US1670637A - Web-tension mechanism - Google Patents

Description

May 22, 1928. 1,670,637

D. J. SCOTT WEB TENSION MECHANISM Filed July 50, 1925 6 Sheets-Sheet l 33 Show/@113 May 22, 1928.. 1,670,637

D. J. sco'r'r WEB TENSION MECHANISM 6 Sheets-Sheet 2 May 22, 1928. 1,670,637

D. J. SCOTT WEB TENS ION MECHANISM Filed July 30, 1925 6 Sheets-Sheet 3 May 22, 1928.

D. J. scoTT WEB TENSION MECHANISM s sheets-sheet 4 Filed July 30, 1925 May 22, 1928., 1,670,637

D. J. SCOTT WEB TENS I ON MECHANI SM Filed July 30, 1925 6 Sheets-Sheet 5 May 22, 1928.

v D. J. SCOTT WEB TENSION MECHANISM Filed July 30, 1925 6 Sheets-Sheet 6 1 M :g W a 53 W 53 51 j 1 12 55 fi 10 F It as a Patented May 22, 1928 UNITED STATES 1,670,637 PATENT OFFICE.

DAVID J. SCOTT, OF PLAINFIELD, NEW DAVID J'. SCOTT EXEGUTORS OF THE JERSEY, ASSIGNOR TO ISABELLA SCOTT AND ESTATE OF WALTER SCOTT, DECEASED, DOING BUSINESS AS WALTER SCOTT & COMPANY, OF PLAINFIELD, NEW JERSEY.

WEB-TENSION MECHANISM.

Application filed July 30, 1925. Serial No. 46,939.

This invention relates to web tension mechanism for rolls of paper used in printing or other machines.

It is customary in the art, at the present time, when a feeding web becomes slack to increase the braking action on the web roll and, conversely, when the web becomes taut to decrease the braking action on the'web roll. Such devices are shown in the Letters Patent to Scott No. 558,426 of April 14,

1896, and in the Letters Patent to Jones No.

1,395,830 of Nov. 1, 1921.

So far as my knowledge goes, this braking action has always heretofore been applied to 1 a roll mounted on a spindle that extends [through the core of the roll; and, as these spindles are of considerable weight and length, it is an awkward and burdensome \task to manipulate the spindles and rolls.

2 One object of my invention is to provide braking means that will be associated with chucks; that is to say, short shafts having engaging means at the ends that enter the hollow cores of the rolls for a short distance only from each end of the roll.

lVith this and other objects in view, the invention consists in the hereinafter described arrangement of parts, combination of elements and features of construction, several preferred embodiments of which are shown in the accompanying drawings in which:

Fig. 1 is a vertical sectional view inthe plane of line 1-1 of Fig. 2 of a device embodying one form of the invention:

Fig. 2 is an end view, partly in section and broken away, of the parts shown in Fig. 1, looking in the direction of arrow 2 of Fig. 1:

Fig. 3 is a side elevation of the actuator for the brake mechanism and adjacent elements:

Fig. 4 is an end elevation of the parts shown in Fig. 3 looking in the direction of arrow 4 of Fig. 3: I

Fig. 5 is a fragmentary side elevation of one of the adjustable supporting members:

Fig. 6 is a view, partly in section, looking in the direction of arrow 6 of Fig. 5 2

Fig. 7 is a detail View of one of the adjust able-chucks and its supporting means:

Fig. 8' is a view similar to Fig. 1, being a section taken in the plane of line 8-8, of Fig. 9, showing a modified form of the invention: i

Fig. 9 is'a view looking in the direction of.

arrow 9 of Fig. 8:

Figs. 10, 11 and 12 are views of a portion of Fig. 9 with the parts in different positions when different widths of webs are used.

The invention is here shown clothed in the form it could take if embodied in a device similar to that shown in Letters Patent No. 1,124,673 of January 12, 1915, where a plurality of web rolls are mounted on a rotatable carrier so that when one roll is about to become exhausted, another roll may be moved into position whereby the paper supply may be replenished without necessarily stopping the machine but I wish it distinctly understood that this is but one of many forms that the invention might assume and that. so far as certain claims are concerned, the invention may be applied equally as well tola construction having but a single web r0 1.

