JPS59125940A - Wefting appartus in rapier loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft insertion device* in a rapier loom.

General Q: In a rapier loom, the weft supplied from the weft supply section is held and inserted by a weft conveyor that reciprocates in synchronization with the weaving operation of the loom.

Conventionally, the weft conveyor has been reciprocated by a crank mechanism Q that converts rotational motion into reciprocating motion. That is, as shown in FIG. 1, for example, the rotational movement of the drive shaft 1, which is rotated at a constant speed in synchronization with the weaving operation of the weaving machine, is caused by the rotation of the crank 2, crank arm 3, rack 4, idle gear 5, and shaft 6. Driven gear 7 and coaxial 6 that are stuck together (driving gear 8 that is stuck)
The reciprocating linear motion of the rack 9 was converted into a reciprocating motion via the rack 9, and the weft conveyor 10A provided at one end of the rack 9 was also reciprocated. There are machine stands 11A on each side of the weft insertion device.

11B, and as shown in FIG.
The weft insertion device 1 inserts the weft yarns in IA and 11B.
If the loom is to be woven with only one loom (hereinafter, such a loom will be referred to as a two-sided loom), the two-sided loom 11A.

There is a defect that the weft insertion time in 11B is different.

The reason for the defect will be explained with reference to FIG. 2, which is a simplified representation of the weft insertion device shown in FIG. 1.

Now, it is assumed that the weft insertion lengths of the weft yarns in the double-side tables 11A and 11B + are the same (this (the corresponding re-conveying body I OA,
10B), and the rotational position of the crank 2 corresponding to the weft insertion time Q on the machine base 11A is A1.
-A2 (rotation angle is θ1), and the rotational position of the machine base 11134 is B1-B2 (rotation angle is θ2), then the reciprocating distance of the weft conveyor 10A is 2rl, and the corresponding rotational angle of the crank 2. θ1 is smaller than the rotation angle θ2 of the crank 2 corresponding to the reciprocating distance 2r of the weft conveyor 10B.

That is, the reciprocating time of the weft conveyor 10A (weft insertion time)
is different from the reciprocating time (weft insertion time) of the weft conveyor 10B.

This fact means that the timing of inserting the weft in a two-sided loom may be incorrect.

The present invention has been made in consideration of the above facts, and its object is to provide a weft insertion device for a rapier loom that is simple in structure and easy to manufacture.

Hereinafter, a third embodiment of the present invention will be described.
To explain this based on Figures 5 to 5, the weaving operation of the machine base (the coupling 22 fixed with bolts 21 to the drive shaft 20 which is rotated at a constant speed in synchronization with the weaving operation) is connected to the swash plate cam 23. The swash plate cam 23 has a fitting protrusion 23b that protrudes obliquely to the cam surface 23a of the cam surface 23a. A rotationally adjustable ζ bolt 24 is fixed to the swash plate cam 23.As the swash plate cam 23 rotates, a pair of arms 25a4 are provided, and a rotor 26A is brought into contact with the cam surface 23aG of the swash plate cam 23.
, 26B, the swinging member 25 is supported via its output segment 25b and a support bar 27 that passes through the output segment 25b so as to be relatively rotatable, and a support bracket 2B that is connected to both ends of the bar 27. It is supported by a shaft 29.

Note that the axis C1 of the support shaft 29 is the axis C1 of the drive shaft 2°.
2 and the intersection point 0 of the coaxial core c2 and the cam surface 23a
It is set up so that it passes through. Also, both rotors 26A, 2
6B is provided so that its rotation center axis c3 intersects with the axis C2 and is perpendicular to the axis C1 when projected onto the cam surface 23a. Furthermore, both rotors 26A,
26B is distributed on both sides of the axis C1.

A driven gear 36 fixed to a shaft 3o is meshed with the output segment 25b, and a tape wheel 31 is fixed to the same shaft 3o. The porridge wheel 31 is provided with teeth 34 on its circumferential surface, and has a tip portion (each of which is a weft conveyor 32 .
Hole of carrier tape 35 to which 33 was fixed (path shown)
This is consistent with the above theory 34ζ. Note that the hole portion (the illustrated path) of the carrier tape 35 meshes with the tooth 34 .

The carrier tape may be formed of a rack as shown in FIG. 1, or two carrier tapes each having a weft conveyor 32 and 33 fixed thereto may be wound around the tape wheel 31 in opposite directions. When the tape wheel 31 is rotated back and forth, the carrier tape 35 is transferred to the re-conveying body 32.3.
3 are provided so that the wefts are inserted alternately in opposite directions. When the drive shaft 20 is rotated in synchronization with the weaving operation of the machine base, the swinging member 25 swings back and forth about the support shaft 29, or swings as shown in FIG. When the member 25 is swung as much as possible in the counterclockwise direction about the support shaft 29, the weft conveyor 33 is inserted the deepest, and the drive shaft 2o is in the state shown in FIG. from 18
00 rotations and the swinging member 25 swings clockwise to the maximum extent around the support shaft 29 as shown in FIG. ing.

Now, as shown in Figs.
If the weft insertion length of 3 is R, the time required for the reciprocating distance 2R of the weft transporter 32 (weft insertion time) is equal to the time required for the reciprocation distance 2R of the weft transporter 32 (weft insertion time). That is, unlike the conventional weft inserting device using a crank mechanism, the weft inserting device of the present invention using the swash plate cam 23 eliminates the possibility of the weft inserting timing being out of order even in hot weather when implemented in a two-sided R machine. do not have.

Further, both rotors 26A and 26B are on both sides of the swinging center of the swinging member 25, that is, the axis c1. Since the distribution is arranged, it can reliably follow the swash plate cam 23, and therefore,
The swinging member 25 can be reciprocated accurately. For general positive cams, the cam surface must be precisely formed, and therefore,
The cam surface 23a of the swash plate cam 23 may not be easy to manufacture.
Since it is flat, it is easier to manufacture than the two general positive cam saws. Furthermore, the mechanism for converting rotational motion into reciprocating motion via the swash plate cam 23 has the advantage of a simple configuration.

In this embodiment, the cam surface 2 of the swash plate cam 23 is
A fitting protrusion 23b is provided obliquely to the protrusion 23a.
Q and coupling 2 so that 3b intersects obliquely with the drive shaft 20.
The swash plate cam 23 is connected to the drive shaft 20 via 2, and the rotation can be adjusted with respect to the coupling 224. (On the other hand, the swinging angle of the swinging member 25 can be easily adjusted by simply adjusting the rotation of the swash plate cam 23 by the car number, and it is also possible to easily cope with changing the weave width of the woven fabric.) .

Further, in this embodiment, the axis C1 of the support shaft 29 passes through the intersection 0, but if this is done, both rotors 26
A t' 26 B has the advantage that no null load is applied in the direction of its central axis C3.

Note that the present invention is not limited to the above-mentioned embodiments (but is not limited thereto; for example, the swash plate cam 23 may be directly attached to the drive shaft 204 without using the coupling 22, or the swing plate cam 23 may be attached directly to the swing member 25).
It is possible to shift the axis C1, which is the center of oscillation of the Alternatively, even if the output segment 25b is omitted, the support shaft 29 may be made rotatable within the scope of the present invention, such as by fixing a gear that meshes with the driven gear 36 to the same shaft 29-. (It is also possible to embody this change optionally.)

As described in detail above, the present invention is characterized in that a weft conveyor for inserting weft yarns is connected to the output part of a reciprocating motion device that converts rotational motion into reciprocating motion via a swash plate cam. Therefore, the structure is simple and easy to manufacture, and it is suitable as a drive device for a weft conveying body in a rapier loom. In particular, when implemented in a two-sided loom, this has an excellent effect in that the phase of the reciprocating motion of the weft conveyor does not change.

[Brief explanation of drawings]

Figure 1 is a front view of a conventional weft insertion device, and Figure 2 is a front view of a conventional weft insertion device.
3 is a simplified front view, FIG. 3 is a plan view of essential parts showing an embodiment embodying the present invention, FIG. 4 is a sectional view taken along the line X-X of FIG. 3, and FIG. FIG. 6 is a front view showing a change from the state shown in FIG. Drive shaft 20, swash plate cam 23, swinging member 25, weft conveyor 32, 33° Patent applicant Toyota Industries Corporation Agent
Patent attorney Futonobu Onda

Claims (1)

[Scope of Claims] l In a rapier loom in which weft insertion is performed by a weft conveyor that reciprocates within a warp shedding, the weft conveyor is A weft insertion device for a rapier loom, characterized in that the bodies are connected. 2. The output section is an output segment provided on a swinging member that swings back and forth via a rotor in contact with the cam surface of the swash plate cam as the swash plate cam rotates.
The weft insertion device in the rapier loom described above.