JPH0331818B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scissor-type weft cutting device for a loom.

[Conventional technology]

Conventionally, there has been a scissor-type weft cutting device for a loom as shown in, for example, Japanese Utility Model Application Publication No. 116783/1983. As shown in FIG. 10, this weft cutting device presses opposing sides of a fixed blade 1 and a movable blade 2 that is swung by a swiveling shaft 3, so that the movable blade 2 moves in the direction of the position of the fixed blade 1. The terminal of the weft yarn that has come flying is caught between the movable blade 2 and the fixed blade 1, and the weft yarn is cut by a push-cut operation in which both blades close.

[Problem that the invention seeks to solve]

In the conventional scissor-type weft cutting device mentioned above, the movable blade moves in a plane in the direction of the position of the fixed blade, pinches the end of the flying weft, and both the movable and fixed blades close together to force cut the weft. Because of this, the position of the cutting edge that cuts the weft is always the same, which causes the problem that the cutting edge wears out and quickly loses its sharpness. Further, in the conventional weft thread cutting device, when the movable blade moves in the direction of the fixed blade, the weft thread tends to escape because of the initial push.

The present invention solves the above-mentioned problems, and provides a scissors type that is less likely to lose sharpness due to abrasion of the cutting edge, is less likely to cause the weft to escape when the movable blade moves in the direction of the fixed blade, and can operate at high speed. The purpose of the present invention is to provide a weft thread cutting device.

[Means for solving problems]

The present invention provides a scissor-type weft cutting device in which opposing sides of a fixed blade and a movable blade are pressed against each other, and the upper edge of the fixed blade is provided with a cutting edge that is horizontal or slightly inclined downward relative to the horizontal. , a cutting edge is formed on the lower edge of the movable blade, the movable blade is attached to a swinging shaft that rotates forward and backward within a certain range so that it can be opened and closed using this shaft as a fulcrum, and the center of the swinging shaft and the center of the movable blade are connected to each other. The tip of the cutting edge and the tip of the cutting edge are arranged in a positional relationship such that the distance from the center of the swing axis to the tip of the cutting edge of the movable blade is longer than the distance from the center of the swing axis to the tip of the cutting edge of the movable blade. In addition, the swing shaft is disposed at a position above the distal end side of the two cutting edges relative to the intersection point where the cutting edge of the fixed blade and the cutting edge of the movable blade intersect at an acute angle when the movable blade is fully opened.

[Effect]

As illustrated in FIG. 2, the weft cutting device according to the present invention is characterized in that when the movable blade is opened, the weft yarn flies into the space formed between the tip end side of the intersection of the cutting edge of the movable blade and the cutting edge of the fixed blade. By arranging the movable blade and the fixed blade at a position where the weft enters, in the open state of the movable blade with the weft inserted in the space, the movable blade is rotated in the forward direction along with this axis using the swing axis as a fulcrum, and the movable blade is causing the blade to perform a compound movement of a downward closing movement and a movement across the weft longitudinal direction toward the end of the fixed blade's blade, which is the opposite direction to the open tip of the blade;
The end of the weft thread is pulled while being drawn in with the cutting edge of the movable blade toward the lower end of the cutting edge of the fixed blade. For this reason, the weft is made difficult to escape, the cutting edge is not easily worn out, and the sharpness is not lost prematurely.

That is, in the present invention, the distance from the center of the swing axis to the end of the cutting edge of the movable blade is the distance from the center of the swing axis to the end of the cutting edge of the movable blade. The movable blade is moved like a clock pendulum and slides flat against the fixed blade, and the incoming weft is caught by the movable blade. It is pulled toward the left in FIG. 2 and cut as it is pulled in.

Generally, it is reasonable to cut while pulling the knife toward your hand. In a weft cutting device equipped with a pendulum-type movable blade according to the present invention based on this principle, the tip end side of the movable blade, which pulls in and cuts the weft yarn, is farther from the center of the swing axis than the end side of the blade tip. Because the blade is long, even if the movable blade, which is open at the tip end, has a small momentum to close, the movement width of the movable blade, that is, the width of engagement with the fixed blade, is large, and for this reason, weft escape can be sufficiently eliminated, and the weft The cutting is not performed at a substantially fixed point on the cutting edge, but rather within a certain length range between the tip of the cutting edge and the intersection point when the cutting edge is opened. This not only ensures reliable weft cutting, but also improves the life of the cutting edge. In other words, according to the present invention, the problem of the conventional scissor-type weft thread cutting device, which could not be solved by the action of simply pinching and cutting the weft thread, can be solved by using a movable blade that cuts the weft thread downward and to the left in Figure 2. Let them exercise;
It is possible to cut while pulling the cutting edge, to cut while pulling the weft, and to cut within a certain length of the cutting edge, reducing wear on the cutting edge. and,
The oscillating shaft rotates forward and backward, and the movable shaft also oscillates together with it. After cutting the weft as described above, the oscillating shaft rotates in the opposite direction, and the movable blade moves upward to open and the cutting edge of the fixed blade. It performs a compound movement with movement toward the tip side, and the rotation angle of the swing axis and movable blade is within a small range of less than 90°, allowing high-speed operation and mechanical It becomes a cutting device.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a fixed blade, and the fixed blade 1 is fixed to the upper end of the lower spring plate 4 with screws, and the lower end of the lower spring plate 4 is fixed to the support base 6 with screws. There is. 2 is a movable blade;
is fixed to the lower end of the upper spring plate 7 with screws, and the upper end of the upper spring plate 7 is fixed to one end of the swing shaft 3 with screws. The swing shaft 3 is pivotally supported by a support base 6 via a bearing 8, and is biased toward the side opposite to the movable blade 2 by a coil spring 9 and a C ring 10. 3a
is a step formed on the upper part of the swing shaft 3, and by using this step 3a to screw the upper spring plate 7 below the step 3a, the lever action can be used to
Even if the number of screws for fixing the upper spring plate 7 is small, such as one, it is possible to securely fix the upper spring plate 7. At the same time, by forming the step portion 3a, it is possible to prevent vibration due to rocking.

The cutting edge 1a formed on the upper edge of the fixed blade 1 is inclined so that the tip is downward in the range of 0° to 5° with respect to the horizontal plane, and the swing shaft 3 is connected to the cutting edge 1a of the fixed blade 1 and the movable blade 2. When the fixed blade 1 is opened, a blade 2a is formed on the lower edge which is inclined so that the tip is downward when the blade is opened, and the blade edge 2a is formed at the upper position on the distal end side of the fixed blade 1 in a horizontal direction, that is, in a horizontal direction orthogonal to the front-rear Y direction. arranged along the
The center 3o of the swing shaft 3, the tip _2a1 of the cutting edge 2a1, and the end _2a2 of the cutting edge of the movable blade 2 are such that the distance from the center 3o to the tip _2a1 is equal to the distance from the center 3o to the tip 2a2.
They are arranged in a positional relationship that forms a scalene triangle that is longer than the distance to a ₂ . Furthermore, the cutting edge 1a of the fixed blade 1 and the cutting edge 2a of the movable blade 2 when the movable blade 2 is fully opened.
The angle between the intersection point 5 and the tip side of the intersection point 5 is an acute angle,
It is configured such that a space 12 into which the weft 11 enters is formed. Further, the opposing sides of the fixed blade 1 and the movable blade 2 are connected to the coil spring 9 and the lower and upper spring plates 4,
7 and are pressed together by the spring force.

