Cloth feeding mechanism of household sewing machine

Abstract

A cloth feeding mechanism of a household sewing machine comprises a mounting support, a rotary lifting hook support, a positioning sleeve and a movable cloth feeding wrist are arranged on the mounting support, a cloth feeding wrist tension spring is connected between the rotary lifting hook support and the positioning sleeve, one end of the cloth feeding wrist tension spring is connected to the rotary lifting hook support, and the other end of the cloth feeding wrist tension spring is connected to the positioning sleeve. The positioning sleeve is connected with the cloth feeding wrist, the cloth feeding wrist is connected with the feeding arm, the feeding arm is arranged on the installation support, the feeding arm is provided with the feeding adjusting sliding block, the installation support is provided with the tuning box adjusting body, and the feeding adjusting sliding block can do reciprocating motion in the tuning box adjusting body. The horizontal cloth feeding mechanism has the advantages that gaps between parts of the horizontal cloth feeding mechanism can become extremely small, the cloth feeding amount is stable, the effect of stabilizing the cloth feeding amount is achieved, the sewing precision is improved, the quality of sewn products is improved, noise can be reduced, the user satisfaction degree can be improved, the use effect is good, and popularization is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of sewing machines, in particular to a cloth feeding mechanism of a household sewing machine. Background Art

[0002] At present, the cloth feed mechanism of a general household sewing machine adjusts the cloth feed amount required for sewing by combining two mechanisms: vertical cloth feed and horizontal cloth feed.

[0003] The vertical feed mechanism moves the feed arm equipped with the feed teeth up and down through the movement of the vertical feed cam configured on the lower shaft, and makes the feed teeth protrude on the upper side of the needle plate. In order to adjust the feed amount, the horizontal feed mechanism is equipped with a sliding mechanism on the mechanism that makes the feed teeth move forward and backward, and the forward and backward movement of the feed teeth is changed by changing the inclination of the slider. The mechanism that changes the sliding inclination generally transmits the angular displacement of the stepper motor to the sliding structure through a gear mechanism. The vertical feed mechanism does not require the change of the up and down movement of the feed teeth, so its mechanism is not complicated, and the movement of the vertical feed cam can simply transmit the vertical movement of the feed teeth. However, as mentioned above, the horizontal feed mechanism needs a sliding mechanism to change the movement of the horizontal feed, so the structure is complicated. Due to the combination gap of the mechanism components, the change of the feed amount and noise caused by the mechanism connection are prone to occur. Summary of the invention

[0004] The present invention aims to solve the above-mentioned shortcomings of the prior art and provide a household sewing machine cloth feeding mechanism, which can make the gap between the horizontal cloth feeding mechanism components extremely small, stabilize the cloth feeding amount, improve sewing accuracy, improve the quality of sewing products, and reduce noise.

[0005] The present invention solves the technical problem by adopting a technical solution: a cloth feeding mechanism of a household sewing machine comprises a mounting bracket, on which a swivel hook bracket, a positioning sleeve, and a movable cloth feeding wrist are arranged, a cloth feeding wrist tension spring is connected between the swivel hook bracket and the positioning sleeve, one end of the cloth feeding wrist tension spring is connected to the swivel hook bracket, and the other end of the cloth feeding wrist tension spring is connected to the positioning sleeve, the positioning sleeve is connected to the cloth feeding wrist, a feeding arm is connected to the feeding arm, the feeding arm is arranged on the mounting bracket, a feeding adjustment slider is arranged on the feeding arm, a tuning box adjustment body is arranged on the mounting bracket, and the feeding adjustment slider can reciprocate in the tuning box adjustment body.

[0006] Furthermore, a through hole is provided on the rotary hook bracket, and one end of the cloth feeding wrist tension spring passes through the through hole and hooks the rotary hook bracket.

[0007] Furthermore, the mounting bracket is provided with cloth feeding teeth.

[0008] Furthermore, the feeding adjustment slider can perform reciprocating motion in the adjustment body of the adjustment box, which is a reciprocating sliding motion.

[0009] Furthermore, the movable cloth feeding arm can perform back-and-forth reciprocating motion on the mounting bracket.

[0010] The beneficial effects of the present invention are as follows: the cloth feeding mechanism of the household sewing machine of the present invention has a reasonable structure, can make the gap between the horizontal cloth feeding mechanism components extremely small, stabilize the cloth feeding amount, achieve the effect of stabilizing the cloth feeding amount, improve the sewing accuracy, improve the quality of sewing products, can reduce noise, improve user satisfaction, have good use effect, and are conducive to promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0012] Figure 2 It is a schematic diagram of the side structure of an embodiment of the present invention.

[0013] Explanation of the reference numerals: mounting bracket A, swivel hook bracket 1, positioning sleeve 2, cloth feed wrist tension spring 3, movable cloth feed wrist 4, feeding arm 5, adjustment box adjustment body 6, feeding adjustment slider 7, through hole 8, cloth feed tooth 9. DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with the accompanying drawings:

[0015] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0017] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0019] Unless otherwise defined, the technical or scientific terms used herein shall have the common meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but indicate the existence of at least one.

[0020] Referring to the accompanying drawings: This household sewing machine cloth feeding mechanism includes a mounting bracket A, on which a rotary hook bracket 1, a positioning sleeve 2, and a movable cloth feeding wrist 4 are arranged. The rotary hook bracket 1, the positioning sleeve 2, and the movable cloth feeding wrist 4 are components that constitute the cloth feeding mechanism. A cloth feeding wrist tension spring 3 is connected between the rotary hook bracket 1 and the positioning sleeve 2. One end of the cloth feeding wrist tension spring 3 is connected to the rotary hook bracket 1, and the other end of the cloth feeding wrist tension spring 3 is connected to the positioning sleeve 2. The cloth feeding wrist tension spring 3 forms a spring structure. The positioning sleeve 2 is connected to the cloth feeding wrist 4, and the positioning sleeve 2 is fixed on the cloth feeding wrist 4. When the cloth feeding wrist 4 moves, the positioning sleeve 2 moves accordingly, and the cloth feeding wrist 4 is connected to the positioning sleeve 2. A feeding arm 5 is connected, and the feeding arm 5 is used to connect the cloth feeding wrist 4 and the feeding adjusting slider 7, so that when the cloth feeding wrist 4 moves, it can drive the feeding adjusting slider 7 to move. The feeding arm 5 is arranged on the mounting bracket A, and the feeding adjusting slider 7 is arranged on the feeding arm 5. The mounting bracket A is provided with a tuning box adjusting body 6. The feeding adjusting slider 7 can reciprocate in the tuning box adjusting body 6. The cloth feeding wrist 4, the positioning sleeve 2, the cloth feeding wrist tension spring 3, the feeding arm 5, the tuning box adjusting body 6, and the feeding adjusting slider 7 form a horizontal cloth feeding structure. The tuning box adjusting body 6 and the feeding adjusting slider 7 form a sliding mechanism. When working, the cloth feeding wrist tension spring 3 always moves to form a horizontal feeding structure. The feed adjustment slider 7 of the cloth mechanism applies a force opposite to the cloth feeding direction, so the feed adjustment slider 7 can be in close contact with the fixed direction of the adjustment box adjustment body 6 without being affected by the gap between the adjustment box adjustment body 6 and the feed adjustment slider 7. Due to its effect, the sliding mechanism can move in a stable position. Due to the action of the cloth feeding wrist tension spring 3, the cloth feeding start position of the horizontal cloth feeding mechanism is always in a fixed position, so the cloth feeding amount is stable. When the horizontal cloth feeding amount is changed, the inclination of the sliding mechanism is changed by changing the angle of the stepping motor. When the cloth feeding teeth have finished feeding the cloth and the cloth feeding teeth have dropped from the upper surface of the needle plate, the angle change of the stepping motor takes effect. This is to prevent the stepper motor from being out of step due to changes in the amount of cloth fed and the load of the cloth fed during the cloth feeding action. In the embodiment of the present invention, the stepper motor can operate effectively regardless of the timing of the angle change, and the amount of cloth fed is stable. The stabilization of these feed amounts is not only beneficial to flat seams, but also can greatly improve the sewing quality of embroidery patterns, thereby improving user satisfaction. In the embodiment of the present invention, because the gap between the components of the horizontal cloth feeding mechanism becomes extremely small, the noise generated is also extremely small, which is effective in preventing noise when the sewing machine is running at high speed. By preventing noise, the sewing machine can be made silent, user satisfaction can be improved, and the noise reduction effect can be achieved.

