GB464862A - Improvements in shearing-mechanism for use with devices for feeding molten glass to forming machines - Google Patents

Abstract

464,862. Glass manufacture. PEARSON, T. F. Sept. 23, 1935, No. 26245. [Class 56] Relates to a shearing-device for use with apparatus for feeding molten glass, particularly of the kind in which a charge of glass is gathered by suction in a cup that delivers it to a parison mould. According to the present invention, a pair of blades is mounted on an arm which swings about a vertical axis, and both blades reciprocate in a direction parallel with the arm when cutting the glass. The arm that carries the blades is constituted by a rod 16, Figs. 1, and a sleeve 22 that slides on the rod, one of the blades 10 being attached to the sleeve while the other is carried by a bracket 15 adjustably attached to the rod. The sleeve 22 has an extension 21, Fig. 3, which is in sliding contact with a bracket 19 secured to the rod 16. A screw 18 enables the bracket 15 to be adjusted angularly in relation to the bracket 19 and thus enables the spacing between the planes of the blades to be adjusted. The rod 16 slides through a sleeve 40, Fig. 7, carried by a head 32 secured to the upper end of a vertical spindle 30. The sleeve 22 slides over the sleeve 40, and the rod 16 and the sleeve 22 are connected by links 23 to a disc 26 rotatable on the spindle 30. A spring 31 surrounds the spindle, and is secured at its ends to the disc 26 and to a vertical standard 29 in which the spindle 30 is journalled. The pressure of the spring holds the disc 26 against the head 32, and a ball 33, pressed downwards by a spring, engages a depression in the disc. A pin 27 depending from the disc moves in a recess 28 formed in the edge of the standard 29. In operation, the spindle 30 is oscillated by suitable means, such as a rotating cam, so that the blades swing to and from the point at which the glass is gathered. As the blades swing towards this position, the pressure of the ball 33 forces the disc 26 to move with the head 32, and the spring 31 is stressed. When the pin 27 strikes the end of the recess 28, movement of the disc 26 is stopped and the continued movement of the head 32 causes the ball 33 to rise out of the depression in the disc. The tension in the spring 31 then rotates the disc 26, in a reverse direction, to its original position, and this rotation moves the links 23 and causes the blades 10 to approach one another and cut the glass. The spindle 30 then swings the blade arm backwards, and the ball 33 again enters the depression in the disc 26.