Vertical tool head for headstock of horizontal drilling-milling machines

#The present invention relates to a new and improved construction of a vertical tool head for the headstock of a horizontal drilling-milling machine, which vertical tool head is of the type carried by a support arm disposed above and displaceable substantially parallel to a horizontal tool spindle and can be clamped in a work position at a headstock projection and drivable by the horizontal tool spindle which is mounted at the headstock projection.

#There are already known to the art headstocks of larger size horizontal drilling-milling machines equipped with a support arm, at the front end of which there can be mounted, depending upon requirements, different types of tool heads driven by the horizontal tool spindle, in order to make more universal the employment of the machine. When working with the horizontal tool spindle the tool heads are dismantled. The chucking and releasing of the tools at the tool heads is carried out manually. There is not possible any coordinated automatic mode of operation of the horizontal tool spindle and the tool heads, especially when working with a tool changer.

#The headstocks of larger plate-drilling-milling devices are sometimes equipped with a lower arm displaceable parallel to the horizontal tool spindle, at the front end of which there is non-detachably mounted an angular milling head which can be rotated through 360.degree.. Its milling spindle is driven by spindle gearing located at the rear end of the lower arm and the lower arm can carry out, by means of a feed drive, milling operations in the direction of the horizontal tool spindle with random angular positions of the angular milling head. Due to the arrangement of the lower arm beneath the headstock the lowest position of the headstock is limited and in the uppermost headstock position the milling spindle does not reach the upper working region of the horizontal tool spindle. The chucking and release of the tools used in the angular milling head only can be manually carried out because of constructional and spatial reasons governed by the work conditions. There is not possible any coordinated automatic mode of operation of the horizontal tool spindle and the milling spindle, especially in conjunction with a tool changer. Due to the special drive required for the milling spindle and owing to the lower arm-feed drive there is a considerably greater structural expenditure, limiting the use of the equipment to large plate drilling-milling devices.

#The invention will be better understood and objects other than those set forth above, will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:

#FIG. 1 is a partially perspective front view of a horizontal drilling-milling machine having a vertical tool head shown in the park position;

#FIG. 2 is a partial front view, similar to the showing of FIG. 1, illustrating the vertical tool head in the work or machining position;

#Describing now the drawings, the illustrated exemplary embodiment of horizontal drilling-milling machine comprises a rotatable workpiece table 3 which is displaceable upon a table bed 4 transversely with respect to a horizontal tool spindle 2. At right angles to the table bed 4 there is guided at the stand bed 5 a machine stand or column 6 in the direction of the horizontal tool spindle 2 which is mounted in a headstock 1. The headstock 1 is vertically displaceable in an opening 1a of the frame-shaped machine stand 6. A headstock projection or overhang 16 of the headstock 1 has a quadratic or square cross-section and a square or quadratic headstock chucking surface 15 for chucking or clamping a vertical tool head 10. Protruding from the headstock chucking or clamping surface 15 is the horizontal tool spindle 2 in order to provide for good accessibility to the workpiece.

#The headstock projection 16 and the vertical tool head 10 essentially have the same outer shape and in the work or machining position of the vertical tool head 10, illustrated in FIGS. 2 and 4, the headstock projection 16 and the tool head projection 21 likewise having a quadratic cross-section flushly contact one another at their clamping or chucking surfaces 15 and 22. In the park position of the vertical tool head 10, illustrated in FIGS. 1 and 3, its front face 14 which is parallel to the tool head clamping or chucking surface 22 is located together with the headstock clamping or chucking surface 15 in a vertical plane and at the tool receiver 17b of the vertical tool spindle 17 there is clamped a protective cap 80 by means of the tool chuck device 17a.

#At the region of the tool head projection 21 the vertical tool spindle 17 is snugly mounted behind the front face 14 in such a manner that both in the work or machining position as well as also in the park position it is located in a vertical plane with the horizontal tool spindle 2, and the tool chuck device 17a which, as is conventional is arranged at its end, is located in the offset narrow portion 26. A support arm or support means in the form for instance of pivotal thrust sleeve or bushing 11 serves to transfer the vertical tool head 10 from the park position into the work position, and pivotal thrust sleeve 11 is flanged by means of screws 23 (FIG. 4) or equivalent structure at the rear face 20 of the narrow portion 26 and is pivotably and displaceably mounted at the headstock 1 in the guide bushings or sleeves 27, 28 above the horizontal tool spindle 2. FIG. 3 illustrates that a vertical cover plate 29 is arranged at the headstock 1, at which there comes to bear the tool head-clamping surface 22 in the park position. As a result, when operating with the horizontal tool spindle 2 there are encapsulated in a dustproof manner, apart from the tool head-clamping surface 22, the entrainment grooves 18a of the bevel gear 18 mounted in the tool head projection 21 for the drive of the vertical tool spindle 17 as well as the hereinafter to be described ball clamping or chucking heads 50 protruding from the vertical tool head-clamping surface 22.