US2148700A - Mechanism for stopping electrically driven looms - Google Patents

Description

Feb. 28, 1939. w L SE 2,148,700

MECHANISM FOR STOPPING ELECTRICALLY DRIVEN LOOMS Filed'Aug. 6, 1938 4 Sheets-Sheet 1 M'UJ. L flfff r MA In vemor:

Feb. 28, 1939. ,w LOHSSE 2,148,700

MECHANISM FOR STOPPING ELECTRIGALLY DRIVEN LOOMS Filed Aug. 6, 1938 4 Sheets-Sheet 2 423 YZ r Fig. 1/

/n venfor': f r v Mill/1n [ah 51E 765 765 r m Feb. 28, 1939. w LQHSSE 2,148,700

MECHANISM FOR STOPPING ELECTRICALLY DRIVEN LOOMS Filed Aug. 6, 1938 4 Sheets-Sheet 3 F/lg. 4

In vemon' f wg W. LOHSSE Feb. 28, 1939.

MECHANISM FOR STOPPING ELECTRICALLY DRIVEN LOOMS Filed'Aug. 6, 1958 4 Sheets-Sheet 4 Patented Feb. 28, 1939 PATENT OFFICE MECHANISM FOR STOPPING ELECTRIOAILY DRIVEN LOOMS Wilhelm Lobsse, Gladbach-Rheydt Germany,

assignor to. Schol'ch Werke A.

Rhineland, Germany Rheydt- Application August 6, 1938, Serial No. 223,513 In Germany January 31, 1936 13 Claims.

My-invention relates to improvement in looms, and more particularly to a mechanism for stopping electrically driven looms in a predetermined position in case of a disturbance.

As is well known, there are various kinds of disturbances or interruptions of service which may occur during the operation of a loom. For example, the weft thread or one of the warp threads may break, the shuttle bobbin may become empty or the flying shuttle may fail to reach the shuttle box and becomes trapped in the shed, whereby a so-called shed breakage resulting also in a breakage of the warp threads may be caused.

One of the objects of my invention is to provide a mechanism, which after the occurrence of any disturbance or interruption of service, automatically arrests an electrically driven loom in a predetermined position in which the 100mslay always occupies its rear position.

Another object of my invention consists in the Provision of means, which afterthe occurrence of a disturbance, preventthe loom slay from reaching its front position in which it is nearest to the breast beam. Therefore, in case of a disturbance, it is necessary to brake the loom to such an extent, that the loom is already arrested before the loom slay reaches its front point of reversal. Automatic devices then must return the loom slay to its furthest rear position, whereupon the loom is positively stopped.

Still another object of the invention is to provide means, which during the stopping of the loom, electrically brake the driving motor by means of reverse current and at the same time render operative a resilient bufier brake by tensioning the springs thereof, whereupon the loom slay is returned into its furthest rear position by the force inherent in said springs brought under tension.

A further object of my invention is to provide an additional friction brake which aids the active arresting of the loom and which also serves to consume the excess energy of the buffer springs being under tension, if the loom slay is returned.

Another object of my invention is to provide an electrical remote control for the above mentioned diiferent types of brakes and furthermore to time the braking operation by reverse current in such'a way by means of said electrical remote control and by means of the well known control of the weft thread guard, that the reverse current braking is operative only during the active arresting of the loom.

Still another object of my invention is to provide a hand release, by means of which the arresting of the loom may be carried out in exactly the same manner as takes place by means of the electrical remote control after the occurrence of a disturbance.

Furthermore, it is an object of my invention to provide an electrical remote control, by means of which the arbitrary starting and stopping of the motor by hand, either to begin or to end a normal operation of the loom or to cause short movements of the loom slay, may be obtained, and to combine this remote control with the above mentioned remote control for the arresting operation.

Still another object of my invention is to provide means, which through the electrical remote control prevent the weft thread guard from act ing until the first pick or shot has occurred.

The above objects, as well as others not particularly pointed out, will appear from the following description withreference to the accompanying drawings in which like reference characters in the several figures denote like parts and in which Fig. 1 is a diagrammatical illustration of my new driving and arresting mechanism of an electrically driven loom,

Fig. 2 shows an additional device adapted to release the arresting means in order to avoid a shed breakage,

Fig. 3is a front view of a part of the loom slay with the weft thread guard and the device controlling the latter mounted thereon,

Fig. 4 is a sectional view taken on line 4-4 of Fig. 3,

Fig. 5 is a top plan view of the loom slay, the breast beam and the weft thread guard control,

Fi 6 is a sectional view taken on line 66 of Fig. 5,

Fig. 7 is an elevational view of the combined bufier and friction brake,

Fig. 8 is a sectional View taken on line 8-8 of Fig. 7,

Fig. 9 is a fragmental sectional view taken on line 9-9 of Fig. 8, and

Fig. 10 is a sectional view taken on line Ill-Ill of Fig. 7.

Fig. 11 shows diagrammatically a warp thread guard controlling an electric contact.

