US2236038A - Honing or sharpening device for cloth cutting machines - Google Patents

Description

\ w v J. SILBERSTAN HONING OIR SHAHPENING DEVICE FOR GLUT-H CUTTING MACHINES Filed Aug. 5, 193@ Patented Mar. 25, 1941 PATENT OFFICE HNING R SHARPENING DEVICEFOR TCLTH CUTTING MACHINES Jacob Silberstang, New York, N. Y.

Application August 5,

Claims.

rlhe present invention relates to an improvement in cloth cutting machines and has for its principal object the provision of means thereon,

substantially permanently mounted thereto, of

5 a'knife sharpening means, whereby, as required,

from time to time, the knife edge maybe sharpened or honed.

One of the main features of the present im-` proved svtructure is that` the sharpening of the blade is accomplished by a sharpening means which is moved to the blade" and simultaneously contacts on both sides and bottom edge thereof,- the sharpening being accomplished by the normal reciprocation of the blade against the xedly held sharpening means. Thus the blade may be quickly and automatically brought to a keen cutting edge, without stopping the machine and without any grinding movement of the normally stationary sharpening means, other thanl to ra- 20` dially move it into land out of knife edge engagement.

Afurther feature of advantage in the present improvement is that the present sharpening means acts as a blade guard, protecting the operator from `accidentally touching the blade edge, the blade cutting edge being also protected thereby from inadvertent damage.

A further feature of advantage is` that the present sharpening means also mounts the presser foot, the presser foot and its attached blade grinding or sharpening means are vertically movable to accommodate the varying thickness of the pile of cloth being cut.

A further feature of advantage lies in the provision olf means for locking and releasing the sharpening means and its presser foot in any adjusted upward position when first entering the knife towards the cloth to be cut.

A further improvement relates to the manner 40 in which the sharpening elements are automatically and normally held out of blade sharpening position and the manner of arrangement of the said elements upon the guard frame.

An outstanding function of the instant structure is its simplicity, ease of operation, its applicability to any existing cutting machine, new or old. The present improvement does not, of itself, require the use of separate driving means or prime mover.

A further feature of advantage is in the provision of two separated, pivotally and vertically mounted shafts upon which are mounted a plurallty of outstanding Ybracket arms on the outer ends of each of which are removably mounted abrasive blocks or hones, which' blocks during 1938,'Serial No. 223,1{77

the sharpening operation, simultaneously contact on both faces of the blade edge, in balanced pressure. The blocks or hones, being removably mounted may be reversed in their bracket or arm ends, as one side of the sharpening face wears away, and thus be quickly renewed.`

A further feature of advantage lies in the use cf plural hones, these being vertically spaced apart from each other on the same shaft support and being spaced apart, alternately, from each other on their respective pivotal shafts. The vertical spacing or pitch of the hone pieces between each other and on each shaft is less than the stroke of the blade, so that normal reciprocation of the blade causes all 'of the blade edge to be honed or ground.

A further feature of advantage is in the provision of means between the hone holding arms and their respective shaft mountings whereby the faces of the hones may all be adjustably alined to contact on both sides of the ground face of the cutting blade, evenly and simultaneously. As constructed and operated, the hones are flat faced and due to the manner of mounting them on the arms, which are slightly flexible, the hones contact with the ground faces of the bladeat a narrow angle, as will be hereinafter pointed out in detail.

Means are also provided whereby the hones are normally and resiliently held out of operative honing position when not in use, being held forwardly of the cutting blade and being manually adjustable for moving the hones to honing position on opposite sides of the blade cutting edge. p

The foregoing and other features of advantage w'illl be apprehended as the herein description proceeds, and it will be obvious that modifications may be made in the structure herein, without departing from the spirit hereof or the scope of the appended claims.

