Reading arrangement for a dobby
AssigneeStaeubli Ltd.
InventorWalter Kleiner
Life of this patent
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Abstract
A dobby with a mechanical reading device for a control card having perforated and nonperforated portions therein according to a pattern. The reading needle of the reading device of the pattern card has yielding elements for the purpose of reducing the impact force of the reading needle onto the pattern card.
Claims12
In a reading arrangement for a fast-running dobby having a pattern card with perforated and nonperforated portions thereon and further having a mechanical reading device which includes a reading needle for reading said nonperforated and perforated portions of said pattern card, drive means for effecting a driving of said reading needle toward and away from said pattern card, said reading needle having a free end portion adapted to be received in said perforations, the improvement comprising wherein for the purpose of reducing the impact energy of said reading needle on said nonperforated portion of said pattern card, yieldable impact energy absorbing means is provided on said reading needle between said free end portion and the remainder of said reading needle, said yieldable impact energy absorbing means yielding in direction of the applied force of said reading needle to said pattern card to effectively reduce the overall length of said reading needle when engagement of the free end thereof with said nonperforated portion of said pattern card occurs by an amount which is equal to the length of movement of said remainder of said reading needle toward said pattern card following the engagement of said free end with said nonperforated portion so that said impact energy applied by said remainder of said reading needle to said nonperforated portion of said pattern card is absorbed to thereby enhance the life expectancy of said pattern card.
In a reading arrangement for a fast-running dobby having a pattern card with perforated and nonperforated portions thereon and further having a mechanical reading device which includes a reading needle for reading said nonperforated and perforated portions of said pattern card, the improvement comprising wherein for the purpose of reducing the impact energy of the reading needle on the pattern card, yielding means is provided which yields in direction of the applied force of said reading needle to said pattern card so that said force applied by said reading needle to said pattern card is absorbed to thereby enhance the life expectancy of said pattern card, and wherein said reading needle consists of two separate parts and wherein said yielding means is a friction connection between the ends of said separate parts of said reading needle, said friction connection yielding in an axial direction of said reading needle, one of the ends of one of said separate parts of said reading needle being movable into engagement with a portion of the other of said separate parts to limit the amount of relative movement therebetween.
Dependencies are inferred from the claim text.