US2231526A

US2231526A - Mechanism for

Info

Publication number: US2231526A
Authority: US
Publication date: 1941-02-11
Anticipated expiration: 1958-02-11

Description

Feb. 11, 1941. CASABLANCAS 2,231,526

MECHANISM FOR DRAWING TEXTILE ROVINGS Filed March 7, 1959 2 Sheets-Sheet l 1941. F. CASABLANCAS MECHANISM FOR DRAWING TEXTILE ROVINGS Filed March 7, 1939 2 Sheets-Sheet 2 Patented Feb. 11, 1941 UNITED STATES MECHANISM FOR. DRAWING TEXTILE ROVINGS Fernando Casablancas, Manchester, England, as-

signor of one-half to Casablancas High Draft Company British company Application March 7,

Limited, Manchester, England, a,

1939, Serial No. 260,399

In Great Britain March 31, 1938 5 Claims.

This invention relates to mechanisms for drawing textile rovings of the type making use of one or a pair of endless belts engaging and guiding the roving being drawn. Drawing mechanisms of this type usually comprise a pair of rollers each carrying an endless belt between which belts the roving is adapted to pass, and a pair of front drawing rollers for drawing the roving from between the said belts. Tensor members located near the nip of the front rollers pass through the loops of the belts to guide the same and cause them to bear on the roving with a suitable pressure. In order to obtain satisfactory operation of the mechanism, it is sometimes necessary for the belts, and particularly the parts of them which engage the roving, to be taut and in order to ensure this while allowing for stretch of the belts, adjustable or resilient means have been provided bearing against each belt or against one of the belts where it passes from, the tensor member to its roller, i. e., against that section of the belt which is remote from the roving. This tensioning means is, however, of necessity somewhat cumbersome, and it is accordingly the chief object of this invention to provide improved and simple self -tensioning means for ensuring that the operative sections of the belts engaging the roving are taut.

In accordance with the present invention, in a mechanism for drawing textile rovings of the type specified, at least one belt is provided with a belt self-tensioning arrangement comprising a member located between the belt-supporting roller and tensor member and frictionally engaging the belt after it has passed over the roller but before it reaches the tensor member, the said belt being adapted to form a slack loop extending away from the roving and between the roller and the friction member. The friction member exerts a braking action on the belt and the effect of this is that the section of the belt between the friction member and the tensor member is kept under tension and remains taut.

The friction member may consist of a transverse rod or roller and may engage the belt on one or both faces thereof. The belts are made substantially longer than normal, the extra length being caused to form the slack loop extending away from the roving between the belt rollers and the friction members as aforesaid, in order to ensure that the loop remains in the desired position and to assist in the threading of the belts, a transverse bar or other device may be provided within the loop.

In order that the said invention may be clearly understood and readily carried into effect the same will now be more fully described by way of example with reference to the accompanying drawings wherein like references denote like parts and in which all the figures are diagrammatic elevations, partly in section, each figure illustrating an alternative embodiment of the invention.

Referring now to the drawings and in particular to Figure 1 thereof, an endless belt I is carried by one of a pair of rollers 2 and cooperates with a plate 3 to engage and guide the roving being drawn. Front drawing rollers 4 are arranged to draw the roving from between the belt I and plate 3 and a tensor member 5 is arranged within the belt I and near the nip of the drawing rollers 4. A friction member comprising a transverse bar or rod 6, which may be made in one piece with the tensor member 5, engages the inner surface of the belt near to the path of the roving and also near to the roller 2 carrying the belt. The belt I, which is made substantially longer than usual, bends up between the roller 2 and the friction member 6 in the form of a loop I and a second transverse bar or rod 8 may be provided within this loop. During normal operation, however, the natural resiliency of the belt causes the loop I to' remain in position without necessarily even touching the bar 8.

In accordance with the modification illustrated in Figure 2, the belt I carried by one of a pair of rollers 2a and 2b is provided with a friction member in the form of a roller 9 which roller may be freely rotatable, may be rotatable under the control of a friction brake mechanism, may be fixed or may be positively driven at a peripheral speed which is less than that of the belt I. In this embodiment one or more further rollers'lil and one or more transverse members I I cooperate with the belt I for engaging and guiding the roving.

Thus the belt of a single belt mechanism or one or both the belts of a double mechanism may be provided with a friction member in the form of a roller 9 (as shown in Figure 2) against which the belt presses either by reason of its natural resiliency or under the action of another roller, for example III (Figure 2) which may be on either side of the roving and may thus bear on the belt directly or with the interposition of the roving.

The embodiment illustrated in Figure 3 is similar to that illustrated in Figure l with the exception that a further endless belt I2 of the normal type and a second tensor member 5a are provided to cooperate with the belt I and the transverse bar 8 is omitted.

As illustrated in Figure 4 a mechanism having a pair of belts I6, II as in Figure 3 is provided with a pair of additional rollers I3, I4 one within "belts I, 20 are provided with belt self-tensioning on under its own weight.

upper belt I6 is thus actually provided by the lower belt II, the two belts being in contact and travelling at the same speed from the additional rollers l3, l4 to the tensor members and 5a.. In this embodiment the additional roller 13 is of such a diameter that it is engaged on both sides by its belt I1, i. e. it is engaged on one side by the part of the belt ll travelling from the roller 2b to the tensor 5a while it is engaged on the other side by the part of the belt I! returning to the roller 21) r from the tensor So. It may here be pointed out that the roller [4 could, if desired, be designed in a similar manner to the roller l3 the effect being, more particularly in the case of the upper belt,

1 to increase the pressure exerted by the additional roller on the belt. The friction member is denoted by the numeral 6a.

An exactly similar arrangement to that just described may be used in the case of a single belt mechanism, the upper belt preferably being omitted. In this case the remaining bottom belt is braked by means of the lower additional roller, theroving beng pressed by means of the upper additional roller against the belt and thus ensuring sufficient friction between the latter and the lower roller. The upper roller is preferably freely rotatable but may be braked if desired.

According to the embodiment shown in Figure 5 the upper belt is omitted and the roving is pressed against the belt I by means of the roller l5.

The embodiment illustrated in Figure 6 is similar to that illustrated in Figure 1 with the exception that the arrangement is reversed in that the endless belt 19 is carried by the lower or driving roller of the pair of rollers 2 and the cooperating plate 3 isarranged above the belt and bears there- If desired the additional pressure of a spring may be added to the plate 3. Also the second transverse bar or rod 8 is omitted although this omission is optional.

Figure 7 shows an embodiment wherein both arrangements each including a friction member comprising a transverse bar or rod 6b and 60 engaging the inner surface of its appertaining belt near to the path of the roving and also near to guide or tensor member, means co-operating with said belt to engage and guide the roving being drawn between the belt and the said means, a transverse member located within said endless belt between the said roller and the tensor or guide member, the said transverse member frictionally engaging with the belt to cause it to form and maintain a slack loop between the friction member and the said roller and extending away from the roving, which loop serves to create a self tensioning effect on the belt, and means for drawing the roving from between said belt and the said co-operating means.

2. In a mechanism for drawing textile rovings, the combination of a pair of belt carrying rollers, two endless belts, one passing around each of said rollers and around a guide or tensor member, a transverse member located within at least one of said belts between said rollers and the guide or tensor members, said transverse member frictionally engaging with the belt in which it is located to cause it to form and maintain a slack loop between the friction member and the said roller and extending away from the roving, which loop serves to create a self-tensioning effect on the belt, and means for drawing the roving from between said belts.

3. In a mechanism for drawing textile rovings, the combination of a belt carrying roller, an endless beltpassing around said roller and around a guide or tensor member, means co-operating with said belt to engage and guide the roving being drawn between the belt and said means, a transverse member integral with said guide or tensor member, said transverse member frictionally engaging with the belt to cause it to form and maintain a slack loop between the friction member and the said belt carrying roller and extending away from the roving, which loop serves to create a selftensioning efiect on the belt, and means for drawing the roving from between said belt and the said co-operating means.

4. In a mechanism for drawing textile rovings, the combination of a pair of belt carrying rollers, two endless belts, one passing around each of said rollers and around a guide or tensor member, a transverse member located within one of said belts between the belt carrying roller and the guide or tensor member thereof, said transverse member frictionally engaging with the belt in which it is located, said transverse member forming a loop in said belt extending away from the rovings and between the last mentioned roller and transverse member, a pair of additional rollers, one within each belt and bearing on those sections of the belts which are between the belt carrying rollers and the guide or tensor members and which control the rovings, and means for drawing the rovings from between said belts.

5. A mechanism for drawing textile rovings as in claim 1, in which means are provided for ensuring the initial formation of the loop when the mechanism is mounted or assembled.

FERNANDO CASABLANCAS.