US2694964A

US2694964A - Apparatus for nicking the edge of the web passing through a wrapping machine

Info

Publication number: US2694964A
Application number: US308481A
Authority: US
Inventors: John W Smith
Original assignee: Battle Creek Packaging Machines Inc
Current assignee: Battle Creek Packaging Machines Inc
Priority date: 1952-09-08
Filing date: 1952-09-08
Publication date: 1954-11-23
Anticipated expiration: 1971-11-23

Description

NOV. 23, 1954 w, $M|TH APPARATUS FOR NICKING THE EDGE OF THE WEB PASSING THROUGH A WRAPPING MACHINE 5 Sheets-Sheet 1 Filed Sept. 8, 1952 INVENTO'R.

Nov. 23, 1954 J. w. SMITH 2,694,964 APPARATUS FOR NICKING THE EDGE OF THE WEB PASSING THROUGH A WRAPPING MACHINE Filed" Sept. 8, 1952 5 Sheets- Sheet 2 Ti I INVENTOR.

(/0fi/7 //../77/f% I WM {M Nov. 23, 1954 Y J. w. SMITH APPARATUSFOR NICKING THE EDGE OF THE WEB PASSING THROUGH A WRAPPING MACHINE Filed Sept. 8; 1952 5 Sheets-Sheet 5 Hil &

INVENT013. 0/3/9/7 Wf/fi/ffi BY Nov. 23, 1954 SMITH J, w, 2,694,964 APPARATUS FOR NICKING THE EDGE OF THE WEB PASSING THROUGH A WRAPPING MACHINE Filed Sept. 8, 1952 5 Sheets-Sheet 4 NOV. 23, 1954 l w s H 2,694,964

APPARATUS FOR NICKING THE EDGE OF THE WEB PASSING THROUGH A WRAPPING MACHINE Filed Sept. 8, 1952 5 Sheets-Sheet 5 IN VEN TOR.

WW 6M1 United States Patent @fiice 2,694,964 Fatented Nov. 23, 1954 APPARATUS FOR NICKING THE EDGE OF THE WEB PASSING THRQUGH A WRAPPING MA- CHINE John W. Smith, Battle Creek, Mich, assignor to Battle Creek Packaging Machines, Inc a corporation of Michigan Application September 3, 1952, Serial No. 308,481 10 Claims. (Cl. 93-1) This invention relates to improvements in apparatus for nicking the edge of the web passing through a wrapping machine. v

The principal objects of this invention are:

First, to provide apparatus that will nick the edge of a web of wrapping material on either side of a tear strip on the web.

Second, to provide apparatus that is-movably mounted in a wrapping machine to move transversely with respect to the plane of an advancing web of wrapping material anda wider web of tear strip material to sever a narrow strip from the end of the tear strip material and attach the strip transversely-across the web of wrapping material, and simultaneously nick the edge of wrapping material on either side of the tear strip so that the web may thereafter he severed into individual wrappers, each carrying a tear strip for wrappingaround anarti'cle with the end of the tear strip projecting from the finished package and with the wrapper edge nicked for easy tearing of the wrapper by the tear strip.

Third, to provide web nicking or slitting apparatus that is operative upon the edge-of an intermittently advanced web of wrapping material without disrupting the web, for continued advancing motions and without undesirable tearing or wrinkling of the web.

Fourth, to provide tear strip applying and web nicking apparatus in a wrapper web feeding structure that permits formation of a nick in the edge of the web in accurate registry with a tear strip applied to the web.

Other objectsand advantages of the invention will be apparent froma consideration of the following descrip tion and claims.

The drawings, of which there are five sheets, illustrate a highly practical form of the web nicking apparatus associated with tear strip iapplyingand webfeeding apparatus.

Fig. 1 is a plan view of a structure foradvancing a'web of wrapping material .to a wrapping machine while applying tear strips to the web at intervals and nicking the edge of the web adjacent to the tear strips. Portionsof the apparatus'and web are broken away'along the plane of theline 11 in Fig. 2, and only the end of the wrapping machine is illustrated.

Fig. 2 is-a side elevational viewof the structure shown in Fig. 1.

Fig. 3 is a fragmentary transverse cross sectional view through the web feeding and nicking apparatus and the tear strip applying structure taken along the plane'of the line 3-3 in Fig. 2.

Fig. 4 is a fragmentary longitudinal cross sectional view taken along the plane of the line 4-4 in Fig. 3 and looking in the direction of the arrows.

Fig. 5 is a fragmentarylongitudinal cross sectional view taken alongthe plane of the line55 in 'Fig. 3 and looking oppositely from Fig. 4.

Fig. '6 is a fragmentary transverse cross sectional view illustrating the actuating mechanism for the web nicking apparatus .and taken along the plane of the line 6-6 in Figs. 1 and 4.

Fig. 7 is a fragmentary plan view 'of the web nicking apparatus taken along'the plane of'the .line 7-7 in Fig.6.

Fig. 8 is a 'fragmentary'perspective .view of the nicking apparatus shown in Fig. 7.

Fig. 9 is aifragme'ntary transverse cross sectional view taken along'the plane of line99 in Fig. 5 and illustrating the tear stripih'olding and stretching aparatus coacting with the web :nicking apparatus.

tron.

of the attachment.

Fig. 10 is a fragmentary perspective view of the tear strip holding shoe.

Fig. 1 1 is a'perspective view of-a single nicked wrapper with attached tear strip as provided by the apparatus.

Fig. 12 is a perspective view of a package wrapped in the wrapper shown in Fig. -l l.

The web nicking apparatus described and claimed herein is designed to coact with tears'trip applying mechanism such as is disclosed and claimed more completely in my copending application, Serial 242,365, filed August 1-7, 19 51, new Patent No. 2,683,401, for Method and Apparatus for Applying Rip Strips to Wrapping Sheets. T he rip strip applying apparatus disclosed hereinhasbeen modified somewhat for coaction with the web nicking apparatus, but is essentially the same as the prior applica- The entire apparatus is designed for attachment to and coaction with a machine for wrapping individual articles in wrappers formed from a continuous web of wrapping material.

The intake end of a wrapping machine is indicated at l. The wrapping machine includes suitable frame elements 2 and

infeeding rolls

3 and 4 for drawing a continuous web of wrapping material into the machine. A cutter roll Shaving a knife 6 thereon is cooperative with a backing roll on the shaft 5 to cut the incoming web into individual wrapper sheets of the desired length. The shaft 7 is driven from the main driving source 'of the wrapping machine by a chains. The other details ofthe wrapping machine are unimportant to an understanding of 'the presentinvention and so are not described in detail.

The rip strip attaching apparatus and web nicking apparatus are incorporated in an attachment for the wrapping machine. The attachment includes suitable interconnected side members 9 that are secured to the ends of the frame members 2 of the wrapping machine. The attachment includes a pair of fixed guide rolls 10 for the web of wrapping material and-a pair -of bodily movable slack take-up rolls 11. The rolls ll-extend transversely intermediate of the frame members 9 and are carried by loops of chain 12 trained around the rock shafts 13 in downwardly and forwardly inclined loops. Oscillation'of the shafts 13 causes the take-up rolls 11 to move upwardly and downwardly, while the web of wrapping material is travelingthereover. A series of crank wheels and connecting rods illustrated generally at 14in Fig. 1 are'operative to oscillate the shafts 13. The slack take-up rolls and their driving mechanism permit the

infeed rolls

3 and 4 of the wrapping machine to operate continuously, while the web itself is stopped periodically for theattachmerit of rip strips thereto-as will be described. The :incoming web W of wrapping material is taken from a supply roll 16 and trained over an oscillating take-up-idler shaft 7 carried on the swinging ends of arms 18 mounted on the shaft 19. The shaft 19 is oscillated by aconnecting rod '(not illustrated) in timed relationship with the slack take-up rolls 11. Slack take-up and pay out devices of this type are old and so are not discussed in detail.

A supply roll 20 of rip strip forming material is supported near the bottom of the attachment and delivers a web R of the material around an idler roll 21 to :a

feed roll 22. A pressure roll 23 'coacts with the feed roll 22 :and the feed roll 22 is intermittently driven bya gear 24 on the front of the machine. The gear 24 is in turn driven by a pinion 25 and the pinion is driven through aone way-clutch 26 from the rock shaft 27. The shaft 27 is carried by a bracket 28 secured on one side frame of the machine and having an outwardly spaced shaft supporting arm 29. A-crank armsll secured to the shaft 2'? carries a cam follower 31 (see Fig. 1) that is drivingly engaged with a-cam 32 on the'main drive shaft 33 A sprocket 34 angularly adjustably secured to the shaft 33 by a clutch 34 is driven by a-chain 35 from the stub shaft 36 secured to the side ofthe attachment by a bracket 37. The stub shaft 36 is in'tur'n driven by a chain 38 from the shaft 7 of the wrapping machine.

'web is driven intermittently in short increments of "ad- 1 vancing motion. The two webs are brought into lapped engagement at a head structure extending transversely between the side frames 9. The head structure includes a pair of slide members 39 that are vertically slidably mounted on the inner sides of the side members 9 by slideway forming elements 40.

The slide members are interconnected at their lower ends by a rockable cross bar 41 having depending adjustable links 42 secured to its ends. The links 42 are connected at their lower ends to pivots 43 swingably supported at the ends of crank arms 44. The arms 44 are secured to a rock shaft 45 and the shaft 45 is oscillated in timed relationship with the other portions of the attachment by being connected to a crank arm 46 located at the front of the machine. The crank 46 has a cam follower 47 engageable with a cam 48 on the main drive shaft 33 of the attachment. The slides 39 are thus pulled downwardly and returned once during each rotational cycle of the shaft 33. With the infeed

rolls

3 and 4 operating in predetermined timed relationship with the shaft 33, a known length of wrapper web will be drawn through the head after each oscillation of the slides 39.

The slide members 39 are further interconnected by a second cross bar 49 of circular cross section that extends between the slide members in spaced relationship above the cross bar 41. The round cross bar 49 acts as a guide for the incoming web W of wrapper material. Arms 50 integrally connected to the slides 39 and projecting forwardly therefrom carry a third cross bar 51 of circular cross section which further guides the incoming web across a generally horizontal reach indicated at 52, which reach moves upwardly and downwardly with movement of the slide members and the head. The first cross bar 41 of the head structure is flattened across the top to form a table 53 across which the incoming we R of rip strip material is fed. Upstanding ends 54 and 54A on the cross bar 41 support a blade 55 in transversely inclined spaced relationship above the table 53. The blade 55 coacts with a fixed shear plate 56 supported transversely between the side frames 9 by brackets 57. The web R is fed across the table 53 and over the top of the fixed shear plate 56 when the head and cross bar 41 are in elevated position. This condition of the apparatus is illustrated most clearly in Figs. 3 and 4.

Downward movement of the cross bar 41 and cutter blade 55 brings the blade 55 into shearing engagement with the fixed shear plate 56 to shear off a narrow rip strip 58. A spring 59 connected to an arm 60 depending from the cross bar 41 yieldingly biases the movable cutter blade 55 into cutting engagement with the shear plate 56. The position of the head and the cutting elements after completing a cut is illustrated in Fig. 5. The individual rip strip 58 is retained on top of the fixed shear plate 56 by holding fingers 61 that project toward the infeed end of the attachment from the rock shaft 62 on arms 63. The arms 63 and shaft 62 are oscillated in timed relationship with reciprocation of the cross bar 41 by a crank arm 64 secured to the rear end of the shaft 62. The arm 64 is oscillatably driven by a link 65 (see Fig. 1) from one of the oscillating wheels 66 which forms part of the driving assembly 14 to the rock shafts 12. The wheel 66 is oscillated by a connecting rod 67 secured to a crank wheel 68 on the rear end of the shaft 33.

