US2076345A - Loom - Google Patents

Description

April 6, 1937. C. MARSDEN 2,076,345

LOOM

Filed July 25, 1935 2 sheets-sheet 1 April 6, 1937.Y c. MARSDEN 2,076,345

I Loom Filed July 25, 1955 2 Sheets-Sheet 2 Patented Apr. 6, 1937 PATENT OFFICE LOOM Charles Marsden,

Bombay Presidency,

British India Application July 25,

3 Claims.

This invention is for improvements in or relating to weaving looms and has for its object to provide improved automatic means for preventing damage to the yarn or shuttle in the event of the shuttle becoming trapped in its path from one shuttle-box to the other.

According to the present invention, a loom comprises, in combination, a spring tending to move the back rest forward to slack-en the sheet l of yarn, means normally operative to latch the back rest in its rearmost position and means interconnected with each shuttle-box swell to disengage the said latching means, the said disengaging means being normally rendered inoperative upon opening of the swell consequent on the return of the shuttle to the shuttle-box.

The loom may also comprise a brake interconnected with the back rest so as to be automatically applied to the main shaft, upon the said forward movement of the back rest.

The disengaging means aforesaid preferably comprise an arm carried on the loom sley and rotatable into and out of an operative position, a spring tending to hold it in its operative position, a bar connected with the said latching means and having a projection which lies in the path of movement of the said arm when the arm is in its operative position and a connection between the swell and the arm to move the arm into its inoperative position when the shuttle enters the shuttle-box. Other features of the invention will appear hereinafter.

A specic embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which Figure 1 is a side sectional elevation of a loom embodying the invention and Figure 2 is a front elevation showing the right hand half of the loom.

As shown in the drawings the loom comprises a power shaft I0 having a fly wheel II and crank I2. A sley I3 pivoted on t-he usual sley-swords I4 is driven from the crank I2 by a connecting rod I5. The shuttle-boxes I6 overhang the sides of the loom in the usual manner and the shuttle race is indicated by the reference Il in Figure 1.

The frame I8 of the machine carries a rearwardly extending portion I9 on which a back rest 20 for the sheet of yarn is supported. A stop 2I limits the rearward movement of the back rest and the vertical arm 22 of a double-armed lever normally locks the back rest against forward movement. Tension springs 23 are connected to the back rest and to a Iblock 24 bolted to the frame I8 so as to tend to move the back rest 55 forward.

1935, Serial No. 33,188

In Great Britain July 1, 1,935

The shorter and horizontal arm 25 of the twoarmed lever referred to above is normally retained in the position shown in Figure 1 by a dog 26 affixed to a plate 2l pivoted at 2.8 to the machine frame. A tension spring 29 connects the arm 25 to the frame I8 at 30.

The plate 2l is pivotally connected to a bar 3| running forwardly of the machine and having an upstanding toe 32 kat its front end. The parts 2|, 22, 25, 21 etc., are duplicated, there being one set on each side of the loom and a bar 3l associated with each set.

The sley I3 carries a transverse shaft 34 having two upstanding levers 35 each connected to one of the shuttle-box swells 3S, the swell being il f anchored in the usual manner at 31. The shaft 34 carries also a hook 33 engaged by a spring 39 the other end of which is anchored to one of the swords I4. The shaft also carries two arms each lying in the same vertical plane as one of the bars 3| and adapted, when in the position shown in Figure l, to collide with the appropriate toe 32 in a manner more fully described below.

The sley I6 carries the usual reed (not shown) for beating up the weft. The beating up action takes place towards the end of the forward stroke of the sley and it is essential that, should the shuttle have failed to enter the shuttle-box after passing through the shed, the sheet of yarn should be slackened off so as to prevent damage to the shuttle and the yarn. ,in the machine according to the present invention, if the shuttle enters the appropriate shuttle box i6 in the proper manner, it pushes open the swell 36 rotating the lever 35 thereby rotating the shaft 34 and thereby lifting each arm 4i] clear of the appropriate toe 32. Thus, as the sley moves forward, the beating up takes place with the yarn under tension in the usual manner. However, in the event of the shuttle becoming trapped in the shed, the swell 36 remains closed and the shaft 34 with its 'associated parts remains in the position shown in Figure 1. Consequently, towards the end of the forward stroke of the sley the arms 40 engage the toes 32 and push forward the bars 3l, The latch mechanism constituted by the plate 21 and the dog 26 at each side of the machine rotates about the pivot 28 so as to free the arm 25. The tension in the spring 23 pushes forward the back rest 2G which rotates the lever 22-25 out of itsV r way. It will be understood that the spring or springs 23 produce a very rapid forward movement of the back rest which is in fact more rapid than the forward movement of the sley at the end of its stroke. Thus, the sheet or yarn is slackened oi before damage can result from the beating up of the reed.

