JP2009079322A - Circular knitting machine for double knitting, and method for knitting double fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable knitting of a fabric (a double knitting fabric) provided with a diversified three-dimensional part in a circular knitting machine for double knitting. <P>SOLUTION: The circular knitting machine for double knitting having a cylinder 3 which holds a cylinder needle 7 so as to be able to move up and down, and a dial 4 which is provided at the upper part of the cylinder 3, and holds a dial needle 9 so as to be able to slide along the radial direction wherein the fabric W is knitted down from a knitting point formed by the cylinder needle 7 and the cylinder needle 9 when the cylinder 3 and the dial 4 turn integrally with each other is provided with a down blow jetting part 23 which blow air along the knitting down direction of the fabric W toward the knitting point. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a circular knitting machine for double knitting and a knitting method.

A circular knitting machine capable of double knitting has a cylinder that holds a cylinder needle so as to be movable up and down, and a dial that is provided on the upper part of the cylinder and holds a dial needle so as to be slidable radially outward. The fabric is knitted from a knitting point formed by the cylinder needle and the dial needle when the cylinder and the dial are integrally rotated.
In a circular knitting machine for single knitting (without a dial), a sinker bed is provided at the top of the cylinder, and this sinker bed holds a sinker for suppressing the protrusion of the loop during knitting. It is normal. However, in a circular knitting machine for double knitting, there is no sinker equipment due to space restrictions due to the presence of the dial, and therefore the protrusion of the loop can be dealt with only by applying tensile force to the knitted fabric under the dial. It was normal.

By the way, a circular knitting machine for single knitting may be provided with a stitch amount adjusting device (commonly referred to as “auto stitch”) that changes the amount of movement of a cylinder needle in a direction in which the stitch amount increases (for example, patent document). 1 etc.).
When this stitch amount adjusting device is operated during the knitting of one course, the knitted fabric can provide a large loop area in a part of one course (circumferential direction), so this area is expanded in three dimensions. It will be possible to. Such three-dimensionalization of the fabric is effective, for example, when fitting to the chest of women's clothing, the crotch of men's clothing, or the buttocks regardless of gender.

Even if the stitch amount adjusting device is not used, for example, an elastic yarn is used as a knitting yarn, or the operation of the cylinder needle is specified at a specific timing (a position corresponding to the contour of the region to be three-dimensionalized) using a needle selector. It is also possible to provide a partial three-dimensional portion for the knitted fabric by controlling the non-operating state and making a tack on the fabric side. However, a sharper three-dimensional portion can be provided by adopting a knitting method using a stitch amount adjusting device.
However, this stitch amount adjusting device also has the following circumstances. That is, in a double knitting circular knitting machine for body size, due to space limitations, if a stitch amount adjusting device is to be installed, the number of parts must be reduced accordingly. However, since productivity (fabric knitting efficiency) is reduced in this way, it is normal that no stitch amount adjusting device is provided as a result.
JP-A-7-126965

In general, the conventional circular knitting machine for double knitting does not have a stitch amount adjusting device as described above, and therefore, it is impossible to provide a sharp three-dimensional portion as a knitted fabric.
Not only that, even if a double knitting circular knitting machine is equipped with a stitch amount adjusting device, the double knitting circular knitting machine has no sinker equipment. For this reason, when a large loop is made, this loop may be caught by the dial needle that operates next. In this case, a so-called “cover” wrinkle occurs in the knitted fabric.

As a result, with a circular knitting machine for double knitting, it was impossible to knit a fabric (double knitted fabric) provided with a sharp three-dimensional part.
The present invention has been made in view of the above circumstances, and is a double knitting circular knitting machine capable of knitting a fabric (double knitted fabric) provided with a sharp three-dimensional portion and a knitting method of a double fabric. The purpose is to provide.

In order to achieve the above object, the present invention has taken the following measures.
That is, the circular knitting machine for double knitting according to the present invention includes a cylinder that holds a cylinder needle so as to be movable up and down, and a dial that is provided on an upper portion of the cylinder and holds the dial needle slidably along a radial direction. The fabric is knitted from the knitting point formed by the cylinder needle and the dial needle when the cylinder and the dial are integrally rotated. In the fabric knitting direction with respect to the knitting point, A down blow injection section for blowing along the air is provided.

With such a configuration, the air jetted from the downblow jet section is pressed against the loop that protrudes at the knitting point, and this loop can be prevented from being caught by the dial needle that operates next. .
For this reason, even when the stitch amount adjusting device is equipped, there is no possibility of causing a so-called “cover” wrinkle on the knitted fabric, and as a result, the fabric (double-layered with a sharp three-dimensional portion is provided. Knitted fabric) can be knitted.
In addition, since the method of using air for pressing down the loop can be realized in a simple and compact structure, it can be said that it is suitable for equipment for a double knitting circular knitting machine.

The down blow injection part is preferably provided in an inner space surrounded by the cylinder and the dial.
This makes it possible to effectively push the loop. In addition, it is also possible to provide a down blow injection part in the space outside a cylinder and a dial.
It is preferable that the down blow injection portion is provided at the outer peripheral portion of the lower surface of the dial so as to be directed downward inside the cylinder.

This is advantageous in making the down blow injection unit as close as possible to the loop, and as a result, it is even better to cause an effective pushing action on the loop.
It is preferable that a plurality of down blow injection units be provided at predetermined intervals along the circumferential direction of the dial. In this case, each of the down blow injection units has a main supply path that guides air from the air supply source to the lower part of the dial via the rotation axis of the dial, and a branch that guides air from the main supply path to each down blow injection unit. Air may be supplied depending on the road.

In this way, a reliable and sufficient amount of air can be supplied toward the knitting point.
In this case, the branch path may have an internal passage formed in a bowl shape so as to enter the inside of the dial from the lower surface and exit to the outer peripheral surface with respect to the outer peripheral portion of the dial.
Such a structure is advantageous because an air passage for maintenance (prevention of yarn entanglement, removal of lint, etc.) originally provided on the dial can be used. Of course, this is not limited, and the branch path may be newly provided for the down blow injection section. In any case, since the branch path can be built in the dial, there is an advantage that the structure can be simplified and made compact.

The down blow injection part can also be provided so as to be directed downward in the cylinder on the inner surface of the upper peripheral part of the cylinder.
In the circular knitting machine for double knitting according to the present invention, as described above, it is possible to prevent the loop from being caught by the dial needle that operates next. A stitch amount adjusting device that can be varied in the formation region can be provided.
On the other hand, in the knitting method of the double fabric according to the present invention, the fabric is knitted from the knitting point formed by the cylinder needle and the dial needle, and the fabric is knitted with respect to the loop protruding at the knitting point. The air is blown along, and the loop is pushed into the non-interference position of the dial needle that exits next (that is, the position where it is not caught by the dial needle).

  Air blowing is performed when the movement amount of the cylinder needle is changed in the direction of increasing the stitch amount during knitting of one course.

  In the circular knitting machine for double knitting and the method for knitting a double fabric according to the present invention, a fabric (double knitted fabric) having a sharp three-dimensional part can be knitted.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
1 to 5 show a first embodiment of a circular knitting machine 1 for double knitting according to the present invention. The circular knitting machine 1 according to the first embodiment includes a cylindrical cylinder 3 and a disk-shaped dial 4 provided on an upper portion of the cylinder 3. The cylinder 3 and the dial 4 can be rotated integrally with each other around a rotation shaft 5 passing through the center P of the cylinder 3 and the dial 4 so as to be rotationally driven through transmission means 6 provided on the rotation shaft 5. It has become.

A plurality of cylinder needles 7 are held in the cylinder 3 so as to freely move up and down in an arrangement surrounding the entire outer peripheral surface thereof. A cam holder 8 is provided around the cylinder 3 in a stationary state, and a stitch cam 8 a for causing each cylinder needle 7 to move up and down (knitting operation) at a predetermined timing on the inner peripheral surface of the cam holder 8. Is provided.
A large number of dial needles 9 (the same number as the cylinder needles 7) are radially held from the center on the upper surface of the dial 4 so as to be slidable along the radial direction. An upper cam member 10 is fixedly provided on the upper portion of the dial 4, and a dial cam 10 a for causing the dial needle 9 to move laterally (knitting operation) is provided on the lower surface of the upper cam member 10. ing.

Therefore, when the drive unit 5 integrally rotates the cylinder 3 and the dial 4, the cylinder needle 7 moves up and down following the stitch cam 8a, and the dial needle 9 moves sideways along the dial cam 10a. The fabric W is knitted by feeding the yarn through the striper 12 to the knitting point formed at the intersection of the needle tip (hook portion) of the cylinder needle 7 and the needle tip (hook portion) of the dial needle 9. It is.
The fabric W is hung down through the inside of the cylinder 3 and is taken up by a winding device 16 provided below the cylinder 3 through a suspension frame 15.

The cylinder 3 is provided with cam position switching means 17 such as a swing cam or a needle selector that can change the cam path of the cylinder needle 7 during knitting with respect to the stitch cam 8a. Further, a stitch amount adjusting device 20 is provided that makes the operation amount of the cylinder needle 7 variable within an effective formation region of the knitting point.
The stitch amount adjusting device 20 is configured so that the stitch cam 8 a can be moved up and down in the cam holder 8 by a control motor 21 such as a servo motor or a stepping motor provided outside the cam holder 8.

The stitch cam 8a is divided into a plurality of parts in the circumferential direction of the cylinder 3, and the control motor 21 is individually assigned to all the stitch cams 8a (that is, the same number as the number of divisions of the stitch cam 8a). Control motor 21 is provided). Therefore, by controlling the individual control motors 21 at appropriate timing, the rising position (height) of the cylinder needles 7 of a predetermined arrangement is changed during knitting of one course, and the fabric W to be knitted is A large loop can be generated at a desired location.
In the circular knitting machine 1 according to the present invention, the down blow injection unit 23 is provided in an inner space surrounded by the cylinder 3 and the dial 4. In the first embodiment, the down blow injection portion 23 is provided at the outer peripheral portion of the lower surface of the dial 4 so as to be directed downward in the cylinder 3.

A plurality of down blow jetting parts 23 are provided at predetermined intervals along the circumferential direction of the dial 4. Each down blow injection section 23 includes a main supply path 25 that guides air downward from the air supply source (not shown) and a branch path 26 that guides air from the main supply path 25 to each down blow injection section 23. Air can be supplied.
The main supply path 25 is provided in the center of the rotating shaft 5 along the axis. The branch path 26 has an inner passage 27 formed in a bowl shape so as to enter the inside of the dial from the lower surface of the dial 23 to the outer peripheral surface, and a rotary air valve provided at the lower portion of the rotary shaft 5. An external passage 29 that connects the main supply passage 25 and each internal passage 26 via 28 is formed.

Needless to say, a plurality of internal passages 27 and external passages 29 of the branch passage 26 are provided so as to have a one-to-one correspondence with the respective down blow injection units 23.
As shown in FIG. 3, the nozzle chip 30 is attached or not attached to the tip of the branch path 26 (the outer peripheral surface side of the dial 4), and the down blow injection part 23 having the injection hole 23a is formed here.
The down blow injection unit 23 is preferably provided with an angle θ with respect to the fabric W of 1 to 45 °, and more preferably about 20 °.

The down blow injection unit 23 preferably has a distance L from the tip of the inner surface of the cylinder 3 in the range of 5 to 50 mm.
The down blow injection unit 23 preferably has an arrangement interval in the circumferential direction on the outer peripheral surface of the dial 4 of 20 to 50 mm.
The injection hole 23a of the down blow injection unit 23 preferably has a diameter φ of 1.5 to 3 mm.
The air supply pressure (original pressure) for the down blow injection unit 23 is preferably 3 to 5 kg / cm ² .

Next, a method for knitting a double fabric according to the present invention will be described based on the operation status of the circular knitting machine 1 described above.
Based on the size, stitch amount, yarn gauge, knitting structure, knitting schedule, etc. of the fabric W to be knitted, the cylinder 3 and the dial 4 are rotated and yarns are fed to start knitting.
In the fabric W to be knitted, for example, when there is a portion to be three-dimensional, such as a chest of women's clothing, a crotch portion of men's clothing, or a buttocks regardless of gender, an elastic yarn can be used as a knitting yarn, Alternatively, using a needle selector, the operation of the cylinder needle is controlled to a non-operating state at a specific timing (a position corresponding to the contour of the region to be three-dimensionalized) to make a tack.

However, in the case of providing a sharper three-dimensional part, the stitch amount adjusting device 20 is operated (by controlling a predetermined control motor 21), and a large loop area is formed in a part of one course (circumferential direction). To be provided.
In such a case, air is supplied from the air supply source to the down blow injection unit 23 via the main supply path 25 and the branch path 26 (external passage 29 and internal passage 27), and the down blow injection unit 23 Air is spouted along the knitting point in the direction in which the fabric W is knitted down.

If it does in this way, as shown in FIG. 5, it will come to hold | suppress the loop which the air injected from the down blow injection part 23 protrudes at a knitting point, and this loop will be hooked by the dial needle 9 which operate | moves next. It will be prevented. Further, external air is sucked into the circumferential gap formed between the upper peripheral portion of the cylinder 3 and the outer peripheral portion of the dial 4 so that this air flow further suppresses the protrusion of the loop. Works.
Therefore, a so-called “cover” wrinkle does not occur on the knitted fabric W, and a fabric having a sharp three-dimensional part (double knitted fabric) is knitted.
[Second Embodiment]
FIG. 6 shows a second embodiment of the circular knitting machine 1 for double knitting according to the present invention. In the circular knitting machine 1 according to the second embodiment, a down blow injection unit 23 is provided in a space outside the cylinder 3 and the dial 4. Other configurations and operational effects are substantially the same as those in the first embodiment.
[Third Embodiment]
FIG. 7 shows a third embodiment of the circular knitting machine 1 for double knitting according to the present invention. In the circular knitting machine 1 of the third embodiment, the down blow injection unit 23 is provided on the inner surface of the upper peripheral portion of the cylinder 3 so as to face the inside and lower side of the cylinder 3. A plurality of down blow injection parts 23 are provided at predetermined intervals along the circumferential direction of the cylinder 3.

In the third embodiment, in order to supply air to the down blow injection unit 23 provided in the cylinder 3, a rotary joint 37 having a large-diameter ring shape is provided between the lower part of the cylinder 3 and the knitting machine base 36. The air from the air supply source (not shown) is temporarily supplied to the intake portion 39 provided on the outer ring 38 on the fixed side of the rotary joint 37.
Then, air is guided to the inside of the cylinder 3 through the external passage 29 from the rotation-side inner ring 41 that is airtightly held inside the outer ring 38 via the O-ring 40, and an internal passage formed in the cylinder 3. 27, the air is supplied to the individual down-blow injection units 23.

The circumstances in which the branch path 26 is formed by the internal passage 27, the external passage 29, and the like are substantially the same as in the first embodiment. In addition, the fact that the nozzle chip 30 is attached or not attached to the tip of the branch path 26 (upper inner peripheral surface side of the cylinder 3) and the down blow injection portion 23 having the injection hole is formed here is also the first. This is substantially the same as in the first embodiment.
In order to facilitate the attachment of the nozzle tip 30, the upper inner peripheral surface of the cylinder 3 may be formed by another part 42. Other configurations and operational effects are substantially the same as those in the first embodiment.
[Other Embodiments]
The present invention is not limited to the above-described embodiments, and can be appropriately changed according to the embodiments. For example, an opening / closing control means (such as an electromagnetic valve) may be provided at an appropriate position with respect to the branch path 24 for guiding air from the air supply source to the down blow injection unit 23.

By adopting such a configuration and appropriately controlling the operation of the opening / closing control means during knitting, air can be supplied at an appropriate timing toward a required knitting point. In this case, there is no waste in air supply, so that the advantage that the air supply source can be made compact is obtained.
[Comparative example]
The circular knitting machine 1 and the knitting method according to the present invention suppress the protrusion of the loop by blowing air along the direction in which the fabric W is knitted down. Therefore, it can be realized structurally simple and compact, and can be said to be suitable for a configuration as a circular knitting machine for double knitting, but it is also possible to mechanically suppress the protrusion of the loop instead of this air blowing.

For example, in the first comparative example shown in FIG. 8, the inner surface of the cylinder 3 is provided with a free roller 50 that is spring-biased radially inward. A downward tension is applied, and this suppresses the protrusion of the loop.
The second comparative example shown in FIG. 9 has a structure in which an insulator rod 51 is provided on the inner surface of the cylinder 3 so as to fall inward, and a free roller 52 is provided at the tip of the insulator rod 51. Accordingly, the force that causes the cocoon basket 51 to fall gives a downward tension to the fabric W, thereby suppressing the loop protrusion.

  In the third comparative example shown in FIG. 10, nip rollers 53 and 54 are provided between the inner surface of the cylinder 3 and the lower surface of the dial 4, and at least one of the nip rollers 53 and 54 is rotationally driven to A downward tension is applied, and this suppresses the protrusion of the loop.

FIG. 5 is an enlarged view showing a part (around the dial) of FIG. 4. FIG. 5 is an enlarged view showing a part of FIG. 4 (around the cylinder). It is the enlarged view which showed a part (around a down blow injection part) of FIG. It is the partial crushing side view which showed 1st Embodiment of the circular knitting machine for double knitting which concerns on this invention. It is the schematic diagram explaining the condition which implements the knitting method of the double fabric which concerns on this invention using the circular knitting machine shown in FIG. It is the schematic diagram which demonstrated the condition which implements the knitting method of the double fabric which concerns on this invention using 2nd Embodiment of the circular knitting machine for double knitting which concerns on this invention. It is the sectional side view which showed the part (around a cylinder) about 3rd Embodiment of the circular knitting machine for double knitting which concerns on this invention. It is the schematic diagram which showed the 1st comparative example. It is the schematic diagram which showed the 2nd comparative example. It is the schematic diagram which showed the 3rd comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circular knitting machine 3 Cylinder 4 Dial 7 Cylinder needle 9 Dial needle 20 Stitch amount adjustment device 23 Down blow injection part 25 Main supply path 26 Branch path 27 Internal path W Fabric

Claims (9)

A cylinder (3) for holding the cylinder needle (7) movably up and down, and a dial (4) provided on the top of the cylinder (3) for slidably holding the dial needle (9) along the radial direction And the fabric (W) is knitted from the knitting point formed by the cylinder needle (7) and the dial needle (9) when the cylinder (3) and the dial (4) are integrally rotated. In the knitting machine,
A double knitting circular knitting machine, characterized in that a down blow injection section (23) is provided for blowing air along the knitting point of the fabric (W) to the knitting point.   The double knitting circular knitting machine according to claim 1, wherein the down blow injection section (23) is provided in an inner space surrounded by the cylinder (3) and the dial (4).   3. The circular knitting machine for double knitting according to claim 2, wherein the down blow injection part (23) is provided at the outer peripheral part of the lower surface of the dial (4) so as to be directed downward in the cylinder (3). .   A plurality of the down blow injection sections (23) are provided at predetermined intervals along the circumferential direction of the dial (4), and each of the down blow injection sections (23) is supplied with air from an air supply source. Through the rotation axis of the dial (4), the main supply path (25) for guiding the dial (4) downward, and the branch path (25) for introducing air from the main supply path (25) to each down blow injection section (23) 26). The double knitting circular knitting machine according to claim 2 or 3, wherein air can be supplied in accordance with (26).   The branch path (26) has an internal passage (27) formed in a bowl shape so as to enter the dial (4) from the lower surface to the outer peripheral surface of the outer periphery of the dial (4). The circular knitting machine for double knitting according to claim 4, wherein:   The double knitting circle according to claim 2, wherein the down blow injection part (23) is provided on the inner surface of the upper peripheral part of the cylinder (3) so as to be directed downward in the cylinder (3). Knitting machine.   The stitch amount adjusting device (20) is provided, which makes the operation amount of the cylinder needle (7) and / or the dial needle (9) variable within an effective formation region of the knitting point. A circular knitting machine for double knitting according to any one of claims 6 to 6.   While the fabric (W) is knitted from the knitting point formed by the cylinder needle (7) and the dial needle (9), the fabric (W) is knitted along the loop protruding at the knitting point. A method of knitting a double dough, characterized in that air is blown and the loop is pushed into the non-interference position of the dial needle (9) that exits next.   9. The knitting of a double fabric according to claim 8, wherein the air blowing is carried out when the amount of movement of the cylinder needle (7) is changed in the direction of increasing the stitch amount during knitting of one course. Method.

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