JPH0314359Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a marking device for workpieces such as electronic components, and more specifically, it marks the outer peripheral surface of a leadless shaft-shaped workpiece by color-coding polarity, lot number, etc. Regarding a stamping device.

BACKGROUND OF THE INVENTION Axial workpieces, such as diodes, are generally of the axial type with lead wires led out in the opposite direction at 180 degrees from the component body, and the leadless type (chip type) with no lead wires. An example of an axial diode is shown in Fig. 10, where 1 is a cylindrical component body, 2, 2 are two lead wires led out in the axial direction from the component body 1, and 3, 3'... are the component body 1. Multiple color codes stamped circumferentially on the outer periphery of the rod indicate polarity, lot number, etc.

The marking of color codes 3, 3'... on the diode 4 supports the lead wires 2, 2,
While rotating the component body 1 around its central axis via the lead wires 2, 2, a transfer roller (not shown) is brought into contact with the outer periphery of the component body 1, and the ink on the transfer roller is transferred to the component body 1. This is done by transferring it to. Specific examples of this stamping device are shown in Figures 11 to 1.
This will be explained with reference to FIG.

Figure 11 is a plan view, Figure 12 is a front view, Figure 13 is a
The figure is a cross-sectional view taken along the line H--H in Figure 12. In the figure, 5 and 5 are a pair of chain conveyors that hold the diode 4 horizontally and convey it in orthogonal directions.
The diode 4 is held by inserting the lead wires 2, 2 of the diode 4 into a pair of bifurcated claws 6, 6, . . . projecting from each chain conveyor 5, 5. Reference numerals 7 and 7 designate a pair of centering guide plates arranged at the stamping position between the chain conveyors 5 and 5, which abut against both ends of the component body 1 of the diode 4 that has been conveyed to the stamping position by the chain conveyors 5 and 5. , performs positioning of the component body 1. 8,8
is a push-up plate disposed outside the centering guide plates 7, 7, on which the lead wires 2, 2 of the diode 4 ride. 9, 9 are rotating rollers that press against the lead wires 2, 2 on the push-up plates 8, 8 to apply rotational force; 10 is the outer periphery of the component body 1 of the diode 4 rotated by the rotating rollers 9, 9; This is a transfer roller that is pressed from above to stamp. The transfer roller 10 has, as shown by the chain line in FIG.
A printing plate roller 11 and an ink supply roller 12 are arranged in this order. When one diode 4 supported by a pair of claws 6, 6 of chain conveyors 5, 5 is transported near the stamping position, the axial deviation of the component body 1 is corrected by centering guide plates 7, 7. Then, the lead wires 2, 2 are moved onto the push-up plates 8, 8. At this time, the lead wires 2, 2 remain in the claws 6, 6 of the chain conveyors 5, 5. and,
When the diode 4 comes to the stamping position directly below the transfer roller 10, it is rotated by the rotating rollers 9, and the transfer roller 1 is placed at a desired position on the outer periphery of the component body 1.
0 is correct and one color code 3 is stamped.

When stamping a plurality of color codes 3, 3', .

Problems that the invention aims to solve By the way, with the recent trend toward downsizing and printed wiring in electrical equipment, there is an increasing demand for leadless diodes. The development of a stamping device suitable for stamping has been delayed. That is, the leadless diode is, for example, as shown in FIG. 14, in which a diode pellet 14 is sandwiched between a pair of electrodes 13, 13, and a glass sleeve 15 is welded around the electrodes 13, 13. Such a leadless diode [hereinafter referred to as work] 16
In this case, desired color codes 17, 17', . . . are stamped on the outer periphery of the glass sleeve 15.
An effective way to imprint the mark on the workpiece 16 is to rotate the workpiece 16 around its central axis and bring a transfer roller into contact with the outer peripheral surface of the workpiece 16. This is difficult because there is no lead wire and the workpiece 16 is small, several millimeters or less, and at present no marking device has been developed that can reliably mark the workpiece 16 with good mass production.

