JPS6148956B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a double chainstitch sewing machine using a vertical swing looper that enables the sewing width to be minimized.

(Prior art) Conventionally, a double chainstitch sewing machine using a vertical swing looper, which can form a double chainstitch on a sewing product by a series of operations of a needle, a vertical swing looper, and a spretzer (crochet needle), There is a limit to which the needle width can be minimized, and the problem is that it cannot be used for sewing products with a needle width smaller than this limit, for example, for forming two stitches on each of multiple lines provided on the collar of a sailor uniform. Also, there was a problem in that it was not possible to make the sewing width narrower than the current sewing width for pin-tuck decorative stitches, etc., which are the applications of this type of sewing machine.

In other words, in conventional sewing machines of this type, the distance between the sewing machine needles and the distance between the needle holes in the presser foot and throat plate can be relatively easily narrowed, but the looper moves the tip of the needle forward from the tip of the solid shaft. It has a substantially inverted dogleg-shaped configuration formed integrally, and the base side of the shaft is inserted into the mounting hole b of the common looper holder a, as shown in FIG. It has a structure in which the looper e is embedded and fixed in the looper holder a by screwing a set screw d into the hole c, and in order to obtain support strength, it must be fixed with a set screw d that is equal to or thicker than the looper shaft. Therefore, in order to arrange and fix such loopers side by side in a row in the horizontal direction with an extremely small width between the tip looper needles, first, the wall thickness of the tip looper needles must be made small, and this alone is not enough. Since it is not possible to narrow the distance between the needles of the tip looper, the distance between the needles of the tip looper can be narrowed by making the diameter of the looper shaft smaller. It becomes weaker. As a result, industrial sewing machines that operate at high speed and have a large driving force have deteriorated strength, safety, and reliability, making them impractical for practical use. In other words, the minimum distance between the tip end looper needles is determined by the thickness of the looper shaft, and furthermore, the distance has a limit to which it can be minimized for the above-mentioned reasons.

Second, double chainstitch sewing machines that use a vertical swing looper use a spreader to form a double chainstitch on the sewn product, but conventionally known spreaders have one shaft of the spreader that corresponds to each needle. The part penetrates the spretsuda shaft rod and is fixed via a set screw,
In order to respond to the minimization of the needle width, the thickness of the shaft must be made thinner, which again poses a problem with the strength of use, and it is not possible to narrow the spacing between the sprets to the current minimum width. I had a problem.

Therefore, in the past, when forming two stitches in each of the multiple narrow lines provided on a sailor suit, or when making decorative stitches with many pintucks of very small width, two stitches were required. By doing so, the extremely small sewing width was obtained.

As a result, the versatility and possibilities of sewing that could be obtained by making the sewing width even narrower than the current one is blocked, and it takes time and effort to obtain such a sewing width, which hinders the development of sewn products. It also became a hindrance.

(Object of the Invention) The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a vertical swing looper that can achieve an extremely small sewing width in a single stitch, which has not been possible until now. An object of the present invention is to provide a double chainstitch sewing machine using the.

(Structure of the invention) A looper group consisting of at least two loopers,
At least one group is disposed on the looper support member, and the looper group has a cube-shaped base having a width greater than the wall thickness of the tip end of the looper needle, and is fitted and fixed to the looper support member via a set screw. It is formed rising from the base, and in order to make the rising position of the tip looper needle close to the other tip looper needle,
Different types of loopers are arranged side by side, and a spreader plate in which a spreader corresponding to such a group of loopers is cut out in a single metal plate is attached to a spreader holder, and a presser foot and a cloth presser corresponding to such a group of loopers are attached. A double chainstitch sewing machine that uses a vertical looper with a needle hole in the throat plate.

(Function) With this technical means, each looper can be placed in an extremely small sewing width, which could not be done conventionally, without reducing the usable strength. Each spreader can be arranged in the sewing width without reducing the usable strength, and a double chain stitch with an extremely small width can be formed on the sewn product.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a perspective view showing a sewing section of a double chainstitch sewing machine using a vertical swing looper.

1 in the figure shows a pair of extremely small width sewing machine needles 2, 2 as one group, and a plurality of groups (six groups in this example) attached to the needle stock provided at the tip of the needle bar 3 at appropriate intervals (in this example, at regular intervals). ) is the complete group of sewing machine needles attached to the machine. To fix the plurality of sets of sewing machine needles 2, 2 on the needle stock 4, insert the bases of the sewing machine needles 2, 2 into mounting holes (not shown) on the lower surface of the needle stock 4, and then Each sewing machine needle 2 is fixed to a screw hole (not shown) on the front surface through a screw 5. In addition, the threaded hole of the needle stock 4 is moved up and down, and the larger diameter screw 5
..., so that the sewing machine needles 2, 2 of each group can be firmly fixed to the needle stock 4 with the minimum needle width.

