JP3269846B2 - Recording device - Google Patents

Abstract

PURPOSE:To prevent the magnetized part of a scale from being damaged by holding a magnetic head on the scale detachably by a holding means and further providing a tension applying and fitting means which applies tension to the scale and fits it to the side plate of a recording device main body. CONSTITUTION:The scale 101 is fitted with two bearings 22 and 22 at a proper interval and those bearings 22 are provided with housings 24 having grooves which are sectioned almost in a semicircular shape by molding so that the housing can be fitted onto the bearings 22 by pressing. The housings 24 are fitted integrally with magnetic heads 102 and signal lines 103. The housings 24 are fitted onto the bearings 22 of the scale 101 by pressing and slidable along the scale 101 through the bearings 22. Consequently, the magnetized part of the scale is prevented from being damaged to prevent memory effect from being lost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus using a magnetic linear encoder.

[0002]

2. Description of the Related Art First, referring to FIG. 4, an outline of a conventional recording apparatus using a magnetic linear encoder will be described. A recording head 1 mainly has an ink jet and an ink tank integrally. . The recording head unit 1 is preferably one that is detachably attached to this recording apparatus.
When the ink in the ink tank is exhausted, a new recording head can be replaced.

A carriage 2 on which a recording head unit 1 is mounted
Has a pin (not shown) that engages with a spiral groove of the lead screw 3 that rotates via a transmission mechanism (not shown) in conjunction with forward and reverse rotation of a carrier motor (not shown). Then, the lead screw 3 is reciprocated in the directions of arrows a and b as the lead screw 3 rotates. The magnetic head 102 reads the magnetized portion of the scale 101 by using an MR element (not shown in FIG. 4).

The conveying roller 4 moves the recording sheet 5 by an arrow c in the figure.
The recording sheet 5 is intermittently fed during recording. A flexible printed circuit board 103 for extracting an output signal from an MR element in the magnetic head to the outside is connected to the magnetic head 102, and a contact portion 104 is connected to a connector (not shown) so that a carriage is provided. 2 is connected to a substrate 6 mounted on the substrate 2.

As shown in FIG. 5, which is a side sectional view of a magnetic linear encoder used in a recording apparatus, a scale 1 is shown.
The magnetized portion 105 of the magnetic head 102 is provided on the upper portion of the scale.
02a is arranged to read.

[0006]

In the conventional example, since the scale of the magnetic linear encoder has a magnetized portion on the upper surface, it is easy to touch the user's hand, the magnetized portion is damaged, and the memory effect of magnetizing is reduced. There was a problem of being damaged.

Accordingly, it is an object of the present invention to provide a recording apparatus configured so that a user does not easily touch a magnetized portion of a scale of a magnetic linear encoder.

[0008]

In order to achieve the above-mentioned object, the present invention provides a carriage which moves along a guide member, and a scale provided opposite to the guide member and provided with a magnetized portion on a lower surface. A magnetic linear encoder including a unit and a magnetic head mounted on the carriage and reading the magnetized unit from below the scale unit. In order to protect the recording apparatus, a recording apparatus is provided which is provided with a scale guide covering the magnetized portion.

[0009]

Next, a preferred embodiment of the present invention will be described with reference to the drawings. The material, shape, magnetization direction, and the like of the scale portion of the magnetic linear encoder suitable for use in the present invention will be outlined in advance. As the magnet material of the scale portion, an Fe—Cr—Co magnet is preferable. This magnet has the same magnetic properties as an alnico magnet, and is a material that overcomes the hard and brittle weaknesses of a permanent magnet. A 0.1 mm wire or plate can be easily mass-produced by rolling or drawing. This magnet material is used for sputtering, evaporation, CVD
Etc., or as an alloy made by sintering or a normal alloying method. In addition, the cross section is circular or rectangular (square)
Although it is a wire or a plate having an arbitrary shape such as the above, it can be easily obtained at low cost by using the above-mentioned magnet material. Also,
The magnetization direction is preferably perpendicular magnetization in order to make the pitch fine (a fine pitch is required when dot control with higher precision than monochrome printing is required, for example, in color printing). The material, shape, magnetization direction, and the like of the scale portion of the magnetic linear encoder suitable for use in the present invention are as described above, but the present invention is not limited to these unless particularly limited to the claims. The material, shape, magnetization direction and the like of the scale part are not limited. Further, as a magnetic detection head suitable for use in the present invention, an MR element which is a magnetoresistive element made of an iron / nickel alloy is preferable.
It is not limited to the element.

FIG. 1 is a side sectional view showing a magnetized state of a scale of a magnetic linear encoder according to a first reference example of the present invention. As shown in FIG.
1, the magnetic head 102a is arranged to read the magnetized portion 105 from below. By providing the magnetized portion 105 on the back side of the carriage 2 as described above, loss of the memory effect due to damage of the magnetized portion 105 due to contact by a user or dust from the outside as in the conventional example is prevented. Is done.

FIG. 2 is a side sectional view of a magnetic linear encoder according to a second embodiment of the present invention. In the first reference example, the scale 101 has an axial shape. However, as shown in FIG. 2, the second reference example shows an example in which the scale 106 uses a square rod-shaped magnetic material. It is provided on the back side of the carriage 2. For this reason, loss of the memory effect due to damage of the magnetized portion 105 due to contact by the user or dust from the outside as in the conventional example is also prevented.

FIG. 3 is a side sectional view of a magnetic linear encoder according to a first embodiment of the present invention. In the first embodiment, similarly to the first reference example, the magnetized portion 105 is disposed on the lower surface of the shaft-shaped scale 101, that is, on the rear surface side of the carriage. The scale guide 107 is disposed so as to cover the entire circumference of the scale. This provides more complete protection against loss of the memory effect. The scale guide 107 can be formed separately from or integrally with the carriage 2.

[0013]

As described above, according to the present invention,
Damage to the magnetized portion of the scale can be prevented, and loss of the memory effect can be prevented.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a magnetized state of a scale of a magnetic linear encoder according to a first reference example of the present invention.

FIG. 2 is a side sectional view of a magnetic linear encoder according to a second embodiment of the present invention;

FIG. 3 is a side sectional view of the magnetic linear encoder according to the first embodiment of the present invention.

FIG. 4 is an overall perspective view of a conventional recording apparatus.

FIG. 5 is a sectional view of a conventional magnetic linear encoder.

[Explanation of symbols]

 101 scale 100 side plate 102 magnetic head 102a MR element 103 flexible printed board 105 magnetized part

──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshiaki Kangi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Nobuaki Iwagami 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Shigemitsu Tazaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Yuichi Hirai 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Kazuyoshi Yoshida 3- 30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Shigeo Takenaka 3- 30-2 Shimomaruko 3-chome, Ota-ku, Tokyo Canon Inc. (56) References JP-A-63-7961 (JP, A) JP-A-59-226820 (JP, A) JP-A-59-60511 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name ) B41J 19 / 18 G01D 5/245 101

Claims (1)

(57) [Claims] A carriage that moves along a guide member; a scale portion provided opposite to the guide member and provided with a magnetized portion on a lower surface; and the magnetized portion mounted on the carriage from below the scale portion. A magnetic linear encoder including: a magnetic head that reads a magnetic section; anda scale guide that covers the magnetized section in order to protect the memory effect of the magnetized section from being lost. A recording device characterized by the above-mentioned.