JPH05321103A - Method for controlling drawing tension of knitted fabric - Google Patents

Abstract

PURPOSE:To obtain a method for controlling the drawing of a knitted fabric in which the setting of the tension for drawing the knitted fabric can be finished with a low frequency regardless of the operation and nonoperation of the respective devices for drawing. CONSTITUTION:A signal for instructing the operation or nonoperation of one or two or all of a drawing tension controller (11), a knitting and drawing device (3), a main drawing device (2) or sub-drawing device (1) is sent to the corresponding drawing device (1, 2 or 3) for each arrival of the knitting and drawing device (3) at a prescribed position in the vertical direction and the setting of a value of a drawing tension applied with the respective drawing devices to the tension controller (11) is carried out at a sharing ratio based on the total tension applied to the knitted fabric.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a pulldown tension of a knitted fabric in a flat knitting machine.

[0002]

2. Description of the Related Art In a flat knitting machine, knitting is continued while a pulling tension is applied to a knitted fabric by a knitting fabric lowering device arranged downstream of a needle bed. In recent flat knitting machines, the knitting fabric lowering device is composed of a plurality of knitting fabric lowering means. For example, in the flat knitting machine shown in FIG. 1, three-stage knitted fabric lowering means including a set-up lowering device 3 slidable in the vertical direction, a main lowering device 2 operating at a fixed point, and a sub lowering device 1 operating at a fixed point. The knitted fabric 4 is pulled down by configuring a knitted fabric lowering device. In this case, the pulling-down tension of each pulling-down device is set for each pulling-down device corresponding to the operation or non-operation of each pulling-down device of the knitting data of the knitted fabric.

[0003]

In the prior art, the pulling down tension applied to the knitted fabric is adjusted by the pulling down tension applied to the knitting fabric according to the knitting data of the knitting fabric. It was set as a value. Therefore, it is necessary to divide the knitted fabric into several zones in the course direction corresponding to the operation and non-operation of each pulling device, and calculate and set the set value of the knitting tension for each zone.

An object of the present invention is to provide a knitting fabric pull-down control method which can set the pull-down tension of a knitted fabric with a small number of times regardless of whether each pulling device is operated or not.

[0005]

DISCLOSURE OF THE INVENTION An object of the present invention is to lower a knitted fabric by a set-up / down device slidably movable in the vertical direction, a main-down device operated at a fixed point, and a sub-down device operated at a fixed point. And a method of controlling the pull-down tension of a knitted fabric with a flat knitting machine having a pull-down tension control device for controlling the pull-down tension of each pull-down device of the knitting fabric pull-down device, wherein the set-up pull-down device is at a predetermined vertical position. Every time when the pull-down tension control device reaches the pull-down device, the pull-down tension control device issues a signal to the corresponding pull-down device to activate or deactivate any one, two, or all of the set-up pull-out device, the main pull-down device, and the sub-pull-down device. And setting the value of the pull-down tension provided by each pull-down device to the pull-down tension control device. It is achieved by the knitted fabric pull-down tension control method which is characterized in that in sharing ratio relative to the total tension applied to the knitted fabric.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings showing an embodiment of a pull-down tension control method according to the present invention. Figure 1
2 and 2 are drawings showing an example of a knitting fabric lowering device of a flat knitting machine. 1 shows a drawing of the pulling-down device of the flat knitting machine as seen from the front, and FIG. 2 shows a drawing of the pulling-down device of the flat knitting machine as seen from the side. In FIG. 1, 1 is a sub pulling device, 2 is a main pulling device, 3 is a set-up pulling device, and 4 is a knitted fabric. In FIG. 2, 5 is a nip roll of the sub-pulling device, 6 is a nip roll of the main pulling device, 7 is a removing device, 8 is a yarn, 9 is a needle bed, and 10 is a yarn feeding device.

The principle of knitting a knitted fabric by a flat knitting machine will be described with reference to FIGS. 1 and 2. The yarn 8 for knitting the knitted fabric is supplied by the yarn supplying device 10 while reciprocating on the needle bed 9. A groove is cut in the needle bed 9, a large number of unillustrated knitting needles are provided therein, and the yarn feeding device 10 is synchronized with the operation of the yarn feeding device 10.
The knitting needle reciprocates in a direction perpendicular to the operation of (1) and draws the yarn 8 to form a loop and knit the knitted fabric 4. The knitted fabric 4 is gradually pulled downward by each pulling device.

Next, the operation of each knitted fabric lowering device will be described. At the start of knitting, the set-up and lowering device 3 is elevated from the origin position E to the position A. In this state, the first knitted fabric 4 for one course is knitted. Next, the set-up and pull-down device 3 descends, and the hooks provided on the set-down device 3 move the knitted fabric 4
Grasp the loop of the first course of. After that, a loop of the knitted fabric 4 is sequentially formed, and the knitted fabric 4 is gradually lowered downward by the set-up and lowering device 3. When the set-up and pull-down device 3 is lowered to the position B, the nip roll 5 of the sub-pull-down device 1 moves from the solid line position to the dotted line position, and the sub-pull-down device 1 holds the knitted fabric 4. After that, the knitted fabric 4 is pulled down by the set-up pulling-down device 3 and the sub pulling-down device 1. When the set-up and lowering device 3 is lowered to the position C,
The nip roll 6 of the main pull-down device 2 moves from the position indicated by the solid line to the position indicated by the dotted line, and the main pull-down device 2 also moves to the knitted fabric 4.
Hold. After that, the knitted fabric 4 is pulled down by the set-up pulling-down device 3, the sub-pulling-down device 1 and the main pulling-down device 2. Next, when the set-up and lowering device 3 is lowered to the position D, the stitch removing device 7 is activated and the knitted fabric 4 is removed from the set-up and lowering device 3. Thereafter, the knitted fabric 4 is pulled down by the sub pulling-down device 1 and the main pulling-down device 2.

Table 1 shows the relationship between the positions of the set-up and pull-down devices described above and the operation and non-operation of the respective pull-down devices. In Table 1, the symbol ◯ indicates the operation of each pulling device, and the symbol x indicates the non-operation of each pulling device.

[0010]

[Table 1]

Next, a method for controlling the pulling down tension of the knitted fabric will be described with reference to FIGS. 3 and 4. FIG. 3 is a block diagram showing a method for controlling the knitting fabric pulling down tension according to the prior art.
In FIG. 3, 11 is a pull-down tension control device, 12 is knitting fabric course information given from a knitting fabric designing device (not shown),
13 is information on whether the knitting fabric lowering device is operated or not, which is given from the knitting fabric designing device, 14 is a tension set value for each knitting fabric lowering device set by an operator, 15 is operation or non-operation of the knitting fabric lowering device. Control signal, 16 is a pull-down tension control signal. The operator divides the knitted fabric into several zones based on the course information 12 and the information 13 on whether the lowering device is operating or not, which is given as data from the knitting fabric designing device, which is not shown in the figure, and divides the knitting fabric into several zones individually The tension set value 14 is given. The pull-down tension control device 11 controls the operation, non-operation and pull-down tension of each pull-down device based on the set value and data provided.

FIG. 4 is a block diagram showing a pull-down tension control method according to the present invention. In the figure, 17 is a set value of the pull-down tension of the knitted fabric set for each knitted fabric, 18 is a share ratio of the pull-down tension of each pull-down device, and 19 is a position of the set-up pull-down control device realized by an optical position sensor, for example. Indicates information. The pull-down tension control device 11 is knitted fabric course information 1 given from a knitted fabric design device (not shown).
2. The set value 17 of the pulling down tension of the knitted fabric, which is set by the knitting fabric unit by the operator, the sharing ratio 18 of each pulling down device, and the position information of the set up pulling down device provided from the position sensor (not shown). From 19 control the actuation, deactivation and pulldown tension of each pulling device.

An example of the knitting fabric pull-down tension control method when knitting the formed knitted fabric shown in FIG. 5 will be described below. FIG. 5 shows an example of a knitted fabric for molding, 20 is a set-up portion, 21 is a rubber knitted portion, 22 is a body portion, 23 is a stitch reduction portion, and 24 is a discarded knitted portion. A to E show the positions of the set-up and lowering device 3 corresponding to FIGS. 1 and 2. Table 2 is an example of set values of tensions applied by the respective pulling-down devices for knitting the knitted fabric of FIG. 5 by the pull-down tension control method of the prior art. In this example, the pull-down tension applied to the knitted fabric is constant at 6 kg (when knitting the knitted fabric with 300 needles), the knitted fabric is divided into four as shown in FIG. Accordingly, it is necessary to calculate and set the pull-down tension for each pull-down device for each divided area.

[0014]

[Table 2]

In the knitted fabric pull-down tension control method according to the present invention, the pull-down tension applied to the knitted fabric is set to a constant value (for example, 6 kg in the knitted fabric of FIG. 5), and the tension distribution ratio is 1: 2: 2, that is, the sub-pull-down device. It is set to 1 for 1, the main pulling device 2 for 2, and the set-up pulling device 3 for 2 so that this distribution ratio is applied to each active pulling device. For example, when only the set-up pulling-down device 3 operates, a tension of 6 kg is applied to the knitted fabric by the set-up pulling-down device 3 and the main pulling-down device 2
Alternatively, when the set-up pulling device 3 does not operate, the sub-pulling-down device 1 gives a tension of 2 kg to the knitted fabric, and the set-up pulling-down device 3 or the main pulling-down device 2 gives a tension of 4 kg. If all the three-stage pulling down devices are activated, the sub pulling down device 1 is 1.2 kg, and the main pulling down device 2 is 2.4 k.
g, the tension of 2.4 kg is applied to the knitted fabric by the set-up and lowering device 3. Therefore, by setting only the pull-down tension applied to the knitted fabric and the distribution ratio, all tensions during knitting of the knitted fabric can be controlled.

[0016]

According to the method for controlling the knitting fabric lowering tension according to the present invention, the knitting fabric lowering tension can be set only a small number of times, and the tension of the knitting fabric can be constantly controlled at a constant level. Even when it is desired to reduce the tension of the ground in accordance with the number of operating knitting needles, the tension can be easily changed, and the knitted fabric has a uniform loop size and a beautiful knitted fabric can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an example of the configuration of a knitted fabric lowering device of a flat knitting machine.

FIG. 2 is a schematic side view of the knitted fabric lowering device shown in FIG.

FIG. 3 is a block diagram showing a conventional knitted fabric pull-down tension control method.

FIG. 4 is a block diagram showing an example of a knitting fabric lowering tension control method according to the present invention.

FIG. 5 is a plan view of a knitted fabric showing divided areas of the knitted fabric when knitting a molded knitted fabric with rubber.

[Explanation of symbols]

 1 ... Sub pull-down device 2 ... Main pull-down device 3 ... Set-down pull-down device 4 ... Knitted fabric 5 ... Sub pull-down device nip roll 6 ... Main pull-down device nip roll 7 ... Grabbing device 8 ... Thread 9 ... Needle bed 10 ... Thread feeding Device 11 ... Pull-down tension control device 12 ... Course information 13 ... Pull-down device operation / non-operation information operation 14 ... Pull-down device unit pull-down tension set value 15 ... Pull-down device operation control signal 16 ... Tension value control signal 17 ... Pull-down tension setting value for each unit 18 ... Tension sharing ratio of pull-down device 19 ... Position information of set-up / draw-down device 20 ... Set-up part 21 ... Rubber knitting part 22 ... Body part 23 ... Eye-reducing part 24 ... Discard knitting part

Claims (1)

[Claims] 1. A knitting fabric lowering device that is slidably movable in the vertical direction, a knitting fabric lowering device including a main lowering device that operates at a fixed point and a sub lowering device that operates at a fixed point, and each of the knitting fabric lowering device. In a method of controlling a pulling down tension of a knitted fabric by a flat knitting machine having a pulling down tension control device for controlling a pulling down tension of a pulling down device, the pulling down tension control is performed every time the set-up pulling down device reaches a predetermined position in the vertical direction. The device issues a signal indicating the activation or inactivation of any one, two or all of the set-up pulling device, the main pulling device or the sub pulling device to the corresponding pulling device, and by each of the pulling devices. The setting of the applied pull-down tension value to the pull-down tension controller is based on the total tension applied to the knitted fabric. A method for controlling the pull-down tension of a knitted fabric, which is performed at an equal share ratio.