Automatic cutter change type shaving machine

Metal working – Plural diverse manufacturing apparatus including means for... – Common reciprocating support for spaced tools

Patent

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Details

409231, B23Q 3157

Patent

active

049426575

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

This invention relates to an automatic cutter change type shaving machine enabled to automatically change a shaving cutter for a shaving machine used to finish gears.


PRIOR ART

While almost all machine tools are currently equipped with an automatic tool changing mechanism, a shaving machine has not yet been equipped with such an automatic tool changer. This is considered to be for the following reasons: the shaving cutter is thin walled, small thickness for its diameter so that it is almost impossible to load it to the cutter head spindle by taper fitting, and that it is difficult to center so as to fit it to the spindle without tilt; the equipment to manufacture and regrind the cutter is of such construction that handles thin-walled cutters in accordance with the tradition from the development of the shaving machine to date; and the like.
A prior art technique for rapid change of a shaving cutter is disclosed in Japanese Patent Publication No. 33053/1983. According to this known art, the cutter head spindle is constructed to be supported by a sliding portion which is slidable along the spindle axis, and it is constructed so that a plurality of cutters are loaded to the spindle beforehand and only a cutter may be selected at a time and be brought to the machining position by sliding the sliding portion.
In the above known art, in which a cutter is changed by moving the spindle together with the cutter head sliding portion, since a comparatively long structural portion is moved, the number of cutters which can be changed by its movement is limited to two or a maximum of three pieces. Also it takes rather a long time to newly load two or three cutters on the spindle.
The object of the present invention is to provide a new shaving machine enabled to automatically change the cutter by providing the cutter itself with a construction suitable for the automatic change and mechanism to allow such a cutter to fit the spindle without tilt.


SUMMARY OF THE INVENTION

In order to accomplish the above object, the present invention provides an automatic cutter change type shaving machine comprising: a table supported by a supporting bed, a pair of head stocks on said table, a column vertically installed on said supporting bed, a cutter head which is lifted and lowered on said column by a driving motor, a rotary cutter for finishing gears which can be loaded to said cutter head, and a carriage which is allowed to come nearer to or go away from the cutter loaded to said cutter head along said cutter axis by means of a travel driving means in order to change the cutter in said cutter head by attaching or detaching it as required,
said cutter head comprising a spindle, a clamp bar and an advance and return driving means; the spindle being rotated by a drive, and comprising a cutter abutting step provided at a shortly retracted position from the end surface at one end of said spindle, a cutter loading portion having a projecting key on the side of the end, and a through hole extending on the spindle axis; the clamp bar being slidably mounted in said through hole, and including a pin supporting hole having an axis aligned with the spindle axis and extending from the end surface on said cutter loading portion, said clamp bar having a clamp member which is provided on said clamp bar wall enclosing said pin supporting hole and loosens or tightens in the radial direction of said pin supporting hole in accordance with the advance or return of said clamp bar; the advance and return driving means being mounted to said spindle at an end on the other side of said cutter loading portion to drive said clamp bar for advance and return,
said each cutter comprising: a fitting hole formed concentrically with said cutter, which hole opens on one end surface, is closed on the other end surface by a sealing wall of said cutter, has a keyway for receiving said key and can be fitted to said cutter loading portion; a locating end surface which abuts on said cutter locating step when loaded to said cutter loading portio

REFERENCES:
patent: 3925878 (1975-12-01), Kikuchi
patent: 4528743 (1985-07-01), Bleich
patent: 4641415 (1987-02-01), Charra
patent: 4780951 (1988-11-01), Beyer et al.

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