US1940852A

US1940852A - Web controlling mechanism

Info

Publication number: US1940852A
Application number: US572026A
Authority: US
Inventors: Fankboner Harland
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-10-30
Filing date: 1931-10-30
Publication date: 1933-12-26
Anticipated expiration: 1950-12-26

Description

Dec. 26, 1933.

H. FANKBONER WEB coNTRoLLNG MECHANISM 2 sheets-sheet 1 Filed oct. so. 1931 mnnnnunnl-Mnr! NVENTOR Dec. 26, 19.33.

. H. FANKBNER WEB CONTROLLING MECHANISM Filed Oct. 50, 1931 \2 Sheets-Sheet 2 :j ATTORQY which the straps engaging Patented Dec. 26, 1933 UNITED STA Application October 30,

The present invention ling means and more particularly to improved web tensioning mechanism high speed rotary printing presses.

1,940,852 WEB CONTROLLING MECHANISM Harland Fankboner, Chicago, Ill.

1931. serial No. 572,026

'l Claims. (Cl. 2424-75) relates to web controla novel and for use with Objects and advantages of the invention will be set forth in part hereinafter and be obvious herefrom, or may tice with the invention, and attained by means of and combinations pointed out in the claims.

in part will be learned by practhe same being realized the instrumentalities appended The invention consists in the novel parts, constructions,

arrangements, combinations and improvements herein shown and described.

The accompanying drawings, referred to herein and constituting a part hereof, illustrate one embodiment of the invention, the description, serve to the invention.

Of the drawings:-

Figure 1 is a side elevation of a and together with explain the principles of mechanism constituting the present preferred and illustrative embodiment of the invention; and

Figure 2 is a vertical section taken 2-2 of Figure 1.

on the line The present invention has for its object the provision of a web tensioning mechanism which will operate satisfactorily with uneven or out-ofround web rolls.

Another object is the provision of a web tensioning mechanism employing a plurality of friction members in engagement with the periphery of the web roll, and having means for maintaining equal the pressure between'the friction members and the web roll. Still another object is the provision of a tension mechanism in the periphery of the web roll are so interconnected that movement of any one strap is transmitted to equalize the pressure of all the straps roll.

Referring now in the others to against the detail to the present preferred and illustrative embodiment of the invention, the web rollI 1,

from which the web 2 is fed to the printing press, is rotatably supported by means of web roll shaft 3 journalled in suitable bearings 4 formed in web roll supporting brackets 5 at either side of the web roll.

be conveniently formed Brackets 5 may as an integral part of the side frames-6 of the printing press, although any other desired or suitable form of web roll supporting means may be employed.

For tensioning the web, there are provided a plurality of friction members yieldingly pressed into engagement with the periphery roll across its width, said friction me of the web mbers serving Ato restrain the rotation of the web roll. As

embodied, these friction members comprise flexible straps 7, attached rollers 8 slidably keyed lower ends are attached in a manner later `to be at their upper ends to to a shaft 9, while their 6o described. Means are provided for pressing the straps .against the surface of the web roll with a substantially uniform,

but variable, pressure, and

for taking up slack in the straps as the web roll wears down; For this rotatably journalled in 10, rigidly attached to a side frames 6. At one purpose, the shaft 9 is the lower ends of arms shaft 1l journalled in the end shaft 11 is provided with a laterally projecting threaded arm 12 on which is mounted a correspondingly threaded 7 weight 13, tending to shaft l1.

rotate the arms At one end, shaft 9 is provided with a 10 and their pinion 14 meshing with a segmental rack 15 fixed to the inner side of one side frame 6, so that movement of arms 10 by weight 13 rotates the shaft 9 and rollers 8 to take up the slack in the straps and maintain them in contact with the surface of the web roll. the web may be varied The normal tension of by movement of weightv 13 on threaded arm 12, and as Weight 13 is moved outwardly, the pressure between the belts '7 and the web roll is increased, thereby increasing the tension on the we `Means are provided for rendering the pressure of all the straps against times,` thereby preventing the web roll equal at all the exertion of excessive pressure between any belt and the web roll due to unevenness in pose, the lower end of each strap is provided .a pulley l'lv attached thereto. Below the web the rolls. For this .pur-

and extending substantially parallel to its axis,

is a transverse rod 18, side frames 6, with collars 19 and 20.

and provided rigidly supported in the along its length Collars 20,` near the ends of the roll, are provided with eyes 21 and freely 95 rotatable guiding pulley s 22 while the inner collars 19 are provided with pairs of spaced pulleys 22.-A A flexible cable 23 to eyes 21, at either en looped over pulleys leys 22.

As collars 20 rod 18 and rollers 8 with respect to the web,

tioned as desired across roll. 'When properly p is attached at its ends d of the web roll and is 17 between the guiding pul- 190 are slidable along the supporting are movable transversely the strap 7 may be posi:-

the width of the web ositioned collars 20 are rmly secured in position by set screws 24.

In operation, the straps '7 are normally pressed into engagement with the surface of the web roll,

and maintained in eng agement therewith with an uneven or out-of-round web roll is mounted inweb feeding position, the high parts of the web lroll tend to increase the tension on one or more of the straps, as the high part of the roll moves the straps out of their normal position. Any movement of one strap causes the corresponding loop in cable 23 to be enlarged shortening the remaining loops and thereby reducing the pressure between the rst strap and the roll and transmitting a portion of this pressure to the remaining straps. This action prevents the building up of excessive pressure between any one strap and the web roll distributing the additional pressure over all of the straps so that only a rslight and unobjectionable increasein pressure is created, preventing an abnormal and excessive increase in the tension of the web. Similarly, in case one of the straps stretches to a greater extent than the remainder the pressure of all remains equal and no individual adjustment of the straps is necessary as their pressure is always equalized.

The invention in its broader aspects is not limited to the speciiic mechanisms shown and described but departures may be made therefrom within the scope of the accompanying claims without departing from the principles of the invention and without sacrificing its Achief advantages.

What I claim is:

l. Web controlling mechanism including in combination means for rotatably supporting a web roll, a plurality of friction straps pressed into engagement with the periphery of the web roll to tension the web drawn therefrom and means interconnecting said straps for equalizing their pressure against the roll.

2. Web controlling mechanism including in combination means for rotatably supporting a web roll, a plurality of friction straps engaging the periphery of the web roll, means for pressing the straps against the web roll with a uniform tension as the web roll wears down, and interconnecting means between the straps and a stationary support for equalizing the pressure between them.

3. Web controlling mechanism including in combination means for rotatably supporting a web roll, a plurality of friction members yieldingly pressed into engagement with the periphery of the web roll and means interconnecting said members for equalizing their pressure against the roll.

4. Web controlling mechanism including in combination means for rotatably supporting a web roll, a plurality of friction straps pressed into engagement with the periphery of the web roll to tension the web drawn therefrom, a common support to which the straps are attached at one end, a transverse member extending across the width of the web roll, a cable attached to the member to provide loops adjacent the other end of each strap and means for movably connecting each strap to its corresponding loop.

5. Web controlling mechanism including in combination means for rotatably supporting a web roll, a plurality of friction straps pressed into engagement with the periphery of the web roll to tension the web drawn therefrom, a common support to which the straps are attached at one end, a transverse member extending across the Width ofthe web roll, a cable having both its ends attached to said member, guides on said member between each pair of straps, and means for movably attaching the other end of each strap to the cable between the guides.

6. Web controlling mechanism including in combination means for rotatably supporting a Web roll, a plurality of friction straps pressed into engagement with the periphery of the web roll to Vtension the web drawn therefrom, a common support to which the straps are attached at one end, a transverse member extending across the width of the web roll, a cable having both its ends attached to said member, guides on said member between each pair of straps, pulleys on the other end of each strap around which the cable is passed between said guides.

7. Web controlling mechanism including in combination means for rotatably supporting a web roll, a plurality of friction straps pressed into engagement with the periphery of the web roll to tension the web drawn therefrom, a common support to which the straps are attached at one end, a transverse member extending across the Width of the web roll, a cable having both its ends attached to said members, guide pulleys on said member between each pair of straps, a pulley on the other end of each strap and around which the cable is passed between its adjacent guides.

HARLAND FANKBONER.