Year: 1890

page_text: Fig. 23 is a plan view of the other end of the bridge, showing a section of a metal
plate in blank to be engraved ; and also showing a similar gauge;
Fig. 24 is a plan view of an adjustable gauge applied to the under side of the
bridge;
"
Fig. 25 is a section of the same on the line 25, 25 of Fig. 24; and
Fig. 26 is a section on the line 26, 26, of Fig. 24.
Referring to the letters upon the drawings Figs. 1 and 2-A indicates a table top
of suitable dimensions, and suitably supported in position for receiving a map, chart,
or other guide A¹, to be followed in engraving a metal plate A¹.
B indicates two frame pieces for supporting the tracks C upon which the bridge D
slides back and forth on suitable runners at its ends. The track at the left-see
Figs. 19 and 21--is shaped on its surface like an inverted V, and the track runner D'
at that end of the bridge is similarly shaped on its bearing surface so as to
saddle on to the track which then forms a guide to direct movements of the bridge
in a right line.
E indicates endless screws mounted in bearings F supported on the frame pieces.
These screws are provided at their rear ends with bevel gears G, connecting with hevel
gears H upon a shaft I at the rear supported in suitable bearings K.
L is another bevel gear, upon one end of the shaft I, gearing with another bevel
gear M on a shaft N, at the right-see Fig. 2-supported in suitable bearings:0.
P is a bevel gear upon the front end of the shaft N. Q is another bevel gear on a
short shaft Q, in line with shaft N, supported in a suitable bearing S. T is a front
shaft mounted in suitable bearings Ú, and provided with a bevel gear V, between and
meshing with the bevel gears P and Q.
W is a crank upon shaft Q¹, and X is a ratchet-lever of well-known pattern applied
to the shaft T.
Nuts Y, upon the screws E, are secured to the bridge runners in any suitable manner,
so that as the screws are turned in different directions, the bridge will be caused to
travel on its tracks to and fro. The nuts Y are split and provided with clamping
screws in the usual way to compensate for wear.
When it is desired to move the bridge rapidly, or a long distance in either direction,
the crank W is employed to rotate the screws rapidly by means of the gearing just
described. But when only slight movement of the bridge is required, the ratchet-lever
is used to rotate the shaft T.
The bridge carries the engraving mechanism and guide, or station-indicating or
compensating mechanism, and mechanism for adjusting these two devices, the engraving
mechanism always being adjusted to correspond relatively with the position of the
indicating mechanism. The bridge is slotted vertically and longitudinally to receive
an endless band running over a fixed pulley e mounted in the slot of the bridge,
and an adjustable pulley d mounted on a screw-threaded rod e provided with.a nut f,
and projecting through the end support of the bridge, so that by turning the nut, the
tension of the endless band may be adjusted. To the upper part of this endless band
is secured the carrier g of the engraving mechanism. To the lower part of the band
is secured a rod h, adapted to slide in the longitudinal vertical slot of the bridge, and
which carries the indicating mechanism. By this arrangement, whenever the indicating
mechanism is moved in one direction, the engraving mechanism will be moved in the
opposite direction, exactly the same distance.
The bridge is provided with another longitudinal slot Z through one side, and the
bracket i for supporting the indicating mechanism extends through this slot, and is
secured to the rod h in any usual way, as by a screw a.
The details of this indicating mechanism are best shown in Figs. 16, 17, and 18,
where indicates a bar integral with or secured to the bracket i in any suitable
manner. This bar supports a block m, provided with a set-screw n, so that it may be
adjusted lengthwise of the bar to any desired position, and then secured in place by
the set-screw. The bar also carries another block o provided with a set-screw p
which bears upon a coiled spring 7 that in turn bears upon a small vertically sliding
block p¹ resting at its lower end upon the bar. The set-screw regulates the tension

page_text: of the spring and so the pressure of the block pl upon the bar. These blocks are
each provided with a lug 7, the one on the block o being female screw-threaded to
receive an endless screw r. When the block m is fixed in place the block o can be
moved to and fro on the bar by simply unfastening its set-screw and operating the
endless screw r, by means of its thumb-piece r'. The block o is cut away on its under
side leaving lugs s which form bearings for an endless screw t, provided with a thumb-
piece u for operating it. Supported on this endless-screw is a female screw-threaded
holder projecting downward and supporting the pointer w. This pointer is made
adjustable up and down within the hollow part of the holder, and can be secured at
any desired elevation by means of a set-screw x. By the mechanism described the
pointer can not only be raised or lowered at will, but it can be moved on a line
parallel with the bridge by sliding the block o upon the bar, or in a direction at right
angles to the bridge by means of the endless-screw t. Besides this it of course
partakes of all the movements of the bridge, and of the rod h. When it is desired
to move the station-indicating mechanism over long distances it is accomplished by
moving the endless-band and the rod h, or the bridge, or both. The nicer
adjustments are to be employed, for example, to compensate for any variation in the
guide or chart.
Sometimes contraction or expansion takes place, under different atmospheric con-
ditions, in paper charts serving as guides for engraving plates, and hence, after making
each figure, it is necessary to make some slight adjustment of the pointer before
setting the apparatus and proceeding to engrave another figure.
9
Referring now to the engraving mechanism, the carrier y is composed of two parts
hinged together, one part being secured to the endless-band and supporting the
standard, and the other part supporting the engraving tool and the mechanism
connected with it-see Figs. 4, 5 and 6. The object of having the carrier in two
parts hinged together, is that the operator may swing open one part carrying the
engraving mechanism, thus removing it out of the way, so that he can view his work
on the plate. without moving the bridge.
B2 indicates a hand-screw for securing the hinged part to the fixed part, and for
conveniently releasing it when it is desired to swing it open.
The standard z supports a two-part nut A2 which engages with an endless-screw (2,
resting at each end in suitable bearings, see Fig. 1. The two parts of this nut are
adapted to slide away from each other, so as to free the nut from engagement with the
screw, and then to come together again so as to clamp the screw. A pivoted cam-
lever D² is employed to operate the parts of the nut in the usual way; but we claim
no novelty either in the nut, or its operating mechanism, and therefore have not
illustrated them in detail, as they are well known.
The standard also carries a disk E² notched on its periphery to serve as a guide for
the adjustment of the pattern plate F2 which is supported on the disk. This pattern
plate is held in position by means of a washer G2, and a thumb-nut H2. It carries
underneath its margin a block I², secured in place by means of a thumb-nut K², so
that it may be detached. This block is slotted on its under side to receive a latch L³,
pivoted at M², and provided with a handle N2 for operating it. The inner end of this
latch is adapted to engage with the notches on the margin of the disc E, and to be
released from them at will, and the notches serve as guides for rotating and setting
the pattern plate. There may be a variety of such disks differently notched so as to
give, by applying one or another, a great many different adjustments of the pattern
plate. The pattern plate.has cut on its face, near the margin, Fig. 3, in reverse, the
figures or forms to be cut in the metal plate beneath, and of course different pattern
plates are to be employed to correspond with the different figures or designs to be
engraved. Corresponding small index figures are cut near the inner margin of the
plate on the same radial lines to aid in the rotary adjustment of the plate in connection
with the arrow.
02 indicates the pivoted shaft of the engraving tool, provided with a removable hollow
handle P2 for guiding the point Q upon the pattern plate and effecting the movements
necessary to engrave. the desired figure by means of the engraving point or

page_text: cutter R2, in the lower end of the shaft, which bears at its upper end against a
screw R³, to compensate for wear of the cutter, the screw being screwed down as the
cutter wears off.
P1 indicates a stud projecting from the side of the upward extension of the
shaft, adapted to enter the L-shaped slot Q of the hollow handle and form a
bayonet joint, so that the handle can be removed.
When the stud P¹ enters the horizontal part of the slot it will prevent the
handle from slipping off, and the point Q2 from raising off from the pattern plate.
The cutting point K2 will then be held out of contact with the plate A'.
When the stud P¹ is in the vertical part of the slot, then the engraving point R³
will be down upon the plate.
