DE202023105531U1 - Circular knife arrangement - Google Patents

Abstract

Circular knife arrangement, comprising a cylindrical knife holder, along the axial direction of which a shaft hole passing through is provided, a circular cutting knife being pushed onto the outer wall of the knife holder, characterized in that an annular locking groove is provided along the circumferential direction of the knife holder, in which a clamping ring is provided is; wherein an annular projection is provided along the circumferential direction of the knife holder; wherein the circular cutting blade is disposed between the clamping ring and the projection; wherein the projection comprises an upper side inclined towards the circular cutting knife, an elastic O-ring being pushed onto the knife holder and located on the upper side.

Description

TECHNICAL FIELD

The present utility model relates to the field of paper production, in particular to a circular knife arrangement.

STATE OF THE ART

A cutting machine is a mechanical device for cutting a sheet of paper, mica tape or film with a large width into several narrow strips. In an existing circular knife arrangement of a cutting machine, a circular blade is rotatably pushed onto a knife holder. A clamping ring is used on one side and a plate steel spring on the other side to clamp the blade together. The elastic force of the steel spring presses the blade against the knife holder so that it does not rotate relative to the knife holder. If the diameter of the steel spring is too large, its effect in fixing the blade will be reduced, causing the blade to rotate easily and thus causing poor cutting accuracy; If the diameter of the steel spring is too small, it is difficult to press the steel spring onto the knife holder and the steel spring will also break when pressed. When the blade is fixed by the steel spring, the blade and the steel spring rotate easily relative to each other due to the high rotation speed of the blade, thereby causing wear on the blade and the steel spring and further impairing the cutting accuracy. To solve this problem, see the previous patent specification 202210789819.5 The applicant uses an embodiment in which a blade is fixed via a locking ring and an elastic washer. The blade is pressed through the elastic disc and the blade is fixed by the friction between the elastic disc and the blade. Due to the elasticity of the elastic disc, the blade is not subject to wear when rotating at high speed, thereby saving costs. The locking ring is snapped onto a knife holder shaft so that the elastic disc, the blade and a knife base are always in contact with one another, which fixes the blade and prevents the blade from pivoting when rotating. Furthermore, a high degree of rotational accuracy of the blade is achieved and a deviation from the target speed is largely prevented. In practical use, loading the blade causes axial movement, thereby depressing the elastic disk and thus significantly shortening the life of the elastic disk.

CONTENT OF THIS USER MODEL

The present utility model is based on the task of providing a circular knife arrangement in order to solve or partially solve the above problem.

• Eine Kreismesseranordnung umfasst einen zylindrischen Messerhalter, entlang dessen axialer Richtung ein dadurch hindurchgehendes Wellenloch vorgesehen ist, wobei auf der Außenwand des Messerhalters ein kreisförmiges Schneidemesser aufgeschoben ist, wobei entlang der Umfangsrichtung des Messerhalters eine ringförmige Rastnut vorgesehen ist, in der ein Klemmring vorgesehen ist; wobei entlang der Umfangsrichtung des Messerhalters ein ringförmiger Vorsprung vorgesehen ist; wobei das kreisförmige Schneidemesser zwischen dem Klemmring und dem Vorsprung angeordnet ist; wobei der Vorsprung eine gegen das kreisförmige Schneidemesser hin geneigte Oberseite umfasst, wobei auf dem Messerhalter ein elastischer O-Ring aufgeschoben ist, der sich auf der Oberseite befindet.

According to the present utility model, the task is solved by the following configuration:

• A circular knife arrangement comprises a cylindrical knife holder, along the axial direction of which a shaft hole passing through is provided, a circular cutting knife being pushed onto the outer wall of the knife holder, an annular locking groove being provided along the circumferential direction of the knife holder, in which a clamping ring is provided; wherein an annular projection is provided along the circumferential direction of the knife holder; wherein the circular cutting blade is disposed between the clamping ring and the projection; wherein the projection comprises an upper side inclined towards the circular cutting knife, an elastic O-ring being pushed onto the knife holder and located on the upper side.

It is preferably provided that the thickness of the circular cutting blade gradually decreases along its radial direction from the inside to the outside.

Preferably it is provided that the projection comprises an inside surface and an outside surface, the top being connected to the inside surface and the outside surface; and wherein the inner side surface faces the circular cutting blade and conforms to the shape of the circular cutting blade.

It is preferably provided that there is a curved connecting surface between the top side on the one hand and the inside surface or the outside surface on the other hand.

It is preferably provided that the top and the axis of the knife holder enclose an angle of 20° to 40°.

It is preferably provided that the projection and the knife holder are formed in one piece.

It is preferably provided that the O-ring has a circular cross section.

It is preferably provided that the O-ring is made of silicone or rubber.

It is preferably provided that the clamping ring is made of elastic metal.

It is preferably provided that the knife holder is provided on its inside along the circumferential direction with a recess extending radially therethrough, thereby forming a pressure bar, with a threaded hole being provided at a position corresponding to the pressure bar along the radial direction of the knife holder, in which over Thread fit a fastening threaded rod is provided, the front end of which rests on the pressure bar.

Advantageous effects of the utility model: The O-ring is press-fitted onto the part between the projection and the circular cutting knife, which presses the circular cutting knife to fix the circular cutting knife in cooperation with the clamping ring. With the aid of high friction between the O-ring on the one hand and the circular cutting blade and the projection on the other hand, relative rotation of the circular cutting blade is prevented; The O-ring is located on the top and thus rests against the circular cutting blade under the action of pressure from its inclined surface; When the circular cutting blade moves axially, the O-ring is moved outwards under the influence of a force, which results in deflection and thus avoids damage. The projection has an inclined surface which is matched to the shape of the circular cutting knife, whereby surface contact with the circular cutting knife can be achieved. This reduces wear and extends the service life.

