US2450996A - Automatic stop mechanism for warpers - Google Patents

Description

Oct. 12, 1948. J. s. SENEY I AUTOMATIC STOP MECHANISM FOR WARPERS 5 Shets-Sheet l 4 Filed March 27, 1947 mm M 5% 55 NE INVENTOR.

(low/v.5.- SEA/Er .z'filzzw ATTORNEY Oct. 12, 1948.

J. S. SENEY AUTOMATIC STOP MECHANISM FOR WARPERS 5 Sheets-Shoat 2 Filed March 27, 1947 IN V EN TOR JOHNS. SEN: Y

A TTORNE Y "J. 5. SENEY AUTOMATIC STOP MECHANISM FOR WARPERS Oct. 12, 1948.

3 Sheets-Sheet 3' Filed March 27, 1947 Oct. 12, 1948. J. 5. SENEY 2,450,996

AUTOMATIC STOP MECHANISM FOR WARPERS Filed March 27, 1947- A 5 Sheets-Sheet 4 I N VEN TOR.

l/OHNi-SENEY 7 BY? Z A TTO PNEY Oct. 12 1948. J. 5. SENEY 2,450,996 Q AU'IOIIA'HC STOP IBOHANISII FOR WARfERS Filed March 27. 1947 5 Sheets-Sheet 5 A mmvron.

; I daMvSSE/VEY ATTQAWEX Patented Oct. 12,1948

AUTOMATIC s'ror MECHANISM FOR WARPERS John S. 'Scney, Richmond, Va., assignor to E. I. du Pont de Nemours & Company, Wilmington, 'Del., a corporation of Delaware Application March 27, 1947, Serial No. 737,585

This invention relates to warpers or the like, and more particularly to an automatic stop mechanism for stopping the warper when a thread in the warp sheet is broken or missing.

An object of the invention is to provide a device of the above type having novel and improved details of construction and features of operation.

Another object of the invention is to provide a stop mechanism of the above type having automatic check means for stopping the machine when the stop mechanism is not in proper operating condition.

Another object of the invention is to provide a stop mechanism of the abovetype including a traveling faller which traverses the thread sheet at regular intervals and is adapted to stop the warper when the space left by a missing thread is encountered.

Another object of the invention is to provide a traveling faller switch of the above type with check means for checking the operating condition of the stop circuit at intervals and for automatically stopping the machine if the stop circuit is not in proper operating condition.

Various other objects and advantages will be apparent as the nature of the invention is more fully disclosed.

The invention is particularly applicable to a slasher, althoughit may be applied to any type of machine including a moving thread sheet consisting of a plurality of spaced, parallel, longitudinal threads. Such a machine is referred to herein as a warper. In one embodiment, the stop mechanism comprises a faller switch including an arm having a head which is sufficiently wide to span two threads of the thread sheet but will pass through the space left by a missing thread. The faller switch is fed transversely across the thread sheet and is held open by contact with the various threads. However, the head is capable of passing through the space left by a missing thread to close the switch. Suitable control mechanism is provided for stopping the machine when this occurs.

In order to permit the taller switch to pass slightly'beyond the end threads of the thread sheet without tripping a pair of end plates are provided adjacent the end threads which engage the taller switch head to hold the switch in open position when in contact therewith. In order to check the operating condition of the stop circuit. one of these plates is provided with a recess into which the head passes to close the switch when in registration therewith. This would normally Claims. (CI. 28-51) stop the machine. However, a check circuit is provided including a cam-actuated check switch driven in synchronism with the travel of the faller switch and arranged so that at the instant the faller switch is in registration with the recess in the end plate, the stop circuit is broken and a check circuit is closed by the cam-actuated check switch. The check circuit is connected to stop the machine if the stop circuit is'not operating properly. Hence, the operator may be assured at all times when the machine is running that the thread sheet is complete and that the stop circuit is in proper operating condition to stop the machine in the event.of failure of any of the threads of the thread sheet.

Although the novel features which are characteristic of this invention are pointed out more particularly in the claims, the nature of the invention will be better understood by referring to the following description taken in connection with the accompanying drawings in which a specific embodiment thereof has been set forth for purposes of illustration.

In the drawings,

Figure l is a perspective view of a portion of a warper with a stop mechanism embodying the present invention. applied thereto;

Figure 2 is a broken front elevation of a portion of a warper showing the thread sheet and the taller switch;

Figure 3 is a detail view of the thread comb and end plate support;

Figure 4 is an enlarged front elevation of the faller switch and end plate;

Figure 5 is a section taken on the line 55 of Figure 4;

Figure 6 is a front elevation of the faller switch;

Figure 7 is a vertical section taken on the line ll of Figure 6;

Figure 8 is a rear elevation of the faller switch;

Figure 9 is a front elevation of the check cam;

Figure 10 is a transverse section taken on the line l0l 0 of Figure 9; and

Figure 11 is a schematic circuit diagram of the stop and check circuits.

Referring to the drawings more in detail, the invention as shown is applied to a warper carrying a plurality of threads l0 forming a thread sheet which, as shown in Figure l. are spaced by an adjustable comb ll, pass over a roller l2, and are individually rolled onto a beam I3. The various details of such a warper and driving means for the thread sheet are well known in the art and only so much thereof is disclosed herein as is necessary to an understanding of the present invention.

The "comb II is adjustably mounted for expansion or contraction in accordance with the number of ends comprising the thread sheet. For this purpose, the comb may be mounted on an expanding bracket I8 (Figure 3) which is adjustably supported on an oscillating arm I8 carrying brackets I8 and I1 which support end plates is and I8. The plates I8 and I8 may be adjusted along the arm I8 and are positioned beyond the end threads of the thread sheet. The plates I8 and I8 are provided with adjustable pads 28 (Figure 2) bearing against a bar 2| which is mounted on the frame of the warper to insure proper clearance for the taller switch. Brackets,

28 and 21 (Figures 1, 2 and 3) are hinged to the end plates I8 and I8 and carry a pair of spaced pressure bars 28 which are adapted to rest against the front of the thread sheet for the purpose to be described. It is to be understood that the comb II and end plates I8 and I8, are oscillated in the usual manner by the arm I8 tor causing the thread to be wound evenly on the beam I3.

In accordance with the present invention, the taller switch is mounted on a plate 38 (Figures 2 and 4-8 inclusive) which is supported and guided for travel in back oi the thread sheet I8 by means of a pair of guide wires 8| which are held under tension in brackets 32 (Fisure 2). Springs 33 engage the plate 38 at the ends of its travel to act as shock absorbers and to assist in reversing the movement of the plate.

Referring to Figures 48 inclusive, the plate 38, which is made of insulating material, is provided with an internal recess 38 in which a shaft 38 is pivoted by means of bushings 31. The shatt 38 carries an arm 88 which carries at its end a head 88 which projects through a slot 8| in the plate 88 to engage the threads I8 of the thread sheet. A contact spring 82, which is attached to the plate 38 by means of a screw 83, makes electrical contact with its arm 38. A leaf spring 88, attached to the plate 88 by screws 88-, bears against the contact spring 82 to urge the arm 38 and head 88 outwardly against the threads I8. A hook 88. to which a feed wire 88 is connected, is threaded into the plate 88 and makes electrical contact with the spring 82. A screw 88, carried in the plate 38 which is mounted on plate 38 as shown in Figure 8 and also in Figure 7. bears against the spring 88 to control the tension on the taller head 88.

The shaft 88 carries a contact arm 88 which may be provided with a cap of suitable contact material, such as platinum. A contact screw 8| is mounted in the plate 88 and is provided with a contact point 88 of suitable contact material, such as platinum. A hook 88 tor a feed wire 88 is mounted in the plate 88 and is electrically connected to the contact screw 8| by means of a contact strip 88.

The arrangement is such that when the head 88 falls through the slot 8|. the. contact arm 88 engages the contact 88 to complete an electric circuit from the wire 88, hook 88, contact strip 88, contact 88, arms 88 and 88, spring 82 and hook 88. to the wire 88. The movement of the arm 88 required to close the contact may be adjusted by means or the contact screw 8|, the contact end of which is tapered for this purpose.

The guide wires 8| are positioned in back of the thread sheet so that the head 88 of the taller switch contacts the various threads I8 and is 7 held inwardly thereby as the switch traverses the 4 thread sheet. The head 88 engages the threads I8 between the pressure bars 28 which impart the necessary rigidity to the thread sheet tor the above purpose.

The wire 88 is wound on a drum 88 (Figures 1 and 2) which is positioned at one side at the cal groove to receive the wires 88 and 88, the ends of which are attached to the drum '88 to prevent slippage. The wire 88 is broken by an insulator 68 which electrically isolates the idler pulley 88. Electrical connections from the stop circuit to be controlled by the taller switch may be made to the idler pulley 83 and the drum 88.

A cam switch comprising a disc 18 (Figures i, 2, 9, i8, 11) is mounted on a shaft 1| which is driven by gears 12 from the motor shaft 8|. The gears 12 have a gear ratio such that the cam disc 18 rotates through about 350 while the taller switch makes a complete traverse of the thread sheet. a

The disc 18 carries an adjustable cam actuator 18 which is adjustably attached to the disc 18 by means of an adjusting screw 18. The cam actuator 18 is adapted to engage a cam follower 11 attached to an actuating arm 18 of a doublethrow switch 18 carried on a supporting plate 88. The cam actuator 18 also actuates the cam tollower 88 attached to the actuating arm 88 of the switch 88.

The disc 18 also carries a cam actuator 8| pivoted by a pin 82 to the disc 18 and which is adapted to engage the cam follower 88 carried by actuating arm 88 of switch 88, also mounted on the plate 88. The actuator 8| is provided with a stop pin 88 which causes the actuator 8| to actuate the cam tollower 88 when the disc 18 rotates in a clockwise direction but permits the arm 8| to pivot about the pin 82 without actuating the cam follower when the disc 18 rotates in a counterclockwise direction. The switch 88 is thus actuated only when the disc 18 rotates in a clockwise direction which corresponds to the return movement of the taller switch.

A plate 82 is journaled about the shaft 1| and is adapted to bear against an actuating arm 88 ot a single pole double-throw switch 88 mounted on the plate 88. The plate 82 is held against rotation by the spring tension of the spring arm 88. A pin 81 carried by the disc 18 is adapted to engage the plate 82 as the disc 18 nears the end of its arc of rotation and alternately shifts the plate 82 onto the spring arm 88, or out of engagement therewith according to the direction of rotation of the disc 18.

The end plate I8 is provided with a slot I88 (Figures 4 and 8) through which a yoke I8I attached to a check plate I82 passes. A plate I83 is secured to the plate I 82 by screws I88 which extend through the slot I88 and holds the check plate I82 for sliding adjustment on the end plate I8. The position ofthe check plate I82 is adjusted by means of a screw I88 extending through a bracket I88 carried by the end plate I8 and provided with a knurled adjusting knob I81. The

.check plate I82 is provided with an elongated recess I88 which is adapted to receive the head 88 of the taller switch and allow the taller switch to close when the head 88 registers therewith. The lateral adjustment provided by the screw I88 permits the groove I08 to be set to receive the head 40 of the faller switch when the taller switch reaches the end of its path of travel, across the thread sheet.

The end plate I8 is shown as carrying a similar contact plate which engages the head 40 of the taller switch at the lefthand end of the thread across the coil I61 for improving the operation of the relay.

sheet. The contact plate is secured to the end plate I 8 in the same manner as the plate I02 above described, and is adjustable to conform for small variations in yarn sheet width, but does not contain a recess to permit the taller switch to b actuated.

Referring to the schematic circuit diagram of Figure 11, alternating current is supplied from -tube I23 having anodes I24 which are connected by leads I25 to a third secondary I26 of the transformer H2. The secondary I26 is center-tapped and is connected to a negative lead I30. The secondary I20 is center-tapped and is connected through a lead I3I, resistor I33, choke I36, resistor I40 and lead I4I ,to the anode I42 of a voltage regulator tube I43. A filter network comprising a resistor I34 and condensers I32 and I35 is connected between the leads I30 and I3I to smooth out the voltage fluctuations.

The cathode I44 of the voltage regulator tube I43 is connected by a lead I45 to the anode I46 of a second voltage regulator tube I41. The cathode I48 of the tube I41 is connected by a lead I49 to a resistor I50 which is connected to the negative lead- I30. The lead I45 is grounded at II.

A potentiometer I55 is provided with an adjustable tap connected by a lead I56, resistor I51, and lead I58 to the control grid I59 of the Thyratron tube H9. The lead I58 is also connected to the contact 54 of the faller switch. A condenser I60 is shunted across the potentiometer I55 for smoothing out the voltage fluctuation. The potentiometer I is designed to supply negative,

' of the double-throw microswitch 19. One contact I 0! the switch 19 is connected by a lead I 66 to the'coil I61 0! a check relay I68, the return side of which is connected through a resistor I69,

return lead I10, and resistor I40, to the positive side oi the condenser I32.

The second contact I15 of the switch 19 is connected by a lead I16 to the coil I11 of a stop relay I18, the return side of which is connected to the return lead I10.

The negative lead I30 is connected to a normally closed contact I of the switch 88, the arm of which is connected by a lead I8I to a normally open contact arm I82 of the relay I68. The arm I82 is adapted to engage a contact I83 which is connected by a lead I84 to the coil I61 01 the relay I88. A condenser I83 is shown as connected The cathode I48 of the voltage regulator tube I 41 is also connected by a lead I88 to the normally open contact I89 of the switch 89, the

. arm 86 of which is connected by a lead I90 to a contact arm |9I of the relay I68, which is normally .closedon a contact I92. The contact I92 is connected to the lead I16 to the coil I11 of the stop relay I18. The stop relay I18 is provided 'with a holding contact I98, the arm I99 of which is connected by a lead 200 to the lead I49, to the cathode I48, and through the resistor I50 to the negative lead I30. A second contact arm 20I of the stop relay I18 is connected to the lead H4. The contact 202 and the lead II3 are connected to leads 203 which supply power to .the warper drive or are connected to a drive control relay.

A control relay 205 is provided with a coil 206,

one side of which is connected by a lead 201 to one side of the power supply line H0, and the other side of which is connected by a lead 208to contact 209 of a centrifugally operated switch 2I0, the arm 2 of which is connected by a lead M2 to the lead I I4, thence'through the switch I I5 to the power supply line H0. ,The switch 2I0 is provided with a centrifugal operating mechanism, indicated at 2I4, which is connected-to be actuated by the warper and is adapted to close the contact 209 when the warper is operating at full speed. A manual switch H5 is connected across the switch 2I0 to permit manual operation of the control relay 205.

Therelay 205 is provided with a normally open contact 2I6 connected by a lead 2" to one side of the power supply line "0 and cooperating with a contact arm 2I8 which is connected by a lead 2I9 to the arm 95 of the double-throw switch 96. The arm 95 cooperates with contacts 220 and 22I which are connected respectively by leads 222 and 223 to control windings 224 and 225 of the motor 62. The windings 224 and 225 are connected by a return lead 226 to the current supply Iine IIO and are so connected that the motor 62 is reversibly operated by the selective v energization of the coils 224 and 225;

The relay 205 is also provided with a normally open contact 230 which is connected by a lead 23I and lead 200 to the cathode lead I48. The contact 230 cooperates with a contact arm 232 which is connected by a lead 233 to the negative lead I30.

Operation In the operation of this circuit, the manual switch H5 is first closed to energize the contact circuit. The warper is supplied with power through the lines 203 and the normally closed contact 202 of the stop relay I18. When the warper reaches top speed, -the.centrifuga1ly operated switch 2I0 closes, thereby energizing the control relay 205 to close the contacts 2I6 and 230. The relay 205 may also be energized for test purposes by the manual switch 2I5 when the warper is not running. The contact 2I6 completes the circuit through the reversing switch 96 to the control winding 224 or 225 of the motor 62 and thereby causes the motor to operate and to drive the drum, 60 for feeding the taller switch across the thread sheet in one direction or the other depending upon the position of the reversing switch 96. The motor also drives the disc 10 in a direction corresponding to the direction'rof feed of the taller switch. In Figure 11,

the disc 10 and reversing switch 88 are positioned F to start the return stroke of the taller, during 7 which the disc 10 will rotate in a clockwise direclion. The closing of the contact 230 completes the circuit from the negative lead I30 to the cathode of the voltage regulator tube I41, thence lo the voltage regulator tube I43, and through the resistor I40 to the positive side of the condenser I32. The voltage across the voltage regulator tube I41 is connected to the potentiometer I55 which furnishes an adjustable negative bias ior the control grid of the Thyratron tube H9. The condenser I50 across the voltage regulator tube I41 helps to stabilize the voltage across this tube. The cathode of the Thyratron tube H9 is connected to ground. The cathode of the voltage regulator tube I43 is also grounded. The potentiometer I55 is adjusted to supply a negative bias to thecontrol grid I59 of the tube II9 suited to block the tube. Upon the closing of the roller switch 50, the negative voltage supplied to the grid of the Thyratron tube is shorted to the grounded cathode, thus dropping the negative potential furnished by the potentiometer I55 to the same potential as the cathode. This allows the gas in the Thyratron tube to ionize and permits the flow of current from the cathode to the anode of that tube, and thence to the common contact arm 18 of the-switch 19.

If the faller switch has been closed with the switch in check position at the end of its travel across the thread sheet when the head 40 of the switch is in registration with the recess I08 in the check plate I02, the disc 10 will also be in check position with the cam follower 11 of the switch 19 engaged by the cam actuator 14 on the disc 10 to close the contact I55, as shown in Figure 11. This completes the circuit from the anode lead I54, switch contact I55, line I55 to the coil I 51 of the check relay I58, thereby actuating that relay and closing its contact I83 to establish a holding circuit through the line I8I, and the normally closed contact I80 of the switch 88 to the negative lead I30. The holding circuit maintains the check relay I58 energized until the contact I80 is momentarily opened by the actuator 14 during the return stroke of the faller switch. Actuation of the relay I58 opens the contact I92 and breaks the energizing circuit to the coil I 11 of the stop relay I18 from the line I90, normally open contact I89 of switch 89 and lead I88 to the cathode of the voltage regulator tube I41, thereby preventing the relay I18 from being actuated when the contact I89 is momentarily closed by the actuator 8| at the beginning of the return movement of the disc 10. If, however, the Thyratron control circuit had failed to actuate the relay I58, the contact I92 would have remained closed and, upon the closure of the contact I89 at the beginning of the return movement of the disc 10, the stop relay I18 would have been energized through the circuit, including contacts I89 and I92. Energization of the stop relay I18 opens the contact 202 and thereby interrupts the circuit from the supply main I I to the warper control line 203 and stops the warper.

If the check circuit is in proper operating condition, the warper remains running and the check relay I58 remains closed until the contact I80 is opened by the actuator 14 before the taller switch and disc have reached the limit of their return stroke. The disc 10 continues to rotate during the return stroke in a direction indicated as clockwise in Figure 11, until the pin 91 engages the right-hand side of the arm 82 and pushes the arm 82 03 of the spring 85, thereby changing the position of the reversing switch 98 and reversing the drive of the motor 82. The faller switch is now driven in its working stroke past the various threads of the thread sheet. During this stroke, the cam 14 is out of engagement with the cam follower 11 and the contact I15 of the switch 19 is closed. This contact sets up the circuit from the anode of the Thyratron tube II9 through the line I18 to the coil I11 of the relay I18, so that the stop relay I18 is actuated in the event that the taller switch contact 50 closes upon reaching the space left by a missing thread and removes the negative bias from the Thyratron tube II9. When the stop relay I18 is thus closed. a holding circuit i set up through its contact I98 and line 200 from the negative lead I 80, which maintains the relay I18 energized until the warper has been brought to rest by opening of the relay contact 202. when the warper is brought to rest, the centrifugally operated switch 2I0 opens, thereby releasing the relay 205 to stop the motor 52 and open the circuit from the negative lead I30 to the voltage regulator tubes. The relay I18, however, remains energized through the resistor I50 and holds the warper control contact 202 open until the power supply to the transformer I I2 i broken by opening the manual switch III. A suitable signal light may be provided, if desired, to indicate that the wraper has stopped operating.

During the checking stroke of the faller switch, the disc 10 rotates in a counterclockwise direction, as shown in Figure 11, until at the end of its stroke the pin 91 engages the arm 92 and again pushes the same onto the spring 95 to actuate the reversing switch 95. At this instant, the cam 14 engages the follower 11 to close the check circuit contact I55. During the counterclockwise rotation of the disc 10, the actuator 8I pivots about its pin 82 on the disc 10 without actuating the switch 89.

A pilot light may also be provided to indicate when the automatic stop mechanism has been manually disconnected from the warper stop circuit so as to warn the operator that manual control 01' the warper is necessary. It will be noted that the faller switch checks each thread of the thread sheet during its check stroke and, on its return stroke, automatically checks the operating condition of the Thyratron tube and control circuits. In the event of a missing thread or of failure of the check circuit, the warper is immediately stopped.

Although a specific embodiment of the invention has been shown for purposes of illustration, it is to be understood that the invention is capable of various uses and that changes and modifications may be made therein as will be readily apparent to a person skilled in the art. The invention is only to be limited in accordance with the scope of the following claims.

I claim:

1. An automatic control for a warper or the like having a moving thread-sheet and driving means therefor, comprising a switch having an actuating head adapted to span two threads of said thread sheet but to pass through the space left by a missing or loose thread, a switch carriage carrying said switch, means mounting said carriage to traverse said thread sheet with the switch normally held open by contact of said head with the threads of said sheet, means causing said head to enter the space left by a missing or loose thread to close said switch, a stop circuit connected to be actuated by the closing of said switch 9 and adapted to stop the thread sheet driving means, means continuously feeding said carriage across said thread sheet in checking and return strokes, and means actuated during the return strokes to test the operative condition of said stop circuit.

2. An automatic control for a warper or the like having a moving thread sheet and driving means therefor, comprising a switch having an actuating head adapted to span two threads of said thread sheet but to pass through the space left by a missing or loose thread, a switch carriage carrying said switch, means mounting said carriage to traverse said thread sheet with the switch normally held open by contact of said head with the threads of said sheet, means causing said head to enter the space left by a missing or loose thread to close said switch, a stop circuit connected to be actuated by the closing of said switch and adapted to stop the thread sheet driving means, means continuously feeding said carriage across said thread sheet in checking and return strokes, an end plate mounted beyond the last thread of said thread sheet to engage said head and having a recess to receive said head for closing said switch at the end of said checking stroke, a cam-actuated switch synchronized with the carriage feed connected to break said stop circuit and set up a test circuit before the head enters said recess, a second cam-actuated switch actuated during the return stroke of said carriage and connected to complete said stop circuit, and means responsive to said test circuit to render said stop circuit inoperative.

3. An automatic control for a warper or the like having a moving thread sheet and driving means therefor, comprising a switch having an actuating head adapted to span two threads of said thread sheet but to pass through the space left by a missing or loose thread, a switch carriage carrying said switch, means mounting said carriage to traverse said thread sheet with the switch normally held open by contact of said head with the threads of said sheet, means causing said head to enter the space left by a missing or loose thread to close said switch, a stop circuit connected to be actuated by the closing of said switch and adapted to stop the thread sheet driving means, means continuously feeding said carriage across said thread sheet in checking and return strokes, an end plate mounted beyond the last thread of said thread sheet to engage said head and having a recess to receive said head ,for closing said switch at the end of said checking stroke, a cam-actuated switch synchronized with the carriage feed connected to break said stop circuit and set up atest circuit before the head enters said recess, a second cam-actuated switch actuated during the return stroke of said carriage and connected to complete said stop circuit, means responsive to said test circuit to render said stop circuit inoperative, and a third cam-actuated switch actuated during said return stroke to clear said test circuit before the next checking stroke.

4. An automatic control for a warper or the like having a moving thread sheet and driving means therefor, comprising a switch having an actuating head adapted to span two threads of said thread sheet but to pass through the space left by a missing or loose thread, a switch carriage carrying said switch, means mounting said carriage to traverse said thread sheet with the switch normally held open by contact of said head with the threads of said sheet, means causing said head to enter the space left by a missing or loose 10 thread to close said switch, a stop circuit including an electron discharge tube connected to be controlled by said switch, a stop relay connected to be, energized by said tube and adapted to stop said thread sheet driving means, means continuously feeding said carriage across said thread sheet in checking and return strokes, means closing said switch at the end of each checking stroke, a cam-actuated switch synchronized with the feed of said carriage and connected to disconnect said tube from said stop relay and connect said tube we check relay before the closing of said switch by said last means, a test circuit connected to actuate said stop relay, a second cam-actuated switch connected to set up said test circuit during said return stroke, and means actuated by said check relay to break said test circuit.

5. An automatic control for a warper or the like having a moving thread sheet and driving means therefor, comprising a switch having an actuating head adapted to span two threads of said thread sheet but to pass through the space left by a missing or loose thread, a switch carriage carrying said switch, means mounting said carriage to traverse said thread sheet with the switch normally held open by contact of said head with the threads of said sheet, means causing said head to enter the space left by a missing or loose thread to close said switch, a stop circuitincluding an electron discharge tube connected to be controlled by said switch, a stop relay connected to'be energized by said tube and adapted to stop said thread sheet driving means, means continuously feeding said carriage across said thread sheet in checking and return strokes, means closing said switch at the end of each checking stroke, a cam-actuated switch synchronized with the feed of said carriage and connected to disconnect said tube from said stop relay and connect said tube to a check relay before the closing of said switch by said last means, a test circuit connected to actuate said stcp'relay, a second cam-actuated switch connected to set up said test circuit during said return stroke, means actuated by said check relay to break said test circuit, and a third cam actu ated switch connected to deenergize said check relay before the next checking stroke.

6. An automatic control for a warper or the like having a movin thread sheet and driving means therefor, comprising a switch having an actuating head adapted to span two threads of said thread sheet but to pass through'the space left by a missing or loose thread, a switch carriage carrying said switch, means mounting said carriage to traverse said thread sheet with the switch normally held open by contact of said head with the threads of said sheet, means causing said head to enter the space left by a missing or loose thread to close said switch, a stop circuit connected to be actuated by the closing of said switch and adapted to stop the thread sheet drivin means, an endless cable connected to drive said carriage, a drum carrying said cable, a reversible motor connected to drive said drum forcausing said carriage to traverse said thread sheet, a reversing switch for said motor, and means actuated at the ends of each traverse of said carriage to actuate said reversing switch.

7. An automatic control for a warper or the like having a moving thread sheet and driving means therefor, comprising a switch having an actuating head adapted to span two threads of said thread sheet but to pass through the space left by a missing or loose thread, a switch carriage carrying said switch, means mounting said 11 carriage to traverse said thread sheet with the switch normally held open by contact of said head with the threads of said sheet, means causing said head to enter the space left by a missing or loose thread to close said switch, a stop circuit connected to be actuated by the closing of said switch and adapted to stop the thread sheet driving means, an endless cable connected to drive said carriage, a drum carrying said cable, a reversible motor connected to drive said drum for causing said carriage to traverse said thread sheet, a reversing switch for said motor, and camactuated means driven in synchronism with the feed of said carriage to actuate said reversing switch at the ends of each traverse of said carriage.

8. An automatic control for a warper or the like having a moving thread sheet and driving means therefor, comprising a switch having an actuating head adapted to span two threads of said thread sheet but to pass through thespace left by a missing or loose thread, a switch carriage carrying said switch, means mounting said carriage to traverse said thread sheet with the switch normally held open by contact of said head with the threads of said sheet, means causing said head to enter the space left by a missing or loose thread to close said switch, a stop circuit including an electron discharge tube connected to be controlled by said switch, a stop relay connected to be energized by said tube and adapted to stop the thread sheet driving means, means continuously feeding said carriage across said thread sheet in checking and return strokes, means closing said switch at the end of each checking stroke. a cam-actuated switch synchronized with the feed of said carriage and connected to disconnect said tube from said stop relay and connect said tube to a check relay before the closing of said switch by said last means, a test circuit connected to actuate said stop relay, a second camactuated switch connected to set up said test circuit during said return stroke, means actuated by said check relay to break said test circuit, a third cam-actuated switch connected to deenergize said check relay before-the next checking stroke, and switch means responsive to the stopping of said warper to stop said feed means and deenergize said tube.

9. An automatic control for a warper or the like having a moving thread sheet and driving means therefor, comprising a member having an actuating head adapted to span two threads of said thread sheet but to pass through the space left by a missing or loose thread, a carriage carrying said member, means mounting said carriage to traverse said thread sheet with the member no'rmally held retracted by contact of said head with the threads of said sheet, means causing said head to advance into the space left by a missin or loose thread, stop means connected to be actuated by the advance of said member and adapted to stop the thread sheet driving means, means continuously feeding said carriage across said thread sheet in checking and return strokes, an end plate mounted beyond the last thread of said thread sheet to engage said head and having a recess to receive said head for checking the mechanism at the end of said checkin stroke, and means adjusting the position of said end plate to conform to the width of the thread sheet.

10. An automate control for a warper or the like having a moving thread sheet and driving means therefor, comprising a contact member having an actuating head adapted to span two threads of said thread sheet but to pass through the space left by a missing or loose thread, a carriage carrying said member means mounting said carriage to traverse'said thread sheet with the member normally held retracted by contact of said head with the threads of said sheet, means causing said head to advance into the space left by a missing or loose thread, stop means actuated by the advance of said member and adapted to stop the thread sheet driving means, means continuously feeding said carriage across said thread sheet inchecking and return strokes, and means actuated during the return strokes to test the operative condition of said stop means.

JOHN S. SENEY.

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

UNITED STATES PATENTS 2,390,799\ Linsenmeyer et al. Dec. 11, 1945 Certificate of Correction I Patent No. 2,450,996. October 12, 1948,

JOHN S. SEN EY It is hereby certified that errors appear in the printed specification of the above numbered patent requiring correction as follows:

Column 8, line 30, for wraper reed warpcr; column 12, line 21, for automate read automatic;

and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 11th day of January, A. D. 1949.

THOMAS F. MURPHY, V I Assistant Commissioner of Patents.

Certificate of Correction I Patent No. 2,450,996. 7 October 12, 1948,

JOHN S. SENEY It is hereby certified that errors appear in the printed specification of the above l numbered patent requiring correction as follows:

Column 8, line 30, for wraper read warper; column 12, line 21, for "automatc read automatic;

and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 11th day of January, A. D. 1949.

THOMAS F. MURPHY, 7 Assistant Gommz'ssioner of fatal.

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