JP2649797B2 - Two-color sewing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pattern sewing machine, and more particularly to a sewing machine that obtains a bicolor pattern on a cloth surface by using threads of different colors for an upper thread and a lower thread.

(Prior art) In pattern sewing in a sewing machine, a needle and a cloth are relatively moved to form a stitch. In pattern sewing, an interlacing position of an upper thread and a lower thread is determined by a central portion in the thickness direction of the cloth or the cloth. Generally, it is set near the lower side, and a seam is formed on the cloth surface by the upper thread. Therefore, it was necessary to change the color type of the upper thread in order to form a pattern with different colored threads on the cloth surface.

(Problems to be Solved by the Invention) When a sewing pattern is formed using a single-color upper thread, even if various patterns are drawn, the change is monotonous due to the color of the upper thread only and has little change. If you change a part of the pattern to another color, you need to change the needle thread during the pattern stitching,
In the case where the same sewing pattern is formed many times, there are disadvantages such as uneven finish. Conventionally, for this purpose, the thread tension of the upper thread for pattern sewing using different colors for the upper and lower threads is adjusted to change the thread condition of the upper and lower threads to form a sewing pattern with the upper thread on the surface of the cloth or the upper thread. And a lower thread have been proposed to form a two-color pattern by forming a sewing pattern. However, these are intended to change the thread tension of the upper thread or to adjust the supply amount of the upper thread in order to form a sewing pattern of the upper thread or the lower thread on the cloth surface using upper and lower threads of different colors. When forming a sewing pattern with a lower thread by pulling up a lower thread on the surface of the cloth by adjusting the upper thread, as opposed to forming a seam on the cloth table with the upper thread, which is a conventional normal seam. It is necessary to control the thread tension of the needle thread extremely strongly compared to the formation of the seam where the yarn entanglement position is at the center of the cloth, and it is necessary to control not only thin cloth but also relatively thick cloth depending on the size of the pattern. There was no remarkable shrinkage of the cloth in the running direction of the yarn, and there was no practical use.

(Means for Solving the Problems) In contrast, the present invention provides a stitch forming apparatus including a needle that holds an upper thread and moves up and down and a needle thread catcher that holds a lower thread and cooperates with the needle, In a sewing machine including a sewing pattern storage device, the sewing pattern selection device, the sewing pattern generation device, and a thread tension adjusting device, the sewing pattern storage device moves the needle and the material relative to each other. A pattern generating information for instructing an amount, a thread tension adjusting information for adjusting the upper thread and the lower thread interlacing position by at least one of the upper thread and the lower thread, and a sewing pattern and a thread adjusting pattern. A storage device for storing a combination of thread tension adjustments corresponding to each formation of a stitch or for each sewing pattern by selecting the storage device, the storage device and the stitch generation device, an adjustment device for the upper thread strength, and a lower thread strength. Connected to a control unit via a central processing unit .

(Operation) The entanglement position of the sewing pattern and the upper and lower threads is selected by the selection device, combined and stored in the storage device, and at the time of execution of sewing, the relative position between the needle and the material is determined based on the sewing pattern generation information. It moves in synchronism with the operation to form a sewing pattern, and operates the upper / lower thread strength adjusting device according to the upper / lower thread adjustment information to set the entanglement position of the stitch corresponding to the formation of the sewing pattern. In the cloth, a sewing pattern is formed by the upper thread in place of the cloth table, and a sewing pattern is formed by the upper thread and the lower thread, thereby forming a two-color stitch by upper and lower threads having different colors.

(Example) Next, according to an example of the present invention, a pattern seam is formed by the left and right movement of the needle and the forward and backward movement of the cloth feed. A description will be given by taking a so-called zigzag sewing machine as an example. FIGS. 1 to 13 relate to a first embodiment of the present invention, and the sewing machine frame 1 is connected to a drive unit (not shown) and connected to a drive shaft 2 to which rotation is transmitted. The needle bar 3 is supported so as to be able to move up and down, and an upper thread supply device 6 for supplying a fixed amount of the upper thread 5 from the upper thread spool 4 is disposed between the upper thread spool 4 and a needle 17 fixed to the needle bar 3. Have been. As shown in FIG. 2, the needle bar 3 is rotatably supported on the shaft of a needle bar crank 8 fixed to one end of a crank 7 provided at the shaft end of a drive shaft 2 rotatably supported on the sewing machine frame 1. The other end of the crank rod 9 to be connected is inserted and fixed to a needle bar holder 10 having a rotatable shaft. The needle bar holder is inserted into a needle bar support 11 at the upper and lower portions thereof, and is supported so as to be vertically movable. ing. The needle bar support is a shaft fixed to the sewing machine frame 1.
It is fitted to 12 and is supported so that it can rotate only with restricted vertical movement. The other end of the needle bar support 11 is connected to one end of a connecting rod 13, and the other end of the connecting rod is the output shaft of a needle bar swing stepping motor 14 fixed to the sewing machine frame 1.
14a is connected to a fixed arm 15 via a ring 16.

A needle plate 18 having a needle hole 18a through which a fixed needle 17 is inserted at the tip of the needle bar 3 is fixed to the sewing machine frame 1 below the needle bar 3. 19 is a feed dog, which is the needle plate 18
The cloth held and moved in and out of the feed dog groove 18b provided in the above and cooperating with the cloth presser 20 is moved in synchronization with the vertical movement of the needle. The feed dog 19 is fixed to a horizontal feed arm 21 driven by the drive shaft 2, and the adjustment of the momentum of the horizontal feed arm is performed by adjusting the swing amount of the horizontal feed arm.
A swing amount adjusting member 22 is fixed to the shaft end of the adjusting shaft 23, and adjusts the amount of transmission to the horizontal feed arm 21 by the rotation of the swing amount adjusting member. Sticking arm
24 and a crank 26 fixedly connected to an output shaft of a feed adjusting stepping motor 25 fixed to the sewing machine frame 1 via a link 27.

Numeral 28 denotes a shuttle serving as a needle thread catching means, which is rotatably supported by the sewing machine frame 1 below the needle plate 18,
The hook shaft gear 30 fixed to the hook shaft 29 rotated in synchronization with the needle bar 3 and the gear 31 of the hook integrally fixed to the lower portion of the hook 28 are fitted to transmit rotation. .

The upper thread spool 4 mounted on the upper part of the sewing machine frame 1 and the needle
The upper thread supply device 6 disposed in the upper thread path between the upper thread supply device 17 and the upper thread supply device 17 is driven by the output shaft 32a of the upper thread supply drive motor 32 fixed to the sewing machine frame 1 as shown in FIG. A roller 33 is fixed, and a driven roller 34 is in contact with the driving roller. During this time, the upper thread is guided by a thread guide 35 and is held between a pair of rollers. The upper thread supply drive motor 32, which is a driving means of the drive roller 33, is provided with an upper thread supply amount calculation device (not shown) disposed in the sewing machine frame 1.
It is linked to The configuration of the upper thread supply amount calculating device is the fourth type.
As shown in the figure, the supply amount of the upper thread is calculated so that the entangled portion of the seam is located at the center of the cloth thickness with respect to sewing conditions such as cloth, thread, and sewing pattern.

The support structure of the driven roller 34 that contacts the drive roller 33 will be described with reference to FIG. A support 37 is rotatably fitted to a pin 36 fixed to the sewing machine frame 1, and the driven roller 34 is rotatably fitted to a pin 38 fixed to the support. Reference numeral 39 denotes an operating body, which is rotatably fitted to a shaft 40 fixed to the sewing machine frame 1, and a pin 37a integrally formed with the support 37 is fitted to a long groove 39a provided at one end thereof. A spring 41 is provided between the operating body 39 and the sewing machine frame 1. Due to the bias of the spring, the operating body 39 always rotates in the direction of arrow A to rotate the long groove 39a.
Is in contact with the pin 37a of the support 37, and the support is rotated in the direction of arrow A to press the driven roll 34 against the drive roll 33 as shown by the solid line in the figure. An operating lever 42 is rotatably supported by a pin 43 fixed to the sewing machine frame 1 and is always rotated in the direction of arrow B by a spring 44 provided between one end thereof and the sewing machine frame 1. As a result, the tip of the operating lever 42 rotates in the direction of arrow B and is positioned in contact with the stop plate 45 fixed to the sewing machine frame 1. As shown by a solid line in the drawing, the distal end of the operating lever 42 and the operating body 39 are set to have a clearance so as not to come into contact with each other. The position indicated by the two-dot chain line in the drawing is the case where threading is performed between the pair of rollers. Abuts against one end of the operating lever 42, pushes up against the bias of the spring 44, rotates the operating lever in the direction opposite to the arrow B, and the distal end 42a contacts the operating body 39. To rotate the operating body in the direction opposite to arrow A,
The left end of the long groove 39a of the operating body rotates while contacting the pin 37a of the support 37, and moves the support 37 to the position indicated by the two-dot chain line in the figure to separate the driven roll 34 from the drive roll 33. .

The adjusting device for the bobbin thread 47 is as shown in FIGS. 6 to 8, and an inner shuttle 49 for accommodating a bobbin winder 48 serving as a lower thread holding means inside the shuttle 28 has a rotation preventing member ( (Not shown)
The rotation is prevented by and is held. 50 is the inner pot
The lower thread guide plate is fixed to the step portion 49a of the 49. The upper surface 50a is substantially the same height as the upper surface 49b of the inner shuttle 49. A lower thread feeding lever 51 is fitted and fixed to a feeding shaft 52 rotatably supported by the sewing machine frame 1, and a bridge portion 51a at a tip thereof has a wall 49c of a stepped portion of the inner hook and the wall 49c. Lower thread guide plate
It is located between 50 and.

As shown in FIG. 6, a cam 54 is fixed to a lower shaft 53, which is connected to the drive shaft 2 supported by the sewing machine frame 1 by a transmission means and is rotationally transmitted, as shown in FIG. The other end of the bifurcated rod 55 having a bifurcated portion 55a fitted to the cam is fixed with a headed pin 57 fitted into a hole provided at the end of a link 56 fixed to the feed shaft 52.
An adjusting cam shaft 58 is rotatably supported by the sewing machine frame 1 and has an adjusting cam 59 fixed to one end thereof. A pin 55b is fixed to the middle of the forked rod 55, and the pin is fitted in a cam groove 59a of the adjusting cam 59. An arm 60 is fixed to the other end of the adjusting cam shaft 58, and the other end of the link 62 that fits into the pin 61 fixed to the tip of the arm is connected to the output shaft of a stepping motor 63 fixed to the sewing machine frame 1. The fixed pin 65 is fitted and connected to the fixed arm 64.

Next, a pattern selecting device will be described. Reference numeral 66 denotes a pattern selection device provided on the surface of the sewing machine frame 1 for selecting a desired sewing pattern using a selection key 67. The selection key is electrically connected to an arithmetic unit 74 with a memory mounted in the sewing machine frame 1. As shown in FIG. 9, the arithmetic unit with the memory adjusts the stitching pattern generation information for instructing the amplitude and feed amount of the needle for controlling the relative position between the needle and the cloth, and the confounding position of the upper and lower threads. Sewing pattern storage device 69 of a read-only memory (ROM) for storing thread tension adjustment information for each stitch formation
A selected pattern storage device 70 of a read / write memory (RAM) for storing the selected sewing pattern generation information and the thread tension adjustment information of the upper and lower threads in a selected order, and the needle bar amplitude according to each information output. A sewing pattern generating device 71 composed of a stepping motor 14 and a feed adjusting stepping motor 25, a joint device 72 for upper thread strength, and an adjusting device 73 for lower thread strength are connected to a central processing unit 74. .

Next, formation of a seam in this embodiment will be described.

First, a desired sewing pattern is selected by the sewing pattern selection device 66. In the case where the sewing pattern is selected from, for example, a series of flower patterns shown in FIG. 10, the solid line indicates the upper thread 5 and the dotted line indicates the lower thread 47. For example, a red color thread is used as the upper thread, and a green color thread is used as the lower thread. Therefore, the pattern shown in FIG. . The sewing pattern generation information and the upper / lower thread tension adjustment information are read from the sewing pattern storage device according to the selection signal, and are stored in the selected pattern storage device 70 by operating the storage key 75. If it is desired to form the next pattern following the selected pattern, the next sewing pattern is stored in the selected pattern storage device 70 using the selection key by the same means.

After a desired sewing pattern is selected and stored, the drive shaft 2 connected to the drive source is rotated by a sewing command to detect the rotation phase of the drive shaft 2 in conjunction with the drive shaft. The sewing pattern generation device and the upper and lower thread tension adjustment information are read from the selected pattern storage device 70 in accordance with the detection signal of the device, and the sewing pattern generation device is read out.
71, the upper yarn strength adjusting device 72, the lower yarn strength adjusting device
The control signal is output to 73. According to the control signal, the sewing pattern generating device drives the needle bar amplitude stepping motor 14 and the feed adjusting stepping motor 25, and furthermore, the upper thread strength adjusting device 72 and the lower thread strength adjusting device. Drive 73 and. The thread tension is adjusted by adjusting the upper thread strength adjusting device 72 and the lower thread strength adjusting device 73 so that the upper and lower thread stitches are entangled as shown in FIGS. It is possible. The stitch "a" is a conventional thread tension balance generally used, in which the entanglement position of the upper thread 5 and the lower thread 47 is formed from the middle of the cloth to the back side of the cloth, and the upper thread strength is adjusted. By making the rotation amount of the drive roller 33 of the adjusting device 72 relatively larger than the amount set according to the sewing conditions, the supply amount of the upper thread supplied by the drive roller and the driven roller is increased, and the upper thread strength is increased. At the same time, the lower thread strength adjusting device 73 rotates the stepping motor 63 to rotate the adjusting cam 59 to the position shown by the dotted line in FIG. Since the set position is such that the cam groove 59a of the adjusting cam 59 has a small inclination, the interlocking of the forked rod 55 caused by the rotation of the cam 54 causes the pin 55b fixed in the middle of the forked rod.
Of the link 56 connected to the tip of the bifurcated rod 55 is reduced to reduce the amount of swing of the link 56 and to feed the lower thread feeding lever 51 through the feeding shaft 52.
The range of operation of the inner hook is shown in FIGS.
The lower thread pull-in amount between c and the lower thread guide plate 50, that is, the lower thread feed-out amount is made smaller and the lower thread strength is made stronger, so that the upper thread strength is made weaker. At the same time, the entangled position of the seam of the upper and lower threads is set between the middle of the thickness of the cloth and the back side of the cloth to obtain the seam of FIG.

As shown in FIG. 11c, the lower thread 47 is completely drawn out to the surface of the cloth, and the thread tension adjustment pattern for drawing the upper thread 5 on the line is as follows. Are formed in a straight line. For the upper thread, the amount of rotation of the drive roller 33 of the upper thread strength adjusting device 72 is made smaller than the amount set according to the sewing conditions, and the lower thread strength adjusting device 73 is adjusted. Rotates the stepping motor 63 to rotate the adjusting cam 59 to set it at the position shown by the solid line in FIG.
Since the set position is such that the inclination of the cam groove 59a of the adjusting cam 59 is large, the momentum of the forked rod 55 generated by the rotation of the cam 54 causes the movement of the pin 55b fixed to the middle of the forked rod to move the adjusting cam 55b. The link 56 connected to the tip of the bifurcated rod 55 by being guided by the cam groove 59a of 59
8a to 8c, the operating range of the lower thread feeding lever 51 is set to be between the wall 49c of the inner shuttle 49 and the lower thread guide plate 50 via the feeding shaft 52. By increasing the lower thread pull-in amount, that is, the lower thread feeding amount, the lower thread strength is reduced. The entanglement position of the stitches of the upper and lower threads is minimized with the degree of exposure of the upper thread on the surface of the cloth, in addition to the fact that the strength of the upper thread is increased.

In addition, as for the handling of the lower thread 47 of the seam in which the upper thread 5 and the lower thread 47 are arranged on the surface of the cloth as shown in FIG. 11b, the lower thread strength was weakened similarly to the seam of FIG. 11c described above. The strength of the upper thread is obtained by setting the upper thread supply amount between the case in FIG. 11c and the one in FIG. 11a. In order to facilitate understanding of the adjustment state of the thread tension, a description will be given using a sewing pattern as shown in FIG. The sewing pattern shown in FIG. 12a is one in which a sewing pattern is formed by using the upper thread on the same cloth table as that of the related art, and each needle drop position obtained by adjusting the needle bar amplitude stepping motor 14 is obtained. The thread tension is formed in order from 1 in the state of FIG. 11a by the upper thread 5 shown by a solid line between the needle drop positions, and the seam entanglement position of the upper and lower threads is arranged in the cloth or on the back of the cloth. .

