JPH03287853A - Method for tufting - Google Patents

Abstract

PURPOSE:To rapidly perform an empty yarn cutting process to heighten a tufting rate by specifying a base web-carrying condition, a needling condition and a tufting machine-stopping condition after the needle is finally inserted into the base web. CONSTITUTION:Just after a looper 11 receives the loop 17C of a pile yarn in the final stitch cycle on the switching of the pile yarn, a base web 13 is carried at a distance longer two times, preferably five times, the tufting density distance S of the pile, and when the needle 14 is passed through the web, the tufting machine is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention mainly relates to a tufting method using a narrow cut pile tufting machine with a small number of needles (hereinafter referred to as a flocking machine).

This type of small-width flocked sewing machine sequentially switches the pile threads 15 at the appropriate time using the needle 140, partially plants the piles on the base fabric 13, and creates a pattern on the base fabric that corresponds to the color of the pile threads. used for.

Even if the flocking sewing machine is wide (tufted I8) with a machine width of several meters, the mechanism of feeding the base fabric at a constant speed and inserting the needle at a constant speed to implant the pile is the same for all flocking machines. .

That is, when the needle inserted into the base fabric reaches the lowest position and starts to rise, the looper crosses the needle while moving forward toward the needle, and the tip 12 of the looper is inserted into the pile yarn loop 17 formed by the needle. (Fig. 2), and when the needle comes out of the base fabric, it starts to retreat, and when the needle comes out of the base fabric and reaches the highest position, and is in a position to be inserted into the base fabric again, the needle is inserted again. Retreat to a position where you can advance towards it.

The looper 11 for cut pile is attached to the base '6 of the tip 412.
The knife 18 is attached facing the conveyance direction (T) of the thread 13 and cooperates with the knife 18 to shear the pile yarn loop 17. When it is in the backward position, it engages with the cutting edge 19 of the looper 11.

These looper 11, needle 14, and knife 18 are usually crank (link) 1! 1, which is driven by the structure and plants one pile 16 per one revolution of the crank.
The stench cycle is repeated.

The pile planting density interval (S) is determined by the moving distance (S) of the base fabric during one stitch cycle. Therefore, in order to maintain a constant pile planting density, the base fabric is conveyed at a required constant speed.

By the way, when the pile yarn loop 17^ taken from the needle 14 is immediately sheared using the looper 11 and the knife 18, the cut end of the pile yarn 15 continuing to the needle 14 slips out from the base fabric 13 and the pile length (L) is becomes uneven. For this reason, the pile yarn loop 17 that has been removed will remain in the looper 11 at least until the end of the next stitch cycle.
It remains locked in place.

Therefore, the Naokiku on which the knife 18 acts is at least 2
Two pile yarn loops 17A for stitch cycles,
17B is locked to the looper 11, and the knife 18 shears the pile yarn loop 17A that has been picked up first (FIG. 3).

Therefore, at the end of the final stitch cycle where the pile is partially planted, at least one pile yarn loop 17 (II) that is not sheared by the looper 11 remains locked, and the pile yarn loop 17C remains locked. Therefore, the base fabric 13 is connected to the looper 11 and cannot move freely.

Therefore, in order to allow the base fabric 13 to move freely, the pile yarn loop 17C fixed to the looper 11 must be
This means that it must be sheared.

In this way, the pile yarn loop 17C that is retained by the looper 11 at the end of the lIk final stitch cycle is generally referred to as a "Heather yarn", and the process of shearing it is referred to as a "Heather yarn cut 1".

[Conventional technology]

In conventional heathered yarn cutting, the transmission device to the needle 14 is separated from the driving crank when it has come out of the base fabric 13, and the looper 11 and knife 18 are cycled several stitches while conveying the base fabric without driving the needle 14. Drive the appropriate amount, and heather yarn (pile yarn loop 17C) together with the base fabric.
) to a position where the looper 11 and knife 18 engage (FIG. 4).

[Problem that the invention seeks to solve]

Therefore, in the conventional method of cutting heathered thread, the first action is to stop the flocking sewing machine once the needle comes out of the base fabric, and the second action is to disconnect the transmission device to the needle from the crank. At least four operations are required: the It operation, a third operation in which only the looper and knife are driven again, and a fourth operation in which the transmission to the needle is reconnected to the crank after the thread force 7.

[Purpose of the invention]

An object of the present invention is to combine the four operations conventionally taken for cutting the heathered threads into one, thereby quickly cutting the heathered threads and increasing the tufting efficiency.

[Structure of the invention]

The present invention was established with such an objective,
Tip of cut pile looper 11: Pile yarn 1 is threaded by needle 14 onto base fabric 13, which is conveyed at a constant speed by a predetermined pile planting density interval (S) in the opposite direction to the protruding direction of ja 12.
In the final stitch cycle when changing the pile thread in a canted pile flocking sewing machine, which repeats the stitch cycle of inserting the needle 14 into the base fabric 13 and forming the cut pile 16, the needle 14 inserted last is inserted deeply into the base fabric 13. 13, preferably from the time when the needle 14 rises and begins to come out of the base fabric 13 to the time when it comes out of the base fabric 13 and reaches the highest position, the pile planting density interval (S) The base fabric 13 is conveyed in the opposite direction to the protruding direction of the tip of the looper at a conveyance speed of at least twice as much, preferably at least five times as much.
The gist of this tufting method is to complete the final stitch cycle and stop the flocking sewing machine without inserting the needle 14 that has come out of the needle into the base fabric again.

A two-position variable speed clutch motor is used as the drive motor for the flocking sewing machine, and one of the two switches is set to stop when the needle reaches its highest position, and the other switch is set to stop when the needle reaches its highest position. It is set so that it stops when it reaches the lowest position or when it starts to come out of the base fabric, and in a normal continuous stitch cycle, that one switch inserts the needle into the base fabric and the needle reaches the lowest position. These two switches are used so that the main flocking machine is stopped by the button, and the other switch is used to stop the flocking machine when the needle comes out of the base fabric in the final stitch cycle when changing the pile thread. It is good to use them properly.

In that case, the means for conveying the base fabric 13 at a speed more than twice the pile planting density interval (S) or the means for separating the base fabric presser from the base fabric 13 in the final stitch cycle are used in the final stitch cycle. It is preferable to configure the drive mechanism so that it can be automatically operated by a switch.

〔Effect of the invention〕

According to the present invention, immediately after the looper 11 receives the pile yarn loop 17C of the final stitch cycle when changing the pile yarn, the base fabric 13 is conveyed in an amount equal to or more than twice the pile planting density interval (S). , when the needle 14 comes out of the base fabric 13 in the final stitch cycle and the looper 11 and knife 18 perform a shearing action, the pile yarn loops 17A, ITB, which are locked to all the loopers including the last pile yarn loop 17C, 17C is looper 11
and knife 18, and by the final shearing action of looper 11 and knife 18 in its final stitch cycle, all those pile yarn loops 17A, 17B.

17C is sheared at the same time to become a cut pile 16, and the end 20, which is the cutting opening of the pile yarn 15 that continues to the needle 14, comes out of the moving base fabric 13, so the base fabric 13 is cut off from both the needle 14 and the looper 11. It is now in a state where it can move freely (Figure 1).

Therefore, the heather thread cutting is performed in two operations: the first operation of stopping the flocking main thread when the needle 14 comes out of the base fabric 13, and the second operation of increasing the conveyance speed of the base fabric immediately before that. However, since the second operation is performed prior to the second operation in which the flocked sewing machine is stopped, the heather thread cutting is completed when the flocked sewing machine is stopped.

As described above, according to the present invention, the movement required for canting the heathered threads is halved compared to the conventional method, and the cuffing of the heathered threads F is completed by the time the flocking sewing machine is stopped, thereby increasing tufting efficiency. .

In this way, the base fabric 13 momentarily moves at high speed just before the end of tufting, and the ends 20 of the canted pile yarns are also biased and aligned in the direction away from the needle 14 by the base fabric 13 moving at high speed. Moreover, the amount of pile yarn supplied from the cone side increases instantaneously as the base fabric 13 moves instantaneously at high speed just before it is cut, and the cut end 20 also becomes longer. This also avoids the inconvenience of the thread bouncing back to the needle side and slipping out of the threading hole 21 of the needle the moment it is cut.

[Embodiments of the invention]

In order to stop the needle at a predetermined position during one stitch cycle, the drive motor of the flocked sewing machine is equipped with a system that can be called a type of computer. A servo motor incorporating a jI element, such as a two-position variable speed crunch motor manufactured by Mitsubishi Electric Corporation (product name: LIMI-3TO)
PZ) etc. is often used, and that system W! The present invention is carried out by increasing the operating speed of the base fabric conveying device (feed roller or base fabric feeding claw) between when the nitrous reaches the lowest position in the final stitch cycle due to the abandonment and when it comes out of the base fabric. You can also do it. In that case, the two stop switches provided on the two-position variable speed craft motor are such that one of them is set so that the needle 14 stops when it comes out of the base fabric 13 high, and the other one is set so that the needle 14 stops when the needle 14 comes out of the base fabric 13 high. The needles 14 are set so that they stop when they are inserted deeply into the cloth 13.

The feeding speed of the base fabric is not automatically controlled, but the flocking sewing machine is manually stopped once the needle reaches its lowest position.
It is also possible to carry out the present invention by strongly pulling the base fabric in the conveyance direction to increase the conveyance speed of the base fabric, driving the flocking pattern, and stopping the needle when it comes out of the base fabric.

In that case, the number of movements will increase compared to when the conveyance speed of the base fabric is automatically controlled, but in the conventional method, the flocking main machine is stopped for a moment just before the final stitch cycle, and the driving The needle is inserted into the base fabric, or
The stitches are gradually driven to complete the final stitch cycle while visually confirming whether they have come out, and then the needle transmission device is disconnected and connected, and only the looper and knife are driven.

In this respect, the present invention is more efficient than the conventional method because it eliminates the disconnecting and connecting operations of the needle transmission device and the driving operations of the looper knife, which are performed after the final stitch cycle is completed.

As described above, the present invention is advantageous for cutting the heathered yarn of a narrow-width flocked sewing machine where pile yarns are frequently changed.

[Brief explanation of the drawing]

Fig. 1 is a side view of the main part near the looper of the flocked sewing machine when cutting the heathered thread according to the present invention, Fig. 2 is a side view of the main part near the looper of the flocked sewing machine when receiving the pile thread loop, and Fig. 3 is the continuous operation. FIG. 4 is a side view of the main part of the looper 4 of the flocked sewing machine when shearing the pile yarn loop in the process, and FIG. 11... Looper, 12... Tip, 13...
Base fabric, 14... Needle, 15... Pile yarn, 16
... Cant pile, 17... Pile yarn loop,
18... Knife, 19... Cuffing edge, 20... Terminal, 21... Thread hole, S...
Density interval, T...conveyance direction, L...pile length.

Claims (1)

[Claims] A cut pile 16 is formed by inserting the pile yarn 15 with a needle 14 into the base fabric 13 which is conveyed at a constant speed by a predetermined pile planting density interval (S) in the opposite direction to the protruding direction of the tip 12 of the cut pile looper 11. In the final stitch cycle when changing the pile thread in a cut pile flocked sewing machine that repeats the stitch cycle, the needle 14 inserted last rises and starts to come out of the base fabric 13, and then it comes out of the base fabric 13 and reaches the highest position. Until reaching this point, the base fabric 13 is conveyed in the opposite direction to the protruding direction of the tip of the looper at a conveyance speed that is at least 5 times the pile planting density interval (S), and the needle that has come out of the base fabric 13 is A tufting method characterized in that the final stitch cycle is completed and the flocked sewing machine is stopped without inserting the tufting machine 14 into the base fabric again.