Patent GB-946286-A (GB)
Title: Screen printing carriage
IPC: B41F15/08
Filed: 1962-11-22
Abstract: 946,286. Stencilling-apparatus. FOTOTINTURO S.A., and J. M. NOS. Nov. 22, 1962 [Dec. 2, 1961; Dec. 6, 1961 (2) ; Feb. 20, 1962 (2)], No. 44234/62. Heading B6C.  A screen-printing carriage 1 comprises a carriage structure 4 provided with means for movement of the carriage along a printing table supporting a cloth to be printed, means for locking the structure 4 at each printing station, a screen frame holder 94 hinged to the structure and supporting a screen frame 5 which is secured thereto by rammers 150, 151, 152, means for raising and lowering the frame 94, a tiltable squeegee holder 6 having two angularly mounted and alternately operable squeegees 103 and being slidable along guides provided in the frame 5 while one squeegee is in the operative position, cam means for controlling, synchronously, the movement of the carriage, the looking of the carriage, the raising and lowering of the holder 94 and the sliding of the holder 6, and electric equipment cooperating with said cam means and including a driving motor 7, a contact for electrically braking the motor on contact with register stop clamping means, a contact for causing forward movement of the carriage in two different register stop clamp series, and a stop contact combined with a timing relay. Colour is applied between the two squeegees and with the carriage adjusted in the first register position by a locking lever, Fig. 12 (not shown), a button is pressed and the motor 7 drives a shaft 15, which is declutched at 46, and a shaft 18 which drives a cam box 12, Figs. 1 and 7. A cam 24 in the box through bevel gearing, Fig. 6 (not shown), causes the holder 6 to be chain driven across the screen 110 with the rear squeegee 103 in contact with the screen. The return movement of the holder is effected with the other squeegee in contact with the screen. The rubber squeegees 103 are secured in position by screws 109 contacting stems 103a and the squeegees are adjustable vertically and laterally by screw and slot means, Fig. 14 (not shown). A cam 25 then causes the screen frame holder 94 to be raised on its hinge pins, Fig. 13 (not shown), a double cam 20-21 disengages the locking lever, and a double cam 22-23 causes a clutch 46 to be engaged so that the carriage 1 moves forward on its wheels 50, 53 until a microswitch is actuated by a register clamp stop in an odd-number position, i.e. leaving an unprinted evennumber position. The motor 7 is stopped and braked by means 8, the duration of the stop being determined by a stop contact controlled by a timing relay, Fig. 28 (not shown). The motor is then started, the carriage locked and the clutch 46 disengaged by double cams 20- 21 and 22-23 respectively and the holder 94 lowered by cam 25. At the end of the table a stop actuates a microswitch and the motor 7 is stopped and restarted in reverse at a higher speed causing the return of the carriage to its initial position where a further stop causes the motor to revert to its lower speed in a forward direction. The carriage then moves forward and in a second printing phase prints at the evennumber positions. The wheel 50 of the carriage 1 is grooved and co-operates with a toothed rack 52 secured to the printing table 2.