US2273585A - Apparatus for forming siftproof bag closures - Google Patents

Description

" Feb. 17, 1942. I Q J E 2,273,585

APPARATUS FOR FORMING SIFTPROOF BAG CLOSURES Filed May 22, 1940 2 Sheets-Sheet 1 ATTdhNEY F8). -17, 1942. 1', MQQRE 2,273,585 APPARATUsfoR FORMING SIFTPROOF BAG CLOSURES Filed May 22, 1940 2 Sheets-Sheet 2 lNVENTOR .fqyai i2 7%002'e BY i,

Patented Feb. 17, 1942 UNITED 'sTATEs PATENT, OFFICE APPARATUS FOR FORMING SIFTPROOF BAG OLOSUBES Royal '1'. Moore, Buffalo, N. r., assignor to consolidated Packaging Machinery Corporation, a corporation of New York Application May 22, 1940, Serial No. 336,504

9Claims.

This invention relatesto new and useful improvements in bag closing mechanisms generally, and particularly seeks to provide novel sealing means for forming and sealing bag tops of the single panel fold type.

Paper bags having top closures of the single panel fold type are apt to permit a certain degree of sifting since the line of fold of the top panel may not be closely formed, thereby providing passageway for sitting of material contained within the bags from the mouths thereof.

It has been found that such sifting tendencies can be virtually eliminated by more sharply defining the line of fold of the top panel and by providing -a short sharply creased marginal return fold at the bag mouth which is covered by the top fiap and sealed by the adhesive.

Therefore it is an object of this invention to provide a bag closing machine with means to form a single panel fold bag closure having a pre-formed sharply creased marginal return fold adjacent the bag mouth and underlying the top panel in the sealed position.

Another object of the invention is to provide a device of the character stated which can be used in conjunction with either trimmed or untrimmed bags.

Another object of the invention is to provide a device of the character stated in which the creasing means includes a pair of opposed relatively movable elements comprisinga creasing blade and a gripper element adapted to receive and pinch the crease formed by the creasing blade to thereby sharply define a marginal return fold.

Another object of the invention is to provide a device of the character stated in which the marginal return fold of the bag closure is first positively formed by the creasing means and then positively tucked into closure-forming position by a tucker blade. Another object of the invention is to, provide a device of the character stated which will form I an adhesively sealed single panel fold closure for paper bass.

Another object of the invention is provide a device of the character stated which is simple in design, rugged in construction, and economical to manufacture.

With these and other objects in view. the nature of which will become more apparent, the invention will be more fully understood by reference to the drawings, the accompanying detailed description, and the appended claims.

In the drawings:

Fig. l is a fragmentary vertical transverse section showing the crease forming and initial folding mechanism;

Fig. 2 is an enlarged fragmentary detail view A showing the first step of crease forming;

Fig. 3 is a view similar to Fig. 2, but showing the parts in disengagedrelationand the gripper H firmly holding the marginal return fold;

Fig. 4 is a fragmentary vertical transverse sec-- tion showing the gluing and shaping mechanism together with the final folding and pressing mechanism; v Fig. 5 is an enlarged detail elevation of a portion of the creasing mechanism shown in Fig. 1;

Figs. 6, 7 and 8diagrammatically illustrate the with end trimming mechanism.

The present invention is directed specifically to improvements in mechanisms for creasing, folding and sealing a single panel fold bagclosure of the kind formed through the useofa bag closing machine such as is disclosed in the United States Letters Patent No, 2,175,557, issued to R. N. Cundall on October 10, 1939. Since thesubiect matter of this invention employs driving mechanisms similar to those disclosed in the above referred to patent, it is believed unnecessary to herein illustrate the entire machine, and reierencemay be made to the patent referred to for a clear and complete disclosure of such driving mechanisms.

For convenience in reference, the machine parts of this structure that are identical with the machine parts of the patented structure are given the same reference characters as appear in the patent drawings, and the machine parts included in this invention are designated by refvention are applied to the first operating station as illustrated in Fig. l of the drawings. A creasing blade I having a V-shaped leading edge It is rigidly secured to the machinefram. A plate 201 which is mounted for slidingmovement between suitable bearing blocks (not shown) is formed in the creasing blade "I. The plate 2.1

. fixed to the upper ends of a yoke 2I3 pivotally carried at the ends of the pivot 209.

A spring 2 extends from the yoke to the lower surface of the plate 201 and tends to main-' tain the yoke at right angles to the plate and thereby holds the folding member 2I2 against the lower surface of the creasing blade. A bolt 2I5, carried by a rigidly mounted bar 225, extends through an opening in the yoke 2I3 and carries adjustable lock nuts 2 I 1 forming an abutment against which the yoke strikes near the end of the forward movement of the plate 201. Continu'ed movement of the plate 261 causes the yoke to rock against the tension of the spring 2 and thereby causes the folding member 2I2 to drop downward into its position shown in full llneinFlgJs a The plate 201 is reciprocated through the medium of a link 2I6, one end of whichis pivotally attached to the rod 209 and'the other end of which is pivotally attached to one arm of a bell crank 2I1' journalled on a shaft I36. The other arm of the bell crank is attached to a pitman 2" adapted to be reciprocated in opposite directions by camand follower connections generally indicated at'220.

A crease anvil I3 having a crease-receiving groove I4 formed across the face thereof is rigidly secured to the machine frame and is located with the groove I4 thereof disposed substantially in the vertical. planeof the upper crease-forming blade edge II'.

p A creasing assembly I5 which cooperates with the blade l and anvil I3 to form spaced parallel I oppositely directed creases, is carried by one end of a swinging arm 23I, the other end of which is pivotally mounted on a cross rod I36. The arm .23I is oscillated through the medium of link, pitman and toggle connections 232, 233 and 236, re-

spectively, and which are in turn drivenby cam and follower 231. The creasing assembly 16 includes a, block I6 connections generally indicated at having a relatively thin rearwardly extendingtongue I1- formed integral therewith andadapted to, be received by the groove I4 of the anvil in crease-forming relation. A rearwardly projecting and transversely extending bar I6, formed integral with'the. block I6, is disposed in spaced relation to the tongue I1 and is-provided with a beveled upper face I 9 substantially parallel to the opposing face of the'creasing blade III. It should be noted, that the upper face of the block I6 and the lower face of the crease blade III are disposed in substantially coplanarrelation in r the creasing position.

A plate 20 having a beveled rear edge portion 20a overlies the upper face of the mounting block and is pivotally-connected thereto adjacent The plate 20 is by a compression spring 22 carried in a well 23 formed in the block, and is limited in its outward movement by a bolt 24 having a rounded head 25 extending through the plate 20, the spring 22,

and the block.

After the creasing assembly I and .the complementary creasing elements Ill and I 3 have been brought into the crease forming position see Fig. 2) by the cam and follower connections being separated as the result of continued movement of the cam and follower connections (see Fig. 3), the plate 20 is forced downwardly by the action of a pressure roller 26 riding over the rounded head 25 of the bolt 24 to thereby forcibly bend the lip of the bag closure as the flap is folded over and provide the closure with a relatively narrow marginal return fold 21.

The roller 26 is carried by one end of an arm 28 pivotally mounted on the rod I36 and which is adapted to be oscillated through the medium of a link 29, a bell crank 30, and pitman 3|. The pitman is given a movement of reciprocation by cam and follower connections generally indicated at 30'. Continued movement of the cam and follower connections 30, causes the roller 26 to become disengaged from the bolt head 25, and consequently the plate 20 is permitted to rise under the influence of the spring 22 and release the fold.

The bag is then moved by feed means (not shown) to the gluing, final folding, and pressing station as indicated in Fig. 4.

At this station it will be seen that there is a folding and pressing member 265 mounted across the ends of spaced arms 266 movable in guideways 261. A rod 268 passing through the arms 7 266 at the rear thereof, extends into slots 266 (indicated in dotted lines) in the guides. The arms 266 are provided with depending cam portions 3| which are engageable with surfaces 212 of the guides 261 and control the vertical movement of the free end of the member 265. A bar a 213, extending across the arms 266, provides support for a bail 214 to which is attached a link 215 extending from a bell crank 216 mounted on the cross rod I36. The other arm of the bell crank a rearmost portion of the member comes down to press against the closure.

