DD142316A1 - PRESSURE MAGNETIC UNIT FOR TYPE PRINTING IN SERIAL PRINTS - Google Patents

Abstract

The invention relates to a pressure magnet unit for the type printing in serial printing units, in particular for use in type plate printing units, the solenoid coil, the magnetic coil body and anvil mounted and formed as a plunger anchor pressure hammer and a U-shell and plate containing iron circle, with the task of a large Achieve stroke to apply the pressure energy in a short time, bring about a quick reassurance of the anchor after the return to the basic position and allow easy adjustment. The solution according to the invention provides that the pressure hammer of the pressure magnet is flattened in the area of the type stop, guided in the mouthpiece of a guide cap and abuts in the rest position with its opposite end to compensate the rebound energy at a stop plate fitted in the spring-loaded stop body, and that the pressure magnet in an am Motor housing adjustable receptacle inserted formschlüssess and it is horizontally displaceable. - Fig. 1-

Description

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Title of the invention

Printing magnet unit for type printing in serial printing units

Field of application of the invention

The invention relates to a printing magnet unit for type printing in serial printing units, in particular for use in type plate printing units. The type disc of such a printer consists of star-shaped type fingers, which, after the relevant type finger has been placed in the printing position, must be moved by a magnet for the purpose of printing in the direction of the paper to be printed, wherein the pressure magnet, a magnetic coil in the magnetic coil body and Anvil mounted and formed as a plunger anchor pressure hammer and an existing of U-sheath and plate iron circle contains.

Characteristic of the known technical solutions

From DE-OS 26 45 498 and US-PS 40 37 532 a pressure mechanism is known as a hinged armature printing mechanism, the hammer is slidably guided in a sleeve for a reciprocation to the recording material and away from it. The sleeve is secured to a support assembly and a compression spring, surrounding the hammer, anchored to it so that it with its end to an inner collar

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the sleeve engages when the hammer to the recording material moves forward. The hammer driver comprises an armature-shaped actuating arm pivotally mounted on the support arm in a predetermined position for urging the hammer forwardly toward the recording material in response to the energization of an electromagnet. Under rest conditions, the hammer is held in contact with the actuation arm under the bias applied by the spring so that the actuation arm is pressed against a return stopper attached to the support assembly. On the other hand, the electromagnet is arranged on the support assembly so that its poles are facing a pole piece of soft iron, which is supported by the actuating arm. Therefore, when an exciting current is applied to the electromagnet, the actuating arm is pivoted against the bias applied by the spring so that the pole piece engages the magnetic poles. Further, when the pole piece approaches the poles of the electromagnet, the actuator drives the hammer against the preload, the spring voltage forward.

The known from the aforementioned solutions hinged armature pressure mechanism requires due to its high Teileintensität a higher production cost, the plurality of functional elements engaged with each other is thereby more expensive both in the Dustage and in the damping of the movable elements. The 21 58 263 known Anschlagrnechanismus from DE-OS includes an assembly which consists of two circular parts, which form the cores of two electromagnets, which are assembled together via an intermediate piece in such a manner coaxially to form two almost completely closed magnetic circuits. This has the consequence that the illustrated stop assembly is very small and therefore easy to know and yet has a high energy efficiency. On

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elongated stop hammer is provided with a head which is connected via a sliding in the axial direction of the cores of the two electromagnets connecting rod with a flywheel. In this assembly, the flywheel for the operation of the stop hammer between a first electromagnet and a second electromagnet, wherein the two electromagnets are arranged in opposite directions, so that they act successively on the flywheel. The excitation of the electromagnet causes the propulsion for the stop of the stop hammer, while the excitation of the electromagnet causes the rapid return of the stop hammer in its rest position.

