CN112779689A

CN112779689A - Sewing machine with function of avoiding multiple needle-walking and thread-cutting at zero needle pitch

Info

Publication number: CN112779689A
Application number: CN202110131335.7A
Authority: CN
Inventors: 林子春; 林高宏; 吴文俊
Original assignee: Qixing Intelligent Technology Co Ltd
Current assignee: Qixing Intelligent Technology Co Ltd
Priority date: 2021-01-30
Filing date: 2021-01-30
Publication date: 2021-05-11

Abstract

The application provides a sewing machine with exempt from to walk a needle more and at zero gauge needle trimming, concretely relates to sewing machine makes technical field, including gauge needle adjustment mechanism and trimming mechanism, the trimming action is carried out under the gauge needle fixed before making up, its characterized in that trimming action is carried out after adjusting the gauge needle for zero gauge needle, gauge needle adjustment mechanism has gauge needle locating wheel, rotates lever and feed dog, the gauge needle locating slot that gauge needle locating wheel had promotes the slider indirect location feed dog zero gauge needle position that rotates the lever and have. The zero-gauge position of the feed dog is controlled and realized based on the sewing machine electric control system, the determination of the zero-gauge position of the feed dog is realized by the scheme, the sewing machine executes thread cutting action at the zero-gauge position of the feed dog, the technical effect that no residual thread is left by thread cutting is achieved, the technical problem that a needle hole is left at last in a sewing material stitch in the prior art is solved, and the high popularization and use value is achieved.

Description

Sewing machine with function of avoiding multiple needle-walking and thread-cutting at zero needle pitch

Technical Field

The application provides a sewing machine with exempt from to walk a stitch more and at zero gauge needle trimming, concretely relates to sewing machine makes technical field.

Background

The feed dog and the presser foot of the sewing machine are key parts in the sewing and wiring process, the feed dog provides a needle puncture threading and wiring stroke for sewing materials to be sewn, the presser foot is used for pressing the sewing materials to be sewn on the needle plate, and the feed dog and the presser foot are matched to ensure the smoothness of the sewing materials in the moving process, so that the sewing stitches are neat and attractive. When sewing is finished, a sewing machine usually performs thread cutting in an automatic thread cutting mode, and when a movable thread cutting knife and a fixed thread cutting knife are matched for thread cutting, because the cloth feeding teeth are in different conditions before and after the stop position every time when the sewing of the existing sewing machine is finished, the length of the residual thread after thread cutting is different. In addition, the existing sewing machines implement automatic thread cutting by adopting a scheme of more than one needle during thread cutting, and the two ends of the upper thread and the bottom thread are almost in the same needle hole by more than one needle during thread cutting, so that the automatic thread cutting machine can cut off the two threads, and a needle penetrating hole is left at the last of a sewing material stitch, which is a technical problem that technical personnel in the field need to overcome together. Then, the existing sewing machine executes sewing after the stitch length is adjusted, the cut thread is the cut thread with large stitch length, the residual thread cut by small stitch length is naturally shorter, and the residual thread cut by large stitch length is naturally longer. If the thread end left on the sewing material after thread cutting is long, the operator needs to trim the remaining thread again, the workload of the operator is increased, and the thread cutting quality seeks to realize the shortest possible remaining thread every time.

Disclosure of Invention

To the last problem of leaving a needle hole and trimming excess line overlength of current seam material stitch, this application provides a sewing machine with exempt from to walk a needle more and at zero gauge needle trimming, including gauge needle adjustment mechanism and trimming mechanism, the trimming action is carried out under the fixed gauge needle before making up, its characterized in that, sewing machine's gauge needle adjustment mechanism adjusts the gauge needle and carries out the trimming after being zero gauge needle.

Furthermore, the stitch length adjusting mechanism is provided with a stitch length positioning wheel, a rotating lever and a cloth feeding tooth, and after a stitch length positioning groove in the stitch length positioning wheel pushes a sliding piece in the rotating lever to indirectly position the zero stitch length position of the cloth feeding tooth, the sewing machine executes zero stitch length thread trimming action.

Furthermore, the sewing machine is also provided with a swinging seat, a connecting rod, a cloth feeding shaft and a cloth feeding crank, wherein the rotating lever is hinged with the connecting rod, the connecting rod is hinged with the swinging seat, the cloth feeding crank is fixed on the cloth feeding shaft and is hinged with the swinging seat, and the cloth feeding shaft is indirectly connected with the cloth feeding teeth.

Preferably, the needle pitch positioning wheel is provided with a first return groove and a second return groove, the first return groove or the second return groove is used for returning the sliding piece to the needle pitch positioning groove at a positive needle pitch maximum point or a negative needle pitch maximum point of the swinging seat, and the positive needle pitch maximum point and the negative needle pitch maximum point are positioned at the tail end point of the needle pitch adjusting groove.

Preferably, the gauge positioning slot has an outer circular wall and an inner circular wall, the slider sliding between the outer circular wall and the inner circular wall.

Preferably, the needle pitch positioning wheel pushing sliding piece is driven by a driving motor of the sewing machine, the needle pitch positioning wheel is mounted on an output shaft of the driving motor, and the output shaft and the circular arc of the needle pitch positioning groove are located on the same circle center.

Preferably, the needle gauge positioning wheel pushes the sliding part under the driving of the driving motor to change the action position of the needle gauge adjusting groove of the needle gauge positioning wheel, and then the original needle gauge of the swinging seat is changed by rotating the lever and the connecting rod.

Preferably, the sewing machine is also provided with a combined wheel, the combined wheel is provided with a shaft hole through which an output shaft can pass for positioning, the combined wheel is provided with three functional wheels, namely a needle gauge needle distance positioning wheel, a presser foot lifting cam and a thread trimming crank wheel, and different functional wheels of the combined wheel complete needle distance adjusting action, positioning feed dog zero needle distance position action, presser foot lifting action and thread trimming action under the driving of a driving motor in different driving corners.

Preferably, the working fulcrum of the rotating lever is a sliding part, the sliding part is located in the middle of the rotating lever, a lever supporting shaft is hinged to one end of the rotating lever, and the lever supporting shaft is located on the machine body.

The application provides a sewing machine beneficial effect who has exempt from to walk a stitch more and cut off the line at zero gauge needle is: firstly, the needle pitch positioning wheel is driven by a driving motor to push a sliding piece to change the action position of a positioning groove of the needle pitch positioning wheel, the original needle pitch of a swinging seat is changed by rotating a lever and a connecting rod, and the sewing machine realizes the execution of the needle pitch adjustment action in a shutdown state; and after sewing is finished, the driving motor drives the needle pitch positioning groove of the needle pitch positioning wheel to push the sliding piece of the rotating lever, the connecting rod is hinged with the connecting rod through the rotating lever, the connecting rod is hinged with the swinging seat, the cloth feeding crank is fixed on the cloth feeding shaft and is hinged with the swinging seat, and the cloth feeding shaft is indirectly connected with the cloth feeding teeth. The needle pitch adjustment and the zero needle pitch position positioning of the feed dog are controlled and realized based on the sewing machine electric control system, the scheme realizes that the swing seat does not provide a front-back swing source for the feed dog to determine the zero needle pitch position of the feed dog, realizes thread cutting at the zero needle pitch position of the feed dog, achieves the technical effect that no residual thread is left by thread cutting, overcomes the technical problem that a needle penetrating hole is left at the last of a sewing material stitch in the prior art, and has high popularization and use values.

Drawings

FIG. 1 is a view of a sewing machine of the present application having a stitch free and thread trimming at zero gauge;

FIG. 2 is a schematic view of a feed dog stitch length positioning wheel and stitch length adjustment of a sewing machine having a zero stitch length thread trimming without multiple stitch operations according to the present application;

FIG. 3 is a schematic view of a needle pitch adjustment and swing seat of a sewing machine of the present application having a zero stitch and zero stitch trimming operation without multiple stitch;

FIG. 4 is a schematic view of a stitch length adjustment slot of a sewing machine of the present application having a zero stitch and zero stitch cut free function;

FIG. 5 is a side view of a sewing machine combination wheel of the present application having a no-over stitch and thread trimming at zero gauge;

FIG. 6 is a schematic view of a stitch length dial bar of a sewing machine of the present application having a zero stitch length thread trimming without multiple stitch;

FIG. 7 is a thread trimming block diagram of a sewing machine of the present application having a zero stitch and thread trimming at zero stitch;

FIG. 8 is a schematic view of a presser foot lifting cam of a sewing machine of the present application having no more stitches and cutting thread at zero stitch length.

Reference numerals: the device comprises a driving motor 10, an output shaft 11, a shaft hole 12, a combination wheel 20, a needle pitch positioning wheel 21, a needle pitch adjusting groove 211, a needle pitch positioning groove 212, an outer circular wall 21b, an inner circular wall 21c, a first return groove 213, a second return groove 214, a maximum positive needle pitch point 215, a maximum negative needle pitch point 216, a presser foot lifting cam 22, a presser foot lifting action surface one 221, a presser foot lifting action surface two 222, a presser foot lifting peak 223, an idle surface 224, a trimming crank wheel 23, a rotating column 231, a swinging seat 30, a feeding swinging plate 31, a long swinging plate 33, a feeding short swinging plate 32, a rotating lever 41, a sliding part 42, a lever supporting shaft 43, a connecting rod 44, a machine body 45, a cloth feeding shaft 51, a cloth feeding crank 52, a swinging connecting rod 53, a presser foot lifting ejector rod 61, a positioning sleeve 62, a presser foot lever 63, a presser foot end lifting execution end 64, a trimming fork wheel 71, a fixed shaft 72, a trimming action surface 73, a trimming return action, a trimming connecting rod 75, a trimming long shaft 76, a main shaft motor 81 and a cloth feeding tooth 91.

Detailed Description

Preferred embodiments of the present application will be described in detail below with reference to fig. 1 to 8, 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 sewing machine with exempt from to walk a stitch more and cut off the line at zero gauge needle, sewing machine has gauge needle adjustment mechanism, trimming mechanism and driving motor 10, and gauge needle adjustment mechanism has gauge needle locating wheel 21, rotates lever 41 and feed dog 91. The output shaft 11 of the driving motor 10 is provided with a combined wheel 20, and the combined wheel 20 is used for realizing the needle pitch adjusting action, the zero needle pitch position action of the positioning feed dog, the presser foot lifting action and the thread trimming action of the sewing machine at different time periods. The four sewing actions are at each driving corner of the driving motor 10, and the wheels with different functions of the combined wheel 20 are driven by the driving motor 10 in each driving corner to complete the four sewing actions, or complete any one of the four sewing actions, or randomly combine two or more than two sewing actions.

The combination wheel 20 has three functional wheels, namely a stitch length positioning wheel 21, a pressure lifting and pressing foot cam 22 and a thread trimming crank wheel 23, the stitch length positioning wheel 21, the pressure lifting and pressing foot cam 22 and the thread trimming crank wheel 23 are integrally combined into the combination wheel 20, the three functional wheels can be independently arranged and respectively installed and fixed on the output shaft 11, and the pressure lifting and pressing foot cam 22 is positioned between the stitch length positioning wheel 21 and the thread trimming crank wheel 23 no matter the combination or the independent arrangement. The combination wheel 20 has a shaft hole 12 through which the output shaft 11 can be inserted and positioned, and the combination wheel 20 is fitted and fixed to the output shaft 11, so that the output shaft 11 is provided with the pitch positioning wheel 21.

The pitch wheel 21 has a pitch adjustment groove 211, a pitch positioning groove 212, a first return groove 213, and a second return groove 214. The two ends of the needle pitch adjusting groove 211 adjacent to the needle pitch positioning groove 212 are a first return groove 213 and a second return groove 214, respectively. The needle pitch adjusting groove 211 is correspondingly matched with the rotating lever 41, the working movable fulcrum of the rotating lever 41 is the sliding part 42, the sliding part 42 is positioned in the middle of the rotating lever 41, the sliding part 42 slides and works among the needle pitch adjusting groove 211, the needle pitch positioning groove 212, the first return groove 213 and the second return groove 214 according to sewing actions, and the first return groove 213 or the second return groove 214 is used for returning the sliding part 42 to the needle pitch positioning groove 212 at the positive needle pitch maximum point 215 or the negative needle pitch maximum point 216 of the swinging seat 30. The maximum point 215 of the positive needle pitch and the maximum point 216 of the negative needle pitch of the swing seat 30 are located at the end points of both ends of the needle pitch adjusting groove 211, and the maximum point 215 of the positive needle pitch and the maximum point 216 of the negative needle pitch are uncertain and can be interchanged due to different models of sewing machines. One end of the rotating lever 41 is sleeved on the lever supporting shaft 43, the lever supporting shaft 43 is positioned on the machine body 45, and the lever supporting shaft 43 plays a role in fixing the rotating shaft by rotating the lever 41. The other end of the rotating lever 41 is hinged with a connecting rod 44, and the other end of the connecting rod 44 is hinged with the swinging seat 30. The stitch length adjustment is to rotate the stitch length positioning wheel 21 by a certain angle by the driving motor 10 to change the action position of the sliding part 42 in the stitch length adjusting groove 211, that is, the stitch length adjusting groove 211 pushes the sliding part 42, and then the original swing angle of the swing seat 30 is changed by rotating the lever 41 and the connecting rod 44, so as to realize the stitch length adjustment. The stitch length adjustment is performed in a state where the sewing machine is stopped, and the stitch length after the adjustment is successful is given to the swing base 30 as a new fixed stitch length.

When the thread cutting is required after the sewing is finished, the sliding member 42 is separated from the stitch length adjusting groove 211 and passes through the first return groove 213 or the second return groove 214 to enter the stitch length positioning groove 212 under the condition that the driving motor 10 drives the stitch length positioning wheel 21. The needle pitch positioning groove 212 has an outer circular wall 21b and an inner circular wall 21c, the sliding member 42 slides between the outer circular wall 21b and the inner circular wall 21c, when the sliding member 42 enters the needle pitch positioning groove 212, the new needle pitch is indirectly determined to be the zero needle pitch, and the sewing machine can perform thread cutting under the zero needle pitch, so that the technical effect of almost no residual thread is realized. When the needle pitch positioning wheel 21 rotates, the sliding member 42 enters the needle pitch positioning groove 212 from the needle pitch adjusting groove 211, the sliding member 42 together with the rotating lever 41 pushes the feeding swing plate 31 of the swing base 30 through the connecting rod 44, so that the feeding long swing plate 33 and the feeding short swing plate 32 of the swing base 30 are pushed to a flush state, the feeding long swing plate 33 and the feeding short swing plate 32 in the flush state are driven by the spindle motor 81, and the swing connecting rod 53 acts on the swing base 30 to make the swing angle zero, that is, the needle pitch is zero. The feed crank 52 is fixed to the feed shaft 51 and hinged to the swing base 30, the feed shaft 51 is indirectly connected to the feed dog 91, and the feed crank 52 connecting the swing base 30 and the feed shaft 51 does not swing when the swing angle of the swing base 30 is zero, and at this time, the swing base 30 does not provide a swing source for the forward and backward movement of the feed dog 91, so that the feed shaft 51 does not swing, and the feed dog 91 does not perform the forward and backward feed movement. The method has the advantages that the zero needle pitch of the feed dog 91 of the sewing machine is determined, the thread cutting action is immediately executed after the zero needle pitch of the feed dog 91 of the sewing machine is determined, and the technical effect that no excess thread is achieved when the sewing machine cuts threads in a zero needle pitch state is achieved.

The thread cutting operation is performed after the slider 42 enters the pitch positioning groove 212 from the first return groove 213 or the second return groove 214 and pushes the pitch positioning groove 212, that is, the presser foot lifting operation is performed at the zero-pitch position of the feed dog 91, and the presser foot lifting operation is performed after the thread cutting operation is completed.

When the sliding member 42 in the needle pitch positioning wheel 21 starts to enter the needle pitch positioning groove 212 and pushes the connecting rod 44 to indirectly make the feeding long swinging plate 33 and the feeding short swinging plate 32 flush, the rotating column 231 of the thread cutting crank wheel 23 applies a pushing force to the thread cutting acting surface 73 of the thread cutting fork wheel 71 in the thread cutting corner of the driving motor 10, and then the thread cutting acting surface 73 pushes the thread cutting long shaft 76 and the thread cutting action is executed by the last thread cutting executing end. The thread cutting long shaft 76 is hinged to the thread cutting connecting rod 75 through a passage and penetrates through the whole machine body 45 at the end thread cutting executing end, namely, the thread cutting connecting rod 75 drives the thread cutting long shaft 76 from the thread cutting connecting rod 75 to the end thread cutting executing end 77.

The thread cutting fork wheel 71 is positioned on the fixed shaft 72 by using the fixed shaft 72 as a rotating shaft, and a thread cutting action surface 73 and a thread cutting return action surface 74 of the thread cutting fork wheel 71 are pushed by the rotating column 231 to rotate along with the fixed shaft 72. The thread cutting action surface 73 is hinged to the thread cutting connecting rod 75, the thread cutting action surface 73 is stressed to push the thread cutting connecting rod 75 to press downwards, the thread cutting connecting rod 75 pushes the thread cutting end execution end 76 to execute thread cutting action, and thread cutting of the cloth feeding teeth 91 at the zero-stitch-length position is achieved.

The rotating column 231 is located between the trimming acting surface 73 and the trimming returning acting surface 74, the rotating column 231 is located in the idle stroke between the trimming acting surface 73 and the trimming returning acting surface 74, and the needle pitch positioning wheel 21 is driven by the spindle motor 81 through the swinging connecting rod 53 to idle in the idle stroke during normal sewing, so that the driving motor 10 cannot generate actual action on trimming during normal sewing of the sewing machine of the application, and the rotating column 231 cannot touch the trimming acting surface 73 and the trimming returning acting surface 74 during other actions. The thread cutting return action surface 74 is used for returning the thread cutting fork wheel 71 to the original position of thread cutting after thread cutting, when the rotating column 231 presses the thread cutting action surface 73, that is, the rotating column 231 rotates for one circle, not only thread cutting is performed, but also the integral return of the thread cutting fork wheel 71 is completed.

When the sliding member 42 inside the stitch length positioning wheel 21 enters the stitch length positioning groove 212 to complete the thread trimming operation, the sewing machine immediately performs the presser foot lifting operation. The presser foot lifting cam 22 has a first presser foot lifting action surface 221, a second presser foot lifting action surface 222 and an idle surface 224, and a presser foot lifting peak 223 is formed between the first presser foot lifting action surface 221 and the second presser foot lifting action surface 222. During thread trimming, the presser foot lifting push rod 61 abuts against the idle surface 224 of the presser foot lifting cam 22, so that the sewing machine normal sewing and thread trimming operation driving motor 10 does not have an actual operation effect on the presser foot lifting.

The drive motor 10 performs a presser foot raising operation within the presser foot raising corner. The driving motor 10 drives the presser foot lifting cam 22 to lift the presser foot lifting ejector rod 61, and the sliding part 42 can enter and push the needle distance positioning groove 212 from the first return groove 213 or the second return groove 214, so that the presser foot lifting action of the application under the zero needle distance position state of the feed dog 91 is realized. The first presser action surface 221 or the second presser action surface 222 of the presser cam 22 can reach the presser peak 223 for the presser lift ram 61, and the presser lift ram 61 can return to the starting position from the first return groove 213 or the second return groove 214. The presser foot lifting ejector rod 61 is sleeved in the positioning sleeve 62, the presser foot lifting ejector rod 61 is hinged with the presser foot lifting lever 63, the presser foot lifting lever 63 is connected with the presser foot lifting end execution end 64, the presser foot lifting action is executed by the presser foot lifting end execution end 64, and the presser foot lifting action at the zero-gauge position of the cloth feeding teeth 91 is realized through the presser foot lifting action of the sewing machine, so that the sewing machine has high technical value.

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

1. A sewing machine capable of avoiding multiple needles to move and cutting thread at a zero needle pitch comprises a needle pitch adjusting mechanism and a thread cutting mechanism, wherein the thread cutting action is executed at a fixed needle pitch before sewing.

2. The sewing machine with no-walk needle and thread cutting at zero stitch length according to claim 1, characterized in that the stitch length adjusting mechanism has a stitch length positioning wheel (21), a rotating lever (41) and a feed dog (91), and the sewing machine performs the zero stitch length thread cutting action after a stitch length positioning slot (212) of the stitch length positioning wheel (21) pushes a sliding member (42) of the rotating lever (41) to indirectly position the feed dog (91) at the zero stitch length position.

3. The sewing machine with the function of zero-stitch-length thread trimming without multiple stitches is characterized in that the sewing machine is further provided with a swinging seat (30), a connecting rod (44), a cloth feeding shaft (51) and a cloth feeding crank (52), wherein the rotating lever (41) is hinged with the connecting rod (44), the connecting rod (44) is hinged with the swinging seat (30), the cloth feeding crank (52) is fixed on the cloth feeding shaft (51) and is hinged with the swinging seat (30), and the cloth feeding shaft (51) is indirectly connected with a cloth feeding tooth (91).

4. A machine with a stitch-free and zero-gauge thread trimming function according to claim 2, characterized in that the gauge wheel (21) has a first return groove (213) and a second return groove (214), the first return groove (213) or the second return groove (214) being used for returning the slider (42) to the gauge wheel (212) at a maximum point (215) of positive gauge or a maximum point (216) of negative gauge of the oscillating base (30), the maximum point (215) of positive gauge and the maximum point (216) of negative gauge being located at the end points of the gauge wheel (211).

5. A machine with stitch-free and thread-cutting at zero stitch length according to claim 2, characterized in that said stitch length positioning slot (212) has an outer circular wall (21b) and an inner circular wall (21c), said slider (42) sliding between the outer circular wall (21b) and the inner circular wall (21 c).

6. A sewing machine with a stitch-free and zero-gauge thread trimming function according to claim 2, characterized in that the needle gauge positioning wheel (21) pushing slider (42) is driven by a driving motor (10) of the sewing machine, the output shaft (11) of the driving motor (10) is provided with the needle gauge positioning wheel (21), and the output shaft (11) and the arc of the needle gauge positioning groove (212) are concentric.

7. The sewing machine with no more needles and cutting thread at zero needle pitch according to claim 2, characterized in that the needle pitch positioning wheel (21) is driven by the driving motor (10) to push the sliding member (42) to change the action position of the needle pitch adjusting groove (211) of the needle pitch positioning wheel (21), and then the original needle pitch of the swing seat (30) is changed by rotating the lever (41) and the connecting rod (44).

8. The sewing machine capable of cutting thread without a plurality of needles and with a zero needle pitch according to claim 2 is characterized in that the sewing machine is further provided with a combination wheel (20), the combination wheel (20) is provided with a shaft hole (12) for the output shaft (11) to pass through for positioning, the combination wheel (20) is provided with three functional wheels, namely a needle pitch positioning wheel (21), a presser foot lifting cam (22) and a thread cutting crank wheel (23), and the combination wheel (20) is provided with different functional wheels which complete needle pitch adjusting action, positioning feed dog (91) zero needle pitch position action, presser foot lifting action and thread cutting action under the driving of a driving motor (10) in different driving corners.

9. A sewing machine with a stitch-free and thread-cutting operation at zero stitch length according to claim 2, characterized in that the operating fulcrum of the rotating lever (41) is a slider (42), the slider (42) is located in the middle of the rotating lever (41), a lever support shaft (43) is hinged to one end of the rotating lever (41), and the lever support shaft (43) is located on the machine body (45).