US1173983A

US1173983A - Cloth-cutting machine.

Info

Publication number: US1173983A
Application number: US4739615A
Authority: US
Inventors: David Perlman
Original assignee: Individual
Current assignee: Individual
Priority date: 1915-08-26
Filing date: 1915-08-26
Publication date: 1916-02-29
Anticipated expiration: 1933-02-28

Description

D. PERLMAN.

CLOTH CUTTING MACHINE.

APPLICATION FILED Aua.2s, m5.

Patented Feb. 29,1916.

6 SHEETSSHEET anventoi 951 W flfl'ozmua V D. PERLMAN.

CLOTH CUTTING MACHINE.

APPLICATION FILED Aue.26, 1915.

Patented Feb. 29, 1916.

6 SHEETSSHEET 2.

5] vwewtoz mm m W W D. PERLMAN.

CLOTH CUTTING MACHINE.

APPLICATION FILED AUG.26. 1915.

3 wuewtoz 6 SHEETS-SHEET 3.

Patented Feb. 29, 1916.

Patented Feb.29,1916.

I s SHEETSSHEET 4. E

D. PERLMAN.

CLOTH CUTTING MACHINE.

APPLICATION FILED AUG-26, I915.

D. PERLMAN.

CLOTH CUTTING MACHINE.

APPLICATION FILED AUG-26, I945.

3 nuqwlfoz $513 A 61 3mm,

D. PERLMAN.

- CLOTH CUTTING MACHINE. I APPLICATION FILED AUG-26' I915- 7 3, Patented Feb. 29,1916.

6 SHEETS-SHEET 6.

'l H 5 1 11/1 Ill-III!" DAVID PERLMAN. or NEW' YORK, N. Y.

CLOTH-CUTTING MACHINE.

To all whom it may concern:

Be it known that I, DAVID PERLMaN, a subject of the Czar of Russia, and resident of New York, in the county of New York.

and State of New York, have invented certam new and useful Improvements in Clothwith which I'am familiar, the sharpening of the knife is an operation involving a considerable loss of time, the liability er.

injury to the operator and to the machine, and usually performed with'difiiculty and with-poor results. This is.due partly to the character of the. sharpener which is used and partlyto "the fact that most operators,

even though highly skilled in the art ofcutting cloth, are not skilled in the art of sharpening the cutting instrument.

To sharpen the knife of most cloth cut.

ting machines of this type, it is necessary to raise the presser-foot and fasten 1t 1n raised position. As this presser-foot or the support therefor serves as a guard in front of the portion of the knife edge above the cloth, the raising of the presser-foot and its support exposes the knife edge so that during the sharpening operation, the operator is liable to get his hand on the exposed edge and be seriously injured. The exposed edgeis then usually sharpened by a very primitive and impracticable operationi' Usually a stick or rod coated with emery or other abrasive material is held in thehand and rubbed lengthwise against the p sides of the knife at the edge to be sharpcried, the rubbing operation takingplaceis alternately upon opposite sides until the knife becomes sharp. The operator must then return the presser-foot guard; to its original position and time; is lostin re-adjusting it to exactly the original position and in accordance with the exact'height of the layers of cloth being cut. This method of operation not only gives very poor results with a waste-of time and danger to the operator, but it also has other disadvantages. The operator must be skilful as'the Specification of Letters Patent.

tion does not make a proved 1 construction is the knife can be Patented Feb. as, rare.

Application filed August 26, 1915. Serial No. 472396.

holding of the sharpeningstick at an angle I slightly diflerent from the correct one, will result in dulling rather than sharpening the knife. Furthermore, the sharpening operaperfect bevel throughout the whole length of the knife and ordinarlly wears away more of the knife along one portion than at another so that the cutting edge eventually becomes somewhat scalloped. As soon as the knife edge becomes uneven, it no may be, the cause of oiling the cloth. In

the sides of the knife, a portion of the stick often, and in fact. usually, comes incontact with the support for the driving mechanism which stands in the rear of the knife. Thus,

-the support is. worn away by the unnecessary grinding action on the sides thereof. I

,am aware that certain machines have been designed to overcome some of these difficulties, but none of them with which I am familiar has proven practical or successful and none are'in use. By means of my invvent1on,'I overcome these various disadvantages and: render the sharpening mechanism so easily operated and so nearly automatic in action that the. operator cannot very well fail *to get satisfactory results. I overcome-the disadvantage of raising, lowering and adjusting the. presser-foot guard e5 st be discarded as it i rubbing the sharp'eni g stick up and down in accordance with the thickness of the goods every time the knife needs to be sharpened. Thelmechanism is so arranged that after the p esser-foot has once beenadjusted; to the"; proper position in accordance; with the thickness of the layers of cloth to be cuii,iit may be quickly and" I accurately returned to this adjusted position after theqsharpening operation. In fact I preferably so. arrange the parts that the pressef'ifoot' CQDEIOC lock itselfin any other but the correc position. J v A furtherfimportant feature of my iman arrangement Whereb the resser-foot guard protects the knife alb ng its full length and prevents the operatorfrom being injured during the,

sharpening operation While I in other machines the guard is rnoved'to inoperative position and the knife edge exposed before sharpened. In order to sharpen the'knife with my improved device, all the operator has to do is to lower the resser-foot guard to its extreme botformed exactly in the which is desired and and of the excessive 'wear in l1nk,p1ns,

tom position, permit it to remain there a few seconds and then lift it back to its upper end. The stones are so mounted and so operate as to give a perfect cutting edge plane of the center of the material constituting the knife blade and in a straight line from the top to the bottom. The grinding stones can never swing in contact with the support of the machine and cannotobstruct the view of the chalk or pencil marks on the cloth to be cut. The stones are automatically set in motion to perform the rinding operation and when they have comp eted the downward and return movement, they automatically stop. The grindingmechanism is so constructed that the stones can be adjusted by anyone without mechanical knowledge by simply loosening the screws which retain the support and slightly rotating the support so as to bring both of the stones at equal distances toward the plane of the cutting edge. The movement of the stones is equal and simultaneous and one single character of adjustment takes care of both the wear on the stones and the wearing away of the knife blade itself. This adjustment is needed only when the stones or knife blade have become materially worn from their original form.

The grinding of the knife may be performed either while the knife is normally working up and down or while the knife is locked in raised position. To accomplish this, I provide means for disconnecting the knife from the source of power and looking it in position at the same time that the grinders are connected to the source of power, the two operations being accomplished by the single movement of a controlling member.

Whether or not the knife is to be ground while reciprocating or while stationary, will depend largely upon the character of edge this depends upon the character of the goods to be cut.

To prevent the vibration of the whole of the machine due to the jar caused by the rapid and repeated changes in the direction of movement of the knife, the eccentric, and the connecting parts, I provide a further important feature of my invention. This jarring action is the principal cause of the bearings of the motor getting out of order the connecting and other parts. In my improved construction I provide a special form of shock absorbing spring cushion in the connecting link which will absorb the jar caused by the sudden changes in the direction of movement of the oscillating parts. I am aware that attempts have been made to overcome this jar by placing rubber cushions or the likeunderneath the plate and between the latter and the supporting rollers. This does not prevent the vibration of the Whole machine and in fact tends to increase the vibration although to a certain extent it relieves the jar. In my improved construction, the cushioning means is disposed between the body of the machine and the reciprocating parts so that the vibration caused by the latter is not transmitted to the body of the machine and the base of the latter may come into direct contact with the table without objectionable jumping of the base which occurs when the cushioning means is placed beneath the latter.

My invention involves various other important features which will be pointed out more articularly hereinafter, but I wish it speclfically understood that in describing all of the features embodying my invention, I do not desire to be limited to such specific description.

In the accompanying drawings to which reference is to be had and in which similar reference characters indicate corresponding parts in the several views, I have illustrated only one embodiment of my invention.

Various changes may be made within the scope of my invention as defined in the apview of a machine embodying my invention;

Fig. 2 is a side view thereof; Fig. 3 is a vertical section of a portion of the machine substantially in the plane of the knife and on a somewhat larger scale than Figs. 1 and 2; Fig. 4 is a view similar to a portion of Fig. 3 showing the operation of one gear shift mechanism; Fig. 5 is a sectional detail substantially on the line 5-5 of Fig. 4; Fig. 6 is a transverse section substantially on the line 6-6 of Fig. 3; Fig. 7 is a vertical section on the line 77 of Fig. 3 and showing the parts in normal position, that is, with he grinder operating mechanism in raised or inoperative position; Fig. 8 is a images.

larger scale than in Fig. 3; Fig. 17 is a face View of the parts shown in Fig. 16; Fig.

18 is a View similar to a portion of Fig. 16, but showing the crank disconnected from the drive shaft; Fig. 19 includes face and edge views of the knife operating crank;

4 Figs. 20, 21 and 22 each show two views of the clutch mechanism of Figs. 16 and 17; Fig. 23 is a transverse section on the line 2323 of Fig. 3; Fig. 24 is a face view of the parts shown in Fig. 23; Fig. 25 is a side elevation of one grinder stone and the c supporting and driving parts; Figs. 26, 27, "28 and 29 each show two or more views of the parts for. supporting, driving and adjusting the grinder stones, said parts being shown in combination in Fig. 3; Fig. 30 is a detail showing the parts for starting the grinders in operation upon the lowering of the presser-foot support and guide. Fig. 31 is a view similar to Fig. 30, but showing the parts in maximum lowered position, and b Fig. 32 is a top plan view of a portion of Figs. 1 and 2.

I have illustrated one embodiment of my invention as applied to a machine having ceirtain features in common w1th other machines of the same type to which my invention is particularly applicable. The machine in its main essentials includes a plate or base 40 adapted to rest upon the table and move along the latter beneath the goods to be cut. A standard 41 is rigidly secured to and extends upwardly from this base and carries at its upper end an electric motor'42 or any other suitable source of power. The motor may have any suit-' able form of terminals 43 to which electric wires may be connected and the frame or' casing of the motor may have a handle 44- by means of which the entire machine may be moved along the platform and guided so that the knife will follow the desired line upon the cloth or other goods being cut.

- A; knife 45-is mounted to move vertically directly in front of the standard 41 and is preferably guided by the latter. The base i -may' have an opening 46 into which the lower end of the knife may enter when in its lowered position and may have rollers 47 or other anti-friction devices for facilitating the movement of the base over the table. These features in their general arrangement and broad combination constitherefor.-In order to protect the operator and prevent him from at any time getting h1s hand on the knife, I provide an improved form of guard which does not need to be removed from in front of the knife at any time and whichmust be in proper guarding position when the knife is being sharpened. In the specific form illustrated, this guard is in the form of a tube 48 mounted for vertical movement directly in front of the cutting edge of the knife and substantially parallel to said cutting edge. This guard has a presser-foot 49 on its lower end which is adapted to rest upon or en-- gage with the upper surface of the goods during the cutting operation. The combined guard and presser-foot 48 is supported at its upper end and telescopes with:

in a tubular casing 50 rigid with the frame of the machine. As shown particularly in F g. 2, this casing extends for aconsiderable distance above the motor and is connected to the frame not only at its lower end, but

by means of a bracket or brace rod 51 engaging with the casing intermediate of the ends of the latter.

The guard may be raised or lowered dependent upon the thickness of the goods ei ng cut and may be locked in the desired adJusted position. The guard 48 serves not onlyto carry the presser-foot andto protect the knife, but also serves as a guide for the grinding mechanism so that the latter may slide up and down the guard While grinding the knife. The guard is so constructed that its lower end may be brought adjacent to or into engagement with the base 40 and may be locked at its lower end so as to make it more rigid during the justing mechanism is shown particularly in" Figs. 10 to 15 inclusive.

The tubular casing 50, within which the guard 48 slides, is rigidly secured to a bracket 52 which latter is rigid with the mainframe of the machine. The guard may be locked to the tubular casing 50 in any desired longitudinal adjustment and within the guard 48 is a third telescoping member 53 which, when moved downwardly member 54 in the base.

normallv has its lower end substantially iii respect to the guard, will enter a socket This inner rod 53 anism about to be described.

The guard 48 has a flange or plate rigid therewith and projecting outwardly from one surface thereof substantially as shown in Fig. 13 and within two vertically extending, substantially

parallel slots

56 and 57. The plate or flange 55 is mounted between two

plates

58 and 59. These may be separate and rigidly connected in any suitable manner or they may be theside portions of a metal block with a deep -groove cut therein as shown in Fig. 14. Transverse pins extend from 7 one plate to the other and project through the

slots

56 and 57 The distance between the'pins is less than the length of the slots so that the p1'ates58 and 59 may have a vertical sliding movement on the plate 55. The guard 48 has a longitudinally extending slot thereinjust below the plate 55 and out through this slot extends a pin 61 rigidly connected to the inside rod 53. The

two

plates

58 and 59 have opposed recesses or grooves which receive the pin 61 whereby any longitudinal movement of the said

plates

58 and 59 is accompanied by a corresponding endwise movement of the, rod 53.

For purposes of assembly or repair, thepin 61 is preferably threaded into the rod 53 and the recesses in the

plates

58 and 59 are such that the pinmay be unscrewed and removed endwise when desired.

At the lower end of the slot in the guard 48, I provide an outwardly extending lip or flange 62 serving'as a guide for a pin 63 and has an abutment for a small coil spring 64. The upper end of the pin 63 may, if desired, be screwed into the side of the pin 61 and the upper end of the spring may engage with the pin 61 or with the lower ends of the

plates

58 and 59. The spring is of such size and strength that it normally lifts the pin 61 to the maximum distance and holds the two upper pins 60 at the upper ends of the

slots

56 and 57. With the parts in this position, the lower end of the rod 53 will be -flush with or withdrawn into the lower end of the guard 48 as shown in Fig. 10. In the normal operation of adjusting the presser-foot inaccordance with varying thicknesses of the cl0th, the inner rod 53 and the guard 48 will move together and the parts will retain the same relative positions,

' as is shown in Fig. 10.

For holding. the guard and presser-foot at the proper elevation, I employ clamping or locking mechanism capable of disengagement'at' two separate points. This includes this plate are a slide 65 mounted for vertical movement on the tubular casing 50 and adapted to be detachably connected to said casing and also detachably connected to the guard. For detachably connecting the slide to the stationary tubular casing, I provide the latter with a series of recesses, apertures, or teeth, along its opposite sides and provide the slide 65 with one or more pawls or dogs adapted to coiiperate with said recesses, apertures or teeth. As shown, the slide 65 has two pawls or dogs 66 pivoted thereto upon the upper surface and mounted to swing in a horizontal plane. The outer ends of these pawls or dogs are normally spread apart by a spring 67 and the opposite ends engage with the teeth or recesses in the sides of the tubucesses on one side of the casing 50 are opposite to the spaces between the recesses on the opposite side so that never will more than one of the dogs engagewith the casing so as to lock the slide in position.

For detachably connecting the guardv 48 to the slide 65, I provide a suitable spring pressed catch. As shown this includes a yoke part 68 adapted to engage with opposite sides of the

plates

58 and 59 and pivotally supported on the projecting ends of the pins 60 which extends through the slot 56. At the outer end of the yoke is an upwardly extending hook 69 adapted to engage with a shoulder on the slide 65. Thus, when the slide 65 is moved up or down on the'tubular casing 50, it will carry with it the hook 69, the

plates

58 and 59, the pin 61 and the inner rod 53. The tubular guard 48 will be carried along with the rod by reason of the flange or plate 55, and the engagement of the latter'with the pins 60. Thus, the presserfoot may be very quickly raised or lowered and locked in an adjusted position by merely grasping the outer endsof the two catches 66, pressing them together, and raising or lowering them.

When it 1s desired to grind the knives, the

- guard 48 is used as a guide upon which the grinding mechanism may slide as has been prevlously stated. During the grinding operation, the presser-foot is lowered into engagement with the base and the rod 53 is moved down still farther, lower side of the presser-foot into the recess 54 of the base to lock the lower end of the guard against sidewise movement. To

and out of the.

7 0 adapted to cm .60 slrdemay move vertically on the guard 48 and be guided thereby. The guard is nonarraaes and 59 and pivotally secured upon the lower pin which passes through the outer slot 56 of the plate 55. Depending from the yoke is a hook part 71 adapted to engage beneath 65 and the guard 48 and rod 53 'are lowered fore it reaches this position, the Presser-foot '49 will have engaged with the upper surface ,of the base 40. Further movement of the guard 48 and the plate or flange 55 is then impossible. By pressing down on-the handle portion of the hook 69,-.the plates '58 and 59 will {be lowered against the action of the spring 64 and the rod 53 will be moved down-' wardly in respect to the guard and into the .socket 54.- -When the hook 71 engages with the shoulder on'the bracket" 52 as shown in Fig. 11,th e lower end of the rod will pro'-- ject into the base and the spring 64 will be" under compression. The grinding operation may now be carried on as will be pointed out more particularly hereinafter. When the grinding operation is completed, the catch 71 may be disengaged and the spring 64 will lift the rod up out of the base. 40. By merely lifting up on the handle of the hook 69, said hook will bedisengaged and the .guard and presser-foot will be raised until the hook l 69automatically engages with the slide 65.

The presser-foot will then be in the exact from oneIsurfacethereof and including the position from which it was removed prior to the grinding operation. Thus the presserfoot automatically comes back to the same identical position that it occupied before the grindingoperation began and readjustment is unnecessary.

Grinders and carm'ers tkeref0r.For grinding the knife, I provide two stones 74 preferably of yfrusto-conical form and mounted tofirotate' about horizontal axes upon opposite sides 'of the knife blade. Each grinder stone'74is mounted on a shaft 75 which latter has adriving pinion 76 as shown in detail in 25. The two shafts are'journaledin a circularplate 77 which latter has-lugs or shoulders 78 extending out bearingsfor'the shafts 75. This plate is shown particularly in Fig. 27. The outer surfaces ofthe two lugs or shoulders 78 are concentric-with the plate and serve as bearings for supporting the latter. A slide 7 9,

shown particularly in Fig. 29, has a vertical passageway 80 'therethrough' whereby the l circular in cross section and in fact prefertated about its horizontal .78. The lugs are thus held "vide a gear wheel 84shown Fig. 26. This gear wheel has an series of internal gear teeth 86 adapted to form of. anti-friction bearings such as. rollers or balls. 'At the lower 'end of the assageway 80 are two curved arms 81 w ich rece ve the lugs 78 and provide bearings for said lugs whereby the plate 77 may be ro axis. For locking the plate in adjusted position in respect to the slide79, the. curved arms 81 are preferably provided with slots 82 through which may-extend set screws 83 carried by the lugs between the curved arms 81 and upon opposite sides of. the pasageway 80 so thatthe guard 48 may move vertically between the lugs 78. The

grinder stones come adjacent to the outer ends of the lugs 78 and at one side of the slide 79, while the pinions 76 come adjacent to the opposite surface of the plate 77.

. 'Forsimultaneously rotating the pinions and grinders in opposite directions, I proparticularly in annular recess or chamber 85 in one end thereof adaptedto receive the body portion of the 'plate 7 7 so that the latter may constitute a hearing or support for the gear wheel. In termediate of its ends, the gear wheel has a A mesh with the two pinions 76 which have their: axes eccentric in respect to the axis of. the gear wheel 84. This arrangement of the pinions within the gear is clearly shown in Figs. 3 and 24. For holding the gear on its supporting plate 77, any suitable retainer may be employed. As shown, I employ a flange threaded collar 87 shown particularly in Fig. 28. This collar has threaded engagement with the exterior of the gear wheel 86 i and its flange engages with the .outer surface of the plate 77. The collar may be locked so that it cannot become accidentally ungear teeth 88 arranged on a bevel on the end opposite tothe recess 85 and these are designed to mesh with a bevel pinion 89 mount- .ed on a shaft 90 journaled in an opening 91 in the slide. j The'shaft is held against longitudinal movement in respect to the slide so that by moving the shaft longitudinally, the slide 79 may be moved up and .down the guard and power may at all timesbe trans- 12o mitted from the shaft 90 through the pinion 89, gear teeth 88, gear teeth 86 and pinions 7 6 to the grinders. These grinders, as previously stated, are disposed upon opposite sides of the plane of the knife 45. In the specific form illustratedin the drawings, these grinders have their axes substantially horizontal and at right angles to the direction of movement of the knife. It is of course evident that this particular angularity is not essential and that the axes of the grinders may extend at various different angles in respect to the vertical. If their axes are not horizontal, a corresponding change would of course be made in the inclination of the faces of the

gears

88 and 89.

They are also preferably frusto-conical in form. \Vith the plate 77 rotated to bring the axes of the shafts 75 on the same horizontal plane, the two grinders will be at a maximum distance from the plane of the knife blade. By loosenin the set screws 83 and rotating the plate 7 in the slide 79, one shaft 75 will be raised and the other lowered and at the same time the two grinders will be brought toward the plane of the knife. Thus, as the grinders wear away, they may be readjusted so as to properly engage with the knife and likewise as the knife wears away, the same character of adjustment will bring the grinders into proper operative position, due to their frusto-conical form.

Grinder driving, raising and lowering machanism.-Directly above the slide 79 I provide means for rotating the shaft 90 and 9 simultaneously moving it endwise. This mechanism includes an automatic governor whereby the endwise movement of the shaft will carry the slide down until'the grinders reach the lower end of the knife and will then automatically reverse and raise the slide until thegrinders are above the upper end of the knife. The power transmitting mechanism is then automatically disconnect ed with the slide in its original raised position and with the grinders above and out of the path of the knife. This mechanism is shown particularly in Figs. 7, 8 and 9, while its connection to the source of power is shown in Fig. 3.

Rigidly connected to or integral with the main frame of the machine is a bracket 93 constituting a support for the shaft 90 and a casing for the gears, whereby the shaft is rotated. The shaft 90 is of a length somewhat greater than the range of movement of the grinders. It is threaded throughout the whole or a major portion of its length and engages within an internally threaded passageway through the bracket 93 so that any rotation of the shaft 90 isv accompanied by a corresponding endwise movement. The pitch of the threads is comparatively small so that the endwise movement is slow as compared to the speed of rotation. Mounted within the bracket 93 is a gear wheel 9i, in the form of an annulus or ring, having an internal set of gear teeth 95 and a set of beveled gear teeth 96 at one end. The gear wheel 9 is eccentric in respect to the shaft 90 but encircles the same and the shaft 90 carries a pinion 97 which may mesh with the internal gear teeth 95. The pinion 97 is slidable lengththe gear wheel 94 .tated and engage wise of the shaft 90 irrespective of the threads on the latter but is held against rotation in respect to the shaft by a suitable key engaging in a keyway cutlengthwise of the shaft.

Parallel to the shaft 90 is a rod 98 which has a pinion 99 rigidly secured thefeto. The pinion 99 meshes with the pinion 97 and is kept at all times in mesh therewith by means of arms 100 journaled on the rod 98 and engaging with the upper and lower sides of the pinion is moved endwise, 1t will carry the

pinions

99 and 97 endwise and without rotation of either the shaft 90 or the rod 98.- The pin- 97. Thus as the rod 98 i ion 97 is normally disposed above the gear wheel 9 f as is shown in Fig. 7 and the pinion 99 is of such size that it never intermeshes with the internal gear teeth 95, but may freely slide through the gear wheel 94 without cont-acting therewith.

Rigidly secured to the rod 98 at a short distance above the pinion 99 is a second and slightly larger pinion 101 which is of such size that when the rod 98 is moved endwiseto the proper extent, the said pinion 101 may mesh with the internal gear teeth 95. By means of the pinions 97 99, and 101, the shaft may be rotated in either direction from the gear wheel 94:. The latter is driven in any suitable manner as, for instance, by means of a bevel pinion 102 meshing with the bevel gear teeth 96.

The transmission of power from the gear wheel 94 to the shaft 90 is accomplished substantially as follows: The parts normally occupy the position indicated in Fig. 7 and may freely rotate without the transmission of power to the shaft 90. When it is desired to grind theknife, the rod 98 is moved endwise, either manually or automatically, as will be hereinafter pointed out, and the pinion 97 is brought into mesh with the internal gear 95. The parts will then occupy the position indicated in Fig. 8 and the shaft 90 will be rotated in the same direction as the gear 94:. The pinions 97 and tating of the shaft 90 causes it .to move endwise and lower the grinder carrier and grinders and cause the grinders tv be rowith the knife. When the grinders reach the lower end of the knife, the ,rod 98 is depressed still further, that is, to the position shown in Fig. 9. Now the pinion 101 will mesh with the internal gear 94 to rotate the rod and the rotation of the latter will transmit motion to the shaft 90 through the

pinions

99 and 97 and cause the shaft 90 to rotate in the opposite direction to that of the gear 94. This will screw the shaft 90 back and raise the grinders upwardly along the knife. It will be noted that the grinders operate equally well in respective of their direction of rotation and ravages any upward or downward movement of the slide carrying the grinders will be accompanied by a corresponding rotation of the grinders. Due to the fact that the gear wheel 84 is materially larger than the grinders, thelatter will rotate at a speed materially greater than that of the shaft 90.

Automatic gear shifter for raising and lowering the grandam-Although in some constructions I may operate the rod 98 by hand, I preferably employ automatic mechanism for depressing the rod 98 to its lowermost position when the grinders reach the lower end of the knife and automatically raise it to its highest position and disengage the gears when the grinders have completed their upward or return movement .along the knife blade. is shown particularly in Figs. 7 to 9 incluslve.

The shaft and the rod 98- extend to a considerable distance above the gear casing or bracket 93 and on these upwardly projecting ends is mounted the automatic controller for effecting the shifting of the gears. The shaft 90 has two

collars

103 and 104 rigidly secured thereto. The collars are preferably threaded on the shaft so that they may be axially adjusted to the proper position and they are provided with set screws or other locking means for holding them against any accidental rotation in respect to the shaft after they are once adjusted to the proper position. The lower collar 103 has a beveled or frusto-conical lowerend 105 and an annular flange 106 at its upper end,'while the upper collar 104 has an annular flange 107 at its lower end and a frusto-conical upperend. The rod 98 has two

collars

109 and 110 rigidly secured thereto and between these collars are two collars 111 and112 each capable of movement lengthwise of the rod. A coil spring 113 tends to keep the collar 111 spaced at a predetermined distance above the collar 109 and a coil spring 114 normally presses the collar 112 downwardly from the collar 110 and against a stop 115. Each of the

collars

109, 110, 111, and 112 have outwardly extending annular flanges thereon, the flanges of the two collars 111- and 112 being adapted to engage with the flanges of the

collars

103 and 104. The flange of the collar 111 is always below the'flange 106 and the flange of the collar 112- isalways above the flange 107. a

The collars andsprings are preferably inclosed within a casing 116 and adjacent to the upper and lower ends of this casing are two pivoted

dogs

117 and 118. The dogs have limited swinging movement in respect to their supports and are so-designed as to act as stops for certain collars and be tripped by other collars. The lower dog 117 has one end normally projecting into the path of the flange on the collar-l0 SQthat it acts as One form of such mechanism downward movement.

The instant the collar 109 a stop for said collar and limitsgthe downward movement of the rod 98. The opposite end of the dog 117 lies in the path of the conical end' 105 of the collar 103 so that as the collar 103 moves downwardly, it will swing the dog out of the path of the flange on the collar 109 and permit further endwise movement of the rod 98. The dog 118 likewise acts as a stop to limit the upward movement of the collar 110 untilfthe upward movement of the collar 104. causes the conical end 108 to tilt the dog 118 and release the collar 110.

The operation of this automatic controller is substantially as follows: With the parts in the position shown in Fig. 7, the operator may press down on a button 119 at the upper end of the rod 98 until the parts come to the position shown in Fig. 8. He is prevented from pushing the rod 98 past this position as the collar 109 engages with the dog 117. At this time, the gear 97 will come into mesh with the gear 94 and the stones will begin rotating and will begin their This endwise move-' ment of the shaft 90 will cause the collar 103 to engage with collar 111 and compress the spring 113. The parts are so adjusted that when the grinders reach their lowermost position, the spring 113 will be under compression and the conical end 105 of the collar 103 will engage with the dog 117 to tilt the latter and release the collar 109. is released, the spring 113 will force said collar downwardly and as the collar 109 is rigid with the'rod 98, the latter will be moved downwardly and the gears will be shifted. The parts will then be in approximately the positions indicated in Fig. 9. As the shaft 90 begins rotating in the opposite direction, the

collars

103 and 104 will move upwardly but the collar 110 will be prevented from moving upwardly due to the fact thatit is now below the catch 118. The collar 104j'in its upward movement will engage with the'collar 112 and press the spring 114 until the conical end 108 of the collar 104 engages with and releases the catch 118. At the time of this release, the spring 114 will be under compression and'therefore the collar 110 will instantly move upwardly to the limiting positionwhichcarries the rod 98 from its lowermost position, as shown". in Fig. 9, up to its uppermost position, as shown'in Fig. 7 The gears will now be;out of mesh and the shaft 90 and grinders will cease rotation with the grinders aboveand out of the path of the knife.

the -rod 98in its various adjusted positions,

any suitable means may be employed. I have illustrated the rod 98 as being provided with a series of recesses 120 and have" I shown a spring pressed ball which may .130

guide.1n order to 1 ticularlyiiin Fig.

enter the opposed recesses when the rod is moved endwise to the desired position. These recesses are so positioned and the spring behind the ball is of such tension that the rod is held steady in any one of its three positions to which it may be moved. The spring ball does not prevent the rod. from being readily movedendwise by hand .or by the

springs

113 and 114 as above de- 1 It will be noted that all the operscribed. ator has to do is to press the button downwardly as far as it will go, which will merely bring it to the intermediate position. No further action is necessary as the rod will be automatically moved to the lowermost position when the grinders reach the lower end of the knife. This automatically shifts the gears and starts the upward movement of the grinders and when they reach their uppermost position, they are automatically disengaged and the parts are stopped in their original position. No skill or expert knowledge of any kind is required on the part of the operator as the initial pressing of the button is all that is required.

Control of gears from the grinder transmit power from the motor to the gear 94, provide a suitable gear train. This may, under some circumstances, be so designed as to remain continuously in mesh and the gear 94. continuously rotate even though the grinding operation is not being carried on, but preferably I provide means for disconnecting the power between the motor shaft and the gear 94 except when it is desired to operate the grinder.

As shown, the bevel pinion 102 is mounted on a shaft 124 which latter has a pinion 125 keyed thereto and This pinion is normally in the position indicated in Fig. 3, but may be moved endwise so as to come into mesh with a gear 126 mounted on the main shaft 127 of the motor. A suitable gear shifting device is provided which is automatically operated upon the lowering of the presser-foot into engagement with the base and the lowering of the rod 53 into the base so as to hold the presser-foot and permit the guard to serve as a rigid-guide for the grinder. This automatic connection is illustrated particularly in Figs. 4 and 5. A bell-crank lever 128 is pivoted on a bracket 129 and has one end in the form of a yoke 130 engaging with a collar connected to the pinion 125.. The opposite end of the lever 128 has two

arms

131 and 132 disposed adjacent to one side of the guard 48. Either the guard 48 or the rod 53 has a pin 133, shown particularly in Fig. 5, which may pass the end of the arm 132 and engage with the arm 131 to swing the levp: and shift the pinion into mesh ,Wl ,l1 the ar 126, as is shown par- The pin is so positioned Thus,

. sprin separate operations are slidable thereon. 4

the pinion will be moved out of mesh and when the parts reach the posltion shown in Fig. 3, the pin is free from the lever and may continue to move upwardly as far as desired.

In order to normally look the gear shifting lever 128 in normal position, I provide a spring 134 which has an opening or recess therein adapted to receive a pin 135 on the lower arm 131 of the gear shift lever. when the parts are in the position shown in Figs. 3 and 5, the gear is locked against movement. Either. the end of the pin 133., or the upper end of the 134, or both, are the pin passes the end of the arm 132 and approaches the arm 131, it will engage with the spring and press the latter back and release the pin 135 so that the arm 131 may move downwardly.

In operation, it will be noted that the lowering of the presser-foot to the base and 3O shift lever beveled so that as i the locking of it in position automatically shifts the pinion into mesh and the return or upward movement of the presser-foot automatically moves the parts out of mesh. The gear shift lever is normally locked but is unlocked at the instant it is desired to move it and the guard may be adjusted to lock the presser-foot in any desired position, except the lowermost position, with out operating thegear shift lever.

The machine may be so necessary. to start the grinders in action; first, the lowering of the presser-foot guard to the base and the locking of it in position, and second, the pressing down on the button 119 to bring the pinion 97 into mesh with the gear 94. It will be noted that if the operator endeavors to perform the second operation before performing the first, no damage transmission of power is broken between thepinion 125 and the gear 126 until after the presser-foot has been lowered and locked. Therefore, it is immaterial which of the two operations is performed first, although preferably the presser-foot should be lowered before the pinion 97.

In order to avoid the necessity for performing two separate operations to start the grinders, I may provide means for. antomatically shifting the pinion 97 into mesh upon the lowering of the presser-foot and the locking of it in position. I have illustrated such an automatic controlling device inFigs. 2, 30 and 31.

The guard 48 at its upper end is probuilt that two will be done and the grinderswill not be started. This is due to the fact that the the presser-foot rod 53 is raised, the dog the knife to operate or looking it againstv awaess the pinion 97 into mesh. In order to per-.

mit thereturn movement of the rod when the gears are shifted'to raise thegrinders, I provide an automatic release for the dog 139. Asishown, a pin 140 is mounted to slide vertically in the bracket 13 8 and it has an enlarged portion normally engaging with the end of the dog 139 to prevent the swinging movement of the latter as is shown in Fig. 30. A spring holds thepin in this locking position but-when the rod 53 approaches its extreme lower position, it engages with a stop 141 on the casing 116 and lifts the enlarged portion of the pin 140 out of the path of the dog 1'39. Thebutton 119 and'rod 98 may-now freely move. up.- wardly at the instant the collar 104 swings the dog 118 and releases the collar, 110 as is shown in Figs. 7 to 9 inclusive. These parts are so positioned that the button 119 will be depressed to bring the gears into mesh and to permit the spring catch 121 to enter the middle recess 120 at substantially the same time that the pin 140 strikes the stop 141 and releases the dog 139. The dog 139 is normally held in operative position by a spring 143 and the side of the button 119 is of such length that the dog 139 can never get. beneath the button. As soon as 139 swings back into the position shown in Fig. 30, and the locking pin 140 also re-. V

its apertures 153 reg ster with the apertures or'recesses 160 in the shaft and the};

turns to locking position.

Kmfe operating me0hanism.-.The main shaft 126 of the motor is provided with link mechanism whereby the knife 45 may} be reciprocated upon the rotation of the shaft. As'I have previously pointed out, if may in some machines desire to lock the knife against reciprocation while it is being sharpened and in others I may desire to permit the knife to continue reciprocating during the sharpening operation. This will depend in part upon the character of the edge which it is desired to produce on the knife and "the character of the material to be cut. The machine may be so constructed that the knife will always reciprocate while being sharpened or it may be so dea'gned that the automatic connecting of the grinders to the source of power automatically disconnects the knife from the source of power, or means may be provided within the control of the operator for permitting operation, as desired.

In the specific construction illustrated 5"v particularly in -Figs. l6 to 22 inclusive, the

shaft 127 isprovided with a crank 145, the

latter having a crank pin 146 and arounter-balaneing weight 147. The knife 1s rlgidly secured to a slide 148 held in guides or a dove-tail groove in the frame of the machine and this slide is connected to the crank pin 146 by a connecting link which,

in". some constructions, might be a single 1 piece, but which is illustrated as embodying a further feature of my invention, and as including .two

sections

149 and 150.

, The crank 145 encircles the end of the shaft and is detachably locked thereto. The locking mechanism includes two

collars

151 and 152 spaced apart to hold the crank therebetween and both held against rotation in respect to the shaft. The collar 152 end plate 155. This plate iscarried by a rod 156 extending lengthwise through the extends across the end of the shaft and this collar has openings l53therethrough adapted to'receive lugs or projections154 on an shaft whereby the plate maybe moved to-' I ward and fromthe end of the'collar 152 and may be rotated in respectto thelatter and the shaft 127. Any suitable means may be provided for reciprocating and rotating this rod, but preferably it hasa head 157 at the v opposite end of the shaft 127 and a coil spring 158 engages with this head and with the end of the shaft to normally tend to move the plate 155 toward the collar 152'. The shaft 127 I has :two or more apertures 160 in the portion of theperipheral surface encircled by the crank. and the crank has similar apertures 161'in its inner or bearing surface.

-. The collar 152 is locked to the shaft as,

for'instance, by means of a pin 162 so that.

crank may be rotated so that its apertures may pass through the apertures 153 and '3 each lies partlyin one of the apertures 160 and Partly in one of theapertures'161 so as Y to positively lock the crank against rotation.' When the parts are in this position, as shown in Fig. 16, the crank will be forced to rotate with the shaft and-the knife may' be reciprocated. v. 1

When it is desired to stop the knifebut permit the shaft to continue rotating, the

"rod 156. may bemoved endwise and rotated through a part of a revolution so that the projections 154 may engage with the outer 'surface of the collar 152 but out of alinement with the apertures of the latter. I may, if desired, provide the outer collar with shallow grooves 163 in its outer surface to receive the ends of the projections 154 and retain the plate and its'projection in non-locking position. With the parts in this position, the shaft may freely rotate without moving the knife and the knife may be freely reciprocated independently of any rotation with the shaft. 1

Iv preferably lock the knifeagainst recip- 'rocation and hold 'itin its raised position so that it cannot move while being sharpened. A simple means for accomplishing this result involves the provision of a locking pin or stud 164 on the outer surface of the end plate 155. The link section 150 may be provided with a recess, as shown particularly in Fig. 16, so that when the knife is raised and the crank is "on upperdead center, the rod 156 may be pushed in to simultaneously unlock the crank from the shaft and lock the crank and link rigid in respect to each other. The knife cannot now, be reciprocated as any reciprocation would necessitate a lateral movement of the portion of the link which receives and is locked by the pin or stud 164:.

' In order to prevent the jarring or shaking of the body of the machine by the rapid reciprocation of the knife, I provide means for taking up this jar intermediate of the crank and the knife- This means includes cushioning devices which may be constructed in various different ways and may be mounted at any desiredpoints in the transmission connection. placed as near to the crank as convenient g and therefore in the link rather than-in the slide 148.

As shown, the link section 150 has a recess in its outer surface into which projects an angular terminal portion or head 166 b and the other line section 149. This termiing or restricting .this movement such for instance as two parallel pins 168 passing through the head 166 and entering the upper and lower surfaces of the recess into which i this rejection extends. The cushions may be c any suitable character, but are preferablv double-leaf springs and of a width ap proximately equal to the width of the link 1 sections as shown particularly in Fig. 17.

In order that the grinders may not interfere with the link, slide, or other connecting and driving parts for the knife, I provide an improved form of knife substantially as shown in Fig. 2.. The knife has a substantially straight blade portion throughout the cutting length of the knife,

Preferably, they are y suitable guides may be provided for limitbut at its upper end it has an offset portion 170 in the plane of the blade, but extending upwardly and rearwardly from the cutting ed e. This ofiset portion 170 is disposed 'su iciently far in the rear of the cutting edge itself so that it'may be rigidly bolted or locked to a lug 171 on the slide 148 and the cutting edge of the knife will come entirely in front of said lu and in front of the link section 149. T us, the grinders maybe moved upwardly to a position above the limiting position of the upper end of the cutting edge of the knife, but will not be in any way interfered with by or come in the path of the slide, the link section 149 the connections between them, or the connections with the knife.

lwish to again emphasize the fact that the specific machineillustrated in the drawings and which has been described in detail is only one form which my invention may assume. Substantially all of the details may be varied without departing from the spirit of my invention and various features, together with their functions, may be entirely omitted and other features radically redesigned. The specific construction of substantially all of the various parts may be materially changed in adapting my invention to various makes of'reciprocating-knife cloth cutting machines.

Having thus described-my invention what I claim as new and desire'to secure by Letters Patent is: v

1. A cloth cutting machine including a reciprocating knife, a rotatable grinder adapted to engage therewith and a unitary means for simultaneously rotating said grinder and advancing the same along the length of said knife.

2. A cloth cutting machine, including a knife, a grinder, a source of power, means operated thereby for rotating said grinder. and means also operated from said source of power for moving said rinder along the length of the knife during the grinding action.

3. A cloth cutting machine including a vertically disposed cloth cutting knife, a source of power, means connected thereto for reciprocating said knife, a grinder, means operated from said source of power for moving said grinder up and down along the edge of the knife, and means automatically operated during said up anddown movement for rotating said grinder independently of its engagement with the knife.

4. A cloth cutting machine including an electric motor, a knife, a pair of grinders disposed upon opposite sides of the plane of said knife, a carrier for said grinders, connections between said motor and said carrier for moving the latter in the direction of the length of the knife, and means mounted on from the planeof the knife.

knife, I taneous engagementywiththe' hife, a carrier therefor movable imthe direction of the length of the knife, means foradjusting said grinders on said carrier and toward and from the plane of the knife, and means for rotating said rinders irrespective of their adjusted positibn. 4 7. A cloth cutting machine including a knife, a member movable in the direction of the length of the knife, and a pair of grind-- v ers rotatable about substantially parallel simultaneously engage with the ,opposite.

sides of said knife, a carrier for sa d grmders, means for moving said carrler 1n the d1-' axes andgadapted to engage with opposite sides of said knife and carr ed by said member, said member being rotatable about an axis intermediate of the axes of said grinders for simultaneously adjusting them toward and from the'plane of the knife.

8. A cloth cutting machine, including a knife, a pair of grinders rotatable about substantially parallel jaxes and adapted to rection of the length of the knife, and means their engagement with the knife.

gage with the opposite sides of said knife, a carrier for said grinders, means for moving said carrier in the direction of the length of the knife, means for rotating said grinders independently of their engagement with the knife, and means for adjusting said carrier to simultaneously adjust said grinders toward and from the plane of the knife.

10. A cloth cutting machine, including'a knife, a pair of grinders rotatable about-sub stantially parallelaxes and adapted to en-." gage with the opposite sides of saidknife, a

rotatable carrier for said grinders, means for moving said carrier in the direction of the length of the knife, means for rotating said grinders independently of their engagement with the knife, and means for rotating said carrier to simultaneously adjust said grinders toward and from the plane of the knife: 4

l1. Acloth cuttingm'achine, including a knife, a pair of. grinders rotatable about substantially parallel axes, and adapted to en- 7 v 12. A cloth cutting 6. A cloth cutting machine including a a pair of grinders mounted for simuli 'tially parallel axes at knife, I v upon the rotation of said shaft. for rotatmg said grinders independently of knife 9. A cloth cutting machine, including a knife, a pair of grinders rotatable about sub- I stantially parallel axes and adapted to en-- gage with the opposite sides of said knife, a

carrier for said grinders, means for moving said carrier in the direction of the length of the knife, means for rotating said grinders independently of their engagement with the knlfe, and means for rotatin said carrier about an axls in the'plane o the knife to simultaneously adjust said grinders toward and from the plane of the knife.

' machine including a kmfe, 3 1321 11 of grinders having substana fixed distance apart,

a pinion connected to each grinder, a gear meshing-With both of said pinions for simultaneously rotating them, and a member carryi ng said pinlons and adjustable about the axis of said gear to 'adjustthem simultaneously and to equal distances toward and p from the plane of the knife.

- -13. A cloth cutting machineincluding a knife, a pair of grinders having substantially parallel axes, a pinion connected to each grinder, a gear meshing with both of said pinions for simultaneously rotating them, and a carrier for said grinders rotatable about the axis of said gear to adjust said grinders toward and from the plane of p the kmfe.

14. A cloth cutting machine including a knife, an endwise movable shaft parallel to said'knlfe, a member connected to said shaft and movable endwise therewith, a pair of grinders carried by said member and adapted to engage with opposite sides of the and means for rotating said grinders --15. A cloth cutting machine, including a a'shaft substantially parallel thereto and havinglongitudinal and rotary movement, apair of grinders adapted to engage with opposite sides of said knife, means for rotating said grinders upon the rotation of said "shaft, and means for moving said grinders along the length of the knife upon endwise movement of said shaft.

16. A cloth cutting machine, including a knife, a shaft having rotary and longitudinal movement and disposed substantially parallel to said knife, a grinder adapted to engage with said knife, means for rotating said grinder upon the rotation of said shaft, and meansformoving said grinder along thelength of said knife upon the longitudinal movement of said shaft.

17. A cloth cutting machine including a knife, a grinder for engagement therewith, a member carrying said grinder, a source of power, and means connecting said member. thereto for moving said grinder along the length of said knife and simultaneously rotating the grinder independently of its engagement with the knife.

18. A cloth cutting machine including a base, a verticallly movable knife carried thereby, a grinder for engagement therewithia me1nbe r carrying said grinder, a sourc of power, and means connecting said member thereto for moving said grinder along the length of said knife and simultaneously rotating said grinder.

19. A clothcutting machine, including a knife, a grinder, a carrier therefor, a shaft I substantially parallel to said knife and connected to said carrier, means for moving said shaft and said carrier endwise, and power transmitting connections between said shaft and said grinder for rotating said grinder upon the rotation of said shaft.

20. A cloth cutting-machine, including a knife, a grinder, a carrier therefor, a shaft extending lengthwiseofsaid knife and j ournaled in said carrier, power transmitting connections on said carrier between said shaft and said grinder, and means for simulknife, a member movable lengthwise therei of, a pair of grinders, a member carried by said first mentioned memb'er and supporting said grinders, said second mentioned member being rotatable in respect to the first mentioned member to adjust said grinders toward and from said knife, a gear'carried by said first mentioned member and concentric with the axis of rotation of said second mentioned member 'pinio-ns connected to said grinders and meshing with said gear, andmeans for rotating said gear, said first'mentioned member and the parts carried thereby being movable along the length of said knife.

23. A cloth cutting machine including a knife, a member movable lengthwise thereof, a pair of grinders, a member carried by said first mentioned member and supporting said grinders, said second mentioned member being rotatable in respect to the first mentioned member to adjust said grinders toward and from said knife, a gear earned by said first mentioned member and concen tric'with the axis of rotation of said second mentioned member, pinions connectedto said grinders and meshing with said gear, and means for rotating said gear, and simultaneously moving it in thedirection of the length of the knife.

24. In combination, a knife, a slide including oppositely disposed'curved arms, a plate rotatably mounted" between said arms and adjustable about its own axis in respect to said slide, and a pair of grinders carried by said plate and disposed upon opposite sides of the plane of the knife.

25. In combination, a vertically disposed reciprocatory knife, a knife guard disposed in front of the cutting edge thereof, a presserfoot carried by said guard and adjustable with said guard in the direction of the length of the-knife, a slide movable along said guard, a pair of grinders carried by said slide and adapted to engage with the opposite sides of the knife, a source of power and means operatively connected thereto for simultaneously rotating said grinders and moving said slide along said guard.

26. A cloth cutting machine including a base adapted to pass beneath the material to be cut, a reciprocatory knife, a guard disposed in front of the cutting edge thereof and having a presser-foot normally disposed above said base, and means for locking said Presser-foot to said base to prevent lateral movement of it in respect to said base.

27. A cloth cutting machine including a base adapted to pass beneath the material to be cut, a reciprocatory knife, a guard disposed in front of the cutting edge thereof and having a presser-foot normally disposed above said base, and means for looking said presser-foot to said base to prevent lateral movement of said presser foot in respect to said base after said presser-foot has been lowered into engagement with. said base. 28. A cloth cutting machine including a base adapted to pass beneath the material to be cut, a reciprocatory knife, a guard disposed in front of the cutting edge thereof and having a presser-foot normally disposedabove said base, and a member movable lengthwise of said guard and adapted to engage with said'base' to prevent lateral movement of said presser-foot and the lower endof said guard.

