JPH0373661B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shedding device for a loom for weaving a plain weave, which is the most basic weave of textiles.

A conventional opening device of this type includes one shown in FIG. 1, for example. To explain this, cranks 2 and 2' are attached to drive shafts 1 and 1' provided on the left and right frames of the loom, respectively.
Connecting rods 3, 3' have one end pivotally connected to these cranks 2, 2', and the other ends of the connecting rods 3, 3' are respectively pivotally connected to driven levers 5, 5' attached to the open shafts 4, 4'. 4' makes reciprocating angular movement. and,
By attaching opening levers 6, 6' to the opening shafts 4, 4', respectively, and connecting these opening levers 6, 6' to the heald frames 8, 8' via turnbuckles 7, 7', the heald frames 8, 8 ′ is moved up and down to perform an opening movement to form a shed.

However, in such a crank-type shedding device, the vertical movement of the heald frames 8, 8' has constant acceleration, so the shedding curve is close to a sine curve, which poses no problem when weaving filament fabrics. However, for fabrics such as spun fabrics, where texture and texture greatly affect the quality of the finished fabric, it is common practice to vary the opening amount of the upper and lower threads depending on the warp tension during beating. However, since this is not possible with the crank method, it is not suitable for weaving spun fabrics.

In particular, in recent years in the textile industry, there has been an increase in the use of spun looms to weave filament yarns or filament looms to weave spun yarns. In addition, it was necessary to be able to change the aperture curve and to be able to do this change easily and in a short period of time.

For this reason, some heald frames are made to perform shedding motion according to the profile of the shedding cams by using shedding cams equal to the number of heald frames.

However, such a cam-type shedding device has a structure in which one shedding cam is provided for one heald frame, so a loom that weaves a plain weave has at least two heald frames (usually 4), so it is necessary to have the same number of aperture cams.
Additionally, a mechanism was also required to transmit the movement of the shedding cam to the heald frame. For this reason, the manufacturing cost of the shedding device increases, and a large space is required to store the shedding device in the loom, which increases the size of the loom, which increases the installation area of the loom and reduces the number of looms installed per factory. This led to problems such as a decrease in production. Moreover, when adjusting the timing of the opening cams, adjustments must be made for the number of cams, which requires a long adjustment time and is cumbersome.

Therefore, in order to solve these conventional problems, there is an opening device proposed by the present applicant in Utility Application No. 56-21430, but even this device has a structure that requires at least two opening cams. Therefore, there was still room for improvement.

The present invention has been made in view of the current situation, and it is an object of the present invention to solve the conventional problems by providing a shedding device exclusively for flat tissue with an extremely simple structure consisting of a single shedding cam. A camshaft that rotates in conjunction with the loom, an opening cam attached to this camshaft, and two cam lever shafts that are parallel to the camshaft and are arranged at approximately symmetrical positions with respect to the camshaft and whose positions are fixed. , two cam levers are provided which are respectively attached to these cam lever shafts and abut on the aperture cam at substantially symmetrical positions and swing with the rotation of the aperture cam, and the swinging of these cam levers is transmitted through a transmission means, respectively. The heald frame is moved up and down by transmitting the signal to the heald frame via the heald frame. Furthermore, an opening amount adjusting mechanism for adjusting the opening amount is provided in the transmission means system.

Hereinafter, the present invention will be explained based on illustrated embodiments.

FIGS. 2 to 4 show an embodiment of the present invention, in which a pair of brackets 12a and 12b are fixed to the outer surface of a frame 11 of a loom with bolts 13 spaced apart at a constant interval. A hollow cam box 14 is fixed between these brackets 12a and 12b, and a bearing 16 is fixed in a hole 15 formed approximately at the center of both side plates of the cam box 14. A camshaft 18 is rotatably supported by this bearing 16 via a bush 17 such as an oilless bearing.

As shown in FIG. 4, an open cam 19 consisting of a matching cam is fixed in the middle of the camshaft 18, and a toothed pulley 20 fixed to one end of the camshaft 18 and a loom drive (not shown) are connected to the camshaft 18. A toothed belt (not shown) is wound between the camshaft 18 and the pulley, so that the camshaft 18 and the opening cam 19 are rotated as the main shaft of the loom rotates. Here, the camshaft 18 is set to rotate 1/2 per rotation of the main shaft of the loom.

Further, a pair of holes 21 are provided on both side plates of the cam box 14 at substantially symmetrical positions with respect to the axis of the cam shaft 18.
a, 21b are formed, and these holes 21
Cam lever shafts 23a and 23b are rotatably supported on a and 21b via bushes 22, respectively. L-shaped cam levers 24a, 24b are fixed to one ends of the cam lever shafts 23a, 23b inside the cam box 14, respectively, and cam followers 25a, 25b, 25c, 25d are rotatably attached to both ends of each of these cam levers 24a, 24b. is installed on. Here, cam follower 2
5a and 25d are in contact with one cam 19a of the aperture cam 19 at positions shifted by approximately 180 degrees, and cam followers 25b and 25c are contacted in positions shifted by approximately 180 degrees with respect to the other cam 19b. Furthermore, 19-
1 indicates the trajectory of the aperture cam 19 closest to the center;
19-2 indicates the center locus, and 19-3 indicates the outermost locus.

Further, links 26a and 2 are provided at the other ends of the cam lever shafts 23a and 23b outside the cam box 14, respectively.
6b is fixed, and these links 26a,
A link 28 is attached to the tip of 26b via a pin 27.
One ends of the links 28a and 28b are rotatably connected, and the other ends of the links 28a and 28b have links 30a and 30 fixed to opening shafts 29a and 29b, which will be described later.
The tip of b is rotatably connected via a pin 31. Grooves 32 are formed at the tips of the links 30a and 30b, and the pin 31 is inserted into these grooves 32 so that its position can be adjusted, and the pin 31 is fixed by tightening the bolt 33 at an appropriate position. Further, by adjusting the position of the pin 31, the stroke amount (the opening amount of the warp threads) of the heald frames 34a, 34b, which will be described later, is adjusted.
Therefore, the pin 31, the groove 32, and the bolt 33 constitute an opening amount adjustment mechanism.

The opening shafts 29a and 29b are connected to both frames 11 of the loom.
bearing 3 fixed to frame 11
5, each of which is rotatably supported. Also, opening levers 36a, 36b are fixed to the inner sides of the frame 11 of the opening shafts 29a, 29b, and rod ends 38a, 38b are rotatably connected to the tips of the opening levers 36a, 36b via pins 37. ing.

The rod ends 38a, 38b are connected to the other rod ends 40a, 40b via turnbuckles 39a, 39b, and heald frame brackets 42a, 42b are rotatably connected to these rod ends 40a, 40b via pins 41. There is. And these heald frame brackets 42
The lower ends of heald frames 34a and 34b are bolted to a and 42b, respectively. Here the link 2
6a, 26b, 28a, 28b, 30a, 30
b, opening levers 36a, 36b, turnbuckles 39a, 39b, etc. constitute transmission means 43a, 43b.

In addition, in FIG. 3, 44 is the pin 27, 31,
41 is an E-shaped retaining ring for preventing removal, and 45 is a lock nut. Further, 46 is a guide bracket fixed to both inner surfaces of the frame 11 for vertically guiding the heddle frames 34a and 34b attached to the groove 47, and 48 is a reed for beating the weft toward the fabric. It is.

The operation of such an opening device will be explained with reference to the essential parts of the opening cam shown in FIG. In this case, at the position of the opening cam 19 shown in FIG. 4, for example, the heald frame 34b connected to the cam lever 24a is in the upward movement position, and the heald frame 3 connected to the cam lever 24b is in the upward movement position.
Assume that 4a is in the lowered position.

When the shedding cam 19 is rotated counterclockwise in the figure as the loom rotates, the cam lever 24b follows the shedding cam 19 and gradually rotates the cam lever shaft 23b counterclockwise in the figure. Therefore,
Links 26b, 28b,
30b, opening shaft 29b, opening lever 36b, etc., the connected heald frame 34a moves upward while being guided by the groove 47 of the guide bracket 46.

On the other hand, since the cam lever 24a rotates clockwise in the drawing to rotate the cam lever shaft 23a clockwise, the heald frame 34b moves downward while being guided by the groove 47 of the guide bracket 46.

Then, when the opening cam 19 makes a half turn, the heald frames 34a and 34b reach the upward and downward movement positions, respectively, and in the next half turn, the heald frame 34b moves upward and the heald frame 34a moves downward. When the opening cam 19 rotates once, the heald frames 34a and 34b move by one stroke.

Therefore, according to this shedding device, the warp threads can be opened by moving the heald frames 34a and 34b up and down using one shedding cam 19, so that this device can be made to have a simple structure, and the heald frames can be opened with one device. can be operated.

Therefore, the manufacturing cost of the shedding device can be reduced, and the time required to adjust the warp shedding timing can be shortened. In addition, this shedding device can be compactly provided on one side of the frame of the loom to cause the shedding movement of the heald frame, thereby making it possible to downsize the loom. Therefore, the production amount of woven fabric per loom installation area (per factory) can be increased. moreover,
Since the shedding amount can be adjusted by adjusting the position of the pin 31 provided at the portion that transmits the shedding motion to the heald frames 34a and 34b, the adjustment work becomes easy and the shedding amount can be adjusted according to the type of fabric. Since it can be adjusted to the optimal amount, high-quality fabrics can be woven.

In the above embodiment, the case where there are two heald frames has been explained, but in the case where there are four heald frames, the opening levers 36a, 3
6b or by extending the tips of the cam lever shafts 49a, 49b and attaching rod ends 38a, 38 to the extended portions.
b, etc., to connect the heald frames to each other.

As explained above, the present invention has an opening cam attached to a camshaft that rotates in conjunction with the main shaft of a loom, and two cam lever shafts that are parallel to the camshaft and located approximately symmetrically with respect to the camshaft. A cam lever is attached to each, and the tips of these cam levers are brought into contact with the aperture cam at a position offset by approximately 180 degrees, and the cam lever is oscillated as the aperture cam rotates, and these oscillations are transmitted through a transmission means. Since the information is transmitted to each heald frame individually, it is possible to perform the shedding movement of multiple heald frames with one shedding cam.
Not only can the shedding device be made to have a simple structure and the manufacturing cost of the shedding device can be reduced, but also the loom itself can be downsized because it can be installed compactly on one frame of the loom.

Furthermore, since there is only one shedding cam, the timing adjustment of warp yarn shedding becomes easy, eliminating the troublesomeness of this work and shortening the adjustment time. Furthermore, since the transmission means system is provided with an opening amount adjustment mechanism, the adjustment operation of the opening amount is facilitated, and high-quality fabrics can be woven.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a shedding device of a conventional loom;
FIG. 2 is a plan view showing an embodiment of the present invention, FIG. 3 is a schematic view taken in the direction indicated by the - arrow in FIG. 2, and FIG. 4 is a schematic view taken in the direction indicated by the - arrow in FIG. 11...Frame, 14...Cambox, 1
8...Cam shaft, 19...Opening cam, 23a, 23
b...Cam lever shaft, 24a, 24b...Cam lever, 29a, 29b...Opening shaft, 34a, 34
b... Heald frame, 36a, 36b... Opening lever,
43a, 43b...Transmission means.

Claims (1)

[Claims] 1. A camshaft 18 that rotates in conjunction with the loom, an opening cam 19 attached to the camshaft 18, and a cam 19 that is parallel to the camshaft 18 and arranged substantially symmetrically with respect to the camshaft 18, and whose position is fixed. The two cam lever shafts 23a, 23b and these cam lever shafts 2
3a, 23b, respectively, two cam levers 24a, 24b that abut on the opening cam 19 at positions shifted by approximately 180 degrees and swing as the opening cam 19 rotates, and these cam levers 24a,
Transmission means 43a, 4 transmitting the swinging motion of the heald frame 24b to the heald frames 34a, 34b to move them up and down;
3b, and opening amount adjusting mechanisms 31, 32, which are provided in the transmission means 43a, 43b system and adjust the opening amount.
33. A shedding device for a loom comprising: