US2799551A - Device for recording the operation of the keys of a typewriter - Google Patents

Device for recording the operation of the keys of a typewriter Download PDF

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Publication number
US2799551A
US2799551A US410601A US41060154A US2799551A US 2799551 A US2799551 A US 2799551A US 410601 A US410601 A US 410601A US 41060154 A US41060154 A US 41060154A US 2799551 A US2799551 A US 2799551A
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US
United States
Prior art keywords
strip
keys
line
carriage
tracer
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
US410601A
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English (en)
Inventor
Nitschke Bruno
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.)
Adlerwerke AG
Original Assignee
Adlerwerke AG
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 Adlerwerke AG filed Critical Adlerwerke AG
Application granted granted Critical
Publication of US2799551A publication Critical patent/US2799551A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns

Definitions

  • This invention relates to a device for recording the operation of the keys of a typewriter. It is therefore an object of theinvention to provide a machine with a paper strip on which the speed and degree of typing is recorded after which the strip is compared with a scale to permit the determination of the speed and uniformity of typing of a particular typist.
  • a further object of the invention is to provide a device to be attached on a typewriter to record the type impression together with a line record indicating the depression and release of the respective keys one after the other.
  • a still further object of the invention resides in the apparatus to determine at all times the typing speed as well as the uniformity or non-uniformity of typing including the time each key is held before release after the type impression is made. Thus the time of depression and release of each key may be accurately recorded and determined so that it is possible to record and measure the performance of any typist for any desired time interval.
  • Another object of the invention resides in the pro vision of a device to be operated with and adjacent to a carbon ribbon and its guide fork so as to record the typing speed and the specific performance as compared with adjacent type impressions.
  • Figure 1 is a perspective view of a portion of a typewriter with the invention applied thereon
  • Fig. 2 is a diagrammatic plan view of a scale to interpret the data taken from the typewriter
  • Fig. 3 is a perspective view of a part of the machine as seen from the rear, and
  • Figs. 4 to 6 are each diagrammatic plan views of the strip with various data provided thereon.
  • a removable cover 11 On the upper part 10 of the typewriter there is provided on a removable cover 11, a paper roll 12, guide rollers 20 and 21, and guide forks 9 for directing a strip 1 over the machine.
  • the type members 2 operate in the usual manner to strike on and over a color ribbon 4 against a platen 5 and the reprint 3 struck by the type member is recorded on the paper strip.
  • These reprints or impressions on the strip 1 as to the typed characters thereon have a certain spacing between the individual letters and numerals depending upon the typing speed.
  • the type impressions are produced on the sheet of transparent paper 6 by means of an inverted carbon paper sheet 7, together with any desired carbon copies depending upon the number of carbon paper sheets used for this purpose.
  • the platen 5 operates rotatably and axially in the manner usual in standard typewriters. From the guide forks 9 the strip 1 passes along rollers 22 and 23 onto a drive roller 24. The strip 1 is pressed against the drive roller by a roller 25 and the roller 24 is suitably driven by a motor 13 through gears 26.
  • the strip 1 passes a stroke time tracer 29 at a uniform speed, Fig. 3,
  • the tracer 29 may consist of a writing point as a lead rod, which will positively place a discernible line on the strip 1 or it may consist of a metal pin which does not carry any color holder but which will act on a specially prepared surface on the strip 1 so that when the strip passes the pin a discernible line will be produced.
  • the color band 4 can also be used to print a line on the. strip 1 by the tracer 29 in which case a more saturated band 4'will be used. In that case the color band 4 will pass between the tracer 29 and the strip 1.
  • the tracer 29 records directly on the strip 1, it is brought somewhat higher, so that it will be above the color band 4.
  • the tracer 29 is not pointed but slightly rounded so that it will not damage the color band 4.
  • the descending line 34 is not as steep on the strip 1 as shown in Fig. 4, but will be represented by a less steep line as shown in Fig. 5. Also a so-called irregular or hesitating release of the key after printing will show on the descending line as a jog 35 therein, Fig. 5.
  • the lines in Fig. 6 show that when striking three letters 3, one after the other, the time each key is held before release after printing gradually increases as is evident by comparing the length of the lines 37, 39 and 41. Also the descending lines 38, 40 and 42 show that due to the angles of these lines, the key was released by the fingers only with a moderate speed.
  • the strip 1 forms a permanent record of the performance of the typist not only as to speed but as to the character of each individual typing.
  • a typewriting machine in combination with a plurality of keys, type bars actuated by said keys, a carbon ribbon, a ribbon vibrator to raise and lower said carbon ribbon at the printing point on actuation of any one of said keys, a carriage, means to feed said carriage step by step in accordance with the actuation of the keys, a recording strip means to mount said strip parallel to the longitudinal extension of said carriage, means to feed said strip at aconstant rate of speed independently of the feeding motion of said carriage, and a tracer means mounted on said ribbon vibrator for tracing a line'on said strip.
  • a typewriting machine in combination with a plurality of keys, type bars actuated by said keys, a carbon ribbon, a ribbon vibrator to raiseand lower said carbon ribbon at the printing point on actuation of any one of said keys, a carriage, a platen mounted on said carriage, means to feed said carriage step by step in accordance with the actuation of the keys, a recording strip means to mount said strip parallel to the longitudinal extension of said carriage, means to feed said strip at a constant rate of speed independently of the feeding motion of said carriage, a tracer means mounted on said ribbon vibrator for tracing a line on said strip, and means to guide said strip at the printing point between said carbon ribbon and said platen.
  • a typewriting machine in combination with a plurality of keys, type bars actuated by said keys, a carbon ribbon, a ribbon vibrator to raise and lower said carbon ribbon at the printing point on actuation of any one of said keys, a carriage, a platen mounted on said carriage, means to feed said carriage step by step in accordance with the actuation of the keys, a recording strip means to mount said strip parallel to the longitudinal extension of said carriage, means to feed said strip at a constant rate of speed independently of the feeding motion of said carriage, a tracer means removably mounted on said ribbon vibrator for tracing'a line on said strip, and
  • tracer means mounted on said ribbon vibrator for tracing a line on said strip, said tracer means comprising a post having a tracing rod thereon.