The stitch pattern shown in FIG. 12c is obtained by adjusting only the stitch entanglement position of the upper and lower threads to the state shown in FIG. 11c with respect to the needle amplitude adjustment and the feed adjustment which are the formation information of the same sewing pattern. This is formed by the upper thread 5 shown and the lower thread 47 shown by a dotted line in the figure.

When the sewing pattern is formed by upper and lower threads on the cloth surface as shown in FIG. 12b in the middle, the upper and lower threads are adjusted as shown in FIG. And a lower thread indicated by a dotted line in the figure, a sewing pattern is formed. Regarding the formation of this sewing pattern, in all of FIGS. 12a, 12b and 12c, each sewing pattern is displayed and selected in a state where the formation information of the sewing pattern and the adjustment information of the thread tension are combined in advance. The information is stored in a possible combination, and does not select the thread tension adjustment information for the selection of the sewing pattern. Similar examples are shown in FIGS. 10a, b and c, respectively. In the figure, w indicates the amplitude of the needle bar. These can be formed by adjusting patterns of upper and lower threads stored in advance corresponding to the sewing patterns. Note that it is possible to store in advance so that the adjustment pattern of the upper and lower threads is changed for each needle drop in the sewing pattern in the drawing.
Although it is possible to use only the upper thread as shown in FIG.
Even when the lower thread is pulled up to the cloth surface as shown in FIG. C, the upper thread remains linearly. As an example obtained by changing the color in one sewing pattern, in the sewing pattern of FIG. 13a, portions indicated by solid lines in the drawing, that is, numbers 1 to 5 and 13 in FIG.
11 to 17 are used to adjust the adjustment pattern of the upper and lower threads so that the upper thread 5 and the lower thread 47 are entangled as shown in FIG. 11a. The stitches up to 13 are formed by adjusting the upper and lower thread adjustment patterns from the lower thread as shown in FIG. 11a, as shown in FIG. By adjusting the adjustment pattern, a two-color pattern consisting of upper and lower threads of different colors is formed. Also, FIG. 13b shows a flower portion, that is, the shapes of the numbers 5 to 15 are different from the shape of the flower portion in FIG. 13a, but this is also the same example as FIG. 13a. In the pattern of FIG. 13c, one sewing pattern is divided into several blocks, and the adjustment pattern of upper and lower threads is changed for each block. The adjustment pattern of the upper and lower threads is shown in FIG.
As shown in FIG. 11c, the blocks of d, e, f, and g are formed by only the upper thread on the cloth surface as in the entangled position between the lower thread 47 and the lower thread 47. It is formed by using an upper and lower thread adjustment pattern.

In this manner, the one stored in advance so as to adjust the adjustment pattern of the upper and lower threads corresponding to each stitch formation in one sewing pattern, and the one stored in the entire sewing pattern as adjusted by the adjustment pattern of one upper and lower thread The operation information of the pattern generating mechanism for the sewing pattern and the adjustment information of the adjustment pattern of the upper and lower threads are combined and read out from the stored pattern storage device and stored by the selection operation of the selection device by the selection device. , A sewing pattern generating device according to a sewing command. By adjusting the amplitude and the feed of the needle bar and driving the adjusting devices for the upper thread strength and the lower thread strength, a sewing pattern of two-color sewing can be formed by combining upper and lower threads of different colors.

Next, a second embodiment of the present invention will be described with reference to FIG. 14 and FIG. As shown in FIG. 14, the present embodiment differs from the first embodiment shown in FIG. 1 in that a thread tension selecting device for selecting a thread tension adjustment pattern indicated by reference numeral 79 in the figure is provided independently. Is different. That is, in the first embodiment, the operation information of the pattern generating mechanism and the adjustment information of the thread tension adjustment pattern of the upper and lower threads are stored in the storage device 69 of the sewing pattern in a combined state. Selects a sewing pattern in a combined state, but in this embodiment, as shown in FIG. 16, a storage device 80 of operation information of a pattern generation mechanism of a sewing pattern and a thread tension adjustment pattern of upper and lower threads. And a thread tension adjustment information selection device 79 for selecting adjustment information of the upper and lower thread adjustment patterns together with a pattern selection device 66 for selecting the respective storage information. Thus, the selection device 66 for the storage device 69 of the sewing pattern including the thread tension adjustment information can be selected with a small number of pattern displays. In FIG. 14, reference numeral 79 denotes a device for selecting pattern generation information of a sewing pattern, and as shown in FIG. 15, a device for selecting an adjustment pattern of upper and lower threads indicating an interlacing pattern of upper and lower threads to be formed, “A”, “b”, and “c” shown in the selection device correspond to the entanglement patterns of the upper and lower yarns in FIGS.

The configuration of the other parts in the second embodiment is the same as that of the first embodiment, and the description is omitted.

Next, two-color sewing using this apparatus will be described with reference to FIG. A different color thread is attached to the upper thread and the lower thread, respectively. Next, a desired sewing pattern is selected by the sewing pattern selection device 66. Here, the case where the pattern of FIG. 12 is selected will be described. The generation information of the sewing pattern and the code representing the nature of the sewing pattern are read from the storage device 80 of the sewing pattern by a signal from the sewing pattern selection device, and the pattern selected by the code is used to adjust the interlacing position of the upper and lower threads. The central processing unit 74 determines whether the pattern is possible or not, and if it is possible, turns on a display device such as an LED that indicates that the thread tension pattern can be adjusted by the upper and lower thread adjustment pattern selection device shown in FIG. This is indicated by lighting the device. Since the shape of the sewing pattern is greatly changed by changing the thread tension adjustment pattern, it is stored as non-adjustable. When the sewing pattern is selected, only the selected sewing pattern and the thread tension adjustment pattern a are displayed by a lighting device such as an LED, and the readout of the pattern generation information and the thread tension adjustment pattern is performed by operating the storage key 75. Is stored in the storage device 70 in a state where the adjustment information of a is combined.

When the selected pattern is a pattern in which the interlacing position of the upper and lower threads is adjustable, a display device 82 indicating that the thread tension pattern is adjustable.
Is turned on, and the thread tension adjustment pattern a of the thread tension selecting device is displayed. If it is desired to change to an upper / lower thread adjustment pattern other than a, the thread tension adjustment pattern selecting device 79
Is operated to select b or c so as to be displayed. Then, the pattern generation information and the selected upper and lower thread adjustment information are combined by the storage key 75 and stored in the storage device 70. When the sewing pattern is further stored, the pattern generation information and the upper and lower thread adjustment information are read from the storage device 70 by the same sewing command as described above, and the sewing pattern generator 71 and the upper thread strength adjustment device are read out.
72, adjusting the lower thread strength adjusting device 73, respectively, Fig. 12
A sewing pattern is formed by two-color sewing of an upper thread and a lower thread having different upper and lower thread interlacing positions as shown in a, b, and c.

In both the first and second embodiments, the upper thread strength is adjusted by using an upper thread supply amount adjusting device. However, as shown in FIGS. 18 and 19, a pair of yarns for holding the upper thread is used. An electrically controlled upper thread tensioner of a type in which the pressing force of the tension discs 83a and 83b is increased only when the strength of the upper thread is increased may be used, or a known electric thread tensioner may be used. good. Also, a device for adjusting the lower thread tension in a stepwise manner may be used as a lower thread strength adjusting device. The lower thread strength adjusting device will be described with reference to FIGS. Reference numeral 84 denotes an inner hook of a horizontal hook, which holds a bobbin winder 48 holding a lower thread 47 inside. The bobbin thread 47 from the bobbin winder is guided through a slit formed in the wall 84a of the inner hook 84 and is drawn out from between the wall 84a and the lower thread pushing spring 85 fixed to the inner hook 84, so that the needle plate 18 From the needle hole 18a to the needle plate. The lower thread pressing spring 85 is adjusted by an adjusting screw 86 to press the lower thread 47 with the wall 84a to urge the lower thread tension. Reference numeral 87 denotes a slide piece which is axially movably fitted in a hole provided in the inner hook 84, and is set at two positions, a position shown in FIG. 20 and a position shown in FIG. A hole 87a that can hold an auxiliary panel 88 is provided at the tip of the slide piece, one end of the auxiliary spring abuts the bottom of the hole 87a of the slide piece 87, and the other end is the lower thread pusher. The pressing force against the lower thread 47 is increased by contacting the back surface of the spring 85. Further, the slide piece 87 is urged in the direction opposite to the arrow C by the urging of the auxiliary spring 88, and the flange 87b of the slide piece 87 is
It is positioned in contact with 4b.

FIG. 21 shows the position where the slide piece has moved in the direction of arrow C. The position of the bottom of the hole 87a of the slide piece 87 has been advanced in the direction of the lower thread pushing spring 85. The spring pressure of the auxiliary spring 88 is higher than that in FIG. 20, and presses the lower thread pressing spring 85 to reduce the pressing force on the lower thread 47 between the lower thread pressing spring and the wall 84a. It is stronger than at the time of the figure.

A magnet 89 is embedded and fixed to the slide piece 87 on the side opposite to the hole 87a, and is located outside the inner hook 84 and at a distance having a clearance between the upper thread and the slide piece 87. An operating pin 90 is provided at a position corresponding to 87.

The setting of the slide piece 87 to the two positions shown in FIGS. 20 and 21 will be described with reference to FIG.

A groove 87c is provided on the outer periphery of the slide piece 87, and the tip of a pin 91 that can be inserted into and retracted from the inner hook 84 is fitted into the groove 87c. A spring 92 is provided at the rear end of the pin, and the tip of the pin 91 is always in contact with the bottom of the groove 87c.

When the pin 91 is located at (a) in the groove a is the position shown in FIG. 20, the slide piece 87 is movable in the axial direction, and the collar portion 87a is moved by the auxiliary spring 88. It is positioned in contact with the step 84b. At this time, the distance between the tip 90a of the operating pin 90 located outside the inner hook 84 and the magnet 89 is LA. For the movement to the position shown in FIG. 21, the operating pin 90 is pushed in the direction of arrow C, and the movement of the slide piece 87 moves the pin 91 from the groove a to the groove b of the groove 87c. The groove b is deeper with a step at a position (b) than the groove bottom at the last part of the groove a. When the pin 96 moves to the groove b, the pin comes into contact with the groove bottom of the groove b. And guides the groove b. The operating pin 90
However, after the pin 91 has brought the slide piece 87 to the position (b) of the groove b, the operating pin 90 retreats in the direction opposite to the arrow C and returns to the initial position shown by the solid line. The slide piece 87
Moves in the direction opposite to the arrow C by the bias of the auxiliary spring 88, and the pin 91 moves from the groove b to the groove c in FIG.

The groove and the pin are in contact with each other at the position (c) of the groove c, and the slide piece 87 is positioned as shown in FIG. The distance between the tip 90a of the operating pin 90 and the magnet 89 at that time is L
B. (C) at the bottom of the groove c of the groove 87c is the groove B.
Is lower than the bottom of the groove with a step.

Therefore, the operating pin 90 is then moved to the position shown in FIG.
Moves in the direction of arrow c, and the tip 90a and the slide piece 87 move.
When the slide piece 87 is moved and the slide piece 87 is moved, the slide piece 87 is guided to the groove 91 by the groove c and reaches the position (d) of the groove d. Since the bottom of the groove d is lower than the groove immediately before the groove c, the actuating pin 90 then retreats in the direction opposite to the arrow c and returns to the initial position. Then, the slide piece 787 is retracted in the direction opposite to the arrow c by the bias of the auxiliary spring 88, and the slide piece 87 is guided by the pin 91 on the groove d and is located at the position (e) of the groove a. . Since the groove bottom of the groove a is lower than the last groove bottom of the groove d with a stepped portion, the first position where the collar portion comes into contact with the bias of the auxiliary spring 88 (a). Leads to.

In this manner, the urging force of the auxiliary spring 88 is adjusted in two steps by the movement of the slide piece 87, and is added to the pressing force of the lower thread pushing spring 85, thereby lowering the lower thread tension between a strong state and a weak state. It is adjusted in stages. A hole element 93 electrically connected to the central processing unit 74 is buried at the tip of the operating pin 90, and a magnetic permeable film covers the upper part so as to prevent direct contact. The LA and LB of the gap between the tip of the operating pin 90 and the magnet 89 are detected by the built-in Hall element 93 in a non-contact manner, and as an adjustment state of the lower thread strength, the adjustment instruction of the central processing unit is given. Used as judgment data.

(Effects) As described above, according to the present invention, the thread tone of the upper and lower threads is changed for each pattern by using threads of different colors for the upper thread and the lower thread, or for a specific seam of the pattern. A variety of different patterns can be formed. In the present invention, by controlling the lower thread in addition to the control of the upper thread in order to change the thread condition of the upper and lower threads, when the lower thread is pulled up to the cloth surface, the cloth shrinkage particularly occurring in a thin cloth. Can be formed.

[Brief description of the drawings]

Drawings relate to an embodiment of the present invention, FIG. 1 is an external view of a sewing machine of a first embodiment, FIG. 2 is an explanatory view of a driving mechanism of the sewing machine,
FIG. 3 is an explanatory view of an upper thread supply device, FIG. 4 is an explanatory view of a calculating device of an upper thread supply amount, FIG. 5 is an explanatory view of a support structure of a driven roller, and FIG. FIG. 7, FIG. 7 is an explanatory view of an adjustment state, FIG. 8 is an explanatory view of a lower thread control state, FIG. 9 is an explanatory view of a thread tension adjustment arithmetic circuit, FIG. 10 is an explanatory view of a two-color sewing pattern, FIG. 11 is an explanatory diagram of a thread tension adjustment pattern showing an interlaced position of upper and lower threads in a sewing pattern, FIG. 12 is an explanatory diagram of a relationship between the sewing pattern and the thread tension adjusting pattern, and FIG. 13 is an explanatory diagram of a two-color sewing pattern. FIG. 14 is an external view of a sewing machine according to a second embodiment, FIG. 15 is an explanatory view of a device for selecting a thread tension adjustment pattern,
FIG. 16 is an explanatory diagram of a thread tension adjustment arithmetic circuit, FIG. 17 is an explanatory diagram of a sewing operation, FIGS. 18 and 19 are explanatory diagrams of an upper thread strength adjusting device, and FIGS. 20 and 21 are lower diagrams. FIG. 22 is an explanatory view of a yarn strength adjusting device, FIG. 22 is an explanatory view of an adjusting state, FIG. 23 is a detailed view of the adjusting device, 5 is an upper thread, 17 is a needle, 47 is a lower thread, and 28 is a needle thread capturing means Shuttle, 69 is a sewing pattern storage device, 66 is a sewing pattern selection device, 71 is a sewing pattern generation device, 72 and 73 are thread tension adjusting devices, 67 is a selection key as selection means, and 80 is a first key. A storage device for a sewing pattern as storage means, 81 is a storage device for thread tension adjustment information as a second storage device, and 79 is a device for selecting a thread tension adjustment pattern.

Claims (2)

(57) [Claims] A stitch forming means including a needle for holding an upper thread and moving up and down, a needle thread catching means for holding a lower thread and cooperating with the needle, a storage device for a sewing pattern, and the sewing pattern In the sewing machine provided with the selection device, the sewing pattern generation device, and the thread tension adjusting device, the generation information of the sewing pattern stored in the storage device is used to determine the relative movement between the needle and the material when forming the sewing pattern. The thread tension adjustment pattern for forming the sewing pattern formed on the table of the material and the pattern generation information indicating the amount with the upper thread only, and exposing the lower thread on the table of the material, and using the upper thread and the lower thread Adjusting at least one or more of the upper thread and the lower thread of the thread tension adjusting device to achieve at least two or more thread tension adjusting patterns with the thread tension pattern to be formed; And memorize in combination with the thread tension adjustment information Ri, wherein the selection device dichroic stitch sewing machine, characterized in that it comprises a selection means for selecting a state that combines with the sewing pattern generation information and the thread tension adjustment information. 2. A stitch forming means including a needle for holding an upper thread and moving up and down, a needle thread catching means for holding a lower thread and cooperating with the needle, a storage device for a sewing pattern, and the sewing device. In a sewing machine provided with a pattern selecting device, the sewing pattern generating device, and a thread tension adjusting device, the storage device indicates a relative movement amount between the needle and the material for forming a sewing pattern. A first storage device storing information on the occurrence of the above and a thread tension pattern for forming a sewing pattern formed on the table of the material only with the upper thread, and exposing the lower thread to the table of the material to thereby form the upper thread A second storage device that stores thread tension adjustment information including at least two thread tension adjustment patterns of a thread tension adjustment pattern to be formed by the thread tension adjustment pattern, and selection of the thread tension adjustment pattern. A two-color sewing machine comprising a device.