Patent GB-1022781-A (GB)
Title: Mechanism for shirring lengths of extruded tubings suitable as sausage casings
IPC: A22C13/02
Filed: 1962-08-31
Abstract: 1,022,781. Shirring sausage casings. JOHNSON & JOHNSON. Aug. 31, 1962 [Aug. 31, 1961], No. 33542/62. Heading A2B. Sausage casing tubing of extruded collogen travels continuously along a mandrel 10, Fig. 1, through a drying chamber (not shown) to shirring rolls 16, 18, shirred cut lengths of casing are severed by cutters 24, 26, and the shirred cut lengths are sequentially compressed into successively smaller lengths during a stepwise rotation of a turret 22 upon which they are mounted, and are then delivered therefrom into a discharge shoot (not shown). While upon the mandrel 10 the tubing is inflated from within by air into which albumin powder is injected; the albumin assists the casing in surviving the cooking stresses and temperature. When mandrel 20 is in juxtaposition with mandrel 10, the inflating air is derived from line 23 at the turret. However, when these mandrels are spaced apart, an auxiliary air supply is provided to mandrel 10 by a line 432, Fig. 36, at the connecting flare 81. During the severance of shirred lengths by the cutters 24 and 26, an element 28 is held against the mandrel to impede the travel of the tubing fed by the rolls 12 and 14 until the shirred section has been severed. The shirring rolls incorporate spaced flexible wiping fingers 19 of sponge rubber, having a relatively long radius of bending for applying to the tubing a gentle, progressive and prolonged wiping action therebetween. A pair of air nozzles (not shown) disposed on each side of the mandrel in a horizontal plane, centre the tubing as it enters the bight between the shirring rolls. The shirring rolls are preferably rotated faster than the associated feed rolls 12 and 14. The shirring operation is facilitated by a sprung yieldable barrier 102 against which the leading end L of the shirred section bears. When a substantial section of tubing has been shirred the yieldable barrier is lowered, travels horizontally back to its original position and is raised to retard the advance of the leading end of the newly shirred section. With the rearward movement (in the direction A) of turret 22 and connected shirring and transport mandrels 10 and 20, a stripper mechanism 30 is lowered and advanced to transfer the completely severed and shirred section from mandrel 10 on to its temporarily associated transport mandrel 20. Turret 20 next returns to its original forward position; thereafter, stripper 30 returns to its original position. The pusher 234 of the stripper includes a notch 236 and a latch arm 238 to encircle the engaged mandrel. Turret 22 and connected shirring and transport mandrels 10 and 20 are then again moved rearwardly, but in this phase holders 32 and 34 engage the end of the mandrel 10, permitting the transport mandrel 20 to be disengaged. When turret 22 reaches the limit of its rearward travel, it is indexed to present the next successive transport mandrel 20 into alignment with shirring mandrel 10. Turret 22 is then returned to its original position, effecting a temporary detachable connection between shirring mandrel 10 and the newly presented transport mandrel 20. During the indexing steps of turret 22, previously shirred sections transferred on to associated transport mandrels 20 on turret 22 are rotated to and through three compression stations. With each forward movement of the turret the shirred length S is compressed against an abutment 38 in the front wall 36, which abutments are progressively longer as from the first to the third compression stations; during the compressions the mandrels 20 pass through openings 37 in the wall 36. At the ejection station, a gripper 175 effects the removal of the compressed shirred section off its associated transport mandrel. A momentary blast of air emitted through the mandrel 20 at the ejector station during the indexing of the turret, completes the movement of the shirred section through a shoot into a package receptacle.