CN214938344U - Feed dog assembly, thread cutting mechanism and presser foot lifting mechanism of sewing machine - Google Patents

Abstract

The application provides a feed dog subassembly of sewing machine, thread trimming mechanism and presser foot lifting mechanism, concretely relates to sewing machine makes technical field, the crank that the cloth feed subassembly was before and after the oscilaltion power supply drive that has is two between realizes that the feed dog produces the reciprocating motion action front and back, the multi-stage cam that the cloth feed subassembly was gone up and down to the drive of the cloth feed subassembly was gone up and down to realize indirectly that the feed dog produced the reciprocating motion action of going up and down by the preceding and following cloth feed power supply of preceding and following cloth feed power supply drive, the feed dog subassembly is driven the cloth feed action of executing sewing machine by the power supply of going up and down and is gone up and down jointly, the power supply of going up and down can also drive the presser foot action when the time machine, the drive of preceding and following cloth feed power supply also can drive the thread trimming action when the time machine. This application make full use of sewing machine's power supply, effectively improved the availability factor of sewing machine power, had higher use spreading value.

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 the important parts for realizing sewing thread running of the sewing machine. The company previously proposed a feed dog assembly for a split sewing machine, and particularly relates to the technical field of sewing machine manufacturing. The cloth feeding tooth assembly is provided with an up-down lifting motor and a front-back cloth feeding motor which apply a non-lateral swinging source to the cloth feeding tooth, the up-down lifting 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 the rotary table to drive the connecting rod, the connecting rod is movably connected to the eccentric position of the rotary table, and the connecting rod is movably connected with the 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 a power device for driving the thread cutting and presser foot lifting action needs to be additionally arranged, so that the manufacturing cost of the sewing machine is increased.

Disclosure of Invention

The sewing machine is characterized by comprising a cloth feeding tooth assembly, a thread cutting mechanism, a presser foot lifting mechanism, an up-down lifting power source and a front-back cloth feeding power source, wherein the cloth feeding tooth assembly comprises a front-back cloth feeding assembly and an up-down lifting cloth feeding assembly; the front and back cloth feeding power source drives the multi-stage cam I and the multi-stage cam II of the up-down lifting cloth feeding assembly to indirectly realize that the cloth feeding teeth generate up-down lifting reciprocating movement, and drives the trimming cam of the trimming mechanism and the trimming transmission bracket to realize trimming movement.

Preferably, the feed dog assembly is fixed on a feed dog fixing bracket of the sewing machine, the feed dog fixing bracket is fixed below a sewing machine base plate, the front and rear feed dog assemblies are arranged on the upper part of the feed dog fixing bracket, and the up-down lifting feed dog assembly is arranged on the lower part of the feed dog fixing bracket.

Preferably, the front and rear cloth feeding assemblies further comprise a cloth feeding tooth rack, a support shaft and a support, the cloth feeding tooth rack is located in the support, the support is arranged on the upper half portion of the cloth feeding tooth fixing support, the front and rear cloth feeding power sources are located on the side edge of the cloth feeding tooth rack, and the cloth feeding teeth are mounted on the upper portion of the cloth feeding tooth rack.

Preferably, support shafts are respectively arranged on two sides of the cloth feeding tooth frame, the support shafts are fixedly connected with the cloth feeding tooth frame to form a whole, the support shafts on the two sides extend to support shaft holes formed in two ends of the support, and the support shafts are in clearance fit with the support shaft holes.

Preferably, the crank I is hinged with the crank II, the crank II is hinged with the feed dog frame, and the front-back feed power source drives the crank I and the crank II to operate to generate a front-back swing source to act on the feed dog frame so as to realize the continuous front-back reciprocating feed action of the feed dog assembly.

Preferably, both sides of the feed dog fixing support are respectively provided with a limiting groove for the support to reciprocate back and forth, the limiting grooves are positioned at both ends of the feed dog fixing support, and the support integrally falls into the limiting grooves at both ends of the feed dog fixing support.

Preferably, the cloth feeding assembly capable of ascending and descending up and down further comprises a swing rod, a cross rod and a cloth feeding tooth fixing support, the cross rod is arranged at the middle position of the cloth feeding tooth fixing support approximately in the transverse direction, the cloth feeding tooth fixing support is of a U-shaped structure overall, the cloth feeding tooth fixing support is fixed below a sewing machine base plate, an ascending and descending power source is installed and fixed on the bottom of the cloth feeding tooth fixing support, output shafts at two ends of the ascending and descending power source are respectively provided with a multi-stage cam I and a multi-stage cam II, the multi-stage cam I and the multi-stage cam II are located at two ends of the bottom of the support respectively, and the ascending and descending power source of the cloth feeding assembly capable of ascending and descending up and down drives the multi-stage cam I and the multi-stage cam II to act on the bottom of the support to enable the support to generate a continuous ascending and descending swing source, so that the whole cloth feeding tooth generates continuous ascending and descending cloth feeding actions.

Preferably, the amplitude-swinging rod is fixed in the middle of the feed dog fixing support in a horizontal state, the amplitude-swinging rod is cylindrical, cross rods are arranged at the front and the back of the feed dog fixing support, amplitude-swinging holes are formed in the cross rods and correspond to the amplitude-swinging rods, and the up-down lifting power source drives the first multi-stage cam and the second multi-stage cam to act on the first salient point and the second salient point at the bottom of the support respectively.

Preferably, the trimming cam is fixedly installed on the outer side of the multi-stage cam, the trimming cam acts on the trimming transmission support, the trimming transmission support is connected with the rotating shaft, the rotating shaft is sleeved inside the trimming transmission installation seat, the other end of the rotating shaft is connected with the trimming end execution end, and the trimming action is executed by the trimming end execution end.

Preferably, the front and rear cloth feeding power source is provided with an output shaft provided with a presser foot lifting cam, the presser foot lifting cam acts on a top plate, the top plate is sleeved on a rotating shaft of the sewing machine base plate, the top plate indirectly enables a push rod to lift or descend under the action of the presser foot lifting cam, the push rod is transmitted to a presser foot lifting end execution end, and the presser foot lifting action is executed by the presser foot lifting end execution end.

Compared with the prior art, the novel sewing machine structure has the advantages that the cloth feeding tooth assembly is driven by the up-down lifting power source and the front-back cloth feeding power source together to execute the cloth feeding action of the sewing machine, the up-down lifting power source can also drive the presser foot lifting cam and the top plate of the presser foot lifting mechanism to realize the presser foot lifting action when the machine is in place, and the front-back cloth feeding power source drives the thread cutting cam and the thread cutting transmission bracket of the thread cutting mechanism to realize the thread cutting action when the machine is in place. This application make full use of sewing machine's power supply has effectively improved the availability factor of sewing machine power, has reduced sewing machine's manufacturing cost by a wide margin for sewing machine's intelligent control level can further improvement, has higher use spreading value.

Drawings

FIG. 1 is a perspective view 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. 2 is a side 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 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. 4 is a schematic view 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. 5 is a first crank and second crank position view of a feed dog assembly, a thread cutting mechanism and a presser foot lifting mechanism of a sewing machine according to the present application;

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

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

Reference numerals: the cloth feeding tooth assembly comprises a cloth feeding tooth assembly 1a, a trimming mechanism 1b, a presser foot lifting mechanism 1c, an up-down lifting power source 10, a multi-stage cam I11, a convex point I111, a multi-stage cam II 12, a convex point II 121, an output shaft 13, a trimming cam 14, a trimming transmission support 141, a trimming transmission mounting base 142, a trimming end execution end 143, a rotating shaft 144, a support shaft 15, a support 16, a support shaft hole 161, a swing rod 17, a cloth feeding tooth frame 18, a front-back cloth feeding power source 20, an output shaft 21, a crank I211, a crank II 212, a presser foot lifting cam 22, a top plate 23, a push rod 24, a presser foot end execution end 25, a cloth feeding tooth fixing support 30, a cross rod 31, a swing hole 311, a limiting groove 32, a bottom 33, a cloth feeding tooth 4, a sewing machine substrate 5, a front-back cloth feeding assembly 1a1 and an up-down lifting cloth feeding assembly 1a 2.

