US2526726A

US2526726A - Speed control mechanism

Info

Publication number: US2526726A
Application number: US736720A
Authority: US
Inventors: Lawrence S Brown
Original assignee: Sperry Corp
Current assignee: Sperry Corp
Priority date: 1947-03-24
Filing date: 1947-03-24
Publication date: 1950-10-24
Anticipated expiration: 1967-10-24

Description

Oct. 24, 1950 I s, BROWN SPEED CONTROL MECHANISM 4 Sheets-Sheet 1 Filed March 24, 1947 UCL 24, 1950 Yl.. s. BROWN 2,526,726

v SPEED CONTROL MECHANISM Filed March 24, 1947 4 sheets-sheet 2 HIGH,

SPEED M01-0R' Rssmwlok '155 ELEG,v 15.5 Moms 154", PUMPS lA-l Y Low speso HIGHSPEED vALva 158 159 VALVE :1E-16o 1anz1b,hhlshl l l In! A 16 20o SPEED CONTROL INVENTOR Hl ATTORNEY Oct. Z4, 1950 s. BROWN SPEED CONTROL MECHANISM 4 ,Sheets-Sheet 3 Filed March 24, 1947 INVENTOR LAwRE caSRowN BY ms ATTORNEY Oct. 24', 1950 s. BROWN SPEED CONTROL MECHANISM 4 Sheets-Sheet 4 Filed March 24, 1947 lNvENToR LAwR /vcs BRow/v ms ATTOREY jatentec ct. 2:4,

2,526,726? sr'EnCoNTRoLfii/.IEH ANsM' Lawrence 8. Bron/nl, Long'v Island. City', N.z asf.- I' s'ignorto TheSperry Cclip'ratioii, a corporationl of Delaware ApplicatioMarcll 24', 1947, Serial No, 736172@ This `invention relates to driving means for y"paper'box machines orthe like having a plurality rofelements which are to be driven at different speeds having selected ratios, and as for an object to yprovide speed control mechanism having 3 Claims. (ol. 74-471) mea-ns for simultaneously varyingthe speeds of theV var-ious driven elements while maintaining l-thel selected speed ratios therebetween.

` Another object is to provide a mechanism .fof lthe above type including hydraulic driving means vrwith speed control mechanisms inter-related toV produce the aboveresults.

Another object is to provide driving means of the above type having a simple adjusting mechanism for adjusting the speed ratios to any desired value and for maintaining 'the selected ratio jthroughoutthe speed range'of the machine.

Various other objects ande-advantages will be apparent as the -nature of the invention is more Y fully disclosed. Y 'Theipresent invention is particularly applicable -'to a paper aboX folding and gluingrmaohine of the v"type shown in the Stande" PatentrNo. 2,349,204,

dated May 16, 1944. folding and gluing section including belt con- Y-ve'yors which feed the folded and glued blanks at vpredetermined rates and a stacking mechanism including a separate belt conveyor towhich the folded blanks are fed and stacked from the first "conveyor,

last conveyor through adrying zone wherein Vthe glue is` dried. The rate of feed of the stack con'- veyor belt is slower than that of the first conzveyor belt and is selected to provide the necessary drying time. The ratio between the speeds off the two belts results in stacking the folded -blanks on the slower conveyor belt with a certain overlap or shingling, the amount lof overlap being a function of the speed ratio of the tworbelts. This operation is shown-and described in conl-nection with-Fig. 2 of the above mentioned Staude patent and only so much 'thereof is shown in the present application as is necessary to an understanding of this invention.

A'Ill'ieriresent inventionprovides hydraulic driving'v motors for driving therespective conveyor belts and control valves for controlling the speeds 'of the individual mctors.` The control valves are actuated by van interlocked control mechanism which isadapted to maintain a selected speed ratio between the rates of travel of the two belts This machine includesl -a The stacked blanks are fed on the.

teristie of' this invention are pointed out more particularly in the claims, the nature' of they invention will be` better understood by referring t0 the following description taken. in connection withv the 'accompanying drawings in which 'a specic embodiment -thereofhas been set yforth for purposesof illustration.

In the draw-ings# Y y v Fig. y'1 is a longitudinal section through aI portion* of" the stacking "machine showing the two feed belts; .Y

Fig. 2 is 'a diagrammatic view showing the hy- Vdraulic drive mechanism and control valves;H 'i 3 is a lfront-elevation of the control mecha-` nis'm lon a larger scale; and ,1 .e

l' Figa is afsection-on the line 4`4 of Fig. 3a` l' vv'fl-lc'rrfan illustration of one type of mach-ineptov which" the present invention may be applied, 'reference is made tolFig. 1 which shows a portion .of the' folded'box blank feeding and `stacking 'ine'chanism illustrated in the Stande patent above ,.mention'ed.. In this figure' theV folded'. box .blanks .'liiiare shown as conveyed by a lower conveyor `belt 95= which is driven over a-'series `of idler.r .pulleys ySli by a drive pulley 91 mounted on a shaft'l.

`The :blanks I0 a'rerheld against fthe belt 35 by' an together/by pressure devices, including apresser belt :|04 'and a presser roller |05; for a-fsuicie'rit l period of time fory the glue'dparts toset. The stacker belt |02 is showin as driven byaidrivinvg rol-ler llvthro'ughbeveled gears from'a-dri've saar-tf l fz. 'f 'rae-belt fl 02 passes over an adjustable idler pulley v I3 'which is mounted for adjustment in 'a V'slotted bracket 44 which i-s\ pivoted to a 4bracket vf| |6"'by'a pin-|11 and isadjus'ta'ble bya'n arcuaterack ||8 on an' extension |f|19-l of the bracketl l'4.- `The rack ||8enga`ges an adjusting gear-^|20. The roller |0'5 is mounted on Ya pivoted bracket |2| and may be adjusted elevation'by arbracket |22 pivoted at `|23 and carrying -a segment rackv |24 engageclby `an adjusting gear |25 j'ou-rnaledin anxedfbrack'et |26. v VV-Tlfie adjusting rod |f|l| for the upper" belt 98 is secured in a1bracket. |30 pivoted at- |3| tora iixedxsupport |32.and carries Iat its Vupper. 'endf 'a rollerlll'33.` An idlerifroller |34 is mounted vconis mounted on an arm |31 attached to the rod I| and cooperates with the pulley 96 to apply Y pressure to the folded blanks l0.

The belt 95 is driven through beveled gears |40 from a drive shaft I4I. The shafts 13 and 13 are geared together for driving the

belts

95 and 98 in unison.

It is to be understood that the drive has been shown as applied to the pulleys 91 and ||0 merely for purposes of illustration. The drive may of course be applied to any selected belt pulley,

such as the pulley at the trailing end of theV belts so as to hold the top runs of the belts under tension. This invention is concerned with the means for applying power to the drive shafts ||2 and 14|. The driven elements may be variously located as desired.

It is noted that the blanks I0 are stacked on the belt |02 due to the difference in speeds of the belts 95- and |02 and the amount of overlap of -the various blanks in the stack |03 Will depend valves |58 and |59, respectively. The control valves |58 and |59 are actuated by shafts |60 and I6I, respectively, to supply uid at a variable rate through ducts |62 and |83, respectively, to'the motors |50 and |5I. Excess fluid is returned from the valves |58 and |59 through ducts v |64 and |65 to the reservoir |52. Fluid from the motors |50 and |5| is returned to the reservoir `|52 through pipes |66 and |61. The motors |50 'and I5I are of a type such that their speed of operation is dependent upon the volume of the lfluid supplied through the pipes |62 and |63. This in turn is controlled by the positions of the valves |58 and |59.

In the operation of the control linkage shown in Figs. 3 and 4 the handle I1| is set in accordance with the desired speed of the motor I5 I The cam |15 through the follower |16 and the linkage |8| swings the arm |83 about the pivot pin |84 a selected amount. Movement of the arm |83 through the cross head |96 and the pin 20| causes a parallel movement of the plate 85. The ratio of the movement of the plate to the movement of the arm |83 is determined by the position of the crossvhead |96 with respect to the slot |95. The cam 15 is so designed that the combined effect of the above described linkage is to shift the segment gear 2I| and shaft |12 by amounts to cause the motor |50 to operate at rates which bear a predetermined constant ratio to the rate of the motor |5| regardless of the position of the control handle |1I. This ratio is varied by varying the position of the cross head |96 which in turn is controlled by the adjusting knob 200 and may be registered by the pointer 205 onthe scale 206. I

Inasmuch as the overlap of the folded blanks in the stack |03 is determined by the speed ratio of the belts and |02, the scale 206 may be graduated to read directly in the amount of overlap.

