JP2002355462A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine easily for performing stop sewing of a stitch pattern whose sewing width changes continuously with an excellent appearance. SOLUTION: The sewing machine is provided with a stop sewing data preparation means for preparing stop sewing data on the basis of only two pieces of data which are the stitch data of the stitch pattern at a position closest to the position to perform stop sewing on a material 6 to be sewn and the stitch data at its vicinity, and a stop sewing control means for forming stop sewing on a material to be sewn by changing the moving amount of a sewing needle 5 by a needle swing device 100 stitch by stitch on the basis of the stop sewing data over the set number of stop sewing stitches. In performing stop sewing, the feed pitch of the material to be sewn is made smaller than a prescribed feed pitch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a sewing machine.

[0002]

2. Description of the Related Art A cloth feeding device for transporting a sewing material at a predetermined feed pitch in a transport direction for each needle, and a needle capable of moving a sewing needle by an arbitrary amount of movement in a direction orthogonal to the transport direction of the workpiece. 2. Description of the Related Art Sewing machines provided with a swinging device and changing a moving amount of a sewing needle by the needle swinging device to repeat a unit pattern on a workpiece to form a stitch pattern are conventionally known. In such a sewing machine, stitch data for determining the amount of movement of the stitches required to form the stitch pattern is stored in storage means corresponding to the number of stitches, and for each stitch based on the stitch data. Pattern sewing control means for changing the amount of movement of the sewing needle by the needle swinging device to form a seam pattern is provided. It is also conventionally known that a sewing machine performs stop sewing in order to prevent fraying of a thread end at the start or end of sewing.

[0003] As a stitch pattern formed on a sewing machine for moving a sewing needle in a direction perpendicular to a conveying direction of a workpiece, a sewing width W from a pattern start point to a pattern end point as shown in FIG. Constant zigzag (staggered) pattern 5
0 and a stitch pattern 56 that repeatedly forms a unit pattern 56A whose stitch width continuously changes as shown in FIG.
There is. The sewn object is transported in the direction C by the cloth feeding device, and the sewing needle is moved in the direction AB by the needle swinging device.
Although FIG. 10B illustrates a circular pattern, FIG.
Is another example of the unit pattern 56A in which the sewing width is changed.
4 shows a scalloped pattern formed by four needles. FIG.
1 (a) is a scalloped pattern in which the arc portion faces right, and FIG. 11 (b) is a scalloped pattern in which the arc portion faces left. The scalloped pattern is a crescent-shaped shell-shaped pattern and is used, for example, to sew a front part of a sewn object such as a girdle or a body suit, and gives the sewn object a sense of quality.

FIG. 12A shows an example of the stitches 52 and 54 at the start and end of the staggered pattern 50. The amount of movement of the sewing needle at the time of performing the stitches 52 and 54 is performed by using the amount of movement of the sewing needle required to form the staggered pattern 50 as it is, and reducing the feed pitch of the workpiece by the cloth feeder. ing. FIG. 12B shows the lock stitches 52 and 54 of FIG. 12A without changing the feed pitch.
9 shows a seam pattern when the above-mentioned is performed.

[0005]

However, in the case of the stitch pattern 56 in which the stitch width changes continuously, the stitch data for forming the stitch pattern is used as the moving amount of the sewing needle in order to perform the stitching. If the method of reducing the transport pitch of the sewing object by using the movement amount determined on the basis as it is is adopted, the appearance deteriorates. Taking the case of the scalloped pattern shown in FIG. 13 as an example, as shown in FIG. 13A, the stop stitch 58 at the start of the stitch pattern 56 and the stop stitch 60 at the end of the stitch are the start of the stitch pattern 56 in FIG. In the case of the example shown in the figure, a part of the lock stitches 58 and 60 has a shape that protrudes extremely leftward, so that the appearance is improved. bad.

An apparatus disclosed in Japanese Patent Application Laid-Open No. 2000-157766 is an example of an apparatus for creating lock stitch data used in a sewing machine that repeatedly forms a predetermined stitch pattern on a workpiece. This device calculates the amount of movement of the sewing needle based on the fixed stitch data corresponding to an arbitrary number of stitches in the stitch data.
The stitch data corresponding to the arbitrary number of stitches and the stitch data based on at least two pieces of stitch data adjacent to the stitch data are derived so as to be close to the average value of the moving amount of the stitch. In this method, it is necessary to perform the above calculation for all the set number of stitches of the lock stitch. Further, since this apparatus is provided with the stop table stored corresponding to the transfer of the sewing object for each step, a large storage area in the pattern memory is required, resulting in an increase in cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sewing machine which can easily perform stitching of a stitch pattern in which a stitch width changes continuously, with a small storage area in a pattern memory and with good appearance. Another object of the present invention is to provide a sewing machine capable of reliably preventing the thread end at the start or end of sewing from being frayed by a simple method.

[0008]

According to the present invention, there is provided a sewing needle which can move up and down, and a cloth feeder for feeding a sewing object at a predetermined feed pitch in the feed direction for each needle. A feed pitch changing device capable of changing the feed pitch, a needle oscillating device capable of moving the sewing needle to an arbitrary needle oscillating position in a direction orthogonal to the transport direction, and a unit pattern formed by a predetermined number of stitches. Seam pattern selecting means to select,
Storage means for storing stitch data for determining the needle swing position for forming the unit pattern on the sewing object in association with each number of stitches, and setting means for setting the number of stitching stitches; Based on the stitch data, pattern stitching control means for forming a stitch pattern by repeating the selected unit pattern on the sewing object by changing the swing position of the needle swing device for each needle, A stitch data creating device for creating stitch data based on two pieces of stitch data of the stitch pattern at a position closest to the position where the stitch is to be performed on the workpiece and stitch data in the vicinity thereof; Over the number of stitches set by the stitch number setting means, sewing is performed by changing the needle swing position of the needle swing device for each needle based on the stitching data. A sewing machine comprising: a lock stitch control unit for forming a lock stitch on an object; and in the case of the lock stitch, the feed pitch of the sewing target material is made smaller than the predetermined feed pitch by the feed pitch changing device. Provided.

The fixed stitch data of the fixed stitch at the end of the sewing is created by alternately repeating the last stitch of the stitch pattern and the stitch data in the vicinity thereof.

The fixed stitch data of the fixed stitch at the start of sewing is generated by alternately repeating the stitch data of the zeroth needle of the stitch pattern and the stitch data in the vicinity thereof.

A stitch obtained by multiplying a stitch width derived from the stitch data of the stitch pattern at a position closest to a position on the work to be stitched and a stitch data in the vicinity thereof by a predetermined coefficient. Lock stitch data can also be created so as to have a width.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a sewing machine according to the present invention will be described. As shown in FIGS. 1 and 2, the sewing machine according to the present embodiment includes a sewing machine frame 1, a sewing machine main shaft 2 rotatably supported in the sewing machine frame 1, and a needle bar that can move up and down in conjunction with the main shaft 2. 3, a feed dog (cloth feeder) 4 for performing a feed motion for transporting the workpiece in the transport direction (C direction in FIG. 2) in conjunction with the main shaft 2; In the direction perpendicular to the transport direction (AB in FIG. 1)
The needle swinging device 100 which can move by an arbitrary moving amount in the direction ()) is provided. A sewing needle 5 is fixed to the lower end of the needle bar 3.

A cloth presser 8 is disposed above the sewing machine bed 7 that supports the workpiece 6 and faces the feed dog 4. The presser foot 8 descends during sewing and presses the workpiece 6. The feed dog 4 draws an elliptical motion trajectory D up and down and left and right in conjunction with the main shaft 2, and the sewing object sandwiched between the feed dog 4 and the sewing machine bed 7 while floating upward from below. 6 in the transport direction C. The sewing machine frame 1 is further provided with a feed pitch adjusting dial 9, a feed pitch adjusting dial 40 for fastening sewing, and an operation panel 10. The feed pitch adjusting dial 9 sets a carry amount (feed pitch) for each stitch. The feed pitch adjusting dial 40 for the lock stitch sets the feed pitch at the time of the lock stitch. The feed pitch set by the feed pitch adjusting dial 9 and the feed pitch adjusting dial 40 for the stitching is selected by moving a feed adjusting body (not shown) constituting the feed mechanism. Is done.
Usually, the feed adjusting body is biased in one direction by a spring. Then, the sewn object is fed by the set amount of the feed pitch adjustment dial 9. Also, at the time of stop sewing, as shown in FIG.
The lock stitch solenoid 41 is driven to move the feed adjusting member against the urging force of the spring. And the sewing object is
The feed is performed at the feed pitch of the feed pitch adjusting dial 40 for fixing sewing. The feed stitching solenoid 41, the feed feed pitch adjusting dial 40 for the feed stitch, and the feed adjuster constitute a feed pitch changing device.

