US2478957A

US2478957A - Feed control for gang saws

Info

Publication number: US2478957A
Application number: US756124A
Authority: US
Inventors: Wegner Julius
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-06-21
Filing date: 1947-06-21
Publication date: 1949-08-16
Anticipated expiration: 1966-08-16

Description

Aug. 16, 1949.

J- WE GNER FEED CONTROL FOR GANG SAWS 3 Sheets-Sheet 1 Filed June 21, 1947 s r INVEIVT-VR.

J. WEGNER FEED CONTROL FOR GANG saws Aug. 16, 1949;

Filed June 21, 1947 mrvzkraz.

' Aug. 16, 1949. J. WEGNER 2,478,957

FEED CONTROL FOR GANG SAWS Filed June 21, 1947 v 3 Sheets-Shee t 5 F1 55 A; L z 56' INVENTOR.

Patented Aug. 16, 1949 I 2,478,957 n FEED CONTROL FOB. GANG saws Julius Wagner, Flushing, N. Y.

Application June 21, 1947. Serial No. 156,124

14 fllaims. (Cl. 125-16) This invention reiatesbroadly to stone sawing I or cut-ting machines and more particularly to feeding mechanism for intermittently lowering or feeding the saw blades into the stone'to be out. i

The structure of these sawing machines, 1 called gang saws in the trade, usually consists ofa frame, which carries a sash in which any number of saw blades from a few to a .few hundred may be mounted. The sashirame may be operated in a number of difierent ways. as. for instance, by. means of amnk shaft and a connecting-rod. 1

For the purpose oicutting through a stone slab, the frame, carrying the saw blades,

is successively iowercd. .Heretndore, .the lowering of the sash frameor the feeding of the saw blades into the stone. has been accomplished either-by a separate driwe whicn 'operatedth-e ie'eding screws of the sash frame, or the reed ing mechanism has been interconnected with the main drive ofthe machine, such as the crank shaft, thus operating the feeding screws intenmittently by means of gear trains, ratchets, or arrangements. The drawback oi'the latter arrangement has been that the of the :rate or feed has been .very cumbersome and necessitated either shutting down thesegang saws altogether, which-besides an inevitable loss of time, was likely to result 'inan uneven out through the stone slab; or the operator had to climb up to the top the gang saworder to readjustthe feed,=wh-ic'n is an inconvenient as well as a dangerous task. Actuating the sash feed by means of gearing, ratchets, and the like, of course, limits the rate of iced to certain multiples of a given ieed. (Lonsequentiy, the

feed can be adjusted in infinite steps from minimum to maximum while the saw in operation and from the regular working position of operator would never adjust the most emcien-t feeding rate, and to prevent jamming the saw blades and doing other damage with too rapid a feeding rate, the operator has a natu-ral'tendency to set the feeder the sash' frame at-u. slow enough rate ate obviate 'these calamities under anyand all circumstances.

The need has been alt in the trade for many years for .a sash frame-feed which could (1) be adiusliedby the operator-with convenience and without :danger while the saw tsin operation,

ing mechanism depicted in Fig. 1 and part of the V gang'saw proper.

, F g. 3*is a, fragmentary view in front elevation, illustrating a modification of the sash feed. Fig. shows the one-way clutches employed in the-novel 'sashieed to a larger scale. a

Fig. 5 is an enilarged fragmentary detail View in front elevation of sash frame adfiusting screws,

such-as may be employed on each one of the four eorners of as'tandard gang saw. g I

Fig.6 is-an enlarged sectional view of the feed control box mounted on the crank shaft.

Fi'gi'"? Shows a View along line 'I-1 of Fig. =6.

Fig. 8 shows a modi-fication of the feed control iii-neutral position.

