US1931034A

US1931034A - Machine for handling strip material

Info

Publication number: US1931034A
Application number: US445447A
Authority: US
Inventors: Potdevin Adolph
Original assignee: Potdevin Machine Co
Current assignee: Potdevin Machine Co
Priority date: 1930-04-18
Filing date: 1930-04-18
Publication date: 1933-10-17
Anticipated expiration: 1950-10-17

Description

3 Sheets-Sheet 1 A. POTDEVIN MACHINE FOR HANDLING STRIP MATERIAL Filed April 18, 1930 Oct. 17, 1933.

INVENTOR.

law

By I i: a; a6 M ATTORNEYS.

Oct. 17, 1933. v A, POTDEVIN 1,931,034

MACHINE FOR HANDLING STRIP MATERIAL Filed Apl il 18, 1930 3 Sheets-Sheet 2 i 5 INVENTQR.

A TTORNEYS.

Oct. 17, 1933. POTD-EVlN 1,931,034

MACHINE FOR HANDLING S TRIP MATERIAL Filed April 18, 1930 3 Sheets-Sheet 3 IN VEN TOR.

T EY A TORN Patented Oct. 17, 1933 v UNITED STATES PATENT OFFAICE MACHINE FOR HANDLING STRIP MATERIAL Application April 1a, 1930. Serial Nor 445,447 29 Claims. (01. air-2.6)-

This invention relates to an improvement in machines for handling strip material and has for one of its objects the provision of a machine wherein a web of material may be fed through the machine atv proper speed relatively to some mechanism (such as cutting off mechanism, for example) which is to operate on the web and may be correctly positioned relatively to such mechanism.

More specifically my invention relates to machines of the nature of bag making machines wherein the web of which the bags are constructed bears an imprint of some kind, for instance printing at regular intervals along the 5 length of the web, the desideratum being that the paper or web which travels continuously shall be cut off or severed by intermittently 0perated mechanism with predetermined relation to the imprints or other impressions carried by the web.

In such machines the web is frictionally advanced through the machine by the rollers as distinguished from being positively advanced and inasmuch as a certain amount of slippage always occurs in feeding the web it will be obvious that unless some means be provided for regulating the speed of the web as well as its position in the machine the cutting off mechanism will in time be out with respect to the imprints on the web.

Another factor which must be taken into consideration is the fact that the paper varies in length, due to the elasticity of the paper, at-

3 mospheric conditions, or for other reasons, which of course varies the spacing of the printed matter on the web, rendering it necessary to provide some means for overcoming these variations which cannot be avoided.

Furthermore when printing the paper the paper is advanced by friction rollers and if there is any slippage or unequal stretching of the web during the printing operation the impressions on the web will not be uniform, andthis must be taken into consideration when cutting off the web in making the bags.

For clarity of description I will refer throughout this specification to cutting off mechanism as the mechanism relative to which the imprints on the web must be definitely positioned. This cutting off mechanism is, as above mentioned,

intermittently operated at definite intervals. It will be apparent, therefore, that inasmuch as the speed of the cutting off mechanism is constant,

any variation occurring in the spacing of the imprints on the paper or in the speed of the web (bringing of the imprints or impressions into position relatively to the cutting off mechanism) will result in the web being improperly severed or cut off with respect to these impres- The present invention provides a machine, such as a paper bag making machine, for example, in which the feed rollers by which the web is advanced through the machine are driven at an excess speed with respect to the intermittently operated cutting of! mechanism, means being provided whereby the web speed may be reduced without varying the speed of the cutting of! mechanism, so that the correct web length will be advanced between each cutting off operation, means also being provided whereby the position of the web in the machine may be varied so that the cutting of! operation takes place at the proper point relatively to the printed matter on the web.

My invention has for a further object the provision of a mechanism of the general character above referred to in which the loss in bags when making adjustments is reduced to a minimum.

Other objects will appear hereinafter.

In the drawings accompanying this application:

Fig. 1 is a view in plan of my improved machine, the view being taken substantially on the line 1-1 of Fig. 2;

Fig. 2 is a part sectional elevation view of my improved machine; and

Fig. 3 is a view on the line 3--3 of Fig. 2.

Referring to the drawings in detail, the typical example of my invention illustrated comprises the intermittently operated cutting of! mechanism designated 1 and continuously rotated feed rollers 3.

Power for driving the machine is supplied by an electric motor 4 driving a belt or chain 5 mounted on a main drive pulley 6. The main driving pulley 6 is in eifect integral with a gear 7 and the pulley 6 and gear 7 are both loosely mounted on a rotatable shaft 8.

The gear 7 is in constant mesh with a gear 9 carried on a short shaft 10 mounted in a bearing in one side-frame 11 of the machine.

The shaft 10 carries a bevel gear 12 on its inner end, this gear constituting one gear of a primary differential, the rotatable housing of which is designated 13. This differential housing carries a plurality of differential pinions 14 meshing with the gear 12 and with a differential gear 15, the latter being carried by a shaft 16 mounted in the side-frame 17 of the machine at the opposite side from side-frame 11 already referred to.

On the outer end of the shaft 16 is a spur gear 18 meshing with an intermediate gear 19 in mesh with a gear 20 fixed on the shaft 8. The gear 20 is designed to rotate at a faster peripheral speed than the gear 18 for reasons to be hereinafter pointed out. In practice I provide the gear 20 with one less tooth than the gear 18.

The shaft 8 which is mounted in bearings in the side-frames of the machine carries a gear 22 which is fast to the driving pulley 6 and meshes with a gear 23 carried on a shaft 24 mounted in the machine frame. The shaft 24 drives the intermittently operated cutting off mechanism 1. ,Inasmuch as this mechanism constitutes no part of the present invention it has not been shown in any detail.

On the extreme outer end of the shaft 8 is a change gear 25 which is geared to the shaft 26 carrying the feed rollers 3 through a gear train comprising gears 2'7 and 28.

From the description thus far given it will be seen that the shaft 8 and hence the feed rollers 3 will be driven at a higher speed with reference to cutting off mechanism 1 than would be the case if bolts 7' were removed, and bolt 22 which is adapted to hold gear 22 fast on shaft 8 were set up, because of the fact that the gear 22 which drives the cutting off mechanism is fast to the drive pulley 6 which is loose on the shaft 8, while the shaft 8 is driven from gear 18 which has one more tooth than gear 20 fast on'the shaft.

The housing 13 of the primary differential which is always in rotation is provided with a worm gear 29 in constant mesh with a worm 30- mounted on a shaft 31 passing through a secondary differential 32, and carrying at its end a bevel gear 33 meshing with a bevel gear 34 on a shaft 35 provided with a sprocket 36.

The shaft 16 which as above mentioned carries the gear 18 is provided with a sprocket 37 carrying asprocket chain 38 which is also ,mounted on a sprocket 39-on a shaft 40 of a Reeves drive. This Reeves drive comprises a pair of double cone pulleys 42'and 43 and belt 44, the pulley 42 being mounted on the shaft 40 and the pulley 43 of a shaft 45. The shaft 45 carries a sprocket 46 provided with a chain 47 traveling over the sprocket 36 above referred to.

It will be apparent, therefore, that with the shaft 16 in motion the worm 30 will be driven through the Reeves drive above referred to and secondary differential 32 so as to impart motion to the worm gear 29 and the housing 13 of the primary differential.

The housing of the secondary differential 32 is provided with a worm gear 48 meshing with a. worm 49 on shaft 50, this shaft carrying a sprocket 51 in turn carrying sprocket chain 52 driven by a sprocket 53 on the armature shaft of a regulating or control motor 54. The motor 54 is intermittently operated and only when necessary.

From the foregoing, it will be apparent that rotation is imparted to the shaft 26 of the feed rollers 3 from the driving motor 4, belt or chain 5, pulley 6,

gears

7 and 9, primary differential,

gears

18, 19 and 20 at a speed dependent upon the speed of the drive pulley 6 and the ratio of the gear 18 to the gear 20. In the present instance, as above pointed out, the gear 20 has one less tooth than the gear 18, consequently the shaft 8 will be driven slightly faster than the pulley 6. Shaft 24 runs at constant speed.

The worm wheel 29 fast on the housing 13 of the main or primary differential is constantly rotating through the Reeves drive which is driven off the shaft 16 of the primary differential and consequently it will be apparent that the speed of the shaft 8 can be varied to vary the difference in speed between the feed rollers 3 and the cutting off mechanism 1 by regulating or varying the setting of the Reeves drive, anyvariation in the setting of this drive varying the speed of the worm 30 and hence of the worm wheel 29 which will, of course, vary the speed of rotation of the differential housing 13. It will be appreciated of course that with the differential housing 13 in rotation and always in the same direction the speed of shaft 8 is lower than would be the case if this housing were stationary.

This arrangement, therefore, provides a convenient apparatus for regulating the speed of the paper or other web material being advanced through the machine by the feed rollers 3 so that the length of paper fed between each operation of the cutting off mechanism may be properly controlled. This arrangement, however, is not all that is required in a machine of this character in that it merely permits a regulation of the machine whereby the proper amount of paper will be advanced between each cutting off operation.

If, however, the web is not properly positioned in the machine so that the printing on the web is not properly positioned with respect to the cutting off mechanism, or if the printing is not properly spaced on the web, it will be obvious that another adjustment of the web must be .1

made. It is for effecting this adjustment that I have provided the control or regulating motor 54. Assuming that the operator watching the machine observes that the cutting off mechanism is operating improperly with respect to the printed matter on the paper web, in other words, sees that the web is not in proper position with respect to the cutting off operation, it is merely necessary to energize the motor 54, to effect,

through the worm 49 and worm gear 48, rotation of the housing 32 of the secondary differential. This rotation of the otherwise stationary housing of this differential will of course effect a momentary change in the speed of the shaft 31 carrying the worm 30, thereby to effect a variaj,

tion in the speed of the housing 13 of the primary differential with a resultant change in the speedof the shaft" 8 and a necessary temporary altered speed of rotation of the feed rollers 3. Operation of the motor 54 is continued until the operator sees that the paper being operated upon has been brought to proper position so as to bring the printed matter carried by the web into predetermined relation with respect to the cutting off mechanism 1.

When the web has thus been brought up to proper position with respect to the cutting oif mechanism the circuit of the motor 54 is opened.

My invention as applied to the manufacture of paper bags, for instance, is of great advanfor any reason should vary excessively. With my improved apparatus no perforating of the paper is required, nor is the paper advanced any differently than in machines which have been in use for years so far as the construction of the feed roller is concerned.

It will be appreciated also from the foregoing that my improved apparatus is of great advantage in the initial starting up of the machine in that it enables the paper initially to be accurately located with the minimum loss of stock, and permits of accurate adjustment of the web from time to time during operation with the minimum of effort and with the minimum loss in material being operated upon.

I have described my invention specifically in connection with cutting off mechanism in a bag making machine. This was for the purpose of illustration and clarity of description only, inasmuch as it will be obvious that my invention is equally applicable to other uses and other machines. The cutting'oif mechanism, for example, might be substituted by some other operation which is to be performed on the web with particular relation to certain predetermined areas of the paper. It is to be understood also that the printing on the web may be substituted by other devices the location of which must bear a predetermined relation to the point at which the paper is severed or at which some other operation is to be performed.

What I claim is:

1. Web handling mechanism comprising in combination friction rolls for advancing the web, constant speed mechanism for intermittently operating on the advancing web, adjustable variable speed mechanism tending to drive said rolls at'all times at a speed tending to advance the web in excess of the necessary distance between consecutive operations of the intermittent mechanism, and means for adjusting the position of the web with respect to the intermittent mechanism.

2. Web handling apparatus comprising in combination friction rolls for advancing the web, constant speed mechanism for intermittently operating on the advancing web, a constant speed prime mover for driving said intermittent mechanism and for driving said rolls at all times at a speed tending to advance the web in excess of the required distance between consecutive operations of the intermittent mechanism, and adjustable transmission mechanism intermediate the prime mover and said rolls for varying the position'of the web with respect to the intermittent mechanism.

3. Web handling apparatus comprising in combination friction rolls for advancing the web, constant speed mechanism for intermittently operating on the advancing web, a constant speed prime mover for driving the rolls and intermittent mechanism, the rolls running at such speed that the web will tend to be advanced not less than the required distance between consecutive operations of the intermittent mechanism, variable speed transmission mechanism intermediate the prime mover and rolls for varying the web speed, and additional variable speed transmission mechanism for varying the position of the web in the machine with respect to the intermittent mechanism.

4. Web handling apparatus comprising in combination friction rolls for advancing the web, constant speed mechanism for intermittently operating on the advancing web, a prime mover for driving the intermittent mechanism, a differential transmission intermediate the prime mover and rolls for driving the rolls at such speed that the web will always tend to be advanced not less than the necessary distance between consecutive operations of the intermittent mechanism, means for altering said differential transmission to effect a permanent change in the web speed, a second differential, and a motor for varying the speed thereof whereby the position of the web'relatively to the intermittent mechanism is varied.

5. In a machine for handling strip material a pair of feed rollers for frictionally advancing a web of material, means including a pair of differentials for transmitting power from a prime mover to said rollers to drive the same, constant speed mechanism driven by said prime mover for intermittently operating on the advancing web, the said rollers being driven at such speed that the web at all times will tend to advance not less than the desired distance between consecutive operations of the intermittent mechanism, means for adjusting one of said differentials thereby to vary the other and effect a slowing up of the web to shift the web relatively to the intermittent mechanism, and means for effecting a permanent variation in the surface speed of the feed rollers without varying the speed of the prime mover.

6. In a machine for handling strip material the combination of a pair of feed rollers frictionally to advance the strip or web, constant speed mechanism for intermittently operating on said web, said rollers at all times tending to advance the Web not less than the necessary distance between consecutive operations of the intermittent mechanism, means for reducing the speed of said rollers momentarily to vary the setting or position of the web with respect to the intermittent mechanism, and means for varying the speed of said rolls permanently to vary the speed of the web, each of said means being operative while the machine is in opera-.

tion.

7. In a machine for handling strip material the combination of a pair of feed rollers for frictionally advancing a strip or web, constant speed mechanism for intermittently operating on said web, said rollers at all times tending to advance the web not less than the necessary distance between consecutive operations of the intermittent mechanism, a prime mover for driving said rollers and intermittentmechanism, transmission means interposed between the prime mover and said rollers for the transmission of power to said rollers, means for permanently varying said power transmitting means, and electrically operated means for adjusting said transmission mechanism to vary temporarily the surface speed of the feed rollers to vary the position of the web with respect to the intermittent mechanism, each of said means being operative while the machine is in operation and the prime mover running at constant speed.

8. In a machine for handling strip material the combination of a pair of feed rollers for frictionally advancing a strip or web, constant speed intermittent mechanism for operating on said advancing web, a prime mover for driving said rollers and intermittent mechanism, said rollers at all times tending to advance the web not less than the necessary distance between consecutive operations of the intermittent mechanism, means for permanently varying the surface speed of said feed rollers, and an electrically operated means for varying the surface speed of said rollers momentarily, each of said means being operative while the machine is in operation and the speed of the prime mover remains unvaried.

9. In a machine for handling strip material the combination of a pair of feed rollers for frictionally effecting the continuous advance of a strip or web, driving mechanism for said rollers including a pair of differentials, constant speed intermittent mechanism for operating on said advancing web, said rollers traveling at such speed that the web at all times will tend to be advanced not less than the necessary distance between consecutive operations of the intermittent mechanism, and an electric motor for varying the relation of said differentials to vary temporarily the surface speed of said rollers to reduce the speed of the web whereby the web will be shifted with respect to its position relatively to the intermittent mechanism.

10. Web handling mechanism comprising in combination constant speed mechanism for intermittently operating on an advancing web, friction rolls for advancing the web to the intermittently operating mechanism, the friction rolls at all times tending to impart a linear speed to the web sufficient to advance the web in excess of the required distance between consecutive operations of the intermittent mechanism, and means operating continuously for reducing the speed of said rolls whereby only the required amount of web is advanced between consecutive operations of the intermittent mechanism.

11. Web handling apparatus comprising in combination constant speed mechanism for intermittently operating on an advancing web, friction rolls for advancing the web to the intermittently operating mechanism, the friction rolls at all times tending to impart a linear speed to the web suflicient to advance the web in excess of the required distance between consecutive operations of the intermittent mechanism, and adjustable means operating continuously for reducing the speed of said rolls whereby only the required amount of web is advanced between consecutive operations of the intermittent mechanism.

12. Web handing mechanism comprising in combination constant speed mechanism for in-,

termittently operating on an advancing web, friction rolls for advancing the web to the intermittently operating mechanism, the friction rolls at all times tending to impart a linear speed to the web suflicient to advance the web in excess of the required distance between consecutive operations of the intermittent mechanism, and adjustable means operating continuously for permanently effecting reduction in speed of said rolls whereby the web speed is altered so that the web is advanced only the required distance between consecutive operations of the intermittent mechanism.

13. Web handling apparatus comprising in combination constant speed mechanism for intermittently operating on an advancing web, friction rolls for advancing the web to the intermittently operating mechanism, the friction rolls at all times tending to impart a linear speed to the web sufficient to advance the web in excess of the required distance between consecutive operations of the intermittent mechanism,

and adjustable differential mechanism for temporarily effecting a reduction in the speed of said rolls to vary the setting of the web with respect to the intermittently operating mechanism. Y

14. Web handling mechanism comprising in combination constant speed mechanism for in termittently operating on an advancing web, friction rolls for advancing the web to the intermittently operating mechanism, the friction rolls at all times tending to impart a linear speed to the web sufficient to advance the web in excess of the required distance between consecutive operations of the intermittent mechanism, and adjustable means for temporarily effecting a reduction .in the speed of said rolls to vary the setting of the web with respect to said intermittently operating mechanism, and means operating continuously for permanently effecting 'a reduction in the speed of said rolls whereby the web speed is altered so that the web is advanced only the required distance between consecutive operations of the intermittent mechanism.

15. Web handling apparatus comprising in combination feed rollers for advancing the web, constant speed mechanism for intermittently operating on the advancing web, a constant speed prime mover for driving the rollers and intermittent mechanism) the rollers running at such speed that the web will tend to advance not less than the required distance between consecutive operations of the intermittent mechanism, means for increasing or decreasing selectively the surface speed of said rollers, and means for permanently varying the surface speed of said rollers, each of said means being operative while maintaining constant the speed of the prime mover.

16. Web handling apparatus comprising in combination a pair of feed rollers for advancing the web, constant speed mechanism for intermittently operating on the advancing web, a constant speed prime mover for driving the rollers and intermittent mechanism, the rollers running at such speed that the web will tend to advance not less than the required distance between consecutive operations of the intermittent mechanism, means for varying the surface speed of said rollers intermittently to vary the setting of the web, and means for varying said surface speed permanently, each of said means being operative while the machine is in opera- 17. Web handling apparatus comprising in combination means for advancing the web, constant speed mechanism for intermittently operating on the advancing web, a prime mover for driving the web advancing means and the intermittent mechanism, the web advancing means running at such speed that the web will tend to advance not less than the required distance between consecutive operations of the intermittent mechanism, and means for varying the speed of the web advancing means permanently while the machine is in operation and while maintaining constant the speed of the prime mover.

18. Web handling apparatus comprising in combination web advancing means, constant speed mechanism for intermittently operating on the advancing web, the web advancing means tending to advance the web not less than the required distance between consecutive operations of the intermittent mechanism, means for temporarily varying the speed of the web advancing means to vary the setting of the web, and

means for permanently varying the speed of the web advancing means, each of said means being operable while the machine is in operation. 19. Web handling apparatus comprising in combination web advancing means, a prime mover therefor, constant speed mechanism for intermittently operating on the web, said prime mover tending to advance the web not less than the required distance between consecutive operations of the intermittent mechanism, means for temporarily varying the linear speed of a web being handled to vary its setting, and means for permanently varying the linear speed of the web, each of said means being operative while the machine is in operation and while maintaining constant the speed of said prime mover.

20. Web handling apparatus comprising in combination, web advancing means, a prime mover therefor, constant speed mechanism for intermittently operating on an advancing web, said prime mover tending to advance the web not less than the required distance between consecutive operations of the intermittent mechanism, means for temporarily and means for permanently varying the linear speed of a web being advanced by the machine, each of said means being operative with the prime mover in operation and running at. a constant speed.

21. Web handling apparatus comprising in combination web advancing means, constant speed mechanism for intermittently operating on the advancing web, said web advancing means running at such speed that the web will tend to advance not less than the required distance between consecutive operations of the intermit-' tent mechanism, means for temporarily and means for permanently varying the linear speed of the web, each of said means being operative with the web in motion.

22. Web handling apparatus comprising in combination web advancing means, constant speed mechanism for intermittently operating on the advancing web, the web advancing means running at such speed that the web will tend to advance not less than the required distance between consecutive operations of the intermittent mechanism, means for temporarily and means for permanently varying the linear speed of the web, said means being operative independently of each other and while the web is in motion.

23. Web handling apparatus comprising in combination a pair of feed rollers for advancing the web, constant speed mechanism for intermittently operating on the advancing web, a prime mover for driving the rollers and intermittent mechanism, the web advancing rollers running at such speed that the web will tend to advance not less than the required distance between consecutive operations of the intermittent mechanism, a variable drive and differential interposed between the prime mover and said rollers, and means for varying the action of the said drive and differential to permanently vary the surface speed of the feed rollers while maintaining constant the speed of the prime mover.

24. Web handling apparatus comprising in combination a pair of feed rollers for advancing the web, constant speed mechanism for intermittently operating on the advancing web, a prime mover for driving the rollers and intermittent mechanism, the rollers running at such speed that the web will tend to advance not less than the required distance between consecutive operations of the intermittent mechanism, means including a pair of differentials intermediate said prime mover and said rollers, and means for adjusting one of said differentials thereby to vary the other of said differentials to effect a momentary variation in the surface speed of the said feed rollers and operative while the differentials are in operation.

25. Web handling apparatus comprising in combination web advancing means, constant speed mechanism for intermittently operating on the advancing web, a prime mover for the web advancing means and said constant speed mechanism, the web advancing means running at such speed that the web willtend to advance not less than the required distance between consecutive operations of the intermittent mechanism, a pair of differentials cooperable with the prime mover and web advancing means, and means for shifting the housing of one differential to effect a change in the relation of the two differentials to vary momentarily the speed of the web advancing means.

26. Web handling apparatus comprising in combination a pair of feed rollers for advancing the web, constant speed mechanism for intermittently operating on the advancing web, drive mechanism therefor, said feed rollers running at such speed that the web will tend to advance not less than the required distance between consecutive operations of the intermittent mechanism, a pair of differentials cooperable with the feed rollers and drive mechanism, and means for shifting the housing of one differential to shift the pinions carried thereby, thereby to effect a change in the relation of the two differentials to vary momentarily the surface speed of the rollers.

27. Web handling apparatus comprising in combination a pair of feed rollers foradvancing a web, constant speed mechanism for intermittently operating on the advancing web, drive mechanism for said rollers and constant speed mechanism, the rollers running at such speed that the web will tend to advance not less than the required distance between consecutive operations of the intermittent mechanism, a pair of differentials cooperable with the said drive mechanism and constant speed mechanism, the housing of one differential normally being stationary, and means for rotating said normally stationary differential housing to vary the relation between the two differentials, said change effecting a change in surface speed of said rollers with a corresponding change in linear speed of the web.

28. Web handling apparatus comprising in combination a pair of feed rollers for advancing a web, constant speed mechanism for intermittently operating on the advancing web, a prime mover for the feed rollers and constant speed mechanism, the rollers running at such speed that the web will tend to advance not less than the required distance between consecutive operations of the intermittent mechanism, a pair of differentials intermediate the prime mover and said feed rollers, means for adjusting one of said differentials thereby to vary the other and effect a momentary variation in the surface speed of the said feed rollers, and means for effecting a permanent variation in the surface speed of the feed rollers without varying the speed of the prime mover.

29. Web handling apparatus comprising in combination web advancing means, constant speedmechanism for intermittently operating on running at such speed that the web will tend to advance not less than the required distance between consecutive operations of the intermittent mechanism, a pair of difierentials for regulating the speed oi. said web advancing means, means for shifting the housing of one differential to effect a change in the relation of the two difier- ADOLPH POTDEVIN.