Patent GB-462616-A (GB)
Title: Improvements relating to machines for making caps or covers for jars
IPC: B21D51/44
Filed: 1935-10-26
Abstract: 462,616. Shaping caps for jars. THORNHILL, G. A. Oct. 26, 1935, No. 29573. [Class 100 (ii)] [Also in Group XVII] A machine for making caps or covers for jars comprises a container for discs of cardboard or other suitable material in pack form, means for moving the foremost disc of the pack into forming position, rotatable gripping members adapted to hold said disc, a folding member adapted to turn the exposed part of the disc over one of said gripping members, and a grooved forming roller arranged to press the turned-over edge of the disc into contact with the edge of said one gripping member. The main driving member b is supported in a bearing b<1> depending from a frame a<1> which supports a horizontal table a carrying a hopper c for the discs. A front plate d extends on each side of the hopper and has a circular aperture d<1> forming the hopper mouth. A pusher plate e is mounted to slide in a groove f on the face of the front plate d, being guided by a flat cover plate e<1> secured to the plate d by screws e<2> to push the foremost disc into a recess d<2> in the plate d, where it rests on a sole piece d<3> with a curved surface d<4>. The plate e is moved by a lever g pivoted at g<1> and having a roller g<2> engaging a cam g<3>. The upper end of the lever engages a pin i secured to the plate e and projecting through a slit in the cover plate e<1>. A trigger j is pivoted on the arm g and is notched at one end to engage with a spring- loaded lever j<2>, the other end being attached by a spring j<3> to the arm g. Thus, the lever is put out of action if the plate e becomes jammed and if desired the movement of the trigger j may also switch off the driving motor. The discs are fed forward by an angle plate k to a stud k<1> on which is secured a cord or chain k<2> passing over a pulley k<3> and carrying a weight k<4>. The forming members comprise two spindles l, m carrying circular plates n, o, and spindle l with plate n moves under the influence of a lever p<1> pivoted at q<1> and engaged by a face cam p on the shaft b to grip the disc x between plates n, o, and move it clear of the sole piece d<3>. If desired, both plates may be made to move towards one another. The spindles and plates are caused to rotate by sprocket wheel m<2>, slidably keyed on spindle m, chaim m<3>, and driving sprocket m<4> on driving shaft b. Spindle l is frictionally driven from spindle m. Plate o may be grooved as at o<1> to cause a slight annular indentation of the disc when the plates are approached, and plate n has a half circular section around its circumference to co-operate with a folding member s and a grooved forming roller t mounted on a spindle t<1> in the upper end of a pivoted arm v the lower end of which is actuated by a cam v<2>. The spindle t<1> is driven from chain m<3> by a sprocket t<2>. As the revolving plates n, o move axially the edge of the disc encounters folding member s and is bent through a rightangle, and cam v<2> then brings the grooved roller t, which may be heated, into contact with the edge of the disc. The formed cap is detached from the member n by a series of pivoted fingers w arranged on a stationary boss q<2> as the member n moves backwards under the influence of spring l<2>. A hand wheel y is provided to permit the machine to turn slowly for making adjustments.