JPH03124847A - Device for controlling tension of warp in loom - Google Patents

Abstract

PURPOSE:To prevent the occurrence of change in tension unnecessary to warp by setting so as not to produce torque by an inertial force of back roller around a support where a tension lever oscillates against a loom frame. CONSTITUTION:A tension lever 2A is installed freely oscillatory and a part (ef) from the support (f) till a coupling point (e) with a back roller arm 4A of back roller 5 and an easing connecting rod (bc) are set nearly in parallel. The insert angle between a part (de) on tension lever side where the back roller connecting point (d) of a back roller arm 4A is positioned as an apex and a part (dc) on easing connecting rod is set to nearly night angle. The device is free from partial force by inertical force of back roller.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a warp tension adjustment device for a loom.

Conventional warp tension adjustment devices for looms include a semi-active easing device that combines a so-called passive easing device that uses a biasing force to relieve warp strain during shedding, and a so-called positive easing device that uses an easing driving force to alleviate warp strain when shedding. What is called an easing device is known. This is the third
As shown in the figure, the tension lever 2 is attached to the loom frame 1.
is swingably attached. One end of an easing spring 3 serving as a biasing means is anchored to one end of the tension lever 2. The other end of this easing spring 3 is connected to the loom frame I via a tension sensor 8.
is moored to. This tension sensor 8 outputs an amount of electricity corresponding to the actual warp tension to a control device that controls the amount of warp beam delivery in a warp delivery device (not shown). Further, one end of a back roller arm 4 is rotatably connected to the other end of the tension lever 2. A back roller 5 is rotatably attached to an intermediate portion of the back roller arm 4, and one end of an easing connecting rod 6 is connected to the other end of the back roller arm 4. A crank 7a constituting an output portion of an easing drive source 7 mounted on the loom frame l is rotatably connected to the other end of the easing connecting rod 6. This crank 7a
is rotated around the connection point λ with the easing connecting rod 6 in conjunction with the shedding movement of a shedding device (not shown), so that the back roller 5 floatingly supported on the loom frame l connects the easing spring 3 and the easing connecting rod 6. By working together, the strain generated in the warp yarns Y at the time of shedding is alleviated.

Problems to be Solved by the Invention In the warp tension adjusting device using the semi-active easing device described above, the inertial force of the back roller 5 is applied to the easing spring 3, which causes strain in addition to the original action of mitigating warp strain. It has been pointed out that this has the adverse effect of causing the back roller 5 to move and causing unnecessary fluctuations in warp tension.

■In other words, the connection point between the crank 7a and the easing connecting rod 6 is denoted by the symbol C, the connection point between the easing connecting rod 6 and the back roller arm 4 is denoted by the symbol C, and the connection point of the back roller 5 to the back roller arm 4 is denoted by the symbol C. d, the fulcrum of the tension lever 2 is denoted by f, the connection point between the tension lever 2 and the easing spring 3 is denoted by g, and the vector corresponding to the inertial force of the pub crawler 5 is denoted by α.
shall be. An included angle 1cde between the easing connecting rod side portion cd and the tension lever side portion de, the apex of which is the connecting point d of the back roller arm 4 with the back roller 5, is set to be an obtuse angle. Further, the back roller arm side portion ef and the portion be of the easing connecting rod 6 are set to be non-parallel (ef→%bc) from the fulcrum f of the tension lever 2.

■Since the easing connecting rod 6 is rotatably supported at both ends, there is no input of torque component, and the connection point C
The force applied to is always in the direction along be.

■Also, since the back roller arm 4 is floatingly supported, that is, both ends are supported in the air, the connection point c,
The forces applied to d and e must intersect at one point, otherwise a torque component will be generated and the back roller arm 4 will rotate.

■Here, considering the above ■ and ■, vector α and be
It can be seen that the forces at connection points c, d, and e intersect at the intersection point 0 with .

■Therefore, draw a straight line Y from the connection point e toward the intersection point 0, move the starting point of the vector α to the intersection point 0, decompose this vector α into the directions of the straight lines Y and bc, and divide them into vectors β,
If γ, vector β is the force acting on the connection point e, which is the axis of the passive easing device.

(2) Also, if a perpendicular line is drawn from the fulcrum f to the straight line Y and its intersection is taken as a sign, a torque of vector β×n is generated around the fulcrum f, and the easing spring 3 is deflected. This is,
This is a state in which the easing spring 3 is affected by the inertial force of the positive easing device.

Means for Solving the Problems A first invention sets the back roller arm side portion ef and the easing connecting rod bc substantially parallel to each other from the fulcrum of the tension lever (ef/bc), and also sets the back roller arm side portion ef and the easing connecting rod bc substantially parallel to each other (ef/bc), and Tension lever side portion 77 and easing connecting rod side portion cd with
Set the included angle 1cde with approximately right angle ZR C1cde=lR
) has been done.

The second invention is such that an included angle 1efg between the back roller arm side part ef and the easing spring side part g with the fulcrum f of the tension lever at the apex is a vector α corresponding to the inertial force of the back roller and the easing connecting rod bc. The intersection point 0 is the back roller side part e of the tension lever.
Set at a predetermined angle θ to be located on the extension line from f (te
fg=θ).

Effect: In the first invention, no component force is generated due to the inertial force of the back roller.

In the second invention, no torque is generated around the fulcrum of the tension lever due to the component force generated by the inertial force of the back roller.

Embodiment First, an embodiment of the first invention will be described in detail by assigning the same reference numerals to the same parts as the conventional structure described in conjunction with FIG.

As shown in Figure 1, the tension rail/
<-2A is swingably attached.

One end of an easing spring 3 is anchored to one end of the tension lever 2A. The other end of the easing spring 3 is anchored to the loom frame 1 via a tension sensor 8. This tension sensor 8 outputs an amount of electricity corresponding to the actual warp tension to a control device that controls the amount of warp beam delivery in a warp delivery device (not shown).

Further, one end of a back roller arm 4A is rotatably connected to the other end of the tension lever 2A.

A back roller 5 is rotatably mounted on the intermediate portion of the back roller arm 4A, and one end of an easing connecting rod 6 is connected to the other end of the back roller arm 4A. A crank 7a constituting an output portion of an easing drive source 7 mounted on the loom frame I is rotatably connected to the other end of the easing connecting rod 6. As the crank 7a rotates about the connection point & with the easing connecting rod 6 in conjunction with the shedding movement of a shedding device (not shown), the back roller 5 floatingly supported on the loom frame l moves the easing spring 3 and the easing connecting rod. 6, it has a structure that alleviates the strain that occurs in the warp Y at the time of shedding.

Here, in order to simplify the explanation, the connection point between the crank 7a and the easing connecting rod 6 is designated by the symbol C, the connection point between the easing connecting rod 6 and the back roller arm 4A is designated by the symbol C, and the connection point between the crank 7a and the easing connecting rod 6 is designated by the symbol C. The connection point of the roller 5 is denoted by d, the fulcrum of the tension lever 2A is denoted by f, the connection point between the tension lever 2A and the easing spring 3 is denoted by g, and the vector corresponding to the inertial force of the back roller 5 is denoted by α. do.

Then, the back roller arm side portion from the fulcrum f of the tension lever 2A (the portion from the fulcrum f to the connection point e) ef
and easing connecting rod 6A (connection point C
(the part up to)■τ is set to be approximately parallel (ef//bc). In addition, a tension lever side portion (portion from connection point d to connection point e) 77 and an easing connecting rod side portion (portion from connection point d to connection point e) with the back roller arm 4A at the connection point d of the back roller 5 as the apex. ) Set the included angle 1cde with cd to approximately right angle ZR (Zcde=fR)
It has been done. As a result, the included angle Zde between the tension lever 2A and the back roller arm 4A with the connection point e as the apex is
f is also set to a right angle lR (ldef=lR).

According to this embodiment, due to the above-mentioned relationship, e 15 τ and zcds, no component force due to the inertial force of the back roller 5, that is, a vector β due to the vector α, is generated during the warp strain relaxation operation. Therefore, the fulcrum f
No torque is generated around it due to vector β. Therefore, the easing spring 3 is not deflected by the inertial force of the back roller 5.

Next, an embodiment of the second invention will be described in detail with reference to FIG. 2, in which the same parts as the embodiment structure of the first invention described above and the conventional structure described above are denoted by the same reference numerals.

As shown in FIG. 2, a tension lever 2B is swingably attached to the loom frame l.

One end of an easing spring 3 is anchored to one end of the tension lever 2B. The other end of the easing spring 3 is anchored to the loom frame 1 via a tension sensor 8. This tension sensor 8 outputs an amount of electricity corresponding to the actual warp tension to a control device that controls the amount of warp beam delivery in a warp delivery device (not shown). Further, one end of a back roller arm 4 is rotatably connected to the other end of the tension lever 2B.

A back roller 5 is provided in the middle part of this back roller arm 4.
is rotatably mounted, and one end of an easing connecting rod 6 is connected to the other end of the back roller arm 4. A crank 7a constituting an output portion of an easing drive source 7 mounted on the loom frame 1 is rotatably connected to the other end of the easing connecting rod 6. This crank 7a rotates around the connecting point a with the easing connecting rod 6 in conjunction with the shedding movement of a shedding device (not shown), thereby opening the loom frame! The structure is such that a back roller 5 supported floatingly works together with an easing spring 3 and an easing connecting rod 6 to alleviate the strain generated in the warp yarns Y at the time of shedding.

Here, in order to simplify the explanation as in the above-mentioned embodiment of the first invention, the connection point between the crank 7a and the easing connecting rod 6 will be referred to as the reference numeral, and the connection point between the easing connecting rod 6 and the bub crawler arm 4 will be referred to as the reference numeral. The connection point of the back roller 5 to the back roller arm 4 is designated as the symbol C, and the connection point of the back roller 5 to the back roller arm 4 is the symbol d.
The fulcrum of the tension lever 2B is denoted by f, the connection point between the tension lever 2B and the easing spring 3 is denoted by g, and the vector corresponding to the inertial force of the back roller 5 is denoted by α.

Then, the included angle Zefg between the back roller arm side part (the part from the fulcrum f to the connection point f) ef and the easing spring side part (from the fulcrum f to the connection point g) fg with the fulcrum f of the tension lever 2B as its apex is , the vector α corresponding to the inertial force of the back roller 5 and the easing connecting rod 6 (
The intersection point 0 with be (the part from the connection point S to the connection point C) is the extension line from the shoulder of the back roller side part of the tension lever 2B (the part from the connection point e to the fulcrum f) (the part between the fulcrum e and the connection point r). It is set at a predetermined angle θ to be positioned on the straight line passing through) Y.

According to this embodiment, since the intersection point 0 of the vectors α and bc is located on the straight line Y due to the above 1efg=θ, that is, the fulcrum f is located on the straight line Y, during the warp strain relaxation operation, The component force caused by the inertial force of the back roller 5, ie the vector α, produces a vector β, but βXO. Therefore, no torque is generated around the fulcrum f due to the vector β. Therefore, similarly to the above embodiment, the easing spring 3 is not deflected by the inertial force of the back roller 5.

Therefore, in the above two embodiments, the tension sensor 8 connected across the easing spring 3 and the loom frame I also receives electricity according to the true warp tension, which does not include the inertial force of the back roller 5. Amount can be output. In addition to the spring, an air spring or an electromagnetic actuator may be used as the biasing means.

Effects of the Invention As described above, according to the present invention, since the tension lever does not generate torque due to the inertial force of the back roller around the fulcrum on which it swings relative to the loom frame, the biasing means does not bend due to the inertial force. There is no. This has the advantage of not causing unnecessary tension fluctuations in the warp yarns.

[Brief explanation of the drawing]

FIG. 1 is a model diagram showing an embodiment of the first invention;
The figure is a model diagram showing an embodiment of the second invention, and FIG. 3 is a model diagram showing a conventional warp tension adjustment device for a loom. ■...Loom frame, 2.2A, 2B...Tension lever 3...Easing spring (biasing means)
, 4.4A... Back roller arm, 5... Back roller, 6... Easing connecting rod, 7... Easing drive source, 7a... Crank, α, β, γ...
Vector, a, b, c, d, e, g series of points, f...
・Fully point, h, o...intersection, Y...straight line (extension line). 1st

Claims (2)

[Claims] (1) A biasing means is moored to one end of a tension lever that is swingably attached to the loom frame via a fulcrum, and a back roller is attached to the other end of the tension lever in the middle. One end of the arm is rotatably connected, one end of an easing connecting rod is rotatably connected to the other end of this back roller arm, and the output part of the easing drive source is connected to the other end of the easing connecting rod. In the warp tension adjustment device of a loom, which is rotatably connected to the back roller arm side part (@ef@) and the easing connecting rod (@b
c@) are set almost parallel (@ef@/@bc@), and the tension lever side part (@de@) and the easing connecting rod side part (@de@) with the back roller connection point of the back roller arm as the apex are cd@) and the included angle (∠c
A warp tension adjustment device for a loom, characterized in that de) is set at a substantially right angle (∠R) (∠cde=∠R). (2) A biasing means is moored to one end of a tension lever that is swingably attached to the loom frame, and the other end of the tension lever is one end of a back roller arm with a back roller attached to the middle part. One end of the easing connecting rod is rotatably connected to the other end of this back roller arm, and the other end of the easing connecting rod is connected to an easing drive source mounted on the loom frame. In a loom warp tension adjustment device in which the output section of the loom is rotatably connected, the fulcrum of the tension lever (
The back roller arm side part with f) as the apex (@ef@
) and the biasing means side part (@fg@) (∠efg)
The intersection point (o) of the vector (α) corresponding to the inertial force of the back roller and the easing connecting rod (@bc@) is the back roller side portion of the tension lever (@ef@).
1. A warp tension adjustment device for a loom, characterized in that the device is set at a predetermined angle (θ) to be positioned on an extension line from .