The arms 63 project through vertical plates 69 that are secured to the blocks 70 mounted on the cross bar 51 (see Figs. and 9). The plates 69 have cam slots 71 formed therein and passing the arms 63 as is best illustrated in Fig. 9 so that downward swinging motion of the arms 63 and the fingers 61 causes the arms and fingers to move outwardly and stretch the individual rip strip 58 taut along the surface of the fixed shear plate 56.

Downward motion of the head structure carried by the slides 39 brings the horizontal reach 52 of the wrapper web into slightly upwardly deflected position over the shear plate 56 as is shown in Fig. 5. It also brings a sealing plate 72 into sealing engagement with the defiected web and the sub-adjacent rip strip to seal the rip strip to the web. Electric heaters 73 are carried on the seal plate 72 for this purpose. The seal plate 72 is connected by brackets 74 to the slide member 39 for reciprocation therewith.

The foregoing web feeding and rip strip applying apparatus is substantially the same as that disclosed in my above mentioned application. The mechanism for nicking the edge of the web adjacent to the rip strip will now be described in detail.

Secured to the top of the seal plate 72 at the front end thereof is a carrier block 75 that is adjustable longitudinal of the seal plate to adjust the nicking mechanism to various width webs. Pivotally supported on each side of the carrier block by a common pivot 76 are a pair of

cranks

77 and 78. The depending arms of the

cranks

77 and 78 terminate in spaced relationship above the horizontal reach 52 of the wrapper web and are each provided with pivots 79 on which the fingers 80 are pivotally supported. Springs 81 connected to the outer ends of the fingers bias thetrasversely inner ends of the fingers downwardly against stop pins 82. Downwardly and inwardly inclined needles 83 are carried by the fingers and arranged with respect to the seal plate 72 so that they closely approach the wrapper web when the seal plate is lowered. Springs 81A bias the depending arms of the cranks inwardly and upwardly from the web.

A lever 84 has its inner end pivotally connected to the seal plate 72 adjacent the middle thereof at 85 (see Figs. 1, 3, and 6). The lever 84 extends forwardly through a slot or opening 86 provided therefore in the side frame of the attachment and is bent laterally to receive the projecting screw 87. The screw 87 extends through a vertical slot 88 in an upright link 89 disposed alongside the attachment. The link 89 extends downwardly and is connected as at 90 to one arm of a crank 91 (see Fig. 2). The crank 91 is pivoted to the frame at 92 and its other arm carries a cam follower 93 engageable with the cam 931 on the shaft 33 to force the link 89 and the outer end of the lever 84 upwardly in timed relationship with the vertical reciprocation of the seal plate 72. The length of the slot 88 permits downward movement of the lever 84 with the seal plate 72 without movement of the lever with respect to the seal plate. This brings the structure into the position illustrated in full lines in Fig. 6. At this time upward movement of the link 89 and a shoe 94 adjustably secured thereto engages the outer end of the lever 84 to move lever upwardly. The crank member 77 has an outwardly extending arm thereon indicated at 95 and the arm carries a pin 96 extending slidably through a slot 97 in the lever 84. Thus upward movement of the lever 84 with respect to the seal plate 72 causes the crank 77 to swing outwardly of the machine. The two cranks 77 and 78 being keyed to the common pivot 76 move in unison to swing the needles 83 downwardly and outwardly into penetrating and ripping engagement with the edge of the web on either side of the rip strip 58.

It has been found that the points of the needles 83 penetrate easily through the wrapper web and that it is thereafter easy to form two slits or nicks in the web by downward and outward swinging motion of the needles. In

order to support the edge of the web against defiection' under the influence of the needles 83, a backing lug 98 is provided on an arm 99 swingably supported on the cross bar 49. A spring 100 biases the arm 99 downwardly while a tappet 101 on the arm is engageable with the top of the shear plate 56 to swing the lug 98 into supporting engagement with the bottom of the web adjacent the edge of the web that is to be nicked.

