A sewing machine without swing seat

Abstract

The present application proposes a sewing machine without a swing seat, specifically relating to the technical field of sewing machine manufacturing. The sewing machine has a drive source, a cloth feed shaft, a cloth feed dog, a thread trimming mechanism, and a presser foot lifting mechanism. The sewing machine is characterized in that the sewing machine also has a cloth feed and stitch length adjustment mechanism. The front output shaft of the drive source is equipped with an outer rotating plate of the cloth feed and stitch length adjustment mechanism. The drive source drives the outer rotating plate in a rotary drive mode. The outer rotating plate is connected to the cloth feed shaft, and the cloth feed shaft is indirectly connected to the cloth feed dog. The sewing machine of the present application does not have a swing seat but has all the functions of a swing seat. Moreover, the stitch length adjustment mechanism has the function of adjusting multiple stitch lengths using a single drive source without having to replace parts such as the stitch length slot. This effectively improves the intelligent control level of the sewing machine and has a high value for use and promotion.

Description

Technical Field

[0001] The present application provides a sewing machine without a swing seat, and specifically relates to the technical field of sewing machine manufacturing. Background Art

[0002] The swing seat is an important and indispensable component in the traditional sewing machine structure for sewing. It is installed between the connecting rod and the feed shaft crank. In order to ensure the correspondence between the reverse stitch length and the forward stitch length, the stitch length adjustment function and the automatic reverse stitching function are both achieved by adjusting the angle of the swing seat. The stitch length adjustment of the swing seat is one of its important functions. The stitch length adjustment part drives the feed stud to adjust the angle of the swing seat in the front and back directions by rotating the stitch length dial, thereby achieving the change of stitch length; the automatic reverse stitching part drives the automatic reverse feed rod group through the automatic reverse feed electromagnet to drive the swing seat to a certain angle to achieve reverse stitching. Since the reverse stitch length is limited by the collision between the working arc surface of the adjuster and the head of the feed stud, long-term use will cause severe wear of the contact part between the stud and the feed adjuster, resulting in abnormal stitch length and affecting the sewing effect. At the same time, the noise of the swing seat is also relatively large when it is working.

[0003] In addition, the size of the stitch length of the swing seat with the needle length adjustment function is almost unique to a sewing machine. It is also difficult to implement the technical effect of multiple needles in the recently emerging sewing machines that use stepper motors to control and drive. Summary of the Invention

[0004] In response to the problems existing in the stitch length adjustment of the above-mentioned existing sewing machines, the present application specifically provides a sewing machine without a swing seat, which has a driving source, a cloth feed shaft and a feed dog, and is characterized in that the sewing machine also has a cloth feed and stitch length adjustment mechanism, and the front output shaft of the driving source is equipped with an outer rotating plate of the cloth feed and stitch length adjustment mechanism, and the driving source drives the outer rotating plate in a rotary driving manner, and the outer rotating plate is connected to the cloth feed shaft, and the cloth feed shaft is indirectly connected to the feed dog.

[0005] Preferably, the cloth feeding and stitch length adjustment mechanism has a static positioning wheel, which is fixed on the machine body, and the front output shaft of the driving source passes through the through hole of the static positioning wheel. The through hole of the static positioning wheel and the front output shaft are concentrically arranged, and the through hole is located inside the stitch length adjustment and positioning groove.

[0006] Preferably, the cloth feeding and stitch length adjustment mechanism also includes a follower plate, an outer rotating plate, an inner sliding plate, a sliding member and a connecting shaft. The sliding member is connected to the inner sliding plate and passes through the outer rotating plate. The sliding member faces the driving source and extends into the stitch length adjustment and positioning groove of the static positioning wheel. The driving source drives the outer rotating plate in a rotating manner so that the sliding member passively moves in the stitch length adjustment and positioning groove according to the internal shape. The internal gap of the outer rotating plate is matched with the inner sliding plate. The upper part of the inner sliding plate is connected to the sliding member, and the lower part of the inner sliding plate is connected to the connecting shaft. The connecting shaft and the connecting follower plate are dynamically connected. The follower plate is fixedly connected to the cloth feeding shaft. The connecting shaft is dynamically connected in the limiting part of the follower plate. The outer rotating plate has an axis hole for fixed connection of the cloth feeding driving source.

[0007] Preferably, the stitch length adjustment and positioning groove has a stitch length adjustment groove, a positioning groove and a transition groove one and a transition groove two located between the stitch length adjustment groove and the positioning groove. The stitch length adjustment and positioning groove is a closed groove. The stitch length adjustment groove is for stitch length adjustment, and the positioning groove is for zero position positioning. The positioning zero point position is the zero stitch length state when the feed dog is under the needle plate, and the driving source is fixedly connected to the static positioning wheel.

[0008] Preferably, the needle distance adjustment groove is set to a reasonable length to achieve various adjustments of the needle distance. The amplitude of the sliding member's back-and-forth swing is the operating angle of the driving source. The size of the driving source's operating angle determines the size of the needle distance. The shape of the needle distance adjustment groove is preferably arc-shaped, and additional setting options may be flat angles / or wavy.

[0009] Preferably, the positioning groove and the front output shaft are concentrically arranged, and the front output shaft is concentric with the connecting shaft, so that the driving source performs the thread trimming action of the thread trimming mechanism and the presser foot lifting action of the presser foot lifting mechanism within the positioning groove time.

[0010] Preferably, the driving source is fixed on the body of the sewing machine, and the driving source is preferably a stepping motor or a servo motor.

[0011] The thread trimming mechanism is equipped with a thread trimming fork wheel, a thread trimming eccentric wheel and a thread trimming terminal execution end, and the thread trimming eccentric wheel is installed on the rear output shaft of the driving source, and the thread trimming fork wheel is connected and fixed on the thread trimming rotating shaft, and the other end of the thread trimming rotating shaft is connected to the thread trimming terminal execution end, and a pushing member is provided on the eccentric position of the thread trimming eccentric wheel.

[0012] Preferably, the presser foot lifting mechanism has a presser foot lifting cam, a presser foot lifting push rod and a presser foot lifting terminal. The rear output shaft on which the presser foot lifting cam is installed passes through the machine body. The arc surface of the presser foot lifting cam is an idle surface. The cam surface of the presser foot lifting cam is a lifting surface for the presser foot lifting action. The driving source drives the rear output shaft to rotate the presser foot lifting cam and uses the lifting surface to lift the presser foot lifting push rod. The presser foot lifting push rod prompts the presser foot lifting terminal to perform the presser foot lifting action. The presser foot lifting cam is installed at the outermost end of the rear output shaft.

[0013] Preferably, the front output shaft is equipped with a thread trimming fork wheel of a thread trimming mechanism; the rear output shaft is equipped with a presser foot lifting cam of a presser foot lifting mechanism, the rear output shaft passes through the machine body and a static positioning wheel installed on the machine body, and an outer rotating plate is installed at the end of the rear output shaft.

[0014] Compared with the prior art, the brand-new sewing machine of the present application has a driving source, a cloth feed shaft and a cloth feed dog. The sewing machine also has a cloth feed and stitch length adjustment mechanism. The front output shaft of the driving source is equipped with an outer rotating plate of the cloth feed and stitch length adjustment mechanism. The driving source drives the outer rotating plate in a rotary driving manner. The outer rotating plate is connected to the cloth feed shaft, and the cloth feed shaft is indirectly connected to the cloth feed dog; the rear output shaft of the driving source is equipped with a thread trimming mechanism and a presser foot lifting mechanism. The sewing machine of the present application does not have a swing seat but has all the functions of a swing seat. Moreover, the stitch length adjustment mechanism has the function of using one driving source to achieve the adjustment of multiple stitch lengths without replacing parts such as the stitch length groove, which effectively improves the intelligent control level of the sewing machine and has a high value of use and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the cloth feeding and stitch length adjustment mechanism, thread trimming mechanism and presser foot lifting mechanism of a non-swing seat sewing machine of the present application;

[0016] Figure 2 This is a structural diagram of the cloth feeding and stitch length adjustment mechanism and thread trimming mechanism of a non-swinging seat sewing machine of the present application;

[0017] Figure 3 This is a schematic diagram of the cloth feeding and stitch length adjustment mechanism of a non-swing seat sewing machine of the present application;

[0018] Figure 4 This is a schematic diagram of the outer rotating plate and follower plate of a sewing machine without a swing seat of the present application;

[0019] Figure 5 This is a structural diagram of a static positioning wheel of a sewing machine without a swing seat according to the present application;

[0020] Figure 6 This is a structural diagram of a second embodiment of a sewing machine without a swing seat according to the present application.

