US2098444A - Mechanical warp stop motion - Google Patents

Description

Nov. 9, 1937 T. c. WAGNER MECHANICAL WARP STOP MOTION Filed Oct. 50, 1955 6 Sheets-Sheet l s R w m W A C& e 0. M M

Nov. 9, 1937. T. c. WAGNER MECHANICAL WARP STOP MOTION Filed occ. so, 1955 s Sheets-sheaf. 2

N INVENTOR. 1\ Tb z-oooe C. W q/vze 1\ ATTORNEYS BY wwta T. C. WAGNER Nov. 9, 1937.

' MECHANICAL WARP STOP MOTION Filed Oct. 30, 1935 6 Sheets-Sheet 3 ATTORNEYS 6 mm a 2 MN 44 9 E6 WA W a a m c k W w 3 M m m w w m T w 4 w 2 M 8 6 7 1 fl r m. 1 w 9 9 9 y 1 a g In m Ma G p 2 f 00 9 W H 7 LI F Ill q 4 1 1 m W 3 Q4 ,1 9 Q Q Q 3 fi L I? NOV. 9, 1937. v 1 WAGNER 2,098,444

MECHANICAL WARP STOP MOTION Filed Oct. 30, 1935 6 Sheets-Sheet 4 WA /me flaw a ATTORNEYS NOV. 9, 1937. c, WAGNER 2,098,444

MECHANICAL WARP STOP MOTION Filed Oct. 30, 1935 e Sheet-Sheet s INVENTOR. 77/150,002 C. l l fia/vza ATTORNEYS Nov. 9, 1937. T. c. WAGNER MECHANICAL WARP STOP MOTION 1 Filed Oct. 30, 1955 6 Sheets-Sheet 6 INVENTOR. 7%:000/3 C. I I HOMEE UNETE STS MECHANICAL WARP STOP MOTION Theodor Curt Wagner, Chemnitz, Germany Application October 30, 1935, Serial No. 47,347 In Germany June 24, 1935 8 Claims. (01. 139360) This invention relates to looms, and refers then locked by the fallen heddle and in their locked more particularly to a mechanical harness warp position continue their common up and down stop motion for looms. movement until they nearly reach their upward An object of the present invention is the proposition, whereupon through the medium of other vision of a warp stop motion device which is simelements they actuate a device which is operple in construction, can be easily adjusted and atively connected with the knock-out mechanism can be easily kept under observation. of the loom. This impact between the element or Another object is the construction of a warp elements operated by the bars and the device opstop motion provided with heddles or drop wires eratively connected with the knock-out mecha- 10 and serrated bars which are not subjected to any nism does not take place if the spring mechanism 10 substantial or excessive stress. is able to cause the return movement of the ser- A further object of the present invention is rated bar, due to the absence of a fallen heddle. the provision of a mechanical warp stop motion, In cotton looms, wherein drop wires are used,

the heddles or drop wires of which can be moved the frame carrying the serrated bars remains along the serrated bars so that the harness may stationary, while the device operatively connect- 15 be conveniently strung up and new heddles may be ed with the knock-out mechanism carries out an easily added to the harness hanging in the loom. up and down movement relatively to the frame.

The above and other objects of the present in- In order to provide for a quick and convenient vention may be realized through the provision of removal and replacement of the serrated bars, the

a mechanical harness warp stop motion compris tubular bar is mounted in resilient supports which 20 ing a pair of serrated bars which carry out a comare attached to the harness frame but which may mon up and down movement while the heddles be easily moved whenever a serrated bar is to of the harness are reciprocated in the same dibe taken out. The resilient supports are prorection. One of these bars is movable lengthwise vided with means locking the serrated bars in in the direction of its longitudinal axis relatively their operative positions. to the other bar by a swinging mechanism which The device actuated by the impact with eleis actuated by a device independent of and sepaments operated by the serrated bars while said rate from the mechanism causing the up and bars are locked by a fallen heddle, is operatively down movement of the bars. The lengthwise connected with the knock-out mechanism of the 3g movement of one of the serrated bars takes place loom by a flexible cable movable within a stiif when the two bars and the heddles are in the tube. lower shed, i. e. in their lower position. The invention will appear more clearly from The two serrated bars preferably have the the following detailed description when taken in form of a rod situated within another tubular rod. connection with the accompanying drawings,

The teeth of the two bars are so disposed that showing by way of example preferred embodi- 35 when one of the bars is rotated from its operative ments of the inventive idea.

position to an inoperative position, through an In the drawings: angle of 180, the teeth of the two bars will not Figure 1 is a diagram illustrating a loom. p oje nd their Operative Surfaces Which are Figure 2 is a front view of the harness stop mo-. adapted to carry heddles falling upon them after tion and the knockout mechanism constructed in 40 the breallase of the W accordance with the principles of the present in- Irrespectrve of the time at which a warp thread Vention. has been broken and a heddle has fallen down Figure 3 is a side elevation of the device operatupon the serrations of the two bars, the up and down movement of the bars is continued until the bars have practically completed their next upward movement, whereupon the stop motion device is automatically actuated. This feature is accomplished by providing serrations of such ends of a tubular senta'ted 5O shape that one of the serrated bars is moved Figure 5 15 Sectlon along the lme 5 5 of lengthwise by the swinging mechanism even if a Figure heddle has already fallen upon the bars. On the i ur 6 i a c ion al n the 11118 of other hand, the return movement of that bar, Figure which is caused by a spring mechanism, is pre- Figure 7 is similar to Figure 4 and shows the 35 vented by the fallen heddle. The two bars are device in its inoperative position.

ing the knock-out mechanism on a larger scale. Figure 4 shows a portion of the serrated bars in operative position and adjacent elements.

Figure 4a is a perspective view of one of the Figure 8 is a section along the line -45 of Figure 6.

Figure 9 is a front view of a part of the knock out mechanism.

Figure ll) is a perspective view of stop frame shown in Figure 2.

Figure 11 shows a heddle carrying a thread.

Figure 12 is similar to Figure 11 and shows a heddle, the thread of which was broken.

Figure 13 shows a harness stop motion of a somewhat different type; and

Figure 14 is a section along the line Figure 13.

Figure 15 is a front view of a stop motion actuated by drop wires.

Figures 16, 1'7 and 13 show drop wires and serrated bars operated thereby.

The loom illustrated diagrammatically in Figure 1 of the drawings comprises a warp beam 55, a breast beam Eli and cloth roll ii. The warp threads l8 pass through healds or heddles it carried by two harness frames or warp stop frames I9. Only one of the two frames E9 is illustrated in Figures 2 and if) of the drawings.

the warp The frames M are reciprocated in the usual manner by treadles 52 which are actuated by the plates ii and which move on fulcrum pin we. The frames is are connected to the treadles !2 by straps or cords passing over rollers 9 (Figs. 1 and 2).

As shown in Figures 2 and 10, a harness frame I9 is provided with longitudinally-disposed bars 28 and 2! which are held by two brackets 22 and 23 (Figure 2).

The loom frame comprises a vertical bar 24 carrying a horizontally-disposed bracket 25 which is attached to the bar by a bolt 2'5 and which is provided with a horizontal slot 2'5. A guide member or a bolt 23 is situated within the slot 2'! and is used as a which is contact with the bracket during the up and down motion of the frame iii caused by the treadles l2.

A similar guide member '29 is situated on the opposite side of the harness frame is and is in contact with the bracket 23.? of this frame. The guide member 29 is situated within a slot 38 of a bracket which is attached to another portion of the loom frame not shown in the drawings.

A bent resilient support is attached to the bracket 23 substantially the middle thereof. A similar resilientsupport 3'3 is situated opposite the support 32 is attached to the bracket 22. The two resilient sup to 32 and extend substantially vertically and their lower ends carry a supporting wire which extends across the warp stop frame in the izontal direc ion.

The upper ends of the resilient supports 32 and 34 are firmly connected with annular supporting members El and respecti ely. As shown more clearly in Figures 4 a d 7 of the drawings, the annular member 3? is truly connected with the upper end of the resilient support 32 and is provided with a central opening The end of the resilient support 32 has a similar open-- ing 48.

A serrated bar extends through the openings 39 and 4d of the annular member 3'? and the support as well as through. an opening formed in the bracket The bar ri extends also through similar openings formed in the annular member the upper end of the resil' support 34 and the bracket 2.2. The two annular members Bl and are in contact with a tubular serrated bar 42 which surrounds the serrated rated portion 53.

The tubular bar 42 is provided with two proj-ections 43 situated diametrically opposite each other which fit into suitable recesses 44 formed in the adjacent surfaces of the annular member 3'5 (Fig. 4a) Similar projections 33 fit into recesses formed in the annular member 38 (Fig. 2). Due to this arrangement, the tubular bar 42 is held between the annular members 31 and 38 and is prevented from being unintentionally turned or rotated.

The tubular bar 42 is provided with a round end portion 45 and a cut-out serrated portion 46 which comprises a plurality of teeth 41 (Figs. 4, 5, 7 and 8). A curved edge surface 48 connects the serrated portion 46 with the end portion 45. Each of the teeth 41 comprises an abruptly inclined substantially vertical surface 49 and an oblique surface 58 forming a comparatively sharp acute angle with a horizontal plane.

The bar 4 l, the middle portion of which is situated within the tubular bar 42, comprises a tapered end 55, a round portion 52 and a ser- As shown in Figures 4 and '7, the serrated portion 53 of the bar 4! comprises the teeth 54. Each of these teeth is provided with an abruptly inclined substantially vertical surface 55 and an oblique surface 56 forming a sharp acute angle with a horizontal plane. As shown in Figure 4, the teeth 54 of the bar 4| extend in a different direction from the teeth 41 of the tubular rod 42, so that the abruptly inclined substantially vertical surface 49 of one of the teeth 41' is situated adjacent a similar surface 55 of one of the teeth 54. Due to this arrangement, a space 51 is formed between each pair of adjacent teeth 41, 54. The spaces 51 receive the heddles l3 which drop down into them as will be described hereinafter.

As shown in Figures 2 and 10, the smooth end 58 of the bar 4| passes through a suitable opening formed in the bracket 22 and projects beyond this bracket. The opposite tapered end M of the rod 4| is in contact with an angular lever 59 (Figs. 2, 4 and 7). A pivot 60 (Fig. 2) which carries the lever 59 is supported by a bracket 6|, which is carried by the bracket 23 of the frame I9. The lever 59 is provided with a bent portion 62 having an end 63 which is in contact with the adjacent surface of the bracket 23 (Figs. 4. and '7). The lever 59 is maintained in the position shown in full lines in Figure 2 by a leaf spring 63 which is attached by bolts or rivets 64 to the bracket 23.

Two fiat springs 65 are situated on opposite sides of the bent portion 62 of the lever 59 and are suspended therefrom by the pin 66. As shown more clearly in Figure 6, each of the springs 65 is situated in a separate cavity or cut-out portion 61 which is formed in the bar 4!. The edges 68 of the springs 65 are in engagement with the edges 69 of the cut-out portions 61 of the bar 4| (Figs. e and '7). Due to this arrangement, the serrated bar M is flexibly connected with the lever 59 and at the same time is prevented from being unintentionally turned or rotated.

The lengthwise reciprocating motion of the bar 4! in the direction of its longitudinal axis is carried out by means of a cam 10 which is adjustably mounted upon the crank shaft ll (Fig. 2). The device for driving the crank shaft H is of the usual type and is not shown in the drawings.

Due to the fact that the cam 10 may be adjusted relatively to its shaft II, it is possible to vary the time during which one of the serrated bars is moved relatively to the other bar by the pendulum lever 15, described hereinafter. While it is customary to carry out such movement at the lower shed position, it may take place either before or after the frame I9 reaches the lower shed position.

As shown in Figure 2, the cam I is provided with a raised surface I2 which is in engagement with a roller I3. The roller I3 is rotatably mounted upon a pin T4 of a pendulum lever I5, the upper end of which is oscillatably mounted in a pin I6 carried by the support 11. The support 17 is attached by rivets 78 to the horizontal beam I9, constituting a part of the frame of the loom and connected with the vertical bar 24.

The pendulum lever I carries a plate 89 which is provided with a horizontal slot 8| A spring 84 connects the lever I5 to the frame of the loom. A bolt 82 which holds the plate 80 in place upon the lever F5 passes through the horizontal slot 8| of the plate 89 and is also passed through the vertical slot 83, formed in the lever I5. Due to this arrangement, the plate 80 is adjustable upon the lever I5, both in the vertical and horizontal directions.

The device for moving the serrated bars operates in the following manner:-

The swinging movement of the lever 15 caused y the cam 12 (Fig. 2) is timed in such manner in relation to the up and down movement of the frame I 9 caused by the treadles I2 (Fig. 1), that the plate 89 strikes the end 58 of the serrated bar 4| when the frame I9 carrying that bar 4| is in the lower shed. The bar 4| is moved in the direction of the arrow 85 shown in Figure 2, within the tubular bar 42. A heddle I3 which may have fallen upon the teeth of the bars 4| and 42 due to the breakage of a warp thread, cannot prevent this movement, because the shape of the teeth 41 and 54 is such that no locking of the bars 4| and 42 can take place when the bar 4| is moved in that direction.

The heddles I3 are illustrated on a larger scale in Figures 10 to 12 of the drawings. Each of the heddles I3 comprises an upper eye I 3a., through which the serrated bars 4| and 42 are passed, a lower eye I31; through which passes the wire 36, and an intermediate eye I30 carrying a warp thread I8.

The heddles I3 are reciprocated along with their frame I9. However, due to the elongated form of the eyes I3a and I32), there is a relative movement of the heddles I3 in relation to their frame I9 in the course of the up and down movement of the latter. The position of a heddle I3 relatively to the bars 4| and 42 and the wire 39 at the lower shed is illustrated in Figure 11. In that position the wire 36 is situated in the lower end of the eye I3b while the bars 4| and 42 extend approximately through the lower part of the eye I 3a.

Should the warp thread I8 break at that time, the heddle I3 will fall upon the serrated bars 4| and 42. This is illustrated in Figure 12 of the drawings.

The bar 4|, when moved in the arrow 85, will press with its end 5| against the bent lever 59, causing the lever to assume the position shown by broken lines in Figure 2,

As soon as the cam surface "I2 is moved out of contact with the roller IS, the pressure of the plate 99 against the end 58 of the bar 4| ceases so that the bar 45 has the tendency to move back into its original position under the influence of the spring 63 which presses against the angular lever 59. If, however, a fallen heddle I3 happens to lie upon the teeth 47 and 54 of the bars 4| and 42, the

direction of the position in the direction of the arrow return movement of the bar 4| in a direction opposite to that of the arrow 85 can take place only until the fallen heddle is clamped between the surfaces 49 and 55 of two adjacent teeth 41 and 54. As soon as the fallen heddle I3 is permanently clamped between these teeth, any further return movement of the bar 4| is prevented.

As has been mentioned, already, the lengthwise movement of the serrated bar 4| takes place when the frame I9 is in its lower position. The frame I9 is moved vertically upward from that 85 (Fig. 2) by the treadles I 2.

As shown in Figure 2, a lever 8! is situated ad- J'acent the bracket 23 of the frames I9 and is rotatably mounted upon a pivot 88 carried by the support 89. The position of the lever 81 in-relation to that of the frames I9 should be such that the lever 87 cannot be actuated by the ends of the frames. The support 99 is provided with a vertical slot 99 and is held in position upon the bracket 25 by a bolt 9| which passes through the vertical slot 99 of the support 89 and the horizontal slot 21 of the bracket 25. Due to this arrangement, the position of the'support 39 the reciprocating frames I9 may be adjusted both in the vertical and horizontal directions.

The lever 8'1 is provided with an ear 92 which is firmly connected with an end of an armored cable 93 situated within a sheath 94, the upper end of which is carried by a support 95, constituting an integral part of the support 89.

The knock-out mechanism is illustrated in Figure 2, and on a larger scale in Figures 3 and 9 of the drawings. This mechanism may be operated automatically by the cable 93.

The end of the sheath 94 which is nearest the knock-out mechanism is firmly held by a clamp 95 (Figs. 3 and 9). The clamp 99 is attached by the bolts 91 to a support I97 constituting an integral part of a bracket 98 which is riveted upon the stop spring 99.

As shown in Figure 2, the stop spring 99 is of standard construction and carries a rod 99a operating a clutch (not shown) which is connected with the mechanism driving the loom. In the operative position shown in the drawings, the member 99 is held in a recess against the influence of its spring which is bent in that position. In order to stop the loom the stop spring 99 is moved out of its recess either manually or by the automatically operable device described hereinafter. Then the member 99 will swing under the influence of its spring and the rod 99a will disengage the clutch, thereby stopping the loom.

The end I99 of the cable 93 is firmly connected with a slide I9I carrying a bolt I92 which presses against the end portion I99 of the cable 93 (Figs. 3 and 9). The locking pin I93 is slidably mounted in a guide I95 which constitutes an integral part of the bracket 98.

The support I91 part of the bracket which constitutes an integral 98 is provided with an opening through which passes the lower end of the locking pin I 93. A coil spring I99 surrounds the pin I03. The lower end of the spring I 98 presses against the upper surface of the support I01, while the upper end of the spring I99 presses against the slide I III which is slidable along the bracket 99 and which is firmly connected with the locking pin E03 by means of the bolt I94. Due to this arrangement the spring 98 presses the pin I09 against the cam surface I99 of a bracket II9.

The bracket I I9 is provided with two bore holes situated one above the other and extending at relatively to 4 right angles one to the other. A shaft III is situated in the upper bore hole of the bracket H0. The bracket H0 is suspended from the shaft III and may swing around said shaft. The frictional engagement between the shaft III and the adjacent walls of the bracket IIO may be adjusted by means of bolts II2 which are screwed into threaded openings formed in the bracket I I0 and which press against the shaft III.

The lower bore hole of the bracket III! carries the knock-01f pin I I3 which is firmly held in the bracket IIO by means of the bolts I00. The end II4 of the knock-off pin II3 carries a weight II5 whichis attached to the knock-01f pin I I3 by the pin H6. The opposite end II1 of the pin H3 is free and in the operative position of the device which is shown in full lines in Figure 3, is situated underneath the lay II8 which is carried by the lay sword I I9.

The knock-out mechanism is operated as follows:-

When one of the frames I9 is moved upwardly in the direction of the arrow 86 by the treadles I2, its angular lever 59 passes alongside the lever 81, provided the lever 59 is situated in the position shown by full lines in Figure 2. If, however, a heddle I3 is clamped between the teeth 41 and 54 of the bars 4| and 42, the bar 4I will be prevented from returning to the position shown in full lines in Figure 2, with the result that the angular lever 59 will be maintained by the bar 4| in its displaced position shown by broken lines in Figure 2. 'If the lever 59 is maintained in this deviated position, it will strike an end of the lever 81 in the course of the upward movement of the frame I8, thereby swinging the lever 81 upwardly around its pivot 88. The lever 81 will pull the cable 93 in the course of this swinging movement.

As shown more clearly in Figure 3 of the drawings, the cable 93 is firmly connected with the sliding member IOI which in its turn is firmly connected with the locking pin I03. The movement of the cable 93 in the direction of the arrow shown in Figure 2 will cause a movement of the sliding member IOI in the direction of the arrow I20 shown in Figure 3. The slide I0 I when moving in this direction, will compress the coil spring I08 and will pull the end I2I of the locking pin I03 out of engagement with the abutment I22 provided in the cam surface I09 of the swinging bracket IIO.

As soon as the bracket H0 is freed, the weight I I5 will swing the bracket I I0 around its pivot l I I until the knock-off pin II3 assumes the position shownbybrokenlinesin Figure 3. In this position the knock-off pin H3 is situated within the path of movement of the thrust plate I23 carried by the lay H8. The lay IIO in the course of its next movement toward the stop spring 09 will cause the thrust plate I23 to strike against the end portion II1 of the knock-off pin H3. The stop spring 99 will leave its recess under the force of the blow imparted by the plate I23 and will move to its inoperative position, causing the member 99a to disengage the main clutch, thereby stopping the loom.

If, while the loom is at a standstill, it is desired to string up a harness or to remove some heddles, the projecting end 58 of the serrated bar 4| is rotated manually through an angle of No tools are required for this purpose, since the end 58 of the bar 4| may be conveniently grasped by the hand of the operator. By rotating the bar 4| through an angle of 180. the bar 4| is moved from the position shown in Figure 4 to the position shown in Figure '1.

It will be noted that no screws or similar connecting means are to be loosened and tightened up again for this operation. Furthermore, the fiat springs 65 will prevent the bar 4| from being unintentionally rotated further than through an angle of 180.

As shown in Figures 7 and 8, in the inoperative position the teeth 54 of the bar 4| are covered by the adjacent portions of the tubular bar 42, while the smooth, round surfaces of the bar 4| project beyond the teeth 41 of the bar 42.

Instead of turning the serrated bar 4 I, the same result may be attained by rotating the serrated tubular bar 42 through an angle of 180. This rotation may be carried out by pressing the upper end of the spring support 32 against the bracket 23 of the frame I9 until the projections 43 are released out of the recesses 44 of the member 31, moving the bar 42 toward the bracket 23 and then turning it by hand. Since the two projections 43 co-operating with the corresponding recesses 44 are situated diametrically opposite each other, the projections 43 will snap into the recesses 44 after the tubular bar 42 has been rotated through an angle of 180, thereby preventing further unintentional rotation of the bar 42.

If it is desired to remove heddles I3 or to insert them on the right side of the frame I9 (looking in the direction of Figure 2) the serrated bar 4| or the serrated tubular bar 42 is turned through an angle of 180 and then the bar M is liberated from its gripping contact with the two fiat springs 05. Then the bar 4| is moved toward the left until the serrated tubular bar 42 can be liberated by pressing back the spring support 32, thereby enabling an insertion or removal of the heddles.

If the same operation must be carried out on the left side of the frame (looking in the direction of Figure 1), the serrated tubular bar 42 or the serrated bar 4| is rotated in a similar manner and then the bar 4| is drawn to the left until the angular lever 59 can be slightly turned about its pivot 60, whereupon the bar 4| is drawn so far to the right that the serrated tubular bar 42 can be removed from the spring support 34. As soon as this has been accomplished, heddles can be conveniently inserted into or removed from the left side of the frame.

The device illustrated in the drawings comprises a frame I30 provided with a cross beam |3| and a vertical support I32. The frame I30 is substantially similar in form to the Figures 13 and 14 of frame I0 (Figure 2), only a part of the frame I30 being illustrated in Figure 13. The frame I30 carries a pair of supporting springs I33, each of which carries a separate tubular holding member I34. Only one of the two springs I33 is illustrated in Figure 13.

The members I34 are in contact with a tubular serrated bar I35 which is provided with teeth I36. A serrated bar I31 which is situated within the tubular bar I35 is provided with teeth I38.

The frame I30 carries a bail I39 which is movable in the direction of the arrow I51 and which is firmly connected with a pin I40 carried by a support I4I attached to the beam I3I. The pin I40 is movable in the direction of its longitudinal axis along with the bail I39.

The slidable bail I39 is held in position by the pin I40 and by the end portion I42 of the serrated bar I31. This end portion I42 is mounted in a bore hole I43 provided in the bail I39.

A pawl I44 surrounded bv a coil spring I45 comprises an end portion I l? and is situated in a vertical bore hole I46 formed in the bail I39. The lower portion Iii of the pawl I44 is of larger diameter than the pawl I 54. The portion I i? fits into a suitable recess M5 formed in the bail I 39 and is adapted to project into one of the two recesses I 39 formed in the end portion M2 of the serrated bar I37. As shown in Figure 13, the two recesses 549 are situated diametrically opposite each other.

The pin MEI comprises a threaded portion I53 and carries nuts I5I. A coil spring I5 surrounds the pin I40. One end of the spring I i? presses against the nuts I5I carried by the pin. I48, while the other end or the spring l5 I presses against the bracket I32.

The pin I40 with its support is situated a recess I55 formed in the beam HI and. is covered by a plate I56.

The device is operated as follows:-

The serrated bar I3! is moved in the direction of the arrow I5'I by a device which is not shown in the drawings and which may be the same as the pendulum lever I5 and the cam "Iii shown in Figure 2. I

The bar I3'I will push the bail I39 outwardly in the direction of the arrow I57, thereby compressing the coil spring IE -l surrounding the pin Me. As soon as-the cam surface Iii (Figure 2) will release its pressure against the serrated bar 537, the spring I54 will expand and tend to move the bail I39 back into the position shown in full lines in Figure 13. If a heddle is dropped between a pair of adjacent teeth I36 and I it will lock the bar I31 in its right-hand position (looking in the direction of Fig. 13), so that the spring I5 1 will remain compressed and the bail I39 will not return to the bracket I32. In the course of the upward movement of the frame I30 caused by the treadles I 2 (Fig. 1) or any other suitable means, the member I39 will strike against a lever which is not shown in the drawings and which may be the lever 81 shown in Figure 2, thereby operating the knock-out mechanism of the type described in connection with the device shown in Figures 1. to 12 of the drawings.

The bar I35 is of oval shape, as illustrated in Figure 14. Obviously, both the inner and outer bars may be of any other suitable shape.

It is apparent that in the devices constructed in accordance with the present invention, the serrated bars continue their upward movement along with their frame, even if a warp has been broken and a heddle has been allowed to fall upon the serrations of the bars until this upward movement has been practically completed. Only the friction of the inner serrated bar need be overcome in order that it may carry out its return movement in the direction of its longitudinal axis, so that the springs causing this return movement may be made comparatively weak.

A dropped heddle clamped between the serrations of the two bars is not subjected to any force other than that of the springs which always have their uniform low tension independently of the number of shafts, so that the heddles are not subjected to any considerable stress by the device.

The cam III which along with the pendulum lever I5 causes the lengthwise movement of the inner bar, is positively connected with its drive, so that it is actuated without the use of any easily breakable and unreliable elements.

A further advantage of the present invention is the arrangement of the serrated bars in such manner that they can be turned relatively to each other about a common longitudinal axis. It is thus possible to turn the bars in such manner that the heddles rest upon a smooth surface, and consequently, can be conveniently pushed backward or forward and/or removed or replaced by new ones. On the other hand, the bars are mounted in such manner that they are firmly clamped after having been rotated through an angle of so that they will always assume their correct positions and will not rotate of their own accord. Both the outer and the inner bars can be easily removed and replaced by new ones.

