US2452359A - Job time recorder system - Google Patents

Description

Oct. 26, 1948. A. 1.. DENNISTON ETAL 2,452,359

JOB TIME RECORDER SYSTEM 3 Sheets-Sheet 1 Filed Feb. 26, 1942 Z Z y m #40401; A dean/37M 1948a A. DENNISTON ETAL 9 3 JOB TIME RECORDER SYSTEM Filed Feb. 26, 1942 3 SheetsSheet 2 Oct. 26, 1948. A. L. DENNISTON ETAL 2,452,359

JOB TIME RECORDER SYSTEM 3 Sheets-Sheet 3 Filed Feb. 26, 1942 IN V EN TORS ADOLPll L. DENJYIJ'T 01V BY SJEHROLD MHRTIN A TTORNEY Patented Oct. 26, 1948 JOB TILIE RECORDER SYSTEM Adolph L. Denniston, Plainfleld, N. J and Samuel Harold Martin, Thomaston, Conn., assignors to General Time Instruments Corporation, New York, N. Y., a corporation 01' Delaware Application February 26, 1942, Serial No. 432,386

This invention relates to improvements in secondary apparatus for time systems. and in particular to an improved corrective mechanism for time recorders which are operated in circuit with a master clock.

In many factories, it is the practice to keep a record of the time spent by each workman on a particular job or production order, A job time recorder isprovided for this purpose by means of which the workman records on a card the time he starts a Job and the time hefinishes a job. These time recorders may preferably form a part of a corrective time controlled system; that is, the operation of the Job time recorder as well as other secondary mechanisms such as clocks, in and out recorders, and program instruments is controlled by a master clock in circuit therewith. An example of such a system is disclosed in the co-pending application, Serial No. 287,518, filed July 31, 1939, by R, L. Lorenz, Ernest S. Ostler and Adolph L. Denniston, now Patent No. 2,332,- 828, granted October 26, 1943.

The time spent by the workman on any particular job may be determined by subtracting the starting time from the finishing time, which times have been recorded on a card, as above mentioned. If a scheduled lunch or rest period has occurred betwen the starting and the finishing, it is obvious that a deduction must be made for this non-productive time.

Due to the fact that the time clerk may overlook the necessity of making this deduction, it has been the practice to disconnect the time recorder from the time system during such non-productive periods. This may be done automatically by a program instrument. Job time recorders which are to be so disconnected are commonly provided with type wheels which indicate the elapsed time since the beginning of the work day, rather than those which indicate the time of day.

Such job time recorders, in the past, have not formed a part of a corrective time system for the reason that a primary function of acorrective system is to cause any recorder or other secondary forming a part or said system to pick up the time that has been lost due to disconnecting the same from the system. It has been the practice to connect such job time recorders into a non-corrective circuit so that after, "they have been disconnected for a half-hour or other period, they will continue to run half an hour behind the master.

A primary object of this invention is to provide a corrective secondary mechanism which can be disconnected from a time system for a predetermined period after which it will continue to 11 Claims. (CI. 58-24) function as a corrective secondary without picking up the time lost by such disconnecting.

A further object is to provide for a job time recorder, an improved corrective secondary mechanism.

A still further object is to provide a job time recorder which can be connected into a corrective circuit of a time system, and which will not record the elapsed time during certain predeter= mined non-productive periods.

Other objects, features and advantages will 9. pear as this description proceeds,

With reference now to the drawings in which like numerals designate like parts Fig. 1 is an elevation of the secondary mech anism of a job time recorder which constitutes a preferred embodiment of this invention. Ger tain parts of the mechanism are broken away for the purposes of clarity;

Fig. 2 is a plan view of the mechanism shown in Fig, 1;

Fig. 3 is an elevation oi the time disc, shown in Figs. 1 and 2, the time disc being adjusted for a half hour cut-out period;

Fig. 4 is an elevation of the time disc which has been adjusted for a forty-five minute cut-out period;

Fig. 5 is an elevation of the time disc as shown in Fig. 4, but in a changed position;

Fig. 6 is an elevation of the time disc which has been adjusted for two forty-five minute cut-out periods;

Fig. 7 is an elevation of the time disc as shown in Fig. 6 in changed position;

Fig. 8 is a sectional elevation of the time disc taken along line 8-8 of Fig. 3;

Fig. 9 is an enlarged sectional elevation taken along line 9-9 of Fig. 5;

Fig. 10 is a section taken along. line iil--l0 of Fig. 2;

Fig. 11 is av section similar to that shown in Fig, 10 with the parts in changed position; and

Fig. 12 is a schematic diagram of a corrective time system incorporating mum-hour recorders and other secondary devices.

Referring now to Figs. 1 and 2, the reference numerals l5 and i6 designate two plates on which the secondary mechanism is mounted, these plates being held in spaced relationship to each other by means of spacers I7. Two coils, i8 and I9, which constitute an electromagnet, are suitably mounted with respect to the side plates i5 and 46, the coils being provided with pole pieces 20 and H. An intermediate plate 22 is disposed between the side plates l5 and I6, and extends 3 between the coils l8 and I3, this plate 22 being suitably mounted with respect to plate it by spacers 23 as shown in Fig. 2.

An armature 24 is provided for cooperation with the pole pieces 20 and 2|, the armature being made up of a plurality of laminations which are held together by means of the two yoke-shaped plates 25. The yoke-shaped plates 25 are provided with suitable lugs 28 which engage the top and bottom laminations, and rivets 29 serve to hold the assembly together. Rigidity is imparted to the assembly by means of the tie rod 21 which passes through and is secured to each of the plates 25. A shaft 30 is Journalled in the side plates l and I6, and the yoke-shaped plates or armature holders 25 are secured to the shaft 3| Both the shaft 30 and the tie rod 21 are extended through plate I 6, the plate being provided with a suitable slot 3| to permit rotation of the armature assembly.

Mounted on the shaft 30 and the tie rod 21 exteriorly of the plate I3 is an arm 32 which carries at one end a pawl 33. A ratchet wheel 34 is mounted on a shaft 35 which is Journalled in the side plates l5 and I6, the ratchet wheel being disposed exteriorly of the plate l6 so that it may be engaged by the pawl 33. A gear 36 is secured to the shaft 35 which meshes with another gear 38 mounted on a shaft 31. The latter shaft is journalled in the side plates l5 and 6 and is disposed immediately beneath the shaft 35. A plurality of type wheels, which are generally designated by the reference numeral 39 are mounted on the shaft 31.

A spring 40 extends between the pawl 33 and the arm 32 and serves to urge the pawl into engagement with the ratchet wheel 34. A locking pawl 4| is also provided for cooperation with the ratchet wheel, the locking pawl being mounted on a pin 42 which extends inwardly from a plate 43. The plate 43, which is partially broken away in Fig. 1, may be suitably secured with respect to the plate |6 by spacer means not shown herein. One end of a. spring 44 engages the locking pawl 4| and the other end is secured to the plate 43, so that the locking pawl will be urged against the ratchet wheel. An operating spring 58 is provided for the armature assembly, one end of the spring engaging the arm 32, and the other end being ailixed to the plate 43.

In operation it will be seen that when the coils l8 and I9 are energized, that the armature assembly, comprising the armature 24, the yokeshaped plates 25, and the arm 32, will be rocked in the counter-clockwise direction, as shown in Fig. 1, against the tension of the operating spring 58. This causes the pawl 33 to be drawn over one tooth of the fifteen tooth ratchet wheel 34. When the coils l8 and I9 are deenergized, the operating spring 58 causes rotation of the assembly in a clockwise direction, thereby rotating the ratchet wheel for one-fifteenth of a revolution. The Inching pawl 4| serves to prevent counter-clockwise rotation of the ratchet wheel 34 as the pawl 33 is retracted during energization' of the electromagnet.

If the coils l8 and I3 are energized once every minute, it will be seen that the ratchet wheel 34 is driven thereby at a speed of four revolutions per hour. The gears 36 and 38 are so proportioned that the shaft 31 upon which the type wheels 39 are mounted, is caused to rotate at a speed of ten revolutions per hour.

A rock shaft 45 is suitably journalled in the sid plat s l5 and I 6. and a plate 46 is sui ly mounted on the rock shaft by means of a hub 41. A small permanent magnet 43, in the shape of a horseshoe, is secured to the plate 46. by means of a small overlying plate 49, and a screw 53 which takes into the plate 46. A plurality of pins 56 project from the surface of the plate 43 and engage the permanent magnet 43 to hold it in a predetermined position with respect to the plate 46.

