US1974696A

US1974696A - Grinding machine

Info

Publication number: US1974696A
Application number: US418073A
Authority: US
Inventors: Oscar A Swanson
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-01-02
Filing date: 1930-01-02
Publication date: 1934-09-25
Anticipated expiration: 1951-09-25

Description

Sept. 25, 1934. o, A, SWANSON GRINDING MACHINE Filed Jan. 2, 1930 4 Sheets-Sheet l 92 fiat 2a.

R. S. m H m M OVV m a M A vi a. n M 7 Q Y. 0 a: B 7 9 o 7 M; a A! %%%9% Se t. 25, 1934. o. A. SWANSON 1,974,696

GRINDING MACHINE Filed Jan. 2, 1930 4 Sheets-Sheet 2 INVENTOR.

BY wgfM/ A TTORNEYS.

Sept. 25, 1934.

O. A. SWANSON GRINDING MACHINE Filed Jan. 2, 1930 4 Sheets-Sheet 5 IN VEN TOR.

ATTORNEYS.

Sept. 25, 1934. o. A. SWANSON GRINDING MACHINE Filed Jan. 2, 1930 4 Sheets-Sheet 4 LLAN VENTOR. L d/cam WVLQKM/ I A TTORNEYS.

Patented Sept. 25, v1934 PATENT OFFICE GRINDING MACHINE Oscar A. Swanson, Erie, Pa.

Application January 2,

19 Claims.

In grinding round articles, difficulty is experienced in properly presenting the work to the grinding wheel. Such articles are usually rotated by engaging the ends of the article so as to rotate the work presenting the annular surface to be ground. 1 The engagement and disengagement of such driving mechanism takes time and complicates the mechanism. This is particularly true with relation to mechanisms which automatically deliver and discharge the work. It also presents difficulties with relation to such devices, as wringer rolls, in which it is desirable to grind the entire rubber surface centered on a metal shaft to which the rubber is attached and in the present example of the invention and which has the preferred embodiment the apparatus is so designed as to automatically receive, grind and discharge wringer rolls. In carrying out the invention the mechanism is very much simplified by driving the work, in this instance the wringer roll, by frictionally engaging the surface of the roll itself, preferably directly opposite the point of engagement with the grinding wheel. This avoids the necessity of chucks and gripping mechanism engaging and disengaging the extending shafts together with the requisite rotative driving mechanism for such engaging mechanism. Features and details of the invention will appear from the specification and claims.

A preferred embodiment of the invention is illustrated in the accompanying drawingsas follows:

Fig. 1 shows a side of the device.

Fig. -2 a section on the line 2-'-2 in Fig. 1.

Fig. 2a an elevation of the mechanism show in Fig. 1.

Fig. 3 a section on the line 3-3 in Fig. 1.

Fig. 4 a section on the line 4-4 in Fig, 1.

Fig. 5 a development of the cam advancing and retracting the grinding wheel.

Fig. 6 a section on the'line 6-6 in Fig. 3.

Fig. 7 a-sectiori on the line '7--'7 in Fig. 3.

Fig. 8 a side elevation of the driving mechanism for the driving roll.

Fig. 9 a section on the line 9=--9 in Fig. 1.

Fig. 10 an enlarged view of one of the carriers.

.1 marks a machine frame which is carried by a base 2. A grinding wheel 3 is mounted on a shaft 4 and the shaft 4 is journaled in bearings 5 on the frame of the machine. It is driven by a pulley 6 from any convenient source of power. The journals 5 are carried on a frame 7 and this frame has a base 8 with an undercut groove 9 slidingly engaging dove-tailed shoulders 10 of a sliding support 11. The sliding support likewise has an 1930, Serial No. 418,073

undercut groove 12 slidingly mounted on a dovetailed shoulder 13 on the frame. A base 8 may be adjusted on the sliding support by means of a screw 14 and locked in adjustment by screws 15. The grinding wheel is carried by and retracted from the work by the following mechanism: A cam roller 16 is secured on the underside of the sliding support and operates in a cam groove 1'7. The cam groove is formed in a wheel 18 fixed on a shaft 19. The shaft 19 is journaled in bearings 20 on the frame. It is driven through a spiral gear 21 from a spiral gear 22. The spiral gear 22 is fixed on a shaft 23. The shaft 23 is journaled in bearings 24 on the frame. A sprocket wheel 25 is fixed on the shaft 23 and is connected by a ehain'26 with a sprocket wheel 27. The sprocket wheel 2'7 is fixed on a shaft 28. The shaft 28 is journaled in bearings 29 on the frame and is driven through a pulley 30 receiving its power from any convenient source. The cam groove 17 is developed in a drawing shown in Fig. 5. It simply advances the wheel to the grinding position and holds it there through the greater part of the cycle and then retracts it to.a definitedistance holding it retracted for a slight period and then advancing the wheel. It is also desirable to reciprocate the grinding wheel slightly axially in order to assure a uniform surface on the work. This is accomplished in the present mechanism as follows:A sprocket wheel 31 is fixed on the shaft 19. A chain 32 extends from this sprocket wheel to a sprocket wheel 33. The sprocket 33 is fixed on a shaft 34. The shaft 34 is journaled in brackets 35 extending from the frame. A cam wheel 86 is fixed on the shaft 34 and is provided with a' cam slot 37 A cam wheel 38 extends into'the slot and the cam wheel is carried by a rock arm 39. The rock arm is carried by a shaft 40 journaled in a bracket 41 extending from the frame. The rock arm 39 has a fork 42 at its upper end with rollers 43 in each arm of the fork, which rollers engage ball bearing shoulders 44. In this way the grinding wheel is given the necessary axial movement to assure uniform grinding. The work -is received and presented to the grinding wheel by an automaticallyactuated carrier which is arranged as follows: Carrier discs 45 are mounted on a shaft 46, which shaft is journaled in bearings 46a on the frame. The discs are made up of the side plates 47 having an intervening spacer plate 47a. The discs have slots 48 adapted to receive wringer roll shafts 49a of wringer rolls 49. These slots have rollers 50 and 51 which are journaled on

pins

50a and 51a extending between the plates. A movable roller 52 is mounted on an arm 53. The arm 53 is mounted on a rock shaft 54 journaled in the disc, the arm being arranged between the discs. An arm 55 is secured to the rock shaft 54 at the outer face of the disc. The rock arm has a cam roller 56 which rides a cam 57. The cam 5'7 has a depression 58 which permits the rock arm to swing forward and bring the roller 52 into engagement with a roll shaft, as clearly shown at the left of Fig. 6. A spring 59 swings the arm 53 when the roller reaches the depression 58. In order to give rigidity, however, to the rollers 52 and consequently to the bearing formed by the

rollers

50, 51 and 52 carrying the wringer shaft the arm 53 is positively locked when the roller reaches the grinding position. The roller 56 moves against a lip 60 on a plate 61, the plate 61 being secured to the cam 5'7. The lip positively holds the roller in engagement with the cam surface in the depression 58 and thus holds the rollers in a fixed position during the grinding operation. The arm 53 as it is advanced passes out from under the lip 60 and reaches the end of the depression where a cam surface 62 moves the arm 53 so as to swing the roller 52 clear of the wringer roll shaft so as to discharge the wringer roll. A driving roll 63, preferably formed of rubber, engages the wringer roll at a point preferably directly opposite the point of engagement of the grindingwheel. The driving roll 63 is mounted on a shaft 64 journaled in bearings 65 on brackets 66 extending from a plate 6'7. The plate 6'7 has an undercut groove 68 slidingly engaging dove-tailed shoulders 69 on the frame. The plate 6'7 has slots '70 through which locking screws '71 extend. Screws '72 extend through a plate '73 secured on the plate 67. The screws 72 permit of a nice adjustment of the plate 6'7. A spring '74 operates on the plate '73 and tends to force it forward against the action of the screw 72. A driving wheel '75 is fixed on the shaft 64 and is driven by a belt '76 from a pulley '77. The pulley '77 is fixed on a shaft 78 and the shaft '78 is journaled in bearings 79 mounted on the plate 6'7. A pulley 80 is also fixed on the shaft and is driven from any convenient source of power, thus delivering the necessary action to the driving roll 63.

