Cloth Opener Mechanism - Brother RH-981A Service Manual

1-8. Cloth opener mechanism

1. The feed bracket (1) carries the cylinder 16 X 15 assembly (2), whose end is connected to the opening cylinder
rod (3), cylinder rod pin B (4), and the opening driving lever (5).
2. The opening connecting rod (6) attached to the opening driving lever (5) is connected to the fulcrum lever plate
(8) and the lever (9) via the slide block (7).
3. The projection (10) of the fulcrum lever plate (8) and the pin (11) of the lever (9) are fitted on the hole of the work
clamp plate (12) and the slide block on it.
4. When the cylinder 16 X 15 assembly (2) operates, and the stopper (13) of the opening driving lever (5) and the
bolt (14) make contact, the work clamp plate (12) moves in the direction of a, consequently opening a button
eyelet on the material.
5. At this time, there should be at least 1.3 mm clearance between the throat plate (15) and the needle plate (16).
Adjust the clearance using the bolt (14).
6. When the cylinder 16 X 15 assembly (2) is not pressurized, the work clamp plate (12) is moved in the direction of
b by the opening spring (17). At this time, the stopper (13) of the work clamp plate (12) makes contact with the
stopper plate (18).
* The c indicates the movement of the work clamp plate (12).
1.3 mm or more
RH-981A
1. MECHANICAL DESCRIPTIONS
3687Q
3688Q
6