Thread loosening device and sewing machine

Abstract

The utility model relates to the field of sewing machine thread loosening control, and discloses a thread loosening device and a sewing machine. One end of the control wire is a control end connected with the wire loosening part, and the other end of the control wire is a fixed end fixedly connected below the base; the thread loosening part can be pulled by pulling the control thread; the wire pulling part acts on the control wire, and the wire pulling part controls the control wire and relieves control over the control wire through reciprocating motion; the base is used for installing the control line and the line pulling part, the fixed end is fixed below the base, the line pulling part is fixedly installed below the base, the line pulling part comprises a rotating shaft and a swing arm arranged on the rotating shaft, the control line is located on the path through which the pull arm swings, and when the swing arm swings to act on the control line, the control end of the control line can be pulled to control the line loosening part. The thread loosening device has the advantages of being convenient to install and maintain, long in service life and the like.

Description

Technical Field

[0001] The utility model relates to the field of sewing machines, in particular to a thread loosening device and a sewing machine. Background Art

[0002] Chinese patent CN202220474368.1 discloses a thread trimming and loosening mechanism of a sewing machine and a sewing machine having the mechanism, wherein the thread trimming mechanism and the thread loosening mechanism use a motor to drive a cam mechanism, and then drive a thread loosening seat and a thread trimming shaft to rotate to achieve thread loosening and thread trimming. In this solution, the thread loosening seat is installed at the cam end and connected to the loosening and trimming crank. At the same time, a thread trimming mounting seat is also provided in this area. The space in this part is small and installation and maintenance are inconvenient. This solution provides a new type of thread loosening device based on the existing design. Utility Model Content

[0003] The utility model aims at the shortcomings of the prior art and provides a wire loosening device.

[0004] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0005] A wire loosening device comprises a control wire, a wire pulling part and a base;

[0006] The control line has one end connected to the loose wire part as the control end, and the other end fixedly connected to the bottom of the base as the fixed end; the loose wire part can be pulled by pulling the control line;

[0007] A wire pulling part acts on the control wire, and controls and releases the control wire through reciprocating motion;

[0008] The base is used to install the control line and the wire pulling part, the fixed end is fixed below the base, and the wire pulling part is fixedly installed below the base;

[0009] The wire pulling part comprises a rotating shaft and a swing arm arranged on the rotating shaft. The control wire is located on a path through which the pulling arm swings. When the swing arm swings on the control wire, the control end of the control wire can be pulled to control the wire loosening part.

[0010] Preferably, the rotating shaft is mounted on the base through a mounting seat, and a notch is provided on the side of the swing arm facing the control line, and the control line falls into the notch during operation.

[0011] Preferably, the notch is an arc-shaped notch, and the connection between the end of the notch and the swing arm is an arc transition.

[0012] Preferably, the fixed end includes a wire core and a locking sleeve arranged on the outside of the wire core, and also includes a fixing ear, which is fixed to the base by bolts or screws, and a through hole is provided on the fixing ear, the locking sleeve passes through the through hole, and a locking nut is provided on the locking sleeve, the locking nut includes a left nut located on the left side of the through hole and a right nut located on the right side of the through hole, and the locking sleeve is fixedly connected to the fixing ear through the left nut and the right nut.

[0013] Preferably, the swing arm includes a sleeve and an arm body, the sleeve and the arm body are fixedly connected, the sleeve is sleeved on the rotating shaft, a locking threaded hole is provided on the sleeve, and the sleeve is fixedly connected to the rotating shaft by a locking screw installed in the locking threaded hole.

[0014] Preferably, it further comprises a supporting ear, a guiding groove for guiding the control line is formed in the supporting ear, and the supporting ear is fixedly connected to the bottom of the base.

[0015] A sewing machine comprises the above-mentioned thread loosening device.

[0016] The utility model adopts the above technical solution, and has the following significant technical effects:

[0017] The wire loosening mechanism designed by the utility model is arranged below the base, and has the advantages of convenient installation, simple debugging and subsequent maintenance, and the transmission driven by the rotating shaft has the advantages of stable and reliable control. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the device.

[0019] Figure 2 It is a schematic diagram of the overall structure of the device without the base.

[0020] Figure 3 It is a schematic diagram of the overall structure of the device.

[0021] Figure 4 It is a structural diagram of the swing arm.

[0022] The technical names of the accompanying drawings are: 1-control line, 2-wire pulling part, 3-base, 5-loose wire part, 6-fixed end, 7-rotating shaft, 8-swing arm, 9-notch, 10-locking sleeve, 11-fixing ear, 12-through hole, 13-locking nut, 14-sleeve body, 15-arm body, 16-support ear, 17-guide groove. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] Example 1

[0025] A wire loosening device comprises a control wire 1, a wire pulling part 2 and a base 3;

[0026] The control line 1 has one end connected to the loose wire part 5 as the control end, and the other end fixedly connected to the bottom of the base 3 as the fixed end 6; the loose wire part 5 can be pulled by pulling the control line 1;

[0027] The wire pulling part 2 acts on the control wire 1, and the wire pulling part 2 controls and releases the control wire 1 through reciprocating motion;

[0028] The base 3 is used to install the control line 1 and the wire pulling part 2, the fixed end 6 is fixed below the base 3, and the wire pulling part 2 is fixedly installed below the base 3;

[0029] The wire pulling part 2 includes a rotating shaft 7 and a swing arm 8 arranged on the rotating shaft 7. The control wire 1 is located on the path through which the pulling arm swings. When the swing arm 8 swings and acts on the control wire 1, the control end of the control wire 1 can be pulled to control the wire loosening part 5. The wire loosening mechanism principle and the wire cutting mechanism principle in this scheme are similar to the background technology. The focus of this scheme is on the design of the wire loosening mechanism. The wire loosening operation is achieved by rotating the swing arm 8 to pull the control wire 1, which has the advantages of stable and reliable transmission and not easy to deform. In addition, the swing arm 8 has a certain width, which increases the contact area with the control wire 1 and reduces the damage to the control wire 1.

[0030] In this embodiment, the rotating shaft 7 is mounted on the base 3 through a mounting seat, and a notch 9 is provided on the side of the swing arm 8 facing the control line 1. When working, the control line 1 falls into the notch 9. One end of the rotating shaft 7 is driven by a motor 19, and the motor 19 drives the rotating shaft 7 to rotate through a cam mechanism 20 and a connecting rod mechanism 21. When the rotating shaft 7 rotates, the swing arm 8 is driven to move.

[0031] The notch 9 is an arc-shaped notch, and the end of the notch 9 is connected to the swing arm 8 in an arc transition. The purpose of setting the notch 9 is to limit the control line 1 and ensure the stable contact between the control line 1 and the swing arm 8.

[0032] Secondly, the fixed end 6 includes a wire core and a locking sleeve 10 disposed outside the wire core, and also includes a fixing ear 11, which is fixed to the base 3 by bolts or screws, and a through hole is provided on the fixing ear 11, through which the locking sleeve 10 passes, and a locking nut 13 is provided on the locking sleeve 10, the locking nut 13 includes a left nut located on the left side of the through hole and a right nut located on the right side of the through hole, and the locking sleeve 10 is fixedly connected to the fixing ear 11 by the left nut and the right nut. Since the control line 1 needs to be pulled, one end of the control line 1 needs to be fixed, and the advantages of using this fixing method are reliable installation and convenient adjustment of the tightness of the control line 1.

[0033] The swing arm 8 includes a sleeve 14 and an arm 15, the sleeve 14 and the arm 15 are fixedly connected, the sleeve 14 is sleeved on the rotating shaft 7, a locking threaded hole 18 is provided on the sleeve 14, and the sleeve 14 is fixedly connected to the rotating shaft 7 by a locking screw installed in the locking threaded hole 18. The sleeve 14 and the arm 15 are an integrally formed structure, and the sleeve 14 is sleeved on the rotating shaft 7. This structure has the advantages of simple installation and simple adjustment.

[0034] In order to ensure the stability of the swing control process of the control line 1, the support ear 16 is also included. The support ear 16 is used to guide and support the control line 1, ensuring that the state of the entire control line 1 is controllable during the swing arm 8 pulling the control line 1. At the same time, the guidance of the support ear 16 can also facilitate the stable return process of the control line 1. A guide groove 17 for guiding the control line 1 is formed in the support ear 16, and the support ear 16 is fixedly connected to the bottom of the base 3.

[0035] The working process of this program is as follows:

[0036] The motor 19 drives the cam mechanism 20 to rotate, and the cam mechanism 20 drives the rotating shaft 7 to swing back and forth through the connecting rod mechanism 21. When swinging inward, the swing arm 8 acts on the control line 1, thereby controlling and pulling the control line 1, and the control line 1 performs a line loosening action. When the swing arm 8 swings outward, the control line 1 returns to its original position under the action of the torsion spring of the line loosening part 5.

[0037] Example 2

[0038] The difference between this embodiment and the first embodiment is that the number of the locking threaded holes 18 is two.

[0039] Example 3

[0040] A sewing machine, comprising a thread loosening device as described in Example 1.

Claims

1. A wire loosening device, characterized in that: It comprises a control line (1), a wire pulling part (2) and a base (3); A control line (1) has one end as a control end connected to a loose line portion (5), and the other end as a fixed end (6) fixedly connected to the bottom of the base (3); the loose line portion (5) can be pulled by pulling the control line (1); A wire pulling part (2) acts on the control wire (1), and the wire pulling part (2) controls the control wire (1) and releases the control wire (1) through reciprocating motion; A base (3) is used to install the control line (1) and the wire pulling part (2), the fixed end (6) is fixed below the base (3), and the wire pulling part (2) is fixedly installed below the base (3); The wire pulling part (2) comprises a rotating shaft (7) and a swing arm (8) arranged on the rotating shaft (7); the control wire (1) is located on a path through which the pulling arm swings; when the swing arm (8) swings on the control wire (1), the control end of the control wire (1) can be pulled to control the wire loosening part (5).

2. A wire loosening device according to claim 1, characterized in that: The rotating shaft (7) is mounted on the base (3) via a mounting seat, and a notch (9) is provided on the side of the swing arm (8) facing the control line (1), and the control line (1) falls into the notch (9) during operation.

3. A wire loosening device according to claim 2, characterized in that: The notch (9) is an arc-shaped opening, and the connection between the end of the notch (9) and the swing arm (8) is an arc transition.

4. A wire loosening device according to claim 2, characterized in that: The fixed end (6) comprises a wire core and a locking sleeve (10) arranged outside the wire core, and also comprises a fixing ear (11), the fixing ear (11) is fixed to the base (3) by means of bolts or screws, a through hole is provided on the fixing ear (11), the locking sleeve (10) passes through the through hole, a locking nut (13) is arranged on the locking sleeve (10), the locking nut (13) comprises a left nut located on the left side of the through hole and a right nut located on the right side of the through hole, and the locking sleeve (10) is fixedly connected to the fixing ear (11) by means of the left nut and the right nut.

5. A wire loosening device according to claim 1, 2, 3 or 4, characterized in that: The swing arm (8) comprises a sleeve body (14) and an arm body (15), wherein the sleeve body (14) and the arm body (15) are fixedly connected, the sleeve body (14) is sleeved on the rotating shaft (7), a locking threaded hole (18) is arranged on the sleeve body (14), and the sleeve body (14) is fixedly connected to the rotating shaft (7) via a locking screw installed in the locking threaded hole (18).

6. A wire loosening device according to claim 4, characterized in that: The invention also comprises a supporting ear (16), a guide groove (17) for guiding the control line (1) is formed in the supporting ear (16), the supporting ear (16) is fixedly connected to the bottom of the base (3), and the swing arm (8) is located between the supporting ear (16) and the fixing ear (11).

7. Sewing machine, characterized in that: A wire loosening device comprising any one of claims 1 to 6.

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