Overview of this article

On March 29, 2019, the All Japan Kendo Federation's official website announced,Revision of Kendo Match and Refereeing Rules"There was an announcement.

The purpose of this notice is to inform you of some changes to the rules regarding shinai and kendo equipment. Please make sure you understand the contents of this notice before making your kendo equipment selection. It is not widely known, but many shinai products on the market are "non-compliant." Therefore, care must be taken when selecting a shinai.

The key points are rule changes and precautions regarding the equipment used in official matches.
Since this is a rule for "official matches," it is not mentioned in regular training. I would like you to organize and understand this information.

In this article, we would like to supplement the information released by the All Japan Kendo Federation to make the content easier to understand, so we will refrain from expressing subjective opinions as much as possible.

Revisions regarding bamboo swords

The following are the latest rules for Shinai. The parts in red are the newly added and revised parts.

It mentions that the overall shape and shape processing (=cutting) have been clearly defined, and that standards for measuring the tip of the ``chikutou'' have been established.

In official tournaments, the bamboo swords will be weighed in based on these rules.

change point

Bylaws Article 2　Article 3 of the Rules (Bamboo Swords) is as follows:

1. The shinai must be made up of four pieces, and no foreign objects (other than the core inside the tip leather and pieces of the handle) may be placed inside.Pieces (quarters of bamboo) with large gaps between the pieces, or pieces that have been processed or altered in a way that significantly impairs safety, must not be used.The names of each part shall be as shown in Figure 2.

2. The standards for shinai are as shown in Tables 1 and 2. However, the length is the total length including accessories, and the weight does not include the tsuba (guard). The thickness is the minimum diameter of the tip of the leather.The diameter of the shinai (the diameter across the flats) and the diameter of the shinai (the smallest diameter of the shinai diagonally at 8.0 cm from the tip). The tip of the shinai is the thinnest part of the shinai, and the shinai becomes thicker from the tip towards the monouchi.

(Quoted from Article 2 of the All Japan Kendo Federation's Kendo Match and Refereeing Rules)

*Chikutou: refers to the four pieces of bamboo that are joined together by means of a chigiri (metal piece that joins the bamboo together). This refers to the so-called "bamboo only" without any accessories.
*Opposite side diameter: The diameter of the four sides of a bamboo sword when put together.
*Diagonal diameter: The diameter between the diagonals of the four pieces of the bamboo sword when put together.

<Face diameter and diagonal diameter>

History of the revision of the regulations

Issued by the All Japan Kendo Federation Special Subcommittee on the Safety of Bamboo Swords and Kendo EquipmentCommittee Statement on Revision of Match Refereeing Rules and Regulations Regarding Kendo Equipmentaccording to,

"In recent years, in order to improve the operability of bamboo swords in matches, etc.,Aiming to reduce perceived weight,The bamboo sword is shaved extremely thin from the tip to the striking part.We are looking forward to seeing so many examples of modifications.”

"These modifications make the shinai more likely to break, increasing the danger of kendo, and the All Japan Kendo Federation could not overlook them.Contrary to the laws of the swordThis has created serious problems not only in terms of safety but also in terms of the fairness of the game.

It is written.

Furthermore, in the conventional method of measuring only the tip, even if the tip of the shinai is made too thin,The thickness of the tip can be adjusted by changing the thickness of the tip leather.For,Measure the diagonal diameter of the tip (8 cm from the tip, not covered by the tip leather)We have also decided to hold this event.

Furthermore, "Is it enough if the part 8cm from the tip meets the regulations? What about the part 7.5cm or 8.5cm?

In response to public comments such as "Is it okay to make it thinner?"The tip is the thinnest part of the blade, and the blade gets thicker from the tip towards the blade.' and weighing will be determined visually.

There was also a point made that "there are loopholes, such as widening only the sides of the bamboo and reducing the thickness of the back," but the response to this was limited to "trusting the user's common sense regarding safety."

Examples of illegal bamboo swords

Here are some examples of bamboo swords that may have met the previous regulations but would be considered illegal under the revised regulations.

・A foreign object (clay or weight) is placed in the hand to make the tip relatively lighter.

・Pieces (quartered bamboo) with large gaps between the pieces

・A thinly shaved bamboo sword with a large tip that meets the regulations.

・The tip is thinner than the tip

Things to note when purchasing a bamboo sword

Although there is no comprehensive statistical data, the bamboo swords that are widely available, not just at specific shops such as BUSHIZO or other martial arts equipment stores, are not made in accordance with these regulations.

Shinai are mainly produced in factories in Indonesia and China and shipped to Japan, but the current situation is that these regulations do not extend to the production areas of Japanese manufacturers and factories.

Shinai come in a variety of shapes. Furthermore, there are individual differences, so even if the product is the same, it may not meet the regulations. Therefore, when purchasing, you must clearly tell the seller that you are looking for a shinai that meets the regulations.

★How to order a Shinai that complies with the "new regulations" from BUSHIZO

Before completing your order, there is a free-form field called "Other inquiries" on the page.

Over there,Please include a comment such as, "Please make sure it meets the standards of the new regulations."

*This may be difficult depending on the product, but we expect to be able to accommodate in most cases.

Click here to purchase BUSHIZO bamboo swords

About the future

Currently, popular bamboo sword products are not manufactured in accordance with the new regulations, and some people find it difficult to use when holding and swinging a bamboo sword that complies with the new regulations, even if it is a product of the same brand, due to the balance of the center of gravity.

In the future, it is likely that industry groups and manufacturers will move in line with the wishes of the All Japan Kendo Federation, so I think it will become easier to choose a bamboo sword than it is now.