JP2003278872A - Reciprocating motion mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the reciprocating motion mechanism wherein certain operation is obtained by a simple structure. <P>SOLUTION: This reciprocating motion mechanism is provided with a worm 10 that is a driver composing of a rotor and a slider 20 that is the follower reciprocated by the rotation of this driver 10, and the first contact section 21 that stops rotating the driver 10 when this follower 20 comes to the start edge section of follower driving and the second contact section 22 that contacts with the driver 10 and stops rotating the driver 10 when the follower 20 comes to the stop edge section of follower driving are provided with the follower 20 itself. The follower 20 can also compose of a bevel gear. The driver and the follower can also composed of a male screw and a female nut. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating mechanism. For example, the present invention relates to a reciprocating mechanism including a worm and a rack, a male screw and a female screw, and the like. 2. Description of the Related Art Generally, a reciprocating mechanism having a driving body composed of a rotating body and a driven body reciprocating by the rotation of the driving body includes, for example, a worm and a rack, a male screw and a female screw, and the like. Is known. In this type of reciprocating mechanism, it is usual to provide a stopper that comes into contact with the driven body (for example, a rack) in order to regulate the moving range of the driven body. [0003] In the above-mentioned conventional reciprocating mechanism, a stopper which comes into contact with the driven body is provided in order to regulate the moving range of the driven body. there were. [0004] 1. When the driven body abuts on the stopper and its movement is restricted, the rotating body as the driving body still tries to rotate, so that the engaging portion (engaging portion) between the driven body and the driven body bites. In some cases, malfunctions (such as the drive body cannot be reversed) may occur. [0005] 2. The above problem can be solved by providing a torque limiter or the like in a drive system path of the driving body and stopping a further rotation when a certain load is applied to the driving body. is there. However, in this case, it is necessary to provide a torque limiter or the like which is not necessary for the reciprocating motion. [0006] 3. In addition, 1. The problem is that the stopper is not provided, and instead, when the driven body comes to its driven start end, the engagement (engagement) with the driving body is released, and the driven body is attached to its driven end. It is configured such that when it comes, the engagement with the driving body is released (that is, the engagement with the driving body is released at both end positions in the reciprocating motion of the driven body and the driving body is not driven any more). To solve the problem). However,
In this case, after the driven body comes to the driven start end or driven end and is disengaged from the driving body, a means for enabling the driven body to be engaged again is required. FIG. FIG. 6 is a diagram showing an example of a reciprocating mechanism with the configuration of FIG. In the drawing, reference numeral 1 denotes a worm (a driving body composed of a rotating body), and 2 denotes a slider (a driven body) that reciprocates by the rotation of the worm 1. The slider 2 is integrally provided with a rack 2 a that meshes with the worm 1.
Reference numeral 3 denotes a motor, and a pinion 3a fixed to an output shaft of the motor 3 is meshed with a gear 1b fixed to a shaft 1a of the worm 1, whereby the worm 1 is driven to rotate, and according to the rotation direction. The slider 2 slides (follows) in the direction of the arrow X1 or X2. In this mechanism, no stopper is provided to abut the slider 2 to directly regulate the movement range thereof, and the slider 2 moves in the direction of the arrow X1 as indicated by the imaginary line to move the rack 2a.
When the rack 2a comes off the other end 1d of the worm 1, the movement of the slider 2 stops. When the rack 2a comes off the other end 1d of the worm 1, the movement of the slider 2 stops. Stop (the state shown by the solid line in FIG. 7). However, with such a configuration,
When the slider 2 (follower) comes to its driven start end (position indicated by a solid line in FIG. 7) or driven end (position completely moved in the direction of the arrow X1 as indicated by a virtual line), engagement with the worm 1 is started. After being disengaged, a means for enabling the engagement with the worm 1 again is required. In the mechanism shown in FIG. 7, a leaf spring 4 is provided as a means for this. The leaf spring 4 is fixed to the frame 5 of this mechanism, and its both ends 4a, 4b
Faces the moving trajectory of the protrusion 2b provided on the slider 2. Therefore, the position of the slider 2
Slides in the direction of arrow X1, before the engagement between the rack 2a and the worm 1 is released, the protrusion 2b abuts on one end 4a of the leaf spring 4 and moves further while flexing the same. When the engagement is released, the projection 2b is
Is bent as shown by a virtual line.
Thereafter, when the worm 1 reverses, one end 4a of the leaf spring 4 is
The rack 2a meshes with the worm 1 and the slider 2 slides in the direction of the arrow X2. The same operation is performed at the end of the slide in the direction of arrow X2. Before the engagement between the rack 2a and the worm 1 is released, the protrusion 2b abuts on the other end 4b of the leaf spring 4 to bend it. When the engagement with the worm 1 is released, the protruding portion 2b bends the other end 4b of the leaf spring 4 as shown by a solid line. Thereafter, when the worm 1 rotates forward, the rack 2a meshes with the worm 1 by the urging force of the other end 4b of the leaf spring 4, and the slider 2
It will slide in one direction. As is apparent from the above, according to such a mechanism, the moving range of the slider 2 can be defined without providing a stopper, so that the bite between the worm 1 and the rack 2a can be prevented. it can. However, in this mechanism, since the driving body 1 and the driven body 2 repeatedly engage and disengage, the operation tends to be unstable. In addition, since the driven body 2 must be moved near the end of its movement against the urging force of the urging means, there is also a problem that an unnecessarily large motor 3 is required. It is an object of the present invention to provide a reciprocating mechanism capable of solving all of the above problems and achieving a reliable operation with a simple structure. According to a first aspect of the present invention, there is provided a reciprocating mechanism comprising: a driving body comprising a rotating body; and a driven body reciprocating by the rotation of the driving body. A mechanism provided with: a first contact portion for stopping the rotation of the driven body by coming into contact with the driven body when the driven body comes to its driven start end; A second contact portion is provided to stop the rotation of the driving body by coming into contact with the driving body when reaching the driven end portion. According to a first aspect of the present invention, there is provided a reciprocating mechanism comprising a driving body comprising a rotating body and a driven body which reciprocates by the rotation of the driving body. A first contact portion for stopping the rotation of the driven body by contacting the driven body when the driven body reaches the driven start end; and the driving body when the driven body comes to the driven end end. According to the reciprocating mechanism according to the first aspect, the following operation and effect can be obtained. (A) The driven member itself has a first contact portion and a second contact portion that stop the rotation of the driven member by coming into contact with the driven member when the driven member reaches the driven start end portion or the driven terminal end portion. When the driven body comes to the driven start end or the driven end, the rotation of the rotating body, which is the driving body, is stopped. For this reason, the engaging portion between the driving body and the driven body does not bite. Therefore, operation failure (the drive body cannot be reversed, etc.) does not occur. (B) By the operation of (a), it is not necessary to provide a torque limiter or the like which is originally unnecessary for the reciprocating motion, and the structure is simplified. (C) Since there is no need to release the engagement with the driving body when the driven body reaches its driven start end or driven end, there is no need for a means for enabling the rotating body to be engaged again. Become. As a result, stable operation is obtained, and an unnecessarily large motor is not required. As described above, according to the reciprocating mechanism according to the first aspect, a reliable operation can be obtained with a simple configuration. In addition, the size of the motor as the driving source can be reduced. Embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> FIGS. 1A and 1B show a first embodiment of a reciprocating mechanism according to the present invention, wherein FIG.
(B) is a partially omitted bb enlarged sectional view in FIG. (A). 2 (a) is a front view, and FIG. 2 (b) is a partially omitted bb enlarged sectional view in FIG. 2 (a). As shown in these figures, the reciprocating mechanism includes a worm 10 as a driving body composed of a rotating body,
A slider 20 as a driven body that reciprocates by the rotation of the worm 10 is provided. The slider 23 is integrally provided with a rack 23 that meshes with the worm 10. Reference numeral 30 denotes a motor, and a pinion 31 fixed to an output shaft of the motor 30 meshes with a gear 14 fixed to the shaft 13 of the worm 10 so that the worm 10
Is driven to rotate, and the slider 20 slides (follows) in the arrow X1 or X2 direction according to the rotation direction. The frame 50 of this mechanism includes a slider 2
A guide (not shown) for guiding the zero reciprocation is provided. At both ends of the worm 10, first projections 1 are provided.
While the first and second projections 12 are provided integrally,
When the slider 20 reaches the driven start end as shown in FIG. 1A, the slider 20 comes into contact with the first projection 11 of the worm 10 as shown in FIG.
The first contact portion 21 for stopping the rotation of the worm 10 and the second projection 12 of the worm 10 as shown in FIG. 2B when the slider 20 comes to the driven end as shown in FIG. And a second contact portion 22 that stops rotation of the worm 10 by contact with the worm 10. Therefore, the reciprocating mechanism operates as follows. When the worm 10 is rotated in the direction of arrow L in FIG. 1B by driving the motor 30 from the state shown in FIG. 1, the slider 20 slides in the direction of arrow X1 in FIG. When the slider 20 reaches the slide end position as shown in FIG.
As shown in (b), when the second protrusion 12 of the worm 10 contacts the second contact portion 22 of the slider 20, the rotation itself of the worm 10 in the direction of the arrow L is stopped. Will also stop in the direction of arrow X1. Conversely, when the worm 10 is rotated in the direction of arrow R in FIG. 2B by driving the motor 30 from the state shown in FIG.
Slide in the direction. Then, the slider 20 is moved to the position shown in FIG.
As shown in FIG.
(A) As shown in (b), the first projection 1 of the worm 10 is formed.
The rotation of the worm 10 in the direction of the arrow R is stopped by the contact of the slider 1 with the first contact portion 21 of the slider 20, and as a result, the movement of the slider 20 in the direction of the arrow X2 also stops. The reciprocating mechanism described above is a mechanism including a driving body 10 composed of a rotating body and a driven body 20 which reciprocates by the rotation of the driving body 10. When the driven body 20 reaches its driven start end (see FIG. 1), a first contact portion 21 that comes into contact with the driving body 10 to stop the rotation of the driving body 10, and the driven body 20 has its driven terminal end. (See FIG. 2), the second abutting portion 22 is provided to abut against the driving body 10 to stop the rotation of the driving body 10. Therefore, according to this reciprocating mechanism, Such an operation and effect can be obtained. (A) When the driven body 20 comes to its driven start end or driven end, the driven body 20 itself comes into contact with the driving body 10 to stop the rotation of the driving body 10, and the first abutting portion 21 and the 2
Since the contact portion 22 is provided, when the driven body 20 comes to the driven start end or driven end, the rotation itself of the rotating body 10 as the driving body is stopped. For this reason, the engaging portion (meshing portion) between the driving body 10 and the driven body 20 does not bite. Therefore, operation failure (the drive body cannot be reversed, etc.) does not occur. (B) By the operation of (a), it is not necessary to provide a torque limiter or the like which is originally unnecessary for the reciprocating motion, and the structure is simplified. (C) It is not necessary to release the engagement (engagement) with the driving body 10 when the driven body 20 reaches its driven start end or driven end, so that the engagement with the rotating body 10 is enabled again. For this purpose, there is no need for any means (for example, the leaf spring 4 shown in FIG. 7). As a result, stable operation is obtained, and an unnecessarily large motor is not required. As described above, according to this reciprocating mechanism, reliable operation can be obtained with a simple configuration. In addition, the size of the motor 30 as a driving source can be reduced. <Example of use> The reciprocating mechanism as described above is
For example, it can be used for a color image forming apparatus as shown in FIG. This image forming apparatus is an apparatus capable of forming a full-color image on both sides of a sheet, and includes a case 100, an image carrier unit 120 housed in the case 100, and an exposure unit 13 as an exposure unit.
0, a developing unit 140 as a developing unit, and an intermediate transfer unit 150. The image carrier unit 20 includes a photoconductor (image carrier) 121 having a photosensitive layer on the outer peripheral surface thereof,
And a charging unit (not shown) for uniformly charging the outer peripheral surface of the photosensitive member 121. The outer peripheral surface of the photoreceptor 121 uniformly charged by the charging unit is selectively exposed to laser light from the exposure unit 130. Exposure is performed to form an electrostatic latent image, and a toner as a developer is applied to the electrostatic latent image by a developing unit 140 to form a visible image (toner image). Transfer body (intermediate transfer belt) 15
1 is primary-transferred by a primary transfer unit T1, and further secondary-transferred to a transfer target sheet by a secondary transfer unit T2. In the case 100, the secondary transfer portion T2
The conveyance path 116 conveys the sheet on which an image is formed on one side toward the sheet discharge section (discharge tray section) 115 on the upper surface of the case 100, and the sheet discharge section 1 by the conveyance path 116.
There is provided a return path 117 for returning the sheet conveyed toward 15 to the secondary transfer portion T2 in order to switch back the sheet and form an image on the other side. Case 100
A paper feed tray 1 for holding a plurality of sheets in a stack
And a paper feed roller 119 for feeding the paper one by one toward the secondary transfer portion T2. The developing unit 140 is a rotary developing device, and a developing unit cartridge 142Y for yellow, a developing unit cartridge 142M for magenta, a developing unit cartridge 142C for cyan, and a main body 141 which is a rotating body. 142K black developer cartridge
Is provided, and the main body 141 is 90 & de in the direction of the arrow.
g; By rotating at the pitch, the surface of the photoconductor 121 can be selectively developed. The photosensitive member 121,
While a driving mechanism for the intermediate transfer unit 150 and the developing unit 140, a high-voltage contact for applying a bias, and the like are arranged, a developing device cartridge 142 (Y) as shown by a virtual line in FIG. , M, C, K) are provided.
Each developing unit cartridge 142 (Y, M, C, K) can be attached to and detached from the main body 141 by being inserted and removed from 0. The intermediate transfer unit 150 includes a driving roller 154, a driven roller 155, a primary transfer roller 156, and a primary transfer unit T rotatably supported by a frame (not shown).
1, a guide roller 157 for stabilizing the state of the intermediate transfer belt 151 and a tension roller 158.
And an intermediate transfer belt 151 stretched around these rollers, and the belt 151 is driven to circulate in the direction of the arrow in the figure. Photoconductor 121 and primary transfer roller 1
56, the primary transfer portion T1 is formed, and the secondary transfer portion T2 is formed at a pressure contact portion between the drive roller 154 and the secondary transfer roller 100b provided on the main body side. The secondary transfer roller 100b is capable of coming into contact with and separating from the drive roller 154 (and thus to the intermediate transfer belt 151).
Is formed. Therefore, when a color image is formed, a plurality of color toner images are superimposed on the intermediate transfer belt 151 in a state where the secondary transfer roller 100b is separated from the intermediate transfer belt 151 to form a color image. , The secondary transfer roller 10b is connected to the intermediate transfer belt 5
1, and the image is transferred onto the sheet by supplying the sheet to the contact portion (secondary transfer portion T <b> 2). For example, the rotary developing device 14 as described above
In the color image forming apparatus using the image forming apparatus 0, each developing device cartridge 142 detachably attached to the rotating body 141.
(Y, M, C, K) information (for example, the color, capacity, remaining amount of toner contained in the cartridge,
It is desirable that the date of manufacture can be read by the image forming apparatus main body. The reciprocating mechanism described above is used as a reading mechanism as follows. As shown in FIG. 4, each developing device cartridge 142 (Y,
The connector 143 (Y, M, C, K) having a built-in memory in which the above information is recorded is provided on the front surface of the case of M, C, K).
K) is attached. On the other hand, a connector 24 (see FIGS. 1 and 2) connectable to the connector 143 is attached to the tip of the slider 20 of the reciprocating mechanism described above. Therefore, as shown in FIGS. 3 and 4, the reciprocation is performed in a state where the connector 143 of a certain developing device cartridge 142 (in the case of FIG. By operating the movement mechanism to move the slider 20 in the direction of arrow X1, the two connectors 143 and 24 can be connected to each other. Conversely, by sliding the slider 20 in the direction of arrow X2, the two connectors 143 and 243 can be connected.
24 can be disconnected. <Second Embodiment> FIG. 5 is a view showing a reciprocating mechanism according to a second embodiment of the present invention.
It is a figure corresponding to the partially omitted bb enlarged sectional view in (a). In the figure, the same or corresponding portions as those in the first embodiment are denoted by the same reference numerals. The difference between this embodiment and the first embodiment is that the first projection 11 and the second
The protrusion 12 is connected to the first contact portion 21 of the slider 20 or the second
As shown in the drawing, when it comes into contact with the contact portion 22, the elastic member is elastically deformed to store elastic energy, and the other points are the same. Although the first protrusion 11 and the first contact portion 21 are illustrated in FIG. 5, the second protrusion 12 is similarly deformed. With this configuration, the worm 10
Reverses (when it rotates in the direction of arrow L in the figure),
Since the elastic energy stored in the first protrusion 11 (or the second protrusion 12) acts as an assisting force against the reverse rotation of the worm 10, a smoother reverse rotation operation of the worm 10 is obtained. <Second Embodiment> FIG. 6 shows a reciprocating mechanism according to a third embodiment of the present invention. In the figure, the same or corresponding portions as those in the first embodiment are denoted by the same reference numerals. This embodiment is different from the above-described first embodiment in that the follower is constituted by a bevel gear 25 meshing with the worm 10 instead of the slider 20, and the first and second contact portions are formed. One of the constituent contact portions 26 is provided integrally with the bevel gear 25, and the other points remain the same. This reciprocating mechanism operates as follows. From the state shown in FIG.
When the worm 10 is rotated in the direction of arrow R by the drive of
The bevel gear 25 rotates in the direction of arrow R1 in FIG. When the helical gear 25 reaches the rotation end position (also the rotation start position) as shown in FIG. (B), the first projection 11 of the worm 10 is moved to the helical gear as shown in FIG. The worm 10 comes in contact with the contact portion 26 of the worm 10.
Is stopped in the direction of arrow R, and as a result, the rotation of the bevel gear 25 in the direction of arrow R1 is also stopped. Conversely, when the worm 10 is rotated in the direction of arrow L in FIG. 2B by driving the motor 30 from the state shown in FIG.
Rotate in the direction. Then, when the bevel gear 25 reaches the rotation end position as shown in FIG. (C), the second protrusion 12 of the worm 10 comes into contact with the contact part 26 of the bevel gear 25 as shown in FIG. By the contact, the rotation itself of the worm 10 in the direction of the arrow L is stopped, and as a result, the movement of the bevel gear 25 in the direction of the arrow L1 is also stopped. Therefore,
According to this embodiment, the same operation and effect as those of the first embodiment can be obtained. In addition, by configuring the first protrusion 11 and the second protrusion 12 with an elastic body as in the second embodiment, the same operation and effect as those of the second embodiment can be obtained. Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified within the scope of the present invention. For example, the driving body and the driven body may be configured by a male screw and a female screw. According to the reciprocating mechanism according to the first aspect,
Reliable operation can be obtained with a simple configuration. In addition, the drive source can be downsized. [0029]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a first embodiment of a reciprocating motion mechanism according to the present invention, wherein (a) is a schematic front view, and (b) is a partly omitted b in FIG. -B expanded sectional view. 2 (a) is a front view, and FIG. 2 (b) is a partially omitted bb enlarged sectional view in FIG. 2 (a). FIG. 3 is a diagram showing a usage example. FIG. 4 is a partially enlarged view of FIG. 3; FIG. 5 is a view showing a second embodiment of the reciprocating mechanism according to the present invention, and is a view corresponding to a partially omitted bb enlarged sectional view in FIG. 1A. FIGS. 6A, 6B and 6C are views showing a third embodiment of a reciprocating mechanism according to the present invention. FIG. 7 is an explanatory diagram of a conventional technique. [Description of Signs] 10 Worm (Driver) 20 Slider (Follower) 21 First Contact Part 22 Second Contact Part 25 Bevel Gear (Follower) 26 First and Second Contact Part

Claims (1)

Claims 1. A mechanism comprising a driving body composed of a rotating body and a driven body that reciprocates by the rotation of the driving body.
A first contact portion for stopping the rotation of the driven body by contacting the driven body when the driven body comes to its driven start end, and a driven body having come to its driven end end; A reciprocating mechanism, wherein a second contact portion is provided for stopping the rotation of the driving body by contacting the driving body.