US1981723A

US1981723A - Knife for thread-cutting temples

Info

Publication number: US1981723A
Application number: US699574A
Authority: US
Inventors: Sherwood O Dodge; Robert C Newton
Original assignee: H F LIVERMORE CO
Current assignee: H F LIVERMORE CO
Priority date: 1933-11-24
Filing date: 1933-11-24
Publication date: 1934-11-20
Anticipated expiration: 1951-11-20

Description

Nov. 20, 1934. 5 Q DODGE ET AL I 1,981,723

KNIFE FOR THREAD CUTTING TEMPLES Filed Nov. 24, 1953 V i9 [rzzxcru (307117 I She/"wood 0 Dodge. 31, 59 v K3013627 6 C Nezuorl.

Patented Nov. 20, 1934 1,981,723 KNIFE non THREAD-CUTTING TEMPLES Sherwood 0. Dodge, Medford, and Robert C. Newton, Needham Heights, Mass., assignors. to H. F. Livermore Co., Allston, Mass, a corporation of Massachusetts Application November 24, 1933, Serial No. 699,574

5 Claims.

This invention relates to an improvement in knives for thread-cutting temples.

Certain types of'knives for thread-cutting temples have two cutter blades embodied therein 10- 5 cated upon opposite sidesof a blade holder. It

is important that'these blades be correctly positioned upon the holder and that the cutting edges thereof shall align accurately with each other. In certain of these constructions when knife 10 blades become worn and have to be replaced, it

is necessary for the user to discard the entire knife or return the Worn knife to the manufacturer in order that the blades may belreplaced. This is made necessary because of the fact that the blades are both pinned and fused in slots provided therefor in the holder. It has been found that it is impractical to rely solely on pins or rivets for holding the knife blades in the holder because of the fact that all of the strain falls on the pins or rivets with the result that the blades often become loosened. Fusing the blades to the holder increases the cost of the knife and renders it unnecessarily expensive, as it makes it necessary to replace the whole knife when as a matter of fact in most cases it is the blade only which needs replacing. Another serious defect with certain well-known knives is that it is difficult to properly align the two separate blades, and the users are obliged to accept knives having blades that are improperly aligned.

'The object of this invention is to provide an improved knife for a thread-cutting temple constructed in such a manner that when the blades become worn they may be easily removed from the blade holder and replaced with new blades accurately positioned in the holder and secured therein by the user without itbeing necessary to return the knife to the manufacturer.

Another object of the invention is to provide a knife having a blade holder of novel construction embodied therein in which the blades, also of novel construction, may be accurately positioned and secured byrivets in such a manner that the strainiwhich theknife is called upon '45 to withstand is effectively distributed between the blades, the holder and the rivets and not for the most part borne by the rivets.

Still another object of the invention is to provide a knife in which the cutter blade may yield 250 with respect to a stationary blade to provide an effective thread-severing action.

The invention consists in an improved knife for thread-cutting temples as set forth in the following specification and particularly as pointed out in the claims thereof.

Referring the drawing:- Fig. 1 represents a side elevation of a blade holder for a knife embodying the invention.

Fig. 2 represents a side elevation of a knife V blade.

Fig. 3 is a side elevationof the assembled knife for thread-cutting temples embodying the invention.

Fig. 4 is a plan view of the assembled knife.

Fig. 5 isa side elevation of a knife constituting a modified embodiment of the invention.

Fig. 6 is an elevation of the rear face of a type of temple in which the knife of Fig. 5 is utilized.

. Figs. 7 and 8 are side elevations of the blades utilizedin the structure of Fig. 5. I

Likenumeral's refer to like parts throughout the several'views of the drawing. In the drawing, referring particularly to Figs. 1 to' 4 inclusive, 10 represents a knife for threadcutting' temples comprising a holder 11 embodying therein a body portion 12 having a downwardly projecting arm 13, a pair of laterally projecting flanges '14, and another pair of laterally projecting flanges 15 formed integral therewith. The

flanges

14 and 15 are constructed in a well-known manner to co-operate with a corner portion of a temple bar not illustrated in thedrawing but well-known in the art to form a pivot for the knife. v

Locatedwithin each of the opposite vertical faces 16 and 1'7 of the body portion 12 of the holder 11 is an arcuate groove or recess 18 which is adapted to receive a knife blade 19. Extending through the body portion 12 between the faces 16 and 17' thereof are holes 20 which intersect the edges of the recesses 18 in a manner to form notches21 in the opposite sidewalls of said recesses. The notches 21 are provided for the purpose of receiving ears 22 formed upon the knife blade 19, said ears being 'a snug fit within said notches and said notches and ears cooperate to accurately position both of the knife blades 19 upon the holder 11, so' that said blades will accurately align with each other. The blades 19 v are secured in unison in their respective recesses 18 by rivets 24 which'extend through

holes

25 and 26 provided therefor in the blades 19 and holder 11 respectively. It will be understood that the ears 22 and notches 21 co-operalte to accurately position the blades 19 upon the holder 11 and the strain incidental to operation is distributed between the various co-operating portions of the structure and is not all borne by the rivets.

When the cutting edge portions 2'7 of the blades 19 have been ground away to such an extent that it is necessary to replace the blades, all that is necessary is to remove the rivets 24 which may be accomplished in a manner well known to those skilled in the art and the worn blades replaced with new blades which will be accurately positioned upon the holder on account of the interengagement of the cars 22 with the co-operating notches 21.

In Figs. 5, 6, '7 and 8 we have illustrated a modified embodiment of our invention in which 28 represents a holder for a knife blade 29, illustrated in detail in Fig. 6, and for another blade 30, not necessarily a knife blade, which is illustrated in detail in Fig. 7. The holder 28 is similar to the holder 11 hereinbefore mentioned, differing therefrom only in outline, and embodies therein a body portion 31, in each vertical face of which is a groove or recess 32. Extending through the body portion 31 from face to face thereof are holes 33 which intersect the edges of the recesses 32 in a manner to form notches 34 in the opposite edges of said recesses. The notches 34 are provided for the purpose of receiving ears 35 formed upon the

blades

29 and 30, said ears being a snug fit within said notches, and said notches and ears co-operate to accurately position both of said blades upon the holder 28. The portion of the edge of the

blades

29 and 30 which is not contacted with the edge of the recess 32 at the notches 33 is separated from said edge by a narrow space. The

plates

29 and 30 are secured in unison in their respective recesses 32 by rivets 24. In this form of the invention the strain incidental to operation is distributed between the various co-operating portions of the structure and only a small part is borne by the rivets.

The knife of Fig. 5 is mounted in a well-known manner in a guideway 36 provided in the top 3'7 of a temple head, see Fig. 6, and the knife blade 29 co-operates with a stationary knife blade 38 in a well-known manner to perform the thread severing operation. A depending end portion 39 of the knife blade 29, Which has the cutting edge thereon, is bent toward the stationary knife blade 38 in order that there will be a yielding shearing movement of the blade 29 during the threadsevering operation.

The blade 30 rests against a face of a plate 40 also mounted on the top 37 of the temple head, said blade 30 having yielding contact with said plate. The stationary knife blade 38 and plate 40 are secured to the top 37 by a screw 41. The outer extremity of the blade 30 is bent toward the stationary knife blade 38 at 42.

In the operation of the device there is sufficient resiliency to the

blades

29 and 30 to provide an effective yielding shearing action between the movable knife blade 29 and the stationary blade 38. The plate 40 may be forced laterally toward the blade 30 to force the latter laterally toward the blade 29 by an adjusting screw 43 which is mounted in the top 37 of the temple head, in which event the pressure of the movable knife blade 29 upon the stationary blade 38 may be increased or diminished as desired.

We claim:

1. A knife for thread-cutting temples comprising, in combination, a blade holder provided with a recess in a face thereof, said holder also having holes comprising laterally projecting extensions for said recess embodied therein, and intersecting the sides of said recess and a blade mounted in said recess and embodying therein ears projecting into and fitting said extensions, whereby said blade is accurately positioned upon said holder at said extensions.

2. A knife for thread-cutting temples comprising, in combination, a blade holder provided with recesses in the opposite faces thereof and with holes extending therethrough from face to face and communicating with said recesses at opposite edges of the latter to form laterally projecting extensions therefor, and blades mounted in said recesses and embodying therein ears projecting into and fitting said extensions, whereby said blades are accurately positioned in alignment with each other upon opposite sides of said holder.

3. A knife for thread-cutting temples comprising, in combination, a blade holder provided with recesses in the opposite faces thereof and with holes extending therethrough from face to face and intersecting the edges of said recesses thereby forming notches in said edges, and blades mounted in the recesses and embodying therein ears projecting into and fitting said notches, whereby said blades are accurately positioned in alignment with each other upon oppositesides of said holder.

4. A knife for thread-cutting temples comprising, in combination, a blade holder provided with recesses in the opposite faces thereof and with holes extending therethrough from face to face and intersecting the edges of said recesses thereby forming notches in said edges, and blades mounted in the recesses and spaced apart from the edges thereof, said blades embodying therein ears projecting into and fitting said notches, whereby said blades are accurately positioned in alignment with each other upon 0pposite sides of said holder.

5. A thread-cutting temple for looms including a temple head provided with a guideway therein, a stationary knife blade at one side of said guide- Way, a plate at the other side of the guideway opposite said stationary blade, and a movable knife positioned in the guideway and embodying therein a pair of parallel resilient blades spaced apart laterally and yieldable relatively to each other, one of said resilient blades co-operating with the stationary knife blade to perform the thread-severing operation and the other resilient blade yieldingly engaging said plate and holding the thread-severing blades in yielding engagement with each other.

SHERWOOD O. DODGE. ROBERT C. NEWTON.