JP4650350B2 - Electric wire marking method and apparatus - Google Patents

Description

  The present invention relates to an electric wire marking method and apparatus for marking characters, symbols, and the like on the surface of a covered electric wire.

In a covered electric wire 1 in which the periphery of a conductor is covered with an insulating coating, generally, as shown in FIG. 7, a character string or the like serving as an identification mark of the electric wire on the outer peripheral surface of the coating at regular intervals in the length direction. 2 is printed.
The character string 2 is a combination of characters, symbols, figures, and the like, and the size L of the character to be printed is set according to the outer diameter D of the covered electric wire 1.

  Until now, as a marking method of the electric wire which prints the character string 2 etc. on the outer peripheral surface of the covered electric wire 1 in this way, an ink jet method which performs non-contact printing using an ink jet recording head (for example, Patent Document 1) A laser system that prints by irradiating the coated outer peripheral surface with laser light emitted from a laser marker (for example, see Patent Document 2), or a marking roller having a marking stamp portion provided on the outer peripheral surface. A marking roller type (for example, see Patent Document 3) that presses against the outer peripheral surface of a covered electric wire and transfers the ink in the stamp portion to the covered electric wire has been proposed.

FIG. 8 shows an example of an apparatus for printing a character string 2 or the like on the outer peripheral surface of the covered electric wire 1 by the marking roller method.
The device 4 includes a lower marking roller 5 that sandwiches the covered electric wire 1 conveyed in the longitudinal direction from above and below, and an upper pressing roller 7. On the surface of the marking roller 5, recesses 9 are intermittently arranged in the circumferential direction, and the lower half of the marking roller 5 is immersed in the ink 13 in the ink container 11. The holding roller 7 is held at a position in pressure contact with the surface of the electric wire 1 by a holding member (not shown). The electric wire 1 is pressed in the longitudinal direction while the electric wire 1 is pressed against the outer peripheral surface of the marking roller 5 by the holding roller 7. The rollers 5 and 7 are rotated in opposite directions in conjunction with the electric wire 1.

  According to this apparatus 4, the ink 13 in the ink storage container 11 is pumped up with the rotation of the marking roller 5, and the ink 13 attached to the surface other than the recess 9 in the marking roller 5 is scraped with the spatula 15. Only the ink 13 that has been dropped and entered the recess 9 is intermittently adhered to the surface of the electric wire 1 that is in pressure contact therewith. That is, a dotted line mark is attached to the surface of the electric wire 1.

JP 2004-342404 A JP 2001-135174 A JP-A-10-040749

By the way, in order to improve productivity, it is required to increase the traveling speed of the covered electric wire to be marked.
However, in conventional marking methods using an ink jet method or a laser method, generally, the traveling speed of the covered electric wire is limited to about 10 m / min, and further speed improvement may cause printing defects such as blurred characters or missing characters. was there.
In particular, in the case of an electric wire with a diameter smaller than the American Wire Gage (hereinafter referred to as AWG) standard No. 28, if the marking roller is displaced in the direction perpendicular to the traveling direction of the electric wire, the position of the character to be printed is deviated. Disturbances or missing characters resulted in defective products due to defective marking, causing a decrease in product yield.

  The purpose of the present invention is to improve the productivity by greatly improving the traveling speed of the electric wire, compared to the marking device by the conventional marking roller method, and to suppress the occurrence of marking defects, An object of the present invention is to provide an electric wire marking method and apparatus capable of improving the product yield.

In order to achieve the above object, according to the first aspect of the present invention, there is provided a marking method for an electric wire, wherein a marking roller is provided on a peripheral surface and is rotated, and a coated electric wire is pressed against the stamp portion. An electric wire which comprises a pressing roller, supplies ink to the stamp portion with the coated roller sandwiched between the marking roller and the pressing roller, rotates the marking roller, and continuously performs marking on the outer periphery of the covered electric wire The marking method of
A support shaft is integrally provided at the center of the pressing roller, and the support shaft is rotatably supported by a rolling bearing fitted therein, and an axial biasing force is applied to the rolling bearing in the housing portion of the rolling bearing. Equipped with a leaf spring to add,
And the site | part facing the corner | angular part of the said marking roller of the said pressing roller was chamfered, It is characterized by the above-mentioned.

According to a second aspect of the present invention, there is provided a marking device for an electric wire, comprising: a marking roller that is provided with a marking stamp portion on its outer peripheral surface and rotating; a pressing roller that presses the coated electric wire against the stamp portion; and the stamp portion. An electric wire marking device that comprises an ink supply means for supplying ink and rotates the marking roller to continuously mark the outer periphery of the covered electric wire,
A support shaft is integrally provided at the center of the pressing roller, and the support shaft is rotatably supported by a rolling bearing fitted to the supporting roller, and an axial urging force is applied to the rolling bearing in the accommodating portion of the rolling bearing. Equipped with a leaf spring to add
And the site | part facing the corner | angular part of the said marking roller of the said pressing roller was chamfered, It is characterized by the above-mentioned.

  In the electric wire marking method and apparatus according to the first and second aspects of the present invention, since the pressing roller regulates the traveling position of the covered electric wire, the electric wire itself can be prevented from shaking in the direction perpendicular to the traveling direction during traveling. As a result, even if the traveling speed of the electric wire is increased, it is possible to prevent the occurrence of marking defects due to blurring during the traveling of the electric wire itself and to improve the product yield.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an electric wire marking method and apparatus according to the invention will be described in detail with reference to the drawings.
FIG. 1 is a front view of an embodiment of a marking device for carrying out the electric wire marking method according to the present invention, FIG. 2 is a side view of the marking device shown in FIG. 1, and FIG. 3 is a schematic diagram of the marking device shown in FIG. FIG. 4 is an enlarged view of the main part shown in FIG. 3, FIG. 5 is an enlarged view of part B of FIG. 4, and FIG. 6 is an enlarged view showing a chamfering structure of the outer peripheral part of the pressing roller.

  As shown in FIGS. 1 and 2, the marking device 21 according to this embodiment includes a substantially disc-shaped marking roller 25 having a marking stamp portion projecting from an outer peripheral surface thereof and rotating integrally with a drive shaft 23. The substantially disc-shaped pressing roller 28 that presses the covered electric wire 26 against the stamp portion of the marking roller 25, the device frame 29 that supports the marking roller 25 and the pressing roller 28 in a predetermined positional relationship, and the device frame 29 And an ink supply means 31 for applying an appropriate amount of ink to the stamp portion of the marking roller 25 supported by the roller. The marking roller 25 is driven to rotate to transfer the ink in the stamp portion to the contact surface of the covered electric wire 26. Thus, the marking of the character string 2 (see FIG. 7) or the like is continuously performed on the outer periphery of the traveling electric wire 26.

As shown in FIG. 4, the drive shaft 23 integrated with the marking roller 25 is rotatably supported by a pair of rolling bearings 33 and 34 fitted at two positions separated in the axial direction, and a rotational drive (not shown). It is rotationally driven by the rotational force transmitted from the mechanism.
The pair of rolling bearings 33, 34 is supported by pressing the outer ring into a sleeve 36 fixed to the device frame 29.

  By selecting the length of the drive shaft 23 and the span S3 between the pair of rolling bearings 33 and 34 that support the drive shaft 23 to be larger than a certain size, the positioning accuracy of the axis of the drive shaft 23 is increased. As a result, blurring of the stamp portion during rotation of the marking roller 25 is suppressed.

The pressing roller 28 has a guide groove 28a into which the covered electric wire 26 is fitted in the center in the width direction of the outer peripheral surface, and the roller groove direction of the covered electric wire 26 (a direction orthogonal to the traveling direction of the electric wire) by the guide groove 28a. Restrict movement to
In the case of the present embodiment, a support shaft 41 is integrally provided at the center of the pressing roller 28 as in the case of the marking roller 25.

In the case of the present embodiment, as shown in FIG. 4, the pressing roller 28 is rotatably supported by a pair of rolling bearings 43 and 44 that fit into a support shaft 41 that is integrally provided at the center thereof.
As shown in FIG. 4, the pair of rolling bearings 43, 44 is supported by being press-fitted into a sleeve 46 connected to the apparatus frame 29 via a roller interval adjusting mechanism 45.

  As in the case of the drive shaft 23, the length of the support shaft 41 and the span S4 between the pair of rolling bearings 43 and 44 that support the support shaft 41 are selected to be larger than a certain size, thereby supporting the shaft 41. The positioning accuracy of the shaft core can be increased, thereby preventing the pressing roller 28 from blurring and enabling highly accurate positioning with no alignment.

