US2463371A

US2463371A - Time delay motor control system

Info

Publication number: US2463371A
Application number: US628490A
Authority: US
Inventors: Howard M Fleming
Original assignee: Monroe Calculating Machine Co
Current assignee: Monroe Calculating Machine Co
Priority date: 1945-11-14
Filing date: 1945-11-14
Publication date: 1949-03-01
Anticipated expiration: 1966-03-01

Description

March 1949- H. M. FLEMING 2,463,371

TIME DELAY MOTOR CONTROL SYSTEM Filed NOV. 14, 1945 INVENTORI 08111117802149 BY MTA/ESJ" 6. 60 ,Clmtnomrya o I afforrm s Patented Mar. 1, 1949 TIIWE DELAY MOTOR CONTROL SYSTEM Howard M. Fleming, West Orange, N. J., assignor to Monroe Calculating Machine Company, Orange, N. J., a corporation of Delaware Application November 14, 1945, Serial No. 628,490

3 Claims. (Cl. 318-485) The invention relates to time switches adapted for use with motor operated calculating machines, wherein a spring-retracted operating key upon depression operates a switch to close an electric circuit and start the machine in operation, an object of the invention being to provide means whereby at the end of a predetermined time following release of said operating key the switch will be reversely operated to open the electric circuit and stop the machine; or alternatively in the event the operating key is held depressed for a predetermined unreasonable length of time, the switch will be reversely operated to open the circuit and stop the machine. Other objects and advantages will appear hereinafter or will be obvious.

The invention consists in the novel construction and combinations of parts as hereinafter set forth in the claims.

In the accompanying drawings,

Figure l is a side view of the invention as applied, with parts broken away, showing the parts in normal position with the switch opened due to advance of the ratchet wheel from Figure 3 position.

Figure 2 is a view similar to Figure 1, but fragmentary, showing certain of the parts of Figure 1 in the positions assumed upon depression of the operating key to disengage the latch from the clutch lever and to move the latch lever out of the path of the lug of the tripping lever to thereby release the detent lever from the ratchet wheel, this being a momentary position of the parts.

Figure 3 is a view similar to Figure 2, with the ratchet wheel restored by its spring to restore the tripping lever slightly beyond normal, the detent of teeth, nineteen in the present case, a counting pawl 2 of known means for counting the number of cycles engaging said ratchet wheeel to advance it anti-clockwise one tooth for each two cycles, being disengaged from said wheel therebetween, and being driven by gearing 2' from the motor 48. A detent lever 3, fulcrumed at 3' to the stationary framing engages said wheel l to hold its advance, and a coiled spring 4 wound around the hub of the wheel and engaging suitable stops 5 of said wheel and of said framing tends to move the wheel clockwise to restore t to position wherein the counting pawl will engage the first tooth of the wheel.

This counting pawl is mounted eccentrically upon one of the gears 2, and contacts a guide pin, shown in section in Fig. l, to insure its proper operation, all of which is well known.

Depression of the operating key I38 closes contacts l3 located in an electric circuit wherein the motor 418 is located and starts the machine in operation as will be explained, said depression also actuating a lever M1 and disengaging the latch 48 from the clutch lever I50, thereby causing the latter under influence of its spring l5! to be rocked out of engagement with a projection 152 of a pawl E53 pivotally mounted upon the crank arm 55, and causing said pawl under infinance of its spring 856 to be rocked into engagement with a driver gear i5? having driving connection with said motor. During the above described depression of the operating key 138, it engages the tail arm of a latch lever B, fulcrumed at 6' to move said latch lever out of the path of 2. lug i of a tripping lever l, fulcrumed also at 3'.

The tripping lever i has spring connection 3" with said framing, and the detent lever 3 has spring connection 6 with said tripping lever, said lug 7 having engagement with said latch lever, so that when the latter is moved out of the path of said lug 'l' as aforesaid, the detent lever will be momentarily released from the ratchet wheel, whereupon the latter will be restored by its spring 4 to position wherein the counting pawl will engage the first tooth of the wheel from any posi tion of advance thereof, and during this restoration a lug 9 of the wheel I will engage an arm of the tripping lever 1 to restore it, at the same time tensioning springs 3" and spring 8, which latter will restore the detent lever. The tripping lever i being so restored will be caught and held by the latch lever B which has in the meantime been restored by its spring, due to release of the operating key.

During the calculating machine operation, the counting pawl 2 engages the ratchet wheel I to advance it, the extent of advancement being such as to allow the completion of any legitimate operation before said ratchet wheel is advanced sufliciently to operate the switch lever to be described to break the electric circuit and stop the machine.

Thus there will be periodical advance and restoration of the ratchet wheel during successive calculating machine operations.

In the event that a predetermined interval of time should elapse subsequent to release of the operating key I38 in a calculating machine operation, the ratchet wheel I will during this time have been advanced to a position wherein the counting pawl will engage between the seventeenth and eighteenth teeth of said wheel, in which position a lateral stud Ill of the wheel will engage a cam ll" of and actuate a switch lever ll, fulcrumed at H" and having an insulated roller l2, to open the contacts l3 against the tension of the spring thereof and break the electric circuit to the motor. After the circuit is broken as stated the counting pawl 2 will come to rest in position disengaged from the ratchet wheel I, due to the coasting of the motor.

Or, in the event the operating key I38 should be held depressed, the ratchet wheel I will be similarly advanced, the electric circuit to the motor similarly broken and the machine will be stopped, the reason for this being that thelatch lever B will remain moved out of the path of the lug 1' of the tripping lever, whereas said tripping lever will have been restored by the spring 4 and will restore the detent lever 3 into engagement with the ratchet wheel, the tripping lever so restored having its lug I caught and held by a second latch lever l4, fulcrumed also at 6, the two latch levers having spring connection l5 tending to hold them together with the free ends of their overlying arms in contact and latch lever l4 having a spring i6 tending to restore both latch levers.

During the actuation and the restoration of the tripping lever 7, the lug 7' thereof will move between the free ends of the overlying arms of the two latch levers, which free ends will be spaced apart to enable said lug to enter between them by contact of said lug with the latch lever It just prior to actuation of the tripping lever 1 by its spring 8 consequent upon depression of the operating key and actuation of the latch lever 6.

This contact of the lug I of the tripping lever with the free end of the latch lever i4 is due to the overlap or extension of the lower face of the free end of the latch lever 14 towards lug I and beyond the upper face of free end of the latch lever B.

I claim:

1. A time switch for motor operated calculating machines having an electric circuit through the motor, a switch in said circuit, cyclically operable registering means, registration control means comprising an operating key, and means controlling said switch adapted upon operation of said key to close the circuit and to automatically break the circuit and stop the machine at the end of a given time interval comprising a ratchet member, means on the ratchet member engaging said switch to break the circuit, a spring tending to restore the ratchet member, detent means for the ratchet member, means for releasing the detent means upon operation of said key to cause restoration of said ratchet member by its spring, and a counting pawl driven by the motor and engaging the ratchet member to advance it and tension its spring during said time interval.

2. A time switch for motor operated calculating machines having anaelectric circuit through the motor, a switch in said circuit, cyclically operable registering means, registration control means comprising an operating key, and means controlling said switch adapted upon operation of said key to close the circuit and to automatically break the circuit and stop the machine at the end of a given time interval comprising a ratchet member, means on the ratchet member engaging said switch to break the circuit, a spring tending to restore the ratchet member, detent means for the ratchet member, a latch for the detent means, said key in its operation engaging said latch to release it to momentarily release said detent means and cause restoration of said ratchet member by its spring, and a counting pawl driven by the motor and engaging said ratchet member to advance it and tension its spring during said time interval.

3. A time switch for motor operated calculating machines having an electric circuit through the motor, a switch in said circuit, cyclically operable registering means, registration control means comprising an operating key, and means controlling said switch adapted upon operation of said key to close the circuit and to automatically break the circuit and stop the machine at the end of a given time interval comprising a ratchet wheel, means on the ratchet wheel engaging said switch to break the circuit, a spring tending to restore the ratchet wheel, a tripping lever having a spring connection with the stationary framing, a detent lever engaging said ratchet wheel and having spring connection with said tripping lever, a latch lever engaging said tripping lever and having spring connection with said framing, said key in its operation engaging said latch lever to release it to momentarily release said tripping lever and said detent lever and permit restoration of said wheel by its spring, a second latch lever having spring connection with said framing, the two latch levers having spring connection with each other tending to hold them together, said second latch lever engaging said tripping lever subsequently to its restoration in the event said key is held in effective position during said given time interval, and a counting pawl driven by the motor and engaging said ratchet wheel to advance it and tension its spring during said time interval.

HOWARD M. FLEMING.

I file of this patent:

UNITED STATES PATENTS