Broadening and stretching roller for flexible webs

Claim 2

In a broadening and stretching roller for flexible webs having roller body means, a shaft of given diameter, and bearing means of given width for supporting said roller body means on said shaft, as well as mounting means for securing said bearing means between the shaft and the roller body means, said mounting means including tubular section members, end cups, and ring means, said bearing means being located in at least some of said tubular section members and in said end cups for supporting the tubular section members and the end cups on said shaft, the improvement comprising, corrosion resistant sleeve means located on said shaft and at least partially between the shaft and said end cups, and wherein said mounting means are made of plastics material.

Claim 3

The broadening and stretching roller according to claim 1, wherein said corrosion resistant sleeve means is a corrosion resistant metal coating on said shaft.

Claim 4

The broadening and stretching roller according to claim 1, wherein said corrosion resistant sleeve means is made of plastics material.

Claim 5

The broadening and stretching roller according to claim 1, wherein said mounting means are made of duro-plastics material.

Claim 6

The broadening and stretching roller according to claim 1, wherein said mounting means are made of thermo-plastics material.

Claim 7

The broadening and stretching roller according to claim 1, wherein each of said tubular section members of plastics material comprises a single piece tubular structure having a center portion with a length corresponding substantially to twice said given width of said bearing means, said center portion having a constant wall thickness throughout its length to provide a seat for said bearing means and a radially inwardly directed ring shoulder located adjacent to said bearing seat, said tubular structure further having two end portions of which one is located on each side of said center portion.

Claim 8

The broadening and stretching roller according to claim 6, wherein said end portions of the tubular structure have axially extending outer ends and an inner diameter which increases slightly from said center portion axially outwardly toward said outer ends whereby said end portions have a conical inner wall.

Claim 9

The broadening and stretching roller according to claim 7, wherein said outer ends have a cylindrical inner wall and an inner shoulder between said cylindrical inner wall and the adjacent conical inner wall.

Claim 10

The broadening and stretching roller according to claim 1, wherein each of said end cups of plastics material comprises a two piece structure including a first piece having an axially outwardly extending closure member, an end portion extending axially inwardly relative to the roller and a center portion between the closure member and said end portion, as well as a slanting portion connecting the center portion and the closure member, said center portion having an inner diameter corresponding to the outer diameter of said bearing means, said closure member having a bore therethrough extending concentrically to said shaft and having an inner diameter corresponding substantially to said given diameter of the shaft, said closure member having an inward face and concentric grooves separated by respective ring walls in said inward face, and a second piece formed as a bushing having an outer diameter forming a seat for said bearing means and a sealing end portion provided with concentric projecting rings which fit into the concentric grooves between said ring walls of said closure member of the first piece.

Claim 11

The broadening and stretching roller according to claim 9, further comprising a corrosion protected sealing ring, said concentric grooves with their respective ring walls of the first piece and the concentric projecting rings of the second piece forming a labyrinth for receiving a sealing medium, said corrosion protected sealing ring being located between said bearing means and said labyrinth for sealing the latter from said bearing means.

Claim 12

The broadening and stretching roller according to claim 6, wherein said ring means comprise bearing means locating rings of plastics material positioned in said tubular section members for holding a respective one of said bearing means in a fixed position against said ring shoulder.

Claim 13

The broadening and stretching roller according to claim 9, further comprising shoulder means defined inside at least one of said first and second pieces of the end cups adjacent to the seat for said bearing means, and wherein said ring means comprise bearing means locating rings of plastics material positioned in said end cups for holding a respective one of said bearing means in a fixed position against said shoulder means.

Claim 14

The broadening and stretching roller according to claim 1, wherein said ring means comprise connecting rings of plastics material located between adjacent tubular section members as well as between an end cup and an adjacent tubular member, each of said connecting rings comprising a single piece ring having a cylindrical portion, a radially outwardly bulging portion, and an intermediate portion with a radially outwardly extending ridge between the cylindrical portion and the bulging portion.

Claim 15

The broadening and stretching roller according to claim 1, wherein said bearing mounting means are so dimensioned that said bearing means are surrounded by plastics material.

Claim 16

The broadening and stretching roller according to claim 9, wherein said closure member has an outer threading thereon, said roller further comprising a cylindrical shell of elastic material and shell securing means having a bore with an inner thread and a inwardly slanting edge, said inner thread fitting on said outer threading of the closure member whereby said edge surrounds the ends of the shell to press said ends against the slanting portion of the respective end cup.