Sewing machine reverse feeding wrench mounting structure and sewing machine thereof

Abstract

The utility model belongs to the technical field of sewing machines, and relates to a sewing machine reverse feeding wrench installation structure which comprises a machine shell of a sewing machine, a reverse feeding wrench mechanism is installed on the machine shell, the reverse feeding wrench mechanism comprises a support fixedly connected with the machine shell, a wrench shaft is rotationally arranged on the support, and the wrench shaft is connected with the machine shell. A reverse feeding wrench crank driven by a reverse feeding wrench is arranged at one end of the wrench shaft, a magnet assembly is arranged at the other end of the wrench shaft, and a Hall sensor assembly for sensing the position of the magnet assembly is further arranged on the support. The utility model further discloses the sewing machine with the reverse feeding wrench installation structure of the sewing machine. According to the reverse feeding wrench installation structure of the sewing machine, the mechanism structure is simplified, and the assembling, debugging and maintaining difficulty is lowered.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a sewing machine reverse feed wrench installation structure and the sewing machine. Background Art

[0002] With the development of technology, most industrial sewing machines currently use stepper motors to control the stitch length and direction of sewing machine feeding. Due to the conflict between the installation position and driving method of the stepper motor and the original reverse feed wrench structure, sewing machines currently equipped with stepper stitch length motors are generally no longer equipped with a reverse feed wrench mechanism at the same time. Due to the particularity of sewing some fabrics, operators often need to use a reverse feed wrench to assist sewing and improve efficiency. In view of this, it is necessary to provide a sewing machine reverse feed wrench installation structure and a sewing machine thereof, aiming to provide operators with a manual press wrench that can quickly change the feed stitch length and direction, thereby improving the flexibility of sewing.

[0003] In order to avoid interference with the stepping needle pitch motor mechanism, the reverse feed wrench should no longer use the previous mechanical structure, but should use a Hall sensor and a magnet to cooperate to realize the corresponding function of the electronic reverse feed wrench. This scheme requires that the position between the Hall sensor and the magnet needs to be accurately calibrated to ensure the effective use of the Hall sensor; in the general scheme, the Hall sensor and the magnet are independently installed on the casing, which makes the mechanism very troublesome whether it is assembly, debugging or maintenance. For example, Chinese utility model CN ​​217149552U (publication date: 20220809) discloses a sewing machine and its reverse sewing wrench installation structure, including a cover shell, which is used to connect the body of the sewing machine; the cover shell is formed with a mounting cavity on one side close to the body; a reverse sewing mechanism, which is arranged in the mounting cavity of the cover shell, and the reverse sewing wrench at one end thereof extends outside the cover shell. Its reverse stitching mechanism further includes a connecting shaft, which is arranged on the cover shell, and the reverse stitching wrench is rotatably arranged on the connecting shaft; a magnetic part, which is arranged on the reverse stitching wrench; and a Hall sensor, which is arranged on the cover shell and located above the magnetic part, and is used to sense the distance between itself and the magnetic part. Utility Model Content

[0004] The utility model aims at the deficiencies of the prior art and provides a sewing machine reverse feed wrench installation structure and a sewing machine thereof, which simplifies the mechanism structure and reduces the difficulty of assembly, debugging and maintenance.

[0005] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:

[0006] A reverse feed wrench installation structure for a sewing machine comprises a casing of the sewing machine, a reverse feed wrench mechanism is installed on the casing, the reverse feed wrench mechanism comprises a bracket fixedly connected to the casing, a wrench shaft is rotatably arranged on the bracket, a reverse feed wrench crank driven by the reverse feed wrench is arranged at one end of the wrench shaft, and a magnet assembly is arranged at the other end, and a Hall sensor assembly for sensing the position of the magnet assembly is also arranged on the bracket.

[0007] In the above-mentioned installation structure of the reverse feed wrench of a sewing machine, a magnet is arranged in the magnet assembly, and a Hall sensor is arranged in the Hall sensor assembly.

[0008] In the above-mentioned reverse feed wrench mounting structure for a sewing machine, a mounting hole is provided on the casing, and the reverse feed wrench extends out of the casing through the mounting hole.

[0009] In the above-mentioned reverse feed wrench mounting structure for a sewing machine, the reverse feed wrench is fixedly connected to the reverse feed wrench crank via its mounting end, and the mounting hole forms a through hole through which the mounting end of the reverse feed wrench can pass.

[0010] Alternatively, in the above-mentioned reverse feed wrench mounting structure for a sewing machine, the reverse feed wrench and the reverse feed wrench crank are integrally formed, and the mounting hole forms a slotted hole that gives way to the reverse feed wrench mechanism.

[0011] In the above-mentioned sewing machine reverse feed wrench installation structure, a reset mechanism is arranged between the reverse feed wrench crank and the bracket, and the reset mechanism includes a tension spring, and the two ends of the tension spring are respectively connected to the first tension spring screw and the second tension spring screw. The first tension spring screw is fixed on the bracket, and the second tension spring screw is fixed on the reverse feed wrench crank.

[0012] In the above-mentioned installation structure of the reverse feed wrench of a sewing machine, the reset mechanism may also use other structures, such as a torsion spring, etc.

[0013] In the above-mentioned installation structure of the reverse feed wrench of a sewing machine, the tension spring and the reverse feed wrench crank are respectively located on both sides of the bracket, a buffer sleeve is provided on the second tension spring screw, and a limiting groove through which the second tension spring screw and the buffer sleeve pass is provided on the bracket, and the upper and lower end surfaces of the limiting groove form a limiting structure for the movement stroke of the reverse feed wrench. When the reverse feed wrench drives the reverse feed wrench crank to move, the second tension spring screw and the buffer sleeve move within the stroke limited by the limiting groove.

[0014] In the above-mentioned sewing machine reverse feed wrench installation structure, the buffer sleeve is preferably made of plastic or rubber.

[0015] In the above-mentioned sewing machine reverse feed wrench mounting structure, a sleeve is provided on the bracket, the wrench shaft is inserted into the sleeve, one end of the wrench shaft is fixedly connected to the reverse feed wrench crank by a screw, and the other end is provided with a gasket that fits with the end surface of the sleeve and a buckle of the axial limiting gasket, and the buckle is installed in the buckle groove of the wrench shaft.

[0016] In the above-mentioned installation structure of the reverse feed wrench of a sewing machine, the magnet assembly is fixed to the end of the wrench shaft by screws, the Hall sensor assembly is fixed to the bracket by screws, and the bracket is fixed to the casing by screws.

[0017] The utility model also provides a sewing machine, comprising the above-mentioned sewing machine reverse feed wrench installation structure.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model provides a sewing machine reverse feed wrench installation structure and a sewing machine, which improves the reverse feed wrench mechanism. By setting an independent bracket, integrating a magnet component and a Hall sensor component, the reverse feed wrench mechanism can be independently assembled, debugged and repaired. During assembly, the reverse feed wrench mechanism can be pre-installed and debugged before being installed on the casing. While providing a manual press-type wrench function for quickly changing the feed stitch length and direction, the utility model simplifies the mechanism structure and reduces the difficulty of assembly, debugging and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the utility model;

[0021] Figure 2 It is a schematic diagram of the installation structure of the utility model;

[0022] Figure 3 It is an exploded view of the reverse feeding wrench mechanism of the utility model;

[0023] Figure 4 It is a three-dimensional diagram of the bracket of the utility model;

[0024] Figure numerals: 1. housing; 2. bracket; 3. wrench shaft; 4. reverse feed wrench; 5. reverse feed wrench crank; 6. magnet assembly; 7. Hall sensor assembly; 8. mounting hole; 9. mounting end; 10. tension spring; 11. first tension spring screw; 12. second tension spring screw; 13. buffer sleeve; 14. limiting groove; 15. shaft sleeve; 16. gasket; 17. buckle. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings. Figure 1-4 :

[0026] Example 1

[0027] A reverse feed wrench installation structure for a sewing machine comprises a casing 1 of the sewing machine, a reverse feed wrench mechanism is installed on the casing 1, the reverse feed wrench mechanism comprises a bracket 2 fixedly connected to the casing 1, a wrench shaft 3 is rotatably provided on the bracket 2, a reverse feed wrench crank 5 driven by a reverse feed wrench 4 is provided at one end of the wrench shaft 3, and a magnet assembly 6 is provided at the other end, and a Hall sensor assembly 7 for sensing the position of the magnet assembly 6 is also provided on the bracket 2.

[0028] The sensor assembly of this embodiment is fixed to the bracket 2 by screws, the magnet assembly 6 is fixed to the end face of the wrench shaft 3 by screws, and the bracket 2 is fixed to the housing 1 by screws. The magnet assembly 6 is provided with a magnet, and a Hall sensor is provided inside the sensor assembly. To ensure the effective use of the reverse feed wrench 4 function, the relative position of the magnet and the Hall sensor needs to be calibrated. Different from the previous mechanism, the reverse feed wrench mechanism of this embodiment can be debugged and calibrated as a separate mechanism, and assembled to the machine head after the debugging and calibration are accurate, thereby reducing the difficulty of debugging; similarly, during maintenance, the reverse feed wrench mechanism can also be removed separately for maintenance, and maintenance is also more convenient.

[0029] The specific working process of this embodiment is as follows: in the initial state, the reverse feed wrench 4 is pressed, and the reverse feed wrench 4 drives the wrench shaft to rotate through the reverse feed wrench crank 5, and the magnet assembly 6 starts to rotate accordingly. Because the relative position of the Hall sensor in the Hall sensor assembly 7 and the magnet in the magnet assembly 6 changes, the magnetic field strength detected by the Hall sensor changes, thereby causing the Hall voltage signal output of the Hall sensor to change. The sensor assembly feeds back the signal to the control box, and the control box issues a command to instantly adjust the sewing machine stitch length and feeding direction; in the initial state, the sewing machine moves according to the set stitch length value. After pressing the reverse feed wrench 4, the stitch length will continue to decrease until the stitch length becomes 0. Preferably, when the stitch length is 0, the reverse feed wrench 4 is located in the middle of the movement stroke; continue to press the reverse feed wrench 4, the stitch length will become a negative number, that is, reverse feeding begins. When pressed to the maximum stroke, the stitch length becomes a negative value corresponding to the set stitch length value.

[0030] In order to facilitate pressing the reverse feed wrench 4 , a mounting hole 8 is provided on the housing 1 , and the reverse feed wrench 4 extends out of the housing 1 through the mounting hole 8 .

[0031] In this embodiment, the reverse feed wrench 4 is fixedly connected to the reverse feed wrench crank 5 through its mounting end 9, and the mounting hole 8 forms a through hole through which the mounting end 9 of the reverse feed wrench 4 can pass. During assembly, one end of the reverse feed wrench 4 is passed through the mounting hole 8 and placed under the reverse feed wrench mechanism, and the two are fixedly connected by screws.

[0032] The above-mentioned reverse feed wrench 4 can also use other structures, for example: the reverse feed wrench 4 and the reverse feed wrench crank 5 are integrally formed, and the mounting hole 8 forms a slotted hole that makes way for the reverse feed wrench mechanism. During assembly, the reverse feed wrench mechanism (including the reverse feed wrench 4) only needs to be fixed to the housing 1 by screws through the slotted hole to make way for the assembly path of the reverse feed wrench mechanism.

[0033] A reset mechanism is provided between the above-mentioned reverse feed wrench crank 5 and the bracket 2, and the reset mechanism includes a tension spring 10, and the two ends of the tension spring 10 are respectively connected to a first tension spring screw 11 and a second tension spring screw 12, wherein the first tension spring screw 11 is fixed on the bracket 2, and the second tension spring screw 12 is fixed on the reverse feed wrench crank 5. During the pressing process, when the reverse feed wrench 4 is released, the reverse feed wrench 4 is driven to reset to the initial position under the action of the tension spring 10, and the needle distance is changed accordingly while being reset.

[0034] The above-mentioned tension spring 10 and the reverse feed wrench crank 5 are respectively located on both sides of the bracket 2, and a buffer sleeve 13 is sleeved on the second tension spring screw 12. The second tension spring screw 12 is fixed on the reverse feed wrench crank 5 after passing through the buffer sleeve 13. The bracket 2 is provided with a limiting groove 14 through which the second tension spring screw 12 and the buffer sleeve 13 pass. The upper and lower end surfaces of the limiting groove 14 form a limiting structure for the movement stroke of the reverse feed wrench 4. When the reverse feed wrench 4 drives the reverse feed wrench crank 5 to move, the second tension spring screw 12 and the buffer sleeve 13 move within the stroke limited by the limiting groove 14. After assembly, the activity range of the second screw tension spring 12 and the buffer sleeve 13 is limited to the limit groove 14 of the bracket 2, that is, the movement stroke of the reverse feed wrench 4 is determined by the limit groove 14; in the initial state, under the action of the tension spring 10, the buffer sleeve 13 is tangent to the upper end surface of the limit groove 14, and when the reverse feed wrench 4 is pressed by external force to drive the reverse feed wrench mechanism to rotate to the maximum stroke, the buffer sleeve 13 is tangent to the lower end surface of the limit groove 14. At this time, if the external force is released, under the action of the tension spring 10, the reverse feed wrench mechanism will be reset to the initial state.

[0035] The buffer sleeve 13 is preferably made of plastic or rubber, so as to reduce the impact force and noise generated on the mechanism during movement.

[0036] In this embodiment, the specific installation structure of the sleeve 15 is: a sleeve 15 is provided on the bracket 2, and the wrench shaft 3 is inserted into the sleeve 15. One end of the wrench shaft 3 is fixedly connected to the reverse feed wrench crank 5 by a screw, and the reverse feed wrench crank 5 is fitted with the end face of the sleeve 15. The other end is provided with a gasket 16 fitted with the other end face of the sleeve 15 and a buckle 17 of the axial limiting gasket 16, and the buckle 17 is installed in the buckle groove of the wrench shaft 3.

[0037] Example 2

[0038] A sewing machine comprises the sewing machine reverse feed wrench installation structure in embodiment 1.

[0039] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sewing machine reverse feed wrench mounting structure, comprising a housing (1) of the sewing machine, a reverse feed wrench mechanism being mounted on the housing (1), characterized in that: The reverse feed wrench mechanism comprises a bracket (2) fixedly connected to a housing (1); a wrench shaft (3) is rotatably arranged on the bracket (2); a reverse feed wrench crank (5) driven by a reverse feed wrench (4) is arranged at one end of the wrench shaft (3); a magnet assembly (6) is arranged at the other end; and a Hall sensor assembly (7) for sensing the position of the magnet assembly (6) is also arranged on the bracket (2).

2. A sewing machine reverse feed wrench installation structure according to claim 1, characterized in that: The casing (1) is provided with a mounting hole (8), and the reverse feed wrench (4) extends out of the casing (1) through the mounting hole (8).

3. A sewing machine reverse feed wrench installation structure according to claim 2, characterized in that: The reverse feed wrench (4) is fixedly connected to the reverse feed wrench crank (5) via its mounting end (9), and the mounting hole (8) forms a through hole through which the mounting end (9) of the reverse feed wrench (4) can pass.

4. A sewing machine reverse feed wrench installation structure according to claim 2, characterized in that: The reverse feed wrench (4) and the reverse feed wrench crank (5) are integrally formed, and the mounting hole (8) forms a slotted hole that gives way to the reverse feed wrench mechanism.

5. The installation structure of the reverse feed wrench of a sewing machine according to claim 1, characterized in that: A reset mechanism is provided between the reverse feed wrench crank (5) and the bracket (2), and the reset mechanism comprises a tension spring (10), the two ends of the tension spring (10) are respectively connected to a first tension spring screw (11) and a second tension spring screw (12), the first tension spring screw (11) is fixed on the bracket (2), and the second tension spring screw (12) is fixed on the reverse feed wrench crank (5).

6. A sewing machine reverse feed wrench installation structure according to claim 5, characterized in that: The tension spring (10) and the reverse feed wrench crank (5) are respectively located on two sides of the bracket (2); a buffer sleeve (13) is sleeved on the second tension spring screw (12); a limiting groove (14) is provided on the bracket (2) through which the second tension spring screw (12) and the buffer sleeve (13) pass; the upper and lower end surfaces of the limiting groove (14) form a limiting structure for the movement stroke of the reverse feed wrench (4).

7. A sewing machine reverse feed wrench installation structure according to claim 1, characterized in that: The bracket (2) is provided with a shaft sleeve (15), the wrench shaft (3) is inserted into the shaft sleeve (15), one end of the wrench shaft (3) is fixedly connected to the reverse feed wrench crank (5) by means of a screw, and the other end is provided with a gasket (16) which is in contact with the end surface of the shaft sleeve (15) and a buckle (17) of the axial limiting gasket (16), and the buckle (17) is installed in a buckle groove of the wrench shaft (3).

8. The installation structure of a reverse feed wrench for a sewing machine according to claim 1, characterized in that: The magnet assembly (6) is fixed to the end of the wrench shaft (3) by means of screws, the Hall sensor assembly (7) is fixed to the bracket (2) by means of screws, and the bracket (2) is fixed to the casing (1) by means of screws.

9. A sewing machine, characterized in that: The invention comprises a sewing machine reverse feed wrench mounting structure as claimed in any one of claims 1 to 8.

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