EP0704322B1 - Binder cover - Google Patents

Description

The invention relates to a binding spine for holding together a stack of sheets according to the preamble of Claim 1.

A spine according to the preamble of the claim is out US-A-2 747 577.

These sheets can be paper pages, Trade plastic films or cardboard pages.

The binding spines of the prior art show themselves in Binding spine longitudinal back portion and Fingers on which on one side of the back part with Are spaced from each other and perpendicular to Stretch the length of the truss away from the back and together with the back part form loops, which by Holes of the sheets to be bound can be passed through. Here the back and fingers are together one-piece elastic body made of plastic. The Finger ends extend at least as close to Back part that the leaves are not accidentally on them can slip out.

beim Schneiden des Folienhalbzeugs in Streifen,

beim Ausstanzen der einzelnen Binderücken,

beim Zuschneiden der Binderücken auf die gewünschte Länge.

These bindings are usually punched out of polyvinyl chloride film (PVC film) and then heated and rolled into a cylindrical shape. This results in a total of about 15% cutting waste based on the total amount of semi-finished film used as the starting material:

when cutting the semi-finished film into strips,

when punching out the individual ridges,

when cutting the trimmings to the desired length.

PVC is the most suitable for the punching and rolling process Material, but brings with the waste incineration Environmental problems in the form of toxic gases.

The round profile created by the rolling caused before especially with larger diameters a curved and optical disadvantageous outer profile of the stack of sheets.

The object of the invention is to solve a problem Process for the production of an elastic bandage to provide, in which each sprayable and in cured state uses elastic plastic can be and with which the binding comb inexpensive manufactured and disposed of in an environmentally friendly manner. To the ridges should be designed so that after the Method according to the invention can be produced and that Profile of the spine and the bound stack of sheets can be designed to be variable and visually appealing. In addition, the binding spine should be designed so that a protection against accidental slipping out of the Leaves is present.

This object is achieved according to the invention by the characterizing features of claim 1 and claim 12 solved.

a) Durch die Herstellung des Binderückens im Spritzgußverfahren wird eine Materialersparnis von etwa 15 % gegenüber dem Stanzverfahren des Stands der Technik erzielt. Das Material von Ausschußteilen oder anderer nichtverwendbarer Teile kann dem Spritzgußprozeß wieder zugeführt werden.

b) Da als Ausgangsmaterial Kunststoffgranulat statt Kunststoffolie verwendet wird, entfällt ein Fertigungsschritt, nämlich die Herstellung von Kunststoffolienhalbzeug.

c) Als Rohmaterial ist jeder spritzbare und im ausgehärteten Zustand elastische Kunststoff geeignet, nicht nur PVC. Dies ist umweltfreundlicher und flexibler.

d) Der spritzgegossene Binderücken kann in jedem geeigneten, zum Beispiel rechteckigen, elliptischen oder dreieckigen, Profil ausgebildet werden. Hierdurch können optisch ansprechende Formen und Profile des Binderückens und wie auch des gebundenen Papierstapels erzeugt werden. Bei spritzgegossenen Binderücken wird eine Profilwahl möglich, mit der zusätzlich zu den unter a) genannten Einsparungen nochmals 10 % Material eingespart werden können.

The following advantages are achieved by the invention:

a) The manufacture of the binding spine in the injection molding process results in a material saving of approximately 15% compared to the punching process of the prior art. The material from reject parts or other unusable parts can be returned to the injection molding process.

b) Since plastic granulate instead of plastic film is used as the starting material, there is no manufacturing step, namely the production of plastic film semi-finished products.

c) Any sprayable and in the hardened state elastic plastic is suitable as raw material, not only PVC. This is more environmentally friendly and flexible.

d) The injection molded binding spine can be formed in any suitable, for example rectangular, elliptical or triangular, profile. As a result, visually appealing shapes and profiles of the binding spine and the bound paper stack can be produced. In the case of injection-molded binding spines, it is possible to choose a profile with which, in addition to the savings mentioned under a), another 10% material can be saved.

Fig.1

eine perspektivische Darstellung einer bevorzugten Ausführungsform eines Binderückens gemäß der Erfindung;

Fig.2

einen Querschnitt einer weiteren Ausführungsform eines Binderückens gemäß der Erfindung, welcher einen Stapel von Blättern zusammenhält;

Fig.3

einen Querschnitt der bevorzugten Ausführungsform des Binderückens von Fig.1 mit einer aufgesteckten Leiste.

Fig.4

einen Querschnitt der Ausführungsform von Fig.2, wobei der gebundene Blätterstapel aufgeschlagen ist;

Fig.5

einen Querschnitt einer weiteren Ausführungsform eines Binderückens gemäß der Erfindung;

Fig.6

eine perspektivische Darstellung einer weiteren Ausführungsform eines Binderückens gemäß der Erfindung.

