US 3154201 A
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Description (OCR text may contain errors)
Oct. 27, 1964 F. W. BUSCH DELIVERY TABLE FOR PILINGSHEETS Filed April 2'7, 1962 3 Sheets-Sheet 1 Fig. 1
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Oct. 27, 1964 F. w. BUSCH 3,154,201
DELIVERY TABLE FOR PILING SHEETS Filed April 27. 1962 3 Sheets-Sheet 3 Inventor Friedrich W. Busch,
Attorneys United States Patent 3,154,201 DELIVERY TABLE FOR Tl'LTN-G SHEET Friedrich Wilhelm lduseh, Dusseldorf, Germany, assignor to Siernag Siegener Maschinenhau G.rn.h.H., Dahlbrazch, Germany, a corporation of (Germany Fiied Apr. 27, 1962, Ser. No. 199,545 4 iilaims. (Cl. 214-6) This invention relates to a delivery table for lifting sheets from a conveyor and depositing them on a piler table.
For some time past piler devices have been used for piling of sheets or similar bodies which are thin-walled in relation to their surface size that are brought to the piling location by a conveyor of known type. The conveyor may move the sheets to the delivery table in regular or irregular succession. Many devices for removing sheets from the conveyor so that they may be piled one on the other have been proposed. In one case the sheets are supported at opposite edges until they are above the piler table; then they are released by the supporting links and can fall freely down on the piler table. For the piling of hot rolled thin sheets, such piler devices are not suited because the sheets can sag in an undesirable manner and drop prematurely. Another familiar type of piler device which likewise cannot find application with the piling of hot rolled sheets uses magnets which lift the sheets from the conveyor and release them above the piler table. Another device deposits the sheets to be piled on a grate-type support which is then drawn out from under the sheet causing the sheet to bend down on the pile as the support is removed. The disadvantage of such piling devices is obvious and consists essentially in the fact that, particularly with heavy and large surface sheets, a considerable friction occurs between them and the support, which results in high wear and tear and, on occasion, an undesirable damaging of the sheet surface.
The above disadvantages have been removed somewhat through the use of a delivery table in which rails lying between the conveyor rollers are raised to lift the sheet from the rollers and then move it laterally toward the piling table position. The delivery table is simultaneously tilted so that the sheet slides off to land on the table. However, since the position of the rails when tilted is always the same, the extent of the drop of the sheet to the piler table varies. If a high pile of sheets is desired, the distance of fall of the first sheet to the table is so great that it and some of the subsequent sheets may be deformed in an undesirable manner.
The present invention aims at the improvement of a delivery table for the lifting off of sheets, particularly heavy plates, from a conveyor and for the depositing of the sheets on a piler table situated laterally of the conveyor. The delivery table is lifted above the conveying surface by a driven crank arm and is then driven laterally toward the piler table and is placed in tilted position thereabove in such a manner that the height of drop of the sheets running oi the delivery table to the top of the then-existing pile of sheets always remains the same. The invention, therefore, consists of the construction in which the delivery table is guided to the side of the conveyor toward the piler table by means of sliding rails on rollers which can be adjusted in height corresponding to the increased height of the pile of sheets. This change in height of the delivery table may be accomplished by automatic adjustment of the rollers vertical position. The height of the rollers may be increased by gearing actuated by a pawl and ratchets associated with the crank arm. In this way, the height adjustment of the rollers with the forward motion or return motion of the delivery table can be effected in a simple manner.
3,15%,Zdl Patented Oct. 27, 1964 ice Further, it has proved advantageous according to the invention to suspend the guide rollers in a swinging manner and to couple them flexibly with the adjusting link of the drive by straps. It is also practical to form the delivery table by placing the sheet carrying rails between adjacent rollers of a conveying roller gear bed. The rails are synchronously driven by common drive means in their movement toward and away from the piler table.
In the drawings:
FIG. 1 is a side view of a delivery table in the neutral end position below the conveying surface of a conveyor in the form of a roller gear bed;
FIG. 2 is the same delivery table in side view with a working position in which the lifting oif of a sheet from the conveyor has commenced through initial movement of the crank arm to the right;
FIG. 3 is likewise the delivery table in side view and in a working position shortly after the lifting off of the sheet from the conveyor;
FIG. 4 is the delivery table in side view in the tilted position for the delivery of the sheet to the piler table;
FIG. 5 is a representation corresponding to FIG. 1 of the delivery table at the beginning of the formation of a new pile; and
FIG. 6 is an isometric view of the formation and arrangement of the rails of a delivery table between the rollers of the conveyor.
As a conveyor for the sheets B or similar bodies, thin in relation to the surface size, to be piled according to the model example, a roller gear bed 1 of familiar construction is used with roller gear bed rollers 2. A delivery table 3 is coordinated to this roller gear bed, which table can be driven transversely to the longitudinal direction of the roller gear bed. One can perceive from FIG. 6 that the delivery table 3 can be formed by separate carrying rails 3a, of which each is arranged between two successive roller gear bed rollers 2.
At the back end of one of the carrying rails 34 of delivery table 3, the end of a crank arm 5 is attached through a coupling hinge 8, while the other end of the crank arm 5 is keyed in a foundation pit 6 to a shaft 7a in a bearing 712. A lever 7c is also fastened to shaft 7a. A piston rod 7d of an adjusting cylinder 76 is attached to the free end of lever by hinge pin 71. The cylinder 7e is held in a pivoting manner by trunnions 7g to a bearing mounted on the foundation. A sliding rail 3 is found at the lower side of each of the carrying rails 3a of delivery table 3. This rail has at its under front end a piece 4a which is curved to provide an upward slope. Each of the sliding rails 4 is supported on a roller 25 which is provided with flanges 25a to prevent the lateral sliding 0% of the sliding rails 4. The rollers 25 are freely rotatable on axis 11 which is pivotally attached to one end of the guide link 12, whose other end is pivoted to a horizontal axis 13 in a rigid post. Two straps 14 are pivoted to the bearing axis 11 of the rollers 25 while their other ends are coupled to a pin 16 on the upper end of a threaded spindle 15. The thread of the threaded spindle 15 works together with a nut thread (not shown) driven by a helical gear which is situated in the gear housing 17 and driven by shaft 18. At the free end of the shaft 13, as shown in FIG. 6, there is a bevel gear 26 which meshes with a bevel gear 27. Gear 27 is situated on a shaft 29 along with another bevel gear 28 whereby gear 28 meshes with a bevel gear 30 on a shaft 31. The shaft 31 at its other end has a bevel gear 32 which is engaged with bevel gear 33. Gear 33 is fixed on a shaft 34 together with a ratchet 35. The shaft 34 is in alignment with but independent of the shaft 7a of the crank arm 5. On the crank arm 5 is a pawl 36 which cooperates with the ratchet 35. Through this gear train, the height adjustment of the threaded spindle 15 and related roller 25 takes place in direct dependence on the drive movement of the crank arm 5. Through insertion of an adjustable drive in the gear train, it is possible to change at will the upward adjustment which is imparted to the threaded spindle 15 with each crank arm movement andthereby to match it to the thickness of sheets B to be piled at any given time.
Normally, the delivery table is found in an inoperative position, as is shown in FIGS. 1 and 5; that is, the supporting rollers 9 projecting from the upper surface of the rails 3a lie below the level of the conveying surface of rollers 2. For the delivery of a sheet B arriving on the roller gear bed 1 adjacent the piler table 10, the piston rod 7d is forced from the cylinder 7 e.- The lever 7 c is swung toward the right, and this turns the crank arm 5 toward the right. 'In this way, the coupling link 8 between the crank arm 5 and the delivery table 3 is moved upward toward the right along a circular arc. The delivery table 3 is thereby pushed toward the right with its back end following an upward circular path while its front end is lifted initially by the curved pieces 4:: as they move along rollers 25. Therefore, the delivery table, comprised ofa substantial number of parallel carrying rails 3a, remains substantially horizontal as it moves upwardly to the height of the conveying surface of the sheets, as FIG. 2 shows. In the further course of the drive movement for the crank arm 5, the sheet B is lifted from the rollers 2 (see FIG. 3). The further swinging of the crank arms 5 toward the right results in a continuous upward movement of the back end of delivery table 3 in addition to a shiftingtoward the right in the direction of table 10. Thus the end of the delivery table 3 away from the piler table 10 is lifted much higher than the end toward the piler table 10. Sheet B, as shown in FIG. 4, can roll by gravity off the delivery table to strike the buffer of the piler table 10. Then upon return motion of the delivery table 3 into the initial inoperative position, the depositing of the sheet B onto the piler table takes place.
Through the intermittent operation of the gearing by crank arm 5, the adjusting spindle and the. rollers are raised slightly each time crank arm 5 is swung to the right, thus correspondingly raising the righthand end of delivery table 3. This, of course, gradually decreases the maximum slope of the table 3 but the slope, even when the spindle 15 is at maximum height, will always be sufficient to deliver each succeeding sheet B to the piler table at a substantially constant distance. above the previously piled, sheets.
It is my intention to cover all changes and modifications of the examples of the invention herein chosen for purposes of disclosure which do not constitute departures from the spirit and scope of the invention.
1. A delivery table for lifting sheets or plates from conveyor rollers to deposit said sheets on a piler table adjacent said conveyor, said delivery table comprising a plurality of transversely extending members positioned between and normally below the upper surface of said rollers, means for shifting said members in the direction of said piler table and simultaneously raising the rear ends thereof to tilt said members in the direction of said piler table, rollers supporting and guiding the forward ends of said members as the latter are moved toward and away from said piler table, the maximum angle of tilt of said members being sufiicient to cause a sheet lifted from said rollers to slide by gravity onto said table, and means for raising said supporting rollers as each sheet is delivered to the piler table an amount substantially equal to the thickness of the sheet.
2. A delivery table as set forth in claim 1, and means actuated in conjunction with the member shifting and raising means for automatically raising said rollers step by step an amount substantially equal to the thickness of said sheet whereby the forward end of each member will be progressively raised as the height of the piled sheets increases.
3. A delivery table as set forth in claim 1, said rollers being carried by linkspivotally connected to the raising means and to a fixed part of said table.
4. A delivery table as set forth in claim 1, the said members having an arcuate under portion that rests on said rollers when said members are in inoperative position, said portion curving upwardly toward the forward end of said member whereby upon initial movement of said member in the direction of said piler table, said member will move upwardly in substantially horizontal position until the sheet has been raised from said rollers.
References Cited in the file of this patent UNITED STATES PATENTS