US 2315712 A
Description (OCR text may contain errors)
April 5, 1943 F. H. JAcoBsoN l SEPARATING MACHINE 3 Sheets-Sheet 1 Filed March 27, 1940 April 6, 1943. FrH. JAcoBsoN SEPARATING MACHINE Filed March 27, 1940 5 Sheets-sheet 2 April 6, 1943. F. H. JACoBsoN 2,315,712
SEPARAT'ING MACHINE Filed March 27, 1940 3 Sheets-Sheet E Patented Apr. 6, 1943 UNITED STATES PATENT OFFICE SEPARATING MACHINE Frank H. Jacobson, Minneapolis, Minn. Application March 27, 1940, Serial No. 326,218 14 Claims. (Cl. 209-228) This invention relates to a separating or cleaning device. Certain food and other products,
vsuch as cereals, which have been passed through machinery of various kinds, accumulate some small metallic material and often contain very light dust-like material which it is desired to separate therefrom.
It is an object of this invention to provide a device which will separate metallic particles from a body of material and one which preferably will be continuous and automatic in operation.
It is another object of the invention to provide a separating device comprising a rotatable member having a magnet in a part of its periphery over which the material is passed, together with means for periodically de-energizing said magnet and rotating said member to free material therefrom.
It is another object of the invention to provide a device for eiecting an air separation of the very light non-magnetic particles from the material, the heavier particles then being passed over a magnetic means for separating magnetic material therefrom.
It is more specically an object of the invention to provide a separating device comprising a rotatable drum having a magnet in a portion of its periphery with means for holding said drum stationary with said magnet in operative position, means for rendering inoperative said iirst mentioned means, together with means for then rotating said drum, fle-energizing said magnet and removing material from said drum and magnet.
It is still further an object of the invention to provide a separating device comprising a rotatable drum having a magnet in a portion of its periphery with coils for said magnet within said drum and means for passing a current of air through said drum to cool said coils.
These and other objects and advantages of the invention will be fully set forth in the following description made in connection with the accompanying drawings in which like reference characters refer to similar parts throughout the several views and in which:
Fig. l is a vertical section taken substantially on line I-I of Fig. 3 as indicated by the arrow;
Fig. 2 is a wiring diagram for the device;
Fig. 3 is a View partly in end elevation and partly in vertical section taken substantially on line 3-3 oi' Fig. 1 as indicated by the arrow also showing the upper casing oi' the machine;
Fig. 4 is a view in vertical section taken substantially on line 4 4 of Fig. 1 also showing the upper casing of the machine;
Fig. 5 is a View partly in end elevation and partly in vertical section taken on line 5 5 of Fig. 1 as indicated by the arrows;
Fig. 6 is a view in end elevation of a stop mechanism used; and
Fig. 7 4is a top plan View of the mechanism shown in Fig. 6.
Referring to the drawings, a machine is shown comprising a casing or frame designated generally as Il), the same having a base plate portion Ita. End plates IOb extend vertically at each end of said frame from which project outwardly cylindrical portions IOc. Vertical ribs I 0d and Ille extend at the center and sides of the frame at each end and horizontal ribs IIJf extend outwardly from the cylindrical portion I 0c to the vertical ribs Ie. The casing is divided along a horizontal diameter of the portions I 0c and there is an upper portion I 0g comprising the upper half of portions IGC, horizontal ribs Ih engaging ribs Iilf and a substantially semicylindrical portion I di. Portion Ii has an -upwardly projecting housing portion |07 adapted to enclose certain driving parts. An outer` housing Il extends upwardly above ribs If, the same being substantially rectangular in horizontal cross section but having at one upper side a vertically projecting chute I2 having an inclined bottom portion I2a, said chute being open at its bottom to communicate with the chamber within housing II. Housing II is shown as hinged at one side by hinges I3 to the lower portion of casing IU so that the same can be swung or tilted. A drum designated generally as I4 is provided, the same having end members I4a each provided with an outwardly projecting cylindrical iia-nge I4b and a central hub I 4c, ange I4b being c'onnected to hub I 4c by radial arms I4d. Hubs'l4c have secured therein shafts I5 and I5 respectively which are'journaled in bearings II shown as of the ball type and held inv place at their inner sides by plates I8 and at their outer sides by nuts I9 threaded on reduced portions of shafts I5 and I6 respectively. The bearings I'I are carried in members or blocks 20 secured to casing I0. The drum I4 has mounted therein a magnet frame designated generally as 2l, the same having side plates 2Ia and an end plate 2lb. Pole pieces 22 extend lengthwise of drum I4 and have wound thereon the magnet coils 23 which extend substantially the full length of drum I4. The magnet portion 24 is secured to the outer ends of pole pieces 22 and side members 2Ia, the same having its outer surface lying substantially in the periphery of drum I4 and a casing I4e of rather thin material extends about the inner portions of flanges I4b from one side of magnet 24 to the other side thereof. The end plate 2Ib as shown is made rather heavy and of considerable weight to act as a counterbalance for drum I4 as the coils 23 are off center or eccentric of said drum. Magnet 24 is shown as having recesses in the face thereof with flat sides in angular relation. The drum I4 is adapted to be driven and for this purpose rollers 26 are provided adapted to engage the outer side of each flange I4h, said rollers being secured to a shaft 21 having its ends journaled in the ends of frame portions |67', said shaft having secured thereto at one end a gear 24 with which meshes a pinion 2Q. Pinion 23 is secured to a shaft 3i) also having its ends journaled in the end portions of frame portions Ii, said shaft projecting beyond said frame portion at one end and having a pulley 3| secured thereto shown as having a V-shaped groove therein. The drum flanges 14h each have a recess I4f formed therein for a portion of its periphery, the bottom of which is spaced from the periphery of roller 26. As shown in Fig. 4 there is a slot Im providing for adjustment of shaft 21 and rollers 26 as the anges I4?) wear. Shaft 36 also has a small pulley 32 secured thereto within one of the portions |07' which is in line with a pulley 33.journaled on shaft I5. A fan 34 is secured to pulley 33 arranged to direct a current of air inwardly through drum I4. It will be noted that pulley 33 is disposed between the end of hub I4c and the end of plate I8. A belt 36 passes over pulley 32 and over another pulley 31 journaled on a stud 38 secured in one end of frame Il). Belt 36 as shown in Fig. 5 runs along and engages one side of pulley 33 so that the latter is driven.
A -switch 40 illustrated as of the mercury tube typeis secured to one end of drum I4 and is included in the circuit of the magnet coils 23. When the magnet 24 is in operative position as shown in Fig. 4' the contacts 46a in-switch 46 will be closed by the mercury therein. When the drum revolves so that the mercury runs into the other end of the tube, contacts 40 will be separated and current will be cut off from the coils 23 so that masnet 24 will be de-energized. A ring supporting member 4I of insulating material is secured to the outer end of shaft I6, being engaged by a plate 4Icand slip ringsllla and 4Ib are carried on member 4I at each side of an annular rib thereon. Rings. 4Ia and 41h are respectively engaged by a pair of brushes 42, the outer one of which isr shown in Fig. 3. Shaft I6 hasacentral bore |6a through which conducto-rs from coils 23 pass, one conductor being connected tov slip ring 4Ia in any suitable manner and the other being connected to one contact of switch'46. The other Contact of switch 40 is connected by a suitable conductor to the other ring 4Ib in any convenient and suitable manner. Drum I4 has on one of its flanges Mb a stop lugv I4g arranged to be engaged by a stop pin 43. Pin 43 forms the core of a solenoid 44 having a coil surrounding said A. coiled compression spring 43h underlies plunger 43 normally urging the same to its outward position. Said solenoid 44 is pivoted for swinging movement on a stud 45 secured to a bracket 46 in turn carried by andv secured to base plate Ita by bolts 46a. Pin 43'has a recess 43a in its end into which lug I4g moves when pin 43 is in stop position., said recess forming a flat surface for engagement of lug I4g. The solenoid or magnet 44 is normally urged to swing to the right as seen in Figs. 3 and 6 by a tensile coiled spring 41 secured thereto by a stud 48 and secured at its other end to bracket 46 by a stud 46. Stud 43 projects outwardly as a pin and is adapted to engage a yoke or substantially V-shaped member 56 pivoted to bracket 46 at its bight end by a stud 6I. A headed stud 52 projects from one side of member 56 and is engaged by a plate spring 53 extending upwardly from and secured to bracket 46 by a screw 64. A magnet coil 55 is mounted on frame 46 by a headed screw 56 and has a pole piece 61 extending across its lower end and having side portions disposed vertically at either side thereof, the tops of which are in one plane and adapted to be engaged by one side of member 5t. Member 56 carries a pair of switches 58 and 5S shown as of the mercury tube type, the same having contacts 58a and 59a respectively. A timer device or clock is used which turns a disk 66 having therein a plurality of notches 66o equally spaced circumferentially thereof. The number of these notches may be varied and disks having various numbers of notches may be used. In the embodiment of the invention illustrated four notches are shown. In one common form of the invention disk 63 is driven from the hour shaft of the clock. A pawl 6I pivoted at 62 is resiliently urged against the periphery of disk 66 and a switch 63 is carried by pawl 6 I. Switch 63 is of the mercury tube type and has contacts 53a. When pawl 6I is riding on the periphery of disk 6!) switch 63 is in the position shown so that contacts 63a are separated. When pawl 6I drops into one of the notches 60a tube 63 moves therewith and into position for the mercury to connect contacts 63a. ConductorsA are shown for the parts in Figs. 6 and I including a line conductor 65 which extends to one of the contacts 63a. Another line conductor 66 extends to one end of the winding of solenoid or magnet coil 44. A conductor 61 extends from the other contact 63a to one contact 69a and a conductor 68 extends from said contact 59a to one of the contacts 58a. A conductor 69 extends from the other contact 56a to the other end of the winding of solenoid or magnet coil 44. A conductor 1E! extends from the other contact 59a to one end of the winding of magnet coil 56. Another conductor 1I extends from the other end of the winding of magnet coil 55 to line conductor 66.
The material is discharged into the top of casing Il at the opening IIa. The material engages a slide 15 pivoted at 15 and which can be moved to different positions about its pivot. The material engages another slide 11 pivoted at 18 so as to be adjusted about said pivot and an extension slide 16 is secured to slide 11 and movable longitudinally thereof to diiferent positions. Below slides 15 and 11 is a slide 80 movable about a pivot 8 I and having an extension slide 82 secured thereto and movable longitudinally thereof. Beneath slide 82 is another slide 83 which inclines downwardly toward drum I4 to a point at the upper end of magnet 24. A slide 84 is pivoted at 85 adjacent one side of casing I I and inclines downwardly toward slide 63, the same having an auxiliary extension slide 66 movable downwardly toward and from magnet 24. Slide 84 is disposed just below the inclined bottom |205 of chute I2. It will be seen that chute I2 extends upwardly having one side disposed substantially over the end of slide 32 as shown.
Below drum i4 is disposed a slide or deflecting plate 68 pivoted at 89, the same terminating adjacent the top of a receptacle or trough 96.
`each of which is connected a coiled tensile spring 95 having its other end secured to casing I0 at 96. The member 93 will have a member 93a of some soft material, such as lambs wool, secured along its free edge which will be in engagement with casing I 4e. Receptacle 99 is slidable outwardly at one side of casing I0, the same having an end plate 90b engaging the front of casing I0 and base plate |a and having a handle 90e.
In Fig. 2 a wiring diagram for the machine is shown comprising line conductors |00, I0| and |02 for alternating current. A switch |03 has contacts for engaging said line conductors and conductors |04, and |06 extend toa motor |01 which will have a suitable pulley on the driving shaft thereof from which a. belt will pass to pulley 3|, Conductors |08 and |09 are shown constituting line conductors for direct current and a switch ||0 has contacts for connecting to conductors |08 and |09. A switch |I| is provided having movable contacts Ia adapted to engage respectively with contacts I Ib having conductors connected respectively to the contacts of switch ||0. A magnet 2 is provided for controlling switch the same being energized by conductors 3 connected in turn by conductors II 4 and ||5 to two contacts of switch |03. Co'nductors ||4 and ||5 extend to the timer disk 60 which is adapted to close the switch 63. A pair of conductors ||8 and ||9 extend from the contacts IIIa of switch III and are connected to the brushes 42 respectively which engage rings 4ta and 4|b respectively. A conductor |20 extends from one ring 4|b to one contact of switch 40,
the other contact of which is connected to a conf.
ductor |2| which extends to one end of one of the magnet coils 23, which coil is connected at its other end to one end of the other magnet coil 23. The opposite end of the lat-ter coil is connected by conductor |22 to the other ring 4|a. Conductors 65 and 66 exten-d from conductors IIB and ||9 respectively, conductor 65 being connected to one terminal of switch 63. Conductor I66 extends to one end of the winding of solenoid or magnet coil 44. A conductor '61 extends from the terminal or contact of switch 63 and is connected to a movable contact 12 of a double pole switch having contacts 12a with either of which contact 12 is adapted to engage. One of the contacts 12a is connected by conductor I0 to A.one
.end of the winding of magnet coil 55. The other end of the winding of magnet coil 55 is connected by a conductor 1| which extends to and is connected to conductor 66. The other contacs12a. is connected by a conductor 69 to the other end of the winding of solenoid or magnet coil 44.
In operation, the material to be separated, such as a cereal food, will be 4delivered into opening I la. and will slide down between slides 15 and slid-es 11 and 19. These can be adjusted to give the desired opening therebetween to give the proper feed of material. A current of air will be directed upwardly in housing I2 by a suitable fan (not shown) and the material passing downwardly over the end of slide I9 will be engaged byV this current of air. The air will pass tln'ough"t`ne` stream of material and only the very heavy particles which it is desired to eliminate will continue down on slides 82 and 60 and be discharged therefrom. This material will drop into the front of drawer or receptacle l along the side of casing and the side of casing I0. Most of the material will be carried up over the tcp of slide 82 by the air and will drop downy between slides 83 and 84. Only the very lightest particles or dust which it is desired to separate out will pass upwardly in housing I2 with the current of air. The main body of material thus falls between and onto slides 83 and 84 and is directed downwardly at the upper portion of magnet 24. It will be seen that the extension slides 19 can be moved, as stated, to regulate the space through which the air passing through the stream of material must flow. The velocity or force of the air current can thus be regulated. Extension slide 86 can also be moved toward and from drum 24 to regulate the size of the stream of material passing over the drum and magnet. The magnet is in operative position as shown in Fig. 4 and in this position will be energized. The material thus passes down along and over magnet 24 and any small metallic particles will be attracted by an-d separated out by the magnet. There are usually ne particles in the nature of lings which accumulate from the machinery through which the material has passed. Should there be any larger metallic particles these will also be intercepted and separated by magnet 24. The sharp ridge portions on the magnet giving a sort of saw-tooth effect are provided to give an increase or concentration of flux.
As the particles are thus attracted by the magnet and the material continues to flow the particles so attracted will be moved into the recesses on the face of the magnet. The particles thus accurnu late in these recesses and are not thus easily swept oil of the magnet. The material after passing over the magnet drops down the side of casing and the side of casing I0 and will be discharged through said casing into any suitable receptacle.
Pulley 3| is constantly driven by motor |01 so that belt 36 is constantly driven. Fan 34 is thus driven and a current of air is forced through drum I4, lengthwise thereof, which current acts to keep the magnet coils 23 cool. While the magnet 24 is in its operative position drum I 4 is held stationary by stop 43 engaging stop lug |4'g. At intervals determined by the timer disk 60 pawl 6| will drop into one of the notches 60o., which as explained, will act to close switch 63. It is pointed out that switch and magnet |I2 shown in Fig. 2 are provided so that the direct current to coils 23 and other parts will not be turned on unless the alternating currentV switch |03 is closed. When the switch |03 is closed magnet ||2 is energized through conductors I3 and I| 4 connected to the line conductors |00 and I0| and switch |I| is moved to closed position. With the magnet in operative position as shown in Fig. 4. switch 40 as already explained is closed. When switch 63 is closed by operation of the timer disk, current -is supplied through conductor 66 to one end of the winding of magnet coil 44. Current simultaneously flows through conductor 65, through switch 63, through conductor 61 to conductor 68. through switch 58 which is in closed position as shown in Figs. and (i, then through conductor 69 to the other end of the winding of coil 44. Solenoid or magnet coil 44 is now energized and plunger 43 is moved downwardly into said coil, thus moving out of engagement with lug |4g and releasing drum I4. Shaft 30 is continuously driven and through gears 29 and 28 drives the rollers 26. As shown in Fig. 3 when the magnet 24 is in vone end of recesses vthe drawer Si".
'tween-piates 8&3 and operative position the roliers 2t are in line with Ilif so that they have no driving eiect upon drum ifi. As Soon as the drum is released by plunger #i3 the drum moves in a .clockwise direction due to the weight of magnetv 24 and coils 223 and the flanges hib are brought into .driving relation to rollers 25. Rollers 2t new engage the flanges ib and drum i4 is rotated clockwise. As the drum moves around past member 3 and member Sitay the material on the magnet and any material which may be on the drum adjacent the magnet is removed therefrom by member and this material drops between the plates 8 and Si! into When switch i6 moves upward to asposition adjacent the top of the drum the mercury therein disconnects the contacts ica and the circuit'through the coils 23 is broken. When magnet 2e, therefore, comes to a position be- Si it is ole-energized and the material can drop therefrom. Any other material as stated is removed by member 33d. As soon as plunger d3 is withdrawn from lug itlsaid plunger with coil i4 is swung downwardly or toward the right as shown in Figs. 3
The end of plunger 43 thus plunger 53.
and 6 by spring 6.1., clears lug it] which moves past 4is-coil swings downwardly pin i3 engages member 5i! and swings the same clockwise about its pivot bolt 5i. This swinging movement of member 5i! causes opening of the contacts 353e and closing of contacts 5ta. The opening of contacts 58a breaks the circuit thro-ugh -coil lili so that the coil is de-energized and plunger i3 isl moved outwardly by its spring. Plunger-lii is :thus again in position to be engaged by lug Iegas drum ifi completes a revolution. When contacts 5ta ci switch 59 are closed by the mercury in said switch a circuit is closed through magnet 55 which may be traced from line conductor (i5 through switch 63, conductor tl, switch 59, conductor iii, through the coil of magnet 55, conductor il back to line conductor 5. Conductors 55 and it as shown in the wiring diagram in Fig. 2 are connected in the direct current line.
vlViagnet 55 is thus energized and member 53 which acts as an armature is held in the position to which it was swung by pin 63 by magnet 5l. When the drum i!! completes a revolution lug idg' engages plunger 3 and the drum is again stopped inthe position shown in Fig. 3, the magnet gli is energized by the circuit again being` closed through magnet coils 23 by switch lili. The timer disk continues to rotate and pawl 6l is soon moved to position to cause the contacts in switch (i3 to be separated and when this occurs the circuit through magnet-55 is broken and said magnet is de-energized. When this happens the leaf spring 53 acting on pin 52 swings member 5) back to the position shown in Fig. 6 andthe parts are again innormal position with magnet 2d energized. With the magnet in normal position it will again be noted thatdriving rollers it are opposite one end of the recesses IM and are thus out of driving engagement with the drum. The action of the two mercury tube switches 58 and 59 is quite similar to that of a double throw double contact switch and such a switch is illustrated as 1?., 12a in Fig. 2 instead of showing the two switches 58 and 59.
From the above description it will beseen that I have produced a comparatively simple and very efr'cient separating device. The machine acts automatically to separate the metallic particles and to be cleaned of these separated particles. The very heavy and very light non-magnetic particles are also separated from the main bodt7 of material treated. By having the magnet only at a portion of the periphery of the drum the mechanism or ux can be highly concentrated at this point and a more certain separation made than where the whole surface of a drum is composed of magnetic portions. Thus by having a portion of the periphery magnetic and periodically rotating the drum to clean the same a more desirable action is secured. The machine has been amply demonstrated in actual practice, is being commercially made, and has been very successful.
v It will, o course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts, without departing from the scope o applicants invention, which generally stated, consists in a device capable or" carrying out the objects above set forth, in the parts and combinations of parts disclosed and defined in the appended claims.
What is claimed is:
l. A separating device having in combination, a revoluble member having a portion of its periphery formed as a magnet, a stop engaging said member to hold the same stationary, means for rotating said member, a magnet for withdrawing said stop, a circuit for energizing said magnet and a time controlled switch for periodically closing said circuit and withdrawing said stop to permit rotation'oi said member.
2. A separating device having in combination, a drum having a magnet in a portion of its periphery, a stop, means on said drum engageable with said stop, a magnet coil for moving said stop out of engagement with said means, means for swinging said coil and stop and breaking the circuit o said magnet coil so that said stop may be returned to position to be engaged by said means as said drum revolves.
3. A separating device having in combination, a drum, a magnet carried by said drum in a portion of its periphery, a roller engaging said drum for rotating the same, means for holding said drum stationary with said magnet in operative position and said roller out of contact with said drum, means for rendering said means inoperative, said drurn being movable by gravity to cause contact between the same and said roller to cause rotation of said drum.
4. A separating device having in combination, a drum, a magnet carried by said drum in a portion of its periphery, said drum having a flange thereon, a roller engaging said flange for rotating said drum, means for holding said drum stationary with said magnet in operative position, said drum having a recess in said flange which is opposite said roller with the drum in said position.
5. The structure set forth in claim 4, means for rendering said means inoperative to free said drum for rotation, said drum then being movable by gravity to move said recess o-ut of alinement with said roller and cause engagement of said drum and roller to rotate said drum.
6. A separating device having in combination, a revoluble member having a portion of its periphery formed as a magnet, means for delivering material adjacent said member and over said magnet, means for energizing said magnet, means for preveniti'ng rotation of said n einher aind means for periodically rendering said last mentioned means inoperative Vdeenergizing said magnet and rotating said member through to remove material therefrom.
7. A separating device having in combination, a revoluble drum, a stop, said drum having a portion for engaging said stop and holding sai-d drum stationary, a magnet coil for withdrawing said stop from engagement with said portion, said coil and stop being pivoted for swinging movement, means normally tending to swing said coil and stop and for swinging the same when said stop is disengaged from said portion, a switch movable with said coil in its swinging movement to open the circuit through said magnet coil for permitting said stop to move into position to be again engaged by said portion.
8. A separating device having in combination, a rotatable member having a magnet in a portion of its periphery, means for directing material past said member and magnet, a stop for holding said member in stationary position, a magnet coil for withdrawing said stop, a circuit including said coil and means for periodically closing said circuit to withdraw said stop and permit rotation of said drum.
9. A separating device having in combination, a rotatable member having a magnet in a portion of its periphery, means for directing material past said member and magnet, a stop for holding said member in stationary position, a magnet coil for withdrawing said stop, a circuit including said coil, a timer operated switch for periodically closing said circuit to withdraw said stop, means for rotating said member and means for removing material from said member and magnet.
10. A separating device having in combination, a rotatable member having a magnet in a portion of its periphery, a stop for holding said member in stationary position, a magnet coil for withdrawing said stop, said coil and stop being mounted for swinging movement, a spring normally acting to swing said coil and magnet for swinging the same when said stop is withdrawn, a second member pivoted and adapted to be moved by the swinging of said coil, a switch carried by said second member, a holding magnet for holding said member in the position to which it is moved, said switch acting when said second member is swung to break the circuit through said magnet coil and close a circuit through said holding magnet and means for periodically closing said circuit through said magnet coil.
11. The structure set forth in claim 10, said second member acting as an armature for said holding magnet and being held in the position 360 degrees to which it is swung by said holding magnet whereby said circuit of said magnet coil is held open.
i2. A separating device having in combination, a revoluble member having a portion of its periphery formed as a magnet, means for delivering material along said member adjacent said magnet, a rotating means for said member inoperative when said magnet is in operative position, a stop member for holding said member with said magnet in operative position, periodically operated means for moving said stop member to permit said rotating means to rotate said member through one revolution, means for deenergizing said magnet during said rotation, means for removing material from said magnet and member during said rotation and means for moving said stop to operative position to again hold said member with said magnet in operative position after said rotation.
13. A separating device having in combination, a revoluble member having a portion of its periphery formed as a magnet, means for delivering material along said member adjacent said magnet, a. rotating driven means for rotating said member, means for holding said member in stationary position, means for periodically rendering said last mentioned means inoperative to permit said second mentioned means to become operative removing the material from said member and magnet during the rotation of said member.
14. A separating device having in combination, a revoluble member having a portion of its periphery formed as a magnet, means for delivering material along one side of said member adjacent said magnet, rotating driven means constructed and arranged to rotate said member, a stop for holding said member against rotation with said magnet in operative position, means acting periodically for moving said stop to inoperative position to permit rotation of said member through 360 degrees by said second mentioned means, means for deenergizing said magnet during rotation of said member, means for removing material from said magnet and member during rotation of said member and means for moving said stop to operative position to hold said member with said magnet energized and in operative position after said rotation.
FRANK H. JACOBSON.