US1627604A - Spring-winding machine - Google Patents

Description

\ 1,627,604 May l0 1927' J. A.- HITTLE SPRING WINDING MACHINE Ma 1o `1927. 1,627,604

y J. A. HITTLE SPRING WINDING MACHINE Filed Jan. 7. 1926 I5 Sheets-Sheet 2 MH? ZW 1,627,604 May .10 1927 J. A. HITTLE SPRING WINDING UAGHIINE Filed Jan. 7. 1926 3 Sheets-Sneet3 Janus AYHWY @1f- WWW Patented May 10, 1927.

' UNITED -STATES im ARTHUR HITTLI, Ol' 4ASBIG'IQB. T0

` wm 0l INDIANAPOLIS, INDIANA.

PATENT- OFFICE.

SPRING-mm1? HACHH'I.l

M invention relates to windin machines whic in the modification to be ereinafter described, are particularly adapted for windingl helical coils of heavy material in the manufacture of springs. The machine to be particularly described is simple in construction, speed and accurate in operation and can be ten ed by comparatively unskilled labor. These points will be obvious fromthe following descri tion, read in conjunction with the annexe drawings, in which Fig. 1 is a side elevation of the working end of my improved machine,

Fig. 2 1s an enlarged view of the winding head showing the inltial winding stage,

Fig. 3 is a view similar` to Fig. 2 showing the coil fully wound,

Fig. 4 is a vertical longitudinal section of Figs. 5, 6 and 7 are sections on the respective lines designated in Fig. 1,

Fig. 8 is a face view of an element,

Fig. 9 is a side view of same, while Figs. 10 and 11 illustrate preliminary steps in the production of a coil in accordance with my invention.

The supporting frame 10 for my improved mechanism is of any suitable form. I have illustrated a vertical pedestal supporting a hollow longitudinal section which in turn has a vertical face 11 to which the winding head is securely attached, as by bolts 12, Figs. 1 to 3. In order to supply driving power to the winding head I show a reciprocable rack 13, driven in any suitable manner, and it will be seen that the supporting frame and reciprocable element may be easily adapted from a standard broaching machine, as I have indeed done in actual practice.

As shown in Fig. 4, rack 13 has a screw spindle 14 at its rear end supported in two smooth- bored stanchions 15 and 15 fixed to an inner wall of the frame. Intermediate these stanchions, and prevented thereby from axial movement, is a worm wheel 16 having a threaded bore engaging the threads of spindle 14. Journaled transversely in the frame beneath the worm wheel 16 is a shaft 17, one end of which projects from the frame and has rigidly secured thereto a pulley 18 which is driven from any suitable reversible source of power. Mounted on shaft 17 between two clutch collars 19 and 19 is a worm wheel 20 engaging worm wheel 16. The collar 19 is secured to the shaft as by a set screw 21, while collar 19 is splined on the vshaft and is movable into and out of lclutching position by means of a fork 22 enga ing in a peripheral groove thereof.- The `for 22 is connected by an arm 22,`extend mg through the frame, to an operating lever 23, and is normally held in retracted position b a tension spring 24. It is thus evident t at by rotating the pulle 18 in either dlrection and manipulatin t e lever, 23, rack 13 ma be reci rocate The win ling hea structure having -a rear wall 24 adapted to be secured to the face I11 of the frame as by bolts 12. Both the rear wall 24 and front wall 25 have apertures alined with the aperture in face 11 through which thev rack 13 passes. For safety pur ses a sleeve 26 is screwed in the front wal aperture, the sleeve being sufficiently long to-prevent the projection of rack 13 therefrom at its farthest outer position. rIfhe rack is of rectangular cross-section and to preventits turning about its longitudinal axis and to support its outer end, a V-shaped bearing block 27 is fixed in the relation shown in Figs. 4 and 6. t r

Journaled in side walls 28 and 29 of the winding head is a shaft 30 to which is fixed a spur gear 31 meshing with rack 13, and a larger spur gear 32 meshing with a spur gear 33 fixed on shaft 34 also journaled in side walls 28 and 29. Gears 31 and 32 may be conveniently made integral with a common sleeve 31.

Integral with shaft 34 and positioned on theloutside of wall 28 is a circular faceplate 35 having at its center a winding mandrel or arbor in the form of a helical boss 36. If the spring is to be made of Hat strip metal, for instance, the mandrel stands from the face plate to an extent substantially equal to the width of the strip, while the radial distance between the initial and terminal points 37 and 38 of the helical curve is somewhat greater than the thickness of the strip. A transverse radial notch 39, somewhat wider than the thickness of the strip intervenes between points 37 and 38.

