JP2012036531A - Compound needle of flat knitting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compound needle of a flat knitting machine in which it can be hard for a slider to move back by a tensile force to a lower part of a tooth port to a former loop even when a state where a tongue is relatively lifted up is temporary kept for moving a hook relatively so as to be closed.SOLUTION: A bottom of a tongue 6 with a step portion 6e between a slidable contact part 6c and an abutment part 6d has a shape more recessed upward than a conventional shape 6f. A stitch held by an upper edge 6a receives a tensile force to a lower part of a tooth port 8. The tensile force to the stitch substantially coincides with the direction that the abutment part 6d abuts on a flat face 4c. Thus, a component force to the direction along the flat face 4c hardly occurs and it is hard for a slider 5 to move back. If the abutment part 6d is in an arc shape, only the component force to the direction which is always perpendicular to a flat face 4b occurs while a component force to the direction along the flat face 4b does not occur, so that it becomes harder for the slider 5 to move back.

Description

  The present invention relates to a compound needle for a flat knitting machine which is accommodated in a needle groove formed on a needle bed of a flat knitting machine and used for knitting a knitted fabric, and a hook is opened and closed with a slider.

  Conventionally, in a flat knitting machine, a composite needle that opens and closes a hook with a slider is used as a knitting needle in order to reduce the size or improve productivity. In the compound needle, the needle body having a hook at the front end slides in the needle groove, and the slider accommodated in the slider groove formed in the needle body moves relative to the needle body. The slider has a tongue on the distal end side that abuts against the tip of the hook at the front end to close the hook during the forming operation of the stitch that forms a new loop on the hook. The tongue also has the function of guiding and knocking over the old loop held by the upper edge of the tongue over the upper edge of the closed hook. Prior to closing the hook with the tongue, the old loop locked to the hook retracts relative to the hook and advances to the upper edge of the tongue upon advancement to the hook mouth. When the knitting yarn is supplied to the hook at the mouth, when the hook is pulled into the needle bed, the knitting yarn is captured in the hook and a new loop is formed in the hook. When the front end of the tongue is brought into contact with the tip of the hook to close the hook and the needle body and the slider are further drawn into the needle bed, the old loop is knocked over. In order to smoothly perform such a tongue action, the bottom surface of the slider groove may be formed as a cam surface including an ascending slope and a descending slope that move the tongue up and down (see, for example, Patent Document 1).

Japanese Patent No. 3886903

  When the hook is advanced to the tooth opening and receives the yarn, the needle body is moved forward and backward with respect to the tooth opening while substantially stopping the slider while holding the old loop at the upper edge of the tongue. When the needle body supplied with the hook retracts from the mouth and approaches the tongue so as to close the hook, the tongue tends to rise relatively by the action of the rising slope of the slider groove, and the old loop has teeth. Pulled down the mouth. At the bottom part of the tongue, the part that slides against the rising slope of the slider groove has a component force in the direction to make contact with the rising slope perpendicular to the rising slope due to the influence of the downward tension on the old loop of the upper edge. A component force is generated in the direction of descending along. When the relative rise of the tongue is temporarily held, if the component force in the downward direction increases, the slider may move backward with respect to the needle body.

  The component force in the direction in which the slider is lowered while the tongue is relatively raised increases when the old loop has double stitches, when using thick knitting yarn, when increasing the needle body and slider drive speed, etc. To do.

  The object of the present invention is to move the slider backward by the pulling force downward to the old loop even if the tongue is temporarily kept in a relatively rising state when the hook is relatively moved to close. To provide a compound needle of a flat knitting machine that can be made difficult.

The present invention is a needle groove that is accommodated in a needle groove formed on a needle bed of a flat knitting machine so as to be slidable back and forth, has a hook at the front, and has a slider groove formed behind the hook. The body,
The lower part is accommodated in the slider groove of the needle body, the front part has a tongue that can lock the stitch, and is combined with a slider that moves relative to the needle body and opens and closes the hook with the tongue.
On the bottom of the slider groove, when the slider is approached to close the hook with the tongue, the rising slope is fixed so that the tip of the tongue reaches a height at which the tip of the tongue contacts the tip of the hook, and the raised tongue is constant In the compound needle of the flat knitting machine in which the flat surface approaching the hook at a height of is formed as a continuous cam surface,
The bottom of the slider, where the bottom of the slider groove acts as the cam surface,
When closing the hook with the tongue, a sliding contact portion that slides on the flat surface of the bottom surface of the slider groove so that the tongue approaches at a constant height;
When the sliding contact portion transitions from the rising slope of the bottom surface of the slider groove to the flat surface, it protrudes from the front of the sliding contact portion toward the bottom surface side of the slider groove so as to contact the flat surface before the sliding contact portion. A contact portion to be
It is the compound needle of the flat knitting machine characterized by having.

Further, in the present invention, the contact portion of the bottom portion of the slider has an arc shape and makes point contact with the flat surface.
It is characterized by that.

Further, in the present invention, the tongue is divided into two blades, and when closing the hook, the hook point is sandwiched from both sides.
It is characterized by

  According to the present invention, the bottom portion of the slider in which the bottom surface of the slider groove acts as a cam surface has the sliding contact portion and the contact portion. When the hook is closed with the tongue, the sliding contact portion is in sliding contact with the flat surface of the bottom surface of the blade groove so that the tongue approaches the hook at a certain height. The abutting portion is located at the stage where the sliding contact portion transitions from the rising slope of the bottom surface of the blade groove to the flat surface, and precedes the sliding contact portion so as to contact the flat surface from the front of the sliding contact portion. Projects to the bottom side. Since the abutting part abuts against the flat surface of the bottom surface of the slider groove before the sliding contact part, the component force is in the direction along the flat surface, even if a tensile force is applied downward to the old loop to the old loop. Occurs in a direction perpendicular to the flat surface. If the abutment part is in contact with the flat surface during the thread evacuation in which the state of the relative rise of the tongue is temporarily held, instead of the component force generated in the direction of retreating along the rising slope, Since the component force is generated in the direction along the flat surface, it is difficult to move the slider backward.

  Further, according to the present invention, since the contact portion of the bottom portion of the slider has a circular arc shape and makes point contact, when contacting the flat surface of the bottom surface of the slider groove, only the component force in the direction perpendicular to the flat portion is obtained. Can be prevented so that a component force in the direction of retracting the slider along the flat surface is not generated.

  In addition, according to the present invention, the two blades of the slider can be used to smoothly open and close the hook, and even if the pulling force below the tooth loop increases with respect to the old loop, the slider becomes difficult to retreat, and a reliable knockover is achieved. Can be done.

FIG. 1 is a partial front view showing a schematic configuration of a compound needle 1 as an embodiment of the present invention. FIG. 2 is a front view showing main parts constituting the compound needle 1 of FIG. 1 and a combination state thereof. FIG. 3 is a partial front view showing the operation of the compound needle 1 of FIG. FIG. 4 is a partial front view showing a state in which the old loop is held by the compound needle 1 of FIG.

  Hereinafter, FIG. 1 partially shows a schematic configuration of a compound needle 1 used in a flat knitting machine as an embodiment of the present invention. In FIG. 2, the whole structure of the compound needle 1 of FIG. 1 and the structure of main components are shown. FIG. 3 shows the operation of the compound needle 1 of FIG. FIG. 4 shows a state in the middle of knitting the knitted fabric with the compound needle 1 of FIG.

  In each figure, corresponding parts are denoted by the same reference numerals, and redundant description may be omitted. Further, reference numerals that are not attached to the drawings to be described may be referred to and those that are added to the above-described drawings may be referred to.

  Further, the composite needle 1 in each figure is displayed in a state where it is accommodated in a needle groove formed on the needle bed of the flat knitting machine. However, the illustration of the needle groove itself is omitted. Further, as shown in FIG. 4, the needle bed of the flat knitting machine is inclined so as to become higher toward the tooth opening in front of the needle groove and to become lower as it goes away from the tooth opening. The compound needle 1 is shown in a horizontal posture. In this posture, the right side indicates the front of the mouth side, and the left side indicates the back side away from the mouth. Further, the upper direction indicates the direction of rising from the needle groove, and the lower direction indicates the direction of sinking into the needle groove.

