US2526868A - Ornamenting machine - Google Patents

Description

Oct. 24, 1950 H. H. HOFFMAN ET AL ORNAMENTING MACHINE 2 Sheefs-Sheet l Filed Oct. 2l, 1946 ORNAMENTING MACHINE 7 l mi. uw s o In -wh .Hl m 2V 9,@ l 1 u 2 .o a 2 IHHMMW l y w 4 ./f, 2 w W; y :C d. d I w 6 A m an l M m FIGJJ JosEP/f 6'. Heeze/(s.

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Patented Oct. 24, 1950 ORNAMENTING MACHINE Howard H. Hoffman, Newport, Ky., and Joseph G. Herbers, Cincinnati, Ohio, assignors to The Louis G. Freeman Company, Cincinnati, Ohio, a corporation of Ohio Application October 21, 1946, Serial No. 704,743

(Cl. lOl-316) 5 Claims.

In the United States Patent to B. W. Freeman No. 2,241,398 is described a machine for ornamenting such articles as pieces of shoe upper material in which there is provided a die carriage that slides to and fro in the machine and a plunger on which is mounted the work to be treated, this plunger having a motion to and from the die carriage.

There is described in that patent a mechanism whereby when a piece of work is ready to be operated upon, being located on the plunger serving as a bed, the operator treadles the machine with the result of connecting contacts so as to operate a magnetic clutch. The clutch is arranged to drive a crank which moves through one half stroke which brings the die carriage forward from the back of the machine to a position located over the plunger or bed. When the care riage arrives at this point the clutch is disengaged automatically by opening the magnetic switch controlled by the operation of a member moving with the crank, and the die carriage stops. However, in moving to its forward position the die carriage operates a system of links and levers that throws out a latch for the plunger operating shaft of the machine, said latch normally maintaing a clutch block out of position to couple the said shaft to a driving pulley. The latch is tripped in such a way as to fall back int'o position so that it will lift the block out of meshing position when the plunger shaft has moved through one revolution. In moving through this revolution, then the plunger shaft is intended to complete one stroke only. This stroke will push up the bed that supports the work and pull it back again during this cycle. When the bed comes back again a switch element is operated which closes the magnetic clutch again with the result that the crank that moves the sliding die carriage completes another half stroke, this time bringing the die carriage back to its starting position, whereupon the magnetic clutch is released and the die carriage comes to rest.

The problem of which the present invention is a solution is an adequate and fool-proof mechanism which will result in inhibiting the return movement of the die carriage, if the press plunger for any reason continues to operate, instead of making just one revolution. It will be appreciated that when the die carriage is in forward position, if the clutch block should become so worn that it does not work properly, or the device for resetting the clutch block latch does not function to assure a single revolution of the plunger shaft. that this shaft Will 60111711111@ Q operate. starting position nevertheless, and the plunger will strike it when out of proper operating position with resultant breakage.

Essentially it is our improvement to interpolate into the circuits of the magnetic clutch switch of said Freeman machine, a normally open switch that is closed only when the press plunger is in its nal position at the close of an operation. This mechanical arrangement can be operated either directly by the plunger itself or'by the mechanism which controls the plunger. For simplicity, we have illustrated the device as energized directly by the plunger.

In the drawings:

Figure l is a side elevation of the machine.

Figure 2 is a front elevation thereof.

Figure 3 is a detail plan View partly in section showing the plunger shaft clutch.

Figure 4 is a perspective of the plunger operated switch.

Figure 5 is aperspective diagram to show the wiring connections.

Figure 6 is a detail plan view partly in section of the magnetic'clutch.

Figure '7 is a detail elevation, sectioned on the line 1 1 of Figure 6 to illustrate the switch operating finger and cam for the magnetic clutch.

Of the drawings it should be noted that parts of the complete mechanism have been omitted for simplicity in showing the particular feature of the present invention and parts immediately involved therewith. For a more complete illustration and description of the machine we refer to the said Freeman Patent No. 2,241,398.

The machine frame (see Fig. l) is indicated Vat l, the plunger, which serves also as a work support at 2, and the die carriage at 3. In this machine thedie carriage moves in a horizontal plane and the plunger rises on its work stroke pushing the work against the die. The drive of the machine is from a source 4, which may be an electric motor, driving by belt 5 a main drive pulley and fly wheel structure 6, which in turn drives from a smaller pulley by means of a crossed belt 1, a drive pulley 8 for the die carriage operating device.

