JPH11241257A - Yarn cutter for circular knitting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter capable of stably cutting knitting yarns, even when the cutting blade of the yarn cutting means is worn. SOLUTION: This cutter is provided with a dial cap 10, bracket 24 attached to the dial cap 10, and adjusting knob 32 whose screw section 45 is screwed into a hole 31 in the bracket 24 and brim 36, at the lower end of the screw section 45, fit to a yarn cutting means 37 at the end of its base. This constitution holds the yarn cutting means 37 while allowing it to rock in the vertical direction. An adjusting screw 35 is passed through a hole 25 in the bracket 24, and a circular section 30 at its lower end is inserted into a hole 40 in the yarn cutting means 37. The adjusting screw 35 is driven downwards by a spring 26 in such a way to keep only a cutting blade section 39 at the front end of the yarn cutting means 37 in contact with a circular cutter 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn cutting device for a circular knitting machine such as a sock knitting machine, and more particularly to a yarn cutting device for a circular knitting machine for cutting a yarn with a circular cutter and a yarn cutting means.

[0002]

2. Description of the Related Art Generally, in a circular knitting machine such as a sock knitting machine, a cutting device for cutting a switching thread called a dial cap and a suction block for grasping a knitting thread are provided on an upper portion of a cylinder. What is known is.

[0003] The above-mentioned yarn cutting device is usually composed of a circular cutter that rotates in the same direction as the knitting machine, and a yarn cutting device fixed in contact with the upper surface thereof. As shown in Japanese Patent Application No. 63-61491, the front and rear ends are in contact with the circular cutter.

FIG. 6 shows a conventional yarn cutting apparatus of this type. In the figure, reference numeral 1 denotes a circular cutter having a saw blade 2 at the peripheral edge thereof. Usually, it is driven to rotate at the same rotation as the knitting. On the upper surface of the circular cutter 1, a thread cutting means 3 is fixedly arranged, and the thread cutting means 3 comes into contact with the circular cutter 1 on two surfaces of a cutting blade portion 4 at a front end and a receiving portion 5 at a rear end. ing.

In the above type of yarn cutting device, when cutting the yarn to be switched at the time of performing the yarn switching, the knitting yarn is hooked by the blade 2 on the peripheral edge of the circular cutter 1 and the fixed yarn cutting means 3 The thread is moved to the position and the thread is cut between the circular cutter 1 and the cutting blade 4 of the thread cutting means 3.

[0006]

In the conventional yarn cutting device of a knitting machine, the yarn cutting means 3 is in contact with the circular cutter 1 on two surfaces of the cutting blade portion 4 and the receiving portion 5; In the case of a handle with a large number of switching times, the cutting blade portion 4 or the receiving portion 5 of the yarn cutting means 3 is worn, and a gap is generated between the lower surface of the yarn cutting means 3 and the upper surface of the circular cutter 1, and the knitting yarn is formed. There is a problem that can not be cut. In this case, the yarn cutting means 1 must be removed and polished each time, and there is a problem that the working efficiency is reduced.

The yarn cutting means 3 and the circular cutter 1
If there is a gap between and the knitting yarn cannot be cut,
There is a risk that a large amount of knitting needles may be damaged due to the knitting yarn being wound around the knitting needles, and there is also a problem that the knitted fabric is damaged and cannot be used, or the knitting yarns are lost.

The present invention has been made in view of such a situation, and does not generate a gap between the cutting blade portion of the yarn cutting means and the circular cutter even when used for a long period of time, so that the knitting yarn is always stably cut. It is an object of the present invention to provide a yarn cutting device for a circular knitting machine that can perform the cutting.

Another object of the present invention is to provide a yarn cutting device for a circular knitting machine which can always cut satisfactorily according to the yarn quality of the knitting yarn used.

[0010]

In order to achieve the above object, the present invention is directed to a circular cutter having a saw-toothed blade at a peripheral edge thereof, and a state in which at least a cutting blade at the tip is in contact with the upper surface of the circular cutter. Thread cutting means fixed with
In a yarn cutting device for a circular knitting machine having a holding mechanism for holding a yarn cutting means, a support mechanism for supporting the yarn cutting means so that the tip side can swing up and down within a predetermined range.
Pressing means for urging the yarn cutting means toward the circular cutter side and bringing only the cutting blade portion into contact with the circular cutter, whereby the yarn cutting means makes contact only with the cutting blade portion with the circular cutter; As a result, the cutting blade is pressed against the circular cutter, so that even if the cutting blade wears, there is no gap between it and the circular cutter, and it is possible to stably cut the knitting yarn for a long time Becomes

According to the present invention, the support mechanism is provided with a function of adjusting the contact angle of the cutting blade with the circular cutter, whereby the contact angle of the cutting blade with the circular cutter is reduced, for example. An obtuse angle is used for the yarn quality, and an acute angle is used for the soft yarn quality, so that the knitting yarn can always be cut well.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a yarn cutting device of a circular knitting machine according to an embodiment of the present invention,
Reference numeral 10 in the figure indicates a dial cap. On the upper surface of the dial cap 10, a yarn cutting device 11, a block 12 for sucking a knitting yarn, and a transfer jack 13
The cams for causing the action are provided.
The dial cap 10 is arranged on the upper part of the cylinder.

As shown in FIG. 2, a circular cutter 15 driven in the same rotational direction as the knitting machine is provided between the dial cap 10 and the upper plate 14 in the same direction as the cylinder while being guided by a cam 16. Arranged with wick, dial cap 1
At the center of 0, a vertical shaft 17 is inserted and arranged.
A hub 18 is fixed to the lower end of the shaft 17 with a screw 19. The hub 18 is connected to the upper plate 14 by a squeezing pin 20. The upper plate 14 is usually provided with a groove in a radial direction, and the transfer jack 13 is inserted into this groove. Further, the upper plate 14 and the circular cutter 15 are engaged with each other by a convex portion and a concave portion (not shown). Thus, the shaft 17 and the upper plate 14 rotate by the same rotation.

On the inner peripheral side of the circular cutter 15, FIG.
As shown in FIG. 3, the cam 16 is fixed to the dial cap 10 and the circular cutter 15 is provided.
Are rotatable using the cam 16 as a guide. Further, as shown in FIG. 1, the dial cap 10 is fixed to a support 21 via a fixing screw 22, and is fixed to the knitting machine without rotating.

The thread cutting device 11 is mounted on the upper surface of the dial cap 10 by fixing a bracket 24 via a mounting screw 23, as shown in FIGS. The bracket 24 has three holes or screw holes. One of the holes 25 is formed by performing two-step drilling from the lower surface side of the bracket 24, and a spring 26 is inserted into the larger hole from the lower surface side of the bracket 24 to form a step with the small hole. It stops at the department. An adjusting screw 35 penetrates through the hole 25 from the lower surface side of the bracket 24, and a spring 26 abuts a flange portion 27 of the bracket 25. A portion of the adjusting screw 35 projecting upward from the hole 25 is provided with a nut. 28 and 29 are screwed.

As shown in FIGS. 4 and 5, a round portion 30 is integrally provided at the lower end of the adjusting screw 35. The round portion 30 is provided with a hole 40 of a thread cutting means 37 to be described later.
It is inserted in.

As shown in FIG. 4, a screw portion 45 of the adjustment knob 32 is screwed into the screw hole 31 provided in the bracket 24 from the upper surface side of the bracket 24. The plate 33 is fixed to the bracket 24 by a set screw 34.

As shown in FIG. 4, the adjusting knob 32 integrally has a flange 36 at the lower end of the screw portion 34.
6 engages with a concave portion 38 at the base end of the thread cutting means 37, and supports the thread cutting means 37 so as to be able to swing up and down. Thus, only the cutting blade 39 at the tip of the yarn cutting means 37 comes into contact with the circular cutter 15.

As shown in FIGS. 4 and 5, a hole 40 is provided in the upper surface on the distal end side of the thread cutting means 37, and the round portion 30 is inserted into the hole 40. 4 and 5, a hole 41 is formed at the center in the front-rear direction of the thread cutting means 37. One end of a gourd-shaped wire 42 is inserted into the hole 41 through a rivet 43. Fixed. The other end of the wire 42 is engaged with the thin shaft portion between the round portion 30 and the flange portion 27 in a state where the wire 42 is prevented from falling off at the round portion 30. The wire 42 prevents the round portion 30 from coming out of the hole 40.

In FIGS. 3 to 5, reference numeral 44 denotes
Is a saw-shaped blade provided on the peripheral edge of the circular cutter 15.

Next, the operation of the present embodiment will be described. The thread cutting device 11 disposed on the upper surface of the dial cap 10 has the cutting blade 39 of the thread cutting means 37 aligned with the outer edge of the circular cutter 15.

In this state, when the switching yarn path escapes (lifts upward) between the known knitting yarn and the switching yarn path, the cylinder rotates and the knitting needle moves together, whereby the knitting yarn also moves. . Before the yarn comes to the position of the yarn cutting means 37,
It enters the blade portion 44 of the circular cutter 15 and moves to the position of the thread cutting means 37 by the rotation of the circular cutter 15. Then, it is cut between the circular cutter 15 and the cutting blade 39 of the yarn cutting means 37.

Since the cutting blade 39 of the thread cutting means 37 is in contact with the upper surface of the circular cutter 15, the lower surface of the cutting blade 39 indicated by reference numeral 46 in FIG. However, even if the lower surface 46 of the cutting blade portion 39 is worn down by the spring 26, the yarn cutting device 37 is always pressed and urged downward by the spring 26, but the yarn cutting device 37 has only a gap 47 shown in FIG. Since it can be swung downward, the lower surface 46 of the cutting blade portion 39 is maintained until the gap 47 becomes zero.
Can be brought into contact with the upper surface of the circular cutter 15. For this reason, the knitting yarn can be stably cut over a long period of time.

If the cutting state of the knitting yarn becomes worse after a long period of use, the adjusting knob 32 is rotated by hand to move the adjusting knob 32 upward. As a result, the base end side of the thread cutting means 37 is raised, and the cutting blade 39 of the thread cutting means 37 is
An angle occurs at which the thread comes into contact with the circular cutter 15, and the sharpness of the knitting yarn can be restored.

The angle adjustment of the yarn cutting means 37 is also required when the yarn quality changes due to a change in the yarn type of the knitting yarn, or when the hardness of the knitting yarn changes. For example, in the case of hard yarn quality, the contact angle is set to an obtuse angle, while in the case of soft yarn quality, it is better that the contact angle is set to an acute angle. Has been confirmed.

In such a case, first, the nuts 28 and 29 of the adjusting screw 35 are loosened to form a gap 47, and then the adjusting knob 32 is manually turned to adjust the contact angle. After the adjustment is completed, the plate screw 33 is pushed in by operating the set screw 34. This allows adjustment knob 3
The second screw portion 45 is tightened, and the adjustment knob 32 is locked.

If the cutting state of the knitting yarn becomes worse, the sharpness of the knitting yarn can be returned to the original state only by operating the adjusting knob 32 by hand.
7, the number of times of re-polishing can be greatly reduced.

The present invention is not limited to the above-described embodiment. The yarn cutting means 37 can swing up and down, only the cutting blade 39 at the tip comes into contact with the circular cutter 15, and the yarn cutting means 37 Any structure may be used as long as the structure 37 is biased toward the circular cutter 15. Further, the cutting blade 39 can be fixed and the mounting bracket can be moved.

[0029]

As described above, according to the present invention, the holding mechanism of the yarn cutting means is constituted by the support mechanism and the pressing means, and only the cutting blade at the tip of the yarn cutting means comes into contact with the circular cutter. Therefore, even if the cutting blade is worn, no gap is formed between the cutting blade and the circular cutter, and the knitting yarn can be stably cut for a long period of time.

According to the present invention, since the support mechanism has a function of adjusting the contact angle of the cutting blade with the circular cutter, the contact angle is reduced to, for example, an obtuse angle in the case of hard yarn, and In the case of soft yarn quality, the acute angle makes it possible to always cut the knitting yarn well.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a thread cutting device of a circular knitting machine according to an embodiment of the present invention as viewed from above a dial cap.

FIG. 2 is a partial sectional view of the device of FIG. 1 as viewed from a side of a dial cap.

FIG. 3 is an enlarged view of a main part of FIG. 1;

FIG. 4 is an enlarged view of a main part of FIG. 2;

FIG. 5 is an enlarged view of a main part of FIG. 4;

FIG. 6 is a configuration diagram showing a conventional thread cutting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Dial cap 11 Thread cutting device 12 Block 24 Bracket 25,41 hole 26 Spring 27,36 Flange 28,29 Nut 30 Round part 31 Screw part 32 Adjustment knob 33 Plate 34 Set screw 35 Adjustment screw 37 Thread cutting means 38 Recess 39 Cutting blade part 40 hole 42 Wire 44 Blade part 45 Screw part 46 Lower surface 47 Gap

Claims (3)

[Claims] 1. A circular cutter having a saw-shaped blade at a peripheral edge thereof, a thread cutting means fixed in a state in which at least a cutting blade at the tip of the circular cutter is in contact with an upper surface of the circular cutter, and the thread cutting means. In a yarn cutting device for a circular knitting machine having a holding mechanism for holding, the holding mechanism includes a support mechanism for supporting the yarn cutting means such that the tip side can swing up and down within a predetermined range, and a yarn cutter on the circular cutter side. And a pressing means for urging the cutting blade to contact only the cutting blade with the circular cutter. 2. The yarn cutting device for a circular knitting machine according to claim 1, wherein the support mechanism has a function of adjusting a contact angle of the cutting blade with the circular cutter. 3. The yarn cutting device for a circular knitting machine according to claim 1, wherein the adjustable function is a pin.