阅读说明：本技术 一种具有免多走一针并在可调节针距后剪线的缝纫机 (Sewing machine with function of avoiding multiple needle feeding and trimming threads after needle pitch adjustment ) 是由 李质彬 林高宏 吴文俊 于 2021-01-30 设计创作，主要内容包括：本申请提出一种具有免多走一针并在可调节针距后剪线的缝纫机,具体涉及缝纫机制造技术领域,包括有针距调节机构和剪线机构,剪线动作在缝制前所固定的针距下执行,其特征在于,缝纫机的针距调节机构在针距调节更小后执行剪线；针距调节机构具有针距定位轮、转动杠杆和送布牙,针距定位轮具有的针距定位槽推动转动杠杆具有的滑动件间接定位送布牙更小的针距后,缝纫机执行剪线。本申请送布牙新的更小针距定位都是基于缝纫机电控系统来控制的,实现了摆动座对送布牙提供与缝制时更小的针距,并在送布牙新的更小针距下执行剪线动作,克服了缝料线迹最后留一个穿针孔的技术难题,达到剪线后余线尽可能短的技术效果,具有较高推广使用价值。(The application provides a sewing machine which avoids multiple needles and cuts thread after the needle pitch can be adjusted, in particular to the technical field of sewing machine manufacturing, the sewing machine comprises a needle pitch adjusting mechanism and a thread cutting mechanism, and the thread cutting action is executed under the fixed needle pitch before sewing; the stitch length adjusting mechanism is provided with a stitch length positioning wheel, a rotating lever and a feed dog, and after a stitch length positioning groove arranged on the stitch length positioning wheel pushes a sliding piece arranged on the rotating lever to indirectly position a smaller stitch length of the feed dog, the sewing machine carries out thread trimming. The new smaller needle pitch positioning of the feed dog is controlled based on the sewing machine electric control system, the swing seat is enabled to provide the feed dog with a smaller needle pitch when sewing, the thread cutting action is executed under the new smaller needle pitch of the feed dog, the technical problem that a needle hole is left at last in a sewing material stitch seam is solved, the technical effect that the remaining thread after thread cutting is as short as possible is achieved, and the sewing machine has higher popularization and use values.)

1. A sewing machine capable of avoiding multiple needles to move and cutting threads after the needle pitch can be adjusted comprises a needle pitch adjusting mechanism and a thread cutting mechanism, wherein the thread cutting action is executed under the fixed needle pitch before sewing.

2. A sewing machine with a stitch-free and thread-cutting after the adjustable 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 thread-cutting after the stitch length positioning wheel (21) has a stitch length positioning slot (212) to push a slider (42) of the rotating lever (41) to indirectly position the feed dog (91) at a smaller stitch length.

3. The sewing machine with the function of avoiding stitch feed and trimming after the adjustable stitch length as claimed in claim 2, characterized in that the sewing machine further comprises a swing 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 swing seat (30), the cloth feeding crank (52) is fixed on the cloth feeding shaft (51) and is hinged with the swing seat (30), and the cloth feeding shaft (51) is indirectly connected with the cloth feeding tooth (91).

4. A machine with a stitch-free and thread-cutting after the adjustable stitch length according to claim 2, characterized in that the stitch length positioning 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 stitch length positioning slot (212) at the maximum point of positive stitch length (215) or the maximum point of negative stitch length (216) of the oscillating seat (30), the maximum point of positive stitch length (215) and the maximum point of negative stitch length (216) being located at the end points of the stitch length adjusting groove (211).

5. A machine with stitch-free and thread-trimming after an adjustable 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 stitch-length-adjustable thread trimming function according to claim 2, characterized in that the needle length 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 length positioning wheel (21), and the output shaft (11) is concentric with the arc of the needle length positioning slot (212).

7. The sewing machine with the function of avoiding multiple stitch and cutting thread after the stitch length can be adjusted according to the claim 2, characterized in that the stitch length positioning wheel (21) can change the action position of the stitch length adjusting groove (211) of the stitch length positioning wheel (21) under the driving of the driving motor (10), and then the original stitch length of the swinging seat (30) can be changed through the rotating lever (41) and the connecting rod (44).

8. The sewing machine with the function of avoiding a stitch and trimming after the stitch length is adjustable according to claim 2, characterized in that the sewing machine is also 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 stitch length positioning wheel (21), a presser foot lifting cam (22) and a trimming crank wheel (23), and the combination wheel (20) is provided with different functional wheels which complete the stitch length adjusting action, the stitch length position adjusting action of the feed dog (91), the presser foot lifting action and the trimming action under the driving of the driving motor (10) in different driving corners.

9. A sewing machine with a stitch-free and with adjustable stitch length, trimming after 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), one end of the rotating lever (41) is hinged with a lever support shaft (43), and the lever support shaft (43) is located on the machine body (45).

Technical Field

The application provides a sewing machine with exempt from to walk a stitch more and trimming behind adjustable gauge needle, 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 can not adjust the gauge needle behind the current sewing machine trimming and make the excess thread overlength's of trimming technical defect, this application provides a sewing machine of trimming behind adjustable gauge needle with exempt from to walk a stitch more, 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 carries out the trimming after the gauge needle is adjusted littleer.

Preferably, the stitch length adjusting mechanism is provided with a stitch length positioning wheel, a rotating lever and a feed dog, and after the stitch length positioning wheel is provided with a stitch length positioning groove for pushing a sliding piece provided with the rotating lever to indirectly position a smaller stitch length of the feed dog, the sewing machine carries out thread trimming.

Preferably, the sewing machine is further provided with a swinging seat, a connecting rod, a cloth feeding shaft and a cloth feeding crank, 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 stitch length positioning wheel, a presser foot lifting cam and a thread trimming crank wheel, and different functional wheels of the combined wheel complete stitch length adjusting action, cloth feeding tooth stitch length position adjusting action, presser foot lifting action and thread trimming action under the driving of a driving motor in different driving rotation angles.

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 behind adjustable gauge needle is: the needle pitch adjusting mechanism of the sewing machine can perform thread trimming after the needle pitch is adjusted to be smaller; after sewing, 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 rotating lever 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 new smaller needle pitch positioning of the feed dog is controlled based on the sewing machine electric control system, the swing seat is enabled to provide the feed dog with a smaller needle pitch when sewing, the thread cutting action is executed under the new smaller needle pitch of the feed dog, the technical problem that a needle hole is left at last in a sewing material stitch seam is solved, the technical effect that the remaining thread after thread cutting is as short as possible is achieved, and the sewing machine has higher popularization and use values.

Drawings

FIG. 1 is a pictorial view of a sewing machine of the present application having a stitch free stitch and trimming after an adjustable stitch length;

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

FIG. 3 is a schematic view of a stitch length adjusting and swinging seat of the sewing machine of the present application having a stitch length adjusting and trimming function without a plurality of stitches;

FIG. 4 is a schematic view of a stitch length adjustment slot of a sewing machine of the present application having a stitch length adjustment without multiple stitches and trimming after the stitch length adjustment;

FIG. 5 is a side view of a sewing machine combination wheel of the present application having a no-over stitch and trimming after an adjustable stitch length;

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

FIG. 7 is a cut line configuration view of a sewing machine of the present application having a stitch free stitch and cutting the line after the stitch length is adjustable;

FIG. 8 is a schematic view of a presser foot lifting cam of a sewing machine of the present application having a stitch free stitch and trimming after an adjustable 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 trimming behind adjustable gauge needle, sewing machine have 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 combination wheel 20, and the combination wheel 20 is used for realizing the needle pitch adjusting action, the feed dog needle pitch position adjusting action, 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 further, the original swing angle of the swing seat 30 is changed by rotating the lever 41 and the connecting rod 44, so that the stitch length adjustment is realized, and meanwhile, the technical defect that a needle penetrating hole is left at the end of a sewing stitch is overcome. 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 assigned to the swing base 30.

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 gauge positioning groove 212 has an outer circular wall 21b and an inner circular wall 21c, the slider 42 slides between the outer circular wall 21b and the inner circular wall 21c, and when the slider 42 enters the gauge positioning groove 212, a new smaller gauge is indirectly determined, and the sewing machine performs trimming at the new smaller gauge so that the remaining thread can achieve the technical effect as short as possible. 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, and the sliding member 42 together with the rotating lever 41 pushes the feeding swing plate 31 of the swing base 30 through the link 44, so that the angle between the feeding long swing plate 33 and the feeding short swing plate 32 of the swing base 30 is changed, resulting in a smaller needle pitch than in a sewing state to achieve a shortest possible cutting margin. 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 when the swing angle of the swing base 30 is small, the feed crank 52 connecting the swing base 30 and the feed shaft 51 swings small, and at this time, the swing source for the swing base 30 to provide the forward and backward movement to the feed shaft 51 is small, so that the feed dog 91 similarly carries the same swing source. The thread trimming is executed after the needle pitch of the needle pitch adjusting mechanism of the sewing machine is adjusted to be smaller, the thread trimming is executed after the feed dog 91 obtains a new smaller needle pitch, namely the technical effect that the trimming surplus thread is as short as possible is realized by determining the smaller needle pitch according to the requirements of different sewing materials.

The thread cutting operation is performed after the slider 42 enters the gauge positioning groove 212 from the first return groove 213 or the second return groove 214 and pushes the gauge positioning groove 212, that is, the presser foot lifting operation is performed after a new smaller gauge 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 slot 212 and pushes the connecting rod 44 to indirectly change the angles of the feeding long swinging plate 33 and the feeding short swinging plate 32, which are generally reduced, the rotating column 231 of the thread cutting crank wheel 23 applies a pushing force to the thread cutting action surface 73 of the thread cutting fork wheel 71 in the thread cutting corner of the driving motor 10, and then the thread cutting action surface 73 pushes the thread cutting long shaft 76 and the last thread cutting execution end executes a thread cutting action. 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 the thread cutting of the cloth feeding tooth 91 in a new smaller stitch length state is realized.

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 new smaller needle distance 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 end execution end 64 executes the presser foot lifting action, and the sewing machine of the application also realizes the presser foot lifting action under the new smaller needle pitch of the cloth feeding teeth 91 through the presser foot lifting action, so that the sewing machine has higher 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.