U.S. patent application number 10/013171 was filed with the patent office on 2003-11-06 for wood lathe with a tracing unit.
Invention is credited to Liao, Juei-Seng.
Application Number | 20030205290 10/013171 |
Document ID | / |
Family ID | 27786993 |
Filed Date | 2003-11-06 |
United States Patent
Application |
20030205290 |
Kind Code |
A1 |
Liao, Juei-Seng |
November 6, 2003 |
WOOD LATHE WITH A TRACING UNIT
Abstract
A wood lathe includes an axial moving unit with a movable seat,
which is sleeved movably on a driving rod and a guide rod that are
parallel to each other. A driving gear is disposed rotatably on the
movable seat, and engages a gear-engaging member of the driving
rod. When an actuator member is rotated, the gear rotates
synchronously therewith so as to move the movable seat on the
driving rod. A sample bar and a bar blank are held on a bed of the
lathe. A blade is carried on the movable seat for cutting the bar
blank. A tracing unit is disposed on the movable seat so that a
groove pattern on the sample bar is traced mechanically and is
duplicated on the bar blank.
Inventors: |
Liao, Juei-Seng; (Taichung
City, TW) |
Correspondence
Address: |
WEBB ZIESENHEIM LOGSDON ORKIN & HANSON P.C.
700 Koppers Building
436 Seventh Avenue
Pittsburgh
PA
15219-1818
US
|
Family ID: |
27786993 |
Appl. No.: |
10/013171 |
Filed: |
December 7, 2001 |
Current U.S.
Class: |
142/38 |
Current CPC
Class: |
B27C 7/06 20130101; Y10T
82/141 20150115; B23Q 35/102 20130101; Y10T 82/2531 20150115; Y10T
82/2541 20150115; B23Q 35/26 20130101 |
Class at
Publication: |
142/38 |
International
Class: |
B23Q 035/08; B23Q
035/26 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 15, 2001 |
TW |
090217523 |
Claims
I claim:
1. A wood lathe for cutting a cylindrical bar blank to form a
groove pattern on the bar blank, the groove pattern being the same
as that of a sample bar, said wood lathe comprising: an elongated
lathe bed having a top surface with a longitudinally extending
track unit that has a first end and a second end; a blank-holding
unit including a headstock disposed fixedly on said first end of
said track unit, a first clamping element disposed rotatably on
said headstock, an output shaft journalled within said headstock
and connected fixedly to said first clamping element so as to
rotate said first clamping element, a tailstock disposed movably on
said second end of said track unit, and a second clamping element
disposed rotatably on said tailstock and adapted to clamp and fix
the bar blank between said first and second clamping elements such
that the bar blank extends in a longitudinal direction of said
lathe bed, thereby permitting rotation of the bar blank when said
output shaft is rotated; a sample-holding unit disposed in front of
said blank-holding unit and including a pair of first and second
bases that are disposed movably on and that are locked releaseably
on said track unit so as to be adapted to clamp and fix the sample
bar therebetween; an axial moving unit including a driving rod
disposed fixedly between said headstock and said tailstock and
adapted to extend in an axial direction of the bar blank, said
driving rod being provided with a fixed gear-engaging member, a
guide rod disposed fixedly between said headstock and said
tailstock and extending parallel to said driving rod, a movable
seat sleeved movably on said driving rod and said guide rod, a
driving gear disposed rotatably on said movable seat and engaging
said gear-engaging member of said driving rod in such a manner to
permit movement of said movable seat along said driving rod and
said guide rod when said gear rotates on said movable seat, and an
actuator member disposed rotatably on and projecting outwardly from
said movable seat, said actuator member being connected fixedly to
said driving gear so as to rotate synchronously therewith; a radial
moving unit including a carrier that is mounted movably on said
movable seat so as to be movable relative to said movable seat in a
radial direction of the bar blank; a tracing unit including a
vertical follower post disposed movably on said carrier and adapted
to press against the sample bar in such a manner to permit sliding
movement of said follower post on the sample bar when said movable
seat moves relative to the sample bar, and a lock member for
locking said follower post releaseably on said carrier, said lock
member being operable to unlock said follower post from said
carrier so as to permit movement of said follower post on said
carrier in the radial direction of the bar blank; a spring adapted
to bias said follower post to press against the sample bar; and a
blade unit including a blade that is disposed movably on and that
is locked releaseably on said carrier so as to move with said
carrier in a feeding direction for cutting the bar blank, said
blade being capable of being unlocked from said carrier so as to
move relative to said carrier along the radial direction of the bar
blank; whereby, said carrier and said movable seat can be moved
along said track unit so that said follower post slides on the
sample bar such that the groove pattern on the sample bar is traced
mechanically and is duplicated on the bar blank.
2. The wood lathe as claimed in claim 1, wherein said driving rod
of said axial moving unit is horizontal, and is formed with a
horizontal row of teeth along a longitudinal direction of said
driving rod, said teeth constituting said gear-engaging member and
serving as a rack, said gear being constructed as a pinion and
being rotatable about a vertical axis.
3. The wood lathe as claimed in claim 2, wherein said actuator
member has a lower end that is connected fixedly to said gear, and
an upper end that is formed integrally with a plurality of
angularly equidistant, radially and outwardly extending rotary
levers.
4. The wood lathe as claimed in claim 1, wherein said movable seat
includes a vertical front side wall, and a pair of parallel first
and second side walls that extend respectively, integrally and
rearwardly from two opposite sides of said front side wall and that
are spaced apart from each other along the axial direction of the
bar blank, each of said first and second side walls having an inner
surface and a bottom surface, said carrier having two opposite
sides which are provided respectively with two rotatable wheels,
each of which has a large-diameter inner wheel portion that abuts
against said inner surface of a respective one of said first and
second side walls of said movable seat, and a small-diameter outer
wheel portion that has a diameter smaller than that of said inner
wheel portion and that abuts against said bottom surface of the
respective one of said first and second side walls of said movable
seat, whereby, said carrier is guided to move in the radial
direction of the bar blank.
5. The wood lathe as claimed in claim 1, wherein said carrier has a
bottom surface, which is formed with a dovetail groove that has a
T-shaped cross-section, said follower post having an externally
threaded upper end, said tracing unit further including: an
internally threaded cap confined within said dovetail groove in
said carrier and engaging threadably said externally threaded upper
end of said follower post, thereby fixing said follower post to
said cap; a washer sleeved on said follower post and abutting
against said bottom surface of said carrier; and a lock nut
engaging said upper end of said follower post so as to press said
washer against said bottom surface of said carrier, thereby fixing
said follower post to said carrier, said lock nut constituting said
lock member.
6. The wood lathe as claimed in claim 1, wherein said blade unit
further includes a blade-mounting rod that is disposed movably on
said carrier and that is connected fixedly to said blade, said
carrier having an upper end, which is shaped as a C-shaped clamp
that clamps said blade-mounting rod therein, said clamp including
two clamp ends that are formed respectively with two threaded
holes, and a lock bolt that engages said threaded holes in said
clamp ends so as to lock said blade-mounting rod within said clamp,
whereby, when said lock bolt is loosened, said blade-mounting rod
can move on said carrier.
7. The wood lathe as claimed in claim 6, wherein said movable seat
has a vertical front side wall that is formed with a blade hole and
a rail hole, said wood lathe further including: a vertical plate
bolted to said blade-mounting rod and having a rear side surface
and a bottom surface; an operating lever having a pivot end that is
mounted rotatably to said movable seat, an intermediate portion
that is shaped as a horizontal strip and that is formed with a
longitudinal slide slot, and a grip end; a vertical engaging bolt
fixed to said bottom surface of said vertical plate and extending
through said slide slot in said operating lever so as to convert
rotation of said operating lever into movement of said vertical
plate; and a guide rail connected fixedly to and extending rearward
from said rear side surface of said vertical plate and through said
rail hole in said front side wall of said movable seat, said guide
rail engaging fittingly and slidably said rail hole and adapted to
extend in the radial direction of the bar blank so as to guide said
blade to move in the radial direction of the bar blank.
8. The wood lathe as claimed in claim 7, wherein said spring is a
coiled tension spring that interconnects said movable seat and said
vertical plate so as to pull said vertical plate toward said front
side wall of said movable seat.
9. The wood lathe as claimed in claim 8, further comprising a
cutting depth-fixing unit, which includes: a vertical pivot bolt; a
horizontal adjusting disk disposed rotatably on and locked
releaseably on said vertical plate by means of said pivot bolt and
having a curved outer peripheral portion which is formed with a
series of positioning notches that are spaced apart from said pivot
bolt at different distances; and a positioning bolt fixed on an
upper end of said front side wall of said movable seat and engaging
a selected one of said positioning notches so that said vertical
plate is spaced apart from said front side wall of said movable
seat at a predetermined distance; whereby, when said pivot bolt is
loosened, said adjusting disk can be rotated so that said
positioning bolt disengages from the selected one of said
positioning notches and engages another one of said positioning
notches, thereby varying distance between said vertical plate and
said front side wall of said movable seat so as to adjust position
of said blade relative to said carrier along the radial direction
of the bar blank.
10. The wood lathe as claimed in claim 8, wherein said vertical
plate has a threaded hole, said wood lathe further including a
horizontal cutting depth-adjusting bolt which engages said threaded
hole in said vertical plate and which has a rear end that is biased
by said spring to abut against said front side wall of said movable
seat, said cutting depth-adjusting bolt being rotatable to move
said vertical plate relative to said movable seat.
11. The wood lathe as claimed in claim 1, further comprising an
L-shaped support frame, which includes a vertical frame portion
that is connected fixedly to said movable seat, and a horizontal
frame portion that is disposed slidably along said track unit,
thereby stabilizing movement of said movable seat.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application claims priority of Taiwanese Application
No. 90217523, filed on Oct. 15, 2001.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] This invention relates to a wood lathe, and more
particularly to a wood lathe including a tracing unit, by which a
groove pattern on a sample bar is traced mechanically and is
duplicated on a bar blank.
[0004] 2. Description of the Related Art
[0005] Referring to FIGS. 1, 2 and 3, a conventional wood lathe 10
is shown to include a lathe bed 11, a blank-holding unit 12, a
sample-holding unit 13, a moving unit 14, a blade unit 15, a
tracing unit 16, and a tension spring 17. The blank-holding unit 12
consists of a headstock 121 and a tailstock 122, which are provided
with a pair of clamping elements 1211, 1221 that clamp and fix a
wood bar blank (not shown) therebetween. An output shaft (not
shown) is journalled to the headstock 121, and is connected fixedly
to the clamping element 1211 so as to rotate the bar blank (not
shown) when the output shaft rotates. The sample-holding unit 13
includes two bases 131 that are disposed slidably on and that are
locked releaseably on the lathe bed 11, two support frames 132 that
are inserted respectively into two hollow posts 1311 of the bases
131, two height-adjustable movable members 133 that are sleeved
respectively on the support frames 132, two horizontal mounting
rods 134 that are connected fixedly to the movable members 133, and
two clamping elements 135 that are connected respectively and
fixedly to the connecting rods 134 and that clamp and fix a sample
bar (not shown) therebetween.
[0006] The moving unit 14 includes a track unit 141 that is
connected fixedly to top ends of the support frames 132, and an
interior sliding block 142 that is disposed longitudinally and
movably within the track unit 141. A generally U-shaped exterior
sliding seat 143 is disposed movably on an outer surface of the
track unit 141. A bottom sliding member 144 is connected fixedly to
the interior sliding block 142 and the exterior sliding seat 143,
and is disposed movably on a bottom portion of the track unit 141.
A bottom cover 145 is disposed to close a bottom opening 1441 in
the bottom sliding member 144. A handle 146 is fixed to a
horizontal top plate portion 1431 (see FIG. 3) of the exterior
sliding seat 143.
[0007] The blade unit 15 includes a blade-mounting rod 151, and a
blade 152 that is mounted fixedly to the blade-mounting rod 151 and
that is inserted between the bottom sliding member 144 and the
bottom cover 145. The tracing unit 16 includes a vertical
connecting rod 161 that is connected fixedly to the blade-mounting
rod 151, an annular adjustment element 162 that is sleeved movably
on and that is locked releaseably on the connecting rod 161, and a
follower roller 163 that is mounted rotatably on the adjustment
element 162 and that is biased by the spring 17 to press against a
lateral side of the sample bar (not shown). When the handle 146 is
moved along the track unit 141, the follower roller 163 slides over
the lateral side of the sample bar (not shown) along a curved path
so that the blade 152 moves synchronously with the follower roller
163. Accordingly, a groove pattern on the sample bar (not shown) is
traced mechanically, and is duplicated on the bar blank (not
shown). The aforesaid conventional wood lathe 10 suffers from a
drawback in that no effective guiding and stabilizing means are
provided for the exterior sliding seat 143, thereby resulting in
vibration of the blade unit 15 when the follower roller 163 slides
on the sample bar (not shown). As such, the blade 152 cannot move
smoothly during operation.
SUMMARY OF THE INVENTION
[0008] The object of this invention is to provide a wood lathe,
which includes a tracing unit and a blade that can move smoothly
during operation.
[0009] According to this invention, a wood lathe includes an axial
moving unit with a movable seat, which is sleeved movably on a
driving rod and a guide rod that are parallel to each other. A
driving gear is disposed rotatably on the movable seat, and engages
a gear-engaging member of the driving rod. When an actuator member
is rotated, the gear rotates synchronously therewith so as to move
the movable seat on the driving rod. A sample bar and a bar blank
are held on a bed of the lathe. A blade is carried on the movable
seat for cutting the bar blank. A tracing unit is disposed on the
movable seat so that a groove pattern on the sample bar is traced
mechanically and is duplicated on the bar blank. Because the
movable seat is moved on the driving rod by rotating the actuator
member, the movements of the movable seat and the blade are
stabilized. Furthermore, the movable seat is guided effectively to
move smoothly in a direction by means of the guide rod.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] These and other features and advantages of this invention
will become apparent in the following detailed description of a
preferred embodiment of this invention, with reference to the
accompanying drawings, in which:
[0011] FIG. 1 is an assembled perspective view of a conventional
wood lathe;
[0012] FIG. 2 is an assembled fragmentary perspective view of the
conventional wood lathe;
[0013] FIG. 3 is a fragmentary exploded perspective view of the
conventional wood lathe;
[0014] FIG. 4 is a front view of the preferred embodiment of a wood
lathe according to this invention;
[0015] FIG. 5 is an assembled fragmentary perspective view of the
preferred embodiment, illustrating a front side of a movable
seat;
[0016] FIG. 6 is an assembled fragmentary perspective view of the
preferred embodiment, illustrating a rear side of the movable
seat;
[0017] FIG. 7 is a fragmentary exploded perspective view of the
preferred embodiment, in which a lathe bed, a blank-holding unit
and a sample-holding unit are removed for the sake of brevity;
[0018] FIG. 8 is a partly sectional view of an axial moving unit
and a blade-mounting rod of the preferred embodiment;
[0019] FIG. 9 is an assembled fragmentary perspective view of the
preferred embodiment, viewed from the top, illustrating how a
carrier is guided to move on the movable seat;
[0020] FIG. 10 is an assembled fragmentary perspective view of the
preferred embodiment, viewed from the bottom, illustrating how the
carrier is guided to move on the movable seat;
[0021] FIG. 11 is a fragmentary, partly sectional view of the
preferred embodiment, illustrating how a follower post is connected
to the carrier;
[0022] FIG. 12 is an assembled fragmentary perspective view of the
preferred embodiment, illustrating how the cutting depth of a bar
blank is fixed; and
[0023] FIG. 13 is a sectional view taken along Line 13-13 in FIG.
6.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0024] Referring to FIGS. 4, 5, and 6, the preferred embodiment of
a wood lathe according to this invention is shown to include a
lathe bed 20, a blank-holding unit 30, a sample-holding unit 40, an
axial moving unit 50, a radial moving unit 60, a tracing unit 70, a
blade unit 80 (see FIG. 5), a manual operating unit 90, a cutting
depth-fixing unit 100, a cutting depth-adjusting bolt 110 (see FIG.
6), and a coiled tension spring 120. A cylindrical bar blank 130
and a sample bar 140 are held on the lathe bed 20, and extend along
the length of the lathe bed 20.
[0025] The lathe bed 20 includes four legs 21 (only two are shown
in FIG. 4) that are disposed respectively at four corners thereof,
and a longitudinally extending track unit 22 that is provided on a
top surface of the lathe bed 20 and that has a first end 221 and a
second end 222.
[0026] The blank-holding unit 30 includes a headstock 31 that is
disposed fixedly on the first end 221 of the track unit 22 and that
is provided with a motor-operated output shaft 311, and a tailstock
32 that is disposed movably on the second end 222 of the track unit
22. A first clamping element 33 is connected fixedly to the output
shaft 311. A second clamping element 34 is disposed rotatably on
the tailstock 32. The bar blank 130 is clamped and is fixed between
the first and second clamping elements 33, 34 so as to rotate
synchronously with the first clamping element 33 when the output
shaft 311 rotates.
[0027] The sample-holding unit 40 includes a pair of first and
second bases 41, 42 that are disposed movably on and that are
locked releaseably on the track unit 22, and a pair of vertical
first and second support plates 43, 44 that are disposed movably on
and that are locked releaseably on the first and second bases 41,
42. Each of the first and second support plates 43, 44 has an upper
positioning hole 431, 441, a lower positioning hole 432, 442, and a
vertical slide slot 433, 443. A pair of elongated first and second
adjusting seats 45, 46 are disposed movably on and are locked
releaseably on the first and second support frames 43, 44 by two
lock bolts 49 that extend through the slide slots 433, 443,
respectively. Two clamping elements 47, 48 extend through two slide
slots 451, 461 in the adjusting seats 45, 46, and have threaded
ends that engage two nuts so as to lock the clamping elements 47,
48 on the adjusting seats 45, 46. The lock bolts 49 extend through
the slide slots 451, 461 in the adjusting seats 45, 46. The sample
bar 140 is clamped and is fixed between the clamping elements
47,48. As such, the height and the horizontal position of the
sample bar 140 can be adjusted with respect to the lathe bed
20.
[0028] Referring to FIGS. 4, 5, 6, and 7, the axial moving unit 50
includes a horizontal driving rod 51, a horizontal guide rod 52, a
movable seat 53, a driving gear 54, an actuator member 55, and a
bearing unit 56. The driving rod 51 has two ends that are fixed
respectively within the upper positioning holes 431, 441 in the
first and second support frames 43, 44, and extends in an axial
direction of the bar blank 130. The guide rod 52 has two ends that
are fixed respectively within the lower positioning holes 432, 442
in the first and second support frames 43, 44, and is disposed
below, behind, and parallel to the driving rod 51. The movable seat
53 has a vertical front side wall 531, a vertical rear side wall
532, a vertical first side wall 533, a vertical second side wall
534, an interior chamber 535, a horizontal top side wall 536, and
an inclined wall 537. The first and second side walls 533, 534
extend respectively, integrally and rearwardly from two opposite
sides of the front side wall 531. Each of the first and second side
walls 533, 534 is formed with an upper circular hole (53A, 5341)
(see FIGS. 5 and 6) and a lower circular hole (53B, 5342). The
driving rod 51 and the guide rod 52 extend respectively through the
upper and lower circular holes (53A, 53B, 5341, 5342) in the
movable seat 53. This is to say, the movable seat 53 is sleeved
slidably on the driving rod 51 and the guide rod 52, and is guided
by the guide rod 52 to move in the axial direction of the bar blank
130.
[0029] Referring to FIGS. 7 and 8, the driving gear 54 is disposed
rotatably in the interior chamber 535 between the front and rear
side walls 531, 532 and between the first and second side walls
533, 534, is configured as a pinion, and engages a gear-engaging
member 511 of the driving rod 51, which is configured as a
horizontal row of teeth that serves as a rack. Accordingly, when
the driving gear 54 rotates, the movable seat 53 moves on the
driving rod 51. The driving gear 54 has an integral rotating shaft
portion 541 that is journalled to the movable seat 53 by means of
the bearing unit 56, and is positioned relative to the movable seat
53 by means of a C-shaped retaining ring 542 that can prevent
downward movement of the driving gear 54. The actuator member 55
projects outwardly from the movable seat 53, and has a lower end
with a lower sleeve portion 551 that is sleeved on and that is
locked on the rotating shaft portion 541 of the driving gear 54 by
a lock bolt 552, thereby connecting the actuator member 55 fixedly
to the driving gear 54. An upper end of the actuator member 55 is
formed integrally with a plurality of angularly equidistant,
radially and outwardly extending rotary levers. A retaining plate
unit 561 is locked on the movable seat 53 by two lock bolts 562,
thereby confining the driving gear 54 within the movable seat 53.
Because the movable seat 53 is driven by rotating the rotary levers
of the actuator member 55, and is sleeved on the driving rod 51 and
the guide rod 52, it can move smoothly.
[0030] Referring to FIGS. 6 and 13, the axial moving unit 50
further has a supporting assembly 57, which includes an L-shaped
support frame 571 and a sliding element 572. The support frame 571
is formed with a vertical frame portion 5711 that is bolted to the
movable seat 53, and a horizontal frame portion 5712 that is formed
integrally with an end of the vertical frame portion 5711 at an end
thereof. The track unit 22 has a horizontal top wall 223, which is
formed with a slide slot 224. The sliding element 572 has an
integral bottom plate 5721 that abuts against a bottom surface of
the top wall 223 of the track unit 22, and a sleeve portion 5722
that extends through the slide slot 224 in the top wall 223 of the
track unit 22. The sleeve portion 5722 is sleeved slidably on and
is locked on the horizontal frame portion 5712 by a lock bolt 573.
As such, the movable seat 53 is supported on the supporting
assembly 57, thereby further stabilizing movement of the
former.
[0031] Referring to FIGS. 7, 9, 10, 11, and 12, the radial moving
unit 60 includes a carrier 61, an axle 62, and two wheels 63. The
carrier 61 has a front side surface 611, a rear side wall 612, a
first side wall 613, a second side wall 614, a bottom wall 615, a
retaining hole 616, and an axle hole 617. The axle 62 has a middle
portion 621 that extends through the axle hole 617 in the carrier
61, and two diameter-reduced ends 622, on which the wheels 63 are
sleeved respectively. Each of the wheels 63 has a large-diameter
inner wheel portion 631 that abuts against an inner surface of a
respective one of the first and second side walls 533, 534 of the
movable seat 53 at an outer end surface 6311 (see FIG. 11) and that
abuts against an outer end surface 6211 of the middle portion 621
of the axle 62, and a small-diameter outer wheel portion 632 that
has a diameter smaller than that of the inner wheel portion 631 and
that abuts against a bottom surface of the respective one of the
first and second side walls 533, 534 of the movable seat 53 at an
inner end surface 6312 (see FIG. 11). As such, the carrier 61 is
guided to move in the radial direction of the bar blank 130 (see
FIG. 5).
