US1979319A - Synchronous motor job time - Google Patents

Description

NOV. 6, 1934. L, -row 1,979,319

SY NCHRONOUS MOTOR JOB TIME RECORDER Filed Sept. 24, 1932 Patented Nov. 6, 1934 UNETED STATES PATENT OFFICE SYN CHRONOUS MOTOR JOB TIME RECORDER Application September 24, 1932, Serial No. 634,667

5 Claims.

My invention relates to job time recorders and more specifically to a synchronous motordriven job time recorder arranged to suspend operation during non-working periods.

, The purpose of a job time recorder is to make a printed record of the time a Workman starts and stops work on a given job. This printed record is used by the cost-keeping department as a basis for determining the labor cost involved in manufacturing a given product.

The workman is provided with a card or ticket upon which he stamps the starting time by inserting the card in the job time recorder and manually actuating the imprint lever which causes the recorder to make a time imprint. When he finishes that particular job he again inserts that same ticket in the job time recorder and makes a second time imprint. The difference in time between these two imprints indicates the elapsed time involved on that particular job.

As described in my co-pending application, Serial No. 634,666, filed September 24, 1932, in certain cost-keeping systems it is desirable to have job time recorders automatically stop operating during the non-working periods, which are usually the lunch and supper periods. This is a practice that has been quite extensively used with minute impulse systems but has not been made use of with synchronous motor-driven recorders, because the recorders would not operate in synchronism when started and stopped, due to the fact that certain motors will start slower than others and also that certain motors will run longer after the current has been cut off.

When the recorders are arranged to eliminate the non-working periods, the type wheels cover a period of less than twenty-four hours. For instance, many job recorders cover a cycle of twenty-two hours. Therefore, in each day of twenty-four hours the recorder must be idle for two hours. This two-hour period may be divided into three divisions, using one-half hour for lunch, one-half hour for supper and one hour to be eliminated usually just before the beginning of the next working day. Occasionally, recorders are arranged for a twenty, twentyone, or a twenty-three hour period.

The system disclosed in my co-pending application, Serial No. 634,666, involved the use of two circuits between the master and secondary apparatus. One of the objects of my invention is to provide a system with means for correcting the daily error occasioned by the difierent rates at which the motor picks up after it has stopped and drifts after it has been cut ofi which involves the use of only one circuit between the master and secondary apparatus.

Further objects will be apparent from the description and claims.

In the drawing, in which an embodiment of my invention is shown:

Figure l is a diagrammatic view of my improved system.

Referring to the drawing in detail, the system shown therein comprises a plurality of secondary apparatuses 1, each secondary apparatus comprising a synchronous motor 2, a cam wheel 3, driven by this synchronous motor 2, a switch 4 controlled by this cam wheel 3 for cutting ofi the secondary apparatus at the end of its cycle, and master apparatus including a synchronous motor 5, a pair of cam Wheels 6 and 7 driven by this master synchronous motor, a sequence switch 8 controlled by the cam wheel 6 for controlling the stopping and starting of the motor for the non-working periods, a normal voltage circuit 9 for the normal supply to the master and secondary apparatuses, a high voltage circuit 10 for starting the secondary apparatuses after they have stopped at the end of their cycle and a pair of sequence switches 11 controlled by the cam wheel 7 for periodically cutting in the high voltage current on the circuits for the secondary apparatuses.

In addition to the above apparatus, each secondary apparatus is provided with a resistance coil 12, in bridge of the cam-controlled switch 4, so designed that when the switch 4 is open the normal voltage will be insufficient to operate the secondary synchronous motor 2 but so that when the high voltage is cut in, it will be sufiicient to cause operation of the secondary synchronous motor.

In use, the cam wheel 6 will be designed so as to stop the secondary apparatus at the beginning of each non-working period and start it again at the end of each non-working period. Thus, if there is a non-working period from 12:00 noon to 12:30 P. M., the cam wheel 6 will momentarily energize the electro-magnet 13 which will advance the sequence switch 8 a quarter revolution, bringing the low point of the rotor underneath the contact 14 and thus interrupting the power circuit to the secondary apparatus.

At the end of each non-working period, the cam wheel 6 again momentarily closes the cirquence switch 8 to be given another quarter turn, bringing the high spot of the rotor underneath the contact 14 and thus completing the power circuit for the secondary apparatus causing the secondary apparatus to start up again at the end of the non-working period. This operation is repeated for each non-working period and throughout the day.

As previously indicated, in a system in common use, it is usual to have a non-working period for lunch, a non-working period for supper, and a period of idleness at the end of the daily cycle and just before the beginning of the next days cycle. This period of idlenessbee tween the end of one cycle and the beginning of another varies but in some systems an idle hour is provided so that each secondary apparatus stops itself an hour before the beginning of the next days cycle, thus insuring that all of,

the secondary apparatuses are brought into substantial synchronism once each day, preventing any cumulative error due to starting and stopping. 'For instance, if the days cycle begins at 7:' OOofclOck, each secondary apparatus will cut itself off from the power circuit at 6: 00 oclock. This automatic cut-off is accomplished by the cam wheel 3, which may be so designed that at the contacts 4, thus re-establishing the normal the end of the days cycle, for example at 6: 00 A. M., by secondary apparatus time, the cam wheel 3 will permit the movable contact 4 to drop, interrupting the normal power circuit and stopping the motor 2.

To start thesecondary apparatus up again, the master control cam wheel '7 is designed to momentarily close the circuit at the beginning of the new cycle, energizing the electromagnet 15 and causing the rotors of the sequence switches 11 to'be turned an eighth of a revolution. 'Thisperniits the movable contacts 16 todisen'gage the normal voltage contacts 17 and. to engagethe'high voltage contacts 18, thus switching the secondary circuit from normal voltage to high voltage. This high voltage is sufficient to start up the secondary apparatuses in spite of the resistance 12 so that at the begin ning of the cycle all of the secondary apparamen/11 be started up at'thesame time in synchronismi with the master clock. The cam wheels 3 of the secondary apparatusesareso designed that shortly after they are started up at thebeginning of the new cycle they, will lift circuits so that the secondaries can now be operated onnormal voltage. Shortly afterthis takes iplace, thefcam wheel '7 of the master clock will again momentarily energize the electromagn'et 15, again advancing each of the rotors of the sequence switches 11 an eighth of a revolution, lifting the contacts 16 and re-establishing the normal voltage connections for the secondary circuit.

,It is obvious that there will be some saving of electrical energy if the contact 14 is caused to open at theend of the cycle. This can be accomplished by a suitable design of the cam wheel 6 which can be made to open the circuit 19 just after the end of the cycle of the second ary clocks and to close it again just before the beginning of the new cycle.

Further modifications will be apparent to those skilled, inthej artand it is desired, therefore, that the invention be limited only by the prior art and the scope of the appended claims.

Having thus described my invention, what I claim and desire tosecure by Letters Patent is:

1., A synchronous motor 3 0b timerecorder System comprising master apparatus and a plurality of secondary apparatuses, each secondary apparatus comprising a synchronous motor and means controlled by the individual secondary apparatus time for stopping it at the end of its cycle, said master apparatus comprising means controlled by master apparatus time for stopping the secondary apparatus, and for starting the secondary apparatuses after they have been stopped by the master apparatus, and means controlled by master apparatus time for starting the secondary apparatuses after they have been stopped by the secondary apparatuses themselves at the end of their cycles, said system having but a single circuit between the master and secondary apparatus.

2. A synchronous motor job time recorded system comprising master apparatus and a plurality of secondary apparatuses, each secondary apparatus comprising a synchronous motor and means controlled by the individual secondary apparatus time for stopping it at the end of its cycle, said master apparatus cofmprisingmeans controlled by, master apparatus time for stopping the secondaryapparatus, and for startingv the secondary apparatuses after they have been stopped by the master apparatus, and means controlled by masteriapparatus, time iorstarting the secondary apparatusesjaiiter they have been stopped by the secondary apparatuses themselves at the end of their cycles, said, systemhaving a but a single circuit between the. master and secondary apparatus, said secondary apparatus stopping means comprising means for increasing the resistance of the secondary motor circuit to prevent normal voltage. from operating 1! the motor, and said means for starting the secondary apparatus after.v it has been stopped at the end of its cycle including means controlled by the master apparatus for increasing the voltage for the secondary apparatus motor sufie ciently to start it notwithstanding theincreased resistance. p

3- A synchronous motor job. time recorder system comprisingmaster apparatus and a pluralityof secondary apparatuses,each-secondary iii apparatus comprising a synchronous motor and means controlled by the-individual secondary apparatus time for stopping, it. at, the end of its cycle, said 'masterapparatus comprisingmeans 19.5 controlled by master apparatus,v time for ,stopping the secondary apparatus, andfor starting thei -secondary apparatuses after they have, been stoppe'dlby the master. apparatus, andmeans controlled by master apparatus time for starting 13 the secondary apparatuses after they have been s. stopped by the secondary apparatuses themselves at the end of their cycles, saidsystem having but a single circuit between themaster and secondary apparatus, 1 said secondary ap paratus stopping means comprising means for increasingthe resistance of. the secondary mo? tor circuit to prevent normal voltage from opcrating the motor, andsaid means for starting The secondary apparatus aftenit has been stopped at the end of itscycle including means controlled by the master, apparatus for increasing the voltage for the secondary apparatus motor sufficiently to start itnotwithstanding the increased resistance, said voltage increasing means comprisingswitch means controlled .by master apparatus time for switching fromnormal voltage, to high voltage. f

4. A synchronous motor job,.time,-recorder; yst m c mpr si i ta r a e n s- 9 rality of secondary apparatuses, each secondary apparatus comprising a synchronous motor and means controlled by the individual secondary apparatus time for stopping it at the end of its cycle, said master apparatus comprising means controlled by master apparatus time for stopping the secondary apparatus, and for starting the secondary apparatuses after they have been stopped by the master apparatus, and means controlled by master apparatus time for starting the secondary apparatuses after they have been stopped by the secondary apparatuses themselves at the end of their cycles, said system having but a single circuit between the master and secondary apparatus, said secondary apparatus stopping means comprising means for increasing the resistance of the secondary motor circuit to prevent normal voltage from operating the motor, and said means for starting the sec-, ondary apparatus after it has been stopped at the end of its cycle including means controlled by the master apparatus for increasing the voltage for the secondary apparatus motor sufficiently to start it notwithstanding the increased resistance, said resistance-increasing means comprising a switch controlling the circuits for the secondary motor controlled by the movement of said motor, and a resistance in bridge of said switch.

5. In a job time recorder system, master apparatus, a plurality of synchronous motor time controlled recorders, means in said master apparatus for stopping said recorders at the beginning of each of a plurality of non-working periods and for starting said recorders at the termination of each of said non-working periods, and means for periodically synchronizing said recorders to correct for differences in starting and stopping rates of the synchronous motors, said system controlled entirely over a single circuit connecting said master apparatus and said recorders.

ADOLPI-I L. DENNISTON.

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