CN113584730A - Sewing machine - Google Patents

Abstract

The application provides a sewing machine, concretely relates to sewing machine makes technical field. The application proposes that the feed dog driving region drives the feed dog mechanism by utilizing the feed dog motor and the feed lifting motor so as to realize that the feed dog has a feed function, the feed dog driving the feed dog mechanism is not indirectly pushed by utilizing the feed dog motor or/and the feed lifting motor entering the idle rotation region, and in the condition, the feed dog motor or/and the feed lifting motor is utilized to execute a thread cutting action or/and a presser foot lifting action. The sewing machine breaks through the traditional technical scheme, cancels the traditional cloth feeding connecting rod, the feed lifting tooth connecting rod and the transmission cam on the main shaft, and can shorten the manufacture of the feed lifting tooth shaft so as to reduce the manufacture cost; under the vertical axis that has cancelled original sewing machine for sewing machine reduce cost improves the intelligent control level to the gauge needle on making, thereby has improved sewing machine and has made up the quality, and the sewing machine technique of this application has higher using value widely.

Description

Sewing machine

Technical Field

The application provides a sewing machine, concretely relates to sewing machine makes technical field.

Background

In the driving mechanism of the sewing machine, a main shaft motor is arranged on a machine head of the sewing machine with a cloth feeding motor and a feed lifting motor, the main shaft motor is connected with an output main shaft, a transmission cam is fixedly arranged on the output main shaft, and the main shaft motor drives a cloth feeding connecting rod and a feed lifting connecting rod to move by eccentric rotation of the cam so as to provide cloth feeding power for a cloth feeding tooth. The cloth feeding connecting rod drives the cloth feeding shaft to rotate at a certain angle through the swinging seat component, and the feed lifting connecting rod drives the feed lifting rock shaft to swing at a certain angle through the feed lifting rock crank; the swing of the cloth feeding connecting rod and the cloth feeding shaft drives the cloth feeding tooth rack to swing so as to generate back-and-forth motion for the cloth feeding tooth; the feed dog connecting rod and the feed dog shaft swing to drive the feed dog fork on the feed dog shaft to swing so as to enable the feed dog to move up and down, and the forward and backward movement and the up and down movement are combined to form the feed action of the feed dog. The arrangement structure for providing power for the feed dog is complex and has high manufacturing cost.

Aiming at a swinging seat for controlling the needle pitch, a plurality of enterprises put forward an intelligent control technical scheme for realizing the cloth feeding needle pitch. The technical scheme provides a cloth feeding device which comprises a cloth feeding shaft driving source, a connecting crank, a cloth feeding shaft, a cloth feeding tooth rack and a cloth feeding tooth, wherein the cloth feeding shaft driving source is provided with an output shaft, the output shaft is provided with the oscillating rod, the oscillating rod is hinged with the crank, the connecting crank is fixed on the cloth feeding shaft, the cloth feeding shaft is movably connected with the cloth feeding tooth rack, and the cloth feeding tooth is fixed on the cloth feeding tooth rack. In fact, the proposal utilizes the cloth feeding shaft driving source to drive the swing rod to replace a cloth feeding connecting rod of the original sewing machine, carries out the stitch length adjustment on the stitch length adjusting mechanism and positions the zero point position of the cloth feeding teeth on the zero position positioning mechanism, and achieves the positive stitch length adjusting technical effect. However, the movement of the feed lifting connecting rod still remains in the prior art, so that the cloth feeding action of the feed dog cannot reach the intelligent control level.

In addition, a bevel gear vertical shaft and a lower shaft are also fixed on the main shaft motor and connected with the output main shaft, so that the rotating shuttle runs under the driving of the main shaft motor, and the vertical shaft and the bevel gear connected with the vertical shaft increase the manufacturing cost of the sewing machine.

Disclosure of Invention

Aiming at the defects that the structure of the sewing machine is complex, the intelligent control level is not high, the manufacturing cost is high and the like, the application provides the sewing machine which is provided with a feed dog mechanism, wherein the feed dog mechanism is driven by a feed motor and a feed dog motor.

Preferably, the feed dog motor drives the feed dog shaft to indirectly drive the feed dog to repeatedly swing in a repeated swinging and returning mode, a feed dog crank is fixed on a feed dog front output shaft connected with the feed dog motor, the feed dog crank is hinged with a feed dog first connecting rod, the feed dog first connecting rod is hinged with a feed dog second connecting rod and a feed dog third connecting rod, a feed dog rear cam is hinged with a feed dog third connecting rod, the feed dog rear cam is fixed on the feed dog shaft, the feed dog shaft is connected with a feed dog front cam, the feed dog front cam is mechanically matched with the feed dog frame, and the feed dog frame is fixed with the feed dog.

