US3538800A

US3538800A - Automatic line for the lateral cutting out of a steel band into plates for magnetic circuits of transformers

Info

Publication number: US3538800A
Application number: US692209A
Authority: US
Inventors: Gennady Ivanovich Pshenichny; Yakov Zinovievich Checheljik; Mikhail Andreevich Afanastiev; Nikolai Nazarovich Khmara
Original assignee: Individual
Current assignee: Individual
Priority date: 1967-12-20
Filing date: 1967-12-20
Publication date: 1970-11-10
Anticipated expiration: 1987-11-10

Description

United States Patent inventors Gennady Ivanovich Pshenichny,

Ulitsa Kremlevskaya 27, kv. 8.; Yakov Zinovievich Checheljuk, Ulitsa Scherbakova 42, kv. 38: Mikhail Andreevich Afanasiev, Ulitsa Dnepropetrovskoe shosse 48 kv. l7; Nikolai Nazarovich Khmara, Ulitsa Kremlevskaya 33, kv. 7, all of Zaporozhie,

U.S.S.R. Appl. No. 692,209 Filed Dec. 20, 1967 Patented Nov. 10,1970

AUTOMATIC LINE FOR THE LATERAL CUTTING OUT OF A STEEL BAND INTO PLATES FOR MAGNETIC CIRCUITS OF TRANSFORMERS 2 Claims, 6 Drawing Figs.

Int. Cl B26d 5/20,

[50] Field of Search 83/34, 236, I 248, 240, 255, 276, 437, 336, 153, 160, 215-217, 556. 559, 94

[56] References Cited UNITED STATES PATENTS 2,730,233 1/1956 Coleman et a1 83/336X 2,920,521 1/1960 Abbenante 83/248X 3,085,458 4/1963 Platt et a1 83/240 FOREIGN PATENTS 976,855 11/1950 France 83/437 Primary Examiner-James M. Meister Attorney-Waters, Roditi; Schwartz and Nissen ABSTRACT: An apparatus for cutting a continuous steel band into platescomprises means for feeding the band to a first guillotine which transversely cuts the band to separate plates therefrom, after which the plates are transported to a second guillotine where sharp corners thereof are removed, the plates then being transported laterally by further electromagnets for discharge from the apparatus. 1

Pflented Nov. 10, 1970 Sheet Patented Nov. 10, 1970 Sheet Patented Nov. 10, 1970 Sheet Sheet 4 01'5 AUTOMATIC LINE FOR THE LATERAL CUTTING OUT OF A STEEL BAND INTO PLATES FOR MAGNETIC CIRCUITS OF TRANSFORMERS 7 The present invention relates to automatic lines for cutting a steel band into plates for magnetic circuits of transformers, and more particularly, to lines for cutting a steel band into plates with chamfered lateral edges in which sharp angles must be cut.

Known in the art are automatic lines for lateral cutting of a steel band into plates for magnetic circuits of transformers, in which said steel band is fed by a feeding mechanism from an unwinding device through a band pulling mechanism onto cutting stamps and therefrom onto turnable guillotine shears for cutting off plates. The cutoff plates are then fed onto a device for their removal off the line. h

A disadvantage of the known automaticlines is that they are large in size, complicated in design and not efficient enough. Furthermore, plates produced on these lines become deformed in the course of their production, which fact results in a marked deterioration of the electrotechnical characteristics of magnetic circuits.

It is an object of the present invention to reduce the size of the line. 7

Another object of the invention is to simplify the design of the automatic line.

Additionally, the present invention aims at providing an automatic line of a higher efficiency.

And, finally, it is an object of the invention to provide an automatic line which will preclude the deformation of plates in the course of their production and, consequently, will not result in deterioration of the electrotechnical characteristics of magnetic circuits.

In compliance with the aforementioned and other objects an automatic line has been provided for the lateral cutting of a steel band into plates for magnetic circuits of transformers, wherein a steel band is fed to guillotine shears for cutting plates therefrom, from an unwinding device through a band pulling mechanism, while a cutoff plate is fed by a plate feeding mechanism to a device for removing ready plates.

According to the invention, the automatic line is equipped with additional shears for cutting off sharp corners or angles in plates, which have an opening for passage through it of the plate feeding mechanism, said additional shears being arranged after the guillotine shears. The plate feeding mechanism is fashioned as an electromagnet moving reciprocatingly and electrically connected to the device for removing ready plates. The latter device is fashioned as a frame with grips traveling in a horizontal plane and perpendicular to the direction of the travel of the plate feeding mechanism.

It is feasible to arrange the device for removing ready plates as two groups of electromagnets interlocked electrically with an electromagnet of the plate feeding mechanism and working in succession.

The automatic line thus designed is nearly half as short as the known lines employed for the same purpose. The production efficiency of the line provided in accordance with the present invention is 50 percent higher than that of the known lines. The line according to the invention permits obtaining plates with higher electrotechnical characteristics.

The invention will be more apparent from a detailed description of an exemplary embodiment of the present invention, reference being had to the appended drawings, wherein:

FIG. 6 is a diagrammatic plan viewshowing the cutting of the plates from the band.

The automatic line comprises several mechanisms arranged in succession: an unwinding device I fitted with a split socket 2 on which a roll with a steel band (not shown in the drawing) is mounted, an electric drive 3 for imparting rotary motion to the unwinding device and a terminal switch 4 of the drive 3.

To pull the steel band in the course of a plate cutting operation, a pulling mechanism 5 is provided, which is followed by a band feeding mechanism 6. The latter is fitted with feeding carriages 7 actuated from a hydraulic drive 8 with a rack transmission. The travel of the carriages is restricted by rests Arranged after the band'feeding mechanism 6 are turnable guillotine shears I0 for cutting the band at a sharp angle to fonn plates. Additional guillotine shears 11 are provided after the shears 10 for cutting sharp corners from the plate. Following said guillotine shears 11 is a plate feeding mechanism 12 which freely travels within the opening available in said shears. A device 13 for removing ready plates from the automatic line'is mounted on horizontal guides above the plate feeding mechanism 12. g

The band feeding mechanism 6 has two carriages 7 which successively feed the band onto the tumable guillotine shears 10 for cutting plates, which ensures continuous feed .of the band to the guillotine shears. A successive travel of the carriages-7 is effected from the hydraulic drive 8 having a hydraulic cylinder 14 (FIG. 2).with two pistons 15 interconnected by means of a rack 16.-Said rack 16 transmits reversing motion to the carriages 7 of the band feeding mechanism 6 via a gear 17 and a sprocket 18 of a gear train 19, said sprocket being arranged on one shaft 20 together with the gear 17. V

The carriage 7 hasgripping jaws 21 (FIG. 3) with rotary cylinders 22 arranged so that the axes of their rotation are parallel to the direction of the feed of a band 23. Lateral shift of the band is restricted by guide rollers 24.

The additional guillotine shears 11 have a bed frame 25 (FIG. 4) with an opening in a zone where lower knives 26 are a mounted, to ensure passage of the plate feeding mechanism 12. The lower 26 and upper 27 shears are made of separate 1 sections disposed at the edges of the bed frame 25, thus not obstructing the travel of the plate feeding mechanism 12 to the guillotine shears 10 and therefrom to the device 13 for removing ready plates.

The plate feeding mechanism 12 comprises an electromagnet 28 mounted on a carriage 29 with an elongated trunk 30.

The travel of the plate feeding mechanism 12 is restricted by rests 31 and 32. Reciprocating motion of the plate feeding mechanism is effected from a drive 33 similar to the drive 8 of the band feeding mechanism 6.

The device 13 for removing ready plates comprises a frame 39 (FIG. 5) with grips 40-. From a drive 41 theframe 39 undergoes reciprocating motion along guides 42 in a horizontal plane, perpendicular to the travel of the plate feedings.

mechanism 12.

The grips 40 are fashioned as two groups of electromagnets interlocked electrically with the electromagnet 28 of the plate feeding mechanism 12. The drive 41 of the device 13 for removingreadyplates is similar to the drive 8 of the band feeding mechanism 6.

Referring to the cutting sequence as shown at the left side of. FIG. 6, the shears 10 are turned at for each alternate cut so as to produce a trapezoidal plate. The line of cut of the additional shears 11 is shown and it is to be understood that the:

sharp comers which have been shaded are removed from the plate. On the right side of FIG. 6, there is produced a'plater having a :quadrilateral shape with one side inclined with:

respect to the edges and the other side perpendicular thereto. in this case the shears 10 undergo a 45 rotation between successive cuts.

The automatic line for the lateral cutting of a steel band into plates for the magnetic circuits of transformers functions as follows:

A steel band from a roll (not shown in the drawing) mounted on the split socket 2 of the unwinding device 1 is manually charged into the band feeding mechanism 6 through the pulling device 5. Then the drive 3 of the unwinding device 1 and the drive 8 of the feeding mechanism 6 are activated.

Thereafter the line operates automatically.

One of the carriages 7 feeds the band to the guillotine shears 10 which make a 45 turn in a horizontal plane to ensure the cutting-off of plates at a sharp angle. When the carriage 7 reaches the rest 9 positioned as required by the size of a plate being cut off, the drive (not shown in the drawing) of the guillotine shears l and the drive (not shown in the drawing) of the band pulling mechanism are started automatically.

The pulling mechanism 5 pulls the band, one of whose ends is held by a clamp (not shown in the drawing) of the guillotine shears 10, and one side of the band is cut off.

Then, the pulling mechanism 5 releases the band, the carriage 7 returns to the initial position, while the other carriage 7 makes another feed of the band.

Concurrently, the guillotine shears 10 make a 90 turn in a horizontal plane in the opposite direction, the band is again pulled, and another plate is cut off. When necessary, the angle of the turn of the guillotine shears 10 may be varied. In the course of cutting off the plates, the trunk 30 of the plate feeding mechanism 12 is brought up to the guillotine shears 10. Once the cutting operation is over, the electromagnet 28 and the drive 33 of the plate feeding mechanism 12 are switched on. The cutoff plate is attracted to the electromagnet 28 of the plate feeding mechanism 12. Said mechanism, while traveling up to the rest 32 at a speed higher than the speed of band feeding, feeds the plate onto the additional guillotine shears 1 1 for cutting a sharp angle in said plate. The width of thetrunk 30 of the feeding mechanism 12 is less than the minimum width of the plate, and the sharp corner of the plate to be cut by shears 11 is always within a cutting zone. As soon as the plate feeding mechanism 12 reaches the rest 32 and comes to a stop, the drive (not shown in the drawing) of the additional guillotine shears 11 is started, and the lateral cutting of plates near the sharp angle takes place. During the reverse travel of the knives 27 of the additional guillotine shears 11 the hydraulic cylinder 35 starts to operate, and the rest 32 withdraws in the direction of plates feed, thus permitting the plate feeding mechanism 12 to occupy a position under the device 13 for removing ready plates. One group of the electromagnets 40 of the device 13, when in the initial position, is above the ready plate. As soon as the plate feeding mechanism 12 occupies an extreme position, the electromagnet 28 of this mechanism is deactivated, while the group of the electromagnets 40 of the device llli for removing ready plates is actuated. Being attracted by the electromagnet 40 of said device, the plate is brought out of a side limit of the automatic line and dropped into a cup 43. The plate feeding mechanism 12 returns to the initial position for reception of a next plate, and the second group of the electromagnets 40 of the device 13 for removing ready plates occupies the position above the next plate for its reception and disposal on the other side of the line into a cup 441. in the course of the band pulling its feeding discontinues, while-the unwinding device 1 continues to operate and the band reserve is lowered into a well 45 (FIG. 1), thus forming a loop. With the loop becoming bigger and pressing on the terminal switch 4 of the electric drive 3 of the unwinding device 1, the electric drive is disconnected and the unwinding device stops to operate until the band reserve becomes smaller.

When describing the exemplary embodiment of the present invention concrete narrow terminology has been used for the sake of clarity. However, the invention is not limited by the terms adopted and it should be born in mind that each of these terms embraces all the equivalent elements working analogously and used to solve similar problems.

Although the present invention has been described with reference to an exemplary embodiment thereof, various alterations and modifications can be made without departing from the spirit and scope of the invention, as those skilled in the art will easily understand.

We claim:

1. An automatic line for the lateral cutting of a steel band into plates for magnetic circuits of transformers, which comprises: means for unwinding said band; guillotine shear means for successively cutting said band at an acute angle to separate plates from said band; a mechanism for feeding said band to said guillotine shear means; a mechanism for pulling said band in the course of cutting a plate therefrom; additional guillotine shear means for cutting off sharp corners from said plates, said additional guillotine shear means being provided with an opening for passage of said plates; means for removing ready plates including an electromagnet, and means for reciprocally moving said electromagnet through said opening in the additional guillotine shear means to feed cut plates to a said additional shear means and therefrom to said means for removing ready plates, the latter said means comprising a frame with grips, traveling in a horizontal plane perpendicular to the direction of travel of said electromagnet.

2. An automatic line as claimed in claim 1 in which the grips of the device for removing ready plates are arranged as two groups of further electromagnets operating in succession with the first said electromagnet.