[0032] Referring to FIGS. 7, 10, and 11, the bottom surface 615 of
the carrier 61 is formed with a dovetail groove 618 that has a
T-shaped cross-section. The tracing unit 70 includes a follower
unit 71 and a locking unit 72. The follower unit 71 includes an
internally threaded cap 711 which is confined within the dovetail
groove 618 in the carrier 61, and a vertical follower post 712
which has an externally threaded upper end 7121 that engages the
cap 711 threadably, thereby connecting the follower post 712
fixedly to the cap 711, and a lower portion 7122 that abuts against
the sample bar 140. The locking unit 72 includes a washer 721 that
is sleeved on the threaded upper end 7121 of the follower post 712
and that abuts against the bottom surface 615 of the carrier 61,
and a lock nut or a lock member 722 that engages the upper end 7121
of the follower post 712 so as to press the washer 721 against the
bottom surface 615 of the carrier 61, thereby fixing the follower
post 712 to the carrier 61. When the lock nut 722 is loosened, the
follower post 712 can move along the dovetail groove 618 of the
carrier 61.
[0033] Referring to FIGS. 7, 8, 9, and 10, the blade unit 80
includes a cylindrical, horizontal blade-mounting rod 81 that is
disposed movably on the carrier 61 and that extends through two
bushings 5311, 5321 on the front and rear side walls 531, 532 of
the movable seat 53, and a blade 82 that is connected fixedly to a
rear end of the blade-mounting rod 81. An upper end of the carrier
61 is shaped as a C-shaped clamp 619 that clamps the blade-mounting
rod 81 therein. The clamp 619 includes two clamp ends 6191 that are
formed respectively with two threaded holes and that define a slit
6192 therebetween, and a lock bolt 6193 that engages the threaded
holes in the clamp ends 6191 so as to lock the blade-mounting rod
81 within the clamp 619. As such, when the lock bolt 6193 is
loosened, the blade-mounting rod 81 can move on the carrier 61.
[0034] The front side wall 531 of the movable seat 53 is formed
with a rail hole 5312 and a blade hole 5313. The manual operating
unit 90 includes a vertical plate 91, an operating lever 92, a
horizontal rod-locking bolt 93, a vertical pivot pin 94, a vertical
engaging bolt 95, a rail-locking bolt 96, and a horizontal guide
rail 97. The vertical plate 91 is bolted to the blade-mounting rod
81 by the rod-locking bolt 93. The operating lever 92 has a pivot
end 921 that is mounted rotatably to the movable seat 53 by the
pivot pin 94, an intermediate portion 922 that is shaped as a
horizontal strip and that is formed with a longitudinal slide slot
9221, and a grip end 923. The pin 94 is fixed within a hole 5343
(see FIG. 7) in the movable seat 53. The engaging bolt 95 is fixed
to a bottom surface of the vertical plate 91, and extends through
the slide slot 9221 in the operating lever 92 so as to convert
rotation of the operating lever 92 into movement of the vertical
plate 91. The guide rail 97 is connected fixedly to the vertical
plate 91 by the rail-locking bolt 96, and extends rearward from a
rear side surface of the vertical plate 91 and through the rail
hole 5312 in the front side wall 531 of the movable seat 53. The
guide rail 97 engages fittingly and slidably the rail hole 5312,
and extends in the radial direction of the bar blank 130 (see FIG.
5) so as to guide the blade 82 to move in the radial direction of
the bar blank 130 (see FIG. 5).
[0035] The spring 120 has a front end that is fastened to the
vertical plate 91, and a rear end that is fastened to the movable
seat 53 so as to pull the vertical plate 91 toward the front side
wall 531 of the movable seat 53.
[0036] The cutting depth-fixing unit 100 includes a horizontal
adjusting disk 101, a positioning post 102, a vertical pivot bolt
103, and a spring-biased ball unit 104. The adjusting disk 101 is
disposed above and locked on the vertical plate 91 by the pivot
bolt 103, and has a pivot hole 1011, through which the pivot bolt
103 extends, and a series of positioning notches 1012 that are
formed along a curved outer peripheral portion 1013 of the
adjusting disk 101 and that are spaced apart from the pivot bolt
103 at different distances. The positioning bolt 102 is fixed on an
upper end of the front side wall 531 of the movable seat 53, and
engages a selected one of the positioning notches 1012 in the
adjusting disk 101 so that the vertical plate 91 is spaced apart
from the front side wall 531 of the movable seat 53 at a
predetermined distance. As such, when the pivot bolt 103 is
loosened, the adjusting disk 101 can be rotated thereabout such
that the positioning bolt 102 disengages from the selected one of
the positioning notches 1012 and engages another one of the
positioning notches 1012, thereby varying the distance between the
vertical plate 91 and the front side wall 531 of the movable seat
53 so as to adjust the position of the blade 82 relative to the
carrier 61 along the radial direction of the bar blank 130 (see
FIG. 5). The spring-biased ball unit 104 includes a retaining tube
1041 that is fixed to the vertical plate 91, a coiled compression
spring 1042, and a ball 1043 that is disposed between the tube 1041
and the spring 1042 and that is biased by the spring 1042 to press
against a bottom surface of the adjusting disk 101 or to engage a
selected one of five positioning holes 1014 in the adjusting disk
101, thereby facilitating positioning of the adjusting disk 101
relative to the vertical plate 91.
[0037] The cutting depth-adjusting bolt 110 engages a threaded hole
912 in the vertical plate 91 and is rotatable to move the vertical
plate 91 relative to the movable seat 53.
[0038] Referring to FIGS. 5, 6, and 7, when it is desired to use
the tracing unit 70 so as to cut the bar blank 130 in a copying
mode, the lock nut 722 is loosened such that the follower post 712
can be moved relative to the carrier 61 to a position, where the
follower post 712 engages a lateral side of the sample bar 140 and
where the lock nut 722 can be tightened. Subsequently, the
adjusting disk 101 and the adjusting bolt 110 are adjusted to
appropriate positions, where the disk 101 is spaced apart from the
positioning post 102 at a distance that is sufficiently large to
prevent the disk 101 from coming into contact with the positioning
post 102 during operation, and where a rear end of the adjusting
bolt 110 is spaced apart from the front side wall 531 of the
movable seat 53 at a distance that is sufficiently large to prevent
the adjusting bolt 110 from coming into contact with the front side
wall 531 during operation. As such, the actuator member 55 can be
rotated in a direction so as to move the movable seat 53 and the
blade 82 along the driving rod 51 such that a groove pattern on the
sample bar 140 is traced mechanically and is duplicated on the bar
blank 130.
[0039] When the sample bar 140 is removed from the sample-holding
unit 40, the operating lever 92 can be held to move the blade 82 in
the axial and/or radial direction of the bar blank 130 so as to cut
the bar blank 130 in a manual mode. Alternatively, the actuator
member 55 and the adjusting bolt 110 can be rotated simultaneously
by the hands of the operator to feed the blade 82. Because the wall
537 is inclined, contact between the blade 82 and the bar blank 130
is visible to the operator during cutting.
[0040] Referring to FIG. 12, when it is desired to fix the cutting
depth of the bar blank 130 (see FIG. 5), the pivot bolt 103 is
loosened so as to rotate the adjusting disk 101 to a desired
angular position so that the positioning bolt 102 engages a desired
notch 112 in the adjusting disk 101. As such, when the actuator
member 55 is rotated, the blade 82 moves along the driving rod 51
in the axial direction of the bar blank 130 (see FIG. 5).
[0041] With this invention thus explained, it is apparent that
numerous modifications and variations can be made without departing
the scope and spirit of this invention. It is therefore intended
that this invention be limited only as indicated by the appended
claims.
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