Method and an arrangement for the feeding of a material web
AssigneeAB Tetra Pak
InventorsAlf Billberg, Gote L. Bernle
Life of this patent
Estimating the term…
Abstract
A method and arrangement for severing packaging blanks, including a drive roller, a register roller at a location downstream of the drive roller and high-speed driving rollers downstream of the register roller for removing severed web portions. The drive roller is provided with a circumferential web-engaging surface and a knife located in a circumferential gap in the web-engaging surface. The drive roller cooperates with a counter roller, and a pendulum roller is located upstream of drive roller.
Claims13
Apparatus for severing packaging blanks from a continuous web having recesses at uniform intervals along longitudinal edge portions of the continuous web, said apparatus comprising:
- a drive roller and a counter roller rotatable in cooperation with each other and positioned at a first location along a web feed path, said drive roller having a circumferential surface adaped to frictionally engage the continuous web, whereby a length of the continuous web may be fed from the drive roller along said web feed path, one of said drive roller and said counter roller having a circumferential gap whereby the frictional engagement between the drive roller and the continuous web may be periodically interrupted;
- means for transversely severing the continuous web, said severing means being located on one of said drive roller and said counter roller along said circumferential gap;
- a registration roller at a location along said feed path downstream of said drive roller and said counter roller, said registration roller provided with a radial projection adapted to temporarily engage an edge of the web recesses, said registation roller rotating said radial projection into a predetermined registration position, whereby the length of the continuous web fed along said web feed path may be adjusted to a predetermined length;
- means for synchronously rotating the one of said drive roller and said counter roller in which the circumferential gap is provided with said registration roller so that said radial projection of the registration roller is adapted to temporarily engage the continuous web during said periodic interruption of the frictional engagement of the drive roller and the transverse severance of the web occurs concurrently with the rotation of the radial projection into said predetermined registration position;
- and
- means for removing a severed web portion from the web feed path.
A method of severing packaging blanks of a predetermined length from a continuous web having recesses at uniform intervals along longitudinal edge portions of the continuous web, said method comprising the steps of:
- continuously rotating a drive roller and a register roller;
- feeding the continuous web along a feed path beyond said drive roller toward said register roller by frictionally engaging the continuous web with a circumferential surface of the drive roller;
- adjusting the length of the continuous web fed beyond the drive roller by temporarily relieving the frictional engagement between the continuous web and the drive roller with a circumferential gap in said circumferential surface of the drive roller and concurrently feeding the continuous web with the register roller by temporarily engaging a radial projection of said register roller with an edge of the web recesses;
- as said temporarily engaged radial projection rotates with said register roller into a predetermined registration position, transversely severing the continuous web with severing means which is affixed to said drive roller;
- removing a severed web portion from said feed path.
Dependencies are inferred from the claim text.