DE67518C - Centering wire holding and feeding device for lathes and similar machines - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The present invention consists in a new construction and arrangement of the supply, Centrir and holding device for the material to be processed.

In the screw cutting machines in use up to now, a rod is passed through the guided hollow spindle of the machine and at the front end of the same of gripping jaws which center and hold the rod when it is cut.

If a screw or another article is finished, it is cut off, whereupon the chuck jaw opens and the piece of wire to be processed by a certain length is pushed out through the jaw. Is the length of the item to be manufactured in With respect to the diameter of the same only small, so can with such an arrangement good work .being made; however, if the workpiece is slim, it will jump off the Cutting tools, so that such an arrangement is insufficient. Another evil lies in the fact that, when the workpiece is bent, the chuck jaws are the outer end pull it out of the center line while touching it. One can therefore only be complete process straight bars as others will not run exactly when, as mentioned, in the chuck jaws are clamped.

The purpose of the present invention is to remedy these evils; the new machine allows a workpiece of any length to be machined and straighten both ends the same in the central axis.

The enclosed drawings show a new kind of machine.

Fig. Ι is a vertical longitudinal section of the same,

Fig. 2 is a cross section in the direction of the line Xx of Fig. 1..

Fig. 3 is a corresponding section in the direction of line yy of the same figure.

4 is a front view of the spindle chuck with the cover plate removed.

At the head end of the hollow spindle A , the chuck B , which consists of a center piece C, radially sliding pre-setting jaws D and wedge ring E , is screwed on.

The steel shoes F , which are steered into the fork-shaped ends of the press jaws, which are moved radially by the axial advance of the ring E, adapt to the irregularities of the wire Z to be clamped and processed.

The inner end of the rod Z is held and clamped in the axis of rotation by a device G which is to be called "feed chuck" and which in the present embodiment of the machine is fixed on the mandrel of the lathe.

This device consists of a flanged sleeve H which is attached to the mandrel (or other suitable machine part) in the axial direction of the hollow spindle. A spindle is rotatably and axially movably arranged within the sleeve. The outer end of the spindle I is provided with a head J for storing the chuck H, the inner end with one or more circumferential grooves α α ¹ for adjustment by the resilient knob d . The button d is intended to prevent accidental axial movement of the spindle /, but to allow deliberate movement with a certain amount of force.

Claims (3)

In slots of the head J, the two gripping levers K are hinged, the backward-extending arms of which rest with noses e on a ring f. Springs g press the rear arms of the same onto the ring / and the front arms apart, so that the mouth formed by the jaws h embedded in them is opened. Each gripping jaw is provided with a bolt i with which it engages in a grommet arranged at the end of the associated lever. These jaws h are adjusted against each other by adjusting screws j and can be secured in the fixed position by clamping screws k '(Fig. Ι and 3). In front of the ring f, a second ring or neck / is arranged on the sleeve H, the diameter of which is smaller than that of the ring /; the edges of the ring f are bevelled near the ring / (Fig. 1), so that the tails of the levers K, which are rounded for this purpose, can easily slide from one ring to the other as soon as the spindle / and the one with it connected parts can be moved against the sleeve H. The device is used in the following way. First, the rod Z is passed through the hollow spindle A in such a way that its end protrudes through the front surface of the jaws. The spindle / with the parts connected to it must then be pulled outwards in relation to the sleeve, as indicated in Fig. 1 by dotted lines, so that the rounded ends or tails of the lever K rest on the smaller ring Z, which Bolt d engages in the groove a1 of the spindle and the jaws of the lever K are separated from each other or open. The gripping devices are then moved against the rod Z and the jaws h slide onto the end of the rod until they are held by the rod which comes into contact with the spindle /. The spindle is then pushed into the sleeve and the tails of the levers slide over the bevelled edge of the ring f, the jaws being pressed firmly against the rod Z so that they clamp the latter. During the time in which the levers K clamp the rod, the groove a of the spindle also slides under the resilient bolt d, which locks the spindle and secures it against unintentional longitudinal displacement. When this is done, the gripping devices and the mandrel or the other parts to which they are connected are simultaneously moved backwards and pull the rod Z with them. During these operations the rod remains free within the jaws on the hollow spindle; however, when a sufficient length of the rod is pulled through the spindle and jaws, the jaws of the latter are also tightened. The rod Z, - while it is held at both ends, can now be machined, or, if desired, the mandrel can be pulled further backwards so that the lever and jaws are free, and the rod can be machined while it is only going through the clamping jaws of the spindle is held. If the rod Z is machined while it is held by the jaws h, the latter rotate with the workpiece, while the spindle /, to which the levers K and associated parts are connected, rotates within the sleeve H. The gripping devices can, if desired, be placed on the end of the rod Z while the latter rotates. Advantageously, the spindle 1 is provided with a central bolt or projections against which the end of the rod Z must strike when the gripping devices are placed on the rods, instead of allowing the latter to strike directly against the spindle. As in the present embodiment the invention is applied to a center lathe, it can of course be applied to all other types of lathes or with other parts of such lathes or machines. Godfather ν t claims: 1. A centering wire holding and feeding device for lathes and similar machines with a hollow spindle that allows the workpiece to pass through by the arrangement of a gripping device, which the gripping jaws of the spindle is arranged opposite on a part of the machine which, with respect to the Gripping jaws of the spindle can be moved in the longitudinal direction. 2. A device of the type protected by claim 1, characterized in that that their gripping jaws rotate with the workpiece. 3. An embodiment of the device characterized in claims 1 and 2, consisting of a spindle 7 which can be displaced in the chuck H and which carries rotatable levers K in its head J , which on the one hand are equipped with jaws h that grip the workpiece and on the other hand with tails e are which, depending on the position of the spindle head against the the spindle chuck arranged rings f or Z put so that the jaws hold the end of the workpiece or. release.
A device of the. by claim ι. protected type, characterized in that a resilient bolt d mounted in the chuck H engages with its lower end in grooves α a ^l , the spindle /, so that the spindle α can only be moved in its longitudinal direction with the application of a certain force and against accidental shifts is secured.
A device by claim ι. protected species, characterized in that an inclined surface is arranged between the rings / and f , so that when the spindle is displaced, the levers K with their rounded tails e automatically move from the smaller ring to the larger one. For this purpose ι sheet of drawings.