U.S. patent application number 10/899601 was filed with the patent office on 2006-02-02 for narrow aerial and die-mount cams.
This patent application is currently assigned to Anchor Lamina America, Inc.. Invention is credited to Erich D. Fidziukiewicz.
Application Number | 20060021417 10/899601 |
Document ID | / |
Family ID | 35694698 |
Filed Date | 2006-02-02 |
United States Patent
Application |
20060021417 |
Kind Code |
A1 |
Fidziukiewicz; Erich D. |
February 2, 2006 |
NARROW AERIAL AND DIE-MOUNT CAMS
Abstract
Narrow aerial and die-mount cams, each having a cam adapter, a
driver and a slide sandwiched between the cam adapter and driver.
The narrow aerial cam slide has an elongate primary portion that
has a T-shaped cross-section and has a primary bearing surface, and
the cam adapter has a rectangular recess. An elongate keeper plate
having a longitudinal slot is secured to each side of the cam
adapter adjacent the rectangular recess to slidably retain the
primary portion of the slide within the longitudinal slots and the
rectangular recess. The primary bearing surface and a pair of
intermediate bearing surfaces formed in the slide below the primary
portion slidably support the keeper plates and thus the cam
adapter. The driver slidably supports the slide. The narrow
die-mount cam is basically an inverted version of the aerial
cam.
Inventors: |
Fidziukiewicz; Erich D.;
(South Lyon, MI) |
Correspondence
Address: |
BROOKS KUSHMAN P.C.
1000 TOWN CENTER
TWENTY-SECOND FLOOR
SOUTHFIELD
MI
48075
US
|
Assignee: |
Anchor Lamina America, Inc.
Farmington Hills
MI
|
Family ID: |
35694698 |
Appl. No.: |
10/899601 |
Filed: |
July 27, 2004 |
Current U.S.
Class: |
72/452.9 |
Current CPC
Class: |
Y10T 83/8853 20150401;
B21D 37/08 20130101; B21D 28/32 20130101; Y10T 83/8831
20150401 |
Class at
Publication: |
072/452.9 |
International
Class: |
B21J 9/18 20060101
B21J009/18 |
Claims
1. A narrow aerial or die-mount cam for use in confined spaces,
comprising: a driver, a slide and a cam adapter arranged in
vertically stacked relation; slidably arranged bearing surfaces
disposed between the driver, slide, and cam adapter supporting the
same for relative sliding movement upon closing and opening of
platens of a press between which the cam may be arranged; and each
of the slidably arranged bearing surfaces cooperatively extending
continuously across the entire distance between opposite sides of
the driver, slide and cam adapter, whereby the loading thereon is
distributed at least across the entire width of the cam.
2. The invention defined by claim 1, wherein at least a portion of
the bearing surfaces spacedly overlap, the bearing surface
extending between opposite sides of the cam thereby cumulatively
exceeding the distance between the opposite sides.
3. The invention defined by claim 2, wherein the driver has a
driver bearing surface.
4. The invention defined by claim 3, wherein the slide comprises a
primary portion and a secondary portion, the primary portion having
a T-shaped cross-section and an elongate primary bearing surface,
the secondary portion having a secondary bearing surface in
slidable contact with the driver bearing surface, the slide further
having a pair of parallel and laterally spaced intermediate bearing
surfaces located intermediate the primary bearing surface and the
secondary bearing surface.
5. The invention defined by claim 4, wherein the driver bearing
surface is softer than the secondary bearing surface and is formed
of self-lubricating material.
6. The invention defined by claim 4, wherein the cam adapter has a
rectangular recess having a rectangular recess bearing surface in
slidable contact with the primary bearing surface of the slide.
7. The invention defined by claim 6, wherein the recess bearing
surface is softer than the elongate primary bearing surface of the
elongate primary portion of the slide and is formed of
self-lubricating material.
8. The invention defined by claim 6, further including a pair of
elongate keeper plates, each having a longitudinal slot and each
being secured to one side of the cam adapter adjacent the
rectangular recess to slidably retain the primary portion of the
slide within the longitudinal slots and the rectangular recess, the
elongate keeper plates having bearing surfaces that slidably
contact the primary portion, including the primary bearing surface,
of the slide and further having bearing surfaces that slidably
contact the intermediate bearing surfaces of the slide.
9. The invention defined by claim 8, wherein surfaces of the first
and second elongate keeper plates that contact surfaces, including
the primary bearing surface, of the primary portion and that
contact the intermediate bearing surfaces of the slide are softer
than the primary portion and the intermediate bearing surfaces of
the slide and are formed of self-lubricating material.
10. The invention defined by claim 8, wherein the rectangular
recess of the cam adapter has a forward stop and a rear stop
between which the primary portion of the slide is driven, and the
slide further comprises a resilient member extending toward the
forward stop, the resilient member being compressed against the
forward stop as the primary portion of the slide is advanced, the
resilient member providing a slide-retracting force when the
resilient member is allowed to decompress.
11. The invention defined by claim 10, wherein the resilient member
is a gas spring.
12. The invention defined by claim 10, the slide further comprising
a shock absorber extending toward the rear stop of the rectangular
recess to decelerate the slide as the slide nears a fully retracted
position.
13. The invention defined by claim 10, wherein the driver has an
elongate slot that extends along a portion of each side at the same
angle to the horizontal as those of the driver bearing surface and
the secondary bearing surface of the slide.
14. The invention defined by claim 13, further comprising a
positive return member secured to each side of the slide, each
positive return member having a projection, each elongate slot
slidably receiving one of the projections.
15. The invention defined by claim 14, wherein the driver bearing
surface and the secondary bearing surface of the slide of the
aerial cam each has an inverted V-shape that slidably conforms to
the other.
16. The invention defined by claim 15, wherein the inverted
V-shaped bearing surface of the driver is formed of
self-lubricating material.
17. The invention defined by claim 16, wherein the inverted
V-shaped bearing surface of the driver is provided by a separate
inverted V-block secured to the driver.
18. The invention defined by claim 14, wherein the driver bearing
surface and the secondary bearing surface of the slide of the
die-mount cam each has a V-shape that slidably conforms to the
other.
19. The invention defined by claim 18, wherein the V-shaped bearing
surface of the driver is formed of self-lubricating material.
20. The invention defined by claim 19, wherein the V-shaped bearing
surface of the driver is provided by a separate V-block secured to
the driver.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The invention relates generally to aerial and die-mount cams
and more particularly to improvements in cams configured to provide
an increased load-bearing capacity and to facilitate the
fabrication of long-lived, narrow cams having components that do
not require custom fitting.
[0003] 2. Background Art
[0004] Aerial and die-mount cams are often used to operate tools
for such manufacturing processes as punching, trimming, stamping
and bending workpieces. These devices include elements that convert
downward and upward forces provided by a press into laterally
directed component forces that advance and retract a tool in
lateral directions to effect the mentioned processes.
[0005] Since some manufacturing processes require the application
of considerable forces, an important feature of cams is their
load-bearing capacity. Cams in present use typically have a maximum
load-bearing capacity of some 1.5 tons. Previous attempts to
increase load-bearing capacity have included broadening bearing
surfaces, but these have increased the width of the cams. Since cam
size is a limiting factor that prohibits the use of certain cams in
certain presses and for certain applications, it is thus another
important feature in cam design and application.
[0006] A few of the attempts to increase load-bearing capacity of
cams have included the introduction of laterally inclined bearing
surfaces. These changes provided an advantage of increasing the
stability of the cams as well as somewhat increasing their
load-bearing capacities, but they were not directed toward reducing
the lateral sizes of cams.
[0007] The wearing of parts that are in slidable contact with other
parts is always a concern in mechanisms such as aerial and
die-mount cams. Having to remove cams from their presses to replace
worn parts can be a costly and time-consuming activity.
[0008] The structural integrity of joined parts is another
important area of concern. Fasteners such as bolts that hold parts
together are more likely to loosen or fail if they are placed under
stress during press operation.
[0009] Many aerial and die-mount cams have configurations that are
unique to their use in specific presses and for specific purposes.
Their design and construction result in additional expenses.
SUMMARY OF THE INVENTION
[0010] An object of the present invention is to provide improved
aerial and die-mount cams that have a more efficient load
distribution. The improved load distribution enables the cams to be
narrower and to bear an increased load.
[0011] In carrying out the foregoing object, the aerial and
die-mount cams each include a driver, a slide and a cam adapter
arranged in vertically stacked relation. The cams have slidably
arranged bearing surfaces between the driver, slide and cam adapter
supporting the same for relative sliding movement upon closing and
opening of platens of a press between which the cam may be
arranged.
[0012] Each of the slidably arranged bearing surfaces cooperatively
extend continuously across the distance between opposite sides of
the driver, slide and cam adapter. The loading on the cam is
therefore distributed across the entire width of the cam.
[0013] At least a portion of the bearing surfaces spacedly overlap
each other, and the bearing surfaces extending between opposite
sides of the cam thereby cumulatively exceed the distance between
the opposite sides. This facilitates the fabrication of cams that
not only have greater load-bearing capacities but also cams that
are narrower and whose slides have increased angular stability.
[0014] The driver has a driver bearing surface, and the slide has a
primary portion and a secondary portion. The primary portion has a
T-shaped cross-section and an elongate primary bearing surface, and
the secondary portion has a secondary bearing surface in slidable
contact with the driver bearing surface. The slide further has a
pair of parallel and laterally spaced intermediate bearing surfaces
located intermediate the primary bearing surface and the secondary
bearing surface. The driver bearing surface is softer than the
secondary bearing surface and is formed of self-lubricating
material.
[0015] The cam adapter has a rectangular recess having a
rectangular recess bearing surface in slidable contact with the
primary bearing surface of the slide. The recess bearing surface is
softer than the elongate primary bearing surface of the elongate
primary portion of the slide and is formed of self-lubricating
material.
[0016] Each of a pair of elongate keeper plates, each having a
longitudinal slot, are secured to one side of the cam adapter
adjacent the rectangular recess to slidably retain the primary
portion of the slide within the longitudinal slots and the
rectangular recess. The elongate keeper plates have bearing
surfaces that slidably contact the primary portion, including the
primary bearing surface, of the slide and further have bearing
surfaces that slidably contact the intermediate bearing surfaces of
the slide. Surfaces of the first and second elongate keeper plates
that contact surfaces, including the primary bearing surface, of
the primary portion and that contact the intermediate bearing
surfaces of the slide are softer than the primary portion and the
intermediate bearing surfaces of the slide and are formed of
self-lubricating material.
[0017] The keeper plates are attached to the cam adapter with
fasteners such as bolts, and the assembled configuration reduces
the likelihood of the bolts being loosened or damaged by minimizing
the strength of forces applied to them during cam operation. The
configuration of the keeper plates and the disposition of the bolts
facilitates the removal and installation of the keeper plates
without requiring cam removal from the press.
[0018] The rectangular recess of the cam adapter has a forward stop
and a rear stop between which the primary portion of the slide is
driven, and the slide also has a resilient member extending toward
the forward stop. The resilient member is compressed against the
forward stop as the primary portion of the slide is advanced, and
the resilient member provides a slide-retracting force when the
resilient member is allowed to decompress. The slide also has a
shock absorber extending toward the rear stop of the rectangular
recess to decelerate the slide as the slide nears a fully retracted
position.
[0019] The driver has an elongate slot that extends along a portion
of each side at the same angle to the horizontal as those of the
driver bearing surface and the secondary bearing surface of the
slide. A positive return member is secured to each side of the
slide, and each positive return member has a projection that is
slidably received by one of the elongate slots.
[0020] The driver bearing surface and the secondary bearing surface
of the slide of the aerial cam each has an inverted V-shape that
slidably conforms to the other. The driver bearing surface and the
secondary bearing surface of the slide of the die-mount cam each
has a V-shape that slidably conforms to the other.
[0021] The aerial and die-mount cams are basically inverted
versions of each other. Efficiencies of assembly and installation
and reduced expenses can be realized by using cam adapters, slides
and drivers that have components that do not require custom
fitting. The self-lubricating material on one of each pair of
bearing and contacting surfaces extend the life of contacting
surfaces that slide relative to one another.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] FIG. 1 is a perspective view, partially broken away, of an
aerial cam and illustrates a combination of a cam adapter, a slide,
keeper plates, a V-block and a driver, the driver being
inclined;
[0023] FIG. 2 is a side view, showing the opposite side, of the
aerial cam of FIG. 1;
[0024] FIG. 3 is a partial cross-sectional view, taken on the line
3-3, of the aerial cam of FIG. 2.
[0025] FIG. 4 is an exploded, perspective view, showing a gas
spring and interior details, of the aerial cam of FIG. 2, the cam
shown having an uninclined driver; and
[0026] FIG. 5 is a perspective view, partially broken away, of a
die-mount cam and illustrates an inverted and similar version,
taken from a different perspective and including a tool holder and
a representative tool, of the aerial cam of FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)
[0027] It should be noted that, when the term "cam" is used in this
specification without particular reference to the type of cam, the
term refers inclusively to aerial cams and die-mount cams. It
should be further noted that FIGS. 1, 2, 3 and 5 do not show inner
details of the cams. FIG. 4, however, is an exploded view that does
reveal details of the inner structures. FIGS. 4 and 5 show only one
side of each cam represented, but the respective opposite sides and
the components and features located there are mirror images of the
components and features located on the sides shown.
[0028] FIG. 1 is a perspective view of a front and first side of a
representative narrow aerial cam, generally indicated by the
reference numeral 10, that includes a cam driving member, or cam
adapter, 12, a tool holding member, or slide, 14, and a driver 16.
The cam adapter 12 is secured, typically by bolts 13 (FIG. 2)
passing through bolt holes 18, to an upper platen 21 (FIG. 2) of a
press (not shown). To facilitate properly aligning the cam adapter
12, the latter has a key 20 that is secured within a keyway 22 by a
fastener such as a bolt 24 (FIG. 4). The key 20 is received within
a mating keyway within the upper platen 21 (FIG. 2). The driver 16
is secured, by fasteners such as bolts 13 (FIG. 2) passing through
bolt holes 18, to a lower platen 23 (FIG. 2) of the press (not
shown). Efficiencies of assembly and installation and reduced
expenses can be realized by using cam adapters 12, slides 14 and
drivers 16 that have components that do not require custom
fitting.
[0029] Also shown by FIG. 1 are first sides, 26, 36 and 40 of the
cam adapter 12, the slide 14 and the driver 16 respectively. A
first elongate keeper plate 30 is attached to the first side 26 of
the cam adapter 12 by fasteners such as bolts 34. A V-block 44,
having an inverted-V-shaped driver bearing surface, generally
indicated by the reference numeral 46' (FIG. 4), is secured atop
the driver 16 by fasteners such as bolts 48' (FIG. 4), and slidably
supports the slide 14. The slide 14 has a front end 84 and a rear
end 86. A representative tool 2 is shown mounted on the front end
84 of the slide 14 with a representative tool holder 4. The slide
14 has an inverted V-shaped secondary bearing surface, generally
indicated by the reference numeral 19' (FIG. 4) that conforms to
the driver bearing surface 46' of the V-block 44'. The driver
bearing surface 46' (FIG. 4) of the driver 16 upon which the slide
14 is slidably supported is inclined at an acute angle to the
horizontal, and the driver 16 has a first elongate slot 50 that
extends at the same acute angle to the horizontal. A first positive
return member 54 (shown partially broken away) is secured within a
first recess 58 to the first side 36 of the slide 14 by a fastener
such as a bolt 62. At an end distal from the bolt 62 securing the
first positive return member 54 to the slide 14, the first positive
return member 54 has a generally rectangular first projection 64
(see FIG. 3 and the second projection 66', FIG. 4) that slidably
extends into the first elongate slot 50.
[0030] FIG. 2 is a view of a second, opposite side of the narrow
aerial cam 10 of FIG. 1. The components and features located on the
second side of the narrow aerial cam 10 are mirror images of those
of the first side, and their functions are the same as previously
described for their respective counterparts on the first side.
Shown are second sides, 28, 38 and 42 of the cam adapter 12, the
slide 14 and the driver 16 respectively. A second elongate keeper
plate 32 is attached to the second side 28 of the cam adapter 12.
The driver 16 has a second elongate slot 52, which is inclined at
the same acute angle to the horizontal as that of the first
elongate slot 50 of FIG. 1. A second positive return member 56 is
secured to the second side 38 of the slide 14.
[0031] FIG. 3 is a rear view of the narrow aerial cam 10 of FIG. 2,
shown partially in cross-section, taken on the line 3-3 of FIG. 2.
It shows the cam adapter 12 and the first and second elongate
keeper plates 30 and 32, in section, attached to the cam adapter 12
and also indicates respective first and second longitudinal slots
68 and 70 in the elongate keeper plates 30 and 32. Also shown is a
rear-end view of the slide 14 and first and second positive return
members, 54 and 56 respectively, and respective first and second
projections 64 and 66 extending respectively from the first and
second positive return members 54 and 56. Bolts 34 securing the
first and second elongate keeper plates 30 and 32 to the cam
adapter 12 are also represented. The assembled configuration
reduces the likelihood of the bolts 34 being loosened or damaged by
minimizing the strength of forces applied to them during cam
operation. The configuration of the elongate keeper plates 30 and
32 and the disposition of the bolts 34 facilitates the removal and
installation of the elongate keeper plates 30 and 32 without having
to remove the cam 10 from the press (not shown).
[0032] Except for having a driver 16' with an uninclined driver
bearing surface 46' rather than an inclined driver bearing surface
as with the driver 16 (FIG. 2) and having a slide 14' with an
uninclined secondary bearing surface 19' rather than an inclined
secondary bearing surface as with the slide 14 (FIG. 2), a narrow
aerial cam 10' shown by FIG. 4 would be similar to an exploded,
perspective view of the narrow aerial cam 10 of FIG. 2. As
mentioned previously, FIG. 4 shows only one side of the aerial cam
represented, but the opposite side and the components and features
located there are a mirror image of the second side and the
components and features located there. Shown by FIG. 4 are second
sides, 28', 38' and 42' of the cam adapter 12', the slide 14' and
the driver 16' respectively. A first elongate keeper plate 30' is
attached to the first side (not shown) of the cam adapter 12', and
a second elongate keeper plate 32' is attached to the second side
28' of the cam adapter 12' by fasteners such as bolts 34'.
[0033] A V-block 44', having an inverted-V-shaped driver bearing
surface, generally indicated by the reference numeral 46', is
secured atop the driver 16' by fasteners such as bolts 48', and
slidably supports the slide 14'. The driver bearing surface 46' of
the V-block 44' upon which the slide 14' is slidably supported is
softer than the secondary bearing surface 19' of the slide 14' and
is preferably formed of self-lubricating material. The driver
bearing surface 46' is uninclined to the horizontal, and the driver
16' has a second elongate slot 52' that is also uninclined to the
horizontal. A second positive return member 56' is secured within a
second recess 60' to the second side 38' of the slide 14' by a
fastener such as a bolt 62'. At an end distal from the bolt 62'
securing the second positive return member 56' to the slide 14',
the second positive return member 56' has a generally rectangular
second projection 66' that slidably extends into the second
elongate slot 52'.
[0034] As revealed by the exploded view of FIG. 4, the slide 14'
includes an elongate primary portion, generally indicated by the
reference numeral 72', having a generally T-shaped cross section
that delineates first and second longitudinal slots, 74' and 76'
respectively. The slide also includes a secondary portion,
generally indicated by the reference numeral 73', which includes
the secondary bearing surface 19' in slidable contact with the
driver bearing surface 46' of the V-block. The slide 14' has a
front end 84' and a rear end 86'. Extending from the front end 84'
of the elongate primary portion 72' of the driver 14' is a
resilient member, preferably a gas spring, 88'; and extending from
the rear end 86' is a shock absorber 90'. The cam adapter 12' has a
rectangular recess, generally indicated by the reference numeral
92', that slidably receives the elongate primary portion 72' of the
slide 14'. One end of the rectangular recess 92' acts as a forward
stop 94' against which the gas spring 88' is compressed when the
slide 14 is advanced. The opposite end of the rectangular recess
92' acts as a rear stop 96' against which the shock absorber 90' is
compressed when the slide 14 is retracted.
[0035] The mutually inwardly facing inner bearing surfaces of the
first and second elongate keeper plates, 30' and 32' respectively,
have first and second longitudinal slots 68' and 70' that slidably
receive the generally rectangular elongate primary portion 72' of
the slide 14'. The configuration of the primary portion 72' and of
the intermediate bearing surfaces 78' and 80' of the slide and
their cooperation with the rectangular recess bearing surface of
the cam adapter 12' and with the bearing surfaces of the elongate
keeper plates 30' and 32' contribute to the increased load-bearing
capacity of the cam and to an increased lateral and angular
stability of the slide 14' of the cam. The slide 14' has three
bearing surfaces that receive downward forces from the cam adapter
12' and the elongate keeper plates 30' and 32' when the cam adapter
12' is forced downwardly by the upper platen 21 of the press (not
shown). The top of the elongate primary portion 72' forms an
elongate primary bearing surface 82'; and lower bearing surfaces of
the first and second elongate slots 74' and 76' extend laterally to
form first and second central bearing surfaces, 78' and 80'
respectively.
[0036] The elongate primary bearing surface 82' receives downward
forces directly from the cam adapter 12' and indirectly from upper
edges of the first and second longitudinal slots 68' and 70' of the
first and second elongate keeper plates 30' and 32'. The first and
second central bearing surfaces 78' and 80' receive forces
respectively from the first and second lower bearing surfaces 98'
and 100' of the first and second elongate keeper plates 30' and
32'. The rectangular recess bearing surface 93' (shown by the
broken away portion) of the rectangular recess 92' is softer than
the elongate primary bearing surface 82' of the elongate primary
portion 72' of the slide 14' and is preferably formed of
self-lubricating material.
[0037] As represented by portions shown by FIG. 4 of the first
elongate keeper plate 30', portions of the inner bearing surfaces,
including the bearing surfaces of the first and second longitudinal
slots 68' and 70', of the first and second elongate keeper plates
30' and 32' are formed of material that is softer than the bearing
surfaces of the upper portion 72' of the slide 14' and are
preferably formed of self-lubricating material. First and second
lower bearing surfaces 98' and 100' of the first and second
elongate keeper plates, 30' and 32' respectively (similar to the
first and second upper bearing surfaces 272 and 274 shown by FIG.
5), have softer bearing surfaces than the respective first and
second intermediate bearing surfaces 78' and 80' of the slide 14'
and are preferably formed of self-lubricating material.
[0038] The bearing surfaces cooperatively extend continuously
across the distance between opposite sides of the driver, slide and
cam adapter, distributing loads across the entire width of the cam.
