JP2001212386A - Sewing machine with needle rocking function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine capable of individually setting the needle fluctuation quantity for the needle feed or needle fluctuation for each sewing mode during sewing, capable of easily setting the needle fluctuation quantity, beautifully finishing check stitches, and capable of easily setting the implementation or non-implementation of the needle fluctuation or needle feed. SOLUTION: The generation control of sewing programs is implemented, a sewing program number is selected (S10), and the check stitch length at a sewing start end is set (S13). The pitch quantity of needle fluctuation for the check stitches at the start end is set (S14), the needle fluctuation quantity for lock stitches is set (S16), and the fabric feed quantity for the lock stitches is set (S17). The presence or absence of needle fluctuation for the check stitches at the start end is set (S18), and the check stitch length at the sewing finish end is set (S19). The pitch quantity of needle fluctuation for the check stitches at the start end is set (S20), and the presence or absence of needle fluctuation for the check stitches at the finish end is set (S21). When the set value input is finished, these set values are stored in a set value memory (S22).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine having a needle swing function, and in particular, stores a needle swing amount set for each sewing mode in data storage means, and reads out the needle swing amount at the time of sewing to read the needle swing amount. The present invention relates to a device in which swing (needle feed) is drive-controlled by an electric actuator.

[0002]

2. Description of the Related Art Conventionally, in a ball-stitch sewing machine, a folded-up ball-stitched cloth is placed on a body cloth, and the cloth is fed by a cloth while being pressed and held by a large presser plate.
The needle is used to perform the ball stitching. In this case, depending on the types of these cloths, the feed amount of the upper ball-stitched cloth is smaller than the feed amount of the lower body cloth, and there is a problem that a cloth shift easily occurs.

Therefore, in a general lockstitch sewing machine, in order to prevent the upper and lower fabrics from being displaced by a cloth, the needle swings in a state where the sewing needles are stabbed in these cloths and the needles are fed in synchronization with the cloth feed. Some are provided with a mechanism.
As the needle swing mechanism, there is a mechanical drive type which is mechanically connected to a cloth feed mechanism for feeding the cloth, and feeds a predetermined amount of needle while piercing the cloth at the time of cloth feed. Has been adopted.

[0004]

When cloth is fed by the above-described mechanically driven needle feed mechanism, it is necessary to completely match the cloth feed amount by the cloth feed mechanism with the needle feed amount by the needle swing mechanism. When the cloth feed amount and the needle feed amount are misaligned, the work cloth is damaged, resulting in poor sewing finish.

An object of the present invention is to make it possible to individually set a needle swing amount for needle feed or needle swing for each sewing mode in the middle of sewing, to be able to easily set the needle swing amount, and to carry out stop sewing. Fine finishing, easy execution of needle swing or needle feed execution, etc. can be set.

[0006]

According to a first aspect of the present invention, there is provided a sewing machine having a needle swinging function, a needle bar having a sewing needle at a lower end and capable of moving up and down, and a cloth transferring means for transferring a work cloth in a predetermined cloth feeding direction. The sewing machine has a needle swing mechanism that swings the needle bar in a vertical plane parallel to the cloth transfer direction, a needle swing actuator that drives the needle swing mechanism, and a plurality of sewing modes. An input setting means for inputting and setting a needle swing amount and storing and holding the data in a data storage means; a needle swing control means for reading a needle swing amount from the input setting means and controlling a needle swing actuator based on the needle swing amount; It is provided with.

[0007] The input setting means stores the needle swing amount input and set corresponding to each of the plurality of sewing forms in the data storage means. The needle swing control means reads the needle swing amount from the input setting means and controls the needle swing actuator based on the needle swing amount. As a result, since the needle swinging mechanism is driven by the needle swinging actuator, the needle bar swings in a vertical plane parallel to the cloth transfer direction at a predetermined feed timing. Therefore, depending on the sewing mode, a so-called needle feed, which swings while the sewing needle is stuck in the work cloth, is executed,
A needle swing is performed in which the needle swings while the sewing needle is not stuck in the work cloth, and these needle swing amounts can be appropriately changed based on the set value.

Here, the plurality of sewing forms include a stop stitch formed on at least one of a sewing start end and a sewing end end. In the case of the stop stitch, the cloth transfer by the cloth transfer means is stopped. When the needle bar is swung while the sewing needle is coming out of the work cloth (claim 2 dependent on claim 1), only the swing of the sewing needle is performed while the sewing needle is swung during the rising period. Since the stop sewing is performed in the above, when a plurality of work cloths are stopped and sewn, there is no occurrence of a cloth shift, and a good finished appearance can be achieved.

