JP3146458B2 - Electronically controlled pattern sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronically controlled pattern stitch sewing machine, and more particularly, to a method in which a feed dog is reciprocated in a cloth feed direction by a stepping motor, and this motor is driven based on feed data among stitch data. The present invention relates to an apparatus configured to correct an error in a feed amount during drive control.

[0002]

2. Description of the Related Art In a recent electronically controlled pattern stitch sewing machine, a stepping motor for reciprocatingly driving a feed dog for feeding a work cloth is provided, and a pattern selected from a stitch data memory storing a large number of pattern stitch data is provided. The stitch data is read out, and the needle swing stepping motor is controlled based on the needle swing data of the stitch data, and the feed stepping motor is controlled based on the feed data of the stitch data to form the pattern. However, due to the mechanical error of the feed mechanism and the asymmetry of the presser foot that holds the work cloth, a slight feed error occurs in the feed amount, and this error is Because it is different from backward movement, 1
In the case of a large pattern that requires 100 stitches or more for one pattern, there is a problem that a feed error is accumulated and a stitch pattern is disturbed, resulting in a poor appearance.

Further, depending on the stitch pattern, there are many cases where the pattern start point and the pattern end point are completed at the same point.
If the pattern start point and the pattern end point do not match due to a feed error, there is also a problem that disturbance of the stitch pattern becomes obvious at a glance. Therefore, the applicant of the present application filed the prior application (Japanese Patent Application No.
No. 85895), a correction key (plus key and minus key) for setting a correction amount obtained by trial sewing or the like.
And a feed amount correction technique for intermittently correcting the feed data (for example, every 30 stitches or 50 stitches) with a correction amount set by the correction key has been proposed.

[0004]

However, in the above-described feed amount correction technique, the feed amount of each stitch is not corrected by a minute amount, but, for example, the feed amount is intermittently increased or decreased every 30 stitches or 50 stitches. Therefore, for example, in the case of a satin stitch forming a portion of a pattern (usually, each pattern is formed of a combination of a satin stitch, a triple stitch, and a single stitch), a large number of hand movements with a small feed amount of one stitch are used. In the pattern to be formed, FIG.
As shown in FIG. 1, there is a problem in that the stitches are disturbed at the correction points, the sewing finish is irregular, and the appearance is deteriorated.
SUMMARY OF THE INVENTION An object of the present invention is to provide an electronically controlled pattern stitch sewing machine capable of stopping feed amount correction at a specific stitch specified in advance such as the satin stitch.

[0005]

Means for Solving the Problems] electronically controlled pattern stitch sewing machine according to claim 1, as shown in the functional block diagram of FIG. 1, motor for feeding for reciprocating the feed dog in the cloth feeding direction <br And stitch data storage means for storing stitch data of a plurality of patterns, and control for driving a stepping motor for feeding based on feed data among stitch data read from the stitch data storage means. means and the correction means for adding the feed data to the correction amount, in an electronically controlled pattern sewing machine provided with a setting means for setting a correction amount to the correction means, needles are selected pattern identified previously Shaking identification
If the pattern consists of non-specific seams other than seams and specific seams
In this case, the correction means supplements the sewing of the specific stitch.
Without the addition of positive quantities, is then when the sewing of the non-specific stitches
It is characterized in that a correction amount is added .

[0006]

[Action] In an electronically controlled pattern stitch sewing machine according to claim 1, feed dog is reciprocated in the cloth feeding direction by a motors feed, read from the stitch data storing means by the feed motors are controlled The stitch data is controlled based on the feed data. Since the error of the feed amount caused by the error of the mechanical system such as the feed mechanism differs for each sewing machine, in the adjustment stage after the completion of the sewing machine assembly, the feed error is obtained in advance by trial sewing, and the feed error is set via the setting means. When the correction amount is set, the correction means receives the correction amount and adds the correction amount to the feed data. However, this correction is added intermittently not for each feed but for a plurality of feeds.

Here, the selected pattern is specified in advance.
From specific seams with needle swing and non-specific seams other than specific seams
In the case of a pattern, the correction means sets the specific stitch
When sewing, the correction amount is not added,
When sewing is performed, a correction amount is added . So, for example,
When forming the stitches such as satin stitches included in each pattern, the feed correction amount is not added, so that the stitches of the specific stitches are not disturbed by the correction of the feed amount and the pattern regularity is not broken. The appearance of the pattern can be improved.

[0008]

Effects of the Invention According to the electronically controlled pattern stitch sewing machine according to claim 1, the feed motors, the stitch data storing means, and control means for controlling the motor, a correction unit, a setting unit Selected sewing machine
The specified seam with the specified needle swing and the non-specific seam
In the case of a pattern consisting of specific stitches, the correction means
When sewing the specific stitch, the correction amount is not added
When sewing non-specific stitches, a correction amount is added.
With this configuration, for example, when forming a stitch such as a satin stitch, a feed correction amount is not added, so that the stitch of the specific stitch is not disturbed by the correction of the feed amount and pattern regularity is lost. Without this, the appearance of the pattern can be improved.

[0009]

Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 2, the sewing machine main body of the electronically controlled pattern sewing machine M includes a bed 1 and a pillar 2.
, An arm 3, and a head 4, and a presser bar 7 having a presser foot attached thereto and a needle bar 5 having a sewing needle 6 attached thereto are mounted on the head 4. A feed dog is provided, and inside the sewing machine body, like a general electronically controlled sewing machine,
A needle bar vertical movement mechanism that drives the needle bar 5 up and down, a feed dog vertical movement mechanism that drives the feed dog up and down, a needle bar swing mechanism that drives the needle bar 5 to swing left and right, and Feed dog rocking mechanism, a needle bar vertical movement mechanism, a sewing machine motor 20 driving a feed dog vertical movement mechanism, a stepping motor 47 driving a needle bar rocking mechanism, a feed dog rocking mechanism A stepping motor 48 for driving the motor and a control device 40 are provided (see FIG. 4).

A large liquid crystal display 10 is provided on the front surface of the arm portion 3. This display 10 can display, for example, 20 characters.times.3 lines of characters in a dot pattern. The display 10 is provided with a touch key 11 composed of a total of 30 transparent electrodes for pattern selection and command signal input, and one of the touch keys 11 is pressed. Thus, a desired one of the displayed stitch patterns can be selected.

In the vicinity of the head 4, switches such as a start / stop switch 13, a thread cut switch 14, a needle position switch 15, and a reverse stitch switch 16 are provided on the arm 3. An operation panel 9 is provided on the front surface of the upper end. The operation panel 9 has nine function keys (a practical sewing key 91, a character sewing key 92, a pattern sewing key 93, a plus correction key 94, and a minus correction key 9).
5, etc.). The plus correction key 94
Is used to set a feed amount increase correction amount, and a minus correction key 95 is used to set a feed amount decrease correction amount.
Reference numeral 8 is a speed volume for adjusting the sewing speed.

Next, a mechanical structure related to the cloth feeding provided in the sewing machine main body of the sewing machine M will be described.
As shown in FIG. 3, the sewing machine motor 20 for driving the spindle is
Rotational driving force is transmitted to the sewing machine main shaft 23 via the drive pulley 21 and the transmission shaft 22, and the sewing machine motor 20
In order to apply a rotational force to the shuttle 26 by a timing belt 25 mounted between the lower portion of the hook 1 and the shuttle shaft pulley 24, and to move the feed dog 28 up and down by a pair of upper and lower arms 27 linked to the drive pulley 21. Of driving force.

A link mechanism 29 for reciprocating the feed dog 28 in the cloth feeding direction is connected to the feed mechanism 28. A sector gear 30 is provided at one end of the link mechanism 29, and a forward / reverse rotation of a feed stepping motor 48 is provided. The sector gear 30
Are reciprocated so that the feed dog 28 is reciprocally driven in the cloth feeding direction (front-back direction). Sewing machine motor 20
The feed dog 28 while timing the vertical movement of the feed dog 28
The work cloth is moved forward or backward by reciprocating in the feed direction. The sewing machine main shaft 23 is connected to the needle bar 5 in the same manner as a normal sewing machine, and the needle bar is reciprocated up and down by the sewing machine main shaft 23 to perform sewing.

Next, an outline of a control system of the sewing machine M will be described with reference to FIG. The control device 40 has an input interface 41, a microcomputer including a CPU 42, a ROM 43, and a RAM 44, and an output interface 45.
Stop switch 13, operation panel 9, and display 1
0 touch key 11, a timing signal generator 32,
Signals from other keys and switches are supplied, and the output interface 45 outputs a signal from the sewing machine motor 20.
The drive current and the drive pulse signal are supplied to the needle bar swing stepping motor 47, the feed stepping motor 48, and the display controller 49 that drives the display 10, respectively. The timing signal generator 32 is provided in association with the main shaft 23 of the sewing machine, and detects the rotational phase of the main shaft.

In the ROM 43 of the microcomputer, stitch data of a large number of stitch patterns relating to practical sewing, character stitching, and pattern stitching, a control program for selecting a stitch pattern, display data, and a sewing machine A control program for displaying explanation information on usage on the display 10 and display data, a control program for feed correction amount setting control and a control program for feed amount correction control, which are specific to the present application, and the like are input and stored in advance. .

The stitch data of each pattern is sequentially stored by the number of stitches in pairs of stitch swing data for swinging the sewing needle in the left-right direction and feed data for feeding the work cloth, and is included in each pattern. In the case of satin stitching, the feed amount correction is stopped.In order to identify the satin stitching position, the satin stitching feed data is provided with identification data indicating satin stitching. Has an end code.

The RAM 44 has a plus correction key 94
And a correction register for storing a correction rank r set by the minus correction key 95, a correction stitch counter for adding a correction for each correction stitch m, a stitch counter for counting the stitch K from the start of sewing of each pattern, There are provided a number-of-corrections counter for counting the number of corrections L from the start of sewing of each pattern, a swing register and a feed register for storing the amount of needle swing and the amount of feed for each sewing operation, and the like. The RAM 44 is backed up by a small battery.

Next, the feed correction amount setting control will be described with reference to the flowchart of FIG.
1, 2, 3...) Indicate each step. First, in the adjustment stage after the completion of the assembly of the sewing machine M, when an error of the feed amount for feeding the work cloth is measured to set the feed correction amount, for example, when sewing is performed on a trial sewing pattern as shown in FIG. When there is no error, the point a in the figure and the point b in the figure match, but when actually sewn, the point a and the point b do not match due to a feed error, and as shown in FIG. Generates an error D. Therefore, correction ranks 1, 2, and 3 are determined according to the degree of the error D. The correction ranks 1, 2, 3, 4, and 5 are 125 stitches and 100 stitches, respectively.
This indicates the rank to be corrected by the feed amount "1" (for one pulse of the motor 48) for each of the stitches, 75 stitches, 50 stitches, and 25 stitches.

Next, while the power of the sewing machine M is turned on, the routine shown in the flowchart of FIG. 5 is executed during the execution of the main routine before the selection of the pattern, and the correction register is set to zero in the initial setting. When the feed amount is increased and corrected when the shortage of the feed occurs as shown in FIG. 8, when the plus correction key 94 is operated, “Yes” is determined in S 1, and when the correction rank r of the correction register is 4 or less. (S2: No), the correction rank r is incremented by one (S3), and thereafter, the process proceeds to S7, where the correction rank r of the correction register is displayed on the display 10, and the process returns to the main routine. Thus, the plus correction key 9
4 can be operated once, and the correction rank r can be incremented by one. By repeatedly operating the plus correction key 94, the correction rank r can be sequentially incremented.

On the other hand, when the feed amount is to be decreased and corrected, the minus correction key 95 is operated, and the result is Yes in S4.
Only when the correction rank r of the correction register is equal to or higher than -4 (S5: No), the correction rank r is decremented by one (S6). r is displayed on the display 10 and the process returns to the main routine. As described above, the correction rank r can be decremented by one operation of the minus correction key 95, and the correction rank r can be sequentially decremented by repeatedly operating the minus correction key 95. Note that the value of the correction rank r is allowed in a range of -5 to +5.

As described above, the correction register is set to -5 to +5 via the plus correction key 94 and the minus correction key 95.
A desired correction rank r in the range can be set.
However, in the adjustment stage of the sewing machine M, after setting the correction rank r, the trial sewing pattern is sewn to execute the correction rank r.
After confirming that is set correctly, it shall be shipped.

Next, the routine of the feed amount correction control will be described with reference to the flowchart of FIG.
(I = 10, 11, 12,...) Indicate each step,
This control is always executed when a pattern is selected and sewing is actually performed. At the start of sewing of the selected pattern, the feed register and the number of stitches are initialized to zero, the number of corrections counter is initialized to 1, and the number of correction stitches m ( For example, when the correction rank r is 3, 75) is stored in the correction stitch number register.

During the sewing of the selected pattern, the feed data F
Is read out and stored in the sending register (S10), it is determined whether or not it is an end code (S11). If it is not an end code, it is determined whether or not stitch number ≧ corrected stitch number × number of corrections (S12). Since the number of stitches is smaller than the number of correction stitches × 1, it is determined as No, and the process shifts to S18.
In step 8, the count value K of the stitch number counter is incremented by one, and the process returns to the main routine. At a predetermined timing determined from a signal from the timing signal generator 32 in the main routine, the work cloth is fed based on the feed data F. And the needle swing based on the swing data is executed to form a stitch.

Thereafter, similarly, S10 to S12, S18,
Returning to the main routine is repeated, and if the number of stitches becomes equal to the number of corrected stitches × 1 during that time, the determination is Yes in S12 and the process proceeds to S13 to determine whether the stitch is a satin stitch based on the identification data attached to the feed data. If it is not a satin stitch, the process proceeds to S14 to determine whether or not the correction rank r of the correction register is positive. If the correction rank r is positive, "1" is added to the feed data F of the feed register (S1).
5) If the correction rank r is negative, "1" is subtracted from the transmission data F of the transmission register (S16), and then the count value L of the correction counter is incremented by one (S17), and after S18, Returning to the main routine, the work cloth is fed based on the corrected feed data F.

In this way, when it is not a satin stitch, the feed data F is corrected for each correction stitch number.
If the correction is performed at the time of the satin stitch, the seam will be disturbed as described above. Perform the correction. Therefore, in S13, it is determined whether or not it is a satin stitch. If it is a satin stitch, steps S14 to S17 are omitted, and the process proceeds from S13 to S18.

Therefore, even if it is determined that the result of S12 is Yes, S12, S13, S1
8, return, S10 to S13 are repeated, and when it is no longer a satin stitch, the process proceeds from S13 to S14, where the correction of S15 or S16 and the count of the number of corrections of S17 are executed, and the process proceeds to S18. If the correction is omitted a plurality of times due to the satin stitch, the correction is performed continuously a plurality of times. Thus, when the sewing of one selected pattern is completed and the end code is read (S11: Y
es), in S19, the correction number counter is set to "1", the stitch number counter and the correction stitch number counter are each set to "0", and thereafter, the process returns to the main routine.

As described above, the feed data F is corrected by the correction amount based on the preset correction rank, so that the feed error is corrected and the pattern equivalent to the pattern set by the stitch data is obtained. Can be formed. Moreover, the correction of the feed data F is omitted at the location of the satin stitch, and the feed data F is corrected at the place of the stitch other than the satin stitch after the satin stitch, as shown in FIG. In addition, the seam of the satin stitch does not disturb, the seam does not become irregular, and the appearance of the pattern can be enhanced.

In the above-described embodiment, the data for identifying the satin stitch is provided in the feed data. However, data for identifying the start point of the satin stitch and data for identifying the end point may be provided. , And the feed amount of the satin stitch is about 0.1m
m, the satin stitch may be determined from the feed amount of the feed data F, or the satin stitch may be determined based on both the feed data and the swing data. You may. RAM 44
Instead of providing the correction register, a correction register may be provided in a nonvolatile EEPROM.

Next, a modified example in which the above-described embodiment is partially modified will be described with reference to FIG. First, the configuration is such that the error of the forward feed for moving the work cloth forward is ignored, and only the error of the backward feed relative to the forward feed is corrected. in this case,
In the adjustment stage of the sewing machine M, it is assumed that a correction rank r for correcting an error of the backward feed based on the forward feed is set in a correction register. The routine in FIG. 10 is almost the same as the routine in FIG. 6, and therefore, the same steps will be denoted by the same step numbers and description thereof will be omitted, and additional configurations will be described.

In S30 following S13, it is determined whether or not the feed is backward, based on the feed direction identification data attached to the feed data F. Only when the feed is backward, the process proceeds to S14.
In steps S14 to S16, the same correction for the feed data F is executed. Further, in S32 preceding the step of S18, it is determined whether or not backward feeding is performed, and only when the backward feeding is performed, the count value K of the stitch number counter is counted up. That is, only the number of reverse feeds is counted by the stitch number counter, and the reverse feed data is corrected each time the number of reverse feeds becomes the corrected number of stitches. Execute after the end of Even in the case of such a configuration, a beautiful pattern can be formed and the disorder of the satin stitch can be eliminated as in the above-described embodiment.

As another modified example, the correction rank for forward feed and the correction rank for reverse feed are separately set, and the number of stitches for forward feed and the number of stitches for reverse feed are separately set. The feed data of the forward feed is corrected each time the forward feed reaches the number of correction stitches corresponding to the correction rank, and the reverse movement is performed each time the forward feed reaches the correction stitch number corresponding to the correction rank. It is also possible to configure so as to correct the feed data of the feed. Also in this case, the correction is not performed in the satin stitch, but is performed after the end of the satin stitch in the same manner as described above.

The correction rank may be set in a number of steps such as 1 to 10 steps, or the number of stitches may be input and set instead of the correction rank. Is also good. Note that, in addition to the above, various modifications and improvements can be added to the present invention without departing from the technical idea of the present invention. Further, the present invention is applicable to an error correction of a traverse amount in a sewing machine having a traverse mechanism for feeding a work cloth in a needle swing direction (lateral direction).

[Brief description of the drawings]

FIG. 1 is a functional block diagram of the invention according to claim 1;

FIG. 2 is an overall perspective view of an electronically controlled pattern stitch sewing machine according to an embodiment of the present invention .

FIG. 3 is a perspective view showing a mechanical configuration related to cloth feeding for feeding a work cloth;

FIG. 4 is a configuration diagram of a control system of the sewing machine.

FIG. 5 is a flowchart of a routine of a feed correction amount setting control.

FIG. 6 is a flowchart of a routine of a feed amount correction control.

FIG. 7 is an explanatory diagram illustrating a trial sewing pattern.

FIG. 8 is an explanatory diagram of a trial sewing pattern sewn for setting a sewing rank.

FIG. 9 is an enlarged view of a satin stitch in a feed direction.

FIG. 10 is a diagram corresponding to FIG. 6 according to a modification.

FIG. 11 is a diagram corresponding to FIG. 9 according to the prior art.

[Explanation of symbols]

 M Electronically controlled pattern sewing machine 9 Operation panel 10 Display 28 Feed dog 40 Control device 48 Stepping motor for feeding 94 Positive correction key 95 Minus correction key

Claims (1)

(57) [Claims] 1. A and feed motors for reciprocating the feed dog in the cloth feeding direction, the stitch data storing means for storing stitch data of a plurality of patterns, sewing read from stitch data storing means Control means for driving a stepping motor for feeding based on feed data of the eye data, correcting means for adding a correction amount to the feed data, and setting means for setting a correction amount in the correcting means. In an electronically controlled pattern stitch sewing machine, a selected pattern is a specific stitch with a predetermined needle swing.
And a pattern consisting of non-specific seams other than the specific seam,
The correction means is configured to correct the amount of correction when sewing the specific stitch.
No correction is made when sewing the non-specific stitch.
An electronically controlled pattern sewing machine characterized by adding a quantity .