Flat seaming machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a flat seaming machine. Comprising a differential adjusting mechanism, the differential adjusting mechanism comprises a differential control rod main shaft parallel to a lower shaft, and the differential control rod main shaft is connected with a differential cloth feeding shaft through a differential connecting crank, a first connecting rod, a conversion crank shaft, a second connecting rod, a differential adjusting sliding rail and a differential adjusting crank which are sequentially connected; the differential adjusting sliding rail is provided with a sliding groove, one end of the differential adjusting crank is arranged on the differential cloth feeding shaft, the other end of the differential adjusting crank is provided with a crank arm, the crank arm is arranged in the sliding groove of the differential adjusting sliding rail in a sliding mode, and the left end of the differential cloth feeding shaft is hinged to the differential tooth frame through a differential cloth feeding connecting rod. The left end of the differential control rod main shaft extends out of the machine base, and a differential adjusting assembly is arranged at the extending end. The differential adjusting assembly is arranged at the left end of the machine base, so that an electromechanical integrated electric controller can be conveniently installed at the right end of the machine base.

Description

Technical field:

[0001] The utility model belongs to the technical field of sewing machines, in particular to a stretch sewing machine. Background technology:

[0002] The interlock sewing machine is also called a special sewing machine. The stitches it sews are chain stitches. This stitch is mostly used for collar rolling, hemming, hemming, interlock seams, splicing seams and trims of knitted garments. The interlock sewing machine uses independent, reciprocating feed teeth and differential teeth to transport the fabric. The feed teeth and differential teeth move differentially and asynchronously, so that the fabric obtains the power of transportation. During sewing operations, sometimes the fabric needs to be transported faster, and sometimes it needs to be transported slower. The speed of transporting the fabric can be adjusted by adjusting the difference in the movement speed of the feed teeth and the differential teeth.

[0003] The Chinese utility model patent (authorization announcement number CN 208857468U, application date 2018.07.26, announcement date 2019.05.14) discloses a flat sewing machine, in which a differential locking nut is installed on the end side of the body of the flat sewing machine, and a differential adjustment lever is provided on one side of the differential locking nut. Figure 1 It can be seen that the differential adjustment lever is located near the belt guard, that is, the right end of the housing. The installation position of the differential adjustment lever is not suitable for the installation of the electromechanical integrated electric control on the right side of the interlock sewing machine. Summary of the invention:

[0004] The utility model aims to provide a flat sewing machine which can be suitable for the electromechanical integrated electric control installation on the right side of the flat sewing machine casing.

[0005] The utility model is achieved in this way:

[0006] A flat sewing machine comprises: a differential adjustment mechanism, wherein the differential adjustment mechanism comprises a differential control rod main shaft arranged in parallel with a lower shaft, the differential control rod main shaft is connected to a differential cloth feed shaft through a differential connecting crank, a first connecting rod, a conversion crank shaft, a second connecting rod, a differential adjustment slide rail, and a differential adjustment crank which are connected in sequence, a slide groove is arranged on the differential adjustment slide rail, one end of the differential adjustment crank is arranged on the differential cloth feed shaft, and a crank arm is arranged on the other end, the crank arm is slidably arranged in the slide groove of the differential adjustment slide rail, the left end of the differential cloth feed shaft is hinged to the differential tooth frame through the differential cloth feed connecting rod, the left end of the differential control rod main shaft protrudes out of the machine base, and a differential adjustment component is arranged at the protruding end.

[0007] In the above interlock sewing machine, the differential adjustment slide rail is also connected to the cloth feed shaft through a third connecting rod and a lifting tooth shaft crank, and the left end of the cloth feed shaft is connected to the cloth feed tooth frame through the cloth feed shaft crank and a small cloth feed connecting rod.

[0008] In the above interlock sewing machine, it also includes: a needle distance adjustment mechanism, the needle distance adjustment mechanism includes a needle distance adjustment spindle arranged parallel to the differential control rod spindle, the needle distance adjustment spindle is respectively connected to the cloth feed shaft and the lower shaft through the cloth feed assembly, the left end of the needle distance adjustment spindle extends out of the machine base, and the needle distance adjustment assembly is arranged at the protruding end.

[0009] In a kind of interlock sewing machine mentioned above, the differential adjustment assembly includes a front feed tooth adjustment rod, which can drive the differential control rod main shaft to rotate. A front feed tooth scale plate is arranged on the left side surface of the machine base. A first arc-shaped hole with the rotation point of the front feed tooth adjustment rod as the center is arranged on the front feed tooth scale plate. The first adjustment knob is connected to the front feed tooth adjustment rod by a screw rod passing through the first arc-shaped hole.

[0010] In the above-mentioned interlock sewing machine, a second arc-shaped hole is arranged on the front feed tooth scale plate, and the second arc-shaped hole is concentric with the first arc-shaped hole. An adjustment scale is arranged on the front feed tooth scale plate near the arc-shaped edge of the second arc-shaped hole, and a scale indicator line aligned with the adjustment scale is arranged at a position corresponding to the second arc-shaped hole on the front feed tooth adjustment rod.

[0011] In the above interlock sewing machine, upper and lower limit blocks are respectively provided at the upper and lower ends of the second arc-shaped hole, and the front feed tooth adjustment rod can move in the area between the upper and lower limit blocks.

[0012] In a flat sewing machine described above, the cloth feeding assembly includes a cloth feeding crank fixed on the cloth feeding shaft, the cloth feeding crank is connected to the first connecting rod pin through a long connecting rod, the first connecting rod pin is connected to the stitch length adjustment spindle through a short connecting rod, a second connecting rod pin, and a differential control frame, the two ends of the differential control frame are respectively fixedly connected to the second connecting rod pin and the stitch length adjustment spindle, and the second connecting rod pin is arranged parallel to the stitch length adjustment spindle; the first connecting rod pin is also connected to a cloth feeding connecting rod, and the cloth feeding connecting rod is connected to the lower shaft through a cloth feeding eccentric wheel.

[0013] In the above-mentioned interlock sewing machine, the stitch length adjustment assembly includes a rear feed tooth adjustment rod, which is connected to the stitch length adjustment spindle and can drive it to rotate, and a rear feed tooth scale plate is arranged on the left side surface of the machine base, and a third arc-shaped hole with the rotation point of the rear feed tooth adjustment rod as the center is arranged on the rear feed tooth scale plate, and the second adjustment knob is connected to the rear feed tooth adjustment rod through a screw rod passing through the third arc-shaped hole.

[0014] In the above-mentioned interlock sewing machine, a fourth arc-shaped hole is arranged on the rear feed tooth scale plate, the fourth arc-shaped hole is concentric with the third arc-shaped hole, an adjustment scale is arranged on the rear feed tooth scale plate near the arc-shaped edge of the fourth arc-shaped hole, and a scale indicator line aligned with the adjustment scale is arranged on the rear feed tooth adjustment rod at a position corresponding to the fourth arc-shaped hole.

[0015] In a flat sewing machine described above, the conversion crank shaft includes a rotating shaft, and a conversion crank is integrally arranged at one end of the rotating shaft. The conversion crank is V-shaped, and the rotating shaft is connected to the inflection point of the conversion crank. One end of the conversion crank is rotationally connected to the first connecting rod, and the other end is rotationally connected to the second connecting rod.

[0016] The outstanding advantages of the utility model compared with the prior art are:

[0017] 1. The utility model arranges the differential adjustment assembly at the left end of the machine base, which is convenient for installing the electromechanical integrated electric control at the right end of the machine base;

[0018] 2. The utility model arranges the differential adjustment component and the needle distance adjustment component on the same side of the machine base, so that the needle distance and the differential amount can be adjusted together or separately, which is convenient to adjust and has a reasonable layout. Description of the drawings:

[0019] Figure 1 It is one of the three-dimensional schematic diagrams of the utility model without a base;

[0020] Figure 2 It is a three-dimensional schematic diagram of the utility model;

[0021] Figure 3 This is the second three-dimensional schematic diagram of the utility model without a base;

[0022] Figure 4 This is the third three-dimensional schematic diagram of the utility model without a base;

[0023] Figure 5 It is a schematic diagram of the conversion crank shaft of the utility model;

[0024] Figure 6 It is a schematic diagram showing that the crank arm of the utility model is located in the slide groove of the differential adjustment slide rail.

[0025] In the figure: 1, lower shaft; 2, differential control rod main shaft; 3, machine base; 4, differential connecting crank; 5, first connecting rod; 6, conversion crank shaft; 6a, rotating shaft; 6b, conversion crank; 7, second connecting rod; 8, differential adjustment slide rail; 9, differential adjustment crank; 9a, crank arm; 10, differential cloth feed shaft; 11, slide groove; 12, differential cloth feed connecting rod; 13, differential tooth rack; 14, differential tooth; 15, third connecting rod; 16, tooth lifting shaft crank; 17, cloth feed shaft; 18, cloth feed shaft crank; 19, cloth feed small connecting rod; 20, cloth feed tooth rack; 21, cloth feed tooth; 2 2. Stitch adjustment spindle; 23. Front feed tooth adjustment rod; 24. Front feed tooth scale plate; 25. First arc hole; 26. First adjustment knob; 27. Second arc hole; 28. Adjustment scale; 29. ​​Scale indicator line; 30. Upper limit block; 31. Lower limit block; 32. Feed crank; 33. Long connecting rod; 34. Short connecting rod; 35. Differential control frame; 36. Feed connecting rod; 37. Feed eccentric wheel; 38. Stitch adjustment baffle; 39. Back feed tooth adjustment rod; 40. Back feed tooth scale plate; 41. Third arc hole; 42. Second adjustment knob; 43. Fourth arc hole. Specific implementation method:

[0026] The present invention is further described below with reference to specific embodiments. Figure 1 —6:

[0027] The utility model provides a stretch sewing machine, which includes: a differential adjustment mechanism, the differential adjustment mechanism includes a differential control rod main shaft 2 arranged in parallel with a lower shaft 1, and the differential control rod main shaft 2 is rotatably arranged on a machine base 3. The differential control rod main shaft 2 is connected to a differential cloth feeding shaft 10 through a differential connecting crank 4, a first connecting rod 5, a conversion crank shaft 6, a second connecting rod 7, a differential adjustment slide rail 8, and a differential adjustment crank 9 which are connected in sequence. A slide groove 11 is arranged on the differential adjustment slide rail 8, one end of the differential adjustment crank 9 is arranged on the differential cloth feeding shaft 10, and a crank arm 9a is arranged on the other end. The crank arm 12 is slidably arranged in the slide groove 11 of the differential adjustment slide rail 8, and the left end of the differential cloth feeding shaft 10 is hinged with a differential tooth frame 13 through a differential cloth feeding connecting rod 12, so as to drive the differential tooth frame 13 to reciprocate independently, and a differential tooth 14 is arranged on the differential tooth frame 13. The left end of the differential control rod main shaft 2 extends out of the left end of the machine base 3, and a differential adjustment component is arranged at the protruding end; the differential adjustment slide rail 8 is also connected to the cloth feed shaft 17 through the third connecting rod 15 and the tooth lifting shaft crank 16, and the left end of the cloth feed shaft 17 is connected to the cloth feed tooth frame 20 through the cloth feed shaft crank 18 and the cloth feed small connecting rod 19, and a cloth feed tooth 21 is arranged on the cloth feed tooth frame 20.

[0028] The utility model sets the differential adjustment component at the left end of the machine base 3, which is convenient for optimizing the design of the sewing machine, such as designing the interlock sewing machine into an integrated machine, compared with the prior art where the differential adjustment component is installed at the right end of the machine base 3. In addition, the utility model changes the installation position of the differential adjustment component and also facilitates the adjustment of the differential amount.

[0029] Furthermore, the interlock sewing machine of the utility model further includes: a needle distance adjustment mechanism, which includes a needle distance adjustment spindle 22 arranged parallel to the differential control rod spindle 2, the needle distance adjustment spindle 22 is respectively connected to the cloth feeding shaft 17 and the lower shaft 1 through the cloth feeding assembly, one end of the needle distance adjustment spindle 22 extends out of the left end of the machine base 3, and a needle distance adjustment assembly is arranged at the extended end. The needle distance adjustment spindle 22 is rotatably arranged on the machine base 3.

[0030] The utility model arranges the differential adjustment component and the needle distance adjustment component on the same side of the machine base 3, so that the needle distance and the differential amount can be adjusted together or separately.

[0031] Furthermore, the conversion crank shaft 6 includes a rotating shaft 6a, at one end of which a conversion crank 6b is integrally arranged, and the conversion crank 6b is V-shaped. The rotating shaft 6a is connected to the inflection point of the conversion crank 6b, and one end of the conversion crank 6b is rotationally connected to the first connecting rod 5, and the other end is rotationally connected to the second connecting rod 7.

[0032] In the utility model, the differential adjustment assembly includes a front feed tooth adjustment rod 23, which can drive the differential control rod main shaft 2 to rotate. A front feed tooth scale plate 24 is arranged on the left side surface of the machine base 3. A first arc hole 25 with the rotation point of the front feed tooth adjustment rod 23 as the center is arranged on the front feed tooth scale plate 24. The first adjustment knob 26 is connected to the front feed tooth adjustment rod 23 by passing through the first arc hole 25 through a screw.

[0033] When adjustment is needed, loosen the first adjustment knob 26 to drive the front tooth adjustment rod 23 to rotate, and the screw rotates in the first arc hole 25. When the required differential amount is adjusted, tighten the first adjustment knob 26 so that no displacement occurs between the front tooth adjustment rod 23 and the front tooth scale plate 24.

[0034] In order to control the accuracy of the rotation angle of the tooth feeding adjustment rod 23, a second arc hole 27 is provided on the front tooth feeding scale plate 24, and the second arc hole 27 is concentric with the first arc hole 25. An adjustment scale 28 is provided on the front tooth feeding scale plate 24 near the arc edge of the second arc hole 27, and a scale indicator line 29 aligned with the adjustment scale 28 is provided on the tooth feeding adjustment rod 23 at a position corresponding to the second arc hole 27.

[0035] In order to limit the rotation angle of the tooth feeding adjustment rod 23, an upper limit block 30 and a lower limit block 31 are respectively provided at the upper and lower ends of the second arc-shaped hole 27, and the tooth feeding adjustment rod 23 can move in the area between the upper limit block 30 and the lower limit block 31.

[0036] Specifically, the upper limit block 30 and the lower limit block 31 are fixed on the front feeding tooth scale plate 24 by screws and gaskets.

[0037] It should be noted that the cloth feeding assembly of the utility model includes a cloth feeding crank 32 fixed on the cloth feeding shaft 17, the cloth feeding crank 32 is connected to the first connecting rod pin through a long connecting rod 33, the first connecting rod pin is connected to the stitch length adjustment spindle 22 through a short connecting rod 34, a second connecting rod pin, and a differential control frame 35; the first connecting rod pin is also connected to a cloth feeding connecting rod 36, and the cloth feeding connecting rod 36 is connected to the lower shaft 1 through a cloth feeding eccentric wheel 37.

[0038] In order to realize the axial limit of the long connecting rod 33, the cloth feeding connecting rod 36 and the differential control frame 35 installed on the first connecting rod pin. The utility model is provided with a needle distance adjustment baffle 38 at one end of the cloth feeding connecting rod 36 provided on the first connecting rod pin. The needle distance adjustment baffle 38 includes a baffle and a shaft, the shaft is fixedly connected to the machine base 3 by screws, and the baffle abuts against the corresponding end face of the first connecting rod pin.

[0039] Similarly, the stitch length adjustment assembly includes a rear feed tooth adjustment rod 39 connected to the stitch length adjustment spindle 22, a rear feed tooth scale plate 40 is provided on the left side of the machine base 3, a third arc hole 41 with the rotation point of the rear feed tooth adjustment rod 39 as the center is provided on the rear feed tooth scale plate 40, and a second adjustment knob 42 is connected to the rear feed tooth adjustment rod 39 through a screw rod passing through the third arc hole 41. When adjusting, the second adjustment knob 42 is loosened, and the second adjustment knob 42 is locked after the adjustment is completed, so that no displacement occurs between the rear feed tooth adjustment rod 39 and the rear feed tooth scale plate 40.

[0040] In order to control the accuracy of the rotation angle of the rear tooth adjustment rod 39, a fourth arc hole 43 is provided on the rear tooth scale plate 40, and the fourth arc hole 43 is concentric with the third arc hole 41. An adjustment scale is provided on the rear tooth scale plate 40 near the arc edge of the fourth arc hole 43, and a scale indicator line aligned with the adjustment scale is provided on the rear tooth adjustment rod 39 at a position corresponding to the fourth arc hole.

[0041] In order to limit the rotation angle of the rear tooth adjustment rod 39, the upper and lower ends of the third arc-shaped hole 41 are respectively provided with limit blocks, and the rear tooth adjustment rod 39 can move in the area between the two limit blocks. The installation structure of the two limit blocks on the rear tooth scale plate 40 is the same as the upper limit block 30 and the lower limit block 31.

[0042] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A flat seam sewing machine, characterized in that: include: A differential adjustment mechanism, the differential adjustment mechanism comprising a differential control rod main shaft (2) arranged in parallel with a lower shaft (1), the differential control rod main shaft (2) being connected to a differential cloth feeding shaft (10) through a differential connecting crank (4), a first connecting rod (5), a conversion crank shaft (6), a second connecting rod (7), a differential adjustment slide rail (8), and a differential adjustment crank (9) which are connected in sequence, a slide groove (11) being arranged on the differential adjustment slide rail (8), one end of the differential adjustment crank (9) being arranged on the differential cloth feeding shaft (10), and a crank arm (9a) being arranged on the other end, the crank arm (9a) being slidably arranged in the slide groove (11) of the differential adjustment slide rail (8), the left end of the differential cloth feeding shaft (10) being hinged to a differential tooth frame (13) through a differential cloth feeding connecting rod (12), the left end of the differential control rod main shaft (2) extending out of a machine base (3), and a differential adjustment component being arranged at the extending end.

2. The interlock sewing machine according to claim 1, characterized in that: The differential adjustment slide rail (8) is also connected to the cloth feed shaft (17) via a third connecting rod (15) and a tooth lifting shaft crank (16); the left end of the cloth feed shaft (17) is connected to the cloth feed tooth frame (20) via a cloth feed shaft crank (18) and a small cloth feed connecting rod (19).

3. The interlock sewing machine according to claim 2, characterized in that: Also includes: The needle distance adjustment mechanism comprises a needle distance adjustment spindle (22) arranged parallel to the differential control lever spindle (2), the needle distance adjustment spindle (22) being connected to the cloth feeding shaft (17) and the lower shaft (1) respectively through a cloth feeding assembly, the left end of the needle distance adjustment spindle (22) extending out of the machine base (3), and the needle distance adjustment assembly being arranged at the extending end.

4. A flat seam sewing machine according to claim 1, 2 or 3, characterized in that: The differential adjustment assembly comprises a front tooth adjustment rod (23), the front tooth adjustment rod (23) can drive the differential control rod main shaft (2) to rotate, a front tooth scale plate (24) is arranged on the left side surface of the machine base (3), a first arc hole (25) with the rotation point of the front tooth adjustment rod (23) as the center is arranged on the front tooth scale plate (24), and a first adjustment knob (26) is connected to the front tooth adjustment rod (23) through a screw rod passing through the first arc hole (25).

5. The interlock sewing machine according to claim 4, characterized in that: The front tooth scale plate (24) is provided with a second arc-shaped hole (27), the second arc-shaped hole (27) is concentric with the first arc-shaped hole (25), an adjustment scale (28) is provided on the front tooth scale plate (24) near the arc-shaped edge of the second arc-shaped hole (27), and a scale indicating line (29) aligned with the adjustment scale (28) is provided on the front tooth adjustment rod (23) at a position corresponding to the second arc-shaped hole (27).

6. The interlock sewing machine according to claim 5, characterized in that: An upper limit block (30) and a lower limit block (31) are respectively arranged at the upper and lower ends of the second arc-shaped hole (27), and the front tooth feeding adjustment rod (23) can move in the area between the upper limit block (30) and the lower limit block (31).

7. The interlock sewing machine according to claim 3, characterized in that: The cloth feeding assembly comprises a cloth feeding crank (32) fixedly mounted on the cloth feeding shaft (17); the cloth feeding crank (32) is connected to a first connecting rod pin via a long connecting rod (33); the first connecting rod pin is connected to a stitch length adjustment spindle (22) via a short connecting rod (34), a second connecting rod pin and a differential control frame (35); two ends of the differential control frame (35) are respectively fixedly connected to the second connecting rod pin and the stitch length adjustment spindle (22); the second connecting rod pin and the stitch length adjustment spindle (22) are arranged in parallel; the first connecting rod pin is also connected to a cloth feeding connecting rod (36); the cloth feeding connecting rod (36) is connected to the lower shaft (1) via a cloth feeding eccentric wheel (37).

8. A flat seam sewing machine according to claim 3 or 7, characterized in that: The stitch length adjustment assembly comprises a rear-feeding tooth adjustment rod (39), which is connected to a stitch length adjustment main shaft (22) and can drive the same to rotate; a rear-feeding tooth scale plate (40) is arranged on the left side surface of the machine base (3); a third arc-shaped hole (41) with a rotation point of the rear-feeding tooth adjustment rod (39) as a circle center is arranged on the rear-feeding tooth scale plate (40); and a second adjustment knob (42) is connected to the rear-feeding tooth adjustment rod (39) through a screw rod passing through the third arc-shaped hole (41).

9. The interlock sewing machine according to claim 8, characterized in that: The rear tooth scale plate (40) is provided with a fourth arc-shaped hole (43), the fourth arc-shaped hole (43) is concentric with the third arc-shaped hole (41), an adjustment scale is provided on the rear tooth scale plate (40) near the arc-shaped edge of the fourth arc-shaped hole (43), and a scale indicator line aligned with the adjustment scale is provided on the rear tooth adjustment rod (39) at a position corresponding to the fourth arc-shaped hole (43).

10. The interlock sewing machine according to claim 1, characterized in that: The conversion crank shaft (6) comprises a rotating shaft (6a), and a conversion crank (6b) is integrally arranged at one end of the rotating shaft (6a). The conversion crank (6b) is V-shaped, and the rotating shaft (6a) is connected to the inflection point of the conversion crank (6b). One end of the conversion crank (6b) is rotationally connected to the first connecting rod, and the other end is rotationally connected to the second connecting rod.

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