This built-up of two opposing magnets working stop mechanism for obtaining a type imprint when using type wheels is not suitable due to its massive design for such serial type printing works that carry the stop mechanism on a movable print carriage. Another disadvantage is to be seen that at the chosen ratio between the guided and ungauged length of the print hammer this is vibrated and thereby, especially in type carriers with closely spaced type fingers, unwanted Typabdrucke generated. At the same time, this known solution does not satisfactorily solve the problem of rapid processing of the print hammer after »type impression. The well-known from DE-OS 23 14 580 solution shows a working principle according to the Tauchankerprinzip actuating mechanism for generating a Typenabdruckes. This actuating mechanism includes a solenoid and a plunger member having a cam or guide surface at its free end. The plunger member is disposed between a first position in which it, with its guide surface end in the, path of the protruding pins of the type

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Rades engages, and a second position in which it is retracted, movable or displaceable. Stops limit the movement stroke of the plunger member. The plunger member is slid into the second position upon receipt of signals from the amplifier in the first position and by interaction between the guide surface end and the protruding pins. A spring with a relatively low spring constant is stretched between the guide member and a mechanical fixed point. The purpose of the spring is to maintain the guide member in the fully retracted position so that it can not move forward as a result of vibration or other influences such as gravity (when the plunger member is inclined relative to the horizontal).

This actuating mechanism operating according to the plunger-type principle has a number of disadvantages in its application for producing a printed image in high-speed serial printers. Thus, the solenoid used for this solution due to its simple structural design no recognizable Oustagemöglichkeit the. On a type element directed plunger and granted due to the resilient suspension of the entire plunger member no security with respect to an unwanted spring back in the direction of passing type disc,

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The aim of the invention is to provide a simple and space-saving magnet, which is still reliable and has the required life.

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Explanation, the essence of the invention Technical task

The technical problem is that the required large stroke is achieved by the created Druckmagneteinheit, the required pressure energy is applied in a short time and a rapid reassurance of the anchor is guaranteed after returning to the normal position. In addition, the magnet is to be arranged so that a precise uptake is possible in a simple manner.

Features of the invention

According to the invention, the object is achieved in that the pressure hammer of the pressure magnet flattened in the range of the type stop, is guided in the mouthpiece of a guide cap and abuts in the rest position with its opposite end to compensate for the rebound energy to a fitted in the spring-loaded stop body stop plate and that the pressure magnet in one on the motor housing adjustable receptacle inserted form-fitting and is horizontally displaceable therein. Other features are the fact that the guide cap has a rechteckförtnige recess in the mouthpiece, which closes with the print hammer, that the guide cap is adjustably fixed with its flange on the U-coat, and that the guide cap beveled in the mouthpiece to reject the type finger is. A particular embodiment is that guide cap and magnet coil body are integrally formed and made of an abrasion-resistant plastic. Furthermore, the features according to the invention include that the spring-loaded on the Platts attached stop body compression springs

has, which are supported on the stopper body and fasteners and that the stopper body has a central bore as Dustieröffnung for the print hammer and that the receptacle has rectangular recesses for fixing and securing position for solenoid and U-coat, lateral recesses for the topping in the horizontal plane has and carries ribs and that the receptacle for adjusting the pressure magnet has a form-fitting on the motor housing receiving foot with slots.

Example 1

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawings: FIG. 1: a part of a serial printing unit in the printing position FIG. 2: a printing magnet in section

Fig. 3: a perspective view of the pressure magnet with recording Fig. 4: a pressure magnet with one-piece guide and receiving part for the print hammer.

The illustrated in Fig. 1 part of a .Seriendruckwerkes is arranged on a movable along the print line print carriage, this print carriage carries on its frame 1, the Typeneinstelleinheit 2 and the Druckmagneteinheit 3. The Typeneinstelleinheit 2 consists in the present embodiment of a motor housing 4, the is formed in the present embodiment as a stepper motor, wherein the drive shaft 5 carries a coupling part 6 for receiving the type carrier 7. For attaching and loosening the

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the drive shaft 5 plugged type carrier 7, a pivoting of the type setting unit 2 is provided together with the printing magnet unit 3 to the point 8 until reaching the system located on the print carriage 9.

The pressure magnet unit 3 in turn consists essentially of a receptacle 10, the magnetic coil 11 with iron circle, the print hammer 13, the guide cap 14 and the stopper body 15 and is attached with their arranged on the receptacle 10 receiving feet 16 on the housing 4 of the stepping motor. As shown in Fig. 1, the receiving feet 16 are provided on the receptacle 10 so that they follow forrnschlüssig the housing 4 of the stepping motor. In the assembled state, the pressure magnet unit · 3 extends beyond the free space reaching the type carrier 7.

The pressure magnet 39 (FIG. 2) provided for the pressure magnet unit 3 (FIG. 3) is based on the plunger armature principle, which due to its design according to the invention permits a relatively large working stroke necessary for the function as a pressure magnet 39. The armature 17 of the pressure magnet 39 is formed in its extension as a pressure hammer 13, wherein the magnet armature 17 in its plastic sheath 19, which has good sliding properties, and the print hammer 13 is guided in the anvil 20, the return spring 21 the armature 17 together with the print hammer 13 in his Rest position stops. To secure the print hammer 13 against rotation of the print hammer head 22 is guided in the rectangular recess 23 of the mouthpiece of the guide cap 14. The attachment of the guide cap 14 takes place on the U-shell 18 of the iron circle and allows accurate Dustierung the rectangular recess 23 and thus

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of the print hammer head 22 relative to the type element 24 of the type carrier 7 located in the printing position. For this purpose, the bores 25 are formed in the guide cap 14 in such a manner that a slight rotation of the guide cap 14 is possible. This twisting is done so far,. until the cross-sectionally rectangular print hammer head 22 is aligned with respect to the type element 24.

The plastic sheath 19 of the armature 17 has at its periphery approaches in the form of a magnetic coil body 19, between which the magnetic coil 11 is located. The magnetic coil body 19 including the magnetic coil 11 umlaufende U-sheath 18 of the iron circle carries at its ends a plate 27 with an opening provided for the armature 17 breakthrough 28- the anvil 20, the U-shell 18 with the final plate 27 eingeschemmten and the armature 17 form the required magnetic circuit.

In a particular embodiment of the guide cap 14 and formed as a plastic sheath 19 for the magnet armature 17 magnetic coil body is provided, as shown in Fig. 4, both parts of the printing magnet unit 3 in one piece as a print hammer guide 41 made of an abrasion-resistant provided with good sliding properties plastic. As a Dustxerelement and as anti-rotation for the print hammer guide 41 engages a pin 42 in a located on the U-shell 18 a recess.

When controlling the pressure magnet 39, the armature 17 with the print hammer 13 due to the magnetic field is built up against the force of

.. Return spring 21 attracted by the anvil 20 and together with the selected type element 24 against the

on the platen 12 supporting recording medium 26 thrown. The limitation of the Druckhammerhubes done by the pressure position befindliche type element 24, which generates a clean blur-free type impression by the small residence time at full contact pressure of the print hammer 13. The pressure required for the printing of a type element 24 is achieved by a coordinated ratio between the length of the stroke, the mass of the magnet armature 17 with the pressure hammer 13 and the exciter system necessary working stroke, whereby with the found pressure magnet unit 3 a working speed up to 60 stops per second is achieved

The Aufs.chlagenergie and the return spring 21 cause a quick return of Ma'gnetankers 17 with the print hammer 13. When springing back of the magnet armature 17 this strikes with its impact surface on the stopper body 15 inserted in the stop plate 29. The magnet armature 17 with the pressure hammer 13 is still inherent rebound energy is destroyed by the arranged on the plate 27 mass-spring system consisting of the aforementioned abutment body 15 and the stop plate 29. This mass-spring system is secured by means of fasteners 33 in the form of screws to the plate 27, that the immediate concern of the stopper body 15 by means of the force of compression springs 30, wherein the compression springs 30 are supported on the stop body 15 and the fasteners 33 , Between the stopper body 15 and the plate 27, a spacer 31 is inserted, which allows an adjustment of the necessary for the required power stroke of the magnet armature 17 air gap. The impact energy is transmitted to the impact body 15 on impact such that the armature 17 remains immediately after its impact in its rest position after impact. The

deflected mass-spring system can then swing out without affecting the armature 17. The print hammer head 22 is thereby prevented from an uncontrolled wedge in the run in front of the guide cap 16 type carrier 7. The located in the stopper body 15 central bore 37 is provided as Oustieröffnung for the print hammer 13 in particular for testing its ease of movement.

In order to reject any spring-back type fingers 3-2 when the type carrier 7 passes in front of the print head 22, the guide cap 14 is chamfered in the area of the mouthpiece. At the same time thereby destruction of such type finger 32 is prevented.

The formation of the measures provided for the pressure magnet 39 receptacle 10 allows a positive insertion of the pressure magnet 39 in the rectangular recess 40 and counteracts the constant pressure operation at the same time by the arranged ribs 38 adverse heating of the magnetic coil 11. For Oustage of the pressure magnet 39 used has the receptacle 10 lateral recesses 34 in which mounting screws 35 are provided which allow a dimensionally accurate displacement of the pressure magnet 39 in a horizontal plane by loosening, so that the predetermined distance between the mouthpiece of the guide cap 14 and the to be controlled Type element 24 of the type plate 7. can be set exactly. The receiving holes 16 located in the receiving holes are formed as slots 36, so that prior to attaching the Druckmagneteinheit on the housing 4 of the stepping motor in the circumferential direction, a shift of the printing magnet unit 3 can be done so far that an alignment of the.

Druckhammerkopfes 22 is guaranteed to type element 24,

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The advantages of the solution according to the invention can be seen in the fact that the proposed printing magnet unit 3 for generating a clean type imprint using the Tauchankerprinzips with simple means a large stroke, the required pressure energy and rapid reassurance of the armature 17 with the print hammer 13 and through the advantageous arrangement of the individual elements an easy to perform adjustment of the print hammer 13 to be printed type element 22 without any disassembly is achieved.

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Claims (9)

"12. Zl 1 4Ö claim A printing unit for printing type printing in a series printing units, in particular engine-equipped type printing units, which is arranged on a carriage movable in the line direction and generates with its displaceable from a rest position to a working position against a selected type element of the type disc print hammer on a recording medium, a type impression, wherein the Pressure magnet, a magnetic coil, which is mounted in the magnetic coil body and anvil and formed as a plunger anchor pressure hammer and an existing of U-sheath and plate iron circuit, characterized in that aer print hammer (13) of the pressure magnet (39) flattened in the area of the type stop, in the mouthpiece of a Guide cap (14) is guided and in the rest position with its opposite end to compensate for the rebound energy to a spring-loaded stop body (15) fitted stop plate (29) is applied and that the pressure magnet (39) in a motor at the use (4) adjustable holder (10) form-fit and inserted therein is horizontally displaceable * 2. Pressure magnet according to item 1, characterized in that the guide cap (14) in the mouthpiece has a rectangular recess (23) which terminates with the pressure hammer (13). 3. pressure magnet according to item 2, characterized in that the guide cap (14) is fastened with its flange on the U-jacket (18) adjustable. 4. pressure magnet according to item 1 to 3, characterized in that the guide cap (14) in the area - 13 - over , B t «* t ^ <y? of the mouthpiece for rejecting the type finger (32) is chamfered. 5. pressure magnet according to item 1, 2 and 4, characterized in that guide cap (.14) and magnetic coil body (19) are integrally formed and consist of an abrasion-resistant plastic. 6. Pressure magnet according to item 1, characterized in that the spring-loaded on the plate (27) fixed stop body (15) compression springs (30) which are supported on the stop body (15) and on fastening elements (33). 7. Pressure magnet according to item 6, characterized in that the stop body (15) has a central bore (37) as Dustieröffnung for the print hammer (13). 8. pressure magnet according to item 1, characterized in that the receptacle (10) has rectangular recesses (40) for fixing and securing position for magnetic coil (11) and U-sheath (18), lateral recesses (34) for the ^ adjustment in horizontal Level and ribs (38) carries. 9, pressure magnet according to item 1 and 8, characterized in that the receptacle (10) for adjusting the pressure magnet (39) has a on the motor housing (4) adapted form-fitting receiving foot (16) with slots (36). For this 2 pages drawings V! / t;