TWI652387B - A transmission device for up and down movement of needle bar - Google Patents

Abstract

The transmission device of the needle bar up and down movement of the invention comprises a transmission member and a coupling member, the transmission member has an opening for the needle of the sewing machine to be inserted, and is driven by the needle bar driving handle to generate an up-and-down displacement; and the connecting member has a needle for the needle The rod is threaded with a fixed connection and held in contact with the transfer member, and the joint member and the transfer member together form a ball joint capable of generating a relative offset movement. When the spindle drives the needle bar drive handle to operate, the needle bar will be transmitted by the transmission device to transmit only the thrust of the up and down movement, which can prevent other lateral forces from acting on the swing mechanism of the needle bar, thereby preventing the precision of the sewing machine from being lowered under high speed sewing, and Effectively simplifying the construction of the transfer device.

Description

Needle bar up and down movement transmission device

The invention relates to a keyhole sewing machine capable of swinging a needle bar and moving up and down, in particular to a transmission device capable of reducing lateral force when the needle bar swings up and down.

The needle bar movement of the conventional round buttonhole machine has the rotation motion of the rotation and the horizontal direction in addition to the up and down movement of the general sewing machine. The swing center of the needle bar is disposed at the substantially upper end of the needle bar, and can be moved up and down. The movable ground is supported on the frame, and a needle swing mechanism is arranged at the lower end of the needle bar to drive the lower end of the needle bar to swing horizontally; and a needle bar frame is connected at the middle of the needle bar to receive the needle bar driven from the spindle. The crank drives the needle bar frame for up and down movement.

When the keyhole sewing machine drives the spindle to rotate, the crank transmission device formed by the crank lever driven by the needle bar crank moves the needle bar up and down, and the needle swing mechanism performs a swinging motion, so that the cloth placed on the feeding table can form a round head. The zigzag stitch of the keyhole.

A known keyhole machine is disclosed in Chinese Patent Publication No. CN 1824872, wherein the up and down motion transmission device is composed of a yoke member, a first fulcrum, an annular member, a second fulcrum and a pair of needle bar frame members. The yoke member is rotatably supported on the needle bar crank through a first fulcrum horizontally orthogonal to the needle bar; the annular member has a space formed by the annular inner peripheral surface, and is formed by the needle bar A gap for swinging is ensured between the outer peripheral surface and the inner peripheral surface of the annular member; further, the second fulcrum will be orthogonal The first support shaft and the shaft center of the needle bar are arranged such that the annular member is rotatably supported on the yoke member; finally, the two needle bar frame members are fixed on the outer side of the needle bar and disposed on the upper and lower sides of the ring member On both sides.

The main object of the present invention is to provide a transmission device for the up and down movement of a needle bar of a sewing machine, which can prevent the other lateral forces from acting on the needle bar swinging mechanism while performing the swinging motion and the up and down movement, thereby effectively simplifying the structure of the transmission device. Avoid distortion of the zigzag stitches.

In order to achieve the above object, the transfer device of the present invention is mainly mounted on a needle bar driven by a swing mechanism in a sewing machine, and the transfer device is further coupled with a needle bar drive handle, and the needle bar drive shaft is driven by a spindle of the sewing machine. The transfer device and the needle bar are driven to move up and down in synchronization with the needle bar drive handle.

Further, the transfer device includes a transfer member having an opening through which the needle bar is inserted, and the needle bar drive handle is coupled to the needle bar drive handle so that the transfer member can be displaced by the needle bar drive handle to generate upper and lower displacements. And the connecting member has a connecting portion for the needle rod to be fixedly fixed, and is held in contact with the transmitting member, and the connecting member and the transmitting member together form a spherical joint capable of generating a relative offset movement, thereby simplifying the transfer device. The structure can further reduce the manufacturing cost of the sewing machine.

The opening diameter of the transmission member is larger than the outer diameter of the needle bar, so that a swing gap is formed between the outer circumferential surface of the needle bar and the inner circumferential surface of the opening.

