|Publication number||US1995722 A|
|Publication date||Mar 26, 1935|
|Filing date||Sep 23, 1931|
|Priority date||Sep 23, 1931|
|Publication number||US 1995722 A, US 1995722A, US-A-1995722, US1995722 A, US1995722A|
|Inventors||James Smith Ernest|
|Original Assignee||Goss Printing Press Co Ltd|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (13), Classifications (8)|
|External Links: USPTO, USPTO Assignment, Espacenet|
March 26, 1935. 1 E. .1. SMITH WEB CONTROLLING MECHANISM Filed Sept. 23, 1931 ATTORNEY Patented Mar. 26, 1935 WEB CONTROLLING MECHANISM Ernest James Smith, Fleet; Street, England, as-
Chicago, 111., a corporation of Illinois signer to The Goss Printing Press Company,
A pl cation September 23, 193;, Serial No. 564,597
The present invention relates to web controlling mechanism and more particularly to a new and improved web controlling mechanism for controlling the rotation of web rolls and the tension of paper webs fed to a high speed rotary printing press.
Objects and advantages of the invention will be set forth in part hereinafter and in part will be obvious herefrom, or may be learned by practice with the invention, the same being realized and attained by means of the instrumentalities and combinations pointed out in-the appended claims.
The invention consists in the novel parts, constructions, arrangements, combinations and improvements herein shown and described.
The accompanying drawing, referred toherein and constituting a part hereof, illustrates one embodiment of the invention, and together with the description, serve to explain the principles of the invention. i Of the drawing:-- I
Fig. 1' is a diagrammatic side elevation of j the present preferred and illustrative embodiment of the invention; and
Fig. 2 is a fragmentarydetail, partly in section, ofthe pilot roller and brake -controlling mechanism used in connection with the present embodiment.
The present invention has for its object the provision of a web controlling mechanism which is particularly adapted for use with printing presses running at extremely high speeds. A further object is the provision of a web controlling mechanism in which means are provided for tensioning the web fed to a web consuming machine and for stopping rotation of the web roll when the press is shut down or the web breaks. A fur-' ther object is the provision of a web tensioning mechanism acting on the surface of the web roll in combination with a web roll controlling mechanism acting on the central portion of the web roll. Still another object is the provision of a simple, easily controlled and relatively inexpensive mechanism by which the tension of the web and the rotation ofthe web roll may be controlled in accordance with press operating conditions. I
Mechanisms have heretofore been provided for tensioning the web led to a printing press by contact with the surface ofthe web roll, but when the web is drawn from the web rollat extremely high speeds, the friction belts or straps cannot be easily pressed against the surface of the roll with suflicient force to stop the rotation of the '1 Claims. (01. 242-15) web roll as quickly as the outer layers of paper on the roll are stopped. In the operation of such mechanism at high speeds it is often found that many of the outer layers of paper will be loose on the roll after a sudden stopping of the web roll,
due to inner portions of the roll continuing to unwind within the outer layers of the roll. This loosening of the outer layers complicates the starting of the press, and at times causes breaking of the web.
In accordance with the present invention, the major portion or all of the web tension on the running web is produced by frictional contact of a friction member against the surface of the web roll, and when the press is stopped or the web breaks, the stopping of the web roll is effected by braking mechanism operating on the central part of the web roll; as for instance on the web'roll end or core. The friction member for creating the web tension may be of any desired form, such as a stationary or running belt or strap preferably. exerting a substantially con- Referring now in detail to the present pre- I ferred and illustrative embodiment of the present invention for use 'with a plurality of web rolls, a plurality of web rolls 10 are rotatably supported in a magazine reel so that the active web of paper 11 may be led from one of the web rolls to the web consuming machine or printing press. As is usual in this type of mechanism, the running web is led from only one of the rails. 10 and as this roll becomes exhausted, a new web roll is moved into position by rotation of the magazine reel and the web lead is automatically or otherwise transferred from the expiring web roll to the next or reserve web roll, after which the exhausted web roll may be'replaced.
The magazine reel comprises apair of plural armed supports 12 rotatably mounted on side frames 14 by means of shaft 15, said supports being spaced apart to receive web rolls-10 .between them and being provided at the outer ends of their arms with chucks or shafts 16, by which the web rolls are rotatably supported. Suitable means, not shown, may be provided for rotating into web feeding position as required, and for holding the arms in the desired position during the normal operation of the mechanism.
For tensioning the web as it is fed from the rotating web roll to the printing press, a friction member is provided, engaging the surface of the web roll and pressed into contact therewith with suflicient pressure to create the required or desired web tension. While this tensioning mechanism may be of widely diflerent forms, I preferably. employ a plurality of relatively stationary straps or aprons held in contact with the surface of the web roll with a substantially constant pressure. As embodied, there are provided a plurality of straps l7 supportedat their upper ends above the running web roll on a shaft 18 and arranged side by side across the width of the web roll. These straps hang dovmwerdly, pass over idle pulleys 19, and at their lower ends are fastened to weights 20, one set 01' weights being provided for each strap, thereby permitting the straps to move independently of each other to conform to irregularities in the shape of the surface of the web roll. Shaft 18 and pulleys 19 are preferably arranged substantially in a line with the axis of the web roll in running position and weights 20 serve to maintain them in contact with the web roll surface as it decreases in size.
To enable the operator to vary the tension on the web as required, the weights are preferably easily removed from their hanger 21 at the end of the strap, and weights may be added or removed to give the required pressure between the belts and the web roll surface.
In the present embodiment, the braking mechanism operating on the web roll, as distinguished from the periphery of the web roll, comprises electromagnetic brakes which are adapted to be variably energized in accordance with varying operating conditions and are applied with force sufiicient to stop the rotation of the web roll when the press is stopped or the web of paper breaks. As'embodied, each brake comprises a pair of brake shoes 24 pivoted at 25 on the outer end of an arm'12 and coacting with a brake drum or pulley 26 fixed to the web roll shaft or chuck 16. At their inner ends, the brake shoes are provided with armatures 27 which extend inwardly towards each other and into a solenoid 28.
Brake shoes 24 are normally'held apart from each other, and are applied by energizing the solenoid 28, and, as embodied, the lower brake shoe is held out of contact with the brake pulley by gravity when the corresponding web roll is in running position, while the upper brake shoe is raised out of contact with the brake pulley by means of compression spring 29, encircling the upper armature 27 and positioned between the upper shoe and the solenoid 28. This spacing of the brake shoes'permits the brakes to be entirely released when no current is passing through the solenoid.
Means are providedfor selectively'connecting the brake for the running web roll with brake controlling mechanism, and as embodied, a pair of commutator rings are mounted on one of the side frames and concentric with the magazine reel shaft 15. These rings are each divided into a plurality of segments 30, corresponding in number to the number of web rolls supported in the reel and each segment is secured to an insulating support 31 and are insulated from each other.
Segments are connected with their corresponding solenoids 28 and are positioned on the reel to contact with brushes 32 so that as each new web roll is brought into web feeding position, the corresponding brake for the web roll is rendered operative.
Preferably, the belts or straps contacting with the surface of the web roll exert a substantially constant pressure against the web to create a normal tension slightly less than that required in the operation of the press, and the difference between the tension set up by the straps and the required tension is created by a light application of the brakes. If desired, however, the straps may set up the entire normal tension required, and the brakes'may be employed solely for the purpose of stopping the rotation of the web roll.
For controlling the application of the brakes, a pilot roller is provided and moves with changes in web tension to vary the force with which the brakes are applied. Pilot roller 36 is rotatably mounted in pivoted arms 37 carried by shaft 33 and is moved against the tension of the web by means of spring 39 coiled about shaft 38. One end of spring 39 is held rigid with respect to the shaft 38, while the other end is'fastened to a sleeve 40, loosely mounted on shaft 38, this sleeve being rotatable and held in any desired position by means of worm 41 meshing with segment 42. The web 10 in passing to the press is looped around the pilot roller 36, and an increase in web tension moves the pilot roller in one direction, while a reduction in the web tension causes the pilot roller to move in the other direction.
At one end, pilot roller shaft 38 is fastened to a rheostat arm 43 which contacts with and is movable over a resistance 44, in series with the operative web roll brake. Resistance 44 is connected at one end to the source of power and the rheostat arm 43 is connected with one of the brushes 32. As the tension of the web increases, additional resistance is placed in circuit decreasing the braking applied to the web roll and reducing the tension, while a decrease in the web tension cuts-out a portion of the resistance to increase the braking on the web roll. Breakage of the web causes the pilot roller to move to cutout all the resistance applying the brakes with full force and quickly stopping the roll.
By varying the tension on the pilot roller spring 38, any desired tension may be maintained, and by varying the weights 20 connected to the straps l7 and raising the tension of the pilot roller spring, the entire required web tension may be set up by the straps, reserving the brakes for the stopping of the roll.
The invention in its broader aspects is not limited to the specific 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 chief advantages.
1. Web roll controlling mechanism including in combination means for rotatably supporting a plurality of web rolls, means for moving said' supporting means" to bring the web rolls successively into feeding position, a friction member engaging the surface of the web roll and movable relatively to the web roll support to tension the web drawn from the active roll, and electromagnetic brakes, one for each web roll, a pilot roller controlled rheostat in circuit with said brakes and means for selectively rendering the active web roll brake operative.
