JPS633953A - Multicolor printer for synthetic resin film - Google Patents

Abstract

PURPOSE:To automatically correct color shift, by mounting a control apparatus for changing the passing time of a film to a specific mark detector when positive and negative time shifts are generated in a specific mark detector signal with respect to the pulse counting of a pulse generator. CONSTITUTION:The position of an idler roller 4b is moved by manual operation while a film 15 is allowed to run to perform adjustment so that the color matching of first and second colors is achieved. At this time, the number of pulses corresponding to the offset angle of the reference point M of a second printing roller 2b are displayed on a panel. When the number of pulses are preliminarily inputted to a control apparatus 21, an adjusting apparatus 17 is operated by the signal C of the control apparatus 21 when difference is generated in the corresponding relation between the first color detection signal B of a specific mark detector 16 and the pulse counting of a pulse generator 14 and compensation rolls 8c, 8d are displaced to move the film so as to allow two colors to coincide. Therefore, even when a special reference line is not printed on the film, color shift is detected and can be corrected quickly and automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multicolor printing device used when printing two or more colors on a synthetic resin film.

[Prior Art] When printing two or more colors on a film, printing is performed for each color, but it is inconvenient if wrinkles appear between the hue tiles.

On the other hand, synthetic resin films stretch discontinuously even during printing, which often causes color shift.

In addition, special reference lines were drawn to align the positions.

When a color shift occurs, it is corrected by visual measurement.

[Problems to be Solved by the Invention] This invention does not require drawing a special reference line, and even when a slight color shift occurs, it is detected and automatically corrected as soon as possible. It is.

[Means for solving problems] This will be explained with reference to the drawings.

The multicolor printing device for synthetic resin film according to this invention includes:
The two printing rollers 2a and 2b arranged in parallel with each other and the rotating shaft 22 of the pulse generator 14 are configured to rotate in conjunction with each other at the same angular velocity, and between the first printing roller 2a and the second printing roller 2b. Film length adjustment device 1 between the two
7 and a first color specific mark detector 16 between the film length adjusting device 17 and the second printing roller 2b.
The signal B of the specific mark detector 16 and the pulse generator 14 are provided.
When a positive or negative time difference occurs in the signal B of the specific mark detector 6 with respect to the pulse count A of the pulse generator 14, the two are compared and the pulse count A of the pulse generator 14 corresponds to the signal B of the specific mark detector 16 a control device 21 that outputs a positive and negative adjustment signal C for the purpose of the adjustment; and a specific mark detector 16 that is displaced in response to the adjustment signal C.
Adjustment device 17 that changes the timing of passage of the film 15 against
It consists of.

[Example] This will be explained with reference to the drawings.

la and lb are first and second ink containers, 2a;

2b is the first and second printing roller, 3a and 3b are the first
and a second extrusion roller, 4a, 4b are first and second idle rollers, 5a, 5b are first and second drive pulleys, 9a, 9b are drive pulleys 5a, 5b
5a and 5b are the first and second driven pulleys, 7a and 7b are the first and second timing healds, 10 is the main shaft, and 23.24 is fitted to the main shaft 10. A fixed drive bevel gear, 11 is a drive pulley, 12 is a driven pulley, 13 is a timing belt, and 14 is a pulse generator.

Then, for each rotation of the second printing roller 2b, the pulse generator 14 also rotates once, and P pulse generators (for example, 10
00) pulses are generated. In addition,
The number of pulses generated from the reference point is usually called the pulse force count.

15 is a synthetic resin film.

Compensation rolls 8c and 8d are arranged at appropriate intervals so as to sandwich the film 15, and both ends thereof are supported by a lever 18, and the lever 18 is rotatably supported by a support shaft 19. 20 is a rod connected to the lever 18, and 17 is an adjustment device for moving the rod 20.

The rod 20 is moved by the signal C sent from the control device 21, and the positions of the compensator rolls 8c and 8d are moved as shown in FIGS. 4 and 5, and the length of the film 15 between the two printing rollers 2a and 2b is adjusted. It is supposed to be done.

Reference numeral 16 denotes a specific mark detector at the starting end of the first color, which has a function of reading a specific pattern, character, or symbol (same as the banknote figure reading function in a banknote exchanger);
It is installed at a fixed film length L from a reference point M of the printing roller 2b (located at a fixed position independent of the rotation of the roller).

1 action] Explain how to use it.

Set the compensator rolls 3c and 3d to the neutral position shown in FIG.

While running the film 15, the position of the idle roller 4b is moved manually, and the color matching of the first color and the second color are manually adjusted.

The number of pulses corresponding to the offset angle of the second printing roller 2b with respect to the reference point M at this time is displayed on the panel. When the number of pulses is input to the control device 21, if there is a difference in the correspondence between the signal B detected by the specific mark detector 16 and the pulse count of the pulse generator 14, the control device 21 The adjustment device 17 is actuated by the signal C, and the compensator rolls 3c and 13d are displaced.
Move the film 15 so that the two colors match.

[Effects of the Invention] According to the present invention, it is possible to accurately match two or more colors without printing a special reference line on the film, and moreover, during operation,
Misalignment of the pattern due to expansion and contraction of the film can also be automatically corrected.

[Brief explanation of drawings]

Figure 1 is the front principle diagram, Figure 2 is the principle diagram of the pulse generator,
FIG. 3 is a side view of the vicinity of the compensator roll, FIG. 4 is a front view of the compensator roll in a neutral position, and FIG. 59 is a front view of the compensator roll in a state where the film is stretched. la, lb Ink containers 2a, 2b Print rollers 3a, 3b Press rollers 4a, 4b Idle rollers 5a, 5b Drive pulleys 6a, 6b Driven pulleys 7a, 7b Timing healds 8c, 8d Compensation rolls 9a, 9b Passive bevel gears 10 Main shaft 11 Drive pulley 12 Driven pulley 13 Timing belt 14 Pulse generator 15 Synthetic resin film 16 Specific mark detector 17 Adjustment device 18 Lever 19 Support shaft 20 Rod 21 Control device 22 Rotating shaft 23.24 Drive bevel gear A Pulse generation signal B Specification Signal C of the mark detector Signal P transmitted from the control device to the adjustment device Number of pulses generated when the pulse generator makes one revolution L Length M between the second printing roller and the specific mark detector Reference point of the second printing roller Time Applicant Agent: Sangyo Kiden Co., Ltd.
Patent Attorney Furu 1) Kei Tsuyoshi Figure 2\. \te′ 〃8c. ) p7・′ d19 − , ,,.

Claims (1)

[Claims] Two printing rollers (2a, 2b
) and the rotating shaft (22) of the pulse generator (14) are configured to rotate in conjunction with each other at equal angular velocity, and the first printing roller (
A film length adjustment device (17) is provided between the film length adjustment device (17) and the second printing roller (2b), and a film length adjustment device (17) is provided between the film length adjustment device (17) and the second printing roller (2b). A specific mark detector (16) of one color is provided, and the signal (B) of the specific mark detector (16) and the pulse count (A) of the pulse generator (14) are When a positive or negative time difference occurs in the signal (B), the two are compared and the signal (B) of the specific mark detector (16) is added to the pulse count (A) of the pulse generator (14).
), a control device (21) that outputs a positive/negative adjustment signal (C) to correspond to the above adjustment signal (C); and an adjustment device that is displaced in response to the adjustment signal (C) and changes the timing of film passage to the specific mark detector (16). (
17) A multicolor printing device for synthetic resin film, characterized by comprising: