US2450473A - Abrading device - Google Patents

Description

H. E. GOLDIE ABRADING DEVICE Oct. 5, 1948.

5 Sheets-Sheet l I Filed April 5, 1946 AYTQm/EY H. E. GOLDIE ABRADING 'DEVICE Oct. 5,1948.

5 Sheets-Sheet 2 Filed April 5, 1946 ATTORNEY Filed April 5, '1946 H. E. GOLDIE ABBADING DEVICE 5 Sheets-She et 3 o I l L --1 Fig.5

//v vt/vro/e flgc 7 1, 5040/15 4 TTQR/VE Y Filed-April 5, 1946' Oct. 5, 1948. H. E. GOLDIE 2,450,473

' ABRADING DEVICE 5 Sheets-Sheet 4 //v yE/v 70 R #50 Tani; 6'01. 0/5

Oct. 5, 1948. ."H. E. GOLDIE 2,450,473

ABRADING DEVICE 5 Sheets-Sheet 5 Filed April 5, .1946

Arron/wry Patented Oct. 5, 1948 2,450,473 ABRADING nsvrcn Hector E. Goldie, Monti eal, Quebec, Canada, as-

signor to Rucenstein Bros. Company, Montreal,

Quebec, Ganada,

Application April 5,

In Canada I '7 Claims.

This invention relates to a cloth cutting machine, and more particularly to an abrading device attached to or forming part of a reciprocating straight knife cloth cutting machine.

Having regard to the foregoing, it is a principal object of this invention to provide a sharpening device adapted to form a part of the cloth cutting machine, which is fully automatic in operation, light in weight, and compact in structure.

It is a further object of this invention to provide an abrading device which reciprocates the abrading wheels at a governed speed, and automatically frees the abrading wheels from the knife at the end of one down and up cycle.

It is a further object of this invention to pro vide an abrading device which after one abrading cycle automatically stops leaving the cutter knife free so that the operator may continue cutting without further adjustment.

It is a further object of this invention to provide means for guiding the abrading wheels in their reciprocal cycle in line with the knife edge.

Statement of invention lhe applicants invention is applied to a cloth cutting machine of the reciprocal straight knife type having a motor adapted to drive the knife. In accordance with the invention, this apparatus is provided with a rod having a helically double threaded keyway in its peripheral surface and adapted for rotation and reciprocation parallel to the knife, the rod being rotated from the motor which drives theknife, a follower adapted to engage the thread on the rod to cause its reciprocation upon its rotation. A sharpening carriage is mounted on the rod for reciprocation with it and abrading wheels are rotatably mounted on the carriage and driven by rotation of the rod. With respect to the rotation of the rod in a sharpening cycle, a driven element is connected to the rod for rotating it, a driving element connected to the motor, the driven element and the driving element associated mechanism constituting a clutch adapted to be engaged to rotate the rod and disengaged at the end of the sharpening stroke.

In accordance with a more specific phase of the invention, it also includes means for guiding the abrasive wheels relatively parallel to the knife, said means including guide members adapted to straddle the knife guide, and resiliently ride on each side thereof to guide the abrasive wheels in a path paralle1 with the guide which guides the path of the knife.

Detailed description- Still other features will be apparent in the a corporation of Quebec 1946, Serial No. 659,778 anuary 23, 1946 course of the following detailed description in' which reference is made to the accompanying drawings, wherein:

gure' l is a cutaway front view of a'preferred form of the abrading mechanism as adapted to a cloth cutting machine of the vertical reciprocating straight knife type.

Figure 2 is a cutaway side view of the abrader mechanism in Figure 1.

Figure 3 is a rear elevation mainhousing of of the inside of the ting .ne with the upper portion of the hous the rod and the abrading carriage not shown.

Figure l is a plan view of the housing shown a in Figure 3.

Figure 5 is an elevation of the starting assembly swivel member removed from the remainder of the apparatus.

Figure 6 is a'plan'view of the starting assembly v swivel member removed from the remainder of the apparatus.

Figure 7 is a schematic View of the abrader car showing the gear train mounted. on the riage acrading arms.

Figure 8 is a plan View of the abrader carriage showing in addition the knife, the guideway and the ahrader carriage guide bracket acting on the knife guideway.

Figure 9 is a side elevation of the abrader carriage, the casing cut away to show the gear train the ahrader carriage showing the rnain driving which is attached to the reciprocating rod.

Figure 13 is a plan view of the abrader arms showing the spring urging the ahrasivewheels' inwardly toward the knife edge. Figure 14 is a reverse cutaway gear chain shown in Figure '7. I a

M ain assembly The ahrading or knife sharpening apparatus is mounted on a slightly modifiedstraighti knife.

cloth cutting machine consisting of abase plate l,- a cloth lifting plate 2,

handle 5. A straight, cloth cutting knife Qis the abrader showing the starting and stopping mechanism removed from the cutto the alorader carriage plan view of the cover of plan View of the rollers 3, onwhichthe cutter is moved about the cutting table, a stand- 7 ard or cutting knife guide a motor 8 mounted on the cutting machine frame 5 anda guide reciprocated by a crank l suitably connected to the motor 8 the knife being guided by a grooved guideway in the standard 4.

A housing II is mounted on the cutting machine frame 5, and adapted to provide motion to the abrading apparatus is a transmission comprising a friction wheel 80 and worm 8 I, adapted to swivel and so engage the shaft of the cutting machine motor. A member 44 (Figures 6 and 7) mounted within the housing ll provides the swivel mounting for the friction wheel. A gear 82 in meshed contact with the worm BI is mounted on a sleeve 42 which is adapted to rotate within the member able within the sleeve 42 is keyed to the sleeve 42 and receives rotary motion thereof. A traverse thread cut on the face of the rod 40 is engaged by a follower key 4! mounted in the housing II which upon rotation of'the rod 40 forces the rod into a reciprocating down and up motion. A starting lever 58 attached to the member 44 by the collar 45 controls the swivel motion of the member 44.

The starting mechanism The assembly comprising thefriction wheel 80, the member 44 and the starter lever 58 as detailed are swivelly mounted whereby the forward and backward motion of'the starting lever as shown in Figure 4, places the friction wheel in contact with the drive shaft of the motor and releases it, gaged position. An automatic stopping rod 70, which will be detailed later, contacts a collar which is one end of a sleeve 55 slidably mounted on the starting lever 58, forcing the starting lever into the disengaged position. Pressure on the head 56 of the sleeve 55 forces the sleeve in, compressing a spring 59 and clears the collar 57 past the stopping rod 10, then allowing the starting lever 58 to move to the position B putting the friction wheel in contact with the drive shaft of the motor. A tension spring 60 tends to hold the member 44 in this position.

The abrading assembly The abrading assembly consists of a main carriage 43 in which rotates the main driving gear 30 which is directly attached to and receives rotary motion from the main reciprocating rod 40. A pair of spring urged arms 2| and 22 are pivotally mounted to the main carriage 43 by the axles of the gears 32 A and B and each carry a train of gears 32, 33, 34, to rotate the abrading wheels which are mounted on these arms. The axle of the head gear 32A carries a gear 3| which is driven directly by the main driving gear 30. The two head gears 32 A and B, are in direct contact whereby rotating the abrading wheels 20, which are mounted on the axles of the gears 34 A and B, in opposite directions. A spring, 23 as shown in Figure 12, urges the free ends of the arms 2| and 22 towards each other, thereby causing the desired pressure to be exerted by the abrading wheels when in contact with the knife edge 9.

When the abrading assembly is put in motion by the rotating of the reciprocating rod, the whole assembly is reciprocated the full length of the cutting blade by means of the key 4| being engaged in the reciprocating thread out on the surface of the rod 40. To provide for the accurate guiding of the abrading wheels 20 in a line parallel with the knife a guide frame 90 is mounted on the abrader carriage (Figures 8, 9,

11). A guide roller 92 engages one side of the 44 a rod 40 slidably oper-' the dotted lines showing the disenstandard 4 and a spring urged guide wheel 93 mounted on the bracket engages a groove 94 on the other side of the standard 4, thus when the abrader carriage reciprocates in its sharpening cycle, the abrader wheels are carried in parallel line with the knife edge.

The automatic stopping rod The automatic stopping rod 70 in this preferred structure consists of a round rod pointed at one end, fiat on the other, and slidably mounted within the housing H whereby the pointed end may contact the collar 57 of the starting lever, and the flat end contact the abrader carriage 43 during the last stage of its upward motion. The rod 70 is urged downward by a spring ll acting between the mounting and a stop collar 12 on the rod which is permitted to slide downwardly by the action of the springs 1|, as the carriage 43 starts to descend in an abrading cycle, is clear from any contact with the starting sleeve collar 51. As the carriage in the last stages of this return motion contacts the lower end of the rod 10, the rod is forced upwardly against the downward urging of the spring 1| placing the pointed end of the rod in contact with the starting lever collar 57 causing the starting lever 58 to swivel to one side, thus swivelling the sleeve 44 and the component parts of the swivelly mounted transmission assembly including the friction wheel out of engagement with the cutting machine motor.

