Presser foot linkage needle lift device for sewing machine

Abstract

The application relates to a presser foot linkage needle hook lifting device of a sewing machine, which comprises a presser foot mechanism, a needle hook mechanism and a bracket. The presser foot mechanism comprises a presser bar; the needle hook mechanism comprises a rotating shaft component, a rotating arm and a needle hook; the rotating shaft component is arranged in parallel to the presser bar; the two ends of the rotating arm are connected to the rotating shaft component and the needle hook respectively; the end of the needle hook away from the rotating arm can swing back and forth around the presser bar; the bracket is connected to the presser bar and is arranged correspondingly to the rotating arm; when the presser bar is lifted upward, the rotating arm and the needle hook are pushed upward by the bracket to move together. Therefore, the device can be used for processing various different thicknesses of sewing objects and can meet the sewing requirement of special thick sewing objects.

Description

Technical Field

[0001] This application relates to the technical field of a sewing machine, and more particularly to a presser foot-linked hook lifting device for a sewing machine. Background Technology

[0002] The existing three-needle sewing machine has a presser foot device and a hook device. The presser foot device mainly includes a presser bar mechanism and a presser foot plate. The presser bar mechanism passes through the sewing machine body and includes a knob, a spring, a cylindrical tube and a presser bar. The cylindrical tube is connected to the presser bar. The spring is elastically clamped between the knob and the cylindrical tube. The hook device is located on the side of the presser foot device and can only make horizontal reciprocating swings, but cannot make vertical axial movements.

[0003] However, the presser foot and hook devices of existing sewing machines are still not perfect in practical use. Because the lifting of the presser foot plate is restricted by the hook device, it is impossible to sew some thicker or multi-layered fabrics.

[0004] In view of this, the applicant has devoted himself to researching and applying theoretical principles to address the shortcomings of the prior art, and has made every effort to solve the aforementioned problems, which has become the target of the applicant's improvement. Summary of the Invention

[0005] One objective of this application is to provide a presser foot-linked hook lifting device for a sewing machine, which can not only process various types of fabrics of different thicknesses, but also meet the requirements for sewing extra-thick fabrics.

[0006] To achieve the above objectives, this application provides a presser foot-linked hook lifting device for a sewing machine, including a presser foot mechanism, a hook mechanism, and a bracket. The presser foot mechanism includes a presser bar; the hook mechanism includes a rotating shaft component, a rotating arm, and a hook. The rotating shaft component is arranged parallel to the presser bar, and the two ends of the rotating arm are respectively connected to the rotating shaft component and the hook. The end of the hook away from the rotating arm can reciprocate around the presser bar; the bracket is connected to the presser bar and is arranged corresponding to the rotating arm; wherein when the presser bar is lifted upward, the bracket pushes the rotating arm and the hook to move upward together.

[0007] In one embodiment, the hook mechanism includes a hook drive assembly, and the rotating shaft component includes a crankshaft, a driven rotating shaft, and a return spring. One end of the crankshaft is connected to and actuated by the hook drive assembly, the driven rotating shaft passes through the crankshaft, and the return spring is elastically clamped between the crankshaft and the driven rotating shaft. The end of the rotating arm away from the hook is connected to the driven rotating shaft.

[0008] In one embodiment, the crankshaft is provided with a guide groove, and the driven shaft is connected to a column, which is housed in the guide groove, so that the driven shaft can only move axially relative to the crankshaft and cannot rotate relative to it.

[0009] In one embodiment, the driven shaft further includes a rotating sleeve connected to the end of the crankshaft away from the hook drive assembly.

[0010] In one embodiment, the driven shaft further includes a positioning element connected to the side of the rotating sleeve.

[0011] In one embodiment, the positioning member is provided with a groove, and the rotating arm is connected to a slider, which is housed in the groove, so that the rotating arm can only move axially relative to the positioning member and cannot rotate relative to it.

[0012] In one embodiment, the bracket includes a sleeve and an L-shaped plate, the sleeve being connected to a pressure bar, and the L-shaped plate being connected to the sleeve with one end away from the sleeve corresponding to a swivel arm configuration.

[0013] In one embodiment, the bracket further includes a soft pad disposed on the L-shaped plate.

[0014] This application also has the following advantages: by setting up the bracket, the lifting height of the presser foot can be increased while maintaining the same machine structure, thus making it suitable for sewing fabrics of various thicknesses. The addition of a soft pad achieves shock absorption and reduces noise generated during operation. The sliding groove of the positioning member, the slider of the rotating arm, the guide groove of the crankshaft, and the column of the driven shaft guide the movement, ensuring that the rotating arm can only move axially and cannot rotate relative to the others. Attached Figure Description

[0015] Figure 1 The image shows the appearance of the presser foot linkage hook lifting device of the sewing machine as applied to the sewing machine assembly.

[0016] Figure 2 This is an external view of the presser foot linkage hook lifting device assembly of the sewing machine of this application.

[0017] Figure 3 This is another perspective view of the presser foot linkage hook lifting device of the sewing machine of this application.

[0018] Figure 4 This is an exploded view of the presser foot linkage hook lifting device, needle bar assembly, and needle plate of the sewing machine of this application.

[0019] Figure 5 This is an exploded view of the presser foot linkage hook lifting device of the sewing machine of this application.

[0020] Figure 6 This is a diagram showing the usage status of the presser foot-linked hook lifting device of the sewing machine in this application (I).

[0021] Figure 7 for Figure 6 A partial sectional view.

[0022] Figure 8Diagram (II) showing the usage status of the presser foot-linked hook lifting device of the sewing machine in this application.

[0023] Figure 9 for Figure 8 A partial sectional view.

[0024] Explanation of reference numerals in the attached figures:

[0025] 10: Presser foot mechanism;

[0026] 11: Presser foot drive assembly;

[0027] 12: Presser foot module;

[0028] 121: Pressure bar;

[0029] 122: Presser foot plate;

[0030] 20: Hook mechanism;

[0031] 21: Hook drive assembly;

[0032] 22: Rotating shaft component;

[0033] 221: Crankshaft;

[0034] 2211: Guide groove;

[0035] 222: Driven shaft;

[0036] 2221: Column;

[0037] 223: Return spring;

[0038] 224: Rotary sleeve;

[0039] 225: Positioning component;

[0040] 2251: Slide groove;

[0041] 23: Rotary arm;

[0042] 231: Slider;

[0043] 24: Crochet hook;

[0044] 30: Bracket;

[0045] 31: Sleeve;

[0046] 32: L-shaped plate;

[0047] 33: Soft pad;

[0048] 8: Sewing machine;

[0049] 81: Body;

[0050] 82: Needle-and-stick assembly;

[0051] 83: Needle plate. Detailed Implementation

[0052] The detailed description and technical content of this application are explained below with reference to the accompanying drawings. However, the accompanying drawings are provided for reference and illustration only and are not intended to limit this application.

[0053] Please see Figures 1 to 5 As shown, this application provides a presser foot-linked hook lifting device for a sewing machine. The sewing machine 8 has a body 81, a needle bar assembly 82, and a needle plate 83, and other related components or devices. The presser foot-linked hook lifting device mainly includes a presser foot mechanism 10, a hook mechanism 20, and a bracket 30.

[0054] The presser foot mechanism 10 mainly includes a presser foot transmission assembly 11 and a presser foot module 12. The presser foot module 12 mainly includes a presser bar 121 and a presser foot plate 122. The presser bar 121 is erected on the aforementioned machine body 81 through a bushing. The presser foot plate 122 is connected to the presser bar 121 and is located on the aforementioned needle plate 83. The upper end of the presser bar 121 is connected to the presser foot transmission assembly 11 and is actuated by the presser foot transmission assembly 11. Since it belongs to the prior art, it will not be described in detail.

[0055] The hook mechanism 20 mainly includes a hook transmission assembly 21, a rotating shaft component 22, a rotating arm 23, and a hook 24. The rotating shaft component 22 is erected on the aforementioned body 81 via a bushing and is arranged parallel to the aforementioned pressure bar 121. One end of the rotating shaft component 22 is connected to and actuated by the hook transmission assembly 21. The two ends of the rotating arm 23 are respectively connected to the rotating shaft component 22 and the hook 24. The end of the hook 24 away from the rotating arm 23 can reciprocate horizontally around the pressure bar 121. This hook 24 is used to interweave the upper thread with the needle threads of the needle bar assembly 82. The hook 24 is generally also called an upper hook or upper fork. The hook transmission assembly 21 is prior art and will not be described in detail.

[0056] The bracket 30 is connected to the aforementioned pressure bar 121 and is configured corresponding to the rotating arm 23 for lifting the rotating arm 23.

[0057] In one embodiment, the rotating shaft component 22 mainly includes a crankshaft 221, a driven rotating shaft 222, and a return spring 223. One end of the crankshaft 221 is connected to and actuated by the hook transmission assembly 21. The driven rotating shaft 222 passes through the crankshaft 221. The return spring 223 is elastically clamped between the crankshaft 221 and the driven rotating shaft 222. The end of the rotating arm 23 away from the hook 24 is connected to the driven rotating shaft 222.

[0058] In one embodiment, the crankshaft 221 is provided with a guide groove 2211, and the driven shaft 222 is connected to a column 2221. The column 2221 is accommodated in the guide groove 2211, so that the driven shaft 222 can only move axially relative to the crankshaft 221 and cannot rotate relative to it.

[0059] In one embodiment, the rotating shaft component 22 further includes a rotating sleeve 224 connected to the end of the crankshaft 221 away from the hook drive assembly 21, thereby positioning the crankshaft 221 axially.

[0060] In one embodiment, the rotating shaft component 22 further includes a positioning member 225, which is connected to the side of the rotating sleeve 224 so as to rotate with the rotating sleeve 224.

[0061] In one embodiment, the positioning member 225 is provided with a groove 2251, and the rotating arm 23 is connected to a slider 231. The slider 231 is accommodated in the groove 2251, so that the rotating arm 23 can only move axially relative to the positioning member 225 and cannot rotate relative to it.

[0062] In one embodiment, the bracket 30 mainly includes a sleeve 31 and an L-shaped plate 32. The sleeve 31 is connected to the aforementioned pressure bar 121, and the L-shaped plate 32 is connected to the side of the sleeve 31. The end of the L-shaped plate 32 away from the sleeve 31 is configured corresponding to the aforementioned rotating arm 23.

[0063] In one embodiment, the bracket 30 further includes a soft pad 33 disposed on the L-shaped plate 32 to achieve shock absorption and reduce noise generated during operation.

[0064] Please see Figures 6 to 9 As shown, during use, the fabric to be sewn is held between the presser foot 122 and the needle plate 83. The sewing process is achieved through the feeding teeth moving the fabric and the interlacing of the needle bar assembly 82 and the hook 24. Figure 6 and Figure 7 As shown), after the aforementioned sewing process is completed, the presser foot 121 is raised upwards. When the presser foot 121 rises to a specific height, the soft pad 33 of the bracket 30 pushes the lower end face of the driven shaft 222 and the rotating arm 23 upwards, thereby causing the rotating arm 23 and the hook 24 to move upwards together. At this time, the block 231 will move along the groove 2251 of the positioning member 225, and at the same time, the column 2221 of the driven shaft 222 also moves along the guide groove 2211 of the crankshaft 221. In this way, the maximum fabric-accommodating space can be formed between the presser foot plate 122 and the needle plate 83 (e.g., Figure 8 and Figure 9 (As shown).

[0065] The above description is only a preferred embodiment of this application and is not intended to limit the patent scope of this application. Other equivalent changes that utilize the patent spirit of this application should all fall within the patent scope of this application.

Claims

1. A presser foot-linked hook lifting device for a sewing machine, characterized in that, include: Presser foot mechanism, including presser bar; A hook mechanism includes a rotating shaft component, a rotating arm, and a hook. The rotating shaft component is arranged parallel to the pressure bar. The two ends of the rotating arm are respectively connected to the rotating shaft component and the hook. The end of the hook away from the rotating arm can reciprocate around the pressure bar. The bracket connects to the pressure bar and is configured corresponding to the rotary arm; When the pressure bar is raised, the bracket pushes the rotating arm and the hook upward together.

2. The presser foot-linked hook lifting device for a sewing machine as described in claim 1, characterized in that, The hook mechanism includes a hook transmission assembly, and the rotating shaft component includes a crankshaft, a driven rotating shaft, and a return spring. One end of the crankshaft is connected to and actuated by the hook transmission assembly. The driven rotating shaft passes through the crankshaft. The return spring is elastically clamped between the crankshaft and the driven rotating shaft. The end of the rotating arm away from the hook is connected to the driven rotating shaft.

3. The presser foot-linked hook lifting device for a sewing machine as described in claim 2, characterized in that, The crankshaft is provided with a guide groove, and the driven shaft is connected to a column. The column is housed in the guide groove, so that the driven shaft can only move axially relative to the crankshaft and cannot rotate relative to it.

4. The presser foot-linked hook lifting device for a sewing machine as described in claim 2, characterized in that, The driven shaft also includes a rotating sleeve connected to the end of the crankshaft away from the hook drive assembly.

5. The presser foot-linked hook lifting device for a sewing machine as described in claim 4, characterized in that, The driven shaft also includes a positioning element, which is connected to the side of the rotating sleeve.

6. The presser foot-linked hook lifting device for a sewing machine as described in claim 5, characterized in that, The positioning element is provided with a sliding groove, and the rotating arm is connected to a slider. The slider is housed in the sliding groove, so that the rotating arm can only move axially relative to the positioning element and cannot rotate relative to it.

7. The presser foot-linked hook lifting device for a sewing machine as described in claim 1, characterized in that, The bracket includes a sleeve and an L-shaped plate. The sleeve is connected to the pressure bar, and the L-shaped plate is connected to the sleeve, with one end of the L-shaped plate away from the sleeve corresponding to the swivel arm configuration.

8. The presser foot-linked hook lifting device for a sewing machine as described in claim 7, characterized in that, The bracket also includes a soft pad, which is disposed on the L-shaped plate.

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