US3711861A - Tube writing pen, particularly for automatic drawing machines - Google Patents

Tube writing pen, particularly for automatic drawing machines Download PDF

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Publication number
US3711861A
US3711861A US00222873A US3711861DA US3711861A US 3711861 A US3711861 A US 3711861A US 00222873 A US00222873 A US 00222873A US 3711861D A US3711861D A US 3711861DA US 3711861 A US3711861 A US 3711861A
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US
United States
Prior art keywords
dropweight
ink
pen
speed
automatic drawing
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
US00222873A
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English (en)
Inventor
E Lorenz
H Soring
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.)
Koh-I-Noor Rapidograph Inc
KOH I NOOR RAPIDOGRAPH
Original Assignee
KOH I NOOR RAPIDOGRAPH
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 KOH I NOOR RAPIDOGRAPH filed Critical KOH I NOOR RAPIDOGRAPH
Application granted granted Critical
Publication of US3711861A publication Critical patent/US3711861A/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
    • B43K8/00—Pens with writing-points other than nibs or balls
    • B43K8/16—Pens with writing-points other than nibs or balls with tubular writing-points comprising a movable cleaning element
    • B43K8/18—Arrangements for feeding the ink to the writing-points

Definitions

  • ABSTRACT A stylographic or tube writing pen including an inter- Forei n A cation Prior Data nal bore and an axially movable drop weight therein g pp y mounting a clearing wire, the external surface of the drop weight having a helical recess extending at least Feb. 4, I971 Germany........ ............P 2! 05 131.0
  • the pen is [58] Field of Search especially useful for automatic drawing machines l wherein writing or tracing speed IS llmlted by the rate of available ink supply flow to the pen point.
  • the rate of flow of ink from the writing tube is limited substantially by a capillary annular chamber between the inner wall of the writing tube and the clearing wire. Consequently the tracing speed of conventional tube writing pens is subject to a maximum speed above which the supply of ink is insufficient to provide a continuous trace of a desired width. This is particularly a drawback in automatic drawing equipment which, as such, admits of high drawing speeds but which cannot work at full capacity because of the limitation imposed on the rate ofink supply.
  • a stylographic or tube writing pen wherein the pen comprises a cylindrical member which, at one end, forms a writing tube mount, and which is formed with an internal bore for the reception of an axially movable dropweight carrying a clearing wire, and wherein the surface of the dropweight is formed with a helical recess or groove, the dropweight being rotatable about its longitudinal axis.
  • Rotation of the dropweight causes the helical groove to convey ink to the writing tube and to generate in the front end part of the internal bore containing the dropweight a surplus of ink or a gauge pressure, so that the rate of discharge of the ink from the writing tube is increased.
  • rotation of the helical groove applies forces to the ink which improve its viscosity, this likewise contributing towards permitting a higher drawing speed.
  • the helical groove extends axially along the entire length of the dropweight.
  • Rotation about its longitudinal axis can be imparted to the dropweight in various ways.
  • the end of the dropweight remote from the clearing wire may be provided with an extension for coupling the same to a drive means.
  • a flexible shaft may be attached to this extension and driven by a motor at a controllable speed.
  • FIGURE is an axial sectional view through a pen schematically showing the invention.
  • a pen generally designated including a body portion 12 in the nature of a shaft-like holder.
  • a cylindrical member 14 is screwed into the holder or body portion 12 and has an internal bore 16 which communicates with an ink reservoir 18 with an ink supply therein generally indicated at 20.
  • a writing tube or pen point 22 is inserted into the bottom end of the cylindrical member 14 in a usual manner.
  • the member 14 is formed with a helical equalization chamber 24 in a known manner.
  • a dropweight 26 is slidably mounted and contained within internal bore 16 and attached to the bottom end of the dropweight is a clearing wire 28 which in a usual manner is extendable into the bore in writing tube or point 22. In the illustrated position, with the dropweight in its lowermost position, the clearing wire 28 projects from the bottom end of the writing tube. When the pen writes, the clearing wire 28 is pushed back in a conventional manner into the writing tube or point 22 and thus lifts the dropweight 26. This motion of the wire or the motion produced by corresponding shaking movements enables the writing tube to be kept clean and the flow of ink to be started.
  • Dropweight 26 has a helical groove or the like 30 formed on its longitudinal external surface and which in the illustrated embodiment has the form of a screw thread extending axially up the entire length of the dropweight.
  • ink 20 enters the chamber 32 above the writing tube after flowing from reservoir 18 and through internal bore 16 and thence through channels or the like 34 formed in the bearing shoulder 36 as indicated by arrows 38.
  • the clearing wire 28 is pushed upwards and lifts the dropweight, permitting ink to flow in and the entire end base of the writing tube or pen point 22 rests on the paper.
  • the illustrated pen functions in a conventional manner. However, when drawing speed is higher, the
  • the present invention incorporates mechanism to overcome this deficiency.
  • dropweight 26 is provided at its upper end with a stud 40 or the like adapted for attachment of the dropweight to drive means which are schematically shown.
  • the drive means can, for example, include an extension 42 of any desired construction such as a flexible cable, shaft, etc. attached to stud 40 for coupling the same to a drive means including a speed reducer 44 and a controllable speed drive motor 46 operatively driving stud 40 through the speed reducer and connecting means.
  • a speed reducer 44 and a controllable speed drive motor 46 operatively driving stud 40 through the speed reducer and connecting means.
  • the helical groove 30 will convey ink from the ink reservoir 18 downward to the writing tube or pen point 22 and generate a gauge pressure below the bottom end of the dropweight.
  • the rate of ink discharged from the writing tube is thus increased permitting a correspondingly higher drawing speed.
  • the speed of rotation of the dropweight can be adjusted according to the desired drawing speed in such a manner that the ink will be forcedoutofthe end of the writing tube at the exact rate needed .to meet the demands of drawing the desired width of trace at the desired speed.
  • controllable drive rotating the dropweight can be varied or incorporate specifically different drive means.
  • a stylographic pen comprising:
  • said dropweight being rotatable about its longitudinal axis and adapted upon rotation to force the ink through said writing tube.
  • a stylographic pen as claimed in claim 2 wherein the helical recess extends over the entire axial length of said dropweight, said ink supply comprising an ink reservoir and at least a portion of the threaded dropweight operatively extending into said reservoir.
  • a stylographic pen as claimed in claim 3 including an extension on the end of said dropweight remote from said clearing wire adapted for coupling engagement with drive means for rotating said dropweight.
  • a stylographic pen as claimed in claim 4 wherein the drive means for rotating said dropweight includes a controllable speed drive motor and a speed reduction mechanism operatively connected to said drive motor.
  • a stylographic pen as claimed in claim 1 in combination with an automatic drawing machine wherein means are provided for rotatably driving said dropweight at a speed correlated with speed of operation of said drawing machine.

Landscapes

  • Pens And Brushes (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
US00222873A 1971-02-04 1972-02-02 Tube writing pen, particularly for automatic drawing machines Expired - Lifetime US3711861A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2105131A DE2105131C3 (de) 1971-02-04 1971-02-04 Röhrchenschreiber, insbesondere für automatische Zeichenvorrichtungen

Publications (1)

Publication Number Publication Date
US3711861A true US3711861A (en) 1973-01-16

Family

ID=5797757

Family Applications (1)

Application Number Title Priority Date Filing Date
US00222873A Expired - Lifetime US3711861A (en) 1971-02-04 1972-02-02 Tube writing pen, particularly for automatic drawing machines

Country Status (5)

Country Link
US (1) US3711861A (show.php)
JP (1) JPS5520879B1 (show.php)
DE (1) DE2105131C3 (show.php)
FR (1) FR2123985A5 (show.php)
GB (1) GB1307789A (show.php)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2758186C2 (de) * 1977-12-27 1983-01-05 Rotring-Werke Riepe Kg, 2000 Hamburg Röhrchenschreiber für automatische Zeichenvorrichtungen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169821A (en) * 1963-11-20 1965-02-16 Hewlett Packard Co Fluid pressure controller
US3594092A (en) * 1969-03-06 1971-07-20 Carlton M Dicarlo Drafting pen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169821A (en) * 1963-11-20 1965-02-16 Hewlett Packard Co Fluid pressure controller
US3594092A (en) * 1969-03-06 1971-07-20 Carlton M Dicarlo Drafting pen

Also Published As

Publication number Publication date
DE2105131C3 (de) 1979-03-15
DE2105131A1 (de) 1972-08-10
JPS5520879B1 (show.php) 1980-06-05
GB1307789A (en) 1973-02-21
DE2105131B2 (de) 1976-05-20
FR2123985A5 (show.php) 1972-09-15

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