US2259959A - Machine and method for making paper-wrapped pencils - Google Patents

Machine and method for making paper-wrapped pencils Download PDF

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Publication number
US2259959A
US2259959A US369789A US36978940A US2259959A US 2259959 A US2259959 A US 2259959A US 369789 A US369789 A US 369789A US 36978940 A US36978940 A US 36978940A US 2259959 A US2259959 A US 2259959A
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US
United States
Prior art keywords
core
paper
web
wrapper
pocket
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
US369789A
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English (en)
Inventor
Miller Kay
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.)
Joseph Dixon Crucible Co
Original Assignee
Joseph Dixon Crucible Co
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 Joseph Dixon Crucible Co filed Critical Joseph Dixon Crucible Co
Priority to US369789A priority Critical patent/US2259959A/en
Application granted granted Critical
Publication of US2259959A publication Critical patent/US2259959A/en
Priority to GB14809/47A priority patent/GB635498A/en
Priority to FR953233D priority patent/FR953233A/fr
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

  • the invention relates to an improved machine for and a novel method of wrapping a straight, elongated implement in a sheath composed of a spiral of flexible material, the coils of which are inseparably secured together. More particularly, the invention is an improvement in machines and methods for making paper wrapped pencils, having a core of fragile marking material, such as graphite or the like, enclosed in a substantially homogeneous sheath composed of coiled paper, with the convolutions of the paper inseparably glued together.
  • fragile marking material such as graphite or the like
  • One object of the invention is to provide a machine of this character by which the fragile, elongated core of marking'materlal may be rapidly enclosed, without liability of breakage, in a sheath composed of alternate coils of paper and glue, so tightly wound together that the paper and glue constitute a substantially homogeneous body so as to be amenable to cutting by a knife or mechanical rotary pencil Sharpener.
  • a further object of the invention is the provision of' a novel method of wrapping tightly around a fragile elongated core without liability of breakage successive alternate coils of paper and glue so as to produce a sheath in which the successive coils of paper are substantially in contact with each other whereby there results a substantially homogeneous body resembling high grade Wood commonly used as pencil sheaths.
  • FIG. 1 is a top plan view of the pencil wrapping machine
  • Fig. 2 is a front side elevation of the parts shown in Fig. 1
  • Fig. 3 is a longitudinal, vertical section taken on the line 3-3 of Fig. 1
  • Fig. 4 is a detail of the right hand end of the parts shown in Fig. 3, but showing the core wrapping members in a different position of operation
  • Fig. 5 is a longitudinal section taken on the line 5--5 of Fig. 4
  • Fig. 6 is a detail section of the lower portion of the parts shownin Fig.
  • FIG. 7 is a detail of the lower portion of the parts shown in Fig. 6, but showing the position of the parts after the shoe Y has pressed the wrapper against the lower wrapping drum, a pencil core having been fed into the machine and the wrapper advanced to the core;
  • Fig. 8 is a horizontal section on an enlarged scale, taken on the line 8-8 of Fig. 3;
  • Fig. 9 is a transverse section on an enlarged scale, taken on the line 9-9 of Fig. 4, through the paper cutting blades;
  • Fig. 10 is a detail section similar to Fig.
  • FIG. 11 is a view similar to Fig. 10, but showing the position of the wrapping members when the forward end of the wrapper has been coiled once around the core
  • Fig. 12 is a view similar to Figs. 10 and 11, but showing the position of the wrapping members at the completion of the core wrapping operation
  • Fig. 13 is a view similar to Fig. 12, but showing the completely wrapped core in the act of being discharged from the wrapping members
  • 'and Figs. 14, 15 and 16 are enlarged details taken from Figs. 10, 11 and 12, respectively, to show more clearly the successive steps in the coiling of the wrapper around the core.
  • the improved pencil wrapping machine comprises an upper roll or drum 20 and a lower roll or drum 2
  • are somewhat longer than the pencil core or other straight, elongated implement, indicated at 22, to be wrapped in a plurality vof convolutions of alternate layers of paper and glue or other adhesive.
  • the wrapping of the core is performed by the drums 20 and 2
  • the sheath to be formedaround the core consists of a strip of suitable, flexible material 25, such as paper, coiled spirally around the core with interposed spirals of glue taken from a glue supply 26 contained in a tank 2l.
  • the strip of paper 25 is fed into the machine from a convenient-source by means of the paper advancing rolls 29 and 30.
  • the paper is-cut by the rotatable cutter 3
  • the length of paper constituting the wrapper to be coiledyabout the pencil core 22 is fed down to a position above the lower drum 2
  • the advancing forward end of the paper wrapper may, or may not, depending on the flexibility of the paper, fall downwardly onto the upper surface of the lower drum 2 But in either case, when the requisite length paper has been fed into the machine and is in the act of being cut by the rotatable blade 3
  • a bail 28 is swung in counter-clockwise direction to draw the web tightly about the lower drum 2
  • the bail is then swung out of the way and the pocket assumes the condition shown in Fig. 6, ready to receive the pencil core 22.
  • an elongated pocket closing blade 31 is swung against the web 24 just above the core 22 so as to fold the web loop 34 about the forward advancing edge of the paper wrapper and the core, as indicated clearly in Figs. and 14.
  • the pocket closing position of the blade 31 is fixed, and the space between the upper section of the web 24 and the wrapper 25 adhering to the portion of the web in contact with the lower drum 2l is just suicient to permit the paper 25 to pass between the two sections of the web during the wrapping of the paper around the core.
  • a glue displacer or raiser in the form of an elongated rectangular box 38 descends into the supply of glue 26 and raises the level 39 thereof above the pocket 34 enclosing the core 22 and the portion of the paper being wrapped around it, so that throughout the core wrapping operation, the successive layers or coils of paper have glue applied to both sides thereof.
  • the paper preferably partially charred newsprint, being porous and the pocket 34 enclosing the core 22 and the spirals of paper wound around it, being as tight as it is possible physically to tighten the web 24, it will be understood that all surplus glue is squeezed out from between the successive coils or spirals of the paper and that the glue left between them is that which sinks into the pores of the paper and a hardly perceptible coating on the surface of the paper, with the result that there is substantially only a paper to paper contact in the successive coils or spirals of paper, it being understood, of course, that the glue left on the surface of the paper is just sumcient to cause the coils to inseparably adhere together.
  • the tight closing of the web and the coiling of the paper wrapper about the core is accomplished by the travel of the web 24 from the drum 2
  • the web 24 by means of which the paper Wrapper 25 is wound or coiled tightly around the fragile pencil core 22 is preferably composed of a flexible material capable of being formed into a. loop small enough to engage snugly therelatively small pencil core and a single coil of paper, as shown in Figs. 14 and 15. It is essential, however, that the frictional engagement between the glue-covered paper and the pencil core be greater than the friction between the paper and the web 24 so that when the advancing forward edge of the paper during the travel of the web on the lower drum and around the core reaches the point (Fig. 14) where the web leaves the core, the paper remain in adherence with the core rather than with the web. This mode of operation is secured by choosing the proper material for the web, such as a good quality of duck fabric.
  • the blade 31 maintains a fixed relation to the lower drum 2 I, leaving only enough opening into the pocket 34 to permit the paper to enter the pocket while preventing the exit of the core therefrom during the winding operation which is carried out by keeping the pocket tight upon the paper by the upper drum pulling the web from the lower drum, which is put under a retarding brake pressure as soon as the blade 31 closes the pocket.
  • the loop or pocket must grow in size to accommodate itself to the growing sheath; all as clearly shown in Figs. 14 to 16.
  • the web must not stretch longitudinally and contract laterally during the wrapping operation since this action might result in the formation of wrinkles in the web and in the paper.
  • the web beingcomposed of textile fabric is necessarilyslightly stretchable, I therefore put the web under somewhat greater pulling force as the pocket is being closed upon the core and before the first coil of paper is completely around the core than is exerted during the wrapping operation. 'I'his action results in a prestretching of the web, so that it will remain at the same width during the building up of the sheath.
  • the core wrapping elements and their actuating mechanism are mounted on a frame consisting of two vertical, longitudinally extending walls, a front side wall 44 and a rear side wall 45.
  • the upper drum 20 is journaled at its ends in uprights 4B and 41 rising from the frame walls 44 and 45, respectively.
  • a sprocket 49 over which passes a chain 50, one end of which extends downwardly and carries at its extremity a counterweight 5
  • the other end of the chain 50 is pivotally connected with the upper end of an arm 52, the hub 48 of which is pivoted on a rod 53 fixed at its outer ends in the frame extensions 54 and 55.
  • the arm 52 carries a cam roll 51 which is held against the Working periphery of a cam 58 by means of the counterweight 5
  • 'I'he cam 58 is secured to a cam shaft 59 journaled at its ends in the frame extensions 54 and 55, and the rear projecting end of the cam shaft 59 carries a worm gear 68 driven by a worm 6
  • the cam shaft 59 is driven in constant rotation by means of the motor 62.
  • is iixedly mounted at one end on a shaft 64 which projects about two-thirds of the way into the drum.2
  • the shaftv84 is journaled in a boss carried by the front wall 44.
  • On the projecting forward end of the shaft 64 is mounted a sprocket 65 over which passes a chain 66, the free lower end o f which carries a counterweight 61.
  • the other end of the chain 66 is pivotally connected with the upper end of an arm 68, the hub 69 of which is pivoted on the rod 53.
  • the arm 68 carries a cam roll 18 which is held against the working periphery of a cam 12 fixedly mounted on the cam shaft 59 by the counterweight 61.
  • the bail 28 is a straight member somewhat longer than the lower drum 2
  • the inner end of the shaft 16 is loosely received in the drum 2
  • the rear projecting end of the shaft 16 carries a sprocket 19 over which passes a chain 88, the downwardly extending end of which carries a counterweight 8
  • the other end of the chain 88 is pivotally connected with the upper end of a curved arm 82, the hub 83 of which is pivoted on the rod 53.
  • the arm 82 carries a cam roll 84 which is held against the working periphery of a cam 85 by means of the counterweight 8
  • the paper feeding rolls 29 and 38 are jour naled in the upper offset ends of uprights 81 and 88 extending upwardly from the right hand ends of the frame walls 44 and 45, respectively.
  • the rear end of the shaft 89 of the upper feed roll 29 projects beyond the upright 88 and carries a spur gear 98 which meshes with and is driven by a spur gear 9
  • a sprocket wheel 93 On the forward end of the shaft 92 is loosely mounted a sprocket wheel 93 over which passes a chain 95, the free downwardly extending end of which carries a counterweight 96, the other end of the chain 95 is pivotally connected with the upp er end of an arm 91, the hub 98 of which is pivoted on the rod 53.
  • the arm 91 carries a cam roll 99 held against the working periphery of a cam
  • 02 On the outer forward end of the feed roll shaft 92 is loosely mounted a ratchet wheel
  • the paper cutting devices are arranged transversely of the length of paper and comprise lthe rotary cutter 3
  • is arranged to oscillate in a hollow cylindrical stationary cutter member
  • 88 serves as the stationary cutter edge with which the movable.
  • 88 is secured in a housing
  • 2 has a wide opening in its front side and on its other side a pair of downwardly extending lips
  • are provided with the trunnions
  • 1 and at its upper end to the upper extremity of a finger I9 rising from the upright 88 turns the rotary cutter 3
  • the rotary cutter is turnedin counterclockwise direction to bring its cutting edge
  • the hopper 35 is a vertically and transversely arranged rectangular box-like structure somewhat wider than the length of the cores 22 it contains.
  • the hopper 35 is xed in a U-shaped frame
  • 25 are each provided with an outwardly extending stud
  • 32 is oscillated in one direction by means of an arm 34 the hub
  • 34 is connected with the forward ends of two links
  • 40 is interposed between the rear ends of the links
  • 38 carry betwen them a cam roll
  • the hopper is positively lowered into the position shown in Fig.
  • 46 of the hopper 35 is contracted so as to permit of the passage therethrough of the cores in single file only, as shown in Figs. 3, 4 and 6.
  • 46 discharges into a horizontally 'disposed guide-way
  • 'I'he shoe 33 is a concave member substantially as long as the lower drum 2
  • 53 are loosely articulated by a pin and slot connection
