IL44306A

IL44306A - Thread supply device for textile machines

Info

Publication number: IL44306A
Application number: IL44306A
Authority: IL
Original assignee: Iro Ab
Priority date: 1973-03-12
Filing date: 1974-02-27
Publication date: 1977-04-29
Also published as: JPS49124361A; FR2221370A1; US3908921A; ES423876A1; SE7403288L; HU172380B; DK138313B; AU6632674A; IL44306A0; NL7403246A; PL88819B1; CH570328A5; FR2221370B1; DK138313C; JPS5455641A; CA1094790A; RO71172A; BR7401824D0; JPS5733262B2; GB1442571A

Description

»DO3O ηΐ3ΐ >δ>^ οιπ ηρορκν |ρηπ Thread supply device for textile machines Aktiebolaget IRO.

C. 42486 A Thread Supply Device for Textile Machines This invention relates to a thread supply device for textile machines, in particular knitting machines, comprising a thread drum upon which there is tangentially wound the thread issuing from a storage bobbin, in order to form an intermediate supply and from which drum the thread may be withdrawn vertically over a withdrawal rim of the drum and through a central withdrawal eye and further comprising a movable thread guide element disposed adjacent the withdrawal path of the thread near the withdrawal rim, said element not being in contact with the unwinding thread in a first position and laterally engaging the unv/inding thread in a second position and preventing it from being, laterally displaced relative to the direction of rotation of said thread drum such that the speed at which the thread is withdrawn is limited to the speed at which the thread is wound onto said drum when the thread guide element is in said second position.

Such a thread supply device which may selectively be used for positive or intermittent thread supply, is already known.

In an embodiment of this known thread supply device, the thread guide element is designed as a finger which is pivotally jour-naled beneath the lower front end of said thread drum about a pin which extends transversely to the stationary thread drum axis. In the position for positive thread supply, the finger is pivoted into a position in which it projects a bit beyond the withdrawal rim and in which it is located transversely to the thread drum axis. This embodiment of the known thread supply device functions absolutely perfectly. It necessitates, however, a stationary axis which passes through the drum.which,, of course, is accompanied by certain constructional limitations. In addition, in the case of intermittent thread siipply, the finger which is located in alignment with the thread drum axis is difficult to get at because the unwinding thread passes about it. Hence, a switch-over to positive thread supply during continuous operation is not entirely without difficulty. In another embodiment of the known thread supply device, the withdrawal eye also oerves as a thread guide element. It is journaled on a pivotal arm to this end which is pivotally journaled on the framework of the thread supply device outside of the thread drum about an axis which extends transversely to the thread drum axis such that the thread eye can selectively be brought into alignment with the thread drum axis or into another position in which it lies radial to the thread drum. This embodiment also functions absolutely satisfactorily, but suffers from the drawback that in the case of positive thread suppl the withdrawal eye is located laterally of the thread drum, thereby changing the path of the unwinding thread. In order to prevent this, a stationary auxiliary withdrawal eye must be provided in practice.

The object of this invention is to simplify the construction and manipulation of a thread supply device of the type cited at the outset.

This object is accomplished in accordance with the invention in that the thread guide element is designed as a hook in the case of a thread drum which is set in rotation, the mouth of said hook being open in the direction of rotation of said thread drum and that the hook is mounted on a stationary support arm extending outside the thread drum from the axis thereof toward and beyond the withdrawal rim.

In the inventive thread supply device, a switch-over from positive to intermittent supply and vice-versa- can be made by simply pivoting or sliding the hook which is easily accessible at all times due to its location outside the area through which the unwinding thread passes. When switching-over to positive thread supply, the unwinding thread is reliably caught in the mouth of the hook which opens in the direction of drum rotation. The withdrawal eye remains at the same location in both operational positions of the thread supply device. The inventive thread supply device is thus simple in design and easy to operate. i - The support arm is advantageously extended beyond the hook and supports at its free end the withdrawal eye as well as a thread monitoring device if desired. In this case, the support arm also accomplishes additional functions which contributes further to the structural simplificati. on of the device.

In another embodiment of the thread supply device, the hook is advantageousl mounted on the winding means when the thread drum is stationary and the thread is wound upon the drum by means of a winding means passing. around one edge of the drum.

The hook, which passes around the drum together with the winding means, does not make contact with the unwinding thread in its first position so that intermittent thread supply is possible. In its second position, it limits the withdrawal of the thread from the drum to the speed of rotation of said unwinding means, thereby limiting the winding speed at the same time as well. This means that positive thread supply is ensured. This switch-over is possible in the easiest and. simplest manner because the hook merely needs to be displaced. The hook catches the thread in the open mouth automatically in the second position so that a reliable switch-over to positive thread supply is possible. .

A thread supply device is already known which comprises a stationary thread drum and an annular winding means which passes about the free drum rim and includes a thread eye for guiding the winding thread, a further eye being provided in the annular winding element for guiding the unwinding thread during position thread supply. It is necessary, however, to thread the thread into the withdrawal eye of the winding element when switching over from intermittent to positive thread supply which, of course, is bothersome and awkward.

Embodiments of the invention are illustrated in the drawing in which:- Figure 1 is a schematic side elevation of an inventive thread supply device in the position for positive thread supply, Figure 2 is the thread supply device according to Figure 1 during intermittent thread supply, Figure 3 is a side elevation in partial section illustrating another embodiment of an inventive thread supply device, Figure 4 is an elevation of the thread supply device according to Figure 3 from below during positive thread supply and Figure 5 is an elevation corresponding to Figure 4 during intermittent thread supply.

In the drawings, 1 is a thread drum which is rotatably journaled in a housing 2. The housing 2 is secured to a textile machine, in particular a knitting machine, by means which are not shown in the drawing, a plurality of supply device corresponding to the number of knitting systems being provided in the knitting machines. The drum 1 is driven via a pin wheel 3 and a perforated belt (not shown) which cooperates with the pin wheel and which is driven synchronously with the textile machine. The thread F issues from a supply bobbin (not shown), passes through a preliminary braking means 4, a disc brake 5 and a thread monitoring device 6 to be wound tangentially upon the thread drum 1 which rotates in the direction indicated by the arrow P. The thread drum 1 is associated v/ith an inclined displacement disc 7 which displaces the thread windings which are formed in axial direction along the thread drum so that an intermediate thread supply V is formed on the drum. The thread; is unwound from the intermediate supply V through a braking ring 8 in vertical direction and over a lower withdrawal rim 1a of the thread drum. Coaxial to the axis of the thread drum 1 , a two-part withdrawal eye 9 is provided with an engaging thread monitoring device 1o for guiding the unwinding thread F' to the textile machine.

The withdrawal eye 9 and the thread monitoring device 1o are mounted at the free end of a support arm 11 which extends Outside the thread drum 1 parallel to the axis thereof and which is mounted in the housing 2 at its other end.

Directly "below the withdrawal rim, there is journaled on the. support arm 11 by means of a hub 12 a hook 13 which can selectively be brought into the positions evident from Figures 1 and 2 by rotating the hub 12 about the support arm 11. In Order to secure the hook in these positions, a ball notch means 14 may be provided.

In the position according to Figure 1, the hook. 3 engages the area of the unwinding thread F'-. The hook mouth is open in the direction of rotation of the thread drum 1. The unwindin thread F' , which attempts to pass ove the withdrawal rim 1a contrary to the direction of rotation of the thread drum 1 due to the. tension acting on the thread in the direction of withdrawal, is thus caught, up in the open hook mouth and is prevented by the hook 13 from additionally moving laterally about the withdrawal rim 1a. Hence, only that amount of thread can be unwound which is released by the drum due to its rotation in ■ direction F. This limits the speed of thread withdrawal to the .. speed of thread winding. This is the normal mode of operation f the creel bobbin which is primarily intended for positive thread supply.

If thread should have to be pulled out of the intermediate supply V when the textile machine is in-operative or moved manu-. ally fo purposes of adjustment or repair, the hook 13 is pivoted Into the position according to Figure 2 in which it is positioned Outside the path of withdrawal of the thread F*. Thread, can then be arbitrarily removed from the thread drum 1 in a downward direction. I particular, the speed of withdrawal is no longer dependent on the winding speed. In this position, the inventive thread supply device may also be employed for intermittent thread supply during continuous operation.

Instead of pivotally journaling the hook 13 on the support' arm 11, a displaceable mounting which could be moved transversely to. the axis of the thread drum is also feasible.

In Figures 3 to 5, 21 indicates a thread drum which is secured to a housing 22 so as to prevent rotation. The housing 22 is secured to a support ring of a. textile machine by means of a clamping device schematically indicated at 24. The drum 21 and the housing 22 are traversed by a hollow shaft 23 to which a pin wheel 25 is keyed on. The pin wheel 25 operates together with a perforated drive belt (not shown) to set the hollow shaft.23 in rotation. At the lower free end. of the hollow shaft 23, there is a disc 26. mounted to prevent rotation which bears at its outer edge a flange-like ¾¾n%-¾ surrounding the lower free edge of the thread' drum 21. The ring 27 contains a thread eye 28. Parts 26 to 28 form a rotating winding element for the thread Έ issuing from a supply bobbin (not shown) which passes through the hollow shaft 23, is then deflected outwardly in a radial direction, is conducted through, the thread eye .28 and is wound tangentially upon the thread drum 21. A ball bearing 29 is journaled on the hub 26a of the disc 26 in an inclined position and has a displacement disc 3o which rotates thereabout. This displacement disc 3ohas arms 31 which extend outwardly through longitudinal slots 32. in the jacket of the thread drum 21. The arms 31 are interconnected externally by a ring 33.

Due to the inclined arrangement of the displacement disc 9 on the disc 5, the displacement disc executes a wobbling movement during rotation of the hollow shaft and the winding element secured thereto to prevent rotation, thereby pushing the thread windings on the thread drum 1 upwardly in axial direction of the thread drum so that an intermediate thread supply V is formed on the drum.

The thread is removed from the thread drum 21 in a vertical direction from this intermediate thread supply V as is. indicated at I" in the drawing. In so doing, the thread passes over the

Claims

outer surface of the ring 27 into a central withdrawal eye 34.

1. A hook 36 is journaled on the underside of the disc 26 so as to be pivotal about 'a vertical axis 35. The hook lies within the circumference of the disc 26 when in a first position as shown in Figure 5 and the mouth of the hook projects beyond the circumference of the disc 26 radially when in a second position as illustrated in Figure 4. · In the position according to Figure 5, the hook 36 does not make contact with the unwinding thread F' so that the thread can be unwound from the thread drum 21 vertically independently of the winding speed. Intermittent thread supply is thus possible in this manner. If the hook is located in the position according to Figure ft the unwinding thread F' cannot pass about the lower rim of the drum 21 more quickly than the ring 27. The thread F' is caught in the mouth 36a of the hook 36 and thus cannot "outrun" the hook 36. Since the rotational speed of the ring 27 and of the eye 28 determines the winding speed of the thread, the unwinding speed is thus limited to the winding speed. Hence, positive thread supply is ensured. WHAT IS CLAIMED IS:- 1. A thread supply device for textile machines, in particular knitting machines, comprising a thread drum upon which there is tangentially wound the thread issuing from a storage bobbin in order to form an intermediate supply and from which drum the thread may be unwound vertically over a withdrawal rim of the drum and through a central withdrawal eye and further comprising a movable thread guide element disposed adjacent the withdrawal path of the thread near the withdrawal rim, said element not being in contact with the unwinding thread in a first position and laterally engaging the unwinding thread in a second position and preventing it from being laterally displaced relative to the direction of rotation of said thread drum such that the speed at which the thread is unwound is limited to the speed at which the thread is wound onto said drum when the thread guide element is in said second position, characterized in that the thread guide element is designed as a hook (13) in the case of a thread drum which is set in rotation, the mouth of said hook opening in the direction of rotation of said thread drum (1) and that the hook is mounted on a stationary support arm (11) extending outside the thread drum from the axis thereof toward and "beyond the withdrawal rim (1a).

2. A thread supply device according to claim 1, wherein the support arm (11) is elongated "beyond the hook (13) and bears at its free end the withdrawal eye (9) and a thread monitoring device (1O) if desired.

3. A thread supply device according to claim 1, wherein the hook (13) is secured to a hub (12) which is journaled on the support arm (11) so as to be rotatable thereabouts.

4. A thread supply device according to at least one of claims 1 to 3, wherein the hook (36) is journaled on the winding ele-r-ment in the case of a stationary thread drum (21) when the thread (F) is wound onto the drum by means of a winding element (26 to 28) which passes about the rim of the drum.

5. A thread suppl device according to claim 4, wherein the hook (36) is pivotally journaled. on the. underside of the ring in angular spaced relation from the thread eye such that it lies within the circumference of the ring in the first position (Figure 3) and projects radially beyond the circumference of the ring with the hook mouth (36a) in the second position (Figure 2) when a winding element is used in the form of a ring (26, 27) having an axial thread eye (28) which conducts the thread (F) through a hollow shaft (23) passing through the thread drum (21).