US2284257A - Device for feeding rods or tubes in grinding machines or the like - Google Patents

Description

May 26, 1942. J. E. BERGSTRUM DEVICE FOR FEEDING RO DS OR TUBES IN GRINDING MACHINES OR THE LIKE Filed Dec. 21, 1939 3 Sheets-Sheet l Dmvenibam- JOHN ERIK BERGSTRUM I by 01 M y 6,-1 .1. E. BERGSTROM 2,234,257

DEVICE FOR FEEDING RODS OR TUBES IN GRINDING MACHINES OR THE LIKE Filed Dec. 21, 1939 3 Sheets-Sheet 2 \nvc row IOHN ER\K BERGSTROM arrmen May 26, 1942. J., E. B ERGSTRUM 2,234,257

DEVICE FQR FEEDING RODS OR TUBES IN GRINDING MACHINES OR THE LIKE Filed Dec. 21, 1959 :5 Sheets-Sheet 5 JOHN ERIK BERG5TR 5M I I I a Patented 2 6, 1942i. 5 v I DEVICE FOR FEEDING RODS OR TUBES IN I GRINDING MACHINES OR THE LIKE John Erik Bergstrom, Halinstad, Sweden Application December 21, 1939, Serial No. 310,374

In Sweden March 4,1939

s Claims. --(o1. 51%236) When grinding long rods or tubes it is necessary to use a supporting channel or a so-called feeding table. For small dimensions 'up'to about '15 mm. it issufficient to use a supporting channel that is displacea'ble in the vertical direction and provided with movable or adjustable guiding strips for the work;

As soon as larger dimensions are to be ground, a simple supporting channel is no'longer sufficient, and other and more eflicient means must then be used. Obliquely adjustable rollers have been used;'between which the rods or tubes have been supported. 'lfhe rollers run on ball-bearings,

and the oblique adjustment of the rollers is eflfected tofacilitate the feeding of the rods.

The above described auxiliary feeding devices are, however, connectedwith-the great disadvantage that only comparatively thin rods'may be led in centreless grinding machines depending on the pulling force of the feed roller or regulating wheel used in'su'ch machines. To make possible a good and eflicient feed of the rods one has used electrically operated feeding tables,

in which obliquely adjustable supporting rollers arranged in pairs have been driven by an electric motor, the workresting in the gap between the supporting rollers being arranged in pairs. Such a support for the rods has the disadvantage that a certain bending action-is eifec'ted between the rollers, which action may become u so strong that a spiral-formed mark in the form rollers right below the work, they may be obliquely adjustedat'any time during the opera- 'tion,"the rate'of feed 'beingthere'by adjustable from nought to a maximum,jand,-furthermore,-

the direction of feed of .thework may be reversed forth'and back depending on whether the drive rollers "are obliquely adjusted to the one or the other side in relation to the work.

An'embodiment of the invention is illustrated on the accompanying drawings.

Fig. 1 shows a side elevation'view of a feeding table arranged according to the invention.

Fig. 2 shows a vertical cross-sectionof the same taken along the line 11-111 in Fig. 1.

Fig. 3 shows a vertical longitudinal section through the end portion .of the table farthest away from the grinding'machine and taken in the plane III-III in Fig. 2. r v

'Fig. 4 shows a vertical cross section along the line -IV-IV in Fig: 3;

of a shadow may be-observed onthe rod after I the grinding.

Furthermore these-known feeding tables have the disadvantage that the rate-0f feed cannot be adjusted-or changed as desired without making necessary an intricate and expensive electric regulating device, and they cannot be run both back and forth.

The present invention has for its object to develop afee'ding table for grinding machines, particularly centreless grinding machines in which the rate of feed is'adjustable in a very simple manner, and wherein the direction of feed may be reversed, and in which all of the above mentioned disadvantages are eliminated.

In the feeding tableaccording to the invention as in the knowntabl'es, rotary rollers supporting the'work are used, the axes of which rollers are obliquely adjustable in relation to the work for the purpose of facilitating or eifecting a feed of the work, but according to the invention the said supporting rollers are arranged singly on a line one after another and support the work at or in the neighborhood of-the high- In Figs. 1 and 2,1 designates a feeding table which is supported by the twostandards 2 and 3 so as to be elevated orlowered. aindicates in Fig. 1 the bed of a centreless grinding machine. The standards Z and "3 each support a cylinder 4 in which a piston 5 supporting the table |:is fitted. Thepis'ton 5 iscarried by a vertical rod6 beingsecured to a transverse wall I in the piston.