Referring to Figs. 1, 3, 4 and 5, I indicates the loom slay. A plate 2 is attached to the inner side of said loom slay and is provided with lugs 3, 4 and 5, in which a bar 6 is slidably arranged. ll indicates the breast beam provided with lugs l2 and 13, in which a bar Ill consisting of two parts is slidably arranged. A member 9 is adjustably arranged on the bar I and may be fixed in a predetermined position by means of a screw H. An adjusting collar l4 mounted on the bar l8 prevents a left-hand movement ofthe latter, and a spring l5, one end of which being secured to the lug |3 the other end thereof being secured to a pin l6 attached to the bar I8, tends to prevent a right-hand movement of the bar l8. A rod 8 provided with a threaded portion I9 and a sleeve l8 threaded thereon form a link, which connects the bar 6 with the bar I8. At 1, the free end of the sleeve I8 is pivoted to a projecting part of the bar 6, while the free end of the rod 8 is pivoted to the member 9 adjustably arranged on the bar I8. A lock nut 28 secures the position of the rod 8 and the sleeve 8 with respect to each other.

The bar 6 has a recess 2|. A shaft 22 providedwith a projecting lever 23 is journalled in the lugs 3 and 4. Furthermore, a weft needle 24 is secured to the shaft 22 by means of a screw 25. Opposite the weftneedle 24, the loom slay is provided with a recess 26, into which the weft needle 24 may fall. 21 indicates a reed and 28 indicates the flying shuttle.

The above described device represents a normal weft thread guard, which operates as follows:

During the operation of the loom, the loom slay reciprocates to and from the breast beam As long as no disturbance occurs, i. e. as long as neither the weft thread breaks nor the shuttle bobbin becomes empty, the bar l0 and the member 9 remain in their normal position, as the spring |5 counteracts a displacement of the bar l8 to the right hand. The bar 6, however, is shifted along the loom slay i. e. if the loom slay approaches the breast beam, the bar 6 is moved to the left hand, and if the loom slay leaves the breast beam, the bar 6 is moved to the right hand.

The weft needle 24 rests on the thread during each shot and retains the lever in a level above the recess 2|. so that the bar 6 may reciprocate along the loom slay. If, however, due to a breakage of the weft thread, the weft needle has no thread to rest on, the needle falls downwardly and the lever 23 engages with the recess 2|, as soon as the latter is moved below the lever 23. This engagement between the lever 23 and the recess 2| occurs at the particular moment, when the loom slay has covered about half of its distance from its furthest rear position to the breast beam, so that from now on the bar 6 is locked with respect to the loom slay and the continuation of the movement of the loom slay towards the breast beam causes a movement of the bar in to the right hand by means of the link l8, 8 against the action of the spring l5. This movement of the bar to the right hand is used to start the stopping operation aswill be explained hereinafter.

Referring toFig. 5, the bar I8 extends through the casing 29. An adjusting collar 30 is mounted on the bar l8 within said casing 29, as shown in Fig. 6. A lever 32 carrying a roller 33 is pivoted to the casing 29 at 3|. In the normal position of the bar lo, the roller 33 rests on the adjusting collar 30 and presses the left-hand end of the lever 32 against the upper end of a pin 34 carrying a contact bridge 35, so that the bridge 35 is removed from the stationary terminals 31 against the action of a spring 36 arranged between the bridge 35 and the wall of the casing 29 and the switch is in its open position. A screw 38 passes through a hole of the adjusting collar 38 and is arranged in a direction parallel to the bar In. A lock nut 40 prevents an undesired rotation of the screw 38. A second adjusting collar 39 provided with a threaded hole is threaded on the screw 38 at a distance from the first adjusting collar 38. The distance between said two collars may be changed by a rotation of the screw 38.

If due to a disturbance the bar It is shifted to the right hand as mentioned above, the collar 38 disengages from the roller '33, so that the spring 36 moves the contact bridge 35 upwardly against the terminals 31 and the switch is closed. Together with the bridge, the pin 34 and the left-hand end of the lever 32 are moved upwardly. If the bar I8 is moved further to the right hand, the collar 39 engages with the roller 33 and presses the pin 34 with its bridge 35 downwardly, so that the switch is opened again. Therefore, the switch is closed only for the time duringwhich the bar In is moved for the distance between said two collars '38 and 39.

As will be explained hereinafter, the closing of the switch 35, 31 causes the braking of the electrical driving motor by reverse current and at the same time excites a buffer and friction brake.

As shown in Figs. 3' and 5, a casing 4| is attached to the 100m slay below the right-hand end of the bar 6. A pawl 43 arranged in said casing may swing about a pivot 44. Furthermore, an electro-magnet 42 shown in Fig. 1 is arranged in said casing, and its armature is connected to said pawl 43. During the normal operation of the loom, the nose 46 of the pawl 43 the recess 45 comes in alignment with the nose 46. The recesses 2| and 45 are arranged in such a way, that at the same time the recess 2| is below the lever 23 the recess 45 is above the nose 46. Therefore, the excitement of the electromagnet 42 will have the same effect as the engagement of the lever 23 with the recess 2| after a downward falling of the weft needle 24. As

soon as the nose 46 has been engaged with the recess 45, this-engagement continues independent of the fact whether or not the electro-magnet is still excited, until the loom slay reverses its direction of movement after having reached the breast beam, whereby the bar 6 is moved to the right-hand and the recess 45 becomes dis-- engaged from the nose 46.

Referring now to Fig. 7, 48 indicates a disk, which is keyed on the loom shaft 41. A second disk 50 is loosely arranged on the hub 49 of the first disk 48, so that said two disks may be rotated relatively to each other. The disk 48 has two lugs 51 and 58, the disk 58 has two lugs 5| and 52. Springs 53 and 54 are arranged between the lugs 5| and 51, springs 55 and 56 are arranged between the lugs 52 and 58 in the following manner: Screw bolts 59 and 68 provided with holes 6| and 62 respectively are secured to the lugs 51 and 58 of the disk 48. Furthermore links or levers 65 and 66 are swingably mounted on the disk 50 at 63 and 64 and carry pins 61 and 69. Flat connecting members 68 and 18 provided with holes 1|, 1| and 12, 12' respectively are rotatably mounted on said pins 51 and 59. Screwj bolts 13 and I4 provided with holes I3 and 14' respectively are secured to the lugs 5| and 52 of the disk 58. The ends of the spring 53 areinserted in the holes I3. and 'II', the ends of the "spring 54 are inserted in the holes TI and 8|, the ends of the spring 55 are inserted in the holes I4 and I2 and the ends of the spring 58 are inserted in the holes I2 and 82. Thus, the springs 53 and 54 on the one hand, and the springs 55 and 58 on the other hand, are stretched between the disks 48 and 58, whereby the levers and 56 keep the springs away from the flange I5 of the disk 48.

In'the plane of the lug 5|, a stop rod nib I8 is rotatably mounted on a pin 11 secured to the side wall of the loom. An arm 18 provided with a series of holes 19 is rigidly secured to the stop rod nib 16. v A plate 88 secured to the side wall of the loom by means'of screws has an eye 8|. .One

. the arm 18. A lever 88 having an indention 81 is arranged on the bolt I3 secured to the lug 5| of the disk 58. A rubber buffer 88 presses the lever 88 against the end of the spring 53 which is inserted into the hole 13' of the bolt I3.

If the braking electro-magnet 83 is excited, the armature thereof swings the'stop rod nib T8 by means of the chain 85 and the arm 19 in a counterclockwise direction, so that the stop rod nib 16 comes into the path of the rotating lug 5|. Thus, the stop rod nib 15 engages with the indention 81 and prevents the disk 58 from further rotation.

Referring to Figs. 7, 9 and 10, a pawl 98 is swingably arranged on a pin 89 secured to the disk 48. The swing movement of said pawl 98 is limited to a certain angle by means of two locking'means 9| and 92, which in a preferred embodiment have the form of a ball cooperating with indentions,.so that the pawl, if slightly pushed either by the projection 98' of a plate 96 secured to the disk 58 or by a stop rod nib 95 .described hereinafter, may easily swing from one end position into the other end position; In the position shown in Fig. 9, the locking means 9| is effective; if, however, the pawl 98 is swung through the possible angle, the other locking means 92 becomes efiective and furthermore a projection or lug 93 of the pawl 98 abuts against the lug 58 of the disk 48. The lug 58 prevents a rotation of the pawl 98 in a clockwise directionfwhile the locking means 92 prevents a rotation of the pawl in a counter-clockwise direction.

The second stop rod nib 95 is rigidly arranged on a plate 94 screwed on the side wall 288, as shown in Fig. '7. This stop rod nib 95 is in the plane of the pawl 98, but is outside of the path thereof, if the pawl 98 rotating with the rotating disk 48 is in the position relative to the latter as shown in Fig. 7. If, however, the stop rod nib 76 stops the disk 58 in the above described manner and the non-arrested disk 48 moves relatively to the disk 58, the edge 9'! of the pawl 98 rotating with the rotating disk engages with the projection 98' of the plate 98, whereby the pawl 98 is swung about its pivot 89 in a clock-wise direction and is brought into the end position, in which the other locking means 92 becomes effective.

I82 engages with the abutment I83,

Then, the stop rod nib 95 is in the path of the pawl 98, if at a later interval the movement of the disk 48 is reversedin a counterclockwise direction as will be described hereinafter.

Referring now to Figs. 9 and 10,'brake shoes 98 are disposed within the casing formed by the above mentioned flange 15 of the disk 48 and are pressed against said flange I5 by means of springs 99. The brake shoes 98 are provided with lugs I88 forming a catch for pins |8| secured to the disk 58. Thus, if the disks 58 and 48 are rotated relatively to each other, the pins |8| tend to rotate the brake shoes 98 relatively to the flange 15 of the disk 48 by means of the lugs or catches I88, whereby a braking effect is obtained.

The lug 58 of the disk 48 has an extension or stop I82 as shown in Figs. 7 and 9, which during a relative movement of the two disks 48 and 58 with respect to each other may engage with an abutment I93 attached to the disk 58.

The operation of the combined buffer and friction brakes-is as follows:

During the operation of the loom the shaft 41 rotates'i'n a clock-wise direction, whereby the disk 48 keyed on the shaft 41 and the disk 58 loosely arranged on the hub 49 of the disk 48 but connected with the disk 48 by springs are rotated in the same direction. As soon as a disturbance occurs, the electro-magnet 83 is excited in a manner explained hereinafter. The excited electromagnet swings the stop rod nib 15 into the path of the indention 81, so that the latter engages with the stop rod nib 15 to cause an arresting of the disk 58. The disk 48, however, continues its rotation under the influence of the kinetic energy inherent in the moved masses, so that the springs 53, 54, 55, 58 are stretched due to the 4 relative movement between the disks 48 and 58. The rotation of the disk 48 is continued until the stop I82 abuts against the abutment I83 or the kinetic energy of the moved masses of the loom is consumed by the braking efiect of the brake shoes 98 cooperating with the flange I5 of the disk 48. During this period, the driving electro-motor is switched to reverse current by means of the above mentioned switch 31.

Shortly before the stop I82 abuts against the abutment |8 3,'the driving electro-motor is entirely disconnected from the network as will be explained hereinafter in more detail during the description of the remote control. If the stop the buffer springs are stretched. Then, the force inherent in the stretched springs becomes active and returns the disk 48 to such a degree, that the pawl 98, which during the above mentioned relative movement between the disks 48 and 58 passed the projection 96 of the plate 96 and has been swung by the latter into its effective position, abuts against the-stop rod nib 95. This engagement of the pawl with the stop rod nib as results in a positive arresting of the loom and takes place at the moment, when the loom slay is in its furthest rear position. If, after the removal of the disturbance, the driving electro-motor of the loom is restarted, the shaft 41 and disk 48 are rotated in a clock-wise direction, whereby shortly before finishing one rotation the curved edge I 84 of the pawl 98 contacts with the inner edge I85 of the stop rod nib 95. This contact causes an impact, which returns the pawl 98 into its normal position shown in the figures, in which it is held by the locking means 9|. As long as the pawl 98 remains in said normal position, the pawl does band and its edge I is somewhat inclined, so

that in case of a too heavy recoil of the loom slay the stop rod nib is bent downwards and the curved edge I04 of the pawl passes along the inclined edge I05 of the stop rod nib thereby producing a certain braking eii'ect.

As mentioned above, the movement of the disk 48 relatively to the disk 50 also causes the friction brake 98 to act. The friction brake is effective during the braking operation proper for stopping the loom as well as during the return of the loom slay into its furthest rear position.

Thus,- the active braking operation isobtained by combining the resulting effects of the braking by reverse current, the buffer brake and the fric-' tion brake. This combined action of the three different kinds of .braking permits a safe and positive control of the extraordinarily short braking path determined by the distance between the stops I02 and l03, so that it is possible to arrest the loom slay before it reaches its furthermost position. Due to the electrical braking by reverse current, the hitherto usual disengageable clutch between themotor and the loom may be omitted.

If the loom slay would be returned into the position of the open shed by the action of the buffer springs alone, the accumulated energy of the buffer springs must be entirely discharged during this operation, as otherwise a too heavy impact of the pawl 90 on the stop rod nib 95 would occur. In order toobtain the correct proportions, the friction brake is set in action at the same time, so that the latter partly consumes the discharge energy of the buffer springs.

One of the possible disturbances is the so-called shed breakage, which occurs if the flying shuttle fails to reach the opposite shuttle box and is trapped in the shed during its movement. Such a disturbance may be prevented, if the loom is arrested in due time, and for this purpose the well known device comprising a frog and a stop rod nib has been used, wherein the stop rod nib, which during the normal operation passes over the frog, drops into the frog and arrests the loom at once in case of ashed breakage. The impact of the stop rod nib on the frog is. however, of very high intensity and often causes frame breakages.

According to the embodiment of my invention shown in Fig. 2, the frog I05 is rotatably mounted on the pivot I01 arranged on the frame of the,

carrying a'brake shoe 5 at its right-hand end is swingably mounted on a pivot II3 attached to the side wall of the loom. A spring Il8 stretched between the side wall of the loom and the lever II4 draws the brake shoe II5 against the seg-.

ment H2. The stop rod nib H1 is rotatably mounted on a pivot II8 secured to the loom slay. A lever H9 is rigidly connected to the stop rod nib II1. A spring I stretched between the stop rod nib I I1 and the loom slay urges the lever I I9 against a wedge I2I.

Fig. 2 shows a sectional view of the shuttle box. If the shuttle is is in the box as shown in Fig. 2, the lever H9 is pressed to the left and the stop rod nib II1 remains in itselevated position against the action of the spring I20.

Therefore, the stop rod nib passes over the frog, if, the loom slay is moved forward.

If, however, the shuttle has not yet entered the box at the moment when the stop rod nib is in rear of the frog, the spring I20 draws the stop rod nib. downwards, so that its free end engages with the abutment I22 of the frog and turns the frog in a'clock-wise direction, whereby the projection I23 of the frog engages with an electrical switch I24 mounted in the side wall of the loom and opens the switch. This opening of the switch resultsin a disconnecting of the motor driving the loom from the network, as will be explained hereinafter.

The impact of the stop rod nib II'I on the frog is retarded by the spring I08, which is thus tensioned. Furthermore, the friction brake formed by the segment H2 and the brake shoe II5, smooths and reduces the impact.

Preferably the spring I08 has such a strength, that it entirely dampens the impact of the stop rod nib on the frog and in addition thereto is able to return the loom slay into the position of the open shed. The discharge energy of the spring I08 is dampened by the cooperating friction brake H2, H5.

