US1748063A - Press - Google Patents

Description

1930- O.'DRECHSLER 1,748,063

PRESS 7 Filed March's, 1926 I Z Sheets-Sheet 1 Fig. 1.

/4 a n o 0 Ml} W Wm I! ('[WWdlflfi 54 la y \W[ E y/1 1 a} [0 fig" A INVENTUR 7 Feb.- 25, 1930. Q o. DRECHSLER PRESS -Filed March 6, 1926 2 Sheets-Sheet 2 Patented Feb. 25, 1930 warren STATES PATENT OFFICE OTTODRECHSLER, F SOSSENHEIM, GERMANY, ASSIGNOR TO UNITED SHOE MACHINERY CGRPORATION, 0F PATERSON, NEW JERSEYYA CORPORATION OF NEW JERSEY rnnss Application filed March 6, 1928, Serial No. 92,879, and in Germany Apri1'9, 1925.

This invention relates to improvements in presses and, more particularly, to presses of the typeemployed in dieing out blanks from sheet material such as leather. 5" In the construction of machines for dieing "out blanks such as shoe part blanks from sheet material it'has been common to make some provision for lessening the possibility of injury to the operator. To this end, some machines of the type referred to, in which a Ipresser member for forcing a die through the material, and a work support are arranged for relative movement, have been so constructed that preliminary movement of the I '15 presser vmember toward the work support Just be effected before a poweroperation of the machine can take place, the presser member being moved into such position that the operator cannot throw in the power drive 3 while his hand is between the die" and the presser member or between the die and the work support. 7 i

This preliminary movement or safety stroke of the presser member has been, effected by means of'a treadle'or other controlling member for operating the power drive, the usual construction being such that the preliminary movement. of the presser memher is effected by the first part of the move- 0 ment of the treadle, the parts being so arranged that the treadle. is not efiective to throw in the power drive until the preliminary movement of the presser member has been completed. In machines embodying the safety feature above referred to some form oflmechanismis required for connecting the presser member to the power drive eats the preliminary movement in order to eifect dieing out operations. To this end, certain machines have been so constructed that the presser member is operated by means of a re ciprocating member mounted on a constantly driven eccentric, the reciprocating member being movable into operative position relativel to the resser member b means of a e y P Y spring rendered eiiective by the treadle after the preliminary downward movement of the presser member has been eiiected. After the completion of a power operation, the reciproeating member is returned to lnoperative pofore constructed has been that the reciprocating' members, being of heavy construction,

have relatively large inertia so that their operation by means of springs requires considerable time, thus resulting in machines in which the speed is limited and in which the operation is uncertain. Also, the return of the reciprocating member to inoperative position by means of a stop is possible only after the eccentric has moved past dead center. In machines of a similartype in which the reciprocating member is returned to inoperative position by means of springs, the operation of the machines is uncertain and unreiable.

It is 'anobject of the present invention to provide an improved press in which the above-mentioned disadvantages are eliminated.

- To this end and in accordance with one feature of the invention, in the illustrated machine there is provided a reciprocable power member, a presser member, means for effecting a prellmmary movement of the presser member,novel means comprising a connecting member for coupling the power member and the presser member for effecting pressure operations of the latter, and manually controlled means for rendering the connecting member operative, the construction being such that the connecting member cannot be rendered operative and a pressure operation of the presser member cannot take place until the connecting member is moved to coupling position. The connecting member is preferably of light construction so that it will have low inertia and, consequently, will not slow up the machine. Accordingly, the illustrated member is a light pawl.

Further to insure safety of operation, another feature of the invention consists in novel mechanism for elfecting positive move- Other features of the invention will be apparent from the following description taken in connection with the accompanying drawings and will be pointed out in the appended claims. I

In the drawings,

Fig. 1 illustrates a side view of a embodying the invention;

Fig. 2 shows a part of the machine invertical section;

Fig. 3 is a vertical section taken along line 33 of Fig. 2;

Fig. 4 is a horizontal section taken along line 4-4 of Fig. 2; and

Figs..5, 6 and 7 are views corresponding to Figures 2, 3 and 4,'res'pectively, but show certain of the operating elements in difi'erent positions.

The illustrated preferred embodiment of machine the invention comprises a frame 10 (Fig.1),

a cutting block 12, and a presser member 14 mounted in the frame for reciprocating movement toward and from the cutting block in effecting pressure operations upon a die 16 to produce heel lifts from sheet material 18, such as leather or leather board, supported on the cutting block 12.