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.

The application provides a feed dog subassembly, thread trimming mechanism and presser foot lifting mechanism of sewing machine, this sewing machine has feed dog subassembly 1a, thread trimming mechanism 1b, presser foot lifting mechanism 1c, oscilaltion power supply 10 and front and back feed power supply 20 etc. feed dog subassembly 1a contains front and back feed subassembly 1a1 and oscilaltion feed subassembly 1a2, feed dog subassembly 1a is fixed on feed dog fixed bolster 30 of sewing machine, feed dog fixed bolster 30 is fixed under sewing machine base plate 5. The front and rear cloth feeding units 1a1 are installed on the upper portion of the feed dog fixing bracket 30, and the up-down cloth feeding unit 1a2 is installed on the lower portion of the feed dog fixing bracket 30. The feed dog assembly 1a is driven by the cooperation of the up-down lifting power source 10 and the front-back feed power source 20, and the feed dog assembly 1a is acted together to realize the feed sewing action of the sewing machine, so that the sewing machine has the advantages of novel structure, stable operation and low manufacturing difficulty. After the cloth feeding action is finished, the wire cutting mechanism 1b is driven by the up-down lifting power source 10 to execute the wire cutting action, and the presser foot lifting mechanism 1c is driven by the front-back cloth feeding power source 20 to execute the presser foot lifting action.

The front and rear cloth feeding assemblies 1a1 have the following specific structure: the front and rear cloth feeding units 1a1 have a front and rear cloth feeding power source 20, a first crank 211 and a second crank 212 connected to an output shaft 21 of the front and rear cloth feeding power source 20, a feed dog holder 18, a support shaft 15, a holder 16, and a feed dog fixing holder 30. The feed dog frame 18 is positioned in the bracket 16, the bracket 16 is arranged at the upper half part of the feed dog fixing bracket 30, the front and back feed power sources 20 are positioned at the side edge of the feed dog frame 18, the feed dog 4 is arranged at the upper part of the feed dog frame 18, and the feed dog 4 is driven to run together by the running of the feed dog frame 18. The first crank 211 is mounted on the output shaft 21 of the front and rear cloth feeding power source 20, the first crank 211 is hinged with the second crank 212, and the pressure raising and pressing foot cam 22 is further mounted on the output shaft 21 of the front and rear cloth feeding power source 20. The second crank 212 is hinged with the feed dog frame 18, and the front-back feed power source 20 drives the first crank 211 and the second crank 212 to operate to generate a front-back swinging source to act on the feed dog frame 18, so that the feed dog assembly 1a continuously generates a front-back reciprocating feed motion. The two sides of the feed dog frame 18 are respectively provided with a support shaft 15, the support shafts 15 are fixedly connected with the feed dog frame 18 into a whole, the support shafts 15 on the two sides extend to support shaft holes 161 arranged at the two ends of the bracket 16, and the support shafts 15 are in clearance fit with the support shaft holes 161. The support shaft 15 is positioned in clearance fit and then positioned at two ends of the bracket 16, so that the feed dog frame 18 is driven by the front and back feed power source 20 in the bracket 16, and the feed dog 4 generates the front and back reciprocating motion.

The two sides of the feed dog fixing support 30 are respectively provided with a limiting groove 32 for the support 16 to reciprocate back and forth, and the limiting grooves 32 on the two sides are arranged to ensure that the support 16 has a fixed running space for reciprocating back and forth under the driving of the front and back feed power sources 20. The stopper grooves 32 are provided at both ends of the feed dog fixing bracket 30, and the bracket 16 as a whole falls into the stopper grooves 32 at both ends of the feed dog fixing bracket 30.

The above-described up-down cloth feeding assembly 1a2 is described as follows: the vertical lift cloth feeding unit 1a2 includes a vertical lift power source 10, a first multi-stage cam 11, a second multi-stage cam 12, a swing lever 17, a cross bar 31, and a feed dog fixing bracket 30. The cross bar 31 is disposed at a middle position of the feed dog fixing bracket 30 in a horizontal direction, the feed dog fixing bracket 30 is generally in a U-shaped structure, the feed dog fixing bracket 30 is fixed under the sewing machine base plate 5, and the up-down lifting power source 10 is installed and fixed on a bottom 33 of the feed dog fixing bracket 30. The output shaft 13 at the two ends of the up-down lifting power source 10 is respectively provided with a multi-stage cam I11, a multi-stage cam II 12 and a trimming cam 14, and the trimming cam 14 is fixedly arranged at the outer side of the multi-stage cam I11. The multi-stage cam I11 and the multi-stage cam II 12 are respectively arranged at two ends of the bottom of the bracket 16, and the up-down lifting power source 10 drives the multi-stage cam I11 and the multi-stage cam II 12 to act on the bottom of the bracket 16 so as to enable the bracket 16 to generate a continuous lifting swing source and realize continuous up-down lifting cloth feeding action of the whole cloth feeding tooth 4.

The feed dog fixing bracket 30 further has a swing lever 17, and the swing lever 17 is fixed at the middle position of the feed dog fixing bracket 30 in a horizontal state. The swing rod 17 is cylindrical, the front and the back of the feed dog fixing support 30 are provided with transverse rods 31, the transverse rods 31 are provided with swing holes 311, the swing holes 311 are arranged corresponding to the swing rods 17, the swing holes 311 have operation spaces for the swing rods 17 to move up and down, and the swing of the swing source generated by the multi-stage cams I11 and the multi-stage cams II 12 is limited by the swing holes 311 of the feed dog fixing support 30. The first multi-stage cam 11 and the second multi-stage cam 12 are the same component, and the first salient point 111 and the second salient point 121 of the first multi-stage cam 11 and the second multi-stage cam 12 are also the same (shown in fig. 4). The up-down lifting power source 10 drives the multi-stage cam I11 and the multi-stage cam II 12 to respectively act on the convex points I111 and the convex points II 121 at the bottom of the bracket 16, so that the generated up-down lifting swing source is more effective, and the bracket 16 and the feed dog 4 generate up-down reciprocating movement.

In summary, the front and rear cloth feeding power source 20 performs the front and rear reciprocating movement on the cloth feeding dog 4, and the up and down lifting power source 10 performs the up and down reciprocating movement on the cloth feeding dog 4, so as to be commonly combined and used for the cloth feeding dog 4, so that the cloth feeding dog 4 forms the complete cloth feeding movement, and the normal sewing of the sewing machine is realized.

When the sewing operation of the sewing machine is to be completed, the up-down lifting power source 10 starts to perform the thread cutting operation first, and then the front and rear cloth feeding power sources 20 start to perform the presser foot lifting operation.

After the up-down lifting power source 10 finishes working on the feed dog 4, the thread trimming cam 14 mounted on the output shaft 13 of the up-down lifting power source 10 acts on the thread trimming transmission bracket 141, the thread trimming transmission bracket 141 is connected with the rotating shaft 144, the rotating shaft 144 is sleeved inside the thread trimming transmission mounting base 142, the other end of the rotating shaft 144 is connected with the thread trimming end execution end 143, and the thread trimming action is executed by the thread trimming end execution end 143. The up-down lifting power source 10 drives the trimming cam 14, the trimming cam 14 pushes the trimming transmission bracket 141 upwards, and the trimming transmission bracket 141 twists the rotating shaft 144 to act on the trimming end execution end 143 to execute the final trimming action.

