US781434A - Automatic sizing mechanism for grinding-machines. - Google Patents

Description

No; 781,484. PATENTED JAN. 31. 1905.

' A. B. LANDIS. AUTOMATIC SIZING MEGHANISM'FOR GRINDING MACHINES.

' APPLICATION FILED IAB. so, 1904.

' v4. sums-sum 1.

Witnesses fl 'No.'781,.434.- PATENTED JAN. 31, 1905.

- A. B. LANDIS.

AUTOMATIC.SIZINGIMBGHANISM FOR GRINDING MACHINES. APPI'IIOATIONVIILED In. so, 1904.

4 SHEETS-SHEET 2. v

Q I 1 flywonfoz witness Q fir PATENTEDJAN. 31, 1905. Y A. B. LANDIS.

AUTOMATIG- SIZING-MECHANISM- FOR GRINDING-MACHINES.

APPLICATION IILBD 111R. 30, 1904.

Ill l UNITED STATES Patented January 31, 1905.

PATENT OF ICE.

ABRAHAM B. LANDIS, OF wAYNEs oR o, PENNSYLVANIA.

AUTOMATIC SIZING MECHANISM FOR GRINDING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 781,434, dated January 31, 1905.

Application filed March 30, 1904. Serial No; 200,767.

aZZ whmn it may concern:

Be it known that I, ABRAHAM B. LANDIs, a citizen of the United States, residing at Waynesboro, in the county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Automatic Sizing Mechanism for Grinding-Machine's, of which the following is a specification.

The object'of my said invention is to provide an attachment for automatic feed mechanism for feeding the grinding-wheel of grinding-machines to the work of that general character shown in my former Letters Patents, Nos, 640,669 and 6541,3145, whereby the feed may continue until the exact size of the work desired has been reached and then be thrown out of operation. Inthe mechanism shown in said patents the wear-of the grinding-wheel in reducing the work to the size required is compensated for by turning back by hand the trip which throws the feeding mechanism out of operation.

My present invention is for doing this work by an automatically-control]ed electric mo v tor, all as will be hereinafter more fully depar-ts, Figure l is a rear elevation ,of a grinding-machine embodying my said invention;

, Fig. 2, a. cross-section'through said machine;

Fig. 3, a side elevation, on an enlarged scale,

' of the ratchet-wheel for actuating the feeding mechanism and the parts for operating said wheel automatically; Fig. 4, a side elevation, on an enlarged scale, of thesize-determining device; Fig. 5, a section through the same looking in the direction indicated by the arrows from thedott'ed line 5 5 in Fig. 6; Fig.-

6, a vertical section looking in the direction indicated by'the arrows from the dotted line 6 6 in Fig. 5, and Fig. 7a detail view showing the cam-wheel .16 in side and edge elevation.

In said drawings the portions marked A represent the bed of the machine;'B, the carriage; (l, the table; D, the slide, and E the grinding-wheel base. The frame A, carriage B, table (1, slide D, and grinding-wheel base E are all of a common and well-known con-' and arrangement to that shown in my other patents and is operated by a hand-wheel 1,

mounted upon a shaft 2, journaled in suitable hearings in a bracket on standard 3 on the top of said wheel-base; Saidshaft 2 is provided with a worm 70, which engages with a gear 71 on the top of avertical shaft 72, which is connected by suitable gearing to move the base E back and forth upon the slide D. Ratchetteeth are cut in the rim of. wheel 1, as shown in Fig. 1 and atthe left in Fig. 8, (a portion of ring 22 being broken away for this purpose,) which are adapted to be engaged, by a pawl 5, mounted in a socket in the vertical arm of a bell-crank lever 6, which is mounted on a pivot 7 on the lower end of a bracket 8,

attached to a part of standard 3 adjacent to said wheel 1. Said pawl 5 is adapted to slide in'said socket in arm 6, anda spring 9 is interposed between said pawl and the bottom of said socket to normally hold it into engagement with the rim of said wheel 1. An angle- .slot 10 is formed in one side of said arm, and

a transversely-projecting pin 11, mounted in oneside of pawl 5, projects therein. By this means the pawl is held square with its work,

and when it is desired to hold said pawl out of engagement with the rim of said wheel it may .be forced downwardly in said socket and turned so that pin 11 will pass beyond the vertical portion of said slot 10 into its horizontal portion, as will be readily understood. Pivoted to the horizontal arm of said bellcrank lever 6 is a weighted rod 12. having a screw 13 mounted in its lower end, which is adapted to engage with the horizontal plate 14. I