The invention is described in more detail below using several exemplary embodiments with reference to the drawings. You show in

Fig. 1

a perspective view of a preferred embodiment of a truss according to the invention;

Fig. 2

a cross section of a further embodiment of a spine according to the invention, which holds a stack of sheets together;

Fig. 3

a cross section of the preferred embodiment of the binding spine of Figure 1 with an attached bar.

Fig. 4

a cross section of the embodiment of Figure 2, wherein the bound stack of sheets is opened;

Fig. 5

a cross section of a further embodiment of a truss according to the invention;

Fig. 6

a perspective view of another embodiment of a truss according to the invention.

The spine 1 has a length in the spine extending back part 6 and fingers 8, which on one Side of the back part 6 spaced apart are and transversely to a longitudinal axis 4 of the spine 1st Stretch away from the back part 6, as shown in Fig.1. The Longitudinal axis 4 of the spine 1 extends in Longitudinal ridges. The fingers 8 are curved, whereby each of the fingers 8 together with the back part 6 one Loop 10 forms. The finger ends 14 are the other Side of the back part 6, seen in a direction transverse to Longitudinal axis 4, non-overlapping opposite.

In the preferred embodiment shown in Fig.1 the back part 6 has projections on its other side 16 on which spaces are formed by a distance are arranged from each other and are transverse to the longitudinal axis 4 stretch away from the back section 6.

The loop-shaped fingers 8 are relative to the Projections 16 arranged so offset that the Finger ends 14 of the loop-shaped fingers 8 in the Extend spaces between the projections 16.

The back part 6 and the fingers 8 together are one one-piece, injection molded body. By producing the binding spine 1 in Injection molding is compared to a material saving the stamping process of the prior art. The Material from rejects or other unusable items Parts can be returned to the injection molding process.

Because plastic granules instead of raw material Plastic film is used, is omitted Manufacturing step, namely the production of Semi-finished plastic film.

However, any injectable or is as raw material thermally deformable and in the hardened state Suitable elastic material, preferably polyethylene used. This is regarding disposal more environmentally friendly than polyvinyl chloride (PVC) because Burning polyethylene less toxic fumes arise. However, for cost reasons, too Polyvenyl chloride (PVC) can be used.

Another advantage of the injection molding process brings, is that the injection molded binding spine 1 in each suitable e.g. rectangular, elliptical, round or triangular profile can be formed. According to the preferred embodiments shown is the Sheet stack 17 facing side of the binding spine 1 flattened so that the leaves are flush with each other.

The binding spine 1 is designed so that it in Injection molding process made simple and inexpensive can be. Therefore the fingers 8 are shaped in such a way that the finger ends 14 of the other side of the back part 6 not overlapping because in the case of one Overlap the injection mold too complicated and expensive would fail. Basically there is an overlap possible. The injection mold then has an undercut on.

Each of the fingers 8 has two straight parallel side edges, which are in planes perpendicular to the longitudinal axis 4 of the Back 1 are located. Each of the protrusions 16 has also two straight parallel margins, which in Layers lie which are perpendicular to the longitudinal axis 4 of the Are 1, such that the side edges a finger 8 along the in them Longitudinal ridges opposite side edges of protrusions 16 extending finger 8 in Surround spine longitudinal direction. In other words the projections 16 parallel to the fingers 8. The edges of the Finger ends 14 are substantially straight and touch the other side of the back part is not. Preferably they have Finger 8, the projections 16 and the back part 6 edges or edge surfaces which are essentially either in Planes are perpendicular to the longitudinal axis 4 or parallel to Longitudinal axis 4 are. Preferably the fingers have 8 and Projections 16 in the longitudinal direction of the spine the same Width.

In the embodiment of Figure 1, the stretch Projections 16 from the other side of the back part 6 in a predetermined length away, which is at least three times as much is as large as the thickness of the fingers 8, preferably at least 1/2 centimeter. This results in an increased Flexural rigidity of the truss as the straight ones Side edges of the interlocking fingers 8 and Support projections 16 against each other when the binding spine by its own weight or by the weight of one by sheet stack bound is bent. A there is no such support if the Projections are too short. Secondly, through long Protrusions against the safety of the back 1 Opening the lock increases by the in Longitudinal interlocking fingers and Projections is formed.

The binding spine 1 serves to hold together and bind one Stack 17 of sheets 18, as shown in Fig. 2. These sheets can be paper pages, Trade plastic films or cardboard pages. in the In this case, 1 page of paper is made with the binding spine 18 bound.

The spine 1 shown in Figure 2 is another Embodiment of the invention, being in this Embodiment a substantially rectangular profile Has. This makes it visually appealing rectangular profile of the paper stack 2 allows.

When tying the loop-shaped fingers 8 through a special device (not shown) or if the Number of loop-shaped fingers 8 is small, manually bent up until the originally loop-shaped fingers 8 are partially or completely straight and pass through holes 19 in the paper pages 18 can be pushed.

Since the plastic from which the binding spine 1 is made is elastic, the straight-curved fingers 8 spring Let go back to their looped starting position and hold the stack 17 of paper pages 18 together. The Finger ends 14 extend at least as close to this to the back part 6 that the paper pages 18 are not on them can accidentally slip out. Bound is a narrow u-shaped or at the longitudinal ends of the comb l-shaped slot 20 between the Side edges of a finger 8 and the side edges of the this finger 8 surrounding projections 16 and between the Finger ends 14 and the other side of the back part 6 available, which on the side pointing away from the stack 17 of the ridge 1 is. Since this slot 20 because of Presence of the protrusions 16 along the Longitudinal ridge is tooth-shaped ensured that when opening the stack 17 none Paper pages 18 from the loop-shaped fingers 8 slip and through the slot 20 from the stack 17 solve. When opening the stack 17 are Paper pages 18 along the loop-shaped fingers 8 moveable, being in the open state on the one hand the free end edges of the projections 16, which are parallel to the ridge length direction, and on the other hand the Edge of one side of the back part 6 one each Form stop for the paper sides 18.

The slot 20 must be wide enough to accommodate the slot 20 filling parts of the injection mold the high surface pressure that arises during injection molding to be damaged. On the other hand, the slot 20 must be narrow be enough for leaves to slide out of the Back 1 is prevented.

To save material and to increase the elasticity of the fingers increase, form in the preferred embodiment of Fig.1 the fingers 8 most of the circumference of the Loops 10.

The binding spine 1 has a bar 21, which is in Longitudinal direction of the binding spine 1 and which on the finger ends 14 of the loop-shaped fingers 8 and the back part 6 of the spine 1 is attached, like Fig.3 shows. For this purpose, the binding spine has 1 holes 22, in which attached to the bar 21 or in one piece with it executed pins 24 are inserted. The bar 21 can also in other ways, for example by a Adhesive connection, a high-frequency welding or a other connection method, on the back part 6 or on the Fingers 8 are attached.

This bar 21 is optically advantageous on the one hand because the slot 20 between the loop-shaped fingers 8 and covered the back part 6. On the other hand, it prevents the fingers 8 and the back part 6 diverge.

The bar 21 can be punched or cut or in Injection molding process. You can on the back 6 and on the loop-shaped fingers 8 or only be attached to one of these parts.

For color coding or bound stack 17 on the to be able to distinguish from one another at first glance the strips 21 for different combs 1 in different colors can be made.

In the embodiment of FIG. 3, the binding spine 1 two cover pages attached to it, which of the Stick bar 21 across. This covers a cover page 26 an upper side of the stack 17 and another Cover page 28 is a lower side of stack 17. The one cover page 26 is preferably made of one transparent film, while the other cover 28 is made of cardboard. The two cover pages 26, 28 can also be made together in one piece, whereby they are then extend around the back of the stack and on the bar 21 are attached. In further embodiments, the two cover pages 26, 28 and the strip 21 together as be made in one piece or the cover pages 26, 28 are directly on the back part 6 and / or on the fingers 8 attached.

If a part 30 formed by the fingers 8 of the Loops 10 is flat, as in the one shown in Fig.2 Embodiment, then an absolute flatness is at Copying on a copier 32 possible, see Fig. 4. The Paper pages 18 then lie flat on a support plate 34 of the copying machine 32.

5 shows a further embodiment of a Bandage 1 shown according to the invention, in which the finger ends 14 and the other side of the back part 6 with a radial distance dr transversely to the truss body level face each other overlapping.

6 shows a further embodiment of a Bandage 1 shown according to the invention, in which the Fingers 8 are provided with reinforcing ribs 25 to the Increase the resistance of the back 1 against opening. In addition, the back part 6 has a reinforcing rib 25 provided to the bending stiffness of the back 1 in Increase longitudinal direction. The reinforcing ribs 25 can be formed by bead-shaped hollow ribs, which Form "waves" or through local thickening of material of the bridle 1. The latter preferably applies. A such thickening of material is not in the prior art possible, which uses foils that are punched and Rolling processes are shaped.

If the spine has 1 ribs 25, then it has Injection mold groove-shaped recesses through which the flow tendency of the injection molding material is increased. By the improved flow properties of the injection molding material fewer injection points are necessary, which in turn is Injection mold cheaper.

Preferably, the ribs 25 are on the inside of the Bandage 1 formed. Towards a solution, at which the ribs 25 on the outside of the spine 1 are arranged has an arrangement of the ribs 25 on the Inside the advantage that the outer surface of the The spine is smooth and flat, which makes the spine 1 by handling devices, e.g. pneumatic suction pads, can be better absorbed. Then they are groove-shaped recesses on the outer surface of the Core of the injection mold and not on the inner Arranged peripheral surface of the outer shell, whereby the Injection mold becomes cheaper because of external machining are generally cheaper than internal machining.

Claims (15)

1. An elongated binder (1) for securing a stack (17) of sheets (18) comprising a dorsal part (6) with a longitudinally extending central axis, a plurality of fingers (8) mutually spaced at a lateral side of the dorsal part (6), extending transversally from the longitudinally extending central axis of the dorsal part (6) and forming loops (10) which are insertable through holes (19) in the sheets (18) to be bound, whereby the dorsal part (6) and the fingers (8) are formed integrally in resilient plastic and the free ends (14) of the fingers extend at least close to the dorsal part (6) to secure the sheets (18) on the binder, characterized in that the dorsal part (6) and the fingers (8) are formed of an injection moldable plastic material body and in that the free ends (14) of the fingers are positioned opposite to the other lateral side of the dorsal part (6) in a non-overlapping relationship or in a overlapping relationship whereby exists a radial distance transversal to the central axis.
2. Binder according to claim 1, characterized in that the dorsal part comprises teeth (16) on the other lateral side of the dorsal part (6) which are spaced from the fingers and, forming gaps therebetween and which are oriented transversally from the longitudinally extending central axis of the dorsal part (6), and in that the fingers (8) are positioned between adjacent teeth (16) in the longitudinal direction of the dorsal part (6), whereby the ends (14) of the fingers (8) enter the hollow space between the teeth (16).
3. Binder according to one of the preceding claims, characterized in that the binder comprises a securing means (21, 22) which connects the dorsal part (6) with at least one finger (8) to avoid the separation of the fingers (8) and the dorsal part (6).
4. Binder according to claim 3, characterized in that the securing means (21) comprises a spine (21) which is connected with the dorsal part (6) and with the fingers (8).
5. Binder according to one of the preceding claims, characterized in that the binder comprises at least one cover sheet (26, 28) to cover the stack (17) of sheets.
6. Binder according to claim 4 and 5, characterized in that the cover sheet (26, 28) is connected with the spine (21) or in that the cover sheet (26, 28) is integrally formed with the spine (21).
7. Binder according to one of the preceding claims, characterized in that at least the dorsal part (6) and the fingers (8) are made of polyethylene.
8. Binder according to one of the preceding claims, characterized in that the dorsal part (6) and the fingers (8), in the sectional view transversal to the longitudinal axis of the binder, form loops which do not have a circular form, which are completely closed or which only are provided with a small slot (20) between the free ends (14) of the finger and the dorsal part (6).
9. Binder according to one of the preceding claims, characterized in that the lateral side which is oriented towards the stack (17) of sheets is flattened such that the sheets (18) in the binder form a stack (17) with square edges.
10. Binder according to one of the preceding claims, characterized in that the fingers (8) are provided with at least one reinforcement rib (25).
11. Binder according to one of the preceding claims, characterized in that the dorsal part (6) is provided with at least one reinforcement rib (25).
12. Method for producing a binder (1) for holding a stack (17) of sheets (18), comprising a dorsal part (6) with a longitudinally extending central axis, a plurality of fingers (8) mutually spaced at a lateral side of the dorsal part (6), extending transversally from the longitudinally extending central axis of the dorsal part (6) and forming loops (10) which are insertable through holes (19) in the sheets (18) to be bound, whereby the dorsal part (6) and the finger (8) are formed integrally in resilient plastic and the free ends (14) of the fingers extend at least close to the dorsal part (6) to secure the sheets (18) on the binder, characterized in that the dorsal part (6) and the fingers (8) are formed as an integrally formed body in an injection process and in that the free ends (14) of the fingers are positioned opposite to the other lateral side of the dorsal part (6) in a non-overlapping relationship or in a overlapping relationship whereby exists a radial distance transversal to the central axis.
13. Method according to claim 12, characterized in that the other lateral side of the dorsal part (6) is formed with teeth (16) in the molding process, which are interlocking with the fingers (8) in the longitudinal direction of the binder.
14. Method according to claim 12 or claim 13, characterized in that in the molding process the fingers (8) are formed with at least one reinforcement rib (25).
15. Method according to one of claims 12 to 14, characterized in that in the molding process the dorsal part (6) is formed with at least one reinforcement rib (25).

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