Tension adjusting device for sewing machine
By using a tension adjustment device of the motor-driven pull rod in the sewing machine, the existing solenoid valves have large errors, cumbersome debugging and large space occupancy, achieving more efficient and accurate tension adjustment and more convenient installation.
Patent Information
- Application Number
- CN202421813130.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-29
AI Technical Summary
The existing sewing machine tension adjustment device uses solenoid valves, which have problems such as large errors, cumbersome debugging and large space occupancy.
A motor is used to replace the traditional solenoid valve, and the axial movement of the pull rod is driven by the motor to adjust the opposite line tension. The device includes an axially movable pull rod, a tension seat, a tension end cap, a spring, an adjustment nut, a clamping gland, a core sleeve, a buffer torsion spring and a motor drive system.
It effectively reduces the errors of traditional solenoid valves when controlling the tie rod, improves debugging efficiency, reduces space consumption, and simplifies the installation process.
Smart Images
Figure CN222821842U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of sewing machines, in particular to a tension regulating device for sewing machines. Background Art
[0002] At present, during the sewing process, the upper thread often floats and the lower thread is entangled and bubbles appear. The main reason is that the tension of the upper thread is too loose. Usually, the tension value on the tension disk is adjusted, and then fine adjustments are made according to the thickness of the fabric and the thickness of the stitching until the stitches are straight and there are no bubbles.
[0003] However, the existing tension adjustment device often adopts the form of a solenoid valve, which has a large error and needs to be debugged many times during adjustment, which is time-consuming. At the same time, the overall space occupied by the solenoid valve is large. Summary of the invention
[0004] The utility model aims to provide a tension regulating device for a sewing machine, which utilizes a motor to replace a traditional electromagnetic valve, reduces occupied space, is accurate and convenient to debug, and is easy to install.
[0005] The purpose of the utility model is achieved in this way:
[0006] A tension adjustment device for a sewing machine comprises an axially movable pull rod, one end of the pull rod is sleeved with a tension seat, one side of the tension seat is provided with a tension end cover that slides along the height direction of the tension seat, and a plurality of springs are provided between the tension end cover and the tension seat, an adjusting nut for locking the tension end cover is threadedly connected to the end of the pull rod, two groups of thread clamping covers that abut against the tension seat are sleeved on the pull rod, the other side of the two thread clamping covers is provided with a core sleeve sleeved on the pull rod, and a buffer torsion spring is provided between the core sleeve and the thread clamping cover, and the other end of the pull rod is provided with a motor for driving the pull rod to move along its length direction through a connecting group.
[0007] The utility model is further configured such that the connection group includes a "C"-shaped connection piece fixed to one end of the pull rod, and the other end of the connection piece is fixed to the motor shaft of the motor by means of bolts. When the motor drives the motor shaft to rotate, the pull rod is driven to move along its length direction.
[0008] The utility model is further configured that the motor is a screw motor.
[0009] The utility model is further configured as follows: the connection group includes a "C"-shaped connecting piece fixed to one end of the pull rod, one end of the connecting piece is fixed with a motor pull rod by means of bolts, one side of the motor is fixed with a motor angle bracket, the motor pull rod passes through one side of the motor angle bracket, the motor shaft of the motor passes through the other side of the motor angle bracket, a rocker arm is fixed to the end of the motor shaft, a connecting rod is hinged to the end of the rocker arm, the other end of the connecting rod is hinged to the end of the motor pull rod extending into the motor angle bracket, and when the driving motor swings the rocker arm, the pull rod moves along its length direction.
[0010] The utility model is further configured that the motor is a stepping motor.
[0011] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:
[0012] 1. The tension adjustment device provided by the utility model realizes the tension adjustment of the opposite line by the displacement of the pull rod by the motor, effectively reduces the error generated by the traditional electromagnet when controlling the pull rod, and improves the debugging efficiency.
[0013] 2. The utility model further uses a screw motor to control the movement of the pull rod, and the control is accurate with small error.
[0014] 3. The utility model further uses a stepper motor to control the movement of the pull rod, which facilitates the lateral installation and angle adjustment control of the motor and is suitable for more installation environments. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model;
[0016] Figure 2 It is an exploded schematic diagram of the first embodiment of the utility model;
[0017] Figure 3 It is a partial explosion schematic diagram of the second embodiment of the utility model;
[0018] Reference numerals:
[0019] 1- Pull rod;
[0020] 2-tension seat; 20-tension end cover; 21-spring; 22-adjusting nut; 23-clip wire gland; 24-core sleeve; 25-buffer torsion spring;
[0021] 3-connection group; 30-connecting piece; 31-motor pull rod; 32-swing rod; 33-connecting rod;
[0022] 4-motor; 40-motor angle bracket. DETAILED DESCRIPTION
[0023] The present invention will be further described below with reference to the accompanying drawings. Figure 1 — Figure 2 :
[0024] Embodiment 1:
[0025] A tension adjustment device for a sewing machine, comprising an axially movable pull rod 1, one end of the pull rod 1 is sleeved with a tension seat 2, one side of the tension seat 2 is provided with a tension end cover 20 that slides along the height direction of the tension seat, and a plurality of springs 21 are provided between the tension end cover 20 and the tension seat 2, an adjusting nut 22 for locking the tension end cover 20 is threadedly connected to the end of the pull rod 1, two groups of clamping wire pressure covers 23 that abut against the tension seat 2 are sleeved on the pull rod 1, the other side of the two clamping wire pressure covers 23 is provided with a core sleeve 24 sleeved on the pull rod 1, and a buffer torsion spring 25 is provided between the core sleeve 24 and the clamping wire pressure cover 23, and the other end of the pull rod 1 is provided with a motor 4 for driving the pull rod 1 to move along its length direction through a connecting group 3.
[0026] Preferably, the connection group 3 includes a "C"-shaped connecting piece 30 fixed to one end of the pull rod 1, and the other end of the connecting piece 30 is fixed to the motor shaft of the motor 4 by means of bolts. When the motor 4 drives the motor shaft to rotate, the pull rod 1 is driven to move along its length direction.
[0027] Preferably, the motor 4 is a screw motor.
[0028] The specific tension adjustment process is to wrap the surface thread around the two thread clamping covers 23, and the pull rod 1 drives the screw through the motor 4 to pull the connecting piece 30, thereby moving the pull rod 1 in the length direction to play a role in tension adjustment. The screw motor adjusts the screw distance accurately and the tension adjustment is convenient.
[0029] Embodiment 2:
[0030] like Figure 3 As shown, this embodiment is basically the same as the first embodiment, and the difference lies in that the connection group 3 includes a "C"-shaped connector 30 fixed to one end of the pull rod 1, and a motor pull rod 31 is fixed to one end of the connector by means of bolts, and a motor angle bracket 40 is fixed to one side of the motor 4, and the motor pull rod 31 passes through one side of the motor angle bracket 40, and the motor shaft of the motor 4 passes through the other side of the motor angle bracket 40, and a swing rod 32 is fixed to the end of the motor shaft, and a connecting rod 33 is hinged at the end of the swing rod 32, and the other end of the connecting rod 33 is hinged to the end of the motor pull rod 31 extending into the motor angle bracket 40, and when the driving motor 4 swings the swing rod 32, the pull rod 1 moves along its length direction.
[0031] Preferably, the motor 4 is a stepping motor.
[0032] In the above-mentioned specific implementation process, the surface thread is also wound around the two wire clamping covers. The difference is that the stepper motor only drives the motor shaft to rotate slightly. During the rotation, the rocker arm 32 is driven to rotate, and the connecting rod 33 drives the movement of the pull rod 31, thereby achieving different tensioning forces between the two wire clamping covers and realizing rapid adjustment of the tension. At the same time, the motor has low space requirements and is easy to install.
[0033] 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 tension adjustment device for a sewing machine, characterized in that: The invention comprises an axially movable pull rod (1), one end of which is sleeved with a tension seat (2), one side of the tension seat (2) is provided with a tension end cover (20) which slides along the height direction of the tension seat, and a plurality of springs (21) are provided between the tension end cover (20) and the tension seat (2), the end of the pull rod (1) is threaded with an adjusting nut (22) which locks the tension end cover (20), the pull rod (1) is sleeved with two groups of clamping covers (23) which abut against the tension seat (2), the other side of the two clamping covers (23) is provided with a core sleeve (24) sleeved on the pull rod (1), and a buffer torsion spring (25) is provided between the core sleeve (24) and the clamping cover (23), and the other end of the pull rod (1) is provided with a motor (4) which drives the pull rod (1) to move along its length direction through a connecting group (3).
2. A tension adjustment device for a sewing machine according to claim 1, characterized in that: The connection group (3) comprises a "C"-shaped connection piece (30) fixed to one end of the pull rod (1); the other end of the connection piece (30) is fixed to the motor shaft of the motor (4) by means of bolts; when the motor (4) drives the motor shaft to rotate, the pull rod (1) is driven to move along its length direction.
3. A tension adjustment device for a sewing machine according to claim 2, characterized in that: The motor (4) is a screw motor.
4. A tension adjustment device for a sewing machine according to claim 1, characterized in that: The connection group (3) includes a "C"-shaped connection piece (30) fixed to one end of the pull rod (1), one end of the connection piece is fixed with a motor pull rod (31) by means of bolts, one side of the motor (4) is fixed with a motor angle bracket (40), the motor pull rod (31) passes through one side of the motor angle bracket (40), the motor shaft of the motor (4) passes through the other side of the motor angle bracket (40), a swing rod (32) is fixed to the end of the motor shaft, a connecting rod (33) is hinged to the end of the swing rod (32), and the other end of the connecting rod (33) is hinged to the end of the motor pull rod (31) extending into the motor angle bracket (40), and when the driving motor (4) swings the swing rod (32), the pull rod (1) moves along its length direction.
5. A tension adjustment device for a sewing machine according to claim 4, characterized in that: The motor (4) is a stepping motor.