US2091094A - Controlling means for batch operating machines - Google Patents

Description

c. R. DUMBLE 2,091,094

CONTROLLING MEANS FOR BATCH OPERATING MACHINES Aug. 24, 1937.

2 Sheets-Sheet 1 .Filed Oct. l 7, 1935 MY S NQ MUS 93% mm m (Ittornegi N Aug. 24, 1937. c, R DUMBLE 2,091,094

CONTROLL ING MEANS FOR BATCH OPERATING MACHINES Filed Oct. 17, 1935 2 Sheets-Sheet 2 Patented Aug. 24, 1937 UNITED. STATES CONTROLLING MEANS FOR BATCH OPER- ATING MACHINES Clifford R. Dumble, Arlington Heights, Mass., assignor, by mesne assignments, to California Process Company, Los Angeles, Calif., a corporation of Nevada Application October 17, 1935, Serial No. 45,515

19 Claims.

This invention relates to means for controlling the time requiredfor a cycle of operation of machines designed to operate upon batches of materials, such as so-called dusters, fibre cleaning machines, stock washing machines, and

the like. Such batch machines are usually provided with means-for feeding material into a chamber wherein the-material is operated upon for. a length of time and then discharged; and then a fresh batch ofmaterial is fed in and the cycle repeated. In such machines it is frequently necessary ordesirable to vary the time of actual treatment of the batch of material, according to the kind or quality of the material.

The object of my invention is to provide novel means whereby the length of time required for feeding material into the operating chamber may be kept uniform; and also the time required for discharging the material from the operating chamber may be kept uniform; but the time required for operating upon a batch of material (i. e., the time between the feeding and dischargingoperations) may be increased or diminished in accordance with the kind or quality -of the material being treated.

To accomplish this object I have invented novel electro-mechanical control means which I will explain with reference to the accompanying drawings; and set forth in the claims the novel features, and novel constructions and combinations'of parts, for which protection is desired.

In said drawings:-

Fig. 1 is a diagram illustrating the circuit of a time-controlled mechanism arranged in connection with a batch duster of the type referred to.

Fig. 2 is a detail view of disk I.

Fig. 3 is a detail view of disk 6.

Fig. 4 is a diagram illustrating a modification of the invention.

Fig. 5 is a detail of the disk shown in Fig. 4.

The duster indicated in Fig. 1 comprises a rotary beater A mounted within a chamber B partially surrounded by a. screen C. Material is fed into'this chamber by a conveyor D running between rolls E. Material may be discharged from the chamber through an opening normally closed by a door F mounted on a rock shaft G.

The beater A may be rotated continuously at uniform. speed, by any suitable means. As shown it is driven by a belt J from an electrical motor K.

One feed conveyor roll E may be driven by a belt L from an intermittently operated motor M, which is controlled by electrical connections herelnafter described.

The discharge door F may be opened and closed by means of a piston rod I connected to an arm H on shaft G and to a piston N in a cylinder 0, to which air or other fluid may be admitted through pipes P or Q from a pipe X.

connected to a suitable fluid supply. The admission of fluid to the cylinder may be controlled by a valve R in a casing S; said valve having a stem T which is normally held down by contractile springs UU. Stem T is connected'to the core of a solenoid W which is controlled by electrical connections hereinafter described. In the position shown in Fig. l the pipe X is supplying fluidunder pressure to pipe Q discharging below piston. N in cylinder 0; and at the same time any air or fluid above the piston is escaping through pipe P and through duct R in valve R into exhaust pipe X. When valve R is raised by solenoid W, then pipe Xsupplies fluid under pressure to pipe'P through valve R, and at that time the air or fluid below piston N escapes through duct R in valve R, which then registers withpipe Q, and through exhaust pipe X The duster shown is merely for illustrative purposes; in such machine a batch of material is fed into the chamber B by conveyor D, and after it has been sufliciently operated upon by beater A, the discharge door F is opened and the material discharged; then door F is closed; then a fresh batch of material is fed in by the conveyor D; and the aforesaid cycle of operations is repeated.

In my invention the several operations of feeding material to the chamber; dusting the material inthe chamber by the beater; and discharging the material from the chamber, are controlled by electro-mechanical means as follows:

A disk I (Figs. 1 and 2) is mounted upon shaft le of a motor I by which the disk can be rotated at uniform speed. Motor if can be started by closing starter switch lg. The disk I is preferably a fibre disk approximately 15 inches in diameter and of an inch thick, and has eleven concentric circles scribed thereon (see Fig. 2), in which are arranged eleven sets of pin contacts 2; the rows of contacts (beginning with the in-- nermost) respectively containing '7, 8, 9, 10, 11, 12, 14, 16, 20, 25 and 30 pins.

The disk I is preferably operated in a horizontal position, and the pins 2 are approximately 1" long and so set that they project both above and below the disk. Said pins contact with switch blades 2w above the disk, and with switch blades 2t below the disk. The switch blades 21- above the disk are connected together by a jumper 2a. The switch blades 2t below the disk are insulated from each other, and each is connected by a wire 20 to its respective contact 2g on a timing control switch 271. The movable arm ML of switch Zn is connected by a wire 2i to one lead 1 of a transformer or electric power supply It.

Three mercury switches 2m, 5m, 8m are mounted on a carrier 310* (Fig. 1) which can be rocked, by means of solenoids 2s and 3s, to open or close the mercury switches as hereinafter described.

The jumper 2a, common to all the switch 1 blades 2x, is connected by a wire 21} to one side of a mercury switch 2m, and the othersideof by dotted lines b, if any of the contact pins 2' (in the row corresponding with the setting of the movable arm 2h on timing control switch 212) pass between the blades 21', iii, the mercury switch 2m closes the circuit through solenoid 28, which will then move the carrier 3111 to the position indicated in dotted lines.

The mercury switch 8m is open when carrier 31.0 is in position b, but when the carrier is in position c switch 8m is closed. One side of switch 8m is connected by wire 8 to the lead Id of the power supply it. The other side of switch 3722. is connected by wire 8a to one end of a solenoid 8b of an electro-magnetic switch (is controlling the main switch 610 of the plugging device establishing the circuit from the input through wires 00 to the motor 6b, and the other end of solenoid 8b is connected by wire 80 to the lead '1 of the power supply it. When switch 8m is closed coil 81) is energized and closes a switch 6s thereby closing circuit 60 to the motor 6b, which drives a small disk 6 through reduction gearing 6a. The plugging device includes aplugging relay r which is in fact mounted on the shaft of motor 6b (though not so shown in the diagrammatic view, Fig. 1) also circuit connections including a reversing circuit and connections as shown and described in U. S. Letters Patent No. 1,964,199, and. therefore the plugging device needs no detailed description herein.

Disk 6 (Figs. 1 and 3) may also be of fibre and carries three sets of contact pins 3, 4, 5, adapted to respectively contact with switch blades 3a 4a 5a below the disk, and with blades 3?) 4b 5b above the disk. The switch blades 3a- 4a 5a are insulated from each other. The blades 3b 4b 5b are connected by a jumper 6 which is connected by wire 6g to lead '1 of the power supply it.

The switch blade 5a engaging the outer row of pins 5 is connected by wire 50 to one end of a coil 5e in an electro-magnetic switch 5s, the other end of coil 56 being connected by wire 501 to lead id of the power supply It.

The switch blade la of the middle row of pins 5, is connected by wire 40 to end of a coil 46 of an electro-magnetic switch ts, the other end of coil 4e being connected by wire Ad to lead la of the power supply it.

The switch blade 3a of the inner pin 3 is connected by wire 30 to one end of solenoid 3.9, the other end of which is connected by wire 3d to lead la of the power supply whereby when contact 3 is engaged by blades 3a, 3b the solenoid 3s will act to pivot the carrier 3w into the position b shown in Fig. 1, to close mercury switch 5m.

One end of mercury switch 5m is connected by wire 5g to one end of reversing coil 525 of switch when switch 5m is closed coil 5t is actuated to open switch 6s. When motor 61) starts the contacts in relay 51' which is driven by or mounted on the shaft of the motor are closed as described in Patent No. 1,964,199.

"Assume that disk 1 makes only one-third revolution per minute, then if the outer circle of pins 2 is put in circuit by properly shifting arm 2h on switch 2n, a pin 2 in such circle will pass between its respective switch blades 29: 21? every tenth (0.1) of a minute, and therefore disk 6 would be started every tenth (0.1) of a minute. If arm 2h is set so as to make operative the pins 2 in the fourth circle (from the inside) on disk 1 (said circle containing ten contact pins 2), disk 6 would be started every three-tenths (0.3) of a minute.

Assume that the reduction gearing 0a is such that disk 9 makes one revolution in approximately 0.08 minute. During the first 0.02 of a minute of this time the discharge door F is opened and the stock is discharged from the duster by the beater, then during the next 0.01 of a minute (approximately) the door is closed. During the next 0.02 (approximately) of a minute the feed conveyor D is operated to feed a fresh batch of material into the duster chamber B. At approximately 0.01 of a. minute after the end of the feeding period, pin 3 or" disk 6 makes contact and during the next 0.01 minute the circuit to motor 6b is broken and disk 6 is stopped. Said disk may move about 10 or degrees during such 0.01 minute; but the movement of disk 6 during this 0.01 minute is approximately the same each revolution, and is not enough to bring the door operating contacts 5 again into contact with blades 5a 5b.

The beater A can be constantly operated, and continues to operate upon the stock fed thereto during the interval of time between successive startings of the disk 0.

It is assumed above that the disk 8 makes R. P. M. therefore it would take three minutes to make one complete rotation, and the time of the beating operation is the time elapsing between the stopping of the feed and the next opening of the discharge door, and this time can be varied by shifting the arm 272 so as to bring into action any desired row of contact pins on disk 2.

Assuming that disk 0 r quires 0.08 of a minute for one revolution, 0.02 of a. minute is required for the discharge of dusted material, approximately 0.01 of a minute for closing the discharge door, and 0.02 of a. minute for feeding a new batch of material, leaving for each rotation of disk 6 a fixed period for processing of 0.03 of a minute plus small fractional portions of the discharge and feeding operations occasioned by the continuous rotation of beater A. However, disk 0 is intermittently rotated, and therefore the actual period for the processing operation would be the sum of the above fixed period and the actual time interval between successive rotary impulses imparted to disk 0.

Operation of control shown in 1 The parts being properly arranged and elec trically connected as above described, the duster beater is started by motor K. Then arm 2h of the time control 211. is shifted to the contact 2g of that row of pins 2 on disk 5 which will give the desired time interval between operations of disk 0, as hereinbefore explained, assuming disk I rotates at approximately R. P. M. Whenever a pin 2 in the selected row contacts its respective set of switch blades 2t 21' the circuit is closed from the lead 1 of the power supply through arm 2h, pin 2, jumper 2a, and wireZb, mercury switch 2m (the carrier 3w being then in position b), solenoid 2s, and wire 2e to the lead id of the power supply; whereupon the carrier is moved to the position 0. In the position 0 the mercury switch 2m is open.

When carrier 3w is in' position 0 the mercury switch 2m is opened and the switch 8m closes the circuit through the coil 8b of the starter switch 6s through the wires 8 8a and 80. When switch (is is closed the circuit 60 to motor 6b is closed magnetically by operation of switch 6p and'the motor 6b drives disk 6 and the plugging relay Sr is also closed. As disk 6' rotates the circuit through the coil 5e-of the door switch 5s is first closed, as long as contacts 5 on disk 6 are in contact with blades 5a 5b. When switch 5s is closed the valve R, is raised by solenoid W and the discharge door F of the duster is opened by the fluid or compressed air acting above piston N as previously described.

When contact 5 passes out of contact with its switch blades 5a. 5b the valve R is shifted by the action of springs U, and the discharge door F is closed by compressed air acting below piston N.

The contacts 4 on disk 6 then contact with the blades 4a ib and the coil 4c of the feed switch :28 closes the circuit to motor M which drives the feed conveyor D until contacts 4 pass out of engagement with their blades 4a 4b, whereupon motor M ceases to operate.

Then the plugging contact 3 on disk 6 contacts blades 3a 3b, whereupon the circuit 30 301 through the solenoid its is closed, and carrier 3w is moved to position b' thereby closing the mercury switches 2m and 5m and opening the mercury switch 8m.

The closing of mercury switch 5m (as switch Sm opens) will momentarily excite the reversing coil 5t of starter switch 6s, the circuit including wire 5h, switch 5m, wire 59, coil 5t and wire 5k, thereby tending to reverse the direction of rotation of motor 61). The operation of the plugging relay is fully disclosed in Patent No. 1,964,199; but briefly stated is as follows: when switch (is is closed (by coil 82)) an electric circuit is established between two of the input leads 6c and the coil of switch Sp to simultaneously close the switch 6p. Switch 6p however carries an extra contact switch Sq which is opened when switch tip is closed. Around switch 611 are reversing branches 6?" connecting different input leads arranged to reverse the direction of motor 6b, and across the branches GT is a switch 611 operated by a magnetic coil disposed in a circuit connecting the same pair of the input leads 60 as the circuit of switch 68. The circuit of the coil of switch $22 includes the normally open contacts of switch 611, the normally closed contacts of the plugging relay 51' so that when coil 5t opens the switch 6s switch 5p will open, closing switch Sq and thereby establishing the circuit through switch Bv of the reversing branches 6r leading to the motor; but the instant motor 6b starts to turn in a reverse direction the relay contact 51' is opened thereby breaking the circuit to the motor 6b.

The time intervals between rotary impulses imparted to the disk 6 plus the fixed bearing period (0.03 of a minute) for one revolution of disk 6 determines the processing period, and this time interval is controlled by the setting arm 2h. on switch 211. to bring into action any desired row of contact pins 2 on disk I. As the disk l rctates at uniform speed, and assuming that the pins in each row are equally spaced, the disk 5 would be started most frequently when it is actuated by pins in the outermost row on disk and the least frequently when it is operated by pins in the innermost row. By using intermediate rows of pins any desired variation of the processing time (between the longest and the shortest) can be obtained.

Modificazions-Figs. 4 and 5 In Figs. 4 and 5 I show a modification of the discharge door operating mechanism, and of the electrical connections between disk 6 and the door operating mechanism and the feed operating devices. In the construction shown in Fig. 4 the discharge door F is mounted on a shaft G provided with an arm H carrying a roller V on its outer end. Below door F is a cam disk Y mounted on a shaft Y rotated intermittently by a motor Z (as hereinafter described), disk Y having in one face a cam groove Y2 engaged by the roller V on arm H, and as disk Y is rotated the door F will be opened and closed.

Cam disk Y is rotated in the direction of the arrow (Fig. 4), and when roller V is traversing the annular portion a of the cam groove Y2, arm H will be kept in depressed position and hold the discharge door F closed. When roller V enters the portions 1) of the groove the arm H will be caused to open door F; and while the roller traverses the annular portion 0 of said cam groove arm H will hold the door F open. When roller V enters the portion d of the cam groove arm H will close door F, and hold it closed while roller V again traverses portion a of groove Y2.

On the shaft Y or periphery of disk Y is a cam I I, which is adaptedto engage a roller :3 on one end of a pivoted lever F2. The other end of lever l2 carries the movable contact of a normally closed switch l4, controlling the starting and stoping of motor Z.

In the construction shown in Fig. 4 disk 6 has a single contact pin Si! in the outer row, and brush 5b is connected through jumper 6i and wire Go to the lead I of the power supply It. The brush 5a is connected by wire 5c to the fixed contact of the switch 14. The movable contact of said switch is connected by wire 5p to one end of a coil I So. of a switch l5, the other end of the coil [5a. being connected by wire to the lead la of the power supply.

In circuit with the coil !5a. is a relay coil lfizc having contacts l5, H which are closed when coil I5c is excited. Contact iii is connected by wire l6a. to the wire 50 which is connected through switch i4 and coil ii'aa to the lead in of the power supply; while contact I? is directly connected by wire Ha through relay coil l 55:0 to the lead I of the power supply.

The disk I and connection between disk I and disk 6, are like and operate as above described. When motor 6b is energized to drive the disk (5, the single pin 58 on disk contacts with brushes 50., 51), an electric circuit will be momentarily closed from leads i. la. through the starting coil l5a of switch l5, the wire 69, pin 50 and its brushes, wire the switch 24, wire 5p, coil i5a, and wire l5q. Although the circuit through contact pin 59 is momentary, (due to the speed of rotation of disk 6), when coil We is excited the contacts 46 and ll of relay Mia: are also closed, and the coil lEa is maintained excited through the circuit including wires Ha, contacts ll'-lfi, Wire 50, switch M, wire 5p, coil Em, and wire l5q,

switch 55 closed and establish the circuit through the wires I 8 from the input to the motor Z. When motor Z revolves discharge door F is opened and 5 closed as above explained. But when disk ,Y' makes one complete revolution, the cam M will,

move the lever l2, and open switch It, thereby immediately opening the circuit through the coil i500. When the switch 14 opens the circuit through coil 55a, is broken, the connection between the relay contacts i 6 and i1 automatically breaks opening the circuit through coil Mr, and as the switch 4 is closed (immediately after having been opened) by the slight momentary movement of i the motor Z and disk Y, the circuit through coil lea will remain broken, and consequently motor Z will stop. During each revolution of disk Y door F will have been opened and closed, and when disk Y stops cam i I will be in such position that the contacts of the switch M are closed, and the parts are in condition for repeating operations upon the next starting of disk 5.

The operation of the circuit of contact to control the feed mechanism, and the operation of the circuit of reversing contact 38 to stop the motor 61) which rotates the disk 6 is the same as that previously described with respect to contracts 6 and 3 of Figs. 1-3, and therefore need not be repeated here.

The modificationFig. 6

While I have described my invention as used in connection with a duster, it is applicable to other kinds and types of machines working upon batches of material, and is not limited to dusters. Further, while I have described the invention as having a separate motor for driving disk I do not consider the invention restricted to such a drive; for said disk could be driven by clock 40 mechanism, or in some instances could be driven if desired from the beater shaft or main shaft of the machine in which the controlling apparatus is employed. Further in some cases the circuit operating disk 6 could be opened and closed by 45 variable means other than disk I.

I claim:

1. In combination with a machine having an operating chamber provided with an inlet and an outlet; means for feeding material into the 50 inlet; a door for closing the outlet; a rotatable member carrying contacts; a motor for rotating the member; an electric circuit including the motor, a source of electric energy, and a normally open switch; a second rotatable member carrying 55 contacts, means for rotating the second member,

a second electric circuit including the. contacts of the second member, a second source of electric energy, and magnetic means for closing the switch each time the second circuit is closed to cause 60 rotation of the first rotatable member; a third electric circuit adapted to be closed by one contact on said first member and including means for operating the door; a fourth electric circuit adapted to be closed by a second contact on said 65 first member and including means for operating the feeding means; and a fifth electric circuitadapted to be closed by a third contact on said first member and including magnetic means for opening the switch to cause the first rotatable 70 member to cease rotating; the cycle being repeated each time the second circuit is closed.

2. In mechanism as set forth in claim 1, said second rotatable member having a plurality of rows of contacts, each row containing a different 75 number; and selective means in the second cirand thus coils Him and lzr will hold the starter.

cuit for operatively connecting any row of contacts in said circuit.

3. In combination with a machine having an operating chamber with an inlet and an outlet, means for feeding material into the chamber, and means for opening and closing the outlet; a movable member carrying contacts; a motor for moving the member; an electric circuit including the motor, a source of electric energy, and a normally open switch having an actuating coil; means for periodically exciting the coil; a second electric circuit adapted to be closed by a releated contact on said member and including electromechanical means for operating the outlet opening and closing means; a third electric circuit adapted to be closed by a related contact on said member and including electro-mechanical means for operating the feeding means; and a fourth electric circuit adapted to be closed by a related contact on said member and including means for opening the switch to stop the member; each of said circuits being closed and opened during each operation of said member; and the cycle of operations being repeated each time the coil is excited.

4. In combination with mechanism as set forth in claim 3; said means for periodically exciting said coil including mechanism whereby the time interval between successive movements of the member can be varied.

5. In combination with mechanism as set forth in claim 3, said means for periodically exciting the coil including a fifth electric circuit; a rotatable disk having a plurality of series of selective contacts adapted to close the fifth circuit at different time intervals; and selective means whereby any desired series of contacts can be rendered operative to vary the time interval between successive movements of the member.

6. In combination with mechanism as set forth in claim 3, said means for periodically exciting the coil including a rotating timing disk carrying contacts, a timing control switch arranged to complete a circuit through any of the contacts on said timing disk; and a fifth electric circuit including the contacts of the timing disk and the timing control switch.

7. In combination with mechanism as set forth in claim 3, said means for periodically exciting the coil comprising mechanism whereby the interval of time between successive movements of the member can be varied to suit the kind and quality of the material being processed; said mechanism including a rotating timing disk carrying contacts, a timing control switch arranged to complete a circuit through any of the contacts on said timing disk; and a fifth electric circuit including the contacts of the timing disk and the timing control switch.

8. In combination with a machine having a chamber provided with an inlet and an outlet, means for feeding material into the inlet, means for opening and closing the outlet; a movable member carrying contacts; a motor for moving the member; an electric circuit including the motor, a source of electric energy, and a normally open switch having an actuating coil; means for periodically exciting the coil; a second electric circuit adapted to be closed by a related contact on the member and including means for operating the outlet opening and closing means; a third electric circuit adapted to be closed by a related contact on the member after the second mentioned circuit is opened and including means for operating the feeding means; and a fourth electric circuit adapted to be closed by a related contact on said member after the said third circuit is opened and including means for opening the switch to stop the member; and means for intermittently actuating the switch to cause repetitions of the 5 aforesaid cycle of circuit closing operations.

9. In combination with mechanism as set forth in claim 8, means for controlling the periodicity of the intermittently actuating means.

10. In combination with mechanism as set 10 forth in claim 8, means independent of said movable member for controlling the periodicity of the intermittently actuating means.

11. In combination with mechanism as set forth in claim 8, said means for periodically ex- 15 citing the coil including a fifth electric circuit;

a rotatable disk having a plurality of series of contacts adapted to close the fifth circuit at different time intervals, and selective means whereby any desired contact can be rendered opera- 20 tive to vary the interval of time between successive movements of the member.

12. In combination with a machine having an operating chamber provided with an inlet and an outlet, means for feeding material into the inlet, and a door for closing the outlet; a rtatable member carrying contacts; a motor for rotating the member; an electric circuit including the motor, a source of electric energy, and a normally open switch having an actuating coil; means for periodically exciting the coil; a second electric circuit adapted to be closed by contacts on said member during the rotation thereof and including electro-mechanical means for operating the feed means; a third electrical circuit adapted to be closed by contacts on said member during the rotation thereof and including means controlling the means for opening and closing the door; and a fourth electric circuit adapted to be closed by a related contact 40 on said member and including means for opening the switch to stop the member; said circuits being successively closed and opened during each rotation of said member.

13. In combination with mechanism as set 45 forth in claim 12, said means for periodically exciting the coil including means whereby the interval of time between the revolutions of the member can be varied to suit the kind and quality of material being treated.

14. In combination with mechanism as set forth in claim 12, said means for periodically exciting the coil including a fifth electric circuit; a rotatable disk having a plurality of series of contacts adapted to close the fifth circuit at dif- 55 ferent time intervals; and selective means whereby any desired series of contacts can be rendered operative to vary the interval of time between successive rotations of the said member.

15. In combination with mechanism as set forth in claim 12, said means for periodically exciting the coil including a rotating timing disk carrying contacts; a timing control switch adapted to complete a circuit through any of the contacts on said timing disk; and an electric circuit including the contacts of the timing disk and the timing control switch.

16. In combination with mechanism as set forth in claim 12, said means for periodically 70 exciting the coil comprising mechanism whereby the interval of time between the revolutions of the member can be varied as desired to suit the kind and quality of the material being treated; said mechanism including a rotating timing disk carrying contacts, a timing control switch adapted to complete a circuit through any of the contacts on said timing disk; and an electric circuit including the contacts of the timing disk and the timing control switch.

17. In combination with a machine having an operating chamber provided with an inlet and an outlet; means for feeding material into the inlet; a door for closing the outlet; a rotatable member carrying contacts; a reversing motor for rotating the member; an electric circuit including the motor, a source of electric energy, and a normally open switch having starting and reversing coils; a second rotatable member carrying contacts, means for rotating the second member, a second electric circuit including the contacts of the second member, a normally closed mercury switch, a second source of electric energy, and a solenoid; a pivoted carrier for said mercury switch adapted to be shifted when said solenoid is energized to open the mercury switch; a second normally open mercury switch on the carrier; a third electric circuit including the second mercury switch and the second source of electric energy, and the starting coil on the first mentioned switch whereby when the third circuit is closed the switch of the first circuit will be closed to rotate the first member; a fourth electric circuit adapted to be closed by one contact on said first member when rotating and including means for operating the door; a fifth electric circuit adapted to be closed by another contact on said first member when rotating and including means for operating the feeding means; a third mercury switch on the carrier; a sixth electric circuit including the third mercury switch, the second source of electric energy and the reversing coil on the first mentioned switch; a seventh electric circuit adapted to be closed by still another contact on said first member when rotating and including the second source of electric energy and a second solenoid for pivoting the carrier to open the second mercury switch and close the third mercury switch thereby exciting the reversing coil; and a plugging relay on the motor shaft connected in the motor circuit whereby attempted reverse rotation of the motor when the seventh circuit is energized will open the first mentioned switch and the first member will cease rotating.

18. In mechanism as set forth in claim 17, the contacts of the second rotatable member being arranged in a plurality of annular series, and selective means whereby any series of contacts may be brought into operation in the second circuit.

19. In mechanism of the character specified, a rotatable disk carrying a plurality of annular series of contacts, an electric circuit including a source of electric energy; and selective means whereby any row of contacts may be brought into operation in said circuit; a second circuit including a normally open switch and a second source of electric energy; magnetic means in the first circuit adapted to initially close the switch when the first circuit is closed; a second disk; means in the second circuit for rotating the second disk when said switch is closed; and means controlled by the second disk for opening the switch and stopping rotation of the second disk each time it completes one revolution; the second disk being rotated each time a contact closes the first circuit.

CLIFFORD R. DUMBLE.

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