JPH0860521A - Needle thread locker in multi-head type embroidery machine - Google Patents

Abstract

PURPOSE: To ensure a plurality of needle threads to be locked with the resting machine heads, when embroidering is operated with a plurality of machine heads. CONSTITUTION: In a multi-head type embroidering machine where the machine head 10 having a plurality of couples of needle bars equipped with sewing needles 16 through which needle threads passe, respectively, and balances picking up the needle threads in parallel over the table, a stationary plate 40 having the first thread-passing holes 48 which permit the needle threads after passing individual balances to pass through bored in the same number as the needle number and a slidable plate 50 having the second thread-passing holes 52 corresponding to the first holes bored are arranged so that the first holes and the second holes oppose to each other to permit each needle thread to pass through, when each head works for embroidering. In the meantime, when each head is at rest, the slidable plate 50 is made slide in the longitudinal direction to displace the second holes from the first holes so the needle threads may be held between these plates and thus locked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle lock device for a multi-head embroidery sewing machine, and more particularly to a multi-head embroidery sewing machine having a plurality of sewing machine heads arranged in parallel above a table. In the above, it is configured such that an arbitrary sewing machine head is paused among the plurality of sewing machine heads, and when the remaining sewing machine head embroiders the work cloth, the upper thread can be reliably locked by the sewing machine head during the suspension. The present invention relates to a thread locking device.

[0002]

2. Description of the Related Art As shown in FIG. 18, a multi-head embroidery sewing machine having a plurality of sewing machine heads 10 arranged in parallel above a table 12 is preferably used. Each sewing machine head 10 arranged in parallel in this multi-head embroidery sewing machine is shown in FIG.
As shown in FIG. 7, a needle bar 18 provided with a sewing needle 16 through which the needle thread 14 is inserted is provided at a lower end portion, and a balance 20 provided corresponding to the needle bar 18 for picking up the needle thread 14. A plurality of embroidery sewing portions 22 are arranged in parallel on the front surface of the head 10 (the embroidery sewing portion 2 in the illustrated example).
2 is provided 6). Then, the sewing machine heads 10 are correspondingly distributed to the work cloths placed on the table 12, and the embroidery sewing section 2 of each sewing machine head 10 is distributed.
By operating 2 in synchronism, the required embroidery is applied to the corresponding portion of the work cloth.

In this multi-head embroidery sewing machine, not all of the sewing machine heads 10 equipped with a plurality of machines are always operated.
Depending on the embroidery pattern to be formed on the work cloth, it is often the case that the operation of any sewing head 10 is stopped and the remaining sewing head 10 performs embroidery sewing. That is, when embroidering a work cloth with a multi-head embroidery sewing machine, all the sewing machine heads 10 are operated synchronously, and even-numbered heads 10 are stopped and odd-numbered heads 10 are used.
There is a case where the odd number heads 10 are made to rest and an even number head 10 is made to work, a case where any head 10 is made to pause at random and other heads 10 are made to operate. The sequence in which 10 is operated depends on the control data of the microcomputer programmed according to the embroidery pattern to be created.

As described above, when any sewing machine head 10 is stopped and the remaining sewing heads 10 are operated, the needle bars 18 are moved upward in the plurality of embroidery sewing portions 22 of the sewing machine head 10 during the stop. It is made to stand by in the state that it was made to jump to. However, even when the sewing machine head 10 is at rest, since the balance 20 swings up and down to pick up the upper thread 14, the needle bar 18
The upper thread 14 that has passed through the eyelet of the sewing needle 16 provided at the lower end of the needle may come off. In this way, in order to avoid the inconvenience that the needle thread 14 comes out from the eye hole of the sewing needle 16 due to the vertical swing of the balance 20 in the sewing machine head 10 at rest, the needle thread lock device is provided in a multi-head embroidery sewing machine. Proposals have been made.

That is, as shown in FIG. 17, an upper thread pressing portion 24 is fixed to a lower portion of the front surface of a sewing machine head 10 in a multi-head embroidery sewing machine, and rotating arms 26, 26 forming a pair are provided on both side surfaces of the head 10. A substantially middle portion is rotatably supported. A holding rod 28 is connected and fixed between the front ends of the rotating arms 26, 26, and an operating rod 30 is connected and fixed between the rear ends. This operating rod 30 is a motor 3
2 is connected to a swing mechanism having a driving source,
By rotating 6, 6 in the forward and reverse directions by a required angle, the pressing bar 28 can be pressed and released with respect to the upper thread pressing portion 24. Therefore, the balance 2
If the needle thread 14 from 0 to the sewing needle 16 of the needle bar 18 is made to pass between the needle thread pressing portion 24 and the pressing bar 28, the rotation arm 26,
When 26 rotates counterclockwise (in FIG. 17), the upper thread 14
Is locked between the presser bar 28 and the upper thread presser section 24. When the swinging mechanism is operated in reverse, the rotating arm 26,
26 rotates clockwise (in FIG. 17), and the lock of the needle thread 14 by the presser bar 28 is released.

[0006]

The needle thread locking device described above has a structure in which both ends of the presser bar 28 are fixed by the front ends of the rotating arms 26, 26.
There is a drawback that the force for pinching the upper thread 14 is uneven due to the upper thread pressing portion 24. That is, the presser bar 28 and the upper thread pressing portion 2
For example, six needle threads 14 are made to pass between 4 and 4, depending on the number of embroidery sewing portions 22, but the pressing force between the presser bar 28 and the needle thread pressing portion 24 becomes weaker near the center. The upper thread 14 located near the center may not be reliably locked. When the sewing machine head 10 is slid in order to select any needle bar 18, the motor 32
The connecting position between the swinging mechanism having the drive source as a source and the operating rod 30 changes. Then, the force with which the presser bar 28 presses the upper thread 14 may become stronger on one end side and weaker on the other end side of the presser bar 28. At this time, the weaker pressing force causes a drawback that the upper thread 14 cannot be reliably locked with respect to the upper thread pressing portion 24.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned drawbacks inherent in the needle thread locking device of a multi-head embroidery sewing machine according to the prior art. A needle thread that can lock all of the needle threads with the resting sewing machine head when the sewing machine head is paused and the work cloth is embroidered with the remaining sewing machine heads. An object is to provide a locking device.

[0008]

SUMMARY OF THE INVENTION In order to overcome the above problems and preferably achieve an intended purpose, a needle thread locking device according to the present invention has a needle bar having a lower end portion with a needle through which an upper thread is inserted. And a balance provided for the needle bar and for picking up the needle thread constitutes an embroidery sewing section, and a sewing machine head having a plurality of embroidery sewing sections arranged in parallel is arranged above the table. In a multi-head embroidery sewing machine configured to be arranged in parallel, it is arranged so as to cross the upper thread passage path of the sewing machine head and allow the upper thread to pass through the respective balances toward the sewing needle. A holding plate having a first insertion hole formed in the longitudinal direction by the number of the sewing needles, and a second plate that is superposed on the holding plate so as to be slidable in the longitudinal direction and individually corresponds to the plurality of first insertion holes. It consists of a slide plate with the same number of insertion holes in the longitudinal direction. At the time of embroidering sewing of individual sewing machine heads, the first insertion hole of the holding plate and the second insertion hole of the slide plate are correspondingly aligned to allow passage of each needle thread, and when sewing of individual sewing machine heads is stopped. , The slide plate is slidably moved in the longitudinal direction with respect to the holding plate to displace the first insertion hole and the second insertion hole, and the needle thread inserted into both insertion holes is moved between the holding plate and the slide plate. It is characterized in that the movement of the upper thread is locked by being clamped by.

Similarly, in order to overcome the above problems and preferably achieve the intended purpose, an upper thread locking device according to another invention of the present application includes a needle bar having a sewing needle through which an upper thread is inserted, at a lower end portion thereof,
An embroidery sewing section is constituted by a balance provided corresponding to the needle bar for picking up the upper thread, and a sewing machine head having a plurality of embroidery sewing sections arranged in parallel is arranged above the table. In a multi-head embroidery sewing machine configured to be arranged in plural, an insertion hole which is arranged so as to cross the upper thread passing path of the sewing machine head and allows the upper thread to pass through the respective balances toward the sewing needle. A holding plate formed in the longitudinal direction by the number of the sewing needles and a long hole which is superposed on the holding plate so as to be slidable in the front-rear direction and which can accommodate all of the insertion holes in the longitudinal direction. When the individual sewing heads are embroidered, the insertion holes of the holding plate and the long holes of the sliding plate are aligned correspondingly to allow passage of the respective upper threads, and the individual sewing heads. When the sewing of the The plate is slidably moved in the front-rear direction to displace the insertion hole and the elongated hole, and the needle thread inserted into the insertion hole and the elongated hole is clamped by the holding plate and the slide plate. The feature is that the movement of the upper thread is locked.

In order to overcome the above-mentioned problems and preferably achieve the intended purpose, a needle thread locking device according to still another invention of the present application is a needle bar having a sewing needle through which the needle thread is inserted, at a lower end portion thereof. , A sewing machine head, which is provided corresponding to the needle bar and which picks up the upper thread, constitutes an embroidery sewing section, and a sewing machine head having a plurality of the embroidery sewing sections arranged in parallel is arranged above the table. In a multi-head embroidery sewing machine configured to be arranged in plural, a length that is arranged so as to cross the upper thread passing path of the sewing machine head and allows the upper thread to pass through the respective balances toward the sewing needle. A holding plate having a long hole formed in the longitudinal direction and a holding plate that is slidably stacked in the front-rear direction on the holding plate, and has insertion holes corresponding to the long holes formed in the longitudinal direction by the number of the sewing needles. When embroidering individual sewing machine heads, consisting of a slide plate It includes a plurality of insertion holes of the long hole and the slide plate of the holding plate so as to correspond to the aligned permit passage of the upper thread, at the time of sewing rest of the individual machine heads,
The slide plate is slidably moved in the front-rear direction with respect to the holding plate to displace the long hole and the plurality of insertion holes in the front-rear direction, and the needle thread inserted in the long hole and the insertion hole is held by the holding member. It is characterized in that the movement of the needle thread is locked by being sandwiched between the plate and the slide plate.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a needle thread locking device for a multi-head embroidery sewing machine according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments. 1 to 6 show a first example of the present application.
Shows an embodiment of the needle thread lock device according to the invention. FIG. 1 shows a sewing machine head 1 in a multi-head embroidery sewing machine.
6 is a front view of the sewing machine head 10. Six slits 11 are formed laterally in the upper front portion of the sewing machine head 10 at required intervals, and the balance 20 extends from each slit 11 swingably. Further, the sewing machine head 10 is provided with the six balances 2
The number of needle bars 18 corresponding to 0 is arranged so as to be able to move up and down, and the sewing needles 16 are fixed to the lower ends of the needle bars 18. Further, a middle thread path 13 is horizontally arranged on the front surface of the sewing machine head 10 and below the balance 20, and the upper thread 14 drawn from an unillustrated upper thread supply source passes through the intermediate thread path 13 and then the balance 20
And then extends downward to be inserted into the eye hole of the sewing needle 16.

Below the sewing machine head 10 and the upper thread 1
A holding plate 40 made of an L-shaped angle member is horizontally arranged at a portion intersecting with a path through which the 4 passes, and both ends of the holding plate 40 are fixed to the sewing machine head 10 by fixing bolts 46, 46. As shown in FIG. 2, the holding plate 40 has a vertical wall surface 42 fixed to the sewing machine head 10 and a horizontal holding surface 44 extending at a right angle from the vertical wall surface 42. On the horizontal holding surface 44 of the holding plate 40, first insertion holes 48 corresponding to the number of the balances 20 are bored at required intervals in the longitudinal direction, and the upper thread 14 corresponds to each first insertion hole 48. Are inserted (the number of the first insertion holes 48 provided is 6 in the embodiment). As is clear from FIG. 2, a slide plate 50 made of a long plate member is superposed on the horizontal holding surface 44 of the holding plate 40 from above and slidable in the longitudinal direction with respect to the holding plate 40. ing.

That is, the slide plate 50 has correspondingly the same number of second insertion holes 52 as the first insertion holes 48, and has lever portions 70, 70 bent downward at both ends thereof. Long holes 54, 54 are formed in the longitudinal direction near both ends thereof. Then, the guide pins 5 are provided in the respective long holes 54.
6 and the guide pin 56 is screwed into the horizontal holding surface 44 of the holding plate 40, whereby the slide plate 5
0 is attached to the holding plate 40 so as not to fall off and to be movable in the longitudinal direction. In this case, a compression spring 58 is interposed between the guide pin 56 and the slide plate 50, and the elastic force of the spring 58 holds the slide plate 50 in the holding plate 4.
The horizontal holding surface 44 of 0 can be slidably pressed. The six first insertion holes 4 formed in the horizontal holding surface 44
8 and the same six second insertion holes 52 formed in the slide plate 50 slidably stacked on the horizontal holding surface 44, the slide plate 50 is moved rightward as shown in FIG. When the slide plates 50 are slid to the maximum extent, the corresponding second insertion holes 52 and the corresponding first insertion holes 48 are aligned, and as shown in FIG. 4, when the slide plate 50 is slid to the left side to the maximum extent. The corresponding second insertion hole 52 and the corresponding first insertion hole 48 are set to be completely displaced so that the aligned state can be released.

Further, as shown in FIGS. 5 and 6, a plate-shaped rubber magnet 60 is fixed to the holding plate 40 or the slide plate 50, and the slide plate 50 and the holding plate 40 are opposed to each other by the plate-shaped rubber magnet 60. It is configured to be magnetically attracted. That is, the slide plate 50 is slidably pressed against the horizontal holding surface 44 by the pressure of the spring 58 interposed in the guide pin 56, but with this alone, the pressure contact force is generated only in the vicinity of both ends where the spring 58 exists. There are fears that do not work. Therefore, as shown in FIG. 2, for example, a long plate-shaped rubber magnet 6 having six through holes 61 is formed in conformity with the drilling pattern of the first insertion holes 48 formed in the horizontal holding surface 44.
0 is prepared, and the plate-shaped rubber magnet 60 is fixed to the surface of the horizontal holding surface 44 or the back surface of the slide plate 50. In this way, the plate-shaped rubber magnet 6 is provided between the holding plate 40 and the slide plate 50.
By interposing 0, both plates 40 and 50 are magnetically attracted, and uniform pressing force is obtained over the entire area in the longitudinal direction. In the illustrated example, the plate-shaped rubber magnet 60 is adhered to the back surface of the slide plate 50 so that the through hole 61 is aligned with the second insertion hole 52.

