KR20020077164A - Sewing machine - Google Patents

Abstract

PURPOSE: Provided is a sewing machine which easily performs stop sewing of a stitch pattern whose sewing width changes continuously with an excellent appearance. CONSTITUTION: A sewing machine comprises: 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

Sewing machine {SEWING MACHINE}

The present invention relates to a sewing machine.

A needle vibrating device is provided with a cloth conveying device for conveying a to-be-sealed object at a predetermined feed pitch in a conveying direction for each needle, and a needle vibrating device capable of moving the sewing needle at an arbitrary movement amount in a direction orthogonal to the conveying direction of the to-be-sealed object. The sewing machine which forms a seam shape by repeating a unit shape on a to-be-sealed object by changing the movement amount of the sewing needle by is conventionally known. In such a sewing machine, the seam data for determining the amount of movement of the sewing needle required to form the seam shape is stored in correspondence to the number of needles, and the needle vibrator for each needle based on the seam data. Shape sewing control means for changing the amount of movement of the sewing needle to form a seam shape is provided. It is also known in the art to perform a lock stitch to prevent loosening of the end of sewing at the sewing machine or at the sewing end.

A seam shape formed in the sewing machine for moving the sewing needle in a direction orthogonal to the conveying direction of the object to be stitched, and the sewing width W is constant until the shape end point is reached from the shape starting point as shown in FIG. 10 (a). As shown in Fig. 10 (b), there is a seam 56 which repeatedly forms a unit shape 56A in which the stitch width varies continuously. In addition, the to-be-sealed material is conveyed to C direction by the cloth feed apparatus, and a sewing needle moves to AB direction by the needle vibrator. Although FIG. 10 (b) illustrates a circular shape, FIG. 11 shows a scallop shape formed of 24 needles as another example of the unit shape 56A in which the sewing width is changed. Fig. 11 (a) shows a scallop shape with the arc portion facing to the right, and Fig. 11 (b) is a scallop shape with the arc portion facing to the left. The scallop shape is a crescent-shaped shell, which is used for sewing the front part of the sewing material such as a girdle or a bodysuit to give the sewing material a high quality.

12 (a) shows an example of the lock stitches 52 and 54 of the zigzag shape sewing start and sewing finish. The movement amount of the sewing needle at the time of performing the lock stitch 52, 54 uses the movement amount of the sewing needle required to form the zigzag shape 50 as it is, and the transfer pitch of the to-be-sealed object by the cloth transfer device. By making it smaller. FIG. 12 (b) shows a seam shape when the lock stitches 52 and 54 of FIG. 12 (a) are performed without changing the conveyance pitch.

However, in the case of the seam shape 56 in which the sewing width is continuously changed, the amount of movement determined based on the seam data for forming the seam shape as the movement amount of the sewing needle is used as it is to perform the lock stitch. Adopting a method for reducing the conveyance pitch is not good appearance. Referring to the case of the scallop shape shown in Fig. 13 as an example, as shown in (a), the seam-shaped lock stitch 58 at the start of sewing and the lock end 60 at the end of sewing are seam-shaped (b). Since the sewing start part 57 and the sewing end part 59 of 56) are simply reduced in the conveying direction, in the case of the illustrated example, a part of the lock stitches 58 and 60 protrudes to the extreme left. Not good.

There is an example disclosed in Japanese Patent Laid-Open No. 2000-157766 as an apparatus for creating lock stitch data used for a sewing machine which repeatedly forms a predetermined seam shape on such a to-be-sealed material. The device comprises at least two movement amounts of sewing needles based on lock stitch data corresponding to an arbitrary number of stitches of seam data, seam data corresponding to an arbitrary number of stitches, and seam data adjacent to the seam data. Based on the seam data, it can be derived to be near the average value of the movement amount of the seam. This method needs to make the above calculation for all of the number of needles of the set lock stitch. Moreover, since this apparatus is provided with the stop table stored corresponding to the conveyance of every one step of the to-be-sealed object, the memory area in a shape memory is needed a lot and the cost has risen.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sewing machine in which a seam-shaped lock stitch in which the sewing width is continuously changed can be made small in size and simple in appearance in the shape memory.

It is another object of the present invention to provide a sewing machine which can reliably prevent loosening of the end of sewing start or end of sewing in a simple manner.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the principal part of embodiment of the sewing machine which concerns on this invention.

Fig. 2 is a diagram showing main parts of the present embodiment.

3 is a block diagram of the present embodiment.

Fig. 4 is a diagram for explaining a scallop-shaped unit shape formed of 24 needles, and (b) a unit-shaped seam data stored in RAM.

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

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

Fig. 7 (a) is a view showing the sewing of a shape and a lock stitch according to the present embodiment, and (b) is a view showing the seam data and the lock stitch data.

Fig. 8 is a diagram showing shape sewing and lock stitch according to the present embodiment, and (b) shows seam data and lock stitch data thereof.

The figure which shows the example of the shape sewing and the lock stitch of the sewing start when the scallop-shaped "mountain start" is selected.

FIG. 10 is a view showing a shape that can be sewn with a sewing machine having a needle vibrator, (a) is a zigzag shape, and (b) is a shape of repeating a circular unit shape.

Fig. 11 shows a scallop shape, in which (a) shows a scallop shape with the arc portion facing to the right, and (b) shows a scallop shape with the arc portion facing to the left.

Fig. 12 (a) shows an example of the zigzag sewing start and end of the lock stitch, and (b) shows the seam shape when the zigzag shape of (a) is formed without performing the lock stitch. .

Fig. 13 (a) shows an example of the lock stitch of the scallop-shaped sewing start and end, and (b) shows the seam shape when the scallop-shaped of (a) is formed without performing the lock stitch. .

※ Explanation of symbols about main part of drawing ※

4: feed tooth (cloth feed device) 5: sewing needle

6: Sewing object 9: Feed pitch adjustment dial

10: operation panel 10a: seam selection switch

10c: Latch stitch needle setting switch

12: stepping motor 20: controller

26: RAM

40: Feed pitch adjustment dial (feed pitch change device) for lock stitch

41: Lock stitch solenoid (feed pitch changer)

56: seam shape 56A: unit shape

58, 60: Lock Stitch 100: Needle Vibrator

In order to achieve the above object, according to the present invention, a sewing needle capable of moving and moving, a cloth transfer device for conveying the object to be sewing at a predetermined transfer pitch in the transfer direction, and a transfer pitch change device capable of changing the transfer pitch; A needle vibrator capable of moving the sewing needle to an arbitrary needle vibration position in a direction orthogonal to the conveying direction, seam shape selecting means for selecting a unit shape formed by a predetermined number of needles, and the unit on the sewing object Memory means for storing the seam data for determining the needle vibration position for forming the shape corresponding to each needle number, lock stitch number setting means for setting the number of needles of the lock stitch, and each needle based on the seam data By repeating the selected unit shape on the sewing object by changing the needle vibration position by the needle vibrator each time to form a seam shape Lock stitch data for creating lock stitch data by means of two pieces of shape sewing control means, the seam-shaped seam data at the position closest to the position at which the lock stitch on the sewing object is performed, and the seam data in the vicinity thereof. The lock which forms a lock stitch on a to-be-sealed object by changing the needle vibration position by the said needle vibrator for each needle based on the said lock stitch data over the number of needles set by the creation apparatus and the said lock stitch needle number setting means. A sewing machine is provided, wherein the sewing control means is provided, and at the time of the lock stitch, the conveying pitch of the object to be sealed is made smaller than the predetermined conveying pitch by the conveying pitch changing device.

The lock stitch data of the lock stitch at the end of sewing is created by alternately repeating the seam-shaped final needle and seam data in the vicinity thereof.

The lock stitch data of the lock stitch at the start of sewing is created by alternately repeating the seam data in the seam-shaped zero needle and the seam data in the vicinity thereof.

The lock width obtained by multiplying the stitch width derived from the two seams of the seam-shaped seam data at the position closest to the position where the lock stitch on the sewing object is performed and the seam data at the vicinity thereof by a predetermined coefficient. Stitch data can also be created.

Next, an embodiment of the sewing machine according to the present invention will be described. 1 and 2, the sewing machine according to the present embodiment includes a sewing machine frame 1, a sewing machine spindle 2 supported so as to be rotatable in the sewing machine frame 1, and a needle capable of moving in and out in conjunction with the spindle 2; A feed tooth (cloth feed device) 4 and a needle bar 3 for carrying out a conveying motion for conveying the object to be conveyed in the conveying direction (C direction in FIG. 2) in conjunction with the rod 3, the main shaft 2; ) Is provided with a needle vibration device (100) which can be moved at any movement amount in a direction orthogonal to the conveying direction of the object (6). The sewing needle 5 is fixed to the lower end of the needle bar (3).

On the upper side of the sewing machine bed 7 which supports the to-be-sealed material 6, the cloth pressing part 8 is arrange | positioned facing the feed tooth 4. This cloth pressing part 8 descends at the time of sewing, and presses the to-be-processed object 6. The feed tooth 4 draws an elliptical motion trajectory D up, down, left and right in conjunction with the main shaft 2, and is held between the feed teeth 4 while being lifted upward from the bottom of the sewing machine bed 7. The article 6 is conveyed in the conveyance direction C. FIG. The sewing machine frame 1 is further provided with a feed pitch adjusting dial 9, a feed pitch adjusting dial 40 for lock stitches, and an operation panel 10. The feed pitch adjusting dial 9 sets a conveying amount (feed pitch) for each needle. The feed pitch adjustment dial 40 for lock stitch sets the feed pitch at the time of the lock stitch. And the feed pitch set by the feed pitch adjusting dial 9 and the feed pitch adjusting dial 40 for lock stitch is selected by the movement of the feed adjusting body (not shown) which comprises a feed mechanism.

Usually the feed regulator is biased in one direction by a spring. The to-be-sealed material is sent by the set amount of the feed pitch adjustment dial 9. At the time of the lock stitch, the lock stitch solenoid 41 shown in FIG. 3 is driven to move the feed adjuster against the biasing force of the spring. And the to-be-sealed material is sent to the conveyance pitch of the conveyance pitch adjustment dial 40 for lock stitches. The transfer pitch change device is constituted by the lock stitch solenoid 41, the transfer pitch adjustment dial 40 for the lock stitch, and the transfer control body.

The operation panel 10 has a seam shape selection switch 10a for selecting a unit shape formed by a predetermined number of needles, a lock stitch method selection switch 10b, and a lock stitch needle number setting switch for setting the number of needles of the lock stitch. 10c, a shape start position selection switch 10d, a shape sewing needle number setting switch 10e for setting the number of needles of the seam, and the like are arranged. The lock stitch method selection switch 10b is a switch for selecting which one of various lock stitch methods is to be adopted, but only the case where the lock stitch method according to the present invention is selected will be described below. In addition to the operation panel 10, it is possible to make various selections or settings as well as the presence or absence of the lock stitch at the start of sewing, the presence or absence of the lock stitch at the end of sewing.

The needle vibrator 100 includes a needle bar support 11, a stepping motor 12, a needle vibration link 13, and a needle bar support shaft 14. The needle bar support 11 supports the needle bar 3 so as to be movable. The stepping motor 12 can intermittently rotate the output shaft 12a in any of the normal and reverse directions.

The needle vibration drive arm 15 is fixed to the output shaft 12a of the stepping motor 12, and one end of the needle vibration link 13 is rotatably connected to the needle vibration drive arm 15 through the needle vibration link pin 13a. do. The needle bar support shaft 14 is connected to the other end of the needle vibration link 13 by the needle vibration link pin 13b through the needle rod support shaft surrounding portion 16 and the other end of the needle bar support 11. Is fixed to. The needle bar support shaft 14 is supported by the first and second needle bar support bearings 17a and 17b attached to the sewing machine frame 1 to enable axial sliding.

When the output shaft 12a of the stepping motor 12 rotates, the needle bar support shaft 14 reciprocates through the needle vibration driving arm 15 and the needle vibration link 13. Various sewing is performed by the combination of the reciprocating motion of the needle bar 3 by the reciprocating motion of the needle bar support base 14, and the cloth feed orthogonal to it.

Next, the control system of the sewing machine according to the present embodiment will be described based on the block diagram shown in FIG. The control device 20 is provided with a ROM 22 storing programs and data necessary for controlling a sewing machine such as a sewing work program, a CPU 24 and a RAM (memory means) 26 for performing various calculations and processes. have. In the RAM 26, the seam data for determining the amount of movement of the sewing needle 5 required for forming the unit shape 56A consisting of a predetermined number of needles on the sewing object 6 is stored in correspondence with each needle. The data calculated by the CPU 24 is stored. The CPU 24 is connected to the input / output interface 28.

At the input of the input / output interface 28, a pedal switch 30, a seam shape selection switch 10a of the operation panel 10, a lock stitch method selection switch 10b, a lock stitch number setting switch 10c, and a shape starting position The selection switch 10d and the needle sewing needle setting switch 10e are connected. The pedal switch 30 is a stepped type, which outputs the start signal of the shape sewing by stepping forward and the end signal of the shape sewing by stepping back.

The sewing machine motor 32 for rotating the main shaft 2 of the sewing machine and the stepping motor 12 for moving the needle bar 3 are output through the motor drivers 33 and 34, respectively. Connected to the negative.

FIG. 4A is a diagram for explaining seam data of a scallop-shaped unit shape 56A formed of 24 needles, and FIG. 4B is a unit shape 56A stored in the RAM 26. In Fig. 4A, M0, M1, M2,... Indicates each needle drop point, and the subscript indicates the number of needles. O indicates the reference position of the sewing needle 5, and the distance Dx from this reference position to each needle drop point is stored in the RAM 26, corresponding to the number of needles, as the seam data. That is, D0, D1, D2,... Denotes the seam data, and the subscripts indicate the corresponding number of needles. Since the unit shape 56A is formed repeatedly on the sewing object, the seam data D24 of the 24th needle drop is the seam data D1 of the needle drop of the first needle.

In addition, in the shape start position selection switch 10d, for example, in the case of the scallop shape 56A, the `` mountain start '' which starts sewing from the position of the widest sewing width in the center of the scallop shape 56A, and the first most sewing width From this narrow position, you can choose to start sewing the valley. 4 shows the seam shape 56 and seam data in the case of "beginning valley", and in the case of "mountain start", seam shape is started with the needle drop point M12 of FIG.

Next, the control operation by the control apparatus 20 of this embodiment is demonstrated based on the flowchart of FIG. 5 and FIG. In addition, this flowchart only shows the control operation by the control apparatus 20, and operation by an operator is not shown. For example, the seam shape and the lock stitch method are selected by the operator operating the switch group of the operation panel 10 before the operation by this flowchart, and the number of lock stitch needles and the shape start position are set.

S1, S2,... Indicates the number of processing steps (steps). First, in S1, it is determined whether there is a sewing start request by stepping on the pedal switch 30, and if requested, the flow advances to S2 to determine whether the lock stitch at the start of sewing is selected. If it is selected, the lock stitch solenoid 41 is driven in S2a, and is converted to the feed pitch set in the feed pitch adjustment dial 40 for lock stitch. Next, lock stitch data is created in S3. The method of creating the lock stitch data is a needle set in the lock stitch needle number setting switch 10c by setting the seam data D0 of the zero needle and the seam data D1 of the first needle as shown in FIG. It is repeated as many times as the lock stitch data. 7 shows an example in which the number of lock stitches in the lock stitch is set to five. In addition, since the number of needles (Mx) constituting the unit shape (56A) is shown as the number of needles for the shape, the needle set by the needle needle number setting switch 10e is set to 1 needle after 24 needles. Since the number is the cumulative number of the needles in each unit shape 56A, the next to the 24 needles are calculated as 25 needles.

After creating the lock stitch data in S3, the flow advances to S4 to perform the sewing operation. That is, based on the created lock stitch data, the stepping motor 12 is driven by a predetermined step, and the needle vibrator 100 moves the sewing needle 5 in a direction orthogonal to the conveying direction, and moves the sewing needle 5 to the shanghaidong. do. Furthermore, the to-be-sealed material 6 is conveyed by the feed tooth 4 by 1 needle of a conveyance direction by the feed pitch set by the feed pitch adjustment dial 40 for lock stitches. In S5, it is determined whether the number of lock stitch needles set by the lock stitch needle number setting switch 10c has been reached, and if not, repeats S4 to execute the lock stitches 58 of the set needle number as shown in FIG.

When the number of lock stitch needles reaches the set needle number in S5, the flow advances to S5a. In S5a, energization of the lactitch solenoid 41 is stopped, and it is converted into the normal feed pitch set by the feed pitch adjustment dial 9. If the lacquer at the start of sewing is not selected at the end of S5a and S2, the flow advances to S6 to read the seam data for shape sewing from the RAM 26. FIG. Subsequently, the process proceeds to S7 and the stepping motor 12 is driven by a predetermined step by the seam data read in S6, and the needle vibrator 100 moves the sewing needle 5 in the direction orthogonal to the conveying direction, and the sewing needle ( 5) is moved to and from the transfer tooth 4, the to-be-sealed material 6 is conveyed by 1 needle in a conveyance direction. In step S8, it is determined whether or not there is a sewing end request by the stepping of the pedal switch 30 or whether the number of the sewing needles set in the sewing needle number setting switch 10e is reached. If the number of needles is not reached, the required shape sewing is performed by repeating S7.

After the shape sewing is finished, the process proceeds to S9 and judges whether the lactitch of the sewing end is selected, and if so, the lactitch solenoid 41 is driven in S9a, and the feed set by the lactitch feed pitch adjustment dial 40 is selected. Converted to pitch. Next, the lock stitch data is created in S10. The method of creating the lactitch data is as shown in Fig. 8, at the end of the seam sewing, the seam data D15 of the final needle (M15 in the illustrated example) and the seam of the next needle dropping point M16. The data D16 is repeated alternately by the number of needles set in the lock stitch needle number setting switch 10c to be lock stitch data. 8, the example which set the lock stitch number of the needle to four is shown.

Subsequently, the procedure proceeds to S11 where one needle sewing operation is performed. In S12, it is judged whether the number of lock stitch needles set by the lock stitch needle number setting switch 10c has been reached, and if not, repeats S11 to perform the lock stitch 60 of the set number of needles as shown in FIG. When the lock stitch of the set number of needles is finished, the flow advances to S12a. In S12a, energization of the lock stitch solenoid 41 is stopped, and it is converted into the normal feed pitch set by the feed pitch adjustment dial 9. Subsequently, the procedure proceeds to S13 where thread cutting is performed to complete the sewing operation.

7 and 8 are examples of the shape start position selection switch 10d, which shows an example in which "start of valley" is selected, but an example of a lock stitch 58 of sewing start when "mountain start" is selected. Is shown in FIG.

As mentioned above, although the sewing machine which concerns on this invention was demonstrated based on embodiment shown in drawing, this invention is not limited to this embodiment, A various change practice is possible.

