US3154987A - Tobacco web severing machine having a reciprocating roller cooperating with a fixed knife in both directions of traverse - Google Patents

Description

Nov. 3,- 1964 s. CLAUSEN 3,154,987

TOBACCO WEB SEVERING MACHINE HAVING A RECIPROCATING ROLLER COOPERATING WITH A FIXED KNIFE IN BOTH DIRECTIONS OF TRAVERSE 4 Sheets-Sheet 1 Filed April 25, 1961 INVENTOR CLAUSEN ATTORNEY 3,154,987 ING S. CLAUSEN Nov. 3, 1964 TOBACCO WEB SEVERING MACHINE HAVING A RECIPROCAT ROLLER COOPERATING WITH A FIXED KNIFE IN BOTH DIRECTIONS 0F TRAVERSE 4 Sheets-Sheet 2 Filed April 25, 1961 FIG. 3

INVENTOR SIGURD CLAUSEN. BY

ATI'ORNEY Nov. 3,, 1964 s. cLAusEN 3,154,987

TOBACCO WEB SEVERING MACHINE HAVING A RECIPROCATING ROLLER COOPERATING WITH A FIXED KNIFE IN BOTH DIRECTIONS OF TRAVERSE Filed April 25, 1961 4 Sheets-Sheet s INVENTOR SI'GU RD GLAUSEN W 4.

ATTORNEY Nova 3, WM 5. CLAUSEN 3,154,987

TOBACCO WEB SEVERING MACHINE HAVING A RECIPROCATING ROLLER COOPERATING WITH A FIXED KNIFE IN BOTH DIRECTIONS 0F TRAVERSE Filed April 25,1961 4 Sheets-Sheet 4 I fl 86 206 204 v INVENTOR SIGURD OLAUSEN BYW A ATTORNEY United States Patent TOBACCO WEB SEVERING MACHINE HAVING A RECIPROCATIN G ROLLER CODPERATIN G WITH A FIXED KNIFE IN BOTH DHRECTIONS 0F TRAVERSE Sigurd Clausen, Brooklyn, N.Y., assignor to American Machine & Foundry Company, a corporation of New Liersey Filed Apr. 25, 1961, Ser. No. 105,459 6 Claims. (Cl. 83-152) This invention relates to a mechanism for feeding materi-al fiom a continuous source to cutting means to sever a section therefrom.

Particularly the invention relates to a mechanism for feeding a relatively flimsy material, such as tobacco web material, from a supply thereof mounted on a reel, for instance, to cutting means for severing a section of predetermined contour, such as a binder or a wrapper for a machine made cigar.

The tobacco web material is generally limp and is ordinarily handled mechanically by cooperating feed rollers which are operated intermittently in a feeding direction only and suction means which latter include a fixed suction table, a horizontally reciprocating suction head and a vertically reciprocating suction table, which latter coacts with cutting means. In operation, the leading end of a web is first laid on a fixed suction table. Then it is picked up by the horizontally reciprocating suction head which draws a predetermined length of it across cutting means secured generally to the vertically reciprocating table. The cutting operation is then performed and the cut binder or wrapper is then transferred by another displaceable suction head to another operating table in the cigar machine where the next operation is to be performed.

The vertically reciprocable table on which the binder or wrapper has generally been cut to the desired contour is ordinarily actuable to three positions, namely: 1. a lower position to which it is moved out of the path of the oncoming horizontally reciprocating suction head as the leading end of the web is drawn over the table prior to the cutting operation; 2. an intermediate position wherein it coacts with cutting rollers to form the binder or Wrapper; and 3. an elevated position in which it presents the cut wrapper or binder to the suction transfer head which transfers it to the table where the next operation is to be performed.

Because of the fact that the suction table on which the binder or wrapper is cut is not fixed in position, it has been found that on occasion the wrapper or binder is not cut cleanly from the web. Various expedients have been employed to correct this difficulty but all of them leave something to be desired. The present invention proposes an arrangement which has been found to afford perfectly cut binders or wrappers from a web feed machine without fail. This is performed by securing the cutting means to an element which is fixed in position on a rigid structure in the web feed mechanism.

