JPH0489089A - Two-color sewing machine - Google Patents

Abstract

PURPOSE:To improve the sewing data generating efficiency by closing or opening a switch for two-color sewing or one-color sewing, and judging the thread delivery quantity indicating data respectively. CONSTITUTION:A sewing pattern is selected in advance, and one-color sewing or two-color sewing is selected in advance. A switch 4 is closed or opened in response to two-color sewing or one-color sewing in advance. The sewing data stored in response to the sewing patterns are read out respectively from a pattern generator 1 every time main spindle pulses are inputted, and the read sewing data are judged by a judging unit 2 on whether they are the sewing data at individual sewing points or the thread delivery quantity indicating data. If the judging unit 2 judges the sewing data as the sewing data at sewing points, a pattern sewing system 8 is driven based on the thread quantity and the sewing data at the sewing points, and the pattern is sewn. The sewing pattern can be sewn in one-color sewing or two-color sewing as required, and the sewing data generating efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pattern stitch sewing machine, and particularly to a two-color stitch sewing machine that sews a pattern on cloth using two-color threads.

[Conventional technology]

Conventionally, this type of sewing machine uses threads of different colors for the upper thread and lower thread, and changes the thread payout amount of the upper thread in a predetermined sewing area so that the lower thread appears on the fabric. In the sewing area, the upper thread is sewn with the normal thread payout amount so that the upper thread appears on the fabric, and the pattern is sewn using two colors: the upper thread and the lower thread.

However, in such a two-color sewing machine, in order to automatically sew a two-color pattern, the sewing data of the sewing pattern includes thread amount data that instructs the thread payout amount in advance.

Therefore, when sewing the same pattern in one color, sewing data for one color is required, and on the other hand, when sewing the same pattern in two colors, sewing data for two colors is required. . For this reason, it is necessary to create sewing data for one-color sewing and two-color sewing for the same pattern, which has the drawback of poor sewing data creation efficiency.

[Problem to be solved by the invention]

The present invention improves this point, and aims to provide a two-color sewing machine which can sew a sewing pattern in either one-color or two-color sewing using two-color sewing data of the sewing pattern.

Means for Solving Problem C] The present invention is configured to include means for validating or invalidating thread feed amount instruction data for two-color sewing included in sewing data.

[Effect]

Therefore, using one piece of sewing data, a sewing pattern can be sewn in one color or in two colors as required.

〔Example〕 An embodiment of the present invention will be described based on the drawings.

FIG. 1 shows a block diagram of essential parts of an embodiment of the present invention.

In FIG. 1, the main axis pulse is input to a pattern generator 1, and the output of this pattern generator 1 is connected to a discriminator 2. The output of this discriminator 2 is connected to a selector 3 for yarn payout amount instruction data and a pseudo pulse generator 7. Furthermore, the output of the discriminator 2 is connected to a general pattern sewing mechanism 8. The output of the selector 3 is connected directly or via a switch 4 to an automatic thread tension calculation type selection device 5, and the output of the automatic thread tension calculation type selection device 5 is connected to an automatic thread tension calculation type selection device 6.

FIG. 2 shows a flow chart of one embodiment of the present invention.

Figure 3 shows the sewing pattern shown in Figure 4 using white for the upper thread and red for the bobbin thread, and in the case of two-color sewing, the ■■ section is white, the ■■ section is red, the ■■ section is white, ■■ Sewing data for sewing sections in red and sewing the entire section in white in the case of one-color sewing is shown.

In Fig. 3, code A indicates the thread payout amount instruction data that indicates the needle thread payout amount for normal sewing where the needle thread (white) appears on the fabric, and coat B indicates the thread payout amount instruction data that indicates the needle thread payout amount for normal sewing where the needle thread (white) appears on the fabric.
This shows thread payout amount instruction data that indicates the needle thread payout amount such that . Sewing data for each sewing point is written after each code.

In the following description, the yarn payout amount will be simply referred to as "yarn amount" if necessary.

〔motion〕

The characteristic operation of one embodiment of the present invention configured in this way will be explained.

First, a case where the sewing pattern shown in FIG. 4 is sewn in two colors will be described.

The operator selects a sewing pattern (in this example, the sewing pattern shown in FIG. 4) in advance.

Furthermore, the operator selects one-color sewing or two-color sewing in advance. That is, in the case of two-color sewing, the switch 4 is closed in advance. This is a feature of the present invention.

In this state, each time the main axis pulse is input, the pattern generator l
Each of the sewing data (in this example, the sewing data shown in FIG. 3) stored in correspondence with the sewing pattern is read out (blocks 11 and 12 in FIG. 2, hereinafter simply referred to as "blocks").

).

The sewing data is determined by the discriminator 2 to be sewing data for each sewing point or thread payout amount instruction data (block 13). Third
The first sewing data of the sewing data in the figure is code A.
The discriminator 2 discriminates, and the code is sent to the discriminator 3, where it is discriminated whether it is code A (block 14).

If it is code A, it is directly sent to the automatic thread tension calculation formula selection device 5, where the thread amount calculation formula that indicates code A is selected, and based on the calculation result. Then, the automatic thread tension device 6 or code A is set to pay out the upper thread amount specified by the code A (block 15).

