US2078757A

US2078757A - Grinding machine table reciprocating mechanism

Info

Publication number: US2078757A
Application number: US111775A
Authority: US
Inventors: Carl G Flygare
Original assignee: Norton Co
Current assignee: Saint Gobain Abrasives Inc
Priority date: 1936-11-20
Filing date: 1936-11-20
Publication date: 1937-04-27
Anticipated expiration: 1954-04-27
Also published as: GB485611A

Description

April 27, 1,937. c. G. FLYGARE GRINDING MACHINE TABLE RECIPROCATING MECHANISM Filed Nov. 20, 1936 3 Sheets-Sme?l 1 Stimm/1.!

Apri] 27, 1937. c. G. FLYGARE GRINDING MACHINE TABLE RECIPROCATING MECHANISM Filed Nov. 20, 1936 3 Sheets-Sheet 2 fe M n .m i 9 Q2u @j m 6 0o 0 4 5 @d IIII. ||1I f w 4 4. mw $5 I|| .f 1I. 1| I. y 5 1 ||`V| U 7 5 w x Sno: swf

April 27, 1937.

C, G. FLYGARE GRINDING MACHINE TABLE RECIPROCATING MECHANISM Filed NOV. 20, 1936 3 SheelS-SheaiI 5 arjZ/z/jare S Mm. Salim Patented Apr.. 27, 1937 UNITED STATES GRINDING MACHINE TABLE RECIIROCAT- ING MECHANISM Carl G. Flygare, Worcester. Mass., assignor to Norton Company, Worcester, Mass., a corporation of Massachusetts Application November 20, 1936, Serial No. 111,775

10 Claims.

The invention relates to grinding machines, and more particularly to a table reciprocating mechanism for a grinding machine.

One object of the invention is to provide a simple and thoroughly practical table reciprocating and reversing mechanism. Another object is to provide a table reversing mechanism with an improved dwell control mechanism. Another object is to provide a table reversing mechanism with a mechanism whereby a variable dwell may be obtained at each end of the table reciprocation. A further object is to "provide an electrically controlled dwell control for the table reversing mechanism. A further object is to provide a table reversing mechanism with an electrical time delay relay to control the extent of dwell at each end of the table stroke. Other objects will be in part obvious or in part pointed out hereinafter. The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts, as will be exemplified in the structure to be hereinafter described, and the scope of the application of which will be indicated in the following shown one of various possible embodiments of the mechanical features of this invention,

Fig. 1 is a fragmentary front elevation of the table reversing mechanism;

Fig. 2 is a cross sectional view on the line 2 2 of Fig. 1;

Fig. 3 is a fragmentary sectional view through the table reciprocating mechanism, taken approximately on the line 3 3 of Fig. 2, showing the gears and supporting shafts in elevation;

Fig. 4 is a horizontal sectional view, taken approximately on the line 4 4 of Fig. 2, showing the gearing partly in section and partly in elevation, and also showing the reversing cl'utch:

Fig. 5 is a fragmentary sectional view through the reversingv lever, on an enlarged scale, taken approximately on the line 5 5 of Fig. 1;

- Fig. 6 is a sectional view taken approximately on the line 3 iof Fig. 5;

Fig. 7 is a fragmentary view, showing the reversing lever and its associated parts in its lefthand end position, that is, when the table is movy 60 A grinding machine has been illustrated in the drawings comprising a base I5 which supports a longitudinally reciprocable table I6 on a at way Il and a V-way (not shown). The table I6 is arranged so that it may be reciprocated by means of a power Voperated traversing and reversing mechanism to reciprocate a work piece in operative relation with a grinding wheel.

A power driven shaft 20 is rotatably journaled in bearings 2l and 22 in a casing 23 which is fixed Within the base Ill. The shaft 20 may be driven by an electric motor contained within the machine base (not shown) or any other suitable well-known driving mechanism. The shaft 20 is provided with an enlarged portion having a pair of diametrically opposed

splines

24 and 25. A clutch member 25 is slidably supported on the enlarged portion of the shaft 20, and is provided with clutch teeth 21 and 2B which are arranged to be thrown into engagement with

clutch teeth

29 and 30, respectively. The

clutch members

29 and 30 are rotatably supported on the shaft 20 and are free to rotate thereon. The clutch member 29 has formed integrally therewith a gear 3| which meshes with a gear 32. 'Ihe gear 32 is fixed by a key 33 on a rotatable shaft 34 which is journaled in bearings, such as

ball bearings

35, 36 and 31 in the casing 23.

