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Cours de tissage 1912
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- Mécanique 104 Jacquard
- Fonctionnement 104
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Adjusting the Mechanism 104
The mechanical 104 hooks, like all Jacquard mechanics, includes several very important settings, the two main ones being:
1 - Cylinder adjustment: The cylinder must be adjusted so that the end of the needles is in the center of the holes drilled in the cartons. For this purpose, the cylinder is adjustable in height by the screws which support the frogs of the cylinder and in width by the displacement of the wing obtained by the pivoting screws and located at the upper part of the mechanism. How to Check a Cylinder: To check if a cylinder is in place, proceed as follows. It is necessary first to open the pitch to move the cylinder away so that it is possible to blacken the point of the needles with any black fat, which is applied with a finger against the point of the needles. The pitch is then closed to press one of the cartons of the cylinder. The needles which are pushed mark a point on the part of the cardboard where they rest and it is sufficient to check if these points are in their place ie in the middle of the holes which would be pierced if the needles had to be In engagement and thereafter to check the position of the cylinder. This operation must be repeated for the 4 faces of the cylinder, using as much as possible taffeta-punched cartons or half-wearing armor.
2 - Adjustment of the press: The adjustment of the press is understood to mean the adjustment of the thrust which the carton exerts on the point of the needles in order to give a sufficient recoil to the hooks which must remain at rest so that they escape from the blades Of the claw. This adjustment is made by the press screw attached to the body of the mechanism using a wing nut and a lock nut. The recoil of the hooks remaining in the bottom (or the mechanical press) must be 3 to 4 mm. Outside these two main settings indicated above, there are still two other settings:
3 - Adjusting the latches: In order for the cylinder to rotate without the corners of the carton hooking on the point of the needles, it is essential that they are driven by the catches acting on the lantern of the cylinder only when it is sufficiently Far from the point of the needles. It is enough to make sure to open slowly the pitch so as to be able to follow the evolution of the cylinder. It is also necessary to realize whether the two latches acting in good conditions, that is to say in time for the cylinder to have completed frankly a quarter turn at the moment when the pitch is completely open.
4 - The adjustment of the debris of the hooks consists in limiting the descent of the claw blades below the head of the hooks. The body of the mechanism is stopped and rests on 4 wooden clamps screwed against the binoculars, the height of these cleats is such that the claw blades descend 8 to 10 mm below the head of the hooks.
Operation of the mechanics 104
When the mechanism is at rest, the cylinder on which the carton chain is placed is against the needles, the point of which has encountered the unperforated cardboard, they are pushed about 4 mm and the hooks they control Are then moved away from the claw blades, while the needles whose tip has encountered a hole in the carton have passed through the carton and remain in front with their hooks lying between the claw blades ready to be lifted.
To obtain the opening of the step it is sufficient to tread the step corresponding to the rocker of the mechanism by means of a rope or a rod. When walking down, the rope is unrolled from the grooved pulley by causing the rocker to describe about a third of turn.
The strap which connects the sleeve of the rocker to the body of the mechanism being placed on the opposite side to the chord of the step, winds up on the sleeve, causing in its ascencional movement the body of the mechanism.The hooks, the needles of which have been pushed back by the unperforated carton, remain at rest, ie at the bottom, while those whose needles have encountered the holes in the carton and have remained forward against the claw blades are lifted By the box of the mechanics.
The press roller located at the front end of the pressing screw also follows the upward movement of the body by acting on the bent part which causes it to be moved away as well as that of the wing.
At the moment when the wing moves away, the upper latch hooks the lantern spindles and turns the cylinder, which then has the next carton against the needles, a quarter turn.
In order to close the step, it is enough to let go of the step, the rope of the step is wound on the pulley while the strap is unrolling from the sleeve and the box descends bringing the hooks to their rest position as well as the wing and The cylinder against the needles.
The new cardboard presented by the cylinder against the needles, in turn, selects the hooks which can be raised on the next stroke.
Practical hand weaving course
Lyon Municipal Weaving SchoolProfessor A.CREPT - Year 1912-1913
The handwritten course has been copied by us.This hand weaving course on looms was used until the 1980s.
