EP1872962B1 - Stapling device for printed products having a ceramic component - Google Patents

Description

The invention relates to a stapling device for stapling printed products, comprising a stapling head having a driver and bender which preform and drive a wire staple through a product backing, and a bender having bendering wings which bend over the open ends of the staple.

Such stapling devices are used, for example, in saddle stitchers for stapling folded sheets. The folded sheets are conveyed in such a saddle stitcher, for example, on a collecting chain on which they rest saddle-shaped. The stapling head is here above the collecting chain and the Umbieger under this. In the stapling head, a wire section at the free ends is bent over with the benders and the two ends are driven with the driver through the product back. Finally, the free ends of the bender are bent by 90 °, so that they finally run parallel to the product back and the clip is closed with it.

A stapling device of this kind is for example from the CH-A-549 443 known. With this device folded sheets can be stapled by Ösenheftklammern. Other stapling devices are in the CH-A-662 987 and the EP-A-0 958 942 disclosed.

Stapling devices of the type mentioned are heavily loaded, especially with regard to the moving and highly accelerated parts. Such parts must therefore be replaced after a certain time. The use of high-quality steel and carbide parts has long been an attempt to reduce wear and thus maintenance and costs. The parts should also have a high dimensional accuracy, in particular with regard to functional reliability. To achieve this, such parts have hitherto been made of tool steel or carbide. Hard metal would be particularly suitable in itself, since the parts made from it last very long. Carbide, however, is brittle and can be destroyed during installation or transport. In addition, these parts are relatively expensive.

From the DE-A-10108332 a wire feeder upstream of a stapling device is known in which the deflection region and / or the wire inlet funnel are made of ceramic.

The invention is based on the object to provide a stapling device of the type mentioned, which avoid the disadvantages mentioned.

The object is achieved in a generic stapling device characterized in that at least a part of stapling device is at least partially made of ceramic. By using parts made of ceramic, the service life can be significantly extended. This especially when highly stressed parts, such as in particular the driver, the bender and the Umbieger or parts of the bender are made of ceramic. Experiments are surprising have shown that such parts have substantially no damage even after 8 million stitches. Another advantage is that due to the higher constant material quality reduced test costs incurred. Since such ceramic parts are not shock sensitive, they can hardly be damaged as compared with a hard metal. If these parts are exposed to a high acceleration, due to the low density compared to steel correspondingly lower forces are exerted. Further significant advantages are the high surface quality, the uniform, constant hardness, the high temperature resistance, the smaller thermal expansion, the uniform structure and the low production costs. Another advantage is that ceramic can be paired with other materials. The parts can thus be made for example of ceramic and steel or carbide.

According to a development of the invention, it is provided that the part made of ceramic is a sintered molded part. This allows a particularly high dimensional accuracy and thus in particular reliability can be achieved. Parts to be replaced are thus perfectly compatible with the old parts.

By a development of the invention, the part is made of an oxide ceramic. With a ceramic part of oxide ceramic, a particularly high resistance can be achieved. This also applies if the part is made according to an embodiment of the invention from a mixed oxide ceramic. Such a mixed oxide ceramic is, for example, aluminum titanate.

According to a development of the invention it is provided that the part of at least two firmly interconnected parts is made, wherein the one part is made of ceramic and the other part made of a different material and in particular steel or hard metal. The ceramic is intended in particular for the areas that are heavily loaded and prone to wear.

The ceramic part is in particular a driver, a folding wing, a bender, a centering foot, a push rod, a wire nozzle, a wire knife or a Drahtabschärhebel. These parts are usually heavily loaded and subjected to high abrasion. They are also accelerated comparatively high with each stapling operation. Already the production of such a ceramic part can increase the service life and simplify the maintenance.

According to a development of the invention, the part made of ceramic is a ceramic injection molding. Such parts can be produced comparatively inexpensively and with high dimensional accuracy even in high serial numbers.

Further advantageous features will become apparent from the dependent claims, the following description and the drawings.

Fig. 1

Eine Ansicht einer teilweise geschnittenen erfindungsgemässen Heftvorrichtung,

Fig. 2

Eine weitere Ansicht der Heftvorrichtung,

Fig. 3

Eine räumliche Ansicht der erfindungsgemässen Heftvorrichtung,

Fig. 4

Eine räumliche Ansicht eines Teils der erfindungsgemässen Heftvorrichtung,

Fig. 5a und 5b

Räumliche Ansichten eines Umbiegeflügels, und

Fig. 6

Eine räumliche Ansicht eines Treibers.

An embodiment of the inventive stapling device will be explained in more detail with reference to the drawing. Show it:

Fig. 1

A view of a partially cut inventive stapling device,

Fig. 2

Another view of the stapler,

Fig. 3

A spatial view of the inventive stapling device,

Fig. 4

A spatial view of a part of the inventive stapling device,

Fig. 5a and 5b

Spatial views of a folding wing, and

Fig. 6

A spatial view of a driver.

The stapling device 1 has a housing 4, on which at least one stapling head 2 is mounted. This stapling head 2 is located, for example, in a saddle stitcher over a gathering chain, not shown here. Below this gathering chain is a bender 3. Between the stapling head 2 and the bender 3 are not shown here to be stapled printed products, such as signatures promoted.

In stapling head 2, the staples, not shown here, are preformed by a wire 5. The wire 5 is withdrawn from a roll, not shown here and supplied with a bent tube 11 of a wire nozzle 12.

