US1081456A - Tack-driving machine. - Google Patents

Description

F. L. MAOKENZIE.

TACK DRIVING MACHINE.

APPLICATION FILED 11111.11, 1911.

l ,081 ,456. Patented Dec. 16, 1913.

2 SHEETS-SHEET 1.

F. L. MAOKENZIE.

TACK DRIVING MACHINE.

APPLICATION FILED 11111.11, 1911.

L8l945@ Patented Dec. 16, 1913.

2 SHEETS-SHEET 2.

l?? We @@21- COLUMBIA P'LANoaRAFH co., WASHINuToN. D. d.

UNITE@ STATES sirena oriana.

FRED L. MACKENZIE,

OF BEVERLY, MASSACHUSETTS, ASSIGNOR T0 UNITED SHOE MACHINERY COMPANY, OE PATERSGN, NEW JERSEY, A CORPORATION OE NEW JERSEY.

TACK-DRIVING MACHINE.

insiase'.

Specification of Letters Patent.

Patented Dec. 16,1913.

To alt whom t may Concern Be it known that I, FRED L. MACKENZIE, a citizen of the United States, residing at Beverly, in the county of Essex andState of Massachusetts, have invented certain new and useful Improvements in Tack-Driving Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

rIhe present invention relates to tack driving machines and more particularly to machines which are employed for driving holding tacks into a lasted shoe to hold the upper in place after the lasting tacks have been removed, although the invention is capable of use in tack or nail driving machines which are used for other purposes.

In the manufacture of a welted shoe, it is customary to withdraw all of the lasting tacks, except those which hold the toe wire in place, before the welt is sewed upon the shoe and insert in place of the lasting tacks a sufficient number of holding tacks to retain the upper in position upon the last during the sewing operation. In order that the operator may pull the lasting tacks and insert the requisite number of holding tacks during a single manipulation of the shoe, combined tack pulling and driving machines have been devised. In these machines, the mechanism for driving the holding tacks is under the control of the operator whereby, upon the depression of a suitable treadle, a l'iolding tack may be driven at any point desired. As it is only desired to drive a single holding tack at any one point, it is essential that the tack driving mechanism shall be arranged to drive only a single tack upon a depressing of the treadle irrespective of the length of time which the treadle is held down, and it is furthermore desirable that after one tack has been driven the tack driving plunger shall be automatically returned to its initial position and held in this position independently of the treadle, in order that another tack may be instantly driven when the treadle is again depressed.

The object of the present invention is to provide a machine of the character described which drives the tacks with precision and certainty, and-in which the operator is prevented from driving more than a single tack jupon each separate actuation of the control ,mechanism.

i TWith this object in view, one feature of Iithe invention contemplates the provision of a spring actuated tack driving plunger, means for normally holding the plunger in a raised position, power actuated mechanism for releasing the holding means, control mechanism adapted to set the power actuated mechanism into operation at the will of the operator, and independent means for rendering the power actuated mechanism inoperative after the holding means have been released.

In addition, another feature of the invention consists in the combination of a spring actuated plunger, continuously operated means for elevating the plunger, means for holding the plunger in an elevated position, and mechanism actuated in timed relation with the elevating means to release the holding means and allow the plunger to be depressed, the said mechanism being under the control of the operator.

A further feature of the invention consists in the provision in a machine of the character described comprising a spring actuated tack driving plunger and means for holding the plunger' in a raised position, of mechanism under the control of the operator to release the holding means and means to render the mechanism inoperative after a single working stroke of the tack driving plunger.

Gther features of the invention consist in certain improved constructions, combinations and arrangements of parts hereinafter described and claimed, the advantages of which will be obvious to those skilled in the art from the following description.

