US594811A - Fastening-driving machine - Google Patents

Description

(No Model.)

W. SHAW.

FASTENING DRIVING MAGHINEI 1 I0.594,'811. Patented Nov. 30, 18.97

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UNITED STATES PAT NT OFFICE.

WVALTER SHAW, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE CON- TINENTAL LASTING MACHINE COMPANY, OF MAINE.

FASTENING-DRIVING MACHINE.

SPECIFICATION forming part of Letters Patent No. 594,811, dated November 30, 1897. Application filed January 18, 1897. Serial No. 619,544. (No model.)

T at whom it may concern.-

Be it known that I, WALTER SHAW, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Fastening-Driving Machine, of which the following is a specification, reference being had to the accompanying drawings, in WhlCll- Figure 1 is an elevation showing the main portions of one form of my machine. Fig. 2 is a detail fully described below.

My invention is a machine made up of a mechanism for driving tacks or other fastenings, a work-support or jack, and a mechane ism which automatically actuates the jack while the fastening is being driven, but is disconnected from the jack for the interval of time between the driving of successive fastenings.

In the drawings, A is a tack-driving mech-:

anism, B its jack or work-support, and D a mechanism for pressing the jack into place when a tack is driven, and while these mechanisms may be of any suitable construction I prefer the forms shown, which are fully described in patent to Erastus Woodward, No. 473,136, dated April 19, 1892, in which the driver-bar of the tack-driving mechanism runs continuously, but a tack is driven only when the shaft f is partially rotated by the operator, and the jack-operating mechanism requires to be started by the operator.

As the motion of shaft f determines when a tack is driven, I use cam (1, fast to shaft f to control the jack-presenting mechanism,

for cam 01 engages roll d, whose stud is fast to yoke CF, and the depression of yoke 01 causes lever (Z to pull on rod 01 which through arm 61 turns rock-shaft (Z and clutches shaft (1 to pulley d and thereby causes gear d to revolve sufficiently to move segmental lever 01 far enough to press jack B to place to receive a tack. Pulley d is belted to pulley a and pulley a is fast to shaft a, but pulley d is loose on shaft (1 except when attached thereto by the operation of cam (Z.

- When the driving-belt is shifted from the loose pulley P to the fast pulley P, the pawl f is reciprocated, and whenever it engages its ratchet f the jack-presenting mechanism presses the jack to place and a tack is driven almost instantly, although worm-gear a moves so slowly that only one hundred and fifty tacks are fed and driven per minute when the driver-shaft a runs at twelve hundred per minute, worm-gear a having forty-eight teeth and six tappets a so that lever a carrying pawl f, makes only one full stroke to eight revolutions of shaft a. The rapid reciprocations of the driver-bar, while seven out of eight are idle, are yet desirable, for it is of course practically essential that the driver-bar shall be thrown down with great rapidity, as otherwise it would press the tack into place instead of driving it by a blow.

Cam cl actuates the jack at the rate of two and ahalf times per second, but occupies only a small fraction of a second in clutching and unclutching shaft d and pulley (1 so that a large fraction of the Whole time (in that example of my machine shown in the drawings) is left for-the operator to manipulate the work and the jack; and this is the characteristic feature of my invention, the almost instantaneous and simultaneous'operation of the mechanisms for driving the tack and pressing the jack into place with intervals between successive operations of these mechanisms determined by the controlling mechanism.

In order that pawl f may beunder the control of the operator, I use a pawl-shield f which is one arm of a bell-crank lever, the

other arm of that lever being connected by rod f to the long arm of lever t,which is actuated by treadle-lever T.

All these details of construction will be plain from the drawings, and all the other details of construction not herein described will be well understood by all skilled in the art, especially on reference to the Woodward patent above mentioned; and, moreover, my

invention does not reside at all in these matters of detail, but, as will now be clear, is a machine in which the operation of pressing the jack to place and driving a tack is automatic and almost instantaneous, but withintervals determined by the mechanism which controls the relations of tack-driving mechanism and the jack-presenting mechanism.

I have shown my machine as a combined tacking and lasting machine, for the reason that that is the class of work for which it is more especially applicable, although obviously it is not limited to that class of work.

In lastingthe operation is as follows: The laster first shifts the belt from the loose pulley P to the fast pulley P',and thereby starts the machine, which runs continuously, but is nevertheless idle until the pawl-shield f is withdrawn. After the laster has pulled. one part of the upper into place he holds it and depresses the treadle T to withdraw pawlshield f whereupon the jack is pressed to place and a tack is driven. He may then let up on the treadle andtake his time to pull a11- other part of the upper into place before he repeats the operation as first described; but it is essential during the operation of lasting that he be able to drive several tacks in succession, and to do that he holds the pawlshield retracted long enough to get as many tacks as he wants, moving the jack While it is not under the control of the jack-operating mechanism, so that the jack and the last and the shoe carried by it will be pressed to place for each tack as it is driven. The jack is counterpoised by aspring S,which is adjusted to suit the operator, and most operators so adjust spring S that the up-and-down motion of the jack is slight, usually less than half an inch, for during the intervals between successive operations of the tack-driving and jack-operating mechanisms the jack is under the control of the laster, aided by the stress of spring S.

The main advantage of my machine is that it enables the operator to do more work. \Vhile some lasters want more and some less time between tacks, yet it is essential that the jack be pressed to place and the tack be driven as near instantly as possible, and Ihave found in practice that if the machine be timed for about twelve hundred operations per minute, or twenty per second, and the pawl f be reciprocated one hundred and fifty times per minute, even the most expert lasters are not annoyed by the wait between operations, while the ordinary laster has sufficient time between operations to manipulate the jack and the work; but some lasters can last with a shorter wait, while a few desire a longer wait, and in other work than lasting the Wait will of course depend upon the time required for manipulation between operations, this being obviously a matter to be determined by circumstances, for my invention is a continuously-operating machine automatically controlled as to the intervals between operations, each operation of driving a tack and press ing the jack into place being almost instantaneous, but the time between operations depending upon the timing of the controlling mechanism by which the jack and its operating mechanism and the tack-driving mechanism are caused to constitute one machine.

It will be obvious that a great variety of mechanisms will embody my invention, and I have contemplated several other forms; but I prefer the form shown, for the reason that the shaft a runs continuously and is therefore a convenient means for driving the tappets or cams a carried by worm-gear a and those tappets can be readily varied in number to vary the length of the intervals between successive operations 'of the jack-operating mechanism, and except for this only one tappet would be needed on worm-gear a but in that case that gear would make only one revolution to about eight of shaft a and rod d would be connected directly with lever a", for the action of a single tappet a on gear a if it made one revolution to only six or eight of shaft a, would be almost as speedy as is ,the action of cam cl with six tappets a on gear a and with one revolution of gear a to forty-eight of shaft (1.

What I claim as my invention is- 1. A machine comprising a fastening-driving mechanism; a jack; mechanism for presenting the jack and mechanism to automatically connect and disconnect the jack-presenting mechanism and its driving-shaft to cause the jack to be presented to the fastening-driving mechanism when the fasteningdriving mechanism drives a fastening, substantially as described.

2. In combination,a fastening-driving mechanism; a jack; mechanism for presentingthe jack; automatic mechanism to connect and disconnect the jack-presenting mechanism and its driving-shaft and means whereby the operator can control the operation of the automatic mechanism.

WALTER SHAXV.

Witnesses:

HERBERT W. DAMON, G. R. WHITMAN.

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