Abstract: A powerized stapler device is disclosed including an electromagnet, preferably a solenoid, having a armature which is adjustable relative to the solenoid such that the permeable portions of the armature, in the non-energized condition of the solenoid, may be adjusted relative to the solenoid enabling the force exerted by the solenoid to be varied as a function of the initial position of the armature. In a further preferred embodiment, an extension of the armature is engaged with the stapler head whereby movements of the armature relative to the electromagnet also function to vary the space between the stapler head and the stapler anvil, adjustments to process thin work pieces functioning to reduce the spacing between stapler head and anvil as well as reducing the driving force exerted by the electromagnet.

Abstract: A tabbing machine for applying adhesive tabs over the edge of an article comprises a feed mechanism for advancing tabs from a roll of tape past a tab discharge station. A tab applicator station located downstream of the tab discharge station functions to press the adhesive surfaces of a tab carried by the lead edge of an article to be tabbed which is moved past the applicator station. The device includes a control mechanism having a first photo sensor which senses the presence or absence of an article to be tabbed and a second photo sensor downstream of the first photo sensor for sensing a tab positioned at a tab discharge station. The sensors are interconnected in such manner that the tape drive mechanism for feeding tabs can be energized only when the infeed table is clear of an article to be tabbed and when no tab is located at the discharge station. The position of a tab relative to an article to be tabbed is controllable responsive to adjustment of the second or tab locator sensor.