JPH0644951B2 - Computer sewing machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to stitch position adjustment control in a sewing machine.

(Prior Art and Problems Thereof) A conventional computer sewing machine makes it possible to adjust a needle amplitude value in zigzag sewing by a manual operation. For example, the center of the maximum needle amplitude is used as a base line and each fixed base line is adjusted. Since the needle amplitude is set by adjusting the length up to the stitch, it was not possible to translate the entire zigzag stitch width in the needle amplitude direction.

(Solution) According to the present invention, the coordinates of the stitch base line for setting each stitch position by the needle amplitude of the zigzag stitch are calculated and set based on the designation operation by the first manual operation means, and the second stitch operation is performed. The needle amplitude value is calculated and set based on the specified operation by the manual operation means, and the distance in the amplitude direction from one end of the maximum zigzag width to each stitch position by the needle amplitude is calculated and set and the mode switching operation member is also set. At the time of the operation, each specified value of the stitch base line or the needle amplitude value in the state before the operation is registered, and each needle drop point is calculated and set by the registered specified value and the manual specified value by the operation. The entire stitch of zigzag stitch during sewing can be moved in parallel in the amplitude direction.

(Examples) Examples of the present invention will be described below with reference to the drawings. FIGS. 2a to 2f are for explaining the stitch coordinate relationship by the stitch adjustment control of the zigzag stitch, and in this embodiment,
The left end of the zigzag maximum width Z is coordinate 0, and the right end is 30, and the space between them is divided into 30 and needle drop control is performed.
The stitch amplitude data for stitch control relating to zigzag stitching is stored alternately as 0, 30 as coordinate data for 1st stitch to 6th stitch. When these are used without being reduced and adjusted, As shown, zigzag stitches are formed with a maximum width Z. Note that certain data is used for cloth feeding. The vertical axis in each of FIGS. 2b to 2f represents the reduction rate. In each figure, when the reduction rate K is adjusted from 0 to 1 by the second manual operating means described later,
Referring to FIG. 2e, according to the reduction ratio K, the distance W between the hypotenuses of a triangle with a zigzag width (needle amplitude value) W (vertical line when the stitch base line matches the left base line or the right base line) (Including edges) is set. Then, in accordance with the adjustment of the stitch base line S by the first manual operating means, for example, the seam base line S is sequentially adjusted to 0, 10, 15, 2030, as shown in FIGS. 2b to 2f. This corresponds to the coordinates of the vertices of each triangle sequentially shifting to 0, 10, 15, 20, 30. The relationship of these adjustment controls is based on the following arithmetic expressions. With reference to FIG. 2e, the coordinate in the amplitude direction starting from the left end of the maximum zigzag width Z of the left needle drop point Pa and the right needle drop point Pb of the zigzag stitch is the distance to the left end of the maximum zigzag width Z. Is represented by A and the distance to the right end is represented by B, which is represented by the following equation.

Pa = S−W × A / Z, Pb = S + W × B / Z In these equations, since the distances A and B are functions of the maximum zigzag width Z and the stitch base line S, the needle drop points Pa and Pb are , A constant maximum zigzag width Z and a function of the stitch base line S and the zigzag width W. Since the zigzag width W linearly changes according to W = ZK according to the reduction rate K, as shown in FIGS. 2b to 2f, etc., in the second manual operation, the operation amount is executed. In the example, the reduction rate K (1 to 0) is calibrated as shown in FIG. 3, but either the reduction rate K or the zigzag width W may be calibrated.

FIG. 3 is a schematic view of the manual operating device, in which the mode switching operation button (J) is provided with respect to the operation dial (T) so that the first manual operating function and the second manual operating function are mutually operated. The switching is performed. When the operation dial (T) has the first manual operation function and the arrow (P) is "left" of the index (M), the stitch base line S has the left end of the zigzag maximum width Z as shown in Fig. 2b. When it is in the "center", the stitch base line S becomes the center as shown in FIG. 2d, and when it is in the "right" it becomes the right end as shown in FIG. 2f. In the second manual operation function, when the arrow (P) is 0, the reduction ratio K = 0, that is, the operation is designated at the apex position of the triangle in FIGS. 2b to 2f and the amplitude W is 0. If the arrow (P) is 1, the reduction ratio K = 1, that is, the amplitude W becomes maximum similarly. When the indicator lamp (L ₁ ) is off (OFF), the amplitude W
Shows the mode in which the manual adjustment by the operation dial (T) is disabled, the intermittent blinking indicates the mode in which the manual adjustment of the amplitude W is enabled, and the lighting (ON) indicates The mode in which the manual adjustment value of the amplitude W is fixed to a certain value is shown. Similarly, when the indicator lamp (L ₂ ) is off, it indicates the mode in which the stitch base line S is automatically set and the manual adjustment by the operation dial (T) is disabled. The mode in which this adjustment is enabled is indicated, and the lighting indicates the mode in which this adjustment value is fixed at a certain value. Table 1 shows the mode switching operation buttons
It shows these states in each mode according to the number of operations of (J).

In the table, the number of times the mode switching operation button (J) is operated is 0
(This is called mode O, and the same applies to mode 1,
Call it a few. ) Is an automatic setting, and as shown in FIG. 2d, the stitch base line S is fixed to the center of the zigzag maximum width Z, and the amplitude is standardly fixed to a predetermined value that the reduction ratio K is slightly smaller than 1. I have to. In mode 1, the stitch base line S automatically set in mode 0 is fixed and the amplitude W can be adjusted manually, and in mode 2, the final value of the manual adjustment of the amplitude W in mode 1 is fixed and the stitch is fixed. The baseline S is manually adjustable, and mode 3 allows the final value of the manual adjustment of the stitch baseline S in mode 2 to be fixed and the amplitude W to be manually adjustable.

FIG. 4 is a control circuit diagram, which shows a central processing unit (CPU),
Fixed storage device (ROM), temporary storage device (RAM), I / O port
(I / O) constitutes a microcomputer. The fixed storage device (ROM) also stores a stitch control signal for a normal stitch pattern. The key matrix (K) is composed of a pattern selection key (K ₁ ), a mode switching key (K ₂ ) by a mode switching operation button (J), etc. When these are operated, the microcomputer reads them. In addition, (B ₁ ) and (B ₂ ) are buffers, (RA) is a pull-up resistor, and (Vcc) is a positive potential power source for control. The variable resistor (Rx) is for moving the mover (Mx) according to the movement of the operation dial (T) and outputting the voltage of the level corresponding to the movement position. It is used as adjustment data for the eye base line S or the amplitude W. The variable resistance (Ry) outputs a voltage at the moving position level of the mover (My), and the voltage level is used as cloth feed adjustment data. Comparator (Cx) (Cy)
Is connected to each non-inverting input terminal (+) of each smoothing circuit (D ₁ ) (D ₂ ).
The voltage level signal of each mover (Mx) (My) is received via. The digital-analog converter (D / A) constitutes a ladder circuit and is a program for comparison confirmation (not shown).
The 7-bit digital data逐時processed, line _{(E 6) ~ (E 0} ), when receiving through Puruatsupu resistor (RB), the digital data sequentially 64,32,16,8,4,2, The weight is converted to 1 to obtain the added value 0 to 127, and these data are given to the inverting input terminals (-) of the comparators (Cx) (Cy). Each comparator (Cx) (Cy) compares the input signal of each input terminal (+) (-),
Outputs (H) level or low (L) level signal. Line (E ₇ ) or (E ₈ ) enables the output of the comparator (Cx) or (Cy) when the line is at the H level, and invalidates it when the line is at the L level. Processor (C
One of them is set to the H level and the other is set to the L level by the PU), and the output signal of the comparator (Cx) or (Cy) corresponding to the H level is received through the line (E ₉ ). The buffers (B ₃ ) and (B ₄ ) invert and transfer the output signal of the comparator (Cx) or (Cy). (LED) is the indicator light in Fig. 3.
Each display including (L ₁ ) and (L ₂ ), (SM) is a sewing machine motor, (SP) is its control unit, (CNT) is a controller for speed control of the sewing machine motor (SM), and (BM) is a needle. A pulse motor for amplitude control, (F
M) is a pulse motor for cloth feed control, and (DV) is a drive device for these.

The operation of the above configuration will be described with reference to the control flowcharts of FIGS. 1a and 1b. This program is started when zigzag sewing is selected by the pattern selection key (K ₁ ). Hereinafter, although each mode switching flag is omitted, mode 0 is set. When the mode switching operation button (J) is not operated, the fixed reduction ratio K ₀ for automatic setting is read as the reduction ratio K. Needle amplitude value (zigzag width) W = ZK ₀
Is calculated and fixed, and the stitch base line S is set to the center base line. Then, when the controller (CNT) is turned on, sewing is output. According to FIG. 1b, upon sewing output, respective distances A and B from the stitch base line S to the left end and the right end of the zigzag maximum width Z are calculated by the equations A = S and B = Z−S. Then, as the first needle drop point, the needle drop point P ₁ on the left side of the amplitude W is calculated by the equation P ₁ = S−W × A / Z, and the sewing is executed by the needle drop point, and the second needle drop point is executed. As a point, the needle drop point P ₂ on the right side of the amplitude W is calculated by the formula P ₂ = S + W × B / Z, and the sewing is sequentially executed by the needle drop point.
And repeated. If a pattern other than zigzag sewing is selected during this time, the process returns to the main program.

When the mode switch operation button (J) is operated once, the mode 1 is entered, the indicator lamp (L ₁ ) blinks, and the operation dial
It is known that the needle amplitude value (reduction ratio K in this embodiment) can be manually adjusted by (T). Then, the reduction rate K relating to the needle amplitude value by manual adjustment is read. The manual needle amplitude value W is calculated by the formula W = Z × K, and the stitch base line S is set to the center base line. When the controller (CNT) is turned on, A =
S and B = Z−S are calculated, and the first needle drop point P ₁ = S−W ×
A / Z is calculated and sewing is performed at the needle drop point.
The program is repeated. Then, in this embodiment, for the next needle drop point P ₂ , the same manual amplitude value W as at the needle drop point P ₁ is used, and P ₂ = S + W × B / Z is calculated to obtain the needle drop point. Sewing is performed and these are repeated.