'I'he clutch member 30 has formed integral therewith a gear 40 which meshes with a rotatable intermediate gear (not shown) which in turn meshes with a gear 42 keyed to the shaft 34 by a key 43. It will be readily apparent from the foregoing that when the clutch teeth 28 are in engagement with the clutch teeth 30, as indicated in Fig. 4, the rotation of the shaft 20 will be transmitted through the clutch member 26 to the

clutch teeth

28 and 30, through the gear 40, the intermediate gear (not shown), and gear 42, to rotate the shaft 34.

Similarly, when the clutch member 26 is shifted toward the left (Fig. 4) so that the clutch teeth 21 engage the clutch teeth 29, the rotation of the shaft 20 is transmitted through the clutch member 26, clutch teeth 2l, clutch teeth 29, gear 3l, and gear 32, to rotate the shaft 34 in the reverse direction.

In order that the rotary motion of the shaft 36 may be transmitted to cause a reciprocatory movement of the table I6. a suitable gear driving I mechanism is interposed between the shaft 34 and the table I6. The shaft 34 is provided with a worm B5 which is either formed integral therewith or fixed thereto. The worm t5 meshes with a worm gear 46 which is supported on a rotatable shsft t1. The shaft All is journaled in bearings 138 and 39 in the casing 23. The shaft 3l also supports a small gear 50 which meshes with a large gear 5l supported on a rotatable shaft 52. The shaft 52 is journaled in

bearings

53 and 56 vtransmitted through the worm 45, the worm gear 46, the gear 50, the gear 5|, the gear 55, the gear 56, the gear 60, and rack bar 6|, to cause a longitudinal movement of the table I6.

A clutch actuating mechanism is provided for `automatically shifting the reversing clutch member 26 in timed relation with the reciprocatory movement of the table I6. A yoked member 65 is fixedly mounted on a rotatable shaft 66. The yoked member 65 is provided with

rollers

61 and 68 which ride within a groove 69 on diametrically opposite sides of the clutchmember 26. The

rollers

61 and 68 are smaller in diameter than the width of the groove 69 to provide a lost motion between the yoked member 65 and the clutch member 26. When the shaft 66 is rocked, the yoked ried, as desired.

table I6 beyond the normal reciprocatory stroke,

member 65 transmits the rocking movement to shift the clutch member 26 in the desired direction. A gear segment 69 is mounted on the end of the shaft 66. The gear segment 69 meshes with a gear segment 10 supported on the inner end of a rotatable shaft 1|. The shaft 1| is journaled in bearings 12 and 13. The gear segment 10 is fixed to the end of the shaft 1| by means of a pin 14.

A reversing lever is mounted on the front end of the shaft 1|. In the preferred form, the reversing lever is formed in two parts, a short lever 15 which is flxedly connected to the outer end of the shaft 1| by means of a pin 16. A table reversing lever 11 is rotatably mounted on a sleeve 18 which extends inwardly from the lever 15. The reversing lever 11 is provided with a slidably mounted member which slides within an elongated slot 8| formed at the upper end of the lever 11. The slide block 80 is provided with an inwardly projecting pin 82 which is arranged in the path of a pair of reversing dogs :B3 and 04, respectively, which are adjustably mounted in a T-slot 85 formed in the front surface of the table I6. By adjusting the dogs83 and B4 1ongitudinally relative to the table I6, the length of the reciprocatory stroke of the table -may be va- If it is desired to move the a. knob 86 formed integral with the slide block 80 may be raised verticallyv to lift the pin 82 out of the path of the dog 84 so that the table may be moved toward the left beyond its normal reciprocatory stroke for loading of the work piece or for truing of the grinding wheel. A safety dog 81 is also adjustably supported by the T-slot 85 and is arranged to limit the movement of the table |6 when moved beyond its normal reciprocatory stroke,

A yieldable connection is provided between the reversing lever 11 and the lever 15. The reversing lever 11 is provided with a pair of spaced studs 90 and 9|, and the lever 15 is provided with a pair of equally spaced

studs

92 and 93. -A sleeve 94 is provided with a V-shaped surface 95 which engages the

pins

90 and 92 of the levers 11 and 15, respectively. A sleeve 96 slides within the sleeve 94 and is provided at its end with a V- shaped surface 91 which engages the pins 9| and 93 of the levers 11 and 15, respectively. A spring 98 within the

sleeves

94 and 96 tends normally to hold the lever 11 in alignment with the lever 15.

During reversal, however, the lever 11 may give during its movement relative to the lever 15. This movement causes a compression of the spring 98 and a telescoping of the

sleeves

94 and 96.

