JPH0215239B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a lockstitch sewing machine equipped with a shuttle, such as a quilting machine that continuously sews quilted fabric, or an embroidery machine that embroiders the fabric.

(Prior Art) Conventionally, as shown in FIGS. 5 and 6, for example, a quilting machine that continuously sews quilt fabric has a passage 11 in which an upper needle that supplies upper thread to a side surface 10a moves up and down. a sewing table 10 having a needle thread, a shuttle holder 2 having a shuttle holder 21 holding a shuttle for supplying a bobbin thread, and a pin 22.
0 is known (Jikko 55-
No. 44619).

In this case, by moving the upper needle 1 up and down as shown in FIGS. 7 to 9, a loop of the upper thread 2 is formed under the quilt fabric, and as shown in FIGS. 10 and 11. By reciprocating the shuttle 30 along the side surface 10a of the sewing table 10, the loop of the needle thread 2 and the bobbin thread 3 in the shuttle 30 are entangled, and the quilt fabric is sewn. There is.

However, for such conventional configurations,
As shown in FIG. 12, the sewing table 10 and the sewing table 10
A shuttle 30 that reciprocates along the side surface 10a of
Since a gap 50 is created between the two, the following problem occurred.

(Problems to be Solved by the Invention) In other words, due to the gap, the shuttle and the upper needle cannot be kept close to each other, and the shuttle does not pass through the loop of the upper thread formed by the vertical movement of the upper needle. There was a problem that the upper thread and lower thread were not entangled, resulting in a so-called skipped stitch phenomenon.

Furthermore, since the shuttle reciprocates at high speed, if there is a misalignment in the passage of the shuttle through which the bobbin thread is passed relative to the loop of the upper thread, the loop will expand when the shuttle passes through the center of the loop of the upper thread. There was a problem in that the force that was trying to expand to a greater extent than that of the upper thread would momentarily tighten the upper thread strongly, causing the thread to break.

The present invention was made in view of the above circumstances, and provides a shuttle that can prevent so-called skipped stitches and thread breakage by reliably intertwining the upper thread and lower thread during sewing. The present invention aims to provide a lockstitch sewing machine equipped with the following functions.

(Means for Solving the Problems) That is, a lockstitch sewing machine equipped with a shuttle according to the present invention includes a sewing table made of a non-magnetic material and having a passageway through which the upper needle moves up and down on the side surface, and the sewing table. a shuttle holder configured to reciprocate the shuttle along the side surface of the sewing table, and a shuttle holder is provided adjacent to the upper needle passage of the sewing table, and the shuttle is sucked toward the front side of the sewing table in the forward direction of the shuttle. It is characterized in that it is provided with a magnetic member.

(Operation of the invention) As a result, the shuttle that supplies the bobbin thread is drawn to the sewing table in the path in which the upper needle of the sewing table moves up and down, and the shuttle is passed through the loop of the upper thread.
The upper thread and the lower thread can be reliably entwined, and skipped stitches and thread breakage can be prevented.

(Example) The present invention will be specifically described below with reference to an example shown in the drawings, taking a quilting machine as an example.

FIG. 1 shows an embodiment of the present invention, in which a side surface 10a
Sewing table 10 having a passage 11 through which the upper needle moves up and down.
and a shuttle holder 20 for reciprocating the shuttle along the side surface 10a of the sewing table 10.

The sewing table 10 is made entirely of non-magnetic material, such as non-magnetic steel containing manganese, chromium, nickel, etc., or non-metallic material such as resin, ceramics, etc., which does not exhibit magnetism. In the sewing table 10 made of such a non-magnetic material, as shown in FIG. A magnetic member 12 made of a columnar magnet or the like is embedded. On the other hand, the shuttle holder 21 and pin 22 of the shuttle holder 20
The shuttle 30 held by the magnetic member 12 is made of a metal material or the like that is attracted to the magnetic member 12.

