US2213914A - Machine for stamping out blanks - Google Patents

Description

Sepf. 3, 1940. HOZA 2,213,914

MACHINE FOR STAMPING OUT BLANKs Filed March 10, 1959 2 Sheets-Shed 1 FIG. 1.

Sept. 3, 1940. J HQZA 2,213,914

MACHINE FOR STAMPING OUT BLANKS Filed March 10, 1939 2 Sheets-Sheet 2 Patented Sept. 3, 1940 UE'E'ED ST'iS Application March 10, 1939, Serial No. 261,131 In Czechoslovakia March 2, 1938 Claims.

directions between an/ inoperative position, in

which the arm is clear of the place where the knife is disposed, and an operative position in which the stamping operation of the arm is performed, the arm then being located above and in register with the knife. The actual stamping operationis performed mechanically under the control of the operator, who is required to couple the presser arm when in the operative position through transmission mechanism to a power drive by manual actuation of a control device. lhus, the power drive-usually an electric-motor drive-serves in these machines to perform solely the requisite depression of the presser arm in the stamping operation. Accordingly, these machines are subject to the disadvantage that the operator is obliged to perform unceasingly throughout his dayswork the comparatively heavy task of swinging the presser arm to-andfro'between the inoperative position and the operative position.

The machines already known are also. subject to a further disadvantage, namely, that the stamped-out edges of the blanks are frequently badly out, the edges not being truly perpendicularly but askew. The cause of this is that the operator, as soon as he has started to swing the presser arm towards the operative position, also starts the downward stamping operatic-n. The result is that the arm while still swinging may engage the knife and tend to force the knife in an askew setting into the material to be cut. Thus the material may be more or less spoilt. Moreover, the knife may be harmed, its cutting edges being readily damaged by rough treatment, th s being especially so as regards double-sided knives, in use of which the presser arm acts in direct engagement with the upper cutting edges.

An object of the present invention is to provide a machine which will be free from the aforesaid disadvantages. 1

Another object is to provide a machine in which not only the stamping operation but also (Cl. Hi l-23) the lateral movement of the presser arm into the operative position will be performed by mechanical power, thereby relieving the operator of the previously necessary manual labour.

Another object is to provide for manipulation 5 by the operator a single control means for setting successively in actuation mechanisms for transmitting from a common source the requisite power to the presser arm for its lateral movement and its stamping movement.

Another object is to provide a brake to automatically maintain the presser arm during the stamping operation against undesired lateral movement from the selected operative position.

Another object is to provide spring means for 15 automatically returning the presser after the stamping operation to its raised position and thereafter to its inoperative position.

Yet another object is so to arrange the main drive, the transmission mechanism therefrom to the presser arm for the performance of the latoral and stamping movements and the control mechanisms for setting said transmission mechanisms in operation all in the interior of the frame of the machine.

Other objects of theinvention will be apparent from the following specification and claims.

A clicking press embodying the invention will now be described by way of example with reference to the accompanying drawings, in which:

Fig. l is a vertical section of the press.

Fig. 2 is a plan of manual control means, the view being drawn to a larger scale than Fig.1.

Fig. 3 is a horizontal section, also to a larger scale, on the line III-III of Fig. 1, Fig. 3 being illustrative of brake means.

Fig. i is a vertical section, toa larger scale than Fig. 3, on the line IVIV thereof.

The frame I of the press incorporates a table whereon the material-supporting block 2 is located, the knife being arranged upon the material when the machine is to be operated. The presser arm or platen 3 which is dimensioned to register when in its operative position with the material-receiving surface of the block 2, is secured fast to a hollow vertical shaft or plunger l which is journalled for rotation and for vertical sliding in the boss of the frame I. The arm 3, as part of the same rigid unit as theyshaft 4, is thus adapted to swing or rotate horizontallyi. e. laterally-to and from the operative position and to move vertically when in said position for the performance of the stamping, or clicking, operation. A single hand-lever 5 is provided on the frame for the operator to control the the control of the operator. pedient for carrying'out this arrangement is to performance of both the lateral swinging movement and the vertical stamping movement under mechanical power. To permit the necessarily different motions of the lever 5, it has a universal mounting at i'! on the interior of the frame i. The requisite driving. power is derived from av motor-driven main shaft I2 journalled in the frame i.