It will be noted that the roller 63 is slightly shorter than the roll. It ordinarily would be as short as the shortest roll and one of the carriers, the one at the right in Fig. 3, is adjusted axially on the shaft 46 so as to adjust it to different lengths of wringer rolls. The cam 57 at that side of the machine is also adjustable with the carrier and is locked in adjustment and against turning by a pin 81 which extends through the frame and is locked in adjustment by a set screw 82 extending through a boss 83 on the the grinding position the following mechanism is provided: It comprises what is ordinarily termed a Geneva movement and has. the driven wheel 84 with a series of slots 85 corresponding in number to the slots 4'7 on the carrier. This driven wheel. also has concave locking surfaces 86. A roller 8'7 is mounted on a drive wheel 88 and enters a slot 85 with each rotation of the wheel 88, advancing the wheel 84 the distance between the slots, thus bringing a new roller in a slot 48 to the grinding position. The wheel 88 has the curved projections 88a engaging the concave surfaces 86 0f the wheel 84, thus locking the wheel 84 through the intermediate travel of the wheel 88,

the curve 88a being broken at 88?) to permit the forward movement of the wheel 84. A positive lock or positioning device is also provided for the wheel 84. The ends of the slots 85 are flared at 89 and a latch 90 having a beveled end 91 is moved forward into the slot locking it in each successive position. The latch operates in a guide 92 carried by a plate 92a secured to the side of the frame. It has an extension 93 which projects into a pocket 94. A spring 95 operates against the end of the extension and is seated on a plug 96 in the end of the pocket. The spring yieldingly forces the latch forward into locking position. The latch has a notch 97 which is engaged by a rock arm 97a. The rock arm is mounted on a pin 98 extending from the plate 92a. The opposite end of the rock arm is provided with a roller 99 which rides a cam surface 100 on the wheel 88. This cam surface has a lift portion 101 and when the lift portion engages the roller 99 the latch is retracted so as to permit of the movement of the wheel 84 and with it the work carrier. It will be noted that the latch 90 does not extend out to the outer face of the wheel 84, thus allowing clearance for the wheel 88 past the latch 90.

The wringer rolls are fed to the carrier from a magazine. This is mounted on a frame projection 102. The magazine is formed of spaced rails 103 at one side of the machine and secured to the upright 102 by a bracket 104. At the opposite side of the machine guide supports 105 are secured to the upright 102 and rails 106 similar to the rails 103 are adjustably secured to the guide supports by adjustable plates 107. Thus the guide supports at this side. of the machine may be adjusted inwardly and outwardly to accommodate different lengths of rolls. The rolls are inserted at the end of the inclined guide plates, as clearly indicated in Fig. l and pass down by gravity. As a roll is carried out from under the guides by the advance of the carrier the peripheral surface of the carrier supports the next succeeding roll until a new slot 48 is brought under the roll thus supported when this roll drops into the slot in the carrier and in this position supports the other rolls above it. It will be understood that the guide preferably terminates directly above the position assumed by a slot 48 just at the next stop preceding the grinding position. A series of rollers 108 are mounted in plates 109. The plates 109 have a slight inclination so that when the wringer rolls drop upon them as discharged from the carrier they roll out at the side of the machine and are thus ultimately discharged.

It will thus be seen that in this machine the rolls are simply placed in the magazine, are received one by one by the carrier, are automatically advanced by the carrier to the grinding position, are driven through the direct frictional engagement of the roll by a driving roll and are at the same time engaged and ground by a grinding wheel which is automatically advanced and retracted as each roll is presented 1 to it, and that the rolls at the completion of the grinding operation are discharged from the carrier and carried out of the machine; that the carrier can, under these circumstances be made of a very simple form, merely providing means for receiving and journaling the wringer roll shafts; that no automatic driving chucks, or gripping mechanisms on these shafts are required as the rotative movement of the roll is accomplished through the direct gagement on the roll itself.

It will be noted that .the driving wheel 63 has such engagement with the roller being ground that it retains the wringer roll as against the endwise thrust incident to the reciprocation of the grinding wheel.

What is claimed as new is:--

1. In a grinding machine, the combination of a grinding wheel; a pair of work supports, each having a plurality of rollers one of which is movable to receive the work; means automtically moving the movable roll to open and close the support; and a work driver rotating the work by frictional engagement with the work surface.

2. In a grinding machine, the combination of a grinding wheel; a carrier having a plurality of work supports, each work support comprising a plurality of rollers; one of which is movable; means for advancing the carrier to bring the supports successively to grinding relation; means for moving the movable support to open and close frictional en- .the support for receiving and discharging the work; and a work driver rotating the work by frictional engagement with the work surface.

, 3. In a grinding machine, the combination of a grinding wheel; a work support in which the work is rotatably mounted on an axis fixed relatively to the support and held in grinding relation to the wheel, said wheel having a length equal to the length of the work; means for reciprocating the wheel axially; and a work driver rotating the work by frictional engagement with the work surface subjected to the grinding action.

4. In a grinding machine, the combination of a grinding wheel; work supports, each having a series of rolls, one of which is movable, and adapted to engage the metal shaft of a rubber roll to support the same in grinding relation with the wheel; and a driver rotating the work by frictional engagement with the surface.

5. In a grinding machine, the combination of a grinding wheel; a carrier having a plurality of supports, each support comprising a plurality of rolls, one of which is movable, said supports being adapted to engage the metal shaft of a rubber roll and hold the same rotatably in grinding relation with the wheel; means for advancing the carrier to advance the work into grinding 150i relation; means operating frictionally on the work surface for rotating the work on its axis; and means moving the movable roll to receive and discharge a roll.

6. In a grinding machine, the combination of a grinding wheel; a work support in which the work is rotatably mounted and held in grinding relation with the wheel; means for opening and closing the support, said support being adapted to support a wringer roll by engagement with the wringer roll shaft; means driving an inserted wringer roll rotatively on its axis by frictional engagement with the work surface; a magazine A holding a plurality of wringer rolls; and means for automatically opening and closing the support to receive rolls from the magazine and discharge the same from the support.

'7. In a grinding machine, the combination of ,a grinding wheel; a work support in which the work is rotatably mounted and held in grinding,

relation with the wheel; means for opening and closing the support, said support being adapted to support a wringer roll by engagement with the wringer roll shaft; means driving an inserted wringer roll rotatively on its axis by frictional engagement with the work surface; a magazine holding a plurality of wringer rolls; means for automatically opening and closing the support to receive rolls from the magazine and discharge the same from the support; and means for conveying the rolls from the machine.

8. In a grinding machine, the combination of a grinding wheel; a work support in which the work is rotatively mounted at both ends and positively secured by engagement of parts separated from the surfaces to be ground on an axis fixed relatively to the support and held in grinding relation to the wheel; a rotating friction wheel rotating the Work by frictionally engaging the work surface; and means automatically delivering the work to the support.

9. In a grinding machine, the combination of agrinding wheel; a work support in which the work is rotatively mounted at both ends and positively secured by engagement of exterior surfaces of parts of the work separated from the surfaces to be ground on an axis fixed relatively to the support and held in grinding relation to the wheel; a rotating friction wheel rotating the work by frictionally engaging the work surface; and means discharging the work therefrom.

10. In a grinding machine, the combination of a grinding wheel; a work support in which the work is rotatively mounted at both ends and positively secured by engagement of parts separated from the surfaces to be ground on an axis fixed relatively to the support and held in grinding relation to the wheel; a rotating friction wheel rotating the work by frictionally engaging the work surface; means automatically delivering the work to the support; and means discharging the work therefrom.

11. In a grinding machine, the combination of a grinding wheel; a carrier having a plurality of work supports in which the work is rotatively mounted at both ends and positively secured by engagement of exterior surfaces of parts of the work separated from the surfaces to be ground and on which the work is rotatively mounted on an axis fixed relatively to the support; means acting on the carrier advancing the supports to and retarding them at the grinding position with relation to the wheel; and a rotating work driver rotating the work by frictional engagement with the work surface subjected to grinding.

12. In a grinding machine, the combination of l a grinding wheel; a carrier having a plurality of work supports in which the work is rotatively mounted at both ends and positively secured by engagement of parts separated from the surfaces to be ground and on which the work is rotatively mounted on an axis fixed relatively to the support; means acting on the carrier advancing the supports to and retarding them at the grinding position with relation to the wheel; a rotating work driver rotating the work by frictional engagement with the work surface subjected to grinding; and means automatically delivering the work to the supports.

13. In a grinding machine, the combination of a grinding wheel; a carrier having a plurality of work supports in which the work is rotatively mounted at both ends and positively secured by engagement of parts separated from the surfaces to be ground and on which the work is rotatively mounted on an axis fixed relatively to the support; means acting on the carrier advancing the supports to and retarding them at the grinding position with relation to the wheel; a rotating work driver rotating the work by frictional engagement with the work surface subjected to grinding; and means automatically delivering and discharging the work from the supports.

14. In a grinding machine, the combination of a grinding wheel; a carrier; work supports on the carrier arranged in pairs, said supports being separated and adapted to rotatively and positively secure the work at both ends by engagement of parts separated from the surfaces to be ground on an axis fixed with relation to the carrier; means for advancing the carrier to bring the supports successively into, and retarding them at, the grinding position with relation to the wheel; and a driverarranged between the supports rotating the work on its axis by frictional engagement with the work surface operated upon by the grinding wheel.

15, In a grinding machine, the combination of a grinding wheel; a carrier having a pair of separated discs; work supports arranged on said discs in pairs, said supports being separated and adapted to rotatively and positively secure the work at both ends by engagement of parts separated from the surfaces to be ground on an axis fixed with relation to the carrier; means for advancing the carrier to bring the supports successively into, and retarding them at, the grinding position with relation to the wheel; and a driver arranged between the discs rotating the work on its axis by frictional engagement with the work surface operated upon by the grinding wheel.

16. In a grinding machine, the combination of a grinding wheel; a work support adapted to secure a rubber roll having an extending shaft at each end by engagement with the peripheral surface of the shaft and to maintain the axis of the shaft concentric with the axis of rotation and to present the rubber portion into grinding relation with the wheel; and a rotative work driver having its axis off-set from the axis of acre-see the work support rotating the work by frictional engagement with the roll.

17. In a grinding machine, the combination of a grinding wheel; a support carrier; a plurality of supports on the carrier adapted to support rolls having extending shafts with their axes fixed relatively to the carrier by engagement of the support with the peripheral surfaces of the shafts and adapted to maintain the axes of the shafts concentric with the axes of rotation; means for advancing the carrier to advance the rolls into grinding relation with the wheel; and rotative means off-set from the axis of the supports for driving the rolls by frictional engagement with the roll surfaces.

18. In a grinding machine, the combination of a grinding wheel; a carrier comprising a pair of discs; supports on the discs adapted to re ceive and support rubber rolls having extending shafts having their axes off-set relatively to each other and fixed relatively to the carrier and to maintain the axes of the shafts concentric with the axes of rotation by engagement with the peripheral surfaces of the shafts; means for actuating the carrier to advance the rolls into grinding relation with the wheel; and a rotating driver having its axis off-set from the axes of the supports rotating the rolls by frictional engagement with the work.

19. In a grinding machine, the combination of a grinding'wheel; a Work support adapted to secure a plurality of rubber rolls having extending shafts and to maintain the axes of the shafts concentric with the axes of rotation by engagement with the peripheral surfaces of said shafts and to present them successively into grinding relation with the wheel; and a driving roll acting frictionally against the rubber roll for rotating the rubber roll.

OSCAR A. SWANSON.