US1297236A - Magnetic-clutch-controlling method and apparatus. - Google Patents

Description

K. E. PEILER. MAGNETIC CLUTCH CONTROLLING METHOD AND APPARATUS.

APPLICATION FILED nc. 16. 1915.

1,297,236 Patented Mar. 11,1919.

4f 27 x I z ao '6 At'y.

UNITED STATES PATENT OFFICE.

v .KARL E. PEILER, OF HARTFORD, CONNECTICUT, ASSIGNOB TO HARTFORD FAIRMONT COMPANY, OF CANAJ'OHARIE, NEW YORK, A CORPOR.'.1ION OF NEW YORK.

I MAGNETICCLUTCH-CONTROLLING METHOD AND APPARATUS.

Specification of Letters Patent.

Patented Mar. 11, 1919.

Application filed December 16, 1915. Serial No. 67,103.

To all whom it may concern:

Be it known that I, KARL E. PEILER, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented. new and-useful Improvements in Magnetic-Clutch-Gontroltion alternately seize-and release each other,

the magnet being adapted to have a definite holding power, so as to release whenever the armature and overcoming the inertia of the latter and its connected parts. Hence when these parts are heavy, or their movements extended; or when the magnet operations are repeated in rapid succession, an electric current, suliicient for the required ultimate holding force of the magnet,'may be insufficient to cause the magnet to'seize and move its armature with sufficient rapidity and certainty. This letardation in building up the attractive power of the magnet is sometimes termed magneticlag. The practical efi'ect is that the immediate seizing capacity of a magnet, using a given current is not equal to the ultimate holding capacityof the same magnet under the same current.

The object of this invention is to provide for controlling magnetic clutches under such conditions, varying the electric energy sup-.

plied to the magnet to adapt its seizing and holding powers to its-required functions, in properly timed relation to the performance of those functions. v

Among the uses for which these magnetic clutches are employed, may be instanced that of the pressing of glassware, in which it is desirable to discontinue the pressure upon the plastic glass just when the lattercompletely fills the mold into which it is pressed% I at which point the increasing resistance 0 the glass overcomes the holding power of the clutch and forcibly separates its magnet and the armature members, the latter, after each releasing operation being brought together again for the succeeding pressing operation. It will be understood that this invention may be employed for rotative movements, as g for instance in a rotary or oscillatory clutch,

as well as for the longitudinal reciprocating movements illustrated in the accompanying drawings, which show an embodiment of the invention in a simple type of apparatus.

Figure 1 of the drawings is a side elevation, showing simple elements of a press in which, in this case, the press head or ram operates in a downward direction. Fig. 2 is also an elevation projected from a portion of Fig. 1. Fig. 3 is an elevation showing the clutch of Fig. 1 in its released condition. Fig.4 is an elevation showing a modified application of the invention to a press head of platen operated in an upward direction. It

' will be understood, however,that the movements may be directed or translated in any desired direction.

In the embodiment illustrated in Figs. 1, 2 and 3, a column or frame 5 supports a ram 6 for vertical sliding movement, the lower end of the ram being provided with any well-known chuck or socket for-holding any desired punch or plunger, or other'tooL'thus enabling different implementsto be sadistituted at will. A lever 7 pivoted at 8 to the frame, is connected to the ram in any approved way, the connection here shown be ing a toothed rack and sectorpinion. "To-- ward the other end of the lever, it is pivot.

fitted'to slide freely upon the operatingrod 7 17, which in turn ismounted to slide vertioally in the bosses 18 of the frame or column v5. The operating rod 17 \is moved longitudinally to the extent and at the time required for the operations of the ram fi, by means of a crank or cam, or other wellknown driving member. In the present instance, the rod is driven by a cam 20 adjustably secured to the shaft 21 by means of a set screw 22, and bearing against the friction roller 19 mounted in the rod. At the upper end of the rod 17 "or at any desired portion of its length is secured the magnet 11, by means of a nut 23 or other suitable means. The magnet is electrically connected to its energizing circuit, by means of flexible leads 24, to allow of the desired movement of the magnet. The magnet is here shown to be energized by a battery 25 in the circuit 26, which is also preferably provided with a switch 27. In the circuit is also installed a rheostat 28, which may be adjusted to vary the strength of the ma net. Shunting the rheostat 28 is a circuit 30 having brush terminals 32,through which the shunt circuit is closed by contacting with a moving conductor ,sector 33 carried by the insulating disk 34 adjustably fixed on the cam shaft 21, or connected to some other,

shaft driven in suitable relation therewith.

In cases wherein it is desirable to vary or adjust the seizing power of the magnet, or the rapidity of building it up to a given power, another rheostat 31 is included in the circuit, as shown in Fig. 1. The shunt circuit 30 1s closed by the sector 33 just before the magnet picks up or engages with its armature, and the rheostat 31'is adjusted to suit that operation, while the other rheostat 28 is adjusted to suit the current required through the circuit 26 to energize certainty. The sector 33 closes the circuits a little in advance of the time when the magnet reaches the bottom of its stroke, and makes contact with its armature. After the magnet has firmly seized its armature and has started the parts in motion, the sector 33 leaves the brushes 32,-thus opening the circuit 30, leaving the magnet 11 connected in the circuit 26, the rheostat 28 of which is adjusted to allow the passage of current sufiicient to produce in the magnet the ex act amount of holding power which is to be overcome by the work done by the ram. As soon as the ram 6 encounters 1n 1ts work a reslstance which overcomes the holding power of the magnet, the latter pulls away from its armature, and completes the stroke imparted by its cam 20, returning later to reengage the armature as above described.

By this regulation of the magnet it may.

magnet 40 and its operating rod 41 are or may be similar to that shown in the preceding figures, and may be operated by the same or similar mechanism. The modification is mainly in the mounting and connection of the armature 42, which is here shown as part of a cross head or slide i3 mounted upon rods 44, which may be employed as fixed guide rods, for guiding the movement of the cross head, or may be employed as connecting rods to which the armature is secured for transmitting. the movement of the armature to a more distant point. The upper portion of the slide 43 is here shown to be provided with a seat or socket 45 for receiving any desired form of chuck, plunger, platen, or other implement suited to the work to be done.

' In various ways within the knowledge of those skilled in this art, this invention may be modified to adapt it to different kinds of work or to different types of mechanism.

1 claim as my invention 1. The method of regulating thestrength of a magnetic clutch, which consists in varying the electrical energy supplied to the magnet in timed relation to the work of the clutch.

2. The method of regulating the strength of an electromagneticclutch, to adapt it to different loads, which consists in varying the electricalenergy supplied to the magnet in timed relation to the occurrence of the said loads.

3. The method of regulating the magnetic strength of 'an'electro-magnet, to adapt it to hold and release its armature at difierent loads, which consists. in varying the strength of the current supplied to the magnet in timed relation to and in strength proportioned to the respective loads.

4. The combination with an electro-mag-- netic clutch, of means for varying the electrical energy supplied to the clutch magnet in timed relation to the operations of the clutch.

5. The combination, with an electromagnetic clutch, of means for automatically varying the electrical energ supplied to the magnet at diflerent perio s in the operation of the magnet, and in timed relation to those operations.

6. The combination, with an electro-magnetic clutch, of means for automatically varying the electrical energy supplied to the magnet for the periods at which the magnet engages and releases its armature.

7. The combination, with an electro-magnetic clutch, of means for varying the electrical energy supplied to the magnet in timed relat on to its armature engaging and releasing periods, and in strength adapted to the working requirements of the magnet at those-periods. I 8. The combination, with an electro-magnetic clutch, of means for imparting a succession of movements to one of the clutch members, and means for supplying varying amounts of electrical energy to the magnet in timed relation to the movements of the clutch member.

' 9. The combination, with an electromagnetic clutch, of means for imparting a succession of movements to one of the clutch members, and means for supplying varying amounts of electrical energy to the magnet member between ,the successive operations of the clutch.

10. The combination, with an electro-magnetic'clutch, of means for imparting various amounts of electrical energy to the magnet member of the clutch, including an electric circuit, a rheostat in said circuit, an aux iliary circuit shunting the said rheostat, a second rheostat in the auxiliary circuit, and automatic means for opening and closing the auxiliary circuit.

11. The combination, with an electromagnetic clutch, of means for imparting varying degrees ofelectrical energy to the clutch, including an electrical circuit, a rheostat in said circuit, an auxiliary circuit shunting the said rheostat, a second rheostat in the auxiliary circuit, and automatic means for opening and closing the auxiliary circuit in timed relation to the operations of the clutch.

12. The combination, with an electro-mag: netic clutch, ofa cam imparting a succession of movements to one of the members stat in the said circuit, an auxiliary circuit shunting the said rheostat, a second rheostat in' the auxiliary circuit, and automatic means operating in timed relation to the said cam for opening and closing said aux-2 said circuit, an auxiliary circuit shunting the said rheostat, a second rheostat in the said auxiliary circuit, and automatic means timed with the said moving means for opening and closing the auxiliary circuit.

15. The combination, with a magnet and its armature, of means for moving one of these members toward and from the other, and means timed with the said movements for regulating the holding power of the magnet, giving it initial strength for seizing the armature, and then changing the power of the magnet to a predeterminedweleasing strength whereby the magnet and the armature are separated upon meeting a predeter mined resistance to their united movement.

16. The combination, with a magnet and its armature, of means for moving the magnet toward and from the armature, and means timed with said movements for imparting initial magnetic strength to the mag net for seizing the armature and for changing the strength of the magnet to a predetermined degree, whereby the magnet and armature are separated upon encountering a predetermined resistance to their united of the clutch, and means for! varying the.

magnetic strength of the clutch during the said movements, including an electrical circuit connected with the magnet member, a rheostat in the said circuit, an auxiliary circuit shunting the said rheostat, and automatic means for periodically interrupting and restoring electrical communication in one of said circuits. p

13. The combination with an electro-mag netic clutch, of a cam imparting a succession of movements to one of the members magnetic strength of the clutch during said movement. J i

17 The combmatlon of a magnet and its armature mounted for movement in a direction normal to their meeting surfaces, means for moving one of said parts in said direc tion, and means timed with the said movement for regulating the holding power of the magnet, increasing it to cause the said parts to seize and move together, and dimiir ishing it during said movement, whereby the parts are separated upon encountering a predetermined resistance.

18. The combination of a magnetand its armature mounted for movement in a direction normal to their meeting surfaces, means for moving the magnet in the said direction toward an'dfrom the armature, and means timed with the'said movements of the mag- Ii net for increasing the magnetic holding 1 power of the magnet to cause the armature movements, including an electrical circuit' connected with the magnet member, .a rheoto seize and follow the magnet in its move ment, and for lessening that magnetic strength to a predetermined extent to allow' the parts to separate upon encountering a predetermined resistance.

19. The combination oi? a'magnet and an g memes armature mounted for movementin a direcholding strength to a predetermined degree, tion normal to their meeting surfaces, means whereby the armature is separated from the 10 for reciprocating the magnet toward and magnet upon encountering a predetermined from the armature, and means timed With resistance to its movement.

the said reciprocating means for increasing Signed at Hartford, Connecticut, this 13th the magneticstrength of the magnet to cause day of December, 1915.

it to seize thearmature When these parts are broughttogether, and. for diminishing that KARL E. PEILER.

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