JP5269555B2 - Mold tape winding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tape winding device of a mold in which a mold set of two matrix molds is made into a shape in which a material filling gap is parallel or inclined, and a general lens for glasses or a lens with prism prescription is obtained, in molding of a plastic lens for the glasses. <P>SOLUTION: A cylindrical mold holder 18 in which two matrix molds 19 are opposedly set in parallel or so that one side may be slanted, is sideways mounted on a fixed cradle 10 of a machine body intermediate. The mold in the mold holder is attracted and supported with an attraction unit 1 which has attraction bodies 3 and several reversible fixed shafts 4 in a pair of leading edges arranged in both sides, and an oscillating type attraction unit 5A. An adhesive tape 27 for unreeling by cutting from a tape unreeling device 12 arranged in a lateral direction of the machine body, is wound around a circumference of the mold which is opposedly parallel or one side of which is slanted, and remains after predetermined unsetting of the holder. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a tape winding device for a plastic lens molding mother mold for spectacles, in which two mother molds are set so as to be parallel or inclined so that one side is inclined, and an adhesive tape is wound around the outer periphery of both molds. In particular, the present invention relates to a tape winding device of a mold suitable for forming a general spectacle lens or a lens with a prism prescription, particularly a progressive focus lens.

  In general, as a conventionally known method for molding a plastic lens for spectacles, a pair of disk-shaped master molds are simply opposed in parallel, and adhesive tape is wound around both outer circumferences, and a material filling gap is arranged in the middle. In this mold assembly, the material filling gap is filled with the raw material, and a plastic spectacle lens is obtained through a predetermined molding process. In this case, the winding of the adhesive tape around both molds was an inefficient and skillful work because all the work was done manually. For this reason, recently, in view of work efficiency, mechanization of setting work of at least two molds has been attempted. For example, both molds are fitted on both sides of a cylindrical mold holder to provide a material filling gap in the middle, and a pair of suction units are inserted into both molds from both sides to perform mechanical suction transfer. The holder is removed, both molds are arranged at predetermined positions, and a tape is wound around the outer periphery to form a mold assembly.

  However, the lens body for spectacles obtained through the mold assembly in which the tape is wound around both molds simply arranged in parallel as described above, the lens body remains a standard spectacle lens with the same thickness, and a lens with a prism prescription, particularly A prism such as a progressive-power lens or a lens having directionality in the axial position has not yet been obtained and has become a problem.

That is, a lens body obtained by a general plastic lens molding mold assembly includes, for example, two molds a and a having a predetermined lens curvature, as shown in A, B, C, and D of FIG. A known cylindrical mold holder (not shown) is fitted in parallel on both sides and set with a material filling gap b in the middle. Here, the mold holder is appropriately removed, only both molds are made to face each other at a predetermined position, and the adhesive tape d is wound around the outer periphery c of both the molds. Thereafter, the tape is slightly wound to inject the plastic raw material e into the material filling gap, and a plastic lens body f is obtained through a predetermined lens molding process. As an example of a mechanical winding device for an adhesive tape for both parallel molds, there is, for example, Japanese Patent Laid-Open No. 2005-238538 (matrix mold tape sticking device for plastic lens molding) previously proposed by the present applicant. .
JP 2005-238538 A

  However, the known tape wrapping device for a plastic mold for molding a plastic lens simply sets two molds in a predetermined mold holder in parallel, and both molds are not inclined. Even if the adhesive tape is wound around both molds in this state, the material filling gap only has a uniform gap over the entire circumference. Therefore, in order to obtain a progressive-power eyeglass lens or a lens having a prism prescription, it is necessary to form a thick lens and perform grinding and polishing to obtain a desired thin lens h (see B in FIG. 12). It becomes a wasteful use.

  For this reason, in order to obtain a lens with a prism prescription, for example, a progressive addition lens that performs prism thinning, one side is transferred to the final optical surface with a molding die, and the opposite surface is made thick by subsequent polishing or the like. After molding the semi-finished lens, it was necessary to obtain a predetermined plastic lens by grinding and polishing the surface side having no optical characteristics.

  Here, if the tape winding device for both molds is capable of winding the tape even when both molds are parallel or at least one side is inclined, for example, the mold for one spectacle lens or special lens is used. Focusing on the fact that if the lens body obtained through the predetermined lens molding process is tilted with a tilted shape, the finishing process can be simplified by the thickness reduced by tilting. Finally, a tape wrapping apparatus for both molds for molding a plastic lens suitable for forming a normal spectacle lens of the present invention or a custom-made spectacle lens such as a progressive lens is completed.

  That is, in the present invention, in view of the above situation, two molds are parallel or tilted on one side by using a cylindrical mold holder, both molds are tilted in a normal spectacle lens mode, or only one side is tilted in a special spectacle lens mode. An object of the present invention is to provide a tape winding apparatus for a plastic lens molding mold that solves the above-mentioned problems by using a swinging type suction unit to cope with a skein and tilting mold, and winding the tape. It is a thing.

  The present invention is a cylindrical mold holder in which two mold molds for plastic lens molding are set so as to be parallel to both side cylinder portions or facing one side so that one side is inclined, and a material filling gap is arranged between both mold molds, A fixed cradle for placing the mold holder sideways is provided in the middle of the machine, and on both sides of the machine that are on both axes of the mold holder, there are several adsorber parts that support both molds facing the mold holder. A pair of suction units having a reversible fixed shaft, wherein at least one of the suction units is a swing-type suction unit, and a tape feeding device portion is disposed beside the fixed cradle, Both molds supported by both suction units are rotated synchronously and an adhesive tape is wound around the outer periphery.

  In this case, the cylindrical mold holder includes an angle adjustment receiving plate having an inclination mechanism between an adjustment shaft portion arranged on the holder main body side and a fulcrum shaft arranged on the holder main body side orthogonal to the adjustment shaft portion in the one-side tube portion. The angle-changeable mold holder.

  In addition, the rotation body of the suction unit of one of the suction units is provided with a rotation axis origin capable of freely setting an arbitrary angular position, and the angle is determined before winding the tape for an oblique astigmatic lens whose astigmatic axis direction is not horizontal or vertical. It is a thing.

  Further, the swing mechanism of the swing-type suction unit is composed of an adsorbing body portion provided with an appropriately tilting suction head portion protruding from the rotating body portion, and three or more retractable fixed shafts protruding around the suction body portion. The mold inclination in the mold holder is maintained.

  Furthermore, the winding start position of the adhesive tape is set on an inclined fulcrum shaft in which the outer peripheral end surface of the parallel or inclined mold and the adhesive tape are in the same plane.

  Thus, the plastic lens molding mold tape winding device of the present invention has two mold holders set in parallel or inclined so that one side is inclined, a fixed cradle for placing the holder sideways, and a pair of both sides of the mold holder. The suction unit and the fixed shaft of the suction unit are guided to both sides of the mold holder placed on the fixed base by arranging the tape feeding device part on the side of the fixed base. Adsorb and support each mold set inside. In this case, both molds may be parallel or in a state where one side is inclined, and in the inclined mold, the suction unit is made to correspond to the swing-type suction unit, and the tilt is followed and maintained. However, in mold inclination, the mold holder is an angle changeable mold holder with an angle adjustment receiving plate in the cylinder, the angle adjustment receiving plate is set to an appropriate angle, and the inclined mold is moved by the swinging type adsorption unit. Adsorption transfer.

  In other words, when one side of both molds is tilted to support prism prescription, one of the two suction units is a swing-type suction unit, and the inclined surface is formed by the suction head portion and several retractable fixed shafts. To follow. In addition, in order to cope with general lens formation in which both molds are maintained in parallel, the angle adjustment receiving plate in the mold holder may be made parallel, and the swinging type adsorption unit side performs swinging operation. Don't do it. Both molds remaining after removing the predetermined mold on the fixed cradle are opposed to a predetermined width by the support of each suction unit. In this state, if both of the suction units are rotated in synchronization with each rotary drum and the adhesive tape is fed out from the lateral tape feeding device, the tape is wound around the outer periphery of both molds, so-called mold assembly.

  In addition, the two opposite molds may be arranged in parallel for forming a general spectacle lens. However, in a lens having a prism prescription, the angle of the angle adjustment receiving plate in the cylinder is set in advance on one side of the mold. Receiving the desired inclination (If necessary, the angle may be directly measured by applying a separate angle measuring device to the mold inclined surface). This inclined mold is reliably supported in combination with the suction of the suction head portion which is the swing mechanism of the suction unit and the pressing of three or more retractable fixed shafts.

  Furthermore, the rotation axis origin mechanism of the rotation axis origin sensor for determining an arbitrary angular position to be arranged on the rotation body of this adsorption unit is provided in the moving side adsorption unit or the opposed fixed side adsorption unit (swinging type adsorption unit). Also good. However, the angle setting is determined before winding the tape, and the winding start of the inclined mold is changed so that the astigmatic axis position is directed in a desired direction.

  Further, when the tapes are fed out from both molds (winding start) in a state where both molds are parallel or one side is inclined, the outer peripheral ends of the two tapes intersect on the same plane, that is, on the rotation axis of the inclined mold. By using the outer peripheral surface, both mold positions and the tape position to be fed out are aligned, and stable tape winding becomes possible.

  As described above, the apparatus for tape-wrapping two molds for molding a plastic lens according to the present invention sets both molds so that they are parallel or one side is inclined using a cylindrical mold holder, and both molds are paired with suction units. In this case, the tilting mold is determined by adjusting the angle adjustment receiving plate in the holder, so that it is possible to obtain an accurate mold tilt of, for example, 1/100 mm. In other words, the lens body obtained by making the mold interval parallel is in the form of a normal lens with both end faces parallel, and in the mold specification in which one side is inclined, prism control is possible and both surfaces of the progressive focus lens are mold transfer. This results in a thin finish lens formed on the final optical surface, which eliminates the significant grinding and polishing problems that have been encountered in the past, leading to a reduction in manufacturing costs.

  If the suction unit that supports this tilt mold is a swing-type suction unit that can move the suction head part and receive the periphery with three or more retractable fixed shafts, it can be supported with a reliable mold tilt. can do.

  Furthermore, even in the combination of an inclined mold and an upright mold, the tape winding start position is set so that at least the rotation axis of the inclined mold and the position of the adhesive tape to be fed are on the same plane (on the inclined fulcrum axis). The tape can be drawn into both molds uniformly, and the tape can be wound without wrinkles.

  Hereinafter, a tape winding apparatus for a plastic lens molding die mold according to the present invention will be described with reference to the drawings of Examples.

  FIG. 1 to FIG. 9 show an embodiment of a tape winding apparatus in which a fixed cradle is provided in the middle of the machine body and a tape feeding device part is disposed on the lateral part. 1 and 1 are provided on the opposite sides of the airframe 2 with an adsorbent body 3 at the center of the tip and three or more (three in the figure) removably fixed centering fixed shafts 4 around the adsorbent body 3. One of them (left side in the figure) is a fixed-side suction unit 5 and the other is a moving-side suction unit 6 that slides in the longitudinal direction. The moving-side suction unit 6 includes an electric slider 8 that is driven by a pulse motor 7 mounted in the lower table portion 6b. Further, the adsorbent part of the fixed-side adsorbing unit 5 is fitted with the base shaft of the adsorbent base part 5b in the rotary body part 5a formed at the center thereof, and the continuous arrangement of the adsorbent base part 5b and the adsorbing head part 5c is angle-regulated. The head swing structure 9a is combined with the retractable fixed shaft 4 to form the head swing mechanism 9, and the head swing type suction unit 5A is configured as a whole. 10 is a C-shaped fixed holder for placing a mold holder in the middle of the machine body 2 with an upper edge portion 10a arranged at the front and rear positions at a predetermined interval. The upper edge portion 10a of the fixed receiving base 10 is vertically adjusted. It is a structure corresponding to the outer shape of the mold holder that is raised and lowered by the operation of the screw 11. Reference numeral 12 denotes a tape feeding device section disposed laterally of the machine body, which is a lateral portion of the fixed cradle 10. The tape feeding device section 12 has a tape reel 13 at the top and several pass rolls 14 in the middle. The tape feeding roll 15 is provided at the lower front edge, and the ultrasonic tape cutter 16 is provided at the upper part thereof. Reference numeral 17 denotes an elevating type small roller provided at a position below the upper edge portions 10a and 10a facing the upper part of the fixed pedestal 10, and the small roller 17 is raised by a holder wall thickness obtained by removing a predetermined holder. To receive a mold.

  18 is a cylindrical mold holder (see FIG. 7) for fitting and setting two molds 19 on both side cylindrical portions 18a and 18b (see FIG. 7), and has a mold receiving step groove 20 on the inner edge of the cylindrical portion of the mold holder 18, and One cylindrical portion 18a is provided with an angle adjusting receiving plate 23 for appropriately tilting the mold to be fitted, so that the angle changeable mold holder 18A is configured as a whole. In this case, details of the support of the angle adjustment receiving plate 23 include a screw-like adjustment shaft 22 inserted perpendicularly to the holder main body 21 and a donut-shaped angle adjustment receiving plate 23 in which the tip of the adjustment shaft 22 is fitted in the same cylindrical portion. The angle adjustment receiving plate 23 itself is supported by fulcrum shafts 24 arranged opposite to both sides of the holder main body 21 orthogonal to the adjustment shaft 22, and the angle adjustment receiving plate 23 is adjusted to the adjustment shaft 22. The mold 19 that swings according to the amount of feed and overlaps the angle adjustment receiving plate 23 is set in an inclined manner. The details of the swing structure 9a of the adsorbent part of the swing type adsorbing unit 5A are, for example, circles provided on both sides of the support plate part 5d provided on both sides of the adsorbent base part 5b protruding from the rotary body 5a. The cam roller 25 is rolled by an amount corresponding to the width of the cam groove by fitting in the arc-shaped cam groove 26, and the angle of swinging movement is restricted.

  Reference numeral 29 denotes a rotation axis origin sensor serving as an origin of the rotation axis of the optical encoder type provided at a predetermined position below the rear end of the rotation body 6a of the moving-side suction unit 6, and a mold for an astigmatism lens having axial directionality. In the class, the astigmatic axis position is determined as a range from where to where. For this reason, it does not come unreasonable for synchronous rotation with the rotary body of the opposite suction unit. Of course, if necessary, the rotation axis origin sensor 29 may be disposed on the rotary body 5a of the swing type suction unit (fixed side suction unit) 5A. Reference numeral 30 denotes a cylinder portion having a chuck function provided at the base end portion of the fixed shaft 4 for supporting the mold, and is fixed or extended according to the mold surface in contact with the tip. Reference numeral 32 denotes a movable arm portion of the tape feeding roll 15 of the tape feeding device section 12.

  Next, this operation will be described. In so-called taping in which the adhesive tape 27 is wound around the outer periphery of the two disk-shaped molds 19 in molding the plastic lens, first, the two molds 19 having a predetermined lens bend are attached to the cylindrical mold holder 18. Are fitted and set on both side cylinder portions 18a and 18b. In this case, in the case of a general spectacle lens, the angle adjustment receiving plate 23 disposed in one of the cylinders is flatly used so as not to be inclined, and the opposed fitting molds 19 and 19 are parallel. Further, in a lens having a prism prescription, when the angle adjustment receiving plate 23 is appropriately tilted by the operation of the adjustment shaft 22, the mold 19 fitted and overlapped with the angle adjustment receiving plate 23 has an inclination having the inclination. . At this time, if the opposing mold 19 is set in parallel, the mold 19 is set with one side inclined. This cylindrical mold holder 18 is placed sideways on the fixed cradle 10 in the middle of the machine body, and then a pair of suction units 1 and 1 disposed on both sides of the machine body are slid and transferred to the mold. If it inserts in the cylinder of the holder 18, the mold 19 located inside will be adsorbed.

  In this state, in the mold holder 18 placed horizontally on the fixed cradle 10, the engagement that has been fitted by groove fitting or stopped by an appropriate claw engagement (not shown) is released, and the moving side suction is performed. If the unit 6 side is moved backward, the so-called holder removal is performed while the molds 19 and 19 are attracted to the respective suction unit sides. That is, the mold holder 18 is removed from the fixed cradle 10. Thereafter, if only the moving-side suction unit 6 is moved to the set position by a predetermined storage means, a predetermined material filling gap 28 is obtained between the opposing molds. At this time, if the mold 19 that is attracted to the fixed-side suction unit 5 is appropriately tilted due to the tilt of the angle adjustment receiving plate 23, an inclined gap is naturally formed in the material filling gap 28 composed of both molds 19, 19.

  Here, both molds 19 and 19 adsorbed and supported by both adsorbing units 5 and 6 are rotated synchronously with the respective rotating body portions 5a and 6a, and the tape feeding device unit 12 disposed on the lateral part of the machine body is operated, If the adhesive tape 27 fed out from the tape reel 13 is cut to an appropriate length by the ultrasonic tape cutter 16 and fed out, the tape is wound around the outer periphery of the pair of molds 19 and 19 located in front. At this time, the adhesive tape 27 is cut obliquely by the ultrasonic cutter 16, and a beautiful tape cut that does not cause dripping of the adhesive can be achieved.

  In this case, when the adhesive tape 27 is bonded to the opposing molds 19, 19 whose one side is inclined, the feeding position of the adhesive tape 27 is set to t on the fulcrum shaft of the support shaft of the inclined mold 19. Since the outer peripheral surface of 19 and the tape surface are flush with each other (see FIGS. 10A and 10B), the tape can be drawn smoothly and tape winding without causing wrinkles becomes possible.

  Thus, the material filling gap 28 formed between the molds 19 and 19 which have been tape-wrapped and assembled with the mold is inclined. Thereafter, a part of the adhesive tape 27 wound around the mold tilted on one side and a mold perpendicular to the mold is peeled off and filled with a predetermined plastic raw material e, and the adhesive tape with a part peeled off is attached again, and a predetermined lens forming step is performed. After that, the lens body 33 inclined to one side is obtained (see FIGS. 11A and 11B).

  That is, the lens body 33 obtained by assembling a mold using a mold that tilts on one side can control the prism by tilting the mold, leading to an improvement in lens finishing efficiency. Of course, as described above, in the mold setting to the mold holder, if the angle adjustment receiving plate is used flat, that is, the inclination is set to 0, a standard spectacle lens body having the same lens body thickness can be obtained.

  In the progressive focus lens cast finish molding embodiment, the inclination of the angle-changeable mold holder is set to 1 mm, the tape of the progressive power lens mold is wound using the apparatus of the embodiment, and the plastic lens is molded (polymerized). A lens mold was assembled. MR8 manufactured by Mitsui Chemicals was injected into the lens molding mold, and the temperature was raised from room temperature to 130 ° C. over 20 hours to carry out polymerization. After completion of the polymerization, the lens was taken out of the mold and subjected to heat treatment at 130 ° C. for 1 hour to produce 40 plastic lenses. The obtained plastic lens had a prism amount of 1.00Δ, and its variation was as small as ± 0.06Δ or less, thus maintaining a good lens shape.

  Fifteen plastic lenses were produced in the same manner as in Example 1 except that the inclination of the angle-changeable mold holder was set to 2 mm. The obtained plastic lens had a prism amount of 0.5Δ, and its variation was as small as ± 0.05Δ or less, thus maintaining a good lens shape.

Comparative Example 1

  A device with a fixed adsorbent part. Tape winding was performed with the mold tilted by 2 mm, but the mold on the inclined side could not be adsorbed and desired tape winding could not be performed.

  The tape winding mechanism for the mold is not limited to plastic lens molding and can be appropriately diverted as long as at least one of the pair of molds has an inclination.

It is a front view which shows the principal part of the Example of the tape winding apparatus of the mother mold for plastic lens shaping | molding of this invention. It is a perspective view which shows the principal part of the tape feeding apparatus part. It is explanatory drawing which placed between the adsorption | suction units which oppose the both sides, and mounted the cylindrical mold holder sideways on the fixed base. It is a figure which shows the fixed cradle which receives the mold holder, (A) is explanatory drawing of a principal part expansion, (B) is a side view of the principal part. It is explanatory drawing which shows the principal part of the swing type adsorption | suction unit which is the fixed side adsorption | suction unit. It is a figure which shows the principal part of the head swing mechanism, (A) is a top view, (B) is a side view, (C) is a front view. It is a figure which shows the cylindrical mold holder used as an angle change type mold holder, (A) is a front view, (B) is explanatory drawing which shows an inside, (C) is explanatory drawing which the angle adjustment receiving plate inclined, (D) is a side view showing the inside. It is explanatory drawing which shows the rotating shaft origin provided in the rear-end lower part of the rotation trunk | drum of a swing type adsorption | suction unit. It is explanatory drawing which shows the relationship between the adsorption | suction body part of an adsorption | suction unit, and the retractable fixed axis | shaft arrange | positioned to the periphery. It is description of the adhesive tape extended | stretched to both opposing molds, (A) is explanatory drawing of the mold use which one side inclines, (B) is a perspective view which shows the supply position of the adhesive tape extended to both molds. It is description which shows the material filling space | gap formed with both molds, (A) is explanatory drawing of the mold which one side inclines, (B) is explanatory drawing which shows the lens body formed with the material filling space | gap. In the explanation of a lens body using a conventional parallel mold, (A) is an explanatory diagram in which an adhesive tape is wound around a mold having a material filling gap parallel on both sides, and (B) is a material filling the material filling gap. FIG. 2C is an explanatory diagram of the formed lens body, FIG. 3C is an explanatory diagram for forming the predetermined lens body by performing required cutting or the like on the lens body, and FIG. 4D is an explanatory diagram of the finished lens body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Adsorption unit 3 Adsorber part 4 Centering support shaft 5 Fixed-side adsorption unit 5A Swing-type adsorption unit 6 Moving-side adsorption unit 9 Swing mechanism 9a Swing structure 10 Fixed receiving base 12 Tape feeding device section 15 Tape feeding roll 16 Ultrasonic Type Tape Cutter 17 Elevating Small Roller 18 Cylindrical Mold Holder 18A Angle Changeable Mold Holder 19 Mold 22 Adjusting Shaft 23 Angle Adjusting Receiving Plate 24 Supporting Point 27 Adhesive Tape 28 Material Filling Gap

Claims (5)

  A cylindrical mold holder for setting two mold molds for plastic lens so as to be parallel to both sides of the cylinder part or facing each other so that one side is inclined, and to provide a material filling gap between the two mold molds; A fixed cradle to be placed sideways is provided in the middle of the machine, and on both sides of the machine that is on both axes of the mold holder, there are an adsorber part that supports both molds facing each other in the mold holder and several retractable parts. A pair of suction units having a fixed shaft is disposed, and at least one of the suction units is a swing-type suction unit, and a tape feeding device is disposed beside the fixed cradle. A mold tape winding apparatus characterized by rotating both supported molds synchronously and winding an adhesive tape around the outer periphery.   Angle change with cylindrical mold holder equipped with angle adjustment receiving plate with tilting mechanism of adjustment shaft part arranged on the holder body side in one cylinder part and fulcrum shaft arranged on the holder body side orthogonal to the adjustment shaft part 2. The mold tape winding device according to claim 1, which is a mold holder.   2. The rotary body of one suction unit is provided with a rotation axis origin at which an arbitrary angular position can be freely set, and the angle is determined before winding the tape for an oblique astigmatic lens whose astigmatic axis direction is not horizontal or vertical. The tape winding apparatus of the mold as described.   The swing mechanism of the swing-type suction unit is a mold holder that includes an adsorbent body provided with an appropriately tilted suction head part projecting from a rotating body part and three or more retractable fixed shafts projecting around the adsorber part. 2. The mold tape winding apparatus according to claim 1, wherein the mold inclination is maintained.   2. The mold tape winding apparatus according to claim 1, wherein the winding start position of the adhesive tape is set on an inclined fulcrum shaft in which the outer peripheral end faces of both molds parallel or inclined and the adhesive tape are flush with each other.

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