A machine tool having a head with a rotatable spindle including an extensible bar for holding a tool and which is axially movable between fully retracted and fully extended positions with several intermediate additional machining positions established by selectively operable stops. Large diameter tools with a flange and mounting taper (as may be provided by a tool adapter which mounts the tool) may be used with complete fit of the mounting taper with a spindle taper, and backup support of the to...

A machine tool is provided with a traversing work table that has a mounting plate supported for vertical reciprocation and rotary indexing movement. A pallet is supported on the mounting plate and releasably locked to it by a bayonet connection with a clamp ring which is selectively rotatable in the mounting plate; and the pallet also has an annular toothed coupling meshed with a segmented annular toothed coupling in the base. Rotary indexing is permitted by elevating the mounting plate only eno...

A modified wire guide and assembly method for facilitating the insertion of wires into a dot matrix print head. In the preferred embodiment, the wire guide has a planar surface with downwardly extending wire holes defined by first and second surfaces. The first surface has a truncated conical shape and the second surface has a cylindrical shape. Additionally, the wire guide has an upwardly extending, inclined cam surface that intersects the planar surface to form a closed path. The first surface...

A float activated gauge includes a float, a frame for guiding the vertical movement of the float, and a twisted metal strip coacting with the float to provide a visual indication of the vertical position of the float. The frame is held in position by an easily assembled head comprising a ring body and a cap. The frame comprises two vertical rods, each of which terminates on its upper end in an outwardly extending stub. When assembled, the rods and stubs of the frame are sandwiched between the ca...

This invention involves methods and apparatus relating to the assembly and structure of a dot matrix print head. The invention includes a single unit, coil assembly of a bobbin, coil, and clapper which can be removeably placed as a unit among fixed pole pieces and yoke members in the print head. The print head also includes a supporting arrangement for the coil assemblies which automatically aligns the clapper of each coil assembly with the impact end of one of the print wires during the assembl...

Power drive and timing train mechanism for serial printer mounted in an injection molded base by means of novel plastic bearings and without the usual fastening hardware, and including jack shaft belt-driven by start-stop on demand motor and, through two electrically operated clutches, separately driving power transfer and take up reel shafts, latter lifts ribbon to active position and rotates take up reel connected to print head by novel flexible driven member and retaining coupling at each end...

A bi-directional vent for a fuel tank utilizes a resilient sealing member which in its unflexed state is a simple resilient washer. The sealing member is disposed inside a vent body, and forms both an inner and outer seal. The inner seal is formed between an inner circumferential edge on a central hole in the washer and a conical sealing surface attached to the vent body. The outer seal is formed between an outer annular sealing surface on the washer and a circumferential edge formed on a centra...

This invention involves methods and apparatus relating to the assembly and structure of a dot matrix print head. In the preferred embodiment, the tops of the bobbins, yoke members, and pole pieces are ground flush in a common plane. The common plane is then used as a reference to mount and assembly remaining elements of the print head including the clapper members and backstop for the clapper members. The clapper members are mounted for pivotal movement between first and second positions by a co...

This invention involves methods and apparatus relating to the assembly and structure of a dot matrix print head. The invention includes a single unit, coil assembly of a bobbin, coil, and clapper which can be removeably placed as a unit among fixed pole pieces and yoke members in the print head. The print head also includes a supporting arrangement for the coil assemblies which automatically aligns the clapper of each coil assembly with the impact end of one of the print wires during the assembl...

A transport system for a dot matrix printing mechanism including an improved overall design for the transport system and improved designs for individual elements of the system and combinations of elements. The overall design of the present invention uses snap fits extensively throughout for ease of assembly and disassembly, integrates many previously separate parts into one-piece members, employs common part designs wherever possible, and uses single parts to perform multiple functions wherever ...