US920669A - Device for automatically arresting the feed-motion in grinding-machines. - Google Patents

Device for automatically arresting the feed-motion in grinding-machines. Download PDF

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US920669A
US920669A US46328708A US1908463287A US920669A US 920669 A US920669 A US 920669A US 46328708 A US46328708 A US 46328708A US 1908463287 A US1908463287 A US 1908463287A US 920669 A US920669 A US 920669A
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bolt
feed
grinding
motion
screw
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US46328708A
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Friedrich Schwerd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/16Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the load

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  • the finger employed consists of a pivotally mounted long lever which lengthens considerably the movement of the feeler pin against the work, and thus causing the dis advantage that the unavoidable swinging motion of the work is magnified in the same roportion so that the contacts are liable to, lie closed prematurely while at the same time the mounting of the lever on a rotating axis also results in iiniccuracies.
  • These defects are obviated in the subject of the present applicat on by replacing the said lever by a bolt capable of rectilinear displacement in a guide, a contactpiece being fastened directly on to the bolt. The swinging movement cannot undergo any amplification and hence the highest degree of accuracy is at-- tained with this device.
  • the bolt 1 is pressed by the spring 2 so that its outer terminal surface presses in a radial direction against the work.
  • the sliding collar 3 is rigidly connected to the bolt 1 and moves in the bearing 4.
  • At its other end tho holt 1 carries the how 5 which surrounds the two contact devices and is provided with a micrometer screw 8, together with the graduated head i] and pointer 10.
  • a small lever 11 which is supported against a nut 12 serving to tighten up the spring '2
  • the bolt can be drawn back from contact with the work.
  • the whole device. is mounted on a slide-rest 14, '15 which gives a motion parallel to and at right angles with the. work.
  • the device may be set by the aid of the graduated head 9 and pointer 10, so as to give the interval S corres )onding to the desired coarse grinding, whi e the interval 5, corresponding to the desired iine grinding, can be set, if nec essary, by means of the graduated head 13.
  • the contacts 6, 7 touch one another and thus stop the feed motion of the grinding wheel.
  • a device for automatically arresting a feed motion the combination of a longitudinally movable bolt; a spring for normally holding said bolt in contact with the work; a micrometer screw; connections between said screw and said bolt; and an electrical contact adapted to be controlled by said )ring through said connections, substantially as (lGSLI'ilJPLl.
  • a longitudinally movable bolt in a device for automatically arresting a feed motion, the combination ol a longitudinally movable bolt; a spring for normally holding said bolt in contact with the work; a micrometer screw, the axis of which is longitudinally adjustable; (wnrncctions betwi-cn said screw and said bolt; and an electrical contact, one member of which is rigid with said axis, ada )ted to be controlled by said spring through said connections and independentl v through the adjustment of said screw, substantially as described.
  • a device for automatically arresting feed motions the combination of -a longitudinally movable bolt; a spring normally controlling the same; a nncron'ieter screw connected to said bolt; means for adjusting said 3 bolt longitudinally; an electrical contact controlled by said screw and adapted to be closed by said spring; and means permitting said bolt to be moved transversely, substantially as described.
  • a device for automatically arresting feed motions the combination of a longitudinally movable bolt; a spring normally controlling the same; means for adjustingthe tension of said spring; a micrometer screw connected to said bolt; means for adjusting said bolt longitudinally; an electrical contact controlled by said screw, one member of said contact being carried by said screw; said contact adapted to be closed by said spring, and independently closed by said screw; and means permitting said bolt to be moved transversely, substantially as described.
  • a device for automatically arresting feed motions the combination of a bolt; a spring controlling the motion thereof; a milcrometer screw; connections between said bolt and screw; an electrical contact adapted 1 to be closed by said spring; a second electrical contact; and a second micrometer screw controlling the same, substantially as described.
  • a device for automatically arresting feed motions the combination of a bolt; a spring for moving the same longitudinally; means to adjust the tension of said spring; a micrometer screw; connections between I I i i l FRIEDRICH SOHWERD.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Description

, F. SOHWERD. DEVICE FOR AUTOMATICALLY ARR ESTING THE FEED MOTIOA IN GRINDING MACHINES.
APPLICATION FILED NOV. 18,1908.
Patented May 4, 1909.
UNKTED STAT E FRIEDRRH SCHWERI). ()l FHANKl OltT-UN llilfl-MAIN. (IERMAN Y.
DEVICE FOR AUTOMATICALLY To all whom it may concern- Be it known that I, FRIEDRICH SCIIWEHI), head engineer, and resident of i111 'lrutz Frankfurt 18, l ranktort-on-the-llirin, King doni of Prussia, German Empire, have invented new and useful linprm'einents in l)evices for Automatically Arresting the Feed- Motion in Grinding-Machines, oi-whicb the following is a specification.
instead of tne devices formeriy employed for arresting the feed motion of a grinding wheel or the like. by releasing a s )ring, it has already been proposed to use a hnger which is pressed elastically against the work and, as soon as the latter has been ground to the desired extent, influences an electric contact that interrupts a quiescent current or completes a working current and thereby stops the feed. in onoiot these. known arrangements the finger employed consists of a pivotally mounted long lever which lengthens considerably the movement of the feeler pin against the work, and thus causing the dis advantage that the unavoidable swinging motion of the work is magnified in the same roportion so that the contacts are liable to, lie closed prematurely while at the same time the mounting of the lever on a rotating axis also results in iiniccuracies. These defects are obviated in the subject of the present applicat on by replacing the said lever by a bolt capable of rectilinear displacement in a guide, a contactpiece being fastened directly on to the bolt. The swinging movement cannot undergo any amplification and hence the highest degree of accuracy is at-- tained with this device. of this kind are also attended with the defectthat the only way to adjust the contacts is by means ofa standard piece. of work or a term lot, which has to be clamped between the eeler pin and the grinding wheel. (onsequently it is impossible to grind any given piece of work to any desired predetermined size. This possibility is ailorded wi h the subject of the invention, inasmuch as the distance between the contacts can be adjusted with precision on the device itself, by means of micrometer screws, which carry the contacts and are fitted with gradiiated heads. This adjusting device can be applied both to the first contact, which influences the feed movement, and to the second contact, which sto s the machine altogether.
he drawing illustrates a typical example Specification of Letters Iatent.
Application filed November 18, 1908.
The. known devices ARBESTING THE FEED-MOTION IN GRINDING- MACHINES.
Patented May 4, 1909.
Serial No. 463,287.
of a device of this kind as a lateral elevation in partial section.
The bolt 1 is pressed by the spring 2 so that its outer terminal surface presses in a radial direction against the work. The sliding collar 3 is rigidly connected to the bolt 1 and moves in the bearing 4. At its other end tho holt 1 carries the how 5 which surrounds the two contact devices and is provided with a micrometer screw 8, together with the graduated head i] and pointer 10. By means of a small lever 11, which is supported against a nut 12 serving to tighten up the spring '2, the bolt can be drawn back from contact with the work. The whole device. is mounted on a slide-rest 14, '15 which gives a motion parallel to and at right angles with the. work.
At the commencement of grinding, the device may be set by the aid of the graduated head 9 and pointer 10, so as to give the interval S corres )onding to the desired coarse grinding, whi e the interval 5, corresponding to the desired iine grinding, can be set, if nec essary, by means of the graduated head 13. In the course of grinding, as soon as the bolt 1 has traversed the adjusted distances successively, in a radial direction, and the work has consequently attained the desired dimensions after the coarse and iine grinding, the contacts 6, 7 touch one another and thus stop the feed motion of the grinding wheel.
Now what i claim and desire to secure by Letters Patent is the following: 7
i. In a device for automatically arresting a feed motion, the combination of a longitudinally movable bolt; a spring for normally holding said bolt in contact with the work; a micrometer screw; connections between said screw and said bolt; and an electrical contact adapted to be controlled by said )ring through said connections, substantially as (lGSLI'ilJPLl.
2. in a device for automatically arresting a feed motion, the combination ol a longitudinally movable bolt; a spring for normally holding said bolt in contact with the work; a micrometer screw, the axis of which is longitudinally adjustable; (wnrncctions betwi-cn said screw and said bolt; and an electrical contact, one member of which is rigid with said axis, ada )ted to be controlled by said spring through said connections and independentl v through the adjustment of said screw, substantially as described.
3. In a device for automatically arresting feed motions, the combination of -a longitudinally movable bolt; a spring normally controlling the same; a nncron'ieter screw connected to said bolt; means for adjusting said 3 bolt longitudinally; an electrical contact controlled by said screw and adapted to be closed by said spring; and means permitting said bolt to be moved transversely, substantially as described.
4. In a device for automatically arresting feed motions, the combination of a longitudinally movable bolt; a spring normally controlling the same; means for adjustingthe tension of said spring; a micrometer screw connected to said bolt; means for adjusting said bolt longitudinally; an electrical contact controlled by said screw, one member of said contact being carried by said screw; said contact adapted to be closed by said spring, and independently closed by said screw; and means permitting said bolt to be moved transversely, substantially as described.
5. In a device for automatically arresting feed motions, the combination of a bolt; a spring controlling the motion thereof; a milcrometer screw; connections between said bolt and screw; an electrical contact adapted 1 to be closed by said spring; a second electrical contact; and a second micrometer screw controlling the same, substantially as described.
6. In a device for automatically arresting feed motions, the combination of a bolt; a spring for moving the same longitudinally; means to adjust the tension of said spring; a micrometer screw; connections between I I i i l FRIEDRICH SOHWERD.
Witnesses CARL Wninn, EMMA MARX.
said bolt and said screw; a second Inicro-
US46328708A 1908-11-18 1908-11-18 Device for automatically arresting the feed-motion in grinding-machines. Expired - Lifetime US920669A (en)

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