A vertical extension member is set into side wall 28 at the outer edge of the latter and held in place by means of screws 41, Figs. 1 to 3, 6 and v7. A slide 42 attached, through lon itudinal slots 43, 43 to the extension mem er 4by mea-ns of cap screws 44,

consistis of a box-like noma' In.l 4

44. Fixed to the upper end of slide 42 .by means of screws 45 is a horizontal arm. 46 extending over mandrel 36, this arm havmg suicient clearance with face plate 35 to permit its free movement in front of the latter.

A link 47 is pivoted to the lower end of slide 42 and to a foot lever 48, which latter is pivotally supported as at 49. The end' 50 of said lever projecting beyond point 49 is provided with suitable weights 51 to hold slide 42 normally in its upper position.

In operation, one extreme end of the strip to be coiled is rst given a s uare bend, as in Fig. 10, the portion' w being no longer than notch 39 is deep. To aid in starting the o eration, I prefer to give the strip a: furt er curved bend as in Fig. 11. The portion m is now inserted in notch 39, as in Fig. 1, whereupon, by applying foot pressure, or some constant mechanical pressure, to the end 52 of lever 48, arm 46 is brought to bear on the strip. The power now being applied to pulley 18 and the clutch thrown in, the mandrel is rotated in the direction of the arrow Fi 1 until the 'position is reached as shown 1n Fig. 2. The operation is now halted for a moment and arm 46 raised while a flexible spacing element, such as a leather strap, is placed on the metal strip with its end against shoulder 38 of the mandrel, Figs. 2 and 8. The thickness of these two superposed elements is substantially equivalent to the radial distance between point 37 and point 38. It is to be understood that the spaclng element need only be used where a clearance is desired between the convolutions of the coil and the thickness of the strap and dependent radial distance between points 37 and 38 determine this clearance.

Arm 46 is now lowered aga'in and the rotation of the mandrel resumed until the end of thestrip is reached, Fi 3. It will be noted that arm 46 is provide with a shoulder 46 for guiding the strip as it is fed.

Upon releasmg lever 48, the coil may now be slipped from the mandrel in,an ax1al direction, and by reversing the power, rack 13 is returned to initial position. It will be noted that to speed up the whole operation I have interposed a multiplyin gearing between the rack and the mandr.

While I have described one embodiment of my invention with some particularity, it is to be understood that I intend my invention tobe construed from the following claims:

I claim: 1. In a machine of the type described, as

-winding mandrel comprising a boss adapted for rotation about the transverse axis, means on said boss for engaging a strip to be wound, means for rotating said boss, a member adapted to exert pressure on said strip transversel to the axis of said boss, means for norma ly holding said member in operative position, and means for bringing said member into pressure exerting relation to said strip.

2. In a machine of the type described, a

winding mandrel comprising a boss, adapted for rotation about a transverse axis, means on said boss for engaging a strip to be wound, means for rotating said boss, a member adapted to exert pressure on said strip transversel to the axis of said boss, and means on said member for guiding sa'id stri 3.p In a machine of the character described, a winding mandrel comprising a boss adapted for rotation, means on sa'id boss for engaging a strip to be wound, a flexible spacin strip superposed on said strip to be Woun adapted for rotation about a transverse axis,-

said boss havin a shoulder connecting the initial and terminal points of its enerating helix and means at the base of sa'i shoulder yfor engagin a strip to be wound, means for rotating sai boss, a member adapted to exert pressure on said strip transversely to the afxis of said boss, means for normally holding said member in inoperative position, and means for bringing said member into pressure-exerting relatlon to said strip.

6. In a machine of the type described, a windm mandrel comprising a helical boss adapte for rotation about a transverse axis, said boss havin a shoulder connecting the inltial and terminal points of its generating helix and means at the base of saidshoulder for engaging a: strip to be wound, means for rotating said boss, a member adapted to exert pressure on said stri transversely to the axis of said boss, an means on said member for guiding said strip.

7. In a' machine .of the type described, a windin mandrel comprising a helical boss adapte for rotation, said boss havin a shoulder connecting the initial and terminal points of its generating helix and havin means at the base of said shoulder for engaging a strip to be wound, a flexible spacin strip superposed on said strip to be woun the height of sa'id shoulder being substantially equal to the combined thickness of said strips and means for rotating said mandrel.

S. n a machine of the type described, a winding mandrel comprising a helical boss a'dapted for rotation about its axis, lsaid boss exerting pressure in a direction transverse having a shoulder connecting the initial and to the axis of said mandrel on the strip to terminal points of its generating helix and be wound, and means for rotating said having an axially-extending groove at the mandrel.

base of said shoulder, a: strip to be wound In Witness whereof, I have hereunto set l5 having an angular lip for engaging said my hand at Indianapolis, Indiana., this 8th groove, exible spacing strip superposed on day of December, A. D., one thousand nine said strip to be wound, the height of. said hundred and twenty-five.

shoulder being substantially equal to the l0 combined thickness of said strips, means for JAMES ARTHUR HITTLE.

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