An object of the invention is the improvement of web feed mechanisms employed to cut contours from flimsy or limp material.

A particular object of the invention is to improve web feed machines employed to cut binders or wrappers from tobacco web material.

A feature of the invention is an immovable rigidly sup ported cutting means in a suction type tobacco web feed machine.

Another feature of the invention is a knife secured to a fixed suction table rigidly supported by machine frame elements coacting with an abutting vertically actuable suction table in a tobacco web feed machine.

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Another feature of the invention is an intermittent rack drive carried by a reciprocating suction head carriage, which nack coacts with a gear on web feed rollers, which rack and coacting gear are arranged to stop driving of the gear and feeding the web during a portion of the forward motion of the carriage while a cutting roller carried by the carriage is traversing a knife to sever a binder or wrapper from the web.

Another feature of the invention is a cutting roller secured to a carriage suction head which makes a double traverse of a fixed knife to cut a binder or wrapper in a cigar manufacturing machine.

These and other features of the invention will become apparent from the following description when read with reference to the associated drawings which taken together disclose a preferred embodiment in which the invention is presently incorporated. It is to be understood that the invention is not limited to the disclosed embodiment but may be incorporated in other forms which will be readily suggested to those skilled in the art by the present disclosure. In the drawings:

FIG. 1 is a side elevation of the improved web feed of a cigar machine;

FIG. 2 is a partial sectional end elevation of the same, taken on line 2-2 of FIG. 1;

FIG. 3 is a detailed sectional side elevation of the principal driving member of the web feed mechanism;

FIG. 4 is another end elevation of the web feed mechanism, taken on line 44 of FIG. 1;

FIG. 5 is .a partial plan view, partly in section, of the web feed;

FIG. 6 is a sectional side elevation of the Web feed head, taken on line 6-6 of FIG. 5, and

FIG. 7 is a sectional side elevation of the binder receiving and transfer table.

The web feed mechanism of the present invention comprises a number of components well known in the art, which are described in detail in other patents and which will be described herein only insofar as it is necessary to an understanding of the present invention. There are three such components and these and the patents in which they are described, the disclosures of which are incorporated herein by reference, are as follows:

The support of the reel R from which the tobacco web is drawn, and the brake mechanism which applies a desired restraining torque to prevent overrunning of the reel R while the web W is being drawn off the reel, are de scribed in Patent 2,960,898 granted to H. H. Wheeler,

November 22, 1960.

The mechanism which supports the vertically reciprocable suction table and the controls therefor are described in Patent 2,846,010 granted to H. H. Wheeler, August 5, 1958.

A suction head transfer mechanism suitable for transferring the cut binder or wrapper to another table in the cigar manufacturing. machine, where the next succeeding operation is to be performed, is described and shown in Patent 2,287,004, granted to H. H. Wheeler, June 16, 1942.

Refer now to FIGS. 1, 2, 4 and 5.

The present Web feed mechanism forms a portion of a complete cigar manufacturing machine. Only a few parts of the cigar machine itself, essential to an understanding of the operation of the web feed mechanism, are shown in the drawings herein. The bed plate 20 is attached to the side frame 21 of the cigar machine. The main shaft 22, FIGS. 1 and 4, on which are mounted four cams which coordinate the timing of the operations of the components of the present machine, is a portion of the main shaft on the cigar machine. It is secured in bearings therein and is driven through gearing by a motor, all as is well known and, therefore, it is considered, not

required to be illustrated. Similarly the shafts 24, 26, 2S and 232 which mount hubs of levers activated by cams through cam followers, are secured in bearings, not shown, in the cigar machine.

Certain of the major elements secured to the bed plate 20 will first be mentioned and the apparatus which they support and their functions will be described more in detail hereinafter.

