JPH0791775B2 - How to stab - Google Patents

Description

TECHNICAL FIELD The present invention relates to an embroidery method using an embroidery device.

(Prior Art and Problems Thereof) In sewing of a sewing machine, there are a perfect stitch and a hitch stitch which are determined by the relationship between the needle and the upper thread and the relationship between the needle and the lower thread as the stitch shape. An example of the vertical half-turn front hook shown in FIG. 5 will be described. In FIG. 13, the lower side is the front side of the sewing machine, the direction of movement of the cloth with respect to the needle drop point C is indicated by the arrow D, and the regions are divided into A1, A2, B1, and B2 according to the direction of the arrow D. The relationship between the needle and the lower thread and the relationship between the needle and the upper thread in each area is represented by P for the perfect stitch relationship and H for the hitch stitch relationship (the drawing numbers of the drawings showing the respective relationships are added). The seams in A1, A2, B1, and B2 are respectively in this order in the process of a, b, and c of FIG. 19, FIG. 20, FIG. 21, and FIG.
The stitches are shown in Table 1.

In Table 1, PS shows perfect stitches and HS shows hitch stitches.

In each of FIGS. 14 to 16, the lower side of each drawing is the front side of the sewing machine, 1 is a needle hole, NL is a sewing needle, T ₁ is a lower thread, and an arrow represents the moving direction of the cloth.

In FIGS. 17 and 18, the lower side of each figure is the front side of the sewing machine, NL is the sewing needle, T ₂ is the upper thread, and the arrow indicates the moving direction of the cloth.

19 to 22, the left side of each drawing is the front side of the sewing machine, NL is a sewing needle, T ₁ is a lower thread, T ₂ is an upper thread, 2 is an inner hook, 3
Is the bobbin case. Strictly speaking, the stitches near the boundary area between the areas A1 and A2 and the areas B1 and B2 in FIG. 13 are a mixture of perfect stitch (hereinafter abbreviated as PS) and hitch stitch (hereinafter abbreviated as HS). When embroidering using a vertical half-turn front kettle as in the example, the appearance ratio of PS and HS is about 1: 1.

Even with other types of kettles, the application ratio of PS and HS is often about 1: 1.

PS twists the thread and HS twists the thread back.

Accumulation of twisted threads causes skipped stitches, and accumulation of twisted threads causes crimping and thread breakage.

In the sewing of the pattern sewing by the sewing machine, since the number of stitches forming the pattern is relatively small, there is no particular problem due to the accumulation of the twisting of the thread and the return of the twisting. However, in the case of embroidery with an embroidery device, for example, in the case of kanji embroidery that fits within a frame with a length and width of 20 mm, the average is about 400 to 500 stitches, and if the number of strokes is large, it is about 900 to 1000 stitches. In some cases, there were problems such as skipping of eyes and wrinkles and thread breakage due to the accumulation of twist and twist return.

(Means for Solving Problems and Actions of the Invention) The present invention is to repeatedly mix a plurality of continuous perfect stitches in a large number of stitches that form an embroidery pattern, and further to connect a plurality of continuous perfect stitches and the following. Since the stitches are stitched by repeating a set of multiple continuous hitch stitches, the twisted state of the thread is always kept within the normal range during the stitching, and the stitches and whiskers are accumulated due to the accumulation of twisting and twisting back of the thread. There is an effect that embroidery can be performed in a good condition in which no yarn breakage occurs.

(Examples) The present invention will be described below with reference to examples.

The relationship between the needle and the lower thread and between the needle and the upper thread can be changed by the control of the lower thread control means and the upper thread control means.

Lower thread control means In FIGS. 5 and 6, an operation piece 4 is arranged in the path of the lower thread T ₁ on the lower surface of the needle plate, and the piece is controlled by an actuator such as a linear motor. These constitute the lower thread control means 5.

The control includes a control for moving the lower thread T ₁ to the right side as shown in FIG. 9 and a control for moving the lower thread T ₁ to the left side as shown in FIG. 10 by the operation piece 4, and the timing of these controls is the sewing machine needle ( Before the NL) enters the needle plate needle hole 1, the operation piece 4 is moved to the left or right side, and after the sewing machine needle (NL) comes out of the needle plate needle hole 1, it is returned to the intermediate position shown in FIG.

The state shown in FIG. 9 is a state in which the operation piece 4 is moved to the right side and the A1 area is controlled in a hitch stitch relationship (hereinafter abbreviated as H).

The state shown in FIG. 10 is a state in which the operation piece 4 is moved to the left and the A2 area is controlled to have a perfect stitch relationship (hereinafter abbreviated as P).

Needle thread control means In FIGS. 7 and 8, the needle bar 6 is a long groove 7a of the needle bar holder 7.
Is rotatably supported by a pin 8 and the flat portion 6a is slidably fitted in a groove 9a of a gear 9 rotatably supported by the machine frame of the sewing machine. A gear 11 fixed to a motor 10 meshes with the gear 9, and rotation of the output shaft 12 is controlled by the rotation of the output shaft 12 to a right rotation position and a left rotation position, These constitute the upper thread control means 15.

The right rotation position means the center of the needle bar 6 and the gear 9 in FIG.
The line connecting to the virtual point 16 above is the position moved from the E phase, which represents the intermediate position, to the F phase of about 90 ° clockwise, and the left rotation position is about 90 counterclockwise from the E phase. This is the position moved to the G phase of °.

The timing of this control is to move to the right rotation position F or the left rotation position G after the thread ring is captured by the hook and before the hoop is moved, and before the sewing machine needle (NL) enters the needle plate needle hole. Return to the intermediate position E shown in FIG.

The state shown in FIG. 11 is a state in which the B1 region is controlled to H by moving the needle bar 6 to the right rotation position together with the sewing machine needle (NL) and then moving the hoop.

The state shown in FIG. 12 is a state in which the needle bar 6 is moved to the left rotation position together with the sewing machine needle (NL), and the B2 region is controlled to P by the subsequent movement of the hoop.

Perfect stitch control From the above, by operating the bobbin thread control means 5 and the upper thread control means 15 as necessary, all of the areas A1, A2, B1, B2 in FIG. 13 can be set to PS. The combinations are shown in Table 2. Those underlined in the table are due to control.

Hitch stitch control From the above, the lower thread control means 5 and the upper thread control means are provided as necessary.
By operating 15, all areas A1, A2, B1, B2 in FIG. 13 can be made HS, and the combinations are shown in Table 3.

First Embroidery Method The first embroidery method will be described with reference to the flowcharts of FIGS. 1 and 2.

This first embroidery method starts with embroidering
The counter C is cleared at SP1, and then the lower thread control means 5 and the upper thread control means 15 are not controlled, and SP2 is repeated until N is reached.
The needlework is sewn.

When N stitches are sewn, the counter C is cleared at SP3, and then the lower thread control means 5 and the upper thread control means 1 at SP4.
The PS stitching of M needles is performed by controlling 5 according to the area, and the N stitches that are not controlled until the end signal and the M stitching stitches of PS are repeatedly performed.
The contents of "PS control" in SP4 are shown in the flowchart of FIG. 2 created corresponding to Table 2. Once in "PS control", it is calculated moving direction of the fabric due to the movement of the embroidery frame from the previous stitch coordinates and the current seam coordinates of embroidery data initially in SP21, A ₁ of the area A by the judgment of SP22 In the case of the area, it is not controlled. In the case of the area A2, the operation piece 4 is controlled to the left side position by SP23.

This control is shown in FIG. 16 after the operation piece 4 is moved to the left position before the sewing machine needle (NL) enters the needle plate needle hole 1 and the sewing machine needle comes out of the needle plate needle hole 1 as described above. Perform at the timing of returning to the intermediate position.

In the case of the B1 region, no control is performed, and in the case of the B2 region, the sewing machine needle (NL) is controlled to the left rotation position by controlling the needle bar 6 to the left rotation position at SP24. As described above, this control moves the needle bar 6 to the left rotation position G after the thread loop is captured by the shuttle and before the hoop is moved, and before the needle bar 6 of the sewing machine needle (NL) enters the needle plate needle hole 1. It is performed at the timing of returning to the intermediate position shown in FIG. By the subsequent rotation of the upper shaft, PS is formed in all areas A1, A2, B1 and B2.

Looking at the repeated N needle embroidery stitches by SP2 as a whole, the appearance ratio of PS and HS is about 1: 1 as described above,
In addition, since the amount of twist of the thread by one HS is larger than the amount of twist of the thread by one PS, the twist of the thread tends to return during embroidering with SP2.

This first embroidery method is to correct the twist of the thread by SP4 so that the twist of the thread is always kept within the normal range. The values of the stitch numbers N and M are set in advance. It can be set or it can be adjusted individually before embroidering.

According to this first embroidery method, the cumulative amount of untwisting of threads during continuous stitching of N needles can be set within the range in which no crimping or thread breakage occurs, and is subsequently untwisted by the M needles. Since the twisted yarn is twisted up, the twisting of the yarn is always kept within the normal range during the embroidery, and it is possible to perform the embroidery in a good condition without the rustling, the thread breakage and the skipping of eyes.

Second embroidery method Regarding the second embroidery method, FIG. 2, FIG. 3 and FIG.
Description will be given with reference to the drawings.

In the second embroidery method, the bobbin thread control means 5 and the upper thread control means 15 are first controlled according to the area at the time of embroidering.
Stitch the P needle with PS to twist the thread, and then control the lower thread control means 5 and the upper thread control means 15 according to the area to perform the HS stitch with the Q needle and twist the thread. This is a method of embroidering while keeping the twist of the thread within the normal range by returning the thread, correcting it, and repeating these steps.

This second embroidery method starts with embroidering
The counter C is cleared at SP11, and then the lower thread control means 5 and the upper thread control means 15 are controlled according to the area, and SP12 is repeated to perform embroidery sewing with PS for P needles.

When the P needle is sewn, the counter C is cleared at SP13, and then the lower thread control means 5 and the upper thread control means at SP14.
HS is sewn with the Q needle by controlling 15 according to the area, and the P needle is sewn with the PS and the Q needle is sewn with the HS repeatedly until the end signal is received. SP14
The content of "HS control" is shown in the flowchart of FIG. 4 created corresponding to Table 3. When you enter "HS control",
First, in SP31, the moving direction of the cloth due to the movement of the embroidery frame is calculated from the previous stitch coordinates of the embroidery data and the present stitch coordinates. If SP1 determines the A1 area in the A area, operate it in SP33. The strip 4 is controlled to the right position. This control is shown in FIG. 16 after moving the operating piece 4 to the right position before the sewing machine needle (NL) enters the needle plate needle hole 1 and after the sewing machine needle comes out of the needle plate needle hole 1 as described above. Perform at the timing of returning to the intermediate position. It is not controlled in the case of A2 area.
In the case of the B1 region, the sewing machine needle (NL) is controlled to the right rotation position by controlling the needle bar to the right rotation position at SP34, and this control is performed after the thread loop is captured by the shuttle as described above. The needle bar 6 is moved to the right rotation position (F) before the movement of No. and is returned to the intermediate position shown in FIG. 17 before the sewing machine needle (NL) enters the needle plate needle hole 1. It is not controlled in the case of B2 area. HS is formed in all areas of A1, A2, B1, and B2 by the subsequent rotation of the upper shaft.

According to this second embroidery method, the accumulation of twists of the thread when the P needles are continuously sewn can be set within a range in which skipping does not occur, and the thread that has been twisted up by the subsequent Q needles is twisted back. , The twisting of the thread is always kept within the normal range during the embroidery, and it is possible to perform the embroidery in a good condition with no skips, wrinkles and thread breakage.

(Effect) As described above, according to the present invention, a plurality of continuous perfect stitches are repeatedly mixed in a large number of stitches forming an embroidery, and further, a plurality of continuous perfect stitches and a plurality of continuous hitches subsequent thereto. Since the stitches are repeated to perform embroidery, the twisted state of the thread is always kept within the normal range during embroidery.
The effect that the embroidery can be performed in a good state in which skips, folds, and thread breakage due to the accumulation of twisting and untwisting of threads is not obtained.

[Brief description of drawings]

1 is a flowchart corresponding to a program of a first embroidery method, and FIG. 2 is a flowchart corresponding to a subroutine program showing the contents of "PS control" of SP4 of FIG. , Fig. 3 is a flow chart corresponding to the program of the second embroidery method, Fig. 4 is a flow chart corresponding to a subroutine program showing the contents of "HS control" of SP14 in Fig. 3, and Fig. 5 is a vertical anti-rotation front view. FIG. 6 is a view of the lower thread control device arranged in the hook, FIG. 6 is a view of the lower thread control device as seen from the arrow J of FIG. 5, FIG. 7 is a view showing the upper thread control device, and FIG. A view of the main part of the arrow K in the figure,
FIGS. 9 and 10 are diagrams in which the bobbin thread is controlled to the right side position and the left side position by the bobbin thread control device in this order respectively, and FIGS. 11 and 12 are the sewing needle in the right turn position and the left turn position, respectively. Figure controlled to the moving position, FIG. 13 is a diagram showing the relationship between the moving direction of the cloth and the area, FIG. 14, FIG. 15 and FIG.
The diagrams showing the relationship between the lower thread and the sewing machine needle in A1, A2, B1 and B2, FIG. 17 and FIG. 18 respectively show the regions B1, B2 in this order.
Showing the relationship between the upper thread, the sewing machine needle and the upper thread in FIG.
Figures (a), (b), (c) to Figures 22 (a), (b),
(C) is a figure which shows the formation process of PS, HS, PS, and HS, respectively in this order. 5 is a lower thread control means, 15 is an upper thread control means, SP21 and 31 are means for calculating the moving direction of the cloth, and SP22 and 32 are means for judging the moving area of the cloth.

Claims (3)

[Claims] 1. In an embroidery device for embroidering while forming stitches by relatively moving a stitch forming mechanism and an embroidery frame based on embroidery data, an upper thread control means for controlling a relationship between an upper thread and a needle. And a lower thread control means for controlling the relationship of the lower thread with the needle, a means for calculating the moving direction of the cloth for the current needle drop from the stitch coordinates of the previous time and the current time based on the embroidery data, and a calculation result of the moving direction. And a means for judging a moving area of the cloth which is divided into a plurality of areas according to the moving direction of the cloth with respect to the needle drop of the sewing machine, and controls the upper thread controlling means and the lower thread controlling means according to the judgment result of the area. An embroidering method characterized by: 2. The embroidery method according to claim 1, wherein a plurality of continuous perfect stitches are repeatedly mixed in a large number of stitches which form the embroidery. 3. The embroidery is performed by repeating a set of stitches consisting of a plurality of continuous perfect stitches and a plurality of hitch stitches following the plurality of stitches constituting the embroidery. The embroidery method according to item 1.