US3019998A - Strip punching and winding machine - Google Patents

Description

Feb. 6, 1962 H. JAUN 3,019,998

STRIP PUNCHING AND WINDING MACHINE Filed Dec. 1, 1959 2 Sheets-Sheet 1 -//vv/v70 B HERMAN/V .44 UN i M ys.

Feb. 6, 1962 H. JAUN STRIP PUNCHING AND WINDING MACHINE 2 Sheets-Sheet 2 Filed Dec. 1, 1959 United States Patent 3,019,998 STRIP PUNCHING AND WlNDING MACHINE Hermann Jaun, Regensdorf, Switzerland, assignor to Elehtro-Motoren A.G., Zug, Switzerland Filed Dec. 1, 1959, Ser. No. 856,602 Claims priority, application Austria Dec. 15, 1%?! 4 Claims. (Cl. MIL-56.8)

I Especially for the manufacture of electric disk-armature motors, it is known to wind a strip, which is provided with recesses punched at distances apart, to a coil, on which the punched recesses form radially or spirally extending grooves. Into these grooves the electric windings of the motor can be laid.

Since the perimeter of the strip coil increases with every turn, the recesses in the strip must be punched at gradually increasing distances apart.

For solving this problem, it is known to produce grooved strip coils in such a way that a winding mandrel for the strip is each time, between two consecutive punchings, rotated thru a predetermined angle, the spaced relation between the punching place and the rotary axis of the winding mandrel being increased with growing diameter of the coil, and the strip kept in contact with a rectilinear guide which is tangential to the coil and touches an imaginary plane substantially intersecting the punching p a In machines of the type known heretofore, the punching unit is movable relative to the winding mandrel, the latter being stationarily disposed at least in the horizontal. This design, however, suffers from serious disadvantages, inasmuch as the punching unit is comparatively heavy and subjected to steadily changing forces which, in the long run, areliable to flatten the guides, thus deteriorating them and even rendering them unserviceable, unless particularly stout and hence expensive constructions are provided. it should be borne in mind that, depending on the thickness of the sheet and the size of the grooves, the punching pressure may range, say, from two to five tons.

The invention also relates to an arrangement for producing strip coils of the type, differing, however, from the prior art essentially by the fact that the punching place is stationarily located, and the winding mandrel rotatably supported on a slide guided along a rectilinear track, so that the rotary axis of the mandrel moves in a plane which substantially intersects the punching place and is inclined with respect to the surface of the guide rail, and that said slide is under the influence of a weight or of a spring tension adapted to draw the slide towards the punching place, keeping thereby the strip coil being formed in engagement with the guide rail.

The punching place being stationary, a usual punching unit may be used, having any desired precision and working speed. Hence, no correspondingly more expensive special constructions of the punching unit will be needed. The continually changing mechanical forces occurring when punching, are directly absorbed by the frame of the punching unit and need not be transmitted through guides for displacing the punching unit. Since the latter is in every case many times heavier than the winding mandrel and the strip coil being formed, it is thus preferable to have the punching unit arranged stationary and the mandrel displaceable. The means for rotating the winding mandrel may be of smaller dimensions than those for driving the punching unit; also for this reason it is preferable to have the Winding mandrel arranged displaceable, and the punching unit stationary. Therefore, through the arrangement according to the invention much more favorable kinematic conditions will result throughout than with the machines known heretofore. Hence a higher working speed is also possible.

According to another advantageous feature of the present invention, the guide rail, engaged by the strip coil, is adjust-ably arranged and inclined on the machine frame. Thus it becomes possible selectively to produce radially extending grooves or grooves running obliquely to the radial direction.

Further features of the invention will appear from the following description and claims, taken in conjunction with the accompanying drawing, with reference to which;

the invention is disclosed hereinafter example, and wherein:

FIG. 1 shows a front view of the most important parts of a form of embodiment of the arrangement in accordance with the invention;

purely by way of PEG. 2 represents a sectional view on the line II-I'l of PEG. 7 illustrates in a similar way the formation of a strip coil with obliquely extending grooves. The arrangement as shown in the drawing includes a punching machine as a main component, whose design is a known per se and need only be disclosed here quite rough- 1y. According to KG. 1, the machine comprises an underframe 10 with a carrier table 11. Mounted on the latter are upstanding tubular guides 12, each accommodating a vertically displaceable bar 13. The lower ends of the bars 13 are interconnected by a yoke 14 fixed thereto by means of nuts 15. A bearing portion of the yoke 14 has a connecting rod 17 which is rockably mounted thereon by means of a horizontal axle 16 and also arranged ona crankpin 18. The crankpin 13 is eccentrically connected to a shaft (not visible in the drawing) which, by means of bearing pieces 19, is rotatably located beneath the table ii and associated with a driving motor (not shown). Said shaft further carries a sprocket wheel 20 which is referred to later on.

The upper ends of the bars 13 are connected to each other by a yoke 22 fixed thereto by means of nuts 23. A threaded bore in the yoke 22 is engaged by a vertically running and axially displaceable screw-bolt 2-4. This screw-bolt carries at its lower end a holding device 25 for an exchangeable punching tool 26. A matrix as-' sociated with the tool 26 is exchangeably mounted on a holder 28 being in turn located on a block 29 supported and fixed on the table 11.

Disposed on the table 11 is a winding device which forms another main component part of thearrangement and is described hereafter. A substantially frame-like supporting member 31 is mounted on the table 11 by means of a bracket-like foot 32. Said member 31 comprises two parallel guide rails 33 (FIGS..2 and 3) be tween which, by means of rollers 35, a slide 34 is displaceably guided along a rectilinear track inclined at an angle to the horizontal.

Rotatably mounted on slide 34 is a shaft 36 whose axis extends horizontally and at right angles to the direction of movement of the slide. The front end of the shaft 36 carries a removable and exchangeable winding mandrel 37 which is firmly connected thereto by means of a screw 38. Mounted on the other end portion of the shaft 36 is a ratchet wheel 39 engaged by a pawl 40 under its force of gravity or by reason of the power of a spring (not shown), FIGURES 2, 3 and 4. The pawl 40 is fulcrumed on a bolt 41 at the end of a lever 42 loosely arranged on shaft 36 and hence swingable with respect to the latter. A nut 43 screwed onto the rear Patented Feb. 6, 1962 portion of a strip provided end of said shaft and a disk 44 prevent the lever 42 from sliding off the shaft 36, without the lever 42 having to be clamped. Moreover, by means of a bolt 45 (FIG. 4) the slide 34 has rockably mounted thereon a pawl 46 which, as biassed by a torsion spring (not shown), engages the ratchet wheel 39 to secure the same from turning contrary to the arrow R.

Through the joint pin 48, the lever 42 is pivoted to one end of a connecting rod 47, the other end of which engages a crankpin seated on a sliding or clamping piece 49 (FIG. 3). The latter engages a groove 51 with undercut flanks diametrically arranged on a wheel-disk 50, and is adjustable in the longitudinal direction of said groove for the purpose of altering the crank arm (FIG. 4). However, by means of a screw 52, said piece 49 can be secured in any set position, without the connectingrod 47 being thereby clamped on the crankpin. The wheel-disk 50 is seated fast on a shaft 53 which runs parallel to shaft 36 and is rotatably carried in slide 34, as shown in FIGS. 1 and 3.

A bevel-gear 55, integral with wheel-disk 50, meshes another bevel-gear 56 which, according to FIG. 3, rides on one end of a shaft 57 which extends parallel to the direction of movement of the slide 34 and is also rotatably supported thereon. Said shaft 57 possesses an extension 58 of non-circular cross-section. The extension 58 has for this purpose two longitudinal grooves 58a which are engaged by two so-called driving keys 59. Said extension can be moved axially across a sleeve 60 having said keys arranged thereon. The sleeve 60 can be turned, but is secured from axial displacement on the carrier member 31 and forms the hub of a bevel-gear 61. The latter meshes another bevel-gear 62 which is seated on a shaft 63 rotatably supported on the carrier 31, said shaft further carrying a sprocket wheel 64 as can be recognized from FIGS. 1 and 2. Through an open-link chain 65, the sprocket wheel 64 is coupled to the aforementioned sprocket wheel of the punching machine.

The slide 34 has anchored thereto one end of a flexible draw-member 68 which, for instance, is a wire-rope. The draw-member 68 runs over a guide roller 69 rotatably mounted on the machine frame and is at its other end loaded with a weight (not shown) which tends to move the slide 34 upwards and towards the punching tool 26.

Attached to the table 11 is a holding angle-iron 70 (FIGS. 1 and 2), having a guide rail 71 adjustably and fixably located thereon. The angle-iron 70 has to this effect an arcuately extending groove 72 which is engaged by a suitably curved spur 73 of the guide rail 71. The center of curvature of the groove 72 and of the spur 73 are substantially at the punching place of the punching machine, that is to say where the longitudinal median axis of the tool 26 intersects the upper bearing face of the matrix 27. A screw 74 permits of clamping the spur 73 in the set position on the angle-iron 70. At top the guide rail 71 has a rectilinear flat guide surface 75 on which the winding mandrel 37 or the coil being formed thereon can rest.

As the slide 34 is displaced along its track, the axis of the mandrel 37 moves in a plane 80 (FIGS. 6 and 7) which substantially intersects the longitudinal axis 81 of the tool 26 at the punching place. The guide surface 75 touches an imaginary plane 82 which also intersects substantially the longitudinal axis 81 of the tool 26 at the punching place and is inclined relative to the plane 80 at an angle 83 (FIG. 6) or 84 (FIG. 7).

With the arrangement described hereinbefore, strip coils with grooves can be made as follows:

A strip 85 consisting, say, of sheet-iron, is drawn from a stock roll (not shown), passed through between the tool 26 and matrix 27 of the punching machine and stuck with its first end into a slit 37a of the mandrel 37 for anchoring it (FIG, 1). Under the influence of the weight acting upon the draw-member 68, the mandrel 37 lies not far from the tool 26 at the guide surface of the guide rail 71. When the punching machine is set in operation, the crank 18 will cause the frame formed of the bars 13 and yokes 14, 22 to move vertically up and down by means of the connecting rod 17, the tool 26 following this movement. At each downward movement of the tool 26, it penetrates the strip 85 and punches a recess or aperture in it (FIG. 5).

Through chain 65, the sprocket wheel 20 drives the sprocket wheel 64 which in turn causes the shaft 57 journaled in slide 34 to rotate through the intermediary of the pair of bevel-gears 61, 62. This pair of bevel-gears 61, 62 drives the wheel-disk 50 which imparts to lever 42 a reciprocatory rocking movement by means of the connecting rod 47. In the rocking movement in one sense, the pawl 40 loosely slides over the teeth of the ratchet wheel 39 whereas in the rocking movement in the other sense the pawl 40 firmly engages the teeth of the ratchet wheel 39, thus displacing the latter angularly to a certain extent in the sense of the arrow R in FIG. 4. The number of revolutions of the wheel disk 50 corresponds to that of the crankpin 18 of the punching machine, and the movement of the lever 42 carrying the pawl 40 is synchronized with the movement of the tool 26, so that rotation of the ratchet wheel 39 and hence of the winding mandrel 37 takes place whenever the tool 26 is over the matrix 27 and strip 85. Rotation of the mandrel 37 each time causes a portion of the strip 85 to be wound thereon, so that the tool 26, in its next downward movement, makes a recess which is displaced a certain amount from the preceding one in the longitudinal direction of the strip 85.

If it is required that the recesses made in the strip coil 85 being produced should form, say, eight radially extending grooves 88 (FIG. 6), the sliding and clamping shoe 49 in the groove 51 of the wheel-disk 50 has to be set in such a way that each time, between two successive punchings, the mandrel 37 is rotated through a constant angle of 45 degrees or, in general terms, through an angle of where n=the number of grooves to be made in the strip coil. The winding mandrel and subsequently the strip coil under formation lie against the guide face 75 and perform a generating movement thereon upon rotation of the mandrel. With increasing diameter of the coil 87, it travels along the plane always farther away from the punching place. Because of the guide face 75 being inclined at an angle 83 relative to the plane 80, along which the axis of the mandrel 37 can move, for every momentary diameter of the coil 87 quite a definite position of the mandrel will result. In the described manner, the axis of the mandrel 37 is guided so that the angle 89 between the plane 89 and the strip portion running tangentially onto the coil 87 being formed, remains invariably the same and has the same size as the angle 83.

The place, on which the strip 85 runs onto the coil 87 has then always the same angular position relative to the axis of the winding mandrel 37. By properly selecting the angle of inclination 83, corresponding to the thickness of the strip 85, it will be achieved that in all turns of the coil the recesses 86 will come to lie exactly over each other and thus form radially extending grooves 88.

For making strip coils with a different number of grooves, all that need be done is to alter the setting of the sliding and clamping shoe 49 at the wheel-disk 50, but not the inclination of the guide face 75 as long as the thickness of the strip to be wound remains the same.

If the guide rail 71 is set in another way so that its guide face 75 with respect to the plane 80, along which the axis of the mandrel 37 is movable, makes an angle of inclination 84 (FIG. 7), which is greater or smaller with respect to the aforementioned angle 83, the recesses 86 made on the coil 87a will form grooves 88a which extend obliquely or spirally in one or the other direction in relation to the radial direction.

Also in this case, the angle 90 between the plane 80 and the strip portion running tangentially onto the coil being formed remains constant and of the same size as the angle 84, The angular position of the place, at which the strip 85 runs onto the coil 87a, also remains unchanged with respect to the axis of the mandrel 37.

t has to be mentioned that in all cases described hereinbefore, the guide face 75, with respect to the strip portion running tangentially to the mandrel 137 or to the coil 87 or 87a under formation, is inclined at an angle twice as great as the plane 80 along which the axis of the mandrel 37 can be moved. Per se it is, however, also possible to arrange the guide face 75 over the mandrel 37 so as to cause the strip portion 85 running onto the coil under formation to run along the guide surface. Then, however, there is the inconvenience of continuous friction between the strip and the guide surface.

The guide surface 75 need not necessarily be flat, but

could, for instance, also be curved cylindrically, provided the guide surface extends rectilinear and touches the imaginary plane 82 which intersects the axis of the tool 26 substantially at the punching place.

While the form of embodiment of the invention as herein disclosed, constitutes a preferred form, it is to be understood that some other changes may be made inthe arrangement, construction and combination of the various parts, and it is our intention to cover by our claims such changes as may reasonably be included within the scope thereof.

What I claim is:

1. A machine for producing strip coils with grooves formed by recesses punched into the strip being wound, comprising a stationary punching device, operating means for said punching device, a slide, a rectilinear track for guiding the slide, a coil winding device having a winding mandrel rotatably supported on the slide so that on moving the slide along the track the rotary axis of said mandrel moves in a plane which substantially intersects the punching place of said punching device, a mechanism actuated by said operating means for rotating said manpunching device, a rectilinear stationary guide rail having a guide surface extending in a second plane substantially intersecting the punching place at an acute angle with respect to the first-mentioned plane, and means for urging said slide along said track toward the punching place maintaining thereby the strip coil under formation on said winding mandrel in tangential contact with said guide surface of the guide rail. 7

2. A machine for producing strip coils with grooves formed by recesses punched into the strip being wound, according to claim 1, in which a machine frame is pro- ,vided, the guide rail being adjustable and fixed on the machine frame to permit altering the inclination of the guide surface with respect to the track for guiding the slide.

3. A machine for producing strip coils with grooves formed by recesses punched into the strip being wound, according to claim 1, in which a driving shaft is provided which rotates continuously and which extends parallel to the track on which the slide moves, the winding mandrel being operatively connected to the driving shaft which is in turn connected to the operating means of the punching device in any position of the slide.

4. A machine for producing strip coils with grooves formed by recesses punched into the strip being wound, according to claim 1, in which a continuously rotating driving shaft is provided which extends parallel to the track for guiding the slide, the winding mandrel being operatively connected to the driving shaft which is in turn connected to said operating means of the punching device in any position of the slide, and in which a rotatable sleeve is provided, the driving shaft being displaced together with the slide and is provided with an extension of non-circular cross section which, in any position of the said slide engages the rotatable sleeve which permits axial displacement of the extension and forms the hub of a wheel connected to a shaft of the punching device.

References Cited in the file of this patent UNITED STATES PATENTS 2,123,350 Anderson July 12, 1938

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