RU2534318C1 - Device for final forming of long flexible printed cables in thermoplastic insulation - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: device comprises the base, cutting wires, a carriage with feeding mechanism; the device is equipped with positioning unit for a printed cable blank. The positioning unit for a printed cable blank contains two fixing devices installed at the base, at that one of them is capable of longitudinal movement. The cutting wires are fixed with tension at spring-loaded brackets mounted at levers tied up by the spring and installed at the carriage so that they may be moved apart and brought into contact by rollers interacting with master cams at the beginning and at the end of cutting. The levers are equipped with levelling screws contacting the thrust fixed at the carriage in the process.

EFFECT: high accuracy of cutting and improvement of the ready cable quality.

3 cl, 5 dwg

Description

The invention relates to the field of production of electric cables for various purposes, in particular the manufacture of flexible printed cables.

Flexible printed cables are flat electrical conductors insulated with thermoplastic films. The insulation gaps between the conductors are approximately 0.5 mm. Often, conductors are formed simultaneously with pads of various configurations. One billet may contain several tens of conductors. To obtain cables with a given number of conductors from them, it is necessary to separate (cut) the workpiece along its entire length. Separation is carried out in various ways: by mechanical cutting with special knives, sawing devices, by means of a heated knife, removal of individual conductors to make room for cutting, etc.

A feature of the devices for the final formation of lengthy flexible printed cables with thermoplastic insulation is that their design and layout solutions must ensure high precision cutting of long workpieces and the quality of the finished cable.

A device for slitting for a flexographic machine according to the patent of the Russian Federation for utility model No. 64980, B26D 7/26, publ. 07/27/2007, containing at least one flat fixed knife fixed in the clamping bracket. The longitudinal cutting of the material is carried out when moving it.

This design of the slitting device allows the separation of the following types of materials: paper, fabric, etc.

However, this design does not allow for high-quality cutting of materials such as, for example, mylar film, since when it is cut, material sticks to the knife blade, as a result of which the straightness of the cut is violated, which leads to marriage when forming a flexible printed cable.

Thus, the objective of this technical solution was to provide a longitudinal cut for a certain type of material, such as paper.

Common features of the known technical solution with the design proposed by the authors is the presence of a cutting tool, in this case a knife.

The closest in technical essence and the achieved technical result is a method of cutting thermoplastic materials and a device for its implementation according to the patent of the Russian Federation No. 23225269, B26F 3/12, publ. 05/27/2008, adopted by the authors for a prototype containing a base, cutting wires heated by electric current, and a carriage with a feed mechanism.

This design of the device allows for the cutting of thermoplastic materials.

For reasons that impede the achievement of the following technical result when using the known device for cutting thermoplastic material, adopted by the authors for the prototype, the known device does not provide the required accuracy and quality of the cut, without damage to the conductors and their insulation. It also does not cut printed cables with enlarged contact pads at the ends of the conductors.

The common features of the known technical solution with the proposed device design for the final formation of long flexible printed cables with thermoplastic insulation is the presence of a base, cutting wires heated by electric current, and a carriage with a feed mechanism.

In contrast to the prototype, the device proposed by the authors is equipped with a positioning unit for preparing a flexible printed cable, including two clamps mounted on the base, one of them with the possibility of longitudinal movement, cutting wires are fixed with tension on spring brackets mounted on levers, spring-loaded and installed on the carriage with the possibility of dilution and convergence by means of rollers interacting with copiers at the beginning and end of cutting, and the levers are equipped with adjusting screws, contact they are cutting in the process of cutting with an emphasis fixed on the carriage.

In the particular case, i.e. in specific forms of execution, the invention is characterized by the following features:

- the clamps are in the form of pins or clamps, and the movable clamp is mounted on a spring-loaded slider,

- the diameter of the cutting wire is selected in the range of 0.15-0.3 mm.

It is this that allows us to conclude that there is a causal relationship between the totality of the essential features of the claimed technical solution and the achieved technical result.

These signs, distinctive from the prototype and to which the requested amount of legal protection applies, are sufficient in all cases.

The objective of the invention is to provide a device for the final formation of long flexible printed cables with thermoplastic insulation, ensuring high precision cutting of long cables and improve the quality characteristics of the resulting cable.

The specified technical result in the implementation of the invention is achieved by the fact that in the known device for the final formation of long flexible printed cables with thermoplastic insulation containing a base, two cutting wires heated by electric current, a carriage with a feed mechanism, the feature is that the device is equipped with a positioning unit blanks of a printed cable, including two clamps mounted on the base, one of them with the possibility of longitudinal movement, I cut The wires are fixed with tension on spring brackets mounted on levers, tightened by a spring and mounted on the carriage with the possibility of spreading and converging by means of rollers interacting with copiers at the beginning and end of cutting, and the levers are equipped with adjusting screws in contact with the stop fixed in the cutting process on the carriage.

A new set of structural elements, as well as the presence of connections between them, allows, in particular, due to the fact that:

- the device is equipped with a knot for positioning the blank of the printed cable, including two clamps mounted on the base, one of them with the possibility of longitudinal movement, precisely set the blank of the printed cable relative to the line of movement of the cutting wires and to ensure cutting accuracy without exposing the conductors in the cable;

- the cutting wires are fixed with tension on spring brackets mounted on levers, tightened by a spring and mounted on the carriage with the possibility of spreading and converging by means of rollers interacting with the copiers at the beginning and end of cutting, and the levers are equipped with adjusting screws that contact with the stop in the process of cutting, fixed on the carriage, to obtain the desired quality characteristics of the cable, such as, for example, cable width, insulation integrity, the safety of contact pads, etc.

Signs characterizing the invention in specific forms of execution, allow, in particular, due to the fact that:

- the clamps are in the form of pins or clamps, and the movable clamp is mounted on a spring-loaded slider, to ensure cutting accuracy due to the constant tension of the workpiece of a flexible printed cable;

- the diameter of the cutting wire is chosen in the range of 0.15-0.3 mm, to ensure the minimum cutting width, without destroying the integrity of the insulation of the conductors in the cable.

The essence of the invention lies in the fact that in the known device for the final formation of long flexible printed cables with thermoplastic insulation, containing a base, cutting wires heated by electric current, a carriage with a feed mechanism, in contrast to the prototype according to the invention, the device is equipped with a positioning unit for preparing a printed cable, including two clamps mounted on the base, and one of them is with the possibility of longitudinal movement, cutting wires are fixed with tension it on the spring brackets mounted on the levers, fastened together by a spring and mounted on a carriage, with dilution and toe clips by interacting with cams at the beginning and end of cutting and levers provided with adjusting screws, in contact during cutting with an abutment fixed to the carriage.

The essence of the invention is illustrated by drawings, in which Fig. 1 shows a general view of a device for the final formation of long flexible printed cables with thermoplastic insulation, Fig. 2 is a sectional movable contact, Fig. 3 is a view of a mounting unit of cutting wires on a carriage, figure 4 is a top view of the attachment point of the cutting wires in the initial position of the carriage, figure 5 is a top view of the attachment point of the cutting wires at the time of cutting.

The proposed device for the final formation of long flexible printed cables with thermoplastic insulation contains a base 1, a feed mechanism 2 carriages 3, cutting wires 4. Based on 1, a positioning unit 5 is installed, including a retainer 6 in the form of a pin and a movable retainer 7 in the form of a clip mounted on spring-loaded slider 8 and displaced by the spring 9 to the right. The cutting wires 4 are fixed with tension on the spring brackets 10 mounted on the levers 11, which are mounted on the carriage 3 with the possibility of spreading and converging when turning relative to the axis 12. The levers 11 are pulled by a spring 13 and provided with rollers 14, which in the extreme positions of the carriage 3 interact with copiers 15, mounted on the base 1. The levers 11 are equipped with adjusting screws 16, which during cutting are in contact with the stop 17.

A device for the final formation of long flexible printed cables with thermoplastic insulation works as follows.

At the beginning of operation, the carriage 3 is in one of the extreme positions. The cable blank is installed with the ends on the clamps 6 and 7 (Figs. 1, 2, 4), while one end with the hole is put on the clamp 6, and the other end is fixed with the clamp clamp 7, moving the slider 8 towards the cable blank, overcoming the force of the spring 9 . After clamping the end of the workpiece from the latch 7 remove the force. Under the action of the spring 9, the slider 8 is shifted by pulling the cable blank along the cutting line, ensuring its accurate positioning relative to the cutting wires 4. In the initial position (figure 4), the divorced arms 11 are supported by the rollers 14 on the copier 15. When the carriage 3 moves towards the cable blank the rollers 14 are run around the contour of the copier 15, ensuring the convergence of the levers 11 under the action of the spring 13.

The cutting wires 4, to which voltage is supplied, bypass the contact pads of the cable blank and come into contact with the interconductor insulation (Fig. 5), while the levers 11 through the adjusting screws 16 are in contact with the stop 17, providing a predetermined distance between the cutting wires 4. the movement of the carriage 3, the cutting wire 4 is moved along the cable blank, cutting the interconductor insulation. The width of the cut is determined by the diameter of the wire, which is selected in the range of 0.15-0.343 mm depending on the cutting speed. At the end of the cycle, the rollers 14 interact with the copier 15 mounted on the other end of the device, while the levers 11 are pushed apart, releasing the formed cable, which is removed by separating from the latches 6 and 7. The cable forming cycle is completed.

The use of the device for the final formation of long flexible printed cables with thermoplastic insulation in accordance with the invention provides high precision cutting and cable quality.

Currently, in accordance with the invention, design documentation has been developed for a device for the final formation of long flexible printed cables with thermoplastic insulation. In accordance with the design documentation, a prototype device was manufactured.

The indicated positive effect is confirmed by tests carried out on a sample device for the final formation of long flexible printed cables with thermoplastic insulation.

Claims (3)

1. A device for the final formation of long flexible printed cables with thermoplastic insulation, containing a base, cutting wires heated by electric current, and a carriage with a feed mechanism, characterized in that it is equipped with a positioning unit for the blank of the printed cable, including two clamps mounted on the base, moreover, one of them is with the possibility of longitudinal movement, cutting wires are fixed with tension on spring brackets mounted on levers, tensioned by a spring and installed on the carriage with the possibility of dilution and convergence by means of rollers interacting with the copiers at the beginning and end of cutting, and the levers are equipped with adjusting screws that are in contact during the cutting process with a stop fixed on the carriage. 2. The device according to claim 1, characterized in that the latches are made in the form of pins or clamps, and the movable latch is mounted on a spring-loaded slider. 3. The device according to claim 1, characterized in that the diameter of the cutting wire is selected in the range of 0.15-0.3 mm.

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