DE2030310B2 - Print hammer assembly - Google Patents

Description

The invention relates to a print hammer assembly for printing at a plurality of printing positions along a print line, with at least one permanent magnet and at least one in the stop direction elastically mounted print hammer, each print hammer having an actuating coil, which is arranged in the force field of the permanent magnet, so that the print hammers by excitation their associated actuation coils can be operated optionally.

A high-speed printing device is known (DT-AS 1 248 982), in which each print point in a print line a pair of magnets for actuating an electrodynamic pressure hammer is assigned to such an embodiment is necessarily very expensive and complicated

There is also a print hammer assembly of the aforementioned type known (GB-PS 993 658), in which a pair of permanent magnets is also provided for each pressure point, each in the area of the hammer itself are arranged. A comparatively expensive and complicated one is therefore also here Execution available

The object of the invention is to design a print hammer arrangement in a simpler manner. This task is solved according to the invention characterized in that the at least one permanent magnet on the remote from the pressure point Side of the print hammers is arranged, at least has two pole pieces extending past the ends of the magnet of opposite polarity have and form at least one magnetic gap, which is approximately in the plane of the print hammer movement runs parallel to the print line essentially over the length of which ei extends, and in the at least e: ^ part of the circumference of the actuating coils the print hammer reaches into it.

A print hammer assembly according to the invention only requires a single permanent magnet to to be able to print at every print point of a print line with a hammer, so that the execution as a whole is very simple

A preferred embodiment of the invention is characterized in that the permanent magnet U-shaped and magnetized through the thin dimensions of its legs, a pole piece is arranged between the legs of the U and a pole piece rests on the outside of the magnet, the on the outside adjacent pole piece is also U-shaped, the pole pieces are at the ends of the magnet extend past such that two parallel magnetic gaps extend substantially the length of the print line are formed, and that printing at every other printing position along the line by a print hammer is designed in which part of the circumference of its actuating coil is in the same magnetic gap is arranged. In such a design, two are over with a single permanent magnet The length of the print line extending air gaps formed in which the actuating coils with a part their scope can reach into. Furthermore, the loss of magnetic flux is minimal because of the magnetic flux is concentrated on the magnetic gap. In addition, the pole pieces lie against the entire pole of the magnet, so that no magnetic flux can escape. Furthermore, it is achieved by the U-shaped design that the lines of magnetic flux trapped by the pole pieces within the pole pieces to the magnetic gaps be guided.

Another preferred embodiment of the invention is characterized in that another thin

γ,

The permanent magnet is provided which rests against the two pole pieces The magnets 1 ⁿ ^ JfX thin dimensions of its legs are made of any of the known ceramic ma- * "* ^ iidert and is made on the outside of the external magnetic materials. They suiü thin leue, ¹ ^ S "if pole piece is applied, an additional U-shaped- which is provided through its thin dimension magnetisien ⁹ iTTsSck, which are on the outside 5, so that their opposite poles are in contact with their Ψ « ^ etching magnets and are in contact the opposite faces. T ^^ additional magnets extending past the magnets 15 are, as shown in Fig. » ^ersicn ^ _nd ° _t

^Flea n ^ er two permanent magnets, which are arranged so that their same poles are each other z "g ^ew ^ ⁵⁶⁰ * dnA of the same polarity, the additional" - and no pole piece on avenges opposite fTlifSe point piece with the other U-shaped .o Polarity is applied The magnets ¹⁵ are U-shaped like SXSmenarbeite ^ by two additional pieces of each pole piece, which is adjacent to the outer side area of the first two magnetic gaps. The north pole piece is 13 m in the middle »Λ» the length of the print line to only on the inside surface of the inner Magne-S rSS printing at each printing position in th 15 and has the form shown in Fig. 1. ^ Setoer Gruwe of four neighboring printing positions. ₅ The pole pieces 13, 14 extend beyond the ends of the line through a pressure hammer of the magnets 15, and one half of each act ^length leads to where part of the circumference of its coil 12 is arranged in the air gap between «SS? Each of the four pole pieces adjacent to the pole pieces is built up through one ^Ö Se. Here, too, the loss of size applies to such a U-shaped arrangement

"" S ^ ¹ ItSrSlISe view of a preferred- "ei" Part I Bas "" nd the other two TeHe d, e jAosfOhmnptom the print hammer arrangement - Scj ^ ld ^ U Md «. _{VonvierHämmenl9diirge} .

S _e Sri Zeil «gedmek. should be leather belt ™ f K ^ '^ fluS iSminklig moving ..

The hammers arranged themselves, along the Tromrnell Kraft ™ n demjLutt ρ ^ ^. ^ ^

an electrically excitable actuating coil 12 bee t.gt. Coils ^ den Lu p ^ ^

One half of each coil 12 is in a Magnetfelder- _ ^e ™ ^s · £ * ^ _{staggered {e} n location such. B. the shown ÄiHlSSrwiMer'U *: Sa "" ^ ¹

puts "" print tape and a type mark on the ^ t, na ^^ _{Actuation part} , ₁₈ , _{the one} from Kunst-Drum 1 against each other. , · ,, """fabric is formed. This means that all parts _can stop along the magnetic field generating means bes eht in fabric geD.Kie ι _17, d _true three spaced apart located Polstucken, the Dmckzeile ag _{Henden Luftsp} old annämlich two pole pieces 13 and a brew. _{5 &} d "^ turkey" _{each Betätigu} n _g steeply 18 under e.nern piece 14, the arrival geor between the pole pieces 13 AnschUgteil 17 arranged De Spugeordnet (Fig. 1). Between i ^ *% £% ££ Ϊ "" ^ ^{substantially} planar and m teilwe.se the pole pieces, a permanent magnet 15 is disposed,

one end of the plastic part 18 is embedded.

The plastic parts 18 are arranged like the coils 12 in planes that are substantially at right angles to the magnetic fields and run parallel to the pole pieces. The U-shaped springs are on the frame 11 Fixed by fasteners 19, each actuation coil 12 is activated when it is used to activate its hammer

9 is excited, in the plane of the plastic part 18 of a Hammer moved out of the space between the pole pieces. The legs 10a of the U-shaped springs

10 are bent, and the stop part 17 of the hammer strikes paper 2. Each leg 10a of a spring 10 supports one of the two parts of a hammer 9 and is arranged at right angles to the part of the hammer to which it is connected

As mentioned above, the actuating part 18 is in the same plane as the coil attached to it 12. The excitation of the coil 12 thus tends to to move the actuating part 18 along its length, and there the attached to the actuating part 18 Leg 10a of the spring extends at right angles to it, the leg 10a enables this movement of the actuating part 18 while supporting it in all other directions. The stop part 17 must be along move its length and at right angles to the plane of the paper. That leg 10a of the spring 10, which is connected to the stop part 17 and is arranged at right angles to this, enables the movement of the stop part in this direction.

Each hammer 9 is returned to its initial position by the fact that he is from the paper, the Tape and the drum springs back If desired, it can then be dampened to a stop by passing short pulses in the right directions through the coil attached to it will. In this way, the magnetic forces acting on the coil are used to the Stop hammer.

For this purpose 2 sheets of drawings

Claims (3)

Patent claims: 1. Print hammer assembly for printing at a plurality of print locations along an S Print line, with at least one permanent magnet and at least one in the direction of impact resiliently mounted print hammer, each print hammer having an actuation coil which is arranged in the force field of the permanent magnet, so that the print hammers by excitation their associated actuating coils can be operated optionally, characterized in that that the permanent magnet (15) on the side of the print hammer facing away from the printing point (9) is arranged, at least two pole pieces (13, 14), which are located at the ends of the Magnet extend past, opposite polarity have and form at least one magnetic gap, which is approximately in the plane of the print hammer movement runs parallel to the print line, extends essentially over its length and in the at least part of the circumference of the actuating spool (12) the print hammer reaches into it 2. Print hammer assembly according to claim 1, characterized in that the permanent magnet (15) is U-shaped and magnetized through the thin dimensions of its legs, a pole piece (13) is arranged between the legs of the U and a pole piece (14) on the outside of the magnet, the pole piece (14) lying on the outside is also U-shaped, the pole pieces extend past the ends of the magnet in such a way that two parallel magnetic gaps in the are formed substantially over the length of the print line, and that printing on every other Printing position along the line is carried out by a print hammer, in which part of the circumference its actuating coil is arranged in the same magnetic gap 3. Print hammer assembly according to claim 2, characterized in that another thinner U-shaped permanent magnet (15) is provided, which by the thin dimensions of its legs is magnetized therethrough and rests against the outside of the sweeter U-shaped pole piece (14), an additional one U-shaped pole piece (13) is provided, which is on the outside of the additional magnet and extends past the ends of the additional magnet, the sides of the two Permanent magnets facing each other are of the same polarity, the additional U-shaped Pole piece cooperates with the other U-shaped pole piece (14) to create two additional magnetic gaps parallel to the first two magnetic gaps and essentially over the length of the To form print line, and that printing at each print position in any group of four adjacent Print positions along the line is carried out by a print hammer, in which a part of the circumference of its actuating coil is arranged in a different one of the four magnetic gaps is.