EP0113006B1 - Dämpfungsanschlag für die Druckhebelbetätigungsvorrichtung - Google Patents
Dämpfungsanschlag für die Druckhebelbetätigungsvorrichtung Download PDFInfo
- Publication number
- EP0113006B1 EP0113006B1 EP19830111410 EP83111410A EP0113006B1 EP 0113006 B1 EP0113006 B1 EP 0113006B1 EP 19830111410 EP19830111410 EP 19830111410 EP 83111410 A EP83111410 A EP 83111410A EP 0113006 B1 EP0113006 B1 EP 0113006B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- leg
- coil
- armature assembly
- pole face
- 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
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
- B41J9/00—Hammer-impression mechanisms
- B41J9/26—Means for operating hammers to effect impression
- B41J9/38—Electromagnetic means
-
- 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
- B41J9/00—Hammer-impression mechanisms
- B41J9/42—Hammer-impression mechanisms with anti-rebound arrangements
Definitions
- This invention relates to a print lever actuator mechanism and, more especially, such a mechanism wherein a critical air gap is maintained fixed without need for manual adjustment.
- a print lever arm may be connected to the armature or it may be used as the armature itself so that a print element, which is located on the opposite side of the armature from the coil, may be propelled towards a print medium whenever the coil is energized.
- the print element may be attached to the print lever arm or it may be positioned adjacentto but separated from the print lever arm. In the latter arrangement, upon energization of the coil the armature is attracted to the coil-wound section of the stator and the print lever arm is thrustforward striking the print element and causing it to impact the print medium.
- a problem that arises in the use of electromagnetic actuators is that the dimension of the air gap, i.e., the distance between the armature and the coil wound stator must be maintained fixed. This distance is critical in order to insure that the armature and hence the print element is activated only when a predetermined amount of current is passed through the coil. If the air gap is allowed to vary, the armature may not energize when it should and conversely, may energize when it should not.
- the present invention relates to a print lever actuating mechanism of the electromagnetic type.
- a coil wound around one leg of a stator causes an armature assembly to be attracted to the coil wound leg when current is passed through the coil.
- a print lever arm is connected to the armature such that when the coil is energized and the armature attracted to the coil wound leg, the print lever arm is thrust forward causing a print element to impact on a print medium.
- the end of the armature adjacent to the coil wound leg is located the width of an air gap away from the leg.
- the stator of the instant invention has three legs.
- a coil is wound around a first leg of the stator.
- the armature/print lever arm assembly pivots about the innermost leg of the stator.
- the third leg of the stator functions as a backstop to limit the movement of the armature/print lever arm assembly such that the width of the air gap is maintained fixed.
- the length of the third leg is determined by the width of the air gap that is required. As the air gap width increases, the length of the third leg correspondingly decreases.
- a piece of molded rubber or other resilient material is mounted on the end of the third leg to absorb the force of the armature/print lever arm assembly as it rebounds after being thrust forward.
- the print lever arm and armature may be formed in one piece so that the print lever arm is, in effect, the armature. Alternately, the print lever arm may be connected to the armature so that when the armature is activated, the print lever arm is likewise activated.
- the three legs of the stator may be collinear or they may be offset from one another depending on the particular design of the printer.
- a print lever actuating mechanism 24 of the electromagnetic type having armature 12 mounted atop stator 11.
- Print lever arm 13 is shown connected to armature 12.
- armature and print lever arm 13 may be formed in one piece or may be two separate pieces connected into one armature assembly 23 as shown.
- Stator 11 comprises three separate legs 15-17.
- Coil 19 is disposed about leg 17.
- Armature assembly 23 pivots about leg 16 while backstop 14 is mounted on the end of leg 15.
- Air gap 18 is the distance between the end of leg 17 and armature 12 when coil 19 is unener- gized and print lever arm 13 is resting against backstop 14 on the end of leg 15.
- Fig. 1 shows print wire 22, any type of print element that impacts a print medium may be employed to practice the instant invention.
- armature 12 is constructed of a plurality of laminations of magnetic iron while print lever arm 13 is constructed of a one-piece section of spring steel.
- Print lever arm 13 is connected to armature 12 by a plurality of small rivets not shown so as to form armature assembly 23.
- Armature assembly 23 is then fastened to leg 16 at pivot point 25 using a plastic hinge (not shown).
- One section of the plastic hinge is fastened to the underside of armature assembly 23 while the other section of the plastic hinge is fastened to the adjacent side of leg 16.
- print lever actuating mechanism 24 When no information is desired to be printed, print lever actuating mechanism 24 is at rest and its position is as shown in Fig. 1. At this time, either no current is flowing through coil 19 or insufficient current is flowing through coil 19 to cause any movement of armature assembly 23 from the rest position. Armature 12 is separated from leg 17 by a distance equal to air gap 18. The width of air gap 18 is determined by the length of leg 15 at the time of manufacture. As the length of leg 15 is decreased, armature assembly 23 pivots about leg 16 so as to increase the width of air gap 18. Conversely, as the length of leg 15 is increased, the width of air gap 18 decreases. Since the length of leg 15 will not change after stator 11 has been manufactured, the width of air gap 18 remains fixed after actuating mechanism 24 has been assembled.
- legs 16 and 17 are of equal length while leg 15 is of some length shorter than that of legs 16 and 17.
- the exact length of leg 15 is determined by the width of air gap 18 that is desired.
- An optimum range for the width of air gap 18 is 0,2/0,5 millimeters.
- Stator 11 may be manufactured, for example, by grinding down legs 16 and 17 until the top surfaces, also known as the pole faces, which are adjacent to armature 12 lie in the same plane.
- the top surface or pole face of leg 15 adjacent to print lever arm 13 may then be ground down to a predetermined distance below the plane of legs 16 and 17.
- the thickness of backstop 14 must be taken into account when grinding down leg 15.
- the sum of the thickness of backstop 14 and the length of leg 15 determines the width of air gap 18.
- the width of air gap 18 is determined solely by the length of leg 15.
- the preferred embodiment of the present invention comprises a ballistic type wire matrix printer wherein print wire 22 is used to print an information mark on a print medium. It will be recognized by those skilled in the art that any type of print element in any type of printer utilizing an electromagnetic actuator may be used to practice the instant invention. For example, a dot band or a chain printer using an electromagnetic actuator may be employed.
- Backstop 14 which is composed of a resilient material such as rubber, absorbs the force of print lever arm 13 as it returns to its rest position. Further, the backstop material does not wear in the print actuator environment. Accordingly, the air gap 18 remains constant.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Impact Printers (AREA)
- Electromagnets (AREA)
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US45430682A | 1982-12-29 | 1982-12-29 | |
US454306 | 1982-12-29 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0113006A2 EP0113006A2 (de) | 1984-07-11 |
EP0113006A3 EP0113006A3 (en) | 1986-08-20 |
EP0113006B1 true EP0113006B1 (de) | 1989-03-08 |
Family
ID=23804112
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19830111410 Expired EP0113006B1 (de) | 1982-12-29 | 1983-11-15 | Dämpfungsanschlag für die Druckhebelbetätigungsvorrichtung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0113006B1 (de) |
JP (1) | JPS59123678A (de) |
DE (1) | DE3379325D1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4852481A (en) * | 1988-07-14 | 1989-08-01 | L. James Hubbard | Print hammer mechanism |
DE102009020138B3 (de) | 2009-05-06 | 2010-12-02 | Institut für Luft- und Kältetechnik gGmbH | Verfahren zur Speicherung von Wasserstoff und Speicher für Wasserstoff |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2800218C2 (de) * | 1978-01-04 | 1980-02-07 | Triumph Werke Nuernberg Ag, 8500 Nuernberg | Nadeldruckkopf |
US4230412A (en) * | 1978-03-17 | 1980-10-28 | Helmut Falk | Matrix print head assembly |
IT1099489B (it) * | 1978-09-11 | 1985-09-18 | Honeywell Inf Systems | Testina stampante a matrice perfezionata |
JPS5722073A (en) * | 1980-07-15 | 1982-02-04 | Nec Corp | Spring charge type printing hammer |
-
1983
- 1983-11-04 JP JP20606283A patent/JPS59123678A/ja active Pending
- 1983-11-15 DE DE8383111410T patent/DE3379325D1/de not_active Expired
- 1983-11-15 EP EP19830111410 patent/EP0113006B1/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS59123678A (ja) | 1984-07-17 |
EP0113006A3 (en) | 1986-08-20 |
EP0113006A2 (de) | 1984-07-11 |
DE3379325D1 (en) | 1989-04-13 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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