DE1983302U - PRINTING DEVICE. - Google Patents

Description

PATENT LAWYERS

DIPL-ING. HANS BEGRlCH · DIPi-JNG. ALFONS WASMEIER

REGENSBURG3 LESSINGSTRASSE 10

Patent Attorneys Bsgrich Wasmeier, 8400 Regensburg 3, Postfach 11

To the German Patent Office

Munich

Zweibrückenstrasse 12

Telephone 0941/31055
Bavarian. Staatsbank, Regensburg 507 Postal checking account: Munich 89369 Telegrams: Begpatent Regensburg

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I / g 6163

Day

2nd January 1968

W / He

IHTERIATIOIAL COMPUTERS AETD TABULAfORS LIMITED, I. C.T. House,

Putney, London, S.W. 15, England.

Printing facility

The innovation relates to printing equipment and, more particularly, to printing hammer assemblies for use in conjunction with constantly moving type carriers «,

A printing device has already been proposed, beJ / Oer ein Recording medium, e.g. a document, at a printing station was advanced in the vicinity of a group of rotating type wheels, which each borrowed a series of different Carry characters that appear one after the other at the printing station. A transmission medium, e.g. a typewriter tape, is between the type wheels and the document at the printing station used. A group of print hammers is at the

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Printing station provided, one for each of the type wheels, and a character from a type wheel printed in such a way that the corresponding print hammer is pressed against the back of the document, thus continuously on the document an imprint of the character at the Printing station is achieved. The selection of a specific character to be printed can then be achieved by that the print hammer is actuated at the time at which the the desired characters run through the printing station.

It is necessary to increase the operating speed of a printing device of the type indicated above in order to keep pace with the output required for computers nowadays, and difficulties arise in the design of a device for operation with such a high level of security . In particular, it has been found that the magnetic circuits have been used previously for the actuation of D _r uckhämmern in this type of printing devices, do not permit operation with such a high Ge ** speed. In order to achieve a rapid response from print hammer arrangements, it is also often necessary to apply driving pulses of high current strength to the electromagnet of the print hammer arrangement. In addition, the application of such high drive currents with the frequency necessary to generate the required print repetition speeds led to errors in the solenoid coils due to overheating «

According to the present mooring is a pressure hammer device for "Use in a high-speed printer with a lot of" number of continuously rotating type wheels, each of which Characters in one line in sequence past a printing point at which the printing of a selected font

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character is made by a character wheel that a Associated print hammer against the type wheel by briefly exciting a magnet at the time when the selected one Character is at the pressure point, beats, through it characterized in that the print hammer assembly is a one-piece Component made of magnetic material with two approaches that the electromagnet has at least one coil on a thin Has coil carrier which is fitted tightly around one of the lugs that the print hammer is received by an armature, the is pivotably arranged on a block fastened to the one-piece component, the anchor arrangement preferably at a distance is held by the projections by means of a leather, and that the eihstückige component also has a front Ansehlag which is adjustable in such a way that the movement of the print hammer as a result of the excitation of the electromagnetic coil is limited «,

The device according to the innovation thus results in an electromagnet table operated print hammer assembly of improved performance. By using a construction in which a one-piece Magnetic component is provided, the magnetic shell improved in such a way that a high performance in operation and a good heat path to support heat dissipation is aimed, so that high excitation currents are applied to the magnetic coils. can be practiced. The coils themselves are designed in such a way that they support the rapid transfer of heat. The heat dissipation can can also be improved in that an alignment member for a Number of individual hammer components is provided, which then serves as a heat sink for all components. Other improvements that contribute to an improved working group are a Bearing for the anchor pivot pin, which has a very low friction has exercise coefficients, and the reduction of ^ i

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Moving contacts metal against metal by making resilient Buffer between the hammer and its front stop and between the armature spring and the link on which it acts, To be provided.

Below is the subject of the hiring in connection with an exemplary embodiment explained with reference to the drawing. Show it:

fig. 1 is a side view of a pressure hammer assembly;

Fig. 2 shows part of a modified embodiment of a printing hammer he arrangement on a larger scale, and

Pig. 3 shows, in schematic form, a perspective view of a Group of print hammer arrangements and their assignment in the company.

In Fig. 1, a hammer assembly has a one-piece component 1 made of magnetic material. This one-piece component 1 has a foot part 2, a head part 3, which is separated from the foot part 2 is arranged at a distance, and a web 4? the the foot and Headboards 2 and 3 connect «The general structure of the component 1 is chosen so that the web 4 at one end of the Foot «and head parts 2 and 3 is arranged so that these two See parts of the footbridge extending in the same direction »The Web 4 is thinner than the foot and head parts 2 and 3 and has parallel approaches 5, which extend into the space between the foot * »and head parts 2 and 3 ,, the approaches 5 are like this designed to form cores for a pair of electromagnetic coils 6.

