DE1063719B - Process for the production of grids for electrical discharge tubes and machine for carrying out the process - Google Patents

Description

The invention relates to a method for producing grids for electrical discharge tubes by winding a wire onto lattice bars, in each of which a lattice is wound, the wire separated and after an axial movement of the bars, the next grid is wound. This The process is sometimes referred to as winding without an intermediate wire. The invention further relates to a Machine for performing this procedure.

It has been found that such a method offers the possibility of being structurally simple feasible way to carry out other important machining operations on the same machine, in such a way that that a fully automatic machine for the production of finished products is created.

In the above-mentioned method of manufacturing grids for electric discharge tubes according to the invention wound a grid, while the bars of a crotch pliers grasped and axially are advanced at a predetermined pace (with predetermined paces); after winding the Grid, the bars are gripped by a second pair of pliers (stretching pliers) and then the grid is between stretched with the two pincers. Especially with the process in which the wire is separated, that is is wound without intermediate wires, time is available to go through an interplay of only two tongs can also be used to perform stretch machining on the machine.

In a further development of the method according to the invention, the bars are after Passing the stretching pliers cut off periodically to form individual lattices, which are then placed on a mandrel be held, deformed and finally stripped.

The invention also offers the possibility of stretching the grids warm. With this warm stretch However, extensive oxidation of the bars and the wire wound on them can occur.

This oxidation can be made up for by the fact that the fully wound grids during the φο Stretching and heated before cutting through a chamber to which a reducing gas is fed will be passed through.

The machine for carrying out the method is equipped in a known manner with a device for the supply of lattice bars, with a winding head for winding the lattice wire onto the bars and for periodically cutting and rewinding the wire on the bars, and is provided with a pair of pliers, to move the bars in the axial direction. According to the invention, the stretching pliers are arranged on the side facing away from the winding head, which grips the bars after the lattice has been wound and stretches them; then a process for the production of grids
for electric discharge tubes
and machine to carry out
of the procedure

Applicant:

Ν. V. Philips' Gloeilampenfabrieken,
Eindhoven (Netherlands)

Representative: Dr. rer. nat. P. Roßbach, patent attorney,
Hamburg 1, Mönckebergstr. 7th

Claimed priority:
Netherlands 24 April 1957

Gerard Moesker, Eindhoven (Netherlands),
has been named as the inventor

the step pliers is opened and moved back in the axial direction for the next winding process, after which the stretching pliers are opened to allow the wrapped mesh to pass through to further processing points.

In order to be able to carry out as many operations as possible on the same machine, is with the machine According to the invention, between the crimping pliers and the stretching pliers, a device for heating the bars present and a chamber between the stretching pliers and the parts for cutting off the rods arranged with a supply for reducing gas, which is traversed by the grid.

Using a schematic drawing of an embodiment of the lattice winding machine according to the Invention, the latter is explained in more detail.

Fig. 1 is a plan view of the main parts of the machine;

Fig. 2 is an enlarged view taken along arrow II of Fig. 1;

Figures 3 and 4 illustrate cutting;

Fig. 5 illustrates the shape of the grid.

In the engine box 1 , a winding head 2 is rotatably mounted around a guide for bars 3 and 4 , which are drawn off from the reel 5 and lie one above the other, as shown in FIG. 3.

The construction of the winding head 2 is known per se. It causes turns of the thin wire fed by the head to be wound around the bars

909 608/345

Claims (4)

are expediently in incisions in the rods, which are later driven to attach the wire to the rods. In a manner which is also known, the number of turns required for a grid is arranged in each case, after which the wire is cut off and rewound onto the bars at a distance from the arranged number of turns to produce the next grid. From the engine box 1 protrudes a spindle 6 on which sits a cam disk 7 which, through the intermediary of a roller 8 and an arm 9, controls a slide 10 on which a pair of pliers 11 with jaws 11a and 116 is arranged, which are periodically opened and closed can be. These pliers 11 are referred to as the step pliers. It grips the rods 3, 4 and communicates a longitudinal movement to them from the movement of the carriage 10 and the cam 7 such that the wire windings receive the required constant or variable step. The slide 10 is displaceable in a guide 12 and can strike a stop 13. In the guide 12, another carriage 14 is displaceable, which carries a pair of pliers 15 with jaws 15 a and 15 b, which are also able to grip the rods 3 and 4. These pliers 15 are referred to as the stretching pliers. The carriage 14 can be moved by the arm 16 against the action of the spring 17. The arm 16 abuts against a stop 18. In the path of the rods 3 and 4 with the wire wound thereon, a known device, not shown, is located near the winding head 2 for severing wire ends, which after adhering to the rods after the wire has been severed, protruding beyond the rods. There is also a device in this path between the stretching pliers and the crotch pliers to temporarily pass current through the rods, whereby these rods are heated together with the wound wire. After the forceps 15, a chamber 19 is arranged in the path of the bars, which is equipped with a supply line for a reducing gas, for. B. mixed gas is equipped. The rods 3 and 4 with the windings are passed through this chamber, with oxidized areas which have arisen during the heating for hot stretching being subjected to a reduction. From the chamber 19, the rods 3 and 4 and the wire wound onto them are fed to a holder 20 on the left in FIG. 1, in which molded parts 21, 22, 23, 24 (see also FIGS. 2 and 5) are located, which are able to give the grid the desired shape (Fig. 5). This is done in cooperation with a mandrel 25, which is movable in the longitudinal direction, as indicated in the holder 39, with the z. B. with a rack 41 on the holder 39 cooperating gear 40 and with the driven by the shaft 42 tooth segment 43. The holder 20 rotates around the molded parts 21, 22, 23, 24 and controls them with cams 31, 32, 35 and 36 against the action of the springs 33, 34 (Fig. 2). Knives 44 and 45 are arranged between the holder 20 and the chamber 19 (FIGS. 1, 3 and 4), which separate the bars 3 and 4 between two adjacent rows of wire windings 46 and 47. The rods 3 and 4 are guided on the mandrel 25 and centered in the molded parts 21, 22 (FIG. 3). The knives 44 and 45 can be designed and arranged in such a way that the cutting points of the rods come to lie somewhat offset in the longitudinal direction, which is desirable for some applications of grids. The mandrel 25 works together with a stripping part 37. A discharge chute for grids supplied by the machine is designated by 38. The mode of operation of the machine is as follows: At the beginning of the winding of a grid, the slide is in the position according to FIG. 1. The tongs 11 are closed and move with the slide 10 to the left in FIG. 1 according to a predetermined step rule. The tong 15 is open. After the number of turns required for a grid has been laid, the carriage 10 strikes the stop or comes into its immediate vicinity. The pliers remain closed for a moment, and at the same time the pliers 15 close. These pliers 15, together with the slide 14, are then moved to the left in FIG. The bars are then stretched between the tongs 11 and 15, the carriage 10 resting against the stop 13. The tong 11 opens and the carriage 10 moves quickly to the right, after which the tong 11 is closed and the tong 15 is opened. The slide is then pulled against the stop 18 by the spring 17. The bars 3 and 4 move through the chamber 19 and are then cut off so that individual grids are formed. The grids are shaped (FIG. 5), which are then removed by the scraper part 37 from the mandrel 25 and carried away into the channel or the container 38. Patent claims: 1. A method for the production of grids for electrical discharge tubes by winding a wire on bars, in each of which a grid is wound, the wire is separated and after an axial advancement of the bars, the next grid is wound, characterized in that a grid is wound while the bars are grasped by stepping pliers and moved axially at a predetermined step (with predetermined steps) that the bars are grasped by a second pair of pliers (stretching pliers) after the lattice has been wound and that the grid is then stretched between the two pliers. 2. The method according to claim 1, characterized in that the bars after passing The stretching pliers are cut off periodically to form individual grids, which then open held in a mandrel, deformed and finally stripped off. 3. The method according to claim 2, characterized in that the finished-wound grid during heated before stretching and, before cutting, through a chamber to which a reducing gas is fed will be passed through. 4. Machine for performing the method according to claim 1, which is provided with a device for Infeed of lattice bars, with a winding head for winding the lattice wire onto the bars and arranged to periodically sever and rewind the wire onto the rods, as well is provided with pliers (step pliers) to move the bars in the axial direction, characterized in that the stretching