JPH0268350A - Automatic embroidering machine - Google Patents

Abstract

PURPOSE:To carry out direct linear return of a embroidering frame to a position n needles before in stopping due to yarn breakage by memorizing absolute coordinate values at the initial position of the above-mentioned frame, preparing stitch data from compressed data of a pattern and memorizing the absolute coordinate values from the present time to a position n needles before based on the afore-mentioned data. CONSTITUTION:A means for memorizing absolute coordinate values at the initial position of an embroidering frame set in starting, a means for preparing stitch data based on relative coordinates from compressed data of the previously memorized pattern and an X-Y axis driving means for moving and controlling the embroidering frame based on the above-mentioned stitch data are provided. Furthermore, a means for successively adding the stitch data, memorizing the absolute coordinate values of the present time to the needle location to a position n needles before and a means for preparing an embroidering frame return data by calculating the travel of the above-mentioned embroidering frame to the needle location n needles before based on the above-mentioned absolute coordinate values are installed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an automatic embroidery machine that performs embroidery based on pattern data stored in advance in a storage device, and particularly relates to processing when thread breaks.

(Prior art and problems to be solved by the invention) Conventionally,
Detection and recognition of thread breakage is performed at several stitches (for example, 3 stitches), and after stopping the sewing machine, the position data for several stitches larger than the number of stitches (for example, 5 stitches) are sequentially read out in the opposite direction to the sewing time, and the embroidery hoop is set. There is a method of sequentially stepping back while moving the chisel in a zigzag manner.

In the case of this conventional method, in order to perform stitch stitching, it is necessary to sequentially read the stitch data indicated by relative coordinate values and perform inverse conversion calculations on each of the X data and Y data each time. If the embroidery hoop moves back a few stitches when the thread breaks, it is necessary to swing the embroidery hoop from side to side while keeping the timing within the range where the stencil motor on the X-Y axis does not go out of step. This causes the problem that stitch hacking takes time. there were.

(Means for Solving the Problems and Effects of the Invention) The present invention provides an automatic embroidery machine that performs embroidery based on pattern data stored in a storage device in advance. Stitch data based on relative coordinates read out for forming embroidery stitches is added sequentially,
Absolute coordinate value securing means that stores the absolute coordinate values of the needle drop position from the current position to the nth needle position, and after the thread breaks, the main shaft of the sewing machine is stopped and the needle nth previous needle of the embroidery hoop is set based on the absolute coordinate value of the previous n stitches. The present invention provides an automatic embroidery machine that is equipped with a embroidery machine that calculates the amount of movement to the dropped position, and a means for creating frame return data. This eliminates unnecessary stitch hacks that involve completely reversing the previous stitching process, and instead backs the needle in a straight line to a predetermined needle position a few doors ago.The time required for this is shortened and sewing efficiency is improved.
This indicates the relative movement amount from the point of thread breakage to the next needle position.
One set of two-axis movement amounts for the axial circumference and the Y-axis forms one stitch.

The control means 20 includes a CPU, ROM, and RAM, and forms a so-called micro combi coater. Reference numeral 10 indicates a start operation means which is manually operated; 11 indicates a pattern selection means which selects a pattern by inputting a code or directly selecting a character; and 12 indicates whether the needle moving downward is at the top or the bottom. 13 is a thread breakage detection means, and I4 is an initial position setting means for automatically bringing the embroidery frame to its initial position, for example, to the center of the embroidery frame when the power is turned on.

Reference numeral 15 denotes a pattern storage means which stores the pattern in the form of compressed data on, for example, a floppy disk. Reference numeral 24 denotes an embroidery frame initial position storage means for storing the absolute value of the coordinates of the embroidery frame after the embroidery frame is set to the initial position after the power is turned on. 25 has the effect of reducing the number of programs required for each needle drop using relative coordinates for forming an embroidery pattern by converting the compressed data from the pattern storage means 15, thereby reducing the amount of program memory required.

(Example) - General structure of automatic embroidery machine The general structure of the automatic embroidery machine of the present invention will be explained below with reference mainly to the block diagram of FIG. 2.

