EP0069708B1

EP0069708B1 - Device for checking the yarn and the knots downstream of a slubcatcher and a knotter in yarn winding machines

Info

Publication number: EP0069708B1
Application number: EP82830147A
Authority: EP
Inventors: Claudio Speranzin; Ugo Gaiotti
Original assignee: Officine Savio SpA
Current assignee: Officine Savio SpA
Priority date: 1981-06-25
Filing date: 1982-05-31
Publication date: 1986-04-09
Also published as: EP0069708A1; IT1146487B; IT8183423A0; JPH0343187B2; ATE19040T1; DE3270376D1; JPS5826771A

Abstract

The invention concerns a device (10) for checking knots and for controls downstream from the slub catcher in winding machines, said device being able to check the yarn (12) after the latter has passed through the slub catcher (37), and comprising: -means (11) for checking with blade means (13), and -means (18) for causing the opening of said blade means (13), whereby re-positioning means (39) and means (17) to regulate the opening of said blade means (13) are included.

Description

This invention concerns a device for checking the yarn and the knots downstream of a slubcatcher and a knotter in yarn winding machines.
To be more exact, the invention concerns a device which enables the quality of the knots to be checked as soon as knotting has taken place and which makes it possible to ascertain whether the yarn rising towards the yarn package during winding contains tangles, slubs, broken ends of thread or other like faults.
Some devices are known which perform the task of a slubcatcher and check the knots as soon as the latter are formed.
Various devices of this type are known and are described in DE-A-2.705.080, DE-B-2.934.544, GB-A-726,294, GB-A-596,999, CH-A-597.145 and DE-B-2.543.983.
Nevertheless these known devices are rather complicated and require complicated actuation means.
Furthermore, alongside some of such devices for better results another device may be required to carry out proper controls downstream from the slubcatcher and to be able to eliminate tangles in the yarn rising towards the yarn package, thereby improving the control already performed by the slubcatcher.
A purpose of the invention is to embody an improved single device for checking knots and for the controls downstream from the slubcatcher, whereby said device is simple in construction and reliable and provides easy operation and adjustment.
Another purpose of the invention is that the control on the yarn to be wound may also be conducted while such yarn is being transferred from the knotting position to the position of the slubcatcher, thereby substantially providing a continuous inspection of such yarn during the whole winding cycle.
So as to fulfil these purposes, the device of the invention comprises two blade means for controlling and guiding the yarn which extend lengthwise above the knotter and above the slubcatcher so as to cooperate with both of them, whereby one of such blade means is located in a pre-set and perhaps adjustable position, and whereby the other blade can be moved or rotated from its open position of rest to its closed working position.
The length of time of the conditions of rest or work can be varied by altering the reciprocal positions of reading means and two-cam means which cooperate with each other, whereby the position of such reading means can be regulated axially.
This invention is therefore embodied in a device for checking the yarn and the knots downstream of a slubcatcher and a knotter in yarn winding machines, which comprises blade means, means for opening and closing the blade means, and means for adjusting the width of a slit between such blade means (such a device being known from DE-A-2705080 or GB-A-726234), the device being characterized in that the slit comprises a first portion downstream of a knotter, which first portion checks knots formed in the yarn, and a second portion contiguous with the first portion and downstream of a slubcatcher, which second portion checks the yarn leaving the slubcatcher.
We shall give hereinafter a description of a preferred embodiment of the invention as a non- restrictive example and shall make references to the attached figures, in which:-

Fig. 1 gives a three-dimensional view of the device of the invention in its position of rest;
Fig. 2 gives a three-dimensional view of the device of Fig. 1 in its working position;
Fig. 3 shows a plan view of the two-blade means which check the yarn;
Fig. 4 gives a side view of a detail, cut away along the line C-C, of the means which regulate the opening of the two blades.

In the figures the same parts or parts performing the same functions bear the same reference numbers.
In particular, the device 10 of the invention comprises means 11 for checking the yarn 12 with blade means 13, whereby such blade means 13 consist of a fixed blade means 14 and of a blade means 15 which can be moved and be at least partially rotated, such two blade means being reciprocally positionable.
An opening or slit 16 between the two blade means 14 and 15 within which the yarn 12 is guided and slides, is obtained by regulating the reciprocal positions of the blade means 14-15 by means of suitable adjustment means 17.
In particular, such slit is dimensioned to suit the count of the yarn 12 and therefore the diameter thereof and in relation to the size of the faults and knots to be eliminated.
For this purpose it is enough to regulate the axial position of a screw 40 engaged in a threaded through hole 43 in the blade 14 and connected (44) corresponding to the stationary structure 26.
The position of such blade 14 and such stationary structure 26 are maintained temporarily by the action of a thrust spring 41, wehreby the blade 14 is hinged (42) onto the stationary structure 26 and rotates as an outcome of axial displacement of the screw 40 so as to enable the breadth of the lengthwise slit 16 to be varied, as shown in Fig. 4.
Figs. 1 and 2 show the means 18 which operate the opening of the blades 14-15 and which consist of a cam 19 shown in an exploded view and keyed to the horizontal knotting shaft 20, and of a reading pin 21 passing through an oscillating arm 22.
The axial position of the reading pin 21 can be regulated so that the pin 21 can cooperate with one of two circular crowns 23-123, which are radially superimposed one above the other and into which the cam 19, rotating in direction A (Figs. 1 and 2), is divided so as to obtain a differing length of time for the opening or closing of the blades 14-15.
In our example the circular crown 23 permits the blades 14-15 to be closed for a period limited to the knotting phase, whereas the crown zone 123 causes the blades 14-15 to be closed during the normal winding phase.
When the reading pin 21 acts on the sloping sector 24 of the radial crown 23 (Fig. 1), the oscillating arm 22, being hinged at its top 25 to the stationary structure 26, is kept in its position of rest by suitable re-positioning means 39, which consist of a piston 29 pressed by a thrust spring 27 with which such piston cooperates coaxially.
In particular, the spring 27 is kept under axial compression between the end 30 of the piston 29 pushing against the oscillating arm 22, and a resistance point 28 on the stationary structure 26.
The other end 130 of the piston 29 keeps in a retracted or non-operational position the rotating blade 15, onto which such end 130 is hinged (31).
The rotating blade 15 comprises a second pivot 32 near to the preceding pivot 31, whereby such pivot 32 enables the blade 15 to rotate around the stationary structure 26 with an arm of rotation of which the length is equal to the distance between the two pivots 31-32 located in the end 45 of the rotating blade 15.

Fig. 1 shows the position of rest of the device 10, whereas Fig. 2 shows the same device 10 in its working position.

In particular, in Fig. 2 the reading pin 21 cooperates with the sector 124 of the circular crown 123 of the double cam 19 and, to be more exact, with the front part 33 thereof 19.
In such working conditions the oscillating arm 22 is rotated in direction B and pushes against the pivot 29, thereby compressing the thrust spring 27.
In its turn the piston 29 makes the blade 15 revolve into the closed or working position by means of its end 130 hinged 31 onto the blade 15. Thus the checking of the knot just formed can be carried out in a position or zone 34 of the lengthwise slit 16 above the knotter 36.
The yarn 12 can be transferred thereafter by sliding tangentially on the fixed blade 14 up to the opposite zone 134 of the slit 16 above the slubcatcher 37, the zone 134 corresponding to the position where the yarn 12 passes during the winding phase, as shown in Fig. 3. In Fig. 3 the movable blade 15 is shown with lines of dashes when it is in its position of rest (opened) and with a continuous line when it is in its (closed) working position.
The fixed blade 14 comprises in the zone 134 a tangential porcelain guide 35, which enables the fixed blade 14 to cooperate better with the yarn 12 tangentially thereupon, and also comprises a protruding terminal stop 38, which prevents the yarn 12 from escaping the control of the blade means 13.
When the reading pin 21 acts on the radial zone 23 of the cam 19, the movable blade means 15 is returned to its retracted position as soon as such reading pin 21 enters the sector 24.
Instead, when the reading pin 21 cooperates with the circular crown 123, the rotating blade 15 stays closed against the fixed blade 14 so as to carry out therewith its controls downstream from the slubcatcher.
We have described here a preferred embodiment of the invention, but variants are possible for a technician in this field.
Thus the shapes and sizes can be changed. It is possible to envisage a different system of cooperation between the means which re-position 39 the blade, or else it is possible to foresee the use of means which are mechanically different but which are able to perform the functions described. It is possible to visualise the employment of multiple-cam means having a number of circular crowns other than two.
These and other variants are all possible for a technician in this field within the scope of the idea of the solution of the invention as set out in the appended claims.

Claims

1. Device (10) for checking the yarn and the knots downstream of a slubcatcher and a knotter in yarn winding machines, which comprises blade means (13), means for opening and closing the blade means, and means (17) for adjusting the width of a slit (16) between such blade means, the device (10) being characterized in that the slit (16) comprises a first portion (34) downstream of a knotter (36), which first portion (34) checks knots formed in the yarn (12), and a second portion (134) contiguous with the first portion (34) and downstream of a slubcatcher (37), which second portion (134) checks the yarn (12) leaving the slubcatcher (37).

2. Device (10) for checking the yarn and the knots downstream of a slubcatcher and a knotter in yarn winding machines as claimed in Claim 1, in which the means (11) for checking with blade means (13) comprise fixing blade means (14) and also corresponding blade means (15) which can be moved and be at least partially rotated, whereby such blade means (14-15) can be reciprocally positioned at least partially and are aligned above the knotter (36) and slubcatcher (37) of such winding machines, and whereby a slit (16) for the checking and sliding of the yarn is located between such temporarily closed blade means (14-15).

3. Device (10) for checking the yarn and the knots downstream of a slubcatcher and a knotter in yarn winding machines as claimed in Claim 2, in which the movable blade means (15) is hinged at two points (31-32) and is linked at one of its ends (45) to the stationary structure (26) and to reposition means (39) respectively, whereby such end hinged at two points (31-32) acts as an arm of rotation for the movable blade means (15).

4. Device (10) for checking the yarn and the knots downstream of a slubcatcher and a knotter in yarn winding machines as claimed in Claim 2 or 3, in which the fixed blade (14) comprises a protruding stop (38) which delimits the crosswise travel of the yarn (12).

5. Device (10) for checking the yarn and the knots downstream of a slubcatcher and a knotter in yarn winding machines as claimed in Claim 2, 3 or 4, in which the fixed blade (14) comprises a lengthwise guide (35) for the yarn (12) in at least part of the second portion (134).

6. Device (10) for checking the yarn and the knots downstream of a slubcatcher and a knotter in yarn winding machines as claimed in any claim hereinbefore, in which the means (18) which cause the opening of the blade means (13) comprise a cam (19) having at least one distinct circular crown (23-123) which cooperates radially with a reading pin (21) passing through an oscillating arm (22), whereby the position of such reading pin (21) can be regulated so as to cooperate or interfere with at least one of the circular crowns (23-123) of the cam (19).

7. Device (10) for checking the yarn and the knots downstream of a slubcatcher and a knotter in yarn winding machines as claimed in Claim 6, in which the re-position means (39) comprise a piston (29) which cooperates at one of its ends (30) with the oscillating arm (22), whereby its other end (130) is hinged (31) onto the movable blade (15), and whereby the piston (29) moves so as to keep the movable blade (15) in a retracted or open position, the piston (29) being thus moved owing to the action of a thrust spring (27) which is positioned coaxially with the piston (29) and is compressed axially between the end (30) and a resistance point (28) on the stationary structure (26).

8. Device (10) for checking the yarn and the knots downstream of a slubcatcher and a knotter in yarn winding machines as claimed in any claim hereinbefore, in which the means (17) which regulate the opening of the blade means (13) consist of a screw (40) engaged in a threaded through hole (43) in the fixed blade (14) and connected correspondingly (44) to the stationary structure (26), whereby the positions of the blade (14) and the stationary structure (26) are maintained temporarily owing to the action of the thrust spring (41), which is pre-arranged coaxially with the screw (40) between the blade (14) and the stationary structure (26), and whereby the blade (14) is hinged (42) onto the stationary structure (26) and rotates as an outcome of the axial displacement of the screw (40) so as to enable the breadth of the lengthwise slit (16) to be varied.