Warp tying machine

Abstract

A warp tying machine comprises a machine body, old and new warp yarn gripping means projecting from the body for gripping old and new warp yarns in side by side positions, and lease rods positioned below the yarn gripping means and projecting from the machine body in the same direction for guiding the warp yarns in movement toward the machine body. Yarn drawing means movable along the lease rods are provided for drawing old and new warps along the lease rods toward the machine body to stand-by positions. A yarn drawing hook is mounted on the machine body and movable in a path of revolution around the machine body, such path including the stand-by positions. Yarn cutting means are provided on the body and include means movable around the warp yarns when they are in the stand-by positions for engaging the yarns and positive action cutting means for cutting the engaged yarns. Yarn tying means are provided on the body along the path of the yarn drawing hook for receiving the old and new warp yarns which have been cut and for tying them together. A yarn presence detecting means is provided for detecting the presence of the yarns in the stand-by positions and for blocking movement of the machine when a yarn is not detected in either position.

Description

BACKGROUND AND OBJECTS OF THE INVENTION

The present invention relates to a warp tying machine which automatically ties a new warp to an old warp during a weaving process so that a weaving operation can continue substantially uninterrupted.

So far all the work for typing both a newly supplied yarn to be tied to an old warp (hereinafter called the new warp) and the warp already being used in the weaving process (hereinafter called the old warp) has been manually performed. Therefore, it has been an extremely inefficient method.

The first object of the present invention is to provide a warp tying machine which automatically unites new and old warps.

The second object of the present invention is to provide a lease rod to separate one by one the new and the old warps from rows of the new and the old warps and also to provide a yarn picking brush to draw out both warps to a stand-by position.

The third object of the present invention is to provide a mechanism which detects whether the new and the old warps, respectively, have been drawn into the standby position in the path of rotation of a yarn drawing hook by means of a reliable feeler of a detecting device.

The fourth object of the present invention is to provide a mechanism which picks up the new and the old warps from the standby position in the path of rotation of the yarn drawing hook and delivers them to a tying device.

The fifth object of the present invention is to provide a yarn cutting device which cuts off the said new and old warps on the side of a slidable clip at the same time the yarn drawing hook catches and holds the new and the old warps.

The sixth object of the present invention is to provide a tying machine by which the new and the old warps drawn through the yarn drawing hook are delivered to a guide piece and the said new and old warps are united by the coordinating operation performed by the guide piece, a withdrawal hook, and a hook guide cylinder thereof.

The seventh object of the present invention is to provide a yarn end disposal device with a yarn end receiving box so that, simultaneously with the cutting of the yarn end drawn into the guide piece of the tying machine by the yarn drawing hook, the yarn end is neatly recovered by being pinched-off with upper and lower grip pawls within the said box.

BRIEF DESCRIPTION OF THE INVENTION

In the present invention, in order to automatically tie an end of new warp to an end of a warp being woven, a tying machine body is slidably mounted on rails on a loom or a bench by means of a control device and a slidable clip is provided for holding a row of new and an old warps, respectively, in parallel. said clip projects forwardly above and from the said machine body and lease rods and a yarn picking brush of the said body so as to draw out the new and the old warps one by one, respectively, from the end of the respective yarn rows held in parallel by the said slidable clip to a stand-by position in a path of rotation of a yarn drawing hook. A feeler for detecting whether each of the new and the old warps has reached the standby position and a detecting device for the yarn linked with the said feeler are arranged in the front of and above the direction of the advancement of the said body. In the interior of the body is provided a yarn drawing hook mounted on a disc so as to pick-off one by one the new and the old warps, respectively, from the stand-by position in the path of rotation of the yarn drawing hook. Simultaneously with the picking-off of the new and the old warps by the said yarn drawing hook, a yarn cutting device rotatably mounted in front of the slidable clip cuts off the excess length of warp yarns. The new and the old warps are delivered to a guide piece from the yarn drawing hook and to a tying device provided on one side of the machine for tying these warps by a withdrawal hook, a hook guide cylinder, and a guide piece. Immediately thereafter, the yarn ends of the tied warps which are delivered to the said tying device are cut by cutting blades, and then, yarn ends which are cut-off in this way are neatly received in a yarn end receiving box of a yarn end disposal device which is provided on one side of the machine.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 and 2 are a side elevation view of one side and an enlarged side elevation view of the opposite side, respectively, of the device according to the invention;

FIG. 3 is an enlarged perspective side view of a transmission mechanism which is slidably mounted on a rail;

FIG. 4 is a plan view on line A--A in FIG. 2 showing how to open and close a pressing plate;

FIGS. 5 and 6 are enlarged perspective views showing a slidable clip and how it is opened and closed;

FIG. 7 is an enlarged side view, partly cut away, of the tying machine of FIGS. 1 and 2;

FIG. 8 is a schematic view showing the transmission mechanism for the slidable clip of the machine as shown in FIGS. 1 and 7;

FIG. 9 is an elevation view on line B--B in FIG. 8;

FIG. 10 is a plan view on line C--C in FIG. 7 showing the operations of a crank actuating rod and a brush;

FIG. 11 is a plan view on line D--D in FIG. 7 showing how the new and the old warps are drawn out one by one from a row of yarns by a yarn picking movement of the brush;

FIG. 12 is a plan view on line D'--D' in FIG. 7 showing operation of a lease rod;

FIG. 13 is a front sectional view on line E--E in FIG. 7 showing the operation of the lease rod and a condition in which the new and the old warps hang crosswise;

FIG. 14 is a schematic view showing the operation of the lease rod and a condition in which the new and the old warps hang;

FIG. 15 is a side elevation view showing a detecting device within the tying machine;

FIGS. 16, 17, 18 and 19 are schematic perspective views of parts of the detecting device of FIG. 15;

FIG. 20 is a schematic elevation view of part of the device of FIG. 15;

FIG. 21 is a view similar to FIG. 20 showing the parts in positions when both the new and the old warps are simultaneously detected by a feeler;

FIGS. 22 and 23 are schematic plan and elevation views, respectively, showing the parts in positions when the machine stops due to some malfunctioning either in the new warp or in the old warp;

FIG. 24 is a schematic view showing how the yarn is drawn by the lease rod and a yarn drawing hook;

FIG. 25 is an enlarged plan view of a yarn cutting device;

FIG. 26 is a schematic perspective view of a yarn tying device and a transmission system therefor;

FIG. 27 is a schematic view of the withdrawal hook and hook guide cylinder for tying yarns;

FIG. 28 is a front elevation view showing the interior of the tying machine;

FIG. 29 is an enlarged sectional plan view taken on line X--X in FIG. 7;

FIG. 30 is a partial plan view of part of the machine as shown in FIG. 29 and showing the operation of the tying device;

FIG. 31 is a front view of a yarn end disposal device;

FIG. 32 is a side view partly broken away on line Y--Y in FIG. 31 and a schematic view of means for operating upper and lower pincher plates;

FIG. 33 is a perspective schematic view of means for gripping yarn ends;

FIG. 34 is an elevation view on line Z--Z in FIG. 32 and a schematic view of means for operating a bell crank;

FIG. 35 is a schematic view showing the manner in which the tying machine is employed when the said machine is installed on a power loom or a work bench by means of a rail installation frame;

FIG. 36 is a schematic view showing the installing of the said tying machine on a power loom by means on the rail installation frame; and

FIG. 37 is a schematic view showing the installing of the said tying machine on a work bench for tying warps.

DETAILED EXPLANATION OF THE INVENTION

As shown in FIGS. 1-3 of the drawings, the tying machine has a frame 1 which pivotally supports spaced grip rods 3 and 4 on opposite sides thereof on pivots 2 located at the tip end of frame 1, and on vertical extensions 3a and 4a thereof are mounted detectors 7 and 8 with yarn detecting pieces 5 and 6 for yarns formed thereon by bending the free ends under. A detecting device C is constructed by connecting the ends of levers 9 and 10 with supporting parts 3b and 4b of the foregoing grip rods 3 and 4, and the other ends of the said levers 9 and 10 are passed through guide grooves 12 and 13 of a guide rod 11 vertically mounted on the base of the foregoing frame 1. A worm wheel 14 is so supported that it rotates jointly with a guide roller 16 around a shaft 15 extending laterally from the base of the frame 1 and a worm 17 is fitted on a shaft 18 in engagement with the said worm wheel 14. On one end of worm 17 is a ratchet gear 19 which rotates with the worm 17.

An actuating arm 20 approximately in the shape of a Z is provided and shaft 18 is idly positioned in an elongated hole 21 in the lower end of actuating arm 20 and an elongated hole 22 is provided at the upper end 26 of arm 20. An eccentric shaft 24 on a hand wheel 23 shown in FIG. 2 is connected to a shaft 25 and extends through said elongated hole 22. The respective bases of pawls 27 and 28 are pivotally mounted on pins 29 at upper and lower points of the center part of the foregoing actuating arm 20 and, simultaneously with this, the pawl 27 and the pawl 28 are engaged with the tip ends of the said lever 9 and lever 10, respectively. Pawl ends 27a and 28a are normally supported so as to engage the foregoing ratchet gear 19. A ratchet pawl 30 is attached to the end of the foregoing frame 1 and is always engaged with the ratchet gear 19 under the action of a spring 32. The said control device B is mounted by screws 33 on one side of the tying machine as shown in FIG. 2. Rolling on a lower rail 34 are a guide roller 16a mounted on the tip end of frame 1 and a guide roller 16 mounted on the rear end of the frame 1, and an arm 35 extends out of the side of the tying machine and has roller 37 on the end thereof which engages an upper rail 36, whereby the tying machine is mounted slidably on the upper and lower rails 34 and 36 embracing the upper rail by means of the guide roller 37.

As shown in FIGS. 4-6, a fastener 38 pivotally and rotatably supports on pine 42 the ends of connecting rods 41 which are disposed parallel with a ring 40 projecting from one end of a receiving plate of a slidable clip 39. At the other ends of the respective connecting rods 41 is rotatably connected by pins 43 a clip lever 46 which is provided with a cam shaped end 44. A plate spring 47 projects from one end of a pressing plate 49 which freely opens and closes around a pivoted part 48 on the other end of the foregoing slidable clip receiving plate 39. Spring 47 has a pressure receiving part 51 which is bent moderately and corresponds to the foregoing cam shaped end 44 and projects along a guide 50 which, when the fastener is closed, supports the said rods 41 in parallel by extending into a space T formed between the foregoing connecting rods 41. The plate spring 47 is fixed by screws 52 at the one end of the foregoing pressing plate 49.

As shown in FIGS. 4 and 7-9, one of the foregoing slidable clips 39 is mounted on each of two rack bars 53 by setscrews 54 at the respective ends thereof and the rack bars are driven by intermediate gears 55 engaged with the respective rack bars 53 so as to slide them, as shown in FIG. 1, in the opposite direction to the direction of advance of the tying machine A. Thus the nearest new and old warps S.sub.1 and K.sub.1 of the new and old warps S and K, which are held in the foregoing respective slidable clips 39, touch one by one a feeler 56 described below. The intermediate gears 55 engage with transmission gears 58 which are coaxial with pawl gears 57 adjacent thereto, and each pawl gear 57 engages with a respective pawl 60 pivoted on opposite sides of an advance control plate 59. Each rack bar 53 thus moves in a longitudinal direction in response to the upward movement of a rack bar 61, as described hereinafter, which rotates the pawl gears 57 by the advance pawls 60. Each of the new and the old warps S.sub.1 and K.sub.1 is pressed against the said feeler 56, the inner end 64 of which engages in an elongated hold 62 in the said advance control plate 59. A support rod 69 for the feeler is displaced a little in the same direction as the foregoing rack bar 61 against the force of a spring 63. The inner end 64 of the feeler is inserted through the advance control plate, as shown in FIG. 9, to support the advance control plate 59 and a space is provided between the lower end of the said plate 59 and the upper dead point of the rack bar 61 so that the said plate 59 is not actuated. The rack bar 61 can be disengaged by moving guide wheels 65 in the axial direction and rack bars 53 can be inclined upwardly around the foregoing setscrews 54 to release engagement between the rack bars 53 and the intermediate gears 55. In this condition, the rack bars 53 can be returned to their original starting point for the operation by pushing the rack bars 53 forward (to the left in FIG. 8).

As shown in FIGS. 7, 10 and 11, at the tip end of crank actuating rods 67, the other ends of which are pivotally connected with crank gears 66, opposed brush support metal fittings 68 are mounted approximately in a straight direction and, at the tip of these fittings 68, brushes 69 are disposed with the bristles projecting toward each other. As each brush 69 rotates from the outside inwardly half a revolution around support rods 70 as a center during the rotation of the foregoing crank gears 66, the nearest new and old warps S.sub.1 and K.sub.1 in the row of new and old warps previously hung in shedding and bearing conditions along lease rods 71, described hereinafter, are separated from the rest of the warps and drawn one by one into the path of rotation of a yarn drawing hook 72. The foregoing crank gears 66 are supported on auxiliary shafts 73 and 74 and are driven by a transmission gear 77 on a main shaft 76 via a driven gear 75 on the said auxiliary shaft 74, and the main shaft 76 is driven by a pair of bevel gears 79 and 80, the gear 80 being on main shaft 76 and the gear 79 being on the end of the shaft 78 for the hand wheel 23.

As shown in FIGS. 7 and 11-14, an upper pair and a lower pair of the lease rods 71 and 71' are provided and are connected by a connecting plate 83 and they are rotated around the axes of the rods 71 and 71' by small gears 81 on the ends thereof, being guided by the plate 83 which fits in circular grooves 82 in bosses 85 on rods 71 and 71'. The small gears 81 are engaged with the foregoing rack bar 61 and rotate back and forth through 180.degree., respectively, during the up and down movements of the said rack bar 61. Slidably positioned in bosses 85 are push rods 84, the ends of which alternately push the row of new warps S and old warps K. An actuating plate 87 has rollers 86 thereon and a horizontally elongated hole 88 therein and approximately in the center thereof through which the main shaft 76 extends. Plate 87 is joined with the said connecting plate 83. A cam 89 on the main shaft 76 engages the rollers 86 and, during the rotation of the said cam 89, the actuating plate 87 reciprocates between the position indicated by the solid line and the position shown by the chain line, and thereby each push rod 84 moves freely back and forth in the direction shown by the arrow P.sub.1 along the respective lease rods 71 and 71' via the connecting plate 83. The push rods 84 slide in grooves 90, which extend in the axial direction of the respective lease rods 71 and 71'. Upper and lower rollers 91 are mounted on the rack bar 61 and are engaged by cam 89' on the handle shaft 78 during rotation of cam 89'. Handle shaft 78 passes through an elongated hole 88' in the rack bar 61, as shown in FIG. 13. During movement of the cam 89' through half a revolution, half a revolution of 180.degree. is given to the respective lease rods 71 and 71' by the small gears 81 engaged with the said rack bar 61.

A detecting device D having casing 92 of almost U-shape is, as shown in FIGS. 15-19, mounted within the upper part of the tying machine and slidable rods 95 are freely slidable in a non-loaded condition in guide grooves 94 in guide plates 93, provided at the upper part of the said casing 92. The said rods 95 both have a notch 96 in the lower edge thereof and end notches 97 at one end thereof. Near said one end of these slidable rods 95 are retreat control pins 98 and advance control pins 99 which project from the rods so as to control the extent of the retreat and the advance movements of the rods. Further, latch parts 111 are provided at the other ends of the rods 95 to engage with the upper part of feelers 100, as described hereinafter. Control plates 112 project horizontally and symmetrically toward each other from the respective slidable rods 95 from points in the neighborhood of the said notches 96. Actuating levers 113 for the slidable rods are provided with curved edges 114 which contact a cam 123 of a required curvature, as described hereinafter, and the lower end of each lever 113 is fixed at the same angle on a shaft 115 provided in the lower part of the machine casing 92.

On the respective upper free ends of these actuating levers 113 are curved plates 116 having a moderate curvature and engagable with the bottom edges of the slidable rods 95 for pushing the slidable rods upwardly. At the ends of the curved plates are engaging pawls 117 bent almost at 90.degree. to the curved plates 116 for withdrawing the slidable rods 95 by engaging the notches 96 at the time of the actuation of the foregoing actuating levers 113. A cam shaft 118 is supported in parallel with the shaft 115 and a driven gear 120 is rotatably mounted on the middle of the said cam shaft 118. Gear 120 is engaged with a transmission gear 119 on main shaft 76. On both sides thereof, pawl cams 121 provided with pawls 121a are idly rotatably mounted as shown in FIG. 18. Pawl cams 121 are urged toward gear 120 in the axial direction of the cam shaft 118 by coil springs 122, and engage with latch pawl 126 on pawl levers 124 described below, so that an impact caused by the engagement of the pawls 121a on pawl cams 121 with the pawl levers while the cam shaft 118 is rotating is absorbed by the elasticity of coil springs 122. Cams 123 having cam profiles 123a are mounted on the same shaft 118 and they rotate together with the cam shaft 118. Said cams 123 strike the curved edges 114 of the slidable rod actuating levers 113 on the shaft 115 during each revolution of the same cam shaft 118, and this causes the slidable rods to move in the one direction. Pawl levers 124 are mounted on a shaft 125 parallel with the foregoing cam shaft 118 in the upper part of the machine casing 92 and have the latch pawls 126 at the lower ends thereof. If both or either one of the new and the old warps S.sub.1 and K.sub.1 are not detected by the foregoing feelers 100, the whole operation of the foregoing tying machine A stops by means of the engagement of the pawls 121a with the said latch pawls. Release pins 127 project from the latch pawls 126 in the direction of the shaft 125. A manual lever shaft 128 is positioned parallel to and under the shaft 125 and pawl cams 129 are mounted thereon in line with release pins 127. In operation, after excluding some malfunctioning caused by a yarn of the new and the old warps, the release pins 127 are struck from the direction indicated by an arrow by means of the respective pawl cams 129 by the operation of the handle 128 on the foregoing manual lever shaft 128, whereby the engagement of the latch pawls 126 on the pawl levers 124 with the respective pawls 121a of the pawl cams 121 is released.

In FIG. 15 the main shaft 76 on which the foregoing transmission gear 119 is mounted, is perpendicularly arranged within the tying machine A and the main shaft 76 is driven by the engagement of the bevel gear 80 on the shaft 76 with a bevel gear 79 on the end of the handle shaft 78. The upper ends of the feelers 100 are connected with the latch parts 111 on the slidable rods 95 while the middle of said feelers is pivotally supported on support rods 133 projecting from one side of the tying machine A.

Held between the slidable clips 39 and pressing plate 49 are about the same number of respective ends of the groups of the new and the old warps S and K, and the said new and old warps S and K are passed over the respective lease rods 71 and 71' in the same manner as in the shed of a loom. That is, every other yarn is passed on one side of an upper lease rod and on the other side of a lower lease rod, and the remaining yarns are passed on the other side of the upper lease rod and the one side of the lower lease rod. With this arrangement, only the nearest new and old warps S.sub.1 and K.sub.1 on the side of the lease rods on which yarns are not pressed by the push rods 84 will be free to be pulled one by one from the warps to a stand by position 72a, as shown by a chain line in FIG. 24 to be picked up by the yarn drawing hook 72 and moved to position 72b. The yarn drawing hook 72 is constructed so that the old warp K.sub.1 is picked up in yarn groove 141 and the new warp S.sub.1 in yarn groove 142.

A yarn cutting device E is mounted on the device just above the lease rods 71 and 71' and has a hook arm 144 with a yarn picking hook 134 thereon, as shown in FIGS. 1 and 25, and is mounted on a drive shaft 143 driven by the main shaft 76. A stationary blade 145 is mounted on the device and a movable blade 148 engaged with a fixed cam 147 through a roller 146 is positioned to cooperate with stationary blade 145 as it is moved during the rotation of the cutting device by the fixed cam 147. The blades 145 and 148 cut the new and the old warps S.sub.1 and K.sub.1 drawn in by the yarn picking hook 134 during its rotation.

A tying device F is, as shown in FIGS. 1 and 26-30, mounted on the sides of the apparatus and is provided with a hook guide cylinder 151 through which a withdrawal hook 150 with a hook 149 at the end thereof moves back and forth. Said cylinder 151 engages, through a guide piece actuating gear 152 on the circumference thereof, with a spur gear 153 driven by the main shaft 76. A boss 154 on the said cylinder 151 has a guide piece 155 projecting toward the end of cylinder 151 which winds the new and the old warps S.sub.1 and K.sub.1 around the said cylinder 151 after picking them from the foregoing yarn drawing hook 72 and picks their ends onto the hook 149 projecting from the end of the said cylinder 151 as the boss 154 and guide plates rotates. At the same time, the new and the old warps S.sub.1 and K.sub.1 are hooked by the hook 149, the said cylinder 151 moves together with the boss 154 in the direction shown by an arrow Q to move the cylinder 151 over the hook 149.

Then, in order to tie the two warps S.sub.1 and K.sub.1, in a circular groove 156 at the end of the said guide piece actuating gear 152 is connected a pin 160 on one end of a lever arm 159 on which a roller 158 is securely mounted almost at the center thereof and which has the other end pivoted on a supporting shaft 157. The roller 158 is engaged in a cam groove 162 provided in a cam 161 mounted on the main shaft 76. The hook guide cylinder 151 and the boss 154 are movable back and forth in the direction of the arrow Q by the lever arm 159 and the pin 160 during the rotation of the cam 161. The shape of the cam groove 162 is such that the amount of the advance and retreat movement of the withdrawal hook 150 with the hook 149, the hook guide cylinder 151, the boss 154 with the circular groove 156 and the spur gear 153 is properly controlled to achieve tying of the warps S.sub.1 and K.sub.1, and then release from hook 149.

As shown in FIG. 1, a disc 136 is provided which supports the yarn drawing hook 72 on an arm 137. The disc 136 is mounted on the lower end of the main shaft 76 driven by hand wheel 23 so that the said hook 72 rotates on the disc 136 one revolution around the circumference of the tying machine A for every revolution by the hand wheel 23. Just past the tying device F in the direction of the movement of the said hook 72 is a clipper 138 which cuts off unnecessary yarn ends from the tied new and old warps S.sub.1 and K.sub.1, and a yarn ends receiving box 139 into which the said yarn ends are thrown as described hereinafter. The said box 139 and the tying device F are, as shown in FIGS. 1 and 31-34, disposed side by side on the one side of the foregoing tying machine A. A lever 166 having an angle shape contacts the circumference of a cam 165 on the main shaft 76. In the interior of the said yarn ends receiving box 139 is fixed a guide plate 168 in the shape of a sectional angle with a longitudinal hole 167 thereon and on one part thereof a part of a lever 171 of a lower pincher plate 170 is rotatably pivoted on a pin 169. The said lever 171 has one end projecting outside of the said yarn ends receiving box 139 through the longitudinal hole 167. The lower pincher plate 170 is bent upwardly at an adequate angle. Lower grip pawls 172 project at spaced intervals T from the upper edge of plate 170. An upper pincher plate 173 is fixed to the one end of a shaft 175 which is rotatably supported in fittings 174 on the inner wall of the foregoing box 139. On one side of upper pincher plate 173 are upper grip pawls 176 which move back and forth in the respective spaces T between the projections on the lower pincher plate 170. At the one end of the shaft 175 is mounted a control lever 177 to control excessive rotation of the upper pincher plate 173.

On the back side of the foregoing yarn ends receiving box 139, a bell crank 178 is rotatably mounted on a shaft 179 and one end thereof contacts the tip end of the lever 166 while the other end thereof contacts a part of an actuating rod 181 through a connecting rod 180. The said actuating rod 181 is rotatably attached to connecting rod 18 by means of a pin 182 and the other end of rod 181 contacts the one end of the lever 171. A tension spring 183 is connected to the one end of the said lever 171 so that the lower pincher plate 170 is pressed upwards around the pin 169.

As seen in FIGS. 1 and 35-37, a rail frame 184 is provided with rail support arms 185 at the upper and the middle parts thereof which support the upper and lower rails 36 and 34, and at the lower part thereof is provided a hook arm 188 with hooks 187 supporting yarn latch rods 140 for the new and the old warps S and K. Two or three tying machines are detachably mounted by means of attaching parts 191 and 192 as shown in FIG. 36 on a power loom 189 or a work bench 190 for performing warp tying. New warps S are drawn from a beam 193 and old warps K from a power loom 189 or the other beam on a work bench 190, respectively, and approximately the same number are held one by one, as shown in FIGS. 1 and 7, by the foregoing slidable clips 39.

OPERATION

There will be described an example in which a tying machine A is mounted on upper and lower rails 36 and 34 by rail support arms 185 on either a power loom 189 or a work bench 190, as shown in FIG. 36 or FIG. 37. Ends of the new warps S wound on the beam 193 are automatically and successively tied with corresponding ends of the old warps K being used in a weaving process. First of all, about 200 to 300 yarns from the old warp K being used in the weaving process and about the same number of yarns from the new warps S wound on the beam 193 in FIG. 36 are, as shown in FIGS. 4-6, placed between the slidable clip 39 and the pressing plate 49. Said plate 49 is pressed against the interior surface of the clip 39 by pivoting it around the pivot 48. Then, the fastener 38 pivoted on the ring 40 of the said slidable clip 39 is rotated against the pressing plate 49 as shown by an arrow P in FIG. 5 around the pin 42 and into the space T between the connecting rods 41 is fitted the end of the plate spring 47 which is disposed parallel with the guide 50 on the pressing plate 49. The clip lever 46 is then rotated in the direction of arrow Q around the pin 43 and the pawl latch 45 is pressed onto the surface of the plate spring 47. The fastener is thus tightened to hold about the same number of new and old warps in the clips 39.

The new and the old warps S and K hang, respectively, as shown in FIG. 14 with alternate yarns on opposite sides of lease rods 71 and 71' in a shedding condition for tying as described above. When the hand wheel 23 is rotated in the required direction, the bevel gear 79 at the interior end of the shaft 78 shown in FIG. 8 rotates and, by the bevel gear 80 engaged therewith the main shaft 76 is rotated. Cam 89' on shaft 78 also rotates and through rollers 91 reciprocates the rack bar 61 vertically to move the elements engaged therewith respectively. The disc 136 at the lower end of the main shaft 76 and the yarn drawing hook 72 on the arm 137 on the said disc are moved in the required direction. At the same time, by the rotation of the hand wheel 23 shown in FIGS. 2 and 3 in the direction of arrow P, the upper end 26 of the actuating arm 20 coupled therewith by shaft 25 also moves in the direction of arrow P by the movement of the shaft 25 extending through the elongated hole 22 to the actuating arm 20 in the direction of arrow P.sub.2. Pawls 27 and 28 mounted on the said actuating arm 20 by the pins 29 move in the direction of arrow P.sub.2 to engage the pawl part 27a and 28a with the ratchet gear 19. Rotation of hand wheel 23 through 180.degree. advances the ratchet gear 19 and the worm 17 on the shaft 18 to drive the worm wheel 14 engaged with the said worm 17. This rotates the guide roller 16 on the shaft with the said worm wheel 14 so that the tying machine A moves, as shown in FIG. 1, slightly in the direction of arrow P.sub.1 while being guided by the guide roller 37 which embraces the upper rail 36.

Further, upon rotation of the said hand wheel 23 through another 180.degree., the actuating arm 20 moves in the reverse direction to the foregoing direction around the shaft 25 as the center. Consequently, the pawl parts 27a and 28a of the pawls 27 and 28 disengage from the ratchet gear 19 and return to their original position. By successively rotating the hand wheel 23, the tying machine A is moved continually at regular intervals along rails 34 and 36.

By the vertical reciprocating motion of the said rack bar 61, which is synchronized with the movement of the said tying machine A in the direction of arrow P.sub.1, the respective small gears 81 engaged with the said bar 61 are, as shown in FIGS. 7 and 12-14, rotated back and forth through 180.degree..

The same reciprocating rotational motion is given to the respective lease rods 71 and 71' on which these small gears 81 are provided. In order to alternately push back each row of the new and the old warps S and K hung as shown in FIG. 11 on opposite sides of the respective lease rods 71 and 71' by the push rods 84 in the grooves 90, a reciprocating motion in the axial direction of the respective lease rods 71 and 71' is given to the push rods 84 by the actuating plate 87 driven by rotation of the cam 89 on the main shaft 76 which alternately engages the rollers 86 on the plate 87 on opposite sides of the said plate 87, as shown in FIG. 12. With the actuating of the plate 87, the push rods 84, which are engaged in the grooves 82 on opposite sides of the connecting plates 83 on the one end of the said plate 87, the said push rods are moved parallel with the respective lease rods 71 and 71' in the direction of the advancing movement of the tying machine A, as shown in FIGS. 10 and 12. Further, the end of each of the crank actuating rods 67 with the brushes 69 at the tip ends thereof is driven by the crank gears 66 from the driven gear 75 on the auxiliary shaft 74, which in turn is engaged with the transmission gear 77 on the said main shaft 76, so that each crank actuating rod 67 makes the respective brush 69 thereon perform a circular motion inwardly around the supporting rod 70 as a center. Simultaneously, the tip end of each brush 69 engages, as shown by the solid lines in FIG. 11, the yarn row on the side of the lease rod which is not pressed by the push rods 84 and draws back toward the device the yarn S.sub.1 and K.sub.1 of the warps S and K, which is at the nearest end of each yarn row. Thus, the nearest yarns are separated one by one from the other yarns and, at the same time, by the restoring force due to the elasticity of yarns themselves, they assume a perpendicular position in the path of rotation of the yarn drawing hook 72, as shown in FIG. 1. Simultaneously with this, a part of the respective new and old warps S.sub.1 and K.sub.1 touch the feeler 56 and the feelers 100 of the detecting device D.

Grip rods 3 and 4 of the detecting device D advance together. Therefore, when the new warp S.sub.1 and the old warp K.sub.1, hung between the yarn latch rods 140 and 140' at the bottom of the machine and the slidable clip 39 at the top of the tying machine A, touch the detecting pieces 5 and 6 at the same time, or one of them touches first, the force with which they press on the pieces 5 and 6 causes the grip rod 3 or 4 to pivot around the shaft 2 in the direction as shown by the arrows. Consequently, the levers 9 and 10 connected to said grip rods 3 and 4 are moved upwards and the pawls 27 and 28 engaged by said levers 9 and 10 are pivoted upwardly around the pins 29. The ratchet gear 19 is not rotated, and therefore the tying machine A does not advance, even if the hand wheel 23 is rotated further.

In this case, if the group of warps S (FIGS. 1 and 7) in front of the detecting piece 5 are very close together, and the group of warps K in front of the detecting piece 6 are spaced apart, the detecting pieces 5, while advancing, will touch the warp S.sub.1 first before the detecting piece 6 touches the warp K.sub.1. The grip rod 3 for the piece 5 which was touched first nevertheless is actuated to disengage the pawl 27 by means of the lever 9. However, the pawl 28 connected with the detecting piece 6 which has not yet contacted the warp K is still in a position in which it is possible to engage the ratchet gear 19, and therefore the tying machine A continues to advance. Consequently, the movement thereof continues until one yarn in the group of warps K is touched by the detecting piece 6. By this means, the new and the old warps S.sub.1 and K.sub.1 are always positioned on particular lines by detecting pieces 5 and 6, and when in these lines they touch the feelers 56 and 100. Simultaneously with the foregoing operation, the respective new and old warps S.sub.1 and K.sub.1 press on the feeler 56, whereby the feeler support rod 64, which supports the said feeler 56, is displaced to some extent in the opposite direction to the arrow P.sub.1 against the force of the spring 63. The interior end of the feeler support rod 64 is, as shown in FIGS. 8 and 9, extended through the elongated hole 62 in the advance control plate 59, which moves up and down, and thereby the said control plate 59 is stopped in the raised position and transmission from the rack bar 61 is stopped at the upper dead point of the rack bar 61, so that the bar 61 runs idly with respect to control plate 59. At the same time as this operation, a part of the new and the old warps S.sub.1 and K.sub.1 touches the feelers 100 supported by the latch parts 111 on the slidable rods 95 and by the supporting rods 133. Then the new and the old warps S.sub.1 and K.sub.1 in the path of rotation of the yarn drawing hook 72 in the stand-by position are drawn by means of the yarn picking hook 134 shown in FIGS. 1 and 15 towards the side of the tying machine A. Therefore, the feelers 100 move, as shown in FIG. 15, the slidable rods 95 to which the feelers are connected through the latch parts 111 in the foreward direction, and the respective end notched parts 97 in the lower part of the rear ends of the respective rods are pulled through the guide grooves 94 in the guide plate 93. The movement is stopped by the abutment of the respective advance control pins 99 with the guide plate 93.

Simultaneously with the foregoing, the control plates 112 provided opposite each other on the inside of the slidable rods 95 engage the pawl levers 124 and move the respective hook pawls 126 on the respective pawl levers out of engagement with the pawls 121a on the pawl cams 121 on the cam shaft 118. This condition is maintained for a short time while the new and the old warps S.sub.1 and K.sub.1 are picked up by the yarn drawing hook 72, as shown in FIG. 24, during the movement of the said yarn drawing hook and moved to positions shown by 72a and 72b. Simultaneously, the new and the old warps S.sub.1 and K.sub.1 are drawn by the yarn picking hook 134 shown in FIG. 25 successively into the space between the stationary blade 145 and the movable blade 148. The warps are cut by the blades when the movable blade is actuated as it moves past the protrusions on the cam 147.

Simultaneously with the said cutting, the cams 123 on the cam shaft 118 rotate in the direction of the arrow in FIG. 20 and the cam profiles 123a contact the respective curved contact surfaces 114 so that the respective slidable rod actuating levers 113 are moved in the rearward direction around the shaft 115 and push the lower surface of the slidable rods 95 contacted thereby upwards by means of the curved plates 116 provided at the tops of the respective levers. The engaging pawls 117 thereof are then hooked into one end of the notches 96 in the slidable rods 95 and the respective end notched parts 97 are raised upwardly in the guide grooves 94 so that they do not engage plate 93. The retreat control pins 98 on the slidable rods 95 then engage the interior side of the guide plate 93 and the movement of rods 95 is stopped and the machine is restored to its starting condition for the next operation. The foregoing operation is repeated under normal conditions each time the new and the old warps S.sub.1 and K.sub.1 are successively drawn to the standby positions.

However, if either of the new or the old warps S.sub.1 or K.sub.1 does not contact one of the feelers because they are widely spaced or warps are twisted due to an extremely crowded arrangement or only one yarn contacts with a feeler and the other yarn is broken, and so forth, the feeler 100 on the side where a yarn is detected and the slidable rod 95 corresponding thereto is actuated as outlined above, while the other slidable rod does not move. Therefore, the relative positions of the slidable rods 95 become different, as shown in FIGS. 22 and 23. The pawl lever 124 corresponding to the unmoved slidable rod 95b is not subjected to the action of the plate 112 for said rod 95b. This causes the actuation of the detecting device D for stopping the apparatus by the hook pawn 126 of the pawl lever 124 engaging with the pawl 121a of the pawl cam 121 on the cam shaft 118. This blocks rotation of gear 120, gear 119 and main shaft 76, and the operation by the wheel 23 is thus stopped.

When the improper yarn condition is corrected, the manual lever shaft 128 shown in FIGS. 1 and 16 is operated by the handle 128a in the direction of the arrow, the pawl cams 129 on said shaft 128 rotate in the same direction as said lever shaft so that the pawl lever 120 in the path of rotation thereof is moved in the same direction. By the displacement of the said pawl lever 124, the hook pawl 126 thereon is released from its engagement with the pawl 121a of the pawl cam 121 on the cam shaft 118 to allow the main shaft to rotate again. Thus, if either of the new or the old warps S.sub.1 or K.sub.1 is not properly positioned, the whole operation of the tying machine A is immediately stopped on the spot. By correcting the condition of the yarn to the normal condition of the new and the old warps S.sub.1 and K.sub.1 with both warps side by side in correct positions and touching the feelers 100, the operation is resumed.

The new and the old warps S.sub.1 and K.sub.1 which are cut by the said yarn cutting device E are picked up by the yarn drawing hook 72 during its movement and carried to the tying device F along the path of rotation of the said hook, the hook passing the said yarn tying device F and reaching the neighborhood of the position 72a shown by a chain line in FIG. 1. A part of the respective new and old warps S.sub.1 and K.sub.1 are engaged over the boss 154 in FIGS. 26 and 27 and picked by the guide piece 155 during its rotation. At the same time, the yarn ends of the new and the old warps S.sub.1 and K.sub.1 extending between boss 154 and the hook at position 72a are cut off by the clipper 138. Simultaneously with this cutting, when the new and the old warps S.sub.1 and K.sub.1 picked by the guide piece 155 are guided by the said guide piece 155, they rotate, as shown in FIG. 26, through one revolution while being wound around the circumference of the hook guide cylinder 151. The hook guide cylinder 151 starts to slide together with the boss 154 in the opposite direction to the arrow Q by the rotation of the cam 161 as described and shown in FIG. 30 previously, on the main shaft 76 as the roller 158 on the lever arm 159 is guided within the cam groove 162 of the said cam. The hook 149 at the tip end of the withdrawal hook 150 which projects out of the interior of the said hook guide cylinder 151 hooks the ends of the new and the old warps S.sub.1 and K.sub.1 which are drawn into the said hook 149 as shown in FIG. 26.

Simultaneously with the said drawing-in operation, the position of the roller in said cam groove 162 is changed to cause a reverse or outward movement of the boss 154 and the hook guide cylinder 151 in the direction of the arrow Q shown in FIGS. 26 and 30 over the hook 150 to pass the loop of the warps over the ends thereof, thus tying warps S.sub.1 K.sub.1 together. The position of roller 158 in the cam groove 162 is successively changed, whereby the united warps are pushed off the hook guide cylinder 151 and drop downwardly in a good order over the yarn latch rod 140' as shown at Z in FIG. 1.

Immediately before the yarn ends F.sub.1 of the warps S.sub.1 and K.sub.1 which are cut off by the clipper 138 are about to be cut off, they are gripped between the upper and the lower grip pawls 176 and 172 on the yarn end receiving box 139 as shown in FIGS. 1 and 31-34. Simultaneously with the separation of the respective yarn ends from the yarn drawing hook 72 by the further movement of said hook 72 along its circular path, the yarn ends are cut off by the clipper 138 shown in FIG. 1.

