Web handling mechanism for carton-blank-forming apparatus or the like

Claim 2

Web-handling apparatus comprising a set of continuously metering rolls for a web, a pair of intermittent feed rolls for said web, a brake bar located between said pairs of rolls and shiftable between web-clamping and web release positions; whereby a web passing through said pair of metering rolls is repeatedly formed into a loop and the loop then pulled out, and a shiftable dancer located on the discharge side of said metering rolls for engagement by said loop and means for shifting said dancer in timed relationship with said loop whereby when the loop is being pulled out said loop contacts said dancer at a relatively closely matched velocity and when moving in the same direction.

Claim 3

The apparatus set forth in claim 1 further characterized in that said means for shifting said dancer comprises an adjustable linkage for varying the displacement of said dAncer to accommodate different repeat lengths of the web.

Claim 4

The apparatus of claim 2 including a cam for actuating said linkage in timed relationship with the feeding of said web.

Claim 5

The apparatus as described in claim 2 including air-loaded cylinder means for biasing said linkage against said cam and said dancer in one direction.

Claim 6

The apparatus set out in claim 4 further characterized in that said cylinder means includes a closed cylinder extending transversely in respect to the web, and a shiftable plunger is located at each end of said cylinder and biased by air pressure therein for said biasing of said linkage.

Claim 7

Web-handling apparatus comprising a set of continuously feeding web-metering rolls for precisely metering the speed of the web, a pair of intermittent feed rolls at the discharge side of said metering rolls and for intermittently feeding the web, a brake bar located between said pairs of rolls and adapted to shift between web-clamping and web release positions; whereby a web passing through said pair of metering rolls is formed into a loop when said brake bar is in said web-clamping position, and said loop is then pulled out of said web when said intermittent feed rolls are feeding and said brake bar is in the web-releasing position; and a shiftable dancer located between said metering rolls and said brake bar for shifting movement generally with said loop, and means for shifting said dancer in timed relationship with movement of said loop whereby when said feed rolls are pulling said loop out of said web, said loop contacts said dancer at a relatively closely matched velocity.

Claim 8

Web-handling apparatus comprising a set of continuously feeding web-metering rolls for precisely metering the speed of the web, a pair of intermittent feed rolls at the discharge side of said metering rolls and for intermittently feeding the web, a brake bar located between said pairs of rolls and adapted to shift between web-clamping and web release positions; whereby a web passing through said pair of metering rolls is formed into a loop when said brake bar is in said web-clamping position, and said loop is then pulled out of said web when said intermittent feed rolls are feeding and said brake bar is in the web-releasing position; and a shiftable dancer located between said metering rolls and said brake bar for shifting movement generally with said loop, and means for shifting said dancer in timed relationship with movement of said loop whereby when said feed rolls are pulling said loop out of said web, said loop contacts said dancer at a relatively closely matched velocity.

Claim 9

The apparatus set forth in claim 6 further characterized in that said means for shifting said dancer comprises an adjustable linkage for varying the displacement of said dancer to accommodate different repeat lengths of web.

Claim 10

The apparatus of claim 7 including a cam for actuating said linkage in timed relationship with the feeding of said web.

Claim 11

The apparatus as described in claim 7 including air-loaded cylinder means for biasing said linkage against said cam and said dancer in one direction.

Claim 12

The apparatus set out in claim 9 further characterized in that said cylinder means includes a closed cylinder extending transversely in respect to the web, and a shiftable plunger is located at each end of said cylinder and biased by air pressure therein for said biasing of said linkage.