JPH058456A - Printer - Google Patents

Abstract

PURPOSE:To certainly transmit the moving speed of a printing head to an encoder and to enable printing reduced in printing irregularity by meshing the first gear provided in a printing head with a rack. CONSTITUTION:The first gear 24 provided in a printing head 20 is rotated on the rack 26 arranged in an apparatus main body 10 at the same speed corresponding to the moving speed of the printing head 20. The rotational speed thereof is detected by an encoder 30 and the driving of a printing element is controlled corresponding to the detected speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus which prints at a predetermined position by manually moving a print head with a main body placed on a print medium.

[0002]

2. Description of the Related Art Conventionally, as this type of printing apparatus, a manual type printing apparatus has been commercially available which controls the printing element according to the moving speed by moving the apparatus main body by a manual operation on a printing medium ( (Actual No. 63-176641).

This type of manual printing apparatus controls the drive of the printing element in accordance with the moving speed of the print head, and therefore has a contact roller that contacts the print medium and rotates in accordance with the movement of the print head. It has a signal generating means for generating a timing signal in synchronization with the rotation of the paper contact roller and a means for detecting the signal and analyzing the result.

[0004]

However, in the above-mentioned manual printer, the unevenness of rotation of the paper contact roller occurs due to the difference in the surface shape of the print medium and the pressure contact force of the print head with respect to the print medium. There is a drawback that uneven printing occurs.

The present invention has been made to solve the above-mentioned problems, and provides a printing apparatus having a detection means for detecting the speed of a print head by a manual operation with a simple and inexpensive structure. With the goal.

[0006]

In order to achieve this object, a printing apparatus of the present invention is a printing apparatus for performing printing while holding the apparatus main body on a printing medium, and printing on the printing medium. In order to make the print head movable by manual operation, a rack provided in the movable range of the print head in the main body of the apparatus, a print head provided on the print head, and in contact with the rack, the moving speed of the print head is increased. A gear that rotates accordingly, an encoder that detects the rotational speed of the gear, and a control unit that controls the drive of the printing element based on the rotational speed detected by the encoder.

[0007]

In the printing apparatus of the present invention having the above structure, when the print head is manually moved while holding the apparatus main body on the print medium, the gear provided on the print head is provided inside the apparatus main body. Rotate at the same speed according to the moving speed of the print head on the rack. Then, the rotation speed is detected by the encoder, and the drive of the printing element is controlled according to the detected rotation speed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a plurality of input switches 12 and the respective input switches 12 are provided on the upper right side of the printer main body 10.
There is provided a menu roller 14 showing a function designated by, and a selection dial 16 for selecting a menu of the menu roller 14. The menu roller 14 is provided with a plurality of menus displaying characters, symbols, functions and the like as many as the input switches 12, and each input switch 12 has a function corresponding to each of the menus selected by the selection dial 16. Fulfill That is, for example, when inputting the hiragana "so", turn the selection dial 16 to select the screen of the menu roller 14 in which the hiragana is displayed, and press the input switch 12 to which the hiragana "so" is assigned. input.

A display unit 18 is provided on the upper left side of the apparatus body 10, and the text displayed on the display unit 18 is stored in the memory of the apparatus body 10.

In FIG. 2, a printing section is provided below the apparatus body 10, and the print head 20 is provided in the apparatus body 10.
It is mounted so as to be slidable in the lateral direction by a guide shaft 22 fixed to. A first gear 24 is attached to the print head 20 so as to project from the bottom of the print head 20, and the first gear 24 is attached in parallel with a guide shaft 22 fixed to the apparatus body 10. It meshes with the rack 26.

The first gear 24 meshes with a second gear 28 to transmit its rotation to the encoder 30. The second gear 28 meshes with the disc gear 36. The disc gear 36 is joined to the rotating disc 32 having a slit 38 for detecting the speed of rotation. At the upper end of the rotating disc 32, the rotating disc 32
A rotation speed detector 34 for detecting the rotation speed is provided so as to sandwich the upper slit 38.

Next, the printing operation of the printing apparatus thus constructed will be described.

When the print head 20 is manually moved while the apparatus body 10 is held on the print medium, the first gear 24 meshes with the rack 26 in accordance with the moving speed of the print head 20 to rotate at the same speed. . The rotation is the second
Is transmitted to the gear 28, and further transmitted to the disc gear 36. The rotating disc 32 joined to the disc gear 36
Also rotates at the same speed as the disc gear 36. The rotation speed of the rotating disk 32 is detected by the rotation speed detector 34. The printing element control means controls the driving of the printing element in accordance with the detected speed.

As is clear from the above description,
When the print head 20 is moved by a manual operation, the first gear 24 meshes with the rack 26 and moves. Therefore, the moving speed of the print head can be accurately detected regardless of the shape of the print medium or the unevenness of the manual pushing force. Is possible. Therefore, the printing element can be appropriately controlled according to the detected speed. As a result, stable printing with less print unevenness can be performed.

The present invention is not limited to the embodiments described above in detail, and various modifications can be made without departing from the scope of the invention.

For example, the arrangement position of the rack does not need to be arranged in parallel with the guide shaft 22 as long as it is within the slidable range of the print head. Also, regarding the gear configuration for transmitting the moving speed of the print head, the number of gears, the size of gears, and the like can be changed.

[0018]

As is apparent from the above detailed description, according to the printing apparatus of the present invention, the print head 20 is meshed with the first gear 24 on the rack 26 arranged in the apparatus main body 10. It is configured to move while. Therefore,
The speed of the print head can be reliably transmitted to the encoder without being affected by variations in the shape of the print medium or an unstable power source such as manual operation. Then, it becomes possible to appropriately control the drive of the printing element according to the detected speed. This makes it possible to perform stable printing with less print unevenness.

[Brief description of drawings]

FIG. 1 is a diagram showing the overall configuration of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a moving speed detecting means of the print head of the apparatus.

[Explanation of symbols]

 10 Device Main Body 20 Print Head 24 First Gear 26 Rack 28 Second Gear 30 Encoder 32 Rotating Disc 34 Rotation Speed Detector 36 Disc Gear 38 Slit

Claims (1)

Claim: What is claimed is: 1. A printing device that performs printing while holding a device main body on a printing medium, wherein the printing head is movable by manual operation to print on the printing medium; A rack arranged in a movable range of the print head in the apparatus main body, a gear provided on the print head, rotating with the rack in contact with the rack, and a rotation speed of the gear are described. A printing apparatus, comprising: an encoder for detecting; and a control unit for controlling driving of a printing element based on a rotation speed detected by the encoder.