US1263450A - Sharpening attachment for cloth-cutting machines. - Google Patents

Description

H. MAIMIN.

SHARPENTNG ATTACHMENT FOR CLOTH CUTTING MACHINES.

v APPLICATTON FILED JUNE 15. 1914.

Patented Apr. 1918.

Z SHEETS-SHEET I 59 V ATTORNEYS H. MAIMIN.

SHARPENING ATTACHMENT FOR CLOTH CUTTING MACHINES.

APPLICATION FILED JUNE 16. 1914.

Patented Apr. 23, 1918;

2 SHEETS-SHEET 2.

nvmaiv maintain, or new irons, iv. v.

SHARPENING ATTACHMENT FOR CLD TH CUTTING MACHINES.

To all whom it may concern Be it known that I, HYMAN MAIMIN, a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Sharpening Attachments for Cloth-Cutting Machines; and I do hereby declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Cloth cutting machines having rotary cutting knives are commonly equipped with knife-sharpening grinders adapted to be brought .into grinding engagement with the cutting edge of the knife at the will of the operator, in order that the knife may be continuously kept at a high point of cuttting eiliciency. These grinders commonly consist of a pair of rotatable grindstones positioned on opposite sides o-f the edge of the cutting blade and so mounted that they lie normally out of engagement with the edge of the blade, but may readily be brought into contact therewith when necessary or desirable. The capacity of the grindstones to produce a proper cutting edge on the knife depends upon the proper setting of the stones with relation to the knife edge. That is to say, there is a certain best position in which the sweep of the knife edge along and across the preferably conical surfaces of the stones produces the most effective cloth-cutting edge; and the purpose of the present invention is to provide an arrange ment such that this correct position, having been initially established, will always be maintained as the knife edge of the stone surfaces wear away, it being understood that the stones are, as usual, normally out of engagement with the knife but capable of being brought into contact therewith when necessary or desirable.

To this end, the sharpening grinder, preferably consisting as usual of two grindstones on opposite sides of the knife-edge and having coned surfaces for engagement therewith, are arranged to move from a disengaged position to a sharpening engagement with the cutting edge by a movement of translation along a straight line in a direction substantially radial of the knife disk, so that, as the diameter of the knife is reduced by wear, the proper relative position of the grindstones with respect to the Specification of Letters Patent.

3 Application filed June 16, 1914.

Patented Apr. 23, 1913..

serial no. 845,355.

knife edge will be maintained. Furthermore, the direction of movement of the in- CliViClHzLl stones is preferably along lines which converge toward the plane of the knife, so that as the stones wear down, coincidentally with the wearing down ofthe knife, they will automaticall move inwardly toward the knife edge. rovision is also made, in the preferred form of the invention, for an additional adjustment of the grindstones toward ,and away from each other laterally of the knife to perfect the ii'ntial adjustment for any particular blade.

In the accompanying drawings, illustrating the preferred embodiment within my invention,

Figure 1 is a side elevation of the cutting machine 2 is a section on line 2-2 of Fig. 1;

Fig. 3 is a vertical central section on an enlarged scale;

Fig. 4 is a section on line l-4 of Fig. 3; and

Fig. 5 is a section on line 5-5 of Fig 1.

In the drawings, the motor 1 and the recessed standard 2 upstanding from the base 3, the directing handle 4, the electrical switch 5 and the guard 6 in front of the knife, are, in general, similar to the disclosure in the United States patent to Morton Arendt No. 1,125,434 of January 19, 1915. The vertically disposed driving motor shaft 7 carries the bevel pinion 8 meshing with the bevel gear 9 rotatably mounted on ball bearings on the hub 13 to which the knife disk 14 is clamped by the cap 16.

The two grindstones 20 are mounted for rotation on studs which comprise sliding portions 21 having feathers 22 engaging grooves in the guides 23, and also having journal portions 24: bent upwardly at different angles to bring the stones into sharpening engagement with the two sides of the knife at circumferentially separate places. The axes of the sliding portions are directed from the circumference toward the axis 13 of the cutting knife substantially radially thereof, and inwardly toward the plane of the knife in converging lines. In this way, effective sharpening engagement occurs between the grindstones and the knife irrespective of the worn diameter of the knife. The guides 23 are mounted on a rod 25 supported in the standard 2 and are adjustable toward each other by means of the adjusting screws 26 threaded into the ends of the rod 25, and away from each other by means of the springs 27 coiled around the rod between the guides and a top extension of the standard 2. Lock screws 19 are provided to secure the guides in their adjusted positions.- Thus the grindstones may be moved laterally of the knife to produce the most effective initial sharpening engagement with any particular knife blade.

The mechanism for moving the grinders from their normal position away from the knife to the position of sharpening engagement therewith, comprises, in addition to the guiding devices previously described, the lever mechanism consisting of the handle lever 29 located in proximity to the directing handle a of the machine for convenient manipulation by the finger while still grasping the directing handle, and also a bent lever 30 pivotally connected at 31 to the handle lever 29 and at 32 tothe wedge shaped cam 33 (see Figs. 4: and 5). This cam rests between the stationary cam member 34 and, the roller 35 mounted in bearings in the sliding portions 21 of the studs. Upon pulling the handle 29 toward the directing handle, the cam 33 presses against the roller 35 and thus moves the grinders 20 in their guided direction to sharpening engagement with the cutting edge of the knife. Upon releasing the handle 29, the lever mechanism is returned by the spring 36, while the studs on which the grindstones are mounted for rotation are returned to their normal position ofdisengagement by means of the springs 37. 7

Having thusdescribed my invention, what I claim is:

1. In a cloth cutting machine, .a rotatable cutting knife, a sharpening grinder normally disengaged from the knife, and lever mechanism designed to impart to the 'rinder a movement of translation inv a straight line and in a substantially radial direction to ward the axis of the knife intosharpening engagement with the cutting edge.

- 2. In a cloth cutting machine, a rotatable cutting knife, a sharpening grinder normally disengaged from the knife, and lever mechanism designed to impart to the grinder a movement of translation in a straight line and in a substantially radial direction to ward the aXis of the knife and inwardly toward the plane thereof into sharpening engagement with the cutting edge.

3. In a cloth cutting machine, a rotatable cutting knife, a pair of sharpening grindstones arranged on the two sides of the knife normally out of engagement therewith, and mechanism designed to impart to the grindstones movements of translation on converging straight lines substantially ra- Gopies of this patent may be obtained for dially of the knife into sharpening engagement with both sides of the cutting edge.

4. In a cloth cutting machine, a rotatable cutting knife, a sharpening grinder normally disengaged from the knife, a guide for the grinder radially arranged with respect to the knife, and lever mechanism for moving the grinder into sharpening engagement with the cutting edge of the knife.

5. In a cloth cutting machine, a rotatable cutting knife, a pair of sharpening grindstones normally disengaged from the knife, guides for the stones radially arranged with respect to the knife, mechanism for simultaneously moving the stones in the guides into sharpening engagement with the cutting edge of the knife, and mechanism for adjusting the guides laterally of the knife.

6. In a cloth cutting machine, a rotatable cutting knife, a pair of sharpening grindstones normally disengaged from the knife,

guides for the stones radially arranged with respect to the knife and set on converging lines, mechanism for simultaneously moving the stones in the guides into sharpening engagement with the cutting edge of the knife, and mechanism for ad usting the guides laterally of the knife.

7. In a cloth cutting machine, a rotatable cutting knife, a pair of sharpening grindstones arranged on the two sides of the knife normally out of engagement therewith and mounted for movements of translation on converging straight lines substantially radially of the knife into sharpening engagement with both sides of the cutting edge, and means common to the two grindstones for simultaneously moving both of the same into sharpening engagement with the knife.

8. In a cloth cutting machine, a rotatable cutting knife, a sharpening grinder normally disengaged from the knife, :1 guide in which said grinder is mounted for radial movements with respect to the knife toward and away therefrom, lever mechanism for so moving the grinder in the guide, and mechanism for adjusting the guide laterally of the knife.

9. In a cloth cutting machine, a rotatable cutting knife, a sharpening grind-stone normally disengaged from the knife, a guide for the stone radially arranged with respect; to the knife and inclined toward the plane of the knife, means for moving the grindstone in said guide, and means for adjusting the guide laterally of the knife.

In testimony whereof I aiiix my signa ture in presence of two witnesses.

IIYMAN MAIMIN.

Witnesses:

L. BATES M. A. BILL,

five cents each, by addressing the Commissioner of Patents, Washington, D. G,"

Images