JPH10110359A - Reed fixing apparatus for weaving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reed fixing apparatus extremely excellent in workability, capable of securely and automatically floating a wedge member even by the use of an elastic body weak in energizing force. SOLUTION: This reed fixing apparatus is equipped with a reed fixing groove 2 which is laid on the top of a reed holder 1 as a reed retainer and into which a reed is introduced, with a wedge-shaped wedge member 5 which is inserted between a side wall 3 of the reed fixing groove 2 and a reed 4 and fixes the reed 4 and with a bolt 6 which presses the wedge member 6 against the bottom side of the reed fixing groove 2 of the reed holder 1. A spring 7 as an energizing means is laid between the wedge member 5 and the bottom of the reed fixing groove 2. The wedge angle of the wedge member 5 is set to a value approximately twice the static friction angle of the contact face of the side wall. The wedge member 5 has a hollow state in a cross section in the longer direction along the reed and is made of a resin material provided with a hole through which a bolt is passed while being brought into contact with the hole as an elastic material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reed fixing device for a loom, and more particularly, to a device for improving workability when detaching a reed from a reed holder by changing the machine.

[0002]

2. Description of the Related Art In order to attach a reed to a reed holder (lead holder), the reed is generally fixed using a wedge effect so that the reed can be easily attached to and detached from the reed holder during a machine change operation or the like. As this kind, the technique described in Japanese Utility Model Laid-Open No. 57-143289 is known. This will be described with reference to FIG. 6. The reed fixing groove 52 extends along the longitudinal direction of the lead holder 51 which is a reed holder.
The reed fixing groove 52 is provided with a side wall 53 formed on a slope so that the cross section of the reed-fixing groove 52 becomes wider at the upper opening side. Then, a reed 54 is inserted into the reed fixing groove 52, and a wedge member 55 having a slope corresponding to the side wall 53 is inserted along a longitudinal side surface of the reed 54, and a wedge is fixed by a bolt 56 as fixing means. When the member 55 is pushed in, the reed 54 is fixed by the wedge effect of the slope. Further, a compression spring 57 is attached between the bottom surface of the wedge member 55 and a retainer attached in the middle of the bolt 56.
By loosening the bolt 56, the wedge member 55 is pushed up by the urging force of the spring 57.

Further, as disclosed in Japanese Utility Model Laid-Open Publication No. 57-143289, in addition to a bolt for tightening and fixing a wedge member to a lead holder, a bolt having a flange portion abutting on the bottom surface of the wedge member is formed. There is also known a technique in which a wedge member is pushed up and removed by using a jack-up bolt and loosening the jack-up bolt.

[0004]

However, according to the technique disclosed in Japanese Patent Application Laid-Open No. 57-143289, it is necessary to remove the tightening bolts and then push up the wedge members by jack-up bolts. The work is cumbersome and time consuming. Further, the wedge member is a long member fixed along the longitudinal direction of the lead holder. To securely fix the jack to the lead holder and jack up, a plurality of wedge members along the longitudinal direction, in particular, jack-ups at both ends. If bolts need to be provided and the jack-up bolts are not loosened evenly on both ends, the wedge member will be inclined in the longitudinal direction, bending stress will be generated on the jack-up bolts, and the jack-up bolts may stick and become unremovable. .

Further, as disclosed in Japanese Utility Model Laid-Open Publication No. 57-143289, a wedge member which is pushed up by a spring force has a wedge angle (the surface of the wedge member 55 which is in contact with the reed 54 and the side wall 53 of the lead holder 51 which is in contact with the wedge member 55). (The angle formed by the surface) is small, about 15 degrees, so that the wedge member normally used has a coefficient of static friction of about 0.
Since it is 3, it has been found that a large force of about 300 kg is actually required to push up the wedge member. Therefore, it is necessary to make the spring constant of the spring 57 extremely large.
At the time of mounting 5, a large tightening force is indispensable to compress the spring 57, which is an extremely large spring constant, and the workability deteriorates. In addition, the spring 57 that can be interposed in the narrow gap between the wedge member 55 and the retainer must be small, and the setting of the spring constant has a limit. At present, the spring cannot be reliably pushed up.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a reed fixing device which can reliably push up a wedge member even by using a biasing means having a weak biasing force, and has extremely good workability.