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Each coil 6 is wound around a thin paper » Formed coil carrier 7, the winding and coil carrier 7 are encapsulated in epoxy resin after the winding is made has been. Thus, the entire coil arrangement 6 is then placed over one of the lugs 5 and the coil 6 fits into the projections 5 exactly. The windings are in series by the usual "flie * =" lowering "leads from the coils 6 to a pair of contact pins

8 laid. The contact pins are in the lußteil 2 of the one-piece Component 1 held and electrically isolated from the component 1 with the aid of insulating sleeves 9, the pins 8 over the sleeves

9 protrude outward from foot part 2 of component 1 »

A block 10 is attached to the head part 3 with the aid of a screw 11 of the one-piece component 1 attached. Block 10 takes one Trunnion 12 on and an anchor 13 is supported by the trunnion 12. The anchor is designed so that it can be operated in Ab * - dependence on the excitation of the magnetic coils 6 is attracted, so that it shifts into a position in which it has the ends the approaches 5 overridden. An extension 14 is on the anchor

13 is provided and a print hammer 15 is at the end of the extension

14 attached. The extension 14 is at right angles to Arranged direction in which the armature 13 extends so that the extension within the space between the river-> and head * - parts 2 and 3 lies. The print hammer is shaped to be extreme end protrudes beyond the end of the head part 3, as in the Pigur is down, and by moving the armature 13 it is moved into the bridging position shifted so that this extension is enlarged. The head part 3 of the one-piece component 1 receives a screw 16 which is arranged in such a way that it limits this movement of the printing hammer 15. Thus the screw forms

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an adjustable front stop for the print hammer.

The armature 13 is biased with the aid of a spring 17 so that it normally remains in a non-actuated position, in which he is offset from the ends of the A sentences 5 by a small distance. The spring 17 is a flat spring. those about a block 18 is attached to one end of the armature 13. The free end of the leather 17 acts against a pin 19 in the web 4 of the one-piece Component 1.

As in lig. 3 _s shown is built up multiple print hammer assembly äadurch that a group of the above-described arrangements are aligned above one another in a lateral relationship so that the ends of all the print hammer 15 lie in one line. Another group of assemblies is similarly mutually aligned and the two groups are arranged with respect to one another so that the print hammers of the first group are interposed between those of the second group so that a single line of print hammers is formed. In order to prevent stray magnetic fields from a hammer arrangement from affecting adjacent arrangements, each arrangement is provided with a shield 20 made of magnetic material (FIGS. 1 and 3). The shield 20 is expediently taken up by an adhesive layer that has been applied to the outer surface of the magnet coils 6 »

To put the individual print hammer assemblies in their place in the To obtain a multiple arrangement, an alignment member 21 is provided « hen. This alignment member 21 is trough-shaped and has in the bottom of the trough locking holes 22, which are used to accommodate the Yerbindungsstifte 8 and their insulating sleeves 9 are used, the Pins 9 penetrate the bottom of the trough. Die Druckhammeranord « Tensions are made in the alignment member by screws 23 and 24

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attached, the screw 23 through a hole 25 in the bottom of the Alignment member 21 in the foot part 2 of the one-piece component of the arrangement .r.? Extends and the vision hood 24 extends through / a hole in the The head part 3 extends into a screw-threaded hole 26 in the straightening member 21.

A number of resilient elements 27 are along the inner sides of the alignment member 21 is provided. Each of the elements is arranged near one of the anchors and aligned so that it forms a backstop for the anchor} to which it is assigned when the corresponding individual print hammer assembly is in its position in the trough has been fixed "

The multiple pressure hammer arrangement, which consists of a ■ · Number of individual hammer assemblies, which with the Alignment member are attached, with respect to a conventional umlau- * The supporting component (not shown), e.g. a group of Print wheels, each of which bears characters, added. the The arrangement is chosen so that the characters of a single wheel are successively moved past a print hammer, see above that a single character is selected for printing by the temporal actuation of the print hammer in the usual manner. As the speed of rotation of the type wheels is increased, the time it takes to operate a print hammer increases Is available, and it becomes necessary the speed for the response and for the actuation of the print hammer to increase so that a selected character is printed cleanly and in the exact position on a document «The Print hammer arrangement used according to the hiring, as above be * - = wrote an integral magnetic circuit in which the yoke and the magnetic cores and the pole pieces are parts of the individual, a " lumpy component 1 are so improved magnetic

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Shape properties. be achieved. This vea the construction results a magnetic circuit of high performance and small dimensions * - sings, and as the size is reduced, the mass of the moving parts can also be reduced so that a faster Operation is enabled.

The response and operating speed of the print hammer can also through the use of high excitation current pulses that the Solenoid coils 6 are abandoned * to be improved »Because the However, increasing the speed of rotation of the type wheels can result in a shorter operating period for the device the frequency with which the actuation pulses hit the solenoid to be abandoned, too. The combined influences of high Generate excitation current and faster pulse repetition speed an undesirable temperature rise in the solenoid coils β " Each of the coils is also wound on a thin bobbin 7, which is preferably made of paper and which is exactly in the Approach 5 fits, which forms the Polstüeke, so that the faster Heat transfer from the coil to the one-piece component 1 is made possible. If the arrangement is chosen so that the two opposite sides of the one-piece component and the alignment member are machined in such a way that a good Thermal contact occurs and when the alignment link is heavy and heavy « bust is formed, the alignment member results in a heat sink, so that the undesirable local temperature rise in the actuation coils of the individual hammer assemblies is greatly reduced will.

The change of contact point 8 and the associated insulation sleeves 9 to define the individual print hammer arrangements in the alignment member 21 gives the possibility that a Mehr & ch hammer arrangement can be built without the usual spacing

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combs are used to separate the individual print hammers must, so that the risk is reduced that the hammers touch the combs and, as a result, impairment of the an * - cause speaking speed, and that a simpler, easier to assemble and thus less expensive unit can be * · * is aimed.

The pressure hammer arrangement shown in Fig. 1 can be used in the in 2 can be modified to further increase performance. The pivot pin 12 is in the case of Fig., 2 in a sleeve

with

28 made of a material / very low coefficient of friction, e.g.

Polytetrafluoroethylene enclosed «, the sleeve then forms a Low friction bearings for the armature 13 «The armature spring 17 is from the pin 19, which is received by the one-piece component 1 " is separated by a resilient buffer 29 "The Puffei

29 serves to dampen any mechanically induced vibrations in the spring that would adversely affect the performance of the arrangement. The buffer 29 can, on the other hand, be made of a low-friction material in order to avoid any frictional losses caused by rubbing the spring 1 * / on the pin 19 Stop screw 16 executes bouncing movements, the screw 16 can be separated from the metallic contact with the print hammer 15 by a further flexible buffer 30, which is also made of a material with low friction «,

Claims (6)

Protection claims% 1. Print hammer device for use in a ho tight shrinkage * keitsdrucker with a multitude of continuously revolving type wheels, each of which is in one line of the row after passing a printing point where the printing of a selected characters from a type wheel. it is assumed that an associated print hammer is against the type wheel by briefly exciting a magnet at the point in time when the selected character is at the printing point. det, beats, daduroh. marked that the print hammer device * - »j device has a one-piece component (1) made of magnetic material with two lugs (5) that the electromagnet has at least one Has coil (6) on a thin coil carrier (7), which is tight around one of the approaches (5) is fitted that the print hammer (15) vonl an anchor (12) is added, which is integral with the on one Gen component (1) attached block (11) is pivotably arranged, the anchor arrangement normally at a distance from the front> - ■■ jumps (5) are held by means of a leather (17), and that the one-piece component (1) also has a front stop (16) on « which is adjustable so that the movement of the print hammer (15) is limited as a result of the excitation of the electromagnetic coil (6) » 2. Apparatus according to claim 1, characterized in that the one « lumpy component (1) receives an adjusting device which is arranged in such a way that it is connected to an alignment member (21) cooperates to determine the device " 3. Apparatus according to claim 2, characterized in that the lestj Adjusting device has two electrical contact pins (8), diej are connected to the solenoid and which with regard to insulation sleeves (9) are insulated, and that the insulating sleeves are electrically 11 2.1. 1968 ¥ / He i / g 6165 the pins (8) both compared to the single-stitch component (l) as electrically isolate from the alignment member (21) «, 4. gate direction according to claim 1, characterized in that the le « the (17) is a leaf spring which is fastened at one end to the armature (12) ″ and at the other end against a pin (19) acts, which is received by the one-piece component (1), and that a resilient buffer (29) between the spring (17) and the pin (19) is inserted « 5. Apparatus according to claim 1 or 4 »characterized in that a resilient buffer (30) between the print hammer (15) and the front stop (16) is inserted. 6. Multiple pressure hammer device according to claim 2, characterized in that that the alignment member (21) is formed so that it a plurality of one-piece components (1) receives and holds in their position, and that the one-piece components (1) each are fixed in thermal contact with the alignment member (21), which is designed to act as a heat sink for everyone square components (1) "