US2399881A

US2399881A - Weft inserting device

Info

Publication number: US2399881A
Application number: US490621A
Authority: US
Inventors: Moessinger Albert
Original assignee: Sulzer AG
Current assignee: Sulzer AG
Priority date: 1942-08-26
Filing date: 1943-06-12
Publication date: 1946-05-07
Anticipated expiration: 1963-05-07

Description

. May 7, I946. Mo ssm R 2,399,881

WEFT INSERTING DEVICE Filed June 12, 194:

INVENTOR: ALBERT MOESSINGER BY MA ATTO NEY.

' Patented May 7, 1946 WEFT INSERTING DEVICE Albert Moessinger, Winterthur, Switzerland, assignor to Sulzer Freres, Societe Anonyme,

Winterthur, Switzerland Application June 12, 1943, Serial No. 490,621

- In Switzerland August 26, 1942 Claims. (01. 139-193),

It is known to make use of grid-like structures to guide moving parts, particularly weft inserting devices for looms. Such a moving part is usually provided with a point so that it can easily enter the next guiding element, thus diminishing the force of the knocks against the grid.

The extent of knocking, however, depends on several factors, such as the shape of the point, the clearance between the part and its guide, and particularly on the pitch, i. e. the distance between the guiding elements. The greater this pitch, the greater will be the force of the knocks. It is therefore customary to make the pitch comparatively small, since otherwise the running qualities of the part would be much impaired. The present invention provides the means of using guiding elements with a comparatively large pitch while still retaining quite good running qualities for the moving part. Itconsists in that slightly inclined surfaces are provided at the two ends of the moving part, these surfaces being longer than the pitch of the grid-like guide. They may be inclined in such a way that they are substantially parallel to the guides when the moving part lies obliquely in the guiding means.

The slightly inclined surfaces may formwith the axis of the moving part an angle whose tangent is equal to the clearance between the moving part and its guides divided by the length of the mov-- ing part between the two inclined surfaces. It will be found preferable to provide all sides of part of the shuttle 9 is preferably pointed, so that any warp thread which may be present in the guiding duct of the shuttle will not be broken. The slightly inclined surfaces I0 form with the axis of the shuttle an angle or whose most suitable value can easily be determined. This angle depends on the amount of clearance s between the shuttle and the guiding, as well as on the length of the shuttle, where tan a is the clearance 8 divided by the length l of the moving part between the two inclined surfaces In.

In Fig. 2 a modified design of a shuttle according to the invention is shown. The cylindrical part of the shuttle 9 marked l in Fig. 1 is replaced by a rounded surface l3, which may be for instance spherical or elliptic. In this case the smallest play of shuttle H in its guiding is s=w-a.'. To determine the inclination of the surfaces III, the clearance w-a must be considered, where a is the thicknessof the shuttle at the beginning of the inclined surfaces l0.

Through this invention the knocks and friction on a moving part guided in a grid-like structure will be reduced to a minimum, and this is particularly important for parts which have to keep moving under their own inertia. Reduction of the knocks is particularly important when the moving part is a shuttle moving into the shed the moving part which'are guided in the grid with surfaces slightly inclined towards the ends of the part.

In the drawing;

Fig. 1 is an example of a shuttle according to the invention.

Fig. 2 shows a modified design of a shuttle according to the invention.

In order to eliminate the drawbacks connected with shuttles of conventional configuration, it has been customary to increase the number of guiding elements supporting the shuttle, thereby reducing the pitch of the guiding elements, and to lengthen the shuttle. Such means are particularly disadvantageous in the case of a loom, because they increase friction of the warp threads on the guiding elements and the weight of the shuttle.

In Fig. l a shuttle 9 is shown on which, in accordance withthe invention, slightly inclined surfaces III are provided at both ends. These surfaces ill have a length l, which is greater than I the pitch t of the guiding elements I. The front through a, grid-like guide, since in that case the guiding surface of the guiding elements is hit,

and sharp edges can thus be produced which may damage the warp threads.

I claim:

' 1. The combination of a shuttle and a plurality of widely spaced guide means disposed at two substantially opposite sides of said shuttle and being spaced therefrom and forming a path for said shuttle, said shuttle riding exclusively on said uide means and having surfaces at both of its ends inclined with respect to the longitudinal axis of said shuttle and converging toward the ends thereof, the inclination of said surfaces at different ends and sides of said shuttle being such that'they are substantially parallel to the path formed bysaid guide means and substantially adjacent to said guide means when the shuttle is in inclined position with respect to said path.

2. The combination of a shuttle and a plurality of widely spaced guide means disposed at substantially opposite sides of said shuttle and being spaced therefrom and forming a-path for said shuttle, said shuttle riding directly on said guide means and having surfaces at both of its ends inclined with respect to its longitudinal axis and converging toward the ends of the shuttle and being longer than the distance between two of said spaced guide means, the inclination of said surfaces at difl'erent ends and sides of said shuttle being such that they are parallel to the path formed by said guide means and sub stantially adjacent to said guide means when the shuttle is in inclined position with respect to said path.

3. The combination of a shuttle and a plurality of widely spaced guide means disposed at substantially opposite sides of said shuttle and being spaced therefrom and forming a path for said shuttle, said shuttle riding exclusively on said guide means and having a longitudinal center portion and surfaces extending from both ends of said center portion and being inclined with respect to the longitudinal axis of said shuttle and converging toward the ends thereof, the inclination being such that the tangent of the angle formed by one surface with the axis of the shuttle is substantially equal to the proportion of the clearance between the thickest the length or said center portion.

4. The combination of a shuttle and a plurality of widely spaced guide means disposed at substantially opposite sides of said shuttle and being spaced therefrom and forming a path for said shuttle, said shuttle riding exclusively on said guide means and having a longitudinal center portion and surfaces extending from both ends of said center portion and being inclined with respect to the longitudinal axis of said shuttle and converging toward the ends thereof, the inclination being such that the tangent of the angle formed by one surface with the axis of the shuttle is substantially equal to the proportion of the clearance between the thickest portion of the shuttle and said guide means to the length of said center portion, and said inclined surfaces, individually, being longer than the distance between two of said spaced guide means.

5. The combination set forth in claim 3 in which said center portion is of convexly curved barrel shaped configuration interconnecting the inclined surfaces.

portion of the shuttle and said guide means to-" ALBERT MOESSINGER.