The operation panel 10 has a stitch pattern selection switch 10 for selecting a unit pattern formed by a predetermined number of stitches.
a, a stitch type selection switch 10b, a stitch number setting switch 10c for setting the number of stitches, a pattern start position selection switch 10d, a pattern stitch number setting switch 10e for setting the number of stitches, and the like are provided. ing. The fixing stitching mode selection switch 10b is a switch for selecting any of various fixing stitching methods.
Hereinafter, only the case where the fastening method according to the present invention is selected will be described. In addition, on the operation panel 10, in addition to the above, it is possible to perform various selections or settings such as presence / absence of fixed stitches at the start of sewing and presence / absence of fixed stitches at the end of sewing.

The needle swing device 100 includes a needle bar support 11 and
It includes a stepping motor 12, a needle swing link 13, and a needle bar support shaft 14. Needle bar support 11 is needle bar 3
Is supported so that it can move up and down. The stepping motor 12 is capable of intermittently rotating its output shaft 12a in both forward and reverse directions.

A needle swing driving arm 15 is fixed to the output shaft 12a of the stepping motor 12, and one end of the needle swing link 13 is rotatably connected to the needle swing drive arm 15 via a needle swing link pin 13a. I have. The needle bar support shaft 14 is
One end is connected to the other end of the needle swing link 13 via a needle swing link pin 13 b via a needle bar support shaft holder 16, and the other end is fixed to the needle bar support 11. The needle bar support shaft 14 is supported by first and second needle bar support bearings 17a and 17b attached to the sewing machine frame 1 so as to be slidable in the axial direction.

When the output shaft 12a of the stepping motor 12 rotates, the needle bar support shaft 14 reciprocates via the needle swing drive arm 15 and the needle swing link 13. Various patterns are sewn by a combination of the reciprocating motion of the needle bar 3 due to the reciprocating motion of the needle bar support base shaft 14 and the cloth feed orthogonal thereto.

Next, a control system of the sewing machine according to the present embodiment will be described with reference to the block diagram shown in FIG. Control device 2
Reference numeral 0 includes a ROM 22 for storing programs and data necessary for controlling the sewing machine such as a sewing work program, a CPU 24 for performing various calculations and processes, and a RAM (storage means) 26. The RAM 26 stores stitch data for determining the amount of movement of the sewing needle 5 required to form the unit pattern 56A having a predetermined number of stitches on the workpiece 6 in association with each stitch, and is calculated by the CPU 24. The stored data and the like are stored. The CPU 24 is connected to an input / output interface 28.

The input section of the input / output interface 28 includes a pedal switch 30, a stitch pattern selection switch 10a on the operation panel 10, a stitch type selection switch 10b, a stitch stitch number setting switch 10c, a pattern start position selection switch 10d, and a pattern stitch. The stitch number setting switch 10e is connected. The pedal switch 30 is a foot-operated type,
The start signal of the pattern sewing is output by the previous step, and the end signal of the pattern sewing is output by the reverse step.

A sewing machine motor 32 for rotating the main shaft 2 of the sewing machine and a stepping motor 12 for moving the needle bar 3 are connected to the output of the input / output interface 28 via motor drivers 33 and 34, respectively.

FIG. 4A is a view for explaining stitch data of a unit pattern 56A of a scalloped pattern formed by 24 stitches, and FIG. 4B is a view for explaining stitch data of the unit pattern 56A stored in the RAM 26. In (a), M0, M1, M2... Indicate each needle drop point, and the subscript thereof indicates the number of needles. O is sewing needle 5
The distance Dx from the reference position to each needle drop point is the stitch data, and the stitch data is stored in the RAM 26 in association with the number of stitches. That is, D0, D1, D2... Indicate stitch data, and the subscripts indicate the corresponding stitch numbers. Since the unit pattern 56A is repeatedly formed on the workpiece, the stitch data D1 for the first needle is provided next to the stitch data D24 for the first needle.

In the case of the scallop pattern 56A, for example, in the case of the scallop pattern 56A, the pattern start position selection switch 10d starts the "start of mountain" where the sewing starts from the widest position in the center of the scallop pattern 56A. "Valley start" which can start sewing from the position can be selected. FIG.
Indicates the stitch pattern 56 and the stitch data in the case of "start of valley", and in the case of "start of hill", the stitch pattern is started with the needle drop point M12 in FIG.

Next, the control operation of the control device 20 according to the present embodiment will be described with reference to the flowcharts of FIGS.
This flowchart shows only the control operation by the control device 20, and does not show the operation by the operator. For example, it is assumed that, before the operation according to this flowchart, the operator operates the switches on the operation panel 10 to select the stitch pattern and the stitching method, and the number of stitching stitches and the pattern start position are set.

In the drawing, S1, S2,... Indicate the numbers of the processing order (steps). First, in S1, it is determined whether or not there is a sewing start request due to the front depression of the pedal switch 30, and if there is a request, the process proceeds to S2, and it is determined whether or not the stop sewing at the start of sewing is selected. If it is selected, the lock stitch solenoid 41 is driven in S2a, and the feed pitch is switched to the feed pitch set by the feed pitch adjustment dial 40 for the lock stitch. Next, stop sewing data is created in S3. As shown in FIG. 7, the method of generating the stitched stitch data is to change the stitch data D0 of the 0th stitch and the stitch data D1 of the first stitch of the stitch pattern 56 to a stitch stitch number setting switch 1
The stitch data is alternately repeated for the number of stitches set at 0c. In FIG. 7, the set number of stitches for the lock stitch is 5
Is shown. Further, for convenience of explanation, the number of stitches constituting the unit pattern 56A is shown as the number of stitches Mx for convenience of description, so that one stitch is set next to 24 stitches, but the number of stitches set by the pattern stitching stitch number setting switch 10e is set. Is each unit pattern 5
It is the total number of stitches at 6A, so next to 24 stitches is 25
It is calculated as a needle.

After creating the sewing data in step S3, in step S4
Then, the sewing operation is performed. That is, based on the prepared stitch data, the stepping motor 12 is driven in a predetermined step, the needle swinging device 100 moves the sewing needle 5 in a direction orthogonal to the transport direction, and moves the sewing needle 5 up and down.
Further, the sewing object 6 is conveyed by the feed dog 4 by one stitch in the conveying direction at the feed pitch set by the feed pitch adjusting dial 40 for the stop sewing. In S5, it is determined whether or not the number of stitches set by the number of stitches setting switch 10c has been reached. If the number has not reached, S4 is repeated to set the number of stitches 58 as shown in FIG. Is executed.

When the number of stitches reaches the set number in S5, the process proceeds to S5a. In S5a, the energization of the stop sewing solenoid 41 is stopped, and the feed pitch is switched to the normal feed pitch set by the feed pitch adjustment dial 9. End of S5a and S
If the stop stitch at the start of sewing is not selected in step 2, the process proceeds to S6, where the stitch data for pattern stitching is stored in the RAM.
Read from 26. Then, proceeding to S7, the stepping motor 12 is driven in a predetermined step by the stitch data read in S6, the needle 5 is moved by the needle swinging device 100 in a direction orthogonal to the transport direction, and the sewing needle 5 is moved up and down. The workpiece 6 is conveyed by the feed dog 4 by one stitch in the conveying direction. In S8, it is determined whether or not there is a sewing end request due to the depression of the pedal switch 30, or whether or not the number of pattern stitches set by the pattern stitch stitch number setting switch 10e has been reached. If the number of stitches has not been reached, S7 is repeated to execute the required pattern sewing.

