US1815018A - Cloth cutting machine - Google Patents

Description

July 14, 1931. A. e. WAGNER 1,815,018

CLOTH CUTTING MACH-111E Filed March 8. 1929. 3 Sheets-Sheet 1 3 v 5 e 5! 1, 69 3 as 52 19 17890 7o m we an 52 35 .18 85 as 1 I15 a 8L\ y 14,1931- I A.G. WAG ER 1,815,018

' v CLOTH CUTTING MACHINE I Filed March 8. 1929 3 Sheets-Sheet 2 July 14, 1931. ER 1 ,815,018

CLOT H CUTTING MACHINE Filed March 8. 1929 3 Sheets-Sheet 3 /NVEN TOR: v

Patented July 14, l93l UNITED STATES PATENT OFFICE ALBERT G. WAGNER, OF CINCINNATI, OHIO, ASSIGNOR TO THE WOLF MACHINE COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO CLOTH CUTTING MACHINE Application filed March 8, 1929.

in my application for Letters Patent of the United States on improvements in cloth outw ting machines, Serial No. 27 8,359, filed May It is the object of my invention to provide new and improved means for driving the gearing which rotates rotary grinding means; further, to provide novel means for guiding the grinder-head lengthwise of the path of reciprocation of the knife; further, to provide novel means for supporting the grinderhead; further, to provide novel means for rtating the grinders and for axial movements of the same for coaction with the knife; further, to provide novel control means for the grinders; further, to provide novel means for mounting the grinders; further, to provide novel gearing for rotating the grinders and means for mounting the same; further, to provide a novel arrangement of presser-foot stem and driving means for the grinder; and; further, to provide novel means for guiding the grinders on the standard lengthwise of the path of reciprocation of the knife.

The invention will be further readily understood from the following description and claims, and from the drawings, in which latter:

Fig. 1 is a side elevation of my improved device, showing the same in connection with a stack oflayers of goods or fabric, the latter shown in dotted lines and partly broken away.

Fig. 2 is a front elevation of my improved device.

Fig. 3 is an axial section of my improved device, taken on the line 33 of Fig. 2, and partly broken away, the means for holding the grinder-head in retracted position being shown in holding relation in full lines and in release relation in dotted lines.

Fig. 4 is a vertical section taken in the 1 plane of the line 44 of Fig. 3, partly bro- Serial No. 345,514.

ken away, with the front cover and top cover removed, and showing means for reciprocating the knife.

Fig. 5 a horizontal section of my improve-d device, taken in the plane of the line 55 of Fig. 3, and partly broken away.

Fig. 6 is a horizontal section of my improved device, taken on the irregular line 66 of Fig. 1, partly broken away.

Fig. 7 is a front elevation of the same, with the standard removed, and the'shield for the grinders shown in section on the line 7-7 of Fig. 6.

Fig. 8 is a horizontal section of my improved device, taken on the line 88 of Fig. 2. 1

Fig. 9 is cross-sectional detail view, taken in the plane of the line 99 of F 8; and,

Fig. 10 is a perspective view of the closing plate. 7

The cloth cutting machine exemplified comprises an electric motor 21, having a rotor. provided with an axle 22, journaled in suitable bearings in the motor casing 23, and hav ing a crank-wheel 24 fixed thereto provided with a crank-pin 25. and 4.) A usual base 27 is arranged to travel on a usual table surface 29, on which the layers of cloth are laid or piled, such pile of layers of cloth being indicated at 30. A usual standard 31 extends upwardly from the traveling base, the motor casing being mounted in suitable manner at the upper end of the standard. The standard is provided with a groove 32 in which the knife 33 is guided and arranged to reciprocate. (Figs. 3, 4 and 8.) The knife is suitably secured at its upper end to a cross-head 34, which reciprocates up and down in guideways 35 on an apron 36, which may be part of a housing 37 on one of the ends of the motor casing. (Figs. 1, 2, 3, 4 and 5.) These guideways are adjustable in suitable manner.

The connection between the cross-head and the reciprocating knife may be made by providing the cross-head with a lug 38, in which a clamping screw 39 is threaded, the clamping screw being received in a slot 40 in the upper end of the knife, for releasably attaching the knife to the cross-head, (Figs. 3

(See Figs. 1, 2, 3

and 4). A connecting rod 41 has a bearing 42 about the crank-pin and a bearing 43 about a. pin 44 suitably secured to the crosshead.

' The knife 33, as usually constructed has a front lengthwise cutting edge 45, from which side bevel faces 46 extend rearwardly, and

an end cutting edge 47 at its bottom, pref: lv als h g imil r b ve face extending upwardly therefrom. (Figs. 1;

and i I have devised novel knife sharpening means for a machine of this character,'which are mounted and retained on the machine, and are arranged to sharpen the knife while in the mchine, and preferably while the knife is reciprocating, and I have provided such means of compact arrangement, so that full view of the goods being cut and of the 00- action between the cutting knife and the goods is retained by the operator, so that the operator may readily follow the marked lines on the pile of goods for cutting the pattern, and may, when the knife becomes dull, quickly withdraw the machine from the goods and sharpen the knife with little consumption of time, and then proceed with the cutting operation.

In the present exemplification I provide grinding means which comprise a pair of grinding wheels 51, which have one grinding faces 52, which are complemental to the side slanting faces of the front cutting edge of the knife. (Figs. 3, 7 and 8).

The grinding means are mounted on a head 53., which is arranged to move in the direction of length of the knife. The rotary grinch ers are rotated from a rotative element of the cutting machine, exemplified as the crank- QQ wheel 24, with which a friction wheel 54 coacts. (Fig. 3). The crank-wheel and the friction wheel have complemental contact driving faces 55., 5.6, for rotating the friction wheel.

The friction wheel has a friction disk 5.7 secured to. a supporting disk 5.8 extending integrally from a hub 59.

The crank-wheel and the friction wheel form a pair of drive-wheels for a shaft 61.

5.6 The shaft 61 comprises telescoping sections 62 63., which are rotatively connected. 3, 5i and 6:). The section 63 is journaled in' a bearing 65 in the head 53, and has a bevel pinion 66., fixed thereto, this section movin 5. lengthwise with the head. The bevel pinion 66 meshes with a bevel pinion 6'1" rotatable about a stud 68 on a stud-block 69 fixed in the head. (Figs. 8 and 9 The stud-block and the pinion are located in a cavity 70 in the 9; head.

The stud-block has a threaded shank 'Z 5 re-. ceived through a hole 76 in the front wall 77' of the head. (Figs. 3., 8 and 9). The. studblock is provided with a shoulder '58, a nut 79 5 being threaded to the threaded reduced end for clamping the stud-block to said front wall between said shoulder and said nut. The upper portion of the stud-block is cut away, as shown at 80, for clearance for the bevel pin- 1OI1S.

The said cavity forms a lubricant container and is closed by a closing plate 81. (Figs. 3., 8, 9. and 10). This closing plate has a lower p rti n re eive ag n t the e eads of the front wall 'Z'i and the side walls 82, 83, of the cavity, being secured to said walls by screws 84, The closing plate also has an upwardly extending portion received against the rear ends of the side walls 82, 83. It is provided with a hole 86 in which the hub 87 on the pinion 67' is located. The closing plate holds the pinion 6.? in mesh with the pinion 66.

A drive wear 91 rotates with the bevel pins. ion 67. It is shown received on the hub. of said bevel pinion, being keyed thereto by a key 92. This drive-gear is shown as a friction wheel.

Brackets 95, 96, extend rearwardly from the head, and are shown releasably secured to. the head by screws 97 (Figs. 1, 6, 7 and 8). Each of these brackets comprises a hear: ing 98, shown as a clamp bearingclamped by a screw 99. A threaded sleeve 101 is adjustable endwise in the bearing, and is arranged to be clamped in adjusted positions by the clamping of the bearing. This sleeve forms a bearing for a tubular shaft 102 of a driven gear 103., shown as a friction wheel, comple-. mental to the friction wheel 91. The endwise adjustments of the sleeves 10.1 at the respecknife. The grinding wheels are received in 1 end recesses 106' in the driven gears 103. Con. nection between the tubular shaft and said stem is shown accomplished by means of a )in 107 in the tubular shaft received in a slot 08 in the stem 7 and 8).

The means for controlling coaction between the grinding wheels and the knife are shown as a bow-.part- 111, which is slidable laterally in a guideway 112 in the head, and held in said guideway by a plate 113 secured to the head byscrews 114. (Figs. 6, 7' and 8.) This bowpart is provided with arms 115, 116, provided with contact- parts 117, 118. These contact.parts are arranged to contact the ends of'the stems 105. The bow-part is also shown provided with a handle-portion 119. The operator grasps the handle-portion for moving the grinding wheels endwise and also for moving the grinder-head up and down along the knife.

ill;

' The plate 113 is bent about the upper portions of the grinding wheels and driven friction gears and forms a shield for said wheels and gears. (Figs. 1, 3, 6 and 7). It is provided with a slot 121 forming wings 122 at the respective sides of the standard 31. The walls of said slot are formed, as at 123, to make contact with the sides of the standard, for guiding the head in the up and down movements of the head and for preventing turning of the head.

The grinding wheels are preferably presented at an angle to the knife at the respective sides of the knife. The shanks thereof preferably slant laterally and forwardly away from the knife, and preferably also slant slightly laterally and downwardly away from the knife. (Figs. 3, 6 and 7.) This presents closest approach between the lower forward edge of the end grinding face to the knife at each side of the knife for grinding the side bevel faces of the cutting edge of the knife and enabling a sharp cutting edge to be produced on the knife.

This relation of the parts also creates a tendency in the grinding wheels to recede from the knife during rotations of the grinding wheels, the grinding wheels during rotation moving automatically away from the knife when released.

There is a front cover 127 received about the crank means, pitman and cross-head. The front cover is releasably secured to the apron 36, as by means of screws 128 received through holes in flanges 129 of the cover and threaded into the apron (Figs. 1, 2, 3, 4 and 5). A top cover 131 is releasably secured to the front cover, as by means of screws 132 received through holes in the top cover and threaded into the walls of a bulge 133 on the front cover, in which bulge the drive friction-wheel 54 for the grinding means is received. The inner margin of the top cover is received over a rear margin 134 of the front cover, which latter margin is located in a recess in the front top portion of the housing above the crank-wheel 24.

A hearing 137 is received about the lower reduced end 1.38 of the section 62 of the telescoping shaft. This section is held endwise stationary. (Figs. 3 and 5.) This bearing is a split-bearing, the cap thereof being secured to the front cover by screws 139. The front cover is provided with a forward bulge 140 extending up and down, a front web 141 connecting said. bulge with the overhanging bulge 133 of said front cover. The telescoping shaft is located in this front bulge.

The friction wheel. 54 is normally held out of engagement with the drive-wheel 24,

shown accomplished by means of a spring 145 received about the upper reduced portion 146 of the section 62 of the telescoping shaft, the spring being located between an annular shoulder 147 of said section and the hub 59 of the friction wheel 54. (Fig. 3.) drive connection between said friction wheel and the section 62 is shown formed by means of a key 148 received in grooves in said hub and section respectively, the relation of length of the key and grooves being such as to permit axial movement of the friction wheel on the shaft into and out of engagement with its drive friction.

The means shown for engaging the driven wheel with the drive wheel is a sleeve 151, which is movable manually endwise in a bearing 152 in the top cover 131. (Fig. 3.) This sleeve is preferably closed at its top by an upper end wall 153, which is arranged to be engaged by the thumb, fingers or hand for pressing the sleeve downwardly and inter-engaging the driving wheels for the telescoping shaft. It also'forms a steadying means for steadying the machine during the grinding operation, as the pressing down on the sleeve or holding the sleeve while pressing the sleeve downwardly, supports the upper end of the machine for preventing tilting or upsetting the machine while manipulating the grinding device. The machine is thus steadied with one hand while manipulating the grinding means with the other hand. i

The sleeve also forms an upper bearing for the section 62 of the telescoping shaft, which bearing also serves as a bearing support for the inner section 63 of the telescoping shaft for aiding in maintaining said sections of the telescoping shaft parallel with each other and preventing binding between the same. A washer 154 may be located about the section 62 between the sleeve 151 and the driven friction wheel 54.

