US2622625A - Method and means for cleaning nose boards on axminster looms - Google Patents

Fig. 8 is a side elevation looking in the direction of

arrow

8, Fig. 2, indicating the manner in which the exhaust end of the air passage is closed to cause lateral escape of compressed air through the slots of the nose board, and

Referring more particularly to Figs. 1 and 6, the loom frame 1 supports a bottom shaft 2 which in the present instance rotates once every third beat of the loom. The

lay

3 is mounted on a

shaft

4 which is rocked in usual manner by power derived from shaft 2 and transmitted through one or

more rods

5.

Front and back tuft cutting knife mechanisms 6 and 1 are ordinarily in their spaced relation shown in Fig. 1 but move together to cut the tuft after it has been formed at the fell of the cloth or fabric F. The bottom shaft 2 also supplies power for moving the knives, Figs. 1 and 6 indicating the knife mechanism 6 mounted on a

rocking shaft

8 to which is connected a depending

arm

9 attached to one or more rods [0 leading rearwardly for operation by power derived from shaft 2. The loom operates with the usual tube frames one of which, shown at l2, has a bar l3 to the front edge of which are attached yarn tubes I l through which extend yarns Y wound on a spool S.

A type of three shot fabric which may be woven on the loom is shown in Fig. '7 and comprises stuffer warps 23 and binder warps 2| and 22. The stuffer warps divide the fabric into two planes with respect to the cross shots, these shots being double and arranged as shown in Fig. 7 so that every alternate top shot I has a tuft T held by it while the intermediate top shots II are held between the binders 2| and 22. The third bottom shot III for each tuft is below the stuifers and is held by the binders 2 I. Harnes

frames

25, 23 and 21 may operate in usual manner on the binder and stuffer warps to form a warp shed designated generally at W in which the shots of filling are inserted by a needle N.

A stationary support forming part of the loom frame has secured thereto a

nose board

3| the rear part of which is provided with a plurality of

teeth

32 separated transversely of the I loom by slots 33' to receive the

reed dents

34 of a reed designated generally at R. The reed has a forward motion after each filling shot inserting operation of the needle N. Extending into the

slots

33 are

plates

35 of a comb designated at C mounted on a

structure

36 rocking about a

pivot

31 under action of a

rod

38.

In the operation of the matter thus far described the comb C is normally in forward position, or to the left as viewed in Fig. 1, and the reed R will be in rear position when the needle N lays the first of three filling shots, such for instance as a shot II. After the needle has been retracted the reed will move forwardly to move this shot II up over hooks 43 on the

teeth

32 to a position forward of the hooks. On the next beat-up of the reed a filling shot III may be moved to a position rearward of the hooks 48 without being pushed over the latter and the reed will then move rearwardly. The

tube frame

12 will then be dipped and the tuft yarns will be inserted between the binder warps and a third filling shot I will be laid by the needle N.

The

rod

38 will then rock the

structure

38 in a clockwise direction around pivot 3'! to move the

comb plates

35 to the dotted line position, Fig. 5. These plates are in register with the reed dents and move rearwardly through the lower parts of

slots

33 and between the depending tuft yarns until their rear edges are close to the reed dents. The reed and the comb C then move forwardly for a full stroke to move both of the picks III and I over the nose board to a position in front of the hooks The tube frame is then lifted to pull off yarn for the next operation and the cutting knife mechanisms come into action to sever the tufts from the tube frame.

In carrying the preferred form of the invention into effect each of the

teeth

32 is provided with an upwardly opening

cross slot

50. The

slots

50 are closed on their bottoms and aligned to define a

channel

5| extending across the loom.

As shown more particularly in Fig. 4 each

cross slot

50 is defined by a substantially vertical

rear edge

52, a

bottom

53, and a front

vertical edge

54. The lower part of the latter edge is defined by part of its tooth while the upper part is formed by the solid untoothed part of the nose board.

Extending forwardly, or to the left as viewed in Fig. 4, from the bottom of

nose

40 of each

tooth

32 is a supporting edge or surface which aligns more or less with the

top surface

56 of the nose board on which the fabric F is supported. Each of the teeth of the nose board is provided with one of the

slots

50 as already described, and a convenient way to make the nose board is first to cut

channel

5| and then cut the

teeth

32.

Secured to the left side of the nose board as viewed in Fig. 3 is a

plate

60 held in position on the nose board by screws BI and having secured thereto a

hollow fitting

62 which aligns with the adjacent or

air inlet end

63 of

channel

5|. The

plate

60 has a

top surface

64 which is preferably flush with the

top surface

56 of the cloth board.

The

fitting

62 is connected to a

pipe

65 leading to a source of compressed air (not shown) and has therein a self-

closing valve

66 operated by a

cam

61 on the three-pick shaft 2. The valve is opened by a

tappet

68 on the cam at a given time in the three-pick cycle of the loom as will be described more fully hereinafter.

The right end of the nose board as viewed in Fig. 3 has secured thereto another

plate

10 similar to

plate

60 but having a slot 1| therein for a slide valve or air control means 12 connected by

rod

13 to the front knife cutter mechanism 6. The slide valve is normally in forward position to leave

theexhaust end

14 of

channel

5| open, but is adapted to be moved rearwardly by

rod

13 across the channel to close its exhaust end when the cutter mechanism 6 rocks to the right, Fig. 1. It is to be understood that mechanism 6 is shown only as a convenient way for operating the slide valve and any other part of the loom operating in correct time relation with the lay can be used.

As shown more particularly in Fig. 4 the fabric F extends over the upwardly opening

channel

5| and with the latter defines an air passage K communicating with

slots

33 and through which air is forced from fitting 62 to the opposite or exhaust end of the passage. Whenever air is thus forced through the channel any lint or other dirt. designated at L in Fig. 4, which may have fallen into the channel or pushed into the latter by the reed dents and

plates

35 will be blown out of the passage provided the

slide gate

12 is open.

In the operation of the preferred form of the invention the

slide gate

12 will be forward or in open position, and

valve

66 will be opened by

tappet

68 to introduce air into the passage K when the lay is on front center position and the reed dents are in the

slots

33. The reed dents do not completely fill these slots but effectively prevent lateral escape of any substantial amount of air from passage K in a rearward direction. This opening of

valve

66 will ordinarily occur on the beatof the loom in which the tube frame is lifted, and immediately after the lifting operation is completed the cutter mechanisms come into action to sever the tufts, and in doing so

rod

13 will move the sliding

gate

12 rearwardly to close the exhaust end of the air passage K. In order that the reed dents may not interfere with the cuttingoperation the lay will swing rearwardlyfrom the position shown in Fig. 4, thereby opening the

slots

33 at about the time the exhaust end of the passage K is closed. The

tappet

68 will hold the

valve

66 open long enough to continue the introduction of air into the passage K after the

gate

12 is in closed position and the air thus introduced will escape laterally through the

slots

33 to clean them of lint, etc.

It will thus be seen that the first step in clearing lint from the nose board is to introduce a stream of air into passage K while

slots

33 are closed and the exhaust end of the passage is open. The reed dents then move out of their

slots

33 and the

gate

12 moves to close the exhaust end of the passage to force compressed air laterally through the

slots

33. The

tappet

68 will then pass from control of the valve ,66 and the latter will close until the next operation is called for.

In the preferred form of the invention it will be noted that the fabric F forms the top part of the passage K and that any lint or dirt released from that part of the fabric over the channel due either to the cutting operation or movement of the fabric by the reed will fall into the slot. During the tuft forming beat-up the last row of tufts to be formed will preferably be supported on the edge or

surface

55 and will not be pushed forwardly to a position over the channel. In

this way the rearmost row of tufts is correctly supported and there is no likelihood that any of the rows of tufts can move downwardly into the channel. Fig. 4 shows the reed in its extreme forward position with its leading or beat-up edges rearward of the

edges

52 of the

slots

50.

In the modified form of the invention the nose board has a plate till-secured thereto at BI and extending rearwardly to the

hooks

40, as shown for instance in prior Patent No. 2,293,561. The rear edge of plate 80.is provided with

short slots

82 aligned with the

slots

33 to receive the reed dents when the latter move to their extreme forward position.

Plate

80 extends over the channel 5i and when used will form the upper side of an air passage Kl similar to passage K. The

plate

80 is used as an attachment when it is desired to make a cheaper fabric with lower pile tufts. The

plate

80 is not necessary in order to carry out the purposes of the present invention, but when used for the purpose specified will form part of air passage Kl. In the modified form the

gate

12 will operate as in the preferred form.

When air is introduced into the air passages of either the preferred or the modified form of the invention the comb C will be forward, or in the full line position shown in Fig. 5 and its plates will preferably be below the

bottom edges

53 of the slots so as not to interfere with the stream of air. These

plates

35 will close the lower forward-part of the

slots

33 and thus cooperate with the reed dents to prevent any substantial lateral escape of air during the first step in the cleaning operation.

From the foregoing it will be seen that the invention sets forth a nose board similar to the usual nose board except for the

channel

5| formed by

theslots

50 in the series of teeth extending across the loom. In both forms of the invention the method of cleaning the nose board is the same, that is, a stream of air is directed through the air passage while its exhaust end is open as a first step in the operation while the reed dents and

plates

35 are in the

slots

33, and then the

gate

12 is closed and compressed air escapes laterally through the

slots

33 after the reed dents have moved rearwardly. Obviously, all dust, lint etc., which is discharged through the exhaust end of the channel will not need to be forced through the relatively

narrow slots

33. In the preferred form of the invention the cloth forms the top of the air passage, whereas in the modified form adapted more for the weaving of a cheaper fab-- ric, the plate forms the top of the air passage- In both forms of the invention the nose board. has a transverse channel formed by aligned slotscut in the teeth of the nose board. Also, it ispreferred in both forms of the inventionto have: the

short surface

55 of each tooth extend for-- wardly from the

hook

40. This extension may notbe necessary when the

plate

80 is used, but if the: latter is removed to permit the weaving of a high-- er grade of fabric with higher tufts it will them be desirable to have the supporting

edge

55 to prevent the rearmost row of tufts from falling into the

channel

5|. The

gate

12 has been shown herein as operated by part of the tuft cutting mechanism, but it will be suflicient if the gate is operated by any other part of the loom incorrect time, that is, after

valve

66 has been open sumciently long to blow dust and lint out-of the exhaust end of the channel, after which the gate will be closed to effect lateral escape of the compressed air to clean the

slots

33.

6. The Axminster loom set forth in

claim

5 wherein the teeth extend forwardly from said hooks to said channel to support the row of tufts nearest to said hooks at a point behind said channel.

7. The Axminster loom set forth in

claim

5 wherein each tooth has a fabric supporting. edge extending forwardly from the associated hook to said channel.