US3755700A - Electromagnetic drive - Google Patents
Electromagnetic drive Download PDFInfo
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- US3755700A US3755700A US00245897A US3755700DA US3755700A US 3755700 A US3755700 A US 3755700A US 00245897 A US00245897 A US 00245897A US 3755700D A US3755700D A US 3755700DA US 3755700 A US3755700 A US 3755700A
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- armature
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- 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
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
- B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
- B41J2/27—Actuators for print wires
- B41J2/285—Actuators for print wires of plunger type
Definitions
- ABSTRACT An electromagnetic drive for the needle of a needle printer comprising a pair of cylindrical magnet pole shoes disposed within a cylindrical'magnet coil and connected with the needle.
- the present invention relates to needle printing devices and more particularly to electromagnetic drive for the needle of such devices.
- Electromagnetic drives are used for causing a needle moved by them to stroke an ink support so that ink is transferred to a record support inserted behind the ink support.
- Mosaic-like arrangement and selective triggering of several electromagnetic drives allows the recording of characters.
- Needle printers are often used in data processing machines to print data on a record support. It frequently happens, especially in the case of bookkeeping machines, that the same needle printer has to record consecutively on record supports of different thickness.
- a blank form can be arrangedon one side of the printing area and a copybook on the other side whereby records are to be made on both record supports.
- the quality of the record depends upon the distance between the printing tips of the needles and the record support as well as upon the force exerted each time on the needle. Furthermore, the speed of the printing process depends upon the speedwith which the drive for the needles responds so that the recording frequency is limited by the type of the respective drive.
- the present invention has as its object the design of an improved electromagneticdrive for the needle of a needle printer which without change of its setting, applies records of equal quality to record supports of different thickness and which has an increased operating frequency as compared to known arrangements.
- an electromagnetic drive according to the invention is so designed that within a cylindrical magnet coil, opposed in the longitudinal direction of the magnet coil, there are arranged two cylindrical magnet pole shoes, displaceable in the longitudinal direction of the magnet coil, connected with the me dle, and having the end that is remote from the needle pressed against a damping element by a spring when the magnet coil is without current.
- the spring cooperating with the damping element urges the armature into cylindrical magnet pole shoes so-as to prevent vibrations during the return motion from the operating position to the resting position.
- the damping element absorbs the total energy acting during the return motion of the armature.
- the spring can be so dimensioned that different deflections are possible which essentially are determined by the distance between the record support and the printing tip of the needle which is connected with the armature. Then, it is advantageous to use as spring a helical spring having, for the most part, cons tant tension over different lengths of deflection.
- the armature of the drive can consist of a segment having magnetic conductivity and a segment not having magnetic conductivity whereby each segment is disposed within one respective magnet pole shoe when the magnet coil is without current.
- the magnetically non-conductive segment performs the function of providing an air gap in which the magnetic field moving the armature becomes effective.
- this segment can advantageously serve for guiding the armature because its connection with the magnetically conductive segment and its disposition in the other magnet pole shoe can ensure that the longitudinal movement of the total armature takes place free from canting and without interference.
- the magnetically nonconductive segment can be so designed that it forms a chamber receiving the helical spring. Thereby, the helical spring is firmly enclosed, and the motion of the total armature within the magnet coil attains further precision.
- the special design and arrangement of the armature which so-to-speak, is suspended between both end positionsresults in a very fast response of the drive.
- the responding motion is practically free from vibrations since the armature is supported on one side by the spring.
- the fast response can be even improved when the space surrounding the armature between the magnet pole shoes is filled with a material having electric conductivity. Eddy currents arise in this material, when the magnet coil is switched on, hence, this material causes concentration of the magnetic field to the range of the armature whereby an increased action of force is exerted on the armature.
- a further measure for fast build-up of themagnetic field consists in that the magnet coil is surrounded by a metal sheath which is slotted in the longitudinal direction of the magnet coil and which is connected with spool flanges which have magnetic conductivity and connect the metal sheathwith the magnet pole shoes.
- the metal sheath serves for returning the magnetic flux via the spool flange.
- the slotting in the longitudinal direction of the magnet coil prevents the formation of eddy currents in the metal sheath so that the magnetic field build-up in the interior of the coil is not'delayed because of eddy currents.
- the needle can be introduced into the magnetic coilpassing through a threaded pin which makes possible adjustment of therange of movement of the armature and serves as an outer support for the spring. Adjustment of the threaded pin adjusts the degree of compression of the spring so that this adjustment makes it possible to attain an optimal adaptation of the working stroke of the armature to the various record supports of different thickness on which records have to be made.
- a damping disk the position of which can be adjusted by a threaded pin arranged on the magnet coil end that is disk with a central opening which communicates with.
- the magnetic drive illustrated in the drawing has a magnet coil 1 which is cylindrically formed.
- the magnet coil 1 is seated on a coil body consisting of two pole shoes 2 and 3 which are arranged in the interior of the magnet coil 1 and which are opposed by a certain distance.
- An armature is guided in the pole shoes 2 and 3 and consists of two segments 4 and 4a.
- the segment 4 is constructed of a material having magnetic conductivity while the segment 4a is constructed ofa material not having magnetic conductivity, e.g., plastic.
- the end of a needle 5 is attached to the armature and is passed through the segment 40 which is not magnetically conductive.
- the segment 4a is inserted into the magnetically conductive segment 4 and joined with it, for example, by cementing.
- the end of needle 5 can be likewise cemented whereby at the same time, it can be jammed between the two segments 4 and 4a in the interior of segment 4.
- the segment is designed cylindrically and to form a chamber for receiving a helical spring 6, the other end of which strikes a threaded pin 12.
- the threaded pin 12 is provided with a projection which corresponds to the inner diameter of the helical spring 6 so that during compression, the cylindrical form of the helical spring 6 is maintained by the chamber of the armature segment 4a as well as by the projection of threaded pin 12.
- the threaded pin 12 is provided with set nut 17 which permits adjustment of the threaded pin 12 within the magnet-coil 1. Such an adjustment also changes the position of the helical spring 6 so that the working stroke of the armature 4, 40 can be adjusted.
- the magnetically conductive piece 4 of the armature has a frontal area which is remote from the magnetically non-conductive segment 4a and which lies against a damping disk 7.
- the damping disk 7 is provided with a central opening 14.
- the disk 7 lies on an additional threaded pin 13 which can be adjusted outside of the magnet coil 1 by set nut 18.
- the threaded pin 13 is provided with a central bore 15 which communicates with the outer space of the drive and permits escape of the air compressed by the return motion of the armature.
- the space surrounding the armature between the two magnet pole shoes 2 and 3 is filled with a material having electric conductivity.
- a material having electric conductivity For this purpose, there can be provided, for example, a highly conductive copper ring 8 which upon switching on of the magnet coil 1, causes the formation of strong current eddies in its material.
- the current eddies concentrate the magnetic field arising between the pole shoes 2 and 3 to be within the range of the armature so that fast response of the drive is ensured. Moreover, the dynamic effect is thereby increased so that if necessary, the current required for feeding the drive can be reduced.
- the ends of the two pole shoes 2 and 3 are secured in place by two flange parts 10 and 11 and a metal sheath 9 that surrounds the magnet coil 1 and which is clamped between the flange parts 10 and 11.
- the metal sheath 9 can be provided with a slot (not shown) running in the longitudinal direction of the magnet coil l to prevent the formation of eddy currents.
- the ring 8 provided between the pole shoes 2 and 3 permits simple centering and distancing between the pole shoes 2 and 3. Furthermore, this ring determines the position of armature 4, 4a, so that the latter merely has to be inserted into the pole shoes 2 and 3 during assembly of the drive. However, a joint insertion of the pole shoes and the armature into the magnet coil is conceivable.
- the armature 4, 4a takes up a position between the two pole shoes 2 and 3 which deviates from the depicted position whereby the magnetically nonconductive segment 4a produces the equivalent of an air gap between the two pole shoes 2 and 3.
- the non-conductive segment 40 also has the effect of a guiding element which ensures that the total armature moves free from canting in the longitudinal direction of the magnet coil 1.
- the needle 5 is mounted in a guide 16 that extends into the threaded pin 12 and is displaced against the effect of the spring 6 by the motion of the armature 4, 4a.
- the threaded pins 12 and 13 permit adjustment of the working stroke in both limit positions of the armature 4, 40 by simply loosening and tightening the nuts 17 and 18 after corresponding rotation of the threaded pins 12 and 13. These adjustments also affect the operating speed of the drive because greater operating speed results in respectively longer operating time. Furthermore, the tension of the spring 6 is regulated so that adjustment of the threaded pins 12 and 13 can also serve for changing the printing quality at the printing tip of the needle 5.
- the above-described magnetically non-conductive elements should preferably be also electrically nonconductive in order to avoid the generation of eddy currents which can delay the build-up of the magnetic field moving the armature.
- An electromagnetic drive for the needle of a needle printer comprising a cylindrical magnet coil, an armature disposed within said coil and operable upon said coil being energized to move said armature axially with respect to said coil, said armature being connected to said needle such that axial, reciprocal movement of said armature produces corresponding movement of said needle, a pair of axially spaced cylindrical pole members disposed intermediate said armature and said coil, an electrically conductive cylindrical member encompassing said armature and disposed intermediate said spaced pole members; and said armature comprising a first member and a second member, said first member being joined to said second member and being magnetically conductive; said second member being magnetically and electrically non-conductive.
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Abstract
An electromagnetic drive for the needle of a needle printer comprising a pair of cylindrical magnet pole shoes disposed within a cylindrical magnet coil and connected with the needle.
Description
14R Pia-755,700
nited States Patent [191 Buschmann et al.
[451 Aug. 28, 1973 ELECTROMAGNETIC DRIVE Inventors: Hans Buschmann, Bensberg-Refrath; Erwin Mehlhart, Porz-Urbach; Emil Pomplun, Steinenbruck; Alfred Schwibbe, Cologne, all of Germany Assignee:- Nixdorf Computer AG, Paderbom,
Germany Filed: Apr. 20, 1972 Appl. No.: 245,897
Foreign Application Priority Data Apr 21, 1971 Germany ..P21 19415.0
US. Cl. 310/30, 310/14 Int. Cl. H02k 33/02 Field of Search 310/17,
References Cited UNITED STATES PATENTS 9/1964 Trench .f. ..3l0/30 FOREIGN PATENTS OR APPLICATIONS 1,254,388 11/1967 Germany 1,806,714 6/1970 Germany 'Primary ExaminerD. F. Duggan Attorney-Robert C. l-lauke. Ernest 1. Gifford et a1.
[57] ABSTRACT An electromagnetic drive for the needle of a needle printer comprising a pair of cylindrical magnet pole shoes disposed within a cylindrical'magnet coil and connected with the needle.
8 Claims, 1 Drawing Figure BACKGROUND OF THE INVENTION I. Field of the Invention a The present invention relates to needle printing devices and more particularly to electromagnetic drive for the needle of such devices.
ll. Description of the Prior Art Electromagnetic drives are used for causing a needle moved by them to stroke an ink support so that ink is transferred to a record support inserted behind the ink support. Mosaic-like arrangement and selective triggering of several electromagnetic drives allows the recording of characters.
Needle printers are often used in data processing machines to print data on a record support. It frequently happens, especially in the case of bookkeeping machines, that the same needle printer has to record consecutively on record supports of different thickness. For example, a blank form can be arrangedon one side of the printing area and a copybook on the other side whereby records are to be made on both record supports.
In the case of known needle printers, the quality of the record depends upon the distance between the printing tips of the needles and the record support as well as upon the force exerted each time on the needle. Furthermore, the speed of the printing process depends upon the speedwith which the drive for the needles responds so that the recording frequency is limited by the type of the respective drive.
SUMMARY OF THE PRESENT INVENTION The present invention has as its object the design of an improved electromagneticdrive for the needle of a needle printer which without change of its setting, applies records of equal quality to record supports of different thickness and which has an increased operating frequency as compared to known arrangements.
To achieve this object, an electromagnetic drive according to the invention is so designed that withina cylindrical magnet coil, opposed in the longitudinal direction of the magnet coil, there are arranged two cylindrical magnet pole shoes, displaceable in the longitudinal direction of the magnet coil, connected with the me dle, and having the end that is remote from the needle pressed against a damping element by a spring when the magnet coil is without current.
The spring cooperating with the damping element urges the armature into cylindrical magnet pole shoes so-as to prevent vibrations during the return motion from the operating position to the resting position. Thereby, the damping element absorbs the total energy acting during the return motion of the armature. On the other hand, the spring can be so dimensioned that different deflections are possible which essentially are determined by the distance between the record support and the printing tip of the needle which is connected with the armature. Then, it is advantageous to use as spring a helical spring having, for the most part, cons tant tension over different lengths of deflection. Thus, the use of an electromagnetic drive according to the invention makes it possible to print on record supports of different thickness in a basic position. The arrangement of the armature within cylindrical pole shoes makes possible a very simple assemblage of the drive, for essentially, only the magnet pole shoes and the armature have to be installed in the interior space of the magnet coil; thereby, the adjustment of these individual elements in relation to each other is not critical since the final setting'is determined by the arrangement of the spring and the damping element. However, this final setting can be easily obtained by external setting elements. Thus, an electromagnetic drive according to the invention is excellently suitable for mass production.
According to a further embodiment of the invention, the armature of the drive can consist of a segment having magnetic conductivity and a segment not having magnetic conductivity whereby each segment is disposed within one respective magnet pole shoe when the magnet coil is without current. Then, the magnetically non-conductive segment performs the function of providing an air gap in which the magnetic field moving the armature becomes effective. Besides, this segment can advantageously serve for guiding the armature because its connection with the magnetically conductive segment and its disposition in the other magnet pole shoe can ensure that the longitudinal movement of the total armature takes place free from canting and without interference. When a helical spring is used, the magnetically nonconductive segment can be so designed that it forms a chamber receiving the helical spring. Thereby, the helical spring is firmly enclosed, and the motion of the total armature within the magnet coil attains further precision.
The special design and arrangement of the armature which so-to-speak, is suspended between both end positionsresults in a very fast response of the drive. The responding motion is practically free from vibrations since the armature is supported on one side by the spring. The fast response can be even improved when the space surrounding the armature between the magnet pole shoes is filled with a material having electric conductivity. Eddy currents arise in this material, when the magnet coil is switched on, hence, this material causes concentration of the magnetic field to the range of the armature whereby an increased action of force is exerted on the armature. A further measure for fast build-up of themagnetic field consists in that the magnet coil is surrounded by a metal sheath which is slotted in the longitudinal direction of the magnet coil and which is connected with spool flanges which have magnetic conductivity and connect the metal sheathwith the magnet pole shoes. The metal sheath serves for returning the magnetic flux via the spool flange. The slotting in the longitudinal direction of the magnet coil prevents the formation of eddy currents in the metal sheath so that the magnetic field build-up in the interior of the coil is not'delayed because of eddy currents.
In order tomake possible adjustment of the resting position and the'operating position of the armature within the magnet coil, the needle can be introduced into the magnetic coilpassing through a threaded pin which makes possible adjustment of therange of movement of the armature and serves as an outer support for the spring. Adjustment of the threaded pin adjusts the degree of compression of the spring so that this adjustment makes it possible to attain an optimal adaptation of the working stroke of the armature to the various record supports of different thickness on which records have to be made. Afurther possibility of adjustment arises when as adamping element, there is provided a damping disk, the position of which can be adjusted by a threaded pin arranged on the magnet coil end that is disk with a central opening which communicates with.
the outer space of the drive via a central boring of the threaded pin supporting the damping disk. This produces an air channel which during a fast return motion of the armature, avoids any elasticity that could be caused by compressed air.
DESCRIPTION OF THE DRAWING An example for carrying out the invention is subsequently described with the aid of the drawing which depicts a cross-section of an electromagnetic drive according to the invention. 7
DESCRIPTION OF A PREFERRED EMBODIMENT The magnetic drive illustrated in the drawing has a magnet coil 1 which is cylindrically formed. The magnet coil 1 is seated on a coil body consisting of two pole shoes 2 and 3 which are arranged in the interior of the magnet coil 1 and which are opposed by a certain distance. An armature is guided in the pole shoes 2 and 3 and consists of two segments 4 and 4a. The segment 4 is constructed of a material having magnetic conductivity while the segment 4a is constructed ofa material not having magnetic conductivity, e.g., plastic. The end of a needle 5 is attached to the armature and is passed through the segment 40 which is not magnetically conductive. The segment 4a is inserted into the magnetically conductive segment 4 and joined with it, for example, by cementing. During the same manufacturing operation, the end of needle 5 can be likewise cemented whereby at the same time, it can be jammed between the two segments 4 and 4a in the interior of segment 4.
The segment is designed cylindrically and to form a chamber for receiving a helical spring 6, the other end of which strikes a threaded pin 12. The threaded pin 12 is provided with a projection which corresponds to the inner diameter of the helical spring 6 so that during compression, the cylindrical form of the helical spring 6 is maintained by the chamber of the armature segment 4a as well as by the projection of threaded pin 12. Outside of the magnet coil 1, the threaded pin 12 is provided with set nut 17 which permits adjustment of the threaded pin 12 within the magnet-coil 1. Such an adjustment also changes the position of the helical spring 6 so that the working stroke of the armature 4, 40 can be adjusted.
The magnetically conductive piece 4 of the armature has a frontal area which is remote from the magnetically non-conductive segment 4a and which lies against a damping disk 7. The damping disk 7 is provided with a central opening 14. In turn, the disk 7 lies on an additional threaded pin 13 which can be adjusted outside of the magnet coil 1 by set nut 18. Thus, also at that end of the armature, it is possible to adjust the range of its motion. The threaded pin 13 is provided with a central bore 15 which communicates with the outer space of the drive and permits escape of the air compressed by the return motion of the armature.
The space surrounding the armature between the two magnet pole shoes 2 and 3 is filled with a material having electric conductivity. For this purpose, there can be provided, for example, a highly conductive copper ring 8 which upon switching on of the magnet coil 1, causes the formation of strong current eddies in its material. The current eddies concentrate the magnetic field arising between the pole shoes 2 and 3 to be within the range of the armature so that fast response of the drive is ensured. Moreover, the dynamic effect is thereby increased so that if necessary, the current required for feeding the drive can be reduced.
The ends of the two pole shoes 2 and 3 are secured in place by two flange parts 10 and 11 and a metal sheath 9 that surrounds the magnet coil 1 and which is clamped between the flange parts 10 and 11. The metal sheath 9 can be provided with a slot (not shown) running in the longitudinal direction of the magnet coil l to prevent the formation of eddy currents.
During assembly of the drive, the ring 8 provided between the pole shoes 2 and 3 permits simple centering and distancing between the pole shoes 2 and 3. Furthermore, this ring determines the position of armature 4, 4a, so that the latter merely has to be inserted into the pole shoes 2 and 3 during assembly of the drive. However, a joint insertion of the pole shoes and the armature into the magnet coil is conceivable.
When the magnet coil 1 is switched on, the armature 4, 4a takes up a position between the two pole shoes 2 and 3 which deviates from the depicted position whereby the magnetically nonconductive segment 4a produces the equivalent of an air gap between the two pole shoes 2 and 3. The non-conductive segment 40 also has the effect of a guiding element which ensures that the total armature moves free from canting in the longitudinal direction of the magnet coil 1. The needle 5 is mounted in a guide 16 that extends into the threaded pin 12 and is displaced against the effect of the spring 6 by the motion of the armature 4, 4a. When the magnet coil 1 is switched off again, the armature 4, 40 returns to its resting position.
The threaded pins 12 and 13 permit adjustment of the working stroke in both limit positions of the armature 4, 40 by simply loosening and tightening the nuts 17 and 18 after corresponding rotation of the threaded pins 12 and 13. These adjustments also affect the operating speed of the drive because greater operating speed results in respectively longer operating time. Furthermore, the tension of the spring 6 is regulated so that adjustment of the threaded pins 12 and 13 can also serve for changing the printing quality at the printing tip of the needle 5.
The above-described magnetically non-conductive elements should preferably be also electrically nonconductive in order to avoid the generation of eddy currents which can delay the build-up of the magnetic field moving the armature.
' Having described our invention, we claim:
1. An electromagnetic drive for the needle of a needle printer, comprising a cylindrical magnet coil, an armature disposed within said coil and operable upon said coil being energized to move said armature axially with respect to said coil, said armature being connected to said needle such that axial, reciprocal movement of said armature produces corresponding movement of said needle, a pair of axially spaced cylindrical pole members disposed intermediate said armature and said coil, an electrically conductive cylindrical member encompassing said armature and disposed intermediate said spaced pole members; and said armature comprising a first member and a second member, said first member being joined to said second member and being magnetically conductive; said second member being magnetically and electrically non-conductive.
2. The device as defined in claim 1 and including spring means urging said armature to a retracted position upon deenergization of said coil.
3. The drive according to claim 1, characterized in that the magnet coil is surrounded by a magnetically conductive metal sheath which is slotted in the longitudinal direction of the magnet coil and connected with magnetically conductive coil flanges which connect the metal sheath with the magnet pole shoes.
4. The drive according to claim 2, characterized in that said spring means is a helical spring.
5. The drive according to claim 4, characterized in that said second member of the armature forms a 6 chamber receiving the helical spring.
6. The drive according to claim 4, characterized in that the needle is passed into the magnet coil through a threaded pin which permits adjustment of the range i i i i UNITED STATES PATENT OFFIQE CER'HHEAIEE @F QOREQTIUN Patent No. 3, 755, 700 Dated August 28, 1973 InVent r(5) Hans Buschmann et a1 1 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
IN THE SPECIFICATION:
Col. 3, line 20, before "magnetic" insert ---electro--:-
line 30, after "armature" insert -4, 4aline 53, change "piece" to -segment line 60, after "armature" insert 4, 4a-- Col. 4, line 23, after "shoes" insert --2 and 3- line 24-, after "mature" insert --4, 4a
line 24, after "coil" insert l-- line 32, after "armature" insert 4, 4a line 54, after "armature" insert -4, la-- IN THE CLAIMS Col. 6, line 7, change "7" to 6- Signed and sealed this 18th day of December 1973.
(SEAL) Attest:
EDWARD Mo FLETCHER, JR, RENE Do TEGIMEYER Attesting Officer Acting Commissioner of Patents
Claims (8)
1. An electromagnetic drive for the needle of a needle printer, comprising a cylindrical magnet coil, an armature disposed within said coil and operable upon said coil being energized to move said armature axially with respect to said coil, said armature being connected to said needle such that axial, reciprocal movement of said armature produces corresponding movement of said needle, a pair of axially spaced cylindrical pole members disposed intermediate said armature and said coil, an electrically conductive cylindrical member encompassing said armature and disposed intermediate said spaced pole members; and said armature comprising a first member and a second member, said first member being joined to said second member and being magnetically conductive; said second member being magnetically and electrically non-conductive.
2. The device as defined in claim 1 and including spring means urging said armature to a retracted position upon deenergization of said coil.
3. The drive according to claim 1, characterized in that the magnet coil is surrounded by a magnetically conductive metal sheath which is slotted in the longitudinal direction of the magnet coil and connected with magnetically conductive coil flanges which connect the metal sheath with the magnet pole shoes.
4. The drive according to claim 2, characterized in that said spring means is a helical spring.
5. The drive according to claim 4, characterized in that said second member of the armature forms a chamber receiving the helical spring.
6. The drive according to claim 4, characterized in that the needle is passed into the magnet coil through a threaded pin which permits adjustment of the range of motion of the armature and serves as outer support for the spring.
7. The drive according to claim 7, characterized in that there is provided a damping disk, the position of which is adjustable by a threaded pin which is disposed at the end of the Magnet coil remote from the needle.
