Sewing machine adjusting mechanism and sewing machine

Abstract

The utility model discloses a sewing machine adjusting mechanism and a sewing machine, the adjusting mechanism comprises a fixed seat, a rotating piece, a push rod, a limiting block and a limiting pin, the fixed seat is provided with a first limiting surface and a limiting groove; the rotating piece is rotationally arranged on the fixed seat around a rotating center line extending in the front-back direction, a protruding part is fixedly arranged at the front end of the rotating piece, and the protruding part abuts against the first limiting face; the push rod extends in the front-back direction, and the rear portion of the push rod is in threaded connection with the rotating piece. The limiting block can be movably arranged in the length direction of the push rod, and a locking mechanism is arranged between the limiting block and the push rod. The limiting pin is fixedly connected with the limiting block, and the limiting pin is inserted into the limiting groove; the push rod is provided with a limit position relative to the fixing seat, when the push rod is located at the limit position, the limiting block abuts against the protruding part, and the stability of the adjusting mechanism is better.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a sewing machine adjusting mechanism and a sewing machine. Background Art

[0002] Some sewing machines are equipped with an adjustment mechanism for adjusting stitch length or other modes or functions. The adjustment mechanism generally includes a rotating member and a driving member. The rotating member is rotatable relative to the housing. A linkage structure is provided between the rotating member and the driving member, allowing the driving member to move back and forth during the rotating member's rotation, thereby triggering a switch inside the housing or driving components inside the housing to move or rotate, thereby adjusting the sewing machine's state. When the driving member moves forward and contacts other components, it exerts a force on the rotating member in a backward direction. If the operator accidentally over-rotates the rotating member, causing the driving member to move forward too much, the force applied to the rotating member increases, which can easily damage the adjustment mechanism structure. If the rotating member is over-rotated, causing the driving member to move excessively backward, it can also easily damage the adjustment mechanism, affecting its normal function. Therefore, how to prevent damage to the adjustment mechanism caused by excessive rotation of the rotating member is a pressing issue. Utility Model Content

[0003] The purpose of the utility model is to provide a new regulating mechanism.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a sewing machine adjustment mechanism, comprising:

[0005] A fixing seat, wherein the front end portion of the fixing seat has a first limiting surface, the first limiting surface faces forward, and the fixing seat has a limiting groove, the notch of the limiting groove faces forward;

[0006] a rotating member rotatably disposed on a fixed seat around a rotation centerline, the rotation centerline extending in a front-to-back direction, a protrusion fixedly disposed on a front end portion of the rotating member, the protrusion extending outwardly from an outer side of the rotating member, the protrusion abutting against the first limiting surface;

[0007] A push rod extending in a front-to-rear direction, wherein a rear portion of the push rod is threadedly connected to the rotating member;

[0008] A limit assembly includes a limit block and a limit pin, wherein the limit block can be movably arranged along the length direction of the push rod, and a locking mechanism is provided between the limit block and the push rod for locking the two; the limit pin is fixedly connected to the limit block and inserted into the limit slot;

[0009] The push rod has limit positions relative to the fixed seat, and when the push rod is in the limit position, the limit block abuts against the protruding part, and the protruding part is located between the first limit surface and the limit block in the front-rear direction.

[0010] In some embodiments, a fixing member is fixed on the push rod, and an elastic member is arranged between the limit block and the fixing member, and the elastic member is used to provide the force required to drive the limit block to move towards the protruding part.

[0011] In some embodiments, the fixing member is a first clamping spring, and the outer side of the push rod is provided with an annular clamping groove, and the first clamping spring is clamped in the annular clamping groove.

[0012] In some embodiments, the elastic member is a spring, and the spring is sleeved on the outer side of the push rod.

[0013] In some embodiments, the limit block comprises a first clamping arm and a second clamping arm, the first clamping arm and the second clamping arm are arranged at intervals in a first direction, the first direction is perpendicular to the axial direction of the push rod, a through hole is formed between the first clamping arm and the second clamping arm in the front-rear direction, the push rod is arranged in the through hole, and the locking mechanism comprises a bolt configured to drive the first clamping arm and the second clamping arm to approach each other and clamp the push rod.

[0014] In some embodiments, the rear end of the fixed seat has a second limit surface facing the rear, and the rear end of the rotating member is fixedly provided with a second clamping spring abutting against the second limit surface.

[0015] In some embodiments, the fixed seat has a mounting cavity extending in the front-rear direction, and the rotating member is rotatably arranged in the mounting cavity, the cavity wall of the mounting cavity is provided with an annular accommodating groove, and a sealing ring is arranged in the accommodating groove between the outer side wall of the rotating member and the groove wall of the accommodating groove.

[0016] In some embodiments, the limit block is provided with a mounting groove extending in the front-rear direction, and the limit pin is clamped in the mounting groove, and the axial center line of the limit pin is parallel to the axial center line of the push rod.

[0017] In some embodiments, the rotating member is provided with a connecting groove, the groove opening of the connecting groove faces the front, the groove wall of the connecting groove is provided with a first thread, the rear end of the push rod is inserted into the connecting groove, and the outer side wall of the rear end of the push rod is provided with a second thread.

[0018] In some embodiments, the adjusting mechanism comprises a knob and a driving rod, a front end of the driving rod is fixedly connected with the rotating member, a rear end of the driving rod is fixedly connected with the knob, an axial line of the driving rod extends in line with the rotating center line, a plurality of first teeth are arranged at intervals on an outer circumferential portion of the driving rod; the adjusting mechanism further comprises a linkage gear of a scale disc, the scale disc is rotatably arranged around the rotating center line and the fixed seat, the scale disc is annular, a plurality of second teeth are arranged at intervals on an inner circumferential portion of the scale disc, the linkage gear is in mesh with the first teeth, and the linkage gear is in mesh with the second teeth.

[0019] In some embodiments, the knob has an insertion portion and an operation portion, the insertion portion is fixedly arranged at a front portion of the operation portion, the insertion portion is inserted into a central hole of the annular scale disc, a third limiting surface is formed at an interface between the insertion portion and the operation portion, the third limiting surface faces forward, and the third limiting surface abuts against a front end portion of the scale disc.

[0020] Another object of the present application is to provide a sewing machine.

[0021] To achieve the above object, the present application adopts the technical scheme of: a sewing machine comprising the above adjusting mechanism, the sewing machine further comprises an adjusting arm, the adjusting arm is rotatably arranged around a rotating shaft, an axial direction of the rotating shaft is perpendicular to a front-rear direction, the adjusting arm has a driving portion, the driving portion is arranged at intervals with the rotating shaft, and the driving portion is located at a front side of the push rod along an axial direction of the push rod.

[0022] Thanks to the use of the above technical scheme, the present application has the following advantages compared with the prior art: when the push rod applies a reverse force to the rotating member due to excessive forward displacement, the adjusting mechanism of the present application can prevent the rotating member from moving backward by the cooperation between the protruding portion arranged at the front end of the rotating member and the first limiting surface of the fixed seat, thereby avoiding damage to the adjusting mechanism. Meanwhile, the push rod has a limit position, when the push rod moves backward to the limit position, the limiting block fixedly arranged on the push rod will directly abut against the protruding portion of the rotating member, thereby preventing the push rod and the rotating member from moving relative to each other in the front-rear direction, since the rotating member cannot move relative to the fixed seat, the effect of avoiding damage to the adjusting mechanism is achieved. Meanwhile, the limiting block can move along the push rod, and the user can adjust the position of the limiting block according to the requirement, thereby adjusting the limit position of the push rod. BRIEF DESCRIPTION OF DRAWINGS

[0023] FIG. 1 is a side view of an adjusting mechanism of a sewing machine according to an embodiment of the present application; Figure 1 FIG. 2 is a side view of an adjusting arm of the sewing machine according to the embodiment of the present application;

[0024] FIG. 3 is a side view of the adjusting mechanism of the sewing machine according to another embodiment of the present application; Figure 2 FIG. 4 is a side view of the adjusting arm of the sewing machine according to the embodiment of the present application; and Figure 1 FIG. 5 is a side view of the adjusting mechanism of the sewing machine according to another embodiment of the present application.

[0025] Fig. 2 is a schematic view of the adjusting mechanism of the present embodiment; Figure 3 Fig. 3 is a schematic view of the adjusting mechanism of the present embodiment;

[0026] Fig. 4 is a schematic view of the adjusting mechanism of the present embodiment; Figure 4 Fig. 5 is a schematic view of the adjusting mechanism of the present embodiment;

[0027] Fig. 6 is a schematic view of the adjusting mechanism of the present embodiment; Figure 5 Fig. 7 is a schematic view of the adjusting mechanism of the present embodiment; Figure 4 Fig. 8 is a schematic view of the adjusting mechanism of the present embodiment;

[0028] Fig. 9 is a schematic view of the adjusting mechanism of the present embodiment; Figure 6 Fig. 10 is a schematic view of the adjusting mechanism of the present embodiment;

[0029] Wherein: 1, fixed seat; 11, first limiting surface; 12, limiting groove; 13, second limiting surface; 14, mounting cavity; 15, accommodating groove; 16, sealing ring; 2, rotating piece; 21, protruding part; 22, connecting groove; 221, first thread; 3, push rod; 31, annular clamping groove; 32, second thread; 41, limiting block; 411, first clamping arm; 412, second clamping arm; 413, perforation; 414, mounting groove; 42, limiting pin; 43, bolt; 5, elastic piece; 61, first clamping spring; 62, second clamping spring; 71, knob; 711, third limiting surface; 72, driving rod; 721, first tooth; 8, dial; 81, second tooth; 9, linkage gear; 100, adjusting arm; 101, driving part; 200, rotating shaft. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be described in detail below in combination with the drawings and specific embodiments, so that the advantages and features of the present application are easier for those skilled in the art to understand. Obviously, the embodiments described in the present application are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0031] The following descriptions about up, down, left, right, front, back, inside and outside are based on the observed positions when the operator rotates the knob, and the specific coordinate system can be referred to in the drawings. The purpose is only to facilitate the description of the relative position relationship of the components of the sunshade, and is not intended to indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

[0032] A sewing machine comprising Figures 1 to 3The adjusting mechanism shown in the middle, the adjusting mechanism includes fixed seat 1, rotating part 2, push rod 3 and limiting assembly, fixed seat 1 is fixedly arranged relative to the sewing machine shell, the front end of fixed seat 1 has first limiting surface 11, first limiting surface 11 faces forward, fixed seat 1 has limiting groove 12, the slot of limiting groove 12 faces forward. Rotating part 2 is rotatably arranged on fixed seat 1 around the rotating center line, the rotating center line extends along the front and back directions, the front end of rotating part 2 is fixedly arranged with protruding part 21, protruding part 21 extends outward from the outer side of rotating part 2, protruding part 21 abuts against first limiting surface 11, the cooperation between protruding part 21 and first limiting surface 11 can prevent rotating part 2 from moving backward. Push rod 3 extends along the front and back directions, the rear part of push rod 3 is threadedly connected with rotating part 2, the front end of push rod 3 can abut against driving part 101.

[0033] The limiting assembly includes limiting block 41 and limiting pin 42, limiting block 41 is movably arranged along the length direction of push rod 3, locking mechanism is arranged between limiting block 41 and push rod 3 for locking the two. Limiting pin 42 is fixedly connected with limiting block 41, limiting pin 42 is inserted in limiting groove 12. Through the cooperation of limiting pin 42 and limiting groove 12, the rotation of push rod 3 relative to fixed seat 1 can be prevented, when rotating part 2 is driven to rotate around the rotating center line, through the thread cooperation between push rod 3 and rotating part 2, push rod 3 can be driven to move forward and backward relative to rotating part 2, so that push rod 3 moves forward and backward relative to fixed seat 1.

[0034] In some embodiments, the front side of push rod 3 is provided with a control switch, by driving push rod 3 to move forward, the front end of push rod 3 can contact the control switch, so as to open or close the control switch.

[0035] In this embodiment, the sewing machine includes adjusting arm 100, adjusting arm 100 is rotatably arranged around rotating shaft 200, the axial direction of rotating shaft 200 is perpendicular to the front and back directions, adjusting arm 100 has driving part 101 for driving itself to rotate, driving part 101 is arranged apart from rotating shaft 200. Referring to Figure 1 、 Figure 2 The adjusting mechanism is arranged on the rear side of adjusting arm 100, driving part 101 is located on the front side of push rod 3, and the axial line of push rod 3 does not intersect with the axial line of rotating shaft 200. By driving push rod 3 to move forward, the front end of push rod 3 can abut against driving part 101 and push driving part 101 to move forward, so that adjusting arm 100 rotates. When push rod 3 moves backward, driving part 101 resets backward, and adjusting arm 100 rotates in the opposite direction. In this embodiment, the needle spacing of the sewing machine is adjusted by driving adjusting arm 100 to rotate.

[0036] In the embodiment, the push rod 3 has an extreme position relative to the fixed base 1, when the push rod 3 is in the extreme position, the limiting block 41 abuts against the protruding portion 21, and the protruding portion 21 is located between the first limiting surface 11 and the limiting block 41 in the front-rear direction. When the push rod 3 moves to the extreme position, even if the operator continues to rotate the rotating member 2, the relative movement between the push rod 3 and the rotating member 2 is prevented by the cooperation between the limiting block 41 and the protruding portion 21, and the relative movement between the rotating member 2 and the fixed base 1 is prevented by the cooperation between the protruding portion 21 and the first limiting surface 11, so as to ensure that the adjusting mechanism will not be damaged.

[0037] In the embodiment, as shown in Figure 1 、 Figure 2 , the limiting block 41 is located on the front side of the fixed base 1, and as the push rod 3 moves backward, the push rod 3 drives the limiting block 41 to move backward until the limiting block 41 abuts against the protruding portion 21, and the push rod 3 reaches the extreme position. In the embodiment, when the operator excessively rotates the rotating member 2 and the push rod 3 moves forward excessively, the adjusting arm 100 will generate a reaction force acting on the push rod 3 in the backward direction, and the reaction force is transmitted from the push rod 3 to the rotating member 2 to drive the rotating member 2 to move backward, and at this time, the first limiting surface 11 and the protruding portion 21 abut against each other, which can effectively prevent the adjusting mechanism from being damaged.

[0038] In the embodiment, the front side of the fixed base 1 constitutes the first limiting surface 11. In the embodiment, the protruding portion 21 protrudes outward from the outer circumferential portion of the rotating member 2, and the protruding portion 21 is integrally formed with the rotating member 2, which improves the limiting effect and thus improves the stability of the adjusting mechanism. In the embodiment, the protruding portion 21 is annular, and the abutment between the protruding portion 21 and the first limiting surface 11 is more stable.

[0039] In the embodiment, since the limiting block 41 can move relative to the push rod 3, by adjusting the position of the limiting block 41 on the push rod 3, the extreme position of the push rod 3 can be adjusted, and thus the extreme displacement of the push rod 3 moving backward relative to the fixed base 1 can be adjusted. As shown in Figure 3 、 Figure 6As shown, the limiting block 41 comprises a first clamping arm 411 and a second clamping arm 412, the first clamping arm 411 and the second clamping arm 412 are arranged at intervals along a first direction, the first direction is perpendicular to the axial direction of the push rod 3, a through hole 413 is formed between the first clamping arm 411 and the second clamping arm 412, the push rod 3 is arranged in the through hole 413. In this embodiment, the locking mechanism comprises a bolt 43, the bolt 43 is configured to drive the first clamping arm 411 and the second clamping arm 412 to approach each other and clamp the push rod 3. Specifically, one end of the first clamping arm 411 is fixedly connected with one end of the second clamping arm 412, the bolt 43 is used to connect the free end of the first clamping arm 411 and the free end of the second clamping arm 412, when the bolt 43 is detached from the first clamping arm 411 and the second clamping arm 412, the limiting block 41 can slide along the push rod 3, so as to adjust the position of the limiting block 41.

[0040] In this embodiment, the push rod 3 is fixedly provided with a fixing member, an elastic member 5 is arranged between the limiting block 41 and the fixing member, and the elastic member 5 is used to provide the force required to drive the limiting block 41 to move towards the fixing base 1. As shown in Figure 3 、 Figure 4 As shown, the fixing member is arranged on the front side of the limiting block 41, and when assembling the adjusting mechanism or adjusting the position of the limiting block 41, the limiting block 41 can be fixed more conveniently and quickly through the elastic member 5 and the fixing member. Specifically, when the locking mechanism is in the unlocked state, the limiting block 41 can move towards the fixing base 1 and abut against the protruding portion 21 under the drive of the elastic member 5, and the limiting block 41 is maintained in the state of abutting against the protruding portion 21 under the action of the elastic member 5, at this time, the limiting block 41 is locked through the locking mechanism, so that the fixing between the limiting block 41 and the push rod 3 can be completed.

[0041] In this embodiment, the fixing member is a first clasp spring 61, and the outer side of the push rod 3 is provided with an annular clamping groove 31, and the first clasp spring 61 is clamped in the annular clamping groove 31. In this embodiment, the elastic member 5 is a spring, the spring is sleeved outside the push rod 3, and the push rod 3 can provide movement guidance for the elastic member 5.

[0042] In this embodiment, the rear end of the fixing base 1 has a second limiting surface 13, the second limiting surface 13 faces the rear, and the rear end of the rotating member 2 is fixedly provided with a second clasp spring 62, the second clasp spring 62 abuts against the second limiting surface 13. The cooperation between the second clasp spring 62 and the second limiting surface 13 can prevent the rotating member 2 from moving forward relative to the fixing base 1.

[0043] In the embodiment, the fixed seat 1 has a mounting cavity 14 extending through in the front-rear direction, the rotating member 2 is rotatably arranged in the mounting cavity 14, the rear end portion of the fixed seat 1 is provided with a receiving groove 13 opening rearward, the receiving groove 13 is in communication with the mounting cavity 14, at least part of the rotating member 2 extends into the receiving groove 13 from the mounting cavity 14, and the second snap spring 62 is located in the receiving groove 13. The provision of the receiving groove 13 facilitates the positioning and installation of the second snap spring 62, and the groove bottom of the receiving groove 13 constitutes the second limiting surface 13.

[0044] In the embodiment, as shown in Figure 5 In the embodiment, the cavity wall of the mounting cavity 14 is provided with an annular accommodating groove 15, the accommodating groove 15 is provided with a sealing ring 16, and the sealing ring 16 is located between the outer side wall of the rotating member 2 and the groove wall of the accommodating groove 15. The sealing ring 16 is used to provide damping feeling when the rotating member 2 rotates, and the sealing ring 16 can also play a certain sealing role.

[0045] In the embodiment, the rotating member 2 is provided with a connecting groove 22, the groove opening of the connecting groove 22 faces forward, the groove wall of the connecting groove 22 is provided with a first thread 221, the rear end portion of the push rod 3 is inserted into the connecting groove 22, and the outer side wall of the rear end portion of the push rod 3 is provided with a second thread 32.

[0046] In the embodiment, the limiting block 41 is provided with a mounting groove 414 extending in the front-rear direction, the limiting pin 42 is clamped in the mounting groove 414, and the axis of the limiting pin 42 is parallel to the axis of the push rod 3. When the adjusting mechanism is assembled, the rotating member 2 is inserted into the mounting cavity 14 of the fixed seat from front to back, so that the protruding portion 21 abuts against the first limiting surface 11, and the rear end portion of the rotating member 2 extends into the receiving groove 13, and the second snap spring 62 is fixed to the rear end portion of the rotating member 2. The first snap spring 61 is clamped in the annular clamping groove 31, the elastic member 5 is sleeved on the push rod 3, the push rod 3 is inserted into the through hole 413 of the limiting block 41, so that the first snap spring 61, the elastic member 5 and the limiting block 41 are sequentially arranged from front to back. The rear end portion of the push rod 3 is inserted into the connecting groove 22 of the rotating member 2, and the push rod 3 and the rotating member 2 are connected together through threads. The rotating member 2 is driven to rotate so that the push rod 3 moves backward until the push rod 3 moves to a preset limit position. In the process of moving the push rod 3 backward, the limiting pin 42 fixed to the limiting block 41 is inserted into the limiting groove 12 of the fixed seat 1, and the limiting block 41 automatically abuts against the protruding portion 21 under the driving of the elastic member 5. When the push rod 3 moves to the preset limit position, the free end portion of the first clamping arm 411 and the free end portion of the second clamping arm 412 are connected through the bolt 43, and the first clamping arm 411 and the second clamping arm 412 clamp and fix the push rod 3.

[0047] In the embodiment, the adjusting mechanism further comprises a knob 71 and a driving rod 72, the front end of the driving rod 72 is fixedly connected with the rotating member 2, the rear end of the driving rod 72 is fixedly connected with the knob 71, and the axis of the driving rod 72 is co-linear with the rotation center line. By rotating the knob 71 to drive the driving rod 72 to rotate around its axis, the rotating member 2 can be driven to rotate.

[0048] In the embodiment, the adjusting mechanism further comprises a linkage gear 9 of the dial 8, and the dial 8 is rotatably arranged with the fixed seat 1 around the rotation center line. As shown in Figure 3 、 Figure 4 The dial 8 is annular, the dial 8 is sleeved on the outside of the driving rod 72, the knob 71 has an insertion part and an operation part, the insertion part is fixedly arranged at the front of the operation part, the insertion part is inserted into the center hole of the annular dial 8, and a third limiting surface 711 is formed at the joint of the insertion part and the operation part, the third limiting surface 711 faces forward, and the third limiting surface 711 abuts against the front end of the dial 8. The mutual cooperation between the third limiting surface 711 and the front end of the dial 8 can prevent the knob 71 from moving backward, and since the knob 71 is fixedly connected with the rotating member 2 through the driving rod 72, the third limiting surface 711 and the front side of the dial 8 can also prevent the rotating member from moving backward.

[0049] In the embodiment, a plurality of first teeth 721 are arranged at intervals on the outside of the driving rod 72, a plurality of second teeth 81 are arranged at intervals on the inside of the dial 8, the linkage gear 9 is engaged with the first teeth 721, and the linkage gear 9 is engaged with the second teeth 81. During the rotation of the knob 71, the driving rod 72 can drive the linkage gear 9 to rotate through the cooperation between the first teeth 721 and the linkage gear 9, and the linkage gear 9 can drive the dial 8 to rotate through the cooperation between the linkage gear 9 and the second teeth 81. In this way, during the movement of the push rod 3 forward and backward driven by the knob 71, the dial 8 will also rotate, so as to realize the visualization of the adjustment and facilitate the accurate adjustment of the operator.

[0050] In summary, the adjusting mechanism of the sewing machine of the embodiment can prevent the rotating member 2 from moving backward and maintain the stability of the adjusting mechanism when the push rod 3 applies a reverse force to the rotating member 2 due to excessive forward displacement. Meanwhile, the push rod 3 has a limit position, and when the push rod 3 moves backward to the limit position, the limit block 41 fixed on the push rod 3 directly abuts against the protruding part 21 of the rotating member 2, thereby preventing the push rod 3 and the rotating member 2 from relatively displacing in the forward and backward directions. Since the rotating member 2 cannot move relative to the fixed seat 1, the stability of the adjusting mechanism is maintained. Meanwhile, the limit block 41 can move along the push rod, and the user can adjust the position of the limit block 41 according to the requirement, thereby adjusting the limit position of the push rod 3.

[0051] The above embodiments are only used to illustrate the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A sewing machine adjustment mechanism, characterized in that: include: A fixing seat, wherein the front end portion of the fixing seat has a first limiting surface, the first limiting surface faces forward, and the fixing seat has a limiting groove, the notch of the limiting groove faces forward; A rotating member is rotatably disposed on a fixed seat around a rotation centerline, the rotation centerline extending in a front-to-back direction, a protrusion is fixedly provided at a front end portion of the rotating member, the protrusion protrudes outwardly and extends from an outer side of the rotating member, and the protrusion abuts against the first limiting surface; A push rod extending in a front-to-rear direction, wherein a rear portion of the push rod is threadedly connected to the rotating member; A limit assembly includes a limit block and a limit pin, wherein the limit block can be movably arranged along the length direction of the push rod, and a locking mechanism is provided between the limit block and the push rod for locking the two; the limit pin is fixedly connected to the limit block and inserted into the limit slot; The push rod has an extreme position relative to the fixing seat. When the push rod is at the extreme position, the limit block abuts against the protrusion, and the protrusion is located between the first limit surface and the limit block along the front-back direction.

2. The sewing machine adjustment mechanism according to claim 1, characterized in that: A fixing piece is fixed on the push rod, and an elastic piece is provided between the limiting block and the fixing piece. The elastic piece is used to provide a force required to drive the limiting block to move toward the protruding portion.

3. The sewing machine adjustment mechanism according to claim 2, characterized in that: The fixing member is a first retaining spring, an annular retaining groove is provided on the outer periphery of the push rod, and the first retaining spring is retained in the annular retaining groove; and / or the elastic member is a spring, and the spring is sleeved on the outer side of the push rod.

4. The sewing machine adjustment mechanism according to claim 1, characterized in that: The limit block includes a first clamping arm and a second clamping arm, the first clamping arm and the second clamping arm are arranged at intervals along a first direction, the first direction is perpendicular to the axis of the push rod, a through hole is formed between the first clamping arm and the second clamping arm and passes through the through hole along the front-to-back direction, the push rod is inserted into the through hole, and the locking mechanism includes a bolt, which is configured to drive the first clamping arm and the second clamping arm to move closer to each other and clamp the push rod.

5. The sewing machine adjustment mechanism according to claim 1, characterized in that: The rear end portion of the fixing seat has a second limiting surface, and the second limiting surface faces rearward. The rear end portion of the rotating member is fixed with a second clamping spring, and the second clamping spring abuts against the second limiting surface.

6. The sewing machine adjustment mechanism according to claim 1, characterized in that: The fixing seat has an installation cavity that penetrates along the front-to-back direction. The rotating member can be rotatably arranged in the installation cavity. The cavity wall of the installation cavity is provided with an annular accommodating groove. A sealing ring is provided in the accommodating groove. The sealing ring is located between the outer wall of the rotating member and the groove wall of the accommodating groove.

7. The sewing machine adjustment mechanism according to claim 1, characterized in that: The limit block is provided with an installation groove extending in the front-to-back direction, the limit pin is clamped in the installation groove, and the axis of the limit pin is parallel to the axis of the push rod; and / or the rotating member is provided with a connecting groove, the notch of the connecting groove faces forward, the groove wall of the connecting groove is provided with a first thread, the rear end portion of the push rod is inserted into the connecting groove, and the outer side wall of the rear end portion of the push rod is provided with a second thread.

8. The sewing machine adjustment mechanism according to claim 1, characterized in that: The adjustment mechanism includes a knob and a drive rod, the front end of the drive rod is fixedly connected to the rotating member, and the rear end of the drive rod is fixedly connected to the knob, the axis of the drive rod extends colinearly with the rotation center line, and a plurality of first teeth are spaced apart on the outer periphery of the drive rod; The adjustment mechanism also includes a linkage gear of a dial, the dial is rotatably arranged with the fixed seat around the rotation center line, the dial is annular, and a plurality of second teeth are spaced apart on the inner periphery of the dial, the linkage gear is engaged with the first teeth, and the linkage gear is engaged with the second teeth.

9. The sewing machine adjustment mechanism according to claim 8, characterized in that: The knob has an insertion portion and an operating portion. The insertion portion is fixed to the front of the operating portion and is inserted into the center hole of the annular scale. A third limiting surface is formed at the junction of the insertion portion and the operating portion. The third limiting surface faces forward and abuts against the front end of the scale.

10. A sewing machine, characterized in that: The sewing machine comprises an adjusting mechanism as described in any one of claims 1 to 9, and the adjusting arm is further provided with a rotational arrangement around a rotating shaft, wherein the axial direction of the rotating shaft is perpendicular to the front-to-back direction, and the adjusting arm has a driving portion, wherein the driving portion is spaced apart from the rotating shaft, and the driving portion is located at the front side of the push rod along the axial direction of the push rod.

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