The grin ding wheels are normally idle, and the friction wheel 54 is also preferably normally idle. The grinder-head is normally held in up-position when out of use, as by means of a latch 156 received under a catch 157 on the grinder-head. (Figs. 1, 2 and 3.) This latch is on a lever 158 pivoted on a pin 159 in lugs 160 on the front cover.

A bow-spring 161 betweenthe end of the lever and an attaching point 162 on the front cover holds the latch in its actuated position, whether in holding relation for holding the grinder head in tip-position or in release relation for permitting the grinder to be moved up and down to full extent. When the latch is in holding relation, the connection 163 between the bow-spring 161 and the latch lever is at one side of a right line between the pivotal axis 159 of said lever and the attaching point 162 of the other end of said bow-spring, and when said latch is in release relation said connection 163 is at the other side of said right line.

WVhen the grinder-head is in tip-position and latched, the upper end of the section 63 of telescoping shaft is in contact with the The sleeve 151, to lock said sleeve against endwise movement downwardly, whereby to prevent engagement between the driving wheels for the telescoping shaft and insuring non-rotation of the grinder-wheels. (Fig. 3.) The extreme upper end of the section 63 of the telescoping shaft is shown engaging the upper well 153 of the sleeve 151 in Fig. 3.

A spline-key 165 is held in a slot 166 in the outer section 62 of the telescoping shaft. This key is received in a spline-groove 167 in the inner section 63 of the telescoping shaft. This groove extends throughout a large portion of the length of the endwise movable section of the telescoping shaft for permitting movements of the grinders in the direction of the length of the knife for grinding the lengthwise edge of the knife throughout its effective cutting length.

The spline-groove 167 preferably terminates in a shoulder 168, which coacts with the key 165 when the section 63 of the telescoping shaft is in its farthest down position, which relation of parts locates the grinders in proper relation for coacting with the lower end cutting edge of the knife. The key 165 is held in its slotby any suitable means, as by peening the wall of said slot in the outer section 62 of the telescoping shaft.

A. presser-foot' 171 is provided for bearing upon the pile of goods during the cutting operation, (Figs. 1, 2 and 8), the presser-foot being providedwith a usual slot 172 for accommodating the knife and standard and forming side toes 178 at the respective sides of the standard which coact with the standard for preventing rotation of the presserfoot.-

The presser-foot is provided with a stem 17 1, exemplified as received in the bore 175 of the driveshaft for the grinding means. (Figs. 8, 5, 6, 7, 8 and 9.) The press'er'foot stem is slidable lengthwise in said shaft, the longitudinal axis of the prcsser-fo-ot stem and the axis of rotation of the shaft being xemplified as coincident.

Means are exemplified for holding the presser-foot stem to locate the presser-foot atv selective points lengthwise of the standard, according to the thickness of the pile of goods being operated on when performing the cutting, or holding the presser-foot in adjacency to the grinder-head when grinding the knife. (Figs. 1, 2, 6, 8 and 9.) The presser-foot stem is received through a hole 176 in the cover-plate 81, a hole 177 in the stud-block 69, and the pinion 66, and is received in the telescoping shaft, having endwise movement in these parts.

The stem is provided with a tooth-rack 1.78,

the presser-foot stem, and is normally in such engagement. An operating lever 181 is pivoted on a. pivot-screw 182 between lugs 183 on the grinder-head, and has an operating end 185 received in a slot 186 in said plug. (Figs. 5, 6, 7 and 8.) A spring 187, the respective ends of which are located in a hole 188 in the grinder-head and in a slot 189 in the lever 181, normally urges said lever for pressing the toothed plug 17 9 into engagement with the rack on the presserfoot stem.

