US1819673A - Stop mechanism for presses - Google Patents

Description

Aug. 18 1931. I w. CAl/IERON 1,819,673

S TOP MECHANISM FOR PRESSES Filed Sept. 15. 1928 4 Sheets-Sheet l Aug. 18, 1931.

w. CAMERON STOP MECHANISM FOR PRESSES Filed Sept. 15. 1928 4 Sheets-Sheet 2 pfzwerzarx Aug. 18, 19 31 I w; CAMERON v 1,819,673

STQP MECHANISM FOR PRES SES Filed Sept} 15'. 1928 4 Sheets-Sheet s 1931- w. CAMERON 1,819,673

STOP MEcHmIsM FOR PRESSES Filed s e t. 15. 1928 4 Sheets-Sheet 4 I wr i so Fig. 5.

armed Aug. 18,- 1931 PA-TENT OFFICE I WILLIAM'CAMERON, OF CHICAGO, ILLINOIS, ASSIGNOR TO CAMERON CAN MACHINERY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS STOP MECHANISM FOB PRESSES Application filed September 15, 1928. Serial No. 306,255.

30 being fed. These mechanisms operate with varying degrees of accuracy and reliability and are usually disposedin proximityto the feedway and spaced from the dies. Should these mechanisms fail, there would be nothing to prevent an excessively thick or more than one blank being delivered between the dies. The primary object ofthis invention is accordingly to provide a mechanism for automatically stopping the presswhen an excessively thick or more than one blank is fed between the dies. This mechanism may be i used without the above mentioned automatic stop mechanisms or it may be used in conjunction therewith as an added safety devlce or auxiliary mechanism.

Other and further objects of this invention will become apparent as the same becomes better understood from an examination of the specification and claims in connection with the accompanying drawings wherein Fig. 1 is a side elevation partly in section and with the parts cut away of an automatic die press of the type illustrated and described in connection with my prior Patent #1,47 7,- 240 of December 11, 1923.

Fig. 2 is a fragmentary view of the press taken at the line 9-2 of Figure 1 illustrating the parts in normal running position.

Fig. 3 is a similar fragmentary view illustratingthe parts in position upon the occur-.

. ce of a blank of abnormal thickness.

' Fig. 4' is an enlarged detailed view showing part of the mechanism removed.

another part of the mechanism.

Fig. 6 is an elevation of the part shown in Fig. 5.

Fig. 7 is a section taken at the line 7- -7 of Fig. 5 is an enlarged detailed plan view of Fig. 8 is a section taken at the line 8-8 of Fig. 5.

Referring to the drawings more particularly, the reference character 9 represents a frame provided near its top with suitable bearings 11 in which the main power shaft 12 of the die press is j ournaled. The shaft 12 is suitably driven and provided with a fly wheel or a belt pulley 13, and a central crank 14 between the spaced bearings 11, by means of which a cross head 15 is reciprocated in the guideway 16 of the machine frame to reciprocate the upper die 17 to co-operate with the stationary lower die 18 mounted on the bed of the machine. The blanks of tin or other material to be operated upon are adapted to be disposed in a pile in the magazine (not shown) from which they areto be lifted in succession by a series of suction cups (not shown) into alignment with the feed channel, whereupon they are moved laterally edgewise into this channel by a suitable transfer-ring device. The blanks arethen fed along the channel to the dies 17 and 18 one at a time by a feed slide 19,.which is provided with a series of dogs 21. The operation of the aforementioned parts will be clearly understood from an examination of my aforesaid prior Patent #1,477,240, and my prior Patent #1,277,342, of August 27, 1918.

Should more than one or an excessivelythe operation of the automatic stop mechanism hereinafter described.

A laterally projecting lug 22 is provided on the wheel 13 near its outer periphery. This lug is given a lateral movement upon the temporary distortion of the shaft 12 by the abnormal blank or number of blanks between the dies, and this movement is appreciable by reason of the spaced position of the wheel 13 from the crank 14, and also by reason of said lug being positioned so far out on "the radius of said wheel.

Normally this lug 22 is carried by the wheel 13 out of contact with the mechanismadapted to be actuated by said lug, to cause the stopping of the press, but when this lug is given the lateral movement just described, it engages said mechanism which will presently be described.

A hand lever 23 is fixedly mounted on a shaft 24 and has an extension 25 pivotally connected with a link 26. This link is adjustably connected to a rod 27, which in turn is connected to a clutch shoe 28 for stopping the press. These parts 23 to 28, inclusive, wherey the handle may stop or start the press are substantially the same 'as shown in my prior Patent #1,47 7 ,240, above mentioned.

A laterally extending arm 29 is pivotally mounted on a pin 31 carried by a bracket 32, which is bolted to the frame at the side of the guideway 16. This arm 29 is pr ovided with a renewable projection 33, at its outer end, adapted to be engaged by the lug 22 as the same is rotated and given its lateral movement previously described. When the lug 22 engages the projection 33, the arm 29 will be actuated downwardly. The arm 29 is apertured to receive the upper end of a rod 34 and is adjustably connected therewith by means of nuts 35.

The lower end of the rod 34 is 'pivotally connected to a lever 36. The lever 36 is pivotally mounted on a pivot 37 in the form of a bolt attached to the frame of the machine in proximity to a guideway 38 also attached to said frame. The outer end of the lever 36 is provided with a handle 39, whereby the lever may be manually actuated as well as automatically by the rod 34 when the arm 29 is actuated by the lug 22 .as previously described. The inner end of the lever 36 isin the form of a projection or stop 41, which normally extends into the guideway 38 in engagement with a shoulder 42 on a slide 43 in said guideway. A spring 44 normally holds the lever 36 in position to cause the stop 41 to engage the shoulder 42 and is adapted to yield under action of the rod 34 and arm 29 when the same is actuated. v

A link 45 is pivotally connected at one end to the slide 43 and at its other end to the extension 25 whereby action of the slide. in one direction may. cause parts 23 to 28, inclusive,

previously described to be actuated for stopping the press. A spring 46 secured at one end to the link 45 and at the other end to the.

frame tends to move the slide to cause it to actuate the said mechanism comprising parts 23 to 28, inclusive, for stopping the press, but so long as the stop 41 is in engagement with the shoulder 42, this is prevented.

' operation upon the occurrence of a blank of abnormal thickness 'the movable 05 die will notbe able to make the full normal movement and will accordingly springshaft '12. The springing of shaft 12 will cause a deflection of the fly wheel or belt pulley 13 which will in turn cause lug 22 to strike arm 29. Movement of arm 29 will actuate lever 36 to withdraw stop 41 from shoulder 42 whereupon spring 46 will automatically move slide 43 to throw the clutch shoe 28 and stop the press.

In order to provide for a fine regulation and adjustment of the spacing of the projection 33 on the arm 29 from the lug 22, I

the pivot pin 31 (Fig. 4) on which the arm 29 is mounted is cccentrically formed between its bearings. Angular adjustment of the pin will therefore regulate the spacing of the member 33 from the wheel 13, and incidentally the lug 22 carried thereby. Adjustment of the pin may be accomplished by a wrench or tool shaped to fit the squared head of said pin which is locked in the desired position by clamping bolts 47 adapted to compress the split bearings within which the pin is mounted.

The advantages and operation of the aforedescribed mechanism will be apparent without further description.

I am aware that many changes may be made without departing from the principles of this invention. I, therefore, do not wish to be limited to the details shown or described.

I claim:

1. In a die press, the combination of a rigid frame, a stationary die seated therein and a movable die reciprocable in said frame toward and from said stationary die, with means for stopping said press operable in accordance with the difference in movement of said movable die with respect to said frame and stationary die resulting from excessive resistance to the movement thereafter le die mounted therein and a drive shaft journalled in said frame for actuating said reciprocable die, with means operable by the springing of said shaft for stopping the press when material of unusual thickness has been delivered between said die members.

3. In a die press, the combination of a ri 'd frame, a stationary die and a reciproca le die mounted therein, a drive shaft for operating said reciprocabl'e die and a wheel on said shaft, with means actuated by said wheel for stopping thepress when the. die members encounter material of abnormal thickness.

4. In a die press, the combination of a rigid frame, a stationary die and a recipro- 1e die mounted therein, a drive shaft for operating said reciprocable die and a wheel on said shaft, with means for stopping the ress actuated by the deflection of said wheel om its normal plane of rotationcau'sed by the die members encountering material of abnormal thickness.

5. In a die press, the combination of a rigid frame, a stationary die and a reciprocable die mounted therein, a drive shaft for operating said reciprocable die and a wheel on said shaft, with means for stopping the press actuated by the deflection of said wheel from its normal plane of rotation caused by the die members encountering material of abnormal thickness, said means compris ing a' trip mechanism operable to disengage the drive shaft from the. source of power.

6. In a die press, the combination of a rigid frame, a stationary die and areciprotion thereby, and means rendered operable cable die mounted therein, a drive shaft for operating said reciprocable die with releasable mechanism carried by said shaft for stopping said press rendered operable by the spnngingof said shaft when the die mem bers encounter excessive resistance to their relative movements.

7. The combination of ary die and a rotatable shaft carried there by, a reciprocable die connected to said shaft for actuation thereby, and means rendered operable by deflection-of said shaft induced by excessive resistance to movement of said reciprocable die for causing cessation of rotation of said shaft.

8. The combination of a frame, a stationary die and a rotatable shaft carried by said frame, a wheel on said shaft, a reciprocable die connected to. said shaft for actuaby deflection of said wheel from its normal plane of rotation induced through said shaft by excessive to movement of said reciprocable die for causing cessation of rotation of said shaft.

the foregoing aifix my WILLIAM CAMERON.

' -In witness of signature.

a frame, a station-

Images