JP2009174074A - Weft-cutting apparatus for loom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely cross mutual blade tips at a desired angle in the thickness direction over a rotating range of a movable cutter blade, and to more surely suppress weft miss cut and wear of the blade tips, in a weft-cutting apparatus for a loom. <P>SOLUTION: The weft-cutting apparatus for the loom is equipped with a fixed cutter blade 1, a movable cutter blade 2 which is rotatable, and an biasing member 5 for bringing the fixed cutter blade and the movable cutter blade into contact with each other. The fixed cutter blade and the movable cutter blade are formed of cutting parts 12 and 22, and base parts 13 and 23 which continue from the cutting parts and include the center of rotation, respectively. At least one base part of the fixed cutter blade and the movable cutter blade is equipped with a protruding part 16, in a region which is on the opposite side to the side of the cutting parts to the center of rotation and which is normally opposite to the other side during rotation of the movable cutter blade 2, protruding toward the other side. The fixed cutter blade and the movable cutter blade are brought into contact with each other by the biasing member only in two sites of the protruding part and each blade tip of the cutting parts. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus for cutting a weft thread inserted during operation of a loom.

A known weft cutting device for a loom includes a fixed blade body fixed to a loom frame, a movable blade body that can be rotated, and a pin that serves as a rotation center, and a compression spring that passes through the outer peripheral surface of the pin. There is one in which the blade edge of the movable blade body is brought into contact with the blade edge of the fixed blade body (Patent Document 1).
JP 2000-328398 A

  Although not described in the above document, in order to reliably cut the weft, the blade edges of the fixed blade body and the movable blade body are slightly moved in the thickness direction, that is, in the axial direction of the rotation axis of the movable blade body. Due to the crossing structure, it is necessary to prevent the wefts from escaping between the blades so that the blade edges come into contact with each other on the rotating surface over the rotation range of the movable blade body. is there. In order to cross the blade edges in the thickness direction, at least one of the fixed blade body and the movable blade body is bent in the longitudinal direction of the blade edge in the thickness direction and formed in a shape that is recessed with respect to the other.

  This one bend is slightly bent in the longitudinal direction of the blade edge so as to have a predetermined radius of curvature, or slightly bent in the longitudinal direction of the blade edge at a predetermined angle, and resists elastic force. Therefore, it is extremely difficult to manufacture one of them with high bending accuracy. For example, if the bending condition is too large, the crossing angle in the thickness direction between the cutting edges will increase, the frictional resistance between the cutting edges will increase, the force required for cutting will increase, the cutting edge will wear, and the blade will be replaced early. Cost. On the other hand, if the degree of bending is too small, the crossing angle of the cutting edges in the thickness direction becomes small, the wefts escape, and a weft cut error occurs.

  The present invention has been made in consideration of the above-mentioned circumstances, and the problem to be solved is that the cutting edges can be reliably crossed at a desired angle in the thickness direction over the rotation range of the movable blade body, and the weft cutting is possible. It is an object of the present invention to provide a weft cutting device for a loom that can more reliably suppress mistakes and wear of the blade edge.

  The present invention includes a fixed blade body, a rotatable movable blade body, and an urging member that abuts the fixed blade body and the movable blade body, the fixed blade body and the movable blade body include a blade portion, It is assumed that the weft cutting device of a loom is formed by a base portion that is continuous with the blade portion and includes a rotation center.

  According to the first aspect of the present invention, at least one base portion of the fixed blade body and the movable blade body is a region opposite to the blade portion side with respect to the rotation center, and during the rotation of the movable blade body. A protrusion that protrudes toward the other side is provided in a region that always faces the other, and the fixed blade body and the movable blade body are brought into contact with each other only at two locations of the protrusion portion and the blade edge of the blade portion by the urging member. It is characterized by that.

  The protrusion may be present only in a very small region of the region facing the other at all times in the rotational direction of the movable blade body, but allows the movable blade body to move stably and cuts the weft. In order to suppress mistakes and the like more reliably, as in the invention of claim 2, the protrusion extends over ½ or more of the region that always faces the other in the rotational direction of the movable blade body. It is desirable to do.