Means for Solving the Problems The present invention has been made in view of the above-mentioned current situation, and is a device for circumferentially marking the outer peripheral surface of a leadless shaft-shaped work. A rotating drum having a plurality of recesses arranged at predetermined intervals to house the recesses with the direction orthogonal to the circumferential direction of the outer circumferential surface, and a rotating drum rotating about a central axis parallel to the axial direction of the rotating drum at a fixed position near the outer circumferential surface of the rotating drum. To provide a stamping device, which is equipped with a transfer roller arranged such that it can be moved, and a magnetic field generating means that holds a workpiece in the recessed part of a rotary drum in the air by magnetic attraction force and presses it against the outer periphery of the transfer roller.

Operation The workpiece, which is magnetically held in the hollow space of the rotary drum, comes into contact with the transfer roller and is rotated by the rotational force of the transfer roller, so that the ink on the outer circumference of the transfer roller is transferred to the outer circumferential surface of the workpiece. Desired marking is performed, and thereby a marking device suitable for marking a color code or the like on the outer periphery of a workpiece is realized even if the workpiece is a small leadless shaft-shaped component.

Example Hereinafter, the workpiece 16 of the present invention, for example, shown in FIG.
An embodiment applied to a device for stamping color codes 17, 17', . . . on paper will be described with reference to FIGS. 1 to 9. Note that FIGS. 1 to 6 show the first embodiment, and FIGS. 7 to 9 show the second embodiment.

In the first embodiment shown in FIGS. 1 to 6, 1
8 is a rotating drum arranged vertically; 19 is a rotating shaft for rotating the rotating drum 18, for example, continuously rotating it;
20, 20... are recesses formed at a plurality of locations at equal intervals on the outer periphery of the rotating drum 18, 21a, 21b... are transfer rollers arranged at a plurality of stamping positions Pa, Pb... along the outer periphery of the rotating drum 18, 22 is a work supply section installed above the rotating drum 18;
Reference numeral 23 denotes a workpiece take-out section installed at the bottom of the rotating drum 18.

The recess 20 of the rotating drum 18 is shown in FIGS. 2 and 3.
As shown in the figure, the shape is such that one workpiece 16 is housed with its axial direction parallel to the axial direction of the rotating drum 18, and the workpiece 16 is housed within this recess 20 with a pair of magnets 24, 24 serving as magnetic field generating means. It is maintained at A pair of magnets 24, 24 are embedded in opposing inner wall surfaces of the recess 20 in the axial direction of the rotating drum, with different magnetic poles facing each other. Therefore, the work 16 supplied into the recess 20 is held in the hollow inside the recess 20 by having the electrodes 13, 13 at both ends thereof magnetically attracted by the pair of magnets 24, 24. The workpiece 16 is held such that a part of the outer circumference of the workpiece 16 protrudes slightly from the outer circumference of the rotating drum 18. An escape groove 25 is formed in the center of the bottom surface of the recess 20.
faces the glass sleeve 15 of the workpiece 16 housed in the recess 20 and prevents the ink stamped on the outer periphery of the glass sleeve 15 from touching the bottom of the recess 20.

The work supply unit 22 feeds the work 16 from a fixed position P ₁ on the upper part of the rotating drum 18 to the recess 20 .
For example, fixed position P ₁
It has a chute 26 that extends diagonally upward from the chute 26, and a stopper 27 that is disposed near the tip of the chute 26. The chute 26 is shaped like a rectangular gutter, on which a plurality of works 16, 16... rotate in series and descend. It rests on the outer circumference of the rotating drum 18 from the opening, and the rotating drum 18
rotates and one recess 20 comes to a fixed position _P1 in front of the stopper 27, and the most advanced workpiece 16 falls into this recess 20.

a fixed position P ₁ of the upper part of the rotating drum 18;
Stamping positions Pa, Pb, . . . are arranged between the lower workpiece takeout position _P2 where the workpiece takeout portion 23 is located. The transfer rollers 21a, 21b... at each of the printing positions Pa, Pb...
is arranged parallel to the axial direction of the An ink roller 28 is provided on the outer periphery of each transfer roller 21a, 21b...
Ink is transferred from a, 28b, . . . via printing plate rollers 29a, 29b, . Each transfer roller 21
a, 21b... are arranged at different positions facing the glass sleeve 15 of the work 16 housed in the recess 20 of the rotating drum 18, and the transfer rollers 21a, 2
1b... and the rotating drum 18 is the distance L ₁ between the recess 2
The projection length L _{2 of the work 16 housed in the recess 20 is set to be smaller than the length L 2} of the workpiece 16 that is housed in the recess 20 .

The workpiece take-out section 23 takes out the workpiece 16 stamped in the manner described later from the rotating drum 18, and for example, a magnetic box is used to take out the workpiece 16 without contact. To explain this with reference to FIGS. 5 and 6, 30 and 30 are the rotating drums 1
Two parallel non-magnetic guide plates fixed vertically on both sides of the lower part of 8, 31, 31 are guide plates 30,
30 is a pair of magnet plates placed outside the magnet plate. The magnet plates 31, 31 are magnetized in the thickness direction,
They are arranged in a V-shape with different magnetic pole faces facing each other to form a parallel magnetic field in the space m between the guide plates 30, 30. This magnetic box 23 has a magnetic plate 3
The wide side end between 1 and 31 is arranged at the lower part of the rotating drum 18, and the magnetic field strength in the space m is 1 in the recess 20.
The magnetic field strength is set to be larger than the magnetic field strength formed by the pair of magnets 24, 24. Therefore, as the rotating drum 18 rotates, one concave portion 20 closes to the magnetic box 23.
When approaching the space m, the workpiece 1 in this recess 20
6 is magnetically attracted to the space m, and the work 16 is cut out from the recess 20. The workpiece 16 cut into the space m is held in a hollow space within the space m with its axial direction parallel to the magnetic field direction of the space m, while the magnetic field strength of the space m is equal to the narrow side end of the magnet plates 31, 31. Therefore, the workpiece 16 cut out in the space m is held hollow by the magnet plate 3.
1 and 31, and is taken out to the outside.

Next, the workpiece stamping operation by the above-mentioned stamping device will be explained.

Rotating drum 18 and each transfer roller 21a, 21b
... is continuously rotated, and the workpieces 16 are fed one by one into the recess 20 from a fixed position _P1 . When one recess 20 is sent to the first stamping position Pa, a predetermined location on the outer periphery of the work 16 stored in the recess 20 hits the transfer roller 21a, and the work 16 is
It is pushed into the recess 20 by the transfer roller 21a by a difference of L ₂ −L ₁ . At this time, the work 16 remains pressed against the transfer roller 21a due to the magnetic force of the magnets 24, 24 holding the work 16.
The ink on the outer periphery of the transfer roller 21a is transferred to the outer periphery of the transfer roller 21a, and the desired color code 17 is stamped on the outer periphery of the transfer roller 21a.

Such a stamp is applied to each subsequent stamp position Pb,
A plurality of color codes 17, 17', . . . are stamped at different positions on the outer periphery of the workpiece 16 in sequence at Pc.... The workpiece 16 that has been stamped moves from the fixed position _P2 to the space m of the magnetic box 23.
They are cut out one after another and taken out to the outside. Therefore, the workpieces 16 can be stamped continuously with good mass productivity, and the workpieces 16 can be stamped continuously from supply to removal.
Because it remains held hollow even by magnetic force,
The ink stamped on the outer periphery of the workpiece 16 is not transferred to the rotating drum 18 or the like, resulting in poor marking, and accurate marking can be performed. In addition, the rotating drum 18
It is desirable to dry the ink stamped on the workpiece 16 by blowing air between the final stamping position and the take-out position _P2 or into the space m of the magnetic box 23.

Next, the second embodiment shown in FIGS. 7 to 9 will be explained. In the same figure, 34 is a rotating drum;
5, 35... are recesses formed at multiple locations at equal intervals on the outer peripheral surface of the rotating drum 34, and 36 is the rotating drum 3.
The rotary drum 34 and the transfer roller 36 are arranged in a stamping position near the outer periphery of the transfer roller 36, and the axial directions of the rotary drum 34 and the transfer roller 36 are parallel to each other.
6 is housed with its axial direction parallel to the axial direction of the rotating drum 34. The feature of the second embodiment is that a pair of arc-shaped presser plates 37, 37 are fixedly arranged in a predetermined section near the outer periphery of the rotating drum 34, and the workpiece 16 is placed on the outside of the presser plates 37, 37. A pair of arcuate magnet plates 38, 38 of the magnetic field generating means are fixedly arranged to be floated and held from the recess 35 by magnetic attraction.

The pair of presser plates 37, 37 are located at positions facing the electrodes 13, 13 of the workpiece 16 in the recess 35, and the distance between the presser plates 37, 37 and the rotating drum 34 is equal to the distance between the rotating drum 34 and the transfer roller 36. is set slightly larger than A pair of magnet plates 38, 38 are magnetized in the plate thickness direction, and are arranged with different magnetic pole faces facing each other, so that the rotating drum 34 with the presser plates 37, 37
A parallel magnetic field is formed in the space n ₂ near the outer periphery of. Non-magnetic guide plates 39, 39, . . . are fixed near the inner side of each magnet plate 38, 38.

The rotating drum 34 is arranged vertically and continuously rotates, and when one recess 35 moves to the upper position of the rotating drum 34, one workpiece 1 is placed in this recess 35.
6 is supplied. The magnetic field space n ₂ in which the presser plates 37 and 37 are located extends from the position where the recess 35 is slightly inclined, and the workpiece 16 is stamped as follows. When the recess 35 reaches the space _n2 , the workpiece 16 in the recess 35 is magnetically attracted to the space _n2 and hits the holding plates 37, 37, as shown in FIG. 8, and is held in the air. This work 16 is mounted on a rotating drum 34.
is pressed by the concave portion 35 by the rotation of the press plate 37,3.
When the workpiece 16 moves along the lower surface of the presser plate 3 and reaches the stamping position where the transfer roller 36 is located, the workpiece 16 is pushed by the transfer roller 36 and pressed against the presser plate 3, as shown in FIG.
7, 37, and move the transfer roller 36 as it is.
The color code 17 is stamped on the outer periphery of the workpiece 16. Furthermore, the rotating drum 34
When the workpiece 16 rotates, it separates from the transfer roller 36 and moves along the presser plates 37, 37 to the next stamping position.

In this second embodiment, the rotating drum 34
A magnet for holding the work 16 may be embedded in the inner wall surface of the recess 35 as in the first embodiment.

The present invention is not limited to a leadless marking device for diodes, but can also be applied to leadless devices such as resistors and capacitors. Moreover, the rotating drum may rotate intermittently.

Effects of the invention According to the invention, the workpiece is held in the air by magnetic force, contacts the transfer roller, and rotates as a result of imprinting. Stamping becomes easy, and this marking can be performed continuously by continuously rotating the rotary drum, thereby providing a workpiece stamping device with good mass productivity.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a first embodiment of a stamping device according to the present invention, FIG. 2 is a partially enlarged view including a partial cross section of FIG. 1, and FIGS. 3 and 4 are views of FIG. 1. A of
- An enlarged cross-sectional view taken along lines A and B-B, Figure 5 is an enlarged cross-sectional view taken along line C-C in Figure 1, and Figure 6 is a partial plan view taken along line D-D in Figure 1. be. FIG. 7 is a partial front view showing the second embodiment of the present invention;
The figure and FIG. 9 are cross-sectional views taken along the line E-E and line G-G in FIG. 7. Figure 10 is a side view of the diode, Figures 11 and 12 are a partial plan view and front view of the marking device of the diode in Figure 10, and Figure 13 is a sectional view taken along the line H-H in Figure 12. be. 1st
FIG. 4 is a side view including a partial cross section of a leadless shaft-like workpiece. 16... Workpiece, 18... Rotating drum, 20...
...Concavity, 21a, 21b...Transfer roller, 24...
...Magnetic field generating means, 34...Rotating drum, 35...
Recessed portion, 36...transfer roller, 38...magnetic field generating means.

Claims (1)

[Claims for Utility Model Registration] A device for circumferentially stamping the outer peripheral surface of a leadless shaft-shaped work, wherein the work is stored on the outer peripheral surface with the axial direction of the work perpendicular to the circumferential direction of the outer peripheral surface. a rotating drum having a plurality of recesses at predetermined intervals; a transfer roller rotatably disposed at a predetermined position near the outer peripheral surface of the rotating drum about a central axis parallel to the axial direction of the rotating drum; A stamping device comprising magnetic field generating means for holding a workpiece in the recess in a hollow state by magnetic attraction and pressing the workpiece against the outer periphery of the transfer roller.