CN203113067U - Sewing Machine Needle Bar Switching Device - Google Patents

Abstract

The utility model relates to a needle bar switching device of a sewing machine, which is provided with a needle bar box for accommodating a plurality of needle bars, and the side surface of a needle bar hole on the needle bar box is provided with a longitudinal chute for the embedding of the needle bars; the needle bar holder with one tubular track is set on one side of the needle bar box, the tubular track is embedded with the needle bar and has one longitudinal opening, the needle bar guide rod is clamped with the corresponding needle bar in the longitudinal opening, the needle bar guide rod is driven by the crank link of the sewing machine to move up and down, and the needle bar box is driven and positioned by one driving device to make one needle bar hole move to one sewing position in linear arrangement with the longitudinal opening and the needle bar guide rod. The needle bar which is moved and positioned to the sewing position is selected to be synchronously driven by the needle bar guide rod to move up and down, and other needle bars which are not moved to the sewing position cannot move up and down under the limitation of the controlled guide rail.

Description

Sewing Machine Needle Bar Switching Device

technical field

The utility model relates to a needle bar mechanism installed on the headstock of a sewing machine, in particular to a device that can be selected to change to different needle bars and switch needle bars under the condition that the sewing reference point of the headstock remains unchanged.

Background technique

Please refer to shown in Fig. 1, the traditional linear multi-head sewing machine has a machine platform 10, and a machine frame 11 is extended on the machine platform 10, and a plurality of sewing heads 12 spaced apart from each other are provided on this machine frame 11, and the above-mentioned A plurality of flat plates 13 are arranged on the desktop of the machine platform 10, and the above-mentioned flat plates 13 are perpendicular to each corresponding sewing head 12, and the hook (not shown in the figure) is arranged below the above-mentioned flat plate 13, and can cooperate with each sewing head 12. Complete the sewing operation, and the upper surface of the above-mentioned machine 10 has a support frame 14 and a driving device (not shown) in addition, the above-mentioned support frame 14 generally presents a rectangular shape, and is used to support the cloth to be embroidered, and the above-mentioned drive The device is combined with the support frame 14 so that the support frame 14 can move along the upper surface of the machine table 10 in the X-axis and Y-axis directions on the horizontal plane. Wherein, each sewing head 12 has a plurality of needle bars 15 arranged linearly to provide different kinds of sutures, therefore, the needle bars 15 can be directly selected to sew various sutures.

However, in this multi-head sewing machine, the needle bars 15 of each sewing head 12 are generally arranged in a straight line, and the landing point position of each needle bar 15 is fixed. The width of all the needle bars 15 arranged plus the width of the sewing work surface often causes the support frame 11 on the whole machine table 10 to be bulky, and in actual sewing, once the number of needle bars 15 on the sewing head 12 is large, Then cause the X-axis motion stroke of driving device to must lengthen the design, just can allow the same point of cloth on the platform to be sent respectively to the needle bar 15 positions that are positioned at the leftmost and the rightmost to sew.

Please refer to shown in Fig. 2, in order to reduce the X-axis movement length of the driving device on the platform, another kind of annular multi-head sewing machine has been developed. This annular multi-head sewing machine also has a machine platform 16, and the machine platform 16 Extend a supporting frame 17 that is provided with a plurality of sewing heads 18 arranged at intervals, wherein, the difference from the traditional linear multi-head sewing machine is that there are a plurality of circularly arranged needle bars 19 on the sewing head 18 to provide different kinds of sutures . Although changing the straight line to a circular arrangement design can indeed reduce the movement length of the X-axis, the needle bar landing point of this sewing machine is also fixed. Once the sewing head or the number of needle bars on the sewing head is large, it will still be Affects the length of the X-axis movement stroke.

In view of the shortcomings of the traditional multi-head sewing machine, which are still bulky and the X-axis movement stroke of the driving device must be lengthened, it is necessary to improve and design a needle bar switching mechanism of the sewing machine to improve the current deficiency.