  The protruding portion may be a part of the same member as the base portion, but considering the ease of manufacturing, the protruding portion has a member different from the base portion at the base portion as in the invention of claim 3. It is desirable to be formed by being fixed.

  Further, the another member may be fixed to the base part so as not to be detachable by, for example, brazing or adhesion, but if considering the ease of manufacture, the ease of replacement accompanying wear, etc. As in the invention of No. 4, it is preferable that the another member is detachably fixed to the base via a screw member.

  According to the first aspect of the present invention, there is a protrusion that protrudes toward the other side in a region that is opposite to the blade portion side with respect to the rotation center and that always faces the other during rotation of the movable blade body. Since it is provided, there are only two places where the fixed blade body and the movable blade body come into contact with each other by the urging member, that is, the protrusion portion and the blade edge of the blade portion. Therefore, if it is manufactured while paying attention to the protruding amount of the protrusion (the length protruding toward the other), it becomes possible to cross the blade edges of the fixed blade body and the movable blade body at a desired angle in the thickness direction, Weft cut errors and blade edge wear can be reliably suppressed. And since it is deformed against the elastic force and processed in anticipation of the return by the elastic force after processing, it is easier to manufacture one than the conventional case where it is extremely difficult to manufacture one with high bending accuracy. Become.

  In the invention of claim 2, since the protrusion extends over ½ or more of the region in the rotation direction of the movable blade body, smooth rotation of the movable blade body can be secured, and the cutting edges are desired. Can be reliably crossed at an angle of 5 mm, and weft cuts can be more reliably suppressed.

  In the invention of claim 3, the base portion and the protrusion portion are made as separate members, and the protrusion portion is formed on one side only by fixing to the base portion. Therefore, compared with the case where the base portion and the protrusion portion are manufactured with the same member, No cutting process or the like for forming the protrusions is required, and one of them is easy to manufacture.

  According to the invention of claim 4, since the other member is detachably fixed to the base portion by the screw member, the assembling work is facilitated, and the other member can be exchanged. In addition to being able to cope with the wear associated with, even if the desired angle in the thickness direction between the cutting edges differs depending on the weft type, it can be dealt with.

  FIG. 1 (c) is a front view of the weft cutting device with the movable blade body 2 open, and FIG. 1 (b) is a left side view of FIG. 1 (a) is a cross-sectional view of the fixed blade body 1 in FIG. 1 (b). 2 (b) is a front view of the weft cutting device in a state in which the movable blade body 2 is closed, and FIG. 2 (b) is a left side view of FIG. . FIG. 3 is an explanatory diagram showing a region where the protrusion 16 is provided.

  The weft cutting device of a loom is applied to a yarn feeding cutter that cuts the weft yarn after weft insertion, an ear cutter disposed on the non-feeding side, a middle ear cutter for forming a multi-width fabric, and the like. The weft cutting device of the loom connects and supports the movable blade body 2 so as to be rotatable with respect to the fixed blade body 1 by a pivotal support member 3 serving as a rotation center, and rotates the movable blade body 2. Means 4 is provided, and the cutting edges 11 and 21 of the fixed blade body 1 and the movable blade body 2 are made to intersect with each other at the intersecting portion on the rotation surface of the movable blade body 2 by the biasing member 5. It is attached to the frame 6.

  Each of the fixed blade body 1 and the movable blade body 2 is formed by a plate body in which the blade portions 12 and 22 and the base portions 13 and 23 are continuous, and the shaft holes 14 and 24 are formed in the respective plates. Are provided on the base portions 13 and 23 (on the blade side of the base portions 13 and 23 in the figure), respectively. The shaft hole 24 of the movable blade body 2 is formed in a taper having a larger diameter toward the outside (the anti-fixed blade body 1 side). Moreover, both the blade parts 12 and 22 are each provided with the blade edge | tips 11 and 21 along the end surface, the blade edge | tips 11 and 21 mutually cross | intersect on a rotation surface, and with the rotation of the movable blade body 2. FIG. When the intersection, that is, the intersection position advances toward the weft, the weft is cut.

  The shaft support member 3 is brazed to the pin 31 inserted into the two shaft holes 14, 24 described above, the nut 33 screwed into the male screw 32 at one end of the pin 31, and the other end of the pin 31. The movable blade body 2 is rotatably connected to the fixed blade body 1 by these. The nut 33 holds the fixed blade body 1 from the outer surface side (the side opposite to the movable blade body 2), and sandwiches the urging member 5 between the nut 33 and the nut 33. On the other hand, the taper bush 34 is a ring that holds the movable blade body 2 from the outer surface side (the side opposite to the fixed blade body 1), and the other end portion of the pin 31 is passed through the through hole 35 of the shaft center. Then, the pin 31 is brazed. Further, the taper bush 34 has an outer peripheral surface formed into a taper corresponding to the shaft hole 24 of the movable blade body 2, and is fitted along the taper surface of the shaft hole 24 of the movable blade body 2, and an outer end portion thereof is its axis. It protrudes from the hole 24. And even if the taper bush 34 or the shaft hole 24 wears with the rotation of the movable blade body 2, the taper bush 34 moves toward the fixed blade body 1 by the action of the biasing member 5. Since the state of being fitted along the taper surface of 24 is maintained, the rotation center is not shaken (not misaligned). In the present embodiment, the taper bush 34 is manufactured using super hard metal and has wear resistance like the fixed blade body 1 and the movable blade body 2, and is manufactured using structural steel. The pin 31 is brazed.

  The biasing member 5 is a disc spring, and a plurality of the biasing members 5 are passed through the male screw 32 of the pin 31 and contacted with the vicinity of the shaft hole 14 of the fixed blade body 1 and the nut 33, thereby The taper bush 34 is urged toward the fixed blade body 1, and the movable blade body 2 is pressed against the fixed blade body 1 through the taper bush 34. The disc springs are overlapped by dividing the four pieces into two pieces and putting the larger diameters back to back. By moving the nut 33 in the axial direction of the pin 31, the urging force of the urging member 5 is adjusted, and the contact force of the movable blade body 2 with respect to the fixed blade body 1 is adjusted. That is, when the urging force of the urging member 5 is strong, the contact force is increased, and the weft is reliably cut without escaping between the two cutting edges 11 and 21, but the wear of the both cutting edges 11 and 21 is increased. On the contrary, if the urging force of the urging member 5 is weak, the abutting force becomes small and the weft is easy to escape and easily causes a weft cutting error, but the wear of the blade edges 11 and 21 is suppressed.

  In the present embodiment, at least one of the fixed blade body 1 and the movable blade body 2 provided with the protrusion 16 is the fixed blade body 1, and the protrusion 16 is provided only on the fixed blade body 1. More specifically, the fixed blade body 1 has two surfaces defined by the step 15 on the surface (inner surface) facing the movable blade body 2, and the flat surface on the side opposite to the blade 12 with the step 15 as a boundary. The protrusion 16 protrudes toward the body 2. Therefore, the protrusion 16 is provided in a region opposite to the blade portion 12 with respect to the rotation center, and in a region that always faces the movable blade body 2 while the movable blade body 2 is rotating. .

