JP3203481U - Thread tension measuring instrument - Google Patents

Abstract

A measuring instrument capable of measuring the tension of each kite after tightening is provided. A hanging balance 41, and an angle 45 having an L-shaped cross section in which one end of a long side is fixed to a side surface of the hanging balance and a short side is disposed between a kite string and a heel of a kite. The tension of the kite string is measured by pulling the kite string with a hanging hook 44 provided on the lower side of the hanging balance. [Selection] Figure 4

Description

  The present invention relates to a thread tension measuring device for measuring the tension of the thread.

Fig.1 (a) is an external appearance perspective view of the cage | basket 10, FIG.1 (b) is a bottom view of Fig.1 (a).
The kite 10 can be played by the kite thread 15 being stretched with a predetermined tension by the cloud angle 12, the dragon horn 13, and the column 14 of the kite body 11. Yes. In the figure, 11a is called Ryuo, and 11b is called Ryuto. The surface 11c on which the silk thread 15 is stretched is called an instep, and the back surface 11d is called a long belly or a back plate.
On the long belly 11d, sound holes 16 and 17 which are sound outlets are formed. 18 is called Ryushu or Nekoashi. 11g is called dragon tongue.
Through holes for passing the kite thread are formed in the vicinity of the cloud angle 12 and the dragon angle 13, and thread tightening is performed through these through holes using a loader (for example, Non-Patent Document 1, 2).

http://www.nissindirect.com/cg/unpan/ea988xb-5.jpg http://www.nissindirect.com/cg/unpan/ea982bb-15.jpg

  Here, the general ridge 10 is curved in a convex shape in the length direction and the width direction, and in this embodiment, the case of a general ridge having a length of about 200 cm will be described. However, the present invention is not limited to this, and includes a flat plate-like body like Taisho.

FIG. 2 is an external perspective view showing a state in which the rod column 14 and the string 15 are removed from the rod 10 shown in FIG.
A rectangular tail silk (Oginu) 19 is attached to the dragon tail 11a to prevent the heel body 11 from being damaged by the tension of the cocoon thread 15.

3A is a plan view showing a state in the middle of thread tightening, FIG. 3B is a bottom view of FIG. 3A, and FIG. 3C is a plan view of FIG. It is side surface sectional drawing.
The ball 21 is connected to one end (right end in the figure) of the kite string 15, and the other end of the kite string 15 is passed through the through hole 11e formed in the vicinity of the dragon head 11b of the kite body 11 from the sound hole 17 formed in the long belly 11d. At this time, in order to protect the kite string 15, it is preferable to cover the kite string 15 with a cloth 30 indicated by a broken line and use the kite string scissors wooden jig 26. The other end of the silk thread 15 is passed through the groove of the dragon horn 13, the upper 11c, the groove of the cloud angle 12, the through hole 11f formed in the vicinity of the cloud angle 12, the sound hole 16, and the tail silk 19, and again the cloud angle 12 Is attached to one end of the scale 22 through the groove. A loader 23 and a rope 24 are attached to the other end of the scale 22, and a hook 25 attached to the rope 24 is hooked to the sound hole 24 through the dragon tongue 11 g of the copy 11.

The string 15 is tightened by the loader 23 so that a predetermined tension, for example, 20 kg weight (= 19.6 N) is applied to the string 15.
When a predetermined tension is applied to the kite thread 15, knots 15a are made one by one on the kite string 15 on the side of the dragon tail 11a, and the slack portion where the kite string 15a is pulled is pulled back and tied. When the tightening of all the bobbin threads 15 is completed, the attachment of the bobbin thread 15 is completed by removing the balance 22, the rope 24, the hooks 25, and the thread string scissors wooden jig 26.

However, the tension can be measured by attaching the balance 22 in the middle of the kite thread 15 during the thread tightening, but by pulling the slack part where the kite thread 15a is pulled, the cloud angle 12 and the dragon horn 13 are connected. The tension of the thread 15 in between changes. As for the tension after this change, the balance 22 determines the resultant force of the kite thread 15 between the loop side thread 15 and the cloud angle 12 and the dragon horn 13 formed from the front to the back of the dragon tail 11a of the kite body 11. As a result, the tension of the kite string 15 between the cloud angle 12 and the dragon horn 13 cannot be measured. In addition, since the balance 22 is removed from the kite body 11 together with the rope 24, the tension of the kite thread 15 between the cloud angle 12 and the dragon horn 13 cannot be measured after the scale 22 is removed from the kite string 15. There was no method for directly measuring the tension of the kite after tightening.
Therefore, an object of the present invention is to directly measure the tension of each kite string during and after the thread tightening.

  In order to achieve such an object, the invention according to claim 1 is characterized in that the hanging balance, one end of the long side is fixed to the side surface of the hanging balance, and the short side is disposed between the kite string and the upper of the kite. An angle having an L-shaped cross section, and the tension of the kite string is measured by pulling the kite string with a hook of the hanging scale provided on the lower side of the hanging scale.

  According to the present invention, it is possible to provide a kite tension measuring device that directly measures the tension of each kite string during and after the string tightening.

(A) is an external appearance perspective view of the cage | basket 10, (b) is a bottom view of (a). It is an external appearance perspective view which shows the state which removed the collar pillar 14 and the string 15 from the collar 10 shown in FIG. (A) is a top view which shows the state in the middle of thread | yarn tightening, (b) is a bottom view of (a), (c) is side sectional drawing of (a). (A) is a front view of the thread tension measuring device based on this invention, (b) is a side view of (a). (A) is a figure which shows the state which measures the tension | tensile_strength of the kite string 15 using the kite string tension measuring device 40 shown to Fig.4 (a), (b), (b) was shown to (a). FIG. 10 is an explanatory diagram when a vector analysis is performed on the contact point between the kite string 15 and the hook 44.

  Fig.4 (a) is a front view of the thread tension measuring device based on this invention, FIG.4 (b) is a side view of Fig.4 (a).

<Configuration>
The thread tension measuring device 40 shown in FIGS. 4 (a) and 4 (b) has, for example, a digital hanging balance 41 and an L-shaped cross section in which one end of a long side 45a is fixed to the side surface of the hanging balance 41. It is composed of 45 angles.
The hanging balance 41 is a commercially available hanging balance having a digital display unit 42 for hanging a bag or the like, a power switch 43, and a hook 44.
On the bottom surface of the short side 45b of the angle 45, a resin layer 46 is provided on the surface in contact with the upper 11c of the bag 10. Examples of the resin layer 46 include silicone rubber of about several millimeters, polystyrene, and the like.
The distance h from the bottom surface of the resin layer 46 to the lowest point inside the bent portion of the hook 44 is preferably equal to the height 60 mm of the column 14. It should be noted that the thickness of the resin layer 46 is considered to be within an error range during measurement.

<Action>
FIGS. 5A and 5B are views showing a state in which the tension of the kite thread 15 is measured using the kite tension measuring device 40 shown in FIGS. 4A and 4B. FIG. These are explanatory drawings in the case of performing vector analysis on the contact point between the kite string 15 and the hook 44 shown in FIG.
The kite tension measuring device 40 is arranged between the upper 11c and the kite 15 of the kite 10 shown in FIG. 5A so that the resin layer 46 is in contact with the kite 11c, and the kite 15 is hooked on the hook 44. By hooking the kite thread 15 on the hook 44, it becomes almost the same as the state where the kite column 14 is inserted. As an example, 3065 g (= 30.037 N) is displayed on the display unit 42 of the kite tension measuring device 40.

Here, the pulling force by the suspension balance 41 shown in FIG. 5B is F1, the tension on the dragon horn 13 side of the kite string 15 is F2, the tension on the cloud angle 12 side is F3, and the hook 44 of the suspension balance 41 is used. The angle between the heel angle 15 of the dragon horn 13 and the heel angle 15 of the cloud angle 12 is θ2, and the height from the upper 11c to the contact point of the hook 44 of the hanging scale 41 with the hook 15 Where h1 is the length of the perpendicular from the apex of Instep 11c due to the curvature of Instep 11c to the straight line connecting Dragon Angle 13 and Cloud Angle 12 and h2 is the formula of the action-reaction law (Newton's third law) (1) is established.
F1 ＝ F2 × sinθ1 + F3 × sinθ2 (1)
For example, if the length from the dragon horn 13 to the cloud angle 12 of the heel 10 is L, and the height from the upper 11c to the cocoon thread 15 is h1, the cocoon thread tension measuring instrument 40 at the center of the heel 10 In the case of measurement, θ1 = θ2 and F2 = F3, so Equation (2) is established.

tanθ1 = (h1 + h2) / (L / 2)
= 2 x (h1 + h2) / L (2)
Substituting h1 (for example, 6 cm), h2 (for example, 1 cm) and L (for example, 180 cm) into Equation (2), θ1 is obtained.
θ1 = arctan (7cm / 90cm)
= 0.077rad (= 4.44 degrees)
It becomes.

Also, since θ1 is a minute angle, it can be regarded as sin θ1≈θ1 by Macrolin expansion.
Therefore, Formula (1) can be expressed by Formula (3).
F1 ＝ F2 × sinθ1 + F2 × sinθ1
= 2 × F2 sinθ1 (3)

Therefore,
F1 = 2 × F2 θ1, and Equation (4) is established.
F2 = F1 / (2 × θ1) (4)
By substituting a numerical value into this equation (4), the tension of the kite string 15 can be obtained.
For example, substituting 3.065 kg for F1 and 0.077 for θ1, F2 becomes
F2 = 3.065 (kg weight) / (2 x 0.077)
= 19.90kg weight (= 195.05N).
When the kite string 15 was pulled by the closing machine 23, the weight was 20.00 kg (= 196.00 N), but it was changed by loosening or tightening the kite string 15 for adjustment.

  Here, a calculation function is provided in the hanging scale 41, and when the length L of the kite string 15 between the dragon horn 13 and the cloud angle 12 and the h1 which is the height of the pole column 14 are input, an angle θ1 (= arctan ( 2 (h1 + h2) / L)) may be calculated to convert the traction force F1 of the hanging balance 41 into a tension. In this case, it is necessary to provide a separate conversion switch and switches such as a numeric keypad. However, if the length from the dragon horn 13 to the cloud angle 21 and the height of the pole is set in advance, As shown in FIG. 5, only one power switch 43 is required as indicated by “ON → traction force → tension → OFF → ON”.

By playing 筝 10, the tension of the cocoon thread 15 gradually decreases due to secular changes and usage conditions. By measuring the tension of the cocoon thread 15 with the cocoon thread tension measuring device 40 each time, the replacement timing of the cocoon thread 15 is known. be able to.
The tension of the kite string 15 is preferably measured at the center position of the kite string 15 between the dragon horn 13 and the cloud angle 12.

  In addition, although the said embodiment is a suitable specific example in this invention, and there may be a technically preferable various limitation, the technical scope of this invention does not have description which limits this invention in particular. As long as it is not limited to these embodiments. Moreover, the component in the said embodiment can be replaced with the existing component etc. suitably, and various variations including the combination with another existing component are possible. Therefore, the description of the above-described embodiment does not limit the content of the device described in the scope of the utility model registration request. For example, in the above-described embodiment, the case of using a digital suspension scale has been described. However, the present invention is not limited to this, and an analog suspension scale may be used. In the above-described embodiment, the resin layer is used. However, the present invention is not limited to this, and the resin layer may be omitted. In the above-described embodiment, the case of a thirteen-stringed kite has been described. However, a case of a seventeen-stringed kite may be used, and a column that does not use a pole like the Taisho koto, Even so, it is applicable. However, when the main body is flat, h2 in the above formula (2) is not 1 cm, and is −1 cm when the height from the instep to the string is 1 cm.

10 １１ 11 筝 body 11a dragon tail 11b dragon head 11c shell 11d dragon belly 11e, 11f through hole 11g dragon tongue 12 cloud horn 13 dragon horn 14 stilt pillar 15 string 16, 17 sound hole 18 dragon hand (cat leg)
22 Scale 23 Clamping Machine 26 Thread Scissors Wooden Jig 40 Thread Tension Measuring Instrument 41 Hanging Scale 42 Display Unit 43 Power Switch 44 Hook 45 Angle 46 Resin Layer

Claims (4)

  A suspension scale, and an angle with an L-shaped cross section in which one end of the long side is fixed to the side surface of the suspension scale and the short side is disposed between the kite string and the back of the kite, A kite tension measuring instrument, wherein the kite string tension is measured by pulling the kite string with a hook of the suspension scale provided on the side.   The pulling force F1 when pulling the kite thread, the tension on the crown side of the kite thread is F2, the string length L from the dragon horn to the cloud angle of the kite and the height h of the kite column, Provided a switch for conversion and display using the formula θ1 = arctan (2 h / L) and the formula F2 = F1 / (2 θ1), where θ1 is the angle of the silk thread on the side of the crown when viewed from the hook The thread tension measuring instrument according to claim 1.   The thread tension measuring instrument according to claim 1, wherein a distance between the hook and the upper is equal to a height of the saddle pillar.   The thread tension measuring instrument according to claim 1, wherein a resin layer is provided on a bottom surface of the short side of the angle on a surface in contact with the back of the heel.

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