US905520A

US905520A - Feed mechanism.

Info

Publication number: US905520A
Application number: US36784807A
Authority: US
Inventors: Bengt M W Hanson; Frederick W Post
Original assignee: Pratt and Whitney Co Inc
Current assignee: Pratt and Whitney Co Inc
Priority date: 1907-04-12
Filing date: 1907-04-12
Publication date: 1908-12-01
Anticipated expiration: 1925-12-01

Description

B. M. W. HANSON &'}F. W. POST. FEED MBGHANISM.

B. M. W. HANSON 6v F. W. POST.

FEED MEGHANISM.

APYLIGATION FILED M342, 1907.

Patented Dec. 1, 1908.

2 SHEETS-SHBBT 2.

54 Fly. QS).

4g /ag /02 W 'lzesses:

UNITED sTATEs PTENT OFFICE BENGT M. W. HANSON AND FREDERICK W. POST, OF HARTFORD, CONNECTICUT, ASSIGNORS TO PRATT & WHITNEY CO., OF HARTFORD, CONNECTICUT, A CORPORATION OF NEW JERSEY. i

To all whom it may concern:

Be it known that we, BENGT M. W. HAN- soN and FREDERICK lV. POST, citizens of Sweden and the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Feed Mechanism, of which the following is a specification.

This invention relates to feed-mechanism for metal-grindingand other reducing-machines, and'is shown applied to a machine in which a cylinder is submitted to a grindingoperation, but is, in some of its details, applicable for use in other relations and in various arts.

In machines for the purpose stated heretofore in use objectionable sparking occurs between the contact-points controlled by the feeler in engagement with the work, there- .f by causing corrosion of the same, and consequently such deterioration in working, that the required precisionized accuracy of the mechanism may be more or less affected.

Our invention is intended to obviate the objectionable results heretofore accruing to a greater or less extent, and due to the vibration of the levers carrying the contact-points in the circuit controlled by the feeler as will presently be described.

In the accompanying drawings, Figure 1 is a side elevation of part of a grinding-machine, showing part of the platen-reversingmechanism in connection with elements of the cross-feed mechanism for advancing the tool-carriage toward the work. Fig. 2 is a View partially in section of mechanism for controlling contact-points which are adapted to complete an electric-circuit, thereby operating parts of the feed-mechanism. Fig. 3 is a view of the feed-mechanism showing the electrical connections with the contact-mech-4 anism shown in Fig. 2, and also showingythe parts thereof in their tripped position.

Like numerals designate similar parts, throughout the several views.

Referring to the drawings, the numeral 1 designates a shaft of mechanism (not illustrated) which may operate a device for feeding a carrier for a reducing-toohand rigid withsaid shaft is a ratchet-wheel 2. f- At one side of said ratchet-wheel and' preferably loosely mounted on the hub thereof, is a plate 3, in which is fixed a stud 4 entering a Specification of Letters Patent.

Application filed April 12, 1907.

FEED MECHANISM.

Patented Dec. 1, 1908. Serial No. 367,848.

slot 5 in the inner end of a link 6, connected at its opposite extremity with an arm 7 rigid with a shaft 8 carrying a pinion 9.

Designated by 10 in Fig. 1 is a table or platen, and by 11 are separated slides carrying dogs 12, said slides being adjustable in a groove 14 of the laten.

Referring to Flg. l the numeral 15 designates a barrel in which is mounted a stud 16, said barrel being pivoted at 17 on a plate 18 provided with lugs 19, in which are threaded screws 20. Projecting from the barrel is an extension 21 provided with a segmental rack 22 in mesh with the pinion 9 before described. At its lower end a rod 16 is double beveled at 23, and said end engages as the barrel is rocked in either direction the oppositely-beveled end 24 of an arm 26 which is pivoted at 27, and limited in its movements by screw-studs 28.

On the feed-shaft 29 of the machine is a hand-wheel 30, by which said shaft maybe manipulated.

As thus far described the mechanism is not of our joint invention, it 'being fully set forth in the application of B. M. W. Hanengage the ratchet-wheel 2. To a standard 34 of plate 3 is attachedone end of a spiralspring 35, while theopposite extremitybf said spring is connected to a lever 36 which is pivoted on stud 31back of pawl 32. A t the under side of the hub of lever 36 1s formed a catch 37, and projecting from said hub is an arm 38 having a split clamp 39 which is adjustably mounted a contact-pin or point 40 shown in Fig. 1 in engagement with a contact-Stop 41 having a loop or 95y crook-shaped top 42 at its upper end1ithe@ shank of said strip being clamped to a stand/n ard 43 rising from an arm 44 of the swinging plate 3.

In engagement with catch 37 of lever 36 is a latch 45 pivoted at 46 to the standard 43. Connected at one end to said latch a-nd at the other to a pin 47 is a spring 48 the stress of which tends to hold the latch in engagement with the catch, asshown in Fig. 1.

A pin 49 projects from lever 36 into a slot 5Q inpawl 32 so that when latch 45 is tripped, and said lever is acted upon by Pivoted on the plate 53 is a lever '59 having a head 60 in which is secured for vertical adjustment a screw 61, having a stop 62 at its upper end, and on a horizontal arm 63 of said lever is secured a contact-pin 64, and a catch 65.

A spring 66 is secured at one end to an arm 67 of the lever, and at the other eXtremity to a lug 68 of the frame-plate 53.

An electro-magnet 69 is mounted on a seat of the frame-plate, and latch 70 is pivoted to an arm 71 projected from a head.72

of said plate, while a spring 73 normallyv tends to lift the latch 70 and to hold it in engagement with the catch 65, as shown in Fig. 1.

A curved or bowed contact-strip 74 is secured to the inner side of the head 72, and when the feed is in operation, is in engagement with the contact-pin 64, but when the magnet 69 is energized in a manner soon to be described the spring 66 will throw arm 59 to the positionshown in Fig. 3, and the clrcuit will be broken. i

Adjustably secured to the table or platen 10 Ais sizing-device designated in a general wayby Xvand involving a casing 75 having a'base 76 adjustable transversely of the carr1a'ge by a screw 77 fl In this casing is pivoted an angle-lever constituting a feeler member or movable dimensioning device, having a long arm 79, and a short arm 80, the latter carrying a feeler A81, shown in Fig. 2 1n contact with the work 82. In the free end of the long arm 79 of the angle-lever is threaded4 a screw 83 having a knurled head 84 and a contact-point 85. A lever 86 is plvoted at 87 in the casing, is weighted at one end at 88, carries at the opposite end a contact-point 89, and is limited in movement by a stop-pin90. Below this `lever is a second lever 91 having a weightedend 92, and a dependmg arm ,93,A adapted to engage a stop-screw 94, said lever 9-1 carrying an insulated contact-point 95. A third contactpoint- 96 is inserted in a bushing 97 composed of insulating-material and located in the lower part of the casing X.

,Electric batteries 98' and 99 are illustrated 1n Figs. 2 and 3, and vfrom one pole of battery 98 extends a wire 100 to the contactpin 64, while from the other pole of said battery a wire 101 leads to thecontact-point 95 of lever 91. From battery 99 a wire 102 leads to contact-point 40, and another wire 103 to point 96 of the casing X, while a wire 104 leadsfrom the machine-frame to magnet 69, and a wire 105 leads from said magnet to strip 74. In a similar manner a wlre decreased by the reducing-tool, the

contactpoints

89 and 95 carried by the levers 86, 91 which are properly adjusted by

screws

83 and 94, gradually approach each-other until the stock is sufficiently reduced to require a finer or finishing cut, then the points meet and complete a circuit from battery 98 through wire 101 the machine frame, wire 104, magnet 69, wire 105, strip 74, contactpin 64 and wire 100, thereby energizing magnet 69 and causing/latch 70 to be drawn downward, so as to release the catch 65, which allows the arm 59 to be thrown to the position shown in Fig. 3 by actionv of spring 66. As soon as arm 59 is tripped the Contact between point 64 and strip 74 is released, and consequently, the circuit above mentioned is broken, thereby preventing objectionable sparking between

points

89 and 95.

In the tripped position of arm 59 the end -62 of the screw 61 falls within the path of Y until the stock is reduced to the desired precisionized diameter when the

points

95 and 96 will come in contact with each other and establish a circuit from battery 99, wire 103,

points

96, 95, the machine-frame, wire 106, magnet 51, wire 107, strip 42, contact-point 40, and wire 102, thereby energizing magnet 51 which trips latch 45 and releases lever 36, whereupon Contact between point 40 and strip 42 is immediately broken and the pawl 32 is thrown out of engagement with ratchetwheel 2 by spring 35 thereby further and finally limiting the feed mechanism m such manner that no further movement of said ratchet-wheel 4can take place.

The function of the contact-point 40 and strip 42 is identical with that of point 64 and strip 74, that is to prevent continual current through the electrical connections.

The lever 36 and arm 59 may be readily re-set to the normal position shown in Fig. 1 by means of the

handles

108, and 109, respectively.

Changes may be made in various details of the mechanism without departure from the spirit of the invention.

Havingthus described our invention, what we claim 1s:

l. The combination of an automaticallyoperative feeler member, feed-mechanism, an electric circuit havin a member provided with4 means for limi-tlng the action of the feed mechanism, means operative with the feeler member for closing said circuit to thereby cause said limiting action, and automatically-operative means for opening said circuit substantially at the time the feed mechanism is thus limited, whereby osparking in said circuit will be prevented.

2. The combination of an'automaticallyoperative feeler member, feed mechanism, an

electric circuit having a member provided with means for limiting the action of the feed mechanism and also having two contacts one of which is movable into engagement with the other by to thereby 'close the circuit andcause said limiting action, and automatically-operative means for opening said circuit immediately following the closing thereof to prevent sparking between or at said contacts,

3. In feed-mechanism, the combination, with a reciprocatory table and with reversing-mechanism, of strips for operating said reversing mechanism; a pitman; a ratchetwheel actuated by said pitman'; a shaft to which the ratchet-wheel is secured; an arm,

or plate movable around the shaft; a pafwl carried by the arm; a latch for. engaging the pawl; means for tripping the latch; and mearlis for rengaging the latch with the paw 4. In feed-mechanism the 'combinationp with a reciprocatory table and with reversing-mechanism, of strips for operating said reversing-mechanism; a pitman; a ratchetwheel actuated by said pitman; a shaft to which the ratchet-wheel is secured; an arm or plate movable around the shaft; a pawl carried by the arm a latch for engaging the pawl; means for tripping the latch; meansl for rengaging the latch with the pawl; and electrically controlled devices for operating the latch, and fory preventing sparking between the electric connections.

5. The combination, with a' shaft, of a ratchet-wheel rigid therewith; an arm or plate movable around the shaft; a pawl carried by the arm, and in engagement with said ratchet-wheel; a latch for said pawl; means for tripping .the latch; an electriccircuit connected with the latch; and means for preventing sparking between the electrical connections. i

6. The combination, with a shaft, of a ratchet-wheel rigid therewith; an arm .or plate movable around the shaft; a paw'l carried by the arm, and in engagement with said ratchet-wheel; a latch lfor said pawl; means for tripping the latch: an electriccircuit connected with the latch; means for said fe'eler member,

preventing sparking lbetween the electrical i connections; electrically controlled umeans for limiting the operation of the arm.

7. The combination,- with a shaft, of a ratchet-wheel rigid therewith; an arm or plate movable around the shaft; a pawl carried by the arm, and in en agement with -`said ratchet-wheel; a latch or said pawl;-

means for tripping the latch; an electriccircuit connected with the latch; means for preventing sparking between the electrical connections; electricallycontrolled means for limiting the operation of the arm; and a latch for said electrically-controlled means.

8. The combination, with a shaft, and a ratchet-wheel rigid4 therewith; an arm or plate movable around said shaft; a pawl carried by the arm, and in engagement with the ratchet-wheel;means for latching said pawl; means for tripping the latch; means for withdrawing the pawl after the latch has been tripped; electrically-controlled devices for actuating the latch-'tripping means; a circuit; and means-for preventing sparking between contact-points in said. circuit.

9. The combination of an automaticallyoperative member' governed by the work, a feed device, an lelectric-circuit having a member provided with means for controlling said vfeed-device, said automatically-operative member having means for closing the circuit at a predetermined point, and means `operative with the feed-device for opening. lthe circuit and preventing sparking thereln.

10. The combinatlon of an automaticallyoperable member governed by the work, feed-mechanism, an electric circuit having means in connection therewith for controlling the feed-mechanism, said automatically-operable member controlling the circuit, and automatically-operative -means for also controlling'V said circuit and preventing sparking therein.

11. The combination of an automaticallyloperative member governed by Vthe work,

feed mechanism, an electric circuit having means; and means for preventing sparking between the contact-points of said electricdevices.

13. The combination, with a dimensioning apparatus,a of movable contact-points, constituting a part thereof, a device carrying lsaid shaft; a pawl on said arm; a ratchet- Wheel carried by the shaft, and with which the pawl engages; a latch engaging a part of the pawl; an electro-magnet for tripping the latch; and means for preventing sparking between the contact-points of the electric-circuit.

14. The combination, with a dimensioning apparatus, of movable contact-points, constituting a part thereof, a device carrying one of said contact-points, and having a feeler in engagement with the work; a circuit; a shaft; an arm movable around said shaft; a pawl on said arm; ay ratchet-wheel carried by the shaft, and with which the pawl engages; a latch engaging a part of the pawl; an electro-magnet for tripping the latch; means'for preventing sparking between the contact-points of the electric circuit; and means for reducing the movement of the movable arm.

15. The combination, with a carriage, and with a sizing-device carried thereby, of a feeler carried by an element of said sizing-device; electrical -connections operated by the eeler; a circuit; feed-mechanism controlled vby said. circuit; and means for preventing sparking between the contactpoints of the electrical connections operated by the feeler.

16. The combination of a movable dimensioning-device, an electric circuit comprising a magnet and a air of contacts one of which latter is opera vle by said dimensionin -device, feed-mechanism,V an automatica1 y-operative controlling member for govfor openin erative controlling member against action and adapted to be operated by the magnet to release said controlling-member, and means the circuit automatically when the control ing member is released to prevent sparking at said contacts.

17. The combination of a movable dimensioning-device, a ratchet-Wheel, a pawl for operatmg said ratchet-wheel, an oscillatory carrier for said pawl, an automatically-operable member movable to limit the movef "mentof said carrier, a latch for normally holding said automatically-operable member against movement, a latch for normally holding' the pawl against movement; separate electric circuits including contact points operable by said dimensioning-device and magnets ufor operating said latches, and means for opening the circuits automatically on the operation of the latches.

18. The combination of a movable dimensioning-device, an electric-circuit comprising a magnet and contacts operable by said dimensloning-device, feed-mechanism, an automatically-operable controlling-member for the feed-mechanism, means controlled by the magnet for holding said controlling-member against movement and for releasing the same on the energization of said magnet, and automatically-operable means for opening the Pcircuit substantially simultaneously with the energization of said magnet to prevent sparkin at said cont-acts.

n testimony whereof we aiix our signatures in presence of two witnesses.

BENGT -M. W. HANSON. FREDERICK W. POST. Witnesses:

D. S. EGAN, W. M. BUSHNELL.