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EP0305793A1 - Pencil-manufacturing process and apparatus - Google Patents

Pencil-manufacturing process and apparatus Download PDF

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Publication number
EP0305793A1
EP0305793A1 EP88113202A EP88113202A EP0305793A1 EP 0305793 A1 EP0305793 A1 EP 0305793A1 EP 88113202 A EP88113202 A EP 88113202A EP 88113202 A EP88113202 A EP 88113202A EP 0305793 A1 EP0305793 A1 EP 0305793A1
Authority
EP
European Patent Office
Prior art keywords
boards
drops
glue
marking
printing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88113202A
Other languages
German (de)
French (fr)
Other versions
EP0305793B1 (en
Inventor
Jean-Bernard Chenal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caran dAche SA
Fabrique Suisse de Crayons Caran dAche SA
Original Assignee
Caran dAche SA
Fabrique Suisse de Crayons Caran dAche SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caran dAche SA, Fabrique Suisse de Crayons Caran dAche SA filed Critical Caran dAche SA
Priority to AT88113202T priority Critical patent/ATE68416T1/en
Publication of EP0305793A1 publication Critical patent/EP0305793A1/en
Application granted granted Critical
Publication of EP0305793B1 publication Critical patent/EP0305793B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K19/00—Non-propelling pencils; Styles; Crayons; Chalks
    • B43K19/16—Making non-propelling pencils
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1062—Prior to assembly
    • Y10T156/1064—Partial cutting [e.g., grooving or incising]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/108—Flash, trim or excess removal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1082—Partial cutting bonded sandwich [e.g., grooving or incising]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing

Definitions

  • the present invention relates to the field of chain production of pencils, and more particularly to an improvement made to the process of this manufacture and to the installation for the implementation thereof.
  • the process for the continuous manufacture of pencils comprises the following main steps: - laying mines in appropriate pre-glued grooves made longitudinally in a first wooden half-board; - After application of glue, laying of a second half-board of identical shape and provided with grooves, the grooved face being also pre-glued, then put under press boards or "sandwiches" containing the mines; - pure trimming to free the ends of these boards, and cutting in the longitudinal direction, between the mines, to form the pencils.
  • this technique also has the disadvantage of not being able to be implemented automatically and of achieving an insufficient result as regards marking, since it is practically impossible to distinguish with certainty the boards marked only by a specific color, when these can be about 80 to 120 in number.
  • the object of this invention is to provide a method which makes it possible to remedy the aforementioned drawbacks, and which can be implemented entirely automatically and with a marking which is easy to carry out and then to decipher.
  • a second object of the invention consists of a device for implementing the above method, which is defined in claim 5.
  • FIG. 1 is a diagram illustrating a known production line in which the improvement according to the invention is incorporated.
  • Figure 2 is a schematic perspective view showing the arrangement of the marking devices with respect to the movement of the boards.
  • the half-boards 1 are first subjected to a longitudinal grooving operation in a grooving machine 2. Then, in a device 3, after depositing a thread of glue in each groove 5, the leads 4 are arranged in these grooves.
  • This board 1 ′ is subjected to the action of a drum-press 7 so as to securely fix the two half-boards 1 (pressure according to the arrows I).
  • the boards 1 ′ are then trimmed at their transverse ends, so as to free them and thus provide boards with sharp edges, by means of a trimmer 8 (not shown).
  • the coating and marking device 9 is arranged, which is more particularly the subject of the invention. Indeed, after the trimming operation, the boards 1 ′, continuing to advance continuously, are provided on their edges with a layer of protective paint or varnish on the one hand, and on the other hand with a marking identification may include numbers and / or coding letters.
  • One of the main aspects of this invention consists in the particular application of a newly known technology of marking by jet of liquid, for example ink, allowing printing at high speed and with high precision.
  • This technique involves the combined action of a vibrating device of the piezoelectric type and a system for pressurizing an appropriate liquid, forcing it through a nozzle of small diameter, and which leads to the '' obtaining a standardized drop train (emission frequency, diameter of the drops, jet break position).
  • the jet is broken, the drops are individually charged at variable levels, passing between electrodes brought to an adequate electrical potential.
  • the drops then pass between plates brought to a high potential where they undergo a deflection proportional to their charge and in accordance with the desired impact position.
  • a device of the aforementioned type (by example "Willet Printos” from the company Willett Sarl in Paris, or “Jaime 2000” from the company Image in Valence, France), is therefore incorporated into the installation for making pencils, after adaptation for this particular new application.
  • the coating and marking device 9 comprises two generators 12, 13 of jets of pressurized liquid, arranged one after the other. in the direction of travel of the boards 1 ′.
  • the two generators 12, 13 are controlled by a common programmable control unit 14 and are each connected to two printheads 15a, 15b; 16a, 16b, arranged in pairs on either side of the path of travel of the boards 1 ′.
  • the boards 1 ′ travel in the direction of arrow II between the print heads 15a, 15b; 16a, 16b, arranged transversely with respect to this movement on a drive device, generally of the endless type, and which may be constituted by two parallel chains or bands 17, by a single wide band, etc.
  • the boards 1 ′ are positioned on this advance device by means of stop members 18.
  • the sandwich board 1 ′ (A) after having been trimmed at its ends passes first between the heads 15a, 15b which are designed to squirt on the edges of said board 1 ′ (B) a protective base layer 19, for example a varnish.
  • the board 1 ′ (C) is provided on its edges thus coated with a marking or coding 20 (letters, numbers or combination of the two) passing between the heads 16a, 16b, which are designed to print with precision of such signs, corresponding to the hardness of the mines or to their color.
  • a marking or coding 20 letters, numbers or combination of the two
  • the whole of the protection and marking device 9 operates automatically, the control unit common to the two generators 12, 13 being programmable as a function in particular of the running speed of the boards 1 ′, the dimensions of the slices of these to be treated, the nature and characteristics (viscosity, etc.) of the respective liquids to be sprayed, etc.
  • measurement and / or detection members are provided to automatically supply the control unit with the information necessary for its operation, such as the instantaneous position of each board, the dimensions thereof. ci, etc. All these means can be incorporated into the print heads.
  • the pencil manufacturing process can be streamlined.
  • the use of jets under pressure of an appropriate liquid makes it possible to obtain a thin protective coating very quickly dry and the printing without interruption of the scrolling of the boards of marking or coding indications thereon.
  • the same liquid jet technique in the form of droplets can be used, in the continuous manufacturing process of pencils, for the prior gluing either of the grooves, or of the entire grooved surface of the two half -planks forming the "sandwich".
  • a jet device under liquid pressure for example of the type described with reference to the attached drawing, more particularly at the groover and before the drum press.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Printing Methods (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

The process for the continuous manufacture of pencils comprises the stages of arranging pencil leads between two half-boards slotted longitudinally and fixed together by adhesive bonding and pressing in order to form sandwich boards (1), of trimming the transverse ends of these boards and then of cutting the latter between the leads housed in the longitudinal slots. After having trimmed the ends of the boards in order to free them, a protective layer (19), onto which an identifying marking (20) is printed, is deposited on the faces thus formed, the depositing of the protective layer and the printing of the marking being effected by means of a device for spraying under pressure drops of a protective and printing liquid respectively, comprising spraying heads (15a, 15b; 16a, 16b). <IMAGE>

Description

La présente invention concerne le domaine de la fabrication en chaine des crayons, et plus particulièrement un perfectionnement apporté au procèdé de cette fabrication et à l'installation pour la mise en oeuvre de celui-ci.The present invention relates to the field of chain production of pencils, and more particularly to an improvement made to the process of this manufacture and to the installation for the implementation thereof.

