US1919638A - Knife for thread-cutting temples - Google Patents

Description

' July 25 1933.

" KNIFE FOR THREAD CUTTING 'TEMPLES Filed May 9, 1931" N I I [4 M .[Tz vem 6 07" ti JYOULSZfFLYJ/CiVWLCDVS.

g/rf H. F. LIVERMORE' 1,919,638

Patented July 25, 1933 oar 'ars PATENT I OFFICE;

HOMER IE. LIVER/MORE, 0F BROOKLINE, IVIASSACHT ISETTS, ASSIGNOR TO .I-I. F. LIVER- MORE (30., OF ALLSIDN, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS KNIFE FOR THREAD-CUTTING TEMPLES Application filed May 9,

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

For many years it has been the custom to construct the movable knife of a well-known type of thread-cutting temple in such a manner that when the knife blades, of which there are two, become worn andneed to be replacechit'is necessary for the user to discard the entire knife and replace the same with an entire new knife, or to return the worn knifeto the manufacturer, in order that the blades may bereplaced. In

either case an unnecessary expense is in-' the flanges. It is evident that this construction is unnecessarily expensive and as far as the users are concerned, it is necessary to replace the whole knife when, as a matter offact, in most cases it is the blade only which needs replacing. Y

Another serious defect with the construction hereinbefore mentioned is that it is difficult to properly .align the two separate 1 blades and the users experience much. difficulty because of the fact that they are forced to accept knives'having blades that are improperly aligned. Furthermore, in the op eration of the knife, a lower edge portion of the arm carrying the knife blades contacts with the-temple bar and this lower edge which includes the lower edges of the three flanges and the two knife blades which, as before stated, may be improperly aligned, causes excessive wear both to the lower edge of the knife and the surface of the temple bar with which it contacts.

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 by the user without it being necessary to return the knife to the manufacturer.

1931. Serial No. 536,151.

Another object of the invention is to construct the knife blades from a single piece of steel, said blades being formed in such a manner that their cutting edges will always be in alignment both before and after the blades are attached to the. holder.

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

Referring to the drawing:'

Fig. 1' represents a side elevation of a portion of a thread-cutting temple, the knife of which is constructed in accordance with my invention, the temple roll and top mem-' her to which the roll is attached being re.- moved in order that the blade of the knife will be exposed.

' Fig. 2 is a plan view of a knife embodying my invention. V Fig. 3 is a side elevationof the knife. Fig. 4 is a transversesection taken on the line 4l4,0f Fig. 3.

Fig-5 is a perspective view of the knife blade. p

Like numerals refer to like parts throughout the several views of the drawing.

In the drawing, 6 is a temple bar, 7 a stand v and 8 a cap for the barand stand, all well 1 known in the art. A knife 9 constructed in accordance with my invention is mounted in a well-known manner upon the temple bar 6 and av spring 10 has a coil portion 11 provided thereon which is seated upon. a stud 12 which projects laterally from a side of the bar 6. An arm 13 of the spring 10 terminates in a loop 14 which iseconnected at 15 to the knife y r A stationary cutter 16 provided with a cutting edge 17 is attached to the frontpor tion of the temple bar manner. 7 y

The knife -9 embodies therein a holder'18 provided with a downwardly projecting arm 19, a pair of laterally projecting flanges 20 and another pair of laterally projecting flanges 21, all of said flanges co-operating with a corner portion of the temple bar 6 to form a pivot for the knife. The holder '6 in a well-known tion 22 embodied therein to which a blade 23 is secured. The blade 23 is constructed of sheet material and is folded longitudinally thereof to provide parallel side portions 24, each of which is provided with a cutting edge 25. A portion 26 of the blade 23, which connects the side portions 24; thereof together, constituting a bridge portion which together with said side portions forms in cross-sectional contour a U. 'lheside portions 24 of the blade 23 are provided with holes 27 which are adapted to align with similar holes provided in the shank portion 22 of the holder 18 to receive rivets 28 by means of which the blade is rigidly secured to the holder.

During the operation of the knife the holder portion 18 of said knife not only has a rocking movement imparted thereto upon the adjacent corner portion the temple bar 6, but the upper surfaces of the flanges 20 have a sliding movement upon a lower surface 2970f said temple bar and the bridge portion 26 of the knife blaC contacts with a surface30 ofthe temple bar, said latter surface constitutiong a stop and limitingthe rocking movement of the knife 9 upon the temple bar 6.

The knife 9 of this invent-ion is actuated. in a manner well known to those skilled in the art by having the arm 19 thereof engaged by the lay of a loom during its beatup movement. A rocking movement is first imparted to the kn ife, during which time the flanges 20 and 21 of the knife holder first have a rocking engagement with the adjacent corner portion of the temple bar 6. After the portion 26 of the knife blade has been moved into engagement with the surface 30 of the temple bar he action of the lay in its contact with the arm 19 is to cause the knife to slide rearwardly upon the temple bar and the cutting edges 25 of the side portions 24 of the blade will co-operate with the cutting edge 17 of the stationary cutter 16 in a manner to sever the loose end of a filling thread, if there happens tobe such a thread located between said cutters.

When the cutting edges 25 of the blade 23 become so worn that it is necessary to replace said'blade, this may be easily accomplished by removing the rivets 28 and detaching the blade from the shank 22 of the blade holder, and replacing the old blade with a new one.

It will be seen that as the blade consists of a single piece of material the cutting edges 25 of both of the side portions 24 of said blade will always be located in alignment with each other and that there is no possible chance for either of said side portions or cutting edges to get out of alignment either when being attached to the hold er or during the operation of the knife. Furthermore. as the blade 23 is constructed of a single piece of material, the bridge 26 will always be smooth, and excessive wear cannot take place between said bridge and the surface of the temple bar. Y

I claim:

A knife for thread-cutting temples comprising a single piece of sheet material folded lmigitudinally thereof to form parallel side portionsjeach provided with. a cutting edge, and a bridge portion extending longitudinally of said side portions and. connecting them together along their lower edges to form a U.

HOMER F. LIVERMORE.

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