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Acoustic Filters for Impact Printers

IP.com Disclosure Number: IPCOM000051284D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 76K

Publishing Venue

IBM

Related People

Rupe, DE: AUTHOR [+3]

Abstract

Whenever an impact printer, such as a wire matrix printer, is used, a considerable amount of noise is generated due to the constant impaction of the printing elements against the paper. Furthermore, whenever such printers are used with continuous form paper, additional noise is generated by the movement of the paper over a long path through the printer mechanisms.

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Acoustic Filters for Impact Printers

Whenever an impact printer, such as a wire matrix printer, is used, a considerable amount of noise is generated due to the constant impaction of the printing elements against the paper. Furthermore, whenever such printers are used with continuous form paper, additional noise is generated by the movement of the paper over a long path through the printer mechanisms.

Fig. 1 shows a vertical cutaway of a printer having a document insertion device of a known type, and Fig. 2 shows a similar vertical cutaway of a printer having a continuous form feed mechanism of a known type. Referring to Fig. 1 specifically, an acoustic filter is mounted over the platen and between the document insertion device and the exit path for the paper. The filter consists of an acoustic foam material within a package having perforated front and lower surfaces and molded plastic top and back surfaces.

Referring to Fig. 2 a similar acoustic filtering arrangement is shown for a continuous form feed mechanism attached to a printer. In this case two filters having acoustic foam within a package are utilized, one on both sides of the paper on its entry path through the printing mechanism. The inner filter also serves to reduce the noise generated by the printhead. As shown, the two filters also serve to facilitate the loading of the continuous form.

Since the primary acoustic energy for printing is in the high frequency ranges, the low-pass acoustic filters desc...