JPS60173156A - 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] This invention relates to a sewing machine that is capable of embroidery stitches or decorative stitches using multiple types of threads, and more specifically, it is equipped with a large number of needle bars, and these needle bars can be selectively used. The present invention relates to a device that is operated to perform the above sewing.

With this type of sewing machine, when sewing with thread of a different color is performed after sewing with thread of one color, the previous thread hangs down from the needle for that sewing onto the fabric. and,
When sewing with thread of the next color, you may end up stepping on the previous thread while sewing, resulting in the threads getting tangled with each other or both threads co-mingling on the top of the fabric, making the pattern unclear. I had a problem with it. To solve this problem, attempts have been made to pull the thread hanging from the needle upwards from the fabric after the previous thread has finished sewing.

However, if you do this, when you finish sewing with other threads and start sewing again with the above thread, the ends of the threads will stick out on the top of the fabric, making the surface of the fabric look bad. There was a problem.

Therefore, the present invention is designed to eliminate the above-mentioned problems. When sewing with thread of one color is finished, the thread is pulled upward from the cloth, so that when sewing is performed using thread of the next color, It is possible to prevent the threads from tangling or mixing colors, but even if this is done, when sewing again with the above thread, the end of the thread should be placed on the surface of the fabric. It is an object of the present invention to provide a sewing machine which can perform sewing in good condition without popping out.

The drawings showing the embodiments of the present application will be described below.

Reference numerals 1 to 20 refer to well-known multi-spindle sewing machines (e.g.
22255 (similar to that shown in Publication No. 22255)), 1 is a bed, 2 is a throat plate, 3 is a shaft for driving the hook, 4 is a hook, and 5 is the lower side of the throat plate 2. 7 is an arm disposed above the bed 1, 8 is a drive shaft, 9 is an operating rod that can move vertically with respect to the arm 7, 10 is a crank mechanism, and ■ is a needle. The bar presser and the screw are a holder attached to the arm 7 so as to be horizontally rotatable, the mouth is a needle bar that can move up and down in response to the pressure of the holder, 14 is a needle, and 15 is movable up and down with respect to the needle bar opening. 16 is the presser foot part, 1
7 is the first spring, Yoshi is the second spring stronger than the first spring 17,
Each sign indicates a balance. 21 is a well-known needle thread with a plurality of needles 14
．． For 14..., different colors are used.

In the multi-shaft sewing machine configured as described above, the shafts 3.8 rotate in synchronization with the operation of a driving fluid GL (main motor) not shown. Then, the rotation of the shaft 3 causes the hook 4 to rotate, and the rotation of the shaft 8 causes the operating rod 9 to move up and down, and the balance knee to move up and down (
During the two rotations of the hook 402, the operating rod 9 and the balance move up and down once). The holder pressure is rotated by a drive device different from the one above, and one of the many needle bar openings is selectively positioned below the needle bar presser 11. As a result, the needle bar opening is
Sewing is performed in a well-known manner using a needle 14 which is moved up and down by a needle bar presser foot 11 which moves up and down together with the operating rod 9, and which is attached to the needle bar opening.

Next, reference numeral 24 indicates a first holding mechanism and a second holding mechanism provided in the multi-spindle sewing machine. First, the first holding mechanism will be explained in detail with reference to FIGS. 3 and 3 of the drawings.

The first holding mechanism consists of a thread presser mechanism 3 and a release mechanism I. In the presser foot i structure 5, I is the base body attached to the holding body pressure,
1 is a thread hole, 4 is a receiving piece, and the blade is a retractable rod that can be freely moved forward and backward in the direction of the arrow d with respect to the base body d. Reference numeral 31 is a holding piece that is attached using a set screw so that it can be moved forward and backward. The presser piece 31 is urged toward the receiving piece 4 by the spring. The members indicated by the above-mentioned symbols 5 to () are provided corresponding to each of the plurality of needle bar openings.Next, in the release mechanism, part is the base frame fixed to the arm 7, a is the solenoid, and a is the solenoid. 9 and 40 respectively show the grunges.A is the expansion/release piece, which is pivotally attached to the base frame.