The lower portion 8 of the rod; is threaded and screwed axially into a bevel gear Sthat is rotatably journalled in a transverse yoke or bar 10 being a part of the standards 2 and 3 respectively. The two bevel gears 9 in the standards 2 and 3 are each in mesh with a bevelgear H, which ears are attached on a horizontal shaft I2 that extends between the two standards 2 and 3. On the shaft l2 a hand wheel I 3 is secured. By turning the hand wheel in the one or the other direction the rods 8, pistons 5 and the table I are raised or lowered. The table may be safely secured on the adjusted level thereby that the cylinders 4 on top are provided with a cut out slit I l so that the cylinders may be resiliently contracted on top by means of a screw 1-5 be'ing'threaded into the boss [-5 so that the cylinder with sufficient friction will enclose the piston to secure the same in position.

The standard 2 differs from the standard 3 therein that in the upper portion of the standard the grinding machine. In Fig. 1 the table I occupies the limit position closest to the grinding machine. 7

2| designates a cylindrical rod that is being fed cured on the shaft 24 by means of the pin 60, whereas the clutch member 48 is displaceable along the shaft 24 within certain limits, for which purpose a pin 5| secured to the member 48 is passed through an oblong hole 52 in the shaft 24. Between the clutch member 48 and a nut 53 threaded on the shaft 2. spring 54 is arranged, the tension of which spring presses the clutch member48 towards the friction member 46 and the latter in its turn against the clutch member 49. By turning the nut 53 which may be locked by the locking nut 55, the said tension may be varied and adjusted so that a desired sliding. may be obtained in the friction clutch.

by the feeding table in the direction toward the 4 a grinding machine. number 'of drive rollers and journalled on the top side of the table, which rollers are so adapted that the rod will rest on the highest or in the neighbourhood of the highestpoint of, the drive rollers. The drive rollers 22 are, driven by a common shaft 24 running along. the table. Further, the work 2| is sustained by side bearing rollers 23 that, although parallel with the shaft 24 on opposite sides of the same. When the arms 25 have been turned to The rod 2| is supported by a' 22 arranged in alignment the desired position depending on the diameter of the work, the arms 25 are secured on the rods 26 which may be effected thereby that the hubs of the arms are slit open at 28 and may be clamped on the rods 26 by tightening a screw 29. The rods 26 are supported by brackets 30 secured on the top side of 'the table. 7

The rods 26 may be secured bya clamping device (not shown) similar to the device 21, 28, 29 and secured to or integral with one of the brackets 30. By loosening the clamping device of the rods 26, the latter may be turned.

Thereby the positions of the side supporting rollers 23 on one or both of the rods 26 may be adjusted simultaneously to suit the position of the regulating wheel of a centreless grinding'machine in relation to the work. This is of great importance, since it gives a possibility of readily adjusting the position of the work to the one or the other side of the highest pointsof the drive rollers 22 to bring the work to the correct position on the feeding table in relation to the regulating wheel and the grinding wheel.

Only the drive rollers 22, on the tops of which the work is resting, may be mechanically driven.

g The end of the shaft 24 is, as indicated, journalled in a bracket 56 secured to the feeding table.

' From the shaft 24 the drive power is transmitted to the drive rollers 22 by the following means. The drive roller 22 is secured to a sleeve 51 enclosing the shaft 24. On the inside said sleeve is provided with an'annular shoulder 58 or a pair. of projections arranged diametrically oppositeone another, the face of said shoulder or said projectionsturned-towards the shaft 24 being cylindrical or spherical and abutting against a'ring 59 secured on the shaft 24. Through the shaft 24 and the ring 59 a pin 60 is passed, the

'endsof which engage bores in the shoulder or projections 58 so that, when the shaft 24 is rotated, the pin brings the sleeve 51 and thus also the drive roller 22 along in the rotation,

By means of the described mounting of the sleeve 51 on the shaft 24 it is possible to position the axis of the drive roller 22 obliquely in relation to the shaft 24. In doing so the sleeve is pivoted aboutthe ends of the pin 6|) in a plane through the centreline of the shaft 24 perpendicular to the drawings. Thereby the axis of the drive roller will beobliquely positioned also in relationtothe'centre line of the work so that the frictional force acting between the drive roller and the work will obtain a component in Their driving means is illustrated in Figs, 3 and 4. Their driving shaft 24 is driven by the motor 3|, the housing of which is secured to the flange 32 on the feeding table farthest tothe right in Fig. 1. From the motor shaft 33 the drive power is transmitted by means of the gears-34, 35 to the shaft 36 and from thereby means of the worm gearing 31, 38 to the shaft 39 which by means of the gears 46,4! drives the shaft 42 on which a second gear 43 (Fig. 3) is secured and in mesh with teeth 44 provided on the circumference of a friction member 45 which is loosely mounted on the shaft 24 so that it may be rotated about as well as. displaced along the shaft 24. Thetwo end portions 46, 41 of the friction member 45 are bevelled and cooperate with corresponding bevelled surfaces of two clutch members 48 and 49 respectively. The clutch member 49 is rigidly sethe longitudinal direction of the work, which component will exert a feeding action on the work in the same way as in centreless grinding machines when the regulating wheel is obliquely positioned in relation to the work.

The drive roller 22 is mounted on a needle bearing 6|, the needles being arranged between the sleeve 51'and an outer bearing ring 62 which engages inside a cylindrical flange 63 on the drive roller. The ring 62 is enclosed and carried by an anular-bracket 64 projecting upwards from a disc 65 mounted on the feeding table. The disc .65 isprovided with a vertical pivot pin66 being journalled in the indicated way in the feeding table. In one of the drive rollers 22 the lower end 61 of the pivot pin 66 is passed through a toothed segment 68 being clamped on the pivot end'6l by means of a nut 69 so that the toothed segment cannot turn on the pivot pin (Fig. 2). The teeth 69 ofthe toothed segment 68 are in mesh with teeth 10 being cut in the end of a vertical rod "II beingrotatably journalled in the feeding tableand providedwith a handle 12 for turning the sameiFigs. land 2)." The toothed portion of the toothed segment '68 protrudes through a-slot 13 in the side wall of the feeding table. Thetoothed-segment 68 supports a die "through which a'regulating rod15 is passed and secured to the same, said regulating rod being extended in. the longitudinal direction of the feeding table and connected to levers (not 68 are secured in a similar way to the pivot pin 61 of the other drive rollers.

When the handle 12 is turned, the toothed segment 68 is turned and thus also the pivot pin 66 on which the toothed segment is non-rotatably attached. The regulating rod I transmits this motion to the pivot pins 66 of the other drive rollers so that all the pivot pins are turned simultaneously and equal amounts. Thereby the discs 65 (Fig. 3) and the annular bracket 64 are turned about the centre line of the pivot pin 66. The bracket 64 will thus turn the drive roller 22 and the sleeve 51 about the pin 60 by means of the bearing ring 62, the pin 60 being coaxial with the pivot pin 66. Thereby the drive rollers will occupy the same oblique position in relation to the shaft 24 and the work 2|.

By the above described feeding device the advantage is also reached in connection with centreless grinding machines that the work may be given the same rate of feed and peripheral velocity as the feed roller or regulating wheel of the grinding machine has or is giving to the work. Th side bearing rollers 23 may, if desired, also be made obliquely adjustable in relation to the work in order to make the least possible resistance to the feeding of the work.

The above described feeding table withaccessories is placed, on the feeding side of the grinding machine and also on the delivery side of the same to receive and feed out the ready ground work.

Having now particularly described the nature of my invention and the manner of its operation what I claim is: V

1. Feeding table for feeding rods or tubes in grinding machines comprising a table arranged at the side of the grinding machine, a number of single rotary supporting rollers mounted on said table in alignment with each other and adapted to support the work in the proximity of the highest points of said supporting rollers, a number of side bearing rollers being freely rotatably mounted on said table and adapted to abut against the work and to maintain the position of the latter on top of said supporting rollers, a longitudinal straight and undivided common drive shaft for said supporting rollers passing centrally through bores in said supporting rollers, means for rotating said drive shaft, means for transmitting the rotary motion of the drive shaft to said supporting rollers, means for supporting and freely rotatably journalling said supporting rollers independently of said drive shaft about axes, being perpendicular to the drive shaft, and a common regulating rod intercon-.-

necting' said supporting rollers and adapted to turn them simultaneously, even during the grinding operation, about said axes to'oblique positions in relation to the work.

2. Feeding table for feeding rods or tubes in grinding machines comprising a table arranged at the side of the grinding machine, a number.

of the drive shaft to said supporting rollers,v

standards displaceably supporting the'feeding table, means for displacing the feeding table in the vertical direction in relation to said standards to adjustthe level of the supporting rollers for works of different diameters, a set of side bearing rollers being freely rotatably mounted on the feeding table on each side of the work and adapted to abut against the work and to maintain the position of the latter on top of said supporting rollers, said side bearing rollers being pivotally mounted on arms, which on each side of the work are mounted on a common longitudinal rod to be adjustable simultaneously in the transverse direction of the work to suit different sizes of the work.

3.Feeding table for feeding rods or tubes in' grinding machines comprising a table arranged at the side of the grinding machine, a number of single rotary supporting rollers mounted on said table in alignment with each other and adapted to support the Work in the proximityof the highest points of said supporting rollers, a

pendently of said drive shaft about pivot axes being perpendicular to said drive shaft, means for turning said supporting rollers'about said pivot axes to oblique positions in relation to the work even during the grinding operation, each supporting roller being rotated by said drive shaft by means of a pin device arranged and acting in a plane going substantially through said pivot axis and adapted to allow said turning of said supporting rollers about said pivot axes independently of the drive shaft.

JOHN ERIK BERGSTRDM.

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