Working principle and debugging of domestic computerized flat knitting machine

The working principle and debugging of the domestic computerized flat knitting machine automatically starts to reduce the waste of the yarn in the process of starting the knitting machine piece. The working principle of the computer flat knitting machine and the basic composition of the mechanism are introduced. Setting and debugging, combined with the weaving process, summarizes the items that need attention when weaving; the application of the automatic bottom plate technology no longer weaves the waste yarn, and can make the pieces separate weaving, and improve the starting speed of the empty machine and reduce the speed guard Labor intensity, to achieve economic operation and meet the needs of the market.
1 basic structure of the bottom plate mechanism
Although the sinker on the computerized flat knitting machine can function as a lowering coil, in the process from the start of knitting to the action of the pulling device on the cloth, the machine consumes a certain amount of yarn to make the tension of the cloth uniform and start. Normal weaving, which not only wastes time, but also wastes the yarn, and the woven pieces are joined together, which is inconvenient for stitching and post-processing [1]. In recent years, the domestic computerized flat knitting machine has developed rapidly, and the application of the bottoming technology has also been accepted by users of computerized flat knitting machines . The bottoming technique is to give the fabric a pulling force before the preparation of the knitting, so that the bottom of the piece can be quickly and save the yarn, and can be separately woven separately. The author introduces the structure, working principle, parameter setting, debugging and knitting matters of the bottom plate mechanism of the domestic computerized flat knitting machine .
2 The working principle of the bottom plate is that the bottom plate is a plate parallel to the mouth of the needle bed. The plate has a bottom pin similar to the groove needle. When the bottom plate rises, the machine first weaves a double rib (the coarse needle number is 1). +1 rib, this turn is woven with elastic yarn, the density is large, there is enough space to pull down when the bottom plate is lowered), the bottom stitch is inserted at the intersection of the double ribs, so that the ribbed cross yarn enters the bottom stitch In the hook; the bottom plate is lifted out of the needle tube by the action of the machine member, so that the needle opening closing hook yarn begins to descend, descends to the bottom of the needle bed mouth, and then the waste yarn weaving and the yarn feeder are brought into the knitting; when the above steps are completed After that, the fabric can be woven. The automatic starting plate mechanism is composed of a bottom plate, a transmission part, a roller opening and closing part, and an electric appliance control part.
2.1 There are two support plates at both ends of the bottom plate crochet plate. It is the bracket connecting the whole crochet plate and the sliding seat. The stepping motor is installed on the inner side of the bracket. The eccentric wheel of the motor drives the rack rail drive plate to reciprocate. The upper end of the bottom plate is a crochet, which is fixed on the crochet plate by a stopper iron, and a rack rail plate is installed below the crochet. The number of teeth on the inner side of the rack rail plate is matched with the number of crochet pins, and the needle shank of the crochet needle is embedded in the rack In the pool groove of the track plate, the rack is driven by the rack to move the rack pin to the needle pin, and the needle core is driven around the crochet riveting fulcrum to complete the opening and closing movement of the crochet. Principle of action: The motor runs counterclockwise. The cam in the front section of the motor pushes the transmission mechanism to the left, the rack plate moves to the right, and the hooker opens. On the contrary, the hook is closed when running clockwise. At the same time, the signal wheel behind the motor works synchronously. The signal wheel is equipped with a magnet, which can sense the opening and closing of two signal switches to detect the rotating position of the motor. If the signal position is improper or damaged, other components on the signal are damaged or the mechanical properties of the motor are damaged. If the card is stuck, the system will automatically report an error and cannot be zeroed.
2.2 The transmission part is respectively installed with a cylindrical slide rail on the inner wall panel of the rack. Each slide rail has a linear bearing sliding seat. The sliding seat is connected with the needle plate and connected to the timing belt. The timing belt is driven by the servo motor. Do the up and down movements. The linear bearing sliding seat rises, and the pull-down bar pushes the support plate to close the fabric guide plate. The bottom plate rises up to the head opening, the crochet pulls the fabric and then moves down. When the fabric has the length of the take-up grip, the roller closes and begins to wind up the fabric. When the crochet is disengaged, the linear bearing sliding seat descends rapidly. When it descends to the bottom, it hits the control board to overcome the spring pulling force. The pulling rod drags the fabric guide to open, and the fabric is guided along the guide to complete the automatic starting process.
2.3 Two ends of the roller opening and closing roller are equipped with two sliding shaft seats. When the roller is installed, it can open and close freely on the shaft seat. Two pairs of pull-ups are arranged on the side plate below the roller, and the active pull-up and the driven fork are connected by incomplete gear transmission. When working, the active fork is pushed, and the driven fork is relatively rotated by the action of the gear, and the pull is actively pulled. The top arc surface of the fork drives the roller to open and close. The control rod is riveted on the active fork, and the U-shaped fork of the control rod has an opening cam. The motor drives the opening cam, and the cam pushes the control rod to complete the opening and closing operation of the roller mechanism through the positive and negative rotation of the motor.
2.4 The signal device is equipped with a signal angle steel on the left wall panel, which is equipped with four Hall switches, which mainly control the upper and lower positions of the bottom plate; two Hall switches are installed under the left side of the roller to control the opening and closing of the roller. Limit.
3 parameter setting
3.1 Double pull-down number After the bottom plate reaches the third Hall signal from top to bottom, the take-up is closed and starts to pull down. At this time, the two pulling devices of the bottom plate and the take-up take together to pull the fabric, and cooperate with each other. The time can be adjusted by double pull-down number. If the set value is 3, after the winding is closed, the machine head is suspended after weaving the 3-turn pattern, and the bottom plate is unhooked and slid down to the bottom, and is taken separately by the take-up.
3.2 Starting take-up factor The starting take-up factor is used to adjust the tension of the bottom plate when pulling the fabric, which is controlled by the amount of pattern winding. In the case of a certain amount of coiling, the larger the coefficient, the greater the pulling force of the bottom plate; in the case of a certain coefficient, the larger the coiling amount, the greater the pulling force of the bottom plate; the specific pulling force depends on the actual situation. But pay attention to the combination of coefficient and volume.
3.3 Starting pull-down value The Hall signal that rises from the bottom to the top when the bottom plate starts. When the hooker hooks the bottom yarn, the pull-down: the amplitude of the pull-down can be adjusted by the pull-down value: the larger the value, the more The deeper, in the case of ensuring the continuous yarn, at least the highest point of the hook is pulled through the barrel wire to ensure that the needle does not touch the hook when knitting.
3.4 Winding and pressing step The winding step is used to adjust the degree of closing of the take-up from opening to closing. The larger the value, the tighter the winding is. The specific degree of compaction also depends on the position of the Hall signal when the winding is closed. If the set value is zero, the gap between the two ends of the machine before and after the zero adjustment of the machine is observed: if there is no gap, the parameter does not need to be adjusted too much; If there is a gap, gradually increase it as needed until there is no gap.
3.5 Start slowly and slowly start the parameter. The parameter is adjusted between “0” and “1”. The normal setting value is “0”. When the setting value is “1”, the bottom plate will automatically stop when it starts to start from the bottom to the second Hall signal from top to bottom. At this time, the operation interface will have a manual function prompt, which can pass “10”. The “ ” button is used to manually complete the hook pull-down action to observe the condition of the hook yarn, and the machine resumes operation after the pull-down. If the setting value is “0”, this series of actions will be completed automatically, without manual.
3.6 Unloading Waiting Time Each piece of fabric is knitted from the beginning to the end, and the machine will automatically unload the cloth; it can set the pause time from the unloading to the start of the next one. One number represents 1 S, depending on the situation. .
3.7 Take-up pull-down value When the bottom plate reaches the third Hall signal from top to bottom, the take-up will automatically close and pull down once. The pull-down volume is adjusted by the take-down pull-down value and depends on the fabric. Tension to determine.
4 weaving process
4.1 Weaving action After each piece of clothing is knitted and zeroed, the roller is opened, and the bottom plate is lowered to the lowest Hall position. At this time, the door (woven guide) is opened, and the scissors clips are all at the lowermost position; if there is no return to zero The motor will automatically report an error. After the knitting is started, the machine head is woven with a yarn feeder in the knitting area, and then the yarn feeder is brought to the over-limit Hall signal on both sides to stop, and the bottom plate is raised while the door is closed. When the bottom plate reaches the third Hall from top to bottom, if the setting value of the starting slow jog is 0, it will automatically increase slowly; if it is 1, the manual up and down keys need to be raised. When reaching the highest position, it should be noted that the bottom plate should not be too high, otherwise the needle plate will be damaged. At this time, the bottom plate is automatically stopped, the hook hook is closed, and the pull-down is automatically pulled down. At the same time, the pull-down value should be noted: the pull-down value is too large, and the yarn is easily broken; if the pull-down value is too small, the third Hall height is not reached, and the system will report an error. . Also pay attention to whether the hooker has a sinking nozzle, if there is no need to adjust the pull-down value and the third Hall height; if normal, the machine head automatically takes the yarn feeder to make a turn and then weave the fabric after single-sided weaving. Note: When starting the bottom plate, the starting density must be wide enough. If it is too small, it will break or not pull down, and an error will be reported. After normal weaving, it should be noted that the coiling amount and the starting coiling coefficient should be used together: when the coiling amount is too large, the starting yarn will be broken; or the bottom plate driving power supply protection will cause the bottom plate to not work. When the bottom plate reaches the second Hall position, the nose stops and the roller closes. At this point, you should pay attention to the tension of the fabric of the nozzle: if you feel suddenly loose, you need to adjust the take-up pull-down value; or consider increasing the number of take-up steps, and pay attention not too much, otherwise it may crush the transmission rod and other Parts. After the set double pull-down number is finished, the hook will automatically open, and the bottom plate will sink to the bottom to open the door (fabric guide). After the knitting is finished, the machine head will not be woven with a yarn feeder and turn four flat needles to the right. Stop, take up the continuous roll, open and unload, and weave.
4.2 Weaving Precautions
4.2.1 When starting the machine automatically, the high-elastic yarn is used for the bottom yarn, and the starting density is as loose as possible. Note the fit between the various parameters.
4.2.2 Before starting, it must be ensured that there is no fabric in the nozzle, the yarn feeder must be fully homing, and the needle detector should be flexible and effective.
4.2.3 If the number of rotations of the pattern is too small, the roller has not been reached before the end. It is recommended to use ribbing to start knitting.
4.2.4 After the end of each piece of clothing is finished, the machine will automatically unload the piece. You must pay attention to the unloading of the piece. If it is not completely removed, stop it immediately.
4.2.5 During the weaving process, some mechanisms will automatically stop when the machine is in motion. At this time, do not extend the head or other parts of the body to the running space of the machine head to prevent injury; it is best to observe the signal light as long as It is a green light and the machine is still working.