Reference numeral 6 in the figure denotes a presser foot having needle holes 6a formed therein corresponding to the sewing machine needle group 1.

In the figure, reference numeral 7 denotes a needle that is mounted on the bed (not shown) of the sewing machine main body, and has a needle hole (not shown) corresponding to the sewing machine needle group 1 and a through hole 7a in which the feed dog 8 is arranged on its plane. It is a board.

Reference numeral 9 in the figure indicates a looper group in which a plurality of looper groups A (six in this embodiment) each consisting of two loopers 10 and 11 are provided at predetermined intervals in correspondence with the sewing machine needle group 1. As shown in FIGS. 1 and 2, this looper group 9 has six looper support members 13 fixedly attached to a looper holder 14 connected to a drive mechanism (not shown), and these looper support members 13...
Looper group A is attached to each.

The looper group A consists of two loopers 10 and 11, and as shown in FIG. It consists of cubic bases 10b, 11b that are larger than the thickness, and rising edges 10c, 11d that connect the tip looper needles 10a, 11a and the bases 10b, 11b.
When the loopers 10 and 11 are arranged in parallel, the distance between the tip looper needle portions 10a and 11a is set to be the width of the minimum width sewing machine needles 2 and 2.

That is, the left looper 10 is provided with a rising portion 10c rising from one side of the base 10b, and a distal end looper needle portion 10a is provided forward from the tip of this rising portion 10c.
These two are provided with a rising portion 11c rising from the side of the base portion 11a on the side opposite to the left rising portion 10c, and a tip looper needle portion 11a is provided forward from the tip of this rising portion 11c. When the two loopers 10 and 11 are arranged in parallel, the distance between the left and right tip end looper needle portions 10a and 11a becomes a small distance.

In addition, the base portions 10b and 11 of each looper 10 and 11
Fitting recesses 10d and 11d are provided on the back surface of b, and the fitting convex portion 13a provided on the upper surface of the looper support member 13 is fitted, and the set screw 12 is inserted into the base 1.
Each looper 10, 11 can be fitted and fixed to the looper support member 13 by screwing into a screw hole 13b on the looper support member 13 through the holes 10d, 11d of the loopers 0b, 11b.

The looper holder 14 has a rotation shaft insertion hole 14a at the lower end, and a shaft insertion hole 1 at the front surface of the lower end.
4b, and a shaft (not shown) connected to a drive mechanism is inserted into this shaft insertion hole 14b,
The looper group 9 is designed to swing vertically in the front and rear directions around a rotation axis (not shown) as shown in FIG.

Furthermore, a fitting protrusion 14d is provided at the center of the looper holder 14 in which a long hole 14c is bored along the length direction of the looper holder 14.

Then, the fitting protrusion 14d of the looper holder 14 is fitted into the fitting recess 13b provided on the back side of the looper support member 13, and the screw 30 is inserted into the screw hole 13c of the looper support member 13 and the long hole 14c of the looper holder 14. The looper support member 13 can be fixed to the looper holder 14 at any position by inserting the looper support member 13 into the looper holder 14 and screwing it into the slideable seat 31 which fits into the elongated hole 14c of the looper holder 14 from the back side and is slidable.

In the figure, reference numeral 16 denotes a spreader group that works in conjunction with the sewing machine needle group 1 and the looper group 9 to form a double chainstitch on the sewing material. This Spretsuda group 16 is
As shown in FIGS. 3 to 5, the two spretzers 18 with an extremely small interval corresponding to each looper group A of the total looper group 9 are referred to as a spretzer group B, and this spretzer group B consists of two pieces. metal plate 1
7 and 17, and these two metal plates 1
7 and 17 are fixed to the spreader holder 19 via screws 40.

The spreader holder 19 has a concave groove 19a formed on its lower surface to support a shaft 20 connected to a drive mechanism, and has through holes 19b, 19b penetrating back and forth at the left and right ends of the spreader holder 19.
Through hole 20 of shaft 20 that matches b, 19b
a, 20a, and screw into screw holes 22, which are carved at different angles on the upper surface of the left and right ends of the spretzer holder 19 and look into the shaft 20. It is fixed by pushing itself up against the shaft 20.

In this way, the double chainstitch sewing machine of this embodiment has the loopers 10 and 11 connected to the tip looper needle parts 10a and 11.
The base portions 10b, 11b and the looper support member 13 have a width and thickness larger than the width and thickness of a.
b is fixed via the set screw 12, the supporting strength of the tip looper needle portions 10a, 11a can be increased, and it is possible to cope with high-speed vertical swinging motion.

Furthermore, the looper group A includes two loopers 10 and 11.
Since the distal end looper needle parts 10a, 11a are provided from the opposing sides of the respective base parts 10b, 11b via the rising parts 10c, 11c, the distance between the distal end looper needle parts 10a, 11a can be minimized. It is possible to

Further, each spreader group B... is connected to each metal plate 17,
Since the metal plates 17, 17 are integrally provided in the spreader holder 19, it is easy to process even if the distance between the spreaders 18, 18 is very narrow, and the strength for use is sufficiently strong.
Assembling is easy because the entire group of spreaders 16 can be formed by simply fixing the parts to the parts.

In the above embodiment, the fitting recesses 10d and 11d are provided on the looper 10 and 11 sides, and the fitting protrusion 13a is provided on the looper support member B side, and these are fitted together and screwed together. Although described above, the present invention is not limited to this, but may include providing a fitting convex portion on the looper 10, 11 side, providing a fitting recess on the looper support member 13 side,
They may be configured to be fitted together and screwed together.

Further, in the above embodiment, the sewing machine needle group 1 is
Two sewing machine needles 2, 2 with extremely small width are grouped together,
Although six groups are provided at regular intervals and the corresponding looper groups 9 and spreader groups 16 have been described, the present invention is not limited to this. The looper total group 9 and the spreader total group 16 may also correspond to the above.

Further, the total looper group 9 may be composed of one looper group A, or may be composed of a plurality of looper groups A to the extent possible.

Further, in the above embodiment, the looper group A has been described in which two loopers 10 and 11 are arranged side by side to minimize the width, but the number of loopers is 2 or more, 3, or 4. For example, in the case of 4 pieces,
As shown in FIG. 6, each looper 81, 82, 8
3,84 in a parallel state, each tip looper needle part 81
a, 82a, 83a, 84a at a predetermined fine interval, the tip looper needle parts 81a, 82
a, 83a, 84a and base portions 81b, 82b, 83
Rising portions 81c and 82 connecting b and 84b
c, 83c, and 84c may be made to have different configurations and used for decorative stitching with pin-tucks at extremely fine intervals. In this case, the four loopers 81, 82, 83, 84 may be fitted and fixed to the looper support member 13 all at once, or
It may be fitted and fixed across the two looper support members 13, 13.

In addition, the metal plates 17, 17 of the above embodiment include:
Although three groups of spreader group B, each consisting of two spreaders 18, 18, are shown,
The present invention is not limited to this, and one spreader group B may be integrally provided on one metal plate.

(Effects) As explained above, the double chainstitch sewing machine using the vertical swing looper of the present invention can be arranged at an extremely narrow looper interval, which was previously impossible, and the spretsher can also be arranged to accommodate the looper interval. Since they can be arranged at intervals, it is possible to form a double chain stitch with an extremely small width on a sewn product, which was previously impossible. Furthermore, even though the looper spacing and the spreader spacing are extremely small, the strength of use thereof is strong enough to withstand practical use.

Therefore, for example, it is possible to simultaneously form two double chain stitches on each of a plurality of lines provided on the collar of a sailor uniform, and it is also possible to perform narrow pin-tuck decorative stitches.

As described above, the present invention has great practicality as it can contribute to the development of sewn products that could not be done or required time and effort in the past by making it possible to sew a very small width.

[Brief explanation of the drawing]

Figures 1 to 5 show one embodiment of the present invention, with Figure 1 being a perspective view showing only the sewing part, Figure 2 being an exploded perspective view, Figure 3 being an exploded perspective view, and Figure 4 being a simplified view. FIG. 5 is a side view, FIG. 5 is a simplified plan view, FIG. 6 is a plan view showing essential parts of another embodiment of the present invention, and FIG. 7 is a simplified perspective view showing a conventional looper. A...Lupa group, 10, 11...Lupa, 10
a, 11a...Tip looper needle part, 10b, 11b
...Base, 10c, 11c...Connection part, 13...
Looper support member, 14...Looper holder, B...
Spretsuda group, 17... Metal plate, 18... Spretsuda, 19... Spretsuda holder.

Claims (1)

[Scope of Claims] 1. At least one group of loopers consisting of at least two loopers is arranged on a looper support member, and this looper group has a tip looper needle portion shaped into a cube having a width greater than the wall thickness of the looper group. The looper support member is formed to rise up from the base which is fitted and fixed to the looper support member via a set screw, and in order to bring the rising position of the distal end looper needle close to the distal end looper needle of the other party,
A spretsuda plate with cutouts formed in a single metal plate is attached to a spretsuda holder, and a presser foot and a needle corresponding to these loopers are attached to the spretsuda holder. A double chainstitch sewing machine using a vertical looper characterized by having needle holes formed in the plate.