US3441058A

US3441058A - Loom crankshaft arrangement

Info

Publication number: US3441058A
Application number: US590705A
Authority: US
Inventors: Friedrich Wilhelm Bassing; Gottfried Gerhard Wilh Hofmann
Original assignee: GOTTFRIED GERHARD WILHELM HOFM
Current assignee: GOTTFRIED GERHARD WILHELM HOFM
Priority date: 1965-11-05
Filing date: 1966-10-31
Publication date: 1969-04-29
Anticipated expiration: 1986-04-29
Also published as: SE315252B; GB1118058A; BE689238A

Description

April 1969 F. w. BASSING ETAL 3,441,058

LOOM CRANKSHAFT ARRANGEMENT Filed Oct. 31, 1966 Sheet of s W'MW W "7 oat, w Jim April 29, 1969 F. w. BASSIN'G ETAL 3,441,058

LOOM CRANKSHAFT ARRANGEMENT Filed on. 51, 1966 Sheet. 2 of s Fig. 2

,7 5 MAJ April 1969 F. w. BASSING ETAL 3,441,058 v LOOM URANKSHAFT ARRANGEMENT Shoot Filed Oct. 51, 1966 Fig. 3

United States Patent 3,441,058 LOOM CRANKSHAFT ARRANGEMENT Friedrich Wilhelm Bassiug, 74 Kirschgarten, and Gottfried Gerhard Wilhelm Hofmann, 37 Am Baum, both of 205 Hamburg 80, Germany Filed Oct. 31, 1966, Ser. No. 590,705 Claims priority, application Germany, Nov. 5, 1965, B 84,392 Int. Cl. D03d 49/60 US. Cl. 139-1 Claims ABSTRACT OF THE DISCLOSURE The crankshaft of a loom is located between the harness frame and the race plate of the slay at the level of the race plate, and is directly articulated to the slay.

The invention refers to looms having a slay driven by a crankshaft with more than two cranks.

In all weaving looms of this type which are known up to now the said crankshaft is located behind the harness. This arrangement necessitates slay connecting means in the form of a linkage extending from the intermediate cranks and crank arms underneath the harness to the intermediate slay swords to drive the slay. To withstand the beat-up load, these slay connecting means have to be of relatively heavy construction and thus have the disadvantage of creating vibrations and additional load by mass acceleration, which limit the working speed of these looms.

A further substantial disadvantage of such slay connecting means is the limitation of free space for the downward motion of the harness. This refers especially to looms with an open-shed dobby, because one or several harness frames remain in bottom position during beat-up, and this means a limitation of the number of harness frames to be used.

All of these disadvantages are eliminated by the present invention by a loom with the main characteristic of having the crankshaft located between the race plate and the front harness frame thus eliminating the need for the conventional slay connecting means. Further features of the invention are a drive shaft which drives a crankshaft, and rotates at the same speed or at a multiple of its speed and which could carry the picking cams. As a further feature the centre frames can be of box type construction, housing the cranks 12a with crank arms 13 and the bottom pulleys 23 for the motion of harness 8. These centre frames have mounting surfaces 2c at their rear end for the back rest supports and further surfaces to carry the frame cross beams, and their sides are provided to take the bearings for the crankshaft, the drive shaft and the slay sword pivots.

The characteristics of this invention are illustrated in one of several possible executions by the following drawings:

FIG. 1 is a cross-section of the loom, showing a side view of one centre frame assembly,

FIG. 2 is a view of the drive side of the main frame as viewed from the outside, and

FIG. 3 is a perspective illustration of one centre frame assembly, indicating the attached cross loom components in chain-dotted lines.

The main side frames 1 (see FIG. 1) and one centre frame 2 or several centre frames 2 are connected by the cross beam 3, the front rest or breast beam 4 and the superstructure 5. The warp K is supplied from the warp beam 6, passes over the back rest 7, through the heddle eyes of the harness 8 and through the reed 9 which is mounted on the race plate 10 of the slay. The woven fabric G-passes over the front rest 4 and is taken up by cloth beam 11. According to the invention the crankshaft 12 is located between the front harness frame 8a and the race plate 10 and drives the slay by means of crank arms 13. The race plate 10 is a horizontal beam carried by the slay swords 14 mounted on swivel pivots 14a. The crankshaft 12 is driven by the drive shaft 15. This drive shaft 15 -(see FIG. 2) is driven by an electric motor over a reduction gear transmission, both not shown in the drawings. A gear 16' on drive shaft 15 drives the intermediate gear 17 which is carried by a stud shaft 18 in side frame 1. Furthermore, intermediate gear '17 drives the gear 19 on the crankshaft 12. When the drive shaft 15- and the crankshaft 12 rotate at the same speed the

gears

16 and 19 have an equal number of teeth. When, however, the drive shaft 15 rotates faster, then the gear 16 has correspondingly less teeth than the gear 19 on crankshaft 12. Finally the picking cams 20, for actuating a pick controlling motion of known principle which is not shown, may be carried by the drive shaft 15. The box type construction of a centre frame 2 is illustrated in FIG. 3, whereby the cranks 12a of the crankshaft 12 are located between the side walls 2a and 2b. Each of these walls carries a crankshaft bearing 21 from which the crankshaft ends 12b project. Furthermore FIG. 3 shows the crank link 13 which is pivoted directly at the level of the race plate 10 to the slay sword 14 with its support 14b for the race plate 10 which is located at substantially the same level as the crank shaft 12.

