Reversed Blade (Gyakuba)
Edge typesKeep the edge term attached to geometry and service
An edge label becomes useful only when its maker wording, host blade, finish, and service route are known. Apply to Reversed Blade (Gyakuba)
- 01 Record the term Preserve the exact maker and model wording.
- 02 Locate the edge Identify the blade half, section, line, and any serration.
- 03 Trace its condition Keep sharpening, damage, coating, and inspection history.
- 04 Choose service Ask how the provider will preserve the original geometry.
Do not inferPolish, shine, feel, or a marketing label cannot diagnose an edge geometry or authorise a sharpening method.
Reversed belongs on orientation—not edge geometry
The supported field is which thinning-shear blade moves. It does not determine tooth form, removal rate, line, or grind.
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01 Side / plan view Open field
Blade line
Reversed orientation does not define a heel-to-tip blade line.
Leave openLine, width, curve, and transition remain open.
This route does not settle the field; record it separately.
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02 End-on slice Open field
Cross-section
Orientation does not reveal either blade's end-on section.
Leave openToothed and cutting-blade sections, clearance, and inner relief remain open.
This route does not settle the field; record it separately.
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03 Magnified working edge Open field
Edge / grind
The partner cutting edge and tooth-tip geometry need separate records.
Leave openGrind, finish, tooth profile, grooves, condition, and service construction remain open.
This route does not settle the field; record it separately.
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04 Declared axis + view Not geometry
Spatial curve
The route records toothed-blade versus cutting-blade moving-side orientation.
Leave openHandedness, reversibility, view direction, and exact assembly remain model-specific.
This is a product, orientation, or claim field rather than a shape specification.
Description
Gyakuba (逆刃) describes a thinning-shear orientation in which the comb or toothed blade is on the moving side. Orientation alone does not determine lift, feed direction, cut rate, finish, technique, or user group.
Gyakuba (逆刃) describes blade orientation in a single-comb thinning shear: the comb or toothed blade is on the moving side, while the continuous cutting edge is on the static side. It is not, by itself, a cutting mechanism, finish rating, or technique prescription across brands.
Standard and Reverse Are Positions
| Orientation | Moving side | Static side | Still unknown from orientation |
|---|---|---|---|
| Standard / 正刃 | Continuous-edge blade | Comb or toothed blade | Rate, feed, finish, tooth geometry, and intended technique |
| Reverse / 逆刃 | Comb or toothed blade | Continuous-edge blade | Rate, feed, finish, tooth geometry, and intended technique |
The construction should be confirmed from a maker diagram or explicit blade-pair specification. An even handle, a reversible listing, a product nickname, or a reseller photograph is not enough to assign orientation.
What Current Product Pages Show
- Hikari defines standard and reverse by which blade moves in its thinning-shear selection guide.
- Naruto uses
Sfor its static-comb layout andBfor its moving-comb layout. Those are Naruto house codes, not an industry key. - Joewell JCT-40G is a named reverse model that Joewell lists for fade and blurring work with a model-specific tooth count and approximate rate.
- Mizutani Schorem Master Blender is a named moving-comb model that Mizutani positions for nape refinement and scissor-over-comb, again with its own tooth and rate specification.
- KASHO uses A/B position icons in its catalogue. Those icons must be read as KASHO defines them rather than converted automatically to Naruto’s S/B system or another brand’s standard/reverse labels.
These examples verify that reverse variants exist and that makers assign uses to particular products. They do not prove a universal feed or lift mechanism, seamless fade result, or barber-only workflow.
Variables to Check Separately
Before comparing two reverse thinners, record:
- tooth count, width, spacing, grooves, and tip profile;
- maker-published cut rate and the absence or presence of a test method;
- blade length, clearance, tension, and edge condition;
- handedness and whether the model is explicitly reversible;
- the maker’s named motion and intended section; and
- the result of a conservative test on the target hair state.
The same tooth count can produce different published rates, and orientation alone does not predict removal percentage or finish.
Maintenance Boundary
Reverse orientation does not create one special service interval or diagnostic symptom. Toothed shears require alignment, clearance, tooth, edge, and tension assessment as a system. Follow the exact maker’s care guidance and use a technician who services that tooth construction rather than diagnosing the shear from orientation alone.
See Also
Blade orientation: Seiba vs Gyakuba → · Thinning-rate guide → · Comb-blade geometry → · Best Japanese scissors by tier →
Key Characteristics
- Comb or toothed blade is on the moving side
- Continuous cutting edge is on the static side
- Orientation is separate from tooth count, tooth profile, and cut rate
- Maker letter codes and translated labels are not transferable across brands
Use this entry for
- Comparing named reverse-orientation thinning models
- Following a maker's model-specific technique guidance
- Checking tooth profile, rate, handedness, and blade pairing separately
- Testing conservatively on the intended section and motion
Sources
5 sources- 🇯🇵 Hikari Scissors — Official (manufacturer official)
- 🇯🇵 Naruto Scissors — Official (manufacturer official)
- 🌐 Joewell Scissors — Official Japan (manufacturer official)
- Mizutani Scissors — North America (manufacturer official)
- Kasho / KAI Corporation (manufacturer official)
Frequently Asked Questions
4 answers you can open one at a timeWhat does Gyakuba mean?
Gyakuba (逆刃) means reverse blade. For a single-comb thinning shear, it commonly describes the comb or toothed blade being on the moving side while the continuous cutting edge is on the static side.
How does Gyakuba differ from standard orientation?
In a commonly documented standard orientation, the continuous-edge blade moves and the comb blade is static. Gyakuba reverses those positions. This describes construction only; tooth design, rate, clearance, handedness, and intended use remain separate specifications.
Does a reverse thinner guarantee a particular feed direction or improve fades?
No controlled comparison or adequate first-party mechanics diagram was found for a universal feed or lift mechanism. Some makers position named reverse models for fades, blurring, nape work, or scissor-over-comb, but those claims should stay attached to those exact models.
Is Gyakuba limited to one national training tradition?
No. Orientation does not define nationality, occupation, training system, or experience level. Choose from the exact model’s tooth geometry, published rate, handedness, maker instructions, and a careful test on your own workflow.
Comments & questions
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