US2340279A

US2340279A - Recorder

Info

Publication number: US2340279A
Application number: US371618A
Authority: US
Inventors: Charles F Wallace
Original assignee: Wallace and Tiernan Inc
Current assignee: US Filter Wallace and Tiernan Inc
Priority date: 1940-12-26
Filing date: 1940-12-26
Publication date: 1944-01-25
Anticipated expiration: 1961-01-25

Description

Jan. 25,1944. c. F; WALLACE RECORDER '7 Sheets-Sheet l .M ATTORNEY mm AA. @y

www m n www Filed Deo. 26, 1940 l WWW Jan. 25, 1944. l c. F. WALLACE RECORDER Filed Dec. 26, v1940 7 Sheets-Sheet 2 @N a s ANN n i@ T u C N v SN RN m miv.. h. man w E n E. s# IH.. S mx. /l/ l! um Nm )Ill x e lli z! t r Lw n fvwm n n an H FL Nw ww Nw. m l \m.m, $1 ||l NWN 2 1 i. |1110 1 f k 1 l: I lbs. F il z l l NUL @n QQ E M ATTORNEY Jan. 25, 1944. c. F' WAL'LACE 2,340,279

RECORDER Filed Dec. 26, 1940 7 Sheets-Sheet 5 ,INVENTOR q BY i ATTORNEY Jan. 25, 1.944. F.' WALLACE I 2,340,279

RECORDERi Filed Dec. 26, 1940 n '7 Sheets-Sheet 4 v `INVENTOR Y K L9; ATTORNEY Jan. 25, 1.944. c. F. WALLAC y 4 2,340,279

RECORDER Filed nec. 26, 1940 'r sheets-sheet s Jan. 25, 1944. c F. WALLACE 2,340,279

y y RECORDER Filed Dec. 26, 194D 'T Sheets-Shes?l 6 .jigs

, j@ y 125 f5 152 151 4150 10'7 105 10Q V108 V41111 INVENTOR ATTORNEY Jan. 25, 1944. c. F. WALLACE RECORDER Filed Dec. 26. 194Q '7 Sheets-Sheet '7 Www NN MATTOREY Patented Jan. 25, 1944 v RECORDER Charles F. Wallace, Westfield, N. J., assignor to Wallace & Tiernan Products,

Inc., Belleville,

N. J., a corporation of New Jersey Application December '26, 1940, serial No. 371,618 19 claims. (ci. 2x4-36.5)

This invention relates to recorders of the time* interval type, especially adapted for use for recording the signals transmitted by radiometeorov graph transmitters of the time interval type, such as, for example, the radiometeorograph transmitter of my patent application Serial No.

327,767, filed April 4, 1940, the recorder operating in response to electric current impulses from a radio receiver 'receiving the radio signalsfwhich may be radio impulses or interruptions in an otherwise continuous radio signal. corder is also adapted for use in other time interval telemetering systems wherein thel mea- The new resurement to be recorded is indicated bythe time interval between a. synchronizing reference impulse or signal land the signals, or impulses, representing the measurement transmitted; and it is particularly adapted to such systems in which driving motors of the transmitter and the recorder cannot be supplied with synchronous alterhating currentorbe otherwise controlled to maintain absolute uniformity ofl speed between the motors.

The invention aims to. provide an improved time interval recorder having a high speed of operation and great accuracy as compared to suchA recorders heretofore known, and which is reliable in operation and may be made of an over-all size and weight to be readily portable; to provide a recorder having means for readily synchronizing the speed of its operating motor with that visible lto the operator; and to provide a recorder which is portable and light in weight and yet rugged in construction and durable, and especially suited to the rigors of militaryI and similar serv- Other objects and advantages of the new recorder will appear from the' following description.

The invention consists in various features of construction, arrangement;y and combinations of parts whereby the objects and advantages of the invention are attained, all as will be clearly disclosed by the following description in connection with the drawingsand specifically pointed out in the claims. y

A full understanding 'of the invention can best be given by a detailed description of arecorder embodying the various features of the invention in the form now considered best, and such a description Will now be the accompanying drawings illustrating a portablev recorder especially adapted for military and similar service. In said drawingsof the motor of the distant transmitter whose signals are being recorded; to provide a recorder having a stylus which makes only a dot, or mark of minimum length, on the chart regardless of the length of the transmitted signal or impulse, and which is not readily susceptible to operation by spurious impulses; to provide a recorder in which the chart or record sheet is advanced only during the return, or non-printing, stroke of the stylus; to provide a, recorder in which either a dat chart or a rolled chart may be used; to provide means for framing the record, that is, adjusting to position the index marks .on the chart; to provide a recorder having. no relays, motors or other mechanism other than a single motor for advancing the paper and moving the stylus carriage forward and returning it to its initial position at the end of each sweep of the stylus carriage, and a, single magnet for giving the stylus arm its synchronizing and printing strokes; to provide means for the rapid return stroke of the stylus carriage, thus making` possible the receipt of more signals in a given time; Ito provides. recorder making a record Awhich is immediately Fig. 1 is a plan view of the apparatus as it I appears with the cover of the cabinet opened to stand upright and shown in section;

Fig. 2 is a view in elevation of the parts of the apparatus which are mounted on the under sideof the hinged mounting plate, the plate hav--l ing been ,swung up out ofthe cabinet to stand vertical;

Fig. 3 is a sectional view on a larger scale than Figs. 1 and 2 taken on line 3 3 of Fig. 1'; v Fig. 4 is a sectional View on a slightly larger scale than Fig. 3 taken on line 4 4 of Fig. l;

Fig. 5 is a sectional view taken on line 5 5 of Fie. 1:

Fig. 6 is a sectional view taken on line d of v Fig. 4;

Fig. '7 is a sectional view` taken on line l-l of Fig. 3; v v

Fig. 8 is a sectional View taken on line 3 8 of Figs. 2 and 9;

Fig. 9 is a sectional view taken on line 9 9 oi Fig. 8:

Fig. 10 is a sectional view taken online i iii of Fig. 9; and

Fig. 11 is a-wiring diagram.

.Referring to the drawings, the various parte of the Aapparatus are mounted on amounting platelll which is hinged to the rear wall of a cabinet il which has a cover I2 also hinged to its rear wall. Mounted beneath the plate I is a paper feed roller i5 which extends upward through a slot llli in the mounting plate with its upper surface substantially ilush with the upper i given in connection with surface of the plate. The roller is journalled in bracket plates I1 and I8 which extend vertically downward from the mounting plate. The roller is turned manually for adjusting the record sheet, or chart, by means of a finger knob on a shank which extends through the mounting plate and is rotatable therein and has fast on its lower end beneath the mounting plate a bevel gear 2l meshing with a bevel gear 22 fast on the stub shaft 23 which extends from the left hand end of the roller as viewed in Figs. 2 and 5.

The paper is pressed against the feed roller by pressure rolls 25 carried by spring arms extending from a support bar 26 which is pivotally mounted at its ends in .bracket plates 21- and 28 so that the bar may be rocked by means of a finger piece 29 to raise the rolls 25 from the paper. A spring 30- connected to a rod 3l extending from the bar downward through an opening in the mounting plate normally holds the bar rocked and under tension to .press the rolls 25 against the paper or record sheet on the feed roller. The'feed roller has most desirably a knurled or otherwise roughened zone 32 beneath each of the pressure rolls 25. Mounted in front of and extending parallel to the feed roller is a long small-diameiferv hold-down roller 33 which is journalled by having its reduced ends extend into vertical slots 34 in the

bracket plates

21 and 28, one of said slots being shown in Fig. 3. The roller is thus free to rest by gravity on the paper as it advances from the feed roller.

The paper feed roller I5 is given a step-by-step feeding movement by a gear 35 mounted on the shaft 23 of the roller between a shoulder on vthe shaft and a spring spider 36 mounted fast on the shaft and which presses the gear 35 against the shaft shoulder, the gear being thus frictionally connected to turn the feed roller for feeding the paper but -permitting the roller to be turned manually by means of the finger knob 20 without turning the friction gear 35. The gear 35 is driven by a pinion 31 -on a shaft which carries a worm gear 38 meshing with a worm 39 on a shaft 40. Shaft 40 is turned for giving the roller I5 its stepby-step paper feeding movement by means of a pulley wheel 4I which is one of the guide pulleys for the cord which reciprocates the stylus carriage as hereinafter described. This pulley 4I is free to turn on the shaft 40 but carries a pawl 42 engaging aratchet wheel 43 fast on the shaft, whereby when the pulley is turnedA in the direction indicated by the arrow in Fig.,5, the shaft 4I) is turned. When the pulley rotates in the oppositeI direction, the pawl 4.2 slips over the ratchet wheel and the shaft is held against turning in the opposite direction by a back stop pawl and ratchet44. Pulley 4I turns in the direction indicated by the arrow during the return, or nonprinting, strokes of the stylus, and turns in the opposite direction during the printing strokes of the stylus. The. chart is thus stationary during all printing strokes of lthe stylus, and is advanced only during the non-printing return strokes of the stylus.

