US3926078A — Numerical control lathe of sliding-headstock type

Claim 1

Independent Claim 330 words

A numerical control lathe of the sliding-headstock type comprising: an elongated bed; a headstock reciprocatingly disposed on said bed for travel in a longitudinal direction thereof, said headstock being advanced by numeric control; a driving spindle rotatably supported on said headstock, said driving spindle having a collet chuck for clamping a workpiece and a throughgoing bore through which said workpiece is fed; a spindle head on said driving spindle; means rotatably supporting said driving spindle on said headstock close to said spindle head; a guide bush situated coaxially with the axis of said driving spindle so as to rotatably support the workpiece; a pedestal for supporting said guide bush and detachably mounted on said bed; a first turret toolpost having a slide block driven in numeric control, said slide block being movable in a direction perpendicular to the axis of said driving spindle; another turret toolpost having a slide block driven by an oil pressure cylinder, this slide block being movable in a direction parallel to the axis of said driving spindle; a turret head mounted on said first turret toolpost, the slide block of the latter being movable in a direction perpendicular to the axis of said driving spindle, said turret head being rotatably supported on said slide block alongside said guide bush with the rotation axis of said turret head being parallel to the axis of said driving spindle; a portal housing block spanned over said driving spindle and mounted on said bed; a guide rail located on said housing block in a direction perpendicular to the axis of said driving spindle, said slide block of said first turret toolpost being movable along said guide rail; an oil pressure actuator for pushing said slide block toward said driving spindle; and a device for adjusting progressive advance of tools attached to said turret head for exactly guiding the respective ends of the tools to a cutting position defined near said guide bush even where the tools have different lengths.

Claim 2

Dependent Claim 330 words

A numerical control lathe of the sliding-headstock type comprising: an elongated bed; a headstock reciprocatingly disposed on said bed for travel in a longitudinal direction thereof, said headstock being advanced by numeric control; a driving spindle rotatably supported on said headstock, said driving spindle having a collet chuck for clamping a workpiece and a throughgoing bore through which said workpiece is fed; a spindle head on said driving spindle; means rotatably supporting said driving spindle on said headstock close to said spindle head; a guide bush situated coaxially with the axis of said driving spindle so as to rotatably support the workpiece; a pedestal for supporting said guide bush and detachably mounted on said bed; a first turret toolpost having a slide block driven in numeric control, said slide block being movable in a direction perpendicular to the axis of said driving spindle; another turret toolpost having a slide block driven by an oil pressure cylinder, this slide block being movable in a direction parallel to the axis of said driving spindle; a turret head mounted on said first turret toolpost, the slide block of the latter being movable in a direction perpendicular to the axis of said driving spindle, said turret head being rotatably supported on said slide block alongside said guide bush with the rotation axis of said turret head being parallel to the axis of said driving spindle; a portal housing block spanned over said driving spindle and mounted on said bed; a guide rail located on said housing block in a direction perpendicular to the axis of said driving spindle, said slide block of said first turret toolpost being movable along said guide rail; an oil pressure actuator for pushing said slide block toward said driving spindle; and a device for adjusting progressive advance of tools attached to said turret head for exactly guiding the respective ends of the tools to a cutting position defined near said guide bush even where the tools have different lengths.

Claim 3

Dependent Claim 114 words

A numerical control lathe of the sliding-headstock type as defined in claim 1 in which said adjusting device comprises: a thread piece attached to the bottom of said slide block; an adjustable screw threaded to said piece; an indexing shaft journaled to bearings attached to said housing block; an indexing disc fixed to the front end of said shaft; and a plurality of stop rods mounted on said disc and having different lengths less than the number of tool-attaching portions of said turret head, said stop rods selectively facing the end of said screw, said indexing shaft and disc being set at a selected angle by an indexing control of a numeric control system.

Claim 4

Dependent Claim 42 words

A numerical control lathe of the sliding-headstock type as defined in claim 1 in which there is further providEd a synchronous control device for obtaining the synchronous travel of the headstock and horizontal slide block with the workpiece being relieved from load.

Claim 5

Dependent Claim 118 words

A numerical control lathe of the sliding-headstock type as defined in claim 3 in which the synchronous control device comprises a piston-cylinder assembly having a hollow cylinder, the end of the cylinder being connected with the headstock, and a piston slidably inserted into the cylinder and pivotally connected with the slide block, a lock pin with a piston slidably inserted into a chamber disposed on the side of the cylinder and means for alternately supplying the pressure oil to the chamber so that the supply of the pressure oil for urging the lock pin toward the piston causes the lock of the piston and cylinder and results in the synchronous movement of the head stock and slide block.

Claim 6

Dependent Claim 93 words

A numerical control lathe of the sliding-headstock type as defined in claim 3 in which the synchronous control device comprises two piston-cylinder assemblies having mutually communicating paths, the former being adapted for travelling of the headstock, and the latter for travelling of the slide block, so that the pistons of the assemblies are synchronously moved by flowings of the respective paths as the releasing of the oil contained in the cylinders of the assemblies is cut from the oil supply, whereby the synchronous travel of the headstock and slide block is exactly maintained.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-12-15	1979-06-16	1979-12-16	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-12-15	1983-06-16	1983-12-16	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-12-15	1987-06-16	1987-12-16	$7700.00	Window Closed / Lapsed

Numerical control lathe of sliding-headstock type

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag