US907690A - Punching-machine. - Google Patents

Description

u. R. HARBECK.

PUNGHING MACHINE.

APPLIOATION FILED JUNE 8, 190a.

Patented Dec. 22, 1908.

4 SHEETS-SHEET 1.

J. R. HARBEGK. PUNGHING MACHINE.

APPLICATION FILED JUNE 8, 1908.

907,690, I Patented Dec.'22, 1908.

4 SHEETS-SHEET 2.

Winn-marrduurulm' J. R. HARBEGK.

PUNGHING MACHINE. APPLICATION II LED JUNE 8, 1906. I

Patented Dec.22,1908 4 SHEBTQ-SHEET 3.

Fag. 4.

UNITED STATES PATENT OFFICE J'ERVIS R. HA RBEOK, OF DETROIT, MICHIGAN, ASSIGNQR TO KEMIWELD CAN COMPANY, OF

DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

mourns-Meow.

Specification of Letters Patent.

Patented Dec. 22, 1908.

Application flled J'une a, 1908. Serial Ho. 437,259;

To ollwhom it may concern:

Be it known that I, Jnnvrs R. Hannnclga citizen of the United States, and a resident of Detroit, in the county of Wayne and State of Michigan, have invented a new and useful Punching-Machine, of which the following is a specification.

My invention relates to presses for cutting out blanks from sheet metal and at the same time forming the blanks by means of punches and dies; and the object of this invention is to provide a machine of this kind which shall be ada. ted to rapidly and effectually turn out suc .products with a minimum expense for labor and material.

M invention comprises a novel punching mac e having an inclined feed table.

It also consists in the novel arrangement of the punches and dies in staggered parallel rows at an angle to the horizontal.

tioning the sheets from.- which the blanks are cut by this multiple system of dies.

It further consists in novel means for removing the finished blanks from the machine, and especiall inthe construction of the punches whic effect this removal.

It further consists in a novel safet mechanism whereby the press is stop e at the end of a redetermined numbero strokes.

It fina y consists in the novel details of construction illustrated in the accompanying drawings in which Figure 1 is a view of this improved press looking down on a line at right angles tothe plane of movement of the cross head. Fig. 2 1s a cross section on the line22 of Fig. 1. Fig. 3 is a view oi the guide plate and stop gage. Fig. 4 is a view of a punched sheet. Fi 5 is a lan of a die. Fig. 6 is a longitudina centra cross section of a punch and die. Fig. 7 is an end view of a punch. Fig. 8 is a transverse cross section on the line 8-8 of imilar reference characters refer tolike parts throughout the several views. a

' In the drawings, the bed 1 of the resshas a frame connected to it consisting of the side pieces 2 and 3, and the cross piece 4. Between the side pieces is a base provided with a main plate 5 and feed table 6. Vertical braces 7 extend from the bed 1 to the side pieces to stiffen the entire construction.

Revoluble in the side pieces is a shaft 8 on; one end of which is the wheel 9 which is both driving end is a the brake band 1 1 in the usual manner. shaft is formed with crank pins which are embraced by the upper ends of the connecting rods 12, the lower ends of which are ball shaped and connectto the cross head 13. Ad usti-ng means are provided as shown in Fig. 1, but this construction just described is well known and.- forms no part of this pres,- ent invention. I

ulley and flywheel. the other Enake wheel 10 which is engaged by The side pieces and 3- are providedwith' guides 14 between which the cross head 13 is slidable, and, as shown in Fig. 2, these guides are at an angle to the vertical and at right angles to the feed tables. Projecting from the sides of this .cross head are bosses 15 in which the unch holders are mounted. The punch hol ers may be slipped up into bores 1n the bosses as shown in Fig. 2, or the bosses It further consists innovel means for posimay be held in position as shown in Fig. 1.

Each punch holder is formed as shown in Figs. 6- and 8 with a cylindrical body 16 having threaded portions to receive the adjusting nuts 17 and 18, and a head 19 which is properly formed to receive the cutting 20- .and the forming disk 21 of the punch. The disk 21 holds the ring 20 in position while it is itself held in position by the screw 22. As the formed blanks are usuall lifted up by the punch, as shown in dotted es in Fig. 6, a rod 23 is provided to discharge the same. This rod is slidably mounted in a central bore of the punch holder, being held upward by the -spring 24 bearing against-the nut 25, the upward movement being limited by the collar 26 on the rod.

When the cross head is reaching the upper end of'its movement, the rodsv 23 will contact with pins 27 carried by the arms '28 projecting from'the cross bars 29 which extend acrossbe-twecn the side ieces'2 and .3. As a result, the rods 23 e depressed and expel the blanks fromthe punches. To- 111- sure the lifting and to prevent these blanks from falling out of the punch before the proper--time, a flexible hose 30 is provided which connects to an air pump and to the pipes 31 The bosses'are formed with passages 32 which connect with the pipes 3-1 and with the upper ends of the passages 33 in the punch holders. I

The dies for this machine are shown in the lower part of Fig. 6 and in Fig. 5 Each is formed by the ring 36 which rests on the The , held up by the pins 38 which connect to the disk 39. A bolt 40 extends through the main plateand carries the washer 41, between which and'the plate 5 is placed any desirable resilient member, a rubber spring 42 referred. Y

he rings 20 and 36- are the male and female shear members and the disks 21 and 37 the female and male forming members respectively. All four should be of tempered steeL' -When the punch descends, the ring 20 1 passing into'the ring 36 cuts out a fiat bla Continui down the flat blank is pressed between the isks 21 and 37, forming it as shown in dotted lines at the lower edge of the ring 20. Ordinaril the stiffness of the rubber bumper 42 w' hold up the disk 37 suflicientl to form the depression in the blank. For eavy sheet metal, it may be necessary for the disk 37 to contact with blanks to form the openings 0 in the s the main plate before the necessary-resistance is obtained. 1

When the punch rises, the properly formed blank will generally be wedged into the depression in the end of the punch as shown in ig. 6-, but to insure it rising, the air ducts 33 'are provided. After the punches have reached roper height, the rods 23 will eject the bla s which will fall on the guide plate v44. The press being inclined, the openings in the plate 44 will not be directly under the punches when the blanks fall and the blanks will slide off to the rear as shown in Fig. 2 and are thus separated from the waste.

The usual manner of punching out blanks by means of gang presses, in which the punches and dles are in a straight line at right angles to the feed, is waste 111 because of the necessary wall of the die ring. By arranging the punches and dies in two parallel staggered lines, as shown by the openin s 45 in the guide plate 44, Fig. 3, it is possib e to punch the sheet in the manner shown in As large factories manufacture containers with heads of various sizes, it is economical to first cut out approximately rectangplar (Fig. 4). As sheets delivered by the tin plate mills are'rarely of exact size, it is good policy to cut out the notches I) along the edges so that on the first and last strokes of this machine on each sheet no slivers of metal will be left in the dies to cause breakage on the next stroke of the machine. This cuttin out and notching is performed on a specia machine. The feed table 6 has an o ening throu h which the die rings 36 and p ates 37 may 6 positioned. The space around and bet ween the rings 36 are filled ty means of a plate 48 so that the entire feed table presents a fiat surface over which the sheet may slide. The

' the edges of the sheet are guided by the bars 49 (Fig. .1) secured to the table. The guide plate 44 is mounted on ins 50 carried by the cross head and is hel a ainst these bars by the springs 51, so that in case anything gets out of order or if the waste jams along side or around a punch ring 20, breakage will be avoided, the plate 44 rising freely with unches.

T e feed of the sheet is controlled by a stop mechanism which is mounted on a shaft 54' across the front of the machine and comprises a finger 55. A spring 56 holds down this fin er, a handle 57-on the outer end of the sha t enablin the operator to raise the finger at will w 'ch finger passes down through an opening in the plate 44 as shown in li 3. T e sheet in 1' 1g. 4 is shown upside own. The operator first lifts the finger and slips the sheet down the table and lowers the finger into an opening aso that the sheet rests against the finger. The machine then operates: cutting out the blanks to form the openings 0 lig. 4. On rising, the catch 58 on the cross head engages the end of the arm 59, raisingthe finger for an instant, during which time the sheet slips down the incline. The notches I) prevent the second row of punches clipping the edge of the sheet and getting slivers 1n the annular depressions of the plates 37. As the sheet slips, the arm 59 swings out of the 'path of the catch 58 and the finger 55 falls into the middle opening a, stop ing the sheet. The punches then out out t e six openin s (Z, then in turn the openings e, f, g, h, i, an 7'. At the next operation, the first row of punches do not cut as they are at the rear notches b but the rear punches cut the openings 7c. At the next stroke of the machine, the rear line of punches are due to cut down on the sheet around the rear opienings a which would fill the lower dies with, 0

ps. To prevent this a sto mechanism is provided as follows. Journa ed on the in 60 projecting from the side piece 3 is a rate et wheel 61 adapted to be turned one space at each stroke of the cross head by the pawl 62. This pawl is omitted in l. ig. 2 but shown in lig. 1. There is one tooth for each stroke of the machine necessary to complete the cutting out of blanlas from a sheet. A shoulder 63 on this wheel is in the path of the rper end of the'lever arm 64 on the shaft 65. 8n the other end of the shaft is an arm ,66 having a pin which is movable in the slot 67 in the lever 68. This lever is connected to the shaft 69 which carries an arm 70 at its inner end. This arm normally en ages the shoulder 71 on the lever 72, whic lever is connected to the shaft 73, and is also pro= vided with a treadle 74. On the o posite mediatey after by the table, a shearing adaptedto carry the finished b on the hub of the fly wheel. A hand lever 80 connected to the shaft permits the operator to stop the press atpleasure. A spring 81 is adapted to hold the arm against the shoul- 5 der 71.

When the sheet has been placed on the feed table with the finger 55 in an opening a, (the finger 59 beingreleased by pressing back the'catoh 58) the operator presses down the 10 treadle 74 until the lug 71 engages in the notch in the end of the arm 70 as shown in I 'ig. 2

operations. At each stroke of the cross 15 head the pawl 62 turns the wheel 61 one step,

until the shoulder 63 engages the lever arm 64, swingin backthe upper end of the lever arms 66an 68. This causes the arm 70 to swing forward, releasing the lever 72 and er- 2'0 mitting the stop 76 to move intothe pat 1 of the pin 79, stopping the machine. Should r the operator'deslre to stop the machine at anytime, he can do so by prshing back-.th hand'lever 80 to release the lever 72.

The pin 79 is so ositioned that the finger 55 will be in raised position when the press stops. This permits the waste to slide out of the machine. I 1 distance between the end of the finger 55 and 30 the adjacent rnch determines the width of the waste. T' is finger may be d1: plicated if desired. This width ofwaste should be no more than what is necessary to hold the fragments together.

The advantage gained by inclining the table is that the sheet feeds itself down the incline. Where the rows of dies are placed diagonally "to or in linewith the incline, power feeds of some sritable type world be .40 necessary. A- ftrtheradvantage of this inclination of the ress is that, the finished blan s do not fall a'ck into the dies, but fall onto the-gr ide plate and slip out of the machine separately .from the waste.

Having now explained my improvements, what I claim as my invention and desire to secure by Let-terslatent is:

1. In a punching machine for sheet metal, the combinatibn of an inclined tabl'e,; dies 50 mounted thereon in parallel staggered rows,

punches for said dies mounted for movement at right angles to the table, and a stop for contacting with said sheet, means to move the sto out of the path of the sheet im' the end of each stroke of the machine: I

2. In a punching machine for sheet metal,

.the combination of an .inchned table, a

' stationary shearing and orming die carried and forming unch adapted for movement at right ang es to said table, and an inclined plate through which .the unch may ass, means to space 'the plate rom the ta le the unch being ank upward This moves the stop 76 out of the. path of the pin 79 and the machine begins its It will be ob served that the' on the place. Y

the combination of an inclined table, a die carried thereby, a punch movable in a path at right angles to the table and adapted .to lift-the cut out blank from-the same, anda plate for conveying away the blank and meansto support the plate above the table. to permit sheet meta "plate.

the combination of an inclined table, a carried thereby consisting of a shearing ring path at right angles to the table and concorresponding to the forming plate of the die, the punch being adapted'to carry up; theformed blank fromthe die and .an inclined plate upon which the blanks may fall and slide out of the machine and means to hold the plate a distance above the table.

5. In a punching machine for sheet metal,

adapted to lift the severed blanks in their 11 ward movement, an inclined plate above tli 'e feed table and apertured'for the passage of the punch, means to separate the plate and table and means for releasing the blank fIiOm the punch after being lifted above the ate. P 6. A punch for sheet metal comprising a cutting ring, a forming disk within the same, a holder on which the ring and disk are opening through said disk, said air passages adhere to the punch so it may be lifted out of the sheet from which it was cut'.

9. In a punching machine for sheet metal,

die mounted on said frame for movement at right angles to the table, a shaft mounted on the frame, a fin er carried by the shaft'noron the shaft, engaging means mounted to move with the unch and enga e the arm carried by the s aft to lift the ngerwhen the punch is leaving the die.

through said plate and to permit to fall plate'so it may slide to its proper 4..In a punching machine for sheet metal,

mounted, said holder having. air passages connecting with the suction pipe of an air the'combination of a frame, an inclined ta-' ble, a digi'mounted therein, a-punch for sa d.

3. In" a punching machine for sheet metal,

75, to pass below the -and forming plate, a punchmovable in a :sisting of'a cutting ring and a formingplate the combination of an inclined table, a die mounted therein, a complementary punch.

a. suction ,hole for causing the blank to mally in the pet of the sheet metal, an arm path 0 11. In a punchlng machine for sheet metal comprising a punch and die, an inclined table .for the sheet metal, a frame to hold the table at an inclination at which the sheet will slide down the same, a finger in the ath of the sheet engaging one of successive s oulders on the same, means actuated at each operation of the unch to move the finger out of the i the sheet sufiiciently to ermit it to slide, and a spring to return the fiinger to engage the succeeding shoulder.

12. In a punching machine for sheet metal, the combination of an inclined table, a frame for supporting the same at an angle sufficient to permit sheet metal to slide down the same, a punch for cutting blanks from the sheet, a finger extending into the th of the sheet below and in line with the punch, and means to raise the finger at each operation of the punch to permit the sheet to slide, and a spring to return the finger to engage the next succeeding shoulder formed by the punch.

13. In a punching machine for sheet metal, the combination of a frame, an inclined table carried thereby, a punch movable in a path at right angles to the table and adapted to lift the out out blanks'from the same, and a plate s' aced above the line of the feed of the sheet t irough which the unch passes and on which the blank falls an slides away.

14. In a punching machine for sheet metal,

1 the combination of a frame, an inclined table,

a die mounted therein, a punch for said'die mounted in said frame for movement to cut blanks from 'a sheet of metal, the inclination of-the table beingsuch that the sheet will slide down the same, and means for disengaging and reengaging the sheet between successive strokes'of the punch to position thereof, and an apertured inclined plate the punch at the upper part of the movement spaced above the line of the feed of the sheet t rough which the punch passes and on which the blank falls from the punch.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

, JERvis R. HARBECK.

Witnesses:

ELIZABETH M. BROWN, EMMA GREYIIARBECK.

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