GB1390021A - Sub-dividing elongated members - Google Patents

Abstract

1390021 Controlling shearing machines WILKINS & MITCHELL Ltd 9 Feb 1972 [9 Feb 1971] 4298/71 Heading B3W A billet 19 with front and rear end portions of unacceptable quality is fed by rolls (only roll 14 shown) against a front stop 16. The feed rolls are stopped and, the stop 16 having been retracted, pinch rolls 28 feed the billet until the defective portion 20 is to the right of the shear plane of sheet 10, 11. Hold down 13 is actuated and then blade 10 shears off the defective portion. The hold down 13 is raised and the feed rolls 14 &c. feed the billet against a back stop 15 spaced from the shear plane by a distance equal to the length d of the identical pieces 22-27 into which the billet is to be divided. The cycle of feeding, clamping and shearing continues until a photo-cell 17, also spaced from the shear plane by distance d, detects the passage of the trailing end of the billet and thus that a portion remains which is between d and 2d in length. The stop 16 is raised to stop the following billet. A second photo-cell 18 is so positioned that, if the trailing end clears it, the portion 27, 21 does not include a portion long enough to be held by hold down 13 whilst the piece 27 is sheared from it. In this case, control means of the apparatus prevents further shearing taking place, the portion 27, 21 being pushed out by the following billet. Such portions may be fed to the shear from the delivery side with the piece 27 against the stop 16 and held by hold down 13 while the defective portion 21 is sheared off. If the trailing end does not clear the photo-cell 18 one more shearing stroke is carried out and the following billet ejects the defective portion 21. The position of the back stop 15 may be adjusted automatically in dependence on the weight per unit length of the billet signalled to the stop form weighing apparatus.