DE2030310C3 - Print hammer assembly - Google Patents

Description

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

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

It is also a print hammer arrangement of the introductory mentioned type known (GB-PS 993 658), in which also a pair of permanent magnets for each pressure point is provided, which are each arranged in the area of the hammer itself. So is here a comparatively expensive and complicated design is 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, has at least two pole pieces, which are at the ends of the magnet extend past, have opposite polarity and form at least one magnetic gap, which runs approximately in the plane of the print hammer movement parallel to the print line, essentially extends over the length thereof, and in the at least 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 is 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, which is on the outside adjacent pole piece is also U-shaped, the pole pieces extend past the ends of the magnet in such a way that two parallel magnetic gaps are formed substantially over the length of the print line, and that printing is carried out at every other printing position along the line by a print hammer , in which part of the circumference of its actuating coil is arranged in the same magnetic gap. In such an embodiment, two air gaps extending over the length of the printing line are formed with a single permanent magnet, into which the actuating coils can extend with part of their circumference. Furthermore, the loss of magnetic flux is minimal because the magnetic flux is concentrated on the magnetic gaps. In addition, the pole pieces lie against the entire pole of the magnet so that no magnetic flux can escape. Furthermore, the U-shaped design ensures that the magnetic flux lines caught by the pole pieces are guided to the magnetic gaps within the pole pieces.

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

"" ■ U-shaped permanent magnet is provided, which Sch d ° e thin dimension of its legs is iSeSert therethrough and bears against the outer side of the outer S fSgen pole piece, an additional U-shaped _M Pdstück is provided which on the outer side 5 £ Sfchen Moneten rests and extends past the ends of this additional magnet, the Sdt-n of the two permanent magnets, which are winded towards each other, are of the same polarity, the additional «- ^ε πΓυ-shaped pole piece with the other U-shaped io Po s" cf cooperates to two additional Martsoalte parallel to the first two magnetic gaps substantially over the length of the printing line to that printing at each printing position in a group of four adjacent printing positions 15 of the line by a printing hammer that rests on the two pole pieces D <e magnets are off They are made of any of the well-known ceramic magnetic materials and * ™ each which, by their thin subscription «^« ^ are so that their opposite poles s.ch at opposing surfaces be '^ - The magnets 15 are. ™ ™

arranged that their same

are and not a pole piece on surfaces ^

Polarity is applied Die Magnete «and

every pole piece attached to ^ Aujeme, "

The North Pole Stucco 13

only at the ^^^^

ten 15 and has the in F ι g. 1 dg

The pole pieces 13, 14 extend over

the magnets 15 out, and ^ειη * ^Η ^?

te print hammer assembly is obtained.

Se invention is described below with reference to the drawing for example explained

Fiel is a schematic overall view of a Favor _t en embodiment of the print hammer arrangement

Ä View of a

During the Mersieiiung u ^e _{M et by} three

^^ ίΑ ^ «Sn. of which

TeTdteS and the other two parts the Part the base and

Give 1 ^^ of _{four hammers} 9 «targe

^ et ^^ rmSdargestent printing device * has a conventional printing drum 1. which are provided with rows of type symbols on the circumference of the SSn The drum 1 is rotated by an unillustrated machine. A paper 2 becomes one

Place near drum 1 and across a line of pole pieces,

Each time a further line is to be printed, each belt 5 wraps around two rollers 7a and 7b, of which d, e is driven through a center not shown

According to FIG. 1 and 2, a hammer arrangement 8 is arranged next to the drum 1 adjacent to the printing line. In the hammer arrangement, a plurality of pressure hammers 9 m groups of each he hammers are arranged, which extend along the drum 1. The hammers 9 are supported by essentially U-shaped springs 10 which are mounted in a frame H, each hammer 9 being supported by one of the springs 10. An electrically excitable actuation coil 12 is attached to each hammer 9. One half of each coil 12 is in a magnetic field die
gen d «
zwa ^m

because

ken ^Ma g. ^{net 'sche} _p ^ ^{rf' n} '^

Peek between each paa _μ ^^ ^

and the coils κ «na in to _ * _neüschen Kraftli- ^ f ^" fde ^ nigen half of each of the pole pieces is located and

eat sat

«U« ner e ™ «^^ _{their E} ,

^ _chimg of current flow as well as reguJJ JJ ^ oni _tf | _{Wes moved} at right angles,

to direction de. Mag ^ ^ ^^

_{d moved away from this} , and ^ o _{direction of} flow.

Ground lines in each air gap in a direction opposite to the e ^^ ^ ^ _un

J ^^ _{to activate the} hammer in such a way that they ^therefore move J _en ^d _di ^U _e ^m _drum i 1 and on this up against * e l corresponding direction

suggest "each ^ P is opposite in which the excited J 8" _{over and over your t}

Coils' ⁿ « ^e \ _{in each group} of four ham-

^ rteiLU e ρ _{L e> such} as B. the shown

Place the print ribbon and a type label on the Drum 1 against each other. w.-ht «."

The magnetic field generating device consists of three pole pieces located at a distance from one another, namely two north pole pieces 13 and one pole piece 14, which is arranged between the north pole pieces 13 (F * 1). A permanent magnet 15 is arranged between j, = two adjacent ^ ^ Uk,

s. ^^ _{actuation part} , ₈ , from KunJ

fabric is formed so that all stop _parts 17 can be connected ^{along stone 8 eD while}

of the _{pressure points te} n an-

J ^ J _each actuating part 18 under one

S ^ stop part 17 arranged The spu-

Wn ^ ^ ^, ^ _{just and te} "we, se m das

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 fastened by fasteners 19. Each actuation coil 12 is activated when it activates its hammer

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

10 are bent, and the stop part 17 of the hammer strikes the paper 2. Each leg 10a one Spring 10 supports one of the two parts of a hammer 9 and is perpendicular to the part of the hammer arranged with 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 move the actuating part 18 along its length, and since the leg 10a of the spring attached to the actuating part 18 extends at right angles to it enables the leg 10a this movement of the actuating part 18, while turning it in all other directions supports. The stop member 17 must be along its length and at right angles to the plane de; Move paper. That leg 10a · of the spring 10, which is connected to the stop part J 7 and right is arranged at an angle to this, enables the move movement of the stop part in this direction.

Each hammer 9 is in its initial position returned by springing back from the paper, belt and drum. If it is desired, it can then be dampened to a standstill by briefly * Pulses are passed through in the right directions. This way we will get the ones on the reel The magnetic forces are used to stop the hammer.

For this purpose 2 sheets of drawings

Claims (3)

Patent claims: 1. Print hammer arrangement for printing at a plurality of printing points along a print line, with at least one permanent magnet and at least one print hammer elastically mounted in the stroke direction, 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 of their associated actuating coils can be operated optionally, characterized in that the permanent magnet (15) is arranged on the side of the print hammer (9) facing away from the printing point, has at least two pole pieces (13, 14) which extend past the ends of the magnet, have opposite polarity and form at least one magnetic gap which runs approximately in the plane of the print hammer movement parallel to the print line, extends essentially over the length thereof and into which at least part of the circumference of the actuation coils (12) of the print hammers extends 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 a further thin U-shaped permanent magnet (15) is provided which is magnetized through the thin dimension of its legs and on the outside of the outer U-shaped pole piece (14) rests an additional U-shaped pole piece (13) is provided, which rests 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 form two additional magnetic gaps parallel M the first two magnetic gaps and substantially the length of the 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 part of the scope of its actuation sp ule is arranged in a different one of the four magnetic gaps.