JPS6141567A - Printing apparatus - Google Patents

Abstract

PURPOSE:To obtain a printing apparatus made easy to mount printing paper and having good operability, by providing a detection mechanism and automatically locating a paper feed unit to the position corresponding to the width of the printing paper. CONSTITUTION:When printing paper 1 is inserted in a guide 9 from the rear of a printing apparatus, paper guides 16a, 16b detect the width of the printing paper 1 to send signals to paper feed units 2a, 2b through a control part and, at the same time, the paper feed units 2a, 2b moves to the position coinciding with the set width of printing paper 1. The printing paper 1 passes between a platen 3 and a printing head 4 as well as the platen 3 and the guide 9 by feed rollers 20, 21 to be sent to the paper feed units 2a, 2b by a length capable of training said paper 1 over a platen wheel. The feed amount of the printing paper 1 is determined by a microswitch 17. An operator completes the setting of the printing paper 1 to the apparatus only by training the printing paper 1 over the feed pins of the feed units 2a, 2b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing device, and particularly to a printing device in which printing paper can be easily attached.

[Explanation of conventional collision]

Examples of conventional printing devices include those shown in FIGS. 1 to 4, for example. Figure 1 is a schematic diagram of the printing device, Figure 2 is a schematic diagram of the printing device;
The figure shows a schematic side view showing the printing paper route of FIG. 1. The printing paper 1 with the sprocket wheel 1a is conveyed from the rear of the apparatus (as shown in Fig. 2), passes between the platen 3 and the guide 9 in the direction of the arrow, and then passes between the platen 3 and the print head 4. Units) 2a and 2b are set and sent out to the rear of the device again. paper transport unit) 2a, 2
b has a feed pin 22 that matches the sprocket wheel la of the printing paper 1, which moves the printing paper 1 by a predetermined amount. As shown in FIG. 1, the paper conveying units 2a and 2b are composed of a left and a right pair, and are driven by a motor 6 as a drive source.
The controlled rotation of the timing belt 7 and platen 3
, via the gear train 8, drive the paper transport 2a, 2b)
10 to drive the feed pin 22. This type of printing device also includes an ink ribbon 5 and the like.

Next, a schematic diagram of the paper transport units 2a and 2b is shown in FIG. Paper transport unit) 2a, 2b are drive shafts 10,
It is held by a driven shaft 11 and can be moved left and right by opening and closing a lock lever 12. FIG. 4 shows the situation when the printing paper 1 is set in the paper transport units 2a and 2b. In this type of configuration, the operator manually transfers the paper transport unit (2a) for printing paper 1 of various paper widths.
.

2b, and even when replacing the main printing paper 1, the printing width is manually finely adjusted. However, this work is complicated, and operators have been requesting improvements in the operability of the printing paper 1.

[Problems to be solved]

The present invention solves the complexity and poor operability of the conventional work of manually positioning the paper transport unit and fine-tuning the printing width when loading or replacing printing paper, and automatically performs the adjustment. It makes it possible to do so.

[Means for solving problems]

The printing device of the present invention includes a detection mechanism that detects a printing width and a signal from the detection mechanism in a printing device that has a pair of paper conveyance units that convey the printing paper using a sprocket wheel of the printing paper. The above-mentioned conventional problems are solved by providing a drive mechanism that automatically positions the paper conveying unit to a position corresponding to the receiving printing width.

(Embodiment) Next, an embodiment of the present invention will be described with reference to Figs. 5 to 9. Fig. 5 shows a paper transport unit of a printing device, and Fig. 6 shows the paper transport unit. The left and right paper transport units 2a and 2b are fixed with motors 13a and 13b equipped with drive gears, and a driven shaft 11 with gears cut on the circumference.
They are interlocked. The driven shirt 11 is fixed to plates on both sides (not shown). A sensor 15a for positioning is provided in the main paper transport units 2a and 2b.
115b is fixed and assembled on the scale 14 provided near the paper transport units) 2a and 2b.
The structure is such that each position is determined by the slit.

Next, FIG. 7 shows an embodiment of a detection mechanism for detecting a narrow width for printing. Paper guide 16 corresponds to printing paper 1
a, 16b are provided. Paper guide 16a
, 16b has an optical sensor inside to detect the edge of printing paper. FIG. 8 shows paper guides 16a and 16b.
An example of automatic position detection is shown. It has a functional structure similar to that of the paper transport units 2a and 2b described above, and is composed of a motor 18 that allows movement from side to side and a position detection mechanism 19. (Paper transport unit) 2a, 2b
By combining the paper guides 16a and 16b, the following drive mechanism becomes possible. This will be explained with reference to FIG.

When the printing paper 1 is inserted onto the guide 9 from the rear of the printing device, the paper guides 16a and 16b detect the paper width of the printing paper 1 and send a signal to the paper transport units 2a and 2b through a control section (not shown). At the same time, the paper transport units 2a and 2b move to positions that match the set printing width. The printing paper 1 is fed by the feed rollers 20, 21 between the guide 9, the platen 3, and the print head 4 by a length that can be applied to the sprocket wheels of the paper transport units 2a, 2b. The feed amount of the printing paper 1 at this time is determined by the microswitch 17.

The operator can feed the printing paper 1 onto the feed pins 22 of the paper transport units 2a and 2b without worrying about the tension of the printing paper 1 by moving the paper transport units 2a and 2b left and right.
Setting the printing paper in the device is completed just by pressing the button.

This mechanism is particularly effective for users who frequently use printing paper l of various types, particularly of different widths, as it can improve operability.

Father, in the above, I left the job of setting the sprocket wheel Ia of printing paper 1 to the conveyance unit to the hands, but in the 9th
By extending the guide 9' shown in the figure and guiding the printing paper to the feed pins 22 of the printing paper transport units 2a and 2b, it is possible to automatically load the printing paper 1, and the conventional complicated setting of the printing paper 1 is eliminated. This opens the door to providing a printing device with good operability.

〔Effect of the invention〕

As described above, the printing device of the present invention includes a detector that detects the width of the printing paper and a drive mechanism that positions the paper conveyance unit based on the signal from the detector, so that the printing paper can be easily attached to the device. This has the effect that it is possible to provide a printing device with extremely good operability.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a conventional printing device. Fig. 2 is a schematic diagram of a printing paper route of a conventional printing device. Fig. 3 is a schematic diagram of a print transport unit of a conventional printing device. Fig. 4 is a schematic diagram of a conventional printing device. FIG. 5 is a perspective view of a printing paper conveyance unit in an embodiment of the present invention; FIG. 6 is a side view of FIG. 5; FIG. A schematic diagram of a printing paper width detection mechanism in an embodiment of the present invention; FIG. 8 is a configuration diagram of a paper guide of a printing paper width detection mechanism in an embodiment of the present invention; and FIG. It is a schematic diagram of a printing paper route in an example. 1...Print paper 2a, 2b...Paper transport units 16a, 16b...Paper guide 18...
Motor 19...Position detection mechanism 1 cause Figure 2 Figure 3 1○ Figure 4

Claims (1)

[Claims] In a printing device that has a pair of paper transport units that transport printing paper using a sprocket wheel of the printing paper, there is a detection mechanism that detects the width of the printing paper, and a position corresponding to the width of the printing paper that receives a signal from the detection mechanism. 1. A printing device comprising: a drive mechanism that automatically positions a paper conveyance unit to a paper conveyance unit.