JPH037368A - Adjusting mechanism of gap of printing head - Google Patents

Abstract

PURPOSE:To easily switch a gap adjusting means thereby to make an adequate treatment to a paper by providing each separate eccentric shaft with a manual gap adjusting means and an automatic gap adjusting means. CONSTITUTION:When a paper 101 or the like is processed by a manual gap adjusting means 6, an operating lever 14 should be manipulated to adjust a printing head gap. In this case, the operating lever 14 is engaged with a predetermined protrusion 22 with a click, so that a proper gap is obtained corresponding to the thickness of the paper 101. The operating lever 14 is not engaged with a microswitch 23 in the manual gap adjustment. Therefore, the microswitch is in the OFF state and an automatic gap adjusting means 7 is not actuated. On the other hand, when the paper is processed through an automatic gap adjustment, the operating lever 14 is positioned at a position indicated by a chain line. At this time, a contact point 23a of the microswitch 23 is depressed by the operating lever, so that the microswitch is turned ON, thereby bringing the automatic gap adjusting means 7 into the operable state.

Description

[Detailed Description of the Invention] [Summary] Regarding the print head gap adjustment mechanism of a printer device, the purpose of this invention is to easily adjust the gap between the platen and the print head manually or automatically, and to provide a carrier on which the print head is mounted. , a first eccentric shaft provided parallel to the platen, into which an end of the carrier on the platen side fits; and a first eccentric shaft provided parallel to the platen, an end of the carrier far from the platen fits into the first eccentric shaft; In the printer device movably supported by a second eccentric shaft that engages with the platen so as to move forward and backward, the first eccentric shaft is rotated by manual operation of a lever to adjust the gap between the platen and the print head. A configuration comprising a manual gap adjustment means and an automatic gap adjustment means that adjusts the gap by automatically rotating the second eccentric shaft according to the detection result of the automatic paper thickness detection by controlling a motor. do.

[Industrial application field]

The present invention relates to a print head gap adjustment mechanism for a printer device.

[Conventional technology]

In wire dot impact printers, it is necessary to adjust the gap between the print head and the platen (hereinafter referred to as print head gap) depending on the thickness of the paper to be printed, in order to prevent head pin damage and uneven print density. .

Therefore, as disclosed in Japanese Patent Publication No. 62-246768, one eccentric shaft that supports and guides the carrier is provided with a manual gap adjustment means and an automatic gap adjustment means controlled by a motor. The gap was adjusted by selecting and switching the gap adjusting means as appropriate.

[Problem to be solved by the invention]

However, since this mechanism shares one eccentric shaft, a lever is required to select both gap adjustment means, and when automatic adjustment is used, the manual lever is attached to the engaging part (which gives a click feeling). A mechanism is required to allow the material to escape from the hole or protrusion.

SUMMARY OF THE INVENTION An object of the present invention is to provide a print head gap adjustment mechanism that can easily adjust the gap between a platen and a print head both manually and automatically.

[Means to solve the problem]

Fig. 1 is an explanatory diagram of the principle of the present invention. In the figure, ■ is a carrier on which the print head 2 is mounted, 3 is a platen, 4 is a first eccentric shaft, 5 is a second eccentric shaft, and 6 is a manual gap adjustment. Means 7 is an automatic gap adjustment means.

The first eccentric shaft 4 is provided parallel to the platen 3, and, for example, a support shaft 9 is integrally coupled to both ends of a shaft 8, into which the end of the carrier 1 on the platen 3 side is fitted, via a D-cut portion IO. It is configured as follows. The support shaft 9 is eccentric by a predetermined amount with respect to the shaft 8, and is supported by a frame of an apparatus (not shown).

The second eccentric shaft 5 is provided parallel to the platen 3, and, for example, the shirt 1-11 is fixed at the upper and lower ends of the carrier l on the side far from the platen 3 (maintained so as to be movable toward the platen 3). A support shaft 12 is integrally connected to both ends of the shaft via a D-cut portion 13. The support shaft 12 is eccentric to the shaft 11 by a predetermined amount and is supported by the frame of the apparatus.

The manual gap adjustment means 6 is for adjusting the print head gap by manually rotating the first eccentric shaft 4, and in this figure, the manual gap adjustment means 6 is a control lever 14 fixed to the D-cut portion 10 of the support shaft 9. An example of a configuration including the following is shown. In reality, a member or the like is used to provide a click feeling when positioning the operating lever 14, but it is omitted in this figure.

□The automatic gap adjustment means 7 is for adjusting the print head gap by automatically rotating the second eccentric shaft 5 under the control of a motor. An example is shown in which the gear 16 is fixed to the support shaft 12 and the gear 17 is fixed to the support shaft 12 and meshes with the gear 16.

