Typewriting machines – Including type-set-assemblage mounted on carrier and... – Type-head – per se
Patent
1982-12-06
1984-09-25
Burr, Edgar S.
Typewriting machines
Including type-set-assemblage mounted on carrier and...
Type-head, per se
292257, B41J 100
Patent
active
044733127
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a fastening mechanism for removably fastening together two workpieces. The invention has particular application to a fastening mechanism for releasably securing a print head to a reciprocating carriage in a printer.
Dot matrix printers are becoming increasingly more important and useful in the field of high-speed document printing. Printers of this kind are extremely advantageous for use with data processing systems wherein it is required to provide a printout of the data generated at very high speeds.
In a wide variety of high-speed printers, a print head carriage carrying the dot matrix print head is slidably mounted on a support shaft and is movable in a bi-directional linear path back and forth along a printing line, the printing being performed by selectively operating a plurality of print wires or ink jets to produce a matrix of dots on a record medium to form alphanumeric characters thereon.
In a known matrix printer arrangement, as disclosed for example in U.S. Pat. No. 3,750,792, the print head unit is secured to the base of the carriage by a number of screws. However, this manner of securing the print head to the carriage has the disadvantage of rendering the removal of the print head for replacement or maintenance work time-consuming and rather difficult because of poor accessability and crowded space conditions around the matrix print head. For example, the screws may inadvertently be dropped into the printer housing while they are being removed or inserted, and they then must be found and retrieved from possibly even more inaccessible places in the printer. Also, the need to use a screwdriver to remove or tighten the screws may give rise to the risk of damaging intricate mechanical or electronic parts or components of the printer if the screwdriver is incorrectly or carelessly used.
SUMMARY OF THE INVENTION
There is provided, according to the present invention, a fastening mechanism for removably securing together first and second workpieces, including a stud member which is mounted on the first workpiece for rotational and axial movement relative thereto and which is arranged to pass through an aperture in the second workpiece, spring means associated with the stud member, and first and second cooperating means respectively provided on the stud member and the second workpiece whereby, with the stud member passing through the aperture and upon rotating the stud member from a first position to a second position, axial movement of the stud member is brought about against the action of the spring means and the first and second workpieces are latched together.
In the described embodiment, the fastening mechanism removably secures the housing of a wire matrix print head to a printer carriage. A support block on the carriage (first workpiece) carries a locking member that includes a stud member and abutment surfaces on the stud member. A mounting plate on the print head housing (second workpiece) is secured to the carriage by rotating the stud member so that its abutment surfaces engage corresponding cam surfaces and indentations on the print head housing.
It is, therefore, an object of the present invention to provide an improved fastening mechanism.
It is another object of the present invention to provide a fastening mechanism for removably fastening together two workpieces which enables the workpieces to be separated and connected together in a simple and rapid manner without the use of any tools.
It is a further object of the present invention to provide a fastening mechanism to permit a print head housing to be readily fastened to and removed from a printer carriage.
These and other objects will become more apparent from the following description when taken in conjunction with the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a fragmentary top view of a matrix print head housing secured to a carriage of a printer by a fastening mechanism according to the invention.
FIG. 2 is a fragmentary elevational view, part
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patent: 3123389 (1964-03-01), Biesecker
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patent: 4381896 (1983-05-01), Shiurila
Burr Edgar S.
Clark Robert L.
Hirabayashi M. J.
Jewett Stephen F.
NCR Corporation
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