US1568705A - Cloth-cutting machine - Google Patents

Description

Jan. 5 1926.

M; ZAWISTOWSKI CLOTHICUITTING ucrmua Filed Jan. 9, 1922 f 2 sheets-sheet 1 Ill."

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M. ziAwls'rowsKl CLOTH CUTTING MACHINE Filed Jan. 9, 1922 2 Sheets-Sheet 2 Whoa "F art koala,

Patented Jan. 5, 1926 MARTIN ZAWISTOWSKI, or BROOKLYN, NEW YORK.

CLOTH-CUTTING MACHINE.

Application filed January 9, 1922. Serial. N01 527,833.

To'all whom it may concern: V Be it knownthatI, MARTIN ZAWISTOWSKI, a citizen'oftheUnited States, and resident of Brooklyn, in thecounty of Kings. and State of New York, have invented'certain new and useful Improvements in 'Cloth- Cutting Machines, of which the following is a specification.

This invention is an improvement incloth cutting machines of the general type shown in my prior Patent 1,378,162, issued May 17th, 1921, and in whicha base slidable beneath the layers of material to be cut carries a vertical knife and an electric motor for reciprocating it.

In the machine shown in said patent there is provided a knife guard disposed in front of the knife and carrying at its lower .end a presser foot vertically adjustable to a position corresponding to the thickness of the superposed layers to; be cut. The knife is shown as connected to the motor by means of a cross-head, a connecting rod, and a crank disk.

My present invention relatesfparticularly to the construction of these parts, and among the mainobjects are to facilitate the adjustment of the presser foot 'and cross head guide, and insure proper lubrication of the parts. The invention involves various important features, and is embodied in a preferred form in theconstruction shown in the accompanying drawings. It is evident that other forms may? be designed within the scope of my invention as defined in the appended claims. l

In'these drawings r Fig 1 is a side elevation of a portion of the machine, many of the parts being shown in section,

Figs. 2 and 3 aresections on the lines 2+2 and 3-3 respectively of Fig. 1,

'Fig. l is a face view of certain of the parts, including the knife guard clamp, and

Figs. 5 and 6 are face and end views respectively of the adjustable cross-head guide. 7 V i V The working parts of the machine illustrated are carried 'by a vertically disposed standard 10, the lower end of which is secured to and supported by a base not shown, but of any suitable construction, as for instance that illustrated in myprior Patent 1,378,163, issued May 17th, 1921. The standard 10 carries a frame 11 at its upper end, a rotary electric motor 12 secured to or mounted inthe frame, and a handle 13 for guiding and controlling the machine. The motor has a shaft 1 carrying a combined fly-wheel and crankdisk 15, and this crank disk is connected to a cross-head 16 by means ofa' connecting rod 17. The cross-head is vertically guided and is connected to the knife 18 which is vertically movable in a slot or groove 19in the front edge of the standard '10. In front of the knife is. a vertically adjustable knife guard 20 having at its lower end a presser foot 21. The general arrangement and function of the various parts above describedis approximately the same as that shown in my prior Patent 1,376,162. I v

'As one important feature of my present invention means are provided whereby the presser foot and knife guard are normally rigidly supported but may be easily. and

quickly released to permit the presser foot to automatically rise when the knife reaches a portion ofthe cloth or other material'of increased thickness, as for instance when there is a larger number of layers of cloth at one point than at another 'As shown the frame or casing includes a cover member 22 providediwith a groove in the front surface thereof Within which the knife guard or presser foot carrier 20 is vertically slidable.

Engaging with opposite sides of the guard 20 areapair of wedge member's 23vacting as clamps and vertically movable to grip or release the guard. Each wedge member has a straight side-for engagement with the side of the guard, and'a'n inclined or converging side movable along a coacting surface of the supporting-framepart 22. The wedges taper in opposite'directions, so that upon moving one wedge upwardly and the other one downwardly, they may be simultaneously forced into gripping engagement with opposite sides ofthe guard. Likewise,'up0n moving each in the opposite direction, the guard may be released and permitted to drop by gravity until the presser foot engages with the upper layer of cloth, or to rise as the; presser foot rides up on toa portion of increased thickness. The means illustrated for operating the wedges includes a plate 24 mounted to oscillate on a pivot pin 25, and having cam slots 26 receiving pins 27 carried by the wedges. The pivot 25 has a threaded portion extending into a plate 28 held rigidly to the frame in any suitable manner, as for instance by 4 ing position.

screws, as shown in dotted lines in Fig. 4. This plate serves as a front wall for holding the wedges in place, and also has slots for guiding the pins 27 during the endwise movement of the wedges. Due to the inclination of the slots 26 it will be noted that oscillating the plate 24 in a clockwise direction will tend to lift the left hand wedge and lower the right hand wedge 23, and thus release the guard. Oscillation in a counter-clockwise direction moves the wedges into the opposite or locking position.

For oscillating the plate the latter is provided with a depending arm 29 connected by a link 30 to a lever 31. This lever is pivoted intermediate of its ends, as for instance on a pivot pin 32, and has its free end terminating adjacent to the handle .13, so that it may be readily operated to release or grip the guard. A spring 33 preferably ac on the lever to swing it in such a direction as will 1110\(3 the wedges to lock- Thus the presser foot is normally locked, and is released only when the lever 31 is moved against the action of the spring. The instant the lever is released the spring returns the parts to locking position. It will thus be seen that the presser foot is normally held at the predetermined and desired elevation, but may be released at any time while the machine is in operation, and by a slight movement of the thumb of the hand which gm des the machine. The presser foot when released may rise or drop as occasion may require, and will be locked in the new position the instant the operator release the handle-31.

The cover plate 22 of the main frame and which carries the knife guard is shown as being secured in place by a pair of screws 35 of such character that they may be very readily removed to take off the cover plate, and all of the parts carried thereby. Directly in the rear of the cover plate and ably mounted independently of the cover is the cross-head guide 36. In the rear of this is the non-adjustable crosshead guide 37. The guide 37 is in the form of a tube rigidly supported at its opposite ends, and extending through aguide openingor passage in the cross head 16. The front edge of the cross-head is beveled and enters a groove in the rear surface of the guide 36, shown particularly in Fig. 2. The guide 37 being circular in crosssection permits the front edge of the cross-head to lateral to a very slight extent, and

- to accurately center in the groove ront guide 36. Thus no lateral adof the cross-head is necessar nenr front cross-head guide 18 ad ustable toward and from the cross head to give the For holding it in proper sliding contact.

the guide place and giving this adjus 36 is provided with a pair of apertures 3839 at each of the four corners thereof. The four apertures 38 are threaded to re ceive adjusting screws 40 which may abut against shoulders or stops 41 in the main frame or casing. The four apertures 39 are not threaded, but receive adjusting screws 42 having threaded engagement in the stops 41. Thus the screws 40 may be rotated until their free ends project beyond the inner surface of the guide member 36 to the desired extent, to space the guide, and the screws 42 may be tightened to hold the guide in place. In other words, the

guide may be adjusted inwardly by loosening the screws 40 and tightening the screws 42, while it may be adjusted outwardly by loosening the screws 42 and tightening the screws The cross-head is secured to the knife 18 in any suitable manner, as for instance by means of a clamping bolt 44, and is secured to the connecting rod 17 by means of a tubular pin 45 inserted from the rear edge of the cross-head and seating at its inner end, and normally held from removal by the guide 37.

For lubricating these and the other parts of the driving connection between the motor and the knife, the crank disk 15 is provided with a groove 46 in the face thereof toward the end wall 47 of the motor casing. This end wall has an oil passage 48 extending downwardly toward the motor shaft 14, and terminating in oppositely facing ports. One of these, 49, leads to the ball bearing 50 which supports the shaft 14 and the other is provided with a short delivery tube 51 extending into the groove 46. The inner edge of the groove 46 is concentric with the shaft 14, but the outer edge is slightly eccentric, as indicated in dotted lines in Fig. 3. The edges of the groove are undercut, as shown particularly in Fig. 1, so that oil delivered through the tube 51 into the groove is retained in the groove and tends to move to the point on the outer edge at the greatest distance from the axis of rotation. At this point there is a passage 52 leading into the ball bearing 53 which supports the crank pin 54 of the connecting rod 17. This crank pin may be rigidly clamped to the connecting rod and to the inner race ring of the bearing 53. Thus oil introduced through the passage 48 serves to lubricate both of the bearings, even though one of these is eccentrically located and bodily carried by the crank disk 15.

The peripheral wall of the casing is ;provided with a groove located in substantially the same plane as the rear surface of the crank disk 15, so that oil which may overflow from the groove 46 and which is thrown out radially by the crank disk Will be received in the groove and conducted to a port which leads to the upper end the oil is slowly delivered to the external surface of the guide on which the crosshead slides. Seine of the oil delivered from the openings 57 flows to the interior of the hollow connecting pin 45 in the cross head, and this has radial openings 58 whereby the bearing surface ofth connecting rod on said pin is lubricated. Furthermore, the opening which receives the pin 45 terminates in an oil passage 59 leading to the knife edge of the cross-head which has sliding engagement with the guide 36. From the foregoing it will be seen that oil delivered through the single passage 48 serves to lubricate all of the bearing surfaces of the cross-head, connecting rod and crank disk support, and it is therefore necessary to apply oil at only a singlepcint to insure proper and adequate lubrication.

By means of my improved construction the machine may be kept in good working condition with the minimum instructions and attention by the operator who is ordinarily not skilled in the proper care of machinery.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. A cloth cutting machine having a vertically movable presser foot carrier, a guide for preventing lateral movement thereof, and a pair of vertically movable Wedges in engagement with opposite sides of said carrier and movable in opposite directions for clamping the latter, and means for operating said wedges simultaneously 2. A cloth cutting machine having a vertically movable presser foot carrier, a guide for preventing lateral movement thereof, a pair of vertically movable wedges in engagement with opposite sides of saidcarrier and movable in opposite directions for clamping the latter, means for operating said wedges simultaneously, and means ex tending to the opposite end of the machine for operating said wedges.

A cloth cutting machine having a vertically movable presser foot carrier, a guide for preventing lateral movement thereof, and a pair of vertically movable wedges in engagement with opposite sides of said carrier and movable in opposite directions for clamping, the latter, and an oscillatory member for operating said wedges simultaneously.

4. A cloth cutting machine having a vertically movable presser foot carrier, a guide for preventing lateral movement thereof and a pair of vertically movable wedges in engagement with opposite sides of said carrier and movable in opposite directions forclamping the latter, an oscillatory member for operating said wedges simultaneousl'y, and a pivoted lever for oscillating said member. I v

5. A cloth-cutting machine havlnga vertically movable presser foot carrier, a verticallymovable wedge adjacenttl'iereto for locking or releasing thecarrier, an oscillatory member for-operating sa1d Wedge,-and a'pivoted lever for operating said oscillatory member.

6. A cloth cutting machine having a guiding handle, a vertically movable presser foot carrier, a vertically movable wedge adjacent thereto for locking or releasing'the carrier, an oscillatory .member for. operating said wedge, and a member extending to a point adjacent to said handle for operating said oscillatory member.

7. A cloth cutting machine of the reciproeating knife type, including a crank disk having a crank pin rotatably mounted therein and a groove in the face thereof opposite to said crank pin, a passage leading through said crank disk from said groove to the bearing of said pin and means projecting into said groove for delivering oil thereto.

'8. A cloth cutting machine of the reciprocating knife type including a drive shaft, a crank disk secured thereto and having an annular groove in the face thereof, a crank pin rotatably mounted in said disk, av connecting rod secured to said pin, a crosshead secured to said connecting rod, 2. guide for said orosshead and a casing enclosing said crank disk and having a passage for the delivery of oil to said annular groove, and having an annular groove encircling said crank disk to receive oil therefrom and. deliver the same to said guide.

9. A cloth cutting machine having a reciprocating knife, a cross head secured thereto, a connecting rod for operating said cross head, a pair of guiding members for said cross head, and a pin mounted in said cross head and upon which said connecting rod is journalled, said pin having its axis intersecting both of said guiding members, one of said guiding members having a passage for the delivery of oil therethrough, and said pin constituting means for de livering oil fromsaid last mentioned member to the other member of said pair.

10.'A cloth cutting machine having a reciprocating knife, an electric motor, and connections between said motor and said knife, including a crank disk, a connecting rod and a cross head, said crank disk having an annular groove in the face thereof opposite to its crank pin bearing, and communicating with the latter, and. a stationary oil delivery tube communicating with said groove.

11. 'A cloth cutting machine of the reciprocating knife type, including an electric l GU motor casing having a motor shaft journaled therein, a crank disk secured to said shaft, said disk having a connecting rod pivotaily secured thereto on one side and an annular groove in the opposite face thereof, the outer Wall of said groove being eccentric in respect to the disk and communicating with said connecting rod at the point in the groove of maximum distance from the axis of the disk, and said casing I having an oil passage for delivering oil to said groove and to the bearing of said m0- tor shaft.

Signed at New York in the county of New York and State of New York this 15 6th day of January A. D. 1922.

MARTIN ZAWIsT-OWSKI.

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