JPH0665838A - Carrier band driving unit in rapier loom - Google Patents

Abstract

PURPOSE:To simplify the transmission mechanism of the driving system for the weft-feeding unit in a rapier loom thus largely reduce the mass and inertia of the driving system and increase the rotation speed of the loom. CONSTITUTION:A driving roller 16 is set so as to move back and farth along the U-shaped guide for a carrier band 11 in contact with a part of the carrier band 11. The power shaft of the motor 19 which can revolve in both positive and negative directions is connected to the driving roller 16 to reciprocate the carrier band as the motor revolves positively and negatively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for a carrier band in a rapier loom, in which inertia of the drive system is reduced to enable high speed rotation.

[0002]

2. Description of the Related Art As a rapier loom, there is known a rapier weaving machine using a carrier band having flexibility and excellent bending elasticity, such as steel, synthetic resin and FRP. In this type of rapier loom, a disk-shaped band wheel is installed on the outside of the side frame of the loom with its axis oriented in the front-rear direction, and a rack or fan gear meshes with a pinion fixed to the axis of this band wheel. Alternatively, the sector gear is connected to the motor shaft through a crank or cam so that it can reciprocate. Then, the carrier band is wound around the band wheel so as to make a half turn and both ends face inward (loom side) so as to form a U shape, and the rack or sector gear alternately rotates in the forward and reverse directions. By doing so, the carrier head fixed to the upper end of the carrier band moves forward and backward horizontally to carry out weft insertion.

It is known that the carrier band is wound around the entire circumference of the band wheel, the lower end is fixed to the band wheel, and the carrier head is fixed to the upper end (free end). Further, instead of using the band wheel described above, a guide path for guiding the carrier band by curving it in a U shape is formed by an array of rollers or the like, and the semi-arcuate curved portion of the carrier band has a shed. There is known a device in which a pair of drive rollers for sandwiching a carrier band are provided at the side ends, a pinion is fixed to the shaft of the drive rollers, and the pinion is reciprocally rotated in the same manner as described above.

[0004]

In a carrier band driving device using a band wheel, the outer diameter of the band wheel needs to be set in accordance with the moving length of the carrier band according to the weaving width of the rapier loom. Therefore, the band wheel inevitably becomes large in size, and the transmission mechanism for changing the rotation speed of the motor and converting the rotation direction into the forward direction and the reverse direction is provided, so that the mass and inertia of these drive systems are large. Therefore, the rotation speed of the loom cannot be increased, and 400 RPM when the weaving width is 190 cm.
However, when the weaving width is 160 cm, the limit is 500 RPM and the noise is large.

When a drive roller smaller than the band wheel is used, the drive system is lightened by the amount corresponding to the mass difference, but on the contrary, it is necessary to increase the rotation speed of the drive roller. Also, because the other transmission mechanism is the same, such as the one-way rotation of the motor being converted to the forward direction and the reverse direction by a mechanical system such as a cam or crank, it cannot be speeded up like the one equipped with a band wheel. It was In particular,
If the weaving machine has left and right weft insertion devices, a long connecting shaft that spans the entire width of the loom and gear transmission mechanisms at both ends of the loom are required for synchronous operation of the left and right band wheels or drive rollers. There was a problem that the inertia increased further. Note that the carrier band is also changed from steel to synthetic resin or FRP, but the weight reduction due to this change is slight, and it hardly contributes to speedup. Further, conventionally, since the rotation direction is mechanically converted, the velocity change curve of the carrier band is limited to the sine curve.

According to the present invention, the carrier band is driven by a driving roller smaller than the band wheel, a forward / reverse rotation motor is used as the driving source, and the rotation direction of the motor itself is changed to drive the driving system. The simplification of the mechanical transmission mechanism of No. 1 significantly reduces the mass and inertia of the drive system, and enables the rotation speed of the loom to be improved.

[0007]

A drive device for a carrier band in a rapier loom according to the present invention comprises reciprocally rotating a carrier band having a carrier head for weft transfer fixed to one end thereof along a U-shaped guide path. In a rapier loom in which the carrier head is horizontally moved straight and is put in, a drive roller for advancing and retracting in contact with a part of the carrier band is provided along the guide path, and the drive roller is provided with a straight line. It is characterized in that the output shaft of a motor capable of reverse rotation is connected.

The rapier loom of the present invention is a single rapier system in which a weft thread is inserted into the entire width of the loom with one carrier band from one side of the loom, and carrier bands are inserted from both sides of the loom, and one is provided at the center. Any of the two rapier systems in which the weft is transferred from one to the other may be used. Also,
The carrier head (rapier) at the tip of the carrier band may be of an ironing type in which the weft is inserted while squeezing it, or a grip type in which the weft is grasped and inserted. The motor used is a motor capable of reversing and shifting, such as a servo motor, an inverter-controlled synchronous motor, a pulse motor, an AC variable-speed motor, and a brushless motor. Larger ones are preferred. The output shaft of the motor may be directly connected to the drive roller, and a transmission mechanism other than the direction changing mechanism may be interposed between the output roller and the drive roller. The transmission mechanism preferably has a speed ratio of 1 or less.

[0009]

When the motor is normally or reversely rotated by a program, the carrier head is inserted into the shed or returned. Then, the transmission mechanism for switching the rotation direction and shifting used in the conventional drive system becomes unnecessary,
Since the mass and inertia of the drive system are smaller than before and the velocity change curve can be set arbitrarily, the weft insertion movement can be sped up. Then, by selecting a motor having a large starting torque and a small rotor inertia, the direction change and the speed change can be performed more smoothly, and the drive roller and the carrier band are provided with meshing irregularities so that the carrier Band slip has disappeared,
The transmission becomes reliable.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 10 is a weaving device for a rapier loom, 11 is a carrier band, and 12 is a carrier head. The carrier band 11 is a molded product of synthetic resin, is bent into a U shape, and is supported so that the straight portions at both ends thereof are horizontal. That is, a pair of guide rollers 13a and 13b for sandwiching the carrier band 11 from inside and outside the curve are arranged at both ends of the semi-circular curved portion of the carrier band 11 and two places in the middle thereof, and the upper shuttle Linear sliding guide 14 on the mouth side straight part
However, the band storage cylinders 15 are respectively installed in the lower straight portions to form the U-shaped guide path of the carrier band 11.

Of the four sets of guide rollers 13a and 13b, the upper guide rollers 13a and 13b and the sliding guide 14 are provided.
And two driving rollers 16 and 16 are provided in series so as to be in contact with the lower surface of the carrier band 11, and a pressing roller 16a for sandwiching the carrier band 11 on each driving roller 16 and 16. , 16a are provided. Then, a driving roller 17 having the same diameter as that of the driving roller 16 is pressed against the lower surfaces of the two driving rollers 16, 16 and the driving roller 17 is driven by an AC servo via a driving pulley 17a, an endless belt 18 and a motor pulley 19a. The motor 19 is connected.

In the above structure, the AC servomotor 1
When 9 is driven in the forward direction according to the program and the motor pulley 19a rotates to the left, the carrier band 11 rotates to the right and the carrier head 12 advances to the right to insert a weft (not shown) into the shed. At this time, the sliding guide 14 located on the shed side of the drive roller 16 prevents the carrier band 11 from hanging downward by its own weight and assists the carrier head 12 to go straight. The carrier band 11 in the lower band storage cylinder 15 is pulled out from the band storage cylinder 15 as the carrier head 12 advances. Then, the AC servomotor 19 is driven in the reverse direction according to the program, and when the motor pulley 19a rotates to the right, the carrier band 11 rotates to the left, the carrier head 12 returns to the original position, and the opposite side is stored again in the band storage cylinder 15. To be done.

FIG. 2 shows an example in which a toothed belt is used as the carrier band 21, and the toothed portion 2 has a rack-shaped lower surface.
The two drive rollers 22, 22 formed on the lower surface of the carrier band 21 are formed on the lathe 1a as described above.
1a is a toothed pulley that meshes with each drive roller 2
Pressing rollers 23, 23 are in pressure contact with the upper portions of 2, 22. A driving gear 25 having a diameter that is slightly smaller than that of the driving gear 24 meshes with a driving gear 24 that is coaxial with the driving roller 22 and has the same diameter. A driving pulley (toothed pulley) 26 that is coaxial with the driving gear 25 is shown in FIG. Similarly, the AC servomotor 19 is driven to rotate.

The carrier band 31 shown in FIG. 3 has rack portions 31a, 31a formed on the left and right side edges,
To the left and right of the carrier band 31, the rack portion 31a,
A pinion 32 that meshes with 31a is provided as a drive roller, and the left and right pinions (drive rollers) 32 are rotated by driving the AC servomotor 19 through an intermediate gear (not shown). Further, the carrier band 36 shown in FIG. 4 has a large number of pin holes 36a formed at equal pitches along the center line, and the pins 37a of the pin wheel 37 on the lower surface are fitted into the pin holes 36a as driving rollers. Then, the pin wheel (driving roller) 37 is rotated by driving the AC servo motor 19. Note that 38 is a pressing roller.

In the above embodiment, the drive roller 16,
22, 32, 37 are carrier bands 11, 21, 3
It can be provided along the curved portions of 1 and 36, and can be provided in two or more places. Further, the illustrated weft inserting device can be installed so as to face the left and right sides of the loom. In that case, the AC servomotor 1 is provided for each of the left and right drive rollers.
9 is connected.

[0016]

As described above, the drive device for the carrier band in the rapier loom of the present invention is provided with a drive roller for advancing and retracting along a U-shaped guide path of the carrier band in contact with a part of the carrier band. Since the output shaft of a motor capable of forward and reverse rotation is connected to the drive roller, the carrier head is moved forward and backward through the shed to carry out wefting by rotating the motor forward or backward in accordance with a program. Therefore, the transmission mechanism for switching the rotation direction and shifting, which is used in the conventional drive system, becomes unnecessary, the mass and inertia of the drive system become smaller than before, and the shape of the speed change curve of the carrier band is reduced. Since it can be arbitrarily set without being limited to the conventional sine curve, it is possible to speed up the weft insertion movement. For example, when the weaving width is 160 cm, the rotation speed can be greatly increased from the conventional 500 RPM to 700 to 800 RPM. You can Then, as shown in the embodiment, by providing the driving roller and the carrier band with the unevenness for engagement,
Slip of the carrier band is eliminated and transmission is ensured.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment.

FIG. 2 is an enlarged view of a main part of the second embodiment.

FIG. 3 is an enlarged view of a main part of the third embodiment.

FIG. 4 is an enlarged view of a main part of the fourth embodiment.

[Explanation of symbols]

 10: Weft insertion device 11, 21, 31, 36: Carrier band 12: Carrier head 13a, 13b: Guide roller 14: Sliding guide 15: Band storage cylinder 16, 22, 32, 37: Drive roller 16a, 23, 38 : Pressing roller 17: Driving roller 17a: Driving pulley 18: Endless belt 19: AC servo motor 19a: Motor pulley 24: Drive gear 25: Driving gear 26: Driving pulley (toothed pulley)

Claims (1)

[Claims] 1. A carrier band having a carrier head for transporting a weft yarn fixed to one end thereof is reciprocally rotated along a U-shaped guide path so that the carrier head is horizontally moved straight and inserted. In a rapier loom, a drive roller is provided along the guide path for advancing and retracting in contact with a part of the carrier band, and a forward and reverse motor output shaft is connected to the drive roller. Drive device for carrier band in loom.