US2200425A - Machine for punching and coiling dynamo core ribbons - Google Patents

Description

. May 14 1940- E. KURSTEINR y2m11.425s

MAEHINE FOR PUNCHING AND COILING. DYNAMO CORE RIBBONS Filed Feb. 17, 1957 INVENTORk ERNST K wsu-EINER EN um? k7 ToRNEw/s Patented May 14, 1940 UNITED STATES titans rArENT oFFicE MACHINE FOR PUNCHING AND COILING DYNAMO CORE RIBBONS 10 Claims.

` The present invention relates to improvements in a machine for punching apertures in an iron ribbon and coiling the same for the manufacture of magnetic cores for dynamo machines.l In that type of dynamo machines where the stator and rotor comprise strip wound magnetic cores and Where at least the stator is provided with a Gra-mme winding, one has until now had great diiculties in the automatic production of such a core, and then especially to provide the apertures necessary to receive the windings and possible holding bolts simultaneously with the winding of the ribbon in a spiral to form the core.

The accuracy in the production which is necessary to-day requires that the slots wherein the electric windings are to be wound are so accurately formed that the precision which is required from the punching machine, in order to provide for smooth surfaces of these slots, must be extraordinarily great. The main difculty which arises when punching the slots primarily consists therein that the distance between the individual punchings in the iron ribbon must increase in relation to the increase in the core being coiled.

The ideal method for producing a core of this type would undoubtedly be to arrange the punching tool at the point of application of the ribbon to the core under coiling, i. e. to arrange the punching tool to work in the radial direction in the coiling means proper or, if it is desired to arrange the coils in the core in angular relation to the radius of the same at a certain angle to such radius. Even though such a construction may be thought possible for the production of a core, a number of difficulties would be introduced which would make the construction of such an automatic machine undesirable.

Until now it has therefore been the method used to arrange the coiling centre at a distance from the punching tool and provide means for increasing the distance between the coiling centre and the tool or to arrange a loc-p of iron material between the two, changing the dimensions of this loop asthe coiling and punching is going on. The simplest method to increase the distance between each aperture punched in the ribbon is undoubtedly to let the core itself,as it is being coiled, act as a feeding means for the ribbon. But this method introduces an error, due to the fact that the distance of the iron material always must be present between the point of application of the ribbon onto the core and the point of punching, and it has therefore been necessary-in addition to this simple method of feeding theiron material to the punch-to arrange means to increase the distance between the coiling centre and the punching point while the process yis going on, in order to provide straight slots to be produced inthe core.

The present invention relates to a machine of the last mentioned type, and one object of the invention is to construct the machine according to such principles that the possibility of irregularities for all practical purposes willl be eliminated, even though the punching does not take place at the theoretically best point, that is, the point of application of the ribbon onto the core. The machine according to the invention serves in this way toA coil the iron ribbon to form a ringshaped mechanical core for dynamos and for the purpose of punching the slots or holes in the core for electric windings, attachment bolts etc. of the above mentioned type, and the characteristic features of the machine are that the centre vof coiling and the point of punching are in'mechanical connection with each other and under the influence of means which during the process will move the two from each other inl relation-tothe speed of coiling and in a directionwhich will correspond to a radius through the centre of coiling and through the point of punching or in two diierent directions, one for each,` b'othof which are parallel with one and the same radius'throughthe point of coiling. According to this arrangement it is possible to place the punching so close to the point of coiling that no error which can be observed will be introduced, whereby the slots will be formed with smooth and even surfaces.

According to one preferred embodiment of the machine according to the invention, the punching means as a'whole is slidably arranged at an angle toa tangent to the point of application of the ribbon to the core and is combined with driving means,which at any time will move the punching means in relation to the increasing diameter of the co-re under the coiling process.

A further object of this invention is to construct the machine in such a way that the punching table at any time willl fall in line with the tangent through the point of application of the ribbon to the core, at the same time as means are provided serving to-force the said table with pressure against this point of application in order to serve as a grinding means to remove possible burrs or portions of Abent-up material at the punching points and' to serve the purpose of securing a tighty coiling of the ribbon onto the core.

Further objects will appear from the following description with reference to the drawing which diagrammatically illustrates one embodiment of the invention.

In the drawing,

Fig. l is a diagrammatically arranged perspective view of the machine according to the invention.

Fig. 2 is a diagram, illustrating the working process of the machine.

In Fig. 2, I represents the core under coiling, 2 the ceiling centre of the core, 3 the rst layer of the iron ribbon and 4 the last layer of the ribbon. 5 is the poin-t of application for the rst layer of iron ribbon and 6 the point of application for the last layer of iron ribbon; 1 and 8 denote respectively theiron ribbon as it is being fed to the rst and to the last layer on the core. The punching means is arranged in such a Way that the punching of the iron ribbon will take place at the point 9, and as the coiling continues, the point which has been punched may be said to follow the curve ID and will take its place on the core at the point II. As the coiling of the core continues, the point of punching may theoretically be said to move from 9 unto 9 in such a way that the point which is punched on the ribbon 8 will be placed onto the core at the point I2. As it will appear from the drawing, the apertures punched in the iron ribbon will as the ceiling takes place arrange themselves on each other after the line III2, which in the example described above will coincide with one radius to the centre of coiling 2. If it is desirable to arrange the slots formed by the individual apertures punched in the iron ribbon at an angle to the radius of the core, the punching means may be moved to the point 9 and under the punching process will follow the line to the point 9". The apertures punched in the ribbon will therefore respectively theoretically follow the lines IIJ" and respectively to the points II" and I2" and form a straight line at an angle to one radius from the centre of coiling.

In the drawing, Fig. 1, one can see the core I which is being coiled, and in which there are punched slots I4. The core is carried by a carrying member I5 which is attached to a shaft I6 which corresponds to the centre of coiling 2 in Fig. 2. The shaft I6 extends transversely over the machine and is at the other end provided with a ratchet wheel I1 with teeth I8 at such a distance from each other that this distance will determine the distance between the individual slots I4 in the core I.

The driving shaft I9 is driven from a belt wheel 20 and drives a gear 2I, 22, a vertical shaft 23, which in turn through gears 6I and 60 drives a wheel 24, to which the rod 25 is attached eccentrically with reference to the axis of the said wheel, which rod 25 at the other end is attached to an arm 2B which is pivotally mounted on the shaft I6 and provided with a dog 21 which engages with the teeth I8 on the ratchet wheel I1. By rotation of the shaft I9 this mechanism will provide for a stepwise feeding of the shaft I6 and the core I, which is being coiled.

Just below the core, the punching table 28 is arranged and carried by a frame member 29,

,l which is slidably arranged in the main frame 30 of the machine on slides 3I which are parallel to one radius of the centre of coiling 2. Frame 30 is open at its upper portion to permit table 28 to move downwardly. The frame 29 and the punching table 28 which are integral are displaced by a feeding screw 32 through the intermediary of a helical spring 34. Screw 32 is driven by a gear 35 in mesh with the gear 3G carried by the shaft 31 which at the other end is provided with a ratchet wheel 38 in engagement with a dog 39, carried by an arm 40. One end of arm 4I] is pivotally carried by the shaft 31 and the other end is connected to a rod 4I, which is eccentrically connected to a ratchet wheel 42, cooperating with a dog 43, carried on an arm 44. The outer end of arm 44 is actuated by means of a rod 45 connected to an eccentric 46, carried by the driving shaft I9. This mechanism will, when the driving shaft I9 is rotated through the different ratchet wheels and eccentrics, provide for a movement of the punching table 28 away from the center of coiling, with a speed which may be adjusted accurately to correspond to the increase in diameter of the core I during the process of coiling. The springs 34 will at any time provide for a resilient pressure of the punching table 28 against the core being coiled and at the same time these springs will compensate for possible irregularities in the material which is used for making the core.

The ribbon 41, of which the core is made, is fed into the coiling mechanism in a tangential direction to the same and over the punching table 28. A punching mechanism 48 is arranged in the frame member 29, slidable in the vertical direction in a slide 49, which is a part of the frame 29. At its upper end, the punch 48 is under the influence of one arm 50 of a bellcrank pivotally mounted in the frame 29 at the point 5I. The other arm 52 of said bell-crank, by means of a sliding shoe 53, is in contact with a straightedge 54 and is pressed against same by means of a spring 55. The straightedge 54 is slidably mounted on a guide 56 which is rigidly mounted on the frame 39 of the machine, and at the upper end of the straightedge 54 a hole 51 is arranged, in which an eccentric pin 58 acts. Pin 58 is fastened on the shaft 59 which through gears 6I is in mesh with a gear 60 on the shaft 23.

The punching mechanism operates so that the driving shaft I9 drives the shaft 23, whereby the driving power from the gear 69 is transmitted to the gear 6I and the eccentric pin 58 will move the straightedge 54 up and down, which movement will be transmitted through the arm 52 and 50 to the punching member 48. Each time the ratchet mechanism 21 has moved the ratchet wheel I1 and the core I a step forward, a punching process is completed in the ribbon 41. As the wheel I increases in diameter, the punching table 28 with its different connected parts as a complete assembly is moved down the slide 3l in such a way that the punching process at any time will take place in a line which corresponds to a tangent to the point of application of the ribbon to the points 5, 6.

In the foregoing description the present invention has been described with reference to a very simple diagrammatically illustrated embodiment of the machine for the making of dynamo cores. This machine illustrates only how it is possible to make the apertures which are necessary for forming the slots for the electric windings. Such a core must, however, also be provided with other apertures, as for instance holes for fastening bolts, etc., and a man skilled in the art will understand that by means of an analogous mechanism it will be possible to double or quadruple the number of punching operations.

and by means of suitable adjusting wheels Hit will be possible to provide for these punchings to take place in different predetermined periods in such-a way that for instance in addition to slots I4 in this core which is being coiled, it may also be provided With apertures in any desired number in the iron. A man skilled in the art will furthermore understand that by means of different adjustments ofthe points of the eccentrics for the fastening of the rods 25, 4| and by replacing the ratchet wheels l1 and 38, it is easily possible to adjust the machine according to the present invention for the making of Wheels of variable thickness of iron ribbon and with any desired number of apertures for rotation of the core.

I claim:

l. Improvement in machine for the manufacture of stripwound magnetic cores for dynamos from a continuous ribbon of iron material, comprising a rotatable coiling means for the ribbon, punching means'adapted to provide apertures in the ribbon, prior tothe coiling of same, the said coiling means and the said punching means being mo-veably mounted in relation to each other along a line in angular relation to the tangent at that point on the coiling means Where the ribbon is first in contact with the same in the coiling process, said punching means comprising a table, the plane of which alines with the tangent to the point of application of the ribbon to the core being coiled, and driving means in mechanical combination with the coiling means for moving the coiling means and the locking means away from each other at such a speed that the said table at all times will press the ribbon against the core at the pointof application.

2. Improvement in machine for the manufacture of stripwound magnetic cores for dynamosl from a continuous ribbon of iron material, comprising rotatable coiling means for the ribbon, punching means adapted to provide apertures in the ribbon, prior to the coiling of same, the said coiling means and the said punching means being moveably mounted in relation to each other along a line in angular relation to the tangent at that point on the coiling means Where the ribbon is rs-t in contact with the saine in the coiling process, said punching means comprising a table, the plane of which alines with the tangent at the point of application of the ribbon to the core being coiled, driving means in mechanical combination with the coiling means and adapted to move the coiling means and the punching means away from each other at such a speed that the said table at all times will press the ribbon against the core at the point of application, a spring in the said driving means, adapted to retain this pressure irrespectively of irregularities of the material in the ribbon being wound on to the said core.

3. In a machine for the manufacture of strip- Wound magnetic cores from a continuous ribbon of iron material, comprising rotatable coiling means for the ribbon, means for punching apertures in the ribbon prior to the coiling of the same, means supporting and guiding said punching means for movement radially of said coiling means along a line in angular relation to the tangent at that point on the coiling means where the ribbon is first in -contact with the same in the coiling process, a punching table associated With said punching means, the surface of said table engaging the circumference of the coil of ribbon and coinciding with said tangent, and means for resiliently urging said table into contact with the -coil of ribbon to enable said coil to displace said table and punching means along said guide as the diameter of the coil increases.

4. In a machine for the manufacture of strip- Wound magnetic cores from a continuous ribbon of iron material, comprising rotatable coiling means for the ribbon, means for punching apertures in the ribbon prior to the coiling of the same, means supporting and guiding said punching means for movement radially of said coiling means along a line in angular relation to the tangent at that point on the coiling means where the ribbon is rst in contact With the same in the coiling process, a punching table associated with said punching means, the surface of said table engaging the circumference of the coil of ribbon and coinciding with said tangent, means for resiliently urging said table into contact with the coil of ribbon to enable said coil to displace said table and punching means along said guide as the diameter of the coil increases', and means for displacing said resilient means along said guide away from the coiling means in timed relation with the rotation of said coiling means.

5. In a machine for the manufacture of stripwound magnetic cores from a continuous ribbon of iron material, comprising rotatable coiling means for the ribbon, a punching mechanism having a ribbon-supporting table, the surface of which is adapted to tangentially engage the coil at the point where the ribbon wound thereon rst contacts the same, a guide for mounting said punching device and table for sliding movement in a direction at an acute angle with the surface of said table, means for displacing said punching means along said guide as the diameter of the coil of ribbon increases, and resilient means for maintaining said table in tangential contact with said coil.

6. In a machine for the manufacture of stripwound magnetic cores from a continuous ribbon of iron material, comprising rotatable coiling means for the ribbon, a punching mechanism having a ribbon-supporting table, the surface of which is adapted to tangentially engage the coil at the point where the ribbon Wound thereon rst contacts the same, a guide for mounting said punching device and table for sliding movement in a direction at an acute angle With the surface of said table, a slide mounted on said guide, means driven in timed relation with said coiling means for displacing said slide away from said coiling means, and resilient means connecting said punching means and table to Asaid slide to resiliently urge said table into contact with said coil. i

'7. In a machine for the manufacture of strip-l wound magnetic cores from a continuous ribbon of iron material, comprising rotatable coiling means for the ribbon, a `punching mechanism having a ribbon-supporting table, the surface of which is adapted to tangentially engage the coil at the point where the ribbon Wound thereon rst contacts the same, a guide for mounting said punching device and table for sliding movement in a direction at an acute angle with the surface of said table, means for displacing said punching means along said guide as the diameter of the coil of ribbon increases, resilient means for maintaining said table in tangential contact with said coil, said punching means including a punching plunger mounted for movement perpendicularly to said table, a bell-crank having one arm in actuating engagement with said plunger, and a reciprocating member having a perpendicular surface parallel to said guide and engaging the other arm of said bell-crank to actuate the same.

8. In a machine for the manufacture of stripwound magnetic cores from a continuous ribbon of iron material, comprising rotatable coiling means for the ribbon, a punching mechanism having a ribbon-supporting table, the surface of which is adapted to tangentially engage the coil at the point Where the ribbon Wound thereon first contacts the same, a guide for mounting said punching device and table for sliding movement in a direction at an acute angle with the surface of said table, a slide mounted on said guide, means driven in timed relation with said coiling means for displacing said slide away from said coiling means, resilient means con necting said punching means and table to said slide tc resiliently urge said table into contact with said coil, said punching means including a punching plunger mounted for movement perpendicularly to said table, a bell-crank having one arm in actuating engagement With said plunger, and a reciprocating member having a perpendicular surface parallel to said guide and engaging the other arm of said bell-crank to actuate the same.

9. Improvement in machine for the manufacture of stripwound magnetic cores for dynamos from a continuous ribbon of iron material, comprising rotatable coiling means for the ribbon, punching means adapted to provide apertures in the ribbon, prior to the coiling of same, said coiling means and said punching means being movably mounted in relation to each other along a line in angular relation to the tangent at that point on the coiling means where the ribbon is first in contact with the same in the coiling process, said punching means including a ribbon-supporting table, the surface of which coincides with said tangent, and means for resiliently urging said table in contact with said coil.

10. Improvement in machine for the manufacture of stripwound magnetic cores for dynamos from a continuous ribbon of iron material, comprising rotatable coiling means for the ribbon, punching means adapted to provide apertures in the ribbon, prior to the coiling of same, said coiling means and said punching means being movably mounted in relation to each other along a line in angular relation to the tangent at that point on the coiling means where the ribbon is first in contact with the same in the coiling process, .said punching means being so located that the punching action takes place along a line which is parallel to a radius through the center of the coiling means, said punching means including a ribbon-supporting table, the surface of which coincides with said tangent, and means for resiliently urging said table in conta-ct with said coil.

ERNsT KRSTEINER.

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