Printing – Selective or progressive – Bed and platen machines
Patent
1984-02-17
1986-04-01
Pearson, Charles A.
Printing
Selective or progressive
Bed and platen machines
101 9335, 101 9348, 4001571, B41J 904
Patent
active
045790566
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates generally to printing or typing equipment involving the use of a pressure process to transfer dry film impressions onto an image carrying tape. Specifically, this invention is directed to the impact printing mechanism which transfers the image.
CROSS REFERENCE
This application hereby incorporates by reference the disclosures of our co-pending applications filed on even date herewith with the following titles:
BACKGROUND OF THE INVENTION
In the field of commercial art, there is a significant need for the simple means of transferring prefabricated letters or characters to a "paste-up" sheet for later photographing and printing. A dry rub-on transfer letter process is well known. However, these materials are supplied in sheets and must be carefully aligned to produce acceptable images. Machines were later developed which prepared such letters on a continuous tape which solved many of the alignment problems. An example of such machine is shown in PCT Publication WO82/03600 and in U.S. Pat. No. 3,912,064, as well as U.S. Pat. No. 4,243,333.
Since the transfer of characters may be used in enlargement and high resolution printing, the imprint must be extremely accurate. As the transfer media is often a carbon film impressed onto a paper tape having low adhesion, high force must be applied to make a proper impression and a striking position of the hammer and anvil in the printing mechanism must be extremely well aligned. In addition, all of this activity must take place in a very short time period if the machine is to be capable of high speed printing.
The present invention overcomes the problems noted above inherent in the prior art while providing a mechanism capable of rapid generation of characters with an extremely high degree of quality and consistency.
SUMMARY OF THE INVENTION
The invention is generally directed to an impact printing apparatus to transfer an impression of a character from a print disk onto an image carrying tape with a color carrying film, including a press having first and second members relatively closeable toward each other to apply pressure when the print disk, tape and film are positioned therein, the first member being fixed in position and having a first planar surface and the second member having a second planar surface opposite the first surface and being movable substantially along a path orthogonal to the first surface. The apparatus also includes a drive member having two ends propelling the second planar surface toward the first surface, the drive member slideably engaging the second member at one end and having a pivot between its ends, and lever means for moving the other end of the drive member to rotate on the pivot causing one end to move in a direction opposite of the movement and thereby drive the planar surfaces together, the pivot being eccentric and rotatable about an axis, the rotation thereof having the effect of moving the location of the pivot thereby changing the rotational movement of the lever means.
According to another aspect of the invention, the second member includes a hammer having upper and lower surfaces, the upper surface having the planar surface and wherein the drive member is mounted on a rotatable eccentric shaft. According to a further aspect of the invention, the lower portion of the hammer is narrower than the upper portion and when the drive member includes a pair of space members with a slot there between which receives the narrower portion of the hammer and is aligned to engage the upper portion of the hammer when the drive member is actuated.
According to a further aspect of the invention, the lower portion of the hammer includes a guide member which allows for alignment of the location of the planar surface thereon.
Various advantages and features of novelty which characterize the invention are pointed at with particularity in the claims annexed hereto and forming a part hereof. However, for a better understanding of the invention, its advantages and objects obtained by its use, reference sho
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IBM Technical Disclosure Bulletin, vol. 15, No. 3, Aug. 1972, p. 916 "Magnetically Restorable Free Flight Hammer" by Engel et al.
McGourty Lawrence F.
McGourty Thomas K.
Pearson Charles A.
Varitronic Systems, Inc.
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