Tehnologie de Montare a Lentilelor

8/6/2019 Tehnologie de Montare a Lentilelor

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/2ASSEMBLING THE FRAME WITH OR WITHOUT THE HOOKING TOOL

ASSEMBLING RIM AND LENSES

It is possible to assemble the frame in avery intuitive way by using tiny rubber bands

and small pliers (or our special tool)...Insert the lenses in the rim guiding it insidethe lens channel. Lock the wire on the lenseswith the rubber bands. This assembly of rimand lenses is a stable whole.

INSERT THE RIM INTO THE BAR

Insert the assembly (rim+lenses) wholeinside the bar's fold.

Once the rim is totaly inserted, thehooking teeth will be positioned exactly infront of the bar's bridge, slightly over it.

From the inner part of the frame (positionshow on section ) hold the rim's and bar'sbridges with the pliers (endowed with smoothand flat faces in order not to damage thebridges).

LOCKING THE FRAME

With the necessary strength close the plierssoftly. As shown in section (the pliers actas the special tool) procede to lock theframe. Rotate the pliers slowly forwardkeeping them closed in the bridges, withthe rim's hooking tooth adherent and in frontof the bar's bridge.

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CHANNELS CURVATURE COMPENSATION

BASE 0

BASE 6

negativeoffset

positiveoffset

L 140 mm

B6

B4

B0

L 139 mm

L 141 mm

CORRECT

LONG

SHORT

B6

B4

B0

offset - 0,10 mm = L 140 mm

offset 0,00 mm = L 140 mm

offset + 0,10 mm = L 140 mm

CORRECT

CORRECT

CORRECT

TOTAL OFFSET = 0,00 mm

BASE 4

The grooving of a nominal channel (0,4 x 0,7)with spherical curvature different from thestandard (Base 4) on a lens obtained from anexact copy of the shape of the supplied former

will bring variations on the length of thechannel with respect to the standard lens,increasing with the increase of the curvatureand decreasing in the opposite case.

To keep invariant the length of the channelit is necessary to enact some compensationsby changing the dimension of the lens in theopposite direction to the curve variation,adjusting the lens cutting parameters in orderto obtain a positive radial offset (increase thelens dimension to compensate a lowercurvature) or negative (to decrease it) in theopposite case.

Average sufficient compensations are:

- offset - 0,10 mm,

for an increased curvature from B4 to B6

- offset 0,00for B4 (no correction necessary)

- offset + 0,10 mm,for an decreased curvature from B4 to B0

These rough parameters are marked on theArquo's formers as a memo for the lab

technician and as a constant recall to theprecision needed for the correct execution of

the lens and channel cut.

APPENDIICEALLEISTRUZIONIMONTAGGIO

LENTIver1.1

APPENDIXTO

LENSMOUNTIN

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INSTRUCTIONver1.1

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t+390423972412

f+390

423935096

[email protected]

www.arquo.it


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LENS CUTTING ANDGROOVING

LENS MOUNTING

ARQUO 700 SERIES F.A.R.

FULL ACETATE RIM

The Arquo 700 Series FAR is endowed withthin acetate fronts (2 mm width) opened atthe nose level where both the rim's browbarlocking tooth (I) and the nose pad holder (II)groove are located. On the front frame a

square (III) 0,60 x 0,60 mm tooth is locatedfor the usual Arquo reverse channel lensmounting.

Lens mounting is done as in a normalacetate frame, with special attention onavoiding damages to the thin acetate frameand lens holding tooth (acetate is a delicatematerial in comparison with polymericmaterials as Nylon).There is no need for special lens mountingtools but it can be useful to lightly heat up theframe to ease the fitting of rigid/large lenses.Front frame and lens holding tooth must not

be damaged during the lens mountingprocess, therefore avoid forcing in too largelenses and heating too much the material(only a small warm up of the frame isallowed in order not to overcome the usualthermal elasticity of the acetate and not todamage the lens locking tooth).

As in Nylor frames it is possible (but norecommended) to use a flat band to slidethe lens on the lens locking tooth. Special

attention must be paid in order not todamage the tooth and the frame (on thehedges in particular) since the band easilyallows the transfer considerable of force onthe frame. Moreover the band requires foritself a further elasticity on the rim side inorder to make space for the band extrathickness.

Optical Lenses, Presentation Lenses andFormers hold the same specifications ofthe standard full steel Arquo. In particular itis necessary to cut and groove the lenseswith the same precision, and also to

compensate the lens and groovedimension according to lens (groove)curvature variation from the standard Base4 (Appendix B/2). Admissible tolerance areunchanged (precision mounting).

It is possible to grove a channel deeper thanthe standard (0,40 mm) in order to improvethe stability of the mounted lenses. In thiscase the greater depth of the channel mustbe matched by an equal enlargement of thelens. For an optimal stable lens fit a channeldepth of 0,50 mm is suggested (+0,1mmoffset in lens cutting) and the channel wallsmust be vertical (avoid rounded channels)since the frame lens locking tooth issquared of section. A greater channel depthmakes more difficult to remove the lens,increases the risk of damage the lens on theborder of the channel (especially for brittlematerials like CR39) and the lens lockingteeth on the frame.

REMOVING THE LENSES

To remove the lenses proceed as withnormal thin acetate frames, pushing out thelens from the center and opening the rim inthe middle so that the lens can get out of the

lens locking tooth. Proceed by acompayiningthe exit of the lens from the center with thesame action. Alternatively it is possible to freethe lens in the center of the frame (bridgearea) by pulling the lens toward the externalborder of the rim.If the lens is tightly inserted into the frame it ispossible to ease the operation by warmingup gently the frame in order to soften andincrease the elasticity of the acetate material,but without causing excessive/irreversibledeformations.

LOCKING THE RIM ON THE BAR

In order to easily keep the front rim properlylocked on the browbar a special stainlesssteel wedge is supplied. The wedge must beinserted on the central open area of the rimbefore mounting the lenses and removed atthe end of the process. When the wedge isinserted make sure that the rim bar lockingtooth is correctly placed in order to allow theproper locking of the rim on the bar.

LENS MOUNTING

To mount the lenses start by inserting thelens from the center of the frame (nose) andchecking carefully that the lens locking toothis correctly inserted in the lens channel(Start). The lens is then continuously guidedinto the correct position passing through themiddle to the external side (Step2). Finish byforcing inside the external edges of the lensby means of an action done with the fingers,pushing inside the lens and pulling the frameborder toward the outside, starting with themore edgy corner (usually the one towardthe top of the frame) (Step3) and finishingwith the remaining one (Step4).

PUSH

PUSH

RIM

BAR

F.A.R. F.A.R.

RIM

GROOVE

STEP3

STEP4

FINISH

START

STEP2

( I )

( II )

( III )

arquo series 700 F_01 ENG

Tehnologie de Montare a Lentilelor

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