When the mode switching operation button (J) is operated again, the mode is changed to the mode 2, the display lamp (L ₁ ) is turned on to indicate that the amplitude W has been manually set, and the final manual amplitude set in the mode 1 is set. The value W is registered. Further, the display lamp (L ₂ ) blinks to inform that the manual adjustment of the stitch base line S can be performed by the operation dial (T). Then, the stitch base line S by manual adjustment is read and determined. When the controller (CNT) is turned on, needle drop points P ₁ and P ₂ are calculated in the same manner as above, and sewing is performed at each needle drop point.

When the mode switching operation button (J) is operated again, the mode 3 is entered, the display lamp (L ₂ ) is turned on, and the value of the final manual stitch base line S in the mode 2 is registered. Further, the display lamp (L ₁ ) blinks, the reduction rate K by manual adjustment is read, the amplitude value W is calculated in the same manner as above, and when the controller (CNT) is turned on, the needle entry points P ₁ , P Sewing according to ₂ is executed.

When the mode switching operation button (J) is operated again, the respective display lamps (L ₁ ) (L ₂ ) are turned off and the mode 0 is set.

FIG. 5 shows the stitch base line S as the zigzag sewing progresses.
Fig. 7 shows an example of a pattern obtained by manually designating the stitches. In Mode 1 of Table 1, the needle amplitude W is designated to a desired value, the mode is switched to Mode 2, and the stitches progress as the sewing progresses. By appropriately manipulating the base line S, a pattern with a constant amplitude W as shown in the figure can be obtained.

FIG. 6 shows another embodiment of the manual operating device and corresponds to Table 2.

Explaining the difference from FIG. 3, the return operation button
(J ') is for returning to the automatic setting mode, and the amplitude manual mode designating operation button (H) registers the stitch base line S which is the final value before the operation by the operation, and the needle amplitude. W can be manually adjusted, and the stitch base line manual mode designating operation button (I) allows the stitch amplitude, which is the final value before the operation, to be registered and the seam base line S to be manually adjustable. Indicator lamp (L ′ ₁ ) (L ′
₂ ) displays each state in the same way as the display lamps (L ₁ ) (L ₂ ).

FIG. 7 is a flow chart of control combined with the operation with the manual operating device of FIG. 6, and the sewing output control is according to FIG. 1b. In FIG. 7, when each operation button (H) (I) (J ') is operated, it is received in a timely manner, and a flag indicating that they have been operated is set, and these flags are set in the discrimination process "amplitude code". (H) "" Baseline code (I) "" Return code
(J ′) ”, and control is performed according to FIGS. 1a and 1b.

(Effect) As described above, according to the present invention, the amplitude of zigzag sewing and the stitch base line can be freely manually adjusted by a simple operation.
In the manual adjustment, the common operating part can be adjusted, the zigzag sewing amplitude and the entire stitch can be moved in parallel in the amplitude direction during sewing, and a decorative zigzag pattern can be sewn. The application range of sewing for sewing machines can be greatly expanded.

[Brief description of drawings]

1a, 1b is a control flow chart showing an embodiment of the present invention,
2a to 2f are explanatory views of the seam coordinate relation of the seam adjustment control, FIGS. 3 and 6 are schematic diagrams showing respective embodiments of the manual operating device, FIG. 4 is a control circuit diagram, and FIG. Is a pattern formation example, and FIG. 7 is a flow chart of control showing another embodiment. In the figure, the operation dial (T) is the manual operation member, the mode switching operation button (J), the return operation button (J '), the amplitude manual mode designation operation button (H), and the stitch baseline manual mode designation operation button (I). The mode switching operation member and the central processing unit (CPU) are the main elements of each processing means.

Claims (1)

[Claims] 1. A sewing machine which stores digital stitch control information and is capable of forming stitch patterns by changing stitch coordinates of needle amplitude and cloth feed under computer control. When a zigzag sewing is selected, the first manual operation for setting the coordinate value and the second manual operation for setting the needle amplitude value have mode switching operation members that can be switched to each other. The coordinate value of the stitch base line can be specified and operated by the manual operation means over the entire maximum zigzag width, and the needle amplitude value can be specified and operated by the second manual operation means. The distance to the left and right needle drop points in the amplitude direction starting from one end of the zigzag width is calculated and set from the constant maximum zigzag width, the coordinate value of the stitch base line and the needle amplitude value. At the time of work, each specified value of the stitch base line or the needle amplitude value before the operation is registered, and each needle drop point is calculated and set by the registered specified value and the manual specified value by the operation. A characteristic computer sewing machine.