CN209211062U - A kind of sewing machine and needle changing device thereof - Google Patents

Abstract

The utility model discloses a sewing machine and a needle changing device thereof, comprising: a needle bar assembly, a needle bar seat, a guide sleeve and a driving device. A plurality of guide holes are distributed along the circumferential direction of the guide sleeve, and the axis is parallel to the axis of the guide sleeve. Each guide hole is interspersed with a needle bar assembly, which slides up and down and is connected in the guide hole. The driving device is used to drive The guide sleeve rotates on the needle bar base, and the needle bar base is provided with a positioning part for limiting the rotation of the guide sleeve. When a certain needle bar assembly is needed, the guide sleeve is rotated by starting the driving device until the required needle bar assembly is rotated in place. At this time, the positioning part locks the rotation of the guide sleeve to improve the rotation accuracy of the guide sleeve, that is, The switching accuracy of the needle bar assembly is improved, wherein when switching the needle bar assembly, it only needs to start the driving device to control the rotation of the guide sleeve, so the needle replacement is relatively simple and convenient.

Description

A kind of sewing machine and needle changing device thereof

technical field

The utility model relates to the technical field of sewing machines, in particular to a needle changing device, and also relates to a sewing machine comprising the needle changing device.

Background technique

When existing sewing machines sew different colors of the same pattern, they usually use mold positioning to sew patterns of different colors on several pattern machines, or after sewing a pattern of one color on the same pattern machine, then Change the thread to sew a pattern of another color. The above-mentioned sewing method leads to low sewing efficiency, and in addition, due to the manufacturing and positioning errors of the mold, the pattern will be unattractive.

Therefore, how to provide a needle changing device for a sewing machine to improve sewing efficiency is a technical problem that those skilled in the art need to solve.

Utility model content

In view of this, an object of the present utility model is to provide a needle changing device, which can effectively improve the needle changing efficiency, and further improve the sewing efficiency, and another object is to provide a sewing machine including the above needle changing device.

In order to achieve the above object, the utility model provides the following technical solutions:

A needle changing device, comprising: a needle bar assembly, a needle bar base, a guide sleeve and a driving device, the guide sleeve is rotatably connected to the needle bar base, the guide sleeve is provided with a plurality of guide holes, and a plurality of The guide holes are distributed along the circumferential direction of the guide sleeve, and the axis is parallel to the axis of the guide sleeve. Each guide hole is inserted with a needle bar assembly, and the needle bar assembly is slidably connected up and down. In the guide hole, the driving device is used to drive the guide sleeve to rotate on the needle bar base, and the needle bar base is provided with a positioning component for limiting the rotation of the guide sleeve.

Preferably, the positioning component includes a positioning spring, a plug and positioning holes provided on the side wall of the guide sleeve, the number of the positioning holes is the same as the number of the guiding holes, and one end of the positioning spring is fixed on the On the needle bar seat, the other end is fixedly connected with the top, and the top extends into the positioning hole under the action of the positioning spring.

Preferably, the plug is a spherical plug.

Preferably, the needle bar seat is also provided with an adjusting screw for adjusting the preload of the positioning spring.

Preferably, the driving device includes a motor, a transmission shaft, a driving gear and a driven gear arranged on the outer wall of the guide sleeve, and the driven gear meshes with the driving gear.

Preferably, it also includes a drive sleeve that is slidably connected up and down on a plurality of the needle bar assemblies, the drive sleeve is provided with a drive ring, and the drive ring is rotatably connected with the drive sleeve, and the outer side of the drive ring The wall is provided with a driving rod extending along its axial direction.

Preferably, the needle bar assembly includes a needle bar sleeve, a needle chuck, a needle bar shaft, a telescopic spring, an upper ball and a lower ball, the needle chuck is fixed at the lower end of the needle bar sleeve, and the needle bar shaft Set in the needle bar sleeve, and the upper end protrudes from the needle bar sleeve, the two ends of the telescopic spring are pressed against the lower end of the needle bar shaft and the upper end of the needle chuck respectively, the needle The shaft is provided with an upper inclined surface with side walls tapered upwards and a lower inclined surface with side walls tapered downwards, and the needle bar sleeve is provided with an upper hole corresponding to the upper inclined surface and an upper hole corresponding to the lower inclined surface. Corresponding to the lower hole position, when the needle shaft moves upward, the upper ball protrudes from the upper hole position under the extrusion of the upper inclined surface, and the lower ball protrudes from the upper hole position under the pressure release of the lower inclined surface. Concave into the lower hole; when the needle bar shaft moves downward, the upper ball is concaved into the upper hole when the pressure is released on the upper slope, and the lower ball is on the lower slope. Squeeze and protrude from the lower hole, the bottom of the drive sleeve is provided with a lower bead groove, and when the upper ball protrudes from the upper hole, it will be inserted into the lower bead groove. The upper part of the guide hole is provided with an upper snapping ball groove, and the lower ball is snapped into the upper snapping ball groove when protruding from the lower hole.

Preferably, a limit plate is provided on the upper part of the needle bar seat, and the upper end of the needle bar shaft of the needle bar assembly to be converted is pressed against the bottom of the limit plate, and a through hole is provided on the limit plate , the needle bar shaft of the needle bar assembly that has been converted in place is released through the through hole, and the needle bar shaft moves upward under the action of the telescopic spring, and the upper ball is snapped into the lower snapping ball groove middle.

Preferably, the guide sleeve includes an upper guide sleeve and a lower guide sleeve, the upper bead groove is arranged on the guide hole of the lower guide sleeve, and the upper guide sleeve is located between the limit plate and the lower guide sleeve. between sets.

A sewing machine comprising the needle changing device described in any one of the above.

Compared with the prior art, the above-mentioned technical solution has the following advantages:

A sewing machine and a needle changing device provided by the utility model include: a needle bar assembly, a needle bar seat, a guide sleeve and a driving device, the guide sleeve is rotatably connected to the needle bar seat, and the guide sleeve is provided with a plurality of guide holes , a plurality of guide holes are distributed along the circumferential direction of the guide sleeve, and the axis is parallel to the axis of the guide sleeve. Each guide hole is inserted with a needle bar assembly, which slides up and down and is connected in the guide hole. The driving device is used for The driving guide sleeve is rotated on the needle bar base, and the needle bar base is provided with a positioning part for limiting the rotation of the guide sleeve. When a certain needle bar assembly is needed, the guide sleeve is rotated by starting the driving device until the required needle bar assembly is rotated in place. At this time, the positioning part locks the rotation of the guide sleeve to improve the rotation accuracy of the guide sleeve, that is, The switching accuracy of the needle bar assembly is improved, wherein when switching the needle bar assembly, the needle can be changed by controlling the rotation of the guide sleeve by starting the driving device, so the needle change is relatively simple and convenient.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description It is only an embodiment of the utility model, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a schematic diagram of the front structure of a needle changing device provided by a specific embodiment of the present invention;

Fig. 2 is a side view sectional structural schematic diagram of a needle changing device provided by a specific embodiment of the present invention;

Fig. 3 is a schematic cross-sectional structure diagram of a needle bar assembly of a needle changing device provided by a specific embodiment of the present invention;

Fig. 4 is a structural schematic diagram of a lower guide sleeve of a needle changing device provided by a specific embodiment of the present invention;

Fig. 5 is a structural schematic diagram of a driving sleeve of a needle changing device provided by a specific embodiment of the present invention.

The reference signs are as follows:

1 is the needle bar seat, 2 is the lower guide sleeve, 3 is the drive sleeve, 4 is the drive rod, 5 is the fixed sleeve, 6 is the upper guide sleeve, 7 is the needle bar assembly, 7.1 is the needle bar cover, 7.2 is the needle chuck , 7.3 is the fixing screw, 7.4 is the positioning support pin, 7.5 is the telescopic spring, 7.6 is the needle bar shaft, 7.7 is the upper ball, 7.8 is the guide cylinder, 7.9 is the lower ball, 8 is the installation screw, 9 is the limit plate, 9.1 is a through hole, 10 is a motor, 11 is a transmission shaft, 12 is a driving gear, 13 is a connecting screw, 14 is a fastening screw, 15 is a plug, 16 is a positioning spring, 17 is an adjusting screw, 18 is a guide hole, and 19 is a On the bead groove, 20 is a positioning hole, and 21 is the lower bead groove.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Figure 1-Figure 5, Figure 1 is a schematic diagram of the front structure of a needle changing device provided by a specific embodiment of the present invention; Figure 2 is a schematic diagram of a needle changing device provided by a specific embodiment of the present invention Schematic diagram of the cross-sectional structure of the needle device in side view; Fig. 3 is a schematic diagram of the cross-sectional structure of the needle bar assembly of a needle changing device provided by a specific embodiment of the present invention; Fig. 4 is a specific embodiment of the present invention A structural schematic diagram of a lower guide sleeve of a needle changing device provided; FIG. 5 is a structural schematic diagram of a driving sleeve of a needle changing device provided by a specific embodiment of the present invention.

A needle changing device provided by the embodiment of the utility model includes: a needle bar assembly 7, a needle bar seat 1, a guide sleeve and a driving device. For structures with different diameters, the small end is rotationally connected with the needle bar base 1, and the large end is located on the needle bar base 1 to limit the axial movement of the guide sleeve. The guide sleeve is provided with multiple guide holes 18, and multiple guide holes 18 are arranged on the guide sleeve. The holes 18 are distributed along the circumferential direction of the guide sleeve, and the axis and the axis of the guide sleeve are parallel to each other, wherein the guide holes 18 are preferably evenly distributed around the axis of the guide sleeve, and each guide hole 18 is inserted with a needle bar assembly 7, and the needle bar assembly 7 is slidingly connected in the guide hole 18 up and down, and the driving device is used to drive the guide sleeve to rotate on the needle bar base 1, and the needle bar base 1 is provided with a positioning part for limiting the rotation of the guide sleeve. When a certain needle bar assembly 7 is needed, the guide sleeve is rotated by starting the driving device until the required needle bar assembly 7 is rotated in place. At this time, the positioning part locks the rotation of the guide sleeve to improve the rotation accuracy of the guide sleeve. , that is, the switching accuracy of the needle bar assembly 7 is improved, wherein when switching the needle bar assembly 7, the needle can be changed by starting the driving device to control the rotation of the guide sleeve, so the needle change is relatively simple and convenient.

Further, the positioning component includes a positioning spring 16 and a top 15 and a positioning hole 20 arranged on the side wall of the guide sleeve, wherein the top 15 is preferably a spherical top 15, the number of the positioning holes 20 is the same as the number of the guide holes 18, and the positioning spring 16 One end of which is fixed on the needle bar base 1, wherein a slot hole can be set on the side wall of the mounting hole for the guide sleeve to be rotatably connected on the needle bar base 1, and this end of the positioning spring 16 is pressed against the inside of the slot hole. The other end of the positioning spring 16 is fixedly connected to the plug 15 , and the plug 15 extends into the positioning hole 20 under the action of the positioning spring 16 . When being a spherical plug 15, when the guide sleeve rotates to a desired position, the spherical plug 15 can automatically stretch into the positioning hole 20, and when the guide sleeve is rotated again, the spherical plug 15 can automatically slide out from the positioning hole 20, so it can be Realize the purpose of automatic positioning, and then improve the efficiency of needle replacement.

Furthermore, an adjusting screw 17 for adjusting the preload of the positioning spring 16 is also provided on the needle bar base 1 . Wherein the above-mentioned slot is preferably a through hole 9.1, and the adjusting screw 17 can be screwed into the slot from the outside, and one end of the spring is pressed against the adjusting screw 17, and as the adjusting screw 17 is screwed in, the pre-tightening force of the positioning spring 16 is increased. Big,

Specifically, the driving device includes a motor 10 , a transmission shaft 11 , a driving gear 12 and a driven gear arranged on the outer wall of the guide sleeve, and the driven gear meshes with the driving gear 12 . Wherein the driven gear can be arranged on the outer wall of the large end of the guide sleeve, and the driving gear 12 and the driven gear can be fixed by connecting screws 13. Secondly, the preferred stepping motor of the motor 10 can always rotate in one direction or reciprocate turn. It should be noted that driving the guide sleeve to rotate through gears is only a preferred method, and other driving methods can also be used to drive, depending on the specific circumstances.

A needle changing device provided in an embodiment of the present utility model also includes a drive sleeve 3 that is slidably connected up and down on a plurality of needle bar assemblies 7, and a drive ring is provided over the drive sleeve 3, and the drive ring and the drive sleeve 3 are connected in rotation, and the outer wall of the drive ring is provided with a drive rod 4 extending along its axial direction. The drive rod 4 can follow the drive ring to rotate on the drive sleeve 3. In addition, in order to prevent the drive ring from moving axially on the drive sleeve 3, the drive sleeve 3 is provided with a shaft shoulder. After the drive ring is set on the drive sleeve 3, it passes The shaft shoulder is limited, and then the fixed sleeve 5 is sleeved to limit the movement of the drive ring from the axial direction, wherein the fixed sleeve 5 can be fixed on the drive sleeve 3 by the fastening screw 14 . Because the drive ring is rotatably connected to the drive sleeve 3, the drive rod 4 does not rotate with the rotation of the needle bar's rotating assembly, so after multiple needle changes, the position of the drive rod 4 can remain unchanged.

Further, the needle bar assembly 7 includes a needle bar cover 7.1, a needle chuck 7.2, a needle bar shaft 7.6, a telescopic spring 7.5, an upper ball 7.7 and a lower ball 7.9, and the needle chuck 7.2 is fixed on the lower end of the needle bar cover 7.1, specifically The positioning support pin 7.4 can be set at the lower end of the needle bar sleeve 7.1, and the positioning support pin 7.4 can be fixed on the needle bar sleeve 7.1 through the fixing screw 7.3 radially penetrating through the needle bar sleeve 7.1 and the positioning support pin 7.4, and the needle chuck 7.2 is clamped from the bottom On the positioning support pin 7.4, the needle bar shaft 7.6 is sleeved in the needle bar sleeve 7.1, and the upper end protrudes from the needle bar sleeve 7.1. In order to facilitate the sliding of the upper end of the needle bar shaft 7.6, it can be set inside the upper end of the needle bar sleeve 7.1 The two ends of the guide cylinder 7.8 and the telescopic spring 7.5 are respectively pressed against the lower end of the needle bar shaft 7.6 and the upper end of the needle chuck 7.2, specifically can be pressed against the upper end of the positioning support pin 7.4, and the needle bar shaft 7.6 is provided with a side wall The upper inclined surface that tapers upward and the lower inclined surface that tapers downward on the side wall, wherein the upper inclined surface and the lower inclined surface are preferably conical surfaces, and the needle bar sleeve 7.1 is provided with an upper hole corresponding to the upper inclined surface and a corresponding hole corresponding to the lower inclined surface. Corresponding to the lower hole position, when the needle bar shaft 7.6 moves upward, the upper ball 7.7 protrudes from the upper hole position under the extrusion of the upper inclined surface, and the lower ball 7.9 is concaved into the lower hole position when the lower inclined surface is released; the needle bar shaft 7.6 When moving downward, the upper ball 7.7 is concaved into the upper hole when the pressure is released on the upper slope, and the lower ball 7.9 protrudes out of the lower hole under the extrusion of the lower slope. When the upper ball 7.7 protrudes from the upper hole, it is inserted into the lower bead groove 21. The upper part of the guide hole 18 is provided with an upper bead groove 19. When the lower ball 7.9 protrudes from the lower hole, it is inserted into the upper bead groove 19. . Wherein the number of the upper ball 7.7 and the lower ball 7.9 can be multiple, preferably uniformly distributed along the circumferential direction of the needle bar sleeve 7.1.

Further, the upper part of the needle bar base 1 is provided with a limit plate 9, specifically the needle bar base 1 includes a bottom plate, a vertical plate and a top plate, and the upper and lower ends of the vertical plate are respectively fixed on the sides of the bottom plate and the top plate, that is, the top plate constitutes the above-mentioned limit plate. Position plate 9, wherein the limit plate 9 can be fixed on the vertical plate of the needle bar seat 1 by the mounting screw 8, the upper end of the needle bar shaft 7.6 of the needle bar assembly 7 to be converted is pressed against the bottom of the limit plate 9, and the limit A through hole 9.1 is provided on the position plate 9, and the needle bar shaft 7.6 of the needle bar assembly 7 that has been converted in place is released through the through hole 9.1. Put it into the lower bead groove 21. Through the through hole 9.1 provided on the limit plate 9, the converted needle bar assembly 7 can automatically move downwards, and at the same time, the automatic clamping of the needle bar assembly 7 and the driving sleeve 3 can be realized, so the conversion efficiency can be improved.

Specifically, the guide sleeve includes an upper guide sleeve 6 and a lower guide sleeve 2 , the upper bead groove 19 is arranged on the guide hole 18 of the lower guide sleeve 2 , and the upper guide sleeve 6 is located between the limiting plate 9 and the lower guide sleeve 2 . That is, the needle bar seat 1 has an E-shaped structure, the lower guide sleeve 2 is arranged at the bottom of the needle bar seat 1, the upper guide sleeve 6 is arranged at the middle of the needle bar seat 1, and the outer side of the upper guide seat is also provided with a driven gear, and the corresponding transmission shaft 11 is also provided with a driving gear 12, so the two driven gears can realize synchronous rotation to improve the stability of the conversion of the needle bar assembly 7.

An embodiment of the present invention also provides a sewing machine, including the needle changing device provided in any one of the above embodiments. Its beneficial effects can be referred to the above-mentioned needle changing device, and will not be repeated here.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The sewing machine and the needle changing device thereof provided by the utility model have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present utility model, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made to the utility model, and these improvements and modifications also fall into the protection of the claims of the utility model. within range.

Claims (10)

1. A needle changing device, characterized in that it comprises: a needle bar assembly, a needle bar seat, a guide sleeve and a driving device, the guide sleeve is rotatably connected to the needle bar seat, and the guide sleeve is provided with multiple a plurality of guide holes, a plurality of guide holes are distributed along the circumferential direction of the guide sleeve, and the axes are parallel to the axis of the guide sleeve, each of the guide holes is inserted with a needle bar assembly, and The needle bar assembly is slidingly connected in the guide hole up and down, and the driving device is used to drive the guide sleeve to rotate on the needle bar base, and the needle bar base is provided with a positioning device for limiting the rotation of the guide sleeve. part. 2. The needle changing device according to claim 1, wherein the positioning member comprises a positioning spring, a plug and positioning holes arranged on the side wall of the guide sleeve, and the number of the positioning holes is the same as that of the guide sleeve. The number of holes is the same, one end of the positioning spring is fixed on the needle bar seat, and the other end is fixedly connected with the plug, and the plug extends into the positioning hole under the action of the positioning spring. 3. The needle changing device according to claim 2, wherein the plug is a spherical plug. 4. The needle exchanging device according to claim 3, wherein an adjusting screw for adjusting the preload of the positioning spring is further provided on the needle bar seat. 5. The needle changing device according to claim 4, wherein the driving device comprises a motor, a drive shaft, a driving gear, and a driven gear arranged on the outer wall of the guide sleeve, and the driven gear is connected to the driven gear. The drive gear meshes. 6. The needle changing device according to any one of claims 1 to 5, further comprising a drive sleeve that is slidably connected up and down on a plurality of needle bar assemblies, and a drive ring is provided outside the drive sleeve , the drive ring is rotatably connected to the drive sleeve, and a drive rod extending along the axial direction of the drive ring is provided on the outer wall of the drive ring. 7. The needle changing device according to claim 6, wherein the needle bar assembly comprises a needle bar cover, a needle chuck, a needle bar shaft, a telescopic spring, an upper ball and a lower ball, and the needle chuck is fixed At the lower end of the needle bar cover, the needle bar shaft is sleeved in the needle bar cover, and the upper end protrudes from the needle bar cover, and the two ends of the telescopic spring are pressed against the needle bar shaft respectively. The lower end of the needle chuck and the upper end of the needle chuck, the needle bar shaft is provided with an upper inclined surface with side walls tapered upwards and a lower inclined surface with side walls tapered downwards, and the needle bar sleeve is provided with the upper The upper hole position corresponding to the inclined surface and the lower hole position corresponding to the lower inclined surface, when the needle shaft moves upward, the upper ball protrudes from the upper hole under the extrusion of the upper inclined surface position, the lower ball is recessed into the lower hole when the pressure is released on the lower slope; when the needle shaft moves downward, the upper ball is concaved into the The upper hole position, the lower ball protrudes from the lower hole position under the extrusion of the lower slope, the bottom of the drive sleeve is provided with a lower ball groove, and the upper ball protrudes from the upper hole The upper part of the guide hole is provided with an upper snapping ball slot, and the lower ball protrudes from the lower hole position and snaps into the upper snapping ball slot. 8. The needle exchanging device according to claim 7, characterized in that a limit plate is provided on the upper part of the needle bar seat, and the upper end of the needle bar shaft of the needle bar assembly to be converted is pressed against the limit plate. At the bottom of the plate, the limit plate is provided with a through hole, the needle bar shaft of the needle bar assembly that has been shifted in place is released through the through hole, and the needle bar shaft goes upward under the action of the telescopic spring. Move, the upper ball snaps into the lower snap ball groove. 9. The needle changing device according to claim 8, wherein the guide sleeve comprises an upper guide sleeve and a lower guide sleeve, the upper bead groove is arranged on the guide hole of the lower guide sleeve, and the The upper guide sleeve is located between the limiting plate and the lower guide sleeve. 10. A sewing machine, characterized in that it comprises the needle changing device according to any one of claims 1 to 9.