US1207780A

US1207780A - Knife-guard and stripper for cloth-cutting machines.

Info

Publication number: US1207780A
Application number: US5406715A
Authority: US
Inventors: David S Maimin
Original assignee: Individual
Current assignee: Individual
Priority date: 1915-10-04
Filing date: 1915-10-04
Publication date: 1916-12-12
Anticipated expiration: 1933-12-12

Description

D. S. MAIMIN.

KNIFE GUARD AND STRIPPER FOR CLOTH cunme MACHINES.

APPLICATION FILED OCT- 4, l9l5. I Patented Dec. 12, 1916.

3 SHEETS-SHEET l.

lNVE/VTOR ATTORNEY 1 11. s. IVIAIMIN.

KNIFE GUARD A ND STRIPPER FOR CLOTH CUTTING MACHINES. APPLICATION FILED OCT. 4. 1915.

mW /m, Patented D66. 12,1916.

3 SHEETS-SHEET 2.

D; S. MAIMIN.

KNIFE GUARD AND STRIPPER FOR CLOTH CUTTING MACHINES.

APPLICATION FILED OCT. 4, l9l5.

LQWJWU; Patented Dem-2,1916.

3 SHEETS-S HEET 3- I VE/VTOR M We.

14 T TOR/V5 VS DAVID S. MAIMIN, OF NEW YORK, ].\T. Y.

KNIFE-GUARD AND STRIPPER FOR CLOTH-CUTTING MACHINES.

To all whom it may concern Be it known that I, DAVID S. 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 Knife- Guards and Strippers for Cloth-Cutting Machines; and I do hereby declare the following to b 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.

The knife of a cloth cutting machine of the character herein referred to requires very frequent sharpening. The machines are used for long cuts, so that the operator is obliged to stop the machine a number of times in a single out, to raise the guard and apply a sharpening implement to the edge of the knife blade. The wear on the blade is excessive and the knife must be frequently renewed. With the ordinary type of guard and stripper-foot so mounted on the frame of the machine as to be capable only of vertical adjustment, it is difficult to remove the knife blade, which 'must be withdrawn through the bottom of the base plate. A type of machine has been on the market in which this difficulty has been overcome by mounting the guard and stripper-foot so that they may be swung to one side of the line of out. This permits'the ready removal of the blade but the guard and stripper-foot stands somewhat in the way of the sharpening tool, making the sharpening operation difiicult, and the construction prohibits the use of a stripper-foot which extends any substantial distance behind the front edge of the knife, since the stripperfoot must closely embrace the knife and such rearward extension of 'a stripper-foot closely embracing the edge of the knife is not possible, if the stripper-foot is to be swung to one side.

The object of the present invention is to overcome these difficulties and to provide a simple, durable and efiective combined guard and stripper-foot which may be so manipulated as to entirely clear the front edge of the knife, which may be so manipulated without altering the adjustment of the stripper-foot with respect to its pressure on the cloth, and which has a factor of safety not present in any prior machines of which I am aware. This factor of safety arises from the fact that my improved Specification of Letters Patent.

Application filed October 4, 1915.

Patented Dec. 12, 1916.

Serial No. 54,067.

stripper-foot embraces the knife-holding standard and the knife blade back and front and at the sides, and is so far extended in front of the knife and back of the standard that it will effectively hold down the cloth at the whole region of the out. In all such machines, in which vertically reciprocating knife blades are employed, the tendency is for the knife blade to lift the cloth on its upward movement. The stripper-foot is provided to overcome this tendency, but the prior stripper-feet, which are extended only about the knife blade and the front part of the standard, have not fully effected the purpose, so that the operators have been obliged to supplement the action of the stripper-foot by holding down the cloth with their hands. This necessarily brings the hand of the operator into close relation with the knife blade and leads to accidents. Such accidents are largely avoided by my improvement, which relieves the operator from this necessity of supplementing the action of the stripper-foot. Furthermore, in the preferred form of my invention hereinafter illustrated and described, my improved guard, being made of two parallel guard members on opposite sides of the line of cut, constitutes a relatively large skeleton guard which is very effective from a point of view of safety, and conceals the knife blade to a minimum degree. So also, in this improved form, convenient provision is made for effectively applying the stripperfoot to the cloth with the desired pressure, and the combined guard and stripper-foot is easily lifted and may readily be removed from the machine for repair. This preferred form of the invention is illustrated in the accompanying drawings in which.

Figure 1 is a side elevation of the complete machine, Fig. 2 is a front elevation, Fig. 3 is a section on the line 33 of Fig. 1, showing the relation of the stripper-foot to the knife and standard, Fig. 4 is a detail, in elevation, at 4-4 of Fig. 3, Fig. 5 is a detail partly in section of the carrier member of the guard and the cooperating parts of the frame, and Fig. 6 is a section on the line 66 of Fig. 5.

The machine has a base plate 1, a standard 2, a motor frame 3, a handle 4, and a knife 5 of standard construction. A rack6 is secured to the front of the motor frame and is embraced by the carrier member 7 of the combined guard and stripper-foot,

which member embraces the rack 6 and is vertically adjustable thereon, engagement between the rack and the carrier'being effected by the spring-pressed pawl S provided with a handle 9. The two guard memberslO and 11 are secured to the carrier by pivot pins 12 carrying pinions 13 which mesh with one another so that the guard members will move in unison. A coil spring 14 is connected at itsends to these pinions, as shown in Figs. 1 and 2, and acts to hold the guard members in the position to which they have been brought by the operator, hat-is, either the depressed position as shown in full lines in Fig. 2 or the elevated position as shown in dotted lines in Fig. 2. The blade "springs 15 may be employed, as shown in Fig. 2, to supplement the action-of the spring 14 when the guards are in elevated position. The ends of these springs take over the'projections 16 on the guard members, as shown in Fig. 2.

Secured to the lower extremities of the

guard members

10 and 11 are the two

complementary sections

17 and 18 of the stripper-foot, and from Figs. 3 and a it will be seen that the stripper-foot closely embraces the knife and standard and extendsalong the line ofthecut in front of the knife and behind the standard, so as to hold down the cloth throughout the whole region of the cut, for the purpose described. The stripper-foot section 18 is extended'in front of the knife and at a slight angle to the line of cut, so that its forward edge will lie on that line and serve as'a guide so that the operator may easily follow the line marked on the goods. The stripper-foot section 17 carries apin 19 which'is positioned, when the guard members are depressed, to pass through a bearing in the section 18, as shown in F ig. 3, and this section 18 carries a spring-pressed pawl '20 adapted to engage a notch'2l in the pin 19 and provided with an operating handle 22. i

It will be understood that when the ma chine is in use, the operatoradjusts the stripper-foot to put the desired pressure on thecloth, by pressing down on the carrier 7, the pawl 8 slipping easily over the'rack 6 anclflocking the stripper-foot in the desired position. When it is desired to vary this pressure, the pawl is pulled out by means of the handle 9 and set into another notch of therack as may be desired. When the operator desires to sharpen the blade, or to remove it, he manipulates the handle 7 22'to withdraw the pawl 20 from nctch 21 in pin 19, and swings the members of the guard outwardly ina vplane normal to the line of cut, and upwardly into the position shown in dotted lines in Fig; 2. In this position; the members are held by the spring 1'4: and the springs 15. This operation can be carried on without disturbingthe pressure adjustment of the stripper-foot, and when the sharpening operation has been completed the guard members may be swung down into the original position without any alteration of such pressure and without the necessity of any adjustment thereof. The carrier may be readily removed, with the combined guard and stripper-foot, by slipping it off of the lower end of the rack.

lvhat I claim is:

1. In a cloth cutting machine having a knife and a knife-holding standard, a combined knife guard and stripper-foot havingv a pair of separate guard members pivotally supported to swing away from the path of the knife in a plane substantially normal thereto, and two complementary stripper-foot sections carried by the guard member and shaped to embrace the knife and knife-holding standard and extended in front of the knife and behind the standard to effectively hold down the cloth at the whole region of the cut.

2. In a cloth cutting machine having a knife and a knife-holding standard, a combined knife guard and stripper-foot having a pair of separate guard members pivotally supported to swing away from the path of the knife in a plane substantially normal thereto, and two complementary stripperfoot sections carried by th guard member and shaped to embrace the knife and knifeholding standard and extended in front of the knife and behind the standard to effectively hold down the cloth at the whole region of the cut, one of the stripper-foot sections being extended to form a guiding finger. v

3. In a cloth cutting machine having a knife and a knife-holding standard, a stripper-foot consisting of two complementary sections shaped to embrace the knife and knife-holding stand-ard and extended to overlie the uncut cloth in front of the knife and also to overlie the cut cloth behind the standard, to effectively hold down the cloth in the whole region of the cut.

4. In a cloth-cutting machine having a knife and a knife-holding standard, a stripper-foot consisting of two complementary sections shaped to embrace the knife and knife-holding standard and extended to overlie the uncut cloth in front ofthe knife and also to overlie the cut cloth behind the standard, to effectively hold down the cloth in the whole region of the cut, one of the sections being extended to form a guiding finger.

5. A knife guard for cloth cutting machines having a pair of separate guard members pivotally supported to swing away from the knife to fully expose its edge for sharpening, and stripper-foot members carried by the guard members and engagbase plate, a knife holding standard and a motor frame, a rack secured to the motor frame, a guard carrier member embracing the rack and provided with a spring-pressed pawl to engage the rack, a pair of guard members pivotally connected to the carrier to swing away from the line of cut, and stripper-foot sections carried by the guard members and engaging the cloth on opposite sides of the line of out.

In testimony whereof I aflix my signature.

DAVID S. MAIMIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0.