The swinging movement of the arm-and-shaft unit 3, 4 is transmitted from the main shaft if to the arm 3 through the intermediary of the following gearing, namely: a bevel pinion ii keyed to the shaft i2; 2. bevel gearwheel which. is formed as part of a sleeve member i3 and which meshes with the pinion ii, said member being freely journalled on a vertical shaft it; a coupling consisting of a conical friction clutch, one element of which is formed internally of the bevel gearwheel and the other element of which is formed on a vertically slidable sleeve member 'i'on the shaft M, said member 6 having apinand-slot connection at it? with the shaft M; a pinion it fast on the shaft i i; and an arcuate toothed rack iii meshing with the pinion i6 and secured fast to the boss of the arm 3. The said clutch is rendered operative when the sleeve 1 is raised by the action, in the example shown, of an electro-magnet 8 through the intermediary of a link-and-lever system 9 coupled to a collar 'la on the sleeve '5. The winding of the electro-magnet is connected in an electric circuit (not shown) in which is also connected a switch (5 (Fig. 2) in operative association with the control lever 5.

The electro-magnetic means is shown and described merely by way of example, and when energized moves the lower portion of the linkand-lever system 9 to the right as viewed in Fig. 1, causing the upper portion of said system at the end thereof connected with the collar la to swing upwardly in a broad arc whereby the clutch element carried by the sleeve 7 is moved into operative position.

The swinging movement of the arm 3 from the inoperative position to the operative position is performed against the stress of a return torsion spring 22, one end of which is anchored to the frame 5 and the other end of which is attached to the arm 3. The spring 22 continuously strives to maintain the arm 3 in the inoperative position or to return the arm to said position.

The downward stamping movement is also transmitted to the arm-and-shaft unit 3, t from the main shaft 52, the transmission gearing comprising an eccentrically arranged one-revolution coupling !9 which is loosely arranged on the shaft I2 and adapted for engagement therewith and operation thereby and which is secured fast to a pull-rod 20 arranged in and secured fast tothe hollow shaft i. The arrangement is such that the coupling I9, by reason of its eccentricity, is adapted to pull the shaft 4 downwards when rotated, the coupling being set in operation under A well known exprovide a rotary joint connection between the coupling I9 and pull-rod 20. For the purpose of setting the coupling I9 in operation, there is provided in operative association with the control lever 5 a push-rod is acting through a link-andlever system Mia on the coupling I9. The coupling i 9 may be connected with the link-and-lever system IBa in the same manner that it is connected with the pull-rod 29. When the link-andlever system I811 is operated, the coupling I9 is moved into engagement with the shaft I2 to rotate therewith. The downward stamping movement of the arm-and-shaft unit 3, 4 is performed against the stress of a compression spring 2| coiled around the pull-rod 2B and arranged between the-foot of the shaft 4 and the frame I. The spring 2I strives continuously to maintain .the arm 3 in its raised position or to return it filed with cam faces which have convergently inclined portions leading from a lower wider interwall space to an upper narrower inter-wall space.

The rollers 24 are permanently engaged in the device 25 between its walls, and it will be seen in Fig. i that the rollers occupy the lower wider space between the walls of said device, the brake then being inoperative. The opposite ends of the straps 23 are interconnected by springs 27 and separated by a distance ring 28. The springs are coiled on a support having abutments against which the springs press, said abutments being adjustable to regulate the grip of the brake, when actuated, on the brake groove in the frame boss. So long as the arm 3 is raised, the brake-straps 23 exercise no gripping action, and therefore when the raised arm is swung around the axis of shaft 4 the straps and parts thereto connected turn freely with the arm under the constraint of the brake-holding device 25. If however the arm 3 is lowered, the rollers 24 are immediately forced towards one another by the cam action of the walls of the device 25, which moves downwards with the arm 3, with the result that the brake is applied and acts through the rollers 24 and device 25 to hold the arm firmly against lateral movement. Thus, during the stamping operation, the brake ensures that the arm cannot move laterally, the brake acting even to stop any end movement of the arm due to inertia, so that the cutting action is truly straight.