[0021] The rotary hook bracket 1 is provided with a through hole 8, and one end of the cloth feeding wrist tension spring 3 passes through the through hole 8 and hooks the rotary hook bracket 1. Such arrangement can facilitate the disassembly and assembly of the cloth feeding wrist tension spring 3, and facilitates disassembly and assembly maintenance.

[0022] The mounting bracket A is provided with a cloth feeding tooth 9.

[0023] The feeding adjustment slide block 7 can perform reciprocating motion in the adjustment box adjustment body 6 as a reciprocating sliding motion.

[0024] The movable cloth feeding arm 4 can do reciprocating motion back and forth on the mounting bracket A.

[0025] The remaining structure is the same as the cloth feeding structure of a conventional sewing machine and will not be described in detail.

[0026] During operation, when the horizontal feeding mechanism is operating, the feeding adjustment slider 7 and the tuning box adjustment body 6 continuously slide back and forth driven by the forward and backward movement of the cloth feeding wrist 4. At this time, the cloth feeding wrist tension spring 3 fixed on the positioning sleeve 2 applies a force to the cloth feeding wrist 4, so that the gap between the feeding adjustment slider 7 and the tuning box adjustment body 6 shrinks, effectively ensuring the smooth horizontal feeding.

[0027] The characteristics of the embodiments of the present invention are as follows: the cloth feeding mechanism of the household sewing machine of the present invention has a reasonable structure, can make the gap between the horizontal cloth feeding mechanism components extremely small, stabilize the cloth feeding amount, achieve the effect of stabilizing the cloth feeding amount, improve the sewing accuracy, improve the quality of sewing products, can reduce noise, improve user satisfaction, have good use effect, and are conducive to promotion.

[0028] Although the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A cloth feeding mechanism for a household sewing machine, characterized in that: The invention comprises a mounting bracket (A), wherein the mounting bracket (A) is provided with a swivel hook bracket (1), a positioning sleeve (2), and a movable cloth feeding wrist (4); a cloth feeding wrist tension spring (3) is connected between the swivel hook bracket (1) and the positioning sleeve (2); one end of the cloth feeding wrist tension spring (3) is connected to the swivel hook bracket (1), and the other end of the cloth feeding wrist tension spring (3) is connected to the positioning sleeve (2); the positioning sleeve (2) is connected to the cloth feeding wrist (4); a feeding arm (5) is connected to the cloth feeding wrist (4); the feeding arm (5) is provided with a feeding adjustment slider (7); the mounting bracket (A) is provided with a tuning box adjustment body (6); the feeding adjustment slider (7) can make reciprocating motion in the tuning box adjustment body (6).

2. The cloth feeding mechanism for a household sewing machine according to claim 1, characterized in that: The rotary hook bracket (1) is provided with a through hole (8), and one end of the cloth feeding wrist tension spring (3) passes through the through hole (8) to hook the rotary hook bracket (1).

3. The cloth feeding mechanism for a household sewing machine according to claim 1, characterized in that: The mounting bracket (A) is provided with a cloth feeding tooth (9).

4. The cloth feeding mechanism for a household sewing machine according to claim 1, characterized in that: The feeding adjustment slide block (7) can perform reciprocating motion in the adjustment box adjustment body (6), which is a reciprocating sliding motion.

5. The cloth feeding mechanism for a household sewing machine according to claim 1, characterized in that: The movable cloth feeding arm (4) can perform back-and-forth reciprocating motion on the mounting bracket (A).

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