CH219422A - Sheet-working machine. - Google Patents

Description

Sheet-working machine. The subject of the invention is a machine for working sheets, for example a press for cutting Garton sheets with a net, the sheets being transported one by one by pine bars conducted between two endless chains which are alternately driven and immobilized. .

In such machines, it is difficult to achieve both high speeds and perfect precision, both because of the inertia of the masses involved, which opposes the rapid succession of stopping and of walking, as a result of the presence of chains, that is to say of organs that it is impossible to tighten to the point of being able to ensure a precise position of a clamp bar by their intermediary Beul.

The machine according to the present invention can reach high speeds, ensuring the precision of the position of a gripper bar occupying at each stop a predetermined station. For this purpose, drive wheels of the chains are rotatably integral with a coupling member which, by axial displacement, engages or disengages from a motor member, at the same time as immobilization means release or immobilize the chain drive wheels, while at each stop a gripper bar occupies a position in which its ends are in contact with the aforesaid drive wheels.

Freeing the chain drive wheels, allowing them to be actuated by the motor unit; by immobilizing them, an leer assures a well-determined position. As for the clamp bar envisaged, provided it is in contact with said wheels, its position is also well determined, within the sections of chains extending beyond said wheels being likely to present play due to lack of tension or deformation.

The attached drawing shows one form of execution of the machine which is the subject of the invention, given by way of example, consisting of a platen press fed by a feeder distributing sheets of Garton to be cut with a net. .

fig. 1 is a front view of the chain wheel drive shaft; she shows

furthermore 11n double coupling member, 1111 rotary motor member and 11n toothed sector actuating the latter.

fig. `? is, ä. the Position of the near seetor, a section through II-II of fig. 1, when driving the chains.

fig. 3 is a section identical to Gelle in FIG. 2, but during the immobilization of the chains.

fig. 4 shows the dual coupling Forgaw@ drive.

fig. 5 shows one of the chain wheels, 11n section of chain, a bar ä, pins at the pick-up station and other elements described below.

On 11n shaft 1 are cla, two chain wheels, one of which, designated at ?, is visible in FIGS. 2 and 3, while fig. 5 represents the other wheel 3. Each of Ges wheels drags a chain of a pair of chains without the end of Tune is visible at 4 i in FIG. 5. These chains lead between them clamp bars which will be discussed later.

L n seeteur toothed 5, oseillant, eoinmuni qu 11n movement of advancement not @i not ii turn Ges elements. It meshes for this with 11n pinion 6, goes up crazy on the shaft 1, and one face of which has a ring of claws 7, pa, particularly visible in FIG. 3. These claws cooperate, for the entra.inement of the chains, with claws 8 of a sleeve 9, a.xially movable on a toothing 10 of the shaft 1, with which it thus rotates Body in a very rigid manner . By dragging this shaft, it also drags the chain wheels fixed on it. The arrows visible in Figs. 1 and 2 indicate the first direction of rotation performed by the elements described, each time the chains are driven.

Figs. 1 and 2, it is clear that, from sector 5, the movement is communicated to pinion 6, which communicates it to. turn a.11 sleeve 9, which causes Farbre 1 and the chain wheels it supports.

The amplitude of the simple oscillation of the sector in the direction of the arrow, the modulus of its toothing and, in general, all the

ra.pports of transmission of intercalated bodies between sector and chain wheels, are. such, that at each of Ges oscillations, the cha.ines move forward by the desired quantity, that the o11 adniettra here corresponds to 11n complete turn of the said wheels.

Each time this turn is completed, an immobilizes Shaft 1 and returns See 5 to empty ä, its Starting Position. For this, an moves the crankshaft 9 from the folded position shown in FIG. 25 Gelle shown in fig. 3. Its claws 8 ceasing to be in engagement with the claws 7, the first pinion 6 is free to reverse its inarch to allow the first return of the sector, while the face of the sleeve 9 opposite to said pinion engages nur two immobilization claws <B>11,</B> attached to the inachine's bäati 1.2. The shaft 1 and the chain wheels are thus maintained in a very precisely determined position. To give more precision to the progress of the operations described, an give to claws 7, 8 and 11 preferably a shape widened at the base and narrower on the outside, that is to say a trapezoidal cross section, thus facilitating 1 interpenetration.

The displacements of the sleeve 9 in its denx coupling positions will be made by the intermediary of a usual fork, the pads of which will be this one by the circula.ire groove visible in the drawing. It should however be noted that at high operating speeds, for example several thousand displacements per hour, this movement must be, so to speak, instantaneous. The levers generally used to control the fork are, o11 very weak, and flex, o11 well of sufficient resistance, but then of trog Brande inertia. For this reason, it is advantageous to provide the arrangement shown in FIG. 4, comprising 11n rotating shaft 13; of which two arms 1.4, 15 constitute the elements of the fork terminating in pads 16 and 17. 0n can give ä, 11n such dimensions tree excluding any deformation, sann for this reason that inertia to be overcome at each displacement is troublesome. The arm 18, capable of carrying the pivot of a roller, not shown, makes it possible to drive the shaft 13 by means of a cam imparting to it a positive movement in the two directions of displacement.