29. A cloth cutting machine having a base, areciprocatory knife, a guard in advance of said knife, a grinder movable lengthwise of said guard, and means for ocking the lower end of said guard to said ase.

vance of said knife, a grinder movable lengthwise of said guard, and means for 80. Acloth cutting machine having a. base, a reciprocatory knife, a guard in admasses knife and vertically movable in respect to respect to said guard for engagement with said base, and a grinder for said knife j mounted to move up and down along said guard.-

34. A cloth cutting machine, including, a

' base, a'knife, a guard in advance of said knife, adjustable toward and from said base,

a locking rod normally movable with said guard but movable in respect to said guard to lock with said base when said guard isfin lowermost position.

35. A clothcutting machine including a base, a knife, a guard in advance of said knife, a locking rodcarried by said guard,

means for normally preventing movement of said rod in respect to said guard, and means for lowering said guard and rod toward'said base and thereafter further lowering said rod-into said base.

.36. A cloth cutting machine including a base, a knife, a guard in advance of said knife, a rod d sposed within said guard and having a limited longitudinal movement inrespect thereto, means for normally holding the rod in its upper limiting position in respect to the guard, and means for lowering the guard toward said base, said meansopcrating to lower'the rod in respect to the guard when the latter reaches its lowermost position.

v37. A cloth cutting machine including a base, a knife, a presser-foot, a carrier therefor movable toward and from said base, and a locking member carried by said carrier I and normally movable therewith and having a limited relative movement in respect thereto, and means for producing said relative movement when the presser-foot and carrier are in the lowermost limiting position.

base, a knife, a presser-foot carrier movable toward and from said base, a rotatable grinder mounted to slide along said carrier,

means for transmitting power to the grinder and means for preventing the transmission of power to the grinder save when the presserfootlis in a. predetermined position.

39. A cloth cutting machine including a base,'a knife, a resser-foot carrier movable toward and from' said base, a rotatable grinder movable. along the length of the knifeand slidable on said carrier, means for transmitting I power to the grinder and means for preventing the transmission of power to the grinder save when the presserfoot is in its lowermost limiting position,

base, a knife, a presser foot carrier. movable toward and from sald base, a grinder, means 38. A cloth cutting machine'including a.

40. A cloth cutting machine including a base, a knife, a'presser-foot carrier vertically shdable toward'and from said base, a

. grinder movable along said knife, a source moving said grinder along the edge of the knife, and means for preventing the transmission of power to said first mentioned means save when said carrier is in a predetermined position.

42. A cloth cutting machine including a for moving said grinder along the edge of the knife, and means for .preventing the operation of said first mentioned means save when said carrier is in its lowermost limiting p sition. Y

A3. A cloth cutting machine including a base, a knife, a resser-foot carrier movable toward and from said base, a grinder, a source of power, normally inoperative power transmitting connections between said source .of power and said grinder for rotating the latter, and means for automatically rendering saidconnections operative when said presser-foot'carrier is moved to a predetermined position. 4a. A cloth cutting machine including a base, a knife, a presser-foot carrier movable toward and from said base, a grinder, a source of power, normally inoperative power transmitting connections between said source of power and said grinder for moving the latter along the length of the knife, and means for automatically rendering said connections operative when said presser-foot carrier is moved to a predetermined position. 45. A cloth cutting machine including a base, aknife, a presser-foot carrier movable automatically engaging said clutch upon the movementof said carrier to a predetermined position.

46. A cloth cutting machine including a base, a knife, a presser-foot carrier movable toward and from said base, a grinder movable along said carrier and means for looking said carrier to said base, said grinder being inoperative save when said. carrier is locked to said base.

4.7. A cloth cutting machine including a base, a knife, a resser-foot carrier movable toward and from said base, a grinder movable along said carrier, and means for simultaneously locking said carrier to said base and transmitting power to said grinder.

l8. A cloth cutting machine includin a base, a knife, a presser-foot carrier mova le toward and from said base, a grinder mov-. able along said carrier, and means for simultaneously locking said carrier to said base and causing said. grinder to move along the length of the knife.

49. A cloth cutting machine includinga base, a knife, a grinder carrier movable 1n the direction of the length of the knife, a grinder carried thereby, and a shaft parallel to said knife and connected to said carrier and rotatable to rotate said grinder and movable endwise to raise and lower said carrier. A

50. A cloth cutting machine including a base, a knife, a grinder carrier movable in the direction of the length of the knife, a

grinder carried thereby, a shaft parallel tosaid knife and connected to said carrier and rotatable to rotate said grinder, and a bear-' ing having threaded engagement with said shaft whereby the latter and said carrier are moved endwise upon the rotationof the shaft.

' 51. A cloth cutting machine including a base, a knife, a grinder carrier movable in the direction of the length of the knife, a.

grinder carried thereby, a shaft parallel to said knife and connected to said carrier and rotatable to rotate said grinder, a bearing having threaded engagement with said shaft whereby the latter and said carrier are moved endwise upon the rotation of the shaft, and means for automatically revers -allel to said knife, for rotating said grinder,

said shaft being connected to said grinder and longitudinally movable to carrysaid grinder along the length of the knife, and means for automatically reversing the direction of endwise movement of said shaft when said grinder reaches a predetermined point.

54. A cloth cuttingmachine including a knife, a shaft extending substantially par allel thereto, a grinder connected to said shaft, means. for rotating said shaft and moving it endwise in one direction for a limited distance, and means lfor rotating it in the opposite direction and moving it endwise in the opposite direction for a predetermined distance. a

55. A cloth cutting machine including a knife, a grinder therefor, a drive shaft therefor, mounted for rotating and longitudinally moving said grinder, gear transmission mechanism for rotating said shaft in either direction, and means controlled by the predetermined endwise movement of the shaft for reversing said gear transmission mechanism. i

56. A cloth cutting machine, including a knife, a grinder, a shaft rotatable to rotate said grinder and longitudinally movable to vary the position of the grinder along the knife, gearing fortransmitting power to said shaft, a member movable longitudinally to connect said gearing for rotation of the shaft in one direction and automatically movable to, reverse the direction of power transmission after a predetermined endwise movement of said shaft.

57. In combination, a knife, a grinder, a shaft connected thereto and mounted for simultaneous, longitudinal and rotary movement, a driving gear, two power transmitting connections between saidshaft and said gear, one operating for a rotation of, the

shaft i one direction and the other for a rotation of the shaft in the opposite direction, and a longitudinally movable rod for bringing said, power transmitting connections into operation in succession.

58. In combination, a knife, a grinder, a shaft connected thereto and mounted for rotary and longitudinal movement, a source of power, power transmitting connections between said source and said shaft, and a member for automatically reversing the direction of longitudinal movement of said shaft after a predetermined movement in one direction and thereafter breaking the power transmitting connections after a predetermined movement of the shaft in the opposite direction.

59. A cloth cutting machine including a:

knife, a grinder therefor, a guide for "said grinder, normally'disengaged power transmitting mechanism ;for said grinder, and means for simultaneously locking said guide in position and engaging said power transmitting mechanism. I

' 60. A cloth cutting machine including a knife, a grinder therefor, a guide for said grinder mounted to slide in the direction of the length of the knife, normally disengaged power transmitting mechanism for said.

grinder, and means for lowering said guide and automatically engaging said power transmitting mechanism. e

61. A clothcutting machine including a base adapted to slide beneath the cloth to