BRIEF DESCRIPTION OF THE DRAWINGS

• 1 a front view of a knife holder;
• 2 a sectional view by EE according to 1 ;
• 3 a sectional view through DD according to 1 ;
• 4 an enlargement of the section A according to 3 ;
• 5 a schematic position representation according to 4 after adding a circular cutting blade and an O-ring.

DETAILED DESCRIPTION

The technical design of the present utility model will be discussed in more detail below based on the specific embodiments.

In the description of the present utility model, the terms "inside", "outside", "top", "bottom", "horizontal", etc. are used in relation to the directional or positional relationship shown in the respective drawing, in order to simply describe the utility model describe and, if necessary, simplify the description. In other words, these terms neither implicitly nor explicitly indicate the positioning as well as the design and operation of the device or element in question in a predetermined positioning, so that there is no restriction on the utility model here either.

As in 1 until 5 shown, a circular knife arrangement according to the present utility model comprises a cylindrical knife holder 10, along the axial direction of which a shaft hole 12 passing through is provided. A circular cutting knife 14 is pushed onto the outer wall of the knife holder 10. An annular locking groove 16 is provided along the circumferential direction of the knife holder 10, in which a clamping ring (not shown) is provided; An annular projection 18 is provided along the circumferential direction of the knife holder 10; The circular cutting blade 14 is arranged between the clamping ring and the projection 18; The projection 18 includes an upper side 181 that is inclined towards the circular cutting knife 14. An elastic O-ring 20, which is located on the upper side 181, is pushed onto the knife holder 10.

For some structures of the utility model, for example the clamping ring, or the three-dimensional structure, reference can be made to the previous patent specification 202210789819.5 of the applicant.

The thickness of the circular cutting blade 14 gradually decreases from the inside to the outside along its radial direction.

The projection 18 includes an inside surface 182 and an outside surface 183. The top 181 is connected to the inside surface 182 and the outside surface 183; The inner side surface 182 faces the circular cutting blade 14 and is matched to the shape of the circular cutting blade 14. Between the top 181 on the one hand and the inside surface 182 or the outer side surface 183, on the other hand, each has a curved connecting surface 184, which can effectively reduce damage to the O-ring 20.

The top 181 and the axis of the knife holder 10 form an angle of 20° to 40°, preferably 28°.

The projection 18 and the knife holder 10 are formed in one piece. The O-ring 20 has a circular cross section. The O-ring 20 is made of silicone or rubber. The clamping ring is made of elastic metal to firmly press the circular cutting blade 14 by means of an elastic force.

The knife holder 10 is provided on its inside along the circumferential direction with a recess 22 extending radially therethrough, thereby forming a pressure bar 24. At a position corresponding to the pressure bar 24, a threaded hole 26 is provided along the radial direction of the knife holder 10, in which a fastening threaded rod is provided via a thread fit, the front end of which rests on the pressure bar 24.

With regard to the functional principle, the knife holder 10 is arranged on a knife shaft (not shown) and is fixed by pressing the pressure bar 24 via the fastening threaded rod.

The circular cutting knife 14 is pushed onto the knife holder 10 and fixed at one end via the open clamping ring, while the other end is fixed via the O-ring 20.

So far, only one exemplary embodiment of the present utility model has been explained without restricting the scope of the utility model. Any equivalent structural or process modifications made on the basis of the description and accompanying drawing of the utility model or used directly or indirectly in other affected areas shall also be included within the scope of protection of the utility model.

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 202210789819 [0002, 0018]

Claims (10)

Circular knife arrangement, comprising a cylindrical knife holder, along the axial direction of which a shaft hole passing through is provided, a circular cutting knife being pushed onto the outer wall of the knife holder, characterized in that an annular locking groove is provided along the circumferential direction of the knife holder, in which a clamping ring is provided is; wherein an annular projection is provided along the circumferential direction of the knife holder; wherein the circular cutting blade is disposed between the clamping ring and the projection; wherein the projection comprises an upper side inclined towards the circular cutting knife, an elastic O-ring being pushed onto the knife holder and located on the upper side. Circular knife arrangement according to Claim 1 , characterized in that the thickness of the circular cutting blade gradually decreases from the inside to the outside along its radial direction. Circular knife arrangement according to Claim 2 , characterized in that the projection includes an inside surface and an outside surface, the top being connected to the inside surface and the outside surface; and wherein the inner side surface faces the circular cutting blade and conforms to the shape of the circular cutting blade. Circular knife arrangement according to Claim 3 , characterized in that there is a curved connecting surface between the top on the one hand and the inside surface or the outside surface on the other hand. Circular knife arrangement according to Claim 1 , characterized in that the top and the axis of the knife holder enclose an angle of 20° to 40°. Circular knife arrangement according to Claim 1 , characterized in that the projection and the knife holder are formed in one piece. Circular knife arrangement according to Claim 1 , characterized in that the O-ring has a circular cross section. Circular knife arrangement according to Claim 1 , characterized in that the O-ring is made of silicone or rubber. Circular knife arrangement according to Claim 1 , characterized in that the clamping ring is made of elastic metal. Circular knife arrangement according to Claim 1 , characterized in that the knife holder is provided on its inside along the circumferential direction with a recess extending radially through it, thereby forming a pressure bar, with a threaded hole being provided at a position corresponding to the pressure bar along the radial direction of the knife holder, in which over Thread fit a fastening threaded rod is provided, the front end of which rests on the pressure bar.

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