Device for cutting an electrical shield to length

Abstract

Device for cutting to length an electrical shield (13) of a cable (12), wherein the device (1) has at least one pair of scissors (16) formed by at least two blades (14, 15) which grasp and cut the shield (13) between them, characterized in that the blades (14, 15) are hollow cylindrical and coaxial to each other, wherein the cutting edges (17) of the blades (14, 15) are ring-shaped and at least one of the blades (14, 15) is axially displaceable in order to perform a cutting motion.

Description

[0001] The invention relates to a device for cutting the electrical shielding of a cable to length. The device comprises at least one pair of scissors, which consists of at least two blades. The shielding is gripped and cut between the blades of the at least one pair of scissors.

[0002] It is known to cut cable shields to length using a utility knife. This involves cutting the shield radially, but improper handling can damage the underlying dielectric. Even slight changes in the shape of the dielectric can alter the cable's characteristic impedance, leading to undesirable reflections of electrical signals within the cable, particularly in high-frequency applications.

[0003] It is also known to spread shielding away from the dielectric, a common practice, especially with braided shielding. The shielding is then cut away around the entire cable using side cutters. This procedure is relatively tedious and therefore time-consuming. Furthermore, it is not applicable to foil shielding.

[0004] The invention is based on the objective of creating a device for cutting the electrical shielding of a cable to length, which is easy to handle, safe and repeatable.

[0005] This problem is solved according to the invention with the following features.

[0006] A device according to the invention is used for cutting the electrical shielding of a cable to length. The device comprises at least one pair of shears, which is formed by at least two blades. These blades grip the shielding between them and can thus cut through it. The blades are hollow cylindrical and coaxial to each other, enabling them to cut through the entire shielding with a single cut. For this purpose, the blades are provided with ring-shaped cutting edges that can shear off the shielding. To carry out the cutting process, at least one of the blades is axially displaced, thereby performing the cutting motion. In contrast to radial displacement, this does not damage or deform the dielectric material beneath the shielding in any way.Furthermore, this method results in very precise cutting to length, as the entire shielding is separated in a single operation. This ensures high repeatability. Since there is no longer any need to consider the dielectric material beneath the shielding, errors are eliminated, resulting in particularly easy handling.

[0007] To ensure the blades are correctly aligned, it is advantageous for them to be mounted on holders that have at least one axial sliding guide. This prevents radial movement of the holders relative to each other, resulting in precise blade alignment and thus a good cutting result.

[0008] To facilitate easy cable insertion into the device, it is advantageous if at least one of the brackets has a through-hole. This at least one through-hole is preferably positioned coaxially with the blades, so that the cable can simply be inserted into the at least one through-hole and is thus already correctly aligned with the blades.

[0009] To trigger the cutting process in the simplest and most precise way possible, it is advantageous if at least one of the holders is motor-driven. This motor drive then provides the desired axial movement that initiates the cutting process.

[0010] Alternatively or additionally, at least one of the brackets can be equipped with at least one handle to allow manual axial adjustment of the bracket. This significantly reduces costs, as no electrical components are then required within the device.

[0011] To prevent the blades from jamming during the cutting process, it is advantageous if at least one of the blades has a conical cut. This cut creates a gap extending from the cutting edges, preventing, for example, broken wires from blocking the blade.

[0012] To achieve good shearing action, it is advantageous if at least one of the blades has a conical cutting edge. This results in a precise cutting action and thus increases the reproducibility of the cutting performance.

[0013] For the device to function reliably, it is essential that the shielding is guided between the blades. To ensure this is achieved under all circumstances, it is advantageous if at least one of the holders has a shield expander. When the cable is inserted, this expands the shielding sufficiently to force it over the blade, thus reliably cutting the shield.

[0014] The subject matter of the invention is explained by way of example with reference to the drawing, without limiting the scope of protection.

[0015] It shows: Fig. 1 a schematic spatial, partially cutaway representation of a device according to the invention and Fig. 2 a sectional view of a detail of the device according to Fig. 1.

[0016] A device 1 according to Fig. The device 1 has a fixed support 2 and a movable support 3. The movable support 3 is mounted on a spindle 4, which is driven by an electric motor 5. Alternatively or additionally, the movable support 3 has a handle 6, which allows the support 3 to be moved manually.

[0017] Between the brackets 2 and 3, guides 7 in the form of bolts 8 and precisely fitting bores 9 are provided, which allow axial movement in direction 10 but prevent other movements. The two brackets 2 and 3 have through holes 11, through which a cable 12 passes. The cable 12 has a shield 13, which is to be cut to length by the device 1.

[0018] Blades 14 and 15 are provided on the two brackets 2 and 3. These blades are shaped coaxially and are essentially hollow cylindrical. Together, the blades 14 and 15 form a scissor 16, which cuts through the shield 13 when the blade 14 moves axially.

[0019] The scissors 16 are shown in detail according to Fig. 2 explained in more detail.

[0020] The blade 14 has a conical cutting edge 17 to cut through the shielding 13 as effectively as possible. To prevent the blades 14 and 15 from jamming against each other, the blade 15 has a conical clearance 18 that forms an opening wedge-shaped space with the inside of the blade 14. Cut wire pieces can move freely in this space without jamming the blades 14 and 15 together.

[0021] In the area of ​​blade 14, a shield expander 19 is also provided, which reliably pushes the shield 13 over the blade 14 in order to then cut it between the blades 14 and 15. This shield expander 19 is axially displaceable and spring-loaded so that it does not impede the axial movement of the blades 14 and 15.

[0022] This device 1 is used to cut the electrical shielding 13 of a cable 12 to length, wherein the shielding 13 is cut in a ring shape by axial movement of blades 14, 15. In particular, at least one of the blades 14, 15 is driven by a motor. Reference symbol list 1 Device 2 brackets 3 brackets 4 spindles 5 electric motor 6. Handle 7 Leadership 8 bolts 9 bore 10 axial direction 11 Through hole 12 cables 13 Shielding 14 blade 15 blades 16 Scissors 17 cutting 18 conical free cut 19 Umbrella expanders

Claims

[1] Device for cutting to length an electrical shield (13) of a cable (12), wherein the device (1) has at least one pair of scissors (16) formed by at least two blades (14, 15) which grasp and cut the shield (13) between them, characterized by , that the blades (14, 15) are shaped as hollow cylinders and coaxial to each other, wherein the cutting edges (17) of the blades (14, 15) are ring-shaped and at least one of the blades (14, 15) is axially displaceable in order to perform a cutting motion. [2] Device according to claim 1, characterized by , that the blades (14, 15) are attached to holders (2, 3) which have at least one axial guide (7) which prevents at least one radial movement of the holders (2, 3) relative to each other. [3] Device according to claim 2, characterized by , that at least one of the supports (2, 3) has at least one through-hole (11) for passing the cable (12). [4] Device according to claim 2 or 3, characterized by , that at least one of the brackets (2, 3) is motor-driven. [5] Device according to at least one of claims 2 to 4, characterized by , that at least one of the holders (2, 3) has at least one handle (6) for adjusting the at least one holder (2, 3) by hand. [6] Device according to at least one of claims 1 to 5, characterized by , that at least one of the blades (14, 15) is conically cut. [7] Device according to at least one of claims 1 to 6, characterized by , that at least one of the blades (14, 15) is conical in the area of ​​the cutting edge (17). [8] Device according to at least one of claims 1 to 7, characterized by , that at least one of the holders (2, 3) has at least one shield expander (19) which, when the cable (12) is inserted, presses the shield (13) over one of the blades (14, 15).

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