l indicates a printing, or other web-pulling, machine of any suitable construction having a bed-plate 2. 9, 10 and 11 indicate a plurality of web rolls that are, in the present embodiment, successively brought into feeding position with respect to the printing machine being here carried by rotatable supporting means consisting of a shaft 4 mounted in pedestals 3 and two spiders or supporting members 5 and 6, each of which spiders has three arms there being provision at the end of each arm for holding a chuck 8; that is to say, the two supporting members carry a plurality of sets of opposed chucks, one chuck of each set being on one, and the other on the other, of the supporting members, said chucks being adapted to project into and engage the hollow core 7 of a web roll. Supporting members 5 and 6 are adjustable lengthwise of shaft 4 toward and away from each other but on account of a key connection are rotatable with the shaft in any adjustable position. The roll 9 is shown in feeding position and the web 14, being the feeding web passing to the printing ;.machine, is shown threaded through the parts. Shaft 4 carries a worm wheelf41 driven by worm 42 that may be tu'rnedby hand, or a motor, to bring succcssiveweb rolls into feeding position; and it will be understood that'if paste be applied to substitute or replenishing roll 10 and then, while the press is being run at slow j speed, the supporting means be rotated clockwise (in Fig. 1), roll 10 (being rotated slowly by hand) will come in contact with web 14 and 10 and 14 may then be pasted together. As soon as the two webs are joined, the web from roll 9 may be broken and roll 10 be moved into the position pre viously occupied by roll 9 and the exhausted core from roll 9"may be taken outand a fresh roll put in while in the position occupied by roll 11.

Suitable controlling mechanism, governed by the tension of the feeding web, and suita l e brake mechanism for the web rolls are provided. Preferably, the construction is such that the brake mechanism relating solely to the roll in feeding position is affected by the controlling means, and also, preferably, the parts are soarranged that the movement of a new roll intofeeding pos1- tion will not merely bring' the parts into such relation that the controlling mechanism and the brake mechanism may coact when coupled up, but the parts become automatically coupled or related so; that no additional work, such as latching two parts together, is necessary. Preferably, the controlling mechanism, mounted independently of the supporting means for the web rolls, consists of a controlling member and associated elements, and an actuating member centrally disposed with respect to the web rolls.

The brake mechanism as here constructed is as follows: One or both of the chucks of each set carries a brake wheel 12 V-shape against which are clampe the friction straps 13, with the, usual adjustment for compressing the straps around the brake pulley to produce more or less braking effeet. The tension straps 13, in addition to the usual hand screw adjustment, are mounted insuch manner that the ends of the straps opposite the hand wheel adjustment are also movable to increase or decrease the wrap of the brake shoes! by means of toggle 37 with the usual toggle connections. This to gle 37 has a brake rod 38 sliding through a liracket 39 and ending in anadjusting screw 40 which is in position to be acted on by cam 36 on sliding collar '35.

The controlling mechanism is here constructed as follows:

(Jam 36 and sliding collar 35 constitute an actuating member central with respect to the web rolls. The slidin collar is carried loosely on shaft 4, is ad ustable lengthwise thereof, and is prevented from rotating by means of pin 43 extendin into pedestal 3. Cam 36 is so sha ed as to be active with respect to the bra e rod of the web roll in feeding position.

Side register of the web can be obtained in the usual manner, either byshifting one of the pedestals 3 sidewise and with it the preferably I 1y disposed shaft 4 and all that it carries, or shaft 4 may be mounted to slide back and forth to side register the webs; or, if preferred, each web can be side registered individually by moving the paper-roll spindle sidewise, such as is usually done on floor fed newspaper presses and in common practice in the art. Web-14 runs to spring roller 15 which is of the ordinary construction and provides some yield to the variations in the Windin of the Various rolls of paper. From this ro ler, the web passes underneath the automatic tension-adjusting roll 16 and from there on to press roller 17 and thence into the press. Tension-adjusting roller 16 is carried by arms 18 on shaft 19 which is pivoted in the frame or bracket 20. On shaft 19 there is an extension rod 22 and balance weight 2? which balance weight ing closer to and farther from the shaft 19 and this counter-balances the weight of the roller 16 and arms 18. Carried also by shaft 19 is the lever 24 connecting with dash pot 25 which may be an air or oil checking device to steadythe travel of the web-tension roller 16 and to prevent violent and continuous vibration of the roller. There is also carried on shaft 19, adjusting lever 26 carrying a roll 27 that operates a crank lever 28. This crank lever is pivoted to frame 20 at point 29. The spring 30 is arranged to pull up one end ofcrank lever 28, while to the other end there is pivoted connecting rod 31 having a piston 43 sliding in cylinder 44 containing oil or other fluid; and from this cylinder extends a duct 45 that connects with a cylinder 46 in which latter is seated apiston 47 subjected to the pressure of a spring 48 on one side and to the pressure of fluid from duct 45 on its other side. .Piston 47 has arod 49 suitably connected to hell crank 32 which is forked at its lower end and terminates'in shoes 33 operating in groove 34 of sliding collar 35. It will be understood that in case it is desired to apply braking action on both ends of the roll, there may be another duct 45 leading to the other side of the machine and to a similar arran ement and fluid actuated means and slida le collar. Inasmuch as all the chucks are constructed alike, a description of one will suflice. Chuck 8 is carried by a short shaft 50 that extends through an opening 50" in an arm of a supporting member. This supporting member is also provided with a bracket 51 into which the short shaft 50 extends. Mounted in this bracket is a threaded member'52 that engages corrc- ..the brake mechanism will be retained. It

