Thread sweeping mechanism of sewing machine

Abstract

The utility model discloses a thread sweeping mechanism of a sewing machine, which relates to the technical field of sewing machines, and the sewing machine comprises a machine head, a presser foot and a machine needle, a thread sweeping mechanism is further arranged in the machine head and comprises a driving air cylinder, a gear and rack assembly and a thread sweeping roller which are connected in sequence; the driving air cylinder drives the thread sweeping roller to rotate in a reciprocating mode through the gear and rack assembly, and therefore the thread sweeping roller sweeps the gap between the presser foot and the machine needle. According to the utility model, the driving cylinder drives the line sweeping roller to rotate in a reciprocating manner, so that the line sweeping action is more stable and efficient, and compared with the prior art, the energy consumption is lower, the structure is simpler and the maintenance is not needed.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines, and in particular relates to a thread-wiping mechanism for a sewing machine. Background Art

[0002] Automatic sewing machine is controlled by computer and equipped with automatic monitoring system, feeding system, automatic sewing start, sewing according to set trajectory, needle stopping, thread cutting and other functions, which can automatically complete certain sewing processes.

[0003] After each sewing of the automatic sewing machine, the cutting mechanism will automatically trim the thread once. After trimming the thread, the thread end is below the presser foot hole. A thread sweeping action is required to make the thread end above the presser foot hole to prevent excess thread ends from being generated at the needle starting position when sewing again.

[0004] Most of the existing thread sweeping mechanisms drive the thread sweeping rod to rotate by the mutual attraction between the electromagnet and the permanent magnet, wherein the electromagnet is fixedly arranged, the permanent magnet is connected to the thread sweeping rod, and the power supply of the electromagnet is turned on when the thread sweeping is required to realize the thread sweeping action, and then the power supply is turned off, so that the permanent magnet falls back to its original position under the action of gravity. However, when the automatic sewing machine is sewing, the frequency of thread sweeping is extremely high, so the power supply of the electromagnet needs to be repeatedly turned on and off, and in order to control the size of the magnetic force of the electromagnet, a lot of electric energy is required, and the efficiency of the electromagnet itself is relatively low; and because the electromagnet generates a lot of heat when it is powered on, long-term operation may cause the temperature to be too high; at the same time, the electromagnet will produce wear and corrosion during long-term operation, so it needs to be regularly inspected and replaced.

[0005] Therefore, there is an urgent need for a more efficient and stable driving method to achieve the line sweeping action. Utility Model Content

[0006] In order to solve the above problems existing in the prior art, the utility model aims to provide a thread-wiping mechanism for a sewing machine.

[0007] The technical solution adopted by the utility model is:

[0008] A thread-wiping mechanism for a sewing machine comprises a machine head and a presser foot and a sewing needle arranged in the machine head; a thread-wiping mechanism is also arranged in the machine head, and the thread-wiping mechanism comprises a driving cylinder, a gear rack assembly and a thread-wiping rod connected in sequence; the driving cylinder drives the thread-wiping rod to reciprocate through the gear rack assembly, so that the thread-wiping rod sweeps the gap between the presser foot and the sewing needle.

[0009] Optionally, the rack and pinion assembly includes a transmission rack, a transmission gear and a transmission shaft; a transmission rack is provided at the movable end of the driving cylinder, the transmission shaft is rotatably mounted on one side of the needle, a transmission gear is provided on the transmission shaft, the transmission gear and the transmission rack are meshed with each other, and the wire sweeping rod is installed on the transmission shaft.

[0010] Optionally, the thread sweeping rod is L-shaped, one end of the thread sweeping rod is mounted on the transmission shaft, and the other end sweeps the gap between the presser foot and the sewing needle.

[0011] As an option, the driving cylinder is a reciprocating cylinder or an electric push rod.

[0012] Optionally, a needle driving mechanism is provided in the machine head, and the needle driving mechanism is used to drive the needle to move up and down.

[0013] Optionally, the needle drive mechanism includes a drive motor, a cam and a connecting rod; the needle is installed on the needle bar, the needle bar movable sleeve is installed in the needle bar sleeve, and the needle bar sleeve is installed in the machine head; the drive motor is used to drive the cam to rotate, the two ends of the connecting rod are respectively hinged to the cam and the needle bar, and the drive motor is electrically connected to the drive cylinder.

[0014] Optionally, the driving motor is connected to the cam via a connecting shaft, a connecting sleeve is sleeved on the needle bar, and the connecting sleeve is hingedly connected to the connecting rod.

[0015] As an option, a sliding assembly is provided in the machine head, and the sliding assembly includes a slide rail and a slider. The slide rail is installed on one side of the needle bar, and the slider is slidably installed in the slide rail. A thread take-up rod is provided between the slider and the connecting sleeve, and the connecting rod is hingedly connected to the thread take-up rod.

[0016] The beneficial effects of the utility model are:

[0017] The utility model provides a thread sweeping mechanism for a sewing machine, the sewing machine comprises a machine head and a presser foot and a sewing needle arranged in the machine head; a thread sweeping mechanism is also arranged in the machine head, and the thread sweeping mechanism comprises a driving cylinder, a gear rack assembly and a thread sweeping rod connected in sequence; the driving cylinder drives the thread sweeping rod to reciprocate through the gear rack assembly, so that the thread sweeping rod sweeps the gap between the presser foot and the sewing needle. The utility model drives the thread sweeping rod to reciprocate by driving the cylinder, so that when the thread sweeping action is realized, it is more stable and efficient, and at the same time, compared with the prior art, it has lower energy consumption and a simpler structure and does not require maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the installation position of the utility model on the machine head.

[0019] Figure 2 It is a structural schematic diagram of the thread sweeping mechanism and the needle driving mechanism.

[0020] Figure 3 yes Figure 2 The enlarged diagram of the selected part in the middle box.

[0021] Figure 4 It is a structural diagram of the wire sweeping mechanism.

[0022] In the figure: 1-machine head, 2-presser foot, 21-presser foot hole, 3-needle, 4-thread sweeping mechanism, 41-driving cylinder, 42-transmission rack, 43-transmission gear, 44-transmission shaft, 45-thread sweeping rod, 5-needle driving mechanism, 51-driving motor, 52-connecting shaft, 53-cam, 54-connecting rod, 55-sliding assembly, 56-connecting sleeve, 57-needle bar, 58-needle bar sleeve. DETAILED DESCRIPTION

[0023] In this embodiment, if Figures 1 to 4 A thread-wiping mechanism of a sewing machine is shown, and the sewing machine includes a head 1 and a presser foot 2 and a needle 3 arranged in the head 1; a thread-wiping mechanism 4 is also arranged in the head 1, and the thread-wiping mechanism 4 includes a driving cylinder 41, a gear rack assembly and a thread-wiping rod 45 connected in sequence; the driving cylinder 41 drives the thread-wiping rod 45 to reciprocate through the gear rack assembly, so that the thread-wiping rod 45 sweeps the gap between the presser foot 2 and the needle 3.

[0024] Specifically, the gear rack assembly includes a transmission rack 42, a transmission gear 43 and a transmission shaft 44; the movable end of the driving cylinder 41 is provided with a transmission rack 42, the transmission shaft 44 is rotatably mounted on one side of the needle 3, a transmission gear 43 is provided on the transmission shaft 44, the transmission gear 43 and the transmission rack 42 are meshed with each other, and the thread sweeping rod 45 is mounted on the transmission shaft 44. The presser foot 2 has a presser foot hole 21. When sweeping the thread, the needle 3 moves upward so that the entire needle 3 is located above the presser foot hole 21. At this time, the thread head is still located in the presser foot hole 21. The driving cylinder 41 drives the transmission rack 42 to move downward, so that the transmission gear 43 drives the transmission shaft 44 to rotate, and then drives the thread sweeping rod 45 to rotate. After the thread sweeping rod 45 sweeps the gap between the needle 21 and the presser foot hole 21, the thread head is lifted above the presser foot hole 21. When the next sewing is performed, no excess thread head will be exposed to the outside at the needle starting position.

[0025] In this embodiment, if Figure 4 As shown, the thread sweeping roller 45 is L-shaped, one end of the thread sweeping roller 45 is mounted on the transmission shaft 44, and the other end sweeps the gap between the presser foot 2 and the sewing needle 3.

[0026] Specifically, the longer end of the thread sweeping rod 45 is installed on the transmission shaft 44 and is located on one side of the needle 2. When sweeping the thread, the shorter end of the thread sweeping rod 45 passes through the gap between the needle 21 and the presser foot hole 21, thereby sweeping the thread end originally located in the presser foot hole 21 out of the presser foot hole 21.

[0027] In this embodiment, if Figures 1 to 3 As shown, a needle driving mechanism 5 is provided in the machine head 1, and the needle driving mechanism 5 is used to drive the needle 3 to move up and down. The needle driving mechanism 5 is used to move the needle 3 up and down.

[0028] Specifically, the needle drive mechanism 5 includes a drive motor 51, a cam 53 and a connecting rod 54; the needle 3 is mounted on the needle bar 57, the needle bar 57 is movably mounted in the needle bar sleeve 58, and the needle bar sleeve 58 is mounted in the machine head 1; the drive motor 51 is used to drive the cam 53 to rotate, the two ends of the connecting rod 54 are respectively hinged with the cam 53 and the needle bar 57, and the drive motor 51 is electrically connected to the drive cylinder 41. The drive motor 51 and the cam 53 are connected through a connecting shaft 52, and the needle bar 57 is mounted with a connecting sleeve 56, and the connecting sleeve 56 is hingedly connected to the connecting rod 54. A sliding assembly 55 is arranged in the machine head 1, and the sliding assembly 55 includes a slide rail and a slider, the slide rail is mounted on one side of the needle bar 57, the slider is slidably mounted in the slide rail, a thread take-up lever is arranged between the slider and the connecting sleeve 56, and the connecting rod 54 is hingedly connected to the thread take-up lever.

[0029] When in use, the two ends of the thread take-up rod are connected to the connecting sleeve 56 and the slider respectively. The slider can slide up and down along the slide rail, and the thread take-up rod is guided by the sliding assembly 55. The driving motor 51 drives the cam 53 to rotate through the connecting shaft 52, and the cam 53 drives the thread take-up rod to slide up and down along the slide rail through the connecting rod 54, thereby driving the needle bar 57 to slide up and down in the needle bar sleeve 58.

[0030] When sweeping the thread, the driving motor 51 drives the needle 3 to move up to above the presser foot hole 21, and then drives the piston rod of the cylinder 41 to extend, driving the thread sweeping rod 45 to sweep across the gap between the needle 3 and the presser foot hole 21, and lifts the thread end to the outside of the presser foot hole 21, and then drives the piston rod of the cylinder 41 to contract, driving the thread sweeping rod 45 back to the initial position.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0033] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A thread-wiping mechanism for a sewing machine, the sewing machine comprising a machine head (1) and a presser foot (2) and a sewing needle (3) arranged in the machine head (1); Features: A line sweeping mechanism (4) is also provided in the machine head (1), and the line sweeping mechanism (4) comprises a driving cylinder (41), a gear rack assembly and a line sweeping roller (45) which are connected in sequence; The driving cylinder (41) drives the thread sweeping rod (45) to reciprocate through the gear rack assembly, so that the thread sweeping rod (45) sweeps the gap between the presser foot (2) and the sewing needle (3).

2. A thread-wiping mechanism for a sewing machine according to claim 1, characterized in that: The gear rack assembly comprises a transmission rack (42), a transmission gear (43) and a transmission shaft (44); The movable end of the driving cylinder (41) is provided with a transmission rack (42), the transmission shaft (44) is rotatably mounted on one side of the needle (3), the transmission shaft (44) is provided with a transmission gear (43), the transmission gear (43) and the transmission rack (42) are meshed with each other, and the thread sweeping roller (45) is mounted on the transmission shaft (44).

3. A thread-wiping mechanism for a sewing machine according to claim 2, characterized in that: The thread sweeping rod (45) is L-shaped, one end of the thread sweeping rod (45) is mounted on the transmission shaft (44), and the other end sweeps the gap between the presser foot (2) and the sewing needle (3).

4. A sewing machine thread sweeping mechanism according to claim 1, characterized in that: A needle driving mechanism (5) is arranged in the machine head (1), and the needle driving mechanism (5) is used to drive the needle (3) to move up and down.

5. A thread-wiping mechanism for a sewing machine according to claim 4, characterized in that: The needle driving mechanism (5) comprises a driving motor (51), a cam (53) and a connecting rod (54); The needle (3) is mounted on a needle bar (57), the needle bar (57) is movably sleeved in a needle bar sleeve (58), and the needle bar sleeve (58) is mounted in a machine head (1); The driving motor (51) is used to drive the cam (53) to rotate. The two ends of the connecting rod (54) are respectively hinged to the cam (53) and the needle rod (57). The driving motor (51) is electrically connected to the driving cylinder (41).

6. A thread-wiping mechanism for a sewing machine according to claim 5, characterized in that: The driving motor (51) and the cam (53) are connected via a connecting shaft (52); a connecting sleeve (56) is sleeved on the needle rod (57); and the connecting sleeve (56) is hingedly connected to the connecting rod (54).

7. A thread-wiping mechanism for a sewing machine according to claim 6, characterized in that: A sliding assembly (55) is arranged in the machine head (1), and the sliding assembly (55) comprises a slide rail and a slider, the slide rail is installed on one side of the needle bar (57), the slider is slidably installed in the slide rail, a thread take-up lever is arranged between the slider and the connecting sleeve (56), and the connecting rod (54) is hingedly connected to the thread take-up lever.

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