The automatic embroidery machine of the present invention sets a work cloth in an embroidery frame, and moves the embroidery frame to the X-Y drive means 18 based on embroidery data while timing the needle moving up and down.
This is to control the embroidery pattern while controlling X-Y. Regarding the embroidery data, the pattern selection means II selects a desired embroidery pattern from a plurality of embroidery data stored in the form of compressed data in the pattern storage means 15 such as a floppy disk, and stores the selected embroidery pattern in the working RAM.
From this compressed data, each needle drop point data (stitch data) for actually forming an embroidery pattern is expanded and created by the stitch data creation means 25. This developed data is determined by the current needle position or the stitch data creation means for creating position stitch data, and the absolute coordinate value securing means 22 calculates the relative coordinates of the stitch data creation means 25 based on the initial position stored in the embroidery frame initial position storage means 24. The embroidery hoop return data creation means 23, which is a means for calculating needle absolute coordinate values for each stitch movement based on stitch data and, based on the result, always securing the absolute coordinate values up to, for example, five stitches before, detects thread breakage and After stopping the main shaft, use the absolute coordinate value of the current position of the needle after the stop and the absolute coordinate value of, for example, 5 stitches before, which is secured in the absolute coordinate value securing means 22.
This is a means for creating embroidery hoop movement amount data for returning the embroidery hoop linearly to the previous needle position.

- Absolute coordinates of needle drop points How to determine the absolute coordinates of each needle drop point will be explained with reference to FIG. In the figure, if the embroidery area is a rectangle, the lower left corner is expressed as X-o and y=o, with the origin of the absolute coordinates.

Assuming that the maximum of the X axis is 120 ++ and the maximum of the SY axis is 100 mm, the absolute coordinates of the center point 0 can be expressed as (60, 50). From this center point, as shown in the figure, S, , S2 . (xn, yn) (n= I, 2
, 3...), the absolute coordinates of the X and Y axes of Sn are X n,
Y n (n-12, 3) are respectively as follows.

Control related to thread breakage Next, the control related to thread breakage will be explained mainly with reference to the flowchart shown in FIG.

In the following explanation, 5PN (N=1.2.3.) indicates each step of control.

SPI index register after start (IX)
Stores the start address of the memory where the stitch data is stored.

SP2 Absolute coordinate values (XY) of the initial position of the embroidery hoop
is used as the embroidery frame initial position storage means 24.

S P 8 Add the amount moved in S P 7 to the absolute coordinate value to obtain the current value of the absolute coordinate.

SP9 Stores the current value of the absolute coordinates obtained as a result of calculation in SP8 in the shift buffer. This soft buffer is shown in FIG. 3, and the details will be described later.

SP I 09 SP I 1 Next, check at 5 PIO whether the needle is in the lower position, and if not, if the thread breakage sensor (not shown) is activated three times in a row, it is determined that the thread has broken and that is checked. If the thread is not broken, the needle down position is checked at 5 PIO, and if the needle is in the needle down position, the process returns to SP3 and the embroidery pattern is formed.

5PI2 If the needle thread breaks during the stitch formation process, the main shaft of the sewing machine will stop.

5P13. SPI4 and 5PI3 calculate and create the movement amount data of the embroidery frame from the current coordinates and n-adary previous coordinates, and
At step 14, the embroidery hoop returns directly and linearly to the course position n stitches ago.

Set in buffer. In the example shown in Figure 5, the absolute coordinates of the center point 0 as the initial position of the embroidery area are (X, Y
) - (60, 50).

SP3 Read the stitch data at the address indicated by the index register from the stitch data memory created by the stitch data creation means.

This data is X data. Then, in preparation for reading the next X data, the contents of the index register (IX) are incremented by one, thereby advancing the address by one.

SP4 Reads the X data from the stitch data memory and sets the contents of IX to 1 in preparation for reading the next X data.
increase by one.

SP5 Drives the main shaft of the sewing machine to move the needle up and down.

SP6 Check whether the needle is in the upper position.

If the needle is in the upper position in SP7 8P6, the X-axis and Y-axis step motors are driven based on the (X, Y) stitch data indicated by the relative coordinate values read earlier (XY-axis drive means).
8 controls the movement of the embroidery frame. In this case, the contents of the index register (I

5P15 After manually setting the upper thread, when the sewing machine is restarted by operating the start operation means 10, S
Return to P3 and continue embroidering again, correcting the thread breakage and sewing further.

・Absolute coordinate value securing means Here, to explain the soft buffer for storing absolute coordinates using Fig. 3, each time SP9 is reached, the current value is entered in 101 and at the same time, the previous current value is 1 stitch of 102. Shift to the buffer containing the previous part.

At the same time, the previous one stitch previous data is shifted to the two stitch previous buffer 103. Similarly, the data from 3rd and 4th stitches ago are shifted to the buffers from 4th and 5th stitches ago, respectively, and the data from 5th stitch ago is S
It will be discarded by H5 software, or rewritten by software from 4 stitches earlier. Therefore, when the sewing machine stops due to thread breakage, it is possible to read the absolute coordinate value 106 five stitches ahead and directly move the embroidery frame back to this coordinate value based on it.

As a result, as in the conventional method shown in Fig. 7, if the sewing progresses from S2 to S3 and S5, and the thread breaks at the X mark between S5 and 86, and stops at S8, it will take 5 stitches. To return to the previous 83, from 88 points B1-B2 → B3 →
B4. - In the case of the present invention, as shown in Fig. 6, without stitching back sequentially by B5 and 5 stitches, from needle position S8 at the time of thread breakage stop, go directly to B1 and 5 stitches earlier to needle position S3. It is possible to return linearly to That is, the present invention always secures the absolute coordinate value of 5 stitches 01j, so when returning to the absolute coordinate of 5 stitches earlier, it is sufficient to use the data at the fixed address 106 without reading the data backwards. Moreover, when changing the specification to 4 stitches earlier or 3 stitches earlier, it is only necessary to change the fixed read address to 105 or 104.

FIG. 4 shows another embodiment of the buffer for storing absolute coordinate values.
The current value is stored sequentially from TI→...Sr1.
When it reaches 1, store again from STI. After one round, it is possible to immediately return to the 5th needle position directly and linearly without having to read the 7th needle or take timing to insert the next needle.

[Brief explanation of the drawing]

1 to 6 relate to an embodiment of the present invention, in which FIG. 1 is a flowchart 1 of control related to thread breakage, FIG. 2 is a block diagram schematically showing an automatic embroidery machine, and FIG. Figure 4 is a diagram graphically showing a shift buffer for storing absolute coordinates, Figure 4 is a diagram graphically showing a link type buffer for storing absolute coordinates, and Figure 5 is a diagram showing stitching using absolute coordinates and relative coordinates within the embroidery area. FIG. 6, which is a diagram for explaining the relationship with points, is a diagram showing the stitch bank after thread breakage. FIG. 7 is a diagram showing stitchback after thread breakage according to a conventional example. 17 is a stitch forming means, 18 is an x-y axis driving means, 22 is an absolute coordinate value securing means, 23 is an embroidery frame return data creation means, 24 is a stitching/frame initial position storage means, and 25 is a stitch data creation means It is. It will contain the previous data. Therefore, for example, if you want to go back 7 stitches when the thread breaks, you just need to read out the absolute coordinate values of the next stored A/R. In the case of FIG. 3, the address where the current value is stored is always fixed at 101, whereas in the case of FIG. 4, the address where the current value is stored is always changed in a ring shape. In the case of FIG. 3, it is necessary to shift all the data from the current value to five stitches before each time, whereas in the case of the method of FIG. 4, there is an advantage that only the storage address needs to be reset and incremented. (Effects) As described above, according to the present invention, the absolute coordinate values up to, for example, the 5th stitch are always secured during operation, so when the thread is cut, the 5th stitch
When returning to the coordinates in front of the needle, there is no need to return to the coordinates in front of the needle without returning five stitches ago, unlike in the conventional method in which sewing data is used as is. Zunai Tsuchi, in order to return to these 5 needles, the data reverse patent applicant Janome Sewing Machine Industry Co., Ltd.

Claims (1)

[Claims] A stitch forming means having a needle that moves up and down and a needle thread catching means that cooperates with the needle, and an embroidery frame that holds the work cloth are X-Y controlled in synchronization with the up and down movement of the needle based on pattern data. In an automatic embroidery machine that forms an embroidery pattern on a processed cloth, an embroidery frame initial position storage means for storing absolute coordinates of an initial position of an embroidery frame set at an initial position of an X-Y axis drive range when the power is turned on; Stitch data creation means for creating stitch data based on relative coordinates from the compressed data in the pattern storage means selected by the selection means, and movement control of the embroidery frame based on the stitch data read out in synchronization with the vertical movement of the needle. An X-Y axis drive means and an absolute coordinate value that stores the absolute coordinate value of the needle drop position from the current position to n stitches ago obtained by sequentially adding the read stitch data to the absolute coordinate of the initial position. and embroidery hoop return data creation means for calculating the amount of movement of the embroidery hoop to the needle drop position n stitches ago based on the absolute coordinate value n needles ago after the main shaft of the sewing machine stops when the thread breaks. An automatic embroidery machine characterized by: