US1633741A - Machine for tightening the insulation applied on winding bars of electric machines and apparatus - Google Patents

Description

' 1,633,741 June 28, 1927. I E. HAEFELY v momma FOR TIGHTENLNG THE INSULATION APPLIED 0N WINDING BARS OF ELECTRIC MACHINES AND APPARATUS Filed March 1923 Patented June 28, 1927.

ENETED STATES PATENT OFFICE..,.

EMIL HAEFELY, OF BASEL, SWITZERLAND.

MACHINE FOR TIGHTENING'THE INSULATION APPLIED ON WINDING BARS OF ELECTRIC MACHINESAND APPARATUS.

Application file'd March 8, I923, Serial No.

This invention relates to an improved machine for tighteniin and smoothing layers of insulating material wound on spools and bars of electric machines and apparatus. It is well known that winding'bars of rectangular cross-section are covered with an insulating material wound on by means of a winding machine. In spite of tight drawing of the insulating material in such a machine, it is not always possible to avoid creases be ing formed and the loosening of the covering layers. It has therefore been suggested that the tightening and smoothing of the insulating layers of material wound on spool bars of electric machines and appara tus may be effected by means of smoothing bands running in opposite directions, which in conjunction with simultaneous heating of the article to be covered, bring about by their movement a tightening of the insulating material.

The invention is based on this well-known arrangement, but it assumes that the tightening of the insulating material can only be done perfectly if the latter can be moved round the sides of the insulated winding bar, that is to say, that the movement of the insulating materials is not impeded in any way by counter supports or the like. Moreover, it will not do in the case of long winding bars, to use correspondingly wide smoothing bands, as such bands cannot have the same tightening effect all over their width and these requirements have been taken into account by the fact that the smoothing bands are divided up in their width into narrow single bands, running as closely as possible side by side, and these are conducted over the broad side of any one winding bar, leaving the narrow sides of the same free in such a way that they effect a continuous movement of the insulating material around the winding bar. i

It is advantageous for the smoothing bands to pass over a hot plate, which is arranged behind them and forms a. rectilinear guide for them.

The drawing shows a way of carrying the invention into effect:

Figure 1 is a vertical section through the tightening and smoothing device proper;

Figures 2 and 3 show a front and side elevation of the entire arrangement, together with the driving mechanism.

On the upper part of the frame a, are two 623,814, and in Switzerland March 9, 1922. I

vmovable one 6 serves as a bearing for the with the endless transport rollers e, e,

The

smoothing band running over same.

.smoothing bands of each row he as close together alongside of each other as the transport rollers permit, and form in their working portion an even smoothing surface right across their entire width.

Between the two rows of smoothing bands, the piece of Work to be wound round in this case, say the notch bar 40 of'an electric machine winding spool, is inserted and placed in the notched part b of the bearers of the pair 6 The smoothing bands of both rows run with their working parts over the heatmg plates 9 (heated, for instance, electrically), which are carried between the respective bearers by holders h.

The smoothing bands of the two rows are driven in such a way that thesmoothing bands of one row in their working part run in the opposite direction to the working part of the smoothing bands of the other row. For this purpose, chain wheels 2' are attached to the shafts of the transport rollers 0 and e, on which an endless driving chain 70 runs, which is conducted round an intermediate tightening roller m. The driving chain is is propelledby an electric motor n.

The lower row of smoothing bands together with the corresponding heating plate serving as a guide for the smoothing bands, is pressed with adjustable pressure against the work piece a, which finds a support in thelower row of smoothing bands or in the corresponding heating plate serving as a guide for the same. For this purpose the pair of bearers b are fitted to the frame a by means of the slides 0 in a vertically adjustable manner, the said slides being movable upwardly by means of the lever 39, which is loaded by a weight. A cam shaft Q the camof which can be turned below the lever 12 allows the lowering ofthe slides 0 together with the pair of bearers b and the lower smoothing band row to unload the work piece at for the removal thereof.

The working of the device can be readily understood. The rows of driven smoothing bands move in their working parts in opposite directions on each side of the inserted Work piece a; and thus smooth the insulating material around the same so that the parts thereof are drawn tight in one direction on the underside and the insulation parts are drawn tight in the opposite direction on the upper side, so that in their action the two rows of smoothing bands supplement each other. The heat which they at the-same time convey from the heating plates to the layers of insulating material of the work piece facilitates or favours this smoothing and tightenin What I claim is A machine for tightening the insulation applied on Winding bars of rectangular cross-section for electric machines and apparatus, comprising two row of movable narrow smoothing bands, a movable carrier for one of said rows of smoothing bands, a driving device to cause the smoothing bands of the two rows to run in opposite directions, said two rows of bands constituting a free space between them throughout their operative length, and means to receive an insulated Winding bar within said space in such a position as to present their wide sides only to said smoothing bands While their narrow sides remain free, so that the smoothing bands when moving over the said wide sides of the winding bar produce a continuous smoothing and tightening of the insulating material round about the same.

In witness whereof I have hereunto signed my name this 16th day of February 1923.

- EMIL I-IAEFELY.

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