8. The drive according to claim 7, characterized in that the damping disk is provided with a central opening which is connected with the outer space of the drive via a central bore of the threaded pin supporting the damping disk.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2119415A DE2119415B2 (en) | 1971-04-21 | 1971-04-21 | Electromagnetic drive for the needle of a dot matrix printer |
Publications (1)
Publication Number | Publication Date |
---|---|
US3755700A true US3755700A (en) | 1973-08-28 |
Family
ID=5805409
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00245897A Expired - Lifetime US3755700A (en) | 1971-04-21 | 1972-04-20 | Electromagnetic drive |
Country Status (9)
Country | Link |
---|---|
US (1) | US3755700A (en) |
AT (1) | AT327591B (en) |
CH (1) | CH548643A (en) |
DE (1) | DE2119415B2 (en) |
FR (1) | FR2136583A5 (en) |
GB (1) | GB1343233A (en) |
IT (1) | IT957197B (en) |
NL (1) | NL7205172A (en) |
SE (1) | SE380914B (en) |
Cited By (14)
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US4010390A (en) * | 1974-05-24 | 1977-03-01 | Lucifer S.A. | Electromagnetic actuator comprising a plunger core |
US4157873A (en) * | 1976-12-07 | 1979-06-12 | Ricoh Co., Ltd. | Dot printing apparatus |
US4200401A (en) * | 1978-05-22 | 1980-04-29 | Ledex, Inc. | Print wire solenoid |
US4211496A (en) * | 1979-01-29 | 1980-07-08 | Small Business Administration | Printing solenoid |
US4272748A (en) * | 1978-05-22 | 1981-06-09 | Ledex, Inc. | Print wire solenoid |
US4308475A (en) * | 1978-07-18 | 1981-12-29 | Sundstrand Corporation | Solenoid pump adapted for noiseless operation |
US4329921A (en) * | 1979-08-20 | 1982-05-18 | Siemens Aktiengesellschaft | Damping device for an electromagnetically driven printing hammer |
US4441830A (en) * | 1982-03-29 | 1984-04-10 | Ncr Corporation | Printing solenoid |
US4468142A (en) * | 1982-11-12 | 1984-08-28 | Genicom Corporation | Pint wire actuator |
USRE31813E (en) * | 1978-05-22 | 1985-01-22 | Ledex, Inc. | Print wire solenoid |
US4523867A (en) * | 1983-07-25 | 1985-06-18 | Genicom Corporation | Bi-directional drive print wire actuator with forward-velocity and reverse-position closed loop feedback control |
US5071267A (en) * | 1986-08-14 | 1991-12-10 | U.S. Philips Corporation | Actuation magnet for a printing stylus of a matrix printer |
US5434459A (en) * | 1993-11-05 | 1995-07-18 | Magnetic Bearing Technologies, Inc. | Pulsed power linear actuator and method of increasing actuator stroke force |
US20080035871A1 (en) * | 2006-08-09 | 2008-02-14 | Shih Shin Technology Co., Ltd. | Solenoid arrangement |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US4018155A (en) * | 1975-06-02 | 1977-04-19 | Mohawk Data Sciences Corporation | Ballistic print hammer assembly |
DE2527186C3 (en) * | 1975-06-18 | 1980-10-09 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Mosaic printer with a cylindrical housing |
DE2640612C3 (en) * | 1976-09-09 | 1982-01-21 | Siemens AG, 1000 Berlin und 8000 München | Solenoid plunger magnet system and process for its manufacture |
DE2650873A1 (en) * | 1976-11-06 | 1978-05-11 | Philips Patentverwaltung | METHOD OF MANUFACTURING AN ELECTROMAGNET |
SE425067B (en) * | 1981-01-19 | 1982-08-30 | Facit Ab | PRESSURE HAMMER FOR PRINTERS AND PRINTERS |
DE4209967A1 (en) * | 1992-03-27 | 1993-09-30 | Bosch Gmbh Robert | Engagement relay for starting device for internal combustion engines |
US5890287A (en) * | 1996-01-10 | 1999-04-06 | Usui Kokusai Sangyo Kaisha Limited | Connection structure and process for connecting eye joints and slender metal pipes |
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US1992770A (en) * | 1934-02-12 | 1935-02-26 | Frank C Rathbun | Dental implement |
US2286176A (en) * | 1938-10-25 | 1942-06-09 | Earl Products Company | Motor assembly |
US2469137A (en) * | 1945-10-20 | 1949-05-03 | Waugh Equipment Co | Vibration indicator |
US3149255A (en) * | 1962-03-23 | 1964-09-15 | H & T Electrical Products | Electrical reciprocating motor |
DE1254388B (en) * | 1963-09-30 | 1967-11-16 | Siemens Ag | Printing unit for printing characters composed of a large number of points |
US3372262A (en) * | 1963-12-24 | 1968-03-05 | Livshits Abram Lazarevich | Hydrosolenoid unit for electroerosion machines |
DE1806714A1 (en) * | 1968-11-02 | 1970-06-25 | Philips Electrologica | Printing unit for on-the-fly printing of characters |
-
1971
- 1971-04-21 DE DE2119415A patent/DE2119415B2/en not_active Withdrawn
-
1972
- 1972-04-18 NL NL7205172A patent/NL7205172A/xx unknown
- 1972-04-20 GB GB1833572A patent/GB1343233A/en not_active Expired
- 1972-04-20 CH CH585472A patent/CH548643A/en not_active IP Right Cessation
- 1972-04-20 US US00245897A patent/US3755700A/en not_active Expired - Lifetime
- 1972-04-20 AT AT349072A patent/AT327591B/en not_active IP Right Cessation
- 1972-04-20 IT IT7278/72A patent/IT957197B/en active
- 1972-04-21 FR FR7214152A patent/FR2136583A5/fr not_active Expired
- 1972-04-21 SE SE7205285A patent/SE380914B/en unknown
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US235948A (en) * | 1880-12-28 | cheever | ||
US1128036A (en) * | 1912-08-29 | 1915-02-09 | Louis Paulero | Electric implement. |
US1992770A (en) * | 1934-02-12 | 1935-02-26 | Frank C Rathbun | Dental implement |
US2286176A (en) * | 1938-10-25 | 1942-06-09 | Earl Products Company | Motor assembly |
US2469137A (en) * | 1945-10-20 | 1949-05-03 | Waugh Equipment Co | Vibration indicator |
US3149255A (en) * | 1962-03-23 | 1964-09-15 | H & T Electrical Products | Electrical reciprocating motor |
DE1254388B (en) * | 1963-09-30 | 1967-11-16 | Siemens Ag | Printing unit for printing characters composed of a large number of points |
US3372262A (en) * | 1963-12-24 | 1968-03-05 | Livshits Abram Lazarevich | Hydrosolenoid unit for electroerosion machines |
DE1806714A1 (en) * | 1968-11-02 | 1970-06-25 | Philips Electrologica | Printing unit for on-the-fly printing of characters |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4010390A (en) * | 1974-05-24 | 1977-03-01 | Lucifer S.A. | Electromagnetic actuator comprising a plunger core |
US4157873A (en) * | 1976-12-07 | 1979-06-12 | Ricoh Co., Ltd. | Dot printing apparatus |
USRE31813E (en) * | 1978-05-22 | 1985-01-22 | Ledex, Inc. | Print wire solenoid |
US4200401A (en) * | 1978-05-22 | 1980-04-29 | Ledex, Inc. | Print wire solenoid |
US4272748A (en) * | 1978-05-22 | 1981-06-09 | Ledex, Inc. | Print wire solenoid |
US4308475A (en) * | 1978-07-18 | 1981-12-29 | Sundstrand Corporation | Solenoid pump adapted for noiseless operation |
US4211496A (en) * | 1979-01-29 | 1980-07-08 | Small Business Administration | Printing solenoid |
US4329921A (en) * | 1979-08-20 | 1982-05-18 | Siemens Aktiengesellschaft | Damping device for an electromagnetically driven printing hammer |
US4441830A (en) * | 1982-03-29 | 1984-04-10 | Ncr Corporation | Printing solenoid |
US4468142A (en) * | 1982-11-12 | 1984-08-28 | Genicom Corporation | Pint wire actuator |
US4523867A (en) * | 1983-07-25 | 1985-06-18 | Genicom Corporation | Bi-directional drive print wire actuator with forward-velocity and reverse-position closed loop feedback control |
US5071267A (en) * | 1986-08-14 | 1991-12-10 | U.S. Philips Corporation | Actuation magnet for a printing stylus of a matrix printer |
US5434459A (en) * | 1993-11-05 | 1995-07-18 | Magnetic Bearing Technologies, Inc. | Pulsed power linear actuator and method of increasing actuator stroke force |
US20080035871A1 (en) * | 2006-08-09 | 2008-02-14 | Shih Shin Technology Co., Ltd. | Solenoid arrangement |
US7431263B2 (en) * | 2006-08-09 | 2008-10-07 | Shin Shin Technology Co., Ltd. | Solenoid arrangement |
Also Published As
Publication number | Publication date |
---|---|
NL7205172A (en) | 1972-10-24 |
FR2136583A5 (en) | 1972-12-22 |
ATA349072A (en) | 1975-04-15 |
DE2119415A1 (en) | 1973-01-18 |
AT327591B (en) | 1976-02-10 |
GB1343233A (en) | 1974-01-10 |
SE380914B (en) | 1975-11-17 |
IT957197B (en) | 1973-10-10 |
DE2119415B2 (en) | 1975-09-25 |
CH548643A (en) | 1974-04-30 |
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