Wire feeding device for printing equipment

Abstract

The utility model discloses a wire feeding device for printing equipment. The wire feeding device comprises a wire feeding box; a driving wheel, a driven wheel, a moving part and a sensor. The driving wheel and the driven wheel are contained in the wire feeding box, and a wire feeding gap is formed between the driving wheel and the driven wheel. A driven wheel is rotatably arranged on the moving part, and the moving part is movably mounted on the wire feeding box so as to adjust the size of the wire feeding gap; the sensor is arranged in the wire feeding box, a monitoring head used for monitoring the driven wheel or the rotating speed of the driven wheel is formed at the end of the sensor, and the moving part adjusts the wire feeding gap according to the rotating speed. The rotating speed of the driving wheel or the driven wheel can be monitored in real time through the sensor, when the rotating speed changes abnormally, the moving part is moved to adjust the size of the wire feeding gap, abnormal conditions such as clamping stagnation and slipping of wires are avoided, it is guaranteed that the wire feeding process is continuous and stable, and the wire feeding quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to additive manufacturing technical field especially is related to a wire feeding device for printing equipment. BACKGROUND

[0002] In the related art, in the field of additive manufacturing (3D printing), the wire material is continuously and stably conveyed to the printing point by the wire feeding mechanism. However, due to the assembly error of the wire feeding mechanism itself, the fault during operation, and other reasons, the wire feeding mechanism may have abnormal working conditions such as wire material jamming and slipping during operation, which seriously affects the printing precision and printing quality. SUMMARY

[0003] The utility model discloses at least one of the technical problems existing in the prior art. To this end, the purpose of the utility model is to provide a wire feeding device for printing equipment, which can monitor the stability of the wire feeding speed in real time, adjust the size of the wire material passing gap, avoid the occurrence of wire material jamming and slipping, and ensure the printing quality.

[0004] The utility model discloses an embodiment of a wire feeding device for printing equipment, which comprises a wire feeding box, a driving wheel, a driven wheel, a sensor and a moving part. The driving wheel and the driven wheel are accommodated in the wire feeding box, and a wire feeding gap is formed between the driving wheel and the driven wheel. The moving part is rotatably provided with the driven wheel, and the moving part is movably installed in the wire feeding box to adjust the size of the wire feeding gap. The sensor is arranged in the wire feeding box, and the end of the sensor is provided with a monitoring head for monitoring the rotating speed of the driving wheel or the driven wheel. The moving part adjusts the wire feeding gap according to the rotating speed.

[0005] According to the wire feeding device of the utility model, the gap between the driving wheel and the driven wheel of the wire feeding device can be adjusted, so that the distance between the driving wheel and the driven wheel is adjusted according to the wire feeding speed, the pressure on the wire material is adjusted, and the wire material does not slip or jam during the conveying process, thereby improving the printing precision and printing quality.

[0006] According to some embodiments of the utility model, the moving mode of the moving part is rotation relative to the wire feeding box or translation relative to the wire feeding box.

[0007] According to some embodiments of the utility model, the moving part comprises a movable piece, one end of the movable piece is pivotally arranged in the wire feeding box, the side of the movable piece is provided with a protruding mounting part, and the driven wheel is rotatably arranged on the mounting part. The pivot shafts of the movable piece are arranged in parallel with the pivot shafts of the driving wheel and the driven wheel.

[0008] According to further embodiments of the present application, the wire feeding device further comprises: a driving member, the driving member is arranged on the wire feeding box, a driving end is formed on the driving member, the driving end is adapted to be connected with the movable member and drive the movable member to rotate to adjust the wire feeding gap.

[0009] According to further embodiments of the present application, the wire feeding device further comprises: an elastic member, the elastic member is connected between the driving end and the movable member.

[0010] According to further embodiments of the present application, a matching hole is formed on the wire feeding box, an internal thread is formed inside the matching hole, an external thread is arranged on the outer circumferential surface of the driving member and engages with the internal thread, and the driving member rotates relative to the matching hole to move the driving end.

