US2955732A

US2955732A - Air pressure means for urging paper web against a rotating cylinder

Info

Publication number: US2955732A
Application number: US820502A
Authority: US
Inventors: Anton R Stobb
Original assignee: Individual
Current assignee: Individual
Priority date: 1957-12-16
Filing date: 1959-06-15
Publication date: 1960-10-11
Anticipated expiration: 1977-10-11

Description

Oct. 11, 1960 A. R. STQBB AIR PRESSURE MEANS FOR URGING PAPER WEB AGAINST A ROTATING CYLINDER Original Filed Dec. 16. 1957 mum/roe- ANTON R. STOBB BKMW United States Patent AIR PRESSURE MEANS FOR URGING PAPER WEB AGAINST A ROTATING CYLINDER Anton R. Stabb, 3507 S. Elmwood Drive, Racine, Wis.

Original application Dec. 16, 1957, Ser. 'No. 703,028. Divided and this applicationJune 15, 1959 Ser. No. 820,502

5 Claims. Cl. 226-95 This is a division of US. application Serial No. 703,028,

filed December 16, 1957, and now Patent No. 2,899,199. In the parent application, it is stated that it is desirable to maintain a selected tension on a web of paper passing through a press. With tension control, superimposed colors of multi-color printing are accurately registered. However, in using a roll drive for the web, the web is trained over a cylinder which moves the web upon rotation of the cylinder and when the web is pressed against the cylinder. To physically contact the web, as with another roller, could smear the fresh ink on the web.

Accordingly, it is an object of this invention to provide an air-pressure means for controlling a web of paper on a rotating cylinder so that the fresh ink on the paper, and the paper itself, are not physically, on the outer surface thereof, contacted.

Still another object of this invention is to provide an air-pressure hold-down means which speeds the drying of the ink on the printed web.

Still a further object is to provide an air-pressure holddown means which is automatically responsive to the pressure, and which is adjustable for providing selected pressures.

Other objects and advantages will become apparent upon reading the following specification in conjunction with the accompanying drawings, wherein:

Fig. 1 is a fragmentary view of the inventive means for maintaining a web of paper in tight contact with a roll over which the paper is trained.

Fig. 2 is a sectional view taken on the line 5-5 of Fig. 1.

Fig. 3 is an enlarged sectional view taken on the line 6--6 of Fig. l and showing a fragment of the latter.

Figs. 1, 2 and 3 show the inventive means of holding the web of paper to the roller 12 so that the web can be properly tensioned as desired. In this arrangement, it will be seen that the roller 12 has an air chamber 56 disposed along the length of the roller and partially around the circumference of the roller to be in close proximity to the roller at a point where the web of paper is also wrapped around the circumference of the roller 12. When air is introduced into the chamber 56 by means of a pipe or hose 57, the interior of the chamber 56 is pressurized such that the air pressure is exposed to the paper 11 to press the latter in firm contact with the cylinder 12 so that the friction between the paper and the cylinder is at a desired amount so that the paper will always be in rolling contact with the cylinder even though the paper will be placed under tension as mentioned. In order that the air pressure within the chamber 56 be fully or virtually fully eflective on the paper 11, it is shown that there be provided pressure bars 58 along the length of the chamber 56 and throughout the width of the paper 11. lhe bars 58 are shown to be urged downwardly toward the ICC paper by means of a compression spring 59 which is contnolled in its tension by a pressure bar 61 and a screw 62 threaded into the vessel 56 by the nut 63 shown in the top of the vessel 56. Also, a retained bolt 64 is shown to pro-. ject through the side of the vessel 56 and engage a slot 66 in the side of the pressure bar and thereby retain the latter within the cut-out 67 in the vessel 56. Thus, by adjusting'the screw 62, the spring 59 will exert more or less force, downwardly on the pressure bar 58 to urge the latter toward the paper 11. Then, when air is introduced into the vessel 56, its outlet-is under the pressure bars 58 which are thus slightly lifted by the escaping pressurized air, and the balance between the energy of the spring 59 and the escaping air will determine the spacing of the tips 68 of the pressure bars 58 from the surface of the paper 11. Of course, it is sometimes preferred that the pressure bar tips 68 be spaced from the paper so that there is no contact'of the paper which might have been just printed. Also, to close off the ends of the vessel 56, end closures 69 are attached to the vessel to extend therefrom and down into contact with the circumference of the roller 12.