The point slips freely up and down in the hollow part of the upper extension
of the engraving shaft, but is secured by means of screw rigidly in the upper part
of the hcllow handle P2, and always moves up and down with the handle. By this
construction and the employment of the spring Z2, and the slotted block ², and ratchet-
lever, and rack a² on the engraving shaft, we provide for holding the point Q² in
place on the figures in the engraving plate; notwithstanding the engraving shaft
and cutter R2 may move up and down owing to inequalities on the surface of a plate
heing engraved. This is a very important feature of our invention, because it enables
the tool R² to cut uniformly over all inequalities on the surface of an engraving plate,
and still the point Q always remain in the same horizontal plane unaffected by the
vertical movements of the cutter R2 and engraving shaft.
S2 is a
lifting hand-piece attached to the U-shaped part T2 of the shaft, by
means of which the engraving tool may be raised when desired out of contact
with the metal plate beneath, and the point Q2 out of contact with the pattern
plate.
U represents frame pieces forming parts of the hinged part of the carrier, and
having guide-ways V2 on their inner sides, forming vertical bearings for the slide-
blocks W2, which are provided with set-screws W₁ to secure them in place after
adjustment. Secured to these blocks are the ball bearings X2 carrying the ball Y
through which the shaft loosely passes.
Zindicates coiled springs on either side of the shaft secured at their lower
ends to the ball, and at their upper ends to a block through which the shaft
passes.
The annular rack a² is formed on the shaft, and the pivoted ratchet-lever b
is applied in a slot in one side of the block 2, so as to engage, by its teeth i²,
with the rack and raise the block, stretch the springs, and adjust the spring tension
as desired. c² indicates a push-rod within the handle of the ratchet-lever, provided
with a spring d², tending to press the rod outward. To the inner end of the
push-rod is pivoted a pawl e², which in turn is pivoted to the handle of the
ratchet-lever, and adapted to engage with the teeth 92 on the block h².
By pressing on the outer end of the push-rod, the pawl will be disengaged,
so that the ratchet-lever may be lowered, and then stopped in any desired
position. The spring d² tends to keep the pawl e² in engagement with the teeth g²
of the block.
When the ratchet-lever is down, as shown in Fig. 7, the plain part k² of the
inner end of the lever will be opposite the rack, so that the teeth, and the block ²
will be disengaged from the rack, and then the shaft can be withdrawn.
indicates a standard which supports a curved segment m³, adapted to be
adjusted up and down upon the standard by means of set-screw n²-see Figs. 6 and 12.
This segment is provided with a number of stops o³, which project through the
curved slot in the segment, and are adjustable to different positions. These stops
are intended to limit the movement of a ratchet-lever p² which is applied to one
end of the endless screw (2, to rotate it, for the purpose of changing the position
of the engraving tool, and the indicating mechanism when their positions are required
to be only slightly altered in a line parallel with the bridge. By adjusting the
stops in different positions, the oscillating movements of the ratchet-lever på are

page_text: limited, and the turn of the endless screw C³ is regulated. By adjusting the segment
up or down on its standard, we provide another means for regulating the
oscillating movement of the ratchet-lever without changing the adjustments of the
stops. Thus, by the two means just described, we can adjust the oscillating move-
ments of the ratchet-lever with great nicety to control the turning of the endless-
screw C³, and consequently the relative movements of the engraving and indicating
mechanism.
In Fig. 14 the details of the adjustable stops are shown. q2 indicates a hollow
screw provided with a head 2, and adapted to extend through the curved slot in the
segment m².
32 is a nut fitting on the opposite end of the screw, by means of which the stop
is clamped to the segment in any desired position.
t2 is a movable stop-rod extending through the hollow screw 92, and provided with
a coiled spring ³, tending to keep the stop-rod in the position shown in the full
lines, Fig. 14. It can be pushed forward to the position shown in the dotted lines
in that figure, and then it acts as a stop for the ratchet-lever p². f is a head on
the end of the stop-rod to prevent the spring from throwing it out of the
screw q².
u2 indicates two fixed stops which may be projections of any form from the front
side of the segment m².
In practice the movable stops are set in such positions as to permit appropriate
oscillating movements of the ratchet-lever for turning an endless screw to make the
different spacings between letters or figures to be engraved; thus, for example, the
movement of the oscillating lever from one fixed stop to the first movable stop would
cause the movements of the engraving mechanism, and the station-indicating mechanism
far enough to leave a certain small space on the engraving plate after one figure had
been engraved before another should be engraved.
Again a movement of the oscillating lever from the same fixed stop to the second
movable stop would result in such movements, by the turning of the endless-screw,
as to leave a greater space between two figures to be engraved, and so on.
Each
movable stop permits an oscillation of the ratchet-lever for turning the endless-screw
over a greater distance than the preceding stop. These stops are suitably marked on
their heads in practice so as to indicate the spacings that their use respectively will
effect when they are properly adjusted. The result is that the workman has only to
push on the head of a given stop marked to show him what will be the result so as
to project its opposite end against the tension of its spring into the path of oscillation
of the ratchet lever, and then use the ratchet-lever to turn the endless-screw. By
this means he will always effect the spacing desired with speed and exactness, the
stops having been all adjusted properly in the beginning.
2 is a split-bearing for the endless-screw (", provided with a clamping-screw w² to
clamp it around the journal of the screw, so as to prevent the screw from turning
backward after it has been turned in one direction by the use of the ratchet-lever p².
In order to gauge the plate exactly and quickly with the chart, serving as a
guide for engraving the plate, we provide points-see Figs. 1, 2, 22, 23, 24, 25
and 26-supported by suitable mechanism connected to the lower part of each end of
the bridge.
x²-Fig. 25-indicates a holder straddling the lower side of the bridge, and secured
thereto by a set-screw y², and gib or bearing-plate 22. Secured to this holder, in any
suitable way, and projecting forward of the bridge, is an arm A³, carrying a hollow
sliding block B, and a set-screw C³, adapted to hold the block in any position to
which it may be adjusted on the arm. D³ is a pointer movable up and down in its
place, being held merely by friction. Any other form of parts to serve the purpose
might be employed.
By aid of these pointers the charts and plates may be quickly and reliably placed in
proper position, and the pointers will indicate whether they remain so during the work
of engraving the plate.
By means of the improved mechanism described, all of the exact adjustinents, and

page_text: safeguards required to make a true plate for printing a map or marine chart, or such
parts of it as this apparatus is adapted to make, can be quickly and reliably secured,
so that the work can be done rapidly, and with great economy, without the aid of an
expert engraver. Furthermore all of the mechanism is simple, durable, and not likely
to get out of order.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:
1
1. In an engraving apparatus, the combination with a frame, of two endless screws
mounted on either side and geared together at the rear by a shaft I, and end shaft N
geared with the shaft I, a short shaft Q', geared with the shaft N and provided with
a crank, a shaft T geared with the shafts N and Q' and provided with a ratchet-lever,
and a bridge connected at its ends by means of nuts Y with the endless screws, and
tracks for supporting the bridge runners, one of them serving as a guide, whereby the
bridge may be moved back and forth in a right line at different speeds, substantially
as set forth.
2. In an engraving apparatus, the combination with the longitudinally and vertically
slotted bridge, of an endless-band mounted in the slot, the carrier for the engraving
mechanism secured to the upper part of the band, and a slide-rod within the bridge-
slot secured to tlie lower part of the band, substantially as set forth.
3. In an engraving apparatus, the combination with the longitudinally and vertically
slotted bridge, of an endless-band mounted in the slot, the carrier for the engraving
mechanism secured to the upper part of the band, a slide-rod within the bridge-slot
secured to the lower part of the band, and a screw upon which one of the band-pulleys
is mounted, provided with a thumb-nut, whereby the tension of the band can be
regulated, substantially as set forth.
4. In an engraving apparatus, the combination with the slotted bridge carrying in
its slot the endless band on which the carrier is mounted, and the slide-rod carrying
the station-indicating. mechanism, of an endless-screw (2 engaging a nut on the
carrier, and mechanism for turning the endless-screw, substantially as set forth.
5. In an engraving apparatus, the combination with a frame, of two endless screws
supported on the frame, a bridge connected by nuts at its ends with the endless-screws,
and supported upon tracks parallel with the screws, one of which tracks serves as a
guide for the movements of the bridge, and engraving apparatus and station-indicating
apparatus carried by the bridge, substantially as set forth.
6. In an engraving apparatus, the combination with a frame, of two endless screws
supported by the frame, a bridge connected by nuts at its ends with the endless
screws and provided with tracks parallel with the screws, and a gauge projecting
from one side of the bridge at each end of it, and a station-indicating mechanism and
an engraving mechanism carried by the bridge, substantially as set forth.
7. In an engraving apparatus, the combination with a frame, of tracks thereon, a
bridge supported by the tracks, an engraving and station-indicating mechanism
supported by the bridge and connected by gearing so as to be moved simultaneously
in opposite directions on the bridge, and mechanism for moving the bridge forward
and back, substantially as set forth.
8. In an engraving apparatus, the combination with a bridge movable back and
forth, of engraving mechanism and station-indicating mechanisin upon the bridge,
and adapted to move with the bridge, gearing supported by the bridge and adapted
to move the station-indicating mechanism and the engraving mechanism to and
fro upon the bridge simultaneously in opposite directions, substantially as set
forth.
9. In an engraving apparatus, the combination with the bridge, of the carrier
composed of two parts, one supporting the standard and pattern plate and connected
mechanism, and the other supporting the pivoted engraving shaft and its connected
mechanism, substantially as set forth.
10. The combination with the engraving shaft and its ball and socket joint

page_text: mechanism, of the springs Z³, the block slotted and toothed, as shown, and a
ratchet lever pivoted to the block and operating upon a rack on the shaft, substantially
as set forth.
11. The combination with the engraving shaft, provided with the engraving
point R2 at its lower end, and the guide point Q, the pattern plate, the notched
disk under the pattern plate, and the latch or stop mechanism secured to the pattern
plate and adapted to engage with the notches in the disk to determine the rotary
movement of the pattern plate, substantially as set forth.
12. In an engraving apparatus, the combination with the bridge and the engraving
and station-indicating mechanism, of the endless screw C2, the standard 12, vertically
adjustable segment m² provided with stops u² and o², and oscillating ratchet-lever p²,
substantially as set forth.
13. In an engraving apparatus, the combination for moving the engraving
mechanism, of an endless screw connected therewith, a ratchet-lever for rotating the
screw, and adjustable stops to limit the oscillating movements of the lever, substantially
as set forth.
14. In combination with the segment m², the fixed stops u³, and the adjustable
stops o², substantially as set forth.
15. The combination with the bridge and the slide-rod h, of the bar Z secured to
the slide-rod, the bar k projecting parallel with the bridge and carrying the blocks m
and 0, and the endless-screw r, substantially as set forth.
16. The combination with the bar k, of the blocks m and o, the endless screw r,
and the endless screw t carried by the block o, and the adjustable holder v adapted
to be moved by the endless-screw so as to control the point w, substantially as set
forth.
17. In an engraving apparatus, the combination with a frame, of tracks thereon,
a bridge supported at its ends by the tracks, an engraving and station-indicating
mechanism supported by the bridge and connected by gearing so as to be moved
simultaneously in opposite directions on the bridge, substantially as set forth.
18. In an engraving apparatus, the combination with the engraving shaft made
hollow at its upper end, of a hollow handle carrying the point Q and fitting over the
hollow part of the engraving shaft, an L-shaped slot in the hollow handle, and a stud
projecting from the hollow part of the shaft and adapted to enter the slot of the hollow
handle, substantially as set forth.
19. In an engraving apparatus, the combination with the engraving shaft and the.
pattern plate, of the hollow slotted handle, and the hollow upward extension of
the shaft having a stud to fit the slot in the handle, the springs Z2, the slotted
and toothed block 2, and the ratchet-lever pivoted to the block, substantially as set
forth.
20. In an engraving apparatus, the combination with the engraving shaft, hollow
at its upper end and carrying a point vertically movable within the hollow of the shaft,
of springs Z2, the slotted and toothed block 2, and the ratchet-lever pivoted to the
block, substantially as set forth.
21. In an engraving apparatus, the combination with an engraving shaft carrying
a point Q above a pattern plate, and a cutter R2 to bear upon an engraving plate, the
U-shaped bend in the shaft, whereby the point Q2 can be worked on the surface of
the pattern plate, substantially as set forth.
Dated this 26th day of August 1890.
day of August. 1890.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.