A bracket 30, FIGS. 1 and 2, is secured to bed plate 20 by four bolts, such as bolt 32. This bracket is used to support the web feed rollers 34 and 3-6 together with their driving mechanism, the reel R with its tobacco web material, web tensioning rollers and brake.

A pair of brackets 38 and 39, FIGS. 1 and 4, secured to bed plate 29 by bolts such as at are used as support and bearings for shafts 42 and 44 on which carriage 46 carrying travelling suction head 48 reciprocates. Two vertical bars 50 and 52, FIG. 1, secured to bed plate 20 by bolts, such as 54 and 56, support a rail 58, having a track 69, in which runs a roller 62 which supports the left-hand end of shaft 64 as seen best in FIG. 4. Shaft 64 serves as an axle to which the travelling suction head 48 and the cutting roller 66 are attached. The main suction box 70, FIGS. 1 and 4, is secured to the side frame 21 and connected to a source of suction, not shown, through duct 71. From the main suction box '70 suction is supplied to travelling suction head 48 through a flexible air hose 72, and also through air hose 74 to fixed suction chamber '76, which gives access to the suction chambers in the vertically reciprocable table 30 and the fixed suction table 82 underlying the web material adjacent table 86. Fixed suction chamber '76, FIGS. 1 and 4, is an integral part of bracket 90. Bracket 90 comprises also vertical ribs 84 and Bracket 50 is secured to bed plate 2t? by bolts, such as bolt 92. The travelling suction carriage is reciprocated by means of a projection 94, FIGS. 1 and 4, mounting a stud 96, which is connected through a link db and a stud 99 to the reciprocating lever The table 84) is reciprocated vertically by vertical shaft 102 which is connected by stud that to lever 166. The application of suction to, and the removal of suction from, the fixed suction box 76, the vertically actuable table 8t}, the fixed table 82, FIGS. 5 and 7, and the travel ling suction head 58 is controll d by a plate valve 1%, FIGS. 1 and 4, which is connected by stud lid, to lever 112 which is in turn connected by stud 114 to lever 116.

The tobacco web material W is drawn off the reel R and over two tensioning rollers 118 and 1%. Roller 118 is mounted on shaft 122 secured to bar 126 which is bolted to a projection 139 from bracket 31 which is secured to bracket 30. Roller 12% is mounted on stud 124 secured in bar 128 which is secured by stud 132 to projection 134 of bracket 39. A brake band 136 has its inner end locked by stud 133 to bracket 31 and its outer end tied to stud 140 in an arm of bell crank lever 142 which is secured by stud 144 to projection 130 of bracket 31. The free end of hell crank 142 is connected through Stud 1 38 to bar 159 the lower end of which is connected to a stud 152 secured in bar 128. Link is held in position on stud E52. by a washer and cotter pin, not shown. The lower end of link 1559 has an elongated vertical slot therein. Plate 151 is adjustably secured to link 15% by means of screws 156. A spring 154 interconnects studs 148 and 152. When the web W is to be drawn off the roll, lever 128 is raised, engaging plate 151 and tripping the brake mechanism. The brake band is effective to apply desired torque to the reel R and prevent overrunning of the web feed material during the feeding operation.

The tobacco web material is drawn between the coacting web feed rollers 34 and 36, FIG. 2, and at the start of operations, its leading end is laid on the fixed suction table 82 adjacent the knife. In order to permit the web to be drawn through the rollers 34 and 36, the upper roller is provided with an eccentric 170. A spring 172 tensioned between a stud 174 on the eccentric lever and a stud 176 on bracket 30 maintains the rollers in engagement with the web material during normal operation.

As the travelling suction carriage 48 is reciprocated horizontally by lever 100, in a manner to be explained, a rack 178, FIGS. 1, 2 and 5, adjustably mounted on the carriage, engages gear 18% which is connected through a clutch 182 to the lower roller 34. Secured to lower roller 34, near its left-hand end, as seen best in FIG. 2, is another gear 134 which engages with gear 186 secured to the upper roller 3%. The elements are so arranged that as carriage 48 moves toward the right, as seen in FIG. 1, carrying rack 1'78, motion is imparted to gear 180 and through clutch 12 to gears 184 and 186 which are rotated in directions so that rollers 34 and 36 cooperatively engage the web and feed it in the forward direction in which the carriage is moving to draw the leading end of the web to a position over the vertically actuable table 86, so that a section of the web lying beyond the fixed knife 166 may be severed.

