US1735570A

US1735570A - Tension device for web rolls

Info

Publication number: US1735570A
Application number: US249470A
Authority: US
Inventors: Margaret A Halliwell
Original assignee: R Hoe and Co Inc
Current assignee: R Hoe and Co Inc
Priority date: 1928-01-25
Filing date: 1928-01-25
Publication date: 1929-11-12
Anticipated expiration: 1946-11-12

Description

Nov. 12, 1929. J, J, HALUWELL 1,735,570

TENSION DEVICE FOR WEB ROLLS Filed Jan. 25. 1928 2 Sheets-Sheet l Patented Nov. 12, 1929 UNITE STATS PATENT OFFICE JOHN J. HALLIWELL, DECEASED, LATE OF 'I'UCKAHOE, NEW YORK, BY MARGARET A. HALLIWELL, EXECUTRIX,' OF TUCKAHOE, NEW YORK, ASSIGNOR TO R. HOE & 00., INC., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK TENSION DEVICE Application filed January 25,

This invention relates to certain improvements in web roll controlling mechanism.

In certain types of web roll controlling, mechanism for controlling the unwinding of web rolls running to printing machines the roll in use is controlled by friction devices usually in the form of narrow belts or straps which engage the roll surface and which are controlled by means causing them to exert a tension or pressure against the roll surface. In the operation of these mechanisms it is desirable that the tension of the straps or other devices be relieved or released so that a new web roll may be loaded into the support. It is further desirable, however, that while the machine is in operation that the tension devices'may act independently against the web roll;

It is the especial object of the present invention to produce a construction by which the tension devices may be simultaneously operated to relieve pressure, and at the same, time operate independently to produce the required tension on the web roll.

It is a further object of the invention to produce a simple mechanism for effecting the desired results, and one which can be readily installed in the machine with which it is used.

\Vith these and other objects not specifically referred to the invention consists in certain novel parts, arrangements and combinations which will be fully described in connection with the accompanying drawings and the novel features pointed out in the claims hereunto appended.

In the drawings Figure 1 is a side elevation of the webfeeding end of a press, with a full web roll in position, and a running web roll feeding to the press;

Figure 2 is a plan view partly in section of the construction shown in Fig. 1, the view being taken on line A-A of that figure in the direction of arrow 2;

Figure 3 is a vertical sectional view, partly' broken away taken on the line 33 of Fig. 1 in the direction of the arrow 3; and

Figure 4 is a detail of one form of clutch mechanism which ma be employed.

Referring now to t ese drawings the ma- FOR WEB ROLLS 1928. Serial No. 249,470.

chine chosen" to illustrate the invention includes a support capacitated to support a runnmg web'roll and a spare web roll mounted in fixed bearings, but it will be understood that the invention is adapted for use in other relations, as for instance a construction in which the web roll or rolls'are mounted in a rotary or swinging support. In the mechanism shown, however, there is provided suitable side framing 1, 2 to which are secured oppositely disposed

bracket arms

3, 4, 5, 6 in which are bearings 7 for supporting a running web roll R and a spare roll S.

Forcontrol'ling the unwinding of the running web roll there is provided a plurality of tension or friction devices, which may vary somewhat in construction, but which are shown in the form of narrowbelts o-r straps,

two such straps being provided for each roll position, the roll running to the press and 10 for the, straps engaging the new roll S. The straps are anchored'or fastened at one end at a point below the web rolls and are located on the inside of the rolls so that the rolls unwind 7 against the tension or pressure of the straps. As shown, the straps 8 are secured to a cross bar 11 supported in brackets 12 suitably secured to the side frames of the machine and the straps 10 are anchored to a cross bar 13 mounted in brackets 14 secured to the-side frames of'the machine opposite the brackets 12. The straps 8, 9, engage the running roll R and pass over sheaves 15 on a cross bar 16 suitably mounted in the brackets 5', 6 similar to brackets 5, 6 before referred to. The free ends of these straps are secured as by splicing to

chains

17, 18 which pass around sprockets 19, 20 on an operating shaft 21 suitably journaled in the side frames 1, 2 before referred to. The ends of these chains are connected with devices by which tension is exerted on the straps, which devices in the particular construction illustrated are in the form of adjustable weights 22.

' Similarly, the straps 10 for the roll S pass over sheaves 23 24 on a cross rod 25 suitably supported in the brackets 3, 4. similar to of these straps are secured as these straps being marked 8, 9 for 7 on to the support.

chains 26, 27 which pass over

sprockets

28, 29 on an operating shaft 30 suitably journaled in the side frames 1, 2, before referred to. The

ends of these chains are also equipped with devices for exerting tension on the straps, such devices being shown in the form of adjustable weights 31.

In the best constructions, for'convenience the two operating shafts 21 and 30 are located closely adjacent and the sprockets are therefore preferably arranged in a staggered relation as shown in Figure 2.

In the operation of the tension straps these straps follow the roll as the roll decreases in size, the weights dropping and obtaining the desired tension or pressure on the straps. As the tension of one strap on the roll in use may vary with respect to the tension exerted by the other strap, it is desirable that the straps may act independently. When, however, it is desired to load a fresh web roll into the support the straps must be manipulated so that the tension exerted by them is relieved, this being effected in the particular machine illustrated, by raising the weights in order to effect such operation, and it is desirable that the weights controlling the straps for one of the rolls be manipulated or raised simultaneously. The present invention provides a simple and eflicient means for effecting this simultaneous manipulation of the weights and at the same time permits the weights to act independently of each other.

While the specific means provided for effecting this may vary somewhat in construction, in the particular arrangement shown each of the sprockets is provided with a clutch by which the sprockets may be simultaneously turned with the shaft in one direction but which will permit the sprockets to turn independently of the shaft in the other di rection. The clutch construction employed mayvary widely in form. A simple and efficient one is that shown in which there is provided a clutch of the roller type marked 32, shown in Figure 4, this clutchacting to clutch the sprockets to the shaft when rotated in a counter-clockwise direction but permit the sprockets to run freely on the shaft in a clockwise direction. The shaft is conveniently turned in a counter-clockwise direction to raise the weights by means of a hand crank 33 which fits over a squared end 34 on one end of the shaft. Figure 1 shows theweights 31 for the belts 10 being lifted by the rotation of the shaft 30 in a counterclockwise direction and the new roll S loaded In the best constructions means are provided for holding the weights in raised position while the roll is being loaded in place in the support. A convenient means is that illustrated which includes a double nosed pawl 35 which engages the

ratchets

36, 37 fast on the shaft. When the crank and the pawl are released the weights drop and put tension on the straps and each of the weights may operate independently of the other. The webs may be led from the running roll to the press in any suitable manner. As shown the web R passes over guide rolls 37, .38 around a spring-seated tension roll 39 and a guide roll 40 to the press. When this rollR becomes exhausted its web is severed from the core, passed over the new roll S on the opposite side of the support, pasted to the end of the new roll which is then fed over a guide roll 41 and the roll 38 tothe press over the tension roll 39 and guide roll 40.

While the invention has been shown and described in its preferred form it will be understood that certain changes and variations may be made in the form and arrangement of the parts without departing from the 1nvention as defined in the appended claims.

What is claimed is:

1. In a web roll controlling mechanism the combination of means for supporting a web roll, a plurality of friction devices engaging the surface of the web roll, means for simultaneously manipulating the friction devices torelieve the pressure exerted thereby, and means for permitting the tension devices to act independently of each other in exert ing pressure against the roll.

2. In a web roll controlling mechanism the combination of means for supporting a web roll, a plurality of friction straps or belts engaging the surface of the roll, means for producing tension on the straps to which the ends of the straps are secured, means for s1- multaneously manipulating the tension producing means to relieve the pressure exerted by the straps, and means whereby the tension producing devices may act independently of each other.

3. In a web roll controlling mechanism the combination of means for supporting a web roll, a plurality of friction straps or belts secured at one end and engaging the surface of the roll, weights attached to the free ends of the straps, an operating shaft, sprockets on the shaft over which the belts pass and means for connecting the sprockets to the shaft so that they turn therewith in one direction of rotation, but are free to rotate thereon independently'in the other direction.

4;. In a web roll controlling mechanism the combination of means for supporting a web roll, a plurality of friction straps or belts secured at one end and engaging the surface of the roll, weights attached to the free ends of the straps, an operating shaft, sprockets on 5. In a web roll controlling mechanism the combination of means for supporting a web roll, a plurality of friction straps or belts secured at one end and engaging the surface 5 of the roll, weights attached to the free ends of the roll, an operating shaft, sprockets over which the belts pass, a clutch for clutching the sprockets to the shaft when the shaft is turned in one direction to simultaneously raise the weights, but permitting free rotation of the sockets in the other direction, and means for holding the weights in raised position. I 6. In a web roll controlling mechanism the combination of means for supporting a running web roll and a spare web roll, a plurality of friction straps or belts engaging the surface of each roll and secured at one end, weights secured to the free ends of the straps, operating shafts arranged closely adjacent, sprockets on each shaft over which straps pass, means for operating each shaft to simultaneously raise the weights associated therewith, and means common to both shafts for holding the weights in raised position. 5 In witness whereof'I have hereunto signed my name.

MARGARET A. HALLIWELL, Exec atria: of the Estate of J 07m J. H aZZiweZl,

Deceased.