Further, the plurality of sewing forms include a lockstitch, and in the case of the lockstitch, the needle is fed by a sewing needle substantially in synchronization with the cloth transfer by the cloth transfer means. According to the third aspect, the needle feed can be executed during the main sewing where the cloth feed amount is large, and a good sewing finish style can be achieved without causing a cloth displacement when performing the main sewing of a plurality of work cloths.

Further, the cloth transfer means is configured to be capable of transferring the cloth in a state where the body cloth and the ball-stitched cloth are clamped, and the sewing machine is a ball stitch sewing machine for sewing a ball-stitched cloth to the body cloth with two needles. In the case (claim 4 depending on any one of claims 1 to 3), when the body cloth and the ball-stitching cloth are ball-stitched in a clamped state using a ball-stitching sewing machine, the body cloth and the ball-stitching are used. There is no gap between the cloth and the cloth, and the bead stitching can be performed in a good finished appearance.

Further, the cloth transfer means is configured to be capable of transferring the work cloth in a cloth feed direction by a feed dog.
According to claim 5), even in a normal lockstitch sewing machine or the like in which a work cloth is fed by a feed dog, a cloth shift can be reliably prevented by feeding the needle at the time of sewing.

The needle swinging mechanism includes a needle bar swinging shaft that is arranged in parallel with the main shaft of the sewing machine and swings a needle bar base that supports the needle bar, and a needle at one end of the needle bar swinging shaft. A swing lever fixed to the rod swing shaft at right angles, and an eccentric cam that is in contact with a driven surface of a swing end of the swing lever and that is rotationally driven by a needle swing actuator. In this case (claim 6 dependent on any one of claims 1 to 5), the eccentric cam is rotationally driven by the needle swing actuator, and the rotation of the eccentric cam causes the swing end portion to come into contact with the eccentric cam. The swing lever swings through the swing of the needle bar, and the needle bar swing shaft fixed to the swing lever orthogonally swings, and finally the needle bar swings due to the swing of the needle bar base. .

In this case, since the needle bar swing shaft is directly swung via the swing lever by the rotation of the eccentric cam, the needle bar swing mechanism can have a simple structure, and the sewing machine can be downsized. Needle swing actuator may be used for low speed drive,
The size can be reduced and the cost can be reduced.

According to a seventh aspect of the present invention, there is provided a sewing machine having a needle swing function.
In a sewing machine having a needle bar having a sewing needle at a lower end and capable of moving up and down, and a cloth transfer means for transferring a work cloth in a predetermined cloth feed direction, the needle bar is swung in a vertical plane parallel to the cloth transfer direction. A needle swinging mechanism, a needle swinging actuator that drives the needle swinging mechanism, and a state in which the cloth transfer by the cloth transfer means is stopped at the time of stop sewing formed on at least one of the sewing start end and the sewing end end. And control means for controlling a needle swing actuator so as to swing the needle bar while the sewing needle is coming out of the work cloth.

At the time of stopping and sewing at least one of the sewing start end and the sewing end end, the control means sets the stop sewing data set in advance to the sewing data to be sewn while the cloth transfer by the cloth transfer means is stopped. The needle swing actuator is controlled so as to swing the needle bar while the sewing needle is coming out of the work cloth based on the pitch and the like. As a result, since the needle swinging mechanism is driven by the needle swinging actuator, the needle bar swings in a vertical plane parallel to the cloth transfer direction at a predetermined feed timing. Therefore, since the stop sewing is executed only by swinging the sewing needle, when a plurality of work cloths are stopped and sewn, there is no displacement of the cloth, and a good finished appearance can be achieved.

A sewing machine having a needle swing function according to claim 8 is
In a sewing machine having a needle bar having a sewing needle at a lower end and capable of moving up and down, and a cloth transfer means for transferring a work cloth in a predetermined cloth feed direction, the needle bar is swung in a vertical plane parallel to the cloth transfer direction. A needle swinging mechanism, a needle swinging actuator that drives the needle swinging mechanism, a sewing mode in which the work cloth is moved by the cloth transfer means on the needle, and a sewing needle that swings below the needle and is synchronized with the swinging. One of at least two of a sewing mode in which the workpiece transfer is performed by the cloth transport unit and a sewing mode in which the workpiece transfer is stopped by the cloth transport unit and the sewing needle is swung on the needle. And a control means for controlling the cloth transfer means and the needle swinging actuator based on the sewing mode selected by the selection means.

