JP2837009B2 - 2-color sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-color sewing machine having a function of sewing a selected pattern on a cloth with two-color threads.

[0002]

2. Description of the Related Art Conventionally, as a sewing machine of this type, different colors of yarns are used for an upper thread and a lower thread, and by changing a feeding amount of an upper thread in a predetermined sewing area, a selected pattern can be obtained. There is a two-color sewing machine which has a function of selectively sewing between a normal stitch that appears on a cloth and a two-color stitch where a lower thread appears on the cloth.

[0003] In such a conventional two-color sewing machine, sewing data of various patterns that can be selected include thread amount data indicating the feeding amount of the upper thread, respectively, and one-color sewing is performed for one pattern. Sewing data for two-color sewing and sewing data for two-color sewing are required, so that the efficiency of creating sewing data is low.

In addition, for example, when it is desired to alternately perform normal sewing and two-color sewing alternately as shown in FIG. 8, conventionally, the following six operations are required as shown in FIG. Pattern selection → Memory switch ON → Pattern selection → 2
Color key ON → Memory switch ON → Continuous key ON That is, a pattern is selected, the sewing data for one-color sewing is stored in the memory, the same pattern is selected again, and two-color sewing is designated, and the two-color sewing is designated. The sewing data is stored in the memory, and further, the continuous sewing is designated and the fact that the one-color sewing and the two-color sewing based on the both sewing data stored in the memory are alternately and continuously performed is stored.

[0005]

However, in such a conventional two-color sewing machine, not only the efficiency of creating sewing data is poor, but also it is desired to perform normal sewing and two-color sewing alternately and continuously as described above. In such a case, there is a problem that the operation is cumbersome and an operation error easily occurs. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and simplifies an operation in a case where normal sewing and two-color sewing of a selected pattern are alternately and continuously performed, and facilitates creation of sewing data. With the goal.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention uses a different color yarn for the upper yarn and the lower yarn to change the amount of the upper yarn to be drawn, thereby changing the selected pattern. In a two-color stitch sewing machine having a function of selectively sewing with a normal sewing in which an upper thread appears on a cloth and a two-color sewing in which a lower thread appears on a cloth, a pattern selection key and a two-tone key are provided,
When the sewing is started after the pattern is selected by the pattern selection key and the two-tone key is operated, a continuous two-color sewing control means for alternately continuously performing the normal sewing and the two-color sewing of the selected pattern is provided. It is provided.

[0007] The continuous two-color sewing control means includes means for determining whether or not the two-tone key has been operated, and when it is determined that the two-tone key has been operated, the feed amount of the upper thread is reduced to a normal amount. It is preferable that the feed amount and the feed amount corresponding to the two-color code added to the sewing data of the selected pattern are alternately switched and set every time one pattern is sewn.

[0008]

In the two-color sewing machine according to the present invention, when a pattern is selected by the pattern selection key and the sewing is started after the two-tone key is operated, the continuous two-color sewing control means operates the pattern selection key. Is controlled so that the pattern selected by the normal sewing and the two-color sewing are alternately and continuously sewn, so that the operation before the start of the sewing is only two operations of the pattern selection operation by the pattern selection key and the operation of the two-tone key. ,
The operation is simple and there is almost no risk of mistakes.

Then, the continuous two-color sewing control means determines whether or not the two-tone key has been operated, and when it has been determined that the two-tone key has been operated, the pattern in which the threading amount of the upper thread is selected as the normal threading amount. The normal sewing and the two-color stitching can be performed by the same sewing data by alternately switching and setting the feeding amount corresponding to the two-color code added to the stitching data for each pattern.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 2 is a perspective view showing an example of the appearance of a two-color sewing machine according to the present invention. In FIG. 2, 1
Reference numeral denotes a sewing machine main body, reference numeral 2 denotes a bed, and reference numeral 3 denotes a needle bar which fixes a sewing needle 4 at a lower end thereof and moves up and down in conjunction with a main shaft (not shown). A moving body 5 that moves two-dimensionally in the X and Y directions is provided on the bed 2, and a cloth holder 6 having a substantially rectangular frame shape is attached to the tip of the moving body 5, so that the needle drop point falls within the frame. To

When the sewing machine is started, the moving body 5 includes an X-pulse motor and a Y-pulse motor, which will be described later, which are driven in accordance with a selected sewing pattern.
The needle moving point of the cloth, which is the workpiece to be sewn, held by the cloth holder 6 is moved along the sewing pattern by the Y moving mechanism.

An automatic thread tensioner 1 is provided on the upper front of the sewing machine body 1.
0 is provided, and four sets of thread tension trays 11 to 14 are arranged in a row in a row and covered with a cover 15. Then, the upper thread 7 is fed out from a bobbin (not shown) set outside the main body, guided to the automatic thread tensioner 10 via the thread guides 16 and 17, and passed between the push plates and the trays of the respective thread tension plates 11 to 14. Thereafter, the thread is guided downward through a hole of a balance 19 which projects through a slit of the sewing machine main body 1 via a thread guide 18 and moves up and down in conjunction with a main shaft (not shown), and passes through a hole at the tip of the sewing machine needle 4.

In this manner, the upper thread 7 is pulled out by the vertical movement of the balance 19 for each stitch, and at this time, tension is applied by the clamping force of the selected thread tension plate in the automatic thread tensioner 10. Is done. The bobbin thread is not shown, but is wound around a bobbin in the same manner as a conventional ordinary sewing machine, loaded into a bobbin case locked in a shuttle, fed out at every stitch, and out of the bobbin case. Drawn out.

An operation unit 20 is provided at the base of the sewing machine main body 1, and a pattern input section 21 and a function input section 2 are provided.
2, a start switch 23, a stop switch 24, and an LCD display 25 are provided. Pattern input unit 2
As shown in FIG. 3, pattern selection keys 21a and 21 of a number of key switches for selecting various sewing patterns are shown in FIG.
.. are arranged.

As shown in FIG. 3, the function input section 22 includes a keypad for selecting various functions such as a two-tone key 22a, a reduction key 22b, and an inversion key 22c. I have. The display 25 is also provided with a pattern display section 25a and a state display section 25b as shown in FIG.

Here, the automatic thread tensioner 10 in this embodiment will be further described. The four sets of thread tension trays 11 to 14 of the automatic thread tensioner 10 are each configured such that a push plate is provided on a tray by a coil spring interposed between a knob portion supported by a thread tension shaft (not shown) and a push plate. The tension is applied by pressing and urging the upper thread 7. The thread tension plate 11 has the weakest clamping force (corresponding to the tension) in advance, and 12, 13, and 14 in that order. It has been adjusted to be stronger.

That is, each of the thread tensioners 11, 12, 13,
Tensions by 14 respectively,
Then, the magnitude relation is as follows. Tension <tension <tension <tension Then, a floating air cylinder or solenoid is provided for each of the thread tension dishes 11 to 14 in the sewing machine main body 1, and the thread tension dishes 11 to 14 are controlled by controlling them.
Can be selectively enabled or disabled to change the tension applied to the upper thread. The higher the tension, the smaller the amount of needle thread to be fed out per stitch, and the lower the tension, the greater the amount.

Next, the configuration of a control system according to the present invention of the two-color sewing machine will be described with reference to the block diagram of FIG. The control of each part of the two-color sewing machine is performed by the CPU, the RO,
This is performed by a controller 30 using a microcomputer including an M, a RAM, an I / O unit, and the like.

The controller 30 receives ON / OFF signals of the key switches of the pattern input section 21 and the function input section 22 of the operation unit 20 and the key switches of the start key 23 and the stop key 24, respectively. A pattern data memory 31 storing sewing data of various selectable patterns (a two-color code indicating a needle thread feeding amount at the time of two-color sewing) is stored. A display data memory 32 storing display data to be displayed is connected. Each of these memories is a ROM or a RAM. In the case of a RAM, sewing data and display data of various patterns are loaded from a floppy disk or the like.

The output signal of the controller 30 controls the display on the display 25, and also controls the automatic thread tensioner 10 to set the upper thread feeding amount. The rotation of the sewing machine motor 34 is controlled, and the movement of the cloth holder 6 by the XY movement mechanism 35 is controlled.

Next, the operation according to the present invention mainly by the controller 30 in this embodiment will be described with reference to the flowcharts of FIGS. 6 and 7 and FIGS. 3 to 5. When the sewing machine starts, the controller 40 first accepts a pattern selection by the pattern input unit 21 as shown in FIG. 6, and when any one of the pattern selection keys is pressed (ON), the sewing data and the display data of the selected pattern are displayed. Pattern data memory 31
4 is read from the display data memory 32 and stored in the internal memory (RAM), and the selected pattern is displayed on the pattern display section 25a of the display 25 as shown in FIG. Thereby, the operator can confirm the selected pattern.

Next, function selection by the function input unit 22 is accepted, and one of the function selection keys is pressed (ON).
To determine whether the key is a two-tone key,
If so, at the start, the reset two-tone flag is set. If the key is not the two-tone key 22a, the flag of the function selected by another key is set. For example, when the inversion key 22c is pressed, the inversion flag is set. Then, the selected function is displayed on the status display section 25b of the display 25 as shown in FIG. The display data is stored in the internal memory (ROM) in advance. This display allows the operator to confirm the selected function.

Thereafter, when the start key 23 is pressed, sewing is started, but otherwise, pattern selection and function selection reception are repeated. Therefore, a plurality of patterns (for example, by using the pattern selection keys 21a and 21b) and a plurality of functions (such as "two-tone" and "reverse") can be selected.

When sewing is started, the routine proceeds to a subroutine shown in FIG. 7, in which a reversal flag is checked, and if it is set, the flag F is set to 1; otherwise, the flag F is set to 0. . Next, the flag F is checked. If F = 0, the automatic thread tensioner 10 is set to the normal sewing amount, and if F = 1, it is added to the sewing data of the selected pattern. Are set so that the feed amount corresponds to the two-color code.

Then, the selected pattern sewing is executed until one pattern is completed, and when one pattern is completed, the two-tone flag is checked. If the two-tone flag is set, the flag F is inverted (1 if 0, 1 if 0). If not, the process proceeds directly to the check of the stop key. 6 and the process ends.
If not, the flow returns to the check of the flag F, and according to the result, the feed amount of the upper thread is set again and the selected pattern sewing is executed by one pattern.

Therefore, when the two-tone flag is set, the flag F is inverted each time the pattern sewing is executed by one pattern, whereby the feeding amount of the upper thread is reduced by the feeding amount corresponding to the normal sewing and the feeding amount corresponding to the two-color code. The normal sewing and the two-color sewing can be alternately and successively performed one by one. If the reversal flag is not set, the sewing starts from the normal sewing at F = 0, and if the reversal flag is set, F = 1 at the beginning. Therefore, the sewing is started from the two-color sewing.

Then, for example, a white thread is used for the upper thread and a red thread is used for the lower thread, and only the thread-wound pattern is selected by the pattern selection key 21a in FIG.
When only the "two-tone" function is selected by a and the start key 23 is pressed, as shown in FIG. 5A, the normal pattern is first sewn in white, and then the same pattern is sewn in two colors in red. Thereafter, a thread-wound pattern is successively sewn alternately in white and red in this order.

When the "two-tone" function is selected after pressing the pattern selection key 21b after the pattern selection key 21a to select the pin-wound pattern and the diamond-shaped pattern, FIG.
As shown in (B), first, a thread-wound pattern is sewn in white by normal sewing, then a rhombic pattern is sewn in red by two-color stitching, and thereafter, in this order, a white thread-wound pattern and a red rhombus are sewn. The patterns are sewn alternately and continuously.

At this time, "reverse" is performed by the reverse key 22c.
When the function is also selected, first, as shown in FIG. 5C, the thread-shaped pattern is sewn in red by two-color stitching, then the rhombus-shaped pattern is sewn in white by normal sewing, and thereafter, the red thread-wound pattern is sewn in this order. Pattern and white rhombus pattern are alternately and continuously sewn.

Further, when the "two-tone" function is selected after selecting a plurality of patterns, the normal sewing and the two-color sewing are alternately performed in a unit obtained by combining the selected patterns. In this case, for example, two types of patterns as shown in FIG.
Sewing is performed in the order of red-red, white-white, or red-red, white-white, and red-red.

When the start key 23 is pressed without selecting a function, all the selected patterns are sewn in white by normal sewing, and when only "reverse" is selected in the function selection, All the selected patterns are sewn in red by two-color sewing. When "reduce" is selected, the selected pattern is reduced and sewn by normal sewing or two-color sewing.

As described above, according to this embodiment, by simple key operations, various continuous patterns such as alternate continuous sewing of normal sewing and two-color sewing of the selected pattern and its reverse sewing, normal sewing only, or only two-color sewing are performed. Sewing can be performed, and the sewing data of each pattern need only be one type of data to which a two-color code for designating the needle thread feeding amount at the time of two-color sewing is added.

As an automatic thread tensioner, an upper thread length required to form one stitch is calculated, and an actuator (not shown) is drive-controlled so as to pull out the upper thread length from the bobbin. Is also good. In addition, although an example in which the XY control device is used as the cloth feeder has been described, the cloth may be moved by moving the cloth feed teeth back and forth and left and right.

[0034]

As described above, according to the present invention, the normal sewing and the two-color sewing of the selected pattern can be alternately and continuously performed by the simple operation of only the pattern selection key and the two-tone key. The operability is improved, and the risk of erroneous operation is almost eliminated. Further, since it is not necessary to create separate sewing data for normal sewing and two-color sewing, the creation efficiency of sewing data is improved.

[Brief description of the drawings]

1 is a block diagram showing a configuration of a control system according to the present invention of the sewing machine of FIG. 2;

FIG. 2 is a perspective view showing an example of the appearance of a two-color sewing machine embodying the present invention.

FIG. 3 is a key arrangement diagram showing an example of a pattern input unit 21 and a function input unit 22 in FIGS. 1 and 2;

FIG. 4 is an explanatory diagram showing a display example of a display 25 in FIGS. 1 and 2;

FIG. 5 is an explanatory diagram showing a different example of alternate continuous sewing of normal sewing and two-color sewing of a selected pattern according to this embodiment.

FIG. 6 is a flowchart showing the operation of the controller of FIG. 1 according to the present invention in the embodiment of the present invention shown in FIGS. 1 and 2;

FIG. 7 is a flowchart of a subroutine “Sewing” in FIG. 6;

FIG. 8 is an explanatory diagram showing an example of alternate continuous sewing of normal sewing and two-color sewing.

FIG. 9 is an explanatory diagram of a key operation procedure in a case where a pattern is selected in a conventional two-color sewing machine and alternate continuous sewing of normal sewing and two-color sewing is performed.

[Explanation of symbols]

1 sewing machine 2 bed 4
Sewing needle 5 Moving body 6 Cloth holder 7
Needle thread 10 Automatic thread tensioner 11-14 Thread tension plate 19
Balance 20 Operation unit 21 Pattern input unit 22
Function input section 22a Two-tone key 23 Start key 24 Stop key 25 Display 30 Controller 31 Pattern data memory 32 Display data memory 33 Sewing motor drive part 34 Sewing motor 35 XY drive mechanism

Claims (2)

(57) [Claims] The present invention provides a sewing machine in which a selected pattern is formed by a normal sewing and a lower thread on a cloth by changing a feed amount of the upper thread by using different colored threads for the upper thread and the lower thread. In the two-color sewing machine having a function of selectively sewing by two-color sewing, a pattern selection key and a two-tone key are provided, a pattern is selected by the pattern selection key, and the sewing is performed after the two-tone key is operated. , A continuous two-color stitching control means for alternately and continuously performing the normal stitching and the two-color stitching of the selected pattern alternately. 2. The two-color sewing machine according to claim 1, wherein said continuous two-color sewing control means determines whether or not said two-tone key has been operated, and said means has operated said two-tone key. When it is determined, a means for alternately switching and setting the feeding amount of the upper thread between the normal feeding amount and the feeding amount corresponding to the two-color code added to the sewing data of the selected pattern by one pattern sewing is used. A two-color stitch sewing machine characterized by the following.