Fig, 9 -=fliustrates the position of the device shown'in Fig.- 8 while'the "feeding" rate is being decreased by reducing the eccentricity or crank "threw. j

Fi'gilG depicts "the tower part of the slide of the modified feed control;

'Figsfl'i and 12 show the split clamping ring;

in greater detail.

g Gaina rsaw'pmper 7 Referring to the general assembly shown in Figs. 1 and 2 of the drawings, the gang saw proper is illustrated snore or less diagrammatically bocause it wili be understood that the improved sas-iizfeeding mechanism may -be used andadaoted to any type of gang saw. The main frame of the gang saw is formed by vertical beams or columns ldpinterconnected by cross beams 1'2. Asash name-or sash 13 of any conventional de sign mountedin said main frame or main structure and may be horizontally guided by slides I4. Sash '13 may oe reiprccated by any suitable means, such as connecting i9, pivotaily'semired tosash frame 43 and actuated by means of crankshaft '20, as shown. Crankshaft 30 carries flywheels 2 and 21A, which latter is their upper ends bevel gears I! in mesh with.

bevel gears WA on shafts [8, All spindles [6 are driven in synchronism by means of said bevel HA and additional bevel gears ll,

gears I 112,. when shaft I8 is rotated.

The gang saw, as briefly described above, is of altogether conventional design and does not form part of the present invention.

Sash frame. feed Feed control box 22, which is equivalent to an instantaneously adjustablecrank, may be mount.- ed at one end of crankshaft 26. A connecting rod 23 is provided to transmit the oscillatingmotion created by feed control box 22 to a crank arm24, fast to an intermediate shaft 25, which may be mounted in bearings '26 and 27, supported either on the structure of the gang saw itself or on some auxiliary structure 28, formed b timbers or the like (Figs. 1, 2). A double crank arm 29, mounted in between

bearings

26 and 21, is fastened to intermediate shaft 25, so that any oscillating movement of connecting rod 23 and crank arm24, respectively, is transmitted to double crank arm 29. A bottom bar 30 and a top bar 3| transmit theoscillation of double crank 29 to cranks, 32 and 33, respectively, which are secured to oneway clutches '31 and 38, respectively, mounted on clutch shaft 34, which is journalled in bearings 35 and 36, respectively, supported by the machine proper or by the auxiliary structure 28. Clutch shaft 34 also carries pinion 39, in mesh with gear 40 on main feed shaft 4|. The latter is journalled in bearings 42 and 43. Gear 40, Whose hub 44 may form one half of a jaw clutch, is freely rotate able on shaft 4 l to which complementar clutchhalf 45 is slidably keyed, so that member. 45 may be brought into and out of engagement with clutch-half 44 by means of a hand lever or other suitable arrangement (not shown). Shaft 4! also carries fast and loose pulleys 46 and 41. These pulleys are arranged for rapid adjustment of the sash frame l3 in a vertical direction. A separate drive is generally used for this purpose, such as an electric motor with belt driving said pulleys 45 and 41. When employing this rapid feed, jaw-clutch 4445 is in disengaged position (as shown in Fig. 2), thereby rendering the work feed from feed control box 22 inoperative. The rotation of shaft 4|, whether caused by. feed C011: trol box 22 or by said rapid height adjustment, is transmitted to the several shafts [8 of the machine proper by means of gear 48, fast to shaft 4|, and pinion 49, fast to one-of the feed shafts l8, as shown. As previously described, the sash frame I3 is thereby evenly lifted or. lowered by means of vertical spindles l6. When the rapid height adjustment is not to be used, the beltis shifted to the loose pulley, thereby rendering this auxiliary rapid feed means inoperative.

It is pointed out, that the previously mentioned one-way clutches 3! and 38 are of conventional design and can only impart clockwise rotation to shaft 34. v Hence when crank arm 29 moves in a clockwise direction, clutch 38 will turn shaft 34 clockwise, while clutch 31, being simultaneously rotated counter-clockwise, is free-wheeling, and vice versa. It will be seen, therefore, that the feed screws l6 of the gang saw are operated durin the forward stroke of the sash frame l3 as well as on its back stroke, thus imparting to the saws in sash frame (3 two downward feeding cycles for each reciprocating cycle of the sash frame I3. This double feed has proven ver advantageous in cutting certain stones and has increased the cutting rate very appreciably.

If it is desired to impart to the sash frame only one feeding movement for each of its reciprocating cycles, bar 30 may be connected to a fixed point on the structure, as shown in Fig. 3. Thus one-way clutch 37 is rendered inoperative as regards imparting rotation to shaft 34 but will act as a brake to prevent any torsional springback of shaft 34, which might otherwise be caused by the elastic deformation in the various links of the feeding mechanism. It should also be observed that the free-wheeling clutch will act similarly during the double feed cycle. In other words, this design positively eliminates any undesirable torsional springback for the single as well as the double feed cycle; Feedinginaccuracies, such as found in conventional feed mechanisms, are done away with.

' Feed control boo:

Feed control box 22, shown in Figs. 6 and '7, is adapted to be conveniently adjustable to produce any desired eccentricity from zero to maximum, while the gang saw is in operation.

The feed control mechanism is mounted in a housing 50, from which a suitable hub 5| extends for mounting on crank shaft 20 by means of set screws52 or other suitable means. A hand wheel 53 is keyed and pinned to adjusting spindle 54, which is rotatably mounted in front in the hub-like projection 56 of slide 55 and is journalled in the rearlin bracket 51A, suitably fastened to slide '55 by means of bolts or the-like, asshown. Bevel gears 57 and 58 are fixedly mounted in spaced-apart relationship on spindle 54. In slide 55 a threaded adjusting screw 59 is journalled, which carries on its right-hand end bevel gear 60, located substantially centrally between. bevel gears 51, and 58 when adjusting spindle 54 is in neutral position, as shown in Figs. 6 and 7. Screw 59 is in threaded engagement with wall SI of the fixed inside structure 62, which consists of said transverse wall BI and left and

right members

63 and 64, respectively. This inside structure 62 is fixedly mounted with respect to the housing 50 and may be welded to the latter, as shown, or fastened to it by other suitable means. Slide 55 is provided at its front with shoulders 65,, which guide feed slide 55 on corresponding shoulders 66 of

sides

63 and 64 of inside structure 62.

The rear end 61 of spindle 54 extends into an elongated slot 68 of housing 50. In the neutral position of the feed control, which term will be more fully explained later, the end 61 of spindle 54 rests against the left-hand end of slotBB (Fig. 6), thus providing a definite stop for spindle 54 towards the left. When spindle 54 is in its extreme right-hand position, further travel in this direction will be limited by the end 61 of spindle 54 coming in contact with the right-hand end of said elongated slot 68.

Slide 55 carries on its hub-like projection 56 a flanged, circular disc 69, whose shoulders 12 are adapted to slide on shoulders 10 and 'H of left and right-

hand members

63 and 64, as shown,

game

M of dke' 611s aflaptw twrecemme right-W afiee'n 2-3; is me m oseillete said hub Y it; re keep the connecting rod eneiin pliee wwasherlk is me was may beiocatecii aeaiiistxhub lci'by mans Iockwheeil threaded ell-- hub: 5&3 siicie It isi'pointed out threzd en end; nubxii iez-a meme tmreaad, the erankshaftw um smrevawes insciockwise eh'ectim esimiieated in 5 same theresstimefi'the crankshaft win-hue tendeneytoi-tighten ieekring: 155; It timbeneted that, by tightening lock nugfli shde whole feecieoiismi: mechanism will-Abe bake-xi piece,- se that. the eecentri'city: oh disc as cannot or change; onee ioeb fiehtened.

\ o' Feed adafushnent.

Fig. 6 shows the feed control mechanisrmimmu talmesitiqm-that- Z-iS; imselismnent eenteriinenfierankehattt it; Feed uhthemferei; is; concentric-with the exams- 31281155 liwithi chm that: connecting: mazes hence: thefeedi tes the gang; aerm The hand: wheeiizfli-fwill of MUSE; revolve; if: net inhettfemd; with,.,. as lung: as cream-shaft ems reed/hinge; (ixmsequentlyg szpimiie ab veleeam; 51; and; 5% Wili i also; remive; m homer; i1: engagement with the bevel, seem in; e Spindle 5t pmvided with annuianigmemz 1 67: and; slide SSmar-riesra for theyositiveiaeatinn oi spindleufleinx its neutral? Ifi-it iS-"dfiSiiEd to increase the feed and, consequently, the stneim otthemarmeetingmd Himmseermte same larger alu w ile crankshaft m is mam with: feed control; 130x1 22; lock eingflids leusen'ed' amishand wisiixeei'v 531-: messed inwards hem; stationary; thereby; -ge arse 53 and-518;: to-revoive screw 5&5 Thisisesew beiiigrigh-tehandianwbeine imthe stationary: structure it; will; cause-.- thei-slideifi Y he: mwddi to; the. rightg thus bringing spindle EAiianci-stmke'JdisuGQ imam eeeentric. .yositien'with-xegardn te'eranieshait; 2 0. W hemthe: ,desired: eeeentricitm is hand ;53.- ---is, ;puHed -eut; intos'neutral ,pusitiom ta. disengage -beveli gems; 51: and i and; the: mecha anismis-iwke .egeim meaes an leek; ring. 35; uersm tmdeerease; the head -hand 53 is puiieitewand the fzcentx aitenhvloosening leek Iine- 4 b m fi s afidi illmnemmught mm engegementeherebm meei singi the.- notation (ii-the, adiusting ,screm-iS-end;mnvingi'the shde55 fiowends the; Whemthe dashed weentmicitm (and; hence memorie -pending: stroke oi, eanneetingmean is; ettainedifipindie; Mei-is pushemi; into, neutral position; again; so that the,

geers .axe: not-in mesh; and) lemming; FPS-is locked; Asepreviousiy. painted ,out theimaximum; wave! of screw 59. and; slide: 55" is: limited: by the elongated slot 68, giving; zemweecentrieity whenzqshaft. 1 rests; against the kit-hand wallbandl maximum ieceentricitm when said. shaft; endfi'heomes ineontaet with-.flie; ri ghmm wail efslot. 63;. j V Whilejbeyelgeaxs ili iaendfii haveheensheive in thishpreferredyemhodimen ti. ofmy; invention,- itQwilIjbe understood othenty e; 01h drive te actuateadius'ting screw Steould heempieyed; as, for instaneeheonieahinietiom discsor. simii-an devices I v 'While. :no. scales for; aseertainingv the amount of Ii-i63 ;ai f il is'tecijiiyi meansuoi. 't'he feeieontml. been 22 have been shown drawings ih is,,., eh

F188; 'i md i aa-ieit immi fireside-d? Inching. ring lil'andzwashez' w mvshown taioekrthe adjusted; and!) show members; Item: ii replaced? minn'eir meme; outer together mma -V shapes, as shemsmopeeetihg with: the inelin'emsaefw msplits ring 1 1 we E2); emehhale o! with Tha it ossesses; emsliifing fit 'oni 8 nimg-ie isrinl tin-headed? engagementw-ifle euwofisaie huh 5imar-my leekezhw'ihe. mew oi s: set sceew I2 ari'diiewtfi Te meiiitate assembly oi split riiig: wmay'besiotted and: saim siets egiimey mm as ziter'assembiy wieevee seams fit for pins 8| (Fig. 10). The wedge angles eii' ringsfli and aim riiig U are seieetked "as te cl-earaiiee between aejseene strings: 1: indie when assembiedi Fig. e shows spindle inineutrai and ioeiied pesftiem M this position sheen (1e pins" 8 I resii agai nst fifii dimeteroi s iihdieflm" Bum infi'en-ti and bzefi'ef this 'positieh however; the diameter *0? siaiiidiei? isredutied distehce', as shewn 8* 53312139? 'H-enee; wheh -hand wheeii's qaulieif -eh as i'i-Fig1fi; lt therfez efstih' fizrthefsirfiphfies chahging the adiustinent ef ehe=-r-eeeizi-g*ratewhiie the gang saw is in opet'tiohyfeed mount'eci ditetly (in-the emii'fei iii-leeravrfl zshz'iit 2 0 of the iiieiif drfvei is that this-*is nofianessefltiai" part n: my invention, as thefeed box mar-be mounted uh any synehronouslyrotiatingmemb'er of 'a' machine and? the linkage mechai'n ism ehanged accordihig'isfi v :edvamages of my inflh'it'eiyvari-ablesingle andidwble feefl havebemshowrr in connectidii wmi a gang sew-fer parting br"sawihg"stbn,"b1iii it 'wiii' he understddd' 'that' this same' device also be 'used" in eonneetion= withother equipmen neq'liifingmfi simfl'ar feeflfiwhiehis adiust'ame whee hropetafifim l While I have shown andfiesefibeihyfiafof examp'ieemeehemsmforiatt'aihihg "the-stated -01: insets, wish to: haveit understood that varieiis changes mnmodifieatiens may-"he memi'e wifiiiii v the scope: of; the claims hereto attached without meamefirm" said: sash 'reli'rhi i e:

Smetruetume, teed: b13588 the stone block, two one-way clutch mechanisms for. alternately actuating said sash adjusting means, and feed-control meansoperatively .connected with said-two one-way. clutch mechanisms, said feed control means having adjustable stroke means .associatd therewith for changing the rate of. feed. a

2. In a machine for parting stone blocks and the like, a multiplicity of saw blades, 2. sash for mounting said blades, a structure to suspend saidsash, means for actuating .said sash relative to said structure, adjusting means for lowering said sash to feedsaid saw blades progressively into the stone block, two one-way clutch'mechanisms for alternately actuating said sash adjusting means, and feed control means operae tively connected with said two one-way clutch mechanisms, said feed control means having ad-'- justable stroke means associated therewith for changing the rate of feed while the machine is in operation, and locking means for locking said adjustable stroke means in its adjusted position. f:

3; In a machine of the character described, 'a multiplicity of saw blades, a sash for mounting said blades, a structure to suspend said sash, means for reciprocating said sash relative to said structure, means for adjusting said sash vertically, to feed said saw blades progressively into the work material, two one-way clutch mechanisms for alternately actuating said sash adjusting means in synchronism with the reciprocating movement of the sash, said one-way clutch 'mechanisms being adapted to alternately lock said sash adjusting means against torsonal spring-back during part of their operating cycle, feed control means operatively connected with said two one-way clutch mechanisms, said feed control means having adjustable stroke control means associated therewith for changing therate of feed.

4. In a gang saw for parting stone blocks and the like, a sash, means for reciprocating said sash, further means for adjusting said sash in vertical direction, two one-way clutch mechanisms for actuating said adjusting means, and a feed control device adapted to actuatesaid two oneway clutches in synchronismwith the reciprocating movement of said sash. a

5. In a gang saw for parting stone blocks and the like, .a sash, means for reciprocating said sash, further means for adjusting said sash in vertical direction, two one-way clutch mechanisms operatively connected with said sash adjusting means, a feed control device-for actuating said two one-way clutch mechanisms in synchronis'm with the reciprocating movement of said sash, one of said one-way clutch mechanisms being adapted to actuate .said adjusting means during the forward swingof the sash and the other one-way clutch mechanism being adapted to actuate said adjusting means during the return swing of said sash.

6. In a gang saw for parting stone blocks and thelike, a sash, means for reciprocating said sash, further means for adjusting said sash in vertical direction, two one-way clutch mechanisms operatively connected with said sash adjusting means, a feed control device for actuating said two one-way clutch mechanisms in synchronism with the reciprocating movement of said sash, .Said one-way clutch mechanisms being adapted to actuate. said sash adjusting means alternately during the forward and return swings of said sash and to lock said sash adjusting means against torsional spring-back during. the re-@ maind'er of their respective operating cycles.

7.111 a machine of the characterdescribed, a sash frame, a crankshaft ,operatively'connected to saidsash frame to reciprocatethe latter, means for adjusting said sash frame in vertical direction, two one-way clutch mechanisms for alternately actuating said adjusting means, a feed control device operatively connected to said clutch mechae nisms comprising a housing for mounting on said crankshaft to rotate said feed control device in synchronism .withsaid reciprocating sash frame, an adjustable slide in said housing acting as a crank, a screw adjusting mechanism for said slide, means for rotating said-screw adjusting mechanism ineither direction for increasing or decreasing the eccentricity of said slide while the crankshaft is rotating, and means for locating and locking said rotating means in inoperative position. 1 V

8. In a stone cutting machine having a plurality of saw blades mounted in a reciprocating sash frame, means for moving said sash frame in vertical direction for feeding the saw blades into the stone block, including a control device adapted to be adjusted while said sash frame reciprocates, two one-way clutch mechanisms operatively connected with said control device and said sash frame adjusting means for alternately actuating the latter, said one-Way clutch mechanisms being also adapted to lock said sash frame adjusting means against torsional spring-back during part of the operating cycle, and threaded means for locating said control device in its adjusted position.

9. A feed control device of the character described, means-for rotating said device in synchronism with the operation of a machine, said feed control device comprising a'slide producing a crank motion, means for displacing said slide eccentrically to increase or decrease its throw while said feed'control device is rotating, andwedge-like locking means for maintaining said slide in displaced position. 1 1 i 10. In a gang saw for'cut ting stone blocks and the like, a sash frame, sawblades mounted in-said sash frame, a crankshaft-operatively-connected to said sashframe to'reciprocate the latter, a feed control device comprising a housing for mounting said device .on the crankshaft to rotate said device in synchronism with said sash frame, an adjustable slide in-said housing producing a crank motion, threaded means associated with said slide adaptedto displace said slide, actuating means for said threaded means for increasing or decreasing the eccentricity of said slide while said crankshaft and said feed control device are rotat ing, means for locating said actuating means in an inoperative position, and further means for locking said actuating means in said inoperative position and-for simultaneously locking said slide in its adjusted position.

' 11. In a machine of the character described, a multiplicity of saw blades, a sash for mounting said blades, a structure to suspend said' sash, means for reciprocating said sash relative to said structure, means for adjusting said sash vertically to feed said saw blades into the work material, ratchet means for actuating said sash adjusting means, other ratchet means for locking said sash adjusting means against torsional spring-back, a feed control device for actuating said first ratchet means, means for rotating said feed control device in synchronismwith the reciprocating sash frame, said feed control device comprising a slide producing a crank motion, means for displacing said slide eccentrically to increase or decrease its throw while said feed control device is rotating, and locking means for maintaining said slide in displaced position.

12. Mechanism for progressively feeding the reciprocating sash frame of stone cutting saws towards the work material comprising a control device, means for rotating said control device in synchronism with the reciprocating sash frame, said control device including a slide producing a crank motion, means for displacing said slide eccentrically to increase or decrease its throw while said control device is rotating, locking means for maintaining said slide in displaced position; two ratchet mechanisms operatively connected with said slide and adapted to feed the sash frame towards the work material in synchronism with the reciprocating movement of the latter.

13. In a feed control device, means for rotating said device in synchronism with the operation of a machine, said feed control device comprising means for producing a crank-motion, other means for displacing said crank-motion producing means eccentrically to increase or decrease its throw while said feed control device is rotating, and auxiliary means for maintaining said crankmotion producing means in displaced position.

r 10 14. A feed control device, means for rotating said device in synchronism with the operation of a machine, said feed control device comprising a housing, a slide associated with said housing for producing a crank motion, a spindle in threaded engagement with said housing and adapted to actuate said slide to displace the latter eccentrically to increase or decrease its throw, a drive shaft rotatably mounted in said slide at substantially a right angle relative to the axis of said spindle, cooperating driving means mounted on said spindle and on said drive shaft adapted to selectively rotate said spindle in either .one of two directions while said feed control device is rotating, and auxiliary means for locking said slide in displaced position.

' JULIUS WEGNER.

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

UNITED STATES PATENTS Number Name Date 322,821 Hofer July 21, 1885 530,910 Stone Dec. 11, 1894 2,320,235 I-Ijarpe et al May 25, 1943