Figure 15 shows a portion of a cotton loom, or the like, provided with a stationary frame I60. An inner serrated bar I6! which is provided with teeth I82 is movably mounted in the frame I69. The bar IGI is surrounded by a tubular serrated bar I63 which is carried by the supports I64 and IE5 attached to the frame I 60. The inner bar iIiI is reciprocated in the direction of its longitudinal axis by a two-armed lever I66 which is pivoted at I61 and which carries a roller I68 pressed against a cam I69 by a spring III]. A cable Ill attached to a knock-out mechanism (not shown) is connected to a lever I12 carried by a support I'I3 which is moved up and down along guides IN by a rod I15 driven by a disc I76 which is keyed upon the shaft Ill carrying the cam I69. Drop wires I18 are situated over the serrated bars IBI and I 63. While the loom is being operated, the lever I72 is situated in the position shown by broken lines in Figure 15, and is moved up and down by the support I73 without striking the serrated bar I6I which is reciprocated in the direction of its longitudinal axis by the lever I66. 'If awarpthread I8 breaks, a drop wire I18 falls upon the bars IiiI'and I63 and is clamped between a tooth I62 of the inner bar IEI and a tooth I19 of the outer bar I63 during the return movement of the bar IiSI in the direction of the arrow I86. Then the bar I6! is locked, so that it comes in contact with the lever I72 during the next upward movement of the latter and moves the lever from the position shown by broken lines in Figure 15 to the position shown in full lines in that figure, thereby pulling the cable III and stopping the loom.

Figure 16 shows the position of the drop wire I78 while the loom is in operation. Figure 17 shows a drop wire I'I8 clamped between the serrated bars after the breakage of the thread. Figure 18 shows the serrated bars after the outer bar I63 has been rotated to an inoperative position.

The provision of a flexible cable 93 or I 'II actuated by the motion of the warp stop frame or the support I13 and actuating the knock-out mechanism assures a smooth operation of the entire device. A flexible cable is to be preferred to connecting rods, since it occupies little space and is much more reliable in operation. I

Numerous changes may be made in the described constructions without departing from the scope and spirit of the present invention.

What is claimed is:

1. In a mechanical warp stop motion for looms, the combination with a heddle frame provided with a series of heddles, a bar which is circular in cross-section and which comprises teeth formed upon one of the surfaces thereof, another bar carrying the first-mentioned bar and having a portion which is U-shaped in cross-section and which is provided with teeth adapted to be situated adjacent the teeth of the first-mentioned bar in the operative position of said bars, each of the teeth of the two bars having an oblique surface and a substantially vertical surface, the vertical surface of a tooth of one bar facing oppositely to the vertical surface of an adjacent tooth of the other bar, one of said bars being rotatable relatively to the other bar about its longitudinal axis, whereby a smooth surface is presented to a heddle falling upon said bars if the rotatable bar is moved from its operative position, one of said bars being reciprocable in the direction of its longitudinal axis relatively to the other bar, the vertical surfaces of the teeth of the two bars being adapted to clamp a fallen heddle situated between them in the course of said relative movement when said. bars are in the operative position, whereby the two bars are locked, means supporting said bars, means for reciprocating the first-mentioned means, and a knock-out mechanism comprising means actuated by said bars while they are locked.

2. In a mechanical warp stop motion, a frame provided with a series of heddles, a pair of yieldable supports carried by said frame on opposite sides thereof, a tubular bar having serrations formed therein, means carried by said yieldable supports for carrying said tubular bar and for preventing the rotation of said tubular bar, another serrated bar situated within the firstmentioned serrated bar, and freely rotatable therein about a longitudinal axis common to the two bars, the serrations of one bar having substantially vertical surfaces situated oppositely to the Vertical surfaces of the serrations of the other bar in a predetermined relative angular position of said bars, one of said bars being reciprocable relatively to the other bar in the direction of said longitudinal axis, said serrations clamping a heddle falling between said serrations in the course of said reciprocal movement, whereby the two bars are locked, means for reciprocating said frame, and a knock-out mechanism comprising means actuated by said bars while they are locked.

3. In a mechanical warp stop motion, a frame provided with a series of heddles, a pair of yieldable supports carried by said frame on opposite sides thereof, a serrated bar, members carried by said yieldable supports and clamping said bar, said members engaging said bar to prevent rotation thereof, said members being adapted to be removed out of contact with said bar to enable a rotation or withdrawal of said bar, another serrated bar situated within the first-mentioned serrated bar and freely rotatable therein about a longitudinal axis common to the two bars, the serrations of one of said bars having substantially vertical surfaces situated oppositely to the vertical surfaces of the serrations of the other bar in a predetermined relative angular position of said bars, one of said bars being reciprocable relatively to the other bar in the direction of said longitudinal axis, said serrations clamping a heddle falling between said serrations in the course of said reciprocal movement, whereby the two bars are locked, means for reciprocating said frame, and a knock-out mechanism comprising means actuated by said bars while they are locked.

