Seam quality depends on shape and length of counter tip of the sewing hook

If the seam quality is poor even though stitch regulator, hook and thread tension are well adjusted, the reason can be the following:
The counter tip of the hook together with the thread tension spring should control the upper thread as long as possible without drawing and feeding it from the thread reel for stitch lengths up to 4mm. For stitch lengths above 4mm, there should only be enough thread feed by the hook counter tip that the thread can be tightened well by the thread lever. Only an optimal shape and length of the counter tip of the hook can ensure this.

The counter tip should have its smallest width at "a". A cutoff at "b" is not allowed.

The distance between hook tip and hook counter tip should be 0,2 mm with a tolerance of +/- 0,4mm.

Hook counter tip: Pic. 1: Regular measure, Pic. 2: maximum difference, Pic. 3: lowest difference (overlapping)

If the hook counter tip is too short and the shape of the tip is too slim, the upper thread will fall down too early and will twist. This may lead to knots on the lower side of the fabric. If the hook counter tip is too long and cutoff at "b", the upper thread will fall down too early and will be feeded without tightening. This will lead to loops on the lower side of the fabric that are not tightened. When using unelastic threads (e.g. cotton), the thread may break.

Causes of bad stitch draw-in

If the stich is not drawn in well while sewing, the causes often are:

• the bobbin thread is too tight
• the turning of the bobbin thread is uneven
• the bobbin thread is too loose
• the feed is unsteady or does not match temporally to the sewing mechanism
• the stich hole or the sewing foot slot are not rounded well
• the thread is twisted too much

For double lockstich sewing machines, needle and bobbin thread must be calibrated to each other in a way that the plaiting of needle and bobbin thread is drawn into the middle of the fabric layers. This ensures a maximum elasticity and durability of the seam.

The bobbin thread tension mechanism consists of a brake spring and a tension spring who are fastened on the outer side of the bobbin case and press to the case wall. While threading, the bobbin thread will be led behind the tension spring. The bobbin thread tension mechanism is meant to brake and control the roll-off of the bobbin thread. The tension can be adjusted by a screw..

Bobbin thread mechansim: Bobbin case wall (Spulengehäusewand), fastening screw (Befestigungsschraube), tension spring (Spannungsfeder), bobbin thread (Greiferfaden)

The thread tensions for the double chain stitch are adjusted correctly when the needle thread creates a point-shaped loop on the bottom side of the fabric and when the hook thread can be drawn easiliy through the loop. The regulation of the hook thread tension can be made by a disc tension or wheel tension.

Best Practice: Visual bobbin thread monitor for Dürkopp Adler M-Type

Easy, affordable and effective: Control the remaining bobbin thread quantity through an inspection window and an additional bobbin illumination in the hook area!
The solution can easily be retrofitted with parts kits for different machine classes. The LED bobbin illumination 0867 591244 must be ordered in addition and can be conntected with the power supply 9850 001089.

The order numbers of the assembly kits depend on the bobbin diameter:

The parts kit 0867 591204 (bobbin diameter 26mm) fits for M-Type classes
827-160122
867-190020
867-190122
867-190322
867-190322-M

The parts kit 0867 591214 (bobbin diameter 32mm) fits for M-Type classes
867-190040
867-190142
867-190142-M
867-190342
867-190342-M

Open M-Type product overview


Visual bobbin thread monitor for Dürkopp Adler M-Type with bobbin illumination




Bobbin for visual thread monitor for Dürkopp Adler M-Type

The retrofit kit 0867 591204 consists of the part numbers:
1x 0867 140203 slider, right
1x 0867 150170 spring
4x 0867 150140 bobbin, diameter 26

The retrofit kit 0867 591214 consists of the part numbers:
1x 0867 140203 slider, right
1x 0867 150170 spring
4x 0867 150150 bobbin, diameter 32

Oil-free hook for Dürkopp Adler class 271 to 275

The machine type Dürkopp Adler 270 (classes 271, 272, 273, 274, 275) can be converted to an oil-free hook version with the conversion kit 0271 590014.

After changing the hook, the oil tank, and attaching a note sticker, it is necessary to limit the machine to a maximum speed of 4.000 rpm.

Conversion Instruction (german/ english)

Dürkopp Adler class 271: Conversion to oil-free hook version possible

Extra large hooks: 70% more capacity and less bobbin change

Dürkopp Adler offers extra large hooks (XXL-Hooks) for various medium and heavy duty sewing machines, from older models like 767 to the actual M-Type series.
These hooks have 70% more capacity compared with the regular hooks, which brings a lot of benefits to the user.
See details about the advantages in the XXL flyer.

Adjustable needle guard for hooks for Dürkopp Adler class 267 and class 269

For Dürkopp Adler classes 267 and 269 a new hook with adjustable needle guard is available.

Your benefits:

• precise and quick adjustment of needle guard
• time saving of 70%
• longer duration of hook

sew24.com - Online shop for compatible parts for Pfaff, Juki and other industrial sewing machines brands

Order compatible wear & tear parts for various sewing machine brands in Dürkopp Adler quality from stock in the online shop http://www.sew24.com/.
Payment is easy by credit card for example. A worldwide quick delivery with reasonable cost is granted. Especially hooks and bobbin cases are recommeded and can be identified easily.
With this offer, Dürkopp Adler strengthens its position as a leading service and parts supplier for the industrial sewing industry and sets new standards for the future distribution of industrial sewing machine parts.


Hook DJ107 22551 compatible for Juki LU-2210 and LU-2212