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Патент USA US2407578

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Sept, 10, 1946.
A. RICKENMANN-
-
' 2,407,577
DEVICE FOR DRESSING GRINDING DISKS
Filed Deb. 17, 1943
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Sept- 10, 1946-
A. RICKENMANN
_
2,407,577 -
DEVICE FOR DRESSING GRINDING DISKS
Filed Dec.
343
17., 1943
‘
3 Sheets-Sheet 2
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‘Sept. 10, 19465
A. RICKENMANN'
_
2,407,577
‘DEVICE FOR DRESSING GRINDING DISKS
Filed Dec. 17, 1945
:5 Sheeté-Sheet 3
#721
21,407,577
Patented Sept. 10, 1946
‘UNKTED sr'rss
orrics ‘
2,407,577
DEVICE FOR DRESSING GRINDING DISKS
Alfred Rickenmann, Zurich, Switzerland
Application December 17, 1948, Serial No. 514,589
In Switzerland December 28, 1942
10 Claims.
(Cl. 125-11)
2
1
by the intermediary change gears [01 the toothed
The invention relates to an improved device for
accurately forming the pro?led working face of
gear I63.
‘
The carriage 2 is moved in the well known
a grinding disk for use in grinding and truing
screw threads.
manner by a lead screw H9 and a set of change
One object of the invention consists in the pro
vision of a device by means of which even not
high grade diamonds of any suitable shape may
speed gears 19 interconnecting spindle 5 and
lead screw Hi3. ‘By bringing the clutch member
7 be used for dressing the grindingwheel and to
in engagement with one or the other gear [03
or ass the travel of the carriage 2 and the direc
produce thereon ridges of perfect pro?le for ac-
tion of rotation of spindle B and therewith of the
curately grinding screw threads.
Another object consists to provide means to
work piece’ 5 is reversed.
The clutch member 9 is‘ actuated by a lever 23
automatically adjust the dressing tool with ref~
which is connected by a link 23I to the rod 22
of a piston 12! slidably arranged in a cylinder 26.
erence to the grinding disk in conformity to the
The latter is provided with ports 2M, 25'2 com‘
‘wear thereof and to compensate the same.
I attain these and other objects by means of 15 municating with the casing of a piston valve IS.
The valve casing communicates by a pipe 263
a simple device which may be brought in and out
with a hydraulic pump P and is provided, with
of operation either by hand or by automatic gov
two ‘exit ports 204, 205. The piston valve i9 is
erning devices in a predetermined sequence of
connected by a linklel with the armature l8l
operations.
In the‘ accompanying drawings the new device 20 of two electromagnets i8. By exciting the elec
tromagnets iii the armature l8! shifts the‘pi'ston
is shown in a diagrammatical manner by way
of an example in connection with screw thread
grinding wheels of any of the well known con
structions.
‘
valve l9 to allow oil under pressure to pass on
either side of piston 2|. The circuits in which
the electromagnets I8 are arranged are opened
‘
Fig. 1 shows in a side elevation a thread grind
25 and closed by a reversing switch I‘! which is ac
tuated by the dogs l5, It adjustably mounted on
ing machine parts being shown in section.
Figs. 2 to 8 are‘ cross-sections taken respec
the carriage 2.
‘
The valve 19 controls moveover the ?ow of oil
from the pump P to a cylinder 48 by the pipes
tively on the lines 2-2; 3—3; li-t; 5-5; 6-5;
'i—'l; and 8-8of Figs. 1 and 2.
Figs. 9 and 10 are sections on the lines ll-—9 iii 38, 39. The piston M of cylinder 4a is provided
with a rack (Figs. 1, 2) meshing with a toothed
gear 42 rotatably mounted on a ‘shaft 55 jour
Figs. 11 to 14 are a front view, a side view, a
nalled in the base !. On the hub of gear 42 an
back View and a top view of the cam plate actu
and lii—i€l of Fig. 8.
ating the dressing tool.
arm 43 is keyed carrying a spring actuated pawl
_
~ 44 engaging a ratchet wheel 45 fast on shaft 55
Fig.‘ 15 illustrates the manner of the operation
ranged in the usual manner adapted to receive
(Figs. 2, 16). A pawl M4 (Fig. 16) engaging
ratchet wheel 45 retains same in its position.
On the shaft 55 a rotary distributing valve 3?
is arranged within a casing 31! (Figs. '2 to 5)
controlling the flow of pressure oil through pipes
35, 36 (Figs. 1, 2) to a cylinder 32 fast on a slide
the work piece. 5 between their centres. The
driving spindle 6 is journalled in the ‘headstock
3! (Figs. 1, 8, 10) of the carriage 25 in which the
grinding disk 26 is journalled the edge of which
3, it is positively driven by a worm it and a worm
wheel Mwhich is keyed to spindle ii. The worm ;
i3 is driven “by a-shaft 12 which is connected to
the worm shaft by
universal joint l2! and
is to be trimmed.
The carriage 25 is slidably mounted on the base
of the diamond.
‘
Fig. 16 shows a detail of construction.
On a base i of a screw thread grinding ma
chine a carriage 2 is slidably mounted.
On the
carriage 2 a headstock 3 and a tailstock d are ar
by another universaljoint with shaft ii. The
4.:
‘i. ‘A'weight 353 (Fig. 2’) ‘?xed to a band 33]‘ and
running over a pulley 302 tends to draw the‘car
riage 25 and therewith the grinding disk 26 away
from the work piece 5. To the carriage ‘25 a nut
latter is driven by bevel gears Iii‘ from a shaft Hll
journalled in a gear box "i. On the shaft llll a 50 29 is fastened with which a screw threaded shaft
2a is in engagement. The latter is journalled in
sleeve "32 is slidably mounted‘ on a key thereof,
the base I and carries a hand wheel 2'! by turn
it may be brought in engagement either with
ing of which the carriage 25 maybe adjusted by
toothed gear IE3 or with gear Hit; The shaft I0!
hand. The shaft 28 co-op'erates moreover with
is driven by the motor 8 and the gear W5 mesh
ing with gear I04 or by change gears “)6 driving 55 the shaft 55 by means of a cam 5'! keyed to shaft
2,407,577
3
55 (Figs. 2, 6).
4
.
With the cam 51 contacts an
key 134.
The casing 13 is provided with 2. lug
arm 6| of a sleeve 6| | rotatably mounted on shaft
15 (Fig. 9) and in the path of lug 15 project ‘two
28. A coiled spring 53 (Fig. 6) keeps the tooth
stop screws 15, l‘! adjustably mounted in the
slide 3|. The stops 15, ll limit the movement .of
casing 13 when the latter is reciprocated by the
piston 33 and the rack 688 of ‘sleeve 68. The
62 of the arm 6| in contact with cam 51 which
when turning with shaft 55 rocks the arm 6| and
therewith the sleeve 6| i. On a second arm 6|‘:
of sleeve 5|! a pawl E54 is mounted (Fig. 6) en
gaging a ratchet wheel 65 (Figs, 2, 6) keyed to
shaft 28. By turning shaft 55 by means of pis
ton 4| say for an angle a and by setting thereby
the distributing valve 31 the ratchet'wheel 65 is
also turned and therewith the shaft 28. The car
riage 25 is moved with reference to the work
piece 5 as will be explained hereinafter. The
way of piston 4| and therewith the angle about
which the shaft 55, the distributing valve 31 and
the shaft 28 may be turned may be limited by
any one of a plurality of pins 45 (Figs. 1', '7).
rocking movement of casing 13 differs While the
stroke of the piston 33 is always a full stroke;
Between a shoulder of piston rod 34 and'a nut
|i8| of sleeve 38 a spring 13 is arranged. The
nut 68| rests on a washer 682 fastened to the
piston rod 34.
The spring ‘it which is under
tension allows a movement oftheslide 53 with
reference to piston rod 34. The piston 33 may
-' perform therefor a full stroke whatever the-way
. of the casing 13 will be.
The piston rod 34 is provided with a tooth B3
projecting through a slot of sleeve‘ 58 and co- 7 '
operating with a cam plate 18 (Figs. 8 to 14)
The pins 46, 46!, 462, 463, 464, 465, 466 are fas
tened-to the face of a toothed gear 49 journalled 20 rockingly mounted on a shaft 79 of slide 3|. The '
in the base |. The pins 46, to 456 are all of dif
ferent lengths each one may be brought in the
path of piston 4| by turning the gear 49 by means
reciprocating pistonv rod 34 forces the tooth 657
over thecams 18] to 785 formedon theone face
of lever 18. On the other face‘ vthe cam‘lever
of a toothed gear 5|] fast on a shaft 5!. The
‘E8 is provided with a segmental row of teeth |l3|.
latter is journalled in the base | it may be ro 25 A pin Bel of a block 863 is in engagement with
tated by a knob 52. A scale 53 indicates which
said row of teeth |18|, the block 8?! being slid
ably mountedV in the casing 73. The block 85] is_
one of the pins 45 is in its operative position.
The travel of piston 4| is limited at its other end
provided with a rack 8| meshingwith a'toothed ‘
by an abutment 41 (Fig. 1) fixed to cylinder 4!}.
gear 82 on a shaft 86. With the gear SZarack .
The shaft 55 and therewith shaft 28 may further 30 33 is in engagement on which a spring84 is act~
be turned by hand by means of ashaft 59 carry
ing tending to keep pin 80! in contact with le
ing a hand wheel 65 and a toothed gear 58 mesh- 7 ver 18 andthe latter in contact withv tooth 69;
ing with a gear 56 keyed to shaft 55 (Fig. 2).
Any movement of the pin Bill is transmitted to '
' The cylinder 32' (Figs. 2, 8 to 15) with piston
shaft 36 on the face of which a pointed diamond
33 which operates the dressing tool "14 (Fig. 8) -' piece ‘I4 is eccentrically mounted adapted to work
is arranged on the slide 3| which may be ver
the ?anks of the grinding disk 26 (Figs. 8, 15).
tically adjusted with reference to the grinding
The shaft may be adjusted in axial direction by '
a nut 81 screwed on the screw threaded portion
disk. 26 by means'of a screw threaded spindle
93 screwed in a nut 94 of the carriage 25. The
'i'3| of the casing 13. The nut 81 acts on a ball ‘
bearing 833 ?xed to shaft 85 by a screw. 85 and
shaft‘93 carries a hand wheel 95 and a ratchet
displaces the shaft 86 against the action of a,’
wheel 92 with which a pawl 9| is kept in engage
springgBM.
.
.
ment bya spring 9|! (Fig. 10). The pawl 9| may
The piston rod 34 oscillates by means of rack
be withdrawn from the ratchet wheel 92 by a
688 and toothed gear the casing 13. The pin 8ll|
knOb'SB.‘ The pawl 9| is arranged in a, casing
9|0 which‘ is rockingly mounted in the slide 3| 45 passes thereby over the toothed segment '|8|
mounted on shaft 19 of the casing 3| and trans
and which may be rocked by a pin 89 actuated
mits a vibratory movement to the tool 14 depend
by the rod 34 of the piston 33 of cylinder 32.
ing on the number and the height h (Fig, 14)
"The pawl 8| turns wheel 92 and shaft 93 on
each stroke ofpiston 33 and feeds the slide 3|
of the teeth l'l8l. In addition’ thereto the cam
and therewith the tool'14 towards the grinding 50 plate ‘i8 is rocked about shaft l9 and the .Pin
wheel 26. The piston 33 is provided with an an
8M displaced. Shaft 85 is turned‘ by the tooth '
B9 of piston rod 34 passing over the ridges 83 into
nular groove 33| (Fig. 10) into which enters one
the recess 88|~on the face of plate 18.. Thetotal
length of the distances '|8| to 185 of .plate 18
lid 61 of cylinder 32. The catches '91, SH are 55 equals the length of the distance 34| (Figs. 10,
brought in engagement with the piston 33 by
14) and the total distances 34|, 342, 343 is equal
to the full stroke of piston 33. When the piston
springs 98 and‘ 98! and are brought out of en
of two catches 91 or 91! as soon as thepiston
33 comes to bear on the'abutment 66 or on the
gagement therewith by oil pressure acting on
33 makes one full stroke the tooth 69 passes
over the distance 183 'of the cam platej18 and
the faces 99 and 99| of the catches B1, 91!. In
the position of piston 33 shown in Fig. 10 oil 60 the casing 13 passes from stop ‘16 to'stop 11 or vice
under pressure enters by pipe 36, the catch 59|
versa and ratchet Wheel 32 and therewith spin
has released piston 33, the latter moves to the
dle 93 makes a part rotation, adjllsting'the slide.
.left and actuates by its rod 34 and a bevelled
3| towards the grinding disk 26. While the vtooth
face 342 the pin 89and therewith the feed screw '
69 passes over the portion ‘733 of the cam 18 the
93. On the return stroke of piston 33 the bev 65 latter remains stationary and only a vibratory
elled face 343 of ‘piston rod 34 actuates said pin
motion is imparted to the tool '14 by the teeth
8Bv again. The faces 342, 343 areapart for-‘a . ‘|8|. The tool 14 performs oscillating movements
distance equal to 34L the feeding of the slide
I-I (Fig, 15) . While the casing 13’ is rocking about
3| and the tool 14 is timely distanced and co
axis X--X of shaft 12 from one stop 16. to stop
ordinated to'other functions which the piston 33 70 1‘! or vice-versa the tool 14 passes over the cen- .
is to perform. On the piston rod 34 a sleeveGB
tre line (3-40
15) of the grinding disk 26. r
is slidingly mounted being provided with a rack
The latter is rounded off- the.“ radius R' corre
688 engaging a pinion ‘I! (Fig. 8) keyed to a
sponds to the radial distance of the working point
shaft 12.’ The latter is journalled' in the slide
of the tool 14 from the axis of rotation: Iii-X"
3| ‘and carries on its free end a casing 13, by a 75 denoted by r in Fig. 8.
2,407,577,
5
The length of the straight portion 183 of the
cam '58 corresponds to the greatest angle through
which the casing 13 may swing, the said angle
corresponds to the greatest possible angle a, Fig. '
i5, enclosed by the ?anks E, F of the‘grinding
disk 2%. When the casing 13 comes to bear
either on stop ‘it or on stop ‘ll the cam plate ‘It
cannot
any further about the axis of shaft
E2 the oscillatory movement of the tool ‘it is in;
terruptedv The piston rod 34 moves on and the
tooth $3 co~operates now with one of the por
of piston Ill the latter has to perform several
strokes to turn the valve 31 for half a fullxturn.
Each reversal of piston ill corresponds to a re
versal of piston 2i andtherefore tothe reversal of
direction of rotation of work piece Eand table 2
as the piston 21 commands the reversing clutch
9. By placing a certain stop pin Mil to 566 in
‘ the way of piston M by :nob 52 the number of
strokes of table 2 and of‘reversals of the shaft 6
may be determined until the piston. 33 makes a
stroke and sets the tool ‘Hi to work on the grind
ing disk 26. The valve’ 3‘! may be set by‘ hand
tions ‘i812 or ‘564% of the cam plate 78. The latter
by means of knob Gil (Fig. 2) on shaft 59 on
is rocked about the shaft ‘l9 by the combined
which the gear 53 is keyed meshing with gear 56
action of’ the tooth B9 and of the spring 84. Each
_
portion 182 and ‘F84 has three flanks over which 15 fast on shaft 55.
The cam 5's (Figs. 2 ant. 6) and the valve 3'!
the tooth 69 passes successively rocking thereby
fastened on the same shaft 55. The position
the plate ‘(8 about the shaft ‘19. The plate ‘I8
of the active ?ank G of cam at with reference to
moving in one direction transmits its movement
the ‘point 52 of the lever E! in Fig. 6 corresponds
over the members Sal, 85),. 8|, 82 to shaft 85 and.
to the position’ of the valve 31 with reference to
to tool ‘It against the action of spring 84. The
tool ‘M is swung over the ?ank E or F. The spring
86 returns the plate ‘is and keeps the same in
the ports of the pipes 35,
in Fig. 4. While the
valve 3‘? turns about angle [3 the
5‘! turns
about a like angle or. The change of pressure in
the sipes 35 and 56 takes place while the cam
contact with tooth (it. The tool ‘It swings three
times over the flank E or F while the tooth 69
passes over the portion ‘it?! or ‘ltd of plate 18. It 25 51‘! passes the angle on. The cam Ell therefore
shifts the ratchet wheel 65 and turns therewith
may happen that the pint?l comes to rest on the
the shaft 2?» and advances the carriage 25 at that
ground or on the top of a tooth of the segment
moment at which the pressure in the pipes 35, 35
i8? and in such’ a case the tool ‘M would not be
and therewith on the side of the piston’ 33 changes
rocked‘ far enough to work the flank E or F of
grinding disk 25 on its whole breadth. To obviate 30 and that timely co-incides with its positions'at
one of the ends of. cylinder. 32, that is when the
thisdrav'rback the edge 88 is slightly above and
the edge 85! slightly below the plane of the centre
portion ‘21%. After the tooth 89 has passed the
portions 132 or ‘it!!! the piston rod 34 still moves on
the tooth 69 passing over the end portions ‘H8! or
‘Hit. By passing these portions ‘I8! and ‘I85 the
tool H- is brought out of contact with the disk 26.
‘ tooth E53
free off the cam plate ‘58 and with
the tool it out of contact with the grinding disk
2%. A part rotation of cam 5'5 equal to angle on
will compensate the Wear of the grinding disk
This compensation takes place positively but
only after the piston 33 has performed a stroke
‘thereby initiated the dressing oi the grinding
disk 25.
tions $42 or. 343 actuate the pin 39 and feed the
What I wish to claim by United States Let
tool "ill towards the grinding disk 26. After each 40
ters Patent is:
stroke of the piston rod 34 the tool 14 is advanced
1. In a screw thread grinding machine, the
towards the grinding disk 216. The infeed of the
combination of a reciprocable work carriage and
slide 3! towards disk 25 is equal to the infeed
a tool carriage mounted for cross-feed movement
of the carriage 25 towards he work piece 5 by
means of the cam disk 51. The piston 33 re 45 in a direction transverse to the path of recip
rocation of said’ work carriage, manually oper
mains stationary at its end position as long as the
able means to adjust'said tool carriage, power
oil exerts pressure on it. 'To (prevent the piston
actuated means for reciprocating said work car
to leave this end position accidentally, for in
riage, a grinding disk rotatably mounted in said
stance by stopping the machine, the above de
tool carriage about an
substantially parallel
scribed catches ill. Sill are provided for. The
to said path of reciprocation of said work car
catches are brought out of their catching po
With the tool ‘it in this position the bevelled por- V
sition as soon as the oil pressure on the faces 99
Triage, a slide mounted on said tool carriage for
moven‘ient thereon at a right angle with respect
Sill attains a certain hight suf?cient to over‘
to. the movement of said tool ‘carriage, a hous
come the pressure of the springs 9B, 98!.
in which is arranged a grinding disk dressing
By starting the machine. the motor 8 drives the 55
tool.
housing
mounted for oscillatory
spindle 6 and work piece '5 and table 2 moreover
movement on said slide, a second manually oper
oil is supplied by pump P and pipe 283 to cylinder
able
for adjustirn said slide to bring said
Ez'l and to the distributing valve 31. The table 2
dressing tool into operative position with respect
actuates by its dogs 15, it switch l‘l' electro mag
grinmng disk, means in said slide
os
nets it, the valve is and the reversing gear. 60 to
cillating said housing and said dressing tool,
lvloreover oil under pressure is brought to recipro
means operated by said oscillating means for
cate the piston All which turns step ‘by step the
rotating said dressing tool in said housing, where
distributing valve 31. The latter governs the flow
of oil to the cylinder 32 by the pipes 35, 36 to op- '
by said vmessing tool is moved once over the‘
crate the piston 33 and therewith the cam plate 65 grinding face of the grinding disk during each
cs atlng‘ movement of said housing, and means
‘53 and the tool ‘54. The valve 3‘! reverses the
at dated by said power actuated
oper
stroke of piston 33 when completing half a turn.
at g
oscillating means in timed relation to
Therefore the tool ‘M is set to work only when the
lovernent of said work carriage, namely when
valve 3? has been turned by piston M by half a
full‘rotation. The way of piston Al may be varied 70 the latter ohangesits direction of movement.
‘11in, a screw thread grinding machine, the
by placing one of the several stop pins 46 in its
combination of a reciprocabie Work carriage and
path. The pins it are positioned by turning the
gear all by knob 52. ‘ By making a full stroke the
a tool carriage mounted for cross-feed .move
merit in a direction transverse to the path of
piston ill turns the valve 31 for half a full turn,
by placing any of the pins Mil to 466 in the path 75 reciprocation of said work‘ carriage, manually V_
2,407,577:
8
operable means to adjust said tool carriage, power
tool,'said housing being mounted for oscillatory
actuated means for reciprocating said work car
movement on said slide, a second manually oper
riage, a grinding disk rotatably mounted in said
tool‘ carriage about an axis substantially parallel
to said path of reciprocation of said work car
able means for adjusting said slide to bring said
dressing tool into operative position with respect
to said grinding disk, means in said slide for '
riage, a slide mounted on said tool carriage for
movement thereon at a right angle with respect
to the movement of said tool carriage, a hous
ing in which is arranged a grinding disk dressing
oscillating said housing, and said dressing tool,
means actuated by said power actuated means
' for operating said oscillating means in timed
relation to the movement of said’ work carriage,
tool, said housing being mounted'ior oscillatory 10 namely when the latter changes its direction of
movement on said slide, a second manually oper
movement, means for automaticallyv operating
able means for adjusting saidlslide to bring said
said ?rst mentioned manually operable means
to advance the tool carriage toward the path of
dressing tool into operative position with respect
'
to said grinding disk, means in said slide for
movement of the work carriage a distance which
oscillating said housing and said dressing tool, 15 compensates for the amount of wear caused by
means operated by said oscillating means for
the dressing tool on said grinding disk, said auto
rotating said dressing tool in said housing, where
matic advancing means being operated by said
by said dressing tool is moved once over the
power actuated means, and means for automati
grinding face of the grinding disk during each
cally operating said second manually operable
oscillating movement of said housing, means ac 20 means to feed the dressing tool toward the grind
tuated by said power actuated means for oper
ing disk, said last named means being operated
ating said oscillating means in timed relation to
by said means oscillating said housing and'said
the movement of said work carriage, namely
when the latter changes its direction of move
5. In’ a screw tlxead grinding machine, as
ment, and means for automatically operating said 25 claimed in claim 1, in which said‘ means for
?rst mentioned manually operable means to ad~
oscillating said housing and dressing tool in—
Vance‘ the tool carriage toward the path of move
clude a power actuated piston mounted for recip
ment of the Work carriage a distance which com~
rocable movement in said slide, a piston rod se
pensates for the amount ‘of wear caused by the
cured to said piston and supporting a member
dressing tool on said grinding disk, said auto— 30 provided with rack teeth, a shaft having gear
matic'a'dvancing means being operated by said
teeth 'meshing with said rack teeth and .sup
dressing
power actuated means.
tool.
'
a
>
V
ported by said slide, said housing being attached
3. In a screw thread grinding machine, the
to said shaft to oscillate with the latter, a cam
combinationof a reciprocable work carriage and
plate pivotaily mounted within said slide and
a tool carriage mounted for cross-feed movement 35 engaged by a lateral extension on said piston
in a direction transverse to the path’ of reciproc
rod, said dressing tool being rotatably mounted
cation oi‘said work carriage, manually operable
in said housing, and van operative connection
between said cam plate and said dressing tool
means to adjust said tool carriage, power actu
ated means for reciprocating said work carriage,
for rotating the latter: about-an axis at a right '
,a grinding disk rotatably mounted in said tool 40 angleto the axis of said shaft when said hous
carriage about an axis substantially parallel to
ing is"being oscillated, whereby said dressing
said path of reciprocation of said work car
too-1 is caused to progressively engage first one
riage, alslide mounted’ on-said tool carriage for
flank of the grinding disk, then the apex of the a
movement thereon at a right angle with respect to
the movement of said tool carriage, a housing in
‘which is arranged a grinding disk dressing tool,
said housing being mounted for oscillatory move
ment on said slide, a second manually operable
means for adjusting said slide to bring said dress
ing tool into operative position with respect to
said grinding disk, means in said slide for oscil
lating said housing and said dressing tool, means
actuated by said power actuated means for oper
ating said oscillating means in timed relation
to the movement of said work carriage, namely
when the latter changes its direction of move
ment, and means for automatically operating
said second'manually operable means to feed
45
same and.- ?nally the other flank of said disk
during each. movement of said piston in one
direction.
;
I
’
~~6.'In a screw thread grinding machine as
claimed in claim 3, including a power actuated
piston mounted for reciprocable movement in
said slide, a piston rod secured to said" piston
and supporting a member provided with rack
teeth, a cam face on said piston rod adapted to V
actuate said second manually operable means to
automatically feed the slide, and therewith the
55 dressing_tool toward the grinding disk one step
during each reciprocating movement of said pis-'
ton, a shaft having gear teeth meshing with said
rack teeth and supported by said slide, said hous
the dressing tool toward the grinding disk, said
ing being attachedto said shaft to oscillate" with
last named means being operated by said means 60 the latter, a cam plate pivotally mounted within
oscillating said housing and said dressing tool.
said slide and engaged by a lateral extension
4. In a screw thread grinding machine, the
on‘ said piston ‘rod, said dressing tool being ro- '
combination of a reciprocable work carriage and
tatably mounted in said housing, and an opera
artool carriage mounted for cross-feed movement
in a direction transverse to the path of recipro
cation of said work carriage, manually operable
means to adjust said tool carriage, poweractu
ated means for reciprocating said work carriage,
tive connection between said cam plate and, said ,
65 dressing tool for rotating the latter about an axis 7
,a grinding disk rotatably mounted in said tool’ '
at a right angle to the axis of said shaft when
said'housing is being oscillated, whereby said
dressing tool is caused to progressively engage
_ ?rst one ?ank of the grinding disk, then the apex
carriage about an axis substantially parallel to 70 of-the same and finally the other‘?ank of said
said path of reciprocation of said work car
disk during each movement of said'pist'on in one
riage, a slide mounted on said 'tool carriage for
movement thereon at a right angle with respect
,7. In a screw thread grinding machine as
direction.‘
.
‘
,
'
a
>
,
to the movement of said tool carriage, a housing
claimed in .claim 1', in which. said means for
in which is arranged a grinding disk dressing 75 oscillating said housing and dressingtool include >
2,407,577
a power actuated piston mounted for reciprocable
movement in said slide, a piston rod secured to
said piston and supporting a member provided
with rack teeth, a shaft having gear teeth mesh
ing with said rack teeth and rotatably supported
in said slide, said housing being non-rotatably
attached to said shaft to oscillate with the lat
ter, a cam plate pivotally mounted within said
slide about an axis parallel to said piston rod,
10
ment in a direction transverse to the path of
reciprocation of said work carriage, manually
operable means to adjust said tool carriage, power
actuated means for reciprocating said work car
riage, a grinding disk rotatably mounted in said
tool carriage about an axis substantially parallel
to said path of reciprocation of said work. car
riage, a slide mounted on said tool carriage for
movement thereon at a right angle with respect
said cam plate having a cam surface on one of 10 to the movement of said tool carriage, a housing
its sides engaged by a lateral projection on said
in which is arranged a grinding disk dressing
piston rod, said dressing tool being rotatably
tool, said housing being mounted for oscillatory
mounted in said casing by being attached eccen
movement on said slide, a second manually oper
trically to the end face of a shaft journalled in
able means for adjusting said slide to bring said
said casing, said last named shaft carrying a pin 15 dressing tool into operative position with respect
ion engaging a rack slidably mounted in said
to said grinding disk, means in said slide for
casing, said rack being urged lengthwise in yield
oscillating said housing and said dressing tool,
ing engagement with the other side of said cam
means operated by said oscillating means for
plate to be slidably moved when said cam plate
rotating said dressing tool in said housing, where
is moved about its pivot by the lateral projection 20 by said dressing tool is moved once over the
on said piston rod when the latter is recipro
grinding face of the grinding disk during each
cated to oscillate said housing, whereby said
oscillating movement of said housing, means
dressing tool is caused to progressively engage
actuated by said power actuated means for oper
?rst one ?ank of the grinding disk, then the
apex of the same and ?nally the other ?ank of
said disk during each movement of said piston
ating said oscillating means in timed relation
to the movement of said work carriage, namely
when the latter changes its direction of move
in one direction.
ment, and stop means on said slide for positively
8. In a screw thread grinding machine as
limiting the extent of the oscillatory movement
claimed in claim 1, in which said means for oscil
of said housing in both directions.
lating said housing and dressing tool include a 30
10. In a screw thread grinding machine, the
power actuated piston mounted fer reciprocable
combination of a reciprocable work carriage and
movement in said slide, a piston rod secured to
a tool carriage mounted for cross-feed movement
said piston and supporting a member provided
in a direction transverse to the path of recipro
cation of said work carriage, manually operable
with rack teeth, a shaft having gear teeth mesh
ing with said rack teeth and rotatably supported 35 means to adjust said tool carriage, power actu
in said slide, said housing being non-rotatably
ated means for reciprocating said work carriage,
a grinding disk rotatably mounted in said tool
attached to said shaft to oscillate with the latter,
a cam plate pivotally mounted within said slide
carriage about an axis substantially parallel to
said path of reciprocation of said work carriage,
about an axis parallel to said piston rod, said
cam plate having a cam surface on one of its 40 a slide mounted on said tool carriage for move
sides engaged by a lateral projection on said pis
to the end face of a shaft journalled in said
casing, said last named shaft carrying a pinion
engaging a rack slidably mounted in said cas
ment thereon at a right angle with respect to
the movement of said tool carriage, a housing in
which is arranged a grinding disk dressing tool,
said housing being mounted for oscillatory move
ment on said slide, a second manually operable
means for adjusting said slide to bring said dress
ing, said rack being urged lengthwise in yield
ing tool into operative position with respect to
ing engagement with the other side of said cam
plate, to be slidably moved when said cam plate
said grinding disk, means in said slide for oscil
lating said housing and said dressing tool, means
ton rod, said dressing tool being rotatably mount
ed in said casing by being eccentrically attached
is moved about its pivot by the lateral projec
actuated by said power actuated means for oper
ating said oscillating means in timed relation to
tion on said piston rod when the latter is recip
rocated to oscillate‘ said housing, whereby said
the movement of said work carriage, namely
‘dressing tool is caused to progressively engage
when the latter changes its direction of move
ment, means for automatically operating said
?rst one ?ank of the grinding disk, then the
apex of the same and ?nally the other ?ank of 55 ?rst mentioned manually operable means to ad
vance the tool carriage toward the path of
said disk during each movement of said piston in
one direction, and means on that side of the cam
plate which engages said rack for causing the
latter and therewith said dressing tool to vibrate ,
while the housing is being oscillated by said pis
ton.
9. In a screw thread grinding machine, the
combination of a reciprocable work carriage and
a tool carriage mounted for cross-feed move-
movement of the work carriage a distance which
compensates for the amount of wear caused by
the dressing tool on said grinding disk, said
60 automatic advancing means being operated by '
said power actuated means, and means for ren
dering said automatically operating means inop
erative at will.
‘
ALFRED RICKENMANN.
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