SU755908A1 - Device for making rug knot on rug loom - Google Patents

Description

The invention relates to textile machinery, in particular, to the design of the device for the formation of a carpet knot on. carpet weaving machine.

A device for the formation of a carpet knot on a carpet weaving machine is known, which comprises a pile thread feeding mechanism, scissors and knotting | mechanism with knotted levers, made with lamellar horns with eyes at the ends and installed with the possibility of reciprocal and oscillatory motion [1]. '

The disadvantage of the device for the formation of a carpet knot is the poor quality of the pile-up with a weak puff of the knots and an uneven height of 2 ends, which is a consequence of the free position of the length of the pile thread in the eyes in the process of weaving. In this case, in order to obtain a guaranteed pile height, it is necessary to specify obviously elongated segments of the pile thread, which leads to its overrun. The disadvantages of the device also include the complexity of the node mechanism with 3

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reciprocating and oscillating movements, which leads to a limitation of its performance.

It is also known a device for the formation of a carpet knot on a carpet weaving machine containing feed mechanisms and pile yarn sections and knotting mechanisms located on a carriage, including knotting levers and needle guides with eyes for a pile thread [2].

The disadvantage of the device lies in the fact that it cannot ensure the formation of a double pile knot with a forceful tightening, because in the process of forming the knot, the knotting mechanism carries the free ends of the pile thread between the two warp threads without the force needed for tightening, due to the fact that the threads are held by a stream of air. A jet of air can accompany the eye of the guide needle only up to the plane of the warp threads from the rear. The needle eye at the time of the passage of the plane of the warp threads and further cannot create the necessary force to tighten the knot and serves only for the arbitrary formation of a double nap knot. Of3

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> a "committing the reciprocating mechanism of reciprocating motion, its speed limit is quite low.

The purpose of the invention is to improve the quality of the carpet and device performance.

This goal is achieved by the fact that each knotter mechanism includes two hollow disks mounted coaxially with the possibility of rotation, the inner of which is made with radial grooves, and the knotting levers are placed along the perimeter of the outer disk and have ν-shaped heads with slots in the walls, each guide needle has a heel placed in the groove of the inner disk and in contact with the outer disk by means of a spring-loaded lever placed on it, and the needle stem is installed in the slot of the heat exchanger p Chaga.

In addition, the disks are connected to a carriage drive by means of a Maltese mechanism with two crosses interconnected by an elastic element.

FIG. 1 shows the kinematic diagram of the device for the formation of a carpet knot; in fig. 2 is a knotted mechanism, 'in FIG. 3 is a view A of FIG. 2) in FIG. 4 shows a section BB in FIG. 2, 'in FIG. 5 - Geneva mechanism diagram ^- Fig. 6 - knotting process / in FIG. 7 is a cycle diagram of the operation of the main mechanisms of the device.

The device for the formation of a carpet unit contains placed on the carriage 1 feed mechanisms 2 and cutting 3 pile threads and knotting mechanisms 4. Carriage 1 is connected with the lead screw 5 of the loom and has the ability to move to form a horizontal row of pile nodes. Each knotted mechanism 4 includes two hollow discs 6 and 7, which are mounted coaxially with the option. rotation around the axis 8. The disks are rigidly connected with the gear wheel, themselves 9 and 10, interacting with the gears 11 and 1'2 of the Maltese mechanisms. The Maltese mechanism contains cranks 14 and 15 with fingers 16 and a pair of crosses 17 and 18 fixed on the camshaft of the drive of the carriage 13 and connected by an elastic element 19. The cranks have two cylindrical locking surfaces 20 and 21, one of which 20 is partially made with incomplete profile.

Along the perimeter of the outer disc 6, four knotted arms 22, having ν-shaped heads 23 with slots in the walls, are fixed in the slots, while the rods are located in the slots

24 guiding needles with eyes 25 for pile threads 26.

The inner disk 7 is made with radial grooves 27, in which the heels 28 of the guide needles 24 are placed. The heels of the needles are in contact with the outer disk 6 by means of a lever 30 placed on it by a spring-loaded spring 29.

The tuft yarn feed mechanism 2 comprises a thrust 31 with a toothed rack, a return spring 32, a yarn feeder 33 mounted on an axis 34, a spool 35 with a nap thread 26 and a pusher 36 having a kinematic connection with the cam 37 on the camshaft 13.

The mechanism 3 cutting contains a circular knife 38 mounted on the shaft of the electric motor 39, the position of which is determined by the cam 40 on the camshaft 13.

The lead screw 5 is connected to the camshaft 13 by means of a gear train 41 and 42, while the lead screw 5 has a longitudinal groove for the keyway of the gear.

The device works as follows.

When the spindle 5 rotates from the machine drive, the carriage 1 moves and the camshaft 13 rotates, which, rotating the cranks 14 and 15 of the Maltese mechanism, transmits movement to the disks 6 and 7. By rotating the outer disk 6, one of the knotted arms 22 is inserted between the two warp threads , and at the time of the return stroke (after the finger 16 leaves the slots of the crosses), the ν-shaped head selects two warp threads and lifts them. Rotation of the inner disk 7 in the opposite directions (after the finger 16 leaves the slots of the crosses 17 and 18), the inner disk 7 interacts with the heels, pushing the needles forward.

Thus, during the pause, the needles are set to the filling position with a tuft thread 26. At this time, under the action of the cam 37, the pusher 36 moves the thrust 31, the rack which interacts with the toothed sector of the yarn feeder 33, turning it around the axis 34 and turning the nose of the yarn feeder 33 with pile thread 26 in the holes of the needles. At the first reverse movement, the yarn feeder 33, at the moment of transition of the cylindrical surface from the incomplete to full profile of the crank 15, one of the needles (right) grabs the end of the pile thread and pinches it in the groove of the head 23. The tightening of the needle is provided by the lever 30 under the action of the spring 29.

Levers 30 with springs 29 way-.

advance the capture of the end of the thief5

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owl thread 26 one of the needles. Sequential capture needles pile thread 26 allows you to create a loop of the pile thread 26 of the required length movement of the yarn feeder 33, created by the profile of the cam 37. Thread guide 33 in accordance with the profile of the cam 37 moves back a little, creating a supply of pile thread of the required length and again goes forward into the hole of the remaining needle . At this point, the gap between the wall of the disk and the heel of the second needle is selected, and the yarn guide moves in the opposite direction. The needle intercepts the pile thread and pinches the second head.

The yarn guide 33 somewhat moves away from the needles, creating a supply of thread, which is necessary for the needle to grip when a subsequent knot is formed. A rotating circular knife 38 is fed under the action of the cam 40 and the pile thread 26 is cut off.

During the period of rotation of the crosses of the Maltese mechanisms, the disks 6 and 7 are rotated by 90 °, shifting the loaded lever 22 from the refueling position to the unloading position. During the translation, the ends of the pile thread are stretched out from the gaps with the formation of a double carpet pile knot on two warp threads. At the same time, the ends of the pile assembly are clamped in the slots of the heads by 23 needles, and under the action of the tension of the warp threads, the formed assembly is tightened. The release of the ends of the formed knot occurs at the moment of the needles being extended for the subsequent loop formation cycle.

Placement of four knotted levers 22 on the knotter mechanism is necessary to ensure a complete cycle of the process of rolling out the levers by 90 °, as well as to align the needles from the head of the next filled knotter 22 with the release of the ends of the knot in the previous lever.

When using the invention, a high quality of the carpet knot is provided, like a manual one, and therefore a high quality of the pile carpet of the carpet, when performing the carpet knot with the forced wiring of the nap yarn and its forceful tightening. In addition, the installation of the node mechanism with the possibility of rotational movement allows you to increase the speed capabilities of the device.

Claims (2)

Claim 1. Device for the formation of a carpet knot on a carpet weaving machine containing feed mechanisms and sections of the pile nini and knotting mechanisms placed on the carriage, including knotting levers and guide needles with eyes for a pile thread, characterized in that in order to improve the quality of the carpet and the performance of the device , each ulyazalny mechanism includes two hollow disks mounted coaxially with the possibility of rotation, the inner of which is made with radial grooves, and the knotted levers are placed along ne The outer disk has an outer disk and has ν-shaped heads with slots in the walls, with each guide needle having a heel placed in the groove of the inner disk and in contact with the outer disk by means of a spring-loaded lever placed on it, and the needle shaft is installed in the slot of the knotting lever. 2. Device by π. 1, characterized in that the disks are connected to a carriage drive by means of a Maltese mechanism with two crosses interconnected by an elastic element.