[0011] According to some embodiments of the present application, the wire feeding device further comprises: a limiting part, the limiting part is arranged on the wire feeding box, at least part of the limiting part faces the moving part in the moving direction, and the limiting part is adapted to limit the moving range of the moving part.

[0012] According to further embodiments of the present application, the limiting part is configured as a limiting rod movably arranged on the wire feeding box, the limiting rod is selectively extended into the wire feeding box, and a matching hole matched with the limiting rod is formed on the moving part.

[0013] According to some embodiments of the present application, the wire feeding device further comprises: a wire inlet head and a print head, the wire inlet head and the print head are arranged on the wire feeding box, the outlet of the wire inlet head and the inlet of the print head face each other and are accommodated inside the wire feeding box; wherein the driving wheel and the driven wheel are arranged between the outlet of the wire inlet head and the inlet of the print head.

[0014] According to some embodiments of the present application, the sensor is arranged on the side of the driven wheel away from the driving wheel.

[0015] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0017] Figure 1 is a front view of one or some embodiments of the present application;

[0018] Figure 2 is a perspective view of one or some embodiments of the present application.

[0019] REFERENCE NUMERALS:

[0020] wire feeding device 100;

[0021] 10 wire feed box; 20 drive wheel; 30 driven wheel;

[0022] Mobile part 40;

[0023] Movable part 41; Mounting part 411; Connecting part 412;

[0024] Drive component 42; Drive end 421; Elastic component 43;

[0025] Sensor 50; Monitoring head 51; Limiting part 60; Limiting rod 61; Limiting hole 62; Wire feed head 70; Print head 80. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] The following is for reference. Figures 1-2 The present invention describes a filament feeding device 100 for a printing device according to an embodiment of the present invention. The filament feeding device 100 can be applied to any additive manufacturing system, i.e., a 3D printing system, that uses filament as a substrate.

[0028] like Figure 1 , Figure 2 As shown, the wire feeding device 100 according to an embodiment of the present invention includes: a wire feeding box 10, a driving wheel 20 and a driven wheel 30, a moving part 40, and a sensor 50. The driving wheel 20 and the driven wheel 30 are housed inside the wire feeding box 10, and a wire feeding gap is formed between the driving wheel 20 and the driven wheel 30; the driven wheel 30 is rotatably disposed on the moving part 40, and the moving part 40 is movably mounted on the wire feeding box 10 to adjust the size of the wire feeding gap; the sensor 50 is disposed on the wire feeding box 10, and a monitoring head 51 for monitoring the rotational speed of the driving wheel 20 or the driven wheel 30 is formed at the end of the sensor 50; the moving part 40 adjusts the wire feeding gap according to the rotational speed.

[0029] It should be noted that in the wire feeding process of the wire feeding device 100 in the embodiment of the present application, the wire material passes through the wire feeding gap and is extruded by the driving wheel 20 and the driven wheel 30, and the driving wheel 20 drives the transmission by friction, while the wire material drives the driven wheel 30 to rotate. The change state of the rotation speed of the driving wheel 20 or the driven wheel 30 directly reflects the change state of the wire feeding speed. If the extrusion force is too large, the wire feeding device 100 will appear abnormal working conditions of wire material jam, and the rotation speed of the driving wheel 20 and the driven wheel 30 will be reduced; if the extrusion force is too small, the wire feeding device 100 will appear abnormal working conditions of wire material slip, and the rotation speed of the driven wheel 30 will be reduced in a short time while the rotation speed of the driving wheel 20 will be increased; if the extrusion force disappears, the rotation speed of the driven wheel 30 will be zero while the rotation speed of the driving wheel 20 will gradually approach the output rotation speed of the driving motor.