Attention is now called to one of the features of the invention. In order to improve the cutting operation and insure a cleanly severed hinder or wrapper, the cutting roller 66 makes two operating traverses of the knife 160. That is to say, the knife is fixed in position so that its cutting edge projects vertically slightly above the upper surface 211 of the fixed suction table 82 and the horizontal level in which vertically actuable table is maintained during a forward and backward traverse of the cutting roller 66. Reference to FIGS. 1 and 5 shows that the cutting roller is located at the rear of the carriage. It is necessary to stop the web feeding operation as soon as the desired amount of web material has been drawn beyond the knife 16b and throughout the interval while the cutting roller 66 is traversing the knife in the forward direction. In order to permit this, it is necessary to prevent the rack 178 from actuating the gear 184]. There are no teeth on the left-hand end of rack 178, FIG. 3. This portion of the rack is flattened to engage with a flattened portion on the gear 180 with which it coacts, so that the two cooperating, lock intermittent feed rollers 34 and 36 during this period. Of course, it is to be understood that, during the entire return traverse of the carriage, clutch 182 is efiective to prevent operation of the feed rollers. It is pointed out also that in drawing the web forward, the carriage operates just slightly faster than the rollers to insure that the web material is taut when it is drawn over the knife and deposited on the table 80.

Refer now to FIGS. 5 and 7 which disclose another important feature of the invention. The irregularly shaped knife which underlies the web W is secured to the forward edge of the fixed table 82 by bolts, such as bolt 83,. The upper edge of knife 160, which coacts with the roller 66 to perform the cutting, projects slightly above the upper surface 211 of fixed table 82 and also slightly above the position in which the upper surface of vertically reciprocable table 80 is maintained during the cut ting operation while cutting roller 66 is being drawn back and forth across knife 160. Attention is particularly called to the fact that the knife does not move. The fixed table 82 is firmly supported by fixed suction box 76 which is integral with and is supported by the two vertical ribs 84, 86 all of which form part of bracket 90, which is secured by bolts, such as bolts 92, to the base plate or bed 2% of the cigar machine. This arrangement insures a clean cut as the knife does not tend to wobble as is the case when the cutting means is secured to the vertically reciprocable table.

It is to be understood that suction must be supplied to both the fixed table 82 and the vertically actuable table 80 after the leading end of the tobacco web material has been drawn across the knife and the web material is transferred from the travelling suction head to the two tables for the cutting operation.

This is performed in the present invention by providing the fixed suction chamber 76, FIG. 7, the left-hand end of which underlies the fixed suction table 82. It performs the dual function of providing a firm support for knife 160 and a source of suction for both the fixed table 82 and the vertically actuable table 80. From fixed suction box 76, suction is applied to and withdrawn from fixed suction table 82 through aligned apertures 200 and 202 in the upper surface of suction box 76 and the lower surface of fixed suction table 82 respectively. From fixed suction box 76, suction is applied to and removed from vertically actuable suction table 80, through channel 204 in tube 206, which is secured to the lower surface of vertically actuable table 80 and projects through an aperture in the upper surface of fixed suction box 76 into the interior thereof. This arrangement permits suction to be applied to tables 80 and 82 while the tobacco web material is being transferred from the travelling suction head 48, to the tables, permits suction to be maintained on the table during the cutting operation and during the period while the vertically actuable table 80 is being elevated just prior to the transfer of the cut binder or wrapper to another displaceable suction head, not shown, which carries it to the table where the next succeeding operation is to be performed. The upper surface of the table 82 has apertures 210 and the upper surface of the displaceable table 80 has apertures 212 through which suction is applied to and removed from the web material at required times.

The programming of a cycle of operations is under con trol of cams mounted on main cam shaft 22. The lever 100 which imparts horizontally reciprocating motion to carriage 46 has a hub 220 mounted on shaft 26 and is rotatable in a limited arc thereon. Between stud 99 and shaft 26, and secured to lever 100 by a stud 222 is an adjustable rod 224 which is secured to bell crank 226 by stud 228. Bell crank 226 is secured to bracket 230 and limitedly rotatable on stud 232. Bell crank 226 carries cam follower 234 which is actuated in track 236 in cam 238 which is locked to main shaft 22. As shaft 22 and cam 238 revolve, follower 234 rocks bell crank 226 on stud 232 imparting horizontally reciprocating motion to adjustable rod 224. The motion is multiplied by bar 100 which activates carriage 46 through lever 98 and stud 96. The adjustable rod 224 provides means for adjusting the position of the carriage to the knife. The adjustable arm 226 affords means for adjusting the travel of carriage 46 as required for different binders or wrappers. Arm 226 is provided at its lower end with means for varying its effective length in coacting with bar 224 to afford different lengths of travel of carriage 46.

The travelling head 46, FIG. 5, is secured to the shaft 64 by hubs 250 and 252. The hubs are split, as shown at 254, FIG. 6, and are locked on shaft 64 by means of bolt 256, for instance. A stiffening bracket 260, FIG. 4, is secured to bracket 46, and carries a hub 262 to add support to the axle 64.

The roller 66 is mounted in a bracket 270 and secured to the axle 64 by means of four hubs such as hub 272. The cutter roller is provided with an eccentric by means of which the cutting angle may be adjusted and is provided with adjustable tension springs, stop screws and a cutter roller wiper, all as is Well known in the art. Only one cutter roller 66 is required because there is no reverse angle on the cutting edge of the knife.

The web carriage may be swung up for cleaning by unloosening the clamp screws 256. On the under side of carriage 48 is a plate provided with suction holes.

The suction box gate valve 108 is connected through lever 112 and bell crank 116, which latter is secured to and rockable on shaft 24. Arm 280 of bell crank 116 carries cam follower 282 which engages the periphery of cam 284. As shaft 22 revolves, cam 284, locked to shaft 22, actuates follower 282, rocking bell crank 116 on shaft 24, in turn horizontally reciprocating gate valve 108 so as to alternately present an aperture in valve 108 to the ducts in flexible air hose 72 and in conduit 74. The cam 284 is arranged to control the operation of valve 108 so that suction is transferred from the web suction feed head 48 to the movable and fixed tables and 82 at the proper times in the operating cycle. Spring 290, tensioned between bell crank 116 and projection 292, depending from the bottom of the gate valve housing, normally maintains follower 282 in engagement with cam 284.

Vertically reciprocable table 80, as mentioned, is mounted on vertical shaft 102 and connected through a link 103, to stud 104 on bell crank 106. Bell crank 106 is rockable on stud 28 and secured to its depending arm is follower 302 which engages the periphery of cam 304. As shaft 22 rotates, cam 304 locked thereto actuates follower 302, rocking bell crank 106, and reciprocating ad-- justable shaft 102 and table 80 vertically. Spring 310 tensioned between bell crank 106 and projection 312 depending from bed plate 20 maintains follower 302 in engagement with cam 304.

The transfer suction head, not shown, which transfers the cut web or binder from table 880 to a table where the next succeeding operation is performed has suction applied thereto and disconnected therefrom under control of plate valve 320, which connects through bar 322 to hell crank lever 324, rockable on shaft 24 and carrying follower 326 which coacts with the periphery of cam 328 locked to shaft 22. As shaft 22 rotates cam 328 actuates follower 326, rocking bell crank 324 and vertically reciprocating bar 322 and transfer head plate valve 320 which controls the application of suction to and the removal of suction from the transfer head to which it is connected by a flexible suction duct, not shown.

To summarize, the mechanism operates as follows. The tobacco web material W is drawn from the reel R by the two feed rollers 34 and 36 and by the movable suction head 48 to the required length and is then stopped. During this interval, suction is on suction head 48. The vertically reciprocable table 80 is then actuated to a position directly under the head 48. Valve 108 is actuated to transfer suction from the head 48 to the table 80 and transfer of the tobacco web material from the head to the vertically operable table 80 is thereby effected. Suction is also applied simultaneously to the fixed table 82. The table 80 is lowered to a position slightly below the knife 160. The web is drawn to the table 82 as it is deposited thereon by the lowering of table 80. The web material is taut and distended, very slightly, by the slightly longer feed of the carriage 46 than of the rollers 34 and 36, and this condition is maintained while the web material is in the cutting position on tables 80 and 82. The carriage 46 continues its forward movement after dropping the web material W so as to draw the cutting roller 66 over the upwardly projecting knife 160 and to thereby sever the portion of web W which has been drawn forwardly of knife 160 from the remainder of the web.

Reference to FIG. 3, shows the rack 178, the righthand portion of which is provided with teeth of normal length to coact with teeth of normal length on gear 180. The traverse of the rack 178 is made adjustable by means of elongated slots 404 and 406 in rack 178. By this means, the rack 178 may be secured to the carriage by screws 400 and 402 in any desired position throughout the range afforded by the slots. Roller 35 is secured to an eccentric stud mounted on bracket 30 which aids in maintaining rack 178 in proper alignment.

After ending its forward movement, head 48 is drawn back by bar to the starting position, and during this traverse the roller 66 again coacts with knife insuring a clean cut of the hinder or wrapper. The vertically actuable table 80 is then moved upwardly carrying the cut binder or wrapper to a position directly beneath another movable suction head or transfer, not shown. At this point, valves 108 and 320 are operated. Valve 108 cuts suction off from the vertically actuable table 80 and fixed table 82 and valve 320 applies suction to the other movable suction head to pick up the 7\ cut binder or wrapper and to transfer'it to another table, not shown, where the next succeeding operation is to be performed. The movable table 82 then is drawn downwardly by vertical bar 102 again to a position slightly beneath the knife 160 and the cycle is repeated.

What is claimed is:

1. A web feed mechanism, a base plate and a knife therein, said knife integral with said plate, feed means comprising suctional means in said mechanism for feeding the leading end of a continuous web of filmy or limp material to a position beyond said knife, suctional supports for said material on opposite sides of said knife, said knife abutting said supports, said knife having a cutting edge projecting slightly above the top surface of said supports, a cutting roller attached to said feeding means, and other means for reciprocating said cutting roller back and forth across said knife, while engaging said knife on each traverse, to insure the complete severance of said section from said Web, said feed means comprising also a pair of coacting web feed rollers which cooperate in transporting said material across said knife, other means responsive to said reciprocation for driving said web feed rollers during'a first portion only of the forward movement of said carriage, said other means comprising a rack on said carriage and a gear on one of said web feed rollers, and means for disengaging said racks from said gear during a secondportion of said forward movement of said carriage.

2. In a web feed machine, in combination, a bed plate, a suction table immovably secured to said bed plate, a knife secured to an edge of said table, said knife having a cutting edge proiecting slightly above the upper surface of said table, means in-said machine for supporting a continuous web of tobacco material, a travelling suction head, means for displacing said head horizontally,- while carrying-a leading end of said material from a starting point to a first position beyond said knife, a vertically reciprocating suction head coacting with said travelling suction head, means for transferring said leading end of said material from said travelling head to said vertically reciprocating head, means responsive to said transfer for then lowering said vertically reciprocating head to a position slightly below said knife, means for activating said travelling headafter said transfer to a second position beyond said transfer and returning it to said starting point, and a cutting roller connected to said travelling head engageablewith said cutting edge during said actuation of said travellinghead in bth-directions.-

3. A machine in accordance with claim 2, having a rack integral with said travelling head, a pair of rollers coacting together to feed said web material and having a driving gear on one thereof enacting with said rack in advancing said leading end of said web material beyond said knife and means in said rack and in said driving gear for preventing further feeding of said web by said pair of rollers while said cutting roller is drawn over said knife in the direction in which said web is fed to said knife.

4. in a Web feed machine for feeding the leading end of a continuous web of tobacco material to cut a cigar binder or a cigar wrapper therefrom, in combination, a bed plate in said machine, a knife for severing said binder or wrapper from said leading end, said knife integral with said bed plate, a travelling head having suction means therein for grasping said leading end, cam and linkage'means connected to said travelling head for actuating said head, with said leading end attached thereto, to a first position beyond said knife, a pair of rollers coacting with said travelling head for feeding said web material, rack means connected to said travelling head engaging with gear means on said'rollers to assist said travelling head in feeding said material, means connected to said travelling head for releasing said leading end'at said first position, a cutting roller connected to the rear endof said travelling head, said cam and linkage means comprising means for actuating said travelling head to a second position, beyond said first position, while-said cutting roller coacts with said knife, and means for disabling said coasting feed rollers while said travelling head is travelling from said first to said second position. 5.- A web feed machine in accordance with claim 4 in Whichsaid disabling means-comprises a rack and a gear engaging said rack, said rack and said gear each having a section whereon they are out of driving engagement, one from the other.

6. A web feed'machine in accordance with claim 4 in which said disabling means comprises a rack and a gear engaging with said rack, said gear having a section having fiattenedteeth thereon, and said rack having a fiattened section thereon adapted to engage said flattened teeth, to form a positive lock, to stop further feeding of said web by said rollers during the forward traverse of said cutting roller over said knife.

References Cited in the file of this patent UNITED STATES PATENTS 2,451,920 Clausen Oct. 19, 1948 2,846,010 Wheeler Aug. 5, 1958 2,960,898 Wheeler Nov. 22, 1960 3,016,779 Gustavson et a1 Jan. 16, 1962

Claims (1)

1. A WEB FEED MECHANISM, A BASE PLATE AND A KNIFE THEREIN, SAID KNIFE INTEGRAL WITH SAID PLATE, FEED MEANS COMPRISING SUCTIONAL MEANS IN SAID MECHANISM FOR FEEDING THE LEADING END OF A CONTINUOUS WEB OF FILMY OR LIMP MATERIAL TO A POSITION BEYOND SAID KNIFE, SUCTIONAL SUPPORTS FOR SAID MATERIAL ON OPPOSITE SIDES OF SAID KNIFE, SAID KNIFE ABUTTING SAID SUPPORTS, SAID KNIFE HAVING A CUTTING EDGE PROJECTING SLIGHTLY ABOVE THE TOP SURFACE OF SAID SUPPORTS, A CUTTING ROLLER ATTACHED TO SAID FEEDING MEANS, AND OTHER MEANS FOR RECIPROCATING SAID CUTTING ROLLER BACK AND FORTH ACROSS SAID KNIFE, WHILE ENGAGING SAID KNIFE ON EACH TRAVERSE, TO INSURE THE COMPLETE SEVERANCE OF SAID SECTION FROM SAID WEB, SAID FEED MEANS COMPRISING ALSO A PAIR OF COACTING WEB FEED ROLLERS WHICH COOPERATE IN TRANSPORTING SAID MATERIAL ACROSS SAID KNIFE, OTHER MEANS RESPONSIVE TO SAID RECIPROCATION FOR DRIVING SAID WEB FEED ROLLERS DURING A FIRST PORTION ONLY OF THE FORWARD MOVEMENT OF SAID CARRIAGE, SAID OTHER MEANS COMPRISING A RACK ON SAID CARRIAGE AND A GEAR ON ONE OF SAID WEB FEED ROLLERS, AND MEANS DISENGAGING SAID RACKS FROM SAID GEAR DURING A SECOND PORTION OF SAID FORWARD MOVEMENT OF SAID CARRIAGE.

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