Select the pattern
Recall the required keyhole or straight style and set its length, width, pitch, bartack and cutting sequence.
Programmable electronic keyhole buttonholing · long-tail trim subclass
Siruba BH-9820E-01: tailored buttonholes with production-level precision
A specialised two-thread chainstitch machine for programmable keyhole and straight buttonholes in tailoring, menswear and casualwear. Servo-controlled feeding keeps each shape consistent, while electronic pattern setup, automatic cutting, thread trimming and clamp lifting turn a complex garment operation into a repeatable production cycle.
- Keyhole buttonholes from 8–42mm and straight buttonholes from 5–42mm
- Programmable shape, stitch, cutting and bartack settings from the LCD control panel
- Long-tail trimming of both needle and bobbin threads for the -01 production workflow
- Up to 2,500 stitches per minute with precise servo/stepper-controlled feeding
- Automatic trim, thread clamp, presser-foot lift and needle positioning reduce repeated handling
BH-9820E-01 · keyhole specialist
2,500 sti/minMaximum sewing speed
8–42mmKeyhole buttonhole length
5–42mmStraight buttonhole length
550WAC servo upper-shaft motor
Position the garment—the machine controls the repeatable detail
Keyhole buttonholes combine shaped feeding, dense chainstitch overedge sewing, reinforcement and a precisely positioned cut. The BH-9820E-01 coordinates those stages electronically for consistent production.
Position and clamp
Align the garment component and activate the work clamp using the configured start control.
Sew and cut
Servo/stepper feed forms the programmed shape while the knife cuts before or after sewing as selected.
Trim and release
Both threads are trimmed with the -01 long-tail finish, and the clamp lifts for the next piece.
Create the shape the garment calls for
The BH-9820 platform supports eyelet/keyhole and straight buttonholes with selectable reinforcement styles. Available results depend on the installed knife, hammer, clamp and gauge parts.
A flowing reinforced finish often chosen for tailored keyholes.
A defined cross-bar finish at the end of the buttonhole.
A rounded reinforcement profile for selected styles.
A clean shaped opening without a programmed end bar.
Non-eyelet buttonhole patterns from 5–42mm.
Gauge parts define the physical cut: software controls pattern geometry and knife position compensation, but the installed knife, hammer/anvil, clamp and gauge set must match the required buttonhole. Optional round holes require the appropriate parts.
Designed for garments where the buttonhole is part of the tailoring
Men’s tailoring
Jackets, waistcoats, coats and trousers requiring consistent keyhole or straight buttonholes.
Suit production
Programmable repeatability for production lines, tailoring rooms and short-run manufacturing.
Casualwear
Structured shirts, overshirts, jackets and trousers with varied button sizes and hole styles.
Outerwear
Coats and structured garments where a rounded eye distributes strain around the button shank.
Uniforms
Consistent, professional openings across repeated garments, sizes and production batches.
Workwear
Selected workwear applications after confirming the material stack, gauge and trim requirement.
Short production runs
Quick electronic pattern changes reduce mechanical adjustment when styles vary through the day.
Sample rooms
Build and refine production-ready buttonhole specifications before bulk manufacture.
A dedicated production machine: the BH-9820E-01 only makes programmed eyelet/keyhole, straight and compatible round-hole operations. It does not replace a plain sewer or a domestic buttonhole machine for general sewing.
Change the style without rebuilding the machine for every pattern
Three stepper motors control X, Y and rotational movement, keeping the programmed outline accurate at production speed.
Set buttonhole length, stitch pitch, overedge width, eyelet size and bartack details around the garment specification.
Choose cutting before or after sewing according to the material, finish and production method.
Make precise knife-spacing and position corrections through the panel instead of relying only on mechanical adjustment.
Icons and characters make pattern selection, checking and mode changes easier for the operator to understand.
Specially processed gears and cams are designed to reduce vibration and lower measured noise versus earlier construction.
Updated looper, take-up and bobbin-thread clamping help reduce skipped stitches and unstable thread tails.
Thread trimming, electronic thread clamping, presser-foot lifting and needle positioning support a smooth cycle.
Focused illumination makes alignment marks, the clamp area and sewn result easier to inspect.
Best for varied production: electronic pattern recall is especially valuable when the workroom changes between jacket fronts, lapels, sleeves, coats and trousers rather than running one fixed buttonhole all season.
Operator-friendly programming
See the pattern and settings before the knife ever reaches the garment
The graphical LCD panel helps the operator select a stored pattern, review its dimensions, adjust speed and work through test or manual modes before production begins.
- Icon and character-based pattern display
- Automatic, test, manual, cycle and program modes
- Buttonhole length and stitch-density control
- Bartack type and dimension settings
- Knife-before or knife-after selection
- Knife-spacing and position compensation
- Sewing-speed setting from 1,000–2,500 stitches/min
Both threads are cut—with useful tails left for secure production handling
The BH-9820E-01 is the long-tail subclass. It trims both the needle and bobbin threads but intentionally leaves longer ends than the -02 short-trim configuration.
They give the operator or subsequent process more thread to hold and manage, supporting secure handling through tailoring operations.
“Automatic trim” does not promise an ultra-close cosmetic finish. A secondary finishing trim may be part of the workroom method.
It combines versatile 5–42mm straight and 8–42mm eyelet ranges with trimming of both threads for menswear and casualwear.
Subclass choice matters: the -02 is the short-thread-trim jeans/trouser specification with different gauge-length ranges. Confirm the required thread-tail finish, buttonhole length and material stack before ordering.
Plan power, compressed air, access and operator setup before delivery
- Clean, regulated external air supply required
- Main regulator: 0.5MPa
- Hammer regulator: 0.4MPa
- Rated consumption: 43.2L/min at 8 cycles/min
- Compressor and air treatment to be confirmed
- 550W AC servo upper-shaft motor
- 400VA control-system specification
- Exact NZ supply version must be confirmed
- Machine head approximately 120kg
- Allow safe access for installation and service
- Confirm knife and hammer/anvil length
- Confirm clamp and gauge set
- Confirm required hole shapes and trim tails
- Supply garment samples and production thread
- Arrange operator training and test sew-off
This is a consultative industrial purchase: the compressor, electrical variant, table/stand configuration, knives, hammers, clamps, gauge parts, options, freight and commissioning should be specified against your actual garments before the quotation is finalised.
The -01 balances pattern range with upper and lower long-tail trimming
| Feature | BH-9820E-00 | BH-9820E-01 this machine |
BH-9820E-02 |
|---|---|---|---|
| Primary application | Suiting and womenswear; extended buttonhole length | Menswear, tailoring and casualwear | Jeans, trousers and workwear |
| Needle-thread trim | Long tail | Long tail | Short tail |
| Bobbin-thread trim | No automatic lower-thread trim | Long tail | Short tail |
| Keyhole length | 8–50mm | 8–42mm | Selected gauge ranges from 14–42mm |
| Straight-hole length | Up to 50mm | 5–42mm | Gauge-specific ranges |
| Choose it when | The longest 50mm range matters more than lower-thread trimming | You want versatile menswear lengths and automatic trimming of both threads with manageable tails | Short thread tails and jeans/trouser production are the priority |
Subclass availability and E-series configuration can vary by market. Direct Sewing will confirm the exact supplied specification before order.
Siruba BH-9820E-01 at a glance
| Model | Siruba BH-9820E-01 |
|---|---|
| Machine type | Direct-drive programmable electronic eyelet/keyhole buttonholing machine |
| Stitch formation | Two-thread chainstitch buttonhole overedge formation |
| Primary application | Menswear, tailoring, suiting and casualwear |
| Keyhole / round-head sewing length | 8–42mm |
| Straight buttonhole sewing length | 5–42mm |
| Sewing shapes | Keyhole and straight patterns with no bartack, taper bartack, straight bartack, round bartack and compatible circular-stitch options |
| Maximum sewing speed | 2,500 stitches per minute |
| Speed setting range | 1,000–2,500 stitches per minute, adjustable in programmed settings |
| Stitch pitch | 0.5–2.0mm |
| Overedge / zigzag width | 1.5–5.0mm electronic adjustment range; 4.0mm mechanical maximum plus compensation to 5.0mm |
| Factory overedge width | 2.5mm for the -01 general menswear specification |
| Taper-bartack length | 0–20mm |
| Work-clamp lift | 12mm standard; configuration up to 16mm possible |
| Standard presser-foot length | 30mm |
| Standard hammer/anvil length | 22mm |
| Accessory hammer/anvil length | 30mm |
| Feed mechanism | Intermittent programmable feed controlled by three stepper motors: X, Y and rotational θ |
| Needle system | DO × 558, Nm80–Nm120 |
| Needle-thread trimming | Automatic long-tail trim |
| Bobbin-thread trimming | Automatic long-tail trim |
| Automatic functions | Thread trimming, electronic thread clamping, presser-foot lifting and needle positioning |
| Cutting sequence | Knife cut before or after sewing, programmable by operation |
| Control panel | Graphical multi-language LCD with icon and character display |
| Upper-shaft motor | 550W AC servo motor |
| Air pressure | Main regulator 0.5MPa; hammer-pressure regulator 0.4MPa |
| Rated air consumption | 43.2L/min at 8 cycles per minute |
| Control power specification | 400VA; exact NZ electrical version to be confirmed before supply |
| Safety | Emergency-stop function and safety-circuit automatic stop |
| Approximate component weight | Machine head 120kg; panel 0.6kg; control box 14.2–16.2kg depending on supplied version |
Protect the stitch, cut and pattern alignment with disciplined maintenance
- Clean thread waste and lint from the looper, clamp, knife and hammer areas at the intervals required by production volume.
- Use only the specified oil and follow Siruba's lubrication schedule and maintenance instructions.
- Check knife and hammer condition whenever cutting becomes ragged, displaced or inconsistent.
- Replace damaged or deflected needles promptly and select DO × 558 size for the material and thread.
- Maintain clean, dry and correctly regulated compressed air to protect pneumatic components.
- Test every new material, interlining, thread and program combination before releasing it to production.
- Use a trained industrial technician for timing, knife alignment, electronics, pneumatics and servo/stepper service.
Siruba BH-9820E-01 questions answered
What does the Siruba BH-9820E-01 do?
It automatically sews and cuts programmable keyhole/eyelet and straight buttonholes using a specialised two-thread chainstitch formation. The operator positions the garment and selects the program; the machine controls the shaped feed, stitching, cut, thread trim and clamp cycle.
What is a keyhole buttonhole?
It has a rounded eye at one end of a narrow slit. The eye gives the button shank room to sit and helps distribute strain, which is why keyholes are common on tailored jackets, coats, waistcoats and trousers.
What does the “-01” subclass mean?
The -01 specification is aimed primarily at menswear and casualwear. It covers keyholes from 8–42mm and straight holes from 5–42mm, and automatically trims both needle and bobbin threads with longer tails.
What is different about the BH-9820E version?
The E-series adds the current electronic operator package described by Siruba, including automatic thread trimming, electronic thread clamping, automatic presser-foot lifting, needle positioning, LED lighting and LCD control. Exact regional configuration is confirmed at quotation.
What buttonhole lengths can it sew?
The -01 specification covers keyhole/round-head buttonholes from 8–42mm and straight buttonholes from 5–42mm, subject to the installed knife, hammer, clamp and gauge parts.
Can it sew straight buttonholes as well as keyholes?
Yes. The programmed sewing range includes straight non-eyelet buttonholes. The physical cutting parts must match the intended hole.
Can it sew round holes?
Round-hole operation is possible on the -01 platform when fitted with the appropriate optional knife, hammer/anvil and gauge parts. Confirm the required diameter when requesting a quotation.
What bartack styles can it make?
The platform supports no bartack, taper, straight and round bartack patterns, plus compatible circular-stitch shapes. The chosen program and installed gauge set determine the final result.
Does the machine cut the hole automatically?
Yes. The pneumatic knife and hammer system cuts the opening. Cut-before or cut-after sewing can be selected according to the material and production method.
Does it automatically trim the threads?
Yes. The -01 trims both needle and bobbin threads, leaving longer tails than the short-trim -02 specification.
Why does the -01 leave long thread tails?
Longer tails give the operator or subsequent production process more thread to grip and manage securely. This is a deliberate production specification and may be followed by a cosmetic finishing trim.
What is the maximum speed?
Up to 2,500 stitches per minute. Sewing speed can be programmed from 1,000–2,500 stitches per minute to suit the material, thread and buttonhole.
How does it keep the buttonhole shape accurate?
Three stepper motors control X, Y and rotational feed movement according to the stored sewing data. This gives the machine precise control over the eye, legs and reinforcement pattern.
Is the buttonhole size changed electronically?
Many dimensions and sewing parameters are changed at the LCD panel, but the knife, hammer/anvil, clamp and gauge set still define important physical limits. A different cut size may require parts as well as a program change.
What fabrics is the -01 intended for?
It is positioned for menswear, tailoring, suiting and casualwear. The correct result depends on the complete garment stack—including shell fabric, canvas, interlining, facing and seam allowance—so production samples should be tested.
Can it sew denim and workwear?
Selected applications may be possible, but Siruba positions the -02 short-trim subclass specifically for jeans, trousers and workwear. Compare the actual material, hole length and desired thread tails before choosing.
Can it sew domestic-style shirt buttonholes?
It can sew straight industrial buttonholes within the specified range, but it is a specialist chainstitch eyelet-buttonhole platform. For conventional lightweight shirt production, a dedicated lockstitch buttonholer may be a more economical match.
Does it require compressed air?
Yes. Siruba specifies 0.5MPa at the main regulator and 0.4MPa at the hammer regulator, with stated consumption of 43.2L/min at eight cycles per minute. A clean, dry, regulated supply is essential.
Is a compressor included?
Do not assume so. Compressor size, receiver, filtration, drying and connections should be specified for the installation and other equipment sharing the air supply. Direct Sewing will confirm what is included in the quotation.
What electrical supply does it need in New Zealand?
The BH-9820 platform is manufactured in several voltage configurations. Direct Sewing must confirm the exact NZ-supplied version and site requirements before installation; do not arrange electrical work from a generic overseas specification.
Which needle system does it use?
DO × 558 needles in sizes Nm80–Nm120 are specified. Needle size, thread and point must be selected for the garment stack and buttonhole program.
Does it come with every knife and clamp?
No single setup covers every possible length, cut and round-hole size. The quotation should list the standard installed gauge and any additional knives, hammers/anvils, clamps or optional parts required for your garments.
Can operators store different buttonhole programs?
Yes. The electronic system is intended for programmable pattern setup and rapid recall, making the machine well suited to short runs and mixed garment styles.
How large and heavy is the machine?
The machine head alone is approximately 120kg, with a separate control box and full industrial workstation. Delivery access, floor position, unloading and installation must be planned in advance.
Can we send samples before buying?
Yes—and for this class of machine, that is strongly recommended. Supply complete production stacks, the proposed thread, button size, required hole dimensions and an approved finish sample where possible.
Is training and commissioning required?
Professional setup and operator training are strongly recommended. Pattern programming, gauge selection, thread handling, knife alignment, pneumatic settings and daily cleaning all affect the production result.
Specify the buttonhole before you specify the machine
Send Direct Sewing your garment samples, button dimensions, required keyhole styles, thread and expected daily volume. The team can then confirm whether the BH-9820E-01 is the right subclass and quote the correct gauges, air requirements, delivery and setup.