US3879824A

US3879824A - Warp tying machine

Info

Publication number: US3879824A
Application number: US424310A
Authority: US
Inventors: Kazuo Mizuno
Original assignee: Individual
Current assignee: Individual
Priority date: 1973-01-24
Filing date: 1973-12-13
Publication date: 1975-04-29
Anticipated expiration: 1992-04-29

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

United States Patent 1191 Mizuno Apr. 29, 1975 i 1 WARP TYING MACHINE [76] Inventor: Kazuo Mizuno, 3-17-2 Mikasadori, Kasamatsu-cho, Hashima-gun, Gifu Prefecture, Japan [22] Filed: Dec. 13, 1973 [2]] Appl. No: 424,310

Primary E.run1iner Louis K. Rimrodt Attorney. Agent. or Firm-Wenderoth. Lind & Ponack [57] 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.

12 Claims, 37 Drawing Figures Pf-IENTEB APR 2 9 i975 SHEET UlUF 28 FIG.1

PHENTEDAPMQBB ,579, 24

sum 02 [1F 28 FIG.2

SHEET O3UF 28 FIG.3

SHEET OSUF 28 FIG .5

FIG.6

PMENTEMmzsms SEEET 08 0F 28 FIG.9-

PATENTEBAPRZSIQTS 1,879,824"

saw near 28 'FIG.11

Claims

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.