JPS60185584A - Two-needle main stitch sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Technical Field] This invention comprises two needles arranged at intervals along an axis perpendicular to the cloth feeding direction, and two rows of needles that cooperate with each other to two thread loop catchers arranged on both sides of the two needles and each having an outer hook rotatable about one vertical axis with respect to the bed of the sewing machine in order to form a lockstitch seam; The present invention relates to a two-needle lockstitch sewing machine equipped with the following.

[Prior Art] As shown in FIG. 1, a conventional device of this type has a needle bar 15 that moves up and down, and has two needles 16a spaced apart along an axis perpendicular to the cloth feeding direction. , 16b is installed, and its two t116a.

Upper threads 18a and 18b were supported on the needle threads 16b by being inserted from between the two needles 15a and 16k, respectively, toward the outside. Furthermore, the sewing machine Mr. Ily-1A+
X'ff+atuL+1-IAa-74=9=1-1i
The thread ring catcher 20a on the 4/l+-+ side is rotated clockwise in FIG. Needle thread ring 19 carried by the left needle 16a
A is formed so as to catch it with its tip 21a;
ob is also rotated in one direction, and the needle thread ring 19b carried by the needle 16b disposed on the right side is rotated to the point 21 of the needle thread ring 19b.
There was one that was configured to be captured by b.

Here, since both thread ring catchers 20a and 20b are rotated in the opening direction in FIG. 2, the upper thread 18a and
The upper thread 188.1 is entangled with the lower threads 17a and 17b clockwise as shown in FIG.
8b and lower thread 17a.

In principle, by tensioning the seam 17b, there was a tendency to form the "V"-shaped seam shown in FIG.

However, among the stitches formed by the above-mentioned two-needle lockstitch sewing machine, the right stitch when viewed from the fabric feeding side is an "E"-shaped stitch, but the left stitch In the case of the seam on the side, the "E"-shaped seam does not appear, and a straight seam is often formed. Here, since the two-needle lockstitch sewing machine ↑ is often used for decorative stitches, the beauty of the stitches is a particular issue, and as mentioned above, the left stitch is straight and the right stitch is This unbalanced phenomenon, like the shape of an "E", was extremely inconvenient.

The above-mentioned seam formation process in the two-peg lockstitch sewing machine is shown below in Figs. 5a-1, 5a-2 to 5d, and 6a-1, 6a-2 to 6d. This is explained by: However, the upper thread 18a.

The needles 18b are inserted and supported from the inside to the inside and outside of the needles 16a and 16b, respectively.

Button 16a is connected to the seam that was sewn just before.

Upper thread 18a enters the work cloth 14 again by 16b,
18b is used as the stitch side upper thread 25a, 25b, and the needle threads 18a, 18b connected from the stitch side upper thread 25a, 25b to the bobbin winding via the buttons 16a, 16b are used as the bobbin winding side upper thread 26a, 26.
b, and the axis line including the movement line of the needles 16a, 16b in the cloth feeding direction is taken as a cloth feeding line (F>).

First, Fig. 5a-1, Fig. 5a-2 to Fig. 5d show the straight seam formed on the left side when viewed from the cloth feeding side.
This will be explained with reference to the figures.

In Figures 5a-1 and 5a-2, needle thread 2 on the seam side
The needle 16a carrying the needle 5a enters the work cloth 14 again,
At this time, the stitch-side needle thread 25a enters the workpiece cloth 14 on the left side of the fabric feed line (F) when viewed from the cloth feed line (F), and the bobbin winding-side needle thread 26a enters the workpiece cloth 14 on the right side, and Upper thread 25
A is arranged in an inverted "V" shape on the work cloth 14.

In FIG. 5b, as the needle 16a descends, the needle thread 2 on the bobbin winding side
6a is let out, the needle 16a rises from the bottom dead center, and an upper thread loop 19a is formed by friction with the work cloth 14, and the upper thread loop 19a is captured by the tip 21a of the thread loop catcher 20a.

In FIG. 5C, the needle thread loop 19a captured by the tip 21a is enlarged by the rotation of the thread loop catcher 20a as shown in FIG. The name 968 on the cliff side is the position where the light comes out from the processing side 14 from the position to the right of the cloth feed line (F) when viewed from the cloth feed side to above the cloth feed line (F). will be moved.

In FIG. 5d, due to the rotation of the thread ring catcher 20a, the lower thread 17a is wound around the upper thread thread 19a, passing through the bobbin and in the time-opening direction with respect to the lower thread 17a, as shown in FIG. 3. Entangled. After this, the bobbin winding side needle thread 26a is pulled upward by the thread take-up, and as shown in FIG. Due to the resistance of the cloth 14, the cloth feed line (F
) It comes to rest near the top and a straight seam is formed.

Next, regarding the "M1" seam formed on the right side when viewed from the cloth feeding side, see Figures 6a-1, 68-2 to 6d.
This will be explained with reference to the figures.

In Figures 6a-1 and 6a-2, needle thread 2 on the seam side
The needle 16b carrying the needle 5b enters the work cloth 14, and at this time, the needle thread 25b on the seam side enters the work cloth 14 on the right side of the cloth feed line (F) as seen from the cloth feed side, and the thread winds up. The side needle thread 26b enters on the left side and the stitch side needle thread 25
The portions a are arranged in a ``V'' shape on the work cloth '14.

In FIG. 6b, the needle thread loop 19b formed in the same manner as in FIG. 5b is captured by the tip 21b of the thread loop catcher 20b.

In FIG. 6C, the needle thread 19b caught by the tip 21b is expanded by the rotation of the thread ring catcher 20b as shown in FIG. The upper thread 26 on the bobbin winding side
The position where b exits from the work cloth 14 is not moved to the right because it is obstructed by the stitch side upper thread 25b, but is only moved substantially forward.

In Fig. 6d, the needle thread ring 19 is similar to Fig. 5d.
b passes through the bobbin on which the bobbin thread 17b is wound, and the bobbin thread 1
7b in a clockwise direction.

After this, the bobbin winding side needle thread 26b is pulled upward by a take-up, and the stitching side needle thread 25b is arranged in a "V" shape.
can be tightened in its original state. In this way, an "E"-shaped seam is formed.

As described above, conventional two-needle lockstitch sewing machines have the disadvantage that the shapes of the stitches are different from each other.

[Objective] The present invention has been made in order to eliminate the drawbacks of the conventional sewing machine, and its purpose is to provide a two-needle lockstitch sewing machine that can form the same straight stitches on both the left and right sides. be.

[Solution Means] In the present invention, of the two thread loop catchers, the first thread loop catcher, which is disposed on the left side when viewed from above on the fabric feed side of the sewing machine, has an outer hook that rotates clockwise. a second thread ring catcher configured to catch the upper thread thread carried on one of the barrels of the two needles by being rotated, and arranged to the right from above the cloth feeding side; is configured such that when its outer hook is rotated counterclockwise, it captures the upper thread loop carried by the two needles.

Embodiment] The details will be described below with reference to FIGS. 7 to 13 showing an embodiment in which the present invention is embodied in a two-needle lockstitch needle-feed sewing machine.

In the figure, a bed 30 of the sewing machine supports a lower shaft 31, and this lower shaft 31 is connected to and rotated by an upper shaft (not shown). On the bed 30, a pair of hook bases 32a and 32b are installed on the left and right sides of the feed m33 installed on the feed base 29 in FIG. 7. This feed dog 33 is the eighth
As shown in the figure, a known nail feeding movement is performed in cooperation with a pair of left and right needles 168, 16b. Further, a pair of left and right drive spiral gears 35a' and 35b formed in a line-symmetrical relationship are supported on the lower shaft 31, and these drive spiral gears r35a.

35b is rotatable together with the lower shaft 31.

A pair of left and right hook shafts 37a, 37b, which are rotatable around a vertical axis, are respectively supported on the hook bases 32a, 32b, and these hook shafts 37a, 37b are formed in a line-symmetrical relationship. Driven spiral gears 38a and 38-b are each fixed, and these driven spiral gears 3
8a and 38b are the driving spiral gears 35a and 35b.
are interlocked with each other. Therefore, as the lower shaft 31 rotates, the left hook shaft 37a is rotated clockwise when viewed from above on the cloth feeding side, and the right hook shaft 37b
is rotated counterclockwise when viewed from above on the cloth feeding side.

Further, a first thread ring catcher 36a is provided at the upper end of the left hook shaft 37a, and the first thread ring catcher 36
The outer pot 39a of a is an inner pot 41 in which a pot 40a is accommodated.
a and is fixed to the upper end of the hook shaft 37a. Furthermore, when the first thread ring catcher 36a is rotated clockwise, the tip 42a catches the upper thread thread ring 50a formed by the vertical movement of the above-mentioned 1134a.
is formed in the outer hook 39a.

On the other hand, the upper end portion of the right hook shaft 37b has the first
A second thread loop catcher 36b is installed which is provided with an outer hook 39b, an inner hook 41b, and a tip 42b formed in line symmetry with the thread loop catcher 36a. It is rotated counterclockwise together with the hook shaft 37b when viewed from above on the cloth feeding side.

This counterclockwise rotation causes the tip 42b to
-L 34. Upper thread loop 5 formed by vertical movement of b
It is possible to capture 0b.

Here, Δ
- Bunners 43a, 43b and thread cutting knives 44a, 4.4
b is installed.

Next, its effect will be explained.

First, the user of the sewing machine passes the needle threads 51a and 51b through the two threads 1134a and 34b from the inside to the outside of the circle, sets the work cloth 55, and starts the sewing machine. The catcher 36a is rotated clockwise when viewed from above on the cloth feeding side, and the second thread ring catcher 36b is rotated counterclockwise. At this time, the needle threads 51a, 51b that cross along the upper surface of the work cloth 55 and enter the work cloth 55 by the needles 3'4a, 34b are treated as stitch-side needle threads 52a, 52b. A series of swords 34a
, 34b, the upper thread 51a is connected to the bobbin winding.

51b is the bobbin winding side upper thread 53a, 53b.

Here, regarding the stitch formed by the cooperation of the first thread loop catcher 36a and the sword 34a, FIGS.
This is similar to the conventional example shown in FIGS. 8-2 to 5d. That is, the stitch-side needle thread 52a enters the work cloth 55 in an inverted "V" shape, and the needle thread loop 50a formed by the upward movement of the needle 34a is connected to the first thread loop catcher. 36a rotates clockwise, it is captured by its tip 42a,
The upper thread 51a is entangled with the bobbin thread 54a in a clockwise direction, and as the bobbin winding side upper thread 53a is pulled up by the thread take-up, the stitching side upper thread 52a changes from a reverse "V" shape to a "V" shape. This movement is hindered by the resistance of the work cloth 55 when subjected to the force of movement, so that a straight seam can be obtained.

On the other hand, regarding the stitch formed by the cooperation of the second thread loop catcher 36b and i'134b, FIG.
The explanation will be made according to FIGS. 3a-2 to 13d.

In FIGS. 138-1 and 13a-2, the needle 34b carrying the I-stitch side upper thread 52b enters the work cloth 55 again, and at this time the stitch-side upper thread 52b reaches the cloth feed line ([) The needle thread 53b on the winding side enters the work cloth 55 on the right side when viewed from the cloth feed side, and the needle thread 53b on the winding side enters on the left side, and the needle thread 52b on the seam side forms a "V" shape on the work cloth 55. Placed.

In FIG. 13b, as the needle 34b descends, the bobbin winding side needle thread 53b is let out, and the needle 34. b rises from the bottom dead center, and due to friction with the work cloth 55, an upper thread loop 5ob is formed,
As shown in FIG. 10, the upper thread loop 50b is captured by the tip 42b of the second thread loop catcher 36b as it rotates in the counterclockwise g1 direction.

In FIG. 13c, the needle thread loop 50b captured by the tip/12b is enlarged as the second thread loop catcher 36b rotates, and is pulled from the front to the right when viewed from the cloth feeding side, and the needle thread loop 50b is caught by the tip/12b. The side needle thread 53b is moved from a position where the position where it exits from the work cloth 55 is to the left of the cloth feed line (') to above the cloth feed line (F).

In FIG. 113d, due to the rotation of the second thread loop catcher 36b, the upper thread thread 50b passes through the bobbin on which the lower thread 54bIfi is wound, as shown in FIG. 11, and the upper thread 5'1
b is the lower thread 54. It gets entangled in the anti-Tokita direction with respect to b.

Originally, when the upper thread is entangled with the lower thread in a counterclockwise direction when viewed from the cloth feeding side J:, a reverse "V"-shaped stitch is formed.

Therefore, when the bobbin winding side needle thread 5.3b is pulled up by a balance, the seam side needle thread 52b, which was initially arranged in a "V" shape, is subjected to a force that tends to become an inverted "V" shape. , due to the resistance of the work cloth 55, it does not form an inverted "V" shape, but remains stationary on the cloth feed line (F), and a straight seam is formed.

Note that the present invention is not limited to the above-described embodiments, and even if the second thread ring catcher is not formed in a line-symmetrical relationship with respect to the first thread ring catcher, Any sewing machine that can catch the needle thread ring by rotating it counterclockwise can be used.

[Effect] As described above, the present invention rotates clockwise the first thread ring catcher, which is located to the left of the button that is located to the left of the two swords when viewed from above on the cloth feeding side. Then, rotate the second thread ring catcher placed to the right of the needle placed to the right counterclockwise, and move the two swords from the inside to the outside.
Since the upper thread is held by the upper thread, the upper thread on the left side that enters the support beam h in the shape of an inverted "M" is "M".
The upper thread on the right side tries to form a ``M'' shape and enters the processed fabric, and as a result, due to the resistance of the processed fabric, etc. It is possible to form two straight seams.

[Brief explanation of the drawing]

Fig. 1 shows the state in which the upper thread is carried by two buttons according to the conventional method and the present invention, and Fig. 2 shows the rotation direction of the conventional thread ring catcher and the needle thread ring being pulled by the tip of the conventional thread ring catcher. Figure 3 is a diagram that does not show how the upper thread and lower thread are intertwined, Figure 4 is a plan view showing a "V"-shaped stitch, Figures 5a-1 and 5a-2. Figures 5d to 5d are diagrams illustrating a state in which a seam is formed on the left side when viewed from the conventional cloth feeding side, and
Figures a-i are drawings showing the state in which the needle penetrates the workpiece cloth,
Figure a-2 is a sectional view taken along the line A-A in Figure 5a-1, Figure 5b is a close-up view of the state in which the needle tip captures the needle thread ring carried by the needle, and Figure 5C shows the needle thread ring being captured. A plan view showing the state of the stitch in J3 when the upper thread loop is pulled by the tip of the utensil, and Figure 5d shows the state of the stitch in the state where the upper thread is pulled up by the thread take-up. It is a diagram. Figures 68-1, 68-2 to 6d are
Figure 7 is a diagram showing a state in which seams are formed on the right side when viewed from the conventional cloth feeding side, corresponding to Figures 1 and 5a-2 to 5d. A top view showing the main parts of the two-needle lockstitch sewing machine, FIG. 8 is a sectional view taken along line B-B,
Fig. 9 is a perspective view showing the drive system of the first and second thread ring catchers, Fig. 10 is a diagram showing how the needle thread ring is pulled by the tip of the thread ring catcher, and Fig. 11 The figure shows how the upper thread and bobbin thread are intertwined. Figure 12 is a plan view showing the inverted "M" character stitches. Figures 13a-1, 13a-2 to 13d are the 5a-1 and 5a-2 to 5d, showing a state in which a seam is formed on the right side when viewed from the cloth feeding side of the present invention; FIG. In the figure, 30 is a bed, 34a and 34b are needles, 36a is a first thread loop catcher, 39a is its outer hook, 36b is a second thread loop catcher, 39b is its outer hook, and 5Qa and 50b are upper It is a thread ring. Special γf Applicant Brother Industries, Ltd. President Masaharu Kawashima Figure 5a-1 Figure 5a-2 Figure 1 Figure 6a-1 Figure 6a-2 Figure 5c Figure 5d Figure 6c Figure 1b F 4b Figure 12, 3? a , \, \go(,,'2a 1a Figure 10F ~ River 1b

Claims (1)

[Claims] 1. Two needles arranged at intervals along an axis perpendicular to the cloth feeding direction, and two rows of lockstitch stitches working together with these two needles. two thread loop catchers disposed on both sides of the two needles and each having an outer hook rotatable about one vertical axis with respect to the bed of the sewing machine; Of the thread ring catchers, the first thread ring catcher, which is located on the left side when viewed from above the fabric feed side of the sewing machine, is able to control the two buttons by rotating its outer hook clockwise. The second thread ring catcher is configured to catch the upper thread thread carried by one of the upper thread thread rings and is disposed on the right side when viewed from above the cloth feeding side. A two-needle lockstitch sewing machine, characterized in that the other of the two needles is rotated so that the other one of the two needles is rotated.