Preferably, the cloth feeding motor drives the cloth feeding shaft in a repeated swinging manner, a cloth feeding crank I is fixed on a cloth feeding output shaft connected with the cloth feeding motor, the cloth feeding crank I is hinged with a cloth feeding connecting rod, the cloth feeding connecting rod is hinged with a cloth feeding crank II, the cloth feeding crank II is fixed on the cloth feeding shaft, a cloth feeding tooth seat is fixedly connected on the cloth feeding shaft, a cloth feeding tooth frame is connected and configured on the cloth feeding tooth seat, and a cloth feeding tooth is fixed on the cloth feeding tooth frame.

Preferably, the first connecting rod of the lifting tooth is hinged with a hinged end of the second connecting rod of the lifting tooth, the hinged end is hinged with the third connecting rod of the lifting tooth, and the central position of the hinged end is concentric with the front output shaft of the lifting tooth.

Preferably, the feed dog front cam is provided with a movable rod, the movable rod is positioned on one side of the eccentric position of the feed dog front cam, and the movable rod is matched in a socket of the feed dog frame.

Preferably, the connecting part is arranged on one side of the eccentric position of the cam, the third connecting rod of the lifting tooth is hinged with the connecting part of the cam, the fixed end of the second connecting rod of the lifting tooth is connected with the supporting shaft, the fixed end of the second connecting rod of the lifting tooth is movably connected with the supporting shaft, and the other end of the supporting shaft is fixed on a supporting shaft bracket of the sewing machine.

Preferably, the cloth feeding motor and the feed lifting motor are fixedly arranged below a base plate of the sewing machine, the cloth feeding motor and the feed lifting motor are fixedly arranged on two sides of the base plate, and the cloth feeding motor and the feed lifting motor are stepping motors.

Preferably, the sewing machine is further provided with a rotating shuttle mechanism, the rotating shuttle mechanism comprises a rotating shuttle motor, a lower shaft and a shuttle peg, the rotating shuttle motor of the rotating shuttle mechanism drives the rotating shuttle to carry out thread outgoing work, the rotating shuttle motor is arranged below a base plate of the sewing machine, and the rotating shuttle motor is positioned between the cloth feeding motor and the tooth lifting motor.

Preferably, the cloth cutting machine is further provided with a thread cutting and presser foot lifting mechanism, and the thread cutting action and/or the presser foot lifting action of the thread cutting and presser foot lifting mechanism are executed by the cloth feeding motor/or the tooth lifting motor when the cloth feeding motor/the tooth lifting motor enters the idle zone.

Preferably, the thread cutting and presser foot lifting mechanism is provided with a tooth lifting motor, a thread cutting crank and a thread cutting fork wheel, the tooth lifting motor is connected with a front output shaft of the tooth lifting, the thread cutting crank is provided with a pushing piece, the pushing piece is arranged at the tail end eccentric position of the thread cutting crank, the thread cutting fork wheel is provided with a thread cutting return rod and a thread cutting push rod, the pushing piece is arranged between the thread cutting return rod and the thread cutting push rod, the thread cutting and presser foot lifting mechanism is further provided with a tooth lifting motor, a presser foot lifting cam, a presser foot lifting ejector rod, a presser foot lifting lever and a presser foot ejector rod, the tooth lifting motor is connected with a rear output shaft of the tooth lifting, the presser foot lifting cam is fixed below a base plate of the sewing machine, and two ends of the presser foot lifting lever are located below the presser foot cam and the presser foot lifting ejector rod.

Compared with the prior art, the cloth feeding motor and the tooth lifting motor are utilized to drive the cloth feeding tooth mechanism in the cloth feeding tooth driving area so as to achieve the cloth feeding function of the cloth feeding tooth, the cloth feeding motor/or the tooth lifting motor enters the idle area to indirectly push the cloth feeding tooth driving the cloth feeding tooth mechanism, and in the situation, the cloth feeding motor/the tooth lifting motor is utilized to perform a thread cutting action/or a presser foot lifting action. The sewing machine breaks through the traditional technical scheme, cancels the traditional cloth feeding connecting rod, the feed lifting tooth connecting rod and the transmission cam on the main shaft, and can shorten the manufacture of the feed lifting tooth shaft so as to reduce the manufacture cost; under the vertical axis that has cancelled original sewing machine for sewing machine reduce cost improves the intelligent control level to the gauge needle on making, thereby has improved sewing machine and has made up the quality, and the sewing machine technique of this application has higher using value widely.

Drawings

FIG. 1 is a schematic view showing a structure of a sewing machine;

FIG. 2 is a schematic view showing a feed dog mechanism and a rotating shuttle mechanism of a sewing machine;

FIG. 3 is a schematic view showing an upper and lower cloth feeding assembly and a front and rear cloth feeding assembly of a sewing machine;

FIG. 4 is a schematic view showing an upper and lower cloth feeding assembly of a sewing machine;

FIG. 5 is a view showing a connecting rod of the upper and lower cloth feeding assemblies of the sewing machine;

FIG. 6 is a schematic view showing the connection of feed dog frames of the upper and lower feed assemblies of the sewing machine;

FIG. 7 is a schematic view showing a front and rear cloth feeding assembly of the sewing machine;

FIG. 8 is a view showing a structure of a thread trimming and presser foot lifting mechanism of the sewing machine;

FIG. 9 is a schematic view of a thread cutting crank and fork wheel of the sewing machine;

FIG. 10 is a schematic view of a feed dog mechanism driven by a feed motor according to an embodiment of the sewing machine;

FIG. 11 is a schematic view showing a second embodiment of a sewing machine, wherein a cloth feeding motor drives a thread cutting and presser foot lifting mechanism.

The reference numbers are as follows: a base plate 11, a support shaft bracket 12, a feed dog front output shaft support frame 13, a feed motor 21, a feed output shaft 211, a feed shaft 22, a feed crank I23, a feed link 24, a feed crank II 25, a feed dog seat 26, a feed dog frame 27, a socket 271, a feed dog 28, a needle plate upper plane 29, a feed dog motor 31, a feed dog front output shaft 311, a feed dog rear output shaft 312, a feed dog shaft 32, a feed dog crank 33, a feed dog first link 34, a feed dog second link 35, a hinged end 351, a fixed end 352, a feed dog third link 36, a feed dog rear cam 37, a connecting part 371, a feed dog front push cam 38, a movable rod 381, a support shaft 39, a rotary shuttle motor 41, a lower shaft 42, a bobbin 43, a thread cutting crank 51, a pushing part 511, a thread cutting fork wheel 52, a thread cutting return lever 521, a thread cutting lever 522, a pushing link 523, a fixed shaft 53, a feed dog presser foot 54, an idle rotation shaft 541, a presser foot surface 542, a pressure foot lifting lever 55 and a pressure foot lifting rod 56.

Detailed Description

Preferred embodiments of the present application will be described in detail below with reference to fig. 1 to 11 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 to be construed as limiting the present invention.

Example one

The utility model provides a sewing machine has feed dog mechanism, rotating shuttle mechanism, trimming and lifts presser foot mechanism and control system etc. this application aims at releasing the sewing machine that has the lubricated mechanical transmission of efficient exempting from, and this sewing machine still has other all functions of making up that can realize normally making up work except having foretell mechanism and system, can realize normally making up. The feed dog mechanism is a feed dog 28 driven under the control of a control system, and a transmission part and a power device for driving the feed dog 28 to operate, the sewing machine of the application is controlled by the control system to drive the feed dog 28 to carry out feed work by a feed motor 21 and a feed lifting motor 31 of the feed dog mechanism, simultaneously, a rotating shuttle motor 41 of a rotating shuttle mechanism is adopted to drive a rotating shuttle to carry out thread outgoing work, and after the sewing work is finished, the feed dog motor 31 of the feed dog mechanism carries out thread cutting and presser foot lifting actions of the thread cutting and presser foot lifting mechanism.

The feed dog mechanism includes the feed motor 21, the feed dog motor 31, the feed dog 28, and components for indirectly driving the feed dog 28 by the auxiliary feed motor 21 and the feed dog motor 31, which are main components of the feed dog 28 having the function of a feed operation unit. The cloth feeding motor 21 and the feed lifting motor 31 are installed and fixed under the base plate 11 of the sewing machine, the cloth feeding motor 21 and the feed lifting motor 31 are fixed on two sides of the base plate 11, the cloth feeding motor 21 and the feed lifting motor 31 are in electric signal connection with a control system of the sewing machine, and the cloth feeding motor 21 and the feed lifting motor 31 are preferably stepping motors.

The operation corners of the feed motor 21 and the feed lifting motor 31 are composed of a feed lifting area and an idle area, the feed lifting area is used for driving the feed mechanism by the feed motor 21 and the feed lifting motor 31, the idle area is used for avoiding the power output by the feed lifting motor 31 from acting on the feed mechanism, namely, the feed lifting motor 31 enters the idle area and cannot indirectly push the feed lifting teeth 28 through various parts. Under the control of a control system of the sewing machine, the cloth feeding motor 21 and the feed lifting tooth motor 31 start to drive the feed swinging source for the cloth feeding tooth 28 at the same time in a feed feeding tooth driving area, the swinging source is indirectly transmitted to the cloth feeding tooth 28 through a plurality of parts such as the cloth feeding shaft 22 and the feed lifting tooth shaft 32 by the repeated swinging back and forth mode, the cloth feeding motor 21 and the feed lifting tooth motor 31 stop driving at the same time in the feed feeding tooth driving area after the driving work is finished, and the cloth feeding motor 21 and the feed lifting tooth motor 31 work coordinately under the control of the control system, so that the feed feeding tooth 28 has complete sewing cloth feeding action, and the normal sewing work of the sewing machine is realized.

The feed dog mechanism comprises an upper feed assembly, a lower feed assembly, a front feed assembly and a rear feed assembly. The upper and lower feed assembly comprises a feed lifting motor 31, a feed lifting shaft 32, a feed lifting crank 33, a first feed lifting link 34, a second feed lifting link 35, a third feed lifting link 36, a rear feed lifting cam 37, a front feed lifting cam 38, a feed lifting feed base 26, a feed lifting feed rack 27, a feed lifting feed 28 and the like. In summary, the feed dog motor 31 drives the feed dog shaft 32 to indirectly drive the feed dog 28 to repeatedly swing in a repeated swinging manner, so that the feed dog 28 has a cloth feeding action up and down. The power output shaft connected with the feed lifting motor 31 is a feed lifting front output shaft 311. The feed lifting rock crank 33 is fixed on the feed lifting rock front output shaft 311, the other end of the feed lifting rock crank 33 is hinged with the feed lifting rock first connecting rod 34, the other end of the feed lifting rock first connecting rod 34 is hinged with a hinged end 351 of the feed lifting rock second connecting rod 35, a fixed end 352 of the feed lifting rock second connecting rod 35 is connected with the support shaft 39, the fixed end 352 of the feed lifting rock second connecting rod 35 is movably connected on the support shaft 39 so that the feed lifting rock second connecting rod 35 can swing, and the other end of the support shaft 39 is fixed on the support shaft bracket 12 of the sewing machine. The hinged end 351 of the second connecting rod 35 is also hinged with a third connecting rod 36 of the lifting tooth, so that the first connecting rod 34 of the lifting tooth, the third connecting rod 36 of the lifting tooth and the second connecting rod 35 are hinged together. The other end of the third link 36 is hinged to a connection portion 371 of the rear cam 37, and the connection portion 371 is located on the eccentric position side of the rear cam 37. The feed lifting motor 31 drives the feed lifting crank 33 on the feed lifting front output shaft 311 in a repeated back-and-forth swinging mode, the feed lifting crank 33 drives the feed lifting first connecting rod 34, the feed lifting second connecting rod 35 and the feed lifting third connecting rod 36 to swing back and forth, and the feed lifting rear cam 37 is also driven to swing at the same angle, wherein the feed lifting second connecting rod 35 plays a role of assisting the feed lifting first connecting rod 34 and the feed lifting third connecting rod 36 to swing repeatedly.

The tooth lifting rear cam 37 is fixed on one side of the tooth lifting shaft 32 close to the tooth lifting motor 31; a feed dog front cam 38 is connected to the feed dog shaft 32 on the side of the feed dog shaft 32 close to the feed dog 28, and the feed dog frame 27 is mechanically engaged with the feed dog front cam 38. The feed lifting teeth front cam 38 is provided with a movable rod 381, the movable rod 381 is located on one side of the eccentric position of the feed lifting teeth front cam 38, and the movable rod 381 can repeatedly swing axially under the repeated swing of the feed lifting teeth shaft 32. The movable rod 381 fits within a socket 271 provided in the feed dog 27. When the cam 38 is repeatedly swung before the feed lifting teeth, the movable rod 381 is repeatedly moved in the socket 271 so that the feed dog holder 27 fixed to the feed dog seat 26 moves up and down on the socket 271 side, and the feed dog 28 is fixed to the feed dog holder 27 so that the feed dog 28 fixed to the feed dog holder 27 moves up and down.

Further, since the center position of the hinge end 351 is concentrically arranged with respect to the feed dog front output shaft 311, the feed dog motor 31 needs to leave the feed dog driving area and enter the idle rotation area after the feed dog motor 31 stops transmitting the vertical feed motion power to the feed dog 28. When the feed dog motor 31 rotates the feed dog crank 33, the feed dog first connecting rod 34 acts on the feed dog second connecting rod 35, so that the center position of the hinged end 351 of the feed dog second connecting rod 35 and the feed dog front output shaft 311 are in a concentric position state, in this case, the feed dog motor 31 continues to rotate the feed dog crank 33, the feed dog second connecting rod 35 and the feed dog third connecting rod 36 are not pushed, the feed dog motor 31 of the up-and-down feed assembly enters an idle zone of the feed dog motor 31 from a working zone of the feed dog 28 of the feed dog mechanism, and the pushing influence of the power of the feed dog motor 31 on the up-and-down feed assembly is effectively avoided. The tooth lifting motor 31 can utilize the idle rotation area, and the tooth lifting front output shaft 311 and the tooth lifting rear output shaft 312 connected with the tooth lifting motor 31 in the idle rotation area can execute the thread cutting action and the foot lifting action of the thread cutting and foot lifting mechanism.

The front and rear cloth feeding assemblies include a cloth feeding motor 21, a cloth feeding shaft 22, a cloth feeding crank I23, a cloth feeding connecting rod 24, a cloth feeding crank II 25, a cloth feeding gripper seat 26, a cloth feeding gripper 27, a cloth feeding gripper 28 and the like. In this embodiment, the feed motor 21 drives the feed shaft 22 in a reciprocating manner, and indirectly causes the feed dog 28 to repeatedly swing via the feed shaft 22, thereby providing a forward and backward feed operation. Specifically, the output end connected with the cloth feeding motor 21 is a cloth feeding output shaft 211, a cloth feeding crank I23 is fixed on the cloth feeding output shaft 211, the other end of the cloth feeding crank I23 is hinged with a cloth feeding connecting rod 24, the other end of the cloth feeding connecting rod 24 is hinged with a cloth feeding crank II 25, and the cloth feeding crank II 25 is fixed on the cloth feeding shaft 22 and is close to one side of the cloth feeding motor 21. On the side of the front end of the feed shaft 22 close to the feed dog 28, a feed dog seat 26 is connected and fixed to the feed shaft 22, a feed dog holder 27 is connected and arranged to the feed dog seat 26, and a feed dog 28 is fixed to the feed dog holder 27, so that the feed dog 28 has a back-and-forth repeated movement, and the feed dog 28 fixed to the feed dog holder 27 has a back-and-forth repeated feed movement. Here, the feed dog 28 is indirectly provided with the repeated forward and backward feed operation mainly by the feed crank one 23, the feed link 24, and the feed crank two 25 by the repeated swinging back and forth drive of the feed motor 21.

The feed dog 28 is driven by the feed dog motor 31 to perform the up-and-down feeding operation in combination with the feed dog 28 being driven by the feed dog motor 21 to perform the forward-and-backward feeding operation, so that the feed dog 28 integrating the up-and-down feeding operation and the forward-and-backward feeding operation has the complete feeding function of the sewing operation of the sewing machine, and normal sewing can be performed. The sewing machine breaks through the technical scheme that the traditional cloth feeding tooth is driven by a main shaft motor, and cancels a cloth feeding connecting rod, a tooth lifting connecting rod, a transmission cam and a linkage gear set on a main shaft of the original sewing machine, so that the sewing machine is stable and simple in structure. In addition, the feed dog shaft 22 and the feed dog shaft 32 can be made shorter to reduce manufacturing costs. Meanwhile, after a swing seat which is a traditional needle pitch adjusting important part of the original sewing machine is cancelled, the needle pitch required by the sewing of the cloth feeding teeth 28 is controlled and adjusted by the control system, the intelligent level of the sewing is further improved, and the sewing machine of the application completely has all functions of the swing seat although the swing seat is cancelled. The repeated swinging back and forth operation mode of the cloth feeding motor 21 and the feed lifting tooth motor 31 is preset by the control system, so that the cloth feeding action of the cloth feeding tooth 28 is always in a constant stitch length for sewing, namely, the stitch lengths of the cloth feeding and the feed lifting tooth are in a constant state, the condition that the front and back sizes of the stitch length of the existing sewing machine are deviated is overcome, the sewing quality and the sewing stability are effectively improved, the sewing machine has the advantage that one machine has a plurality of adjustable stitch lengths, namely, the stitch length of the sewing machine can be adjusted at will in a stop state. In addition, the cloth feeding motor 21 and the feed lifting tooth motor 31 start to drive and stop driving simultaneously under the control of the control system, so that the purpose of coordinated cloth feeding action of the feed lifting tooth mechanism is achieved, the phenomenon that the feed lifting tooth 28 only has feed lifting tooth action or only has feed lifting tooth action but not has uncoordinated sewing action of transferring the feed lifting action is avoided, and the working stability of the sewing machine is improved.

The sewing machine of the present application also has a zero gauge positioning function, i.e., a function of positioning the feed dog 28 below the upper flat surface 29 of the needle plate. The feed dog motor 31 drives the feed dog front output shaft 311 to be fixed with the feed dog crank 33, and the feed dog 28 is indirectly positioned below the upper plane 29 of the needle plate through each part by the feed dog crank 33, so that the adverse effect that the cloth is hooked by the existing sewing machine due to the fact that the feed dog 28 is positioned above the upper plane 29 of the needle plate at a high position is overcome, sewing work is smoothly carried out, and sewing quality is improved.

The rotating shuttle mechanism of the present application includes a rotating shuttle motor 41, a lower shaft 42, a bobbin 43, and the like. The rotary shuttle motor 41 is installed below the base plate 11 of the sewing machine and between the cloth feeding motor 21 and the feed lifting motor 31. The rotating shuttle motor 41 is connected with the lower shaft 42 and drives the shuttle peg 43 under the control of the control system to complete the rotating shuttle outgoing work of the rotating shuttle mechanism, and the rotating shuttle outgoing work of the rotating shuttle mechanism and the cloth feeding tooth cloth feeding work of the cloth feeding tooth mechanism are carried out synchronously, which is not different from the prior art. The lower shaft 42 is directly driven by the rotating shuttle motor 41 to execute the rotating shuttle thread-out work of the bobbin 43, the vertical shaft and the transmission gear of the original sewing machine are eliminated, the length of the lower shaft is shortened, and the manufacturing cost of the sewing machine is reduced in production. In addition, the rotating shuttle motor 41 adopts a stepping motor, which is beneficial to the control system to control the rotating shuttle to be in line outgoing work, thereby improving the intelligent control level of the sewing machine and improving the sewing quality.

After the feed lifting motor 31 enters the idle rotation area, the feed lifting front output shaft 311 and the feed lifting rear output shaft 312 of the feed lifting motor 31 of the present application do not have parts of a thread cutting and presser foot lifting mechanism, and at this time, the thread cutting and presser foot lifting mechanism of the sewing machine performs a thread cutting action and a presser foot lifting action by a traditional electromagnet.

In addition, the thread trimming and presser foot lifting mechanism is also provided with the following scenes. In the thread cutting presser foot lifting mechanism, a thread cutting crank 51 is mounted on a front feed shaft 311 of a feed lifting tooth connected with a feed lifting tooth motor 31, the thread cutting crank 51 is fixed between the feed lifting tooth motor 31 and a feed lifting tooth crank 33, a feed lifting tooth front feed shaft support frame 13 of a sewing machine is further arranged between the thread cutting crank 51 and the feed lifting tooth crank 33, a bearing is arranged between the feed lifting tooth front feed shaft support frame 13 and the feed lifting tooth front feed shaft 311, and the feed lifting tooth front feed shaft support frame 13 is arranged to ensure that the feed lifting tooth motor 31 has a fixed and reliable structure during operation. A lifting pin cam 54 is fixed on a lifting pin rear output shaft 312 connected with the lifting pin motor 31.

Here, in addition to the above-mentioned thread trimming crank 51 mounted on the front output shaft 311 of the tooth raising motor 31 connected to the tooth raising motor and the presser foot lifting cam 54 mounted on the rear output shaft 312 of the tooth raising motor, it should be noted that, in the thread trimming presser foot mechanism, the thread trimming crank 51 and the presser foot lifting cam 54 may not be mounted on the front output shaft 311 of the tooth raising motor 31 connected to the output shaft 312 of the tooth raising motor, and the thread trimming and presser foot lifting actions are performed by the conventional electromagnet of the sewing machine, or alternatively, the thread trimming crank 51 may be mounted on the front output shaft 311 of the tooth raising motor 31 connected to the tooth raising motor and the presser foot lifting cam 54 may not be mounted on the rear output shaft 312 of the tooth raising motor 31, and the thread trimming crank 51 may not be mounted on the front output shaft 311 of the tooth raising motor 31, and the thread trimming actions may be performed by the electromagnet, in short, the thread cutting and presser foot lifting operation of the thread cutting presser foot lifting mechanism is achieved in various ways.

The thread cutting presser foot lifting mechanism is provided with a feed lifting motor 31, a thread cutting crank 51 and a thread cutting fork wheel 52, wherein the feed lifting front output shaft 311 connected with the feed lifting motor 31 is provided with the thread cutting crank 51, the thread cutting crank 51 is provided with a pushing piece 511, and the pushing piece 511 is arranged at the tail end eccentric position of the thread cutting crank 51. The pushing piece 511 pushes the thread cutting fork wheel 52 to realize the thread cutting action: the thread cutting fork wheel 52 is provided with a thread cutting return rod 521 and a thread cutting push rod 522, the pushing piece 511 is arranged between the thread cutting return rod 521 and the thread cutting push rod 522, and the pushing piece 511 is arranged between the thread cutting return rod 521 and the thread cutting push rod 522 and is used for preventing power from being transmitted to the thread cutting return rod 521 or the thread cutting push rod 522 when the feed dog mechanism is driven by the feed dog motor 31. When the feed motor 31 drives the thread trimming crank 51 of the feed front output shaft 311, the pushing member 511 pushes the thread trimming pushing rod 522 and pushes the pushing link 523, so that the rear thread trimming executing end performs thread trimming. The thread cutting fork wheel 52 is positioned by the fixed shaft 53, so that the thread cutting action of the thread cutting fork wheel 52 has a stable rotating structure, and the fixed shaft 53 is fixedly connected with the support frame 13 of the front output shaft of the lifting tooth of the sewing machine.

In addition, the thread cutting operation and the presser foot lifting operation of the present application are performed in an idle zone, the thread cutting operation can be performed under the upper plane 29 of the needle plate by selecting the feed dog 28 so that the cut residual thread is as short as possible, and the control system selects the timing to perform in the idle zone state, and similarly, the presser foot lifting operation is performed in the idle zone state so that the presser foot lifting operation is more in line with the sewing flow and timing. In contrast, the thread cutting action and the presser foot lifting action are selected by the control system to have the optimal time to the maximum extent, and the requirement of sewing on the sewing machine is improved.

After the thread cutting action is finished, the control system of the sewing machine immediately commands the tooth lifting motor 31 to execute the presser foot lifting action.

The thread trimming presser foot lifting mechanism further comprises a tooth lifting motor 31, a presser foot lifting cam 54, a presser foot lifting ejector rod 56, a presser foot lifting lever 55, a presser foot lifting ejector rod 56 and the like. A lifting pin cam 54 is fixed on a lifting pin rear output shaft 312 connected with the lifting pin motor 31. The presser foot lifting lever 55 is fixed below the base plate 11 of the sewing machine and is positioned at the rear side of the feed lifting motor 31, two ends of the presser foot lifting lever 55 are positioned below the presser foot lifting cam 54 and the presser foot lifting mandril 56, and the feed lifting motor 31 drives the presser foot lifting cam 54 to lift or lower the presser foot lifting mandril 56 through pressing or loosening the presser foot lifting mandril 56. The presser foot lifting cam 54 is actually a cam, the presser foot lifting cam 54 has an idle surface 541 and a presser foot lifting surface 542, the idle surface 541 and the presser foot lifting surface 542 can alternately act on the presser foot lifting lever 55 under the driving of the tooth lifting motor 31, and the idle surface 541 is used for avoiding power transmission to the presser foot lifting lever 55 and the presser foot lifting ejector rod 56 when the tooth lifting motor 31 drives the thread cutting crank 51 on the tooth lifting front output shaft 311.

The presser foot lifting surface 542 is a cam portion of the presser foot lifting cam 54, and the presser foot lifting cam 54 is driven by the tooth lifting motor 31 to rotate in the direction of the presser foot lifting surface 542 from the state originally in the idle rotation surface 541, so that the presser foot lifting surface 542 is gradually applied to the presser foot lifting ejector rod 56 through the presser foot lifting lever 55, and the presser foot lifting ejector rod 56 is lifted. The highest point of the cam part of the presser foot lifting surface 542 is abutted against the presser foot lifting lever 55, namely the presser foot lifting ejector rod 56 is at the highest position, and the presser foot lifting state is a lifting state, wherein the highest point of the cam part is the highest point of the cam arc surface of the presser foot lifting surface 542.

After the trimming and the presser foot lifting are completed, the feed lifting motor 31 drives the feed lifting front output shaft 311 to drive the trimming crank 51 to continue rotating, so that the pushing piece 511 acts on the trimming return rod 521 until the trimming return rod returns to the original position. At the same time, the presser foot lifting cam 54 rotates from the highest point of the presser foot lifting to the idle surface 541 within a period of time preset by the control system, and the presser foot lifting lever 55 realizes the presser foot lifting action of lowering the presser foot lifting ejector rod 56.

Example two

The feed dog mechanism of the second embodiment and the first embodiment is also completed by jointly driving the feed motor 21 and the feed lifting motor 31, and the difference is that the feed dog 28 of the feed dog mechanism generates the up-and-down feed motion and is driven by the feed motor 21; the feed dog 28 of the feed dog mechanism is driven by a feed lifting motor 31 to perform forward and backward feed operations. The structure that the feed dog 28 of the feed dog mechanism is driven by the feed dog motor 21 to generate the up-and-down feed motion is the same as that of the feed dog 28 of the feed dog mechanism driven by the feed dog motor 31 in the first embodiment; the feed dog 28 of the feed dog mechanism driven by the feed dog motor 31 to perform the back-and-forth feed operation is the same as the feed dog 28 of the feed dog mechanism driven by the feed motor 21 in the first embodiment, and specific components overlapping each other are not shown in fig. 10 to 11.

The motor operation rotating angles of the cloth feeding motor 21 and the tooth lifting motor 31 are also composed of a cloth feeding tooth driving area and an idle area, the cloth feeding motor 21 and the tooth lifting motor 31 drive a cloth feeding tooth mechanism in the cloth feeding tooth driving area, and the tooth lifting motor 31 carries out the thread cutting action and the presser foot lifting action of the thread cutting presser foot mechanism by utilizing the idle area. The cloth feeding motor 21 enters the idle zone and indirectly pushes and drives the cloth feeding teeth 28 of the cloth feeding teeth mechanism by using various parts, and the front output shaft and the rear output shaft which are connected with the cloth feeding motor 21 in the idle zone perform the thread cutting action and the presser foot lifting action of the thread cutting presser foot mechanism.

Of course, the front output shaft connected with the cloth feeding motor 21 is provided with the thread cutting crank 51, the rear output shaft is not provided with the thread lifting and pressing cam 54, the thread lifting and pressing is performed by a traditional electromagnet, or the rear output shaft connected with the cloth feeding motor 21 is provided with the thread lifting and pressing cam 54, but the front output shaft is not provided with the thread cutting crank 51, the thread cutting action is performed by an electromagnet, or the rear output shaft connected with the cloth feeding motor 21 is not provided with the thread lifting and pressing cam 54 and the thread cutting crank 51, or the front output shaft connected with the cloth feeding motor 21 is not provided with the thread cutting crank 51, the rear output shaft is not provided with the thread lifting and pressing cam 54, and the cloth feeding motor 21 does not perform the thread cutting and pressing actions.

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 mechanism, wherein the feed dog mechanism is driven by a feed motor and a feed lifting motor, and is characterized in that the feed motor and the feed lifting motor drive the feed dog mechanism in a feed dog driving area, and the feed motor/or the feed lifting motor enters an idle area to indirectly push the feed dog driving the feed dog mechanism.

2. The sewing machine of claim 1, wherein the feed dog shaft is driven by the feed dog motor to indirectly drive the feed dog to repeatedly swing in a repeated swinging manner, a feed dog crank is fixed on a feed dog front output shaft connected with the feed dog motor, the feed dog crank is hinged with a feed dog first connecting rod, the feed dog first connecting rod is hinged with a feed dog second connecting rod and a feed dog third connecting rod, the feed dog third connecting rod is hinged with a feed dog rear cam, the feed dog rear cam is fixed on the feed dog shaft, a feed dog front cam is connected on the feed dog shaft, the feed dog front cam is mechanically matched with the feed dog frame, and the feed dog frame is fixed with the feed dog.

3. The sewing machine of claim 1, wherein the feed motor drives the feed shaft in a reciprocating manner, a first feed crank is fixed to a feed output shaft connected to the feed motor, the first feed crank is hinged to a feed link, the feed link is hinged to a second feed crank, the second feed crank is fixed to the feed shaft, a feed dog seat is connected to the feed shaft, a feed dog frame is connected to the feed dog seat, and feed dogs are fixed to the feed dog frame.

4. The sewing machine of claim 2, wherein the first link of the feed dog is hinged to a second link of the feed dog and has a hinged end hinged to a third link of the feed dog, the hinged end being centered on the front output shaft of the feed dog.

5. The sewing machine of claim 2, wherein the feed dog front cam has a movable bar located on the eccentric position side of the feed dog front cam, the movable bar fitting in a socket provided in the feed dog carrier.

6. The sewing machine of claim 2, wherein the cam has a connecting portion located on the eccentric position side of the cam, the third link of the cam is hinged to the connecting portion of the cam, the second link of the cam has a fixed end connected to the support shaft, the fixed end of the second link of the cam is pivotally connected to the support shaft, and the other end of the support shaft is fixed to a support shaft bracket provided in the sewing machine.

7. The sewing machine of claim 1, 2 or 3, wherein the feed motor and the feed lifting motor are mounted and fixed under a base plate of the sewing machine, the feed motor and the feed lifting motor are fixed on both sides of the base plate, and the feed motor and the feed lifting motor are stepping motors.

8. The sewing machine of claim 1, further comprising a rotating shuttle mechanism, wherein the rotating shuttle mechanism comprises a rotating shuttle motor, a lower shaft and a bobbin, the rotating shuttle motor of the rotating shuttle mechanism drives the rotating shuttle to perform thread-outgoing operation, the rotating shuttle motor is arranged below a base plate of the sewing machine, and the rotating shuttle motor is arranged between the cloth feeding motor and the tooth lifting motor.

9. The sewing machine of claim 1, further comprising a thread cutting and presser foot lifting mechanism, wherein the feed motor and/or the feed motor is driven to enter the idle zone, and the thread cutting and presser foot lifting action of the thread cutting and presser foot lifting mechanism is performed by the feed motor and/or the feed motor.

10. The sewing machine of claim 9, wherein the thread-cutting presser-foot lifting mechanism comprises a thread-lifting motor, a thread-cutting crank and a thread-cutting fork wheel, the thread-cutting crank is mounted on a front output shaft of the thread-lifting motor, the thread-cutting crank comprises a pushing member, the pushing member is arranged at an eccentric position at the tail end of the thread-cutting crank, the thread-cutting fork wheel comprises a thread-cutting return rod and a thread-cutting push rod, the pushing member is arranged between the thread-cutting return rod and the thread-cutting push rod, the thread-cutting presser-foot lifting mechanism further comprises a thread-lifting motor, a presser-foot lifting cam, a presser-foot lifting push rod, a presser-foot lifting lever and a presser-foot lifting push rod, the presser-foot lifting cam is fixed on a rear output shaft of the thread-lifting motor, the presser-foot lever is fixed under a base plate of the sewing machine, and two ends of the presser-foot lifting lever are positioned under the presser-foot lifting cam and the presser-foot push rod.

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