CN107904773B

CN107904773B - Knitting machine without triangle and knitting method thereof

Info

Publication number: CN107904773B
Application number: CN201711327270.3A
Authority: CN
Inventors: 朱立成; 陈悟; 董雄伟; 唐彬
Original assignee: Wuhan Textile University
Current assignee: Wuhan Textile University
Priority date: 2017-12-13
Filing date: 2017-12-13
Publication date: 2020-02-14
Anticipated expiration: 2037-12-13
Also published as: CN107904773A

Abstract

The invention discloses a triangle-free knitting machine, which comprises a needle plate base; the needle plate comprises a needle plate base, a needle plate, a plurality of trapezoidal grids, a servo motor, a needle pressing plate and a needle pressing plate, wherein the needle plate is arranged at the front end of the needle plate base, the trapezoidal grids are arranged at the rear end of the needle plate base, the servo motor is arranged in each trapezoidal grid, the servo motor drives a micro-elastic high-strength filament through a belt pulley, the micro-elastic high-strength filament is respectively connected with the front end and the rear end of a needle butt connecting piece, the needle butt connecting piece is sleeved on a needle butt of a knitting needle and locked, a knitting needle is arranged on the needle plate, the needle plate is further provided with a front pressing plate and a rear pressing plate, the front pressing plate is arranged on the front; the triangle-free knitting machine further comprises a central computer, a signal processor, a signal comparison module and other control systems. The invention also provides a knitting method of the cam-free knitting machine. The invention has simple structure, simple action, lower production cost, potential speed-increasing space and good application market.

Description

Knitting machine without triangle and knitting method thereof

Technical Field

The invention relates to a knitting machine, in particular to a cam-free knitting machine, and further relates to a knitting method of the cam-free knitting machine, belonging to the technical field of textile machinery and textile methods.

Background

In conventional weft knitting, one or more yarns are drawn from a bobbin yarn, laid on knitting needles of a weft knitting machine in a weft-wise sequence to form loops in sequence, and strung together in the longitudinal direction to form a fabric. In all weft knitting, the essential component is the cam system, and during the knitting process, the required knitting action is obtained by setting the movement of the knitting needles in different tracks of the cam, which causes inevitable collision and friction between the butts of the knitting needles and the cam and limits the running speed of the knitting machine.

When knitting a pattern on a weft knitting machine, it is necessary to select needles to form loops, tucks, or unwoven loops or to select sinkers to form loops in each knitting system according to the design of the pattern, and these are performed by a selection mechanism or a sinker selection device and other related parts.

Common needle selection mechanisms include a minute needle triangle, a multi-needle-track changing triangle, a jacquard wheel, a plectrum type and electronic needle selection.

During needle selection by the needle-separating cams, the cams with different thicknesses are respectively used for knitting needles with butts with different heights to select the needles. In practical knitting machines, the minute cams can also be realized with equal thickness, but with different radial thrust distances towards the centre of the needle cylinder. The needle selection method is not flexible enough because if the needle raising cam of a certain knitting system is designed to select the short-butt needle for knitting, all the middle-butt needles and the long-butt needles passing through the cam must be knitted, and cannot be tucked or unwoven.

The multi-track cam-changing needle selection adopts several knitting needles with butts of different heights, and is matched with several cam tracks of high and low grades, and every cam has three changes of loop-forming, tucking and non-weaving so as to implement needle selection. The selection method is realized depending on the design of a complex cam track and the multiple heel positions of the knitting needles, which also results in a complex mechanism and higher cost.

In the jacquard wheel needle selection mechanism, a needle selection jacquard wheel is similar to a helical gear, the jacquard wheel is arranged at the three corners of the needle raising, and the revolution surface is parallel to the working surface of the needle raising triangle. When selecting needle, the jacquard wheel is meshed with the needle butt, and the knitting needle is pushed to move along three tracks under the condition that steel rice is arranged in the groove of the jacquard wheel. The needle selection capability of this mode depends on the number of teeth of the jacquard wheel.

The plectrum type needle selection is realized by pushing a needle selection sheet through a plectrum type needle selection device, then pushing a needle jack by the needle selection sheet and then pushing a knitting needle to complete the needle selection action. The size of the pattern formed by the mechanism is related to the number of the shift plates, the number of the looping systems of the machine and the total number of needles.

The difference between the electronic needle selection and the above needle selection is that the electromagnetic control local mode is used to replace the mechanical selection, and the same point is that the cooperation between the middle part (such as the needle jack, the needle guide and the like) and the triangular track is required.

In summary, the basic principle of these needle selection methods is to use different methods to push the knitting needles required by the pattern to the corresponding cam working positions, and to match with the corresponding cam tracks, so as to complete the designed knitting action. The mechanisms are complex, the weaving pattern is limited, the cam system is still used, so that the inertia of cam motion is large (obvious on a flat knitting machine) during weaving, the noise is large, and the collision and friction between the cam and the needle butt are severe along with the increase of the speed, so that the material consumption is increased, and the cost is increased.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a knitting device without using a traditional knitting triangle, which mainly solves the following problems: the butt of the knitting needle is in rigid collision with the triangle; the friction between the needle butt of the knitting needle and the triangular inclined plane; the complexity and difficulty of changing the needle control of the traditional cam system (the needle can only move in a fixed track); the knitting needles outside the triangular knitting area are not controlled; the weaving speed cannot be further increased.

The invention is realized by the following steps:

a triangle-free knitting machine comprises a needle plate base, wherein the needle plate base is in a fold line shape and is arranged on a frame of the knitting machine, and the position of the needle plate base is restrained by a transverse guide rail and a needle plate transverse screw rod; the needle plate is installed at the front end of the needle plate base, a plurality of trapezoidal grids are arranged at the rear end of the needle plate base, a servo motor is installed in each trapezoidal grid, the servo motor drives a micro-elastic high-strength filament through a belt pulley, one end of the micro-elastic high-strength filament is connected with the front end of the needle heel connecting piece through an upper pulley and a front pulley, the other end of the micro-elastic high-strength filament is connected with the rear end of the needle heel connecting piece through a lower pulley, the needle heel connecting piece is sleeved on the needle heel of a knitting needle and locked, the knitting needle is installed on the needle plate, a front pressing plate and a rear pressing plate are further arranged on the needle plate, the front pressing plate is arranged on the front side of the needle heel position when the knitting needle is in a loop.

The knitting machine without the triangular needle also comprises a central computer, a signal processor, a signal comparison module, a servo driver and an inductor, wherein the central computer is used for inputting, editing, storing and analyzing knitting patterns and outputting signals to the signal processor; the signal processor processes the signal of the central computer and distributes the signal to the signal comparison module corresponding to each servo motor; the signal comparison module is responsible for comparing the signal input by the signal processor with the signal fed back by the sensor, checking the completion condition of the action of the servo motor and correcting the control signal according to the comparison result; the servo driver drives the servo motor according to the signal sent by the signal comparison module; the servo motor is an action executing part and moves according to the driving of the servo driver; the sensor is responsible for checking whether the action of the servo motor is in place or not and feeding back a signal to the signal comparison module.

The further scheme is as follows: in order to further improve the accuracy, the height difference of the adjacent servo motors is equal to the distance between the adjacent knitting needles.

The further scheme is as follows: each servo motor controls a knitting needle independently through a belt pulley and a micro-elastic high-strength filament.

The further scheme is as follows: the direction of the servo motor controls the ascending and descending of the knitting needle, the motion steps of the servo motor control the stroke of the knitting needle, the input pulse frequency of the servo motor controls the speed of the knitting needle, and the input pulse time sequence of each servo motor controls the sequence of the actions of each knitting needle.

The cam-free knitting machine provided by the invention cancels the traditional knitting cam system, and uses a servo motor to independently control each knitting needle. In the working process, the knitting needle can be directly driven to ascend or descend by changing the rotating direction of the servo motor; the displacement of the knitting needle is controlled by setting the number of rotation steps of the servo motor, that is, to reach each of the knitting (loop forming, tucking, and transferring) and non-knitting positions. During transferring (turning over needles or hanging meshes, etc.), the action of the knitting needle equipped with the ring expanding sheet is matched with the transverse movement of the needle bed.

It should be noted that, the central computer, the signal processor, the signal comparison module, the servo driver, the sensor, etc. used in this application are all conventional related instruments and devices for those skilled in the art. The core of the invention is to creatively integrate these devices for the first time with the deltoid knitting machine of the invention, so as to obtain a completely new knitting device.

Another object of the present invention is to provide a knitting method of a cam-less knitting machine.

This object of the invention is achieved by:

the knitting method of a non-triangular knitting machine mainly adopts the non-triangular knitting machine provided by the invention, and specifically comprises the following steps:

setting the positions of the knitting needles according to the specific conditions of the loom and the knitting needles; inputting the tissue structure parameters of the garment pieces into a central computer; the central computer analyzes and distributes knitting actions of all the courses in sequence; the knitting actions of each row are processed by the signal processor and then sent to the signal comparison module, the signal comparison module sends the signals to the servo driver, the servo driver outputs the signals to the servo motors in a pulse form, the servo motors receive the signals and then finish the distribution actions in sequence with a certain time difference, and the corresponding knitting needles are controlled to finish the corresponding knitting actions, so that the knitting is finished.

The further scheme is as follows:

setting the positions of the knitting needles comprises setting the specific positions of the knitting needles during loop forming, tucking, transferring and non-knitting.

The further scheme is as follows:

in the working process of the servo motor, the sensor detects whether each action of the servo motor is in place or not and feeds back a signal to the signal comparison module, and the signal comparison module corrects a control signal in time according to the feedback signal to ensure that the action of the servo motor is in place.

The invention cancels the traditional cam system, uses the servo motor to control each knitting needle independently, has simple structure and simple action (cancels the work waiting position of the knitting needle in the traditional cam system), and has lower production cost, potential speed-increasing space and good application market because the original knitting method and main knitting components (needle plate and knitting needle) are not required to be changed.

Drawings

Further details of the invention can be taken from the detailed description shown in the drawings, in which:

fig. 1 is a control schematic diagram of the cam-less knitting machine of the present invention.

FIG. 2 is a schematic view of a part of the mechanism of the cam-less knitting machine of the present invention.

FIG. 3 is a side view of a portion of the mechanism of the present invention without the cam knitting machine.

In the figure: 1. the needle plate comprises a needle plate base, 2 parts of a servo motor, 3 parts of a belt pulley, 4 parts of micro-elastic high-strength filaments, 5 parts of an upper pulley, 6 parts of a front pulley, 7 parts of a butt connecting piece, 8 parts of a lower pulley, 9 parts of a needle plate transverse screw rod, 10 parts of a knitting needle, 11 parts of a needle plate, 12 parts of a front pressing plate and 13 parts of a rear pressing plate.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

Example 1

The cam-free knitting machine provided by the embodiment mainly comprises a mechanical part and a control part.

The mechanical part is mainly as shown in attached figures 2 and 3, and the needle plate base 1 is in a zigzag shape and is arranged on a frame of the loom, and the position of the needle plate base 1 is restricted by a transverse guide rail and a needle plate transverse screw 9; the needle plate 11 is arranged at the front end of the needle plate base 1 according to the traditional configuration mode, and the rear end of the needle plate base 1 is sequentially in fan-shaped configuration due to the fact that the number of the knitting needles 10 is large in the width range. The rear end of a needle plate base 1 is provided with a plurality of trapezoidal grids, a servo motor 2 is installed in each trapezoidal grid, the servo motor 2 transmits a micro-elastic high-strength filament 4 through a belt pulley 3, one end of the micro-elastic high-strength filament 4 is connected with the front end of a needle heel connecting piece 7 through an upper pulley 5 and a front pulley 6, the other end of the micro-elastic high-strength filament is connected with the rear end of the needle heel connecting piece 7 through a lower pulley 8, the needle heel connecting piece 7 is sleeved on a needle heel of a knitting needle 10 and locked, the knitting needle 10 is installed on a needle plate 11 in a traditional mode, a front pressing plate 12 and a rear pressing plate 13 are further arranged on the needle plate, the front pressing plate 12 is arranged on the front side of the needle heel position when the knitting needle 10 is in a loop transfer position, and the rear pressing plate;

to further improve the accuracy, the height difference between adjacent servomotors 2 is equal to the distance between adjacent needles 10.

Each servo motor 2 controls a knitting needle 10 independently through a belt pulley 3 and a micro-elastic high-strength filament 4.

The direction of rotation of the servo motor 2 controls the ascending and descending of the knitting needle 10, the motion steps of the servo motor 2 controls the stroke of the knitting needle 10, and the input pulse frequency of the servo motor 2 controls the speed of the knitting needle 10.

The control operation principle of the control part is shown in figure 1,

the non-triangular knitting machine also comprises a central computer, a signal processor, a signal comparison module, a servo driver, a semi-closed loop system consisting of a servo motor and an inductor, wherein each servo motor is controlled by the semi-closed loop system, and each servo motor independently controls each knitting needle arranged on the needle plate through a belt pulley and a micro-elastic high-strength filament to complete knitting actions such as looping, tucking, transferring, non-knitting and the like. The central computer is responsible for inputting, editing, storing, analyzing, outputting and the like of the weaving pattern; the signal processor is responsible for processing and distributing the signal of the central computer; the signal comparison module is responsible for comparing the input signal of the signal processor with the input signal of the sensor, checking the completion condition of mechanical action and compensating in the semi-closed loop when needed; the servo driver is responsible for driving the servo motor according to the received signal; the servo motor is an action executing part and moves according to the signal of the servo driver; the sensor is responsible for checking whether the action of the servo motor is in place or not and feeding back a signal to the signal comparison module.

During knitting, the motion steps and the motion direction of each servo motor are set by changing the output pulses in real time, so that the stroke and the motion direction of the corresponding knitting needle can be determined, and various knitting actions of the knitting needle can be finished. The loom has simple structure, avoids the collision and friction between the cam and the needle butt, and is favorable for the diversity of knitting patterns by the independent control of each knitting needle.

Example 2

The embodiment provides a knitting method of a cam-free knitting machine, which specifically comprises the following steps:

setting various positions of the knitting needles according to specific conditions of the loom and the knitting needles, including setting specific positions of the knitting needles during looping, tucking, transferring and non-knitting; inputting the tissue structure parameters of the garment pieces into a central computer; the central computer analyzes and distributes knitting actions of all the courses in sequence; the knitting actions of each row are processed by the signal processor and then sent to the signal comparison module, the signal comparison module sends the signals to the servo driver, the servo driver outputs the signals to the servo motors in a pulse form, the servo motors receive the signals and then finish the distribution actions in sequence with a certain time difference, and the corresponding knitting needles are controlled to finish the corresponding knitting actions, so that the knitting is finished.

In operation, the servo motor 2 controls the knitting needles 10 to be raised in a conventional manner, that is, the knitting needles 10 on the front and rear needle plates 11 are arranged at intervals.

When the needle is turned over, the knitting needle 10 with the widening stitch piece is lifted to a transfer position under the action of the servo motor 2, and meanwhile, the needle plates 11 transversely move for half a needle pitch, so that the knitting needles 10 on the two needle plates 11 are oppositely arranged; a knitting needle needing to be connected rises to a looping position, and a needle head of the knitting needle passes through the widening ring piece and then keeps the position; the knitting needle with the widening ring piece descends to a non-knitting position, and a coil on the knitting needle drops into a knitting needle hook of the connecting needle; the knitting needle of the receiving needle returns to the non-knitting position, the needle bed resets, and the needle turning action is completed.

When narrowing (taking single-side fabric narrowing as an example), firstly determining the number of the needles needing transferring according to the requirements of bright and dark narrowing, then transferring a transferring signal to a servo motor corresponding to the knitting needle needing transferring, transferring the loops needing transferring to the knitting needle of the opposite needle plate according to the needle transferring method, and finally transferring the loops to the target knitting needle by needle transferring again.

The normal knitting and needle releasing actions are the same as those of the traditional method, and the corresponding needle displacement can be quickly obtained only by sending a correct pulse signal to a servo motor of the corresponding needle when needle selection is needed, such as tucking and the like, so that the required actions are completed.

The essence of the embodiment of the invention is that the specific action of the knitting needle is completed through automatic control by the control part. The movement of the specific needles is similar to the conventional method and is not described in detail.

Although the present invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be preferred embodiments of the present invention, it is to be understood that the invention is not limited thereto, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.

Claims

1. A triangle-free knitting machine comprises a needle plate base and is characterized in that: the needle plate base is in a fold line shape and is arranged on a frame of the loom, and the position of the needle plate base is restricted by the transverse guide rail and the needle plate transverse screw; the needle plate is arranged at the front end of the needle plate base, a plurality of trapezoidal grids are arranged at the rear end of the needle plate base, a servo motor is arranged in each trapezoidal grid, the servo motor drives a micro-elastic high-strength filament through a belt pulley, one end of the micro-elastic high-strength filament is connected with the front end of a needle butt connecting piece through an upper pulley and a front pulley, the other end of the micro-elastic high-strength filament is connected with the rear end of the needle butt connecting piece through a lower pulley, the needle butt connecting piece is sleeved on and locked with a needle butt of a knitting needle, a knitting needle is arranged on the needle plate, a front pressing plate and a rear pressing plate are further arranged on the needle plate, the front pressing plate is arranged on the front side of the needle butt position when the knitting needle is in a;

the knitting machine without the triangular needle also comprises a central computer, a signal processor, a signal comparison module, a servo driver and an inductor, wherein the central computer is used for inputting, editing, storing and analyzing knitting patterns and outputting signals to the signal processor; the signal processor processes the signal of the central computer and distributes the signal to the signal comparison module corresponding to each servo motor; the signal comparison module is responsible for comparing the signal input by the signal processor with the signal fed back by the sensor, checking the completion condition of the action of the servo motor and correcting the control signal according to the comparison result; the servo driver drives the servo motor according to the signal sent by the signal comparison module; the servo motor is an action executing part and moves according to the driving of the servo driver; the sensor is responsible for checking whether the action of the servo motor is in place or not and feeding back a signal to the signal comparison module;

the height difference of the adjacent servo motors is equal to the distance between the adjacent knitting needles.

2. The cam-less knitting machine of claim 1 wherein: each servo motor controls a knitting needle independently through a belt pulley and a micro-elastic high-strength filament.

3. The cam-less knitting machine of claim 1 wherein: the direction of the servo motor controls the ascending and descending of the knitting needle, the motion steps of the servo motor control the stroke of the knitting needle, the input pulse frequency of the servo motor controls the speed of the knitting needle, and the input pulse time sequence of each servo motor controls the sequence of the actions of each knitting needle.

4. A knitting method of a cam-free knitting machine is characterized in that: the cam-free knitting machine of any of claims 1 to 3 is used and comprises the following steps:

setting the positions of the knitting needles according to the specific conditions of the loom and the knitting needles; inputting the tissue structure parameters of the garment pieces into a central computer; the central computer analyzes and distributes knitting actions of all the courses in sequence; the knitting action of each row is processed by the signal processor and then sent to the signal comparison module, the signal comparison module sends the signal to the servo driver, the servo driver outputs the signal to the servo motors in a pulse form, and each servo motor receives the signal and then controls each corresponding knitting needle in sequence according to a certain time difference to finish the corresponding knitting action, so that the knitting is finished.

5. The knitting method of the cam-less knitting machine according to claim 4, characterized in that:

6. The knitting method of the cam-less knitting machine according to claim 4, characterized in that: