JPS6292857A - Support mechanism for recording head - Google Patents

Abstract

PURPOSE:To enable images to be recorded with excellent image quality, by supporting a recording head at one point so that a recording part of the head makes uniform contact with a recording paper, in a movable-type recorder. CONSTITUTION:A recording head 9 is fixed to a head support plate 20, on which a flanged guide pin 21 as a means for vertically moving the head 9 is planted at a substantially central position of the side opposite to the head side. The head-moving means 21 is passed through a hole 22a for restricting the vertical position of the head formed in a head-restricting plate 22, and a tension spring 24 is fitted between the head-moving means 21 and a spring retainer 23 of the head-restricting plate 22 to normally energize the head 9 downward. Accordingly, the recording head is supported at one point, and conforms to the surface of a recording paper to make accurate contact with the latter, so that images can be recorded with excellent image quality.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mechanism for holding a recording head that records images and characters on recording paper.

[Prior art]

A mobile recording device that records on recording paper by moving it by hand has already been proposed, but the recording head built in there has a position in front of the head relative to the reference plane of the device that corresponds to the surface of the recording paper. In order to apply the head accurately, the entire head was pressed by a spring, and its structure was complicated.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording head holding mechanism that has a simple structure and allows the head and throat to uniformly contact the recording paper in a stable manner.

[Structure of the invention]

For this reason, in the present invention, the head is supported at one point so that the contact state of the recording section of the head with the recording paper is uniform.

〔Example〕

Examples of the present invention will be described below. FIG. 1 schematically shows a mobile copying apparatus.

In this copying apparatus, a reading section A and a recording section B are arranged from the rear end portion to the front end in the traveling direction a, and a control/storage section C is arranged above the recording section B.

The reading unit A uses an illumination light source 2 consisting of a plurality of LEDs lined up in a direction perpendicular to the figure above the reading window 1 and a CCD to read the read image.
It is composed of a lens 4 that forms an image on a line sensor 3 such as an MO3 solid ↑ most imaging element.

In the recording unit B, a running reference roller 5 and a running auxiliary roller 6 are arranged before and after the traveling direction on the lower surface thereof, and these rollers 5.6
A reference surface 7 for reading and recording is formed by the lower end of. A thermal head 9 faces from the recording window 8. 10 is a recording section (
A plurality of heating elements are arranged in a longitudinal direction perpendicular to the figure. ), the ink ribbon is suspended by a plurality of guide members 11 so as to pass through the ink ribbon, and is unwound from the original winding section 12 and wound onto a take-up reel 13.

The take-up reel 13 performs a take-up operation by receiving the rotational force of the traveling auxiliary roller 6 through the square heald 14.

Reference numeral 15 denotes an encoder that detects the amount of movement of the entire apparatus, and receives the rotation of the traveling reference roller 5 via a square belt 16.

In this copying apparatus, by setting the reading mode and moving it by hand in the direction of arrow a, it is possible to move from the reading window 1 to the reference surface 7.
The image of the document placed on the screen is read and temporarily stored in the memory of the control/storage section C. This reading timing is set corresponding to the signal from the encoder 15. Then, by setting the recording mode and moving the recording paper along the reference plane 7 in the direction of arrow a, the ink ribbon 10 is transferred onto the recording paper by the recording head 9.
Images and characters stored in memory will now be recorded. The recording timing at this time is also set by the signal from the encoder 15.

In this embodiment, in such a copying apparatus, the recording head 9 is held by a holding mechanism shown in FIGS. 2 to 4. In the figure, the recording head 9 is attached to the head holding plate 2.
The head holding plate 20 has a head vertical moving device (a guide pin with a flange) 21 implanted approximately in the center of the opposite side of the head holding plate 20 from the head 9 . Reference numeral 22 denotes a head regulating plate identified in the main body of the copying machine, and a spring holder (pin) 23 is installed in the center of the lower part of the head regulating plate, and a spring holder (pin) 23 is installed in the upper part of the spring holder 23 along the vertical direction. A throat vertical regulation hole 22a is formed. In addition, this head regulating plate 22
CFs 22b and 22c are formed by bending in opposite directions at one left and right ends and the other end. Then, the head vertical moving tool 21 of the head holding plate 20 is inserted into the head vertical regulating hole 22a of the head regulating plate 22, and the tension spring 24 is inserted between the head vertical moving tool 21 and the spring holder 23 of the head regulating plate 22. is suspended.

In this holding mechanism, the head 9 is
is always subjected to a downward pressing force (in the direction of the arrow), and the only part that supports the head regulating plate 22 is the head vertical moving tool 21. That is, the head 9 is supported at one point by the head regulating plate 22. In this case, vertical movement is guided by the head vertical regulation hole 22a, and horizontal movement is also regulated by the head vertical regulation hole 22a, but the direction of rotation about the head vertical moving tool 21 is guided by the head vertical regulation. It is not restricted by the hole 22a. but,
The collar 22C of the head regulating plate 22C restricts the angle beyond a certain angle range.

Therefore, since the head 9 can be tilted slightly in the longitudinal direction of its tip, the head tip uniformly contacts or presses along the recording paper.

In addition, in this holding mechanism, the difference between the length of the part of the head vertical moving tool 2 inserted into the hole 22a and the depth of this hole 22a is loose, and this looseness causes the head regulating plate 22 to move when the spring 24 is applied. This is the distance from the head holding plate 20. In order to suppress this separation distance to a certain level or less, as shown in the figure, a head floating preventer 25 (a flanged bottle) is formed in a vertical hole 22d in the head regulating plate 22.
It is sufficient to fix it to the head holding plate 20 by passing it through. In this case, the collar 22c of the head regulating plate 22 is unnecessary.

FIG. 5 shows another embodiment of the head holding mechanism.

In this embodiment, the head holding plate 20 is held at one point with respect to the head vertical moving tool 26 by a rotation holding member 27, and the head vertical moving tool 26 exerts a downward elastic force against the fixing tool 28. It is held so that it can be moved up and down.

The fixture 28 is fixed to the main body of the copying apparatus.

FIG. 6 shows details of this mechanism. The head vertical moving tool 26 includes a head regulating block 29.30 provided on the fixture 28 side, and another head regulating block 3 having a shaft 31 and a shaft 32 passed between both blocks 29.30.
3, and a pin 35 that locks one end of the spring 34. Further, on the vertical moving plate 36 side where the rotation holding member 27 is provided, there is a U-shaped positioning block 37 into which the shaft 31 is fitted, and a positioning block 3 through which the shaft 32 is inserted.
8, and a pin 39 to which the other end of the spring 34 is engaged.

In this embodiment, the vertically movable plate 36 is constantly pressed downward (in the direction of the arrow) with respect to the fixture 28 by the spring 34, and the head 9 is supported at one point by the rotary holding member 27, and the tip of the head 9 is supported in the longitudinal direction. Since it can be tilted slightly, the tip of the head uniformly contacts the recording paper.

FIG. 7 shows another embodiment of the head holding mechanism. In this embodiment, the head 9 is supported on a vertically movable rod 41 by a universal joint 40, and a downward pressing force (not shown) is applied elastically to the vertically movable rod 4. It is. In this example, a frame-shaped thickness direction regulating member 42 is provided so that the head 9 does not tilt in the thickness direction and can tilt slightly in the longitudinal direction at the tip of the head. This restrictor 42 has frame portions 42a and 42b on both sides, and is fixed to the main body of the copying apparatus.

In this embodiment as well, the head 9 has a universal joint 4.
It is supported at one point by 0, and in the longitudinal direction of its tip,
Since the gap between the head 9 and the regulating member 42 can be slightly tilted, the tip of the head uniformly contacts along the recording paper.

In addition, in the above, the head rotation regulating collar 22C of the embodiment shown in FIG. The flange plate 43 is fixed to the head regulating plate 22.
On the other hand, it is also possible to fix a stopper 44 near the head vertical regulation hole 22a so that the rotation of the collar plate 43 abuts the stopper 44 at a certain angle. Such a configuration can also be applied to the embodiments shown in FIGS. 4 and 6.

Further, in the embodiment shown in FIG. 7, the thickness direction regulating device 42 is not necessarily required. That is, as shown enlarged in FIG. 9, the hole 40b of the upper frame 40a of the universal joint 40
Thickness! , the hole diameter D of the hole 40b, and the vertically moving rod 41
By appropriately setting the outer diameter d of the vertically movable rod 41 relative to the hole 40b, the movement of the vertically movable rod 41 relative to the hole 40b is restricted to a certain angle or more, and therefore, the rotatable angular range can be set only by this portion. For example, the smaller the difference between d and D and the larger l, the smaller the angle through which the rod 41 can move.

〔Effect of the invention〕

As described above, according to the present invention, since the head is supported at one point, it comes into accurate contact with the recording paper following its surface, and excellent recording (printing) image quality can be obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a schematic configuration of a copying apparatus to which the present invention is applied, FIG. 2 is a perspective view showing a head holding mechanism according to an embodiment of the present invention, and FIG. 3 is taken along line m-m in FIG. Sectional view along, 4th
The figure is a sectional view taken along the line IV-IV in Figure 2, Figure 5 is a side view of a head holding mechanism of another embodiment, Figure 6 is an exploded perspective view of the mechanism in Figure 5, and Figure 7 is Furthermore, a perspective view of a head holding mechanism of another embodiment, FIG. 8 is a partial view showing a modified example of the head holding mechanism shown in FIG. 2, and FIG. 9 is a modified example of the head holding mechanism shown in FIG. 7. It is a sectional view of the universal joint part showing. 9... Recording head. Agent: Patent Attorney Tsuneaki Nagao) l /1 j159'
86 Figure 2 2d Figure 3 Figure 4 Figure 5 Figure 7

Claims (4)

[Claims] (1) In an apparatus having a recording head for recording images or characters by contacting or pressing a recording paper, the head is supported at one point, and the state of contact of the recording section of the head with the recording paper is uniform. A recording head holding mechanism characterized in that: (2) The recording head holding mechanism according to claim 1, wherein rotation of the recording head is regulated at a predetermined angle. (3) Claim 1, wherein the recording head is in the shape of a thick plate, and the recording tip is linear.
Holding mechanism for the recording head described in Section 1. (4) The recording head holding mechanism according to claim 1, wherein the device is of a movable type.