Stitch length adjusting mechanism and sewing machine

Abstract

The utility model discloses a stitch length adjusting mechanism and a sewing machine, the stitch length adjusting mechanism comprises a base, an adjusting rod, a knob and a locking piece, the adjusting rod can rotate around the axis of the adjusting rod relative to the base; the adjusting rod is in sliding connection with the knob in the axial direction, and the knob and the adjusting rod can rotate synchronously; the locking piece is movably arranged on the base in the direction perpendicular to the axial direction of the adjusting rod, and the locking piece is provided with a locking position and an unlocking position; an unlocking structure is arranged between the knob and the locking piece, the knob is provided with a first position and a second position relative to the adjusting rod, and when the locking piece is located at the locking position, the knob is located at the first position; when the knob moves from the first position to the second position, the unlocking structure drives the locking piece to be far away from the adjusting rod and move to the unlocking position, and unlocking operation of the stitch length adjusting mechanism is simple.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine technical field, concretely relates to a stitch length adjusting mechanism and sewing machine with stitch length adjusting mechanism. BACKGROUND

[0002] The existing sewing machine usually utilizes stitch length adjusting mechanism to adjust the size of stitch length to meet the demand of different stitch length during sewing, and most stitch length adjusting mechanisms are provided with stud which can rotate around its own axial line, and the stitch length is adjusted by rotating the stud. The sewing machine will produce certain vibration during working process, and the vibration is easy to cause the stud to rotate by itself, and the mis-touch of operator is easy to cause the adjusting rod to rotate, therefore, the stitch length adjusting mechanism usually sets locking structure inside or outside, when the stitch length adjusting mechanism is not used, the locking structure locks the stud, and when the stitch length adjusting mechanism is used, the locking of the stud by the locking structure is released. Most locking mechanisms are complex in structure, and when the stitch length adjusting mechanism is used, the operator usually needs to unlock with one hand and rotate the stud with the other hand, and the operation is complex. SUMMARY

[0003] The utility model aims at providing a new stitch length adjusting mechanism.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme of a stitch length adjusting mechanism, which comprises:

[0005] A base is fixedly connected with the shell of the sewing machine;

[0006] An adjusting rod is rotatably arranged relative to the base around its own axial line;

[0007] A knob is slidably connected with the adjusting rod along the axial direction of the adjusting rod, and the knob and the adjusting rod are fixed with each other around the axial line of the adjusting rod, so that the knob and the adjusting rod can synchronously rotate;

[0008] A locking piece is movably arranged on the base along the direction perpendicular to the axial direction of the adjusting rod, and the locking piece has a locking position and an unlocking position, the adjusting rod and the base are locked with each other when the locking piece is in the locking position, and the adjusting rod can rotate relative to the base when the locking piece is in the unlocking position;

[0009] The stitch length adjusting mechanism further comprises an unlocking structure arranged between the knob and the locking piece, the knob has a first position and a second position relative to the adjusting rod, the knob is in the first position when the locking piece is in the locking position, and the unlocking structure drives the locking piece to move away from the adjusting rod and to the unlocking position when the knob moves from the first position to the second position.

[0010] In some embodiments, the adjusting rod is provided with locking grooves, and the locking member is inserted into the locking grooves when the locking member is in the locking position.

[0011] In some embodiments, one of the knob and the adjusting rod is provided with a limiting groove, and the other is provided with a limiting member, the limiting groove extending along the axial direction of the adjusting rod and being offset from the axial centerline of the adjusting rod, and the limiting member is movably inserted into the limiting groove.

[0012] In some embodiments, the outer circumferential portion of the adjusting rod is provided with a plurality of tooth grooves, the tooth grooves being equidistantly distributed and extending along the length direction of the adjusting rod, and the tooth grooves can be divided into first groove segments and second groove segments which are in communication with each other along the length direction; the first groove segments constitute the limiting groove, the knob is provided with the limiting member, and the limiting member is inserted into one of the first groove segments; and when the locking member is in the locking position, the locking member is inserted into the second groove segment of one of the tooth grooves.

[0013] In some embodiments, the unlocking structure comprises an unlocking member movably arranged on the base along a direction perpendicular to the axial direction of the adjusting rod, the unlocking member is connected with the locking member, and the unlocking member has a first driving surface; the unlocking structure comprises a second driving surface arranged on the knob, the first driving surface and the second driving surface each extend along the axial direction of the adjusting rod and along a direction perpendicular to the axial direction of the adjusting rod at the same time, and the first driving surface and the second driving surface abut against each other.

[0014] In some embodiments, when the knob moves from the first position to the second position, the knob approaches the base; the first driving surface and the second driving surface each extend along a direction away from the base and along a direction away from the adjusting rod at the same time.

[0015] In some embodiments, the first driving surface is in the shape of an arc extending around the axial centerline of the adjusting rod.

[0016] In some embodiments, the second driving surface is in the shape of an arc extending around the axial centerline of the adjusting rod.

[0017] In some embodiments, the second driving surface is in the shape of a ring extending around the axial centerline of the adjusting rod.

[0018] In some embodiments, the locking member has a main body portion and a locking portion, the unlocking member is provided with a connecting hole, at least part of the locking portion passes through the unlocking member from the connecting hole, and the main body portion abuts against a side of the connecting hole away from the adjusting rod.

[0019] In some embodiments, the base has two mounting portions spaced apart along a direction perpendicular to the axial direction of the adjusting rod. The two mounting portions have through holes that extend along a direction perpendicular to the axial direction of the adjusting rod and communicate with each other. The locking member is movably inserted into the through holes. A mounting groove is formed between the two mounting portions, and the unlocking member is movably inserted into the mounting groove.

[0020] In some embodiments, the stitch spacing adjustment mechanism includes a first elastic element disposed between the locking member and the base, the first elastic element being used to provide the force required to drive the locking member to the locking position.

[0021] In some embodiments, the stitch spacing adjustment mechanism includes a second elastic element disposed between the adjustment rod and the knob, the second elastic element being used to provide the force required to drive the knob to the first position.

[0022] Another objective of this invention is to provide a sewing machine.

[0023] To achieve the above objectives, the technical solution adopted by this utility model is: a sewing machine, including the above-mentioned stitch length adjustment mechanism.

[0024] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: The sewing machine of this utility model has a stitch length adjustment mechanism that, through a locking member mounted on the base, can lock the adjusting rod between the adjusting rod and the base, thereby preventing the adjusting rod from rotating due to sewing machine vibration or accidental operation by the operator. The locking member is movably arranged in a direction perpendicular to the axial direction of the adjusting rod, making the locking more stable. When using the stitch length adjustment mechanism, by driving the knob to move along the axial direction of the adjusting rod, the locking member can be released when the knob moves from the first position to the second position. Afterwards, simply maintaining the knob in the second position and rotating the knob will drive the adjusting rod to rotate, thereby adjusting the stitch length. The unlocking operation is simple. Attached Figure Description

[0025] Appendix Figure 1 This is an exploded view of a sewing machine component structure according to a specific embodiment of the present invention;

[0026] Appendix Figure 2 For the appendix Figure 1 A schematic diagram of the middle section structure;

[0027] Appendix Figure 3 This is a three-dimensional schematic diagram of the base;

[0028] Appendix Figure 4 A three-dimensional schematic diagram of the adjusting rod;

[0029] AppendixFigure 5 is a perspective view of the knob;

[0030] attached Figure 6 is a partial sectional view of the knob in the first position;

[0031] attached Figure 7 is a partial sectional view of the knob in the second position; Figure 6 is an enlarged view of A in the middle;

[0032] attached Figure 8 is a partial sectional view of the knob in the second position;

[0033] Wherein: 100, the shell; 1, the base; 11, the mounting groove; 12, the mounting part; 13, the through hole; 14, the mounting hole; 2, the adjusting rod; 21, the tooth groove; 211, the first slot section; 212, the second slot section; 3, the knob; 31, the limiting piece; 32, the second driving surface; 33, the insertion slot; 34, the perforation; 4, the locking piece; 41, the main body; 42, the locking part; 5, the first elastic piece; 6, the second elastic piece; 7, the unlocking piece; 71, the first driving surface; 72, the connecting hole; 73, the connecting part; 74, the driving part; 8, the screw. DETAILED DESCRIPTION

[0034] The technical solutions of the present application will be described in detail below with reference to the drawings and specific embodiments, so that the advantages and features of the present application are more easily understood by those skilled in the art. 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.

[0035] Referring to Figure 1 A sewing machine is shown, which comprises a shell 100 and a stitch spacing adjusting mechanism arranged on the shell 100, the stitch spacing adjusting mechanism comprising a base 1, an adjusting rod 2 and a knob 3. Wherein, the base 1 is fixedly connected with the shell 100 of the sewing machine, the adjusting rod 2 is rotatably arranged about its own axis relative to the base 1, the knob 3 is slidably connected with the adjusting rod 2 along the axial direction of the adjusting rod 2, and the knob 3 is fixedly connected with the adjusting rod 2 about the axis of the adjusting rod 2, and the knob 3 can drive the adjusting rod 2 to rotate by rotating the knob 3, so as to adjust the stitch spacing.

[0036] The needle spacing adjusting mechanism further comprises a locking member 4 movably arranged on the base 1 in a direction perpendicular to the axial direction of the adjusting rod 2, the locking member 4 having a locking position and an unlocking position, the adjusting rod 2 being locked with the base 1 in the locking position of the locking member 4, the adjusting rod 2 being rotatable relative to the base 1 in the unlocking position of the locking member 4. When the needle spacing adjusting mechanism is not in use, the adjusting rod 2 is locked with the base 1 by the locking member 4, so as to avoid rotation of the adjusting rod 2 due to vibration of the sewing machine or accidental touch of the operator, thereby ensuring the sewing quality.

[0037] The needle spacing adjusting mechanism further comprises an unlocking structure arranged between the knob 3 and the locking member 4, the knob 3 having a first position and a second position relative to the adjusting rod 2, the knob 3 being in the first position when the locking member 4 is in the locking position. When the knob 3 is moved from the first position to the second position, the unlocking structure drives the locking member 4 to move away from the adjusting rod 2 and to the unlocking position. When the needle spacing adjusting mechanism is in use, the knob 3 is moved from the first position to the second position along the axial direction of the adjusting rod 2, so as to release the locking between the adjusting rod 2 and the base 1, and then the adjusting rod 2 is rotated by rotating the knob 3, which is simple to operate.

[0038] In the embodiment, the needle spacing adjusting mechanism comprises a first elastic member 5 arranged between the locking member 4 and the base 1, the first elastic member 5 being configured to provide a force required for driving the locking member 4 to move to the locking position. Specifically, the first elastic member 5 is configured to provide a force required for driving the locking member 4 to move close to the adjusting rod 2.

[0039] In the embodiment, the needle spacing adjusting mechanism comprises a second elastic member 6 arranged between the adjusting rod 2 and the knob 3, the second elastic member 6 being configured to provide a force required for driving the knob 3 to move to the first position. In the embodiment, when the knob 3 is moved from the first position to the second position, the knob 3 is moved close to the base 1, i.e. when the needle spacing adjusting mechanism is in use, the knob 3 is pressed towards the casing 100, so as to release the locking between the adjusting rod 2 and the base 1. The second elastic member 6 provides a force required for driving the knob 3 to move away from the base 1.

[0040] In the embodiment, as shown in Figure 2 , Figure 6 , the first elastic member 5 is a spring arranged between the base 1 and the locking member 4, as shown in Figure 1 , Figure 8The second elastic member 6 is a spring arranged between the adjusting rod 2 and the knob 3. Under the action of the first elastic member 5 and the second elastic member 6, when no external force is applied, the knob 3 can automatically move to the first position, and the locking member 4 can automatically move to the locking position, thereby realizing the self-locking of the adjusting rod 2. At the same time, when the needle spacing adjustment mechanism is finished, the operator only needs to release the knob 3, and under the action of the second elastic member 6, the knob 3 automatically returns to the first position, and under the action of the first elastic member 5, the locking member 4 automatically moves to the locking position, without the operator performing any operation, thereby providing convenience for the operator.

[0041] In some embodiments, the outer side of the adjusting rod 2 is provided with a locking groove, which includes a plurality of circumferentially spaced grooves. When the locking member 4 is in the locking position, the locking member 4 is inserted into the locking groove, thereby realizing the locking between the adjusting rod 2 and the base 1. When the locking member 4 is in the unlocking position, the locking member 4 is separated from the locking groove, and the adjusting rod 2 can rotate relative to the base 1.

[0042] In some embodiments, one of the knob 3 and the adjusting rod 2 is provided with a limiting groove, and the other is provided with a limiting member 31. The limiting groove extends along the axial direction of the adjusting rod 2 and is arranged away from the center line of the adjusting rod 2. The limiting member 31 is movably inserted into the limiting groove. Through the cooperation between the limiting member 31 and the limiting groove, the knob 3 and the adjusting rod 2 are locked in the direction of the center line of the adjusting rod 2. At the same time, the limiting member 31 can move along the length direction of the limiting groove, thereby realizing the relative movement of the knob 3 in the axial direction of the limiting member 31.

[0043] In this embodiment, the outer side of the adjusting rod 2 is provided with a plurality of tooth grooves 21, which are arranged at equal intervals and extend along the length direction of the adjusting rod 2. Referring to Figure 4 As shown in the figure, the tooth groove 21 is divided into a first groove section 211 and a second groove section 212 which are in communication with each other along the length direction. The first groove section 211 constitutes the above-mentioned limiting groove, and the knob 3 is provided with a limiting member 31 which is inserted into the first groove section 211. The second groove section 212 constitutes the above-mentioned locking groove, and when the locking member 4 is in the locking position, the locking member 4 is inserted into the second groove section 212. Referring to Figure 6 、 Figure 7 As shown in the figure, the first groove section 211 is located away from the base 1, and the second groove section 212 is located close to the base 1. By arranging the limiting groove on the adjusting rod 2 and integrating the locking groove with the limiting groove, when producing the adjusting rod 2, only the tooth groove 21 extending along the axial direction of the adjusting rod 2 needs to be opened on the outer side of the adjusting rod 2, and the production is simpler.

[0044] In this embodiment, referring to Figure 5As shown in the figure, the knob 3 is provided with a slot 33 with its notch facing the base 1, and the partial adjusting rod 2 is axially movably inserted into the slot 33, and the partial tooth groove 21 is located in the slot 33, and specifically, the first groove segment 211 of the tooth groove 21 is located in the slot 33. The slot wall of the slot 33 is provided with a protrusion extending inwardly, which in this embodiment is a strip extending along the axial direction of the adjusting rod 2, and the protrusion constitutes the above-mentioned limiting piece 31 and is slidably inserted into the tooth groove 21.

[0045] In this embodiment, as shown in the figure, Figure 6 、 Figure 8 As shown in the figure, the slot bottom of the slot 33 is provided with a through hole 34, and the end of the adjusting rod 2 away from the base 1 extends into the through hole 34. The end of the adjusting rod 2 away from the base 1 is connected with a screw 8, and the screw 8 is located on the side of the through hole 34 away from the base 1. The cross section of the head of the screw 8 is larger than the cross section of the through hole 34, so as to limit the relative displacement of the adjusting rod 2 and the knob 3, and avoid that the knob 3 moves out of range relative to the adjusting rod 2 and separates from the adjusting rod 2 under the action of the force of the second elastic piece 6.

[0046] In this embodiment, the unlocking structure includes an unlocking piece 7 movably arranged on the base 1 in a direction perpendicular to the axial direction of the adjusting rod 2, and the unlocking piece 7 is connected with the locking piece 4, so that the unlocking piece 7 can drive the locking piece 4 to move in a direction perpendicular to the axial direction of the adjusting rod 2.

[0047] In this embodiment, the unlocking piece 7 has a first driving surface 71, and the unlocking structure includes a second driving surface 32 arranged on the knob 3, and the first driving surface 71 and the second driving surface 32 each extend in the axial direction of the adjusting rod 2 and in a direction perpendicular to the axial direction of the adjusting rod 2 at the same time, and the first driving surface 71 and the second driving surface 32 abut against each other. When the knob 3 moves in the axial direction of the adjusting rod 2 from the first position to the second position, the first driving surface 71 and the second driving surface 32 slide in cooperation, so that the unlocking piece 7 moves in a direction perpendicular to the axial direction of the adjusting rod 2, and the unlocking piece 7 drives the locking piece 4 to move together and away from the adjusting rod 2, so that the locking piece 4 can move to the unlocking position and be separated from the tooth groove 21, and the locking between the adjusting rod 2 and the base 1 is released.

[0048] In this embodiment, as shown in the figure, Figure 6 、 Figure 8 The first driving surface 71 and the second driving surface 32 each extend in a direction away from the base 1 and in a direction away from the adjusting rod 2 at the same time, and when the knob 3 approaches the base 1, the knob 3 drives the unlocking piece 7 to drive the locking piece 4 to separate from the tooth groove 21.

[0049] In some embodiments, the first driving surface 71 is arc-shaped extending around the axis of the adjustment rod 2, or the second driving surface 32 is arc-shaped extending around the axis of the adjustment rod 2, and the first driving surface 71 and the second driving surface 32 are kept in abutment with each other during the rotation of the knob 3, so that the locking member 4 is maintained in the unlocked position.

[0050] In the present embodiment, the second driving surface 32 is annular extending around the axis of the adjustment rod 2, so that the second driving surface 32 rotates around the axis of the adjustment rod 2 during the rotation of the knob 3 after the locking of the locking member 4 is released, and the second driving surface 32 can keep abutment with the first driving surface 71 and maintain the locking member 4 in the unlocked position, thereby ensuring the normal rotation of the adjustment rod 2.

[0051] In the present embodiment, the locking member 4 has a main body part 41 and a locking part 42, and the unlocking member 7 is provided with a connecting hole 72 through which only the locking part 42 can pass, as shown in Figure 7 The at least part of the locking part 42 passes through the unlocking member 7 from the connecting hole 72, and the main body part 41 abuts against the side of the connecting hole 72 away from the adjustment rod 2. The locking part 42 passing through the connecting hole 72 cooperates with the tooth groove 21 to lock the adjustment rod 2, and when the unlocking operation is performed, the main body part 41 is driven by the unlocking member 7 to move away from the adjustment rod 2, thereby driving the locking part 42 to disengage from the tooth groove 21. When the needle pitch adjustment mechanism is used, the locking member 4 is driven by the first elastic member 5 to move towards the adjustment rod 2, and the main body part 41 pushes the unlocking member 7 to reset. The connecting hole 72 is inserted in the manner of connecting, which on the one hand reduces the constraint on the locking member 4, increases the freedom of relative movement between the locking member 4 and the unlocking member 7, and avoids the situation that the two are stuck during the movement away from and close to the adjustment rod 2. At the same time, the connecting manner simplifies the connection structure of the locking member 4 and the unlocking member 7, and reduces the production difficulty of the two.

[0052] In the present embodiment, the base 1 is provided with a mounting groove 11, and the unlocking member 7 is movably arranged in the mounting groove 11 in the direction perpendicular to the axial direction of the adjustment rod 2. The mounting groove 11 can provide guidance for the movement of the unlocking member 7, and the two side groove walls of the mounting groove 11 in the direction perpendicular to the adjustment rod 2 can limit the unlocking member 7, thereby indirectly limiting the displacement of the locking member 4 and preventing the two from moving out of range.

[0053] In the present embodiment, the base 1 is provided with two mounting parts 12 spaced apart in the direction perpendicular to the axial direction of the adjustment rod 2, and the two mounting parts 12 are respectively provided with through holes 13 extending in the direction perpendicular to the axial direction of the adjustment rod 2 and communicating with each other, and the locking member 4 is movably arranged in the through hole 13, and the through hole 13 provides guidance for the movement of the locking member 4. In the present embodiment, the first elastic member 5 is also arranged in the through hole 13. As shown in Figure 6 、 Figure 7As shown, the cross-sectional area of the through hole 13 of the mounting portion 12 close to the adjusting rod 2 away from the adjusting rod 2 is greater than the cross-sectional area close to the adjusting rod 2, so as to limit the displacement of the locking member 4 close to the adjusting rod 2.

[0054] In the embodiment, the mounting groove 11 is formed between the two mounting portions 12, and the unlocking member 7 is movably arranged between the two mounting portions 12. Specifically, referring to Figure 2 As shown, the unlocking member 7 comprises a connecting portion 73 and a driving portion 74 extending from one side of the connecting portion 73, the connecting portion 73 is inserted into the mounting groove 11, and the driving portion 74 extends out of the mounting groove 11 and abuts against the second driving surface 32 of the knob 3.

[0055] In the embodiment, the base 1 has a mounting hole 14, the adjusting rod 2 is inserted into the mounting hole 14 along the axial direction, and one end of the adjusting rod 2 extends into the casing 100 from the mounting hole 14. The adjusting rod 2 is movably arranged relative to the base 1 along the axial direction and rotatable relative to the base 1 about the axial center line of the adjusting rod 2. In the embodiment, referring to Figure 3 As shown, the mounting hole 14 is a circular hole, and the mounting portions 12 are arranged outside the mounting hole 14, and the two mounting portions 12 are arranged at intervals along the radial direction of the mounting hole 14.

[0056] In summary, the sewing machine of the embodiment can realize the locking between the adjusting rod 2 and the base 1 through the locking member 4 arranged on the base 1, so as to avoid the rotation of the adjusting rod 2 due to the vibration of the sewing machine or the accidental touch of the operator. The locking member 4 is movably arranged along the direction perpendicular to the axial direction of the adjusting rod 2, so the locking is more stable. When using the stitch length adjusting mechanism, the locking of the locking member 4 can be released by driving the knob 3 to move along the axial direction of the adjusting rod 2, so that the knob 3 moves from the first position to the second position, and then the adjusting rod 2 can be rotated by maintaining the knob 3 at the second position and rotating the knob 3, so as to adjust the stitch length. The unlocking operation is simple.

[0057] The above embodiments are only for illustrating the technical concept and characteristics of the utility model, and the purpose is to enable the person skilled in the art to understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit and essence of the utility model shall be covered within the protection scope of the utility model.

Claims

1. A stitch length adjustment mechanism characterized by: The needle spacing adjusting mechanism comprises: a base fixedly connected with a cabinet of a sewing machine; an adjusting rod rotatably arranged on the base about an axis of the adjusting rod; a knob slidably connected with the adjusting rod along an axial direction of the adjusting rod, the knob being fixed with the adjusting rod about the axis of the adjusting rod so that the knob and the adjusting rod can rotate synchronously; a locking member movably arranged on the base along a direction perpendicular to the axial direction of the adjusting rod, the locking member having a locking position and an unlocking position, the adjusting rod being locked with the base when the locking member is in the locking position, the adjusting rod being rotatable relative to the base when the locking member is in the unlocking position; the needle spacing adjusting mechanism further comprising an unlocking structure arranged between the knob and the locking member, the knob having a first position and a second position relative to the adjusting rod, the knob being in the first position when the locking member is in the locking position, the unlocking structure driving the locking member away from the adjusting rod and moving the locking member to the unlocking position when the knob moves from the first position to the second position.

2. The gauge adjustment mechanism of claim 1, wherein: the adjusting rod being provided with locking grooves, the locking grooves being spaced apart along a circumferential direction of the adjusting rod, the locking member being inserted in the locking grooves when the locking member is in the locking position, the locking member being separated from the locking grooves when the locking member is in the unlocking position.

3. The gauge adjustment mechanism of claim 1, wherein: one of the knob and the adjusting rod being provided with a limiting groove, the other being provided with a limiting member, the limiting groove extending along the axial direction of the adjusting rod and being arranged away from the axis of the adjusting rod, the limiting member being movably inserted in the limiting groove.

4. The gauge adjustment mechanism of claim 3, wherein: an outer circumferential portion of the adjusting rod being provided with a plurality of tooth grooves, the tooth grooves being equidistantly distributed along a length direction of the adjusting rod, the tooth grooves being divided into first groove segments and second groove segments which are in communication with each other along the length direction, the first groove segments constituting the limiting groove, the knob being provided with the limiting member, the limiting member being inserted in one of the first groove segments, the locking member being inserted in one of the second groove segments when the locking member is in the locking position.

5. The gauge adjustment mechanism of claim 1, wherein: the unlocking structure comprising an unlocking member movably arranged on the base along a direction perpendicular to the axial direction of the adjusting rod, the unlocking member being connected with the locking member, the unlocking member having a first driving surface; the unlocking structure comprising a second driving surface arranged on the knob, the first driving surface and the second driving surface each extending along the axial direction of the adjusting rod and along a direction perpendicular to the axial direction of the adjusting rod at the same time, the first driving surface and the second driving surface abutting against each other.

6. The gauge adjustment mechanism of claim 5, wherein: the knob moving towards the base when the knob moves from the first position to the second position, the first driving surface and the second driving surface each extending away from the base and away from the adjusting rod at the same time.

7. The gauge adjustment mechanism of claim 5, wherein: the first driving surface being in an arc shape extending about the axis of the adjusting rod; alternatively, the second driving surface being in an arc shape extending about the axis of the adjusting rod; alternatively, the second driving surface being in an annular shape extending about the axis of the adjusting rod.

8. The gauge adjustment mechanism of claim 5, wherein: The locking member has a body part and a locking part, the unlocking member is provided with a connecting hole, at least part of the locking part passes through the unlocking member from the connecting hole, and the body part is arranged on the side of the connecting hole away from the adjusting rod; And / or, the base is provided with two installation parts spaced apart along the direction perpendicular to the axial direction of the adjusting rod, the two installation parts are provided with through holes extending along the direction perpendicular to the axial direction of the adjusting rod and communicating with each other, the locking member is movably inserted into the through holes, and an installation slot is formed between the two installation parts, and the unlocking member is movably inserted into the installation slot.

9. The gauge adjustment mechanism of claim 1, wherein: The stitch length adjusting mechanism comprises a first elastic member arranged between the locking member and the base, and the first elastic member is used to provide the force required to drive the locking member to move to the locking position; And / or, the stitch length adjusting mechanism comprises a second elastic member arranged between the adjusting rod and the knob, and the second elastic member is used to provide the force required to drive the knob to move to the first position.

10. A sewing machine characterized by: The stitch length adjusting mechanism comprises the stitch length adjusting mechanism according to any one of claims 1 to 9.

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