A sewing mode in which the selecting means shifts the work cloth on the needle by the cloth transfer means, and a sewing mode in which the sewing needle is swung under the needle and the work cloth is shifted by the cloth transferring means in synchronization with the swing. And one of at least two of the sewing forms in which the movement of the work cloth by the cloth transfer means is stopped and the sewing needle is swung on the needle is selected, and the selected sewing form is selected by the control means. The cloth transfer means and the needle swing actuator are controlled on the basis of. Therefore, a favorable sewing finish can be achieved by a feed operation optimal for the sewing mode.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example in which the present invention is applied to a ball stitch sewing machine having a needle swing function. As shown in FIG. 1, the bead sewing machine 1 includes a sewing machine main body 2, a sewing machine table 3, a clamp device 4, a cloth transfer mechanism 5, a needle swing mechanism 6, and the like. The sewing machine main body 2 is mounted on a sewing machine table 3 and has a bed 10 having a thread catcher (not shown), a pillar 11 erected from the right end of the bed 10, Arm 12 extending from upper end to face bed 10
It is composed of

As shown in FIG. 1 and FIG.
Is movably arranged on the sewing machine table 3 between a preparation position indicated by a two-dot chain line in front of the sewing needle 29 and a sewing position near the sewing needle 29. As is well known, the clamp device 4 is configured to attach the body cloth W1 to the sewing machine table 3.
A pair of large holding plates 15 that can be moved up and down to hold them on the top
And a pair of folding plates 16 that can be opened and closed in the horizontal direction to bend the ball-stitched cloth W2 placed on the body cloth W1 from the left and right sides and hold the cloth on the body cloth W1; The flap cloth W3 placed on the sewing cloth W2 is
6 is provided with a pair of flap holders 17 which can be moved up and down for pressing and holding them.

The binder 18 has a substantially inverted T-shaped cross section.
It extends from the preparation position of the clamp device 4 to the sewing position, and is disposed above the sewing machine table 3 so as to be able to move up and down. After the ball-stitched cloth W2 is placed on the body cloth W1, the binder 18 descends on the ball-stitched cloth W2 prior to the folding operation of the folding plate 16, and presses the ball-stitched cloth W2 onto the body cloth W1. Hold.

Next, the sewing machine main body 2 will be described with reference to FIGS. A large liquid crystal display 20 and an operation panel 21 are provided on the front surface of the pillar 11, and various setting values for executing a sewing program described later are operated through an input screen displayed on the display 20. Input can be set from ten keys provided on the panel 21. A sewing machine main shaft 22 arranged in the left and right direction inside the arm portion 12 is rotatably supported by a sewing machine frame F, and is rotated by a sewing machine motor 23. A needle bar crank 24 is fixed to the left end of the sewing machine main shaft 22, and a needle bar 27 is supported by a needle bar base 28 on the left side of the needle bar crank 24 so as to be vertically movable.

The other end of the crank rod 25, one end of which is connected to the needle bar crank 24, is connected to a needle bar holder 26 fixed to a needle bar 27. The needle bar 27 is reciprocated up and down via the main shaft 22, the needle bar crank 24 and the crank rod 25. Here, two sewing needles 29 are attached to the lower end of the needle bar 27. When the clamp device 4 is moved to the preparation position in FIG. 1, the large presser plate 15, the folding plate 16, the flap presser 17 and the binder 18 cooperate with each other.
As shown in FIG. 7, the body cloth W1, the ball-stitched cloth W2 and, if necessary, the flap cloth W3 are pressed and held on the sewing machine table 3.

Sewing is started in this holding state, and the cloths W1 to W3 are moved in the cloth feeding direction D from the preparation position to the sewing position as the clamping device 4 is moved backward by the cloth transfer mechanism (see FIG. 5). The cloth W1 to W3 is sequentially transferred to the cloths W1 to W3 by stop sewing, final sewing, stop sewing at the sewing end end, and the like in cooperation with the sewing needle 29 and the thread catcher. Next, the needle swing mechanism 6 that swings the sewing needle 29 (needle bar 27) in the vertical plane will be described with reference to FIGS.

A swing support portion 28a integrally formed at the right end of the needle bar base 28 has a left end of a needle bar swing shaft 30 disposed below the sewing machine spindle 22 and parallel to the sewing machine spindle 22. The upper end of a vertically-moving (orthogonal to the needle bar swing shaft 30) swing lever 31 is fixed to the right end of the needle bar swing shaft 30. A substantially rectangular frame-shaped driven frame portion 31a is formed at a lower end portion of the swing lever 31. A needle swinging stepping motor 32 is provided at the lower end of the pillar 11.
A drive shaft 32a of this stepping motor 32 is disposed in parallel with the main shaft 22 of the sewing machine, and is pivotally supported by the sewing machine frame F so as to be rotatable.

An eccentric cam 33, which is in contact with a driven surface 31b on the inner surface of the driven frame portion 31a, is fixed to a substantially middle portion of the drive shaft 32a in the left-right direction. In FIG. 4, when the needle swinging stepping motor 32 rotates by a predetermined angle in the counterclockwise direction, the eccentric cam 33 simultaneously rotates and moves forward, and the forward movement causes the driven frame portion 31a to move forward. Move forward a predetermined distance. Accordingly, the needle bar swing shaft 30 rotates counterclockwise, the needle bar 27 swings counterclockwise via the needle bar base 28, and the lower end of the sewing needle 29 moves forward by a predetermined distance. I do.

When the needle swinging stepping motor 32 rotates clockwise by a predetermined angle, the eccentric cam 33 rotates.
Then, the swinging lever 31, the needle bar swinging shaft 30, and the needle bar base 28 rotate in the opposite directions as described above, and the lower end of the sewing needle 29 moves backward by a predetermined distance. In FIG. 4, the position of the sewing needle 29 indicated by a solid line is defined as a reference position 29 (K), and the position of the sewing needle 29 indicated by a two-dot chain line moved forward of the reference position 29 (K) is defined as a forward movement position 29. (F), and the position of the sewing needle 29 indicated by a two-dot chain line moved backward from the reference position 29 (K) is defined as a backward movement position 29 (B).

The forward movement position 29 (F) is the reference position 2
The rearward movement position 29 (B) can be moved up to about 4 mm backward with respect to the reference position 29 (K). When the needle feed amount is “0”, the sewing needle 29 is moved to the reference position 29.
(K) moves up and down. Next, a control system of the bead sewing machine 1 will be described. As shown in FIG. 5, the control device 40 includes an input interface 41, a CPU 42, a ROM 4
3 and a RAM 44, a microcomputer including an output interface 45, drive circuits 46 to 49, a display controller 50, and a common bus 51 such as a data bus connecting these.

The input interface 41 has a folding start switch 52 for instructing the folding operation and the clamping operation of the clamping device 4, a folding release switch 53 for instructing the release of the folding operation, and instructing start and stop of the automatic ball stitch sewing. The start / stop switch 54, the operation panel 21, and the timing signal generation for detecting a plurality of rotation phases of the sewing machine spindle 22 by reading a large number of radial thin lines drawn on the disc 13 fixed to the sewing machine spindle 22. Device 55 and the like are connected.

The sewing machine motor 23 is connected to the drive circuit 56, and the needle swinging stepping motor 3 is connected to the drive circuit 47.
The driving circuit 48 is connected to a plurality of air cylinder groups 56 provided in the clamp device 4.
A cloth transfer motor 57 for transferring the cloth transfer mechanism 5 (corresponding to the cloth transfer means) in the cloth feed direction D is connected to 9. The ROM 43 stores these motors 23, 32, 57
And a plurality of drive control programs for controlling the air cylinder group 56, a control program for creating a sewing program unique to the present invention, a sewing control program including a needle feed control, and the like, which are described later.

Program number memory 44a of RAM 44
Stores the selected sewing program number. In the set value memory 44b, set values set for each sewing program are stored in association with the sewing mode. The sewing data memory 44c stores sewing data for bead sewing. Further, the RAM 44 is provided with various other necessary memories. Next, a routine of the sewing program creation control executed by the control device 40 will be described based on the flowchart of FIG. However, the symbol Si in the figure
(I = 10, 11, 12,...) Are each step.

When the power is turned on, a menu screen including a plurality of items is displayed on the liquid crystal display 20. When the operation panel 21 is operated and the item "Create sewing program" is selected from the menu screen, this control is started.
When this control is started, first, a selection process for selecting a sewing program number is executed (S10). For example, "N
o. Select "1". Next, a setting screen for setting a set value for each sewing mode is displayed on the liquid crystal display 20 (S11). First, the sewing length of the entire bead sewing is set (S11).
12). For example, “150 mm” is set.

Next, the length of the stop sewing at the sewing start end is set (S13). For example, “2 mm” is set. Next, a pitch amount of the needle swing at the start end of the stitch sewing is set (S14). For example, “0.5 mm” is set. Next, the needle feed state of the lockstitch is set (S15). For example, "ON" is set to execute the needle feed.

Next, when executing the needle feed of the lockstitch, the needle swing amount is set (S16). For example, “1 mm” is set. Next, the cloth feed amount by the cloth transfer motor 57 in the main sewing is set (S17). For example, “2 mm” is set. Next, the needle swing state at the time of performing the start stitch sewing is set (S18). For example, "ON" is set to execute the needle swing. Next, the length of the stop sewing at the sewing end is set (S19). For example, “2 mm” is set. Next, the pitch amount of the needle swing at the end sewing of the end stitch is set (S20). For example, “0.5 mm” is set.
Next, the needle swing state at the time of performing the stop sewing at the end end is set (S21). For example, since the needle swing is not executed, "OF
F "is set.

Next, the plurality of set values thus set are:
The set value memory 44b is stored in the set value memory 44b so as to correspond to each of the sewing forms such as the start sewing, the main sewing, the end sewing, and the like (S22). The sewing data memory 44c created by calculation
(S23), terminates this control, and returns to the main routine. For example, when the set values described above are set, the set values are stored and held in the set value memory 44b in correspondence with the sewing mode, as shown in FIG.

Next, from the menu, select the item "Ball stitch sewing".
The routine of the automatic bead sewing control executed when is selected will be described with reference to the flowchart of FIG. When this control is started, first, a sewing program number selection screen is displayed on the liquid crystal display 20, and a desired sewing program number is selected (S30). Next, when the folding start switch 52 is operated (S31: Yes), the large holding plate 15, the folding plate 16, the flap holding member 17, the binder 18 and the like are driven, and the body cloth W
A folding process of pressing and holding the sewing machine 1 and the ball stitching cloth W2 and, if necessary, the flap cloth W3 on the sewing machine table 3 is executed (S32).

Next, when the start / stop switch 54 is operated (S33), the clamp device 4 is moved from the preparation position to the sewing start position (S34). At this time, the needle swinging stepping motor 32 is driven counterclockwise by a predetermined angle based on the stop stitch length (2 mm) at the sewing start end, and the sewing needle 29 moves to “+2 mm”, that is, its reference position 29 ( K) 2 mm frontward forward movement position 29 from K)
It moves to (F) (S35). Then the sewing machine motor 23
Is driven (S36). 1 at the position of +2 mm
After the sewing for the stitches, based on the signal from the timing signal generator 55, at a predetermined cloth feed timing while the sewing needle 29 is coming out of the work cloth (S37: Yes), the stop stitching processing of the start end is performed. It is executed (S38).

In the stop sewing in this case, since the needle swings, the sewing needle 29 (the needle bar 2) is held while the large presser plate 15 is stopped.
7) is moved by "-0.5 mm", that is, in the cloth feeding direction D.
The needle is swung backward by a pitch amount of 0.5 mm. Next, based on the stop stitch length at the sewing start end and the amount of needle swing in the stop stitch, if the stop sewing at the sewing start end is not completed (S39: No), S37 to S39 are repeatedly executed, and the stop sewing is performed. Is completed (S39: Yes), lockstitching processing is executed (S40). In this case, the stop stitch length at the sewing start end is “2 mm” and the needle feed amount for one stitch in the stop stitch is “0.5 mm”, so the stop stitch at the sewing start end extends over four stitches. Be executed.

By the way, in the lockstitching process, the sewing length “150 mm”, the stop stitching length “2 mm, 2 mm” at the sewing end and the sewing start end, the needle feed amount “1 mm” at the time of the lockstitching, The number of stitches is obtained based on the cloth feed amount “2 mm” at the time of lock stitching, and lock sewing is performed for the predetermined number of stitches. That is, at every predetermined cloth feed timing while the sewing needle 29 is piercing the work cloth, the large presser plate 15
In synchronization with the transfer, the needle 29 is fed by 1 mm while the sewing needle 29 is stuck in the body cloth W1 and the ball-stitched cloth W2.

The needle feed amount is 1 m for the cloth feed amount of 2 mm.
The reason for this is that in this sewing machine, the sewing speed is so fast that the sewing needle 29 comes out of the work cloth before the cloth feeding of 2 mm is completed. The optimum value is set empirically based on the cloth feeding start timing and the like. In the lock stitching process, if the lock stitch needle feed is set to “OFF”, the work cloth is transferred by the cloth transfer mechanism 5 at a predetermined cloth feed timing while the sewing needle 29 is coming out of the work cloth. . Of course, in this case, the sewing needle 29 does not swing.

Therefore, the sewing mode in this embodiment is such that the work cloth is moved by the cloth transfer mechanism 5 on the needle, the sewing needle 29 is swung under the needle, and the cloth transfer mechanism is synchronized with the swing. 5, the work cloth is moved by the cloth transfer mechanism 5,
Three types are provided in which the sewing needle 29 is swung on the needle, and can be switched according to the setting states of S14, S18, and S21. After the end of the lockstitching process, at a predetermined feed timing while the sewing needle 29 is coming out of the work cloth (S41: Yes), a stop stitching process at the start end is executed (S42).

In this case, since the needle swing in the stop sewing is not executed, the large presser plate 15 is moved in the cloth feeding direction D at a pitch of 0.5 mm while the needle swing is stopped. next,
On the basis of the stop stitch length at the sewing end end and the needle feed amount for one stitch in the stop stitch, when the stop stitch at the sewing end end is not completed (S43: No), S41 to S43 are repeatedly executed, and the stop is performed. When the sewing is completed (S43: Yes
Then, the drive of the sewing machine motor 23 is stopped (S44), and a cutting process is performed to align both ends of the body cloth W1 and the ball-stitched cloth W2, which are not shown, by operating a corner knife (S45) (S45). ), End this control and return to the main routine.

Here, the set value memory 44b corresponds to the data storage means, and the sewing program creation control except S23 and the input setting means are constituted by the set value memory 44b and the like. A needle bar swing control means is constituted by automatic sewing control and the like, and a selection means is constituted by sewing program creation control, especially S14, S18, S20 to S21, and the like.

As described above, the needle swinging mechanism 6 is driven by the needle swinging stepping motor 32, and the sewing program creation control controls the needle swing amount of the stop sewing at the sewing start end, the needle swing amount in the final sewing, and the sewing end end. The amount of swing of the needle for the lock stitch
Numerical values can be set from the operation panel 21 corresponding to each of the sewing forms. These set values are stored in the set value memory 44b.
Since the needle swing stepping motor 32 is controlled based on these set values at the time of sewing,
In particular, in the stop sewing, the needle bar 27 is swung while the sewing needle 29 is coming out of the body cloth W1 or the ball-stitching cloth W2 while the cloth transfer by the cloth transfer mechanism 5 is stopped.
Can be executed only by swinging the sewing needle 29 while swinging during the rising period, so that these body cloths W1
When the ball-stitched cloth W2 is stopped and sewn, no misalignment occurs and a good finished appearance can be achieved.

A sewing mode in which the workpiece transfer mechanism 5 moves the work cloth on the needle, and a sewing mode in which the sewing needle 29 is swung under the needle and the work cloth is moved by the cloth transfer mechanism 5 in synchronization with the swing. A desired one can be easily selected from the form and the sewing form in which the movement of the work cloth by the cloth transfer mechanism 5 is stopped and the sewing needle 29 is swung on the needle, and the set value is associated with the sewing form by a numerical value. Therefore, according to the sewing mode, it is possible to execute a so-called needle feed in which the sewing needle 29 swings while being stuck in the work cloth, and to execute the needle swing in which the sewing needle 29 swings while not stuck in the work cloth, In addition, the needle swing amount can be easily changed and set as appropriate based on the set value.

The needle swing mechanism 6 includes a needle bar swing shaft 30 that is arranged in parallel with the main shaft 22 of the sewing machine and swings a needle bar base 28 that supports the needle bar 27. Swinging lever 31 fixed to the right end of the needle at right angles to the needle bar swinging shaft 30
And the driven surface 31 of the driven frame portion 31a of the swing lever 31
b, and the eccentric cam 33 is rotated by the needle oscillating stepping motor 32, so that the rotation of the eccentric cam 33 causes the needle bar oscillating shaft 3 via the oscillating lever 31.
In this configuration, the needle bar swing mechanism 6 can have a simple structure, the size of the sewing machine main body 2 of the ball stitch sewing machine 1 can be reduced, and the needle swing stepping motor 32 can be rotated.
Can be used for low-speed driving, can be miniaturized, and can be advantageous in terms of cost.

A modification of the above embodiment will be described. 1) The ball stitch sewing may include a lock stitch and a stop stitch at one of a sewing start end and a sewing end end. 2) Instead of the needle swing stepping motor 32, various electric actuators such as a linear solenoid may be used. 3) The drive shaft of the needle swinging stepping motor 32 may be formed in an eccentric cam shape, and the eccentric cam 33 may be omitted.

4) The stop sewing may be of a type in which the sewing needle 29 is swung back and forth for each stitch. 5) The present invention is not limited to the above-described embodiment. In addition to the ball stitch sewing machine, a lockstitch sewing machine provided with a cloth transfer unit capable of transferring a work cloth with the feed dog in the cloth feeding direction. The present invention can be applied to various kinds of sewing machines.

[0048]

According to the first aspect of the present invention, the needle bar and the cloth transfer means are provided, and the needle swing mechanism, the needle swing actuator, the input setting means, and the needle swing control means are provided. According to the sewing mode, it is possible to execute a so-called needle feed in which the sewing needle oscillates while piercing the work cloth, and to execute a needle swing in which the sewing needle oscillates without piercing the work cloth. It can be changed appropriately based on the set value.

According to the second aspect of the present invention, the plurality of sewing forms include a stop sewing formed on at least one of a sewing start end and a sewing end end. Since the needle bar is swung while the sewing needle is coming out of the work cloth while the cloth transfer is stopped, stop sewing is performed only by swinging the sewing needle while the sewing needle is swung during the rising period. Therefore, when a plurality of work cloths are sewn together, there is no shift in the cloth, and a good finished appearance can be achieved. The other effects are the same as those of the first aspect.

According to the third aspect of the present invention, the plurality of sewing forms include lock stitches. In the lock stitch, the needle is fed by the sewing needle almost in synchronization with the cloth transfer by the cloth transfer means. Needle feed can be performed when the main sewing is performed with a large feed amount, and when performing the main sewing on a plurality of work cloths, a cloth shift does not occur, and a good finished appearance can be achieved. The other effects are the same as those of the first or second aspect.

According to the fourth aspect of the present invention, the cloth transfer means is configured to be able to transfer the cloth while clamping the body cloth and the ball-stitched cloth, and the sewing machine sewes the ball-stitched cloth to the body cloth with two needles. Since it is a ball-stitch sewing machine, when the body cloth and the ball-stitching cloth are ball-stitched in a clamped state using the ball-stitch sewing machine, the body cloth and the ball-stitching cloth do not shift with each other. Edge stitching can be performed in a good finished appearance. In addition, the same effect as any one of claims 1 to 3 can be obtained.

According to the fifth aspect of the present invention, the cloth transfer means is configured to be capable of transferring the work cloth in the cloth feed direction with the feed dog. Even with a sewing machine or the like, a cloth shift can be reliably prevented by feeding the needle during sewing. In addition, the same effect as any one of claims 1 to 3 can be obtained.

According to the sixth aspect of the present invention, the needle swinging mechanism includes a needle bar swinging shaft that is arranged in parallel with the main shaft of the sewing machine and swings a needle bar base that supports the needle bar. A swinging lever fixed to one end of the moving shaft at right angles to the needle bar swinging shaft, and an eccentric cam contacting a driven surface of the swinging end of the swinging lever, which is rotationally driven by a needle swinging actuator. Eccentric cam, the needle bar oscillating shaft is directly oscillated via the oscillating lever by the rotation of the eccentric cam. In addition to being small, the needle swing actuator can be driven at a low speed, and can be reduced in size and advantageous in cost. Other claims 1
5 has the same effect as that of any one of 5.

According to the seventh aspect of the present invention, the sewing machine includes the needle bar and the cloth transfer means, and includes the needle swing mechanism, the needle swing actuator, and the control means. In stopping sewing at least one of the needles, the needle swinging mechanism is driven by the needle swinging actuator, so that the stop sewing is executed only by swinging the sewing needle while the cloth transfer by the cloth transfer means is stopped. When the work cloth is stopped and sewn, there is no displacement of the cloth, and a good finished appearance can be achieved.

According to the eighth aspect of the present invention, the needle bar and the cloth transfer means are provided, and the needle swing mechanism, the needle swing actuator, the selection means, and the control means are provided. A sewing mode in which the work cloth is moved by the transfer means, a sewing mode in which the sewing needle is swung under the needle and the work cloth is moved by the cloth transfer means in synchronization with the swing, and a movement of the work cloth by the cloth transfer means is stopped. Thus, a desired one of the sewing modes in which the sewing needle is swung on the needle can be easily selected, and a favorable sewing finish can be achieved by an optimum feeding operation according to the selected sewing mode.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a ball stitch sewing machine according to an embodiment of the present invention.

FIG. 2 is a front view in vertical section taken along line BB of FIG. 1;

FIG. 3 is a longitudinal sectional view illustrating an internal mechanism of the sewing machine main body.

FIG. 4 is a vertical sectional side view taken along the line DD of FIG. 3;

FIG. 5 is a block diagram of a control system of the bead sewing machine.

FIG. 6 is a schematic flowchart of a routine of sewing program creation control.

FIG. 7 is a table illustrating a data configuration of a setting value memory.

FIG. 8 is a schematic flowchart of a routine of automatic bead stitching control.

[Explanation of symbols]

 Reference Signs List 1 ball sewing machine 4 clamp device 5 cloth transfer mechanism 6 needle swing mechanism 44b set value memory 22 sewing machine spindle 28 needle bar base 29 sewing needle 30 needle bar swing shaft 31 swing lever 32 needle swing stepping motor 33 eccentric cam W1 Body cloth W2 Ball sewing cloth

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Minoru Yamaguchi 15-1 Naeshiro-cho, Mizuho-ku, Nagoya City Inside (72) Inventor Koichi Akabane 15-1 Naeshiro-cho, Mizuho-ku, Nagoya City Brother Industries, Ltd. (72) Inventor Kazushi Inoue 15-1 Naeshiro-cho, Mizuho-ku, Nagoya-shi F-term (reference) 3B150 AA11 AA25 CB14 CC05 CE09 DB04 DE06 LA07 LA15 NA07 NA14 NB02 NB13 NC06 QA06 QA07

Claims (8)

[Claims] 1. A needle bar having a sewing needle at a lower end and capable of moving up and down,
A sewing machine provided with cloth transfer means for transferring a work cloth in a predetermined cloth feed direction; a needle swing mechanism for swinging the needle bar in a vertical plane parallel to the cloth transfer direction; and a needle swing mechanism. A needle swing actuator to be driven; input setting means for inputting and setting a needle swing amount corresponding to each of a plurality of sewing forms; and storing and holding the data in data storage means; A needle swing control means for controlling the needle swing actuator based on the amount of movement; and a sewing machine having a needle swing function. 2. The sewing method according to claim 1, wherein the plurality of sewing forms include a stop sewing formed on at least one of a sewing start end and a sewing end end. In the case of the stop sewing, the cloth transfer by the cloth transfer unit is stopped. 2. The sewing machine according to claim 1, wherein the needle bar is swung while the sewing needle is coming out of the work cloth. 3. The sewing method according to claim 1, wherein the plurality of sewing forms include lock stitches, and in the lock stitch, needle feed is performed by a sewing needle substantially in synchronization with cloth transfer by a cloth transfer unit.
Or a sewing machine having a needle swing function according to 2. 4. The cloth transfer means is configured to be capable of transferring cloth while clamping a body cloth and a ball-stitched cloth, and the sewing machine is a ball-stitch sewing machine that sewes a ball-stitched cloth to a body cloth with two needles. A sewing machine having a needle swing function according to any one of claims 1 to 3. 5. The needle swing function according to claim 1, wherein the cloth transfer means is configured to be capable of transferring the work cloth with a feed dog in a cloth feed direction. sewing machine. 6. The needle swinging mechanism includes a needle bar swinging shaft that is arranged in parallel with the main shaft of the sewing machine and swings a needle bar base that supports the needle bar, and a needle attached to one end of the needle bar swinging shaft. A swinging lever fixed perpendicularly to the rod swinging shaft, and an eccentric cam that is in contact with a driven surface of a swinging end of the swinging lever and that is rotationally driven by the needle swinging actuator. The sewing machine according to any one of claims 1 to 5, further comprising a needle swing function. 7. A needle bar having a sewing needle at a lower end and capable of moving up and down,
A sewing machine provided with cloth transfer means for transferring a work cloth in a predetermined cloth feed direction; a needle swing mechanism for swinging the needle bar in a vertical plane parallel to the cloth transfer direction; and a needle swing mechanism. A needle swinging actuator to be driven, and at the time of stop sewing formed on at least one of a sewing start end and a sewing end end, while the cloth transfer by the cloth transfer means is stopped, while the sewing needle is coming out of the work cloth. A sewing machine having a needle swing function, comprising: control means for controlling a needle swing actuator so as to swing a needle bar. 8. A needle bar having a sewing needle at a lower end and capable of moving up and down,
A sewing machine provided with cloth transfer means for transferring a work cloth in a predetermined cloth feed direction; a needle swing mechanism for swinging the needle bar in a vertical plane parallel to the cloth transfer direction; and a needle swing mechanism. A needle swinging actuator to be driven; a sewing mode in which the work cloth is moved by the cloth transfer means on the needle; and a sewing needle being swung under the needle, and the work cloth being moved by the cloth transfer means in synchronization with the swing. Selecting means for selecting one form from at least two of the sewing forms and the sewing form in which the movement of the work cloth by the cloth transfer means is stopped and the sewing needle is swung on the needle; and the selecting means, A sewing machine having a needle swing function, comprising: control means for controlling a cloth transfer means and a needle swing actuator based on a selected sewing mode.