US2283096A - Wrapping paper control mechanism - Google Patents

Description

May 12, 1942. o. SANDBERG WRAPPING PAPER CONTROL MECHANISM Filed Feb. 5, 1940 4 Sheets-Sheet 1 INVENTOR. Oscar fiande g BY y a ATTORNEYS.

May 12, 1942. o. SANDBERG 2,283,096

WRAPPING PAPER CONTROL MECHANISM Filed Feb. 5, 1940 4 Sheets-Sheet 2 INVENTOR.

.Uecar Sandbag, BY 2 ATTORNEYS May 12, 1942; o. SANDBERG WRAPPING PAPER CONTROL MECHANISM Filed Feb. 5, 1940 4 Sheets-Sheet 4 INVENTOR. Oscar fiandbe g,

' ATTORNEYS.

llll ll. lullll lll Patented May 12, 1942 Oscar Sandberg, Defiance,

Modern Equipment Corporation,

Ohio, assignor to Defiance,

Ohio, a corporation of Ohio Application February 5, 1940, Serial No. 317,369

13 Claims;

My present application has to do with a mechanism for controlling. wrapping paper supplied to a machine for wrapping articles such as candy bars and the like and is a continuation-in-part of my copending application, Serial No. 179,260, filed December 11, 1937, now Patent No. 2,208,- 7'76, issued July 23, 1940.

One object of the invention is to provide means for supporting two webs of wrapping paper, meansfor cutting thewebs into wrappers and feeding the wrappers to position for wrapping thearticles therein, the feeding mechanism including an electric eye viewing mechanism operated by marks on the web of wrapping paper and operative through speed change mechanism that propels the web of paper into the wrapping machine to change the speed thereof and thereby keep periodic advertising material on the wrapping paper in step with the bars as they are fed to wrapping position so that the advertising material will always be centered on mechanism comprising two sets of V pulleys and the bars, regardless of irregularities in paper feed A as caused by slippage and other factors.

Another object is to provide the speed changing mechanism in the form of a shaft driven by a pair of belts, one at a higher speed than re quired and the other at a relatively lower speed, the high speed belt being normally the controlling factor in paper feed and the slow speed belt being a modifying factor, operable if required for each of the wrappers to be cut from the web, the electric eye viewing mechanism being operatively associated with the slow speed belt to bring it into play and to vary the time period of such play, depending upon requirements determined by the amount that each wrapper is out of step with the wrapping mechanism.

A further object is to provide means for cutting the web of wrapping paper into sheets or wrappers somewhat longer than the bar, the cutting mechanism being associated and tinied with the web feeding mechanism and thereby adjusted for cutting the web at the proper points by the electric eye viewing mechanism.

Still another object is to provide wrapping paper control mechanism in which the web of wrappingmaterial is fed normally at a higher speed than required to compensate for slippage and to provide means for slowing down the speed for each wrapper to bqcut from the web so that the wrapper is cut at the desired place on the web, this being particularly desirable where there are repeated patterns on the web and there is to be one pattern for each article wrapped.

belts, one normally operating at high speed and the other one at a lower speed, a simple arrangement of belt tightening rollers being provided to simultaneously loosen the high speed belt and tighten the low speed belt, .and the rollers being operated in response to the passage of complete patterns on the web past a photoelectric viewing means.

Still another object is to provide a cam means to reset the belts to normal position after the photoelectric viewing means has caused them to shift from high speed to low speed position,

the relation of the cam and period of actuation by the photoelectric viewing means determining Another object is to provide a reservoir for I the adhesive and an adhesive pot in which the adhesive is deposited to the proper depth for being picked up by the ends of rotating pins which then contact with the wrapping web to deposit the spots of adhesive thereon.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the variousparts of my device whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claimsand illustrated in the accompanying drawings. tion is susceptible of a variety of embodiments, it is unnecessary to fully describe and illustrate more than one in order to give a full understanding of the invention both from its structural and functional standpoints. Accordingly, I have illustrated apreferred and desirable embodiment of the invention in the accompanying drawings, in which: I

Figure 1 is a rear elevation of a wrapping paper control mechanism embodying my invention and showing it attached to a wrapping machine of a second copending application, Serial No. 317,370, filed February 5, 1 940, which is an improvement over my application Serial No. 179,260 hereinbefore mentioned. Said second co- Although the invenpending application illustrates a wrapping machine designed to receive wrappers from the mechanism illustrated in the present application, and I will hereinafter refer to it as said second copending application.

Figure 2 is a side elevation looking from the right side of Figure 1;

Figure 2a illustrates a section of the wrapping eration of the web of wrappingmaterial as it passes through the machine, and

Figure5 is a sectional view on the line 5 -5 of Figure 4.

The wrapping machines of said copending applications are adapted for wrapping articles of irregular. shape, such as candy bars and the like. The 'mechanism' of this application is adapted to feeda web of wrapping material to the wrapping machines, to cut the web into individual wrappers and to synchronize the feeding mechanism with the cutting means so that cutting of the wrappers from the web is performed at the desired point even though the web of material may slip at times relative to its feeding means. Referring now to the specific construction of the mechanism, 1 provide a pair of vertical frame members F, suitably and rigidly connected together and provided at their tops with a table T. Journaled in the frame members F is a main drive shaft 24'. The drive shaft 24 has secured thereto'a gear 28.

The gear is driven in any suitable manner,

such as illustrated in said second copending ap- "plication. Wrappers for the articles wrapped in the wrapping machine of said second application are supplied by the device of the present application in the form of inner and outer webs W and W of the proper width and continuous r length wound from reels R and R. The reels R and R have pintles I44 supported for rotation in seats of a pair of brackets I46. To prevent excess rotation of the rolls of web W and W,

flexible straps I48 pass frictionalJy thereover and terminate in weights I50. The webs W and W pass under a weight roller I52 carried by a pair of arms I54 pivoted at I56 to the frame members F. A stop pin I53 is provided for the roller I52 to engage in its extreme lower position.

After passing under the roller I52, the webs W and W extend upwardly between an electric eye mechanism I58 and a light source therefor indicated at I60. The purpose of the electric eye mechanism is to have marks I62 on the web W (see Figure 2a) pass the electric eye and the eye in turn regulate the speed of feeding the web and determine the position at which it is cut into individual wrappers W" before the wrappers are wrapped around the articles to be wrapped by the wrapping machine. The desirable point of cutting is indicated by dotted lines I64 so that the web, printed with a repeated pattern (one for each bar), will be out exactly between the patterns. The web W may be either Cellophane or waxed paper printed with the trade name of the contents and of the maker or distributor thereof as is usually done, while the inner web W may be tissue, waxed paper, Cellophane or the like.

The webs W and W, after leaving the electric eye I58, pass over an idler roller I66 and then around a feed roller I68 (see Figure 4). Above the roller I68, a drive roller I10 is provided, at least the roller I10 being of rubber or the like to provide a good grip on the webs W and W and to propel them toward the table T when the roller I10 is rotated clockwise by sprockets I84 and I85 and a chain I12. The roller I68 is simultaneously rotated counterclockwise through gears I13 and I15.

For maintaining proper pressure between the rollers I68 and I10, the shaft I14 of the roller I10 is carried at its ends by eccentric levers I18. The eccentric levers I16 are pivoted at their centers by means of pintles I18 to brackets I80, which form the end plates for supporting the rollers I88 and I10. The levers I16 are urged in the proper direction for moving the roller I10 toward the roller I68 by springs I82, such movement being limited by a limiting hook I82. The hook I82 is supported by a bracket I82".

The sprocket I84 for driving the chain I12 is mounted on a shaft I86. The shaft I86 is journaled in the front frame member F and in a bracket I88 secured thereto, as shown in Figure 3. The shaft I86'has secured thereto a high speed V pulley I90 and a low speed V pulley I9I. For driving the V pulleys I90 and I9I, I provide a pair of belts I92 and I93. The belt I92 extends a ound a V pulley I94 and the belt I93 extends around a smaller V pulley I96. The pulleys I94 and I96 are secured to a countershaft I98.

The countershaft in turn is driven through a clutch mechanism (consisting of a notched disc 200, an arm 202 and a pivoted dog 204) from a sprocket wheel 206. The sprocket wheel 206 is loose on the shaft I98 and is retained in position by a collar 208. The sprocket wheel 205 is driven by a chain 2 I0 from a sprocket wheel 2I2. The sprocket wheel 2I2 is secured to the main shaft 24.

The clutch consisting of the parts 200', 202 and 204 is adapted to be released and the shaft I98 to thereby be operated only when there is an article approaching position to be wrapped. The mechanism for accomplishing this result includes a vertical rock shaft 2I4 journaled in brackets 2I6 extending from the rear frame member F.

At its upper end, the rock shaft 2 is provided with means to rock the rock shaft and swing a lever 220 at its lower end to engage and swing a lever 222 out of position in front of a shoulder 224 on the dog 204. Such means is shown as a lever 2I8 on a rock shaft 2I4 in my copending application Serial No. 317,370 (Figure 3), the lever projecting to a point to be engaged by articles being wrapped as they are advanced by a conveyor. Gravity causes the dog 204 to drop after the lever 222 has been swung out of position .in front of the shoulder 224 and a hook 226 on the dog to engage the notch 228 in the disc 200 as soon as the notch comes to a position of registry with the hook. Thereupon the arm 202 and the shaft I98 will be rotated in unison.

Each time the shaft I98 is rotated one revolution, the pulleys I94 and I98 are also rotated one revolution. The belt I92 is normally the driving factor for the shaft I86. For this purof the revolution of the 2,283,096 pose, an idler 238 is provided (see Figure 3).

pivoted at 250 on a bracket252. A spring 254.

normally-urges the'rocker arm 248 to the full line position shown.

Formoving the arm 248 to the dotted position in Figure 3, I'provide a solenoid 256 and an armature 258 to be elevated thereby when the solenoid is energized. A second idler 260-is 'provided for the high speed belt I92 and this idler is adjustable for the purpose of. tightening the belt to the desired degree for proper driving traction when the idler 238 is in the position of-Figure 3..

Thelow speed belt I93 is normally loose, as

illustrated, andis adapted to be tightened simultaneousl with the loosening of the high speed belt I92. This is accomplished by mounting a link 262 on thelever 240 and having the lever 262 carry an idler 2.64 for the belt I93. Also for the belt I93, an adjustable idler 266 is provided to compensate for stretching ofthe belt as the machine is operated.

From the foregoing description, it will be obvious that the spring ley 238 and tighten the idler pulley 264 when- 244 will loosen the idler pulever the solenoid 256 is energized. There would be nothing, however, to return the idlers to their initial position. To accomplish this purpose, I provide the following described mechanism.

A rod 268 is pivoted at its upper end to the shaft 210. The shaft 210 extends rearwardly from the lever 240 through an arcuate slot 212 in the front frame member F. Back of the front frame member, a lever-214 similar to the lever 240 is pivoted on the shaft I98 and supports the shaft 210 so that it can be swung through its operating cycle without. binding. The lower end of the rod 268 terminates in a fork 216 straddling the main shaft 24.

The main shaft has a cam 218 thereon for propelling the rod 268 upwardly through the medium of a roller 280 carried by the fork 216 and engaging the cam surface of the cam. If the stop member 246 were to remain in the dotted position of Figure 3, it will be obvious that during a period extending over about two-thirds main shaft 24, the lever 240 would be shifted by the spring 244 to loosen the high speed belt I92 and tighten the low speed belt I93- The duration of such period is shortened, however, by actuating the solenoid 256 so that the stop 246 is removed from in front of the extension 242 of the lever 240 prior to the expiration of the two-thirds period ofrevolution mentioned. The relative position in the twothirds period, where the solenoid 256 operates, would determine the duration of the last portion of that period effective to loosen the high speed belt and tighten the low speed belt. The speed of the shaft I86 and thereby of the feed rollers I68 and I19 is thereby governed in accordance with the marks I62 on the wrapper web W in a manner which will appear when describing the operation of the machine in detail.

In Figure 3, I have also shown electrical connections from a source of current supply to the electric eye-I58, the light source I60 and the solenoid 256. No attempt has been made to go into detail, the essential characteristics being continuous energization of the light source I60 and operation of the solenoid 256 only when the electric eye I58 isactuated and thereby establishes a circuit for-the solenoid." I

- applying pins 282.(see-Figureg4).-

- positions 7 shaft 303 is Asthe webs Wand W pass from the roller I66 to the roller-I68, two-spots of adhesive; 283 are applied to each wrappersection by adhesive The pins 282 are rotated by a shaft 284- and ,dip into an adhesive pot 286. .The pot 286 has a reservoirportion 288... The adhesive isrpicked up from the relativelydeep part 2880f the adhesive pot 286 and transferred intothe adhesive pot proper by a gear 292, driven by a pinion 294.

,The pinion 294 is mounted on the shaft v284.

The adhesive, carried upwardly by the gear 292, passes into the .adhesive pot proper over a wall 298 which serves to maintain the adhesive at a predeterminedv level for depositing the. proper amount thereof on the pins 282. The pins 282, as they rotate, contact with the web W, thereby placing two spots of adhesive thereon-at the 283 indicated in Figure 2a. The shaft 284 of the adhesive applying mechanism is driven by a sprocket 302 (seeFigure-Dt Referring to Figure 5, it will be noted that the sprocket 302 is mounted on a shaft 303. The journaled in oneof'the end plates I80 and terminates in a Z shaped cut at 305 coacting with another 2 shaped cut at 301 of asleeve 309. The sleeve 309 is journaled in a bearing 3 of the glue pot 286 and is secured to the shaft 284. The shaft 284 hasthe pinion 294 mounted on it and also ahub 3I5 which carries the pins 282;

The sprocket 302 is driven by achain 304 and The-sprocket 306 is mounted on the shaft I98 whi-chis driven intermittently by the clutch mechanism 200, 202, 204. The chain 304 also extends around an idler sprocket 308 and a cutter drive sprocket 3I0 on a shaftv 3I2.

The cutter shaft 3I2 has a cutter roll 3I3 thereon and a blade 3I4 projects from the roll (see Figure 4) The blade 3 I4 is adapted to coact with a stationary blade 3I6 for severingthe webs W and W on the dottedline I64 of Figure 2a. The blade 3I4 is set in an arbor 3I1, as shown in Figure 4, with set screws 3I8 to adjust it radially. Other set screws 3I9 are provided to retain the adjustment.

Trailing the blade 3I4 is a semicylindrical leaf spring member 320 which serves an important function in the web cutting operation, as will hereinafter appear. The stationary blade 3I6 is secured to a rigid cross rod 32I by cap screws 323. A web guide of the blade 3I6 by an angle bar 325.

The webs W and -W' are propelled between the cutting blades 3I4 and 3I6 onto the table T and individual wrappers indicated as W" are sheared therefrom. The wrappers W" are then propelled to wrapping position by mechanism of the machine shown in said second copending application.

Practical operation 1 In the operation of my wrapping paper control mechanism, assuming that the shaft 24 is rotating, when an article reaches position to be wrapped, it rocks the clutch operating rock shaft 2 I4 and thereby swings the clutch operating arm 222 to a position that permitsthe hook 226 of the dog 204to engage in the notch of the constantly rotating clutch disc 200. This will cause the shaft I98 to rotate'one revolution if only one article passes by and rocks the shaft 2I4,'or to relatively deep plate'324 is supported back web and fed to wrapping position only when an article also comes to wrapping position. The web feeding mechanism is normally opwrapper W" to the machine during one revolution of the shaft I98. which corresponds to one article coming to wrapping position. The purpose of this is to compensate for any possible slippage of the webs as they are propelled to the wrapping machine. T cause the cutter bar 8 to function at the proper point in the length of the webs (at the dotted line I84 in Figure 2a), the electric eye viewing mechanism I58 is provided.

Whenever one of the marks I62 of the web W asses the eye, it effects energization of the solenoid 256. Energization of the solenoid depresses the stop arm 248 (see Figure 3, dotted position) to permit the high speed belt I92 to be loosened and the low speed belt I93 to be tightened, thus slowing down, for a variable period of time, the rotation of the shaft I86 driven from the shaft I88. Whenever one of the marks I62 is the maximum distance ahead of where it should be (resulting from no slippage), then the maximum period of speed reducing is effective. When there is slippage, then the mark will not be so far ahead of its required position for proper operation of the blade 3 at the dotted line I84 and consequently the solenoid 256 will be energized at a relatively later period in the rotation of the shaft I98, thereby reducing the time period of speed reducing of the mechanism.

During each revolution of the shaft I98 (which rotates at the same speed as the main shaft 24) the solenoid will be energized to permit the spring 244 to shift the mechanism to slow speed position. The cam 218, each revolution of the main shaft, will reset the mechanism to high speed position until the solenoid is again energized.

I have designed the cutting blades 3 and 3 I 6, together with their associated parts shown in Figures 4, 4a, 4b, 4c and 4d to provide a minimum of interference with the movement of the webs W and W as they are fed therethrough. In

operation, the arbor 3I'I rotates clockwise in Figure 4a as the webs W and W are fed in the direction of the arrow a. The spring blade 320, it will be noted, resiliently engages the webs against the plate 324 to aid in the movement of the webs as the blade 3 springs toward the blade 3I6, as in Figure 412. Finally, the webs are sheared off between the trailing corners of the blades 3 and 3H5, as shown in Figure 4c, the blade 32!! springing in toward the arbor 3I3 as it attempts to pinch the web between itself and the blade SIG. As soon as the blade M8 is passed by the blade 320, then the blade 320 will swing outwardl again (as in Figure 4d) to aid in propelling the webs W and W onto the table T. The arbor 3H being properly timed relative to the speed of feed of the webs makes it possible to quickly shear the webs into individual wrappers as they are propelled onto the table T by the feed rollers I68 and III] without interference with their movement.

The webs W and W as they are fed onto the table T by the feed rollers I68 and III) are engaged by mechanism of the wrapping machine lreep it continuously rotating as long as there are articles passing in succession to wrapping po- 1 sition. In this way, a wrapper is cut from the shown in said second copending application.v By the time the cutting blade 8 severs the wrap- .per W" from the webs W and W, such mecha- I erated by the highspeed belt I92 at a speed somewhat higher than required to feed one nism has a good grip on the wrapper for effecting movement thereof to the desired position in the wrapping machine.

. While I have shown a particular embodiment of my invention, it will be understood of course that I do not wish to be limited thereto since many modifications may be made, and I therefore contemplate by the claims appended hereto to cover any such modifications or substitutions of mechanical equivalents as fall within the true spirit and scope of my invention without sacritlcing any of its advantages.

I claim as new and desire to secure by Letters Patent of the United States:

1. In wrapping paper control mechanism, wrapper feed means comprising a pair of feed rolls frictionally engaging a web of wrapping paper to feed the same, cutting means for cutting the wrapping paper into individual wrappers, a source of power, a clutch between said source and said rolls and cutting means, and means for transmitting power from said clutch to said rolls, said transmitting means being adapted to drive said rolls at increased or lessened speed and comprising a drive shaft controlled by said clutch and having a set of pulleys of different diameters thereon, a second shaft, means drivingly connecting said feed rolls with said second shaft, said second shaft having a set of pulleys thereon in alignment with the pulleys on said drive shaft, belts connecting said drive shaft pulleys with said second shaft.

pulleys, said belts being loose on said pulleys whereby insufficient traction is afforded to transmit power from one set to the other, means for selectively tightening said belts to render them operable to transmit power whereby to drive said second shaft and said rolls at different speeds and comprising belt tightening rollers associated with each of said belts, and means including a photoelectric device responsive to the position of the wrapping paper with respect to said cutting means for selectively engaging the belt tightening rollers with their respective belts to tighten the same.

2. In wrapping paper control mechanism, wrapper feed means comprising feed rolls engaging a web of wrapping paper to feed the same, cutting means for cutting the wrapping paper into individual wrappers, a source of power, said cutting means being driven thereby, and means for transmitting power from said source to said rolls by driving said rolls at lessened speed, said last means comprising a drive shaft operated by said power means and having a set of pulleys of different diameters thereon, a second shaft, means drivingly connecting said feed rolls with said second shaft, said second shaft having a set of pulleys thereon in alignment with the pulleys on said drive shaft, belts connecting said drive shaft pulleys with said second shaft pulleys, one of roller of the loose belt with its belt and disengaging the belt tightening pulley of the tight belt from its belt.

3. In a wrapper feed mechanism, feed rolls engaging a web of wrapping material to feed the same, means for driving said rolls normally at a higher speed than required and comprising a drive shaft and power transmitting means comprisin high speed and low speed belts between said rolls and drive shaft, said belts being loose, idlers for said belts, that one of said idlers for the high speed belt being normally in position to tighten its belt, means to periodically reduce the speed of said rolls to a lower speed than required comprising means to position said idler 'to loosen its belt and to position the other idler to tighten the low speed belt. electromagnetic means adapted to initiate such, last mentioned positioning of said idlers from high to low speed, a photoelectric viewing means periodically viewing spaced spots on said web and actuating said electromagnetic means' in response to impulses originating in said photoelectric means, and a.

continuously driven rotatable cam to permit such positioning initiated by said electromagnetic means and to re-position said idlers in their high speed position. I

4. In a Wrapper feeding and cutting machine,

. means for feeding a web of wrapping material comprising a pair of feed rolls. means for cutting wrappers from said web, photoelectric means for controlling said rolls to feed a predetermined length of material at each operation thereof, and 5 means for driving said rolls comprising a drive" shaft, a second shaft, means drivingly connecting said rolls with said second shaft. a set of pulleys on each of said shafts, the pulleys on one of said shafts being of different diameters, beltsconnecting the pulleys of one set with those of the other, said belts being loose relative to their respective pulleys. and means for selectively tightening said belts to bring the same into tractive relation with the pulleys whereby the rolls are selectively driven at different speeds.

5. In a wrapper feeding machine, means for feeding a web of wrapping material comprising feed rolls, photoelectric means for controlling.

said rolls to feed a predetermined length of material at each operation thereof, and means for driving said rolls comprising a drive shaft, a

second shaft, means drivingly connecting said rolls with said second shaft. a set of pulleys on each of said shafts, the pulleys on one of. said shafts being of difi'erent diameters. belts connecting the pulleys of one set with those of the other, one of said belts being normally tight and the other normally loose relative to their respective p ll y loose belt and loosening said tight belt whereby the rolls are selectively driven at different speeds.

6. In a wrapper feeding machine, means for feeding a web of wrapping material comprising a and means for selectively tightening said pair of feed rolls. and means for driving said rolls comprising a drive shaft. a second shaft, means drivingly connecting said rolls with saidsecond shaft, a set of pulleys on each of said shafts, the pulleys on one of said shafts being of different diameters. belts connecting the pulleys of one set with those of the other, said belts being loose relative to their respective pulleys. and means for selectively tightening said belts to bring the same into tractive relation with the pulleys whereby the rolls are selectively driven at different speeds.

'7. In a machine of the type described, means being loose relative to their'respective pulleys,

and means for selectively tightening said belts to bring the same into tractive relation with the pulleys whereby the rolls are selectively driven at different speeds.

8. In a machine of the type described, means for feeding a web of material at intermittently varying speed comprising a pair of feed rolls, photoelectric means for controlling said rolls to feed a predetermined length of material at each operation thereof, and means for driving said rolls comprising a drive shaft, means drivingly connecting said driven shaft with said feed rolls, a set of pulleys on each of said shafts, the pulleys of each set being respectively aligned and the pulleys on one of said shafts being of different diameters, belts connecting the pulleys of one set with those of the other, said belts being loose relative to their respective pulleys, speed changing means for selectively tightening said belts to bring the same into tractive relation with the pulleys whereby the rolls are selectively driven at different speeds, said speed changing means being normally inoperative, and means responsive to said photoelectric means to render said speed changing means operative in response to material.

9. In a wrapping machine, wrapper feed means for feeding a wrapper to position for wrapping an article therein comprising a pair of feed rolls frictionally engaging a web of wrapping material to feed the same, means for driving said rolls comprising a source of power, a clutch between said source and said rolls, a clutch dog, a member controlled by an article to be wrapped and engageable with said clutch dog to disengage said clutch and disconnect said rolls .from said source,

x, means for transmitting power from said clutch to said rolls, said transmitting means being adapted to drive said rolls at increased or lessened speed and comprising a drive shaft controlled by said clutch and having a set of pulleys,

of difierent diameters thereon, a second shaft, means drivingly connecting said feed rolls with said second shaft, said second shaft having a set of pulleys of different diameters thereon in alignment with the pulleys on said drive shaft, belts connecting said drive shaft pulleys with said second shaft pulleys, said belts being loose on said pulleys whereby insufl'icient traction is afforded to transmit power from one set to the other, and electromagnetic means for selectively tightening said belts to render them operable to transmit power whereby to drive said second shaft and said rolls at different speeds, comprising belt tightening rollers associated with each wrapper feed means for feeding a wrapper towrapping position comprising a pair of feed rolls frictionally engaging a web of wrapping material to feed the same, means for driving said rolls comprising a source of power, a clutch between said source and said rolls, means for transmitting power from said clutch to said rolls, said transmitting means being adapted to drive said rolls at increased or lessened speed and comprising a drive shaft controlled by said clutch and' having a set of pulleys of different diameters thereon, a second shaft, means drivingly connecting said feed rolls with said second shaft,

said second shaft having a set of pulleys thereon in alignment with the pulleys on said drive shaft, belts connecting said drive shaft pulleys with said second shaft pulleys, said belts being loose on said pulleys whereby insumcient' traction is afforded to transmit power from one set to the other, and means for selectively rendering said belts operable to transmit power whereby to drive said second shaft and said rolls at different speeds comprising belt tightening rollers associated with each of said belts, and means for selectively engaging the roller with their respective belts to tighten the same.

11. In a wrapper control mechanism, wrapper feed means for feeding a wrapper to a wrapping position comprising a pair of feed rolls frictionally engaging a web of wrapping material to feed the same, means for driving said rolls comprising a source of power, a clutch between 12. Mechanism for controlling intermittentsupp y of wrappers to a wrapping machine comprising feeding means for a web of wrapping material, cutting means for severing the web at spaced points to provide individual wrappers for use in the wrapping machine, a drive shaft for anvmg said cutting means directly and said feeding means indirectly, a driven shaft for driving said feeding means directly, said drive and driven shafts being provided with pulleys, normally loose belts on said pulleys, said pulleys being of different sizes to drive said driven shaft at two different speeds depending on which belt is tightened, idler rollers connected together for tightening one belt in one position thereof and the other belt in the other position thereof, cam means operable for each wrapper cut from the web of wrapping material to cause the higher speed belt to normally be effective, photoelectric viewing means adapted to view spaced indicia on said web of material, electroresponsive means energized thereby upon passage of one of said indicium relative to said photoelectric means, said electroresponsive means being associated with said idler rollers to shift them to their other position to thereby tighten the slow Speed belt, said cam means effecting return of said idler rollers to high speed position at a predetermined point in the cycle of operation of said cutting means, thereby causing operation of said cutting means to sever a wrapper from said web at a predetermined point relative to one of said indicium thereon.

13. In mechanism for controlling periodic supply of wrappers to a wrapping machine, the combination of feeding means for a web-of wrapping material, cutting means for severing the web at spaced points to provide individual wrappers, a drive shaft for driving said cutting means directly and said feeding means'indirectly, a driven shaft for driving said feeding means directly, said drive and driven shafts being provided with pulleys, normally loose belts on said pulleys, said pulleys being of different sizes to drive said driven shaft at two different speeds alternately depending on which belt is tightened, a first means for tightening one belt, a second means for tightening the other belt, photoelectric viewing means adapted to View spaced indicia on said web of material, electroresponsive means energized thereby upon passage of one of said indicium relative to said photoelectric means, said electronsponsive means being associated with said first means to render it operable, said second means being driven by said drive shaft and operated thereby at a predetermined point in the cycle of operation of said cutting means, thereby causing operation of said cutting means to sever a wrapper from said web at a predetermined point relative to said indicium thereon.

OSCAR SANDBERG.

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