US2391957A

US2391957A - Wire-drawing block

Info

Publication number: US2391957A
Application number: US509266A
Authority: US
Inventors: James M Fenner; Frank G Mog
Original assignee: American Steel and Wire Company of New Jersey
Current assignee: American Steel and Wire Company of New Jersey
Priority date: 1943-11-06
Filing date: 1943-11-06
Publication date: 1946-01-01
Anticipated expiration: 1963-01-01

Description

Jan. "l, 1946. y J. M. FENNER ETAI. 254391,957

WIRE-DRAWING BLOCK y Filed Nov, 5, 943 3 Sheets-Shed'. 2

INVENTORS JAMES/W FEA/NER c and FRA/vA/ Mo G,

Jan. L 1946- J. M. FENNER ET AL WIRE-DRAWING BLOCK Filed NOV. 6, 1945 fig.

3 Sheets-Sheet 5 INVENTORS v JAMES //Z FEA/NER am' FQA NK Gf M06,

Patented Jan. 1, 1946 c wma-pimms nLocx James M. Fenner, South Euclid, and Frank G.

-Mog, Cleveland, Ohio, assignors to The American Steel and Wire Company of New Jersey, a corporation of New Jersey Application November s, 1943, sername. 509,266

L 6 Claims.

In wire or rod drawing operations, the work being drawn customarily is pulled through the drawing dies by means oiY a rotary power-driven block upon which the drawn wire or rod is wound as it is pulled through the dies, the output from the dies being determined and limited by a num-` ber of factors, one of which is the speed at which the work is drawn through the dies, which speedis determined by the acceleration of the drawing block fromzero to maximum speed thereof. If this acceleration is too high, the wire will break before the block reaches its maximum speed, or where the operating speed isl slow, output is reduced, this being the usual circumstance.

In accordance with the present invention, there are provided certain improvements in the construction of driving mechanism for a drawing block, whereby the output of the drawing operation is very substantially increased, and the fblock can be operated at a much higher speed than formerly, but without danger of breaking the wire during acceleration of the block to the higher speed.

ln general, it may be noted that for simplicity and economical maintenance, a jaw clutch is used in the conventional practice to start the block. But a jaw clutch starts a block almost instantly, so that, therefore, the maximum speed that wire can be drawn in this manner is comparatively low. Accordingly, in accordance with the present invention, to obtain a higher speed, mechanism has been developed whereby the block is brought to full speed by two successivesteps as will become apparent hereinafter.

The present invention will be more readily understood by reference to the accompanying draw- `ar to the upper part of the mechanism of Figure l, but showing the draw block disengaged from its dri connection;

Figure 4 is an inverted plan view of the crosspiece which forms an upper bearing forthe drive shaft and connection for raising and lowering the draw block into and out of engagement with its driving means;

Figure 5 is a detailed sectional plan view of a I6, and is keyed tothe countershaft 20.

clutch for driving one of the power-transmission gears, the view being taken on the line V-V of Figure 1, looking in the direction of the arrowsg Figure 6 is a plan view of a clutch member e/m-v ployed for driving the draw block. .v

Referring more particularly to the drawings, the reference character A represents a frame on which is mounted a block B for pulling wire through drawing dies. l

Customarily, the drawing block B operates at a single speed, the acceleration to this speed be ing suilciently slow to avoid breaking the wire being drawn.

A drive shaft 8 is shown carrying a bevel gear l0, the shaft 8 being driven from a suitable source of power (not, shown). The gear lll, in turn, meshes with a bevel gear l2 which is mounted on a spindle Mand is freely rotatable around the said spindle, so that the gear I2 is rotating continuously andl independently of the spindle. 4

The gear l2 has a spur gear I6 mounted on it, the spur gear I6 being shown as an integral part of the bevel gear l2. The spur gear ,I6 meshes with a spur gear i8 mounted on a countershaft 20 and keyed to the shaft so that the gear i8 and shaft 2B are rotating continuously with the gears l@ and-l2. Y

Gear I6 carries a spiral clutch member 22, while the spindle I4 has keyed to it for vertical movement as well as rotation with the spindle, the complementary spiral clutch member 24, which is controlled by a lever 26 and yoke 28, the lever being pivoted to the rear of the frame A at point `29.

The spindle M carries the block B through suitable clutch instrumentalities which will be referred to in greater detail hereinafter, engagement of such clutch nstrumentalities as well as engagement of

clutch members

22 and 24 causing the block B to be rotated at high speed, which is the speed of rotation of the shaft 8 and gears l2 and i6.

As shown, the gear I8 is larger than the vgear The countershaft 20 rotates in

bearings

30, 32 and is vsurmounted by a ring 34 suitably secured to the ing effected through gears I6, I8, 38 and 36, the

clutch members

22 and 24 being disengaged.

The gear 38 is releasable from shaft 28 through the provision of a one-way friction clutch which consists of a plurality of eccentric pockets 48 in the surface of the gear 38 in which are disposed balls 42 which are of suitable hardness, as well as are the pockets 48, to withstand operating pressures. At slow starting speeds the balls 42 are retained'in the constricted portions of the pockets 48, forming a drive connection between the shaft 20 and gear 38, which connection is broken responsively to engagement of

clutch members

22 and 24, which engagement accelerates gear 36 and causes gear 38 to turn faster than the countershaft 28.

When this occurs, the balls 42 are caused to move outwardly into the enlarged portions of the pockets 48, thereby breaking the drive connection between gear 38 and countershaft 28, thereby permitting the resulting relative movement therebetween.

It has been noted above that the block B is controlled by a clutch mechanism, this mechanism enabling the block to be stopped independently of the remainder of the mechanism. This clutch f mechanism includes a disk 44 which is rotatably mounted on the spindle I4,-and is fixed thereto,

the disk 44 having a shoulder 46 thereon for engagement with lugs 48 on the under surface of the' block B.

The block B is lowered and raised into and out of engagement with the rotating disk 44 by means of a foot treadle lever 50 which is attached to the rear of frame A at the pivot 52, this pivot enabling the lever 58 to swing vertically up and down. Midway of the lever 58, at point 54 there is pivotally attached a connecting link 56, which link is attached to a rocker lever 58 at connection 68. 'I'hev lever 58 is hinged at points 62 on crosspiece 64. This cross-piece 64 is a casting which has a portion 66 which serves as a vertical bearing support for spindle I4. The cross-piece 64 is supported on the rear and front sides of the wireconstantly rotating clutchmember 44 by the lifting action of the pi-ns on the block B, thus stopping the rotation of the block. The lift pins and their caps operate through cylindrical openings 98, 92 in the cross-piece 64.

In operation, the equipment is started at slow speed, the lever 58 is tripped by the operator from its holding notch in a lock plate 84 mounted on the side frame of the machine. Lever 26 is similarly mounted and secured.

The raising of lever 58 to the position shown in Figure 2 actuates the rocker lever 58 to depress the

lifting pins

16 and 18, thereby lowering the block B so that the lugs 48 of the block B are engaged by shoulders 46 of the continuously rotating clutch member 44. The block B then is driven from shaft 8 through gears I8, I2, I6, I8, countershaft 20,

gears

38, 36, spindle I4 and clutch 44. This slow speed of rotation is dependent upon the gear ratios between smaller gear i I6 and larger gear I8, and smaller gear 38 and drawing frame by arms 68 18 held in place by screws 1 I.

The rocker lever or yoke 58 is a U-shaped member having arms 12 and 14 which are pivoted at points 62 to brackets 15 on cross-piece 64, near the ends of which arms are mounted lifting

pins

16 and 18, each fof which lifting pins is pivoted to the arms 12, 'I4 of the rocker yoke by pivot pins, such as shown at 88 which form pivotal connections between the lifting pins and the arms of the rocker lever 58, and actuate the lifting pins,

The pins 16 a-nd 18 are each substantially entirely enclosed in a cap member, such as is indicated at 82, which cap members are surmounted with enlarged secondary bearings caps 84, which are forced into place on the cap 82, and held frictionally thereon. These lsecondary caps bear against a flange 86 on the underside of the block B near the periphery thereof so that when the operator presses down on the treadle 88 of lever 58, the links 56 are actuated to rock the rocker lever 58 so as to lift the

lift pins

16 and 18 with their cap structures so that lugs 48 under the block B become disengaged from the larger parts of the pockets 48, thereby breaking the driving connection between the shaft 28 and its gear 38.

The breaking of this driving connection is effected smoothly and gradually responsively to displacement of'the balls 42 from their wedging position to their free position, this action also serving to cushion mechanical shock transmitted to the drawing block B as itis shifted from slow to high speeds responsively to engagement of the

clutch members

22 and 24; andthere is no hesitancy or momentary stoppage when the machine is shifted from slow speed to high speed, thereby obviating either breaking of the wire being drawn, or the "necking down of such wire, the drawing proceeding smoothly and without interruption. The block B may be stopped at any time by simply lifting lever 58 to cause lifting pins 16, 18to lift -the block B out of engagement with the clutch member 44.

From the foregoing, it will be seen that the

clutch elements

22 and 24 constitute a master ,control clutch for the apparatus, engagement oi these clutch elements through actuation of the lever 26 shifting the speed 'of rotation of the spindle and block from slow speed to high speed, while the slow speed gear train constituting the second bevel gear I2, the first spur gear I6 and the second spur gear I8 continues to be operated,- so that it is immediately available to rotate the spindle at slow speed responsively to actuation of lever 22 to separate the

clutch elements

22 and 24, whereby restoring automatically the driving connection between the third spurgear on the countershaft 28 and the said countershaft by wedging the balls 42 in the narrow portions of the pockets 48 by shifting the fourth spur gear from high speed to low-speed, thus shifting the third gear from high speed to low speed.

It will be seen that the rst spur gear Il is equal in size and the number of teeth to the third spur gear 38, and that the second spur gear I8 is equal in size and number of teeth to the fourth spur. gear 38, which is mounted on the spindle Il to rotate the spindle, so that the gear ratio between the first spur gear I6 and second spur gear I8 is equal to the gear ratio. between the third spur gear 38 and fourth spur gear 36, so that except when the

clutch elements

22 and 24 are engaged, the spindle I4 rotates at the same speed as the countershaft 20.

With reference to the rocker yoke 58 and its arms la and 14, itis apparent that the point of application of power, that is the connection 60, must be on the longitudinal axis of the yoke, so that the arms 12'and 'I4 will have equal motion around the fulcrums 60, so that the lifting pins 'I8 and 18, which are of equal length, and which are diametrically opposite4 to each other, will have equal motion for moving the block B exactly parallel to the spindle H each time that the block is lifted from the clutch disk B4 and lowered onto the said clutch disk, so that there will be a tendency of binding between the block and spindle as the block is lifted and lowered.

It may be noted also that Athe cap members 32 are tted snugly over the lifting pins, and that- Ythe secondary caps Bil are the actual abutment members engaging the underside of the block at the peripheral flange 86,'thereof, so that when the block is stopped by lifting from the clutch disk N when the latter is rotating at high speed, the cap members 84 are subject to considerable wear and consequently they are readily replaceable by simply slipping new ones in place of those that have become worn.

We claim:

1. Multiple speed mechanism for driving a wiredrawing block at a plurality of selected speeds, which comprises the combination with the Wiredrawing block, of a rotary spindle carrying the block, a driving shaft, a bevel driving gear mounted on the shaft and driven thereby, a` second bevel gear driven by the driving gear, the second bevel gear being mounted on the spindle but being rotatable independently of the spindle, a iir'st spur gear integral with the second bevel gear, ,a clutch element rigidly mounted on the first spur gear, a countershaft, a second spur gear on the countershaft in mesh with the first spur gear, the second spur gear being llarger than the first spur gear for driving the countershaft at a predetermined slower speed than the speed of the first spur gear and second bevel gear, a third spur gear on the countershaft, a fourth spur gear mounted on the spindle meshing with the said third spur gear, the third and fourth spur gears having a vratio inversely of the ratio between the second and third spur gears, whereby the spindle is driven at a speed of rotation equal to that of the countershaft, clutch means on the spindle and slidable relatively thereto for engagement with the clutch means mounted on the first spur gear, mechanism for operating clutch means for driving the block directly from the second bevel gear and rst spur gear and at a speed of rotation greater than that obtained through the countershaft, and means in the third spur gear for breaking driving connection between thev countershaft and third spur gear responsively to acceleration of the third spur gear incident to engagement of the said clutch means, whereby the said third spur gear is driven at a speed of rotationgreater than that of the countershaft.

carrying the block, a driving shaft, a driving gear mounted on the shaft, a second gear mounted on the spindle but rotatable relative thereto and independently thereof, the said second gear being in mesh with the driving gear, a countershaft, means? on the countershaft adapted to be driven from the second gear at a predetermined speed of rotation less than that of rotation of the second gear, clutch means mounted on thesecond gear and continuously driven therewith, complementary clutch mechanism carried by the spindle and slidable relative thereto, means fory V transmitting motion from the countershaft to thespindle, instrumentalities for operating the clutch mechanism on the spindle for bringing the same into engagement and disengagement, respectively, with the clutch means on the secon'd gear, whereby the wire-drawing block may be driven directly from the second gear subsequent to an initial relatively slower rotation through motion transmitted through the countershaft, and means releasably; connecting the motion-transmitting means from the countershaft to enable the said means to be driven at a speed of rotation greater than that of the countershaft. l l

3. Multiple speed mechanism for driving a wire-drawing block at a plurality of selected speeds, which comprises the combination with the wire-drawing block, of a rotary spindle carrying the block, a driving shaft, a bevel driving gear mounted on the shaft and driven thereby, A a second bevel gear driven by thedriving gear, f

the second bevel gear being mountedon the 'spindle but being rotatable independently of the spindle, a first spur gear integral with the second bevel gear, a clutch element mounted 'on the first spur gear, a countershaft, a second spur gear on the countershaft in mesh with the first spur gear, the second spur gear being larger than the first spur gear for driving the countershaft at slow speed, a third spur gear on the countershaft, 'a ,fourth spur gear on the spindle, the fourth gear being mounted on the spindle for rotating the spindle, a clutch member on the spindle adapted to engage the clutch element on the first spur gear for driving the spindle at accelerated speed directly from the driving shaft through the bevel gears and first spur gear, and

2. Multiple speed mechanism for driving a v a one-way clutch between the third spur gear and the countershaft, the said clutch including means for automatically releasing the third spur gear from the countershaft responsively to acceleration thereof from the fourth spur gear in response to acceleration thereof incident to, operative engagement of the clutch member on the spindle andthe clutch element on the first spur gear. i

4. Multiple speed mechanism for driving a wire-drawing block at a plurality of `selected speeds, which comprises the combination with the block, of a rotary spindle carrying the block, a driving shaft, a driving gear mounted on the driving shaft, a countershaft, a rst gear train vconnecting the spindle and countershaft, the

said gear train including gears mounted on the spindle but rotative-independently thereof, andl a gear on the countershaft, the gears on the spindle being driven directly by the driving gears,

a clutch member carried by the gears on the spindle, the gear train having a gear ratio producing a speed of rotation of the countershaft substantially less than that of the gears on the spindle, asecond gear train between the countershaft and spindle includinga second gear on the countershaft and another gear on the spindle for rotating the said spindle, the said second v gear train having a gear ratio equal to but inversely of that of the nrst gear ratio, whereby the spindle is driven at the same speed as the countershaft, a clutch member keyed to the spindle, operating mechanism for the clutch member for engaging the clutch memr with the said clutch member on the said gears. thereby driving the spindle at an accelerated speed directiy from the said driving shaft and driving gear, means for the second gear train for auto matcaby breaking driving connections between the gear tram and countershaft responsively to acceleration of the gear train and bloeit when the clutch members are engaged for rotating the block at high speed, and means for lifting the block from the spindle for stopping the block while continuing rotation of the spindle.

5. Multiple speed mechanism for driving a wiredrawing block at a plurality of selected speeds,

which comprises the combination with the wiredrawing block, of a rotary spindle carrying the block, a driving shaft, a bevel driving gear mount ed on the shaft and driven thereby, a second bevel gear driven by the driving gear, the second bevel gear being mounted on the spindle but being rotatable independently of the spindle, a firstI spur gear integral with the second bevel gear, a clutch element mounted on the first spur gear, a countershaft, a second spur gear on the countershaft in mesh with the first spur gear. the second spur gear being substantially larger than the first spur gear for driving the countershaft at a predetermined slower speed than the speed of the first spur gear and second bevel gear. a

third spur gear on the countershaft, a fourth spur and block may be driven at a fast speed, with attendant fast rotation of the third spur gear from the now rapidly rotating fourth spur gear, and a one-way clutch in the third spur gear adapted to break automatically the driving connections between the third spur gear and driving shaft upon acceleration of rotation of the third spur gear faster than the rotation of the countershaft. the clutch comprising eccentric pockets in the gear. and bali members in the pockets bearing on the countershaft, the balls becoming wedged between the gear and countersliaft at slow speed to drive the gear and countershaft together and becoming displaced into wide portions of the said pockets at high speed of the gear, thereby breaking the driving connection between the gear and countershaft and enabling the gear to rotate around the shaft independently thereof.

6. Multiple speed mechanism for driving a wiredrawing block at a plurality of selected speeds, which comprises the combination with the wiredrawing bloeit, ci .a rotary spindle carrying the bloclr, a. driving shaft, bevel driving gear mounted on the shaft and driven thereby, a second bevel gear driven by the driving gear, the second bevel gear heilig mounted on the spindle but being rotatable independently of the spindle, a rst spur gear integral with the second bevel gear, a clutch element mounted on the first spur gear. a second spur gear on the countershaft in mesh with the first spur gear, the second spur gear being substantially larger than the first spur gear for driving 'the countershaft at a predetermined slower speed than the speed of the rst spur gear and second bevel gear, a third spur gear on the countershaft, a fourth spur gear mounted on the spindle and fixed thereto for rotation of the spindle, the fourth spur gear meshing with the third spur gear and being substantially larger than the third spur lgear, the third and fourth spur gears having a gear ratio equal to the gear ratio between the second and third spur gears,

whereby the spindle may be rotated continuously at a speed equal to the speed of rotation of the countershaft, a clutch element on the spindle adapted to be engaged with the clutch element on the rst spur gear, whereby the spindle and block may be driven at a fast speed with attendant fast rotation of the third spur gear from the now rapidly rotating` fourth spur gear, a one-Way clutch in the third spur gear adapted to break automatically driving engagement between the third spur gear and driving shaft upon acceleration of rotation of the third spur gear faster than the rotationy of the countershaft, and mechanism for lifting the block from the spindle to stop the block without disturbing rotation oi the spindle, and for lowering the block onto the spindle while the lspindle is rotating at slow speed.

JAMES M. WNNER. FRANK G. MOG.