The position of a couple of chain wheels being exactly assured at each stop of said wheels, the position of a gripper bar can be determined just as exactly if care is taken to make it stop on the wheels, which will then temporarily serve as a fixed support.

fig. 5, which shows the chain wheel 3 at rest, and the corresponding chain 4 passing over it, also shows, seen from the end, a gripper bar 19, having the same thickness and width as Profile, olle merges with a mesh. Between the wheels, i.e. behind the plane of the design, it can be wider, but it will preferably never be thicker than the chains are high.

Garton sheets to be worked are brought to the bar from the right of the drawing, by strips 20, forming part of a feeder not shown. They are then taken to the left, over a guide 21. The Bar 19 therefore occupies the Sheet Picking station.

Its position is fixed there by the engagement of the two chain ends 22 and 23 between the teeth of the wheel 3, as well as by means of an additional notch 24 and a tenon 25 of the end of the bar, coming from its engage in it. The axis of dhains, by their karting, however ensure better stability in the desired position. The same is of course true at the other end of the bar, the position of which is thus very exactly determined in the direction of transport of the sheets. It could, depending on the tension of the chain, not be in the direction of the height. Under their own weight and that of the Bar, the chains can, in fact, hang downwards, and their axes may not remain in contact with the bottom of the notches intended for them. los receive. The same could be said of the tenon 25 with respect to the additional notch 24. To eliminate this possibility, a mobile table 26, oscillating around an axis the influence of a rod 28, carries a piston 29, subjected to the action of a spring, and intended, like a similar piston located opposite the other end of the bar, to apply the latter in a direction practically ra dial against the wheels. This table leads at the same time the sheets into the clamps of the Bar; It disappears by lowering as soon as the chains start running again, in order to leave free Passage to the next Bar which, after a complete revolution of wheels 2, 3, comes to occupy <RTI ID="0003.0273" WI=" 18" HE="4" LX="1204" LY="744"> exactly the place of Bar 19.

Preferably, provision will be made for a loose arrangement of the clamps, staggered over the entire length of the Bar, where the elevation of the table 26 causes it to open each time, the Garolles must be open to receive the sheets. Stops of the table can for this purpose encounter a gripper element and lift it.

In this Gas, the order of operations would be the following: The moving chains bring in a Bar, the table being lowered, then the chains and Bars stop in the Position represented, the table rises, centers the Bar exactly in 1 pressing against the wheels, opens the grippers, the feeder introduces a sheet into the open grippers, the table lowers, the grippers close, seize the sheet, the movement of the chains then causes the transport to the machine tools , And so on.

The sheet being margined when it penetrates the grippers, it is necessary that the closing of the last Ges nikes takes place before the piston 29 leaves the Bar, to avoid any relative displacement between sheet and Bar.

The Gentrage of the Bar could also take place by means of members rising and lowering and penetrating into corresponding openings of the Bar, for example by pins penetrating into holes, los ones and the others preferably slightly squeaky. <B>It</B> is finally obvious that the table, the; means., centering and the means used to cause the opening of the clamps could be independent of each other, each controlled by a different body. But between all the operations carried out by the organs enumerated in this description, it must naturally '# have a desmodromic link, as is the case for any mechanism working automatically:.

Claims (1)

CLAIM: Machine working trans sheets carried one by one by gripper bars driven between two endless chains which are alternately driven and immobilized, characterized in that trailing wheels of the chains are rotatably soli - daireq of a coupling member which, by axial displacement, engages or disengages from a motor member, at the same time as immobilizing means release or immobilize the chain drive wheels, and in that at each stop, a gripper bar occupies a position in which the ends are in contact with the aforementioned driving wheels. SUB-CLAIM S 1. Machine according to claim, characterized by a double coupling member which, by axial displacement, engages: sometimes with a fixed immobilization member, sometimes with a rotating motor @orbane. ?. -Machine according to claim and sub-claim 1, characterized in that the double coupling member is a sleeve comprising claws on its two faces intended to come into engagement, one with the immobilizing member , the other with the motor organ. 3. -Machine according to claim, characterized in that the driving wheels of the chains, rotatably integral with the gold--a.ne coupling, are arranged, at the rate of one per chain, on a shaft common to the coupling member, and in that to. each time these wheels stop, a bar occupies a position in which, placed parallel to the aforesaid shaft, its ends are each in contact with one of the wheels. 4. Machine according to claim, charac terized in that each bar, when it comes to occupy the position in which its ends are in contact with the driving chain wheels. is centered there by the action of ortanes momentarily approaching the shaft and entering corresponding openings in the bar. 5. DMachine according to claim,<B>ca-</B> characterized in that each bar, when it comes to occupy the position. in which its ends are in contact with the driving chain wheels, is momentarily subjected to. the action of pressing members, applying the said bar against the circumference of the wheels. G. 3 Machine according to claim and sub-claim 5, characterized in that <B>the;</B> chain wheels comprise, in addition to the chain teeth, an additional notch intended to allow passage for a tenon of each end of the bar. 7. -Machine according to claim and sub-claims 4 and 5, characterized in that the centering members and the pressing members belong to a common element of the machine, the movement of which is necessary for centering and application of the bars causes at the same time the opening of the clamps of the latter. 8. -Machine according to claim and sub-claim 5, characterized in that due the pressing members belong to an element whose movement necessary for the application of the bars causes at the same time the opening of the clamps of the latter, of such that, in a direction of movement of this element, the clamps close before the application ceases. 9. -Machine according to claim, charac terized in that the coupling member is controlled by a fork carried by a rotary shaft.