Abstract: A screen printing machine includes a pair of transversely spaced first rollers mounted for rotation about axes located in a common substantially horizontal plane, and a second roller which is mounted for rotation about a second axis substantially paralleling the first axes and being located in a higher second plane. An endless printing screen is placed about the rollers to be entrained by the same; in the space between the first rollers it defines a printing run. First adjusting arrangements are provided by means of which the second roller can be raised and lowered with reference to the first rollers, and second adjustments are provided by means of which the second roller can be displaced in its horizontal plane transversely of its axis of rotation.

Abstract: A printing machine has a printing station, certain components of which require intermittent cleaning due to fouling by the printing ink. An endless printing blanket is trained about a reversing roller that is spaced lengthwise of the machine from the printing station; the printing blanket has an upper run extending beneath the printing station and carrying the workpiece to be printed. The upper run is inclined downwardly with respect to the horizontal in direction from the printing station towards the reversing roller. A cleaning arrangement is provided for at times admitting a cleaning liquid into the printing station so as the clean the ink off the components, whereupon the liquid will run off the components onto the upper run of the printing blanket. Liquid-intercepting side members are provided which extend along the respective lateral edge portions of the upper run to the reversing roller and which prevent the liquid from running off the lateral edge portions into the machine.

Abstract: A silk screen printing machine wherein a hollow endless stencil surrounds a liquid applying roll and the latter is driven independently of the stencil by a detachable infinitely variable speed drive having a gear which is keyed to an extension at one end of the shaft for the liquid applying roll. The drive is mounted on a carriage so that it can be transported between several screen printing stations.

Abstract: Three rollers are mounted on a support for rotation about parallel axes which are respectively located at the corners of an imaginary triangle. A flexible printing screen is trained about the rollers to be frictionally entrained thereby. Mounting arrangements are provided at the opposite axial ends of the rollers, journalling the same for rotation, and intermediate these mounting arrangements there are provided supplementary mounting arrangements which engage each of the rollers intermediate the main mounting arrangements.

Abstract: A controll device for controlling the level of a liquid in a container, a tank, a printing machine, or the like, which includes an elongated member in form of a tube or a cable, having a free end adjacent the desired maximum liquid level in the container and being adapted to feed a control medium, i.e., a gas, electric current, or light therethrough, which acts on a signalling device, or control means of a pump for feeding liquid in the container and which are actuated when the liquid reaches the free end of the elongated member. The elonated member being adjustably mounted for adjusting the position of the free end thereof in vertical direction.

Abstract: A screen printing machine wherein one end of a rotary stencil is driven by a power train which receives torque from a motor. The other end of the stencil is driven by the power train through the medium of a cylindrical squeegee which is disposed in the stencil and drives an idler gear in the frame of the machine. The idler gear rotates a gear which drives the other end of the stencil. The ends of the stencil are coupled to driving sleeves which are rotatable in discrete bearing members each of which is adjustable relative to the machine frame. That bearing member which receives the driving sleeve for the one end of the stencil is pivotable in the frame about an axis which is normal to the axis of the stencil and is also movable in the axial direction of the stencil. The other bearing member is pivotable in the frame about an axis which is normal to the axis of the stencil and is also movable transversely of the axis of the stencil.

Abstract: A screen printing machine wherein the stencil rotates above a hollow counter-pressure beam having a rectangular profile and carrying a removable strip which engages the underside of the back cloth. The beam is stiffened by two tie rods which are adjacent to its side faces and extend through bearings affixed to the lower portion of the beam. Upward flexing of median portions of the tie rods is prevented or controlled by vertical bolts which mesh with brackets secured to the beam and whose lower end portions abut against flats on the median portions of the respective tie rods. The tie rods are tensioned by nuts so that they prevent the median portion of the beam from sagging under its own weight and/or due to pressure which is exerted by the central portion of the stencil through the medium of the fabric and back cloth.