JP2725065B2 - Warp tension adjusting device for loom - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warp tension adjusting device for a weaving machine that draws a warp from a plurality of beams and weaves the same. Useful to use.

2. Description of the Related Art A conventional warp tension adjusting device of this type of loom is disclosed in Japanese Patent Application
As shown in the specification and the drawings, a plurality of beams are rotatably arranged on an annular support rotatably provided with respect to the frame, and a brake mechanism is attached to each of these beams. When the total tension of the warp of each beam exceeds a predetermined value due to winding of the woven fabric accompanying weaving, the brake mechanism releases the braking force, and each warp draws out the beam and rotates, thereby increasing the warp tension. The warp tension of each beam is kept within a certain range. Further, a compensator cam for guiding the warp is provided so that the length of the warp drawn from each beam hardly changes even when the support on which each beam is disposed rotates.

Problems to be Solved by the Invention As in the above-mentioned conventional apparatus, a loom in which the braking force of each brake mechanism is released by the tension of the warp of each beam and each beam is rotated by the tension of the warp to feed out the warp. Therefore, even if the warp length of each beam is compensated so as to be hardly changed by the compensator cam, due to the manufacturing error of each part of the loom, the change in sliding resistance of the warp, the warp error of the beam, etc. During weaving, the tension of the warp changes, creating a tension difference between each warp. As a result, a difference in tension occurs between the warps between the beams, the difference in tension between adjacent warps between adjacent beams becomes extremely large, and a large level difference in tension occurs between the warps, causing uneven weaving on the woven fabric. Thus, there is a problem that the quality of the woven fabric is deteriorated. Further, in the conventional apparatus, since each beam is fed out and rotated by the tension of the warp of each beam, the tension of the warp of each beam always fluctuates within a certain range, thereby deteriorating the quality of the woven fabric. There was also.

Means for Solving the Problems In order to solve the problems of the above-mentioned conventional device, the present invention arranges a plurality of beams around which a large number of warps are wound in a ring on a support, and draws out the warps from those beams. A weaving machine for weaving, comprising a feeding device for synchronizing and feeding each beam, and a tension pressure equilibrium device for applying the total tension of the warp for each beam to the fluid of the fluid pressure cylinder. A fluid pressure cylinder is connected so that fluid pressure is transmitted to each other, and a detecting device for detecting a change in the total tension of the warp of each beam, and the total tension of the warp becomes constant based on the detection value of the detecting device. And a control device for controlling the operation of the feeding device.

Embodiment FIGS. 6 and 7 show the triaxial weaving loom 1 with a part omitted. In this triaxial weaving loom 1, reference numeral 3 denotes a fixedly installed frame, which is formed by framing a support 4, an upper frame 5, and a lower frame 6. An end of an intermediate frame 7 is fixed to an intermediate portion of the height of each column 4, and a support arm 8 is fixed to the intermediate frame 7. As shown in FIG. 2, a bearing bracket 10 rotatably supporting a support roller 9 is mounted on the support arm 8.
And a bearing bracket 12 that rotatably supports the guide roller 11.

Reference numeral 16 denotes an annular support member rotatably mounted on the support roller 9 about a vertical axis.
The movement in the radial direction is restricted by this, and the motor is rotated in one direction at a predetermined speed by a known rotary drive mechanism (not shown). Multiple (8 in the drawing) on the support 16
The support bases 17 are fixed to the positions where they are equally divided. The support base 17 is composed of a pair of support plates 18 established on a support 16 and a support frame 19 fixed to the upper end thereof, and a beam support bearing 20 is fixed to the support plate 18 respectively. . A pair of corresponding bearings 20 rotatably support a beam shaft 21 a of the beam 21, and the beam 21 is disposed between adjacent supports 17. A chain wheel 22 is fixed to the beam shaft 21a as shown in FIG.

Next, reference numeral 23 denotes an annular thread guide ring fixed to the support frame 19 via a bracket (omitted by reference numeral), which is arranged concentrically with the axis of the support 17. Reference numeral 24 denotes a thread guide reed secured to the thread guide ring 23 via a bracket (not shown), and guides each warp a fed from each beam 21. Reference numeral 25 denotes a known triaxial weaving mechanism, which includes two rows of a large number of heddles 25a arranged as rows in the weft insertion direction, and each of the two rows of heddles 25a guides a warp a to form a shed. Each time the weft is inserted, each heddle 25a is sequentially moved in the same direction as the rotation direction of the support 17, and the end heddle 25a is moved to the other row. Reference numeral 26 denotes a known take-up roller rotatably supported by a frame (not shown) of a triaxial weaving mechanism 25, which is rotated in the direction of an arrow by a drive mechanism (not shown) so as to take up the woven fabric b. It is. Reference numeral 27 denotes a horizontal frame fixed to the upper frame 5, and a pair of suspension frames 28 is fixed to the horizontal frame. Reference numeral 30 denotes a holding body fixed to the lower end of the suspension frame 28 via a compensator cam described later, and 31 denotes a movable thread guide device disposed on the holding body 30, which is elongated and suspended in a known manner. A large number of thread guides 31a are rotated in the same direction by the chain in synchronization with the rotation of the hedle 25a. Reference numeral 32 denotes a compensator cam fixed to the lower end of the suspension frame 28, and guides each warp a drawn from each beam 21 and guided to the triaxial weaving mechanism 25 so that its length hardly changes. It is formed.

Next, FIG. 1 to FIG.
As shown in the figure, a tension adjusting device 33 for adjusting the tension of the warp a drawn from each beam 21 is provided.
Next, the tension adjusting device 33 will be described.

First, reference numeral 34 denotes a feeding device for synchronizing and feeding each beam 21 and rotating it, as shown in FIG. 1 and FIG. In this feeding device 34, reference numeral 35 denotes a rotating shaft supported by a bearing 36 attached to the support plate 18, and each rotating shaft 35
Is connected to the end of the adjacent rotary shaft 35 via a rotary joint 37. A sheave 38 is fixed to each rotating shaft 35 at a position corresponding to the sheave 22 of the beam 21. As shown in FIG. 3, the sheave 38, the sheave 22, and a tension attachment attached to a bracket (not shown). A chain 41 is suspended around a chain wheel 40. Reference numeral 42 denotes a pair of support plates fixed to the upper surface of the support 16, and reference numeral 43 denotes an L-shaped mounting bracket pivotally supported on the support plate 42 via a pivot 44 so as to be vertically swingable. A contact screw 45 is attached, and the head of the contact screw 45 is supported substantially horizontally by bringing the head of the contact screw 45 into contact with a receiving frame 46 fixedly provided between the support plates 42. Reference numeral 47 denotes a drive motor fixed to the side wall of the mounting bracket 43, a chain wheel 48 is fixed to the drive shaft 47a, and 49 is a speed reducer fixed to the lower wall of the mounting bracket 43, and its input shaft 49a and output. Wheels 50 and 51 are fixed to the shaft 49b, respectively. A chain 52 is suspended between the chain wheel 48 and the chain wheel 50, and is fixed to the chain wheel 51 and the rotating shaft 35.
A chain 54 is suspended between the shaft 53 and the shaft 53.

Next, reference numeral 55 shown in the right middle part of FIG. 1 denotes a tension-pressure equilibrium device which causes the total tension of the warp a of each beam 21 to act on the fluid of the fluid pressure cylinder, and is shown in FIGS. It is configured as follows. In this tension-pressure equilibrium device 55,
56 is a supporting arm attached to a pair of adjacent supporting frames 19, respectively.
Both ends of the support shaft 57 are rotatably supported. The lower portions of a pair of swing arms 58 are fixed near both ends of the support shaft 57, and a thread guide roller 59 is rotatably mounted at an intermediate portion of the support shaft 57. An end of another thread guide roller 60 is rotatably supported at the upper part of the pair of swing arms 5858. An operating arm 61 is integrally fastened to one end of the support shaft 57. A support bracket 62 is fixed to the one support arm 56, and a cylinder body 63a of a hydraulic cylinder 63 such as a hydraulic cylinder is attached to the support bracket 62 by a piston rod 63b.
Are fixed so as to face the operation arm 61. A receiving plate 64 is fixed to the end of the piston rod 63b, and a spring 65 is interposed between the receiving plate 64 and the operating arm 61. Reference numeral 66 denotes a stopper fixed to the support bracket 62. Has been accepted. The piston chamber 63 of each of the fluid pressure cylinders 63
A fluid such as oil is sealed in c as shown in FIG. 5, and the piston chambers 63c are connected to each other by a communication pipe 68. Accordingly, the total tension of the warp a of each beam 21 acts on the fluid in the piston chamber 63c of each fluid pressure cylinder 63 to be balanced, and these fluid pressures are transmitted to each other so that the total tension of the warp a of each beam 21 is obtained. The tension will be the same.

Next, reference numeral 70 shown at the upper right of FIG. 1 is a detecting device for detecting a change in the total tension of the warp a being unwound from each beam 21, and has a structure as shown in FIG. 1, FIG. 3, and FIG. Have been. In this detection device 70, reference numeral 71 denotes a fluid pressure cylinder in which a cylinder body 71a is fixed on a support 16 such that a piston rod 71b faces upward, and a fluid is sealed in a lower piston chamber 71c. The chamber 71c is connected to the communication pipe 68
Accordingly, the fluid communication is made with the piston chamber 63c of each fluid pressure cylinder 63. A receiving plate 72 is fixed to the distal end portion of the piston rod 71b, and a detected piece 73 is fixed to the receiving plate 72. 74
Reference numeral denotes a support bracket fixed to the support plate 18 so as to be positioned above the receiving plate 72. An adjusting screw 75 is attached to the supporting bracket, and a receiving plate 76 is fixed to a lower end portion of the adjusting screw 75. A spring 77 is interposed between the receiving plate 76 and the receiving plate 72. Two guide rods 78 are arranged in parallel between the receiving plate 76 and the support plate 16, and these guide rods 78 pass through the receiving plates 72 and 76 to prevent them from rotating. 79 is a support bracket fixed on the support 16, and 80 is fixed to the support bracket 79. In the displacement detector, the detection section faces the detected piece 73. The displacement detector 79 detects the position of the detected piece 73 and detects a change in the pressure of the fluid in the piston chamber 71c as an electric signal, and detects a change in the total tension of the warp a of each beam 21. Are transmitted to a control device (not shown). This control device is disposed on the support 16 or the frame 3 or the like, controls the rotation speed of the drive motor 47 of the feeding device 34 based on the detection value of the displacement detector 80, and is fed from each beam 21. The total tension of the warp a is always kept constant at a predetermined value set in advance. Since this control device can be easily implemented by a conventionally well-known electric control technique, a detailed description thereof will be omitted. In addition,
6 and 7, reference numeral 90 denotes a known dropper device.

In the above configuration, prior to the operation, a plurality of beams 21 around which a large number of warps a are wound are respectively supported on a pair of bearings 20 and disposed on the support 16. Also a chain wheel of each beam 21
The chain 41 is suspended around the chain wheel 38 on the rotating shaft 35 and the chain wheel 40.
To give the chain 41 tension. Next, each beam 21
After being drawn out of the warp a and guided by the yarn guide rollers 59, 60, the yarn guide reed 24, the yarn guide ring 23, the compensator cam 32, and the like are passed through the yarn insertion grooves of the respective droppers of the dropper device 90, as is well known. After being guided by the yarn guide 31a to each heddle 25a, it is guided to the winding roller 26, and a predetermined warp setting operation is performed.

In the above-described warp setting operation, when the warp a fed from each beam 21 is wound by the winding roller 26 and tension is applied to the warp a, each warp a of each beam 21 moves the yarn guide roller 60 to the second position by the total tension. In the drawing, the swing arms 58, 58 are swung in the same direction by pulling to the left, and as a result, the support shaft 57 rotates to swing the working arm 61, and the working arm 61 compresses the spring 65. The spring force of this spring 65 is
It acts on the fluid in the piston chamber 63c of the fluid pressure cylinder 63 via 63a. The swinging of the swing arms 58, 58 and the working arm 61 stops when the total tension of the warp a of the corresponding beam 21 and the pressure of the fluid in the fluid pressure cylinder 63 are equilibrated. A pressure corresponding to the total tension of the warp a of the corresponding beam 21 acts on the fluid. The pressure acting on the fluid in each of the hydraulic cylinders 63 is transmitted to the fluid in the other hydraulic cylinders 63 via the fluid in the communication pipe 68, so that the pressure of the fluid in each of the hydraulic cylinders 63 is the same. As a result, the respective total tensions of the warps a drawn from the respective beams 21 have the same magnitude. The pressure of the fluid in the fluid pressure cylinder 63 is transmitted to the fluid in the fluid pressure cylinder 71 of the detection device 70, and the piston rod 71b of the fluid pressure cylinder 71 applies a spring 77 via the receiving plate 72 to the spring force of the fluid pressure. Compress to a position that balances with thrust. The detected piece 73 is also raised by the rise of the receiving plate 72, and the position detector 80 detects the total tension of the warp a of each beam 21 by detecting the magnitude of the fluid pressure at that time. Therefore, a predetermined amount of tension is applied to the warp a based on the value detected by the position detector 80.

Next, when the operation of the triaxial weaving loom 1 is started in the above state, the heddle 25a of the triaxial weaving mechanism 25 guides the warp a, opens the shed and performs weft insertion to weave the woven fabric b. ,
The heddles 25a on both sides laterally move in opposite directions to rotate the guide portion of the warp a in one direction. In addition, the movable yarn guide device 31
The yarn guide 31a and the support 16 rotate synchronously in the rotational direction of the heddle 25a, and rotate the guide portions of the warp a drawn from each beam 21 in the same direction. Further, the winding roller 26 winds the woven fabric b and pulls the warp a drawn from each beam 21, and the total tension of the warp a of each warp group A moves each yarn guide roller 60 to the center side of the support 16. To pull. As a result, each thread guide roller 60 swings the swing arm 58 to swing the working arm 61, and the working arm 61 compresses the spring 65 to increase the pressure of the fluid in each fluid pressure cylinder 63. As described above, the pressure of the fluid in each of the hydraulic cylinders 63 is transmitted to the fluid in the other hydraulic cylinders 63, and the pressure of the fluid in each of the hydraulic cylinders 63 has the same magnitude and is discharged from each of the beams 21. The total tensions of the warps a are the same. During the weaving as described above, the total tension of the warp a unreeled from each beam 21 becomes the same, so that each adjacent beam 21
The difference in the tension of the warp a between the beams 21 is reduced, and weaving spots between the beams 21 can be eliminated. Further, the fluid pressure of the fluid pressure cylinder 63 is transmitted to the fluid of the fluid pressure cylinder 71 of the detection device 70 as described above, and the piston rod 71b
The spring 77 is moved (raised) to the equilibrium position via. Backing plate
The detected piece 73 rises due to the rise of 72, and the detected piece 73
Each beam is detected by the displacement detector 80 detecting
It is detected that the total tension of the warp a fed from 21 has increased. Then, when the position detector 80 detects the height position of the detection target piece 73 corresponding to the magnitude of the total tension of the warp a set in advance, the drive motor 47 of the feeding device 34 is operated by the detection signal and the motor is operated. The shaft 47a is rotated by a predetermined amount in the feeding direction. The rotation of this motor shaft 47a is
The rotation of the rotation shaft 35 is transmitted to each beam 21, and each beam 21 is rotated by a predetermined amount to rotate each warp a and reduce the total tension of each warp a. Let it. By repeating the above operation, each beam 21
The total tension of the warp a fed from the yarn is always kept at a predetermined value during weaving. Therefore, the warp a
Can be woven with the total tension of the woven fabric kept constant, and weaving of the woven fabric can be prevented.

Further, the warp a of the warp group A pulled out from each beam 21 in association with the above-described weaving is turned in the turning direction of the support 16, and at that time, the length of each warp a is hardly changed by the compensator cam 32. However, the warp tension fluctuates to some extent during weaving due to a manufacturing error of each part of the triaxial weaving loom 2, a change in sliding resistance of the warp a, a warping error of the beam, and the like. A slight difference in tension is caused between them, and the total tension of the warp a of each beam 21 tends to fluctuate. However, the total tension of the warp a of each of the beams 21 is adjusted to the same size by the tension-pressure equilibrium device 55, so that weaving spots between the beams 21 can be prevented at all times during weaving.

In the above embodiment, the pressure is detected by a combination of the fluid pressure cylinder 71, the spring 77, and the displacement detector 80, but the pressure is directly detected by a pressure sensor or the like, or the displacement of the operating arm 61 by a displacement sensor or the like. May be directly detected.

Effect of the Invention As described above, in the present invention, the total tension of the warp for each beam is applied to the fluid of each hydraulic cylinder, and the fluid pressure of each hydraulic cylinder is transmitted to each other to have the same size. Therefore, the total tension of the warp between the beams can be made the same, the tension difference of the warp between the adjacent beams can be reduced, and the weaving unevenness between the beams can be prevented. In addition, the total warp tension of each beam is detected, and the payout speed of the beam is controlled based on the detected value so that the total tension becomes constant. The total tension of the warp of each beam is always kept constant. This has the effect of preventing uneven weaving due to fluctuations in the tension of the warp and improving the quality of the woven fabric.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention, FIG. 1 is a plan view showing a warp tension adjusting device of a loom with a part thereof omitted, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 4 is a sectional view taken along the line III-III of FIG. 1, FIG. 4 is a view taken in the direction of arrow IV, FIG. 5 is an explanatory view of the warp tension adjusting device, and FIG. FIG. 7 is a plan view of the shaft weaving loom, and FIG. 7 is a sectional view taken along the line VII-VII of FIG. a ... warp, 1 ... triaxial weaving loom, 16 ... support, 21 ...
… Beam, 34… Extension device, 55… tension and pressure equilibrium device, 63… fluid pressure cylinder, 68… communication pipe, 70… detection device.

Claims (1)

(57) [Claims] 1. A weaving machine for arranging a plurality of beams around which a number of warps are wound in a ring on a support, drawing out the warps from the beams, and weaving the beams in synchronism with the beams. And a tension pressure equilibrium device for applying the total tension of the warp for each beam to the fluid of the hydraulic cylinder, and connecting the hydraulic cylinders of the tension pressure equilibrium device so that the fluid pressures communicate with each other; A detecting device for detecting a change in the total tension of the warp of each beam;
A warp tension adjusting device for a loom, comprising a control device for controlling the operation of a feeding device so that the total tension of the warp becomes constant based on the detection value of the detecting device.