In operation of the press, the material from which the required blanks are to be cut in succession is placed upon the block 2 and the cutter is positioned on the material. The operator presses the lever 5 laterally to operate the switch 6, this action resulting in the lever being displaced into the position in which it is shown in dotted lines in Fig. 2, the contact element 6a of the switch then being engaged to close the electric circuit concerned. Thus, the electro-magnet 8 is energised, the member I is forced upwards to cause engagement of its clutch and the arm 3 is driven by the parts Ii, I3, I, I4, I6 and I5 to swing laterally from its inoperative position towards the operative position. Immediately the selected operative position is reached, the operator depresses the lever 5 so that the switch 6 opens and the mechanical swinging force being transmitted to the arm is interrupted. Moreover, immediately the lever 5 is depressed, it engages and depresses the push-rod I8, and so the eccentric coupling 69 is. actuated by the shaft I2 to force the shaft 4 and arm 3 downwards. Thus, the stamping operation is performed; and simultaneously therewith the descending arm 3 causes the brake 23 to be applied, so that the arm 3 is looked as already described against lateral movement during the stamping operation.

At the instant when the stamping operation is completed, the coupling comes out of engagement with the shaft l2, so that the spring 2! raises the arm 3 to its upper position, the brake 23 thus being rendered inoperative, and the spring 22 returns the arm laterally to its inoperative position. The control lever 5 is returned to its initial position. Thus the parts of the press assume a condition in which they are again in readiness to repeat the entire cycle of operations.

It will therefore be appreciated that not only the movement of the arm into the operative position but also it's return therefrom are performed without manual work on the part of the operator, excepting the light task of manipulating the control lever 5. Thus, there is a considerable saving in manual labour.

It will also be appreciated that, although the entire control is effected by means of a single control lever, nevertheless the two movements of the arm-namely, the lateral swinging movement towards the operative position and the stamping movement in that positionare performed independently of one another from the same source of power, namely, the main driving shaft l2. The return movement of the arm would take place even if no stamping operation were performed; that is, automatic return of the arm from any position is possible.

By Virtue of the manner in which the press op crates, the quality of the work is improved and the wear and tear of the knife is reduced, because a truly straight cutting action is ensured;

and the rate of output is increased because of the customary manual the arm for the performance of the stamping movement, and the two link-and-lever systems actuated under the control of the hand lever if to efiect actuation of said mechanisms are all arranged and housed in the interior of the machine frame I.

I claim:

1. A machine for stamping out blanks, es-

'pecially the uppers of footwear, comprising a presser rotatable laterally from an inoperative position to an operative position and movable downwards in said position to perform a stamping operation, a power drive, mechanism between said drive and said presser for rotating said presser laterally, mechanism between said drive and said presser for moving said presser downwardly, couplings between said drive and the respective mechanisms, a single control means displaceable into different settings to couple said drive through said couplings to said mechanisms successively and thus put the respective mechanisms successively and thus put the respective mechanisms in operation, operative connections between said control means and said couplings to actuate said couplings, brake means connected to said presser to prevent rotationally lateral movement thereof when said brake means is active, and means to render said brakemeans active whenever said presser is displaced down- Wards.

2. A machine for stamping out blanks, especially the uppers of footwear, comprising a presser rotatable laterally from an inoperative position to an operative position and movable downwards in said position to perform a stamping operation, a power drive, mechanism between said drive and said presser for moving said presser rotationally laterally whenever said mechanism is operative, additional mechanism between said drive and said presser for moving said presser downwardly whenever said additional mechanism is operative, couplings between said drive and the respective mechanisms, a single control means displaceable into different settings to couple said drive through said couplings to said mechanisms successively and thus render the respective mechanisms operative, means connecting said control means and the respective couplings to actuate said couplings, spring means to return said presser upwards following downward movement thereof, means to maintain said presser in said operative position during downward displacement thereof, and spring means to return said presser to said inoperative position following upward return of said presser.

3. A machine for stamping out blanks, especially the uppers of footwear, comprising a frame, an upright shaft journalled in said frame for rotational movement and up-and-down movement, a presser arm secured to said shaft so that said arm and shaft constitutea unit, a power-drive shaft, mechanism between said power-drive shaft and said unit for rotating said presser, said mechanism comprising an arcuate rack on said unit, a pinion journalled in said frame and meshing with said rack and gearing driven by said power-drive shaft to rotate said pinion, a friction clutch constituting a coupling interposed between said power-drive and said pinion, additional mechanism between said power-drive shaft and said unit for moving said presser downwardly, said additional mechanism comprising a onerevolution eccentric device and a pull rod connecting said device to said upright shaft, said device embodying a coupling with said power-drive shaft, a single control means displaceable into different settings to couple said power-drive shaft through said couplings to said mechanisms and thus put the respective mechanisms in opera" tion, a linkage between said control means and said friction clutch for actuation thereof, and an additional linkage between said control means and said eccentric device for effecting coupling thereof with said power-drive shaft.

t. A machine for stamping out blanks comprising a frame having a boss, a shaft iournalled in said boss for rotational movement and, up -anddown movement, a presser arm secured to said shaft so that said arm and shaft constitute a unit, a power drive, mechanisms connectible between said drive and said unit for successively rotating said presser and imparting to it a downward stamping movement, control means to effect connection between said drive and the respective mechanisms and thus put the respective mechanisms in operation to move said unit, inter-connected brake straps embracing said boss and restrained thereby against up-and-down movement, rollers on relatively movable ends of said straps, and a device mounted on said unit and movable as a part thereof, said device having cam faces which engage said rollers and which converge upwardly so as to force the rollers towards one another and thus tighten the brake straps on said boss whenever downward movement of said unit occurs, lateral movement of said arm during downward movement thus being prevented.

5. A machine for stamping out blanks comprising a presser rotatable from an inoperative position to selected operative position and adapted to perform an up-and-down movement, a powerdrive shaft, mechanism connectible between said shaft and said presser for rotating said presser, additional mechanism connectible between said shaft and said presser for imparting thereto a downward movement, said additional mechanism comprising a one-revolution eccentric coupling and a pull-transmitting member connected to said coupling and said presser, control means to effect connection between said shaft and the re-- spective mechanisms and thus put the respective mechanisms in operation to move said presser, and spring means acting on said presser to raise said presser after a downward movement has been imparted thereto.

6. A machine for stamping out blanks comprising a frame, a vertical shaft journalled therein for rotational and endwise movements, a presser arm secured to said shaft and forming therewith a movable unit, a power drive, mechanisms connectible between said drive and said unit for successively rotating said presser out of an inoperative position and imparting to it a downward stamping movement, control means to effect connection between said drive and the respective mechanisms and thus put the respective mechanisms in operation to move said unit, means to return said unit upwards following the stamping movement, means for restraining said unit against rotational movement during the stamping and return movement thereof, and spring means acting between said frame and said unit to return said unit rotationally to said inoperative position following said stamping and return movement.

7. A machine for stamping out blanks comprising a frame, a presser mounted in said frame, said presser being rotatable from an inoperative position to a selected operative position and being adapted to perform a stamping movement, a power drive in said frame, mechanisms connectible between said drive and said presser for successively rotating said presser and imparting to it said stamping movement, control means to effect connection between said drive and the respective mechanisms and thus put the respective mechanisms in operation to move said presser, locking means applied to said frame and connected to said presser so as to lock the presser against rotatable movement whenever said locking means is active, and a device for rendering said locking means active, said device being engaged with said locking means and mounted on the presser, and said device being movable with the presser relatively to said looking means to activate the same during stamping movement of the presser.

8. A machine according to claim 7, wherein the said locking means comprises brake straps embracing a part of said frame and rollers on said straps, and wherein the said device is formed with cam faces between which said rollers are disposed and with which they respectively engage, said faces acting to force the rollers towards one another during stamping movement of the said presser.

9. A machine for stamping out blanks comprising a presser rotatable laterally from an inoperative position to an operative position and movable down and up in said position to perform a stamping operation, a power drive, mechanism between said drive and said presser for rotating said presser laterally, a coupling between said drive and said mechanism, control means to couple said drive through said coupling to said mechanism and thus put said mechanism in operation, and operative connection between said control means and said coupling to actuate said coupling, brake means connected to said presser to prevent rotationally lateral movement thereof when said brake means is active, means to render said brake means active whenever said presser is moved to perform a stamping operation, and means for automatically returning said presser to the inoperative position following a stamping operation.

10. A machine for stamping out blanks comprising a presser rotatable from an inoperative position to a selected operative position and adapted to perform a stamping movement, a power-drive shaft, mechanism connectible through a coupling between said shaft and said presser for rotating said presser, said mechanism comprising an arcuate rack secured to said presser, a rotatable pinion meshing with said rack, gearwheels driven by said shaft, and a friction clutch between said gearwheels and said pinion, said clutch constituting said coupling, additional mechanism connectible through a coupling between said shaft and said presser for imparting to said presser a stamping movement, and control means to effect connection through said couplings in succession between said drive and the respective mechanisms and thus put the respective mechanisms successively in operation to move said presser.

JOHN I-IOZA.

Images