Textiles: weaving – Warp manipulation – Shedding
Patent
1992-01-10
1993-10-05
Falik, Andrew M.
Textiles: weaving
Warp manipulation
Shedding
D03C 906
Patent
active
052496058
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a heddle frame with detachable edge connections between the side supports and the frame staves consisting of hollow profiles, where at each edge joint a projection extending laterally from the side support engages peg-like into a hollow space in the frame stave and is clamped down by means of a screw.
2. Description of the Related Art
Heddle frames, which are oscillatingly moved in a weaving machine, are as generally known subject to a very high loading due to the continuous reversals of stress. The stress levels increase with the continuously improved weaving machines operating at increased rotational speeds, such that ruptures caused by the high loading occur at the side supports, and specifically below the peg-like projection. For weight reasons, heddle frames are nowadays made preferably of light metal, which type of material has, however, the property that the flexural strength of this material, drawn as curve, decreases steeply over a number of load changes to a certain load change value and then less steeply, but continuously. However, this is not the case with steel after having reached a certain limit value. Thus, in view of the above mentioned continuously decreasing flexural strength curve of light metal the rupture of parts made from such material can happen at any time due to the higher loading.
SUMMARY OF THE INVENTION
Thus, the present invention has as an object to prevent ruptures of heddle frame material by structural measures. In order to meet this object the heddle frame includes side supports having projections that are received in hollow spaces in frame staves with which the side supports are connected, the projections and the side supports being spaced by vibration damper elements.
By a vibration damper element in each edge connection between a side support and the frame stave of the heddle frame the vibrations caused by the frequent load changes are counteracted and the load peaks are no longer transmitted directly from one part to the other part.
BRIEF DESCRIPTION OF THE DRAWINGS
Various embodiments of the invention will be explained hereinbelow based on the drawings. There are illustrated in:
FIG. 1 and FIG. 2 show side views of two different embodiments of a side support with projection designed broken off;
FIG. 3 shows the side support according to FIG. 2 viewed from the left side as shown in FIG. 2;
FIG. 4 shows the edge connection of a heddle frame, consisting of the side support in a further embodiment with the frame stave only partially shown;
FIG. 5 and FIG. 6 show edge connections with modified embodiments of the side support and a non-planar vibration damper element;
FIG. 7 and FIG. 8 are top views of two different forms of the side support with projection.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
At the one narrow side of the side support 1 of which only the upper end portion is illustrated in FIG. 1, a projection 2 is mounted which serves for connecting the side support 1 to a frame stave (not shown), which connection is termed an edge connection. One form of edge connection is illustrated in FIG. 4. The projection 2 serving as part of the connection includes in the FIG. 1 embodiment a planar base part 2a extending in the direction of the longitudinal axis of the side support 1. The purpose of base part 2a is to increase the area over which projection 2 abuts the vibration damper element 3. Damper element 3 is connected in a preferred manner by bonding to the side support 1 and to the projection 2 along mutually adjacent surfaces. The larger this vibration damper element is, the better is the effect to be obtained therewith. Because the vibrations caused by the high revolution operation of the machine are dampened it is possible to avoid in this way ruptures of the side support 1, which have occurred predominantly at the level of the lower edge of the projection 2. Preferably, an elastomer such as rubber or a rubber like material is used as vibration damper element 3. Polyurethane ca
REFERENCES:
patent: 3895655 (1975-07-01), Sujdak et al.
patent: 4390045 (1983-06-01), Baumann
patent: 4741367 (1988-05-01), Kitawaki
patent: 4907810 (1990-03-01), Whiteford
Falik Andrew M.
Grob & Co. Aktiengesellschaft
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