At the same time as the foregoing operation, the cam 165 on the main shaft 76 shown in FIGS. 1 and 32 makes one revolution and the profile thereof engages the lever 166, which in turn engages one end of the bell crank 178. The bell crank 178 is pivoted around the shaft 179 to position 178a, shown by chain lines in FIG. 34, and the actuating rod 181 linked with the end of the said bell crank by the connecting rod 180 is pivoted around the shaft 182 to the position shown by the chain lines 181a. The free end of the lever 171 on the lower pincher plate 170 is pivoted upwards around the pin 169 and the said lower plate 170 is displaced in the direction of the curved arrow P in FIGS. 32 and 33 to the position shown by the chain line 170a. At the same time, the upper pincher plate 173 which rests on the lower pincher plate 170 due to its own weight is inclined downwardly as shown by chain lines 173a and the control lever 177 of the shaft 175 thereof engages with part of the plate 164 shown in FIGS. 21 and 32, which acts as a stop.

In the foregoing case, the respective yarn ends F.sub.1 are pinched underneath the respective lower grip pawls 172 of the lower pincher plate 170, as shown in FIG. 33, and, therefore, by inclining the lower pincher plate 170, the yarn ends are, while being pinched in the horizontal direction, pushed down from the upper surface of the respective upper grip pawls 176 into the yarn ends receiving box 139. Simultaneously with the separation of the yarn ends F.sub.1 from the respective upper grip pawls 176, the relationship between the cam 165 and the lever 166 is restored to the original relationship, as shown in FIG. 33 and, also, the bell crank 178 and the actuating rod 181 are restored to their original positions and, at the same time, the lower pincher plate 170 is restored to the original position by the force of the tension spring 183 connected to the end of the lever 171. The upper pincher plate 173 is pushed upwards for the next operation.

The tying machine A continually performs the tying of the new and the old warps by repeating the described operation.

EFFECTIVENESS OF THE INVENTION

The tying machine of the present invention automatically carries out the tying of a new warp to an old warp in a weaving apparatus. Therefore, it differs from the conventional type weaving machine wherein extremely laborious work is performed manually for tying the new warps to the old warps one by one. In many cases, some pairs of warps will not be tied in the hand tying due to insufficient twisting and tying of the new and the old warps. Moreover, the efficiency of the overall weaving operation is greatly reduced because the weaving machine is idle for many hours. The efficiency of weaving can be greatly increased by the employment of the present tying apparatus by which the tying of warps can be performed in a short time.

In the present invention, the detecting device C is provided so that movement of the tying machine A stops only when the new and the old warps S.sub.1 and K.sub.1 are detected as being on the same and proper line during the advancement of the said detecting pieces 5 and 6. In case either one of the new warps or the old warps S or K are crowded and the other is widely spaced, the detecting piece which touches the warp at the front crowded warps actuates the detector and disengages one of the pawls 27 or 28 and the ratchet 19, but the other pawn coupled with the detecting piece not in contact with a yarn remains in engagement with the ratchet 19 and causes the tying machine A to continue to move until the detecting pieces 5 and 6 engage both the new and the old warps S.sub.1 and K.sub.1 such that they are in the proper line. Consequently, even if the warps are crowded or widely spaced, the tying machine can be easily guided so as to bring the new and the old warps S.sub.1 and K.sub.1 smoothly into the path of rotation of the yarn drawing hook 72.

Also, in the present invention, by the provision of the fastener 38 and the plate spring 47 in the clips 39 and plate 49, the new and the old warps S.sub.1 and K.sub.1 are held tightly between the clip 39 and the pressing plate 49. Therefore, even if tension is exerted on the warps by the lease rods, the clip 39 and the pressing plate 49 continue to hold the warps. Since fastener 38 is a flip-flap type fastener, it cannot be easily opened, even if it is acted on by a yarn which might get caught on the pawl latch 45 or by vibration or the like to which it is subject.

Further, in the present invention, where the yarns are difficult to separate from each other due to nap or the like, the brushes 69 are mounted so that their angles with respect to the row of yarns can be adjusted freely so that the yarns can be easily and smoothly separated from each other.

In this invention, the pairs of upper and the lower lease rods 71 and 71' with the push rods 84 thereon rotate back and forth through about half a revolution of 180.degree.. By alternately pressing back the rows of the respective new and old warps S and K, the nearest yarns in the respective rows are left free and are positively drawn one by one to the stand-by position in the path of rotation of the yarn drawing hook 72 by the yarn picking brushes 69.

Further, in the present invention, the feelers 100 extending ahead of the tying machine A reliably detect whether the new and the old warps S.sub.1 and K.sub.1 are properly positioned in the path of rotation of the yarn drawing hook 72 and when one or the other of the said warps is not properly positioned, the operation of the tying machine A is stopped at once so that the condition can be corrected. Thus, the tying is correctly accomplished.

Moreover, the apparatus of the present invention is so designed that the new and the old warps S.sub.1 and K.sub.1 which are positioned in the path of rotation of the yarn drawing hook 72 in the stand-by position are separately picked up in the yarn grooves 141 and 142 of the yarn drawing hook 72 and, regardless of the size of yarns, the yarns are positively delivered to the tying device F.

Further, in the apparatus of the present invention, those parts of the new and old warps S.sub.1 and K.sub.1 which are picked up by the yarn drawing hook 72 from the stand-by position are also hooked by the yarn picking hook 134 and by means of the yarn cutting device E, the part of the new and the old warps S.sub.1 and K.sub.1 between the yarn drawing hook 72 and the slidable clip 39 is positively cut by the stationary blade 145 and the movable blade 148. This differs from the prior art method wherein cutting is achieved by pressing yarns against a stationary blade after tying. The prior art process is easily upset by mistiming of the cutting caused by stretching of elastic yarn. In the present invention, the tying process can be smoothly and reliably performed due to the positive cutting of the new and the old warps S.sub.1 and K.sub.1.

The apparatus of the present invention is so designed that the withdrawal hook 150 having the hook 149 thereon is slidable within the hook guide cylinder 151 and the ends of both warps S.sub.1 and K.sub.1 are hooked in the hook 149 after they are wrapped around hook guide cylinder 151 by the guide piece 155. The warps S.sub.1 and K.sub.1 are tied by subsequent movement of the said hook guide cylinder 151 over hook 150.

Finally, the apparatus of the present invention is so designed that the yarn ends F.sub.1 of the new and the old warps S.sub.1 and K.sub.1 which are drawn to the tying device F by the yarn drawing hook 72 are cut off after they are pinched between the respective upper and lower grip pawls 172 and 176 of the upper and the lower pincher plates 173 and 170. Therefore, no matter whether a yarn is shrinkable or weak, it will be neatly received in the yarn ends receiving box 139 and, moreover, the yarn ends F.sub.1 are received side by side in good order without being scattered around.

Claims

What is claimed is:

1. A warp tying machine comprising a machine body, old and new warp yarn gripping means projecting from said body for gripping old and new warp yarns in side by side positions, lease rod means positioned below said yarn gripping means and projecting from the machine body in the same direction for guiding the warp yarns in movement toward said machine body, yarn drawing means movable along said least rod means for drawing old and new warps along said lease rod means toward said machine body to stand-by positions, a yarn drawing hook mounted on said machine body and movable in a path of revolution around said machine body, said path including said stand-by positions, yarn cutting means on said body having means movable around said warp yarns when they are in the stand-by positions for engaging said yarns and positive action cutting means for cutting the engaged yarns, yarn tying means on said body along the path of said yarn drawing hook for receiving the old and new warp yarns which have been cut and tying them together, a first yarn detecting device having detecting elements projecting from said machine body for detecting whether the advance of the machine toward the old and new warp yarns has reached the positions of such yarns and means coupled to said detecting elements for stopping advance of said machine only when both an old and a new warp yarn have been detected, and a second yarn detecting means having feeler means projecting from said machine body for detecting the presence of said yarns in said stand-by positions and having means actuated by said feeler means for blocking movement of said machine when a yarn is not detected in either position.

2. A warp tying machine as claimed in claim 1 further comprising means for driving said machine along rails in a direction to engage warp yarns, including ratchet and pawl means and said detecting elements comprise detectors for engaging the old and new warp yarns, and said means for stopping the advance of said machine comprise lever means coupled with said detectors and engaging the pawl means of said ratchet and pawl means for disengaging said ratchet and pawl means when said detectors engage a yarn, whereby said machine is advanced until both detectors have engaged yarns and said detectors holding said yarns in said stand-by positions when the advance of said machine is stopped.

3. A warp tying machine as claimed in claim 1 in which said feeler means of said second yarn detecting means comprises a pair of feelers projecting into the positions of the old and the new warp yarns in the stand-by positions thereof, and said means actuated by said feeler means comprises movable members and blocking means engaged by said movable members unless said movable members have been moved by the action of said feelers in engaging yarns.

4. A warp tying machine as claimed in claim 3 in which said means actuated by said feelers comprises a freely slidable rod coupled with each of said feelers, guide plates in which said slidable rods are guided for sliding movement, rotatable cam and pawl means coupled with the remainder of said machine and rotatable during the operation of said machine, a blocking pawl lever for each slidable rod and in the rest position of said machine engaged with said rotatable cam and pawl means for blocking rotation thereof, and pawl lever control plates on said slidable rods for engaging said slidable rods on movement thereof and disengaging them from said rotatable cam and pawl means when said feelers are engaged by warp yarns in the stand-by positions thereof, whereby when said feelers detect yarns, the slidable rods are moved to free said rotatable cam and pawl means and the machine can continue its operation, and when one or the other of said feelers fails to detect a yarn, the slidable rod does not move and the blocking pawl lever is not disengaged from said rotatable cam and pawl means, and the further movement of said machine is blocked.

5. A warp tying machine as claimed in claim 1 in which said lease rod means comprises a plurality of pairs of lease rods mounted one above the other, each lease rod being mounted for rotation around the longitudinal axis thereof back and forth through one-half revolution and a push rod slidably mounted on each of said lease rods for sliding movement therealong for pushing warp yarns passing over the lease rods away from said machine body and leaving the closest warp yarns free to be engaged by said yarn drawing means.

6. A warp tying machine as claimed in claim 5 in which the push rods on each pair of lease rods are on opposite sides of the lease rods so that the push rods are opposed to each other in one rotational position of the push rods and the push rods on the next lower pair of push rods to a given pair of push rods are on the opposite sides of the push rods from the push rods in said given pair.

7. A warp tying machine as claimed in claim 1 in which said yarn cutting means comprises a hook arm rotatably mounted on said machine for rotation in a path which carries said hook arm around the yarns in said stand-by positions, a fixed blade on said hook arm, a movable blade pivotally mounted on said hook arm at a position to cooperate with said fixed blade on said hook arm, and a cam on said machine for engaging and pivoting said pivotally mounted blade for pivoting for positively cutting said warp yarns engaged by said hook arm during its rotation.

8. A warp tying machine as claimed in claim 1 in which said machine has a disc rotatably mounted on the bottom of said machine body, an arm on said disc extending upwardly along said body, said yarn drawing hook being mounted on the end of said arm, said yarn hook having yarn grooves thereon for engaging the old warp and the new warp separately for drawing them to the yarn tying means.

9. A warp tying machine as claimed in claim 1 in which said yarn tying means comprises a hook guide cylinder rotatably and slidably mounted on said machine for sliding movement in the direction of its length, means for rotating said cylinder and for moving it back and forth in the direction of its length, a withdrawal hook member within said cylinder and having a hook on the end thereof over which said cylinder is movable, and a guide piece on the end of said cylinder for engaging the warp yarns and wrapping them around the guide cylinder and drawing them into the hook on the end of said hook member during rotation of said cylinder.

10. A warp tying machine as claimed in claim 1 further comprising a clipper on said body along the path of said yarn drawing hook just past said yarn tying means, a yarn end receiving box on said body along the path of said yarn drawing hook just past said clipper, and yarn end disposal means on said box for positively gripping the ends of the warp yarns being tied as they are cut by said clipper and positively delivering them into the yarn end receiving box.

11. A warp tying machine as claimed in claim 10 in which said yarn end disposal means comprises upper and lower grip pawls having interfitting teeth thereon pivotally mounted above said box, means for opening said grip pawls during advancement of the yarn by said yarn drawing hook, and means for positively closing said grip pawls during the action of said clipper while said yarn ends are clipped, and means for opening said grip pawls and pivoting them downwardly toward said box after said slipper has cut the yarns.

12. A warp tying machine as claimed in claim 1 in which said old and new warp yarn gripping means each comprises a clip member and a pressing plate having one end of the clip member pivoted thereto, and fastening means on the other ends of said clip member and said pressing plate and comprising a fastener member and a pair of connecting rods pivoted thereto and having a space therebetween and having the other ends thereof pivoted on said clip member, a clip lever having one end pivotally mounted on said fastener member and having a cam portion adjacent the pivoted end thereof, and a plate spring on the other end of the pressing plate which fits between said connecting rods and against which said cam portion bears when said fastener member is engaged with the end of said pressing plate and said clip lever is pivoted toward and against said plate spring.