The member 265 is provided with a channelshaped upper end 290 corresponding to the hooked fingers of a person's hand and slopes" downwardly from the, end somewhat after the fashion of the palm of a hand and then horil zonta y to correspond to te heel of a hand. .The channel-shaped portion 290 is preferably provided with a flaring mouth to insure guidance of the previously, folded bag mouth into the channel. As the member 265 moves forwardits action infolding and pressing the mouth of the I bagagainst the shoulders of the bag is almost exactly :the action ofa persons hand performing the same function. A glue blade 3", receiving adhesive through the mediumof devices not shown, is mounted on a pivoted bail 3 and carried at the ends of spaced levers 3 I 2. The glue blade is resilient and extendsangularly forward and downward so as ,5 toexert a yielding wiping pressure against the shoulder of the bag as it applies adhesive thereto.

A tucking blade 320 (Fig. 4) carried by resilient fingers mounted on bar 3 extends forward above the glue blade and engages the folded edge of the bag as the glue blade moves inward to insure tucking of the mouth of the bag into the fold. The member 265 is provided with fins 29I 331, and as the respective creasing assemblies are 15 which not only depress the tucking blade to insure a tight fold but prevent the blade from snapping upward when released, thereby protecting the resilient fingers. It should be noted that the end of the tucker blade 320 engages the extreme end portion of the pre-folded marginal re turn flap portion 21, and presses it firmly against the top flap portion of the closure so that chan- Jnel shaped portion 290 of the member 265 and the heel portion thereof may form the flap into a tightly sealed closure as indicatedin Fig. 8 of the drawings. a

In Figs. 6, 7 and 8 of the drawings there is diagrammatically illustrated the operation of the machine at the gluing, final folding, and pressing station. Fig. 6 shows a bag after it has left the creasing station and with the crease 32 and the return marginal fold 21 formed in theolosure flap. Fig. 7 shows the bag as it arrives beneath the member 265 with the glue blade llll applying adhesive to the bag shoulder, and the device adapted to form a crease in the collapsed mouth of a bag a certain distance above the emclosed contents, a second creasing device operative beyond said first device and simultaneously therewith and adapted to form a relatively narrow marginal return fold adjacent the extreme end of said collapsed bag mouth, means movable transversely of thecreasedend of the bag to fold the end of the bag oncej'upon itself along said first mentioned crease, means to apply adhesive to a portion of the bag. and -means including a member movable to exert sliding pressure upon the folded end, of the bag to press the same upon the adhesive bearing portion thereof. r v

3. In a filled bag closlng'finachine, an operating station comprising a creasing deviceadapted to form a crease in'the collapsed mouth of a bag a'certain distanceabove the enclosed contents,

tucker blade 320 engaging the end portion of the.

return fold 21. Fig.8 shows the final position of the member 265 pressing the closure to effect a' tight seal. It should be noted that the return fold 21 is tucked tightly'into the crease where'the closure folds over the bag shoulder and is embedded in adhesive, thereby effecting a well bonded seal.

In Fig. 9 of the drawings there is illustrated a modification of the creasing means which may be employed when the bag ends are to be trimmed.

a second creasing device operative beyond said first device and simultaneously therewith and "adapted to mm; a relatively marginal "returnffold adjacent the extreme end of said callapsed bag mouth, saidfirst mentioned crease and said return fold being formed in opposite directions, and jmeans movable "transversely of thecreased end ofthe bag to fold the end of the bag once upon itself along said first mentioned A stationary shear blade 33 is rigidly secured to the machine frame and-is disposed in cooperative relation to a movable male creasing mem-.

ber 34, the upper edge of which comprises a movable shear edge. A female creasing member 35 is carried by the movable arm ill and is adapted to register with the member 34. A male creasing member 36 which is also carried by the arm "I is disposed below the member 35 and is adapted to register with a stationary female creasing member 31 disposed generally below the movable shear 34. Thus it will be apparent that the elements" and 34 function to trim the bag ends, and the element 34 also cooperates with the creasing member 3|! to form the sharply defined'marginal return fold; and that the mem bers 36 and 31 form the usual intermediate crease.