The rear section of the centre frame 2 carries a bearing 22 for the drive shaft 15, if the crankshaft 12 of a wide loom is driven from both ends, and the surface 20 for mounting the back rest supports which are not shown. Finally the bottom section of centre frame 2 carries the bottom pulleys 23 for the motion of the harness 8.

The side walls 2a and 2b have locating surfaces 2d and 2e, bores (2 to support the cross beams 3, and on the front side of the centre frame 2 the locating surface 2g for front rest 4 is provided. The centre frame 2 can be preassembled as indicated by solid lines. Furthermore FIG. 3 illustrates in chain dotted lines how the cross beams 3, the crankshaft 12, the drive shaft 15, the slay swords 14, the race plate 10 and the front rest 4 are mounted.

Because of elimination of the heavy slay connecting linkage means of the prior art between the crank arms and the slay, which are necessary with conventional wide looms having more than two cranks to drive the slay, the centre of gravity of the entire slay and its slay means swords has a far more favourable location resulting in the further advantage of running. uniformity.

Further, because of the eliminated heavy slay connecting linkage means the weight of driven slay parts is considerably reduced which consequently results in reduction of vibration caused by acceleration of a great mass. The connecting pivots between the crank links 13 and the slay swords 14 are arranged at a relatively large distance from slay foot pivot (14a for a very favourable and short transmission of power. This is an advantageous way of obtaining more beat-up power than with all conventional slay drives. In wide looms, the drive shaft 15, extending over the full loom width, allows to drive the crankshaft 12 from both ends, which then can be of smaller diameter than a cna-nkshaft 12 that is driven from one end only.

Furthermore, the drive shaft 15 can transmit the more power under constant load the faster it rotates compared to speed of crankshaft 12. Pick controlling earns 20, fitted to the drive shaft 15, may have lugs which have the larger a radius curvature the faster the drive shaft 15 rotates compared to the speed of crankshaft 12.

Finally, the box type construction of the centre frames 2 has the advantage of pre-assembling to provide complete units for the final assembly of looms. The embodiment disclosed in the description and shown in the attached drawings gives only one example of the invention. Structural details can vary without departing from the concept of the present invention. So it might be conceivable for instance that the loom is built without superstructure or the drive shaft 15 could be located in front of or underneath of harness frames.

We claim:

1. A loom comprising a supporting frame; harness frame means; a slay mounted in front of said h arness frame means for oscillating movement and including slay swords and a race plate between the same; a cnank shaft mounted on said supporting frame in front of said harness frame means between the same and said race plate at the level of the latter and extending parallel to said race plate, said crank shaft h aving crank arms; and links located at said level rearward of said slay and having ends pivotally connected with said crank arms and said slay swords at the level of said race plate whereby the space forwardly of said slay, rearwardly of said crank Sllflft and below said level is free, and said crank shaft is spaced a short distance from said slay for the transmission of power.

2. A loom as claimed in claim 1 wherein said slay comprises more than two slay swords and comprising a drive shaft mounted on said supporting frame rearward of said harness frames and extending parallel to said race plate and crank shaft over the entire width of the loom; and transmission means connecting both end portions of said drive shaft with both end portions of said drive shaft, respectively.

3. A loom as claimed in claim 2 comprising pick controlling cams at said end portions of said drive shaft.

4. A loom as claimed in claim 2 wherein the ratio of said transmission is selected so that said drive shaft rotates at least at the rotary speed of said crank shaft.

5. A loom as claimed in claim 2 wherein said supporting frame includes lat least one center frame housing comprising side walls through which said crank shaft and said drive shaft pass so that at least the portion of said crank shaft having said crank arms is enveloped by said housing; bearings for said crank shaft and said drive shaft in said side walls; pivot means on said side walls for supporting said slay swords for angular movement; and abutment means on said housing for supporting the breast beam and the back rest of the loom.

References Cited UNITED STATES PATENTS 1,714,112 5/1929 Stone 139l88 2,504,939 4/1950 Tuten 139-1 2,533,128 12/1950 Mallard et al. 139-1 2,835,276 5/1958 Hunt 139-1 744,843 11/1903 Widerstrom 139190 873,606 12/1907 Rhoades 139190 HENRY S. IAUDON, Primary Examiner.

U.S. C1. X.R. 139-190