Next, the operation of the needle thread locking device according to the above-mentioned first invention will be described. In the operating state of the sewing machine head 10, the second insertion hole 52 formed in the slide plate 50.
Further, the first insertion holes 48 formed in the horizontal holding surface 44 are always arranged in a corresponding manner as shown in FIGS. 3 and 5. The upper thread 14 drawn from a supply source (not shown) passes through the intermediate thread path 13 as shown in FIG.
The second part of the slide plate 50 that extends downward after being inserted into
After being inserted into the insertion hole 52 and the first insertion hole 48 of the horizontal holding surface 44, it is inserted into the eye hole of the sewing needle 16. If each sewing machine head 10 of the multi-head embroidery sewing machine is operated in this state,
The required embroidery is applied to a work cloth (not shown).

However, when it is desired to suspend the operation of the particular sewing machine head 10 and lock the needle thread 14 in the head 10, as shown in FIG. The second insertion hole 52 and the first insertion hole 48 which have been aligned up to this are displaced. As a result, the upper thread 14 is clamped by the plate-shaped rubber magnet 60 attached to the back surface of the slide plate 50 and the horizontal holding surface 44 of the holding plate 40, as shown in FIG. 6, so that the upper thread 14 is locked. It
At this time, the slide plate 50 is elastically pressed against the horizontal holding surface 44 by the spring 58 provided on the guide pin 56, and the plate-shaped rubber magnet 6 interposed between the sliding plate 50 and the horizontal holding surface 44.
With a magnetic force of 0, the magnetic force is evenly adsorbed along the longitudinal direction of the horizontal holding surface 44. Therefore, the respective upper threads 14 are securely locked at a constant pressure at any position between the slide plate 50 and the horizontal holding surface 44. It is recommended to use an actuator to be described later as a drive source for sliding the slide plate 50 in the lateral direction. However, even if a mechanism having another configuration is adopted, manual operation should be performed if necessary. May be.

7 and 8 show a preferred embodiment of the needle thread locking device according to the second invention of the present application. The basic structure is the same as that shown in FIG. 2, but the slide plate 50 is not elastically pressed toward the horizontal holding surface 44 of the holding plate 40, but is separated from the horizontal holding surface 44. It is different in that it is elastically biased in the direction. That is, the slide plate 50 is attached to the horizontal holding surface 4
The guide pin 56, which holds the guide pin 4 in a manner that prevents
As shown in FIG. 5, a spacer 62 having a required thickness is interposed to secure a required gap between the slide plate 50 and the horizontal holding surface 44. Further, an elastic plate member 64 having a slightly larger thickness than the spacer 62 is fixed on the back surface of the slide plate 50 and at a position avoiding the drilling position of each of the second insertion holes 52, and the elastic plate member 64 is attached to the slide plate 50. And the horizontal holding surface 44 are elastically pressed in the separating direction. As the elastic plate member 64, for example, a synthetic rubber type rectangular plate or a sponge type rectangular plate, and a material having durability against sliding friction is selected and used.

Also in the case of the second embodiment of the present invention, as shown in FIG. 8, the slide plate 50 is slid to the left with respect to the horizontal holding surface 44, and the second insertion holes 52 and The first insertion hole 48 is displaced. As a result, both insertion holes 5
The upper thread 14 that has been inserted through the yarns 2, 48 is reliably sandwiched by the horizontal holding surface 44 and the elastic plate member 64, and as a result, the upper thread 14 is locked. Also in this case, since the elastic plate member 64 elastically acts on the horizontal holding surface 44 with respect to each needle thread 14, at any position between the slide plate 50 and the horizontal holding surface 44, The needle thread 14 is securely locked with a constant pressure.

In the first and second inventions according to the illustrated example, the slide plate 50 is configured to slide in the longitudinal direction with respect to the holding plate 40.
May be slid in the front-back direction with respect to the holding plate 40. The needle thread locking device of the multi-head embroidery sewing machine shown in FIGS. 9, 10 and 11 below employs a configuration in which the slide plate 50 slides in the front-rear direction with respect to the holding plate 40. First, FIG. 9 shows an embodiment according to the third invention of the present application. In the holding plate 40, insertion holes 15 are formed in the longitudinal direction at the required intervals by the number of the sewing needles 16, and the individual insertion holes 15 are formed. The upper thread 14 is inserted through the balance 20 toward the sewing needle 16. A slide plate 50 is superposed on the holding plate 40 so as to be slidable in the front-rear direction. The slide plate 50 is provided with a long hole 17 corresponding to all of the insertion holes 15 of the holding plate 40 in the longitudinal direction, and the needle thread 14 is inserted into the long hole 17. ing. When the individual sewing heads 10 are sewn by embroidery, the insertion holes 15 of the holding plate 40 and the long holes 17 of the slide plate 50 are correspondingly aligned and the upper thread 14
Allow the passage of. Further, when the sewing of the individual sewing machine head 10 is stopped, the slide plate 50 is slidably moved in the front-rear direction with respect to the holding plate 40, so that the insertion hole 15 and the long hole 1 are formed.
7 and 7 are displaced. The movement of the upper thread 14 can be locked by sandwiching the upper thread 14 inserted through the insertion hole 15 and the elongated hole 17 between the holding plate 40 and the slide plate 50. Also in this case, by fixing the long plate-shaped rubber magnet 60 having the required number of through holes 61 formed on the horizontal holding surface 44 of the holding plate 40, the length of the holding plate 40 and the slide plate 50 can be increased. A uniform pressing force can be obtained over the entire area in the direction.

FIG. 10 shows an embodiment according to the fourth invention of the present application, which is basically the reverse of the configuration of FIG. That is, the holding plate 40 is attached to the sewing needle 16 via each balance 20.
A long hole 19 is formed in the longitudinal direction to allow the needle thread 14 to be directed toward. The slide plate 50, which is slidably overlapped with the holding plate 40 in the front-rear direction, has insertion holes 21 corresponding to the elongated holes 19 at the required intervals in the longitudinal direction by the number of the sewing needles 16. It is set up. When the individual sewing head 10 is embroidered, the holding plate 4 is used.
The long hole 19 of 0 and the plurality of insertion holes 21 of the slide plate 50 are correspondingly aligned to allow passage of each needle thread 14.
Further, when the sewing of the individual sewing machine head 10 is stopped, the slide plate 50 is slidably moved in the front-rear direction with respect to the holding plate 40 to displace the elongated hole 19 and the plurality of insertion holes 21 in the front-rear direction. Then, the movement of the upper thread 14 can be locked by sandwiching the upper thread 14 inserted through the long hole 19 and the insertion hole 21 between the holding plate 40 and the slide plate 50. The holding plate 40 and the slide plate 50 are fixed to the back surface of the slide plate 50 by fixing a plate-shaped rubber magnet 60 having a required number of through holes 61.
A uniform pressing force can be obtained over the entire area in the longitudinal direction.

FIG. 11 (A) shows an embodiment according to the fifth invention of the present application, in which the holding plate 40 is arranged on the sewing machine head 10 so as to face the needle thread passing path thereof. ing. A slide plate 50 is superposed on the holding plate 40 so as to be slidable in the front-rear direction. The horizontal holding surface 44 of the holding plate 40 is formed with a bay entry portion 45 extending in the longitudinal direction, and the upper thread 14 which passes through each balance 20 and goes toward the sewing needle 16 is inserted between the bay entry portion 45 and the slide plate 50. I am allowed to do it. That is, at the time of embroidery sewing of the individual sewing machine heads 10, as shown in (a) of FIG. 11 (B), each needle thread 14 freely passes between the bay entry portion 45 of the holding plate 40 and the slide plate 50. Is ready to go. When sewing of the individual sewing machine head 10 is stopped,
As shown in (B) and (b), the slide plate 50 is slidably moved rearward with respect to the holding plate 40, and the upper thread 14 is held between the holding plate 40 and the slide plate 50. The upper thread 1
4 movements can be locked. Also in this case, for example, by fixing the long plate-shaped rubber magnet 60 to the back surface of the slide plate 50, the holding plate 40 and the slide plate 50 can be fixed.
A uniform pressing force can be obtained over the entire area in the longitudinal direction.

Next, a mechanism for sliding the slide plate 50 of the needle thread lock device according to the present invention laterally with respect to the horizontal holding surface 44 of the holding plate 40 will be described. 12 and 1
3, the right end of the slide plate 50 is bent downward to form a bent piece 70. A guide shaft 76 is horizontally fixed inside the bent piece 70, and the guide shaft 76 is loosely inserted in a guide groove 74 of a tongue piece 72 formed by bending the right end portion of the horizontal holding surface 44 downward. ing.
Further, the compression spring 78 externally fitted to the guide shaft 76 is elastically positioned between the bending piece 70 and the tongue piece 72, and the slide plate 50 is always in the operating position shown in FIG. First of the second insertion hole 52 and the horizontal holding surface 44
It is held at a position aligned with the insertion hole 48. As shown in FIG. 14, a block body 80 is attached to the outside of the bending piece 70, and an inclined cam surface 82 formed in the longitudinal direction on the outer side surface of the block body 80 is directed obliquely to the rear right. The block body 80 holds the slide plate 50 against the elastic force of the spring 78 by the wedge action that occurs when the inclined cam surface 90 of the cam body 88, which will be described later, is forcibly brought into contact with the inclined cam surface 82. It is slidably moved with respect to the plate 40.

Further, as shown in FIG. 14, a long drive shaft 86 is attached to a support piece 84 arranged so as to hang down from the horizontal holding surface 44.
Is inserted horizontally, and the cam body 8 is inserted into an appropriate portion of the drive shaft 86.
8 is fixed. That is, the cam body 88 is formed in a fan shape as a whole, extends in the radial direction from the drive shaft 86, and faces the position below the block body 80. The cam body 88 is the inclined cam surface 8 of the block body 80.
The inclined cam surface 90 is formed on the surface on the side directed to 2, and the inclined cam surface 90 contacts the inclined cam surface 82 by rotating the drive shaft 86 in the direction of the arrow in FIG. It plays. The drive shaft 86 is commonly provided to all the sewing machine heads 10 in the multi-head embroidery sewing machine, and therefore the cam bodies 88 are also provided individually corresponding to the sewing machine heads 10. The drive shaft 86 is connected at one end thereof to a rotation mechanism (not shown) and is rotated as shown in FIG. 16, for example.

That is, in FIG. 14, the cam body 88 stands by at a lower position slightly separated from the block body 80, and the inclined cam surface 90 of the cam body 88 is directed to the inclined cam surface 82 of the block body 80. . Then, the rotation mechanism (not shown) is urged to move the drive shaft 86 counterclockwise (direction of arrow).
When it is turned to, the inclined cam surface 90 of the cam body 88 comes into contact with the inclined cam surface 82 of the block body 80. When the cam body 88 further rotates, both inclined cam surfaces 90, 8
The slide plate 50 to which the block body 80 is fixed is compressed by the compression spring 78 by the wedge effect generated between the two.
It will slide to the left against the elasticity of. That is, as shown in FIG. 13, since the slide plate 50 is displaced with respect to the horizontal holding surface 44 of the holding plate 40, the second insertion hole 52 and the first insertion hole 48, which have been in the alignment relationship until then, are also displaced, and
The upper thread 14 will be locked as described above. When the drive mechanism 86 shown in FIG. 14 is rotated clockwise by reversely urging the rotation mechanism, the inclined cam surface 90 of the cam body 88 is separated from the inclined cam surface 82 of the block body 80 and pushed. Relieve pressure. Therefore, due to the return elasticity of the compression spring 78, the slide plate 50 slides to the right with respect to the horizontal holding surface 44 of the holding plate 40 and returns to the aligned state shown in FIG. 5 again.

Since the multi-head embroidery sewing machine described above has a plurality of sewing machine heads 10 arranged in parallel,
The respective sewing machine heads 10 have basically the same configuration. As described above, the drive shaft 86 is commonly provided to all the sewing machine heads 10 of the multi-head embroidery sewing machine, and the cam body 88 is also provided correspondingly to each sewing machine head 10. Therefore, as shown in FIGS. 15A and 15B, the arrangement angle of the cam body 88 in the odd-numbered sewing head 10 and the arrangement angle of the cam body 88 in the even-numbered sewing head 10 are changed in a fixed relationship. By letting me
Even-numbered sewing head 10 and odd-numbered sewing head 10
It is possible to individually control the locked state of each needle thread 14 in.

That is, in FIGS. 15A and 15B,
The cam bodies 88 are all separated from the block body 80.
For example, FIG. 15A shows the cam body 88 of the odd-numbered sewing machine head 10 in a state where the cam body 88 is farthest from the block body 80. 15B, the cam body 88 of the even-numbered sewing head 10 is replaced with the block body 80.
Is shown in the most separated state. However, in FIG.
The cam body 88 shown in FIG. 15B is farther away from the corresponding block body 80 than the cam body 88 shown in FIG. The upper thread 14 is not locked in both the even-numbered sewing head 10 and the odd-numbered sewing head 10.

Next, FIG. 16A corresponds to FIG. 15A, and FIG. 16B corresponds to FIG. 15B. As shown in (A) of FIG. 16, when the cam body 88 is rotated from the position shown in (A) of FIG. 15 to the solid line position, the above-described state of FIG. 13 is formed and the upper thread 14
Is locked. At this time, in FIG. 16 (B), the cam body 88 rotates from the position shown in FIG. 15 (B) to the solid line position, but since it has not come into contact with the block body 80, the needle thread 14 is still locked. Not not.

When the cam body 88 is rotated from the position indicated by the solid line in FIG. 16 to the position indicated by the alternate long and short dash line, the odd head 10 shown in FIG.
The upper thread 14 continues to be locked. In the even-numbered head 10 of FIG. 16B, the cam body 88 rotates to the position indicated by the alternate long and short dash line, whereby the above-described state of FIG. 13 is formed and the needle thread 14 is locked. Next, when the cam body 88 is rotated from the one-dot chain line position in FIG. 16 to the two-dot chain line position, the odd head 10 in FIG. 16A is disengaged from the block body 80 and the lock of the needle thread 14 is released. Also in FIG.
In the even head 10 of (B), the cam body 88 is the block body 8
Since the state of contacting 0 continues, the needle thread 14 is continuously locked. In this way, the positional relationship between the cam body 88 and the block body 80 provided in each sewing machine head 10 is changed, and the common drive shaft 86 is rotated by a required angle, whereby the odd-numbered sewing head 10 and the even sewing head 10 are evenly rotated. It is possible to preferably control the locked state and the unlocked state of the upper thread 14 with the sewing machine head 10. That is, since the upper thread 14 can be individually locked for the odd-numbered sewing head 10 and the even-numbered sewing head 10, for example, the odd-numbered sewing head 10 performs embroidery and the even-numbered sewing head 10 suspends its operation. The upper thread 14 can be locked by conversely, and on the contrary, the even number sewing head 10 can perform embroidery, and the odd number sewing head 10 can suspend its operation to lock the upper thread 14.

[0029]

As described above, according to the needle thread lock device of the multi-head embroidery sewing machine according to the present invention, the slide plate and the holding plate provided on the sewing machine head are uniformly pressed or separated in the longitudinal direction thereof. As a result, the respective upper threads can be locked evenly and uniformly.

[Brief description of drawings]

FIG. 1 is a front view of a sewing machine head provided with a needle thread locking device according to an embodiment of the first invention.

FIG. 2 is a perspective view showing a schematic configuration of a needle thread lock device according to an embodiment of the first invention in an exploded state.

FIG. 3 is a partially cutaway front view showing a state in which the sewing machine head is operated to perform embroidery in the needle thread locking device shown in FIG. 1.

FIG. 4 is a partially cutaway front view of the needle thread lock device shown in FIG. 1, showing a sewing machine head in a rest state.

FIG. 5 is an enlarged view showing a state in which two through holes are aligned in the needle thread locking device according to FIG.

FIG. 6 is an enlarged view of the needle thread locking device according to FIG. 3 in which the aligned state of the two through holes is released.

FIG. 7 is a front view showing a schematic configuration of a needle thread lock device according to a second invention of the present application, showing two through holes in alignment.

FIG. 8 is a front view showing a schematic configuration of a needle thread lock device according to a second invention of the present application, showing a state in which two through holes are displaced.

FIG. 9 is a schematic perspective view of a needle thread lock device according to a third invention of the present application.

FIG. 10 is a schematic perspective view of a needle thread lock device according to a fourth invention of the present application.

FIG. 11 is an explanatory view showing a needle thread locking device according to a fifth invention of the present application in a schematic perspective state and a schematic plane state.

FIG. 12 is a front view showing a schematic configuration of a mechanism for slidingly moving the slide plate in the lateral direction in the needle thread lock device according to the present invention, and is shown in a state before the slide plate is slid.

FIG. 13 is a front view showing a schematic configuration of a mechanism for slidingly moving the slide plate in the horizontal direction in the needle thread lock device according to the present invention, and is shown in a state after the slide plate is slid.

14 is a partially enlarged perspective view schematically showing details of a mechanism for slidingly moving the slide plate shown in FIG. 12 in a lateral direction.

FIG. 15 is a side view showing a state in which the mechanism shown in FIG. 14 is arranged with different angles between the odd-numbered side sewing head and the even-numbered sewing head.

16 is a schematic side view showing a state in which the mechanism shown in FIG. 15 is operated while changing the angles thereof.

FIG. 17 is a perspective view showing a schematic configuration of a needle thread lock device according to a conventional technique.

FIG. 18 is a perspective view showing a schematic configuration of a multi-head embroidery sewing machine according to a conventional technique.

[Explanation of symbols]

 10 sewing machine head 12 table 14 needle thread 15 insertion hole 16 sewing needle 17 long hole 18 needle bar 20 balance 21 insertion hole 22 embroidery sewing part 40 holding plate 48 first insertion hole 50 slide plate 52 second insertion hole 54 long hole 56 guide Pin 58 Spring 60 Plate-shaped rubber magnet 62 Spacer 64 Elastic plate material 78 Elastic member 80 Block body 82 Inclined cam surface 86 Drive shaft 88 Cam body 90 Inclined cam surface

Claims (7)

[Claims] 1. A needle bar (18) having a sewing needle (16) at a lower end thereof, through which an upper thread (14) is inserted, and picking up of the upper thread (14) provided corresponding to the needle bar (18). Doing the balance (20) and embroidery sewing part (22)
And a multi-head embroidery sewing machine in which a plurality of sewing machine heads (10) having a plurality of embroidery sewing parts (22) arranged in parallel are arranged in parallel above a table (12). In the above, the first insertion which is arranged so as to cross the upper thread passage of the sewing machine head (10) and allows the upper thread (14) to pass through the respective balances (20) toward the sewing needle (16). Make a hole (48) through the sewing needle (1
6) Holding plates (40) drilled in the longitudinal direction by the number of 6) are superposed on the holding plates (40) so as to be slidable in the longitudinal direction, and individually correspond to the plurality of first insertion holes (48). Slide plate (5) having the same number of second insertion holes (52)
0) and the holding plate when sewing the individual sewing head (10)
The first insertion hole (48) of (40) and the second insertion hole (5 of the slide plate (50)
2) are aligned with each other to allow passage of the respective upper threads (14), and when the sewing of the individual sewing machine head (10) is stopped, the holding plate
The slide plate (50) is slidably moved in the longitudinal direction with respect to (40) to displace the first insertion hole (48) and the second insertion hole (52), and both insertion holes (48, 52). Insert the needle thread (14) inserted in the
By sandwiching it with the (40) and the slide plate (50), the upper thread (1
4) A needle lock device for a multi-head embroidery sewing machine, characterized in that the movement of (4) is locked. 2. A guide pin having a long hole (54) formed in the slide plate (50) along the sliding direction and loosely inserted in the long hole (54).
(56) is fixed to the holding plate (40) and the guide pin
The spring (58) is interposed between the (56) and the slide plate (50) so that the slide plate (50) is slidably pressed against the holding plate (40). Needle lock device for multi-head embroidery sewing machine. 3. A plate-shaped rubber magnet (60) is fixed to the holding plate (40) or the slide plate (50), and the slide plate (50) and the holding plate (40) are fixed by the plate-shaped rubber magnet (60). The upper thread locking device for a multi-head embroidery sewing machine according to claim 1, wherein said and said are magnetically attracted to each other. 4. Spacers (62) are provided on both ends of the holding plate (40).
To secure a required gap between the holding plate (40) and the slide plate (50), and an elastic plate material (64) having a larger thickness than the spacer (62) is interposed in this gap, The slide plate
The needle thread locking device for a multi-head embroidery sewing machine according to claim 1, wherein the elastic force is applied in a direction of separating the (50) from the holding plate (40). 5. A needle bar (18) having a sewing needle (16) at the lower end thereof, through which the needle thread (14) is inserted, and the needle thread (14) provided corresponding to the needle bar (18) Doing the balance (20) and embroidery sewing part (22)
And a multi-head embroidery sewing machine in which a plurality of sewing machine heads (10) having a plurality of embroidery sewing parts (22) arranged in parallel are arranged in parallel above a table (12). In, in the sewing machine head (10) is arranged so as to intersect with the upper thread passing path, and the upper thread (14) is inserted through the respective balances (20) toward the sewing needle (16). 15), a holding plate (40) formed in the longitudinal direction by the number of the sewing needles (16), and the holding plate (40) is superposed on the holding plate (40) so as to be slidable in the front-back direction, and the insertion hole (15) It consists of a slide plate (50) with a long hole (17) that can accommodate all of them in the longitudinal direction, and when the sewing machine head (10) is sewn by embroidery, the holding plate is used.
The insertion hole (15) of (40) and the long hole (17) of the slide plate (50) are aligned correspondingly to allow passage of each needle thread (14), and the sewing machine head (10) When the sewing is stopped, the holding plate
The slide plate (50) is slidably moved in the front-rear direction with respect to (40) to displace the insertion hole (15) and the long hole (17), and these insertion hole (15) and long hole ( A multi-head type characterized in that the movement of the upper thread (14) is locked by sandwiching the upper thread (14) inserted in the (17) between the holding plate (40) and the slide plate (50). Top thread locking device for embroidery sewing machines. 6. A needle bar (18) having a sewing needle (16) at the lower end thereof, through which the upper thread (14) is inserted, and picking up of the upper thread (14) provided corresponding to the needle bar (18). Doing the balance (20) and embroidery sewing part (22)
And a multi-head embroidery sewing machine in which a plurality of sewing machine heads (10) having a plurality of embroidery sewing parts (22) arranged in parallel are arranged in parallel above a table (12). In the above, a long hole which is arranged so as to cross the upper thread passage of the sewing machine head (10) and allows the upper thread (14) to pass through the respective balances (20) toward the sewing needle (16). A holding plate (40) having a hole (17) formed in the longitudinal direction, and an insertion hole (21) which is slidably overlapped on the holding plate (40) in the front-rear direction and which can correspond to the elongated hole (17). ) The sewing needle
(16) slide plates (50) formed in the longitudinal direction by the number of (16), and when the individual sewing heads (10) are sewn with embroidery, the holding plate is used.
Long hole (17) of (40) and multiple insertion holes (21) of slide plate (50)
To allow the passage of the respective upper threads (14), and when the sewing of the individual sewing machine head (10) is stopped, the holding plate
The slide plate (50) is slidably moved in the front-rear direction with respect to the (40) to displace the long hole (17) and the plurality of insertion holes (21) in the front-rear direction. ) And the upper thread (14) inserted through the insertion hole (21) is clamped between the holding plate (40) and the slide plate (50) so that the movement of the upper thread (14) is locked. Characteristic multi-head embroidery machine needle thread lock device. 7. A block body (80) provided at one end of a slide plate (50) and a cam body (88) provided on a drive shaft (86) commonly provided to each sewing machine head (10). And the slide plate (50)
The sliding biasing mechanism is composed of an elastic member (78) that constantly biases the sliding biasing mechanism (80, 88, 78) to the original position.
By rotating the drive shaft (86) at a required angle, the inclined cam surface (90) formed on the cam body (88) is forced to the inclined cam surface (82) formed on the block body (80). The slide plate (50) is slidably moved against the elastic force of the elastic member (78) by abutting the wedge members between the inclined cam surfaces (90, 82). 6. The needle thread lock device according to any one of 6 above.