CN217479703U - Lift presser foot, trimming and gauge needle link gear and sewing machine - Google Patents

Abstract

The utility model discloses a presser foot lifting, thread cutting and stitch length linkage mechanism and a sewing machine in the technical field of sewing machine transmission, which comprises a transverse motor; the driving cam is in transmission connection with the transverse motor and is provided with a single lifting and pressing section, an adjusting section and a shearing section; the single pressure lifting section is in transmission fit with the pressure lifting shaft, and the pressure lifting shaft can be driven to rotate the pressure lifting foot transmission mechanism; the needle pitch adjusting shaft can be driven to rotate the needle pitch transmission mechanism by transmission fit with the adjusting section; the thread cutting transmission mechanism is in transmission fit with the thread cutting section and can drive the thread cutting shaft to move axially; when the transverse motor rotates, the lifting and pressing shaft, the needle pitch adjusting shaft and the thread cutting shaft can be driven to rotate one by one. The utility model discloses a stepping motor is horizontal and the mode that the three-phase combines is held in the palm to one, not only realizes stepping motor's a tractor serves several purposes, has still reduced stepping motor's quantity and sewing machine's vertical size, and the complete machine of being convenient for overturns the maintenance, and then has promoted the serviceability of product.

Description

Lift presser foot, trimming and gauge needle link gear and sewing machine

Technical Field

The utility model relates to a sewing machine transmission technical field, concretely relates to lift presser foot, trimming and gauge needle link gear and sewing machine.

Background

The existing sewing machine adopts a mode of longitudinally arranging a stepping motor to realize the functions of lifting a presser foot and cutting a thread, and needs to be additionally provided with the stepping motor to realize the functions of adjusting the needle pitch and encrypting the seam, or is provided with a cylinder or an electromagnet to realize the encryption function.

For the first scheme, although digital stitch length adjustment can be realized, the size of a stepping motor used for adjusting the stitch length is large, the occupied space is large, more additional devices cannot be installed on the sewing machine, and the process expansibility is reduced. For the second scheme, because an air cylinder or an electromagnet is adopted to realize the encryption function, the stitch length of the seam needs to be manually adjusted during encryption, the problem that digital stitch length adjustment cannot be realized exists, and part of processes cannot meet the production requirements.

In addition, in the two schemes, the stepping motors for realizing the functions of lifting the presser foot and cutting the thread are longitudinally arranged, and the longitudinal arrangement of the stepping motors can cause the motors to exceed the shell surface too much, so that the sewing machine is inconvenient to overhaul.

Disclosure of Invention

In view of this, the utility model aims at providing a lift presser foot, trimming and gauge needle link gear to solve the technical problem that current sewing machine is bulky, be not convenient for overhaul.

The utility model discloses the technical scheme who adopts does: a lift presser foot, thread trimming and gauge linkage mechanism comprising:

the transverse motor is in transmission connection with a transversely arranged power output shaft;

the driving cam is connected to the power output shaft and comprises a single lifting pressing section, an adjusting section and a shearing section which are axially arranged;

the pressure raising and pressing foot transmission mechanism is connected between the driving cam and the pressure raising and pressing shaft in a transmission manner, and can be matched with the single pressure raising and pressing section to drive the pressure raising and pressing shaft to rotate;

the needle pitch transmission mechanism is connected between the driving cam and the needle pitch adjusting shaft in a transmission manner, and can drive the needle pitch adjusting shaft to rotate by being matched with the adjusting section;

the trimming transmission mechanism is connected between the driving cam and the trimming shaft in a transmission manner, and can drive the trimming shaft to axially move by being matched with the trimming section;

when the power output shaft rotates, the pressure lifting shaft, the needle pitch adjusting shaft and the thread cutting shaft can be driven to rotate one by one and move axially.

Preferably, the driving cam comprises a pressure raising foot cam part, a needle pitch cam part and a thread cutting cam part which are axially arranged;

the presser foot lifting cam part comprises a single presser foot lifting section, a trimming presser foot lifting section and a presser foot lifting and holding section which are sequentially arranged in the circumferential direction; the needle pitch cam part comprises a minimum needle pitch keeping section, an adjusting section and a maximum needle pitch keeping section which are arranged in sequence in the circumferential direction; the trimming cam part comprises a trimming segment, a trimming holding segment and a back-cutting segment which are sequentially arranged in the circumferential direction;

the central angle corresponding to the maximum needle pitch keeping section is larger than the central angle corresponding to the single lifting and pressing section and smaller than the central angle corresponding to the thread trimming keeping section; the central angle corresponding to the minimum needle pitch maintaining section is larger than the central angle corresponding to the shearing line section and smaller than the central angle corresponding to the pressure lifting and pressing foot maintaining section.

Preferably, the central angle range corresponding to the minimum needle pitch keeping section is 120-140 degrees, and the central angle range corresponding to the maximum needle pitch keeping section is 100-120 degrees; the central angle range corresponding to the single wire lifting and pressing section and the wire shearing lifting and pressing section is 90-110 degrees; the corresponding central angle range of the shearing section and the back-cutting section is 75-95 degrees.

