JPH026857B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention combines a rotating blade and a swinging member having a weft hooking groove, and the swinging member is moved in accordance with the rotational movement of a rotating arm. The present invention relates to a weft cutting device for a shuttleless loom that is swingable so that weft cutting can be easily and reliably performed in a shuttleless loom, and that has a simple structure and excellent durability.

(Prior art) Conventionally, as a weft cutting device installed on the opposite side of the weft insertion side of a shuttleless loom, a heat cutter in a water jet loom or a scissor type cutter in an air jet loom, etc. has been generally used. The cutter was configured to cut the weft end portion stretched between the fabric end and the gripping yarn after picking three to four times.

(Problems to be Solved by the Invention) However, the heat cutter has the disadvantage that it consumes a very large amount of power, and as the speed of the loom increases, the power consumption increases further. Since the molten material adheres and causes cutting errors, it is often necessary to remove the molten material, and in severe cases, the heat cutter has to be replaced. In addition, it was necessary to prepare various types of heat cutters depending on the denier of the weft threads, and it was time-consuming to replace them. Moreover, since the weft yarns are thermally cut, depending on the type of weft yarns, lumps may occur at the cut portions of the weft yarns, which may cause a decrease in the quality of the woven fabric. Furthermore, with heat cutters, it is virtually impossible to cut hard fibers such as glass fibers, carbon fibers, and soft fibers, or it is extremely difficult to cut hard fibers such as glass fibers, carbon fibers, and soft fibers due to harmful combustion. There were certain restrictions on the type of cloth. On the other hand, with scissor-type cutters, the cutter repeatedly cuts at a certain location, which can wear out on one side and cause cutting errors. In addition, the cutter blade often needs to be polished, and the loom is cut every time. When rotating at high speeds of 500 revolutions per minute or more, there was a risk of damage to the cutters due to mechanical problems, which was one of the factors that prevented the mechanism from increasing its speed.

In this way, the conventional cutters for shuttleless looms have not been able to fully meet the recent demands for faster mechanisms, more diversified weaving, and higher quality woven fabrics, and have therefore suffered from the various problems mentioned above. The industry has long desired the appearance of a katsuta that solves this problem.

(Means for Solving the Problems) The weft cutting device (hereinafter referred to as cutting device) 1 in the shuttleless loom of the present invention includes a rotary blade 2 (rotation direction does not matter) having a blade portion 13 on the outer periphery, Edge part 2
Hooking groove 2 for hooking the weft end portion 21 to
2 is provided with a recessed swing member 4. The swinging member 4 has an angular range around the swinging center portion 16 between a state in which the hooking groove 22 overlaps the blade portion 13 of the rotary blade 2 and a state in which the hooking groove 22 is separated from the blade portion 13. It is swingable in the hook groove 2.
2 is biased by a spring (coil spring, plate spring, etc.) 30 in the rotation direction in which the blade portion 13 overlaps with the blade portion 13. Then, the hooking groove 22 of the swinging member 4 shifts from the state where it overlaps the blade part 13 of the rotary blade 2 to the state where it is separated from the blade part 13, so that the weft end portion 21 to be cut is moved to the end of the blade part 13 of the rotary blade 2. The swinging member 4 is adapted to be relatively guided by the edge portion 20 and hooked on the hook groove 22, and the swinging member 4 is attached to the lower edge portion of the reed 36 or the reed holder portion 37 that holds the reed 36 during reed beating. In response to the rotation movement of the rotation arm 3 that is pushed and rotated, the hook groove 22 engages the blade portion 13.
It is configured to rotate in the direction of rotation in which it is in a state where it is separated.

(Function) During operation of the mechanism, when the rotary blade 2 is rotated and the swinging member 4 is set in a swinging state, the weft end portion stretched between the weft end 11 and the gripping thread 12 due to weft insertion. 21 is cut by the cutting device 1 of the present invention after picking three or four times, and its operation is as follows.

That is, the rotating arm 3 is pushed by the reed holder part 37 and rotates, and as a result, the swinging member 4 moves in the rotation direction A in which the hooking groove 22 is separated from the blade part 13 of the rotary blade 2.
When the weft end portion 21 to be cut (the weft end portion closest to the rotating blade 2 and the swinging member 4) is hooked into the hooking groove 22 (see Fig. 5), the rotating arm 3 The swinging member 4 rotates in the direction opposite to the above, and as a result, the swinging member 4 rotates in the direction B in which the hooking groove 22 and the blade portion 13 overlap, so that the weft end portion 21
is lifted in the hooked state (see Figure 6),
Or it can be pulled down (see Figure 9) and hook groove 2
2 overlaps with the blade part 13, the tension of the weft end portion 21 is increased, and the weft end portion 21 is stably held in the hooking groove 22,
The weft end portion 21 is easily and reliably cut by the rotary blade 2 (see FIG. 7). After that, the swinging member 4 is moved in the direction A (the hooking groove 22 is
3), the weft end portion to be cut next is guided relative to the edge portion 20 and hooked into the hooking groove 22 as shown in FIG. Become. In addition, the weft end portion 2
Even if the blade 1 is not cut, the rotation of the swing member 4 in the A direction causes the hook groove 22 to be separated from the blade part 13 of the rotary blade 2, so that it will not be cut. When the swinging member 4 rotates again in the direction B, the weft end portion, together with the weft end portion to be cut next, is cut by the rotary blade 2 under increased tension. It will definitely be cut. Therefore, there is no risk of an accident such as the uncut weft end portion becoming entangled with the swinging member 4. Since the swinging member 4 performs opening/closing motion via the rotating arm 3 only during reed beating, the opening/closing motion time that occupies one reciprocating time of the reed can be set to be extremely short, and as a result, the weft This means that the contact time between the end portion 21 and the rotary blade 2, that is, the time for cutting the weft end portion 21, can be made very long.

(Embodiment) Next, an embodiment of the present invention will be described based on the drawings, taking as an example the case where the present invention is applied as a weft thread cutting device in a water jet room.

First Embodiment In FIGS. 1 to 7, a cutting device 1 of the present invention includes rotary blades 2 arranged above and below, and a swinging member 4 that swings via a swinging arm 3. The blade 2 and the swinging member 4 are fixed to one end 9a of a rotating shaft 9 and one end 10a of a swinging shaft 10, respectively, which are pivotally supported by bearings 6 and 7 provided above and below a bearing part 5. The cage is disposed close to the fabric edge 11 between the fabric edge 11 and the gripping thread 12.

As shown in FIGS. 1 to 3, the rotary blade 2 is made of, for example, a hardened stainless steel blade, cemented carbide, ceramic, etc., and has a thin disk shape, and a blade portion 13 is formed on the outer periphery of the rotary blade 2. It is fixed to one end 9a of the rotating shaft 9 using a screw inserted through a screw hole drilled in its center, and is rotated by the rotation of a pulley 15 fixed to the other end 9b of the rotating shaft 9. It is made to rotate.

As shown in FIGS. 1 to 3, the swing member 4 has a base portion 17 having a swing center portion 16 fixed to one end portion 10a of the swing shaft 10, so that the rotary blade 2 is sandwiched in close proximity to the base portion 17. rocking pieces 19, 19 are protruded in parallel to each other, and edge portions 20 of the rocking pieces 19, 19
V-shaped hooking grooves 22, 22 for hooking the weft end portion 21 are formed in opposite sides. The swinging member 4 has hook grooves 22, 22 connected to the blade portion 1 of the rotary blade 2, with the swinging center portion 16 as the center.
The swinging member 4 can swing in an angular range between a state in which the hook grooves 22 and 22 overlap the blade part 13 and a state in which the hook grooves 22 and 22 are separated from the blade part 13. By shifting the blade portion 13 from the hanging state to the separated state, the weft end portion 21 to be cut is guided relatively to the edge portion 20 and is hooked on the hooking groove 22. ,
The hooking groove 22, which is separated from the blade portion 13, is arranged so as to be approximately located on the vertical line L passing through the blade end 13a of the rotary blade 2 (see FIG. 5). The groove depth of each hooking groove 22 is set so that about two to three weft yarns can be hooked into the hooking groove 22.

Further, a bent part 25 of a dogleg-shaped lever 23 is fixed to the other end 10b of the swing shaft 10, and one end 27 of the short piece 26 is attached to the side surface of the bearing part 5. Spring 30 fixed to the lower end of section 28
The other end 31 is fixed, and the swing shaft 6 is biased in the direction of rotation in which the hook groove 22 overlaps the blade portion 13. Note that the short piece 26
is held by a stop pin 29 (see Fig. 4) protruding from the side surface 28 of the bearing part 5 so that the hook groove 22 and the blade part 13 are overlapped to the extent that cutting the weft thread is not hindered. be done. On the other hand, the long piece 32 of the dogleg-shaped lever 23 becomes the rotating arm 3 that rotates the swing shaft 10 in a direction opposite to the urging direction,
Normally, the lower end portion 33 of the bearing portion 5 is inclined obliquely downward toward the rear so that the rear surface portion (the surface portion facing the reed 36) 35 of the bearing portion 5 projects rearward. and,
As described later, the reed holder part 3 that holds the reed 36
As a result, the swinging member 4 is pushed forward by the pressing portion 39 of No. 7, so that the hook grooves 22, 22 of the swing member 4
3, and when the rotation angle of the rotating arm 3 reaches its maximum, the hooking groove 2
2, 22 and the blade portion 13 are separated from each other. The shoding is completed at the same time as the two are separated. (See Figures 4-5). In addition, the fourth
As shown in the figure, the horizontal movement distance L1 of the rotating arm lower end 33 as the rotating arm 3 rotates is the horizontal movement distance L2 of the pressing part 39 of the reed holder part 37.
The time that the reed holder part 37 is in contact with the rotating arm 3 is considerably smaller than the time that the reed holder part 37 is apart from the rotating arm 3. It is designed to be smaller. Further, a roller 40 is pivotally attached to the lower end portion 33 of the rotating arm 3 in order to reduce friction between the roller 40 and the pressing portion 39 of the reed holder portion 37. Further, a fixing piece 42 for fixing the cutting device 1 to the tenter attachment bar 41 is integrally provided on the bearing portion 5, and the tenter attachment bar 41 is fixed between the fixing piece 42 and the clamping piece 43. After pinching,
By tightening bolts on both sides of the tenter attachment bar 41, the cutting device 1 is fixed to a predetermined location of the loom. In FIGS. 1 and 2, reference numeral 45 denotes a guide plate having a guide hole 47 for guiding the waste yarn 46 twisted by a waste yarn false twisting device (not shown).

Next, the operation of the cutting device 1 shown in this embodiment will be explained based on FIGS. 4 to 7.

That is, when the reed holder part 37 is in a state away from the rotating arm 3, the spring 3 is released as shown in FIG.
The hooking grooves 22, 22 and the blade part 1 are
3 are overlapped, and the reed 36 is the orimae 4.
After the reed holder portion 37 and the rotating arm 3 come into contact with each other as the reed holder portion 37 moves forward toward the point 9, the swinging member 4 moves to a state where its hook groove 22 has separated from the blade portion 13 due to the rotation of the rotating arm 3. It rotates in the rotation direction A. The weft end portion 21 to be cut at that time is guided relatively to the edge portion 20 of the swinging member 4, and immediately after the hooking grooves 22, 22 leave the blade portion 13, that is, when the beating is completed. Immediately after, it is hooked into the hook grooves 22, 22 as shown in FIG. Thereafter, when the reed 36 moves backward in the direction away from the front weave 49, the rotating arm 3 is moved to the fourth position by the biasing action of the spring 30.
The state shown in the figure is returned, and as a result, the swinging member 4 is rotated in the opposite direction B (see FIG. 6). And the hook grooves 22, 22 are connected to the blade part 13.
By overlapping with the hook grooves 22, 22, the bridging weft section 50 (see Fig. 3) is in a state where the tension is increased and the area of the cut surface is at its maximum. The weft end portion 21 is easily, quickly and reliably cut by the rotary blade 2 (see FIGS. 6 and 7). In addition, the reed holder part 3
If we compare the time during which the reed holder part 37 is away from the rotating arm 3 and the time during which the reed holder part 37 is in contact with the rotating arm 3, as mentioned above, the former is considerably larger than the latter. Therefore, most of the time for one reciprocation of the reed holder section 37 is used for cutting the weft end portion 21. For example, the blade section 1 of the rotary blade 2
Even when the sharpness of the weft yarn end portion 21 becomes inferior, the errors in cutting the weft end portion 21 can be reduced as much as possible. Note that even if the weft end portion 21 is not cut by the rotary blade 2 due to wear of the blade portion 13 or the like, the swinging member 4 will be As a result, the hooking groove 22 rotates in the direction A away from the blade part 13, and the hooking groove 22 leaves the blade part 13 of the rotary blade 2 (see Fig. 5). The weft end portion 21 is connected to the swinging member 4
is rotated in direction B again, and the tension of the lifted weft end, together with the weft end to be cut next, is further increased due to twisting by the waste thread false twisting device, etc. It will definitely be cut. Therefore, there is no risk of an accident such as the uncut weft end portion 21 becoming entangled with the swinging member 4. Also, as mentioned above, the blade part 13
Since the swing member 4 is arranged so that the hook groove 22, which is separated from the rotary blade 2, is located approximately on the vertical line L passing through the blade end 13a of the rotary blade 2 (see FIG. 5),
The weft end portion 21 can be hooked by the hooking groove 22 at a position as close as possible to the reed barrel 36 that has been washed up to the fabric front 49.

Second Embodiment FIG. 8 shows another embodiment of the cutting device 1 of the present invention, in which the swinging member 4 and the rotary blade 2 configured in the same manner as in the previous embodiment are arranged upside down. At the same time, the hook groove 22 of the swinging member 4
By shifting from the state where it overlaps with the blade portion 13 of the rotary blade 2 to the state where it is separated from the blade portion 13, the weft end portion 21 to be cut is guided relatively to the edge portion 20 and is inserted into the hooking groove. It is configured to be hooked to 22. Contrary to the case in the above embodiment, the swinging member 4 rotates in the direction C1 in which the hooking groove 22 and the blade portion 13 overlap, so that the weft end portion 21 is pulled down in the hooked state and is hooked. Since the groove 22 overlaps with the blade portion 13, the weft end portion 21 is cut by the rotary blade 2. In the case of this embodiment, the rotation direction D1, D of the rotation arm 3, which rotates in the opposite direction to the biasing direction by being pushed by the reed holder portion 37 etc.
2 and the rotational directions C1 and C2 of the swinging member 4 are opposite (direction D1 and direction C1 are also opposite to direction D2).
and direction C2 correspond to each other), the rotational movement of the rotational arm 3 is transmitted to the swinging member 4 using a normal rotational direction conversion mechanism such as interposing a gear in between.

Third Embodiment FIG. 9 shows a portion of another embodiment of the cutting device 1 of the present invention, in which a plurality of (for example, four
The rotary blade 2 is combined with a swinging member 4 formed by cutting out hook grooves 22. Note that the groove depth of each hooking groove 22 can be made different so that the optimum groove depth can be used depending on the denier of the weft used.

In addition, in this rotation operation, the inner surface 5 of the swinging member 4
2 rubs against the outer surface 53 of the rotary blade 2, so that the hook groove 22 overlaps the blade part 13 of the rotary blade 2, and when the lower edge 55 of the hook groove 22 is formed as a blade part, , cutting device 1 of the present invention
is used in the waiter jet room, and even when the weft end portion 21 to be cut is wet and difficult to cut, errors in cutting the weft end portion 21 can be reduced as much as possible. Note that in the figure, direction E indicates the swinging state of the swinging member 4.

Other Examples The swinging member 4 is rotated according to the rotational movement of the rotating arm 3.
Another means for rotating the hooking groove 22 in the direction of rotation in which the blade part 13 is separated is to rotate the swinging center part 16 of the swinging member 4 around a fixed shaft protruding from the bearing part 5 or the like. and bias the swinging member 4 in the rotational direction in which the hook groove 22 overlaps the blade portion 13, and the swinging member 4 is rotated by the rotational movement of the swinging arm 3. It is possible to adopt a means for rotating the rotating arm 3 in the opposite direction to the direction of rotation, or a means for providing the rotating arm 3 integrally with the swinging member 4 and transmitting the rotational movement of the rotating arm 3 to the swinging member 4. In short, when the reed is struck, it is pressed by the lower edge of the reed 36 or the reed holder part 37 that holds the reed 36 (including the case where a separate pressing member fixed to the reed holder part 37 is interposed). Various means can be employed to cause the swinging member 4 to perform a required rotational movement in response to the rotational movement of the rotating arm 3 being rotated.

(Effect of the invention) By the swinging motion of the swinging member, the hooking of the weft end portion by the hooking groove can be carried out at a position close to the reed that has been driven up to the fabric front, and the hooking of the swinging member The weft end portion caught in the groove can be easily and surely cut by a rotating blade.
Therefore, similarly to cutting the weft end portions using a conventional heat cutter or the like, the weft end portions can be sequentially cut while leaving only three to four weft end portions. In addition, since the swinging member performs opening and closing motions only during beating of the reed through the rotating arm, most of the time for one round trip of the reed can be used to cut the weft end portion, making it possible to reliably cut the weft thread.

Even if a cutting error occurs with the rotating blade, since the swinging member performs a swinging motion, the uncut weft end portion will not get tangled with the swinging member and will be able to pass through the next swing of the swinging member. The rotary blade ensures reliable cutting during dynamic movement.

The cutting device of the present invention has a configuration in which a rotary blade and a swinging member are combined, and the swinging member is moved in accordance with the rotational movement of the rotating arm. Therefore, the structure of the entire device is simple, and the cutting device can be operated at high speeds of the loom. It's durable enough for driving.

The weft end portion is hooked into the hook groove of the swinging member and cut by the rotating blade while being pulled up or pulled down. In other words, since the weft end portion is cut by the rotating blade while its tension is increased, even hard fibers such as glass fibers, carbon fibers, and soft fibers can be cut. Therefore, it is now possible to use this loom to weave woven fabrics that were conventionally considered unsuitable for water jet looms and other shuttleless looms because it was difficult or virtually impossible to cut the weft threads. Become.

Since the power consumption is extremely low compared to a heat cutter, when the device of the present invention is used in a water jet room, the economical efficiency of the loom is improved accordingly.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a perspective view showing one embodiment of the invention together with its usage state, FIG. 3 is a plan view showing one embodiment of the invention together with its usage state, FIGS. 4 to 7 are explanatory views explaining the operation of the present invention, and FIG. FIG. 9 is a front view showing another embodiment of the invention, and FIG. 9 is an explanatory diagram showing a portion of another embodiment of the invention. 1... Cutting device, 2... Rotating blade, 3... Rotating arm, 4...
Swing member, 13...blade portion, 16...swing center portion, 20
...edge portion, 21...weft end portion, 22...hanging groove,
36... Reed, 37... Reed holder part.

Claims (1)

[Claims] 1 A rotary blade 2 which is a weft cutting device attached to the opposite side of the shuttleless loom and has a blade part 13 on the outer periphery.
and a swinging member 4 in which a hooking groove 22 for hooking the weft end portion 21 is recessed in the edge portion 20, and the swinging member 4 is rotated around the swinging center portion 16 thereof. , the hook groove 22 overlaps the blade portion 13 of the rotary blade 2 and the hook groove 22 overlaps the blade portion 1
The swinging member 4 is capable of swinging in an angular range with respect to the state where the hooking groove 22 is separated from the blade part 13.
The hooking groove 22 of the swing member 4 moves from the state where the blade portion 13 of the rotary blade 2 overlaps with the blade portion 1 .
3, the weft end portion 21 to be cut is guided relative to the edge portion 20 and hooked into the hooking groove 22, and the swinging member 4 The hook groove 22 moves the blade part 13 in response to the rotation of the rotating arm 3, which is pushed and rotated by the lower edge of the reed 36 or the reed holder part 37 that holds the reed 36 during reed striking. 1. A weft cutting device for a shuttleless loom, characterized in that it is configured to rotate in a rotational direction that separates the weft from the loom.