For the transport of the wire 5, two feed rollers 6 and 7 are mounted on the frame 4, which are rotatably driven about a shaft 9 and 10 respectively. With a lever 8, the feed roller 6 can also be rotated by hand. About the wire nozzle 12, a wire knife 13 is arranged on a Abschärhebel 14.

With this 5 pieces of wire are cut from the wire, with each of which a clamp is formed in a conventional manner. For this purpose, a driver 16 and two benders 17 are vertically moved in a conventional manner with a driver plunger 15. With the benders 17, the two free ends of the cut piece of wire are bent by 90 ° down.

With the driver 16, these preformed brackets are driven into the product back. With the bender 3, these are finally bent over at 90 ° after projecting ends, so that these ends run parallel to the product back. The clip is closed. For this purpose, the bender 3 on two pivotally mounted on a holder 18 Umbiegeflügel 20. These are according to FIG. 4 arranged mirror-symmetrically to each other and each limited to pivot about an axis 21. The pivoting movement takes place with a push rod 19, which is guided vertically displaceable and engages with a driver 22 between these two Umbiegeflügel 20. If the push rod 19 is moved downward, the two Umbiegeflügel 20 are pivoted on the arms 23. The driver 22 engages in this case in the FIG. 5b shown inner surface 25 of the arm 23 at.

The Umbiegeflügel 20 each have a V-shaped groove 26, which in the position according to FIG. 4 run parallel to the transport direction of the printed products. These grooves 26 serve in a known manner for guiding the free ends of the preformed wire clip to be bent over. For this purpose, the Umbiegeflügel 20 with the push rod 19 in the in FIG. 4 shown pivoted position. For storage, these Umbiegeflügel 20 each have an opening 24. During stapling, the printed product to be stapled with a vertically movable holder 27 can be stabilized become.

The driver 16 is in accordance with FIG. 6 plate-shaped and has for its attachment to the driver plunger 15 has two openings 28 and 29. To guide the vertical movement of the driver 16 has two laterally projecting guide members 30. At the bottom there is an edge 31 against which the preformed staple to be driven is loaded. As can be seen, in particular the Umbiegeflügel 20 and the driver 16 are highly stressed parts, which must also be accelerated during the stapling process. Also heavily stressed and sometimes accelerated are the bender 17, the push rod 19, the wire nozzle 12, the wire knife 13 and the Drahtabschärhebel 14. At least one of these parts is at least partially made of engineering ceramics. The ceramic is preferably an oxide ceramic, in particular a mixed oxide ceramic. Oxide ceramics are usually more than 90% of single-phase and one-component metal oxides. The metal oxides are, for example, alumina, magnesia or zirconia. An example of a suitable mixed oxide ceramic is aluminum titanate. However, other oxide ceramics or mixed oxide ceramics are also known.

The production of the ceramic part is preferably carried out by ceramic injection molding, also called ceramic injection molding (CIM). In this injection molding a very fine ceramic powder is mixed with a thermoplastic binder, which can be injected similar to plastic. After demolding, the intermediate product is pyrolyzed and sintered. Sintering is a manufacturing process that usually takes place in three stages. Possible is a finishing for example by polishing with diamond tools. A significant advantage of such a part is the high and longer dimensional stability with respect to a part made of tool steel and the constant material quality. Compared to tungsten carbide is the significant advantage that the part is much less brittle and thus can hardly be destroyed during installation. Unlike carbide, the surface can not break. Further advantages are compared with steel lower density, for example 5 kg / dm ³ , the good emergency running properties and the high and constant surface quality. Also advantageous are the temperature resistance and the small thermal expansion.

Other suitable fields of use for parts of said ceramic are generally such highly stressed parts in other non-inventive devices and machines for postpress. These include, in particular, sheet feeders, merchandise stickers, supplements. The parts here are, for example, grippers, clamping devices, gripper pads, nozzles, creasing wheels and perforating wheels as well as pawls, detents and parts in suction cups.

Claims (8)

1. Stapling device (1) for stapling printed products, with a stapling head (2), which has a driver (16) and bender (17), which preform a wire staple and drive it through the back of a product, and with a curler (3), which has curling arms (20), which curl the open ends of the wire staple, characterised in that at least a part of the stapling device (1) is made at least partly from ceramic.
2. Stapling device according to claim 1, characterised in that the driver (16), the bender (17), the curler (3) or parts of the curler (3) are made at least partly from ceramic.
3. Stapling device according to claim 1 or 2, characterised in that the part is a sintered moulding.
4. Stapling device according to one of claims 1 to 3, characterised in that the part is made from an oxide ceramic.
5. Stapling device according to one of claims 1 to 4, characterised in that the part is made from a mixed oxide ceramic.
6. Stapling device according to one of claims 1 to 5, characterised in that the part is made from at least two parts firmly connected to each other, in which the first part is made from ceramic and the other part from another material, particularly steel or carbide.
7. Stapling device according to claim 6, characterised in that the part is a wear part, particularly a driver (16), a curling arm (20), a bender (17), a centering foot, a push rod (19), a wire nozzle (12), a wire guide (11), a wire knife (13), a wire scraping lever (14) or gear cutter.
8. Stapling device according to one of claims 1, 2 and 4 to 7, characterised in that the part is an injection moulding part.

Images