Sewing machine feeding wrench mechanism with different movement intervals and sewing machine with sewing machine feeding wrench mechanism

Abstract

The utility model belongs to the technical field of sewing machines, and relates to a sewing machine feeding wrench mechanism with different movement intervals and a sewing machine comprising the sewing machine feeding wrench mechanism. The sewing machine feeding wrench mechanism comprises a support, a shaft sleeve and a special-shaped hole are arranged on the support, a torsion spring is sleeved on the shaft sleeve, and the movable end of the torsion spring is installed on the special-shaped hole and the support respectively. A shaft sleeve is arranged on the support, a wrench shaft is assembled in the shaft sleeve, a feeding wrench crank driven by a feeding wrench is arranged at one end of the wrench shaft, a tension spring is arranged between the feeding wrench crank and the support, a boss assembled in the special-shaped hole is arranged on the feeding wrench crank, and when the feeding wrench mechanism moves in the first interval, the boss does not make contact with the torsion spring, and when the feeding wrench mechanism moves in the second interval, the boss does not make contact with the tension spring. When moving in the second interval, the boss abuts against the torsion spring and drives the torsion spring to twist. According to the sewing machine feeding wrench mechanism with the different movement intervals and the sewing machine with the sewing machine feeding wrench mechanism, the sewing flexibility is improved, and false triggering of the function of an electronic reverse feeding wrench caused by machine vibration or external force interference in the sewing process is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a sewing machine feeding wrench mechanism with different motion ranges and a sewing machine thereof. 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.

[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 solution 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 solution, the reverse stitch wrench mechanism is divided into multiple components and is independently installed on the casing, which makes the mechanism very troublesome whether it is assembled, debugged or repaired. In addition, machine vibration or external force interference during sewing may cause the electronic reverse feed wrench function to be falsely triggered, affecting the sewing stitches. For example, Chinese utility model CN ​​217149552 U (publication date: 20220809) discloses a sewing machine and its reverse stitch wrench installation structure, including a cover shell, which is used to connect the body of the sewing machine; the cover shell is formed with an installation cavity on one side close to the body; a reverse stitch mechanism, which is arranged in the installation cavity of the cover shell, and the reverse stitch 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 feed wrench mechanism with different motion ranges, which improves the flexibility of sewing and avoids the false triggering of the electronic reverse feed wrench function caused by machine vibration or external force interference during the sewing process.

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

[0006] A feed wrench mechanism for a sewing machine with different motion ranges comprises a bracket, a shaft sleeve and a special-shaped hole are provided on the bracket, a torsion spring is sleeved on the shaft sleeve, the movable ends of the torsion spring are respectively mounted on the special-shaped hole and the bracket, a wrench shaft is assembled in the shaft sleeve, a feed wrench crank driven by a feed wrench is arranged at one end of the wrench shaft, a tension spring is arranged between the feed wrench crank and the bracket, a boss assembled in the special-shaped hole is arranged on the feed wrench crank, when the feed wrench mechanism moves in the first range, the boss does not contact the torsion spring, and when the feed wrench mechanism moves in the second range, the boss contacts the torsion spring and drives it to twist.

[0007] In the above-mentioned sewing machine feed wrench mechanism with different movement ranges, the first range is set as a buffer zone, and when the feed wrench mechanism moves in the first range, the stitch length and the feeding direction remain unchanged, and the second range is set as an adjustment range, and when the feed wrench mechanism moves in the second range, the stitch length and the feeding direction are adjusted.

[0008] In the above-mentioned sewing machine feed wrench mechanism with different motion ranges, a positioning protrusion is arranged in the special-shaped hole, a positioning hook is arranged on the bracket, and two movable ends of the torsion spring are respectively mounted on the positioning protrusion and the positioning hook.

[0009] In the above-mentioned sewing machine feed wrench mechanism with different motion ranges, 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 feed wrench crank.

[0010] In the above-mentioned sewing machine feed wrench mechanism with different motion ranges, the tension spring and the 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 motion stroke of the feed wrench. When the feed wrench drives the feed wrench crank to move, the second tension spring screw and the buffer sleeve move within the stroke limited by the limiting groove.

