US1321202A - Heeling-machine - Google Patents

Description

L. L. GLIDDEN.

HEELING MACHINE.

' APPLICATION FILED "AR- !21 1917- 1,321,202. Patented Nov. 11,1919.

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a. W M w L. L. GLIDDEN.

HEELING MACHINE.

APPUCATION FILED MAR. 12. 1917. 1,321,202. Patented Nov. 11,1919.

3 SHEETS-SHE 3.

UNITED STATES PATENT onrron.

LESTER L. GLIDDEN, OF NATICK, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGN MENTS, TO UNITED'SHOE MACHINERY SEY, A CORPORATION OF NEW JERSEY.

coarogeatrlon, or EATER/SON, NEW Jea- HEELING-MACHINE.

Application filed March 12,

To all whom it may concern:

Be it known that I, LESTER L. GLIDDEN, a citizen of the United States, residing at Nat-ick, in the county of Middlesex and State of Massachusetts, have invented cer tain Improvements in' Heeling-Machines, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures. I

This invention relates to heeling machines and, more particularly, to that type, of heeling machine which is adapted to attach heels to shoes while the 'shoes are still on the wooden last upon which they are made.

' In heeling shoes upon. the wooden last, it is well known to those skilled in the art that there is danger of 'crushing or damaging the last if too great a pressure is applied to the work in the heel attaching operation. It is the general object of the present invention to provide a heeling machine equipped with mechanism for preliminarily measuring and applying the final pressure to thework without the liability of damaging the last while, at the same time, the attaching operation is uniformly and accurately performed. i

In pursuance of the general object above stated, and other objects, one important fea ture of the-invention resides in the provision in a heeling -machine of measuring mechanism' and positive final pressure mechanism.

with connections between the two for keeping the operation of one'of said mechanisms under the control. of t-he'other. The final pressure mechanism is preferably separate from, and under the control of, the measuring mechanism, the construction, and arrangement being such that the final pressure mechanism is maintained in predetermined operative relation to thework support, re-

gardless of the variable amount of movement imparted to the latter by the measuring mechanism when operating upon work of different thicknesses. In a convenient construction, the measuring mechanism is positively connected to a beam carrying the work surmort, and the final pressure mechanism is so connectedto the beam, or to the" measuring mechanism, that it remainsin engagementwith the beam,or at a predetermined distance therefrom, 1 throughout the of the nail driving operation.

Specification of was Patent, Patented 11,1919.

1917. Serial No. 154,176.

movement of the latter during the measuring operation.

Another feature of the invention resides in improved means for locking the work the heel, the upward pressure due to the nail drivin is sufficient to raise theheel slightly from t e nailing die, even though the work support may be solidly locked against movement. Under these conditions there is danger that the nails will be crippled and the work damaged. In this connection, another important feature of the invention resides has been many times observed in the In the specific embodiment of the in the provision of improved means for pro- 4 gressively and gradually increasing the pressure upon the work during: the progress I I have found that this effectually overcomes the difficulty with the accompanyingdrawings, in which,

Figure l is a view in side elevation'of a heeling machine embodying the invention;

Fig. 2 is a perspective view of the rear portion of the mach ne;

Fig. 3 is a longitudinal section of the pres 7 sure locking and releasing mechanism;

V Fig. i is an exploded view of the pressure locking mechanism;

Fig.5 is a perspective view illustrating thed eta-ils of the'unlocking mechanism; and Fig; 6 is a fragmentary view of the treadle mechanism for controlling theioperation of themachine.

Referring to the drawings, a conventional mentioned and greatly reduces the liabll ty Other'features and advantages of the i iheeling machine frame or base is represented at 10. A stationary nailing die 12 has the usual holes in which the nail drivers 1% travel. The driversare carried upon a reciprocating spindle 16 which is actuated by a toggle 18 and connecting rod 20, connected to the crank pin 22 of the crank shaft 2 1. 26 re Jresents the stop arm of a one-revolu tion Horton clutch arranged to controlthe operation of the crank shaft. The arm 26 is normally held in engagement with the clutch stop member, to permit the crank shaft to remain stationary, by a pull spring 28.

A jack or work support 30 depends from the forward end of the top lever 32, which is pivotally mounted in the frame 10 at 34:. The upper end of the back rod 36 is pivotally connected to the rear end of the top lever 32 at 38.

Secured to the lower end of the rod 36 is a piston 38 suitably guided for vertical reciprocation in a cylindrical bore formed in a bracket 40 secured to the rear of the frame 10.

Etrong pull springs 42 are attached at H to the lower end of the piston 88. The upper ends of the springs are engaged by hooks l6, which are adjustable to vary the tension of the sprin s by means of bolts 4:8

threaded into a stationary bracket se cured to the machine frame. The springs 42 are always under tension and tend to elevate the rod 36 and consequently to lower the jack 30; bringing the shoe and heel together under some pressure. This is technically known as measuring the work.

One link 52 of a toggle is also pivotally connected to the lower end of the back rod at 4st, and the other link 5% of the toggle is pivoted at a stationary point 56. The center of the toggle is connected by a link 58 to a pressure locking screw 60. The screw 60 is guided for reciprocating movement through a stationary bracket 62 and a nut 64. The outer surface of the nut is conically formed and the nut is located in a correspondingly conically formed recess in the casting 66 secured to the frame 10; The screw 60 is slotted at 68, see Fig. 4:, to permit the passage of a transverse bar 70, which ngages a ball thrust bearing 72 resting upon the upper end of the nut. Another hall thrust bearing 74 is provided at the opposite endsof the nut 64. Tension springs 76, acting upon the ends of the bar 70, tend to draw the nut downwardly and seat, it frictionally in the conical recess in the casting 66. A cap plate 78 covers the recess.

When the measuring springs 42 are permitted to operate to move the back rod 36, th toggle 52, 5% will be straightened more or less according to the amount of movement of the rod. This straightening of the the tension of the spring 92, u

against the ball bearing 72. As soon, how

ever, as the longitudinal movement of the screw ceases, the springs 7 6 draw the nut downwardly and seat it frictionally in its conical bearing, where it acts as a locking device toprevent movement of the screw and, consequently, to prevent any yielding or reverse movement of the back rod 36, which cannot occur without breaking the toggle 52, 5a.

In order to maintain the toggle in broken condition and the jack separated from the nailing die to permit removal and insertion of the work, mechanism is provided, which will now be described. Connected to the center of the toggle 52, 54 is one end of a link 80, theother end of which is pivotally connected to the upper end of a rocking lever 82, mounted to oscillate about I a stationary pivot 8%. A latch bar 86 is connected at an intermediate point upon the lever 82. The forward end of the latch bar is formed with a shoulder 88, as shown in Fig. 6, which is normally held in engagement with a stationary. stop 90 by a spring 92 which is under tension, tending to elevate the bar. lVhen the parts just described are in the position shown in the drawings,

the forwardly projecting end of the bar 86. W hen th treadle is depressed the forward end of the bar is depressed, against ntil the shoul der 88 passes below the stop 90. T he measuring springs l2 may then operate to measure the work, this operation being accompanied by a straightening of the toggle 52, 5% and a forward movement of the bar 86.

A link 102 is pivoted to the rear end of the treadle and is provided with a slot 10i which forms a lost motion connection with a pin 106 mounted in the clutch stop arm 26. Thus, after the release of the bar .86 and the consequent operation of the measuring mechanism, further depression of the treadle will cause the machine to be started.

Upon starting the machine, the first thing to be done is to apply the final pressure to the work preparatory to driving the nails. Forthis purpose I have provided mechanism under the control of the measuring mechanism. A pair of pressure cams 108 is mounted. upon the crank shaft 24-. Resting upon these cams is a pair of cam rolls 110 mounted inthe lower forked end of a slide 112 which is guided for vertical rBi iprocation in a guide 114 secured to the ma -the rear end of the lever" 32.

chine frame. The lower ends of the fork are are provided with slots 116 embracing the crank shaft 24 and serving to guide the lower end ofthe slide. To the upper end of the slide 112 is pivoted a swinging arm 118.

A pressure head 120 is threaded into the upper end of the arm 118 and arranged for engagement with the'under face of a block 122 mounted upon the rear end of the top lever 32. The arm 118 is connected by a link 124 to one, arm of a bell crank lever 126 pivoted to the frame 10 at 128. The other arm of the bell crank lever is pivoted to a connecting member 130 provided with a slot' 132 whichembraces the pivot 38 at A spring pressed plug 134 in the upper'end of the connecting member 130 bears upon the pivot 38, tending to hold it in the bottom of the slot 132. j V v The curvature of the lower face of the block 122 is such thatwhen the rear end of the top lever 32 is moved upwardly in the measuring operation and, consequently, by reason of the connections 130, 126, 124, the arm 118 is swung rearwardly, the pressure head 120 moves ina path parallel to the face of the block; that is'to say, the pressure head is always at the same distance from the This distance consequently, the

ward movement of the lever. may be varled, and,

amount of final pressure to be applied to the work may be regulated, by adjusting the pressure head into or out of the arm 118.

The adjustment is maintained by any suit- An arm 156 secured to the shaft 154 is connected by a link 158 to an unlocking lever 160 pivoted at'162 in the casting 66. The lower end of the lever 160 is forked and arrangedto engagethe' cover plate of the ball thrust bearing 7 4. Whenthe cam-r011 144' is' in the depressed portion of the cam 138, the forked end of thelever 160 is re tracted sufiiciently'to permit the locking cone 64 tosettle into its bearing and be frictionally locked against rotation, but at the proper point in the revolution of the crank shaft, after the nails have been driven, a rise on the cam 138' causes the unlocking lever 160 to be moved to lift the conical nut out of its seat, whereupon it is pertion of the back rod, a roll 164 is mounted upon the pivot connecting the lever 82 and the link80, and is arranged to be engaged by a hardened-plate 166 upon the rear end of the connecting rod 20 as the connecting rod approaches the limit of its return stroke toward stopping position. A stop screw 168, threaded into the bracket 62, controls the limit of retraction of the lower end of the lever 160. When the connecting rod 20 in its return movement, through the roll 164 and link 80, has broken the toggle 52, 54 and restored it to initial position, the latch bar 86- is raised by the spring 92 until the shoulder 88 engages the stop. 90, holding the parts against the tension of themeasuring springs.

The operation of the machine is as follows: The machine being at a standstill with the parts in their initial positions, as shown in the drawings, a shoe is jacked and a heel and top lift inserted in the holder. lVith the work in position, the treadle is depressed sufliciently to unlatch the bar 86, whereupon the measuring springs 42 operate to elevate {the back rod36 and lower the jack to seat" block, regardless of the upward or downthe shoe firmly upon the heel. This oper: ation is accompanied by a straightening of the toggle 52, 54, and a movement of the screw 60 through its nut, which is drawn up against the ball thrust bearing 72 and consequently permitted to rotate freely. As soon as the movement of the screw ceases, the springs 76 cause the nut 64 to settle down into its conical bearing, where it is frictionally held against rotation, locking the work-under the pressure of the measuring springs. treadle causes the clutch stop arm 26 to be thrown forwardly and the crank shaft of the,

machine to be turned through a revolution. A rlse on the cam 108 immediately causes the sllde 112 and the arm 118 to be raised through a fixed distance. During this upward movement the pressure'head 120 engages the block 122 and applies the final pressure" to the work. The pressure head has been maintained at a predetermined dis I tance from the block 122 during .the measurmg operation by the connections previously described, and the amount of the final pressure is determined by the distance through which the pressure head travels upwardly before it 'encountersthe block. The holes in the nailing die 12 are sufliciently. deep so that the points of the nails do not enter the heel until after the final pressure has been applied. The upward movement of the back rod 36, incident upon the application of the final pressure, is accompanied further movement of the screw 60 through its Further depression 'of the nut, and the nut is again drawn down into its seat, locking the work under the final pressure. Thereupon, the further rotation of the crank shaft causes the nails to be driven through the heel into the shoe. The cam 108 is formed with a small and gradual rise from the point where the nail driving operation begins to the point where it is finished, so that a progressively increasing pressure is being applied to the work as the driving of the nails progresses. It has been found that this application of progressively increasing pressure during the nail driving operation prevents the work from being separated from the nailing die with a resultant possibility of crippling the nails.

After the nails have been driven, and while the drivers are being retracted, the rolls 110 drop 'ofi the high portions of the cams 108, releasing the work from positive pressure. The cam 188 then operates, through thetrain of connections shown in Fig. 5, to unlock the conical nut 64: and raise it from its seat sufficiently to permit it to rotate freely. The roll 164: is then engaged by the plate 166 on the end of the connecting rod and the operating mechanism is retracted to its initial position, whereupon the roll 14-1 drops off the high portion of the cam 138, the latch bar 86' is engaged with its stop, and the machine is stopped, ready for a repetition of the operation. If the work is blind nailed, the treadle is again immediately depressed and the top lift spanked upon the heel, the machine opcrating in precisely the same manner as when nailing the heel, except that no nails are driven.

Having described the invention, what is claimed as new and desired to be secured by Letters Patent of theUnited States is 1. In a heeling machine, the combination of a stationary work pressing member, an opposed pressing member movable toward and from said stationary member, measuring mechanism for preliminarily moving the movable member into pressing engagement with the work, and final pressure mechanism including a power-operated member having a fixed stroke, and automatically variable connections between the power-operated member and the movable work engaging member.

2. In a heeling machine, the combination of a stationary work-engaging member, an opposed work engaging member movable toward and from the stationary member, measuring means for preliminarily moving the movable member into pressing engagement with the work, and positivefinal pressure mechanism including a power-operated plunger, variable connections between the plunger and the movable -work-engaging .member, and means controlled by the movement of said work engaging member for preserving a substantially constant actuating relation between the plunger and the member.

3. In a heeling machine, the combination of a stationary nailing die, an opposed jack movable toward and from the die, measuring means operable preliminarily to move the jack into pressing engagement with the work, and final pressure mechanism including a power operated plunger, variable connections between the plunger and the jack,

and jack operated means for controlling said connections to preserve a substantially constant relation between the plunger and the ack.

4. In a heeling machine, the combination of a stationary nailing die, a movable jack, a power-operated final pressure member, means for effecting measuring movementof the jack independently of the final pressure member, and means connected to and operated by movement of the jack for preserving a substantially constant operating relation between said member and the ack.

5. In a heeling machine, the combination of means for suddenly subjecting the work to final pressure, means for driving nails, and means for graduallyincreasing the final pressure upon the work after the beginning of the nail driving operation.

6. In a heeling machine, the combination of means for suddenly subjecting the work to final pressure, means for driving nails, and means for more slowly increasing the final pressure upon the work during the entire nail driving operation.

7. In a heeling machine, the combination of means for suddenly subjecting the work to final pressure, means for driving nails, and means for progressively increasing the final pressure upon the work throughout the progress of the nail driving operation.

8. In a heeling machine, the combination of means for suddenly subjecting the work to final pressure, means for driving nails, and means for progressively and gradually increasin the final pressureupon the work during the progress of the nail driving operation.

9. In a heeling machine, the combination of a work support, means for moving the work support to apply pressure to the work, and a pressure locking device comprising a toggle, one end of which is connected tothe work support and the other end of which is held. against movement while the work is under pressure, the construction and arrangement being such that the toggle is progressively straightened as the work support is moved to apply pressure to the work, and means for preventing breaking of the toggle, whereby the work is looked under pressure.

10. In a heeling machine, the combination of a work support, means for moving the work support to apply pressure to the work,

and a separate pressure locking device comprismg a toggle constructed and arranged to be progressively straightened by the pressure applying movement of the work supn ort and means for reventino breakin of to the work, lost motion connections between the power mechanism and said member, means connected to said member for effecting a preliminary work measuring operation, and means under the control of said measuring means for preserving a uniform amount of lost motion in said connections throughout the operation of the measuring means.

12. In pressure mechanism for heeling machines, the combination of a'work engaging member, power mechanism for moving said member positively to apply pres sure to the work, lost motion connections between said power mechanism and said work engaging member, means for preliminarily adjusting the amount of lost motion in said connections to vary the pressure tobe ap plied, means for preliminarily moving said member into pressing engagement with the work to measure the work, and connections between the measuring means and the lost motion mechanism whereby the operation of the latter is under the control of the former.

, 13. Inca heeling machine, the combination of a work engaging member, a beam supporting said member, power operated means including a swinging arm and a cooperating curved face on the beam for moving said member to apply pressure to the work, inclependent means for preliminarily moving the beam to measure the work, and connectin means between the beam and the arm to etfeet swinging movement of the latter during said curved face, measuring mechanism, and

connections'between the measuring mecha-- nism and the swinging member to effect swinging movement of the latter. I y In testimony whereof I have signed my name to this specification.

LESTER L. GLIDDEN.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

' Washington, D. G. 1

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