The support stand 6 is fixed to a fixed member 14, which constitutes a part of the loom, by an angle-shaped mounting member 13 so as to be adjustable in position in the up-down X and front-back Y directions.
Furthermore, an arm A15 extending downward is fixed to the end of the swing shaft 3 opposite to the movable blade 2.
A joint 16 removably engaged with the intermediate shaft 1
Arm B2 is attached to and reversibly fixed to 7.
4 is removably engaged. The intermediate shaft 17 is supported on the support base 6 in parallel with the swing shaft 3, and is biased in the opposite direction to the fixed blade 1 by a coil spring 18 and a C ring 19. The upper end of a cam lever 20 is fitted and fixed to the intermediate shaft 17, and a cam follower 21 pivotally connected to the lower end of the cam lever 20 is engaged with a cam 23 that is fitted and fixed to the thread sword shaft 22. The cam lever 20 is pressed against the protrusion 23a of the cam 23 by a spring (not shown).

In the weft cutting device of the embodiment configured as described above, the cam follower 21, cam lever 20,
Intermediate shaft 17, arm B24, joint 16, arm A
15 to swing the swing shaft 3. Due to the swinging of the swing shaft 3, the movable blade 2 opens and closes in the up and down (X) direction via the upper spring plate 7, and also moves back and forth (Y).
The movable blade 1 swings in a pendulum manner with a predetermined amplitude in the direction, and moves from the intersection point 5 when the fixed blade 1 is fully opened, as shown by the solid line in FIG. The flying weft 11 enters, and the swing axis 3
By the forward rotation of the movable blade 2 with the swing axis 3 as the intersection point, the movable blade 2 is perpendicular to the flying position direction of the weft 11 and closed relative to the fixed blade 1 as shown by the chain line in FIG. , the weft yarn 11 can be reliably cut while being pulled toward the lower left side in FIG. 2 without letting it escape. After cutting the weft yarn 11, the movable blade 2 rotates in the opening direction due to the reverse rotation of the swing shaft 3 due to the rotation of the cam 23 in the opposite direction, and returns to the fully open position.

In the embodiment described above, the weft 11 is in the space 12.
The movable blade 2 starts swinging as soon as the blade enters, but as shown in FIGS. 6 and 7, when the arm A15 is replaced with a shorter arm C25 and the arm B24 is reversed, the flying weft 11 is After entering the space 12, the movable blade 2 begins to swing after a slight delay, and a post-cutting weft cutting device is obtained.

Further, in the embodiment, the cutting edge 1 of the fixed blade 1
The reason for providing a slight inclination in a such that the tip side of the cutting edge 1a is lowered with respect to the horizontal is to make it easier for the weft 11 to enter the space 12, but it is not necessary to provide the above-mentioned inclination.

8 and 9 show other embodiments of the present invention,
In this embodiment, a substantially L-shaped mounting member 2 is attached to the support base 6.
6 is fixed, and the lower spring plate 4, which is disposed in front of the upper spring plate 7, is supported by the mounting member 26 so as to be movable in the front and rear direction by the retaining screw 27, and between the lower spring plate 4 and the mounting member 26, By interposing the spring 28, a space is provided between the lower spring plate 4, the fixed blade 1 fixed thereto, and the support base 6, so that the fixed blade 1 goes under the woven fabric, and there is almost no yarn left when cutting the weft. This is how it was done. The configuration of this embodiment other than those described above is the same as the embodiment shown in FIGS. 1 to 5, and the same reference numerals as in FIGS. 1 to 5 in FIGS. 8 and 9 correspond. shows the part.

〔Effect of the invention〕

As explained above, according to the present invention, in a scissor-type weft cutting device in which the opposing sides of a fixed blade and a movable blade are brought into contact with each other, the upper edge of the fixed blade is horizontal to the upper edge of the fixed blade, or the tip thereof is slightly downward to the horizontal. A cutting edge is formed at the lower edge of the movable blade, and the movable blade is attached to a swinging shaft that rotates forward and backward within a certain range so as to be openable and closable with this shaft as a fulcrum. The center of the shaft and the tip and tip of the movable blade of the movable blade are connected to form a triangle in which the distance from the center of the swing axis to the tip of the movable blade is longer than the distance from the center of the swing shaft to the tip of the movable blade. The movable blade is arranged in a positional relationship to form a positional relationship, and the swing axis is arranged at a position above the distal side of the two cutting edges relative to the intersection point where the cutting edge of the fixed blade and the cutting edge of the movable blade intersect at an acute angle when the movable blade is fully opened. Therefore, the following effects can be obtained.

That is, the weft cutting device according to the present invention has a second
As illustrated in the figure, the movable blade and the fixed blade are positioned so that when the movable blade is opened, the flying weft enters the space formed between the intersection of the cutting edge of the movable blade and the cutting edge of the fixed blade and the tip side. By placing
In the open state of the movable blade with the weft in the space,
The movable blade is rotated in the forward direction with the swing axis as a fulcrum, and the movable blade is moved downward in the closing direction, and in the longitudinal direction of the weft toward the end of the fixed blade's blade, which is the opposite direction from the open tip of the blade. A compound movement with the intersecting movement is performed, and the end of the weft is pulled with the cutting edge of the movable blade toward the lower side of the distal end of the cutting edge of the fixed blade. Therefore, the weft can be reliably cut without letting it escape, and the weft can be cut within a certain length range of the cutting edge, thereby extending the life of the cutting edge of the fixed blade and the movable blade. and,
The swing shaft rotates forward and backward, and the movable shaft swings together with it. After cutting the weft as described above, the swing shaft rotates in the reverse direction, and the movable blade moves upward to open and the movable blade rotates. This machine performs compound motion with movement toward the tip of the blade, and the rotation angle of the swing axis and movable blade is within a small range of less than 90°, so it can operate at high speeds and is compatible with high-speed looms. It becomes a target cutting device.

[Brief explanation of drawings]

Fig. 1 is a partially sectional front view of a weft cutting device according to an embodiment of the present invention, Fig. 2 is a front view of the same main part when the movable blade is fully open, and Fig. 3 is a partially exploded perspective view. , Figure 4 is a front view showing the main parts and drive device, Figure 5
6 is a front view showing a modification of the main part and the drive device, FIG. 7 is a side view of the same, and FIG. 8 is a front view showing the main part of another embodiment of the present invention. FIG. 9 is a side view of the same, and FIG. 10 is a side view showing a conventional weft cutting device. 1...Fixed blade, 1a...Blade tip, 2...Movable blade, 2a...
Cutting edge, 2a ₁ , 2a ₂ ... tip of the cutting edge, end of the cutting edge, 3... swinging shaft, 3a... step part of the swinging shaft, 3o... center of the swinging shaft, 4... lower spring plate, 5... intersection, 6... support Stand, 7...
Upper spring plate, 8...Bearing, 9...Coil spring, 10...C
Ring, 11...Weft, 12...Space, 13...Mounting member, 14...Fixing member, 15...Arm A, 16...
Joint, 17... Intermediate shaft, 18... Coil spring, 19...
C ring, 20...Cam lever, 21...Cam follower, 22...Thread sword shaft, 23...Cam, 23a...
Projection, 24...Arm B, 25...Arm C, 26
...Mounting member, 27... Retaining screw, 28... Spring.

Claims (1)

[Claims] 1. In a scissor-type weft cutting device in which opposing sides of a fixed blade and a movable blade are brought into pressure contact, a cutting edge is formed on the upper edge of the fixed blade, which is horizontal or slightly inclined downward with respect to the horizontal, and A cutting edge is formed on the lower edge of the blade, and the movable blade is attached to a swinging shaft that rotates forward and backward within a certain range so that it can be opened and closed using this shaft as a fulcrum. The end of the cutting edge is arranged in a positional relationship such that the distance from the center of the swing axis to the tip of the cutting edge of the movable blade is longer than the distance from the center of the swing axis to the tip of the cutting edge of the movable blade, and the swinging A weft cutting device for a loom, characterized in that the shaft is disposed at a position above the distal end side of both blade edges, rather than the intersection point where the blade edge of the fixed blade and the blade edge of the movable blade intersect at an acute angle when the movable blade is fully opened.