Therefore, when sewing quilt fabric,
As shown in FIGS. 2 and 3, a shuttle 30 reciprocates along the side surface 10a of the sewing table 10.
When the upper needle 1 of the sewing table 10 attempts to pass through the passage 11 in which it moves up and down, it is drawn to the sewing table 10 by the suction action of the magnetic member 12, and the upper needle 1 is thereby formed by the vertical movement of the upper needle 1. The tip of the shuttle 30 can be reliably guided to the loop of the upper thread 2, and the upper thread and lower thread can be entangled.

Further, the attraction effect of the magnetic member 12 does not work on the shuttle 30 except in the vicinity of the passage 11 of the sewing table 10, so that the shuttle 30 can smoothly reciprocate.

The magnetic member 12 is not limited to one that is always magnetic, but may be a member that is magnetic for a certain period of time, such as an electromagnet. When this electromagnet is used, the magnetic force can be changed arbitrarily by changing the current, and the movement of the shuttle 30 between attraction and reciprocation can be adjusted by acting on the magnet only when the shuttle 30 approaches. This allows the shuttle 30 to reciprocate more smoothly.

Further, the entire shuttle 30 is made of magnetic material, and for example, the tip 30a of the shuttle 30 is made of magnetic material.
It may also be partially made of a magnetic material, such as only a portion made of a magnetic material.

FIG. 4 shows another embodiment of the present invention, in which a through hole 13 is provided in the side surface 10a of the sewing table 10, and a magnetic member 12 is fitted into the through hole 13. , the magnetic member 12 is directly exposed on the side surface 10a of the sewing table 10.

Although the above embodiment has been described with reference to an example applied to a quilting machine, the present invention can also be applied to a lockstitch sewing machine equipped with a shuttle such as an embroidery machine.

(Effects of the Invention) As described above, according to the present invention, in a lockstitch sewing machine equipped with a shuttle that reciprocates the shuttle along the side surface of the sewing table, the sewing table is made of a non-magnetic material, Adjacent to the path in which the upper needle of the sewing table moves up and down, a magnetic member that attracts the shuttle is provided on the front side of the shuttle in the forward direction of the shuttle, so that the shuttle that supplies the bobbin thread when sewing is When passing through the passage of the needle on the table, it is drawn to the sewing table and passes the shuttle through the loop of the needle thread, thereby ensuring that the needle thread and bobbin thread are intertwined.

Further, in this case, since there is no deviation in the introduction of the shuttle into the loop of the upper thread, the upper thread is not pulled more than necessary. Therefore, it is possible to reliably prevent stitch skipping and thread breakage when sewing quilt fabrics or criss-crossing.

[Brief explanation of drawings]

Fig. 1 is a front view showing a sewing table and a shuttle holder of an embodiment of the present invention applied to a quilting machine, Fig. 2 is a front view of the main parts thereof, Fig. 3 is a plan view of the main parts, and Fig. 4 5 and 6 are a front view and a plan view showing a sewing table and a shuttle holder of a conventional quilting machine, and FIGS. 7 to 11 are The figures up to the figures are front views illustrating the process of tangling the upper thread and lower thread, and FIG. 12 is a plan view showing the positional relationship between the sewing table and the shuttle. In the figure, 10 is a sewing table, 12 is a magnetic member, 20 is a shuttle holder, and 30 is a shuttle.

Claims (1)

[Scope of Claims] 1. A sewing table made of a non-magnetic material and having a passage on the side surface through which the upper needle moves up and down, and a shuttle holder that allows a shuttle to reciprocate along the side surface of the sewing table. A lockstitch sewing machine equipped with a shuttle, characterized in that a magnetic member is provided adjacent to the upper needle passage on the sewing table and on the front side of the shuttle in the forward direction of the shuttle for attracting the shuttle. . 2. A lockstitch sewing machine equipped with a shuttle according to claim 1, wherein the magnetic member is an electromagnet.