TWI522510B - Sewing machine needle bar switching device - Google Patents

Description

Sewing machine needle bar switching device

The present invention relates to a needle bar mechanism mounted on a front end of a sewing machine, and particularly to a device capable of switching between needle bars by changing to a different needle bar when the sewing head reference point is unchanged.

Referring to Fig. 1, a conventional linear multi-head sewing machine has a machine table 10, and a machine frame 11 is extended on the machine table 10. The machine frame 11 is provided with a plurality of sewing heads 12 separated from each other. A plurality of flat plates 13 are disposed on the table top of the machine table 10. The flat plates 13 are perpendicular to each corresponding sewing head 12, and a hook (not shown) is disposed under the flat plate 13 and can be matched with each sewing head 12. To complete the sewing operation, the upper surface of the machine table 10 further has a support frame 14 and a driving device (not shown). The support frame 14 generally has a rectangular shape and is used to support the fabric to be embroidered. The driving device is coupled to the support frame 14 such that the support frame 14 is movable along the upper surface of the machine table 10 in the X-axis and Y-axis directions on the horizontal surface. Among them, each of the sewing heads 12 has a plurality of linearly arranged needle bars 15 to provide different kinds of stitches, and therefore, the needle bars 15 can be directly selected to perform sewing of various stitches.

However, such a multi-head sewing machine generally has a needle bar 15 of each sewing head 12 arranged in a straight line, and the position of each needle bar 15 is fixed, and therefore, the size of the flat plate 13 on which the cloth is moved by the platform must be able to be covered. The width of the arrangement of all the needle bars 15 plus the width of the sewing work surface tends to cause the support frame 11 on the entire machine table 10 to be bulky, and in actual sewing, once on the sewing head 12 The large number of needle bars 15 causes the X-axis movement stroke of the driving device to be lengthened, so that the same point of the fabric on the platform can be separately sent to the positions of the leftmost and rightmost needle bars 15 respectively.

Referring to Fig. 2, in order to reduce the X-axis movement length of the driving device on the platform, another circular multi-head sewing machine has been developed, which also has a machine table 16 and is machine 16 Extending out a support frame 17 provided with a plurality of spaced apart sewing heads 18, wherein the conventional linear multi-head sewing machine differs in that the sewing head 18 has a plurality of annularly arranged needle bars 19 for providing different types of stitches. . Although changing the straight line into a ring-shaped arrangement design can reduce the length of the X-axis movement, the sewing rod of the sewing machine is also in a fixed position, and once the number of needles on the sewing head or the sewing head is large, Affects the length of the X-axis motion stroke.

In view of the fact that the conventional multi-head sewing machine still has a large volume and the X-axis movement stroke of the driving device must be lengthened, it is necessary to improve the design of a needle bar switching mechanism of the sewing machine to improve the current lack.

The main object of the present invention is to provide a needle bar switching device for a sewing machine, which can change the sewing machine head to a different needle bar for sewing according to the sewing needs, and the sewing machine head can be directly changed in the switching device according to the sewing needs. A quick and easy change of stitching effect.

A secondary object of the present invention is that the needle bar switching device has a design for preventing the rotation of the needle bar and restricting the axial movement of the needle bar, and allows the needle bar that is moved to the sewing position to perform axial movements of the upper and lower sides, and ensures that the rest does not move. The needle bar to the sewing position will not be able to move up and down in the axial direction.

Another object of the present invention is to provide a needle bar in a needle bar switching device in various arrangements such as circumference, straight line or arc, and to facilitate the needle bar switching device according to different sewing machine types. The size of the front structure is assembled and assembled with the best structure, which increases the convenience of assembly and the wide application.

In order to achieve the above object, the present invention mainly comprises a needle bar, a needle bar holder, a plurality of needle bars with a sewing machine needle, a needle bar guide and a driving device to construct a sewing machine needle bar switching device. .