'hand end of the apparatusas viewed in Fig. 2, is journalled on a stub axle 48 and pressed toward the left by a spring 49 between the end of the roll support and a collar on the stub axle, the stub axle being screw-mounted in the bracket plate I1 and locked .by means of a lock nut as shown in Fig. '7. The roll support 41 at the other or left-hand end of the apparatus is journalled on a stub axle 50 which is screwed into a bearing sleeve 5I set in the bracket plate I8 and which carries a finger knob 52 whereby the stub axle 'may be withdrawn for removal and replacement of] the chart rolls. The paper is threadedbeneath and upward about the feed roller i5 and r through the slot I6 in the mounting plate and forward over the feed roller and beneath the hold-down

rollers

25 and 33. A drag spring 53 bears against the paper roll to prevent over movement.

The printing stylus is carried by a carriage 6U which is mounted to slide back and forth on a track or slideway formed by two parallel bars 8l and 62 connected by

end plates

63 and 64, the slideway unit thus formed being mounted to rock on hollow studs 65 and B6 xed in the bracket plates 21 and '28, respectively. The stylus carriage, as shown, is formed by a metal plate slidably hung on the rod 6I by upwardly extending ears 61 and extending beneath the rod 52 and then .further forward forming an arm 68 which carriesathe stylus at its foward end. In the normal position of the rocker slideway unit, Athe stylus carriage takes the position shown by dotted lines in Fig. 3, the stylus arm being pushed up by a spring-pressed lifting pin 10 mounted in a holder 1I carried by the stylus arm, the pin being urged downward .by a spring 12 to lbear against the chart and push the stylus arm upward, thereby holding the stylus carriage in position with the pen or other stylus point raised clear of the chart as Shown in Fig. 3.

When the slideway unit is rocked from its norvmal position, shown by dotted lines in Fig. 3, to the position shown in Fig. 4, the rear end of the l carriage is raised by the rod 6I and the rod 62 engages the carriageto throw the stylus arm downward against the comparatively light pres.- sure of the spring 12. The rocking movement of the slideway is not sufficient to carry the pen or stylus point down into contact with the chart, but by the inertia of the stylus arm and parts carried thereby the movement of the stylus arm lis continued to move the stylus point into contact with the paper, the carriage plate turning on rod 6I somewhat down away from the rod 62 as shown in Fig. 4. The stylus arm and carriage are then immediately lifted .by the'lifting pin 10 to raise the stylus clear of the chart as shown in Fig. 3, the carriage plate then coming into engagement with the rod 62 if the slideway unit has not been immediately rocked back to its normal position. The stylus thus makes only a momentary Contact with the chart and prints only a dot regardless of the length of the impulse by When charts in the form of separate sheets 4 which the slideway unit is rocked from its normal `position andof the traversing movement of the stylus carriage.

Instead of a stylus of the non-printing type making its marks by pressing a carbon sheel or ribbon against the chart, a printing stylus i: most desirably used and preferably an ink printing stylus, or pen. The pen may be of any suitable form. As shown, the pen 13 extends oui A through a feed opening kat the bottom of an inl reservoir 14 mounted'at the end of the atylu:

arm. the pen point being the lower end of a feed spring 15. The mounting plate has, most desirably, an inlayed platen strip 16 of semi-hard rubber or leather or other suitable material extending longitudinally beneath the path -of the pen. Y

,The slidewayunit is rocked between its normal pen-raised position shown'by dottedlines in Fig. 3 and its printing position shown in Fig. 4 by the armature 11 of an electromagnet 18, the armature being connected by a link 80 to a. stud di extending rom the end plate 63 of the slideway unit. tracted bye, spring 82 to rock and hold the slideway unit in its normal raised-pen position shown in Fig. 3. To provide for adjusting the extent of the downward throw of the pen arm, the link 80 is connected at its armature end to a plate 83 which is under spring tension to move away from the armature and is held in adjusted position by an adjusting screw 84.

The stylusy carriage 60 is moved back and forth on the slideway by means of a cord 80 which extends from the carriage through the hollow stud 65 to a guide pulley 9| atthe extreme right hand end of the machine as viewed in the drawings, thence downwardly to a helically grooved driving drum 92 about which the cord makes several turns. From the driving drum, thecord extends to the guide pulley 4| and thence upward to and around a guide pulley 83 from which it extends through the hollow stud 68 to the stylus carriage. The twoends of the cord are connected toy a split post 84 extending upward from the carriage plate, land for maintaining the cord under suitable tension a spring 95 is connected between the post-84 and the end of the cord at the left hand side of the post. 'I'he drum 921s turned at a predetermined speed to' move the stylus carriage to the right, as viewed in the drawings, to give the stylus its forward, or pinting, movement across the chart, and when the carriage has completed this printing movement, the drum is rotated rapidly in the opposite direction to cause a quick return non-printing movement of the carriage to the left; back to its extreme left hand position.