Said horizontal plate 14 extends transversely of the carriage and is mounted on a stem 15',

which extends downthrough a suitable verti- IOO cal bearing in said carriage and is provided l a micrometer-gage 40, mounted on the enter with a roller 16, eccentrically journaled on its lower end, which is formed with tapered sides adapted to travel in a groove 17 in the top of the bed A beneath said groove, provided with corresponding tapered sides, whereby sufficient friction is secured to rotate said roller and reciprocate said stem and plate 14 at the end of the travel of the carriage and through the connection 12 and the bell-crank lever 6 operate pawl 5 to feed wheel 1 forward one or more teeth. The length of the movement of said pawl 5 is regulated by the adjustment of the screw 13 in the lower end of weight 12 and by the adjustment of a setscrew 19, mounted in a suitable bearing behind the vertical arm of said lever and adapted to serve as a stop to limit the backward motion thereof, its position being secured by a jam-nut 21. By this means, as will be readily seen, the travel of the pawl 5 may be regulated as desired, so as to feed wheel 1 forward one, two, or more notches at each movement of the lever.

The rim 22'is mounted in a circumferential recess in one side of wheel 1 with its periphery flush with the points of the teeth and is adapted to turn thereon. A cam or trip 23 is set in one side of the periphery of said rim to project slightly therefrom. A transverselyextending pin 24 is mounted on one side of pawl 5 and extends across the path of said cam, which when brought to a position to reach the same will thus throw said pawl out of engagement with the wheel 1. A lever 25 is mounted on a pivot 26 on the side of said rim 22 and has a pawl 27 extending over the periphery of wheel 1 and adapted to engage with the teeth thereon. A spring 28 is connected with a projection on said leverat one end and at the other end to pin 29 on said rim at a point beyond. A thumb piece or lug 30 is formed on said rim adjacent to said lever. By pressing said lever 25 toward said thumbpiece 30 the pawl 27 will engage with the teeth of said wheel 1 and operate to force said rim back on said wheel to draw the trip 23 away from the position where it will contact with pin 24 in the side of pawl 5. Thus when the wheel 1 has been fed by the mechanism just described to the point for which it has been set and the trip 23 has reached a position where it will throw pawl 5 out of engagement if the work has not been ground to the size desired by reason of the wear of the grinding-wheel said trip is drawn back to permit the feeding operation to continue until the work is reduced to the size desired.

To this point the construction and operation of the mechanism is substantially the same as that shown in my aforementioned patent, No 640,669. In order'that the operation may continue until the work has been ground to the exact size without any care or attention from-the operator, I have provided end of a sleeve 41, having a rack-bar upon its inner end, which sleeve is mounted to slide in a horizontal bearing formed in one side of casing 42, which is mounted in a suitable support C on the top of table (J. A rod 43 is adjustably secured to the barrel of said gage by a set-screw s and its outer end adapted to rest against the work w, it being adjustably mounted to provide for different sizes of work. A pinion 44 is mounted upon a transverse shaft 45 in said casing and engages with the rack-bar on said sleeve 41. An arm 46, also mounted on shaft 45, has a segment-gear 4'7 on its opposite end, which engages with a pinion 48 in the rear of said casing. An arm 50 is mounted on said shaft 49 and extends forward and has a contact-head 51 on its forward end. A contact-spring 52 is mounted upon a bolt 53,-which projects through the side of the casing and is electrically connected to one wire 54 of the electric circuit. Said spring extends down to the lower side of the casing and at its lower end is formed curved and arranged with its face in position to be contacted by the head 51 of the arm 50 when it reaches this position. A sliding bar is mounted in one side of standard C and has a bracket 56 on its outer end containing a perforation'through which projects the outer end of rod 43, which thus serves to hold said rod stead yand prevent it from vibrating under contact with the work, as will be seen. The weight of arm 50 and its head 51, operating through the connecting-gear, serves to feed said rod 43 forward as the size of the work is reduced, keeping the end of said rod in close contact therewith. As the rod travels forward the head 51 of arm 50 will gradually pass from the position shown in whole lines in Fig. 5 until it contacts with the spring 52 near its lower end and moves on until it breaks contact therewith by passing beyond said lower end when it reaches the position shown in dotted lines, which will be when the work has reached the predetermined size.

