KR20140106432A - Double needle sewing machine - Google Patents

Abstract

The present invention relates to a double-needle sewing machine that is capable of detecting various abnormalities by detecting movements of threads put through needle bars in and out of operation. According to the double-needle sewing machine (100) of the present invention, one of the two needle bars (110, 120) is driven through control or setting and sewing is performed by sewing needles (11, 12) provided in the selected needle bar. The double-needle sewing machine has two thread cutting sensors (161, 162) that detect movements of upper thread (U1, U2) which are respectively supplied to the sewing needle (11) of the selected and driven one needle bar (110) and the sewing needle (12) of the stationary and non-driven other needle bar (120). A control device (90 (CPU (91)) for the sewing machine is capable of determining an operation situation of the double-needle sewing machine based on a combination of the driving states of the two needle bars (110, 120) and the movements of the respective upper threads (U1, U2) detected by the two sensors (161, 162).

Description

{DOUBLE NEEDLE SEWING MACHINE}

The present invention relates to a twin needle sewing machine.

BACKGROUND ART [0002] A twin-needle sewing machine has been known in the past in which two needle bars provided at the lower end of a sewing needle are switched to operate one needle bar for sewing, thereby performing desired sewing.

In such a sewing machine, two kinds of yarns (for example, yarns of different colors or yarns of different thickness) having different characteristics are stitched on a sewing needle provided for each needle bar, and one of the needle bars is selected and the needle bar is operated Sewing is performed.

The yarn inserted into the sewing needles of each needle bar in such a sewing machine is supplied from a thread winder through each yarn path, and a yarn detecting sensor for detecting the movement of yarn is installed in each yarn path . When the yarn detecting sensor detects that yarn is not moved during sewing and yarn supply is not performed and an occurrence of abnormality such as yarn cutting or yarn breakage is detected, the control device of the sewing machine The operation is stopped to prevent occurrence of sewing failure.

Japanese Patent Application Laid-Open No. 2010-12271

However, in the case of the above-described conventional art, by detecting the movement of the yarn stuck to the sewing needles of one selected needle bar (one of them) by the yarn detecting sensor, occurrence of abnormality such as yarn cutting or yarn breakage on the sewing needle side of the operating needle bar There is a number. However, since there is a premise that sewing thread is not provided on the sewing needle of the needle bar of the other needle bar while the sewing machine is stopped and the sewing needle is not moved, movement of the sewing needle is detected and is not used for control of the sewing machine .

As a result, the sewing needle of the other needle bar during the stop of operation stuck to the needle bar or the thread in operation, and sewing defects occurred. In addition, two sewing threads were erroneously inserted, and the sewing failed to perform sewing in a different thread than the intended thread.

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique for detecting movement of a thread stuck to a needle bar during operation and during operation stop to enable various types of detection. More specifically, the present invention provides a technique for detecting that a thread stitched on a stitching needle in a stop state is stitched, or detecting an error in which a thread is reversely stitched.

According to the first aspect of the present invention,

A twin-needle sewing machine for performing sewing by a sewing needle provided in a selected needle bar, the needle bar being driven by either one of the two needle bars by operation or setting,

A first thread cutting sensor for detecting the movement of the upper thread supplied to the sewing needles of one needle bar, a second thread cutting sensor for detecting the movement of the upper thread supplied to the sewing needles of the other needle bar,

Control means for determining an operation state of the twin needle sewing machine based on a combination of a driving state of the two needle bars and a movement of an upper thread detected by the first thread cutting sensor and the second thread cutting sensor,

A storage means for storing a plurality of sewing abnormality patterns based on a driving state of the two needle bars and a combination of movements of respective upper chambers that can be detected by the first thread cutting sensor and the second thread cutting sensor, And,

The control means judges that the operation state of the twin needle sewing machine is equal to or greater than the sewing state when the operation state of the twin needle sewing machine matches one of the sewing abnormality patterns stored in the storage means.

According to the second aspect of the present invention, in the twin needle sewing machine,

And setting means for selecting and setting a sewing abnormality pattern to be used for judging the operation state of the twin needle sewing machine among the plurality of sewing abnormality patterns stored in the storage means,

The control means judges that the operation state of the twin needle sewing machine is sewing or more when the operation state of the twin needle sewing machine matches the sewing abnormality pattern set by the setting means.

According to the third aspect of the present invention, in the twin needle sewing machine,

And the control means stops the twin needle sewing machine when it is determined that the operation state of the twin needle sewing machine is sewing or more.

According to a fourth aspect of the present invention, in the twin needle sewing machine,

The sewing abnormality judged by the control means includes at least one of an upper thread stitched on a stitching needle in an operation stop state and an error in which the thread is stitched reversely.

According to the fifth aspect of the present invention, in the twin-needle sewing machine,

And the control means stops the twin needle sewing machine when it is determined that the operation state of the twin needle sewing machine is sewing or more.

According to a sixth aspect of the present invention, in the twin-needle sewing machine,

And a display unit for displaying an operation status of the twin needle sewing machine determined by the control unit.

According to a seventh aspect of the present invention, in the twin-needle sewing machine,

And the control means stops the twin needle sewing machine when it is determined that the operation state of the twin needle sewing machine is sewing or more.

According to the present invention, it is possible to detect various abnormalities of the twin needle sewing machine by detecting movement of the yarn stuck to the needle bar during operation and during operation stop. More specifically, it is possible to detect the sewing of the thread sewn on the sewing needle during the stop of operation, or to detect the error in which the sewing thread is reversely sewn, thereby reducing the sewing defect.

1 is a perspective view of a sewing machine according to an embodiment of the present invention.
2 is an enlarged perspective view showing the periphery of the surface portion of the sewing machine.
3 is an enlarged perspective view of the periphery of the surface viewed from a direction different from that of Fig.
Fig. 4 is a perspective view of the internal structure housed inside the front end portion on the side of the surface portion of the sewing machine arm portion. Fig.
5 is a front view of the needle bar switching mechanism.
6 is a perspective view of the needle bar switching mechanism.
Fig. 7 is a cross-sectional view showing the configuration of the needle bar stop portion inside the two needle bar portions. Fig.
8 is an exploded perspective view showing the connection state of the cam shaft of the switching drive unit and the base of the needle bar.
9 is a front view of the seal holding device.
10 is a perspective view of the seal holding device.
11 is a block diagram showing the control system of the sewing machine.
Fig. 12 (A) shows a state in which a sewing needle of one needle bar is selected as a sewing needle for sewing, Fig. 12 (B) shows a state in which a sewing needle of the other needle bar is used as a sewing needle Is a front view of the needle bar switching mechanism showing the selected state.
FIG. 13 is an explanatory diagram showing an example of a combination of signals detected by the first thread cutting sensor and the second thread cutting sensor; FIG.
Fig. 14 is an explanatory diagram showing a table serving as a reference for judging whether or not the operation state of the sewing machine is a sewing abnormality (abnormality), as an example of a combination of signals detected by the first thread cutting sensor and the second thread cutting sensor.
Fig. 15 is a flowchart showing an operation state determination process of the sewing machine.
16 is an explanatory diagram showing another table as a reference for judging whether or not the operation state of the sewing machine is sewing abnormality.
17 is a front view of another embodiment of the push-in projection of the changeover lever. Fig. 7 is an explanatory diagram showing a modification example of the switching lever. Fig.
18 is a perspective view of another embodiment of the seal holding device.
19 is a partially enlarged view of another embodiment of the seal holding device.
20 is a detailed view of another embodiment of the yarn holding device viewed from the Y direction.

[Outline of Embodiment]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to Figs.

The twin-needle sewing machine 100 (hereinafter referred to as the sewing machine 100) described as the present embodiment is a so-called electronic cycle sewing machine having a holding frame as a cloth holding part for holding a cloth as a sewing material to be sewed, As the frame relatively moves with respect to the sewing needle, a sewing pattern based on predetermined sewing data is formed on the cloth held by the holding frame. The present sewing machine 100 has two needle beds 110 and 120 and can selectively use the needle beds 110 and 120 for switching. Thereby, for example, two kinds of upper thread U1 and U2 having different characteristics such as color and thickness are respectively inserted into the sewing needles 11 and 12 equipped on the respective needle beds 110 and 120, As shown in FIG.

2 is an enlarged perspective view showing the vicinity of the face portion 105 of the sewing machine 100. Fig. 3 is an enlarged perspective view of the periphery of the face portion 105 viewed from a direction different from that of Fig. 2. Fig. to be.

Here, the vertical direction is the Z-axis direction, the horizontal direction orthogonal to the vertical direction is the X-axis direction (left and right direction), and the horizontal direction orthogonal to both the Z-axis direction and the X- ).

The sewing machine 100 includes two needle beds 110 and 120 for holding the sewing needles 11 and 12 at their lower ends to move up and down and a needle for moving the sewing needle up and down using the sewing machine motor 21 as a driving source A needle bar changing mechanism 30 for switching the one of the two needle bars 110 and 120 to perform the up and down moving operation and the upper thread moving mechanism 20 for moving the upper thread U1 A yarn tensioner 131 for raising (pulling up) the upper yarns U1 and U2 at the same cycle as that of the needle beds 110 and 120; A yarn holding device 60 for selectively holding an upper thread U1 or U2 wound on a sewing needle 11 or 12 for stopping up and down movement, An unillustrated bobbin mechanism having a single bobbin for weaving a lower thread (not shown) on the upper thread U1 or U2, A cloth moving mechanism 80 as a moving mechanism for arbitrarily determining a moving position along the X-Y plane while keeping the cloth, a sewing machine frame 101 for supporting each configuration of the sewing machine 100, A center presser 15 for suppressing vertical movement and first and second thread feeding detecting means for detecting presence or absence of feeding of the upper chambers U1 and U2, respectively, as first and second thread feeding detecting means, A yarn end cutting device 18 for holding yarn cutting sensors 161 and 162 and an end portion of an upper thread U1 or U2 laid down from a sewing needle 11 or 12, an operation panel 70 for an operator to perform various operations on the sewing machine and input of various data, and a control device 90 as a control means for performing the operation control of each of the above- Respectively.

[Sewing machine frame]

As shown in Fig. 1, the sewing machine 100 is provided with a sewing machine frame 101 whose outer shape has a substantially inverted U-shape when viewed in the X-axis direction. The sewing machine frame 101 includes a sewing machine arm portion 102 that forms an upper portion of the sewing machine 100 and extends in the Y axis direction, a sewing machine bed portion 103 that forms a lower portion of the sewing machine 100 and extends in the Y axis direction, And a vertical body portion 104 connecting the sewing machine arm portion 102 and the sewing machine bed portion 103. [

[Thinning mechanism]

1, the cloth shifting mechanism 80 includes a holding frame 81 for holding the object to be peeled on the upper surface of the sewing machine bed portion 103, a supporting arm 81 for supporting the holding frame 81 so as to be able to move up and down, An X-axis motor 83 (see Fig. 11) for moving the holding frame 81 in the X-axis direction through the supporting arm 82 and a Y And a Y-axis motor 84 (see Fig. 11) for moving the motor in the axial direction.

With this configuration, the cloth-moving mechanism 80 can determine the movement position of the pick-up article to an arbitrary position in the X-Y plane through the holding frame 81, and perform the needle-dropping operation to an arbitrary position per one needle So that it is possible to form needle sweat freely.

[Needle up and down mechanism]

Fig. 4 is a perspective view of the internal structure housed inside the front end portion on the side of the face portion 105 of the sewing machine arm portion 102. Fig.

As shown in the figure, the needle up-and-down moving mechanism 20 includes a vertical shaft 22 rotatably supported in the sewing machine arm portion 102 along the Y-axis direction, a rotary shaft 22 extending from one end of the upper shaft 22, A balance weight 23 provided at the other end of the upper shaft 22 and a balance weight 23 provided at a position eccentric from the rotation center of the balance weight 23 A crank rod 24 connected at one end thereof so as to be rotatable about a Y axis via a needle bar crank not shown and a needle bar holder 25 for selectively holding the needle bar 110 or 120. [

The needle up-and-down moving mechanism 20 is configured such that the upper shaft 22 is rotated by the output of the sewing machine motor 21 and the rotating operation is performed by the balancing weight 23, the needle bar crank and the crank rod 24 in the up- Conversion. So that the needle bar holder (25) can be moved up and down by one needle bar (110 or 120) held by the needle bar holder (25).

The connection structure between the needle bar holder 25 and each of the needle bars 110 and 120 will be described later.

[Thread extraction mechanism]

4, the thread take-up mechanism 14 includes a bell crank-shaped thread take-out 141 formed at one end thereof with a threading hole for threadingly inserting the upper thread U1 and the thread U2, And a thread take-up crank 142 that is supported so as to be rotatable in a frame within the frame. The base of the thread take-up part 141 is rotatably supported on the balance weight 23, and the middle part between the base end part and the tip end part is connected to the rotation end part of the thread take-up crank 142. When the upper shaft 22 rotates, the proximal end portion of the thread take-up shaft 141 carries out a circumferential movement, and the distal end portion of the thread take-up shaft 141 is moved upward and downward A predetermined up / down movement operation at a different speed is performed.

[First and second thread cutting sensors and thread tension adjusters]

2, the upper yarns U1 and U2, which are fed from a spool holder (not shown), are fed to the sewing machine arm portion 102, Each of the thread paths is formed by a plurality of yarn guides 171 and 172 provided on the right side portion of the arm portion 102. In the middle of the thread path, the first and second thread cutting sensors 161 and 162, the thread tension adjusters 131 to 133 and the thread take-up device 141 are disposed in order, and the upper thread U1 and U2, And is guided to the respective sewing needles 11 and 12 via a thread holding device 60 (see Fig. 11) provided below the face portion 105. [

The upper thread U1 is inserted into the first thread cutting sensor 161 and the upper thread U2 is inserted into the second thread cutting sensor 162 through the upper thread U1. The thread cutting sensors 161 and 162 are provided with a light source and an optical sensor composed of a light receiving element at a position where the upper thread U1 and U2 pass. , U2) can be detected in either the movement or the stopping state. The first thread cutting sensor 161 detects the movement of the upper thread U1 and the second thread cutting sensor 162 detects the movement of the upper thread U2.

For example, since the upper thread U1 and U2 sewing are repeatedly moved and stopped at a predetermined cycle to interlock with the up and down movements of the sewing needles 11 and 12 (needle beds 110 and 120) It is possible to detect that the normal sewing is performed by detecting a signal that repeats the ON signal accompanying the movement and the OFF signal accompanying the stop at predetermined intervals.

That is, the thread cutting sensors 161 and 162 for detecting the movement of the upper thread U1 and U2 sewing are configured to detect only the ON signal or the OFF signal without detecting the ON / OFF signal repeated at predetermined intervals, It is expected that a sewing abnormality has occurred.

Since the upper thread U1 and U2 which are not being sewed are stopped without being fed out, the thread cut sensors 161 and 162 continuously detect the OFF signal accompanied by the stop, thereby detecting no abnormality in the upper thread Can be detected.

That is, when the thread cutting sensors 161 and 162 for detecting the movement of the upper thread U1 and U2, which are not sewing, detect the ON signal without detecting the subsequent OFF signal and detect the movement of the upper thread, It is expected that sewing abnormality is occurring.

The control for detecting the movement of the upper chambers U1 and U2 by the first thread cutting sensor 161 and the second thread cutting sensor 162 to determine the operation state of the sewing machine 100 will be described later .

The upper thread U1 is wound on the thread tension regulator 131 and the upper thread U2 is wound on the thread tension regulator 132 so that the individual tension is given to the upper thread U1 and the upper thread U2 individually.

The yarn tension regulator 133 is commonly used for the upper yarns U1 and U2 and imparts the same yarn tension to these yarns.

The upper thread U1 and the lower thread U2 which extend over the thread tension adjuster 133 are provided in the respective threading holes 141 and 142 so as to protrude outward from the right side portion of the sewing machine arm portion 102. [ Respectively.

[Needle bar switching mechanism: All]

5 is a front view of the needle bar switching mechanism 30, and Fig. 6 is a perspective view. The needle bar switching mechanism 30 includes a needle base base 31 for supporting the two needle bars 110 and 120 so as to be movable up and down and a needle bar base 31 for supporting the needle bar 110 in the upper portion in the vicinity of the face portion 105 of the sewing machine arm portion 102. [ A supporting block 35 for supporting the base 31 and a holding state (vertical moving operation state) for the needle base base 31 and a holding state for the needle bar holder 25 A stop selector 33 for performing a switching operation of the retaining state with respect to each of the needle bar stoppers 32 and 32, (Switching drive mechanism) 34 for aligning the sewing needle 11 or 12 of the sewing machine 110 or 120 at a predetermined sewing position.

[Needle bar switching mechanism: base of the needle bar]

The needle base base 31 includes an upper block 311 and a lower block 312 which are spaced apart from each other in the vertical direction and a hypothetical portion 313 which is connected to the upper block 311 and the lower block 312, Like support portion 314 that extends further upward from the support portion 314 is integrally formed.

The base 31 of the needle base can be pivoted about the Y axis by the support block 35 through a support shaft 315 inserted into a support hole formed in the Y axis direction with respect to the support portion 314 . Further, the support block 35 is fixed to the sewing machine arm portion 102 by a not shown screw.

The upper block 311 and the lower block 312 are vertically arranged at a predetermined distance from each other by the hypothetical portion 313. The upper block 311 and the lower block 312 are all provided with the needle bar 110 The needle bar insertion holes 316 and 316 for inserting the needle bar insertion holes 317 and 317 and the needle bar insertion holes 317 and 317 are vertically passed through the needle bar insertion holes 316 and 316.

The needle bar insertion holes 316 and 316 and the needle bar insertion holes 317 and 317 are all formed to penetrate along the longitudinal direction of the needle base base 31. [ Therefore, when the longitudinal direction of the needle base base 31 is set to be parallel to the Z axis direction, the respective needle bar insertion holes 316 and 316 and the respective needle bar insertion holes 317 and 317 are also parallel to the Z axis direction do.

One needle bar insertion hole 316 and one needle bar insertion hole 317 are concentric and have the same diameter and the other needle bar insertion hole 316 and the other needle bar insertion hole 317 And are formed so as to be concentric and of the same diameter.