The drum is driven in the direction of the arrow in Fig. 7 for giving the stylus carriage its printing traversing movement across the chart by a motor-driven shaft which is constantly driven and which drives the drum through mechanism shown in Figs. 2, 3, 8, 9 and 10, which will now be described.

In the apparatus shown, and most ldesirably, the motor |0| which drives the shaft |00 isV a governor-controlled,` series type electric motor driving the shaft through a reduction ge'ar unit |02.- A pinion |03 on shaft |00 drives a. large gear mounted fast on a shaft |08 which extends between and is journalled in plates |01v and |08 extending downward from the mounting plate I0. Also mounted on the'shaft |06 e armature 11 is normallyv rement with the inner side of the end of the curved arm to cause the U-spring to rotate with the gearas the gear rotates in the direction of the arrow in AFigs.8 and 10. 4 Y

' The disc ||0 and pinion are thus by the frictional engagementl of the armsof spring ||3 in the groove of the disc caused to turn with the gear |05 when the load on the pinion is not great enough to overcome this friction drive. When the rotation of the pinion is sufficiently resisted, however. the spring arms slip on the disc, sliding in the groove of the disc to provide a smooth uniform tension on the disc and parts driven thereby. When the pinion is again free from the opposing resistance, or load, it is again driven by gear |05 through the U-spring.

The pinion engages a gear |20 ,which is mounted fasten a shaft |2| journalled in the plates |01 and |08. A sleeve |22 free to turn on shaft |2| has fast thereon at one end thereof a gear |23 and has connectedto it at its other end the inner end of a coiled spring |24, the outer end of which is connected to an anchor stud |25. 'I'he spring tends to rotate the gear |23 in anti-clockwise direction as viewed in Figs. 8 and 10, that is, las indicated by the arrow b in Figs. 8 and l0, in the direction opposite to that in which the gear |20 rotates. The gear |23 is turned against the ltension of spring |24 by gear |20 from a starting position shown in Fig. 8 for nearly one complete rotation, and is then released and is returned rapidly by spring |24 to its starting position. To accomplish this, vgear |20 has on its side toward gear |23 adriving dog |26, and gear |23 has 20 a pivoted latch |21 which has an arm from the end-of which a stop pin |28 extends through an opening |29 in gear |23, the opening being of such dimension greater than the width of the and a free position as shown in Fig. 10 in which the latch is out of the path of the driving dog.

When gear |23 has been returned to starting position. latch |21 is in its engaging position as shown in'Fig. .8, to be` engaged by dog |26 so that as gear |20 rotates gear |23 is turned with it until the stop pin |28 comes into engagement with the side of. an arm |30.' By this engagement with the .arm |30, pin |28 is by continued movement of gear |23 shifted from one side to the other side of 'the hole |29, thereby shifting the latch |23 to its free position clear of dog |28 as shown in Fig. 10, gear |23 beingI thus released from gear |20 and its rotation stopped. Gear 23 then immediately makes a quick return d ing |29 into engagement with the opposite side but free to turn thereon is a pinion having mounted fast on its hub a disc ||0', the disc and pinion being positioned on the shaft between the gear |05 and a collar ||2. The disc and pinion are frictionally driven by the gear |05 througha U-spring ||3 the two arms of which lie in a groove in the periphery of the disc ||0 and are under tension to press intor said groove, one'arm of the U-spring being curved for positioning the spring on the friction, disc. A pin ||5-extend mg from the side of gear |05 serves by. engage- .y turn movement of and has its outer of the opening, the latch by this movement of pin |28 being shifted backl to its engagingposition to be again engaged by the driving dog as it comes around.

For cushioning the stopping of the quick regear |23 and parts driven by it, the arm |30 is end piston rod of a dash ward turning of gear pivotally connected to the pot |3|. During the forl|23 by gear |20, arm |30 l |32 from' the position shown in Fig. 8` to thatshown in Fig. l0 to withdraw the on its side towardgear pivotally mounted on sleeve |22 Aof the slideway unit upon receipt of 'an indexing dash pot piston. A screw |33 serves as an adjustable stop for limiting this return movement of the arm H30, thus determining the position to which the arm returns during the forward rotation of gear |23, and this position oi' the arm determines thepoint in the forward rotation of gear |23 at which it is released from gear B20, thereby determining the extent of the forward traversing movement of the stylus carriage, as willappear.

vGear E23 drives a pinion |35 on the shaft oit the cord drum 92, the gear and pinion being ot such relative size that the rotation of the drum by theiorward and return rotations of the gear causes the desired traversing -movementso the the positionin which the stylus carriage is held stylus carriage back and forth across the chart,

the carriage being given its forward traversing movement when the gear |23 is driven by gear 20 and being given its quick return movement when gear |23 is released from gear E20 and given its return rotation by spring E24.

