JPS61286652A - Transmission - Google Patents

Abstract

PURPOSE:To realize a small-sized and inexpensive transmission by connecting each revolution transmission element having different outer diameter onto an eccentric shaft through an Oldham's coupling in rotatable ways and selectively taking out the revolution from one among the revolution transmission elements. CONSTITUTION:An eccentric shaft 3 consists of a large-diameter part 3a, middle- diameter part 3b, and a small-diameter part 3c, and a large-diameter gear 4a is rotatably fitted onto the large-diameter part 3a, and a middle-diameter gear 4b is fitted onto the middle-diameter part 3b, and a small-diameter gear 4c is fitted onto the small-diameter part 3c. Further,the first Oldham's coupling 5a is interposed between the large-diameter gear 4a and the middle-diameter gear 4b, and the second Oldham's coupling 5b is interposed between the middle- diameter gear 4b and the small-diameter gear 4c. A transmission gear 11 on the trailing side spline shaft 10 installed in parallel to the eccentric shaft 3 selectively meshes with each gear 4a, 4b, 4c, and a driving side gear 12 meshes with the large-diameter gear 4a at all times.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a transmission device using an Oldham coupling, and is applicable as a transmission mechanism of a so-called variable magnification device that changes the moving speed of a document table or optical system of a copying machine, for example. The present invention relates to a preferred transmission device used.

``Prior Art'' Conventionally, many transmission devices that use a clutch have been used to change the moving speed of, for example, the document table or optical system of a copying machine in accordance with a magnification ratio.

The transmission shown in FIG. 6 is an example of one used in such a copying machine, and has C1*C2+C3+C4.
are each a clutch. In this case, chain sprocket B attached to shaft a is the rotation input member, chain sprocket C is the output side, and clutch C,
Gear G that comes into contact with and leaves clutch C3, and gear G that comes into contact with and leaves clutch C3.
3 are each rotatably attached to the shaft a.

Also, a gear G2 that engages and disengages from the clutch C2 attached to an axis e parallel to the axis a, and a gear G that engages and disengages from the clutch C4.
, are each rotatably fitted on the shaft e.

Furthermore, gears G 1 ′ + G 3 ′ are fixed to the shaft a, and gears G 2 ′ + G 4 ′ are respectively fixed to the shaft e.
The gear 04' meshes with a gear Gs that is integral with the chain sprocket C on the output side.

Therefore, for example, when clutch C7 is turned on and disk D and gear G1 are integrated, the rotation transmitted to shaft a via chain sprocket b on the input side is transmitted from disk D via gear Gl, Gear 02' that meshes with this
This gear G2' is transmitted to the chain sprocket C on the output side via the shaft e to which the gear G2' is fixed. The signal is transmitted via the chain to the document table and optical system installed in the copying machine body, causing them to run at a constant speed.

On the other hand, when, for example, the clutch C2 is turned on while the clutch C8 is turned off, the disk D of the clutch C2 becomes integrated with the gear G2 provided on the shaft e. Therefore,
The rotation transmitted from chain sprocket b to shaft e is
Gear G,',G,.

It is transmitted to the shaft e via the disk D2, and is further transmitted to the gear G4',
It is transmitted to chain sprocket C via G5.

Similarly, by independently turning on and off the clutches c31c, the gears C, C, which are engaged with each other,
/ and C2, C direct and G2' + G3 and G+', G,
By adjusting the ratio of the number of teeth between ' and G1, four speed ratios can be secured.

``Problems with the Prior Art'' The transmission device for ensuring the variable magnification ratio in conventional copying machines was constructed as described above, so each clutch was required to obtain one transmission ratio, and many gears were required. As a result, the equipment became larger and the cost increase could not be suppressed.

``Object of the Invention'' Accordingly, an object of the present invention is to provide a small and inexpensive transmission device that can be used in copying machines and other devices as described above.

"Structure of the Invention" In order to achieve the above object, the main means adopted by the present invention is to rotatably attach the rotation transmission elements to which the rotation is transmitted via the Oldham joint to the eccentric shaft, and to attach each rotation transmission element to the eccentric shaft. The present invention relates to a transmission device that is configured with gears or friction wheels having different outer diameters, and that inputs rotation to one of the rotation transmission elements and selectively outputs rotation from one of the rotation transmission elements.

"Embodiments" Next, embodiments embodying the present invention will be described with reference to FIGS. 1 to 5 to provide an understanding of the present invention. Here,
FIG. 1(a) is a perspective view of a transmission according to an embodiment of the present invention, FIG. 1(b) is a schematic configuration diagram showing the meshing state of gears in the transmission, and FIG. 2 is a partially exploded perspective view of the transmission shown in a), FIG. FIG. 4 is a schematic diagram showing the meshing state of the gears and ranks of the transmission shown, and shows a six-stage transmission according to an embodiment of the present invention, and FIG.
) is a side sectional view thereof, FIG. 5(b) is a schematic diagram showing the meshing state of gears, FIG. Figure 1 (b) is a schematic diagram showing the meshing state of gears, Figure TI! J(C)
FIG. 2 is a front view showing a locking mechanism of the transmission.

The following examples are merely specific examples of the present invention, and are not intended to limit the technical scope of the present invention.

What is shown in FIG. 1 is a three-stage transmission according to an embodiment of the present invention. In FIG. , a large diameter section 3&, a medium diameter section 3, and a small diameter section 3c.

A large-diameter gear 41 is rotatably fitted in the large-diameter portion 31, a medium-diameter gear 4i in the medium-diameter portion 3I, and a small-diameter gear 4c in the small-diameter portion 3e. A first Oldham joint 5□ that transmits the rotation of the large-diameter gear 4□ to the medium-diameter gear 4I is interposed between the large-diameter gear 41 and the medium-diameter gear 4B. A second Oldham joint 5I is interposed between the small diameter gear 4e and the small diameter gear 4e.

First Oldham joint 5. As shown in FIG. 1(C), it is ring-shaped and has a radial protrusion 6° on one side and a protrusion 6I perpendicular to the protrusion 61 on the opposite side. Further, the large diameter gear 41 is connected to the first Oldham joint 51.
a concave groove 7 into which the protrusion 6° is slidably fitted; is formed, and the other medium diameter gear 4 is connected to the first Oldham joint 5. The surface facing the second Oldham joint 5 has a concave groove 8° into which the protrusion 6b is slidably inserted. The protrusions formed on the other side are fitted into the grooves 8 and 91 formed on one side of the small diameter gear. In addition, the groove 8
1 and 81 may be formed at an angle of <90 degrees as shown in FIG. 1(C), or may be formed parallel to each other.

Furthermore, in the case of this embodiment, a driven side spline shaft 10 is arranged parallel to the eccentric shaft 3, and a transmission gear 11 that is spline-fitted to this is attached. This transmission gear 11
can be slid along the spline shaft 1G as shown by the two-dot chain line in FIG. The eccentricity of the eccentric shaft 3 and the diameter of each gear are determined so that they can mesh with each other.

12 is a large diameter gear 4. This is a gear on the drive side that constantly meshes with the

Therefore, the rotation of the gear 12 on the drive side is controlled by the large diameter gear 4m.
As shown in FIG. 4(a), large diameter gear 4. When the large diameter gear 4 and the transmission gear 11 are in mesh with each other, the large diameter gear 4
．． rotation is transmitted to the spline shaft 10 via the transmission gear 11, and the spline shaft lO is connected to the large diameter gear 4. and transmission gear 11
It rotates at a rotational speed according to the ratio of the number of teeth. The spline shaft IO is connected to the document table and other driven objects, and these driven objects are driven at a speed corresponding to the speed ratio. Then, when the transmission gear 11 is moved along the spline axis lO from the position shown by the solid line in FIG. I2 is rotated by large diameter gear 41. The signal is transmitted to the transmission gear 11 that meshes with the first Oldham joint 5□ and the medium-diameter gear 4b, and the spline shaft lO rotates according to the ratio of the number of teeth between the medium-diameter gear 4b and the transmission gear 11.

