US3923140A - Typewriter carriage decelerator - Google Patents

Typewriter carriage decelerator Download PDF

Info

Publication number
US3923140A
US3923140A US468076A US46807674A US3923140A US 3923140 A US3923140 A US 3923140A US 468076 A US468076 A US 468076A US 46807674 A US46807674 A US 46807674A US 3923140 A US3923140 A US 3923140A
Authority
US
United States
Prior art keywords
overcenter
carriage
mechanism according
lever
members
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
US468076A
Other languages
English (en)
Inventor
Kyuhachiro Iwasaki
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
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Application granted granted Critical
Publication of US3923140A publication Critical patent/US3923140A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/02—Character- or line-spacing mechanisms with retarding devices, e.g. brakes

Definitions

  • ABSTRACT A first lever has a roller at one end engageable with the typewriter carriage during its carriage return stroke and a second lever has a pad at one end also engageable with the carriage.
  • the first and second levers are connected together by a pin on the first lever slidable in a slot in the second lever, and a toggle spring urges the levers to one of two positions on either side of an overcenter position.
  • the carriage cngages with the roller of the first lever causing the levers to rotate thereby absorbing energy to decelerate the carriage.
  • the levers move past the overcenter position so that the roller disengages from the carriage and the pad, which was initially positioned out of the path of the carriage, is moved in front of the carriage.
  • the carriage engages with the pad and rotates the levers past the overcenter position to their initial positions thereby absorbing more energy and further decelerating the carriage.
  • the carriage is finally stopped by a fixed resilient stop member.
  • the present invention relates to a decelerating mechanism to gradually decelerate a body, such as a carriage or printing head of a typewriter to a stop.
  • the carriage or printing head of a printer or typewriter has a relatively large mass which causes a large shock to be developed when it returns to its initial position during the carriage return stroke.
  • a shock causes adverse effects such as the generation of noise and the reduction of the useful life of the printing head and other mechanical parts.
  • a prior art means to eliminate such shocks comprises a buffer spring or rubber member, either alone or in-combination with a cushioning air cylinder such that the kinetic energy of the printing head is transmitted to the buffer spring through a linkage or lever.
  • such means generally have drawbacks in that the absorption of kinetic energy from the printing head takes place rapidly to cause the development of secondary shocks or in that a relatively large space is required.
  • FIG. 1 is a plan view of a decelerating mechanism according to one embodiment of the present invention, in a first operative position;
  • FIG. 2 is similar to FIG. 1 but shows the mechanism in a second operative position.
  • a movable body 1 such as a carriage or printing head of a typewriter or printer, is slidably mounted on a guide track 2 so as to be movable back and forth in a predetermined direction.
  • the movable body 1 is arranged to move to the left (printing direction) a rather slow speed, and upon reaching the extreme left limit of its movement (not shown) to return to the right (carriage return stroke direction) at a relatively high speed until its initial position is reached.
  • An engaging member 3 having projections 3a and 3b is secured to the bottom of the movable body 1 as by screws 4.
  • a first lever member 5 is rotatably mounted at a pivot 6 to a fixed mounting plate 7, and rotatably carries a roller 8 at one end.
  • the roller 8 is engageable with the projection 3a of the engaging member 3, and is formed of a resilient material such as hard rubber.
  • a mass 9 for increasing the moment of inertia of the first member 5 is adjustably fixed to the other end of the first member 5 by means of a screw 11 which extends through an elongated slot 5a formed through the member 5.
  • the lower edge of the first member 5 is engageable with a resilient pad 12 which is secured to a stop 13, which is in turn fixedly mounted to the mounting plate 7 by means of a screw 14.
  • the first member 5 is partially channel-shaped, and a pin 15 is fixed to one side plate 5b thereof.
  • An overcenter biasing means or toggle 16 in the form of an open ring has one end connected to the pin 15 and its other end connected to a pin 17 which is fixedly mounted to the mounting plate 7.
  • the spring 16 urges the first member 5 to rotate counterclockwise, as viewed in Flg. 1, into engagement with the pad 12 of the stop 13.
  • the pin 15 slidably extends through a guide slot 18a formed through one end of a second lever member 18 which is rotatably mounted at pivot 19 to the mounting plate 7.
  • a resilient pad 21 is secured to the other end of the second member 18 for engagement with the projection 3b of the engaging member 3.
  • a stop 22 is disposed below the second member 18 and is secured to the mounting plate 7 by means of screw 23 for limiting the extent of rotation of the second member 18.
