CN115369576A - Sewing machine without swing seat - Google Patents

Abstract

The application provides a no swing seat sewing machine, concretely relates to sewing machine makes technical field, has driving source, work feed axle and feed dog, its characterized in that, sewing machine still has work feed and gauge needle adjustment mechanism, the outer rotor plate of work feed and gauge needle adjustment mechanism is installed to the preceding output shaft of driving source, and the driving source drives outer rotor plate in order to make a round trip to rotate the drive mode, and outer rotor plate is connected with the work feed axle, and the work feed axle is connected with the feed dog is indirect. The utility model provides a sewing machine does not have swing seat but has possessed all functions of swing seat, and moreover, gauge needle adjustment mechanism has and uses the regulation that just can realize a plurality of gauge needles of a driving source, need not change parts such as gauge needle groove, has effectively improved sewing machine's intelligent control level, has higher use spreading value.

Description

Sewing machine without swing seat

Technical Field

The application provides a no swing seat sewing machine, concretely relates to sewing machine makes technical field.

Background

The swing seat is an indispensable important part for realizing sewing work in the structure of the traditional sewing machine, is arranged between a connecting rod and a cloth feeding shaft crank, and is used for ensuring that the backstitch needle pitch corresponds to the forward stitch needle pitch, and the needle pitch adjusting function and the automatic backstitch function are realized by adjusting the angle of the swing seat. The needle pitch of the swing seat is adjusted into one of important functions, and the needle pitch adjusting part drives the feeding stud to adjust the angle of the swing seat in the front and back direction by rotating the needle pitch dial plate, so that the change of the needle pitch is realized; the automatic backstitch part drives the automatic backstitch rod group to drive the swing seat to swing to a certain angle through the automatic backstitch electromagnet to realize backstitch, and the spacing of backstitch needle distance is realized by the collision between the working arc surface of the regulator and the head of the feeding stud, so that the contact part of the stud and the feeding regulator is severely abraded due to long-time use, the needle distance is abnormal, the sewing effect is influenced, and meanwhile, the noise of the swing seat during working is also large.

In addition, the swing seat with the needle pitch adjusting function is almost unique to one sewing machine in the size of the needle pitch, and the sewing machine adopting a stepping motor to control the driving is difficult to implement the technical effect of one machine with multiple needles in the recently rising sewing machines.

Disclosure of Invention

In order to solve the problems existing in the prior sewing machine needle distance adjustment, the application particularly provides a sewing machine without a swing seat, which is provided with a driving source, a cloth feeding shaft, a cloth feeding tooth, a thread cutting mechanism and a presser foot lifting mechanism.

Preferably, the cloth feeding and stitch length adjusting mechanism is provided with a static positioning wheel which is fixed on the machine body in a fixed mode, a front output shaft of the driving source penetrates through a through hole formed in the static positioning wheel, the through hole formed in the static positioning wheel and the front output shaft are arranged in a concentric circle mode, and the through hole is located inside the stitch length adjusting and positioning groove.

Preferably, the cloth feeding and stitch length adjusting mechanism further comprises a follower plate, an outer rotating plate, an inner sliding plate, a sliding member and a connecting shaft, wherein the sliding member is connected with the inner sliding plate and penetrates through the outer rotating plate, the sliding member faces the driving source and extends into a stitch length adjusting and positioning groove of the static positioning wheel, the driving source drives the outer rotating plate in a back-and-forth rotating mode to enable the sliding member to perform passive operation in the stitch length adjusting and positioning groove along with the shape of the inner portion, an inner sliding plate is arranged in the outer rotating plate in a gap matching mode, the upper portion of the inner sliding plate is connected with the sliding member, the lower portion of the inner sliding plate is connected with the connecting shaft, the connecting shaft is in movable connection with the follower plate, the follower plate is fixedly connected with the cloth feeding shaft, the connecting shaft is in a limiting portion connected with the follower plate in a movable connection mode, and the outer rotating plate is provided with a shaft hole for fixedly connecting the cloth feeding driving source.

Preferably, the stitch length adjusting and positioning groove is provided with a stitch length adjusting groove, a positioning groove, a first transition groove and a second transition groove, the first transition groove and the second transition groove are positioned between the stitch length adjusting groove and the positioning groove, the stitch length adjusting and positioning groove is a closed groove, the stitch length adjusting groove has a stitch length adjusting function, the positioning groove has a positioning zero position function, the positioning zero position is a zero stitch length state of the feed dog below the needle plate, and the driving source is fixedly connected with the static positioning wheel.

Preferably, the needle pitch adjusting groove is provided with a reasonable length so as to realize multiple adjustment of the needle pitch, the amplitude of the back-and-forth swing of the sliding piece is the operation angle of the driving source for rotating, the operation angle of the driving source determines the size of the needle pitch, the shape of the needle pitch adjusting groove is preferably circular arc, and the needle pitch adjusting groove is additionally provided with a flat angle or a wave shape.

Preferably, the positioning groove and the front output shaft are arranged in a concentric circle, the front output shaft is concentric with the connecting shaft, and the driving source executes the thread cutting action of the thread cutting mechanism and the presser foot lifting action of the presser foot lifting mechanism within the time of positioning the groove.

Preferably, the driving source is fixed to a body of the sewing machine, and the driving source preferably uses a stepping motor or a servo motor.

Preferably, the thread trimming mechanism is provided with a thread trimming fork wheel, a thread trimming eccentric wheel and a thread trimming end execution end, the thread trimming eccentric wheel is mounted on a rear output shaft of the driving source, the thread trimming fork wheel is fixedly connected to a thread trimming rotating shaft, the other end of the thread trimming rotating shaft is connected with the thread trimming end execution end, a pushing piece is arranged at an eccentric position of the thread trimming eccentric wheel, the thread trimming fork wheel is provided with a return rod and a thread trimming rod, the pushing piece is located between the return rod and the thread trimming rod, the driving source drives the pushing piece of the rear output shaft to rotate to press the thread trimming rod downwards to transmit force to the thread trimming end execution end to trim threads, the thread trimming action is completed by the thread trimming end execution end, after the thread trimming is completed, the driving source continues to drive the pushing piece to rotate to the return rod, and the return rod returns to the original position in a proper manner, so that the whole thread trimming mechanism is reset.

Preferably, the presser foot lifting mechanism is provided with a presser foot lifting cam, a presser foot lifting ejector rod and a presser foot lifting tail end execution end, a rear output shaft provided with the presser foot lifting cam penetrates through the machine body, an arc surface of the presser foot lifting cam is a hollow surface, a cam surface of the presser foot lifting cam is a jacking surface of the presser foot lifting action, the rear output shaft is driven by the driving source to rotate the presser foot lifting cam to realize jacking and lifting of the presser foot ejector rod by using the jacking surface, the presser foot lifting ejector rod promotes the presser foot lifting tail end execution end to execute the presser foot lifting action, and the presser foot lifting cam is arranged at one end of the outermost side of the rear output shaft.

Preferably, a thread cutting fork wheel of the thread cutting mechanism is mounted on the front output shaft; the rear output shaft is provided with a pressure foot lifting cam of a pressure foot lifting mechanism, the rear output shaft penetrates through the machine body and a static positioning wheel arranged on the machine body, and the tail end of the rear output shaft is provided with an outer rotating plate.

Compared with the prior art, the brand-new sewing machine has the advantages that the outer rotating plate of the cloth feeding mechanism and the needle pitch adjusting mechanism is installed on the front output shaft of the driving source, the driving source drives the outer rotating plate in a back-and-forth rotation driving mode, the outer rotating plate is connected with the cloth feeding shaft, the cloth feeding shaft is indirectly connected with the cloth feeding teeth, the rear output shaft of the driving source is provided with the thread cutting mechanism and the presser foot lifting mechanism, the sewing machine does not have a swinging seat but has all functions of the swinging seat, in addition, the needle pitch adjusting mechanism has the function of adjusting a plurality of needle pitches by using one driving source, parts such as a needle pitch groove do not need to be replaced, the intelligent control level of the sewing machine is effectively improved, and the use and popularization values are higher.

Drawings

FIG. 1 is a schematic view of a cloth feed and gauge adjustment mechanism, a thread trimming mechanism and a presser foot lifting mechanism of a sewing machine without a swing seat according to the present application;

FIG. 2 is a view of the cloth feeding and stitch length adjusting mechanism and thread trimming mechanism of a sewing machine without a swing seat according to the present application;

FIG. 3 is a schematic view of a feed and gauge adjustment mechanism of a swing seat-less sewing machine according to the present application;

FIG. 4 is a schematic view of an outer rotating plate and a follower plate of a sewing machine without a swing seat according to the present application;

FIG. 5 is a view of the stationary positioning wheel of a sewing machine without a swing seat according to the present application;

FIG. 6 is a structural view of a second embodiment of a sewing machine without a swing seat according to the present application.

Reference numerals: the cloth feeding and stitch length adjusting mechanism 10, a driving source 11, a front output shaft 121, a rear output shaft 122, a follower plate 13, a limiting part 131, an outer rotating plate 14, an inner sliding plate 15, a sliding part 16, a connecting shaft 17, a static positioning wheel 18, a through hole 181, a stitch length adjusting and positioning groove 182, a stitch length adjusting groove 183, a positioning groove 184, a first transition groove 185, a second transition groove 186, a cloth feeding tooth 191, a needle plate 192, a thread cutting mechanism 20, a thread cutting fork wheel 21, a return rod 211, a thread cutting rod 212, a thread cutting eccentric wheel 22, a pushing piece 221, a thread cutting rotating shaft 23, a thread cutting tail end 24, a presser foot lifting mechanism 30, a presser foot lifting cam 31, a presser foot lifting rod 32 and a cloth feeding shaft 41.

Detailed Description

Preferred embodiments of the present application will be described in detail below with reference to fig. 1 to 6, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application will be clearly and clearly defined, and these embodiments are only for illustrating the present invention and are not limited thereto.

Example one

In fig. 1-5, the present application provides a sewing machine without a swing seat, the sewing machine includes a driving source 11, a cloth feeding and needle pitch adjusting mechanism 10, a thread cutting mechanism 20 and a presser foot lifting mechanism 30, the driving source 11 has a front output shaft 121 to which the cloth feeding and needle pitch adjusting mechanism 10 is mounted, the driving source 11 has a rear output shaft 122 to which the thread cutting mechanism 20 and the presser foot lifting mechanism 30 are mounted, the driving source 11 executes the above three sewing actions in different time periods, and the actions are not interfered and affected.

The sewing machine without the swing seat means that the sewing machine can realize normal sewing work without the swing seat, and the specific scheme is that the sewing machine can carry out stitch length adjustment action on a cloth feeding and stitch length adjusting mechanism 10 under the driving of a driving source 11 in a back-and-forth transfer rotation mode; the driving source 11 performs the zero point position positioning operation of the feed dog 191 on the feed and stitch length adjusting mechanism 10 in a rotating manner, and can also perform the thread trimming operation of the thread trimming mechanism 20 and the presser foot lifting operation of the presser foot lifting mechanism 30 under the driving of the same driving source 11, so as to achieve the technical purpose of positioning the zero point position of the feed dog 191 of the sewing machine, wherein the zero point position positioning of the feed dog 191 is the zero stitch length state that the feed dog 191 is under the needle plate 192. The driving source 11 is fixed to a sewing machine body. The cloth feeding and stitch length adjusting mechanism 10 has a stationary positioning wheel 18, the stationary positioning wheel 18 is fixed to the machine body, and the driving source 11 is fixed to the stationary positioning wheel 18. In this embodiment, the drive source 11 is preferably a stepping motor or a servo motor.

The cloth feeding and stitch length adjusting mechanism 10 further comprises a driving source 11, a static positioning wheel 18, a follower plate 13, an outer rotating plate 14, an inner sliding plate 15, a sliding piece 16, a connecting shaft 17, a cloth feeding shaft 41 and a cloth feeding tooth 191. The feed shaft 41 is indirectly connected to the feed dog 191. The stationary positioning wheel 18 is fixed and stationary in its functional state, the front output shaft 121 of the driving source 11 passes through a through hole 181 provided in the stationary positioning wheel 18, the driving source 11 does not apply work to the stationary positioning wheel 18, and the through hole 181 is in a non-contact relationship with the front output shaft 121.

A slider 16 is connected to the inner slide plate 15 and passes through the outer rotary plate 14, the slider 16 faces the drive source 11, and protrudes inside the needle pitch adjusting and positioning groove 182 provided in the stationary positioning wheel 18, and the drive source 11 causes the slider 16 to follow the shape of the inside in the needle pitch adjusting and positioning groove 182 by driving the outer rotary plate 14 in a back and forth rotation manner. The passive slider 16 is indirectly transmitted to the feed shaft 41 to swing back and forth, and the feed shaft 41 swings back and forth enough to meet the requirement of the feed dog 191 to generate the feed motion. The sliding part 16 indirectly transmits back and forth swinging with the cloth feeding shaft 41 and is completed by the cooperation of an inner sliding plate 15, an outer rotating plate 14, a connecting shaft 17 and a follow-up plate 13. An outer rotating plate 14 is fixed on a front output shaft 121 of the driving source 11, an inner sliding plate 15 is matched with an inner gap of the outer rotating plate 14, the upper part of the inner sliding plate 15 is connected with a sliding part 16, the lower part of the inner sliding plate 15 is connected with a connecting shaft 17, the connecting shaft 17 is movably connected with a connecting follow-up plate 13, and the follow-up plate 13 is fixedly connected with a cloth feeding shaft 41. The connecting shaft 17 is movably connected in the limiting part 131 of the following plate 13. The outer rotating plate 14 has a shaft hole 141 to which the cloth feeding driving source 11 is fixedly connected.

The stationary positioning wheel 18 has a through hole 181 and a front output shaft 121 concentrically arranged, and the through hole 181 is located inside a needle pitch adjusting and positioning groove 182. The static positioning wheel 18 has a pitch adjusting and positioning groove 182, the pitch adjusting and positioning groove 182 is a closed groove, the pitch adjusting and positioning groove 182 has a pitch adjusting groove 183, a positioning groove 184, and a first transition groove 185 and a second transition groove 186 between the pitch adjusting groove 183 and the positioning groove 184, the pitch adjusting groove 183 is for pitch adjustment, and the positioning groove 184 is for positioning zero position.

When the sewing machine performs the zero position operation, the needle pitch of the feed dog 191 is adjusted when the slider 16 reaches the needle pitch adjusting groove 183, in other words, the action position between the slider 16 and the needle pitch adjusting groove 183 is changed to realize a new needle pitch determined by the back-and-forth rotation angle of the driving source 11, and the feed dog 191 finally performs sewing at the new needle pitch. The pitch groove 183 is preferably arc-shaped, and may be flat or wavy, and the technical effect is the same. The slider 16 is under the drive source 11 with back and forth drive, slider 16 is at gauge needle adjustment groove 183 back and forth swing, set up reasonable length with gauge needle adjustment groove 183 and just can realize the multiple regulation of gauge needle, the range of slider 16 back and forth swing is the transport angle degree that the drive source 11 comes the gyration promptly, the size of gauge needle has been decided to drive source 11 transport angle degree size, consequently, the sewing machine of this application has more nimble regulation mode in adjusting the gauge needle, can realize totally that a plurality of different gauge needles are being adjusted easily at a sewing machine.

When the sewing machine is to perform stitch length adjustment, the slider 16 enters the positioning groove 184 from the stitch length adjustment groove 183 through the first transition groove 185 or the second transition groove 186 under the rotational driving of the driving source 11, and when the slider 16 reaches the positioning groove 184, the sewing machine realizes the determination of the zero position of the feed dog 191. The positioning groove 184 and the front output shaft 121 are arranged in a concentric circle, and the front output shaft 121 with the determined zero position is concentric with the connecting shaft 17, so that the sliding piece 16 can rotate on the positioning groove 184, the front output shaft 121 cannot generate thrust to the inner sliding plate 15 and the outer rotating plate 14, the determination of the zero position of the feed dog 191 effectively solves the problem of inaccurate zero position positioning of the existing sewing machine, the sewing stability is improved, and the sewing quality is improved. In summary, the sewing machine of the present application can realize all functions of the swing seat without the swing seat, and can realize normal sewing work without the swing seat.

The driving source 11 performs the thread cutting operation of the thread cutting mechanism 20 and the presser foot lifting operation of the presser foot lifting mechanism 30 within the time of the positioning groove 184.

Referring to fig. 1 and fig. 2 of the drawings, a sewing machine without a swing seat of the present application includes a thread trimming mechanism 20 and a presser foot lifting mechanism 30. When the sewing machine finishes sewing, the thread cutting operation is required to be executed first and then the presser foot lifting operation is executed, and the operation is executed by the rear output shaft 122 when the front output shaft 121 of the driving source 11 moves the slider 16 to the positioning groove 184.

The thread trimming mechanism 20 described above has a thread trimming fork 21, a thread trimming eccentric 22, and a thread trimming end execution end 24, and the thread trimming eccentric 22 is mounted on the rear output shaft 122 of the drive source 11. The presser foot raising mechanism 30 includes a presser foot raising cam 31, a presser foot raising ram 32, and a presser foot raising end execution end, and the presser foot raising cam 31 is attached to a rear output shaft 122 of the drive source 11. The lifting presser foot cam 31 is arranged at the outermost side of the rear output shaft 122, and the rear output shaft 122 for fixing the lifting presser foot cam 31 penetrates through the machine body.

The thread cutting fork wheel 21 is fixedly connected to the thread cutting rotating shaft 23, and the other end of the thread cutting rotating shaft 23 is connected to the thread cutting end execution end 24. The eccentric position of the trimming eccentric wheel 22 is provided with a pushing piece 221, the trimming fork wheel 21 is provided with a return rod 211 and a trimming rod 212, the pushing piece 221 is positioned between the return rod 211 and the trimming rod 212, the driving source 11 drives the pushing piece 221 of the rear output shaft 122 to rotate and press the trimming rod 212 downwards to transmit force to the trimming end execution end 24 for trimming, and the trimming end execution end 24 completes trimming. After the trimming is completed, the driving source 11 continues to drive the pushing member 211 to rotate to the return rod 211, and the return rod 211 is returned to the original position, so that the resetting of the whole trimming mechanism 20 is completed.

After the thread cutting is finished, the sewing machine immediately performs the action of lifting the presser foot. The circular arc surface of the presser foot lifting cam 31 is a free rotation surface, and the cam surface of the presser foot lifting cam 31 is a lifting surface for the presser foot lifting operation. The driving source 11 drives the rear output shaft 122 to rotate the presser foot lifting cam 31 to lift the presser foot lifting mandril 32 by using the lifting surface, and the presser foot lifting mandril 32 prompts the presser foot lifting tail end execution end to execute the presser foot lifting action.

Example two

In fig. 6, the second embodiment is substantially the same as the first embodiment except that the mechanism for mounting the front output shaft 121 and the rear output shaft 122 of the drive source 11 is different. A thread cutting fork wheel 21 of the thread cutting mechanism 20 is arranged on the front output shaft 121; the rear output shaft 122 is provided with a pressure lifting pin cam 31 of the pressure lifting pin mechanism 30, the rear output shaft 122 passes through the machine body and a static positioning wheel 18 arranged on the machine body, and the tail end of the rear output shaft 122 is provided with an outer rotating plate 14 to adapt to various sewing machine types, so that the technical effects are the same.

The above description is only one of the preferred embodiments of the present application, and not intended to limit the scope of the present application, and all modifications that can be made to the equivalent structure or equivalent flow path by using the shape, structure and principle of the present application and the accompanying drawings, or applied to other related fields directly or indirectly are included in the scope of the present application.

Claims (10)

1. A sewing machine without a swing seat is provided with a driving source (11), a cloth feeding shaft (41), a cloth feeding tooth (191), a thread cutting mechanism (20) and a presser foot lifting mechanism (30), and is characterized in that the sewing machine is further provided with the cloth feeding and needle pitch adjusting mechanism (10), an outer rotating plate (14) of the cloth feeding and needle pitch adjusting mechanism (10) is installed on a front output shaft (121) of the driving source (11), the driving source (11) drives the outer rotating plate (14) in a back-and-forth rotation driving mode, the outer rotating plate (14) is connected with the cloth feeding shaft (41), the cloth feeding shaft (41) is indirectly connected with the cloth feeding tooth (191), and the thread cutting mechanism (20) and the presser foot lifting mechanism (30) are installed on a rear output shaft (122) of the driving source (11).

2. The sewing machine without oscillating seat according to claim 1, characterized in that the feed and stitch length adjusting mechanism (10) has a static positioning wheel (18), the static positioning wheel (18) is fixed on the machine body, the front output shaft (121) of the driving source (11) passes through a through hole (181) of the static positioning wheel (18), the through hole (181) of the static positioning wheel (18) and the front output shaft (121) are arranged in concentric circles, and the through hole (181) is located inside the stitch length adjusting and positioning groove (182).

3. A sewing machine without oscillating seat according to claim 1 or 2, characterized in that the feed and gauge adjustment mechanism (10) further comprises a follower plate (13), an outer rotating plate (14), an inner sliding plate (15), a slider (16) and a connecting shaft (17), the slider (16) is connected to the inner sliding plate (15) and passes through the outer rotating plate (14), the slider (16) faces the driving source (11) and extends into the gauge adjustment and positioning groove (182) of the static positioning wheel (18), the driving source (11) drives the outer rotating plate (14) in a back and forth manner to allow the slider (16) to move passively in the gauge adjustment and positioning groove (182) following the shape of the inner, the inner gap of the outer rotating plate (14) is matched with the inner sliding plate (15), the upper part of the inner sliding plate (15) is connected to the slider (16), the lower part of the inner sliding plate (15) is connected to the connecting shaft (17), the connecting shaft (17) is connected to the connecting follower plate (13) in an oscillating manner, the follower plate (13) is fixedly connected to the feed shaft (41), and the connecting shaft (17) is connected to the inner rotating plate (11) for fixedly connecting shaft (141) for connecting the feed to the follower plate (11).

4. A bobbinless sewing machine according to claim 3, wherein the pitch control and positioning slot (182) has a pitch control slot (183), a positioning slot (184) and a first transition slot (185) and a second transition slot (186) between the pitch control slot (183) and the positioning slot (184), the pitch control and positioning slot (182) is a closed groove, the pitch control slot (183) is a pitch control function, the positioning slot (184) is a positioning zero function, the positioning zero position is a zero pitch state in which the feed dog (191) is below the needle plate (192), and the driving source (11) is fixedly connected to the stationary positioning wheel (18).

5. A bobbinless sewing machine as claimed in claim 3, characterized in that the pitch control channel (183) is of a reasonable length to allow a plurality of adjustments of the pitch, the amplitude of the back and forth oscillation of the slider (16) is the angle of rotation of the drive source (11), the degree of rotation of the drive source (11) determines the pitch, the pitch control channel (183) is preferably circular, additionally provided or at a flat angle and/or in a wave shape.

6. A bobbinless sewing machine as claimed in claim 4, wherein the positioning groove (184) is concentrically arranged with respect to the front output shaft (121), the front output shaft (121) is concentrically arranged with respect to the connecting shaft (17), and the driving source (11) performs the thread cutting operation of the thread cutting mechanism (20) and the presser foot lifting operation of the presser foot lifting mechanism (30) within a time period of the positioning groove (184).

7. A bobbinless sewing machine as claimed in claim 1, characterized in that said drive source (11) is fixed to the body of the sewing machine, said drive source (11) preferably using a stepping motor or a servo motor.

8. The sewing machine without the swinging seat as claimed in claim 1, wherein the thread cutting mechanism (20) has a thread cutting fork wheel (21), a thread cutting eccentric wheel (22) and a thread cutting end execution end (24), the thread cutting eccentric wheel (22) is mounted on a rear output shaft (122) of the driving source (11), the thread cutting fork wheel (21) is fixedly connected to the thread cutting rotating shaft (23), the other end of the thread cutting rotating shaft (23) is connected with the thread cutting end execution end (24), a pushing member (221) is arranged at an eccentric position of the thread cutting eccentric wheel (22), the thread cutting fork wheel (21) has a return rod (211) and a thread cutting rod (212), the pushing member (221) is positioned between the return rod (211) and the thread cutting rod (212), the driving source (11) drives the pushing member (221) of the rear output shaft (122) to rotate to press the thread cutting end (24) to transmit the thread cutting force to the thread cutting end (24) so as to complete the thread cutting action, the thread cutting action is completed by the thread cutting end (24), the driving source (11) drives the pushing member (11) to rotate to return the actuating end (211) to complete the thread cutting action, and the whole thread cutting mechanism (211).

9. The sewing machine without the swing seat according to claim 1, wherein the presser foot lifting mechanism (30) has a presser foot lifting cam (31), a presser foot lifting ejector rod (32) and a presser foot lifting end execution end, a rear output shaft (122) provided with the presser foot lifting cam (31) penetrates through the machine body, an arc surface of the presser foot lifting cam (31) is a hollow surface, a cam surface of the presser foot lifting cam (31) is a jacking surface of the presser foot lifting action, the driving source (11) drives the rear output shaft (122) to rotate the presser foot lifting cam (31) to realize jacking and lifting of the presser foot ejector rod (32) by using the jacking surface, the presser foot lifting ejector rod (32) prompts the presser foot lifting end execution end to execute the presser foot lifting action, and the presser foot lifting cam (31) is arranged at one end of the outermost side of the rear output shaft (122).

10. A sewing machine without oscillating seat according to claim 1, characterized in that the front output shaft (121) is provided with a thread-cutting fork wheel (21) of the thread-cutting mechanism (20); the rear output shaft (122) is provided with a pressure foot lifting cam (31) of a pressure foot lifting mechanism (30), the rear output shaft (122) penetrates through the machine body and a static positioning wheel (18) arranged on the machine body, and the tail end of the rear output shaft (122) is provided with an outer rotating plate (14).

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