Patent GB-823975-A (GB)
Title: Improvements in printing apparatus
Inventor: ABEL WALTER
IPC: B41F19/06
Filed: 1956-09-05
Abstract: 823,975. Embossing. MEASURE-METERS CO. Ltd. Sept. 4, 1957 [Sept. 5, 1956], No. 27087/56. Class 100(2) Apparatus for printing numbers, letters or the like from blocking foil on to a surface comprises a printing roller, the printing surface of which is formed of thermally conductive material e.g. steel or brass, provided with means for its internal heating, the printing surface being interrupted by a recess extending circumferentially around the roller, and a drive for the roller which is interrupted after a predetermined angular displacement of the roller during which printing occurs. In one form, Fig. 1, the machine prints figures on the peripheries of wheels such as T. The printing roller p has a printing surface P, Fig. 4, of twice the diameter of the wheel T and a recess r and is mounted on a shaft C driven through gearing a, A, b, B, c by an electric motor M. The wheel T is removably mounted on a spindle D being located against a fixed disc t thereon; a removable supporting disc t<SP>1</SP> is placed on the spindle on the other side of the wheel T and a knurled nut t<SP>2</SP> is screwed on the spindle to hold the wheel and disc t<SP>1</SP> in position and secure them against rotation relative to the spindle. The spindle D is mounted in a pivoted frame E which is loaded by a spring F to cause the wheel T to engage the printing. surface P. A stop -e prevents the wheel T from entering the recess r in the printing roller. The spindle D is driven from the shaft C by a 2 :1 step-up gear so that the wheel T and printing surface P have the same pheripheral speed. The gear wheel c has a toothless portion (Fig. 3,. not shown), which interrupts the driveto the printing roller after one revolution thereof when the recess r is opposite the wheel T; at the same time as the drive is thus interrupted a cam c<SP>2</SP> on the shaft C actuates a microswitch m to stop themotor M. The printing surface is heated electrically by an internal resistance and makes an impression on the wheel T' through a strip of blocking foil R which is fed between the surface and the wheel from a reel. The tightening of the nut t<SP>2</SP> on the spindle D rotates the spindle and the shaft C so that the toothed portion of the gear wheel c re-engages the teeth. of the gear wheel B and the cam c<SP>2</SP> actuates the microswitch m to start the motor. A new blank wheel is placed on the spindle D after each revolution of the printing roller p. In another form, Fig. 4, the machine is adapted to print at intervals on a web of textile or other material T<SP>1</SP>. The frame E and spindle D are dispensed with and the web T<SP>1</SP> is fed continuously between the printing roller p and a spring loaded impression roller Q. After one impression has been made and when the recess r is adjacent to the web T<SP>1</SP> the drive is interrupted and motor stopped, the recess allowing the material T<SP>1</SP> to move freely without touching the roller. The machine is restarted, for making a further impression, by a pawl mounted against the gear wheel c or a gear driven thereby, and which is actuated partially to rotate the shaft C by a measuring device driven by a wheel engaging the travelling web so that the printing roller drive is re-engaged at predetermined intervals. In order to print a sequence of two or more strips of lettering, e.g. at intervals on the selvedge of a length of fabric, the printing surface P may be interrupted by two or more recesses r the gear wheel c having two or more toothless portions and the came c<SP>2</SP> being correspondingly formed to actuate the microswitch two or more times per revolution.