Preferably, the pressure raising and holding section and the thread cutting holding section are correspondingly arranged in the axial direction of the power output shaft, so that the pressure raising shaft and the thread cutting shaft are respectively driven to rotate and axially move through the positive and negative rotation of the power output shaft.

Preferably, the pressure foot lifting transmission mechanism comprises a first roller, a first swing crank, a second swing crank, a pull rod and a pressure lifting wrench; one end of the pressure lifting wrench is fixedly connected with the pressure lifting shaft, the top end of the pull rod is rotatably connected with the pressure lifting wrench, the bottom end of the pull rod is rotatably connected with the swinging end of the second swinging crank, the rotating end of the second swinging crank is fixedly connected with the rotating end of the first swinging crank, and the first roller is rotatably connected to the swinging end of the first swinging crank and abuts against the rear side of the pressure lifting and pressing pin cam part so as to drive the pressure lifting shaft to rotate through the swinging of the first swinging crank in the longitudinal direction.

Preferably, the top end of the pull rod is rotatably connected with the pressure lifting wrench through an axial screw, and the pressure lifting wrench is provided with at least two fixing holes matched with the axial screw so as to realize the height adjustment of the pressure lifting foot.

Preferably, the needle pitch transmission mechanism comprises a second roller and a needle pitch adjusting crank, the rotating end of the needle pitch adjusting crank is fixedly connected with the needle pitch adjusting shaft, the second roller is rotatably connected to the swinging end of the needle pitch adjusting crank and abuts against the front side of the needle pitch cam part, so that the needle pitch adjusting shaft is driven to rotate through the swinging of the needle pitch adjusting crank in the longitudinal direction.

Preferably, the thread trimming transmission mechanism comprises a swinging ball, a swinging plate, a thread trimming connecting plate and a thread trimming fixing block, the thread trimming fixing block is fixedly connected to the thread trimming shaft, one end of the thread trimming connecting plate is rotatably connected with the thread trimming fixing block, the other end of the thread trimming connecting plate is rotatably connected with the swinging end of the swinging plate, and the swinging ball is rotatably arranged on the lifting end of the swinging plate and is located below the thread trimming cam part so as to drive the thread trimming shaft to axially move through the swinging plate in the transverse direction.

Preferably, still including being used for driving pine line axle pivoted pine line drive mechanism, pine line drive mechanism includes pine line balance board and pine line crank, the one end and the pine line fixed block fixed connection of pine line balance board, the other end is walked around horizontal motor and is rotated with the swing end of pine line crank and be connected, the rotation end and the pine line axle fixed connection of pine line crank, in order to pass through the horizontal migration of pine line fixed block in the transverse direction drives the rotation of pine line axle.

Another object of the present invention is to provide a sewing machine, comprising the above-mentioned presser foot lifting, thread cutting and stitch length linkage mechanism, a bracket, an upper housing and a lower housing, wherein the bracket is fixedly connected to the upper housing or the lower housing, and the transverse motor is arranged above the lower housing along the transverse direction and is fixedly connected to the bracket; the rotating end of the swinging plate of the trimming transmission mechanism is rotatably connected with the bracket through a pin shaft; the rotating end of a second swinging crank of the presser foot lifting transmission mechanism and the rotating end of a first swinging crank are rotatably connected with the support through a connecting shaft.

The utility model has the advantages that:

1. the utility model discloses a mode that step motor is horizontal and the three-phase combination is held in the palm to one, will step motor transversely set up at the casing rear side earlier, the rethread lifts presser foot drive mechanism, gauge needle drive mechanism, trimming drive mechanism will drive cam with lift the last item, the gauge needle regulating spindle, the trimming axle is the transmission respectively and is connected, realize step motor's a tractor serves several purposes, step motor's quantity and sewing machine's vertical size have been reduced, the complete machine of being convenient for overturns the maintenance, and then the serviceability of product has been promoted.

2. The utility model discloses can realize singly lifting presser foot, singly cut line and lift multiple technologies such as presser foot function after cutting line earlier, lift the presser foot height simultaneously and can two shelves adjust, improve the sewing machine suitability.

3. The utility model discloses a step motor control fixed needle distance trimming, lift presser foot and the action of adjusting the needle pitch for sewing machine compact structure, save space, for other additional devices give way the position, adaptable more technological requirements.

Drawings

FIG. 1 is a schematic structural view of a presser foot lifting, thread trimming and stitch length linkage mechanism of the present invention;

fig. 2 is a schematic structural diagram of a driving cam according to the present invention;

fig. 3 is a front view of the presser foot lifting cam part of the present invention;

fig. 4 is a front view of the pitch cam portion of the present invention;

fig. 5 is a front view of the trimming cam portion of the present invention;

fig. 6 is a schematic structural view of a presser foot lifting transmission mechanism in the present invention;

FIG. 7 is a schematic view of the lifting wrench of FIG. 6;

fig. 8 is a schematic structural view of a pitch drive mechanism according to the present invention;

fig. 9 is a schematic structural view of the trimming transmission mechanism of the present invention;

fig. 10 is a schematic structural view of the thread releasing transmission mechanism of the present invention;

fig. 11 is a schematic structural view of the sewing machine of the present invention.

