US1875788A

US1875788A - Stroboscope

Info

Publication number: US1875788A
Application number: US543314A
Authority: US
Inventors: Philip C Wentworth; James H Avery
Original assignee: NAT RING TRAVELER CO
Current assignee: NAT RING TRAVELER CO; NATIONAL RING TRAVELER CO
Priority date: 1931-06-10
Filing date: 1931-06-10
Publication date: 1932-09-06
Anticipated expiration: 1949-09-06

Description

Patented Sept. 6, 1932 NITED STATES PATENT f OF FlC Ei PHILIP c. wEN'rwoR'rr onrnovInENcE; nnonn isnANn, AnnJAMEs VERY,- or FRANKLIN, massacnusnr'rs, Assrenons TO NATIONALRING'TRAVELER; co er PROVIDENCE, RHODE ISLAND, A cor ronnrroiv or R-rronn rsmmn srnonoscorn Application flled trune 10, 1931. Serial Ho. 543,314.

This invention relates to stroboscopes and is particularly adapted for use with such equipment as ring spinning and twisting equipment where the problem is to observe and intelligently analyze the many varying factors involved in order to. establish the proper relationship between the spindle, ring and traveler used in ring spinning and twisting yarn. These varying factors all have a definite bearing upon the ultimate result obtained and all have a definite relationship to each other and to the particular type of observation apparatus employed. The -exist ence of these factors has always beenknown, but on account of the lack of any reliable apparatus for positively observing their 'efiects under conditions of actual service, such effects could only be guessed at and any change or correction oflered as a remedy was aptto bemore theoretical than actually justified by positive observation.

For example, spindle speeds often vary,- even where the spindlesare driven from a common driving source, and the traveler lags with reference to the spindle speed; Such traveler laghas a definite bearing upon the proper functioning of the traveler, as does the weight of the traveler, the angle of'the thread.v relative to the axis of the spindle, the difference in tension during the rising and falling phases of the rail, and the'constantly increasing diameter of the thread being laid on the bobbin. These, and many other factors, all contribute towards variations in the the traveler are in proper relationship to each other. As previously'suggested, suchrelationship may be a matter of traveler speed-or,

spindle speed, or may be a combination of either of these. H'avingestablished by such; observation the particular factors involved for any given installation, the proper corrective'steps nextto be taken may then be acourately determined. When such corrective steps are made, the mill-owner may then obtain that efHciency of operation which has been so long desired inthe ring spinning and twisting art and which would be represented by the theoretically attained condition of a traveler freely floating on the ring.-

As illustrative of the principles of'our invention we show in the accompanyingdraw ing a form of'stroboscope operating upon the principle of periodic interruption of illumi nation. Such apparatus is illustrative rather than limiting, as the stroboscopic principle may be attained in various other manners.

1 In such drawing':'

Fig. 1 is a plan view of a stroboscope in accordance with our present invention, and f Fig. 2 is a side elevation thereof.

I Since oneof' the desiderata in a deviceo this character is that the apparatus shall be capable of'ready transportation to the spinning frame or' other object to be observed,-

we have-illustrateda portable stroboscope of light and compact form in this drawing. 7.

As such, our stroboscope comprises a base 1 on which is mounted a variable speed motor 2 which maybe belted as at3 throughchange speed pulleys l and 5 and-6 and 7 to a driven shaft 81 i 'The driven shaft is formed asa pair of alined sections flexibly connected as at 9. The two's'haft sections are mounted in suit

able bearings

10, 11 and 12; One shaft section, here indicated as the shaft section 13, is

VVhere the observation apparatus is mechanical' rather than electrical we may use the interference type of vision interrupter in place of the intermittently flashing projector, such interrupter being an apertured disc or the like for periodically interrupting vision of the part to be observed, the number of interruptions corresponding to the speed of the interrupter shaft.

The opposite section 8 of the sectional driven shaft has attached to its outer end a we provide means whereby the speed of the motor may be positively controlled by regulating the input-of operating current. Such a device is indicated, at 20 and consists of a variable resistance through which the current to the motor is passed. The resistance apparatus 20 is provided with a manually operable control knob'21 by means of whlch the input of the current to the motor may be manually regulated and with a push button 22 functioning as an accelerator by means of which the motor may be quickly speededup independently of the control knob 21 "in the event that the operator does not wish to take the time to attainthe desired speed by the slower method of increasing the input of the current by means of the control knob. j A Y I v In operation, the apparatus is positioned adjacent the spinning or twisting frame whiehis to be observed and the motor 2 and flash projector 16 are connect-ed up with the current source, preferably by-meansof independent switchcontrols.

The variable resistance 20 enables the input of current to the motor to be positively regulated and thus the speed of the motor brought up to the desired speed, which speed will approximate the speed of the spindle. to be observed. By manipulating the control knob 21 of such resistance 20, the motor may readily be maintained at the desired speed, the accelerator button 22 permitting the motor to be speeded up as needed.

. The rotation of the motor shaft is transmitted through belt 2 and chain speed pulleys, 4 or 5 and 6 or 7 to the driven shaft 8 with no appreciable loss of speed, and the speed of the driven shaft 8 and thus the flash frequency of the flash projector is visually indicated to the observer'by means of the tachometer 17 which is driven from shaft 8. Should for any reason it be desired to slow down the flash frequencyof the pro- -The estimated lag of the traveler is usually about'10%' of the required traveler speed. The tachometer furnishes a convenient means for determining the relative speed of the traveler and its percentage of lag may be approximately fixed by varying the speed of the motor through the extremely sensitive control afforded by 'the variable resistance 20. The traveler may be brought momentarily to aposition at which it appears to be substantially stationaryand may be held in such position sufficiently long to enable its position on the ringto bedefinitely observed. This is important in determiningwhether or not a traveler is too light-or too heavy for the particular grade of yarn being spun or twisted. If. the traveler is too light for the yarn being used or for. the particular speed at which the spindlev is being rotated, the traveler will appear to be thrown outwardly by centrifugal action. If too heavy, the traveler will tendto lag so much that it will appear t'obe drawn radially of the ring. In either case the result is to'produce an undesirable friction onithe ring at the horns of the traveler. Such friction is responsible for the lag of the-traveler. More than this, it produces destructive wear on thetraveler horns and, the expensive. traveler ringv and causes the yarn being spun or twisted to vary in diameter. I

'By our inventiontherefore we are able toanalyze the action of any spindle equipment which is not functioningproperly or which appears to be functioning properly but actually is" not, and as a result of our study to determine which of the several factors of spindle speed, traveler speed, traveler lag, traveler weight, angle ofthread relative to the a'xis'of the spindle, difference in tension between the rising and falling movements of rail, constantly increasing diameter of the thread being laid on the bobbin, may be involved and intelligently to prescribe the required corrective steps to be taken.

. Various modifications in the construction and operation of our device may obviously be resorted to if within the spirit and scope of our invention without departing from the limits of the appended claims lVhat We therefore claim and desire to secure by Letters Patent is 1. Stroboscopic apparatus for determining the necessary factors to establish the proper relationship between the; spindle, ring and traveler used in ring. spinning and twisting yarn, comprising a variable speedmoto'r, an

interrupter shaft driven from said motor at speeds regulatable to the varying speed of the spindle and traveler relative to each other, a variable resistance for controlling the input of current to said motor, an interrupter driven from said driven shaft a flash light manipulatable with reference to the part or parts to be observed and adapted to be periodically flashed by said interrupter in synchronism therewith for determining stroboscopically the speed of the spindle and traveler relative to each other so that the relation of the traveler to the ring may be observed with the stroboscope at the speed obtained, and a tachometer driven from said driven shaft for visually indicating the speed of said driven shaft.

2. Stroboscopic apparatus for determining the necessary factors to establish the proper relationship between the spindle, ring and traveler used in ring spinning and twisting yarn, comprising a variable speed motor, an interrupter shaft driven from said motor at speeds regula-table to the varying speed of the spindle and traveler relative to each other, a variable resistance for controlling the input of current to said motor, said resistance including a control knob by means of which the resistance to said motor may be manually regulated and an accelerator by means of which the motor may be instantly speeded up, an interrupter driven from said driven shaft a flash light manipulatable with reference to the part or parts to be observed and adapted to be periodically flashed by said interrupter in synchronism therewith for determining stroboscopically the speed of the spindle and traveler relative to each other so that the relation of the traveler to the ring may be observed with the stroboscope at the speed obtained and a tachometer driven from said driven shaft for visually indicating the speed of said driven shaft.

3. Stroboscopic apparatus for determining the necessary factors to establish the proper relationship between the spindle, ring and traveler used in ring spinning and twisting yarn, comprising a variable speed motor, an interrupter shaft driven from said motor at speeds regulatable to the varying speed of the spindle and traveler relative to each other, a variable resistance for controlling the input of current to said motor, an interrupter driven from said driven shaft a flash light manipulatable with reference to the part or parts to be observed and adapted to be periodically flashed by said interrupter in synchronism therewith for determining stroboscopically the speed of the spindle and traveler relative to each other so that the relation of the traveler to the ring may be observed with the stroboscope at the speed obtained.

4t. Stroboscopic apparatus for determining the necessary factors to establish the proper relationship between the spindle, ring and traveler used in ring spinning and twisting yarn, comprising a variable speed motor, an

interrupter shaft driven from said motor at speeds regulatable to the varying speed-of the spindle and traveler relative to each other, a variable resistance for controlling the input of current to said motor, said resistance including a control knob by means of which the resistance to said motor may be manually regulated and an accelerator by means of which the motor may be instantly speeded up, an interrupter driven from said driven shaft a flash light manipulatable with reference to the part or parts to be observed and adapted to be periodically flashed by said interrupter in synchronism therewith for determining stroboscopically the speed of the spindle and traveler relative to each other so that the relation of the traveler to the ring may be observed with the stroboscope at'the speed obtained, a tachometer driven from said driven shaft for visually indicating the speed of said driven shaft and a frictional retarding device for said driven shaft manuallyoperable to reduce the speed of said shaft.

In testimonywhereof we alfix our signatures.

PHILIP C. WENTWORTH. JAMES H. AVERY.