Disassembling Sewing Machine: Key Components
a. Unveiled Source of Power: Drive System
Energy for the sewing machine is derived from its drive system, mainly composed of components such as motors, belts, clutches, among others. Generally, the motor is situated at the base of the sewing machine bed, serving as the primary power supply for all sewing machine operations. The procedure converts electrical power into mechanical energy, resulting in rotational force. Commonly made of rubber or leather, this belt acts as an essential link between the motor and different components. Through the application of friction and tension, the power of the motor is transferred to the other components of the sewing machine, aiding in power transfer. For example, when the motor starts turning, the belt's movement synchronizes with the motor's turn, thereby driving the transmission shaft connected to the belt into rotation. In the drive system's transmission system, the clutch is crucial for managing both the start stop and the speed control. Typically, a sewing machine clutch takes the shape of a foot pedal, which the user manipulates by varying the foot pedal's pressure. Pressing the pedal completely activates the clutch, enabling complete transmission of the motor's power to every part of the sewing machine, thus accelerating its operation; a gentle press on the pedal results in partial clutch engagement, reduced power transmission, and a decrease in the sewing machine's speed. This technique allows users to adjust the sewing machine's power and speed flexibly to suit their specific sewing requirements.
b. Core Soul: Sewing Device
The sewing device is the core component of a sewing machine, responsible for the key task of forming needle and thread and performing sewing. It mainly consists of a needle bar, needle plate, rocker, and thread action mechanism. The needle bar is an important component that controls the lifting of the needle and guides the thread into the needle hole to form a needle thread. It is connected to the power supply by joystick and transmission device, and is driven up and down by the power supply. As the sewing machine works, the needle bar moves down with the sewing needle, through the needle holes in the needle plate, introducing the thread into the fabric, completing the puncture, and then the needle bar goes up, preparing for the next puncture. This cycle achieves fabric sewing. A pin plate is a metal plate fastened to the base of a sewing head with needle holes and guide grooves. The pinhole provides a channel for the needle needle rod to pass through the fabric smoothly, and the guide groove plays an important role in guiding the movement of the fabric during the sewing process, ensuring the accuracy and stability of the sewing by sewing in the intended direction and position. The lever is used as the lever connecting the needle bar and the transmission device. When the transmission device drives the lever, the power is transferred to the needle rod and the needle bar moves up and down accordingly, thus forming the needle thread. Threaded action mechanism is used to control the feed and tension of the thread, so as to the bending, restore and stretch the thread, and promote the thread to enter the pinhole smoothly, forming a stable and reliable thread. For example, when a thicker fabric is sewn, the thread action mechanism automatically increases the tension of the thread to ensure that it is firmly sewn into the fabric. When a lightweight fabric is sewn, the thread action mechanism reduces the tension of the thread appropriately to avoid damaging the fabric. Accurate control of sewing thread through thread-acting mechanism can effectively ensure the quality of sewing and meet the requirements of different fabrics and sewing needs.
c. Precise Control: Control System
The control system is the "brain" of the sewing machine, used to control the operation of the sewing machine and various parameters during the sewing process, usually including switches, electronic chips, display screens, and other components. A switch is a component that controls the start and stop of a sewing machine, commonly found in pedal switches and manual switches. The pedal switch facilitates users to control the start and stop of the sewing machine by stepping on the fabric with both hands, making the operation more convenient and efficient; The manual switch can be used to manually turn on or off the sewing machine when needed. The electronic chip is the core of the control system, like the central processing unit of a computer, which can receive signals from switches, foot pedals, and other components, and convert these signals into commands to control the operation of the sewing machine, achieving precise control of various functions of the sewing machine. For example, an electronic chip can control the speed of the motor and the frequency of needle movement according to the parameters set by the user, such as needle bar and sewing speed, to ensure that the sewing machine operates according to user's requirements. The screen is used to display various parameters and working conditions of the sewing machine, such as needle spacing, sewing speed, thread tension, residual power, etc. Users can monitor the operation of sewing machine in real time through the display screen, intuitively understand the working state of sewing machine, and adjust and control accordingly according to actual needs. For example, if a user finds the stitching too fast or too slow, they can easily adjust the sewing speed with the operation buttons on the screen for optimal sewing effect. In addition, some advanced sewing machine control systems have intelligent fault diagnosis functions. When the sewing machine malfunctions, the display screen will promptly show the fault code and related prompt information, helping users quickly locate and solve problems, improve work efficiency, and reduce maintenance time and costs.
Exploring Operation: Detailed Explanation of Sewing Machine Workflow
a. Start up and power transmission
When the user presses the start switch of the sewing machine or steps on the foot pedal switch, the motor starts to power on and operate. The shaft of the motor begins to rotate at high speed, and the rotational power generated is first transmitted to the pulley closely connected to the motor shaft. The pulley rotates at high speed, and the belt fitted on it is also driven. Due to the tight fit between the belt and the pulleys on other parts of the sewing machine, power is smoothly transmitted to these pulleys through the friction and tension of the belt. These pulleys are connected to different drive shafts, which in turn drive the drive shafts to rotate. For example, one of the drive shafts is connected to the needle bar drive mechanism of the sewing machine, providing power for the up and down movement of the needle bar; The other transmission shaft is connected to the fabric feeding mechanism, driving the fabric feeding teeth to move forward and backward, achieving the fabric feeding function. Through such a series of transmission processes, the electrical energy of the motor is successfully converted into the mechanical energy of various working components of the sewing machine, providing a power foundation for the sewing operation.
b. Stitch Collaboration between needle and thread creates a stitch
After the sewing machine is started and power transmission is completed, the needle bar starts to reciprocate up and down under the drive of power. When the needle bar moves downwards with the sewing needle, the needle tip quickly passes through the pinhole on the needle plate and pierces into the fabric below. At this point, the thread carried by the sewing needle also passes through the fabric. During the process of the needle shaft rising, the needle will leave a small hole on the fabric, and the thread will form a coil. At the bottom of the sewing machine, the shuttle moves in a circular motion driven by the corresponding mechanism. When the needle bar rises and the coil formed by the upper thread is exposed on the surface of the fabric, the shuttle tip on the shuttle will accurately hook this coil. As the shuttle continues to rotate, the bottom line carried by the shuttle is pulled into the coil formed by the upper line. Then, the needle bar descends again, carrying the upper thread through the fabric, while pulling the lower thread upwards to interweave the upper and lower threads in the middle of the fabric, forming a complete stitch.
At the same time as the needle and thread collaborate to form a stitch, the fabric feeding mechanism also works synchronously. The feeding teeth are located below the needle plate and are connected to the transmission shaft to perform forward and backward reciprocating motion under the drive of power. When the needle bar rises and leaves the fabric, the feeding teeth will lift upwards, slightly lifting the fabric. Subsequently, the feeding teeth move forward to push the fabric forward a certain distance. The distance driven by the feeding teeth determines the size of the needle spacing, and the needle pitch adjustment device on the sewing machine can adjust the needle pitch. When the feeding tooth completes the forward thrust, it drops and releases the feed, then moves back to its starting position in preparation for the next feed. In this cycle, the feeding teeth carry the fabric forward continuously, and with the movement of the thread, a continuous and neat stitch is formed on the fabric to complete the sewing process.