JPH08158213A - Method for knitting flat knit fabric and apparatus therefor - Google Patents

Abstract

PURPOSE: To prevent a new loop from slipping off the corresponding knitting needle. CONSTITUTION: A knitting needle is made to stand by at a position between the reference position for the knitted fabric density and the rear end position for the knitted fabric density in a method for knitting flat knit fabric by advancing and retreating each of plural knitting needles with actuators and an apparatus therefor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for knitting a flat knitted fabric by reciprocating each knitting needle by an actuator such as a linear motor.

[0002]

2. Description of the Related Art In a flat knitting machine, each knitting needle is advanced from a standby position to a most advanced position for forming a loop, and then a trailing end position for forming a stitch through a reference position for forming a stitch. Then, the knitting needle is made to stand by in the free state where the force of the loop is received until the next course, particularly the formation of the next loop, after advancing from the retracted position to the reference position. In the present invention, the movement of the knitting needle from the standby position to lock the knitting yarn is called forward movement, and the opposite movement is called backward movement.

A new loop formed by the latest knitting needle (a loop formed by the movement of the latest knitting needle,
The loop that is actually locked to the knitting needle) receives a moment that causes it to disengage from the corresponding knitting needle by the old loop through which the new loop passes (the loop formed by the previous movement of the knitting needle). ing.

However, in the conventional knitting machine, since the standby position of the knitting needle is the reference position, the knitting needle in the atmosphere is merely passed through the new loop, and the new loop is not locked in many cases. As a result, the new loop through which the waiting knitting needle is threaded often comes off the corresponding knitting needle due to the moment caused by the old loop.

The fact that the new loop is disengaged from the corresponding knitting needle means that when the pulling down force acting on the knitted fabric is small, when knitting a three-dimensional pattern portion, the number of knitting courses on both needle beds is different, as in jacquard knitting. When, when transferring
It often occurs when aligning and pile knitting. When the new loop comes off from the corresponding knitting needle in this way, the portion of the new loop becomes a drop and appears in the flat knitted fabric, and the commercial value of the knitted fabric decreases.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to prevent a new loop from coming off the corresponding knitting needle.

[0007]

The knitting method and device of the present invention are applied to a method and device for knitting a weft knitted fabric by advancing and retracting each of a plurality of knitting needles by an actuator.

In the knitting method of the present invention, the knitting needle is advanced by a predetermined amount, then the knitting needle is retracted through the reference position for the stitch to the rear end position for the stitch, and then the knitting needle is further advanced by the predetermined amount from the retracted position. And then waiting the knitting needle at the standby position, the standby position being a position between the reference position and the rear end position.

The knitting apparatus of the present invention comprises a knitting data setting device for setting knitting data, an arithmetic control circuit for outputting a driving signal for operating an actuator based on the knitting data set by the setting device, and a driving signal. A driver for operating the actuator, the drive signal is a signal portion for advancing the knitting needle by a predetermined amount, then a signal portion for moving the knitting needle through a reference position for the stitch and back to the rear end position for the stitch, and then the knitting needle Is further advanced from the retracted position by a predetermined amount, and a signal unit for causing the knitting needle to stand by at a standby position between the reference position and the rear end position.

The stitch size is determined by the distance between the reference position and the retracted position, in other words, the amount of movement of the knitting needle from the reference position to the retracted position. The new loop is passed through the old loop by retracting to the rear end position after passing through the reference position while the knitting yarn is held by the knitting needle.

According to the present invention, since the knitting needle stands by at a position between the reference position and the rear end position, the waiting knitting needle is
The new loop is kept slightly pulled backwards compared to the conventional one, and the new loop is securely locked. This prevents the new loop from coming off the waiting knitting needle.

The knitting needle may be advanced directly from the retracted position to the standby position. Instead of this, the knitting needle is advanced from the retracted position to the reference position via the standby position or beyond the reference position, and then the knitting needle advanced to the reference position or beyond the reference position is retracted to the standby position, The knitting needle may be parked at that position. In either case, it is possible to prevent the new loop from coming off from the knitting needle on standby.

The former is achieved in that the signal portion for advancing the knitting needle from the retracted position by a predetermined amount includes a signal portion for directly advancing the knitting needle from the retracted position to the standby position. On the other hand, in the latter, the signal part for advancing the knitting needle from the retracted position by a predetermined amount includes a signal part for advancing the knitting needle to the reference position or beyond the reference position, and the signal part for waiting the knitting needle at the standby position is the reference. A signal portion for retracting the knitting needle advanced to the position or beyond the reference position to the standby position,
And a signal portion that causes the knitting needle to stand by at that position.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 and 2, a knitting device 10
Includes a pair of needle beds 12, 12 '. Needle bed 12, 12 '
2 are arranged in a mountain shape at intervals in the front-back direction (left-right direction in FIG. 2) in plan view so as to form a needle bed gap portion 14 extending in the left-right direction in FIG. It extends in the width direction of the ground 16 (direction perpendicular to the paper surface in FIG. 2). The needle beds 12 and 12 ′ are supported by a frame (not shown) so as to be relatively movable in the width direction of the knitted fabric 16.

As shown in FIG. 2, a large number of knitting needles 18 such as a latch needle and a crochet needle are provided on the needle beds 12 and 12 ', respectively.
Are arranged so that they can move back and forth in the front-back direction. In FIG. 2, the knitting needles on the front side (front side) are shown waiting at the standby position, and the knitting needles on the back front side (back side) are advanced from the standby position. It is shown in a state in which the knitting needles on the front needle bed are held in the standby position.

The knitting device 10 also includes a drive roller 20 and a driven roller 22 disposed below the bed gap 14 so as to pull down the knitted fabric. Both rollers 20 and 22 extend in the width direction of the knitted fabric 16 so as to sandwich the knitted fabric 16 in cooperation with each other, and form a pulling down mechanism that pulls down the knitted fabric 16 at a predetermined speed. The driven roller 22 receives a predetermined pressing force toward the drive roller 20.

The needle bed 12 'is a needle bed drive mechanism 2 shown in FIG.
4, it is relatively displaced in a direction perpendicular to the paper surface of FIG. 2 (longitudinal direction of the tooth gap part 14). Each knitting needle 18 is reciprocally moved in a predetermined needle movement pattern in the longitudinal direction of the knitting needle by the actuator 26 shown in FIG. Drive roller 20
Is rotated by the drive mechanism 28 for pulling down shown in FIG. As the actuator 26, Japanese Patent Publication No.
A needle motor such as the linear motor described in the publication can be used.

The needle movement pattern is a cam type flat knitting machine in which a knitting needle is reciprocally moved by a cam, similar to what is called a cam pattern, a cam diagram, etc. The amount of movement of the yarn feeder, the combination thereof, and the like can be represented as a diagram with the horizontal axis. An example of the needle movement pattern is shown in FIG. In FIG. 3, the vertical axis represents the movement amount (position) of the knitting needle, and the horizontal axis represents time, the movement amount of the yarn feeder, or a combination thereof.

As shown in FIG. 1, the needle bed drive mechanism 24 is driven by a needle bed driver 30, each actuator 26 is driven by an actuator driver 32, and the pull-down drive mechanism 28 is driven by a pull-down driver 34. It Driver 30, 32, 34 is CP
It is controlled by the arithmetic processing circuit 36 using U.

A knitting data setting device 38 is connected to the arithmetic processing circuit 36. The knitting data set in the setting device 38 is various data necessary for knitting such as knitting structure, knitting speed, needle movement pattern, and so-called knitting stitches for displacing stitches such as a transfer portion and a stitching portion. Including displacement part. These knitting data are set by a magnetic tape, a magnetic card, a host computer or the like before knitting.
However, the knitting data may be set in the setter 38 by a host computer or the like in parallel with the knitting process.

During knitting, the arithmetic processing circuit 36, based on the knitting data set by the knitting data setting device 38, the displacement speed of the needle bed 12 and the reciprocating movement speed of each knitting needle 18 in each process of knitting motion, Calculate the pull-down speed of the knitted fabric 16, the tension applied to the knitted fabric 16, the moving speed of the yarn feeder, etc.,
The calculated value is used to generate a drive signal to be supplied to the drivers 30, 32, 34, the drive circuit of the yarn feeder moving base, and the like.

The drive signal supplied to the needle bed driver 30 causes the needle bed 12 to undergo a displacement determined by the knitting structure in the knitting data when the stitches should be displaced, such as stitch transfer and stitching. It is a stitch displacement command such as a transfer command and a stitching command. When the stitch displacement command is supplied, each needle bed driver 30 moves the needle bed 12 ′ with respect to the needle bed 12 by a distance corresponding to the stitch displacement command.

The drive signal supplied to the actuator driver 32 is a needle drive signal for moving the knitting needle 18 back and forth, that is, a needle movement signal, according to the needle movement pattern determined by the knitting speed and knitting structure in the knitting data. .
The actuator driver 32 includes an arithmetic processing circuit 36.
The actuator 26 is operated so as to reciprocate the knitting needle 18 at a speed according to the needle movement signal supplied from

The drive signal supplied to the pull-down driver 34 is a speed signal corresponding to the rotation speed in each process of the knitting motion. The rotation speed is a value that produces a pull-down speed determined by the pull-down speed of the knitted fabric, the tension applied to the knitted fabric, the pressing force of the driven roller 22 against the drive roller 20, and the like. The pull-down driver 34 includes an arithmetic processing circuit 36.
The pull-down drive mechanism 24 is operated so as to pull down the knitted fabric 16 at a speed and a tension according to the speed signal supplied from.

When the knitting needle is moved in the needle movement pattern shown in FIG. 3, the needle movement signal supplied to the actuator driver 32 is a signal portion for advancing the knitting needle from the standby position 100 to the most advanced position 102 via the reference position 101. A signal portion for retracting the knitting needle to the rear end position 103 via the reference position 101, a signal portion for further advancing the knitting needle from the retracted position 103 by a predetermined amount, and a signal portion for making the knitting needle stand by at the standby position 100.

In FIG. 3, the standby position 100 is a position between the reference position 101 and the rear end position 103. The distance L between the reference position 101 and the rear end position 103 is related to the size of the stitch, and the larger the distance L, the larger the stitch. The most advanced position 102 is a protruding position of the knitting needle that is necessary for locking the knitting yarn, which is moved in the arrangement direction of the knitting needle by the yarn feeder, at the most distal hook portion of the knitting needle.

Since the standby position 100 is a position between the reference position 101 and the rear end position 103, of the drive signals supplied to the actuator driver 32, a signal for further advancing the knitting needle from the retracted position 103 by a predetermined amount. The part is a signal part for advancing the knitting needle from the rear end position 103 to the standby position 100, and the signal part for making the knitting needle stand by at the standby position 100 is a signal part for making the knitting needle advanced to the standby position 100 stand by at that position.

When the needle movement signal for the knitting needle is supplied to the actuator driver 32 while the knitting needle is waiting at the waiting position 100 in FIG. 3, the actuator driver 32 responds to the needle movement signal. The knitting needle to be advanced from the standby position 100 to the most advanced position 102 via the reference position 101, then from the most advanced position to the retracted position 103 via the reference position 101, and further from the retracted position 103 to the standby position 100. Then, the corresponding actuator 26 is controlled so as to wait at the waiting position 100 for the formation of the next loop.

As shown in FIG. 4A, the waiting knitting needles 18a and 18b are respectively passed through the old loops 42a and 42b formed by the previous reciprocating movement of the knitting needles, and the new loop 40a. And 40b are hooked to the most advanced hook. Knitting needles 18a and 18b
The new loops 40a and 40b, which are locked to, are passed through the old loops 42a and 42b, respectively.

FIG. 4 shows an embodiment of three-color jacquard knitting in which the knitting needles 18a on the left side form the loops 40a and 42a for the front stitches and the knitting needles 18b on the right side form the loops 40b and 42b for the back stitches. In FIG. 4, (A) shows a state in which the knitting needles 18a and 18b are both in the standby position,
(B) and (C) show a state in which the knitting needle 18a forming the front stitch is in the standby position and the knitting needle 18b forming the back stitch advances from the standby position, and (D) shows the front stitch and the back stitch on the left and right sides, respectively. Shown in.

When the knitting needle in standby is moved by the actuator 26 in accordance with the needle movement pattern shown in FIG. 3, the knitting needle first advances through the standby position 100 to the most advanced position 102, thereby at least moving the knitting needle to the previous loop. And then in that state the most advanced position 102
From the reference position 101 to the retracted position 103, thereby pulling the hook part and the knitting yarn through the loop until then, Knit the part of the knitting yarn that holds the previous loop on the hook, that is, the new loop, on the previous loop.

The above control is performed by the actuator 26.
This can be performed by using the so-called position control method of controlling the position of the mover or the knitting needle by sensing the position of the mover with respect to the stator, the position of the knitting needle with respect to the needle bed 12, and the like.

The standby position 100 of the knitting needle is the reference position 101.
4A and the rear end position 103, the waiting knitting needles 18a and 18b shown in FIG. 4A maintain the new loops 40a and 40b slightly pulled back, respectively. In addition, the knitting needle 18a in standby shown in FIG.
Is the new loop 4 even if the other knitting needle 18b is advanced.
Keep 0a pulled back slightly. For this reason,
The knitting needle securely locks the new loop during its waiting and until the formation of the next loop, and prevents the new loop from coming off the waiting knitting needle.

On the other hand, when the standby position 100 of the knitting needle is the reference position 101, the knitting needle advances from the retracted position 103 over the position 100 to the reference position 101 as shown by the dotted line 104 in FIG. Wait at 101. Therefore, as shown in FIG. 4 (C), the hook portion of the knitting needle 18a and the tip of the new loop 40a are far apart from each other as compared with the case shown in FIG. 4 (B). The knitting needle 18a is disengaged from the knitting needle 18a during the waiting time until the next loop is formed without being locked by the hook portion, and as a result, a stitch drop is formed on the knitted fabric.

The knitting needle is moved from the retracted position 103 to the standby position 10
Instead of advancing directly to 0, move the knitting needle to the retracted position 103
It is also possible to advance the knitting needle advanced to the reference position 101 or beyond the reference position 101 through the standby position 100, and then to retract the knitting needle advanced to the reference position 101 or beyond the reference position 101 to the standby position 100. In this case, of the needle movement signals supplied to the actuator driver 32,
The signal portion for advancing the knitting needle further from the retracted position 103 by a predetermined amount is a signal portion for advancing the knitting needle from the retracted position 103 through the standby position 100 to the reference position 101 or beyond the reference position 101, and the knitting needle to the standby position 100. Signal part to stand by and reference position 101 or reference position 1
01 for retracting the knitting needle advanced beyond 01 to the standby position 100.

As described above, setting the standby position 100 of the knitting needle between the reference position 101 and the rear end position 103
In particular, when the pulling down force applied to the knitted fabric is small, when knitting a three-dimensional pattern part, when the number of knitting courses on both needle beds is different, such as jacquard knitting, and when transferring stitches, the stitches are aligned. In this case, it is suitable for pile knitting. Therefore, when performing such a flat knitting or when knitting a portion of such flat knitting, the knitting needle is made to stand by at the standby position 100, and in the case of other knitting patterns such as general plain knitting or other knitting patterns. When knitting the portion, the knitting needle may stand by at the reference position 101. However, in the case of other knitting patterns such as general flat knitting, and also when knitting other knitting pattern portions, the knitting needle may be made to wait at the waiting position 100.

The present invention is not limited to the above embodiment. For example, the present invention can be applied not only to a knitting device having two needle beds, but also to a knitting device having one needle bed. Further, according to the present invention, it is possible to prevent the new loop from coming off the knitting needle until the next loop is formed. Therefore, even if the pull-down force acting on the knitted fabric, the tension acting on the knitted fabric, etc. are reduced. Alternatively, a presser foot for pressing the knitted fabric, a movable sinker, etc. may be omitted.

[Brief description of drawings]

FIG. 1 is a block diagram of an electric circuit showing an embodiment of a knitting apparatus of the present invention.

FIG. 2 is an enlarged sectional view showing an example of a knitting mechanism portion.

FIG. 3 is a diagram for explaining a state in which the new loop is reliably locked to the knitting needle and a state in which the new loop is disengaged from the knitting needle.

FIG. 4 is a diagram showing an example of a needle movement pattern.

[Explanation of symbols]

 10 Knitting device for flat knitted fabric 12, 12 'Needle bed 14 Tooth opening 16 Knitted fabric 18, 18a, 18b Knitting needle 40a, 40b New loop 42a, 42b Old loop

Claims (6)

[Claims] 1. A method of knitting a flat knitted fabric by advancing and retracting each of a plurality of knitting needles by an actuator, wherein the knitting needles are advanced by a predetermined amount,
Next, including retracting to a rear end position for stitches via a reference position for stitches, then further advancing a predetermined amount from the retracted position, and then waiting the knitting needle at a standby position, the standby position comprising: A knitting method for a flat knitted fabric, which is located between a reference position and the rear end position. 2. The knitting method according to claim 1, wherein when the knitting needle is advanced from the retracted position by a predetermined amount, the knitting needle is advanced to the standby position. 3. When the knitting needle is advanced from the retracted position by a predetermined amount, the knitting needle is advanced to the reference position or beyond the reference position, and when the knitting needle is made to wait at the standby position, the knitting needle is moved to the reference position. 2. The knitting method according to claim 1, further comprising retracting the knitting needle advanced beyond the reference position to the standby position and then waiting the knitting needle at that position. 4. A device for knitting a flat knitted fabric by advancing and retracting a plurality of knitting needles by an actuator, and a knitting data setting device for setting knitting data, and knitting data set by the setting device. An arithmetic and control circuit that outputs a drive signal that operates the actuator based on the above, and a driver that operates the actuator according to the drive signal, the drive signal including a signal unit that advances the knitting needle by a predetermined amount, and A signal portion for retracting to the rear end position for the stitch after passing the reference position for the stitch, a signal portion for further advancing by a predetermined amount from the retracted position, and then waiting for between the reference position and the rear end position. A knitting device for a flat knitted fabric, including a signal section for holding the position. 5. The knitting device according to claim 4, wherein the signal unit that advances the knitting needle from the retracted position by a predetermined amount includes a signal unit that advances the knitting needle to the standby position. 6. The signal unit for advancing the knitting needle from the retracted position by a predetermined amount includes a signal unit for advancing the knitting needle to the reference position, and the signal unit for waiting the knitting needle at the standby position is at the reference position or The knitting device according to claim 4, further comprising: a signal unit that retracts the knitting needle that has advanced beyond the reference position to the standby position, and a signal unit that causes the knitting needle to wait at the position.