US1881589A - Web roll controlling device for printing machines - Google Patents

Description

A. J. HORTON Get. 11, m2.

WEB ROLL CONTROLLING DEVICE FOR PRINTING MACHINES Filed April 27, 1929 2 Sheets-Sheet A. J. HORTON WEB ROLL CONTROLLING DEVICE FOR PRINTING MACHINES Filed April 27, 1929 2 Sheets-Sheet 2 prevent it runnin I is decelerated q-uic ly; that will act when the machine is started, to instantly remove the Patented Oct. 1-1, 1932 UNITED STATES PATENT OFFICE =--or'm3w YORK, N. Y.,

ALBERT'J'. HORTON, OF WHITE PLAINS, NEW YORK,'ASSIGNOR TO B. HOE & CO., INC.,

' A CORPORATION OF NEW YORK WEB-ROLL CONTROLLING DEVICE FOR PRINTING MACHINES Application filed April 27,

I running to the press; that will apply a brake to overcome the momentum of the roll and ahead when the machine lbrakevpressurepreviously applied to the roll to stop-lit, and thus avoid imposing excessive strain on the web during the starting period;

" great'brake'pressure cannot be applied too' fand'thatwill include-means to so control the action of the mechanism that a relatively ra idly.

.= rolls, of ,whereby the device will bejsimple, durable and inexpensiyfliinionstruction, as well ascient in its user;

' t is. also an object of the. invention to provide a' tension device: for F controlling web generally improved construction,

convenient, pi'acticl,,,serviceable and elfi- "With the foregoing and other objects in I view, which'willj. appear as the; description proceeds, the invention resides in'the combination and arrangement of parts, and in the details of construction hereinafter described and claimed, itbeing understood that various changes in the precise embodiment of. the invention herein disclosed may be made within the scope of what is claimed withoutdeparting from the spirit of the inv vention.

Web roll tension devices have been used in the'past in which a floating roller such as is herein shown was used to automatically operatea brake which inturncontrolled the rotation of vtheweb roll,"the object being to "I n'iaintaina s'ubsta'ntially constant tension on the unwindingwehand a dash pot has been I used to'preyentrapi oscillation of the'fioat- M o'rse {Patent 1,103,-

1. f ors' v c t both the rise and fall of the floating roller. A mechanism in the'same class is disclosed in Jones Patent 1,395,830, dated November 1,

e'dash pot'restrains 1929. Serial No. 358,481.

1921, in which the dashpot operates to retard the rise of the floating roller but allows it to descend without restraint.

When a printing machine having the tension' mechanism herein shown is running, a tightening of the web reduces the brake pressure and a slackening of the web increases it.

When the machine is decelerated rapidly there is a tendency for theweb roll to run ahead but the slack thus formed allows the floating roller to descend andincrease the brake pressure thereby checking the rotation of the roll.

. After a rapid deceleration the brake will I remain applied to the roll with a heavy pressure but when the press is restarted the brake pressure will be instantly removed and thus allow the roll to rotate freely and avoid excessiveostrain on the web.

- In the tension devices of this class that do not use a dash pot or itsequivalent, under some conditions, particularly when running at certain slow speeds and with a small web .formed allows the roller to descend quickly and apply the brake with force sufficient to stop the roll. The continued pull of the web running to the machine then raises the floating roller and the cycle is repeated indefinitely'with increasingly violent oscillation of the floating roller and it ultimately breaks the web in many instances.

The use of a dash pot connected to the sup- I port for the floatin roller retards its motion and prevents the hunting action; However, as heretofore. used, it also prevents instantaneous action offloating roller to relieve thebrake pressure when the machine is startedyand consequently unless the brake is slackened manually, excessive strain is imiposed on the web until the dash pot allows the floating roller to rise. The mechanism disclosed herein, avoids this difliculty.

In many cases the web'rolls are not evenly necessary to 4 -jacent to th wound, being elliptical in section instead of circular. Due to their inertia, the rolls tend to rotate at a constant speed, and when feeding a web from a poorly wound roll it is provide means to compensate for the irregularity in the speed of the web as it unwinds. Rollers carried on spring supported bearings and around which the webs are carried have ben satisfactorily used for this purpose, but when web rolls of varying size are used, it is necessary to provide a separate roller of the correct length for each width of web, for if a narrow web is run adend of a roller adapted to carry a full widti web, thepull of the web at the instant it is feedingfrom a low spot on the roll, will cause but one of the spring bearings to recede and in consequence one edge of the web is subjected to. a strain whichfrequently breaks it.

A floating roller' that has the required amount of free action will follow the irregularities of the running web, and when supported as herein shown is adapted to operate with either wide or narrow webs.

Figure 1 of the drawin s shows one form of the invention as applie to a printing machine, and as viewed from the side of the machine.

Figure 2 shows a modified arrangement, the view beingsimilar in most respects to I Figure 1.

' partly 3 is a view partly in section and partly broken away,vshowing the arrangement depicted in Figure 1, and as viewed in the direction of arrow 3 of that figure.

Figure 4 is a view partly in section and broken away, showing the arrangement depicted in Figures 1 and 3, and as viewed in the-direction of arrow 4 of Figure 3. Figure 5 is a view partly broken away, showing the arrangement depicted in Figure 2 and as viewed in the direction of arrow 5 of t at figure.

Figure 6 is a view partly in section and partly broken away showing the arrangement depicted in Figures 2 and 5, and as viewed in the direction of arrow 6 of Figure 5.

Figure 7 is a fragmentary view partly in section showing the eccentric by means of which the brake is operated.-

Referring to the drawings, 11 and 11' indicate frame members of aprinting machine, and 12a bracket secured thereto which is Figure 1 made with a well known form of open bearing for the spindle 13, to which a web roll 14 maybe secured.

A V brake sheave 15, of the usual form is secured to the spindle 13, and is engaged The handwheel 23 has a right and left hand v threaded shaft 24 which engages the corre- 'This is a well known spondingly screw threaded sleeves 25 and 26. The sleeve 25 is pivoted on the arm 18, and the sleeve 26 engages a stud on the arm 17. form of hand tension device for controlling the roll as the web is drawn from it by the machine. The handwheel 28, which is also old in the art, is secured to a threaded shaft and serves to move the brake mechanism, and with it, the spindle 13, for adjusting the position of the web roll axially.

The shaft 21 is free to rotate in the bracket 22, and has an eccentric portion 29, which rotates in the tub of the arm 18. Thus, by

rotating the shaft 21, the pressure of the adjustable by means of screws and 36.

The position of the roller may thus be adjusted to make it bear properly against the web 'even though the roll in use may be larger on one end than on the other.

The web is then led to and around the float ing roller37 which is rotatably supported in the arms 38 and 38, secured to the shaft 39, which is journaled in hearings inthe frames 11 and 11'. The web then passes around the roller 41, carried in fixed bearings secured to the frames 11 and 11, and is led to the printing cylinders.

An arm 42 is secured to the shaft 39, and is provided with a rod 43, on which a counter weight 44 is fitted to slide. -A projection 44 on the weight engages with any one of a series of notches 45 formed on the arm 42. By turning the weight on the red, the projection is disenga ed from the notch and the weight may then ie moved lengthwise on the rod and allowed to rest in another notch. By this means the effective weight of the floating roller 37 may be varied in order to regulate the tension on the web running to the machine. e

A connecting rod 46 is pivotally connected to the arm 42, and to a lever 47, secured to the shaft 21. It will thus be understood that a rise or fall of the 'floating roller 37 will result in turning the shaft 21, and reducing or increasing the brake pressure.

A. dash pot is pivoted on a stud 49 secured to the frame 11, and has a piston 51 connected-to a piston rod 52, the other end of which slides in a swivel connection 53, rotatably secured to the arm 38. A collar 54 having a sleeve 54, is secured to the piston rod and provides an abutment for a relatively light spring 55, the other end of which bears against the swivel connection 53. Another the collar 56 is screw threaded on the end of the piston rod 52 and may be locked in lace by a set screw. By turning the collar 56,

the gap between the sleeve 54' andltheconnection 53 may be adjusted to vary the free downward movement of the floating roller.

a check valve in the reverse which obstructs its passage In the preferred construction,

direction. the piston tending therethrough and a disc 58, is pressed against the openings by the spring 59,-the opposite end of which is fastened to a projecting portion of the piston rod 52,

hen the piston is raised the pressure of fluid overcomes the pressure of the s ring and the openings allow the fluid to pass reely from the top to the bottom of the piston, but when the piston is pressed down, the disc is forced against the openings and closes them, except for a small aperture, the size of which maybe regulated by the adjusting screw 61, which is screwed into the piston and the end ofwhich bears against the disc 58.

end of the sleeve 54 sto ed 1' kl PP (1116 y floating roller.

It will be seen that the floating roller may rise'unrestricted by the dash pot, and that by compressing the spring 55, it may also descend freely for a limited distance which is governed by the space between the upper and the swivel connection 53, but any further downward'inotion is retarded by the dash pot.

It has been found that the mechanism herein disclosed can be so adjusted that the floating roller will freely follow the irregularities in the web being drawn from the roll, and that the dash pot can be regulated to permit the floating roller to descend with sufficient rapidity to prevent'the roll from overrunning when the press is decelerated or and still act to prevent a hunting action of the floating roller.

In the form of the invention shown in F igure 2, the floating roller is arranged to operate in thejopposite direction from thatshown in, Figure 1, and an adjustablesprin the effective weight of the In this form the adjustable is used 130* vary roller 32 is omitted and its function per- I formed by the floating roller, which in this arrangement has one of so made that it is adjustable with relation to the other arm.

' As shown in Figures 2, 5 and 6, the floating ,roller 62 is rotatably supported in arms 63 and 63', the latter being secured to the shaft 64, which is journa'led in brackets 65 and 65. The arm 63 is adjustably -connected to the arm 66 by means of the screw 67, which passes through a clearance hole in the arm 66, is

provided with athrust collar 68, and is screwed into a projecting lug formed on the 51 is formed with openings 57 ex-.

its supporting arms arm 63. 'Arm 66 is secured to the shaft 64, but arm 63 may be turned on the shaft by turning the screw 67 It will be understoodnected toa head formed on one. end of the rod 71, and the other end .of thesrod slides in the swivel connection 72,

which is supported so as to turn in the bracket '69.

The handwheel 73 is screw threaded on the rod 71, and presses against the spring 74:, the'cother end of which bears against the swivel connection to lift the floating roller, and may be adjusted by turning the handwheel. An adjusting collar 75 is screwed on the lower end of rod 71 and serves to limit the upward motion of the floating roller.

An arm 76 is secured to the shaft 64 and is pivotally connected to the rod 77, which corresponds with rod 46 of Figure 1. I

The web is led from the roll, to and around the' roller 78 which is carried in bearings fixed to the frames 11 and 11, thence around the floating roller 62 and from there to the printin cylinders.

It wi be seen that with this arrangement, a tightening ofthe web'will pull the floating roller downand release the and that when the web slackens the floating roller will rise and tighten the brake.

In operation, after a web roll is'placed in position and the web carried around the rollers as shown, the press is started and the brake gradually tightened by means of the handwheel 23. In the arrangement shown in Figure 1, as the handwheel is screwed up, the floating roller will rise. It is so adjusted that the'roller assumes the position shown in g the drawings, and it'is unnecessary to change the setting while the Web from the roll is being run ofi'. Inthe arra ngment shown in Figure 2, tightening the brake by means 01 the handwheel will cause the floating roller to descend.

It will be seen that a mechanism has been provided that will act to restrain the rotation of a web roll when the web being fed therefrom slackens, and reduce the restraint when the webtightens, that will prevent a too rapid application of the restraining action, but will permit the restrain to be quickly removed when the machine'is. started, and will follow irregularities in the run of the web coming from the roll and maintain a substantially 7 2. The spring thus tends brake pressure,

constant tension on the web running to the machine. 1 What I claim is:

1. In a web roll controlling device, a floating roller moving transversely to its axis in response to variations in the slack of the unwinding web, a braking mechanism connected thereto, which acts to restrain the rotation of the roll when the web slackens and to reducethe restraint when the web tightens, and a retarding device arranged to permit free movement of the floating roller when the web tightens, and to restrict such movement when the web slackens.

2. In a web roll controllin device, a floating roller moving transverseIy to its axis in response to variations in the slack of the unwinding web, a braking mechanism connected thereto, which acts to restrain the rotationof the roll when the web slackens and to reduce the restraint when the web tightens,

- and a retarding device arranged to permit free movement of the floating roller when theweb tightens, and to restrict such movement when the web slackens morethan a predetermined amount. I

3. In a web rollcontrolling device, a floating'roller moving transversely to its axis in response to variations in the slack of the unwinding web, a braking mechanism connected thereto which acts to restrain the rotation of the roll when the web slackens and to reduce the restraint when the web tightens, and a retarding device arranged to permit free movement of the floating roller normally, but to restrain the movement which tightens the brake when such movement exceeds a predetermined extent. r

4. In a web roll controlling device, a floating roller moving transversely to its axis inresponse tovariations in the slack of the unwmding web, a braking mechanism connected thereto which acts to restrain the rotation of the roll when the web slackens and to reduce the restraint when the web tightens, and a retarding device arranged to permit an exmg roller moving transversely to its axis in I tended free movement of the floating roller when the web tightens, and a limited free movement when the web slackens, but acting to retard the movement of the roller when a slackness of the web permits the movement to exceed a predetermined extent.

5. In a web roll controlling device, a floating roller moving transverse y to its axis in response to variations in the slack of the unwinding web, a braking mechanism connected thereto which acts to restrain the rotation of the roll when the web slackens and to reduce the restraint when the web tightens, a retarding device arranged to permit an extended free movement of the floating roller when the web tightens and when the web slackens to permit a limited free movement, and means to vary the extent of said limited free movement.

6. In a web roll controlling device, afloat ing roller moving transversely to its axis in response to variations in the slack of the unwinding web, a braking mechanism connected thereto, which actsto restrain the rotation of the roll when the web slackens and to reduce the restraint when the web tightens, and a retarding device arranged to permit an extended free movement of the floating roller when the web tightens, and when the web slackens, to permit a limited free movement and an extended retarded movement.

7. In a web roll controlling device, a floating roller moving transversely to its axis in response to variations in the slack of the unwinding web, a braking mechanism connected thereto which acts to restrain the rotation of the roll when the web slackens and to reduce the restraint when the web tightens,and a retarding device arranged to prevent rapid application of the restraining action beyond that necessary to allow the roller to follow irregularities in the running of the web as it is drawn from the roll; said retarding device being arranged to freely permit removal of the restraining action when the web tightens.

8. In a web roll controllin device, a floating roller moving transverse y to its axis in response to variations in the slack of the unwinding web, a braking mechanism con nected thereto, which acts to restrain the rotation of the roll when the web slackens and to reduce the restraint when the web tightens, and a retarding device arranged to per mit free movement of the floating roller when the web tightens, and to restrict such movement when the web slackens, said retarding device having a moving element;

loosely connected to one of the members that move in response to variations in the slack o f the web and being so biased that the looseness will permit a limited movement of the member in one direction without such movement being restricted by the retarding device.

9. In a web roll controlling device, a floatresponse to variations in the slack of the unwinding web, a braking mechanism connect:

ed thereto, which acts to restrain the rotation of the roll when the web slackens and 'to reduce the restraint when the web tightens, and a retarding device arranged to per mit free movement of the floating roller when the web tightens, and to restrict such;

the floating roller in the direction which restrains the roll.

10. In a web roll controlling device, a suitably supported floating roller moving trans:

mamas versely to its axis in response to variations in the slack of the unwinding web a braking mechanism connected thereto, which acts to restrain the rotation of the roll when the 5 web slackens and to reduce the restraint when the web tightens, and a retarding device arranged to permit free movement of the floating roller when the web tightens, and to restrict such movement when the web slackm ens, said retarding device comprising a dash pot having a piston with a piston rod loosely connected to the floating roller support and so biased that the looseness will permit a limited movement of the roller support,

15 unrestricted by the dash pot.

11. In a web roll controlling device, a floating roller moving transversely to its axis in response to variations in the slack of the unwinding web, a braking mechanism connected thereto which acts to restrain the rotation of the roll when the web slackens and to reduce the restraint when the web tightens, and means arranged to permit sufficient free movement of the floating roller a" to allow it to follow irregularities in the running of the web as it is drawn from the roll, but restraining the movement which tightens the brake, when such movement ex- "ceeds a predetermined extent. 80 12. In a web'roll controlling device, a floating roller moving transversely to its axis in I response to variations in the slack of the unwinding web, a braking mechanism connected thereto, which acts to restrain the ro- 86 tation of the roll when the web slackens and to reduce the restraint when the web tightens, and means for varying the pressure of the floating roller on the web; said means including an arm having'a rod, a weight slid- 40 able thereon, and locking means on the arm engaging the weight to hold it in position, said loc ing means being disengageable by turning the weight.

,13. In a web roll controlling device, a

floating roller moving transversely to its axis in response to variations in the slack of the unwinding web, a braking mechanism connected thereto, which acts to restrain the rotation of the roll when the web slackens and to reduce the restraint when the web tightens, a device arranged to retard excessive action of the floating roller in one direction, and means for varying the pressure of the roller on the web; said means com- 55 prising an arm having a rod, a weight slidable thereon and locking means on the arm engaging the weight to hold it in position,

said locking means being disengageable by turning the weight.

In testimony whereof I aflix m signature.

ALBEiz'r J. ORTON.

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