  The roller interval adjusting mechanism 45 is fixed to the sleeve 46 and is configured to be able to advance and retreat the sleeve 46 toward the marking roller 25 (movable up and down in FIG. 4), and between the marking roller 25 and the pressing roller 28. The interval can be adjusted. The roller interval adjusting mechanism 45 is driven forward and backward by an air cylinder (not shown), and urges the sleeve 46 toward the marking roller 25 by the air pressure supplied to the air cylinder.

In the case of the present embodiment, as shown in FIG. 5, a part of the rolling bearings 34, 44 (see FIG. 5) is provided in the accommodating portions 36a, 46a for the rolling bearings 34, 44 formed on the rear end side of the sleeves 36, 46. A leaf spring 57 is provided which applies an urging force in the axial direction to the outer ring and restricts the axial movement of the rolling bearings 34 and 44.
The leaf spring 57 takes the axial play between the inner and outer rings of the rolling bearings 34 and 44 to improve the axial positioning accuracy to the limit. Thereby, the positional accuracy (axial direction) of the pressing roller 28 can be set to ± 0.05 mm.

  In the case of the present embodiment, as shown in FIG. 6, a chamfer 59 is applied to a portion of the pressing roller 28 that faces the corner 25 a that is the peripheral edge of the marking roller 25.

  As shown in FIGS. 1 and 2, the ink supply means 31 is rotated in conjunction with the rotation of the marking roller 25 and the ink tub 61 storing ink at a position below the marking roller 25. An ink scraping roller 62 for scraping ink and applying ink to the stamp portion of the marking roller 25, a motor 63 for driving the ink scraping roller 62 to rotate, and a stamp by bringing the tip into contact with the stamp portion of the marking roller 25 Ink application amount adjusting means 65 and 66 for scraping off excess ink applied to the part and adjusting the ink application amount in the stamp part to an appropriate value.

  In the marking device 21 described above, marking is continuously performed on the outer circumference of the traveling covered electric wire 26 by rotating the marking roller 25 and transferring the ink in the stamp portion onto the contact surface of the covered electric wire 26. In the pressing roller 28, the axial play of the rolling bearings 34 and 44 is restricted by the leaf spring 57, and the positional accuracy in the axial direction is enhanced to the limit.

In the marking method using the marking device 21, the pressing roller 28 that presses the covered electric wire 26 against the marking roller 25 regulates the traveling position of the covered electric wire 26 by the guide groove 28a, so that the traveling electric wire 26 itself is perpendicular to the traveling direction. Therefore, even if the traveling speed of the electric wire 26 is increased, it is possible to prevent the occurrence of marking defects due to the blurring during the traveling of the electric wire 26 and improve the product yield.
In addition, since the pressing roller 28 is rotatably supported by a pair of rolling bearings 43 and 44 fitted to the support shaft 41, a marking roller system in which a pair of rolling bearings is disposed inside a pressing roller described later as a comparative example ( Compared with the case of FIG. 9), the span S4 between the pair of rolling bearings 43 and 44 that support the pressing roller 28 can be set larger. Thereby, since the positioning accuracy of the shaft core of the pressing roller 28 is improved, even if the traveling speed of the electric wire 26 is further increased, the pressing roller 28 is less likely to be shaken.

Therefore, as compared with a marking roller type marking device in which a pair of rolling bearings are disposed inside the pressing roller, the traveling electric wire 26 is displaced in a direction perpendicular to the traveling direction due to the blurring of the axis of the pressing roller 28 during traveling. And the occurrence of marking defects due to the shaft core blur of the pressing roller 28 is suppressed, so that the traveling speed of the electric wire 26 can be further greatly improved and the productivity can be improved. Thus, it is possible to suppress the occurrence of marking defects and improve the product yield.
When the inventor of the present application tried to mark AWG No. 30 wires, even if the traveling speed of the wires was increased to about 400 m / min, no marking failure occurred, and the speed was significantly improved and the product yield increased. Improvement was confirmed.

  Furthermore, in the electric wire marking method and apparatus of the present embodiment, the pressing roller 28 is chamfered 59 at the portion facing the corner portion 25a of the marking roller 25, so that it sticks out of the corner portion 25a of the marking roller 25. It becomes difficult for the ink thus deposited to adhere to the facing surface of the pressing roller 28. Therefore, it is possible to suppress the occurrence of secondary damage such as contamination of the pressure roller 28 due to ink adhesion and contamination due to the soiled pressure roller 28, thereby improving the product yield.

FIG. 9 shows a marking device used as a comparative example.
In the marking device 74, a driving shaft 75 integrated with the marking roller 77 is rotatably supported by rolling bearings 71 and 72 fitted in two axially spaced locations, and a span S1 between the bearings 71 and 72 is supported. However, it is set to a certain size or more, and the positioning accuracy of the axis of the drive shaft 75 is increased.
On the other hand, the pressing roller 79 is provided with rolling bearings 84 and 85 at substantially both end portions of the shaft insertion hole 79 b penetrating the center portion, and these rolling bearings 84 and 85 are mounted in parallel with the drive shaft 75. By being fitted to the support shaft 76, it is rotatably supported.
In order to earn the span S2 between the pair of rolling bearings 84 and 85, the width dimension W2 of the pressing roller 79 is set larger than the width dimension W1 of the marking roller 77. 85 is not equipped with a leaf spring that restricts the axial movement of the bearing.

  When marking was performed using this marking device, according to the study by the inventors of the present application when the traveling speed of the electric wire was increased, for example, the AWG28 electric wire having a coating outer diameter D of 0.32 mm was used. In this case, it has been found that when the displacement in the width direction of the pressing roller 79 is 0.25 mm or more, a marking defect due to missing characters occurs. In the case of this marking device 74, if the displacement in the width direction of the pressing roller 79 is limited to 0.25 mm or less, the traveling speed of the electric wire is limited to about 40 m / min, and the speed can be further increased. I found out.

It is a front view of one embodiment of a marking device which carries out a marking method of an electric wire concerning the present invention. It is a side view of the marking apparatus shown in FIG. It is an enlarged view of the principal part of the marking apparatus shown in FIG. It is a longitudinal cross-sectional view of the principal part shown in FIG. It is an enlarged view of the B section of FIG. It is an enlarged view which shows the chamfering structure of the outer peripheral part of a pressing roller. It is explanatory drawing of marking to the covering outer peripheral surface of a covered electric wire. It is structure explanatory drawing of the marking device by the conventional marking roller system. It is a side view of the marking device used for comparison.

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Marking apparatus 23 Drive shaft 25 Marking roller 25a Corner | angular part 26 Covered electric wire 28 Pressing roller 31 Ink supply means 33, 34 Rolling bearing 36 Sleeve 36a receiving part 41 Supporting shaft 43,44 Rolling bearing 45 Roller space | interval adjustment mechanism 46 Sleeve 46a receiving part 57 leaf spring 59 chamfer 61 ink fountain 62 ink scraping roller 63 motor 65, 66 ink application amount adjusting means

Claims (2)

A marking roller provided with a marking stamp portion on an outer peripheral surface and rotating, and a pressing roller that presses the covered electric wire to the stamp portion, and the stamped wire is sandwiched between the marking roller and the pressing roller. An electric wire marking method in which ink is supplied to the part and the marking roller is rotated to continuously mark the outer periphery of the covered electric wire,
A support shaft is integrally provided at the center of the pressing roller, and the support shaft is rotatably supported by a rolling bearing fitted therein, and an axial biasing force is applied to the rolling bearing in the housing portion of the rolling bearing. Equipped with a leaf spring to add,
And the electric wire marking method characterized by chamfering the site | part facing the corner | angular part of the said marking roller of the said pressing roller. A marking roller that is provided with a marking stamp portion on its outer peripheral surface and rotates; a pressing roller that presses the coated electric wire against the stamp portion; and an ink supply means that supplies ink to the stamp portion. A wire marking device that rotates and continuously performs marking on the outer periphery of a covered wire,
A support shaft is integrally provided at the center of the pressing roller, and the support shaft is rotatably supported by a rolling bearing fitted to the supporting roller, and an axial urging force is applied to the rolling bearing in the accommodating portion of the rolling bearing. Equipped with a leaf spring to add
And the marking part of the electric wire characterized by chamfering the part which opposes the corner | angular part of the said marking roller of the said pressing roller.

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