[0030] According to the wire feeding device 100 in the embodiment of the present application, the sensor 50 can identify the signal of abnormal working conditions by monitoring the rotation speed of the driving wheel 20 or the driven wheel 30 in real time through the monitoring head 51, that is, the dynamic change of the rotation speed, that is, the dynamic change of the wire feeding speed. According to the monitoring data of the sensor 50, the moving part 40 moves relative to the wire feeding box 10 and drives the driven wheel 30 to move synchronously, so that the driven wheel 30 approaches or moves away from the driving wheel 20, and then the wire feeding gap is changed to be smaller or larger, the extrusion force and friction force generated by the driving wheel 20 and the driven wheel 30 on the wire material are changed, the development of abnormal working conditions is avoided, and the wire material can be stably transmitted.

[0031] According to the wire feeding device 100 in the embodiment of the present application, the gap between the driving wheel 20 and the driven wheel 30 of the wire feeding device according to the present application can be adjusted, so that the distance between the driving wheel 20 and the driven wheel 30 is adjusted according to the wire feeding speed, the pressure on the wire material is adjusted, and the wire material will not slip or jam in the conveying process, and the printing precision and printing quality are improved.

[0032] In some embodiments of the present application, the moving mode of the moving part 40 is rotation relative to the wire feeding box 10 or translation relative to the wire feeding box 10.

[0033] The wire feeding device drives the driven wheel 30 to approach or move away from the driving wheel 20 by setting the moving part 40 to translate or rotate, so as to adjust the distance between the driving wheel 20 and the driven wheel 30, and then change the pressure on the wire material, so as to ensure that the wire material will not slip or jam in the conveying process, and improve the printing precision and printing quality.

[0034] According to some embodiments of the present application, the moving part 40 rotates relative to the wire feeding box 10, for example, Figure 1As shown, the moving part 40 comprises a movable piece 41, one end of the movable piece 41 is pivotally arranged on the wire feeding box 10, a protruding mounting part 411 is formed on the side of the movable piece 41, and the driven wheel 30 is rotatably arranged on the mounting part 411; wherein the pivot axes of the movable piece 41 are arranged in parallel with the pivot axes of the driving wheel 20 and the driven wheel 30.

[0035] The movable piece 41 is simply mounted through the connection of the pivot axes and the wire feeding box 10, the movable piece 41 can rotate around the pivot axes relative to the wire feeding box 10, and the torque is utilized to make the movable piece more easily drive the driven wheel 30 to approach or move away from the driving wheel 20 to adjust the wire feeding gap, and the operation is more labor-saving; further, the movable piece 40 rotatably arranges the driven wheel 30 through the protruding mounting part 411 formed on the side, so that the driven wheel 30 is more close to the driving wheel 20 in the limited space inside the wire feeding box 10, the structure inside the wire feeding box 10 is compact, and meanwhile, the movable piece 41 can be prevented from interfering with the fixed structure and the driving structure connected with the driving wheel 20 to ensure the stability of the wire feeding process.

[0036] According to some embodiments of the present application, the wire feeding device 100 further comprises a driving piece 42, the driving piece 42 is arranged on the wire feeding box 10, a driving end 421 is formed on the driving piece 42, and the driving end 421 is adapted to be connected with the movable piece 41 and drive the movable piece 41 to rotate to adjust the wire feeding gap.

[0037] When the driving piece 42 acts, the driving end 421 acts on the movable piece 41 to drive the movable piece 41 to rotate around the pivot axes, so as to drive the driven wheel 30 to approach or move away from the driving wheel 20, and then adjust the size of the wire feeding gap. It should be noted that the driving piece 42 can be an electric control structure or a pure mechanical structure, and its operation can be manually operated or automatically operated through signal transmission with the sensor 50, so as to improve the automation degree of the wire feeding device 100.

[0038] According to some embodiments of the present application, a matching hole is formed on the wire feeding box 10, an internal thread is formed in the inside of the matching hole, an external thread matched with the internal thread is arranged on the outer circumferential surface of the driving piece 42, and the driving piece 42 is rotated relative to the matching hole to move the driving end 421.

[0039] The driving member 42 is connected with the wire feeding box 10 through thread cooperation, the installation of the driving member 42 is realized, and the cooperation structure is provided for the action of the driving member 42. The driving member 42 and the wire feeding box 10 adopt the thread cooperation mode, the movement of the driving member 42 is more stable, the driving member 42 can make the movable member 41 adjust the extrusion force between the driven wheel 30 and the driving wheel 20 more accurately in the process of driving the movable member 41, and the printing precision and the printing quality are improved. When the driving member 42 rotates into or rotates out of the wire feeding box 10, the driving end 421 pushes or pulls the movable member 41 to move, the movable member 41 drives the driven wheel 30 to move close to or away from the driving wheel 20, and therefore the size of the wire feeding gap is adjusted. In some embodiments, the driving member 42 can be selected as a screw, the structure is simplified, and manual operation is easy.

[0040] It should be noted that in the process that the driving member 42 drives the moving part 40 to move, the displacement of the moving part 40 is small and needs to be gradually performed according to the monitoring data of the sensor 50, if the operation is improper, the wire material is easily extruded excessively or even the parts collide, which directly leads to the damage of the wire material and the structure.

[0041] In order to solve the above problems, in some embodiments of the utility model, the wire feeding device 100 further comprises: an elastic member 43, the elastic member 43 is connected between the driving end 421 and the movable member 41. The elastic member 43 plays a role in motion transmission from the driving member 42 to the movable member 41, and at the same time, the elastic member 43 can play a buffering effect, so that the action of the movable member 41 is slower in time and smaller in space than the action of the driving end 421. In this embodiment, by arranging the elastic member 43, the elastic member 43 can be deformed between the driving end 421 and the movable member 41, so that the action amplitude of the movable member 41 is smaller than that of the driving end 421, the driving end 421 is prevented from directly acting on the movable member 41 to cause the wire feeding gap to be too small and the extrusion force of the driving wheel 20 and the driven wheel 30 on the wire material to be too large, so that the wire material is prevented from being stuck or broken, and the structure is protected to enable the wire material to run stably. At the same time, the elastic member 43 also provides a compression space for the movement of the movable member 41 towards the driving end 421, so that the driven wheel 30 can move towards the driving end 421 when the pressure is too large, and the pressure between the driving wheel 20 and the driven wheel 30 is prevented from increasing instantaneously to cause the wire material to be stuck or broken.

[0042] As shown in FIG. 1, Figure 1 In some embodiments, the elastic member 43 can be configured as a spring, based on which, as shown in FIG. 2, Figure 2 The movable member 41 is formed with a connecting part 412 for fixing one end of the spring, the connecting part 412 is formed with a clamping groove for clamping the spring, and the spring connects the driving end 421 and the connecting part 412.

[0043] In the embodiment, when the connecting portion 412 is connected with the spring, the end of the spring can be directly clamped into the clamping groove, without deforming the end of the spring or adding a connecting mechanism, so that the installation is simple and efficient; and the clamping groove is connected without affecting the deformation of the spring structure, and has high stability, so that the spring is not easy to fall off.

[0044] Further, one end of the movable piece 41 is rotationally connected with the wire feeding box 10 through a pivot shaft, and in the extension direction of the other end of the movable piece 41, the connecting portion 412 can be arranged at any position different from the mounting portion 411, so that the adjustment range of the movable piece 41 by a unit action of the driving piece 42 is different: the closer the connecting portion 412 is to the pivot shaft, the smaller the force arm of the rotation torque of the movable piece 41 applied by the driving piece 42, and the greater the action range of the movable piece 41 driven by a unit action of the driving piece 42; the farther the connecting portion 412 is from the pivot shaft, the greater the force arm of the rotation torque of the movable piece 41 applied by the driving piece 42, and the smaller the action range of the movable piece 41 driven by a unit action of the driving piece 42. In the embodiment, the adjustment range of the movable piece 41 is changed by selecting the arrangement position of the driving piece 42 and the connecting portion 412, so that the precision and efficiency of the movement of the moving portion 40 are improved, and the adjustment range of the wire feeding gap size is further improved, so that the problem of over operation is avoided.

[0045] In view of the problem of over operation of the driving piece 42, in some embodiments, the wire feeding device 100 further comprises a limiting portion 60, the limiting portion 60 is arranged on the wire feeding box 10, at least part of the limiting portion 60 is opposite to the moving portion 40 in the moving direction, and the limiting portion 60 is adapted to limit the moving range of the moving portion 40.

[0046] At least part of the limiting portion 60 is opposite to the moving portion 40 in the moving direction, when the moving portion 40 moves to a certain position, the moving portion 40 will contact the part of the limiting portion 60 opposite to the moving portion 40 in the moving direction, the limiting portion 60 abuts against the moving portion 40 and prevents the moving portion 40 from continuing to move in the moving direction, so that the moving range of the moving portion 40 and the driven wheel 30 has a critical value, effectively preventing the moving portion 40 from moving excessively and colliding with other structures, and ensuring the stability of the wire feeding process.

[0047] In some embodiments, the limiting portion 60 is configured as a limiting rod 61 movably arranged on the wire feeding box 10, the limiting rod 61 can be selectively inserted into the wire feeding box 10, and the moving portion 40 is formed with a cooperation hole matched with the limiting rod 61. Figure 1 、 Figure 2As shown, the limiting rod 61 is connected and fixed with the moving part 40 through the matching hole, and the moving part 40 drives the limiting rod 61 to move synchronously when moving; the wire feeding box 10 is provided with a limiting hole 62, the limiting rod 61 penetrates through the limiting hole 62, and the limiting hole 62 forms a moving space of the limiting rod 61; when the limiting rod 61 moves, the limiting rod 61 moves to the critical position and stops against the inner wall surface of the limiting hole 62, thereby effectively preventing the displacement of the moving part 40 from being excessive. In the embodiment, the limiting rod 61 extends out of the wire feeding box 10 through the limiting hole 62, the limiting rod 61 moves synchronously with the moving part 40, so that the moving process of the moving part 40 is visible externally, and the moving range of the moving part 40 is visible externally, so as to operate the driving part 42, thereby improving the reliability and delicacy of the operation of the driving part 42 and reducing the operation failure.

[0048] According to some embodiments of the present application, Figure 1 As shown, the wire feeding device 100 further comprises a wire inlet head 70 and a printing head 80, the wire inlet head 70 and the printing head 80 respectively extend into the inside of the wire feeding box 10, and the outlet of the wire inlet head 70 and the inlet of the printing head 80 are arranged opposite to each other; wherein the driving wheel 20 and the driven wheel 30 are arranged between the outlet of the wire inlet head 70 and the inlet of the printing head 80.

[0049] After the wire material enters the wire feeding box 10 from the wire inlet head 70, the wire material is driven by the combination of the driving wheel 20 and the driven wheel 30 and is output through the printing head 80. The outlet of the wire inlet head 70 and the inlet of the printing head 80 are arranged opposite to each other, and the driving wheel 20 and the driven wheel 30 are arranged between the outlet of the wire inlet head 70 and the inlet of the printing head 80, so that the wire material is basically transported in a straight path, and the wire material only bears the extrusion force of the driving wheel and the driven wheel and the friction force for driving the wire material to be transported during transportation, so that the wire material can be prevented from being affected by other acting forces during transportation and from being stuck, and the printing precision and the printing quality are further ensured.

[0050] In some embodiments of the present application, Figure 1 As shown, the sensor 50 is arranged on the side of the driven wheel 30 away from the driving wheel 20, and is used for monitoring the rotating speed of the driven wheel 30. In some embodiments of the present application, the sensor 50 can also be arranged on the side of the driving wheel 20 away from the driven wheel 30, and is used for monitoring the rotating speed of the driving wheel 20. In some embodiments of the present application, two groups of sensors 50 can be arranged on the sides of the driving wheel 20 and the driven wheel 30 away from each other, and are respectively used for monitoring the rotating speeds of the driving wheel 20 and the driven wheel 30.

