close

Вход

Забыли?

вход по аккаунту

?

код для вставки
Dem 17, 19.46-
J. E. HECKETHORN
FEEDING AND EJECTING DEVIC
2,412,730
E FOR CENTERLESS GRINDERS
Filed July 7, 1945
2 Sheets-Sheet l
1%
/7
/0
.
INVENTOR.
joH/v, [am/1400 f/zcmsn/o?/v.
ATTORNEY.
J. E. HECKETHORN
2,412, 730
FEEDING AND EJECTING DEVICE FOR CENTERLESS GRIND
Filed July 7, 1945
ERS
2 Sheets-Sheet 2‘
Patented Dec. 17, 1946‘
v
2,412,730
31 PATENT OFFICE
2,412,130
FEEDING AND EJECTING DEVICE FOR 4
.CENTERLESS GRINDERS
J 0hr: E. Heckethorn, Denver, Colo.v
Application July 7, 1945, Serial No. 603,658
,
-
.
(Cl. 51-103).
3 Claims.
1
This invention relates to an automatic infeed
and ejecting attachment for centerless grinding
machines and is designed more particularly as an -
improvement over the invention illustrated in
copending application Serial No. 497,102, now
Patent Number 2,379,961.
.
_
The principal object of this invention is to pro
vide a simple and highly e?icient pneumatically
numeral as follows: bed HJ', grinding wheel H,
feed wheel l2, feed wheel motor housing [3, feed
wheel carriage I 4, feed wheel carriage feed screw
l5, feed wheel feed sleeve 16, hand wheel 11,
grinding wheel motor I 8, grinding wheel hous
ing l9, work rest 20, work rest holder 2|, lower
slide 22, ejection plunger 23, and work pieces 54.
In such a machine the work being ground rests
operated mechanism for automatically placing
workpieces in a centerless grinding machine and 10 upon the work rest 20 between the grinding wheel
l_ land the feed wheel l2. The feed screw I5 is
removing the ?nished pieces therefrom.
Another object of the invention is to so con- > rotated by means of the hand wheel l1,'to bring
the feed wheel carriage l4 adjacent the work.
struct the device that it will operate synchronous
The feed sleeve I 6 is then rotated on the feed
ly with the advance and withdrawal of the feed
screw to move the carriage l4 forwardly fora.
wheel of a conventional centerless grinding ma
present distance sufficient to bring the work to the
, chine.
A still further object is to provide a device of, required ?nished diameter. Therefor the amount
of rotation of the feed sleeve l6 determines the
this character which will be economical to ‘manu
amount of grinding which will be done and the
facture, rugged in structure and positive in opera
sleeve must be circumferentially reciprocated a
tion.
preset distance for each article to be ground. The
Other objects and advantages‘ reside in the de
wear of the grinding wheel is adjusted during
tail construction of the invention, which is de
operation by rotation of the hand wheel l1.
signed for simplicity, economy, and e?iciency.
> This invention is designed to automatically
These will become more apparent from the fol
lowing description.
'
In the following detailed description of the
invention reference is had to the accompanying
drawings which forms a part hereof. Like
numerals refer to like parts in all views of the
drawings and throughout the description.
In the drawings:
‘
Fig. 1 is a side view of a typical centerless grind
ing machine, illustrating the elements of the in
vention in place thereon;
er are shown shaded in the drawings.
'
Fig. 2 is an enlarged, longitudinal section
through the work ejecting mechanism employed
in the improved attachment;
place the work pieces 54 between the wheels ll
and I2; rotate the feed sleeve It at the proper
speed'and for the proper distance to bring the
workpiece to the acquired ?nished diameter; then
' withdraw the feed wheel l2 by return recipro
cation of the feed sleeve l6; and eject the ?nished
30 work piece from between the wheels III and It’.
With the exception of the grinding wheel I I, only
the parts added to the standard centerless grind
The un
shaded parts will be found in all standard ‘ma
35
chines.
'
_
The mechanism for reciprocating the feed
sleeve I 6 is shown and described in detail in the
'
Fig. 3 is a detail, cross-section, taken on the line
said copending application, Serial No. 497,102.,
Fig. 4 is a similar cross-section taken on the
In this invention the same mechanism is used and I
3-—3, Fig. 6;
line 4-4, Fig. 2;
40
will be but brie?y described herein as follows:
A base plate 24 is mounted on the motor hous
ing l3 and carries an operating motor 25 which,
through the medium of a V-belt 26 and a speed
Fig. 6 is an enlarged cross-section through the
reducer
rotates a cam shaft 28. The shaft 28
grinding machine illustrating the attachment in} projects 21,
from both faces of the speed reducer and
45
place thereon; taken on the line 6——6, Fig. 1;
Fig. 5 is a similar cross-section taken on the
line 55-45, Fig. 6;
'
. Fig. '7 is a detail View illustrating a valve opera
ting cam employed in the attachment;
Fig.
of the
Fig.
Fig.
on the front face terminates in a large cam mem
ber 29 provided with a face cam track. A rocker
arm 30 is journalled in suitable hearings on the
8 is a detail view illustrating a face view
plate 23 and projects both above and below the
valve operated by the cam of
1;
60 latter. The upper extremity of the rocker arm
9 is a side view of the valve of Fig. 8; and
terminates in a cam follower 3! which follows the
10 is a cross-section through the valve of
face cam in the member 29 to impart a reciproca
Fig. 9.
'
_
tory movement to the rocker arm 30. The lower
Standard parts of a typical centerless grinding
machine are designated on the drawings by 55 part of the rocker arm 30 is connected to a crank
member 32 on the feed sleeve l6. Thus, at each
2,412,780
medium of a toggle member 63 so that‘each re
rotation of the cam ‘member 29, the feed sleeve
ciprocation of the piston rod of the cylinder 46'
i l6 will be rotated forward and back to move the
will be communicated to the‘ ejector head‘ 6| to '
feed wheel |2 toward the work piece and away
force the ?nished work piece from the work rest. \. ,
therefrom.
The cylinder 46 is also adjustably supported from‘ '
.
The, present invention makes use of the cam 5 an adjusting screw 64 by means of which the
shaft 28 for timing its operation so that the in
feed and ejection of the ‘work pieces will be in
position of the entire assembly may be adjusted.
A rocking yoke 65 is mounted on a pivot pin 66
in the hollow bracket 59. One extremity of the
synchronism with the movements of the rockerv
yoke 65 is positioned opposite the ejection
plunger 23 of the grinding machine. The other
extremity thereof is forked to receive the ejector
arm 30.
The present invention employs a valve cam 33
mounted on the cam shaft 28. A two-way value
housing 34 is mounted in a valve bracket 35 se
rod 68 so as to act against a set collar 61 thereon.
cured to the base plate 24 opposite and below
This enables the operator to use the conventional
the cam 33. The vvalve housing contains a valve
15 ejector mechanism when desired, without inter
plug 36 having a stem 31 projecting from the
ference with the automatic ejector mechanism.
It is believed that the operation of the device
_ housing 34. The stem terminates in a valve operating lever 38 carrying a roller 39 in the path of ' can be understood from the above. ‘Briefly, the
magazine 53 is ?lled with rough work pieces such
the cam 33. Thus, as the cam rotates in a coun
Fig. '7, it will contact '
as artillery shells, and the motors driving the
the roller 39 causing the lever 38 to rotate the 20 grinding and feed wheels I l and I2 and the oper
ter-clockwise direction in
valve plug 36 90°. When the 08111;"33 leaves the >
‘ roller 39 a spring 40 will'return the lever 88 to its
former position.
ating motor 25 are started.
.
Compressed air from any suitable source is sup
plied to the valve housing 34 through a com
l2 against the work-piece so that the desired
amount of material will be removed by the grind
ing wheel
43, respectively. 'The housing is valso provided
tionaltwo-way type, that is,'when the plug is
||.
.
'
The cam 29 will now reverse the sleeve to with!
draw the feed wheel l2 and simultaneously the
30
cam 33 will contact the roller 39 so as to rotate
rotated in one direction it will connect the feed
7
, '
act on the feedsleeve IE to bring the feed wheel
pressed air pipe 4| and flows from and to the
housing through a feed pipe 42 and a return pipe
with exhaust ports 44. The valve is a conven
Let us now assume
that one of the work-pieces is resting on the
work rest 20. The rotation of the cam 29 will
pipe 42 with the compressed air pipe 4| and the
of the exhaust ports 44.
return 'pipe 43 to one
When the plug is rotated in the other direction it 35
will connect the return pipe 43 with the com
pressed air pipe 4| and the feed pipe 42 with one
of the exhaust ports 44. The feed pipe 42 is con
the valve plug 36 to admit air under pressure
from the pipe 4| to the outer extremities of the
two cylinders 45 and 46. 'It will also simultane
ously connect the inner extremities of these cylin
ders with the exhaust ports 44.
This causes the ejector head to force the ?n
ished work-piece from the rest 20 and also causes
the pusher block to force the lowermost rough
work-piece from the pile in the magazine 53 to’
. nected with the outer extremities of an infeed
cylinder 45 and an ejection cylinder 46 through
the medium of ?exible hoses 41, and the return
pipe 43 is connected with the inner extremity of
these two cylinders by means of similar hoses 48.
The infeed cylinder 45 is supported ‘in an .in
verted channel arm 49 which in turn is supported
from the work rest holder 2| in a suitable bracket
50. The bracket 50 also supports a ‘slide track
bar 5| (see Fig. 5), along which, a pusher block
~10
a‘ position between the wheels H and I2.
The
ejector head 6| temporarily supports the latter
work piece and the pusher block 52 temporarily
supports the pile of rough work pieces in the mag
“ azine 53.
The cam 33 now releases the roller 39 allow
ing the spring 40 to return the valve plug 36 to
its former position so as to connect the inner ex
‘ - 52 travels, and a work piece magazine 53 contain
tremities‘of the cylinders 45 and 46 with the
ing a vertical pile of unfinished work pieces 54. 50 compressed air pipe 4| and the outer extremities
The pusher block is designed to-push the lower
with the exhaust ports 44 so that both the pusher
most work piece 54 from the pile inwardly along
block‘ 52 and the ejector head will be snapped
a projecting floor member 55 until it falls by
outwardly. The cam 29 now brings the feed wheel
l2 against the newly inserted work-piece.
gravity to the work rest 20.
The cylinders 45 and 46 are standard actuat
. While a specific form of the improvement has
ing cylinders which may be purchased on the
been described and illustrated herein, it is de
open market and contain a suitable piston (not
shown) for actuating a projecting piston rod 56.
sired to be understood that the same may be
varied, within the. scope of the appended claims,
‘without departing from the spirit of the inven
The piston rod 56 of the infeed cylinder 46 is
connected to the pusher ‘block 52 to reciprocate
the latter inwardly and outwardly. An adjusting
screw 51 is connected to the outer extremity-of
tion.
I the cylinder 46 by means of which the position
of the cylinder 46 may be adjusted to properly
position the pusher block 52.
,ing 59 and terminates in an ejection head 6| po- '
the work rest onto a receiving chute 62 which
carries it from the‘ machine.
‘
The piston rod 56.0f the cylinder 46 is adjusta
bly connected to the ejector rod 60 through the
‘
~
' type having a grinding wheel, a feed wheel and
The ejection cylinder 46 is mounted in a second
inverted channel arm 58 which is supported from
a hollow bracket casting 59 attached to the side
of the work rest holder 2!. An ejector rod 68 ex
tends longitudinally of the arm 58 and the cast
sitioned to force the completed workpiece 54 from
’
Having thus described the invention, what is
claimed and desired secured by Letters Patent is:
l. A work-piece feeding and ejecting attach
ment for centerless grinding machines, of the
a work rest positioned between said wheels com
prising: a horizontal in-ieed guide member ex
tending into the space between said wheels above
said Work rest; a magazine supporting a vertical
,pile of work-pieces on said guide member; a
pusher block positioned to push the lowermost
work-piece from said pile and from said guide
member/so that it may fall by gravity to said work
rest; a pneumatic cylinder; 9. piston in said cyl
75 inder; a piston rod extending from said piston to
2,412,730
5
an operative connection with said pusher block
to actuate the latter; a two-way valve for alter
nately connecting the opposite ends of said cylin
der with a source of ?uid pressure; a motor op
erated device for moving said feed ‘wheel toward
and away from said ‘grinding wheel; means 'for
operating said valve from said latter‘ device so
that the movements of said valve will be in syn- '
block to actuate the latter; a two-way valve for ‘
alternately connecting the opposite ends of said
cylinder with asource of ?uid pressure; a cam
shaft; a motor rotating said cam shaft; a ?rst
cam in said shaft; meansoperable by said ?rst
I cam for-‘moving saidifeed. wheel toward and
‘ away from said grinding wheel; a second cam on
said cam shaft; and means for actuatingvsaid
valve'fromsaid second cam so that the changes
an ejector rod positioned on the opposite side 10 ‘ in
?ow of said ?uid pressure will be in synchro
of the work rest from said pusher block in‘ align- ‘
nism with the movements of said feed wheel.
‘ ment with a work-piece‘resting on said‘ rest; a ~
3. ,Awork-piec'e feeding and ejecting attach
second pneumatic cylinder,- a second piston; a
chronism with the movements of said feed wheel;
ment for, o‘e‘nterless grinding machines, or the
second piston rod connecting said second piston
vtype having a grinding wheel, a feed wheel and'a
with said ejector rod for actuating the latter; and lo work rest positioned between said wheels. com
pneumatic conduits connecting said second cyl-l
inder with said valve so that the‘ latter will con
trol the ejection of the ?nished work pieces from
said work rest.
‘
' prising: pneumatically operated‘ feeding means
for placing a work piece on said work rest; a mo
tor operated device for moving said feed wheel
toward and away from said grinding wheel; a
2. A work-piece feeding and ejecting attach 20 valve controlling said pneumatically. operated
ment for centerless grinding machines, of the
means; means for operating said valve from said
type having a grinding wheel, a feed wheel and
motor operated device so that the movements of
a work rest positioned between said wheels, com
said valve will be synchronized with the move
prising: a horizontal in-i‘eed guide member ex
of said feed wheel; a pneumatically oper
tending into the space between said wheels above 25" ments
ated ejecting means positioned on the opposite
said work rest; a magazine supporting a vertical
of vthe work rest from the pneumatically op
pile of work-pieces on said guide member; a‘, side
erated feeding means and in alignment with a
pusher block positioned to push the lowermost
work-piece resting on said rest; and pneumatic
work-piece from said pile and from said guide
conduits connecting said pneumatically operated
member so that it may fall by gravity to said 30 ejecting means with said valve so that the lat
work rest; a pneumatic cylinder; a piston in said
ter will control the ejection of the finished work
cylinder; a piston rod extending from said pis
pieces from said work rest.
‘
ton toan operative connection with said pusher
JOHN E. HECKETHORN.
Документ
Категория
Без категории
Просмотров
0
Размер файла
577 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа