Printing – Selective or progressive – Printing members
Patent
1994-06-23
1997-04-15
Burr, Edgar S.
Printing
Selective or progressive
Printing members
101109, B41J 160
Patent
active
056199163
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a printer, and more specifically to a printer which is to be applied to hand labellers or the like and which comprises: a display window; a plurality of setting wheels rotatably mounted about a common axis; endless printing type belts which carry in a region of their length at the outer surface printing types, in another region of their length at the outer surface indicating types which are stretched around the setting wheels and around a printing type receiver arranged with a space kept from the setting wheels and which are adjustable by turning the setting wheels; setting wheels having an actuating knob; and stop means for limiting the turning angle of the printing type belts when the printing belts have reached adjustable limit positions thereof.
BACKGROUND ART
Such a printer is described in U.S. Pat. No. 4,679,500. When using the printer, the printing types which are disposed at a predetermined printing position are inked and then brought into contact with the medium to be printed. The display or indicating types are associated in their position with the printing types on the belts in such a manner that for each printing type which happens to be disposed in the printing position a corresponding indicating type is disposed in a display position and is visible to the operator so that the operator can see which character, symbol or numeral can be printed with the printing type at that instant in the printing position. For reasons of good legibility the indicating types are generally disposed on a white background. If the setting wheels could be turned with the aid of the setting shaft to any desired extent it could easily happen that the indicating types mistakenly reach the printing position and are inked with printing ink. It would also be possible for printing ink to get onto the background of the indicating types so that the characters, symbols and numerals would then not easily be legible through the display window.
In order to solve this problem, the printer disclosed by the above-mentioned U.S. Pat. No. 4,679,500 uses a stop shoulder which is formed on printing type receivers and to be engaged with a front tooth disposed in adjusting directions of the printing belt as well as a web which is disposed at a location spaced from the stop shoulder for a distance which is smaller than the height of at least the tooth lying in front of each adjustment direction of the printing belt plus the printing belt thickness so that the front tooth is stopped between the stop shoulder and the web so as to stop the printing belt at a predetermined position even when a high torque is transmitted from the actuating knob. The actuating knob is coupled with the setting shaft under frictional forces only and slips on the setting shaft after the printing belt has reached the predetermined position at which the front tooth is brought into contact with the stop shoulder.
When the printing belt has reached the limit position at which it is not adjustable with the aid of the actuating knob by way of the setting wheel, the operator feels a load which is heavier than that felt within the adjustable region, whereby the operator recognizes that the printing belt has reached the limit position. When a desired indicating type happens to pass over the display window in practical use of such a printer, the operator often tries to set the desired indicating type in the display window by turning the actuating knob in the same direction. Such an operation brings about a result that the front tooth passes forcibly through between the stop shoulder and the web, thereby breaking the printing type belt and the web or making the printer itself unusable. Though the actuating knob slips on the setting shaft after the printing belt has reached the limit position at which the printing type belt is not adjustable for preventing the trouble described above, repetition of such a forcible operation results in breakage of the actuating knob or detachment thereof from the setting shaft, thereby makin
REFERENCES:
patent: 2598806 (1952-06-01), Lauer
patent: 4163422 (1979-08-01), Hamiseh
patent: 4679500 (1987-07-01), Volk
patent: 4843960 (1989-07-01), Ernst et al.
patent: 4951565 (1990-08-01), Volk
Burr Edgar S.
Nguyen Anthony H.
Shinsei Industries Co., Ltd.
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