The reference numbers in the figures illustrate:

100. a transverse motor;

200. a drive cam;

210. a presser foot lifting cam part; 211. a single pressure raising section; 212. shearing and lifting a line; 213. a presser foot lifting holding section;

220. a needle pitch cam portion; 221. a minimum gauge holding section; 222. an adjustment section; 223. a maximum gauge holding section; 224. a standby section;

230. a trimming cam portion; 231. cutting line segments; 232. a trimming holding section; 233. a tool retracting section;

300. a presser foot lifting transmission mechanism;

301. a first roller; 302. a first swing crank; 303. a second swing crank; 304. a pull rod; 305. lifting and pressing the wrench;

306. an axial screw; 307. a fixing hole; 308. a connecting shaft; 310. lifting and pressing the shaft;

400. a needle pitch drive mechanism;

401. a second roller; 402. a needle pitch adjusting crank; 410. a needle pitch adjusting shaft;

500. a trimming transmission mechanism;

501. swinging the ball; 502. a swing plate; 503. trimming a connecting plate; 504. a loose wire fixing block; 505. a pin shaft; 510. a thread cutting shaft;

600. a slack transmission mechanism;

601. loosening the line and swinging the plate; 602. a thread releasing crank; 610. loosening the bobbin;

700. a support;

800. an upper housing;

900. a lower case.

Detailed Description

The following describes the present invention in further detail with reference to the accompanying drawings. These embodiments are only for illustrating the present invention and are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Embodiments, as shown in fig. 1-10, a presser foot, cut and gauge linkage mechanism, comprising:

a horizontal motor 100, wherein the horizontal motor 100 is connected with a power output shaft transversely arranged in the horizontal direction in a transmission way.

The driving cam 200 is fixedly connected to the power output shaft, and comprises a single lifting and pressing section 211, an adjusting section 222 and a trimming section 231 which are axially arranged.

And the lifting and pressing foot transmission mechanism 300 is in transmission connection between the driving cam 200 and the lifting and pressing shaft 310, and the lifting and pressing foot transmission mechanism 300 is matched with the single lifting and pressing section 211 to drive the lifting and pressing shaft 310 to rotate.

And a needle pitch transmission mechanism 400, wherein the needle pitch transmission mechanism 400 is connected between the driving cam 200 and the needle pitch adjusting shaft 410 in a transmission manner, and is matched with the adjusting section 222 to drive the needle pitch adjusting shaft 410 to rotate.

And the trimming transmission mechanism 500 is in transmission connection between the driving cam 200 and the trimming shaft 510, and is matched with the trimming segment 231 to drive the trimming shaft 510 to axially move.

When the power output shaft of the transverse motor 100 rotates, the pressure-raising shaft 310, the needle pitch adjusting shaft 410 and the thread cutting shaft 510 can be driven to rotate one by one.

The method adopts a mode of combining a stepping motor with a horizontal motor and a single support; firstly, the stepping motor is transversely arranged, the driving cam 200 is fixedly connected to a power output shaft of the transverse motor 100, and then the single lifting and pressing section 211, the adjusting section 222 and the trimming section 231 of the driving cam 200 are respectively in transmission connection with the lifting and pressing shaft 310, the stitch length adjusting shaft 410 and the trimming shaft 510 through the lifting and pressing foot transmission mechanism 300, the stitch length transmission mechanism 400 and the trimming transmission mechanism 500, so that the lifting and pressing shaft 310, the stitch length adjusting shaft 410 and the trimming shaft 510 are driven to rotate one by one through the rotation of the power output shaft of the transverse motor 100, the axial movement of the trimming shaft 510 is realized, three dragging of the stepping motor is realized, the use number of the stepping motor and the longitudinal size of the sewing machine are reduced, the turnover maintenance of the whole machine is facilitated, and the serviceability of products is improved.

In one embodiment, as shown in fig. 2, 3, 4, 5, the drive cam 200 includes an axially disposed presser foot cam portion 210, a gauge cam portion 220, and a thread trimming cam portion 230; the presser foot lifting cam portion 210, the stitch cam portion 220 and the thread cutting cam portion 230 may be integrally formed, or may be separately formed and then axially and sequentially fixedly connected to the power output shaft of the transverse motor 100. So set up because: the presser foot lifting cam part 210, the stitch cam part 220 and the thread trimming cam part 230 are axially arranged on the driving cam 200, and the presser foot lifting transmission mechanism 300, the stitch transmission mechanism 400 and the thread trimming transmission mechanism 500 are respectively in transmission connection with the presser foot lifting cam part 210, the stitch cam part 220 and the thread trimming cam part 230 by utilizing spatial dislocation and do not interfere with each other.

The presser foot lifting cam part 210 comprises a single presser foot lifting section 211, a trimming presser foot lifting section 212 and a presser foot lifting and holding section 213 which are sequentially arranged along the circumferential direction; in the clockwise direction, the single pressure lifting section 211 is an arc with gradually increasing radial size, the trimming pressure lifting section 212 is an arc with gradually decreasing radial size, and the pressure lifting and holding section 213 is an arc with equal radius. The needle pitch cam portion 220 includes a minimum needle pitch holding section 221, an adjusting section 222, a maximum needle pitch holding section 223, and a standby section 224, which are sequentially arranged in a circumferential direction; in the clockwise direction, the minimum gauge needle holding section 221 and the maximum gauge needle holding section 223 are both in an arc shape with equal radius, the radial dimension of the minimum gauge needle holding section 221 is smaller than that of the maximum gauge needle holding section 223, the adjusting section 222 is in an arc shape with gradually increasing radial dimension, and the standby section 224 is in an arc shape with gradually decreasing radial dimension. The trimming cam portion 230 includes a trimming section 231, a trimming holding section 232, and a back-cutting section 233 which are sequentially arranged in the circumferential direction; in the clockwise direction, the trimming section 231 is an arc shape with a gradually decreasing radial dimension, the trimming holding section 232 is an arc shape with an equal radius, and the back cutting section 233 is an arc shape with an increasing radial dimension. The central angle corresponding to the maximum needle pitch keeping section 223 is larger than the central angle corresponding to the single lifting and pressing section 211 and smaller than the central angle corresponding to the thread trimming keeping section 232; the central angle corresponding to the minimum needle pitch holding section 221 is larger than the central angle corresponding to the shearing line section 231 and smaller than the central angle corresponding to the presser foot lifting holding section 213.

This is so set up because: when the power output shaft of the transverse motor 100 rotates, the presser foot lifting transmission mechanism 300, the stitch length transmission mechanism 400, and the thread trimming transmission mechanism 500 are always in transmission connection with the presser foot lifting cam portion 210, the stitch length cam portion 220, and the thread trimming cam portion 230. The central angle corresponding to the maximum needle pitch keeping section 223 is set to be larger than the central angle corresponding to the single pressure lifting section 211 and smaller than the central angle corresponding to the thread trimming keeping section 232, so that when the power output shaft of the transverse motor 100 rotates anticlockwise, the pressure lifting and pressing foot transmission mechanism 300 is in matched transmission with the single pressure lifting section 211 of the pressure lifting and pressing foot cam part 210 and drives the pressure lifting and pressing shaft 310 to rotate, and meanwhile, the needle pitch transmission mechanism 400 is in matched transmission with the maximum needle pitch keeping section 223 of the needle pitch cam part 220, so that the needle pitch adjusting shaft 410 is fixed and the maximum needle pitch is kept; the trimming transmission mechanism 500 is in transmission with the trimming holding section 232 of the trimming cam portion 230 in a matching manner, so that the trimming shaft 510 is fixed, and the action of lifting the presser foot by one is further realized. The central angle corresponding to the minimum needle pitch keeping section 221 is set to be larger than the central angle corresponding to the trimming section 231 and smaller than the central angle corresponding to the presser foot lifting and holding section 213, so that when the power output shaft of the transverse motor 100 rotates clockwise, the trimming transmission mechanism 500 is in matched transmission with the trimming section 231 of the trimming cam part 230 and drives the trimming shaft 510 to move axially; meanwhile, the needle pitch transmission mechanism 400 is in transmission with the minimum needle pitch maintaining section 221 of the needle pitch cam part 220 in a matching manner, so that the needle pitch adjusting shaft 410 is fixed and the minimum needle pitch is maintained; the presser foot lifting transmission mechanism 300 is in matched transmission with the presser foot lifting holding section 213 of the presser foot lifting cam part 210, so that the presser foot lifting shaft 310 is fixed, and single thread trimming action is realized.

Preferably, the central angle range corresponding to the minimum needle pitch keeping section 221 is 120-140 degrees, the central angle range corresponding to the maximum needle pitch keeping section 223 is 100-120 degrees, and the central angle range corresponding to the adjusting section 222 is 50-75 degrees; the central angle range corresponding to the single pressure lifting section 211 and the trimming pressure lifting section 212 is 90-110 degrees, and the central angle range corresponding to the pressure lifting and holding section 213 is 140-180 degrees; the central angle range corresponding to the shearing line section 231 and the back cutting section 233 is 75-95 degrees, and the central angle range corresponding to the shearing line keeping section 232 is 170-210 degrees.

In a specific embodiment, as shown in fig. 2, the presser foot holding section 213 of the presser foot cam portion 210 and the trimming holding section 232 of the trimming cam portion 230 are correspondingly arranged in the power output shaft axial direction, so as to respectively drive the presser shaft 310 to rotate and the trimming shaft 510 to axially move through the forward and reverse rotation of the power output shaft. So set up because: after the presser foot lifting and holding section 213 and the trimming holding section 232 are correspondingly arranged in the axial direction, the presser foot lifting and driving mechanism 300 is arranged at the rear side of the longitudinal direction of the driving cam 200 in a matching manner and is in butt joint transmission with the presser foot lifting cam portion 210, and the trimming driving mechanism 500 is arranged right below the driving cam 200 and is in butt joint transmission with the trimming cam portion 230, so that the presser foot lifting and holding shaft 310 can be respectively driven to rotate and the trimming shaft 510 can axially move through the forward and reverse rotation of the power output shaft of the transverse motor 100, and the presser foot lifting action after trimming can be realized through the continuous clockwise rotation of the power output shaft of the transverse motor 100.

In one embodiment, as shown in fig. 6, the lift and press foot transmission mechanism 300 includes a first roller 301, a first swing crank 302, a second swing crank 303, a pull rod 304, and a lift and press wrench 305; one end of the pressure lifting wrench 305 is fixedly connected with the pressure lifting shaft 310, the top end of the pull rod 304 is rotatably connected with the pressure lifting wrench 305 through an axial screw 306, the bottom end of the pull rod is rotatably connected with the swing end of the second swing crank 303 through an axial screw 306, the rotation end of the second swing crank 303 and the rotation end of the first swing crank 302 are fixedly connected through a connecting shaft 308, and the first roller 301 is rotatably connected to the swing end of the first swing crank 302 and is abutted against the pressure lifting and holding piece holding section 213 at the rear side of the pressure lifting and holding piece cam portion 210.

This is so set up because: when the power output shaft of the transverse motor 100 rotates counterclockwise, the presser foot lifting cam portion 210 can be driven to rotate counterclockwise, and the presser foot lifting holding section 213 is in transmission fit with the first roller 301 to drive the swing end of the first swing crank 302 to swing back and forth in the vertical plane in the longitudinal direction, the swing of the first swing crank 302 drives the swing end of the second swing crank 303 to swing in the vertical plane in the longitudinal direction, the swing of the second swing crank 303 drives the pull rod 304 to lift in the vertical direction, and the lifting of the pull rod 304 drives the pressure lifting wrench 305 to swing in the vertical plane, and finally the pressure lifting shaft 310 is driven to rotate.

It is preferred. As shown in fig. 7, at least two fixing holes 307 for matching with the axis screw 306 are provided on the lifting and pressing wrench 305 at the connection position with the pull rod 304 to realize the height adjustment of the lifting and pressing foot. So set up because: after the pull rod 304 is connected with the fixing holes 307 at different positions on the pressure lifting wrench 305 by using the shaft position screw 306, the swing amplitude of the pressure lifting wrench 305 in the vertical plane can be changed, and further the rotation angle of the pressure lifting shaft 310 is changed, so that the height of the pressure lifting pin is adjusted.

In a specific embodiment, as shown in fig. 8, the needle pitch drive mechanism 400 includes a second roller 401 and a needle pitch adjusting crank 402, wherein a rotating end of the needle pitch adjusting crank 402 is fixedly connected to a needle pitch adjusting shaft 410, and the second roller 401 is rotatably connected to a swinging end of the needle pitch adjusting crank 402 and abuts against the adjusting section 222 at a front side of the needle pitch cam portion 220. So set up because: when the power output shaft of the transverse motor 100 rotates, the needle pitch cam portion 220 rotates along with the power output shaft, the needle pitch adjusting crank 402 can swing back and forth in a vertical plane in the longitudinal direction through the abutting transmission of the adjusting section 222 and the second roller 401, the needle pitch adjusting crank 402 can swing to drive the needle pitch adjusting shaft 410 to rotate, and therefore the adjustment of the needle pitch is achieved.

In a specific embodiment, as shown in fig. 9, the thread trimming transmission mechanism 500 includes a swinging ball 501, a swinging plate 502, a thread trimming connecting plate 503 and a thread trimming fixing block 504, the thread trimming fixing block 504 is fixedly connected to an axially movable thread trimming shaft 510, one end of the thread trimming connecting plate 503 is rotatably connected to the bottom end of the thread trimming fixing block 504 through a shaft screw 306, the other end of the thread trimming connecting plate 503 is rotatably connected to the swinging end of the swinging plate 502 through the shaft screw 306, the swinging ball 501 is rotatably connected to the lifting end of the swinging plate 502 through the shaft screw 306, and the swinging ball 501 is located right below the thread trimming cam portion 230 and abuts against the thread trimming retaining section 232 of the thread trimming cam portion 230.

So set up because: when the power output shaft of the transverse motor 100 rotates clockwise, the trimming cam portion 230 can be driven to rotate clockwise, the trimming segment 231 is in transmission fit with the swinging ball 501, the lifting end of the swinging plate 502 is driven to lift in the vertical direction, the swinging end of the swinging plate 502 is driven to swing back and forth in the vertical plane in the transverse direction, and the trimming connecting plate 503 is driven to drive the thread loosening fixing block 504 to move back and forth in the transverse direction, so that the trimming shaft 510 is driven to move axially.

Preferably, as shown in fig. 10, the linkage mechanism further includes a thread releasing transmission mechanism 600 for driving the thread releasing shaft 610 to rotate, the thread releasing transmission mechanism 600 includes a thread releasing swinging plate 601 and a thread releasing crank 602, the thread releasing swinging plate 601 is generally L-shaped, the bottom end thereof is fixedly connected with the thread releasing fixing block 504 through a screw, the top end thereof passes under the transverse motor 100 and is slidably connected with the swinging end of the thread releasing crank 602, and the rotating end of the thread releasing crank 602 is fixedly connected with the thread releasing shaft 610. This is so set up because: the thread loosening fixing block 504 can horizontally move in the transverse direction to drive the thread loosening swinging plate 601 to horizontally move in the transverse direction, so that the bottom end of the thread loosening crank 602 is driven to swing back and forth in the vertical plane in the transverse direction, and the thread loosening shaft 610 is driven to rotate through the swinging of the thread loosening crank 602.

In an embodiment, as shown in fig. 11, a sewing machine includes the above-mentioned linkage mechanism for lifting and pressing the foot, cutting the thread and the stitch length, and further includes a bracket 700, an upper machine shell 800 and a lower machine shell 900, wherein the upper machine shell 800 is fixedly connected above the lower machine shell 900, and the bracket 700 is fixedly connected to the upper machine shell 800 or the lower machine shell 900; the power output shaft of the transverse motor 100 is arranged above the lower casing 900 along the transverse direction and is fixedly connected with the bracket 700; the rotating end of the swinging plate 502 of the trimming transmission mechanism 500 is rotatably connected with the bracket 700 through a pin shaft 505, so that the rotating end of the swinging plate 502 can rotate in a vertical plane in the transverse direction; the rotation end of the second swing crank 303 and the rotation end of the first swing crank 302 of the presser foot lifting transmission mechanism 300 are rotatably connected to the bracket 700 through a connecting shaft 308, so that the second swing crank 303 and the first swing crank 302 can swing in a vertical plane in the longitudinal direction.

The utility model discloses a theory of operation as follows:

as shown in fig. 1, in the initial position, the adjusting section 222 of the needle pitch cam portion 220 is in abutting engagement with the second roller 401, and the needle pitch adjusting shaft 410 has been adjusted to a predetermined position, for example, the corresponding needle pitch is 3 mm; the presser foot holding section 213 of the presser foot cam portion 210 is brought into abutment with the first roller 301, and the thread cutting holding section 232 of the thread cutting cam portion 230 is brought into abutment with the swing ball 501.

The needle pitch adjustment process is as follows:

as shown in fig. 1 and 9, when the transversal motor 100 rotates counterclockwise, the needle pitch cam portion 220 is driven to rotate counterclockwise, due to the gradual increase of the radial dimension of the adjusting section 222, the needle pitch cam portion 220 pushes the second roller 401 to move toward the side far away from the transversal motor 100 (the front side of the sewing machine), and further the needle pitch adjusting crank 402 drives the needle pitch adjusting shaft 410 to rotate, and when the transversal motor 100 stops rotating and keeps, the needle pitch also becomes larger and keeps, so as to realize the needle pitch increasing function.

As shown in fig. 1 and 9, when the horizontal motor 100 rotates clockwise, the needle pitch cam portion 220 is driven to rotate clockwise, and due to the gradual decrease of the radial dimension of the adjusting section 222, the needle pitch cam portion 220 pushes the second roller 401 to move toward the side close to the horizontal motor 100 (the rear side of the sewing machine), and further drives the needle pitch adjusting shaft 410 to rotate through the needle pitch adjusting crank 402, and when the horizontal motor 100 stops rotating and keeps, the needle pitch also becomes smaller and keeps, so that the needle pitch reducing function is realized.

During the stitch length adjustment, the first roller 301 is always in abutting engagement with the presser foot lifting holding section 213 of the presser foot lifting cam portion, and the swing ball 501 is always in abutting engagement with the thread cutting holding section 232 of the thread cutting cam portion 230, ensuring that the stitch length adjustment is performed independently.

The process of lifting the presser foot is as follows:

starting to rotate anticlockwise from the initial position of the transverse motor 100, when the needle pitch cam part 220 rotates anticlockwise until the maximum needle pitch keeping section 223 abuts against and is matched with the second roller 401, the needle pitch adjusting shaft 410 is fixed because the radial dimension of the maximum needle pitch keeping section 223 is unchanged, and the needle pitch is maximum and kept; meanwhile, the single pressure lifting section 211 of the pressure lifting and pressing foot cam part is abutted and matched with the first roller 301, and due to the fact that the radial size of the single pressure lifting section 211 is increased, the first roller 301 can move towards the direction (the rear side of the sewing machine) far away from the power output shaft of the transverse motor 100, so that the first swing crank 302 and the second swing crank 303 are driven to rotate in the vertical plane in the longitudinal direction, the pressure lifting wrench 305 is driven to rotate downwards through the descending of the pull rod 304, the pressure lifting and pressing shaft 310 is driven to rotate, and finally the pressure lifting and pressing foot function is achieved.

When the single pressing section 211 of the pressing foot cam portion 210 is pressed against the first roller 301, the pressing foot is positioned at the highest position. During the presser foot lifting, the second roller 401 is always in butt fit with the maximum needle pitch keeping section 223 of the needle pitch cam portion, and the swinging ball 501 is always in butt fit with the trimming keeping section 232 of the trimming cam portion 230, so that the independent operation of the presser foot lifting action is ensured, and the needle pitch and trimming are not influenced. Then the horizontal motor 100 rotates clockwise, the presser foot falls back, the horizontal motor 100 returns to the initial position, and the needle pitch is reset.

Two fixing holes 307 are arranged on the pressure lifting wrench 305, and when the pull rod 304 is connected with the other fixing hole 307, the lifting height of the pressure foot can be further lifted, so that two-step adjustment of the height of the pressure foot is realized.

The thread cutting process is as follows:

when the swing ball 501 abuts against and cooperates with the minimum needle pitch retaining section 221 of the needle pitch cam portion 220, the radial dimension of the minimum needle pitch retaining section 221 is unchanged, so that the needle pitch is changed to and maintained at the minimum needle pitch, then the cutting line segment 231 of the cutting line cam portion 230 abuts against and cooperates with the swing ball 501, and as the radial dimension of the cutting line segment 231 is gradually increased, the swing ball 501 is pushed to move downwards, so that the lifting end of the swing plate 502 is driven to rotate in the vertical plane in the longitudinal direction, and meanwhile, the swing end of the swing plate 502 rotates in the vertical plane in the transverse direction, and the loose line fixing block 504 is driven to move in the transverse direction (the axial direction of the cutting line shaft 510) through the transmission action of the cutting line connecting plate 503, so as to finally drive the cutting line shaft 510 to move axially, thereby realizing the single cutting action.

After the thread cutting and thread discharging operation is completed (the swinging ball 501 abuts against the tail end of the thread cutting section 231), if the transverse motor 100 continues to rotate clockwise, at this time, the swinging ball 501 will continue to abut against and cooperate with the thread returning section 233 of the thread cutting cam portion 230, and as the size of the thread returning section 233 is gradually reduced, the thread cutting shaft 510 will move axially in the opposite direction, so as to realize thread returning and thread cutting. If the transverse motor 100 is changed to rotate counterclockwise, the thread trimmer knife returns to cut the thread and restores to the initial position due to the reverse axial movement of the thread trimming shaft 510, thereby realizing the function of single thread trimming.

The thread loosening process is as follows:

when the thread cutting shaft 510 moves axially and performs thread cutting, the thread cutting shaft 510 drives the thread loosening crank 602 to rotate on a vertical surface in the transverse direction through the thread loosening fixing block 504 and the thread loosening swinging plate 601, and further drives the thread loosening shaft 610 to rotate, so that the thread loosening function is realized.

Compared with the prior art, the application has at least the following beneficial technical effects:

the single-needle-pitch thread trimming device not only can realize the single presser foot lifting action, the single thread trimming action, the action of firstly trimming and then lifting the presser foot, but also can realize the thread trimming action with fixed needle pitch; simultaneously, lift presser foot height in this application and have two shelves regulatory ability, can improve sewing machine suitability.

This application adopts a step motor control thread trimming, lifts presser foot and the function of adjusting the stitch length for sewing machine compact structure, save space, for the installation of other additional devices lets out the position, adaptable more technological requirements.

This application adopts step motor transverse arrangement's mode, and the complete machine of being convenient for overturns the maintenance, has improved the serviceability that promotes the product.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims (10)

1. The utility model provides a lift presser foot, trimming and gauge needle link gear which characterized in that includes:

the horizontal motor (100), the horizontal motor (100) is connected with a power output shaft which is arranged horizontally in a transmission way;

the driving cam (200) is connected to the power output shaft, and comprises a single lifting and pressing section (211), an adjusting section (222) and a thread cutting section (231) which are axially arranged;

the pressure foot lifting transmission mechanism (300) is connected between the driving cam (200) and the pressure lifting shaft (310) in a transmission manner, and can drive the pressure lifting shaft (310) to rotate by being matched with the single pressure lifting section (211);

the needle pitch transmission mechanism (400) is in transmission connection between the driving cam (200) and the needle pitch adjusting shaft (410), and is matched with the adjusting section (222) to drive the needle pitch adjusting shaft (410) to rotate;

the trimming transmission mechanism (500) is in transmission connection between the driving cam (200) and the trimming shaft (510), and can drive the trimming shaft (510) to axially move in cooperation with the trimming section (231);

when the power output shaft rotates, the pressure lifting shaft (310), the needle pitch adjusting shaft (410) and the thread cutting shaft (510) can be driven to rotate one by one.

2. The presser foot lifting, thread trimming and gauge linkage mechanism according to claim 1, wherein said drive cam (200) comprises an axially disposed presser foot lifting cam portion (210), a gauge cam portion (220) and a thread trimming cam portion (230);

the presser foot lifting cam part (210) comprises a single presser foot lifting section (211), a trimming presser section (212) and a presser foot lifting and holding section (213) which are sequentially arranged in the circumferential direction; the needle pitch cam part (220) comprises a minimum needle pitch keeping section (221), an adjusting section (222) and a maximum needle pitch keeping section (223) which are arranged in a circumferential sequence; the trimming cam part (230) comprises a trimming segment (231), a trimming holding segment (232) and a knife return segment (233) which are sequentially arranged in the circumferential direction;

the central angle corresponding to the maximum needle pitch keeping section (223) is larger than the central angle corresponding to the single lifting and pressing section (211) and smaller than the central angle corresponding to the thread trimming keeping section (232); the central angle corresponding to the minimum needle pitch keeping section (221) is larger than the central angle corresponding to the shearing line section (231) and smaller than the central angle corresponding to the presser foot lifting and keeping section (213).

3. The presser foot lifting, thread trimming and gauge linkage mechanism according to claim 2, wherein the central angle range corresponding to the minimum gauge holding section (221) is 120-140 °, and the central angle range corresponding to the maximum gauge holding section (223) is 100-120 °; the central angle range corresponding to the single pressure lifting section (211) and the trimming pressure lifting section (212) is 90-110 degrees; the central angle range corresponding to the shearing section (231) and the back cutting section (233) is 75-95 degrees.

4. The linkage mechanism of claim 3, wherein the presser foot lifting and holding section (213) and the thread cutting and holding section (232) are correspondingly arranged in the axial direction of the power output shaft, so that the rotation of the presser foot lifting shaft (310) and the axial movement of the thread cutting shaft (510) are respectively driven by the positive and negative rotation of the power output shaft.

5. The lifting and pressing foot, trimming and stitch length linkage mechanism according to claim 4, characterized in that the lifting and pressing foot transmission mechanism (300) comprises a first roller (301), a first swing crank (302), a second swing crank (303), a pull rod (304) and a lifting and pressing wrench (305); one end of the pressure lifting wrench (305) is fixedly connected with a pressure lifting shaft (310), the top end of the pull rod (304) is rotatably connected with the pressure lifting wrench (305), the bottom end of the pull rod is rotatably connected with the swinging end of the second swinging crank (303), the rotating end of the second swinging crank (303) is fixedly connected with the rotating end of the first swinging crank (302), and the first roller (301) is rotatably connected to the swinging end of the first swinging crank (302) and abuts against the rear side of the pressure lifting and pressing pin cam part (210) so as to drive the pressure lifting shaft (310) to rotate through the swinging of the first swinging crank (302) in the longitudinal direction.

6. The linkage mechanism of lifting and pressing foot, trimming and needle distance is characterized in that the top end of the pull rod (304) is rotatably connected with a lifting and pressing spanner (305) through a shaft position screw (306), and the lifting and pressing spanner (305) is provided with at least two fixing holes (307) used for being matched with the shaft position screw (306) so as to realize the adjustment of the height of the lifting and pressing foot.

7. The presser foot lifting, thread trimming and needle pitch linkage mechanism according to claim 4, wherein the needle pitch transmission mechanism (400) comprises a second roller (401) and a needle pitch adjusting crank (402), a rotating end of the needle pitch adjusting crank (402) is fixedly connected with the needle pitch adjusting shaft (410), and the second roller (401) is rotatably connected to a swinging end of the needle pitch adjusting crank (402) and abuts against a front side of the needle pitch cam portion (220) to drive the needle pitch adjusting shaft (410) to rotate through the swinging of the needle pitch adjusting crank (402) in a longitudinal direction.

8. The presser foot lifting, thread trimming and stitch length linkage mechanism according to claim 4, wherein the thread trimming transmission mechanism (500) comprises a swinging ball (501), a swinging plate (502), a thread trimming connecting plate (503) and a thread loosening fixing block (504), the thread loosening fixing block (504) is fixedly connected to the thread trimming shaft (510), one end of the thread trimming connecting plate (503) is rotatably connected with the thread loosening fixing block (504), the other end of the thread trimming connecting plate is rotatably connected with the swinging end of the swinging plate (502), and the swinging ball (501) is rotatably arranged on the lifting end of the swinging plate (502) and is positioned below the thread trimming cam portion (230) so as to drive the thread trimming shaft (510) to axially move through swinging of the swinging plate (502) in the transverse direction.

9. The presser foot lifting, thread trimming and stitch length linkage mechanism according to claim 8, further comprising a thread releasing transmission mechanism (600) for driving the thread releasing shaft (610) to rotate, wherein the thread releasing transmission mechanism (600) comprises a thread releasing swinging plate (601) and a thread releasing crank (602), one end of the thread releasing swinging plate (601) is fixedly connected with the thread releasing fixing block (504), the other end of the thread releasing swinging plate bypasses the transverse motor (100) and is rotatably connected with the swinging end of the thread releasing crank (602), and the rotating end of the thread releasing crank (602) is fixedly connected with the thread releasing shaft (610) so as to drive the thread releasing shaft (610) to rotate through the horizontal movement of the thread releasing fixing block (504) in the transverse direction.

10. A sewing machine comprising the presser foot lifting, thread cutting and stitch length linkage mechanism as claimed in any one of claims 1 to 9, further comprising a bracket (700), an upper housing (800) and a lower housing (900), wherein the bracket (700) is fixedly connected to the upper housing (800) or the lower housing (900), and the transverse motor (100) is arranged above the lower housing (900) along the transverse direction and is fixedly connected with the bracket (700); the rotating end of a swinging plate (502) of the trimming transmission mechanism (500) is rotatably connected with the bracket (700) through a pin shaft (505); the rotating end of a second swinging crank (303) and the rotating end of a first swinging crank (302) of the presser foot lifting transmission mechanism (300) are rotatably connected with the bracket (700) through a connecting shaft (308).

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