4. In a mechanical warp stop motion for looms, the combination with a heddle frame provided with a series of heddles, a serrated bar, another serrated bar movable relatively to the first-mentioned serrated bar, the serrations of one of said bars having vertical surfaces situated oppositely to the vertical surfaces of the serrations of the other bar, a cam, means for rotating said cam, a

pendulum lever, means carried by said pendulum lever and engaging a surface of said cam to oscillate said lever, means carried by said pendulum lever and engaging the movable serrated bar while said lever is oscillated to move the bar, whereby the vertical surfaces of the serrations of the two bars are moved away from each other, so that no clamping of a heddle falling upon the serrations can take place, means engaging an opposite end of the movable serrated bar to return the bar to its original position after it has been moved by the third-mentioned means, whereby the vertical surfaces of the serrations are moved toward each other, so that a fallen heddle is clamped between two vertical surfaces in the course of said return movement, a frame carrying the two serrated bars, means for reciprocating said frame from a lower shed position to an upper shed position, and vice versa, and a knock-out mechanism comprising means actuated by said serrated bars while they are locked, the third-mentioned means striking the end of the serrated bar while said frame is in the lower shed position.

5. In a mechanical warp stop motion for looms, the combination with a heddle frame provided with a series of heddles, a serrated bar, another serrated bar movable relatively to the first-mentioned serrated bar, the serrations of one of said bars having vertical surfaces situated oppositely to the vertical surfaces of the serrations of the other bar, a cam, means for rotating said cam, a pendulum lever, means carried by said pendulum lever and engaging a surface of said cam to oscillate said lever, means carried by said pendulum lever and engaging the movable serrated bar while said lever is oscillated to move the bar, whereby the vertical surfaces of the serrations of the two bars are moved away from each other, so that no clamping of a heddle falling upon the serrations can take place, means engaging an opposite end of the movable serrated bar to return the bar to its original position after it has been moved by the third-mentioned means, whereby the vertical surfaces of the serrations are moved toward each other, so that a fallen heddle is clamped between two vertical surfaces in the course of said return movement, a frame carrying the two serrated bars, means reciprocating said frame by moving the same vertically from a lower shed position to an upper shed position and vice versa, and a knock-out mechanism comprising means actuated by said serrated bars while they are locked, the last-mentioned means being actuated by the locked serrated bars when the frame is substantially in the upper shed position.

6. In a mechanical warp stop motion for looms, the combination with a heddle frame provided with a series of heddles, a partly tubular bar having an oval cross-section and having serrations formed therein, another serrated bar situated within the first-mentioned bar and having a circular cross-section, the second-mentioned bar being rotatably mounted in the first-mentioned bar, one of said bars being movable longitudinally in relation to the other bar, the serrations of one of said bars having vertical surfaces situated oppositely to the vertical surfaces of the serrations of the other bar, whereby the two bars are locked when a heddle is placed between the serrations of the two bars in the course of the longitudinal reciprocatory movement of the movable bar relative to the other bar, means for reciprocating longitudinally the movable bar relatively to the other bar, and a knock-out mechanism comprising means actuated by said bars while they are locked.

7. In a mechanical warp stop motion in looms, the combination with a heddle frame provided with a series of heddles, a serrated bar, another serrated bar carried by the first-mentioned bar and movable relatively thereto in the direction of its longitudinal axis, means carried by said frame and carrying the first-mentioned serrated bar, the serrations of one of said bars having substantially vertical surfaces situated oppositely to the vertical surfaces of the serrations of the other bar, means for moving the second-mentioned bar relatively to the first-mentioned bar in a predetermined direction which is parallel to the direction of the longitudinal axis of the second-mentioned bar, a bail movable along with the second-mentioned bar when the latter is moved in said predetermined direction, a pin firmly connected with said bail and slidably mounted in said frame, a spring surrounding said pin and pressing against said frame for causing said pin, said bail and the second-mentioned bar to move in a direction opposite to said predetermined direction after the second-mentioned bar has completed its motion in said predetermined direction, said serrations clamping a heddle falling upon them in the course of the movement of the second-mentioned bar in the direction opposite to said predetermined direction, whereby said bars are locked, means for reciprocating said frame, and a knockout mechanism comprising a lever which is out of contact with said bail while said bars are not locked, and which is operatively actuated by said bail while the bars are locked.

8. In a warp stop motion for looms, the combination with a heddle frame provided with a series of heddles, a pair of relatively counter toothed bars, one reciprocable within the other and freely rotatable within the confines of the same about a common longitudinal axis, pushing means contacting one of said bars for causing a relative reciprocation of said bars and flexible means contacting the opposing end of one of said bars to cause said bars to return to their original position, said bars and said teeth being so arranged and spaced that a fallen heddle will ride over said teeth during the pushing operation and be clamped between said teeth during the return movement, whereby said bars will be interlocked and means controlled by said interlocking operation for stopping the operation of the loom.

THEODOR CURT WAGNER.

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