[0011] In the above-mentioned sewing machine feed wrench mechanism with different motion ranges, the buffer sleeve is preferably made of plastic or rubber.

[0012] In the above-mentioned sewing machine feed wrench mechanism with different motion ranges, a magnet assembly is provided at the other end of the wrench shaft opposite to the feed wrench crank, and a Hall sensor assembly for sensing the position of the magnet assembly is provided on the bracket.

[0013] In the above-mentioned sewing machine feed wrench mechanism with different motion ranges, a magnet is arranged in the magnet assembly, and a Hall sensor is arranged in the Hall sensor assembly.

[0014] In the above-mentioned feed wrench mechanism of a sewing machine with different motion ranges, the feed wrench mechanism is installed on a casing, a mounting hole is provided on the casing, and the feed wrench extends out of the casing through the mounting hole.

[0015] In the above-mentioned sewing machine feed wrench mechanism with different motion ranges, 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, and the gasket forms an axial limiting structure of the wrench shaft and the torsion spring.

[0016] In the above-mentioned sewing machine feed wrench mechanism with different motion ranges, the reverse feed wrench is fixedly connected to the reverse feed wrench crank through its mounting end, and the mounting hole forms a through hole through which the mounting end of the reverse feed wrench can pass.

[0017] Alternatively, in the above-mentioned feed wrench mechanism of a sewing machine with different motion ranges, the feed wrench and the feed wrench crank are integrally formed, and the mounting hole forms a slotted hole that gives way to the feed wrench mechanism.

[0018] In the above-mentioned sewing machine feed wrench mechanism with different motion ranges, 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.

[0019] The utility model also provides a sewing machine, comprising the above-mentioned sewing machine feeding wrench mechanism with different motion ranges.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. The utility model provides a sewing machine feed wrench mechanism with different motion ranges and a sewing machine thereof. When the feed wrench mechanism moves in the first range, it will only be affected by the force of the tension spring. When it moves in the second range, it will be affected by the combined force of the tension spring and the torsion spring. Due to the different forces, the operator needs different forces when operating the feed wrench, thereby dividing the motion mode of the feed wrench mechanism into two clear and independent motion ranges. The utility model provides a manual press wrench that can quickly change the feed stitch length and direction, thereby improving the flexibility of sewing.

[0022] 2. The utility model sets the first section as a buffer zone. When the feed wrench mechanism moves in the first section, the stitch length and the feeding direction remain unchanged. The second section is set as an adjustment section. When the feed wrench mechanism moves in the second section, the stitch length and the feeding direction are adjusted. This prevents the electronic reverse feed wrench function from being triggered by machine vibration or external force interference during sewing.

[0023] 3. The utility model provides an independent bracket and integrates all the parts of the feed wrench mechanism, so that the feed wrench mechanism can be independently assembled, debugged and maintained. During assembly, the feed wrench mechanism can be pre-installed and debugged before being installed on the casing. This simplifies the mechanism structure and reduces the difficulty of assembly, debugging and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional diagram of the utility model;

[0025] Figure 2 yes Figure 1 A partial enlarged view of

[0026] Figure 3 It is a schematic diagram of the installation structure of the utility model;

[0027] Figure 4 It is an exploded view of the reverse feeding wrench mechanism of the utility model;

[0028] Figure 5 It is a three-dimensional diagram of the bracket of the utility model;

[0029] Figure 6 It is a stereoscopic diagram of the crank of the feeding wrench of the utility model;

[0030] Figure numerals: 1. bracket; 2. bushing; 3. special-shaped hole; 4. torsion spring; 5. wrench shaft; 6. feed wrench; 7. feed wrench crank; 8. tension spring; 9. boss; 10. positioning protrusion; 11. positioning hook; 12. first tension spring screw; 13. second tension spring screw; 14. buffer sleeve; 15. limit groove; 16. magnet assembly; 17. Hall sensor assembly; 18. housing; 19. mounting hole; 20. gasket; 21. buckle. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings. Figure 1-6 :

[0032] Example 1

[0033] A feed wrench mechanism for a sewing machine with different motion ranges comprises a bracket 1, wherein the bracket 1 is provided with a shaft sleeve 2 and a special-shaped hole 3, the shaft sleeve 2 is provided with a torsion spring 4, the movable ends of the torsion spring 4 are respectively mounted on the special-shaped hole 3 and the bracket 1, a wrench shaft 5 is assembled in the shaft sleeve 2, a feed wrench 6 crank driven by a feed wrench 6 is arranged at one end of the wrench shaft 5, a tension spring 8 is arranged between the feed wrench 6 crank and the bracket 1, a boss 9 assembled in the special-shaped hole 3 is arranged on the feed wrench 6 crank, when the feed wrench mechanism moves in the first range, the boss 9 does not contact the torsion spring 4, and when the feed wrench mechanism moves in the second range, the boss 9 contacts the torsion spring 4 and drives it to twist.

[0034] The way in which the feeding wrench mechanism is arranged with different motion intervals in this embodiment is as follows: the feeding wrench mechanism divides the motion interval of the entire mechanism into two intervals through the torsion spring 4: in the initial state, under the action of the tension spring 8, the boss 9 and the torsion spring 4 are not in contact; when the operator presses the feeding wrench 6, the feeding wrench 6 drives the feeding wrench 6 crank to rotate until the boss 9 is tangent to the torsion spring 4, and this motion interval is the first interval, and the feeding wrench 6 crank is only subjected to the force of the tension spring 8; after passing through the first interval, the feeding wrench 6 crank is subjected to the combined force of the tension spring 8 and the torsion spring 4, and when the feeding wrench mechanism moves to the maximum stroke, this motion interval is the second interval, and if the external force is released at this time, the feeding wrench mechanism will be reset to the initial state under the combined force of the tension spring 8 and the torsion spring 4. In the first interval, the feeding wrench mechanism is only subjected to the force of the tension spring 8, and the feeding wrench 6 only needs a small force to operate; in the second interval, the feeding wrench mechanism is subjected to the combined force of the tension spring 8 and the torsion spring 4, and the feeding wrench 6 requires a greater force than in the first interval to operate.

[0035] Furthermore, the first section is set as a buffer zone, and when the feed wrench mechanism moves in the first section, the stitch length and the feeding direction remain unchanged, and the second section is set as an adjustment section, and when the feed wrench mechanism moves in the second section, the stitch length and the feeding direction are adjusted. In order to achieve the adjustment of the stitch length and the feeding direction, a magnet assembly 16 is provided at the other end of the wrench shaft 5 opposite to the crank of the feed wrench 6, and a Hall sensor assembly 17 for sensing the position of the magnet assembly 16 is provided on the bracket 1, a magnet is provided in the magnet assembly 16, and a Hall sensor is provided in the Hall sensor assembly 17.

[0036] The specific working process of the stitch length and feeding direction of this embodiment is: when the feeding wrench mechanism is located in the first interval, the feeding wrench 6 is pressed, and the stitch length and feeding direction will not change, that is, the first interval is equivalent to a buffer zone, which is used to prevent the machine vibration or external force interference during the sewing process from causing the false triggering of the electronic reverse feeding wrench 6 function; when the feeding wrench mechanism passes through the first interval and is located in the second interval, the feeding wrench 6 is continued to be pressed, and the feeding wrench 6 drives the magnet assembly 16 to rotate. Due to the relative change of the Hall sensor and the magnet position, the magnetic field strength detected by the Hall sensor changes, This causes the Hall voltage signal output of the Hall sensor to change. The Hall sensor assembly 17 feeds back the signal to the control box, which issues a command to instantly adjust the sewing machine's stitch length and feeding direction. In the first interval, the sewing machine moves according to the set stitch length value. In the second interval, the feed wrench 6 is continuously pressed, and the stitch length will continue to decrease until the stitch length becomes 0. Preferably, when the stitch length is 0, the feed wrench 6 is located in the middle of the movement stroke. If the feed wrench 6 is continued to be pressed, the stitch length will become a negative number, that is, reverse feeding begins. When the feed wrench is pressed to the maximum stroke, the stitch length becomes a negative value corresponding to the set stitch length value. During the pressing process, when the feed wrench 6 is released, the feed wrench 6 is driven to reset to the initial position under the force of the tension spring 8 or the combined force of the tension spring 8 and the torsion spring 4. At the same time as the reset, the stitch length also changes accordingly.

[0037] The specific installation structure of the torsion spring 4 in this embodiment is as follows: a positioning protrusion 10 is provided in the special-shaped hole 3, a positioning hook 11 is provided on the bracket 1, and the two movable ends of the torsion spring 4 are respectively installed on the positioning protrusion 10 and the positioning hook 11. The bracket 1 and the shaft sleeve 2 are connected as a whole by welding, and the torsion spring 4 is fitted with the outer ring of the shaft sleeve 2, one end of which is inserted into the special-shaped hole 3 on the bracket 1 and is tangent to the upper side of the positioning protrusion 10, and the other end is inserted from the outer side of the positioning hook 11 on the bracket 1 to the bottom of the positioning hook 11 and is tangent to the hook-shaped inner side of the positioning hook 11.

[0038] The specific installation structure of the tension spring 8 in this embodiment is: the two ends of the tension spring 8 are respectively connected to the first tension spring screw 12 and the second tension spring screw 13, the first tension spring screw 12 is fixed on the bracket 1, and the second tension spring screw 13 is fixed on the crank of the feed wrench 6. Further, the tension spring 8 and the crank of the feed wrench 6 are respectively located on both sides of the bracket 1, and the second tension spring screw 13 is sleeved with a buffer sleeve 14, and the bracket 1 is provided with a limiting groove 15 through which the second tension spring screw 13 and the buffer sleeve 14 pass, and the upper and lower end surfaces of the limiting groove 15 form a limiting structure for the movement stroke of the feed wrench 6. When the feed wrench 6 drives the feed wrench 6 crank to move, the second tension spring screw 13 and the buffer sleeve 14 move within the stroke limited by the limiting groove 15. After assembly, the activity range of the second screw tension spring 8 and the buffer sleeve 14 is limited to the limit groove 15 of the bracket 1, that is, the movement stroke of the feed wrench 6 is determined by the limit groove 15; in the initial state, under the action of the tension spring 8, the buffer sleeve 14 is tangent to the upper end surface of the limit groove 15, and when the feed wrench 6 is pressed by external force to drive the feed wrench mechanism to rotate to the maximum stroke, the buffer sleeve 14 is tangent to the lower end surface of the limit groove 15. At this time, if the external force is released, under the action of the tension spring 8 and the torsion spring 4, the feed wrench mechanism will be reset to the initial state.

[0039] The buffer sleeve 14 is preferably made of plastic or rubber, so as to reduce the impact force and noise generated on the mechanism during movement.

[0040] One end of the wrench shaft 5 is fixedly connected to the crank of the reverse feed wrench 6 by a screw, and the other end is provided with a gasket 20 that fits with the end surface of the sleeve 2 and a buckle 21 of the axial limiting gasket 20. The buckle 21 is installed in the buckle groove of the wrench shaft 5, and the gasket 20 forms an axial limiting structure for the wrench shaft 5 and the torsion spring 4.

[0041] The feed wrench mechanism is mounted on a housing 18 . A mounting hole 19 is provided on the housing 18 . The feed wrench 6 extends out of the housing 18 through the mounting hole 19 .

[0042] In this embodiment, the feed wrench 6 is fixedly connected to the feed wrench 6 crank through its mounting end, and the mounting hole 19 forms a through hole through which the mounting end of the feed wrench 6 can pass. During assembly, one end of the feed wrench 6 is passed through the mounting hole 19 and placed under the feed wrench mechanism, and the two are fixedly connected by screws.

[0043] The feed wrench 6 may also use other structures, for example, the feed wrench 6 and the feed wrench 6 crank are integrally formed, and the mounting hole 19 forms a slotted hole for making way for the feed wrench mechanism. During assembly, the feed wrench mechanism (including the feed wrench 6) is fixed to the housing 18 by screws through the slotted hole to make way for the assembly path of the feed wrench mechanism.

[0044] The components in this embodiment are preferably fixed by screws: the magnet assembly 16 is fixed to the end of the wrench shaft 5 by screws, the Hall sensor assembly 17 is fixed to the bracket 1 by screws, and the bracket 1 is fixed to the housing 18 by screws.

[0045] Example 2

[0046] A sewing machine comprises the sewing machine feed wrench mechanism with different motion ranges in embodiment 1.

[0047] 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 feed wrench mechanism with different motion ranges, characterized in that: The invention comprises a bracket (1), wherein a shaft sleeve (2) and a special-shaped hole (3) are arranged on the bracket (1), a torsion spring (4) is sleeved on the shaft sleeve (2), and the movable ends of the torsion spring (4) are respectively mounted on the special-shaped hole (3) and the bracket (1), a spanner shaft (5) is mounted in the shaft sleeve (2), a feed spanner crank (7) driven by a feed spanner (6) is arranged at one end of the spanner shaft (5), a tension spring (8) is arranged between the feed spanner crank (7) and the bracket (1), and a boss (9) mounted in the special-shaped hole (3) is arranged on the feed spanner crank (7), when the feed spanner mechanism moves in the first interval, the boss (9) does not contact the torsion spring (4), and when the feed spanner mechanism moves in the second interval, the boss (9) contacts the torsion spring (4) and drives it to twist.

2. A sewing machine feed wrench mechanism with different motion ranges according to claim 1, characterized in that: The first interval is set as a buffer zone. When the feeding wrench mechanism moves in the first interval, the needle distance and the feeding direction remain unchanged. The second interval is set as an adjustment interval. When the feeding wrench mechanism moves in the second interval, the needle distance and the feeding direction are adjusted.

3. A sewing machine feed wrench mechanism with different motion ranges according to claim 1, characterized in that: A positioning protrusion (10) is arranged in the special-shaped hole (3), a positioning hook (11) is arranged on the bracket (1), and two movable ends of the torsion spring (4) are respectively mounted on the positioning protrusion (10) and the positioning hook (11).

4. A sewing machine feed wrench mechanism with different motion ranges according to claim 1, characterized in that: The two ends of the tension spring (8) are respectively connected to a first tension spring screw (12) and a second tension spring screw (13); the first tension spring screw (12) is fixed on the bracket (1), and the second tension spring screw (13) is fixed on the feed wrench crank (7).

5. A sewing machine feed wrench mechanism with different motion ranges according to claim 4, characterized in that: The tension spring (8) and the feed wrench crank (7) are respectively located on two sides of the bracket (1); a buffer sleeve (14) is sleeved on the second tension spring screw (13); a limiting groove (15) is provided on the bracket (1) through which the second tension spring screw (13) and the buffer sleeve (14) pass; and the upper and lower end surfaces of the limiting groove (15) form a limiting structure for the movement stroke of the feed wrench (6).

6. A sewing machine feed wrench mechanism with different motion ranges according to claim 1, characterized in that: A magnet assembly (16) is arranged at the other end of the wrench shaft (5) opposite to the feed wrench crank (7), and a Hall sensor assembly (17) for sensing the position of the magnet assembly (16) is arranged on the bracket (1).

7. A sewing machine feed wrench mechanism with different motion ranges according to claim 1, characterized in that: The feeding wrench mechanism is mounted on a casing (18), a mounting hole (19) is provided on the casing (18), and the feeding wrench (6) extends out of the casing (18) through the mounting hole (19).

8. A sewing machine feed wrench mechanism with different motion ranges according to claim 1, characterized in that: One end of the wrench shaft (5) is fixedly connected to the feed wrench crank (7) by means of a screw, and the other end is provided with a gasket (20) which is in contact with the end surface of the shaft sleeve (2) and a buckle (21) of the axial limiting gasket (20), and the buckle (21) is installed in a buckle groove of the wrench shaft (5).

9. A sewing machine, characterized in that: A sewing machine feed wrench mechanism with different motion ranges comprising any one of claims 1-8.

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