The 845 double-needle machine has a wide range of applications, mainly for sewing shirts, uniforms, overcoats, women's underwear, jackets, jeans, etc. This machine has a double-needle clutch-type needle bar structure, which makes the sewing machine accurate and convenient when sewing corners, acute angles and straight stitches. The machine bar and the feed dog feed synchronously, which can prevent the sewing material from slipping, and the stitches are beautiful and neat.
Synchronous adjustment method of 845 double needle machine needle
The movement of the feed dog and the needle
The standard synchronization relationship between the needle and the feed dog: when the feed dog just begins to expose the plane of the needle plate to start feeding, the needle should move downward and approach the plane of the needle plate at this time, and the needle should be aligned with the needle on the feed dog. Tolerance of needle holes (specific to needle feeding machines).
If the height of the needle and the direction of movement do not meet the above requirements, the timing wheel tape should be removed. Be careful to keep the feed dog at the beginning to expose the surface of the needle plate, then remove the timing wheel tape, then turn the handwheel to move the needle down and approach the surface of the needle plate, and then install the timing wheel tape. It can be seen that in the needle feeding machine, the movement coordination of the feeding dog and the needle is exactly the opposite of that of the non-needle feeding machine, that is, when the needle of the non-needle feeding machine is approaching the needle plate to pierce the material, the feeding dog must be lower than the needle plate surface, and the feeding action complete.
Needle feeding start position
Install the pendulum needle part to make it work. If the needle is not aligned with the needle hole on the feed dog when the feed dog is just beginning to rise to the surface of the needle plate, loosen the clamping screw of the pendulum shaft Dalian rod , Push the needle bar support by hand to make the machine needle align the needle hole on the feed dog body, then tighten the pendulum shaft Dalian rod clamping screw, slowly turn the handwheel, at this time the needle and the feed dog should keep synchronized movement . For the needle feeding machine with adjustable needle feeding range, if it is not synchronized, the needle feeding range needs to be adjusted. For example: the feeding dog moves 4mm, and the pendulum needle only moves 3.5mm, although the initial timing is aimed at the correct feeding dog. The needle hole on the upper side, when the feeding cycle is completed, the needle is no longer aligned with the feeding tooth body
The positioning of the timing belt of the double-needle lockstitch machine is actually the adjustment of the synchronization relationship between the needle and the feed dog. For needle feeding machines, before adjusting the synchronous movement relationship between the needle and the feed dog, first disengage the pendulum part, adjust the movement track of the feed dog and the height of the needle bar according to the requirements of the non-needle feeding sewing machine, and then adjust the needle and the feed dog. Feed dog
Finally, let everyone popularize it. The 845 type double needle machine lubrication device uses a small oil tank and uses oil lines for micro-oil lubrication, which effectively avoids the occurrence of machine oil leakage. However, after long-term use, poor lubrication due to various reasons will cause the machine to jam, especially in summer. Due to the high temperature, after the machine runs for a long time, the temperature of each moving part lacks effective lubrication, and the temperature rises too high, which is more likely to occur. Stuck.