In order to provide clearance of the starting lever collar 57 from the rod to start the abrading cycle, the starting lever sleeve 55 is slidably mounted on the starting lever 58 and spring urged into a downward position aligning the collar 5'! with the pointed end of the stop rod 10 by the spring 59 (as illustrated in Figure 1). Manual pressure on the end 55 of the starting sleeve places the collar 57 out of alignment with the end of the rod 76, thus allowing the starting lever to swivel a distance equal to the height of the collar above the sleeve 55 which is sumcient to place the friction wheel into engagement with the cutting machine motor, thus starting the abrading cycle and the outward motion of the carriage 43. As the rod 10 descends by the force of the spring H and the outward motion of the carriage 43, the sleeve 55 and the collar 51 are forced back in their normal or outward position by the action of the spring 59 aligning the collar 51 with the pointed end of the stop rod 75 which, when forced upward by the return motion of the carriage swivels the friction wheel out of contact with the cutting machine motor thereby stopping the abrading cycle.

The separating pin The separator pin 5% is wedge shaped and is mounted on the bottom of the housing l l in such a manner that upon the last stage of upward motion of the abrader carriage, the separator pinwedg'es between the two abrader bearing arms 2| and 22.at a point 55 (Fig. 8) thereby forcing the abrader arms apart thus freeing the abrader wheels from the knife edge at, the; uppermost stage of the abraders reciprocal run;

The presser foot safety stop the top of the bracket l2, but when fully extended as shown'in'Figure 2 the end of the rod is below the top surface of the bracket l2.

Substantially centrally pivotally mounted to the upper face of the bracket I2 is an irregularly shaped member 16 adapted to engage the presser foot rod 15 if the rod is extending above the upper surface of the bracket [2, but to pivot freely if the presser foot rod 15 is fully extended so that the end of the rod 15 is below the upper surface. The opposite end of the member 16 is spring urged into contact with the side of the collar 51 of the starting rod, thereby making it impossible to press the starting sleeve 55 inwards if the presser foot rod 15 is extending above the upper face of the bracket l2, whereby it is engaged by the member 18 holding it rigid against pivotal movement, thus preventing the inward movement of the sleeve 55 which is necessary in order to swivel the member M to engage the friction wheel 80 with the cutting machine motor to start the sharpening cycle of the abrader. 1

The knife sharpening elements in this preferred structure consists of a pair of abrader wheels, each having a plurality of spaced-apart blade engaging surfaces, for engaging the opposite sides of the cutting knife at alternate points as illustrated in Figures 1, 9 and 10, made of emery or other suitable abrasive material. The abrasive wheels being mounted on the axle of the gears 34A and B respectively.

The sharpening operation Assuming the abrader mechanism to be in its rest -or stopped position, wherein the friction clutch wheel is disengaged from the drive shaft of the motor, the starter rod is in its rearward position A (Figure l) with the sleeve in the out position. The abrading assembly is in its top or rest position, as in Figure 1, the carriage having forced the automatic stopping rod up and into contact with the collar of the starting lever sleeve, holding the starting lever in its off position E (Figure 4). The abrading wheels are free from the knife edge due to the arms being wedged apart by the action of the separator pin. The presser foot is fully extended and the cutting machine is ready for cutting or sharpening.

No adjustments are necessary to sharpen the cutting knife, merely press in on the starting lever sleeve and the action of sharpening and stopping is completely automatic.

To sharpen the knife, the operator presses lightly on the starting lever sleeve 56, thus freeing the collar 51 from contact with the automatic stop rod allowing the spring 6!) to swivel the starting assembly to the B position, putting the friction clutch wheel into contact with the main shaft of the running cutter motor. The rotary motion thus imparted to the friction wheel is carried through the worm Bl, the gear 82, the sleeve 42 to the reciprocating rod M which is keyed to the sleeve 42. The stationary guide key M being engaged in the reciprocating thread cut in the periphery of the rod 4e forces this rod, when it rotates, into a reciprocating down and up motion equal to the length of the thread, which is designed the same length as the cutting edge of the knife.

The rotating motion of the rod M is carried through the gear train from gear 3E1 directly connected to the rod dill through gear M to 32 A and B on to S4 A and B (see Figure '7). The abrading stones mounted on the axles of the gears 34 A and B are thus rotated in opposite directions and reciprocated the length of the blade as explained above.

As the rod 40 starts to rotate and reciprocate several actions take place at the same time, as follows:

(a) The main abrader carriage, which is mounted by gear 30 to the rod 40, starts its downward travel, thereby freeing the abrader arms from the wedge shaped separator pin, allowing the spring 23 to force the abrader wheels against opposite sides of the knife edge as the carriage reciprocates.

(b) As the carriage 43 starts downward it releases contact with the automatic stopping rod H! which is forced downward by spring H to the extent of the collar 12 thus freeing the upper end of the rod 19 from the side of the collar 51 of the starting lever sleeve, the spring 58 then pushing the sleeve 55 to its out or extended position as shown in Figure 4, position B.

The abrading assembly makes a full downward and upward knife sharpening cycle. As it nears the last stage of its upward motion the two arms 2! and 22 are engaged by the separating pin 50 which forces them apart thus freeing the abrader wheels from the knife edge. At the same time the carriage also contacts the automatic stopping contact with the sleeve collar 51, the action of contact being to force the starting lever rearward from position B to A (Fig. 4) thus swivelling the member 44 and disengaging the friction wheel from the motor shaft, thus bringing the whole abrading apparatus to a stop with the carriage up and the abrader wheels disengaged or free from the cutting knife.

In the event of the presser foot not being fully extended, it would be impossible to start the abrading mechanism due to the lever 16 being rigidly held against the spring side of the collar El thus preventing the in motion of the sleeve necessary. to free the collar 51 from the stopping rod 10 for starting.

It will be understood that Without departing from the spirit of the invention or the scope of the claims, various modifications may be made in the specific expedients disclosed. The latter are illustrative only and not restrictive, it being desired that only such limitations shall be placed thereon as may be required by the state of the prior art.

I claim:

1. An apparatus of the type described, comprising, a single motor, a straight knife reciprocable by said motor, a rod having a helically double-threaded keyway in its peripheral surface adapted for rotation and reciprocation parallel to the knife, a follower adapted to engage the thread on said rod for causing reciprocation of said rod on its rotation, a carriage mounted on the rod, rotatable abrading means mounted on said carriage and rotatable by said rod, a driven element connected to said rod for rotating it, a driving element connected to said motor, a clutch between said driven element and said driving element, said rod being positivel driven from the motor when the clutch is engaged thereby to cause outward and return sharpening movements of the abrading means in a sharpening cycle and rotating sharpening movements of the abrading means, manual means for causing engagement of said clutch, and means operated by contact with said carriage in its return movement for causing disengagement of said clutch.

2. An apparatus, according to claim 1, including starter assembly a pair'ofarms mounted on said carriage, said.

separating the wheels from the knife.

3. An apparatus of the type described, comprising, a motor; a straight knife adapted for reciprocation, drive means from said motor to said knife; a housing, a transmission assembly in the housing comprising a swivel mounting swivelly mounted on said housing, a sleeve mounted for rotation within said swivel mounting, a gear fixedly mounted on said sleeve with said sleeve as an axle, a worm mounted on said swivel mountwith said gear, a rotatable clutching element axially fixed to said worm, the swivel mounting adapted to move said clutching element into and out of engaging contact with said motor to rotate said sleeve, means for swivelling said swivel mounting, a rod having a helically double-threaded keyway in its peripheral surface mounted for reciprocasaid knife, a housing, a swivel mounting in said swivel mounting adapted to move said friction wheel into and out of friction contact with said motor, a rod mounted within said swivel mounting, transmission means between said friction wheel and said rod adapted to rotate and reciprocate said rod, a carriage mounted on said rod, abrading means rotatably mounted on said carriage adapted to straddle said knife, a first spring acting between said swivel mounting and said housing to normally urge said friction Wheel into engagement with said motor, a lever attached to said swivel mounting, a sleeve slldably mounted on said lever, a collar on said sleeve, a second spring adapted to urge said sleeve in an outward direction on said lever, a stop rod slidably mounted in said housing actuated by contact with the carriage on its return movement to contact said collar and move said lever to swivel said friction wheel out of contact with said motor.

is eng'agedwith said motor by the action of said first spring. I

6. A straight knife cutting machine, comprising in combination, a reciprocating knife, a knife guide, a motor for driving the said knife, abrasive wheels mounted on a carriage for downward and upward linear movement in a sharpening cycle, mechanism adapted to be disengageably engaged with the motor for causing both a linear'down and up movement of the wheels parallel to the knife edge and rotating the abrasive wheels, means for guiding said abrasive wheels relatively parallel to said knife, said means comprising a bracket, a pair of oppositely disposed guide members rotatably mounted on said bracket, at least one of said guide members being resiliently guide, said abrading wheels parallel with said knife.

7. An apparatus of the type described, comprising, a single motor, a straight knife adapted for reciprocation, drive means from said motor to said knife, a housing, a rod having a helically double-threaded keyway in its peripheral surface adapted for rotation and reciprocation parallel to the knife, and a follower acting in said keyway to cause reciprocation of said rod upon rotation, a driven element connected to said rod for rotating it, a driving element connected to said motor,

a clutch between said driven element and said driving element, a carriage mounted on said rod, a pair of arms mounted on said carriage, abrading wheels rotatably mounted on each of said arms, means for acting on said arms to urge said abrading wheels into contact with'said knife, means adapted to contact said arms on their return movement to spread said arms to disengage said wheels from said knife.

H. GOLDIE.

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

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