Patent GB-219394-A (GB)
Title: Improvements in or relating to mechanism for stamping marks upon shoe soles or similar articles
IPC: A43D95/14
Filed: 1923-04-25
Abstract: 219,394. British United Shoe Machin ery Co., Ltd., Woodcock, R. B., Elliott, H. E., Roberts, W. T. B., and Richs, F. April 25, 1923. Embossing.-Relates to machines for stamping marks upon shoe soles and similar articles, more particularly to evening and grading machines of the kind described in Specification 18752/12, [Class 106 (ii), Dynamometers &c.], and consists in the provision of mechanism for marking a moving work-piece whereby substantially uniform stamping impact of work and stamp is obtained automatically despite variations in work thickness. This uniformity of impact is obtained (a) by automatically varying the starting position of the stamping stroke to maintain the stroke constant or (b) by terminating the application of the driving force before the stamping or driven member reaches the work, the stamping member continuing to move under its own momentum. As shown in Figs. 4, 5, and 7, a stop 14 is mounted on the printing head 11 so as to be adjusted horizontally and vertically relatively thereto, to agree with variation in work thickness, and is engaged by a continuously rotating cam 12 to lift the head 11 to the required height against the pressure of a spring- actuated arm and then to release it to stamp the work. The vertical adjustment of the stop 14 keeps the stamp stroke constant and the horizontal adjustment determines the time of release of the stamp head to prevent dwell of the stamp on thicker work-pieces as described in the above Specification. Adjustment of the stop is obtained from a bar 55 automatically moved longitudinally in accordance with variation in workthickness and having a cam slot P<2> engaged by a pin on a horizontally movable arm P, the stop 14 being free to slide vertically in the arm P and having a pin 21 engaging a cam slot 19 in a plate 20 attached to the printing head. Movement of the bar 55 causes a horizontal movement of the arm P, and therefore of the stop 14, and the slot 19 causes a corresponding vertical movement of the stop. A fixed stop 10 on the printing head is engaged by the leading end of the cam 12 to lift the head 11 off the work, as soon as stamping has been effected, to prevent a second impression being made by a rebound of the stamp. The cam is cut away at 17 so that before the stamp reaches its highest position the cam passes out of engagement with the stop 10 and the head 11 is supported by the engagement of the trailing end 18 of the cam with the stop 14. In the form shown in Figs. 1 and 2, the stamp head 2 is provided only with a fixed stop 8 which is engaged by the cam 7 to lift the head against the pressure of a spring-actuated arm 1 and then to release it. A stop 3 on the fixed frame 4 of the machine engages the arm 1 after it has descended a certain distance, whereupon the stamp head 2 continues its downward movement under its own momentum until it stamps the work-piece. A weak spring 6 is extended during the stamping- stroke and serves to prevent a second impression of the stamp after its rebound from the work. Specifications 14918/99, 11397/03, 28661/03, [all in Class 101, Printing other than letterpress &c.] ; 22849/14, 133,435, and 195,758 also are referred to.