First Oldham joint 5. As is well known (the rotation of the large-diameter gear 41, which is an example of a rotation transmission element provided on both sides thereof, is directly transmitted to the medium-diameter gear 4t, the medium-diameter gear 4t is rotated at the same speed as the large-diameter gear 4t). Because it rotates at speed,
The spline shaft 1G is a gear (4 m) that the transmission gear 11 meshes with.
, 4'b or 4c).

In the embodiment shown in FIG.
The speed is changed by sliding the transmission gear 11 that alternately meshes with the small diameter gear 4c, but by sliding the Oldham coupling and the group of gears connected thereto together with the eccentric shaft 3, the gear on the other side The speed can be changed by changing the meshing position with the shaft and the rank.The one shown in FIG. The eccentric shaft 3 is slidably attached to the support shaft 1.
3 in the axial direction, the gear (large diameter gear 41, medium diameter gear 4, small diameter gear 4c) that engages with the rack 15 provided on the lower surface of the document table 14 can be selected. be.

16 is a handle for sliding the eccentric shaft 3 in its axial direction. In addition, in order to ensure smooth engagement between the rack 15 and each gear, in this embodiment, as shown in FIG. In close contact with each other.

In the embodiment described above, there are three gears of different diameters, 4 m and 4 m.
Three gear ratios can be obtained depending on which gear b, 4c and transmission gear 11 or rack 15 are engaged, but it is possible to obtain even more gear ratios by combining these mechanisms. be.

For example, in the example shown in FIG. 4, two eccentric shafts 3L and 3'' are provided in parallel with the spline shaft 10, and one eccentric shaft 3L has a large diameter gear leM, a medium diameter gear 17b, and a small diameter gear. 17e via Oldham joints 18m and 18b, and other eccentric 6-shafts 3. has a large diameter gear 191. Oldham coupling 20* for medium diameter gear 19 and small diameter gear 19c
, 20b, the driving gear 12 is engaged with the intermediate gear 21 and the small diameter gear 19c, which are integrated with the small diameter gear 17c, and the transmission gear 11 attached to the spline shaft 10 is connected to each of the gears 17m, 17b, 17e, 19m
, 19b, and 19c, the spline shaft 10 can be rotated based on six types of gear ratios.

In this embodiment, the drive gear 12 is always meshed with both the intermediate gear 21 and the small diameter gear 190, but for example, the drive gear 12 is meshed only with the intermediate gear 21, and also separately from the transmission gear 11. One transmission gear 11. is attached to the spline shaft 10, and the sliding position of each transmission gear is selected so that one of these intermediate gears 11 and Lla meshes with the gear on the eccentric shaft 31 side, and the other meshes with the gear on the eccentric shaft 3j side. By doing so, the number of rotations taken out from the gear of the eccentric shaft 3J may be changed in nine steps.

In the embodiments described above, various gear ratios are obtained by changing the engagement of the gears by sliding each gear in a direction parallel to the eccentric shaft. The gear shown in FIG. 5 is different from this in that the engagement of the gears can be changed by rotating the eccentric shaft 23 as indicated by an arrow 24.

That is, the eccentric shaft 23 has, as shown in FIG. 945(a),
First gear 251. The second gear 25I, third gear 25c, and fourth gear 25J are connected via Oldham couplings 26□, 26+, and 26c located between them.

1st gear 25. A drive gear (not shown) is engaged with the drive gear. Further, a driven wheel 27' parallel to the eccentric shaft 23 has a small diameter gear 271 which meshes with the second gear 25- when the eccentric shaft 23 is rotated as shown by the arrow 24. 3rd gear 25
A transmission gear 27 that integrally includes a medium diameter gear 27c that meshes with the fourth gear 25j and a large diameter gear 27c that meshes with the fourth gear 25j is fixed.

In the state shown in FIGS. 5(a) and 5(b), the large diameter gear 27
The gears 27c and 25a are shown to be in mesh with each other, but when the eccentric shaft 23 is rotated by 120 degrees, the gears 27c and 25a are disengaged, and instead of this, the third gear 2
5c and the medium-diameter gear 27 are engaged with each other, and when the shaft is further rotated by 120 degrees, the engagement between the gears 271 and 25c is disengaged, and the small-diameter gear 27□ and the second gear 25I are newly engaged with each other. The edge diameter of the gear and the amount of eccentricity of the eccentric shaft 23 are determined.

Note that the first gear 25. , the first gear 25□ must be kept in mesh with the drive gear even when the eccentric shaft 23 is rotated, so the first gear 25□ is located at the center of rotation 2B of the eccentric shaft 23.
It is attached to an eccentric shaft 23 so as to be rotatable about the center.

Note that it is necessary to lock the eccentric shaft 23 at a constant rotational angle position, and for this purpose, as shown in FIGS. 5(a) and (c).
As shown in , the shaft end 23. of the eccentric shaft 23. 1 on the outer peripheral surface of
Cuts 11t29 are formed every 20 degrees, and the leaf spring 3 is inserted into the cuts 11t29.
0 is engaged to lock the eccentric shaft 23 at the engaged position.

31 is a knob for rotating the eccentric shaft 23.

32 in the figure. is the rotation center axis of the fourth gear 25-, and its axis is 321'. Also, 321. is centered on the axis 32I,'. The central axis of rotation of the third gear 25c, 32c, is the central axis of rotation of the second gear 25t, which is centered around the axis 32c'.

Therefore, when the knob 31 is rotated, the eccentric shaft 23 rotates around its central axis 28, and the eccentric shaft 23 rotates around the rotation axis 28 by 120 degrees.
Each rotation center axis 32 &, 32 provided at angles of degrees
b, 32c alternately approach and move away from the driven shaft 2γ', and the second to fourth shafts provided on the respective rotation center shafts
25 gears.

By meshing and disengaging 25c and 25a with the small diameter gear 27□, medium diameter gear 27, and small diameter gear 27e of the corresponding transmission gear 27, three stages of gear ratios are achieved according to the ratio of the number of teeth. It's something you can wander around.

In the above description, the rotation transmission element constituted by a gear was explained, but this may be replaced by, for example, a wear wheel or the like.

"Effects of the Invention" As described above, the present invention has the following advantages: Rotation transmission elements that are rotationally transmitted through Oldham joints are rotatably attached to eccentric shafts, and each rotation transmission element is connected to gears or friction wheels having different outer diameters. This is a transmission device that inputs rotation to one of the rotation transmission elements and selectively outputs rotation from either of the rotation transmission elements, so even when the gear ratio is set in multiple stages, the device can be easily operated. Since it can be miniaturized and constructed using only a simple Oldham coupling and gears, it significantly contributes to miniaturization of the equipment and cost reduction.

[Brief explanation of drawings]

FIG. 1(a) is a side view of a transmission according to an embodiment of the present invention, FIG. 1(b) is a schematic configuration diagram showing the meshing state of gears in the transmission, and FIG. 2 is a partially exploded perspective view of the transmission shown in a), FIG. FIG. 4 is a schematic diagram showing the meshing state of gears and racks of the transmission shown, and shows a six-stage transmission according to an embodiment of the present invention, and FIG.
) is a side sectional view thereof, FIG. 5(b) is a schematic diagram showing the meshing state of gears, FIG. Fig. 6(b) is a schematic diagram showing the gear meshing state, Fig. 6(c) is a front view showing the locking mechanism of the transmission, and Fig. 6 shows the transmission of the document table in a conventional copying machine. FIG. (Explanation of symbols) 3.23...Eccentric shaft 5m, 5b, 20.26...Oldham joint 11.27
...Transmission gear 14...Document table 15...Rack.

Claims (2)

[Claims] (1) Rotation transmission elements to which rotation is transmitted via the Oldham joint are rotatably attached to eccentric shafts, and each rotation transmission element is configured with gears or friction wheels with different outer diameters, and each rotation transmission element is connected to one of the rotation transmission elements. A transmission that inputs rotation and selectively outputs rotation from one of the rotation transmission elements. (2) The transmission device according to claim 1, wherein the output side of the transmission device is connected to a document table or an optical system of a copying machine.