When the above-mentioned thread trimming operation is completed, the front and rear cloth feeding power sources 20 perform the presser foot lifting operation immediately. A presser foot lifting cam 22 is mounted on an output shaft 21 at the rear end of the front and rear cloth feeding power source 20. The front and rear cloth feeding power source 20 is installed at the front of the sewing machine base plate 5, and the output shaft 21 extends to the rear of the sewing machine base plate 5. The presser foot lifting cam 22 acts on the top plate 23, the top plate 23 is sleeved on the rotating shaft 144 of the sewing machine base plate 5, the top plate 23 indirectly enables the ejector rod 24 to lift up or descend under the action of the presser foot lifting cam 22, the ejector rod 24 transmits the presser foot lifting end execution end 25, and the presser foot lifting end execution end 25 executes the presser foot lifting action.

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 (10)

1. A sewing machine is provided with a feed dog (4) and is characterized by comprising a feed dog component (1a), a thread cutting mechanism (1b), a presser foot lifting mechanism (1c), an up-down power source (10) and a front-back feed power source (20), wherein the feed dog component (1a) comprises a front-back feed component (1a1) and an up-down feed component (1a2), and the up-down power source (10) drives a crank I (211) and a crank II (212) of the front-back feed component (1a1) to indirectly realize that the feed dog (4) generates front-back reciprocating movement and drives a presser foot lifting cam (22) and a top plate (23) of the presser foot lifting mechanism (1c) to realize the presser foot lifting action; the front and back cloth feeding power source (20) drives the multi-stage cam I (11) and the multi-stage cam II (12) of the up-down lifting cloth feeding assembly (1a2) to indirectly realize that the cloth feeding tooth (4) generates up-down lifting reciprocating movement, and drives the trimming cam (14) and the trimming transmission bracket (141) of the trimming mechanism (1b) to realize trimming movement.

2. The feed dog assembly, the thread trimming mechanism and the presser foot lifting mechanism of the sewing machine as claimed in claim 1, wherein the feed dog assembly (1a) is fixed to a feed dog fixing bracket (30) provided in the sewing machine, the feed dog fixing bracket (30) is fixed below a sewing machine base plate (5), the front and rear feed dogs (1a1) are installed on an upper portion of the feed dog fixing bracket (30), and the up-down feed dog assembly (1a2) is installed on a lower portion of the feed dog fixing bracket (30).

3. The feed dog assembly, the thread trimming mechanism and the presser foot lifting mechanism of the sewing machine as claimed in claim 1, wherein said front and rear feed dogs (1a1) further have a feed dog carrier (18), a support shaft (15) and a bracket (16), said feed dog carrier (18) is located in the bracket (16), the bracket (16) is disposed at the upper half portion of the feed dog fixing bracket (30), the front and rear feed power sources (20) are located at the side of the feed dog carrier (18), and the feed dog (4) is mounted at the upper portion of the feed dog carrier (18).

4. The feed dog assembly, the thread trimming mechanism and the presser foot lifting mechanism of the sewing machine as claimed in claim 3, wherein the feed dog frame (18) is provided with support shafts (15) at both sides thereof, the support shafts (15) are fixedly connected with the feed dog frame (18) to form a whole, the support shafts (15) at both sides extend to support shaft holes (161) formed at both ends of the support frame (16), and the support shafts (15) are in clearance fit with the support shaft holes (161).

5. The feed dog assembly, the thread trimming mechanism and the presser foot lifting mechanism of the sewing machine as claimed in claim 1, wherein the first crank (211) is hinged to the second crank (212), the second crank (212) is hinged to the feed dog frame (18), and the forward and backward feed power source (20) drives the first crank (211) and the second crank (212) to operate to generate a forward and backward swinging source to act on the feed dog frame (18) so as to realize the continuous forward and backward reciprocating feed motion of the feed dog assembly (1 a).

6. The feed dog assembly, the thread trimming mechanism and the presser foot lifting mechanism of the sewing machine as claimed in claim 3, wherein both sides of the feed dog fixing bracket (30) are respectively provided with a limiting groove (32) for the bracket (16) to reciprocate back and forth, the limiting grooves (32) are located at both ends of the feed dog fixing bracket (30), and the bracket (16) integrally falls into the limiting grooves (32) at both ends of the feed dog fixing bracket (30).

7. The feed dog assembly, the thread trimming mechanism and the presser foot lifting mechanism of the sewing machine as claimed in claim 2, wherein the up-down elevating feed dog assembly (1a2) further comprises a swing lever (17), a cross bar (31) and a feed dog fixing bracket (30), the cross bar (31) is arranged at a position substantially in the middle of the feed dog fixing bracket (30) in the transverse direction, the feed dog fixing bracket (30) is generally in a U-shaped structure, the feed dog fixing bracket (30) is fixed below the sewing machine base plate (5), the up-down elevating power source (10) is installed and fixed on the bottom (33) of the feed dog fixing bracket (30), the output shafts (13) at both ends of the up-down elevating power source (10) are respectively provided with a multi-stage cam one (11) and a multi-stage cam two (12), the multi-stage cam one (11) and the multi-stage cam two (12) are respectively arranged at both ends of the bottom of the feed dog fixing bracket (16), the up-down lifting power source (10) of the up-down lifting cloth feeding assembly (1a2) drives the multi-stage cam I (11) and the multi-stage cam II (12) to act on the bottom of the support (16) so that the support (16) generates a continuous lifting swing source, and the continuous up-down lifting cloth feeding action of the whole cloth feeding tooth (4) is realized.

8. The feed dog assembly, the thread trimming mechanism and the presser foot lifting mechanism of the sewing machine according to claim 7, wherein the amplitude-swinging rod (17) is fixed at the middle position of the feed dog fixing support (30) in a horizontal state, the amplitude-swinging rod (17) is cylindrical, the front and the back of the feed dog fixing support (30) are respectively provided with a cross rod (31), the cross rod (31) is provided with a swing amplitude hole (311), the swing amplitude hole (311) is arranged corresponding to the swing amplitude rod (17), and the up-and-down lifting power source (10) drives the first multi-stage cam (11) and the second multi-stage cam (12) to respectively act on the first salient point (111) and the second salient point (121) at the bottom of the support (16).

9. The feed dog assembly, the thread cutting mechanism and the presser foot lifting mechanism of the sewing machine as claimed in claim 1, wherein the thread cutting cam (14) is fixedly installed outside the first multi-stage cam (11), the thread cutting cam (14) acts on the thread cutting transmission bracket (141), the thread cutting transmission bracket (141) is connected with the rotating shaft (144), the rotating shaft (144) is sleeved inside the thread cutting transmission installation seat (142), the other end of the rotating shaft (144) is connected with the thread cutting end execution end (143), and the thread cutting action is executed by the thread cutting end execution end (143).

10. The cloth feeding tooth assembly, the thread cutting mechanism and the presser foot lifting mechanism of the sewing machine according to claim 1 are characterized in that a presser foot lifting cam (22) is mounted on an output shaft (21) of the front and rear cloth feeding power source (20), the presser foot lifting cam (22) acts on a top plate (23), the top plate (23) is sleeved on a rotating shaft (144) of a sewing machine base plate (5), the top plate (23) indirectly enables a push rod (24) to lift or descend under the action of the presser foot lifting cam (22), the push rod (24) is transmitted to a presser foot lifting end execution end (25) again, and the presser foot lifting action is executed by the presser foot lifting end execution end (25).

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