Adler N291 Operating Instruction

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Foreword and general safety instructions

Part 1: Operation manual Cl. N291

1.Product specifications

1.1	Use for the intended purpose . . . . . . . . . . . . . . . . . . . . . . . .	5
1.2	Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5

2.Elements and their function

2.1	Elements at the machine head . . . . . . . . . . . . . . . . . . . . . . . .	6
2.2	Elements at the machine stand . . . . . . . . . . . . . . . . . . . . . . .	10

3.Operation of the sewing machine

3.1	Threading the needle thread . . . . . . . . . . . . . . . . . . . . . . . . .	12
3.2	Winding the bobbin thread . . . . . . . . . . . . . . . . . . . . . . . . . .	12
3.3	Changing the bobbin . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
3.4	Setting the bobbin thread tension . . . . . . . . . . . . . . . . . . . . . .	12

4. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents:		Page:
Part 2: Installation manual Cl. N291
1.	General information . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
2.	Assembling the machine stand . . . . . . . . . . . . . . . . . . . . .	6
3.	Completing and screwing on the table top . . . . . . . . . . . . . . .	6
4.	Connecting the sewing machine motor to the table top . . . . . . .	6

5.Mounting the machine head, positioning the V-belt and

	fastening the pedal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
6.	Fastening the handwheel and synchronizer . . . . . . . . . . . . . .	8
7.	Connecting the maintenance unit . . . . . . . . . . . . . . . . . . . .	8
8.	Laying and connecting the electrical cables . . . . . . . . . . . . . .	8
9.	Filling in the oil and readying the machine for service . . . . . . . .	8

10.Making a sewing test and checking the oil supply of the

mist lubricator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

The following patents and registered designs apply:

Status September 1992

1. Product specifications

1.1 Use for the intended purpose

The sewing unit must only be used for sewing textile fibres and leather.

1.2 Technical data

Needle system:
depending on sewing equipment:	2134-35 DUKK
	134 KK
Maximum number of stitches:
depending on sewing foot stroke
and stitch length:	2000, 3000, 4000 1/min
Maximum stitch length
forward (v), reverse (r)
N291-164 062:	6 (v); 6 (r) mm
N291 185 082:	10 (v), 8 (r) mm
Maximum sewing foot stroke:	7 mm
Operating pressure:	6 + /-0.5 bar
Line pressure:	7-10 bar
Air consumption per work cycle:	0.15 NL
Maximum clearance under the
sewing feet:
When sewing:	10 mm
When feet are lifted in needle
up position:	17 mm
Maximum bobbin capacity:
with a thread size of Nm 80/2:	95 m
Maximum thread size:
Cotton:	11/3 NeB
Synth. continuous:	11/3 Nm
Corespun thread (polycotton):	11/4 Nm

2. Elements and their function

2.1 Elements at the machine head

Element	function
Screw 1	– This screw for the sewing foot pressure is turned in
	completely at the factory.
	Therefore, do not change its adjustment!
Thread guide 2	– Depending on the material thickness, sewing thread
	and stitch length, the position of the thread guide
	must be adjusted such that controlled guiding of the
	needle thread around the hook is assured.
	When it is set at "0" the largest amount of thread is
	released, as is required for very long stitches and
	very thick material.
Turning knob 3	– Setting the additional tension engageable with lever
	5 at the desired value.
Lever 4	– Opening the needle thread main tension and needle
	thread additional tension.
Lever 5	– Activating and deactivating the additional tension.
	To do this, unlock the lever by pulling it to the right,
	and then change over.
Dial 6	– Set the "higher" foot stroke that has been activated
	with the corresponding key or knee switch.
Dial 7	– Set the "smaller" foot stroke.
Sight glass 8 with	– Indicating the oil level in the reservoir. The oil level
inlet opening	must not drop below "MIN". If necessary, fill the oil
	ESSO "SP NK 10" into the oil reservoir up to the
	mark "MAX".

Turning knob 9 Turning knob 10 Hand lever 11

–Setting the reverse stitch length.

–Setting the forward stitch length.

–Changing the stitch length infinitely between the adjusted forward and reverse stitch length.

Turning knob 12	– Setting the needle thread main tension at the
	desired value.
Lever 13	– Determining whether the needle thread main tension
	is opened or closed while the foot is lifted.
	Lever up: Tension opened
	Lever down: Tension closed
Needle 14	– When changing the needle, always turn off
	the main switch.
	Otherwise there is danger of injury!
Locking button 15	– Locking the sewing foot in its lifted position.

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