DE114209C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

Yes 114209 CLASS 49 «.

WILHELM LEWY in WARSAW. Machine for milling arrow wheels.

Patented in the German Empire on January 18, 1898.

With the present machine, the teeth of such gears are to be milled, which the greater durability because of so-called. Angular teeth are provided. By a low The machine can also be set up in such a way that it also has toothed racks Can provide angular teeth. Like similar milling machines, the machine can cut teeth Cut directly from the full material or the teeth of cast wheels and re-mill rods.

On the accompanying drawings is the

Fig. Ι a side view of an embodiment of the milling machine, while the

FIG. 2 is a section at right angles to FIG.

Fig. 3 shows part of the circumference of a wheel provided with angular teeth.

Fig. 4 shows part of a wheel in which one of the angular legs of the teeth concave and the other convex is curved.

That part of the present machine which is the actual subject of the invention forms, is in Fig. 1 below in the side view shown. For a correct understanding of how the machine works, it is necessary to also to describe those parts of it which are not the subject of the present Are patents.

α is the milling cutter which is driven by the two helical gears bc which are at right angles to one another. The revolution of the W ^T elle e is supported by the stepped disk d (FIG. 2) effected. A screw sitting on the shaft e / rotates a shaft z by means of the worm wheel g and the change gear / 2, which transmits its movement to a gear wheel ρ by means of the wheels k I _{7 of} two shafts m η and a reversing gear ο. The rotating motion of this wheel is transmitted through the wheels qr and a shaft s to a toothed gear t . The wheels ρ qr must be interchangeable so that the angle formed by the teeth of the wheel to be manufactured, etc., can be changed at will. The toothed gear t works together with a rack u constructed in the manner of a ladder with round teeth. Individual teeth of the rack are extended in the manner shown in Fig. 2, laterally across the width of the rod out and engage crank disks ν a, which are intended as gear wheels in the illustrated embodiment, the sämmtlich w engage in a longitudinally displaceable toothed rack. The purpose of the rack w is to prevent any slight mutual rotations of the cranks v, which could occur at certain times. It is absolutely necessary to design the cranks to form gears and, however, not to arrange the rod w. The geometric axes of rotation χ of the wheels ν must all lie in one and the same plane and the geometric axis of the wheel t must also be in this plane and parallel to the axes χ . The physical axes of rotation of the cranks ν y rest in a guided in the manner shown in Fig. 2 by way dovetail rack which bears with a lower claw-like part anticipatory {■ the dome rack tv. The rack y goes in the work of the machine

(2nd edition, issued on May 23rd igo2.i

Claims (2)

Longitudinally back and forth, thereby rotating the wheels a ^l b ^l c ¹ a wave d ^L, which means in their turn by means of the gears e ^1/1 g ^l h ^l two shafts I ¹ Ic ¹ rotates, one of which by means of the latter its rotation a gear / ', a larger spur gear m ¹ , a shaft η ¹ and screw ο ¹ on the faceplate ρ ' on which the wheel q ^{[to be provided with angular teeth] is} attached. The machine operates in the following manner: (Fig. 2), when the stepped disc d (Fig. 2) rotates, moves the support s ^l on the carriage f ¹ along, then the router a DAF by to edit part of the wheel q ¹ moves through it and either creates completely new tooth gaps or mills existing ones. At the same time, however, since the milling cutter is coupled to it in a force-transmitting manner by the gear and shaft arrangement described, this wheel is rotated very slowly, so that the milling cutter actually moves in an oblique direction on the circumference of the wheel, i.e. a helical groove in milled in the same. The characteristic of the present machine is that the wheel to be interrogated, while the milling cutter continues to move continuously in the same direction, initially rotates in one direction, but later in the opposite direction, so that the resulting tooth gaps do not continuously rotate from one wheel side to the other others run over, but turn in the middle, the width of the wheel, so that angular grooves corresponding to the desired angular teeth are created. The actual subject of the invention is formed by the mechanism consisting of the gear t, the ladder-shaped rack κ, the cranks ν and the rack y , which brings about the forward and backward rotation of the gear to be machined, which is necessary to achieve the angular shape of the teeth. This mechanism itself now works in such a way that the gear wheel t rolls in the ladder-shaped rack u until it has reached the end of the same. Since the connection of the rack u with the rack ^ is only effected by the cranks or crank disks ν , the radius of which is equal to the pitch circle radius of the gear wheel t , and these cranks, depending on the direction of movement of the two racks u and y, either vertically upwards or vertically downwards are turned, the rack, as soon as it is pushed forward by the gear ρ , because of the tendency of the cranks to rotate, is firmly pressed into the wheel t and thereby prevents any further rotation of the cranks ν. By sachsemäfse detailed construction and execution, it is possible to keep the angle by which the cranks rotate from their vertical position under the tension exerted on the rod 11 , practically zero. Since the cranks are completely prevented from rotating because the round teeth of the rod u are firmly inserted in the wheel t , as long as the wheel t has not reached the end of the rack u , the cranks must allow the straight movement of the rod Following w, also take the rack y with you. When the toothed wheel t has reached the end of the rack u , the latter (11) loses the support of the wheel t and can now, following the pressure exerted by the wheel t on its last tooth, move from the upper layer to the lower one, for example Can be brought into position by the cranks v, which are now. are no longer prevented from rotating by anything, is pivoted around parallel to itself, so to speak. The time of this pivoting of the rack u from the upper to the lower position BEZW. conversely, always coincides with the point in time at which the gear to be machined BEZW. the rack to be machined must reverse the direction of movement to achieve the angular shape of the teeth. As soon as the rack u has been swiveled around by its cranks, the gear wheel i continues to move in the same direction (ti) without having changed its direction of rotation, until the milling cutter has gone over the entire width of the workpiece to be machined (wheel or rack). After the machine has stopped, the workpiece is turned so much that the milling cutter can start cutting again. To u prevent during Herumschwenkens the rack, the cranks DAF ν for example due to wear of the pivot pins move out slightly from their parallel position, the cranks ν formed as gears which w by the Kippzahnstange to exactly simultaneous movement are compelled. A device can be connected to the present machine, which makes it possible to to move the shaft or faceplate on which the wheel to be machined is clamped in such a way that the generated ones Angular teeth are concave in one leg and convexly curved in the other. The Fig. 4 shows such a wheel. Godfather nt-A ν Proverbs: i. Machine for milling herringbone wheels, characterized in that a toothed rack (y) which rotates the workpiece to be machined by means of wheels If a toothed wheel ft ) rotating in a constant direction of rotation at the same time as the milling cutter (a) is moved lengthways alternately in one or the other direction, this toothed wheel ft) is alternately positioned on the upper and lower side of a ladder-shaped rack fu ) rolls, the force-transmitting connection of the two rods (y and u) by means of cranks fv) which are rotatably mounted on the rod fy) in the plane of the axis of the toothed wheel ft) and connected to the rod fu) at their crank pins, which by the engagement the rack fu) in the gear ft) at right angles to the pushing direction of the rods fu and y) and are rotated at the transition of each end tooth of the rod fu) over the wheel ft) with parallel displacement of the rod fu) by half a circle. 2. An embodiment of the under i. claimed machine, characterized in that the cranks fv) are designed as toothed wheels and for the purpose of exactly simultaneous actuation by a common - same rack fw) are connected to each other. For this purpose ι sheet of drawings.