In the accompanying drawings, illustrating the preferred form of the invention, Figure l represents a front elevation of a tack driving mechanism of a well known type, with the preferred form of the present invention applied thereto, said tack driving mechanism forming part of a combined tack pulling and driving machine; Fig. 2 is a side elevation of the mechanism illustrated in Fig. l; Fig. 8 is a detail sectional plan view on the line 8 3 of Fig. 2; Fig. el is a detail sectional view on the line fst- 4 of Fig. 2.

rIhe tack driver shown in the drawings is of well known construction and for this reason has not been shown in detail. It comprises a tack driving plunger 1 which is actuated upon its downward or working stroke by a spring 3. The lower end of the plunger passes through a tack block 5 against the bottom of which the work is held. The supply of tacks is contained in a tack pot 7 from which the tacks are fed to the tack driving plunger by means of a chute 8. A mechanically operated finger 9 projects into the chute at its lower end and engages the tacks to successively move them into position beneath the plunger 1 at the proper time. To automatically raise the plunger to its initial position' after each tack has been driven, a continuously rotating cam 10 is employed which is provided with a laterally projecting cam rib 11 upon one face thereof. The cam rib 11 engages with a projecting shoulder 12 formed upon the connecting rod or plunger 13 and operates to raise the rod and plunger 1 when the plungerl has reached the limit of its downward movement. The plunger is retained in its raised position by a spring pressed latch dog 14 which engages at one end with a notch 15 formed in one face of the shoulder 12. The cam 10 is mounted upon a shaft 16 and is continuously operated from the main drive shaft 17 through the gears 18 and 19.

In order to properly actuate the tack driver, it is essential that means be provided, under the control of the operator, for disengaging the latch dog 14 to allow the plunger to descend and drive a tack and to immediately render this means inoperative in order that the latch shall lock the plunger in its raised position when it is returned by the continuously rotating cam 10. lVth this end in view, the latch dog 14 is pivoted at 20 upon the side of the casing 21 and is connected at its lower end to the outer end of a link 22. rThe link 22 is slidingly mounted in the casing 21 and is provided at its inner end with a downwardly projecting portion 23, which engages with one arm 24 of a bell-crank lever 25. The opposite arm 26 of the bell-crank lever is pivotally connected to a rod 27 so that upon a longitudinal movement of the rod the bell-crank will be oscillated to disengage the latch 14 through the link 22. This longitudinal movement is imparted to the rod 27, when desired, by an oscillating forked arm 23 which is provided with a spring pressed dog 29 adapted to engage with a shoulder 30 formed upon the outer face of the rod 27. The arm 23 is continuously oscillated in a substantially horizontal plane during the operation of the machine, by a cam 31 mounted upon the shaft 16 and provided with a cam groove 32. A cam roll 33, which is journaled upon the outer end of an arm 33, engages with the cam groove 32. The

two arms 23 and 33L are both fixed to a sleeve 34 which is journaled in a supporting bracket 35 fastened to the frame of the machine. The above described mechanism forms what may aptly be termed a power actuated mechanism for releasingthe holding means o-r spring pressed latch dog. The rod 27 is normally held out of engagement with the dog 29 by a yoke-shaped member 36. The member 36 is supported at one end of a longitudinally projecting stub shaft 37 Ywhich is slidingly journaled in a fixed bearing 33, and a stud 39 is threadedly mounted in an offset portion 40 of the member 36. The member 36 is operatively connected with a control mechanism comprising a lateral projection 41 formed upon the upper end of a rod 42 and engaging with the stud 39. The rod 42 is suitably connected to the operating treadle, not shown. Vhen the projection 41 is moved downwardly by the treadle the member 36 is partially rotated to render the power actuated mechanismr operative, that is, to move the rod 27 into engagement with the dog 29 so that the rod is moved longitudinally to disengage the latch 14. The movement of the arm 2S is so timed that the plunger will be released when the projection 11 on the cam 10 is at one side of the projection 12 or in substantially the position shown in Fig. 1.

- If the rod 27 were held in engagement with the dog 29 as long as the treadle was depressed, the machine would continue to drive tacks and as this is not desired, independent means are provided to return the rod 27 to its normally inoperative position after a single longitudinal movement of the rod to disengage the latch dog` 14. To this end a shoulder 43 is provided upon the inner face of the rod 27 which is normally located in the position shown in Fig. 3. Upon a longitudinal movement of the rod to disengage the latch dog, however, the shouldered portion 43 will slide through the member 36, and when the arm 23 commences to move in the opposite direction, the spring pressed dog 29 bearing against the outer side of the rod 27 will retain the shoulder 43 in engagement with the face of the member 36. rl`he rod 27 is returned to its initial position by a spring 44 carrying the member 36 with it and as soon as the head of the stud 39 passes from under the projection 41' the member 36 is moved back to its normal position carrying the rod 27 out of engagement with the dog 29. The finger 9 is con veniently connected to the rod 27 so that the finger is operated to feed a tack simultaneously with the movement of the latch dog to release the tack driving plunger. he rotation of the member 36 is imparted by a coiled spring 45 which is fastened at one end to a head 46 mounted upon the end of the rod 37 and at its opposite end to a head 47 formed upon the bearing 38. 1mmediately upon releasing the treadle, the projection il is raised clear of the stud 89, which is then moved back to its initial position by the spring 45. rl`hus it will be seen that the power actuated mechanism is automatically rendered inoperative after one stroke of the plunger irrespective of the position of the treadle, and that immediately upon releasing the treadle, the various parts of the mechanism will instantly assume their initial positions in order that another tack may be driven when desired. To permit the latch dog la to move freely while the plunger is being raised, the connection between the dog and the slide 22 is arranged to allow the dog to move independently of the slide, the lower end of the dog being slotted to receive the slide, and the slide being provided at its outer end with a cross pin to engage the dog when the slide is actuated by a depression of the controlling trcadle.

lWhile it is preferred to employ the specic construction and arrangement of parts shown and described, it will be understood thatI this construction and arrangement is not essential except so far as specified in the claims and may be changed and modified without departingfrom the broader features of the invention.

Vilhat is claimed, is zl. A tack driving machine having, in combination, a spring actuated tack driving plunger, continuously operated means for raising the plunger, means normally tending to hold the plunger in raised position, mechanism under the control of the operator to release the holding means, and means to render the mechanism inoperative after a single working stroke of the tack driving plunger, substantially as described.

2. A tack driving machine having, in combination, a spring actuated tack driving plunger, continuously operated means for raising the plunger, means normally tending to hold the plunger in raised position, power actuated mechanism for releasing the holding means, and mechanism to control the operation of the power actuated mechanism to allow a single working stroke of the tack driving plunger, substantially as described.

3. A tack driving machine having, in combination, a spring actuated tack driving plunger, continuously operated means for raising the plunger, means for holding t-he plunger in raised position, a continuously oscillated arm, a spring pressed dog mounted upon the arm, avrod normally held out of engagement with the dog, operative connections between the rod and holding means, and means under the control of the operator to move the rod into the path of the dog in order to move the rod and release the holding means, substantially as described.

t. A tack driving machine having, in combination, a spring actuated tack driving plunger, continuously operated means for raising the plunger, means for holding the plunger in raised position, a continuously oscillated arm, a spring pressed dog mounted upon the arm, a trod normally held out of engagement with the dog, operative connections between the rod and holding means, means under the control of the operator adapted to move the rod into the path of the dog in order to move the rod and release the holding means, and means for returning the rod to its normal inoperative position out of engagement with the dog after the holding means has been released, substantially as described.

5. A tack driving machine having, in combination, a spring actuated tack driving plunger, continuously operated means for raising the plunger, means for holding the plunger in raised position, a continuously oscillated arm, a spring pressed dog mounted upon the arm, a rod, operative connections between the rod and holding means, a yoke-shaped member embracing the rod and adapted to normally hold the rod out of engagement with the dog, and

`means under the control of the operator adapted to actuate the yoke and move the rod into the path of the spring pressed dog, substantially as described.

(5. A tack driving machine having, in combination, a spring actuated tack driving plunger, continuously operated means for raising the plunger, means for holding th-e plunger in raised position, a continuously oscillated arm, a spring pressed dog mounted upon the arm, a rod, operative connections between the rod and holding means, a yoke-shaped member embracing the rod, a shoulder formed upon one face of the rod, control mechanism operatively connected to the yoke-shaped member and adapted to move the rod into a position in which the shoulder is engaged by the spring pressed dog in order to slide the rod longitudinally, and means for returning the rod to its normal inoperative position independently of the control mechanism, substantially as described.

7. A tack driving machine having, in combination, a spring actuated tack driving plunger, a continuously rotated cam having a cam rib formed upon one face thereof, a shoulder projecting laterally from the plunger and having a recess formed in one face thereof, the shoulder being adapted to engage with the cam rib to raise the plunger, means for holding the plunger in raised position comprising a spring pressed dog arranged to engage with the recess in the shoulder, and means under the coiitrol of the operator for moving the dog out of engagement with the recess in order to release the plunger, substantially as described.

S. A tack driving machine comprising a spring actuated tack driving plunger, a continuouslyl oscillated arm, a spring pressed dog mounted upon the arm, a rod, a yoke-shaped member embracing the rod, a stud projecting from the yoke-shaped member, a laterally projecting member having its under face engaging with the stud, the rod being provided with shoulders upon its opposite faces, a spring operatively connected to the yoke-shaped member and adapted to normally retain the stud in engagement with the laterally projecting member, and means under the control of the operator for actuating the laterally projecting member in order to move the rod into a position where one shoulder is engaged by the spring pressed dog and moved longitudinally thereby, the opposite shoulder upon the rod adapted to engage with the yoke-shaped member upon movement of the rod, and means for sliding the rod back to its initial position, the yoke adapted to move the rod out of engagement with the dog upon the backward movement, substantially as described.

9. A tack driving machine comprising a rod mounted to slide longitudinally and provided with shoulders upon its opposite faces, a yoke-shaped member embracing the rod, a continuously oscillated arm, a spring pressed dog mounted thereon, control mechanism operatively engaging the member and adapted to rotate the yoke-shaped member and move the rod into a position where the spring pressed dog will engage with one shoulder and slide the rod longitudinally, the yoke-shaped member acting to retain the rod in engagement with the dog durino the longitudinal movement, the opposite shoulder upon the rod adapted to engage with the yoke-shaped member at the end of the longitudinal movement of the rod, means ior sliding the rod back to its original position, the yoke-shaped member being carried with it out of operative engagement with the control mechanism and means for partially rotating the yoke-shaped member to move the rod out of the path of the spring pressed dog, substantially as described.

l0. A tack driving machine having, in combination, a spring-actuated tack driving plunger, continuously operated means for raising the plunger, means for holding the plunger in a raised position, power-actuated mechanism for releasing the holding means, control mechanism adapted to set the poweractuated mechanism into operation at the will of the operator, and independent means for rendering the power-actuated mechanism inoperative after the holding means has been released, substantially as described.

ll. A tack driving machine having, in combination, a spring-actuated tack driving plunger, continuously operated means for raising the plunger, means for holding the plunger in raised position, tripping mechanism for releasing the holding means, power-actuated mechanism normally disconnected from the tripping mechanism, means under the control of the operator for connecting the power-actuated mechanism to the tripping mechanism, and independent means for disconnecting the two mechanisms after the holding means has been released, substantially as described.

l2. A tack driving machine having, in combination, a spring-actuated tack driving plunger, continuously operated means for raising the plunger, means for holding the plunger in a raised position, a power-actuated arm, a rod normally disconnected from the arm and operatively connected with the holding means, and means under the control of the operator to connect the arm and rod whereby the rod is actuated to release the holding means, substantially as described.

13. A tack driving machine having, in combination, a spring-actuated tack driving plunger, continuously operated means for elevating the plunger, means for holding the plunger in an elevated position, and mechanism actuated 4in timed relation with the elevating means to release the holding means and allow the plunger to be depressed, the said mechanism being under the control ot' the operator, substantially as described.

14. A tack driving machine having, in combination, a spring-actuated tack driving plunger, continuously operated means for raising the plunger, means for holding the plunger in a raised position, power-actuated mechanism for releasing the holding means, and means for rendering t-he power-actuating mechanism inoperative after the holding means has been released, substantially as described.

FRED L. MACKENZM.

Nitnessesz CHESTER E. ROGERS, LAURA M. GooDRIDGE.

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

Washington, D. C.

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