Adjusting The Contact Between The Knife And The Hammer - Brother DH4-B981 Instruction Manual

9-11. Adjusting the contact between the knife and the hammer

1. Knife incision 2. Knife incision
is correct is too deep
19 mm
3 mm
Adjusting the contact between the knife and the hammer
To see the knife incision more easily, color the cutting surface of the hammer with a marker pen.
1. Operate the hammer three times with the knife making a mark on it each time.
2. Adjust the position of the hammer or contact between the knife and the hammer until the knife consistently makes
a mark in the same place.
Filing the cutting surface of the hammer
Use a flat file for filing.
1. Filing the cutting surface of the hammer on which the knife incision breaks off or is shifted
1-1. Grip the hammer in a vise.
1-2. File the surface of the hammer smoothly until the knife incision is eraced away.
2. Filing the cutting surface of the hammer in which knife incision is deep
2-1. Grip the hammer in a vise.
2-2. File the surface of the hammer smoothy until a single knife incision can still be seen faintly.
0971Q
3. Two knife 4. Partial knife
incisions incision
0972Q
DH4-B981
1. Remove the hammer. (Refer to the previous page.)
2. If the knife incision on the surface of the hammer is
very deep, if there are two or more incisions on the
hammer because different knives were used, or if only
part of the incision has been made, grind the sur-
face of the hammer smoothly until a single knife i n c i -
sion can still be seen faintly.
3. The cutting pressure over the whole of the hammer
should be uniform so that the material will be cut
cleanly.
Grind the surface of the hammer so that the knife inci-
sion will be uniform over the whole of the hammer.
* The hammer can be filed until its height is 19 mm.
4. If the material cannot be cut cleanly even though the
hammer has been ground correctly, check whether the
tip of the knife is worn.
* If the tip is worn, replace the knife.
Do not use the old hammer after the knife has
been replaced, otherwise it may damage the tip of
the knife.
9. STANDARD ADJUSTMENTS
59