Abstract: A system for registering a work support pallet on a carousel machine arm with a screen frame of the machine has pivot components on a pallet tool and on the arm for detachable pivotable mounting of the pallet tool relative to the arm for accurate pivotal movement of the pallet tool into proximity with the screen frame.

Abstract: A detachably mounted pallet tool is utilized on the arms of a carousel printing machine and work support pallets thereon to provide a more efficient and rapid registration with stationary screen frames associated with the machine, without removal of work support pallets from the arms. A bracket on an arm and cooperating fitting on the pallet tool provide for quick, detachable mounting and removal of the pallet tool.

Abstract: A screen frame assembly for mounting a printing screen includes a rectangular screen frame proper having a rectangular opening, and screen anchor members removably secured to frame anchor members along the four sides of the frame opening and having bonding surfaces to be adhesively or otherwise bonded to the screen edges for securing the screen to the frame. The screen anchor members are separable from the frame anchor members to clean the screen anchor members for reuse and to replace screen anchor members which are damaged or otherwise unusable.

Abstract: A screen frame assembly for mounting a printing screen includes a rectangular screen frame proper having a rectangular opening, and screen anchor members removably secured to frame anchor members along the four sides of the frame opening and having bonding surfaces to be adhesively or otherwise bonded to the screen edges for securing the screen to the frame. The screen anchor members are separable from the frame anchor members to clean the screen anchor members for reuse and to replace screen anchor members which are damaged or otherwise unusable.

Abstract: A silk screen printing frame having screen tensioning rollers which are rotatable to stretch a printing screen edgewise across the frame and are mounted on the frame by improved roller mounting assemblies that secure the rollers to roller mounting members at the roller ends. Each roller mounting assembly has an end block portion fixed within the adjacent roller end, a wrench engaging portion beyond the roller end by which the roller may be turned and which may be integral with or a separate part from the end block portion, a bolt extending axially through the end block and wrench engaging portions and the adjacent roller mounting member, and a lock nut threaded on the outer end of the bolt for releasably securing the roller against turning. A head on the inner end of the bolt engages the inner side of the end block portion to restrain the bolt against being pulled outwardly through the assembly when the lock nut is tightened to secure the roller against turning.

Abstract: A relatively light weight screen printing frame structure particularly adapted for use in making relatively large area screen prints. The frame structure has an open rectangular screen frame proper including truss frame members along at least two opposing sides of the frame which mount screen gripping and tensioning means and have a unique open truss construction which resists bending of these frame members by the screen tension forces and other forces acting on these members during screen printing operations. In the preferred screen frame structure described, the reinforcing truss structures of the truss frame members are located inwardly of the screen gripping and tensioning means in such a way as to minimize the overall size and weight of a frame structure for supporting a printing screen of any given useful area.

Abstract: A silk screen frame is removably attached directly to the screen frame carrier of a silk screen printing apparatus, such as the reciprocating screen frame support carriage of a silk screen press, by novel mounting brackets which are attached directly to the carrier and screen frame in such a way as to eliminate the need for the relatively heavy and costly master frame or the like which is commonly used to support the screen frame in conventional silk screen apparatus. The mounting brackets are uniquely constructed and adjustable relative to the screen frame and screen frame carrier to accommodate different screen frame types, including conventional frames, and a range of screen frame sizes and to permit precise alignment of the screen frame relative to the screen frame carrier.

Abstract: A frame structure for supporting a stretched printing screen of the kind used in the so-called silkscreen printing process. The frame structure is intended for use in screen printing relatively large surface areas, and comprises frame members which are joined at their ends to form an open rectangular screen frame across one side of which the printing screen is stretched. At least two opposing frame members of the screen frame have a unique truss construction which resists either or both vertical bending or sagging of the frame when it is raised and lowered during a screen printing operation and inward bowing of the opposing frame members in the plane of the frame by tension in the stretched printing screen.

Abstract: An improved printing screen stretch frame of the kind having rollers which grip the screen edges and are rotatable to stretch the screen edgewise. The rollers have a unique sealed tubular construction and are coupled at their ends to roller support brackets in a novel way which minimizes or eliminates many costly machining operations that are involved in fabricating conventional stretch frames. The preferred stretch frame has four roller mounting brackets situated at the four corners of a rectangle and rollers coupled at their ends to the adjacent brackets to form a stretch frame consisting of only the rollers and roller mounting brackets.

Abstract: An improved mounting assembly for removably mounting a stencil screen stretch frame in a so-called silkscreen printing press in a manner which facilitates removal and replacement of the screen frame, reduces the frame cost, and renders the frame easier to handle and stack. The mounting assembly includes mounting means to be secured to the frame mounting portion of the printing press and readily accessible, easily releasible fastening means releasibly securing the screen frame to the mounting means.

Abstract: A stretch frame for sheet material such as printing screen utilizes tensioning rollers to be secured to the sheet edges and then rotated to stress the sheet material. The rollers may be rotatably received within laterally opening channels in the frame and restrained against reverse rotation to release the sheet tension by a ratchet device extending along a substantial length of each roller. This construction insures that the printing screen or other web shaped material is rigidly held in place.

Abstract: Hinge apparatus for connecting first and second associated members which includes a pivot shaft, a bracket for releasably fixing the shaft to the first associated member, and a bracket for mounting the shaft on the second associated member for relative angular motion. The pivot shaft may be biased to at least one angular position by means of a third member fixed to the shaft and a fourth member carried on the second member. The third member may be a crank arm fixed to the shaft and a fourth member may be reciprocally mounted. The hinge apparatus may be part of a screen printing apparatus. The first member may be a frame and the second member may be a support. At least one spacer may be disposed intermediate the support and the frame at a point spaced from the pivot shaft. The support may include a platen dimensioned and configured to accept a generally planar axial extremity of each spacer.