[Effect]

During manual adjustment, the first eccentric shaft 4 is rotated by a predetermined amount in the direction of the arrow by the manual gap adjustment means 6 (rotated by operating the operating lever 14).During this rotation, the shaft 8 is eccentric with respect to the support shaft 9. Therefore, the print head 2 is driven via the carrier l and moves forward and backward by a predetermined amount in the direction of the arrow.
□The print head gap is adjusted to suit the paper thickness used. This movement of the print head 2 is not restricted by the second eccentric shaft 5 because the engagement state between the rear end of the carrier 1 and the second eccentric shaft 5 is set as described above. It is done smoothly.

During automatic adjustment, the second eccentric shaft 5 is rotated by the self-gap adjusting means 7 (the gear 16 is rotated by the operation of the motor 15).
．． 17) to adjust the print head gap.

In this case, the amount of rotation of the second eccentric shaft 2 is set in accordance with the paper thickness detected by a known automatic paper thickness detection means (disclosed in Japanese Patent Publication No. 63-233864, etc.). The rotation of the second eccentric shaft 5 causes the carrier 1 to rotate by a predetermined amount, and this rotation automatically adjusts the print head gap suitable for the thickness of the paper being used.

Such switching between manual adjustment and automatic adjustment can be performed, for example, as follows.

During normal paper processing, the print head gap is automatically adjusted. By the way, as shown in Figure 2, Rahel 102
When using special paper 101 with a label pasted on it, the paper detection position and printing position are as shown by the arrows, and the interval between the print heads becomes small in the part where the label is pasted, making it impossible to print properly. In such a case, manual adjustment is performed to achieve an appropriate print head gap for processing.

Note that it is of course possible to use manual adjustment during normal paper processing.

〔Example〕

The present invention will now be described in detail with reference to FIGS. 3 to 6.

3 is a plan view showing the main structure of a printer device to which the present invention is applied, FIG. 4 is a front view of the same, FIG. 5 is a perspective view of the same, and FIG. 6 is a side view of the same. 1 is a frame of the device not shown in FIG.

Note that the same members as in FIG. 1 are given the same reference numerals.

The manual gap adjustment means 6 includes the aforementioned operating lever 14, a plurality of protrusions 22 provided on the frame 21, and a microswitch 23.

The protrusions 22 are for positioning the operating lever 14 by giving a click sensation when setting the operating lever 14 to a predetermined position, and are arranged at a predetermined pitch in the circumferential direction with the center of the support shaft 9 as the fulcrum. It is located in Micro switch 23
is from manual gap adjustment to automatic gap adjustment [1! This is to enable switching to normal mode, and is attached to the frame 21.

The paper 101 is adjusted by the manual gap adjustment means 6 (see Fig. 6).
etc., the print head gap is adjusted by operating the operating lever 14 as described above, but in this case, the operating lever 14 is positioned by engaging with a predetermined protrusion 22 with a click motion, An appropriate print head gap corresponding to the thickness of the paper 100 can be obtained. During this manual gap adjustment, the operating lever 14 does not engage with the microswitch 23, the microswitch is in the OFF state, and the automatic gap adjustment means 7 does not operate.

When paper processing is performed by automatic gap adjustment, the operating lever 14 is positioned at the position shown by the chain line in FIG. As a result, the microswitch 23 is activated by the operation lever at contact 2.
3a is pressed and turned on, and the automatic gap adjustment means 7 becomes ready for operation.

The gap adjustment by the automatic gap adjustment means 7 is performed as described above.
This is performed by rotating the motor 15 by an amount corresponding to the paper thickness detected by an automatic paper thickness detection means disclosed in Japanese Patent Publication No. 63-233864.

〔Effect of the invention〕

As described above, according to the present invention, by providing the manual gap adjustment means and the automatic gap adjustment means on separate eccentric shafts, the gap adjustment means can be easily switched, and the It becomes possible to perform processing appropriately.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the principle of the present invention; Fig. 2 is an explanatory diagram of problems during automatic gap adjustment of special paper; Fig. 3 is a plan view showing an outline of the structure of a printer device according to an embodiment of the present invention; is a front view of the same, FIG. 5 is a perspective view of the same, and FIG. 6 is a side view of the same, in which 1 is a carrier, 2 is a print head, 3 is a platen, 4 is a first eccentric shaft, and 5 is a second eccentric shaft. 6 is a manual gap adjustment means, 7 is an automatic gap adjustment means, and 15 is a motor.

Claims (1)

[Claims] A carrier (1) on which a print head (2) is mounted is provided in parallel with a platen (3), and an end of the carrier (1) on the platen (3) side fits into the carrier (1). The eccentric shaft (4) of the carrier (1) is provided parallel to the platen (3), and the end of the carrier (1) on the side far from the platen (3) engages with the eccentric shaft (4) of the carrier (1) so as to be able to move forward and backward toward the platen (3). In the printer device movably supported by a second eccentric shaft (5), the first eccentric shaft (4) is manually rotated to create a gap between the platen (3) and the print head (2). A manual gap adjustment means (6) for adjusting the gap, and a motor (15) that automatically rotates the second eccentric shaft (5) according to the detection result of the automatic paper thickness detection means to adjust the gap. Automatic gap adjustment means (7) for adjusting
A print head gap adjustment mechanism characterized by comprising: