JPH03107647A - Gear rotation transmitting device - Google Patents

Abstract

PURPOSE:To suppress the radial vibration of a gear and economically moderate the generation of a noise by providing gear press members disposed on a shaft support member and formed in respective positions corresponding to a plurality of gears in an elastic gear press part for pressing the gear in contact with the side surface of the gear. CONSTITUTION:When a motor 2 is driven to rotate an output shaft 3 for rotation transmission, this rotation is transmitted from a gear 4 to gears 7, 8, and the rotation of the gear 8 is transmitted to a gear 10. The gears 7, 6 are pressed and supported by the elastic force from the gear press part 13 of a gear press member 12. Therefore, even when the contact between the inner circumferential surface of a shaft hole 9 and the outer circumferential surface of a shaft 5 is uneven by a manufacturing error between the gears 7, 8 and the shaft 5, and the gears 7, 8 are rotated in the state unstably supported by the shaft 5, the radial vibration of the gears 7, 8 is sufficiently suppressed, and the generation of a noise accompanied by the vibration is prevented. The gear 10 is pressed and supported by the elastic force from the gear press part 14 of the member 12. Therefore, the same can be said for the relation between the gear 10 and a shaft 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a gear rotation transmission device having a structure in which a gear is rotatably supported on a shaft.

(Prior Art) For example, as one of the drive devices provided in a facsimile machine to rotate a conveyance roller that conveys a transmission document, there is a gear rotation transmission device having the following configuration. This gear rotation transmission device is assembled into a unit and attached to the main body of the facsimile machine. That is, shafts are integrally formed at a plurality of locations on a base made of synthetic resin, and wheels made of synthetic resin are rotatably supported on each of these shafts, so that adjacent gears are meshed with each other. Each gear has a shaft hole in the center, and the shaft of the base body is inserted into the shaft hole and is rotatably supported.

Then, attach the base to the main body of the facsimile machine, and fit the ends of each shaft formed on the base into bearings formed on the frame of the main body of the device, so that the gears supported on each shaft do not come out from the ends of the shafts. That's what I do. Further, a motor is attached to the base body, and a gear fixed to an output shaft of the motor is meshed with a gear in the first stage of the gear train.

This gear rotation transmission device drives a motor attached to the base to rotate the gear on the output shaft, then transmits the rotation to the gear in the first stage of the gear train that meshes with the gear on the output shaft, and then sequentially at each stage. The gear rotates and the rotation is transmitted to the conveyance roller.

However, since this gear rotation transmission device has a structure in which the gear is rotatably supported on a shaft formed on the base body, there are problems described below.

In other words, in a structure in which the axis of the base body and the shaft hole of the gear are combined, the error in the axis of the base body and the error in the shaft hole of the gear, which occur during the manufacturing of the base body and gears, combine to cause the outer circumferential surface of the shaft of the base body to The inner circumferential surface of the shaft hole of the gear does not come into uniform contact with the inner peripheral surface of the gear shaft hole, resulting in an uneven contact state, and a so-called looseness occurs between the two. When the gear rotates in this state, the gear is stably supported by the shaft of the base body and cannot rotate, but instead rotates in an unstable supported state.

For this reason, when the gear rotates, it vibrates in the radial direction, causing the inner peripheral surface of the shaft hole to hit the outer peripheral surface of the base shaft, or the teeth to hit the teeth of the adjacent gear. May generate noise.

As a countermeasure to this problem, the precision in manufacturing the base body and gears is increased to reduce manufacturing errors in the shaft holes of the base body and gears to be combined.

However, in order to increase the precision in manufacturing the base body and gears, higher precision equipment must be used and the number of steps required for manufacturing increases, resulting in higher manufacturing costs.

It is also conceivable to integrally mold the gear and the shaft from synthetic resin, but in this case as well, the mold would be large and the manufacturing cost would increase significantly.

Therefore, a configuration can be considered in which a coil spring is fitted to each shaft of the base body, and the gear supported on each shaft is suppressed and supported from the side to suppress vibration of the gear during rotation. With this configuration, there is no burden on manufacturing and there is no increase in manufacturing costs.

However, this configuration has a problem in that the number of parts is large and the assembly work is very troublesome because the coil springs are individually fitted to the plurality of shafts formed on the base body.

(Problem to be Solved by the Invention) In the conventional gear rotation transmission device that employs a structure in which the shaft of the base body and the shaft hole of the gear are combined in this way, due to manufacturing errors, the shaft of the base body and the shaft hole of the gear are Since the support of the gear by the base body is unstable due to lack of uniform contact, the gear may vibrate in the radial direction and generate vibrations when the gear rotates.

If this countermeasure is taken in terms of manufacturing, the manufacturing cost will increase, and if a configuration is adopted in which coil springs are provided on each axis of the base body to hold down the gears, assembly work will become troublesome.

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a gear rotation transmission device that suppresses radial vibration of the gear when it rotates and alleviates noise generation by economical means. .

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the gear rotation transmission device of the present invention includes a pair of shaft support members arranged with a gap between them, and a shaft support member of the shaft support members. a plurality of shafts supported between a plurality of shafts, a plurality of gears rotatably provided on each of these shafts and meshing with each other to transmit rotation; and a plurality of gears disposed on the shaft support member and in contact with a side surface of the gears. The gear holding part is characterized by comprising gear holding members each formed at a position corresponding to a plurality of gears.

The gear holding part of the gear holding member preferably has a configuration that surrounds a shaft that supports the gear and presses the center of the side surface of the gear.

(Function) According to this configuration, the gear holding part formed on the gear holding member presses the side surface of the gear and holds the gear from the side, so the gear and the shaft do not come into uniform contact due to manufacturing errors and the shaft Even if the support of the gear is unstable, vibrations in the radial direction when the gear rotates can be suppressed and noise generation can be alleviated.

Since the gear holding member is integrally formed with a plurality of gear holding parts corresponding to the plurality of gears, multiple gears can be held down by setting one gear holding member on the shaft support member. This makes it possible to reduce the number of members that hold down the gears, and to simplify the assembly work of setting these members.

In particular, if the gear holding part of the gear holding member is configured to surround the shaft that supports the gear and press the center of the side surface of the gear, the gear can be pressed while minimizing loss of rotational torque of the gear.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment of the gear rotation transmission device of the present invention. The gear rotation transmission device of this example is
This is applied to a device that rotationally drives a document conveyance roller in a facsimile machine. In this embodiment, the gear rotation transmission device is mounted as a unit on the main body frame of the facsimile machine.

In the figure, reference numeral 1 denotes a plate-shaped base made of synthetic resin, and this base 1 is attached to a body frame 17 of a facsimile machine at a predetermined distance.

A motor 2 is mounted on one side of the base 1.
The output shaft 3 of this motor 2 passes through the base 1 and extends to the other side, and a gear 4 is attached thereto.

A round shaft 5.6 is integrally formed on the other side of the base 1 at a predetermined interval on a straight line passing through the output shaft 3 of the motor 2. It is formed to extend for a predetermined length in a direction perpendicular to the plate surface.

One shaft 5 has a gear 4 attached to the output shaft 3 of the motor 2.
A gear 7 meshing with the gear 7 and a gear 8 having a smaller diameter than the gear 7 are rotatably supported side by side. These gears 7
．． Reference numeral 8 is integrally formed of synthetic resin, and a shaft hole 9 is formed passing through the center in the axial direction. The gear 7 is rotatably supported by inserting the shaft 5 into the shaft hole 9 from its tip. A gear 10 that meshes with the gear 8 is rotatably supported on the other shaft 6. This gear 10 is formed of a synthetic resin member, and has a shaft hole 11 extending axially through the center thereof. The gear 10 is rotatably supported by inserting the shaft 6 into the shaft hole 11 from its tip.

A gear holding member 12 for holding down the gear 8 and the gear 10 is arranged on the other side of the base 1. The gear holding member 12 is in the shape of a leaf spring made of synthetic resin or metal, and has a gear holding part 13 for holding down the gear 8 and a gear holding part 14 for holding down the gear 10, which are continuously formed integrally.

This gear holding part 13.14 is attached to the shaft 5 on the side of the gear 8.10.
．． A hole 1 that has a contact portion, for example triangular in shape, that contacts the inner circumference surrounding the shaft 5.
5.16 is formed.

Each peripheral edge of the contact portion has a peripheral edge portion that abuts the side surface of the base 1 and is bent obliquely. Each gear holding part 13
．． 14 has an elastic force that presses the gear 8.10 from the side as a whole due to the combination of these contact portions and peripheral portions. As described above, the gear holding member 12 of this embodiment is capable of holding two gears by integrally forming two gear holding parts.

Bearings 18 and 19 face the tip of the shaft 5 and 6 with the base 1 attached to the main body frame 17 made of synthetic resin.
are formed respectively, and when the base 1 is attached to the main body frame, the tip of the shaft 5.6 is connected to the bearing 18.1 of the main body frame.
9 is fitted.

When assembling the gear rotation transmission device configured in this way, first the gear holding portion 1 formed on the gear holding member 12 is assembled.
The shaft 5.6 of the base 1 is passed through the hole 15.16 of 3.14, and the gear holding member 12 is placed against the other side of the base 1. In this case, the peripheral edge of each gear holding part 13 , 14 of the gear holding member 12 comes into contact with the other side surface of the base body 1 . Next, the shaft 5 of the base body 1 is passed through the shaft hole 9, and the gear 7.8 is rotatably supported by the shaft 5. A contact portion of the gear holding portion 13 of the gear holding member 12 comes into contact with the inner peripheral portion of the side surface of the gear 8 . A gear 10 is rotatably supported by a shaft 6 through a shaft hole 11 through a shaft 6 of a base body 1. A gear holding part 1 of a gear holding member 12 is attached to the inner circumference of the side surface of the gear 10.
4 contact parts make contact.

In this state, the base body 1 is moved to the body frame 17 by appropriate means.
and attach the tip of the shaft 5.6 of the base 1 to the main body frame 17.
Fit into bearings 18 and 19 formed in . This allows axis 5
．． 6 is closed and gears 7.8 and 10 are connected to shaft 5.6.
There will be no withdrawal from 6.

Here, the gear holding part 13 of the gear holding member 12 presses down the side surface of the gear 8 of the gear 7.8 supported on the shaft 5, and applies elastic force from the side. The gear 7.8 is pressed by the gear holding part 13, and the side surface of the gear 7 is formed into the bearing 1 on the main body frame 17.
It corresponds to the end face of 8.

Therefore, the gears 7.8 receive elastic force from the gear holding part 13 of the gear holding member 12, and are held down from the sides by the gear holding part 13 and the bearing 18.

The gear holding portion 14 of the gear holding member 12 presses one side of the gear 10 supported on the shaft 6 and applies elastic force from the side.

The gear 10 is pressed by the gear holding portion 14, and the other side surface of the gear 10 hits the end surface of a bearing 19 formed on the main body frame 17. Therefore, the gears 7, 8, 10 receive elastic force from the gear holding part 14 of the gear holding member 12, and are held down from the sides by the gear holding part 13 and the bearing 18.

Therefore, the elastic force that the gear holding part 13.14 of the gear holding member 12 acts on the gear 7.8 and the gear 10 minimizes the loss of rotational torque of the gear and suppresses the radial vibration when the gear rotates. Set it to a size that can be held down as much as possible.

Furthermore, the contact portions of the gear holding parts 13 and 14 of the gear holding member 12 are configured to hold down the inner peripheries of the side surfaces of the gears 8 and 10, so that the loss of rotational torque during rotation of the gears can be suppressed to the smallest possible range.

By assembling in this manner, it is possible to simultaneously hold down both the gear 5.6 and the gear 10 by simply setting one gear holding member 12 on the base body 1.

Note that the gear 10 meshes with a gear 20 attached to a support (not shown) provided on the main body frame 17.

When the motor 2 is driven to rotate the output shaft 3 in order to transmit rotation, the rotation is transmitted from the gear 4 to the gear 7, and the gear 8 rotates together with the gear 7. The gear 7.8 is supported on the shaft 5 and rotates.

The rotation of gear 8 is transmitted to gear 10, which is supported by shaft 6 and rotates.

Note that the rotation of gear 10 is transmitted to gear 20.

Thus, the gears 7.8 are pressed and supported by the gear holding portion 13 of the gear holding member 12 under elastic force.

Therefore, due to manufacturing errors between the gear 7.8 and the shaft 5, the contact between the inner peripheral surface of the shaft hole 9 and the outer peripheral surface of the shaft 5 becomes uneven.
Even if the gear 7.8 is not stably supported by the shaft 5 and rotates in an unstable supported state, the radial vibration of the gear 7.8 can be sufficiently suppressed to prevent the generation of noise caused by the vibration.

The gear 10 is compressed and supported by a gear holding portion 14 of a gear holding member 12 under elastic force.

Therefore, due to manufacturing errors between the gear 10 and the shaft 6, the contact between the inner circumferential surface of the shaft hole 11 and the outer circumferential surface of the shaft 6 becomes uneven, and the gear 1
Even when the gear 10 is not stably supported by the shaft 5 and rotates in an unstable supported state, the radial vibration of the gear 10 can be sufficiently suppressed to prevent the generation of noise accompanying the vibration.

Further, in this gear rotation transmission device, the structure of the member that holds down the gear is simple, and the number of parts is small, making it very economical.

The configuration of the gear holding member 12 is not limited to the above-described embodiment, and other configurations may be adopted, for example, as shown in FIG. 4. In short, it is sufficient that a plurality of gear holding parts are integrally formed.

Further, in the embodiment, the gear holding member 12 is provided only on the base body 1 side, but the present invention is not limited to this, and the structure may be such that it is also provided on the main body frame 17 and the gear holding member 12 holds down the gear from both sides.

The gear rotation transmission device of the present invention is not limited to the applications of the embodiments, but can be widely applied to various applications.

[Effects of the Invention] As explained above, according to the gear rotation transmission device of the present invention, by using a gear holding member having a plurality of gear holding parts, it is possible to set a member for suppressing gear vibration on a plurality of gears. can be easily carried out, the assembly work is simple, and the gear retaining member can suppress vibrations in the radial direction of the gear when the gear rotates, thereby alleviating the generation of noise.

[Brief Description of the Drawings] Figures 1 to 3 show one embodiment of the present invention, in which Figure 1 is a side view of the gear rotation transmission device, Figure 2 is a plan view with the gears removed, and Figure 3 is a side view of the gear rotation transmission device. The figure is a plan view showing a gear provided therein, and FIG. 4 is a diagram showing another example of a gear holding member. 1...Base (shaft support member) 2...Motor, 3...
・Output shaft, 4...gear, 5.6...shaft, 7.8゜1
0... Gear, 9, 11... Shaft hole, 12... Gear holding member, 13.14... Gear holding part, 17... Main body frame (shaft supporting member).

Claims (2)

[Claims] (1) A pair of shaft support members spaced apart from each other, a plurality of shafts supported between the shaft support members, and a shaft that is rotatably provided on each of these shafts and meshes with each other to transmit rotation. a plurality of gears, and a gear holding member, which is arranged on the shaft support member and has gear holding parts formed at positions corresponding to the plurality of gears, each having a gear holding part having elasticity that contacts a side surface of the gear and presses the gear. A gear rotation transmission device comprising: (2) The gear rotation transmission device according to claim 1, wherein the gear holding part of the gear holding member presses the inner circumference of the side surface of the gear surrounding the shaft that supports the gear.