After the overlap has been set on the scale 206 by the adjusting knob 200 the rate of feed of the conveyors may be varied by the control handle I'II. This will change the speeds of motors |50 and |5| as desired but will maintain the predetermined speed ratio and the predetermined overlap of the stacked blanks regardless of the conveyor speeds.

It may be desirable to stop the motor |5| orto operate this motor at a comparatively low speed for selected periods of time. At the same time it may be undesirable to stop the drive of the conveyor belt |02 completely as this would leave the stack |03 in the drying oven or other apparatus to which they are fed thereby. In order'to prevent the belt |02 from being driven at a speed below a predetermined minimum speed the hook 2I5 may be placed over the stud 2I6. The apparatus will then be operated in the above described manner until the pointer |13 reaches a position such that the end of the hook 2|5 engages the stud 2|6. When this occurs further movement of the pointer |13 and its associated shaft |12 is prevented. If the handle I1I is moved to the left beyond the positionat which the hook 2|5 engages the stud 2|6, the follower |16 is prevented from following the cam |15 and is held disengaged by the hook 2|5. Hence the motor |5I may be slowed down to any predetermined speed or may be stopped Without stopping the motor |50 completely. Under this condition the stack |03 may be run out of the machine after which the motor |50 may be stopped by disengaging the hook 2 I5 and allowing the pointer |13 and the shaft |12 to move to the extreme left position under the influence of the spring |18. Y

It will be` noted that by means of the present invention the relative drive speeds of thetw'ormotors may be controlled simultaneously or selectively as desired and that any desired speed ratios may be maintained regardless of variations in the actual speeds of the two motors.

While the invention has been shown as applied to a particular type of box blank folding and stacking machine, it is to be understood that the control mechanism may be applied to any type of machine wherein two elements are to be driven under the relative conditions above mentioned and the invention is not to be restricted to the particular type of machine which has been indicated for purposes of illustration. Various changes and adaptations andfurther applications of the invention'will be readily apparent to a person skilled in the art. The invention is only to be restricted in accordance with the scope of the following claims.

What is claimed is:

l. A mechanism for controlling the respective speeds of a pair of driven members having individual speed control elements, comprising a positioning means for each element, a settable member connected to control one of said positioning means, a linkage actuated by said settable member to set the other of said positioning means, said linkage including a cam member shaped to relatively position said speed control,

elements so as to maintain a constant speed ratio between said driven members for all settings of said settable member, a cam follower engaging said cam member, a pivoted arm actuated by said cam follower, a laterally shiftable member connected to actuate the other of said positioning members, means `connecting said pivoted arm to actuate said laterally shiftable member with a parallel motion, and adjusting means connected to shift said connecting means with respect to the pivot point of said pivoted arm for varying said speed ratio.

2. A mechanism for controlling the respective speeds of a pair of driven members having individual speed control elements, comprising a positioning means for eachelement, a settable member connected to control one of said positioning means, a linkage actuated by said settable member to set the other of said positioning means, said linkage including a cam member shaped to relatively position said speed control elements so asto maintain a constant speed ratio between said driven members for all settings of said settable member, a cam follower engaging said cam member, a pivoted arm actuated by said cam follower, a member mounted for parallel movement, pivot means connecting said arm to shift said last member, and a link actuated by said last member to set said otherV positioning means.

3. A mechanism for controlling the respective speeds of a pair of ,driven members having individual speed control elements, comprising a positioning means for each element, a settable mem.- ber connected to control one of said positioning means, `a linkage actuated by said settable member to set the other of Said positioning means, said linkage including a cam member shaped to relatively position said speed control elements so as to maintain a constant speed ratio between said driven members for all settings of said settable member, a cam follower engaging said cam member, a pivoted arm actuated by said cam follower, a member mounted for parallel movement,

pvot means connecting said arm to shift said last member, a link actuated by said last member vto set said other positioning means, and means adjusting the position of said pivot means along said arm to Vary said speed ratio. i

' LAWRENCE S. BROWN.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES ini'rrlri'rs Hoffman et al June 25, 1940