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Description: |
| James W. See - patent attorney
This invention pertains to improvements in centers or heads for use in connection with milling-machines and other machine-tools, such centers or heads being employed in holding the work while it is operated upon, and in dividing the work after the manner of a dividing-engine. Again, I may take a piece of work whose flutes require to be deeply cut and accurately divided. The accuracy of dividing mechanism involves a peculiar delicacy of structure, and also involves a careful protection from rough usage, while a substantial and strong dividing apparatus adapted for continued rough usage involves a freedom from delicacy. Such a piece of work as has been last mentioned would therefore be inaccurately done if the dividing mechanism were of heavy, substantial, and unprotected character, and slowly done if done with delicate dividing mechanism, and at the same time the delicate dividing mechanism will become injured during the heavy operation.In my improved apparatus I may do the heavy cutting of the flutes while the work is under the control of the primary index. This index, though substantial, may still, from frequent use or from indelicate original construction, be not accurate enough for the purpose in hand; but it will be sufficiently accurate for the preliminary heavy cutting, and will not become injured by the severe use. The secondary indexing mechanism can then be made to control the division while the finishing cuts are being made, thus ultimately yielding in heavy work the accuracy due to delicate indexing mechanism without impressing injurious strains upon that delicate mechanism.
I claim as my invention
1. In centers or heads for milling-machines or the like, the combination of a rotary spindle and its stock or support, a primary index plate secured to the spindle, a detent engaging said index-plate, and provided with means for locking it out of such engagement, a rotary shaft connected to such spindle by gearing, a secondary detent connected with said shaft, and as provided with means for locking it out of action, and a secondary index-plate adapted to be engaged by said secondary detent, substantially as and for the purpose set forth.
2. In centers or heads for milling-machines or the like, the combination of a rotary spindle, a stock or support for the same, a primary index-plate secured to said spindle, a primary detent fitted to engage such index plate, and provided with means for locking it out of such engagement, a worm-gear fast upon the spindle, a worm-shaft having a worm engaging such worm-gear, and provided with a secondary detent, a secondary index-plate arranged to be engaged by said secondary detent, a housing supporting said worm-shaft and secondary index-plate, and bolts engaging in slots or analogous devices for securing said housing to the spindle supported in a position corresponding to the engaged or disengaged position of the worm-gearing, substantially as and 40 for the purpose set forth.
3. In centers or heads for milling-machines or the like, the combination of a rotary spindle and its stock or support, primary index-plate B, secured to the spindle, and provided with facial index-notches, sliding primary detent F, disposed parallel to the spindle and provided with means for locking it out of engagement with its index-plate, a worm-gear fast upon the spindle, bracket-seat J, housing K, adjustably secured to the bracket-seat, worm L, engaging the worm-gear and having its shaft carried by said housing, crank O, secured to the worm-shaft and provided with secondary detent P, and secondary index-plate E, supported by the housing, substantially as and for the purpose set forth.
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