2. Web roll controlling mechanism including in combination means for rotatably supporting a plurality of web rolls, means for moving said supporting means to bring successive web rolls into feeding position, a pilot roller moved by changes in web tension, an electro-magnetic brake for each web roll acting on the web roll shaft, means for variably energizing said brakes under control of the pilot roller, and means for selectively connecting the brake for the roll in feeding position with the pilot roller control.
3. Web roll controlling mechanism including in combination means for rotatably supporting a plurality of web rolls, means for moving said supporting means to bring successive web rollsinto feeding position, a pilot roller moved by changes in web tension, an electro-magnetic brake for each web roll acting on the web roll shafts, means for supplying energizing current to each of the brakes,'means controlled bythe pilot roller for varying said current, and means for selectively connecting the brake for the roll in feeding position with the current varying means.
4. Web roll controlling mechanism including in combination means for rotatably supporting a plurality of web rolls, means for moving said supporting means to bring successive webrolls into feeding position, a pilot roller moved by changes in web tension, an electro-magnetic brake for each web roll acting on the axial portion of the web roll, a rheostat controlled by said pilot roller and means for connecting said rheostat in series with the brake for the roll in feeding position by movement of a roll to feeding position.
5. Web roll controlling mechanism including in combination a rotatable support for rotatably &
supporting a plurality oi web rolls, means for moving said supporting means to bring successive web rolls into feeding position, a pilot roller moved by changes in web tension, an electro-magnetic brake for each web roll acting on the web roll shaft, means for variably energizing said brakes under control of the pilot roller, and means for selectively connecting the brake for the roll in feeding position with the pilot roller control.
6. Web roll controlling mechanism including in combination a rotatable support for rotatably supporting a plurality of web rolls, means for moving said supp rting means to bring successive web rolls into feeding position, a pilot roller moved by changes in web tension, an electro-magnetic brake for each web roll acting on the axial portion of the web roll, a rlieostat controlled by said pilot roller and means for connecting said rheostat in series with the brake tor the roll in feeding position by movement of a roll to feeding position.
'7. Web roll controlling mechanism including in combination means for rotatably supporting a plurality of web rolls, means for moving said supporting means to bring successive web rolls into feeding position, a pilot roller moved by changes in web tension, an electro-magnetic brake foreach web roll acting on the web roll shafts, means for supplying energizing current to each of the brakes, means controlled by the pilot roller for varying said current, and automatic means for selectively connecting the brake for the roll in feeding position with the current varying means by movement of a web roll to feeding position. 1
EFL-NEST JAMES; Sll/ETH.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US2502688 *||Nov 22, 1944||Apr 4, 1950||Hoe & Co R||Web supplying mechanism for printing machines|
|US2622824 *||Jun 17, 1948||Dec 23, 1952||Dominic Perinoni||Fishing reel|
|US2865576 *||May 9, 1956||Dec 23, 1958||Western Electric Co||Reel stand|
|US2914268 *||Jun 7, 1955||Nov 24, 1959||Frank E Smith||Camera magazine brake control and film failure mechanism|
|US2946536 *||Dec 6, 1956||Jul 26, 1960||Torrington Mfg Co||Pay off reel for wire or the like|
|US3015453 *||Apr 29, 1959||Jan 2, 1962||Ibm||Web feeding and winding device|
|US3089665 *||Nov 9, 1960||May 14, 1963||Western Electric Co||Tension equalizer|
|US3918655 *||Nov 8, 1973||Nov 11, 1975||Champion Edison Inc||Web-splicing apparatus|
|US3981459 *||Apr 24, 1975||Sep 21, 1976||Xerox Corporation||Photoelectrophoretic electrostatic tacking capstan web tension system|
|US4903909 *||Mar 21, 1989||Feb 27, 1990||Kabushiki Kaisha Tokyo Kikai Seisakusho||Brake for paper roll bearing shaft in paper roll support frame of web feeder for rotary press|
|DE1133736B *||Apr 21, 1956||Jul 26, 1962||Miehle Goss Dexter Inc||Einrichtung an Rotationsdruckmaschinen zum selbsttaetigen Ankleben einer von einer Rolle ablaufenden Papierbahn an eine Ersatzrolle|
|DE1134089B *||Dec 10, 1959||Aug 2, 1962||Koenig & Bauer Schnellpressfab||Papierrollenwechselvorrichtung, insbesondere fuer Rotationsdruckmaschinen|
|DE1265524B *||Jan 5, 1960||Apr 4, 1968||Wood Newspaper Mach Corp||Vorrichtung zum Abtrennen einer laufenden Bahn in einer Einrichtung zum Ankleben derBahn an eine auf eine Vorratsrolle aufgewickelte Bahn|
|U.S. Classification||242/421.7, 242/554.3, 242/422.7, 242/422.3, 242/422.9|