will be understood that if the chuck'is provided with a braking mechanism as described and suitable connections such as the slidable collar and cam 36 are provided at each side of the machine, the braking action may be applied to both ends of the web roll in response to variations in the tension of the web from the feeding roll. Instead of using a fluid pressure system, the form of the invention shown in Figs. 8 and 9 may be employed. As here indicated, arm 28 is attached to a transversely extend ng rod 55 from which extends at opposite ends thereof connections 56 attached to bell crank 57 which latter, in turn, is connected with bell crank 32 by means of arm 58.

In Figs. 10, 11 and 12 are shown different ways of adjusting the device when it is desired to use a web roll of less width than standard. For instance, in printing machines 1t is customary to use a four-pagewide web but it sometimes happens that it is desired to use only a two-page Wide web, or a three-page wide web, or a web of other smaller dimension. When it is desired to use a web of such smaller dimension, operating conditions may require that this web be run at one side of a machine, or at the other side, or in the middle, or at some other point.

In case it is desired to use a two-page wide web centrally of the machine, then the arrangement might be as shown in Fig. 10 Where supporting members 5 and 6 are .shown as having been adjusted toward each other to enable the chucks to be brought properly into engagement with the web rolls; and, in order to transmit the motion from the connections controlled by the tension of the web, member 35 may be retained nected with member 35 or with the bell in its position and another member 59 with a cam 60 similar to cam 36 may beconcrank operating that member by suitable means, such as rod 61, so that member 59. and cam 60 will receive exactly the same motion as that imparted to member 35.. In case it is desired to use a two-page wide web at one side of the machinefthen the arrangement in Fig. 11 may be resorted to. In this case, member 35 and cam 36 atone side of the machine are retained in their original position, as shown in Figs. 2 and 9; but, on. the other-side of the machine an auxiliary member 59 and auxiliary cam 60 may be employed and a long connecting member 62 is used to transmitthe motion. In case a three-page wide web is used at one side of the machine. then the arrangement shown in Fig. may be employed and this arrangement is substantially the same as that shown in Fig. 11 except that a shorter connecting member 63 is used at one side of the machine."

While the particular means for transmitting motion from the web tension roller to.

It is important that braking pressure he applied substantially equally at opposite ends of the roll. In the form of the invention shown in Figs. 1 and 2 it will be seen that the fluid pressure sends equal impulses in both directions through ducts 45 and 45 while in Figs. 8 and 9 equalizing bar 55 serves to transmit an equal movement to both of the connections 56.

I claim:

1. Tension device for web rolls including: means for bringing web rolls having hollow cores, one at a time into feeding position, a plurality of sets of chucks carried by said means to enter the hollow cores of the web rolls, controlling mechanism governed by the tension of the web from the roll in feeding position, and a plurality of brake mechanisms one for a chuck of each roll movable with said means to co-act with said controlling mechanism as each roll comes into feeding position.

2. Tension device for Web rolls including: means for bringing web rolls, having hollow cores, one at a time into feeding position, a plurality of sets' of chucks carried by said means to enter the hollow cores of the web rolls, controlling mechanism governed by the tension of the web from the roll in feeding position, and a plurality'of brake mechanisms one for the chucks of each roll movable with said means to co-act with said controlling mechanism as each roll comes into feedin position. i

3. ension device for web rolls including:

means for bringing web rolls, having hollow Union and State of New Jersey, this 24th day of July, 1925.

. DAVID Jjsoo'rr.

Images