US2085767A - Stopping device for can machinery and the like - Google Patents

Description

July 6, 1937. R. w. REID 2,085,767

STOPPING DEVICE FOR CAN MACHINERY AND THE LIKE Filed March 2, 1933 3 Sheets-Sheet l INVENTOR JW m C ATTORNEY L j i .0 i 4 July 6, 1937. R w 2,085,767 Y STOPPING DEVICE FOR CAN MACHINERY AND THE LIKE Filed March 2, 1933 3 Sheets-Sheet 2 F zg: 5 m

4 Z3 O O v a a 24 z 6/ 7 f I ATTORNEY July 6, 1937. R. w. REID 2,085,767

STOPPING DEVICE FOR CAN MACHINERY AND THE LIKE Filed March 2, 1933 3 Sheets-Sheet 3 INVENTOR 6'. ATI'ORNEY Patented July 6, 1937 v PATENT OFFICE STOPPING DEVICE FOR CAN MACHINERY AND THE LIKE Robert W. Reid, San Jose, Calif., assignor to American Can Company, New York, N. Y., a corporation of New Jersey Application March 2, 1933, Serial No. 659,267

12 Claims. (Cl. 113-14) The present invention relates to control of operations in a high speed machine receiving articles such as can ends and has particular reference to quickly stopping the feeding of the ends into the machine while other high speed and relatively heavy operating parts of the machine are being brought to a stop.

In machines operating on a succession of articles such as can ends where there is a mass of relatively heavy moving parts and particularly in relatively high speed operating machines the momentum of the moving parts injects a time factor when stopping the machine which must be considered.

A can end lining machine is one example of machines in the can making art which has a number of relatively heavy moving parts, which machine operates at relatively high speed and which receives a succession of can ends and which applies a liquid compound to the ends during their passage through the machine. The time required to fully stop a machine of this type, owing to the momentum of its moving parts, is sufiicient to cause an imperfect lining in such of the can ends as are in the machine while it is slowing down.

Such can ends are imperfectly lined and are unfit for commercial use. They are called dirty ends and represent a loss as it does not pay to clean and reline them. Furthermore, dirty ends represent a hazard for if permitted to go through further can manufacture leaky cans may be produced with resultant loss not only of the can but possibly also the contents.

In the description that follows and in the drawings can end lining machines will therefore be referred to in order to more concretely point out the invention.

The principal object of the present invention is the provision of electrical devices having two distinct functions; the one of stopping a high speed machine such as a can end lining machine and the second of more quickly terminating the further feeding of the can ends into the machine.

An important object of the invention is the provision of locking devices in machines of the character described which prevent feeding of the can ends into the machine while the other moving parts are being brought to rest.

A further important object of the invention is the provision of electrical control devices for performing the dual machine operations referred to, which after the machine has been stopped,

require only closing of the main line or power switch to again resume all operations including the feeding of the can ends into the machine.

Numerous other objects and advantages of the invention will be apparent as it is better understood from the following description, which, 5 taken in connection with the accompanying drawings, discloses a preferred embodiment thereof.

Referring to the drawings:

Figure 1 is a plan view of a can end compound 0 lining machine in which the present invention is embodied, parts of the machine being broken away and parts being shown in section;

Fig. 2 is a front elevation of the machine shown in Fig. 1, parts being broken back and 15 shown in section;

Fig. 3 is a plan view similar to Fig. 1 showing certain of the moving parts in av different position; v

Fig. 4 is a longitudinal sectional view taken 20 substantially along the broken line 4-4 in Fig. 3;

Fig. 5 is a transverse sectional view taken substantially along the line 5-5 in Fig. 1; and

Fig. 6 is a schematic view showing two lining machines connected in an electrical wiring dia- 25 gram of electrical circuits embodying the stopping devices.

In compound lining machines for lining can ends, such as is hereinillustrated and described,

a liquid lining material is deposited within the 30 channel of a can end, each end having been "properly removed from a magazine or stack of can ends and fed into lining position by an end feeding device. Such a machine is controlled by the electrical devices so that when the operating parts of the machine are coming to a stop following interruption of the electrical energy passing through the driving motor of the machine, locking members quickly operate and prevent further feeding of the can ends into the machine. 40

The device is adapted for the control of more than one machine, lining machines of this character ordinarily being operated in tandem and discharging the lined can ends into a unit drying machine or other suitable place of deposit. In 45 Fig. 6 of the drawings, therefore, the electrical wiring diagram illustrating the electrical features of the automatic controls is shown as connecting with two such lining machines and a description of the electrical circuit as given in 50 the specification will include this control for two machines.

A can end lining machine l0 such as is here considered includes a frame II on which most of the working parts are supported and which is formed with a table top l2 (Figs. 1 to .5, inclusive) A can end magazine frame in the form of a bridge member I3 is carried upon the table l2 and is secured in place by screws M. This bridge member is centrally apertured as at l5 and a number of vertical rods l6 extend upwardly from the bridge member adjacent the opening and confine a stack of curled can ends l1 within the magazine.

The bottom of the stack is arranged through the opening l5 and the canends are released one at a time, the lowermost end being cut oil from the bottom of the stack and advanced to a compound lining station by a reciprocating slide 2|. This slide operates in a groove formed in the top of the table I2 and is held against transverse displacement by shoulders or walls 22 of the groove.

Retaining plates 23 secured on topof these shoulders 22 by screws 24 overlap the edges of the slide 2| and hold it against vertical displacement.

The slide 2| is provided with a depending lug 26 which extends through and moves back and forth within a slot 21 cut in the table l2, the lug being pivotally connected at 28 to one end of a connecting rod 29. The opposite end of the rod is connected at 32 (Fig. 2) to a crank 33 mounted on one end of a shaft 34 journaled in bearings formed in the frame The shaft 34 may be the main drive shaft from which all of the moving parts of the machine receive their actuation, the source of actuating power for the .drive shaft being diagrammatically shown in Fig. 6 as an electric motor 36. This will be more fully described presently in connection with the electrical system.

A pair of slide bars 4| (Figs. 1, 3 and 5) move back and forth over the upper surface of the slide 2| and these bars effect the separation of" the lowermost can end H from the stack, dropping it into position on the slide 2|. These bars are secured together by a cross bar 42, and the opposite ends of the former pass through'slots 43 formed in the bridge member t3 on opposite sides of the opening IS. The bars 4| are provided with diametrically opposed inwardly extending projections 44 which act as separator blades engaging between the lowermost can end in the stack and the end next above to effect the separation referred to. These parts 4|, 44 are typical of mechanically operable meansfor delivering can parts to the feeding elements 26, 2|.

These slide bars 4| are moved by the slide 2|, the cross bar 42 carrying a pin 45 which engages within a slot 46 formed in one end of an arm of a bell crank lever 41. This leverv is pivoted at 48 to an extension 49 projecting from the bridge member l3. A second arm of the lever is formed as a cam arm 52 which extends at right angles to the lever arm which'engages the pin 45.

The cam arm is yieldably held in engagement with a roller 53 carried on a stud threadedly engaged in a bracket 54. This bracket is slotted and is adjustably secured on the top of the slide 2| by a bolt 55. The arm 52 is provided with a right angled extension 56 (Fig. 1) and one edge is formed as a cam surface 51 which is engaged by the rounded end of a pin 58. This pin is 'slidably mounted in a bore 59 formed in a block 6|. its opposite end being reduced in diameter as a stem 62 which passes through a wall 63 of the block. A spring 64 surrounds the stem 62 and exerts outward pressure on the larger section of the pin 58 holding its rounded end in engagement with the extension 56.

This rocks the bell crank lever 41 on its pivot 48 and holds its arm 62 against the slide roller 53. The block 6| is secured to the side of a bracket 65 (Fig. 2) by bolts 66 and bolts 61 hold the bracket on the side of the table l2.

By reason of the shape of the wall of the cam arm 52 movement of the slide 2| on its backward stroke (Fig. 1) rocks the bell crank lever 41 in a counterclockwise direction and draws the projections 44 of the bars 4| in between the edges of the can ends |1 within the stack and separates the lowermost end as previously described. When the slide moves forward the roller 53 allows the bell crank lever to move clockwise under the action of the spring 64 and the projections 44 of the bars 4| are moved forward out from under the stack of can ends.

When the slide 2| reaches its backward position (Fig. l) the separated endl1, which has been held under the stack by the bridge member l3 and which has been resting on the moving slide, falls in front of V-shaped walls 1| forming the forward edge of the slide and onto the top of the table l2. The next forward movement of the slide pushes the end over the surface of the table into a compound lining station 12.

At the lining station 12 the end |1 rests upon a chuck 13 (Fig. 4) and may be lifted and clamped between the chuck and a holding member or pad 14. The actual lining of the flange of the end is effected by discharging a liquid compound into the flange while rotating the end on a vertical axis and beneath a discharge nozzle 15. Engagement with the pad 14, when a can end is in proper place on the chuckyopens a valve in the nozzle 15 and when the chuck is again lowered and the pad allowed to move down, discharge of the compound through the nozzle is cut oil. The can end is rotated beneath the nozzle to present the entire flange for lining. If the chuck 13 is raised without a can end in proper position the pad 14 is not lifted and the valve, controlling discharge of compound through the nozzle 15, is not actuated.

Reference should now be had to Fig. 6 in connection with an explanation of the control devices and of the electric circuits associated with the lining machines. The electric motors 36 for driving the shafts 34 of the lining machines are wired in a three-phase electric circuit having lead wires 8|, 82, 83 which preferably pass through a switch box 84. This switch box contains the principal units of the electric control devices. A three pole switch 85 located in the switch box is placed in the lead wires which extend from the switch as wires 86, 81, 88, these wires being connected with the two motors 36. When the switch 85 closes the circuit through the motors their field windings are excited and driving power is applied to 'the drive shaft 34 of each lining machine H).

The switch 85 is constructed so that it will not, of itself, keep the circuit in the lead wires closed and provision is therefore made for an auxiliary holding circuit. This includes a wire 9| connected with the wire 86 which passes through a push button switch 92 of the momentary circuit breaker type, the wire 9| being connected with the coil of a solenoid 93. The switch 85 is formed with an arm 94 which is secured to a movable core 95 passing through the center switch 85, the solenoid 93 is energized by the auxiliary holding circuit and the solenoid core 95 is held up and the switch 85 remains in its closed position.

If the switch 92 is actuated the holding circuit is broken at that point and the solenoid 93 is de-energized. This allows the switch 85 to fly open and break the motor circuit passing from the lead lines. When the switch 85 is once opened there can be no auxiliary holding circuit through the solenoid until that switch is again manually closed.

As soon as the motor circuit is broken on a machine its shaft 34 and the parts actuated by it begin to slow down and in time come to a rest. This is what is taking place with the feed slide 2I of the lining machine, the momentum incident to its movement and to the movement of connected parts giving the time lag referred to. Provision is made, however, for more quickly stopping movement of the can end separating bars 4I so that no more can ends will be cut out from the magazine following the breaking of the motor circuit.

To hold the bars 4I against further movement at such a time an independent electric circuit is utilized in connection with certain mechanical parts on the machine to hold the bell crank lever 41 against movement and in the position where the separator projections 44 of the bars 4I extend in the magazine opening I with the stack of can ends supported thereon. It will be understood that any can end at the lining station 12 during the moment of interruption of the motor circuit will be properly lined by the time the operating parts at that station come to rest, the time lag carrying over enough to sufiiciently line one end.

The mechanical parts associated with the bell crank lever 41 are carried upon the bracket 65 and comprise an electro-magnet IOI (Figs. 2 and 6) which is secured to a bracket I02 secured to the side of the bracket 65. The bracket I02 carries a foot I03 which provides a horizontal pivotal mounting I04 for a latch finger I05 which is located above the'extension 56 of the arm 52.

The finger I05 is formed with a notch or recess I06 adjacent its free end and cut in its under side and on top it is projected at I01 to form a pad. This pad acts as an armature for the electro-magnet IOI when the latter is energized and at such time the finger I05 is held in raised position (Fig. 2) with the recess I06 above the edge of the extension 56 of the arm 52.

When the electro-magnet IOI is de-energized, the finger I05 has nothing to hold it up and it immediately falls with its free end coming down on the extension 56. This extension may be in any position depending on the position of the bell crank lever 47 but before it makes a complete cycle of movement the edge of the extension snaps into the recess I06 of the latch finger. The extension cannot then move back to allow further pivoting of the bell crank lever 41 and the separator blades 44 remain under and support the stack of ends. This does not prevent further movement of the slide 2I which continues on until the momentum of its connecting parts is exhausted, this slide movement idly carrying its roller 53 back and forth Without efiect.

The electric circuits which are utilized to effect this sudden stopping of the feeding of ends from the magazine comprise a magnet energizing circuit wired to pass through the electro-magnet IOI (Fig. 6) and a shunt circuit associated with the switch box 84 and with the magnet energizing circuit. By means of these circuits the electro-magnet IN is de-energized as soon as the switch 85 in the motor circuit moves to open position. This will now be described.

The magnet energizing circuit enters through a lead wire III (Fig. 6) and passes out through a lead wire II2. Wires H3, H4 are tapped into the lead wire III and are respectively connected to one sideof an electro-magnet IOI in each machine I0. The opposite side of the respective magnets is connected by wires H5, H6 which pass through resistant lamps I I1, H8 and thence back to the other lead line H2. The electromagnet in each machine is thus included in a closed magnet energizing circuit taking energy from the lead lines III, II2.

When current is flowing through the circuit it passes from the lead wire III along the wire H3 or II4 according to which machine is considered, through the particular magnet IOI involved and returns by way of the wire H5 and lamp H1 or by way of the wire I I6 and lamp I I8 thence passing out through the lead wire I I2. As long as the magnet IOI of a lining machine is energized its latch finger I05 is clear of the bell crank lever 41 and normal feeding of can ends from the magazine continues. As long as electrical energy flows through a magnet energizing circuit the lamp within the circuit glows dimly, the electrical resistance through the coil of the magnet involved being such as to determine this diminished amount of illumination. A dimly glowing lamp therefore indicates that the electricity is properly flowing in the system.

The shunt circuit referred to, as associated with each magnet energizing circuit just described, is established by opening of the motor circuit switch 85. This shunt circuit utilizes most of the wiring in the magnet energizing circuit and when established provides an electric path having less electrical resistance than the path through the magnet IOI. The magnets IOI therefore are cut out electrically when the switch 85 is opened.

A wire I2I connects the wire III with the solenoid core 95 of the solenoid 93. The solenoid core at its bottom end is enlarged to provide a foot I22 which, when the core is in raised position, is directly over and spaced above two contact points I23, I24. When the switch 85 is thrown to open the motor circuit this foot drops down on to the contact points. The contact point I23 is connected by a wire I25 to the wire H5 and the contact point I24 is similarly connected by a wire I26 to the wire H6.

The shunt circuit in each of the two lining machines shown is established as soon as thesolenoid core 95 drops and forms connection between its foot I22 and the contact points I23, I24. An electric current for one machine then flows through the wire I I I. the wire I2I, foot I22, contact point I23, wire I25, wire II5 through the lamp Ill and thence out through the lead wire II2. This being a shunt circuit, current is diverted from the wires II3, I I5 and from the electro-magnet IOI connected therewith.

In like manner the shunt circuit for the other machine utilizes the wires I I I, I2I, foot I22, contact point I24, wires I26, II6 through the lamp I I8 and back to the lead wire I I2. This being .a, shunt circuit, current is diverted from the wires H4, H6 and from the electromagnet IOI in that line. 4

The lamps H1, H8 are included in the shunt circuits and owing to the lesser resistance in these circuits, in comparison with the resistance of the magnet coils in the magnet energizing circuits, the lamp will glow brightly. The lamps therefore not only act as equalizers for the two variable circuits (energizing and shunt) but also provide visual indication telling the operator that switch 85 is closed (dim light) or open (bright light). As soon, therefore, as the shunt circuit comes into play the locking fingers I05 fall as has been previously described and can end feeding ceases.

It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof.

I claim:

1. In a machine for operating on sheet metalparts the combination of devices for operating on said parts, feeding means for delivering said parts to the operating devices, reciprocating means for delivering the can parts to said feeding means, an electric motor and a main electric circuit including the said motor for driving said operating devices, driving connections whereby said reciprocating means are operatively connected with said operating devices, magnetic means controlling said driving connections, an electric circuit including said magnetic means, and means for interrupting said main circuit and deenergizing the circuit of the magnetic means to disconnect said driving connections.

2. In a machine for operating on sheet metal parts the combination of devices for operating on said parts, feeding means for delivering said parts to the operating devices, reciprocating means for delivering the can parts to. said feeding means, an electric motor and a main electric circuit including the said motor for driving said operating devices, driving connections whereby said reciprocating means are operatively connected with said operating devices, magnetic means controlling said driving connections, an electric circuit including said magnetic means, and means for interrupting said main motor circuit and deenergizing the circuit of the magnetic means to disconnect said driving connections, said circuit of the magnetic means being operable from said main circuit.

3. Control devices for can machinery and the like, having in combination: movable actuating elements for operating on can parts, feeding elements for presenting said can parts for a said operation, mechanically operable means for delivering can parts to said feeding elements, an electric motor and electric circuit for driving said actuatiiflcing elements, magnetic means connecting said mechanically operable means with said motor, and means whereby'said magnetic means are de-energized to stop the feeding of said can parts in advance of the stoppage of said movable actuating elements, when said circuit is interrupted to stop the operation.

4. Control devices for can machinery and the like having in combination, elements for operating on can parts, an electric circuit and motor for driving said operating elements, feeding elements actuated by said electric motor for presenting can parts to said operating elements, and magnetic means operated by another circuit for holding certain of said feeding elements in operation while said operating elements are working and means whereby the breaking .of the first circuit acts to,

disconnect certain of said feeding elements from said electric motor independently of the stoppage of said operating elements.

5. Control devices for can machinery and the like, having in combination operating elements for operating oncan parts, a magazine for holding a plurality of said can parts, removing means for taking said can parts successively from said magazine, feeding elements for delivering said removed can parts to said operating elements, an electric motor and circuit for actuating said removing and feeding and operating elements, and magnetic means operated by another circuit for controlling the actuation of said removing means when the first circuit is interrupted.

6. Control devices for can machinery and the like having in combination, a plurality of can end lining mechanisms, a plurality of can end feeding slides for delivering can ends to said lining mechanisms, a plurality of can end stacks, a plurality of means for removing can ends from said stacks to said feeding slides, a plurality of motors and an electric circuit for actuating said mechanisms, slides and removing means, magnetic means controlled by another circuit for holding said removing means in operation, and means for interrupting said motor circuit and deenergizing said magnetic means and stopping the operation of said removing means.

7. Control devices for can machinery and the like, having in combination means for operating on can parts, feeding devices for feeding can parts to said operating means, an electric motor and electric circuit for the same for actuating said operating means and feeding devices, means for terminating the flow of electric energy in said circuit, and magnetic means controlled by another circuit for maintaining said feeding devices in operative condition while the motor circuit is uninterrupted, whereby the feeding of can parts is stopped when said flow of electric energy is terminated independently of the gradual stopping of other parts of said machinery.

8. Control devices for can machinery and the like, comprising in combination elements for operating upon can parts, a magazine for holding a plurality of said can parts, means for successively releasing the parts by gravity from said magazine, feeding elements for receiving said re- I leased can parts and delivering the same to said operating elements, locking devices for holding said releasing means against movement, an electric motor and circuit for the same for actuating said machinery, a circuit and an electric magnet controlled thereby for preventing said locking devices from operating, a switch for interrupting said motor circuit, and means effective at the same time for de-energizing said magnet and for bringing said locking devices into holding position to prevent further feeding of said can parts from said magazine.

9. Control devices for can machinery and the like, having in combination: elements for operating on can parts, electric means for driving said operating elements, a magazine for holding said can parts, reciprocating means for successively releasing said can parts from said magazine, feeding elements for presenting said released can parts to said operating elements, locking devices for holding said reciprocating means against movement, an electric switch control including a primary circuit passing through said electric driving means and a circuit having means for operating said locking devices, one position of said switch control closing said primary circuit and driving said operating elements and reciprocating elements and releasing means through said electric means, and another position breaking said primary circuit and stopping said operating elements and also closing said locking device circuit and causing said locking devices to prevent further releasing of said can parts while said operating elements are coming to rest.

10. In a machine for operating on metal parts the combination of devices for operating on said parts, an electric motor and circuit for actuating said devices, means for feeding said parts to the operating devices, means for arresting said feeding means, a magnet for holding the arresting means in inoperative position, an electric circuit for energizing said magnet, means for breaking said motor circuit, and means for deenergizing said magnet when the motor circuit is broken whereby the feeding of said parts is stopped in advance of the stoppage of said operating de-,

vices.

11. In a machine for operating on metal parts the combination of devices for operating on said parts, an electric motor and circuit for actuating said devices, means for feeding said parts to the operating devices, means for arresting said feeding means, a magnet for holding the arresting means in inoperative position, an electric circuit for energizing said magnet, means for breaking said motor circuit and de-energizing the magnet. whereby the feeding of said parts is stopped in advance of the stopping of said operating devices.

12. In a machine of the character described, the combination of devices for operating on metal parts, an electric motor and circuit for actuating said devices, means for feeding said parts to the operating devices, means for arresting said feed: ing means, a magnet for holding the arresting means in inoperative position, an electric circuit including a shunt circuit for energizing said magnet, and means for breaking said motor circuit and causing the electric current to be diverted from the magnet to said shunt circuit, whereby said magnet is de-energized when the motor circuit is broken,'and the feeding of said parts is stopped in advance of the stoppage of said operating devices.

ROBERT W. REID.

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