Comme cela sera rappelé plus loin, en référence au dessin annexé, le procèdé de fabrication en continu de crayons, tel qu'il est actuellement mis en oeuvre de manière connue en soi, comprend les étapes principales suivantes :
- pose des mines dans des rainures préencollées appropriées pratiquées longitudinalement dans une première demi-planchette en bois ;
- après application de colle, pose d'une seconde demi-planchette de forme identique et pourvue de rainures, la face rainurée étant également préencollée, puis mise sous presse des planchettes ou "sandwichs" contenant les mines ;
- rognage pur affranchir les extrémités de ces planchettes, et découpage dans le sens longitudinal, entre les mines, pour former les crayons.As will be recalled below, with reference to the appended drawing, the process for the continuous manufacture of pencils, as it is currently implemented in a manner known per se, comprises the following main steps:
- laying mines in appropriate pre-glued grooves made longitudinally in a first wooden half-board;
- After application of glue, laying of a second half-board of identical shape and provided with grooves, the grooved face being also pre-glued, then put under press boards or "sandwiches" containing the mines;
- pure trimming to free the ends of these boards, and cutting in the longitudinal direction, between the mines, to form the pencils.

Ainsi, dans ce processus, une fois que la seconde demi-planchette a été posée, les mines ne sont visibles de l'extérieur que par leurs extrémités, sur les tranches transversales de ladite planchette. Or, il existe actuellement près d'une vingtaine de nuances différentes de crayons à mines noires, et une centaine de mines de couleurs différentes. Il est donc impératif de pouvoir marquer les planchettes avant le découpage final, de manière à distinguer ces différentes nuances. D'autre part, il est également nécessaire, après l'étape de rognage, d'enduire les tranches affranchies des planchettes, afin d'éviter dans l'étape finale et les manipulations subséquentes que la poussière de graphite,provenant des extrémités des mines, ne vienne salir ou endommager les installations.Thus, in this process, once the second half-board has been laid, the mines are visible from the outside only by their ends, on the transverse edges of said board. However, there are currently nearly twenty different shades of black lead pencils, and a hundred different colored leads. It is therefore imperative to be able to mark the boards before the final cutting, so as to distinguish these different shades. On the other hand, it is also necessary, after the trimming step, to coat the franked slices of the boards, in order to avoid in the final step and the subsequent manipulations that the graphite dust, coming from the ends of the mines , do not dirty or damage the installations.

Actuellement le problème précité est résolu, de manière peu satisfaisante et peu rationnelle, en interrompant la chaine de fabrication pour disposer les planchettes sur des supports adéquats afin d'appliquer une couche mince d'un vernis de couleur sur les extrémités transversales des planchettes, par exemple au moyen d'un dispositif du type pistolet à peinture.Currently the aforementioned problem is solved, in an unsatisfactory and not very rational way, by interrupting the production line to arrange the boards on suitable supports in order to apply a thin layer of a colored varnish on the transverse ends of the boards, by example using a spray gun type device.

En plus de l'inconvénient important de l'interruption du processus continu, cette technique présente en outre le désavantage de ne pas pouvoir être mise en oeuvre automatiquement et d'aboutir à un résultat insuffisant en ce qui concerne le marquage, puisqu'il est pratiquement impossible de distinguer de manière sûre les planchettes marquées uniquement par une couleur déterminée, lorsque celles-ci peuvent être au nombre d'environ 80 à 120.In addition to the significant drawback of interrupting the continuous process, this technique also has the disadvantage of not being able to be implemented automatically and of achieving an insufficient result as regards marking, since it is practically impossible to distinguish with certainty the boards marked only by a specific color, when these can be about 80 to 120 in number.

Le but de cette invention consiste à fournir un procédé qui permette de remédier aux inconvénients précités, et qui puisse être mis en oeuvre de manière entièrement automatique et avec un marquage aisé à réaliser et à déchiffrer ensuite.The object of this invention is to provide a method which makes it possible to remedy the aforementioned drawbacks, and which can be implemented entirely automatically and with a marking which is easy to carry out and then to decipher.

Le procédé de fabrication en continu de crayons, objet de cette invention, et visant à atteindre le but précité, présente les caractéristiques énoncées dans la revendication 1.The process for the continuous production of pencils which is the subject of this invention and which aims to achieve the above-mentioned object has the characteristics set out in claim 1.

D'autre part, un second objet de l'invention consiste en un dispositif pour la mise en oeuvre du procédé ci-dessus, qui est défini dans la revendication 5.On the other hand, a second object of the invention consists of a device for implementing the above method, which is defined in claim 5.

Le dessin annexé auquel la description qui suit se réfère, illustre schématiquement et à titre d'exemple l'invention.The appended drawing to which the following description refers, illustrates schematically and by way of example the invention.

La figure 1 est un schéma illustrant une chaine de fabrication connue dans laquelle est incorporé le perfectionnement selon l'invention.FIG. 1 is a diagram illustrating a known production line in which the improvement according to the invention is incorporated.

La figure 2 est une vue schématique en perspective montrant la disposition des dispositifs de marquage par rapport au défilement des planchettes.Figure 2 is a schematic perspective view showing the arrangement of the marking devices with respect to the movement of the boards.

En référence tout d'abord à la figure 1, le schéma présenté illustre les différentes étapes du processus de fabrication avec en regard à chacune de ces étapes l'avancement de la fabrication.Referring first to Figure 1, the diagram presented illustrates the different stages of the manufacturing process with regard to each of these stages the progress of manufacturing.

Les demi-planchettes 1 sont en premier lieu soumises à une opération de rainurage longitudinal dans une rainureuse 2. Puis, dans un dispositif 3, après dépôt d'un filet de colle dans chaque rainure 5, les mines 4 sont disposées dans ces rainures. Une seconde demi-planchette 1, dont la face rainurée est enduite d'une couche de colle, est ensuite posée sur la première de manière à former en 6 une planchette ou sandwich 1′ contenant les mines 4. Cette planchette 1′ est soumise à l'action d'un tambour-presse 7 de manière à fixer solidement les deux demi-planchettes 1 (pression selon les flèches I).The half-boards 1 are first subjected to a longitudinal grooving operation in a grooving machine 2. Then, in a device 3, after depositing a thread of glue in each groove 5, the leads 4 are arranged in these grooves. A second half-board 1, the grooved face of which is coated with a layer of adhesive, is then placed on the first so as to form in 6 a board or sandwich 1 ′ containing the leads 4. This board 1 ′ is subjected to the action of a drum-press 7 so as to securely fix the two half-boards 1 (pressure according to the arrows I).

Les planchettes 1′ sont alors rognées à leurs extrémités transversales, de manière à affranchir celles-ci et fournir ainsi des planchettes avec des tranches nettes, au moyen d'une rogneuse 8 (non illustrée).The boards 1 ′ are then trimmed at their transverse ends, so as to free them and thus provide boards with sharp edges, by means of a trimmer 8 (not shown).

C'est à ce stade du processus de fabrication qu'est disposé le dispositif de revêtement et de marquage 9, qui fait plus particulièrement l'objet de l'invention. En effet, après l'opération de rognage, les planchettes 1′, continuant d'avancer en continu, sont munies sur leurs tranches d'une part d'une couche de peinture ou vernis protecteur, et d'autre part d'un marquage d'identification pouvant comporter des chiffres et/ou des lettres de codage.It is at this stage of the manufacturing process that the coating and marking device 9 is arranged, which is more particularly the subject of the invention. Indeed, after the trimming operation, the boards 1 ′, continuing to advance continuously, are provided on their edges with a layer of protective paint or varnish on the one hand, and on the other hand with a marking identification may include numbers and / or coding letters.

Enfin, les planchettes 1′ ainsi protégées et marquées sont amenées dans un découpeur 10, dans lequel elles sont découpées longitudinalement entre les mines 4 pour former les crayons 11, par exemple de section hexagonale.Finally, the boards 1 ′ thus protected and marked are brought into a cutter 10, in which they are cut longitudinally between the leads 4 to form the rods 11, for example of hexagonal section.

Un des principaux aspects de cette invention consiste dans l'application particulière d'une technologie nouvellement connue de marquage par jet de liquide, par exemple d'encre, permettant l'impression à grande vitesse et avec une haute précision. Cette technique fait intervenir l'action conjuguée d'un dispositif vibratoire du type piézoélectrique et d'un système de mise en pression d'un liquide approprié, forçant celui-ci au travers d'un ajutage de faible diamètre, et qui conduit à l'obtention d'un train de gouttes normalisé (fréquence d'émission, diamètre des gouttes, position de brisure du jet). A la brisure du jet, les gouttes sont individuellement chargées à des niveaux variables en passant entre des électrodes portées à un potentiel électrique adéquat. Les gouttes passent ensuite entre des plaques portées à un fort potentiel où elles subissent une déviation proportionnelle à leur charge et conforme à la position d'impact recherchée.One of the main aspects of this invention consists in the particular application of a newly known technology of marking by jet of liquid, for example ink, allowing printing at high speed and with high precision. This technique involves the combined action of a vibrating device of the piezoelectric type and a system for pressurizing an appropriate liquid, forcing it through a nozzle of small diameter, and which leads to the '' obtaining a standardized drop train (emission frequency, diameter of the drops, jet break position). When the jet is broken, the drops are individually charged at variable levels, passing between electrodes brought to an adequate electrical potential. The drops then pass between plates brought to a high potential where they undergo a deflection proportional to their charge and in accordance with the desired impact position.

Un dispositif du type précité (par exemple "Willet Printos" de la société Willett Sarl à Paris, ou "Jaime 2000" de la société Image à Valence, France), est donc incorporé à l'installation de fabrication des crayons, après adaptation en vue de cette application particulière nouvelle.A device of the aforementioned type (by example "Willet Printos" from the company Willett Sarl in Paris, or "Jaime 2000" from the company Image in Valence, France), is therefore incorporated into the installation for making pencils, after adaptation for this particular new application.

Comme présenté sur le schéma de la figure 1, et plus en détail sur celui de la figure 2, le dispositif de revêtement et de marquage 9 comporte deux générateurs 12,13 de jets de liquide sous pression, disposés l'un après l'autre dans le sens de défilement des planchettes 1′. Les deux générateurs 12,13 sont commandés par une unité de commande programmable commune 14 et sont reliés chacun à deux têtes d'impression 15a, 15b ; 16a, 16b, disposés par paire de part et d'autre du chemin de défilement des planchettes 1′.As shown in the diagram in FIG. 1, and in more detail in that of FIG. 2, the coating and marking device 9 comprises two generators 12, 13 of jets of pressurized liquid, arranged one after the other. in the direction of travel of the boards 1 ′. The two generators 12, 13 are controlled by a common programmable control unit 14 and are each connected to two printheads 15a, 15b; 16a, 16b, arranged in pairs on either side of the path of travel of the boards 1 ′.

Comme illustré sur la figure 2, les planchettes 1′ défilent dans le sens de la flèche II entre les têtes d'impression 15a, 15b ; 16a, 16b, disposées transversalement par rapport à ce défilement sur un dispositif d'entraînement, en général du type sans fin, et pouvant être constitué par deux chaines ou bandes parallèles 17, par une bande large unique, etc. Les planchettes 1′ sont positionnées sur ce dispositif d'avance grâce à des organes d'arrêt 18. La planchette sandwich 1′(A) après avoir été rognée à ses extrémités passe tout d'abord entre les têtes 15a, 15b qui sont conçues pour gicler sur les tranches de ladite planchette 1′(B) une couche de fond protectrice 19, par exemple un vernis. Puis, la planchette 1′(C) est munie sur ses tranches ainsi revêtues d'un marquage ou codage 20 (lettres, chiffres ou combinaison des deux) en passant entre les têtes 16a, 16b, qui sont conçues, elles, pour imprimer avec précision de tels signes, correspondant à la dureté des mines ou à la couleur de celles-ci. Ces têtes 16a, 16b projettent donc de préférence une encre d'impression.As illustrated in FIG. 2, the boards 1 ′ travel in the direction of arrow II between the print heads 15a, 15b; 16a, 16b, arranged transversely with respect to this movement on a drive device, generally of the endless type, and which may be constituted by two parallel chains or bands 17, by a single wide band, etc. The boards 1 ′ are positioned on this advance device by means of stop members 18. The sandwich board 1 ′ (A) after having been trimmed at its ends passes first between the heads 15a, 15b which are designed to squirt on the edges of said board 1 ′ (B) a protective base layer 19, for example a varnish. Then, the board 1 ′ (C) is provided on its edges thus coated with a marking or coding 20 (letters, numbers or combination of the two) passing between the heads 16a, 16b, which are designed to print with precision of such signs, corresponding to the hardness of the mines or to their color. These heads 16a, 16b therefore preferably project a printing ink.

Bien entendu, l'ensemble du dispositif de protection et de marquage 9 fonctionne automatiquement, l'unité de commande commune 14 aux deux générateurs 12,13 étant programmable en fonction notamment de la vitesse de défilement des planchettes 1′, des dimensions des tranches de celles-ci à traiter, de la nature et des caractéristiques (viscosité, etc) des liquides respectifs à projeter, etc. D'autre part, des organes de mesure et/ou de détection (non montrés) sont prévus pour fournir automatiquement à l'unité de commande les informations nécessaires à son fonctionnement, telles que la position instantanée de chaque planchette, les dimensions de celles-ci, etc. Tous ces moyens peuvent être incorporés de fabrication aux têtes d'impression.Of course, the whole of the protection and marking device 9 operates automatically, the control unit common to the two generators 12, 13 being programmable as a function in particular of the running speed of the boards 1 ′, the dimensions of the slices of these to be treated, the nature and characteristics (viscosity, etc.) of the respective liquids to be sprayed, etc. On the other hand, measurement and / or detection members (not shown) are provided to automatically supply the control unit with the information necessary for its operation, such as the instantaneous position of each board, the dimensions thereof. ci, etc. All these means can be incorporated into the print heads.

Ainsi grâce à cette application originale d'une nouvelle technique, le processus de fabrication des crayons peut être rationalisé. L'utilisation de jets sous pression d'un liquide approprié permet d'obtenir un revêtement mince de protection très rapidement sec et l'impression sans interruption du défilement des planchettes d'indications de marquage ou de codage sur celles-ci.Thanks to this original application of a new technique, the pencil manufacturing process can be streamlined. The use of jets under pressure of an appropriate liquid makes it possible to obtain a thin protective coating very quickly dry and the printing without interruption of the scrolling of the boards of marking or coding indications thereon.

D'autre part, la même technique de jet de liquide sous forme de gouttelettes peut être utilisée, dans le procédé de fabrication en continu de crayons, pour l'encollage préalable soit des rainures, soit de la totalité de la surface rainurée des deux demi-planchettes formant le "sandwich". Dans ce cas, il convient donc d'incorporer dans l'installation pour la mise en oeuvre du procédé, un dispositif de jet sous pression de liquide par exemple du type de celui décrit en référence au dessin annexé, plus particulièrement au niveau de la rainureuse et avant le tambour-presse. On pourra ainsi disposer un générateur avec tête d'éjection de colle liquide sous forme de gouttelettes calibrées afin de déposer dans chaque rainure des demi-planchettes, avant la mise en place des mines, un filet de colle ; le cas échéant, un second générateur avec tête d'éjection sera disposé de manière à revêtir d'une couche de colle la surface rainurée des autres demi-planchettes avant la formation des sandwichs par pressage. Cette variante supplémentaire permet de rationaliser encore plus le procédé de fabrication et surtout d'assurer une meilleure qualité aux crayons ainsi fabriqués, notamment grâce à la possibilité de garantir le dépôt de colle dans chaque rainure destinée à recevoir une mine, ce qui n'est pas le cas avec les techniques actuellement utilisées.On the other hand, the same liquid jet technique in the form of droplets can be used, in the continuous manufacturing process of pencils, for the prior gluing either of the grooves, or of the entire grooved surface of the two half -planks forming the "sandwich". In this case, it is therefore necessary to incorporate into the installation for the implementation of the method, a jet device under liquid pressure, for example of the type described with reference to the attached drawing, more particularly at the groover and before the drum press. It will thus be possible to have a generator with a head for ejecting liquid glue in the form of calibrated droplets in order to deposit in each groove half-boards, before the placement of the mines, a thread of glue; if necessary, a second generator with ejection head will be arranged so as to coat with a layer of glue the grooved surface of the other half-boards before the sandwiches are formed by pressing. This additional variant makes it possible to further rationalize the manufacturing process and above all to ensure better quality of the pencils thus manufactured, in particular thanks to the possibility of guaranteeing the deposition of glue in each groove intended to receive a lead, which is not not the case with the techniques currently used.

Claims (9)

1. Procédé pour la fabrication en continu de crayons, comportant les étapes de disposer des mines de crayons entre deux demi-planchettes rainurées longitudinalement et fixées entre elles par collage et pressage pour former des planchettes-sandwichs, de rogner les extrémités transversales de ces planchettes, puis de découper celles-ci entre les mines logées dans les rainures longitudinales, caractérisé par le fait qu'après avoir rogné lesdites extrémités pour les affranchir, on dépose sur les tranches ainsi formées une couche de protection sur laquelle on imprime un marquage d'identification, le dépôt de la couche de protection et l'impression du marquage étant effectué par jet sous pression de gouttes d'un liquide de protection, respectivement d'impression.1. Process for the continuous manufacture of pencils, comprising the steps of placing the pencil leads between two longitudinally grooved half-boards and fixed together by gluing and pressing to form sandwich boards, trimming the transverse ends of these boards , then to cut these between the mines housed in the longitudinal grooves, characterized in that after having cut off said ends to free them, a protective layer is deposited on the slices thus formed on which a marking of identification, the deposition of the protective layer and the printing of the marking being effected by jet pressure of drops of a protective liquid, respectively printing. 2. Procédé selon la revendication 1, caractérisé par le fait qu'entre les étapes du rognage et du découpage on fait défiler les planchettes, avec leur axe longitudinal perpendiculaire à la direction du défilement, entre deux paires de têtes de giclage disposées l'une après l'autre dans le sens du défilement, la première paire étant destinée à la projection de gouttes d'un liquide de protection et la seconde à la projection de gouttes d'une encre d'impression, chaque paire étant reliée à un générateur piézoélectrique et de mise sous pression du liquide de protection respectivement d'impression, et les deux générateurs étant commandés par une unité de commande programmable.2. Method according to claim 1, characterized in that between the stages of trimming and cutting the boards are scrolled, with their longitudinal axis perpendicular to the direction of travel, between two pairs of spray heads arranged one after the other in the direction of travel, the first pair being intended for the projection of drops of a protective liquid and the second for the projection of drops of a printing ink, each pair being connected to a piezoelectric generator and pressurizing the printing protective fluid respectively, and the two generators being controlled by a programmable control unit. 3. Procèdé selon la revendication 1 ou la revendication 2, caractérisé par le fait que, préalablement à la mise en place des mines dans les rainures des demi-planchettes, on dépose dans ces rainures un filet de colle par jet sous pression de gouttes de colle liquide.3. Method according to claim 1 or the Claim 2, characterized in that, prior to the placement of the mines in the grooves of the half-boards, a net of glue is deposited in these grooves by jet under pressure of drops of liquid glue. 4. Procédé selon l'une des revendications 1 à 3, caractérisé par le fait qu'on dépose une couche de colle sur la surface rainurée des demi-planchettes avant la formation des planchettes-sandwichs par pressage, par jet sous pression de gouttes de colle liquide.4. Method according to one of claims 1 to 3, characterized in that a layer of adhesive is deposited on the grooved surface of the half-boards before the formation of the sandwich boards by pressing, by pressure jet of drops of liquid glue. 5. Installation pour la mise en oeuvre du procédé selon la revendication 1 comportant, disposés en suivant pour former une chaine de fabrication, une rainureuse, un dispositif de pose des mines et d'encollage, un tambour-presse, une rogneuse et un découpeur, un dispositif de revêtement et de marquage étant disposés entre ces deux derniers éléments de l'installation.5. Installation for the implementation of the method according to claim 1 comprising, arranged in sequence to form a production line, a groover, a device for laying mines and gluing, a drum press, a trimmer and a cutter , a coating and marking device being arranged between these last two elements of the installation. 6. Installation selon la revendication 5, caractérisé par le fait que le dispositif de revêtement et de marquage comporte une unité de commande programmable reliée à deux générateurs piézoélectriques et de mise sous pression d'un liquide de protection respectivement d'impression, chaque générateur étant relié à une paire de têtes de giclage, ces têtes de giclage étant disposées de part et d'autre du chemin de défilement des planchettes.6. Installation according to claim 5, characterized in that the coating and marking device comprises a programmable control unit connected to two piezoelectric generators and pressurizing a protective liquid respectively printing, each generator being connected to a pair of spray heads, these spray heads being arranged on either side of the travel path of the boards. 7. Installation selon la revendication 6, caracterisée par le fait qu'elle comporte des moyens de mesure et/ou de détection pour fournir à l'unité de commande les informations nécessaires à son fonctionnement.7. Installation according to claim 6, characterized in that it comprises measuring and / or detection means for supplying the control unit with the information necessary for its operation. 8. Installation selon l'une des revendications 5 à 7 pour la mise en oeuvre du procédé selon la revendication 3, caractérisé par le fait qu'elle comporte un dispositif de giclage sous pression de gouttes de colle liquide situé entre la rainureuse et le dispositif de pose des mines, de manière à déposer dans chacune des rainures des demi-planchettes un filet de colle.8. Installation according to one of claims 5 to 7 for the implementation of the method according to claim 3, characterized in that it comprises a device for spraying under pressure of drops of liquid glue situated between the groover and the device for laying mines, so as to place a drop of glue in each of the grooves of the half-boards. 9. Installation selon l'une des revendications 5 à 7 pour la mise en oeuvre du procédé selon la revendication 4, caractérisé par le fait qu'elle comporte un dispositif de giclage sous pression de gouttes de colle liquide situé avant le tambour-presse, de manière à déposer une couche de colle sur la surface rainurée des demi-planchettes.9. Installation according to one of claims 5 to 7 for implementing the method according to claim 4, characterized in that it comprises a device for spraying under pressure drops of liquid glue situated before the press drum, so as to deposit a layer of glue on the grooved surface of the half-boards.
EP88113202A 1987-09-04 1988-08-13 Pencil-manufacturing process and apparatus Expired - Lifetime EP0305793B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88113202T ATE68416T1 (en) 1987-09-04 1988-08-13 PROCESS AND APPARATUS FOR THE MANUFACTURE OF PENCILS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3415/87 1987-09-04
CH3415/87A CH672613A5 (en) 1987-09-04 1987-09-04

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EP0305793A1 true EP0305793A1 (en) 1989-03-08
EP0305793B1 EP0305793B1 (en) 1991-10-16

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US (1) US4897142A (en)
EP (1) EP0305793B1 (en)
JP (1) JP2534108B2 (en)
AT (1) ATE68416T1 (en)
CH (1) CH672613A5 (en)
DE (2) DE305793T1 (en)

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CN110154583A (en) * 2019-05-29 2019-08-23 安硕文教用品（上海）股份有限公司 The one-stop production procedure of Wood-bar pencil
CN112810354A (en) * 2021-02-06 2021-05-18 黑龙江省小书童笔业有限公司 Rubber pen and manufacturing method thereof

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US20060147252A1 (en) * 2005-01-03 2006-07-06 Kathleen Torrell Liquid graphite pencil
US7951236B2 (en) * 2005-04-16 2011-05-31 Jakks Pacific, Inc. Liquid graphite
EP2689938B1 (en) * 2012-07-27 2015-09-09 Faber- Castell AG Method for producing pens in wood casings
CN112158006B (en) * 2020-10-10 2022-01-11 浙江彭胜文教用品股份有限公司 Plastic pencil and production process thereof
CN112810355A (en) * 2021-02-06 2021-05-18 黑龙江省小书童笔业有限公司 Manufacturing method of finger-jointed pencil and finger-jointed pencil

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CN112810354A (en) * 2021-02-06 2021-05-18 黑龙江省小书童笔业有限公司 Rubber pen and manufacturing method thereof

Also Published As

Publication number Publication date
JPS6471799A (en) 1989-03-16
US4897142A (en) 1990-01-30
JP2534108B2 (en) 1996-09-11
EP0305793B1 (en) 1991-10-16
DE3865605D1 (en) 1991-11-21
ATE68416T1 (en) 1991-11-15
DE305793T1 (en) 1989-06-22
CH672613A5 (en) 1989-12-15

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