CN215561114U - Feed dog assembly, thread cutting mechanism and presser foot lifting mechanism of sewing machine - Google Patents

Abstract

The application provides a work feed tooth subassembly, thread trimming mechanism and lift presser foot mechanism of sewing machine, concretely relates to sewing machine makes technical field, has power supply one and power supply two, its characterized in that, work feed tooth subassembly is driven jointly by power supply one and power supply two, and power supply one and power supply two act on the work feed tooth frame that work feed tooth subassembly has jointly and carry out sewing machine's work feed action. The novel feed dog assembly structure is provided, meanwhile, the thread cutting action and the presser foot lifting action are executed by the single power source I, and the thread cutting action and the presser foot lifting action are continuously executed after the power source I and the power source II jointly execute the cloth feeding action, so that the utilization rate of a power device of the sewing machine is improved, the intelligent control level of a power system of the sewing machine is further improved, the power source required by the thread cutting action and the presser foot lifting action is omitted, and the novel feed dog assembly structure has high popularization and use values.

Description

Feed dog assembly, thread cutting mechanism and presser foot lifting mechanism of sewing machine

Technical Field

The application provides a feed dog subassembly, thread trimming mechanism and lift presser foot mechanism of sewing machine, concretely relates to sewing machine makes technical field.

Background

The feed dog is one of essential parts for sewing machine to realize sewing work. The company previously provides a cloth feeding tooth assembly of a separate sewing machine, and the specific scheme is that a non-lateral swinging source is applied to the cloth feeding tooth by an up-down motor and a front-back cloth feeding motor which are arranged on the cloth feeding tooth assembly, the up-down motor and the front-back cloth feeding motor indirectly act on the cloth feeding tooth to perform cloth feeding action, the front-back cloth feeding motor drives a turntable and then drives a connecting rod, the connecting rod is movably connected to the eccentric position of the turntable, and the connecting rod is movably connected with a cloth feeding tooth connecting frame. The cloth feeding tooth assembly is transmitted to a swing source by utilizing an up-down lifting motor and a front-back cloth feeding motor, and the cloth feeding tooth assembly can be additionally arranged on a bottom thread mechanism and can be manufactured into a modularized matching manner to be used on various sewing machines. In the sewing machine, a thread cutting and presser foot lifting device needs to be additionally arranged, and power for driving the thread cutting and presser foot lifting is required to be additionally arranged, so that the manufacturing cost of the sewing machine is increased.

Disclosure of Invention

The feed dog assembly is driven by the first power source and the second power source together, and the first power source and the second power source act on a feed dog frame of the feed dog assembly together to execute feed action of the sewing machine.

Preferably, the output shaft of the second power source is provided with a crank; the output shaft of the first power source is provided with a synchronous belt wheel, the crank indirectly acts on the cloth feeding tooth frame to realize the front and back cloth feeding actions of the cloth feeding tooth assembly, and the synchronous belt wheel indirectly acts on the multi-stage cam I and the multi-stage cam II to realize the up and down cloth feeding actions of the cloth feeding tooth assembly.

Preferably, the crank mounted on the output shaft is hinged to the oscillating rod, the crank drives the oscillating rod to operate, the oscillating rod is hinged to the cloth feeding dental frame, a support shaft is arranged on the cloth feeding dental frame, the support shaft is in clearance fit with the cloth feeding dental frame, the support shaft extends out of the cloth feeding dental frame and extends to two ends of the support, and the cloth feeding dental frame operates in the support.

Preferably, a synchronous pulley is mounted on a front output shaft of the first power source, the synchronous pulley drives a second synchronous pulley and a third synchronous pulley to be connected with a first multi-stage cam and a second multi-stage cam through a synchronous belt, the first multi-stage cam and the second multi-stage cam are respectively arranged at two ends of the bottom of the support, and the first multi-stage cam and the second multi-stage cam are provided with a first salient point and a second salient point.