Contents of the invention

The main purpose of this utility model is to provide a needle bar switching device for sewing machines, so that the sewing machine head can be directly changed to different needle bars in the switching device according to sewing needs when the sewing reference point and the position of the bottom platform remain unchanged. Sew for fast and easy needle change sewing.

The secondary purpose of this utility model is that the needle bar switching device has a design to prevent the rotation of the needle bar and limit the axial movement of the needle bar, so that the needle bar moved and positioned at the sewing position can move up and down in the axial direction, and ensure the rest The needle bar that has not moved to the sewing position will not be able to move up and down in the axial direction.

Another purpose of this utility model is that the needle bar box in the needle bar switching device adopts various arrangements such as circumference, straight line or arc to accommodate the needle bars, so that the needle bar switching device can adopt the most suitable configuration according to the size of the headstock structure of different sewing machines. Optimal structural design and assembly, effectively increasing the convenience of assembly and the versatility of application.

In order to achieve the stated purpose, the utility model sewing machine needle bar switching device mainly includes a needle bar box, a needle bar box holder, a plurality of needle bars with sewing machine needles, a needle bar guide rod and a driving device to jointly construct A sewing machine needle bar switching device is provided.

Wherein, the above-mentioned needle bar case has a plurality of needle bar holes arranged at intervals, and at least one longitudinal chute connecting to the outside is opened on the side of each needle bar hole; and the above-mentioned needle bar case holder is located on one side of the above-mentioned needle bar case , has a control guide rail, and the above-mentioned control guide rail has a longitudinal opening; and the above-mentioned needle bars are respectively accommodated in the needle bar holes of the above-mentioned needle bar box, and are embedded in the above-mentioned longitudinal chute and the above-mentioned control guide rail; The above-mentioned needle bar guide rod is engaged with one of the plurality of needle bars corresponding to the position of the above-mentioned longitudinal opening, and is driven by the crank connecting rod of the sewing machine itself to move up and down; finally, the driving device of the utility model is used to drive The above-mentioned needle bar box also has a positioning function, so that one of the above-mentioned plurality of needle bar holes can be selectively moved to a sewing position that matches the above-mentioned longitudinal opening and the above-mentioned needle bar guide rods to form a linear arrangement.

In this way, the needle bar that is selected to be moved and positioned to the above-mentioned sewing position is synchronously driven by the above-mentioned needle bar guide rod to move up and down in the axial direction, and the rest of the needle bars that have not moved to the above-mentioned sewing position are controlled by the above-mentioned control guide rail. Axial movement that cannot go up and down is restricted.

In a preferred embodiment, the needle bar box holder and the needle bar guide rod of the present utility model are located on the same side of the above-mentioned needle bar box; wherein the above-mentioned needle bar is provided with a first protrusion that fits on the above-mentioned control guide rail, and the above-mentioned The needle bar guide rod is provided with a first concave portion corresponding to the first convex portion, so as to achieve mutual engagement and synchronous movement. In addition, the needle bar can also be provided with a concave portion fitted into the control guide rail, and the needle bar guide rod can be provided with a convex portion corresponding to the concave portion.

In another preferred embodiment, the needle bar box holder and the needle bar guide rod of the present utility model are located on the opposite side of the above-mentioned needle bar box; wherein the above-mentioned needle bar is provided with a first convex portion and a second convex portion, and the above-mentioned needle bar The rod guide rod is provided with a first concave portion corresponding to the first convex portion to achieve mutual engagement and synchronous movement, and the second convex portion is embedded in the control guide rail.

In the aforementioned two preferred embodiments, the contacting and engaging surfaces of the above-mentioned first convex portion and the first concave portion are both configured as a set of corresponding protrusions and depressions. Moreover, the plurality of needle bar holes on the needle bar box of the present utility model can be arranged in a circular, straight or arc-curved manner, and are driven by the above-mentioned drive device to perform one of the modes of rotation, linear or swing displacement respectively, so as to change the above-mentioned plural number. The relative position between each needle bar hole and the above-mentioned needle bar guide rod.

In addition, the driving device of the present invention further includes a driving motor and a transmission unit, the above-mentioned driving motor has a driving shaft; one end of the above-mentioned transmission unit is assembled to the above-mentioned driving shaft, and the other end is connected to the above-mentioned needle bar case. In a feasible embodiment, the transmission unit of the present invention can be set as one of a transmission mechanism composed of a gear set, a belt set, a lead screw set, an actuator, a direct drive of a motor, or other executive components.

In addition, the control guide rail of the present utility model can be configured as a groove or a cut groove formed by indenting the surface of the needle bar holder holder, and the needle bar is provided with a protrusion corresponding to the groove or cut groove. Of course, the above-mentioned control guide rail can also be set as a ring flange protruding from the surface of the above-mentioned needle bar box holder, and the above-mentioned needle bar can be set as a corresponding gap or a stopper against the top of the above-mentioned ring flange. , so that the above-mentioned needle bar is restricted by the above-mentioned control guide rail, and cannot perform upward and downward axial movement.

The utility model has the advantage of selectively engaging with a needle bar guide rod at a fixed position through a plurality of needle bars in the needle bar box, so that the sewing machine head can keep the sewing reference point and the position of the bottom platform unchanged. , can be directly changed to different stitches for sewing according to sewing needs.

In addition, the needle bar case and the needle bar case holder of the utility model are respectively provided with longitudinal slide grooves and control guide rails, which can effectively prevent the needle bar from rotating and limit the axial movement of the needle bar, so that the selected needle bar can be moved up and down. , downward axial movement, and ensure that the remaining unselected needle bars will not be able to move upward and downward axially.

Furthermore, the needle bar box of the utility model adopts various arrangements such as circumference, straight line or arc to accommodate the needle bars, so that the needle bar switching device adopts the best structure design and assembly according to the size of the headstock structure of different sewing machines, effectively increasing the assembly capacity. Convenience and wide application.

Description of drawings

Fig. 1 is a perspective view of a conventional multi-head sewing machine with linear arrangement of needle bars;

Fig. 2 is a perspective view of a conventional multi-head sewing machine with annular arrangement of needle bars;

Fig. 3 is a schematic diagram of the needle bar switching device of the present invention installed at the head position of the sewing machine;

Fig. 4 is a perspective view of the annular needle bar switching device of the first preferred embodiment of the present invention;

Fig. 5 is an exploded view of Fig. 4;

Figure 6 is a partially cutaway view of Figure 4;

Fig. 7 is an enlarged view of the engagement of the needle bar and the needle bar guide rod in Fig. 6;

Fig. 8 is an enlarged view of another embodiment of engagement of the needle bar and the needle bar guide rod;

Fig. 9 is a schematic diagram of driving needle exchange in the first preferred embodiment of the present invention;

Fig. 10 is a schematic diagram of sewing in the first preferred embodiment of the utility model;

Fig. 11 is a cross-sectional view of the first preferred embodiment of the utility model, where the control guide rail is designed as a slot;

Fig. 12 is a perspective view of the annular needle bar switching device of the second preferred embodiment of the present invention;

Figure 13 is a side view of Figure 12;

Fig. 14 is a perspective view of Fig. 12 with the ring-shaped needle bar case removed;

Fig. 15 is a sectional view of Fig. 14;

Fig. 16 is a cross-sectional view of the second preferred embodiment of the utility model, where the control guide rail is designed as a slot;

Fig. 17 is a three-dimensional schematic diagram of the second preferred embodiment of the utility model, where the control guide rail is designed as a ring flange;

Fig. 18 is an enlarged schematic diagram of the needle bar of the present utility model corresponding to Fig. 17 where the ring flange is designed as a stopper;

Fig. 19 is a perspective view of a linear needle bar switching device according to a third preferred embodiment of the present invention;

Figure 20 is an exploded view of Figure 19;

Figure 21 is a sectional view of Figure 19;

Fig. 22 is a schematic diagram of driving needle exchange in the third preferred embodiment of the present invention;

Fig. 23 is a perspective view of a linear needle bar switching device according to a fourth preferred embodiment of the present invention;

Fig. 24 is a perspective view of Fig. 23 with the linear needle bar holder removed;

Fig. 25 is a schematic diagram of clamping of the needle bar and the needle bar guide rod in front view 23; and

Fig. 26 is a perspective view of the third embodiment of the curved needle rod box of the present invention.

[Description of main component symbols]

〔Knowledge〕 315---longitudinal chute

10---Machine 32---Ring-shaped needle bar box holder

11---Machine frame 321---Control guide rail

12---sewing head 321a---groove

13---flat 321b---grooving

14---Support frame 321c---Ring flange

15---needle bar 322---longitudinal opening

16---Machine 323---Flange

17---support frame 324---perforation

18---sewing head 33---needle bar

19---needle bar 331---sewing machine needle

[This utility model] 332---the first convex part

20---sewing machine 333---uplift

21---Front 334---Concave

22---needle bar mechanism 335---second convex part

23---crank connecting rod 336---notch

30---needle bar switching device 337---block

31---Ring-shaped needle bar box 34---Needle bar guide rod

311---pivot joint 341---first concave part

312---shaft hole 342---connection part

313---pivot 344---convex part

314---needle bar hole 35---driving device

351---drive motor 371---needle bar hole

352---drive shaft 372---longitudinal chute

36---Transmission unit 38---Line type needle bar box holder

361---Gear Set 381---Control Guide Rail

362---gear set 382---longitudinal opening

363---Gear 39---Arc curved needle bar box

364---rack 391---needle bar hole

37---Linear needle bar box 392---Longitudinal chute

Detailed ways

In order to further have a clear and detailed understanding and understanding of the structure, use and features of the present utility model, the preferred embodiments are now cited, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Please refer to Fig. 3, the utility model is mainly installed on the needle bar mechanism 22 at the headstock 21 of the sewing machine 20, especially with the crank connecting rod 23 in the needle bar mechanism 22, so that the needle on the sewing position The rod 33 can be used to replace the sewing machine needle means through the driving device 35 having a positioning function.

Please refer to Fig. 4 to shown in Fig. 6, in the first preferred embodiment, the utility model comprises an annular needle bar box 31, an annular needle bar box holder 32, a plurality of needles with sewing machine needles 331 Rod 33, a needle bar guide rod 34 and a driving device 35 constitute a sewing machine needle bar switching device 30 altogether.

The inner side of the annular needle bar case 31 of the present utility model extends toward the center with a pivot joint 311, and the pivot joint 311 forms a shaft hole 312 at the axial center of the annular needle bar case 31 for a pivot shaft 313 to pass through. pivotally connected, and a plurality of needle bar holes 314 arranged at intervals are arranged around the ring-shaped needle bar box 31, and the plurality of needle bar holes 314 are arranged in a circle, and each needle bar hole 314 faces the above-mentioned ring. The outer surface of the needle bar case 31 is provided with a longitudinal chute 315 parallel to the axis and connected to the outside. The longitudinal chute 315 extends from the central section of the above-mentioned annular needle bar case 31 to the bottom, so that the subsequent needle bar 33 can be moved by The bottom is passed through upwards.

The annular needle bar box holder 32 of the utility model is sleeved on the outside of the above-mentioned annular needle bar box 31, and a control guide rail 321 is provided on the inner side to surround the top periphery of each longitudinal chute 315, and the control guide rail 321 There is also a longitudinal opening 322 connecting the inside and outside of the above-mentioned annular needle bar holder 32, and the above-mentioned annular needle bar holder 32 is provided with a hole 324 protruding from the top and bottom of the above-mentioned longitudinal opening 322 respectively. flange 323 .

Each of the plurality of needle bars 33 of the utility model is respectively accommodated in one of the needle bar holes 314 of the above-mentioned annular needle bar box 31, and each needle bar 33 has a first protrusion 332 formed on the surface, the first protrusion 332 penetrates the above-mentioned longitudinal sliding groove 315 and fits in the longitudinal opening 322 of the above-mentioned control guide rail 321, wherein the first protrusion 332 of the needle bar 33 located at the above-mentioned longitudinal opening 322 will be exposed to a partial length.

In the preferred embodiment of the drawings, the needle bar guide rod 34 of the present utility model is located outside the longitudinal opening 322 of the above-mentioned annular needle bar holder 32, and is passed through the perforation 324 of the above-mentioned flange 323, and has a first surface on the surface. A concave portion 341 is engaged with a needle bar 33 that exposes a partial length of the first convex portion 332 to achieve the purpose of synchronous movement; and a connecting portion 342 is provided on the opposite surface of the first concave portion 341 to cooperate with the crank The drive of connecting rod 23 moves up and down.

Please refer to FIG. 7 , in order to make the first convex portion 332 of the above-mentioned needle bar 33 and the first concave portion 341 of the above-mentioned needle bar guide rod 34 can be stably engaged, the first convex portion 332 of the present utility model has two contact surfaces as a belt. The protrusion 333 of the guide slope can be more smoothly engaged with the upper and lower contact surfaces of the first recess 341 .

However, the fitting method between the above-mentioned needle bar 33 and the needle bar guide rod 34 is only one of the implementation modes, and it is not limited. Please refer to FIG. 8, that is, the above-mentioned needle bar 33 and the above-mentioned needle bar guide rod The first convex portion 332 and the first concave portion 341 on the 34 can be exchanged with each other, the above-mentioned needle bar 33 is changed to a concave portion 334 similar to the above-mentioned first concave portion 341, and the above-mentioned needle bar guide bar 34 is changed to a similar to the above-mentioned first concave portion 341. A convex portion 344 of the convex portion 332 , or other different engagement structures between the two.

Please refer to Fig. 5 and Fig. 6 again, the driving device 35 of the present utility model comprises a driving motor 351 and a transmission unit 36, and the above-mentioned driving motor 351 is a stepping motor with a positioning function, and has a driving shaft 352 through the above-mentioned transmission unit 36 to drive the above-mentioned annular needle bar box 31; The gear on the top of the needle bar case 31 is used to drive the circular needle bar case 31 to rotate and shift, changing the relative position between each needle bar hole 314 in the above annular needle bar case 31 and the needle bar guide rod 34 .

Please refer to Figures 9 and 10, when the drive motor 351 drives the gear set 361 and the annular needle bar case 31 to rotate and displace, any needle bar 33 in the plurality of needle bar holes 314 can be selectively Move to a sewing position that matches the above-mentioned longitudinal opening 322 and the above-mentioned needle bar guide bar 34 to form a linear arrangement, and the needle bar 33 selected to move and be positioned at the above-mentioned sewing position will be clamped on the above-mentioned needle bar guide bar 34 and received The above-mentioned needle bar guide rods 34 are synchronously driven to move up and down in the axial direction, and the rest of the needle bars 33 that have not moved to the above-mentioned sewing position are restricted by the control guide rail 321 and cannot move up and down in the axial direction.

Please refer to FIG. 11 , the control guide rail 321 in the first preferred embodiment of the present invention can be designed as a groove 321a with the effect of abutting against the upper and lower sides, so as to correspond to the first protrusion 332 of the above-mentioned needle bar 33. In addition to the formed bump, it can also be designed as a slit 321b, and the lower side of the slit 321b is pressed against the first protrusion 332 to form a support end, and the upper side forms an open end. The weight of 33 itself keeps its upper and lower positions.

Please refer to Fig. 12 and Fig. 13 shown as the second preferred embodiment of the present utility model, which also includes an annular needle bar box 31, an annular needle bar box holder 32, a plurality of needles with sewing machine needles 331 Needle bar 33, a needle bar guide rod 34 and a driving device 35 (not shown), wherein the main difference with the first preferred embodiment is: the annular needle bar holder 32 of the first preferred embodiment The needle bar guide rod 34 is located on the same side of the above-mentioned annular needle bar case 31, while the annular needle bar case holder 32 and the needle bar guide rod 34 of the second preferred embodiment are located on the opposite side of the above-mentioned annular needle bar case 31 side.

Since the relative positional relationship between the above-mentioned annular needle bar holder 32, the needle bar guide rod 34 and the annular needle bar case 31 changes, some components will be different from those of the first preferred embodiment, and the same components It will not be described in detail here, but the changed components are the aforementioned annular needle bar case 31 , the annular needle bar case holder 32 and the needle bar 33 .

