US3903334A - Method for capping the ends of pencils - Google Patents

Method for capping the ends of pencils Download PDF

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Publication number
US3903334A
US3903334A US457255A US45725574A US3903334A US 3903334 A US3903334 A US 3903334A US 457255 A US457255 A US 457255A US 45725574 A US45725574 A US 45725574A US 3903334 A US3903334 A US 3903334A
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US
United States
Prior art keywords
pencils
thermoplastic material
pencil
capping
application
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.)
Expired - Lifetime
Application number
US457255A
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English (en)
Inventor
Eric Reinhard
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.)
Fabrique Suisse de Crayons Caran dAche SA
Original Assignee
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 Fabrique Suisse de Crayons Caran dAche SA filed Critical Fabrique Suisse de Crayons Caran dAche SA
Application granted granted Critical
Publication of US3903334A publication Critical patent/US3903334A/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

Definitions

  • ABSTRACT A method for capping the rear ends of pencils according to which a single operation is required, that is an application, preferably through steeping, of a molten thermoplastic material onto said ends.
  • An advantageous arrangement for executing such a method consists in means loading successive rows of pencils onto a horizontal plane in a rotary carrier, said carrier revolving stepwise so as to bring the successive rows into a predetermined, preferably vertical, position in which the'application of the thermoplastic material may be executed for instance by raising transiently a vat filled with such a material into engagement with the pencil ends, the material thereafter being allowed to set before the pencils enter a further position from which they are removed.
  • the invention has for its object a method for capping or coating the rear of a pencil, that is the end opposed to the writing tip and also an arrangement for executing said method.
  • the present invention covers a simple capping method adapted to eliminate the above mentioned drawbacks of prior technique. This is achieved according to the invention by a single application over the rear end of the pencil of a molten thermoplastic material. The hardening or setting of said material is accomplished by a rapid cooling step, which lasts only a few seconds. The entire capping operation is thus completed within a very short time.
  • thermoplastic material is applied at a temperature slightly above its melting temperature and this thermoplastic material may be applied through immersion of the pencil or through any other suitable means.
  • the present invention also covers an arrangement for carrying out the above-disclosed method, the novel feature of which arrangement consists in that it includes means for loading the pencils into a movable carrier and holding them in a vertical position on the latter and includes further means for applying the thermoplastic material onto the pencil ends.
  • FIG. 1 illustrates diagrammatically such an arrangement comprising an automatic machine for the capping of pencil ends at a raised temperature.
  • a machine includes a loading station provided with a feed hopper l carrying the pencils to be capped. Over the flat bottom of the hopper, pusher members 2 are adapted to slide to thereby urge successive rows of pencils 3 lying on said bottom into a loading drum 4 adapted to revolve round a transverse horizontal axis.
  • Said drum has radial slots such as 5 associated with pencil-holding means which allow the pencils to form successive radially directed rows.
  • Said drum 4 is rotatedly driven by a motor which is not illustrated, so as to revolve stepwise in the direction of the arrow f.
  • the arrangement also includes means 6 ensuring an accurate alignment of the pencils in their respective rows and a steeping station 7 comprising a constant level steeping vat capable of a vertical reciprocation of an unvarrying length.
  • the vats are of an overflow type and are controlled by a temperature regulator 8.
  • the arrangement still further includes pencildischarging means 9. 7
  • the capping product comprises a hot-melt composition of thermoplastic resins which is caused to melt in the heated double vat forming the steeping station.
  • the reciprocatory travel of the double vat and the level therein as defined by an overflow are constant while the excess of capping material is recovered in a large vat and recycled.
  • the shape of the capping and the weight of material applied depend, on the one hand, on the speed of the steeping operation and, on the other hand, on the adjustment of the temperature of the molten material.
  • a heating system keeps the capping hot-melt material in its fluid condition and its temperature is controlled and stabilized at the desired value by suitable means which are not illustrated.
  • a modification in the temperature of the hot-melt changes its viscosity and consequently the amount of material applied over each pencil end.
  • the hot-melts require a temperature ranging between and 280C for the material which is to be considered nowadays; however, these temperatures are by no means binding and, according to their nature, a range of viscosity of 1600 to 4300 cp can be obtained for temperatures between 149 and 191C in the case of certain known products.
  • the cap formed over the end of the pencil may be transparent, but it is possible to incorporate a pigment with the thermoplastic material, so as to obtain a colored cap.
  • the pencil is held in a substantially vertical position so that the thermoplastic material may assume a convex shape although it is applied over the flat transverse end surface of the pencil. This improves the appearance of the pencil without it being necessary to resort to the conventional step which consists in shaping the end of the pencil in order to make it assume a convex shape.
  • the pencils 3, which have thus been capped at a raised temperature, are discharged horizontally out of the drum at the discharging station 9 whence they drop onto a conveyor belt 10 which carries them towards a container 1 l or towards a further machine, which is not illustrated.
  • the pencils may also be discharged through the upper part of the drum 4.
  • the hot-steeping or capping method thus shows, over conventional methods, large and important advantages. It requires, in fact, a single operative step resorting to a single product while a single plant is used which incorporates all the operative stations corresponding to the loading, alignment, steeping and discharging steps.
  • capping material considerably simplifies the present method, as compared with conventional methods.
  • the latter require, in fact, the application of two varnishes in succession with substantial drying periods after each application.
  • the novel above-described method eliminates these drying methods.
  • the example described relates to the steeping in a bath of thermoplastic material.
  • the improved method may resort as well to other techniques such, for instance, as the projection of thermoplastic material or else a molding or the like technique.
  • a method for capping the ends of pencils opposed to their writing tips consisting in urging the pencils bodily into a position wherein said ends lie on a common line, applying in a single stage a molten thermoplastic material onto said ends and allowing said material thus applied to set.
  • thermoplastic material ranges between and 300C.
  • thermoplastic material is performed through steeping of the pencil ends in a bath of said material.
  • thermoplastic material is performed through projection of the molten thermoplastic material onto the pencil ends.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Cosmetics (AREA)
US457255A 1973-04-12 1974-04-02 Method for capping the ends of pencils Expired - Lifetime US3903334A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH522973A CH562702A5 (ja) 1973-04-12 1973-04-12

Publications (1)

Publication Number Publication Date
US3903334A true US3903334A (en) 1975-09-02

Family

ID=4290104

Family Applications (1)

Application Number Title Priority Date Filing Date
US457255A Expired - Lifetime US3903334A (en) 1973-04-12 1974-04-02 Method for capping the ends of pencils

Country Status (5)

Country Link
US (1) US3903334A (ja)
JP (1) JPS50925A (ja)
CH (1) CH562702A5 (ja)
DE (1) DE2416327A1 (ja)
FR (1) FR2233160B3 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103213427A (zh) * 2013-05-07 2013-07-24 烟台盖恩机械设备有限公司 一种全自动笔板胶板机

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5843280B2 (ja) * 1975-12-31 1983-09-26 三菱鉛筆株式会社 エンピツジクトウヘノ ジドウキヤツプツキキ
JPS5937806B2 (ja) * 1977-06-22 1984-09-12 マミヤ光機株式会社 電動ワインダ制御スイツチ機構
US5735622A (en) * 1995-12-14 1998-04-07 Pentech International Inc. Writing instrument with a compressible friction coating and method of making

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2355278A (en) * 1941-04-16 1944-08-08 Ascote Inc Apparatus for coating or saturating material
US2774398A (en) * 1951-03-05 1956-12-18 Coats & Clark Method of producing plastic rim spools

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2355278A (en) * 1941-04-16 1944-08-08 Ascote Inc Apparatus for coating or saturating material
US2774398A (en) * 1951-03-05 1956-12-18 Coats & Clark Method of producing plastic rim spools

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103213427A (zh) * 2013-05-07 2013-07-24 烟台盖恩机械设备有限公司 一种全自动笔板胶板机

Also Published As

Publication number Publication date
JPS50925A (ja) 1975-01-08
FR2233160A1 (ja) 1975-01-10
CH562702A5 (ja) 1975-06-13
DE2416327A1 (de) 1974-10-31
FR2233160B3 (ja) 1977-01-07

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