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5. LUBRICATION MECHANISM
(1) Lubrication
Lubrication mechanism of this sewing machine is as shown in the figure below.
Flow of oil is shown with the arrow marks in the figure.
Oil in oil reservoir 1 is sucked and kept in oil tank 2 once, and lubricated to the necessary places by means of
the plunger pump making use of the main shaft.
The role of this plunger pump combines with the role of the reflux pump as well as the aforementioned forced
lubrication.
Excessive oil kept in the face side cover section is collected with reflux felt 3 and the collected oil is sucked up
through reflux pipe 4.
(2) Lubricating the respective components
1) Oil kept in oil tank 2 is lubricated to :
(A) To needle bar rocking rear arm 5 and needle rocking shaft 6 with oil wick.
(B) To main shaft front bushing 7 components with oil wick.
(C) To thread take-up lever 8 components with oil wick.
(D) To needle bar 9 components with oil wick.
In addition, excessive oil kept in the oil tank is returned to oil reservoir 1 through waste oil pipe !4.
Besides, oil dropping from main shaft front bushing
7
is lubricated to needle bar rocking shaft front bushing
!0
.
1
2
3
4
5
6
7
8
!0
!1
!2
!3
!4
!5
!6
9
Oil hole Oil hole
Oil hole
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