Presser foot pressure adjusting device of sewing machine

Abstract

The utility model relates to a presser foot pressure adjusting device of a sewing machine, the sewing machine is provided with a machine body, the presser foot pressure adjusting device comprises a driving module and a presser foot mechanism, the driving module is fixed on the machine body and comprises a driver, an adjusting rod and an elastic body, the driver is provided with a driving screw, and the adjusting rod is connected with the driving screw and is driven by the driving screw to generate displacement; the elastic body sleeves one end, far away from the guide screw, of the adjusting rod; the presser foot mechanism comprises a presser foot pull rod and a presser foot arm, the presser foot pull rod movably penetrates through the machine body and clamps the elastic body between the adjusting rod and the presser foot pull rod, one end of the presser foot arm is pivoted with the machine body, and the other end of the presser foot arm is connected with the presser foot pull rod; wherein the guide screw, the adjusting rod, the elastic body and the presser foot pull rod are located on the same center line. Therefore, the acting force applied to the sewing cloth by the presser foot mechanism can be intuitively calculated and properly applied.

Description

Technical Field

[0001] The present application relates to the technical field of a sewing machine, and in particular to a presser foot pressure adjusting device of a sewing machine. Background Art

[0002] The overlock sewing machine in the sewing machine is mainly used for the overlock sewing of textiles and has a wide range of applications in the sewing field. The existing overlock sewing machine's presser foot pressure adjustment structure usually uses the elastic force of the compression spring to adapt to the lifting and lowering of the presser foot, generating pressure so that the presser foot can press the sewing cloth tightly to facilitate sewing. Since the elastic force of the compression spring is different when it is extended or shortened, when the sewing fabric changes from thin to thick, or there is a bone (or stem seam), the pressure of the presser foot increases, resulting in uneven passage of the sewing fabric, often causing jamming, which causes the sewing machine to have problems such as thread blockage, fabric wrinkles or uneven stitches.

[0003] Therefore, how to overcome the aforementioned sewing quality problems such as jamming, thread blocking, fabric wrinkles or uneven stitches is a technical issue that the applicant needs to solve. Utility Model Content

[0004] One purpose of the present application is to provide a presser foot pressure adjustment device for a sewing machine, wherein the force applied by the presser foot mechanism to the sewing cloth can be more intuitively calculated and properly applied.

[0005] In order to achieve the above-mentioned purpose, the present application provides a presser foot pressure adjustment device for a sewing machine, the sewing machine has a body, the presser foot pressure adjustment device includes a driving module and a presser foot mechanism, the driving module is fixed to the body, the driving module includes a driver, an adjustment rod and an elastic body, the driver has a lead screw, the adjustment rod is connected to the lead screw and is driven by the lead screw to generate displacement, the elastic body is sleeved on one end of the adjustment rod away from the lead screw; the presser foot mechanism includes a presser foot pull rod and a presser foot arm, the presser foot pull rod is movably connected to the body and clamps the elastic body between the adjustment rod and the presser foot pull rod, one end of the presser foot arm is pivotally connected to the body, and the other end of the presser foot arm is connected to the presser foot pull rod; wherein the lead screw, the adjustment rod, the elastic body and the presser foot pull rod are located on the same center line.

[0006] The present application also has the following effects: by means of modular design, assembly or disassembly becomes simpler and easier during assembly or maintenance. By means of the setting of the anti-leakage structure, the lubricating oil inside the machine body will not leak out and contaminate the sewing cloth. The fabrics of different thicknesses or large suture joints can pass smoothly without uneven stitches or wrinkles. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1The presser foot pressure adjustment device of the sewing machine of the present application is combined with the appearance diagram of the sewing machine.

[0008] Figure 2 This is a schematic diagram of the assembly of the presser foot pressure adjustment device of the sewing machine of the present application.

[0009] Figure 3 for Figure 2 Another perspective of .

[0010] Figure 4 This is an exploded view of the presser foot pressure adjustment device of the sewing machine of the present application.

[0011] Figure 5 This is a sectional view (I) of the presser foot pressure adjustment device of the sewing machine of the present application in the usage state.

[0012] Figure 6 This is a sectional view (II) of the presser foot pressure adjustment device of the sewing machine of the present application in the usage state.

[0013] Description of reference numerals:

[0014] 1: Presser foot pressure adjustment device;

[0015] 10: drive module;

[0016] 11: Driver;

[0017] 111: lead screw;

[0018] 112: nut;

[0019] 12: Adjustment rod;

[0020] 121: end;

[0021] 1211: limit pin;

[0022] 122: first rod body;

[0023] 123: second rod body;

[0024] 13: elastomer;

[0025] 14: Motor seat;

[0026] 20: presser foot mechanism;

[0027] 21: presser foot pull rod;

[0028] 22: presser foot arm;

[0029] 23: presser foot;

[0030] 24: rotating member;

[0031] 25: Linked arm;

[0032] 26: Hook stripe;

[0033] 27: pull rod;

[0034] 30: position sensing mechanism;

[0035] 31: position sensor;

[0036] 32: sensing pin;

[0037] 40: Anti-oil leakage structure;

[0038] 41: fixed sleeve;

[0039] 411: first guide groove;

[0040] 412: second guide groove;

[0041] 42: casing;

[0042] 43: bushing;

[0043] L: center line;

[0044] 8: Sewing machine;

[0045] 81: body;

[0046] 82: Needle plate. DETAILED DESCRIPTION

[0047] The detailed description and technical contents of the present application are described as follows in conjunction with the accompanying drawings. However, the attached drawings are only provided for reference and explanation and are not intended to limit the present application.

[0048] See also Figures 1 to 4 As shown, the present application provides a presser foot pressure adjustment device for a sewing machine, which is installed on a sewing machine 8. The sewing machine 8 has a body 81, a needle plate 82 and other related components and / or devices. The needle plate 82 is fixed on the body 81. The structure of this part is the prior art, so it will not be described in detail one by one.

[0049] The presser foot pressure adjustment device 1 of the present application mainly includes a driving module 10 and a presser foot mechanism 20 .

[0050] The driving module 10 is fixed to the aforementioned body 81, and mainly includes a driver 11, an adjustment rod 12 and an elastic body 13. The driver 11 is a linear stepping motor, which has a lead screw 111 and a nut 112 (such as Figure 5 As shown), the nut 112 is connected to the rotor (not shown), so that the rotation of the rotor drives the nut 112 to rotate, and the lead screw 111 is a non-self-locking lead screw, which can drive the lead screw 111 to move linearly during the rotation of the nut 112.

[0051] The adjusting rod 12 is connected to the lead screw 111 and is driven by the lead screw 111 to generate displacement. The adjusting rod 12 mainly includes an end 121, a first rod body 122 and a second rod body 123. The lead screw 111 is fixed to the end 121 by a nut. A stop pin 1211 (such as Figure 5 The first rod 122 extends from one end of the end 121, and the second rod 123 extends from one end of the first rod 122, wherein the diameter of the first rod 122 is greater than the diameter of the second rod 123. The elastic body 13 is sleeved on the outer periphery of the second rod 123.

[0052] The presser foot mechanism 20 mainly includes a presser foot rod 21, a presser foot arm 22 and a presser foot plate 23. The presser foot rod 21 is movably connected to the body 81, and the elastic body 13 is elastically clamped between the first rod body 122 of the adjustment rod 12 and the presser foot rod 21. One end of the presser foot arm 22 is pivotally connected to the body 81, and the other end of the presser foot arm 22 is connected to the presser foot rod 21. The presser foot plate 23 is connected to the presser foot arm 22 and corresponds to the above-mentioned needle plate 82.

[0053] The lead screw 111, the adjustment rod 12, the elastic body 13 and the presser foot pull rod 21 are located on the same center line L (eg Figure 5 and Figure 6 shown).

[0054] Specifically, the lead screw 111 , the adjustment rod 12 , the elastic body 13 and the presser foot pull rod 21 are arranged in a straight line for movement.

[0055] To further explain, the lead screw 111 and the adjustment rod 12 can only move linearly but not rotate due to the restriction of the limit pin 1211, while the elastic body 13 has a certain linear ratio according to the force change generated by its deformation. Therefore, the displacement change is calculated by using the lead of the lead screw 111, and the pressure change is realized in combination with the linear ratio of the elastic body 13; in this way, the pressure value change can be calculated more intuitively and used appropriately.

[0056] In one embodiment, the presser foot mechanism 20 also includes a rotating member 24, a connecting arm 25, a hook bar 26 and a pull rod 27, wherein the presser foot arm 22 is connected to the rotating member 24 and is pivotally connected to the body 81 through the rotating member 24, the connecting arm 25 is connected to one end of the rotating member 24 away from the presser foot arm 22, one end of the pull rod 27 is pivotally connected to the body 81, and the two ends of the hook bar 26 are respectively hooked between the connecting arm 25 and the pull rod 27.

[0057] In one embodiment, the presser foot pressure adjustment device 1 of the present application further includes a position sensing mechanism 30, the driving module 10 further includes a motor seat 14, the driver 11 is fixed to the aforementioned body 81 through the motor seat 14, the position sensing mechanism 30 mainly includes a position sensor 31 and a sensing pin 32, the position sensor 31 is fixed to the motor seat 14 and electrically connected to the driver 11, wherein the position sensor 31 can be electrically connected to the driver 11 through a processor, a microcontroller (MCU) or other related equipment or devices, wherein the electrical connection can be through a conductive wire or an internal circuit, etc., all of which are covered by the present application. The sensing pin 32 is fixed to the side of the end 121 of the aforementioned adjustment rod 12 and is configured corresponding to the position sensor 31.

[0058] In one embodiment, the presser foot pressure adjustment device 1 of the present application also includes an anti-oil leakage structure 40, which is sleeved on the outside of the adjustment rod 12 and the elastomer 13, and the anti-oil leakage structure 40 mainly includes a fixed sleeve 41, a sleeve 42 and a bushing 43, and the two ends of the sleeve 42 are respectively sealed and connected to the fixed sleeve 41 and the bushing 43, and the fixed sleeve 41 and the bushing 43 are fixed to the aforementioned body 81; wherein the aforementioned presser foot pull rod 21 is connected to the aforementioned body 81 through the bushing 43.

[0059] In one embodiment, the fixing sleeve 41 is provided with a first guide groove 411 (such as Figure 5 As shown) and the second guide groove 412, the first guide groove 411 is for the aforementioned limit pin 1211 to pass through, and the second guide groove 412 is for the aforementioned sensing pin 32 to pass through, so that it can be used to limit the adjustment rod 12 to only be able to make linear displacement in the up and down directions.

[0060] See also Figure 5 and Figure 6 As shown, when in use, the sensing pin 32 can be set as the origin when it is aligned with the position sensor 31. At this time, the adjustment rod 12 has not yet caused the elastic body 13 to generate pre-compression action (such as Figure 5 As shown in the figure, when the lead screw 111 drives the adjustment rod 12 to move downward to the position set by the program, the elastic body 13 is pressed by the adjustment rod 12, so that the position moves and a preliminary pressure is applied to the presser foot arm 22. This phenomenon can be regarded as the spring preload effect. When the presser foot 23 needs to apply a certain pressure to the sewing cloth (or fabric) to prevent the sewing cloth from wrinkling or uneven stitches during the sewing process, but because the sewing cloth (or fabric) is of different thickness or passes through a larger suture bone, it is necessary to adjust the lead screw 111 and the adjustment rod 12 to adjust the pressure applied by the presser foot 23 on the sewing cloth (or fabric) in a timely manner.

[0061] In addition, the presser foot pressure adjustment device 1 of the present application can achieve the required pressure of the presser foot 23 by setting the compression amount of the elastic body 13 by the system according to the linear proportional conversion output force, and can clearly display the pressure value on the display screen, so that sewing technicians can clearly know the most suitable data and achieve the standard basis required for mass production.

[0062] The above description is only a preferred embodiment of the present application and is not intended to limit the patent scope of the present application. Other equivalent changes that apply the patent spirit of the present application should all fall within the patent scope of the present application.

Claims

1. A presser foot pressure adjustment device for a sewing machine, the sewing machine having a body, the presser foot pressure adjustment device comprising: A driving module is fixed to the machine body, the driving module comprises a driver, an adjusting rod and an elastic body, the driver has a lead screw, the adjusting rod is connected to the lead screw and is driven by the lead screw to generate displacement, and the elastic body is sleeved on an end of the adjusting rod away from the lead screw; and The presser foot mechanism comprises a presser foot pull rod and a presser foot arm, wherein the presser foot pull rod is movably connected to the machine body and clamps the elastic body between the adjustment rod and the presser foot pull rod, one end of the presser foot arm is pivotally connected to the machine body, and the other end of the presser foot arm is connected to the presser foot pull rod; The lead screw, the adjusting rod, the elastic body and the presser foot pull rod are located on the same center line.

2. The presser foot pressure adjustment device for a sewing machine as described in claim 1, wherein the lead screw, the adjustment rod, the elastic body and the presser foot pull rod are arranged in a straight line for movement.

3. The presser foot pressure adjustment device of a sewing machine as described in claim 1, further comprising a position sensing mechanism, the driving module further comprising a motor seat, the driver being fixed to the machine body through the motor seat, the position sensing mechanism comprising a position sensor and a sensing pin, the position sensor being fixed to the motor seat and electrically connected to the driver, the sensing pin being fixed to the adjustment rod and corresponding to the position sensor configuration.

4. The presser foot pressure adjustment device for a sewing machine as described in claim 1, further comprising an oil leakage prevention structure, wherein the oil leakage prevention structure is sleeved on the outside of the adjustment rod and the elastic body.

5. The presser foot pressure adjustment device of a sewing machine as described in claim 4, wherein the anti-oil leakage structure includes a fixed sleeve, a sleeve and a bushing, the two ends of the sleeve are respectively sealed and connected to the fixed sleeve and the bushing, and the fixed sleeve and the bushing are fixed to the machine body.

6. The presser foot pressure adjustment device of a sewing machine as described in claim 5, wherein the presser foot pull rod is connected to the machine body through the bushing.

7. The presser foot pressure adjustment device of a sewing machine as described in claim 5 further includes a position sensing mechanism, the position sensing mechanism includes a sensing pin, the adjustment rod is provided with a limit pin, the fixed sleeve is provided with a first guide groove and a second guide groove, the first guide groove is for the limit pin to pass through, and the second guide groove is for the sensing pin to pass through.

8. The presser foot pressure adjustment device of a sewing machine as described in claim 1, wherein the adjustment rod includes an end, a first rod body and a second rod body, the lead screw is fixed to the end, the first rod body extends from one end of the end, the second rod body extends from one end of the first rod body, the diameter of the first rod body is larger than the diameter of the second rod body, and the elastic body is sleeved on the outer periphery of the second rod body.

9. The presser foot pressure adjusting device for a sewing machine as claimed in claim 1, wherein the driver further comprises a nut, and the lead screw is linearly moved by the rotation of the nut.

10. The presser foot pressure adjustment device of a sewing machine as described in claim 1, wherein the presser foot mechanism also includes a presser foot plate, a rotating member, a connecting arm, a hook and a pull rod, the presser foot plate is connected to the presser foot arm, the presser foot arm is connected to the rotating member and is pivotally connected to the machine body through the rotating member, the connecting arm is connected to one end of the rotating member away from the presser foot arm, one end of the pull rod is pivotally connected to the machine body, and the two ends of the hook are respectively hooked between the connecting arm and the pull rod.

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