US2589576A - Sawing machine - Google Patents

Description

March 18, 1952 H. E. ROSE SAWING MACHINE 4 Sheets-Sheet 1 Filed Dec. 5, 1946 INVENIJOR. HOWARD 5 ROSE BY m ZMM ATTOEMEXS.

March 18, 1952 H. E. ROSE n 2,589,576

SAWING MACHINE Filed Dec. 5, 1946 4 Sheets-Sheet 2 INVENTOR. HOWARD E. R SE ATTOEJVEYj.

March 18, 1952 E, ROSE 2,589,576

- 7 SAWING MACHINE Filed Dec. 5, 1946 4 Shets-Sheet s -COOLANT MOTQB i i I F 'INVENTOR.

' HOWARD 5.7?065 JMJ A TTOIQNE 7-5.

March 18, 19 52 v Filed Dec. 5; 1946 H. E. ROSE SAWING MACHINE 4 Sheets-Shet 4 uvvzzvfon HOWARD 5.3055 BY ATTO ENE Y5.

Patented Mar. 18, 1952 SAWING MACHINE Howard E. Rose, Peninsula, Ohio, assignor to The Motch & Merryweather Machinery Company, Cleveland, Ohio, a corporation of Ohio Application December 5, 1946, Serial No. 714,208 I 8 Claims.

This invention relates, as indicated, to sawing machines and more particularly to metal sawing machines of the type described in Patent No. 2,327,920 to J. G. Moohl, for example. Novel air actuated means are provided whereby stock may be fed to the machine and themachine automatically operated.

There are many advantages in the use of air pressure to operate automatic machines including flexibility of control and availability of the medium. When applied to metal sawing machines, however, problems arise in regulating the advance of the saw carriage and the feeding of the stock, due in part to the compressibility of such medium. To obtain accurate gauging of the stock it is essential that such stock shall not rebound from the gauge stop when fed thereagainst. It is of course also essential that the vention to provide air operated means for actuating a metal sawing machine and the stock feeding mechanism therefor which will be automatic and trouble-free. I

Another object is to provide stock feeding mechanism adapted to cooperate with the gauging means to ensure accurate gauging of the work to be cut off. I

A further object is to provide novel stock gauging means which will be rigidly mounted to ensure accurate gauging but which will automatically be movedclear of the end of the workpiece before such work-piece is cut oil.

Still another object is to provide control means connected with such gauging means operative to initiate the cycle of operation of the sawing machine.

Other objects will appear as the description proceeds.

To the accomplishment of the foregoing and related ends, said invention then comprises the features hereinafter fully described and particularly pointed out in the claims, the following description and the annexed drawing setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principle of the invention may be employed.

In said annexed drawing:

Fig. 1 is a side elevational view of a metal sawing machine and stock feeding means therefor? Fig. 2 is an end elevational view of such stock feeding means on an enlarged scale;

Fig. 3 is an end elevational view of the machine, broken away to show the construction of the work-holding vise;

Fig. 4 is a wiring diagram of the meanscontrolling such fluid pressure system; and

Fig. 5 is a diagrammatic. layout of the fluid pressure system through which such sawing machine and stock feeding means may be synchronously operated.

Referring now more particularly to such drawing and especially Figs. 1, 2 and 3 thereof, the rotary disc saw I is mounted on a carriage 2 adapted to be reciprocated relative to supporting base frame 3. The saw is driven by an electric motor housed in such carriage through a belt drive 4 and gearing within such carriage. The carriage travels on ways 5 on base frame 3 whereby the saw may be traversed to engage the Work, the cut-off work-piece being discharged down chute '6. Also mounted on base frame 3 to the other side of saw I is a work-holding vise comprising jaws 1 and 8 respectively. The serrated under surface of jaw I is adjustably seated on the serrated upper surface of sliding block 9, a screw I0 passing through slot H in jaw 1 being provided with a hand knob I2 to lock such jaw in adjusted position. Sliding block 9 is secured to vise seat l3 by means of an adjusting screw [4 with hand knob I5, permitting precise final positioning of the jaw I. The work is intermittently clamped and released by lateral reciprocation of jaw 8. Such reciprocation is obtained through action of fluid pressure cylinder I6 and piston I! which is operative through link 18 to rock lever 19 about its fulcrum 20. The upper end of such lever engages a notch 2| in the under surface of jaw 8 whereby such jaw may be reciprocated.

Means is provided intermittently to advance an extended work-piece such as bar stock, for example, into position to be cut off by the saw. Such work feeding means comprises a trough 22 supported at its outer end on column 23 and welded at its inner end to side plates 24 and 25.

These side plates are bolted to bracket 26 which is attached to base frame 3 of the sawing machine. Upstanding flanges 21 and 28 of bracket 26 form a trackway along which the work gripping means is adapted to be reciprocated. The work gripping means comprises a carriage meme ber 29 resting on flanges 21 and 28 and provided with two vertically slotted columns 30 and 3|.

7 A roller 32 is carried on a pin which is vertically set screws 35 and 36. Pivotally mounted between the lower portions of such columns is a serrated eccentric cam gripper 31 provided with a hand lever 38 to permit manual release when required. A spring-backed plunger 39 bears against the under surface of such cam forwardly of its pivotal mounting.

A lug 40 depending from carriage 29 is secured to the end of piston 4| extending from fluid pressure cylinder 42. Such cylinder is supported by a spring 43 from member 22 at its outer end and by arms 44 pivotally attached at 45 to acollar 46 near its other end. 7

The work is gauged by means of a stop 41. This stop is pivotally mounted at .48 on block 49 which is slidably supported on bar .50 .carriedby brackets and 52. Turning of hex nut 53 serves to clamp such block in desired position along such bar. A normally open limit switch 54 is mounted on block 49 in position to be engaged by arm 55 integral with stop 41. It is thus apparent that when the end of a work-piece engages stop 41 such stop will be pivoted very slightly, thereby closely switch 54. The operation of the machine may best be understood by reference to Figs. 4 and 5 of the drawing. To set up the machine the stock is first slid past the serrated cam gripper 31, lever handle 38 being raised to turn such gripper against the force of spring-backedplunger 39. The stock feed carriage is in fully advanced position as shown in Fig; 1.. When the'end of the stock engages stop 41 limit switch 54 is closed, completing the circuit through relay 56 and the normally closed switch 51. Relay 56, thus activated, closes maintaining contact 58 and alsocontacts 59 and Blkthereby completing the circuit through solenoid 6|.

The saw motor andcoolant motor (see Fig. A)

have previously been started by pressing the butline 80 from an air pressure source through pres-- sure regulating valve 82 and combination strainers and oilers 83 and 84. Air pressure from line 8| passes to lines 95 and 86, that in line 85 causing piston 81 in cylinder 88 to be advanced, starting the saw carriage 2 toward the work, and the pressure in line 86 (pressure regulating valve 89 having been opened) reciprocating piston H in cylinder 16 to firmly clamp the work. The work is thus clamped before carriage 2 has advanced sufiicientl-y to bring saw I into engagement with the work. A hydro-check -98,'comprising a piston cylinder assembly with adjustable rate of leakage, is employed to supply continued resistance to [the advance of the saw carriage, thereby snubbing any tendency to jump ;forw.ard and controlling the rate of such advance.

When piston I1 ceases to move in cylinder '15 is built up in line 9| sufiicient to overbalance pressure valve 92 and to move piston 4i back into cylinder 42. The cam gripper 31 moves freely in this direction, the amount of movement being greater than the length of the section which is to be cut off.

Initial movement of the saw carriage permits extension of spring 93 on-two-way valve 95, thereby shifting such valve to block lines 95 and 95. Since there is no pressure in line 98 at this time nothing is effected immediately by such action. When the saw carriage has advanced sufliciently to sever the Work, adjustable stop 99 on the saw carriage engages switch 51 which it opens, breaking the circuit through solenoid SI of valve 19 and shifting such valve to connect line I00 with pressure supply line 98. Line BI is connected with exhaust. As a result of this shift, air from line 100 passes through needle regulating valve llll to reciprocate piston 81 rapidly to return the saw carriage, the hydro-check 90 being ineffective in this direction of movement. After the saw car.- riage has returned, air pressure from line H35 passesthrough line 95, valve 94, line 95, and line 452 to cylinder 16 to reciprocate piston l1 and release the hold of the vise on the work. It will be noted that while switch 51 closes again as the saw carriage returns, the circuit nevertheless now remains broken since limit switch 54 is not engaged by the end of the work-piece and relay 56 permitted contacts 58, '59, and 50 to open when switch 51 was opened.

Pressure from line I02 passes through speed control valve [06, line 195,-valve H33, and line Hi4 into cylinder 42 to reciprocate piston 41 to feed the Work against stop 41. The air pressure in cylinder 42 exerts a continuing thrust, holding the work firmly against the stop. Limit switch 54, closed by engagement of the work with the stop, causes valve 19 to be shifted and the cycle is repeated until the stock is exhausted. The cycle may be stopped, whendesired, by manually shifting 3-'-way valve I 03.

By pressing stop switch '63 relay is de-activated, stopping both motors and opening contact 51, thereby breaking the circuit. The spring of solenoid 6| thereupon causes lines and 1 99 to be put in communication and all elements are returned to starting-position. Main shut ofl valve '82 may then be closed, turningofi the air.

It will be seen from the foregoing that I have provided an improved sawing machine capable of automatic operation through the employment of fluid pressure, and, more particularly, pneumatic means. The stock gauge is mounted firmly on the saw carriage, ensuring accurate gauging, and is carried clear of the end of the-work during the sawing operation. The stock is fed in such feature stated in any of the following claims or the equivalent of such be employed.

I therefore particularly point out and distinctly claim as my invention:

1. In a sawing machine, a reciprocable saw carriage, work holding means through which an elongated length of stock maybe intermittently advanced transversely of the path of reciprocation of such saw, and'means adapted to gauge ,such stock mounted on said carriage for such reciprocatory movement therewith and for engagement by the end of such stock when said carriage is in retracted position.

2. In a sawing machine, a reciprocable saw carriage, work holding means through which an elongated length of stock may be intermittently advanced transversely of the path of reciprocation of such saw, means adapted to gauge such stock mounted on said carriage for such reciprocatory movement therewith, and a switch associated with said gauging means adapted to be closed by engagement of such stock with said gauging means and thereby to initiate movement of said saw carriage.

In an automatic sawing machine, a reciprocable saw carriage, work holding means through which an elongated length of stock may be intermittently advanced transversely of the path of reciprocation of such saw, means adapted to gauge such stock mounted on said carriage for such reciprocatory movement therewith, and a switch associated with said gauging means adapted to be closed by engagement of such stock with said gauging means and thereby to initiate clamping of said work holding means and movement of said saw carriage.

4. In a sawing machine, a reciprocable saw carriage, work holding means through which an elongated length of stock may be intermittently advanced transversely of the path of reciprocation of such saw, a bracket on said carriage, a bar carried by said bracket, and stock gauging means adjustably mounted on said bar for such reciprocatory movement with said carriage in position to engage the end of such stock when the latter is thus advanced through said work holding means.

5. In a sawing machine, a reciprocable saw carriage, work holding means through which an elongated length of stock may be intermittently advanced transversely of .the path of reciprocation of such saw, a stock gauge mounted on said carriage for such reciprocatory movement therewith adapted to engage the end of such stock, and air-operated stock feeding means operative to advance such stock into engagement with said gauge and hold it firmly thereagainst until clamped by said work holding means.

6. In a sawing machine, a reciprocable saw carriage, work holding means through which an elongated length of stock may be intermittently advanced transversely of the path of reciprocation of such saw, a stock gauge mounted on said carriage for such reciprocatory movement therewith adapted to engage the end of such stock, air-operated stock feeding means operative to advance such stock into engagement with said gauge and hold it firmly thereagainst until clamped by said work holding means, and a switch associated with said gauging means adapted to be operated by engagement of such stock with said gauging means and thereby to initiate clamping of said work holding means.

7. In a sawing machine, a reciprocable saw carriage, work holding means adapted to hold a length of stock transversely of the path of reciprocation of such saw, whereby portions thereof may be cut off by the saw on said carriage, and a stock gauge carried by an outrigger support on said carriage and adapted to engage the end of such stock when the latter is advanced through said work holding means and to clear such end when said carriage is thus reciprocated to sever such stock.

8. In a sawing machine, stock gauging means mounted for slight movement when engaged by an end of a length of stock, stop means rigidly supporting said gauging means against further movement, fixed stock clamping means operative in response to such slight movement of said gauging means to firmly clamp such stock, and pneumatic stock feeding means operative intermittently to advance such stock and actively yet resiliently urge the same against said gauging means until clamped by said clamping means.

HOWARD E. ROSE.

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

UNITED STATES PATENTS I Number Name Date 1,367,564 Pritchard Feb. 8, 1921 1,385,369 Ferrier July 26, 1921 1,782,692 Lawson Nov. 25, 1930 2,144,335 Jensen et al Jan. 17, 1939 2,262,619 Morris Nov. 11, 1941 2,326,463 Johnston Aug. 10, 1943 2,327,920 Moohl Aug. 24, 1943 2,351,962 Harrison June 20, 1944 FOREIGN PATENTS Number Country Date 463,312 Great Britain Mar. 19, 1937

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