When the pattern sewing is completed, the process proceeds to S9, where it is determined whether or not the stop sewing at the end of the sewing is selected. If the stop sewing is selected, the stop sewing solenoid 41 is driven in S9a. The feed pitch is switched to the feed pitch set by the feed pitch adjusting dial 40 for the lock stitch. Next, stop sewing data is created in S10. As shown in FIG. 8, the method of creating the lock stitching data is as shown in FIG.
The stitch data D15 of 15) and the stitch data D16 of the next needle drop point M16 are alternately repeated by the number of stitches set by the number-of-stitching-stitch-number-setting switch 10c to obtain stitching data. FIG. 8 shows an example in which the set number of stitches for the stitching is four.

Subsequently, the program proceeds to S11, where a sewing operation for one stitch is performed. In S12, the number of stitching stitches setting switch 10c
It is determined whether or not the number of stitches set in the step (1) has been reached. If the number of stitches has not been reached, S11 is repeated to execute the stitching 60 with the set number of stitches as shown in FIG. Upon completion of the stop stitching of the set number of stitches, the process proceeds to S12a. In S12a, the energization of the stop sewing solenoid 41 is stopped, and the feed pitch is switched to the normal feed pitch set by the feed pitch adjusting dial 9. Next, the process proceeds to S13, in which the thread is cut, and the sewing operation ends.

In each of the examples shown in FIGS. 7 and 8, the "start of valley" is selected by the pattern start position selection switch 10d. An example of the lock stitch 58 is shown in FIG.

Although the sewing machine according to the present invention has been described based on the embodiment shown in the drawings, the present invention is not limited to this embodiment and can be variously modified. For example, in the above embodiment, as shown in FIG. 4A, the moving amount of the sewing needle is determined by the distance Dx (stitch data) from the reference position O (base line) of the sewing needle 5 to each needle drop point. , The needle swing position has been changed. Instead, the stitch data is stored in the reference position O
It is also conceivable to prepare a scalloped pattern or the like by preparing the position data (absolute position) from the position and changing the needle swing position.

For example, in the case of stop stitching at the start of sewing, an example is shown in which stitch data D0 and stitch data D1 of the first stitch of the stitch pattern 56 are alternately repeated to generate stitch data. Second instead of needle stitch data D1
Needle stitch data D2 or third needle stitch data D
3 can be used. Similarly, in the case of the lock stitch at the end of sewing, an example in which the stitch data D15 of the last needle M15 of the stitch pattern 56 and the stitch data D16 of the next needle drop point M16 at the end of the pattern stitch are alternately repeated to generate the lock stitch data. But the next needle drop point M1
Instead of the stitch data D16, the stitch data D14 of the needle drop point M14 just before the stitch, or the stitch data D13 of the needle drop point M13 just before the stitch data D13 can be used.

Further, it is also possible to create stop stitching data so as to obtain a stitch width obtained by multiplying a stitch width derived from the above two stitch data by a predetermined coefficient. In this case, the coefficient is set to an arbitrary value (for example, 0.1 to
1.0). At this time, the stitches at the beginning of sewing are formed based on the left needle drop point, and the stitches at the end of sewing are formed based on the final needle drop position, so that the appearance after sewing is good.

[0033]

According to the present invention, the stitching data creating apparatus uses the stitching data creation device to generate only the stitch data of the stitch pattern at the position closest to the position where the stitching is performed on the workpiece and the stitch data in the vicinity thereof. The stitching position is created on the workpiece by changing the needle swing position by the needle swinging device for each stitch over the set number of stitches based on the stitching data over the set number of stitches. Equipped with a stop sewing control means to form, and in the case of stop sewing, since the feed pitch of the workpiece is smaller than a predetermined feed pitch, the stop sewing data of the stitch pattern in which the sewing width changes continuously can be easily created. The sewing can be performed with good appearance.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of an embodiment of a sewing machine according to the present invention.

FIG. 2 is a diagram showing a main part of the present embodiment.

FIG. 3 is a block diagram of the present embodiment.

4A is a diagram for explaining a unit pattern of a scalloped pattern formed by 24 stitches, and FIG. 4B is a diagram for explaining stitch data of the unit pattern stored in a RAM;

FIG. 5 is a flowchart showing the operation of the present embodiment.

FIG. 6 is a flowchart showing the operation of the present embodiment.

FIG. 7A is a diagram showing pattern stitching and stop stitching according to the present embodiment, and FIG. 7B is a diagram showing stitch data and stop stitching data thereof.

8A is a diagram showing pattern stitching and stop stitching according to the present embodiment, and FIG. 8B is a diagram showing stitch data and stop stitching data thereof.

FIG. 9 is a diagram illustrating an example of pattern stitching and stop stitching at the start of stitching when “start of mountain” of a scalloped pattern is selected.

10A and 10B are diagrams showing patterns that can be sewn by a sewing machine having a needle swinging device, wherein FIG. 10A is a diagram showing a staggered pattern, and FIG. 10B is a diagram showing a pattern in which a circular unit pattern is repeated.

11A and 11B are diagrams showing scalloped patterns, in which FIG. 11A shows a scalloped pattern in which an arc portion faces rightward, and FIG. 11B shows a scalloped pattern in which an arc portion faces leftward.

12A shows an example of a stitch pattern at the start and end of a staggered pattern, and FIG. 12B shows a stitch pattern when the staggered pattern of FIG.

13 (a) shows an example of a stitch at the start and end of a scalloped pattern, and FIG. 13 (b) shows a stitch pattern when the scalloped pattern of (a) is formed without performing the stitch.

[Explanation of symbols]

Reference Signs List 4 feed dog (cloth feeder) 5 sewing needle 6 sewing object 9 feed pitch adjustment dial 10 operation panel 10a stitch pattern selection switch 10c number of stitch stitching number setting switch 12 stepping motor 20 controller 26 RAM 40 feed pitch adjustment dial for stitch sewing (Feed pitch changing device) 41 Lock stitch solenoid (Feed pitch changing device) 56 Stitch pattern 56A Unit pattern 58, 60 Lock stitch 100 Needle swing device

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Claims (4)

[Claims] 1. A sewing needle which can move up and down, a cloth feeder which conveys an object to be sewn at a predetermined feed pitch in a conveying direction for each stitch, a feed pitch changing device which can change the feed pitch, and the sewing needle. A needle swinging device that can be moved to an arbitrary needle swinging position in a direction orthogonal to the transport direction; a stitch pattern selecting means for selecting a unit pattern formed by a predetermined number of stitches; and the unit pattern on a sewing object. Based on the stitch data based on the stitch data for storing the stitch data for determining the needle swing position for forming the number of stitches for setting the number of stitches. Pattern sewing control means for repeating the selected unit pattern on the sewing object to form a stitch pattern by changing a needle swing position by the needle swinging device for each needle; and a stop sewing on the sewing object. Where it takes place A stitch data creating device that creates stitch data based on two pieces of stitch data of the stitch pattern at the closest position and stitch data in the vicinity thereof; A lock stitch control means for forming a lock stitch on a workpiece by changing a needle swing position by the needle swing device for each needle based on the lock stitch data; A sewing machine characterized in that a feed pitch of a workpiece is made smaller than the predetermined feed pitch by a pitch changing device. 2. The sewing machine according to claim 1, wherein the fixed stitch data of the fixed stitch at the end of the sewing is created by alternately repeating the last stitch of the stitch pattern and the stitch data in the vicinity thereof. 3. The stitch data of the stitch at the start of sewing is generated by alternately repeating the stitch data of the 0th stitch of the stitch pattern and the stitch data in the vicinity thereof. Sewing machine. 4. A sewing coefficient obtained by multiplying a sewing width derived from two data of the stitch data of the stitch pattern at a position closest to a position where a stitch is to be performed on a workpiece and a stitch data in the vicinity thereof by a predetermined coefficient. 2. The sewing machine according to claim 1, wherein the stop sewing data is created so that the sewing width can be set.