JPH0149816B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for adjusting the tension of knitting yarn during yarn feeding in order to uniformly adjust the loop length of one stitch, which is the minimum unit of stitches constituting the knitted fabric, when knitting a flat knitted fabric.

[Conventional technology]

When knitting fabric with a flat knitting machine, the fabric is knitted by the left and right reciprocating movement of the carriage. There may be cases where the lengths are different. The reason for this is that when the knitting yarn feeding source is located on one side of the knitting machine base, the yarn feeding device pulls out the knitting yarn as the carriage moves outward (this drawing speed is determined by the movement of the carriage). When knitting a knitted fabric (at least twice the speed) and when the carriage is turned over at the end of the knitting machine stand and knitting the already drawn-out knitting yarn, the speed is increased when the yarn is fed into the yarn feeding device. The tension of the threads is different. As a result, the loops of the stitches knitted when the carriage moves from side to side are different in size. Furthermore, the tension of the fed knitting yarn varies depending on the knitting speed of the knitting machine, and knitting irregularities may occur in the course of the knitted fabric. Therefore, as a means to make the knitted fabric uniform, a reference section is set on the needle bed, and the yarn length of the reference course fed to the needles in the reference section is used as the reference yarn length.
When knitting a subsequent course, the knitting yarn length used in the standard section of the course is compared with the standard yarn length, and the stitch drive unit is operated based on the comparison value to knit the knitting yarn used in the standard section of the subsequent course. A thread adjustment method was devised in which the thread length is compared with the reference thread length, and when the former is shorter than the latter, the thread is larger, and when the opposite is the case, the thread is smaller (patent application). (Sho 57-217251). However, when performing two-ply knitting or intarsia knitting, different yarn feeding members may be used in one course for the same thread. At times like this,
If the yarn tension is assumed to be constant, a difference in yarn tension causes a difference in the rotation of the encoder for yarn length measurement, resulting in inaccurate length measurements between each yarn.

[Problems to be solved by the invention]

In order to obtain uniformity of stitches between courses of the knitted fabric, the length of the knitting yarn fed to the needles in the reference section provided on the needle bed is taken as the reference yarn length, and the length of the knitting yarn fed to the needles in the reference section provided on the needle bed is used as the reference yarn length. If you compare the yarn length fed to the needle with the standard yarn length and adjust the yarn length by operating the knitting cam based on that value, the yarn length of the subsequent course will be adjusted so that it is equal to the standard yarn length. However, when measuring the length of the knitting yarn fed to the needles in the reference section, if there is a difference in the tension of each of the knitting yarns at the time of yarn feeding, the measurement of the knitting yarns may be difficult. It is difficult to measure the length accurately, so we were satisfied with approximate values. The present invention has been made in view of this point, and the knitted fabric is combined by numerically setting the basic loop length of the stitches in advance and making the total loop length of the stitches of the knitted course constant at a specified length. In order to make it possible to determine the length of the knitted fabric in advance when keeping the knitting degree constant, the tension of the knitting yarns fed with multiple types of yarns is adjusted appropriately, so that the length of the knitted fabric can be determined in advance. The purpose of this is to feed a predetermined length of yarn.

[Means to solve the problem]

One stitch that makes up the knitted fabric is the basic loop,
The length is numerically determined in advance and stored as a designated value length LA, and the actual measured length LB of the yarn required for subsequent course knitting and the stored designated value length LA
When the absolute value of (LA - LB)/LA becomes smaller than the minimum correction limit amount β, the tension of the yarn being knitted is not corrected and (LA -
When the absolute value of LB)/LA is larger than the minimum correction limit β, the tension of the thread being knitted is corrected, and when LA>LB, the direction in which the tension of the thread being knitted is smaller. ni, again, LA<
When using LB, adjust the tension in the direction that increases the tension of the threads being knitted.

[Effect]

Compare the reference value length stored in advance as a target value with the actual value length of knitted fabric knitting, and when the correction implementation limit ratio becomes a predetermined value or more, the tensor is set in the direction of increasing tension or decreasing the tension. move in that direction.

【Example】

From a plurality of knitting yarn package cages 2 provided on the machine stand of the flat knitting machine 1, each knitting yarn 3 is transferred to a tension device 4 dedicated to each knitting yarn and a yarn length detector 5 provided on both sides of the knitting machine stand. The yarn is then supplied to the needles (not shown) of the needle bed 8 by a yarn feeding member 7 that reciprocates with the carriage 6. On the front surface of the needle bed 8 of the flat knitting machine 1, a needle pitch display section 9 is provided which is made up of small projections whose number corresponds to the number of needles on the needle bed 8 (the number is not necessarily 1:1). Needle pitch sensor 10 for carriage 6
is opposite thereto, and detects which needle number the lock (not shown) of the carriage 6 corresponds to. The carriage 6 is provided with one or more locks including a pair of knitting cams, and the knitted fabric is knitted by operating the needles by known means. The tension device 4 has a structure as shown in FIGS. 3 to 6. Reference numeral 11 denotes a chassis roughly in the form of a box, and a shaft 13 is implanted by fixing a bolt-shaped base to the chassis with a nut 12. The shaft 13 has a threaded portion 14 formed on its head, and a gear 18 that meshes with a threaded portion 17 of a motor shaft 16 of a tension motor 15, which will be described later, is screwed into the threaded portion 14. A knitting yarn passage hole 19 is bored in the base of the shaft 13, and a knitting yarn guide groove 20 is provided in the knitting yarn passage hole 19 diagonally across the axis direction. Further, a stepped portion 21 is provided at the base of the shaft 13, and two plate-shaped bodies 22 and 23 are provided facing each other and loosely fitted onto the shaft 13 in a state in which the stepped portion 21 is in contact with the stepped portion 21. The contact surface of the dish-shaped body 22 and the plate-shaped body 23 when they come into contact with the stepped portion 21 is the knitting yarn passing hole 1.
It is desirable to position it on the center line of 9. A spring 24 is interposed between the plate-shaped body 23 and the gear 18, and urges the plate-shaped body 23 to press against the plate-shaped body 22. The pressing force is adjusted as appropriate by rotating the gear 18 with the threaded portion 14 and changing its position on the shaft 13 to change the elastic force of the spring 24. The tension motor 15 is supported by the chassis 11, and the rotation of the motor shaft 16 is transmitted to the gear 18 via the threaded portion 17, and movement on the shaft 13 due to the rotation of the gear 18 causes the plate-shaped body 23 to be transmitted via the spring 24. The applied pressure is changed. The pressing force (+/-) is controlled by the rotation angle of the tension motor 15. Drive control of the tension motor 15 is performed by a drive control section 50 that controls drive of each part of the knitting machine. The drive control section 50 is shown in block diagram form in FIG. The drive control unit 50 includes a main control calculation unit 51, a handle,
Storage section 52 for various information such as knitting machine control, fixed information input setting section 53, yarn length comparison calculation section 54, yarn length detection interface control section 55, knitting machine input/output interface control section 56, information input/output interface section 57, a tension motor interface control section 58, and the like. The main control calculation unit 51 is in charge of all control and calculation of this device, and is the center of the device, and always communicates information with various control units regardless of whether it is online or offline, and according to programs such as real-time processing and batch processing. and perform control to produce the desired results. When performing various types of knitting on the knitting machine, the storage unit 52 provides various knitting command input information (patterns, control, etc.) to the knitting machine and causes the knitting machine to perform knitting according to the instructions. , At the same time, it stores the calculation results and control results of the knitting machine from time to time, and reads out the memories from the main control section, etc.
Alternatively, it is possible to rewrite it. The fixed information input setting section 53 is a section for setting fixed designation data for the knitting machine, and inputs gauge input, backlash correction input, swing position correction input, yarn length calculation constant input, etc. Yarn length comparison calculation section 54
performs a comparison operation between the specified yarn length information from the main control section and the actually measured yarn length information from the yarn length detection interface control section 55, which will be described later, and sends the result to the main control section 51.
It is part of the main processing unit for sending data to The yarn length detection interface control section 55 is an interface section for sending a signal from a yarn length detection widening section 59 (described later) to the drive control section 50, and also determines whether the yarn length measurement signal is plus or minus. It is also possible to count and store these signals for each yarn used. The knitting machine input/output interface control unit 56 is a part that transmits and receives detection inputs such as needle pitch sensors, which are input information from the knitting machine, and output signals such as solenoids for operating the knitting machine, to and from the knitting machine. be. The information input/output interface unit 57 is compatible with input devices for inputting various input information and output devices for outputting information in the device, and is controlled by instructions from the main control unit. be done. The tension motor interface control unit 58 provides a circuit and an interface for performing forward/reverse control of the motor, etc., based on calculation results from the main control. The drive control section 50 includes a yarn length detection width increasing section 59;
An information input/output medium device 60 and a tension motor drive section 61 are provided, and are connected to a yarn length detection interface control section 55, an information input/output interface section 57, and a tension motor interface control section 58, respectively. Yarn length detection widening section 59
is the detector output signal for measuring the knitting yarn length,
This is a circuit section that performs widening and shaping, and it is possible to extract a signal output to distinguish between forward and reverse rotation. The information input/output medium device 60 is connected to input devices for inputting various input information, output devices for outputting information that requires information in the device, and also outputs corrections and corrections results and stored contents. It is also possible to output The tension motor drive section 61 controls the drive of the tension motor 15 of the tension device 4 provided on the machine stand of the flat knitting machine 1, and applies the required tension to the knitting yarn 3. This is the drive control section. In the drive control unit 50 described above, the degree of knitting of the fabric to be knitted is inputted to the storage unit 52 as data of the specified length LA by specifying the loop length or loop length of the loop for knitting the fabric. Here, the designated value length LA is given by the following equation. However, LA=(K1・N1・S+...+Kn・Nn・S) ×KS・KF・KT・KI・Kj S: Specified basic loop length Kn: Loop length for basic loop length S depending on the type of knitted fabric structure Ratio (basic loop S is based on plain knitting structure). Nn: Number of loops (=number of needles) used to measure the basic loop length during the course. KS: Theoretical length correction factor for formation speed. KF: Theoretical ground length correction factor for the formation direction. KT: Theoretical length correction factor for the winding down force. KI: Theoretical length correction factor for yarn spinning. Kj: Theoretical length correction factor for thread passage load. The above-mentioned Nn (the number of loops for measuring the basic loop length during the course) is determined and stored in advance at which needle position in the course to be measured. The loop length refers to the length l of the dashed-dotted line that is the center line of the knitting yarn 3 forming the loop in FIG.
The loop length refers to its height y. y and l are y=
There is a relationship of Kl, and in the case of a plain knitted structure, K=0.2079. The memory is stored in an information input/output media device 6 through information media such as floppy disks and magnetic tapes.
0 to information input/output interface control unit 57,
It passes through the main control unit calculation unit 51 and is stored in the storage unit 52. In addition to the loop length, the storage section 52 stores knitting command input information such as the pattern and structure of the knitted fabric to be knitted. The procedure for knitting the knitted fabric is as follows. The above-mentioned storage is monitored by appropriate means such as a CRT, and the data is checked and corrected by key operations, and the organization mode is set. The knitting mode is set by selecting whether or not to perform tension adjustment of the knitting yarn, and if so, by selecting the loop length or loop length. Then, the operation is started, but during the course to be knitted, for example, a course of discarded knitting, it is not necessary to adjust the tension of the knitting yarn. Therefore, it is determined from memory whether or not the course does not require such tension adjustment, and only for courses that require tension adjustment, the length of the knitting yarn actually used, that is, the actual measured length of the yarn used, is set as LB and the specified value. A comparison with long LA is made. When the carriage 6 moves, the needle pitch sensor 10 sequentially faces the needle pitch gauge section 9 provided in parallel with the needle bed 8, thereby inputting and outputting the needle pitch signal to the knitting machine. It is input to the main control calculation section 51 via the interface control section 56. On the other hand, the knitting yarn 3 pulled out from the package 2 by the yarn feeding member 7, which moves along with the movement of the carriage 6, is fed to the needles (not shown) of the needle bed 8. On the way, the knitting yarn 3 passes through a tension device 4 provided at the end of the knitting machine table and is wound around a yarn length detector 5 an appropriate number of times before being fed. To pass the knitting yarn through the yarn length detector 5, first manually move the dish-shaped body 23 to the sixth
The knitting yarn 3 is moved to the right in the figure against the elastic force of the spring 24 and positioned on the right side of the knitting yarn guide groove 20, and then the knitting yarn 3 is inserted into the knitting yarn guide groove 20, and the knitting yarn 3 is inserted into the knitting yarn passing hole 19. position within. Then, by applying the dish-like body 23 to the dish-like body 24 by the elastic force of the spring 24, the knitting yarn 3 is nipped between the dish-like bodies 22 and 23. Add tension. If the yarn is fed in this state, the yarn length detector 5 is rotated at the same time as the yarn is fed, and a pulse signal is generated along with the rotation. As described above, the pulse signal is emitted as a pulse signal for the yarn length fed to the needle in a predetermined specified range, that is, the actual measured yarn length LB, and is increased in yarn length detection width increasing section 59 and the yarn is It enters the yarn length comparison calculation section 54 via the length detection interface control section 55. Here, the specified value length LA already stored in the storage unit 52 is compared with the actual measured length LB of the thread used, and the absolute value of the error rate (LA - LB)/LA is calculated, and the error movement is determined from the abnormality processing limit ratio α. If it is large, take measures such as issuing a sound or light warning to stop the knitting machine. If the error rate is smaller than the abnormality processing limit ratio α, knitting continues as is; however, if the error rate is smaller than the correction execution limit ratio β, the tension is not adjusted at all, and the error rate is corrected. marginal ratio β
If it is larger than , adjust the knitting yarn tension. Here, the correction limit ratio β is a case where the error rate is less than the amount that can be corrected by the minimum unit correction, and an error of that degree falls within a range that cannot be corrected. As mentioned above, the error rate (LA-
When the absolute value of LB)/LA is larger than the correction limit ratio β, the tension of the knitting yarn is adjusted, but when the specified length LA is larger than the actual measured length LB, the tension of the knitting yarn is reduced. If the specified length LA is smaller than the actual measured length LB, adjustment is made in the direction in which the tension of the knitting yarn is increased. This adjustment is
The signal output from the main calculation section 51 is inputted to the tension motor drive section 61 via the tension motor interface control section 58, thereby causing the tension motor 15 to rotate positively or negatively as described above, thereby rotating the motor shaft 16. The knitting yarn tension is adjusted by moving the gear 18 meshing with the shaft 13 on the shaft 13 and changing the pressing force between the plate-shaped bodies 22 and 23. By adjusting the tension, the stitches of the knitted fabric are uniformly formed. In the adjustment of the knitting yarn tension described above, when the actual measured length of a predetermined number of loops is detected in the first course and it is known that the knitting yarn tension needs to be corrected, the correction is actually made by the carriage. The same thread used in the first course is used in the first course instead of being reversed and knitting the next second course.
This is done when the course is organized in the same direction as the previous course.
This is to align the conditions for organization.

【Effect of the invention】

According to the method of the present invention, when specifying the loop length or loop length of the knitted fabric, it is possible to specifically specify the length using the actual size, and the knitted fabric is equal to the specified dimension. A knitted fabric having stitches of uniform length can be made. For this reason, it is possible to calculate in advance the amount of yarn used for the entire knitted fabric, and in the case of patterned fabrics, it is possible to accurately predict the amount of yarn used for each color type, and it is possible to avoid using more yarn than necessary. It can also be prevented. In addition, since the specified value and the current measured value are compared during knitting, it is possible to obtain data for tension adjustment as described above, and to immediately detect any abnormality in the knitted fabric. I can do it. Furthermore, even when knitting the yarns of multiple yarn feeding members in one course using the same pile, such as when performing two-ply knitting or intarsia knitting, each yarn is fed with its own tension adjustment, so it is not looped. The length can be made uniform, and the dimensions of the knitted fabric can be made uniform.

[Brief explanation of drawings]

FIG. 1 is a block diagram including a drive control unit for carrying out the method of the present invention, FIG. 2 is a model diagram of a stitch loop, FIGS. 3 to 6 show a tension device, and FIG. 4 is a bottom view, FIG. 5 is a sectional view taken along the line of FIG. 3, FIG. 6 is a sectional view taken along the line of FIG. 3, and FIG. 7 is a front view of the knitting machine. l...Loop length, y...Loop length, LA...Specified value length, LB...Actual value length.

Claims (1)

[Claims] 1. The total length of one or more predetermined number of basic loops constituting the stitches of a predetermined course to be knitted is defined as a specified value length.
The specified value length LA is determined in advance as LA, and
Compare the actual length LB of the yarn used to knit a predetermined number of loops when knitting the fabric, and if LA > LB, move the yarn being knitted in the direction where the tension at the time of yarn feeding becomes smaller. A method for adjusting the tension of a knitting yarn during stockinette knitting, which is characterized in that when LA<LB, the magnitude of the tension is adjusted in the direction in which the tension at the time of feeding the yarn being knitted is increased. 2. The total length of one or more predetermined number of basic loops constituting the stitches of the predetermined course to be knitted is determined by the specified length.
The specified value length LA is determined in advance as LA, and
Compare the actual length LB of the yarn used to knit a predetermined number of loops when knitting the fabric, and calculate (LA-LB)/
When the absolute value of LA is smaller than the minimum correction limit β, the tension is not corrected and (LA−
When the absolute value of LB)/LA is larger than the minimum correction limit amount β, the tension is corrected, and when LA>LB, the tension is made smaller when the yarn is being knitted. A method for adjusting the tension of knitting yarn during stockinette knitting, characterized in that when LA<LB, the tension is adjusted in the direction in which the tension at the time of feeding the yarn being knitted is increased. 3. The adjustment method according to claim 1 or 2, wherein the length of the basic loop is the same as the length l of a line passing through the center of the yarn constituting one unit of stitch loop. 4. The length of the basic loop is the length of the loop length y multiplied by 4.809.
Adjustment method described in section. 5. A patent for adjusting the knitting yarn tension in a subsequent knitting course that is knitted in the same direction as the course in which the comparison was made, when the knitting yarn tension is adjusted by comparing the specified value length LA and the measured value length LB. The adjustment method according to claim 1 or 2. 6 When adjusting the knitting yarn tension by comparing the specified value length LA and the measured value length LB, adjust the knitting yarn tension in the subsequent knitting course in which the same knitting yarn is used as the course in which the comparison was made. An adjustment method according to claim 1 or 2, wherein the adjustment method is performed as described in claim 1 or 2. 7. The specified value length LA is the value obtained by multiplying at least the specified basic loop length by a coefficient and the number of loops that differ depending on the type of knitted fabric. Claim 1
or the adjustment method described in paragraph 2. 8 The specified length LA is calculated by multiplying the specified basic loop length by a coefficient and the number of loops that differ depending on the type of knitted fabric, and also by calculating the knitting speed, knitting direction, unwinding force, yarn type, and yarn path load. The adjustment method according to claim 1 or 2, wherein the adjustment method is a value obtained by multiplying any or all of the designated value length correction factors for the above.