[0051] The sensor 50 can recognize the dynamic change of the rotating speed of the driving wheel 20 or the driven wheel 30, and thus recognize the signal of the abnormal working condition, by monitoring the rotating speed of the driving wheel 20 or the driven wheel 30. When the sensor 50 is provided with two groups of sensors for monitoring the rotating speed of the driving wheel 20 and the driven wheel 30 respectively, the monitoring results can be verified by comparing the monitoring data of the two groups of sensors, and the monitoring failure caused by the failure of one group of sensors can be avoided, so that the reliability of the sensor 50 is improved, the stability and reliability of the wire feeding device are ensured, and the printing precision and the printing quality are ensured.

[0052] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0053] In the description of the present application, "first feature" and "second feature" can include one or more features.

[0054] In the description of the present application, "a plurality of" means two or more.

[0055] In the description of the present application, "above" or "below" of the first feature to the second feature can include direct contact of the first and second features, or indirect contact of the first and second features through another feature therebetween.

[0056] In the description of the present application, "above", "above" and "above" of the first feature to the second feature include the first feature directly above and obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height.

[0057] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] Although the embodiments of the utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A wire feeding device for a printing apparatus, characterized by, The application relates to a wire feeding box. The wire feeding box comprises a driving wheel and a driven wheel, the driving wheel and the driven wheel are accommodated inside the wire feeding box, a wire feeding gap is formed between the driving wheel and the driven wheel; A moving part is provided with the driven wheel rotatably, the moving part is movably installed on the wire feeding box to adjust the size of the wire feeding gap; A sensor is arranged on the wire feeding box, and the sensor is arranged on the side of the driving wheel away from the driven wheel and / or on the side of the driven wheel away from the driving wheel; the end of the sensor is provided with a monitoring head for monitoring the rotating speed of the driving wheel or the driven wheel, and the moving part adjusts the wire feeding gap according to the rotating speed. The moving mode of the moving part is rotation relative to the wire feeding box or translation relative to the wire feeding box.

2. The wire feeder of claim 1, wherein, The moving part comprises:

3. The wire feeder of claim 2, wherein, A movable piece is pivotally arranged at one end of the wire feeding box, the side of the movable piece is provided with a protruding mounting part, and the driven wheel is rotatably arranged on the mounting part; wherein The pivot shafts of the movable piece are arranged in parallel with the pivot shafts of the driving wheel and the driven wheel. Further comprising:

4. The wire feeder of claim 3, wherein, A driving piece is arranged on the wire feeding box, the driving piece is provided with a driving end, the driving end is adapted to be connected with the movable piece and drive the movable piece to rotate to adjust the wire feeding gap. Further comprising:

5. The wire feeder of claim 4, wherein, An elastic piece is connected between the driving end and the movable piece. The wire feeding box is provided with a matching hole, the inside of the matching hole is provided with an internal thread, the outer periphery of the driving piece is provided with an external thread matched with the internal thread, and the driving piece is rotated relative to the matching hole to move the driving end.

6. The wire feeder of claim 5, wherein, Further comprising:

7. The wire feeder of claim 1, wherein, A limiting part is arranged on the wire feeding box, at least part of the limiting part is opposite to the moving part in the moving direction, and the limiting part is adapted to limit the moving range of the moving part. The limiting part is configured as a limiting rod movably arranged on the wire feeding box, the limiting rod can be selectively inserted into the wire feeding box, and the moving part is provided with a matching hole matched with the limiting rod.

8. The wire feeder of claim 7, wherein, Further comprising:

9. A wire feeder as claimed in any of claims 3 to 8, wherein, A wire feeding head and a printing head are arranged on the wire feeding box, and the outlet of the wire feeding head is arranged opposite to the inlet of the printing head; wherein The driving wheel and the driven wheel are arranged between the outlet of the wire feeding head and the inlet of the printing head. ​

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