Take-up mechanism and sewing machine

Abstract

The utility model provides a take-up mechanism and a sewing machine. The take-up mechanism is arranged on a thread feeding path between a bobbin and a sewing needle at a machine head of the sewing machine and comprises a thread clamping device and a take-up device. A sewing thread led out of the bobbin sequentially penetrates through the thread clamping device and the take-up device and then is sent out to the sewing needle. The thread clamping device can be controlled to clamp a sewing thread and lock movement of the sewing thread, and the take-up device can enable a thread feeding path to be bent through movement of the take-up device when the sewing thread is locked by the thread clamping device so as to enable a thread head of the sewing thread to retract. According to the take-up mechanism, when one end of a sewing thread is locked by the thread clamping device, the length of a thread feeding path is increased through the action of the take-up device, so that a thread end at a sewing needle retracts and absorbs the length of the thread end exposed at the sewing needle, and the defect that the thread end is too long to wind during needle starting is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing equipment, and particularly relates to a thread take-up mechanism and a sewing machine. Background Art

[0002] In the sewing operation of using a sewing machine, it is easy to cause material waste due to too long thread ends, and manual trimming is required later.

[0003] Whether in a sewing machine with an automatic thread cutting function with a high degree of automation or in a sewing machine that requires manual thread cutting, in order to take out the sewing fabric and re-insert the needle, the thread end needs to be cut. The general operation during cutting requires moving the fabric out, and then cutting the sewing thread in such a way that the thread end left on the fabric is as short as possible. In this way, the too long sewing thread released due to the movement of the fabric will concentrate on the thread end at the sewing machine head. When sewing again, the extra thread ends will accumulate in a group at the needle insertion position and be wound around the needle feet during the sewing process to form a bird's nest, affecting the appearance of the finished product. Summary of the Utility Model

[0004] In order to avoid the phenomenon of thread ends forming a bird's nest during the sewing operation and affecting the appearance of the sewn finished product, the present application provides a thread take-up mechanism and a sewing machine.

[0005] The technical solution of the utility model provides a thread take-up mechanism, which is arranged on the thread feeding path between a bobbin and a sewing needle at the head of a sewing machine, and includes a thread clamp and a thread take-up device. The sewing thread led out from the bobbin sequentially passes through the thread clamp and the thread take-up device and then is sent out to the sewing needle. The thread clamp can be controlled to clamp the sewing thread and lock the movement of the sewing thread. When the sewing thread is locked by the thread clamp, the thread take-up device can make the thread feeding path bend through its own movement, so as to retract the thread end of the sewing thread.

[0006] Preferably, the thread clamp includes two groups of pressing plates arranged opposite to each other and capable of relative displacement. A channel for the movement of the sewing thread is formed in the space between the opposite surfaces of the two groups of pressing plates. When the two groups of pressing plates are pressed together, the sewing thread is locked, and when the two groups of pressing plates are opened, the sewing thread is released.

[0007] Preferably, at least one of the two groups of pressing plates is formed with two adjacent protrusions, so as to form a thread groove between the two adjacent protrusions. The thread groove is used for threading the sewing thread.

[0008] Preferably, the thread groove is located at the edge of the pressing plate. When the two groups of pressing plates are displaced relative to each other, there is an overlap in height between the protrusion and the other pressing plate to ensure that the thread groove is closed by the pressing plates.

[0009] Preferably, both the protrusion and the thread groove are formed on the two opposite side edges of the pressing plate.

[0010] Preferably, the thread take-up device includes a sliding rod slidably disposed on the sewing machine. One end of the sliding rod is provided with a perforation for the sewing thread to pass through. When the sliding rod slides, the feeding path is bent due to the movement of the perforation, causing the end of the sewing thread to retract.

[0011] Preferably, the sliding rod is provided with a pivot. The thread take-up device further includes a swing arm fixedly disposed on the output shaft and provided with a sliding groove. The pivot is slidably disposed in the sliding groove.

[0012] Preferably, the thread take-up device further includes a limiting block disposed on the base of the thread take-up device, and the limiting block is used to limit the swing angle of the swing arm.

[0013] Preferably, the thread take-up mechanism further includes a wire presser for adjusting the resistance of the sewing thread conveyance. The wire presser has a winding shaft around which the sewing thread bypasses, and the sewing thread winds less than one turn around the winding shaft. The wire presser has a knob coaxially disposed with the winding shaft, and the knob is used to adjust the conveyance resistance of the winding shaft to the sewing thread.

[0014] The technical solution of the present invention further provides a sewing machine, including the thread take-up mechanism described in any one of the above.

[0015] The thread take-up mechanism of the present invention realizes the control of the extension amount of the sewing thread through the cooperatively arranged thread clamp and thread take-up device. The specific method is that when the thread clamp locks one end of the sewing thread, the action of the thread take-up device causes the length of the feeding path to become longer, so that the end of the thread at the sewing needle retracts, absorbing the length of the thread exposed at the sewing needle, thereby avoiding the defect of too long thread at the start of sewing caused by too long thread. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an installation schematic diagram of the thread take-up mechanism of the present invention;

[0017] Figure 2 is a structural schematic diagram of the thread take-up mechanism of the present invention;

[0018] Figure 3 is an exploded schematic diagram of the thread clamp 11 of the present invention;

[0019] Figure 4 is a principle schematic diagram of the thread clamp 11 of the present invention;

[0020] Figure 5 is a structural schematic diagram of the thread take-up device 12 of the present invention;

[0021] Figure 6 is a schematic diagram of another embodiment of the thread take-up mechanism 1 of the present invention.

[0022] In the figure:

[0023] 1: Take-up mechanism; 11: Thread clamp; 111: First pressing plate; 112: Second pressing plate; 11D: Protruding part; 11E: Thread routing groove; 12: Take-up reel; 13: Wire presser; 131: Inlet hole; 132: Outlet hole; 133: Winding shaft; 134: Knob; 2: Bobbin; 21: Slide bar; 211: Pivot; 212: Perforation; 22: Limit block; 23: Swing arm; 231: Slide groove; 3: Machine head; R: Wire feeding path. Detailed implementation mode

[0024] The following combines the attached drawings and specific embodiments to elaborate in detail on the type of this patent. In this specification, the dimensions of the attached drawings do not represent the actual dimensional ratios. The attached drawings are only used to reflect the relative positional relationship and connection relationship between components. Components with the same name or the same reference numeral represent similar or identical structures, and are for illustrative purposes only.

[0025] Figure 1 This is an installation schematic diagram of the take-up mechanism of this application. This take-up mechanism is installed on a sewing machine. For the thread feeding path of the sewing machine, the sewing thread is generally led out from the rotatable bobbin 2 and then conveyed to the sewing needle of the machine head 3, thus forming a wire feeding path from the bobbin 2 to the machine head 3. The take-up mechanism 1 is arranged on the wire feeding path between the bobbin 2 and the machine head 3. It controllably retracts the thread end at the machine head 3 through the movement of components, causing the thread end to retract as mentioned in the background art, leaving only an appropriate length exposed at the front end of the sewing needle.

[0026] Figure 2This is a schematic structural diagram of the wire take-up mechanism of the present application. The wire take-up mechanism 1 includes a thread clamp 11 and a wire take-up device 12, both of which are arranged on the wire feeding path R between the bobbin 2 and the machine head 3. The sewing thread drawn from the bobbin 2 passes through the thread clamp 11 and the wire take-up device 12 in sequence and then is sent out to the machine head 3. Among them, the thread clamp 11 can be controlled to clamp the sewing thread so that there is no relative displacement between the sewing thread and the thread clamp 11, while the wire take-up device 12 can drive the sewing thread passing through it to move through its own relative movement. During the wire take-up process, the following process is controlled: the thread clamp 11 clamps the sewing thread, and the wire take-up device 12 is driven to move. At this time, since one end of the sewing thread is clamped by the thread clamp 11, on the side where the wire take-up device 12 is provided, the movement of the wire take-up device 12 will cause the wire feeding path R of the sewing thread to bend. Then, the thread end at the machine head 3 will retract due to the bending of the wire feeding path R, so that the thread end exposed on the sewing needle on the machine head 3 is shortened, thereby achieving the purpose of adjusting the thread end length before starting the needle. Since it can ensure that the length of the thread end is at a more appropriate length when starting the needle, there will be no problem of winding and accumulation caused by too long thread end at the starting position of the sewing stitch. At the same time, the appropriate exposed length of the thread end can also ensure that the thread end will not come out of the needle hole of the sewing machine during the starting action, ensuring the reliable execution of the sewing task.

[0027] Figure 3 This is an exploded schematic diagram of the thread clamp 11. Figure 5 This is a schematic structural diagram of the wire take-up device 12. The thread clamp 11 includes two pressure plates 111 that are oppositely arranged and can be displaced relative to each other. A channel for the sewing thread to move is formed in the space between the two opposite surfaces of the pressure plates 111. On at least one of the pressure plates 111, two adjacent protrusions 11D are formed, so that a wire groove 11E is formed between the two adjacent protrusions 11D. In a preferred solution, the protrusions 11D are formed on the pressure plate 111 or the edge of the pressure plate 111 so as not to interfere with the pressing between the opposite surfaces of the pressure plates 111. Further, the wire groove 11E defined by the two protrusions 11D can be formed on the pressure plate 111 or the two edges of the pressure plate 111 to cover the entrance and exit of the sewing thread movement channel.

[0028] As Figure 4 shown, when the pressure plate 111 is in normal use, as Figure 4As shown in (b), since the relative distance that the pressing plate 111 moves away is limited, there is a height overlap between the protruding portion 11D and the pressing plate 111 in the direction of relative movement. Thus, the inlet and outlet of the sewing thread are defined by the protruding portion 11D and the pressing plate 111. During the relative movement of the pressing plate 111, the circumferences of the inlet and outlet always remain annularly closed, which can keep the sewing thread always restricted within the channel defined by the pressing plate 111 and prevent it from slipping out. When it is necessary to clamp the sewing thread so that the sewing thread is fixed on the thread clamp 11, the pressing plate 111 is pressed against the pressing plate 111 with a certain pressing force, pressing the sewing thread tightly within the channel, and preventing the conveyance of the sewing thread through the frictional force of the relative surfaces on the sewing thread.

[0029] As Figure 5 The structure schematic diagram of the thread take-up device 12 is shown as follows. It includes a sliding rod 21 slidably arranged on the sewing machine main body. One end of the sliding rod 21 has a perforation 212 for the sewing thread to pass through. The moving direction of the sliding rod 21 should form a certain angle with the conveying direction of the sewing thread, and at least should not be parallel to the sewing path of the sewing thread, so as to ensure that when the sliding rod 21 moves, the sewing path of the sewing thread is always bent due to the movement of the perforation 212. At this time, limited by the bending of the sewing path, the line length on the path increases. If the thread clamp 11 clamps the sewing thread, the increased line length can only be compensated by the retraction of the sewing thread end at the head end of the machine, thereby achieving the purpose of taking up the thread and shortening the thread end.

[0030] Preferably, a pivot 211 is arranged on the sliding rod 21, and the pivot 211 can be configured at the other end of the sliding rod 21 relative to the perforation 212. The bobbin 2 further includes a driving device, such as a servo motor. A swing arm 23 is arranged on the output shaft of the driving device. A chute 231 is arranged on the swing arm 23, and the chute 231 can be a long groove extending along the arm. The pivot 211 is placed to slide within the chute 231. When the swing arm 23 swings, the sliding rod 21 is driven to reciprocate through the pivot 211 to change the position of the perforation 212, thereby achieving the practical goal of controlling the length of the thread end. Preferably, the thread take-up device 12 further includes a limiting block 22 arranged on the base of the bobbin 2, which is used to limit the maximum swing angle of the swing arm 23. The swing arm 23 can generally be made of rubber material to provide a certain buffer for the movement of the swing arm 23. Preferably, the swing arm 23 can be adjusted in position on the base to change the maximum swing angle of the swing arm 23 during limiting.

[0031] As Figure 6The illustrated embodiment. The take-up mechanism 1 further includes a wire presser 13 for adjusting the resistance of the sewing thread conveyance. The wire presser 13 has a winding shaft 133 around which the sewing thread bypasses, and an inlet hole 131 and an outlet hole 132 are provided around the winding shaft 133. The sewing thread penetrates through the inlet hole 131, winds less than one turn around the winding shaft 133, then changes direction and enters the outlet hole 132 and passes through it and enters the through hole 212 of the take-up device 12. A knob 134 is coaxially arranged on the winding shaft 133 for adjusting the resistance of the winding shaft 133 to the sewing thread. Specifically, in the prior art, the winding shaft 133 is usually provided with two pairs of opposed adjustable-gap circular rings, and a gap for winding the sewing thread is formed between the circular rings. Then, by adjusting the size of the gap through the relative displacement between the circular rings, the resistance to the sewing thread conveyance can be changed. Usually, the two circular rings are maintained open by an elastic member such as a spring, and the size of the opened gap is adjusted by the coaxially arranged knob 134. Therefore, the size of the gap and the conveyance resistance of the sewing thread can be controlled through the cooperation of the knob 134 and the elastic member.

[0032] The above content is only a description of the preferred embodiments of this patent type and does not limit the scope of this patent type. Without departing from the design spirit of this patent type, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of this patent type shall fall within the protection scope determined by the claims of this patent type.

Claims

1. A thread take-up mechanism, arranged on a thread feeding path between a thread drum (2) and a sewing needle at a head of a sewing machine, characterized in that: The invention comprises a thread clamp (11) and a thread take-up (12), wherein the thread take-up (12); a sewing thread drawn from a thread drum (2) passes through the thread clamp (11) and the thread take-up (12) in sequence and is then sent to a sewing needle; the thread clamp (11) can clamp the sewing thread in a controlled manner to lock the movement of the sewing thread; and the thread take-up (12) can bend the thread feeding path through its own movement when the sewing thread is locked by the thread clamp (11), thereby causing the thread end of the sewing thread to retract.

2. The wire take-up mechanism according to claim 1, characterized in that: The thread clamp (11) comprises two sets of pressing plates (111) which are arranged opposite to each other and can move relative to each other; a channel for the movement of the sewing thread is formed in the space between the opposite surfaces of the two sets of pressing plates (111); the sewing thread is locked when the two sets of pressing plates (111) are pressed against each other, and the sewing thread is released when the two sets of pressing plates (111) are opened.

3. The wire take-up mechanism according to claim 2, characterized in that: Two adjacent protrusions (11D) are formed on at least one of the two groups of pressing plates (111), so that a wire routing groove (11E) is formed between the two adjacent protrusions (11D); the wire routing groove (11E) is used for passing the sewing thread.

4. The wire take-up mechanism according to claim 3, characterized in that: The wiring groove (11E) is located at the edge of the pressing plate (111); when the two groups of pressing plates (111) are relatively displaced, there is a height overlap between the protruding portion (11D) and another pressing plate (111), so as to ensure that the wiring groove (11E) is closed by the pressing plate (111).

5. The wire take-up mechanism according to claim 3, characterized in that: The protruding portion (11D) and the wiring groove (11E) are both formed on two opposite sides of the pressing plate (111).

6. The wire take-up mechanism according to claim 1, characterized in that: The thread take-up device (12) comprises a slide bar (21) slidably arranged on the sewing machine, and a through hole (212) is arranged at one end of the slide bar (21) for the sewing thread to pass through; when the slide bar (21) slides, the thread feeding path is bent due to the movement of the through hole (212), so that the thread end of the sewing thread retracts.

7. The wire take-up mechanism according to claim 6, characterized in that: The slide bar (21) is provided with a pivot (211); the wire take-up device (12) further comprises a swing arm (23), the swing arm (23) is fixedly arranged on the output shaft and provided with a slide groove (231); the pivot (211) is slidably arranged in the slide groove (231).

8. The wire take-up mechanism according to claim 7, characterized in that: The wire take-up device (12) further comprises a limit block (22) arranged on a base of the wire take-up device (12), wherein the limit block (22) is used to limit the swing angle of the swing arm (23).

9. The wire take-up mechanism according to claim 1, characterized in that: The thread take-up mechanism (1) further comprises a thread presser (13) for adjusting the resistance of the sewing thread conveying, the thread presser (13) comprising a winding shaft (133) for the sewing thread to wind around, the sewing thread being wound around the winding shaft (133) for less than one turn; the thread presser (13) comprises a knob (134) coaxially arranged with the winding shaft (133), the knob (134) being used to adjust the resistance of the winding shaft (133) to the conveying of the sewing thread.

10. A sewing machine, characterized in that: It comprises a wire taking-up mechanism as described in any one of claims 1 to 9.

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