Needle Rise, Hook Clearance, Needle Height And Needle Guard (On The Pfaff 1574) - Pfaff 1571 Adjustment Manual

15 Needle rise, hook clearance, needle height and needle guard
.04.05a
Requirement
With the needle bar positioned 2,4 mm after BDC on both hooks
1. the hook point must be at needle centre with a hook-to-needle clearance of 0.05 to 0.1 mm;
2. the top of the needle eye must be 0.8 to 1.0 mm below the hook points;
3. the needle guard 9 must touch the needle lightly.
7
8
8
Fig. 15 - 05
 Loosen screws 1, 2, 3, 4, 5, 6 and 7
 Loosen screws 8 slightly.
 Bring the needle bar to 2.4 mm after b.d.c.
 Set both hook points to the centre of the needle, taking care to see that the needles are
not defl ected by needle guard 9.
 Set the needle height in accordance with requirement 2
 Adjust both hook posts in accordance with requirement 1 and tighten screws 8.
 Tighten screws 1 and 6.
 Taking the play of the bevel gear into consideration, tighten screws 3 and 5.
 Move adjustment ring 10 against bevel gear 11 and tighten screws 2.
 Move adjustment ring 13 against bevel gear 14 and tighten screws 4.
 Tighten screws 7 on both sides of the post.
 Adjust needle guard 9 (screw 14) on both hooks in accordance with requirement 3.
14
9
7
7
7
When the hook is changed, make sure that markings 15 and 16 are on one side.
(on the PFAFF 157 4)
9
4
2
1
3
10 11
Adjustment
15
16
5
6
12 13
11