  • a resilient pad 24 is secured to the stop 22.
  • a resilient stop member 25 formed of an elastic material such as hard rubber, and mounted on fixed member 26 at a predetermined position.
  • the speed at which it engages with the roller depends on the position from which it starts its return motion, and is also influenced to a certain degr'ee by variations in lubrication with temperature as well as variations in the frictional resistance with wear between the movable body 1 and the guide track 2.
  • the pin 15 of the first member 5 is located slighly above an overcenter line 20 joining the pivot 19 of the second member 18 and the fixed pin 17 when the roller 8 is first engaged by the projection 3a of the engaging member 3.
  • the projection 3a of the engaging member 3 engages with the roller 8, rotating the first member 5 clockwise as viewed in FIG. 2. If the return speed of the movable body 1 is above a predetermined value, the impact shock imparted to the first member 5 will be great enough to cause it to rotate through an overcenter position at which the pin 15 lies on the overcenter line 20. The rotation of the first member 5 and the interlocked second member 18 is stopped by the abutment of the lower edge of the second member 18 against the pad 24, as shown in FIG. 2.
  • the mass 9 is mounted on the end of the first member 5, the moment of inertia of the first member 5 about the pivot 6 is high, so that much of the kinetic energy of the movable body 1 is absorbed by the initial rotation of the first member to decelerate the body.
  • the engaging member 3 engages with the first and second members 5 and 18 in two steps, and most of the kinetic energy of the movable body 1 is absorbed in causing reciprocatory rotary motion of the first member 5 which has a large moment of inertia.
  • the amount of kinetic energy absorbed by the mechanism depends on the angle of the leading edge of the projection 3a.
  • the decelerated movable body 1, with its kinetic energy greatly reduced, is stopped by the stop member 25.
  • the first member 5 When the speed at which the movable body 1 engages with the roller 8 is below the predetermined value, the first member 5 will be moved to an intermediate position between the first and overcenter posi' tions and returned to the first position shown in FIG. 1
  • the movable body 1 having its kinetic energy and speed reduced, will come to a stop against the stop member 25 without engaging with the second member 18.
  • the roller 8 In the initial position, the roller 8 will be held against a left beveled surface 3c of the projection 3a of the engaging member 3 by the force of the spring 16,
  • the present invention permits the kinetic energy of the movable body 1 to be absorbed gradually depending on the speed thereof, by means of a simple and compact mechanism. High precision as used in a conventional decelerating mechanism incorporating an air cylinder is not required. The movable body is also maintained in its initial position and prevented from rebounding by the mechanism.
  • a mechanism for decelerating a body movable in a predetermined direction comprising:
  • a first member pivotal about a fixed point between a first position in which the body engages with a part of the first member and a second position in which the body clears the first member during movement of the body in the predetermined direction;
  • first and second members being connected together so that when the first member is in its first position the second member is in its first position and when the first member is in its second position the second member is in its second position;
  • overcenter biasing means to urge the first member toward its first and second positions from an overcenter position between the first and second positions, the first and second members being initially in their respective first positions and the body engaging dur ing its movement in the predetermined direction with the part of the first member to pivot the first member past its overcenter position to its second position and thereby move the second member to its second position, the body engaging subsequently with the part of the second member to pivot the second member to its second position and thereby the first member past its overcenter position to its second position.
  • the first member comprises a lever, the part of the first member with which the body engages being a roller pivotally connected to one end of the lever.
  • the first member comprises a lever and a mass adjustably connected to the lever.
  • the overcenter biasing means is a toggle spring having one end connected to a fixed point and the other end connected to the pin.
  • the body is formed with a first part engageable with the part of the first member during movement of the body in the predetermined direction and a second part engageable with the part of the first member after the body is stopped in the predetermined position by the resilient stop, the force of the overcenter biasing means acting on the first member to maintain the part of the first member in engagement with the second part of the I body to hold the body in the predetermined position.

Landscapes

  • Vibration Dampers (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Vibration Prevention Devices (AREA)
US468076A 1973-05-14 1974-05-08 Typewriter carriage decelerator Expired - Lifetime US3923140A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5332573A JPS5311883B2 (enrdf_load_stackoverflow) 1973-05-14 1973-05-14

Publications (1)

Publication Number Publication Date
US3923140A true US3923140A (en) 1975-12-02

Family

ID=12939556

Family Applications (1)

Application Number Title Priority Date Filing Date
US468076A Expired - Lifetime US3923140A (en) 1973-05-14 1974-05-08 Typewriter carriage decelerator

Country Status (2)

Country Link
US (1) US3923140A (enrdf_load_stackoverflow)
JP (1) JPS5311883B2 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10683622B2 (en) * 2016-01-26 2020-06-16 Safe Rack Llc Gangway having position locking assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5527266Y2 (enrdf_load_stackoverflow) * 1975-08-28 1980-06-30
JPS5528815A (en) * 1978-08-21 1980-02-29 Nec Corp Printer
JPS5921592U (ja) * 1982-07-31 1984-02-09 日本精機株式会社 電球ソケツト装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2808144A (en) * 1955-03-04 1957-10-01 Royal Mcbee Corp Carriage retarding mechanism for typewriters or like machines
US2826287A (en) * 1954-12-30 1958-03-11 Ibm Control for a decelerating mechanism
US2854124A (en) * 1955-12-30 1958-09-30 Ibm Typewriter carriage decelerator
US2879879A (en) * 1954-12-29 1959-03-31 Ibm Decelerating mechanism
US3048255A (en) * 1959-06-03 1962-08-07 Sperry Rand Corp Means for cushioning carriage return and tabulation
US3260342A (en) * 1965-02-10 1966-07-12 Royal Typewriter Co Inc Carriage arresting device
US3444976A (en) * 1967-10-10 1969-05-20 Scm Corp Typewriter carriage decelerator
US3730323A (en) * 1969-08-04 1973-05-01 Brother Ind Ltd Repeat spacing mechanism for typewriters
US3735850A (en) * 1969-08-04 1973-05-29 Brother Kogyo Kk Nagoya Shi Repeat spacing mechanism for typewriters

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879879A (en) * 1954-12-29 1959-03-31 Ibm Decelerating mechanism
US2826287A (en) * 1954-12-30 1958-03-11 Ibm Control for a decelerating mechanism
US2808144A (en) * 1955-03-04 1957-10-01 Royal Mcbee Corp Carriage retarding mechanism for typewriters or like machines
US2854124A (en) * 1955-12-30 1958-09-30 Ibm Typewriter carriage decelerator
US3048255A (en) * 1959-06-03 1962-08-07 Sperry Rand Corp Means for cushioning carriage return and tabulation
US3260342A (en) * 1965-02-10 1966-07-12 Royal Typewriter Co Inc Carriage arresting device
US3444976A (en) * 1967-10-10 1969-05-20 Scm Corp Typewriter carriage decelerator
US3730323A (en) * 1969-08-04 1973-05-01 Brother Ind Ltd Repeat spacing mechanism for typewriters
US3735850A (en) * 1969-08-04 1973-05-29 Brother Kogyo Kk Nagoya Shi Repeat spacing mechanism for typewriters

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10683622B2 (en) * 2016-01-26 2020-06-16 Safe Rack Llc Gangway having position locking assembly

Also Published As

Publication number Publication date
DE2423382A1 (de) 1974-11-28
JPS5311883B2 (enrdf_load_stackoverflow) 1978-04-25
JPS501818A (enrdf_load_stackoverflow) 1975-01-09
DE2423382B2 (de) 1976-02-19

Similar Documents

Publication Publication Date Title
US3504623A (en) Hammer arrangement for high-speed printers
US3923140A (en) Typewriter carriage decelerator
US4847649A (en) Brake device for shutter
US2353057A (en) Printing mechanism
US2204187A (en) Time recorder
US3623587A (en) Type action drive
US3405624A (en) Photographic shutter
US3358806A (en) Escapement mechanism for typewriters
US1935436A (en) Typewriting machine
US3763987A (en) Line spacing device for typewriters
US3646870A (en) Device for braking of shutter blades or the like
US3048255A (en) Means for cushioning carriage return and tabulation
US3592312A (en) Type action drive
US2900062A (en) Device for adjusting the stroke force of the type bars in power-driven typewriters, bookkeeping machines and the like
US5172152A (en) Focal plane shutter
US2562214A (en) Platen press having curved impression member
US4430936A (en) Striker mechanism for a high speed serial printer
CN107097515B (zh) 单张纸胶印机前规及单张纸胶印机
CA1236339A (en) Backstop and damping apparatus for actuator
US4722622A (en) Damping apparatus for a print hammer mechanism
JP2917226B2 (ja) フォーカルプレーンシャッタ
JP2000024862A (ja) 自動工具交換装置の割り出し機構
US2858925A (en) Keyboard touch device
US3071233A (en) Shifting arrangement, particularly for typewriters
US3881412A (en) Printer for data processing machines