JPH08112474A - Computer sewing machine - Google Patents

Abstract

PURPOSE: To facilitate thread tension regulation in the case of a computer sewing machine by setting the optimum thread tension at every pattern by means of thread tension regulation information memorized together with pattern information. CONSTITUTION: A central operation unit displays pattern selection information read out from a display data memorizing means 14, and in regard to this selection information, the auto value of the pattern is read out from a thread tension information memorizing means 15, and the stepping motor of a motor-driven thread conditioner 5 is driven, and predetermined pinch-holding pressure is given between thread conditioning dishes. As for the first block of a first pattern, a sewing machine motor 22 is driven by the operation of a start/stop command means 2. In the case of plural patterns being continued and in the case of plural block portions being continued, start is carried out as soon as the motor-driven thread conditioner 5 is set. In synchronization with sewing machine rotation, an X motor 24 and a Y motor 25 are driven on the basis of seam control data read out from a pattern data memorizing means 13 to form a sewing pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer sewing machine provided with a thread tension device for setting an optimum thread tension for a stitch when a sewing machine is used.

[0002]

2. Description of the Related Art There is known a sewing machine which is capable of adjusting the tension by pressing a pair of thread tension discs for holding the thread tension of a needle thread of a sewing machine by using an electric / mechanical control means. . In addition, by adjusting information to correspond to the sewing conditions,
A sewing machine is presented that uses the electrical control means. There is known a sewing machine capable of automatically setting an optimum tension as an "auto value" for a sewing method and a stitch. On the other hand, there is known a sewing machine capable of "manual setting" for setting a desired thread tension instead of "automatic value".

[0003]

[Problems to be Solved by the Invention] With these sewing machines,
Automatically set based on the pattern information, but if there are multiple block parts with different sewing methods in one pattern, if the thread tension is set to the whole as a whole, the stitch finish will be uneven in the pattern. There is an inconvenience. On the other hand, 1
It has been proposed to control the tension for each needle, but the drawback is that the electrical / mechanical control means frequently operates in response to changes in the amplitude and feed in the pattern, resulting in insufficient tracking. there were. Further, with respect to such automatically set thread tension, the operator may change the setting in order to sew with a desired thread tension on the assumption that it changes depending on the type of thread used, cloth, etc. . In this case, it is necessary to repeat trial sewing to adjust how much the adjustment should be made. For this reason, it has been desired to set the adjustment with reference to the adjustment standard.

[0004]

For this reason, the present inventor stores a plurality of thread tension information corresponding to a plurality of stitch formation information as a pair and reads the thread tension information as an automatic value by pattern selection. In a sewing machine that is automatically adjusted, when the sewing pattern is formed on a plurality of sewing blocks, the thread tension is set so that the automatic value is optimum for the sewing conditions for each individual block. The problem was solved by using a characteristic computer sewing machine. The adjustment screen for manual thread tension adjustment with respect to the set automatic value is a computer sewing machine equipped with a thread tension display device for displaying the automatic value which is the optimum thread tension of the current sewing together with the manual adjustment range. This solved the problem.

[0005]

When the pattern is selected, the optimum thread tension is set for each pattern based on the thread tension adjustment information stored together with the pattern information. Further, even when there are block portions with different stitches in the pattern, the thread tension is set by the thread tension adjustment information for each block portion. Also, in the case of manual adjustment instead of the automatic value, the manual adjustment is performed with reference to the automatic value displayed together with the manual adjustment display.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view of a sewing machine according to the present invention. A start / stop key 2 is arranged on a sewing machine frame 1 as start / stop command means for starting / stopping the sewing machine. Reference numeral 3 denotes a display and operation device, which allows a desired selection according to a display displaying various selection information by operating a transparent touch panel arranged on the liquid crystal display. Regarding this operating device, Japanese Patent Application No. Sho 63-181,485 previously disclosed by the applicant of the present application has been disclosed.
Since it is the same as, the detailed description will be omitted.

The sewing machine has a built-in electric thread tensioner 5 for applying thread tension to the upper thread from the bobbin 4. The details will be described in detail with reference to FIG. 7.

In FIG. 7, 6 and 7 are a pair of thread tension discs for sandwiching the upper thread between them, and a thread tension shaft 8 is erected in the thread tension disc 6. A spring pressing member 9 is attached to the thread tension shaft.
Is fitted so as to be movable in the axial direction, and a thread tension spring 10 is arranged between the spring pressing member and the thread tension disc 7.

Reference numeral 11 denotes a thread adjusting cam, which has a cam groove 11a having an eccentric portion with respect to the center of rotation. A pin 9a in which a spring pressing member is planted is fitted in the cam groove. Therefore, the rotation of the thread adjusting cam 11 causes the cam groove 11a to rotate.
Eccentricity causes the spring pressing member 9 integrated with the pin 9a to move on the thread tension shaft to act on the thread tension spring 10 to generate thread tension pressure on the upper thread sandwiched between the pair of thread tension discs. ing.

The thread adjusting cam 11 is fixed to the output shaft of a stepping motor (not shown) fixed to the sewing machine frame 1.

Next, the control block of the present invention will be described with reference to FIG.
Will be described with reference to. Designated by 12 is a pattern selection means, which selects a desired pattern from a plurality of patterns displayed on the display unit of the display and operation device 5 by operating a touch panel on the pattern. A pattern data storage unit 13 stores control data for pattern formation.

A display data storage means 14 stores display data of the display and operating device. Reference numeral 15 is a thread tension information storage means, which stores the optimum thread tension values corresponding to the stored plural patterns as respective auto values. Further, when a plurality of different sewing blocks are present in the pattern, the thread tension adjustment information corresponding to each of them is also stored as the block corresponding automatic value.

Reference numeral 16 is a thread tensioner drive circuit, which drives and controls a stepping motor of the electric thread tensioner 5. 1
Reference numeral 7 is a display unit, which is a display unit of the display and operation unit 3.

Reference numeral 18 denotes an automatic / manual switching means, which is an "automatic state" in which the adjustment state of the electric thread tension regulator is automatically adjusted in accordance with the thread tension information storage means 15, and the operator arbitrarily sets it to a desired value. "Manual state" to adjust
Switch to and.

Reference numeral 19 is a manual adjusting means for setting a desired value for the "manual state" by the switching means 18. Reference numeral 20 denotes a manual adjustment value storage means, which stores a manual value set to a desired value.

A motor drive circuit 21 controls the sewing machine motor 22 to a speed set by the start / stop command means and the speed command means 26. 23 is a stepping motor drive circuit, which synchronizes with the rotation of the sewing machine,
Based on the stitch control data read from the pattern data storage means 13, the X motor 24 and the Y motor 25 are driven to form a sewing pattern.

Next, the thread tension adjustment at the time of forming a pattern using the thread tension adjustment information will be described with reference to FIG. Starting from power-on, in step 1 (S1, hereinafter the same order), the display means of the display / operation device 5 displays the pattern selection information read from the display data storage means 14.
A desired pattern is selected by operating the touch panel on the display. The pattern in this case will be described by taking a pattern composed of a plurality of sewing blocks for which different thread adjustments are preferable.

In S2, the "auto value" of the pattern is read from the thread tension information storage means 15 in response to the selection, and S3
Drive the stepping motor of the electric thread tension regulator 5 to apply a predetermined clamping pressure between the thread tension discs.

S for the first block of the first pattern
By operating the start / stop command means 2 of 4, the sewing machine motor 22 is driven. When a plurality of patterns are continuous or a plurality of block portions are continuous, the electric thread tension regulator 5 is started as soon as it is a knot. In synchronization with the rotation of the sewing machine, the X motor 24 and the Y motor 25 are driven based on the stitch control data read from the pattern data storage means 13 to form a sewing pattern. When the stitch formation of the first block portion of the plurality of blocks is completed in S5, the process is stopped in S6.

In S7, it is judged whether or not another block portion exists in the same pattern. If it exists, the "auto value" of the block portion is read in S2, and similarly in S3, the electric thread tension adjuster 5 Set. In S4, S5 and S6, the seam of the next block portion is formed. While another pattern block portion is present in the same pattern in S7, the thread tension regulator 5 is similarly controlled to form a stitch.

When it is determined in S7 that all the block parts are completed, it is determined in S8 whether there is a next continuous pattern. If there is a continuous pattern, the "auto value" of the next pattern is read in S2. Form seams. When it is determined in S8 that the continuous pattern is finished, it is determined in S9 whether or not the sewing is finished. If it is not finished, a new pattern is selected in S2 and the thread tension regulator 5 is similarly set to form a stitch. To do.

Next, in place of the "auto value" for the pattern,
"Manual" adjustment, which adjusts the thread tensioner to a desired value, is described with reference to FIG. In S1, the display means of the display / operation device 5 displays the pattern selection information read from the display data storage means 14. A desired pattern is selected by operating the touch panel on the display.

In S2, in response to the selection, the "automatic value" of the pattern is read from the thread tension information storage means 15, and S3
Then, the stepping motor of the electric thread tension device 5 is driven to set a predetermined clamping pressure between the thread tension discs.

In S4, the state is displayed as "auto" 27 as shown in FIG. Figure 5
A "manual" 28 for switching to "manual" is displayed therein. When the touch panel on the "manual" 28 is operated and selected in S5, it is determined in S6 whether or not a manual value is stored in the manual adjustment value storage means 20.

When it is determined that the manual value is not stored, the display changes in S7 as shown in FIG. 6, and the manual adjustment screen is displayed. Numerical display 31
Then, a display 32 instructing strong setting and a display 33 instructing weak setting are displayed. At the same time, the display 34 showing the position of the "automatic value" is displayed. Reference numeral 35 is a display indicating a manual adjustment state, 36 is a display for instructing return to the automatic state, and RET 37 is a display for instructing return on the screen of FIG.

When the RET 37 is operated, FIG. 5 is displayed again, but when the manual adjustment value is changed to the "automatic value" and the instruction is given, the manual display is highlighted to show the selected state.

When it is determined in S6 that the manual value is stored, the stored manual adjustment value is displayed at the position of the display 30.

In S9, when the touch panel on the display 32 for instructing the strengthening setting or the display 33 for instructing the weakening setting is operated to perform the manual adjustment, the display 30 is displayed.
The position is changed and the value is displayed on the numerical display 31.

The adjusted value is stored in the manual value storage means 20, and the electric thread tension regulator is operated and set in S10. In this embodiment, the manually adjusted value is stored and held to be valid even when the next pattern is selected. However, the value is initialized by a new pattern or pattern selection so that the value can be freely selected. Is also good.

[0030]

The present invention has the above-described structure and operation, and when a thread tension adjuster is automatically set based on pattern information, a plurality of block sections with different sewing methods are included in one pattern. If the thread tension adjustment information is present, the thread tension adjustment information can be adjusted based on the individual thread tension adjustment information. In addition, in order to sew with a desired thread tension, assuming that the thread tension that is automatically set changes depending on the type of thread used, cloth, etc., when changing the setting, As an indication of how much to adjust, the automatic value, which is the optimum value under the standard sewing conditions of the pattern, is displayed at the same time, so that manual adjustment can be set while referring to it.

[0031]

[Brief description of drawings]

FIG. 1 is an external view of a sewing machine of the present invention.

FIG. 2 is a control block diagram of the present invention.

FIG. 3 is an explanatory view of control of block sewing according to the present invention.

FIG. 4 is an explanatory diagram of a manual adjustment control according to the present invention.

FIG. 5 is an explanatory diagram of a thread tension setting screen of the present invention.

FIG. 6 is an explanatory diagram of a manual adjustment screen of the present invention.

FIG. 7 is an explanatory view of an electric thread tension device of the present invention.

[Explanation of symbols]

 3. Display and operation device 5. Electric thread tensioner 12. Pattern selection means 15. Thread tension information storage means 18. Auto / manual switching means 19. Manual adjustment means 20. Manual adjustment value storage means

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] January 30, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

FIG.

[Figure 7]

[Fig. 2]

[Figure 3]

[Figure 5]

[Figure 4]

[Figure 6]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mikio Koike 3-1-1, Kyobashi, Chuo-ku, Tokyo Jamno Sewing Machinery Co., Ltd. (72) Inventor Shinichi Fuchigami 3-1-1, Kyobashi, Chuo-ku, Tokyo Within Sewing Industry Co., Ltd.

Claims (2)

[Claims] 1. A sewing machine in which a plurality of thread tension information corresponding to a plurality of stitch formation information are stored as a pair, and the thread tension information is read out as an automatic value by pattern selection and is automatically adjusted. When a plurality of sewing blocks are formed in the sewing machine, the thread tension is set so that the automatic value is optimum for the sewing condition of each individual block. 2. A sewing machine in which a plurality of thread tension information corresponding to a plurality of stitch formation information are stored as a pair, and the thread tension information is read out as an automatic value by pattern selection to automatically adjust the value. On the other hand, in the case of manual thread tension adjustment, a computer sewing machine equipped with a thread tension display device that displays the automatic value which is the optimum thread tension of the current sewing as well as the manual adjustment range.