  In the compound needle 1 shown in FIG. 1, the needle body 2 slides in the left and right directions in the drawing within the needle groove of the needle bed. A hook 3 is provided at the front end of the needle body 2, and a guide presser 2 a is formed behind the hook 3 at a distance. A needle groove 2b that is located behind the hook 3 including the guide presser 2a is provided with a slider groove 4 that opens to the upper surface. The lower portion of the slider 5 is accommodated in the slider groove 4, and the lower portion of the slider 5 slides in the slider groove 4, so that the slider 5 can move relative to the needle body 2. A tongue 6 is formed at the front end of the slider 5, and the old loop can be held by the upper edge 6a. A drop prevention portion 6b that is higher than the upper edge 6a is provided at the tip of the tongue 6 so that the old loop held by the upper edge 6a does not fall off.

  As shown in FIG. 1, the hook 3 is open in a state where the drop-off preventing portion 6 b at the tip of the tongue 6 is separated rearward from the tip 3 a of the hook 3. The hook 3 is opened and closed by the tongue 6 as the slider 5 moves relative to the needle body 2. Movement of the slider 5 relative to the needle groove is performed via the base body 7. The slider 5 and the base body 7 are coupled to the left outside the illustrated range, and the bat provided on the base body 7 is driven by a cam to drive the slider 5. The needle body 2 also drives a bat provided on the needle jack coupled to the left outside the range shown in the drawing with a cam, and moves the hook 3 forward and backward by movement with respect to the needle groove. In the mouth 8, the front and back needle beds are opposed to each other, and the center line 8 a extends in the vertical direction.

  A cam surface including an ascending slope 4a, a flat surface 4b, and a descending slope 4c is formed on the bottom surface of the slider groove 4 that houses the lower portion of the slider 5. This cam surface guides the bottom of the tongue 6 and moves the tongue 6 up and down when the tongue 6 approaches and closes the tip 3 a of the hook 3. When the tongue 6 closes the peak 3a of the hook 3, the old loop held by the upper edge 6a of the tongue 6 can be knocked over through the upper edge 3b of the hook 3. The bottom of the tongue 6 is provided with a sliding contact portion 6c and a contact portion 6d that are in sliding contact with the cam surface. The sliding contact portion 6c is in sliding contact with the cam surface on the left side of the rising slope 4a, the rising slope 4a, and the flat surface 4b. However, at the time of yarn biting when the yarn is fed from the yarn feeder 9 to the hook 3 at the tooth mouth 8, as shown in the figure, the sliding contact portion 6c stays in the vicinity of the transition from the rising slope 4a to the flat surface 4b, and the contact portion The state where 6d contacts the flat surface 4b is temporarily held.

  As shown in the upper part of the figure, the bottom of the tongue 6 has a stepped portion 6e formed between the sliding contact portion 6c and the contact portion 6d, and has a shape recessed above the conventional shape 6f. At the rear part of the tongue 6, a shoulder part 5a and a guide part 5b of the slider 5 are provided. The guide portion 5b is pressed by the guide portion presser 2a in a state where the slider 5 is most retracted with respect to the needle body 2. The shoulder 5 a defines the last retracted position of the stitch held by the upper edge 6 a of the tongue 6.

  The stitch held by the upper edge 6 a receives a downward pulling force of the mouth 8. At this time, the contact portion 6d contacts the flat surface 4b at the bottom of the tongue 6 where the bottom surface of the slider groove 4 acts as a cam surface. As will be described later with reference to FIG. 4, the tensile force on the stitch acts downward in the figure and substantially coincides with the direction in which the abutting portion 6 d abuts on the flat surface 4 c. For this reason, since the component force in the direction along the flat surface 4b is hardly generated depending on the tensile force, the slider 5 is hardly retracted. Note that, even if the shape of the contact portion 6d is a linear shape that makes a short line contact with the flat surface 4b, for example, the component force generated in the direction along the flat surface 4b can make the slider 5 difficult to retract. . If the shape of the abutting portion 6d is an arc and is in a point contact state, only the component force in the direction perpendicular to the flat surface 4b is always generated, and the component force in the direction along the flat surface 4b is not generated. Further, the slider 5 can be made difficult to move backward.

  FIG. 2 shows the compound needle 1 and its main components, the needle body 2, the slider 5, and the needle jack 10, in a combined state and a disassembled state, respectively. The slider 5 and the base body 7 are coupled by the coupling portion 5d, and the slider 5 is moved by the driving force received by the driving bat 7b. An auxiliary bat 7c is also provided adjacent to the drive bat 7b. The needle body 2 has a coupling recess 2c near the rear end. A needle jack 10 is coupled to the needle body 2. The needle jack 10 has an elastic leg 10a at the tail and elastically floats from the bottom surface of the needle groove. A drive bat 10b is provided in the middle of the needle jack 10 and receives a drive for sliding the needle body 2 in the needle groove. A coupling convex portion 10 c is provided at the front end of the needle jack 10. The coupling convex portion 10c is coupled to the coupling concave portion 2c of the needle body 2, and the needle body 2 and the needle jack 10 are combined. The combination of the base body 7 and the slider 5 can be relatively moved with respect to the needle jack 10 and the needle body 2 coupled in this way.

  FIG. 3 shows a knitting operation of the knit performed by moving the slider 5 relative to the needle body 2 in the compound needle 1 of FIG. Although the needle body 2 may move with respect to the needle groove, the operation is shown in a state where the needle body 2 is relatively stationary and the slider 5 is relatively moved.

  FIG. 3A shows a state in which the slider 5 is retracted most with respect to the needle body 2. The hook 3 is in the state of being most advanced to the tooth opening 8. The old loop that is locked in the hook 3 before the hook 3 is advanced to the tooth opening 8 moves toward the tongue 6 along the upper edge of the needle stem 2b as the needle body 2 advances to the tooth opening 8. To do. Since the drop-off preventing portion 6b of the tongue 6 sinks into the slider groove 4 and does not protrude from the upper edge of the needle stem 2b, the old loop can be smoothly moved relative to the upper edge 6a of the tongue 6.

  FIG.3 (b) shows the state at the time of the thread bite which receives a yarn feed to the hook 3 of FIG. 3A, when the slider 5 is substantially stopped with respect to the needle groove, the needle body 2 is slightly retracted relative to the needle groove, and the hook 3 is retracted from the most advanced position to the yarn feeding position, the tongue 6 The tongue 6 can be raised so that the slidable contact portion 6c at the bottom of the rim is in slidable contact with the rising slope 4a and the upper edge 6a and the drop-off preventing portion 6b are positioned higher than the upper edge of the needle stem 2b. If the contact portion 6d at the bottom of the tongue 6 is temporarily in contact with the flat surface 4b and the hook 3 is fed, the tension to the old loop held by the upper edge 6a of the tongue 6 Even if the force acts below the mouth opening 8, the slider 5 can be made difficult to move backward.

  FIG. 3C shows a state in which the slider 5 is stopped at the position shown in FIG. 3B, the needle body 2 is retracted from the tooth opening 8, and the hook 3 is pulled into the needle bed. When the sliding contact portion 6c at the bottom of the tongue 6 comes into sliding contact with the flat surface 4b, the contact portion 6d is separated from the flat surface 4b and is not affected by the cam surface. The knitting yarn is captured in the hook 3.

  FIG. 3 (d) shows a state in which the tip 3 a of the hook 3 abuts against the drop-off preventing portion 6 b at the front end of the tongue 6 and the hook 3 is closed by the tongue 6. A new loop is formed in the hook 3 by pulling the hook 3 toward the needle bed. When the hook 3 is further pulled, the old loop held by the upper edge 6 a of the tongue 6 is knocked over via the upper edge 3 b of the hook 3. In order to prevent the drop-off prevention part 6b from obstructing the movement of the old loop at the time of knockover, a descending slope 4c for lowering the tongue 6 is provided. If the movement of the old loop is not hindered, the flat surface 4b may be extended to the front end without providing the descending slope 4c on the bottom surface of the slider groove 4.

  The slider 5 is divided into two blades arranged in a direction perpendicular to the paper surface. The front end side of the tongue 6 is also divided into two pieces. When the tip 3a of the hook 3 is closed at the front end of the tongue 6 as shown in FIG. 3D, the drop-off preventing portion 6b sandwiches the tip 3a from both sides. . When the slider 5 is divided into two blades, the hook 3 is not only closed at the tip of the tongue 6 as shown in FIG. It can also be transferred. In such a drive cam for performing various operations using the slider 6 that can be divided into two blades, the path of the cam groove acting on the drive butt 7b is frequently switched. If the slider 6 is moved backward during the guidance, it may be guided along a different route and malfunction. If the contact portion 6d is provided at the bottom of the tongue 6 and the slider 6 is difficult to move backward, the possibility of malfunction can be reduced. Further, a slider 5 that cannot be divided into two blades may be used. Even in this case, at the time of temporary holding at the time of yarn knitting, it is possible to make it difficult to move backward similarly to the slider 5 that can be divided into the two blades described above.

  FIG. 4 shows a state in the vicinity of the tip of the needle bed 11 at the time of knitting yarn knitting as knitting of the knitted fabric, similarly to FIG. 1 and FIG. 3 (b). The old loop 12 held by the upper edge 6 b of the tongue 6 continues to the knitted fabric 13 that hangs down below the mouth 8. The knitted fabric 13 is pulled below the tooth opening 8 by a pulling device or the like. A movable sinker 14 that pushes the old loop 12 or the knitted fabric 13 below the tooth opening 8 may be used. The movable sinker 14 pushes the old loop 12 below the tooth opening 8 at the knitting yarn receiving portion 14a. In such a knitting yarn of the old loop 12, a downward tensile force acts on the upper edge 6 a of the tongue 6. Since the bottom of the tongue 6 is in contact with the flat surface 4b of the bottom surface of the slider groove 4 by point contact at the contact 6d having an arcuate shape, the contact 6d has almost no component force to retract the slider 5. Does not occur.

DESCRIPTION OF SYMBOLS 1 Compound needle 2 Needle main body 3 Hook 3a Point 4 Slider groove 4a Ascending slope 4b Flat surface 5 Slider 6 Tongue 6a Upper edge 6c Sliding part 6d Contact part 7 Base 8 Tooth mouth 12 Old loop

Claims (3)

A needle body formed in a needle groove formed on the needle bed of the flat knitting machine in a state of being slidable back and forth, having a hook at the front, and a slider groove formed behind the hook;
The lower part is accommodated in the slider groove of the needle body, the front part has a tongue that can lock the stitch, and is combined with a slider that moves relative to the needle body and opens and closes the hook with the tongue.
On the bottom of the slider groove, when the slider is approached to close the hook with the tongue, the rising slope is fixed so that the tip of the tongue reaches a height at which the tip of the tongue contacts the tip of the hook, and the raised tongue is constant In the compound needle of the flat knitting machine in which the flat surface approaching the hook at a height of is formed as a continuous cam surface,
The bottom of the slider, where the bottom of the slider groove acts as the cam surface,
When closing the hook with the tongue, a sliding contact portion that slides on the flat surface of the bottom surface of the slider groove so that the tongue approaches at a constant height;
When the sliding contact portion transitions from the rising slope of the bottom surface of the slider groove to the flat surface, it protrudes from the front of the sliding contact portion toward the bottom surface side of the slider groove so as to contact the flat surface before the sliding contact portion. A contact portion to be
A compound needle for a flat knitting machine, characterized by comprising: The contact portion of the bottom portion of the slider has an arc shape and makes point contact with the flat surface.
The compound needle of the flat knitting machine according to claim 1. The tongue is divided into two blades, and when the hook is closed, the tip of the hook is sandwiched from both sides.
The compound needle of the flat knitting machine according to claim 1 or 2, characterized in that.

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