For example, in the above embodiment, as shown in Fig. 4A, the movement amount of the sewing needle is determined by the distance Dx (seam data) from the reference position O (base line) of the sewing needle 5 to each needle drop point. As a result, the needle vibration position was changed. Instead, seam data is provided as position data (absolute position) from the reference position O, and it is also easy to think of creating a scallop shape by changing the needle vibration position.

For example, in the case of the sewing start lock stitch, an example in which seam data D0 of the seam shape 56 and seam data D1 of the first needle are alternately created is shown. Instead of one seam data D1, the seam data D2 of the second needle or the third seam data D3 can be used. Similarly, in the case of the lock stitch at the end of sewing, the seam data D15 of the final needle M15 of the seam shape 56 at the end of the sewing is alternately repeated with the seam data D16 of the next needle drop point M16. Although the example of making lacstitch data is shown, instead of the seam data D16 of the next needle drop point M16, the seam data D14 of the needle drop point M14 in front of the needle, or the front of the needle drop point M14 is shown. The seam data D13 of the needle dropping point M13 can be used.

The lock stitch data can also be created such that the stitch width obtained by multiplying the stitch width drawn from the two seam data by a predetermined coefficient is obtained. It is preferable that the coefficient in this case can be set to an arbitrary value (for example, 0.1 to 1.0) by the operation panel 10. At this time, the lock stitch at the start of sewing is based on the drop needle point of the left needle, and the lock stitch at the end of sewing is formed on the basis of the final needle drop position.

According to the present invention, the lock stitch data is created based only on two pieces of seam-shaped seam data at a position closer to the position at which the lock stitch of the sewing object is performed by the lock stitch data generating device and seam data in the vicinity thereof. And a lock stitch control means for forming a lock stitch on the object to be stitched by changing the needle vibration position by the needle vibrator every needle based on the lock stitch data over the set number of lock stitch needles. Since the conveyance pitch of the to-be-sealed object is made smaller than the predetermined conveyance pitch, seam-shaped lock stitch data in which the stitching width is continuously changed can be easily created, and the lock stitch can be improved in appearance.

Claims (4)

Shanghai sewing needle, A cloth feed device for conveying the to-be-sealed material at a predetermined feed pitch in the conveying direction for each needle; A transfer pitch changing device capable of changing the transfer pitch; A needle vibration device capable of moving the sewing needle to any needle vibration position in a direction orthogonal to the conveying direction; Seam shape selection means for selecting a unit shape formed by a predetermined number of needles; Storage means for storing seam data for determining the needle vibration position for forming the unit shape on the object to be stitched in correspondence with each needle number; Lock stitch needle number setting means for setting the number of needles of the lock stitch, Shape sewing control means for repeating the selected unit shape on the sewing object by changing the needle vibration position by the needle vibration device for each needle based on the seam data; Lock stitch data creating means for creating lock stitch data by two pieces of seam data of the seam at the position closest to the position where the lock stitch on the sewing object is performed and seam data in the vicinity thereof; Lock stitch control means for forming a lock stitch on the object to be stitched by changing the needle vibration position by the needle vibrator for each needle based on the lock stitch data over the number of needles set by the lock stitch needle number setting means; Equipped, And a conveying pitch of the object to be sealed is smaller than the predetermined conveying pitch at the time of the lock stitch by the conveying pitch changing device. The method of claim 1, A sewing machine, characterized in that the lock stitch data of the lock stitch at the end of sewing is created by alternately repeating the seam-shaped final needle and seam data in the vicinity thereof. The method of claim 1, And the lock stitch data of the lock stitch at the start of sewing is alternately created between the seam data in the seam-shaped zero needle and the seam data in the vicinity thereof. The method of claim 1, Lock so that the sewing width obtained by multiplying the stitch width drawn from the two seams of the seam-shaped seam data at the position closest to the position at which the lock stitch on the sewing object is performed and the seam data in the vicinity thereof is a predetermined coefficient. A sewing machine characterized by creating stitch data.