JPH04291361A - Image recorder - Google Patents

Abstract

PURPOSE:To smoothly mesh the rotary gear of a carrying roller attached to an opening and closing part with the roatating gear attached to a device main body. CONSTITUTION:The carrying roller 10 and the rotary gear 11 held by the opening and closing part 2 are held by an arm 16 which can rock while making a supporting shaft 15 a center, and are energized downward by a spring 17, furthremore, a gear stopper to keep the axle-to-axle distance of the rotating gears 7 and 11 to a specified value is provided. By such constitution, when the opening and closing part is closed, the opening and closing part can be closed without a trouble, since the gear 11 is movable with respect to the opening and closing part 2 even though the rotating gears do not correctly mesh. The rotary gears 7 and 11 correctly mesh and are kept in a correct clearance controlled by the gear stopper by rotating the gear 7 in that state, so that power can be transmitted.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording apparatus having a transport roller in an opening/closing section that can be opened and closed with respect to the main body of the apparatus.

0002

2. Description of the Related Art Conventionally, as shown in FIG. 5 and FIG. (not shown), a recording head 4, a developing device 5, a drive shaft 6, a rotating gear 7 attached thereto, a drive device (not shown) for the drive shaft 6, etc. A roller 9, a conveyance roller 10, a rotating gear 11 attached to the conveyance roller 10, a guide plate 12, and a winding roller 13
Image recording apparatuses equipped with the following are known. In this image recording device, when threading paper or during maintenance, the image recording device shown in FIG.
As shown in FIG. 6, the opening/closing part 2 can be opened upward from the apparatus main body 1, and by closing the opening/closing part 2 in the position shown in FIG.
The rotational force was transmitted from the drive device to the conveyance roller 10.

0003

[Problems to be Solved by the Invention] However, in this configuration, when the opening/closing section 2 is closed, the teeth of the rotating gear 11 disposed on the opening/closing section side are disposed on the device main body side as shown in FIG. If the opening/closing part 2 enters the tooth groove of the rotating gear 7, the opening/closing part can be closed without any problem, but as shown in FIG. If you try to push the opening/closing part 2 too hard, you may break the teeth of the rotating gear or other parts, or you may have to turn one rotating gear slightly by hand to close the opening/closing part, which is troublesome. There was a problem that.

The present invention has been made in view of the above-mentioned problems, and provides an image recording device that allows the opening/closing part to be easily closed in a predetermined position even if the teeth of the two rotating gears are not properly meshed. The purpose is to

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a first rotating gear held in the main body of the device, and a conveying roller held in the opening/closing section that is attached to the first rotating gear. A spring is provided that makes at least one of the second rotary gears that mesh with the gear movable and biases the second rotary gear to press the second rotary gear against the other rotary gear; A gear stopper is provided to prevent the distance between the shafts from becoming smaller than a predetermined value.

[0006]

[Operation] According to the above-described structure, even if the first rotating gear and the second rotating gear do not mesh properly when the opening/closing section is closed, the movable rotating gear escapes, thereby interfering with the opening/closing section. After that, when either of the rotating gears rotates, the teeth naturally engage, are pushed in by the spring, and the gear stopper maintains the clearance between both rotating gears at an appropriate value, ensuring good power transmission. It will be done.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic configuration of an image recording apparatus according to an embodiment of the present invention, and is shown with the opening/closing section open. FIG. 2 shows the image recording device with the opening/closing section closed. Note that in FIGS. 1 and 2, parts that are the same as those in the conventional example shown in FIGS. 5 and 6 are denoted by the same reference numerals, and explanations thereof will be omitted. In FIGS. 1 and 2, the conveyance roller 10 provided on the side of the opening/closing section 2 is held by an arm 16 provided on the opening/closing section 2 so as to be swingable about a support shaft 15. and rotating gear 1 held therein
1 is movable so as to escape from the rotating gear 7 provided in the main body 1 of the apparatus. Furthermore, a spring 17 is connected to the arm 16 for biasing the rotary gear 11 held by the conveyance roller 10 in the direction of pressing the other rotary gear 7 .

FIG. 3 is a side view of the drive shaft 6 and the conveyance roller 10, showing a state in which the rotating gears 7 and 11 provided on each are engaged with each other. Drive shaft 6 and conveyance roller 1
0 is provided with ring-shaped gear stoppers 19a and 19b near both ends of the gear stoppers 19a and 19b, which prevent the distance between the shafts of the rotating gear 7 and the rotating gear 11 from becoming smaller than a predetermined value. ing. Here, this gear stopper 1
As shown in FIG. 4, the outer diameters of 9a and 19b are determined so that the rotating gear 7 and the rotating gear 11 mesh with each other with an appropriate clearance when the two come into contact.

Regarding the image recording apparatus configured as described above, the meshing operation of the rotating gears provided in the apparatus will be explained below.

As shown in FIG. 1, when the opening/closing section 2 is open, the spring 17 is in a compressed state, and the conveying roller 10 and rotating gear 11 held by the arm 16 are in a lowered state. When the opening/closing part 2 is moved downward and closed in this state, as shown in FIG. 11 cannot be lowered any further, but the arm 16 rotates counterclockwise while stretching the spring 17, and the opening/closing part 2 is lowered to a predetermined position and properly closed. During this process, even if the teeth of the rotary gear 11 butt against the teeth of the rotary gear 7 and cannot be properly engaged, the rotary gear 11 is only held at that position and the opening/closing part 2 is lowered and closed without any trouble. Thus, the rotating gear 7,
The opening/closing part 2 can be closed without applying a large load to the teeth 11. After that, when the rotating gear 7 rotates,
As the teeth move, the upper and lower rotating gears 7 and 11 naturally mesh correctly, and the spring force of the spring 17 pushes the rotating gear 11 toward the rotating gear 7, and as shown in FIG. 4, gear stops 19a and 19b are formed. are held in a meshed state where they are in contact. In this way, the rotating gears 7 and 11 are always kept at the correct clearance, and power is transmitted.

[0011] In the above embodiment, the upper rotating gear 11
is made movable by being held by the arm 16, but instead of this, the lower rotating gear 7 may be movable, or even both may be movable.

0012

Effects of the Invention As is clear from the above description, the present invention has a first rotary gear held in the main body of the device, and a conveyance roller held in the opening/closing portion that is attached to the first rotary gear and meshes with the first rotary gear. A spring is provided that makes at least one of the second rotating gears movable and urges the rotating gear to press against the other rotating gear, and further includes an axis between the first rotating gear and the second rotating gear. By providing a gear stopper that prevents the distance between them from becoming smaller than a predetermined value, even if the first rotating gear and the second rotating gear do not mesh correctly when the opening/closing part is closed, the rotation is still movable. Since the gear escapes, the opening/closing part can be closed without any problem.Then, when one rotating gear rotates, the teeth will mesh naturally.
In addition, the gear stopper allows the clearance between both rotating gears to be maintained at an appropriate value, and has the effect that smooth engagement of the rotating gears and smooth power transmission can be achieved at all times.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an image recording device according to an embodiment of the present invention with an opening/closing section open.

[Fig. 2] A schematic side view showing the above embodiment with the opening/closing part closed.

[Figure 3] Side view of the drive shaft and conveyance roller in the above embodiment

FIG. 4 is a schematic cross-sectional view showing the meshing of the upper and lower rotating gears and the contact state of the gear stopper in the above embodiment.

[Figure 5]
A schematic side view showing a conventional image recording device with the opening/closing part open.

[Fig. 6] A schematic side view showing the above conventional device with the opening/closing part closed.

[Fig. 7] A schematic side view showing a state in which the upper and lower rotating gears are correctly engaged in the above conventional device.

[Fig. 8] A schematic side view showing a state in which the upper and lower rotating gears are not properly engaged in the above conventional device.

[Explanation of symbols]

1　Device body 2 Opening/closing part 3 Recording paper 6 Drive shaft 7 Rotating gear 10 Conveyance roller 11 Rotating gear 15 Support shaft 16 Arm 17 Spring 19a, 19b Gear stopper

Claims (1)

[Claims] Claims: 1. A first rotary gear held in an apparatus main body; a transport roller held in an opening/closing part that can be opened and closed with respect to the apparatus main body and transports recording paper; a second rotating gear that meshes with the first rotating gear; at least one of the first rotating gear and the second rotating gear is provided movably; An image recording device comprising: a spring that urges the gear to press against the gear; and a gear stopper that prevents the distance between the axes of the first rotating gear and the second rotating gear from becoming smaller than a predetermined value.