US3435854A - Control apparatus for a loom - Google Patents

Description

April 1, 1969 Filed June I5, 1966 v. svATY ET AL CONTROL APPARATUS FOR A LOOM l Sheet of 4 Ul *U1 @Us REVERSE' HAGA/ET mi sa s,

Aprill, 1969 v. svATYr ET Al. 3,435,854

CONTROL APPARATUS FOR A LOOM Filed June 5,1966 sheet 3 @f4 sc P l r ol .-1 1F-J1 sie MOTOR April 1, 1969 Filed June 5, 1966 svATY' ET AL- CONTROL APPARATUS FOR A LOOM United States Patent U.S. Cl. 139-1 10 Claims ABSTRACT F THE DISCLOSURE The control circuit of a loom is operated by a pushbutton start switch, a pushbutton stop switch, and a pushbutton reverse switch by which electrically operated parts of the loom are connected with a higher voltage at the beginning of certain operations, and with a lower voltage during normal operation of the loom.

Various methods of starting and stopping looms are known. The oldest ones use levers and mechanical transmissions or possibly pushbuttons, by means of which the electric motor of the loom is started and stopped. Only Ithe more recent methods use a pushbutton control in connection with an effective clutch and a brake mounted in the machine. None of the devices hitherto known fulfills all the following requirements of the weaving technology while maintaining simultaneously the required `simplicity of the construction.

The involved technological requirements are the following:

Starting the machine during one revolution.

Very fast stoppage of the machine in the case of malfunction of the weft inserter.

Machine stoppage in the threading position upon the signal of the warp stop motion.

Machine stoppage upon weft yarn breakage in the same shed and following return of the batten to the rear dead centre, in which replacement of the missing weft thread is possible.

Machine starting from one position (rear dead centre) of the Ibatten, in order to maintain the `llection of the reed, caused by the dynamic forces acting upon starting of the reed always on the same value.

Possibility of turning the machine manually as well as by a motor which is necessary for the adjustment of lthe position of the loom. Possibility of turning the machine manually as well as by a motor even if the warp stop motion is open (in the case warp being slack with out breakage). Possibility of turning the machine fo:- ward one revolution even in the case of open weft stop motion (for the eventuality of dividing the web).

All the said required functions are accomplished bv the present invention which relates `to looms, the clutch and the brake of which are electromagnetically controlled. The present invention provides an electric circuit with pushbutton switches START, STOP and RE- VERSE, by means of which, upon pushing one or two of them, loom starting `and stopping, turning for one revolution, returning the batten to the rear dead centre and manual as well as turning of the loom by a motor can be achieved. Turning the loom for one revolution forwards is achieved by pushing button START, followed immediately by pushing button STOP and holding the latter down until the loom is stopped. By pushing button START, the weft and warp stop motion circuits `are disconnected and brought out of action, this enabling to turn the machine even when said stop motions are open, however, preventing the machine from being started with the weft inserter ice in an incorrect position, said weft inserter being controlled by its own stop motions. Moreover, this electrical arrangement can assure after an impulse from the known weft checking device, stopping of the loom, even :before the beat-up, the batten being returned to the rear dead centre by means of pushbutton REVERSE Where the weft can be replaced. At the time at which the electric motor is not running up, the warp and weft stop motion circuits are out of action, this enabling to turn the machine manually for adusting even an empty loom. The electric circuit of the device according to the present invention is connected with two voltages, the higher of which being in action only during the time of starting the machine, i.e. during pushing down the pushbutton START or during the action of the REVERSE switch for the reversed motion of the loom. The lower voltage is fed to the circuit only during the normal run of the machine, i.e. after releasing the -pushbutton START.

Further advantages and features of the present invention are shown in the specification and in the accompanying drawings, in which:

FIG. 1 shows a circuit diagram showing the control circuit of the invention;

FIG. 2, the circuit diagram after starting the ilow with the started motor;

FIG. 3, the circuit diagram in the unbraked state of the loom with the clutch engaged during manual movement of the loom;

FIG. 4, the circuit diagram during returning the batten to the rear dead centre;

FIG. 5, a diagram showing the circuit of the motor driving the loom; and

FIG. 6, the circuit diagram of FIG 1 combined with a fragmentary perspective View of the loom, and illustrating the electrical connections between the control circuit and the loom.

The shown diagrams are provided on the left side with a column of numbers, marking the diagram lines one to seven. On the right side of the diagrams, certain lines are provided with numbers having a bar either above or below them. The latter numbers show, that in this line either a relay or another switch control means is operat'ive for closing or opening in the line of the diagram marked by this number contacts marked with the same reference character as the corresponding relay or control means, plus a subscript. Closing is marked by the bar above the number, opening by the bar below the number.

FIG. 5 shows the drive motor 6 of the loom connected with a primary AC voltage source U4 by contacts Sie for forward rotation, by reversing contacts 82e, and main switch P.

Voltage source U4 is connected to the primary winding of a transformer T whose secondary winding is tapped and connected with rectifying diodes D to produce DC voltages U1 and U2, and an AC voltage U3.

FIGS. 1 and 6 also show thecommon terminal 'Ub -U2, -U3, terminals -i-Ul, |-U2, and the second AC terminal -U3. The DC voltage U2 is greater than the DC voltage U1.

Referring now to the circuit diagrams of FIGS. 1 to 4 and 6, in the first line, from left to right, are a condenser C1, contacts Rm of a relay R1 in line one, contacts ZU of a weft stop motion 1, contacts ZO of a warp stop motion 2, contacts ZSL and ZSP of the left and right stop motions 3 and 4 respectively for checking the weft inserter 5, for example a gripper shuttle, an auxiliary normally closed contact S22, of a contactor S2 in line seven, contacts TS of a STOP pushbutton for stopping the loom, but not the motor of the loom, contacts TR,1 of a RE- VERSE pushbutton, serving for returning the sley 7 to its rear dead center position, and the relay R1. In the second line of the circuit diagram of FIGS. 1 and 6, there are: contacts TA of a START pushbutton serving for releasing the brake of the loom and for actuating a clutch 8 connecting drive motor -6 with the loom, contacts Kzo of a position switch 9 control'led by a cam 16, and release contacts TMa of a MOTOR pushbutton. In the third line there are: two switch contacts S21, and S2c of the contactor S2 in line seven, contacts K of a position switch controlled by a cam 15, an auxiliary normally closed contact S1,L of a contactor S1 in line 6 and an electromagnet M which controls the clutch 8 of the loom. The movable clutch part serves simultaneously as a brake when disengaged from the drive motor 6. In the fourth line there are: condensers C2 and C3 serving for a quick absorption of the electromagnetic energy being released by the electromagnet M upon interruption of circuits so that scorching of the contacts is avoided. Between the fourth and fifth line there is the second terminal -U3 of the source of an alternating voltage. In the fth line of FIG. 6 there are: switch contacts TMb of the MOTOR pushbutton in line two, a relay R2 and contacts RT of a thermal relay 11, serving for the protection of a motor 6 from excessive currents, multiple main contacts S1c of contactor S1 in line six for the forward rotation of motor 6, see also FIG. 5. In the sixth line of FIG. 6 there are: contacts R22 of the relay R2 in line five, contacts TR,o of the REVERSE pushbutton in line one. Contacts S2d are auxiliary normally closed contacts of the contactor S2 in line seven. Contacts 82e, see FIG. 6, are multiple main switch contacts of the contactor S2 in line seven, see also FIG. 5. In the seventh line of FIG. 6 there are: switch contacts TRc of the REVERSE pushbutton, auxiliary normally closed contacts S11, of the contactor S1 in line six, contactor S2 for causing reverse rotation of motor 6 for returning the sley 7 into its back position, and in FIG. 6 switch contacts P of a main switch 12 which close the main circuit of the motor 6.

The auxiliary contacts S211, S11, prevent the contactors S1 and S2 from being simultaneously energized.

The voltage -U1, -l-U1 which is lower than voltage -U2, .Lf-U2 serves as a holding voltage and is just suicient to hold by electromagnet M the clutch 8 in a closed position. The motor 6 is mounted on the loom and is interconnected with the main shaft of the loom by means of a belt drive and an electromagnetic clutch 8, the latter engaging a brake member for braking the loom when disengaged from the motor.

As shown in FIG. 5, motor 6 is connected to the main source of Voltage -U4 and for the forward run is switched by the main contacts S1c of the contactor S1 in line six of the wiring diagram in FIG. 6.

The reverse running of the motor 6 is brought about by changing the phases of the main leads of motor 6 by the main contacts S2e of the contactor S2 in line seven of the wiring diagram in FIG. 7.

A complete disconnection of the motor 6 from the main voltage U4 is effected by operation of the main switch handle 12, the contacts P of which are shown in FIGS. 5 and 6.

FIG. 6 shows a diagrammatic representation of the clutch 8 which is controlled by the electromagnet M. The clutch 8 serves simultaneously as a brake at the time when the electromagnet M is deenergized. It only brakes the moving mechanisms of the loom, not motor 6. When the electromagnet M is energized the clutch 8 releases the machine brake and so connects motor 6 with the loom.

For turning the machine manually, there is a hand wheel 14 disposed on the main shaft 13. This hand Iwheel can be rotated only when the START pushbutton is depressed and at the time when the motor 6 is at rest. By depressing the START pushbutton the circuit of the electromagnet M of the clutch 8 is interconnected and the brake 'is released, so that the loom may be turned manually.

The position switches 10, 9 are operated by cams on main shaft 13, as shown in FIG. 6. The function of these position switches is the following one: For example, if the normally operating loom has to be stopped, the contacts TS are opened by depressing the STOP pushbutton. These contacts, however, are bridged by the contacts K of position switch 10 and are opened only when the sley 7 reaches its rear dead center position, the effect being obtained by angularly setting a cam =15 on the main shaft 13, cam 10 controlling the contacts K of the position switch 10. The circuit interruption results in an immediate stopping of the loom inthe dead center position.

Similarly, when the machine is to be turned forward one revolution by using motor 6, the position switch 10 is utilized as follows: on depressing the START pushbutton the machine begins to start from the rear dead center position of the sley 7 and immediately thereafter the STOP pushbutton is to be depressed, however, the circuit is not interrupted since the contacts TS of the STOP pushbutton are bridged by the contacts K of the position switch 10, the said contacts being opened only at the moment when the sley 7 reaches again its rear dead center position. In this case the position switch 10 is again opened by the respective cam 15 turning with the main shaft 13. In this case, too, it is necessary to hold down the STOP pushbutton until the machine comes to a complete stop.

For reversing the machine one revolution in order to remove a broken weft thread or in the case that the shuttle does not enter the shuttle box properly, the function of the position switch 10 (collector) is analogous as in the case of turning the main loom shaft one revolution, forwardly.

When the warp stop motion 2 is actuated and interrupts the circuit, the position switch 9 becomes effective, which bridges the contacts ZO of the warp stop motion 2.

The position switch 9 is controlled by a cam 16 disposed on the rnain loom shaft 13 and its contacts Kzo are opened just at a moment at which the heddles or heald shafts, not shown, are aligned in a position in which the warps are located in a common plane, for example when a broken warp end is to be removed.

From the function of the position switch 9, it follows that when the warp stop motion 2 interrupts the circuit at any moment, the loom is not stopped at once, but it continues to run until the cam 16 causes opening of position switch 9, the contacts Kzo of which bridge the contacts ZO of the warp stop motion 2, whereafter the cam controlled position switch 9 interrupts the circuit of the electromagnet M, resulting in an immediate stopping of the machine. Upon an increased electrical input in the motor circuit of FIG. 5 into which the thermal relay 11 is connected, the contacts RT of the thermal relay 11, see FIG. 6, are opened whereby the danger of damage to circuit parts is eliminated.

As shown in FIG. 5 main contacts S1., (FIGS. S and 6) interconnect the main circuit of the motor 6 for forward running. These contacts S1c are controlled by the contactor S1. The contactor S2 controls the main contacts S2c for a reverse running of the motor.

In FIG. 6 both the left hand stop motion 3 and the right hand stop motion 4 controlled by the weft inserter 5, for example a gripper shuttle, are diagrammatically represented, connected with the corresponding contacts ZS1I and ZSP respectively.

The normally closed contacts S1a of the contactor S1 bridges both the contacts ZU of the weft stop motion -1 and the contacts ZO of the warp stop motion 2, in order to keep the circuit of the voltage -U1, |U1 closed even when the contacts ZU and ZO of the stop motions 3, 4 are opened. The contacts ZSL of the left hand stop motion 3 and the contacts ZSP of the right hand stop motion 4 of the weft inserter 5 are not bridged by this contact S12 in order to enable checking the correct setting of the loom by turning the machine manually by the hand wheel 14.

To attain this, first of al1 the motor 6 must be cut olf, but the electromagnet M of the clutch 8 must be energized. To close the electromagnet M of the clutch 8, the START pushbutton is used which closes the circuit of voltage -U2, '-i-Uz across the electromagnet M and in the second branch across the relay R1 whose contact Rh,L closes the circuit of the voltage -U1, +U1. Thereby the electromagnet M is permanently connected to the Voltage -U1, '-t-UZ, and brake-clutch 8 is released so that the loom can be manually turned for setting it and checking.

While the motor 6 is running, the resting contact S1, of the contactor S1 is cut olf, so that the circuit of the voltage U1, '+U1 is now being closed by both the contacts ZU of the weft stop motion 1 and the contacts ZO of the warp stop motion 2, which were bridged up to now by the resting contact 81,1.

IIn order to fulfill all requirements enumerated in the introduction, the following operations are to be carried out:

Starting the motor (FIG. 2).

Unbreaking the loom and engaging the clutch.

While the motor 6 is out of action, loom is manually turned for adjustment (FIG. 3).

Forward running of the motor when (a) the loom is running continuously, (b) the looms is to be turned for one revolution forwards.

After reversing the turning direction of the motor for returning the batten into its rear dead centre (FIG. 4):

(a) correction a weft breakage,

(b) stopping the loom because of the weft inserter malfunction in which case the batten is to be returned to its rear dead centre, the inserter put into its correct position and the loom started from the rear dead centre of the batten.

Starting the motor (FIG. 2): The pushbutton MOTOR of contacts TMa, TMb serves for starting the motor, the disconnecting contacts TMa of said pushbutton being situated in the second and the connecting contacts TM]D in the fifth line. The disconnecting contacts of the pushbutton MOTOR in the second line disconnect at rst for safety reason the circuit of the magnet M, which can be connected even during stoppage of the motor by pressing down pushbutton START either by mistake or during adjustment of the machine. The connecting contacts of the pushbutton MOTOR in the fifth line close the AC circuit U3 (dashed lines). The circuit has two branches. The first one goes on the sixth line over the contacts TR1J of pushbutton REVERSE, the auxiliary rest contacts 82.1, S2 and the contactor coil S1, the second branch on the fifth line runs over relay R2 and after connecting` the two branches by means of the thermal relay switch RT on the fth line, the circuit is closed to the second AC terminal U3. The main contacts S1c of contacto-r S1 connect the motor with the main voltage U4 and the contacts of relay R2 in line six connect permanently the AC circuit, this enabling the release of the pushbutton MOTOR. The circuit closed in this way is shown in FIG. 2 (thick lines), and the connected contactor S2 disconnects the -auxiliary contacts 81 in line three, -said contacts being unable to arch over the contacts of the warp and weft stop motions ZO and Z in line one. The motor stoppage is effected by the main current switch 121P or by a pushbutton 11 of the thermal relay RT in the fifth line.

The lunbraking and the engagement of the clutch for turning the loom during manual -setting and adjustment with the stopped motor is shown in BIG. 3. By pressing down the pushbutton START, the DC voltage circuit +U2 is closed by contacts 'IA, as shown in FIG. 3 is dashed lines, then in line one over the contacts ZSL of the left and right weft inserter checking stop motion, the

auxiliary rest contacts 82 of contactor S2, over the contacts TS of the pushbutton STOP, over the contacts M1, of the pushbutton MOTOR in the second line, where said circuit is divided into two branches. The branch in the third line is closed by ythe electromagnet M, which controls the unbraking action of the loom and the clutch engagement, the branch in the first line running over the contacts TRa of the pushbutton REVERSE and the winding of relay R1. Afterwards, the two branches are connected, closing the circuit at the common terminal -U1, -U2, U3.

'Ilhe contact Rm of relay R1 in line one connects the circuit to the working voltage |U1. The rest contact S15 of contactor S1 in the third line interconnects either all or only certain stop motion circuits in such a way that the circuit is closed even when the stop motions are disconnected. In the example shown only weft motion contacts Z and warp stop motion contacts ZO are bridged. The stop motions contacts ZSL and 251, controlling the weft inserter are not bridged by this contact 81a, as during manual turning of the loom, their correct adjustment can be carried ont and checked. Moreover, the circuit is closed over ZSP and ZSL, Sac, etc., as s'hown in the circuit diagram.

In this Way, the circuit is permanently connected to voltage +U1 and pushbutton START can be released. This condition is shown in FIG. 3 in heavy lines. Since during unbraking the loom and engaging the clutch, the armature of the electromagnet M must close an air gap, voltage -l-Uz is higher than voltage -l-U1, the latter maintaining said armature after closing said air gap only in the connected position. Between the terminals -I-UZ and -t-U1 no short circuit can take place, :as the source of these voltages is transformer T rectifying voltages U1 and U2 in a conventional manner by means of diodes D, as shown in lFIG. 5. Further, FIG. 3 shows that all stop contacts,`i.e. the warp stop motion contacts ZO, the weft lstop motion contacts Z and the gripper shuttle or weft inserter stop motion contacts ZS, must be in the connected state, otherwise the loom can be turned, or shifted manually only when pressing down pushbutton START, in the case of a disconnected warp stop motion or weft stop motion.

Braking of the loom and engagement of the clutch during the normal run of the loom (FIG. 1 and FIG. 6) is carried out, as follows:

After starting the motor by pushing down pushbutton MOTOR, the loom is started by pressing down pushbutton START, in which case the connection of the circuit takes place as already specied above with the only difference, that the contacts S1a in line three are disconnected and the circuit of voltage -l-U1 must be closed over the contacts Z0 and Z of the weft and warp stop motions.

Stoppage of the loom is then possible in the following manner:

(l) By pressing down pushbutton STOP.

In this case, the circuit is not immediately interrupted as it is still closed over the contacts of the end contactor K in line three opening the circuit only when fthe batteri is in its rear dead centre, whereby the revolution is finished. The interruption of the circuit brings about the immediate loom stoppage.

(2) In the case that the circuit is interrupted by any of the control devices.

The weft stop motion Z disconnects the circuit and stops the loom in aposition, in which the batten is 4before the beat-up. The gripper checking device ZSL and ZSP stops the machine in the case of failure also in a position in which the batten B is before the beat-up. The warp stop motion contacts ZO disconnects the circuit at an arbitrary moment, however, said stop motion contacts are bridged by the contactors KZO of position switch 9 which stop the loom in the level position of 'the heald shafts 7 (i.e. in the position in which a broken warp yarn is removed).

From the diagram in FIG. 1 can be seen that the loom can be started even when the warp stop motion 2 or weft stop motion 3 is disconnected. This is necessary if the warp stop motions 2 are in action not because of breakage, but because of slackened warp yarns. In that case the loom is in action only when the pushbutton START is pressed down.

Turning the loom for one revolution is carried out, as follows:

By pressing down the pushbutton START the loom is started from the rear dead center position of the batten B. By pressing down the pushbutton STOP, the circuit is closed again over the contacts K and the loom finishes the revolution at the rear dead centre of the batten, at which moment the circuit is disconnected the contacts K of the cam controlled switch 10.

Returning the batten B from the position before the beat-up to the rear dead center position (FIG. 4) is carried out as follows:

IBy pressing down the pushbutton REVERSE, the relay R1 is disconnected by contacts TRa from the circuit in the first line, and in the sixth line the circuit branch of contactor S1 is disconnected by contacts TRb, whereby the motor 6 is disconnected by contacts S1c from the voltage U4, see FIG. 5. At the same time, the disconnected contactor S1 connects the auxiliary rest contacts Slb in line seven of the circuit branch with contactor S2. The connection of this circuit branch is nished by the contacts TRc of the pushbutton IREVERSE in line Seven.

The contactor S2 connects the motor with the voltage U4 by contacts S2e in such a way, that said motor rotates in the opposite sense as long as the pushbutton REVERSE is -pressed down. Simultaneously, the auxiliary contacts S21, of contactor S2 in line three connect the terminal -l-U2 over contacts K of cam controlled switch 10 and the circuit is further closed over the contacts of the pushbutton MOTOR and the electromagnet M to the terminal -U2. The elcctromagnet M causes braking of the loom and engages the clutch 8. The loom starts running in the reversed sense. The contact K of switch 10 interrupts the circuit and stops the loom, as soon as the batten reaches the rear dead center position. The motor `6, however, runs still in the reversed sense as long as the pushbutton REVERSE is pressed down. As soon as the pushbutton REVERSE is released, its contacts TR in line seven interrupt the circuit of contactor S2, the motor is disconnected from voltage U4 and in line six the contacts TR1, of pushbutton REVERSE are re-established. By means of the auxiliary rest contacts 52d, the circuit of contactor S1 is closed for connecting the motor with voltage U4 by contacts Slc for rotation in the original sense of rotation. The motor is running, but, the loom does not run and after removing the cause of a malfunction (misrun of the gripper or yarn breakage) said loorn can be started Iby the pushbutton START in line two.

There is still to be explained, why the relay R1 must be disconnected from the lcircuit by means of the TRa of pushbutton REVERSE in line one, even when the contactor S2 in line seven is energized and its auxiliary rest contacts 82a in line one the circuit over the switch 10, K after the batten has reached its rear dead center position, and the contacts Rm in line one would be opened by interruption of the circuit. In the case, that the attendant would not hold down the pushbutton RE- VERSE until the batten B stops in its dead center position so that the relay R1 in line one would hold the contacts RM, in line one closed, the current from terminal -i-U1 would immediately start the loom to run forwards. The loom would, however, be again stopped by the stop motion that was in operative before, and the return action would have to be repeated.

From the description of the operations of the invention it is obvious, that for meeting all requirements laid upon by the weaving technology, only three pushbuttons are suicient, i.e. pushbuttons START, STOP and REVERSE. By pressing down the pushbutton START the loom is started, by pressing down the pushbutton STOP the loom is stopped, but not the motor. By successively pressing down the pushbuttons START and STOP the loom shaft can be turned for one revolution corresponding to one pick. If the loom is stopped by a control device (warp or weft stop motion, or gripper shuttle stop motion device) i.e. in a position in which the batten B approaches the beat-up position, the batten can be returned to the rear position by pressing down the push-button RE- VERSE.

The fourth pushbutton MOTOR is used normally only at the beginning of a shift and can be therefore mounted outside the control panel, e.g. on the housing H of the electric wiring of the circuit shown in FIG. 1, on which also the pushbutton of the thermal relay RT and the main switch 12, P are situated. Stoppage of the motor can Vbe obtained by pressing down the pushbutton RT or by switching olf the main switch 12, P. On the control panel of the loorn, there are for the sake of simplicity only three pushbuttons.

What is claimed is:

1. Control apparatus for a loom, comprising in combination, control circuit means including manual start contacts, manual stop contacts, and manual reversing contacts for starting, stopping and reversing the loom, respectively; a irst source of a higher voltage and a second source of a lower voltage, said [first voltage source being connected with said control circuit means when said start contacts and reversing contacts are manually closed, respectively; said control circuit means including contact means for disconnecting said trst voltage source and for connecting said second voltage source with said control circuit upon manual release of said start contacts so that said control circuit is energized by a lower voltage during normal forward operations of the loom than during starting and reversed motion of the loom.

2. Control apparatus for a loom as claimed in claim 1 comprising a start pushbutton for operating said start contacts, a stop pushbutton for operating said stop contacts, and a reverse pushbutton for operating said reversing contacts.

3. Control apparatus as claimed in claim 1 wherein said loom comprises a weft stop motion including contacts for disconnecting said second voltage source from said weft stop motion for causing stopping of the loom upon a weft thread breakage at the beginning or during the pick of the lweft thread and before the weaving of the weft thread into the warps.

4. Control apparatus as claimed in claim 1 wherein said loom has a weft inserting device, a first stop motion for the same, and other stop motions; wherein said control circuit includes means for connecting said first stop motion to both said first and second voltages during forward running of the loom and for connecting the other stop motions only to the second voltage source whereby said first stop motion is operative Awhen said start contacts are held closed; and means for disconnecting all stop motions from said voltage sources upon operation of said reversing contacts.

5. Control apparatus as claimed in claim 4 wherein said control circuit includes a position switch actuated in one position of said loom, wherein said other stop motions include a warp stop motion having contacts bridged by said position switch in a position of said loom in which a warp thread can be threaded into the loom so that the actuated warp stop motion stops the loom in said threading position.

6. Control apparatus as claimed in claim 4 wherein said dirst stop motion of said weft inserter device has contact means for disconnecting the circuits of said rst and second voltage sources when said weft inserting device is in an incorrect position and causes stopping of the loom before the beat-up of the weft thread so that thel loom can not be started before the position of said weft inserting device is corrected.

7. Control apparatus as claimed in claim 4 wherein said other stop motions include a warp stop motion and a weft stop motion respectively having warp stop motion contacts and weft stop motion contacts which are connected with said irst voltage source by a first circuit part, said rst voltage source having another circuit part connected with said start contacts, and comprising a position switch opened by said loorn in the rear dead center position of the same and bridging said s-top contacts when closed so that when said start contacts and stop contacts are successively closed, the loom turns one revolution from one rear dead center position to the following rear dead center position.

8. Control appara-tus as claimed in claim 7 comprising a motor for driving the loom; wherein said control circuit comprises relay means controlled by said reverse contacts and first relay contacts operated by said relay 4means and located in the circuit of said motor for re- 20 versing the direction of rota-tion of the same upon operation of said reverse contacts; and including other relay contacts cooperating with said position switch so that said rst voltage source is disconnected in said rear dead center position of said loom whereby the reverse rotation of said loom is stopped at the rear dead center position of the same.

9. Control circuit as claimed in claim 8 wherein said circuit means include contact means for bridging the contacts of said warp stop motion and said weft stop motion so that the same are rendered inoperative when said motor is stopped; and comprising means for manually turning said loom in both directions of rotation for setting and adjustment of the loom after actuation of said start contacts.

10. Control apparatus as claimed in claim 1 including a motor and a clutch connecting said motor with said loom; wherein said control circuit includes an electromagnet for operating said clutch, and motor switch means for starting said motor and including contacts for disconnecting said electromagnet so that said clutch cannot be engaged during starting acceleration of said motor.

References Cited UNITED STATES PATENTS 2,148,700 2/1939 Lohsse 139--336 2,600,667 6/1952 Mason 139-1.4 2,805,686 9/1957 Godschalx 139-14 2,810,402 10/ 1957 Godschalx 139-1.4

HENRY S. JAUDON, Primary Examiner.

U.S. Cl. X.R.

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