DE2048704B2 - Method of manufacturing a molded plastic body containing a metal part - Google Patents

Description

To ensure the adhesion of a sprayed-on plastic 5 »or return spring;

To raise the body on a metal part, it is also F i g. 2 is a sectional view of the hammer and FIG

already known to roughen the metal part or with springs;

to coat a compound that promotes adhesion. Fig. 2A is an enlarged sectional view of a

For extreme, short successive shock load connection points between a spring and the cast

However, this is also the printing hammer removed by these measures.

aimed adhesion insufficient. From Fig. 1 it can be seen that the object of the invention is to move a hammer 28 carried 31 by a lever 17 to produce a metal-plastic movement when the electromagnet 54 is excited,
To create a bond in which a shock load is thereby achieved against a beige withstanding secure adhesion between plastic 60 for example on a moving type chain of material and metal. or another type carrier. This object is thereby removed according to the invention. A stop control member 44 limits the pressure releasing the vulcanization or crosslinking of the merbewigung, and the springs 31 bring it back into the adhesive on the metal part during or after the rest position. The electromagnet was made by hardening the plastic. 65 de-energized before pressure contact is reached. With this method it is possible to have metal spring stops 33 and 39 support the limiting-plastic connection by a single injection of the spring movement. The ends of the springs are to be produced by casting, during which the fastening elements 34 and 35 on the frame at the same time

3 ⁴

attached via pressure device. The fastening - whose diameter nut the ^^^^^^^

elements may contain an adhesive to ensure joint the ring-shaped leue, u · ^^ _the injection molding

stresses between the spring and the frame result in a hole ^{in this ring S ^ f 0} * ¹ _rt _j _urcn

absorb. is removed again, uas <"." _{deg berdts ef} _

Fig. 2 shows the hammer 28 with the after 5 is then by ^ again da-

Process 31 on him mounted springs mentioned the impact Snftes 30 ™ ^"lx r Λ" ^ _{ä & m Materia} i _of

Insert 41 can also be replaced by a type element, with an a “. _{fabric 60} coated

when a direct pressure is applied by one for each hammer body, the nut asm ~ subsequently

Type intended print hammer should be done. is, nineing ^ _{chllittsn into the hole will} . _{Of the}

In Fig. 2 A is the xo embedded in the hammer 28 on which the en ⁰ P ¹ * ^ jÄadSch are formed, the end of the spring 31 is shown. This end is ring-pin 30 ^k ^ \ ^ ^h . ^^ _hdiTQa polymeric material bent in the shape of a curve, by means of which the aiiftrelenden tension- that the hole with a ^ can be filled more evenly over the whole junction of the && ™ _ff Then distributed mnd a better mechanical bonding adhesive ^ve ^ ^en ^ _a g _e ^ ^re _or cross-linking this anchoring of the spring in the material of the hammer- 15 then a ™ f ™ \ ^e j £ * ° process called body is achieved will. The elastomeric adhesive 60 ^^^^ Z ^ Srclld therefore surrounds the spring and binds it to the material more economically than the former and the hammer body. Occurs due to the elastomeric vorzugt ^^^ '^ in ghrumpfen, the properties of the adhesive results in the fact ^ ^a Want that kem * ηξ ™ Φ _would the juncture a certain elasticity. The _u the diameter of the süttesverrmg ^ ^ pin 30, which is made of the same material as the urinary out F1 g. 2 A is ersicmucn, <w _{t v} merköiper can exist, results from the herden pin 30 when using «>« ^ fKSeS. position process for this connection that in proceedings föl- completely ^ § ^^ _ver proceedings no pen

^ Ji SD n? "Α ^ ° C. The process for manufacturing the printing hammer and forms a ^{Einhe '1} · consists essentially varies the coated with the adhesive, the shape of the Η ^^ ΑΪεΓ metal part in the molten Art 30 arbitrarily without embedding the tmn fabric from the pnnzip, which is then hardened to deviate. ^Αυβε ; ^ _α ° ™ ^ to form the earth's hammer body. This can ™ ^ ⁵ ° ^it ^ ^r gerweise take place in that the end of the adhesive inventive method are connected with the hammer-coated metal member in an injection mold more convenient locations than metal parts, the said springs. Hnrnmerköroers will be presented, the then 35 for the preparation is the Ha ^ "body mrü vo filled with the molten plastic in the usual manner. The preferably glasfaserverstark esNyUm ^ MIMO GewKhts metal part can be used per cent glass prior to pouring of the plastic. ^As ^ £ ° ^ 2 _n -Sfiauf any way be fixed in the Fom. advantages nitrile polymer, the Acrylnitnl em-butadiene Mod * preferably this can be done by a pen, contains ziermittei.

1 sheet of drawings

Claims (1)

1 2 molded plastic body, for example a printing claim: hammer, can be made. The thermal and / or chemically vulcanized into an elastomeric state A method for producing a metal part sier- or cross-linkable adhesive is used to containing molded plastic body, at 5 to create an elastic adhesive connection, the the one with a vulcanizable or vulnerable one that acts on the MetaU plastic connection elastomeric adhesive-coated end of the Me- shock load is able to absorb the through tallteiles encapsulated with plastic and then the contact produced by the method according to the invention When the plastic is hardened, between the uncured adhesive and the marked that the vulcanization io melted material of the hammer body and the or crosslinking of the adhesive on the metal- subsequent vulcanization or crosslinking of the Partly during or after the curing of the synthetic adhesive results in a much more intensive and even substance, the connection is more moderate than is possible by means of known processes
15 There is no problem for the specialist - th, suitable for the process according to the invention Select adhesives or mixtures of adhesives. The vulcanization or crosslinking can be partially or completely by the The invention relates to a method for the production of an injection molding process which acts on the adhesive len of a cast heat containing a metal part. However, it is also possible to use the VuI- Plastic body in which a vulcanization or crosslinking of the adhesive after the or crosslinkable elastomeric adhesive coating- hardening of the plastic body by a? special tes end of the metal part coated with plastic and to effect heat treatment. It is on it, however then the plastic is hardened. 25 ensure that the adhesive used corresponds to the In known processes for connecting the injection molding process, the temperatures occurring stand- Mstallteile with plastic parts hold the metal part, i. H. that no decomposition or an adverse partially poured into the plastic, whereby its adhesive properties are impaired,
cast-in piece of the metal part preferably so The adhesive coating can be in any way is shaped so that this can be mechanically applied in the plastic 30 to the metal part. Preferably is anchored. The manufactured in this way is first the metal part with trichlorethylene or Metal-plastic compounds, however, have degreased and removed from another cleaning agent. Disadvantage that a solution of the adhesive is applied slightly in the event of impact loads chen or loosen. and the solvent evaporates. These difficulties arise in particular with the use of plastic as a carrier body for the injection molding of the print hammer body for the expert in a large number of injection-molded print hammers from high-speed printers. These hem-castable plastics. Nylon reinforced with one or more springs is preferably used. Use here as an adhesive. Metal strips for epoxy resin modified with nitrile polymer are preferably used as the spring, one end of which is particularly suitable for the hammer. Polyurethane adhesives have been embedded in the body but have also been used successfully at their other end.
Frame of the printing device are attached. The invention is based on the drawing visits that wrote the known metallic hammer body, which refers to a preferred embodiment by replacing those made of plastic, which refers to easier example, in which in addition to the adhesive and cheaper to manufacture, but have none 45 binding a mechanical anchorage used has given satisfactory results, since the metal is used to fasten a spring to a pressure hammer body plastic connection, the strong and quick one-on-one. It shows other shock loads cannot cope with F i g. 1 is a schematic representation of a print, mechanism with a print hammer and holding