A pair of electric magnets M and M are mounted on a suitable part of bracket 8 adjacent to the rim of wheel 1, being secured together by frame-pieces m and m, as shown. A plunger 60, having an antifriction-roller 61 upon its lower end in position to engage with a projecting arm 59 on lever 25, is mounted in bearings in said frame-pieces m and m between said magnets M and M and has an armature 62 secured to its outer end adjacent to and within the field of said magnets. A cell-battery B and B is mounted within the bed A on a bracket a, as shown. The wire 54 runs to said cell B, which is coupled to cell B and wire 57 runs from said cell B" to magnet M. The apertures in the frame through which said wires pass are lined with insulating material, as shown. A piece of insulating material 63, having a metal bar or staple 64: in itsouter edge, is secured on one cal armof bell-crank lever 6 upon each of its forward motions. It will thus be seen that while said bell-crank lever 6 is momentarily in contact with point 70 of arm 66 and said arms 65 and 66 are in contact with; bar 64, as shown in Fig. 3, a complete circuit through magnets M is established, which energizes said magnets and draws the armature 62in and spring'52 are in contact.

contact with their poles, which operates plunger to press roller 61 against the projecting arm 59 oflever 25 and operates said lever. to recede the rim 22 one notch in the same manner as when said lever is operated by hand against the projecting lug 30. v

The operation of the invention is as follows: The grinding operation'is begun and continued in the usual manner as shown and described in my former patents above referred to, and the automatic feed mechanism works mechanically, as described; until the wheel 1 has been revolved to bring the trip 23 into the position shown in Fig. 3, when it strikes the pin 24: in the side'of pawl 5 and would thus hold said pawl out of engagement with the point, however. the contact-bar 64: connects the arms and 66, and if the work has not 66, and through the machine back to'the bat-,

tery, when lever 6 is thrown forward against the contact-point 7 O in said arm 66. Thus at each motion of said lever 6 said circuit will be; closed, the magnets energ zed, and through the mechanism above described rim 22 will be drawn back one notch and trip 23 drawn out of engagement with the pawl, so that the pawl will continue to operate to feedwheel 1, and through it, the work, so long as arm 50 As soon as the work has reached the predetermined size for which said micrometer 'measure is set said head 51 of'arm 50 will pass over the end of spring 52', the electric circuit will be broken, 7 and the trip 23 will then hold pawl 5 out of. engagement with the periphery of said wheel Having thus fully described my said invent on, what I claim as new, and desire to secure by Letters Patent, -is

1. An automatic sizing mechanism for grind-,- lng-machinescomprising a feed-wheel having ratchet-teeth 1n its per1phery,,a rim mounted on said wheel having a pawl-lever adapted to engage with said teeth, a cam or trip mounted 1n the periphery of said rim to engage the .operating device-and throw it ,out of opera.-

tion,. and an electrically-operated plunger arranged to engage said pawl-lever and operate .it to turn back said rim and cam out of engagement with said operating 'device until the work has reached a predetermined size, sub-' .stantially as set forth.

2. In a grinding-machine, an indicator for automatically determining the size of .the work.

comprlsinga rod engagmg with said work .and ad ustably connected to a micrometer,

said micrometer being connected to mechanism which will break an-electric circuit at the point where the work has reached the predetermined size and stop the operation of the device, and mechanism connected with said. teeth in the periphery of wheel 1 and prevent i the further-operation of grinding. At this micrometer which breaks the electric circuit when the work has reached the size desired;

. rim for receding said cam from engagement with said main operating-pawl, electric magnets adjacent to said wheel, a plunger operated by the armature thereof adapted to contact with said pawl-lever, an electric circuit. connecting said magnets with the micrometergage, and mechanism connected with said mi-'- ,crometer-gage for breaking the circuit whenthe work has reached the-predetermined size, substantially as set forth. 1

I oo

5. An automatic sizingdevice for grindingmachines comprising a ratchet feed-wheelfor adjustably'mounted upon said wheel carry- .ing a cam for throwing said main pawl outof engagement when brought in contact thereside of said wheel and having a plunger connected with lts armature in position to contact with and operate said lever, the electric ,with, a pawl-lever for adjusting said rim upon sa1d wheel,a n electrlcmagnet mounted along- ISO circuit being arranged to be closed by the forward movement of said operating-pawl, a micrometer for determining the size of the work electrically connected in said circuit. and a circuitbreaking mechanism connected with said micrometer to break said circuit when the size of the work for which it is set has been reached, substantially as set forth.

6. In an automatic sizing device for grinding-machines, an electric circuit connecting the work-size indicator and the motor for receding the stop-feed ring, having a plurality of circuit-closers by which the farther advance of the reducing device is continued after the normal feeding for which it has been set has been reached, and a circuit-breaking device controlled by said indicator, by which said farther advance is arrested, substantially as set forth.

7. In an automatic sizing device for grinding-machines, a ratchet feed-wheel having a rim mounted thereon, a cam on said rim for throwing the driving-pawl out of engagement, a pawl-lever mounted on said rim for adjusting the same upon said wheel, and an electric motor for actuating said lever connected in an electric circuit forenergizing said motor and controlled by the work-size indicator, substantially as set forth.

8. In a grinding-machine, the combination of the automatic feeding mechanism for the grinding-wheel comprising a ratchet-wheel for operating the same, a main pawl engaging with said ratchet-wheel for operating the same, means for operating said pawl at each reversal of the motion of the carriage, an adjustable rim mounted on said wheel and carrying a cam for throwing the main pawl out of engagement at a predetermined point, a lever for operating said rim upon said wheel, a circuit-closing contact-bar also carried by said rim, electric magnets for operating a plunger for actuating said lever, contact-arms insulated from each other and mounted in position to contact with the contact-bar carried by said rim, one of said arms being connected with one of said magnets, the other of said magnets being connected with the contactpoint connected with the work-size indicator and the other of said arms being located adjacent to the main operating-pawl and in position to be contacted thereby to close the circuit at each motion of the pawl, substantially as set forth.

9. In a grinding-machine the combination of the slidably-adjustable rod secured in the micrometer-barrel and adapted to engage the work, said barrel being connected by a screwthread with a sleeve having a rack-bar thereon, a lever mounted on a spindle geared to said rack-bar and connected by a gear to another spindle bearing an arm adapted to engage with a contact-point while the grinding is progressing and pass from engagement therewith when the size of the work desired has been reached, and a feeding mechanism for the grinding-wheel electrically connected in the same circuit, whereby the feeding of the grinding-wheel to the work is regulated, substantially as set forth.

10. In a machine for reducing work, the combination with the mechanism for feeding the reducing-tool to said work, of a ratchet feed-wheel for operating said mechanism, a pawl operated by the travel of the carriage for operating said feed-wheel, a rim adjustably mounted on said feed-wheel provided with a cam to disengage the operatingpawl at a predetermined point electrically operated mechanism for receding said rim when it has reached said point controlled by the work-size indicator, said parts being electrically connected, and mechanism arranged to break the circuit when the work has reached the predetermined size whereby said cam will then hold the operating-pawl out of engagement with said feed-wheel, substantially as set forth.

11. In a grinding-machine, the combination of the mechanism for feeding the grindingwheel to the work, a feed-wheel for operating said mechanism provided with ratchet-teeth in its periphery, a reciprocating pawl operated by the travel of the carriage for actuating said feed-wheel, a rim adjustably mounted on said feed-wheel and provided with a cam arranged to disengage said operatingpawl when the wheel has been fed to bring said cam into engagement therewith, a device for receding said rim upon said wheel, electricallyoperated mechanism for actuating said device, an intermittent circuit closer and breaker controlled by the operatingmawl, and a permanent circuitbreaker controlled by the size-indicator (which is connected in the same electric circuit) when the work has reached the predetermined size, substantially as set forth.

12. Inagrinding-machine, the combination of the feeding mechanism for feeding the grinding-wheel to the work, a ratchet feedwheel for operating the same, a pawl mounted to be actuated by the travel of the carriage for operating said feed-wheel, an arm adjustably mounted on said wheel having a cam for throwing said pawl out of engagement with said feed-wheel, a pawl-lever pivoted thereto for moving said rim step by step, an electric magnet mounted alongside of said wheel and having a plunger connected with its armature and arranged to operate said lever when said magnet is energized, terminals of the two branches of the circuit arranged in proximity to said wheel, a contact-bar in the periphery of said ring arranged to connect said terminals when the cam reaches the point where it will contact with the operating-pawl, one of said terminals having'its opposite end in position to be contacted by the pawl upon its forward motions whereby the circuit is closed by each forward motion of said pawl, and broken by its receding motion, a work-size indicator electrically connected in the same circuit embodying mechanism which breaks said circuit when the work reaches the predetermined size, substantially as set forth;

13. In a grinding-machine, the combination of the mechanism for feeding the grindingwheel to the work, a ratchet-wheel for operating said mechanism, a pawl for operating said ratchet-wheel, a trip for throwing said pawl out of operation at a predetermined point, an electrically-operated device for recedingsaid trip'to allow said pawl to continue to advance said wheel, a work-size indicator connected in the same electric circuit and embodying mechanism arranged to break said circuit when the work reaches the predetermined size, substantially as set forth., 7 I I 14. In a grinding-machine, the combination of a work-size indicator comprising a sliding rod arranged to be held against the work, gearing connecting said rod with a traveling contact point or head, a second contact-pointof a length to allow for the travel of said first contact-point in contact therewith until the work has reached the predetermined-size when it will pass therefrom and break the contact, an electric circuit connected with said second contact point on the grindingwheel feed mechanism, mechanism for automatically operating the same, an electric device for continuing said mechanism in operation until the work has been reduced to the predetermined size, said mechanism being controlled by said work-size indicator, substantially as set forth.

15. An automatic sizing device comprising an indicator bearing upon the work, a device for prolonging the feed of the reducing-tool until the predetermined size of the work has been reached, an electric motor for operating said device, an electric circuit connectingsaid indicator and motor embodying a plurality of circuit-closing points, whereby the feed is continued intermittingly until the predetermined size of the work has been reached and then permanently stopped, substantially as set forth.

16. In an automatic sizing device for grinding-machines, the combination of the indicator arranged to be adjusted to various sizes'of chine and stopped mechanically, a feed-prolonging mechanism operated by an electromagnet, by which the mechanical or power feed is madeto proceed until the electric circuit is broken, an electric circuit having a plu-' rality of circuifibreaking points bywhic'h the circuit at anytime is only momentarily closed, and a size controlling device which finally breaks the circuit when the predetermined of the work has been 1'cached,'said circuit having three points of opening and closing by which the circuitis only momentarily closed at any time and only onewhen nearing the predetermined size of the work, substantially as set forth.

19. In an automatic sizing mechanism for grinding-machines, a ratchet feed-wheel having a receding pawl, disengaging mechanism, an electromagnet for receding said disengaging mechanism, said electromagnet being connected in a circuit with a device controlled by' the size of the work to break the circuit when the predetermined size of said work has been reached, substantially as set forth.

' '20. In an'automatic sizing" mechanism, an automatic feeding mechanism operated'mechanically by power from the machine, an automatic stop to stop the feed by mechanical action, and an electricallycontrolled feedstop receding device, substantially as set forth.

' 21. In an automatic sizing device, an automatic feed mechanism operated mechanically and stopped mechanically, a feed-extending device operated by anelectromagnet, by which the mechanical power-feed is allowed to proceed until the electric circuit'is broken by a size-controlling device when the predetermined size has been reached, substantially as set forth. i

' In witness whereof I have hereunto set my hand and seal, atWaynesboro, Pennsylvania, this 14th day of March, A. D. 1904.

ABRAHAM B. LANDIS.

Witnesses:

MERTA RUSSELL, ALF. N. RUssELL.

Images