Fig. 1 shows theessential parts of the loom, the

driving motor, its connection with the loom slay,

,current through the reversing switch I21, which is controlled by switch coils I and I3I, and

through the three-phase-lines I26a, I281), I260.

The outline of the reversing switch I21 is shown by dash and dotted lines.

The reversing switch comprises the two switches I28 and I29. The switch I28 serves to switch the motor to normal direction of rotation as necessary for the normal operation of the loom, while the braking switch I29 serves to switch-the motor to a reversed direction of rotation, in order to obtain a braking effect by re-' verse current. The switch coil I30 controls the switch I28, and the switch coil I3I controls the switch I29. The.on push button I32 serves to start the device, and the 0 "-push button I33 serves to stop the device.

The two switches I28 and I29 are also me chanically connected with each other. Each switch has a plurality of individual contactfingers I28a.-I28e and I29a-I29d respectively. A switching rod I34 provided with a pin I35 at its left-hand end connects the individual contactfingers I28a-I28e of the switch I28 with each other. The individual contact fingers l29a--I29d of the switch I29 are connected with each other in a similar manner by a switching rod I35 having a pin I31 at its left hand end. A bar I40 swingably mounted on a pivot I4I secured to the frame of the reversing switch has two enlarged ends provided .with slots I38 and I39. The pin I35 engages with the slot I38, and the pin I31 engages with the slot I39.

If the coil I30 is excited, the rod I34 is shifted to the right-hand and moves the contact fingers of the switch I28 connected therewith into their closing position. At the beginning of this shifting, the pin I35 slides unobstructedly within the slot I38. If, however, at the end of this shifting the pin I35 abuts against the right-hand end of the slot I38, the rod I34 turns the bar I40 about the pivot I in a countereclockwise direction, whereby the slot I39 passes freely along the pin I31 without catching the rod I36 of the switch I29. When the shifting of the rod I34 is completed and the contact fingers of the switch I28 are in closing position, the pin I31 of the rod I36 is about in the center of the slot I39 which passed for a certain distance along the pin. I31 as mentioned above. If the coil I3I is then excited, the latter draws the rod I36 to the right-hand, whereby at the beginning of this shifting of the rod I36, the pin I31 slides unobstructedly within the slot I39, until it abuts against the right-hand end of the slot I39. This unobstructed shifting of the rod I36 is used to interrupt the exciting circuit of the coil I30 as will be explained hereinafter. During the further shifting of the rod I36 to the right hand, the pin I31 engaging with the right-hand end of the slot I39 turns the bar I40 about its pivot MI in a clock-wise direction, whereby the right-hand end of the .slot I38 engaging with the pin I35 draws the rod I34 to the left-hand, so that the remanent magnetism in-, herent to the coil I30 is overcome and the switch I28 is opened. 1

In order to start the operation of the loom, the spring loaded on-push button I32 is pushed downwards for a short time, so that its contact bridge I32a contacts the lower terminals I32 and I32. The following circuit is thus completed: From the conductor of the network through the fuse I42 and the switch coil I30 to the point a; from this point a. through the terminals I32, I32" bridged by the contact bridge I32a and the line I41 to the conductor T.

Thus, the coil I30 is excited and draws the switching rod I34 to the right-hand, so that the main contact fingers I280, I28d, I28e and the auxiliary contact fingers I280, [28b of the switch I 28 are brought in closing position. The onpush button, which is pressed downwards only for a short time, is returned by its spring into its normal position, in which the lower terminals I32 and I32 are open but the upper terminals 232' and 232" are closed by the bridge I32a. The excitement of the coil I30 continues, however, as the following holding circuit for the coil I30 is closed by'the auxiliary contact finger I28b of the switch I28: From the conductor S through the coil I 30 to the point a; from this point a to the terminal I43 of the auxiliary contact closed by the contact finger I28b, then'through said cone tact finger I28bto the terminal I45 of the auxiliary'contact controlled by the switch I29, then through the contact finger I29a and the line 245 to the upper left-hand terminal I46 of a switch controlled by a push-button I 46, then through the left-hand contact bridge 611 secured to the push-button, through the lower left-hand terminal"I46- of said switch, through the closed switch I24 (controlled by the frog; I06 as shown tion, and the electro-motor I 25 receives current from the conductors R, S, T, through said main contact fingers and the lines 126a, I26b, I28c. Thus, the motor is started and drives the loom.

If a. shed breakage occurs, the contact I24 is opened automatically, so that the holding cur-' rent circuit for the coil I30 is interrupted and the switch I28 is opened under the influence of the spring 230. The motor I25 and the loom con-. nected thereto are stopped. This action is accelerated by means of the bufierbrake I08 and the friction brake H2, H5.