After the stylus carriage has been given its quick non-printing return movement, it is held against forward movement, that is, movement to the right in Figs. l, 5 and until released as the result of the receipt of a starting, or referente7 signal from the transmitter Whose measurements are being recorded. The stylus carriage is so held by a latch |40/ extending from a member I|l|| mounted on the bracket 28 which drops over a latch dog\|42 on the stylus arm of the carriage as the carriage comes to the end oi its return movement. The latch by engagement with dog |42 holds the carriage against forward movement from its starting position until a starting signal causes magnet 18 to be energized to rock the slideway unit and tilt the stylus carriage to cause a reference mark to be made on the chart, and by this rocking movement of Vthe carriage the latch dog is moved down out of en sagement' with the latch and the carriage is thereby released.

During the time that thestylus carriage is being given its quick return movement by the return rotation of gear M3, gear |20 has been con' tinuing its rotation. After return movement ci gear |23 has been completed and the stylus carfollows yby the :framing latch |40: having been held 4manually by the operator until 1 thus adjusting the latch |40 in the direction of movement of the stylus carriage on the slideway. .This adjustment of the latch. determines by the latch, that is, its starting position, and thus constitutes a margin adjustment means for determining the position on the chart of the index, or reference, markings. g

For adjusting the tension of the spring |24 by winch the gear |23 is rotated to give the stylus carriage its return movement, the anchor stud it is carried by an adjusting disc |50 fast on a block |5| .rotatably set in an opening inthe plate l0? and in'which one end of shaft |2| has its bearing. The adjusting disc lies againstthe inner side '.of plate |01 and a friction plate |52 is secured to the block |51 by screws |53 and extends beyond the block to bear against theouter side of plate |101. The edgel of disc |50 is toothed or otherwise roughened and is accessible at the lower edge of platel'l (see Fig. 7) for turning the disc. By turning the disc, the tension of spring .|24 may be increased or reduced as desired. The disc is clamped in` adjusted position by a screw operated clamp |54 (Fig. 4).

I'The' operation of the apparatus is briefly as Assuming that the recorder is connected to a radio .receiver receiving signalsfrom a radiometeorograph transmitter which in each .cycle of operations transmits first a reference,

or starting, signal, then one or more signals indicating atmospheric conditions, and finally two closely spaced motor-speed indicating signals; and assuming that the on-and-oif switch |55 of the apparatus is in the -on" position, and that the stylus carriage is at its starting position held The stylus carriage there is a double click of magnet '18, then by the next impulse from the radio receiver, resulting U from the reference, or starting, signal from the riage thereby returned to its extreme left hand .positiom'the drivingdog |26, by continued rota.-

tion of gear |20 comes into engagement with the latch |22 on gear |23. Gear |23 will then moved by gear i120 to cause such forward morre-n ment of the carriage as may be permitted by the latch l40, the latch dog ,M2 having been carried by the return movementof the carriage slightly beyond its latch engaging position. When the i. latch |40 is in holding engagement with the latch dog, however, forward movement .of the carriage and thereby forward rotation of gear |23 are prevented. .The friction clutch between driving gear |05 and disc H0 formed by the U-'spring M3 then'permits gear i105 'to continue its rotation. immediately, however, upon the rocmng y into the member and which may be turned .by means o! a lmurled knob |46, turning the knob radiometeorograph transmitter, magnet i8 is energized to rock the stylus carriage, thereby re- @leasing the carriage from latch |40 and causing .an indexing, or reference, dot to be made on the chart by the stylus. The stylus carriage then ediately starts on its printing stroke across the chart; and as each signal impulse from the radio receiver energizes magnet it during the printing stroke, the carriage/is rocked to cause the stylus to make a dot on the chart at a distance from the reference dotcorresponding to and showing the time' interval between such signai and the starting signal which caused the reference dot; andv iust before the carriage reaches the end of its printing stroke, it is rocked to make two closely spaced dots by the impulses resulting from thel motor-speed-indicating signals sent by the transxriitter.-