Referring to Figure 3, the drive for the plunger from the shaft 9 on which the drive pulley and fly wheel 6 are located is by means of the pulley IU formed by the hub of the ily wheel which drives the cross belt 1, which pulley has a lateral pocket Il Keyed to the shaft 9 is a clutch hub arrangement I2, in which is supported a sliding key or block I3 urged by a spring I4 to position The carriage will be moved back to 3 of pressing against the lateral edge of the pulley I9. To hold the key or block out of mesh position with the lateral pocket Il, a latch finger I5 is provided which engages in a groove in the key, that is exposed between the two disk portions of the clutch hub in which the key is mounted. The groove is such that when the latch nger is in its normal spring biased position it will lie in the path traversed by the key and will wedge it back from mesh position.

A tripping mechanism I6 (Fig. 1) will trip the latch, releasing the key which will then be caught by the lateral pocket, and the shaft 9 will be rotated. At the completion of a full rotation the plunger will have been raised and lowered and the latch which will only be tripped and then released will lie in position to .pull the key out of mesh.

The die carriage operates this tripping mechanism, through the medium of a lever |1, and link I8. The lever is on a rock shaft I9 which carries a finger 29 over which an abutment on the die carriage rides, to depress the finger and rock the shaft, thus tripping the latch. The position of the carriage at this point will be at the end of 'ts first half of movement which will bring it to a proper position to impress the work arranged on the top of the plunger.

The die carriage is moved by a crank disk 2|, and link '22 (Fig. 6) the link being connected to the carriage as indicated on Figure l at 23. A half revolution of the crank disk will bring the carriage forward to its operation position and the completion of the revolution of the crank disk will bring the carriage back again. A magnetic clutch generally indicated at 24 drives a pinion 25, which through a gear 26 drives the crank. (Fig. 6.)

The magnetic clutch embodies a movable plate 21 of magnetizable material (soft iron), which is drawn toward a member 28 constantly driven by the crossed belt 1 when an electromagnet 29 within the member 24 is energized. A spring 30 biases the magnetizable disk, and tends to force it against the xed face of a brake member 28a. The disk member is on a hollow shaft or sleeve 28D on which the pinion 25 is formed. As a result when the circuit is closed to the magnet the crossed belt 1 will drive the crank and when the current is disconnected from the magnet, the crank will stop its movement.

There are two switches for the magnetic clutch magnet. The switch 3| (Figs. 5 and 6) and the switch 32. There is also a third switch which is connected in with the paper feed of the machine, which has not been illustrated.

The switch 3| is operated initially by a foot treadle to start up a cycle of operations of the machine. The switch 32 is operated initially by a cam on the clutch hub driven by the shaft 9 for the plunger.

As shown in the Freeman patent referred to there is a rock shaft 33 located along the top of the magnetic clutch structure which is connected by an arm and link 34, with a slide bar 35 at the top of the machine frame. This slide bar is operated by a linger 36 on an arm 31 which is connected to a trip mechanism 38. The foot treadle 39 operates this trip mechanism.

The spindle for the crank disk 2| has located thereon a cam 40 having pins 4| and 42 thereon. Located on the rock shaft 33 that is to be tripped by the slide bar 35- is a rocking ringer 43 having a tail 43a. (Figs. 6 and 7.) When the rock shaft 33 is energized the linger 43 (Fig. 7) moves counterclockwise, pressing against one of the resilient contacts of the switch 3| closing the switch. This sets the crank shaft spindle into motion and also the cam 40 which is to one side of the finger with its pins in position to engage the finger. Cam 4] (also counterclockwise in Fig. '1) engages the movable switch element and holds it closed, and pin 42 moves around under the finger 43 until it strikes the tail of the nger whereupon it moves the finger, resetting the rock shaft 33, slide bar 34, etc. The cam keeps the switch closed, however, until one half revolution of the crank has taken place, whereupon the cam disengages, the switch opens, the magnet releases the magnetic disk 21 and the crank and carriage comes to a stop. At this juncture the pin 42 on the cam 40 will have moved to a position which underlies the tail 43a of the rocking finger 43 and will prevent any switch operation by means of the operating treadle.

It is at this juncture that the die carriage causes the drive shaft clutch to move to operating position and while the carriage stands still, the plunger will move up and back again.

When the plunger reaches the termination of its stroke a cam nose |2a on the clutch hub I2 will engage a rocker 44, held with a lost motion and spring device 46 to an arm 45. The arm 45 is connected by a link 45a with the shaft 41 which has a finger 48a. (Fig. 6), thereon located so as to engage the switch 32 for the magnetic clutch coil.

The result of the cam nose engagement will then be to start up the magnetic clutch and to hold current on the coil until a cam 48 on the gear and crank disk spindle (Fig. 6) pushes the arm 45 back to starting position again and permits the switch 32 to open. The entire machine (so far as concerns the parts described) has then completed its cycle.

As stated in the introductory material, the mechanical and electric features now described are shown in the Freeman patent noted, and the present invention is intended to avoid a condition where the press plunger may because of some defect in operation, continue to reciprocate until power is shut off from the machine. In the described mechanism the carriage will continue on its return movement while the plunger is moving up and down against it.

To -avoid this, in the present example, a switch 49 is provided having resilient contact arm 49a. This is located at the front of the machine frame I below the press plunger. An abutment plate 50 (Fig. 4) mounted fixedly on the bottom of the plunger, is so proportioned and located that when the plunger is in its lowermost position and at rest, the switch will be closed. Only in this position will the machine function to supply current to the coil of the magnetic clutch that supplies power to the die carriage.

In the wiring diagram Fig. 5 the parts have been numbered where they have been described. The power input line 5| is connected to the front contact of switch 3|; and the back contact of the switch 3! is connected to one terminal of the magnetic clutch 24 through lead 54. The other terminal of the magnetic clutch is connected to power line 52 to complete the circuit. The back contact of switch 3| is also connected to the back contact of switch 32. The lead 53 connects to the front contact of the switch 3| with the back contact of switch 49, while the front contact of switch 49 is connected to the front contact of switch 32 by lead 55. Switches 3|, 32 and 49 are all normally open switches. Thus, when the switch 3| is closed, power will flow to the magnetic clutch through line 5|, switch 3 |A and line 54, leaving the clutchthrough line 52. Switch 32 is also used to supply powerto the clutch 24, but in order for the power to reach the clutch it must rst pass through line 53 to switch 49 and then through line 55 to switch 32. Thus even if the switch 32 is closed, no power will flow to the clutch unless switch 49 is also closed. There would be no reason for also disenabling the switch 3| by ymeans of the switch 49, but this could be done without other modification. For that matter the input line 52 could be connected to the magnetic clutch through the switch 49, if desired.

In operation, the machine is activated by the operator stepping on treadle 39 which causes iinger 43 to close switch 3| which closes the circuit to the magnetic clutch 24. The energized clutch drives the die carriage 3 through pinion 25 and gear wheel 2B. Shafted to the gear wheel 2B is a cam member 49 which rotates with gear wheel-26. The cam member contacts switch 3| and holds it in closed position until the die carriage has reached the extent of its forward movement whereupon the cam 40 releases switch 3| thus causing the clutch to be de-energized and the carriage halted. As the carriage reaches the extent of its forward motion it trips a mechanism which causes the drive shaft clutch to move to operating position moving the plunger up into contact with the halted carriage and back down again. Switch 49 is positioned beneath the plunger so that the plunger will close the switch only when in its rest or fully lowered position. During the stroke of the plunger the switch 49 is open and it is impossible for the die carriage to be moved. When the plunger completes its stroke and comes to rest, the switch 49 is again closed. Although switch 49 is closed, switch 32 must also be closed before the clutch will be energized to return the carriage.

The drive shaft clutch is a one-revolution clutch having a cam nose |2a on its hub which engages a rocker 44 and arm 45 as the clutch reaches the end of its revolution. The arm will cause nger 48a to engage and close switch 32 for the magnetic clutch, and the clutch, when again energized, will cause the return of the die carriage to the rest of starting position. A second cam 48 shafted to gear wheel 26 acts to withdraw the nger 48a and release switch 32 to deenergize the clutch when the carriage again reaches the starting position. It will be remembered that both switch 32 and switch 49 must be closed to complete the circuit. This means that the plunger must be in its rest position and must remain there in order to return the die carriage to its starting position.

If the plunger continues to operate for any reason and does not stop at the end of one stroke, even though the switch 32 is closed, the switch 49 will open the instant the plunger leaves the starting position, thus opening the power circuit and de-energizing the switch so that the carriage will not be moved.

The result of uncontrolled reciprocation of the plunger will be to close the switch 49 momentarily, but this momentary closing will not be su'lcient to result in an operation of the carriage sin-ce before the magnet could be brought into sufficient operation to move the magnetic clutch plate to position, the current to the coil would be discontinued.

If the switch 49 were not provided and the plunger continued to reciprocate instead of making just one revolution, it would strike the die car- 6 riage as the latter was in the midst of its return stroke with resultant breakage. Should the plunger continue to reciprocate in the machine of this invention the die carriage will be held in operating position where' repeated contactwith the plunger will cause no damage, the plunger continuing to reciprocate until the power driving the plunger is shut off and the machine stopped. The failure of the die carriage to return gives notice to the operator that thevmachine is not operating properly and that repairs or'adjustments shouldbe made before continuing operations.

Having thus described our invention, whatwe claim as newy and desire to secure by Letters Patent is:

l. In a device of the character described the. combination of a die carriage movable vfrom a res-t position to and from a position for operation on a piece of work, a plunger movable from a rest position into and out of contact with the die on said carriage to effect a die operation when the carriage is in operative position, power means for moving the plunger through its complete movement initiated by the movement of the die carriage into operative position, power means for moving the die carriage, a magnetic clutch for the carriage power means, switch means for supplying current to said clutch, means to close said switch, and a switch operated by the plunger which cuts current from the said magnetic clutch t all positions of the plunger except its rest posiion.

2. In a device of the character described the combination of a. die carriage movable from a rest position to and from a position for operation on a piece of work, a plunger movable from a rest position into and out of contact with the die on said carriage, power means for moving the plunger through its complete movement initiated by the movement of the die carriage into operation position, power means for moving the die carriage, clutch means for supplying movement to the die carriage, clutch means for supplying movement to the plunger, means operated by the die carriage upon its movement into operative position to operate the plunger clutch means, means operated by the plunger clutch means to operate the clutch means for the die carriage when the plunger reaches rest position after a to and from movement, and means operated by the plunger to disenable the said die carriage clutch means, except when the plunger is at rest in said home position, and manual means for operating the die carriage clutch means for moving the carriage into operation position.

3. The combination of claim l in which manually operated means is provided for closing the switch means for the magnetic clutch, said means arranged to open said switch when the carriage has moved to operative position.

4. In a machine for the purposes described, a die carriage movable from a rest position to and from an operative position., power means for moving the carriage, a magnetic clutch for the carriage power means, switch means for supplying current to the magnetic clutch to move the carriage into operative position, a plunger movable from a rest position into and out of contact with the carriage while said carriage is in operative position, power means for moving the plunger through its complete movement initiated by the movement of the die carriage into operative position, means activated by the plunger power means at the completion of the plunger movement to supply current tothe magnetic clutch to return the carriage to its rest position, in combination with a switch operated by the plunger which cuts current from the magnetic clutch at all positions of the plunger except its rest position, said magnetic clutch being characterized by a time lag whereby the momentary closing of said switch will fail t0 cause movement of the die carriage.

5. In a device for the purposes described the combination of a die carriage movable from a rest position to a Work operative position and return, a plunger movable from a rest position into and out of contact with the die on said carriage, power means for moving the plunger through its complete movement initiated by the movement of the die carriage into operative position, power means for moving the die carriage, clutch means for supplying movement to the plunger, means operated by the die carriage upon its movement into operative position to actuate the plunger clutch means, means operated by the plunger clutch means to actuate the die carriage clutch 8, means when the plunger reaches rest position after its complete movement, and switch means operated by the plunger to disengage said die carriage clutch means except when the plunger is at rest in its rest position, said switch means being normally an open spring biased switch positioned beneath said plunger and closed by an abutment plate mounted to said plunger.

' HOWARD H. HOFFMAN.

JOSEPH G. HERBERS.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,990,598 Freeman Feb. 12, 1935 2,241,398 Freeman May 13, 1941 2,268,585 Freeman Jan. 6, 1942 2,277,363 Herbers Mar. 24, 1942

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