US1179153A - Thread-tension device. - Google Patents

Description

e. w. BARROWS. v

THREAD TENSION DEVICE.

APPLICATION FILED MAY 21, 1914.

' 2 SHEETS-SHEET 1.

THE COLUMBIA PLANOBRAFH F0. WASHINGTON, D- C.

Patented Apr. 11, 1916.

.G. W. BARROWS.

THREAD TENSION DEVICE.

APPLICATION FILED MAYZI, 1914.

2 SHEETS-SHEET 2.

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THE COLUMBIA PLANOGRAPH co wAsmNOTON, D. c.

Patented Apn'll, 1916.

GEORGE WILLIAM BARROWS, OF NOTTINGHAM, ENGLAND.

THREAD-TENSION DEVICE.

Specification of Letters Patent. Patented A 11 191&

Application filed May 21, 1914. Serial No. 840,065.

To all whom it may concern:

Be it known that I, GEORGE WILLIAM BARROWS, a subject of the King of Great Britain, and a resident of the city of Nottingham, in the county of the said city, England, have invented new and useful Improvements in Thread-Tension Devices, of which the following is a specification.

This invention relates to improvements in single spring wire tension devices applicable to bobbins and carriages, bobbinless carriages, and similar thread carriers used in twist lace machines, and has reference to tension devices in which the free end of a spring wire, or a plate attached to such pire, is movable relatively to a nipping surace.

The present invention has for its object the production of a single spring wire tension device in which the free end of a spring,

or a plate attached to such spring, is moved over, or across, a nipping surface by the forward movement of the thread, the parts being so arranged thatthe distance between the spring, or the plate attached to such spring, and the nipping surfaces is varied by and through such movement of the spring.

In the drawings :.Figure 1 is the elevation of a thread carrier fitted with one form of the improved thread tension device. Fig. 2 is the front elevation of a device provided with a spring wire and an inclined nipping surface. Fig. 3 is an end elevation of the same. Fig. 4 is an elevation illustrating the'application of a guide or guard for the spring wire. Fig. 5 is the front elevation of a device provided with a spring wire and a flat nipping surface. Fig. 6 is'an end elevation of the same. Fig. 7 is an end elevation showing the combination of a flat nipping surface and an inclined bearing for the wire. Fig. 8 is the front elevation of a device in which the thread passes through the carrier. Fig. 9 is a sectional elevation of the same. Fig. 10 is the front elevation of a device in which the thread passes over or around the spring wire and through the carrier. Fig. 11 is a sectional elevation of the same. Fig. 12 is a front elevation to an enlarged scale of the tension device shown in Fig. 1. Fig. 13 is a sectional elevation of the same. Fig. 1a is the front elevation of a modified form of the device shown in Fig. 12. Fig. 15 is a sectional elevation ofthe same. Fig.- 16 is a front elevationof another modification of the device shown in Fig. 12, with one nipping surface removed. Fig. 17 isa sectional end elevation of the same, andFigs. 18 and 19 are diagrammatic illustrations of different shaped nlpping surfaces.

In-thread carriers of the type shownin Fig. 1, and adapted for use in levers, gothrough, and curtain lace machines there is a thln metal plate or carriage 1 which has a central hole, for receiving the threaded holder or bobbin 2. In thread carriers of the type used in plain net lace machines there is a carriage and bobbin similar to those shown in Fig. 1, but the carriages are driven by tabs or teeth on the lower edge instead of the side tabs 3 as shown in Fig. 1. The thread tension devices hereinafter described are applicable to all the above mentioned types of thread carriers, and fitted with a rotatable, or fixed thread holder.

In the arrangement shown in Figs. 2 and 3, there is a single spring wire 4 which is securely attached at its end 5 to the thread carrier 1. The free end 7 of the wire 4 normally rests upon, or is close to, an inclined nipping surface 8 which is inclined as shown relatively to the direction of movement of the thread a, indicated in this and other figures by an arrow 9. This device may be fitted with a-guide or guard 11, Fig.

4, for protecting the free end of the spring wire and preventing accidental movement of the same.

In the arrangement shown in Figs. 5 and 6, there is a flat nipping surface 12 and the wire 13 is so fixed at its end 14 that it tends to move in the direction of the line 15, Fig. 6, relatively to thenipping surface,or, as shown in Fig. 7 there is a flat nipping surface 12 and an inclined rest or guide 17 by which the distance between the free end of the wire and the nipping surface 12 is varied as the end of the wire is moved across such nipping surface.

In the arrangement shownin Figs. 8 and 9 the wire 18 and nipping surface 19are the same as the corresponding parts shown in Figs. 2 and 3. In addition there is a hole 20.through the nipping surface 19 so thatv 22 in such surface, and a thread a which passes over or around the tension wire 23. In this arrangement the tension upon the thread is partly due to the bending of the thread around the wire and partly to the pressure of the wire upon the thread.

In the device shown in Figs. 12 and 13, the spring wire 24: is provided with an end plate 25 which works between two fixed nipping surfaces 26 and 27. In the arrangement shown the surface 26 forms part of a bar which extends across the back of the carriage 1, Fig. 1, while the surface 27 is at the free end of a bar attached to the front of the carriage. This arrangement is adapted to facilitate the threading up of the tension device but the fixed nipping surfaces may be carried in any other convenient manner. The edges of the plate 25 are grooved to act as guides to the thread and hold it on the plate, and the thread a is preferably wrapped around the plate.

In the modification shown in Figs. 14: and 15, the fixed nipping surface is a wedge shaped finger 26 which is attached to any convenient part of the carriage. Working in conjunction with the finger 26 there is a grooved plate 27* carried by the spring wire 28 and shaped to press upon the whole or part of the sides of the finger 26*. In this arrangement the thread a passes upward and over the finger 26 and then under one edge of the plate 27 so that the pull of the thread tends to lift the plate 27 off the finger 26.

In the arrangement shown in Figs. 16 and 17 the spring wire 29 is provided with an upper wedge or plate 30 and a lower wedge or plate 31, and these plates work in conjunction with two fixed nipping surfaces 32 and 33. In the arrangement shown one side of each of the wedges 30 and 31 is vertical and these faces work in conjunction with vertical faces on the plates 32 and 33. Inclined faces are also formed on the plates 32 and 33 to correspond with the inclined faces of the wedges 30 and 31, and the thread a is passed between the inclined faces of the wedges and the plates.

In all arrangements herein shown and described the spring wire, or the plate attached thereto, may work in connection with straight inclines as shown in Fig. 18, or with curved or cam shaped inclines of the kind shown in Fig. 19, and when the latter type is used the incline may be shaped to give a difiering variation in the tension for equal distances moved by the spring over the nipping surface.

In the various tension devices herein described the wire spring may be of any suitable section and may be fastened to the thread carrier by clips, riveting, soldering, or other similar means, and the end of the wire may act upon the thread, or it may be flattened or be otherwise shaped, or be provided with a roller, or with a plate as shown in some of the devices. The thread may pass between the spring or plate and the nipping surface, or it may make one or more half turns around the wire or plate, and when wrapped around the wire or plate the relative movements of the thread and parts of the tension device prevent, or tend to prevent, the accumulation of flufi' upon the parts and thereby prevents, .or tends to prevent, the fluff from influencing the tension ing effects of the device.

In all the arrangements herein described the movement of the thread tends to move the spring wire, or the plate attached thereto, over the nipping surface and to such a position that the pressure of the spring, or the plate, upon the thread is reduced. The thread is suitably guided to and from the tension device and all the edges of such de vices are shaped to prevent fraying or cutting of the thread. The spring wire may be straight or it may be bent to suit the thread carrier to which it is applied, and in all cases the extreme thickness of any device does not exceed the greatest thickness of the thread carrier.

I claim 1. The combination of a lace machine carriage, a thread holder mounted therein, the carriage being provided with a thread guide and with a thread tension nipping surface rising from the carriage across which the thread passes in moving from the holder to the said thread guide, and a spring tension device secured at one end to the carriage, its opposite end being free and adapted to bear upon the thread and hold it against the said nipping surface, the thread-engaging portion of the spring tension device being movable by the forward movement of the thread in a path to vary its distance from the said nipping surface as it is moved.

2. The combination of a lace machine carriage, a thread holder mounted therein, the carriage being provided with a thread guide and a thread tension nipping surface rising from the carriage and across which the thread passes as it moves from the thread holder to the thread guide, and a spring tension device secured at one end to-the carriage and carrying at its other, free, end, an expanded piece bearing upon the thread and holding it against the thread nipping surface, the said free end of the spring tension'device being movable acrossv the nipping surface by the forward movement of the thread in a direction to vary its distance from the said surface as it is moved.

3. The combination of a lace machine carriage, a thread holder in such carriage, a fixed inclined nipping surface, a spring wire tension finger the free end of which is adapted to be moved by the forward movement of the thread across the fixed nipping surface substantially as herein described.

4. The combination of a lace machine carriage, a thread holder in such carriage, a fixed nipping surface inclined to the face of the carriage, and a spring tension finger adapted to be moved by the forward movement of the thread in a plane which is parallel to the face of the carriage substantially as herein described.

5. The combination of a lace machine carriage, a thread holder in such carriage, double inclined nipping surfaces, a spring tension finger adapted when in one position to press the thread into contact with one or both of such nipping surfaces and to be moved by the forward movement of the thread away from such nipping surfaces substantially as herein described.

6. The combination of a lace machine carriage, a thread holder in such carriage, a nipping surface inclined in one direction relatively to the face of the carriage, a nipping surface inclined in the opposite direction relatively to the same face of the carriage, a spring wire, and a wedge shaped plate on the free end of such finger substantially as herein described.

GEORGE WILLIAM BARROWS.

Witnesses:

WILLIAM H. POTTER, SAMUEL STEVENSON.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner or ratents, Washington, D. 0."

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