Moreover, as shown best by FIG. 4, in the aerial cam shown, a
portion of the elongate primary bearing surface 82' spacedly
overlaps a portion of each of the first and second intermediate
bearing surfaces 78' and 80', and it also spacedly overlaps a
portion of the driver bearing surface 46 of the V-block 44'. The
first and second intermediate bearing surfaces 78' also spacedly
overlap portions of the driver bearing surface 46 of the V-block
44'. In the die-mount cam shown by FIG. 5, the secondary bearing
surface 219 of the slide 214 spacedly overlaps portions of the
first and second upper bearing surfaces 272 and 274 of the first
and second elongate keeper plates, 230 and 232 respectively, and
spacedly overlaps the bearing surface (not shown but similar to an
inverted rectangular recess bearing surface 93' of the rectangular
recess shown by FIG. 4).
[0039] The portions of bearing surfaces overlapped represent
bearing surfaces in excess of those necessary to cooperatively
extend continuously across the distance between opposite sides of
the driver, slide and cam adapter; and they do so without adding to
the overall width of the cam. These features facilitate the
fabrication of cams that are narrower and whose slides have
increased angular stability. The configuration provides the cams of
the present invention with a load-bearing capacity of some 4
tons.
[0040] The narrow aerial cam 10' shown by FIG. 4 will now be used
as a representative example of the aerial cams shown by FIGS. 1, 2,
3 and 4 in describing their operation. When the cam adapter 12' is
pressed downwardly by the upper platen 31 (FIG. 2) of the press
(not shown), an attending downward force is exerted by an inclined
rectangular recess bearing surface 93' of the rectangular recess
92' upon the inclined elongate primary bearing surface 82' of the
slide 14'. The first and second elongate keeper plates 30' and 32'
secured to the cam adapter 12' also communicate the attending force
to the likewise inclined intermediate bearing surfaces 78' and 80'
of the slide 14'. A component of the downward force exerted upon
the inclined elongate primary bearing surface 82' and the inclined
intermediate bearing surfaces 78' and 80' advances the slide 14'
along the driver bearing surface 46' of the V-block 44'. Due to the
relative motions of the cam adapter 12' and the slide 14', as the
cam adapter 12' is forced downwardly by the upper platen 21 of the
press (not shown), the gas spring 88' is compressed against the
forward stop 94' within the rectangular recess 92' of the cam
adapter 12'.
[0041] At an end distal from the bolt 62' securing the second
positive return member 56' to the slide 14', the second positive
return member 56' has a generally rectangular second projection 66'
that slidably extends into the second elongate slot 52' of the
driver 16'. A first generally rectangular projection (not shown but
a mirror image of the second projection 66') slidably extends from
a first positive return member 54' into a first elongate slot (not
shown but a mirror image of the second elongate slot 52') in the
driver 16'.
[0042] When the slide 14' is to be retracted, the cam adapter 12'
shown by FIG. 4 is forced upwardly by the platen 21 of the press
(not shown). The generally rectangular elongate primary portion 72'
of the slide 14', which is slidably contained within the
rectangular recess 92' of the cam adapter 12' and the first and
second longitudinal slots 68' and 70' of the first and second
elongate keeper plates 30' and 32', is pulled upwardly. The
inclined disposition of the bearing surfaces supporting the
elongate primary portion 72' of the slide 14' within the
rectangular recess 92' results in a component of the vertical force
that is pulling the cam adapter 12' upwardly being directed
laterally to retract the slide 14'. The component force acting to
retract the slide 14' is supplemented by a force provided by the
gas spring 88' as it decompresses.
[0043] Likewise, with reference to FIGS. 1 and 2, when the cam
adapter 12 is forced upwardly by the upper platen 21 of the press
(not shown), the slide 14 is retracted by component forces applied
to the slide 14 by the first and second elongate keeper plates 30
and 32 and by the decompressing gas spring 88' (FIG. 4). An
upwardly directed component of the force applied to the slide 14 by
the first and second elongate keeper plates 30 and 32 is also
communicated to the first and second positive return members 54 and
56, which are secured to the slide 14. When the projections (see
second projection 66' of FIG. 4) extending from the first and
second positive return members 54 and 56 are forced upwardly within
the first and second, stationary, inclined, elongate slots 50 and
52 respectively, the positive return members 54 and 56 force the
slide 14 to retract even if the forces applied to the slide 14 by
the first and second elongate keeper plates 30 and 32 and by the
decompressing gas spring 88' (FIG. 4) fail to do so. The first and
second positive return members 54 and 56 also limit the separation
of the slide 14 from the driver 16.
[0044] FIG. 5 is a perspective view of a narrow die-mount cam,
generally indicated by the reference numeral 210. It is essentially
an inverted version the narrow aerial cam 10 shown by FIG. 1, shown
from a different perspective. As mentioned previously, FIG. 5 shows
only one side of the cam represented, but the opposite side and the
components and features located there are a mirror image of the
respective components and features located on the side shown. The
narrow die-mount cam 210 includes a cam driving member, or cam
adapter, 212, a tool holding member, or slide, 214, and a driver
216. The cam adapter 212 is secured, typically by bolts 13 (FIG. 2)
passing through bolt holes 218, to the lower platen 23 (FIG. 2) of
the press (not shown). The driver 216 is secured, by fasteners such
as bolts 13 (FIG. 2) passing through bolt holes 218, to the upper
platen 21 (FIG. 2) of the press (not shown).
[0045] Also shown by FIG. 5 are second sides 228, 238 and 242 of
the cam adapter 212, the slide 214 and the driver 216 respectively.
A first elongate keeper plate 230 is attached to a first side (not
shown but a mirror image of the second side 228) of the cam adapter
212; and a second elongate keeper plate 232 is attached to the
second side 228 of the cam adapter 212 by fasteners such as bolts
234. A V-block 244, having a V-shaped driver bearing surface (see
driver bearing surface 46', FIG. 4), is secured below the driver
216, and is slidably supported by the slide 214. The slide 214 has
a V-shaped secondary bearing surface, generally indicated by the
reference numeral 219, that conforms to the driver bearing surface
of the V-block 244. The driver bearing surface of the driver 216
that is slidably supported by the slide 214 is inclined at an acute
angle to the horizontal, and the driver 216 has a second elongate
slot 252 that extends at the same acute angle to the horizontal. A
second positive return member 256 is secured within a second recess
260 to the second side 238 of the slide 214 by a fastener such as a
bolt 262. At an end distal from the bolt 262 securing the second
positive return member 256 to the slide 214, the second positive
return member 256 has a generally rectangular first projection (see
second projection 66', FIG. 4) that slidably extends into the
second elongate slot 252.
[0046] The slide 214 is configured to support a tool holder 204
that is capable of holding any of a number of well-known tools such
as a representative punch 202 shown. The cam adapter 212, being on
the bottom, slidably supports the slide 214, which in turn slidably
supports the driver 216. The components and features of the
opposite side of the narrow die-mount cam 210 shown by FIG. 5 are
mirror images of those of the side shown.
[0047] As described for elements of the cams shown by previous
figures, similar respective bearing surfaces that are not exposed
by FIG. 5 are harder or softer relative to another upon which it
slides. As described previously, the softer bearing surfaces, for
example, first and second upper bearing surfaces, 272 and 274
respectively, of the first and second elongate keeper plates 230
and 234 are preferably formed of self-lubricating material.
[0048] The operation of the die-mount cam 210 is similar to that of
the aerial cam 10. As the driver 216 is forced downwardly by the
upper platen 21 of the press (not shown) and the slide 214 advances
along the cam adapter 232, the tool 202 (FIG. 5) secured to the
slide 214 by a tool holder 204 (FIG. 5) is advanced toward a
workpiece (not shown). When the driver 216 is forced upwardly by
the platen 21 of the press (not shown), the slide 214 and tool 202
are retracted. The advancement and retraction of the slide 214 are
accomplished as described for slides shown by the previous
figures.
[0049] While embodiments of the invention have been illustrated and
described, it is not intended that these embodiments illustrate and
describe all possible forms of the invention. Rather, the words
used in the specification are words of description rather than
limitation, and it is understood that various changes may be made
without departing from the spirit and scope of the invention.
* * * * *