When the shuttle becomes trapped it is also necessary that the machine should be stopped as soon as possible. The means for stopping the machine will now be described. One of the bars 3| is provided with a forwardly extending rod 4l which normally ends just clear of a starting handle 42. However, when the bar 3l moves forward as a result of the trapping of the shuttle, it' moves the rod 4I forward and pushes off the starting handle.

In addition, a brake shoe 43 is pivoted to one arm 44 of a double-armed lever rotatable about a bearing 45 in the machine frame. The other arm 46 of the lever is formed with an arcuate slot 41 with which a pin 481 on the back rest cooperates. When the back rest moves forward to slacken the yarn, as has been described above, the lever 44-45 is rotated by the engagement of the pin 48 with the slot 4'! so that the brake shoe 43 is applied to the rim of the fly-wheel l l, whereby rotation of the shaft l is arrested.

Each bar 3| is formed with a slot 49 on its under surface to co-operate with a grooved block on which the bar slides. The bar is pulled downwardly by a tension spring 5I connected between its forward end and the machine frame. Thus, when the bar 3| is moved forward the slot 49 drops into engagement with the block 55 to prevent the bar from returning to the position as shown in Figure 1 until the machine has been reset; and also to move the dogs 32 out of the path of the arms 4B when the bar 3i has been moved forward by a sufficient distance.

The temples 52 at the front of the machine are supported on curved springs 53 which springs are engaged by hooks 54 to limit their rearward movement. It may happen that the shuttle becomes trapped in the shed opposite to one of the springs 53 and to prevent consequent damage to the temple or shuttle, the shaft 34 is provided with two additional arms 55 which, when in their lowermost position as shown in Figure l are adapted to engage dogs 56 each attached to one of the springs 53. Thus, if the shuttle becomes trapped in the shed, the arms 55 push the temple springs 53 forward when the crank passes its top centre and the possibility of damage is thus averted.

The loom described with reference to the drawings also incorporates a feature whereby the wear and tear on the shuttle and swell can be reduced and the speed of operation of the loom increased as a result. Each connecting rod i5 carries an upstanding arm 51 which co-operates with a hook-shaped member 58 attached to the appropriate shuttle-box swell. With the parts in the position shown in Figure 1 it will be seen that the members 57 and 58 are out of engagement by reason of the angle of the connecting rod I5 to the horizontal. However, as the crank l2 falls beyond the horizontal position the relative rearward movement of the arm 5l with respect to the member 58 has the eect of relieving the pressure between the swell and the shuttle just before the picker drives the shuttle through the shed.

If desired each shuttle-box may be fitted with two swells, one having a light pressure and the other a stronger pressure. The first swell, which is lightly tensioned, is so arranged as to give the full lift to the levers 40 and 55 only when the shuttle has entered the shuttle box by a suicient distance to prevent it from hitting the temple.

The second swell is placed behind the rlrst swell and is heavily sprung so as to stop the shuttle dead at the picker head. Means are provided, as above described, for automatically relieving the pressure on this swell when the shuttle is to be picked across the sley; such means reduces wear and tear on the picking band, picker, and the picking mechanism.

I claim:

1. A loom comprising a back-rest, a shuttle and shuttle-box, a swell associated with the shuttle-boX, a strong spring tending to move the back-rest forward to slacken the sheet of yarn, latching means normally operative to retain the back-rest in its rearmost position, means interconnected with the shuttle-box swell to positively disengage said latching means, and an interconnection between the swell and the said disengaging means to. render said disengaging means inoperative when the swell is opened by the return of the shuttle to the shuttle-box.

2. A loom comprising a back-rest, a shuttle and shuttle-box, a swell associated with each shuttlebox, a strong spring tending to move the backrest forward to slacken the sheet of yarn, latching means to retain the back-rest in its rearmost position, a sley carrying an arm rotatable into and out of an operative position, a bar connected with said latching means and having a projection which lies in the path of movement of said arm when said arm is in its operative position, and a connection between the swell and the arm to move the arm into its inoperative position when the shuttle enters the shuttle-box and opens the swell.

3. A loom comprising a back-rest, a shuttle, a shuttle-box, a swell associated with the shuttlebox, a strong spring tending to move the backrest forwardly to slacken the sheet of yarn, latching means operable positively to retain the backrest in its rear-most position, a sley carrying an arm rotatable into and out of an operative position, a bar carrying a projection which lies in the Path of movement of said arm when it is in its operative position, connected with said latching means and slidable forwardly of the loom to disengage the latching means, a connection between the swell and the arm to move the arm into its inoperative position when the shuttle enters the shuttle-box and opens the swell and means to retain the bar in its forward position until the loom is reset.

CHARLES MARSDEN.

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