USRE454E - Improvement in looms - Google Patents

Description

UNITED STATES PATENT OFFICE,

WARREN w; DUrcHEa, or MiLFoRD, MAssAci-iusnrrs.

IMPROVEMENT IN LOONIS.

l Spcrileat ion forming part of' Letters Patent No. 4,1106, dated .lune 27, 1856; R4 isslnl No. 154, dated April 21, 1357.

To all whom, it may concer/L.-

Be it known that I, WARREN W. DUTCHER, late of Bennington, iu the county of Bennington and State of Vermont, but now of Milford, in the State of `Massachusetts, have invented a new and useful Improvementin Looms; and

-ployed of driving the shuttle is by means of pickers that slide on rods attached tothe shuttlc-boxes, and driven by staffs connected with them by means of the leather cords. An at tempt has been made to improve this by some, consisting in dispensing with the pickers and driving the shuttle by the ends of the staffs.

To avoid thc difficulty arising 'from the fact that the end of the staff which strikes the sh uttle describes a circle in its vibration, each staff, instead of being made to turn on a joint at its lower end, is provided with a rocker to rock on a platlbrm, the curve of the rocker being such asto make that cud of the staff which strikes the shuttle move in a line parallel with the race-board.

In order to keep the rockers on the plat form, links jointed to the rockers and to the platforms have been employed. These, however, are objectionable1 as they necessarily cause the rockers to slide on the platforms, and do not cifectually keep them thereon. This obvious defect I avoid by my improvement,

which consists in connecting cach drivingstaff with the shuttle box by means of a jointlink jointed to the shuttle-box and to the staff about the middle of the length of the latter, which at its lower part is made to rest against a roller, and in such manner as to admit of the staff being moved up and down or longitudinally, the roller answering the purpose ot' af I'ulcrum for the staff to rest against, which being drawn backward by means of a strap attached to a spring and to the end of the staff below the roller. The lower end of the two staffs are respectively connected to the prongs of a bifurcated spring, the tension of which is so regulated that when one staff is thrown back the spring shall have strength enough only to carry bacl the other staff about half-way, where it should remain until the sh uttle is next driven back, and distends the spring and causes the statt' to move back with the shuttle.

In the accompanying drawing, B represents the race-board; C C, the lay-swords, and H the cross-bar connecting them `in the usual manner.

A A are the driving or Wag staifs, the upper parts of which pass through 'and move freely in slots made through the bottoms of the shuttle -boxes That part of each stati' which is intended :for striking the shuttle should be armed with some appropriate elastic material, as seen at Il. Toward thelowcr cud of each staff such statil plays between the y prongs of a forked arm or bracket, F, and rests against a roller, fi, so as to admit of the staff playing up and down freely d uring its vibrations or lateral movements. Each of these staffs is connected with its shuttlebox by a joint-link, D, jointed both to the shuttle-box E and to the stail, so that as the upper end of the staff vibrates .it may be kept in a line parallel with the race-board, and hence in the l line ofthe motion of the shuttle. The lower ends of these staffs are connected, respect ively, by cords c e with the prongs of a forked spring, G, the tension of which tends to draw the upper ends of the stalls away from each other.

The staffs by any of the known means can be operated so as to drive the` shuttle across the race-beam. For this purpose each may have a strap, K, attached toit and to atreadle or lever, the strap being passed overa roller, M. Any other convenient mode of accomplishing the same may be substituted, if dc sirable. rlhe interposed spring G- should turn freely ou a pin or fulerum at le, so as to act with equal force ou each of the twostalis in any position in which they may be placed. Vhen they are both thrown back, as represented in the drawing, the spring is not under tension, and if one ofthe staffs is placed in a vertical position, as indicated by dotted lines, the tension should not be suicient to carry it back; but asl the other sta is moved toward it in driving the shuttle the tension ofthe spring is increased, and then moves it back as the shuttle approaches it. This gradually arrests the momentum of the shuttle and avoids much of the jar which otherwise would take place.

It will be obvious from the foregoing that any kind of spring which will operate in like manner may be substituted for the one represented in the drawing.

.I do not claim guiding awag-staff by means of a rocker and stand7 my invention not employing any rocker or rocking motion for each` Wag-staff.

W'hat I do claim is a positive motion above forrdriving the shutltle,whereby the returning-staff aids in arresting the momentum of the shuttle7 substantially as herein described.

' VARREN XV. DUTCHER.

Witnesses:

GEO. G. PARKER, T. B. THAYER.

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