As soon as a difierent disturbance occurs, the switch 35, 3'! (Figs. 1 and 6) is closed as described above, so that the following exciting circuit for the magnet coil I3I controlling the switch I29 is closed; From the conductor S through the fuse I42 to the point 0, then through the coil I3I to the point b, then through the line I48 to the lower right-hand terminal 246" of the switch controlled by the push-button I46, then through the right-hand contact bridge I46b, of said switch to the upper right-hand terminal 246, then through the line 346, through the terminals 232' and 232" closed at this time by contact bridge I32a, through the line I49, through the closed switch 35, 31, through the line I50-to the open terminal I5I, then'through the line 250 to the terminal I44, then through the contact finger I28a contacting the terminal I44 at this moment, through the lines 244 and 245, through the left-hand terminals I46, I46" of the switch I46, through the switch I24, through the line I41 to the conductor T. i

the 25 Thus the coil I3I is excited and draws the rod 35 I36 to the right-hand, whereby, the contact-fingers I29a-I29d connected with said rod I36 are brought into their closing position. During the first partoi this movement of the rod I36, 1. e.

during the idle passing of the pin I31 in the slot 40 hand. During this second part of the movement of the rod I36, i. c. after the engagement of the pin I31 with the right-hand end of the slot I39,

the main contact-fingers I29b, I29c and I29d are brought into their closing position, whereby at the same time all contact-fingers I28a--I28e of the switch I28 are brought into their open position, as the coil I3I draws the rod I34 to the left-hand into the position shown in Fig. l by means of the rod I36, pin I31, lever I40 and pin I38. The closing of the maincontact-fingers I 29b, I29e and I29d of the switch I29 causes the braking of the I electro-motor I25 by reverse current.

One end of the coil of the} metroagnet a3 is connected to the point b, the otherend-thereof is connected to the point 0, so that the coil of the electro-magnet and the'exciting coil I3I are connected in parallel and are excited at the same time. As described above, the electio-mag- 10 net 83 controls thebuifer and friction brake,.so

' that the latter are brought into eifect simultaneously'with the' braking by reverse current.

Shortly before the stop I02 (Fig. 7) abuts against the abutment I03, the controlling switch 78 35, 31 (Figs. 1 and 6) is opened, as at this moment the adjusting collar 33 is engaged with the roller 33 and removes the contact-bridge 35 from the stationary terminals 31. This opening of the switch 35, 31 interrupts the exciting circuit for the coil I3I, so that a spring 23I may return the rod I36 into the position shown in Fig. 1, whereby the main contact fingers I23b,

I230, I23d are brought into open position and the braking by reverse current is terminated. Then, the combined buifer and friction brake produces an after-effect, as the stretched buffersprings tend to contract and the' friction brake is still effective during the contraction of the springs. During this phase of the arresting operation, the loom slay is returned by the contraction of said springs into the position of the open shed, whereby a positive arresting of the loom occurs due to the engagement of the stop rod nib 35 with the pawl 30.

The above described sequence of arresting steps, which occurs automatically in case of a disturbance and substantially consists in the braking by reverse current,,by a buffer and by friction, may also be started arbitrarily by hand, if a spring-loaded push-button I33 is pressed downwards for a short time, so that the contactbridgel33a secured, thereto-connects the lower terminals 232' and232" with each other, whereby the electro-magnet 42 connected to said terminals is excited and lifts the pawl 43 (Fig. 3). Thus, the nose '46 of the pawl 43 engages with the recess 45 of the bar 6 at the particular moment, when the loom slay I is in the position, in which the bar 6 would be locked by the lever 23 cooperating with the recess 2I in case of a disturbance. In this manner, the switch 35, 31 is also closed, if the loom slay, continues its movement against the breast beam. The exciting'circult of the electro-magnet 42 is connected to the secondary winding I53 of a transformer, the primary winding of which is formed by the switch 'coil I30. Therefore, it is necessary, that the coil I30 be excited, in order that the winding I53 of the transformer be under tension, 1. e. that the electro-magnet 42 can be excited. If the stop push-button switch I 33 is pressed, the exciting circuit of the electro-magnet 42 is as follows: From one end of the secondary winding I53 through the point (1, through the line I54, to the lower terminal 233", thenthrough the contact bridge I33a to the terminal 233', then through the line 254 to the point f, then through the line I55, through the coil of the electro-magnet 42, through the line I56 to the point 9, and from this point back to the other end of the secondary winding I53.

The excitement of the magnet 42 results in the closin'g of the controlling switch 35, 31 and the excitement of the braking electro-magnet 83 for a short time, as will be easily understood by the foregoing explanations so that the pressing of the push-button I33 of the hand switch likewise produces a braking by reverse current of brief duration, renders active the combined buffer and friction brakes and arrests the loom in the position of the open shed. It does not matter that after a certain period no current fiows through the coil I30 and the winding I53, as it is only necessary that the nose 46 of the pawl 43 becomes engaged with the recess 45 of the'bar 6. Then the further movement of the loom slay exerts the necessary pressure on the bar 6 to hold the nose 46 in engagement with the recess 45.

It may be noted, that the specific mechanical coupling of the two electrical switches I28 and I23 through the medium of the lever I40 and pin and slot connection I35, I31, I38, I33 permits an immediate closing of the switch I23, al-

though the coil I30 is still-excited, if the closing 5 the 'coil no and tends to prevent the switch 128.

from being opened instantaneously, is at once overcome by the action of the coil I3I, which is now excited.

1 A switch I 51 is connected in parallel to the lower terminals 233' and 233' of the switch controlled by the push button I33. This switch is automatically closed, if a breakage of the warp threads occurs, and starts the same sequence of steps as they are initiated by pressing down the push-button I33.