Furthermore, when the discriminator 2 discriminates the code, a pseudo pulse is generated in the pseudo pulse generator 7, and the pattern generator 1 is activated again, and while the next main axis pulse is input, the next sewing data, that is, the first stitch in the section is Generates sewing data for sewing points.

When the discriminator 2 determines that the data is sewing data or sewing data of a sewing point, the pattern sewing mechanism 8 is driven based on the thread amount and the sewing data of each sewing point, and the pattern is sewn (block 12.13).
．． 16). Section ■■ is sewn using the upper thread (white) in a similar manner (blocks 11 to 13.16).

When code B is generated from pattern generator 1, it is detected by discriminator 2 and sorter 3 (blocks 11 to 1).
14). Since the switch 4 is closed, the code B is input to the automatic thread tension calculation formula selection device 5, and the automatic thread tension calculation formula selection device #5 selects the code B or the specified thread amount calculation formula. Based on the calculation result, the automatic thread tension device 6 or code B is set to pay out the specified upper thread amount (block 18). In this state, an operation similar to the above-mentioned operation is performed to sew section 2 with the bobbin thread (red) exposed on the fabric (blocks 11 to 13.16).

The same operation is then repeated, and according to the sewing pattern or sewing data, ■■ section or white, ■■ section or red, ■■ section or white, ■
■The section is sewn in two colors: red.

Next, a case where the sewing pattern shown in FIG. 4 is sewn in one color using the sewing data shown in FIG. 3 will be described.

In the case of one-color sewing, the switch 4 is opened in advance.

This is a feature of the present invention.

In this state, similar to the above-described operation, each time a main axis pulse is input, each piece of sewing data stored corresponding to a sewing pattern is read out from the pattern generator 1 (plotters 11 and 12).

The sewing data is determined by the discriminator 2 to be sewing data for each sewing point or thread payout amount instruction data (block 13). Third
The first sewing data of the sewing data in the figure is code A.
The discriminator 2 discriminates this, and the code is sent to the discriminator 3, where it is discriminated whether it is code A (block 14).

If it is coat A, it is directly sent to the automatic thread tension calculation formula selection device 5, where the automatic thread tension calculation formula selection device 5 selects either the code A or the specified thread amount calculation formula, and based on the calculation result. Then, the automatic thread tension device 6 or code A is set to pay out the upper thread amount as instructed (block 15).

Next, the sewing data is read from the pattern generator l, and when the discriminator 2 determines that the sewing data is sewing data of a sewing point, the sewing data is read out from the pattern sewing mechanism 8 based on the thread amount and the sewing data of each sewing point. The sewing machine is driven, and section ■■ is sewn using the upper thread (white) in the same manner as described above (blocks 11 to 13.16).

When code B is generated from the pattern generator 1, it is detected by the discriminator 2 and the sorter 3 (blocks 11 to 3).
14).

However, in the case of one-color sewing, since the switch 4 is open, the code B is not input to the automatic thread tension calculation formula selection device 5, and the automatic thread tension calculation formula selection device 5 inputs the previously input code. The thread amount calculation formula instructed by code A is kept selected, and the automatic thread tension device 6 is also kept set to pay out the upper thread amount instructed by code A, and the operation is similar to that described above. Section ■■ is sewn with needle thread (white) (blocks 14.17.11 to 13.16).

The same operation is repeated thereafter, and the sewing pattern is sewn in one color.

In this case, the discrimination between codes A and B is achieved by, for example, using an arbitrary hit of the bit-structured code as a discrimination hit.

In addition, in the above embodiment, the code B indicates thread let-out amount instruction data that instructs one type of upper thread let-out amount such that the bobbin thread (red) is exposed on the fabric, but two types of upper thread amounts are specified. Therefore, code B is configured to include two types of codes B1 and B2, and when the switch 4 is ON, code B is input to the automatic thread tension calculation formula selection device 5, and when it is OFF, code B2 is automatically input. It may be configured such that it is input to the thread tension calculation formula selection device 5. As a result, code B is able to reduce the yarn payout amount instructed by code B1 than code B2.

As explained above, according to the present invention, two-color stitching with more bobbin thread appearing on the fabric than sewing with code B2 is performed. It is configured to include a means for validating or invalidating the thread amount instruction data for the purpose of use.

Claims (1)

[Scope of Claims] 1. First thread payout amount instruction data that indicates the needle thread payout amount for normal stitching in which the needle thread appears on the fabric, and needle thread payout such that the bobbin thread appears on the fabric together with the needle thread. 2nd to indicate the amount
In a two-color sewing machine that sews a sewing pattern in two colors according to sewing data including thread payout amount instruction data, an instruction means for instructing one-color sewing or two-color sewing, and the first and second threads. Selecting the thread feeding amount instruction data, and when the instruction means instructs one-color sewing, invalidating the second thread feeding amount instruction data and outputting the first thread feeding amount instruction data; selecting means for outputting the second thread pay-out amount instruction data when the instruction means instructs two-color sewing; and setting a thread pay-out amount in response to the thread pay-out amount instruction data output from the selecting means. A two-color sewing machine comprising: a thread tension setting means; and a sewing mechanism for sewing a sewing pattern with the thread tension set by the thread tension setting means.