A combination of a multiple spindle head and means for attaching the spindle head to a quill having a rotational shaft inside the quill, comprising:
- (A) a base member including
- (i) a cylindrical portion having a vertical slit,
- (ii) a base flange at a lower end of said cylindrical portion and having a plurality of elongated first bolt holes, at least one positioning hole, and a first positioning recess located at an inner edge thereof, each first bolt hole having a large diameter portion at one end thereof and extending circumferentially in the base flange, and
- (iii) a ring member having fastening means for tightening, said cylindrical portion being located outside the quill so that when said fastening means of the ring member is operated, said cylindrical portion is tightened to thereby firmly connect the base member to the quill,
- (B) an attachment member connected to said base member including
- (i) a cylindrical attachment body having first and second positioning projections extending upwardly and downwardly therefrom respectively, said first positioning projection being engaged with said first positioning recess in said base flange to vertically align said base member and attachment member when they are connected together,
- (ii) an attachment flange outside said body and including a lower face, a plurality of bolts with nuts extending upwardly from the attachment flange for insertion together with the nuts through the large diameter portions of the first bolt holes in the base flange, an annular engaging recess on the lower face of the attachment flange and having a plurality of step portions extending therefrom into said attachment body, a plurality of second bolt holes, and at least one positioning depression,
- (iii) driving means located in the center of said attachment body and having at least one bearing and a driving gear supported by said bearing for rotation, and
- (iv) at least one positioning pin inserted through the positioning hole of said base member into the positioning depression of said attachment flange for angularly positioning said base member and said attachment member when the base member and the attachment member are tightened together by the nuts after said bolts with nuts are inserted through the large diameter portions of the bolt holes and the attachment member is turned,
- (C) a spindle head connected to said attachment member including
- (i) an upper spindle flange having a second positioning recess located inside the flange and a plurality of threaded holes, said second positioning recess being engaged with said second positioning projection of said attachment body to vertically align said attachment member and said spindle head when they are connected together,
- (ii) a lower spindle flange having a plurality of bores for attaching a spindle holder thereto,
- (iii) a plurality of connecting bolts inserted through said second bolt holes of said attachment flange into said threaded holes of said upper spindle flange for connecting said spindle head and said attachment member, and
- (iv) a plurality of spindle assemblies each including an axle having an anchoring plate at one end and an intermediate gear rotationally situated on the axle, said anchoring plate being located in said annular engaging recess of said attachment flange and firmly engaged with said step portion when said spindle head is connected to said attachment member, and
- (D) an arbor situated between the driving gear and the rotational shaft, said arbor being easily engagable and disengagable with the driving gear and the rotational shaft,
- whereby said attachment member to which said spindle head is connected can be attached to and detached from said base member for easily changing said spindle head.