The method of marking cam synchronization
The maintenance of embroidery machine will inevitably encounter the cam synchronous marking. How to correctly mark the table and determine the time degree of the marking is very important. Dial indicator is a kind of measuring tool with high accuracy. It can only measure relative value, but not absolute value. It is mainly used to detect the shape and position error of workpiece (such as roundness, flatness, verticality, runout, etc.), and its measuring accuracy is 0.01mm. A simple, accurate and quick method of cam synchronous marking: first, align the pointer of the machine with the dial between 172 & ordm; ~ 173 & ordm; (this is a key step), and then wrap several layers of cloth on the main shaft, mainly to prevent scratches on the surface of the main shaft caused by the forceps. To align the degree, clamp the main shaft with forceful pliers so that the main shaft can not rotate, fix the position of the pliers, and then use the dial indicator to hit the bottom dead center of each machine head. Specific method: counter the plastic body at the lower part of the driving block with the measuring rod of the dial indicator, turn the eccentric cam in the positive and negative directions by hand, and when repeatedly seeing the pointer of the dial indicator pointing to the lower dead point of the slider, fasten the fastening sleeve screw of the eccentric cam, and adjust other machine heads according to the method. Then adjust the 100 & ordm; position of the encoder, so that the degree of tick time is between 196 & ordm; ~ 198 & ordm. If the quilting machine is used to embroider thick materials, the needle bar can be lowered to 200 & ordm; so that most of the machine heads will not jump when they are hooked.
2. Repair of thread trimming part
The thread cutting action angle of embroidery machine is between 285 & ordm; ~ 286 & ordm;. Some can set the thread cutting action angle and the proportion of thread cutting length. This paper introduces a simple method to adjust the thread trimming cam, which is the most commonly used method when the author repairs the thread trimming position. Specific adjustment method (Figure 1): stop the machine at 100 & ordm;, hold the thread trimming electromagnet with your hand upward, just when the thread trimming pendulum pin enters the position with the lowest curve camber of the thread trimming cam slot, which is the best position for the installation of the thread trimming cam. Fasten the thread trimming cam screw, and the length of the thread trimming head can be controlled by a little movement of the positive and negative rotation of the thread trimming cam position. Note that when the thread trimming swing rod pin enters the thread trimming cam slot, there must be a gap between the left and right of the pin in the slot to prevent the pin from being stuck in the slot during thread trimming. The principle of the thread cutting mechanism of the embroidery electromechanical magnet is the same as that of the computer flat sewing machine. If the thread cutting of some machine heads is found to be poor, check whether the moving knife position is too large and whether the moving and fixed knife edges are worn. It is worth noting that the position of thread trimming cam should not be changed in general, and can only be changed in case of poor thread trimming and overhaul of most machine heads.
3. The reason of embroidery machine running and its elimination
Pattern "running flowers"
Press the pattern selection key on the operation panel to display the pattern and check whether the pattern is wrong.
Reenter a pattern.
After shutdown, check whether the embroidery frame is loose, whether the two groups of drive belts in X and Y directions are consistent, whether they are too loose or too tight, whether the pulley is tight, and whether there is foreign matter entering.
If not, repair the mechanical part.
Record the starting point data and embroidery frame position of the pattern, and observe whether the pattern can return to the origin after "running". Press the "return to origin" or "start embroidery point" key after running, and the embroidery frame will return to observe whether the data of start embroidery point on the screen is consistent with the recorded data.
If the data is inconsistent, the main control board is faulty.
Overhaul the main control panel.
If the data is consistent, but the origin position of the embroidery frame is not correct, the step drive system is faulty.
Repair the stepper motor, driver and its transformer.
X or Y single direction running
Check whether the connecting wires of each part are faulty.
Remove the circuit fault and replace the faulty step driver.
Change the step driver in both directions, and observe which driver is faulty.
The drive power transformer or stepper motor is faulty.
Running in X or Y direction
The power grid voltage is unstable and the fluctuation range is too large.
Install a transformer with stable performance.
Memory disk pattern error.
After the system memory test, reset the data and input the pattern.
Step signal line is disturbed and causes running.
Find out the interference source, check whether the switch power supply (5V and 12V) and the rack have a DC voltage greater than 2V, and eliminate the leakage if any.

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