Method and apparatus for the attachment of clasps to letter envelopes
AssigneeWinkler & Dunnebier Maschinenfabrik und Eisengiesserei KG
InventorAlfred Doderer-Winkler
Life of this patent
Estimating the term…
Abstract
There is provided a method and apparatus for the attachment of clasps on letter envelopes incorporated into a machine for the manufacture of letter envelopes. The clasps, at the conclusion of the folding operation of the envelope machine, following the folding down of the lateral flaps of the envelope, are attached to the newly formed back sides of the letter envelopes. The apparatus is arranged for this purpose at the downstream end of a lateral folding mechanism of the envelope machine and includes a stationary opposing support plate.
Claims25
A method for attaching metal clasps to letter envelopes in combination with an envelope forming machine for manufacturing letter envelopes, said clasps having anchoring elements and being attached to the letter envelopes as the letter envelopes are moved in a direction of conveyance by the envelope forming machine during their manufacture,
- said envelope forming machine having in the manufacture of the letter envelopes a means for folding the lateral flaps of the envelope blank to form the back side of the envelopes;
- said method comprising:
- supplying said clasps in an uninterrupted succession from a supply magazine;
- advancing said clasps by a feed mechanism to an embossing roller disposed in said envelope forming machine at the end of the folding operation and;
- affixing said clasps by means of said embossing roller to the back sides of said envelopes;
- the affixing step including
- securing said clasps to the flaps forming the back sides of the letter envelopes with the anchoring elements of the clasps by means of a stationary support plate;
- opposing said embossing roller, said stationary opposing support plate being gripped in tube-like manner between the front and back sides of the letter envelope;
- the clasps being securely fastened to the back side of the letter envelope only when the contacting lateral flaps of the envelope have been brought into final position with respect to each other.
In combination with an envelope forming machine for manufacturing letter envelopes, the envelope forming machine comprising means for conveying the envelopes and a lateral flap folding mechanism for folding lateral flaps of an envelope blank to form the back sides of the envelopes, the apparatus for attaching metal clasps having anchoring elements to the letter envelopes as the letter envelopes are moved in a direction of conveyance by the envelope forming machine conveying means during their manufacture and at the end of the folding operation, said apparatus comprising:
- an advancing mechanism for said clasps having a guide and separating device;
- an embossing roller to which said clasps are advanced;
- an opposing support plate,
- said embossing roller and said opposing support plate being arranged in a fixed spatial relationship to each other at the downstream end of the lateral flap folding mechanism for affixing said clasps to the lateral flaps forming the back sides of the envelopes;
- a carrier support and a fixture for securing said opposing support plate to said carrier support in an area within the lateral flap-folding mechanism of the envelope forming machine in which the lateral flaps do not yet overlap and that it extends from this area up into an area opposite the embossing roller;
- said opposing support plate, at its downstream end opposite the embossing roller, is shaped like an anvil, and
- said opposing support plate during the attaching of the clasp telescopes with the anvil into the interior space of the letter envelope formed by the front and back sides thereof.
Dependencies are inferred from the claim text.