A load and fire mechanism is provided which serves normally to hold the clutch member 26 either in engagement with the

clutch teeth

29 or 30. This mechanism comprises a roller |00 which engages an arrow pointmember |0| carried by the base 5. The roller |00 is supported by a. spring pressed sleeve |02 which is slidably mounted within an'arm. |03 which is in turn keyed by a key |04 to the shaft 1|. A compression spring |05 serves to exert a downward pressure on the roller |00 to maintain it in engagement with the arrow point member |0|. The mechanism above described serves as a load and fire mechanism, whereby during the period of reversal, the clutch is disengaged, during which movement the spring |05 is compressed as the roller |00 rides up the arrow point surface |0I, after which the released compression of the spring |05 tends to shift the clutch member 26 into a reverse position.

It is desirable to provide a period of dwell at each end of the table strokev in order that the grinding wheel may completely grind around the end portion of the work, that is, so that the work Vwill rotate at least one complete rotation while the table is stationary and before the table starts its movement in the reverse direction. To accomplish this result, it is desirable to provide a suitable means to disengage the clutch and to hold it in a neutral or disengaged position during face which mates with the bottom of the L groove 69 in the clutch member 26. I'he block ||0 has an upper plane surface ||2 which engagesa plane surface ||3 on the lower face of a bracket H4. The bracket ||4 is fxedly mounted on the 'casing 26. The bracket ||4 supports a spring-pressed ball ||5 which in a neutral position of the clutch member 26 engages a V-shaped groove ||6 in the block ||0 and serves to hold the clutch member 26 in a central or neutral position. The ball ||5 is forced downwardly by means of a spring ||1 the tension of which may be adjusted by a screw |18.

In order to prevent the load and re mechanism from shifting the clutch member 26 immediately into a reverse position, a suitable latch mechanism is provided which serves to check the movement of the clutch shifting lever after the roller |00 passes the high point on the arrow surface |0|. downwardly extending arm |20. The lower surface of the arm |20 is provided with a notch |2| and two adjacent partial'cylindrical faces |22 and |23 respectively. A spring-pressed plunger |24 backed by a spring |25 engages either the notch |2| or the surfaces |22 and |23 during-the operation ofbthe machine. When the reverse lever v1l' is in its extreme position, either right or left-hand as indicated in Figs. 'I and 8, the plunger |26 rides on the surfaces |22 and' |23, respectively. During the period of reversal, when the lever 11 is rocked by the table dogs 83 and 84, the arm,I |20 moves with the lever 11 and when the arms |20 has moved a sufficient distance, the plunger |24 rides olf the surface |22 (Fig. 7) and the released compression` of the spring |25 forces The lever 15 is provided with a` amava? the plunger |26 into the groove |2|, which serves to limit the rocking movement of the reversing lever I5 and its associated parts to prevent the clutch member 26 from being shifted into the opposite position.

To produce a period of dwell of a desired but adjustable extent,l a suitable dwell control mechanism is provided which is arranged to withdraw the plunger |2| after a predetermined time interval so that the released compression of the spring |05 throws the roller |00 relative to the arrow point IOI and rapidly shifts the clutch member 2G into a reverse position so as to start the table I 6 moving in the opposite direction. In the preierred form, an electrical control device is provided for withdrawing the plunger |24 in timed relation with the movement of the reversing lever. A lever |30 is pivotally mounted on a stud |3| carried in a projection |32 of the base I0. The lever |30 passes through an aperture |33 in the springpressed plunger,|24. The lever |30 is provided with an enlarged portion |35 which slides freely Within the aperture or slot i3d when the lever |30 is rocked about its supporting pivot |3| The outer end of the lever |30 is connected by a stud ii'b with a link |31. The lower end of the link |31 is connected by a stud I 38 with an armature |39. of an electric solenoid |60. It will be readily apparent from the foregoing disclosure that when the solenoid |130 is energized, it produces a downward movement of the armature |39, thereby rocking the lever |30 in a clockwise direction (Fig. 1) to cause a downward movement of the springpressed plunger |243, thereby withdrawing the plunger |2154 from the groove or notch |2| and allowing the released compression of the spring |05, acting on the arrow point surface |I, rapidly to shift the clutch member 26 into the reverse position and thereby start the table moving in the opposite direction.

In order to energize the solenoid |40 in timed relation with the shifting of the reverse lever 11, and to provide a period of dwell of the desired extent, a limit switch |45 is mounted on the front of the machine base. The limit switch |45 is provided with an actuating roller |46 which is carried by the arms Ilii. The limit switch roller H36 is arranged in the path of an adjustable screw M8 which is carried by the lever TI. The limit switch |45 is a normally open limit switch and is arranged so that when the reversing lever is moved into the position illustrated in Fig. l, the screw |48 engaging the roller |46 rocks the limit switch to a closed position. The limit switch is connected to power lines |50.