I been adjusted to operate at a speedto cause the stylus carriage to make its traversing-movements `approximately `in synchronism with the operating cycles of the transmitter. With the motor so operating, just after the motor-speed-indication has been recorded on the chart, gear |23 is released from'gear |20 by the rockingof its latch E21, and thereupon,y by the A.rapid reverse rotation of gear |23 by spring |24, the stylus carriage is rapidly returned to its starting posi-- tion and' becomes again locked by the framing latch |40. During -this return stroke of the stylus carriage, the paper is advanced one step and then remains stationary until :the next return-movement of the carriage. Afterbeing re'- The driving motor will haveV Vthe index, or reference, dots to be made at the l exact desired position on the chart. This framing adjustment having been once made, the index dots made in successive 'cycles of operations will form a straight vertical line at the left hand side oi' the chart. The motor-speed-indicating dots will then form two vertical lines at the other side of the chart so long as the speed of the recorder motor is in synchronous relationship with the speed of the driving motor of the radiometeorograph transmitter. Any variation in the proper relative speeds of these two motors will be indicated by departure of these vmotor-speedindicating dots from a vertical line. This variance from the proper relative speeds of the two motors may. then be corrected by adjustment of the speed of the recorder motor. The recorder is therefore provided with means for adjustably varying the 'speedof its driving motor 0|.

The synchronizing, or motor-speed-adjusting, means of -the illustrated apparatus is shown in .Figs 1 and 2. The adjustment is effected by adjustment of the motor governor |60 by means of a rod 6| mounted at one end to turn in a bearing block |62 and having its other end threaded and mounted in a threaded opening in a block |83. The rod will thus be moved longitudinally in one direction or the other when turnedin one direction or the other, and by this longitudinal movement of the rod the governor may be adjusted to increase or decrease the sneed of the motor |0| as required to restore synchronism. A click wheel |64 engaged by a click spring |65 holds the rod against unintended turning, and the vclicks indicate to the operator a predetermined speed adjustment. thereby enabling the operator to make the required speed adjustment indicated by a departure 'ofthe sneed indicating dots on the chart from a vertical line. 'I'he rod |6| is turned for adiusting the motor scpeed by means oi' a knob |66 carried by a shank which extends downward through the mounting plate |0 andhas at its lower end a bevel gear |61 `meshing with a bevel gear |68 on a hub mounted on the end of rod |6| and keyed thereto bya pin |69 extending into 'a longitudinal slot- |10 in the rod, so that when the synchronizing knob |66 is turned.rod |6| is turned by the pin |69, the rod being free to move longitudinally because of its slot connection with the pin.

In addition to holding the governor adjusting rod against unintended' turning, the click wheel |64 and spring click |65 serve the further important purpose oi' indicating to the operator the amount of speed adjustment made when le turns the knob |66, each click corresponding to a change in motor speed bearing a definite relationship to a certain observable departure of the motor-speed-indicating marks made on the record sheet from a straight vertical line. The operator can thus, by noting the click when he turns the speed adjusting knob, quickly make a required adjustment of the motor speed.

The electric Wiring of the apparatus of Figs. 1 to is shown in Fig. 11. The double-pole on-off switch |55 is connected to an alternating current power source by means of conductors |80 which may enter the cabinet through a grommet |8| (see Figs. 1 and'2). From the apparatus side of this switch, conductors |82 supply the motor |0| 5 with current, and as this motor is of the series type and equipped with a governor, a. resistor |83 and a condenser |84 are connected across the governor contacts by means of conductors |85 also connected to the apparatus side of the onand--oi switch by means of conductors |9|, and the low voltage secondary of the transformer is connected to a full wave copper oxide rectifier |92 by conductors |93. Across the output or D. C. side of the rectifier |92 there is connected -a smoothing or lter condenser |94 which reduces the alternating current ripple from the rectifier in the well-known manner. The rectier is connected by Wire |95 to one of apair of binding posts |96, and by wire |91, windings of magnet 18, and wire |98 to the other binding post |96. Connection is made from the binding posts |96 by (not shown). Current is thus caused to 'flow through the windings of'magnet 18 whenever the contacts of the radio receiver relay are closed. Magnet 18 may also be operated by means of a local operation switch 20| connected across the binding posts 96.

A paper cut-off groove 2| 0 is provided in the top surface of the mounting plate I0 for convenience in cutting of! a completed part or any desired portion of the record sheet, as by means of a Wheel cutter 2|| which when not in use may be releasably secured -to the inside of the cover of the cabinet by means of a spring clip 2|2.

While most desirably and as in the machine shown, a flat record sheet, or chart, is fed forward in a straight line direction beneath the stylus,

vprising a member by movement of which theV stylus is movedtoward the record sheet and the movement of which stops before the stylus has been moved into contact with'the record sheet,

' the stylus being then free to continue movement by its own inertia into contact with the record sheet, and means for immediately retracting the stylus lfrom the sheet.

2. A recorder, comprising a stylus mounted for traversing forward and back across a record sheet and movable toward the recordv sheet against spring tension, and means for causing the Mrs'tylus to make record-making engagement with the record sheet While making its forward-traversing movement, said means comprising a member by movement of which the stylus is moved toward the record sheet and the movement of which stops before the stylus has been moved into contact with the record sheet, the stylus'being then free to continue movement by its own -inertia into contact with the record sheet and being then immediately retracted from the sheet by saidv spring tension.

and |86. A small step-down transformer is conductors 200 to the relay of the radio receiver features of the invention might obviously be eml, bodied in circular chart recorders or in drum-type 3. A recorder, comprising a slideway, a stylus carriage mounted on said slideway for traversing vforward and back across a'record sheet, a stylus 'toward the record sheet when the slideway is rocked, the rocking movement of the slideway being stopped before the stylus has been moved into contact with the record sheet,'the stylus beine:` vthen free to continue movement under the inertia of the stylus arm into contact with the record sheet and being then immediately retracted from the sheet by said spring-pressed member.

4. A recorder, comprising a stylus mounted for traversing forward on a printing stroke and back on a non-printing return -stroke across a record sheet, motor driven means for traversing the stylus, and means driven by the stylus traversing means for feeding the record sheet during the whole of each successive non-printing: return stroke of the stylus and for holding the sheet stationary during the printing stroke of the stylus.

5. A' recorder. comprising a slideway, a stylus carriage mounted on said slideway, a feedroll for feeding the record sheet..motor driven means for' traversing the carriage forward and back on the Aslideway, means for causing the stylus to make record making engagement with the record sheet while making its forward stroke, means driven 'by the carriage traversing means for turning the feed roll to feed the record sheet forward during each successive non-printing return stroke of the carriage, and for holding the feed roll against rotation during the printing stroke of the carriage, said means including driving' means and a driving worm and -a friction clutch between the feed roll and the worm, and means for turning the feed roll manually to feed the record sheet forward or back at will.

6. .d recorder, comprising a slideway, a stylus carriage mounted on said slideway, a feed roll for feeding a record sheet transversely of the traversing movements of the stylus carriage/lon .the slideway, means for'traversing thecarriage forward and back on the slidewa'y comprising a cord extendingin opposite directions from the carriage and guiding means for said cord including a driving drum about which the cord is wound and means for driving said drum alternately in one direction to drivethe carriage forward on A its printing stroke and in the opposite direction to return the carriage to starting position, a pulley about which said cord turns, and one-way driving means between said pulley and the -feed roll whereby when the pulley is turned in one direction the feed roll is turned to feed the record sheet and when the pulley is turned in the other direction the feed roll is not turned.

7. In a time interval signal recorder having a stylus mounted for traversing forward and back. .across a record sheet and for record making movement: means for holding the stylus against forward movement at its starting position, means for moving the stylus when Vreleased forward across the record. sheet and back to its starting position, and a single vmagnet for releasing the Stylus and for giving' the stylus separate record movement: driving means for giving the stylus its traversing movements including a friction clutch through which the stylus is moved forward on its printing stroke, means'for holding the stylus at its starting position against forward movement by said driving means, and a single magnet for releasing the stylus on receipt of a starting impulse and for giving the stylus its record marking movements.

9. In. a time interval signal recorder having a stylus mounted for traversing forward and back across a record sheet: driving means for giving the stylus its traversing movements including a friction clutch through which the stylus is moved forward on its printing stroke, a latch past which the stylus moves on its return movement positioned to hold the stylus at its starting position against forward movement by saidl driving means, and means for causing the stylus to make a reference mark on the record sheet and simultaneously releasing it from said latch.'

10. In a time interval lsignal recorder having a stylus carriage mounted `on a slideway for traversing forward and back across a record sheet: means lfor rocking the carriage to cause the stylus to vmake a mark on the record sheet, driving means for giving the carriage its traversing movements including a friction clutch through which the carriage is moved forward on its printing stroke, and a latch for holdingthe carriage at its starting position against forward movement by said driving3 means and from which latch the and having a forwardly extending stylus arm:

means for rocking the carriage to causo the stylus to make a mark on the record sheet, driving means for giving the carriage its traversing movements including a friction clutch through which the carriage is'moved forward on its printing stroke, a latch dog on'the stylus arm, and a latch for engagingsaid dog to holdv the carriage atv its starting position against forward movement by said driving means and from-.engagement with which latch said dog is moved when the carriage is rocked to mark the record sheet at the starting position of the carriage. whereby the carriage is released simultaneously with the marking of the sheet and the beginning ofthe Print'- ing stroke of the carriage.

1,3. In a time interval signal a stylus carriagemounted on a slideway: means for traversing the carriage forward and back across the record sheet, said traversing means comprising a constantly operating motor, a rotary member driven by said motor,a second rotary member frictionally drivenby the first said rotary member, a driving abutment on the vsecond said rotary member, a third rotary member mounted coaxially with the second said rotary member, a movable latch memberV can'ied i recorder having sition when released from said driving abut-- ment, means for returning said latch member to its engaging position, anda driving connection between said third rotary member and the stylus carriage whereby the stylus carriage i s moved forward on its printing stroke when the third said rotary member is turned by said abutment and is given a rapid return strokeby the spring return movement of the third said rotary member.

14. In a time interval signal recorder having a stylus carriage mounted on a slideway: means for traversing the carriage 4forward and wk across the record sheet, said traversing means comprising a driving element, a driving member extending from thestylus carriage to said element, a driving motor, and driving connections between the motor and said element including a friction clutch and a rotary member driven Y through the friction clutch and a second rotary member by which said element is operated to move the carriage forward on its printingstroke, and means whereby on each rotation of the rst said rotary member the second said rotary member is given a predetermined rotation and then released, and spring means for causing rapid return movement ofthe carriage when saidsecond rotary member is released from said ilrst rotary member.

A1-5. In a time interval signal recorder having a stylus carriage mounted on a slideway: means for traversing4 the carriage forwardand back across the record sheet, said traversing lmeans comprising a frictionally driven rotary member,

by which the and dash pot member are returned to normal position when the second said rotary member is being turned by the iirst said rotary member.

17. In a time interval signal recorder adapted to make a record in response to signal impulses which in each of successive cycles include first. a starting signal impulse, then one or more condition-indicating signal impulses, and iinally a motor-speed-indicating signal impulse: a stylus mounted for traversing forward and back across a record sheet, means for operating the stylus to make marksron the record sheet in response to said signal impulses, a motor for driving the stylus on its forward printing strokes, a governor for maintaining the speed of said motor constant, means for causing the motor to become effective to move the stylus forward on receipt of a startingsignal impulse, and means for adjusting' the governor to vary the speed of the motor to correct any variation from the desired speed as indicated by the markings made on the record sheet by the stylus in response to the motor-speedindicating impulses.

18. In a time interval signal recorder adapted to make a record in response to signal impulses which in each of successive cycles include first a starting signal impulse, then one or more condition-indicating signal impulses, and finally a motor-speed-indicating signal impulse: a stylus mounted for traversing forwarding and back Y across the record sheet, means for feeding the a second rotary member by which the carriage kis given its forward and back traversing movements mounted coaxially with the iirst said rotary4 member, a driving dog on the rst said rotary member, a pivoted latch member carried by the second said rotary member movable into and record sheet transversely of the traversing movements of the stylus, a motorfor moving the stylus signal impulses for moving the stylus during its' forward strokes into momentary marking engagement with the record sheet, and means for adjusting the speedA of the motor to correct anyvariation from the desired speed as indicated by the marks made on the record sheet by the stylus in response to the motor-speed-indicating impulses.

19. In a time interval signal recorder adapted to make a record in response to signal impulses said rotary member has been turned a predetermined amount by the rst said rotary mem-ber with said driving dog, a spring for turning the second said rotary member backward when released from the rst said rotary member, and an abutment with which saidlatch member part engages to shift the latch member back tov engaging position and to stop the backward rotation of the second said rotary member. at its starting position.

16. A time interval signal recorder as claimed in claim 15, in which the abutments engaged by said latch member part are the opposite sides of a pivoted arm the free end of which is connected to a dash pot member, whereby the stopping of thebackward rotation of the second Asaid rotary member is cushioned. said arm being moved byV which in each of successive cycles include first a starting signal impulse, then one. or more condition-indicating signal impulses, and nally a motor-speed-indicating signal impulse: a stylus mounted for traversing forward and back across the record sheet, means lfor feeding the record sheet transversely of the traversing movements of the stylus, means for moving the stylus on its successive forward printing strokes comprising a motor and a driving train including a friction clutch, electromagnetic means responsive to signal impulses for moving the stylus into momentary marking engagement with the record sheet, means for holding the stylus against forward movement at its starting position and for releasing the stylus in response to the starting signal impulse whereby. a reference mark is made on the record sheet at the start of each printing stroke of the stylus, and means for adjusting the speed of said motor to correct any departure oi' the motor-speed-indicating record on the sheet from a straight vertical line.

CHARLES` F. WALLACE.