Adjusting structure and adjusting method of sewing machine presser foot

Abstract

This invention provides an adjustment structure and method for a sewing machine presser foot, which allows for easy adjustment of the height direction and rotation direction of the presser foot and enables disassembly and assembly of the presser foot. In this adjustment structure and method, a joint (2) is provided between the presser bar (3) and the presser foot (4) to adjust the height direction and rotation direction of the presser foot.

Description

Technical Field

[0001] This invention relates to an adjustment structure and method for a sewing machine presser foot that allows for free adjustment of the height and rotation direction relative to the presser bar, and enables one-touch assembly and disassembly of the presser foot relative to the presser bar. Background Technology

[0002] In existing technology, whenever the presser foot of a sewing machine is changed, the height and rotation direction are adjusted using the presser bar itself. Therefore, whenever the presser foot is changed, the presser bar itself (by releasing and re-fixing it) is required to adjust the height and rotation direction.

[0003] In addition, when changing the presser foot relative to the presser bar, the presser foot is detached from the presser bar each time using the fastening screw. Therefore, the fastening screw must be loosened or tightened during the detachment of the presser bar and the presser foot.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2000-233088 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In existing technology, as mentioned earlier, it is generally known that whenever the presser foot of a sewing machine is changed, the height and rotation direction must be adjusted using the presser lever itself. This adjustment of the presser foot's height and rotation direction using the presser lever itself must be done after opening the sewing machine cover, and fine adjustments are difficult and tedious.

[0009] Furthermore, it was revealed that the assembly and disassembly of the sewing machine presser foot are performed by tightening and loosening a screw component. This screw component can sometimes loosen due to vibrations when the sewing machine is in motion. In addition, when it is tightened too forcefully, special tools such as screwdrivers are sometimes required to loosen it, making the operation very cumbersome.

[0010] Therefore, the object of the present invention is to provide an adjustment structure and adjustment method that allows for easy adjustment (especially fine adjustment) of the height direction and rotation direction of the sewing machine presser foot, and enables one-touch assembly and disassembly of the sewing machine presser foot.

[0011] means for solving problems

[0012] Therefore, in order to solve the above problems, the inventors have solved the above problems through the invention of the following technical solution: an adjustment structure for a sewing machine presser foot, wherein the adjustment structure for the sewing machine presser foot has a joint between the presser bar and the sewing machine presser foot that can adjust the sewing machine presser foot in the height direction.

[0013] The above-mentioned problem is solved by the invention of the second technical solution as follows: the adjustment structure of the sewing machine presser foot according to the first technical solution is characterized in that the joint can adjust the rotation direction of the sewing machine presser foot.

[0014] The above-mentioned problem is solved by the invention of the following technical solution three: the sewing machine presser foot adjustment structure according to technical solution one or two is characterized in that the sewing machine presser foot adjustment structure has a fixing part that fixes the presser foot after adjusting the height direction and / or rotation direction using the joint part.

[0015] The above-mentioned problems are solved by the invention of the fourth technical solution as follows: According to the adjustment structure of the sewing machine presser foot as described in the first technical solution, the joint part has a sewing machine presser foot joint part and a presser bar joint part. The sewing machine presser foot joint part is for mounting the sewing machine presser foot. The presser bar joint part is for mounting the sewing machine presser foot joint part in a manner that allows the sewing machine presser foot joint part to be adjusted along the height direction. The presser bar joint part is mounted on the presser bar.

[0016] The above-mentioned problems are solved by the invention of the fifth technical solution as follows: the sewing machine presser foot adjustment structure according to the fourth technical solution is characterized in that the sewing machine presser foot joint can be adjusted to rotate relative to the presser bar joint.

[0017] The above-mentioned problem is solved by the invention of the following technical solution six: the sewing machine presser foot adjustment structure according to technical solution four or five is characterized in that either the sewing machine presser foot joint part or the presser bar joint part has an external thread part, and the other has an internal thread part, and the sewing machine presser foot joint part and the presser bar joint part are screwed together.

[0018] The above-mentioned problem is solved by the invention of the seventh technical solution as follows: The sewing machine presser foot adjustment structure according to any one of technical solutions four to six is ​​characterized in that the sewing machine presser foot adjustment structure has a fixing part that fixes the sewing machine presser foot joint part to the presser bar joint part after the height direction and / or rotation direction of the sewing machine presser foot joint part is adjusted relative to the presser bar joint part.

[0019] The above-mentioned problem is solved by the invention of the following technical solution eight: The adjustment structure of the sewing machine presser foot according to any one of technical solutions one to three is characterized in that the joint and the presser bar have an installation structure that enables the joint and the presser bar to be installed together in a detachable manner.

[0020] The above-mentioned problem is solved by the invention of the following technical solution nine: The sewing machine presser foot adjustment structure according to any one of technical solutions four to seven is characterized in that the presser bar joint and the presser bar have an installation structure that allows the presser bar joint and the presser bar to be installed together in a detachable manner.

[0021] The above-mentioned problems are solved by the invention of the following technical solution ten: a method for adjusting a sewing machine presser foot, characterized in that the method includes the steps of installing the sewing machine presser foot and the connector together, installing the connector together with the presser bar, and adjusting the height direction and rotation direction of the sewing machine presser foot using the connector.

[0022] Invention Effects

[0023] This invention has the following significant effects: it provides an adjustment structure and method that allows for easy adjustment of the height and rotation direction of the sewing machine presser foot and enables one-touch assembly and disassembly of the presser foot. Attached Figure Description

[0024] Figure 1 This is an exploded perspective view of the overall structure of the sewing machine presser foot adjustment mechanism of the present invention.

[0025] Figure 2 It is a 3D view of the sewing machine presser foot and the presser foot joint.

[0026] Figure 3 It is a three-dimensional view of the presser foot and joint of a sewing machine, namely the presser foot joint and the presser bar joint.

[0027] Figure 4 It is a 3D view of the sewing machine presser foot, joint, and presser bar.

[0028] Figure 5 This is a perspective view of the overall structure of the sewing machine presser foot adjustment mechanism of the present invention. Figure 5 This involves loosening the temporarily fastened fixing part 7 (which acts as a nut), rotating the sewing machine presser foot joint part 5 to adjust the height, fine-tuning the rotation direction to adjust the orientation, and then finally tightening the nut. The height is adjusted in units of half the pitch of the internal thread part 13 and the external thread part 14.

[0029] Figure 6This is a diagram showing the steps for installing and adjusting the components of the sewing machine presser foot adjustment structure of the present invention.

[0030] Figure 7 This is a more detailed step diagram showing the installation and adjustment of each component of the sewing machine presser foot adjustment structure of the present invention.

[0031] Explanation of reference numerals in the attached figures

[0032] 1. Adjustment mechanism of sewing machine presser foot

[0033] 2 Connector

[0034] 3 pressure bars

[0035] 4 Sewing machine presser feet

[0036] 5. Sewing machine presser foot joint

[0037] 6. Pressure bar joint

[0038] 7 Fixing part

[0039] 8 Installation Structure

[0040] 9 mounting slots

[0041] 10 chimeric part

[0042] 11 screws

[0043] Unit 12

[0044] 13 Internal thread engagement part

[0045] 14 External thread engagement part

[0046] Unit 15

[0047] 16 Hollow Section

[0048] 17 Thin-walled section

[0049] 18 ball bores

[0050] 19 ball bearings

[0051] 20 leaf spring section

[0052] 21 Leaf Spring Hole

[0053] 22 Incision site

[0054] 23 protrusions

[0055] 24. Stop rotation section

[0056] 25 card combination section Detailed Implementation

[0057] Figure 1This is an exploded perspective view of the overall structure 1 for adjusting the presser foot of the sewing machine according to the present invention. Hereinafter, refer to... Figure 1 The adjustment structure 1 of the sewing machine presser foot is explained.

[0058] The sewing machine presser foot adjustment structure 1 has a connector 2 sandwiched between the presser bar 3 and the sewing machine presser foot 4, which can adjust the height and rotation direction of the sewing machine presser foot 4.

[0059] The connector 2 consists of two components: a sewing machine presser foot connector 5 and a presser bar connector 6. The sewing machine presser foot connector 5 is installed on the sewing machine presser foot 4. The presser bar connector 6 is installed on the sewing machine presser foot connector 5 in a manner that allows adjustment of the height and rotational orientation of the sewing machine presser foot connector 5. The presser bar connector 6 is installed on the opposite side of the installation direction to the sewing machine presser foot connector 5 via the mounting structure 8.

[0060] Details regarding the structure and installation method of the presser foot joint 5 and the presser bar joint 6 of the sewing machine are described later.

[0061] exist Figure 2 The document describes the installation method between the sewing machine presser foot 4 and the sewing machine presser foot connector 5. A groove-shaped mounting groove 9 is formed in the sewing machine presser foot 4. By inserting the fitting portion 10 formed in the sewing machine presser foot connector 5 into the mounting groove 9 and tightening the screws 11 provided in the fitting portion 10, the sewing machine presser foot 4 and the sewing machine presser foot connector 5 are fixed together to form an integrated unit 12.

[0062] The effect of this structure is that even low-precision sewing machine presser feet 4, such as all types of sewing machine presser feet 4 or mounting slots 9, can be fixed to the presser bar 3 without wobbling and with extreme stability.

[0063] Furthermore, although the description describes a configuration where the mounting groove 9 is formed on the sewing machine presser foot 4 and the fitting part 10 and screw 11 are formed on the sewing machine presser foot joint part 5, it is also possible for the mounting groove 9 to be formed on the sewing machine presser foot joint part 5 and the fitting part 10 and screw 11 to be formed on the sewing machine presser foot 4. Moreover, the fixing between the sewing machine presser foot 4 and the sewing machine presser foot joint part 5 is not limited to a structure using screw 11 for fixing; all fixing methods, such as cap-type fixing, concave-convex fitting, and one-touch mounting methods, can be used.

[0064] exist Figure 3 The document describes an installation method in which the presser bar connector 6 is installed on a unit 12 that integrates the sewing machine presser foot 4 and the sewing machine presser foot connector 5.

[0065] An internally threaded engagement portion 13 is formed on the surface (upper surface side) of the presser foot joint portion 5 opposite to the fitting portion 10, and this internally threaded engagement portion 13 has an internal thread. An externally threaded engagement portion 14 is formed on the presser foot joint portion 6, which engages with the internally threaded engagement portion 13. Furthermore, a fixing portion 7, acting as a nut, engages with the externally threaded engagement portion 14. Here, the length of the externally threaded engagement portion 14 in the height direction is such that even when the fixing portion 7 is engaged, the externally threaded portion of the externally threaded engagement portion 14 protrudes. The reason for this protruding length of the externally threaded engagement portion 14 is that the height direction and rotation direction of the presser foot 4 of the sewing machine according to the present invention are adjusted by the depth and angle (in other words, the number of rotations) of the engagement between the internally threaded engagement portion 13 and the externally threaded engagement portion 14.

[0066] The fixing part 7 is formed by a nut. After the internal thread engagement part 13 and the external thread engagement part 14 are engaged by a predetermined amount, the fixing part 7 is rotated toward the side of the sewing machine presser foot joint part 5 that has the internal thread engagement part 13 (excluding the internal thread engagement part 13). This generates friction between the lower surface of the nut on the fixing part 7 and the surface of the sewing machine presser foot joint part 5 that has the internal thread engagement part 13 (excluding the internal thread engagement part 13), making it difficult or impossible for the fixing part 7 to rotate, thereby fixing the unit 12 and the presser bar joint part 6 together. This state is set as the fully fixed state (formally tightened state).

[0067] When temporarily fixing unit 12 or sewing machine presser foot joint 5 to presser bar joint 6, the internal thread engagement part 13 and the external thread engagement part 14 are engaged only by a predetermined amount, thereby temporarily fixing unit 12 to presser bar joint 6. Alternatively, after engaging internal thread engagement part 13 and external thread engagement part 14 by a predetermined amount, the fixing part 7 is rotated toward the side of sewing machine presser foot joint 5 where the internal thread engagement part 13 is formed (excluding the internal thread engagement part 13) until a predetermined frictional force is generated between the lower surface of the nut serving as fixing part 7 and the surface of sewing machine presser foot joint 5 where the internal thread engagement part 13 is formed (excluding the internal thread engagement part 13) and the fixing part 7 can still rotate, thereby temporarily fixing unit 12 to presser bar joint 6.

[0068] Furthermore, the description describes a configuration where an internal thread engagement portion 13 is formed in the presser foot joint 5, an external thread engagement portion 14 is formed in the presser bar joint 6, and a fixing portion 7 is provided. However, it is also possible to have an internal thread engagement portion 13 formed in the presser bar joint 6, an external thread engagement portion 14 formed in the presser foot joint 5, and a fixing portion 7 provided. Moreover, the configuration is not limited to a structure where an internal thread engagement portion 13 is formed in the presser foot joint 5, an external thread engagement portion 14 is formed in the presser bar joint 6, and a fixing portion is provided. Any structure is acceptable as long as the presser foot joint 5 can be adjusted relative to the presser bar joint 6 in terms of height and rotation direction, and after adjustment, the presser foot joint 5 and the presser bar joint 6 can be fixed and / or temporarily fixed.

[0069] exist Figure 4 (Also refer to) Figure 1 The document describes a method for mounting a unit 15, which integrates the sewing machine presser foot 4, the sewing machine presser foot joint 5, and the presser bar joint 6, onto the mounting structure 8 of the presser bar 3.

[0070] On the lower surface side of the pressure rod 3 (on one side of the mounting unit 15), a cylindrical hollow portion 16 is formed for a predetermined length. A thin-walled portion 17, forming a thin wall surface, is formed in a portion of the outer peripheral surface of the hollow portion 16. A ball bearing hole 18 is formed in this thin-walled portion 17, penetrating the hollow portion 16. The size and shape of the ball bearing hole 18 are such that when a ball bearing 19 is positioned in the ball bearing hole 18, the outer peripheral surface of the ball bearing 19 protrudes.

[0071] A ball bearing 19 is disposed in a ball bearing hole 18, and a leaf spring portion 20 is disposed on the back side of the ball bearing 19, i.e., in the direction opposite to the ball bearing hole 18. The leaf spring portion 20 elastically presses at least the outer periphery of the ball bearing 19, causing the ball bearing 19 to elastically protrude from the ball bearing hole 18. The leaf spring portion 20 is formed with a leaf spring hole portion 21 that is at least smaller than the diameter of the ball bearing 19 in order to elastically press the ball bearing 19 from the back side with a moderate strength. However, depending on the material hardness of the leaf spring portion 20, or the required pressing strength of the ball bearing 19 when disposed in the ball bearing hole 18, the leaf spring hole portion 21 may not be provided.

[0072] Furthermore, a cutout 22 is formed at the lower end of the hollow portion 16 of the pressure rod 3, which engages with the anti-rotation portion 24 protruding from the pressure rod joint portion 6 as described later.

[0073] A protrusion 23 is formed on the side of the pressure rod joint 6 opposite to the external threaded engagement portion 14. This protrusion 23 is inserted into the hollow portion 16 formed on the lower side of the pressure rod 3. A concave engaging portion 25 and an anti-rotation portion 24 are formed on the outer peripheral surface of the protrusion 23. When the protrusion 23 is inserted into the hollow portion 16 of the pressure rod 3, the engaging portion 25 engages with a ball 19 that elastically protrudes from the inner peripheral surface of the hollow portion 16 in a manner that allows for (one-touch) disassembly and assembly. The anti-rotation portion 24 engages with the aforementioned cutout portion 22. The anti-rotation portion 24 protrudes vertically from both ends of the protrusion 23 when viewed from the vertical direction. Furthermore, the number, angle, and shape of the cutout portions 22 correspond to those of the aforementioned protrusion 23.

[0074] With the above structure, if the protrusion 23 of the pressure rod connector 6 is inserted into the hollow part 16 of the pressure rod 3, the ball 19 and the engaging part 25 engage elastically, and at the same time the cut part 22 and the anti-rotation part 24 engage, so that the unit 15 can be installed in a one-touch manner relative to the pressure rod 3 without rotation.

[0075] Furthermore, a structure is described in which a hollow portion 16, a thin-walled portion 17, a ball hole 18, a cut portion 22 are formed in the pressure rod 3, a ball 19 is arranged in the ball hole 18, and a leaf spring portion 20 is arranged on the outside of the ball 19. On the other hand, a structure is described in which a protrusion 23 is formed in the pressure rod joint portion 6, and an anti-rotation portion 24 and a locking portion 25 are formed in the protrusion 23. However, a structure in which a protrusion 23 is formed in the pressure rod 3, an anti-rotation portion 24 and a locking portion 25 are formed in the protrusion 23, a hollow portion 16, a thin-walled portion 17, a ball hole 18, a cut portion 22 are formed in the pressure rod joint portion 6, a ball 19 is arranged in the ball hole 18, and a leaf spring portion 20 is arranged on the outside of the ball 19 is also adopted. Furthermore, since any structure that allows the pressure rod 3 and the pressure rod joint 6 to be installed together without rotation (with a single touch) is acceptable, the ball hole 18, ball 19, leaf spring 20, notch 22, protrusion 23, anti-rotation part 24, and engaging part 25 are not essential structures. Any structure that allows the pressure rod 3 and the pressure rod joint 6 to be installed together in a way that allows for installation and removal without rotation (with a single touch) is acceptable. For example, the leaf spring 20 could be an elastic body other than a leaf spring, the ball 19 could be a protrusion other than a ball shape, or the elastic body could be a structure other than the aforementioned structures that allows the protrusion to protrude elastically.

[0076] Moreover, such as Figure 5 (Also refer to) Figures 1-4As described, after the sewing machine presser foot 4 is installed in the sewing machine presser foot joint 5 (unit 12), the sewing machine presser foot joint 5 (unit 12) is installed in the presser bar joint 6 (unit 15), and the presser bar joint 6 is installed in the presser bar 3, that is, after the entire structure of the present invention is installed, the temporary fixing of the fixing part 7 (nut) is released, and the sewing machine presser foot joint 5, which is screwed into the presser bar joint 6, is rotated. While adjusting (fine-tuning) the height of the sewing machine presser foot 4, the rotation direction of the sewing machine presser foot joint 5 is adjusted to adjust the height and rotation direction of the sewing machine presser foot 4, and the fixing part 7 (nut) is set to a fully fixed state (formal tightening state).

[0077] For the aforementioned temporary fixation, the following method is shown: After the internal thread engagement portion 13 and the external thread engagement portion 14 are engaged by a predetermined amount, the fixing portion 7 is rotated toward the side of the sewing machine presser foot joint portion 5 where the internal thread engagement portion 13 is formed (excluding the internal thread engagement portion 13) until a predetermined frictional force is generated between the lower surface of the nut serving as the fixing portion 7 and the surface of the sewing machine presser foot joint portion 5 where the internal thread engagement portion 13 is formed (excluding the internal thread engagement portion 13), and the fixing portion 7 can still rotate, thereby temporarily fixing the unit 12 to the presser bar joint portion 6. However, it is also possible to temporarily fix the unit 12 or the sewing machine presser foot joint portion 5 to the presser bar joint portion 6 by only engaging the internal thread engagement portion 13 and the external thread engagement portion 14 by a predetermined amount without using the fixing portion 7 for temporary fixation, that is, the fixing portion 7 can be used only in the fully fixed state (formally tightened state). Regardless of the method, it is a temporary fixation as described above.

[0078] In this invention, as described above, by mounting the sewing machine presser foot 4 to the sewing machine presser foot connector 5 (constituent unit 12), it achieves the effect of fixing the presser foot 4, even those of low machining precision such as all types of sewing machine presser feet 4 or mounting grooves 9, without wobbling and with extreme stability. Furthermore, by setting the sewing machine presser foot connector 5 (unit 12) to the presser bar connector 6 (unit 15) and the presser bar connector 6 to the presser bar 3, i.e., after the entire structure of this invention is installed, the temporary fixing of the fixing part 7 (nut) is released. This allows for the adjustment of the height and rotation direction of the sewing machine presser foot 4 by simultaneously adjusting the height of the presser foot 4 and the rotation direction of the sewing machine presser foot connector 5. Afterward, the fixing part 7 is set to a fully fixed state (formal tightened state).

[0079] Next, in Figures 6 to 7 The installation and adjustment method of each component of the sewing machine presser foot adjustment structure of the present invention are described herein.

[0080] like Figure 6 As shown, the sewing machine presser foot adjustment method of the present invention includes the steps of installing the sewing machine presser foot 4 together with the connector 2 (step one), installing the connector 2 together with the presser bar 3 (step two), and adjusting the height direction and rotation direction of the sewing machine presser foot 4 using the connector 2 (step three).

[0081] like Figure 7 As shown, a more detailed method for adjusting the sewing machine presser foot includes the following steps: (Step 1) fixing the sewing machine presser foot 4 to the sewing machine presser foot joint 5; (Step 2) temporarily fixing the sewing machine presser foot joint 5 to the presser bar joint 6; (Step 3) detachably and easily attaching the presser bar joint 6 to the presser bar 3 without rotation; (Step 4) releasing the temporary fixation between the sewing machine presser foot joint 5 and the presser bar joint 6; (Step 5) adjusting the height and rotation direction of the sewing machine presser foot 4 by adjusting the sewing machine presser foot joint 5 and the presser bar joint 6 after the temporary fixation between them has been released; and (Step 6) fixing the sewing machine presser foot joint 5 and the presser bar joint 6 together after the adjustment.

[0082] The present invention, through the above-described sewing machine presser foot adjustment method, achieves the effect of fixing all types of sewing machine presser feet 4, or sewing machine presser feet 4 with low processing precision, without shaking and extremely stably. Furthermore, it enables the adjustment of the height of the sewing machine presser foot 4 and the orientation of the rotation direction of the sewing machine presser foot 4.

[0083] The above-mentioned adjustment structure and method for the sewing machine presser foot is a technique for fine-tuning the height and rotation direction of the sewing machine presser foot 4. The coarse adjustment of the height and rotation direction of the sewing machine presser foot 4 can be the method of adjusting the installation height and installation angle of the presser bar 3 as described in the prior art.

[0084] Furthermore, all the constituent materials of this invention are applicable to all materials such as metals, resins, and wood.

Claims

1. An adjustment structure for a sewing machine presser foot, characterized in that, The adjustment structure of the sewing machine presser foot has a joint between the presser bar and the sewing machine presser foot, which allows for height adjustment of the presser foot. The connector includes a presser foot connector and a presser bar connector. The presser foot connector is for mounting the presser foot, and the presser bar connector is for mounting the presser foot connector in a manner that allows for height adjustment along the presser foot connector. The presser bar connector is mounted on the presser bar. The presser foot joint and the presser bar joint of the sewing machine have an external thread and the other has an internal thread. The presser foot joint and the presser bar joint are screwed together. The height direction and rotation direction of the presser foot are adjusted by the depth and angle of the screwing of the internal thread and the external thread.

2. The adjustment structure for the sewing machine presser foot according to claim 1, characterized in that, The connector can adjust the rotation direction of the sewing machine presser foot.

3. The adjustment structure for the sewing machine presser foot according to claim 1, characterized in that, The sewing machine presser foot adjustment structure has a fixing part that is fixed after the height direction and / or rotation direction of the sewing machine presser foot is adjusted using the joint part.

4. The adjustment structure for the sewing machine presser foot according to claim 1, characterized in that, The sewing machine presser foot joint can be adjusted in rotation direction relative to the presser bar joint.

5. The adjustment structure for the sewing machine presser foot according to claim 4, characterized in that, The sewing machine presser foot adjustment structure has a fixing part that fixes the sewing machine presser foot joint to the presser bar joint after the height direction and / or rotation direction of the sewing machine presser foot joint relative to the presser bar joint has been adjusted.

6. The adjustment structure for the sewing machine presser foot according to any one of claims 1 to 3, characterized in that, The joint and the pressure rod have a mounting structure that allows them to be installed together in a detachable manner.

7. The adjustment structure for the sewing machine presser foot according to claim 4 or 5, characterized in that, The pressure rod joint and the pressure rod have a mounting structure that allows the pressure rod joint and the pressure rod to be installed together in a detachable manner.

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