US1889500A

US1889500A - Loom

Info

Publication number: US1889500A
Application number: US424995A
Authority: US
Inventors: Schmidt Paul
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-03-27
Filing date: 1930-01-31
Publication date: 1932-11-29
Anticipated expiration: 1949-11-29

Description

Nov. 29, 1932.

P. SCHMIDT 1,889500 LOOM Filed Jan. 31. 1950 s Sheets-Sheet 1 Fig.1

5 II T n 5 WI! I I Inventor: B h m [J15 I Nov. 29, 1932. P. SCHMIDT 1,889,500

' LOOM I I Filed Jan. 51. 1930 5 Sheets-Sheet 2 Nov. 29, 1932. P. SCHMIDT 1,839,500

I LOOM 7 Filed Jan. 31, 1950 5 Sheets-Sheet 3 /n venfan' P. SCHMIDT New. 29, 1932.

LOOM

p m, m n% e V l m fl Q M f A. m w: m 2 M x I .9 I m Lin 2 w W 7 ma Nov. 29, 1932. P. SCHMIDT 1,889,500

LOOM Filed Jan. 51. 1950 5 Sheets-Sheet 5 /n venfor:

Patented Nov. 29, 1932 'UNITED. STATES PAUL SCHMIDT, OF SORAU' GERMANY LOOM Application filed January a1, 1930, Serial No. 424,995, and in Germany March 2?, 1929.

This invention relates to a shuttle chang-' ing device capable of being used for overpick or underpick looms, in which the full shuttle is introduced .on one side and the 5 empty shuttle is ejected on the otherside. The invention comprises more particularly means for enabling shuttles of any kind and size to be used and for eliminating any damage to the shuttles and parts of the loom, 10 means for preventing the occurrence of faults in the weaving and in the pattern when the shuttles are being changed and automatic means for cutting off theend of the thread of the weft bobbin in the newly introduced shuttle.

According to the invention these means and the device for controlling them from the crank shaft are so constituted that they can a be applied to existing looms without any modification.

The accompanying drawings show dia-' grammatically a constructional form of the invention as applied to .an overpick loom with a right-hand drive.

Fig. 1 is a front elevation of the loom, viewed in the direction of the arrows I-I of Figs. 2 and 3, v

Fig. 2 is a plan view,

" Fig. 3 a side elevation viewed in the direction of the arrows IIIIII of Fig. 1.

Fig. 4 shows the various parts of the device with the front wall of the shuttle box raised, but corresponds for the rest to Fig. '3, Fig. 5 is a section on line 55 of- Fig. 3,

Fig. 6 shows the shuttle magazine and the parts belonging to it, in plan view,

Fig. 7 the same in side elevation viewed in the direction of the arrows VIIVII of Fig. 6, Fig. 8 is a vertical section through the shuttle magazine on line VIII-VIII of Fig. 6,

Fig. 9 a vertical section on line 99" of Fig. 1 (shuttle ejecting side),

Fig. 9a shows the upper partof the vertical section of Fig. 9 to an enlarged scale,

Fig. 10 shows the cutting off device and the means for locking and unlocking it,

r Fig. 11 is a vertical section on line X I XI in Fig. 10, 1

' Fig-12 is a horizontal sect on on line XII-XII of Fig. 10,

Fig. 13 shows the means for displacing the shuttle box swell, r

Fig. l t-the same means in vertical section on line XIVXIV of Fig. 13 and I Fig. '15 the means for disengaging the taking-up motion and the means for reversing the direction of rotation of the card cylinder.

The hereinafter described shuttle changing device is shown as applied to a loom with right-hand drive, that is to say to a loom in which the spent shuttle is ejected from the left-hand shuttle box and the full shuttle is introduced into the right-hand shuttle box. For the sake of clearness all parts which are not essential for understanding the invention, but which are well known'inlooms of the kind in question, such as shafts,treadles, picking tappets and the like, are omitted from the figures.

The lay 0 which is pivoted at the bottom of the frame at m has the requisiteforward and backward rocking motion imparted to it by the crankshaft 9. Below the crank shaft 9 is journalled the lower shaft (tappet shaft) 41a, which is driven by the toothed wheels 1', 8 (Figs. 1, 3, 4) andon which are mounted the picking tappets, not shown. In the lower part of theframeand at right angles to the crank shaft9 and the tappet shaft 41a is ournalled a controlling shaft 6 (Figs. 1, 3, 4, 7, 13, 14, 15) which can be caused to rock through about a quarter of a revolution by means of a crank arm n which is keyed on it 35 and is capable of rocking upwards. For this purpose the crank arm n is linked to a rod 5 which is acted on by a two-armed lever 4; pivoted on the pin 4 on the loom frame. The two-armed lever 4 has motion imparted to it by the weft fork arm 3 which is pivoted at 3' (Fig. 6) and which is linked by the connecting rod 1 to the weft fork 1. When the loom isin normal operation, the hook of the weft fork l'is swung upwards by the weft thread a a (Fig.7) at each forward swing of the lay 0' in a known manner and thereby prevented from engaging in the so-called weft hammer 2. Should the weft thread break, however, or should the weft bobbin be spent, the weft 109 fork 1 engages in the weft hammer 2. This weft hammer 2 is mounted on the upper end of a two-armed lever 42 which is controlled by a tappet 41 mounted for instance on the tappet shaft 41a (Figs. 1 and 3). Hence, on the weft fork 1 engaging in the weft hammer 2 through the weft thread breaking or coming to an end, it is carried along by the weft hammer through the rocking motion of the lever 42 and transmits its motion through the

parts

1, 3, 4, 5, n to the controlling shaft 6. On the controlling shaft 6 is a tappet 8a which when rocked by the crank arm n acts on a member 8?). The member 8?) is in fixed I relation to an arm 11 and the arm 11 is fixed to a'lever 11 pivoted so as to swing vertically about a pin 72 on the frame of the loom. The free end of the arm 11 bears a roller 8, while the other end is pivoted by a pin 73 to the lever 11 so that the arm 11 is capable of swinging horizontally. A strong spring d always seeks to draw the arm 11 upwards.

On the toothed wheel 7* is a cam 10 with two swells h, 2". This cam acts on the roller 8 when brought into engagement by the arm 11. The controlling shaft 6 is locked in the position in which the roller 8 is in engagement by a locking member 7 fixed on the controlling shaft 6, with which a spring-loaded '2 detent 7' engages at the correct moment.

This detent 7 is disengaged by the lay 0, when the latter strikes during its forward motion against the upper end of the detent. The unlocked controlling shaft 6 then swings back under the action of a weight (not shown in the drawings) into its original position.

The front wall 15 (Figs.1,2,3, f) of the two shuttle boxes is actuated during the shuttle changing operation by the cam 10 acting on the roller 8. The following means are provided for this purpose:

Parallel to the tappet shaft 41a in the lower part of the loom frame a shaft 13a is journalled. On this shaft is a lever 13 which is pivotally connected by a bar 12 to the lever 11. The shaft 13a also carries arms 13b to which are pivotally attached the rods 14 (Figs. 1 and 3) for raising the front walls 15 of the shuttle boxes. On the shaft 130, is also an arm 130 which acts on a rod 17, the upper end of which has a head piece in which is a helical slot 17a. In this slot there engages a pin connected to the cross arm 18 for securing the picker 18a, which pin during the upward motion of the rod 17 slides in the helical slot 17a, thereby rocking the cross arm 18 so as to secure the picker. The picker securing means are returned into the original position by a spring The rods 1% are moved in such a manner that they lift the front walls 15 of the shuttle boxes upwards at an inclination to the vertical, that is slightly forwards. The result of this is that immediately at the commencement of the lifting motion the shuttle boxes become wider in the transverse direction, releasing the spent shuttle without changing its position and that on the front walls 15 of the shuttle boxes dropping suddenly in two stages owing to the abrupt descent of the swells h,i on the cam 1(),the freshly inserted shuttle will not be damaged but will be correctly held fast even if it is considerably wider than the average shuttle.

The rods 14 which raise the front walls of the shuttle boxes and allow them to drop suddenly slide in

guides

74, 75 which are fixed to the lay beam 23 (Figs. 2 and Of these guides the guide 7 4 is mounted so as to swing about a hinge 76 in the manner of a fiap and can yield slightly in opposition to a spring 77. Owing to this arrangement the front walls of the shuttle boxes can also yield slightly which enables shuttles of different kinds and of different width to be used. On the front of the loom to the right is mounted the shuttle magazine 28 which contains the full shuttles to be inserted. Of the shuttles 16 placed one on the other in this magazine, the lowest shuttle rests on a slide 27 which is moved by a bar 26 first towards the lay beam 23 and is then, after the full shuttle has been inserted into the shuttle box, moved back again. The bar 26 is driven forwards by the lay 0. For this purpose the bar 26 is in pivotal engagement with a two-armed lever 25 which is pivoted on the pin 25 and is rocked by a bar 22 each time the free end 22' of the latter is swung upwards into the path of the spring-loaded stop 24 on the lay 0 4). This upward swinging motion of the bar 22 takes place on the controlling shaft 6 rotating and is produced by an arm 19 keyed on to the said shaft (Figs. 4 and 1). which by means of a bar 20 rocks a bell crank 21 pivoted on the frame of the loom, one arm of which engages under a push member 21a fixed-to the bar 22. In order that the shuttle 16 resting on the slide 27 shall not be obstructed by the shuttles lying above it when the slide is moved forward, there is fitted to the upper end of the above-mentioned twoarnied lever 4 which is acted on by the weft hammer 2 a bar 29 which acts on a two-armed lever 31 which causes a shaft 30 journallcd on the shuttle magazine to rock in opposition to the action of a spring On the shaft 30 are mounted so as to coact with the shaft 30 fingers 32 (Figs. 6, 7) which at the commencement of the shuttle changing operation engage under the pointed ends of the lowest shuttle but one and slightly raise the shuttles lying on it. For locking the shaft 30 in the position in which the pile of shuttles is raised a finger 34 is fixed on the shaft 30 (Figs. 6 and 8) which engages under a spring-loaded detent 35 pivoted on the pin 357). On the. fingers 32 are provided bent wire arms which normally, that is to say when the pile of shuttles is not raised, engage in front of the bottom shuttle (Fig. 3) and prevent this shuttle slipping away owing to the vibration of the loom. v

The spent shuttle is ejected from the left hand shuttle'box by pins 47 (Fig. 9) which extend with sufficient play through the shuttle box swell 7 8, as shown to an enlarged scale in Fig. 9a. The pins 47 are mounted on twoarmed levers 46 which are controlled by a bar 44 pivoted to one of the rocking arms 13?). The upper end of this bar which slides in a yielding guide is provided with a nose 45 which in its upward motion causes the levers 46 to rock. The pins 47 are returned into the inoperative position by the action of a spring. In order that at the moment in which the upward motion of the front wall 15 of the shuttle box commences the empty shuttle shall in no circumstances be moved by the front wall 15 of the shuttle box out of its position the spring-loaded swell 78 of the shuttle box is in operative relation with a device shown in Figs. 13 and'14 which causes the swell 7 8 to yield at this moment. This device consists of a two-armed lever 51 which is pivoted on a pin 52 on the-loom frame and the lower end of which is pivotally connected. through a bar with a cranked arm 49 fixed on the controlling shaft 6, while its upper end is provided with an inclined surface 53. To the swell 78 is pivoted a lever arm 7 9 which is mounted on a shaft 80 journalled onthe lay so as to be capable of rocking. The shaft 80 bears a lever 81 provided with a grooved roller 82. On the controlling shaft 6 and with it the two-armed lever 51 being. caused to rock the inclined surface 53 would move opposite the groove of the roller 82. During the forward motion of the lay the roller 82 will run up the inclined surface 53 causiin the arm 79 to swing back and the swell 78 of the shuttle box to yield. The front walls of the shuttle boxes drop very suddenly as already stated owing to the abrupt descent of the swells h, i on the cam 10, at first only by half the amount of their entire motion and thereupon during half the backward motion of the lay by the rest of their entire motion. This prevents the front wall of the shuttle box returning to its initial position before the fresh shuttle has been completely; inserted in the shuttle box.

For cutting off the end of the weft of the inserted shuttle a cutting device 40 is provided on the lay beam close to the front wall of the shuttle box so as to be capable of being raised and lowered. (Figs. 2, 11 and 10). This cutting device 40 is raised by the shaft 13a. A two-armed lever 70 pivoted below the lay beam iscaused by a spring to engage in a recess 70 in the cutting device, holding it up until the weft thread lies under the cutting edge. The two-armed lever 7 O iswith drawn from the recess is by an inclined surface 72 (Figs. 10' and 12) provided on the lever striking against a projection 71 on the lever 42 when'the lay beam swings back.

As-the loom runs idle for two picks during the change of shuttles theweft fork must during this period be held up by a'stop provided for this purpose in order that it shall not engage in the weftvhammer 2. This is effected by a member 84 fixed to the cutting device 40 which is indicated in Fig. 10 by broken lines. In the raised position of the cutting device 40, that is to say while no fresh weft thread has yet been entered, the member 84 lies opposite the weft fork so that the latter engaging through a grid provided in the lay beam strikes against the member 84, thus being prevented from engaging in the weft hammer 2.

From the controlling shaft 6 a further device shown diagrammatically in Fig. 15 is controlled, through the'operation of which faults in weaving are prevented. This device consists of a three-armed lever 56 mounted so as to rock on a shaft 60. One of the three arms is pivotally connected to the pawl 58 of the takingup motion 59, the second being connected to a cord 61 which acts on the operating mechanism 51 of the acquard or dobby cards, while the third is in pivotal connection'through a bar55 with an arm 62 fixed on the controlling shaft 6. On the controlling shaft 6 turning, the pawl 58 is lifted out of the ratchet wheel 59 and is kept raised during the shuttle changing operation, so that the taking up motion 59 will remain stationary and no thin or less dense places can be formed in the fabric. At the same time the cord 61 disengages the upper feed pawl 91 of the card'cylinder 90 and causes a pawl 92 on the under side to engage which turns the card cylinder in the opposite direction, thereby bringing back the cards which have been running idle so that no interlacing faults will result.

The shuttle changing device described above operates as follows:

On the weft thread a breaking or coming to an end, the hook-shaped end of the weft fork 1 engages with the weft hammer 2 (Fig. 7 and the latter carries the weft fork 1 along with it. The motion of the weft hammer 2 is brought about by the tappet 41 which causes the lever 42 to rock. The weft fork 1 carried along by the weft hammer 2 imparts motion to the arm 3 and the latter strikes against the two-armed lever 4 which pulls up the rod 5, thereby turning the control shaft 6 which at the end of its rotary motion is locked by the ovetent a engaging with the locking memher 7. The rotary motion of the controlling shaft 6 causes the roller 8 to swing under the action of the tappet 8a which strikes against the arm 8?) into the path of the cam 10. The cam 10 then acts on the system of levers and rods 1114 and the front walls 15 of the shuttle boxes are thereby raised for the purpose of introducing a full shuttle and ejecting a spent shuttle (Fig. 4). When being raised the front walls of the shuttle boxes are given a slight forward inclination in the manner already described in order that they shall not move the shuttles out of their position and shall not damage them w ien falling back. During the motion of the system of levers and rods l1-14 the rod 17 is also forced upwards, rocking the picker-securing device 18 in such a manner that it will hold the picker 18a fast during the insertion of the full shuttle. Through the rotation of the controlling shaft 6 the system of levers and rods 1921 (Figs. 1 and 3) is also put in motion and the bar 22 is thereby swung upwards into the range of action of the yielding stop 24 fixed to the lay beam 23, the stop 2% pushing the bar 22 forwards causing the lever 25 which is pivoted on the pin 24 to push the shuttle slide 27 forwards (Fig. 4) and the bottom shuttle 16 resting on the said slide to be delivered to the shuttle box. Shortly before the commencement of the forward motion of the shuttle slide 27 the pile of shuttles above the bottom shuttle is slightly raised by the finger 32 operated by the two-armed lever l, in which position it is held by the locking means 3 1, 35 during the whole period during which the slide is in motion. At the same time as the fingers 32 the supporting arms 83 are also raised to such an extent that during the forward motion of the slide 27 the bottom shuttle is prevented from moving out of the shuttle magazine. On the slide 27 returning into the inoperative position it strikes against the stop 35a of the detent 35 (Fig. 8), thereby unlocking the fingers 32. The pile of shuttles which has up to that moment been held aloft then descends on to the supporting slide 27 and the supporting arms 38 again engage above the bottom shuttle 16.

The removal of the spent shuttle at the left hand side of the loom is effected as follows:

On the front wall 15 of the shuttle box rising the bar 44- (F ig. 9) also moves upwards. The nose 45 strikes against the two-armed lever 46 causing the two levers A6 to rock and by means of the pins 47 which extend through the swell 1'8 (Fig. 9a) toeject the shuttle 16 out of the shuttle box. As the guide sleeve of the rod 4-4- is mounted so as to be capable of yielding there is no danger of the parts fracturing in the case of any disturbance. Shortly before the front wall 15 of the shuttle box commences to rise the swell 78 is moved slightly backwards in the manner already tion is not advanced so that no faults are caused in the woven fabric through the loom continuing to run without a weft. Similarly the occurrence of interlacing faults is prevented owing to the reversal of the card cylinder 50 as described above.

After the introduction of the shuttle with the full bobbin and the insertion of the first welt the end of the weft thread is cut off by the cutting edge of the cutting device on the lever moving out of the recess 76 through striking the stop 71 of the lever l2 whereby the cutting device is unlocked. The fact that the described shuttle exchanging device is put in operation by means lying between the loom wall and the crank shaft gear wheel enables the novel device to be applied without modification to existing looms as at this particular place there is always available space. Should in any particular instance the loom brake occupy this position it can be dismantled as any loom brake is entirely superfluous when using the novel shuttle-exchanging device.

What I claim is:

1. A shuttle changing device for over-pick and under-pick looms in which the full shuttle is introduced on one side of the lay and at the same time the empty shuttle is ejected 0n the other side, comprising a crank shaft, shuttle boxes, movable front walls for the shuttle boxes, and a rotatable member driven by the crank shaft and adapt-ed to move the front walls of the shuttle boxes upwards and forwards at an inclination to the vertical and then to lower them, the lowering taking place in two successive stages.

2. A shuttle changing device for over-pick and under-pick looms in which the full shuttle is introduced on one side of the lay and at the salne time the empty shuttle is ejected on the other side, comprising a lay, shuttle boxes, movable front walls for the shuttle boxes, lifting rods for raising the front walls of the shuttle boxes, guiding means for the lifting rods, and hinges yieldingly supporting the guiding means at the ends of the front walls of the shuttle boxes corresponding to the ends of the lay, the said hinges allowing the front walls to yield sufliciently to enable shuttles of different sizes to be used.

3. A shuttle changing device for over-pick and under-pick looms in which the full shuttle is introduced on one side of the lay and at the same time the empty shuttle is ejected on the other side, comprising shuttle boxes, shuttle box swells, movable front walls for the shuttle boxes, means adapted to move the front walls of the shuttle boxes upwards and forwards at an inclination to the vertical and then to lower them, the lowering taking place in two successive stages, means adapted to move the shuttle box swell, at the side at which the empty shuttles are ejected, slightly backward shortly before the commencement of the upward movement of the front walls of the shuttle boxes, and means for bringing the said shuttle box swell retracting means into the ready position upon breakage or failure of the weft thread.

4:. A shuttle changing device as claimed in claim 3, further comprising pins extending through the shuttle box swells and adapted to eject the empty shuttles, a bar adapted to push forward the said pins, and levers for actuating the said bar.

5. A shuttle changing device for over-pick and under-pick looms in which the full shuttle is introduced on one side of the lay and at the same time the empty shuttle is ejected on the other side, comprising a lay beam, a magazine for full shuttles, shuttle boxes, movable front walls for the shuttle boxes, means adapted'to move the front walls of the shuttle boxes upwards and forwards at an inclination to the vertical and then to lower them, the lowering taking place in two successive stages, a slide adapted to introduce a full shuttle from the magazine into one of the shuttle boxes, rodding adapted to drive the slide towards the shuttle box, a yielding stop member fixed to the lay beam, and a weft fork adapted upon failure or breakage of the weft thread to bring the said rodding into the path of the said stop member, so that the movement of the lay beam actuates the slide rodding.

6. A shuttle changing device as claimed in claim 5, further comprising a pair of pivoted fingers actuated by the weft fork upon failure or breakage of the weft thread to engage under the ends of the bottom shuttle but one in the magazine just before the commencement of the forward movement of the slide and to lift the said shuttle, and any shuttles located above it, so as to relieve the bottom shuttle of their weight, means such as a de tent for locking the pivoted fingers in their position of engagement with the shuttle, means for unlocking the pivoted fingers upon the return of the slide, and springs adapted to swing the pivoted fingers back when unlocked, thereby allowing the shuttles previously supported by the pivoted fingers to sink on to the slide. Y

7. A shuttle changing device as claimed in claim 5, further comprising a pair of pivoted fingers actuated by the weft fork upon failure or breakage of the weft thread to engage under the ends of the bottom shuttle but one in the magazine just before the commencement of the forward movement of the slide and to lift the said shuttle, and any shuttles located above it, so as to relieve the bottom shuttle of their weight, forwardly extending and downwardly bent supporting arms secured to the pivoted fingers and normally engaging over the bottom shuttle in the magazine to prevent it from being moved forward, the said supporting arms bemg 'tles off it.

adapted "to release the said bottom shuttle when the pivoted fingers lift the'other shut- 8. A shuttle changing device as claimed in claim v1, further comprising a jacquard cylinder, a ratchet-and-pawl taking-up1m0- tion, a weft fork, means actuated by the weft fork upon failure or breakage of the weft thread, for disengaging the pawl from the ratchet of the taking-up motion at the commencement of the shuttle changing operation and reversing thedlIQQtlOIllOf rotation of the jacquard cylinder to bring backothe cards that have run through idly.

9. A shuttle changing device forover pick tle is introduced on one side of the lay and movable front walls for the shuttle boxes',

andunder-pick looms inwhich the full shutmeans adapted to move the front walls of the shuttle boxes upwards and forwards at an inclination to the vertical and then to lower them, the lowering taking place in two successive stages, 'a weft beam, a cutting device mounted close to the front wall of the shuttle box into which full'shuttles are introduced for cutting off the end of the inserted weft thread at the weft beam, means forraising the cutting device at the commencement of the shuttle changing. operation, a spring loaded arm adapted to keep the cutting device in the raised position during the shuttle changing operation, and meansfor releasing the cutting device from the spring-loaded arm after the first weft has been inserted, when the weft lies under the cutting edge, so'that the cutting device drops and cuts off the endof the weft thread of the full shuttle bobbin. a a I t v 10. A shuttlechanging device as claimed in claimr'9, further comprising a weft fork, a weft'hammer, a stop member fixed on the cutting device, the said stop member extends ing behind the :.weft beam and bearing against the weft fork when afresh shuttle has been introduced and the weft thread from it has not yet been inserted, thereby causing the weft fork to swing and preventing it. from engaging in the weft hammer. 11. A. shuttle changing device foroverpick and under-pick looms in which the full shuttle is introduced on one side of the lay and at .the same time the empty shuttleiis ejected on the other side, comprising shuttle ed to eject the empty shuttles, means for actuating the ejecting pins, a rockably mounted shaft for driving the means" that actuate the front walls of the shuttle boxes, the picker-securing means and the ejecting pins, a crank shaft, a cam secured to the crank shaft, a roller capable of being brought into engagement with the cam, a pivoted arm carrying the roller, rodding through which a rocking motion is imparted to the rockably mounted shaft by the pivoted arm when the roller is brought into engagement with the cam, and means for bringing the roller into and out of engagement with the cam, the said means comprising a weft fork, a controlling shaft driven from the weft fork, and

' a tappet secured to the controlling shaft.

12. A shuttle changing device as claimed in claim 11, wherein the cam has two abruptly descending swells, the device further comprising a strong spring pressing the roller into contact with the cam, so as to cause the descent of the front walls of the shuttle boxes to take place suddenly in two well marked stages.

13. A shuttle changing device as claimed in claim 5, characterized by the feature that the means by which the weft fork brings the drive rodding of the slide into the path of the stop member comprise a controlling shaft, rodding adapted to transmit motion from the weft fork to the controlling shaft, a crank arm mounted on the controlling shaft, a rod pivoted to the crank arm, and a bell crank lever pivoted to the said rod.

14. A shuttle changing device for overpick and under-pick looms in which the full shuttle is introduced on one side of the lay and at the same time the empty shuttle is ejected on the other side, comprising shuttle boxes, movable front walls for the shuttle boxes, means adapted to move the front walls of the shuttle boxes upwards and forwards at an inclination to the vertical and then to lower them, the lowering taking place in two successive stages, a lay, a crank shaft adapted to impart a forward and backward rocking movement to the lay, a cam secured to the crank shaft, a roller capable of being brought into engagement with the cam, a a weft fork, a. controlling shaft driven from the weft fork, a tappet secured to the controlling shaft and adapted to bring the roller into and out of engagement with the cam, a locking member secured to the controlling shaft, and a spring-loaded detent adapted to engage in the locking member as soon as the tappet has brought the roller into engagement with the cam, the lay being adapted to lift the detent out of the locking position at a suitable moment during its forward movement. In testimony whereof I have aflixed my signature.

PAUL SCHMIDT.