JP3055480B2 - Thread tension detection sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread tension detecting sensor using a strain detecting element.

[0002]

2. Description of the Related Art Heretofore, as a yarn tension detecting sensor, there has been known a yarn tension detecting sensor having a base member distorted by a load, a distortion detecting element for detecting distortion, and a yarn guide as a load detecting point.

[0003]

In such a yarn tension detection sensor, the measurable range and accuracy of the yarn tension largely depend on the mechanical properties of the base member. The range in which the tension can be accurately measured has been limited. Therefore, there has been no sensor that can accurately measure a high tension to a low tension with one sensor.

[0004] The present invention has been made by focusing on such problems existing in the prior art. The challenge is
An object of the present invention is to provide a yarn tension detection sensor capable of accurately detecting the yarn tension even when the measurement range of the yarn tension changes.

[0005]

In order to solve the above-mentioned problems, in the invention according to the first aspect, the yarn tension detecting sensor is changed to a yarn guide which is a load detecting point and a distance between the yarn guide and the yarn guide.
A thread guide body configured by attaching members, a base member distorted by a load, and a
Load transmitting member for transmitting force to the base member, and a base portion
And a strain detection element that converts the amount of material strain into an electrical signal.
To make the thread guide body detachable from the load transmitting member,
Replace the thread guide body and change the distance between the thread guide and the base member.
By changing the separation, the measurable range of the yarn tension can be changed.

According to the second aspect of the present invention, the yarn guide body
Provide a joint with an external thread and load transfer
The material shall be provided with a female screw hole to be screwed into the male screw of the joint
This makes the thread guide body detachable from the load transmitting member.
It was done.

According to the third aspect of the invention, the yarn guide body is provided.
Is insertable and detachable with respect to the load transmitting member
Provided with a connecting portion . Further, in the invention described in claim 4, the yarn guide moving means for allowing the yarn guide to move forward and backward with respect to the base member, and a fixing member for fixing the yarn guide are provided.

Therefore, according to the first aspect of the present invention, the measurable range in which the yarn tension can be measured with high accuracy is variable, so that the measurable range can be changed regardless of whether the yarn tension is high or low. it can.

According to the first aspect of the present invention, when the distance between the yarn guide and the base member is changed, the amount of distortion of the base member with respect to the amount of yarn tension applied to the yarn guide by the leverage principle is increased. Can be changed. Therefore, by changing the distance, even if the measurement range of the yarn tension changes, the range in which the base member is distorted is within a certain range, that is, within the assurance range in which the force applied to the base member and the amount of distortion are in a proportional relationship. can do.

According to the fourth aspect of the present invention, the distance between the yarn guide and the base member is changed to an optimum distance according to the measurement range by moving the yarn guide.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A yarn tension detecting sensor 1 will be described with reference to the drawings. Reference numeral 1 denotes a yarn tension detection sensor, which includes a base member 2, a load transmitting member 3, and a yarn guide 4. Reference numeral 2 denotes a base member, which is mainly made of metal and is distorted by receiving a load (thread tension). The generated distortion is detected by a distortion detecting element 5. Reference numeral 3 denotes a load transmitting member, which is vertically supported by the base member 2. Reference numeral 4 denotes a yarn guide, which serves as a load detection point where the yarn tension is applied. 5 is a distortion detecting element,
The amount of distortion of the base member 2 is detected and converted into an electric signal.
Reference numeral 6 denotes a protective member. Even if a load (yarn tension) of a predetermined amount or more is applied to the yarn guide 4, the load transmitting member 3 comes into contact with the opening end of the protective member 6, and the base member 2 and the strain detecting element 5 are located. It is protected so that it does not distort more than a certain amount. Reference numeral 7 denotes a joining portion, which is provided on the distance changing member 8 of the yarn guide 4 and
Is a member projecting from the base member 2 including the distance changing member 8 and the thread guide 4 including a distance changing member 8. It can be regarded as 3. The distance changing member 8 is fixed to the thread guide 4 and is detachable from the load transmitting member 3. A plurality of yarn guides 4 having the distance changing members 8 having different lengths L2 of the distance changing members 8 are prepared, and can be replaced with the optimum ones according to the yarn tension measurement range.

The detection of the yarn tension will be described. When a yarn tension F is applied to the yarn guide 4, a force is transmitted from the yarn guide 4 to the base member 2 via the load transmitting member 3. Base member 2
Is F × L, where L is the distance from the base member 2 to the thread guide 4. This moment M causes distortion in the base member 2, and the distortion also distorts the distortion detecting element 5. The amount of distortion detected by the distortion detecting element 5 is converted into an electric signal and sent to a CPU (not shown).

If an excessive tension is applied to the thread guide 4, the load transmitting member 3 comes into contact with the opening end of the protective member 6 and does not move any further. The moment of force exceeding a certain level is not transmitted.
By providing the size of the opening end of the protective member 6 so that the strain detecting element 5 provided on the base member 2 is not broken, even if excessive tension is applied to the thread guide 4, the load transmitting member 3 is provided. The sensor contacts the opening end of the protection member 6 to protect the sensor.

In this sensor, a compensation range in which the moment M applied to the base member 2 and the distortion of the base member 2 are proportional is determined by the mechanical properties of the base member 2. The distance L from the base member 2 to the thread guide 4 (L = length L1 of the load transmitting member 3 + length L2 of the distance transmitting member + length L3 of the thread guide 4 to the load detection point) is defined as La.
At this time, assuming that the measurement range of the yarn tension F in which the yarn tension can be accurately measured is Fa to Fb, if the distance L is 2La, the yarn tension is Fa / 2 to Fb / 2, and the moment is set. M can be in the same range as in the case of the yarn tensions Fa to Fb (M = F × L = F / 2 × 2La). In this case, the measurable range of the yarn tension is Fa / 2 to Fb / 2. That is, by changing the distance L, the measurable range can be changed.

Changing the distance L has no merit in that the measurable range can be simply changed, and the sensitivity can also be changed in accordance with the distance L. That is, if the measurable range is halved, the error is halved. That is the advantage. For example, assuming that the error of the strain detecting element is 6 grams at 150 grams, the error when the measurement result indicates a value of 150 grams is ± 6 grams. here,
If the distance L is doubled, the measurable range can be changed to half the value, and the error is also halved. If the measurement result indicates a value of 75 grams, the error is ± 3 grams. If the measurement is performed as it is without changing the distance L, even if the measurement result indicates a value of 75 grams, the error is ± 6 grams, which is not very accurate.

That is, when measuring a large tension such as a thick thread, the distance L is measured to be short, and when measuring a small tension such as a thin thread, the distance L is measured to be long. It is possible to obtain the optimum measurable range of the yarn tension according to the type and thickness of the yarn.

The distance L between the base member 2 and the yarn guide 4 will be described below.
The method of changing is described. In the embodiment of the present invention,
With the length L1 of the load transmitting member 3 being constant, a distance changing member 8 is provided on the thread guide 4, and the distance changing member 8 is detachable from the load transmitting member 3. The load transmitting member 3 is a metal column, and the distance changing member 8 is also a metal column having the same diameter as the load transmitting member. In order to make the load transmitting member 3 and the distance changing member 8 detachable, a connecting portion 7 which is a cylindrical projection having a smaller diameter than the load transmitting member 3 is provided, and a male screw is formed in the connecting portion 7. Is provided with a female screw hole to be screwed into the joint 7. Assuming that the yarn guide 4, the distance changing member 8 and the joining portion 7 are a yarn guide body 10, a plurality of yarn guide bodies 10 having different lengths L2 of the distance changing member 8 are prepared, and the yarn guide body 10 is replaced. Change the distance L. That is, if the length L is the length L2 of the distance changing member 8 and the length of the thread guide 4 is L3 (fixed), the distance L is L1 + L2 + L3. By changing the length L2 of the distance changing member 8, the distance L changes. Become. In FIG. 2, the length L2 is represented by L2
The case of a and the case of L2b are illustrated.

If a plurality of thread guides 10 having different lengths L2 of the distance changing members 8 are prepared in accordance with the thickness and type of the thread to be used according to the thickness and type of the thread, the thread guide 10
By simply changing the length, it is possible to obtain a measurable range of the yarn tension according to the thickness and type of the yarn. That is, the measurement range of the yarn tension can be easily changed with a simple structure.

As another embodiment, as shown in FIG. 3, the leading end of the load transmitting member 3 is extended to make the thread guide 4 movable, and the leading end extension on the load transmitting member 3 is movable. The thread guide 4 is fixed at a predetermined position by providing a fixing means 9 for fixing the thread guide 4. The fixing means 9 is fixed to the load transmitting member 3 with the screw 10.
It is preferable that the set screw 10 be tightened when loosening and fixing. In order to change the distance between the yarn guide 4 and the base member 2, a fixing means 9 for fixing the yarn guide 4 is provided so that the distal end portion can be freely moved so as to advance and retreat on the load transmission member 3 whose extension is extended. This makes it possible to easily change the measurement range of the yarn tension with a simple structure.

Further, a thread groove is cut in the extension of the leading end of the load transmitting member 3 and the thread guide 4 is fixed by using the fixing means 9 as a nut.
May be movable so as to advance and retreat on the load transmitting member 3 whose distal end is extended. Instead of moving one thread guide 4, a plurality of thread guides 4 may be provided on the load transmitting member 3, and the distance L may be changed by selecting and using the thread guide 4. .

In the embodiment of the present invention, the tension measurement range is changed by moving the position of the yarn guide 4.
Moving the yarn guide 4 changes the yarn path. To prevent the yarn path from changing, use the yarn guide 4
The attachment position of the main body of the thread tension sensor 1 may be moved without changing the attachment position of the thread tension sensor 1.

Further, in the embodiment of the present invention, the load transmitting member 3 and the distance changing member 8 are cylindrical, but the present invention is not limited to the column, but may have other shapes, and the material is not limited to metal. Alternatively, a resin or a composite fiber material may be used. The joint 7 is formed with a male screw and is engaged with the load transmitting member 3 having a female screw.
It is also possible to use a plug-in type without forming a screw.

[0023]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, the yarn tension detecting sensor is connected to the yarn guide, which is the load detection point, and the yarn guide.
A thread guide body configured with a distance changing member, a base member distorted by a load , a thread guide supported by the base member,
A load transmitting member for transmitting a force applied to the base member to the base member ;
A distortion detecting element that converts the amount of distortion of the base member into an electric signal
The thread guide is attached to and detached from the load transmitting member.
The thread guide and the base member
By changing the distance between them, the measurable range of the thread tension can be changed by changing the measurable range of the thread tension. It can be handled by changing the measurable range whether it is high or low. As a result, it is possible to provide a yarn tension detection sensor that can accurately detect the yarn tension even when the measurement range of the yarn tension changes.

According to the first aspect of the present invention, the yarn thread
By changing the distance between the guide and the base member,
Since the force measurement range can be changed, the thread guide and
By changing the distance to the base member, the force applied to the base member and the amount of distortion become a compensation range in a proportional relationship, so that the yarn tension can be detected accurately even when the measurement range of the yarn tension changes. A yarn tension detection sensor can be provided.

According to the first aspect of the present invention, the yarn
Thread gages with different length changing members according to thickness and type
Prepare multiple guide bodies and replace the thread guide body
The thread tension can be measured according to the thickness and type of thread.
You can get a fence. That is, the measurement range can be easily changed with a simple structure. According to the fourth aspect of the present invention, the yarn guide is provided by providing the yarn guide moving means for allowing the yarn guide to move forward and backward with respect to the base member, and the fixing member for fixing the yarn guide. By changing the distance between the base member and the base member to an optimum distance according to the measurement range of the yarn tension, the measurement range of the yarn tension can be easily changed with a simple structure.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the embodiment of the present invention.

FIG. 3 is a sectional view of a main part of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thread tension detecting sensor 2 Base member 3 Load transmitting member 4 Thread guide (load detecting point) 5 Strain detecting element 8 Distance changing member 9 Fixing member F Thread tension

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01L 1/00 D01H 13/10 D01H 13/32 G01L 5/04 G01L 5/10

Claims (4)

(57) [Claims] A yarn guide as a load detection point and a yarn guide.
A thread guide body configured with a distance changing member, a base member distorted by a load , a thread guide supported by the base member,
A load transmitting member for transmitting a force applied to the base member to the base member ;
A distortion detecting element that converts the amount of distortion of the base member into an electric signal
The thread guide is attached to and detached from the load transmitting member.
The thread guide and the base member
A yarn tension detection sensor in which the measurable range of the yarn tension can be changed by changing the distance between . 2. The thread guide body is provided with a joint having an external thread.
And the load transmitting member is screwed into the male thread at the joint.
By providing a female screw hole to
The thread tension detecting sensor according to claim 1, wherein the thread guide body is detachable . 3. The thread guide body is inserted into a load transmitting member.
2. A plug-in type detachable joint portion.
3. The yarn tension detection sensor according to claim 1. 4. The yarn tension detecting sensor according to claim 1 , further comprising a yarn guide moving means for allowing the yarn guide to move forward and backward with respect to the base member, and a fixing member for fixing the yarn guide.