Cutting device for baking paper

Abstract

The cutting device (3) for non-tear-resistant sheet materials (13) such as baking paper comprises a guide profile (5) and a knife (7) slidably mounted on this guide profile (5). The knife (7) includes an operating element (15) and a guide body (19) connected to the operating element (15) via a neck (17). A blade (21) with at least one cutting edge (23) is anchored to the neck (17) and to the operating element (15). Support elements (25) project from the underside of the operating element (15), which press the sheet material (13) locally against shoulders (33) of the guide profile (5) next to the blade (21) during cutting. This improves the cutting quality.

Description

[0001] The invention relates to a cutting device for baking paper according to the preamble of claim 1.

[0002] It is common practice to store plastic, aluminum, or paper films, such as baking paper, rolled onto a core in a dispenser housing. The core is typically a cardboard or plastic sleeve. Dispenser housings can be simple cardboard boxes or more robust containers made of materials like plastic or metal, which can be refilled with replacement rolls when the film supply is depleted. Dispenser housings have a dispensing opening through which an end section of the rolled-up film can be pulled out of the container and separated from the remaining film using a cutting device.

[0003] Tear-off devices, especially in simple cardboard dispenser housings, can include a cost-effective serrated tear-off edge. To tear off an end section of the film strip pulled from the dispenser housing, the film is pulled against the cutting teeth. The cutting teeth penetrate the film strip, and the end section can be torn off along the perforation line. Often, however, the sheet is not separated cleanly along a straight line as desired. Baking paper and aluminum foil, in particular, can easily tear in unwanted places due to the forces exerted during tearing. Plastic cling film can be distorted or stretched unevenly during tearing. Furthermore, sections of cut plastic film can stick together undesirably due to van der Waals forces.Instead of serrated tear-off edges, separating devices can include a cutting device with a guided, movable blade.

[0004] From CH699230A2, a film dispenser is known that comprises a housing with a dispensing opening through which an end section of film can be pulled out of the housing. The film is stored rolled up on a core sleeve within the housing. A cutting device is attached to the upper edge of a front wall of the housing. The cutting device comprises a guide profile and a blade mounted on the guide profile and movable along its longitudinal direction. The guide profile comprises two opposing wall sections that laterally define a guide channel with a longitudinal gap located at the top. Adjacent to the longitudinal gap, the guide profile includes laterally projecting edge areas or shoulders.The knife comprises a guide body which is slidably mounted in the guide channel and an operating element arranged above the guide channel, wherein the guide body and the operating element are connected to each other via a neck and a blade which protrude through the guide gap.

[0005] By sliding the blade along the guide profile, a film resting on the shoulders of the guide profile can be cut. The upper surfaces of the shoulders define the cutting plane. To improve the film's adhesion to the shoulders, they may include an adhesive layer. The flat underside of the operating element has good sliding properties relative to the film, i.e., a low coefficient of friction.

[0006] Properties such as the tear resistance of a sheet, as well as its static and kinetic friction relative to the guide profile and relative to the operating element, depend on the characteristics of the sheet, particularly its material composition. CH699230A2 does not provide more detailed information on the performance of the cutting device when cutting materials other than plastic films. When cutting non-tear-resistant sheets, such as baking paper or aluminum foil, the sheet may tear uncontrollably. Other undesirable effects include curved cutting lines if the sheet shifts slightly during cutting. Furthermore, starting the cut may be more difficult. For example, the blade may displace the sheet locally from the cutting plane if its cutting edge comes into contact with the sheet.This can lead to the edge area of ​​the surface structure between the control element and the guide body being compressed and unable to be cut at all.

[0007] One object of the present invention is therefore to create a cutting device that enables reliable separation of end sections even with baking paper or other non-tear-resistant sheet materials.

[0008] In contrast to the cutting device known from CH699230A2, the cutting device according to the invention comprises protruding structures on the underside or sole of the operating element. These structures are preferably rounded support bodies with which the operating element or the knife rests on the shoulders of the guide profile. The transmission of the contact or pressure force from the knife to the guide profile occurs essentially only in the area of ​​the support bodies. When a section of baking paper or, more generally, a sheet material to be cut rests on the shoulders of the guide profile, this sheet material is held clamped between the support bodies and the shoulders of the guide profile when the knife is moved. This ensures that the sheet material is fixed in close proximity to the blade during cutting and cannot slip significantly due to the force exerted by the cutting edge.In particular, this ensures that the surface structure is not undesirably displaced into the guide slot and damaged when a blade's cutting edge makes contact. The support bodies can comprise longitudinal ribs or sections of longitudinal ribs arranged parallel to the blade plane on both sides of the blade. Preferably, such rib sections are arranged only near the blade's cutting edge(s), so that they do not extend over the entire length of the sole. This allows the contact force of the support bodies to be increased in the area of ​​the cutting edge during cutting.

[0009] Additionally, a rib section can be arranged perpendicular to each cutting edge of the blade. This rib section ensures even pressure of the surface against both shoulders of the guide profile. Furthermore, it protects against injuries, as it is positioned in the respective cutting direction in front of the free portion of the blade's cutting edge that is not embedded in the operating element.

[0010] The overall height of this free area of ​​the cutting edge is preferably in the range of approximately 3 mm to 6 mm and is therefore comparatively large. This facilitates the initial cutting of various flat shapes and promotes the cutting of these shapes.

[0011] The height of the guide body is generally less than that of the free area of ​​the cutting edge. It can, for example, be on the order of 1 to 3 mm. This allows the overall height of the guide channel, and therefore the space required and the amount of material for the entire cutting device, to be kept comparatively low.

[0012] In one embodiment, the guide body and a central neck between the guide body and the control element have a T-shaped cross-section. The guide body comprises a substantially rectangular plate that is rigidly connected to the control element via the neck. The guide channel can also have a T-shaped cross-section, which is matched to that of the guide body and the neck of the knife. Alternatively, the wall of the guide channel can include inwardly projecting ribs or webs that form a section with a C-shaped cross-section within the guide channel for guiding the plate-shaped guide body. The guide plate is slidably mounted with only minimal play along these structures of the guide channel. This reliably prevents the knife from tilting or jamming during movement.

[0013] The cutting edge of the blade is inclined relative to the underside of the control element by a cutting angle which is preferably less than 45° and may be on the order of about 15° to about 35° and may in particular be about 28°.

[0014] The knife is typically designed to be essentially mirror-symmetrical with respect to two opposite cutting directions. It can comprise one blade with two mirror-symmetrically arranged cutting edges, or alternatively, two mirror-symmetrically arranged blades, each with one cutting edge. This allows the flat structure to be cut in the two opposite directions of movement of the knife.

[0015] In each cutting direction, the operating element includes an insertion area adjacent to the respective cutting edge, featuring an inclined stop surface. This ensures that, when the knife is moved, the edge of the surface to be cut is reliably guided to the cutting edge of the blade.

[0016] In a preferred embodiment, the operating element comprises a handle on its upper side with two concave bulges extending from a central crest. When moving the knife, the operator holds this handle between their thumb and forefinger. The handle shape ensures that, when the knife is moved in the respective cutting direction, a force is exerted on the operating element perpendicular to the cutting direction, in the direction of the guide profile's shoulders, along with a torque. This results in an additional clamping force on the support bodies located at the front in the direction of movement. The clamping force with which the surface structure is pressed against the guide rail's shoulders during cutting is greatest in the immediate vicinity of the respective cutting edge. Therefore, during cutting, the surface structure is particularly well fixed at the blade's cutting edge, i.e., precisely where the cutting edge exerts a force on the surface structure.

[0017] Preferably, the upper surfaces of the guide rail shoulders are designed to be non-slip. This can e.g. This is achieved through a strip of soft PVC. The static friction between the surface structure and the shoulders of the guide rail is particularly high during cutting due to the pressure exerted by the operating element and the high coefficient of friction of the adhesive strips.

[0018] To attach the guide profile to a dispenser housing, the guide profile can, for example, include two retaining elements spaced apart from each other transversely to the longitudinal direction. A first clamping profile can, for example, be arranged as a retaining element on the underside of the guide channel wall and designed to be attached to an edge of the dispenser housing. Additionally, a second retaining element can, for example, be a widened area of ​​one of the shoulders, designed to clamp onto a support bar of the dispenser housing. Supporting the guide profile against two parallel elements of the dispenser housing ensures stable attachment of the guide profile, so that its shoulders define a specific cutting plane.

[0019] With a wider shoulder, the adhesive strip can also be wider. This further improves the adhesion of the sheet material during cutting. The sheet material's fixation during cutting can be further enhanced by having an edge section of the dispenser housing's hinged lid press the sheet material against the wider adhesive strip when closed. This prevents the sheet material from shifting locally along almost the entire cutting line during cutting. This facilitates the creation of straight cut lines. Depending on the design of the guide profile, the shoulders can extend laterally outwards and / or inwards, encompassing protruding sections of the guide profile's wall.

[0020] An embodiment of the invention is described in more detail below with reference to some figures. These figures show Figure 1: A cutting device on a foil dispenser in perspective view; Figure 2: A blade of the cutting device. Figure 1 in a side view, Figure 3 the knife from Figure 2 In a perspective view obliquely from below, Figure 4: A detail of the cutting device made of Figure 1 In perspective view, Figure 5 shows a section of the arrangement. Figure 1 without the side wall of the dispenser housing, looking in the direction of movement of the knife.

[0021] Figure 1Figure 1 shows a cutting device 3 in a foil dispenser with a dispenser housing 1. The cutting device 3 comprises a guide profile 5, which is attached to the upper edge of a front wall of the dispenser housing 1, and a blade 7, which is slidably mounted on this guide profile 5 in and against a displacement direction indicated by the arrow P. The dispenser housing 1 includes a hinged lid 9, which is pivotally connected to the housing body about a pivot axis A located at the rear of the dispenser housing 1. A roll with a sheet 13, such as baking paper, wound onto a core 11 is rotatably mounted in the dispenser housing 1. An end section of the sheet 13 can be pulled out of the dispenser housing 1 through a dispensing opening between the hinged lid 9 and the guide profile 5 and cut off by sliding the blade 7.

[0022] As in the Figures 2 and 3As shown, the knife 7 comprises an operating element 15, which has a handle on its upper side with two concave gripping surfaces extending from a central dome and is connected at its lower side via a narrow neck 17 to a guide body 19 in the form of an approximately rectangular plate. The plate is arranged essentially parallel to the underside of the operating element 15. In cross-section, the plate 15 and the neck 17 have the shape of an inverted T. The knife 7 further comprises two blades 21, which are anchored laterally in the neck 17 and at the top of the operating element 15. Each blade 21 comprises a cutting edge 23 that extends from a central region of the guide body 19 at the neck 17 to an edge region of the underside of the operating element 15. Alternatively, instead of two blades 21, a single blade 21 with two cutting edges 23 could also be provided, as shown in Figure 2The blade 21 is anchored to the control element 15 and the neck 17. Each blade 21 can be anchored, for example, in a known manner using injection molding by injection molding or partial overmolding with plastic. In alternative embodiments, sections of each blade 21 can be positively connected to the control element 15 by two joined parts.

[0023] Each cutting edge 23 forms an angle of inclination α with the plate or guide body 19, preferably on the order of approximately 30°. The height H1 of the exposed area of ​​each cutting edge 23 is, for example, approximately 5 mm. The height H2 of the guide body 19, or the thickness of the plate, is significantly smaller and can, for example, be in the range of approximately 1.5 mm to approximately 2.5 mm.

[0024] Support elements 25, in the form of rib sections, project from a flat, approximately rectangular section of the underside of the control element 15. The height H3 of these support elements ranges from approximately 0.3 mm to approximately 1 mm and can, for example, be approximately 0.5 mm. The support elements 25 have a rounded cross-section. This means that the surface includes at least one convexly curved section and no sharp edges. Preferably, the cross-sections of the support elements 25 have at least approximately the shape of circular segments. This allows a comparatively high pressure to be applied locally to a surface 13 during cutting without damaging the surface 13.

[0025] The upper end regions of each cutting edge 23 are each surrounded by three U-shaped rib sections, one of which is arranged transversely to the respective direction of movement P of the knife 7. The lengths L1 of each of the adjacent rib sections arranged parallel to the direction of movement P of the knife 7 are shorter than half the total length L of the operating element 15 and preferably shorter than half the length of the substantially rectangular underside of the operating element 15. Between these rib sections, the underside of the operating element includes a central area without protruding ribs. This central area has a length L2, which is preferably greater than the length L1 of the adjacent rib sections. The length L1 can be, for example, on the order of about 4 mm to about 8 mm and, in particular, about 6 mm. The length L2 is preferably 1.5 to 2.5 times as long as L1.This allows for optimal concentration of the pressure force of the operating element 15 when cutting the surface structure 13. Preferably, the overall length L of the operating element 15 is in the range of approximately 35 mm to approximately 50 mm, and its height H is in the range of approximately 12 mm to approximately 18 mm. This ensures that the blade 7 can be easily moved, that sufficient pressure can be exerted on the surface structure 13 in the area of ​​the cutting edge 23, and that the space required for parking the blade 7 in one of the end regions of the guide profile 5 next to the surface structure 13 is comparatively small. The length of the guide body 19 is preferably approximately the same length as the underside of the operating element 15. This corresponds to the sum 2L1 + L2. Unless otherwise specified, stated values ​​and value ranges are to be understood as including values ​​and value ranges within a tolerance range of + / - 15%. Figure 4shows a section of the cutting device 3, wherein the guide body 19 of the knife 7 is slidably mounted in a guide channel 27 of the guide profile 5. Figure 4 shows a cross-section of such an arrangement, wherein the cutting device 3 is as shown in Figure 1 The guide profile 5 is attached to a dispenser housing 1. For this purpose, the guide profile 5 below the guide channel 27 includes a U-shaped clamping profile 29 which can be attached to the upper edge of a front wall 2 of the dispenser housing 1. At least one leg of the clamping profile 29 can include an inwardly projecting locking rib 30 or a corresponding other locking element for positive locking attachment to a folded or flanged edge of the housing wall.

[0026] On opposing wall sections of the guide channel 27, ribs 31 project inwards, defining a C-shaped cross-section structure in the lower section of the guide channel 27 for receiving the guide body 19. Above these ribs 31, sections of the wall of the guide channel 27 are curved or inclined such that they define a guide gap at the upper end, the width of which corresponds approximately to the width of the neck 17, allowing the knife 7 to be moved along the guide profile 5 with minimal play transversely to the direction of movement P. Adjacent to the upper wall sections, the guide profile 5 includes laterally projecting shoulders 33, the inner shoulder 33 being wider and comprising a downwardly projecting, elastically deformable end region 35.

[0027] The guide profile 5 is attached to the dispenser housing 1 by attaching the clamping profile 29 to the front panel 2. Upon contact with the support bar 4, the end section 35 of the inner shoulder 33 is first elastically deformed and then snaps into a final position, in which it holds the guide profile 5 to the support bar. The guide profile 5 is supported on the front panel 2 and on the support bar 4, which is arranged parallel to the upper edge of the front panel 2.

[0028] Each of the shoulders 33 includes an adhesive strip 37 on its upper side, for example a strip of co-extruded or otherwise attached soft PVC. The support elements 25 of the operating element 15 are arranged such that, during cutting, a section of the sheet structure 13 resting on the shoulders 33 is pressed against the adhesive strips 37 by the pressure exerted by the support elements 25.

[0029] Additionally, the surface assembly 13 can be fixed by the end region of the hinged lid 9, which rests on the surface assembly 13 in the area of ​​the inner adhesive strip 37. If the guide profile 5 is attached to the dispenser housing 1, this dispenser housing 1 is also part of the cutting device 3, since it comprises parts that interact with the guide profile 5 and the blade 7.

Claims

1. Cutting device (3) for baking paper, comprising a guide profile (5) and a knife (7) slidably mounted on this guide profile (5), wherein the guide profile (5) comprises wall sections which delimit a guide channel (27) and wall sections which define shoulders (33) adjacent to a guide gap of the guide profile (5), wherein the knife (7) comprises an operating element (15) and a guide body (19) which are connected to each other by a neck (17), wherein at least one blade (21) is anchored to the neck (17) and to the operating element (15), and wherein the guide body (19) is slidably mounted in the guide channel (27) in and opposite to a sliding direction (P) defined by the guide profile (5), wherein the operating element (15) comprises at least one support element (25) projecting from its underside and supported on at least one of the shoulders (33) of the guide profile (5), characterized in that the support element (25) comprises, on both sides next to the blade (21), a rib section arranged parallel to the sliding direction (P) of the knife 7, and that each of these parallel rib sections is supported on a respective one of the shoulders (33) of the guide profile (5), so that a sheet-like material (13) to be cut, such as baking paper, can be pressed against the shoulders (33) and fixed in position during sliding of the knife (7).

2. Cutting device (3) according to claim 1, characterized in that each blade (21) comprises at least one cutting edge (23) having an exposed region with a height (H1) of at least 3 mm and being inclined at an angle (α) in the range of 15° to 35° relative to the underside of the operating element (15).

3. Cutting device (3) according to one of claims 1 or 2, characterized in that the length (L1) of each of the parallel rib sections is less than half the total length of the underside of the operating element (15).

4. Cutting device (3) according to one of claims 1 to 3, characterized in that the support element (25) comprises a rib section arranged transversely to the sliding direction (P) and supported on both shoulders (33).

5. Cutting device (3) according to one of claims 3 to 4, characterized in that the rib sections have a rounded cross-sectional shape and a height (H3) in the range of 0.3 mm to 1.0 mm.

6. Cutting device (3) according to one of claims 1 to 5, characterized in that the operating element (15) comprises, on its upper side, a grip having two concavely curved gripping surfaces adjacent to a central dome.

7. Cutting device (3) according to one of claims 1 to 6, characterized in that the guide body (19) is a plate whose height (H2) is less than or equal to 2.5 mm, and that the guide profile (5) comprises a wall section having a C-shaped cross-section, which defines a section of the guide channel (27) adapted to the shape of the guide body (19), in which the guide body (19) is guided so as to be slidably mounted.

8. Cutting device (3) according to one of claims 1 to 7, characterized in that the guide profile (5) comprises, below the guide channel (27), a clamping profile (29) having a U-shaped cross-section.

9. Cutting device (3) according to claim 8, characterized in that the guide profile (5) is attached to the upper edge of the front wall (2) of a dispenser housing (1), that the dispenser housing (1) comprises a hinged lid (9), and that the hinged lid (9) comprises an edge section which, in a closed position, rests on the inner shoulder (33) of the guide profile (5).

10. Cutting device (3) according to claim 9, characterized in that the dispenser housing (1) comprises a support bar (4) parallel to the upper edge of the front wall (2), and in that the inner shoulder (33) of the guide profile (5) is supported on this support bar (4).

11. Cutting device (3) according to claim 10, characterized in that the inner shoulder (33) is snapped onto the support bar (4) by means of a downwardly projecting, elastically deformable end portion (35).

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