JPS6314998B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewing pattern forming device for a sewing machine, and particularly to effective use of a mirror image during pattern formation.

In industrial automatic sewing machines, etc., sewing is performed repeatedly along a desired sewing pattern many times, and the sewing pattern is stored in a pattern memory such as P-ROM in order to arbitrarily change this sewing pattern to a desired shape. When sewing, the sewing pattern in this memory is read out and the desired shape is efficiently sewn multiple times, and when the sewing pattern is changed, the contents of this P-ROM are changed according to the desired shape. There is. Such a sewing pattern generator is operated by drawing a desired sewing pattern on an input board and electronically writing it into a memory.

Normally, the sewing pattern of a sewing machine consists of a combination of relatively simple shapes, and especially in clothing, there are many sewing patterns that are symmetrical left and right, and for such symmetrical sewing patterns, a mirror image sewing pattern is used. A simplification of formation takes place. In other words, for a symmetrical pattern,
Only the right or left pattern is drawn on the input board, and the other half is symmetrically reversed through data processing, thereby making it possible to efficiently pattern the stitches.

The mirror image method is extremely effective when the input data is only stitch data, but in recent years, input data includes not only stitch data but also various mode data such as thread trimming, midway stop, etc. When specifying various modes such as inversion presser rotation and other various modes at the same time as stitching, there is a problem in that mirror image cannot process such mode data, and therefore inversion data cannot be formed using the desired mirror image. For example, even if only the stitches are reversed, if mode data such as thread trimming is stored as is on the reverse side, there is a drawback that the desired sewing cannot be performed, such as thread trimming being performed at the beginning of sewing. .

The present invention has been made in view of the above-mentioned conventional problems, and its object is to provide an improved sewing pattern generator for sewing machines that can utilize not only stitch data but also mode data by effectively utilizing the mirror image method. Our goal is to provide the following.

In order to achieve the above object, the present invention provides a sewing pattern generator for a sewing machine that writes a desired sewing pattern supplied from an input board into a pattern memory, which input data including stitch data and mode data from the input board. Controls writing to data memory and pattern memory.
It includes a CPU and a system program ROM that stores a program written by the CPU, and the system program ROM has a mirror image creation function that creates stitch data that is reversed around a predetermined axis with respect to stitch data of input data. The present invention is characterized in that it further has a mode conversion function that performs mode conversion required when stitch data is inverted with respect to mode data in input data.

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a pattern former according to the present invention, and FIG. 2 shows its internal circuit.
A tablet digitizer 10 forming an input board is provided at the front of the device, and a stylus pen 12 is provided.
By drawing the desired sewing pattern on the tablet, this is converted into an XY image signal.
Under the control of the CPU 14, the P-ROM writing circuit 16
P- to form a predetermined pattern memory through
It is written to the ROM as a sewing pattern signal. The P-ROM is installed in a P-ROM socket 18 provided on the rear surface of the digitizer 10. Various modes and other information at the time of this input are displayed on an LED display board 20. The CPU 14 converts the input data from the digitizer 10 into P-
The program for writing to the ROM is written in the system program ROM 22, and the CPU 14 performs processing according to this program.The input data from the digitizer 10 is temporarily stored in the data memory 24 consisting of RAM, and the CPU 14 performs processing according to this program. In the embodiment, the values are stored as relative value data indicating the XY coordinate data of the digitizer 10 by the amount of XY change of each stitch.

The input data of the digitizer 10 is stored in P-ROM.
A monitor display CRT26 is provided to monitor data when writing to the
Desired sewing patterns can be sequentially input from the digitizer 10 while viewing the monitor image on the CRT 26. In this embodiment, a random scan type CRT is used as the CRT 26,
Compared to normal raster scan type CRTs, it displays images with higher resolution and accurately displays even fine seams, and can simplify peripheral circuits such as video RAM, reducing the price of monitor equipment. can. A CRT controller 28 is provided to drive the CRT 26.
8 is supplied with control signals corresponding to the X and Y coordinates of the monitor image from an X data D/A converter 30 and a Y data D/A converter 32, respectively, and a brightness control signal from a brightness control circuit 34. There is.

In this embodiment, the sewing pattern monitor display on the monitor display CRT 26 is performed on the P-ROM.
The display memory 36 is operated by display data from a display memory 36 provided separately from the data memory 24 for the digitizer 10, and this display memory 36 stores input data from the digitizer 10 as absolute value data of XY coordinates.
Consists of RAM. The output of this display memory 36 is
2 latches 3 for each data and Y data
Converter 3 via 8, 40 and 42, 44
0, 32, and the brightness information is also supplied to the brightness control circuit 34, which allows the CRT controller 28 to create a monitor image faithful to the input data.
It can be drawn on CRT26.

In this embodiment, the random scan
In order to display images on CRT26 at high speed,
It is characterized in that data transfer from the display memory 36 to the CRT 26 is performed by a direct memory access method using a DMA controller separately from the CPU 14 that controls writing to the P-ROM, thereby improving image quality and preventing flickering and other problems. It is possible to do so. In the embodiment, display memory 36 is controlled by CPU 14 when writing input data from digitizer 10 and when transferring this written data to CRT 26.
The display memory 36 is controlled by the DMA controller 46, and for this purpose, the display memory 36 is commonly connected to the CPU 14 and the DMA controller 46. However, in order to make the control by both controllers independent, a separation gate 48 is connected to the common bus. It is provided.

A characteristic feature of the present invention is that the system program ROM 22 has a mirror image function for stitch data and a mode conversion function for thread trimming and other mode data, so that the system program ROM 22 has a mirror image function for stitch data and a mode conversion function for thread trimming and other mode data. The reason is that it is added to the mirror image, thereby making it possible to perform the correct sewing process.

The sewing pattern forming device according to this embodiment has the above-mentioned configuration, and the operation of writing input data from the digitizer 10 into the P-ROM will be briefly explained below.

When the operator draws a desired sewing pattern on the surface of the digitizer 10 with the stylus pen 12, the digitizer 10 captures this sewing pattern as an electrical signal on the XY coordinates, which is sent to the CPU 14.
is written into the data memory 24 as relative value data for each stitch. The CPU 14 reads the relative value data written in the data memory 24 based on the program in the program ROM 22.
The sewing pattern is supplied to the ROM writing circuit 16, whereby a desired sewing pattern can be written into the P-ROM.

At the same time as writing the P-ROM, in this embodiment, input data from the digitizer 10 is sequentially written.
Image can be monitored by CRT26,
This image monitor uses the data memory 2 for monitoring.
4, a display memory 36 and a random scan type CRT 26 are used, and a DMA
By transferring data from the display memory 36 by the controller 46 independently from the CPU 14 for P-ROM writing, it becomes possible to form a display image at high speed and display extremely accurate seams. .

FIG. 3 shows the function of forming a mirror image only of the seams and converting the mode data given to each seam according to the present invention.
Digitizer 1 from ``6'' is the input board
Shows input data from 0, system program
The ROM 22 inverts or converts this input data to create data from "6" to "11" and P-
Write to ROM. The sewing pattern in the figure creates four stitches consisting of diagonal straight lines from "1" to "4".
From here, the stitches are skipped for three stitches, and two stitches from "5" to "6" are created again, and these are reversed as a symmetrical mirror image along the straight line 100 by the mirror image.

As such input data, along with the stitch data described above, mode data for thread trimming at stitch "4" and mode data for starting sewing at stitch "5" must be input at the same time.
In the present invention, these mode data are correctly converted by the program ROM 22. That is, in FIG. 3, mode data "thread trimming" which is different from the input data "sewing start" is stored on the mirror image side for stitch "7", and similarly, mode data for "thread trimming" which is different from the input data "sewing start" is stored on the mirror image side for stitch "7". The mode data "sewing start", which is different from the data "thread cut", is stored, thereby making it possible to correctly convert the mirror image into a sewing pattern.

As described above, according to the present invention, various mode data are converted into data suitable for a mirror image, so it is possible to form a correct mirror image for various modes such as thread trimming, midway stop, and reverse presser foot rotation. This has the advantage that sewing patterns can be created in a short time.

[Brief explanation of the drawing]

FIG. 1 is an external view of a sewing pattern forming device to which the present invention is applied, FIG. 2 is a circuit diagram of the main part of the present invention, and FIG.
The figure is an explanatory diagram of the operation of the present invention, and the same members in each figure are given the same reference numerals, 10 is a tablet digitizer, 14 is a CPU, 24 is a data memory, 26 is a monitor display CRT, 36 is a display memory, 46 is
DMA controller 48 is an isolation gate.

Claims (1)

[Claims] 1 In a sewing pattern generator for a sewing machine that writes a desired sewing pattern supplied from an input board into a pattern memory, there is a data memory that temporarily stores input data including stitch data and mode data from the input board, and a pattern memory. The system includes a CPU that performs write control, and a system program ROM that stores the CPU's write program, and the system program ROM creates stitch data that is reversed around a predetermined axis with respect to stitch data of input data. Has a mirror image creation function,
A sewing pattern forming device for a sewing machine, further comprising a mode conversion function for performing mode conversion required when stitch data is inverted with respect to mode data in the input data.