One of the needle beds 110 is supported on one of the needle bar insertion holes 316, and the lower portion thereof is supported by one of the needle bar insertion holes 317. The other needle bar 120 is supported at its upper portion by the needle bar insertion hole 316 at the other side and its lower portion is supported by the needle bar insertion hole 317 at the other side.

Each of the needle bar insertion holes 316 and 316 and the needle bar insertion holes 317 and 317 is provided with a sliding bearing not shown inside thereof so that each of the needle bars 110 and 120 can move up and down smoothly . That is, the needle base base 31 supports the two needle beds 110 and 120 so as to be movable up and down.

[Needle bar switching mechanism: stopper of the needle bar]

Each of the needle bar 110 and the needle bar 120 has a hollow tube shape and a part of the needle bar stop 32 is accommodated in the inside thereof. Fig. 7 is a cross-sectional view showing the configuration of the needle bar stopper 32 inside the needle bar 110 and 120 by cutting out the needle bar 110 and 120, respectively.

Each of the needle bar stoppers 32 can switch the respective needle beds 110 and 120 into the holding state with respect to the needle base base 31 and the holding state with respect to the needle holder 25. The stop selector 33 described later performs a predetermined external operation on each of the needle bar stoppers 32 so that one needle bar 110 is held by the needle bar holder 25 and the other needle bar 120 And a second selection state in which one of the needle bars 110 is held on the needle base base 31 while the other needle bar 120 is held in the needle bar holder 25, So that only one of the needle beds 110 or 120 can be selectively moved up and down.

The needle bar stopper 32 provided on each of the needle bar 110 and the needle bar 120 has the same configuration. A pin protruding and retracting hole 111, an upper ball protruding and ejecting hole 112 and a lower ball protruding and retracting hole 113 formed in the needle bar 110 in correspondence with the needle bar stopper 32 and a pin The projecting / retracting hole 121, the upper side ball projecting / retracting hole 122 and the lower side ball projecting / retracting hole 123 (all of which will be described later) have the same structure.

Therefore, only the needle bar stopper 32 on the needle bar 110 side will be described, and the description of the needle bar stopper 32 on the needle bar 120 side will be omitted.

The needle bar stopper 32 includes a stopper rod 321 inserted into the tubular shape of the needle bar 110 and a pressing spring 321 for urging the stop bar 321 upward in the needle bar 110 A needle bar drive ball 323 and a needle bar stop ball 324 which are respectively fittable to the upper and lower ball protrusions and depressions 112 and 113 penetrating from the inside of the needle bar 110 to the outer circumferential surface, And a stopper 325 fixed to the outer periphery of the needle bar holder 25 to prevent the needle bar 110 from dropping.

The stopper rod 321 is provided at its upper end with a pin-shaped portion 321a whose diameter is smaller than other portions of the stopper rod 321. The stopper rod 321 is pressurized upward by the pressure spring 322, Shaped portion 321a protrudes upward outward from the pin protruding and retracting hole 111 formed in the upper end surface of the needle bar 110. [

The stopper bar 321 is formed with first and second groove cam portions 321b and 321c at two upper and lower positions. These groove cam portions 321b and 321c are formed to have a smaller diameter than other portions of the stopper rod 321. The first groove cam portion 321b located on the upper side is formed with a conical tapered portion And the second groove cam portion 321c located on the lower side is formed with a conical tapered portion at an inner upper portion of the groove.

A needle bar drive ball 323 and a needle bar stop ball 324 are accommodated in the respective spaces formed between the inner wall surface of the needle bar 110 and the groove cam portions 321b and 321c.

An upper ball protruding and ejecting hole 112 penetrating from the inside to the outside is formed at a position where the needle bar driving ball 323 accommodated in the first groove cam portion 321b of the needle bar 110 faces, At the position where the needle stop ball 324 housed in the second groove cam portion 321c faces, a lower side ball protruding and retracting hole 113 penetrating from the inside to the outside is formed.

The upper ball protruding and retracting hole 112 is larger in diameter than the needle bar drive ball 323 on the inner side of the needle bar 110 and smaller in diameter as the ball needle 110 protrudes from the outer periphery of the needle bar 110 than the needle bar drive ball 323 It has a slightly smaller diameter. In addition, the inner diameter of the lower ball projecting / retracting hole 113 and the needle stop ball 324 have the same relationship.

When the pin-shaped portion 321a of the stopper rod 321 protrudes to the maximum extent (hereinafter simply referred to as the "protruding state"), the first groove cam portion 321b is formed with respect to the upper- And the second groove cam portion 321c is positioned at a position where the second groove cam portion 321c coincides with the lower-side ball projection / In this state, the needle bar drive ball 323 is partly protruded from the upper ball protruding and retracting hole 112, and the needle ball stop ball 324 is retracted inward from the lower ball protruding and retracting hole 113 See the needle bar 120 in Fig. 7).

When the pin-shaped portion 321a of the stopper rod 321 is press-fitted (for example, about half of the protruding length of the pin-like portion 321a to the entire length: hereinafter referred to as the "press-fit state"), The second groove cam portion 321c is located at a position slightly lower than the lower groove protruding and retracting hole 113. In this case, the first groove cam portion 321b is positioned at a position where the first groove cam portion 321b coincides with the ball projecting / In this state, the needle bar drive ball 323 is retracted inward from the upper ball protruding and retracting hole 112, and the needle bar stop ball 324 is partially protruded from the lower ball protruding and retracting hole 113 See the needle bar 110 in Fig. 7).

When the needle bar 110 is positioned at the top dead center and the needle bar holder 25 is also at the top dead center position and the pin shaped portion 321a of the stop bar 321 is in the protruding state, The needle bar holder 25 can be inserted up and down by the needle bar drive ball 323 and the stopper 325 partially protruding from the needle bar holder 32. [ This makes it possible to bring the needle bar 110 into the holding state with respect to the needle bar holder 25 and transmit the upward and downward movement from the needle up-and-down moving mechanism 20 to the needle bar 110.

A ball stopper 326 is provided on the upper surface of the lower block 312 of the needle base base 31. When a projection is present on the outer peripheral surface of the needle base 110, And is prevented from descending. However, when the pin-shaped portion 321a is in the protruding state, the stopper ball 324 retreats to the inside of the lower ball protruding and retracting hole 113, so that the up and down movement of the needle bar 110 relative to the needle base base 31 is restricted Do not.

Therefore, the needle bar 110 is in the operating state of the up-and-down movement.

On the other hand, when the needle bar 110 is positioned at the top dead center and the needle bar holder 25 is also in the top dead center position, when the pin-shaped portion 321a of the stop bar 321 is press- The needle bar drive ball 323 is retracted from the needle bar holder 112 so that the needle bar holder 110 is released from the holding state with respect to the needle bar holder 25.

When the pin-shaped portion 321a is in the press-fit state, the ball stopper ball 324 protrudes from the lower-side ball protruding and retracting hole 113, Is prevented from being lowered. The stopper 325 is disposed so as to abut or come close to the lower surface of the upper block 311 of the needle base base 31 when the needle bar 110 is positioned at the top dead center, It is also prevented that the needle bar 110 moves upward beyond the top dead center position.

Therefore, the needle bar 110 is in a holding state with respect to the needle base base 31. [

As described above, the needle bar stopper 32 pushes the needle bar 110 into the needle bar holder 25 (FIG. 25) by performing the pushing operation of the pin-shaped portion 321a of the stop bar 321 when the needle bar 110 is at the top dead center. To the holding state (top dead center position stop state) with respect to the needle bed base 31 from the holding state (up-and-down moving operation state) with respect to the needle base base 31. [ When the press-fitting operation of the pin-shaped portion 321a is released, the pressing spring 322 can automatically return to the holding state for the needle bar holder 25 from the holding state for the needle base base 31. [

[Needle bar switching mechanism: switching drive unit]

In the needle bar switching mechanism 30, the needle base base 31 is pivoted about the Y axis with the support shaft 315 as the center, so that the sewing needle 11 or 12 can be selected.

Therefore, in the switching drive section 34, the tip end portion of the sewing needle 11 when positioned at the midpoint between the top dead center and the bottom dead center and the tip end portion of the sewing needle 12 positioned at the midpoint between the top dead center and the bottom dead center And the needle base base 31 is rocked so as to have an inclination angle that coincides with a perpendicular perpendicular to the center line of the support shaft 315 and perpendicularly to the downward direction. The state in which the front end of the sewing needle 11 and the front end of the sewing needle 12 are inclined at the same angle as the waterline is referred to as a "sewing position" in the sewing needle 11 or the sewing needle 12 do. Then, each of the sewing needles 11 and 12 forms a needle sweat by sharing one center presser foot 15 and one hook.

4 to 6, the switching drive section (switching drive mechanism) 34 includes an air cylinder 341 serving as a driving source of the swing motion of the needle base base 31, An input arm 346 to which one end of the link member 343 is connected and a link member 343 to which one end of the link crank 342 is connected to the other pivot arm of the bell crank 342; An eccentric cam 344a provided on the other end side of the camshaft and a square die 347 on which the eccentric cam 344a is mounted are provided with a cam shaft 344 whose one end is fixedly connected to the cam shaft 346, As shown in Fig.

When the plunger of the air cylinder 341 performs the advancing and retreating operation, the bell crank 342 rotates, and the link member 343 moves forward and backward. The other end of the link member 343 is connected to the rotating end of the input arm 346 so that the rotation of the input arm 346 can be imparted to the input arm 346 by the operation of the air cylinder 341. The air cylinder (second actuator) 341 is swingably supported on the sewing machine frame 101. The displacement of the air cylinder (second actuator) 341 in the X-axis direction occurring in the connecting portion with the bell crank 342 in the forward / backward movement of the plunger Position by the rocking motion.

The cam shaft 344 fixedly connected to the input arm 346 has a circular eccentric cam 344a eccentric to the rotation center. Then, the eccentric cam 344a is inserted into the hole 347a of the square die 347 as shown in Fig. The square die 347 is fitted in the fitting engagement groove 318 formed in the lower block 312 of the needle base base 31. The fitting engagement groove 318 is formed in the lower portion of the needle base base 31 along the longitudinal direction thereof (parallel to the rocking radius direction of the needle base base 31). When the cam shaft 344 rotates through the input arm 346 by driving the air cylinder 341, the square die 347 moves in the left-right direction (X-axis direction) .

Each configuration of the switching driver 34 is such that the sewing needle 11 is in the sewing position when the plunger of the air cylinder 341 is in the advancing position and the plunger of the air cylinder 341 is in the retracting position The dimension of each part is designed so that the sewing needle 12 is in the sewing position. Either one of the constituent elements of the needle base base 31 or the switching drive section 34 is provided so as to stop accurately at the position at which the sewing needle 11 becomes the sewing position and at the position at which the sewing needle 12 becomes the sewing position. May be provided. In this case, the position of each stopper can be adjusted so that the position of the sewing needles 11 and 12 can be adjusted.

[Needle bar switching mechanism: stop selection part]

The stop selector (stop selection mechanism) 33 performs a push-fitting operation on the respective pin-shaped portions 321a and 321a with respect to the needle bar stopper portions 32 and 32 of the needle bar 110 and the needle bar 120 (The state in which one of the needle bars 110 is held in the needle holder 25 and the other needle bar 120 is held in the needle bar base 31) and the second selected state 110 is held in the base 31 of the needle bar base and the other needle bar 120 is held in the needle bar holder 25).

5 to 7, the stop selection unit 33 includes an air cylinder (actuator) 331 serving as a driving source for the state change operation of the needle bar 110 and the needle bar 120, And a switching lever (switching member) 332 to which the input arm 332a is connected to the plunger.

The support block 35 is fixed to the sewing machine arm portion 102. The support shaft 315 is fixed to the support block 35. The support shaft 315 supports the needle base base 31 and the switching lever 332 so as to be rotatable around the Y axis. Further, the switching lever 332 is arranged close to the upper side of the two needle beds 110, 120.

The switching lever 332 includes an input arm 332a extending in the radial direction around the support shaft 315 and two pushing projections 332a extending in the radial direction different from the input arm 332a 332b, and 332c.

The switching lever 332 is rotatably supported on the support shaft 315 with the input arm 332a facing upward. The input arm 332a is connected to the plunger of the air cylinder 331 supported by the support block 35. [ The air cylinder 331 is supported by the support block 35 so as to be swingable so that the air cylinder 331 moves in the direction of the Z axis generated in the connecting portion of the switching lever 332 with the input arm 332a The displacement can be allowed by the rocking motion.

Each of the two press-fitting projections 332b and 332c is directed downward and one of the press-fitting projections 332b is engaged with the pin-shaped portion 332b protruded from the needle bar 110 in accordance with the plunger retreat operation of the air cylinder 331 And the other press-fitting projection 332c is switched to a position opposed to the pin-shaped portion 321a protruding from the needle bar 120 in accordance with the advancing operation of the plunger of the air cylinder 331 .

The protruding lengths of the respective press-fitting projections 332b and 332c are such that when the needle beds 110 and 120 rise to the top dead center, the respective pin-like portions 321a and 321a are lifted up to the respective needle beds 110 and 120 In which the press-in amount can be changed.

The swinging motion of the needle base base 31 by the switching drive section 34 and the switching operation to the first or second selected state by the stop selection section 33 are performed in association with each other.

That is, when the needle bars 110 and 120 are switched to the first selected state (state in which the needle bar 110 moves up and down) by the switching lever 332 of the stop selector 33, The selector lever 332 of the stop selector 33 turns the needle bars 110 and 120 into the second selected state (The state in which the needle bar base 120 moves up and down), the switching drive unit 34 performs the swinging operation so that the needle bar 120 of the needle base base 31 becomes the sewing position.

Therefore, when each of the press-in projections 332b and 332c of the switching lever 332 is rotated to a position opposed to the pin-shaped portions 321a and 321a of the respective needle beds 110 and 120, The dimensions of the input arm 332a and the press-fit projections 332b and 332c of the changeover lever 332 and the stroke of the air cylinder 331 are set so as to be an appropriate position in consideration of the angle.

It is also possible to provide two stoppers so that the press-in projections 332b and 332c of the changeover lever 332 stop accurately at an appropriate position when the air cylinder 331 is operated. In this case, the positions of the respective stoppers can be adjusted so that the stop positions of the press-fit projections 332b and 332c can be adjusted.

[Closed-end clamp device]

The yarn end clamp device 18 includes a wiper capable of removing the upper thread end portion extending from the needle hole of the sewing needles 11 and 12, a suction port capable of sucking the upper thread end portion guided by the wiper, A ball for holding the guided upper thread end portion, and an air cylinder 181 (shown in Fig. 11) for moving the ball to the suction port side.

After sewing the upper thread to both of the left and right sewing needles 11 and 12 at the start of sewing, the operator operates the operation panel, not shown, to drive the wiper so that the left and right upper thread U1, . At the start of sewing, the left and right upper thread ends are sucked into the suction port. However, since the suction force to the yarn is weak, when one needle moves up and down to form needle sweat, suction to one yarn is released. When the needles are formed into multiple needles, the ball moves and supports the upper thread of the other needle which does not form the needle sweat, so that the upper thread of the other needle is not curled and stitched. After the thread cutting, the wiper is automatically driven to suck the upper thread end portion.

[Thread retaining device]

Fig. 9 is a front view of the seal holding device 60, and Fig. 10 is a perspective view. The yarn holding device 60 is configured such that an upper thread U1 or U2 inserted through a sewing needle 11 or 12 which is not selected as a sewing needle for sewing is moved in accordance with the pulling operation of the thread take- So as not to come off from the sewing needle 11 or 12.

The thread holding device 60 is provided with a movable holding member 61 provided at the lower side of the front side of the needle base base 31, And a fixed holding member 62 having two opposing portions 621 and 622.

The movable holding member 61 is fixed to the lower portion of the needle base base 31 (on the side of the sewing needles 11 and 12 with respect to the supporting shaft 315) and has a thread holding portion 611 are formed. The thread holding portion 611 has a rectangular flat plate shape along the X-Y plane, and both left and right side edge portions 611a and 611b are formed parallel to the Y-axis direction.

The fixed holding member 62 is fixed to the frame of the surface portion 105 and the opposing portions 621 and 622 are provided so as to be parallel to the YZ plane.

The movable holding member 61 is disposed so that the seal holding portion 611 is loosely inserted between the opposing portions 621 and 622 of the fixed holding member 62. [ One of the opposing portions 621 of the fixed holding member 62 is opposed to the one side edge portion 611a of the seal holding portion 611 in the X axis direction on the left side, The other opposing portion 622 of the fixed holding member 62 is opposed to the other side edge portion 611b in the X axis direction on the right side.

A clearance between one side edge portion 611a of the thread holding portion 611 and one of the opposing portions 621 of the fixed holding member 62 is formed by an upper thread U1 inserted through the sewing needle 11, And an upper thread U1 extending from the thread take-up lever 141 to the sewing needle 11 is inserted through the first thread feeding unit.

A clearance between the other side edge portion 611b of the thread retaining portion 611 and the other opposing portion 622 of the fixed retaining member 62 is formed by an upper thread U2 inserted through the sewing needle 12 And the upper thread U2 passing through the thread take-up lever 141 to the sewing needle 12 is inserted through the second needle threading unit.

The movable base 61 is provided on the needle base base 31 for reciprocally oscillating along the X axis direction and the needle base base 31 is provided with a needle bar switching mechanism (not shown) for selecting the sewing needles 11, 30 is imparted with a swing motion by the switching driver 34. [

When the sewing needle 11 is selected, the switching drive unit 34 swings the lower end of the needle base base 31 to the right, so that the other side edge of the thread holding portion 611 of the movable holding member 61 (611b) comes into contact with the other opposing portion (622) side of the fixed holding member (62). As a result, the upper thread U2 on the side of the sewing needle 12 which is not in use becomes in a state of being held by them, and the upper thread U2 is pulled out of the sewing needle 12 against the pulling action of the thread take- Can be prevented.

When the sewing needle 12 is selected, the switching drive unit 34 swings the lower end of the needle base base 31 to the left, so that the one side edge of the thread holding portion 611 of the movable holding member 61 The portion 611a is brought into contact with the side of the one opposed portion 621 of the fixed holding member 62. [ As a result, the upper thread U1 on the side of the sewing needle 11 that is not in use becomes in a state of being held by them, so that the upper thread U1 is pulled out of the sewing needle 11 against the pulling action of the thread take- Can be prevented.

[Center presser foot]

The center presser foot 15 is provided with a frame-shaped portion which can loosely fit the sewing needle 11 or 12 selected at the time of sewing, and the frame-shaped portion is provided with a small stroke in synchronization with the sewing needle 11 or 12, So that the cloth is prevented from being shaken up and down by friction with the sewing needle 11 or 12, and at the same time, the sewing needle 11 or 12 is reliably removed from the cloth.

The center presser foot 15 is supported by a not shown central presser foot drive mechanism provided in the sewing machine arm section 102. The center presser foot drive mechanism is driven by the power from the upper shaft 22, A vertical movement operation is given.

[Thread winder mechanism]

The yarn winder mechanism 19 (see Fig. 2) is a mechanism for winding the lower thread on a bobbin provided inside the bobbin case. The yarn winder mechanism 19 is provided with a bobbin holding table 19a for setting the bobbin and a power transmitting mechanism for imparting rotational motion to the bobbin holding table 19a with power from the upper shaft 22. The power transmission mechanism is provided with a detection lever 19b for detecting that the bobbin has been set on the bobbin support 19a. When the bobbin is detected by the detection lever 19b, 19a. In addition, the detection lever 19b is configured such that the transmission of power from the upper shaft 22 to the bobbin holder 19a is cut off when a predetermined amount of lower thread is wound on the bobbin.

[Operation panel]

The operation panel 70 (see FIG. 11) includes a touch panel 71 and a liquid crystal panel 72. The operation panel 70 and the control device 90 of the sewing machine are connected by wire or wireless lines.

The touch panel 71 is disposed on the display screen of the liquid crystal panel 72 and has a function of detecting the contact position of the liquid crystal panel 72 with respect to the display screen.

The liquid crystal panel 72 is a display unit having an operation key group having various keys and buttons, and a function of displaying various sewing data and various display screens.

That is, the operation panel 70 can be operated by touching an operation key group or the like displayed on the liquid crystal panel 72, for example, by an electromagnetic induction type, a magnetostrictive type, a capacitive type, ), And the like, detects the position where the touch panel 71 is touched, and performs various operations of the sewing machine, input of various data, and displays various display screens according to the detected position .

For example, the operation panel 70 selects and sets a sewing abnormality pattern to be an object of determination of the operation state of the sewing machine 100 from a plurality of sewing abnormality patterns stored in storage means (data memory 94) And functions as a part of the setting means.

[Control system of sewing machine: control device]

Fig. 11 is a block diagram showing a control system of the sewing machine 100. Fig. The sewing machine 100 is provided with a control device 90 as a control means for controlling the operations of the above-described components and members. The control device 90 includes a ROM 92 in which a program for performing operation control in sewing is stored, a RAM 93 as a work area for arithmetic processing, a memory 93 for storing various data such as sewing data, Volatile data memory 94 as a nonvolatile memory and a CPU 91 for executing a program in the ROM 92. [

The CPU 91 is connected to a sewing machine motor drive circuit 21a, an X-axis motor drive circuit 83a and a Y-axis motor drive circuit 84a via an interface (not shown) The X-axis motor 83, and the Y-axis motor 84 in accordance with the control signal from the control unit.

The sewing machine motor 21 is a servo motor in which an encoder (not shown) is juxtaposed, and the detected angle is output to the CPU 91. [

The X-axis motor 83 and the Y-axis motor 84 are stepping motors, and their origin search means, not shown, are connected to the CPU. Based on the output, the CPU 91 drives the motors 83, Can be recognized.

The CPU 91 is also connected to the air cylinder 331 of the stop selection portion 33 of the needle bar switching mechanism 30 and the air cylinder 331 of the switching drive portion 34 of the needle bar switching mechanism 30, 347a, and 182a for controlling the electromagnetic valves 333, 347, and 182 that operate the air cylinder 181 of the seal clamping device 181 and the air cylinder 181 of the seal clamp device 18, respectively.

The yarn tension regulator 133 of the yarn tension regulators 131 to 133 incorporates a solenoid and can control the yarn tension arbitrarily under the control of the control device 90. [ Therefore, the driving circuit 133a of the thread tension regulator 133 is also connected to the CPU 91 via an interface (not shown).

The first and second thread cutting sensors 161 and 162 for detecting the state of the upper thread U1 and U2 are connected to the CPU 91 via the sensor driver 160a .

The sewing data stored in the data memory 94 includes the X-axis motor 83 and the Y-axis motor 84 for moving the cloth to the needle drop position of each needle for sewing a predetermined sewing pattern Selected sewing needle data for determining which sewing needle 11 or 12 is to be used and yarn tension data for determining the yarn tension are recorded in the sewing machine 10. The CPU 91 determines whether the sewing needle 11 And executes the operation control of each configuration of the sewing machine.

For example, when the CPU 91 has read out the cloth feed data of each needle, the X-axis motor 83 and the Y-axis motor 84 are driven at a timing at a predetermined height angle, .

When the CPU 91 has read the actual tension data, the built-in solenoid of the thread tension regulator 133 is driven at a timing at a predetermined phase angle to drive the target solenoid to the target thread tension.

The data memory 94 is provided with a combination of the driving states of the two needle bars 110 and 120 and the movement of the upper chambers U1 and U2 capable of detecting the two thread cutting sensors 161 and 162 And data related to a plurality of sewing abnormality patterns based thereon is stored. The sewing abnormality pattern will be described later.

When the CPU 91 has read the selected stitching needle data during sewing, the "sewing machine motor stop", "upper and lower thread cutting", and "switching of the sewing needle to be used" are executed in order.

That is, in the " stop of the sewing machine motor ", the CPU 91 controls the sewing machine motor 21 to stop at a predetermined upper angle.

In the " upper and lower thread cutting ", the CPU 91 controls the thread cutting motor (not shown) to perform thread cutting of the upper thread and the lower thread that have been sewing until then.

The CPU 91 operates the air cylinder 331 of the stop selection portion 33 of the needle bar switching mechanism 30 and the air cylinder 341 of the switching drive portion 34 And the switching lever 332 and the needle base base 31 are oscillated.

Thus, the press-in position of the pin-shaped portion 321a projecting from the upper end of the needle bar 110 or 120 by the switching lever 332 is switched. In addition, the needle base base 31 is pivoted, and the sewing needle 11 or 12 is positioned at the sewing position.

[Switching operation of sewing needle to be used]

The above-mentioned " switching of the sewing needles to be used " will be described in more detail based on the operation explanatory diagram of Fig.

When the CPU 91 of the control device 90 reads the selection stitching needle data from the sewing data during the sewing for forming the sewing pattern, for example, the CPU 91 switches from the stitching needle that has been sewing to another stitching needle . Here, a case of switching from the sewing needle 12 to the sewing needle 11 is exemplified.

First, the CPU 91 stops the sewing machine motor 21 to stop the rotation of the upper shaft 22 at the upper stop position, which is a predetermined upper limit stop angle. For example, the upper shaft angle of the upper stop position is the upper dead point of the thread take-up 141 (e.g., the range of 30 to 50 degrees of the upper shaft angle when the needle bar top dead center is 0 deg. At this time, since the sewing machine motor 21 is stopped at the position passing the needlepoint upper dead center, the needle bar 120 holding the sewing needle 12 that has been sewing up to that time causes a slightly lowering operation than the top dead center position. 12A shows a state in which the needle bar 120 is largely lowered. However, the height difference between the needle bar 110 and the needle bar 120 stopped at the upper stop position is smaller than that in the case of Fig. 12A.

In this stop state, the yarn cutting motor not shown is controlled to perform yarn cutting of the upper and lower yarns that have been sewing up to that time. Next, the wiper of the real end clamp device 18 is driven to guide the upper thread end of the left and right sewing needles 11, 12 to the suction port and suck it.

Thereafter, as shown in Fig. 12 (B), the air cylinder 341 of the switching drive section 34 of the needle bar switching mechanism 30 is operated to swing the lower end of the needle base base 31 in the rightward direction . Thereby, the sewing needle 11 is shifted to the sewing position after the sewing needle 12 is moved away from the sewing position (the position directly beneath the support shaft 315).

The air cylinder 331 of the stop selector 33 is operated so that the press-in protrusion 332c of the switching lever 332 rotates in the pin-shaped portion 321a of the needle bar base 120 of the needle base base 31 after the swing The switching lever 332 is rotated so as to be in the opposite position.

At this point of time, since the needle bar 12 is slightly lowered, the switching lever 332 can be rotated without causing interference between the press-in protrusion 332c and the pin-shaped portion 321a of the needle bar 120. [

The pushing protrusion 332b is displaced from the position opposed to the pin-shaped portion 321a of the needle bar 110 by the rotation of the switching lever 332 so that the stop bar 321 inside the needle bar 110 is moved (322) to move upward. As a result, the groove cam portion 321c moves upward and the needle ball stop ball 324 retreats inward in the lower ball projection-and-through hole 113 (see Fig. 7). Thus, the state in which the needle bar 110 is held on the needle base base 31 is released. Since the upper shaft 22 is stopped at the position where the upper axis angle passes the needlepoint upper dead center, the needle bar holder 25 is slightly lowered. Therefore, at this point, The ball 323 can not be protruded outward from the upper ball protruding and retracting hole 112 and the needle bar 110 is not held in the needle bar holder 25.

Then, the CPU 91 drives the sewing machine motor 21 to rotate in the reverse direction so as to return it from the upper stop position (the upper dead point of the thread take-up) to the needle point upper dead center. As a result, the needle bar 120 and the needle bar holder 25 are raised, and the pin-shaped portion 321a of the needle bar 120 abuts against the press-in projection 332c of the changeover lever 332 and is press-fitted downward. Therefore, the groove cam portion 321b of the stopper bar 321 in the needle bar 120 is lowered, and the needle bar drive ball 323 is retracted inward from the upper side ball projection / Further, the groove cam portion 321c is also lowered so that the needle bar stop ball 324 protrudes from the lower-side ball protruding and retracting hole 123. Thus, the needle bar 120 is released from the holding state of the needle bar holder 25, and is switched to a state held by the needle bar base 31. [

On the other hand, in the needle bar 110, the needle bar drive ball 323 protrudes from the upper ball protruding and ejecting hole 112 and is held in the needle bar holder 25.

12 (A) to 12 (B), in the thread holding device 60, the movable holding member 61 moves to the right side, The left side edge portion 611a of the portion 611 releases the upper thread U1 held between the left side edge portion 611a and the opposing portion 621. [ The right side edge portion 611b of the seal holding portion 611 of the movable holding member 61 abuts the opposing portion 622 to hold the upper thread U2 therebetween.

Thereafter, the sewing machine motor 21 resumes rotation in the normal rotation direction, and the needle drop by the sewing needle 11 is performed. However, the upper thread U2 of the sewing needle 12 is pulled out of the thread holding portion 611 The occurrence of dropout from the sewing needle 12 can be prevented even if the sewing needle 141 is pulled upward (pulled up) by the thread take-up lever 141 . When the needle of the sewing needle 12 is inserted into the sewing needle 12, the needle of the sewing needle 12, which is not forming the needle sweat, The upper thread of the sewing needle 11 is prevented from being caught in the sewing needle 11 and stitched.

In addition, as the selection stitch needle data in the sewing data is read, it is not limited to the "switching of the sewing needles to be used", and for example, the "selection stitching needle" key (not shown) in the operation panel 70 is pressed It is also possible to perform sewing by the upper thread U1 and U2 on the side of the desired sewing needles 11 and 12 (needle beds 110 and 120) by performing the above-described " switching of sewing needles to be used " .

[Judgment of operation situation of twin needle sewing machine]

Next, determination of the operation status of the sewing machine using the first thread cutting sensor 161 and the second thread cutting sensor 162 in the sewing machine 100 will be described. The first thread cutting sensor 161 and the second thread cutting sensor 162 are collectively referred to as two sensors for detecting the movement of the upper thread.

Here, a case in which one needle bar 110 is selected and sewing by a sewing needle 11 provided on the needle bar 110 is described as an example. The same is true in the case of sewing with the sewing needle 12 provided on the other needle bar 120, and a description thereof will be omitted.

For example, in a case where normal needle sewing is performed without abnormalities in sewing by switching the driving of one needle bar 110 and sewing with the sewing needle 11 of the selected needle bar 110, . 1 ", the first thread cutting sensor 161 detects a signal that repeats an ON signal accompanying the movement of the upper thread U1 and an OFF signal accompanying the stop at a predetermined cycle, The sensor 162 continuously detects the OFF signal accompanying the stop of the upper chamber U2.

That is, when sewing is performed using the sewing needle 11 of the needle bar 110, the first thread cutting sensor 161 and the second thread cutting sensor 162 are arranged in the "No. Quot; 1 ", respectively, to detect that normal sewing is being performed.

When the sewing needle 11 of the selected needle bar 110 is sewn, the upper thread U2, which is not being sewn, is pulled to the upper thread U1 being sewn by switching the driving of the one needle bar 110 When a stitching abnormality occurs due to the stitching, "No. The first thread cutting sensor 161 detects a signal that repeats an ON signal accompanied by the movement of the upper thread U1 and an OFF signal accompanied by the stop at a predetermined cycle, The sensor 162 detects the ON / OFF signal of the upper thread U2 that is fed out at a period synchronous with the sewing upper thread U1.

That is, when sewing is performed using the sewing needle 11 of the needle bar 110, the first thread cutting sensor 161 and the second thread cutting sensor 162 are arranged in the "No. 3 ", it is possible to detect a sewing abnormality in which the upper thread U2 which is not being sewn is stitched.

When sewing with the sewing needle 11 of the selected needle bar 110 is performed by switching the driving of one needle bar 110 and sewing abnormality occurs in which the sewing upper thread U1 is actually cut, Fig. The first thread cutting sensor 161 continuously detects the OFF signal as the upper thread U1 does not move and the second thread cutting sensor 162 detects the upper thread U2, The OFF signal accompanying the stop of the photodetector is continuously detected.

That is, when sewing is performed using the sewing needle 11 of the needle bar 110, the first thread cutting sensor 161 and the second thread cutting sensor 162 are arranged in the "No. 2 ", it is possible to detect a sewing abnormality in which the sewing upper thread U1 is actually cut.

When the sewing needle 11 of the selected needle bar 110 is sewn, the upper thread U2, which is not being sewn, is wound on the thread take- When an abnormality has occurred, "No. The first thread cutting sensor 161 detects a signal that repeats an ON signal accompanied by the movement of the upper thread U1 and an OFF signal accompanied by the stop at a predetermined cycle, The sensor 162 detects an ON signal in which the upper thread U2 is continuously fed, or an ON / OFF signal that is not a predetermined period.

That is, when sewing is performed using the sewing needle 11 of the needle bar 110, the first thread cutting sensor 161 and the second thread cutting sensor 162 are arranged in the "No. 4 ", it is possible to detect a sewing abnormality in which the upper thread U2 is wound around the thread take-up 141 and the upper thread U2 is fed out.

When one needle bar 110 is selected and sewing is performed by the sewing needle 11 provided on the needle bar 110, the two thread cutting sensors 161 and 162 detect the upper thread U1, U2) is a combination of the above-mentioned No. 1 to No. 4. For example, there are ten combinations of patterns as shown in the table of Fig. However, among these 10 patterns, no. 7 ~ No. 9 are used to detect the movement of the upper yarns U1 and U2 with respect to the detection of abnormality when the lower thread is wound around the bobbin by the yarn winding mechanism 19 instead of the sewing with the sewing needle 11, .

In the table of Fig. 1 to No. Fig. 1 "to" No. 4 ".

The two thread cutting sensors 161 and 162, which are combinations of movements of the upper thread U1 and U2 detected by the two thread cutting sensors 161 and 162, respectively, as shown in the table of Fig. 14, (Combination of signals), and the operating condition (abnormality detection) of the sewing machine which can be judged based on the combination.

For example, it is possible to detect that the normal sewing is performed by detecting the ON / OFF signal of the predetermined cycle by the first thread cutting sensor 161 and detecting the OFF signal by the second thread cutting sensor 162 (No 1) (usually sewing).

Further, when the first thread cutting sensor 161 detects the OFF signal and the second thread cutting sensor 162 detects the OFF signal, a sewing abnormality in which the sewing upper thread U1 is actually cut can be detected (No. 2) (thread cutting detection).

When the first thread cutting sensor 161 detects an ON / OFF signal at a predetermined cycle and the second thread cutting sensor 162 detects an ON / OFF signal at a predetermined cycle, the upper thread U2, which is not being sewn, (Upper thread U2 sewn on the sewing needle 12 in the stop state of operation) is sewn (No. 3) (detection of stitching of the sewing thread).

When the first thread cutting sensor 161 detects an ON / OFF signal of a predetermined cycle, and the second thread cutting sensor 162 detects an ON signal that continues or an ON / OFF signal that is not a predetermined cycle, The upper thread U2 wound on the thread take-up lever 141 can be detected (No. 4).

When the first thread cutting sensor 161 detects an ON signal or an ON / OFF signal that is not a predetermined cycle, and the second thread cutting sensor 162 detects an OFF signal, the upper thread U1 A sewing abnormality wound around the thread take-up device 141 can be detected (No. 5).

It is also possible to detect the ON signal or the ON / OFF signal that is not the predetermined ON period or the ON period of the second room cut sensor 161, The upper thread U1 being sewn and the upper thread U2 which is not being sewn together can be detected by sewing thread wound around the thread takeer 141 (No. 6).

When the first thread cutting sensor 161 detects the OFF signal and the second thread cutting sensor 162 detects the ON / OFF signal of the predetermined cycle, the upper thread U1 and the upper thread U2 are reversely stitched It is possible to detect a sewing abnormality (an error that the upper thread U1 is inserted through the sewing needle 12 and the upper thread U2 is inserted through the sewing needle 11) (No. 10) Detection of errors).

Although not shown in the table of Fig. 14, when a normal yarn winding operation is performed during the yarn winding operation of the lower thread by the yarn winder mechanism 19, the first yarn cut sensor 161 outputs an OFF signal And the second room cut sensor 162 detects the OFF signal.

When the first thread cutting sensor 161 detects an OFF signal and the second thread cutting sensor 162 continues to output an ON signal or an ON / OFF signal that is not a predetermined cycle in the yarn winding of the lower thread by the yarn winder mechanism 19, By detecting the OFF signal, it is possible to detect a sewing abnormality (No. 7) that the upper thread U2 is wound around the thread take-up 141.

Further, during the yarn winding operation of the lower thread by the yarn winder mechanism 19, the first yarn cut sensor 161 detects an ON signal that is continuous or an ON / OFF signal that is not a predetermined cycle, 162 detects an OFF signal, it is possible to detect a sewing abnormality in which the upper thread U1 is wound around the thread take-up 141 (No. 8).

Further, during the yarn winding operation of the lower thread by the yarn winder mechanism 19, the first yarn cut sensor 161 detects an ON signal that is continuous or an ON / OFF signal that is not a predetermined cycle, It is possible to detect a sewing abnormality in which both the upper and lower thread U1 and U2 are wound around the thread take-up 141 by detecting the ON signal and the ON / OFF signal that are not the predetermined cycle ).

The data (No. 2 to No. 10) relating to a plurality of sewing abnormality patterns, which is a combination of the detection signal of the first thread cutting sensor 161 and the detection signal of the second thread cutting sensor 162, (Refer to FIG. 14) for determining whether the operation state of the sewing machine 100 is abnormal or not is stored in the data memory 94 (see FIG. 14) And stored. Further, a similar table serving as a judgment criterion in the case of performing sewing by the sewing needle 12 provided in the other needle bar 120 is also stored in the data memory 94 and stored.

The CPU 91 of the control device 90 executes the sewing abnormality detection program stored in the ROM 92 so that the control device 90 (CPU 91) drives the two needle bars 110 and 120 And the movement of the upper chambers U1 and U2 detected by the two thread cutting sensors 161 and 162 as a control means for determining the operation state of the twin needle sewing machine 100. [

For example, the control means 90 refers to the table (see Fig. 14) stored in the data memory 94, and when the operation state of the sewing machine 100 coincides with one of the sewing abnormality patterns in the table , It is determined that the operation status of the sewing machine 100 is equal to or greater than sewing.

The control means for judging the operation status of the sewing machine 100 determines whether or not the sewing abnormality pattern selected through the operation panel 70 among the plurality of sewing abnormality patterns stored in the data memory 94 is the operation of the sewing machine 100 It is determined that the operating condition of the sewing machine 100 is sewing or more when the operating condition of the sewing machine 100 coincides with the set sewing abnormality pattern.

When the control means for judging the operation state of the sewing machine 100 determines that the operation state of the sewing machine 100 is equal to or greater than the sewing state, the control device 90 (CPU 91) stops the sewing machine motor 21, And executes a process for stopping the driving of the sewing machine 100. [

When the control means for determining the operation status of the sewing machine 100 determines that the operation status of the sewing machine 100 is the sewing or more and stops the sewing machine 100, the control device 90 (the CPU 91) , And the operation panel 70 is operated to display the operation status of the sewing machine 100. [

[Process of determining the operation state of the sewing machine]

Next, the operation state determination processing of the sewing machine 100 will be described with reference to the flowchart shown in Fig.

First, the abnormality detection setting is performed through the operation panel 70 (step S1).

For example, in the case of performing sewing by the sewing needle 11 provided in one needle bar 110, 2 to No. 6, No. (For example, 5 needles) for establishing the sewing abnormality is set. Further, in the case of actually winding the lower thread by the thread winding mechanism 19, the lower thread of Fig. 7 ~ No. 9 may be set so as to make the detection of abnormality (abnormality) effective. As described above, it is possible to individually set the abnormality detection according to the case of sewing with the sewing machine 100 and the case of performing the actual winding of the lower thread.

Then, sewing is performed by pressing the start switch of the operation panel 70 to start the sewing operation of the sewing machine 100 (step S2).

Then, the control device 90 (CPU 91) determines whether the needle bar being driven and selected by operation, setting, or sewing data (selected sewing needle data) is the left needle bar (one needle bar 110) (Step S3) and confirms the movement of the upper chambers U1 and U2 detected by the two thread cutting sensors 161 and 162 (step S4).

The control device 90 (the CPU 91) controls the driving states of the two needle bars 110 and 120 and the movement of the upper thread U1 and U2 detected by the two thread cutting sensors 161 and 162 (Step S5). The determination as to whether or not the sewing abnormality has been made is determined based on the combination of No. 2 to No. 4 of the table of Fig. 14 set in step S1, The sewing abnormality pattern corresponding to No. 6, No. 10 is determined.

When the control device 90 (CPU 91) detects a sewing abnormality (step S6; YES), the number of needles of the abnormality detection is incremented by 1 (step S7). Based on the signal of the control signal.

Next, the control device 90 (CPU 91) judges whether or not the number of needles of the abnormality detection has reached the number of needles (for example, 5 needles) set in step S1 (step S8).

When the control device 90 (CPU 91) determines that the number of needles of the abnormality detection has not reached the number of needles (5 needles) set in step S1 (step S8; NO), the process returns to step S3.

On the other hand, if the control device 90 (CPU 91) determines that the number of needles of the abnormality detection has reached the number of needles (5 needles) set in step S1 (step S8; YES), the control device 90 ) Stops the sewing machine motor 21 and urgently stops the sewing machine 100 in step S9. The control device 90 (CPU 91) For example, in the case of the sewing abnormality pattern No. 2, the display of the operation panel 70 displays an indication of "actual thread cutting detection of the upper thread of the left needle bar (sewing needle)".

If the control device 90 (CPU 91) does not detect the sewing abnormality (step S6; NO), the number of needles of the abnormality detection is reset to 0 (zero) (step S6) S10).

If the control device 90 (CPU 91) determines that the sewing of the predetermined sewing pattern has not been finished (step S11; NO), the process returns to step S3.

On the other hand, when the control device 90 (CPU 91) determines that the sewing of the predetermined sewing pattern is finished (step S11; Yes), the control device 90 (CPU 91) The sewing machine 100 is stopped normally (step S12), and the sewing operation is ended.

The operation state determination processing of the sewing machine can be changed in various ways.

For example, the number of needles for sewing abnormality may be set in advance as an initial value at the time of shipment, and when the operator newly sets the number of abnormality detecting needles, the setting is applied at the time of next sewing Also,

In the above embodiment, when the abnormality is detected in step S6, the number of abnormality detecting needles is counted in step S7, and it is judged whether or not the number of abnormality detecting needles is reached in step S8. Instead, when the abnormality is detected, the feed amount of at least one of the X-axis motor 83 and the Y-axis motor 84 for moving the holding frame 81 is counted to determine whether or not the abnormality detection feed amount has been reached Also, When the abnormality is detected, it is also possible to determine that the abnormality detection time has been reached when the time is measured and, for example, the abnormality has continued for 3 seconds or more. The number of abnormality detecting needles, abnormality detection feed amount, and abnormality detection time are collectively referred to as abnormality detection reference.

14 is a table that serves as a reference for determining whether or not the operation state of the sewing machine is sewing abnormality. In this table, when the movement of the upper thread in sewing is normal, the sensors 161 and 162 detect ON and OFF signals of a predetermined cycle. However, even if the response speed of the sensors 161 and 162 used is low or the sewing speed is high, even if the sewing upper thread moves normally, the sensors 161 and 162 are not ON / And detects an ON signal to be fed out or an ON / OFF signal that is not a predetermined period. As a result, in Fig. 1, No. 2, No. 3, No. 10 and No. 4 ~ No. There is a possibility that it can not be distinguished from 10.

In order to avoid such erroneous determination, it is also easy to use the operation situation reference table of the sewing machine shown in Fig. The operation condition reference table is composed of No 1, No 2, No 3, and No 10 only. The "ON or ON-OFF cycle" of the table means a state in which an ON signal, a ON / OFF signal of a predetermined cycle, and an ON / OFF signal that is not a predetermined cycle are detected. By using the operation status reference table of the sewing machine shown in Fig. 16, it is possible to more reliably determine the operation state of sewing or the like.

It is also conceivable to use one of the detection of the sewing of the stopper thread and the detection of the error in which the thread is threaded in the reverse direction as an operation state of sewing or the like.

The thread winder mechanism 19 is driven by the touch operation of the operation panel 70. [ Therefore, the control device 90 can receive the input signal from the operation panel and recognize that it is actually wound. From the signal indicating that the thread is wound, the table of Fig. 7, No. 8, No. 9 can be added so that the control device 90 can recognize the winding of the yarn with respect to the yarn winding machine in the yarn winding.

[Operation and effect of the embodiment]

The sewing machine (100) is a twin needle sewing machine (100) that performs sewing by a sewing needle provided in a selected needle bar, which is switched to either one of needle bar drives by operation or setting among two needle bars (110, 120) A first thread cutting sensor 161 for detecting the movement of the upper thread supplied to the sewing needles of one of the needle bars, a second thread cutting sensor 162 for detecting the movement of the upper thread supplied to the sewing needles of the other needle bar, And control means (90) for judging the operation state of the twin needle sewing machine based on a combination of the driving state of the two needle bars and the movement of the upper thread detected by the two sensors.

Further, the control means (90) stops the twin needle sewing machine when it is judged that the operation state of the twin needle sewing machine is sewing or more.

And a storage means 94 for storing a plurality of sewing abnormality patterns based on the combination of the driving states of the two needle bars and the movement of the upper thread detectable by the two sensors 161 and 162 , The control means (90) determines that the operation state of the twin needle sewing machine is sewing or more when the operation state of the twin needle sewing machine matches one of the sewing abnormality patterns stored in the storage means (94).

And setting means (90) for selecting and setting a sewing abnormality pattern to be used for judging the operation state of the twin needle sewing machine among the plurality of sewing abnormality patterns stored in the storage means, wherein the control means (90) And when the operation state of the sewing machine matches the sewing abnormality pattern set by the setting means (90), it is determined that the operation state of the twin needle sewing machine is sewing or more.

The sewing abnormality judged by the control means (90) is characterized in that it includes at least one of the sewing of the upper thread stitched on the sewing needle during the stop of operation and the error of the thread being reversely stitched.

Further, the present invention is characterized by a display section (70) for displaying the operation status of the twin needle sewing machine judged by the control means (90).

As described above, the sewing machine 100 not only performs the above-described detection related to the thread cutting as in the prior art but also detects the movement of the upper thread U1, U2 detected by the two thread cutting sensors 161, Various types of sewing abnormality can be detected based on the combination, so that various types of detection can be efficiently performed without adding a new sensor.

[Etc]

The above-mentioned needle bar switching mechanism 30 is not limited to an electronic cycle sewing machine, and may be applied to various sewing machines such as a so-called sewing machine. In the case of applying the present invention to the main sewing machine, it is preferable that the operator install input means (such as the operation panel 70) for instructing the control device 90 of the sewing machine to perform the switching of the needle beds 110 and 120.

The switching lever 332 of the stop selector 33 has a structure including the press-in projections 332b and 332c protruding outward in the radial direction. In the "switch of the used sewing needle" In order to prevent the pin-shaped portions 321a and 321a projected from the upper ends of the respective needle beds 110 and 120 from interfering with the press-fit projections 332b and 332c when the holding states of the needle beds 110 and 120 are switched, The turning lever 332 is rotated when the needle bar 110 or 120 in the state where the needle bar 110 or 120 is held at the upper stop position and then the upper barrel 22 is rotated reversely to return to the top dead center position The pin-shaped portion 321a is press-fitted.

Here, as shown in Fig. 17, even when the press-in projections 332b and 332c of the changeover lever 332 are connected by the tapered portion 332d whose diameter is gradually reduced to form the outer peripheral cam shape Do. This makes it possible to rotate the switching lever 332 without interfering with the pin-shaped portion 321a of the needle bar 110 or 120 held in the needle bar holder 25 and the press-in protrusion 332b or 332c.

Therefore, the sewing machine motor 21 is stopped at the needlepoint upper dead point, not at the upper stop position, and in this state, the thread cutting, the rotation of the needle base base 31, 332 to rotate the needle beds 110, 120 so that the sewing can be restarted as it is. That is, the reverse rotation operation of the sewing machine motor 21 becomes unnecessary, and the needle bar switching operation can be performed quickly.

[Other examples of seal holding device]

It should be noted that the yarn holding device 60A shown in Figs. 18 to 20 may be provided in the sewing machine 100 instead of the yarn holding device 60 shown in Fig.

The thread holding device 60A includes a movable holding member 61A fixedly mounted near the right side surface of the needle base base 31 and a movable holding member 61B fixed to the movable holding member 61A on both sides in the swinging direction of the needle base base 31 And a fixed holding member 62A having two opposed portions 621A and 622A facing each other.

The upper end of the movable holding member 61A is fixed to the right end of the front surface of the needle base base 31 by two screws. The lower end of the movable holding member 61A is formed with a thread retaining portion 611A which is bent toward the rear in the Y-axis direction. The seal holding portion 611A has a round bar shape along the Y axis direction.

The left and right side edge portions 611Aa and 611Ab on the outer peripheral surface of the seal holding portion 611A are opposed to the opposing portions 621A and 622A of the fixed holding member 62A, respectively.

The fixed holding member 62A is disposed near the right side of the needle base base 31. [ The two opposing portions 621A and 622A of the fixed holding member 62A are both in the form of a flat plate which is parallel to the Y axis direction and slightly inclined with respect to the Z axis direction and has a substantially inverted U shape And the upper portions of the two are integrally connected to each other. The fixed holding member 62A is fixed to the frame of the face portion 105 by the supporting portion 625A.

The connecting portion of the two opposing portions 621A and 622A has a semi-cylindrical shape and is threaded through the upper thread U1 of the sewing needle 11 through the connecting portion vertically. There is formed a threading hole 624A through which the threading hole 623A and the upper thread U2 of the sewing needle 12 are inserted.

The threading holes 623A and 624A are all formed in a slit shape along the X-axis direction. The threading hole 623A is formed in a range extending from the connecting portion of the opposing portions 621A and 622A to the opposing portion 621A and the threading hole 624A is formed in a region extending from the connecting portion of the opposing portions 621A and 622A To the portion 623A.

Thereby, the needle threading hole 623A has the upper thread U1 inserted through from the upper side into the first threaded hole U1 between the opposing portion 621A and the left side edge portion 611Aa on the outer peripheral surface of the seal holding portion 611A, The upper thread U2 inserted through the threading hole 624A from the upper side is guided to the threading unit through the threaded hole 624A from the opposite side 622A and the left side edge 611Ab on the outer peripheral surface of the thread holding unit 611A So that it can be guided to the second threading unit between the second threading unit.

Since the movable holding member 61A is provided on the needle base base 31 that oscillates and reciprocates along the X axis direction, when the sewing needle 11 is selected by the switching drive unit 34, the movement of the needle base base 31 The right side edge portion 611Ab of the seal holding portion 611A of the movable holding member 61A comes into contact with the opposing portion 622A side of the fixed holding member 62A when the lower end portion is pivoted to the right. As a result, the unused upper thread U2 of the sewing needle 12 is held in the state of being held by the sewing needle 12, so that the upper thread U2 is pulled out of the sewing needle 12 against the pulling action of the thread take- Can be prevented.

When the sewing needle 12 is selected by the switching drive unit 34, the lower end of the needle base base 31 pivots to the left, so that the one side edge of the thread holding portion 611A of the movable holding member 61A The portion 611Aa comes into contact with the one opposing portion 621A side of the fixed holding member 62A. As a result, unused upper thread U1 on sewing needle 11 side is held in the state of being held by them so that upper thread U1 can be pulled out of sewing needle 11 against pulling action of thread take- Can be prevented.

In the case of the thread holding device 60A, the entire device can be disposed on the right side of the needle base base 31, and the needle thread thread guide 36 provided in the vicinity of the sewing needles 11, 12 from the thread take- Since the upper thread U1 and U2 can be installed in the middle of the upper thread path, the upper thread U1 and U2 can be smoothly guided.

Further, the application of the present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the present invention.

21; Sewing machine motor
22; Decoration
25; Needle Holder
30; Needle bar switching mechanism
31; The base of the needle bar
32; Needle bar stop
33; Stop selector
34; The switching driver
70; Operation panel (setting means, display section)
90; Control device (control means, setting means)
91; CPU
92; ROM
93; REAM
94; The data memory (storage means)
100; Sewing machine
11, 12; Sewing needle
110, 120; Needle bar
14; Thread take-
161; First chamber cutting sensor
162; 2nd chamber cutting sensor
19; Thread winder mechanism
U1; Upper thread
U2; Upper thread

Claims (7)

A two-needle sewing machine, which is switched to one of the needle bar drives by operation or setting among two needle bars and performs sewing by a sewing needle provided in the selected needle bar,
A first thread cutting sensor for detecting the movement of the upper thread supplied to the sewing needles of one needle bar, a second thread cutting sensor for detecting the movement of the upper thread supplied to the sewing needles of the other needle bar,
Control means for determining an operation state of the twin needle sewing machine based on a combination of a driving state of the two needle bars and a movement of an upper thread detected by the first thread cutting sensor and the second thread cutting sensor,
And storage means for storing a plurality of sewing abnormality patterns based on a combination of the driving states of the two needle bars and the movement of the upper thread detectable by the first thread cutting sensor and the second thread cutting sensor ,
Characterized in that the control means judges that the operation state of the twin needle sewing machine is sewing abnormality when the operation state of the twin needle sewing machine matches one of the sewing abnormality patterns stored in the storage means . The method according to claim 1,
And setting means for selecting and setting a sewing abnormality pattern to be used for judging the operation state of the twin needle sewing machine among the plurality of sewing abnormality patterns stored in the storage means,
Wherein the control means determines that the operation state of the twin needle sewing machine is sewing or more when the operation state of the twin needle sewing machine matches the sewing abnormal pattern set by the setting means. 3. The method according to claim 1 or 2,
Wherein the control means stops the twin needle sewing machine when it is determined that the operation state of the twin needle sewing machine is equal to or greater than sewing. 3. The method according to claim 1 or 2,
Wherein the sewing abnormality judged by said control means includes at least one of an error that an upper thread stitched on a sewing needle in an operation stop state is stitched and an error in which the thread is stitched reversely. 5. The method of claim 4,
Wherein the control means stops the twin needle sewing machine when it is determined that the operation state of the twin needle sewing machine is equal to or greater than sewing. 5. The method of claim 4,
And a display unit for displaying an operation status of the twin needle sewing machine determined by the control unit. The method according to claim 6,
Wherein the control means stops the twin needle sewing machine when it is determined that the operation state of the twin needle sewing machine is equal to or greater than sewing.

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