  Hereinafter, based on the case of the present embodiment in which one of the fixed blade body 1 and the movable blade body 2 where the protrusion portion 16 is provided is the fixed blade body 1 in the region where the protrusion portion 16 is to be provided, FIG. It explains using. As shown in FIG. 1 (c), the region opposite to the blade portion 12 with respect to the center of rotation is the state where the movable blade body 2 is at the cutting operation start position and is most open, as shown in FIG. ), The movable blade body 2 is fixed at a position opposite to the blade portion 12 with respect to the rotation center during the rotation of the movable blade body 2 until the movable blade body 2 is in the cutting operation end position and is in the most closed state. This is the region of the base 13 of the blade body 1. In FIG. 3, a line perpendicular to the line connecting the intersection A and the rotation center O between the blade edges 11 and 21 at the start of the cutting operation in which the movable blade body 2 is drawn with a solid line passes through the rotation center O. Of the two regions of the base 13 of the fixed blade body 1 defined by the above, the region on the opposite side of the blade 12 is defined as a first region. In addition, a line perpendicular to the line connecting the intersection B and the rotation center O between the blade edges 11 and 21 at the end of the cutting operation in which the movable blade 2 is drawn with a two-dot chain line passes through the rotation center O. Of the two regions of the base 13 of the fixed blade body 1 defined by the above, a region on the opposite side of the blade 12 is defined as a second region. In the present invention, a region where the first region and the second region overlap is a region opposite to the blade portion 12 with respect to the rotation center O. During the rotation of the movable blade body 2, the region that always faces the movable blade body 2 is that after the movable blade body 2 rotates from the cutting operation start position to the cutting operation end position in the overlapping region, This is a region that always faces the movable blade 2 during the rotation stroke of the movable blade 2 from the cutting operation end position to the cutting operation start position. Therefore, the region is a region drawn by hatching in FIG. 3, and the protrusion 16 is provided in the region. In the present invention, the rotation of the movable blade body 2 is set in a direction perpendicular to the line of intersection between the line connecting the intersection A and the rotation center O and the line connecting the intersection B and the rotation center O. The direction. In the present embodiment, the protrusion 16 extends beyond the hatched area, and the portion of the protrusion 16 that always faces the movable blade body 2 is substantially the entire area in the rotation direction. Extending over. The protrusion 16 extends in such a manner that the region opposed constantly shown by the oblique lines extends over almost the entire region in the rotation direction. The protrusion 16 having a sufficiently long length always contacts the movable blade 2. It is desirable that the smooth rotation of the movable blade body 2 can be sufficiently ensured over the entire rotation range. However, if the protrusion 16 extends over half or more of the hatched area in the rotation direction, the movable blade body 2 can be smoothly rotated over the entire rotation range. be able to. As described above, in the region where the protrusion 16 is to be provided, one of the fixed blade 1 and the movable blade 2 on which the protrusion 16 is provided has been described as the fixed blade 1. Well, in that case, it will be explained similarly.

  The protrusion 16 is a part of the fixed blade body 1 and is formed by processing a plate having a uniform thickness. Specifically, the inner surface of the plate body is originally a flat surface extending over the entire surface, and the periphery of the shaft support portion of the blade portion 12 and the base portion 13 is cut (milled) in parallel with the original plane. The wall thickness is reduced to obtain the milled surface 17. As a result, the portion where the thickness is maintained becomes a protrusion 16 that protrudes toward the movable blade body 2 after assembly, and protrudes from the milling surface 17 by the amount of cutting, and the protrusion 16 and the protrusion A step 15 is formed between the adjacent surface 17 a of the portion 16.

  Further, in the present embodiment, the milling surface 17 is a single plane continuous to the blade portion 12, but may not necessarily be a single plane as long as it does not interfere with the movable blade body 2. Specifically, the milling surface 17 may be recessed at the adjacent surface 17a portion of the protrusion 16 or the like, or the thickness may be increased stepwise toward the protrusion 16.

  The frame 6 has one end (not shown) of the cutter bracket 61 fixed, and the base 13 of the fixed blade body 1 is overlapped with the other end of the cutter bracket 61 on the outer surface side of the front end side and fixed with a countersunk screw 62. . The countersunk screw 62 includes a head portion 62a and a screw portion 62b continuous to the head portion 62a. The head portion 62a is inserted into the receiving hole 18 on the distal end side of the base portion 13 of the fixed blade body 1, and the screw portion 62b is connected to the cutter bracket 61. Are respectively fitted in the screw holes 61a. Further, the head portion 62a is formed in a tapered shape having a larger diameter toward the movable blade body 2, the receiving hole 18 is formed in a corresponding tapered shape, and the upper surface of the head portion 62a protrudes from the inner surface of the protruding portion 16. Since it is recessed and fixed, it does not interfere with the movable blade 2 during rotation. Note that the end surface of the head 62a may be the same surface as the inner surface of the protruding portion 16, or may protrude slightly if it does not interfere with the movable blade body 2.

  In addition, a rotary solenoid 41 serving as a rotation source is fixed to the frame 6, and one end portion of a driving force transmission lever 43 is fixed to a rotating shaft 42 of the rotary solenoid 41. A roller 44 is rotatably supported on the other end of the driving force transmission lever 43 in a state parallel to the rotation shaft 42, and the roller 44 is engaged with the tip of the base 23 of the movable blade body 2.

  The movable blade body 2 has a U-shaped groove formed by forming the tip of the base portion 23 into a bifurcated U-shape, and the U-shaped groove is an engagement notch 45 that guides the roller 44 so as to be movable. It becomes.

  The rotating means 4 includes the rotary solenoid 41, the rotating shaft 42, the driving force transmission lever 43, the roller 44, and the engagement notch 45 described above.

  In the second embodiment of the weft cutting device of the loom, as shown in FIG. 4, the method of forming the protrusion 16 of the fixed blade 1 is different from the first embodiment. The fixed blade 1 is formed by fixing and integrating two plates, and uses a plate for the protrusion 16 and a plate of the main body portion 1 a other than the protrusion 16. That is, the protrusion 16 is a plate of a member different from the plate of the main body portion 1a that is a member of the base portion 13, and is a region opposite to the blade portion 12 side with respect to the rotation center, and is always on the other side. It is formed by being fixed with respect to the base 13 in a region opposite to. The protrusions 16 are rectangular elongated plates that extend beyond the rotational range of the movable blade body 2 on both sides, and both end portions thereof are detachably fixed to the fixed blade body 1 with screw members 19.

  Since the plate for the protrusion 16 is thinner than the head of the screw member 19, the head of the screw member 19 cannot be accommodated therein. If the location where the screw member 19 is disposed is provided in the rotation range of the movable blade body 2, the function of the protrusion 16 is lost. Further, since the plate for the protrusion 16 is as thin as about 1 mm, a female screw cannot be provided. For this reason, the screw member 19 is inserted from the outer surface side of the fixed blade 1 to the plate for the protrusion 16. The method of screwing into the provided female screw cannot be used. For this reason, the both ends of the protrusion 16 are disposed at locations (the non-interference range of the movable blade 2) that are out of the rotation range of the movable blade 2. Corresponding to the female screw 20 provided in the main body portion 1 a, the plate for the protrusion 16 is provided with insertion holes at both ends, and the head of the screw member 19 (round screw) to be fixed is a movable blade rather than the protrusion 16. Although protruding toward the body 2, there is no hindrance to the rotation of the movable blade body 2.

  If the plate for the protrusion 16 is made of a hard material such as a stainless steel plate, wear of the protrusion 16 can be suppressed. If a low friction material such as a brass plate is used, wear of the movable blade 2 is suppressed. be able to.

  The protrusion 16 may be formed by a single plate, or may be formed by stacking a plurality of plates having the same thickness or different thicknesses.

  The weft cutting operation by the weft cutting device of the loom described above is as follows. Both the blade edges 11 and 21 intersect with each other on the rotation surface of the movable blade body 2, and the intersection position (intersection) advances toward the weft yarn as the movable blade body 2 rotates, thereby cutting the weft yarn. . First, at the start of the cutting operation, the cutting edges 11 and 21 are opened to the maximum as shown in FIG. 1, and a weft not shown is passed between the opened cutting edges 11 and 21. Subsequently, the rotary solenoid 41 is driven to rotate the movable blade body 2, and the blade edges 11 and 21 are closed as shown in FIG. 2 to cut the weft. The movable blade body 2 is urged toward the fixed blade body 1 by the urging member 5 over the entire rotation range of the movable blade body 2, and the fixed blade body 1 and the movable blade body 2 While the interval is constrained by the pivotal support member 3, it always abuts only at two points, that is, the rotation center side of the protrusion 16 and the intersecting position of the cutting edges 11 and 21. Thereafter, the rotary solenoid 41 rotates in the opposite direction to reverse the movable blade body 2, and the cutting edges 11 and 21 are fully opened as shown in FIG. Thereafter, the same operation is repeated.

  The present invention is not limited to the above embodiment. For example, the protrusion 16 may be provided not on the fixed blade body 1 but on the movable blade body 2, or on both the fixed blade body 1 and the movable blade body 2. The biasing member 5 may be a coil spring instead of a disc spring, and is movable with respect to the fixed blade 1 by providing a plate spring on the outer surface of the movable blade 2 and pressing the outer surface. The blade body 2 may be pressed. In any case, at least the blade 22 side of the movable blade 2 is pressed toward the fixed blade 1 by the urging force of the urging member 5. In addition, the fixed blade 1 and the movable blade 2 have the tip portions of the blade portions 12 and 22 bent obliquely with respect to the other portions, and as shown in FIG. Although it is in a form, it may be a straight form without bending. Moreover, although the fixed blade body 1 and the movable blade body 2 are both formed from a single member, they may be formed from different members and integrated by bolts or the like. For example, the blade portions 12 and 22 are formed of a super hard material, and the base portions 13 and 23 and the blade portions 12 and 22 are fastened via bolts to form the fixed blade body 1 or the movable blade body 2. In addition, for example, the cutting edges 11 and 21 of the cutting edges 12 and 22 are formed of a super hard material, and the cutting edge is fastened to the main body via bolts to form the cutting edge, or the cutting edge is formed by shrinking. The blade is formed by bonding to the main body. Further, for example, the base portion 13 may be formed of a first portion that surrounds the rotation shaft and is attached to the frame 6, and a second portion that is connected to the first portion and is continuous with the blade portion 12. Good.

(A)-(C) is a left side view of the first embodiment showing the state of the first embodiment of the weft cutting device of the loom, the state at the start of the cutting operation, and a front view of the first embodiment. is there. (A) and (b) are a left side view and a front view showing a state at the end of the cutting operation in the first embodiment of the weft cutting device of the loom. It is explanatory drawing which shows the area | region in which the projection part 16 is provided. (A) to (c) are a fixed blade body of a second embodiment of a weft cutting device of a loom, a left side view of the second embodiment showing a state at the start of the cutting operation, and a front view of the second embodiment. is there.

Explanation of symbols

1 fixed blade body, 1a main body part, 2 movable blade body, 3 axis support member, 4 rotating means, 5 biasing member,
6 frames,
11 cutting edges, 12 cutting edges, 13 bases, 14 shaft holes, 15 steps, 16 protrusions,
17 milling surface, 17a adjacent surface, 18 receiving hole, 19 screw member, 20 female screw 21 blade edge, 22 blade portion, 23 base portion, 24 shaft hole,
31 pin, 32 male thread, 33 nut, 34 taper bush, 35 through hole,
41 rotary solenoid, 42 rotating shaft, 43 driving force transmission lever, 44 rollers,
45 engagement notch,
61 cutter bracket, 61a screw hole, 62 countersunk screw, 62a head, 62b screw

Claims (4)

A fixed blade body (1), a rotatable movable blade body (2), and a biasing member (5) for bringing the fixed blade body (1) and the movable blade body (2) into contact with each other;
The fixed blade body (1) and the movable blade body (2) are respectively formed by a blade portion (12, 22) and a base portion (13, 23) that is continuous with the blade portion (12, 22) and includes a rotation center. In the weft cutting device of the weaving machine,
At least one base portion (13, 23) of the fixed blade body (1) and the movable blade body (2) is a region opposite to the blade portion side with respect to the rotation center, and the movable blade body (2). During rotation, a protrusion (16) that protrudes toward the other side is provided in a region that always faces the other side,
The fixed blade body (1) and the movable blade body (2) are brought into contact with each other only at two positions of the protrusion (16) and the blade edge (11, 21) of the blade portion (12, 22) by the biasing member (5). A weft cutting device for a weaving machine.   2. The loom according to claim 1, wherein the protrusion (16) extends over a half or more of the region facing the other at all times in the rotational direction of the movable blade (2). Weft cutting device.   The weft cutting device for a loom according to claim 2, wherein the protrusion (16) is formed by fixing a member different from the base (13, 23) to the base (13, 23). .   The weft cutting device for a loom according to claim 3, wherein the another member is detachably fixed to the base (13, 23) via a screw member (19).

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