DE442435C - drilling machine - Google Patents

Description

GERMAN EMPIRE

ISSUED APRIL 1, 1927

REIC HS PATENT OFFICE

PATENT LETTERING

Vr 442435 CLASS 49 a GROUP 55

(A 46323 Il49a)

Alexanderwerk A. von der Nahmer Akt-Ges. in Remscheid.

Drilling machine. Patented in the German Empire !! from November 6, 1925.

The present invention relates to a drilling machine. This machine is in accordance with the invention Provided with a device that activates a special gear when the working feed of the drill is switched on sets that hits the drill directly on the workpiece, so that it is without Loss of time led to the workpiece and then the usual in its further movement automatic feed device

Claims (1)

processing ". There are already special drilling machines known, in which the approach of the drill to the workpiece with faster feed than with the working S advance takes place; these devices, in which the feed is controlled by indexing drums, With control cams o. The like. Happen, however, have the disadvantage that the introduction of the Bohrer does not take place suddenly and suddenly, but still takes a certain amount of time claimed. The subject matter of the present invention is now particularly characterized in that that the drill is suddenly applied to the workpiece, with practically no loss of time will. An exemplary embodiment of the subject matter of the invention is shown in the drawing. Fig. Ι shows a side view of the drill, in which the drill is in the rest position. Fig. 2 shows the same view with the drill set on the workpiece. The drilling spindle is driven in a known manner by the motor & through two belts / and V. It rotates in a likewise known manner in the sleeve set, which is equipped with a toothing. The gear wheel c engages in the toothing of the Huj.se d , which is rotated by a toothed chain ^ from the gearbox / connected to the motor b. The lever g ", which carries a roller A, is connected to the gear wheel c . When the drill is in its rest position, the lever g rests on the leg o ^{1 of} the lever 0, which is guided in the slider o ^{2. The lever o sticks out} the intermediate member κ is connected to the lever m , which in turn is connected by the member « ¹ to the lever k mounted at k ^1. The latter is articulated by the member k ^a to the angle lever /, the shorter end of which is connected to the displaceable part the clutch ^ attacks. If the drill feed is to be engaged, the clutch ρ is engaged by a downward movement of the lever. The downward movement takes place here in the illustrated embodiment by the This is the effect of the spring r which, after releasing the handle q, which is usually held by the hand or the knee of the worker, pulls the lever /: downwards. The lever linkage I, k, m and ο is now set so that the rod ο is raised immediately when the lever k is lowered, namely before the clutch is engaged. This also raises the lever g ·, rotates the gearwheel and snaps the drilling spindle α downward, namely before the advance of the drill, which is mediated by the gear unit and the toothed chain, can come into effect. When the drill feed is engaged, the drill bit immediately suddenly hits the workpiece, and the slower feed required for drilling starts immediately when the drill hits the workpiece. As the drill slowly descends into the workpiece, the lever g is raised further by the gear wheel. The RoIIeA comes into the path of the drive belt i, which is now tensioned by the lever moving upwards. The conditions are set up in such a way that the upward movement of the lever g is opposed to the greatest resistance at the moment when the drill has reached its lowest working position and has completed its drilling work. If the resistance that the lever g encounters on its upward movement inhibits the movement of the lever g as well as the gear drive c and the drill ζ , the friction clutch /? Which is installed between the motor & and the gearbox / can the power no longer transmitted, so it must grind and interrupt the power transmission to the feed. The lever g is now thrown back by the tension of the belt / made during the downward movement, so that the gear wheel c rotates and the sleeve set as well as the drilling spindle and the drill bit ζ are returned to their initial position. It is necessary here that the worker moves the rod o down again by lifting the lever q against the action of the Eederr so that the lever can swing back into its lowest position as shown in Fig. 1. Ρλ τ κ ν τ λ jm S i> κ υ c u: Drilling machine with automatically driven drill, characterized in that the drilling spindle [a, d) is connected by a gear (lever linkage g, o, m, k, I) with the engagement device (ρ) for the feed so that this gear during Engaging the feed drive of the drilling machine, the rapid feed of the drill (z) is effected until it reaches the workpiece. Here are sheets of drawings.