FR2587372A2 - Dobby with improved hook selection - Google Patents

Abstract

Dobby according to the main patent consisting of a plurality of elastically deformable, parallel blades 25, intended, under the action of electromagnets, to interact with lifting hooks 17, characterised in that the blades 25 of the comb 24 are connected together in a permanent manner by a layer of material which is flexible, elastic or viscoelastic and which adheres to the said blades 25.

Description

ARMOR MECHANICS WITH IMPROVED SELECTION OF CRO
CHETS.

 The invention relates to an armor mechanism according to the main patent constituted by a plurality of parallel hook blades elastically deformable under the action of electromagnets. In the main patent, an armor mechanism has been described which essentially consists of a plurality of narallel blades, elastically deformable, intended under the action of electromagnets, to cooperate with lifting hooks.

 These blades are fixed to the base and free on the side of the hook to be able to act individually and independently of each other. When the action of the electromagnet ceases, the blades vibrate with too great an amplitude, which can lead to a possible unhooking of the hook, resulting in a false lift.

 To overcome this drawback, a known solution consists in fixing a rigid plate at the base of the comb, formed by the blades, thus reducing the amplitude of the blade. If on all the blades, the resulting effect is correct, individually, this hard element causes the rebound of each blade, so the problem remains, only the amplitude of the vibration is reduced.

 The invention overcomes this drawback, by proposing a device allowing the blades to act independently of one another, and without vibrating, namely, an armor mechanism according to the main patent, constituted by a plurality of parallel blades, elastically deformable , intended under the action of electromagnets to cooperate with lifting hooks, characterized in that the blades of the comb are connected together, and this permanently, over part of their length, by a layer of flexible material , elastic or viscoelastic, and adhering to said blades.

Advantageously, in practice
- the layer is continuous and coats the boards and the gap between the boards
- the layer is located in any place of the blades, except at the level of action of the electromagnets and at the ends of the blades
the layer is advantageously arranged in the vicinity of the base of the blades
- the width of the layer is between ten and fifty percent, and preferably between twenty and thirty five percent of the length of the boards;
- the material used is chosen from the group consisting of: a silicone sealant, a plasticized PVC, a natural or synthetic elastomer
- The deposition of the material is carried out by soaking, by spraying, by bonding of calendered films, by molding.

 The manner in which the invention can be implemented and the advantages which result therefrom will emerge more clearly from the embodiment which follows, given by way of non-limiting example, in support of the appended figures.

 Figure 1 is a large-scale vertical section of the hook selection system.

 Figure 2 is an exploded view showing a continuous distribution of the layer of flexible, elastic material adhering to the blades.

 Figure 3 is a perspective view of a comb having a discontinuous distribution of the layer of flexible, elastic material and adhering to the blades.

 FIG. 4 is a cross section along line III-III of FIG. 2.

As can be seen in Figure 1, the plate (1) is provided with holes (lc) for the passage of the hooks (17) of the armor mechanism according to the invention. The upper part of the hook (17) has a spout (17a). The upper plate (2) supports modules
(20) of the selection system, each module being intended
born with the order of several hooks.

Each module (20) includes a support (21) made
dried in non-magnetic material such as thermoplastic resin
than. The support (21) is associated with a pole piece
single (22) produced in the form of a flat plate
extended by tabs (22a) curved at four
ninety degrees from the general plan of said
plate, to form teeth (22b, 22c) offset longi
tudinally. We can better appreciate the details of
this pole piece in Figure 2.

A comb (24) whose blades (25) are oriented
downwards, is fixed to the support (21). The end of
each blade (25) is bent upward to form
a lug (25a) intended to cooperate with the spout (17a) of the
corresponding hook (17).

A permanent magnet (28) is arranged in parallel
to the internal face of the plate (2).

According to the invention, a continuous layer (40) of a
silicone sealant, white in color so as to
put more effective control over the correct distribution
of the layer, coating the blades (25) and the gap
(41) between the blades (25), is deposited by soaking on
part of their length between the base (24) and on the
third of their length. It has been found that by using
a cold vulcanized silicone sealant known as
registered trademark "RUBSON", if the width exceeds the
third of the blades we cancel the elastic return effect and
the independence of the blades, and if this width is
less than a fifth of the blades, the desired effect is insufficient and the vibrations persist.The layer (40) is distributed at the level of the gap (41) between the blades (25) to ensure the absorption of vibrations and around the blades (25), under the reference (42), to ensure the mechanical resistance of the layer (40), thus allowing better absorption of vibrations.

It follows from the present invention, an important property, namely, the absorption of the vibrations of the blades, hence, various advantages
- reduction in operating noise,
- increase in speed by removing
parasitic twists,
- easy adjustment of the spout (17a) of the hook (17)
relative to the beak (25a) of the blade (25)
- easy adjustment of the blade-coil air gap
(more precision)
- greater resistance of the blades
- reduced risk of hooking hooks
(17)
- protection of the permanent magnet by increase
sealing;
- reduction in vibrations of the electronic module,
hence better protection of this electro circuit
fuck.

Claims (6)

 1 / armor mechanism according to claim 1 of the main patent constituted by a plurality of blades (25) parallel, elastically deformable, intended under the action of electromagnets, to cooperate with lifting hooks (17), characterized in that the blades (25) of the comb (24) are permanently connected to each other by a layer (40) of a flexible, elastic or viscoelastic material and adhering to said blades (25).  2 / armor mechanics according to claim 1, characterized in that the layer (40) is continuous and coats the blades (25) and the gap (41) between the blades (25).  3 / armor mechanism according to claim 1, characterized in that the layer (40) is located in any location of the blades (25) except at the level of action of the electromagnets, and at the ends of the blades (25).  4 / armor mechanics according to one of claims 1 to 3, characterized in that the width of the layer (40) is between ten and fifty  percent, preferably between twenty and thirty five percent of the length of the blades (25).  5 / armor mechanics according to one of claims 1 to 4, characterized in that the material used is chosen from the group consisting of a silicone sealant, a plasticized PVC, or even a natural or synthetic elastomer.  6 / Armor mechanics according to one of claims 1 to 5, characterized in that the deposition of the material is carried out by soaking, by spraying, by bonding of calendered films or by molding.