In the first holding mechanism configured as described above, the upper thread 21 from the thread take-up is inserted into the thread hole path, between the receiver piece and the presser piece 31.
It is passed through the side of the retraction rod I into the hole of the needle 14. In this state, the upper thread 21 is clamped between the presser piece 31 and the receiving piece 9 by the biasing force of the spring field, and the upper and lower movements of the upper thread 21 are prevented. On the other hand, when the plunger U is retracted by the operation of the solenoid, the release button is swung in the direction of the arrow via the lever I and the link. As a result, in the thread presser mechanism 5 corresponding to the needle bar opening located at the position operated by the needle bar presser U, the advancing/retracting lever I is pushed by the release plate, and the presser piece 31 is separated from the catch piece guide. As a result, the upper thread 21
is ready to move through the thread hole path.

On the other hand, when the plunger I protrudes to the state shown in FIG.
The needle thread 21 is then swung in the direction away from the support piece 31, and the needle thread 21 is again clamped between the receiving piece and the holding piece 31, and is prevented from moving up and down.

Next, the second holding mechanism U will be explained in detail with reference to FIGS. S and 6 of the drawings. The Kinuta is a holding frame, which is attached to the base frame via the leg cage. The string is a slit formed in the holding frame core, and thread stoppers are attached to the upper and lower surfaces of the slit. As the thread stopper, a material with fluff such as floss, or a sandpaper-like material, which can easily hold the thread, is used. Reference numeral 47 denotes a guide member attached to the base frame I, and reference numeral 47 has a reciprocating piece that can move forward and backward along the guide member 47. The back is a thread hook attached to the advancing and retracting piece, and the tip is equipped with a hook.

51 is a rotary solenoid attached to the base frame, 52 is its operating piece, and a groove-shaped engagement part & is formed at the tip, where the engagement piece fixed to the reciprocating piece a is located. are doing.

When the second holding mechanism vortex with such a configuration occurs, the rotary solenoid 5
One actuating piece 52 swings back and forth in the direction of the arrow. the result,
The thread hook protrudes through the sleeve 45 to the position shown in FIG. 2, and then returns to the position shown by the solid line in FIG. As a result of this movement, the hooking group pulls the upper thread 4 hanging from the needle 14 into a sleeve (45) as shown in FIG.
pull inside. This drawn-in upper thread 21 is held in that state by the thread stopper.

Next, when sewing is performed using the multi-axis sewing machine configured as described above, the operation at the final stage of sewing with thread of one color and the initial operation when sewing is performed again using that thread are shown in Fig. 7 and g (4). This will be explained in detail with reference to Figures ) to (J). Kotetsuza (4) Figures ~ No. r (J) is No. 7
The balance at the point indicated by ~ (J) in the figure, needle 1
4. This shows the relationship between the futon and the pot 4, respectively. At the end of sewing, the main motor is first decelerated. In the decelerated state, the thread take-up and needle bar port move up and down as shown in the figure. In this process, first, at the point indicated by (A), the tip 4a of the shuttle hook 4 hooks the needle thread 21, and the point is reached as indicated by (4). At this point, the gth (
4) As shown in the figure, the upper thread cutting device 5 operates to cut the upper thread 2.
1 (the part that connects to the futon after passing through the hole of the needle 14, the futon, and the throat plate 2 and going around the hook 4). In this case, the upper thread 21 is about 1 inch downward from the threading hole in the needle 14.
4an left. Next, at point (6) when the thread take-up lever is raised slightly (the point at which the thread take-up rises from the horizontal position is 0)
The first holding mechanism field is in the holding state at a point where the angle is 840°. At this time, approximately 90 m of needle thread 4 remains below the threading hole (approximately 25 m of needle thread 4 remains on the thread take-up from point (4) to point CB).
(to move upward). Thereafter, the thread take-up moves to a horizontal position, and the main motor stops operating with the needle bar opening moving to top dead center. After that, the solenoid 51 required for the second holding mechanism is activated,
As shown in Fig. gΩ, the end of the needle thread 4 is pulled out from the futon and drawn into the holding frame.

In the above state, the holding body pressure is rotated in a well-known manner, and sewing using threads of other colors is performed in a well-known manner. In this case, since the needle thread 21 used in the previous sewing is held by the second holding mechanism as described above, the thread 4 is prevented from becoming entangled with the thread of the next color.

Next, after sewing with the thread of a different color is finished, when sewing with the thread is started again, the main motor starts operating at a low speed while the upper thread is held by the holding mechanism. do. As a result, the thread take-up lever and the needle bar move up and down as shown in the figure. In this case, the thread take-up 20 moves upward between the time when the main motor starts and the time indicated by ■, and the upper thread 21 is let out from a bobbin winding (not shown). Next, at the time point (3), as shown in Fig. g (G), the point 4a of the hook 4 is attached to the needle thread 21 ~-1 formed under the futon by the needle 14.
is caught, and then at point (g), the needle thread 21 caught on the tip 4a is pulled under the fabric by the rotation of the hook 4. Next, when the time point indicated by 0 is reached and the time point indicated by 0 is reached, the holding mechanism is released.

In these steps (D to 4), about 80,111 needle threads come out under the futon.After that, at the time shown in (I), the needle thread 14 is moved up and down as shown in Fig. 1 (I). The point 4a of the shuttlecock 4 is caught in the loop of the needle thread 4 formed at the next stitch point of the needle thread 4. (At this time, the thread length of the needle thread coming out below the cloth 5 is about 60 to 701111.

) Thereafter, by rotation of the hook 4, the upper thread 4 hooked on the tip 4a is drawn down below the cloth 55, and the well-known entanglement of the upper thread and the lower thread is achieved. At this time, since the needle thread take-up 11 moves upward, the needle thread 21 is pulled out from the cloth 55 by a short distance, and the number of needle thread threads protruding from the first stitch point to the bottom of the cloth 5 is, for example, about 10 to 201111. It has an extremely short length.

Thereafter, at the point (J) (the state shown in Fig. g (J)), sewing is performed in a well-known manner.

In the case of the above-mentioned operation, the upper thread and lower thread are generally not entangled in the steps (G) to (Q), but depending on the type of futon and needle thread ■ used, the tip of the upper thread m may be In some cases, the remaining upper thread 4 and lower thread are entangled in the futon.

Although the above description has been made with respect to threads of one color, the same operations are performed when sewing with threads of other colors.

As described above, the present invention has the advantage that sewing can be performed using the needle thread on the fabric by the vertical movement of the needle 14.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, in which Fig. 1 is a front view of a multi-spindle sewing machine, Fig. 2 is a longitudinal cross-sectional view, Fig. 3 is a bottom view showing the first holding mechanism, and Fig. 1 is a cross-sectional view of the multi-spindle sewing machine. Figure S is a bottom view showing the second holding mechanism, Figure 6 is a front view showing the unfolded state of the holding frame, Figure 7 is a time chart showing operation timing, Figure 1r(A) is a large cross-sectional view with line entry. ~Figure 7 (J) is shown in Figure 7 (
2) An operation explanatory diagram showing the states at the times indicated by (J). l...Bed, 4...Kettle, 7--Arm, mouth...
・Needle bar, 14... Needle, Kyu... 1st holding mechanism, feeder...
-Second holding mechanism. Figure 1 aft8 (A) Figure 1ftg (B) II 18 (C) Cause 8 (D) Figure t (1:) Figure 8CF) Figure 1iE13Ce1 Figure 8 () () Whistle 8 (
X) Figure 80) Figure

Claims (1)

[Claims] Comprising a bed and an arm disposed above the bed,
A needle bar for sewing is suspended from the free end of the arm toward the bed, and a hook is provided in the bed portion facing the needle bar, and the hook is operated in response to the vertical movement of the needle bar. A sewing machine that performs embroidery using an upper thread attached to the needle on the needle bar side and a lower thread attached to the hook.