| 摘要 |
1,135,819. Stencil printing machine. INTERNATIONAL BUSINESS MACHINES CORP. 18 May, 1967 [24 June, 1966], No. 23007/67. Heading B6C. [Also in Division H1] An apparatus for the extrusion printing of electrical circuit elements on a substrate comprises a stencil, an extruder nozzle driving means for moving the nozzle across the stencil and means for extruding printing pigment through the nozzle. The described apparatus, Fig. 3, produces three stencilled resistance areas on a ceramic substrate 4 by sweeping a pigment extruding nozzle 11 over the upper face of a stencil 7 securely held in a recess 39 of a fixed plate 19. The nozzle 11, which is spring- loaded on to the upper stencil face, is reciprocated across the stencil by an hydraulically operated piston and cylinder arrangement 85, 86, each stroke of the piston corresponding to the stencil printing of one substrate. The individual substrates 4 are spring- pressed on a support platen 16 against the under-surface of the stencil, lowering of the platen for substrate replacement purposes being effected through an hydraulic piston and cylinder arrangement 25, 26. Fluid pressure via a hose 51 is used to force printing pigment 47 from a chamber 46 through the nozzle 11. The stencil 7 comprises a plate having, on its underside, three recesses 11, 3<SP>1</SP>, 2<SP>1</SP> (not shown), Fig. 9, corresponding to the three resistance areas to be printed, the pigment passing to the recesses during the sweep of the nozzle 11 through a multiplicity of holes 8 above the recesses. |
