JP2000074933A - Angular velocity detecting mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an angular velocity detecting mechanism in which the number of components required for mounting constitution components is reduced, whose cost can be reduced and which simplifies the mounting structure. SOLUTION: The angular-velocity detecting mechanism is provided with an L-shaped frame 12 which is composed of a first mounting part 12a and a second mounting part 12b which are mutually nearly at right angles a support shaft 27 which is attached to the first mounting part 12a so as to be freely detachable and which is extended nearly parallel to the second mounting part 12b, a disk-shaped rotating body 15 which is supported by the support shaft 27 so as to be turned and driven and which comprises a slit part 15a, and a sensor 17 which is attached to the second mounting part 12b and which comprises a light emitting part 17a and a light receiving part 17b which are faced via the disk-shaped rotating body 15 from its thickness direction. At this time, after the sensor 17 is attached to the second mounting part 12b, the support shaft 27 to which the disk-shaped rotating body 15 is attached is attached to a prescribed mounting position on the first mounting part 12a. Thereby, the angular-velocity detecting mechanism is assembled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angular velocity detecting mechanism for detecting an angular velocity of a disk-shaped rotating body.

[0002]

2. Description of the Related Art Conventionally, in various OA devices, a method has been adopted in which the angular velocity of a disk-shaped rotating body is detected by a sensor for controlling the speed of an operating unit, and the detection result is fed back to a control unit. There are various types of mechanisms for detecting the angular velocity of such a disc-shaped rotator. For example, a slit portion is formed in the disc-shaped rotator, and a light-emitting section and a light-receiving section are formed through the disc-shaped rotator from the thickness direction thereof. And a sensor using a light emitting unit and a light receiving unit to detect the number of times of passage through the slit unit is known.

An example of an angular velocity detecting mechanism for detecting the angular velocity of a disk-shaped rotating body having a slit formed by using a sensor having a light emitting section and a light receiving section will be described with reference to FIGS. FIG. 2 shows the overall structure of a printer having the above-described angular velocity detecting mechanism. This printer comprises a printer main body 1 and a supply holder 2.
In the printer body 1, a ribbon holder shaft 4 on which the ink ribbon 3 is mounted, a ribbon winding shaft 5 for winding the ink ribbon 3 pulled out from the ribbon holder shaft 4, a platen 6,
A print head 7 and the like are provided. Roll paper 8 is mounted on the supply holder section 2, and the roll paper 8 pulled out from the supply holder 2 is superimposed on the ink ribbon 3 between the platen 6 and the print head 7.

FIG. 3 shows a power transmission mechanism for feeding a ribbon in a printer. A ribbon holder shaft 4 and a ribbon take-up shaft 5 are attached to a main frame 9.
A holder gear 10 is fixed to an end of the ribbon holder shaft 4, and a winding gear 11 is fixed to an end of the ribbon winding shaft 5.

In the vicinity of the main frame 9, the holder plate 12 and the winding plate 1 are arranged in parallel with the main frame 9.
3 are arranged. A drive motor 14, a slit gear 15, an idle gear 16, and a sensor 17 are attached to the holder plate 12. A drive motor 18, a slit gear 19, an idle gear 20, and a sensor 21 are attached to the winding plate 13. The slit gears 15 and 19 are formed with a large number of slit portions 15a and 19a for angular velocity detection at equal intervals in the circumferential direction.

FIG. 4 shows the details of the structure for attaching the slit gear 15 and the sensor 17 constituting the angular velocity detecting mechanism to the holder plate 12. The holder plate 12 is formed in a substantially L-shape having a first mounting portion 12a and a second mounting portion 12b. The surface of the first mounting portion 12a has a second
A support shaft 22 extending substantially parallel to the mounting portion 12b is fixed by caulking or the like. The slit gear 15 is attached to the tip of the support shaft 22 by an E-ring 23.

An opening 24 is formed in the second mounting portion 12b, and the light emitting portion 17a and the light receiving portion 1 are formed in the second mounting portion 12b.
7b is attached. Second
The attachment of the sensor 17 to the attachment portion 12b
After attaching the sensor mounting plate 25 to the sensor mounting plate 25, the sensor mounting plate 25 is screwed to the back surface of the second mounting portion 12b.
At the same time, the sensor 17 is
This is performed by projecting to the surface side of the mounting portion 12b. The light emitting portion 17a and the light receiving portion 17b of the sensor 17 attached to the second attachment portion 12b face each other through the slit gear 15 from the thickness direction.

A slit gear 1 constituting an angular velocity detecting mechanism
The same applies to the mounting structure of the sensor 9 and the sensor 21 to the winding plate 13, and the description is omitted.

Here, if the sensor 17 is directly mounted on the surface of the second mounting portion 12b after the slit gear 15 is mounted on the support shaft 22, the light receiving portion 17b collides with the slit gear 15 and cannot be mounted. on the other hand,
When the slit gear 15 is mounted on the support shaft 22 after the sensor 17 is mounted on the second mounting portion 12b, the slit gear 15 hits the light emitting portion 17a and cannot be mounted. Therefore, as described above, the sensor 17 is mounted on the second mounting portion 12b using the sensor mounting plate 25.

[0010]

Therefore, according to the angular velocity detecting mechanism described with reference to FIGS.
Sensor mounting plate 2 as a part for mounting
5 and screws 26 are required, which increases the number of parts and the number of assembling steps, thereby increasing costs.

Further, when replacing the slit gear 15, the sensor 17 must be removed, which is troublesome.

Accordingly, an object of the present invention is to provide an angular velocity detecting mechanism having a simple mounting structure.

[0013]

According to a first aspect of the present invention, there is provided an angular velocity detecting mechanism, comprising: an L-shaped frame comprising a first mounting portion and a second mounting portion which are substantially orthogonal to each other; A support shaft extending substantially parallel to the second mounting portion, and a disk-shaped rotating body having a slit supported by the support shaft and driven to rotate, and mounted on the second mounting portion. And a sensor having a light emitting unit and a light receiving unit that face each other from the thickness direction via the disc-shaped rotator.

Therefore, after the sensor is mounted on the second mounting portion, the support shaft on which the disk-shaped rotating body is mounted can be moved to a predetermined mounting position, and the support shaft can be mounted on the first mounting portion. When the support shaft supporting the disc-shaped rotator is moved to a predetermined mounting position, the disc-shaped rotator moves while the light emitting unit and the light receiving unit face each other. For this reason, the mounting structure for mounting the sensor and the disk-shaped rotator on the L-shaped frame is simplified, and the number of components required for mounting the sensor and the disk-shaped rotator on the L-shaped frame is reduced. When replacing the disk-shaped rotating body, there is no need to remove the sensor, and the replacement operation can be easily performed.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. 2 to 4 are denoted by the same reference numerals, and description thereof will be omitted.
The holder plate 12, which is an L-shaped frame, includes a first mounting portion 12a and a second mounting portion 12b that are substantially orthogonal to each other. A support shaft 27 is detachably attached to the first attachment portion 12a by a screw 28, and the support shaft 27 is attached to the second attachment portion 1a.
2b. A slit gear 15, which is a disk-shaped rotating body, is detachably attached to the tip of the support shaft 27 by using an E-ring 23. This slit gear 1
5 is rotationally driven by the driving force from the driving motor 14,
The slit gear 15 has a large number of slit portions 15.
a are formed at equal intervals in the circumferential direction (see FIG. 3).

A sensor 17 having a light emitting portion 17a and a light receiving portion 17b is mounted on the second mounting portion 12b. The light emitting portion 17a and the light receiving portion 17b face each other in the thickness direction via a slit gear 15 attached to a predetermined attachment position.
The angular velocity of the slit gear 15 is detected by counting the number of slit portions 15a that have passed through the gap gear 7b.
The sensor 17 is connected to a control unit via a lead wire (not shown).

In such an arrangement, in the process of assembling the angular velocity detecting mechanism, first, the sensor 17 is connected to the second mounting portion 1.
2b, and the support shaft 27 to which the slit gear 15 is attached is moved to a predetermined attachment position.
It is fixed to the mounting part 12a. At this time, at the final stage of moving the support shaft 27 to a predetermined mounting position, the support shaft 27 is moved to the first position.
The support shaft 2 is moved in parallel with the mounting portion 12a.
7 is moved to a predetermined mounting position when the slit gear 15
Moves between the light emitting unit 17a and the light receiving unit 17b facing each other.

For this reason, the sensor 17 and the slit gear 1
Only the screw 28 is required as a component required for mounting the 5 on the holder plate 12, and the number of components required for mounting is reduced. In addition, the structure for attaching the sensor 17 and the slit gear 15 to the holder plate 12 is simplified.

When replacing the slit gear 15, the screw 28 is removed and the slit gear 15 is moved together with the support shaft 27 to the first position.
This can be done by removing the sensor 17 from the mounting portion 12a.
Need not be removed from the second mounting portion 12b. For this reason, the replacement work of the slit gear 15 can be easily performed without trouble.

[0020]

According to the angular velocity detecting mechanism of the present invention, after the sensor is mounted on the second mounting portion of the L-shaped frame, the support shaft on which the disk-shaped rotating body is mounted is moved to a predetermined mounting position. The support shaft can be attached to the first mounting portion of the L-shaped frame by moving, and when the support shaft supporting the disk-like rotating body is moved to a predetermined mounting position, the disk-like rotating body is connected to the light emitting unit. It can be moved to a position facing the light receiving unit. For this reason, the mounting structure for attaching the sensor and the disc-shaped rotating body to the L-shaped frame can be simplified,
Further, the number of components required for attaching the sensor and the disk-shaped rotating body to the L-shaped frame can be reduced. Further, when replacing the disk-shaped rotator, there is no need to remove the sensor, and the replacement operation can be easily performed.

[Brief description of the drawings]

FIG. 1 is a side view showing a mounting structure of an angular velocity detecting mechanism according to an embodiment of the present invention.

FIG. 2 is a front view showing the overall structure of a printer employing a conventional angular velocity detecting mechanism.

FIG. 3 is a front view showing a power transmission structure of the printer.

FIG. 4 is a side view showing a mounting structure of the angular velocity detecting mechanism.

[Explanation of symbols]

 12 L-shaped frame 12a First mounting portion 12b Second mounting portion 15 Disc-shaped rotating body 15a Slit portion 17 Sensor 17a Light emitting portion 17b Light receiving portion 27 Support shaft

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shunji Shimozato 570 Ono-cho, Oni-cho, Tagata-gun, Shizuoka Prefecture Inside the Tech Ono Works Co., Ltd. 2F077 AA46PP19 VV31

Claims (1)

[Claims] An L-shaped frame comprising a first mounting portion and a second mounting portion which are substantially perpendicular to each other; and an L-shaped frame removably mounted on the first mounting portion and extending substantially parallel to the second mounting portion. The support shaft that has been protruded, a disk-shaped rotating body having a slit portion that is supported by the support shaft and driven to rotate, and that is attached to the second mounting portion and faces from the thickness direction via the disk-shaped rotating body. An angular velocity detection mechanism including a sensor having a light emitting unit and a light receiving unit.