It should thus be understood that compressed air can then be disposed immediately over the surface of the paper 11 as the latter travels in rolling contact with the roller 12, and the pressure of the air will hold the paper in exact rolling contact with the roller 12 as desired. Of course, the vessel 56 and its related parts are then substituted for the member 22 which also serves the function of holding the paper to the roller 12.

While a specific embodiment of this invention has been shown and described, it should be obvious that certain changes could be made therein, and the scope of this invention should, therefore, be limited only by the appended claims.

What is claimed is:

l. A means for controlling a web of paper, comprising a rotatable cylinder for supporting said web of paper when the latter is wrapped partly over the circumference of said cylinder, a compressed air chamber mounted adjacent the circumference of said cylinder and having an opening exposed to said circumference, and air sealing means movably mounted on said chamber at the edge of said opening for movement toward and away from said circumference to be spaced selectable distances therefrom and from said web of paper to cause compressed air in said chamber to force said paper onto said circumference, said air sealing means being exposed to said compressed air for urging said air sealing means away from said paper.

2. A means for controlling a web of paper, comprising a rotatably mounted cylinder for supporting said web of paper when the latter is wrapped partly over the circumference of said cylinder and with the lateral edges of said web of paper spaced inwardly from the ends of said cylinder, a compressed air chamber mounted adjacent said cylinder and having an opening exposed to said circumference, fluid sealing bars attached to said chamber at the opposite sides of said opening and across the width of said web of paper for controlling the air passage between said chamber and said Web of paper, and means on the other opposite sides of said chamber and extending to said cylinder at locations lateral of said web of paper for fluid sealing with said cylinder.

3. A means for controlling a web of paper, comprising a notatably mounted cylinder for supporting said web of paper when the latter is wrapped partly over the circumference of said cylinder and with the lateral edges of said web of paper spaced inwardly from the ends of said cylinder, a compressed air chamber mounted adjacent said cylinder and having an opening exposed to said circumference, fluid sealing bars movably attached to said chamber at the opposite sides of said opening and across the width of said web of paper for controlling the air passage between said chamber and said web of paper, adjustable means for urging said bars toward said web of paper, and means on the other opposite sides of said chamber and extending to said cylinder at locations laterally of said web of paper for fluid sealing with said cylinder.

4. A means for controlling a web of paper, comprising a rotatably mounted cylinder for supporting said web of paper when the latter is wrapped partly over the circumference of said cylinder and with the lateral edges of said web of paper spaced inwardly from the ends of said cylinder, a compressed air chamber mounted adjacent said cylinder and having an opening exposed to said circumference, fluid sealing bars movably attached to said chamber for movement toward and away from said circumference for controlling the air passage between said chamber and said web of paper, and spring means engaged with said bars for urging said bars toward said web of paper. 5. A means for controlling a web of paper, comprising a rotatably mounted cylinder for supporting said web of paper when the latter is wrapped partly over the circumference of said cylinder and with the lateral edges of said web of paper spaced inwardly from the ends of said cylinder, a compressed air chamber mounted adjacent said cylinder and having an opening exposed toward said circumference, fluid sealing bars attached to said cham ber at the opposite sides of said opening and across the 7 width of said web of paper and being movable toward References Cited in the file of this patent UNITED STATES PATENTS Van Derhoef Jan. 10, 1939 2,289,753 Capstaff July 14, 1942