JPH11226285A - Positional adjustment device of rotary shuttle of multi-needle sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve an inconvenience that a positional adjustment work of a rotary shuttle is very troublesome because a user has to manually rotate an eccentric pin by use of a tool or the like and has to shift the rotary shuttle to the axial direction thereof to adjust the position, in the positional adjustment device of the rotary shuttle of conventional multi-needle sewing machines. SOLUTION: The driving of a stepping motor 82 is controlled so that a rotary shuttle 25 is driven to transfer forward or rearward by a rotary shuttle driving structure 27 including the stepping motor 82 and an eccentric pin structure 83 and further, the rotary shuttle 25 is transferred to a base position where the gap between a sewing needle of a needlebar located at a sewable position and the point of the rotary shuttle forms a set gap whenever the needle bar is changed over by a changeover structure of the needlebar.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary hook position adjusting device for a multi-needle sewing machine, and more particularly, to a rotary hook position adjusting device provided with a rotary hook driving mechanism including an actuator for driving the rotary hook in the hook axial direction. .

[0002]

2. Description of the Related Art Conventionally, a multi-needle sewing machine that sews a colorful embroidery pattern with a plurality of needle threads (embroidery threads) includes a plurality of vertical needle bars housed in a needle bar case and a needle bar case. A needle bar drive mechanism for vertically driving one needle bar at a sewable position of the plurality of needle bars, a rotary hook that cooperates with a sewing needle of the needle bar at a sewable position to capture a thread wheel, There is provided a needle bar switching mechanism for moving the needle bar case to selectively switch a plurality of needle bars to sewing positions.

Conventionally, as a hook driving mechanism for driving a rotary hook, a spindle-linked type driven in conjunction with a spindle rotated by a sewing machine motor and an independent drive type driven independently by a stepping motor have been practically used. However, usually, the rotary hook is composed of an inner hook that houses a bobbin case that holds the lower thread bobbin, and an outer hook that rotates on the outer side of the inner hook and has a sword tip on the outer periphery, and is fixed to the outer hook. A drive shaft or an output shaft of a stepping motor connected to the main shaft is connected to an end of the shuttle shaft, and the outer shuttle is driven to rotate.

The needle bar and the outer hook of the rotary hook at the sewing-possible position are driven with a predetermined phase difference, and when the phase of the outer hook reaches a predetermined phase (for example, about 190 °), the eye hole of the sewing needle and the outer hook of the outer hook are driven. The point of the sword meets the sword, the sword hooks the upper thread extending from the eye hole, and the rotation of the outer hook causes the upper thread to move between the inner hook and the outer hook to form an upper thread loop, and the lower thread bobbin Entangled with the lower thread extending from the thread, and then a seam is formed by tightening the thread of the balance.

[0005] By the way, in order to reliably form the upper thread loop by hooking the upper thread extending from the eye of the sewing needle with the blade point of the rotary hook, the gap between the sewing needle and the blade point must be set to an appropriate gap (a predetermined gap). (Set gap). However, due to a manufacturing error or an assembly error of the needle bar case, the needle bar, the sewing needle, or the like, the gap between the sewing needle and the rotary hook at the sewable position of the plurality of needle bars is likely to vary. The entire gap cannot be set as the set gap.

Therefore, the applicant of the present application has proposed a multi-needle type in which the position of the rotary hook in the hook axis direction can be adjusted so that the gap between the sewing needle of the needle bar at the sewing-possible position and the blade point of the rotary hook becomes the set gap. A sewing machine has been proposed and put into practical use (Japanese Patent Application No. 9-282598).
issue).

The multi-needle sewing machine has a pivot member for pivotally supporting the shuttle shaft of the rotary hook, and a support member for supporting the pivot member so as to be movable in the direction of the shuttle shaft. The eccentric shaft of the eccentric pin is rotatably supported on the pivot shaft, and the eccentric shaft of the eccentric pin slides in a long groove formed on the pivot member and parallel to the direction perpendicular to both the shuttle shaft and the eccentric pin. The pivotal support member is movably engaged so that the operator rotates the eccentric pin with a tool or the like so that the gap between the sewing needle of the needle bar at the sewing-possible position and the point of the rotary hook becomes the set gap. In addition, the rotary hook together with the hook shaft can be moved in the hook shaft direction to adjust its position.

[0008]

In the multi-needle sewing machine, when moving the rotary hook in the hook axis direction, the operator must manually rotate the eccentric pin using a tool or the like. When setting the gap between the sewing needle of the needle bar at the sewing-possible position and the point of the rotary hook to the set gap, the operator turns the eccentric pin and carefully adjusts the position of the rotary hook while watching the gap between the needle and the point of the rotary hook. The work of adjusting the position of the rotary hook is very difficult due to the necessity of adjustment and the like.

In order to set all the gaps between the sewing needles at the sewing positions of the plurality of needle bars and the blade point of the rotary hook to the set gap, the above-described rotary hook position adjusting operation is performed by changing the needle bar by the needle bar switching mechanism. Since it has to be performed every time switching is performed, there is a problem that the work load is extremely large, and furthermore, the work time is long, and the sewing efficiency is significantly reduced.

An object of the present invention is to simply and reliably adjust the position of a rotary hook in the hook axis direction such that a gap between a sewing needle of a needle bar at a position where sewing is possible and a blade point of the rotary hook becomes a set gap. It is another object of the present invention to provide a rotary hook position adjusting device for a multi-needle sewing machine which can automatically adjust the position of the rotary hook in the shuttle shaft direction each time the needle bar is switched by the needle bar switching mechanism.

[0011]

According to a first aspect of the present invention, there is provided a rotary hook position adjusting device for a multi-needle sewing machine, comprising: a plurality of needle bars stored in a needle bar case; In a multi-needle sewing machine provided with a needle bar switching mechanism for selectively switching the needle bar to a sewable position that can be driven up and down, and a rotary hook that catches a thread wheel in cooperation with the needle of the needle bar in the sewable position. And a guide mechanism for movably guiding the rotary hook in the hook axis direction, and a rotary hook drive mechanism including an actuator for driving the rotary hook in the hook axis direction.

A plurality of needle bars housed in the needle bar case are selectively switched to a sewable position by a needle bar switching mechanism, and when the needle bar at the sewable position is driven up and down, the needle bar is moved. In cooperation with the sewing needle, the thread wheel is captured by the rotary hook which is driven to rotate, and the seam is formed. The rotary hook is guided movably in the hook axis direction by a guide mechanism, and is driven to move in the hook axis direction by a rotary hook drive mechanism including an actuator.

Therefore, even if the gap between the sewing needle and the point of the rotary hook at the sewable position of a plurality of needle bars varies due to a manufacturing error or an assembly error of the needle bar case, the needle bar or the sewing needle, etc. The rotary hook drive mechanism including the actuator moves the rotary hook in the hook axis direction so that the gap between the sewing needle of the needle bar at the sewing-possible position and the blade point of the rotary hook becomes an appropriate predetermined gap (set gap). To adjust the position of the hook shaft in the axial direction easily and reliably.

As a result, the entire gap between the sewing needle and the point of the rotary hook at the position where a plurality of sewing needles can be sewn can be easily adjusted to the set gap. The needle thread can be reliably hooked to form a needle thread loop, and there is no danger that the needle of the sewing needle and the blade of the rotary hook will buffer each other, and it is possible to increase sewing efficiency and reliably form a beautiful stitch. .

According to a second aspect of the present invention, there is provided a rotary hook position adjusting device for a multi-needle sewing machine according to the first aspect of the present invention, wherein the needle bar switching mechanism and the needle of the needle bar at the sewing-enabled position are rotated each time the needle bar is switched. Control means for driving and controlling an actuator is provided so as to move the rotary hook to a reference position where a gap between the hook and the sword tip becomes a set gap.

Every time the needle bar is switched by the needle bar switching mechanism, the actuator is driven and controlled by the control means, and the rotary hook is moved to the reference position by the shuttle driving mechanism including the actuator, and is at the sewing-possible position. The gap between the needle of the needle bar and the point of the rotary hook is the set gap. That is, by providing the control means, every time the needle bar is switched, the position of the rotary hook in the shuttle shaft direction can be automatically adjusted to the reference position corresponding to the sewing needle of the needle bar in the sewing possible position,
Sewing efficiency can be significantly improved. Other claim 1
It has the same function as.

According to a third aspect of the present invention, there is provided a rotary hook position adjusting device for a multi-needle sewing machine according to the second aspect, wherein a reference position of the rotary hook is previously set for each of the plurality of needle bars. Position setting means is provided, and information on the reference position is supplied from the reference position setting means to the control means.

By providing the reference position setting means, the reference position of the rotary hook can be easily set in advance for each of a plurality of needles of the needle bar. Each time the needle bar is switched, the actuator is driven and controlled by the control unit based on the information on the reference position, and the gap between the needle of the needle bar at the sewing possible position and the blade point of the rotary hook is set to the set gap. The rotary hook is driven to move to the reference position where. Other effects are the same as those of the second aspect.

According to a fourth aspect of the present invention, in the rotary hook position adjusting device for a multi-needle sewing machine according to any one of the first to third aspects, the actuator comprises a stepping motor. Stepping motor starts,
Stopping, forward / reverse rotation, shifting is easy, good responsiveness, and high torque can be obtained at low speed.Therefore, the clearance between the needle bar of the needle bar at the sewing available position and the blade point of the rotary hook is a predetermined clearance. Thus, the rotary hook can be moved and driven in the hook axis direction, and the position in the hook axis direction can be reliably adjusted. In addition, the same operation as any one of the first to third aspects is achieved.

According to a fifth aspect of the present invention, there is provided a rotary hook position adjusting device for a multi-needle sewing machine, wherein the guide mechanism comprises:
The rotating hook drive mechanism converts the rotation of the stepping motor into movement of the support in the hook axis direction. An eccentric pin mechanism is provided.

When the stepping motor is driven, the rotation of the stepping motor is converted by the eccentric pin mechanism into the movement of the support in the hook shaft direction, and the rotary hook is moved and driven together with the pivoting member and the hook shaft in the hook shaft direction. Is done. In this rotary hook position adjusting device, the rotary hook drive mechanism including the eccentric pin mechanism can be configured with a simple structure, which is advantageous in terms of manufacturing cost. Other operations are the same as those of the fourth aspect.

According to a sixth aspect of the present invention, in the rotary hook position adjusting device for a multi-needle sewing machine according to any one of the first to fifth aspects, the rotary hook driving mechanism regulates rotation of an inner hook of the rotary hook. The rotation restricting member is driven to move integrally with the rotary hook in the hook axis direction.

Usually, the rotary hook has an inner hook for accommodating a bobbin case for holding the lower thread bobbin, and an outer hook having a sword point formed on the outer periphery and rotating on the outer periphery of the inner hook. The rotation of the inner hook of the rotary hook is regulated by the member, but the rotation-regulating member is moved integrally with the rotary hook in the shuttle shaft direction by the rotary hook drive mechanism. Even if the position is changed, the state in which the rotation of the inner hook is regulated by the rotation regulating member can be reliably maintained. In addition, the same operation as any one of the first to fifth aspects is achieved.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example in which the present invention is applied to each of three multi-needle embroidery sewing machines of a multi-head embroidery sewing apparatus capable of simultaneously embroidering three identical embroidery patterns on a work cloth to be sewn. .

As shown in FIG. 1, a multi-head embroidery sewing apparatus M
Has a base frame 1 that is long on the left and right, and three multi-needle embroidery sewing machines M1 to M3 (hereinafter, referred to as sewing machines) are arranged side by side on the upper side of the base frame 1.

A sewing machine support plate 2 having a substantially rectangular shape in a plan view is provided on the rear upper side of the base frame 1, and a support frame 3 extending in the left-right direction is erected on the upper surface of the rear end portion of the machine support plate 2. Arm portions 4 to 6 of sewing machines M1 to M3 extend forward, and bed portions 7 to 9 of sewing machines M1 to M3 face arm portions 4 to 6 from a portion located on the front side of support frame 3 of base frame 1. Extending forward.

On the front upper side of the base frame 1, a work table 10 having substantially the same level as the upper surfaces (bed surfaces) of the bed portions 7 to 9 and a pair of auxiliary tables located on both left and right sides of the work table 10 11 and 12 are provided. On these tables 10 to 12, a cloth holding frame 13 having a rectangular frame shape in a plan view, which is long in the left-right direction and capable of holding a work cloth to be sewn in a stretched state, is placed.
a is driven to move in the front-rear direction by a front-rear drive mechanism (not shown), and the right drive frame 13b of the movable frame 13 is driven to move in the front-rear direction and the left-right direction by a front-rear drive mechanism and a left-right drive mechanism (not shown).

A sewing machine M1 is provided on the upper surface of the support frame 3.
Three thread stands 14 corresponding to .about.M3 are provided, and twelve thread spools 15 can be set up on each thread stand 14. An operation panel 16 is provided at the rear of the auxiliary table 12. The operation panel 16 includes a sewing start key 105, a sewing end key 106, a needle bar switching key 107,
Reference position setting mode key 108, reference position setting key 109,
Rotary hook position adjusting key 110, numeric keypad 111 (see Fig. 10)
And a display 17 for displaying messages related to embroidery sewing, position adjustment of the rotary hook 25 and the like.

The sewing machines M1 to M3 will be described. However, since the three sewing machines M1 to M3 have substantially the same structure,
The same components will be described with the same reference numerals.

As shown in FIG. 1 to FIG.
M3 includes twelve vertically oriented needle bars 21 housed in a needle bar case 20 and arranged in one row on the left and right, and twelve balances 23 arranged in one row on the left and right above these needle bars 21. , 1
A needle bar drive mechanism (not shown) for vertically driving one of the two needle bars 21 at the sewable position and a balance 23 corresponding to the needle bar 21 at the sewable position are vertically driven. A balance driving mechanism (not shown), a needle bar switching mechanism 24 for moving the needle bar case 20 to the left and right to selectively switch the twelve needle bars 21 to the sewing possible position, and a needle bar 21 at the sewing possible position. Rotary hook 25 that cooperates with the sewing needle 22 to capture the thread loop.
And a rotary rotary drive 26 for rotating the rotary rotary 25
And a rotary hook position adjusting device 27 for adjusting the position of the rotary hook 25 in the front-rear direction.

The needle bar driving mechanism and the balance driving mechanism are linked to a main shaft (not shown) rotated by a sewing machine motor 115 (see FIG. 10), and the needle bar 21 and the balance 23 at the sewable position are linked.
Are driven up and down. Further, although not shown, when the needle bar 21 at the sewable position is in the process of ascending from the needle lower position, the upper thread extending from the eye of the sewing needle 22 attached to the lower end thereof is cut below the needle plate 19. A thread trimming mechanism is also provided. Note that these mechanisms are existing mechanisms and will not be described.

The needle bar switching mechanism 24 will be described. As shown in FIGS. 3 and 4, the needle bar switching mechanism 24 includes a drive rod 30 fixed to the three needle bar cases 20 of the three sewing machines M1 to M3 so as to be inserted in the left and right direction, and a stepping motor 35. And a needle drive mechanism 31 for driving the drive rod 30 in the left-right direction, a needle bar case position detection sensor 32 (see FIG. 10) for detecting the position of the needle bar case 20, and the like. The needle bar case 20 is configured to be integrally moved left and right so that the 12 needle bars 21 of the three needle bar cases 20 can be selectively switched to the sewable positions at the same time.

As shown in FIG. 3, a support member 33 is fixed to the needle bar case 20 of each of the sewing machines M1 to M3, and a pair of fixing portions 34a is attached to a mounting portion 33a at the right end of each support member 33. The driving rod 30 is inserted through the connecting member 34 and fixed by a pair of fixing portions 34 a, so that the three needle bar cases 20 are integrally formed via the driving rod 30. It is connected to.

The rod driving mechanism 31 will be described.
As shown in FIG. 4, the arm 5 of the central sewing machine M2 has
A support frame 36 is fixed on the rear side of the support member 33, and a rotation shaft 37 that is
Are rotatably supported. A spiral cam 37a and a bevel gear 37b are fixed to the rotating shaft 37, and the bevel gear 3 fixed to the output portion 35a of the stepping motor 35 is fixed to the bevel gear 37b.
5b is engaged.

On the other hand, twelve engaging bolts 38a corresponding to the twelve needle bars 21 are provided on the bolt mounting plate 38 erected at the rear end of the support member 33 at the same pitch as the pitch between the needle bars 21. The screw cam 37a can be slidably engaged with the engagement bolts 38a by being inserted from the rear into the bolt attachment plate 38 and fixed at the front side of the bolt attachment plate 38 with a nut 38b. .

Accordingly, when the stepping motor 35 is driven, the helical cam 37a is rotated together with the rotary shaft 37 via bevel gears 35b and 37b, and the bolt 38a engaged with the helical cam 37a is driven to move left and right. Then, the drive rod 30 is driven in the left-right direction via the bolt mounting plate 38, the support member 33, and the connecting member 34, and the three needle bar cases 20 are integrally driven to move left and right.

On the other hand, as shown in FIGS. 2, 5 and 6, the bed portions 7 to 9 of the sewing machines M1 to M3 have their rear ends fixed to the sewing machine support plate 2 via a pair of support brackets 18b. A bed case 18 having a substantially U-shaped cross section is provided. The upper side of the front end of the bed case 18 is covered with a needle plate 19, and the upper side of a portion of the bed case 18 behind the needle plate 19 is a needle plate 19.
The bed case 1 is covered with a cover plate 18a substantially continuous with the bed case 1.
8, a rotary hook 25 and a rotary hook rotation driving device 26
And a rotary hook position adjusting device 27 are provided.

First, the rotary hook rotary driving device 26 will be described. As shown in FIGS. 5 to 7, the rotary hook rotary driving device 26 has a stepping motor 40 for rotatingly driving the rotary hook 25, and a front end of an output shaft 40 a of the stepping motor 40 and the rotary hook 25 a of the rotary hook 25. The rotation driving force of the output shaft 40a is applied to the connecting portion 41 connecting the rear end portion of the shuttle shaft 25.
and a ring-shaped tension member 43 that attenuates the relative rotation between the shuttle shaft 25a and the output shaft 40a through friction by transmitting an elastic member 42 made of hard rubber capable of transmitting a shock to the a.

At the front end of the bed case 18, a mounting block 44 having a block portion 45, an accommodating portion 46, and a rear wall portion 47 is detachably fixed by a plurality of screws 44a. The front end of the stepping motor 40 is fixed to the rear end by a plurality of screws 40b, and the output shaft 40a of the stepping motor 40 is
The hole 47a formed in the rear wall portion 47 is inserted and extends to the accommodation portion 46 on the front side. The output shaft 40a also protrudes rearward of the stepping motor 40, and a cooling fan 39 is fixed to the protruding portion.

On the other hand, the block portion 4 of the mounting block 44
5, a through-hole 45a is formed in the front-rear direction, and a sleeve 48 is internally fitted in the through-hole 45a so as to be able to move back and forth. A bearing 49 is press-fitted into the sleeve 48 from the front and is prevented from being removed by a retaining member 49a.
a is inserted through a sleeve 48, and is rotatably supported via a bearing 49 so as to be rotatable and immovable in the longitudinal direction. The rear portion of the base member 19a is fixed to the upper surface of the block portion 45, and the needle plate 19 is mounted on the upper surface side of the base member 19a.

As shown in FIG. 5, FIG. 6, and FIG.
Reference numeral 1 denotes a substantially semi-cylindrical first partial cylindrical portion 50 fixed to the output shaft 40a of the stepping motor 40 in the housing portion 46 of the mounting block 44, and faces the first partial cylindrical portion 50 via the elastic member 42. And a second semi-cylindrical second cylindrical portion 55 fixed to the shuttle shaft 25a.

At the front end of the output shaft 40a of the stepping motor 40, a connecting member 51 is fitted.
The rear end of the connecting member 51 is formed in the first partial cylindrical portion 50, and a connecting member 56 is fitted in the vicinity of the rear end of the shuttle shaft 25a and is fixed by a pair of screws 56a. A front end portion of the member 56 is formed in the second partial cylindrical portion 55. The rear end of the shuttle shaft 25a is inserted through the insertion hole 42a of the elastic member 42, and is slidably fitted in the connecting member 51 fixed to the output shaft 40a.

Both circumferential end surfaces of the first partial cylindrical portion 50 are formed on the contact surface 52 on the same plane, and both circumferential end surfaces of the second partial cylindrical portion 55 are formed on the contact surface 57 on the same plane. The opposing abutting surfaces 52 and 57 abut against the elastic member 42, so that the rotational driving force of the output shaft 32 can be transmitted to the shuttle shaft 25a via the elastic member 42, and a buffer action can be obtained. I have.

The tension member 43 is formed in a coil shape tightly wound around the outer peripheral surfaces of the first and second partial cylindrical portions 50 and 55, and the first partial cylindrical portion 50 is made of an epoxide resin or the like. When the hook shaft 25a and the output shaft 32 rotate relative to each other, the first partial cylindrical portion 50 and the tension member 43 are fixed.
Rotate integrally, friction acts between the outer peripheral surface of the second partial cylindrical portion 55 and the tension member 43, and the relative rotation between the shuttle shaft 25a and the output shaft 40a is attenuated through this friction. It is configured as follows.

The output shaft 40 of the stepping motor 40
A disk encoder 60 is attached to the connecting member 51 fixed to the position a. The optical sensor 61a, 61b provided with a light emitting portion and a light receiving portion provided with the disk encoder 60 interposed therebetween allows the origin position of the stepping motor 40 to be determined. And the rotational position can be detected. A vertical bar 62 is fixed to the bottom of the bed case 18 with screws 62a, and a vertical mounting plate 63 is fixed to the vertical bar 62 with screws 63a, and the optical sensors 61a, 61 are fixed to the mounting plate 63.
b is attached.

Here, the rotary hook 25 will be described.
As shown in FIGS. 5 to 7 and 9, the rotary hook 25 is provided with an inner hook 7 for holding a bobbin case 71 for accommodating a lower thread bobbin 70.
2 and an outer shuttle 73 rotating outside the inner shuttle 72. The outer shuttle 73 is externally fitted to the distal end of the shuttle shaft 25a and fixed with a plurality of screws 73b. A point 73a for hooking the upper thread extending from the eye hole to form an upper thread loop is formed.

When the phase of the main shaft is, for example, about 190 °,
The timing at which the point 73a and the eye of the sewing needle 22 meet is the timing at which the point 73a
Catches the needle thread on the needle side extending from the eye of the sewing needle 22, and the rotation of the outer shuttle 73 thereafter forms an upper thread loop that moves between the inner shuttle 72 and the outer shuttle 73. By the tightening, the lower thread and the upper thread extending from the lower thread bobbin 70 are entangled to form a seam.

The rotary hook 2 is attached to the front end of the sleeve 48.
5, a frame-shaped rotation restricting member 75 surrounding the upper end portion is fixed, and an engagement protrusion 76a projecting rearward is formed on a hook stopper member 76 at the front end of the rotation restricting member 75 in the left-right direction. The engagement protrusion 76a is loosely engaged with a concave portion 72a formed at the upper end of the inner shuttle 72, and the inner shuttle 72 is restricted in rotation. At the front end of the bed case 18, a cover 77 for covering the front side of the rotary hook 25 is detachably attached.

Next, the rotary hook position adjusting device 27 will be described. As shown in FIGS. 5 and 7, the rotary hook position adjusting device 27 guides the rotary hook 25 movably in the front-rear direction which is the hook axis direction, and drives the rotary hook 25 to move in the front-rear direction. A rotary hook driving mechanism 81 including a stepping motor 82, and a rotary hook front and rear direction origin position detecting sensor 102 for detecting the original position of the rotary hook 25 in the front and rear direction (FIG. 10)
Reference).

The guide mechanism 80 is provided with a hook shaft 25 of the rotary hook 25.
a has a block portion 45 (mounting block 44) corresponding to a support member that movably supports a sleeve 48 corresponding to a pivotal member via a bearing 49 in the front-rear direction. It is guided and supported by the block portion 45 via the sleeve 48 and the shuttle shaft 25a so as to be movable in the front-rear direction. Even if the hook shaft 25a moves in the front-rear direction,
By the connecting portion 41, the rotational driving force of the output shaft 40a of the stepping motor 40 can be transmitted to the shuttle shaft 25a,
The buffering action by the elastic member 42 and the damping action by the tension member 43 are also obtained.

The rotary hook driving mechanism 81 has a stepping motor 82 and an eccentric pin mechanism 83 for converting the rotation of the stepping motor 82 into the movement of the support in the front-rear direction.
The stepping motor 82 is fixed to the left side surface of the front end portion of the bed case 18, and the output shaft 82 a of the stepping motor 82 extends through the hole 18 c formed in the left side wall of the bed case 18 and extends into the bed case 18. .

The eccentric pin mechanism 83 has an eccentric pin 84 composed of a pivot shaft 85 and an eccentric shaft 86. The output shaft 82a of the stepping motor 82 is fixedly fitted to the eccentric pin 84. In the block portion 45 of the mounting block 44, a pin hole 87 extending in the left-right direction is formed so as to be inserted into the insertion hole 45a from the left side, and a vertically elongated pin groove 88 is formed in the outer peripheral portion of the sleeve 48, The pivot shaft portion 85 of the eccentric pin 84 is press-fitted into the pin hole 87 so that the eccentric pin 8
The fourth eccentric shaft portion 86 is slidably engaged with the pin groove 88.

That is, when the eccentric pin 84 is rotated by the stepping motor 82, a minute stroke (approximately 2 mm) which is twice the distance between the center axes of the pivot shaft portion 85 and the eccentric shaft portion 86 (about 1 to 2 mm). ４８4 mm), the sleeve 48 and the hook shaft 2
The rotary hook 25 is driven to move back and forth together with 5a. When the position of the rotary hook 25 in the front-rear direction is not adjusted for a long time, the tip of the set screw 89 screwed to the block 45 is pressed against the vertical surface 89a of the sleeve 48, and Sleeve 4
8 can also be fixed.

Next, an outline of a control system of the multi-head embroidery sewing apparatus M will be described with reference to a block diagram of FIG.
The control device C that controls the multi-head embroidery sewing device M is a CP
A microcomputer including a U90, a ROM 91, and a RAM 92; and an input interface 9 connected to the microcomputer via a bus 93 such as a data bus.
4 and an output interface 95.

The input interface 94 includes a main shaft origin position detection sensor 100, a main shaft rotation position detection sensor 101, a needle bar case position detection sensor 32, a rotary hook origin position detection sensor 61a and a rotary hook rotation position detection sensor 61b composed of an optical sensor. , Rotary hook longitudinal direction home position detection sensor 102,
A sewing start key 105, a sewing end key 106, a needle bar switching key 107, a reference position setting mode key 108, a reference position setting key 109, a rotary hook position adjusting key provided on the operation panel 16.
Signals from 110, ten keys 111 and the like are input. Although not shown, in each of the embroidery sewing machines M1 to M3, a rotary hook origin position detecting sensor 61a, a rotary hook rotational position detecting sensor 61b, and a rotary hook longitudinal direction original position detecting sensor are provided.
The signal from 102 is input.

From the output interface 94, a sewing machine motor 115, a front-rear drive motor 116, a left-right drive motor 117
Control signals are output to a needle bar switching stepping motor 35, a rotary hook rotating drive stepping motor 40, a rotary hook longitudinal position adjusting stepping motor 82, and drive circuits 120 to 126 for the display 17. Although not shown, in each of the embroidery sewing machines M1 to M3,
A control signal is output to a drive circuit for the rotary hook rotating drive stepping motor 40 and the rotary hook front-back direction position adjusting stepping motor 82.

The ROM 91 of the control device C stores a plurality of embroidery data, an embroidery data selection and editing program which can select desired embroidery data from the plurality of embroidery data and can further edit the embroidery data. Drive motor
116, left and right drive motor 117, needle bar switching stepping motor 35, rotary hook rotating drive stepping motor 40
And the like are stored.

Further, in the ROM 91, every time the needle bar 21 is switched by the needle bar switching mechanism 24, a gap between the sewing needle 22 of the needle bar 21 at the sewing possible position and the point 73a of the rotary hook 25 is preset. The control program of the rotary hook position adjustment control for driving and controlling the stepping motor 82 so as to move the rotary hook 25 to a reference position that is an appropriate gap (set gap), the control program for each of the sewing needles 22 of the plurality of needle bars 21 A control program for reference position setting control for setting a reference position of the rotary hook 25 in advance is stored.

Next, regarding the rotary hook position adjustment control,
This will be described with reference to the flowchart of FIG. However, S in the figure indicates each step. In addition, 12 of each sewing machine M1 to M3
The needle bar numbers N of the needle bars 21 are, for example, 1, 2,
12, reference position data D relating to the reference position of the rotary hook 25 with respect to the needle bar 21 having the needle bar numbers 1, 2, 3,..., Are D1, D2,. D
3... Are set to D12 and control device C
In a rewritable manner in a RAM 92.

The rotary hook position adjustment control is started when the power is turned on. First, when the needle bar 21 is switched by the needle bar switching mechanism 24 (S1; Yes), the needle bar of the needle bar 21 switched to the sewing available position is switched. The number N is read (S2), and subsequently, the reference position data D of the needle bar number N is read (S2).
3) A stepping motor drive control signal is output based on the reference position data D (S4).

Then, the driving of the stepping motor 82 is controlled, and the rotary hook drive mechanism 27 including the stepping motor 82 drives and drives the rotary hook 25 in the front-rear direction. The gap with the sword tip 73a is adjusted to the reference position where it becomes the set gap,
Then return.

Next, the reference position setting control will be described with reference to the flowchart of FIG. However, S in the figure
Indicates each step. The reference position setting control is started when the power is turned on.
When 7 is turned on (S10; Yes), it becomes possible to execute the rotary hook longitudinal position adjustment (S11).

In adjusting the position of the rotary hook in the front-rear direction,
For example, the operator can operate the rotary hook position adjusting key 110 to drive the stepping motor 82 to adjust the position of the rotary hook 25 in the front-rear direction, and thereafter, the reference position setting key 109 is turned on. Then (S12; Ye
s) The position is set as the reference position, the reference position data D is stored in the RAM (S13), and the routine returns.
By operating the needle bar switching key 107, the operator can appropriately switch the needle bar 21 of the desired number N to the sewing available position. Therefore, steps S1 to S4 constitute control means of the present invention, and steps S10 to S13 constitute reference position setting means of the present invention.

Next, the operation and effect of the rotary hook position adjusting device 27 will be described. Rotary shuttle drive mechanism 27 including a stepping motor 82 for driving rotary shuttle 25 to move forward and backward.
The needle bar case 20, the needle bar 21, the sewing needle 22, etc., have a variation in the front-rear position of the sewing needle 22 at the sewable position of the needle bar 21 due to a manufacturing error or an assembly error of the needle bar 21. The rotary hook 25 is moved in the front-rear direction so that the gap between the sewing needle 22 of the needle bar 21 at the sewing-possible position and the sword tip 73a of the rotary hook 25 becomes the set gap, and the position in the front-rear direction is easily and reliably adjusted. can do.

Accordingly, the entire clearance between the sewing needle 22 and the point 37a of the rotary hook 25 at the sewing-possible positions of the plurality of needle bars 21 can be set to the set gap. The needle thread 37a can be securely hooked to form the upper thread loop, and there is no danger that the sewing needle 22 and the blade 37a of the rotary hook 25 will buffer each other, thereby increasing the sewing efficiency and reliably forming a beautiful stitch. It becomes possible to do.

Further, the needle bar switching mechanism 24 controls the needle bar 21
Every time is switched, the sewing needle 2 of the needle bar 21 at the sewing possible position is
Since the stepping motor 82 is driven and controlled so that the rotary hook 25 is moved to the reference position where the gap between the rotary hook 2 and the blade point 37a of the rotary hook 25 becomes the set gap, sewing is performed every time the needle bar 21 is switched. Sewing needle 2 of needle bar 21 at possible position
Since the position in the front-rear direction of the rotary hook 25 can be automatically adjusted to the reference position corresponding to 2, the sewing efficiency can be significantly improved.

The stepping motor is easy to start, stop, forward / reverse, and shift, has good responsiveness, and can obtain a high torque at a low speed. By applying
The rotary hook 25 is moved in the front-rear direction so that the gap between the sewing needle 22 of the needle bar 21 at the sewable position and the blade point 37a of the rotary hook 25 becomes a predetermined set gap, and the front-rear position is surely adjusted. it can.

Further, the rotary hook driving mechanism 27 includes the eccentric pin mechanism 83 for converting the rotation of the stepping motor 82 into the forward and backward movement of the sleeve 48, so that the rotary hook 25 can be surely moved and driven in the front and rear direction. In addition, the rotary hook driving mechanism 27 can be configured with a simple structure, which is advantageous in terms of manufacturing cost. Further, the rotary hook driving mechanism 27 drives the rotation restricting member 76 for restricting the rotation of the inner rotary hook 72 of the rotary hook 25 integrally with the rotary hook 25 in the front-rear direction. Even if the position is changed, the state in which the rotation of the inner shuttle 72 is restricted by the rotation restricting member 76 can be reliably maintained.

As a modification of the above-described embodiment, although not shown, in the rotary hook position adjusting device 27, the mounting block 44 is movably guided in the front-rear direction with respect to the bed case 18, and the rotary hook drive The mechanism 27 may be configured to move and move the mounting block 44 in the front-rear direction. In this case, in the eccentric pin mechanism 83, the pivot shaft portion 85 of the eccentric pin 84 is pivotally supported by the bed case,
This can be realized by engaging the eccentric pin 84 with a vertically elongated pin groove formed on the mounting block 44.

The rotary hook position adjusting device according to the present invention comprises:
The present invention is not limited to the rotary hook position adjusting device of the above embodiment, and various changes can be made without departing from the spirit of the present invention, and the present invention can be applied to various sewing machines.

[0071]

According to the rotary hook position adjusting device of the multi-needle sewing machine according to the first aspect, the rotary hook driving mechanism including the actuator for moving and driving the rotary hook in the hook axis direction is provided. Even if the gap between the sewing needles at the sewable positions of a plurality of needle bars and the blade point of the rotary hook varies due to manufacturing errors or assembly errors of the rods and sewing needles, etc. The rotary hook drive mechanism including the actuator moves the rotary hook in the hook axis direction so that the gap between the rotary hook and the sword tip becomes a predetermined set gap, and the position in the hook axis direction is easily and reliably adjusted. be able to.

Accordingly, the entire gap between the sewing needle and the rotary hook at the position where a plurality of needle bars can be sewn can be easily adjusted to the set gap. The needle thread can be reliably hooked to form a needle thread loop, and there is no danger that the needle of the sewing needle and the blade of the rotary hook will buffer each other, and it is possible to increase sewing efficiency and reliably form a beautiful stitch. .

According to the rotary hook position adjusting device for a multi-needle sewing machine of the second aspect, the same effect as that of the first aspect is obtained, but every time the needle bar is switched by the needle bar switching mechanism, the needle at the sewable position is provided. Control means for driving and controlling the actuator is provided so that the rotary hook is moved to a reference position where the gap between the needle of the rod and the blade of the rotary hook becomes the set gap. The position of the rotary hook can be automatically adjusted to the reference position corresponding to the sewing needle of the needle bar, and the sewing efficiency can be greatly improved.