The presser member 14 is guided vertically in the frame 10 (Fig. 2) by means of a head 20 and is actuated by a power shaft 22 which is operatively connected to the presser member by means comprising a power transmitting member or ram 24 mounted on the eccentric pivot 26 at the end of the, shaft. -Th'e shaft 22 isadapted to revolve continuously and through the pivot 26 imparts an uninterrupted up-and-down movement to the ram 24. To effect operations of the presser member, a pawl 28, pivoted to a pin 30 on the head 20, is provided. Vhen the ram 24 is in its I upper position the pawl 28 may be swung are depressed.

under the lower end of the ram 24 so that upon the next downward movement of the ram 24 the head 20 and presser member 14 In order to ensure safety to the operator, manually operated means is provided for causing a preliminary downward movement of the presser member into contact with the die, into the position shown by the dotted lines inFig. 1, before the ram 24 can be effective in transmitting power to the presser member 14. To this end, the machine is provided with mechanism for depressing the presser ram 24 upon actuation of a starting treadle 32. Operatively connected to the treadle- 32, by means of a link 34'and a bellcrank 36 is a link 38. The link 38 is provided with anose 40 which engages with a projection 41 of bell-crank 42 pivoted at 44 and having rounded end 46 entering a recess 48 in the head 20. \Vhenthe treadle is depressed, the nose 40 effects a rotation of the bell-crank lever 42 in a counter-clockwise direction into the position shown in Fig. 5, thus forcing the vesoes presser member 14 downwardly into contact with the die 16, so that the operator cannot.

put his fingers between the presser member and the .die. Simultaneously with this movement of the lever 42, a locking device 1s released which up to that time operates to hold the pawl 28 in its inoperative position at one side of the ram 24, as shown in Fig. 3.

The locking devicereferred to comprises a the rod 38 and is provided with a recess in which is engaged one end 54 of the lever 42. i

A spring 56 is provided tending normally to hold the link 38 in raised position with the dog 50 locked in engagement with the pawl 28 (Fi s/2 and 4). The free end of the rod 38 is positioned in a-recess 58 'ofthe head 20 so that upon downward movement of the presser member, the rod 38 is depressed, the dog 50 being withdrawn from engagement with the pawl 28, as shown in Figures 5 and 7.

Springs 60 are provided for returning the presser member 14 to raised position after a downward movement thereof.

Mechanism is also provided for ensuring that the pawl 28 shall be moved out of its,

position for engagement with the member 24 at the termination of an operation of the presser member. To this end, the illustrated machine is provided with a link 62 pivoted to'the pawl 28 and connected to a lever 64 pivoted about a fixed axis66. The upper end of the link 62 carries a roll 68-which, by means of a spring 70, is held against a cam 72 mounted at the end of the eccentric pivot 26. The shape of this cam is so selected that'the pawl 28 is moved laterally, immediately after the completion of an operative stroke of the presser member, into the position shown .in Fig. 3. The rain 24 is provided with a slot 7 4 adapted to receive the link 62 on subsequent downward movements of the member without efiecting a movement of the link.

The operation of the machine is as follows When the treadle 32 is depressed, the link 38 is pulled in the direction of the arrow (Fig. 2) so that the nose 40 causes the movement of rotationof the lever 42, which, as stated, effects a lowering of the presser member 14 upon the die 16. Simultaneously,

through the action of the end'54 of the lever and when the ram 24 next moves upwardly out ofthe path of movement of the pawl,

the latter will be swung by means of the spring 70 under the end of the ram, as shown in Fig. 6. Upon the next downward stroke 7 of the ram 24, the latter acts upon the upper end of the pawl 28 to effect a further downward movement of the presser member 14, causing the die '16 to penetrate the work 18, thus forming a blank.

Upon,downward movement of the head 20, the upper wall of the slot 58 acts upon the ro'd38 and pushes the latter so far downwardly that the nose 40 releases the lever 42. The lever 42 is then turned to the right by thespring 56and thus does not interfere with the upward movement of" the head. The treadle 32 may be released at anytime during the operation of the machine and is moved upwardly under influence of a spring 76 (Fig. 1) without being afiected by the parts Operating to lower the presser member.

g Y- Asthe ram 24 moves rearwardly, the cam 72 acts uponthe lever 64 andswings the pawl QS-again into inoperative position, in

which position it is held by the dog under the influence of the spring 56, independently of the movement of the presser member.

; Having thus described my invention,

whatl claim as new and desire to secure by Letters Patent of the United States is:-

Q 1. In a machine of the class described, a

reciprocable power member, a presser member, means foreffecting a preliminary move "ment of the presserf'member, a connecting member for coupling the power member and the presser member for 'effectlng pressure operations of the presser member, said j connecting member being constructed and arranged for movement into and out of op- I erative positionflbetween thepower member and the presser member, and manually controlled means for rendering the connecting necting-member into operative position,

member; operative.

2. In a machine of the class described, a

reciprocable power member, a presser member, a connecting member movable into 0perative position between the said members for coupling the presser member andthe power member, means for moving the conci L means under manual controlfor effecting a preliminary movement of the presser member before the means for moving the connecting member into operative position be comes operative.

. v 3.- In a machine of the character described,

a reciprocable power operatedmember, a presser member, a manually operable start ing member, means operable upon actuation of the starting member for operatively connee-ting .the power member to the presser member for effecting an actuation of the a presser member,

latter, and means for positively moving the said connecting means into inoperative position after an actuation of the presser member. v v

4., In a machine of thecharacter described, a pawl pivotally mounted on'the presser member, a shaft, a power 1 member mounted on the shaft and arranged for continuous reciprocation thereby, means formoving the pawl into position between the power member and the presser memberin such manner that the power member ber comprising a shaft, a ram eccentrically mounted upon the shaft, and a pawl movable into operative position between the ram and the presser member, a cam mounted on the shaft, and connections between the cam and the pawl for moving the pawl into inoperative position. 7

' 6. In a machine of the character described, a ram, a presser member, a pawl for opera-' tively connecting the ram, to the presser member, means tending to move the pawl into operative position, means for normally retaining the pawl in inoperative position comprising a dog slidably mounted in a slot in the pawl, and means for moving the dog into and out of the slot.

Cit

7 In a machine of the character described,

to the shaft and arranged for continuous reciprocation thereby, a pawl connected to the presser member, means for moving the pawl intoand out of the path of movement of said ram, the arrangement being such that when thepawl is in the path of the ram the presser member is moved toward the cutting block, and manually controlled means for moving the presser member toward the cutting block independently of the operation of the ram.

8. In a machine of the character described, a frame, a cutting block, a presser member mounted for reciprocation toward and from the cutting block, a starting treadle, means responsive to the operation of said treadle for moving the presser member toward the cutting block, a shaft, a ram mounted on the shaft for reciprocation toward and away from the cutting block, a pawl arranged for movement into position between the ram and the presser member, but normally held in position at one side of the ram, means responsive to an operation of the treadle for ated member to the presser member for effecting an operation of the latter, a shaft for effecting reciprocations of the, power member, manually controlled means for moving the pawl into operative position, means controlled from the shaft for moving the pawl into inoperative position, and means for locking the pawl in inoperative position.

10. In a machine of the class described, a shaft, a ram mounted on the shaft and arranged to be continuously reciprocated thereby, a presser member, a pawl foroperatively connecting the presserf member to the ram for effecting operations of the presser mem ber, means tending constantly to move the pawl into operative position, means operative to move the pawl into inoperative position after each operation of the p'resser member, and means for locking the pawl in inoperative position. 7

11. In a machine of the character described, a work support, a presser member,

power means for moving the presser member toward the work support but normally disconnected therefrom, starting means, means responsive to an actuation of the starting means for effecting a preliminary movement of the presser member toward the work support, mechanism operative after the completion of such movement for effecting an operation of the power means upon the presser member to produce a pressure operation upon work carried by the Support, and means for locking said mechanism in inoperative position after a pressure operation.

12. In a machine of the class described, a shaft, a ram arranged to be driven continuously by the shaft, a work support, a presser member movable toward and away from the work support, a connection movable into position between the ram and presser' member for eflecting pressure operations upon a die carried on the work support, a starting member for initiating a movement of the presser member into contact with the die, and means operable after the presser member has been brought into contact with the die for moving the connection into operative position for effecting a pressure operation of the presser member. r

13; Ina machine of the class described, a shaft, a ram arranged to be driven continuously by the shaft, a work support, a presser member movable toward and away from the work support, a connection movable into position between the ram and presse'r' member for effecting pressure operations upon a die carried on the work support, a starting memi her for initiating a. movement of the presser member into contact with the die, means operable after the presser member has been brought into contact with the die for moving the connection into operative position for effecting a pressure operation of the presser member, and means operative after such imraoes shaft, a power operated membermou'nted for continuous reciprocating movement by the shaft, a work support, a presser member movable toward and away from the work support, a manually controllable member c'on- 7' nected to the presser'member and movable into the path of the power operated member for effecting a pressure operationof the presser member, -means for normally retaining the manually controllable member in inoperative position, means for initiating a preliminary movement of the presser member toward the work support and simultaneously moving the manually operable member into operative position, and means operable after the termi- V nation of a pressure operation of the presser member for. returning themanually operable member to inoperative position.

15. In a machine of the character described,

a cutting block, a presser member mounted for movement toward and away from the cut ting block, a shaft, a ram mounted on the shaft and arranged for continuous up and down movements with respect to the cutting block, a pawl p'ivotally mounted on the presser member between the member and the ram and movable into position beneath the ram to effect apressure operation of the ram upon the presser member, a member normally operative to lock the pawl in inoperative position, a starting trea'dle, a member operatively connected to the starting treadle for effecting a I preliminary downward movement of the. presser member and for withdrawing the locking member upon completion of'su'ch movement, a camon the shaftv for moving the pawl into operative position to effect a pressure stroke of the ram, and means for moving the pawl into inoperative position at the completion of a pressure stroke'of the ram. V In testimony whereof I have signed my name to this specification.

CERTIFICATE OF CORRECTION.

Patent No. 1, 748, 063. Granted February 25, 1930, to

' .OTTO DRECHSLER.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:' Page 1, line 69, after the word "is" insert the words "rendered still more"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 9th day of December, A. D. 1930.

, M. J. Moore, (Seal) Acting Commissioner of Patents.

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