JPS6219538B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tufting machine that forms piles by tufting with two rows of needles and one row of loopers.

Conventionally, tufting machines have used needle bars arranged in two rows in a staggered manner (referred to as staggered needle bars) and two corresponding rows of loopers to create piles with staggered stitches, as shown in Figure 10. It was known that it could be obtained.

The staggered stitch refers to a stitch in which adjacent piles obtained with the staggered needle bar are not lined up in a row in the longitudinal direction of the needle bar, but are offset from each other, as illustrated in FIGS. 5 and 6. On the other hand, stitches lined up in a row as illustrated in FIGS. 7 and 8 are called parallel stitches. or,
In addition to this, stitches obtained using a straight needle are also called parallel stitches.

The pile of staggered stitch has the following features compared to parallel stitch. That is, there is little damage to the base fabric due to tufting, and the horizontal steps that occur during tufting are less noticeable. In addition, in the case of the same basis weight, the piles are dispersed, the surface coverage is good, and pile cracking is less likely to occur. In particular, it has the advantage that pile cracking is less likely to occur in low-coverage products, molded carpets for automobiles with many irregularities, and carpets for stages that are frequently folded. Also, unlike parallel stitches, diagonal rows of piles are visible, giving it a unique appearance.

Conventionally, in order to obtain the above-mentioned staggered stitch, a staggered needle bar as illustrated in FIG. 9 and FIG. It consists of a plurality of needles 9' and a needle bar 8 that supports them.

Here, the distance A in the front-back direction between the rear needle row and the front needle row is normally 6.35 mm (1/4 inch), and the corresponding loopers are a looper 10 with a short tip and a looper 10 with a long tip. ' is 1
Every other book is fixed to the looper block 11.

However, in the case of the conventional type tufting machine mentioned above, in order to switch from staggered stitch to parallel stitch, the staggered needle bar is changed to a straight needle bar (needle is lined up in one row). It was also necessary to replace the . Conversely, when switching from a straight needle bar to a staggered needle bar, it was necessary to replace the looper or looper block in addition to the needle bar as described above.

The purpose of the present invention is to eliminate the drawbacks of the conventional staggered tufting machine described above, and the advantage of the present invention is that the spacing A between the two rows of conventional staggered needles is 6.35 mm (1/4 inch). By changing the above and combining it with one uniform row of loopers, the same one row of loopers can be used for both staggered needles and straight needles, eliminating the need to replace the loopers, reducing the switching time mentioned above. The point is that it has been shortened to a large width.

The configuration of the present invention will be explained.

As shown in FIG.
That is, it has a plurality of needles 2' in the front row and a needle bar 1 supporting them, and the loopers 3 corresponding to the two rows of needles are arranged in the first row.
As shown in FIG. 4, they are arranged in a uniform shape in one row. The relationship between the looper and the needle is such that one looper corresponds to one needle.

At this time, the distance A between the front and back row needles is 0.79.
It is set between mm (1/32 inch) and 3.18 mm (1/8 inch) and combines two rows of needles and one row of loopers.

If A is 3.18 mm (1/8 inch) or more, the difference in the relative positional relationship of the looper to the needles in the front and rear rows becomes large, making it difficult to scoop the looper, and thread breakage is likely to occur. On the other hand, if the spacing A is less than 0.79 mm (1/32 inch), the tufted piles will hardly line up in a single row and will not form a zigzag stitch, which will reduce the effectiveness of the zigzag stitch.

Examples are shown below.

Gauge is 1/8 inch, stitches are 31/10cm,
The pile is cut, the pile length is 7.5 mm, the pile thread is PP filament 1,000 d x 2, the base fabric is PP typer (DuPont Spunbond), and the back side is coated with polyethylene using the hot melt method. The distance A between the front and rear needles was 1.59 mm (1/16 inch), and the loopers were uniformly arranged in a row as shown in Figures 1 and 4. A staggered stitch carpet was obtained with almost no problems such as thread breakage during tufting.

As an effect of the present invention, since a single row of looper 3 is used to switch between zigzag stitch and parallel stitch,
It was only necessary to change the needle bar (ie, from a straight needle bar to a staggered needle bar, or vice versa), saving labor and time.

In addition, in order to obtain a staggered pile, the distance A between the stitches and the front and rear needles must have a certain relationship (described later), and it becomes necessary to change the distance A depending on the stitch. It has become easier to replace needle bars with different A.

Here, as mentioned above, the appearance of the zigzag stitch and parallel stitch is determined by the stitch and the interval A, which will be explained using the following example.

FIGS. 5 and 6 are examples of zigzag stitches.

A: Needle spacing between front and back rows (mm) S: Length of one stitch (mm) Assuming that, Fig. 5 shows the state where A = 1/2S, and Fig. 6 shows the state where A = 3/2S.
This is a model representation of the situation.

When it comes to zigzag stitches, one of the relationships below generally apply.

A=1/2S, 1+1/2S, ..., (n+1/2)
S (n is a natural number) Also, Fig. 7 and Fig. 8 are examples of parallel stitches, but Fig. 7 shows the state of A=S, and Fig. 8 shows the state of A=2・S.
This is a model representation of the situation.

Parallel stitches generally have one of the following relationships.

A=1・S, 2・S, ..., n・s (n is a natural number) The above example is an example of cut pile, but loop pile is also a type that controls the pile length such as high and low. It can also be used for

In addition, with a conventional A=6.35 mm (1/4 inch) needle, the number of stitches that would be zigzag stitches would be 23.6 stitches/10 cm for the practical range of 20 to 60 stitches/10 cm, and 39.4 stitches/10 cm.
10cm, 55.2 lines/10cm, but A=
1.59 mm (1/16 inch) means 31 stitches/10 cm, and zigzag stitches are now possible in stitches that were previously impossible.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention. FIG. 1 is a side sectional view of a tufting machine according to an embodiment of the present invention, FIG. 2 is a side view of a needle bar according to an embodiment of the present invention, FIG. 3 is a partial plan view of a needle bar according to an embodiment of the present invention, and FIG. The figure is a partial sectional view showing a needle, a looper, and a knife according to an embodiment of the present invention. Fifth
The figure is a model diagram of a zigzag stitch when A=1/2S (A: needle spacing (mm), S=stitch length (mm)). The piles connected by solid lines are tufted at the same time. (The same applies to FIGS. 6 to 8) FIG. 6 is a model diagram of the zigzag stitch when A=(1+1/2)S. FIG. 7 is a model diagram of parallel stitching when A=S. FIG. 8 is a model diagram of parallel stitching when A=2S. FIG. 9 is a side sectional view of a conventional tufting machine, and FIG. 10 is a partial plan view of a conventional needle bar. 1... Needle bar, 2... Needle (back row), 2'... Needle (front row), 3... Looper, 4... Looper block, 5... Knife, 6
... Knife block, 7 ... Needle hole (back row), 7' ... Needle hole (front row), 8 ... Needle bar, 9 ... Needle (back row), 9' ... Needle (front row), 10 ... Looper (back row), 10'...
...Looper (front row), 11...Looper block, 12...Knife, 13...Knife block,
14... Needle hole (back row), 14'... Needle hole (front row).

Claims (1)

[Scope of Claims] 1 (1) The needle has two parts in the front and back as shown in FIG.
The needles are arranged in a staggered row, and the horizontal distance B between adjacent needles is constant; (2) the loopers corresponding to the two rows of needles are uniformly arranged in a row; (3) one needle A tufting machine characterized by one looper corresponding to one needle. 2. The tufting machine according to claim 1, wherein the distance A between the two rows of needles is 0.79 mm (1/32 inch) to 3.18 mm (1/8 inch).