[0021] Figure 1: Cloth feeding and stitch length adjustment mechanism 10, driving source 11, front output shaft 121, rear output shaft 122, follower plate 13, limiting portion 131, outer rotating plate 14, inner sliding plate 15, sliding member 16, connecting shaft 17, static positioning wheel 18, through hole 181, stitch length adjustment and positioning groove 182, stitch length adjustment groove 183, positioning groove 184, transition groove one 185, transition groove two 186, feed dog 191, needle plate 192, thread trimming mechanism 20, thread trimming fork wheel 21, return rod 211, thread trimming rod 212, thread trimming eccentric wheel 22, pushing member 221, thread trimming rotating shaft 23, thread trimming end execution end 24, presser foot lifting mechanism 30, presser foot lifting cam 31, presser foot lifting push rod 32, cloth feeding shaft 41. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-6 The preferred embodiments of the present application are described in detail so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present application. These embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0023] Example 1

[0024] exist Figure 1-5 In the present application, a sewing machine without a swing seat is proposed, which includes a driving source 11, a cloth feeding and stitch length adjusting mechanism 10, a thread trimming mechanism 20 and a presser foot lifting mechanism 30. The driving source 11 has a front output shaft 121 on which the cloth feeding and stitch length adjusting mechanism 10 is installed, and a rear output shaft 122 on which the driving source 11 is installed with the thread trimming mechanism 20 and the presser foot lifting mechanism 30. The driving source 11 performs the above three sewing actions in different time periods so that the actions do not interfere with or affect each other.

[0025] The present application discloses a sewing machine without a swing seat, meaning that the machine can still perform normal sewing operations without a swing seat. Specifically, the present application's sewing machine can not only adjust the stitch length of the cloth feed and stitch length adjustment mechanism 10 by rotating the drive source 11, but also position the feed dog 191 at zero position by the drive source 11. Furthermore, the same drive source 11 can also be used to drive the thread trimming mechanism 20 and the presser foot lifting mechanism 30, thereby achieving the technical purpose of positioning the feed dog 191 at zero position. The zero position of the feed dog 191 is defined as the zero stitch length position, where the feed dog 191 is below the needle plate 192. The drive source 11 is fixed to the body of the sewing machine. The cloth feed and stitch length adjustment mechanism 10 includes a static positioning wheel 18, which is fixed to the body of the sewing machine. The drive source 11 may be fixed to the static positioning wheel 18. In this embodiment, the driving source 11 is preferably a stepping motor or a servo motor.

[0026] The cloth feed and stitch length adjustment mechanism 10 also includes a drive source 11, a static positioning wheel 18, a follower plate 13, an outer rotating plate 14, an inner sliding plate 15, a slider 16, a connecting shaft 17, a cloth feed shaft 41, and a cloth feed dog 191. The cloth feed shaft 41 is indirectly connected to the cloth feed dog 191. The static positioning wheel 18 is fixed and remains stationary when in its functional state. The front output shaft 121 of the drive source 11 passes through a through hole 181 in the static positioning wheel 18. The drive source 11 does not exert any power on the static positioning wheel 18, and the through hole 181 and the front output shaft 121 are not in contact.

[0027] Slider 16 is connected to the inner sliding plate 15 and passes through the outer rotating plate 14. Slider 16 faces the drive source 11 and extends into the stitch adjustment and positioning slot 182 of the stationary positioning wheel 18. The drive source 11 rotates the outer rotating plate 14, causing slider 16 to passively move within the stitch adjustment and positioning slot 182, following the internal shape of the slot. This passive movement of slider 16 indirectly transmits a back-and-forth motion to the feed shaft 41. This back-and-forth motion of the feed shaft 41 is sufficient to generate the feed motion of the feed dog 191. The indirect transmission of this back-and-forth motion between slider 16 and the feed shaft 41 is accomplished through the coordinated efforts of the inner sliding plate 15, outer rotating plate 14, connecting shaft 17, and follower plate 13. The front output shaft 121 of the drive source 11 is fixed to the outer rotating plate 14. The inner sliding plate 15 fits within the gap within the outer rotating plate 14. The upper portion of the inner sliding plate 15 is connected to a sliding member 16, and the lower portion of the inner sliding plate 15 is connected to a connecting shaft 17. The connecting shaft 17 is dynamically connected to the follower plate 13, which is fixedly connected to the cloth feed shaft 41. The connecting shaft 17 is dynamically connected within a stopper 131 of the follower plate 13. The outer rotating plate 14 has a shaft hole 141 for the fixed connection of the cloth feed drive source 11.

[0028] The through hole 181 of the static positioning wheel 18 is concentrically arranged with the front output shaft 121. The through hole 181 is located within the stitch length adjustment and positioning groove 182. The static positioning wheel 18 has a stitch length adjustment and positioning groove 182, which is a closed groove. The stitch length adjustment and positioning groove 182 includes a stitch length adjustment groove 183, a positioning groove 184, and a transition groove 185 and a transition groove 186 located between the stitch length adjustment groove 183 and the positioning groove 184. The stitch length adjustment groove 183 is used for stitch length adjustment, and the positioning groove 184 is used for zeroing.

[0029] The sewing machine performs a zero-positioning action. When the slider 16 reaches the stitch length adjustment slot 183, the stitch length of the feed dog 191 is adjusted. In other words, the change in the working position between the slider 16 and the stitch length adjustment slot 183 to achieve a new stitch length is determined by the size of the back-and-forth rotation angle of the drive source 11, and the feed dog 191 ultimately sews at the new stitch length. The stitch length adjustment slot 183 is preferably in the shape of a circular arc, but can be set to a flat angle or a wavy shape, achieving the same technical effect. When the drive source 11 drives the slider 16 back and forth, the slider 16 swings back and forth in the stitch length adjustment slot 183. Setting the stitch length adjustment slot 183 to a reasonable length can achieve multiple stitch length adjustments. The amplitude of the back-and-forth swing of the slider 16 is the operating angle of the drive source 11, and the operating angle of the drive source 11 determines the size of the stitch length. Therefore, the sewing machine of the present application has a more flexible adjustment method for adjusting the stitch length, and it is entirely possible to easily adjust multiple different stitch lengths on a single sewing machine.

[0030] When the sewing machine is to perform stitch adjustment, the slider 16 is driven by the drive source 11 to rotate from the stitch adjustment groove 183 through the transition groove 185 or the transition groove 2 186 to the positioning groove 184. When the slider 16 reaches the positioning groove 184, the sewing machine has achieved the determination of the zero position of the feed dog 191. The positioning groove 184 and the front output shaft 121 are arranged concentrically. After the zero position is determined, the front output shaft 121 is concentric with the connecting shaft 17. Therefore, the rotation of the front output shaft 121 of the slider 16 on the positioning groove 184 will not generate a thrust on the inner sliding plate 15 and the outer rotating plate 14. The determination of the zero point position of the feed dog 191 effectively solves the problem of inaccurate zero position positioning in existing sewing machines, improves sewing stability, and thus improves sewing quality. In summary, the sewing machine of the present application can realize all the functions of the swing seat without a swing seat, and can achieve normal sewing work without a swing seat.

[0031] The driving source 11 thereby performs the thread trimming action of the thread trimming mechanism 20 and the presser foot lifting action of the presser foot lifting mechanism 30 within the positioning groove 184 time.

[0032] Refer to the attached Figure 1 Figure 2 The present invention relates to a non-swinging seat sewing machine comprising a thread trimming mechanism 20 and a presser foot lifting mechanism 30. When the sewing machine finishes sewing, the thread trimming mechanism 20 is required to be executed first and then the presser foot lifting mechanism 30. This action is performed 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.

[0033] The thread trimmer mechanism 20 comprises a thread trimmer fork wheel 21, a thread trimmer eccentric wheel 22, and a thread trimmer terminal 24. The thread trimmer eccentric wheel 22 is mounted on the rear output shaft 122 of the drive source 11. The presser foot lifter mechanism 30 comprises a presser foot lifter cam 31, a presser foot lifter push rod 32, and a presser foot lifter terminal. The presser foot lifter cam 31 is mounted on the rear output shaft 122 of the drive source 11. The presser foot lifter cam 31 is mounted on the outermost side of the rear output shaft 122, and the rear output shaft 122, to which the presser foot lifter cam 31 is fixed, passes through the machine body.

[0034] The trimming fork wheel 21 is fixedly connected to the trimming shaft 23, the other end of which is connected to the final trimming end 24. A pusher 221 is provided eccentrically of the trimming eccentric wheel 22. The trimming fork wheel 21 includes a return lever 211 and a trimming lever 212. The pusher 221 is positioned between the return lever 211 and the trimming lever 212. After the drive source 11 drives the output shaft 122, the pusher 221 rotates and presses down on the trimming lever 212, transmitting the force to the final trimming end 24 to complete the trimming operation. After the trimming operation is complete, the drive source 11 continues to rotate the pusher 211 to the return lever 211, which in turn returns the return lever 211 to its original position, thereby completing the reset of the entire trimming mechanism 20.

[0035] After thread trimming is complete, the sewing machine immediately performs the presser foot lift operation. The arc surface of the presser foot lift cam 31 serves as an idle surface, while the cam surface of the presser foot lift cam 31 serves as the lifting surface for the presser foot lift operation. After the drive source 11 drives the rear output shaft 122, the presser foot lift cam 31 is rotated, and the lifting surface is used to lift the presser foot lifter rod 32. The presser foot lifter rod 32 causes the presser foot lifter terminal to perform the presser foot lift operation.

[0036] Example 2

[0037] exist Figure 6 The second embodiment is substantially the same as the first embodiment, except that the front output shaft 121 and the rear output shaft 122 of the drive source 11 are mounted on different mechanisms. The front output shaft 121 is mounted with the thread trimming fork wheel 21 of the thread trimming mechanism 20; the rear output shaft 122 is mounted with the presser foot lifting cam 31 of the presser foot lifting mechanism 30. The rear output shaft 122 then passes through the machine body and the static positioning wheel 18 mounted thereon. The outer rotating plate 14 is mounted at the end of the rear output shaft 122 to accommodate various sewing machine models, achieving the same technical effect.

[0038] The above is only one of the preferred implementation methods of this application, and does not limit the scope of patent implementation of this application. Any equivalent structure or equivalent process transformation based on the shape, structure, and principle of the description and drawings of this application, or direct or indirect application in other related technical fields, is included in the scope of patent protection of this application.

Claims

1. A sewing machine without a swing seat, comprising a driving source (11), a cloth feed shaft (41) and a cloth feed dog (191), characterized in that: The sewing machine further comprises a cloth feeding and stitch length adjusting mechanism (10), wherein the front output shaft (121) of the driving source (11) is provided with an outer rotating plate (14) of the cloth feeding and stitch length adjusting mechanism (10), the driving source (11) drives the outer rotating plate (14) in a rotary driving manner, the outer rotating plate (14) is connected to a cloth feeding shaft (41), and the cloth feeding shaft (41) is indirectly connected to a cloth feeding dog (191); The cloth feeding and needle distance adjustment mechanism (10) has a static positioning wheel (18), which is fixed to the machine body in a fixed manner. 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 concentrically arranged. The through hole (181) is located inside the needle distance adjustment and positioning groove (182). The cloth feeding and needle distance adjustment mechanism (10) further comprises a follower plate (13), an outer rotating plate (14), an inner sliding plate (15), a sliding member (16) and a connecting shaft (17). The sliding member (16) is connected to the inner sliding plate (15) and passes through the outer rotating plate (14). The sliding member (16) faces the driving source (11) and extends into the needle distance adjustment and positioning groove (182) of the static positioning wheel (18). The driving source (11) drives the outer rotating plate (14) in a rotary manner so that the sliding member (16) moves in the needle distance adjustment and positioning groove (182) along with the needle distance adjustment and positioning groove (182). The inner shape is for passive operation, 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 sliding member (16), the lower part of the inner sliding plate (15) is connected to the connecting shaft (17), the connecting shaft (17) and the connecting follower plate (13) are dynamically connected, the follower plate (13) is fixedly connected to the cloth feeding shaft (41), the connecting shaft (17) is dynamically connected in the limiting part (131) of the connecting follower plate (13), and the outer rotating plate (14) has a shaft hole (141) for fixed connection of the cloth feeding drive source (11); The driving source (11) is fixed on the body of the sewing machine, and the driving source (11) uses a stepping motor or a servo motor.

2. A sewing machine without a swing seat according to claim 1, characterized in that: The stitch length adjustment and positioning groove (182) comprises a stitch length adjustment groove (183), a positioning groove (184), a transition groove 1 (185) and a transition groove 2 (186) located between the stitch length adjustment groove (183) and the positioning groove (184). The stitch length adjustment and positioning groove (182) is a closed groove. The stitch length adjustment groove (183) is used for stitch length adjustment. The positioning groove (184) is used for zero-position positioning. The zero-position positioning is the zero-stitch length state where the feed dog (191) is below the needle plate (192). The driving source (11) is fixedly connected to the static positioning wheel (18). The positioning groove (184) and the front output shaft (121) are arranged concentrically.

3. A sewing machine without a swing seat according to claim 2, characterized in that: The amplitude of the sliding member (16) swinging back and forth is the operating angle of the driving source (11) rotating back and forth. The operating angle of the driving source (11) determines the size of the needle distance. The shape of the needle distance adjustment groove (183) is arc-shaped, flat-angled, or wavy.

4. The sewing machine without a swing seat according to claim 1, characterized in that: The invention also comprises a thread trimming mechanism (20) and a presser foot lifting mechanism (30). The rear output shaft (122) of the driving source (11) is provided with the thread trimming mechanism (20) and the presser foot lifting mechanism (30). The thread trimming mechanism (20) comprises a thread trimming fork wheel (21), a thread trimming eccentric wheel (22) and a thread trimming end execution end (24). The thread trimming eccentric wheel (22) is installed on the rear output shaft (122) of the driving source (11). The thread trimming fork wheel (21) is connected and fixed on the thread trimming rotating shaft (23). The other end of the thread trimming rotating shaft (23) is connected to the thread trimming end execution end (24). A pushing member ( The thread trimming fork wheel (21) comprises a return rod (211) and a thread trimming rod (212), and the pushing member (221) is located between the return rod (211) and the thread trimming rod (212). After the driving source (11) drives the pushing member (221) of the output shaft (122), the pushing member (221) rotates and presses the thread trimming rod (212) downward, transmitting the force of thread trimming to the thread trimming end execution end (24), and the thread trimming action is completed by the thread trimming end execution end (24). After the thread trimming is completed, the driving source (11) continues to drive the pushing member (221) to rotate to the return rod (211), and the return rod (211) is returned to its original position, thereby completing the reset of the entire thread trimming mechanism (20).

5. The sewing machine without swing seat according to claim 4, characterized in that: The front output shaft (121) is concentric with the connecting shaft (17), and the driving source (11) thereby performs the thread cutting action of the thread cutting mechanism (20) and the presser foot lifting action of the presser foot lifting mechanism (30) within the time of the positioning groove (184).

6. The sewing machine without swing seat according to claim 4, characterized in that: The presser foot lifting mechanism (30) comprises a presser foot lifting cam (31), a presser foot lifting push rod (32) and a presser foot lifting end execution end. The rear output shaft (122) on which the presser foot lifting cam (31) is installed passes through the machine body. The arc surface of the presser foot lifting cam (31) is an idle surface. The cam surface of the presser foot lifting cam (31) is a lifting surface for the presser foot lifting action. The driving source (11) drives the rear output shaft (122) to rotate the presser foot lifting cam (31) and use the lifting surface to lift the presser foot lifting push rod (32). The presser foot lifting push rod (32) prompts the presser foot lifting end execution end to perform the presser foot lifting action. The presser foot lifting cam (31) is installed at the outermost end of the rear output shaft (122).

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