Wherein, the needle bar has a plurality of spaced apart pinholes, and each of the pinholes has at least one longitudinal sliding groove connected to the outside; and the needle bar holder is located on the side of the needle bar The control rail has a longitudinal opening, and the needle bar is respectively received in the needle bar hole of the needle bar and fits into the longitudinal sliding groove and the regulating rail; The needle bar guide rod is engaged with one of the plurality of needle bars corresponding to the longitudinal opening position, and is driven by the crank link of the sewing machine to perform upper and lower movements; finally, the driving device of the present invention is used to drive the above The needle bar has a positioning function such that one of the plurality of needle bar holes is selectively movable to a sewing position in which the longitudinal opening and the needle bar guide are linearly arranged.

In this way, the needle bar that is selectively moved to the above-mentioned sewing position can be moved by the needle bar guide rod to perform the upper and lower axial movements, and the other needle bars that have not moved to the above-mentioned sewing position are restricted by the above-mentioned control rail. Up and down axial movement.

In a preferred embodiment, the needle bar holder and the needle bar guide of the present invention are located on the same side of the needle bar; wherein the needle bar is provided with a first protrusion that is fitted to the control rail, and the needle The rod guiding rod is provided with a first concave portion corresponding to the first convex portion to achieve mutual synchronization and movement. In addition, the needle bar may be provided with a recess fitted to the control rail, and the needle bar guide is provided with a convex portion corresponding to the recess.

In another preferred embodiment, the needle bar holder and the needle bar guide of the present invention are located on opposite sides of the needle bar; wherein the needle bar is provided with a first protrusion and a second protrusion, the needle bar The guiding rod is provided with a first concave portion corresponding to the first convex portion for the purpose of mutually engaging and synchronizing movement, and the second convex portion is fitted into the regulating rail.

In the above two preferred embodiments, the contact engaging surfaces of the first convex portion and the first concave portion are mutually set as a corresponding set of ridges and depressions. Moreover, the plurality of needle bar holes on the needle bar of the present invention can be arranged in a circular, linear or curved arrangement and driven by the driving device to perform one of rotation, linear or oscillating displacement, thereby changing the plurality of needle bars. The relative position of the hole to the above-mentioned needle bar guide.

In addition, the driving device of the present invention further comprises a driving motor and a transmission unit, wherein the driving motor has a driving shaft; and one end of the transmission unit is coupled to the driving shaft, and the other end is connected to the needle bar. In a possible embodiment, the transmission unit of the present invention can be one of a gear mechanism, a belt set, a lead screw set, an actuator, a direct drive of a motor, or a transmission mechanism composed of other actuators.

In addition, the control rail of the present invention may be configured such that a groove or a groove is formed in the surface of the needle bar holder, and the needle bar is provided with a protrusion corresponding to the groove or the groove. Of course, the control rail can also be configured to protrude from the surface of the needle bar holder to form a ring flange, and the needle bar is set as a corresponding notch or a stop against the ring flange. The needle bar is restricted by the above-mentioned control rail, and the axial movement of the upper and lower sides cannot be performed.

The invention is characterized in that a plurality of needle bars in the needle bar are selectively engaged with a needle bar guide rod in a fixed position, so that the sewing machine head can be kept at the sewing reference point and the bottom platform position. Sewing is performed by changing directly to different stitches depending on the sewing needs.

In addition, the needle bar and the needle bar holder of the present invention are respectively provided with a longitudinal sliding groove and a regulating guide rail, 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. The axial movement and ensuring that the remaining unselected needle bars will not move axially up and down.

Furthermore, the needle bar of the present invention accommodates the needle bar by various arrangements such as circumference, straight line or arc, and the needle bar switching device is optimally designed and assembled according to the structure of the head structure of different sewing machines, thereby effectively increasing the assembly. Convenience and wide application.

(known)

10‧‧‧ machine

11‧‧‧ Machine Frame

12‧‧‧Sewing head

13‧‧‧ tablet

14‧‧‧Support frame

15‧‧‧ needle stick

16‧‧‧ machine

17‧‧‧Support frame

18‧‧‧Sewing head

19‧‧‧ needle stick

(this invention)

20‧‧‧Sewing machine

21‧‧‧ head

22‧‧‧Needle bar mechanism

23‧‧‧ crank connecting rod

30‧‧‧Needle bar switching device

31‧‧‧Annual needle stick

311‧‧‧ pivotal department

312‧‧‧ shaft hole

313‧‧‧ pivot

314‧‧‧ pin hole

315‧‧‧ longitudinal chute

32‧‧‧Ring needle stick holder

321‧‧‧Control rail

321a‧‧‧ Groove

321b‧‧‧ slotting

321c‧‧‧ ring flange

322‧‧‧Longitudinal opening

323‧‧‧Flange

324‧‧‧Perforation

33‧‧‧ needle stick

331‧‧‧ sewing machine needle

332‧‧‧First convex

333‧‧ ‧ uplift

334‧‧‧ recess

335‧‧‧second convex

336‧‧ ‧ gap

337‧‧ ‧block

34‧‧‧Needle rod guide

341‧‧‧First recess

342‧‧‧Connecting Department

344‧‧‧ convex

35‧‧‧ drive

351‧‧‧Drive motor

352‧‧‧ drive shaft

36‧‧‧Transmission unit

361‧‧‧ Gear Set

362‧‧‧ Gear Set

363‧‧‧ Gears

364‧‧‧racks

37‧‧‧Line type needle stick

371‧‧‧ pin hole

372‧‧‧Longitudinal chute

38‧‧‧Line type needle bar holder

381‧‧‧Control rail

382‧‧‧Longitudinal opening

39‧‧‧Arc bending stick

391‧‧‧ pin hole

392‧‧‧Longitudinal chute

1 is a perspective view of a conventional needle bar linearly arranged multi-head sewing machine; FIG. 2 is a perspective view of a conventional needle bar annular-arranged multi-head sewing machine; FIG. 3 is a schematic view showing the needle bar switching device of the present invention installed at a sewing machine head position; 4 is a perspective view of a ring-shaped needle bar switching device according to a first preferred embodiment of the present invention; FIG. 5 is an exploded view of FIG. 4; FIG. 6 is a partially cutaway view of FIG. 4; FIG. 8 is an enlarged view of another embodiment of the engagement between the needle bar and the needle bar guide; FIG. 9 is a view of the first preferred embodiment of the present invention. FIG. 10 is a schematic view showing the sewing of the first preferred embodiment of the present invention; FIG. 11 is a cross-sectional view showing the control rail of the first preferred embodiment of the present invention as a slit; 2 is a perspective view of a ring-shaped needle bar switching device; FIG. 13 is a side view of FIG. 12; and FIG. 14 is a perspective view of FIG. 12 for removing a ring-shaped needle bar; 15 is a cross-sectional view of FIG. 14; FIG. 16 is a cross-sectional view of a control rail according to a second preferred embodiment of the present invention, and FIG. 17 is a second preferred embodiment of the present invention. FIG. 18 is an enlarged schematic view showing the flange of the needle bar corresponding to the 17th ring of the present invention as a stopper; FIG. 19 is a perspective view of the linear needle bar switching device according to the third preferred embodiment of the present invention; 20 is an exploded view of FIG. 19; FIG. 21 is a cross-sectional view of FIG. 19; FIG. 22 is a schematic view showing a driving change of a third preferred embodiment of the present invention; FIG. 24 is a perspective view showing the removal of the linear needle bar holder according to FIG. 23; and FIG. 25 is a schematic view showing the needle bar and the needle bar guide of the front view 23; FIG. A perspective view of an embodiment of a third curved needle bar of the present invention.

For a better understanding and understanding of the structure, the use and the features of the present invention, the preferred embodiments are described in detail with reference to the drawings as follows: Referring to Figure 3, the present invention Mainly mounted on the needle bar mechanism 22 at the front end 21 of the sewing machine 20, in particular, the crank link 23 in the needle bar mechanism 22 is assembled to each other, so that the needle bar 33 in the sewing position can pass through the driving device 35 having the positioning function. Replace the sewing machine needle.

Referring to Figures 4 to 6, in the first preferred embodiment, the present invention comprises an annular needle bar 31, an annular needle bar holder 32, and a plurality of needles 331 with a sewing machine. A needle bar 33, a needle bar guide 34 and a driving device 35 cooperate to construct a sewing machine needle bar switching device 30.

The inner side of the annular needle bar 31 of the present invention has a pivoting portion 311 extending toward the center, and the upper portion The pivoting portion 311 forms a shaft hole 312 at a position of the axial center of the annular needle bar 31, and a pivot shaft 313 is pivotally connected, and a plurality of spaced rows are arranged around the annular needle bar 31. The needle bar hole 314 and the plurality of pin bar holes 314 are circumferentially arranged. Further, each of the needle bar holes 314 defines a longitudinal sliding groove 315 which is parallel to the axial center and communicates with the outside toward the outer surface of the annular needle bar 31. The longitudinal sliding groove 315 extends from the central section of the annular needle bar 31 to the bottommost portion, so that the subsequent needle bar 33 is penetrated from the bottom upward.

The annular needle bar holder 32 of the present invention is sleeved on the outer side of the annular needle bar 31, and a regulating rail 321 is disposed on the inner side around the topmost periphery of each longitudinal sliding slot 315, and the above-mentioned regulating rail 321 is disposed. Further, a longitudinal opening 322 is formed in the inner and outer sides of the annular needle bar holder 32, and the annular needle bar holder 32 is further provided with a through hole 324 at the top and the bottom of the longitudinal opening 322. Flange 323.

Each of the plurality of needle bars 33 of the present invention is respectively accommodated in one of the needle bar holes 314 of the annular needle bar 31, and a first convex portion 332 is formed on the surface of each of the needle bars 33, and the first convex portion 332 is formed. The first longitudinal projection 332 of the needle bar 33 located at the longitudinal opening 322 is exposed to a partial length.

In the preferred embodiment of the drawings, the needle bar guide 34 of the present invention is located outside the longitudinal opening 322 of the annular needle bar holder 32, and is disposed in the through hole 324 of the flange 323, and has a first surface. The concave portion 341 is engaged with the needle bar 33 exposing the partial length of the first convex portion 332 to achieve the purpose of synchronous movement; and a connecting portion 342 is disposed on the opposite surface of the first concave portion 341 to cooperate with the crank connecting body. The rod 23 is driven to move up and down.

Referring to FIG. 7 , in order to enable the first convex portion 332 of the needle bar 33 and the first concave portion 341 of the needle bar guide 34 to be firmly engaged, the first convex portion 332 of the present invention sets the two contact surfaces as a belt. The ridge 333 having the guide slope is provided to be more smoothly engaged with the upper and lower contact faces of the first recess 341.

However, the manner of fitting between the needle bar 33 and the needle bar guide 34 is only one of the embodiments, and is not limited thereto. Please refer to FIG. 8 , that is, the needle bar 33 and the needle bar guide. The first convex portion 332 and the first concave portion 341 on the 34 may be exchanged with each other, and the needle bar 33 is changed into a concave portion 334 similar to the first concave portion 341, and the needle bar guide 34 is changed to be similar to the above The convex portion 344 of one convex portion 332 or another different kind of engaging structure between the two.

Referring to FIG. 5 and FIG. 6 again, the driving device 35 of the present invention comprises a driving motor 351 and a transmission unit 36. The driving motor 351 is a stepping motor having a positioning function, and has a driving shaft 352 passing through the transmission. The unit 36 drives the annular needle bar 31; and the transmission unit 36 is a gear set 361 composed of three gears. One end of the gear set 361 is pivotally connected to the drive shaft 352, and the other end is engaged with the ring. The top gear of the needle bar 31 drives the annular needle bar 31 to perform rotational displacement, and changes the relative position between each of the needle bar holes 314 of the annular needle bar 31 and the needle bar guide 34.

Referring to FIG. 9 and FIG. 10, when the drive motor 351 drives the gear set 361 and the annular needle bar 31 to rotate, any one of the plurality of needle bar holes 314 can be selected. Movably moving to a sewing position in which the longitudinal opening 322 and the needle bar guide 34 are linearly arranged, and the needle bar 33 that is moved and positioned to the sewing position is selected to be engaged with the needle bar guide 34 and subjected to The needle bar guides 34 are simultaneously driven to move up and down in the axial direction, and the remaining needle bars 33 that have not moved to the above-mentioned sewing position are restricted by the above-described control rails 321, so that the upward and downward axial movements cannot be performed.

Referring to FIG. 11, the control rail 321 in the first preferred embodiment of the present invention is shown. In addition to being designed as a recess 321a having an upper and lower abutting effect, in addition to the bump formed by the first convex portion 332 of the needle bar 33, it may be designed as a groove 321b, and The lower side of the slit 321b abuts against the first convex portion 332 to form a support end, and the upper side forms an open end, and the upper and lower positions are maintained by the weight of the needle bar 33 itself.

Referring to Figures 12 and 13, there is shown a second preferred embodiment of the present invention, which also includes an annular needle bar 31, an annular needle bar holder 32, and a plurality of sewing machine needles 331. The needle bar 33, a needle bar guide 34 and a driving device 35 (not shown), wherein the main difference from the first preferred embodiment lies in the ring needle bar holder of the first preferred embodiment 32 is located on the same side of the above-mentioned annular needle bar 31 with the needle bar guide 34, and the annular needle bar holder 32 of the second preferred embodiment and the needle bar guide 34 are located at the above-mentioned annular needle bar 31 Opposite side.

Since the relative positional relationship between the above-mentioned annular needle bar holder 32, the needle bar guide 34 and the annular needle bar 31 is changed, some of the members will be different from the first preferred embodiment, and the same members The components to be changed are the above-described annular needle bar 31, the annular needle bar holder 32, and the needle bar 33, respectively.

Referring to FIG. 14 and FIG. 15, wherein the change portion is: each of the needle bar holes 314 of the annular needle bar 31 has a longitudinal direction respectively facing the opposite outer side faces (the inner side surface and the outer side surface). a sliding groove 315 (not shown); the annular needle bar holder 32 is sleeved inside the annular needle bar 31, and a regulating rail 321 is disposed on the outer side around the annular needle bar 31 Each longitudinal slot 315 is formed on the inner side; and each of the needle bars 33 has a first convex portion 332 and a second convex portion 335 formed on the surface, and the first convex portion 332 passes through the outer side of the annular needle bar 31 The longitudinal sliding groove 315 is engaged with the needle bar guide 34, and the second convex portion 335 is inserted into the longitudinal sliding groove 315 inside the annular needle bar 31, and is fitted to the annular needle bar. Control rail 321 of 匣 holder 32 Upper and lower axial movements are performed by one of the needle bars 33 located in the longitudinal opening 322 described above.

Referring to Fig. 16, in the second preferred embodiment, the annular needle bar holder 32 can also be formed as a slit 321b formed from top to bottom (similar to the structure of Fig. 11). The bottom side of the groove 321b is supported against the bottom of the second convex portion 335, and the upper and lower positions are also maintained by the weight of the needle bar 33 itself.

In addition, in various embodiments, the control rail 321 of the annular needle bar holder 32 is recessed to fit one of the first convex portion 332 or the second convex portion 335 of the needle bar 33. However, this is only for convenience of illustration, and does not limit the embedded structure between the above-mentioned control rail 321 and the needle bar 33. Referring to FIG. 17, the control rail 321 of the present invention may also protrude from the surface of the annular needle bar holder 32 to form a ring flange 321c, and the needle bar 33 may be additionally provided as a notch 336 or The engaging structure of the various states, such as the stopper 337 (shown in FIG. 18) above the ring flange 321c, is positioned corresponding to the ring flange 321c.

It is apparent from the foregoing two preferred embodiments that regardless of the relative positions of the annular needle bar holder 32 and the needle bar guide 34 with respect to the needle bar 31, and regardless of the needle bar 33 and the needle bar guide 34 described above. What kind of structural fitting is used between the three types of annular needle bar holders 32 should be covered in the technical disclosure of the present invention.

In addition, referring to FIG. 19, in the third preferred embodiment, the present invention comprises a linear needle bar 37, a linear needle bar holder 38, a plurality of needle bars 33 with a sewing machine needle 331, and a needle. The needle bar guide 34 and a driving device 35 cooperatively form a sewing machine needle bar switching device 30.

Referring to FIGS. 20 and 21, the linear needle bar 37 of the present invention has a plurality of needle bar holes 371 which are arranged in a linear interval, and each of the needle bar holes 371 has a longitudinal direction facing each of the opposite outer sides. The chute 372 (ie, the single needle bar hole 371 has two longitudinal chutes 372), the above longitudinal direction The chute 372 is located in a central section of the linear needle bar 37 described above.

The linear needle bar holder 38 of the present invention is located on the side of the linear needle bar 37, and a regulating rail 381 is disposed on the outer side of each of the longitudinal sliding grooves 372, and the regulating rail 381 is further provided with a longitudinal extension. The longitudinal opening 382.

Each of the plurality of needle bars 33 of the present invention is respectively accommodated in one of the needle bar holes 371 of the linear needle bar 37, and each of the needle bars 33 forms a set of first convex portions 332 and a second at opposite ends. The convex portion 335, the first convex portion 332 is individually passed through the longitudinal sliding groove 372 on the side of the linear needle bar 37, and the second convex portion 335 is inserted through the longitudinal direction of the other side of the linear needle bar 37. The chute 372 and the longitudinal opening 382 of the above-described control rail 381 are fitted.

The needle bar guide 34 of the present invention is located on the other side of the linear needle bar 37, opposite to the linear needle bar holder 38, and has a first recess 341 on the surface thereof and a needle bar 33 located at the position of the longitudinal opening 382. The engagement of the first recess 341 is also provided with a connecting portion 342, so as to cooperate with the crank link 23 to perform the up and down movement.

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 described herein; The manner of fitting between the rod 33 and the needle bar guide 34 is also merely for convenience of illustration, and other various engaging structures of different states are included in the present invention.

As shown, in the illustrated embodiment, the driving device 35 of the present invention includes a driving motor 351 and a gear set 362. The driving motor 351 is also a stepping motor having a positioning function and has a driving shaft 352: The gear set 362 has a gear 363 pivotally connected to the drive shaft 352 at one end, and a rack 364 fixed to the linear needle bar 37 at the other end, so as to drive the linear needle bar 37 to linearly displace.

Referring to FIG. 22, when the drive motor 351 linearly displaces the gear set 362 and the linear needle bar 37, any one of the plurality of needle bar holes 371 is selectively moved to the needle bar 33. A linearly aligned sewing position is formed in conjunction with the longitudinal opening 382 and the needle bar guide 34, and is axially moved by the needle bar guide 34 to move up and down.

Furthermore, please refer to the fourth preferred embodiment shown in FIG. 23, which also includes a linear needle bar 37, a linear needle bar holder 38, a plurality of needle bars 33 with a sewing machine needle 331, and a needle. The rod guide 34 and a driving device 35, wherein the main difference from the third preferred embodiment lies in the relative positional relationship between the linear needle bar 37, the linear needle bar holder 38 and the needle bar guide 34. change.

Referring to FIG. 24 and FIG. 25, wherein the change portion is: each of the needle bar holes 371 of the linear needle bar 37 is provided with a single longitudinal sliding slot 372 toward the needle bar guide 34 side; the above-mentioned linear needle The rod holder 38 is interposed between the linear needle bar 37 and the needle bar guide 34, and a control rail 381 is disposed on the outer side of the linear needle bar 37 to cover the outer side of each of the longitudinal grooves 372. The control rail 381 is further provided with a longitudinally extending longitudinal opening 382. The needle bar 33 is provided with a first protrusion 332 which is inserted through the longitudinal slot 372 and the longitudinal opening 382 of the control rail 381. Other parts that are not described are the same as those of the third preferred embodiment and will not be described herein.

In addition, the needle bar of the present invention can be designed in a ring or a line shape, and of course, can be designed into other shapes according to requirements. Please refer to FIG. 26, and the present invention can also design an arc-shaped needle bar 39. And a plurality of arcuate rod holes 391 are arranged on the arc-shaped needle bar 39, and a longitudinal sliding groove 392 is arranged on a side of each of the needle bar holes 391, and a needle bar 33 is mounted, and the arc is arranged The curved needle bar 39 is oscillated and displaced by the driving of the driving device 35, thereby changing the relative position between the plurality of needle bar holes 391 and the needle bar guide 34.

Finally, the transmission unit 36 in the driving device 35 of the present invention can adopt other gear sets 361 and gear sets 362 of the foregoing four embodiments, and can also be driven by other components such as a belt set, a lead screw set, an actuator, a motor, or the like. Actuator and other different forms, but can achieve the power transmission and positioning effect of the transmission mechanism design.

The above embodiments are intended to be illustrative only, and are not intended to limit the scope of the present invention. It is included in the scope of the following patent application.

23‧‧‧ crank connecting rod

31‧‧‧Annual needle stick

311‧‧‧ pivotal department

312‧‧‧ shaft hole

314‧‧‧ pin hole

315‧‧‧ longitudinal chute

32‧‧‧Ring needle stick holder

321‧‧‧Control rail

321a‧‧‧ Groove

323‧‧‧Flange

324‧‧‧Perforation

33‧‧‧-needle stick

331‧‧‧ sewing machine needle

332‧‧‧First convex

34‧‧‧Needle rod guide

341‧‧‧First recess

342‧‧‧Connecting Department

36‧‧‧Transmission unit

361‧‧‧ Gear Set

Claims (11)

A needle bar switching device for a sewing machine, comprising: a needle bar having a plurality of spaced apart pin holes, wherein each of the pin holes is provided with at least one longitudinal sliding groove connected to the outside; a needle bar holder , on the side of the needle bar, having a control rail, and the control rail has a longitudinal opening; a plurality of needle bars with a sewing machine needle are respectively accommodated in the needle hole of the needle bar and embedded Cooperating with the longitudinal sliding groove and the control rail; a needle bar guide rod is engaged with one of the plurality of needle bars corresponding to the longitudinal opening position, and is driven by the crank link of the sewing machine itself, a lower movement; and a driving device for driving the needle bar and having a positioning function, wherein one of the plurality of needle bar holes is selectively movable to form a linear arrangement with the longitudinal opening and the needle bar guide a sewing position; wherein, selecting a needle bar that is moved and positioned to the sewing position, the needle rod guide rod can be synchronously driven to perform upper and lower axial movements, and the rest is not moved. Needle bar of the sewing position, it is not restricted by the above-described control rail, under axial movement. A sewing machine needle bar switching device according to the first aspect of the invention, wherein the needle bar holder and the needle bar guide are located on the same side of the needle bar. A sewing machine needle bar switching device according to the second aspect of the invention, wherein the needle bar is provided with a first convex portion fitted to the control rail, and the needle bar guide is provided with a first concave portion corresponding to the first convex portion. In order to achieve mutual card integration and synchronous movement. The sewing machine needle bar switching device according to the second aspect of the invention, wherein the needle bar is provided with a concave portion fitted to the control rail, and the needle bar guide rod is provided with a convex portion corresponding to the concave portion to achieve mutual engagement. The purpose of synchronized motion. A sewing machine needle bar switching device according to the first aspect of the invention, wherein the needle bar holder and the needle bar guide are located on opposite sides of the needle bar. The sewing machine needle bar switching device of claim 5, wherein the needle bar is provided with a first convex portion and a second convex portion, and the needle bar guiding rod is provided with a first concave portion corresponding to the first convex portion, The purpose of the mutual engagement is synchronous movement, and the second convex portion is fitted into the control rail. According to the sewing machine needle bar switching device of claim 1, wherein the control guide rail is formed by recessing a groove or a groove in the surface of the needle bar holder, and the needle bar is provided with a corresponding groove or cut. The bump of the groove. According to the sewing machine needle bar switching device of claim 1, wherein the control rail is formed to protrude from the surface of the needle bar holder to form a ring flange, and the needle bar is set as a corresponding notch or a top. a stop above the ring flange. The sewing machine needle bar switching device according to the first aspect of the invention, wherein the plurality of needle bar holes of the needle bar are circumferentially arranged and rotated by the driving device to change the plurality of pin bar holes and the above The relative position between the needle bar guides. The sewing machine needle bar switching device according to the first aspect of the invention, wherein the plurality of needle bar holes of the needle bar are linearly arranged and linearly displaced by the driving device to change the plurality of pin bar holes and the above The relative position between the needle bar guides. According to the sewing machine needle bar switching device of claim 1, wherein the plurality of needle bar holes of the needle bar are arranged in an arc shape and are driven to be oscillated by the driving device to change the plurality of pin bar holes and The relative position between the above-mentioned needle bar guides.