US2136082A - Electrode feeding mechanism for arc lamps - Google Patents

Description

Nov. 8, 1938. w. K. KRIEG ET AL ELECTRODE FEEDING MECHANISM FOR ARC LAMPS Filed Jan. 22, 1938 2 Sheets-Sheet l Fig. 1

NOV. 8, 1938. w K KRlEG ET AL 2,136,082

ELECTRODE FEEDING MECHANISM FOR ARC LAMPS Filed Jan. 22, 1938 2 Sheets-Sheet 2 [/2 van ions.-

Patented Nov. 8, 1938 UNITED STATES ELECTRODE FEEDING MECHANISM FOR LAMPS a Walter Kurt Krieg and Ernst Scheller, Jena, Germany, Germany assignors to the llnn Carl Zelas, Jena,

Application January 22, 1938, Serial No. 186,376

In Germany Claims.

angle.

A mechanism of said kind is, owing to simple construction, very reliable and can be'comparatively small, so that the electrode head intercepts the light are to a comparatively small extent only. To ensure as reliable an electrode displacement as possible, the interior wheel surface ac- 4 tuating the electrode is conveniently provided with pins or teeth of hard material.

In a mechanism according to theinvention, various speeds can be obtained by providing that the inclination of the axis of rotation of the driving wheel withrespect to the electrode axis be varied. It is thus possible to control for instance the feeding speed according to different electrode materials. When the inclination of the two axes relative to each other is variable by means of an electromagnet controlled by the light-arc voltage or actuated by means of a thermostat, irregularities in the electrode material can be dealt with in the feed automatically.

The acompanying drawings illustrate a constructional example of the invention. Figure 1 shows in part-sectional view the entire mechanism; Figure 2 shows a section through line 2-4 A in Figure 1; Figure 3 is a partial diagram; Figure. 4 shows a section through line 4-4 in Figure 1;

Figure 5'shows a section through line 5-5 m Figure 1; and Figure 6 is the diagram of a single part.

In thisconstructional example, the electrode, designated a, is in a holder b. The electrode it passes through a central orifice in an annular wheel 0 into which protrude the points of steel screws 0 these points engaging the electrode a.

The wheel 0, which is mounted in a ball bearing 11 and rotatable about an axis A-A, has teeth 0 in mesh with a bevel wheel e. The wheel e is mounted in an arm I, which carries the ball bearing d. By means of a flexible shaft e and a pair of bevel wheels e e the wheel e is connected to the armature of an electromotor g. A rod 7!. extends into the arm 1 and is so fixed to same by a screw 11 that this arm is not displaceable in the direction of the axis of this rod but can, within certain limits. eifect rotations about this axis (of.

January 27. 193'! Figure 4). in. such a manner as to be displaceable along and rotatable about its axis. By means of an am i fixed to therod h and carrying a square rod i lying between two adjusting screws 1 and F in the arm I, the position oi. the rod It can be determined with respect to the arm I by slightly screwing back the one of the screws 1' and I and readjusting the other of these screws until the pm i is in contact with both screws. A spring 1', which acts'against the upper bearing of the rod h and against a collar it fast with this' rod, draws this rod downward. Against the lower side of the collar h lies the one end of a fork k rotatable about a pin k the other end of this fork being provided with a key k. Below this key It is a stop k resting on a support It on which the fork is is mounted. On the lower end of the rod h is fixed the double-armed armature l of an electromagnet l. The one end of the armature l is fast with a spring 1 endeavouring to press the other end of this armature on a stop 1 against the action of the electromagnet. This electromagnet is operative only when the contact of a thermostat m is closed, on which the luminous crater of the electrode a is imaged when this electrode assumes a definite position.

The above-described mechanism operates as follows:

For the introduction of the electrode into the holder b, the key It is to be pressed down, so that the driving wheel 0 is slightly raised against the action of the spring 7'. The hollow space in the The rod h is mountedon the holder 11' wheel c thus assumes a central position with respect to the axis B-B of the elctrode a, and the electrode can be inserted through this space. When the key k is then released (as is shown in the drawings), the driving wheel c assumes the position eccentric to the electrode axis, and the points of the upper screws 0 lie against the electrode. Energizing the motor 9 causes the driving wheel 0 to rotate and the upper screws 0 to carry the electrode along. On account of the inclination oi! the axis AA to the electrode axis 18-13 (of. Figure 3)., the screw points in engagement with the electrode push this electrode'forward, which is due to the electrode effecting a screw motion. The desired inclination of the axis A-A relative to the axis BI B and, consequently, the

desired feed of the electrode per rotation can be adjusted by means of the screws and I. Unforeseen changes in the consumption of the electrode are dealt with automatically by operation of the electromagnet I through the agency of the thermostat m.

, and thus imparting screw motions to said eIec- We claim: 1. In an arc lamp, a holder for an electrode, a feeding mechanism for said electrode, said feeding mechanism having an annular wheel provided with a central orifice through which the electrode passes and for feeding said electrode through said holder, said annular wheel being mounted 'on said holder and rotatable about an axis crossing the axis of said electrode at anacuteang'le and thus imparting screw motions to said'electrode when said annular wheel is rotated;

2. In an arc lamp, a holder for an electrode; a

, trode when said annular wheel is rotated.

3. In an arc lamp, a holder for an electrode, a feeding mechanism for said electrode, said feeding mechanism having an annular wheel provided with a central orifice through which the electrode passes and feeding said electrode.

through said holder, the axis of said annular wheel being eccentric to the axis of said electrode,

a bearing body for said annular wheel being mounted on said electrode holder and rotatable about an axis intersecting the axis of rotation ofsaid annular wheel at right angles, so that the rotation of said bearing body alters the angle of inclination at which the axis of rotation of said.

annular wheel.crosses the axis of said electrode, and means for rotating said bearing body rela.-

tively to said electrode holder.

4. In an arc lamp, a holder for an electrode, a

feeding mechanism for said electrode, said feed: ing mechanism having an annular wheel provided with a central orifice through which the electrode passes and feeding said-electrode through said holder, the axis of said annular wheel being eccentric to the axis of said electrode, a bearing body for said annular wheel being mounted on said electrode holder and rotatable about an axis intersecting the axis of rotation of said annular wheel at right angles, so that the rotation of said bearing body alters the angle of inclination at which'the axis of rotation of said' annular wheel crosses the axis of said electrode,'and an arc controlled means for rotating said bearing body relatively to saidelectrode holder.

5. In an-arc lamp, .a holder for an electrode, a I

feeding mechanism forsaid electrode, said feeding mechanism having an annular wheel provided with a central orifice through which the electrode passes and feeding said electrode through said holder, the axis of said annular wheel being .ec-

centric to theaxis of said electrode, a bearing body for said annular wheel being mounted on said electrode holder and rotatable about an axisinte'rsecting the axis of rotation-of said annular wheel at right angles, so'that the rotation of -said bearing body alters the-angle of inclination at which the axis-of rotation of said annular wheel crosses the axis of said electrode, an electromagnet for, rotating said bearing body relatively to" said electrode holder, and a thermostat positioned to receive light from the arc of the lamp and electrically connected tosaid: electromagnet for controlling same.

- WALTER KURT- mime. ERNST SCl-IELLER.

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