In the drawing- Fig. 1 is a view in elevation of the cutting machine and honing means;

Fig. 2 is a fragmentary front view, in elevation, of the upper part of the honing means;

Fig. 3 is a fragmentary view of the side opposite to that shown in Fig. 1, showing the hone carrier latching and release means;

Fig. l is a fragmentary side view of the hone, hone arm and `carrier shaft;

lig. 5 is an end view of the hone and gripping means as `viewed from; the right hand side of Fig.s4;

Fig. 6 is a sectional view, taken on the line 8 6, Fig. 1, looking in the direction of the arrows;

Fig. 7 is a fragmentary view, in front elevation, of the manual means for controlling the hones;

Fig. 8 is a sectional view in plan, taken on line 8 8, Fig. l, looking in the direction of the arrows; and

Fig. 9 is a plan view of the presser foot removed from its operative position on the reciprocating hone holding guide.

In general, most of the cloth cutting machines comprise an electric motor M, which is connected to a vertical standard or knife guide S, by an intermediate connection or motor base N, Fig. 1. The standard S is grooved as at o, Figs. 1 and 8, to guide a vertically reciprocating, angled face knife 1c. The upper end of the knife k is connected to a motor driven rotary means, not shown, but is well known in this art. The motor and knife standard connecting means is provided with the usual horizontal handle H, broken for conveniency, Fig. l, whereby the cutter is manually directed against the cloth to be cut.

The knife standard or guide S is firmly mounted in a base plate B of the customary kind. All of the foregoing noted parts are substantially standard to cloth cutting machines, are well known and it is thought, need no further detailed description.

The front face plate 'I of the motor M, Figs. 1, 2 and 6 is provided with two opposed Z-shaped guide strips 4 and 5, these being held to said plate 'I in spaced operative position by screws 6--8, Figs. 2 and 3. The strips 4 and 5 are so located as to form a gibway in which is slidably mounted an H-shaped, elongate gib piece 3,

i0 which is of such a length as to permit its attached presser foot F to extend and rest upon the base B and to be fully supported by the gibway at its upper end while in the lower position of rest.

The presser foot F of well known construction, may be afxed to the lower end 32 of the gib 3 by any suitable means.

As shown in Figs. 2 and 3, one flange or rib 2l of the H-shaped gib 3 is provided with rack teeth T along its entire length and this toothed section with its opposite rib 20, slide in the slide grooves formed by the guide strips 4 and 5.

A manipulating knob N is affixed at the upper end of gib 3, to enable the user to raise and lower the gib 3, as desired.

At the front side of support N, Figs. 2 and 3, is located a bearing block 39, which is secured to the slide 5 by screws 48-40, said bearing 39 slidably supporting a toothed detent 38, the inner end of said plunger being provided with teeth, which mesh with the teeth T on said gib 3. The outer end of said plunger 38 is provided with a yoke Y and in this yoke is pivotally mounted, by a pin 4I, to one arm 36 of a hand lever, the opposite end of said lever having a twisted section 3l to form a flat manipulative handle, which extends downwardly at a slight angle, so as to be located adjacent the cutting machine handle H, for convenience in manipulating, Figs. 2-3.

The lever portion 38 is pivoted in a trunnion block 33 by a pin 34, said block being aflixed to the support N by screws 33''-33, Fig. 3. Thus the lever 38-31 is pivoted adjacent the toothed detent 38, so that said detent may be reciprocated in the bearing 39, to hold or release the gib rack 3 in any upper or lower position of vertical adjustment.

The hand lever 36-31 is spring actuated to normally keep the toothed detent 38 in meshed contact with the gib-rack 3, and to this end, a compressible coiled spring 35, Fig. 3, is connected between the arm 36 and the trunnion block 33. Squeezing the lever arm 31 towards the handle H releases the gib-rack and its appurtenant parts.

From the foregoing it will be seen that the gibrack 3 and its presser foot F may be moved up and down, as indicated by dotted lines F, Fig. l, carrying with it the knife sharpening means mounted thereon, as will now be described.

The front face of the gib-rack 3, as will be seen in Figs. 1 and 7 mounts an angle bracket bearing 8, to form an upper bearing for two vertically alined, rotatable shafts I-II, Fig. 7. The bearing ends of shafts I ll-II may be reduced in diameter as at I and I6. Below the bearing 8, the shafts are provided with two intermeshing gears I2 and I3. The reduced end I5 of shaft I0 is extended and mounts thereon a hand operated lever I8, the hub I'l of which is suitably affixed to the shaft extension I5. A coiled spring I4 is mounted over extension I5, and has one of its ends xedly caught on hub I'I. The other end of said spring being extended and caught on the short extending end of shaft end I6. This arrangement causes the lever I8 to be normally and resiliently held in the retracted position shown in Figs. 1 and 6.

The lower end of the gib-rack 3 also has a fixed angle bracket bearing 9, which rotatably supports the lower reduced or shouldered ends of shafts I0 and II, as can be seen in Fig. l. Thus the parallel shafts I0 and II are rotatable in opposite directions simultaneously by reason of the meshed gears I2 and I3 fixed thereon, when the handle I8 is manipulated to the dotted position shown at A, Fig. 6.

Each of the shafts are provided with a plurality of slightly resilient sheet metal arms 24, these arms being right and left handed in their mounting on each shaft.

The arms generally denoted by 2 and 2, are made, preferably, of nat sheet metal to obtain a certain amount of side resilience when the hone pieces 22 contact with the blade edge.

The arms are each provided at one end with a quill ended, shaft embracing curl 25, Figs. 4 and 8, and, as seen in Fig. 4, are downwardly offset at 24. The opposite end of each arm is formed a hone embracing jaw or clip 23', which is so bent as to provide two opposing, resilient hone gripping lips a-a. These lips are spaced apart, and are resiliently further spread apart upon the introduction of a rectangular hone piece 22 therebetween, such assembly being shown in Figs. 4 and 5.

The hone pieces are preferably made of a suitable abrasive stone of suitable grain, and are each provided with opposed, longitudinal side grooves 22' and 22', into which the lips a-a compressively engage, to thereby removably 'hold the hones in operative blade edge honing position. 'Ihe hones are shown as being rectangular, but they could be of any other operative outline or contour. By the hone and jaw construction above described, when the sharpening or honing surface of hone 22 becomes glazed or worn, the hone may be withdrawn and be reversely inserted with its opposite honing face exposed, or a new honing piece inserted in the jaw 23.

In order to provide means for adjustably and operatively mounting the honing arms 2 and 2' to the shafts I and Il, the quills 25 are provided with two parallel, elongate slots 2li- 26 near their ends and after snapping the quills onto the shafts lll or Il, two screws 21-21 are screwed into the shafts through the said elongate slots, and, after radially adjusting all of the arms on each shaft into blade contacting alinement, the screws 21 are firmly tightened on the quills. This construction permits of individual radial adjustment of each hone and hone arm, if desired. This latter feature of radial adjustment, as willv be seen dotted, Fig. 8, brings all of the honing faces in such position that they all contact, simultaneously on opposite sides of blade lc at and near the cutting edge E, to produce an even contact of all of the hones along the entire operative length of the cutting edge.

The hone holding arms on each shaft I0 or ll are mounted in a relatively staggered arrangement as will be seen in Fig. 1, where the hone arms Ell and hones 22 are held in non-operative position away from the knife by the spring I4, as previously described. In Fig. 1 the lowermost first arm 2', which is located on shaft I0 is spaced from its next upper, successive arm 2', and this spacing continues on the other arms 2', on shaft Il). As thus shown the honing faces of the hones 22 are faced towards the viewer.

The hone arms on shaft Il are each located between the spaces of the hone arms on shaft l0, and vice versa, an-d thus the hone arms on each shaft I!) and Il are alternated or staggered. As viewed in Figs. 6 and 8, when the hone arms are in non-operative position, the outer hone ends of 2 and 2 pass one another, at their extremities into the spaces between each row of hone arms. Thus the faces of the hones 22 on the shaft Il face away from the viewer, as shown in Fig. 1.

In Figs. 6 and 8, when the hone arms and hones are back in non-operative position the honing faces are exposed, but when the arm I8 is swung one hundred and eighty degrees, approximately, to the dotted position, in Fig. 6, the hone arms are moved to the dotted positions shown in Figs. l and 8, with the honing faces in contact with the blade 1c.

A further feature of advantage will be noted by a study of Fig. 8, in which the blade contacting hones embrace the angular blade k at its angular face planes, shown dotted, so that the blade wears back at its natural angle as it is repeatedly sharpened.

When the opposed honing devices are brought to the blade as shown dotted in Fig. 8, the blade is permitted to oscillate at its customary speed and the blade is thus rubbed up and down against the stationary hones, to which pressure may be applied by the handle I8.

Due to the construction and location of this sharpening device, with the presser foot F, resting on the base B, the operative reciprocation of the blade brings up the lower, under, angled cutting edge L, Fig. l, intol such position upwardly as to cause said cutting edge to be also automatically sharpened as it alternately contacts with the two lower, opposed hones.

It will thus be seen that the Sharpener as applied and operated is simple in construction and speedy in operation, and in nowise interferes with the operation of the cutter.

Having thus described the invention what is claimed is: l

1. In combination, a cloth cutter having a vertically reciprocating knife, a gib, guide means for slidably supporting the gib for vertical movement in front of said knife, two rotatable shafts mounted for rotary movement on said gib, each shaft having a row of outstanding radial arms mounted thereon, said arms having resilient hone holding jaws, each jaw mounting a hone; and means between said arms and said shafts for providing radial alining adjustment therebetween.

2. The combination with a cloth cutter having a vertically reciprocating knife, knife sharpening means including a slidable gib, guide means on the cutter for slidably supporting the gib for vertical operation in front of said knife, a presser foot carried by said gib, two rotatable shafts mounted for rotary movement on said gib, each shaft having a row of outstanding arms mounted thereon, said arms having resilient hone holding jaws, each jaw mounting a removable reversible, nonrotatable hone.

3. The combination with a cloth cutter having a vertically reciprocating knife, knife sharpening means, including a slidable gib, guide means for slidably supporting the gib for vertical operation in front of said knife, a presser foot carried by said gib, a pair of opposed, dual bearings spacedly mounted upon said gib, a pair of spaced parallel shafts vertically mounted in said bearings and adapted to be moved with said gib, a plurality of groups of hone carrying means adjustably carried on each said shafts in normally staggered relation to the arms on the other shaft, each of said hone carrying arms being provided with a nonrotatable, removable hone and means on and between said shafts for simultaneously and radially moving said hones to opposite faces of said blade,v

4. The combination with a cloth cutter having a vertically reciprocating knife, knife sharpening means, including a slidable gib, guide means for slidably supporting the gib for vertical operation in front of said knife, a presser foot carried by said gib, upper and lower bearings on said gib, a pair of vertical shafts mounted in said bearings; a group of resilient outstanding arms mounted in one row on each shaft, means between said arms and said shafts for providing radial alining adjustment therebetween, each arm having a resilient hone supporting jaw thereon at its outer end and hones located inl each said jaw, said hones on each row of arms being faced normally outward when in non-operative position, and means for rotating the shafts to carry the hones from the non-operative contact with said knife to operative honing contact therewith.

5. The combination with a cloth cutter having a vertically reciprocating knife, knife sharpening means, including a slidable gib, guide means for slidably supporting the gib for vertical operation in front of said knife, a presser foot carried by said gib, a dual spaced apart knife honing means; means for mounting said duel knife honing means on said gib normally out of operative contact with said knife and movable into contact with the knife, and, manual means for causing said honing means to contact on both sides of the cutting edge of said knife during reciprocation of the blade, said slidable gib being provided on one of its edges with a toothed rack section, and a control lever movably and pivotally mounted adjacent thereto, said lever having a pivoted, slidable, toothed latch manually engageable with said rack portion whereby to lock said gib and its fixed associate presser foot and honing means in any adjusted position and to release said gib and associate members from their latched adjusted position.

JACOB SILBERSTANG.

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