JP5698491B2 - Yarn length control device and control method in flat knitting machine - Google Patents

Description

  The present invention relates to yarn length control in a flat knitting machine.

  A flat knitting machine is generally provided with two needle beds on the front and back, and there is also a flat knitting machine with a total of four needle beds on the front and rear. Compare the measured yarn length with the target value so that the size of the knitted fabric knitted by the flat knitting machine is not disturbed, in other words, compare the actual loop length with the loop length target value. It is known to feed back to the peak correction value (Patent Document 1: JP3085638B). And in patent document 1, a consumption yarn length is measured with a rotary encoder etc., and a frequency correction value is updated according to the difference with a target value. Washiyama is a cam of the carriage of the flat knitting machine, and is a cam that controls the loop length of the stitch, that is, the yarn length per stitch, and is controlled by an actuator such as a Wichiyama motor.

  In Patent Document 1, a degree correction value is stored for each combination of a degree and a thread. In addition, in the front and back needle beds, the degree correction value is changed by the same amount. For example, if the degree correction value is updated during knitting on the front needle bed, the degree correction value for the rear needle bed is appropriately set in advance by updating the degree correction value for the rear needle bed by the same change. To update the value.

  The inventor has noted that when the needle bed is different, the amount of change in the degree correction value for changing the loop length by the same amount is different. For example, in a flat knitting machine with four front and back needle beds, the upper and lower needle beds have different angles from the horizontal surface of the needle bed. Therefore, the loop length of the stitch formed on the upper needle bed changes to the degree correction value. On the other hand, the loop length of the stitch formed by the lower needle bed tends to change rapidly with respect to the change in the degree correction value. Here, if the upper and lower needle bed knitting correction values are changed in common, the loop length changes excessively in the knitting of the lower needle bed, and the change in the loop length is small in the knitting of the upper needle bed. The correction value may not be updated. In this case, the correction value is unstable and the loop length is not stable. Further, even after the degree correction value for the lower needle bed reaches the lower limit due to filling, the degree correction value for the upper needle bed may be decreased. Then, the degree correction value of the lower needle bed is less than the lower limit, and an error occurs. Note that the difference in the change in loop length per change in the degree correction value is significant between the upper and lower needle beds, but also exists between the upper and lower needle beds.

  There are the following other problems. When the rib pattern is changed, for example, the rib pattern is changed from 2 × 2 to 3 × 3 in the knitting of the rib knitted fabric, the consumed yarn length may change suddenly. Even if the yarn tension varies during rib knitting, the consumed yarn length may change suddenly. If the mountain correction value is updated each time, the texture of the knitted fabric is likely to change. However, if the frequency correction value is not updated, the loop length deviates from the target, and the length of the knitted fabric tends to be disturbed. When garter knitting is performed on a four-bed machine, the garter knitting of the front knitted fabric is performed on the lower front bed and the upper rear bed, and the garter knitting of the rear knitted fabric is performed on the lower lower bed and the front upper bed. Since the optimum degree correction value differs between the front course and the back course, the stitch size is different, and stripes may occur.

JP3085638B

An object of the present invention is to enable knitting so that the loop lengths of stitches formed in each needle bed are equal even if the change in the loop length per change in the degree correction value varies depending on the needle bed. .
Further, the problem of the present invention is that even if the change in the loop length per change in the degree correction value varies depending on the needle bed, the stitch can be knitted with the target loop length, and further , the texture in the rib knitting is made constant, The purpose is to prevent the knitted fabric from being disturbed.

The present invention relates to a flat knitting machine having at least a pair of front and back needle beds, and controls the stitch cams of each needle bed according to the stitch correction value, and the loop length of a stitch formed by the flat knitting machine. And the yarn length control device of the flat knitting machine that updates the degree correction value according to the difference between the loop length target value of the stitch,
Whether to update the degree correction value with a common change for each needle bed or to update the degree correction value with a different change depending on the needle bed,
According to the above setting, the stitch angle correction value of each needle bed is updated, and the setting for updating the stitch angle correction value by a different amount depending on the needle bed is performed so that the loop lengths of stitches formed in each needle bed are equal. A mountain correction unit is provided every time the mountain correction value is updated .

The present invention also relates to a flat knitting machine having at least a pair of front and back needle beds, wherein the stitch cams of each needle bed are controlled according to the stitch correction value, and a stitch loop formed by the flat knitting machine is provided. In the yarn length control method in a flat knitting machine that updates the degree correction value according to the difference between the length and the target value of the loop length of the stitch,
Setting whether to update the degree correction value with a common change for each needle bed or to update the degree correction value with a different change depending on the needle bed;
In the setting for updating the stitch crest correction value of each needle bed according to the above setting by the cradles correction unit, and updating the crest correction value by a different amount depending on the needle bed, the loop length of the stitch formed in each needle bed And a step of updating the degree correction value so that becomes equal to each other.

In the present invention, it is possible to set whether to update the degree correction value for each needle bed with a common change amount or to update the degree correction value with a different change amount depending on the needle bed. Accordingly, when the degree correction value is updated with a common change, the degree correction value can be updated even for the degree of the needle bed that is not used in knitting. When the stitch correction value is updated with a different change, the stitch loop length differs depending on the needle bed or cannot be matched with the target loop length, and the stitch correction value can be prevented from becoming unstable. The knitted fabric's length can be maintained while maintaining the same texture in the rib knitting by changing the amount of change in the stitch correction value between the needle bed for knitting the rib knitted fabric and the needle bed for knitting the back stitch. Etc. can be prevented. Furthermore, even when the amount of change in the stitch correction value for forming a stitch having the same loop length differs depending on the needle bed, the loop length of the stitch formed in each needle bed can be made uniform. In this specification, the description related to the yarn length control device also applies to the yarn length control method, and the description related to the yarn length control method also applies to the yarn length control device.

Further, the present invention relates to a flat knitting machine having at least a pair of front and back needle beds, wherein the stitch cams of each needle bed are controlled according to the stitch correction value, and the stitch loop formed by the flat knitting machine is used. Depending on the difference between the stitch length and the loop length target value, the degree correction value is updated, and the degree correction value is updated with a common change for each needle bed, or differs depending on the needle bed. It is possible to set whether to update the degree correction value according to the change amount, and the degree correction unit updates the degree correction value of each needle bed according to the above setting, and the degree change depending on the needle bed. In the setting to update the correction value, for rib knitting, only the needle bed correction value for knitting the rib back is updated, and the needle bed correction value for knitting the rib face is not updated. Fix it. The front face of the rib is more conspicuous than the back face, and changes in the loop length are easily felt as changes in the texture of the knitted fabric. Therefore, the texture is stabilized by fixing the correction value of the needle bed for knitting the face. If the change in the correction value of the needle bed for knitting the face is fixed , the consumed yarn length of the rib knitted fabric is disturbed from the target value, and this disturbance is increased by increasing the correction value of the needle bed for knitting the rib back stitch. Correct by changing. Therefore, the entire rib knitted fabric is knitted with the target consumed yarn length. And since the back of the rib is inconspicuous, even if the degree correction value is greatly changed, the change in texture is not felt. Further, since the consumed yarn length of the rib knitted fabric is controlled so as to match the target value, the size of the knitted fabric is not disturbed.

More preferably , the degree correction unit obtains a ratio of a change in the loop length of the stitch to a change in the degree correction value for a plurality of needle beds, and the obtained ratio is stored in the storage unit and varies depending on the needle beds. In the setting of updating the degree correction value with the change, the degree correction unit updates the degree correction value with the change according to the ratio. Obtaining for a plurality of needle beds means, for example, obtaining for each needle bed, obtaining for one of the lower needle beds and one of the upper needle beds, and the like. The amount of change in the degree correction value for changing the loop length is the same depending on the needle bed. Therefore, if the ratio of the change in the loop length of the stitch to the change in the degree correction value is stored and the degree correction value is updated according to the stored ratio, the loop length changes sharply with respect to the change in the degree correction value. By applying a small change in the needle bed to be applied and applying a large change in the needle bed in which the loop length changes only slightly with respect to the change in the correction value, the optimum correction value can be updated.

  Particularly preferably, the flat knitting machine has four needle beds in the front and rear, upper and lower needle beds, and in the setting for updating the stitch correction values by different changes depending on the needle beds, at least the needle stitch correction values of the upper and lower needle beds and the lower Update the front and rear needle bed correction values with different changes. In flat knitting machines with four front and back needle beds, for example, the upper needle bed and the lower needle bed have different needle bed slopes, and the stitches when the stitch correction value is changed by the same amount are the same. The change in loop length is also different. Therefore, the effect of the difference between the upper and lower needle beds can be corrected by updating the upper needle bed correction value and the lower front and rear needle bed correction values with different changes.

The figure which shows typically arrangement | positioning of the needle bed of the front and back, upper and lower, and a carriage with a flat knitting machine A diagram schematically showing the cams for each needle bed in the carriage Block diagram of the yarn length control device of the embodiment A diagram schematically showing the degree correction table Flowchart showing a loop length routine in the embodiment Flow chart of degree correction subroutine A in the embodiment Flow chart of degree correction subroutine B in the embodiment Flow chart of degree correction subroutine C in the embodiment

  In the following, an optimum embodiment for carrying out the invention will be shown. The scope of the present invention should be construed in consideration of the possibility of modification by well-known techniques in the description of the scope of claims.

  1 to 8 show an embodiment and its modifications. 1 and 2 show the structure of the flat knitting machine 2, and the flat knitting machine 2 has four needle beds, a lower front needle bed df and a lower rear needle bed dr, an upper front needle bed uf and an upper rear needle bed ur. I have. A flat knitting machine provided with two needle beds composed only of the lower needle beds df and dr may be used. A rail 4 is provided above the needle beds df to ur, and a plurality of yarn feeders 6 move along the rails 4 to supply yarns to needles (not shown) of the needle beds df to ur. Further, the carriage c moves on the needle bed df to ur to operate the needles on the needle bed. g is a trick gap and is a place where the needles of the needle beds df to ur form stitches. The front / rear and upper / lower sides of the flat knitting machine 2 are defined as shown in FIG. 1, and the side with the front needle beds df and uf is the front and the side with the rear needle beds dr and ur is the rear. The upper side in the normal sense is the upper side, and the lower side in the normal sense is the lower side.

  The carriage c includes a plurality of cam systems 8 and operates the needles of the needle beds df to ur. In the cam system 8, the cams 9 and 10 are cams for controlling the loop length of the stitch, in other words, the stitch size. The loop length means the yarn length per stitch, and the stitch size means the vertical and horizontal sizes of the stitch. The mountain cams 9 and 10 control the pull-down amount of the needle holding the thread, and are controlled by mountain mountain motors M1 to M24 (FIG. 3) provided for each mountain. The degree mountain cam 9 is a degree mountain cam in the forward direction, and the degree mountain cam 10 is a degree mountain cam in the backward direction. In the embodiment, the needle beds df to ur are four in the front, rear, upper and lower directions, and each needle bed is provided with, for example, three cam systems 8. Therefore, the total number of the cams 9 and 10 is 24.

  Reference numeral 12 denotes a controller of the flat knitting machine 2, and 16 denotes an encoder that measures the length of the yarn supplied to the yarn feeder 6, for example, a rotary encoder. The yarn length control device 14 is provided in the controller 12 except for the encoder 16 and the degree motors M1 to M24. As shown in FIG. 3, the comparison unit 18 compares the yarn length measured by the encoder 16 and the target yarn length, for example, for each course of knitting. The degree crest correction unit 20 updates the degree crest correction table 22 using the comparison result in the comparison unit 18, and the carriage c is reversed at the end of the course by the degree crest correction value stored in the degree crest correction table 22, for example. For example, the degree motors M1 to M24 are controlled.

The setting unit 24 performs setting relating to the degree correction, and specifically, whether the degree correction value is updated by a separate change amount for each of the front, rear, upper, and lower needle beds,
-Update all the needle bed correction values for these needle beds with a common change,
-Enter whether to update the degree correction values of the two lower needle beds with a common change, and update the degree correction values of the upper two needle beds with a common change. In the last case, the amount of change in the degree correction value differs between the lower needle bed and the upper needle bed. The setting unit 24 receives a user input from, for example, the controller 12 of the flat knitting machine 2 or discriminates settings related to the degree correction from the knitting data. The conversion table 26 stores the amount of change in the degree correction value for changing the loop length by the same amount for each of the front and rear needle beds df to ur. The stored value in the conversion table 26 may be a change itself for changing the loop length by a fixed value or a relative value of a change based on any one of the needle beds. Instead of the change in the degree correction value, the reciprocal thereof, that is, the change in the loop length when the degree correction value is changed by a certain amount, the relative value of the change in the loop length, or the like may be stored.

  FIG. 4 shows the configuration of the degree correction table 22. One degree correction table 22 is provided for each of the four front and rear needle beds, and each degree correction table 22 includes an outward degree 9 for each of the cam systems C1, C2, and C3. A degree correction value is stored for the degree 10 of the return trip. In the embodiment, for example, seven types of yarns can be used, and a degree correction value is stored for each yarn, and the degree correction value has an upper limit and a lower limit.

  FIG. 5 shows the loop length routine algorithm. The loop length routine is executed, for example, once a day when the flat knitting machine 2 is activated, but may be executed once a week or the like. In step 1, a degree correction value for knitting a stitch with the target loop length is obtained for each degree cam 9, 10 of each needle bed. When there are a plurality of yarns, this process is executed for each yarn, for example. Step 1 is the same process as in the prior art, and the content of Step 1 is arbitrary.

  In the process of executing Step 1, it is found how much the yarn correction value is changed and how much the loop length of the stitch is changed. Therefore, the change in the degree correction value for changing the loop length by the same amount is written in the conversion table 26 (step 2). Step 2 may be executed for each yarn, or the difference between the yarns may be ignored. Step 2 is executed, for example, for each of the front and back, upper and lower needle beds. The lower needle beds df and dr are assumed to have the same rate of change in the loop length per change in the degree correction value, and the upper needle beds uf and ur. Alternatively, it may be approximated that the rate of change of the loop length per change in the degree correction value is equal. When approximated in this way, step 2 needs to be executed for at least two upper and lower needle beds. Note that step 2 is a process for executing steps 11 and 12 in FIG. 7, and step 2 may be omitted when the degree corrections A and C in FIGS. 6 and 8 are executed.

  FIG. 6 shows a first embodiment of the degree correction (degree correction A). The degree correction A is executed by interruption during knitting of the knitted fabric, and when step 3 to step 7 are executed, the interruption ends. In step 3, the consumed yarn length is compared with the target yarn length, and a change in the degree correction value for correcting this difference is obtained. In step 4, the setting in the setting unit 24 is checked, and in the case of setting to update the stitch correction value with a common change for the four needle beds df to urn in the front and rear, upper and lower and upper and lower degrees correction table Are updated with a common change (step 5). In this case, the degree correction value is updated with a common change even for the needle bed degree not used in knitting.

  The amount of change in the correction value of the lower and upper needle beds df and dr is made common, and the change of the correction value in the upper and lower needle beds uf and ur is also made common, but the upper and lower needle beds have correction values. Is set to be common, for example, the degree correction values of the lower front needle bed df and the lower rear needle bed dr, or the degree correction values of the upper and lower needle beds uf and ur, Update with the change (step 6). The updated crest correction values are the needle bed for which the consumed yarn length was measured in step 3 and the needle bed on the other side in the front and back sides that are the same as the needle bed. This setting is particularly effective for garter knitting. When garter knitting is performed on the front and back of the tubular knitted fabric using a flat knitting machine with four beds, the front knitted fabric forms the front with the lower front needle bed df, the back stitch with the upper rear needle bed ur, and the rear knitted fabric is the lower A front stitch is formed by the rear needle bed dr and a back stitch is formed by the upper front needle bed uf. If the upper and lower needle bed changes are changed in common, the degree correction value for knitting the front course is updated with the same change in the front and rear needle beds, and the back course is knitted. The degree correction value is also updated with the same change in the front and back needle beds.

  It is possible to set the degree correction table to be updated separately for the front and rear and the top and bottom, in other words, for each needle bed independently of the others. In the case of this setting, the degree correction table is updated only for the needle bed whose consumed yarn length is measured in Step 3 (Step 7).

  7 shows another embodiment of degree correction, and steps 3 and 5 are the same as steps 3 and 5 in FIG. In FIG. 7, when the degree correction value of all needle beds is changed by the same change amount (changed in common), it is changed individually for each needle bed (the degree correction value is changed by the individual change amount for each needle bed). It is assumed that two types of settings can be made, and the setting is checked in step 10. When updating the stitch correction value for each needle bed individually, the change in the stitch correction value is determined according to the conversion table 26 of FIG. 3 for the needle beds other than the needle beds whose consumed yarn length is measured in step 3. . For example, if the conversion table 26 describes a change in the degree correction value per change in the loop length, the degree correction value may be changed according to the ratio of the change in the degree correction value. For example, when the thread length is measured at the needle bed A, and the stored value in the conversion table 26 is a for the needle bed A and b for the needle bed B, the needle bed B has a correction value at the needle bed A. Is multiplied by (b / a) to obtain a change in the degree correction value (step 11). In step 12, the degree correction table for each needle bed is updated according to the obtained change. If the frequency correction value can be updated only discretely, it is preferable to store the fraction generated by the conversion and add it at the next update.

  In the degree correction C in FIG. 8, the same steps 3 and 5 as in FIG. 6 are executed. The degree correction C is applied to the knitting of the rib knitted fabric, and in the setting check in Step 10, it is checked whether the front / rear / upper / lower needle beds are updated in common or individually. In the case of setting to update the crest value in common, in step 20, in the case of knitting other than the rib knitted fabric, step 5 in FIG. When the stitch bed correction value of the needle bed is updated individually and the type of knitted fabric being knitted is a rib, the stitch correction value is updated only for the needle bed knitting the back of the rib, and the rib face The degree correction values of other needle beds such as the needle bed to be knitted are not updated (step 21). However, it is smaller than the needle bed for knitting the rib back surface with respect to the needle bed for knitting the rib face, for example, 3/4 or less, preferably 1/2 or less of the needle bed for knitting the rib back eye. The degree correction value may be updated with the change.

  In step 21 in FIG. 8, the correction value is fixed for the needle bed knitting the rib face, and the texture of the rib knitted fabric is almost determined by the face, so the texture of the rib knitted fabric is kept constant. Be drunk. When the consumed yarn length in the knitting of the rib knitted fabric deviates from the target value, the needle bed knitting correction value for knitting the back stitch is updated so as to eliminate this. Therefore, the consumed yarn length of the entire rib knitted fabric is adjusted to the target value. As a result, it is possible to prevent the size of the knitted fabric from being disturbed. Therefore, as a whole, a rib knitted fabric of a desired size and a desired size can be knitted.

In the embodiment, the flat knitting machine 2 provided with four front and back needle beds has been described, but a flat knitting machine including only the front and back needle beds may be used. In this case, it is corrected that the change in the loop length is not equal between the front needle bed and the rear needle bed even if the degree correction value is updated by the same change. In the four front and back needle beds, the difference in the change in the loop length with respect to the change in the degree correction value is greatest between the upper and lower needle beds. Therefore, the lower front needle bed df and the lower rear needle bed dr are updated with a common degree correction value, the upper front needle bed uf and the upper rear needle bed ur are updated with a common change, and the lower front and rear needle beds df , Dr and the upper and lower needle beds uf, ur are updated with different changes, so that a knitted fabric having a substantially target loop length can be knitted.

2 Flat knitting machine 4 Rail 6 Yarn feed port 8 Cam system 9, 10 Degree cam 12 Controller 14 Yarn length controller 16 Encoder 18 Comparison section 20 Degree correction section 22 Degree correction table 24 Setting section 26 Conversion table

df lower front needle bed dr lower rear needle bed uf upper front needle bed ur upper rear needle bed c carriage g trick gap M1 to M24 degrees mountain motor

Claims (6)

For a flat knitting machine having at least a pair of front and back needle beds, the stitch cams of each needle bed are controlled in accordance with the stitch correction value, and the loop length of the stitch formed by the flat knitting machine, In the yarn length control apparatus that updates the degree correction value according to the difference from the loop length target value,
Whether to update the degree correction value with a common change for each needle bed or to update the degree correction value with a different change depending on the needle bed,
According to the above setting, the stitch angle correction value of each needle bed is updated, and the setting for updating the stitch angle correction value by a different amount depending on the needle bed is performed so that the loop lengths of stitches formed in each needle bed are equal. A yarn length control device in a flat knitting machine, comprising a mountain correction unit that updates a mountain correction value . The degree correction unit determines the ratio of the change in the loop length of the stitch with respect to the change in the degree correction value for a plurality of needle beds, and the calculated ratio is stored in the storage unit.
2. The flat knitting according to claim 1 , wherein in the setting for updating the degree correction value with a different amount depending on the needle bed, the degree correction unit updates the degree correction value with the change according to the ratio. Yarn length control device in the machine. For a flat knitting machine having at least a pair of front and back needle beds, the stitch cams of each needle bed are controlled in accordance with the stitch correction value, and the loop length of the stitch formed by the flat knitting machine, In the yarn length control apparatus that updates the degree correction value according to the difference from the loop length target value,
Whether to update the degree correction value with a common change for each needle bed or to update the degree correction value with a different change depending on the needle bed,
According to the above setting, the stitch angle correction value for each needle bed is updated, and the setting for updating the stitch angle correction value for each needle bed varies. Yarn length control device in flat knitting machine, characterized in that it has a degree correction part that updates only the value and fixes without fixing the degree correction value of the needle bed for knitting the rib face . The flat knitting machine is equipped with four needle beds in the front and back, top and bottom, and in the setting to update the stitch correction value with different changes depending on the needle bed, at least the stitch correction value of the upper and lower needle beds and the lower needle bed The yarn length control device for a flat knitting machine according to any one of claims 1 to 3 , wherein the hill correction value is updated with different changes. For a flat knitting machine having at least a pair of front and back needle beds, the stitch cams of each needle bed are controlled in accordance with the stitch correction value, and the loop length of the stitch formed by the flat knitting machine, In the method of updating the degree correction value according to the difference from the loop length target value,
Setting whether to update the degree correction value with a common change for each needle bed or to update the degree correction value with a different change depending on the needle bed;
In the setting for updating the stitch crest correction value of each needle bed according to the above setting by the cradles correction unit, and updating the crest correction value by a different amount depending on the needle bed, the loop length of the stitch formed in each needle bed And a step of updating the degree correction value so as to be equal to each other , and a yarn length control method in a flat knitting machine. For a flat knitting machine having at least a pair of front and back needle beds, the stitch cams of each needle bed are controlled in accordance with the stitch correction value, and the loop length of the stitch formed by the flat knitting machine, In the method of updating the degree correction value according to the difference from the loop length target value,
  Setting whether to update the degree correction value with a common change for each needle bed or to update the degree correction value with a different change depending on the needle bed;
  In the setting that updates the degree crest correction value of each needle bed according to the setting by the degree crest correction unit and updates the degree crest correction value by a different amount depending on the needle bed, the rib back is knitted with respect to the rib knitting. In a flat knitting machine, wherein only the needle bed correction value is updated, and the needle bed correction value for knitting the rib face is fixed without updating. Yarn length control method.

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