JP2784940B2 - Marking method - Google Patents

Description

The present invention relates to a method for marking by letterpress printing.

[Prior Art] A conventional marking device is, as shown in FIG.
Is fixed to a swing lever 53 that is moved up and down by a cam 52 with a screw 54. Reference numeral 55 denotes a spring that biases the swing lever 53 so that the swing lever 53 follows the cam 52, and reference numeral 56 denotes a work that is positioned and mounted on the work mounting table 57 and printed.

As described above, since the plate base 51 is driven by the cam 52, the plate 50
Is constant. Therefore, when the thickness of the work 56 is different due to the type change, the screw 54 is loosened and the plate base 51 is removed.
Is moved up and down to adjust the distance 1 between the plate 50 and the work 56.

[Problems to be Solved by the Invention] In the above-described conventional technology, the adjustment of the distance l is performed once by stamping, and the height of the plate stand 51 itself needs to be adjusted by checking the stamping state (the degree of contact with the plate 50). Therefore, a large amount of adjustment time is required. Further, there is a problem that uniform stamping cannot be performed because the degree of contact of the plate 50 with the stamping surface varies depending on the operator.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a marking method and apparatus which can easily set a distance between a plate and a work at the start of descent and can perform uniform marking.

[Means for Solving the Problems] A marking method for achieving the above object comprises a detecting means for vertically moving a plate base on which a plate is mounted by a vertical drive motor, and detecting when the plate comes into contact with a workpiece. And printing is performed by rapidly lowering the platen to a position slightly lower than the position when the platen starts lowering and the position when the plate comes into contact with the workpiece, and then lowering the printing speed at a low speed.

[Operation] According to the above marking method, the plate is determined by the rotational position of the vertical drive motor before the plate is lowered and the rotational position of the vertical drive motor when a signal is issued from the detection means when the plate comes into contact with the work. The distance between the workpiece and the work surface can be calculated.
Therefore, even if the thickness of the work changes due to the type change,
The lowering amount of the plate stand can be easily set in a short time. Also, there is no variation in how the plate hits the work surface by the operator, and uniform marking can be performed.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. As shown in FIG. 1, a printing plate 2 to which a printing plate (rubber stamp) 1 is adhered is removably attached to a printing plate mounting body 4. A contact rod 6 made of a conductive material is fixed to the plate mount 4 via an insulator 7, and a terminal 8 is fixed to one end of the contact rod 6. The plate base mounting body 4 is provided on a first movable base 9 via a linear guide 10 so as to be vertically movable. A contact rod 11 made of a conductive material for supporting the lower surface of the contact rod 6 is fixed to a lower end of the first movable table 9, and a stopper 12 is screwed to an upper end of the first movable table 9 corresponding to the upper surface of the plate mount 4. Have been. Therefore, when the first moving table 9 moves up and down, the contact rod 1
The plate-mounting member 4 also moves together via 1 and 6. here,
When the contact rods 6 and 11 are in contact with each other, the stopper 12 is adjusted so as to have a gap of about 50 μm with respect to the plate mount 4. The contact rod 11 is connected to a ground line.

The first moving table 9 is slidably provided on a guide bar 16 disposed perpendicular to the second moving table 15, and is supported by the second moving table 15 so as to be rotatable in parallel with the guide bar 16. It is screwed to a vertical feed screw (hereinafter referred to as a Z-direction feed screw) 17. A Z-direction feed screw 17 is a vertical drive motor (hereinafter referred to as a Z-direction drive motor) 18 fixed to the second movable base 15.
Driven through the belt means 19. 2nd carriage
Reference numeral 15 denotes a Y bar slidably provided on a guide bar 21 disposed in the Y direction horizontal to the third carriage 20, and parallel to the guide bar 21 and rotatably supported by the third carriage 20. Directional feed screw
Screwed into 22. The Y-direction feed screw 22 is the third moving table 20
Is driven by a Y-direction drive motor 23 fixed to
The third moving table 20 is provided slidably in the X direction horizontal to the base 24, and an X direction driving motor 25 fixed to the base 24.
Driven through an X-direction feed screw (not shown).

Accordingly, when the Z-direction drive motor 18 is driven, the Z-direction feed screw 17 is rotated via the belt means 19, and the first moving table 9 is moved in the vertical direction. As a result, the plate base 2 is moved in the vertical direction together with the plate base mount 4. When the Y-direction drive motor 23 is driven, the Y-direction feed screw 22
The second moving table 15 is moved in the Y direction by the
Is also moved in the Y direction. Similarly, the X-direction drive motor
When the 25 is driven, the third moving table 20 is moved in the X direction, and the plate table 2 is also moved in the X direction.

An ink table 33 containing ink 32 is provided at a position in the Y direction away from the work table 31 on which the work 30 to be printed is positioned and mounted.

Therefore, printing is performed by vertically moving the plate 2 by the Z-direction drive motor 18 and moving the plate 2 by the X-direction drive motor 25.
In combination with the directional movement, the operation indicated by the arrow for printing the work 30 after applying the ink 32 to the plate 1 is repeated.

A signal 6a of the contact rod 6 emitted when the contact rod 11 is separated from the contact rod 6 is input to the main control circuit 41 via the relay circuit 40, as shown in FIG. The main control circuit 41 controls the various motors 5, 18, 23, and 25 and controls the feed of the work 30. When a signal 6a from the contact rod 6 is input, a vertical motor drive circuit (hereinafter referred to as Z) is provided. Motor drive circuit) 42
And outputs a signal for controlling the Z-direction drive motor 18 via the.

First, prior to the actual printing operation, then the plate 1 and the work 30
A method for setting the distance 1 to the distance will be described.

With the plate 1 positioned above the work 30, the Z-direction drive motor 18 is driven to lower the plate base 2. The position of the plate 1 before the descent start is stored in the main control circuit 41 in advance. The position of the printing plate 1 can be easily determined by using the Z-direction drive motor 18 with an encoder. The operator lowers the plate stand 2 by manually operating a well-known electric chessman (not shown) to drive the Z-direction drive motor 18 by one.
This is performed by driving each pulse. Then, when the plate 1 comes into contact with the work 30 and the first movable table 9 further descends, the plate 1 is attached to the plate base mounting body 4 and the members 1 to 5 mounted on the plate base mounting body 4.
The contact bar 6 follows the descent of the contact bar 11 and descends while maintaining contact until the plate 1 is crushed by its own weight of 3, 5 to 8.

After that, the plate mount 4 does not descend, only the first movable table 9 descends, the contact rod 11 is separated from the contact rod 6, and an off signal 6a is output from the contact rod 6. The crushing amount of the plate 1 varies depending on the material of the plate 1, but is about 50 μm. Therefore, taking this amount into consideration, a position 50 μm above the detection point is set as the Z level (distance to the surface of the work 30). . Thereby, the distance 1 between the plate 1 and the work 30 is known.

Therefore, in actual use, about 20
The main control circuit 41 is stored in such a manner that the plate base 2 is rapidly lowered as a search level above 0 μm (about 150 μm from the Z level), and thereafter lowered at a slow speed. In this way, the descent time can be reduced. Further, the amount (pressing amount) of lowering the plate 2 with reference to the output of the signal 6a is set in the main control circuit 41 in advance.

Next, the printing operation will be described. When the start button is pressed, the plate 2 rapidly descends from above the work 30 to the above-described search level (about 150 μm above the work 30), and thereafter descends at a slow speed. Then, until the plate 1 comes into contact with the work 30 and the plate 1 is further crushed by the weight of the members 1 to 8, the contact bar 6 follows the descent of the contact bar 11 and keeps contact and descends.

After that, the plate mount 4 does not descend, only the first movable table 9 descends, the contact rod 11 is separated from the contact rod 6, and an off signal 6a is output from the contact rod 6. In response to this detection signal, the main control circuit 41 outputs a signal for lowering the plate 1 by the previously stored pressing amount. As a result, first, when the first movable table 9 is lowered by the gap between the stopper 12 and the plate base mounting body 4, the stopper 12 comes into contact with the plate base mounting body 4. Accordingly, when the first movable table 9 is further lowered from this position, the plate base mounting body 4 is pressed by the stopper 12, and the plate 1 is pressed against the work 30 to perform the stamping.

As described above, the Z-direction drive motor 18 is driven by a fixed amount from the main control circuit 41 via the Z motor control circuit 42 by the signal 6a, so that even if the thickness of the work 30 varies, Is constant, so that uniform printing can be obtained.

FIG. 3 shows another embodiment of the present invention. In the above embodiment, the contact point was detected by turning on and off the contact rods 6 and 11,
In this embodiment, the contact rods 6 and 11 are merely support rods.
A non-contact type sensor 26 is fixed to the first movable base 9 while keeping a certain gap from the contact rod 6. That is, the contact point can be detected by a change in the distance between the sensor 26 and the contact bar 6. The sensor 26 may not correspond to the contact rod 6 but may correspond to an arbitrary position of the plate mount 4.

〔The invention's effect〕

As is clear from the above description, according to the present invention, the distance between the plate and the work surface can be calculated, so that even when the thickness of the work changes due to the type change, the descending amount of the plate stand can be easily set in a short time. it can. Also, there is no variation in how the plate hits the work surface by the operator, and uniform marking can be performed.

Further, since the plate can be rapidly lowered to a position slightly above the position where the plate comes into contact with the work, productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG.
FIG. 3 is a front view of a main part showing another embodiment of the present invention, and FIG. 4 is a schematic explanatory view of a conventional example. 1: Plate, 2: Plate base, 6: Contact rod, 6a: Signal, 9: 1st slide, 10: Linear guide, 11: Contact rod, 12: Stopper, 17: Z direction feed screw, 18: Z direction Drive motor, 26: sensor, 30: work, 42: Z motor control circuit.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B41K 3/00 B41K 3/04

Claims (1)

(57) [Claims] And a detecting means for detecting when the plate comes into contact with the work by moving the plate base on which the plate is mounted up and down by a vertical drive motor. A marking method characterized by rapidly lowering to a position slightly above the position at the time of contact, and then lowering the printing speed at a low speed to perform printing.