A strip of magnetic material 5| is secured to the intermediate plate 22 as shown in Fig. 2, one end 52 of said strip embracing the pole piece 20, and the other end of said strip being bent over to form an auxiliary pole piece 53. This auxiliary pole piece extends between the north and south poles 54 and 55, respectively, of the permanent magnet 48.

The coils l3 and i9 are so wound that when energized by a current of normal polarity the pole piece 20 is the south pole, and the pole piece 2| is the north pole. Thus, the permanent magnet is vnormally in the position as shown in Fig. 10 wherein the north pole 54 of the permanent magnet 48 is attracted by the pole piece 83. However, when the coils i8 and i9 are energized by a current of reversed polarity, it will be seen that the pole piece 20 and the auxiliary pole piece 53 are both north poles, and the rock shaft 45 is caused to rotate in the clockwise direction due to the attraction of the south pole 55 by the pole piece 53 which is of the opposite polarity.

An arm is secured at one end to the armature 24 and its opposite end terminates at a point above the rock shaft 45. A rock plate 6| is secured to the rock shaft 45 by means of a hub 62, and is provided with a bent-over lug 63 which is adapted to engagethe arm 60. When the coils l8 and I3 are energized bya current of normal polarity, the lug 63 will be clear-of the arm 60, thereby permitting operation of the armature 24. But when the coils i8 and is are energized by a current of reversed polarity, the rock plate 6| is caused to rotate from the position shown in Fig. 10 to the position shown in Fig. 11 so that the lug 63 engages the arm 30 and the armature assembly is locked in its at- -versed polarity will therefore have no effect upon the "armature, and the ratchet wheel 34 will not be advanced by said impulses.

Journalled in plates is and 22 is a shaft 65 which carries a gear 66 exteriorly of the plate i6. A pinion 61 is mounted on the shaft 35, and meshes with an idler gear 66 which in turn is mounted on a stub shaft 69 secured to the plate IS. The gear 66 meshes with the idler gear 66 so that the shaft 65 is driven from the shaft 35, the gears being so proportioned that the shaft 65 normally rotates at a speed of one revolution per hour.

The operation of the armature locking means is additionally controlled by a time disc, indicated generally by reference numeral I0, which is mounted on the shaft 65. The time disc, as

shown in Fig. 8, comprises a hub H which is provided with an extension in the form of a sleeve 12. A disc 13 is secured to the sleeve 12. Plates (4 and I5, each in the form of asector, are rotatably mounted on thesleeve 12, at' either side of the disc 13. A washer 16 is positioned "on the sleeve 12 exteriorly of the plate I5, and the sleeve is upset as indicated at H, to hold the assembly together. The hub H is provided with a setscrew 18 extending therethrough so that the position of the disc 13 may be fixed with-respect to the shaft 65. The disc maybe keyed to the sleeve 'ings.

II, or otherwise associated therewith in nonrotatable relationship. The disc is provided with three slots 88, 8| and 82, which are disposed at 90 from each other. The disc is also provided with a 'series of apertures 88, which cooperate with stamped depressions 84 and 85 formed in the plates 14 and 15. It will be seen from an inspection of Figs. 3 through 7 that the position oi the plates 14 and may be shifted so as to block-out one or more of the slots 88, 8| and 82. The depressions 84 and 85 cooperate with one or the other of the apertures 83 so that the plates will be maintained securely in their adjusted positions.

The plate 8| is provided with a bent-over lug 88, which lug is adapted to drop into one of'the slots 88, 8| or 82 as the time disc is rotated, providing that the coils I8 and I9 are actuated by an impulse of reversed polarity. The purpose of the time disc is to prevent the operation of the armature locking mechanism which comprises the rock plate 8| and the permanent magnet 48, except during certain positions of the time disc. These positions, of course, are determined by the times during which one of the slots 88, 8| or 82 are opposite the lug 88.

The secondary mechanism herein described is adapted to be, connected into the corrective circuit of a time system such as shown schematically in Fig. 12 of the drawing and as fully disclosed in the above mentioned application. Since such a system is fully disclosed in the aforementioned application, only a brief explanation of the apparatus and operation of same will be given herein.