[0007]

SUMMARY OF THE INVENTION Therefore, the present invention provides a first method.
A reed fixing groove provided on the upper surface of the reed holding body for inserting a reed; a wedge-shaped wedge member inserted between a side wall of the reed fixing groove and the reed to fix the reed; What is claimed is: 1. A reed fixing device comprising fixing means for pressing against and fixing a bottom side of a fixing groove, wherein biasing means for urging the wedge member in a floating direction is interposed between the wedge member and the bottom of the reed fixing groove. In addition, the wedge angle X of the wedge member is set to a value substantially equal to twice the static friction angle Y of the contact surface with the side wall.

Secondly, the wedge member is characterized in that the longitudinal cross section along the reed is hollow.

Thirdly, the fixing means is a bolt, and the elastic body is a resin material formed with a hole through which the bolt comes in contact.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. In addition, the same reference numerals are given to the same members described as the related art, and the description is omitted. First, FIGS. 1A and 1B are sectional views showing an embodiment of the device according to the present invention. One embodiment of the present invention will be described with reference to FIG. 1. A reed fixing groove 2 for inserting a reed 4 is formed on an upper surface of a reed holder 1, which is a reed holder, and a side wall 3 of the reed fixing groove 2 and a reed 4 Between them, a wedge member 5 for fixing the reed 4 by a wedge effect is attached. In this embodiment, the wedge member 5 is formed of a single part having a length corresponding to the weave width, but may be provided in a plurality of parts in the weave width direction. The cross section of the wedge member 5 has a wedge shape, and in particular, its wedge angle X (wedge member 5
The angle between the surface in contact with the reed 4 and the surface in contact with the side wall 3 of the lead holder 1 is approximately equal to twice the static friction angle Y with the side wall 3, and the wedge member 5 is generally used frequently. In this case, the coefficient of static friction is about 0.3. Therefore, the wedge angle X that satisfies the condition for reliably extracting the wedge member 5 and increasing the pressing force (fixing force) on the reed 4 is calculated to be 27 degrees or less by a calculation described later.
It has been found that a range of about 36 degrees is preferable. FIG.
(A) shows a state in which the wedge member 5 is fixed to the lead holder 1 by screwing the bolt 6 into the screw hole 1 a and pushing the wedge member 5 into the bottom side of the groove 2. A spring 7 as an urging means is attached to the receiving seat 2a at the upper end, and the wedge angle X is set by loosening the bolt 6 as shown in FIG.
As shown in (1), the wedge member 5 can be lifted up by the spring 7 and floated, and can be held in that state.

The wedge member 5 has a bolt hole 5a through which the bolt 6 penetrates with play. Also, by forming the hollow portion 5b, weight reduction is achieved,
Even if the spring constant of the spring 7 is reduced, it can be surely pushed up. The wedge member 5
The plurality of bolt holes 5a and the threaded portions 1a of the lead holder 1 are formed at both ends in the longitudinal direction of the wedge member 5 and at regular intervals therebetween.

Next, the setting of the wedge angle X of the wedge member 5 will be described with reference to FIGS.
Considering the moment when the wedge member 5 is pulled out with reference to (a), the wedge member 5 has a vertical drag N1 from the reed 4.
And the static frictional force R1, and at the same time, the normal force N from the side wall 3
2 and the static frictional force R2. Then, the extraction force F, which is the force required for extraction, is given by F = (− N1 × sin
(X / 2) + R1 × cos (X / 2) + R2 × cos
It is represented by (X / 2) −N2 × sin (X / 2). Here, when the wedge member 5 is extracted, the wedge member 5 is extracted upward along the direction of the center line l, so that the forces on the left and right of the center line are equal, and therefore the following equation is obtained. F = −2 × N sin (X / 2) + 2 × R1 cos (X /
2) When the static friction coefficient is Z and the static friction angle is Y, R = Z
Since N = NtanY, F = 2 × NtanYcos (X / 2) −2 × Nsin
(X / 2). When rearranging this equation, F = (2 × N / COSY) × SIN (Y− (X / 2)) By this, if Y> X / 2, F = positive load If Y = X / 2, then If F = 0 Y <X / 2, F = negative load It can be understood from the above equation that if Y <= X / 2, the extraction force of the wedge member 5 can be extremely small. Next, referring to FIG. 3B, the pressing force N3 against the reed 4 when the wedge member 5 is pressed into the reed fixing groove 2 of the lead holder 1 by the pressing force F1 by the bolt 6 to fix and hold the reed 4 is: N3 = (F1 / 2) × sin (Y + X / 2) / cosY.

These conditions will be described with reference to the graph of FIG. First, the wedge member 5 is formed of an aluminum material, and considering the surface roughness, the static friction coefficient Z is Z = 0.24 to
0.32. In addition, the wedge member 5 by the bolt 6
Is set to 750 kgf. The static friction angle at this time is Y = 13.5 to 18 from Z = tanY, and the output F of the wedge member 5 is represented by the lines A and Y = 13.5 when Y = 13.5.
At 18.0, it is line B. Here, the condition for setting the extraction output of the wedge member 5 to 0 or less is X / 2 in the line A.
Is not less than 13.5, and X / 2 is 18.0 in the line B.
That is, Y <= X / 2.

On the other hand, when the wedge member 5 is fixed to the reed 4 by the bolt 6, the wedge member 5 is pushed into the reed fixing groove 2 of the lead holder 1 by the pressing force F1 by the bolt 6, and the reed 4 is fixed and held. Is N3 = (F1 / 2) × sin (Y + X / 2) / cosY, and the value is Z = 0.32 (friction angle Y = 18.0).
It becomes like the line C shown in the case of. As can be seen from this line C, the pressing force increases as the wedge angle X decreases,
This condition is the same for other friction coefficients, for example, Z = 0.24. Therefore, the wedge member 5 can be pulled out with an extremely small force, and the value at which the pressing force against the reed 4 is the highest is Y = X / 2 shown in FIG. 4, and as shown in FIG. = 13.5 to 18.0, that is, the wedge angle X is preferably about 27 degrees to 36 degrees.

In this embodiment, since the hollow portion 5b is formed in the wedge member 5, the weight can be reduced and the speed can be increased, and the spring 7 can be reliably pushed up even with a small urging force. It is.

As described above, in this embodiment, when the machine is changed, as shown in FIG. 3, an impact wrench (not shown) or the like is used.
When the bolt 6 is rotated in the loosening direction, the bolt 6 rises, and the force for pushing the wedge member 5 is lost. Then, the spring 7 pushes the wedge member 5 upward with a small force and floats. After that, replace the reed 4
The wedge member 5 is pushed in by screwing the bolt 6 with an impact wrench, and the reed 4 is fixed.

In the above embodiment, the case where the spring 7 is used as the urging means has been described. However, the present invention is not limited to this. For example, a resin material 20 such as rubber or urethane is used as shown in FIG. Abuts on the receiving seat 2a, and is formed in a cylindrical shape whose upper end reaches the bolt hole 5a of the wedge member 5.
a may be formed so as to penetrate while contacting. With this configuration, even if the bolt 6 is rotated at a high speed by the impact wrench and loosened vigorously, a braking force is applied to the screw portion 6a by contact with the resin material. As a result, the brake is applied to the place where the vehicle is going to rotate further, so that there is an effect that the vehicle does not fly out.

[0018]

As described above, according to the present invention, even if an elastic body having a weak urging force is used, the wedge member can be surely lifted up and automatically set in a floating state. Can be attached and detached extremely easily,
Work time can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory perspective view of FIG. 1;

FIG. 3 is an explanatory diagram for explaining the extraction output of the wedge member shown in FIG. 1 and the pressing force on the reed.

FIG. 4 is a graph showing a relationship between a wedge angle, a wedge member ejection force, and a pressing force on a reed.

FIG. 5 is a partially enlarged cross-sectional view showing another embodiment of the present invention.

FIG. 6 is a sectional view showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reed holder (reed holding body) 2 Reed fixing groove 3 Side wall 4 Reed 5 Wedge member 6 Bolt (fixing means) 7 Spring (biasing means)

Claims (3)

[Claims] A reed fixing groove provided on an upper surface of a reed holding body for inserting a reed; a wedge-shaped wedge member inserted between a side wall of the reed fixing groove and the reed to fix the reed; What is claimed is: 1. A reed fixing device comprising fixing means for pressing and fixing a wedge member against a bottom side of a reed fixing groove, wherein an urging member for urging the wedge member in a floating direction between the wedge member and the bottom of the reed fixing groove. A wedge member having a wedge angle X substantially equal to twice a static friction angle Y of a contact surface with the side wall, wherein the wedge member has a wedge angle X substantially equal to twice the static friction angle Y of the contact surface with the side wall. 2. The wedge member has a hollow cross section in the longitudinal direction along the reed.
2. A reed fixing device for a loom according to item 1. 3. The reed fixing device for a loom according to claim 1, wherein said fixing means is a bolt, and said urging means is a resin material formed with a hole through which said bolt contacts. apparatus.