Preferably, the first multi-stage cam is fixed on the first rotating shaft and the second multi-stage cam is fixed on the second rotating shaft, and the first rotating shaft and the second rotating shaft are sleeved on the feed dog fixing support.

Preferably, a second gear is additionally arranged behind the fourth gear of the first rotating shaft or the third gear of the second rotating shaft, the additionally arranged second gear is meshed with the first gear, and the second gear is driven by the second gear and is connected with the fourth gear and the third gear in parallel.

Preferably, the feed dog fixing support is further provided with a first limiting support and a second limiting support, the first limiting support and the second limiting support can fix a first power source and a second power source, the first limiting support and the second limiting support are used for limiting the running position of the feed dog frame and/or the support, the feed dog assembly is further provided with a swing arm, and the feed dog fixing support is provided with a swing hole.

Preferably, a first gear is mounted on a front output shaft of the first power source, the first multi-stage cam is mounted on a first rotating shaft, the second multi-stage cam is mounted on a second rotating shaft, the first rotating shaft and the second rotating shaft penetrate through the feed dog fixing support, a fourth gear and a third gear are mounted on the first rotating shaft and the second rotating shaft of the feed dog fixing support, and the fourth gear is meshed with the third gear.

This application still advocates sewing machine's thread trimming mechanism and lifts presser foot mechanism, has power supply one, the thread trimming crank is installed to the preceding output shaft of power supply one, the thread trimming crank acts on the thread trimming fork arm, the thread trimming fork arm has thread trimming pole and return pole, the thread trimming crank has the axle sleeve, the axle sleeve is located between thread trimming pole and the return pole, is used the last execution end of thread trimming by the thread trimming fork arm again and realizes the thread trimming action.

Preferably, the shaft sleeve pushes the thread cutting rod to cut threads, the shaft sleeve pushes the return rod to return the threads, and the thread cutting rod and the return rod can be interchanged in the upper position and the lower position of the thread cutting fork rod.

Preferably, the rear output shaft of the first power source is provided with a pressure foot lifting cam, the cam part of the first power source for driving the pressure foot lifting cam to lift acts on a pressure foot lifting ejector rod, and then the pressure foot lifting ejector rod acts on the pressure foot lifting tail end execution end to execute pressure foot lifting action.

Compared with the prior art, the feed dog subassembly of this application fully embodies the feed dog subassembly and carries out sewing machine's feed function under power supply one and power supply two drives jointly, provides brand-new feed dog subassembly structure. Meanwhile, the thread cutting action of the thread cutting mechanism and the presser foot lifting action of the presser foot lifting mechanism are executed only by the first power source, the thread cutting action and the presser foot lifting action are executed by the first power source, and the thread cutting action and the presser foot lifting action are continuously executed after the first power source and the second power source jointly execute the cloth feeding action, so that the utilization rate of a power device of the sewing machine is improved, the intelligent control level of a power system of the sewing machine is further improved, the power source required by the thread cutting action and the presser foot lifting action is omitted, the manufacturing cost of the sewing machine is greatly reduced, and the popularization and use value is high.

Drawings

FIG. 1 is a general view of a feed dog assembly, a thread trimming mechanism and a presser foot lifting mechanism of a sewing machine of the present application;

FIG. 2 is a front view of a feed dog assembly of a sewing machine, a thread trimming mechanism and a presser foot lifting mechanism of the present application;

FIG. 3 is a view showing a feed dog assembly of a sewing machine according to the present application;

FIG. 4 is an exploded view of a feed dog assembly of a sewing machine, a thread trimming mechanism and a presser foot lifting mechanism of the present application;

FIG. 5 is a view of the feed dog swing lever position of the feed dog assembly, thread trimming mechanism and presser foot lifting mechanism of a sewing machine according to the present application;

FIG. 6 is a view of the support structure of a feed dog assembly, a thread trimming mechanism and a presser foot lifting mechanism of a sewing machine according to the present application;

FIG. 7 is a gear scheme diagram of a second embodiment of a feed dog assembly, a thread trimming mechanism and a presser foot lifting mechanism of a sewing machine according to the present application.

Reference numerals: the cloth feeding tooth assembly 10, the cloth feeding tooth frame 11, a multi-stage cam I12, a rotating shaft I121, a multi-stage cam II 13, a rotating shaft II 131, a swing rod 14, a supporting shaft 15, a support 16, a salient point I161, a salient point II 162, a swing hole 163, a limiting block I164, a limiting block II 165, a limiting support I166, a limiting support II 167, a swing rod 18, a thread cutting mechanism 20a, a presser foot lifting mechanism 20b, a presser foot lifting cam 21, a presser foot lifting ejector rod 22, a thread cutting crank 23, a shaft sleeve 231, a thread cutting fork rod 24, a thread cutting rod 241, a return rod 242, a thread cutting end execution end 25, a power source I30, a front output shaft 31, a rear output shaft 32, a power source II 40, an output shaft 41, a crank 42, a synchronous belt wheel 51, a synchronous belt wheel II 52, a synchronous belt wheel III 53, a cloth feeding tooth fixing support 6, a gear I71, a gear II 72, a gear III 73 and an IV gear 74.

Detailed Description

Preferred embodiments of the present application will be described in detail below with reference to fig. 1 to 7, 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. 1-6, the present application provides a feed dog assembly, a thread trimming mechanism and a presser foot lifting mechanism of a sewing machine, which comprises a feed dog assembly 10, a thread trimming mechanism 20a, a presser foot lifting mechanism 20b, a first power source 30 and a second power source 40. The feed dog assembly 10 is driven by the first power source 30 and the second power source 40 together, and the first power source 30 and the second power source 40 act on the feed dog assembly 10 together to execute the feed motion of the sewing machine, so that the feed dog assembly 10 has the feed function which is required by the sewing machine. After the cloth feeding action of the cloth feeding tooth assembly 10 is completed, the power source first 30 starts to drive the thread cutting mechanism 20a and the presser foot lifting mechanism 20b to execute the thread cutting action and the presser foot lifting action, firstly, a front output shaft 31 installed on the power source first 30 executes the thread cutting action of the thread cutting mechanism 20a, and then, a rear output shaft 32 installed on the power source first 30 executes the presser foot lifting action of the presser foot lifting mechanism 20 b. According to the sewing machine, the second power source 40 of the cloth feeding tooth assembly 10 is utilized to perform the presser foot lifting action and the thread cutting action after the cloth feeding action is completed, the power utilization rate of the sewing machine is improved, the power required for performing the original presser foot lifting action and the original thread cutting action is omitted, and the manufacturing cost of the sewing machine is greatly reduced.

A crank 42 is mounted on an output shaft 41 of the second power source 40; the output shaft 41 of the first power source 30 is provided with a synchronous belt wheel 51, the crank 42 indirectly acts on the feed dog frame 11 to realize the front and back feed motion of the feed dog assembly 10, the synchronous belt wheel 51 indirectly acts on the first multi-stage cam 12 and the second multi-stage cam 13 to realize the up and down feed motion of the feed dog assembly 10, and the front and back feed motion and the up and down feed motion simultaneously realize the feed motion of the sewing machine.

In the feeding motion corner area of the second power source 40, the crank 42 mounted on the output shaft 41 is hinged to the swing rod 18, the crank 42 drives the swing rod 18 to rotate, and the swing rod 18 is hinged to the feeding dog frame 11 to enable the output shaft 41 to generate a front-and-back moving swing source for the feeding dog frame 11. The cloth feeding tooth rack 11 is provided with a support shaft 15, the support shaft 15 is in clearance fit with the cloth feeding tooth rack 11, the support shaft 15 extends out of the cloth feeding tooth rack 11 and extends to two ends of a support 16, and the cloth feeding tooth rack 11 operates in the support 16. The second power source 40 drives the crank 42 to make the swing rod 18 and the feed dog 11 generate a forward and backward moving swing source.

A synchronous pulley 51 is mounted on the front output shaft 31 of the first power source 30, the synchronous pulley 51 drives a second synchronous pulley 52 and a third synchronous pulley 53 through a synchronous belt to be connected and act on the first multi-stage cam 12 and the second multi-stage cam 13 to realize the up-and-down cloth feeding action of the whole cloth feeding tooth assembly 10, and the first multi-stage cam 12 and the second multi-stage cam 13 are respectively positioned at two ends of the bottom of the bracket 16. The first power source 30 drives the second synchronous pulley 52 and the third synchronous pulley 53 in a power source cloth feeding action corner area, specifically, the first multi-stage cam 12 is fixed on the first rotating shaft 121 and the second multi-stage cam 13 is fixed on the second rotating shaft 131, and the first rotating shaft 121 and the second rotating shaft 131 are sleeved on the cloth feeding tooth fixing support 6. The first multi-stage cam 12 and the second multi-stage cam 13 are provided with a first salient point 161 and a second salient point 162, and the first salient point 161 and the second salient point 162 are driven by the first power source 30 to enable the bracket 16 to generate an up-down swinging source to the whole feed dog assembly 10.

The feed dog subassembly 10 of this application is fixed on feed dog fixed bolster 6, and above-mentioned feed dog subassembly 10 still has a pendulum width of cloth pole 14, pendulum width of cloth pole 14 is the cylinder type. The feed dog fixing support 6 has a swing hole 163, the swing hole 163 is provided to the swing rod 14 to provide a space for the vertical movement, and the swing of the swing source of the multi-stage cam one 12 and the multi-stage cam two 13 is limited by the swing hole 163 of the feed dog fixing support 6. In addition, the feed dog fixing support 6 is also provided with a first limiting support 166 and a second limiting support 167 which can fix the first power source 30 and the second power source 40, and the first limiting support 166, the second limiting support 167 and the feed dog fixing support 6 body form a whole. The feed dog fixing support 6 is further provided with a first limiting block 164 and a second limiting block 165, and the first limiting block 164 and the second limiting block 165 are used for limiting the operation position of the feed dog frame 11 and/or the support 16, so that the feed dog assembly 10 has a fixed operation structure.

After the cloth feeding operation of the sewing machine is completed, the first power source 30 starts to execute the thread cutting operation and the presser foot lifting operation. The front output shaft 31 of the power source I30 is provided with a thread cutting crank 23, the thread cutting crank 23 acts on the thread cutting fork rod 24, and then the thread cutting fork rod 24 acts on the thread cutting end execution end 25 to realize thread cutting. The thread cutting fork rod 24 is provided with a thread cutting rod 241 and a return rod 242, the thread cutting crank 23 is provided with a shaft sleeve 231, the shaft sleeve 231 is positioned between the thread cutting rod 241 and the return rod 242, the shaft sleeve 231 pushes the thread cutting rod 241 to cut threads, and the shaft sleeve 231 pushes the return rod 242 to return the threads. The above-mentioned thread trimming rod 241 and the return rod 242 can be interchanged in the up-down position of the thread trimming fork rod 24, and the technical effects achieved by the above-mentioned thread trimming rod 241 and the return rod 242 are the same.

The rear output shaft 32 of the power source one 30 is provided with a presser foot lifting cam 21, the cam part of the presser foot lifting cam 21 is driven by the power source one 30 to act on a presser foot lifting ejector rod 22, and then the presser foot lifting ejector rod 22 acts on a presser foot end execution end to execute the presser foot lifting action.

The operation corners of the second power source 40 where the cloth feeding action, the presser foot lifting action and the thread cutting action are located are a cloth feeding action corner area, a presser foot lifting action corner area and a thread cutting action corner area respectively. The sewing action sequence executed by the second power source 40 is a cloth feeding action, a thread cutting action and a presser foot lifting action. It is worth proposing that after the second power source 40 finishes the cloth feeding action and the sewing machine stops, the second power source 40 transfers the operation corner to execute the thread cutting action and the presser foot lifting action, in other words, the cloth feeding action, the presser foot lifting action and the thread cutting action are not overlapped in the corner area where the second power source 40 operates, and after the sewing machine stops, the thread is firstly cut and then the presser foot is lifted.

In the feed operation corner region, the crank 42 is hinged to the swing lever 18 to generate a forward and backward feed swing source to the feed dog 11. When the sewing is finished, the second power source 40 leaves from the cloth feeding action corner area and enters the presser foot lifting action corner area and the thread cutting action corner area. The idle circular arc surfaces of the first multi-stage cam 12 and the second multi-stage cam 13 contact below the support 16 when the first power source 30 executes a corner region of the presser foot lifting action and a corner region of the thread cutting action, so that the first power source 30 does not generate vertical lifting action on the support 16, and meanwhile, the second power source 40 is in a stop state, so that the whole feed dog assembly 10 is static. Similarly, when the second power source 40 operates in the cloth feeding motion corner region, the shaft sleeve 231 of the thread cutting crank 23 idles back and forth between the thread cutting rod 241 and the return rod 242 at the thread cutting fork rod 24; the circular arc surface of the presser foot lifting cam 21 is also idle to and fro on the presser foot lifting ejector rod 22, so that the cloth feeding action, the presser foot lifting action and the thread cutting action executed by the power source two 40 are not influenced mutually, and the actions are clear and distinct.

Example two

The second embodiment is substantially the same as the first embodiment, except that the first power source 30 is different from the first power source in the implementation of the swing source generated by the feed dog assembly 10. In fig. 7, the first power source 30 also realizes the sewing operation of the feed dog assembly 10 in a gear-driven manner. The front output shaft 31 of the first power source 30 is provided with a first gear 71, the first multi-stage cam 12 is arranged on the first rotating shaft 121, and the second multi-stage cam 13 is arranged on the second rotating shaft 131. The first rotating shaft 121 and the second rotating shaft 131 penetrate through the feed dog fixing support 6, a fourth gear 74 and a third gear 73 are installed on the first rotating shaft 121 and the second rotating shaft 131 penetrating through the feed dog fixing support 6, and the fourth gear 74 is meshed with the third gear 73. In this embodiment, a second gear 72 is additionally installed behind the fourth gear 74 of the first rotating shaft 121 or the third gear 73 of the second rotating shaft 131, the additional second gear 72 is meshed with the first gear 71, and the first gear 71 drives the second gear 72 to be connected with the fourth gear 74 and the third gear 73 in parallel.

Alternatively, the first gear 71 directly meshes with the second gear 72, and the second gear 72 is omitted, so that the above-mentioned technical effects can be achieved. Under the driving of the first power source 30, the first gear 71 mounted on the front output shaft 31 drives the first rotating shaft 121 or the second rotating shaft 131 through the second gear 72, which has the same technical effect of making the swing source generated by the feed dog assembly 10.

The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application, or which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (11)

1. A feed dog assembly of a sewing machine is provided with a first power source (30) and a second power source (40), and is characterized in that the feed dog assembly (10) is driven by the first power source (30) and the second power source (40) together, and the first power source (30) and the second power source (40) act on a feed dog frame (11) of the feed dog assembly (10) together to execute feed motion of the sewing machine.

2. The feed dog assembly of a sewing machine according to claim 1, wherein the second power source (40) has an output shaft (41) with a crank (42) mounted thereon; the output shaft (41) of the first power source (30) is provided with a synchronous belt wheel (51), the crank (42) indirectly acts on the feed dog frame (11) to realize the front and back feed actions of the feed dog assembly (10), and the synchronous belt wheel (51) indirectly acts on the multi-stage cam I (12) and the multi-stage cam II (13) to realize the up and down feed actions of the feed dog assembly (10).

3. The feed dog assembly of the sewing machine according to claim 2, wherein a crank (42) mounted on the output shaft (41) is hinged to the swing rod (18), the crank (42) drives the swing rod (18) to operate, the swing rod (18) is hinged to the feed dog carrier (11), a support shaft (15) is arranged on the feed dog carrier (11), the support shaft (15) is in clearance fit with the feed dog carrier (11), the support shaft (15) extends out of the feed dog carrier (11) and extends to two ends of the support (16), and the feed dog carrier (11) operates in the support (16).

4. The feed dog assembly of the sewing machine as claimed in claim 1, wherein a synchronous pulley (51) is mounted on a front output shaft (31) of the first power source (30), the synchronous pulley (51) drives a second synchronous pulley (52) and a third synchronous pulley (53) to connect a first multi-stage cam (12) and a second multi-stage cam (13) through a synchronous belt, the first multi-stage cam (12) and the second multi-stage cam (13) are respectively arranged at two ends of the bottom of the support (16), and the first multi-stage cam (12) and the second multi-stage cam (13) are provided with a first salient point (161) and a second salient point (162).

5. The feed dog assembly of the sewing machine according to claim 2 or 4, wherein the first multi-stage cam (12) is fixed on the first rotating shaft (121) and the second multi-stage cam (13) is fixed on the second rotating shaft (131), and the first rotating shaft (121) and the second rotating shaft (131) are sleeved on the feed dog fixing support (6).

6. The feed dog assembly of the sewing machine as claimed in claim 5, wherein a second gear (72) is additionally arranged behind a fourth gear (74) of the first rotating shaft (121) or a third gear (73) of the second rotating shaft (131), the additional second gear (72) is meshed with the first gear (71), and the first gear (71) drives the second gear (72) and links the fourth gear (74) and the third gear (73).

7. The feed dog assembly of the sewing machine according to claim 5, wherein the feed dog fixing support (6) further comprises a first limit support (166) and a second limit support (167) which can fix the first power source (30) and the second power source (40), the feed dog fixing support (6) further comprises a first limit block (164) and a second limit block (165), the first limit block (164) and the second limit block (165) are used for limiting the running position of the feed dog frame (11) and/or the support (16), the feed dog assembly (10) further comprises a swing amplitude rod (14), and the feed dog fixing support (6) comprises a swing amplitude hole (163).

8. The feed dog assembly of the sewing machine according to claim 7, wherein a first gear (71) is mounted on a front output shaft (31) of the first power source (30), the first multi-stage cam (12) is mounted on a first rotating shaft (121), the second multi-stage cam (13) is mounted on a second rotating shaft (131), the first rotating shaft (121) and the second rotating shaft (131) penetrate through the feed dog fixing support (6), a fourth gear (74) and a third gear (73) are mounted on the first rotating shaft (121) and the second rotating shaft (131) of the feed dog fixing support (6), and the fourth gear (74) and the third gear (73) are meshed.

9. The trimming mechanism and the presser foot lifting mechanism of the sewing machine are characterized by comprising a first power source (30), a trimming crank (23) is mounted on a front output shaft (31) of the first power source (30), the trimming crank (23) acts on a trimming fork rod (24), the trimming fork rod (24) is provided with a trimming rod (241) and a return rod (242), the trimming crank (23) is provided with a shaft sleeve (231), the shaft sleeve (231) is located between the trimming rod (241) and the return rod (242), and the trimming fork rod (24) acts on a trimming tail execution end (25) to achieve trimming.

10. The thread trimming mechanism and presser foot lifting mechanism of a sewing machine according to claim 9, wherein said bushing (231) pushes the thread trimming lever (241) to perform thread trimming, said bushing (231) pushes the return lever (242) to perform thread trimming return, and the upper and lower positions of the thread trimming lever (241) and the return lever (242) at the thread trimming fork lever (24) are interchangeable.

11. The thread trimming mechanism and the presser foot lifting mechanism of a sewing machine according to claim 9, wherein the rear output shaft (32) of the first power source (30) is provided with a presser foot lifting cam (21), the cam portion of the presser foot lifting cam (21) driven by the first power source (30) acts on the presser foot lifting ejector rod (22), and the presser foot lifting ejector rod (22) acts on the presser foot lifting tail end executing end to execute the presser foot lifting action.

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