3 Fig. 11 shows a device known per se for closing the contact I51. For the sake of clarification the warp threads I60 are shown spaced from each 5 other for a comparatively large distance, although they are arranged closely toeach other in the loom. A metallic segment I 5| provided with a slot I62 is suspended from each warp thread I60. A guide rod I63 passes through the slots I62 and is secured to the loom frame at both' ends. Said rod serves to guide the segments, if they drop due to a breakage of the warp threads. Bus-bars I64 and I65 are arranged below said segments I6I. Each of said bus-bars is connected with a conductor of the network. The bus-bars extend across the entire width of the loom. The ends of the bus-bars are secured to the loom, insulations being arranged between the loom and the bus-bars.

If a warp thread breaks, the respective segment I6I suspended therefrom drops and causes an electrical connection between the two bus-bars I64 and I65. This operation represents the clos-. ing of the contact I51 diagrammatically shown in Fig. l.

The exciting circuit for the coil I3I includes the upper terminals 232' and 232" of the pushbutton switch I32 as described above. As, after the insertion of a new shuttle bobbin, the weft thread does not as yet lie below the weft needle 24, the loom would be arrested at once, if the push button I32 pressed down to start the operation. of the loom, would not be kept in this pressed position with its bridge I32a remote from the terminals 232' and 232", until the first shot occurred, as-otherwise the weft needle 24, which has no thread to reston, would initiate the arresting of the loom by closing the exciting circuit for the coil I 3| including the terminals 232' and 232". As soon as the first shot is completed, a. weft thread lies below the weft needle 24. Thus, if the push-button I32 is kept down during the restarting operation of the loom after the insertion of a new shuttle bobbin, until the first shot has been completed, and then will be released and returned by its spring into the position shown in Fig. 1, whereby the bridge I-32a contacts the upper terminals 232' and 232", the loom will not-be arrested at once, as now a weft thread lies below the weft needle 24, and the weft thread guard will act in its normal manner after the occurrence of a disturbance.

As described above, the switch I28 remains in its closed position by means of the holding cir- .disturbance guard due to cuit forthe coil I30 including the auxiliary switches I29a, I45 and I281); I43, if the pushbutton I32 returns into its upward position shown in Fig. 1 after'having been pressed down for a short time to start the operation of the loom.

This holding circuit also includes the terminals of the push-button switch I46. Furthermore, the disturbance circuit .or exciting circuit for the coil I3I completed by the closing of the switch 35, 31 also includes the terminals of said pushbutton switch I46. 1 Thus, if only short movements of the loom slay shall be initiated by pressing the push-button I32, the holding circuit as well as the disturbance circuit, which may be completed by the weft thread guard through the switch 35, 31, must be interrupted, so that on the one hand short movements of the loom slay corresponding to the time of pressing the push-button I32 are obtained and on the other hand the weft thread guardcannot become effective during these short movements. For this purpose, the interrupting push-button switch I45 has tobe pressed down into a position, in which its bridges I46a and I46b are disengaged from the terminals I46 and 246', in' order to interrupt the above mentioned circuits and render possible short movements of the loom slay by pressing the push-button I32. The push-button I46 is not spring loaded andremains in its pressed position, until after the completion of the short movements the push-button I46 is returned by hand -into its operative position shown in Fig. 1.

As will be easily understood from the above explanations, the electrical remote control not only renders possible the normal switching on and switching off of the electro-motor driving the loom, but also renders possible the obtaining of the desired arresting operation under the action of the various kinds of brakes irrespectively of the fact, whether the impulse for the arresting operation is given arbitrarily by hand or by the the occurrence of a disturbance. The described control also renders possible the production of short movements of the loom slay and the prevention of the effectiveness of the weft thread guard prior to the first shot after the start of the loom.

I have described a preferred embodiment of my invention but it is clear that numerous changes and omissions may be made without departing from the spirit of my invention.

What I claim is:

1. A mechanism for stopping electrically driven looms comprising: a loom having a loom shaft,-;a reciprocating loom slay, means connecting said loom shaft with said loom slay; an electro-motor having a driving shaft; means connecting said driving shaft with said loom shhft; a buffer brake arranged on said loom shaft; a friction brake mounted on said loom shaft; controlling means arranged on said loom and adapted to operate in case of a disturbance; a braking switch electrically connected to said electro-motor and adapted to produce a braking of the electro-motor by reverse current; a braking electro-magnet adapted to render active said buffer and friction brake; a controlling switch adapted to be actuated by said controlling means and electrically connected to said braking switch and said braking electro-magnet; means arranged on said buffer brake to determine a positive braking path upto a predetermined front position of the loom slay; resilient means arranged on said buffer brake adapted to return the loom slay mom said predetermined front poa breast beam,

sition into its substantially furthest rear posi-' tion; and means timing the brakes in such a way, that the braking by reverse current, by buffer and by friction become active at the same time, whereupon the braking by reverse current is stopped shortly before the buffer brake arrests the loom slay in the predetermined front position, whereupon the friction brake alone remains active during the return of the loom slay into its rear position by said resilient means.

2. In a mechanism according to claim 1 the arrangement of a stop adapted to arrest positively the loom shaft after the return of the loom slay into its furthest rear position by said resilient means.

3. In a mechanism according to claim 1, said buffer brake comprising two disks, one of said disks being rigidly connected to said loom shaft, the other disk being loosely arranged on said loom shaft; springs stretched between said disks; a stop rigidly mounted on said loosely arranged disk; a stop rod nib movably arranged on said loom and adapted to cooperate with said stop; and connecting means disposed between said stop rod nib and said braking electro-magnet to render possible a movement of said stop rod nib into the. path of said rigid stop by said braking electro-magnet.

4. In a mechanism according to claim 1, said buffer brake comprising two disks, one of said disks being rigidly connected to said loom shaft, the other disk being loosely arranged on said. loom shaft; springs stretched between said disks; a stop rigidly mounted on said loosely arranged disk; a stop rod nib movably arranged on said loom and adapted to cooperate .with said stop for rendering effective said buffer brake and producing a relative movement between said two disks; connecting means disposed between said stop rod nib and said braking electro-magnet to render possible a movement of said stop rod nib into the path of said rigid stop by said braking electromagnet; a pawl pivotally mounted on said loosely arranged disk; a lug rigidly mounted on saidand arranged in the path of said pawl swung into operative position, said additionalstop rod nib cooperating with said pawl to stop the loom returned by said springs and returning said pawl into its inoperative position during the normal rotation of said disk.

5. In a mechanism according to claim 1, said buffer brake' I-fbomprising two disks, one of said disks being rigidly connected to said loom shaft, the other disk being loosely arranged on said loom shaft; springs stretched between said disks; a stop rigidly mounted on "said loosely arranged disk; a stop rod nib movably arranged on said loom and adapted to cooperate with said stop for rendering effective said bufler brake and producing a relative movement between said two disks; connecting means disposed between said stop rod nib and said braking electro-magnet to render possible a movement of the disks; said friction brake comprising a flange arranged on said rigidly mounted disk and spring-loaded brake shoes positively connected to said movably mounted disk, said brake shoes cooperating with said flange during the relative movement of said two disks; and an additional stop rod nib rigidly mounted on the loom and arranged in the path of said pawl swung into operative position, said additional stoprod nib cooperating with said pawl to stop'the loom returned by said springs and returning said pawl into its inoperative position during the norma rotation of said disk.

6. A mechanism according to claim 1 in combination with an electrical remote control, said controlling means being adapted to actuate said electrical remote control, and said electrical remote control being adapted to actuate said brakes.

7. A mechanism according to claim 1 in 'combination with an electrical remote control, said controlling means being adapted to actuate said electrical remote control, a hand stop switch being adapted to actuate said electrical remote control, and said electrical remote control being adapted to actuate said brakes.

8. A mechanism according to claim 1 in combination with an electrical remote control, said controlling means being adapted to actuatesaid electrical remote control, a hand stop switch, locking means adapted to render operative said controlling means in the same position as in case of a disturbance, said locking meansbeing electrically connected to said hand stop switch, and said electrical remote control being adapted to actuate said brakes.

9. In a mechanism according to claim 1 a cam arranged on said loom slay, said cam being adapted to open said controlling switch in the front position of the loom slay for terminating the braking by reverse current.

10. A mechanism according to claim 1 in combination with an electrical remote control, said controlling means being adapted to actuate said electrical remote control, a frog pivotally mounted on'said loom, a stop rod nib arranged on said loom slay and adapted to rotate said frog, a brake and dampening means adapted to'darnpen the movement of said frog, and a switch adapted to actuate said electrical remote control, said frog being adapted to control said .switch, and said electrical remote control being adapted to stop said electro-motor and to actuate said brakes.

l-l. A mechanism according to claim 1 in com bination with an electrical remote control, a hand on"-switch and a hand off-switch arranged in the circuit of said electrical remote control adapted to start and terminate the normal operation of the loom, said controlling means being adapted to actuate said electrical remote control, and said electrical remote control being adapted to actuate saidbrakes.

12. A mechanism according to claim 1 in combination with an electrical remote control, a spring-loaded .hand on-switch and a springloaded hand ofl"-switch arranged in the circuit of said electrical remote control, said on-switch having a pair of upper terminals and a pair of lower terminals the lower terminals being included in the circuit adapted to startthe electromotor, the upper terminals being included in the circuit connected to said controlling switch, the spring urging the on-switch against said upper terminals, said controlling means being adapted to actuate said electrical remote control, and said electrical remote control being adapted to actuate said brakes.

13. A mechanism according to claim 1 in combination with an electrical remote control, a spring-loaded hand on-switch and a springloaded hand ofi"-switch arranged in the circuit of said electrical remote control, said on-switch having a pair of upper terminals and a pair of lower terminals, the lower terminals being in-- cluded in the circuit adapted to start the electromotor, the upper terminals being included in the circuit connected to said controlling switch, the spring urging the on"-switch against said upper terminals, and an interrupting hand switch, said interrupting hand switch being included in the holding circuit ofthe remote control for themaintenance of the operation of the loom and in the circuit including said controlling switch, said in terrupting hand switch being adapted to remain in a position interrupting said circuits, said controlling means being adapted to actuate said 1 electrical remote control, and said electrical remote control being adapted to actuate said brakes. 5

WILHELM LOHSSE.

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