  • 53 are connected with the hopper neck
  • 65 also serves as the hub of a forwardly extending arm
  • 68 serves to hold the blade 31 and box 38 in inactive positions.
  • 63 and at the other end with the frame extension 64 acts to move the blade 31 and the box 38 into active positions, as shown in Figs. to 12. It will thus be understood that the blade 31v and the glue displacer 38 move simultaneously into and out of active and inactive positions.
  • the glue reservoir 21 is a trough-like structure having a bottom
  • the arrangement is such that when the link
  • T'he improved machine described above is a preferred form. although other forms have proved satisfactory for carrying out the lnovel method.
  • the important feature seems to be the exertion of sufficient pressure on one end of a glue smeared paper wrapper and the graphite core to cause the glue to enter not only the pores of the paper but also the pores of the graphite core so 4that the glue between these surfaces is in its maximum sticky state. causing the paper to adhere to the core rather than to the sides o'f the pocket as the paper is coiled by the pocket around the core, and then continuing the pressure on the successive coils of paperto squeeze out the surplus glue from between paper coils, so that there is produced a sheath composed of a substantially solid mass o f paper.
  • the resulting sheath closely resembles the usual wood sheath, but is cheaper to produce and of more uniform quality.
  • the glue employed may be any preferred. kind. Satisfactory results are obtained by using sodium silicate of an alkali-silicate ratio of about 1 to 3.22 diluted with water to a specific gravity 011.3.
  • a textile fabric web substantially as wide as the core is long means for forming a transverse open-mouthed core-receiving pocket in the web, means for depositing a core in the pocket, means for feeding a wrapper to the pocket to bring the forward edge of the wrapper under the core therein, means for partially closing the mouth of the pocket to prevent the exit of the core therefrom but permitting the continued feeding of the wrapper thereinto, means for immersing the pocket, and the core with the part of the wrapper on the core in glue, means for moving the belt in the direction of the feed of the wrapper to bring the inner sides of the pocket tightly upon the core with the wrapper thereagainst, the travel of the web serving to rotate the core and cause the wrapper to be wound in successive coils about it, and means for' exerting a retarding drag on the web to increase the pressure of the pocket upon the core and coils of paper.
  • the method of winding alternate coils of paper and glue around an elongated core to form a sheath thereon which consists in forming a transverse open-mouthed core-receiving pocket in a traveling web substantially as wide as the core is long, smearing the upper surface of the portion of the web advancing to the pocket with glue, introducing a core and the forward end of a paper wrapper into the pocket with the forward margin ofthe paper between the core and l the inner wall of the pocket, the remainder of the paper wrapper temporarily adhering-to the glue-smeared surface of the web, closing the mouth of the pocket sufciently to prevent the exit of the core from the pocket but permitting the passage of the paper into the pocket, im'- mersing the pocket and its contents in glue, exerting a drag on the part of the web traveling toward the pocket while exerting a pull on the part of the web leaving the pocket so as thereby to cause the inner surface ofthe pocket to embrace tightly first the core and the first coil of paper and glue thereon
  • a machine for wrapping successive, alternate coils of paper and glue around an elongated core to form a sheath therefor comprising, a hopper for containing the cores, a web substantially as wide as the core is long, a first drum to which one end of the web is attached, a second drum spaced apart from the first drum and to which the other end of the web is attached, means for turning the drums in both directions independently of each other so that at times the section of the web extending from one drum to the other is taut, and at other times loose with a full coil of web wrapped around the first drum, ⁇ the loose section of web between the drums forming an open-mouthed core-receiving pocket adjacent the first drum, means for feeding a strip of paper substantially as wide as the web at an angle to the first drum so that the advancing edge of the paper is above the first drum, a tilted clamping shoe pivotally mounted on the hopper, means for lowering the hopper so that the toe end of the shoe presses the forward edge of the wrapper against the

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US369789A 1940-12-12 1940-12-12 Machine and method for making paper-wrapped pencils Expired - Lifetime US2259959A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US369789A US2259959A (en) 1940-12-12 1940-12-12 Machine and method for making paper-wrapped pencils
GB14809/47A GB635498A (en) 1940-12-12 1947-06-04 Improvements in or relating to machine and method for making paper-wrapped pencils
FR953233D FR953233A (fr) 1940-12-12 1947-09-19 Machine et procédé pour fabriquer des crayons en papier enroulé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US369789A US2259959A (en) 1940-12-12 1940-12-12 Machine and method for making paper-wrapped pencils

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US2259959A true US2259959A (en) 1941-10-21

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US (1) US2259959A (fr)
FR (1) FR953233A (fr)
GB (1) GB635498A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2574154A (en) * 1948-10-25 1951-11-06 Joseph Dixon Crucible Co Machine for winding a sheath around a core
US2898824A (en) * 1955-01-20 1959-08-11 Joseph Dixon Crucible Co Method of and apparatus for winding a sheath around a core
US3256503A (en) * 1961-04-25 1966-06-14 Flexible Tubing Corp Apparatus for the manufacture of flexible tubes of resin-impregnated porous material
US6139671A (en) * 1998-09-18 2000-10-31 Shin-Dih; Su Method for manufacturing pencils having a paper-made cylinder
CN102303469A (zh) * 2011-05-26 2012-01-04 万永全 铅笔的制作方法
CN103862923A (zh) * 2012-12-17 2014-06-18 张鹤忱 纸制铅笔加工装置及其粘铅芯机
CN105856904A (zh) * 2016-04-20 2016-08-17 王保春 全自动纸杆铅笔卷杆单元、包含其的生产设备及生产方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991011334A1 (fr) * 1990-02-04 1991-08-08 J.S. Staedtler Gmbh & Co. Crayon pour ecrire ou peindre avec une tige consistant en une gaine en matiere sous forme de film ou de feuille, et procede pour sa fabrication
US9090784B2 (en) * 2010-08-05 2015-07-28 Mitsubishi Pencil Company, Limited Solid drawing material and solid drawing tool
CN112355752B (zh) * 2020-10-16 2021-11-09 靖州县金心笔业有限责任公司 自动切断式铅笔生产设备

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2574154A (en) * 1948-10-25 1951-11-06 Joseph Dixon Crucible Co Machine for winding a sheath around a core
US2898824A (en) * 1955-01-20 1959-08-11 Joseph Dixon Crucible Co Method of and apparatus for winding a sheath around a core
US3256503A (en) * 1961-04-25 1966-06-14 Flexible Tubing Corp Apparatus for the manufacture of flexible tubes of resin-impregnated porous material
US6139671A (en) * 1998-09-18 2000-10-31 Shin-Dih; Su Method for manufacturing pencils having a paper-made cylinder
CN102303469A (zh) * 2011-05-26 2012-01-04 万永全 铅笔的制作方法
CN103862923A (zh) * 2012-12-17 2014-06-18 张鹤忱 纸制铅笔加工装置及其粘铅芯机
CN103862923B (zh) * 2012-12-17 2015-12-16 张鹤忱 纸制铅笔加工装置及其粘铅芯机
CN105856904A (zh) * 2016-04-20 2016-08-17 王保春 全自动纸杆铅笔卷杆单元、包含其的生产设备及生产方法
CN105856904B (zh) * 2016-04-20 2018-01-12 王保春 全自动纸杆铅笔卷杆单元、包含其的生产设备及生产方法

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GB635498A (en) 1950-04-12
FR953233A (fr) 1949-12-02

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