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  • Impression-Transfer Materials And Handling Thereof (AREA)
US410601A 1954-03-03 1954-02-16 Device for recording the operation of the keys of a typewriter Expired - Lifetime US2799551A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH297864T 1954-03-03
DEA17589A DE1038072B (de) 1954-03-03 1954-03-03 Vorrichtung zur Anwendung des Verfahrens zum Messen der Geschwindigkeit der Betaetigung von Schreibmaschinen u. dgl.

Publications (1)

Publication Number Publication Date
US2799551A true US2799551A (en) 1957-07-16

Family

ID=25733902

Family Applications (1)

Application Number Title Priority Date Filing Date
US410601A Expired - Lifetime US2799551A (en) 1954-03-03 1954-02-16 Device for recording the operation of the keys of a typewriter

Country Status (3)

Country Link
US (1) US2799551A (de)
CH (1) CH320660A (de)
DE (1) DE1038072B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3285384A (en) * 1963-12-18 1966-11-15 Battelle Development Corp System for detecting irregularities in typing technique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1120912A (en) * 1966-08-24 1968-07-24 Battelle Development Corp System for detecting irregularities in typing technique

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431043A (en) * 1944-01-20 1947-11-18 Ibm Typewriter rhythm recorder

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE659966C (de) * 1934-09-23 1938-05-13 Walter Stertz Linier- und Unterstreichvorrichtung fuer Schreibmaschinen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431043A (en) * 1944-01-20 1947-11-18 Ibm Typewriter rhythm recorder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3285384A (en) * 1963-12-18 1966-11-15 Battelle Development Corp System for detecting irregularities in typing technique

Also Published As

Publication number Publication date
CH320660A (de) 1957-03-31
DE1038072B (de) 1958-09-04

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