Abstract: A roller for distributing a coating material such as ink in a press is mounted on a shaft for sliding axially on and rotating on the shaft. First and second internally threaded sleeves are fixed internally of the roller coaxially with each other and concentric to the shaft. One of the threads has a left hand twist and the other has a right hand twist. Two follower plungers, one having left hand thread segments and the other having right hand thread segments are meshed alternately with the left and right hand twist square threads. A link spans between double armed levers which connect to the follower plungers, respectively. When one plunger is automatically forced out of engagement with its cooperating thread in the one sleeve, a force is transmitted through the link to the other lever which causes the other follower plunger and its thread segments to mesh with the internal threads on the other sleeve so the roller changes the direction of its axial movement.

Abstract: Print rollers are used on a flatbed screen printer to force the ink through the screen. There is provided scraper blades on either side of the roller assembly so that on the return stroke of the roller assembly some of the printing ink is brought back to the lead roller when it starts its movement. This will insure a supply of ink to the lead roller when it moves into the pattern area of the screen thus giving a more uniform ink deposition across the pattern.

Abstract: A mine safety inspection indicator including a plurality of rotatable wheels having indicia printed on one side thereof and attached to a panel having windows therein so that the indicia is selectively visible through the windows, and further including slideable indicators whose position is correlated with indicia for giving further information, the wheels and slideable indicators including printing members cooperable with recording paper and a pressure member so as to provide a permanent record of a mine safety inspection; the device also includes a slideable warning panel which may be moved to a position out of view or moved to a visible position for giving a warning of a dangerous condition in a mine.

Abstract: A machine particularly adapted for printing card stock. A head or carriage is mounted to reciprocate over a type bed. The carriage mounts the impression roller, inking rollers, doctor roller and an oscillating roller. The impression roller is mounted on an adjustable eccentric shaft adjustable to compensate for different thicknesses of card stock to thereby control the printing pressure. The impression roller is driven through roller members that move on rails which are coupled by way of a positive clutch to the ends of the impression roller which is positively driven in any adjusted position. The inking rollers, oscillating and doctor roller are mounted between side plates of the carriage, improved means being provided for lifting the inking rollers and for lifting the oscillating roller and doctor roller.