An Improved Bearing and Guide for Band or Ribbon Saws.
Year: 1898

page_text: Date of Application, 20th May, 1898-Accepted, 25th June, 1898
COMPLETE SPECIFICATION.
An Improved Bearing and Guide for Band or Ribbon Saws.
I, JACOB LUDWIG PIENING, of 5, Flammwig, Elmshorn, near Hamburg, in the
German Empire, Carpenter, do hereby declare the nature of this invention and in
whai manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
My invention relates to an improved bearing and guide for band or ribbon saws,
the object of which is to provide an improved means for preventing vertical sag or
lateral play in such a saw and to steady the same at the point nearest possible to
that at which it enters or leaves the substance being sawn.
In saws of the type in question when employed for cutting thick wood and other
material, and especially when such cutting is curved or otherwise departs from a
straight line, it is necessary that the saw be steadied at or near the point at
which it enters or leaves the said material, in order to prevent vibration
in either a vertical or lateral direction, and for this purpose such bearings
or guides as hitherto employed have all more or less operated unsatisfactorily,
especially when such bearings or guides have been of wood, it having been found
in practice that these, while acting tolerably satisfactorily at first, quickly wear
out of truth thus frustrating the object for which they were intended, and when
such bearings or guides or both have been of metal, the said guides have been
stationery, with the result that a certain amount of rubbing friction has always
existed between such stationery guides, and the saw, which naturally retarded the
good working of the latter, and accellerated the wearing out of same, but accord-
ing to my invention such objections are obviated.
Referring to the accompanying drawings, Fig. 1 is a front view or elevation of
my improved bearing and guide, partly in section, Fig. 2 being a side view of
same with one half of the guide frame removed.
In the said drawings it is assumed that the saw is moving in a horizontal
direction, and that the wood or other material (not shewn) is having a vertical
cut made therein, but it will be understood from the following description of my
invention that the same may be placed to operate in like manner when fixed in a
position at right angles to that shewn and used in connection with a saw moving
vertically.
My invention consists of a metallic or other frame a of any suitable shape or
configuration, and adapted to be screwed upon or otherwise fixed in any convenient
manner to, the frame or bench of the saw, at a point as near as possible to that at
which the saw enters or leaves the material being sawn, that being the point at
which the steadying of the saw is most needed. The said frame a has screwed
or otherwise connected thereto a pair of bearings or jaws a¹ and a², which serve as
bearings for a shaft or spindle b, carrying a steel or steel-faced disc f upon which
rests the band or ribbon saw g, the said bearings being provided with any suitable
form of lubricating device, which may be a pair of straight or other tubes such
as c and c¹.
The said shaft b also carries a hollow circular frame composed of two parts a
and d, provided with flanges e¹ and №¹, and bosses h and h¹, respectively, the latter

page_text: being provided with threaded holes, receiving suitable screws such as m and m³,
by means of which h and h¹ may be fixed upon the shaft or spindle b in such a
manner, that a clearance n exists between the opposing edges of the flanges el
and, sufficient to permit the saw g to lie easily between them, and yet sufficiently
close together to prevent any lateral play occuring to the said saw, the said parts e
and d being held in fixed connection with the disc f by the means of any number
of set-screws such as o, engaging with threaded holes in e. and d, and entering
corresponding holes p in the said disc, the said screws also serving for adjusting
the width of the gap n before tightening the screws m and m¹.
The saw g, by reason of its contact with the wood or other material being sawn,
would press with some force upon the disc f, thus causing the said disc and the
compound frame e d to travel therewith, and in the direction indicated by the
arrows in Fig. 2. the disc f thus serving to prevent any jumping or vertical play
of the saw g, while the flanges e and prevent lateral play or vibration of the
same.
The jaws or bearings a¹ and a being portable permit the easy removal of the
shaft or spindle b and either or both of the parts è and d, in order to change the
disc when required, to accommodate saws of different widths, the said disc being
preferably of such diameter that the teeth of the said saw are always clear of the
flanges e¹ and so as to prevent the possibility of such teeth becoming wedged
or jammed between and probably injured by the said flanges.
The frame e d may be of any suitable material or combination of materials, but
I prefer that the flanges thereof e and be of bronze, gun-metal or the like, or
faced with the same or like material, as I find in practice that such or like metal
wears better and offers less friction when in contact with the steel saw.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1st. A bearing and guide for band or ribbon saws consisting of a metal or metal
faced circular disc, connected to and enclosed by a compound or duplex circular
hollow frame, the said disc and frame being mounted upon a running shaft, carried
in suitable bearings, supported by a frame connected to the bench or frame of the
saw, the said disc and frame forming a rest and lateral guide respectively for the
said saw, and adapted to rotate by frictional contact therewith, substantially as
described and shewn.
2nd. The improved bearing or guide for band or rubber saws, consisting of a
frame such as a, having portable jaws such as a¹ and a², carrying freely a shaft
or spindle b, upon which is mounted a metal or metal faced circular disc f, enclosed
by and in adjustable fixed connection with a hollow frame composed of two parts
such as e d, provided with metallic or metal faced flanges e and d¹ respectively,
and in fixed connection with the shaft or spindle the said disc f and flanges e¹
and d¹ forming a rest and lateral guide respectively for the band or ribbon saw g and
adapted to be rotated by and with the movement of the said saw, substantially
as described and shewn.
GEO. THOS. HYDE,
No. 1, Broad Street Buildings, Liverpool Street, E.C.,
Agent for the Applicant.