US2380798A - Beat-up mechanism of looms for weaving - Google Patents

Description

J l 31 1945 D. w. SHIMWELL 2,380,798

BEAT-UP MECHANISM OF LOOMS FOR WEAVING Filed July 26, 194 4 2 Sheets-Sheet l \w i f T i a 35E? kzlmzzel,

y 1; 1945- D. w. SHIMWELL BEAT-UP MECHANISM OF LOOM-S FOR WEAVING Filed July 26, 1944 2 Sheets-Sheet 2 Ila/$22101 I .132, SfiZZZLZZEZZ Patented July 31, 1945 BEAT-UP MECHANISM OF LOOMS FOR WEAVING Derrick Walter Shimwell, Alderley Edge, England Application July 26, 1944, Serial No. 546,613 In Great Britain August 17, 1943 3 Claims.

This invention relates to the beat-up mechanism of looms for weaving of the type in which a beat-up comb enters the warp threads from above to effect the beat-up operation as claimed in my prior application for patent, Serial No. 522,609 filed February 16, 1944.

The object of the present invention is to provide improved means for imparting the desired movement to the beat-up comb and for stopping the loom if the shuttle is not boxed at beat-up.

The invention comprises mounting the beat-up comb between the upstanding parts of two frames, one at each side ofthe loom, the base part of each frame providing at its rearward end a journal bearing for a crank pin and being supported at its forward end by an arm movable back and forth about a fixed fulcrum to opposite sides of a vertical position and dwelling or moving slowly at its extreme positions whilst the crank pin rises and falls respectively through a relatively large angle, so ensuring that the beat-up comb has a relatively rapid upward movement to effect beatup and to leave the warp shed and then after 'a movement backwards clear of the warp shed a relatively rapid downward movement to enter the warp shed adjacent to the reed.

The invention further comprises the provision upon the base part of each frame of a catch tooth adapted to engage a catch when the frame is moving forward to the beat-up position if the shuttle is not in theshuttle box, the said catch being operatively connected to theshuttle box swell and to the loom knock-off handle, and the crank pin at the rearward end of the frame being allowed to continue its movement against spring pressure, when the frame is stopped.

Referring to the accompanying explanatory drawings:

Figure 1 is a general view of al ooffi beat-up and knock-oil mechanism arranged in one convenient form in accordance with this invention. The beat-up comb is shown on its rearward traverse about to enter. the warp shed. The knockof! mechanism is shown in the positionit occupies when the shuttle is not in the shuttle box.

Figure 2 is a view similar to Figure 1 but showing the beat-up comb in the warp shed just prior to beat-up. The knock-oi! mechanism is shown in the position it occupies when the shuttle is in the box. The beat-up comb a is bolted to a T section bar 12 extending across the loom and bolted at The rearward end of the latter has a cap e thereon for the journal bearing of the crank pin 1. One bearing brass g is in the cap and the other bearing brass h is in a block 1 which can slide against the pressure of the spring 7' in a recess k "in the base portion d of the side frame. The crank pin 1 is upon an arm m which turns with the crank shaft n. The forward end of the base portion d of each side frame is pivotally connected to an arm 0 which turns about a fixed axis at p.

The loom reed is shown at q, and the slay upon which the shuttle rides in its flight through the warp shed is shown at r. The warp threads constituting the shed are shown at s. the path of the point of the beat-up comb as it moves downwards into the shed, then forwards, and finally upwards to efl'ect beat-up and to leave the warp threads.

Each arm 0 moves during the turning of the crank shaft n from one to the other side of a vertical position and it dwells in its extreme positions as the crank arm m moves from one to 'the other side of a plane containing (1) the pivotal connection of the arm 0 to the base portion d of the side frame, (2), the axis of the crank shaft n and (3) the axis of the crank pin f. The

effect of the disposition of parts described is that when the comb a is approaching the beat=up position as shown in Figure 2, it has a relatively rapid upward movement to efiect beat-up and to leave the warp shed and when it is approaching the point of entry into the shed as shown in Figure 1, it has a relatively rapid downward movement. These rapid upward and downward movements are due to the fact that the arms 0 are relatively stationary whilst the crank arm m has a comparatively large angular movement either p d or downward.

The importance of the aforesaid rapid upward and downward movements is that the beat-up comb leaves the warp shed rapidly after beat-up and neednot re-enter the shed again until it is approaching the reed q. This enables the shuttle to be in the shed during a largepart of the loom cycle so that though such cycle may be considerably speeded up in comparison with the usual loom cycle, the shuttle speed need not be increased. The wear and tear and faults due to increase of shuttle speed render the latter uneconomical. With my construction the shuttle can enter the shed before beat-up is completed.

itsends-to two frames, one at each side of the Y The comb a and reed q may be of ordinary construction.

Each shuttle box ,has the usual swell u therein which is pressed outwards from the box when the t indicates shuttle is in the box. The swell engages one arm v of a bell crank lever, the other arm 11) of which is coupled by the link a: to a catch 1 pivoted to a block 2 held against a stop 2 by a spring 3 and capable of a limited movement up to the stop H against the pull of the spring 3 in order to push the loom starting and knock-oi! handle 1 into the loom stop" or "knock-01f position which causes, in the known manner, the loom drive to be disconnected or the power to be cut off and a brake applied; There are two blocks a and two catches y secured to a shaft journalled at WhatI claim is:

1. In a loom beat-up mechanism, mounting the beat-up comb between the upstanding parts of two frames, one-at each side of the loom, the base part of each frame providing at its rearward end a journal bearing for a crank pin and being supported at its forward end by an arm movable back and forth about a fixed fulcrum to opposite sides of a vertical position and dwelling or moving slowly at its extreme positions whilst the crank pin rises and falls respectively through a relatively large angle, so ensuring that the beat-up comb has a relatively rapid upward movement to effect beat-up and to leave the warp shed and then after a movement backwards clear of the warp shed a relatively rapid downward movement to enter the warp shed adjacent to the reed.

2. In a loom beat-up mechanism as claimed in claim 1, the'provision upon the base part of each frame of a catch tooth adapted to engage a catch when the frame is moving-forward to the beatare in the raised position as shown in Figure 1 and will be engaged by the teeth 5 (when the side frames move forward) as shown by dotted lines. The movement of the blocks 2 to operate the knock-ofl handle 4 is small. Thereafter the blocks and catches holdtheside frames with the teeth 5 thereon against movement towards the beat-up position. The crank shaft n, however, continues to turn to a limited extent before knock-off and stoppage of the loom is complete, but the movement of the crank pins 1 merely causes a movement of the bearing brasses h and blocks i against the pressure of the springs the side frames remainingstationary. when the side frame is moving backwards,-each catch tooth 5 is'lifted clear of its cooperating catch.

up position if the shuttle is not in the shuttle box, the said catch being operatively connected to the shuttle box swell and to the loom knock-oil! handle, and the crank pin at the rearward end of the frame being allowed to continue its movement against spring pressure, when the frame is stopped.

3. In a loom beat-up mechanism as claimedin claim 1, Journalling each crank pin in its side frame in a fixed bearing brass and a movable bearing brass,' the latter moving with the crank pin against spring pressure when the motion of the side frame is stopped by the knock-of! mechanism.

DERRICK WALTER. SHIMWELL.

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