In order to control the extent of dwell, a suitable time delay device is provided, such as an electrical time delay relay |i. The time delay relay I5| may be of any of the standard, wellknown electrical timev delay relays. The relay |5| is connected between the power lines |50, the limit switch M5 and the solenoid |60 in such a way that the closing of the limit switch M5 serves to set the time delay relay |5| in motion, which after a predetermined time interval operates to make a circuit to energize the solenoid M0 and thereby withdraw the spring pressed plunger |2i from the notch or groove I2| in the arm `|20 so as to allow the released compression of the spring |05 rapidly to shift the clutch member 26 into a reverse position. By adjusting the time delay relay I5|, a dwell of anydesired extent may be obtained at the end of each table stroke.

The operation of the improved table reversing mechanism is readily apparent from the foregoing disclosure. Assuming the table I6 to be moving in a direction toward the right, the reversing lever i7 and the associated parts are in the position illustrated in Fig. '7 and remain in this position until the dog 03 engages the pin 82 and rocks the reversing lever 'I7 in a clockwise direction (Fig. 7) on its supporting sleeve 78. The initial movement of the lever 'il serves through the stud 90 to compress the spring 98 until suncient compression has been stored up to rock the lever i5 and shaft II against the tension of the spring |05, causing the roller |00 to ride up the surface of the arrow point I0| through the position I00a until the lever reaches and passes the high point of the arrow. When the lever |20 shifts a suflicient distance so that the surface |22 rides off from the head of the spring-pressed plunger |24, the plunger |24 is forced into engagement with the notch or groove |2| by the released compression of the spring |25. The continued movement of the table carries the. roller |00 over .the high point of the arrow, after which the released tension of the spring |05 causes the roller to ride down the other side of the arrow point I|JI until stopped by the plunger |24 engaging the end of the notch or groove |2i, thereby stopping thev roller |00 in the position |0012. During this shifting movement of the lever 'l1 and the associated parts, the yoke 65 is rocked toward the left (Fig. 4) and after the lost motion has been taken up by

rollers

61 and 58 and groove 69, shifts the clutch member 20 toward the left (Fig. 4) to disengage the clutch teeth 28 from the clutch teeth 30. When the clutch member 20 reaches its central or neutral position, the spring-pressed ball H5 (Fig. 9) engages the v-groove IIE in block ||0 and holds the clutch member 26 in its neutral or central position.

When the reverse lever 'Il reaches position (Fig. 1), the adjustable screw |48 engages a roller |46 and thereby closes the limit switch |45 which in turn serves to' set the time delay relay |5| in operation. The electrical time delay relay |5I has been previously set for a definite time interval, after which the time delay relay serves to close a circuit to energize the solenoid |40 which in turn rocks the lever |30 in a clockwise direction (Fig. 1) to withdraw the plunger |24 from engagement with the groove I 2|, thereby releasing the compression of the spring |05 which rapidly shifts the roller from position |001 into position |0||c and at the same time serves through the gear segments 'i0 and gear segment 09 to rock the yoke |35 and shift the clutch member 26 rapidly toward the left (Fig. 4) so as to throw the clutch teeth 21 into engagement with the clutch teeth 29 after the table has been held stationary for a predetermined dwell or time interval.

Similarly, the control lever 77 remains in its right-hand position during the movement of the table i6 toward the left until the dog 84 engaging the pin 82 shifts the reverse lever TI in a counterclockwise direction which in turn serves to shift the roller |00 from position |000 to position I00b and then into position |00a, at which point the clutch teeth 2l and 29 are disengaged and the plunger |24 is forced into engagement with the groove |2| to hold the roller |00 in the position |00a, thereby preventing shifting of the clutch member 25 into a reverse position. When the lever TI swings from full line position (Fig. 8) in a counterclockwise direction into a vertical position, the screw |08 engaging the roller I 40 of the limit switch |65 again closes the limit switch which in turn sets the electrical time delay relay I 5i in operation. The relay i5i, after a predetermined set time interval, makes a circuit to energize solenoid M0 which in turn again withdraws the plunger |24 from engagementwith the notch |.2i and allows the roller |00 to move from positionilla into position illil (Fig. 8), thereby shifting the clutch member 26 toward the right to engage the clutch teeth 28 with the clutch teeth 30 and thereby start the table moving in a direction toward the right after a predetermined period of dwell.