In the first preferred embodiment, the transmitting member is configured as a spherical body, and the connecting member is configured with a spherical space formed by the upper and lower needle bar frames, so that the spherical body can be accommodated in the spherical space. For relative spherical motion.

Further, the transfer member includes two spaced apart hemispherical portions and an annular portion disposed between the two hemispherical portions, and the two hemispherical portions are capable of generating a relative level with the annular portion when restrained by the two needle bar holders. Displacement. Further, the annular portion is respectively provided with a sleeve at two opposite side positions, and the two sleeves are respectively attached to the needle bar driving handle through a connecting pin group.

The needle bar frame is formed with a semi-spherical groove at a position adjacent to the transmitting member, and a locking portion is formed at a position away from the transmitting member; and the locking portion includes a tightening ring forming a two-clamping arm and a wearing A screw provided on the two clamping arms to change the inner diameter of the tightening ring.

When the needle bar is driven by the needle pendulum mechanism to swing, the hemispherical groove of the needle bar frame is tilted obliquely with the needle bar, and the hemispherical surface of the transmitting member is not inclined with the needle bar, only The needle bar is offset, which causes a relative spherical rotation between the hemispherical groove and the hemispherical surface, and the hemispherical surface is abutted by the hemispherical groove, so that the hemispherical surface and the annular portion are generated. Relative horizontal offset.

In the second preferred embodiment, the transmitting member is configured with a spherical space, and the connecting member is configured as a spherical body, and the spherical body can be accommodated in the spherical space for relative spherical motion.

The transmission member includes a connecting frame and two hemispherical concave cups constituting the spherical space, the connecting frame is formed with an accommodating space for accommodating the connecting member; the two hemispherical concave cups are disposed in the accommodating space and are respectively located The opposite sides of the connecting member; wherein the two hemispherical concave cups are capable of being displaced relative to the connecting frame when the connecting member is biased.

The connecting frame is respectively formed with an opening at the upper and lower ends, and a pivot hole is formed on each of the left and right sides, and the two pivot holes are respectively mounted on the needle bar driving handle through a connecting pin group.

In a possible embodiment, the connecting member is composed of a single spherical body, and the single spherical body has a positioning portion for bolting, so that the single spherical body can be locked to the outside of the needle bar; In a possible embodiment, the connecting member includes two hemispheres that together form the spherical body and at least one screw that locks the two hemispheres to the outside of the needle bar.

In addition, the transfer device further includes a guiding mechanism mounted on the inside of the sewing machine and having at least one guiding rail fitted with the transmitting member, so that the transmitting member is restricted by the guiding rail The vertical displacement in the vertical direction is performed.

In a possible embodiment, the guiding mechanism comprises a first bracket and a second bracket, wherein the first bracket and the second bracket are respectively located on opposite sides of the transmitting member, and the first bracket has a plurality of connecting arms And being mounted to the at least one support shaft of the second bracket by the plurality of connecting arms.

The invention is characterized in that the transmission device is formed by the two needle bar holders by the transmission member, and a spherical joint capable of forming a 360 degree swing between the transmission member and the two needle bar holders is provided, thereby allowing the transmission device to drive the needle bar up and down. During the movement, it is possible to prevent other lateral forces from acting on the swinging mechanism of the needle bar, and to prevent the sewing machine from interfering with the swinging amount of the needle bar in the high-speed sewing state, thereby affecting the dimensional accuracy of the needle bar swinging amplitude.

10‧‧‧Sewing machine

11‧‧‧ Needle bar

12‧‧‧ Spindle

13‧‧‧ Needle bar support table

14‧‧‧Needing mechanism

15‧‧‧ cam

16‧‧‧ Needle bar drive handle

161‧‧‧Connecting Department

20‧‧‧Transfer device

21‧‧‧Transmission components

211‧‧‧hemispherical face

211a‧‧‧Opening

212‧‧‧Rings

212a‧‧‧Opening

213‧‧‧Spheroids

214‧‧‧ casing

215‧‧‧Connection pin group

216‧‧‧ Slider

217‧‧‧ swing gap

218‧‧‧Connection box

218a‧‧‧ accommodation space

218b‧‧‧ opening

218c‧‧‧ pivot hole

219‧‧‧hemispherical concave cup

219a‧‧‧Opening

210‧‧‧Connection pin

22‧‧‧Connected components

221‧‧‧ needle bar holder

222‧‧‧Connecting Department

223‧‧‧Locking Department

224‧‧‧hemispherical grooves

225‧‧‧Hoops

226‧‧‧ clip arm

227‧‧‧ screws

228‧‧‧Spheroid

229‧‧‧ Positioning Department

220‧‧‧ bolt

23‧‧‧Guide

231‧‧‧ guided orbit

232‧‧‧First bracket

233‧‧‧second bracket

234‧‧‧Connecting arm

235‧‧‧Support shaft

Figure 1 is a perspective view of the head of the sewing machine of the present invention; 2 is a perspective view of the transmission device for the up and down movement of the needle bar in the sewing machine of the present invention; FIG. 3 is a cross-sectional view of the line AA of FIG. 2; FIG. 4 is an exploded view of the transmission device for the up and down movement of the needle bar of the present invention; 4 is an exploded view of the transfer member and the needle bar frame; FIG. 6 is a schematic view showing the up and down movement of the needle bar mechanism of the present invention; FIGS. 7A to 7B are schematic views showing the swinging stroke of the needle bar mechanism of the present invention; FIG. 9 is a cross-sectional view of a line BB of FIG. 8; FIG. 10 is an exploded view of a second embodiment of the transmission apparatus of the present invention; and FIGS. 11A to 11B are swinging strokes of a second embodiment of the present invention; Schematic diagram.

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 1, the keyhole sewing machine of the present invention 10 is internally mounted with a needle bar 11 and a spindle 12, wherein the upper end of the needle bar 11 is provided with a needle bar support table 13 assembled to the casing of the sewing machine 10, and the lower end portion of the needle bar 11 is mounted with a drive motor ( The figure shows a needle swing mechanism 14 that is driven.

Referring to FIG. 2 and FIG. 3, a spindle 15 is coupled to one end of the spindle 12, and a needle bar driving handle 16 is connected by the cam 15 at another axial position parallel to the axis of the spindle 12. The driving handle 16 has a connecting portion 161 extending in the horizontal direction, and a connecting device 20 connected to the needle bar 11 is attached by the connecting portion 161.

Referring to FIG. 4 and FIG. 5, the transmission device 20 of the present invention comprises a transmission member 21, a coupling member 22 and a guiding mechanism 23. In the first preferred embodiment, the transmission member 21 has Two spaced apart hemispherical portions 211 and an annular portion 212 disposed between the two hemispherical portions 211, and the two hemispherical portions 211 and the annular portion 212 are configured together to form a spherical body 213, and the two hemispherical surfaces 211 and the annular portion 212 are respectively formed with an opening 211a, 212a in the direction in which the needle bar 11 is inserted for the needle bar 11 to penetrate, and the annular portion 212 is respectively provided with a sleeve 214 at two opposite side positions. The two sleeves 214 are respectively mounted on the needle bar driving handle 16 through a connecting pin set 215, so that the transmitting member 21 can cooperate with the needle bar driving handle 16 to synchronously shift up and down, and the connecting pin set 215 is further provided with a matching. The above-described guiding mechanism 23 limits the slider 216 in the moving direction.

In a possible embodiment, the apertures of the plurality of openings 211a, 212a must be larger than the outer diameter of the needle bar 11, so that the outer circumferential surface of the needle bar 11 and the inner circumferential surface of each opening 211a, 212a have a sufficient swing gap 217; wherein a gap between the needle bar 11 and the opening 211a is a position for allowing the yaw angle of the needle bar 11, and a gap between the needle bar 11 and the opening 212a is to allow the needle bar 11 yaw angle plus horizontal displacement of the yield, so in actual use, the aperture of the opening 212a needs to be larger than the aperture of the opening 211a.

Referring to FIG. 4 and FIG. 5 again, the connecting member 22 of the present invention is designed as two needle bar holders 221 fixed to the outer surface of the needle bar 11, and the two needle bar holders 221 are respectively adjacent to the top and bottom of the transmitting member 21. The opposite side of the needle bar holder 221 is provided with a connecting portion 222 formed in a perforated manner along the direction in which the needle bar 11 is inserted, and the needle bar frame 221 forms a lock at a position away from the transmitting member 21. The portion 223 is formed with a semi-spherical groove 224 at a position adjacent to the transfer member 21 described above.

In the possible embodiment of the drawings, the hemispherical grooves 224 of the two needle bar holders 221 will form a spherical space to accommodate the spherical body 213 of the transmitting member 21, so that the spherical body 213 can be in the ball. Relative spherical motion in the space, so that the two needle bar holders 221 and the transmission member 21 are three Together, a spherical joint is formed, which simplifies the construction of the transfer device 20, thereby reducing the manufacturing cost of the sewing machine.

Furthermore, the locking portion 223 includes a tightening ring 225 forming two clamping arms 226 and a screw 227 extending through the two clamping arms 226 to change the inner diameter of the fastening ring 225, so that the user can quickly install The needle bar holder 221 can be adapted to the wear of the transmission member 21, and the combined gap between the two needle bar holders 221 and the transmission member 21 can be conveniently adjusted. Further, the locking portion 223 can also be connected to the hemispherical groove 224. Integral, the number of components can be further simplified.

Referring to FIG. 1 and FIG. 4, the guiding mechanism 23 of the present invention has at least one guiding rail 231 mounted with the slider 216. As shown, the guiding rail 231 of the present invention extends in the up and down direction. A linear limit chute restricts the slider 216 from being vertically displaced in the vertical direction, thereby receiving the lateral force generated when the needle bar driving handle 16 pushes the annular portion 212 up and down to avoid the lateral direction. The force interferes with the swing of the needle bar 11.

In a possible embodiment, the guiding mechanism 23 has a first bracket 232 and a second bracket 233 respectively located on opposite sides of the transmitting member 21, and the first bracket 232 is located at two sides of the upper end and the lower end. A connecting arm 234 corresponding to the length of the connecting portion 161 is formed respectively, and the second bracket 233 is respectively provided with a supporting shaft 235 corresponding to the connecting arm 234 at the upper end and the lower end, and is mounted on the supporting shaft 235 by the supporting shaft 235 Above the sewing machine 10.

Referring to FIG. 6, when the spindle 12 drives the needle bar driving handle 16 to operate, the transmitting device 20 is driven by the needle bar driving handle 16 to move up and down, because the needle bar 11 and the needle bar driving handle 16 are The connection is such that the needle bar 11 described above will move up and down in synchronism with the transfer device 20 described above.

Referring to FIG. 7A and FIG. 7B, in addition, the needle swing mechanism 14 can drive the needle bar 11 to perform a horizontal swing motion while the transfer device 20 moves up and down, so that the keyhole sewing machine can be A tortuous stitch is produced on the sewn fabric.

When the needle bar 11 is driven by the above-described needle swing mechanism 14, the hemispherical groove 224 of the needle bar frame 221 is inclined with the needle bar 11 in synchronization with the needle bar 11, and the hemispherical surface portion 211 of the transmission member 21 is not As the needle bar 11 is tilted, only the needle bar 11 is offset, which causes a relative spherical rotation between the hemispherical groove 224 and the hemispherical portion 211; and the two hemispherical portions 211 are subjected to the two hemispherical grooves 224. Limiting the topping, in addition to causing a relative horizontal shift between the hemispherical surface portion 211 and the annular portion 212, the two hemispherical portions 211 may be held in a concentric spherical structure at any time; finally, the two needle bar holders 221 A vertical displacement can be generated when the annular portion 212 is pushed up and down by the two hemispherical portions 211.

Referring to FIG. 8 to FIG. 10, in the second preferred embodiment, the transmission member 21 of the present invention is designed with a substantially square-shaped connecting frame 218 and two hemispherical concave cups 219, wherein the connecting frame 218 is centrally An accommodating space 218a for accommodating the connecting member 22 is formed, and an opening 218b for receiving the needle bar 11 is formed on the upper and lower ends, and a pivot hole 218c is formed on the left and right sides, respectively. The pivot holes 218c are respectively attached to the needle bar driving handle 16 through a set of connecting pins 210.

Further, the two hemispherical concave cups 219 have an opening 219a, and are disposed in the receiving space 218a, respectively located on opposite sides of the connecting member 22 to form a spherical space, and the two hemispherical concave cups 219 are When the yaw action of the connecting member 22 is received, a relative displacement can be generated with the connecting frame 218.

In addition, the connecting member 22 is designed as a spherical body 228 that can be accommodated in the spherical space for relative spherical movement. In a preferred embodiment, the connecting member 22 has a single spherical shape. The body 228 is configured such that the single spherical body 228 has a positioning portion 229 for assembling the bolts 220, so that the single spherical body 228 can be locked to the outside of the needle bar 11.

In another possible embodiment, the connecting member 22 may further include two hemispheres that together form the spherical body 228 and at least one screw member that locks the two hemispheres to the outside of the needle bar 11 (not shown). ). However, this is only for convenience of illustration and does not limit the structural form of the above-described joint member 22.

Referring to FIGS. 11A and 11B, when the needle bar 11 is rotated by the needle swing mechanism 14, the spherical body 228 of the connecting member 22 will be tilted with the needle bar 11 in synchronization with the yaw. The connecting frame 218 of the transmitting member 21 does not yaw with the needle bar 11, which causes a relative spherical rotation between the two hemispherical concave cups 219 of the transmitting member 21 and the spherical body of the connecting member 22; The horizontal displacement between the two hemispherical concave cups 219 and the connecting frame 218 is caused, so that the spherical space formed by the two hemispherical concave cups 219 is kept in a concentric manner; finally, the spherical body 228 will When the above-mentioned connecting frame 218 pushes the above-mentioned two hemispherical concave cups 219, the displacement in the vertical direction can be simultaneously generated.

The above-mentioned embodiments are merely intended to be illustrative of the present invention and are not intended to limit the scope of the invention, and the various modifications and modifications made by those skilled in the art in accordance with the scope of the invention and the description of the invention are still It is included in the scope of the following patent application.

Claims (13)

The utility model relates to a transmission device for up and down movement of a needle bar, which is mounted on a needle bar driven by a needle pendulum mechanism in a sewing machine, and is moved up and down in conjunction with a needle bar driving handle assembled to the spindle, comprising: a transmission member having a needle rod for wearing The insertion hole is connected to the needle bar driving handle, and is driven by the needle bar driving handle to generate an upper and lower displacement; the connecting member has a connecting portion for the needle bar to be fixedly fixed, and is kept in contact with the transmitting member; The connecting member and the transmitting member together form a spherical joint capable of generating a relative yaw motion, and the transmitting member has two spaced apart hemispherical portions and an annular portion disposed between the two hemispherical portions. The two hemispherical surface portions are offset from the annular portion in a horizontal direction when subjected to the yaw action of the connecting member, and the two hemispherical portions are maintained in a concentric spherical structure. The transmission device for moving up and down the needle bar according to the first aspect of the invention, wherein the opening diameter of the transmission member is larger than the outer diameter of the needle bar, so that the outer circumferential surface of the needle bar and the inner circumferential surface of the opening A swing gap is formed between them. The transfer device for moving up and down the needle bar according to the first aspect of the invention, wherein the two hemispherical portions and the annular portion are jointly formed as a spherical body, and the connecting member is configured with a spherical space, so that the spherical body can It is accommodated in the spherical space for relative spherical motion. The transmission device for moving up and down the needle bar according to the first aspect of the invention, wherein the annular portion is respectively provided with a sleeve at two opposite side positions, and the two sleeves are respectively mounted on the needle bar through a connecting pin group. Drive handle. The transmission device for moving the needle bar up and down as described in claim 3, wherein the connecting member comprises two needle bar frames respectively adjacent to opposite sides of the transmitting member, the needle bar frame being A semi-spherical groove is formed at a position adjacent to the transfer member, and a lock portion is formed at a position away from the transfer member. The transmission device of the needle bar up and down movement according to the first aspect of the invention, wherein the transmission device further comprises a guiding mechanism, wherein the guiding mechanism is mounted inside the sewing machine and has at least one fitting with the transmitting member The guide rail is such that the transmission member is restricted by the guide rail and vertically displaced in the vertical direction. The transmission device of the needle bar up and down movement according to the sixth aspect of the invention, wherein the guiding mechanism comprises a first bracket and a second bracket, wherein the first bracket and the second bracket are respectively located at opposite sides of the transmitting member And the first bracket has a plurality of connecting arms, and is mounted on the at least one supporting shaft of the second bracket by the plurality of connecting arms. The utility model relates to a transmission device for up and down movement of a needle bar, which is mounted on a needle bar driven by a needle pendulum mechanism in a sewing machine, and is moved up and down in conjunction with a needle bar driving handle assembled to the spindle, comprising: a transmission member having a needle rod for wearing The insertion hole is connected to the needle bar driving handle, and is driven by the needle bar driving handle to generate an upper and lower displacement; the connecting member has a connecting portion for the needle bar to be fixedly fixed, and is kept in contact with the transmitting member; The connecting member and the transmitting member together form a spherical joint capable of generating a relative yaw motion, the transmitting member has a connecting frame and two hemispherical concave cups, and the connecting frame forms a receiving space for accommodating the connecting member. The two hemispherical concave cups are disposed in the accommodating space and are respectively located on opposite sides of the connecting member, and the two hemispherical concave cups are configured with a spherical space, and the two hemispherical concave cups are biased by the connecting member When the pendulum acts, it can be offset from the above-mentioned connecting frame by a horizontal direction, so that the above two hemispherical concave cups are formed Concentric spherical holding space like state. The transmission device for moving up and down the needle bar according to the eighth aspect of the invention, wherein the connecting member is configured as a spherical body, and the spherical body can be accommodated in the spherical space for relative spherical motion. The transmission device for moving up and down the needle bar according to Item 8 of the patent application, wherein the connecting frame is formed with an opening for accommodating the needle bar at the upper and lower ends, and a pivot is formed on the left and right sides respectively. The hole is connected, and the two pivot holes are respectively mounted to the needle bar driving handle through a connecting pin group. The transmission device of the needle bar up and down movement according to claim 9, wherein the connecting member is composed of a single spherical body, and the single spherical body has a positioning portion for bolting, so that the single spherical body It can be locked to the outside of the needle bar. The transfer device of the needle bar up and down movement according to the eighth aspect of the invention, wherein the transfer device further comprises a guiding mechanism, the guiding mechanism being mounted inside the sewing machine and having at least one fitting with the transmitting member The guide rail is such that the transmission member is restricted by the guide rail and vertically displaced in the vertical direction. The transmission device for the up and down movement of the needle bar according to claim 12, wherein the guiding mechanism comprises a first bracket and a second bracket, wherein the first bracket and the second bracket are respectively located at opposite sides of the transmitting member And the first bracket has a plurality of connecting arms, and is mounted on the at least one supporting shaft of the second bracket by the plurality of connecting arms.