After the rip strip has been applied to the wrapper and the edge of the wrapper has been nicked the slides 39 and the seal plate 72 carried thereby move upwardly carrying the cranks 77 and needles 83 with them. The needles which have penetrated and slit the web thus move freely upwardly through their self-formed slits without disturbing the position of the web. After the needles have been withdrawn from the web the link 89 moves downwardly to permit downward movement of the lever 84 and subsequent inward swinging of the

cranks

77 and 78. The web can then be advanced further to the cutter roll 5 with a rip strip firmly attached to each section of the web. If two nicks or slits are not needed in the edge of the wrapper, either one of the depending crank

arms

77 or 78 and its associated needle 83 can be omitted or dis- 1 connected from the lever 84.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In combination with a wrapping machine having means for advancing a web of wrapping material therethrough and other means for advancing a sheet of rip strip material in step by step motion parallel to and spaced from a portion of said web, means for stopping a reach of said web adjacent the end of said sheet, a cross meanest head-extending transversely of said reach andhaving a pressure plate disposedon theopposite sideof said web from the end-of said sheet, a fixed shear plate positioned on *the opposite side of said web from said pressure plate and positioned to receive and support the leading end of said sheet, a'cutter blade carried by said cross head between said sheet and said web and cooperative with said shear :plate, means for reciprocating said cross head in tirned relationship with said web and sheet feedingmeans to cause said cutter blade to sever a rip strip from the end o'f said Sheet antl-adVance said pressure plate against said fixed shear plate to clamp said reach against said strip, *fingers rockably driven in timed relation to said head and engageable with the endsof said strip to hold said strip on said fixed plate, crank members pivotally supported on opposite sides of said pressure plate and havinglarms extending to-adjacent the web engaging edge of tthe pressure :plateand located over the longitudinal edge of .said web, web piercing needles swingably and yieldably mounted ontthe ends of said arms, a lever having-one :end pivotally connected to said pressure plate inwardly .of said .crank members with respect to the edge of said web, actuating :arms on said crank members having a pivotal connectiontoian intermediate portioniof said lever, asaid .connectionIbeing slidable longitudinally of said lever, .aitappet transversely engageable with the swinging end of said lever to move said lever and saiderank members relative to said pressure plate to swing said needles transversely and outwardly through the edge of said web, andmeans operated in timed relationship with said web feeding means'connected to actuate said tappet, said .tappet actuating means having a 1ost;motion driving connection to the swinging end of said lever permitting return of the pressure plate to spaced position from said web.

2. In combination with a wrapping machine having means for advancing a web of wrappingmaterial therethrough and other means for advancing a sheet of rip strip material instep "by step motion parallel to and spaced from iagportion of said web, means :for stopping a reach ofsaidweb adjacent the .end of said sheet, a cross head extending transversely of said reach and having a pressure plate disposed on the opposite side of said web from the end ofsaid sheet, a fixed shear plate positioned on the opposite side of said web from said pressure plate andpositioned to receive and support the leading .end of said sheet, a cutter blade carried by said crossihead between saidsheet and said web and cooperative with said shear piate, means for reciprocating said cross head .in timed relationship with said web and sheet feeding means toxcause said cutter blade to sever a rip strip from the-end of said sheet and advance said pressure plate against said fixed shear plate to clamp said reach against said strip, fingers rockably driven in timed relation to said head and engageable with the ends of said strip to hold said strip on said fixed plate, crank members pivotally supported on said pressure plate and having arms extending to adjacent the web engaging edge of the pressure plate and located over the longitudinal edge of said web, web piercing needles yieldably mounted on the ends of said arms, a lever having one end pivotally connected to said pressure plate inwardly of said crank members with respect to the edge of said web, actuating arms on said crank members having a pivotal connection to an intermediate portion of said lever, said connection being slidable longitudinally of said lever, a tappet transversely engageable with the swinging end of said lever to move said lever and said crank members relative to said pressure plate to swing said needles transversely and outwardly through the edge of said web, and means operated in timed relationship with said web feeding means connected to actuate said tappet.

3. In combination with a wrapping machine having means for advancing a web of wrapping material therethrough and other means for advancing a sheet of rip strip material in step by step motion parallel to and spaced from a portion of said web, means for stopping a reach of said web adjacent the end of said sheet, a cross head extending transversely of said reach and having a pressure plate disposed on the opposite side of said web from the end of said sheet, a fixed shear plate positioned on the opposite side of said web from said pressure plate and positioned to receive and support the leading end of said sheet, a cutter blade carried by said cross head between said sheet and said-web and cooperative with said shear plate, means 'for reciprocating said-cross head in timed relationship with said web and sheet'feeding-rneans-to-cause said-cutter blade to sever a rip "strip from the end of said sheet and advance said pressure plate against said fixed shearplate toclamp said reach against said strip, a .crank pivotally supported on said pressure plate and having an arm extending to adjacent the web engaging edge of :the pressure plate and located over the longitudinal edge of said web, a 'web piercing needle mounted on the end of said arm and projecting inwardly "over the 'edge of the web, a lever having one end pivotally-connected to said pressureplate in spaced relation to the pivotof said-crank, an actuating arm on said "crankhav-ing --ap'ivotal connection to an intermediate portion of said 'lever,tsaid-connection beingslidabledongitudina'lly of said lever, a tappet transversely engageable with the swinging 'end of said lever to move said lever andsaid crank member relative to said pressure plate to swingxsaid needle through and transversely and outwardly beyond the edge of said web, and means operated in tiined relationship with said web feeding-means connected to actuate said-tappet.

4. In combination with a wrapping machine having means for advancing a webtof wrapping material therethrough and other means for advancing a-sheet of rip strip material in step -'by step motion parallel to and spaced from'a portionof-said web, means for stopping avreach of said web adjacent the end of said sheet, a cross 'h'ead extending transversely of said reach and having a pressure plate disposedon the opposite side ofsaid web from theend of said sheet,'a fixed shear plate positi'oned-onthe oppositesideof said web'from saidpressure plate and positioned to =receive and support the leading end of said sheet, a cutter blade carried by said cross head between'said sheet and said web and cooperative with said shear plate, means for reciprocating said cross head intimedrelationship with said web and sheet feeding-means to cause said cutter blade to sever a rip strip from the-end of-said sheet and advance said pressure plate against said =fixed shear plate to clamp said reach against said strip, a crank pivotally supported on said pressure plate and having an arm extending to adjacent the web engagingedgeof the pressure plate and located over the longitudinal edge of said web, a web piercing needle mounted on the end-of said arm and projecting inwardly over the edge of the web, a lever having one end pivotally connected to said cross head-in spaced'relationto the pivot-of said crank, an actuating arm on said crank having a dr'ivingconnection to an intermediate portion of said lever, a tappet transversely engageable with the swinging end-of said lever to move said lever and said crank member relative to said pressure plate to swing said needle through and transversely and outwardly beyond the edge of said web, and means operated in timed relationship with said web feeding means connected to actuate said tappet.

5. In combination with a wrapping machine having means for advancing a web of wrapping material therethrough and other means for attaching a rip strip to spaced portions of said Web, a cross head extending transversely of said web and having a pressure plate disposed on the opposite side of said web from the line of attachment of the strip to said sheet, a fixed plate positioned on the opposite side of said web from said pressure plate and cooperative therewith to grip said strip and web therebetween, means for reciprocating said cross head in timed relationship with said web feeding means to advance said pressure plate against said fixed plate, a crank pivotally supported on said pressure plate and having an arm extending to adjacent the web engaging edge thereof and over the longitudinal edge of said web, a web piercing needle mounted on the end of said arm, actuating means connected to said crank and carried by said pressure plate for movement therewith, a tappet transversely engageable with said actuating means to move said means and said crank relative to said pressure plate to swing said needle transversely and outwardly through the edge of said Web, and means operated in timed relationship with said web feeding means connected to actuate said tappet.

6. In combination with a wrapping machine having means for advancing a web of wrapping material therethrough, means for stopping a reach of said web, a cross head extending transversely of said reach, cranks pivotally supported on opposite sides of said cross head and having arms extending to adjacent the web and swingable in transverse planes over the longitudinal edge of said web, web piercing needles swingably and yieldably mounted on the ends of said arms, a tappet connected to other arms of said cranks and operative to move said cranks relative to said head to swing said needles transversely through and transversely and outwardly across the edge of said web, and means operated in timed relationship with said web feeding means connected to actuate said tappet.

7. In combination with a wrapping machine having means for advancing a web of wrapping material therethrough, a crank pivotally supported on said machine and having an arm extending generally perpendicularly to and adjacent the web and swingable in a transverse plane over the longitudinal edge of said web, a web piercing needle mounted on the end of said arm and extending at an angle therefrom inwardly from the edge of said web, means connected to said crank and operative to move said crank relative to said machine to swing said needle transversely through and transversely and outwardly across the edge of said web, and means operated in time relationship with said web feeding means connected to actuate said crank operating means.

8. In a wrapping machine having means for advancing a web of wrapping material therethrough, a pair of crank members swingable in spaced planes transversely of said web and having arms extending generally perpendicularly toward the edge of said web, fingers pivotally supported on the ends of said arms and having inner ends spaced over said web and yieldably biased to rotate toward said web, stops on said arms limiting the biased movement of said fingers, needles carried by said fingers and directed toward said web and inclined transversely away from the edge of said web and toward the face thereof, a lever having one end pivotally supported on said machine in spaced relationship with the pivots of said crank members, means forming a driving connection between said lever and said crank members, and means for oscillating said lever with respect to said crank members to swing said crank members and the needles carried thereby in transversely and outwardly swinging direction relative to the surface and edge of said web whereby the needles penetrate the web inwardly from the edge thereof and swing outwardly in a tearing action through the edge of the web.

9. In a wrapping machine having means for advancing a web of wrapping material therethrough, a crank member swingable in a plane transversely of said web and having an arm extending generally perpendicular toward the edge of said web and positioned in spaced relationship to said web, a finger pivotally supported on the end of said arm and having an inner end yieldably biased to rotate toward said web, a stop on said arm coacting with said finger, a needle carried by said finger and directed toward said web and inclined transversely away from the edge of said web and toward the face thereof, a lever having one end pivotally supported on said machine in spaced relationship with the pivot of said crank member; means forming a driving connection between said lever and said crank member, and means for oscillating said lever with respect to said crank member to swing said crank member and the needle carried thereby in transversely and outwardly swinging direction relative to the surface and edge of said web whereby the needle penetrates the web inwardly from the edge thereof and swings outwardly in a tearing action through the edge of the Web.

10. In a wrapping machine having means for advancing a web of wrapping material therethrough, a crank member swingable in a plane transversely of said web and having an arm extending generally perpendicularly toward the edge of said web and positioned in spaced relationship to said web, a needle carried by said arm and directed toward said web and inclined transversely away from the edge of said web and toward the face thereof, a lever having one end pivotally supported in spaced relationship with the pivot of said crank member, means forming a driving connection between said lever and said crank member, and means for oscillating said lever with respect to said crank member to swing said crank member and the needle carried thereby in transversely and outwardly swinging direction relative to the surface and edge of said web whereby the needle penetrates the web inwardly from the edge thereof and slwings outwardly in a tearing action through the edge of t e web.

References Cited in the file of this patent UNITED STATES PATENTS