Thus it will be seen that the herein described invention provides a bag closing machine, with means to form a single panel fold bag closure having a sharply creased preformed marginal return fold formed adjacent the bag mouth and underlying the top panel in sealed position, and which is simple in design and rugged in construction.

It is of course to be understood that various details of arrangements and proportions of parts may be modified within the scope of the appended claims.

I claim: I

1. In a filled bag closing machine, an-operating station comprising a creasing device adapted to form a crease in the collapsed mouth of a bag a certain distance above the enclosed contents, 9. second creasing device operative beyond said first device and simultaneously therewith and adapted to form a relatively narrow marginal return fold" adjacent the extreme end of said collapsed bag mouth, and means movable transversely of the creased end of'the bag to fold the end of the bag once upon itself along said first mentioned crease.

2. In a filled bag closing machine, a creasing crease whereby said return fold will be disposed adjacent the top plane of the bag contents.

4. In a filled bag closing machine, a creasing device adapted to form a crease in the collapsed mouth of a bag a certain distance above the enclosed contents, a second creasing device operative beyond said first device and simultaneously therewith and adapted to form a relatively narrow marginal return fold adjacent the extreme end of said collapsed bag month, said first mentioned crease and said return fold being formed in opposite directions, and means movable transversely of the creased end of the bag to fold the end of the bag once upon itself along said first mentioned crease whereby said return fold will be disposed in substantial coplanar relation to the top plane of the bag contents.

,5. In a machine for closing filled bags; an operatingstation comprising means for trimming the end of an upstanding collapsed bag mouth, means for positively forming a relatively narrow marginal return i'old adjacent said trimmed end and for simultaneously creasing said upstanding collapsed bag mouth along a line intermediate said return foldand the top of the contents and parallel to the. top plane of the contents, and means to fold said collapsed bag mouth once upon itself along said crease.

6; In a machine for closing filled bags, means for trimming the end of an upstanding collapsed bag mouth, means for positively forming a relativelynarrow marginal return fold adjacent said trimmed end and for simultaneously creasing said upstanding collapsed bag mouth along a s line intermediate said return fold and the top of the :contents and parallel to the top plane of the contents, means to fold said collapsed bag mouth once upon itself along said crease, means to apply adhesive to a portion of the bag, and

means including a member movable to exert sliding pressure upon the folded end of the bag 70.

to press the same upon the adhesive bearing portion thereof.

'7. In a machine for closing filled bags, an operating station comprising means including a stationary shear member and-a movable shear member for trimming the end of an upstanding collapsed bag mouth, means including relatively movable creasing members for positively forming a relatively narrow marginal return fold adiacent said trimmed end and for simultaneously creasing said upstanding collapsed bag mouth along a line intermediate said return fold and the top of the contents and parallel to the top plane of the contents, oneof said creasing members also serving as the moyable shear member, and means to fold said collapsed bag mouth once upon itself along said crease.

8. In a machine for closing filled bags, an operating station comprising means including a stationary shear member and a movable shear member for trimming the end of an upstanding collapsed bag mouth, means including relatively movable creasing members for positively forming a relatively narrow marginal return fold adjacent said trimmed end and for simultaneously creasing said upstanding collapsed bag mouth along a line intermediate said return fold and the top of the contents and parallel to the top plane of the contents, one of said creasing members also serving as the movable shear member, means to fold said collapsed bag mouth once upon itself along said crease, means to apply adhesive to a portion of the bag, and means including a member movable to exert sliding pressure upon the folded end of the bag to press the same upon the adhesive bearing portion thereof.

9. In a filled bag closing machine, an operating station comprising a creasing device adapted to form a crease in the collapsed mouth of a bag a certain distance above the enclosed contents, a second creasing device operative above said first device and adapted to form a relatively narrow marginal return fold adjacent the extreme end of said collapsed bag mouth, said first v mentioned crease and said return fold being formed in opposite directions, means movable transversely of the creased end of the bag to fold the end of the bag once upon itself along said first mentioned crease whereby said return fold will be, disposed adjacent the top plane of the bag contents, means to apply adhesive to a portion of the bag, and means including a member movable to exert sliding pressure upon the folded end of the bag to press said folded end including said return fold upon the adhesive bearing portion thereof whereby the end of said bag will be sealed.

ROYAL T. MOORE.

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