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On The Fly Print Wheel Employing Wide Face Hammer

IP.com Disclosure Number: IPCOM000080142D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 4 page(s) / 60K

Publishing Venue

IBM

Related People

Meier, JH: AUTHOR [+2]

Abstract

Print wheel or disc 1, c.f. Fig. 1, is mounted on a carriage, not shown, of an on-the-fly printer, not shown. Wheel 1 rotates about axis 2. Face or side 3, c.f. Fig. 4, faces the recording medium, not shown. Side 3 carries the type or font characters, e.g., the twenty-six letters of the English alphabet, partially shown, in their normal sequence, i.e., A to 2. The twenty-six letter type characters are provided with equal angular spacings as over a sector 360 degrees-E of wheel 1.

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On The Fly Print Wheel Employing Wide Face Hammer

Print wheel or disc 1, c.f. Fig. 1, is mounted on a carriage, not shown, of an on-the-fly printer, not shown. Wheel 1 rotates about axis 2. Face or side 3, c.f. Fig. 4, faces the recording medium, not shown. Side 3 carries the type or font characters, e.g., the twenty-six letters of the English alphabet, partially shown, in their normal sequence, i.e., A to 2. The twenty-six letter type characters are provided with equal angular spacings as over a sector 360 degrees-E of wheel 1.

The print wheel 1 is continuously rotated at a uniform angular speed in a predetermined direction, e.g., direction 4, at the same time it is being continuously moved in a linear direction, e.g., direction 5, at a uniform linear speed across the recording medium during the line print mode of the print cycle. After a line print mode is completed, the carriage and hence, print wheel 1 is moved in the direction opposite to arrow 5 and the apparatus is ready for the line print mode of the next cycle. In on-the-fly printers, because the characters are printed out without stopping either the rotational movement of the print wheel or the linear movement of the carriage and wheel, the rate of printing is greatly enhanced over types of printers where there is such stoppage.

Wheel 1 prints out the type characters in an upright orientation at the twelve o'clock print orientation of the wheel. For this purpose, the field of each character is inclined with respect to the radial axis passing through its center at different angles, so that when the particular character is aligned with a print position it will print out with the upright orientation. Thus, the field of the first character A is inclined with respect to the radial axis ra passing through its center at an angle alpha max. The angle alpha max is judiciously selected such that when the character A is aligned with the print position associated with the recording medium and indicated by the vertical dash-dot line 6, the character A is in its desired upright orientation, c.f. Fig. 1. It should be noted that when this occurs, center 2 of wheel 1 is at a distance 7a to the left of print position 6.

In a similar manner, the field of each of the successive characters B to M is inclined at a progressively relatively smaller angle with respect to the radial axis passing through its center, so that the particular character will be printed in its desired upright orientation when it becomes aligned with print position 6.

Center 2 of wheel 1 in Fig. 2 has moved to the distance 7m to the left of line 6 and wheel 1 has rotated through an angle, whereby the character M is in alignment with the print position 6. The field of character M is inclined at an appropriate angle alpha min with respect to the radial axis rm passing through its center, so that the character M is in an upright orientation when it is aligned with position 6.

When center 2 of wheel 1 moves past the line 6 a...