Referring to Fig. 12, the system includes the master apparatus comprising a master clock incorporating the contacts I33, I89, i32 and I49,

' rality of secondary devices such as indicated at S-I and 8-2 which may be secondary clocks, in and out recorders, time stamps or other devices of this kind. Such secondary devices are connected to the secondary circuit comprising conductors I83 and I64. The system also includes a plurality of num-hour recorders of the type disclosed in Figures 1 to 11, inclusive, of the draw- These hum-hour recorders are connected to the secondary circuit comprising conductors III and H2, the magnets I9 of num-hour recorders being connected in parallel to such conductors.

Referring now to the schematic circuit diagram of Fig. 12, the contacts I33 are closed by the master clockonce each minute, thereby completing a circuit from the negative side of the supply source, contacts I33, conductors I34 and I I44, winding of magnet I45, to the positive side negative side of the supply source. This impulse is also transmitted from conductor ISI over conductor I82, winding of operating magnet i88 of the program instrument I83 and over conductor |8| to the other side of the secondary circuit.

These minute impulses as transmitted over the secondary circuits also are transmitted over the circuit to the hum-hour recorders through switch -II8. This condition exists as long .as the numhour recorders are in phase with the master clock and 'the other secondary devices. The minute impulses transmitted'over these circuits are of normal polarity until contacts I49 are closedby the master clock at approximately 52 minutes and seconds after each even hour position. Closure of these contacts completes the circuit from the negative side of the supply line, contacts I48, conductor I58, winding of relay I54, to the positive side of the supply line. Relay I54 operates, opening the back contacts and closing the front contacts I56 and I51. This reverses the connections from the supply source to the secondary circuits and as long as relay I54 is in energized position, impulses of reverse polarity are transmitted over the secondary circuits each time the impulsing relay I45 operates to close its contacts I41. The manner in which the secondary devices are locked by such reverse impulses when each device reaches its 59th minute position is fully disclosed in the above mentioned Lorenz et a1. application.

Shortly after the 59th minute position of the master clock, for example, at 59 minutes and 12 seconds after the even hour position, contacts I69 are closed by the master clock to complete a circuit from the negative side of the supply line, contacts I68, conductor I18, winding of relay I12, to the positive side of the supply line. Relay I12 operates, closing contacts I13 and completing a circuit from the negative side of the supply line, contacts I32 which are completed once every two seconds by the master clock, conductor I84, contacts I13, conductor I44, winding of relay I45, to the positive supply line. Relay I45 is operated once every two seconds over this circuit, thereby transmitting a series of rapidly recurring impulses over the secondary circuits. These impulses rapidly advance any secondary device which may be slow and therefore has not yet reached and become locked in its 59th minute position. Contacts I69 are opened by the master clock at approximately 59 minutes and 48 seconds after the hour, thereby stopping thetransmission of the fast impulses. Also, at approximately 59 minutes and 50 seconds after the hour, the contacts I48 are opened, thereby opening the circuit to relay I54 and allowing this relay to release. Release of relay I54 again reverses the connections between the supply source and the secondary circuit, thereby restoring these connections to their normal condition so that the th minute impulse will be transmitted over the secondary circuits with normal plurality, advancing all secondary devices from their locked position.

The program instrument I83 is connected directly across the secondary circuit as previously stated and is thereby kept in synchronism with the master clock in the same manner as the other secondary devices, such as S-I and S2. This program instrument is of the usual tape type, including a tape I84 which controls contacts I85 by means of holes punched in the tape in accordance with a predetermined schedule. Operation of the contacts I85 causes energization of the winding of a solenoid switch I88 having con- 7 opened at 12 o'clock. Thus these recorders will not receive the normal minute impulses during this cut out period. The switch I ill will be closed at 12:30 again connecting the nuni-hour record- -ers in the secondary circuit so they will resume their timed operation which, in this case, will be one-half hour out of phase with the master clock. The manner in which the master apparatus just described controls the num-hour recorders for various cut out periods will now be described in connection with Figures 1 through 11, inclusive.

The pawl and ratchet mechanism, 33 and 24, cause the mechanism to be advanced step by step by each minute impulse through a cycle of operation which corresponds to the cycle of operation of the master clock. During each cycle, the secondary mechanism moves through a locking position, that is a position in which one of the slots 80, BI or 82 is opposite the lug 86. As pointed out above, the secondary will be locked in this position if a locking impulse is received at this time, and it will remain locked inthis position and will not be advanced until a non-locking impulse or an impulse of normal polarity is received by it.

When the secondary is on time, that is, when it is in phase-sychronism with the master clock, the secondary will be locked only during the transmission of the rapid impulses; this is during the 59th minute in the system above referred to. f

If the secondary is slow, it will not be locked until it has been advanced by the rapid locking impulses to the 59th position, and then it will be locked in that position until the 60th impulse unlocks the armature. If the secondary is fast, it will be locked in the 59th position by one of the locking impulses which precedes the rapid impulses. In the system above referred to, the 52nd through the 59th impulses are looking impulses, so the secondary will be corrected if it is not more than seven minutes fast.

The slots 80, 8i and 82 are so arranged that the cycle of operation of the secondary may be shifted with respect to the cycle of operation of the master clock. If the plates 14 and 15 are adjusted to cover the slot 8i, and if the secondary is disconnected from the corrective circuit for half an hour, it will be seen that when the secondary is again connected into circuit it will be one-half hour slow. This one-half hour represents the non-productive period, or as it might be termed, the disconnected interval, the recording of which is not desired.

Before the disconnected interval, correction is effected during the 59th minute of each hour by the dropping of the lug 86 into the slot 80 as shown in Fig. 11. After the disconnected interval, the slot 82 will be opposite the lug 86 during the 59th minute of each hour, if the secondary is on time, and the secondary will be locked in the desired position (half an hour slow) during the transmission of the rapid impulses. Similarly, if the secondary is a few minutes fast or slow, correctionv will be efiected with respect to the slot 82, as shown in Fig. 3.

But if the slot 82 were covered so that correction could be effected only with respect to the slot 80, the armature 24 would not be locked during the 59th minute, and the secondary would be advanced by the rapid impulses, and the disconnected half hour would be picked up and recorded by the type wheels. This is the reason why secondaries with only one corrective position, or only one slot or notch, must be connected into 8 a non-corrective circuit after the disconnected interval.

The type wheels 38 comprise a blank wheel 00, a tenths of an hour wheel 9i, an hour wheel 92. and a ten hour wheel 93, this arrangement being adapted to operate for 20 hours out of each 24. Of course, if it is desired to connect the recorder to the time system for 8, 16-, or 22 hours or any diflerent period of time, the proper sized wheel may be substitutedfor wheels 92 and 92. The blank wheel 90 is secured to the shaft 37 and rotates with the gear 38 at the rate of ten revolutions per hour. The tenth of an hour wheel Si is advanced one step by each revolution ofthe wheel 90 by the usual carry-over mechanism not shown herein, and the wheels 92 and 93 are advanced by their preceding wheels in a like manner. The blank wheel 90 is provided so that the printing position of the first printing wheel 9! of the series will not be affected by any variation in the relative position of the ratchet 34 and the pawl 33 during consecutive operations, nor by any tendency'of the ratchet to creep when the smeture 24 is in its attracted position.

In operation, the secondary mechanism, including the ratchet wheel 34 and its associated parts, are normally advanced step by step by the impulses transmitted by the master clock over the corrective circuit, the armature being free to operate as shown in Fig. 10. The type wheels 89 will be advanced every sixth minute to record the time elapsed since the beginning of the work day.

If, however, an uncovered slot in the time disc 10 is opposite the lug during the transmis sion of a locking impulse, the armature will be locked in its operated position as shown in Fig. 11. This position of the secondary mechanism as a whole may be termed the chronologically synchronized position inasmuch as at the end of the 59th minute, the position of the secondary is synchronized with that of the master clock, irrespective of the relationship of their positions when the armature 24 is first locked, provided that this relationship does not exceed the maximum fast or slow correction of the system :and of the particular secondary. The armature is unlocked by the 60th impulse, which may be termed the synchronizing impulse, and the operating spring 58 causes the mechanism to be advanced one step.

As pointed out above, when the plates 14 and 15 of the time disc 70 are adjusted to cover slot 8|, the secondary is caused to shift its chronologically synchronized position after a disconnected interval of half an hour from that shown in Fig. 11 to that shown in Fig. 3. I

If a disconnected period of forty-five minutes is desired, the plates may be adjusted to cover slot 80, as shown in Figs. 4 and 5. For instance, the chronologically synchronized position of the secondary at some time in the morning,say at 11:59, is shown in Fig. 4, and if the recorder is disconnected during a lunch period from 12:00 to 12:45, by 12:59 the time disc will have advanced only This position is a chronologically synchronized position because, as shown in Fig. 5, the slot 8i is 90 behind slot 82.

It the plates 14 and 15 have been adjusted so that no slot is covered, the chronologicall synchronized position of the time disc at 12:59 p. m. and each hour thereafter until the next cutout period, as shown in Fig. 6, is the same as that shown in Fig. 5, except for the changed position of the plates. The position of the plates as shown in Figs. 6 and 7 permits a second disconnected period of forty-five minutes, say a supper period for the second shift between 8:00 p. m. and 8:45 p. in. After this disconnected interval the time disc will have advanced only 90 at the next synchronizing period, in this case at 8:59 p. m. Thus the slot 80 will be inline with the lug 8B and this chronologically synchronized position at 8:59 p. m. is shown inFig. 7.

Obviously these disconnected intervals may bear any relation to the chronologically synchronized positions; that is they need not immediately follow them as above described.

At the end. of the work day, the secondary shouldagain be disconnected from the corrective system for a period of one-half hour or fifteen minutes, as the case may be, in order to shift the chronologically synchronized position back again to the slot 80 so that the secondary will again be in the correct position to start out a new day. As the time wheels accumulate only up to twenty hours, as herein disclosed, this disconnected interval should be lengthened sumciently so that the type wheels will be in their position at the beginning of the next day,

It is obvious that-disconnected intervals, other than the thirty minute or forty-five minute intervals above mentioned, may be provided by forming the slots in different positions. For instance disconnected intervals of twenty minutes or forty minutes can be provided by forming the slots 80, BI and 82 at 120 from each other. Similarly, intervals of thirty-five or fifty minutes may be provided. It ma also be desired to have two or more slots in a group, spaced from each other by a distance representing five or ten minute intervals. In this event one plate may cover the whole group, and the plate may be shifted to selectively expose one or the other slots of the group. In the alternative, of course a slot could be provided in one of the plates which would overlap a much wider slot in the disc 13 in order to permit adjustment of five or ten minutes one way or the other. By these arrangements a chronologically synchronized position may be provided for at any five or ten minute division of the hour to take care of various cut-out or disconnected intervals,

if desired, the trailing edge of the slot may have a gradual rise instead of an abrupt rise as shown in the drawing. This will permit the recorder to be advanced by manual operation of the armature even though it is in locked position since the gradual rise of the trailing edge will permit a camming out action of lug 86. This is fully described in the above-mentioned Patent No. 2,332,828.

Although only a preferred embodiment of this invention has been described herein, it is obvious that numerous modifications and changes in the size, shape and proportion of the parts may be made without departing from the spirit of this invention. The above description is illustrative only, and this invention is defined only by the appended claims.

We claim:

l. A job time recorder comprising secondary mechanism adapted to be advanced every minute, means to lock said secondary mechanism in a chronologically synchronized position at predetermined corrective intervals, and means to shift said chronologically synchronized position with respect to said corrective intervals.

2. Secondary mechanism for a job time recorder adapted to be connected into a circuit with a master clock and to be operated by impulses transmitted ever minute, said secondary being adapted to be corrected by a series of rapid impulses which are transmitted every hour by said master clock, and by the receipt of impulses of reversed polarity which "are transmitted every hour by the said master clock so that said secondary will operate in phase synchronism with said master clock, said secondary being provided with locking means which are controlled by received impulses depending upon the phase relation oi ,said secondary to said master clock, and means to shift the phase relationship of said secondary with respect to said master clock.

3. Secondary mechanism for a job time recorder comprising type wheels adapted to be advanced at intervals oi! a fraction of an hour, means to lock said secondary mechanism in a chronologically synchronized position at hourly corrective intervals, and means to shift said chronologically synchronized position with respect to said corrective intervals by an amount which corresponds to a disconnected interval which is not a multiple of said fractional hour intervals at which said type wheels are advanced.

4. Secondary mechanism adapted for operation in a corrective time system comprising an electromagnet, an armature cooperating therewith, a pawl associated with said armature, a ratchet actuated by said pawl, means to lock said pawl against operation when said electromagnet is energized by an impulse of reversed polarity, and means to block said locking means except at certain predetermined positions of said blocking means, said blocking means being driven by said ratchet, and said positions being spaced apart by an amount corresponding to an interval during which said secondary mechanism is adapted to be disconnected from said time system.

5. secondary mechanism for time recording apparatus comprising electromagnet means to advance said recorder step by step upon receipt of electric impulses through a complete cycle of operation, means to lock said mechanism against operation, and means for controlling the operation of said locking means, said control means being driven by said electromagnet means through a corresponding cycle of operation and permitting the operation of said locking means at intervals less than the interval normally required to advance said control means through a complete cycle.

6. Secondary mechanism for time recording apparatus comprising electromagnet means to advance said recorder step by step upon receipt of electric impulses, means to lock said mechanism against operation, and a time disc for controlling the operation of said locking means, said time disc being driven by said secondary mechanism and being provided with a plurality of spaced slots for permitting the operation of said locking means at intervals less than the interval required to rotate said time disc through a complete revolution.

7. Secondary mechanism for time recording apparatus adapted to be connected into an hourly corrective time system comprising electromagnet means to advance said recorder step by step by electric impulses, means operable at hourly intervals to lock said mechanism against operation, and a time disc for controlling the operation of said locking means, said time disc being driven by said secondary mechanism and having portions of its periphery extended so as 11 to bear against said locking means to prevent the operation of said locking means whereby said secondary mechanism may be rotated up to and locked in any one of a plurality of chronologically synchronized positions.

8. A time disc for controlling the operation of a job time recorder connected to a corrective time circuit comprising a disc having a plurality of slots in the periphery thereof, the distance between successive slots in a direction opposite to the direction in which said disc is adapted to be rotated being determined by and corresponding to successive predetermined intervals during which said recorder is adapted to be disconnected from said corrective time circuit.

9. Secondary mechanism for a job time recorder adapted to be connected into a master clock controlled corrective time circuit and to be disconnected therefrom during predetermined disconnected intervals which are less than the corrective intervals as determined by said master clock, said secondary apparatus including electromagnet means-for advancing. the same step by step upon the receipt of electric impulses, looking means and control means therefor, said locking means adapted. to be controlled conjointly by said master clock and said control means in order to lock said secondary apparatus in a chronologically synchronized position with respect to said master clock at said corrective intervals, said control means comprising a rotatable element driven by said electromagnet means through a chronological cycle of operation corresponding to the chronological cycle of said master clock, said rotatable element cooperating with said locking means to permit the shifting of said chronologically synchronized position with respect to said master clock subsequent to said disconnected interval.

10. In a time system including a master clock, secondary mechanism in circuit therewith comprising electromagnet means for advancing the same step by step upon the receipt of electric impulses transmitted by said master clock, elapsed time recording means driven by said electromagnet means, locking means and control means therefor, said locking means adapted to be controlled condointly by said master clock and said control means in order to lock said secondary apparatus in a chronologically synchronized position with respect to said master clock,,said control means comprising a rotatable element cooperating with said locking means and driven by said electromagnetic means through a chronological cycle of operation corresponding to the chronological cycle of said master clock, said cycle including a plurality of positions corresponding to times during which said locking means are not rendered inoperative by said control means,

whereby said chronologically synchronized posi-- tion may be shifted with respect to said master clock so that a predetermined interval during which said secondary mechanism is disconnected from said master clock will not be recorded by said elapsed time recording means.

11. Secondary mechanism for a Job time recorder adapted to be connected into amaster clock controlled corrective time circuit and to be disconnected therefrom during predetermineddisconnected intervals which are less than the corrective intervals as determined by said master.

clock, said secondary mechanism including electromagnet means for advancing the same step by step by electric impulses transmitted by said master clock, type wheels driven by said electromagnet means, locking means for said electromagnet means, control means operating conjointly with said impulses to cause said secondary apparatus to be locked in a chronologically synchronized position with respect to said master clock at said corrective intervals, and operating at other times to render said locking means inoperative,. said control means comprising a rotatable elementdriven by said electromagnet means through a cycle of operation, which includes a plurality of positions representing times during which said locking means are not rendered inoperative by said control means, successive positions in a direction opposite to the direction of rotation of said rotatable element being spaced apart by distances representing successive intervals of said predetermined disconnected intervals whereby said chronologically synchronized position may be' shifted with respect to said master clock.

ADOLPH L. DENNISTON. S. MARTIN.

REFERENCES CITED The following references are-oi record in the file of this. patent:

UNITED STATES PATENTS Lorenz et al Oct. 26, 1943

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