery from the machine in desirable iiat turned condition.

Another advantage of the invention is that it is easily applicable to present-day horizontal-table turners such as outlined, since all that is required is the addition of the track |3| and the following equipment on the cariage 15, such as the bell crank |12| and the central sliding turning stick In view of the above, it -will be seen that the several objects of the invention are achieved and other advantageous results attained.

As many changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

We claim:

l, An improvement in a bag turner having a reciprocating carriage which reciprocates a pair of oppositely located turning sticks; comprising a third turning stick loacted between said pair of sticks, bearing means on the carriage for supporting the third stick movably with .respect to the carriage and parallel to its line of reciprocation, and means for moving said third stick relative to the carriage first so that its end is in advance of the ends of said pair of sticks and thereafter retracting with respect to the ends of said pair of sticks.

2. An improvement in a bag turner having a longitudinally reciprocating carriage which moves a pair of oppositely located turning sticks, the latter operating edgewise on bags; comprising a third turning stick located centrally with respect to said pair of sticks, bearing means on the carriage for supporting the third stick movably with respect to the carriage and parallel to its line of reciprocation, and means for moving said third stick longitudinally relative to the carriage first so that its end is in advance of the ends of said pair of sticks as the carriage starts a forward movement, and as the carriage nears the end of its forward movement retracting said third stick 'with respect to the ends of said pair of sticks until the end of the third stick is near or behind a line joining the ends of said pair of sticks.

3. An improvement in a bag turner having a reciprocating carriage which moves a pair of oppositely located turning sticks, the latter entering bags and spreading to operate edgewise on bags; comprising a third turning stick located in a plane substantially central with respect to the plane of spreading of said pair of sticks, bearing means on the carriage for supporting the third stick movably with respect to the carriage and parallel to its line of reciprocation, and means yfor moving said third stick longitudinally relative to the carriage so that its end is in advance of the ends of said pair of sticks as the carriage starts a forward movement, and as the carriage nears the ends of its forward movement and said pair of sticks spread retracting said third stick with respect to the spread ends of said pair of sticks until the end of the third stick is near or behind a line joining the ends of said pair of spread sticks.

4. In a bag turner having a reciprocating carriage adapted to advance and retract and having a pair of lateral and longitudinal turning sticks on the carriage; comprising a central longitudinal turning stick movable longitudinally with the carriage and relatively thereto, means responsive to the movement of the carriage 'for rst maintain- Ving the end of the central stick in advance 'of the ends of the lateral sticks during an initialpart of the carriage advance, vsaid means being Aadapted relatively to retract the end of said central stick with respect to the lateral sticks during further advance movement of the carriage.

5. In a bag turner having a reciprocating carriage adapted to advance and retract and hav-ing a pair of lateral and longitudinal turning sticks on the carriage, said sticks spreading upon advance of the carriage; comprising a central longitudinal turning stock movable longitudinally with. the carriage and relatively thereto, means responsive to the movement of the carriage for iirst maintaining the end of the centralstick in advance of the ends of the lateral sticks during an initial part of the carriage advance and before said sticks spread, said means being adapted relatively to retract the endof said central stick with respect to the lateral sticks during further advance movement of the carriage and as said pair of sticks spread.

6. In vbag turning apparatus having a reciproeating carriage adapted to be advanced and retracted, and said carriage having longitudinal and laterally located turning sticks, the ends of which yare adapted to be spread during the nal period of the carriage advance; comprising a central longitudinal turning stick longitudinally movable on the carriage, means responsive to at least to Ya point approximately between the ends of said lateral sticks.

7. An attachment for bag turning apparatus Ahaving a reciprocating carriage adapted to advance and retract, said can'iage having lateral turning sticks advancing and` retracting therewith; comprising a central longitudinal stick longitudinally movable on and with respect to the carriage, a. rocking means pivoted to the carriage and cooperating with said central stick to move it in respect to the carriage, a follower carried by said rocker, and a cam. track stationary with respect to the carriage and `engaged by said follower, said tra-ck being shaped `to cause movement of the rocker vin response to carriage movement, said track being shaped Vso that uponinitial advance of the carriage the end ofthe central turning stick is located ahead of the ends of the lateral turning sticks and during nai carriage advance said central turning stick m retracted to a .position not substantially in advance of .the said ends of the `lateral sticks.

8. An attachment for bag turning apparatus having a, reciprocating carriage adapted to advance and retract, said .carriage having a pair of lateral turning sticks advancing and retracting therewith and having yends which spread as the advance progresses; comprising :a central '1on- `gituclinal stick longitudinally movable on and with respect to the carriage, a rocking means pivoted to the carriage and cooperating with said central stick to move it in respect tothe carriage, a follower carried by said rocker, and a cam track stationary with respect to the carriagey and engaged by said follower, said track being shaped to move the rocker in response to carriage movement to move the rocker with respect to the carriage, said track being shaped so that upon initial advance of the carriage and before spreading of said pair of sticks the end of the central turning stick is located ahead of the ends of said pair of turning sticks and during further carriage advance said central turning stick is retracted to a position not substantially in advance of the then spread ends of said pair of sticks.

9. An attachment for a bag turner having a reciprocating carriage adapted to advance `and retract, said carriage having pivoted thereon lateral turning sticks mounted to move with the carriage and to angle their` ends away fro-m one another during carriage advance; comprising a central longitudinal turning stick mounted on the .carriage to move therewith and relatively thereto, a rocker pivoted to the carriage and cooperating with the lcentral turning stick to move the saine relatively to the carriage, a 4follower carried by the rocker, a stationary cam track xed with respect to the carriage and cooperating with said follower, said cam track being shaped so that upon initial advance of the carriage the end of the central turning stick moves with the .carriage in advance of the ends of said lateral turning sticks before said last-named ends separate, said cam track during the nal advance .movement of the carriage when the ends of the lateral sticks separate causing the advance end of .said central turning stick to Abe retracted to a position substantially between said lateral turning vsticks in their advance in the separated conditions of their ends.

10. An attachment for a two-stick bag turner .having a reciprocating carriage upon which said sticks are mounted for advance and retraction of the ends of the sticks; comprising a central stick mounted on the Ycarriage for movement therewith and longitudinally relatively thereto, a bell crank .pivoted to the carriage, one arm of the bell crank having a forked connection with said central stick for moving the stick longitudinally with Yrespect to the carriage, said bell crank having a second arm, a follower on said second arm, a stationary cam track adjacent to the .path of motion of .the carriage and .cooperating with said follower., said cam track having a straight portion therein arranged to control said follower to hold the bell crank in a position wherein during initial advance movement ofthe carriage the end of said central turning stick protrudes .beyond the lends of said lateral sticks, 'said vtrack having an oiset located so that at a .predetermined time in the advance movement of the carriage said end of `the central stick is retracted to .a position .more nearly adjacent to the ends .of .said lateral sticks as the Ycarriage finishes its advance.

BURTON iA. HANNEWALD. JOSEPH J. LEE. JAMES M. WHEA'ILEY.

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