US3874286A - Printing apparatus - Google Patents

Printing apparatus Download PDF

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Publication number
US3874286A
US3874286A US392180A US39218073A US3874286A US 3874286 A US3874286 A US 3874286A US 392180 A US392180 A US 392180A US 39218073 A US39218073 A US 39218073A US 3874286 A US3874286 A US 3874286A
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United States
Prior art keywords
connection disc
connection
engagement
rotation
main shaft
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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
US392180A
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English (en)
Inventor
Chuji Ishikawa
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.)
Ricoh Co Ltd
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Ricoh Co Ltd
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Publication date
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Publication of US3874286A publication Critical patent/US3874286A/en
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06C—DIGITAL COMPUTERS IN WHICH ALL THE COMPUTATION IS EFFECTED MECHANICALLY
    • G06C11/00—Output mechanisms
    • G06C11/04—Output mechanisms with printing mechanisms, e.g. for character-at-a-time or line-at-a-time printing

Definitions

  • ABSTRACT A printing apparatus for cash registers and the like wherein the set of type wheels are rotated through co- 1 Apr. 1, 1975 operating serrations by respective connection discs which are loosely mounted on an operating shaft that is reciprocally rotated by a suitable driving system.
  • An arm member is secured to the operating shaft adjacent each disc for reciprocal rotation therewith and has a lock member formed on its free end which cooperates with a catch means formed on a lever member which is pivotally supported on the adjacent connection disc.
  • a spring is connected between each lever member and the connection disc for urging the catch means into cooperative engagement with the lock member so as to rotate the connection discs with the operating shaft through the adjacent arm members.
  • a selectively operated pawl is arranged adjacent each connection disc to stop the rotation of the connection disc at a predetermined position corresponding to the proper positioning of a digit on the cooperating type wheel, at which time the spring permits release of the cooperating engagement between the catch means and the lock member permitting the continued rotation of the operating shaft.
  • the shaft may rotate until each of the connection discs has been stopped at a proper position and then the appropriate digits on the type wheels may be printed. Rotation of the shaft is then reversed and the connection wheels returned to their original positions by release of the pawls and reengagement of the catch means and lock members.
  • Alternate forms of the driving system for rotation of the operating shaft are disclosed and a second set of type wheels may be included for cooperation with the connection discs to provide a second corresponding printout.
  • This invention relates to printing apparatus. and more particularly to a printing apparatus of the type used with cash registers and the like.
  • a main shaft under the influence of a spring is rotated against the biasing force of the spring to thereby rotate type wheels in meshing engagement with connection discs mounted on the main shaft.
  • Printing is carried out while the connection discs and the type wheels remain stationary in predetermined positions and the main shaft continues to rotate.
  • the main shaft. connection discs and type wheels are then rotated in the reverse direction, after printing. by the biasing force of the spring andreturned to their initial position.
  • This type of apparatus has disadvantages in that. for example. a force of comparatively large magnitude is required to rotate the connection discs against the biasing force of the spring; the load is not uniform because it relies on the degree of expansion of the spring; and a considerable shock is produced when the moving parts return to their original positions.
  • connection discs are mounted on the main shaft. arranged in side-by side relationship. and connected to one another through plate springs. Owing to inertia or some force unexpectedly exerted on the apparatus at the time the main shaft starts rotating. some of the connection discs may be kept from rotating in synchronism with the main shaft, with the result that pawls for stopping the respective connection discs will not be brought into engagement with teeth in correct positions.
  • the object of this invention is to obviate the aforementioned disadvantages of the prior art.
  • the present invention provides a printing apparatus for cash registers and the like having wheels and a rotatable main shaft and including: means for rotating the main shaft in opposite directions comprising a first gear secured to the main shaft. :1 second gear in meshing engagement with the first gear. and a member for moving the second gear in swinging motion in opposite directions; operation units each comprising a pivotal arm secured to the main shaft and formed at its forward end with a lock. a connection disc loosely mounted on the main shaft and maintained in meshing engagement with the type wheel. and a lever pivotally supported by the connection disc and formed therein with a catch adapted to engage the lock. the number of such units being equal to the number of digit positions of a numeral to be printed; and means for stopping each connection disc in a position corresponding to the digit set for which the connection disc functions.
  • FIG. I is a view of the printing apparatus comprising one embodiment of the present invention, shown in its standby position;
  • FIG. 2 is a view of the printing apparatus of FIG. 1 shown in its operative or printing position;
  • FIG. 3 shows a modification ofthe printing apparatus according to the invention.
  • FIG. 4 shows a modified cam and follower arrangement
  • a cam l is adapted to rotate. for example. in response to a function key being dcpressed following the setting of the cash register at a certain number.
  • Rotation of the cam I causes a segmental gear 2. through a roller 3 in engagement with the cam I. to move in swinging motion about a shaft 4 in opposite directions.
  • a return spring 5 acting on the segmental gear 2 maintains the roller 3 and cam I in engagement with each other.
  • the segmental gear 2 has a serration 2A which is in meshing engagement with gear 7 that is secured to a main shaft 6 to which a pivotal arm 8 (for one unit) is secured and on which a connection disc 9 (for one unit) is loosely mounted.
  • connection disc 9 is formed on its outer periphery with an involute serration portion 9A and a ratchet serration portion 98 of the same pitch.
  • a coupling lever 10 which is pivotally connected at II to the connection disc 9 is normally urged to move clockwise in FIG. I and FIG. 2 about its pivot I I by the biasing force of a tension spring 12 connected at one end to the connection disc 9 and at the other end to the coupling lever III.
  • the pivotal arm 8 has planted at its forward end a pin I3 adapted to be engaged in a recess 10A formed in the coupling lever II). The action ofthe spring I2 ensures that the pin 13 is engaged by the edges of the recess 10A.
  • a type wheel 14 which is formed with a serration 14A in meshing engagement with the involute serration portion 9A ofthe connection disk 9 has inscribed on its outer periphery characters and digits in any necessary number (fifteen in this embodiment) which is equal to the number of teeth of the serration MA.
  • a paper web 24 and a ribbon 25 move between the type wheel 14 and a platen 15 so that printing is carried out by the type characters on the outer periphery of the type wheel 14.
  • the pivotal arm 8, connection plate 9., coupling lever I0 and type wheel I4 are provided in any number which is equal to the number of digit positions in a numeral or the number of symbols to be printed. and arranged in side by side relation on main shaft 6.
  • each connection disc 9 Disposed adjacent the ratchet serration portion 9B of each connection disc 9 is a pawl 16 which is urged by the biasing force of a spring 17 into engagement with the ratchet serration 9B.
  • the pawl 16 is controlled by a solenoid I9 through a trigger lever I8 adapted to engage in a recess 16A formed in the pawl 16.
  • the various solenoids 19 are disposed in three different positions in which they are displaced from one another for compactness.
  • Each trigger lever 18 is normally urged by the biasing force of a spring 2] into engagement in the recess 16A in the respective pawl I6.
  • a stopper 22 is provided for aligning connection discs 9 and consequently type wheels 14.
  • a release member 23 adapted to rotate in synchronism with the cam l, releases the pawl 16 from engagement with the ratchet serration portion of the connection disc 9.
  • Each pivotal arm 8 secured to the main shaft 6 pivots counter clockwise and causes each connection disc 9 to rotate through the coupling lever 10 by virtue of the engagement of the pin l3 in the recess 10A. This causes each type wheel 14. which is in engagement with the serration 9A of the connection disc 9 through the serration 14A, to rotate clockwise.
  • each connection disc 9 Attached to the ratchet serration portion of each connection disc 9 is known tooth number detector (not shown) which produces a signal to the respective solenoid l9 during the rotation of the connection disc 9 when the number of teeth detected by the detector co incides with the digit set by depressing a number setting key.
  • the solenoid 19 Upon receipt of the signal, the solenoid 19 is energized and releases the trigger lever 18 from engagement in the recess 16A formed in the pawl 16. This results in the pawl 16 being brought into meshing engagement with the ratchet serration portion 98 of the connection disc 9 by the biasing force of the spring 17 to thereby interrupt the rotation of connection disc 9.
  • the pin 13 engages the recess MA.
  • connection disc 9 is rotated by the pivotal arm 8 through the coupling lever 10.
  • the rotation of connection disc 9 is interrupted by the pawl l6 then the pin 13 is released from engagement in the recess 10A by overcoming the biasing force of spring l2 through rotation with main shaft 6 and pivotal arm 8.
  • the main shaft 6 continues to rotate and eventually stops after continuing its movement upon reaching a predetermined angular position following the interruption of rotation of connection disc 9.
  • each connection disc 9 and consequently each type wheel [4 stops in a position consistent with the digit set by depressing a number setting key.
  • the stopper 22 Upon completion of the rotation of main shaft 6 the stopper 22 is brought into engagement with the involute serrations 9A so as to align all connection discs 9 and consequently the type wheels 14 in position to thereby permit printing to be carried out by the platen 15.
  • the printing apparatus is shown in the operative or printing position in FIG. 2.
  • the stopper 22 is restored to its original position. and the rotating release member 23 moves the pawl l6 downwardly against the biasing force of spring 17.
  • the pawl 16 is released from engagement with the ratchet serration portion 9B and locked by the trigger 18 as the latter is brought into engagement in the recess 16A formed in the pawl [6.
  • the scg mental gear 2 swings counterclockwise under the influence of the return spring 5, and the main shaft 6 and pivotal arm 8 move clockwise.
  • the pin 13 on the pivotal arm 8 again engages in the recess ltlA formed in the coupling lever 10, so that the connection disc 9 is restored to its original position shown in FIGv I through the coupling lever 10.
  • the cam I may be in the form of a groove cam l formed therein with a groove for receiving therein the roller 3' on the segmental gear 2, so that the cam 1' can control the back and forth swinging motion of the segmental gear in its entire range.
  • This arrangement would permit the return spring 5 to be eliminated because the segmental gear 2 can be controlled positively by the cam i. This arrangement is shown in FIG. 4.
  • FIG. 3 shows a modification of the printing apparatus according to the invention.
  • another type wheel 14' formed with a serration l4'A is employed in addition to the type wheel 14 formed with the serration 14A.
  • the type wheel 14' has a platen l5 cooperating therewith, with a paper web 24' and a ribbon 25' being interposed between them This arrangement permits two receipts, one for the customer and the other for filing purposes. to be prepared.
  • each connection disc 9 is made ready to carry out printing with the type wheel l4 after finishing printing with the type wheel l4. so that the same printing operation can be performed twice.
  • connection disc 9 permits each connection disc 9 to be rotated positively when the main shaft 6 rotates by virtue of the engagement ofthe pin 13 in the recess 10A.
  • This arrangement permits the connection disc 9 to be rotated positively by the main shaft 6, even if the load is great in magnitude as in the case with the embodiment shown in FIG. 3. Since no spring is used to return each connection disc to its original position. the need to rotate the main shaft against the biasing force of the spring is elimininated and variations in load occuring during the rotation of the main shaft are very small.
  • a printing apparatus for cash registers and the like comprising:
  • a rotatable type wheel having a first serrated portion thereon;
  • connection disc having a second serrated portion thereon cooperating with said first serrated portion to rotate said type wheel in response to rotation of said connection disc;
  • gear means secured to said main shaft for rotation therewith;
  • catch means formed thereon for cooperatively engaging said lock member
  • connection disc means for stopping said connection disc during rotation at a predetermined position corresponding to a desired position for said type wheel.
  • a biasing spring for urging said pawl means toward engagement with said third serrated portion; 2. trigger means for engaging and holding said pawl means against the urging of said biasing spring; and 3. means for releasing the engagement between said trigger means and said pawl means.
  • Apparatus as in claim 1 further comprising a second rotatable type wheel having a third serrated portion thereon for cooperating with a fourth serrated portion on said connection disc.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Transmission Devices (AREA)
  • Cash Registers Or Receiving Machines (AREA)
US392180A 1972-08-30 1973-08-28 Printing apparatus Expired - Lifetime US3874286A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47086252A JPS4943715A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-08-30 1972-08-30

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JP (1) JPS4943715A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4015521A (en) * 1975-04-14 1977-04-05 Bell & Howell Company Character printing apparatus
US4033256A (en) * 1974-05-09 1977-07-05 Kabushiki Kaisha Suwa Seikosha Printer
US4161912A (en) * 1976-06-04 1979-07-24 Shinshu Seiki Kabushiki Kaisha Miniature printer
US4164181A (en) * 1974-05-09 1979-08-14 Kabushiki Kaisha Suwa Seikosha Printer
US5113759A (en) * 1989-05-15 1992-05-19 Citizen Watch Co., Ltd. Latch mechanism for small-size printer
US20040057493A1 (en) * 2002-07-15 2004-03-25 Chuji Ishikawa Temperature detecting unit and fixing apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307676A (en) * 1965-12-30 1967-03-07 Ibm Printing apparatus with type wheel disconnected from selection means during return to home position
US3664259A (en) * 1970-07-06 1972-05-23 Addmaster Corp Drum series printer with stop pawl engaged by a snap-over spring
US3690249A (en) * 1970-04-24 1972-09-12 Citizen Watch Co Ltd Type wheel setting and re-setting means in selective bed and platen printing machines
US3690250A (en) * 1970-07-16 1972-09-12 Ncr Co Compact label printer
US3732812A (en) * 1971-03-04 1973-05-15 Ncr Differentially positionable type wheels in remotely controlled print modules
US3738264A (en) * 1969-06-13 1973-06-12 Olympia Werke Ag Type carrier setting device
US3756147A (en) * 1970-07-18 1973-09-04 Gross Cash Registers Ltd Coil spring biased printing wheels

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307676A (en) * 1965-12-30 1967-03-07 Ibm Printing apparatus with type wheel disconnected from selection means during return to home position
US3738264A (en) * 1969-06-13 1973-06-12 Olympia Werke Ag Type carrier setting device
US3690249A (en) * 1970-04-24 1972-09-12 Citizen Watch Co Ltd Type wheel setting and re-setting means in selective bed and platen printing machines
US3664259A (en) * 1970-07-06 1972-05-23 Addmaster Corp Drum series printer with stop pawl engaged by a snap-over spring
US3690250A (en) * 1970-07-16 1972-09-12 Ncr Co Compact label printer
US3756147A (en) * 1970-07-18 1973-09-04 Gross Cash Registers Ltd Coil spring biased printing wheels
US3732812A (en) * 1971-03-04 1973-05-15 Ncr Differentially positionable type wheels in remotely controlled print modules

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033256A (en) * 1974-05-09 1977-07-05 Kabushiki Kaisha Suwa Seikosha Printer
US4164181A (en) * 1974-05-09 1979-08-14 Kabushiki Kaisha Suwa Seikosha Printer
US4015521A (en) * 1975-04-14 1977-04-05 Bell & Howell Company Character printing apparatus
US4161912A (en) * 1976-06-04 1979-07-24 Shinshu Seiki Kabushiki Kaisha Miniature printer
US5113759A (en) * 1989-05-15 1992-05-19 Citizen Watch Co., Ltd. Latch mechanism for small-size printer
US20040057493A1 (en) * 2002-07-15 2004-03-25 Chuji Ishikawa Temperature detecting unit and fixing apparatus
US7040806B2 (en) 2002-07-15 2006-05-09 Ricoh Company, Ltd. Temperature detecting unit and fixing apparatus

Also Published As

Publication number Publication date
DE2343563A1 (de) 1974-03-21
JPS4943715A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-04-24
DE2343563B2 (de) 1977-01-27

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