An operating handle 191, (Figs. 1, 2 and 5) extends from a rock-shaft 192 ournaled in a bearing 193 on the front cover 12?. The rock-' shaft is provided with an arm 19% arranged to engage the lever 181 for s 'inging said lever on its pivot and pressing the toothed plug out of engagement with the rack on the presserfoot stem.

A spring 195, the respective ends of which are received in a collar 196 clamped to the rock-shaft by a screw 197 and in a hole in the bearing 193, normally retracts the arm 194 with relation to the lever 181, forming a releasable connection with said lever and permitting the lever 181 to normally press the toothed plug into engagement with the rack. A stop-arm 198 is fixed to the rock-shaft and is arranged to engage the side wall of the front cover for limiting the movement of the arm 194 away from the lever 181.

A handle 201 is fixed to the machine frame for guiding and manipulating the movements of the frame during the cutting operation.

The cutting machine is employed and manipulated in usual manner during the cutting operations. If it is desired to sharpen the knife, the cutting machine is preferably moved away from the cloth, the pressurefoot 171 is raised into adjacency with the grinding means and held in such relation, and the latch 156 is released for ermitting the grindenhead to be moved lengthwise of the knife. The operator in the present exemplification grasps the handle 119 and moves one of the grinding wheels endwise into contact with the knife and at the same time moves the grinder-head up and down along the knife.

Vhen the operator moves the bow-part in one direction, contact is made between one of the grinding wheels and the knife, and when said bow-part is moved in the opposite direction the other of the grinding wheels is contacted with the knife. The gearing, however, throughout such movements remains in mesh so that continuous rotation is imparted to the grinding wheels and so that proper meshing relation is insured throughout the grinding.

In. the meantime the operator with his other hand pushes down upon the sleeve 151 for engaging the friction wheel 54 with the drive wheel 24;, and continues such pressure,

with consequent engagement between the driving wheels throughout the .grinding operation. The operator thus also aids in steadying the cutting machine while the grinding of the knife is taking place. This driving relation between the driving wheels is interrupted. as soon as the operator releases the sleeve 151, insuring that rotation of-the grinding wheels ceases upon completion of sharpening of the knife.

WVhen the grinding has been completed the grinder-head is returned to uppermost position, and the latch 156 is placed in latching relation. This also locks the manually manipulated part or sleeve 151 in release relation, so that the sleeve may be manipulated bythe operator in the handling of the machine without danger of rotating the grinding wheels.

The grinding preferably takes place while the knife is caused to reciprocate. Either side of the knife may be ground, orone side only ground repeatedly, or both sides may be ground, as desired or as the condition of the cutting edge may make advisable.

The grinders, when in lowermost position, coact with the lower end cutting edge of the knife for grinding the latter rearwardly to sufficient extent for proper cutting by the knife.

The grinder-head is in its up and down movements guided by the telescoping shaft and also by side contact of the wings 122 of the shield'113' with the sides of the standard The grinding means and driving means for the same are in the present exemplification mounted upon the cover for the crankwheel, cross-head and connecting rod. Removal of this cover exposes all of these parts for ready attention and care.

The parts on the grinder-head are readily taken apart for attention and replacement or repair. Thus the brackets 95, 96', may be removed by unscrewingthe screws 97, and the grinding wheels and friction wheels on the respective brackets may be readily removed by moving the same endwise out of the sleeves 101, and the sleeves are also readily removed by release of the clamp-bearings 98. The friction wheel 91 is readily slipped off of the hub 87 of the bevel pinion 67 The presser-foot stem may be readily removed endwise from the telescoping shaft and the grinder-head. I

The cover plate 81 is readily removed by unscrewing the screws 84 for removing the same, and the pinion 67 is readily removed from the stud 68. The operating lever 181 is readily moved out of range with the toothed plug 179. Removal of the nut 79 permits ready endwise movement of the stud-block out of the head.

In this manner all of the parts are readily dissociatedfor attention, repair and replacement, and the parts are readily reassembled. The rotating parts are shielded to avoid contact therewith by the operator or the goods.

My improved device is simple in construc- T tion, conveniently and readily repaired and manipulated, and provides means whereby the knife may be readily sharpened for enhancing the cutting capacity of the machine.

-with the frame thereof, of rotary knife grinding means, means for rotating the latter comprising a telescoping shaft substantially parallel with the path of reciprocation of the knife, a drive-wheel for said telescoping shaft, a complemental drive-wheel for the latter, means normally separating said drivei wheels, and manual means for interengaging said drive-wheels, said last-named means including a manually movable part in line with said telescoping shaft and extending above said frame.

2. In a cloth cutting machine of the type having a reciprocating knife, the combination with the frame thereof, of rotary knife grinding means, means for rotating the latter comprising a telescoping shaft substantially parallel with the path of reciprocation of the knife, a drive-wheel for said telescoping shaft, a complemental drive-wheel for the latter, manual means for interengaging said drive-wheels, said last-named means includinga manually manipulative part in line with said telescoping shaft and extending above said frame, and resilient means separating said drive-wheels save only during such times as said manual means are being employed to interengage said drive-wheels.

3. In a cloth cutting machine of the type having a reciprocating knife, the combination with the frame thereof including a standard,

of an electric motor supported thereby, the

ing connection with said telescoping shaft, re-

silient means normally operatively separating said complemental driving wheel from said firstnamed driving wheel, a manual operating part extending above said frame and forming a hand -piece for steadying said frame, said manual operating part having operative relation to said complemental driving wheel whereby to a2;- ially move said complemental driving wheel against the resistance of said resilient means into operative engagement with said first name-d driving wheel, said telescoping shaft arranged to resist movement of said manual operating part, and holding means for holding said telescoping shaft in such resisting relation.

4. In a cloth cutting machine of the type having a reciprocating knife, the combina tion with the frame thereof including a standard, of an electric motor supported thereby, said reciprocating knife reciproeating up and down and guided in said standard and driven by said motor, a telescoping shaft comprising telescoping members, a grinder-head at the lower end of one of said members, rotary grinding means thereon for the knife, a driving wheel driven by said electric motor, a complemental driving wheel having driving connection with the other of said members, resilient means normally separating said complemental driving wheel from said first-named driving wheel, a manual operating part extending above said frame and forming a hand-piece for steadying said frame, said manual operating part having operative relation to said complemental driving wheel whereby to axially move said complemental driving wheel against resistance of said resilient means into operative engagement with said first-named driving wheel, and means for holding said grinder head in tip-position.

5. In a cloth cutting machine of the type having a reciprocating knife, the combination with the frame thereof including a standard, of an electrical motor supported thereby, said reciprocating knife reciprocating up and down and guided in said standard and driven by said motor, a telescoping shaft comprising telescoping members, a grinder head at the lower end of one of said members, rotary grinding means thereon for the knife, a driving wheel driven by said electric motor, a complemental driving wheel having driving connection with the other of said members, resilient means normally moving said complemental driving wheel in a given direction for afiecting driving relation between said complemental driving wheel and said first-named driving wheel, a manual operating part extending above said frame and forming a hand-piece for steadying said frame, said manual operating part having operative relation to said complemental driving wheel whereby to axially move said complemental driving wheel against resistance of said resilient means for oppositely affecting said driving relation, means for holding said grinder-head in up position, and means for selectively maintaining said holding means in holding relation and in release relation.

6. In a reciprocating knife cloth cutting machine, the combination of a standard, an electric motor supported thereby, a vertically reciprocable knife driven from said motor, a telescoping shaft comprising telescoping members, a grinder-head at the lower end of one of said members, rotary grinding means thereon for the knife, a wheel driven by said electric motor, a complemental wheel havin driving connection with the other of sai members, a housing for said telescopin shaft, a bearing thereon above said hea for the lower portion of said telescoping shaft, a cap for said housing, and a sleeve axially movable thereon and forming a bearing for the upper end of said other of said members, said sleeve arranged for axilally moving said complemental Wheel into operative relation with said first-named wheel.

7. Ina reciprocating knife cloth cutting machine, the combination of a standard, an

electric motor supported thereby, a vertically reciprocable knife driven from said motor, a telescoping shaft comprising telescoping members, a grinder-head at the lower end of one of said members, rotary grinding means thereon for the knife, a Wheel driven by said electric motor, a complemental wheel having driving connection with the other of said members, a housing for said telescoping shaft, a bearing thereon above said head for the lower portion of said telescoping shaft, a cap for said housing, a sleeve axially movable thereon and forming a bearing for the upper end of said other of said members, said sleeve arranged for axially moving said compleibo mental wheel into operative relation with 1,

said first-named wheel, and resilient means normally separating said wheels, and said one of said members normally arranged for maintaining said wheels in separated relation.

8. In a reciprocating knife cloth cutting machine, the combination of a standard, an electric motor at the upper end of said standard, a vertically reciprocable knife, a crankwheel driven by said electric motor for recip- 7 rocating the knife, said crank-wheel provided with an annular friction face, a coacting friction-wheel, a telescoping shaft with which said coacting friction-wheel has rotative' connection, rotary knife-grinding means reciprocable knife, of a telescoping shaft comprising a plurality of members substantially parallel with the path of reciprocation of the knife, rotating means for one of said members, a grinder-head at the lower end of the other of said members, rotary grinding means on said grinder-head, gearing on said grinder head between the lower end of said other of said members and said rotary grinding means, a toothed presser-foot stem coaxial with and telescoping in said telescoping shaft, a toothed holder on said head for said stem, an operating part therefor on said head, a relatively stationary operating part for the latter, and releasable connecting means between said operating parts.

10. In a reciprocating knife cloth cutting machine, the combination of a grinder-head arranged for movement substantially parallel with the path of reciprocation of the knife, rotary grinding means thereon, an operating shaft for the latter, a stud-block comprising a stud, means for releasably securing said stud-block to said head, a pinion at the lower end of said shaft, a pinion on said stud meshing with said. first-named pinion and having driving connection with said rotary grinding means, a presser-foot stem slidable axially in said stud-block, said operating shaft and said first-named pinion, and locking means on said head for said stem.

11. In a reci arocating knife cloth cutting machine, the combination of a grinder-head arranged for movement substantially parallel with the path of reciprocation of the knife, rotary grinding means thereon, an operating shaft for the latter, a stud-block comprising a stud, means for releasably securing said stud-block to said head, a pinion at the lower end of said shaft, a pinion on said stud meshing with said first-named pinion and having driving connection with said rotary grinding means, a toothed presser-foot stem slidable axially in said stud-block, said operating shaft and said iirst-named pinion, a toothed plug in said stud-block, and operating means on said head for said toothed plug.

12. In a cloth cutting machine, of the type having a reciprocating knife, the combination with the frame thereof including a knife standard arranged for guiding the reciprocating knife, of a grinder-head, means whereby to guide said grinder-head lengthwise of said standard, rotary driving means on said head, axially shiftable rotary grinding means on said head, relatively axially stationary rotating means on said head therefor, said rotating means having operative connection with said rotary driving means, said rotating means and said rotary grinding means having axially shiftahle driving means therebetween, and means mounted on and movable with said head for axially shifting said rotary grinding means with relation to said rotating means and to the knife.

13. In a cloth cutting machine of the type having a reciprocating knife, the combination with the frame thereof including a knife standard arranged for guiding the reciproeating knife, of a grinder-head, means for guiding said grinder-head lengthwise of said standard, rotary driving means, a driven wheel on said grinder-head driven by said rotary driving means, a grinding wheel on said grinder-head rotatable with and coaxial with said-driven wheel and movable on said grinder-head in axial direction with relation to said driven wheel toward and from said knife for grinding said knife, and means mounted on and movable with said grinderhead for controlling said axial movements of said grinding wheel.

14. Ina cloth cutting machine of the type having a reciprocating knife, the combination with the frame thereof including a standard with which said knife has guiding connection, of a grinder-head, means for guiding said grinder-head lengthwise of said standard, rotary driving means, a drive wheel rotated thereby and rotatable on and movable with said head, a pair of wheels on said head driven by said drive-wheel, a pair of grinding wheels on said head coaxial with said driven wheels and having axially shiftable drive connection therewith, and controlling means mounted on and movable with said head and having operative connections with said grinding wheels for axial movements of said grinding wheels lengthwise of the axes of said driven wheels toward and from said reciprocating knife for grinding said knife.

15. In a reciprocating knife cloth cutting machine, the combination with a reciprocating knife, of a grinder-head, means for guiding said head lengthwise of the path of reciprocating movement of said knife, a drivewheel having an axis of rotation substantially in the plane of said knife, a pair of driven wheels coacting with said drive-wheel, said driven wheels provided with tubular shafts, means for axially adjusting said driven wheels, a pair of grinding wheels, shafts therefor in said hollow shafts having rotative connections with said hollow shafts permitting axial movements of said grinding wheels toward and from said knife, and means controlling said axial movements.

16. In a reciprocating knife cloth cutting machine, the combination of a knife standard arranged for guiding the reciprocating knife, a grinder-head, means for guiding said head lengthwise of said standard, grinding wheels on said head at the respective sides of said knife, and a shield extending from said head over said grinding wheels and provided with a slot in which said standard is received, the walls of said slot being guided by said standard during movements of said head lengthwise of said standard.

17. In a cloth cutting machine of the type having a reciprocating knife, the co'mbina tion with the frame thereof includii'ig a standard, and means for guiding the reciprocating knife up and down in said standard, of a grinder-head, guiding means for guid ing said head lengthwise of said standard and the path of reciprocation of the knife, brackets at the respective sides of said head, a drive-wheel between said brackets, driven Wheels provided with tubular shafts, sleeves in which said tubular shafts are journaled, means for axially adjusting said sleeves on said brackets for adjusting said driven wheels in continuous meshing relation with said drive-wheel, grinding wheels provided with stems in said tubular shafts rotatable with and axially movable in said tubular shafts, and control means acting on said stems for axially moving said grinding Wheels with relation to the knife.

18. In a cloth cutting machine of the type having a reciprocating knife, the combination with the frame thereof including a standard, and means for guiding the reciprocating knife up and down in said standard, of a grinder-head, guiding means for guiding said head lengthwise of said standard and the path of reciprocation of the knife, brackets at the respective sides of said head, an adjustable bearing on each of said brackets, a driven wheel having a tubular shaft in each of said bearings, a drive-wheel between said driven wheels, a pair of grinderwheels provided with stems, one of said stems in each of said tubular shafts, means whereby said stems are axially movable in and rotate with said tubular shafts, and a laterally movable bow-part on said head, said bow-part provided with contact-parts for the outer ends of said respective stems for moving said grinder-wheels with relation to the knife for grinding the knife.

19. In a cloth cutting machine of the type having a. reciprocating knife, the combinationwith the frame thereof including a standard, and means for guiding the reciprocating knife up and down in said standard, of a grinder-head provided with a cavity, means for guiding said grinder-head on said frame lengthwise of said standard, a gear having an upright axis of rotation, a gear provided with a hub and having a horizontal axis of rotation meshing with said firstnamed gear, said gears located in said cavity, a closing-plate for said cavity secured to said head and provided with a hole in which said hub is received, said last-named gear located at one side of said closing-plate, a gear on said hub at the other side of said closingplate, a pair of gears having continuous meshing relation with said last-named gear, and grinding wheels movable in axial directions with relation to the position of the knife.

20. In a cloth cutting machine of the type having a reciprocating knife, the combination with the frame thereof including a standard, and means for guiding the reoipro cating knife up and down in said standard, of a grinder-head, guiding means for guiding said head lengthwise of said standard and the path of reciprocation of said knife, grinding wheels at the respective sides of said knife presented in relatively angular positions to said knife, relatively stationarily positioned driven wheels for rotating said grinding wheels, said grinding wheels provided with stems rotatable with and movable axially in said driven wheels, and a laterally movable bow-part on said head provided with end contact-parts for said stems for axially moving said grinding wheels into grinding contact with the knife.

In testimony whereof, I have hereunto signed my name.

ALBERT G. VAGNER.

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