Please refer to Fig. 14 and Fig. 15, wherein the changed part is: each needle bar hole 314 of the above-mentioned annular needle bar case 31 is respectively provided with a longitudinal chute towards two opposite outer sides (inner side and outer side). 315 (not shown); the above-mentioned annular needle bar case holder 32 is sleeved inside the above-mentioned annular needle bar case 31, and is provided with a control guide rail 321 on the outer surface around the inner side of the above-mentioned annular needle bar case 31 Each longitudinal chute 315; and each needle bar 33 is formed with a first convex portion 332 and a second convex portion 335 on the surface, and the above-mentioned first convex portion 332 passes through the longitudinal slide on the outside of the above-mentioned annular needle bar case 31. Slot 315 is engaged with the above-mentioned needle bar guide bar 34. In addition, the above-mentioned second protrusion 335 passes through the longitudinal slide groove 315 inside the above-mentioned annular needle bar case 31, and is fitted into the above-mentioned annular needle bar case to hold On the control guide rail 321 of the device 32, one of the needle bars 33 located at the above-mentioned longitudinal opening 322 moves axially up and down.

Please refer to shown in Figure 16, in the second preferred embodiment, the above-mentioned annular needle bar holder 32 can also be set as a slot 321b formed from top to bottom (similar to the structure in Figure 11), so that the above-mentioned slot 321b The bottom side is supported against the bottom of the second protrusion 335 , and its up and down positions are also maintained by the weight of the needle bar 33 itself.

In addition, in the various implementations disclosed above, the control guide rail 321 of the above-mentioned annular needle bar holder 32 is recessed to match one of the first convex part 332 or the second convex part 335 of the above-mentioned needle bar 33. block, however, this is only used for convenience of illustration, and is not intended to limit the embedded structure between the control guide rail 321 and the needle bar 33. Please refer to Fig. 17, that is, the control guide rail 321 of the present utility model can also protrude from the surface of the above-mentioned annular needle bar holder 32 to form a ring flange 321c, and the above-mentioned needle bar 33 can be additionally set as a gap 336 or It is an engaging structure in various states such as a stopper 337 (as shown in FIG. 18 ) that is against the above-mentioned ring flange 321c, so as to be positioned corresponding to the above-mentioned ring flange 321c.

From the two preferred embodiments disclosed above, it can be seen that no matter the relative positions of the annular needle bar holder 32 and the needle bar guide rod 34 relative to the needle bar case 31, and regardless of the above-mentioned needle bar 33 and the above-mentioned needle bar guide rod 34 1, the ring-shaped needle bar holder 32 and what kind of structure is used for fitting between the three should be covered in the technical disclosure of the present utility model.

In addition, please refer to Fig. 19, in the third preferred embodiment, the utility model includes a thread-shaped needle bar box 37, a line-shaped needle bar box holder 38, a plurality of needle bars 33 with sewing machine needles 331, A needle bar guide rod 34 and a driving device 35 form a sewing machine needle bar switching device 30 together.

Please refer to Fig. 20 and Fig. 21, the linear needle bar case 37 of the present invention has a plurality of needle bar holes 371 arranged at intervals in a straight line, and each needle bar hole 371 is provided with a longitudinal direction facing two opposite outer sides respectively. The chute 372 (that is, the single needle bar hole 371 has two longitudinal chute 372 ), the longitudinal chute 372 is located in the central section of the linear needle bar case 37 .

The linear needle bar box holder 38 of the present utility model is located on one side of the above-mentioned linear needle bar box 37, and a control guide rail 381 is provided on the adjacent side to cover the outside of each longitudinal chute 372, and the above control guide rail 381 is additionally provided There is a longitudinal opening 382 extending longitudinally.

Each of the plurality of needle bars 33 of the utility model is respectively accommodated in one of the needle bar holes 371 of the linear needle bar box 37, and the surface of each needle bar 33 forms a group of first protrusions 332 located at opposite ends and a The second convex portion 335, the above-mentioned first convex portion 332 are separately installed in the longitudinal chute 372 on one side of the above-mentioned linear needle bar case 37, and the above-mentioned second convex portion 335 is installed in the other side of the above-mentioned linear needle bar case 37. The longitudinal sliding groove 372 on one side is fitted into the longitudinal opening 382 of the control guide rail 381 .

The needle bar guide rod 34 of the utility model is located on the other side of the above-mentioned linear needle bar case 37, opposite to the above-mentioned linear needle bar case holder 38, and has a first concave portion 341 on the surface to cooperate with a needle located at the position of the above-mentioned longitudinal opening 382. The rods 33 are engaged to achieve the purpose of synchronous movement; and the opposite surface of the first concave portion 341 is also provided with a connecting portion 342 , so as to cooperate with the driving of the crank connecting rod 23 to move up and down.

In addition, the design of the contact surface between the first convex portion 332 and the second convex portion 335 in the second preferred embodiment is the same as that of the first preferred embodiment, and will not be repeated here; The fitting method between the bar 33 and the needle bar guide rod 34 is also only for convenience of illustration, and other various engaging structures should be included in the present invention.

As shown in the figure, in the illustrated embodiment, the drive device 35 of the present utility model includes a drive motor 351 and a gear set 362. The above-mentioned drive motor 351 is also a stepper motor with a positioning function, and has a drive shaft 352 and one end of the above-mentioned gear set 362 has a gear 363 pivotally connected to the above-mentioned drive shaft 352, and the other end is provided with a rack 364 that is fixed with the above-mentioned linear needle bar case 37, so as to drive the above-mentioned linear needle bar case 37 to perform a straight line. displacement.

Please refer to Fig. 22, when the above-mentioned drive motor 351 drives the above-mentioned gear set 362 to linearly displace the above-mentioned linear needle bar case 37, any needle bar 33 in the plurality of needle bar holes 371 will also be selectively moved to A sewing position formed in a linear arrangement by cooperating with the above-mentioned longitudinal opening 382 and the above-mentioned needle bar guide rod 34 , and being synchronously driven by the above-mentioned needle bar guide rod 34 to move up and down in the axial direction.

Furthermore, please refer to the fourth preferred embodiment shown in Fig. 23, which also includes a line type needle bar box 37, a line type needle bar box holder 38, a plurality of needle bars 33 with sewing machine needles 331, a needle Rod guide rod 34 and a driving device 35, wherein the main difference with the third preferred embodiment lies in the relative relationship between the above-mentioned linear needle bar case 37, linear needle bar holder 38 and needle bar guide rod 34. The positional relationship changes.

Please refer to Fig. 24 and Fig. 25, wherein the changed part is: each needle bar hole 371 of the above-mentioned linear needle bar case 37 is provided with a single longitudinal chute 372 toward the side of the above-mentioned needle bar guide bar 34; The bar holder 38 is interposed between the above-mentioned linear needle bar case 37 and the above-mentioned needle bar guide bar 34, and a control guide rail 381 is provided on the adjacent side of the above-mentioned linear needle bar case 37, including a cover on the outside of each longitudinal chute 372 The control guide rail 381 is further provided with a longitudinal opening 382 extending longitudinally; and the needle bar 33 is provided with a first protrusion 332 pierced through the longitudinal slide groove 372 and fitted in the longitudinal opening 382 of the control guide rail 381 . Other parts not mentioned are the same as those of the third preferred embodiment, and will not be repeated here.

In addition, besides the circular or linear design, the needle bar box of the present utility model can also be designed in other shapes according to the needs, please refer to Fig. 26, the utility model can also design a curved needle bar box 39, and a plurality of curved needle bar holes 391 arranged at intervals are arranged on the above-mentioned curved needle bar box 39, and each needle bar hole 391 side is provided with a longitudinal chute 392, and a needle bar 33 is installed, and The above-mentioned curved needle bar case 39 will be driven by the above-mentioned driving device 35 to perform a swing displacement, so as to change the relative position between the above-mentioned plurality of needle bar holes 391 and the above-mentioned needle bar guide rod 34 .

Finally, in addition to the gear set 361 and the gear set 362 of the aforementioned four embodiments, the transmission unit 36 in the driving device 35 of the present utility model can also adopt other such as a belt set, a lead screw set, an actuator, a motor to directly drive or There are different forms of other executive components, but all of them can achieve the transmission mechanism design of power transmission and positioning effect.

The above-mentioned embodiments are only used for convenience to illustrate that the utility model is not intended to limit, without departing from the scope of the utility model spirit, familiar with various simple deformations and modifications that can be made by those skilled in the art, all should still be included in the utility model within the scope of patent protection.

Claims (11)

1. A sewing machine needle bar switching device, characterized in that: comprising: A needle bar case with a plurality of needle bar holes arranged at intervals, and at least one longitudinal chute connecting to the outside is provided on the side of each needle bar hole; A needle bar box holder, located on one side of the needle bar box, has a control guide rail, and the control guide rail has a longitudinal opening; A plurality of needle bars with sewing machine needles are respectively accommodated in the needle bar holes of the needle bar case, and fitted into the longitudinal slide groove and the control guide rail; A needle bar guide rod, which is engaged with one of the plurality of needle bars corresponding to the position of the longitudinal opening, and is driven by the crank connecting rod of the sewing machine itself to move up and down; and A driving device, used to drive the needle bar box and has a positioning function, so that one of the plurality of needle bar holes can be selectively moved to a line matching the longitudinal opening and the needle bar guide rod the sewing position; Wherein, the needle bar selected to be moved and positioned to the sewing position will be synchronously driven by the needle bar guide rod to move up and down in the axial direction, and the rest of the needle bars that have not moved to the sewing position will be moved by The control guide rail restricts the upward and downward axial movement. 2. The sewing machine needle bar switching device according to claim 1, wherein the needle bar case holder and the needle bar guide rod are located on the same side of the needle bar case. 3. The sewing machine needle bar switching device according to claim 2, characterized in that: the needle bar is provided with a first convex part fitted in the control guide rail, and the needle bar guide rod is provided with a corresponding The first concave part of the first convex part is used to engage with each other and move synchronously. 4. The sewing machine needle bar switching device according to claim 2, characterized in that: the needle bar is provided with a recess that fits into the control guide rail, and the needle bar guide rod is provided with a protrusion corresponding to the recess. parts, in order to achieve the purpose of engaging with each other and synchronous movement. 5. The sewing machine needle bar switching device according to claim 1, wherein the needle bar case holder and the needle bar guide rod are located on opposite sides of the needle bar case. 6. The sewing machine needle bar switching device according to claim 5, wherein the needle bar is provided with a first protrusion and a second protrusion, and the needle bar guide rod is provided with a corresponding first protrusion. The first concave part of the part is used to achieve the purpose of interlocking and synchronous movement, and the second convex part is embedded in the control guide rail. 7. The sewing machine needle bar switching device according to claim 1, characterized in that: the control guide rail is set as a groove or a cut groove formed by the surface of the needle bar holder holder, and the needle bar A protrusion corresponding to the groove or the slot is provided. 8. The sewing machine needle bar switching device according to claim 1, characterized in that: the control guide rail is set as a ring flange protruding from the surface of the needle bar box holder, and the needle bar is set as A corresponding notch or a block against the top of the ring flange. 9. The sewing machine needle bar switching device according to claim 1, characterized in that: the plurality of needle bar holes of the needle bar box are arranged in a circle, and are rotated and displaced by the driving device to change the needle bar holes. Describe the relative positions between the plurality of needle bar holes and the needle bar guide rod. 10. The sewing machine needle bar switching device according to claim 1, characterized in that: the plurality of needle bar holes of the needle bar box are arranged in a straight line, and are driven by the driving device to perform linear displacement to change the needle bar holes. Describe the relative positions between the plurality of needle bar holes and the needle bar guide rod. 11. The sewing machine needle bar switching device according to claim 1, characterized in that: the plurality of needle bar holes of the needle bar box are arranged in an arc, and are driven by the driving device to perform a swing displacement to change The relative position between the plurality of needle bar holes and the needle bar guide rod.

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