It will thus be seen 'that there has been provided by this invention apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved., -As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all` matter hereinbefore set forth or shown -in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

I claim:- i

` 1. In a grinding machine, a longitudinally reciprocable table, means to reciprocate said table, means including a lever to stop said table movement, adjustable dogs on saidftable to actuate said lever, and an electrically controlled mechanism to start movement ci lthe table in the re- I verse direction after a-predetermined period of dwell. v

2. In a grinding machine, a longitudinally reciprocable table, means to reciprocate said table, means including a lever to stop said table move- -ment, adjustable dogs on said table to actuate said lever, and an electrically controlled mechanism which is actuated in timed relation with Asaid lever to start the table moving in the reverse direction after a predetermined time interval. a

3. In a grinding machinaa longitudinally reciprC-cable table, means including a lever to stop said table movement, adjustable dogs on said table to actuate said lever, and an electrically controlled mechanism including a limit switch actu- `ated by said lever, an electrical time delay relay which is set in motion by said switch, and a solenoid which is energized by said time delay relay after a predetermined time interval to start the table moving in the reverse direction.

4. In a grinding machine, a longitudinally reciprocable table, mechanism including a clutch to reciprocate said table, a reversing lever to disengage said clutch, adjustable table dogs to actuate said lever, and an electrically controlled clutch actuating mechanism which is arranged to throw said clutch into a reverse position after a predetermined period of dwell to start the table moving in the reverse direction.

5. In a grinding machine, a base, a longitudinally reciprocable table, mechanism including a reversing clutch to reciprocate said table, means including a reversing lever and table dogs to disengage said clutch, means to hold said clutch in a neutral position, and an electrically controlled mechanism winch is actuated in timed relation with said reverse lever to shift (the clutch into a reverse position after a predetermined time interval.

n 6.v -In a grinding machinefa base,'a longitudinally reciprocabl'e table, means including a revversiiigclutch to reciprocate said table, a reaware? versing lever arranged to disengage said clutch, adjustable table dogs to actuate said lever, a dwell control mechanism to cause an adjustable period of dwell at the. end of the table stroke including an electric switch actuated in timed relation with said reverse lever, a time delay relay controlled bysaid switch, and a solenoid which is controlled bysaid relay to shift said clutch into.

a reverse position after a predetermined time interval.

dogs to disengage said clutch, and an electrically controlled mechanism including a limit switch actuated by said reverse lever, an adjustable electrical time delay relay which is set in motion by said switch, and a solenoid which is engergized by said time delay relay after a predetermined time interval to throw said clutch into a reverse position to reverse the direction of movement of saidv table.

8. In a grinding machine, a base, a longitudinally reciprecable table, means including a rack and gear mechanism to reciprocate said table, a clutch'to reverse the direction of movement of said gear mechanism, means including a reversing lever to disengage said clutch, adjustable table dogs to actuate said reversing lever, a springpressed plunger to hold said clutch in a neutral position, and anelectrical dwell control mechanism including a solenoid operatively connected to withdraw said plumger and thereby shift said clutch into a reverse position to change the direcv tion oi movement of said table.

9. In a grinding machine, a base; a longitudinally reciprocable table, means. including a rack and gear mechanism to reciprocate said table, a

clutch to reverse the direction of movement of said gear mechanism, means including a reversing lever and table dogs to disengage said clutch at the end of a table reciprocation,` a springpressed plunger to hold said clutch in a neutral position, and an electrical time delay mechanism including a switch actuated by said reversing nally reciprocable table, means including a rack and-gear mechanism to reciprocate said table, a clutch toreversethe direction of movement of saidv gear mechanism, a load and fire mechanism arranged normally to hold said clutch in one of two operating positions, means including a reversing' lever' and tabledogs to disengage said clutch -at the end of a table reciprocation, a spring-pressed plunger to hold said clutch in a neutral position, and an electrical time delay mechanism including a switch actuated by said reverse lever,-an electrical time delay relay operated thereby, and a solenoid energized by said relay after a predetermined time interval to withdraw said plunger and allow the load and re mechanism to throw the clutch Into a reverse position after a predetermined period of dwell.v

CARL G. FLYGARE.

DISCLAIMER 2,078,757.-Ua1^l G'. Flygare, Worcester, Mass. GRINDING MACHINE TABLE RECIP- ROCATING MECHANIsM. atent dated April 27, 1937. Disclaimer filed March 12, 1941, by the assignee, Norton, Company.

Hereby enters this disclaimer to claims 1, 2, and 3 in said specification.

[Oficial Gazette April 8, 1.941.]