According to the rotary hook position adjusting device for a multi-needle sewing machine of the third aspect, the same effect as that of the second aspect can be obtained, but the reference position of the rotary hook is previously set for each of the plurality of sewing needles. Since the reference position setting means for setting is provided, information about the reference position is supplied from the reference position setting means to the control means, so that the reference position of the rotary hook for each of the plurality of needle bars is previously set. It can be set easily.

According to the rotary hook position adjusting device for a multi-needle sewing machine of the fourth aspect, the same effects as those of any one of the first to third aspects can be obtained, but since the actuator is formed of a stepping motor, it is started and stopped. , Forward and reverse rotation, shifting is easy, responsiveness is good, and high torque can be obtained at low speed, so that the gap between the sewing needle of the needle bar at the sewing possible position and the point of As a result, the rotary hook can be moved and driven in the hook axis direction, and the position in the hook axis direction can be easily and reliably adjusted.

According to the rotary hook position adjusting device for a multi-needle sewing machine of the fifth aspect, the same effect as that of the fourth aspect can be obtained, but the guide mechanism includes a rotary support member for supporting the rotary shaft of the rotary rotary hook. The rotary hook drive mechanism has an eccentric pin mechanism that converts the rotation of the stepping motor into the movement of the support in the hook axis direction. As a result, the rotary hook drive mechanism can be configured with a simple structure, which is advantageous in terms of manufacturing cost.

According to the rotary hook position adjusting device for a multi-needle sewing machine according to the sixth aspect, the same effect as in any one of the first to fifth aspects can be obtained, but the rotary hook driving mechanism uses the inner hook of the rotary hook. Since the rotation regulating member that regulates the rotation of the rotary hook is moved integrally with the rotary hook in the direction of the hook axis, even if the position of the rotary hook in the hook axis direction is changed, the rotation of the inner hook is controlled by the rotation regulating member. Can be reliably maintained.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a multi-head embroidery sewing apparatus provided with three multi-needle embroidery sewing machines according to an embodiment of the present invention.

FIG. 2 is a plan view of a main part of the multi-head embroidery sewing apparatus.

FIG. 3 is a plan view of a needle bar switching mechanism.

FIG. 4 is an enlarged view of a main part of FIG. 3;

FIG. 5 is a plan view of the inside of a bed portion of each multi-needle embroidery sewing machine.

FIG. 6 is a side view of the inside of a bed portion of each multi-needle embroidery sewing machine.

FIG. 7 is an exploded perspective view of a rotary hook position adjusting device and a drive system of the rotary hook.

FIG. 8 is an enlarged view of a main part of FIG. 7;

FIG. 9 is a perspective view of a rotary hook.

FIG. 10 is a block diagram of a control device.

FIG. 11 is a table of reference position data stored in a RAM.

FIG. 12 is a flowchart of rotary hook position adjustment control.

FIG. 13 is a flowchart of reference position setting control.

[Explanation of symbols]

 M Multi-head type embroidery sewing machine M1 to M3 Multi-needle embroidery sewing machine C Controller 20 Needle bar case 21 Needle bar 22 Sewing needle 24 Needle bar switching mechanism 25 Rotating hook 25a Hook shaft 27 Rotating hook position adjusting device 44 Mounting block 48 Sleeve 75 times Movement regulating member 80 guide mechanism 81 rotary hook driving mechanism 82 stepping motor 83 eccentric pin mechanism

Claims (6)

[Claims] 1. A plurality of needle bars housed in a needle bar case;
A needle bar switching mechanism for moving the needle bar case to selectively switch a plurality of needle bars to a sewable position in which the needle bars can be vertically driven;
In a multi-needle sewing machine provided with a rotary hook that catches a thread wheel in cooperation with a sewing needle of a needle bar at a sewing-possible position, a guide mechanism that guides the rotary hook movably in a hook axis direction; A rotary hook drive mechanism for a multi-needle sewing machine, comprising: a rotary hook drive mechanism including an actuator that moves and drives the hook in the hook axis direction. 2. Each time the needle bar is switched by the needle bar switching mechanism, the rotary hook is moved to a reference position where the gap between the sewing needle of the needle bar at the sewable position and the blade point of the rotary hook becomes a set gap. 2. The rotary hook position adjusting device for a multi-needle sewing machine according to claim 1, further comprising control means for driving and controlling an actuator. 3. A reference position setting means for presetting a reference position of the rotary hook for each of the plurality of needles of the needle bar, and information relating to the reference position from the reference position setting means to the control means. The rotary hook position adjusting device for a sewing machine according to claim 2, wherein the rotary hook is supplied. 4. The rotary hook position adjusting device according to claim 1, wherein the actuator comprises a stepping motor. 5. The guide mechanism has a support for movably supporting a pivot member for pivoting a shuttle shaft of the rotary shuttle in the shuttle axis direction, and the rotary shuttle drive mechanism supports rotation of a stepping motor. 5. The rotary hook position adjusting device for a sewing machine according to claim 4, further comprising an eccentric pin mechanism for converting the movement of the body in the hook shaft direction. 6. The rotary hook driving mechanism is configured to drive a rotation restricting member for restricting rotation of an inner hook of the rotary hook integrally with the rotary hook in the axial direction of the rotary hook. The rotary hook position adjusting device for a sewing machine according to any one of claims 5 to 13.